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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/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/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 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/preprints202404.1270.v1

An Empirical Examination of Bitcoin’s Halving Effects: Assessing Cryptocurrency Sustainability within the Landscape of Financial Technologies

Juraj Fabuš, Iveta Kremeňová, Natália Stalmašeková, Terézia Kvasnicová-Galovičová

Subject: Business, Economics And Management, Finance Keywords: Bitcoin; Cryptocurrency; Bitcoin Halving; Cryptocurrency sustainability; Bitcoin price dynamics; Digital assets; Tradingview; Market Behavior

Online: 19 April 2024 (10:01:49 CEST)

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Preprint REVIEW | doi:10.20944/preprints201808.0355.v1

High-speed Orbital Angular Momentum Multiplexed Free-space Optical communication systems

Zhen Qu, Ivan Djordjevic

Subject: Engineering, Electrical And Electronic Engineering Keywords: Orbital angular momentum; free-space optical communications; turbulence mitigation

Online: 20 August 2018 (12:34:41 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.0750.v1

Highly Sensitive and Flexible Capacitive Pressure Sensors Combined with Porous Structure and Holes Array by Sacrificial Templates and Laser Ablation

Yibin Zhao, Jingyu Zhou, Chenkai Jiang, Tianlong Xu, Kaixin Li, Dawei Zhang, Bin Sheng

Subject: Engineering, Electrical And Electronic Engineering Keywords: flexible capacitive pressure sensor; porous structure; array of holes; polymer; laser ablation

Online: 12 August 2024 (04:10:59 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.1398.v1

Bidirectional Optical Neural Networks Based on Free-Space Optics Using Lens Arrays and Spatial Light Modulator

Young-Gu Ju

Subject: Physical Sciences, Optics And Photonics Keywords: optical neural network; optical computer; backpropagation; neural network; lens array; free-space optics

Online: 22 April 2024 (11:16:45 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202111.0114.v1

Channel Modeling for In-body Optical Wireless Communications

Stylianos E. Trevlakis, Alexandros-Apostolos A. Boulogeorgos, Nestor D. Chatzidiamantis, George K. Karagiannidis

Subject: Engineering, Electrical And Electronic Engineering Keywords: Absorption coefficient; biomedical engineering; fitting; machine learning; optical properties; pathloss; scattering coefficient.

Online: 5 November 2021 (10:38:49 CET)

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Preprint ARTICLE | doi:10.20944/preprints202408.2095.v1

Scalable Optical Neural Network Based on Free-Space Optics Using Lens Arrays and a Smart Pixel Light Modulator

Young-Gu Ju

Subject: Physical Sciences, Optics And Photonics Keywords: optical neural network; free-space optics; optical computer; smart pixels

Online: 29 August 2024 (08:44:45 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202308.1442.v1

Scalable Optical Convolutional Neural Network Based on Free-Space Optics Using Lens Arrays and a Spatial Light Modulator

Young-Gu Ju

Subject: Physical Sciences, Optics And Photonics Keywords: optical neural network; convolutional neural network; free-space optics; optical computer; smart pixels

Online: 22 August 2023 (03:47:05 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.0009.v1

Algorithm Improvement for Mobile Event Detection with Intelligent Tunnel Robots

Li WAN, Zhenjiang LI, Changan ZHANG, Guangyong CHEN, Panming ZHAO, Kewei WU

Subject: Engineering, Transportation Science And Technology Keywords: YOLOv9 + DeepSORT; Edge Computing; Mobile Event Detection; Smart Tunnels

Online: 1 August 2024 (11:11:29 CEST)

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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/preprints202404.0396.v1

Bi-directional Full-Color Generation and Tri-channel Information Encoding Based on a Plasmonic Metasurface

Dewang Huo, Guoqiang Li

Subject: Physical Sciences, Optics And Photonics Keywords: plasmonic metasurface; full-color generation; tri-channel information encoding; polarization encoding

Online: 5 April 2024 (15:57:57 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202103.0587.v1

Investigation of the Scattering Noise in Underwater Optical Wireless Communications

Behnaz Majlesein, Asghar Gholami, Zabih Ghassemlooy

Subject: Computer Science And Mathematics, Computer Networks And Communications Keywords: UOWC; scattering; scattering noise

Online: 24 March 2021 (13:11:37 CET)

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Preprint ARTICLE | doi:10.20944/preprints202304.0860.v1

