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Search Results: 1 - 10 of 16347 matches for " Nguyen Tran; Long "
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Quality of life profile and psychometric properties of the EQ-5D-5L in HIV/AIDS patients
Tran Bach,Ohinmaa Arto,Nguyen Long
Health and Quality of Life Outcomes , 2012, DOI: 10.1186/1477-7525-10-132
Abstract: Objectives We assessed health-related quality of life (HRQOL), its associated factors, and examined measurement properties of the EuroQol - 5 Dimensions - 5 Levels (EQ-5D-5L) in HIV/AIDS patients. Methods A cross-sectional multi-site survey was conducted in 1016 patients (age: 35.4 ± 7.0 years; 63.8% male) in three epicenters of Vietnam. Internal consistency reliability, convergent validity, and discriminative validity of the EQ-5D-5L and a visual analogue scale (VAS) were evaluated. Tobit censored regression models were used to identify predictors of HRQOL in HIV/AIDS patients. Results The mean EQ-5D-5L single index and VAS were 0.65 (95% Confidence Interval (CI) = 0.63; 0.67) and 70.3 (95% CI = 69.2; 71.5). Cronbach’s alpha of five dimensions was 0.85. EQ-5D-5L has a good convergent validity with VAS (0.73). It discriminated patients at different HIV/AIDS stages, duration of ART, and CD4 cell count. Predictors of poorer HRQOL included being female, lower education level, unemployment, alcohol and drug use, CD4<200 cells/mL, and advanced HIV/AIDS stages. Conclusion The EQ-5D-5L has good measurement properties in HIV/AIDS patients and holds potentials for monitoring ART outcomes. Integration of HRQOL measurement using EQ-5D-5L in HIV/AIDS clinical practice could be helpful for economic evaluation of HIV/AIDS interventions.
Characterization of Electrochromic Properties of Polyaniline Thin Films Electropolymerized in H2SO4 Solution  [PDF]
Dang Hai Ninh, Tran Thi Thao, Pham Duy Long, Nguyen Nang Dinh
Open Journal of Organic Polymer Materials (OJOPM) , 2016, DOI: 10.4236/ojopm.2016.61004

Polyaniline (PANI) onto indium-doped tin-oxide (ITO)-coated glass samples were prepared by electroopolymerization in 0.5 M H2SO4 solution. Structure and morphology characterization of the PANI films demonstrated that the films were grown onto ITO substrates in the form of polycrystalline microbelts separated by micropores. By analysing the UV-Vis absorption spectra of the PANI films, the energy bandgap was found to be approximately 2.75 eV. The PANI/ITO films exhibited a good reversible electrochromic display (ECD) performance when cycled in 0.1 M LiClO4 + pro-pylene carbonate. The response time of the ECD coloration was found to be as small as 15 s and the coloration efficiency was found to be 8.85 cm2 \"\"C-1. After 100 cycles of the ECD performance, the cyclic voltammetry curve of the working electrode maintained unchanged. This demonstrates that the electropolymerized PANI films can be served as a good candidate for ECD applications, taking advantage of their excellent properties in terms of chemical stability.

Optical and NH3 Gas Sensing Properties of Hole-Transport Layers Based on PEDOT: PSS Incorporated with Nano-TiO2  [PDF]
Lam Minh Long, Tran Quang Trung, Vo-Van Truong, Nguyen Nang Dinh
Materials Sciences and Applications (MSA) , 2017, DOI: 10.4236/msa.2017.89047
Abstract: Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) incorporated with nanocrystalline TiO2 powder (PEDOT:PSS+nc-TiO2) films were prepared by spin-coating technique. SEM surface morphology, UV-Vis spectra and NH3 gas sensing of were studied. Results showed that the PEDOT:PSS+nc-TiO2 film with a content of 9.0 wt% of TiO2 is most suitable for both the hole transport layer and the NH3 sensing. The responding time of the sensor made from this composite film reached a value as fast as 20 s. The rapid responsiveness to NH3 gas was attributed to the efficient movement of holes as the major charge carriers in PEDOT:PSS+nc-TiO2 composite films. Useful applications in organic electronic devices like light emitting diodes and gas thin film sensors can be envisaged.
