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probing the peripheral self-generated magnetic field distribution in laser-plasma magnetic reconnection with Martin-puplett interferometer polarimeter

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Chinese physics B 2024年第4期33卷 129-134页

作者：张雅芃姚嘉文刘正东马作霖仲佳勇 Department of Astronomy Beijing Normal UniversityBeijing 100875China institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China

Magnetic reconnection of the self-generated magnetic fields in laser-plasma interaction is an important laboratory method for modeling high-energy density astronomical and astrophysical *** use the Martin-puplett interferometer(MpI)polarimeter to probe the peripheral magnetic fields generated in the common magnetic reconnection configuration,two separated coplanar plane targets,in laser-target *** introduce a new method that can obtain polarization information from the interference pattern instead of the sinusoidal function fitting of the intensity.A bidirectional magnetic field is observed from the side view,which is consistent with the magneto-hydro-dynamical(MHD)simulation results of self-generated magnetic field *** find that the cancellation of reverse magnetic fields after averaging and integration along the observing direction could reduce the magnetic field strength by one to two orders of *** indicates that imaging resolution can significantly affect the accuracy of measured magnetic field strength.

关键词： laser-plasma experiment polarimeter self-generated magnetic field magnetic reconnection

Detecting short-term gravitational waves from post-merger hyper-massive neutron stars with a kilohertz detector

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Chinese physics B 2024年第8期33卷 222-228页

作者：陈奕康朱宗宏 institute for Frontier in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China Department of Astronomy Beijing Normal UniversityBeijing 100875China

Gravitational waves emanating from binary neutron star inspirals,alongside electromagnetic transients resulting from the aftermath of the GW170817 merger,have been successfully ***,the intricate post-merger dynamics that bridge these two sets of observables remain *** includes if,and when,the post-merger remnant star collapses to a black hole,and what are the necessary conditions to power a short gamma-ray burst,and other observed electromagnetic *** focus is on the detection of gravitational wave(GW)emissions from hyper-massive neutron stars(NSs)formed through binary neutron star(BNS)*** several kilohertz GW detectors,we simulate BNS mergers within the detection limits of LIGO-Virgo-kARGA *** objective is to ascertain the fraction of simulated sources that may emit detectable post-merger GW *** kilohertz detectors equipped with a new cavity design,we estimate that approximately 1.1%-32%of sources would emit a detectable post-merger GW *** fraction is contingent on the mass converted into gravitational wave energy,ranging from 0.01M_(sun)to 0.1M_(sun).Furthermore,by evaluating other well-regarded proposed kilohertz GW detectors,we anticipate that the fraction can increase to as much as 2.1%-61%under optimal performance conditions.

关键词： neutron star mergers gravitational waves

Design of Low-power Turbo Encoder and Decoder for NB-IoT

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Chinese Journal of Electronics 2024年第2期33卷 403-414页

作者： Chong ZHANG Yuhang LIN Deming WANG Jianguo HU School of Microelectronics Science and Technology Sun Yat-sen University School of physics and Telecommunication Engineering South China Normal University School of Electronics and Information Engineering South China Normal University Development research institute of Guangzhou Smart City Shenzhen research institute of Sun Yat-sen University

Turbo code is an error correction coding scheme close to the Shannon limit, usually used in wireless data transmission. Based on the parallel Turbo code algorithm, a parallel Turbo code circuit design scheme is *** the encoder, the recursive systematic convolutional encoder is multiplexed. The decoder is divided into branch metric, recursive, maximum likelihood ratio, and external information calculation modules. The decoding algorithm is based on Max-Log-MAp, controlling the component decoder in parallel. And the state metric calculation in the decoding circuit is combined to reduce the overall power consumption effectively, enabling the encoder and decoder to be used in narrowband Internet of things(NB-IoT). Finally, the hardware scheme of the main functional modules of Turbo code encoding and decoding is designed and implemented. The results show that the dynamic power consumption is less than 50 m W. The overall on-chip power consumption is reduced by 40% at the frequency of 125 MHz compared with previous jobs.

关键词： Measurement Wireless communication power demand Systematics Turbo codes System-on-chip power dissipation

An octopamine-specific GRAB sensor reveals a monoamine relay circuitry that boosts aversive learning

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National Science Review 2024年第5期11卷 186-201页

作者： Mingyue Lv Ruyi Cai Renzimo Zhang Xiju Xia Xuelin Li Yipan Wang Huan Wang Jianzhi Zeng Yifei Xue Lanqun Mao Yulong Li State key Laboratory of Membrane Biology School of Life SciencesPeking University State key Laboratory of Brain and Cognitive Science Institute of Biophysics Chinese Academy of Sciences pkU-IDG/Mc Govern institute for Brain research Yuanpei College Peking University p.k.ng-Tsinghua Center for Life Sciences Academy for Advanced Interdisciplinary Studies Peking University p.k.ng University–Tsinghua University–National institute of Biological Sciences Joint Graduate program Academy for Advanced Interdisciplinary Studies Peking University institute of Molecular physiology Shenzhen Bay Laboratory College of Chemistry Beijing Normal University Chinese institute for Brain research

