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Research on the influences of confining pressure and strain rate on NEPE propellant:Experimental assessment and constitutive model

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Defence Technology（防务技术） 2021年第5期17卷 1764-1774页

作者： Hui Li jin-sheng xu Jia-ming Liu Ting-yu Wang Xiong Chen Hong-wen Li School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China Technology Center Jinxi Industries Group CorporationTaiyuan030027China

In order to study the influences of confining pressure and strain rate on the mechanical properties of the Nitrate Ester Plasticized Polyether(NEPE)propellant,uniaxial tensile tests were conducted using the selfmade confining pressure system and material testing *** stress-strain responses of the NEPE propellant under different confining pressure conditions and strain rates were obtained and *** results show that confining pressure and strain rate have a remarkably influence on the mechanical responses of the NEPE *** confining pressure increases(from 0 to 5.4 MPa),the maximum tensile stress and ultimate strain increase *** the coupled effects of confining pressure and strain rate,the value of the maximum tensile stress and ultimate strain at 5.4 MPa and 0.0667 s^(-1)is 2.03 times and 2.19 times of their values under 0 MPa and 0.00333 s^(-1),***,the influence mechanism of confining pressure on the NEPE propellant was ***,based on the viscoelastic theory and continuous damage theory,a nonlinear constitutive model considering confining pressure and strain rate was *** damage was considered to be rate-dependent and *** constitutive model was validated by comparing experimental data with predictions of the constitutive *** whole maximum stress errors of the model predictions are lower than 4%and the corresponding strain errors are lower than 7%.The results show that confining pressure can suppress the damage initiation and evolution of the NEPE propellant and the nonlinear constitutive model can describe the mechanical responses of the NEPE propellant under various confining pressure conditions and strain *** research can lay a theoretical foundation for analyzing the structural integrity of propellant grain accurately under working pressure loading.

关键词： Confining pressure Strain rate NEPE propellant Constitutive model Damage

Prevalence of Chronic Kidney Disease-Mineral Bone Disorder in Hemodialysis Patients in Hebei,China

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Chinese Medical Journal 2018年第22期131卷 2749-2751页

作者： jing-jing jin sheng-Lei Zhang jin-sheng xu Li-Wen Cui Hui-Ran Zhang Ya-Ling Bai Department of Nephrology The Fourth Hospital of Hebei Medical UniversityShijiazhuangHebei 050011China

To the Editor:Chronic kidney disease-mineral bone disorder (CKD-MBD)has been found universally in hemodialysis (HD) *** increases the risk of cardiovascular morbidity and mortality,particularly vascular calcification.[1]Consequently, it is crucial to effectively control the biochemical indicators' abnormalities of ***,al guidelines have provided measures for CKD-MBD,but relevant research from developing countries is limited,especially in China.[2]

关键词： Prevalence Hemodialysis Patients

高跨导氢终端多晶金刚石长沟道场效应晶体管特性研究

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物理学报 2018年第6期67卷 244-249页

作者：张金风杨鹏志任泽阳张进成许晟瑞张春福徐雷郝跃宽带隙半导体技术国防重点学科实验室西安电子科技大学微电子学院西安710071

基于多晶金刚石制作了栅长为4 pm的铝栅氢终端金刚石场效应晶体管.器件的饱和漏源电流为160 mA/mm,导通电阻低达37.85Ω·mm,最大跨导达到32 mS/mm,且跨导高于最大值的90%的栅压(V_(GS))范围达到3 V(-2 V≤V_(GS)≤-5 V).通过传输线电... 详细信息

基于多晶金刚石制作了栅长为4 pm的铝栅氢终端金刚石场效应晶体管.器件的饱和漏源电流为160 mA/mm,导通电阻低达37.85Ω·mm,最大跨导达到32 mS/mm,且跨导高于最大值的90%的栅压(V_(GS))范围达到3 V(-2 V≤V_(GS)≤-5 V).通过传输线电阻分析以及器件的导通电阻和电容-电压特性分析,发现氢终端多晶金刚石栅下沟道中的空穴面浓度达到了1.56×10^(13)cm^(-2),有效迁移率在前述高跨导栅压范围保持在约170 cm^2/(V·s).分析认为,较低的栅源和栅漏串联电阻、沟道中高密度的载流子和在大范围栅压内的高水平迁移率是引起高而宽阔的跨导峰和低导通电阻的原因.

