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Alternating spin splitting of electronic and magnon bands in two-dimensional altermagnetic materials

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Chinese Physics B 2024年第9期33卷 194-198页

作者： Qian wang Da-Wei Wu Guang-Hua Guo Meng-Qiu Long yun-peng wang School of Physics Central South UniversityChangsha 410083China

Unconventional antiferromagnetism dubbed as altermagnetism was first discovered in rutile structured magnets,which is featured by spin splitting even without the spin–orbital coupling *** interesting phenomenon has been discovered in more altermagnetic *** this work,we explore two-dimensional altermagnetic materials by studying two series of two-dimensional magnets,including MF4 with M covering all 3d and 4d transition metal elements,as well as TS2 with T=V,Cr,Mn,*** the magnetic symmetry operation of RuF4 and MnS2,it is verified that breaking the time inversion is a necessary condition for spin *** on symmetry analysis and first-principles calculations,we find that the electronic bands and magnon dispersion experience alternating spin splitting along the same *** work paves the way for exploring altermagnetism in two-dimensional materials.

关键词： two-dimensional altermagnetic materials altermagnetism spin splitting first-principles calculations

Essential oil of Actinidia macrosperma, a catnip response kiwi endemic to China

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第9期7卷 708-712页

作者： ZHAO yun-peng wang Xiao-yun wang Zhi-can LU Yin FU Cheng-xin CHEN Shao-yuan Research Program for Medicinal Plant Resource Lab of Systematic ＆ Evolutionary Botany and Biodiversity School of Life Sciences Zhejiang University Hangzhou 310058. China

Objective: To identify compounds that may be responsible for catnip response of Actinidia macrosperma, and compare chemical compositions in the wild and in vitro regenerated plants. Methods: GC-MS and relative retention indices with n-alkanes as reference points were used for compound identification, and component relative percentage was calculated based on GC peak areas without using correction factors. Results: There are 28 compounds (92.72%) and 15 compounds (93.88%) identi- fied in the essential oils from the wild and regenerated plants, respectively. Dihydronepetalactone, iridomyrmecin, and dihydro- actinidiolide, which are believed to be attractive to felines, are present in both wild and regenerated plants. Actinine was not detected, and beta-pheylethyl alcohol was only present in wild plant. In addition, short-chain enol derivatives, messengers in chemical communication, are commonly present in wild plant of A. macrosperma, but absent in regenerated one. Conclusion: Dihydronepetalactone, iridomyrmecin, and dihydroactinidiolide are responsible for the catnip response of A. macrosperma.

关键词： Actinidia macrosperma GC-MS Dihydronepetalactone lridomyrmecin Dihydroactinidiolide Catnip response

Current development of body-centered cubic high-entropy alloys for nuclear applications

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Tungsten 2021年第2期3卷 197-217页

作者： Tan Shi peng-Hui Lei Xu Yan Jing Li yun-Di Zhou yun-peng wang Zheng-Xiong Su Yan-Kun Dou Xin-Fu He Di yun Wen Yang Chen-Yang Lu Department of Nuclear Science and Technology Xi’an Jiaotong UniversityXi’an 710049China China Institute of Atomic Energy Beijing 102413China

High-entropy alloys greatly expand the alloy design range and offer new possibilities for improving material *** on the worldwide research efforts in the last decade,the excellent mechanical properties and promising radiation and corrosion resistance of this group of materials have been ***-entropy alloys with body-centered cubic(BCC)structures,especially refractory high-entropy alloys,are considered as promising materials for high-temperature applications in advanced nuclear ***,the extreme reactor conditions including high temperature,high radiation damage,high stress,and complex corrosive environment require a comprehensive evaluation of the material properties for their actual service in nuclear *** review summarizes the current progress on BCC high-entropy alloys from the aspects of neutron economy and activation,mechanical properties,high-temperature stability,radiation resistance,as well as corrosion *** the current development of BCC high-entropy alloys for nuclear applications is still at an early stage as the large design space of this group of alloys has not been fully explored,the current research findings provide a good basis for the understanding and prediction of material behaviors with different compositions and *** in-depth understanding of the degradation mechanisms and characterization of material properties in response to conditions close to reactor environment are necessary.A critical down-selection of potential candidates is also crucial for further comprehensive evaluation and engineering validation.

关键词： Body-centered cubic high-entropy alloys Refractory high-entropy alloys Nuclear materials Radiation damage Tungsten

Contribution of moderate overall coal-bearing basin uplift to tight sand gas accumulation:case study of the Xujiahe Formation in the Sichuan Basin and the Upper Paleozoic in the Ordos Basin,China

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Petroleum Science 2015年第2期12卷 218-231页

作者： Cong-Sheng Bian Wen-Zhi Zhao Hong-Jun wang Zhi-Yong Chen Ze-Cheng wang Guang-Di Liu Chang-Yi Zhao yun-peng wang Zhao-Hui Xu Yong-Xin Li Lin Jiang Research Institute of Petroleum Exploration & Development CNPC College of Geosciences China University of Petroleum Guangzhou Institute of Geochemistry Chinese Academy of Sciences

