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Effect of thermal exposure time on tellurium-induced embrittlement of Ni–16Mo–7Cr–4Fe alloy

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Nuclear Science and Techniques 2017年第12期28卷 231-236页

作者： Xiang-Wei Chu Hong-Wei Cheng Cai-Tao Fu Bin leng Yan-Yan Jia fang Liu Zhi-Jun Li Shanghai Institute of Applied Physics Chinese Academy of ScienceJiading CampusShanghai 201800China School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China National Center for Electron Microscopy in Beijing Tsinghua UniversityBeijing 100084China

The embrittlement of nickel-based structural alloys by fission-produced tellurium(Te) is a major challenge for molten salt reactors(MSR). In this study, the effects of thermal exposure time on tellurium diffusion in a candidate MSR structural alloy(Ni–16 Mo–7 Cr–4 Fe) and the consequent mechanical property degradation of the alloy were investigated through surrogate diffusion experiments at 700 °C. The results show that some tellurium reacted with the alloy to form tellurides on the surface,while some tellurium diffused into the alloy along grain boundaries. Ni_3Te_2 and CrTe were the most stable reaction products at the tested temperature, and the formation of CrTe on the surface induced the Cr depletion at grain boundaries of the alloy. The diffusion depth of Te increased gradually with thermal exposure time, and thediffusion rate kept stable within the test duration of up to3000 h. The Te diffusion in the alloy caused the embrittlement of grain boundaries, inducing crack formation and strength degradation in tensile test at room temperature.

关键词： Tellurium Grain boundary Embrittlement Intergranular cracking Nickel-based alloy Molten salt reactor

Effect of overtime pancreaticoduodenectomy on the short-term prognosis of patients

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World Journal of Gastrointestinal Surgery 2022年第5期14卷 419-428页

作者： Jin-Zhu Zhang Shu Li Wei-Hua Zhu Xi-Sheng leng Da-fang Zhang Department of Hepatobiliary Surgery Peking University People's HospitalBeijing 100044China

BACKGROUND Due to the large number of operations,surgeons sometimes need to work overtime or even stay up late to perform *** and sleep deprivation can result in an increased error rate at *** have been numerous studies about the effect of overtime surgery on the prognosis of ***,the effect of overtime work for pancreaticoduodenectomy on the prognosis of patients is *** study explores the impact of overtime work for pancreaticoduodenectomy on the prognosis of *** To explore the impact of overtime work for pancreaticoduodenectomy on the short-term prognosis of *** This was a single-center,retrospective cohort *** patients who underwent pancreaticoduodenectomy between January 2017 and December 2019 were *** were stratified by operative start time into the control group(surgery that started between 8:00 and 16:49)and the overtime group(surgery that started between 17:00 and 22:00)and compared intraoperative and postoperative *** following parameters were compared between the overtime group and the control group:Operative time,blood loss,number of lymph nodes removed,duration of treatment in the Intensive Care Unit(ICU),and incidence of *** From January 2017 to December 2019,a total of 239 patients underwent pancreaticoduodenectomy in the Department of Hepatobiliary Surgery of our *** patients were excluded from this study due to lack of clinical data.A total of 235 patients were included,with 177 in the control group and 58 in the overtime *** was no difference between the two groups in operative time,blood loss,number of lymph nodes removed,ICU length of stay,hospital length of stay,mortality during *** with the control group,the overtime group had a higher incidence of pancreatic fistula(32.8%vs 15.8%,P<0.05).Multivariate analysis showed that overtime work,higher Body Mass Index were independent risk

关键词： Pancreaticoduodenectomy Fatigue Surgery Pancreatic fistula General surgery Overtime surgery

Touschek lifetime study based on the precise bunch-by-bunch BCM system at SSRF

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Nuclear Science and Techniques 2019年第9期30卷 126-133页

作者： fang-Zhou Chen Zhi-Chu Chen Yi-Mei Zhou Ning Zhang Bo Gao Xing-Yi Xu Yong-Bin leng Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201200 China

Continuous tracking of bunch charges is the key to maintain stable operations in a storage ring in top-up mode. Recently, a precise bunch-by-bunch beam-current measurement (BCM) system has been developed at the Shanghai Synchrotron Radiation Facility. To avoid the influence of longitudinal oscillation on the amplitudes of the sampling points, a method called two-point equilibrium sampling is introduced. The results, obtained during routine operation time, show that the relative resolution of the measurement of the bunch charges is better than 0.02%. With this high resolution, the new BCM system is able to monitor the bunch-by-bunch beam lifetime. By using the filling pattern information, the Touschek lifetime and the vacuum lifetime can also be calculated. In this paper, the principle of the new method and the experiments is presented in detail.

