This paper proposes an optimization framework for sustainable post-disaster building reconstruction. Based on mathematical optimization, it is intended to provide decision makers with a versatile tool to optimize buil...
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The lifetime of solder joints with electrodeposited Cu has been an issue to date as many electronic devices have shown a high drop impact failure as a result of a sporadic void formation in the intermetallic compound ...
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This article was updated to correct the fourth paragraph in the introduction. Due to errors introduced during the production process Ω appeared as W throughout the paragraph.
This article was updated to correct the fourth paragraph in the introduction. Due to errors introduced during the production process Ω appeared as W throughout the paragraph.
We present the effect of yttrium substitution on superconductivity in the La1−xYxO0.5F0.5BiS2 system. Polycrystalline samples with nominal Y concentrations up to 40% were synthesized and characterized via electrical r...
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We present the effect of yttrium substitution on superconductivity in the La1−xYxO0.5F0.5BiS2 system. Polycrystalline samples with nominal Y concentrations up to 40% were synthesized and characterized via electrical resistivity, magnetic susceptibility, and specific-heat measurements. Y substitution reduces the lattice parameter a and unit-cell volume V, and a correlation between the lattice parameter c, the La-O-La bond angle, and the superconducting critical temperature Tc is observed. The chemical pressure induced by Y substitution for La produces neither the high-Tc superconducting phase nor the structural phase transition seen in LaO0.5F0.5BiS2 under externally applied pressure.
To efficiently assess the mechanical reliability and long-term durability of solid oxide fuel cells (SOFCs) and solid oxide electrolyser cells (SOECs), a suitable creep test method and prediction of the material respo...
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Here we report a ferromagnetic compound Ba9V3Te15 with quasi-one-dimensional (1D) spin chains. It was synthesized at high-temperature and high-pressure conditions and systematically investigated via structural, transp...
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Here we report a ferromagnetic compound Ba9V3Te15 with quasi-one-dimensional (1D) spin chains. It was synthesized at high-temperature and high-pressure conditions and systematically investigated via structural, transport, magnetic and heat capacity measurements. Ba9V3Te15 mainly consists of trimerized face-sharing VTe6 octahedral chains running along the c axis, which are separated by a distance of 10.184(8)Å, thus demonstrating a strong 1D structural character. Ba9V3Te15 is a semiconductor with a band gap ∼128meV and undergoes a ferromagnetic transition with TC∼3.6K. Far above TC, the short-range spin orders due to the intrachain spin coupling have developed, which leads to a negative magnetoresistance effect, the deviation of magnetic susceptibility from the Curie-Weiss law and T1/2 dependence of magnetic heat capacity. Our results reveal that Ba9V3Te15 provides a good opportunity to study the intrinsic properties of a system with quasi-1D ferromagnetic spin chains.
The lattice thermal conductivity (kl) plays a key role in the performance of thermoelectric (TE) materials, where the lower values lead to higher figure of merit values. Two-dimensional (2D) group III-VI monolayers su...
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Electrical resistivity measurements as a function of temperature between 1 and 300 K were performed at various pressures up to 3 GPa on the superconducting layered compounds LnO0.5F0.5BiS2 (Ln = La, Ce). At atmospheri...
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Electrical resistivity measurements as a function of temperature between 1 and 300 K were performed at various pressures up to 3 GPa on the superconducting layered compounds LnO0.5F0.5BiS2 (Ln = La, Ce). At atmospheric pressure, LaO0.5F0.5BiS2 and CeO0.5F0.5BiS2 have superconducting critical temperatures Tc of 3.3 and 2.3 K, respectively. For both compounds, the superconducting critical temperature Tc initially increases, reaches a maximum value of 10.1 K for LaO0.5F0.5BiS2 and 6.7 K for CeO0.5F0.5BiS2, and then gradually decreases with increasing pressure. Both samples also exhibit transient behavior in the region between the lower Tc phase near atmospheric pressure and the higher Tc phase at higher pressures. This region is characterized by a broadening of the superconducting transition, in which Tc and the transition width ΔTc are reversible with increasing and decreasing pressure. There is also an appreciable pressure-induced and hysteretic suppression of semiconducting behavior up to the pressure at which the maximum value of Tc is found. At pressures above the value at which the maximum in Tc occurs, there is a gradual decrease of Tc and further suppression of the semiconducting behavior with pressure, both of which are reversible.
In Brazil, 70 % of the ceramic tile output is at present produced by the dry route. Increasing global environmental concerns and the recognition of the central role played by water have pointed towards encouraging dry...
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In Brazil, 70 % of the ceramic tile output is at present produced by the dry route. Increasing global environmental concerns and the recognition of the central role played by water have pointed towards encouraging dry processes. In this context, the objective of the present work was to study the feasibility of producing high quality porcelain tiles by the dry route. A brief comparison of the dry and wet routes for producing traditional ceramic tiles shows that there are two major differences: the particle sizes obtained by the wet route are usually considerably finer and the different minerals usually mix better with the wet route. The present work studied the relative importance of these differences and looked for raw materials and operational conditions that would result in better performance and glazed porcelain tiles of good quality.
A law previously found for shear moduli of crystalline materials is developed and extended to all elastic moduli in solids and structures. Shear moduli were previously shown to depend only on specific volume. The bulk...
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