检索结果-南通市图书馆

Thermoelectric transport properties of Pb-Sn-Te-Se system

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2018年第4期37卷 343-350页

作者： Bing-Chao Qin Yu Xiao yi-ming zhou Li-Dong Zhao School of Materials Science and Engineering Beihang University Beijing 100191 China

IV-VI compounds are considered as promising thermoelectric materials, and high thermoelectric performance was achieved in IV-VI solid solutions. In this work, the thermoelectric properties of Pb-Sn-Te-Se-based solid solutions were systematically investigated. Among these solid solutions, it is found that a figure of merit （ZT） peak value of 1.0 at 873 K can be obtained in （PbTe）0.5（SnTe）o.5, on account of the combination of superior electrical properties in SnTe and low thermal conductivity in PbTe. Furthermore, we investigated and summarized the thermoelectric transport properties and proposed the thermoelectric performance maps for the IV- VI solid solutions in Pb-Sn-Te-Se system. This comprehensive investigation on Pb-Sn-Te-Se-based solid solutions can effectively guide and scan thermoelectric performance for a given unknown composition and enhance the thermoelectric properties in IV-VI compounds.

关键词： Thermoelectric materials Electricalconductivity Thermal conductivity Pb-Sn-Te-Se system Solid solutions

Shape Optimization of Pressure Vessel Head Based on the Super-ellipse Equation

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2013年第4期20卷 52-62页

作者： yi-ming zhou Bo Wang Geng-Dong Cheng State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology

This paper studies optimal shape design of pressure vessel head subject to internal uniform *** optimization aims at minimizing its maximum stress while the volume of the vessel head remains no less than the standard ellipsoidal ***-ellipse curve is selected to describe the middle surface shape of the vessel head because it represents a large family of curves with only two or three parameters and makes the design and manufacture *** performance of different elements and element sizes of FEM modeling is carefully studied in view of computational cost,accuracy and noises of von Mises *** response surface of the maximum stress *** design parameters is approximated by a Kriging surrogate model with EI criterion for sampling adding,based on the parameter optimization which is carried out to search the optimal ***,it is shown by numerical comparison that the super-ellipsoidal head is better than the standard ellipsoidal head and the other vessel heads in the literature.

关键词： shape optimization super-ellipse function Kriging pressure vessel head sampling criterion

Temperature dependence in tensile properties and deformation behavior of GH4169 alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2023年第12期30卷 2566-2581页

作者： Qi Zheng Tian Liu Jia-bo Wei Rui Luo yi-ming zhou Heng-nan Ding Le-li Chen Di Zhang Xiao-nong Cheng School of Materials Science and Engineering Jiangsu UniversityZhenjiang212013JiangsuChina Yangtze Delta Region Institute of Advanced Materials Suzhou215100JiangsuChina State Key Laboratory of Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China

The effect of temperature on the tensile properties and deformation mechanism of GH4169 alloy has been systematically studied over a wide range of room temperature(RT)to 1000℃.The results indicate that the stress–strain curve of the alloy shows serrations at 200–600℃,and the character of the serrations changes from type A to type B and then to type C at different *** ultimate tensile strength of the alloy decreases gradually from RT to 600℃.The yield strength decreases slowly from RT to 700℃ but decreases rapidly above 800℃.Transmission electron microscopy analysis relieves that the primary deformation mechanism of the alloy below 500℃ is Orowan bypass *** temperatures between 600 and 700℃,the coordinated deformation of twins and cross-slip of dislocations are *** transformation of\upgamma^{\prime\prime}phase toδphase above 650℃ will decrease the *** primary deformation mechanism above 800℃ transforms into the repeated shearing of\upgamma^{\prime\prime}by dislocations to form multiple stacking *** grains were observed above 800℃,and continuous dynamic recrystallization and discontinuous dynamic recrystallization were *** stress concentration caused by Nb-rich carbides is the cause of intracrystalline crack *** 700℃,grain boundary crack sprouting is caused by the combined effect of slip band impact on grain boundaries and grain boundary dislocation *** relationship between the serrated flow behavior and the deformation mechanism has been discussed based on the experimental results.

