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The physical origin of observed repulsive forces between general dislocations and twin boundaries in FCC metals:An atom-continuum coupling study

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Journal of Materials Science & Technology 2022年第14期109卷 221-227页

作者： jiayong zhang Hongwu zhang Qian Li Lizi Cheng Hongfei Ye Yonggang Zheng Jian Lu Department of Engineering Mechanics State Key Laboratory of Structural Analysis for Industrial EquipmentFaculty of Vehicle Engineering and MechanicsDalian University of TechnologyDalian 116024China Department of Mechanical Engineering Shenyang National Laboratory for Materials ScienceGreater Bay Joint DivisionCity University of Hong KongTat Chee AvenueKowloonHong KongChina CityU-Shenzhen Futian Research Institute Shenzhen 518045China

The combination of ultrahigh strength and excellent ductility of nanotwinned materials is rooted in the interaction between dislocations and twin boundaries(TBs).Quantifying the interaction between TBs and dislocations not only offers fresh perspectives of designing materials with high strength and ductility,but also becomes the cornerstone of multiscale modeling of materials with *** this work,an atomcontinuum coupling model was adopted to quantitatively investigate the interaction between dislocations and *** simulation shows that the dislocation-TB interaction is much weaker than the interaction between dislocations at the same *** of the early stage of dislocation pileups further verifies that the experimentally observed repulsive forces are essentially from the dislocations or kink-like steps on *** interaction between TBs and dislocations with different Burgers vectors was demonstrated referring to the elastic theory of *** the intrinsic interaction between dislocations and TBs being clarified,this work will promote further development of the multiscale simulation methods,such as discrete dislocation dynamics or phase-field method,of materials with TBs by providing a quantitative description of the interactions between TBs and dislocations.

关键词： Twin boundary Intrinsic interaction Repulsive force Dislocation pileup Atomistic simulation Anisotropic elasticity

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Internal carotid artery agenesis with stenosed intercavernous anastomosis:a case report

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The Journal of Biomedical Research 2016年第4期30卷 344-347页

作者： Hongzhou Duan Liang Li Guiping Zhao Yang zhang jiayong zhang Department of Neurosurgery Peking University First HospitalBeijing 100034China. Neurology Peking University First HospitalBeijing 100034China.

We report a rare case of internal carotid artery agenesis with stenosed intercavernous anastomosis. A 59-year- old male patient presented with a new infarction in the left basal ganglia. Magnetic resonance angiography and cerebral angiography showed that the right internal carotid artery disappeared from the origin to the foramen lacerum segment, and there was an anastomotic artery with severe stenosis passed through the floor of the sella and in front of the cavernous sinus. The right A1 segment of the anterior cerebral artery was absent and A2 segment was supplied by the normal contralateral internal carotid artery via the anterior communicating artery.

关键词： internal carotid artery artery agenesis cavernous sinus

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Drilling Force and Temperature of Bone under Dry and Physiological Drilling Conditions

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Chinese Journal of Mechanical Engineering 2014年第6期27卷 1240-1248页

作者： XU Linlin WANG Chengyong JIANG Min HE Huiyu SONG Yuexian CHEN Hanyuan SHEN Jingnan zhang jiayong School of Electromechanical Engineering Guangdong University of Technology Guangzhou Aquila Precise Tools LTD The First Affiliated Hospital Sun Yat-sen University National Engineering Research Center for Healthcare Devices

