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Preprint ARTICLE | doi:10.20944/preprints202406.0043.v1

A Proposal to Change the Leap-Second Adjustments to UTC

Judah Levine

Subject: Physical Sciences, Atomic And Molecular Physics Keywords: Coordinated Universal Time; Leap seconds; UT1; UTC

Online: 3 June 2024 (08:01:18 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202406.1287.v1

SE-CBAM-YOLOv7: An Improved Lightweight Attention Mechanism-Based YOLOv7 for Real-Time Detection of Small Aircraft Targets in Microsatellite Remote Sensing Imaging

Zhenping Kang, Yurong Liao, Shuhan Du, Haonan Li, Zhaoming Li

Subject: Engineering, Aerospace Engineering Keywords: aircraft detection; YOLOv7; CBAM; SENet; microsatellite

Online: 18 June 2024 (15:09:54 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201703.0090.v1

Design and Imaging of Ground-Based Multiple-Input Multiple-Output Synthetic Aperture Radar (MIMO SAR) with Non-Collinear Arrays

Cheng Hu, Jingyang Wang, Weiming Tian, Tao Zeng, Rui Wang

Subject: Engineering, Electrical And Electronic Engineering Keywords: MIMO radar; MIMO imaging; Near-field imaging; Height difference between T/R arrays; Grating lobes

Online: 15 March 2017 (00:48:12 CET)

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Preprint ARTICLE | doi:10.20944/preprints202409.1134.v1

The Mother's Day Solar Storm of 11 May 2024 and Its Effect on Earth's Radiation Belts

Viviane Pierrard, Alexandre Winant, Edith Botek, Maximilien Péters de Bonhome

Subject: Physical Sciences, Space Science Keywords: geomagnetic storm; solar energetic particles; solar event; radiation belts; energetic protons; relativistic electrons

Online: 14 September 2024 (10:38:34 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202403.0069.v1

An Attitude Adaptive Integral Sliding Mode Control Algorithm with Feedforward Compensation Disturbance Observer for Microsatellites to Track High-Speed Moving Targets

Xinyan Yang, Lei Li, Yurong Liao, Zhaoming Li

Subject: Engineering, Aerospace Engineering Keywords: Microsatellite; Attitude Control; Moving Target Tracking; Disturbance Observer; Sliding Mode Control

Online: 1 March 2024 (18:25:20 CET)

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Preprint ARTICLE | doi:10.20944/preprints202210.0336.v1

Does Time Smoothen Space? Implications for Space-Time Representation

Neil Sang

Subject: Environmental And Earth Sciences, Other Keywords: Discreteness; Topology; Space-Time Representation; Epistemology; Face Centered Cubic Packing

Online: 21 October 2022 (11:38:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202403.0117.v2

Emergence of Time from Primordial Space and Expansion of Space with Time

Eckhard Rebhan

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: space-time; generic space expansion; emergence of time; dark energy; quantum grav-ity; Wheeler-de Witt-equation; volume quantisation; friction by information transfer; information quantum

Online: 28 May 2024 (14:26:25 CEST)

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A model of space-time is presented, whose origin is set before the appearance of any universe. It uses concepts of previous work, a central one being that the information about the laws of nature is stored locally everywhere in space such that all physical processes obey them. Since information storage is bound to matter or energy, space is assumed to consist of dark energy (DE), which thus assumes an importance far beyond its function as a stopgap for an energy deficit in our universe ( U ). The primordial state (PS) is a timeless and relatively large space of 3 dimensions described by a Wheeler DeWitt (WDW) equation, whose solution is interpreted as an arrangement of very many space quanta and possesses properties that remind of the time-honored concept of the unmoved mover. The comparison of WDW solutions belonging to different mass densities of the DE favors one in which the space quanta are mini black holes. This allows the space quanta to be imagined as mass points which are kept at a distance compatible with the quantum volume by the Pauli principle or something equivalent. Triggered by a dramatic increase in probability, the PS is followed by a time-controlled sequence of quantized expansion states (ES i ). The concomitant emergence of time occurs in a lightning huge crash, consuming almost all DE of the PS. The subsequent quantized ES i emerge from a WDW equation, novelly derived from a solution of the modified cosmic momentum equation, which classically describes an exponential space expansion (CS). The huge volme of the ES i is also used as size of the PS. Information is assumed to be geometrically stored in arrangements of space quanta similar to how genetic information is stored in DNA molecules. During the CS information must be transferred from already existing "information quanta" to new ones. This requires time, slows down the expansion and is taken into account by a friction term in the cosmological momentum equation thus modified. Since the Friedmann-Lemaître (FL) equation remains fully valid, the model is widely based on recognized equations, so that some results may be understood as interpretations.

Preprint ARTICLE | doi:10.20944/preprints202407.0113.v1

Geomagnetic Field Measurements based Adaptive Cubature H-infinity Filter for Microsatellite Autonomous Orbit Estimation

Zhaoming Li, Xinyan Yang, Lei Li, Yurong Liao

Subject: Engineering, Aerospace Engineering Keywords: autonomous orbit estimation; microsatellite; cubature Kalman filter; robust; geomagnetic field

Online: 1 July 2024 (13:54:09 CEST)

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Preprint REVIEW | doi:10.20944/preprints202208.0347.v1

The Uncertainty Principle and the Minimal Space-Time Length Element

David Escors, And Grazyna Kochan

Subject: Physical Sciences, Quantum Science And Technology Keywords: General relativity; uncertainty principle; geodesics; black hole singularity; quantum gravity; Planck star; Lorentz invariance violations.

Online: 18 August 2022 (11:06:06 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.1215.v1

Evaluating the VIIRS Imagery for Developing Near Real-Time Nationwide Vegetation Cover Monitoring in Indonesia

Yudi Setiawan, Kustiyo Kustiyo, Sahid Agustian Hudjimartsu, Judin Purwanto, Riva Rovani, Anna Tosiani, Basyiruddin Usman, Tatik Kartika, Novie Indriasari, Lilik Budi Prasetyo, Belinda Arunarwati Margono

Subject: Environmental And Earth Sciences, Remote Sensing Keywords: change detection; temporal vegetation dynamics; open area index; multi temporal VIIRS

Online: 18 April 2024 (10:57:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202405.1876.v1

Assessment of Particulate Organic Carbon in the Mediterranean Sea Based on Dual-Optimization Random Forest

Chao Li, Huisheng Wu, Chaojun Yang, Long Cui, Ziyue Ma, Lejie Wang

Subject: Environmental And Earth Sciences, Remote Sensing Keywords: particle organic carbon; Mediterranean; machine learning; tuneRanger R package; geographic detector

Online: 28 May 2024 (14:28:22 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201911.0340.v1

A Large Scene Deceptive Jamming Method for Space-Borne SAR based on Time-Delay and Frequency-Shift with Template Segmentation

Kaizhi Yang, Wei Ye, Fangfang Ma, Guojing Li, Qian Tong

Subject: Engineering, Electrical And Electronic Engineering Keywords: synthetic aperture radar (sar); space-borne sar; deceptive jamming

Online: 27 November 2019 (09:49:31 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0809.v5