关键词： GH4169 alloy Tensile property Deformation mechanism Serrated flow

Radiofrequency ablation of hepatocellular carcinoma sized> 3 and ≤ 5 cm: Is ablative margin of more than 1 cm justified?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第42期19卷 7389-7398页

作者： Shan Ke Xue-Mei Ding Xiao-Jun Qian yi-ming zhou Bao-Xin Cao Kun Gao Wen-Bing Sun Department of Hepatobiliary Surgery Chao-yang Hospital Affiliated to Capital Medical University Department of Radiology Chaoyang Hospital Affiliated to Capital Medical UniversityBeijing 100043China Department of Interventional Medicine Chao-yang Hospital Affiliated to Capital Medical University

AIM:To investigate whether an ablative margin(AM)>1.0 cm might reduce chance of recurrence for patients with hepatocellular carcinoma(HCC)tumors 3.1to 5.0 cm in size,compared with an AM of 0.5-1.0 ***:From October 2005 to December 2012,936 consecutive patients with HCC who received radiofrequency ablation were *** these,281 patients,each with a single primary HCC tumor of 3.1 to5.0 cm in size on its greatest diameter,were included in the *** on the AM width,we categorized patients into the 0.5-1.0 cm group and the>1.0 cm *** tumor progression(LTP)-free survival,intrahepatic distant recurrence(IDR)-free survival and overall survival(OS)rates were obtained using the Kaplan-Meier ***:The 1-,2-,3-,4-,and 5-year LTP-free survival rates and IDR-free survival rates were significantly higher in the>1.0 cm group compared with the 0.5-1.0cm group(97.5%,86.3%,73.6%,49.5%and 26.4%vs 91.3%,78.4%,49.5%,27.8%,and 12.8%;95.1%,90.3%,77.0%,61.0%and 48.3%vs 95.2%,85.9%,62.6%,47.2%and 28.5%;P1.0 cm group(P=0.010).There were no significant differences in complication rates between the two *** univariate and multivariate analyses identified AM as an independent prognostic factor linked to LTP,IDR,and ***:For HCC tumors>3.0 cm and≤5.0cm,AM>1.0 cm could reduce chances of recurrence compared with AM of 0.5-1.0 cm,emphasizing the need for a more defensive strategy using AMs>1.0 cm for ablating HCC tumors of 3.1 to 5.0 cm.

关键词： Hepatocellular carcinoma Radiofrequency ablation Ablative margin Recurrence Survival

Where is the optimal plane to mobilize the anterior rectal wall in female patients undergoing total mesorectal excision?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2023年第19期29卷 2992-3002页

作者： Wei Jin Jun Yang Xin-Yu Li Wei-Cheng Wang Wen-Jian Meng You Li yi-Chao Liang yi-ming zhou Xin-Dong Yang Yang-Yang Li Shao-Tang Li Department of Colorectal and Anal Surgery The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina Department of Gastrointestinal Surgery The First Hospital of Quanzhou Affiliated to Fujian Medical UniversityQuanzhou 362002Fujian ProvinceChina Department of Gastrointestinal Surgery West China Hospital.Sichuan UniversityChengdu 610041Sichuan ProvinceChina Department of General Surgery Shanghai Jiao Tong University Medical School Affiliated RuijinShanghai 201800China Department of General Surgery Shengjing Hospital of China Medical UniversityShenyang 111300Liaoning ProvinceChina Department of General Surgery Huashan Hospital Fudan UniversityShanghai 201800China School of Basic Medicine Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina Department of Pathology the First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina National Key Clinical Specialty(General Surgery) The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina

BACKGROUND Since Heald proposed the total mesorectal excision(TME)procedure,the prognosis of patients with rectal cancer has been significantly *** Heald did not specifically describe the anterior surgical plane in female *** the surgical plane for mobilizing the anterior rectal wall during TME surgery in female patients remains *** To investigate the anatomy of the female pelvis and identify the optimal plane for mobilizing the anterior rectal *** We retrospectively collected surgical procedure videos and clinical data of female patients diagnosed with middle or low rectal cancer who underwent the TME procedure between January 2020 and October 2022 across six *** patients were divided into two groups based on the surgical approach used to mobilize the anterior rectal wall:The experimental group was to open the peritoneum at the lowest point of the peritonea reflection and enter the plane for mobilizing,while the control group was cut at 0.5-1 cm above the peritoneal reflection and enter another ***,we compared the preoperative and postoperative information between the two *** also dissected and observed ten adult female pelvises to analyze the anatomic structure and compare the entry plane between the two ***,we researched the pathological structure between the rectum and the *** Finally,77 cases that met the criteria were included in our *** observations revealed that the experimental group underwent a smooth procedure,entering the plane amidst the mesorectal fascia and adventitia of the vagina,whereas the control group entered the plane between the vaginal adventitia and muscle *** to the control group,the experimental group showed a significant decrease in intraoperative bleeding[22.5(19.5-50)mL vs 17(5-20)mL,P=0.01],as well as a shorter duration of hospitalization[9(7-11.25)d vs 7(6-10)d,P=0.03].Through the examination of surgical videos and cadaveric stud