Many researches on drilling force and temperature have been done with the aim to reduce the labour intensiveness of surgery, avoid unnecessary damage and improve drilling quality. However, there has not been a systematic study of mid- and high-speed drilling under dry and physiological conditions（injection of saline）. Furthermore, there is no consensus on optimal drilling parameters. To study these parameters under dry and physiological drilling conditions, pig humerus bones are drilled with medical twist drills operated using a wide range of drilling speeds and feed rates. Drilling force and temperature are measured using a YDZ-II01W dynamometer and a NEC TVS-500EX thermal infrared imager, respectively, to evaluate internal bone damage. To evaluate drilling quality, bone debris and hole morphology are observed by SEM（scanning electron microscopy）. Changes in drilling force and temperature give similar results during drilling such that the value of each parameter peaks just before the drill penetrates through the osteon of the compact bone into the trabeculae of the spongy bone. Drilling temperatures under physiological conditions are much lower than those observed under dry conditions, while a larger drilling force occurs under physiological conditions than dry conditions. Drilling speed and feed rate have a significant influence on drilling force, temperature, bone debris and hole morphology. The investigation of the effect of drilling force and temperature on internal bone damage reveals that a drilling speed of 4500 r/min and a feed rate of 50 mm/min are recommended for bone drilling under physiological conditions. Drilling quality peaks under these optimal parameter conditions. This paper proposes the optimal drilling parameters under mid- and high-speed surgical drilling, considering internal bone damage and drilling quality, which can be looked as a reference for surgeons performing orthopedic operations.

关键词： drilling bone medical twist drill drilling force drilling temperature internal bone damage

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Water‑Dispersible CsPbBr_(3) Perovskite Nanocrystals with Ultra‑Stability and its Application in Electrochemical CO_(2) Reduction

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Nano-Micro Letters 2021年第11期13卷 190-202页

作者： Keqiang Chen Kun Qi Tong Zhou Tingqiang Yang Yupeng zhang Zhinan Guo Chang‑Keun Lim jiayong zhang Igor Zutic Han zhang Paras N.Prasad Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060People’s Republic of China Institute for Lasers Photonicsand BiophotonicsDepartment of ChemistryUniversity at BuffaloState University of New YorkBuffaloNY 14260USA Department of Physics University at BuffaloState University of New YorkBuffaloNY 14260USA Department of Chemical and Materials Engineering School of EngineeringNazarbayev UniversityNur‑Sultan City 010000Kazakhstan Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhouJiangsu 215009People’s Republic of China

Thanks to the excellent optoelectronic properties,lead halide perovskites(LHPs)have been widely employed in highperformance optoelectronic devices such as solar cells and lightemitting ***,overcoming their poor stability against water has been one of the biggest challenges for most ***,we report a novel hot-injection method in a Pb-poor environment combined with a well-designed purification process to synthesize water-dispersible CsPbBr_(3) nanocrystals(NCs).The as-prepared NCs sustain their superior photoluminescence(91%quantum yield in water)for more than 200 days in an aqueous environment,which is attributed to a passivation effect induced by excess CsBr *** to the ultra-stability of these LHP NCs,for the first time,we report a new application of LHP NCs,in which they are applied to electrocatalysis of CO_(2) reduction ***,they show significant electrocatalytic activity(faradaic yield:32%for CH4,40%for CO)and operation stability(>350 h).

关键词： CsPbBr_(3)nanocrystals Water-dispersible Ultra-stability Electrochemical CO_(2)reduction

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Neurogranin as an important regulator in swimming training to improve the spatial memory dysfunction of mice with chronic cerebral hypoperfusion

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Journal of Sport and Health Science 2023年第1期12卷 116-129页

作者： Huawei Lin jiayong zhang Yaling Dai Huanhuan Liu Xiaojun He Lewen Chen Jing Tao Chaohui Li Weilin Liu College of Rehabilitation Medicine Fujian University of Traditional Chinese MedicineFuzhou 350122China Rehabilitation Industry Institute Fujian University of Traditional Chinese MedicineFuzhou 350122China General surgery Anxi General Hospital of Traditional Chinese MedicineQuanzhou 362400China

