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Multi-Period Resilient Model for VSC-Based AC-DC HDS Considering Public-Safety Power Shutoff to Mitigate Wildfires

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 821-833页

作者： Zekai Wang Tao Ding xiaosheng zhang Chenggang Mu Pengwei Du Fangxing Li School of Electrical Engineering Xi'an Jiaotong UniversityXi'an 710049China Electric Reliability Council of Texas AustinTX76574 USA Department of Electrical Engineering and Computer Science The University of TennesseeKnoxville(UTK)TN37996USA

This paper proposes a voltage source converter (VSC) -based AC-DC hybrid distribution system (HDS) resilient model to mitigate power outages caused by wildfires. Before a wildfire happens, the public-safety power shutoff (PSPS) strategy is applied to actively cut some vulnerable lines which may easily cause wildfires, and reinforce some lines that are connected to critical loads. To mitigate load shedding caused by active line disconnection in the PSPS strategy, network reconfiguration is applied before the wildfire occurrence. During the restoration period, repair crews (RCs) repair faulted lines, and network reconfiguration is also taken into consideration in the recovery strategy to pick up critical loads. Since there exists possible errors in the wildfire prediction, several different scenarios of wildfire occurrence have been taken into consideration, leading to the proposition of a stochastic multi-period resilient model for the VSC-based AC-DC HDS. To accelerate the computational performance, a progressive hedging algorithm has been applied to solve the stochastic model which can be written as a mixed-integer linear program. The proposed model is verified on a 106-bus AC-DC HDS under wildfire conditions, and the result shows the proposed model not only can improve the system resilience but also accelerate computational speed.

关键词： AC-DC hybrid distribution system restoration network reconfiguration progressive hedging public safety power shutoffs strategy resilience

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绞线机摇架顶针组件结构优化改进

金属制品 2024年第1期50卷 51-53页

作者：张小生江西新华新材料科技股份有限公司江西新余338004

绞线机摇架顶针组件存在结构问题,使轴承、顶针等零件易损坏。综合分析顶针组件各零件的作用、结构组成及其维修情况,对摇架顶针组件进行优化设计及改进。通过改变圆锥滚子轴承单个安装为成对背靠背安装方式,调整轴承挡圈与紧固方式等结... 详细信息

绞线机摇架顶针组件存在结构问题,使轴承、顶针等零件易损坏。综合分析顶针组件各零件的作用、结构组成及其维修情况,对摇架顶针组件进行优化设计及改进。通过改变圆锥滚子轴承单个安装为成对背靠背安装方式,调整轴承挡圈与紧固方式等结构,增大轴承承载强度;增设中心光孔及顶丝孔,改盲孔型为通孔型等,大大提高顶针组件维修效率。优化改进后,摇架顶针组件故障减少,维修难度也大大降低。

关键词：钢绞线摇架活塞体顶针轴承

利用CRISPR/Cas9技术构建RAG1基因敲除免疫缺陷猪模型的研究

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黑龙江畜牧兽医 2024年第9期 1-7,114,115页

作者：王清未李振阳张效生张林林天津农学院动物科学与动物医学学院天津市农业动物繁育与健康养殖重点实验室天津300384 天津市农业科学院畜牧兽医研究所天津300381 天津市畜禽分子育种与生物技术重点实验室天津300384 天津市畜禽健康养殖工程技术中心天津300384

为了利用显微注射一步法构建RAG1基因敲除的免疫缺陷猪模型,试验利用CRISPR/Cas9技术针对猪的RAG1基因设计并筛选出高效的sgRNA,与体外转录的Cas9 mRNA按照4∶6比例混合后显微注射到猪体外受精的受精卵中,随后将基因编辑的受精卵移植到... 详细信息