Elementary Particles and Their Interaction with Space-Time Curvature

Eran Magshim Lavi

Subject: Physical Sciences, Particle And Field Physics Keywords: elementary particles; space-time; spacetime curvature; relativity; charges; TOE

Online: 16 August 2024 (04:48:29 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202309.1002.v5

Dark Energy and Dark Matter from Extra Dimensional Symmetry as Different Manifestations of Vacuum Energy

Kabir Umar

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: dark energy; dark matter; extra dimension; gravity; neutrino; vacuum energy

Online: 21 May 2024 (17:22:12 CEST)

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Preprint COMMUNICATION | doi:10.20944/preprints202311.0250.v1

Beyond Deep Learning—Space, Time, and Emergence

Ge Wang, Feng-Lei Fan

Subject: Computer Science And Mathematics, Artificial Intelligence And Machine Learning Keywords: Artificial neural network; deep network; wide network; intra-layer links; Hopfield network; diffusion model; representation engineering; emergent properties; AI agents; netware engineering

Online: 3 November 2023 (11:44:39 CET)

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Preprint ARTICLE | doi:10.20944/preprints202112.0522.v1

Analysis of a Relaxation Process Caused by the Load Variation Adapted on the Basis of Second Order Electrical Model

Guzel Nikishina, Evgeny Denisov

Subject: Engineering, Electrical And Electronic Engineering Keywords: lithium battery; electrochemical power sources; diagnostics; battery management system; load variation; in situ method

Online: 31 December 2021 (12:59:15 CET)

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Preprint ARTICLE | doi:10.20944/preprints201609.0088.v1

Multi-range Conditional Random Field for Classifying Railway Electrification System Objects

Jaewook Jung, Leihan Chen, Gunho Sohn, Chao Luo, Jong-Un Won

Subject: Engineering, Civil Engineering Keywords: classification; railway; power line; mobile laser scanning data; conditional random field; layout compatibility

Online: 26 September 2016 (09:33:05 CEST)

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Railway has been used as one of the most crucial means of transportation in public mobility and economic development. For efficiently operating railways, the electrification system in railway infrastructure, which supplies electric power to trains, is essential facilities for stable train operation. Due to its important role, the electrification system needs to be rigorously and regularly inspected and managed. This paper presents a supervised learning method to classify Mobile Laser Scanning (MLS) data into ten target classes representing overhead wires, movable brackets and poles, which are recognized key objects in the electrification system. In general, the layout of railway electrification system shows a strong regularity of spatial relations among object classes. The proposed classifier is developed based on Conditional Random Field (CRF), which characterizes not only labeling homogeneity at short range, but also the layout compatibility between different object classes at long range in the probabilistic graphical model. This multi-range CRF model consists of a unary term and three pairwise contextual terms. In order to gain computational efficiency, MLS point clouds is converted into a set of line segments where the labeling process is applied. Support Vector Machine (SVM) is used as a local classifier considering only node features for producing the unary potentials of CRF model. As the short-range pairwise contextual term, Potts model is applied to enforce a local smoothness in short-range graph. While, long-range pairwise potentials are designed to enhance spatial regularities of both horizontal and vertical layouts among railway objects. We formulate two long-range pairwise potentials as the log posterior probability obtained by Naïve Bayes classifier. The directional layout compatibilities are characterized in probability look-up tables which represent co-occurrence rate of spatial relations in horizontal and vertical directions. The likelihood function is formulated by multivariate Gaussian distributions. In the proposed multi-range CRF model, the weight parameters to balance four sub-terms are estimated by applying the Stochastic Gradient Descent (SGD). The results show that the proposed multi-range CRF can effectively classify detailed railway elements, representing the average recall of 97.66% and the average precision of 97.07% for all classes.

Preprint ARTICLE | doi:10.20944/preprints202402.0890.v1

Characterization of Industrial High-Strength Aluminum Alloys by Laser-Induced Breakdown Spectroscopy, With Special Emphasis on the Detection of Low Contents of Mg, Mn, Cr, Cu, Zn and Sensing of Molecular Diatomic Emission of AlO During Ablation

Svetlana Rytchkova, Luc Lévesque

Subject: Physical Sciences, Optics And Photonics Keywords: Laser-induced breakdown spectroscopy (LIBS); Aluminum (Al); Magnesium (Mg); Manganese (Mn); Chromium (Cr); Copper (Cu); Zinc (Zn); Aluminum Monoxide (AlO).

Online: 16 February 2024 (07:01:12 CET)

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Preprint ARTICLE | doi:10.20944/preprints202405.2089.v1

The Entropy of the Collapsing Molecular Cloud

Gemechu Muleta Kumssa

Subject: Physical Sciences, Space Science Keywords: Entropy; Gravity; Turbulence; Molecular cloud; Star formation

Online: 31 May 2024 (08:10:11 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202407.1383.v1

A Peak Finding Siamese Convolutional Neural Network (PF-SCNN) for Aero-engine Hot Jet FT-IR Spectrum Classification

Shuhan Du, Wei Han, Zhenping Kang, Fengkun Luo, Yurong Liao, Zhaoming Li

Subject: Engineering, Aerospace Engineering Keywords: infrared spectrum detection; FT-IR; aero-engine hot jet; siamese convolutional neural network networks; peak finding

Online: 17 July 2024 (13:41:29 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202406.1279.v1

CWT-AM-CNN: A Lightweight Feature Extraction Network with Attention Mechanism Based on CWT Peak Seeking Method for Aero-Engine Hot Jet FT-IR Classification

Shuhan Du, Wei Han, Zhenping Kang, Xiangning Lu, Yurong Liao, Zhaoming Li

Subject: Engineering, Aerospace Engineering Keywords: Infrared Spectral detection; FT-IR; Aero-engine hot jet; deep learning; Attention Mechanism

Online: 20 June 2024 (12:51:20 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202406.0062.v1

Development and Testing of a Smart Ice Control System Using Machine Learning Models

Dario Farina, Hatim Machrafi, Patrick Queeckers, Patrice Desire Dongo, Carlo Saverio Iorio

Subject: Computer Science And Mathematics, Artificial Intelligence And Machine Learning Keywords: aerospace icing prevention; risk mitigation in aviation; graphene-based sensors; dynamic ice sensing; de-icing; conductive polymer applications; smart sensors; pedot:pss polymers; 2D materials; micromachines

Online: 3 June 2024 (10:41:17 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202103.0709.v1

Uplink IoT Networks: Time-Division Priority-Based Non-Orthogonal Multiple Access Approach

Basem M. Elhalawany, Ahmad A.Aziz El-Banna, Kaishun Wu, Wali Ullah Khan

Subject: Engineering, Automotive Engineering Keywords: non-orthogonal multiple access; priority-ordering; spectrum sharing; time-division

Online: 29 March 2021 (16:57:37 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201908.0039.v1

Multi-Band Frequency Window for Time-Frequency Fault Diagnosis of Induction Machines

Jordi Burriel-Valencia, Ruben Puche-Panadero, Javier Martinez-Roman, Angel Sapena-Bano, Martin Riera-Guasp, Manuel Pineda-Sanchez

Subject: Engineering, Electrical And Electronic Engineering Keywords: fault diagnosis; induction motors; wind energy generation; fourier transforms; spectral 16 analysis; spectrogram; transient regime

