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Journal of Energy Chemistry 2022年第11期31卷 317-323,I0009页

作者： Tianran Yan Jie Feng Pan Zeng Gang Zhao Lei Wang cheng Yuan chen cheng Youyong Li Liang Zhang Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123JiangsuChina Jiangsu key Laboratory for Carbon-Based Functional Materials&Devices Soochow UniversitySuzhou 215123JiangsuChina Jiangsu key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhou 215123JiangsuChina

Accelerating the sluggish redox kinetics of lithium polysulfides(LiPSs)by electrocatalysis is essential to achieve high performance lithium-sulfur(Li-S)***,the issue of insufficient catalytic activity remains to be ***,a strategy of modulating e_(g) orbitals through ligand engineering has been proposed to boost the catalytic activity of NiSe for rapid LiPSs redox *** X-ray spectroscopic measurements and theoretical calculations reveal that partial substitution of Se with N disrupts the octahedral coordination of Ni atoms in NiSe,leading to the reduced degeneracy and upward shift of e_(g) orbitals of Ni 3 d *** a consequence,the bonding strength of N-substituted NiSe(N-NiSe)with LiPSs is enhanced,which facilitates the interfacial charge transfer kinetics and accelerates the LiPSs redox ***,the Li-S batteries assembled with N-NiSe present a high capacity of 682.6 mAh g^(-1) at a high rate of 5 C and a high areal capacity of 6.5 mAh cm^(-2)at a high sulfur loading of 6 mg cm^(-2).This work provides a promising strategy to develop efficient transition-metal based electrocatalysts for Li-S batteries through e_(g) orbital modulation.

关键词： Li-S batteries eg orbitals modulation Ligand engineering Shuttle effect Redox kinetics

RE-AERATION LAW OF WATER FLOW OVER SPILLWAYS

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Journal of Hydrodynamics 2006年第2期18卷 231-236页

作者： cheng Xiang-ju LUO Lin chen Yong-can ZHAO Wen-qian Department of Hydraulic Engineering Tsinghua University Beijing 100084 China State key Laboratory of Hydraulics and Mountain River Engineering Sichuan University Chengdu 610065China Departmentof Hydraulic Engineering Tsinghua University Beijing 100084 China

In order to explore the re-aeration law of water flow over spillway, the transfer process of oxygen in water flow over spillway was studied. The interfacial mass transfer coefficients were obtained by experiments. The flow fields and the turbulence characteristics are simulated by numerical methods. The fractional Volume Of Fluid （VOF） model of the air-water two phase flows was introduced to track the interface. Consequently, the quantitative expression of the interfacial mass transfer coefficients related with velocity and kinetic energy at the free surface was derived and the re-aeration model for the water flow over spillway was established. The examination with the experimental data of different conditions shows the validity of the re-aeration model for the water flow over spillways. This study will be important to evaluate the dissolved oxygen concentration and self-purification ability of rivers.

关键词： re-aeration mass transfer coefficient spillway

Effect of Cu Addition in Pipeline Steels on Microstructure,Mechanical Properties and Microbiologically Influenced Corrosion

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Acta Metallurgica Sinica(English Letters) 2017年第7期30卷 601-613页

作者： Xian-Bo Shi Wei Yan Mao-cheng Yan Wei Wang Zhen-Guo Yang Yi-Yin Shan ke Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China

In the present study, Cu-modified pipeline steels were fabricated to mitigate MIC by the antimicrobial ability of Cu element. The microstructure, mechanical properties and the antimircobial performance of the Cu-modified steel were systematically investigated. The Cu-modified steels showed good antimicrobial performance with remarkable strength enhancement by nanoscale Cu-rich precipitates and good impact toughness without changing the original base microstructures after the optimal aging treatment of 500 °C/1 h.

