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Effect of Room Temperature Ultrasonic Vibration Compression on the Microstructure Evolution and Mechanical Properties of AZ91 Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1135-1146页

作者： Ziyue Xu Huan liu Luyao li Chao Sun Xi Tan Baishan Chen Qiangsheng Dong Yuna Wu jinghua Jiang Jiang Ma College of Materials Science and Engineering Hohai UniversityNanjing210000China Suzhou Research Institute of Hohai University Suzhou215000China Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060China Institute of Medical Devices(Suzhou) Southeast UniversitySuzhou215163China Institute for Advanced Study Central South UniversityChangsha410083China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of TechnologyNanjing211167China

To investigate the potential of direct ultrasonic vibration on improving the performance of magnesium alloys,this study first employed the ultrasonic vibration compression(UVC)on the solid solution treated AZ91 alloy,and explored its microstructure evolution and mechanical properties under *** only two seconds,the UVC alloys showed large deformation strains of 34.8–54.4%,and sudden increase of sample temperature to 243℃.Microstructure characterizations proved that UVC promoted the formation of abundant shear bands,fine grains,and the bimodal distribution of Mg17Al12 precipitates consisting of submicron particles located within the shear bands and nano-sized ones within the *** to the unique microstructure,the micro-hardness(and nano-hardness)value of UVC alloy was increased by 37.7%(35%)when compared with the solution-treated ***,the nano-modulus of the developed AZ91 alloy was also significantly increased to 62 GPa by statistical nanoindentation tests,which could be ascribed to increased Mg_(17)Al_(12) precipitates and decreased c/a value to some *** general,this work provides a new insight into the design and preparation of high-performance magnesium alloys by UVC at room temperature.

关键词： AZ91 alloys Ultrasonic vibration compression Precipitation Shear bands Mechanical properties

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兼顾技术性和经济性的储能辅助调峰组合方案优化

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电力系统自动化 2017年第9期41卷 44-50,150页

作者：黎静华汪赛广西电力系统最优化与节能技术重点实验室(广西大学) 广西壮族自治区南宁市530004

高比例可再生能源发电并网给电力系统调峰带来了较大压力,应用储能辅助调峰是解决系统调峰问题的有效途径,但现阶段储能的高成本限制了其规模化应用。为充分发挥有限储能的调峰作用,降低储能调峰的容量需求,文中提出一种储能与正常调峰... 详细信息

高比例可再生能源发电并网给电力系统调峰带来了较大压力,应用储能辅助调峰是解决系统调峰问题的有效途径,但现阶段储能的高成本限制了其规模化应用。为充分发挥有限储能的调峰作用,降低储能调峰的容量需求,文中提出一种储能与正常调峰、深度调峰、投油调峰和启停调峰等常规手段优化组合调峰的实用方法。分别建立基于年调峰不足概率的技术性指标和基于年调峰费用的经济性指标的计算模型,构建组合调峰方案的技术性指标曲面和经济性指标曲面,将两个曲面交线处的组合调峰方案作为不同可再生能源渗透水平下电力系统的组合调峰优化方案。最后,以含风电、光伏发电的区域型系统和规划的全国系统为例,制定和分析了不同可再生能源渗透率下系统的组合调峰优化方案。

关键词：储能组合调峰技术性指标经济性指标可再生能源并网

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矮秆酿造型高粱新品种克杂17号的选育及栽培技术

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黑龙江农业科学 2024年第8期 118-121页

作者：孙邦升杨广东胡尊艳郝智勇李菁华陈林琪黑龙江省农业科学院克山分院黑龙江齐齐哈尔161005

为了推广适宜在黑龙江省机械化栽培的高产、优质矮秆酿造型高粱新品种克杂17号,本文介绍其选育经过、特征特性、产量表现、栽培技术和制种技术要点。克杂17号为黑龙江省农业科学院克山分院杂粮团队以不育率100%的早熟不育系克26A为母本... 详细信息

为了推广适宜在黑龙江省机械化栽培的高产、优质矮秆酿造型高粱新品种克杂17号,本文介绍其选育经过、特征特性、产量表现、栽培技术和制种技术要点。克杂17号为黑龙江省农业科学院克山分院杂粮团队以不育率100%的早熟不育系克26A为母本,以中早熟矮秆恢复系克恢46为父本,经杂交测配育成的矮秆、早熟、高产的酿造型高粱新品种。2018-2019年参加黑龙江省高粱区域试验,平均产量7668.09 kg·hm^(-2),比对照品种绥杂7号增产11.13%。2021年获得高粱新品种登记,登记编号为GPD高粱(2021)230014。克杂17号株高92.05 cm,穗长26.30 cm,叶片数12片,各方面性状优良,完全符合现阶段种植区域对酿造型高粱品种特性的总体要求。该品种适宜在黑龙江省北部高寒地区第二、第三、第四积温带种植。

