Publications by authors named "Thanh Vuong"

Commercial SSZ-13 zeolite with different n(Si)/n(Al) ratios and from different suppliers were subjected to a post-synthetic treatment in order to create mesopores of up to 15 nm. Furthermore, the materials were modified with copper ions and thoroughly physico-chemically characterized. The modified textural properties varied the nature of copper species, and thus, activity in the selective catalytic reduction of NO with ammonia (NH-SCR-DeNO).

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Reverse water-gas shift (RWGS) reaction has attracted much attention as a potential approach for CO valorization via the production of synthesis gas, especially over Fe-modified supported Cu catalysts on CeO. However, most studies have focused solely on investigating the RWGS reaction over catalysts with high Cu and Fe loadings, thus leading to an increase in the complexity of the catalytic system and, hence, preventing the gain of any reliable information about the nature of the active sites and reaction mechanism. In this work, a CeO-supported single-atom Cu catalyst modified with iron was synthesized and evaluated for the RWGS reaction.

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Cementation in construction materials primarily relies on the aqueous precipitation of minerals such as carbonates and silicates. The kinetics of nucleation and growth play a critical role in the development of strength and durability, yet our understanding of the kinetic controls governing phase formation and porosity reduction in cements remains limited. In this study, we synthesized bisphosphonate molecules with varying alkyl chain lengths and functional groups to investigate their impact on calcium carbonate precipitation.

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Nonlinear optical responses in second harmonic generation (SHG) of van der Waals heterobilayers, Janus MoSSe/MoS, are theoretically optimized as a function of strain and stacking order by adopting an exchange-correlation hybrid functional and a real-time approach in first-principles calculation. We find that the calculated nonlinear susceptibility, χ, in AA stacking (550 pm/V) becomes three times as large as AB stacking (170 pm/V) due to the broken inversion symmetry in the AA stacking. The present theoretical prediction is compared with the observed SHG spectra of Janus MoSSe/MoS heterobilayers, in which the peak SHG intensity of AA stacking becomes four times as large as AB stacking.

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Article Synopsis
  • A study by Giang et al. in 2019 found a high congenital heart disease (CHD) birth prevalence rate of 20.09/1000 births in Da Nang City and nearby provinces, notably higher than previous reports.
  • Three pediatric cardiology physicians reclassified this data into 27 CHD subgroups, revealing a re-evaluated prevalence rate of 14.71/1000 births, which is still significantly higher than the Asian LMIC average of 9.34/1000 births.
  • The researchers suggest that environmental contaminants, particularly dioxin TCDD from Agent Orange used during the Vietnam War, may contribute to the increased CHD rates, urging further soil and sediment testing in affected areas
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Mn-doped semiconductor nanocrystals with tuned location and concentration of Mn ions can yield diverse coupling regimes, which can highly influence their optical properties such as emission wavelength and photoluminescence (PL) lifetime. However, investigation on the relationship between the Mn concentration and the optical properties is still challenging because of the complex interactions of Mn ions and the host and between the Mn ions. Here, atomically flat ZnS nanoplatelets (NPLs) with uniform thickness were chosen as matrixes for Mn doping.

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Pemphigus is a rare, devastating, bullous autoimmune disease that damages the skin and mucous membranes, and has high morbidity and mortality. Studies have shown associations of pemphigus vulgaris (PV) and pemphigus foliaceus (PF) with human leukocyte antigen (HLA) class II polymorphisms.This study examined the frequency of Major Histocompatibility Complex, Class II, DR Beta 1, a Protein Coding gene (HLA-DRB1) and Major Histocompatibility Complex, Class II, DQ Beta 1 (HLA-DQB1) alleles in Vietnamese PV and PF patients, and the association of these polymorphisms with pemphigus subtypes and disease severity.

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In comparison with the single-bundle technique, double-bundle anterior cruciate ligament (ACL) reconstruction has proven its superiority regarding biomechanical studies and clinical outcomes in both rotational knee stability and anterior translation function. However, the complexity and risk of complications remain a great concern for the orthopaedic surgeon performing double-bundle ACL reconstruction. We present a simplified double-bundle ACL reconstruction by the 3-inside technique with 2 suspension buttons and 1 interference screw.