关键词： Pipeline steel Cu addition Mechanical properties Microstructure Antimicrobial performance

塔里木盆地轮古地区流体包裹体特征与油气成藏过程

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地球科学 2024年第7期49卷 2407-2419页

作者：张泽杨宪彰郝芳田金强陈永权罗新生张科王新新丛富云中国石油大学地球科学与技术学院山东青岛266580 中国石油大学深层油气重点实验室山东青岛266580 中国石油塔里木油田公司新疆库尔勒814000

明确轮古地区流体包裹体特征与油气成藏过程.通过对轮古地区的岩心样品岩石学观察、流体包裹体系统分析测试和原油荧光测定,结合均一温度-埋藏史投影法,并模拟烃源岩生烃史,恢复油气成藏过程.结果表明,轮古地区奥陶系发育三期油包裹体,... 详细信息

明确轮古地区流体包裹体特征与油气成藏过程.通过对轮古地区的岩心样品岩石学观察、流体包裹体系统分析测试和原油荧光测定,结合均一温度-埋藏史投影法,并模拟烃源岩生烃史,恢复油气成藏过程.结果表明,轮古地区奥陶系发育三期油包裹体,分别发黄褐色、黄绿色和蓝色荧光,伴生的盐水包裹体均一温度范围分别是70~100℃、80~110℃、100~120℃.全区三期油包裹体对应3个充注期,分别是加里东晚期-海西早期、海西晚期和喜山期.轮古西部地区的原油的主充注期为加里东晚期-海西早期,轮古中部地区的原油的主充注期为海西晚期,轮古东部地区的原油的主充注期为喜山期.

关键词：塔里木盆地轮古地区深层油气藏流体包裹体主成藏期石油地质

Safety threshold of high-speed railway pier settlement based on train-track-bridge dynamic interaction

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Science China(Technological Sciences) 2015年第2期58卷 202-210页

作者： chen Zhao Wei ZHAI Wan Ming CAI cheng Biao SUN Yu State key Laboratory of Traction Power Southwest Jiaotong University

This paper presents a method to determine the safety threshold of bridge pier settlement in high-speed *** analytical expression of the mapping relationship between the pier settlement and the rail deformation is derived theoretically for the double block ballastless track-bridge *** adopting the superposition of the track random irregularity and the rail deformation caused by the pier settlement as the excitation inputs,the variations of vehicle dynamics indices with pier settlement are comparatively ***,the safety threshold of the bridge pier settlement is obtained according to the limit of vehicle running safety and ride comfort indices of the high-speed *** show that the dynamics indices of different trains have different sensitivities to the pier settlement,and the train CRH2C is the most sensitive one among all the types of Chinese high-speed *** passing through the bridges in common span with pier settlement at the speed of 250–350 km/h,the trains suffer the low-frequency excitations,and the vertical acceleration of car body is most sensitive to the pier settlement of all the dynamics *** the car body vertical acceleration just exceeds the allowable limit,the critical settlement value is 23.4 mm,which is much bigger than the pier differential settlement limit in the current code for Chinese high-speed railways.

关键词： high-speed railway pier settlement safety threshold dynamic characteristics train-track-bridge dynamic interaction

SecIngress:An API Gateway Framework to Secure Cloud Applications Based on N-Variant System

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China Communications 2021年第8期18卷 17-34页

作者： Dacheng Zhou Hongchang chen Guozhen cheng Weizhen He Lingshu Li National Digital Switching System Engineering and Technological R&D Center ZhengzhouHenan 450002China

Based on the diversified technology and the cross-validation mechanism,the N-variant system provides a secure service architecture for cloud providers to protect the cloud applications from attacks by executing multiple variants of a single software in parallel and then checking their behaviors’***,it is complex to upgrade current Software as a Service(SaaS)applications to adapt N-variant system *** arise from the inability of tenants to adjust the application architecture in the cloud environment,and the difficulty for cloud service providers to implement N-variant systems using existing API *** paper proposes SecIngress,an API gateway framework,to overcome the challenge that it is hard in the cloud environment to upgrade the applications based on N-variants *** design a two-stage timeout processing method to lessen the service latency and an Analytic Hierarchy Process Voting under the Metadata mechanism(AHPVM)to enhance voting *** implement a prototype in a testbed environment and analyze the security and performance metrics before and after deploying the prototype to show the effectiveness of *** results reveal that SecIngress enhances the reliability of cloud applications with acceptable performance degradation.