关键词：金刚石氢终端场效应晶体管

Investigation on optical sinc-shaped Nyquist pulse generation based on external modulation

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Optoelectronics Letters 2025年

作者： YUAN jin xu Xiuxiu State Key Laboratory of Media Convergence and Communication， Communication University of China

In this paper， a scheme for generating sinc-shaped optical Nyquist pulses based on external modulation is proposed. First， five flat optical frequency comb (OFC) lines are generated by a dual-parallel Mach-Zehnder modulator (DP-MZM) for optical carrier phase cancellation interference. Then， the phase-locked OFC is split into two paths， one of which is transmitted to a single-drive Mach-Zehnder modulator (SD-MZM) for the modulation of the even-order side-band suppression， and the other is used to remodulate the signal in order to obtain equally spaced comb lines. Eventually， equal frequency spaced phase-locked 15-line OFCs are generated and extremely narrow over-zero width Nyquist pulses are realized at 2.5GHz， 5GHz， 10GHz and 20GHz. The root-mean-square error (RMSE) is calculated for the generated Nyquist pulses which enables the verification of the signal quality.

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神经外科住院患者送检标本感染病原菌检测结果分析

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中华医院感染学杂志 2017年第7期27卷 1546-1549页

作者：常枫常金生王序申学明闫微安阳市人民医院神经外科河南安阳455000

目的探讨神经外科病房住院患者送检标本感染病原菌分布及耐药性,为临床诊治提供参考依据。方法收集医院2010-2013年神经外科病房住院患者送检的283份标本检测结果,分析感染病原菌分布及耐药率。结果 283份送检标本,病原菌培养阳性份数17... 详细信息

目的探讨神经外科病房住院患者送检标本感染病原菌分布及耐药性,为临床诊治提供参考依据。方法收集医院2010-2013年神经外科病房住院患者送检的283份标本检测结果,分析感染病原菌分布及耐药率。结果 283份送检标本,病原菌培养阳性份数171份,阳性率为60.42%;共分离出196株病原菌,以革兰阴性菌为主,占84.69%;革兰阴性菌对头孢他啶、头孢噻肟、头孢曲松、环丙沙星、左氧氟沙星、庆大霉素耐药率较高,均≥50.00%。结论神经外科病房住院患者送检标本培养的病原菌中仍然以革兰阴性菌多见,对临床常用抗菌药物耐药率普遍较高。

关键词：神经外科标本病原菌感染耐药

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X波段10GW高功率返波管振荡器设计

物理学报 2011年第10期60卷 461-464页

作者：马乔生金晓绪明李正红吴洋中国工程物理研究院应用电子学研究所绵阳621900 中国工程物理研究院环保工程研究中心绵阳621900

设计了一个高效率的高功率返波管振荡器,通过添加内导体并采用过模慢波结构,实现器件的高效率、高功率运行.当电子能量和束流分别为1.3MeV和17kA时,采用2.5维ParticleinCell(PIC)程序模拟得到频率为8.8GHz,功率为10.4GW的微波输出.

关键词：内导体相对论返波管过模慢波结构

高速铁路DS6-K5B型联锁车务仿真系统开发与应用

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西部交通科技 2017年第8期 91-93页

作者：靳丽丽陈锦生徐友良湖南高速铁路职业技术学院湖南衡阳421001

文章介绍了研究开发DS6-K5B型联锁车务仿真培训系统的意义及设计原理,着重描述了该系统解决的关键技术问题,并结合具体实践,论证了该系统在铁路运输领域学生专业技能学习及职工技能培养过程中的实用性。

关键词：高速铁路联锁仿真设计开发应用

Boosting aqueous nickel-zinc battery stability with bimetallic ion-integrated 1D metal-organic nanowires

