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Orbitronics for energy-efficient magnetization switching

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Science China(Information Sciences) 2025年第1期 398-399页

作者： Yuxuan YAO Daoqian ZHU Qingtao xiA Jianing LIANG Yuhao JIANG Zhiyang PENG Jiaxu LI Chen xiAO Renyou XU Wenwen WANG xiantao SHANG Shiyang lu Dapeng ZHU Hong-xi LIU Kaihua CAO Weisheng ZHAO Fert Beijing Institute School of Integrated Circuit Science and Engineering Beihang University National Key Lab of Spintronics Institute of International Innovation Beihang University Qingdao Research Institute Beihang University Truth Memory Corporation

Spin-orbit torque （SOT）,as a promising writing method for magnetic random-access memory （MRAM）,has garnered widespread interest for over a decade [1].Heavy metals,such as β-W,have been broadly adopted as spin current sources,but suffer from phase change at a limited thickness,resulting in a dramatic reduction of the charge-tospin conversion efficiency θSH[2].The thickness limitation leads to stringent etching conditions and large distribution among devices,posing challenges for simultaneously satisfying SOT efficiency,etching-stop margins,and back-end-ofline （BEOL） compatibility.

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Advances in ethnopharmacology,phytochemistry and pharmacology of Erigerontis Herba and its Chinese medicine prescriptions

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Traditional Medicine Research 2025年第1期10卷 44-61页

作者： Yang Zhou Yuan-Yan Huang Ding-Yue Shang Ying Chen Meng Tian Cheng-Yu Jin xin lu Bing-chun Yan Han-Qing Pang Institute of Translational Medicine School of MedicineYangzhou UniversityYangzhou 225009China Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases Yangzhou UniversityYangzhou 225009China School of Medicine Nanjing University of Chinese MedicineNanjing 210023China State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources Guangxi Normal UniversityGuiling 541004China.

Erigerontis Herba(EH),the dried whole plant of Erigeron breviscapus,is well-known for circulating blood,activating meridians to alleviate pain,expelling wind,and clearing away *** has been extensively utilized in southern China for the treatment of stroke hemiplegia,chest stuffiness and pains,rheumatic arthralgia,headache,and *** review focuses on the botany,ethnopharmacology,phytochemistry,pharmacology and toxicity of EH and its related prescriptions to offer new insights for prospective research of *** information about EH was retrieved from ancient records and books,PubMed,China National Knowledge Infrastructure,Chinese Pharmacopoeia,Web of Science,Doctoral and Master’s Theses,and various electronic *** is a member of Compositae family and is mainly grown in southern *** Chinese medicine records that EH has the effects of circulating blood and removing blood stasis,expelling wind,and removing cold,as well as relieving rigidity of muscle and relieving *** now,nearly 200 ingredients have been characterized from EH,including flavonoids,caffeoyls,aromatic acids,coumarins,pentacyclic terpenoids,volatile oil and other *** extracts,EH related prescriptions(Dengzhan xixin injection,Dengzhan Shengmai capsules,etc.)or compounds(scutellarin,scutellarein,etc.)possessed obvious therapeutic effects of ischemic stroke,cerebral hemorrhage,myocardial infarction,Alzheimer’s disease,diabetes and its complications,gastric cancer,bone,and joint degenerative ***,the major active compound of EH,has been used as a quality *** no obvious toxicity of EH has been *** to its traditional applications,ethnopharmacology,phytochemistry,pharmacology,and toxicity,EH was applied as a valuable herb for clinical application in food and medicine *** several compounds have been shown to possess diverse biological activities,the underlying mechanisms of their actions remain *** fully exploi

关键词： Erigeron breviscapus traditional applications ethnopharmacology phytochemistry pharmacology

Flutter of Finite-Span Flexible Plates in Uniform Flow

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Chinese Physics Letters 2010年第6期27卷 126-128页

作者： BAO chun-Yu TANG Chao YIN xie-Zhen lu xi-Yun Department of Modern Mechanics University of Science and Technology of China Hefei 230027

The flutter instability and response of finite-span flexible plates in uniform flow are investigated experimentally. The effects of the plate aspect ratio on its dynamic responses are mainly analyzed. A hysteretic phenomenon is observed and can be described such that the plate flutters spontaneously as the flow velocity is greater than a critical value UC and the plate returns to its stable state as the flow velocity is slowly decreased to another critical one UD. We find that the aspect ratio has a greater effect on UC than on UD. The flutter frequency decreases and the amplitude increases with the increase in the flow velocity. When the flutter instability of the plate occurs, three typical flutter modes are identified and are associated with the aspect ratio and the flow velocity.

