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Ronchigram Simulation and Aberration Correction Training using ***

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1911-1912页

作者： Millsaps, William Sung, Suk Hyun Schnitzer, Noah Kourkoutis, Lena F. Hovden, Robert Engineering Physics Program University of Michigan Ann Arbor MI United States Department of Materials Science and Engineering University of Michigan Ann Arbor MI United States Department of Materials Science and Engineering Cornell University Ithaca NY United States School of Applied and Engineering Physics Cornell University Ithaca NY United States Kavli Institute at Cornell for Nanoscale Science Cornell University Ithaca NY United States

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Adaptive energy-preserving algorithms for guiding center system

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Plasma science and Technology 2023年第4期25卷 11-22页

作者：朱贝贝刘健张嘉炜祝爱卿唐贻发 Department of Applied Mathematics School of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing 100083Peopleʼs Republic of China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026Peopleʼs Republic of China Advanced algorithm Joint Lab Shandong Computer Science CenterQilu University of TechnologyJinan 250014Peopleʼs Republic of China The State Key Laboratory of Scientific and Engineering Computing The Institute of Computational Mathematics and Scientific/Engineering ComputingAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190Peopleʼs Republic of China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049Peopleʼs Republic of China

We develop two types of adaptive energy preserving algorithms based on the averaged vector field for the guiding center dynamics,which plays a key role in magnetized *** adaptive scheme is applied to the Gauss Legendre’s quadrature rules and time stepsize respectively to overcome the energy drift problem in traditional energy-preserving *** new adaptive algorithms are second order,and their algebraic order is carefully *** results show that the global energy errors are bounded to the machine precision over long time using these adaptive algorithms without massive extra computation cost.

关键词： guiding center system energy-preserving methods adaptive energy conservation

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Negative thermal expansion and phase transition of low-temperature Mg_(2)NiH_(4)

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Journal of Magnesium and Alloys 2023年第9期11卷 3338-3349页

作者： Qun Luo Qi Cai Qinfen Gu Yu Shi Bin Liu Xuan Quy Tran Syo Matsumura Tong-Yi Zhang Kazuhiro Nogita Tao Lyu Qian Li Fusheng Pan State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Materials Genome Institute Shanghai UniversityShanghai 200444China Australian Synchrotron ANSTO800 Blackburn RoadClaytonVictoria 3168Australia Department of Applied Quantum Physics and Nuclear Engineering Kyushu UniversityFukuoka 819-0395Japan Nihon Superior Centre for the Manufacture of Electronic Materials(NS CMEM) School of Mechanical and Mining EngineeringThe University of QueenslandBrisbaneQueensland 4072Australia National Engineering Research Center for Magnesium Alloy Chongqing UniversityChongqing 400044China

The negative thermal expansion(NTE) phenomenon is of great significance in fabricating zero thermal expansion(ZTE) materials to avoid thermal shock during heating and cooling. NTE is observed in limited groups of materials, e.g., metal cyanides, oxometallates, and metalorganic frameworks, but has not been reported in the family of metal hydrides. Herein, a colossal and continuous negative thermal expansion is firstly developed in the low-temperature phases of LT1-and LT2-Mg_(2)NiH_(4) between 488 K and 733 K from in-situ transmission electron microscope(TEM) video, with the volume contraction reaching 18.7% and 11.3%, respectively. The mechanisms for volume contraction of LT1 and LT2 phases are elucidated from the viewpoints of phase transformation, magnetic transition, and dehydrogenation, which is different from common NTE materials containing flexible polyhedra units in the structure. The linear volume shrinkage of LT2 in the temperature of 488-553 K corresponds to the phase transition of LT2→HT with a thermal expansion coefficient of -799.7 × 10^(-6) K^(-1) revealed by in-situ synchrotron powder X-ray diffraction. The sudden volume contraction in LT1 between 488 and 493 K may be caused by the rapid dehydrogenation of LT1 to Mg_(2)Ni. The revealed phenomenon in single composite material with different structures would be significant for preparing zero thermal expansion materials by tuning the fraction of LT1 and LT2 phases.

