Investigation of thermal property of spark plasma sintered Ti-Zr-Ta shape memory alloys

This study is designed to investigate the effects of ternary Ta additions on the thermal properties of spark plasma sintered (SPSed) novel Ti-Zr based SMAs for high temperature applications. The SPSed Ti-Zr/Ta specimens were characterized for their microstructural and crystallographic features using scanning electron microscopy (SEM) incorporated with Energy Dispersive X-ray Spectroscopy (EDS), and X-ray powder diffractometry (XRD). Thermal property measurements were conducted using the Laser Flash technique to obtain the thermal diffusivity behaviour, while the phase transformation properties were determined by the differential scanning calorimetry (DSC). The presence of both alpha martensite, and beta structures were revealed by the SEM/EDX and XRD respectively. High thermal diffusivity values were obtained, and they show an increasing trend with temperature. The DSC measurement revealed high reversible martensitic transformation (above 200 deg Celcius) for all the alloys, a two-stage phase transformation in the binary alloy, and a single-phase transformation event in the ternary alloys. A downward parabolic gradient of the specific heat and thermal conductivity with respect to temperature was recorded in the alloys, thus revealing an interaction between phonon-mediated and electron-mediated thermal transport processes. Two-stage phase transformations, noticed in the binary alloy indicate the reversible transformation events of alpha-Ti and alpha-Zr phases at different te...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research

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Abstract There is benefit, risk and cost in all that we do, but when it comes to food, we expect that it will benefit our health, be available, safe to eat and affordable. But as climate change and demographic shifts through displacement and ageing gather momentum, the emphases on each of benefit, risk and cost will alter. That we are ecological beings whose health and wellbeing are ecosystem-dependent, must now be the underpinning framework for risk management. Loss of natural environment and biodiversity represents reduced nutritional and health resilience, which will need to be factored in to risk assessment an...
Source: Asia Pacific Journal of Clinical Nutrition - Category: Nutrition Authors: Tags: Asia Pac J Clin Nutr Source Type: research
This article reviews emerging technologies in retinal imaging, including their scientific background, clinical implications and future directions. Recent findings Fluorescence lifetime imaging ophthalmoscopy is a technology that will reveal biochemical and metabolic changes of the retina at the cellular level. Optical coherence tomography is evolving exponentially toward higher resolution, faster speed, increased portability and more cost effective. Adaptive optics scanning laser ophthalmoscopy fluorescein angiography will provide unprecedented detail of the retinal vasculature down to the level of capillaries, enabling...
Source: Current Opinion in Ophthalmology - Category: Opthalmology Tags: TRANSLATIONAL RESEARCH: Edited by Jason Hsu and Sunir J. Garg Source Type: research
Conclusion: Extreme dipping pattern is a BP phenotype highly frequent in the general population largely consisting of middle-aged individuals without prevalent cardiovascular disease. In this population, the extreme dipping pattern is not associated with an increased risk of cardiac HMOD, which suggests that the mechanisms invoked for the potential adverse cardiovascular effects of this condition (i.e. nocturnal hypoxemia, low-grade myocardial inflammation, coronary hypoperfusion, sympathetic activation at early morning, etc.) are not operative.
Source: Journal of Hypertension - Category: Cardiology Tags: ORIGINAL PAPERS: Organ damage Source Type: research
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Source: Critical Care and Resuscitation - Category: Intensive Care Tags: Crit Care Resusc Source Type: research
AbstractObjectivesPrevious studies have shown that split-bolus protocols in virtual non-contrast (VNC) reconstructions of dual-energy computed tomography (DE-CT) significantly decrease radiation dose in patients with urinary stone disease. To evaluate the impact on kidney stone detection rate of stone composition, size, tube voltage, and iodine concentration for VNC reconstructions of DE-CT.MethodsIn this prospective study, 16 kidney stones of different sizes (1.2 –4.5 mm) and compositions (struvite, cystine, whewellite, brushite) were placed within a kidney phantom. Seventy-two scans with nine different iodine ...
Source: European Radiology - Category: Radiology Source Type: research
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Source: SafetyLit - Category: International Medicine & Public Health Tags: Age: Elder Adults Source Type: news
Exposure to low ozone concentrations is used in medicine as an adjuvant/complementary treatment for a variety of diseases. The therapeutic potential of low ozone concentrations relies on their capability to increase the nuclear translocation of the Nuclear factor erythroid 2-related factor 2 (Nrf2), thus inducing the transcription of Antioxidant Response Elements (ARE)-driven genes and, through a cascade of events, a general cytoprotective response. However, based on the controversial role of Nrf2 in cancer initiation, progression and resistance to therapies, possible negative effects of ozone therapy may be hypothesised i...
Source: European Journal of Histochemistry - Category: Biomedical Science Source Type: research
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Source: Medscape Medical News Headlines - Category: Consumer Health News Tags: Psychiatry News Source Type: news
Source: Food and Drug Adminstration (FDA): CDRHNew - Category: Medical Devices Authors: Source Type: news
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Source: Brain Injury - Category: Neurology Tags: Brain Inj Source Type: research
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