Online: 5 August 2019 (03:56:26 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202406.0839.v1

Lifetime of Long-Lived Sunspot Groups

Judit Muraközy

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Solar physics; Sunspots; Sunspot groups; Sunspot cycle; Solar magnetic fields; Solar active region magnetic fields

Online: 12 June 2024 (12:21:17 CEST)

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Working Paper ARTICLE

On a Duality between Time and Space Cones

Waleed Al-qallaf, Kyriakos Papadopoulos

Subject: Computer Science And Mathematics, Geometry And Topology Keywords: causality; chronology; chorology; Minkowski space; time cone; space cone; weak interval topology; duality

Online: 24 May 2019 (08:22:25 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.2044.v1

Evaluation of Solid Phase Joining Using Friction Stir Welding Technique between Aluminum 6061 and Polymer-Based Composites

NOUMAN ALI, Zain ul Abadeen, Yumna Qureshi

Subject: Chemistry And Materials Science, Other Keywords: FSW (Friction Stir Welding); IMc (Intermetallic Compounds); UTM (Universal Testing Machine); RPM (Revolutions Per Minute); HAZ (Heat Affected Zone); WZ (Weld Zone); BM (Base Metal); CNC (Computer Numeric Control); EDM (Electrical Discharge Machine)

Online: 29 August 2024 (16:58:20 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.0030.v1

Surface Ages in the Vicinity of the Chang’e-6 Landing Site

Li Zhang, Jianzhong Liu, Gregory Michael, Ping Ge, Kaichang Di, Congzhe Wu, Kai Zhu, Xiaoxi Kang

Subject: Environmental And Earth Sciences, Geophysics And Geology Keywords: Chang’ e-6; CSFD measurements; absolute model age; Apollo basin

Online: 2 September 2024 (08:54:01 CEST)

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Preprint REVIEW | doi:10.20944/preprints201811.0080.v1

Health as a Space-Time Continuum

Anatolii Gozhenko, Viktor Biryukov, Olena Gozhenko, Walery Zukow

Subject: Medicine And Pharmacology, Other Keywords: space-time continuum; the theory reliability of complex systems; integrated assessment of health; redundancy of functions; risk management

Online: 5 November 2018 (03:35:11 CET)

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Preprint ARTICLE | doi:10.20944/preprints201809.0371.v1

Dynamic Path in C⁴ Space-Time

Dimitris Mastoridis, K. Kalogirou

Subject: Physical Sciences, Mathematical Physics Keywords: dynamic path; ADM formalism; complex space-time; extended space-time; unied theories; geometric unication

Online: 19 September 2018 (08:30:15 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201809.0369.v1

Field Equations in C⁴ Space-Time

Dimitris Mastoridis, K. Kalogirou

Subject: Physical Sciences, Mathematical Physics Keywords: general relativity; geometric unication; dark matter-energy; mass geometrisation; complex space-time; symplectic space-time; extended space-time

Online: 19 September 2018 (08:21:48 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202406.1582.v1

Progressive Inter-path Interference Cancellation Algorithm for Channel Estimation Using OTFS

Mauro Marchese, Henk Wymeersch, Paolo Spallaccini, Pietro Savazzi

Subject: Computer Science And Mathematics, Signal Processing Keywords: OTFS; channel estimation; (DD) delay-Doppler domain; fractional parameter estimation; Inter-Path Interference

Online: 24 June 2024 (10:07:09 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202307.0099.v1

Research on an Intra-Pulse Orthogonal Waveform and Methods Resisting Interrupted-Sampling Repeater Jamming within the Same Frequency Band

Huahua Dai, Yingxiao Zhao, Hanning Su, Zhuang Wang, Qinglong Bao, Jiameng Pan

Subject: Engineering, Electrical And Electronic Engineering Keywords: anti-interference; interrupted-sampling repeater jamming; intra-pulse orthogonal waveform; characteristics of continuity

Online: 4 July 2023 (03:40:19 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202307.1376.v2

Deflection of Null and Time-like Geodesics in Topological Defects Space-Time Geometry

Faizuddin Ahmed, Abdul Kayum, Monjur Alom Choudhury, Mahmudul Hassan

Subject: Physical Sciences, Theoretical Physics Keywords: Topological defects; Gravitational lensing

Online: 25 July 2023 (03:39:09 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202407.0928.v1

Transmission Spectroscopy Along the Transit of Venus: A Proxy for Exoplanets Atmospheric Characterization

Alexandre Baptista Branco, Pedro Machado, Olivier Demangeon, Sarah Amelia Jaeggli, Thomas Widemann, Paolo Tanga

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Venus; Solar Transit; High-resolution transmission spectroscopy; Radiative transfer; Cross-correlation; Carbon dioxide; Carbon monoxide; Ozone; Venus-like exoplanets

Online: 11 July 2024 (08:37:43 CEST)

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Preprint HYPOTHESIS | doi:10.20944/preprints202401.1983.v1

Matter Is the Representation of Space-Time

Xiaohan Deng, Zhiyong Deng

Subject: Physical Sciences, Theoretical Physics Keywords: Space-time group; Space-time entanglement; Quantization of space-time; Dark matter and dark energy; CPT Symmetry

Online: 29 January 2024 (08:46:34 CET)

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Preprint ARTICLE | doi:10.20944/preprints202309.0445.v1

Antigravity in the Six Dimensional Space-Time

seyed kazem mousavi

Subject: Physical Sciences, Applied Physics Keywords: antigravity; electromagnetic; six dimensional space-time

Online: 7 September 2023 (02:49:43 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202003.0453.v1

Theory of Spinors in Curved Space-Time

Ying-Qiu Gu

Subject: Physical Sciences, Quantum Science And Technology Keywords: Clifford algebra; tetrad; spinor connection; natural coordinate system; energy-momentum tensor; local Lorentz transformation; spin-gravity interaction

Online: 31 March 2020 (10:03:22 CEST)

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The interaction between spinors and gravity is the most complicated and subtle interaction in the universe, which involves the basic problem to unified quantum theory and general relativity. By means of Clifford Algebra, a unified language and tool to describe the rules of nature, this paper systematically discusses the dynamics and properties of spinor fields in curved space-time, such as the decomposition of the spinor connection, the classical approximation of Dirac equation, the energy momentum tensor of spinors and so on. To split spinor connection into Keller connection $\Upsilon_\mu\in\Lambda^1$ and pseudo-vector potential $\Omega_\mu\in\Lambda^3$ by Clifford algebra not only makes the calculation simpler, but also highlights their different physical meanings. The representation of the new spinor connection is dependent only on the metric, but not on the Dirac matrix. Keller connection only corresponds to geometric calculations, but the potential $\Omega_\mu$ has dynamical effects, which couples with the spin of a spinor and may be the origin of the celestial magnetic field. Only in the new form of connection can we clearly define the classical concepts for the spinor field and then derive its complete classical dynamics, that is, Newton's second law of particles. To study the interaction between space-time and fermion, we need an explicit form of the energy-momentum tensor of spinor fields. However, the energy-momentum tensor is closely related to the tetrad, and the tetrad cannot be uniquely determined by the metric. This uncertainty increases the difficulty of deriving rigorous expression. In this paper, through a specific representation of tetrad, we derive the concrete energy-momentum tensor and its classical approximation. In the derivation of energy-momentum tensor, we obtain a spinor coefficient table $S^{\mu\nu}_{ab}$, which plays an important role in the interaction between spinor and gravity. From this paper we find that, Clifford algebra has irreplaceable advantages in the study of geometry and physics.