Background:Vascular cognitive impairment caused by chronic cerebral hypoperfusion(CCH)has become a hot issue *** exercise positively contributes to the preservation or restoration of cognitive abilities;however,the specific mechanism has remained *** recent studies found that neurogranin(Ng)is a potential biomarker for cognitive *** study aims to investigate the underlying role of Ng in swimming training to improve cognitive ***:To test this hypothesis,the clustered regularly interspaced short palindromic repeats(CRISPR)-associated protein 9(Cas9)system was utilized to construct a strain of Ng conditional knockout(Ng cKO)mice,and bilateral common carotid artery stenosis(BCAS)surgery was performed to prepare the *** Experiment 1,2-month-old male and female transgenic mice were divided into a control group(wild-type littermate,n=9)and a Ng cKO group(n=9).Then,2-month-old male and female C57BL/6 mice were divided into a sham group(C57BL/6,n=12)and a BCAS group(n=12).In Experiment 2,2-month-old male and female mice were divided into a sham group(wild-type littermate,n=12),BCAS group(n=12),swim group(n=12),BCAS+Ng cKO group(n=12),and swim+Ng cKO group(n=12).Then,7 days after BCAS,mice were given swimming training for 5 weeks(1 week for adaptation and 4 weeks for training,5 days a week,60 min a day).After intervention,laser speckle was used to detect cerebral blood perfusion in the mice,and the T maze and Morris water maze were adopted to test their spatial ***,electrophysiology and Western blotting were conducted to record long-term potential and observe the expressions of Ca^(2+)pathway-related proteins,*** was applied to analyze the expression of relevant markers in neuronal damage,inflammation,and white matter ***:The figures showed that spatial memory impairment was detected in Ng cKO mice,and a sharp decline of cerebral blood flow and an impairment of p

关键词： Neurogranin Swimming training Synaptic plasticity Vascular cognitive impairment

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Clinical Experience of"'Harmonizing MethodM based on Usage of Minor Bupleurum Decoction

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Journal of Clinical and Nursing Research 2021年第5期5卷 47-50页

作者： Shuanglong Ji jiayong zhang Shaanxi University of Chinese Medicine Xianyang 712046Shaanxi ProvinceChina

Minor Bupleurum Decoction is a common TCM compound and a classic prescription that can best reflect the"harmonizing method',of *** there are many differences on the usage and dosage of Minor Bupleurum *** with the clinical treatment experience,this paper summarizes the experience of Minor Bupleurum Decoction in the clinical treatment of *** is hoped that relevant suggestions can be provided for clinicians to improve the clinical therapeutic effect of Minor Bupleurum Decoction.

关键词： Minor Bupleurum Decoction Harmonizing method Lesser Yang disease

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Tracer system on halogen mineralizer from the epithermal deposits in Guizhou Province

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Chinese Science Bulletin 1999年第S2期44卷 159-161页

作者： PAN jiayong, zhang Qian and SHAO Shuxun Open Laboratory of Ore Deposit Geochemistry, Geochemistry of Institute, Chinese Academy of Sciences, Guiyang 550002, China Open Laboratory of Ore Deposit Geochemistry Geochemistry of Institute Chinese Academy of Sciences Guiyang 550002 China

HALOGENS are typical mineralizer elements and play a very important role in remobilization and resettlement of the ore-forming mental elements in the hydrothermal deposits. Studies of tracer system on halogens mineralizer include the following aspects: (i) halogens’ role as mineralizer in ore-forming action;(ii) halogens importance as tracer elements in formation and evolution of the epithermal ore deposit;(iii) halogens’ significance as guidance in looking for the buried orebodies. Guizhou is a concentrated area of epithermal Hg, Sb and Au deposits, where are distributed famousepithermal deposits such as the Wanshan Hg deposit, the Banpo Sb deposit, the Danzhai Hg-Au depositand the Lannigou Au deposit. Many researches into geological and geochemical characteristics of thesedeposits have been done, but few study on halogen mineralizer.

关键词： tracer system halogens mineralizer epithermal deposits Guizhou.

