Antiferromagnet (AFM) has currently participated in the spin-orbit torque (SOT) technology due to its great potential to be applied to the field-free SOT switching and to promote the thermal stability of MRAM. However...
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Magnesium-rare earth (Mg-RE) alloys offer exceptional specific strength, presenting significant opportunities for lightweight structural applications, yet require deep understanding for process optimization. This stud...
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Magnesium-rare earth (Mg-RE) alloys offer exceptional specific strength, presenting significant opportunities for lightweight structural applications, yet require deep understanding for process optimization. This study systematically investigates how varying Yttrium (Y) content (x = 1.5, 2.5, 3.5 wt%) interacts with thermomechanical processing (hot-extrusion followed by 200°C aging) to govern microstructural evolution and mechanical properties (at room temperature (RT) and 250°C) in Mg-11Gd-xY-0.5Zr alloys. Comprehensive characterization using scanning electron microscope (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD), and transmission electron microscope (TEM) revealed complex microstructural responses: increasing Y promoted grain refinement but yielded non-monotonic dynamic recrystallization (DRX) behaviour during extrusion and induced significant detrimental coarsening of the β phase morphology at higher concentrations (3.5 wt%). Aging precipitated the crucial nano-scale β′ strengthening phase, while further dynamic precipitation of β′ was observed during high-temperature (HT) deformation. Effective precipitation strengthening in the AGY1.5 alloy (1.5 wt% Y) yielded optimal RT properties, including an ultimate tensile strength (UTS) exceeding 500 MPa. Conversely, 3.5 wt% Y led to inferior strength despite finer grains and higher indicated dislocation density, unequivocally demonstrating the adverse impact of coarse β precipitates. Enhanced ductility and extended work hardening characterized the 250°C behavior across compositions, linked to dynamic precipitation effects and thermally activated non-basal slip systems. Crucially, this work demonstrates that precipitate characteristics—specifically morphology and spatial distribution—act as the dominant factor controlling mechanical performance variations with Y content in this system, overriding contributions from grain size, texture, and dislocation density. These findings provid
Inverse problems frequently occur when boundary conditions/thermal properties of a material are unknown, and are determined from known internal temperature measurements. A direct problem is the opposite of an inverse ...
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We study the thermo-optic coefficient of silicon carbide with different silicon content. We demonstrate a clear trend between the silicon content and the thermo-optic coefficient which measured as high as 1.88×10...
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Laser communication technology has garnered considerable attention in recent times due to its advantageous features such as high security, wide bandwidth, and high transmission rate. Its potential for long-distance at...
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We report a simple, vacuum-compatible fiber attach process for in situ study of grating-coupled photonic devices. The robustness of this technique is demonstrated on grating-coupled waveguides exposed to multiple X-ra...
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ISBN:
(纸本)9798350369311
We report a simple, vacuum-compatible fiber attach process for in situ study of grating-coupled photonic devices. The robustness of this technique is demonstrated on grating-coupled waveguides exposed to multiple X-ray irradiations for aerospace studies.
Polycyclic aromatic hydrocarbons (PAHs) are critical environmental concerns due to their intrinsic toxic aromatic nature and concomitant circumstances that potentially harm the ecological and human health. In this stu...
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Hybrid nucleic acid nanostructures partition architectural and functional roles between ribonucleic acid(RNA)joints and deoxyribonucleic acid(DNA)*** self-assemble from nucleic acid modules through synergistic stabili...
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Hybrid nucleic acid nanostructures partition architectural and functional roles between ribonucleic acid(RNA)joints and deoxyribonucleic acid(DNA)*** self-assemble from nucleic acid modules through synergistic stabilization of marginally stable base pairing interactions within circularly closed ***,we report the development of hybrid nanoshapes that include multiple different RNA modules such as internal loop and three-way junction(3WJ)*** iterative mix-and-match screening approach was used to identify suitable DNA connectors that furnished stable nanoshapes for combinations of different RNA *** resulting complex multicomponent RNA-DNA hybrid nanoshapes were characterized by atomic force microscopy(AFM)*** research provides proof of concept for modular design,assembly and screening of RNA-DNA hybrid nanoshapes as building blocks for complex extended nucleic acid materials with features at the sub-10 nm scale.
As humanity pushes further into the unknown, astronauts will be faced with heightened risks of physiological issues during long-term missions. Bone mass loss seen in astronauts is proportional to the time spent in zer...
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As humanity pushes further into the unknown, astronauts will be faced with heightened risks of physiological issues during long-term missions. Bone mass loss seen in astronauts is proportional to the time spent in zero-gravity, and increases the chance of osteoarthritis (OA), a disease that affects around 240 million people worldwide. OA occurs when the protective cartilage cushioning the joints degrades over time, and interestingly presents itself in women almost twice as much as in men. Knee osteoarthritis (KOA) is the most common form of OA and is used to study its pathogenesis. Several astronaut studies have already shown that prolonged periods of zero-gravity contribute directly to cartilage degradation in various measurable fashions. Others have investigated cartilage tissue behaviour inside artificial biological environments and centrifuges. The next step is to explore minute changes in cartilage tissue in microgravity, such as during a parabolic flight, to generate a deeper molecular and genetic understanding of OA pathogenesis. Flying aboard the Canadian Space Agency's Falcon-20 parabolic aircraft, this experiment evaluated the molecular differences between female and male bioengineered cartilage samples when exposed to microgravity, while also for the first time attempted to explore the role of metabolites (the intermediate products of metabolism) in KOA pathogenesis. Metabolite activity responds to gravitational changes on a per-second basis and thus shows exact variations in cartilage tissue metabolism and degradation over time more accurately than before. Until now, such a focus on metabolites has not been conducted in this context. Sample groups were subject to set parabola quantities to determine the effect of repeated microgravity exposures. Hydraulic systems to promote the transfer of nutrient solution (to maintain sample health) and RNAlater reagent (to freeze the samples' molecular activity in time) were implemented, operated by two mission specia
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