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An Analytical Approach for Nonlinear Buckling Analysis of Torsionally Loaded Sandwich Carbon Nanotube Reinforced Cylindrical Shells with Auxetic Core

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Advances in Applied Mathematics and Mechanics 2023年第2期15卷 468-484页

作者： Dang thuy Dong nguyen thi Phuong Vu Hoai Nam Le Ngoc Ly nguyen Van Tien Vu Minh Duc Tran Quang Minh Vu Tho Hung nguyen thi huong Giang Faculty of Civil Engineering University of Transport TechnologyHanoi 100000Vietnam Graduate School of Advanced Science and Engineering Hiroshima University1-4-1 KagamiyamaHigashi-HiroshimaHiroshima 739-8527Japan Faculty of Fundamental Science for Engineering University of Transport TechnologyHanoi 100000Vietnam

The main aim of this paper is to present an analytical approach on the postbuckling for torsionally loaded sandwich carbon nanotube(CNT)reinforced cylindrical shells with the auxetic *** considered shells consist of three layers,external and internal CNT reinforced layers,and the auxetic lattice core made by isotropic *** homogenization model for honeycomb auxetic lattice core is utilized,and the equilibrium equations are formulated based on the nonlinear Donnell’s thin shell theory with von Karman geometrical *** three terms of deflection are considered,the Airy’s stress function and Galerkin’s method are utilized,the explicit expression of critical buckling of torsionally loaded shells and load-deflection expression of postbuckling states are *** effects of two carbon nanotube reinforced layers,the auxetic core layer,the volume fraction of carbon nanotube on the torsional buckling behavior are examined and remarked.

关键词： Nonlinear postbuckling carbon nanotube reinforced composite cylindrical shell torsion auxetic core

Changes of Food Expenditure and Food Consumption of People Living in Ba Vi District, Hanoi, Vietnam from 1999 to 2013

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Health 2015年第12期7卷 1696-1702页

作者： huong Le thi Phuong Le Hong Thanh nguyen Hoang Giang nguyen thu Xuan Le thi Thanh Chuc nguyen thi Kim Nga thi thu Vu Institute for Preventive Medicine and Public Health Hanoi Medical University Hanoi Vietnam

Background: During the nutrition transition period which began in the early 1990s in Vietnam, dietary intake had been changed significantly because of changes in lifestyle and living standard. Objectives: this paper aims to describe the trend for food expenditure and the frequency of meat consumption in households in Ba Vi district, Hanoi, Vietnam from 1999 to 2013. Methods: this is a longitudinal study conducted in Ba Vi district, Hanoi. Semi-annual, face-to face interviews were conducted by well-trained interviewers with 11,922 households to collect data of the household’s income, spending for food and meat consumption. Chi-square test for trend was performed to evaluate the changes of food expenditure over the years. P-value under 0.05 was considered statistically significant. Results: There were ten times increase in household’s mean income and five times increase in mean food expenditure from 1999 to 2013. The percentage of household food expenditure per total family expenditure was really high (55% in 2013). The percentage of rice expenditure per total food expenditure decreased dramatically from 59.9% in 1999 to 33.1% in 2013 while spending for other animal-based, high-protein food was an upward trend, particularly meat (10.7% in 1999 to 24.2% in 2013). The percentage of rice expenditure in well-off households was lower than poor households (55% vs. 61.8% in 1999 and 31.4% vs. 36.5% in 2013). However, the percentage of spending for meat in well-off households were much higher than that of poor households (>10%). Conclusion: Our finding indicated that mean income and food expenditure, particularly meat intake, of households had increased dramatically from 1999 to 2013. The increase of meat intake requires reallocation and direction of Vietnam public health funding and strategy.

