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Distribution, failure risk and reinforcement necessity of check-dams on the Loess Plateau: a review

Journal of Mountain Science 2021年第2期18卷 499-509页

作者： GUO Wen-zhao WANG Wen-Long XU Qiang hu jian-jun Zhu Li-li State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Water and Soil ConservationNorthwest A&F UniversityYangling 712100China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China Key Laboratory of Mountain Hazards and Earth Surface Processes Chinese Academy of SciencesChengdu 610059China Xi'an Planning Design&Research InstituteUpper and middle Yellow River BureauYellow River Conservancy CommissionMinistry of Water ResourcesXi'an 710021China

Check-dams are the most important measure to control the soil and water loss in highly erodible catchments on the Chinese Loess *** on the data of check-dams from 1950 to 2014,our study roundly analyzed the regional distribution,function and the problems of check-dams on the Loess Plateau.A total of 17,094 check-dams with a storage capacity of over 100,000 m^(3) and an average density of 0.027 counts km^(-2) were installed on the Loess ***-dams’densities varied greatly in the Qinghai Province,Gansu Province,Ningxia hui Autonomous Region,Inner Mongolia Autonomous Region,Shaanxi Province,Shanxi Province and Henan *** highest density of check-dams reached 0.088 counts km^(-2) in Shaanxi Province,whereas the lowest density of check-dams was only 0.005 counts km^(-2) in Qinghai ***,after decades of operation,3025 large check-dams and 2257 medium check dams are dangerous and have security risks,which are seriously threatening downstream *** dangerous rate of checkdams is ***,the check-dams in Shanxi and Qinghai Province have the highest dangerous rates,with both exceeding 53%.Therefore,there is an urgent need for carrying out reinforcement of the dangerous *** results are helpful to policymakers to extend and develop check-dams.

关键词： Check-dam Soil erosion Sediment Gully Dam failure Chinese Loess Plateau

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Role of Kasai procedure in surgery of hilar bile duct strictures

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World Journal of Gastroenterology 2011年第37期17卷 4231-4234页

作者： Jin-Bo Gao Li-Shan Bai Zhi-jian hu jun-Wei Wu Xin-Qun Chai Department of Hepatobiliary Surgery Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430022 Hubei Province China

AIM:To assess the application of the Kasai procedure in the surgical management of hilar bile duct ***:Ten consecutive patients between 2005 and 2011 with hilar bile duct strictures who underwent the Kasai procedure were retrospectively *** portoenterostomy with the placement of biliary stents was performed in all *** characteristics,postoperative complications,and long-term outcomes were *** patients were followed up for 2-60 mo ***:Patients were classified according to the Bismuth classification of biliary *** were two Bismuth Ⅲ and eight Bismuth Ⅳ *** lesions were benign and four were *** the benign lesions,three were due to post-cholecystectomy injury,one to trauma,one to inflammation,and one to inflammatory *** the malignant lesions,four were due to hilar *** patients underwent Kasai portoenterostomy with the placement of biliary *** were no perioperative *** patient experienced anastomotic leak and was managed *** other complications occurred *** the follow-up period,all patients reported a good quality of ***:The Kasai procedure combined with biliary stents may be appropriate for patients with hilar biliary stricture that cannot be managed by standard surgical methods.

关键词： Kasai procedure Hilar bile duct Stricture Surgery

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Some Remarks on an Integral Inequality

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Chinese Quarterly Journal of Mathematics 2008年第4期23卷 554-558页

作者： hu jian-jun College of Science Zhejiang University Hangzhou 310058 China

Given two positive constants α and β, we prove that the integral inequality ∫_0^1f^α＋β（x）dx≥∫_0^1∫^α（x）x^β dx holds for all non-negative valued continuous functions ∫ satisfying ∫_x^1f（t）dt≥∫_x^1t... 详细信息

关键词： integral inequality continuous function

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Parameter design and performance analysis of zero inertia continuously variable transmission system

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Journal of Central South University 2015年第1期22卷 180-188页

作者：胡建军吉毅晏玖江 State Key Laboratory of Mechanical Transmission (Chongqing University)

In order to solve the problem of weak power performance of vehicle equipped with continuously variable transmission(CVT) system working under transient operating conditions, a new CVT equipped with planetary gear mechanism and flywheel was researched, a design method of transmission parameter optimization was proposed, and the comprehensive matching control strategy was established for the new transmission system. Fuzzy controllers for throttle opening and CVT speed ratio were designed, and power performance and fuel economy of both vehicles respectively equipped with conventional CVT system and new transmission system wrere compared and analyzed by simulation. The results show that power performance and fuel economy of the vehicle equipped with new transmission system are better than that equipped with conventional CVT, thus the rationality of the parameter design method and control algorithm are verified.