关键词：酿造高粱克杂17号矮秆栽培技术

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基于模式搜索算法的电力系统机组组合问题

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电工技术学报 2009年第6期24卷 121-128页

作者：黎静华韦化广西大学电气工程学院南宁530004

机组组合问题是一个复杂的大型混合整数非线性规划问题,目前尚未找到理想的解决方法。本文提出一种用于混合变量的模式搜索方法(GPSMV)解决机组组合问题。该方法能求解非凸、非线性、不可微甚至不连续的规划问题,理论上能保证全局收敛... 详细信息

机组组合问题是一个复杂的大型混合整数非线性规划问题,目前尚未找到理想的解决方法。本文提出一种用于混合变量的模式搜索方法(GPSMV)解决机组组合问题。该方法能求解非凸、非线性、不可微甚至不连续的规划问题,理论上能保证全局收敛于稳定的解,其仅需要求目标函数及由约束条件构成的障碍函数值而不需要对目标函数和约束条件求导。在优化过程中离散变量作为独立的变量,而不是把原问题分成离散和连续两层来处理,适合于求解离散和连续的混合变量问题。最后对10～100机,26机24时段等六个系统进行仿真试验验证该算法。

关键词：机组组合过滤算法模式搜索算法离散变量混合变量

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A review on COVID-19 transmission,epidemiological features,prevention and vaccination

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Medical Review 2022年第1期2卷 23-49页

作者： Yuqin Zhang Gonghua Wu Shirui Chen Xu Ju Wumitijiang Yimaer Wangjian Zhang Shao lin Yuantao Hao Jing Gu jinghua li School of Public Health Sun Yat-Sen UniversityGuangzhou510080 China Sun Yat-Sen University Global Health Institute School of Public Health and Institute of State GovernanceSun Yat-Sen UniversityGuangzhou510080China Department of Environmental Health Sciences School of Public HealthUniversity at AlbanyState University of New YorkRensselaerNYUSA

Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)has caused hundreds of millions of infections and millions of deaths over past two ***,many countries have still not been able to take the pandemic under *** this review,we systematically summarized what we have done to mitigate the COVID-19 pandemic,from the perspectives of virus transmission,public health control measures,to the development and vaccination of COVID-19 *** a virus most likely coming from bats,the SARS-CoV-2 may transmit among people via airborne,faecal-oral,vertical or foodborne ***-analysis suggested that the R0 of COVID-19 was 2.9(95%CI:2.7–3.1),and the estimates in Africa and Europe could be *** median Rt could decrease by 23–96%following the nonpharmacological interventions,including lockdown,isolation,social distance,and face mask,*** intervention and lockdown were the most effective measures to control the *** to the pooled R0 in our meta-analysis,there should be at least 93.3%(95%CI:89.9–96.2%)people being vaccinated around the *** amount of vaccines and the inequity issues in vaccine allocation call for more international cooperation to achieve the antiepidemic goals and vaccination fairness.

关键词： coronavirus COVID-19 pandemic review SARS-CoV-2

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DESIGN A POCKET MULTI-BIT MULTIPliER IN FPGA

DESIGN A POCKET MULTI-BIT MULTIPLIER IN FPGA

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1996第二届国际专用集成电路会议（上海）

作者： jinghua li Yuyuan Du Jun Wang Northeast University

＜正＞Multi-bit multiplier is a arithmetic unit which is. often used in digital electronic system and digital signal *** are two kinds of algorithm to perform multi-bit *** to the algorithm given in the article,two kinds of simple multi-bit multiplier is *** with the structure of combinational multiplier and sequential multiplier,the article give a discussion about the delay and resource utilization ration of FPGA The sequential multiplier has more pocket structure than the combinational *** sequential multiplier,the structure of carry circuit of adder unit has important influence on delay and resource utilization of *** connection mode of adder unit given in the article is acceptable and *** is an ideal device to implement sequential *** if we want to design more pocket sequential multiplier in FPGA, there are still many problems to discuss.

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MicroRNA-886-5p inhibits apoptosis by down-regulation of bax expression in human cervical carcinoma cells

MicroRNA-886-5p inhibits apoptosis by down-regulation of bax...