关键词： Vietnam Income Food Expenditure Meat Consumption

Nutritional status of Vietnamese infants assessed by Fenton growth chart and related factors:A cross-sectional study

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Pediatric Investigation 2023年第4期7卷 254-262页

作者： Lieu thu thi nguyen Cuong Danh Tran Ha thu thi nguyen Hai Thanh Phan Linh thuy nguyen huong Lan thi nguyen Anh Hoai thi Ta Chau Quynh thi Pho Khanh Nam Do Anh Kim Dang huong thi Le School of Preventive Medicine and Public Health Hanoi Medical UniversityHanoiVietnam Department of Nutrition National Hospital of Obstetrics and GynecologyHanoiVietnam Department of General Obstetrics National Hospital of Obstetrics and GynecologyHanoiVietnam Department of Nutrition and Dietetics Hanoi Medical University HospitalHanoiVietnam Queensland Alliance for Environmental Health Sciences(QAEHS) The University of QueenslandBrisbaneAustralia

Importance:Nutritional status of infants,measured by birth weight and length,is an essential factor in neonatal *** in newborns may lead to a higher risk of mortality,neurological and cognitive impairment,and poor language ***:this study aims to assess the nutritional status of infants and related factors regarding maternal anthropometric characteristics and medical ***:A cross-sectional study was conducted at the National Hospital of Obstetrics and Gynecology,Vietnam from May 2021 to May 2022 on 340 infants and *** birth weight was defined following the Intergrowth-21 *** was evaluated using the Fenton growth chart when the length was below the 10%percentile line of the gestational *** regression models were applied to identify factors associated with the nutritional status of ***:We found that 12.4%and 14.1%of infants in our study fell into stunted and underweight categories,*** of mothers over 35 years old,having a height lower than 150 cm or experiencing anemia during pregnancy were more likely to be stunted or have low birth *** albumin deficiency during pregnancy was strongly associated with the infant being underweight(odds ratio[OR]=2.8,95%confidence interval[95%CI]1.1–7.3).Newborns were more likely to be stunted if their mothers had a history of preterm birth(OR=3.3,95%CI 1.1–10.2).Interpretation:Maternal nutritional status is closely related to infant malnutrition,particularly in preterm *** the understanding of mothers regarding prenatal care,reproductive healthcare,adequate nutritional diet,and multi-micronutrient supplements during pregnancy is therefore important.

关键词： Fenton chart Infant Low birth weight Stunting Underweight

Modelling and Numerical Valuation of Power Derivatives in Energy Markets

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Advances in Applied Mathematics and Mechanics 2012年第3期4卷 259-293页

作者： Mai huong nguyen Matthias Ehrhardt Institut fur Mathematik Technische Universitat BerlinStrasse des 17.Juni 13610623 BerlinGermany Lehrstuhl fur Angewandte Mathematik und Numerische Analysis Fachbereich C-Mathematik und NaturwissenschaftenBergische Universitat WuppertalGaußstr.2042119 WuppertalGermany

In this work we investigate the pricing of swing options in a model where the underlying asset follows a jump diffusion *** focus on the derivation of the partial integro-differential equation(PIDE)which will be applied to swing contracts and construct a novel pay-off function from a tree-based pay-off matrix that can be used as initial condition in the PIDE *** valuing swing type derivatives we develop a theta implicit-explicit finite difference scheme to discretize the PIDE using a Gaussian quadrature method for the integral *** on known results for the classical theta-method the existence and uniqueness of solution to the new implicit-explicit finite difference method is *** numerical examples illustrate the usability of the proposed method and allow us to analyse the sensitivity of swing options with respect to model *** particular the effects of number of exercise rights,jump intensities and dividend yields will be investigated in depth.

关键词： Swing options jump-diffusion process mean-reverting Black-Scholes equation energy market partial integro-differential equation theta-method Implicit-Explicit-Scheme

Nutritional Practices among Ethnic Minorities and Child Malnutrition in Mountainous Areas of Central Vietnam

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Food and Nutrition Sciences 2013年第1期4卷 82-89页

作者： Le thi huong Vu thi thu Nga Institute of Preventive Medicine and Public Health Hanoi Medical University Hanoi Vietnam.

