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Effect of multiple heat treatments on fracture property of centrifugal casting stainless steels Z3CN20.09M with long-term thermal aging degradation

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Journal of Iron and Steel Research International 2021年第2期28卷 223-231页

作者： Min-yu Fan Wen-qing Jia Wei-wei yu Dong-ying Wang Meng guan yu Cao Fei Xue Yin-li Liu Jing-wen yao Bin Lin Ting yu Suzhou Nuclear Power Research Institute Suzhou 215004JiangsuChina Shenyang Blower Works Group Nuclear Pump Co. Ltd.Shenyang 110869LiaoningChina

It is of great significance to investigate effect of multiple heat treatments on fracture property of centrifugal casting stainless steels Z3CN20.09M cut from pump casing with long-term thermal aging degradation for nuclear power plants to consider actual operation of nuclear power *** multiple heat treatments and accelerated thermal aging experiment at the same temperature of 400℃ for different time were successively carried out on centrifugal casting stainless steels Z3CN20.09M in order to examine the metallographic modification and impact ***,an additional investigation on the related fracture properties was carried out,in which the critical initial fracture toughness Ji was determined by stretch zone width and 0.2 mm offset line *** results indicated that the multiple heat treatments led to the dispersed distribution of ferrite phases in austenite matrix and thus microhardness increased,but impact energy exhibited a decreasing tendency *** long-term aging,the metallographic structure remained almost unchanged,but the size of ferrite phases showed a slight increasing trend because of spinodal decomposition in ferrite phases and G-phase *** addition,centrifugal casting stainless steels Z3CN20.09M with multiple heat treatments exhibited the higher microhardness,Charpy impact toughness,critical initial fracture toughness J_(IC)(J-integral determined by 0.2 mm offset line method),and J_(SZW)(J-integral determined by stretch zone width method)than those with primary heat treatment,while the specific number of the heat treatment had a low influence on fracture toughness.

关键词： Multiple heat treatment Z3CN20.09M cast stainless steel Impact property Fracture toughness Long-term thermal aging

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Dynamic Couplingand Cooperative Control for Multi-paralleled Doubly Fed Induction Generator Wind Farms during Symmetrical Low Voltage Ride-through in a Weak Grid

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Protection and Control of Modern Power Systems 2024年第3期9卷 112-125页

作者： Lei guan Jun yao the College of Electrical Engineering at Chongqing University ChongqingChina the State Key Laboratory of Power Transmission Equipment Technology School of Electrical EngineeringChongqing UniversityChongqing 400044China

In multi-fed grid-connected systems,there are complex dynamic interactions between different pieces of *** in situations of weak-grid faults,the dynamic coupling between equipment becomes more *** may cause the system to experience small-signal instability during the fault *** this paper,multi-paralleled doubly fed induction generator(DFIG)-based wind farms(WFs)are taken as an example to study the dynamic coupling within a multi-fed system during fault steady-state of symmetrical low voltage ride-through(LVRT)in a weak *** analysis reveals that the dynamic coupling between WFs will introduce a damping shift to each *** inevitably affects the system’s dynamic stability and brings the risk of small-signal instability during fault steady-state in LVRT *** the distance to fault location and fault severity will exacerbate the dynamic coupling between *** of the dynamic coupling,adjusting the control state of one WF will affect the stability of the remaining WFs in the ***,a cooperative control strategy for multi-paralleled DFIG WFs is proposed to improve dynamic stability during *** analysis and the effectiveness of the proposed control strategy are verified by modal analysis and simu-lation.

关键词： Doubly fed induction generator(DFIG) wind farms(WFs) dynamic stability low voltage ride through(LVRT) weak grid dynamic coupling

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Human leukocyte antigen class II DQB1*0301, DRB1*1101 alleles and spontaneous clearance of hepatitis C virus infection: A meta-analysis

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World Journal of Gastroenterology 2005年第46期11卷 7302-7307页

