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Thermodynamic Simulation on the Change in Phase for Carburizing Process

Computers, Materials & Continua 2021年第7期68卷 1129-1145页

作者： Anh Tuan Hoang Xuan Phuong Nguyen Osamah Ibrahim Khalaf Thi Xuan Tran minh quang chau Thi minh Hao Dong Duong Nam Nguyen Ho Chi minh city University of Technology(HUTECH) HoVietnam Ho Chi minh city University of Transport Ho Chi Minh cityVietnam Al-Nahrain University Al-Nahrain Nanorenewable Energy Research CenterBaghdadIraq Hanoi University of Science and Technology HanoiVietnam Industrial University of Ho Chi minh City(IUH) Ho Chi Minh cityVietnam Vietnam Maritime University HaiphongVietnam

The type of technology used to strengthen the surface structure of machine parts,typically by carbon-permeation,has made a great contribution to the mechanical engineering industry because of its outstanding advantages in corrosion resistance and enhanced mechanical and physical ***,carbon permeation is considered as an optimal method of heat treatment through the diffusion of carbon atoms into the surface of alloy *** study presented research results on the thermodynamic calculation and simulation of the carbon permeability *** Fick’s law,the paper calculated the distribution of carbon concentration in the alloy steel after it is absorbed from the surface into the internal of the *** the SYSWELD software,an analysis was performed on the carbon permeability process to determine the distribution of carbon concentrations in 20CrMo steel that was then followed by a detailed analysis of the microstructure of the sample post the carburizing *** to the calculation results,the surface carbon content was 0.9%and steadily decreased into the *** 3 hours,the depth of the absorbent layer was measured at 0.5 mm for both the cylindrical and cubic *** analyzing the phase,the distribution of martensite phases such as ferrite/pearlite and residual austenite was also determined after the carburizing process.

关键词： Carburizing process 20CrMo steel thermodynamic analysis microstructure formation carbon concentration

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Effect of Poly-Alkylene-Glycol Quenchant on the Distortion, Hardness, and Microstructure of 65Mn Steel

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Computers, Materials & Continua 2021年第6期67卷 3249-3264页

作者： Thi Xuan Tran Xuan Phuong Nguyen Duong Nam Nguyen Dinh Toai Vu minh quang chau Osamah Ibrahim Khalaf Anh Tuan Hoang Hanoi University of Science and Technology HanoiVietnam Ho Chi minh City University of Transport Ho Chi Minh CityVietnam Vietnam Maritime University HaiphongVietnam Industrial University of Ho Chi minh City(IUH) Ho Chi Minh CityVietnam Al-Nahrain Nanorenewable Energy Research Center Al-Nahrain UniversityBaghdadIraq Ho Chi minh city University of Technology(HUTECH) Ho Chi Minh CityVietnam

Currently,the 65Mn steel is quenched mainly by oil *** though the lower cooling rate of oil compared to water reduces the hardness of steel post quenching,the deforming and cracking of parts are often *** the other hand,the oil media also has the disadvantage of being ammable,creating smoke that adversely affects the *** poly alkylene glycol(PAG)polymer quenchant is commonly used for quenching a variety of steels based on its advantages such as non-ammability and exible cooling rate subjected to varying concentration and stirring *** article examines the effect of PAG polymer quenching solution(with concentrations of 10%and 20%)on deformation,hardness,and microstructure of C-ring samples made of 65Mn ***,the performance of PAG polymer quenchant is also compared with those of two common quenching solutions:Water and *** cooling in water,the C-ring samples had the largest deformation and 2 times higher than the results obtained when a 10%PAG solution was *** particular,similar levels of deformation on the C-ring samples were observed in both cases of 20%PAG solution and oil as the primary quenching ***,the hardness level measured between the sampled parts quenched in the 20%PAG solution appeared to be more uniform than that obtained from the oil-quenched *** study of the microscopic structure of steel by optical microscopy combined with X-ray diffraction showed that the water hardened sample exhibited cracks and comprised of two phases,martensite and retained *** to the results of Electron Back Scattering Diffraction(EBSD)analysis and backscattering electronic image(BSE),the content of austenite residue in the sample when the sample was cooled in PAG 10 and 20%solution was 3.21%and 4.73%,respectively and smaller than the measurements obtained from oil quenching ***,the 65Mn steel is cooled in 20%PAG solution for high hardness and more evenly distributed than when it is q

关键词： Polyethylene glycol electron backscattering diffraction quenching media cooling rate backscattering electronic image

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Combined transarterial chemoembolization and stereotactic body radiation therapy as a bridge therapy to liver transplant for hepatocellular carcinoma

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Hepatoma Research 2020年第8期6卷 36-45页

作者： Bui quang Bieu Nguyen Dinh chau Nguyen Xuan Kien Le Van Thanh Vu Van quang Thai Doan Ky Nguyen Tien Thinh Mai Hong Bang Department of Radiation Oncology and Radiosurgery Military Central Hospital 108Hanoi 100000Vietnam Department of Hepatobiliary and Pancreatic Surgery Military Central Hospital 108Hanoi 100000Vietnam Department of Gastroenterology and Hepatobiliary Military Central Hospital 108Hanoi 100000Vietnam.

