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arXiv 2024年

作者： Laeremans, Wout Segers, Midas Voorspoels, Aderik Carlon, Enrico Hooyberghs, Jef Soft Matter and Biological Physics Department of Applied Physics Institute for Complex Molecular Systems Eindhoven University of Technology P.O. Box 513 Eindhoven5600 MB Netherlands Soft Matter and Biophysics Unit KU Leuven Celestijnenlaan 200D Leuven3001 Belgium UHasselt Faculty of Sciences Data Science Institute Theory Lab Agoralaan Diepenbeek3590 Belgium

Coarse-grained models have emerged as valuable tools to simulate long DNA molecules while maintaining computational efficiency. These models aim at preserving interactions among coarse-grained variables in a manner that mirrors the underlying atomistic description. We explore here a method for testing coarse-grained vs. all-atom models using stiffness matrices in Fourier space (q-stiffnesses), which are particularly suited to probe DNA elasticity at different length scales. We focus on a class of coarse-grained rigid base DNA models known as cgDNA and its most recent version cgDNA+. Our analysis shows that while cgDNA+ follows closely the q-stiffnesses of the all-atom model, the original cgDNA shows some deviations for twist and bending variables which are rather strong in the q → 0 (long length scale) limit. The consequence is that while both cgDNA and cgDNA+ give a suitable description of local elastic behavior, the former misses some effects which manifest themselves at longer length scales. In particular, cgDNA performs poorly on the twist stiffness with a value much lower than expected for long DNA molecules. Conversely, the all-atom and cgDNA+ twist is strongly length scale dependent: DNA is torsionally soft at a few base pair distances, but becomes more rigid at distances of a few dozens base pairs. Our analysis shows that the bending persistence length in all-atom and cgDNA+ is somewhat overestimated. © 2024, CC BY.

关键词： Stiffness

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Advanced Computing Approach for Modeling and Prediction COVID-19 Pandemic

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applied Bionics and Biomechanics 2022年第0期2022卷 6056574页

作者： Morsi, Sami A. Alzahrani, Mohammad Eid Applied College In Abqaiq King Faisal University P.O. Box 400 Al-Ahsa31982 Saudi Arabia Al-Neelain University Sudan Faculty Of Computer Science And Information Technology Al Baha University Saudi Arabia

The emergence of many strains of the coronavirus, including the latest omicron strain, which is spreading at a very high speed, is leading to the World Health Organization's (WHO) concern about the creation of this new mutation. Therefore, there is a strong motivation for modeling and predicting COVID-19 to control the number of cases of the disease. The proposed system for predicting the number of cases of COVID-19 can help governments take precautions to prevent the spread of the disease. In this paper, a statistical logistic growth model was employed to predict the spread of COVID-19 in Australia and Brazil. The datasets were collected from the surveillance systems in Australia and Brazil from March 13, 2020, to December 12, 2021, for 641 days. This proposed method used a tested logistic growth model for the complex spread of COVID-19 and forecasted future values within a time interval of six days. The results of the predicted, cumulative, confirmed cases indicate the robustness and effectiveness of the proposed system, which was categorized by time-dependent dynamics. The coefficient of determination (R) metric was used to evaluate the model to predict COVID-19, and the proposed system scored the highest correlation (R2=99%). The proposed system has the potential to contribute to public health by making decisions about how to prevent the spread of COVID-19. © 2022 Sami A. Morsi and Mohammad Eid Alzahrani.

关键词： COVID-19

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Uv-Assisted Gas Sensing by Ink-Printed Mos2 Devices

SSRN

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SSRN 2023年

作者： Drozdowska, Katarzyna Smulko, Janusz Czubek, Jakub Rumyantsev, Sergey Kwiatkowski, Andrzej Department of Metrology and Optoelectronics Faculty of Electronics Telecommunications and Informatics Gdańsk University of Technology G. Narutowicza 11/12 Gdańsk80-233 Poland Institute of Nanotechnology and Material Science Faculty of Applied Physics and Mathematics Gdańsk University of Technology G. Narutowicza 11/12 Gdańsk80-233 Poland CENTERA Laboratories Institute of High Pressure Physics PAS Warsaw Poland

