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Safety of high-carbohydrate fluid diet 2 h versus overnight fasting before non-emergency endoscopic retrograde cholangiopancreatography:A single-blind,multicenter,randomized controlled trial

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Chinese Medical Journal 2024年第12期137卷 1437-1446页

作者： Wenbo Meng Joseph W.Leung Zhenyu Wang Qiyong Li Leida zhang Kai zhang Xuefeng Wang Meng Wang Qi Wang Yingmei Shao Jijun zhang Ping Yue Lei zhang Kexiang Zhu Xiaoliang Zhu Hui zhang Senlin Hou Kailin Cai Hao Sun Ping Xue Wei Liu Haiping Wang Li zhang Songming Ding Zhiqing Yang Ming zhang Hao Weng QingyuanWu Bendong Chen Tiemin Jiang Yingkai Wang Lichao zhang Ke Wu Xue Yang Zilong Wen Chun Liu LongMiao Zhengfeng Wang Jiajia Li Xiaowen Yan Fangzhao Wang lingen zhang Mingzhen Bai Ningning Mi Xianzhuozhang Wence Zhou Jinqiu Yuan Azumi Suzuki Kiyohito Tanaka Jiankang Liu Ula Nur Elisabete Weiderpass Xun Li Department of General Surgery The First Hospital of Lanzhou UniversityLanzhouGansu 730000China Key Laboratory of Biological Therapy and Regenerative Medicine Transformation Gansu Province LanzhouGansu 730000China Division of Gastroenterology and Hepatology UC Davis Medical CenterSacramentoCA 95816USA Department of Minimally Invasive Surgery Tianjin Nankai HospitalTianjin 300100China Division of Hepatobiliary and Pancreatic Surgery Department of SurgeryShulan(Hangzhou)Hospital Affiliated to Zhejiang Shuren UniversityHangzhouZhejiang 310000China Department of Hepatobiliary Surgery Southwest HospitalArmy Medical UniversityChongqing 400000China Hepatobiliary Surgery Department Shandong Provincial Third HospitalJinanShandong 250000China Department of General Surgery Xinhua HospitalAffiliated to Shanghai Jiao Tong University School of MedicineShanghai Key Laboratory of Biliary Tract Disease ResearchShanghai 200000China Department of Hepatobiliary and Pancreatic Surgery The First Hospital of Jilin UniversityChangchunJilin 130000China Department of Hepatobiliary Surgery The General Hospital of Ningxia Medical UniversityYinchuanNingxia 750000China Department of Hepatobiliary&Hydatid Digestive and Vascular Surgery CenterXinjiang Key Laboratory of Echinococcosis and Liver Surgery ResearchThe First Affiliated Hospital of Xinjiang Medical UniversityUrumqiXinjiang 830000China Department of Hepatobiliary and Pancreatic Surgery The First Hospital of Shanxi Medical UniversityTaiyuanShanxi 030000China Department of General Surgery The Second Hospital of Lanzhou UniversityLanzhouGansu 730000China Department of Biliopancreatic Endoscopic Surgery The Second Hospital of Hebei Medical UniversityShijiazhuangHebei 050000China Gastrointestinal Surgery Department Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei 430000China Department of Hepatobiliary Surgery The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’anShaanxi 710000China Depart

Background:Although overnight fasting is recommended prior to endoscopic retrograde cholangiopancreatography(ERCP),the benefits and safety of high-carbohydrate fluid diet(CFD)intake 2 h before ERCP remain *** study aimed to analyze whether high-CFD intake 2 h before ERCP can be safe and accelerate patients’***:This prospective,multicenter,randomized controlled trial involved 15 tertiary ERCP centers.A total of 1330 patients were randomized into CFD group(n=665)and fasting group(n=665).The CFD group received 400 mL of maltodextrin orally 2 h before ERCP,while the control group abstained from food/water overnight(>6 h)before *** ERCP procedures were performed using deep sedation with intravenous *** investigators were blinded but not the *** primary outcomes included postoperative fatigue and abdominal pain score,and the secondary outcomes included complications and changes in metabolic *** outcomes were analyzed according to a modified intention-to-treat ***:The post-ERCP fatigue scores were significantly lower at 4 h(4.1±2.6 vs.4.8±2.8,t=4.23,P<0.001)and 20 h(2.4±2.1 vs.3.4±2.4,t=7.94,P<0.001)in the CFD group,with least-squares mean differences of 0.48(95%confidence interval[CI]:0.26-0.71,P<0.001)and 0.76(95%CI:0.57-0.95,P<0.001),*** 4-h pain scores(2.1±1.7 vs.2.2±1.7,t=2.60,P=0.009,with a least-squares mean difference of 0.21[95%CI:0.05-0.37])and positive urine ketone levels(7.7%[39/509]vs.15.4%[82/533],χ^(2)=15.13,P<0.001)were lower in the CFD *** CFD group had significantly less cholangitis(2.1%[13/634]vs.4.0%[26/658],χ^(2)=3.99,P=0.046)but not pancreatitis(5.5%[35/634]vs.6.5%[43/658],χ^(2)=0.59,P=0.444).Subgroup analysis revealed that CFD reduced the incidence of complications in patients with native papilla(odds ratio[OR]:0.61,95%CI:0.39-0.95,P=0.028)in the multivariable ***:Ingesting 400 mL of CFD 2 h before ERCP is safe,with a reduction in post-ERCP fatigue,