Bi-directional Free-Space Visible Light Communication (VLC) Supporting Multiple Moveable Clients Using Special Light Diffusing Optical Fiber (LDOF)

Yun-Han Chang, Chi-Wai Chow, Yuan-Zeng Lin, Yin-He Jian, Chih-Chun Wang, Yang Liu, Chien-Hung Yeh

Subject: Physical Sciences, Optics And Photonics Keywords: Visible light communication (VLC); Optical wireless communication (OWC); Light diffusing optical fiber (LDOF); Laser diode (LD); Light-diffusing optical fiber (LDOF)

Online: 24 April 2023 (12:52:57 CEST)

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Visible light communication (VLC) can offer the advantages of license and electromagnetic interference (EMI) free wireless transmission. As optical signal does not interference with the radio-frequency (RF) signal, VLC can be used to augment RF wireless communication to provide extra communication capacity while without degrading the performance of both signals. In order to achieve high performance VLC transmission, optical alignment between the optical transmit (Tx) and receiver (Rx) is very critical to enhance the received signal-to-noise ratio (SNR). Optical beam-steering at the Tx can be utilized to ensure narrow optical beam can reach the Rx; however, complicated and active tracking are required. Lenses or compound parabolic concentrators (CPCs) can be install in front of the Rx for focusing to enhance the SNR. However, these will limit the Rx field-of-view (FOV) and making the VLC transmission more subjected to misalignment issue. Hence, many creative optical antennas have been proposed and demonstrated using special optical materials as well as special Rx to enhance the FOV of VLC systems. However, they have their limitations, such as data rates and FOVs. In this work, we put forward and demonstrate a bi-direction free-space VLC system supporting multiple moveable Rxs using a light-diffusing optical fiber (LDOF). The downlink (DL) signal is launched from an head-end or central office (CO) far away to the LDOF at the client side via a free-space transmission. When the DL signal is launched to the LDOF, which acts as an optical antenna to re-transmit the DL signal to different moveable Rxs. The uplink (UL) signal is sent via the LDOF towards the CO. In a proof-of-concept demonstration, the LDOF is 100 cm long and the free space VLC transmission between the CO and the LDOF is 100 cm. 210 Mbit/s DL and 850 Mbit/s UL transmissions, meeting the pre-forward-error-correction bit error rate (pre-FEC BER = 3.8 × 10−3) threshold are achieved.

Preprint REVIEW | doi:10.20944/preprints202306.0505.v1

A Free Space Material Measurement System

Renukka Sivakumar, Saidatul Norlyana Azemi, Lee Yengseng, Kok Yeow You, Ping Jack Soh

Subject: Engineering, Electrical And Electronic Engineering Keywords: material measurement techniques; dielectric properties; free space measurement systems.

Online: 7 June 2023 (07:53:41 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0097.v1

Decline in Sensory Integration in Old Age: Evidence from a Virtual Reality Task, and Its Functional Brain Connectivity Correlates

Satoru Inagaki, Hirokazu Matsuura, Kazuki Sakurai, Ludovico Minati, Natsue Yoshimura

Subject: Engineering, Bioengineering Keywords: sensory integration; aging; rsFC; reaching task; virtual reality

Online: 1 April 2024 (17:24:45 CEST)

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Preprint REVIEW | doi:10.20944/preprints202403.0349.v1

A Systematic Literature Review of Zero Trust Architecture for UAV Security Systems in IoBT

Alanoud Abdullah Alquwayzani, Abdullah Abdulrahman Albuali

Subject: Computer Science And Mathematics, Security Systems Keywords: Security; Zero Trust Architecture (ZTA); Drone; UAV, UAV Security; Internet of Battlefield Things (IoBT); Cybersecurity; Suspicious Behavior

Online: 6 March 2024 (11:59:34 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1359.v1

Efficient Pipeline Conflict Resolution for Layered QC-LDPC Decoders in OFDM-PON

Zhijie Wang, Zhengjun Xu, Kun Chen, Yuanzhe Qu, Xiaoqun Liu, Yingchun Li, Junjie Zhang

Subject: Engineering, Electrical And Electronic Engineering Keywords: QC-LDPC; pipeline conflicts; patch method; variable-to-check message; OFDM-PON

Online: 22 March 2024 (09:21:08 CET)

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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/preprints202406.1569.v1

Application of Methods Detecting Xenotransplantation-Relevant Viruses for Screening German Slaughterhouse Pigs