Octopamine（OA）,analogous to norepinephrine in vertebrates,is an essential monoamine neurotransmitter in invertebrates that plays a significant role in various biological functions,including olfactory associative ***,the spatial and temporal dynamics of OA in vivo remain poorly understood due to limitations associated with the currently available methods used to detect *** overcome these limitations,we developed a genetically encoded GpCR activation-based（GRAB） OA sensor called *** sensor is highly selective for OA and exhibits a robust and rapid increase in fluorescence in response to extracellular *** GRABOA1.0,we monitored OA release in the Drosophila mushroom body（MB）,the fly's learning center,and found that OA is released in response to both odor and shock stimuli in an aversive learning *** OA release requires acetylcholine（ACh） released from kenyon cells,signaling via nicotinic ACh ***,we discovered that OA amplifies aversive learning behavior by augmenting dopamine-mediated punishment signals via Octβ1R in dopaminergic neurons,leading to alterations in synaptic plasticity within the ***,our new GRABOA1.0sensor can be used to monitor OA release in real time under physiological conditions,providing valuable insights into the cellular and circuit mechanisms that underlie OA signaling.

关键词： octopamine dopamine GRAB sensor learning and memory

Signifying quantum uncertainty relations by optimal observable sets and the tightest uncertainty constants

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Science China(physics,Mechanics & Astronomy) 2024年第9期67卷 43-50页

作者： Xiao-Bin Liang Bo Li Shao-Ming Fei School of Mathematics and Computer Science Shangrao Normal UniversityShangrao 334001China Quantum Information research Center Shangrao Normal UniversityShangrao 334001China School of Mathematical Sciences Capital Normal UniversityBeijing 100048China

Quantum uncertainty relations constrain the precision of measurements across multiple non-commuting quantum mechanical ***,we introduce the concept of optimal observable sets and define the tightest uncertainty constants to accurately describe these measurement *** any quantum state,we establish optimal sets of three observables for both product and summation forms of uncertainty relations,and analytically derive the corresponding tightest uncertainty *** demonstrate that the optimality of these sets remains consistent regardless of the uncertainty relation ***,the existence of the tightest constants excludes the validity of standard real quantum mechanics,underscoring the essential role of complex numbers in this ***,our findings resolve the conjecture posed in[***.118,180402(2017)],offering novel insights and potential applications in understanding preparation uncertainties.

关键词： uncertainty relation the tightest uncertainty constants optimal observable sets

Geometric properties of the first singlet S-wave excited state of two-electron atoms near the critical nuclear charge

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Chinese physics B 2024年第10期33卷 213-219页

作者： Tong Chen Sanjiang Yang Wanping Zhou Xuesong Mei d Haoxue Qiao School of physics and Technology Wuhan UniversityWuhan 430072China College of physics and Electronic Science Hubei Normal UniversityHuangshi 435002China School of physics and Telecommunications Huanggang Normal UniversityHuanggang 438000China Wuhan Maritime Communication research institute Wuhan 430072China

The geometric structure parameters and radial density distribution of 1s2s1S excited state of the two-electron atomic system near the critical nuclear charge Z_(c)were calculated in detail under tripled Hylleraas basis *** to the localized behavior observed in the ground and the doubly excited 2p^(23)pe states,for this state our results identify that while the behavior of the inner electron increasingly resembles that of a hydrogen-like atomic system,the outer electron in the excited state exhibits diffused hydrogen-like character and becomes perpendicular to the inner electron as nuclear charge Z approaches Z_(c).This study provides insights into the electronic structure and stability of the two-electron system in the vicinity of the critical nuclear charge.

关键词： critical nuclear charge two-electron atomic system geometric structure density distribution

Spatiotemporal pattern of climate change in the China-Myanmar Economic Corridor from 1901 to 2018

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Journal of Mountain Science 2024年第1期21卷 131-145页

作者： YANG Xiaoliu LI Yungang GAO Lu institute of Geography Fujian Normal UniversityFuzhou 350117China School of Geographical Sciences Fujian Normal UniversityFuzhou 350117China institute of International Rivers and Eco-Security Yunnan UniversityKunming 650500China Fujian provincial Engineering research Center for Monitoring and Accessing Terrestrial Disasters Fujian Normal UniversityFuzhou 350117China key Laboratory for Humid Subtropical Eco-geographical processes of the Ministry of Education Fujian Normal UniversityFuzhou 350117China