Tight sand gas is an important unconventional gas resource occurring widely in different petroleum basins. In coal-bearing formations of the Upper Triassic in the Sichuan Basin and the Carboniferous and Permian in the Ordos Basin, coal measure strata and tight sandstone constitute widely distributed source-reservoir assemblages and form the basic conditions for the formation of large tight sand gas fields. Similar to most tight gas basins in North America, the Sichuan, and Ordos Basins, all experienced overall moderate uplift and denudation in Meso- Cenozoic after earlier deep burial. Coal seam adsorption principles and actual coal sample simulation experiment results show that in the course of strata uplift, pressure drops and desorption occurs in coal measure strata, resulting in the discharge of substantial free gas. This ac- counts for 28 %-42 % of total gas expulsion from source rocks. At the same time, the free gases formerly stored in the pores of coal measure source rocks were also dis- charged at a large scale due to volumetric expansion re- sulting from strata uplift and pressure drop. Based on experimental data, the gas totally discharged in the uplift period of Upper Paleozoic in the Ordos Basin, and Upper Triassic Xujiahe Formation in the Sichuan Basin is calcu- lated as （3-6） × 10^5 m^3/km^2. Geological evidence for gasaccumulation in the uplift period is found in the gas reservoir analysis of the above two basins. Firstly, natural gas discharged in the uplift period has a lighter carbon isotope ratio and lower maturity than that formed in the burial period, belonging to that generated at the early stage of source rock maturity, and is absorbed and stored in coal measure strata. Secondly, physical simulation experiment results at high-temperature and high-salinity inclusions, and almost actual geologic conditions confirm that sub- stantial gas charging and accumulation occurred in the uplift period of the coal measure strata of the two basins. Diffusiv

关键词： Sichuan Basin Ordos Basin Tight sand gasStratigraphic uplift Coalaccumulation mechanismmeasure Hydrocarbon Diffusion

Interaction between cisplatin,5-fluorouracil and vincristine on human hepatoma cell line (7721)

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World Journal of Gastroenterology 1998年第5期4卷 55-57页

作者： TANG Wei Xue, CHENG Ping Yan, LUO yun peng and wang Rui Xue

AIM To evaluate the killing effects of CDDP, 5-Fu and VCR on human hepaoma cell line (7721).METHODS The median-effect principle was *** Killing effects of the individual drug were enhanced as the median concentration increased. Antagonism was produced when two drugs were used at a higher concentration (CI＞1), and synergism was achiened when CI＜1. Finally, the effect was influenced by both the ratios of drug concentration and the sequence of *** The drug administration order and drug concentrations are significant factors that need to be considered in clinical *** combined chemotherapy for malignant carcinoma is desired to produce efficacious synergism between each drug, alleviate side effects of drugs and delay drug resistance. Clinically, the interaction (namely synergism, summation and antagonism) of different anticancer drugs in combination is usually evaluated by Chou-Talalay′s combination index (i.e., median-effect principle)[1-9]. In this paper the combination effect between Cisplatin (Cis), 5-Fluorouracil (5-Flu) and Vincristine (VCR) on human hepatoma cell line 7721, was analyzed in vitro.

关键词： liver neoplasms cisplatin 5 fluorouracil vincristine cell line

Optical Properties of C-rich(12C,SiC and FeC)Dust Layered Structure of Massive Stars

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Research in Astronomy and Astrophysics 2022年第3期22卷 133-142页

作者： Rui-Qing Wu Meng-Qiu Long Xiao-Jiao Zhang yun-peng wang Meng-Li Yao Ming-Ming Li Chun-Hua Zhu Guo-Liang Lü Zhao-Jun wang Ju-Jia Zhang Zhao wang Wu-Jin Chen School of Physics and Electronics Central South UniversityChangsha 410083China School of Physical Science and Technology Xinjiang UniversityUrumqi 830046China yunnan Observatories(YNAO) Chinese Academy of SciencesKunming 650216China School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004China School of Medicine Xinjiang Medical UniversityUrumqi 830011China

The composition and structure of interstellar dust are important and complex for the study of the evolution of stars and the interstellar medium(ISM).However,there is a lack of corresponding experimental data and model *** theoretical calculations based on ab-initio method,we have predicted and geometry optimized the structures of Carbon-rich(C-rich)dusts,carbon(^(12)C),iron carbide(Fe C),silicon carbide(Si C),even silicon(^(28)Si),iron(^(56)Fe),and investigated the optical absorption coefficients and emission coefficients of these materials in 0D(zero-dimensional),1D,and 2D *** the nebular spectra of the supernovae(SN)with the coefficient of dust,we find that the optical absorption coefficient of the 2D^(12)C,^(28)Si,^(56)Fe,Si C and Fe C structure corresponds to the absorption peak displayed in the infrared band(5–8)μm of the spectrum at 7554 days after the SN1987A *** also corresponds to the spectrum of 535 days after the explosion of SN2018bsz,when the wavelength was in the range of(0.2–0.8)and(3–10)μ***,2D Si C and Fe C correspond to the spectrum of 844 days after the explosion of SN2010jl,when the wavelength is within(0.08–10)μ***,Fe C and Si C may be the second type of dust in SN1987A corresponding to infrared band(5–8)μm of dust and may be in the ejecta of SN2010jl and *** nano-scale C-rich dust size is~0.1 nm in SN2018bsz,which is 3 orders of magnitude lower than the value of 0.1μ*** addition,due to the ionization reaction in the supernova remnant(SNR),we also calculated the Infrared Radiation(IR)spectrum of dust *** find that the cation of the 2D layered(Si C)^(2+)has a higher IR spectrum than those of the cation(Si C)^(1+)and neutral(Si C)^(0+).