为了利用显微注射一步法构建RAG1基因敲除的免疫缺陷猪模型,试验利用CRISPR/Cas9技术针对猪的RAG1基因设计并筛选出高效的sgRNA,与体外转录的Cas9 mRNA按照4∶6比例混合后显微注射到猪体外受精的受精卵中,随后将基因编辑的受精卵移植到受体母猪输卵管内;仔猪出生后采集耳缘皮肤组织提取基因组进行PCR扩增、T7核酸内切酶Ⅰ酶切鉴定,以及利用Sanger法测序鉴定编辑后基因型;监测基因敲除的免疫缺陷仔猪在普通环境的生存周期;对死亡的仔猪进行剖检,采集胸腺和脾脏等免疫器官进行组织学分析。结果表明:通过在猪成纤维细胞系水平上进行RAG1基因敲除效率的筛选,筛选出针对猪RAG1基因第2外显子高效敲除的sgRNA序列,通过对猪受精卵胞质显微注射sgRNA和Cas9 mRNA混合物,获得2头RAG1基因敲除免疫缺陷仔猪,经鉴定发现RAG1基因的第2外显子碱基序列中有1 bp插入,造成移码突变,破坏了RAG1基因功能,致使仔猪免疫系统缺陷。出生的2头免疫缺陷仔猪在普通饲养环境的存活时间分别为19 d和33 d。RAG1基因敲除的免疫缺陷仔猪胸腺缺失,脾脏发育不良,无法在正常饲养环境中长时间存活。脾脏结构紊乱,出现炎症细胞浸润等免疫系统异常。说明通过CRISPR/Cas9技术进行显微注射可获得RAG1基因敲除的免疫缺陷猪模型。

关键词：免疫缺陷动物 CRISPR/Cas9 猪 RAG1 sgRNA

Controlled Growth of One-Dimensional Oxide Nanomaterials

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Journal of Materials Science & Technology 2006年第1期22卷 1-18页

作者： xiaosheng FANG Lide zhang Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences P.O. Box 1129Hefei 230031 China

This article reviews the recent developments in the controlled growth of one-dimensional （1D） oxide nanomaterials, including ZnO, SnO2, In203, Ga203, SiOx, MgO, and Al203. The growth of 2D oxide nanomaterials was carried out in a simple chemical vapor transport and condensation system. This article will begin with a survey of nanotechnology and 1D nanomaterials achieved by many researchers, and then mainly discuss on the controlled growth of ID oxide nanomaterials with their morphologies, sizes, compositions, and microstructures controlled by altering experimental parameters, such as the temperature at the source material and the substrate, temperature gradient in the tube furnace, the total reaction time, the heating rate of the furnace, the gas flow rate, and the starting material. Their roles in the formation of various morphologies are analyzed and discussed. Finally, this review will be concluded with personal perspectives on the future research directions of this area.

关键词： Controlled growth One-dimensional Oxide Nanomaterials

One-Dimensional (1D) ZnS Nanomaterials and Nanostructures

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Journal of Materials Science & Technology 2006年第6期22卷 721-736,I0001-I0002页

作者： xiaosheng FANG Lide zhang Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences P.O.Box 1129 Hefei 230031 China

One-dimensional （1D） nanomaterials and nanostructures have received much attention due to their potential interest for understanding fundamental physical concepts and for applications in constructing nanoscale electric and optoelectronic devices. Zinc sulfide （ZnS） is an important semiconductor compound of Ⅱ-Ⅵ group, and the synthesis of 1D ZnS nanomaterials and nanostructures has been of growing interest owing to their promising application in nanoscale optoelectronic devices. This paper reviews the recent progress on 1D ZnS nanomaterials and nanostructures, including nanowires, nanowire arrays, nanorods, nanobelts or nanoribbons, nanocables, and hierarchical nanostructures etc. This article begins with a survey of various methods that have been developed for generating 1D nanomaterials and nanostructures, and then mainly focuses on structures, synthesis, characterization, formation mechanisms and optical property tuning, and luminescence mechanisms of 1D ZnS nanomaterials and nanostructures. Finally, this review concludes with personal views towards future research on 1D ZnS nanomaterials and nanostructures.

关键词： One-dimensional ZnS Nanomaterials Nanostructures

Tribological Properties of Magnesium Ion-exchanged α-Zirconium Phosphate as a Solid Lubricant Additive in Lithium Grease

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Journal of Wuhan University of Technology(Materials Science) 2019年第1期34卷 47-54页

作者： zhang xiaosheng XU Hong Research Institute of Special Chemicals College of Chemistry and Chemical Engineering Taiyuan University of Technology

Magnesium ion-exchanged a-zirconium phosphates(Mg-α-ZrP) with particle sizes of 600 and 80 nm were prepared through the sealed ion-exchange and one-step hydrothermal synthesis methods, respectively. It was found that larger particles of Mg-α-ZrP had a higher load-carrying capacity than that of smaller particles, whereas smaller Mg-α-ZrP particles had better anti-wear properties than that of larger Mg-α-ZrP particles under mild loads. The correlation between the particle size of the sample and the surface roughness of the friction pair thus seems to be a key factor influencing the performance.

