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The earliest evidence for a microblade adaptation in the remote,high altitude regions of the Tibetan Plateau

Science China Earth Sciences 2024年第5期67卷 1561-1573页

作者： Yingshuai JIN Xiaoling ZHANg Shejiang wa.g Junyi gE wei HE wa da Yunyao TAN Ziyi YANg Christopher MORgAN Xing gAO Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of SciencesBeijing 100044China University of the Chinese Academy of Sciences Beijing 100049China Cultural Relics Conservation Institute of the Xizang Autonomous Region Lhasa 850000China Nagqu Culture and Tourism Bureau Nagqu 852000China University of Nevada Reno 89557USA

Microblade assemblages are among the most common prehistoric archaeological materials found on the Tibetan Plateau(TP)and are thought to indicate large scale migration to and settlement of the *** microblade sites,however,have been systematically excavated,especially in the remotest,highest-elevation regions of the *** timing of the large-scale arrival,spread,and permanent settlement of people on the TP therefore remains *** this paper,we report on a recently excavated site,Locality 3 of the Nwya Devu Site(ND3),located at 4600 meters above sea level(masl),near the shore of Ngoin Lake,on the interior *** analyses reveal a fairly typical microblade technological orientation and two types of microblade cores:wedge-shaped and semi-conical,which are similar to those found throughout North *** Optically Stimulated Luminescence(OSL)dating and AMS^(14)C dating,the age of ND3 ranges from 11 to 10 *** date range indicates ND3 is the oldest microblade site yet recorded in the remote,high-elevation regions of the TP and thus provides important information about when and how hunter-gatherers using microblades began exploiting the higher altitudes of the *** together,studies at ND3 and throughout the TP suggest that a microblade adaptation is associated with the first prolonged human occupation of the plateau and that microblades played a significant role in mediating the risks and facilitating the mobility necessary to permanently inhabit the TP.

关键词： The interior of Tibetan Plateau Nwya Devu locality 3 Microblade Early Holocene High altitude adaption

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Numerical investigation on the effects of current headings on vortex induced motions of a semi-submersible

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Journal of Hydrodynamics 2022年第3期34卷 382-394页

作者： wei-wen Zhao Zhi-yuan wei De-cheng wa Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Marine Design&Research Institute of China Shanghai200011China Ocean College Zhejiang UniversityZhoushan316021China

In this paper,numerical simulations on vortex-induced motions(VIM)of a semi-submersible at two different current headings are conducted over a wide range of current *** simulations are performed with the computational fluid dynamics(CFD)solver VIM-FOAM-SJTU which is an in-house solver developed based on the OpenFOAM *** turbulent flows are resolved with a shear stress transport-delayed detached eddy simulation(SST-DDES)*** decay tests for transverse and yaw motion are performed in calm still water to make sure the equivalent stiffness is setup *** the results of VIM,including motion response,forces and moments,and flow patterns are presented and analyzed *** including transverse,in-line and yaw motion at different current headings and velocities are *** vorticity in the wake regions at different time stamps are also illustrated for different current headings and velocities.

关键词： Vortex-induced motions(VIM) vortex-induced yaw vim-FOAM-SJTU solver Reynolds stress

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Electrochemical properties of niobium and phosphate doped spherical Li-rich spinel LiMn2O4 synthesized by ion implantation method

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Chinese Chemical Letters 2017年第7期28卷 1438-1446页