关键词： Beam-current measurement Bunch-bybunch Touschek lifetime Vacuum lifetime SSRF

Oral microbiota in the oral-genitourinary axis:identifying periodontitis as a potential risk of genitourinary cancers

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Military Medical Research 2021年第4期8卷 564-578页

作者： Shuai Yuan Cheng fang Wei-Dong leng Lan Wu Bing-Hui Li Xing-Huan Wang Hailiang Hu Xian-Tao Zeng Center for Evidence-Based and Translational Medicine Zhongnan Hospital of Wuhan UniversityWuhan 430071China. Department of Stomatology Taihe HospitalHubei University of MedicineShiyan 442000China. Department of Stomatology Zhongnan Hospital of Wuhan UniversityWuhan 430071China. Department of Urology Zhongnan Hospital of Wuhan UniversityWuhan 430071China. Department of Pathology Duke University School of MedicineDurhamNC 27710USA. School of Medicine Southern University of Science and TechnologyShenzhen 518055GuangdongChina.

Periodontitis has been proposed as a novel risk factor of genitourinary cancers:although periodontitis and genitourinary cancers are two totally distinct types of disorders,epidemiological and clinical studies,have established associations between *** of oral microbiota has already been established as a major factor contributing to *** emerging epidemiological evidence and the detection of oral microbiota in genitourinary organs indicate the presence of an oral-genitourinary axis and oral microbiota may be involved in the pathogenesis of genitourinary ***,oral microbiota provides the bridge between periodontitis and genitourinary *** have carried out this narrative review which summarizes epidemiological studies exploring the association between periodontitis and genitourinary *** have also highlighted the current evidence demonstrating the capacity of oral microbiota to regulate almost all hallmarks of cancer,and proposed the potential mechanisms of oral microbiota in the development of genitourinary cancers.

关键词： Oral microbiota Oral-genitourinary axis Periodontitis Urogenital neoplasms Prostatic neoplasms Kidney neoplasms Urinary bladder neoplasms

A brief view of international conference on plant cell wall biology 2017

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Science Bulletin 2017年第20期62卷 1357-1358页

作者： Xin fang Juncong Sun Bing leng Guoan Sheng Jirong Huang Xiaoquan Qi Xiaoya Chen Laigeng Li Institute of Plant Physiology and Ecology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200032 China Institute of Botuny Chinese Academy of Sdences Beijing 100093 China Chinese Society for Plant Biology Shanghai 200031 China College of Life and Environmental Sdences Shanghai Normal University Shanghai 200234 China

The triennial International Conference on Plant Cell Wall Biology has been held 5 times since it was initiated in the United States. PCWB2017 for the first time is organized in China. The conference was attended with more than 220 participants and featured with oral and poster presentations, reflecting the contemporarv status of plant cell wall studies.

关键词： nternational conference on plant cell wall biology 2017 triennial

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进出油阀参数对高压供油泵流量的影响分析

现代车用动力 2024年第2期 38-42页

作者：张祥山崔京房征先姜伟张海涛冷涤非龙口龙泵柴油喷射高科有限公司山东烟台264000 中国北方发动机研究所天津300400

基于共轨燃油喷射系统高压供油泵模型,研究了进出油阀参数对高压供油泵流量的影响,结果表明:进油阀弹簧预紧力的大小对高压供油泵流量影响很大,过大或过小都会使高压供油泵流量减小;进油阀阀孔直径、升程过小会造成进油节流,使高压供油... 详细信息

基于共轨燃油喷射系统高压供油泵模型,研究了进出油阀参数对高压供油泵流量的影响,结果表明:进油阀弹簧预紧力的大小对高压供油泵流量影响很大,过大或过小都会使高压供油泵流量减小;进油阀阀孔直径、升程过小会造成进油节流,使高压供油泵流量减小;进油阀阀芯质量过大会使高压供油泵高转速流量减小;出油阀阀芯质量过大会造成高压供油泵流量波动。