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Article Synopsis
  • * A study conducted at a hospital in Ho Chi Minh City found that 85% of non-pregnant women aged 18-49 had zinc deficiency, with 37% suffering from severe deficiency.
  • * Factors such as albumin levels, marital status, and pregnancy history were linked to severe zinc deficiency, highlighting the need for increased awareness and preventive measures to address this significant health issue.
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Propane dehydrogenation (PDH) to propene is an important alternative to oil-based cracking processes, to produce this industrially important platform chemical. The commercial PDH technologies utilizing Cr-containing (refs. ) or Pt-containing (refs.

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Single-molecule fluorescence imaging (SMFI) of gas-phase ions has been proposed for "barium tagging," a burgeoning area of research in particle physics to detect individual barium daughter ions. This has potential to significantly enhance the sensitivity of searches for neutrinoless double-beta decay (0νββ) that is obscured by background radiation events. The chemistry required to make such sensitive detection of Ba by SMFI in dry Xe gas at solid interfaces has implications for solid-phase detection methods but has not been demonstrated.

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The impact of formaldehyde (HCHO, formed in vehicle exhaust gases by incomplete combustion of fuel) on the performance of a commercial VO-WO/TiO catalyst in NH-SCR of NO under dry conditions has been analyzed in detail by catalytic tests, in situ FTIR and transient studies using temporal analysis of products (TAP). HCHO reacts preferentially with NH to a formamide (HCONH) surface intermediate. This deprives NH partly from its desired role as a reducing agent in the SCR and diminishes NO conversion and N selectivity.

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Biomimetic flavin organocatalysts oxidize nitromethane to formaldehyde and NO-providing a relatively nontoxic, noncaustic, and inexpensive source for catalytic NO for aerobic TEMPO oxidations of alcohols, diols, and ethers. Alcohols were oxidized to aldehydes or ketones, cyclic ethers to esters, and terminal diols to lactones. In situ trapping of NO and formaldehyde suggest an oxidative Nef process reminiscent of flavoprotein nitroalkane oxidase reactivity, which is achieved by relatively stable 1,10-bridged flavins.

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The controlled electrochemical reduction of carbon dioxide to value added chemicals is an important strategy in terms of renewable energy technologies. Therefore, the development of efficient and stable catalysts in an aqueous environment is of great importance. In this context, we focused on synthesizing and studying a molecular Mn -corrole complex, which is modified on the three meso-positions with polyethylene glycol moieties for direct and selective production of acetic acid from CO .

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Using first-principles calculations, we investigate electromechanical properties of two-dimensional (2D) hexagonal and pentagonal materials as a function of electron and hole dopings, in which 2D materials including graphene, chair-like graphane, table-like graphane, penta-graphene (PG), hydrogenated penta-graphene (HPG), and penta-CN2 are considered. We find that the actuation responses such as actuation strain, stress generated, and work area-density per cycle of the 2D materials in the case of hole doping are substantially larger than those of electron doping. Moreover, the electromechanical properties of the 2D materials can be improved by hydrogenation.

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Using first-principle density functional calculations, we investigate electromechanical properties of two-dimensional MX (M = Mo, W; X = S, Se, Te) monolayers with the 1H and 1T structures as a function of charge doping for both electron and hole doping. We find that by increasing the atomic number, , of X atoms ( < < ), the work density per cycle of the MX monolayers are increased and decreased for the 1H and 1T structures, respectively. On the other hand, the work density per cycle of the WX monolayers are higher than that of the MoX monolayers for both the 1H and 1T structures.

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Hypericin is a photosensitizer expressing high affinity for cancerous cells in vivo. Diagnosis of cancer based on hypericin fluorescence imaging has been successfully assessed in several clinical trials. Our final objective will be to evaluate the potential of hypericin fluorescence imaging to improve the efficacy of cervical cancer diagnosis performed on fixed cell smears obtained from liquid-based cytology.

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