作者： wei Li gao-wa Siqin Zhi Zhu Lu Qi Wen-Huai Tian Department of Materials Physics and Chemistry School of Materials Science and EngineeringUniversity of Science and TechnologyBeijing 100083China New Energy Materials and Technology Laboratory Department of Applied ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Spherical Li-rich lithium manganese oxide（LMO） spinel material was synthesized by an ion implanted method assisted by polyalcohol doped with Niobium and Phosphate *** material was characterized by scanning electron microscopy,X-ray diffraction and BET specific surface area *** electrochemical performances were investigated with galvanostatic techniques and cyclic *** synthesis process was investigated with Tg/*** results show that the lithium ion can be immersed into the pore of manganese dioxide at a low temperature with the ion implanted *** prepared materials have a higher discharge capacity and better crystallization than those prepared by solid phase *** doped Nb can improve the capacity of the Li-rich LMO spinel and reinforce the crystal growth along（111） and（400） *** crystal grains show circular and smooth morphology,which makes the specific surface area greatly ***-doped LMO spinel exhibits good high-rate capacity and structure *** prepared Li（1.09）Mn（1.87）Nb（0.031）O（3.99）（PO4）（0.021）delivers a discharge capacity of 119mAhg^-1 at 0.2C（1C=148mAg^-1） and 112.8 mAhg^-1 at 10 C,the discharge capacity retention reaches 98% at 1 ℃ after 50 cycles at 25 ℃ and 94% at 55 ℃.

关键词： Spinels Ion implantation Li-ion batteries LiMn2O4 Doping

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Establishment of a Tumor-bearing Mouse Model Stably Expressing EgFP Labeled Human MUC1 VNTRs

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Chemical Research in Chinese Universities 2008年第4期24卷 505-510页

作者： ZHANg Shu-zi ZHANg Hai-hong ZHANg wa SHI He-liang YU Xiang-hui KONg wei LI wei Vaccine Research Center College of Life Science Jilin University Changchun 130012 P R. China

Two eukaryotic vectors expressing 9 tandem repeats of human MUCI（VNTR）, VR1012-VNTR, and pEgFP-VNTR, were constructed by cloning VNTR gene into VR1012 and pEgFP, respectively. VNTR stably expressing murine Lewis lung carcinoma（LLC） cell line（VNTR^＋ LLC） was established by Lipofectamine-mediated transfection of pEgFP-VNTR into LLC cells. The EgFP expression was observed under a fluorescent microscope and VNTR expression in VNTR^＋ LLC cells was confirmed by means of Western blotting. A syngenic graft tumor model was generated by subcutaneous injection of VNTR^＋ LLC cells into C57/BL6 mice and tumor size increased rapidly with time and in a cell qumber dependent manner. VNTR mRNA expression in the tumor formed was confirmed by RT-PCR. After the third immunization mice were challenged subcutaneously with 5×10^5 VNTR^＋ LLC cells, a significant reduction of subcutaneous tumor growth was observed in the groups immunized with VNTR plasmid DNA compared with that in the groups immunized with the vector DNA alone. Thus, the suppression of subcutaneous tumor was antigen-specific. This model is useful for the development of tumor vaccines targeting MUCI VNTRs.

关键词： MUCI VNTR Tumor antigen Tumor model Tumor vaccine

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Molecular Structure Tailoring of Organic Spacers for High‑Performance Ruddlesden–Popper Perovskite Solar Cells

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Nano-Micro Letters 2025年第2期17卷 314-357页

作者： Pengyun Liu Xuejin Li Tonghui Cai wei Xing Naitao Yang Hamidreza Arandiyan Zongping Shao Shaobin wa.g Shaomin Liu School of Materials Science and Engineering State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum(East China)Qingdao 266580People’s Republic of China School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 255049People’s Republic of China Centre for Applied Materials and Industrial Chemistry(CAMIC) School of ScienceRMIT UniversityMelbourneVic 3000Australia wa School of Mines:Minerals Energy and Chemical Engineering(WASM‑MECE)Curtin UniversityPerthWA 6102Australia School of Chemical Engineering The University of AdelaideAdelaideSA 5005Australia School of Engineering Great Bay UniversityDongguan 523000People’s Republic of China