关键词： FluTTER (Aerodynamics) PLATES (Engineering) AERODYNAMICS HYSTERESIS FluID dynamics

Formation and Destiny of White Dwarf and Be Star Binaries

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Research in Astronomy and Astrophysics 2023年第2期23卷 262-274页

作者： chun-Hua Zhu Guo-Liang Lü xi-Zhen lu Jie He School of Physical Science and Technology Xinjiang UniversityUrumqi 830046China xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China

The binary systems consisting of a Be star and a white dwarf(Be WDs) are very *** can originate from the binaries composed of a Be star and a subdwarf O or B star(Besd OBs),and they can merge into red giants via luminous red nova or can evolve into double WD potentially detected by the LISA *** the method of population synthesis,we investigate the formation and the destiny of Be WDs,and discuss the effects of the metallicity(Z) and the common envelope evolution *** find that Besd OBs are significant progenitors of Be *** 30%(Z = 0.0001)-50%(Z = 0.02) of Be WDs come from Besd *** 60%(Z = 0.0001)-70%(Z = 0.02) of Be WDs turn into red giants via a merger between a WD and a non-degenerated *** 30%(Z = 0.0001)-40%(Z = 0.02) of Be WDs evolve into double WDs which are potential gravitational waves of the LISA mission at a frequency band between about 3 × 10^(-3)and 3 × 10^(-2)*** common envelope evolution parameter introduces an uncertainty with a factor of about 1.3 on Be WD populations in our simulations.

关键词： (stars:)binaries(including multiple) close-stars evolution-stars rotation-(stars:)white dwarfs

Quality of service aware admission control in cognitive device-to-device network

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The Journal of China Universities of Posts and Telecommunications 2011年第5期18卷 22-29,36页

作者： FU Zi-xi HU chun-jing PENG Tao lu Qian-xi WANG Wen-bo Wireless Signal Processing and Network Lab Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

A hybrid system of cellular mode and device-to-device （D2D） mode is considered in this paper, where the cellular resource is reused by the D2D transmission. With the objective of capacity maximization, the power optimization of D2D sub-system is considered, taking into account quality of service （QoS） requirement. The power optimization problem is divided into two stages： The first stage is the admission control scheme design based on the QoS requirement of D2D users, and the second is power allocation to maximize aggregate throughput of admissible D2D users. For the D2D admission control problem, a heuristic sorting-based algorithm is proposed to index the admissible D2D links, where gain to Interference ratio （GIR） sorting criterion is used. Applying an approximate form of Shannon capacity, the power allocation problem can be solved by convex optimization and geometric programming tools efficiently. Based on the theoretical analysis, a practical algorithm is proposed. The precision can reach a trade-off between complexity and performance. Numerical simulation results confirm that combining with GIR sorting method, the proposed scheme can significantly improve the D2D system＇s capacity and fairness.

关键词： cognitive radio QoS power control geometric programming sorting-based algorithm

Forest soil conservation based on eco-service provision unit method and its value in Anji County,Huzhou,Zhejiang,China

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Journal of Forestry Research 2015年第2期26卷 405-415页

作者： Biao Zhang Ji-xi Gao Gao-di xie chun-xia lu Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Science Nanjing Institute of Environmental Sciences Ministry of Environmental Protection

We propose an eco-service provision unit method for estimating the benefit and spatial differences of forests in controlling soil erosion.A total of 197 eco-service provision units were grouped on 1424.43 km2 of forest according to differences in vegetation,slope,soil,and *** amount of soil conservation and its economic value were *** forests in Anji County prevent4.08 9 105 tons of soil from eroding annually,thereby avoiding 1.36 9 104 tons of nutrient loss（on-site cost） and preventing 149 tons of nutritive elements from entering water systems（off-site cost）.From an economic perspective,the soil nutrient conservation in the forests of Anji County generated an annual benefit of 43.37 million RMB（Chinese Currency,6.20 RMB = US$1）.On average,each hectare of ecological forest contributed up to 436 RMB annually because of soil *** complexes with higher rainfall intensity,such as broadleaf forest and red soil on slope gradients [25°,contributed the highest soil conservation *** study identified and quantified the dominant contributors and magnitudes of soil conservation provided by *** information can benefit decision making regarding differentiated ecological compensation policies.

