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Design and Manufacture an Elastic Neutron Scattering Spectrometer at the Dalat Nuclear Reactor

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Journal of Analytical Sciences, Methods and Instrumentation 2021年第3期11卷 23-28页

作者： Dang Hong ngoc Quy pham ngoc Son Phan Bao Quoc Hieu Trinh Van Cuong Nuclear Research Institute Dalat Lam Dong Vietnam

The objective of this study is to design an elastic neutron scattering system according to the angle with a sample using thermal neutron beam at the Dalat Nuclear Reactor (DNR). The system is used for research and training in the field of material structure analysis by neutron scattering and diffraction techniques. It is designed on the basis of inheriting the neutron measurement spectrometer systems at the DNR and the scattered neutron measurement systems in the world. The measuring system, which was installed at the horizontal channel 4 of the DNR, consists of 5-helium-3 detectors and a fully electronic system to record the scatter counts and a mechanical system with the possibility of rotating at 15˚-75˚ angles. The constructed system is tested for evaluation of the accuracy, stability and reliability of the mechanical and electronic systems of moving detectors by angles.

关键词： Neutron Scattering Small-Angle Neutron Scattering (SANS) Elastic Neu-tron Cross Section

A New Method Combining Interior and Exterior Approaches for Linear Programming

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Journal of Mathematics and System Science 2015年第5期5卷 196-206页

作者： Nguyen ngoc Chu pham Canh Duong Le Thanh Hue Institute of Mathematics 18 Hoang Quoc Viet HanoL Vietnam. Center for Information Infrastructure Development Vietnamese Academy of Science and Technology 18 Hoang Quoc Viet HanoiVietnam. Faculty of lnformatics Technology University of Mining and Geology Hanoi Vietnam.

In this paper we present a new method combining interior and exterior approaches to solve linear programming problems. With the assumption that a feasible interior solution to the input system is known, this algorithm uses it and appropriate constraints of the system to construct a sequence of the so called station cones whose vertices tend very fast to the solution to be found. The computational experiments show that the number of iterations of the new algorithm is significantly smaller than that of the second phase of the simplex method. Additionally, when the number of variables and constraints of the problem increase, the number of iterations of the new algorithm increase in a slower manner than that of the simplex method.

关键词： Linear programming simplex method station cone.

Assessment of Salinity Intrusion in the Red River under the Effect of Climate Change

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Journal of Civil Engineering and Architecture 2010年第6期4卷 21-26页

作者： Le Thu Hien pham ngoc Quy Nguyen Trung Viet Faculty of Hydrology and Water Resoul＂ces Water Resources University Vietnam. Water Resources University Vietnam Department of Academic Affairs Water Resources University Vietnam

This paper focuses on analysis of salinity distribution along Red River and its main branches to determine and limit effects of salinity intrusion under variable scenarios for outlet discharge from upstream reservoirs and the tidal magnitude under global climate change effects. The effect of outlet discharge from upstream reservoirs, which generates flow in droughty months, is considered as upstream input condition for salinity intrusion. The sea level rising phenomenon is represented by scenarios according to prediction of the Intergovernmental Panel on Climate Change （IPCC）. The lateral flow and the rainfall in dry season are neglected in the process of simulation. MIKE 11, ID river model software by DHI （Danish Hydraulic Institute）, is used to simulate the processes of salt water intrusion from the river mouths to the upstream of the river in consideration the effect of the Sea Level Rise phenomenon and the operation of existing reservoirs and those under construction. The results indicate that salinity intrusion length from river mouth depends on the estuary characteristics, discharges from upper reservoirs and tidal phases （low and high tides）. With the safe salinity concentration for agriculture and livestock is 4 psu, the study shows that the length of intruded salt in Red River is about 40km from the river mouth, in otherwise, the effect of salinity intrusion in Thai Binh river is negligible. The Sea Level Rise phenomenon has inconsiderable affects on salinity intrusion processes in Red River System. The influence of outlet discharges from upstream reservoirs has also negligible affects on prevent salinity intrusion from the sea. According to the results of the study, reasonable water resources utilization and appropriate reservoir operation approaches in the drought will be studied to protect the crop and aquaculture from salinity intrusion.

关键词： Red River salinity intrusion reservoir climate change.

Hybrid Extragradient-Type Methods for Finding a Common Solution of an Equilibrium Problem and a Family of Strict Pseudo-Contraction Mappings

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Applied Mathematics 2012年第10期3卷 1357-1367页

作者： pham ngoc Anh Tran Dinh Quoc Dang Xuan Son Graduate student Hanoi Institute of Mathematics Hanoi Vietnam Hanoi University of Science Hanoi Vietnam Posts and Telecommunications Institute of Technology Hanoi Vietnam

This paper proposes a new hybrid variant of extragradient methods for finding a common solution of an equilibrium problem and a family of strict pseudo-contraction mappings. We present an algorithmic scheme that combine the idea of an extragradient method and a successive iteration method as a hybrid variant. Then, this algorithm is modified by projecting on a suitable convex set to get a better convergence property. The convergence of two these algorithms are investigated under certain assumptions.