关键词： Endoscopic retrograde cholangiopancreatography ERCP Carbohydrate Fasting Safety Complications Enhanced recovery after surgery Randomized controlled trial

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非线性对流占优扩散方程经济型差分流线扩散法无网格比超收敛分析

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计算数学 2024年第1期46卷 99-115页

作者：石东洋张林根烟台大学数学与信息科学学院烟台264005 郑州大学数学与统计学院郑州450001

本文主要用经济型差分流线扩散(EFDSD)法研究非线性对流占优扩散方程的向后Euler(BE)全离散有限元格式,并在时间步长τ和空间剖分参数h的比值无约束下,导出H1模意义下具有O(h2+τ)阶的超收敛性质.首先,引入时间离散系统,将误差分为时间... 详细信息

本文主要用经济型差分流线扩散(EFDSD)法研究非线性对流占优扩散方程的向后Euler(BE)全离散有限元格式,并在时间步长τ和空间剖分参数h的比值无约束下,导出H1模意义下具有O(h2+τ)阶的超收敛性质.首先,引入时间离散系统,将误差分为时间误差和空间误差两部分,并利用数学归纳法,通过时间误差给出了时间离散方程解的正则性.其次利用空间误差导出有限元解的W0,∞模的有界性,再借助插值后处理技巧得到了H1模意义下的无网格比的超逼近和整体超收敛结果.最后,通过数值例子对理论分析的正确性和算法的高效性予以了验证.

关键词：非线性对流占优扩散方程 EFDSD法有限元方法无网格比约束超逼近及超收敛

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非线性抛物型积分微分方程Galerkin有限元方法超收敛分析

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信阳师范学院学报（自然科学版） 2024年第1期37卷 45-50页

作者：石东洋张林根郑州大学数学与统计学院河南郑州450001

主要研究非线性抛物型积分微分方程的协调Galerkin有限元方法Crank-Nicolson(CN)全离散格式。通过对非线性项的精细估计,采用插值与投影相结合的估计技巧,导出了L^(∞)(H^(1))模意义下具有O(h^(2)+τ^(2))阶的超逼近性质。进一步利用插... 详细信息

主要研究非线性抛物型积分微分方程的协调Galerkin有限元方法Crank-Nicolson(CN)全离散格式。通过对非线性项的精细估计,采用插值与投影相结合的估计技巧,导出了L^(∞)(H^(1))模意义下具有O(h^(2)+τ^(2))阶的超逼近性质。进一步利用插值后处理技术得到了整体超收敛结果,弥补了以往文献的不足。同时,通过数值例子验证了理论分析的正确性和方法的高效性。

关键词：非线性抛物型积分微分方程协调Galerkin有限元方法超逼近超收敛

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Constructal design of a rectangular parallel phase change microchannel in a three-dimensional electronic device

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Science China(Technological Sciences) 2024年第5期67卷 1381-1390页

作者： zhang JiWen FENG HuiJun CHEN lingen GE YanLin Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan430205China College of Power Engineering Naval University of EngineeringWuhan430033China Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment Wuhan430205China School of Mechanical&Electrical Engineering Wuhan Institute of TechnologyWuhan430205China

Based on constructal theory,a rectangular parallel phase change microchannel model in a three-dimensional electronic device(TDED)is established with R134a as the cooling *** on the minimization of a complex function(CF)composed of linear weighting sum of maximum temperature difference and pumping power consumption,constructal design of the TDED is conducted first;and then,maximum temperature difference and pumping power consumption are minimized by non-dominated sorting genetic algorithm-II *** results reveal that there exist an optimal mass flow rate(0.0012 kg/s)and a quadratic optimal aspect ratio(AR)(0.39)of the microchannel which lead to quadratic minimum CF(0.817).Compared with the original value,the CF after optimization is reduced by 18.34%.Reducing the inlet temperature of cooling fluid and microchannel number appropriately can help to enhance the overall performance of *** using the artificial neural network and genetic algorithms in the toolboxes of Matlab software,the optimal AR gained in the Pareto solution set is located between 0.2–*** smallest deviation index among three discussed strategies is 0.346,and the corresponding optimal AR is 0.413,which is selected as the optimal design strategy of the microchannel in the TDED under multiple *** findings in this study can serve as theoretical guides for thermal designs of electronic devices.