关键词： Rectal cancer Procedure Female Rectal surgery specialty Fascia Laparoscopic

Anisodamine accelerates spontaneous passage of single symptomatic bile duct stones ≤ 10 mm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第39期19卷 6618-6624页

作者： Jun Gao Xue-Mei Ding Shan Ke yi-ming zhou Xiao-Jun Qian Rui-Liang Ma Chun-Min Ning Zong-Hai Xin Wen-Bing Sun Department of Hepatobiliary Surgery Beijing Chaoyang Hospital Affiliated to Capital Medical University Department of Radiology Beijing Chaoyang Hospital Affiliated to Capital Medical University Department of General Surgery 254 Hospital of PLA Department of General Surgery Chaoyang Central Hospital Department of General Surgery Zhanhua People’s Hospital

AIM:To investigate the rate of spontaneous passage of single and symptomatic common bile duct(CBD)stones≤10 mm in diameter in 4 wk with or without a2-wk course of ***:A multicenter,randomized,placebocontrolled trial was undertaken.A total of 197 patients who met the inclusion criteria were *** patients were assigned randomly to the control group and the other 100 to the anisodamine *** anisodamine group received intravenous infusions of anisodamine(10 mg every 8 h)for 2 *** control group received the same volume of 0.9%isotonic saline for 2 *** underwent imaging studies and liver-function tests every week for 4 *** rate of spontaneous passage of CBD stones was ***:The rate of spontaneous passage of CBD stones was significantly higher in the anisodamine group than that in the control group(47.0%vs 22.7%).Most(87.2%,41/47)stone passages in the anisodamine group occurred in the first 2 wk,and passages in the control group occurred at a comparable rate each *** significantly increasing the possibility of spontaneous passage by univariate logistic regression analyses were stone diameter(<5 mm vs≥5 mm and≤10 mm)and anisodamine *** logistic regression analyses revealed that these two factors were significantly associated with spontaneous ***:Two weeks of anisodamine administration can safely accelerate spontaneous passage of single and symptomatic CBD stones≤10 mm in diameter,especially for stones<5 mm.

关键词： Common bile duct stones Anisodamine Spontaneous passage Success rate Randomized controlled trial

Nicotinamide overload may play a role in the development of type 2 diabetes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2009年第45期15卷 5674-5684页

作者： Shi-Sheng zhou Da Li Wu-Ping Sun ming Guo Yong-Zhi Lun yi-ming zhou Fu-Cheng Xiao Li-Xin Jing Shen-Xia Sun Li-Bin Zhang Ning Luo Fu-Ning Bian Wei Zou Lai-Bin Dong Zhi-Gang Zhao Sheng-Fan Li Xiao-Jie Gong Zeng-Guo Yu Chang-Bin Sun Cong-Long Zheng Dong-Ju Jiang Zheng-Ning Li Institute of Basic Medical Sciences Medical College Dalian University Dalian 116622 Liaoning Province China College of Environmental and Chemical Engineering -Dalian University Dalian 116622 Liaoning Province China Okazaki Institute for Integrative Bioscience National Institutes of Natural Sciences Okazaki 444-8787 Japan Department of Physiology Xinxiang Medical College Xinxiang 453003 Henan Province China Department of Life Sciences Liaoning Normal University Dalian 116029 Liaoning Province China - Department of Neurology PLA No. 91 HospitalJiaozuo 454003 Henan Province China Department of Medicine PLA No. 210 Hospital Dalian 116021 Liaoning Province China

