In this study, GH4169 superalloy was subjected to pre-straining after aging, with pre-strain deformations ranging from 0.2% to 10%. Subsequently, the tensile performance of the alloy was tested at various deformation ...
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Printable, stretchable, and highly conductive metal conductors have emerged as potentially promising interconnects in the field of soft electronics. However, current techniques relying on geometric engineering have be...
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Piezoelectric heterostructures with piezoelectric single crystal bonded to handling substrate have emerged as a notable material platform for radio frequency filtering applications. However, spurious transverse modes ...
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ISBN:
(数字)9798350331462
ISBN:
(纸本)9798350331479
Piezoelectric heterostructures with piezoelectric single crystal bonded to handling substrate have emerged as a notable material platform for radio frequency filtering applications. However, spurious transverse modes resulting from the waveguide effect in the corresponding surface acoustic wave filters curtail the advancement of heterostructures in 5G data transmission. In this work, the
$\text{LiTaO}_{3}/\text{SiO}_{2}/\text{Quartz}$
platform was established to demonstrate several spurious-free SAW resonators and filters. Guided by the finite element methods and slowness analysis, AT-Quartz was selected as the optimal substrate to demonstrate effective suppression of transverse and highest admittance ratio simultaneously. The impact of the structure parameters of heterostructure-based resonators on transverse modes was then established step by step. Resonators and filters with various electrode thickness and materials were fabricated on the
$\text{LiTaO}_{3}/\text{SiO}_{2}/\text{Quartz}$
platform and
$\text{LiTaO}_{3}/\text{SiO}_{2}/\text{Quartz}$
platform for a comparison, among which a typical filter built on AT-Quartz demonstrated a minimum insertion loss as small as 0.89 dB, clean in-band response and excellent out of band performance simultaneously. The prototype highlights the strong potential of the
$\text{LiTaO}_{3}/\text{SiO}_{2}/\text{Quartz}$
acoustic platform for high-quality data transmission.
Water harvesting in arid and semi-arid areas gains increasing attention, and harvesting water from the atmosphere are one of the effective ways to solve this problem. This work provides a structured microfiber coated ...
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In the pursuit of reducing carbon emissions, the integration of renewable energy into society’s energy portfolio plays a crucial role despite challenges tied to their inherent unpredictability and seasonal variations...
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In the pursuit of reducing carbon emissions, the integration of renewable energy into society’s energy portfolio plays a crucial role despite challenges tied to their inherent unpredictability and seasonal variations. Hydrogen, as a mean of storing and transporting renewable energy becomes crucial in addressing these challenges. Notwithstanding its potential, the misalignment of cost-competitive hydrogen production hubs with demand centers calls for a thorough examination of global hydrogen distribution. The versatility of hydrogen transportation (e.g., pipelines, ships, trucks) and various forms like compressed hydrogen, liquid hydrogen, ammonia, and liquid organic hydrogen carriers (LOHC) adds complexity to designing an economically efficient hydrogen supply chain (HSC). Addressing previous scholarly limitations focused on existing technologies, this study advocates for a superstructure-based modeling approach for HSC that includes promising technologies. Through a case study involving a production site in the Middle East and a demand site in Texas, a dedicated HSC superstructure network is formulated, facilitating the identification of cost-effective hydrogen supply pathways using Mixed Integer Linear programming. Ultimately, this effort aims to establish a comprehensive framework to discern the most sustainable and financially viable technologies, identifying the optimal configuration within the HSC.
Medium carbon precipitation hardening ferritic pearlitic (PHFP) grade 34CrMo4 steel was subjected to thermomechanical processing (TMP) comprising of preheating at 1100 C followed by deformation at 1050 C for strains, ...
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The Cr-plated coating inside a gun barrel can effectively improve the barrel’s erosion resistance and thus increase the service ***,due to the cyclic thermal load caused by high-temperature gunpowder,micro-element da...
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The Cr-plated coating inside a gun barrel can effectively improve the barrel’s erosion resistance and thus increase the service ***,due to the cyclic thermal load caused by high-temperature gunpowder,micro-element damage tends to occur within the Cr coating/steel substrate interface,leading to a gradual deterioration in macro-mechanical properties for the material in the related *** order to mimic this cyclic thermal load and,thereby,study the thermal erosion behavior of the Cr coating on the barrel’s inner wall,a laser emitter is utilized in the current *** the help of in-situ tensile test and finite element simulation results,a shear stress distribution law of the Cr coating/steel substrate and a change law of the interface ultimate shear strength are *** have shown that the Cr coating/steel substrate interface’s ultimate shear strength has a significant weakening effect due to increasing *** this study,the interfacial ultimate shear strength decreases from 2.57 GPa(no erosion)to 1.02 GPa(laser power is 160 W).The data from this experiment is employed to establish a Cr coating/steel substrate interface shear damage *** this model is used to predict the flaking process of Cr coating by finite element *** simulation results show that the increase of coating crack spacing and coating thickness will increase the service life of gun barrel.
Al-Zn-Mg alloys with a high amount of Zn (10%) were subjected to high-speed compressive deformation after solution heat treatment, and a slow strain rate tensile test (SSRT) was performed under peak-aging condition. T...
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