关键词： constructal theory parallel microchannel evaporation phase change three-dimensional electronic device multi-objective optimization artificial neural network

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Climate change:Impact on the Arctic,Antarctic and Tibetan Plateau

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Advances in Polar Science 2011年第2期22卷 67-73页

作者： LU LongHua BIAN lingen zhang ZhengQiu Chinese Academy of Meteorological Sciences Beijing 100081 China

The Arctic, Antarctic and Tibetan Plateau are very sensitive to global climate change. Hence, it is urgent that we improve our understanding ot＇ how they respond to climate change, and how those responses in turn affect both regional and global climate. Against a background of current global warming, the three poles display climate diversities temporarily and spatially, which to different degrees affect the weather and climate over China. Enhanced monitoring of climate change in these three areas, as well as connected work on the responses and feedbacks of the three regions to climate change, will provide necessary support for adaptation and the sustainable development of the Chinese economy.

关键词： Three poles Tibetan Plateau climate change global change scientific research climate change adaptation

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MEDIUM-RANGE OSCILLATION OF METEOROLOGICAL ELEMENTS AT GREAT WALL STATION,ANTARCTICA

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Chinese Journal of Polar Science 1990年第1期1卷 36-48页

作者： Lu Longhua Bian lingen zhang Yongping Polar Meteorological Laboratory, Academy of Meteorological Sciences, Beijing 100081

A method of multi-spectral analysis is used to study the spectral characteristics of surface and upper-level meteorological elements over the Great Wall Station (62°12'S, 58°57'W), Antarctica and their phasecorrelation, propagation of mean oscillation at 500hPa level in the Southern Hemisphere and their corresponding synoptic sense. the results are summed up as follows: 1. Over the sub-Antatctic zone, as in the Northern Hemisphere there generally exist quasi-weekly oscillation and quasi-biweekly oscillation. In different seasons the oscillations of meteorological elements are different: in winter season quasi-biweekly oscillation is dominant, while in summer season quasi-weekly oscillation is dominant. 2. From the Earth's surface to the lower stratosphere there is a distinct quasi-weekly oscillation at each isobaric surface, but the most intense oscillation appears at 200-300hPa, and the oscillations of height and temperature are propagated downward. 3. Both in winter and summer seasons the quasi-biweekly oscillation are propagated from west to east, and the mean velocity of its propagation is about 7-17 longtitude / day. 4. The quasi-biweekly oscillation and the quasi-weekly oscillation over the sub - Antarctic zone are closely related to the activity and intensity variation of polar vortex at 500hPa, while at 1000hPa they reflect an interaction between the circumpolar depression and the sub-tropical high. The quasi-biweekly oscillation may be a reflection of inherent oscillation of the polar vortex, where as the quasi-weekly oscillation is a result of forced oscillation by external disturbance.A large number of calculations and analysis made reveals the features of medium-range oscillation over the sub-Antarctic zone. The results are of significance for understanding the behaviour of synoptic dynamics and making the weather forecast.This work is supported by National Committee for Antarctic Research.

关键词： Antarctic Great Wall Station Meteorological elements Multi-spectral analysis method Medium-range oscillation Polar vortex.

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封闭条件下温度对气隙放电影响的模拟研究

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电机与控制学报 2024年第2期28卷 1-10页

作者：郑全福张钊棋罗林根盛戈皞江秀臣上海交通大学电气工程系上海200240

气隙缺陷往往导致局部放电(PD)现象,局放的发展过程与放电条件密切相关,通过放电的宏观表征来分析判断放电条件,是实现绝缘条件评估的重要途径。以温度对气隙缺陷下局放过程的影响为例,通过建立温度条件对放电过程的参数控制模型,研究... 详细信息