Preprint ARTICLE | doi:10.20944/preprints202408.1366.v1

Pore Characteristics of Hydrate-Bearing Sediments from Krishna-Godavari Basin, Offshore India

Wen Guan, Hailin Yang, Xindi Lu, Hailong Lu

Subject: Environmental And Earth Sciences, Oceanography Keywords: hydrate-bearing sediments; microporous structure; Krishna-Godavari Basin; pore characterization

Online: 20 August 2024 (03:39:46 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202405.0039.v1

Water Recuperation from Regolith at Martian, Lunar & Micro-gravity during Parabolic Flight

Dario Farina, Hatim Machrafi, Patrick Queeckers, Christophe Minetti, Carlo Saverio Iorio

Subject: Engineering, Aerospace Engineering Keywords: regolith hydration; water extraction technologies; parabolic flight simulation; ice-regolith interaction; substrate condensation efficiency; in-situ resource utilization (ISRU); thermal condensation processes; micro-gravity experiments; surface properties and water recovery; space resources; space mining

Online: 1 May 2024 (09:56:06 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0321.v2

OculusGraphy: Signal Analysis of the Electroretinogram in a Rabbit Model of Endophthalmitis Using Discrete and Continuous Wavelet Transforms

Aleksei Zhdanov, Paul Constable, Sultan Mohammad Manjur, Anton Dolganov, Hugo F. Posada-Quintero, Aleksander Lizunov

Subject: Computer Science And Mathematics, Signal Processing Keywords: biomedical research; electroretinography; electroretinogram; ERG; electrophysiology

Online: 19 May 2023 (07:16:55 CEST)

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Preprint CASE REPORT | doi:10.20944/preprints202403.0899.v1

A Study on the Factors for the Occurrence of Vacant Homes in Medium Cities and Characteristics of Each Types – Focusing on Asan City, Chungcheongnam-Do

Jeonghyeon Choi, Seung-Seok Han, Myung-je Woo

Subject: Social Sciences, Urban Studies And Planning Keywords: vacant home; poisson; negative binomial regression; spatial regression

Online: 15 March 2024 (07:48:10 CET)

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Preprint REVIEW | doi:10.20944/preprints202002.0300.v1

Monitoring Forests in Space and Time Using Close-Range Sensing

Mikko Vastaranta, Ninni Saarinen, Tuomas Yrttimaa, Ville Kankare, Samuli Junttila

Subject: Biology And Life Sciences, Forestry Keywords: forest change; remote sensing; natural phenomena; growth; tree health; forest operations

Online: 21 February 2020 (02:53:34 CET)

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Preprint ARTICLE | doi:10.20944/preprints202405.1792.v1

Unsupervised Characterization of Water Composition with UAV-based Hyperspectral Imaging and Generative Topographic Mapping

John Waczak, Adam Aker, Lakitha O. H. Wijeratne, Shawhin Talebi, Ashen Fernando, Prabuddha M. H. Dewage, Mazhar Iqbal, Matthew Lary, David Schaefer, Gokul Balagopal, And David J. Lary

Subject: Environmental And Earth Sciences, Environmental Science Keywords: Hyperspectral Imaging; Remote Sensing; Unsupervised Classification; Endmember Extraction; Generative Topographic Mapping

Online: 3 June 2024 (17:09:23 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202403.1444.v1

Environmental Chamber Characterization of an Ice Detection Sensor for Aviation Using Graphene and PEDOT:PSS

Dario Farina, Marco Mazio, Hatim Machrafi, Patrick Queeckers, Carlo Saverio Iorio

Subject: Engineering, Aerospace Engineering Keywords: Ice Formation; Aircraft Ice Detection; Hazard Management; Graphene Sensors; In-Flight Safety Technology; Real-time Ice Monitoring; Resistance Signal Analysis; Pedot:PSS; Climatic chamber

Online: 25 March 2024 (08:47:38 CET)

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Preprint ARTICLE | doi:10.20944/preprints202404.0210.v1

Two Dark Clouds on the Space-Time Horizon

TEJINDER P. SINGH

Subject: Physical Sciences, Particle And Field Physics Keywords: Gravitation; wide binaries; Modified Newonian Dynamics; dark matter; supraquantum nonlocal correlations; Bell's inequalities; CHSH inequality; fifth force; unification; quantum nonlocality; Popescu-Rohrlich bound

Online: 4 April 2024 (02:30:43 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202402.0913.v1

The Electric Charge Influence on Space-Time Curvature

Eran Magshim Lavi

Subject: Physical Sciences, Theoretical Physics Keywords: electric charge; spacetime curvature; relativity

Online: 19 February 2024 (10:16:40 CET)

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Preprint ESSAY | doi:10.20944/preprints202005.0320.v1

Huge Filaments as Regions of Space-Time Deformation

Irina Rozgacheva

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: cosmology; large scale structure; huge filaments; space-time deformation

Online: 20 May 2020 (06:52:32 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201809.0368.v4

C⁴ Space-Time.. A Window to New Physics?

Dimitris Mastoridis, Konstantinos Kalogirou

Subject: Physical Sciences, Mathematical Physics Keywords: extended space-time; complex space-time; unified theories; geometric unification; dark matter-energy; Cartan's principle of triality; extended general-special relativity

Online: 7 February 2020 (04:34:13 CET)

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We explore the possibility to form a physical theory in $C^4$. We argue that the expansion of our usual 4-d real space-time to a 4-d complex space-time, can serve us to describe geometrically electromagnetism and nuclear fields and unify it with gravity, in a different way that Kaluza-Klein theories do. Specifically, the electromagnetic field $A_\mu$, is included in the free geodesic equation of $C^4$. By embedding our usual 4-d real space-time in the symplectic 8-d real space-time (symplectic $R^8$ is algebraically isomorphic to $C^4$), we derive the usual geodesic equation of a charged particle in gravitational field, plus new information which is interpreted. Afterwards, we formulate and explore the extended special relativity and extended general relativity an $C^4$ or$R^8$. After embedding our usual 4-d space-time in $R^8$, two new phenomena rise naturally, that are interpreted as "dark matter" and "dark energy". A new cosmological model is presented, while the geometrical terms associated with "dark matter" and "dark energy" are investigated. Similarities, patterns and differences between "dark matter", "dark energy", ordinary matter and radiation are presented, where "dark energy" is a dynamic entity and "dark matter" reveal itself as a "mediator" betwen ordinary matter and "dark energy". Moreover, "dark matter" is deeply connected with "dark energy". Furthermore, the extended Hamilton-Jacobi equation of the extended space-time, is transformed naturally as an extended Klein-Gordon equation, in order to get in contact with quantum theories. By solving the Klein-Gordon equation analytically, we derive an eigenvalue for Higg's boson mass value at 125,173945 $Gev/c^{2}$. The extended Klein-Gordon equation, also connects Higg's boson (or vacuum) with Cosmology, due to the existence of our second "time" T (cosmological time), which serve us to connect quantum theories with Cosmology. Afterwards, in the general case, we explore the symmetries of the curved Hamilton-Jacobi equation locally, in order to investigate the consequences of a $C^4$ space-time in Standard Model. An extension to Standard Model is revealed, especially in the sector of strong nuclear field. The Stiefel manifold $SU(4)/SU(2)$ seems capable not only to describe the strong nuclear field but give us,as well, enough room to explore in the future, the possibility to explain quark confinment. Our extension, flavors firstly the unification of nuclear fields and afterwards the unification of nuclear fields with electromagnetic field. The desired grand unification, is achieved locally, through the symmetry group $GL(4,C)\simeq SO(4,4)\cap U(4)$ and we present a potential mechanism to reduce the existing particle numbers to just six. Afterwards,23 present the extended Dirac equation in $C^4$ space-time (Majorana-Weyl representation) plus a preliminary attempt to introduce a pure geometric structure for fermions. Finally, we consider a new geometric structure through n-linear forms in order to give geometric explanation for quantisation