Hina Jhelum, Benedikt B. Kaufer, Joachim Denner

Subject: Biology And Life Sciences, Life Sciences Keywords: porcine viruses; xenotransplantation; virus safety; herpes viruses x porcine endogenous retroviruses x latency

Online: 24 June 2024 (12:03:46 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202008.0129.v1

Design of Streaming Data Transmission Using Rolling Shutter Camera-based Optical Camera Communications

Byung Wook Kim, Jong Ho Yoo, Sung-Yoon Jung

Subject: Computer Science And Mathematics, Information Systems Keywords: Streaming data; Optical camera communications; rolling shutter camera

Online: 5 August 2020 (10:40:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202407.1278.v1

Unveiling the Protective Dynamics of an Ecologically Engineered Wetland Against Acid Mine Drainage: A Case Study in South Africa

Mariette Jansen van Vuuren, Yolandi Schoeman, Anna-Maria Botha, Paul Johan Oberholster

Subject: Environmental And Earth Sciences, Environmental Science Keywords: ecological engineering; acid mine drainage; wetland remediation; biogeochemical processes; contaminant dynamics

Online: 16 July 2024 (08:00:40 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201609.0032.v1

Exploiting Symmetric Energy Harvesting Protocol in Wireless Sensor Networks with Outdated Channel State Information: Protocol Design and Performance Analysis

Dinh-Thuan Do, Hoang-Sy Nguyen, Miroslav Voznak

Subject: Engineering, Electrical And Electronic Engineering Keywords: channel state information; energy harvesting; amplify-and-forward; time power switching relaying; throughput

Online: 8 September 2016 (11:59:56 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202309.1002.v6

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

Kabir Umar

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

Online: 23 September 2024 (12:19:15 CEST)

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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/preprints202306.0324.v1

Porous Gold Nanoparticles: Thermal Stability, Optical Response and Support-Free Synthesis

Laura Juhász, Zoltán Erdélyi, Csaba Cserháti

Subject: Chemistry And Materials Science, Nanotechnology Keywords: porous gold nanoparticles; plasmons, optical absorption,; dewetting, dealloying; support-free nanoparticles

Online: 5 June 2023 (13:20:35 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.1460.v1

Three Cubes Packing for All Dimensions

Peter Adamko

Subject: Computer Science And Mathematics, Mathematics Keywords: packing of cubes; extreme

Online: 22 April 2024 (18:18:39 CEST)

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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/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/preprints202407.1608.v1

Design Considerations for RF Power Amplifiers for Driving Acousto Optical Tunable Filters

Pallab Kr Gogoi, Jurgen Vanhamel, Jerôme Loic

Subject: Engineering, Electrical And Electronic Engineering Keywords: AOTF; RFPA; Class E; efficiency; harmonics suppression; linearity

Online: 20 July 2024 (11:47:51 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201609.0108.v1

Study of Unwanted Emissions Generated by Distributed Energy Resources in Microgrids and their Influence over Narrow Band Power Line Communications

Noelia Uribe-Pérez, Itziar Angulo, Luis Hernández, Txetxu Arzuaga, David De La Vega, Amaia Arrinda

Subject: Engineering, Electrical And Electronic Engineering Keywords: distributed energy resources; meter reading; microgrids; NB-PLC; noise

Online: 27 September 2016 (15:44:03 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202405.0461.v1

RDAGAN:A Residual Dense Attention GAN for Microscopic Image Super-Resolution

Sanya Liu, Xiao Weng, Xingen Gao, Xiaoxin Xu, Lin Zhou

Subject: Engineering, Telecommunications Keywords: single image super-resolution; microscopic image; generative adversarial network; image processing

Online: 8 May 2024 (08:19:25 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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Preprint ARTICLE | doi:10.20944/preprints202401.0821.v1

Hybrid FSO/RF Communications in Space–Air–Ground Integrated Networks: A Reduced Overhead Link Selection Policy

Petros S. Bithas, Hector E. Nistazakis, Athanassios Katsis, Liang Yang

Subject: Engineering, Telecommunications Keywords: Composite fading; free space optical communications; hybrid FSO/RF communications; link selection; space-air-ground integrated networks

Online: 11 January 2024 (02:38:46 CET)

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Preprint ARTICLE | doi:10.20944/preprints202405.1230.v1

Quantitative Assessment and Analysis of Fish Behavior in Closed Systems Using Information Entropy

Minoru Kadota, Shinsuke Torisawa, Tsutomu Takagi

Subject: Biology And Life Sciences, Behavioral Sciences Keywords: Information theory; fish behavior; entropy; quantitative assessment; random walk model

