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Journal of physics: Conference Series 2018年第1期1144卷

作者： Theerapat Arpornrat Sujittra Ratjiranukool Pakpoom Ratjiranukool Hidekata Sasaki Master's Degree Program in Applied Physics Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai Thailand. Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai Thailand. Department of Physics Faculty of Science and Technology Chiang Mai Rajabhat University Chiang Mai Thailand. Meteorological Research Institute Tsukaba Japan.

The 5×5 km resolution of Non-Hydrostatic Regional Climate Model (NHRCM) developed by Meteorological Research Institute, Japan was used to evaluate the southwest monsoon season that affects to Thailand during mid-May until mid-October in each years. Bulk-type cloud microphysics, Kain-Fritsch convective scheme, Mellor-Yamada-Nakanishi-Niino level 3 PBL scheme, clear-sky radiation scheme and Hirai-Ohizumi land surface scheme are used as model configuration to simulate climate data under high emission scenario-RCP 8.5. This research was conducted for 2 time periods, i.e., baseline period (1981–2000) and future period (2080–2099), to estimate the southwest monsoon season onset and offset over Thailand by using average wind vector and cumulative precipitation in consecutive 5 days (pentad). Furthermore, the rain-break phase, less precipitation ranges during the southwest monsoon season, had also been analysed.

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Summary of "Biomedical Acoustics and Physical Acoustics: Shock Waves and Ultrasound for Calculus Fragmentation"

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Proceedings of meetings on acoustics. Acoustical Society of America 2018年第1期35卷 002001页

作者： Julianna C Simon Michael R Bailey Graduate Program in Acoustics Pennsylvania State University Penn State 201E Applied Sciences Building University Park Pennsylvania 16802. Center for Industrial and Medical Ultrasound Applied Physics Laboratory University of Washington 1013 NE 40th St. Seattle Washington 98105.

This paper summarizes the special session, "Shock Waves and Ultrasound for Calculus Fragmentation," that took place during the 176th Meeting of the Acoustical Society of America and 2018 Acoustics Week in Canada. The sessions were cosponsored by the Biomedical Acoustics and Physical Acoustics Technical Committees and consisted of ten talks by industry and academic researchers from institutions in the United States, France, and the Russian Federation. The sessions described basic and applied acoustic research to manage urinary stones.

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On the uniqueness of FROG methods

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arXiv 2017年

作者： Bendory, Tamir Sidorenko, Pavel Eldar, Yonina C. Program in Applied and Computational Mathematics Princeton University PrincetonNJ United States Department of Physics and Solid State Institute Technion-Israel Institute of Technology Haifa Israel Department of Electrical Engineering Technion-Israel Institute of Technology Haifa Israel

The problem of recovering a signal from its power spectrum, called phase retrieval, arises in many scientific fields. One of many examples is ultra-short laser pulse characterization in which the electromagnetic field is oscillating with ∼ 1015 Hz and phase information cannot be measured directly due to limitations of the electronic sensors. Phase retrieval is ill-posed in most cases as there are many different signals with the same Fourier transform magnitude. To overcome this fundamental ill-posedness, several measurement techniques are used in practice. One of the most popular methods for complete characterization of ultra-short laser pulses is the Frequency-Resolved Optical Gating (FROG). In FROG, the acquired data is the power spectrum of the product of the unknown pulse with its delayed replica. Therefore the measured signal is a quartic function of the unknown pulse. A generalized version of FROG, where the delayed replica is replaced by a second unknown pulse, is called blind FROG. In this case, the measured signal is quadratic with respect to both pulses. In this letter we introduce and formulate FROG-type techniques. We then show that almost all band-limited signals are determined uniquely, up to trivial ambiguities, by blind FROG measurements (and thus also by FROG), if in addition we have access to the signals power spectrum. Copyright © 2017, The Authors. All rights reserved.