On a shock problem involving a nonlinear viscoelastic bar
Long Nguyen Thanh,Dinh Alain Pham Ngoc,Diem Tran Ngoc
Boundary Value Problems , 2005,
Abstract: We treat an initial boundary value problem for a nonlinear wave equation in the domain , . The boundary condition at the boundary point of the domain for a solution involves a time convolution term of the boundary value of at , whereas the boundary condition at the other boundary point is of the form with and given nonnegative constants. We prove existence of a unique solution of such a problem in classical Sobolev spaces. The proof is based on a Galerkin-type approximation, various energy estimates, and compactness arguments. In the case of , the regularity of solutions is studied also. Finally, we obtain an asymptotic expansion of the solution of this problem up to order in two small parameters , .
On a shock problem involving a nonlinear viscoelastic bar
Nguyen Thanh Long,Alain Pham Ngoc Dinh,Tran Ngoc Diem
Boundary Value Problems , 2005, DOI: 10.1155/bvp.2005.337
Abstract: We treat an initial boundary value problem for a nonlinear wave equation utt ¢ ’uxx+K|u| ±u+ |ut| 2ut=f(x,t) in the domain 0 Keywords
Determinants of antiretroviral treatment adherence among HIV/AIDS patients: a multisite study
Bach Xuan Tran,Long Thanh Nguyen,Nga Hoang Nguyen,Quynh Van Hoang
Global Health Action , 2013, DOI: 10.3402/gha.v6i0.19570
Abstract: Introduction: Adherence to antiretroviral treatment (ART) is vital in achieving virological treatment success. This study assessed the prevalence of optimal ART adherence and its determinants among HIV/AIDS patients in Vietnam. Method: A cross-sectional survey was conducted with 1,016 HIV/AIDS patients at seven hospitals and health centers providing antiretroviral treatment services in three provinces, including Hanoi, Hai Phong, and Ho Chi Minh City. Self-reported medication adherence was measured using a 30-day visual analog scale (VAS) and 7-day missed-doses questions. Results: The mean adherence VAS-score was 94.5 out of 100 (SD=8.2), ranging from 40 to 100%. The rate of suboptimal adherence was 25.9%. The rate of missed-doses was 25.2%. In multivariate analysis, increased perceived self-efficacy, use of mobile phone alarms, and reminders from family members were associated with optimal adherence; higher CD4 level, single status, and unstable employment were associated with suboptimal adherence. Conclusion: High rate of suboptimal adherence observed in this study highlights the importance of adherence support interventions during ART. The use of mobile phone reminders, involvement of relatives, and HIV self-management training programs have the potential to improve ART adherence in Vietnam.
On a Nonlinear Wave Equation Associated with Dirichlet Conditions: Solvability and Asymptotic Expansion of Solutions in Many Small Parameters
Le Thi Phuong Ngoc,Le Khanh Luan,Tran Minh Thuyet,Nguyen Thanh Long
ISRN Applied Mathematics , 2011, DOI: 10.5402/2011/625908
Human immunodeficiency virus (HIV) infection patterns and risk behaviours in different population groups and provinces in Viet Nam
Tuan,Nguyen Anh; Fylkesnes,Knut; Thang,Bui Duc; Hien,Nguyen Tran; Long,Nguyen Thanh; Van Kinh,Nguyen; Thang,Pham Hong; Manh,Pham Duc; O'Farrell,Nigel;
Bulletin of the World Health Organization , 2007, DOI: 10.1590/S0042-96862007000100010
Abstract: objective: to study patterns and determinants of hiv prevalence and risk-behaviour characteristics in different population groups in four border provinces of viet nam. methods: we surveyed four population groups during april-june 2002. we used stratified random-cluster sampling and collected data concomitantly on hiv status and risk behaviours. the groups included were female sex workers (n = 2023), injecting drug users (n = 1391), unmarried males aged 15-24 years (n = 1885) and different categories of mobile groups (n = 1923). findings: we found marked geographical contrasts in hiv prevalence, particularly among female sex workers (range 0-24%). the hiv prevalence among injecting drug users varied at high levels in all provinces (range 4-36%), whereas lower prevalences were found among both unmarried young men (range 0-1.3%) and mobile groups (range 0-2.5%). all groups reported sex with female sex workers. less than 40% of the female sex workers had used condoms consistently. the strongest determinants of hiv infection among female sex workers were inconsistent condom use (adjusted odds ratio [or], 5.3; 95% confidence interval [ci], 2.4-11.8), history of injecting drug use and mobility, and, among injecting drug users, sharing of injection equipment (adjusted or, 7.3; 95% ci, 2.3-24.0) and sex with non-regular partners (adjusted or 3.4; 95% ci 1.4-8.5). conclusion: the finding of marked geographical variation in hiv prevalence underscores the value of understanding local contexts in the prevention of hiv infection. although lacking support from data from all provinces, there would appear to be a potential for sex work to drive a self-sustaining heterosexual epidemic. that the close links to serious injecting drug use epidemics can have an accelerating effect in increasing the spread of hiv merits further study.