Online: 20 May 2024 (12:37:35 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 ARTICLE | doi:10.20944/preprints202408.1799.v1

Environmental Damage Costs of Insurance Companies

Silvia Bressan

Subject: Business, Economics And Management, Finance Keywords: insurance companies; environmental damages; environmental damage costs; environmental impact ratios; profitability; leverage

Online: 26 August 2024 (08:27:44 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0221.v1

Solar Wind Charge-Exchange X-ray Emissions from the O⁵⁺ Ions in the Earth’s Magnetosheath

Zhicheng Zhang, Fei He, Xiao-Xin Zhang, Guiyun Liang, Xueyi Wang, Yong Wei

Subject: Environmental And Earth Sciences, Space And Planetary Science Keywords: solar wind charge-exchange (SWCX); earth magnetosheath; X-Ray spectrum; interplanetary shock; bow shock; Magnetopause

Online: 2 April 2024 (15:13:11 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 ARTICLE | doi:10.20944/preprints202406.1520.v1

Sensor Systems for Measuring Force and Temperature with Fiber-Optic Bragg Gratings Embedded in Composite Materials

Aliya Kalizhanova, Ainur Kozbakova, Murat Kunelbayev, Zhalau Aitkulov, Anar Utegenova, Ulzhan Imanbekova

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: fiber optic Bragg sensor, composite material, force and temperature measurements, chirp, polymethyl methacrylate

Online: 21 June 2024 (11:44:00 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202310.0486.v1

Optical Design of a Miniaturised Solar Magnetograph for Space Applications

Ariadna Calcines, Lucie M. Green, Alan Smith, David M. Long

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: solar magnetograph; space weather; space sciences; solar instrumentation; miniaturised optics

Online: 9 October 2023 (11:10:47 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202008.0031.v2

Mehmet Erbudak, Selim Onat

Subject: Computer Science And Mathematics, Applied Mathematics Keywords: wallpaper groups; planar ornaments; correlation; multi-dimensional scaling; Arabs; Armenian; Byzantium; Islam; Seljuks; cultural interaction

Online: 14 September 2020 (05:42:34 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.1334.v1

Trends and Challenges in Data Analytics and Machine Learning Using Call Detail Records in Telecom Systems

James Barrett, Phil Legg, Jim Smith, Tim Barnes, Charles Boyle

Subject: Computer Science And Mathematics, Artificial Intelligence And Machine Learning Keywords: call detail records; big data; mobile networks; machine learning

Online: 17 September 2024 (13:30:50 CEST)

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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 REVIEW | doi:10.20944/preprints201809.0243.v1

Label-Free Biosensors Based Onto Monolithically Integrated Onto Silicon Optical Transducers

Michailia Angelopoulou, Sotirios Kakabakos, Panagiota Petrou

Subject: Physical Sciences, Optics And Photonics Keywords: integrated optical sensors; monolithic integration; broad-band interferometers; label-free; multiplexed detection; on-site determinations

Online: 13 September 2018 (14:44:50 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1757.v1

Optimizing Bipolar Reset Waveform to Improve Grayscale Stability in Active Matrix Electrowetting Displays

Taiyuan Zhang, Li Wang, Linwei Liu, Wei Li, Shipeng Wu, Jianyang Guo, Guofu Zhou

Subject: Physical Sciences, Optics And Photonics Keywords: electrowetting display; oil backflow; driving waveform; active matrix; grayscale stability

Online: 23 August 2024 (17:19:06 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202405.1452.v1

Compact and Low-latency FPGA-based NTT Architecture for CRYSTALS Kyber Post-Quantum Cryptography Scheme

Binh Kieu-Do-Nguyen, Nguyen The Binh, Cuong Pham-Quoc, Phuc Nghi Huynh, Ngoc-Thinh Tran, Trong-Thuc Hoang, Cong-Kha Pham

Subject: Computer Science And Mathematics, Hardware And Architecture Keywords: Field-programmable Gate Array; Post-Quantum Cryptography; Number Theoretic 18 Transform; CRYSTALS Kyber; Lightweight design

Online: 22 May 2024 (15:09:05 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202406.1597.v1

LogEDL: Log Anomaly Detection via Evidential Deep Learning

Yunfeng Duan, Kaiwen Xue, Hao Sun, Haotong Bao, Yadong Wei, Zhangzheng You, Yuantian Zhang, Xiwei Jiang, Sangning Yang, Jiaxing Chen, Boya Duan, Zhonghong Ou