Liver transplant(LT)is the curative treatment for patients with hepatocellular carcinoma(HCC).Bridge therapies are local treatments given to patients on the LT waitlist,to prevent tumor progression and to reduce the dropout *** presentation:We reported a 40-year-old man diagnosed with Barcenola-Clinic Liver Cancer BCLC intermediate stage HCC and Child-Pugh A5 hepatitis B virus cirrhosis who underwent combined bridge therapies to ***,the patient received transarterial chemoembolization(TACE)for two times and showed a partial *** he underwent stereotactic body radiation therapy(SBRT)with a total dose of 45 Gy in 3 *** months later,the tumor size and serum protein induced by Vitamin K absence or antagonists-II,alpha fetoprotein levels decreased *** June 2019 a suitable donor was found and his LT was successfully ***:We propose that a combination of TACE and SBRT was feasible as bridge therapy for HCC patients on the LT waitlist.

关键词： Transarterial chemoembolization stereotactic body radiation therapy bridge therapy hepatocellular carcinoma liver transplant

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Evaluating the yield of systematic screening for tuberculosis among three priority groups in Ho Chi minh City,Viet Nam

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Infectious Diseases of Poverty 2020年第6期9卷 16-28页

作者： Luan Nguyen quang Vo Andrew James Codlin Rachel Jeanette Forse NgaThuy Nguyen Thanh Nguyen Vu Giang Truong Le Vinh Van Truong Giang chau Do Ha minh Dang Lan Huu Nguyen Hoa Binh Nguyen Nhung Viet Nguyen Jens Levy Knut Lonnroth SBertel Squire Maxine Caws Friends for International TB Relief 68B Nguyen Van Troi8Phu NhuanHo Chi Minh CityViet Nam Interactive Research and Development Ho Chi Minh CityViet Nam Ho Chi minh City Public Health Association Ho Chi Minh CityViet Nam Pham Ngoc Thach Hospital Ho Chi Minh CityViet Nam National Lung Hospital Ha NoiViet Nam KNCV Tuberculosefonds The HagueThe Netherlands Department of Global Public Health Karolinska InstitutetStockholmSweden Department of Clinical Sciences Liverpool School of Tropical MedicineLiverpoolUK Birat Nepal Medical Trust LazimpatKathmanduNepal

Background: In order to end tuberculosis(TB),it is necessary to expand coverage of TB care services,including systematic screening ***,more evidence is needed for groups among whom systematic screening is only conditionally recommended by the World Health *** study evaluated concurrent screening in multiple target groups using community health workers(CHW).Methods:: In our two-year intervention study lasting from October 2017 to September 2019,CHWs in six districts of Ho Chi minh City,Viet Nam verbally screened three urban priority groups:(1)household TB contacts;(2)close TB contacts;and(3)residents of urban priority areas without clear documented exposure to TB including hotspots,boarding homes and urban *** persons were referred for further screening with chest radiography and follow-on testing with the Xpert MTB/RIF *** individuals with normal or without radiography results were tested on smear *** described the TB care cascade and characteristics for each priority group,and calculated yield and number needed to ***,we fitted a mixed-effect logistic regression to identify the association of these target groups and secondary patient covariates with TB treatment ***: We verbally screened 321020 people including 24232 household contacts,3182 social and close contacts and 293606 residents of urban priority *** resulted in 1138 persons treated for TB,of whom 85 were household contacts,39 were close contacts and 1014 belonged to urban priority area *** yield of active TB in these groups was 351,1226 and 345 per 100000,respectively,corresponding to numbers needed to screen of 285,82 and *** fitted model showed that close contacts[adjusted odds ratio(aOR)=2.07;95%CI:1.38–3.11;P<0.001]and urban priority area residents(aOR=2.18;95%CI:1.69–2.79;P<0.001)had a greater risk of active TB than household ***: The study detected a large number of un

关键词： Case detection Tuberculosis Active case finding Urban Viet nam

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越南基巧红宝石中的包裹体及其成因

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宝石和宝石学杂志 2004年第3期6卷 40-42页

作者： Pham Van Long Hoang quang Vinh Nguyen Xuan Nghia 闫晨 CentreforGemandGoldResearchandIdentification HanoiVietnam InstituteofGeologicalSciences NCNSTHanoiVietnam InstituteofMaterialsScience NCNSTHanoiVietnam 不详

展示了对越南基巧红宝石中包裹体的研究成果。用光学显微镜检测了这些包裹体的特征。采用拉曼散射法和扫描电子探针分析了包裹体的成分。在该类红宝石中发现了锐钛矿、红柱石、钙长石、磷灰石、黑云母、一水软铝石、板钛矿、方解石、刚... 详细信息

展示了对越南基巧红宝石中包裹体的研究成果。用光学显微镜检测了这些包裹体的特征。采用拉曼散射法和扫描电子探针分析了包裹体的成分。在该类红宝石中发现了锐钛矿、红柱石、钙长石、磷灰石、黑云母、一水软铝石、板钛矿、方解石、刚玉、硬水铝石、白云石、石墨、珍珠云母、白云母、金云母、黄铁矿、金红石、锆石、黝帘石包裹体组合。描述了该类红宝石多相包裹体中气-液相与负晶的成分,讨论了主晶红宝石的形成条件。

关键词：包裹体红宝石矿物组合成因越南

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