Layer-structured Ruddlesden–Popper(RP)perovskites(RPPs)with decent stability have captured the imagination of the photovoltaic research community and bring hope for boosting the development of perovskite solar cell(PSC)***,two-dimensional(2D)or quasi-2D RP PSCs are encountered with some challenges of the large exciton binding energy,blocked charge transport and poor film quality,which restrict their photovoltaic ***,these issues can be readily resolved by rationally designing spacer cations of *** review mainly focuses on how to design the molecular structures of organic spacers and aims to endow RPPs with outstanding photovoltaic *** firstly elucidated the important roles of organic spacers in impacting crystallization kinetics,charge transporting ability and stability of *** we brought three aspects to attention for designing organic ***,we presented the specific molecular structure design strategies for organic spacers of RPPs aiming to improve photovoltaic performance of RP *** proposed strategies in this review will provide new avenues to develop novel organic spacers for RPPs and advance the development of RPP photovoltaic technology for future applications.

关键词： Ruddlesden-Popper perovskites Low-dimensional perovskite solar cells Organic spacers Molecular structure Design strategies

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Method of evaluating interface traps in Al2O3/AlgaN/gaN high electron mobility transistors

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Chinese Physics B 2019年第6期28卷 378-383页

作者： Si-Qin-gao-wa Bao Xiao-Hua Ma wei-wei Chen Ling Yang Bin Hou Qing Zhu Jie-Jie Zhu Yue Hao School of Advanced Materials and Nanotechnology Xidian UniversityXi’an 710071China Key Laboratory of Wide Band-gap Semiconductor Materials and Devices School of MicroelectronicsXidian UniversityXi’an 710071China School of Science Inner Mongolia University of TechnologyHohhot 010051China 4China Academy of Space Technology(Xi’an)Xi’an 710071China

In this paper, the interface states of the AlgaN/gaN metal–insulator–semiconductor(MIS) high electron mobility transistors(HEMTs) with an Al2 O3 gate dielectric are systematically evaluated. By frequency-dependent capacitance and conductance measurements, trap density and time constant at Al2 O3/AlgaN and AlgaN/gaN interface are *** experimental results reveal that the density of trap states and the activation energy at the Al2 O3/AlgaN interface are much higher than at the AlgaN/gaN interface. The photo-assisted capacitance-voltage measurements are performed to characterize the deep-level traps located near mid-gap at the Al2 O3/AlgaN interface, which indicates that a density of deep-level traps is lower than the density of the shallow-level states.

关键词： AlgaN/gaN HEMTs interface traps frequency-dependent C–V measurements photo-assisted C–V measurements

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Theoretical study on the mechanism of sulfur migration to gas in the pyrolysis of benzothiophene

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Frontiers of Chemical Science and Engineering 2023年第3期17卷 334-346页

作者： Ji Liu Shuang-wei Yang wei Zhao Yu-Long Wu Bin Hu Si-Han Hu Shan-wei Ma Qiang Lu National Engineering Research Center of New Energy Power generation North China Electric Power UniversityBeijing 102206China Suzhou Institute of North China Electric Power University Suzhou 215000China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China School of Chemistry and Chemical Engineering Xinjiang UniversityUrumqi City 830046China

The release and control of sulfur species in the pyrolysis of fossil fuels and solid wastes have attracted attention ***,thiophene derivatives are important intermediates for the sulfur gas release from organic sulfur,but the underlying migration mechanisms remain ***,the mechanism of sulfur migration during the release of sulfur-containing radicals in benzothiophene pyrolysis was explored through quantum chemistry *** C_(1)-to-C_(2)H-transfer has the lowest energy barrier of 269.9 kJ·mol-1 and the highest rate constant at low temperatures,while the elevated temperature is beneficial for C−S bond homolysis.2-Ethynylbenzenethiol is the key intermediate for the formation of S and SH radicals with the overall energy barriers of 408.0 and 498.7 kJ·mol-1 in favorable *** generation of CS radicals is relatively difficult because of the high energy barrier(551.8 kJ·mol-1).However,it can be significantly promoted by high temperatures,where the rate constant exceeds that for S radical generation above 930°***,the strong competitiveness of S and SH radicals results in abundant H2 S during benzothiophene pyrolysis,and the high temperature is more beneficial for CS2 generation from CS *** study lays a foundation for elucidating sulfur migration mechanisms and furthering the development of pyrolysis techniques.