关键词： layered α-zirconium phosphate ion-exchange tribological properties magnesium particle size

Fabrication and characterization of squama-shape micro/nano multi-scale silicon material

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Science China(Technological Sciences) 2012年第12期55卷 3395-3400页

作者： zhang xiaosheng ZHU FuYun SUN GuangYi zhang HaiXia National Key Lab of Nano/Micro Fabrication Technology Peking UniversityBeijing 100871China Mechanical and Aerospace Engineering Department University of CaliforniaLos AngelesCalifornia 90095USA

This paper presents the fabrication of squama-shape micro/nano multi-scale structures and the analysis of the interaction among different-scale structures during the fabrication processes. Well-designed microstructures made of inverted pyramids and V-shape grooves are fabricated by KOH wet etching. High-dense high-aspect-ratio (HAR) nanostructures are fabricated atop microstructures by an improved maskless deep reactive ion etching (DRIE) process, with an optimized recipe to form micro/nano dual-scale structures (MNDS). Due to the impact of the profile of microstructures on the shape of nanostructures, dissymmetrical (i.e., squama-shape) nanopillars have been formed on the inclined surfaces of microstructures, while the symmetrical nanopillars are formed on the horizontal surfaces with different formation velocities. Furthermore, the optical properties of MNDS are not sensitive to structural parameters of microstructures, making the sample overcome the lithography limitation of conventional processes for photo-devices. Eventually, three-level structures are fabricated by sputtering a gold thin film on the MNDS, and the profile of MNDS is selective in the deposition of gold particles, which is very useful for practical applications.

关键词： deep reactive ion etching (DRIE) multi-scale structures squama-shape hierarchical structure silicon

Investigation and characterization of an arc-shaped piezoelectric generator

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Science China(Technological Sciences) 2013年第11期56卷 2636-2641页

作者： HAN MengDi LIU Wen zhang xiaosheng MENG Bo zhang HaiXia Institute of Microelectronics Peking University Peking University Shenzhen Graduate School

A novel arc-shaped piezoelectric generator based on flexible PVDF thin film is presented and systemically *** a periodical external force,the generator can produce peak voltage of 45.6 V and peak power of 30.7μ*** maximum power density reaches 38.4μW/cm3with a 4 cm×2 cm×100μm device,at the optimum load resistance of 33.33 *** influence of frequency,size dimension and load resistance are investigated through experimental *** this high output arc-shaped generator,capacitors can be effectively charged and three commercial LEDs have been directly lighted without any energy storage unit.

关键词： piezoelectric generator arc-shaped PVDF high output self-powered system

Self-powered forest ambient monitoring microsystem based on wind energy hybrid nanogenerators

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Science China(Technological Sciences) 2022年第10期65卷 2348-2360页

作者： LI BoYuan QIU Yu HUANG Peng TANG WenJie zhang xiaosheng School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China

In response to the call for zero-carbon energy supply for Internet of Things(IoTs)applications and to get rid of the dependence of traditional distributed IoTs devices on batteries,the invention of nanogenerators that can convert wind energy in the surrounding environment into electrical energy have received widespread ***,a wind energy hybrid harvester(WH-EH)combining a soft-friction and positive-directional triboelectric nanogenerator(SP-TENG)and a hierarchical rotating electromagnetic nanogenerator(HR-EMG)is reported to construct a self-powered forest environment monitoring *** the design of thin inner wall beams and comb-shaped electrodes,the SP-TENG is able to change the output into positivedirectional,which can be stored directly in the energy storage device,breaking the limitation of the alternating positive and negative output of conventional *** addition,the HR-EMG embeds coils in the cup lid to make the most of the available space in the external *** the WH-EH,a layered structure,including the HR-EMG and SP-TENG is adopted to jointly utilize wind energy for both higher output and higher *** order to effectively implement wireless monitoring of the forest environment,the WH-EH is further utilized to develop a self-powered forest environment monitoring microsystem by powering the IoTs sensor nodes,realizing ambient temperature and humidity sampling and wireless transmission,so as to achieve the purpose of preventing forest *** is believed that the development of the WH-EH and the self-powered forest environment monitoring microsystem provides diverse options for the practicalization of self-powered IoTs systems and the energy supply problem of IoTs sensor networks.

关键词： self-powered nanogenerator MEMS energy harvesting microsystem