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中国生物化学与分子生物学会第十届会员代表大会暨全国学术会议

作者： jinghua li Yaonan Zhang Yuxiang Zhang Capital Medical University

MicroRNAs(miRNAs) play an essential role in the progression of a variety of cancers,but the role of miRNAs in cervical cancer is not well *** this study,miRNA expression profiles were investigated using cervical squamous cell carcinomas(CSCCs) and adjacent non-tumor *** expressed miRNAs were validated with real-time reverse transcription-polymerase chain reaction (RT-PCR).We found that seven miRNAs differentially

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A DECOMPOSITION METHOD OF STRUCTURAL DECOMPOSITION ANALYSIS

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Journal of Systems Science & Complexity 2005年第2期18卷 210-218页

作者： lijinghua SchoolofBusiness ChinaUniversityofPoliticalScienceandLawBeijing102249China

Over the past two decades, structural decomposition analysis (SDA) has developed into a major analytical tool in the field of input-output (IO) techniques, but the method was found to suffer from one or more of the following problems. The decomposition forms, which are used to measure the contribution of a specific determinant, are not unique due to the existence of a multitude of equivalent forms, irrational due to the weights of different determinants not matching, inexact due to the existence of large interaction *** this paper, a decomposition method is derived to overcome these deficiencies, and we prove that the result of this approach is equal to the Shapley value in cooperative games,and so some properties of the method are obtained. Beyond that, the two approaches that have been used predominantly in the literature have been proved to be the approximate solutions of the method.

关键词： economic structure structural decomposition analysis input-outputframework shapley value

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Optimal Trade-Off Between Regulation and Wind Curtailment in the Economic Dispatch Problem

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CSEE Journal of Power and Energy Systems 2015年第4期1卷 52-60页

作者： jinghua li Jiakun Fang Jinyu Wen Yi Pan Qiang Ding State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China the department of electrical engineering Guangxi UniversityNanning 530004China China Electric Power Research Institute Beijing 100192China

Generator regulation and wind power curtailment are two conflicting ways to deal with the inaccurate prediction and volatility of wind *** study focuses on planning the day-ahead schedule based on optimal trade-off between regulation of generators and wind *** to traditional economic dispatch methods,the proposed schedule is more robust and adaptive to multiple forecast scenarios instead of a single forecast *** works of this paper are as follows:First,an economic dispatch problem based on multiple scenarios is formulated with the objective of minimizing both generator regulation and wind ***,a forecast method for wind power scenarios is ***,the proposed model is verified by comparing with other dispatch models that are based on single forecast *** simulation results demonstrate the effectiveness of the proposed method with less wind curtailment,generator regulation,and operational *** addition,the penalty factors are set as parameters and the influences on the generators’regulation and wind curtailment are analyzed,providing the reference for system operators with different regulatory purposes.

关键词： Economic dispatch forecasting regulation uncertainty wind curtailment wind power scenarios

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高频超声及超声造影引导内镜治疗小儿粪石所致化脓性阑尾炎的临床价值

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临床超声医学杂志 2024年第7期26卷 564-568页

作者：郭晓亚杨恒丽李菁华杨一林曾令超王春晖杨瑞静空军军医大学第二附属医院超声科西安市710038 空军军医大学第二附属医院儿科西安市710038 西安医学院第二附属医院超声科

目的探讨高频超声及术中腔内超声造影引导内镜下逆行阑尾炎治疗术(ERAT)联合数字化胆道子镜(以下简称子镜)治疗小儿粪石所致化脓性阑尾炎的临床价值。方法回顾性分析行内镜治疗的48例粪石所致化脓性阑尾炎患儿的病历资料,所有患儿术前... 详细信息

目的探讨高频超声及术中腔内超声造影引导内镜下逆行阑尾炎治疗术(ERAT)联合数字化胆道子镜(以下简称子镜)治疗小儿粪石所致化脓性阑尾炎的临床价值。方法回顾性分析行内镜治疗的48例粪石所致化脓性阑尾炎患儿的病历资料,所有患儿术前均行高频超声检查测量阑尾外径、阑尾壁厚度、粪石直径,观察其周边网膜是否增厚,术中腔内超声造影观察并记录粪石是否成功取出、阑尾有无穿孔。根据术后治疗结果分为取石成功组39例和术中穿孔组9例,分析超声与子镜检查结果的诊断符合率;记录并发症发生情况。治疗后定期随访患儿,比较两组超声参数、实验室指标恢复正常时间和临床症状消失时间及疗效。结果48例患儿术中腔内超声造影显示粪石成功清除39例,阑尾穿孔9例;子镜显示粪石成功清除34例,阑尾破口5例,二者诊断符合率分别为87.17%、55.56%。术后取石成功组均未见明显并发症,术中穿孔组出现1例阑尾周围包裹性脓肿。治疗后两组阑尾壁厚度、网膜厚度、白细胞计数、C反应蛋白恢复正常参考值时间和腹痛、发热消失时间比较,差异均有统计学意义(均P<0.05)。取石成功组疗效为优、良、差者分别为35、4、0例,术中穿孔组疗效为优、良、差者分别为0、8、1例,两组治疗优良率比较(100%vs.88.89%),差异无统计学意义。结论高频超声及术中腔内超声造影引导ERAT联合子镜治疗小儿粪石所致化脓性阑尾炎具有实时、精准、治愈率高且并发症少的优势,有一定的临床价值。

关键词：超声检查造影剂化脓性阑尾炎粪石内镜治疗

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