关键词： benzothiophene sulfur migration pyrolysis density functional theory

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Deuterium distribution and behavior of blisters in pre-damaged and undamaged tungsten

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Tungsten 2024年第3期6卷 647-656页

作者： Cong Li Xiao-wa wa.g Ran-Ran Su Xuan-Xin Hu Shu-guang wei Han-Jun Tu Li-Qun Shi Hong-Liang Zhang Key Laboratory of Nuclear Physics and Ion-Beam Application Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Materials Science and Engineering University of WisconsinMadison WI 53706USA

Tungsten(W),as a plasma-facing material,is subjected to high fluence plasma,resulting in both radiation damage and deuterium(D)*** study explores the blistering behavior and D supersaturated layers in both pre-damaged and undamaged W *** achieve a uniform damage profile similar to neutron irradiation,carbon(C)ions with multiple energies and angles were *** samples were further irradiated with low-energy D ions under two fluences at temperatures from~380 to 640 *** various experimental techniques,we found that pre-damaged W samples can effectively suppress the formation of blistering and lower the threshold temperature at which the surface remains free of *** also observed the prominent D supersaturated peaks within the depth of 20 nm in both pre-damaged and undamaged ***,a close correlation between blistering and the D supersaturation was *** results suggest that neutron irradiation in the fusion reactors could increase the critical D concentration for blistering,while a greater depth of damage facilitated the inward diffusion of D,thereby reducing the D concentration gradient and alleviating surface blistering.

关键词： Tungsten Deuterium Supersaturated layer Blister Ion irradiation Pre-damage

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Transcutaneous acupoint electrical stimulation(TAES)for pre-operative anxiety:a prospective observational pilot investigation

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TMR Non-Drug Therapy 2020年第3期3卷 131-136页

作者： wa Cai wei-Ting Huang wei-Dong Shen Department of Acupuncture Shanghai Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai 201203China Institute of Acupuncture&Anesthesia Shanghai Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai 201203China

Objective:Transcutaneous acupoint electrical stimulation(TAES)treatment is effective for post-operative *** investigation was designed to study the feasibility and effectiveness of TAES treatment for pre-operative ***:62 volunteered surgical patients were included in the pilot *** all received TAES treatment for 30 minutes in the evening of the day before ***(LI4)and Neiguan(PC6)of both sides were selected as the treatment *** anxiety degrees were measured by State-Trait Anxiety *** rate and blood pressure were also ***:After TAES,pre-operative anxiety measured by State-Trait Anxiety Inventory dropped by almost 12%,and both heart rate and systolic blood pressure decreased ***:The pilot investigation of TAES for pre-operative anxiety can successfully test the feasibility of outcome measurements and provide necessary data for calculating the sample size of a subsequent randomized controlled trial.

关键词： Transcutaneous acupoint electrical stimulation State-Trait Anxiety Inventory Pre-operative anxiety Pilot investigation

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灰色模型在西藏需水量预测分析中的应用

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中国给水排水 2010年第1期26卷 51-53页

作者：达娃西藏农牧学院工程技术学院西藏林芝860000

根据西藏地区1998年—2002年的用水情况,采用灰色模型对其2010年和2020年的需水量进行了预测,并分析了其不同时期的需水情况。结果表明,随着经济的发展,全区的用水量仍会较快增长,但增长速度渐缓,并逐步趋于稳定;用水部门的需水结构也... 详细信息

根据西藏地区1998年—2002年的用水情况,采用灰色模型对其2010年和2020年的需水量进行了预测,并分析了其不同时期的需水情况。结果表明,随着经济的发展,全区的用水量仍会较快增长,但增长速度渐缓,并逐步趋于稳定;用水部门的需水结构也将发生变化,农村生活用水比例增加、农业用水比例降低。这一研究成果有助于西藏地区采取合理的用水规划措施,减少成本开支。

关键词：西藏需水量预测灰色模型

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