Search results for: Viet Hung Pham

Items from 1 to 20 out of 43 results

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Growth in children infected with HIV receiving anti‐retroviral therapy in Vietnam

Vu Phuong Linh Dang, Viet Hung Pham, Thi Thanh Dinh, Thanh Hai Le, more

Pediatrics International > 61 > 4 > 369 - 374

Background There are currently two markers used to monitor treatment response to anti‐retroviral therapy (ART) in HIV‐infected children: CD4 T‐cell count and HIV viral load; but analysis of these could be challenging in resource‐poor countries. The aim of this study was therefore to determine whether change in growth parameters such as weight‐for‐age Z score (WAZ), height‐for‐age Z score (HAZ) and...

article

Persistence Probability of Random Weyl Polynomial

Van Hao Can, Viet-Hung Pham

Journal of Statistical Physics > 2019 > 176 > 1 > 262-277

In this paper, we obtain the persistence exponents of random Weyl polynomials in both cases: the nonnegative axis and the whole real axis. Our result confirms the predictions given by Schehr and Majumdar (J Stat Phys 132(2):235–273, 2008). In the nonnegative axis case, Dembo and Mukherjee (Ann Probab 43(1):85–118, 2015) gave an upper bound for the persistence exponent by considering the persistence...

article

Hydrogenated TiO2@reduced graphene oxide sandwich-like nanosheets for high voltage supercapacitor applications

Viet Hung Pham, Thuy-Duong Nguyen-Phan, Xiao Tong, Balasubramaniyan Rajagopalan, more

Carbon > 2018 > 126 > C > 135-144

Hydrogenated TiO₂ has recently attracted considerable attention as potential electrode materials for supercapacitors due to its abundance, low cost, high conductivity, remarkable rate capability, and outstanding long-term cycling stability. Herein, we demonstrate the synthesis of hydrogenated TiO₂ nanoparticles anchored on reduced graphene oxide nanosheets (HTG) in the form of sandwich-like nanosheet...

article

Institutional trading before dividend reduction announcements

Darren Henry, Lily Nguyen, Viet Hung Pham

Journal of Financial Markets > 2017 > 36 > C > 40-55

Using a large proprietary database of transaction-level institutional trades for the 1997–2011 period, we find that institutional investors are net sellers in dividend reduction firms during the two quarters prior to the announcements. They also trade more intensively in firms that do not prepare the market for dividend cuts or that have greater information asymmetry. Trading by both pension plan...

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Clinical characteristics of pediatric HIV-1 patients treated with first-line antiretroviral therapy in Vietnam: a nested case–control study

Minh Diem Dang, Duc Minh Nguyen, Huu Bich Tran, Viet Hung Pham, more

International Journal of Public Health > 2017 > 62 > 1 > 113-119

Objectives Over the past decades, Vietnam has made great strides in reducing the rate of mortality in HIV-related deaths, due to increased access of antiretroviral therapy (ART); however, given the significantly high level of treatment failure (TF), it is essential to identify markers that describe the failure of ART in HIV-1 infected children. Methods A nested case–control study was conducted with...

article

Asymptotic formula for the tail of the maximum of smooth stationary Gaussian fields on non locally convex sets

Jean-Marc Azaïs, Viet-Hung Pham

Stochastic Processes and their Applications > 2016 > 126 > 5 > 1385-1411

In this paper we consider the distribution of the maximum of a Gaussian field defined on non locally convex sets. Adler and Taylor or Azaïs and Wschebor give the expansions in the locally convex case. The present paper generalizes their results to the non locally convex case by giving a full expansion in dimension 2 and some generalizations in higher dimension. For a given class of sets, a Steiner...

article

Effect of reduced graphene oxide functionalization by sulfanilic acid on the mechanical properties of poly(styrene‐co‐acrylonitrile)/reduced graphene oxide composites

Thi Diem Tuyet Vu, Viet Hung Pham, Seung Hyun Hur, Jin Suk Chung

Polymer Composites > 37 > 1 > 44 - 50

The sulfonation of reduced graphene oxide (SRGO) by the aryl diazonium salt of sulfanilic acid was focused to examine the enhancement effect on the mechanical properties of poly styrene‐acrylonitrile (SAN). The SAN was prepared by surfactant‐free emulsion copolymerization using a cationic initiator. By mixing sulfonated RGO (SRGO) into the SAN polymer matrix, positively‐charged SAN particles were...

article

Photocatalytic performance of Sn-doped TiO2/reduced graphene oxide composite materials

Thuy-Duong Nguyen-Phan, Viet Hung Pham, Jin Suk Chung, Manish Chhowalla, more

Applied Catalysis A, General > 2014 > 473 > Complete > 21-30

Composite materials of Sn-doped TiO ₂ nanoparticles (4–6nm) uniformly anchored onto reduced graphene oxide (RGO) sheets were fabricated by a hydrothermal process. When compared with an undoped TiO ₂ /RGO composite material, the partial substitution of Sn ⁴⁺ for Ti ⁴⁺ in TiO ₂ /RGO in different doping concentrations not only increased the specific surface area,...