Background: Despite the success of National Action Plan on Nutrition program in reducing malnutrition among children under 5 years old in Vietnamin recent years, the rate of malnutrition inVietnamremains higher than that rate in other surrounding countries. The rate is especially high in mountainous areas. this study aims to explore the association between the mother’s nutrition care practice and the nutritional status of their children. Methods: 400 Children under 5 years of age and their mothers from Thanh Hoa—a Northern Province of Vietnam were included in this survey. Weight and height of the children were measured. Information related to the mother’s knowledge and practices pertaining to child health care and nutrition was collected. Results: The malnutrition rate was 29.3% by weight for age score (WAZ), 28.3% by height for age score (HAZ) and 10.0% by weight for height score (WHZ). 27.3% of mothers discarded the colostrum milk. 21.3% of children were fed with chewing rice before breastfeeding. Exclusive breastfeeding up to four months was 17.8% and exclusive breastfeeding rates for 6 months or more was 8.6%. Weaning practice before four months of age was 53.7%. There was an association between malnutrition with mother’s ethnic group, and the frequency of consumption of protein rich food. Conclusion: Malnutrition of ethnic minority children under five years of age is still a public health problem in the central mountainous areas ofVietnam. Inappropriate breastfeeding and weaning practice among ethnic minority women were associated with this high rate. Further effort should continue to improve the nutrition status of ethnic minority children under 5 years of age. Customized, culturally adapted interventions for ethnic minority women to strengthen their nutrition care knowledge, attitude and practice, especially breastfeeding and weaning practice are the key to achieving better nutrition status of their children.

关键词： Malnutrition Children Knowledge and Practice Vietnam

Simultaneous Quantitative Analysis of Five Components in Angelica sinensis and Angelica acutiloba Acclimatized Growing in Vietnam by High-Performance Liquid Chromatography with Photodiode Array Detector

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World Journal of Traditional Chinese Medicine 2021年第1期7卷 6-10页

作者： thi Minh Tam Pham thi thu Cuc Le Van Thanh nguyen Viet Hung Tran Departments of Microbiology Institute of Drug Quality ControlHo Chi Minh City Departments of Instrumental Analysis Institute of Drug Quality ControlHo Chi Minh City Institute of Drug Quality Control Ho Chi Minh City Faculty of Pharmacy Nguyen Tat Thanh UniversityHo Chi Minh CityVietnam

Background:Chinese Danggui(Angelica sinensis)and Japanese Danggui(Angelica acutiloba)are evaluated as the same in using and critical of quality control in Vietnamese *** Vietnam,Japanese Danggui were acclimatized and cultivated in several regions in recent *** the huge climatic difference between Vietnam and Japan,Japanese Danggui grows very well in ***,there are no studies to assess the overall quality of this medicinal *** and Objectives:The aim of this study is to develop a method to identify and assay simultaneously 5 component compounds of these crude herbs:chlorogenic acid,ferulic acid,scopoletin,xanthotoxin and ligustilide by high-performance liquid chromatography with photodiode array detector(HPLC-PDA).Materials and Methods:The procedure was optimized by using column Phenomenex Gemini 5μm PR C18,15 x 4,6 mm with the detection wavelength set at 321 nm for detector PDA and mobile phase was composed of(A)ACN and(B)aqueous solution 1%of acid acetic using a gradient *** were performed at 30°C with a flow rate of 1.0 mL/***:The developped method were fully validated for linearity,accuracy,recovery and met the validation requirements,proved practical applicability for the quality control of these herbs and related ***:The method was successfully applied to the quantification of five markers simultaneously from collected samples.

关键词： Chlorogenic acid Danggui ferulic acid ligustilide scopoletin xanthotoxin

A crate of Pandora:do amyloids from bacteria promote Alzheimer’s disease?