关键词： Equilibrium Problems Fixed Point Pseudo-Monotone Lipschitz-Type Continuity Extragradient Method Strict Pseudo-Contraction Mapping

High burden of hepatocellular carcinoma and viral hepatitis in Southern and Central Vietnam:Experience of a large tertiary referral center,2010 to 2016

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World Journal of Hepatology 2018年第1期10卷 116-123页

作者： Song-Huy Nguyen-Dinh Albert Do Trang ngoc Doan pham Doan Y Dao Trinh Nhu Nguy Moon S Chen Jr Liver Tumor DepartmentCho Ray HospitalHo Chi Minh City 700000Vietnam Department of Internal Medicine Yale UniversityNew HavenCT 06510United States School of Public Health University of IllinoisChicagoIL 60302United States Division of Digestive and Liver Diseases UT Southwestern Medical CenterDallasTX 75390United States Vietnam Viral Hepatitis Alliance Ho Chi Minh City 7000Vietnam Davis Comprehensive Cancer Center University of CaliforniaSacramentoCA 95817United States

AIM To examine the largest tertiary referral center in southern and central Vietnam from 2010 to 2016, evaluating epidemiological trends of hepatocellular carcinoma(HCC) and viral hepatitis B-C in this resource-limited *** We extracted data of patients receiving care from Cho Ray Hospital(Ho Chi Minh City), the largest oncology referral center in southern and central Vietnam, from 2010 to 2016. We collected information on patient age, gender, geographic distribution, and disease characteristics including disease stage, tumor biomarker levels [serum alpha-fetoprotein(AFP), AFP-L3 isoform percentage, and prothrombin induced by induced by vitamin K absence-Ⅱ], and serological testing for hepatitis B virus(HBV) and hepatitis C virus(HCV) *** Data from 24091 HCC patients were extracted, with sample demographics comprising mostly male(81.8%) and older age(however with 8.5% younger than 40 years old). This patient sample included a geographic catchment population of 56 million people(60% of the country's total population of 92.7 million), derived from 38 provinces and municipalities in Vietnam. Chronic HBV infection was found in 62.3% of cases, and chronic HCV infection in 26.0%. HBV and HCV co-infection was seen in 2.7%. Cirrhosis was found in an estimated 30% to 40% of cases. Nine percent of patients were not found to have chronic viral hepatitis. Twenty three point two percent of the patients had a normal AFP level. A total of 2199 patients were tested with AFP-L3 and PIVKA Ⅱ over two years, with 57.7% having elevated AFP-L3%, and 88.5% with elevated PIVKA Ⅱ levels. Over this 7-year period, the incidence of HCC increased, with a large proportion of cases(overall 40.8%) presenting initially an advanced stage, not amendable to surgical or locoregional *** HCC contributes significant health care burden in southern and central Vietnam, with increasing case volume over this seven-year period. Viral hepatitis likely explains this high

关键词： Hepatocellular carcinoma Hepatitis B virus Hepatitis C virus Alpha-fetoprotein

排卵期女性用自然周期、改良自然周期或人工子宫内膜制剂进行一次冷冻胚胎移植后活产率的临床研究

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中国临床药理学杂志 2024年第16期40卷 2456-2456页

作者： HO V N A pham T D NGUYEN N T 孟海峰

本研究为一项随机、开放标签研究,研究对象为18~45岁的排卵期女性,受试者按照1:1:1的比例被随机分为自然周期组、改良自然周期组或人工周期组。由于研究干预措施的性质特殊,故本试验不设盲。自然周期组不使用雌激素、孕酮或人绒毛膜促... 详细信息

本研究为一项随机、开放标签研究,研究对象为18~45岁的排卵期女性,受试者按照1:1:1的比例被随机分为自然周期组、改良自然周期组或人工周期组。由于研究干预措施的性质特殊,故本试验不设盲。自然周期组不使用雌激素、孕酮或人绒毛膜促性腺激素(hCG);改良自然周期组使用hCG来触发排卵;人工周期组使用口服戊酸雌二醇(从月经第2~4天开始,每天8mg)和阴道孕酮(从子宫内膜厚度≥7mm开始,每天800mg)。

关键词：人工周期戊酸雌二醇子宫内膜厚度活产率自然周期冷冻胚胎移植排卵期孕酮

Rapid and efficient characterization of cervical collagen orientation using linearly polarized colposcopic images

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Journal of Innovative Optical Health Sciences 2023年第5期16卷 21-31页