Preprint ARTICLE | doi:10.20944/preprints201809.0374.v1

Introduction to Fermionic Structures in C⁴ Space-Time

Dimitris Mastoridis, K. Kalogirou

Subject: Physical Sciences, Space Science Keywords: unied theories; geometric unication; fermionic geometry; Cartan's principle of triality; complex space-time

Online: 19 September 2018 (08:34:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201610.0129.v1

Space-Time Characterization of Rainfall Field in Tuscany

Alessandro Mazza

Subject: Environmental And Earth Sciences, Atmospheric Science And Meteorology Keywords: rainfall; rain gauge; kriging; trend detection

Online: 31 October 2016 (01:37:36 CET)

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Preprint ARTICLE | doi:10.20944/preprints202404.1704.v1

Vision System for the Mars Sample Return Capture, Containment and Return System (CCRS)

Brent Jon Bos, David Donovan, John Capone, Chen Wang, Terra Hardwick, Dylan Bell, Yuqing Zhu, Robert Podgurski, Bashar Rizk, Ireneusz Orlowski, Rachel Edison, David Harvey, Brianna Dizzon, Lindsay Haseltine, Kristoffer Olsen, Chad Sheng, Robert Bousquet, Luan Vo, Georgi Georgiev, Kristen Washington, Michael Singer, Stefan Ioana, Anloc Le, Elena Georgieva, Michael Hackett, Michael Ravine, Michael Caplinger, Phillip Coulter, Erin Percy, Charles Torisky, Jean Lauenstein, Kaitlyn Ryder, Michael Campola, Dillon Johnstone, William J. Thomes, Richard G. Schnurr, John McCloskey, Eugenia DeMarco, Ellen Lee, Calinda Yew, Bo Yang, Mingyu Han, Bartosz Blonski

Subject: Engineering, Aerospace Engineering Keywords: Mars; cameras; sample return; space optics

Online: 26 April 2024 (09:33:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202208.0068.v1

Instantaneous Frequency Estimation of FM Signals under Gaussian and Symmetric α-Stable Noise: Deep Learning versus Time-Frequency Analysis

Huda Saleem Razzaq, Zahir M. Hussain

Subject: Engineering, Electrical And Electronic Engineering Keywords: Frequency estimation; FM; sensors; Internet of Things (IoT); software-defined radio (SDR); al-pha-stable noise; time-frequency distribution; deep learning

Online: 3 August 2022 (03:15:26 CEST)

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Preprint ESSAY | doi:10.20944/preprints202406.0603.v1

Based on the Concept of Absolute Airspace Reference System Revision and Unification of Space-Time Transformation Theory

Shandong Zhao, Yijia Zhao

Subject: Physical Sciences, Theoretical Physics Keywords: absolute airspace; Space-time transformation; Relativity ; theory; Spatiotemporal metric

Online: 11 June 2024 (08:44:09 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.2092.v1

Design and On-Orbit Performance of Ku-Band Phase-Array SAR Payload System

Wei Yan, Xiaomin Tan, Jiang Wu, Mingze Yuan, Hongxing Dang, Wujun Chang

Subject: Engineering, Aerospace Engineering Keywords: Ku band; SAR system; payload; Taijing-4(03); on-orbit; application; micro-nano; satellite

Online: 29 August 2024 (07:14:22 CEST)

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Working Paper SHORT NOTE

Orthogonal Pores and Boolean Logic

G Sampath

Subject: Biology And Life Sciences, Biology And Biotechnology Keywords: boolean logic; nanopores; logic gates; electrolytic cell; NAND gate; NOR gate

Online: 28 November 2019 (09:55:40 CET)

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Preprint ARTICLE | doi:10.20944/preprints202404.0310.v1

Experimental Procedure to Study the High Speed Orthogonal Cutting of Unidirectional GFRP

Martina Panico, Luca Boccarusso, Antonio Formisano, Giuseppe Villani, Antonio Langella

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: orthogonal cutting; composite materials; cutting forces; burr; chip morphology

Online: 4 April 2024 (15:54:52 CEST)

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Working Paper ARTICLE

Quantum Computation and Measurements from an Exotic Space-time $R^4$

Michel Planat, Raymond Aschheim, Marcelo Amaral, Klee Irwin

Subject: Computer Science And Mathematics, Geometry And Topology Keywords: Topological quantum computing; $4$-manifolds; Akbulut cork; exotic $R^4$; fundamental group; finite geometry; Cayley-Dickson algebras

Online: 18 March 2020 (16:45:55 CET)

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Preprint ARTICLE | doi:10.20944/preprints201809.0370.v1

Introduction to Quantum Field Theory in C⁴ Space-Time

Dimitris Mastoridis, K. Kalogirou

Subject: Physical Sciences, Quantum Science And Technology Keywords: unied theories; complex space-time; gauge theories; particle theory; Higg's boson; geoemetric unication

Online: 19 September 2018 (08:26:17 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.1284.v1

Robust Wideband Interference Suppression Method for GNSS Array Antenna Receiver via Hybrid Beamforming Technique

Zhenxing Xu, Qijia Dong, Shenyang Li, Fuzhan Yue, Meng Wang, Zhenghuan Xia, Xiao Chen, Shuangna Zhang, Guoji Zou, Huizheng Wang

Subject: Engineering, Aerospace Engineering Keywords: wideband interference; anti-jamming; hybrid beamforming; hybrid array; digital array

Online: 18 April 2024 (15:42:11 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202405.2062.v1

IFU Spectroscopic Study of the Planetary Nebula Abell 30: Mapping the Ionization and Kinematic Structure of the Inner Complex

Kam Ling Chan, Quentin Andrew Parker, Andreas Ritter

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Planetary nebulae; Abell 30; Integral spectroscopy; Kinematics; velocity maps; Binary system; born-again scenario; wolf rayet central star; hydrogen deficient CSPN

Online: 30 May 2024 (13:43:19 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202207.0121.v6

The Big Bang Was Not the Beginning, but a Repeating Pattern of Expansion and Contraction of Space Time

Amrit Ladhani

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: big bang and big crunch; cosmology; dark energy; dark matter; gravitational force; the cyclic universe

Online: 18 December 2023 (06:27:08 CET)