The China-Myanmar Economic Corridor(CMEC) is an important part of China's Belt and Road Initiative and an important area for global ecology and biodiversity. In this study, the annual and seasonal spatiotemporal patterns of temperature and precipitation in the CMEC over the past century were investigated using linear tendency estimation, the Mann-kendall mutation test, the T-test, and wavelet analysis based on the monthly mean climatic data from 1901 to 2018 released by the Climatic research Unit(CRU) of the University of East Anglia, Uk. The results show that the CMEC demonstrated a trend of warming and drying over the past 100 years, and the rate of change in Myanmar was stronger than that in Yunnan province of China. The warming rate was 0.039 ℃/10a. precipitation decreased at a rate of -6.1 mm/10a. From the perspective of spatial distribution, temperature was high in the central and southern, low in the north of the CMEC, and the high-temperature centers were mainly distributed in the southern plain and river valley. precipitation decreased from west to east and from south to north of the CMEC. From the perspective of the rate of change, warming was stronger in central and northern CMEC than in southern and northeastern CMEC. The rate of precipitation decline was stronger in the central and western regions than in the eastern region. This study provides a scientific reference for the CMEC to address climate change and ensure sustainable social and economic development and ecological security.

关键词： China-Myanmar Economic Corridor CRU Air temperature precipitation Spatiotemporal pattern

Clathrate structure of YB_(3)C_(3) for high-performance thermoelectrics with superior mechanical properties

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Journal of Materiomics 2024年第4期10卷 783-791页

作者： Yangfan Cui Shuai Duan Xiaojun Wang Qinghang Tang Jinyang Xi Xiaobing Liu Yongsheng Zhang Xin Chen Laboratory of High pressure physics and Material Science(HppMS) School of Physics and Physical EngineeringQufu Normal UniversityQufuShandong273165China Materials Genome institute Shanghai UniversityShanghai200444China Advanced research institute of Multidisciplinary Science Qufu Normal UniversityQufuShandong273165China

Exploring high-performance thermoelectric materials with improved mechanical properties is important for broadening the application scope and the assembly requirement of stable *** work presents an effective strategy to discover hard thermoelectric material by inserting foreign atoms in the rigid covalent *** demonstrate this in boron-carbon clathrate VII structure,showing a promising candidate for highly efficient thermoelectric energy conversion,especially with Y atom filled in the cage,with a peak zT of 0.73 at 1,000 *** ab initio calculations indicate that YB_(3)C_(3) system has low lattice thermal conductivity of 4.5 W/(m·k)at 1,000 k due to the strong rattling of encaged Y *** strongly covalent framework provides highly degenerate band structures consisting of heavy and light electron pockets,which can maintain high carrier mobility arising from small effective mass and thus large group ***,high power factor can be achieved in YB_(3)C_(3) for both electron and hole *** addition,it exhibits well mechanical properties and a Vickers hardness of 23.7 Gpa because of the strong covalent boron-carbon *** work provides a novel avenue for the search of high-performance thermoelectric materials with excellent mechanical properties,based on boron-carbon clathrate structure.

关键词： Clathrate structure Thermoelectric performance First-principles calculations Mechanical properties Thermal conductivity

Spatial patterns and Drivers of Intelligent Manufacturing from a ‘Global-local' perspective:A Study of China's Industrial Robotics

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Chinese Geographical Science 2024年

作者： LI Fengjiao ZHANG Hong JIANG Lili LIU Jiaming School of Architecture Tsinghua University institute of Geographical research Fujian Normal University College of Geography Science Harbin Normal University institute of Geographic Sciences and Natural Resources research Chinese Academy of Sciences

The advancement of the intelligent manufacturing industry(IMI) represents the future direction for the world's manufacturing sector, offering a promising avenue to bolster national competitiveness and enhance industrial manufacturing efficiency. In this study, we took the industrial robot industry(IRI) as a case study to elucidate the spatial distribution and interconnections of IMI from a geographical perspective, and the modified diamond model(DM) was used to analyze the influencing factors. Results show that: 1) the spatial pattern of IRI with various investment attributes in different industrial chain links is generally similar, centered in the *** investment areas are in the east and south. The spatial distribution of China's IRI covers a multitude of provinces and obtains different scales of investment in different countries(regions). 2) The spatial correlation between foreign investors and China's provinciallevel administrative regions(pARs) forms a network, and the network of foreign-invested enterprises is more stable. Different countries(regions) have distinct location preferences in China, with significant spatial differences in correlation degrees. 3) Overall, the interaction of these factors shapes the location decisions and correlation patterns of industrial robot enterprises. This study not only contributes to our theoretical knowledge of the industrial spatial structure and industrial economy but also offers valuable references and suggestions for national IMI planning and relevant industry investors.

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