检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

越南天然橡胶出口贸易的竞争力研究

越南天然橡胶出口贸易的竞争力研究

作者：张成光（TRUONG thanh quang）华中农业大学

学位级别：硕士

天然橡胶是越南的重要支柱产业。与其他地区国家相比,越南橡胶产业发展晚于其他国家,如泰国、印尼、马来西亚等。但其发展速度较快,目前,越南已经成为世界第四大天然橡胶生产国与出口国。从2000年到现在,越南天然橡胶出口量不断增加;然... 详细信息

天然橡胶是越南的重要支柱产业。与其他地区国家相比,越南橡胶产业发展晚于其他国家,如泰国、印尼、马来西亚等。但其发展速度较快,目前,越南已经成为世界第四大天然橡胶生产国与出口国。从2000年到现在,越南天然橡胶出口量不断增加;然而,由于天然橡胶的出口价格有较大的波动,所以其出口值也有一定的波动性。越南目前的天然橡胶出口贸易在国际市场上具有比较优势。本文以比较优势理论、竞争优势理论和产品出口竞争力理论为理论基础,利用市场占有率、显示性比较优势指数、相对贸易优势指数和出口增长率分析方法,对越南天然橡胶产业的出口竞争优势进行研究。同时,选取了泰国、印尼、马来西亚、越南和科特迪瓦5个国家,采用2005—2014年之间的数据,利用市场占有率、显示性比较优势指数、相对贸易优势指数和出口增长率,对比分析5个国家天然橡胶的国际竞争力。从统计过程结果中发现,5个国家的天然橡胶贸易在国际市场上具有比较优势,但每个国家天然橡胶的国际竞争力是不一样的。此外,印度尼西亚的天然橡胶出口潜力最高,泰国的天然橡胶出口潜力居第二位,第三是越南,第四是马来西亚,最后是科特迪瓦。最后根据越南天然橡胶产业的优势不足建立健全完善的预警系统,积极推进科学技术,在天然橡胶产业结构调整,增加天然橡胶产品出口值等方面提出相关建议。

关键词：越南天然橡胶产业出口贸易竞争优势

Effect of Freeze-Thaw and Urea in Solubility of GPC3-Csub Protein Expressed in Escherichia coli

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Journal of Biosciences and Medicines 2024年第4期12卷 288-297页

作者： Xuan-Truc Chu-Dao Kim-Tuyen Huynh-Dam Dang-Thuc Ngo-Luong quang-Luan Le thanh-Thao Vo-Nguyen Department of Medical Biotechnology Biotechnology Center of Ho Chi Minh City Ho Chi Minh City Vietnam

Glypican-3 is a protein encoded by the Glypican-3 gene located on human X chromosome (Xq26), composed of two subunits, a 40 kDa N-terminal subunit, and a 30 kDa C-terminal subunit. Glypican-3 is a currently potential target molecule for liver cancer treatments because of its over-expression and growth effects on hepatocellular carcinoma (HCC). This study examined the expression and purification of a C-terminal subunit of Glypican-3 protein (GPC3-Csub) due to its application in both diagnosis and therapy for hepatocellular carcinoma. The gene encoding for GPC3-Csub was successfully cloned into plasmid pET28a fused with an affinity tag composed of six consecutive histidine residues (His-tag). Recombinant protein GPC3-Csub was expressed in Escherichia coli BL21 (DE3) in the condition of adding 3% ethanol with IPTG induction. GPC3-Csub was extracted using repeated freeze-thaw cycles with lysozyme, and inclusion bodies were solubilized by 8M Urea, SDS 10% in pH 12. His-tag fused GPC3-Csub proteins allowed it to be purified by affinity chromatography method using the Nickel-nitrilotriacetic acid (Ni-NTA) column. High expression of GPC3-Csub was confirmed by Coomassie staining and western-blot. GPC3-Csub could be isolated with a Ni-NTA column and have a purity of about 90%.

关键词： Glypican-3 Affinity Chromatography Inclusion Body Liver Cancer

Damage detection in steel plates using feed-forward neural network coupled with hybrid particle swarm optimization and gravitational search algorithm

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 Zhejiang University-Science A(Applied Physics & Engineering) 2021年第6期22卷 467-480页

作者： Long Viet HO Duong Huong NGUYEN Guido de ROECK thanh BU-TIEN Magd Abdel WAHAB Soete Laboratory Department of Electrical EnergyMetalsMechanical Constructions and SystemsFaculty of Engineering and ArchitectureGhent UniversityGent 9000Belgium Department of Bridge and Tunnel Engineering Faculty of Civil EngineeringUniversity of Transport and CommunicationsHo Chi Minh 700000Vietnam Department of Bridge and Tunnel Engineering Faculty of Bridge and RoadNational University of Civil EngineeringHanoiVietnam Department of Civil Engineering Structural MechanicsKatholieke Universiteit LeuvenB-3001 LeuvenBelgium Department of Bridge and Tunnel Engineering Faculty of Civil EngineeringUniversity of Transport and CommunicationsHanoiVietnam Division of Computational Mechanics Ton Due Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Due Thang UniversityHo Chi Minh CityVietnam