关键词： N-variant system API gateway cloud security analytic hierarchy process

Machining performance on hybrid process of abrasive jet machining and electrical discharge machining

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中国有色金属学会会刊：英文版 2012年第S3期22卷 775-780页

作者： Yan-cherng LIN Yuan-feng chen A-cheng WANG Wan-lin SEI Department of Mechanical Engineering Chien Hsin University of Science and Technology Department of Mechanical Engineering Nan Kai University of Technology

To develop a hybrid process of abrasive jet machining (AJM) and electrical discharge machining (EDM),the effects of the hybrid process parameters on machining performance were comprehensively investigated to confirm the benefits of this hybrid *** appropriate abrasives delivered by high speed gas media were incorporated with an EDM in gas system to construct the hybrid process of AJM and EDM,and then the high speed abrasives could impinge on the machined surface to remove the recast layer caused by EDM process to increase the efficiency of material removal and reduce the surface *** this study,the benefits of the hybrid process were determined as the machining performance of hybrid process was compared with that of the EDM in gas *** main process parameters were varied to explore their effects on material removal rate,surface roughness and surface *** experimental results show that the hybrid process of AJM and EDM can enhance the machining efficiency and improve the surface ***,the developed hybrid process can fit the requirements of modern manufacturing applications.

关键词： hybrid process electrical discharge machining abrasive jet machining EDM in gas surface roughness

Effect of liver cirrhosis on long-term outcomes after acute respiratory failure: A population-based study

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World Journal of Gastroenterology 2017年第12期23卷 2201-2208页

作者： Chih-cheng Lai Chung-Han Ho Kuo-chen cheng Chien-Ming Chao Chin-Ming chen Willy Chou Department of Intensive Care Medicine Chi Mei Medical Center Departments of Medical Research Chi Mei Medical Center Internal Medicine Chi Mei Medical Center Department of Safety Health and EnvironmentChung Hwa University of Medical Technology Department of Recreation and Health-Care Management Chia Nan University of Pharmacy and Science

AIM To assessed the effect of liver cirrhosis(LC) on the poorly understood long-term mortality risk after firstever mechanical ventilation(1-MV) for acute respiratory *** All patients in Taiwan given a 1-MV between 1997 and 2013 were identified in Taiwan's Longitudinal Health Insurance Database 2000. Each patient with LC was individually matched, using a propensity-score method, to two patients without LC. The primary outcome was death after a *** A total of 16653 patients were enrolled: 5551 LC-positive (LC^([Pos])) patients, including 1732 with cryptogenic LCs and 11102 LC-negative(LC^([Pos])) controls. LC^([Pos]) patients had more organ failures and were more likely to be admitted to medical department than were LC^([Pos]) controls. LC^([Pos]) patients had a significantly lower survival rate(AHR = 1.38, 95%CI: 1.32-1.44). Moreover, the mortality risk was significantly higher for patients with non-cryptogenic LC than for patients with cryptogenic LC(AHR = 1.43, 95%CI: 1.32-1.54) and patients without LC(AHR = 1.56, 95%CI: 1.32-1.54). However, there was no significant difference between patients with cryptogenic and without LC(HR = 1.05, 95%CI: 0.98-1.12).CONCLUSION LC, especially non-cryptogenic LC, significantly increases the risk of death after a 1-MV.