Subject: Computer Science And Mathematics, Artificial Intelligence And Machine Learning Keywords: log anomaly detection; evidential deep learning; uncertainty

Online: 24 June 2024 (08:16:17 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.1965.v1

Eicosapentaenoic Acid Rescues L-Type Ca²⁺ Channel Remodeling Caused by Saturated Fatty Acids via Both Free Fatty Acid Receptor 4-Dependent and -Independent Pathways in Cardiomyocytes

Masaki Morishima, Pu Wang, Kosuke Horii, Kazuki Horikawa, Katsushige Ono

Subject: Medicine And Pharmacology, Dietetics And Nutrition Keywords: eicosapentaenoic acid; oleic acid; palmitic acid; omega-3 polyunsaturated fatty acid; PUFA; FFAR4; CREB; Cav1.2; L-type Ca²⁺ channel

Online: 30 April 2024 (08:17:49 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202409.1642.v1

In-Situ Multiphysical Metrology for Photonic Wire Bonding by Two Photon Polymerization

Yu Lei, Wentao Sun, Xiaolong Huang, Yan Wang, Jinling Gao, Xiaopei Li, Rulei Xiao, Biwei Deng

Subject: Chemistry And Materials Science, Materials Science And Technology Keywords: two-photon polymerization; photonic wire bonding; in-situ SEM; optical loss; mechanical reliability

Online: 23 September 2024 (02:31:33 CEST)

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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/preprints202405.1823.v1

FCM-DETR: An Efficient End-to-End Fire Smoke and Human Detection based on Deformable DETR

Tianyu Liang, Guigen Zeng

Subject: Computer Science And Mathematics, Computer Vision And Graphics Keywords: fire smoke and human detection; Deformable-DETR; Mixed encoder; PIoUV2; ConvNeXt

Online: 28 May 2024 (06:49:46 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202005.0416.v1

All Femtosecond Optical Pump and X-Ray Probe: Holey-Axicon for Free Electron Laser

Vijayakumar Anand, Jovan Maksimovic, Tomas Katkus, Soon Hock Ng, Orestas Ulcinas, Mindaugas Mikutis, Justas Baltrukonis, Antanas Urbas, Gintas Slekys, H. Ogura, Daisuke Sagae, Tatiana Pikuz, Toshihiro Somekawa, Norimasa Ozaki, Arturas Vailionis, Gediminas Seniutinas, Vygantas Mizeikis, Karl Glazebrook, Jean P. Brodie, Paul R. Stoddart, Ludovic Rapp, Andrei V. Rode, Eugene G. Gamaly, Saulius Juodkazis

Subject: Physical Sciences, Quantum Science And Technology Keywords: X-rays; free electron laser (FEL); ultra-short phenomena; pump-probe; warm-dense matter; astrophotonics; co-axial volumetric interaction diagnostics

Online: 26 May 2020 (03:53:19 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/preprints202409.1700.v1

Ionospheric Absorption Variation Based on Ionosonde and Riometer Data and the NOAA D-RAP Model over Europe During Intense Solar Flares in September, 2017

Veronika Barta, Tamás Bozóki, Dávid Péter Süle, Daniel Kouba, Jens Mielich, Tero Raita, Attila Buzás

Subject: Environmental And Earth Sciences, Space And Planetary Science Keywords: space weather; solar flare; ionosphere; ionospheric absorption; ionosonde data; HF radio wave absorption; radio fade-out; riometer; D-RAP model

Online: 23 September 2024 (12:16:33 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202311.1779.v1

Exact and Paraxial Broadband Airy Wave Packets in Free Space and a Temporally Dispersive Medium

Ioannis M. Besieris, Peeter Saari

Subject: Physical Sciences, Optics And Photonics Keywords: airy beams; nondiffracting pulses; localized waves; space-time wavepackets

Online: 28 November 2023 (07:31:50 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/preprints201707.0048.v1

An Alternative Approach to Estimate the Vacuum Energy Density of Free Space

Vernon Cooray, Gerald Cooray, Farhad Rachidi

Subject: Physical Sciences, Acoustics Keywords: expansion of the universe; vacuum energy; dark energy; time energy uncertainty principle; radius of the universe

Online: 18 July 2017 (12:18:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202405.0468.v1

SDC-Net++: End-to-End Crash Detection and Action Control for Self-Driving Car Deep-IoT-Based System