Using lot quality-assurance sampling and area sampling to identify priority areas for trachoma control: Viet Nam
Myatt,Mark; Mai,Nguyen Phuong; Quynh,Nguyen Quang; Nga,Nguyen Huy; Tai,Ha Huy; Long,Nguyen Hung; Minh,Tran Hung; Limburg,Hans;
Bulletin of the World Health Organization , 2005, DOI: 10.1590/S0042-96862005001000012
Abstract: objective: to report on the use of lot quality-assurance sampling (lqas) surveys undertaken within an area-sampling framework to identify priority areas for intervention with trachoma control activities in viet nam. methods: the lqas survey method for the rapid assessment of the prevalence of active trachoma was adapted for use in viet nam with the aim of classifying individual communes by the prevalence of active trachoma among children in primary school. schoolbased sampling was used; school sites to be sampled were selected using an area-sampling approach. a total of 719 communes in 41 districts in 18 provinces were surveyed. findings: survey staff found the lqas survey method both simple and rapid to use after initial problems with area-sampling methods were identified and remedied. the method yielded a finer spatial resolution of prevalence than had been previously achieved in viet nam using semiquantitative rapid assessment surveys and multistage cluster-sampled surveys. conclusion: when used with area-sampling techniques, the lqas survey method has the potential to form the basis of survey instruments that can be used to efficiently target resources for interventions against active trachoma. with additional work, such methods could provide a generally applicable tool for effective programme planning and for the certification of the elimination of trachoma as a blinding disease.
HIV Infection, Risk Factors, and Preventive Services Utilization among Female Sex Workers in the Mekong Delta Region of Vietnam
Bach Xuan Tran, Thuong Vu Nguyen, Quang Duy Pham, Phuc Duy Nguyen, Nghia Van Khuu, Nhung Phuong Nguyen, Duc Hoang Bui, Huong Thu Thi Phan, Long Thanh Nguyen
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0086267
Abstract: Background Risk behaviors among female sex workers (FSW) are considerable drivers of HIV infections in Vietnam, especially transmission between high-risk and low-risk groups. We assessed HIV prevalence and its correlates among FSWs, and the use of preventive services among this community in the Mekong Delta region, southern Vietnam. Methods A cross-sectional survey of 1,999 FSWs was carried out in five provinces including Ben Tre, Hau Giang, Kien Giang, Tien Giang, and Vinh Long between June, 2006 and June, 2007. We interviewed participants face-to-face in order to elicit information about their lives and potential risk factors, and we tested their sera to determine their HIV status. We then performed multivariate logistic regression analyses to investigate factors associated with HIV infection. Results Seventeen percent of the participating FSWs were street-based sex workers (SSWs) and the rest (83%) were entertainment establishment-based sex workers (ESWs). Unprotected sex with regular and casual clients in the past month was frequent among study participants (40.5% and 33.5% respectively). However, few respondents (1.3%) had ever injected drugs. Only 2.1% (95% confidence interval (CI): 1.6%–2.8%) of FSWs were found to be infected with HIV. HIV prevalence among SSWs was greater than among ESWs (3.8% vs. 1.8%, p = 0.02, respectively). Increased risk for HIV infection was significantly associated with the number of clients per month (adjusted odd ratio (aOR) = 2.65, 95% CI: 1.26–5.59). Conclusions Interventions to reduce unsafe sex and drug injection, and to increase uptake of HIV testing among FSWs are necessary. Differences in HIV prevalence and its correlates by type of sex work emphasize the importance of constrained contexts in shaping risk behaviors among FSWs; that should be considered in designing HIV prevention programs.
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