关键词： stars:carbon (ISM:)dust extinction ISM:abundances

Cooperative channel assignment for VANETs based on multiagent reinforcement learning

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Frontiers of Information Technology & Electronic Engineering 2020年第7期21卷 1047-1058页

作者： yun-peng wang Kun-xian ZHENG Da-xin TIAN Xu-ting DUAN Jian-shan ZHOU Beijing Advanced Innovation Center for Big Data and Brain Computing School of Transportation Science and EngineeringBeihang UniversityBeijing 100191China

Dynamic channel assignment(DCA)plays a key role in extending vehicular ad-hoc network capacity and mitigating ***,channel assignment under vehicular direct communication scenarios faces mutual influence of large-scale nodes,the lack of centralized coordination,unknown global state information,and other *** solve this problem,a multiagent reinforcement learning(RL)based cooperative DCA(RLCDCA)mechanism is ***,each vehicular node can successfully learn the proper strategies of channel selection and backoff adaptation from the real-time channel state information(CSI)using two cooperative RL *** addition,neural networks are constructed as nonlinear Q-function approximators,which facilitates the mapping of the continuously sensed input to the mixed policy *** are driven to locally share and incorporate their individual rewards such that they can optimize their policies in a distributed collaborative *** results show that the proposed multiagent RL-CDCA can better reduce the one-hop packet delay by no less than 73.73%,improve the packet delivery ratio by no less than 12.66%on average in a highly dense situation,and improve the fairness of the global network resource allocation.

关键词： Vehicular ad-hoc networks Reinforcement learning Dynamic channel assignment Multichannel

CaH2-promoted activity of Ni-carbonate interface for CO2 methanation

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Journal of Energy Chemistry 2025年第1期100卷 522-532页

作者： Jin-peng wang Guo-Cui Mao Hui-Lin Jiang Bao-Xia Dong yun-Lei Teng School of Chemistry and Chemical Engineering Yangzhou University

Transition metal-carbonate interfaces often act as active sites in heterogeneous catalytic *** interface between transition metal and metal carbonate exhibits a dynamic equilibrium during the CO2hydrogenation reaction,involving surface carbonate hydrogenation and ***,there have been few reports on engineering the activity of the interface between transition metal and alkaline earth metal carbonate for catalytic *** work demonstrated that the incorporation of CaH2in Ni/CaCO3enhances the CO2methanation activity of the *** CO2conversion for Ni/CaH2-CaCO3reached 68.5%at 400°C,which was much higher than that of the Ni/CaCO3（31.6%） and Ni/CaH2-CaO （42.4%） ***,the Ni/CaH2-CaCO3catalysts remained stable during the stability test for 24 h at 400°C and 8 *** research revealed that CaH2played a crucial role in promoting the activity of the Ni-carbonate interface for ***2could modify the electronic structure of Ni and tune the structural properties of CaCO3to generate medium basic sites （OH groups）,which are favorable for the activation of H2and ***-situ Fourier transform infrared spectroscopy （FTIR） analysis combined with density functional theory calculations demonstrated that CO2activation occurs at the hydroxyl group （OH） on the CaH2-modified Ni-carbonate surface,leading to the formation of CO3H****,our study has confirmed that CO2methanation over the Ni/CaH2-CaCO3catalysts proceeds via the formate pathway.

关键词： Metal hydride Ni catalysts Carbonate Metal-carbonate interface

Chromosome-level genome assembly of the dotted gizzard shad(Konosirus punctatus) provides insights into its adaptive evolution

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Zoological Research 2022年第2期43卷 217-220页

作者： Bing-Jian Liu Kun Zhang Shu-Fei Zhang Yi-Fan Liu Jia-Sheng Li Ying peng Xun Jin yun-peng wang Si-Xu Zheng Li Gong Li-Qin Liu Zhen-Ming Lu National Engineering Laboratory of Marine Germplasm Resources Exploration and Utilization Zhejiang Ocean UniversityZhoushanZhejiang 316022China Guangdong Provincial Key Laboratory of Fishery Ecology and Environment South China Sea Fisheries Research InstituteChinese Academy of Fisheries SciencesGuangzhouGuangdong 510300China National Engineering Research Center for Facilitated Marine Aquaculture Marine Science and Technology CollegeZhejiang Ocean UniversityZhoushanZhejiang 316022China

Konosirus punctatus is an economically important marine fishery resource and is widely distributed from the Indian to Pacific *** is a good non-model species for genetic studies on salinity and temperature ***,a high-... 详细信息

关键词： salinity Indian evolution