关键词： Power spectrum

Higher winding number in a non-unitary photonic quantum walk

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arXiv 2018年

作者： Xiao, Lei Qiu, Xingze Wang, Kunkun Bian, Zhihao Zhan, Xiang Obuse, Hideaki Sanders, Barry C. Yi, Wei Xue, Peng Beijing Computational Science Research Center Beijing100084 China Department of Physics Southeast University Nanjing211189 China Key Laboratory of Quantum Information University of Science and Technology of China CAS Hefei230026 China Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China CAS Hefei230026 China Department of Applied Physics Hokkaido University Sapporo060-8628 Japan Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China CAS Hefei230026 China Institute for Quantum Science and Technology University of Calgary ABT2N 1N4 Canada Program in Quantum Information Science Canadian Institute for Advanced Research TorontoONM5G 1M1 Canada State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai200062 China

Topological matter exhibits exotic properties yet phases characterized by large topological invariants are difficult to implement, despite rapid experimental progress. A promising route toward higher topological invariants is via engineered Floquet systems, particularly in photonics, where flexible control holds the potential of extending the study of conventional topological matter to novel regimes. Here we implement a one-dimensional photonic quantum walk to explore large winding numbers. By introducing partial measurements and hence loss into the system, we detect winding numbers of three and four in multi-step non-unitary quantum walks, which agree well with theoretical predictions. Moreover, by probing statistical moments of the walker, we identify locations of topological phase transitions in the system, and reveal the breaking of pseudo-unitary near topological phase boundaries. As the winding numbers are associated with non-unitary time evolution, our investigation enriches understanding of topological phenomena in non-unitary settings. Copyright © 2018, The Authors. All rights reserved.

关键词： Winding

Patterns of somatic structural variation in human cancer genomes (vol 578, pg 112, 2020)

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NATURE 2023年第7948期614卷 E38-E38页

作者： Li, Yilong Roberts, Nicola D. Wala, Jeremiah A. Shapira, Ofer Schumacher, Steven E. Kumar, Kiran Khurana, Ekta Waszak, Sebastian Korbel, Jan O. Haber, James E. Imielinski, Marcin Weischenfeldt, Joachim Beroukhim, Rameen Campbell, Peter J. Cancer Genome Project Wellcome Trust Sanger Institute Hinxton UK Totient Inc Cambridge MA USA Wellcome Sanger Institute Wellcome Genome Campus Hinxton UK Department of Haematology University of Cambridge Cambridge UK Cambridge University Hospitals NHS Foundation Trust Cambridge UK Korea Advanced Institute of Science and Technology Daejeon South Korea Department of Zoology Genetics and Physical Anthropology University of Santiago de Compostela Santiago de Compostela Spain Centre for Research in Molecular Medicine and Chronic Diseases (CIMUS) University of Santiago de Compostela Santiago de Compostela Spain The Biomedical Research Centre (CINBIO) University of Vigo Vigo Spain Centre for Research in Molecular Medicine and Chronic Diseases (CiMUS) Universidade de Santiago de Compostela Santiago de Compostela Spain Department of Zoology Genetics and Physical Anthropology (CiMUS) Universidade de Santiago de Compostela Santiago de Compostela Spain The Biomedical Research Centre (CINBIO) Universidade de Vigo Vigo Spain The Broad Institute of Harvard and MIT Cambridge MA USA Bioinformatics and Integrative Genomics Harvard University Cambridge MA USA Department of Cancer Biology Dana-Farber Cancer Institute Boston MA USA Broad Institute of MIT and Harvard Cambridge MA USA Department of Medical Oncology Dana-Farber Cancer Institute Boston MA USA Harvard Medical School Boston MA USA Massachusetts General Hospital Center for Cancer Research Charlestown MA USA Dana-Farber Cancer Institute Boston MA USA Department of Biostatistics and Computational Biology Dana-Farber Cancer Institute and Harvard Medical School Boston MA USA Weill Cornell Medical College New York NY USA Department of Physiology and Biophysics Weill Cornell Medicine New York NY USA Institute for Computational Biomedicine Weill Cornell Medicine New York NY USA Controlled Department and Institution New York NY USA Englander Institute for Precision Medicine Weill Cornell Medicine Ne

News and Commentaries: US Dollar is a “Hidden Variable” in the Sino-US Relations

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China and the World 2021年第1期4卷