Over recent decades,the artificial neural networks(ANNs)have been applied as an effective approach for detecting damage in construction ***,to achieve a superior result of defect identification,they have to overcome some shortcomings,for instance slow convergence or stagnancy in local ***,optimization algorithms with a global search ability are used to enhance ANNs,*** increase the rate of convergence and to reach a global *** paper introduces a two-stage approach for failure identification in a steel *** the first step,the presence of defects and their positions are identified by modal *** the second step,a feedforward neural network,improved by a hybrid particle swarm optimization and gravitational search algorithm,namely FNN-PSOGSA,is used to quantify the severity of *** element(FE)models of the beam for two damage scenarios are used to certify the accuracy and reliability of the proposed *** comparison,a traditional ANN is also used to estimate the severity of the *** obtained results prove that the proposed approach can be used effectively for damage detection and quantification.

关键词： Feedforward neural network-particle swarm optimization and gravitational search algorithm(FNN-PSOGSA) Modal damage indices Damage detection Hybrid algorithm PSOGSA

Influence of sintering behavior on the microstructure and electrical properties of BaTiO_(3) lead-free ceramics from hydrothermal synthesized precursor nanoparticles

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2021年第2期11卷 42-51页

作者： Do Viet On Le Dai Vuong Truong Van Chuong Dao Anh quang Ho Van Tuyen Vo thanh Tung Department of Physics College of Sciences Hue UniversityHue CityVietnam Faculty of Chemical and Environmental Engineering Hue Industrial College Hue CityVietnam Institute of Research and Development Duy Tan University Da Nang CityVietnam Faculty of Natural Sciences Duy Tan University Da Nang CityVietnam

BaTiO_(3) nanoparticles were synthesized by hydrothermal method using amorphous phase TiO_(2) precursor as the *** microstructure and phase structure were determined using XRD,SEM and Raman spectroscopy analysis *** results showed that BaTiO_(3) nanoparticles have tetragonal structure,average size of about 100 nm was obtained at Ba/Ti ratio of 1.5,synthesis temperature of 200℃ and reaction time of 12 *** components of the BaTiO_(3) lead-free ceramic system are fabricated by conventional solid-phase reaction from the average size BaTiO_(3) particles about 100 nm obtained by hydrothermal *** effects of sintering behavior on dielectric,ferroelectric and piezoelectric properties of BT high-density ceramic were *** BaTiO_(3) ceramic composition sintered at 1300℃ has a relative density of 97%,the value of the electromechanical coefficient kp=0.40,k33=0.42,the large piezoelectric coefficient d_(33)=300 pC/N,d_(31)=−125 pC/N.

关键词： BaTiO_(3)nanoparticles lead-free ceramics piezoelectric ferroelectric properties

Detection and localization of the hemoglobin and collagen distribution of the uterine cervix

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 Innovative Optical Health Sciences 2019年第4期12卷 116-126页

作者： Tran Van Tien Nguyen Ngoc Quynh Le Huynh Duc Phan Ngoc Khuong Cat Huynh quang Linh Department of Applied Physics Faculty of Applied Science Ho Chi Minh City University of Technology700000 Vietnam DCSELAB—National key Laboratory of Digital Control and System Engineering 700000 Vietnam Department of Biomedical Engineering Faculty of Medicine Nguyen Tat Thanh University700000 Vietnam Department of Engineering Physics Faculty of Applied Science Ho Chi Minh City University of Technology700000 Vietnam

Changes of the blood vessels and collagen are associated with the development of abnormal cervical ***,optical coberence tomography and Mueller polarization images were 1used to provide information regarding the presence of collagen fibers in the cervical ***,most of these methods need a lot of time for image recording and are *** addition,the general survey on the absorption and distribution characteristics of collagen and blood in the cervical is still *** this study,we developed a colposcopy combining cross-polarized inage and image procssing algorithm with an fficient analytical model to map the distribution of blood and collagen in the *** this system's proof of concept,we captured and processed the case of cervical ectopy and Nabothian *** results show that the distribution of blood and collagen maps matched with anatomical and physiological when compared with Lugol's iodline *** technology has some advantages,such as low cost,real time,and can replace the 11se of acetic acid or Lugol's iodine in the future.