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Preprint ARTICLE | doi:10.20944/preprints202406.1264.v1

Microwave Corona Breakdown Suppression of Microstrip Coupled-Line Filter Using Lacquer Coating

Ming Ye, Shaoguang Hu, Rui Wang, Yong Zhang, Yongning He

Subject: Engineering, Electrical And Electronic Engineering Keywords: coupled-line filter; dielectric coating; microstrip circuits; microwave corona breakdown suppression ;

Online: 18 June 2024 (13:36:03 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201911.0054.v1

Orthogonal Operators: Applications, Origin and Outlook

Peter Uylings, Ton Raassen

Subject: Physical Sciences, Atomic And Molecular Physics Keywords: atomic lifetime and oscillator strength determination; theoretical modeling and computational approaches; atomic databases and related topics

Online: 6 November 2019 (05:29:59 CET)

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Preprint ARTICLE | doi:10.20944/preprints202111.0115.v1

A Topological Approach to Shrinking Higher Dimensions of Space to Observable Space-Time: Can the Dimensional Anisotropy of Space Satisfy Mach’s Principle?

Eva Deli, James F. Peters

Subject: Physical Sciences, Particle And Field Physics Keywords: Mach's principle; GR; Borsuk-Ulam theorem; topology; Page and Wootters mechanism; dimensional anisotropy

Online: 5 November 2021 (10:58:49 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0545.v1

Global Generalized Mersenne Numbers: Definition, Decomposition, and Generalized Theorems

Vladimir Pletser

Subject: Computer Science And Mathematics, Algebra And Number Theory Keywords: Mersenne numbers; Generalized Mersenne numbers; divisibility and congruence properties

Online: 9 February 2024 (10:50:56 CET)

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Preprint ARTICLE | doi:10.20944/preprints201607.0008.v1

Spectral and Polarization Signatures of Relativistic Shocks in Blazars

Markus Boettcher

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: active galaxies; blazars; jets; polarization; shock acceleration

Online: 8 July 2016 (03:03:04 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202308.0665.v1

Economic Model of Ancillary Services in Real Time for Frequency Control

Kristian Balzer, Joaquin Lazo, David Watts

Subject: Engineering, Electrical And Electronic Engineering Keywords: ancillary services; secondary frequency control; tertiary frequency control; real time operation

Online: 8 August 2023 (13:34:09 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202311.0004.v1

Quantum Space-Time Symmetries: A Principle of Minimum Group Representation

Norma SANCHEZ, Diego CIRILO-LOMBARDO

Subject: Physical Sciences, Theoretical Physics Keywords: quantum physics; space-time; symmetry; fundamental principle; minimal group representation; Metaplectic group; coherent states phase space

Online: 1 November 2023 (04:12:51 CET)

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We show that, as in the case of the principle of minimum action in classical and quantum mechanics, there exists an even more general principle in the very fundamental structure of quantum space-time: This is the principle of minimal group that allows to consistently and simultaneously obtain a natural description of the spacetime dynamics and the physical states admissible in it. The theoretical construction is based on the physical states that are average values of the generators of the Metaplectic group Mp(n) , the double covering of SL(2C) in a vector representation, with respect to the coherent states carrying the spin weight. Our main results here are: (i) There exists a connection between the dynamics given by the Metaplectic group symmetry generators and the physical states (mappings of the generators through bilinear combinations of the basic states). (ii) The ground states are coherent states of the Perelomov-Klauder type defined by the action of the Metaplectic group which divide the Hilbert space into even and odd states mutually orthogonal. They carry a spin weight 1/4 and 3/4 respectively from which, two other basic states can be formed. (iii) The physical states, mapped bilinearly with the basic 1/4 and 3/4 spin weight states, plus their symmetric and antisymmetric combinations, have spin contents s = 0, 1/2, 1, 3/2 and 2. (iv) The generators realized with the bosonic variables of the harmonic oscillator introduce a natural supersymmetry and a superspace whose line element is the geometrical Lagrangian of our model. (v) From the line element as operator level, a coherent physical state of spin 2 can be obtained and naturally related to the metric tensor. (vi) The metric tensor is naturally discretized by taking the discrete series given by the basic states (coherent states) in the n number representation, reaching the classical (continuous) space-time for n going to infinity. (vii) There emerges a relation between the eigenvalue of our coherent state metric solution and the black hole area (entropy) as A_{bh}/4 l_{p}^{2} = I alpha I relating the phase space of the metric found g_{ab} and the black hole area A_{bh} through the Planck length l_{p}^{2} and the eigenvalue I alpha I of the coherent states. As a consequence of the lowest level of the quantum discrete space-time spectrum, eg the ground state associated to n = 0 and its characteristic length, there exists a minimum entropy related to the black hole history.

Preprint ARTICLE | doi:10.20944/preprints202308.1112.v1

The General Balance in the Six Dimensional of Space-Time

seyed kazem mousavi

Subject: Physical Sciences, Theoretical Physics Keywords: six-dimensional space-time; nature of time; quantum mechanics; general relativity

Online: 16 August 2023 (03:07:48 CEST)

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Preprint CONCEPT PAPER | doi:10.20944/preprints202210.0338.v1

Fundamental Cause of Bio-Chirality - Space-Time Symmetry: Concept Review

Victor Vasilyevich Dyakin

Subject: Biology And Life Sciences, Biochemistry And Molecular Biology Keywords: bio-chirality; fundamental forces of nature; time-space symmetry; relativity; ribosomal protein synthesis; parity violation; relativity

Online: 21 October 2022 (13:13:46 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1885.v1

Modeling Signal Integrity in High-Frequency and Radio Frequency Circuits-A Comparison of Ohm’s Law Variants

Kimuya Alex

Subject: Engineering, Electrical And Electronic Engineering Keywords: High-frequency circuits; Modified Ohm’ s Law; Non-linear resistance; Electronic devices; Signal integrity; Exponential correction; Low resistance predictions; High-current predictions

Online: 27 August 2024 (13:18:05 CEST)

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High-frequency circuit performance is significantly impacted by impedance variations, particularly within the low-resistance regime. Traditional Ohm’s Law based modeling approaches often fail to accurately predict circuit behavior in these conditions, leading to design inaccuracies and potential system failures. The Standard Ohm’s Law based model’s prediction of infinite current as resistance approaches zero is physically unrealistic and hinders its application in practical scenarios. Despite the recognition of these limitations, existing models have not comprehensively addressed the complex impedance behavior observed in high-frequency circuits. To overcome these challenges, this paper introduces a modified version of the Ohm’s Law incorporating an exponential correction term. The Modified Ohm’s Law’s accuracy was evaluated through simulated experiments across a wide frequency range (1kHz to 1GHz) using various electronic components. The findings demonstrate the superior performance of the modified model in predicting currents under low-resistance and high-current conditions compared to the Standard Ohm’s Law model. By providing finite and accurate current values, the proposed model effectively mitigates the unrealistic infinite current predictions of the standard approach. The enhanced predictive capabilities of the Modified Ohm’s Law hold significant implications for high-frequency circuit design and analysis. Its application can lead to improved performance and reliability in power electronics, telecommunications, and other high-frequency systems. By incorporating non-linear impedance behavior, the model offers a more accurate representation of real-world circuit conditions. Future research should focus on refining the exponential term’s parameters to optimize the model's accuracy across a broader range of applications. Additionally, real-time implementation and hardware validation are essential to assess the model's practical utility in complex circuit environments.