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Neural Regeneration Research 2021年第5期16卷 988-989页

作者： Vu thu thuy nguyen Kristina Endres Department of Psychiatry and Psychotherapy University Medical Center Johannes Gutenberg-University MainzMainzGermany

Incidence for microbes as drivers of Alzheimer’s disease(AD)pathology:AD is the predominant neurodegenerative disease within the *** 50 million patients suffer from dementia currently world-wide and an estimated tripling of numbers within the next 30 years is *** one to maximally five percent of all cases of AD are based on mutations in the amyloid precursor protein(APP)gene or within the presenilin genes(PS1/PS2)and therefore are called familial(FAD).The majority of cases has to be designated as sporadic,which frankly only means that the origin of these cases is still enigmatic.

关键词： amyloid Alzheimer pathology

Isolation and Identification of Two Flavonoid Compounds from Acclimatized Angelica acutiloba Kitagawa Growing in Vietnam

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World Journal of Traditional Chinese Medicine 2022年第3期8卷 413-416页

作者： thi Minh Tam Pham thi thu Cuc Le Viet Hung Tran Van Thanh nguyen Department of Microbiology Institute of Drug Quality ControlDepartment of Analytical Chemistry and Quality ControlUniversity of Medicine and PharmacyHo Chi Minh CityVietnam Department of Analytical Chemistry and Quality Control Nguyen Tat Thanh UniversityHo Chi Minh CityVietnam Department of Microbiology Institute of Drug Quality ControlHo Chi Minh CityVietnam

Traditional Vietnamese Medicine has its own development based on the local endemic herbs,but it also inherits from Traditional Chinese Medicine using Chinese herbal *** the history of cultural exchange between two countries,the adoption of Chinese Danggui,Angelica sinensis(Oliv.)Diels.,has been made by Vietnamese traditional medicine practitioners for a long ***,the acclimatization has never been *** Danggui,or Angelica acutiloba Kitagawa,is recently being acclimatized and cultivated in several Vietnamese *** the huge climate change between the two countries,the herb adapted exquisitely well to the humid tropical ***,so far,there are no studies that have evaluated the effect of acclimatization on the overall quality of this medicinal *** aim of our study is screening secondary metabolites of this acclimatized herb for new natural compound(s),if *** analysis of flavonoid fraction from this herb led to the identification of two known compounds which previously have not been isolated from this species *** detection showed that the herb has reacted to the new environment.

关键词： Abiotic stress Angelica acutiloba danggui isoquercitrin rutin

Assessment of Post-Laparoscopic Cholecystectomy Pain at Viet Duc Hospital, Vietnam

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Health 2015年第3期7卷 346-354页

作者： Dan thi nguyen huong thi Thanh nguyen Hanoi Medical University Hanoi Vietnam Faculty of Nursing and Midwifery Hanoi Medical University Hanoi Vietnam

Gallstones are common and costly in the world. this disease also have high health burden with high mortality. Currently, Laparoscopic Cholecystectomy has become a gold standard for surgical treatment of symptomatic gallstones. Pain is usually the first concern after surgery. Postoperative pain decreases with time but it is severe enough to interfere with daily activities of patients. Pain after the surgery is also affected by many factors. this cross-sectional study aimed to 1) assess pain intensity and interference pain with daily activities;2) describe the association between pain intensity and interference with daily activities of patients;3) explore factors that influence post-operative pain after Laparoscopic Cholecystectomy. Data were collected by 50 patients who were undergoing Laparoscopic Cholecystectomy completed questionnaire including the Visual Analogue Scale (VAS) and the Brief Pain Inventory (BPI). Data were analyzed based on three aims. As this is the first time that this type of study is conducted in Vietnam, it is expected that the results will contribute significantly to local knowledge and should add to global perspectives. From understanding the factors that affect severity of pain, this study is expected to design nursing intervention strategies to improve daily activities among patients undergoing LC.

关键词： Gallstones Laparoscopic Cholecystectomy Pain Intensity Interference with Daily Activities