关键词： Liver cirrhosis Mechanical ventilation Outcome

双环戊二烯单体预聚增粘及其碳纤维增强复合材料性能评价

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复合材料学报 2024年第1期41卷 155-169页

作者：程超张晨宇裴志磊陈正国周飞周金利张辉孙泽玉余木火东华大学材料科学与工程学院纤维材料改性国家重点实验室上海201620 上海工程技术大学材料工程学院上海201620 上海碳纤维复合材料创新研究院有限公司上海201512 中国石化上海石油化工股份有限公司化工部上海200540 中原工学院纺织学院郑州450007

聚双环戊二烯(PDCPD)作为一种综合性能优异的热固性树脂,可与连续碳纤维进行复合,应用在工程领域上,以满足轻量化和节能环保需求。本文首先通过调节双环戊二烯单体(DCPD)与Grubbs 2代催化剂的质量比使其只聚合不交联,调节黏度以满足真... 详细信息

聚双环戊二烯(PDCPD)作为一种综合性能优异的热固性树脂,可与连续碳纤维进行复合,应用在工程领域上,以满足轻量化和节能环保需求。本文首先通过调节双环戊二烯单体(DCPD)与Grubbs 2代催化剂的质量比使其只聚合不交联,调节黏度以满足真空辅助灌注成型(VARI)工艺对树脂特性的要求。随后对碳纤维表面进行丙酮去浆处理,再与上述加入足量催化剂的预聚物进行复合。对比PDCPD复合材料与通用型环氧树脂复合材料的拉伸、弯曲、V型缺口剪切、层间Ⅰ型以及Ⅱ型断裂韧性、冲击和热力学性能,研究PDCPD复合材料在不同加载模式下的失效机制,探寻其在工程领域应用的关键点和方向。结果表明,去浆后碳纤维与PDCPD界面结合良好,PDCPD复合材料在强度上与环氧树脂相当,在抵抗变形能力上较弱,但是在遭受高于极限强度的载荷后,仍然具有一定程度的承载能力;从层间断裂韧性来看,PDCPD复合材料Ⅰ型断裂韧性和Ⅱ型断裂韧性分别相当于环氧树脂复合材料的406%和250%,具有优异的抵抗分层能力;对比两种复合材料抗冲击性能,3.2 mm的PDCPD复合材料层合板在40 J能量的冲击下,表面产生层合板勉强可见冲击损伤(BVID),背面无明显纤维破裂现象,剩余冲击压缩强度比环氧树脂复合材料高34.7%。

关键词：聚双环戊二烯力学性能复合材料液体成型树脂基复合材料层间断裂韧性

地表水中全氟及多氟烷基化合物(PFASs)的污染现状研究进展

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环境化学 2024年第3期43卷 693-710页

作者：黄柳青王雯冉张浴曈徐翊宸王新皓俞学如陈森谷成陈张浩南京大学环境学院污染控制与资源化国家重点实验室南京210023 南京市生态环境保护科学研究院南京210013

近年来,全氟及多氟烷基化合物(per-and polyfluoroalkyl substances,PFASs)的大量生产使用,使得其在自然水体中的浓度日益升高.由于PFASs的生物毒性及强稳定性,环境中的PFASs严重威胁到生态环境及人类健康.目前,多个国家及相关国际组织... 详细信息

近年来,全氟及多氟烷基化合物(per-and polyfluoroalkyl substances,PFASs)的大量生产使用,使得其在自然水体中的浓度日益升高.由于PFASs的生物毒性及强稳定性,环境中的PFASs严重威胁到生态环境及人类健康.目前,多个国家及相关国际组织开始对地表水中的PFASs展开检测,但目前的监测基本属于点源监测,大范围、长时间维度的监测依然缺乏,从而无法准确揭示PFASs的时空赋存特征.本文概述了PFASs在地表水中的赋存水平,同时阐述了地表水环境中PFASs的水平分布和垂直分布特征,并揭示了地表水中PFASs污染水平与组成的时间变化规律,总结了影响PFASs污染的主要因素,对后续PFASs监测提出了建议,以期为准确评估水环境中PFASs的污染状况提供依据.

关键词：全氟及多氟烷基化合物地表水污染特征时空差异性