article

Synthesis of epoxy encapsulated organoclay nanocomposite latex via phase inversion emulsification and its gas barrier property

Viet Hung Pham, Yong Woo Ha, Sang Hun Kim, Ha Taek Jeong, more

Journal of Industrial and Engineering Chemistry > 2014 > 20 > 1 > 108-112

Waterborne epoxy–clay nanocomposites were prepared by encapsulation of organoclays in epoxy latex particles via phase inversion emulsification. The organoclays were exfoliated in the epoxy backbone before compounding with a hardener and subsequently dispersing in water. The encapsulation of clay platelets into the waterborne epoxy latex particle resulted in an exponential increase in particle size,...

article

Effects of the alkylamine functionalization of graphene oxide on the properties of polystyrene nanocomposites

Jinhee Jang, Viet Hung Pham, Balasubramaniyan Rajagopalan, Seung Hyun Hur, more

Nanoscale Research Letters > 2014 > 9 > 1 > 1-6

Alkylamine-functionalized graphene oxides (FGOs) have superior dispersibility in low-polar solvents and, as a result, they interact with low-polar polymers such as polystyrene. In this work, the functionalization of graphene oxide using three types of alkylamines, octylamine (OA), dodecylamine (DDA), and hexadecylamine (HDA), was performed, and nanocomposites of polystyrene (PS) and FGOs were prepared...

article

Liquid phase co-exfoliated MoS2–graphene composites as anode materials for lithium ion batteries

Viet Hung Pham, Kwang-Hyun Kim, Dong-Won Jung, Kuldeep Singh, more

Journal of Power Sources > 2013 > 244 > Complete > 280-286

We report a facile method to prepare the MoS ₂ –graphene composites by liquid phase co-exfoliation of commercial MoS ₂ with graphene nanoplatelet (GnP) and chemically converted graphene (CCG) in N-methyl pyrrolidone with the aid of ultrasonication. The combination of SEM, XRD and BET results reveal that the MoS ₂ –graphene composites are mesoporous materials consisting of very...

article

Role of macroporosity in macro-mesoporous red mud catalysts for slurry-phase hydrocracking of vacuum residue

Chinh Nguyen-Huy, Viet Hung Pham, Do Kyoung Kim, Do-Woan Kim, more

Applied Catalysis A, General > 2013 > 468 > Complete > 305-312

To improve the catalytic performance of red mud (RM) for slurry-phase hydrocracking of vacuum residue, macro-mesoporosity was introduced into RM using polystyrene and Pluronic F-127 as co-templates in this study. The obtained macro-mesoporous red mud (Ma-RM) catalysts were characterized by nitrogen adsorption, X-ray diffraction, ammonia temperature-programmed desorption, scanning electron microscopy,...

article

Adsorption of pharmaceuticals onto trimethylsilylated mesoporous SBA-15

Tung Xuan Bui, Viet Hung Pham, Son Thanh Le, Heechul Choi

Journal of Hazardous Materials > 2013 > 254-255 > C > 345-353

The adsorption of a complex mixture of 12 selected pharmaceuticals to trimethylsilylated mesoporous SBA-15 (TMS-SBA-15) has been investigated by batch adsorption experiments. The adsorption of pharmaceuticals to TMS-SBA-15 was highly dependent on the solution pH and pharmaceutical properties (i.e., hydrophobicity (logK_ow) and acidity (pK_a)). Good log–log linear relationships between the adsorption...

article

On the rate of convergence for central limit theorems of sojourn times of Gaussian fields

Viet-Hung Pham

Stochastic Processes and their Applications > 2013 > 123 > 6 > 2158-2174

The aim of this paper is to control the rate of convergence for central limit theorems of sojourn times of Gaussian fields in both cases: the fixed and the moving level. Our main tools are the Malliavin calculus and the Stein method, developed by Nualart, Peccati and Nourdin. We also extend some results of Berman to the multidimensional case.

article

A one pot solution blending method for highly conductive poly (methyl methacrylate)-highly reduced graphene nanocomposites

R. Balasubramaniyan, Viet Hung Pham, Jinhee Jang, Seung Hyun Hur, more

Electronic Materials Letters > 2013 > 9 > 6 > 837-839

PMMA-HRG (Poly (methyl methacrylate)-highly reduced graphene) nanocomposites were prepared by a solution blending method, and the effect of HRG loading on the electrical, mechanical, and thermal properties of the materials was studied. PMMA-HRG nanocomposites achieved a percolation threshold of 0.37 vol.% (0.039 S/m) and a maximum electrical conductivity as high as 85 S/m at a loading of 2.7 vol....

article

Clean and effective catalytic reduction of graphene oxide using atomic hydrogen spillover on Pt/γ-Al2O3 catalyst

Thanh Truong Dang, Viet Hung Pham, Bao Khanh Vu, Seung Hyun Hur, more

Materials Letters > 2012 > 86 > Complete > 161-164

We report a clean and eco-friendly method to prepare reduced graphene oxide (RGO) using atomic hydrogen. Pt/γ-Al ₂ O ₃ was used as a catalyst for the dissociation of H ₂ molecules to form atomic hydrogen, which served as a strong reducing agent for the reduction of graphene oxide (GO). The resulting RGO exhibited a high C/O ratio (∼8.6) and high electrical conductivity (∼4,420S/m)...