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体系视角下所有权担保的规范效果

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法学 2020年第8期 3-18页

作者：张家勇中南财经政法大学法学院

所有权担保可谓审视动产担保交易功能一体化效应的范例。所有权担保可分为保留所有权与纯粹担保性所有权两种基本类型,包括三种具体交易形式,呈现出所有权由归属功能向担保功能转换的不同强度。让与担保情形的所有权已完全担保功能化,... 详细信息

所有权担保可谓审视动产担保交易功能一体化效应的范例。所有权担保可分为保留所有权与纯粹担保性所有权两种基本类型,包括三种具体交易形式,呈现出所有权由归属功能向担保功能转换的不同强度。让与担保情形的所有权已完全担保功能化,所有权丧失了归属确认功能,仅具有变价功能。出卖人保留所有权、融资租赁出租人所有权(合称保留所有权)因内嵌于所担保债权的交易结构,具有不完全担保功能化的特点,在法律效果上与典型担保尤其是动产抵押有别。保留所有权一方面关注所有权的担保功能,需要与典型担保尤其是动产抵押实现担保效果一体化;另一方面,保留所有权仍然保有所有权的归属确认功能,能够通过合同机制实现向完全所有权的回归。

关键词：所有权担保所有权保留担保性所有权功能化形式化民法典

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论融资租赁的担保交易化及其限度

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社会科学辑刊 2022年第2期 76-85,F0003页

作者：张家勇中南财经政法大学法学院

融资租赁经济实质与法律形式之间的交互关系引发法律规制的难题,最典型地体现在融资租赁担保交易化的方式与限度方面。在典型交易结构下,融资租赁的融物功能附属于融资功能,具有担保交易的明显特征;但具体融资租赁交易因偏离典型结构而... 详细信息

融资租赁经济实质与法律形式之间的交互关系引发法律规制的难题,最典型地体现在融资租赁担保交易化的方式与限度方面。在典型交易结构下,融资租赁的融物功能附属于融资功能,具有担保交易的明显特征;但具体融资租赁交易因偏离典型结构而应归类为普通租赁。尽管担保性融资租赁与所有权保留买卖具有类似的担保交易特征,但不具有后者的取回权机制;在与动产抵押进行规范统合时,购置款优先权规则不适用于售后回租型融资租赁。在融资租赁合同失败的情形下,在因出租人原因致合同无效,或者承租人因出租人违约而解除合同时,租赁物归出租人所有,融资租赁担保功能应予否定;在因承租人原因致合同无效,或者出租人因承租人违约而解除合同时,融资租赁的担保功能仍应维持。

关键词：融资租赁功能主义担保交易

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论越权担保无效时公司赔偿责任的规范基础

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法学 2024年第3期 91-106页

作者：张家勇中南财经政法大学法学院

将2023年修订后的《公司法》第15条理解为权限规定,虽然能够缓和该规定在对外效力上对担保交易的负面强制效果,但也仅限于引入表见代表与表见代理的积极效果,在涉及担保无效责任时则将导致明显的问题。为此,在涉及越权担保无效的责任承... 详细信息

将2023年修订后的《公司法》第15条理解为权限规定,虽然能够缓和该规定在对外效力上对担保交易的负面强制效果,但也仅限于引入表见代表与表见代理的积极效果,在涉及担保无效责任时则将导致明显的问题。为此,在涉及越权担保无效的责任承担时,须回归该规定系限制公司对外担保交易而非具体行为人的代表权或代理权的规范意旨。鉴于法定代表人与董事、高级管理人员在对外代表(代理)公司方面的法律地位相似,以及法人侵权责任与用人者责任在过错标准适用上的差异性,在维持法人(用人者)单独责任的统一前提下,不论是法定代表人还是董事、高级管理人员违规提供对外担保,均应遵循《民法典》第62条所确立的责任配置原则,《民法典》第171条第3、4款关于无权代理人责任的规定并无适用余地。在担保合同仅加盖公司印章而无法或难以确定签约人时,公司亦应依《民法典》第62条第1款承担赔偿责任。公司在承担赔偿责任后可依《民法典》第62条第2款向违规担保者追偿。

关键词：公司对外担保表见代表无权代理损害赔偿法人单独责任

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