关键词： continuously variable transmission inertia optimization fuzzy control simulation

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基于节能发电调度和国际贸易理念的电力市场竞争机制

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电力系统自动化 2008年第24期32卷 35-38,73页

作者：胡建军广东省电力调度中心广东省广州市510600

介绍了电力市场必须解决的几个问题,结合中国实际情况,基于节能发电调度和国际贸易理念提出了一套电力市场竞争机制,并进行了深入的分析和探讨。模拟实例表明,所提出的电力市场竞争机制能有效解决目前中国电力市场中存在的区域资源优化... 详细信息

介绍了电力市场必须解决的几个问题,结合中国实际情况,基于节能发电调度和国际贸易理念提出了一套电力市场竞争机制,并进行了深入的分析和探讨。模拟实例表明,所提出的电力市场竞争机制能有效解决目前中国电力市场中存在的区域资源优化配置与区域经济协调发展相结合的问题、电网公司购电风险问题,可以将节能发电调度、环保排放与电力市场有机协调起来,用市场机制而不是行政机制来实现节能发电调度和环保排放。

关键词：竞争机制电力市场节能发电调度国际贸易

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压水堆核电厂失水事故后安全壳内产氢量计算研究

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核动力工程 2013年第S1期34卷 95-98页

作者：胡建军中国核动力研究设计院核反应堆系统设计技术重点实验室成都610041

采用ORIGEN2程序对压水堆核电厂失水事故工况下堆芯区和地坑区氢气的产生量进行计算,以合理减少安全壳内可燃气体的控制设计评价的保守性。通过冷却剂的辐照分解产氢以及其他相关计算模型,对600MW(电功率)级压水堆核电厂失水事故工况下... 详细信息

采用ORIGEN2程序对压水堆核电厂失水事故工况下堆芯区和地坑区氢气的产生量进行计算,以合理减少安全壳内可燃气体的控制设计评价的保守性。通过冷却剂的辐照分解产氢以及其他相关计算模型,对600MW(电功率)级压水堆核电厂失水事故工况下的氢气产生量进行计算。计算结果表明原评价结果过于保守,在核电厂失水事故后仍有充分的时间准备投入安全壳内氢气复合器。

关键词：压水堆核电厂失水事故 ORIGEN2 产氢量分析

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Protective effect of recombinant human IL-1Ra on CCl_4-induced acute liver injury in mice

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World Journal of Gastroenterology 2010年第22期16卷 2771-2779页

作者： Zhu, Run-Zhi Xiang, Di Xie, Chao Li, Jing-Jing hu, jian-jun He, Hong-Lin Yuan, Yun-Sheng Gao, Jin Han, Wei Yu, Yan Shanghai Jiao Tong Univ Sch Agr & Biol Shanghai Municipal Key Lab Vet Biotechnol Shanghai 200240 Peoples R China Shanghai Jiao Tong Univ Lab Regenerat Sch Pharm Shanghai 200240 Peoples R China Cornell Univ Dept Food Sci Ithaca NY 14853 USA Shanghai Jiao Tong Univ Coll Med Shanghai Peoples Hosp 6 Dept Infect Dis Shanghai 200233 Peoples R China

AIM: To evaluate the effects of positive regulation of recombinant human interleukin 1 receptor antagonist (rhIL-1Ra) on hepatic tissue recovery in acute liver injury in mice induced by carbon tetrachloride (CCl 4 ). METHODS: Acute liver damage was induced by injecting 8-wk-old mice with CCl 4 1 mL/kg (1:3 dilution in corn oil) intraperitoneally (ip). Survival after liver failure was assessed by injecting 8-wk-old mice with a lethal dose of CCl 4 2.6 mL/kg (1:1 dilution in corn oil) ip. Mice were subcutaneously injected with 1 mg/kg recombinant human IL-1Ra twice a day after CCl 4 treatment for 5 d. Serum alanine amino transferase (ALT) and aspartate aminotransferase (AST) levels were determined with a commercial assay kit. Serum IL-1β, IL-1Ra levels were measured by enzyme-linked immunosorbent assay kit. Quantitative real-time polymerase chain reaction was used to determine liver IL-1β, IL-1Ra and IL-6 expression during CCl 4-induced acute liver injury. Liver sections were stained with hematoxylin-eosin. A histology-injury grading system was used to evaluate the degree of necrosis after acute liver injury. Proliferating cell nuclear antigen (PCNA) staining was used to evaluate the role of rhIL-1Ra in promoting hepatocyte proliferation. RESULTS: Quantitative analysis showed a higher level of IL-6 mRNA expression and reduced serum AST and ALT levels in the livers of the rhIL-1Ra-treated group at the early phase of CCl 4-induced acute liver injury. Histological examination indicated a decrease in centrilobular necrotic areas in mice treated with rhIL-1Ra, and a novel role of rhIL-1Ra in promoting hepatocyte proliferation was also supported by an increase of PCNA staining. All these results, accompanied by a strong survival benefit in rhIL-1Ra-treated vs PBS-treated groups, demonstrated that rhIL-1Ra administration ameliorated the histological damage and accelerated the regeneration and recovery process of the liver. CONCLUSION: rhIL-1Ra could be further developed as a