关键词： Hemoglobin collagen cross polarized image uterine cervix

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

建立比较评估能源的能力——扩大动力基础

国际原子能机构通报 2000年第2期42卷 8-13页

作者： BRUCE HAMILTON GUENTER CONZELMANN DUY thanh bui IAEA核能司规划与经济研究科美国阿贡国家实验室国家与国际研究部

对国家能源系统的分析现已到了前所未有的复杂程度。除了未来能源需求、技术性能和成本存在着不确定性外。

关键词：比较评估能源需求电力系统规划能源链核动力能源系统能源规划可持续能源数据库发展中国家

内排-老街高速公路对越南老街省经济发展的影响

在线全文

学校读者我要写书评

暂无评论

哈尔滨商业大学学报（自然科学版） 2018年第5期34卷 630-634页

作者：宗刚 bui THI thanh 曾庆华北京工业大学经济管理学院北京100022

以内排-老街高速公路为例,根据系统性原则和实用性、定量与定性相结合原则,利用GM模型分析有无高速公路国内生产总值的变化,并结合统计数据研究在高速公路建设阶段和高速公路运营阶段分别对经济发展的影响.结果得出:内排-老街高速公路... 详细信息

以内排-老街高速公路为例,根据系统性原则和实用性、定量与定性相结合原则,利用GM模型分析有无高速公路国内生产总值的变化,并结合统计数据研究在高速公路建设阶段和高速公路运营阶段分别对经济发展的影响.结果得出:内排-老街高速公路对老街省经济发展的直接影响,促进国内生产总值增长,对老街省的国民经济贡献率为8. 3%,平均年旅游收入均增长3. 2倍,平均年运输收入均增加2. 5倍,年均进出口的产量增长2. 1倍.

关键词：高速公路区域经济发展影响

针灸与五羟色胺再摄取抑制剂(SSRI)类药物改善抑郁症患者生活质量的meta分析

在线全文

学校读者我要写书评

暂无评论

世界最新医学信息文摘 2017年第99期 120-124页

作者： NGUYEN BA quang NGHIEM HUU thanh NGO quang HAI 王珏莲越南针灸中央医院广州中医药大学

目的系统评价针灸与SSRI类药物改善抑郁症患者生活质量的有效性。方法检索中英文电子数据库,收集针灸治疗抑郁症的随机对照临床研究文献。对纳入的文献进行偏倚风险评估和质量评估,并对其生活质量情况改善进行META分析。结果在总生存质... 详细信息

目的系统评价针灸与SSRI类药物改善抑郁症患者生活质量的有效性。方法检索中英文电子数据库,收集针灸治疗抑郁症的随机对照临床研究文献。对纳入的文献进行偏倚风险评估和质量评估,并对其生活质量情况改善进行META分析。结果在总生存质量改善方面,电针组(WMD=0.46,95%CI(0.26,0.65),P<0.00001),手针组(WMD=0.34,95%CI(0.15,0.52),P=0.0003),两组均优于药物组;在总健康状况改善方面,电针组(WMD=0.38,95%CI(0.16,0.59),P=0.0007),手针组(WMD=0.44,95%CI(0.21,0.66),P=0.0001),两组均优于药物组;在生活质量量表改善方面,单独使用针灸疗效(WMD=0.15,95%CI(0.66,0.96),P=0.72)与药物使用相当,而针药联用治疗(WMD=0.69,95%CI(0.38,0.99),P<0.00001)优于药物治疗。结论针灸治疗可改善抑郁症患者的生活质量。

关键词：抑郁症针灸 SSRI药物随机对照试验系统评价 META分析

Determination of the Administration Routes,Doses and Appropriate Age to Vaccinate With Ornitin Triple Vaccine For Cross-breed Colored Broilers in Vietnam

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Veterinary Science Research 2019年第2期1卷 1-9页

作者： Nguyen Manh Ho bui Ngoc Xuan Ha Le Thi Kim Tuyen Le Thi Anh Thu Le thanh Hien Quach Tuyet Anh Faculty of Animal Science and Veterinary Medicine Nong Lam UniversityHo Chi Minh CityVietnam

The study was to determine the appropriate dose and administration route of Ornitin Triple vaccine in cross-breed coloured broilers in Vietnam by evaluating the antibody titer against Ornithobacterium rhinotracheale(ORT)and local reactions at injection sites on chickens after *** study was divided into 2 *** trials were designed with 3 vaccine dose groups:0.0ml(control group),0.25ml and 0.5ml and 2 different administration routes:subcutaneous at neck(SC)and intramuscular at breast(IM)*** result showed that,no statistically significant difference was found between antibody titer of two administration routes as well as 2 vaccine doses until *** reactions at the injection sites of IM route was less severe than SC at neck and in higher dose would produce a more severe swelling *** weight gain was found to have a slight decrease in the vaccinated groups within 2 weeks after vaccination,however,no statistically significant difference was found in later stage(P>0.05).In conclusion,Ornitin Triple can be used to vaccinate by IM with the dose of 0.25ml for coloured broilers at early age(3-week-old),or 0.5ml for older birds and should be careful for some reactions at the injection sites.

关键词： ORT disease swelling reaction titer IDEXX bacteria vaccine