article

Influence of TiO2 dimension and graphene oxide content on the self-cleaning activity of methylene blue-stained photocatalytic films

Hyunran Yun, Thuy-Duong Nguyen-Phan, Viet Hung Pham, Hyukmin Kweon, more

Materials Research Bulletin > 2012 > 47 > 10 > 2988-2993

In the present study, TiO ₂ and graphene oxide (GO)/TiO ₂ composite films were simply fabricated by hot-plate spray coating technique. The influences of TiO ₂ dimension and GO content on the self-cleaning activity of methylene blue (MB)-stained films were investigated. The matrix of anatase TiO ₂ quasi-cubic and octahedral particles in diameter of 6–9nm (ST film) degraded...

article

Superior dispersion of highly reduced graphene oxide in N,N-dimethylformamide

Thanh Truong Dang, Viet Hung Pham, Seung Hyun Hur, Eui Jung Kim, more

Journal of Colloid And Interface Science > 2012 > 376 > 1 > 91-96

Here, we report the effect of temperature on the extent of hydrazine reduction of graphene oxide in N,N-dimethylformamide (DMF)/water (80/20 v/v) and the dispersibility of the resultant graphene in DMF. The highly reduced graphene oxide (HRG) had a high C/O ratio and good dispersibility in DMF. The good dispersibility of HRGs is due to the solvation effect of DMF on graphene sheets during the hydrazine...

article

Performance enhancement of Li-ion batteries by the addition of metal oxides (CuO, Co3O4)/solvothermally reduced graphene oxide composites

Kwang-Hyun Kim, Dong-Won Jung, Viet Hung Pham, Jin Suk Chung, more

Electrochimica Acta > 2012 > 69 > Complete > 358-363

Solvothermally reduced graphene oxide (STRG) that was synthesized using N-methyl-2-pyrrolidone (NMP) solvent was first employed as an conducting additive up to 15wt% to commercial graphite anodic material. Due to numerous functional groups on the surface of the STRG, the reversible capacity decreased as the amount of STRG in the anode increased. To overcome this disadvantage, nanosized metal oxides...

article

Reduced graphene oxide–titanate hybrids: Morphologic evolution by alkali-solvothermal treatment and applications in water purification

Thuy-Duong Nguyen-Phan, Viet Hung Pham, Eui Jung Kim, Eun-Suok Oh, more

Applied Surface Science > 2012 > 258 > 10 > 4551-4557

The reduced graphene oxide–titanate (RGO–Ti) hybrids were fabricated by incorporating spherical TiO ₂ nanoparticles with graphene oxide (GO) layers in aqueous NaOH solution following by the solvothermal treatment. The morphologic evolution of RGO–Ti hybrid by varying alkali-solvothermal temperatures has been first investigated. The titanate nanosheets peeled off, folded and scrolled into tubular...

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INFONA - science communication portal

Search results for: Viet Hung Pham

Growth in children infected with HIV receiving anti‐retroviral therapy in Vietnam

Persistence Probability of Random Weyl Polynomial

Hydrogenated TiO2@reduced graphene oxide sandwich-like nanosheets for high voltage supercapacitor applications

Institutional trading before dividend reduction announcements

Clinical characteristics of pediatric HIV-1 patients treated with first-line antiretroviral therapy in Vietnam: a nested case–control study

Asymptotic formula for the tail of the maximum of smooth stationary Gaussian fields on non locally convex sets

Effect of reduced graphene oxide functionalization by sulfanilic acid on the mechanical properties of poly(styrene‐co‐acrylonitrile)/reduced graphene oxide composites

Photocatalytic performance of Sn-doped TiO2/reduced graphene oxide composite materials

Synthesis of epoxy encapsulated organoclay nanocomposite latex via phase inversion emulsification and its gas barrier property

Effects of the alkylamine functionalization of graphene oxide on the properties of polystyrene nanocomposites

Liquid phase co-exfoliated MoS2–graphene composites as anode materials for lithium ion batteries

Role of macroporosity in macro-mesoporous red mud catalysts for slurry-phase hydrocracking of vacuum residue

Adsorption of pharmaceuticals onto trimethylsilylated mesoporous SBA-15

On the rate of convergence for central limit theorems of sojourn times of Gaussian fields

A one pot solution blending method for highly conductive poly (methyl methacrylate)-highly reduced graphene nanocomposites

Clean and effective catalytic reduction of graphene oxide using atomic hydrogen spillover on Pt/γ-Al2O3 catalyst

Influence of TiO2 dimension and graphene oxide content on the self-cleaning activity of methylene blue-stained photocatalytic films

Superior dispersion of highly reduced graphene oxide in N,N-dimethylformamide

Performance enhancement of Li-ion batteries by the addition of metal oxides (CuO, Co3O4)/solvothermally reduced graphene oxide composites

Reduced graphene oxide–titanate hybrids: Morphologic evolution by alkali-solvothermal treatment and applications in water purification

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