关键词： Recombinant human interleukin 1 receptor antagonist Carbon tetrachloride Liver injury Hepatocyte proliferation

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Flow measurement and parameter optimization of right-angled flow passage in hydraulic manifold block

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Journal of Central South University 2019年第4期26卷 852-864页

作者： hu jian-jun CHEN Jin QUAN Ling-xiao KONG Xiang-dong School of Mechanical Engineering Yanshan University School of Civil Engineering and Mechanics Yanshan University Engineering Research Center of Advanced Forging & Stamping Technology and Science Built by Central Government and Local Government Yanshan University

This study was conducted to investigate the flow field characteristics of right-angled flow passage with various cavities in the typical hydraulic manifold block.A low-speed visualization test rig was developed and the flow field of the right-angled flow passage with different cavity structures was measured using 2D-PIV *** model was established to simulate the three-dimensional flow *** eddy viscosity turbulence models were investigated in predicting the flow field by comparing against the particle image relocimetry(PIV)measurement *** defining the weight error function K,the S-A model was selected as the appropriate turbulence ***,a three-factor,three-level response surface numerical test was conducted to investigate the influence of flow passage connection type,cavity diameter and cavity length-diameter ratio on pressure *** results show that the Box-Benhnken Design(BBD)model can predict the total pressure loss *** optimal factor level appeared in flow passage connection type II,14.64 mm diameter and 67.53%cavity length-diameter *** total pressure loss decreased by 11.15%relative to the worst factor level,and total pressure loss can be reduced by 64.75%when using an arc transition right-angled flow passage,which indicates a new direction for the optimization design of flow passage in hydraulic manifold blocks.

关键词： flow measurement particle image relocimetry right-angled flow passage parameter optimization

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基因表达式编程中的精英个体产生策略

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华南理工大学学报（自然科学版） 2009年第1期37卷 102-105页

作者：胡建军彭宏华南理工大学计算机科学与工程学院广东广州510006

为提高基因表达式编程(GEP)算法的进化效率,提出了一种用于产生GEP初始种群的精英个体产生策略.该策略通过逐步扩大染色体到目标值的距离,采用随机方式在较短时间内产生具有较高个体适应度的染色体,从而在初始种群中快速产生精英个体,... 详细信息

为提高基因表达式编程(GEP)算法的进化效率,提出了一种用于产生GEP初始种群的精英个体产生策略.该策略通过逐步扩大染色体到目标值的距离,采用随机方式在较短时间内产生具有较高个体适应度的染色体,从而在初始种群中快速产生精英个体,使种群可以从一个较高的基础上开始进化,缩短了GEP算法的进化距离,从而提高了种群的进化效率.实验结果表明,在GEP算法挖掘函数的过程中,采用文中提出的策略,可以使GEP算法的进化效率提高17%.

关键词：遗传算法基因表达式编程进化效率精英函数挖掘初始种群

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纯电动汽车复合储能系统参数匹配及控制策略

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中国公路学报 2018年第3期31卷 142-150页

作者：胡建军郑勇胡志华肖军重庆大学汽车工程学院重庆400044 重庆大学机械传动国家重点实验室重庆400044

为了解决纯电动汽车用动力电池功率密度低、大电流充放电能力差和循环使用寿命短等问题,以超级电容与动力电池组成的复合储能系统为研究对象,提出了基于典型循环工况的复合储能系统参数匹配优化方法;在满足各循环工况对复合储能系统能... 详细信息

为了解决纯电动汽车用动力电池功率密度低、大电流充放电能力差和循环使用寿命短等问题,以超级电容与动力电池组成的复合储能系统为研究对象,提出了基于典型循环工况的复合储能系统参数匹配优化方法;在满足各循环工况对复合储能系统能量需求与功率需求的前提下,以动力电池容量和超级电容容量为优化变量,对复合储能系统总成本与总质量进行了多目标优化。在此基础上,根据电机需求功率及超级电容荷电状态,以减小动力电池输出电流为目标,制订了基于滤波思想的基本规则控制策略;为更好地适应不同的循环工况,提出了复合模糊控制策略,其中主模糊控制器基于电机功率需求、动力电池荷电状态和超级电容荷电状态得到动力电池输出功率初次分配系数,子模糊控制器根据电机功率需求和超级电容当前荷电状态与其目标值的差值得到动力电池输出功率修正系数,二者协同作用得到动力电池最佳输出功率,并对整车动力性、经济性、动力电池电流和温度特性进行了仿真分析。结果表明:采用所提出的复合储能系统及2种控制方法与单一动力电池的纯电动汽车相比,百公里加速时间分别缩短了6.89%和9.85%,NYCC工况下总能耗分别降低了14.15%和19.08%,动力电池最大电流分别降低了63.4%和65.17%,动力电池温升分别降低了22.87%和61.53%。

关键词：汽车工程复合储能系统参数匹配及控制策略整车性能

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