In this work, MoS2 flakes dispersed in ethanol-water solution were printed on ceramic substrates and investigated toward nitrogen dioxide (NO2), ammonia (NH3), and acetone (C3H6O) under UV light (275 nm) assistance. The detection limit (DL) toward the selected gases remained in the sub-ppm level at room temperature and was enhanced after post-processing the sensor resistive response data. MoS2 sensor exhibited a short-time resistance drift during detection, suggesting a stabilization process of the layer’s conducting properties of a specific relaxation time. Therefore, subtracting the baseline burden with exponential drift exposed the actual direction of changes induced by oxidizing and reducing gases and reduced DL to only 83 ppb, 133 ppb, and 359 ppb for NO2, NH3, and C3H6O, respectively. This way, we introduced a simple and low-cost method of gas sensor fabrication using ink-printed MoS2 and the possibility of enhancing DL through data processing. © 2023, The Authors. All rights reserved.

关键词： Acetone

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Identifying Scenarios in Field Data to Enable Validation of Highly Automated Driving Systems

arXiv

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arXiv 2022年

作者： Reichenbächer, Christian Rasch, Maximilian Kayatas, Zafer Wirthmüller, Florian Hipp, Jochen Dang, Thao Bringmann, Oliver Mercedes-Benz AG Sindelfingen Germany Department of Computer Science University of Tübingen Tübingen Germany Institute of Technical Mechanics and Vehicle Dynamics Brandenburg University of Technology Cottbus Germany Ulm University Ulm Germany Faculty Computer Science and Engineering Esslingen University of Applied Sciences Esslingen Germany

Scenario-based approaches for the validation of highly automated driving functions are based on the search for safety-critical characteristics of driving scenarios using software-in-the-loop simulations. This search requires information about the shape and probability of scenarios in real-world traffic. The scope of this work is to develop a method that identifies predefined logical driving scenarios in field data, so that this information can be derived subsequently. More precisely, a suitable approach is developed, implemented and validated using a traffic scenario as an example. The presented methodology is based on qualitative modelling of scenarios, which can be detected in abstracted field data. The abstraction is achieved by using universal elements of an ontology represented by a domain model. Already published approaches for such an abstraction are discussed and concretised with regard to the given application. By examining a first set of test data, it is shown that the developed method is a suitable approach for the identification of further driving scenarios. Copyright © 2022, The Authors. All rights reserved.

关键词： Autonomous vehicles

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SUIM project: measuring the upper atmosphere from the ISS by observations of the CXB transmitted through the Earth rim

arXiv

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arXiv 2024年

作者： Nobukawa, Kumiko K. Takeda, Ayaki Katsuda, Satoru Tsuru, Takeshi G. Nakazawa, Kazuhiro Mori, Koji Uchida, Hiroyuki Nobukawa, Masayoshi Kurogi, Eisuke Kishimoto, Takumi Matsui, Reo Aoki, Yuma Ito, Yamato Kuwano, Satoru Tanaka, Tomitaka Uenomachi, Mizuki Matsuda, Masamune Yamawaki, Takaya Kohmura, Takayoshi Faculty of Science and Engineering Kindai University 3-4-1 Kowakae Higashi-Osaka577-8502 Japan Department of Applied Physics and Electronic Engineering Faculty of Engineering University of Miyazaki 1-1 Gakuen Kibanadai Nishi Miyazaki Miyazaki889-2192 Japan Graduate School of Science and Engineering Saitama University 255 Shimo-Ohkubo Sakura Saitama338-8570 Japan Department of Physics Faculty of Science Kyoto University Kitashirakawa Oiwake-cho Sakyo-ku Kyoto606-8502 Japan Kobayashi-Maskawa Institute for the Origin of Particles and the Universe Nagoya University Furo-cho Chikusa-ku Aichi Nagoya464-8601 Japan Faculty of Education Nara University of Education Takabatake-cho Nara Nara630-8528 Japan Institute of Innovative Research Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo152-8550 Japan Department of Physics Tokyo University of Science 2641 Yamazaki Chiba Noda270-8510 Japan