Mohammed Abdou Tolba, Hanan Ahmed Kamal

Subject: Engineering, Automotive Engineering Keywords: Autonomous driving, deep learning; computer vision; multitask learning; crash detection; path planning; automatic emergency braking; camera-cocoon; IoT; system

Online: 8 May 2024 (15:51:48 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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Preprint ARTICLE | doi:10.20944/preprints202307.0479.v1

Interpreting Seasonal Patterns and Long Term Changes of Zooplankton in a Deep Subalpine Lake Using Stable Isotope Analysis

Rossana Caroni, Roberta Piscia, Gary Free, Marina Manca

Subject: Environmental And Earth Sciences, Environmental Science Keywords: freshwater zooplankton; stable isotope analysis; lake; climate change; food web

Online: 7 July 2023 (10:35:42 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.1818.v1

Deploying Wireless Sensor Networks in Multi-Story Buildings towards IoT-Based Intelligent Environments: An Empirical Study

Nurul I. Sarkar, Sonia Gul

Subject: Computer Science And Mathematics, Computer Networks And Communications Keywords: wireless sensor network (WSN); intelligent buildings; IoT

Online: 28 April 2024 (05:57:15 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/preprints202409.0656.v1

Novel Long Distance Free Space Quantum Secure Direct Communication for Web 3.0 Networks

Yifan Zhou, Xinlin Zhou, Zi Yan Li, Yew Kee Wong, Yan Shing Liang

Subject: Physical Sciences, Quantum Science And Technology Keywords: Quantum Cryptography; Web 3.0; Quantum Secure Direct Communication; Long-Distance Free- Space Quantum Secure Direct Communication; Quantum Security

Online: 9 September 2024 (12:42:23 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202211.0312.v1

A High-Power Propellant-Free Electromagnetic Propulsion Interacting on Local Space-Time Curvature

Li Zhe

Subject: Engineering, Electrical And Electronic Engineering Keywords: Electromagnetic propulsion; High power; Propellant free; General Relativity; nuclear fusion

Online: 16 November 2022 (13:10:17 CET)

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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/preprints202404.1816.v1

Polarimeter for Detection of Anisotropy from Reflectance

Shuji Kamegaki, Zahra Khajehsaeidimahabadi, Meguya Ryu, Nguyen Hoai An Le, Soon Hock Ng, Ričardas Buividas, Gediminas Seniutinas, Vijayakumar Anand, Saulius Juodkazis, Junko Morikawa

Subject: Physical Sciences, Optics And Photonics Keywords: polarimetry; anisotropy; birefringence, four-polarisation method

Online: 28 April 2024 (05:34:20 CEST)

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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/preprints202402.1746.v1

Perception of Selected Factors on the Sustainability of SMEs: Empirical Study from Visegrad Group Countries

Mária Hudáková, Juraj Cúg, Peter Karácsony, Zora Petráková, Ján Dvorský, Michał Bernard Pietrzak

Subject: Business, Economics And Management, Business And Management Keywords: business risk; case study; questionnaire; SMEs; sustainability; Visegrad Group countries.

Online: 29 February 2024 (13:50:04 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/preprints202402.1324.v1

Spatial-Multitemporal Analysis of Heatwaves in Thailand: Discrepancies between In-Situ Air Temperature and Remote Sensing-Derived Land Surface Temperature

Thitimar Chongtaku, Attaphongse Taparugssanagorn, Hiroyuki Miyazaki, Takuji W Tsusaka

Subject: Environmental And Earth Sciences, Remote Sensing Keywords: heat wave; heatwaves detection; land surface heatwaves; data gap-filling; machine learning algorithm; random forest regression; spatio-temporal databases; geospatial analysis; air temperature; land surface temperature

Online: 23 February 2024 (08:40:08 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0681.v1

Trypsin and Trypsinogen Activation Peptide in the Prediction of Severity of Acute Pancreatitis

Andreas Allemann, Sebastian Manuel Staubli, Christian Andreas Nebiker

Subject: Medicine And Pharmacology, Surgery Keywords: Acute pancreatitis; severity; prediction; trypsin; trypsinogen activation peptide

Online: 12 March 2024 (08:13:16 CET)

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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 ARTICLE | doi:10.20944/preprints202007.0685.v1

High-quality-factor Optical Microresonators Fabricated on Lithium Niobite Thin Film with an Electro-optical Tuning Range Spanning Over One Free Spectral Range

