Recently, there has been an increased interest in studying extraordinary optical transmission (EOT) through subwavelength aperture arrays perforated in a metallic film. In this Letter, we report that the transmission of an incident acoustic wave through a one-dimensional acoustic grating can also be drastically enhanced. This extraordinary acoustic transmission (EAT) has been investigated both theoretically and experimentally, showing that the coupling between the diffractive wave and the wave-guide mode plays an important role in EAT. This phenomenon can have potential applications in acoustics and also might provide a better understanding of EOT in optical subwavelength systems.
The incorporation of defects, such as vacancies, into functional materials could substantially tailor their intrinsic properties. Progress in vacancy chemistry has enabled advances in many technological applications, but creating new type of vacancies in existing material system remains a big challenge. We show here that ionized nitrogen plasma can break bonds of iron-carbon-nitrogen-nickel units in nickel-iron Prussian blue analogues, forming unconventional carbon-nitrogen vacancies. We study oxygen evolution reaction on the carbon-nitrogen vacancy-mediated Prussian blue analogues, which exhibit a low overpotential of 283 millivolts at 10 milliamperes per square centimeter in alkali, far exceeding that of original Prussian blue analogues and previously reported oxygen evolution catalysts with vacancies. We ascribe this enhancement to the in-situ generated nickel-iron oxy(hydroxide) active layer during oxygen evolution reaction, where the Fe leaching was significantly suppressed by the unconventional carbon-nitrogen vacancies. This work opens up opportunities for producing vacancy defects in nanomaterials for broad applications.
After instrumented reduction of adult IS, either PLIF or TLIF can provide good clinical and radiological outcomes. With a single cage, TLIF was superior to PLIF in terms of surgical time and blood loss, but these differences may not be clinically relevant.
In
this paper, the graphene oxide (GO) doped transition metal (Cu,
Co, and Ni) complexes of triaminoguanidine (TAG) have been prepared
where the GO serves as the stabilizing agent. The catalytic reactivity
of GO stabilized TAG-M (M = Cu, Co, Ni) energetic composites on thermolysis
of 1,3,5-trinitro-1,3,5-triazinane (RDX) has been investigated by
using DSC/TGA techniques. It has been found that these materials have
strong catalytic effects on decomposition of RDX by decreasing the
apparent activation energy. Meantime, GO would not only stabilize
TAG-M energetic composites but also enhance the thermal stability
of RDX due to its high thermal conductivity. The physical models that
govern the decomposition processes were also studied, and it has been
shown that different reaction processes are accomplished by varying
transition metals or in cooperation with GO. The complex catalyst,
with improved thermal stability, represents a unique class of catalyst
of considerable value for catalytic combustion and safety issue of
solid propellants.
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