作者： Da Hsuan Feng Haiming Liang Da Hsuan Feng is currently the Honorary Dean of Hainan University Belt and Road Research Institute and the Chief Advisor of China Silk Road iValley Research Institute. He grew up in Singapore and received his physics PhD from the University of Minnesota (1972). He was the M Russell Wehr Chair Professor of Drexel University. He also served as the United States National Science Foundation Program Director in Theoretical Physics for two years. Since 2002 Feng had taken roles as the Vice President for Research at the University of Texas at Dallas the Senior Vice President of National Cheng Kung University National Tsing Hua University in Taiwan and Special Advisor to the Rector and Director of Global Strategies of Macau University. Feng is a Fellow of the American Physical Society and had been the honorary professor of fifteen Chinese universities which includes Peking Union Medical College Fudan University Jilin University Huazhong University of Science and Technology and Chinese Academy of Sciences Institute of Applied Physics. Feng was the 2009 Bian-Zhong laureate for individuals with outstanding contributions to Hubei Province (2009). He was also the recipient of “The Light of Civilization the 2017 Chinese Cultural Exchange Award” (2017). Haiming Liang (Hoi Ming Leung) is the Dean of Hainan University Belt and Road Research Institute and Chairman of the China Silk Road iValley Research Institute one of the top three think-tanks of China today (there are now over 600) with offices in Hong Kong Guangzhou and Beijing. Within the Institute there are experts in all areas from economics to culture to technology from within China and foreign countries. Currently he is a Visiting Scholar at Princeton University. Liang is one of the new generation of economists of China today. He was invited by the Chinese Government as one of the few Chinese experts in the Belt and Road Forum for International Cooperation in 2017. He is also a columnist for Financial Times (Chinese edition) and a Financial Commentator of

DeePMD-kit: A deep learning package for many-body potential energy representation and molecular dynamics

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arXiv 2017年

作者： Wang, Han Zhang, Linfeng Han, Jiequn Weinan, E. Institute of Applied Physics and Computational Mathematics Fenghao East Road 2 Beijing100094 China CAEP Software Center for High Performance Numerical Simulation Huayuan Road 6 Beijing100088 China Program in Applied and Computational Mathematics Princeton University PrincetonNJ08544 United States Department of Mathematics and Program in Applied and Computational Mathematics Princeton University PrincetonNJ08544 United States Center for Data Science Beijing International Center for Mathematical Research Peking University Beijing Institute of Big Data Research Beijing100871 China

Recent developments in many-body potential energy representation via deep learning have brought new hopes to addressing the accuracy-versus-efficiency dilemma in molecular simulations. Here we describe DeePMD-kit, a package written in Python/C++ that has been designed to minimize the effort required to build deep learning based representation of potential energy and force field and to perform molecular dynamics. Potential applications of DeePMD-kit span from finite molecules to extended systems and from metallic systems to chemically bonded systems. DeePMD-kit is interfaced with TensorFlow, one of the most popular deep learning frameworks, making the training process highly automatic and efficient. On the other end, DeePMD-kit is interfaced with high-performance classical molecular dynamics and quantum (path-integral) molecular dynamics packages, i.e., LAMMPS and the i-PI, respectively. Thus, upon training, the potential energy and force field models can be used to perform efficient molecular simulations for different purposes. As an example of the many potential applications of the package, we use DeePMD-kit to learn the interatomic potential energy and forces of a water model using data obtained from density functional theory. We demonstrate that the resulted molecular dynamics model reproduces accurately the structural information contained in the original model. Copyright © 2017, The Authors. All rights reserved.

关键词： Potential energy

Width-dependent photoluminescence and anisotropic raman spectroscopy from monolayer MoS2Nanoribbons

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arXiv 2017年

作者： Wei, Guohua Lenferink, Erik J. Czaplewski, David A. Stern, Nathaniel P. Applied Physics Program Northwestern University 2145 Sheridan Road EvanstonIL60208 United States Department of Physics and Astronomy Northwestern University 2145 Sheridan Road EvanstonIL60208 United States Center for Nanoscale Materials Argonne National Laboratory 9700 S Cass Avenue ArgonneIL60439 United States