AIM： To investigate whether nicotinamide overload plays a role in type 2 diabetes. METHODS： Nicotinamide metabolic patterns of 14 diabetic and 14 non-diabetic subjects were compared using HPLC. Cumulative effects of nicotinamide and N^1-methylnicotinamide on glucose metabolism, plasma HzO2 levels and tissue nicotinamide adenine dinucleotide （NAD） contents of adult Sprague-Dawley rats were observed. The role of human sweat glands and rat skin in nicotinamide metabolism was investigated using sauna and burn injury, respectively. RESULTS： Diabetic subjects had significantly higher plasma N^1-methylnicotinamide levels 5 h after a 100-mg nicotinamide load than the non-diabetic subjects （0.89 ± 0.13 μmol/L vs 0.6 ± 0.13 μmol/L, P 〈 0.001）. Cumulative doses of nicotinamide （2 g/kg） significantly increased rat plasma Nl-methylnicotinamide concentrations associated with severe insulin resistance, which was mimicked by Nl-methy-Inicotinamide. Moreover, cumulative exposure to N^1- methylnicotinamide （2 g/kg） markedly reduced rat muscle and liver NAD contents and erythrocyte NAD/ NADH ratio, and increased plasma H2O2 levels. Decrease in NAD/NADH ratio and increase in H2O2 generation were also observed in human erythrocytes after exposure to N^1-methylnicotinamide in vitro. Sweating eliminated excessive nicotinamide （5.3-fold increase in sweat nicotinamide concentration 1 h after a 100-mg nicotinamide load）. Skin damage or aldehyde oxidase inhibition with tamoxifen or olanzapine, both being notorious for impairing glucose tolerance, delayed N^1- methylnicotinamide clearance. CONCLUSION： These findings suggest that nicotinamide overload, which induced an increase in plasma N^1- methylnicotinamide, associated with oxidative stress and insulin resistance, plays a role in type 2 diabetes.

关键词： Type 2 diabetes Nicotinamide N^1-methyl-nicotinamide Insulin resistance Oxidative stress Liver Sweat glands

Silylated and acetylated β-cyclodextrins for gas chromatographic stationary phases

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Central South University of Technology 2001年第4期8卷 239-243页

作者： TANG Ke wen 1,2 ,yi Jian ming 2,zhou Chun shan 1,ZHONG Shi an 1 (1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China 2. College of Chemistry and Chemical Engineering, Yueyang Normal University College of Chemistry and Chemical Engineering Central South University Changsha China College of Chemistry and Chemical Engineering Yueyang Normal University Yueyang China

Two new chiral stationary phases, 2,3 di O acetyl 6 O trimethylsilyl β cyclodextrin (DATBCD) and 2,6 di O trimethylsilyl 3 O acetyl β cyclodextrin(DTABCD), were synthesized, their structures were identified by means of infrared and NMR spectra. Capillary columns were coated with the two stationary phases by dynamic method. The chromatographic properties, and enantiomers separation, such as ketone, esters, alcohols and olefines, were investigated on the silylated and acetylated β cyclodextrin stationary phases. The experimental results show that the silylated and acetylated β cyclodextrins are suitable to be used as capillary gas chromatographic stationary phases, the relative polarity of DATBCD and DTABCD stationary phases is respectively 4143 and 3928, the column efficiencies are respectively 3084 and 4198, and DATBCD is of stronger enantioselectivity than DTABCD, capacity factor of the first eluted enantiomer ( k 1) and separation factor(α)of α phenylethanol on DATBCD stationary phase are respectively 8.23 and 1.019.

关键词： capillary gas chromatography silylated and acetylated β-cyclodextrins enantiomeric separation

基于手机传感器的握持方式判断及运动状态识别

在线全文

学校读者我要写书评

暂无评论

电子科技大学学报 2017年第2期46卷 399-406页

作者：黄一鸣雷航周瑞桑楠电子科技大学信息与软件工程学院成都610054

传统运动识别技术多以传感器位置固定为前提进行识别,但当传感器放置位置或握持方式发生变化时运动识别率会受到相应影响。该文提出了一种基于手机传感器的握持方式判断及运动状态识别方法,解决了传感器随放置位置不同影响运动识别率的... 详细信息

传统运动识别技术多以传感器位置固定为前提进行识别,但当传感器放置位置或握持方式发生变化时运动识别率会受到相应影响。该文提出了一种基于手机传感器的握持方式判断及运动状态识别方法,解决了传感器随放置位置不同影响运动识别率的缺点。该方法首先通过传感器对设备握持方式进行判断,使用不同握持方式下的三轴加速度数据进行特征提取,通过多层小波变换得到各层高频和低频部分,对其进行组合形成初级特征,用奇异值分解对初级特征进行降维得到最终特征,使用基于径向基核函数的多分类支持向量机(SVM)对特征分类,进而判断不同握持方式下的不同运动。实验结果表明,该方法对不同运动方式下的平均识别率为93%。

关键词：运动识别奇异值分解支持向量机小波变换