The upper atmosphere at the altitude of 60–110 km, the mesosphere and lower thermosphere (MLT), has the least observational data of all atmospheres due to the difficulties of in-situ observations. Previous studies demonstrated that atmospheric occultation of cosmic X-ray sources is an effective technique to investigate the MLT. Aiming to measure the atmospheric density of the MLT continuously, we are developing an X-ray camera, "Soipix for observing Upper atmosphere as Iss experiment Mission (SUIM)", dedicated to atmospheric observations. SUIM will be installed on the exposed area of the International Space Station (ISS) and face the ram direction of the ISS to point toward the Earth rim. Observing the cosmic X-ray background (CXB) transmitted through the atmosphere, we will measure the absorption column density via spectroscopy and thus obtain the density of the upper atmosphere. The X-ray camera is composed of a slit collimator and two X-ray SOI-CMOS pixel sensors (SOIPIX), and will stand on its own and make observations, controlled by a CPU-embedded FPGA "Zynq". We plan to install the SUIM payload on the ISS in 2025 during the solar maximum. In this paper, we report the overview and the development status of this project. © 2024, CC BY.

关键词： X ray cameras

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Refined finite-size analysis of binary-modulation continuous-variable quantum key distribution

arXiv

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arXiv 2023年

作者： Matsuura, Takaya Yamano, Shinichiro Kuramochi, Yui Sasaki, Toshihiko Koashi, Masato Department of Applied Physics Graduate School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan Centre for Quantum Computation & Communication Technology School of Science RMIT University MelbourneVIC3000 Australia Department of Physics Faculty of Science Kyushu University Motooka Nishi-ku Fukuoka744 Japan Photon Science Center Graduate School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan

Recent studies showed the finite-size security of binary-modulation CV-QKD protocols against general attacks. However, they gave poor key-rate scaling against transmission distance. Here, we extend the security proof based on complementarity, which is used in the discrete-variable QKD, to the previously developed binary-modulation CV-QKD protocols with the reverse reconciliation under the finite-size regime and obtain large improvements in the key rates. Notably, the key rate in the asymptotic limit scales linearly against the attenuation rate, which is known to be optimal scaling but is not achieved in previous finite-size analyses. This refined security approach may offer full-fledged security proofs for other discrete-modulation CV-QKD protocols. © 2023, CC BY.

关键词： Quantum cryptography

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Comparative analysis of bidirectional DC-DC converters for fuel cell hybrid vehicles 10

Comparative analysis of bidirectional DC-DC converters for f...

引用

10th International Conference on Power Electronics, Machines and Drives, PEMD 2020

作者： Hasimi, Noass Hinz, Hartmut Schofield, Nigel Faculty of Computer Science and Engineering Frankfurt University of Applied Sciences Frankfurt Germany Department of Engineering and Technology University of Huddersfield Huddersfield United Kingdom

ISBN: (纸本)9781839535635

Fuel cell hybrid vehicles use an electric energy storage system such as a battery that can provide additional traction power. This is needed to improve vehicle operation during acceleration and to avoid dynamic current stress of the fuel cell stack. The battery is used for regenerative braking and is connected to the DC-bus of the drive train via a bidirectional DC-DC converter. This paper investigates non-isolated hard-switched bidirectional DC-DC converters with voltage and current ratings which are common in fuel cell hybrid vehicles. The focus is on the comparative analysis of converters regarding the current and voltage stress as well as on the passive component design. Furthermore, a general evaluation for the use in fuel cell hybrid vehicles is discussed. © PEMD *** right reserved.

关键词： DC-DC converters

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Development of high performance computing systems 27th

Development of high performance computing systems

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27th International Conference on computer Networks, CN 2020

作者： Kozielski, Stanislaw Mrozek, Dariusz Department of Applied Informatics Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Akademicka 16 Gliwice44-100 Poland

ISBN: (纸本)9783030507183

The aim of the work is to present the development trends of high performance computers. The analysis focused on system architecture, processors and computing accelerators used. Particular attention was paid to interconnection networks, connecting system nodes. The problem of energy saving in the construction of large systems was also discussed. The data from the list of 500 largest computer systems was used in the analysis. © Springer Nature Switzerland AG 2020.