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Science China Chemistry 2025年

作者： Yihao Chen jin Liang Yichun Su Guoyin Zhu Hengyue xu Hongye Ding Guangxun Zhang Dianheng Yu Zizhou Shen Yizhou Zhang Wei Huang Huan Pang School of Chemistry and Chemical Engineering Yangzhou University Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM) School of Flexible Electronics (Future Technologies) Nanjing Tech University (NanjingTech) Institute of Advanced Materials and Flexible Electronics (IAMFE) School of Chemistry and Materials Science Nanjing University of Information Science & Technology Department of Chemistry Tsinghua University State Key Laboratory of Coordination Chemistry Nanjing University

Limited by low conductivity,designing cathode materials with excellent electron transfer efficiency for high-performance nickel-zinc batteries （NZBs） remains *** this study,a series of bimetallic metal-organic nanowires were fabricated by doping M ions in NiNTA,resulting in NiMNTA (M=Mg2+,Mn2+,Co2+,Zn2+,Ag+),and NixCo6-xNTA （x=1,2,3,4,5）.The proportions and types of metal ions can be modified without altering the initial coordination structure.X-ray absorption fine structure spectroscopy （XAFS） revealed that only M–O bonds,not metal bonds,were present in the *** performance of Ni2Co4NTA as the cathode for aqueous NZBs was significantly improved,achieving the maximum energy density of 279.17Wh kg-1with the high cycle stability （retention rate of 72.0%after 1,000 cycles）.The flexible Ni2Co4NTA//Zn@carbon cloth battery employing gel electrolyte also exhibits the excellent Coulombic efficiency of 96%after 350 *** approach shows considerable potential for designing one-dimensional materials with bimetallic modifications,providing new strategies for developing cathode materials for NZBs with high specific capacity and cycle stability.

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Peri-centrosomal localization of small interfering RNAs in C. elegans

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Science China Life Sciences 2025年

作者： Qile jin xuezhu Feng Minjie Hong Ke Wang Xiangyang Chen Jiewei Cheng Yan Kuang Xiaoyue Si Mingjing xu Xinya Huang Shouhong Guang Chengming Zhu Department of Obstetrics and Gynecology The First Affiliated Hospital of USTC The USTC RNA Institute Hefei National Research Center for Physical Sciences at the Microscale School of Life Sciences Division of Life Sciences and Medicine Biomedical Sciences and Health Laboratory of Anhui Province University of Science and Technology of China School of Basic Medicine Anhui Medical University

The centrosome is the microtubule-organizing center and a crucial part of cell division. Centrosomal RNAs(cnRNAs) have been reported to enable precise spatiotemporal control of gene expression during cell division in many species. Whether and how cnRNAs exist in C. elegans are unclear. Here, using the nuclear RNAi Argonaute protein NRDE-3 as a reporter, we observed potential peri-centrosome localized small interfering(si)RNAs in C. elegans. NRDE-3 was previously shown to associate with pre-mRNAs and pre-rRNAs via a process involving the presence of complementary siRNAs. We generated a GFP-NRDE-3 knock-in transgene through CRISPR/Cas9 technology and observed that NRDE-3 formed peri-centrosomal foci neighboring the tubulin protein TBB-2, other centriole proteins and pericentriolar material(PCM)components in C. elegans embryos. The peri-centrosomal accumulation of NRDE-3 depends on RNA-dependent RNA polymerase(RdRP)-synthesized 22G siRNAs and the PAZ domain of NRDE-3, which is essential for siRNA binding. Mutation of eri-1, ergo-1, or drh-3 significantly increased the percentage of pericentrosome-enriched NRDE-3. At the metaphase of the cell cycle, NRDE-3 was enriched in both the peri-centrosomal region and the spindle. Moreover, the integrity of centriole proteins and pericentriolar material(PCM) components is also required for the peri-centrosomal accumulation of NRDE-3. Therefore, we concluded that siRNAs could accumulate in the pericentrosomal region in C. elegans and suggested that the peri-centrosomal region may also be a platform for RNAi-mediated gene regulation.

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