Zhe Wang, Chaohua Wu, Zhiwei Fang, Min Wang, Jintian Lin, Rongbo Wu, Jianhao Zhang, Jianping Yu, Miao Wu, Wei Chu, Tao Lu, Gang Chen, Ya Cheng

Subject: Physical Sciences, Applied Physics Keywords: microresonators; lithium niobate; electro-optical tuning; chemo-mechanical etching

Online: 28 July 2020 (13:58:37 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202308.0446.v1

Clinical and Optical Coherence Tomography Evidence of Aqueous Humor Flow from the Suprachoroidal Space to Conjunctival Lymphatics

Vinod Kumar, Andrey Igorevich Bezzabotnov, Zarina Shaykuliyevna Rustamova, Galina Nikolaevna Dushina, Kamal Abdulmuhsen Abu Zaalan, Ahmad Saleh Soliman Shradqa, Mikhail Aleksandrovich Frolov

Subject: Medicine And Pharmacology, Ophthalmology Keywords: glaucoma; open-angle glaucoma; collagen implant; glaucoma surgery; bleb less glaucoma surgery; bleb independent glaucoma surgery; suprachoroidal space; uveolymphatic aqueous humor outflow; conjunctival lymphatic vessels; conjunctival lymphatics

Online: 4 August 2023 (13:18:18 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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Preprint ARTICLE | doi:10.20944/preprints202407.1983.v1

Solubility/Insolubility: A Possible Option for Recycling Polystyrene

Ángel Isidro Hernández-García, Sarai Alejandro-Hernández, Zujey Berenice Cuevas-Carballo, Jorge Alberto Galaviz-Pérez, José Manuel Vázquez-Rodríguez, David Guerrero-Zárate

Subject: Environmental And Earth Sciences, Waste Management And Disposal Keywords: Process simulation; Precipitation; Recycling; Circular Economy; Green Solvents

Online: 25 July 2024 (00:13:19 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202308.1091.v1

Aesthetic Assessment of Free-Form Space Structures Using Machine Learning Based on the Expert's Experiences

Yaser Shahbazi, Mahsa Ghofrani, Siamak Pedrammehr

Subject: Engineering, Civil Engineering Keywords: Free-form Space Structure; Parametric Modelling; Artificial Neural Network; Aesthetics

Online: 15 August 2023 (11:51:10 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202405.1658.v1

Energy Consumption Modeling for Heterogeneous IoT-WSN Devices: Entire Modes and Operation Cycles Considerations

Canek Portillo, Jorge Martinez-Bauset, Vicent Pla, Vicente Casares-Giner

Subject: Engineering, Telecommunications Keywords: energy consumption modeling; wireless sensor network; WSN MAC protocol; internet of things

Online: 27 May 2024 (10:37:40 CEST)

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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/preprints202409.1433.v1

Feature Coding and Graph via Transformer: Different Granularities Classification for Aircrafts

Jianghao Rao, Senlin Qin, Zongyan An, Jianlin Zhang, Qiliang Bao, Zhenming Peng

Subject: Computer Science And Mathematics, Artificial Intelligence And Machine Learning Keywords: fine-grained; aircraft recognition; label divisions; swin-transformer

Online: 20 September 2024 (03:47:37 CEST)

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Against the background of the sky, imaging and perception of aircraft are cru- cial. Among these, the location of aircrafts is not a very difficult problem in general, because that deep learning algorithms and object detection models based on convolutional neural network(CNN) are ever-evolving. In order to have a better identification of various aircrafts, or to accurately locate different types of flying targets in the sky, it becomes significant to distinguish and recognize different types of aircrafts. One question is that, distinguishing and recognizing between sub-categories of aircrafts pose great challenges. Although fine-grained recognition focuses on exploring and studying such problems, aircrafts under different sub-categories and granularities lead us to rethink the application of features. We noticed that features in swin-transformer demonstrates the under- standing and processing of images, fully showcasing the encoding and indexing of information. Through this research and proposed approach, we discovered a better understanding of features encoding and use, which are inspired by the feature encoding and computation in swin-transformer. In our paper, our ap- proach has achieved effects on features encoded graphically, manifested from the architecture design and convolutional neural network computation, and outper- forms other famous fine-graiend classification models on this issue. Not only approach we proposed has demonstrated superior performance in fine-grained aicraft classification, but also the mechanisms of the feature encoding under different sample space partitions is revealed for this issue, which provides a re- search for the representation of aircraft fineness characteristics. The relationship between representation orientation of aircraft feature information under various grained divisions, shows that the recognition of different categories according to man-made, such as aircraft, can be achieved by means of the feature represen- tations studied in this paper, for more specific defined classification tasks and various man-made targets partition criteria, which may influences the princi- ple of design for calculation and feature extraction in fine-grained classification models.

