The demand for advanced Al-based alloys with tailored structural and magnetic properties has intensified for applications requiring a high thermal stability and performance under challenging conditions. This study investigated the phase evolution, magnetic properties, thermal stability, and microstructural changes in the Al-based alloys AlFeNb and AlFeNbMn, synthesized via mechanical alloying (MA), using stearic acid as a process control agent. The X-ray diffraction results indicated that AlFeNb achieved a β-phase solid solution with 13-14 nm crystallite sizes after 5 h of milling, reaching an amorphous state after 10 h.
View Article and Find Full Text PDFPurpose: is a commensal bacteria species that can cause various illnesses, from mild skin infections to severe diseases, such as bacteremia. The distribution and antimicrobial resistance (AMR) pattern of varies by population, time, geographic location, and hospital wards. In this study, we elucidated the epidemiology and AMR patterns of isolated from a general hospital in Vietnam.
View Article and Find Full Text PDFIn the present study, the thermal stability and crystallization behavior of mechanical alloyed metallic glassy AlFeTi, AlFeNi, and AlFeCu were investigated. The microstructure of the milled powders was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and differential scanning calorimetry (DSC). The results showed remarkable distinction in thermal stability of the alloys by varying only two atomic percentages of transition elements.
View Article and Find Full Text PDFJ Nanosci Nanotechnol
April 2021
The present work is focused on the fabrication and the investigation of microstructures of copperbased TiC nanocomposites produced by mechanical milling in a high energy planetary ball mill. TiH₂, carbon and copper powders were used as starting materials in which reaction between carbon and TiH₂ occurs to form TiC nanoparticles. The mixture powders of Cu-TiH₂-C were milled for 12 h at 450 rpm in Argon gas.
View Article and Find Full Text PDFJ Nanosci Nanotechnol
April 2021
In this work, a mixture of mill scale with 5 wt% molasses as binder was pressed under pressure of 200 MPa to prepare briquettes. The reduction process was performed at the temperature of 1000, 1050, 1100, 1150 and 1200 °C in the bed of A3 fine coal as the reductant. The degree of reduction was evaluated at time duration of 15, 30, 45, 60, 90 and 150 minutes, after the furnace temperature reached the predetermined reduction temperature.
View Article and Find Full Text PDFBackground: Nasopharyngeal carcinoma (NPC) is a rare epithelial carcinoma arising from the nasopharyngeal region. The pathogenesis of NPC is linked to Epstein-Barr virus (EBV) infection, although genetics and lifestyle factors appears to be also implicated. NKG2D is an immunoreceptor expressed by NK and T-cell subsets that recognizes MICA protein and other ligands on tumor cells.
View Article and Find Full Text PDFDioxins have been suspected to be potential substances causing endocrine disruptions in humans. We are conducting the research in one of three dioxin exposure areas (hotspots) in Vietnam. We previously reported that the salivary dehydroepiandrosterone (DHEA) level decreased in 3-year-old Vietnamese children and that it was significantly inversely correlated with polychlorinated dibenzodioxin/dibenzofuran levels in their mother's breast milk.
View Article and Find Full Text PDFScope: Resveratrol is a natural occurring polyphenol with several health promoting activities, including anticancer potential. Here, we analyzed the cytotoxic effects of resveratrol against malignant cells characterized by aberrant activation of the Janus kinase 2 (JAK2).
Methods And Results: Cell-cycle analysis, proliferation, apoptosis, and Western blotting assays were performed to study the effect of resveratrol on malignant cells exhibiting an excessive activation of the JAK2 pathway secondary to the JAK2(V617F) mutation.
Objective: Nearly 40 years after Agent Orange was last sprayed, we conducted a cross-sectional study to evaluate the impact of dioxin exposure on salivary hormones in Vietnamese primiparae. Our previous studies found higher levels of salivary cortisol and cortisone in one of the most highly dioxin-contaminated areas, known as a "hot-spot", than in a non-exposed area. As a result, we suggested that further research with a larger number of participants would be needed to confirm whether dioxin affects steroid hormone levels in Vietnamese primiparae.
View Article and Find Full Text PDFIn this work, we explore the use of methods that allow a significant acceleration of genetic analysis within microchips fabricated from low thermal conductivity materials such as glass or polymers. Although these materials are highly suitable for integrating a number of genetic analysis techniques onto lab-on-a-chip devices, their low thermal conductivity limits the rate at which heat can be transferred and hence lowers the speed of thermal cycling. However, short thermal cycling times are the key to bringing PCR to clinical point-of-care applications.
View Article and Find Full Text PDFMicrovalves are key in realizing portable miniaturized diagnostic platforms. We present a scalable microvalve that integrates well with standard lab on a chip (LOC) implementations, yet which requires essentially no external infrastructure for its operation. This electrically controlled, phase-change microvalve is used to integrate genetic amplification and analysis via capillary electrophoresis--the basis of many diagnostics.
View Article and Find Full Text PDFThermochromic liquid crystals (TLCs) are used to explore the temperature transients during thermal cycling for microchip-based polymerase chain reaction (PCR). By analyzing the reflected spectra of the TLCs over time, temperature vs. time trajectories were extracted and overshoots/undershoots were estimated.
View Article and Find Full Text PDFWe present an inexpensive, portable and integrated microfluidic instrument that is optimized to perform genetic amplification and analysis on a single sample. Biochemical reactions and analytical separations for genetic analysis are performed within tri-layered glass-PDMS microchips. The microchip itself consists of integrated pneumatically-actuated valves and pumps for fluid handling, a thin-film resistive element that acts simultaneously as a heater and a temperature sensor, and channels for capillary electrophoresis (CE).
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