다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

Titanium Dioxide Nanomaterials: Synthesis, Properties, Modifications, and Applications

The richness of optical and electronic properties of graphene attracts enormous interest. Graphene has high mobility and optical transparency, in addition to flexibility, robustness and environmental stability. So far, the main focus has been on fundamental physics and electronic devices. However, we believe its true potential lies in photonics and optoelectronics, where the combination of its unique optical and electronic properties can be fully exploited, even in the absence of a bandgap, and the linear dispersion of the Dirac electrons enables ultrawideband tunability. The rise of graphene in photonics and optoelectronics is shown by several recent results, ranging from solar cells and light-emitting devices to touch screens, photodetectors and ultrafast lasers. Here we review the state-of-the-art in this emerging field.

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Graphene photonics and optoelectronics

Silver nanoparticles as antimicrobial agent: a case study on E. coli as a model for Gram-negative bacteria

Coalescence growth of particles is described as a sequence of binary events, where at each step the change of volume is a random fraction of the volume after coalescence. The model predicts that the logarithm of the particle size should have a Gaussian distribution. This is corroborated by experimental data for inert gas evaporated particles, islands in discontinuous films and supported metal catalysts.

https://hal.archives-ouvertes.fr/jpa-00217069/document

Size distributions for ultrafine metal particles

We briefly address Landauer’s Principle and some related issues in thermal demons. We show that an error-free Turing computer works in the zero-entropy limit, which proves Landauer’s derivation incorrect. To have a physical logic gate, memory or information-engine, a few essential components necessary for the operation of these devices are often neglected, such as various aspects of control, damping and the fluctuation–dissipation theorem. We also point out that bit erasure is typically not needed or used for the functioning of computers or engines (except for secure erasure).

/pdf/critical-remarks-on-landauer-s-principle-of-erasure-qk6rgih415.pdf

Critical Remarks on Landauer's principle of erasure- dissipation Including notes on Maxwell demons and Szilard engines

This chapter addresses various subjects, including some open questions related to energy dissipation, information, and noise, that are relevant for nano- and molecular electronics. The object is to give a brief and coherent presentation of the results of a number of recent studies of ours.

Information, Noise, and Energy Dissipation: : Laws, Limits, and Applications

Different crystal facets of anatase TiO2 are known to have different chemical reactivity; in particular the {001} facets which truncates the bi-tetrahedral anatase morphology are reported to be more reactive than the usually dominant {101} facets. Anatase TiO2 thin films were deposited by reactive DC magnetron sputtering in Ar/O2 atmosphere and were characterized using Rietveld refined grazing incidence X-ray diffraction, atomic force microscopy and UV/Vis spectroscopy. By varying the partial O2 pressure in the deposition chamber, the degree of orientation of the grains in the film could be systematically varied with preferred orientation changing from random upto 39% as determined by March-Dollase method. The orientation of the films is shown to correlate with their reactivity, as measured by photo-degradation of methylene blue in water solutions. The results have implications for fabrication of purposefully chemically reactive thin TiO2 films prepared by sputtering methods.

/pdf/fine-control-of-the-amount-of-preferential-orientation-in-dc-28isc1fwxe.pdf

Fine control of the amount of preferential orientation in DC magnetron sputtered nanocrystalline TiO2 films

The present state and performance of relatively large area transmissive electrochromic devices were reviewed. The largest size prepared has an electrode distance of about 60 cm. The response speed was shown to be limited mainly by the resistance of the transparent conductive coating, though the sheet resistivity available now is fairly low, around 10 {Omega}/sq. The rate of the process in the transmissive device will change from transparent electrode limited to electrolyte limited if the sheet resistivity could be lowered down to less than 1 {Omega}/sq. The present stat of large area transmissive EC devices is summarized. More investigation is necessary for a more accurate understanding of the physical and chemical properties of WO{sub 3} films, especially to provide countermeasures to degradation so that better device performance can be accomplished.

Claes-Göran Granqvist

Papers

Size distributions for ultrafine metal particles

Critical Remarks on Landauer's principle of erasure- dissipation Including notes on Maxwell demons and Szilard engines

Information, Noise, and Energy Dissipation: : Laws, Limits, and Applications

Fine control of the amount of preferential orientation in DC magnetron sputtered nanocrystalline TiO2 films

Electrochromic device design towards large-scale applications