关键词： Negative thermal expansion Mg_(2)NiH_(4) Phase transformation In situ TEM In situ XRD

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AI Aided GPR Data Multipath Summation Using x-t Stacking Weights 47

AI Aided GPR Data Multipath Summation Using x-t Stacking Wei...

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47th International Conference on Telecommunications and Signal Processing, TSP 2024

作者： Nikos, Economou Sobhi, Nasir Said, Al Abri Al Shaqsi, Bader Hamdan, Hamdan School of Mineral Resources Engineering Technical University of Crete Applied Geophysics Lab Chania Greece Sultan Qaboos University College of Science Department of Earth Sciences Muscat Oman Sharjah University Petroleum Geosciences and Remote Sensing Program Department of Applied Physics and Astronomy United Arab Emirates

ISBN: (纸本)9798350365597

Migration velocity of Ground Penetrating Radar (GPR) data is a low wavenumber attribute crucial for migration. Obtaining a migration velocity model, which is considered closer to a Root Mean Square (RMS) model, from zero-offset (ZO) data requires analysis of the available diffractions whose density and (x, t) coverage is random. Thus, accuracy and efficiency of such a velocity model either for migration or its usage for interval velocity model estimation is not guaranteed. Here, with the aid of an Artificiaal Intelligence (AI) algorithm, which detects diffractions and usage of their kinematic information, we generate a diffraction velocity model used for the assignment of 2D weights for weighted multipath summation. The scope is to efficiently focus the scattered energy within a GPR section. We describe this methodology and demonstrate its application in enhancing the lateral continuity of reflections. We compare it with the multipath summation using lD weights with simulated data and present its application on marble assessment GPR data for imaging cracks in the subsurface structure. © 2024 IEEE.

关键词： Diffraction

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Endotaxial Polytype engineering: Enhancement of Incommensurate Charge Density Waves in TaS2

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1646-1647页

作者： Sung, Suk Hyun Kezer, Pat Agarwal, Nishkarsh Goh, Yin Min Schnitzer, Noah Baggari, Ismail El Sun, Kai Kourkoutis, Lena F. Heron, John T. Hovden, Robert Department of Materials Science and Engineering University of Michigan Ann Arbor MI United States Department of Physics University of Michigan Ann Arbor MI United States Department of Materials Science and Engineering Cornell University Ithaca NY United States Rowland Institute at Harvard University Cambridge MA United States Kavli Institute at Cornell for Nanoscale Science Ithaca NY United States School of Applied and Engineering Physics Cornell University Ithaca NY United States Applied Physics Program University of Michigan Ann Arbor MI United States

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The neutron activation analysis in studying the elemental ratios in marine mussels for assessment of the ecological characteristics

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The European Physical Journal Special Topics 2025年 1-10页

作者： Nekhoroshkov, P. Bezuidenhout, J. le Roux, R. Zinicovscaia, I. Yushin, N. Frontasyeva, M. Division of Nuclear Physics Frank Laboratory of Neutron Physics FLNP Sector NAA & Applied Research Joint Institute for Nuclear Research Dubna Russia School for Science and Technology Faculty of Military Science Stellenbosch University Stellenbosch South Africa Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering Bucharest Magurele Romania

The content of 24 elements (Na, Mg, Al, Cl, K, Ca, Sc, V, Ti, Cr, Mn, Fe, Co, Ni, Zn, As, Se, Br, Rb, Sr, Sb, I, Cs, Th, and U) was determined using neutron activation analysis in shells and soft tissues of mussels, collected from Namibia to Mozambique in the period 2013–2019. To assess the influence of low saline waters, special lithogenic structure of the coast and local wastewater discharges the mussel sets from the Black Sea and Saldanha Bay water areas were considerate as well. The As/Sc ratios in soft tissues could be used for indication of anthropogenic runoff regarding the terrigenous compounds. The ratios of elements in shell per soft tissue could be useful for demonstration of long-period accumulation in comparison with the short period. The Mg/Ca ratio in shells of mussels from the West coast was significantly higher in comparison with the samples from East coast indicated local hydrophysical features. Cl/Ca and Sr/Ca ratios in shells can indicate the salinity levels in surrounding waters. Na/Ca revealed higher levels of Na due to intensification of the river runoff on East coast. This agreed with the non-volatile Sc/Ca levels. The comparison of elemental levels in shells with respect to soft tissue (S/ST ratios) was discussed as useful indicator of temporary deposition rates of elements intake from soft tissue to shells. In general, such elements as Na, Mg, Al, Cl, K, Sc, Cr, Mn, Fe, Co, Ni, Zn, As, Se, Cs, and U revealed low S/ST levels, with the several exceptions, while Ca, V, Br, Sr, I, and Th showed high incorporation ratios (S/ST > 1) in several temporal cases, indicated the typical high levels of these elements in surrounding waters during the long period of accumulation. The wide range of S/ST ratio of I in mussels from the close bays indicated the seasonal fluctuations due to changes in hydrological structure and terrigenous runoff.