作者： Xin Hong Rong-Bin yu Nan-Xiong Sun Bin Wang yao-Chu Xu guan-Ling Wu Department of Epidemiology and Biostatistics School of Public Health Nanjing Medical University Nanjing 210029 Jiangsu Province China Research Laboraiory for infectious Diseases The First Affiliated Hospital Nanjing Medical University Nanjing 210029 Jiangsu Province China Department of Pharmacology Nanjing Medical University Nanjing 210029 Jiangsu Province China Department of-Microbiology Nanjing Medical University Nanjing 210029 Jiangsu Province China

AIM： To assess the associations of human leukocyte antigen （HI_A） class Ⅱ DQB1＊0301 and/or DRB1＊1101 allele with spontaneous hepatitis C virus （HCV） clearance by meta-analysis of individual dataset from all studies published till date. METHODS： To clarify the impact of HLA class Ⅱ polymorphisms on viral clearance, we performed a metaanalysis of the published data from 11 studies comparing the frequencies of DQB1＊0301 and DRB1＊1101 alleles in individuals with spontaneous resolution to those with persistent infection. As we identified the heterogeneity between studies, summary statistical data were calculated based on a random-effect model. RESULTS： Meta-analyses yielded summary estimatesodds ratio （OR） of 2.36 [95%CI （1.62, 3.43）, P〈0.00001] and 2.02 [95%CI （1.56, 2.62）, P〈0.00001] for the effects of DQB1＊0301 and DRB1＊1101 alleles on spontaneous clearance of HCV, respectively. CONCLUSION： These results support the hypothesis that specific HLA class Ⅱ alleles might influence the susceptibility or resistance to persistent HCV infection. Both DQB1＊0301 and DRB1＊1101 are protective alleles and present HCV epitopes more effectively to CD4^＋T lymphocytes than others, and subjects with these two alleles are at a lower risk of developing chronic HCV infection. Large, multi-ethnic confirmatory and welldesigned studies are needed to determine the host genetic determinants of HCV infection.

关键词： Human leukocyte antigen Genetic polymorphism DQB1*0301 DRB1*1101 Hepatitis C virus Spontaneous clearance Meta-analysis

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Hydrophilic interaction liquid chromatography with indirect ultraviolet detection for the separation and quantification of pyrrolidinium ionic liquid cations

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Chinese Chemical Letters 2015年第11期26卷 1371-1375页

作者： Chao guan Hong yu College of Chemistry and Chemical Engineering Harbin Normal University

A method of hydrophilic interaction liquid chromatography with indirect ultraviolet detection was developed to determine three pyrrolidinium ionic liquid cations, i.e. N-methyl-N-ethyl pyrrolidinium cation （[MEPy]＋）, N-methyl-N-propyl pyrrolidinium cation （[MPPy]＋） and N-methyl-N-butyl pyrrolidi- nium cation （[MBPy]＋）. Chromatographic separation was achieved on a hydrophilic column using imidazolium ionic liquids and organic solvents as the mobile phase. The effects of the background ultraviolet absorption reagents, the imidazolium ionic liquids, detection wavelength, organic solvents, column temperature and the pH value of the mobile phase on the separation and determination of pyrrolidinium cations were investigated and the retention behaviors in hydrophilic interaction chromatography were discussed. The optimized chromatographic conditions were selected. Under the optimal conditions, the detection limits （SIN = 3） for [MEPy]＋, [MPPy]＋ and [MBPy]＋ were 0.59, 0.53 and 0.46 mg/L, respectively. The method has been successfully applied to the determination of the three ionic liquids synthesized in our chemistry laboratory. This research results may improve the analytical method of ionic liauid cations.

关键词： Hydrophilic interaction liquidchromatographyIndirect ultraviolet detectionPyrrolidinium cationsIonic liquids

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Injury to the axillary artery and brachial plexus caused by a closed floating shoulder injury: A case report

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World Journal of Clinical Cases 2018年第15期6卷 1029-1035页

作者： yu-Chun Chen Zhen Lian Yan-Na Lin Xin-Jia Wang guan-Feng yao Department of Orthopedics the Second Affiliated Hospital Shantou University Medical College Department of Rehabilitation Shantou Central Hospital