Preprint REVIEW | doi:10.20944/preprints202304.0075.v1

Transcending Time and Space: A Survey Methods, Uncertainty, and Development in Human Migration Prediction

TongZheng Pu, Chongxin Huang, Jingjing Yang, Ming Huang

Subject: Social Sciences, Demography Keywords: human migration; prediction; methods; artificial intelligence; data; uncertainty

Online: 6 April 2023 (07:12:19 CEST)

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Preprint REVIEW | doi:10.20944/preprints201806.0308.v1

Irradiance Variability Quantification and Small-Scale Averaging in Space and Time: A Short Review

Gerald M. Lohmann

Subject: Environmental And Earth Sciences, Atmospheric Science And Meteorology Keywords: irradiance variability, high-resolution measurements, increment statistics

Online: 19 June 2018 (17:10:06 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202406.1725.v1

Ionosonde Measurements Comparison during an ICME- and a SIR/CIR-Driven Geomagnetic Storm over Europe

Kitti Alexandra Berényi, Loredana Perrone, Dario Sabbagh, Alessandro Ippolito, Carlo Scotto, Árpád Kis, Veronika Barta

Subject: Environmental And Earth Sciences, Space And Planetary Science Keywords: space weather; geomagnetic storms; ionosphere; ionospheric storm; ICME; SIR/CIR; ionosonde; Digisonde; rTEC; TIMED/GUVI

Online: 25 June 2024 (07:15:52 CEST)

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Preprint ESSAY | doi:10.20944/preprints201801.0060.v1

Some Potentially Strategic Considerations for the Sex-Bot Industry

Glenn W. Smith

Subject: Social Sciences, Gender And Sexuality Studies Keywords: sexually-enable robot; sex-bot

Online: 8 January 2018 (09:56:06 CET)

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Working Paper ARTICLE

Arm Motion Classification Using Time Series Analysis of the Spectrogram Frequency Envelopes

Zhengxin Zeng, Moeness Amin, Tao Shan

Subject: Engineering, Electrical And Electronic Engineering Keywords: arm motion recognition; micro-doppler signature; time series analysis; dynamic time warping; long short-term memory

Online: 16 December 2019 (11:42:44 CET)

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Preprint ARTICLE | doi:10.20944/preprints201903.0262.v1

Time Space Translation: A Confirmed Primary Axial Patterning Mechanism in Vertebrates

Antony J. Durston

Subject: Biology And Life Sciences, Anatomy And Physiology Keywords: Hox genes, Retinoids, BMP, Gastrulation, Xenopus, Timing, Time Space Translation

Online: 28 March 2019 (10:33:43 CET)

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Preprint ARTICLE | doi:10.20944/preprints202404.0998.v1

Investigation of CFRP Concrete Reinforcement Ageing Using Microwave Infrared Thermography Method (MIRT)

Barbara Szymanik, Sam Ang Keo, Franck Brachelet, Didier Defer

Subject: Engineering, Civil Engineering Keywords: Microwave thermography; carbon-fiber-reinforced polymer (CFRP); defect; ageing; modeling with COMSOL

Online: 16 April 2024 (07:36:08 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202310.0860.v1

Robust Epileptic Seizure Detection using LSTM and Feature Fusion from Compressed Time-Frequency EEG Images

Shafi Ullah Khan, Sana Ullah Jan, In Soo Koo

Subject: Engineering, Bioengineering Keywords: Artificial Intelligence; EEG; Seizure detection; Continues wavelet transform; Hybrid features

Online: 13 October 2023 (16:39:49 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202210.0358.v1

A Modified single frequency PPP method for the Positioning and Time transfer with BDS-3

Mingjun OuYang, Xiangwei Zhu, Junzhi Li, Liu Yang

Subject: Environmental And Earth Sciences, Space And Planetary Science Keywords: BDS-3; Time transfer; Precise point positioning; Single frequency; Group and Phase Ionospheric Correction (GRAPHIC)

Online: 24 October 2022 (10:01:41 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202205.0235.v1

Dependence Structure between Bitcoin and Economic Policy Uncertainty: Evidence from Time-Frequency Quantile-Dependence Methods

Samia Nasreen, Aviral Kumar Tiwari, Zhuhua Jiang, Seong-Min Yoon

Subject: Business, Economics And Management, Economics Keywords: Bitcoin; economic policy uncertainty; spillover; wavelet coherence analysis; quantile cross-spectral dependence

Online: 18 May 2022 (03:15:25 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202108.0347.v1

A Comparative Study of Time Frequency Representation Techniques for Freeze of Gait Detection and Prediction

Tahjid Ashfaque Mostafa, Sara Soltaninejad, Tara L. McIsaac, Irene Cheng

Subject: Computer Science And Mathematics, Artificial Intelligence And Machine Learning Keywords: Parkinson’s Disease; Freeze of Gait; Deep Learning; Ensemble Learning; Wearable Sensor Data, Detection and Predication

Online: 16 August 2021 (16:48:14 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202308.1738.v1

Jeffreys Divergence and Generalized Fisher Information Measures on Fokker-Planck Space-Time Random Field

Jiaxing Zhang

Subject: Computer Science And Mathematics, Applied Mathematics Keywords: Space-time random field; Fokker-Planck equations; Differential entropy; Jeffreys divergence; Fisher information; De Bruijn identities

Online: 24 August 2023 (09:59:34 CEST)

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Preprint COMMUNICATION | doi:10.20944/preprints202012.0334.v1

Soccer Scoring Techniques — a Scientific Re-conception of Time and Space via Biomechanical Modeling

Xiang Zhang, Gongbing Shan

Subject: Computer Science And Mathematics, Other Keywords: scoring opportunity identification; proprioceptive shooting volume; 0 possession shot; airborne; anthropometry

Online: 14 December 2020 (13:12:20 CET)

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Preprint ARTICLE | doi:10.20944/preprints202408.2013.v1

On the Ionisation Tolerance of C₂₀ Fullerene in Ground and Excited Electronic States in Planetary Nebulae

SeyedAbdolreza Sadjadi, Quentin Andrew Parker

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: astrochemistry; C₂₀ fullerene; Ionisation; excited state; DFT; planetary nebulae

Online: 28 August 2024 (05:16:53 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202207.0175.v1

Orthogonal Frames in Krein Spaces

Osmin Oberto Ferrer Villar, Arley Yessit Sierra Acosta, Osvaldo De Jesus Polo Flórez

Subject: Computer Science And Mathematics, Analysis Keywords: Krein space; fundamental symmetry; Hilbert associated; frames

Online: 12 July 2022 (08:10:52 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202405.0433.v1

A Novel Algorithm for Classifying Vegetation and Non-Vegetation Using Red Edge Slope Coefficient with Hyperspectral LCTF Imaging

Bayarsaikhan Uudus, Bayartsetseg Oyungerel, Yukihiro Takahashi, Erdenebaatar Dashdondog, Turtogtokh Tumenjargal, Narangarvuu Dashdondog, Qinxue Wang, Hasi Bagan, Begzsuren Tumendemberel