Preprint REVIEW | doi:10.20944/preprints202404.0460.v1

Quantum Correlation Enhanced Optical Imaging

Siddhant Vernekar, Jolly Xavier

Subject: Physical Sciences, Optics And Photonics Keywords: Quantum photonics, Quantum imaging, Quantum correlations, Quantum key distribution, Quantum sensing

Online: 8 April 2024 (13:53:54 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202406.1904.v1

Double Polarized Optical Link for Mobile Networks

Tibor Berceli, Nada Badraoui

Subject: Engineering, Telecommunications Keywords: double orthogonal polarization; capacity enhancement; combined optical – wireless link; polarization extinction ratio

Online: 27 June 2024 (02:46:30 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202406.0038.v1

Laser Machining at High ∼PW/cm2 Intensity and High Throughput

Nan Zheng, Ričardas Buividas, Hsin-Hui Huang, Dominyka Stonyte, Suresh Palanisamy, Tomas Katkus, Maciej Kretkowski, Paul R. Stoddart, Saulius Juodkazis

Subject: Engineering, Aerospace Engineering Keywords: laser machining; ultra-short laser pulses; 3D printing

Online: 3 June 2024 (08:57:36 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.1855.v1

The Past, Present, and Future of the Internet: A Statistical, Technical, and Functional Comparison of Wired/Wireless Fixed/Mobile Internet

Shahriar Shirvani Moghaddam

Subject: Engineering, Electrical And Electronic Engineering Keywords: internet; fixed; mobile; wired; wireless; broadband; optical fiber; fifth generation (5G) cellular; starlink; sixth generation (6G); internet of things

Online: 29 April 2024 (04:18:46 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/preprints202402.0020.v1

Secure Edge Communications Over the IoT

Andreas Plageras, Christos L. Stergiou, Konstantinos Psannis

Subject: Computer Science And Mathematics, Security Systems Keywords: Algorithms; IoT; Big Data Privacy; Cyber-Security; Edge Computing; Healthcare; Threats; Vulnerabilities

Online: 1 February 2024 (04:27:56 CET)

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Preprint ARTICLE | doi:10.20944/preprints202310.0896.v1

Electrical Properties of Ferrite Absorber in High-Band 5G System Determined by Open Coaxial Probe and Free Space Methods

Rafał Przesmycki, Marek Bugaj

Subject: Engineering, Electrical And Electronic Engineering Keywords: ferrite; absorber; permittivity; permeability; open coaxial probe method; free space method

Online: 13 October 2023 (11:19:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202308.2052.v1

Deep Learning-Based Link Quality Estimation for RIS-Assisted UAV-Enabled Wireless Communications System

Belayneh Abebe Tesfaw, Rong-Terng Juang, Li-Chia Ta, Hsin-Piao Lin, Getaneh Berie Tarekegn, And Kabore Wendenda Nathanael

Subject: Computer Science And Mathematics, Computer Networks And Communications Keywords: Link quality estimation; reconfigurable intelligent surfaces (RIS); gated recurrent unit (GRU); unmanned aerial vehicle (UAV).

Online: 30 August 2023 (11:39:45 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/preprints201908.0256.v1

Large-Scale Antenna Systems and Massive Machine Type Communications

Felipe Augusto Pereira de Figueiredo, Fabbryccio A. C. M. Cardoso, Joao Paulo Miranda, Ingrid Moerman, Claudio F. Dias, Gustavo Fraidenraich

Subject: Engineering, Electrical And Electronic Engineering Keywords: massive MIMO; spectral efficiency; MTC

Online: 25 August 2019 (16:48:58 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201907.0191.v1

Mapping Physiognomic Types of Indigenous Forest in New Zealand Using Space-Borne SAR, Optical Imagery and Air-Borne LiDAR

John R. Dymond, Jan Zörner, James D. Shepherd, Susan K. Wiser, David Pairman, Marmar Sabetizade

Subject: Environmental And Earth Sciences, Environmental Science Keywords: forest types; forest mapping; Sentinel-2; SAR; LiDAR; canopy metrics

Online: 16 July 2019 (08:12:02 CEST)

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