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EVALUATION OF SYRINGIC ACID-LOADED BORONIC ACID FUNCTIONALIZED MESOPOROUS SILICA PROPERTIES

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UPB Scientific Bulletin, Series B: Chemistry and Materials science 2024年第4期86卷 5-18页

作者： Ionita, Simona Deaconu, Mihaela Irimescu, Ionela Nicoleta Popescu, Roxana Cristina Mihailescu, Mona Sandu, Ana Maria Prundeanu, Mioara Savu, Diana Iulia Berger, Daniela Department of Inorganic Chemistry Physical-Chemistry & Electrochemistry National University of Science and Technology POLITEHNICA of Bucharest Romania CAMPUS Research Centre National University of Science and Technology POLITEHNICA of Bucharest Romania Applied Sciences Doctoral School National University of Science and Technology POLITEHNICA of Bucharest Tehnoplus Medical SRL Bucharest Romania Department of Life and Environmental Sciences "Horia Hulubei" National Institute for Research and Development in Physics and Nuclear Engineering Magurele Romania Department of Bioengineering and Biotechnology National University of Science and Technology POLITEHNICA of Bucharest Romania Department of Physics National University of Science and Technology POLITEHNICA of Bucharest Romania

Nanotechnology addresses a current issue in cancer treatment, the non-specificity of cytotoxic agents associated with severe side effects. Mesoporous silica-based systems emerged as promising drug delivery vehicles that can be modified to target tumoral cells in order to achieve a better therapeutic effect. Herein, MCM-41 silica was functionalized with a boronic acid derivative, as a targeting agent towards breast cancer cells, and loaded with syringic acid, a phenolic acid with a reported antitumoral potential. The resulting system’s cytotoxicity and internalization into cells were evaluated on breast cancer cells and compared to human fibroblasts. © 2024, Politechnica University of Bucharest. All rights reserved.

关键词： Mesopores

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Experiment validation of the high stability of long-term transmitted gamma photon counting of a new CdZnTe semiconductor detector and its preliminary applications

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Radiation Detection Technology and Methods 2022年第3期6卷 317-322页

作者： Chao Wang Yantao Liu Xiaopan Jiang Xianchao Huang Xiaoming Wang Yu Xiang Yiding Han Long Wei Zhiming Zhang Beijing Engineering Research Center of Radiographic Techniques and Equipment Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Jinan Laboratory of Applied Nuclear Science Jinan 250131China

Purpose To develop a detector system with high stability in counting the detection of transmitted gamma photons,which can be applied in the area of non-destructive *** We used the cadmium zinc telluride(CZT)detector with single-polarity electrodes to substitute the traditional scintillator detector and front-end read-out electronics based on our self-designed low-noise charge-sensitive ampliﬁ*** and conclusion The energy resolution of 662 keV from 137Cs radioactive source was improved to 1.9%,and the relative standard deviation of different total counts of transmitted photons detected decreased to 0.05%when the counts were more than 5×107,which means the impact from the statisticalﬂuctuation of long-term gamma photons counting will not be a main obstacle to achieving high precision in the area of non-destructive *** preliminary experiment of inspecting the inner gaps in the metal rodsﬁlled with samples also proved to have good prospects for the CZT detector in non-destructive testing.