气隙缺陷往往导致局部放电(PD)现象,局放的发展过程与放电条件密切相关,通过放电的宏观表征来分析判断放电条件,是实现绝缘条件评估的重要途径。以温度对气隙缺陷下局放过程的影响为例,通过建立温度条件对放电过程的参数控制模型,研究了不同温度对其微观发展过程的影响,得到了不同温度条件下的宏观表征。仿真研究表明,在封闭条件下,温度的升高会影响放电过程中的电子密度分布以及电场分布。在303、323和343 K的条件下模拟放电过程,其电流峰值依次为0.479、0.356和0.261 A,随温度升高逐渐下降;此外其电流脉冲持续时间依次为19.261、15.516和13.438 ns,随温度升高逐渐变短。最后,实地测量了不同温度下的放电电流,获得了与仿真模型一致的结果。

关键词：局部放电温度流体模型放电电流气隙缺陷参数控制

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舰艇水下非声隐身试验与测试技术发展与展望

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计算机测量与控制 2009年第4期17卷 625-627页

作者：张林根张琼哈尔滨工程大学黑龙江哈尔滨150001 大连测控技术研究所辽宁大连116013

随着声隐身技术的发展,声探测手段面临挑战,非声探测手段作用日趋显著,以至舰艇水下非声隐身性能越来越受到各国所重视,舰艇水下非声隐身试验与测试技术也得到相应的发展;文中回顾了舰艇水下非声隐身试验与测试技术的发展概况,分析了我... 详细信息

随着声隐身技术的发展,声探测手段面临挑战,非声探测手段作用日趋显著,以至舰艇水下非声隐身性能越来越受到各国所重视,舰艇水下非声隐身试验与测试技术也得到相应的发展;文中回顾了舰艇水下非声隐身试验与测试技术的发展概况,分析了我国舰艇水下非声(电场、磁场、交变电磁场和红外等)物理场隐身试验与测试技术的特点与存在的问题,指出大力发展固定试验场测试技术是提高舰艇水下非声隐身试验与测试技术水平和能力的必由之路,同时根据我国现有条件,简述了非试验场条件下提升舰艇水下非声隐身试验与测试技术能力的必要性和发展方向。

关键词：舰艇非声隐身测试

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气隙长度对大气压下环氧树脂阻挡放电的影响研究

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电机与控制学报 2024年第5期28卷 17-26页

作者：张梦瑶郑全福罗林根盛戈皞江秀臣上海交通大学电气工程系上海200240

为了研究气隙长度对大气压下介质阻挡放电的影响机制,从而进一步明晰介质阻挡放电的放电机理及特性,基于气体放电流体模型,针对长度3 mm以下的环氧树脂阻挡同轴电极气隙,在外施电场恒定的条件下对其放电微观过程进行仿真,从带电粒子微... 详细信息

为了研究气隙长度对大气压下介质阻挡放电的影响机制,从而进一步明晰介质阻挡放电的放电机理及特性,基于气体放电流体模型,针对长度3 mm以下的环氧树脂阻挡同轴电极气隙,在外施电场恒定的条件下对其放电微观过程进行仿真,从带电粒子微观运动角度研究气隙长度对气隙放电特性的影响。仿真结果表明:在长度小于3 mm的气隙中,环氧树脂的阻挡导致电子崩无法发展成为流注,其放电形式为汤森放电;气隙长度对放电过程的影响主要通过改变带电粒子的分布和电场强度来实现;气隙长度对放电发展速度几乎没有影响;当电子崩靠近较短气隙的阳极时,其崩头密度低于较长气隙;随着气隙长度的增加,放电电流峰值增大,上升速度和降落速度增加,脉冲宽度减小。通过对比理论计算与实验结果,证明了仿真方法的合理性。

关键词：介质阻挡放电气隙长度汤森放电电子崩流体模型放电电流

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氮碳共渗在TY95系列柴油机球铁凸轮轴上的应用

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金属热处理 1999年第6期24卷 33-33,40页

作者：张林根戴玉同江苏江淮动力股份有限公司

１前言ＴＹ９５系列柴油机是我厂开发研制的多缸产品。由于该机型具有马力大、转速高等优点，因而产品的市场占有率较高。我们对ＴＹ９５系列柴油机凸轮轴一直采用等温淬火工艺，用户反映，凸轮轴变形量大，表面早期磨损现象严重。鉴于... 详细信息

１前言ＴＹ９５系列柴油机是我厂开发研制的多缸产品。由于该机型具有马力大、转速高等优点，因而产品的市场占有率较高。我们对ＴＹ９５系列柴油机凸轮轴一直采用等温淬火工艺，用户反映，凸轮轴变形量大，表面早期磨损现象严重。鉴于上述因素，我们拟用氮碳共渗工艺在多...

关键词：柴油机凸轮轴球墨铸铁氮碳共渗

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