关键词： Soil erosion and conservation Eco-service provision unit(ESPU) Rainfall erosivity Soil erodibility Universal Soil Loss Equation(USLE)

Carbon nanotubes/graphitic carbon nitride nanocomposites for all-solid-state supercapacitors

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Science China(Technological Sciences) 2020年第9期63卷 1714-1720页

作者： lu Chao CHEN xi Deparment of Earth and Environmental Engineering Columbia UniversityNew York 10027USA School of Chemical Engineering.Northwest University Xi'an 710069China

All-solid-state supercapacitors with high power density and working stability are high-efficiency energy storage devices for smart electronic equipment. Developing electrode materials with fast ions and electrons transport is critical to improving the energy storage capability. Here, we report carbon nanotubes/graphitic carbon nitride nanocomposites with large specific surface area, porous structure and high electrical conductivity toward high-performance supercapacitors. The large surface area with porosity provides reservoir for ion accommodation during charge-discharge processes, and the high conductivity facilitates electrons and ions transport. Furthermore, nitrogen sites in electrodes contribute significant pseudocapacitance for supercapacitors. The nanocomposites based device gives a high specific capacity of 148 F g^(–1) at current density of 1 A g^(–1) with good rate capability from 1 to 10 A g^(–1). Additionally, the device displays excellent working stability with capacitance retention of 93%even after 10000 cycles at 1 A g^(–1) under 0.8 V in air. This study sheds light on design of nanocomposites with highly efficient charge transfer and will accelerate development of next-generation solid state energy devices.

关键词： carbon nanotubes graphitic carbon nitride nanocomposite nitrogen doping high capacity supercapacitors

Natural aging mechanism of buried polyethylene pipelines during long-term service

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Petroleum Science 2023年第5期20卷 3143-3156页

作者： Ying-chun Chen Yan-Feng Li Yan xi Qiang Li Qi lu Jie Yang Beijing University of Technology Beijing100124China xinjiang Inspection Institute of Special Equipment Urumqi830011XinjiangChina

Currently,accelerated aging tests are widely used to study the aging process of polyethylene ***,this approach can only simulate one or several main influencing factors in the natural environment,which are often quite different from the actual environment of the buried *** this study,five types of PE80 buried pipelines in service for 9e18 years were taken as the research object,while new PE80 pipelines were taken as the reference *** aging process and mechanism of polyethylene buried pipelines were studied through mechanical and chemical property tests and microstructural *** results showed that the pipeline exhibited cross-linking as the main aging mechanism after being in service for 0e18 *** aging degree and law of the inner and outer surface of the pipeline were compared,and the observed mechanism of both surfaces was *** 18 years in service,the elongation at the break of the pipe decreased by 16.2%,and the toughness of the matrix in the main collapse area of the tensile sample was the fundamental reason responsible for changes in the mechanical ***,after 18 years in service,the oxidation induction time of the pipeline was 25.7 min,which was 28.5% higher than the national standard *** were no potential safety hazards during continuous long-term *** results of this paper provide reference data and theoretical guidance for the aging process study of buried polyethylene pipelines.

关键词： Polyethylene Buried pipelines Long-term service Natural aging

Localized molecular orbital studies of certain compounds with [A_3X_3] six-membered rings

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Chinese Journal of Chemistry 1993年第6期11卷 481-489页

作者： LI Jun LIU chun-Wan lu Jia-xi Fujian Institute of Research on the Structure of Matter Chinese Academy of SciencesState Key Laboratory of Structural ChemistryFuzhouFujian 350002

The localized molecular orbitals (LMOs) of certain quasi-aromatic organic and inor- ganic molecules with six-membered rings have been calculated by virtue of the ab initio method using STO-3G and 4-31G basis sets as well as the CNDO/2 method. It is shown that there exists extensively-delocalized p-pπ bonding in these quasi-aromatic systems. The localized pictures of the π-type LMOs for the heterocyclic and homocyclic systems from the σ-π localization scheme are discussed. The Generator Orbital approach is utilized to account for the bonding patterns.

关键词： six-membered rings Localized molecular orbital studies of certain compounds with A3X3