BACKGROUND A floating shoulder may be associated with catastrophic neurovascular injury and requires a multidisciplinary approach for its management. To maximize the like-lihood of good patient outcomes, this unique injury pattern should be recognized in patients as early as possible. This can be difficult to achieve, however, as there are currently few reports of floating shoulder in the literature, meaning that associated neurovascular injuries may be *** SUMMARY We present here a rare case of floating shoulder with axillary artery injury in a 34 -year-old woman. The patient complained of pain and numbness of her left upper limb after losing control of her motorcycle on a highway and falling from the vehicle 2 h ago. No blood pressure reading could be obtained from her left upper limb and no blood oxygen readings could be obtained from any of her left fingers. Computed tomography angiography and duplex ultrasonography revealed interruption of blood flow through the axillary artery, with distal flow being maintained through collateral arteries. The clinical diagnosis including fracture of the left proximal humerus, the left clavicle, and the left scapula, left axillary artery rupture, and left brachial plexus injury. We successfully performed open reduction and internal fixation of the fracture and vascular repair. The patient showed satisfactory recovery that was observed during 4 -mo *** Emergency surgery can be an effective therapeutic option for the closed floating shoulder with catastrophic axillary artery injury.

关键词： Floating shoulder injury Axillary artery injury Brachial plexus injury Complications of floating shoulder Management of floating shoulder Clavicle fracture Case report

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Testis and epididymis–unusual sites of metastatic gastric cancer: A case report and review of the literature

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World Journal of Clinical Cases 2022年第32期10卷 11974-11979页

作者： Jun-Jie Ji Feng-Ju guan yu yao Li-Jiang Sun Gui-Ming Zhang Department of Urology The Affiliated Hospital of Qingdao UniversityQingdao 266003Shandong ProvinceChina

BACKGROUND Although gastric cancer is one of the most prevalent cancers worldwide,cases of gastric cancer metastasis to the male reproductive system are ***,we report a case involving testicular and epididymal gastric cancer *** SUMMARY A 75-year-old Chinese man complained of experiencing a palpable painful mass in the right scrotum for 6 *** had undergone distal gastrectomy with chemotherapy for pT3N3aMx poorly differentiated gastric adenocarcinoma 9 mo *** examination revealed a moderate right hydrocele and a painful mass in the right testis and *** tumor biomarkers were all normal except for elevated beta-human chorionic gonadotropin *** tomography urography and B-ultrasound imaging revealed a moderate right hydrocele and a mixed solid-cystic mass in the right testicular and epididymal ***,the patient underwent right radical *** analysis revealed that the tumor cells were positive for pancytokeratins and caudal related homeodomain transcription ***,poorly differentiated gastric adenocarcinoma of the testis and epididymis was confirmed by *** continued to undergo chemotherapy at the department of oncology of our *** lymph node metastases were found at the postoperative 1-mo *** Palpable,painful scrotal mass,history of gastric cancer,and imaging features may indicate testicular and epididymal metastatic gastric cancer.

关键词： Gastric cancer Testis Epididymis Immunohistochemistry Metastasis Case report

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Developmental and Reproductive Toxicity of Soybean Isoflavones to Immature SD Rats

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Biomedical and Environmental Sciences 2008年第3期21卷 197-204页

作者： LEI guan yu HUANG ZHEN-yu CHEN Food and Nutritional Sciences Programme Department of Biochemistry Department of Physiology The Chinese University of Hong Kong Shatin N. T. Hong Kong China

Objective To investigate the dose-dependent toxic effect of soybean isoflavone extracts （SIE） on reproductive development in immature rats. Methods Growing male and female rats （n=50 each, 4 weeks） were divided into five groups fed with a standard cereal-based diet and gastrogavaged daily with 0, 30, 150, 300, and 600 mg SIE / kg body weight, respectively, for 12 weeks. Body weight, organ weights, and serum level of estrogen and testosterone were measured. Results Oral administration of SIE had no effect on food intake but decreased food efficiency ratio （P〈0.01）. Suppression on body weight gain by SIE was dose-dependent and the effect was greater on male than on female rats （P〈0.01）. SIE at high doses exhibited hepatotoxicity by increasing a relative liver weight, and also caused a smaller uterus but a greater relative ovary in female rats, while leading to larger relative testis and epididymis in male rats. SIE could decrease progesterone concentrations in female rats, whereas in male rats it reduced not only total testosterone level but also sperm count compared with the control group （P〈0.05）. Conclusion SIE at a range of 50-1000 times of human intake level affects not only growth but also development of reproductive system in growing rats.