关键词：共轨燃油喷射系统高压供油泵流量进油阀出油阀

General anesthetic agents induce neurotoxicity through oligodendrocytes in the developing brain

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Effect of Nano-ZrO_2 on Microstructure and Thermal Shock Behaviour of Al_2O_3/SiC Composite Ceramics Used in Solar Thermal Power

动物学研究 2024年第3期 691页

作者： Wen-Xin Hang Yan-Chang Yang Yu-Han Hu Fu-Quan fang Lang Wang Xing-Hua Qian Patrick M.McQuillan Hui Xiong Jian-Hang leng Zhi-Yong Hu

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Journal of Wuhan University of Technology(Materials Science) 2011年第2期26卷 285-289页

作者：徐晓虹 School of Materials Science and Engineering Wuhan University of Technology

The Al2O3-ZrO2（3Y）-SiC composite ceramics used in solar thermal power were prepared by micrometric Al2O3,nano-ZrO2 and SiC powders under the condition of pressureless *** bulk density and bending strength of samples with 10vol% nano-ZrO2 sintered at 1480℃ were 3.222 g/cm3 and 160.4MPa,*** bending strength of samples after 7 times thermal shock tests （quenching from 1000℃ to 25℃ in air medium） is 132.0MPa,loss rate of bending strength is only 17%.The effect of nano-ZrO2 content on the microstructure and performance of Al2O3-ZrO2（3Y）-SiC composite ceramic was *** experimental results show that the bending strength of samples with above 10vol% nano-ZrO2 content has decreased,because the volume expansion resulting from t-ZrO2 to m-ZrO2 phase transformation is excessive;Adding proper nano-ZrO2 would be contributed to improve the thermal shock resistance of the composite *** Al2O3-ZrO2（3Y）-SiC composite ceramic has promising potential application in solar thermal power.

关键词： Al2O3 nano-ZrO2 transformation toughening thermal shock resistance composite ceramics solar thermal power

Risk Factors And Outcome of Pancreatic Fistula after Consecutive Pancreaticoduodenectomy with Pancreaticojejunostomy for Patients with Malignant Tumor

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Chinese Journal of Cancer Research 2010年第1期22卷 32-41页

作者： Wei-hua Zhu Shu Li Da-fang Zhang Ji-run Peng Zhong-tian Jin Guang-ming Li Fu-shun Wang Ji-ye Zhu Xi-sheng leng Department of Hepatobiliary surgery Peiking University People＇s Hospital Beijing 100044 China

Objective： Pancreatic fistula （PF） is a common complication after pancreaticoduodenectomy （PD） and there is no consensus regarding the criteria to define PF. The study was undertaken to determine the risk factors for PF according to the definition of the International Study Group on Pancreatic Fistula （ISGPF） and to delineate its impact on patient outcome. Methods： Between March 1994 and May 2009, data from 153 consecutive patients with malignant tumors underwent a PD with pancreaticojejunostomy in the Peking University People＇s Hospital were recorded prospectively A total of 24 factors were examined with univariate analysis and multivariate logistic regression analysis was used to estimate relative risks, and their 95% confidence intervals （95% CI） and odds ratio （OR）. Results： Our institution belonged to medium-volume center and PF occurred in 30 patients （19.6%）. Pancreatic texture, early postoperative hemorrhage and pancreatic pathologies correlated with PF rates significantly in univariate analyses. But in multivariate regression, soft gland （OR, 4.934; 95% CI, 1.132-7.312） and early postoperative hemorrhage with conservative therapy （OR, 4.130; 95% CI, 1.057-21.112） were predictive. The mean postoperative length of stay in patients with PF was longer （32.7±23.9 versus 60.5±56.2 days） than patients without PF （P=0.001）. Overall 30-day mortality was not affected by the development of PF （P=0.657）. There was no difference in reoperation rates between patients with and without PF （10.0% versus 6.5%, P=0.787）. Concerning the sum of postoperative complications, there were 36 complications for 30 patients with PF, while 64 for 123 patients without PF. When patients with distal cholangiocarcinoma, ampullary and duodenal cancer were considered as a whole for survival analysis, the median survival for patients with PF was 20 months, whereas the median survival for patients without PF was 26 months. Kaplan-Meier survival curves for patients with and without PF were not

关键词： Pancreatieoduodenectomy Pancreatic fistula Morbidity Mortality Surgical outcome