Single layers of transition metal dichalcogenides such as MoS2 are direct bandgap semiconductors with optical and electronic properties distinct from multilayers due to strong vertical confinement. Despite the fundamental monolayer limit of thickness, the electronic structure of isolated layers can be further tailored with lateral degrees of freedom in nanostructures such as quantum dots or nanoribbons. Although one-dimensionally confined monolayer semiconductors are predicted to have interesting size-and edge-dependent properties useful for spintronics applications, experiments on the opto-electronic features of monolayer transition metal dichalcogenide nanoribbons is limited. We use nanolithography to create monolayer MoS2 nanoribbons with lateral sizes down to 20 nm. The Raman spectra show polarization anisotropy and size-dependent intensity. The nanoribbons prepared with this technique show reduced susceptibility to edge defects and emit photoluminescence with size-dependent energy that can be understood from a phenomenological model. Fabrication of monolayer nanoribbons with strong exciton emission can facilitate exploration of low-dimensional opto-electronic devices with controllable properties. Copyright © 2017, The Authors. All rights reserved.

关键词： Monolayers

Reduced modeling of porous media convection in a minimal flow unit at large Rayleigh number

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arXiv 2018年

作者： Wen, Baole Chini, Gregory P. Department of Geological Sciences Jackson School of Geosciences University of Texas at Austin AustinTX78712 United States Institute of Computational Engineering and Sciences University of Texas at Austin AustinTX78712 United States Program in Integrated Applied Mathematics University of New Hampshire W113 Kingsbury Hall 33 Academic Way DurhamNH03824 United States Center for Fluid Physics University of New Hampshire DurhamNH03824 United States Department of Mechanical Engineering University of New Hampshire DurhamNH03824 United States

Direct numerical simulations (DNS) indicate that at large values of the Rayleigh number (Ra) convection in porous media self-organizes into narrowly-spaced columnar flows, with more complex spatiotemporal features being confined to boundary layers near the top and bottom walls. In this investigation of high-Ra porous media convection in a minimal flow unit, two reduced modeling strategies are proposed that exploit these specific flow characteristics. Both approaches utilize the idea of decomposition since the flow exhibits different dynamics in different regions of the domain: small-scale cellular motions generally are localized within the thermal and vorticity boundary layers near the upper and lower walls, while in the interior, the flow exhibits persistent large-scale structures and only a few low (horizontal) wavenumber Fourier modes are active. Accordingly, in the first strategy, the domain is decomposed into two near-wall regions and one interior region. Our results confirm that suppressing the interior high-wavenumber modes has negligible impact on the essential structural features and transport properties of the flow. In the second strategy, a hybrid reduced model is constructed by using Galerkin projection onto a fully a priori eigenbasis drawn from energy stability and upper bound theory, thereby extending the model reduction strategy developed by Chini et al. (Physica D, vol. 240, 2011, pp. 241-248) to large Ra. The results indicate that the near-wall upper-bound eigenmodes can economically represent the small-scale rolls within the exquisitely-thin thermal boundary layers. Relative to DNS, the hybrid algorithm enables over an order-of-magnitude increase in computational efficiency with only a modest loss of accuracy. Copyright © 2018, The Authors. All rights reserved.

关键词： Porous materials

Composition and structural studies of glass fertilizer

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Journal of physics: Conference Series 2018年第1期1120卷

作者： N Kiwsakunkran N Chanthima J Kaewkhao N. Sangwaranateec Physics Program Faculty of Science and Technology Nakhon Pathom Rajabhat University Nakhon Pathom 73000 Thailand Center of Excellence in Glass Technology and Materials science (CEGM) Nakhon Pathom Rajabhat University Nakhon Pathom 73000 Thailand Applied Physics Faculty of Science and Technology Suan Sunandha Rajabhat University Bangkok 10300 Thailand

Glass fertilizers are new type of advanced and controlled released fertilizer and made of glass matrixes with macro elements most useful for plants and also incorporated with microelements which are important to the growth and development of corps or plants. This study the glasses sample was prepared, which may be used as slow release fertilizer for different type of plant. All of samples were analyzed by using X-ray fluorescence (XRF), X-ray diffraction (XRD) and Fourier Transform Infrared (FTIR). The results of the experiments reported here demonstrate that is possible to adjust the release of phosphate from the fertilizer to phosphate demand of the plant.

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