关键词： Isoflavones Rat Reproduction Soybean Toxicity

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Optimal constant in an L^2 extension problem and a proof of a conjecture of Ohsawa

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Science China Mathematics 2015年第1期58卷 35-59页

作者： guan Qi'An ZHOU Xiang yu Beijing International Center for Mathematical Research Peking University School of Mathematical Sciences Peking University Institute of Mathematics Academy of Mathematics and Systems ScienceChinese Academy of Sciences Hua Loo-Keng Key Laboratory of Mathematics Chinese Academy of Sciences

In this paper,we solve the optimal constant problem in the setting of Ohsawa’s generalized L2extension *** applications,we prove a conjecture of Ohsawa and the extended Suita conjecture,we also establish some relatio... 详细信息

关键词： L2 extension theorem optimal L2 estimate Bergman kernel a conjecture of Ohsawa extendedSuita conjecture

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Predicting bruise susceptibility in apples using Vis/SWNIR technique combined with ensemble learning

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International Journal of Agricultural and Biological Engineering 2017年第5期10卷 144-153页

作者： yao Jian guan Jiyu Zhu Qibing Key Laboratory of Advanced Process Control for Light Industry(Ministry of Education) Jiangnan UniversityWuxi 214122China

Bruise susceptibility in fruits is an important indicator in evaluating risk factors for bruising caused by external *** of the bruising susceptibility of fruit can provide useful information for proper postharvest handling and storage *** this study,visible and shortwave near-infrared(Vis/SWNIR)technique was used to develop nondestructive method for predicting the bruise susceptibility of ***/SWNIR spectra covering 400-1100 nm were collected for 300‘Golden Delicious’apples over a time period of three weeks after harvest.A pendulum-like device was used to simulate impact bruise at three impact energy levels of 1.11 J,0.66 J and 0.33 *** volumes were estimated from the digital images of the bruised apples by using the bruise thickness *** prediction models,*** least squares model(PLS),partial least squares model combined with successful projection algorithm(SPA-PLS),and selective ensemble learning based on feature selection(SELFS),for bruise susceptibility were developed for each impact energy level as well as for the pooled *** with PLS and SPA-PLS model,SELFS gave the better prediction results for bruise susceptibility,with the correlation coefficient of R_(p)=0.800-0.886 for the prediction set,the root-mean-square error of 38.7-62.1 mm^(3)/J for the prediction set(RMSEP),and the residual predictive deviation(RPD)of 1.78-2.14 for three impact energy *** three impact energy levels,the RMSEP and RPD value obtained by SELFS model improved by 14.8%-20.0%and 15.0%-24.5%compared to PLS model,and 11.4%-21.2%and 11.5%-27.1%compared to SPA-PLS model,*** SELFS model achieved relatively lower prediction accuracies for the pooled data,with the R_(p) values of 0.731,RMSEP of 85.46 mm^(3)/J,and RPD of 1.46,which were also better than that of PLS model and SPA-PLS *** research demonstrated that Vis/SWNIR technique combined with ensemble learning is promising technique for rapid assessment of

关键词： apple nondestructive detection bruise susceptibility visible/short-wave near-infrared technique ensemble learning

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Second-order Moving-Baseline Localization for Mobile Wireless Sensor Networks 36

Second-order Moving-Baseline Localization for Mobile Wireles...

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第36届中国控制会议

作者： Fenxi yao yu Zhang Zixiao guan Baihai Zhang Shi Zhang School of Automation Beijing Institute of Technology

ISBN: (纸本)9781538629185

The location of node is a research focus in wireless sensor networks（WSNs）,and it is the foundation of the service based on the node *** this paper,we propose a new localization method to improve the moving-baseline localization（MBL） performance by using second-order *** method takes advantage of precise properties of *** improve the localization accuracy by accurate fitting movements *** results show that the time consumption is slightly increased,but the localization accuracy is improved *** update frequency of the proposed method is greatly reduced than MBL,by using second-order system.

关键词： Moving-Baseline Localization(MBL) Mobile Wireless Sensor Networks(MWSNs) Second-order moving system

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