Subject: Environmental And Earth Sciences, Ecology Keywords: Hyperspectral Imaging; Liquid Crystal Tunable Filter; Red Edge Slope Coefficient; Spectral Reflectance; Vegetation Classification; Remote Sensing Algorithms

Online: 8 May 2024 (15:28:55 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201608.0178.v1

Bias Correction of Chinese Fengyun-3C Microwave Humidity and Temperature Sounder Measurements in Retrieval of Atmospheric Parameters

Qiurui He, Zhenzhan Wang, Jieying He

Subject: Environmental And Earth Sciences, Atmospheric Science And Meteorology Keywords: FY-3C/MWHTS; linear regression correction; neural networks correction; one-dimensional variational algorithm; atmospheric temperature and humidity profiles

Online: 19 August 2016 (09:22:31 CEST)

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The Microwave Humidity and Temperature sounder (MWHTS) on board the Fengyun (FY)-3C satellite measure the outgoing radiance form the Earth surface and atmospheric constituents. MWHTS makes measurements in the isolated oxygen absorption line near 118 GHz and the vicinity of strong water vapor line around 183 GHz, can provide fine vertical distribution structure of both atmospheric humidity and temperature. However, in order to obtain the accurate soundings of humidity and temperature by the physical retrieval method, bias between the observed radiance and those simulated by radiative transfer model from the background or first guess profiles must be correct. In this study, two bias correction methods are developed through the correlation analysis between MWHTS measurements and air mass identified by the first guess profiles of the physical inversion, one is the linear regression correction (LRC) and the other is neural networks correction (NNC), representing the linear and nonlinear nature between MWHTS measurements and air mass, respectively. Both correction methods have been applied to MWHTS observed brightness temperatures over the geographic area (180° W-180° E, 60° S-60° N). The corrected results are evaluated by the probability density function of the difference between corrected observations and simulated values and the root mean square error (RMSE) with respect to simulated observations. The numerical results show that the NNC method perform better, especially in MWHTS channels 1 and 7-9 whose peak weight function heights are close to the surface. In order to assess the effects of bias correction methods proposed in this study on the retrieval accuracy, a one-dimensional variational system was built and applied to the MWHTS uncorrected and corrected brightness temperatures to estimated atmospheric temperature and humidity profiles, The retrieval results show that the NNC has better performance which is to be expected. An indication of the stability and robustness of NNC method is given which suggests that the NNC method has promising application perspectives in the physical retrieval.

Preprint ARTICLE | doi:10.20944/preprints202312.1409.v1

C-S and Strongly C-S Orthogonal Matrices

Xiaoji Liu, Ying Liu, Hongwei Jin

Subject: Computer Science And Mathematics, Algebra And Number Theory Keywords: C-S inverse; C-S orthogonality; Strongly C-S orthogonality; C-S additivity; C-S partial order

Online: 19 December 2023 (10:46:12 CET)

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Preprint ARTICLE | doi:10.20944/preprints201803.0128.v1

Orthogonal Moment Extraction and Classification of Melanoma Images

Sudhakar Singh, Shabana Urooj

Subject: Computer Science And Mathematics, Computer Vision And Graphics Keywords: moments invariants; ZM,PZM; OFMM; SVM; PSO

Online: 16 March 2018 (05:26:31 CET)

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Preprint ARTICLE | doi:10.20944/preprints202110.0452.v2

Covariant Space-Time Line Elements in the Friedmann-Lemaitre-Robertson-Walker Geometry

David Escors, Grazyna Kochan

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Lorentz invariance violation; FRW metric; general relativity; quantum mechanics; uncertainty principle; quantum gravity

Online: 7 December 2021 (11:37:55 CET)

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Working Paper ARTICLE

A Probe of Micro Space-Time by the Study of Scalar Fields

JIan-Bo Deng, Miao-Yi Deng, Qi-Qi Fan, Peng-Zhang He

Subject: Physical Sciences, Acoustics Keywords: general relativity; scalar field; variational principle

Online: 6 October 2020 (15:50:53 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.0961.v1

Research on Short‐Term Forecasting Model of Global Atmospheric Temperature and Wind in the Near Space Based on Deep Learning

Xingxin Sun, Ting Lan, Yi Liu, Chen Zhou, Jian Feng, Huiyun Yang, Yuqiang Zhang, Zhou Chen, Tong Xu, Zhong-Xin Deng, Zhengyu Zhao

Subject: Environmental And Earth Sciences, Atmospheric Science And Meteorology Keywords: Global atmospheric temperature and wind in the near space; ConvGRU; ConvLSTM; MERRA‐2 reanalysis dataset

Online: 13 August 2024 (14:41:57 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202312.0886.v1

Re-examination of Penrose’s Space-Time Singularity and the Origin of Protons in Astrophysical Jets

Srecko Šorli

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: space-time singularity, astrophysical jets, energy density of superfluid space

Online: 12 December 2023 (11:21:49 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.0543.v1

Random Forest Classifier for Cloud Clearing of the Operational TROPOMI XCH4 Product

Tobias Borsdorff, Mari Carmen Martinez-Velarte, Maarten Sneep, Mark ter Linden, Jochen Landgraf

Subject: Environmental And Earth Sciences, Remote Sensing Keywords: TROPOMI; CH4; SUOMI NPP; VIIRS; CLOUDS; Machine Learning; Random Forest Classifier

Online: 9 February 2024 (10:52:15 CET)

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Preprint ARTICLE | doi:10.20944/preprints202407.2539.v1

Corrections of the Distribution of Nuclei Due to Neutron Degeneracy and Their Effects in the R-Process in Neutron Stars - Black Hole Mergers

Rita K. Y. Lau

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: nuclear astrophysics; nuclear reactions; neutron stars; black holes

Online: 31 July 2024 (14:04:38 CEST)

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Preprint COMMUNICATION | doi:10.20944/preprints201901.0284.v1

Special Orthogonal Polynomials in Quantum Mechanics

Abdulaziz D. Alhaidari

Subject: Computer Science And Mathematics, Applied Mathematics Keywords: tridiagonal representation; orthogonal polynomials; potential functions; asymptotics; recursion relation; spectrum formula

Online: 29 January 2019 (04:37:49 CET)

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Preprint ARTICLE | doi:10.20944/preprints202406.0461.v1

Variations of VEGFR2 Chemical Space: Stimulator and Inhibitory Peptides

Claudiu N. Lungu, Ionel Mangalagiu, Gabriela Gurau, Mihaela Cezarina Hîncu

Subject: Medicine And Pharmacology, Cardiac And Cardiovascular Systems Keywords: peripheral artery disease; molecular modeling; docking; angiogenesis; vascular morphogenesis; chimeric protein

Online: 7 June 2024 (07:32:42 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201608.0108.v1

Quantifying Mosaic Development: Towards an Evo-Devo Postmodern Synthesis of the Evolution of Development via Differentiation Trees of Embryos

Bradly Alicea, Richard Gordon

Subject: Biology And Life Sciences, Anatomy And Physiology Keywords: developmental biology; computational biology; lineage trees; embryogenesis; biological complexity

Online: 10 August 2016 (11:36:39 CEST)

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