关键词： Non-destructive testing NDT CZT detector High energy resolution

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Density functional theory investigation of electronic structure and muon hyperfine interaction in isolated adenine and thymine

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Interactions 2024年第1期245卷 1-14页

作者： Zaharim, Wan Nurfadhilah Sulaiman, Shukri Jamaludin, Ammaina Rozak, Harison Watanabe, Isao Department of Chemical Sciences Faculty of Science and Technology Universiti Kebangsaan Malaysia Selangor Bangi43600 Malaysia Nuclear Structure Research Group RIKEN Nishina Center for Accelerator Based Science 2-1 Hirosawa Wako Saitama351-0198 Japan Physics Section School of Distance Education Universiti Sains Malaysia Pulau Pinang Minden11800 Malaysia Computational Physics Laboratory School of Distance Education Universiti Sains Malaysia Pulau Pinang Minden11800 Malaysia Innovative Global Program College of Engineering Shibaura Institute of Technology Saitama337-8570 Japan

In DFT calculation, a basis set is an important factor in determining the quality of results, especially for hyperfine interaction where changes in the local geometry and electronic structure can have a big impact. The use of extensive basis sets is always desirable and is expected to produce better results. However, for DNA molecules of more than 10 base-pairs, all-electron geometry optimization calculation using large basis sets such as 6-311++G(d,p) is prohibitively difficult even on a supercomputer. An alternative is to use smaller basis sets such as 6-31G which is used in this work. Thus, the objective of the work reported here is to determine whether 6-31G basis set is suitable to be used to study muon hyperfine interaction in short DNA molecule. It is found that in comparison with 6-311++G(d,p), 6-31G does not change the ranking of muon sites stability in isolated adenine and thymine. Furthermore, the 6-31G calculated muon HFCCs are slightly closer to the experimental values. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Electronic structure

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Effects of sawtooth heat pulses on edge flows and turbulence in a tokamak plasma

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Plasma science and Technology 2023年第1期25卷 1-9页

作者：赵开君 Yoshihiko NAGASHIMA 郭志彬 Patrick H DIAMOND 董家齐严龙文 Kimitaka ITOH Sanae-I ITOH 李晓博李继全 Akihide FUJISAWA Shigeru INAGAKI 程钧许健强 Yusuke KOSUGA Makoto SASAKI 王正汹张怀强陈俞钱曹小岗余德良刘仪宋显明夏凡王硕 School of Nuclear Science and Engineer East China University of TechnologyNanchang 330013People's Republic of China Research Institute for Applied Mechanics Kyushu UniversityKasuga 816-8580Japan School of Physics Peking UniversityBeijing 100871People's Republic of China Center for Momentum Transport and Flow Organization University of California at San DiegoCalifornia 92093United States of America Southwestern Institute of Physics Chengdu 610041People's Republic of China Institute of Science and Technology Research Chubu UniversityAichi 487-8501Japan Research Center for Plasma Turbulence Kyushu UniversityKasuga 816-8580Japan National Institute for Fusion Science Toki 509-5292Japan Department of Innovative Energy Science and Engineering Graduate School of EngineeringChubu UniversityAichi 487-8501Japan Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People's Republic of China School of Physics and Optoelectronic Technology Dalian University of TechnologyDalian 116024People's Republic of China

Enhancements of edge zonal flows,radial electric fields,and turbulence are observed in electron cyclotron resonance heating-heated plasmas(Zhao et al 2013 *** 53083011).In this paper,the effects of sawtooth heat pulses on flows and turbulence are *** experiments are performed using multiple Langmuir probe arrays in the edge plasmas of the HL-2A *** edge zonal flows,radial electric fields,and turbulence are all enhanced by *** of the zonal flow and turbulence intensities is also *** delay time of the maximal intensity of the electric fields,zonal flows,and turbulence with respect to the sawtooth crashes is estimated as~1 ms and comparable to that of the sawtooth-triggered intermediate *** only the zonal flows but also the radial electric fields lag behind the ***,the intensities of both the zonal flows and electric fields nearly linearly increase/decrease with the increase/decrease of the turbulence intensity.A double-source predator-prey model analysis suggests that a relatively strong turbulence source may contribute to the dominant zonal flow formation during sawtooth cycles.

关键词： tokamak Langmuir probe arrays edge flows and turbulence sawtooth heat pulses

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