关键词： Energy conservation

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Advantages of Using Runtime Procedural Generation of Virtual Environments Based on Real World Data for Conducting Empirical Automotive Research 22nd

Advantages of Using Runtime Procedural Generation of Virtual...

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22nd International Conference on Human-computer Interaction, HCII 2020

作者： Barz, Arthur Conrad, Jan Wallach, Dieter HCI2B Group Faculty of Computer Science and Micro Systems Technology Hochschule Kaiserslautern – University of Applied Sciences Zweibruecken Germany

ISBN: (纸本)9783030599867

Driving simulations have become important research tools for improving the in-car user experience. Simulations are especially indispensable when conducting empirical studies in a human-centered development process, where iterative testing in real-world environments is very time-consuming, expensive and potentially dangerous. Constantly advancing possibilities offered by new generations of driving simulations increase the demands and expectations of simulation systems. While the implementation of many components such as simulation hardware or driving physics is very mature by now, the realization of virtual driving environments and scenarios is still a challenging endeavor. A partially automated, algorithmic generation of virtual environments based on real world data provides a possible solution to simplify set-up and execution of research scenarios. The data formats used for this purpose are digital elevation models and map data that can be iteratively processed, improved and expanded for the use in a concrete study. This approach usually requires additional manual steps after the procedural generation is completed. This paper outlines an automated, algorithmic generation of virtual environments based on real-world data, realized at runtime and without subsequent manual post-processing. Significant benefits in automotive research enabled by this approach such as rapid prototyping of study scenarios, support for large-scale virtual environments and the analysis of driving behavior in familiar environments are described. © 2020, Springer Nature Switzerland AG.

关键词： Virtual reality

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Structural and Thermoelectric Power Properties of Fev0.64-Xzrxhf0.16ti0.2sb Alloys

SSRN

引用

SSRN 2022年

作者： Adam, Alaa M. El-Khouly, A. Khovaylo, V. Hassan, Mohamed A. Abdel-Rehim, Wael M.F. National University of Science and Technology MISIS Moscow119049 Russia Physics Department Damanhour University Damanhour22516 Egypt Physics Department Sohag University Sohag82524 Egypt Faculty of Computers and Information Suez University Suez Egypt Faculty of Computer Science and Engineering King Salman International University Sinai Egypt Faculty of Engineering King Salman International University Sinai Egypt

Alloys of FeVSb and FeV0.64-xZrxHf0.16Ti0.2Sb half-Heusler materials were obtained by induction melting followed by mechanical alloying (MA). Parent FeVSb alloy was doped with V, Hf and Ti and well-studied in a previous report, while in this article Zr was used as dopant, replacing the positions of V atoms. Crystal structure and thermoelectric properties were investigated before and after Zr doping. X-ray diffraction (XRD) analysis, scanning electron microscope (SEM) and energy dispersive x-ray spectroscopy (EDX) were employed for structural and morphological study. Microstructure investigations showed that grain sizes decrease with increasing the level of Hf doping (x). Transport and thermoelectric properties were investigated against temperature over a temperature range from 300 to 700 K. Electrical conductivity of the doped samples showed metallic-like behavior, whilst the FeV0.64Hf0.16Ti0.2Sb alloy exhibited semiconducting trend. Seebeck coefficient of the parent FeVSb compound showed negative sign which refers to an n-type conduction. Interestingly, the sign has changed to a positive one with introducing Hf in the FeVSb lattice at different concentrations (x ≥ 0.1), which is due to one less valence electron in Zr as compared to V. The difference between the host atom (V) and the impurity atom (Hf) in terms of mass and size has resulted in a mass fluctuation and consequently a disorder scattering. The absolute value of the Seebeck coefficient |S| of the FeVSb system was measured at 110 µV/K with highest thermal conductivity value of 10.46 Wm-1K-1 near room temperature and a maximum power factor of 1.07 mWm−1 K−2 at 420 K. The thermal conductivity decreased rapidly upon Hf doping due to increased point defect scattering caused by Hf introducing to the FeVSb system. The maximum figure of merit (zT) value of 0.27 at 700 K for FeV0.64Hf0.16Ti0.2Sb was recorded in this study. © 2022, The Authors. All rights reserved.

关键词： Scanning electron microscopy

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