作者： Cat Phan ngoc Khuong Dung Nguyen Huu Quang Hai pham Thanh Long Nguyen Quynh Nguyen ngoc Duc Le Huynh Tien Tran Van Tu Ly Anh Department of Applied Physics Ho Chi Minh City University of Technology 268 Ly Thuong Kiet Street District 10 Ho Chi Minh City 700000Vietnam Quality Management Department Tu Du Hospital 284 Cong QuynhDistrict 1 Ho Chi Minh City 700000Vietnam Department of Biomedical Engineering Nguyen Tat Thanh University 300A Nguyen Tat Thanh District 4Ho Chi Minh City 700000Vietnam Faculty of Science and Technology Jean Monnet University 11 Rue du Docteur Annino Saint Etienne 42000France

Collagen provides tissue strength and structural *** fication of the orientated dispersion of collagen fibers is an important factor when studying the mechanical properties of the *** this study,for the first time,a new method for rapid characterization of the collagen fiber orientations of the cervix using linearly polarized light colposcopy is presented.A total of 24 colposcopic images were captured using a cross-polarized imaging system with white LED light *** the preprocessing stage,the Red channel of the RGB image was chosen,which contains no information of the blood vessels because of the low-absorption of blood cells in the red ***,which is an ImageJ plug-in,was used to estimate the local orientation of the collagen *** result shows that in the nonpregnant cervix,the middle zone(Zone 2)has circumferentially aligned collagen fibers while the inner zone(Zone 1)has randomly *** collagen fiber dispersion in Zone 2 is much smaller than that in Zone 1 at all four quadrants region(anterior,posterior,left,and right quadrant).This new analysis technique could potentially combine with diagnostic tools to provide a quantitative platform of collagen fibers in the clinic.

关键词： Cervix collagen fibers collagen orientation coherency cross-polarized imaging colposcopy

Erratum to:Cadmium nanoclusters in a protein matrix:Synthesis,characterization,and application in targeted drug delivery and cellular imaging

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Nano Research 2024年第6期17卷 5755-5755页

作者： Morteza Sarparast Abolhassan Noori Hoda Ilkhani S.Zahra Bathaie Maher F.El-Kady Lisa J.Wang Huong pham Kristofer L.Marsh Richard B.Kaner Mir F.Mousavi Department of Chemistry Tarbiat Modares UniversityTehran 14115-175Iran Department of Clinical Biochemistry Faculty of Medical SciencesTarbiat Modares UniversityTehran 14115-111Iran Department of Chemistry and Biochemistry University of CaliforniaLos AngelesLos AngelesCA 90095USA Department of Chemistry Faculty of ScienceCairo UniversityGiza 12613Egypt California NanoSystems Institute University of CaliforniaLos AngelesLos AngelesCA 90095USA

The Electronic Supplementary Material available online erroneously only contains the first six pages of the entire supplementary material *** will find the entire supplementary material file online linked to this publisher’s *** publisher apologizes to the authors and readers for this *** Supplementary Material:Supplementary material(detailed description on procedures,and further characterizations,including synthesis,optimization,and characterization of CdNCs,HA-CdNCs,and DOX-HA-CdNCs;calculating quantum yield;a Jellium model for assigning the most valid number of the atoms in the NCs;drug loading and release;cellular uptake and cytotoxicity)is available in the online version of this article at https://***/10.1007/s12274-016-1201-z.

关键词： characterization matrix calculating

A THREE-PARAMETER FAULT-DETECTION SOFTWARE RELIABILITY MODEL WITH THE UNCERTAINTY OF OPERATING ENVIRONMENTS

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Journal of Systems Science and Systems Engineering 2017年第1期26卷 121-132页

作者： Kwang Yoon Song In Hong Chang Hoang pham Department of Computer Science and Statistics Chosun University Gwangju 62022 Korea Department of Industrial and Systems Engineering Rutgers University NJ 08855-8018 USA

As requirements for system quality have increased, the need for high system reliability is also increasing. Soflnvare systems are extremely important, in terms of enhanced reliability and stability, for providing high quality services to customers. However, because of the complexity of software systems, soft-ware development can be time-consuming and expensive. Many statistical models have been developed in the past years to estimate soflnvare reliability. In this paper, we propose a new three-parameter fault-detection software reliability model with the uncertainty of operating environments. The explicit mean value function solution for the proposed model is presented. Examples are presented to illustrate the goodness-of-fit of the proposed model and several existing non-homogeneous Poisson process （NHPP） models based on three sets of failure data collected from software applications. The results show that the proposed model fits significantly better than other existing NHPP models based on three criteria such as mean squared error （MSE）, predictive ratio risk （PRR）, and predictive power （PP）.

关键词： Nonhomogeneous Poisson process ratio risk predictive power fault detection software reliability mean squared error predictive