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.

/pdf/graphene-photonics-and-optoelectronics-3ddg6ukzcu.pdf

Graphene photonics and optoelectronics

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

A quantitative theoretical model for the radiative performance of heavily n-doped semiconductors is presented. It embraces the combined effects of valence electrons, free electrons, and polar optical phonons. The model is applied to indium-tin-oxide films and is used to compute integrated luminous, solar, and thermal properties. Optimization of film thickness and electron density can yield single uniform coatings on glass with 78% normal solar transmittance and 20% hemispherical thermal emittance.

Transparent and infrared-reflecting indium-tin-oxide films: quantitative modeling of the optical properties.

Electrochromic film with the general formula: ApBqOxXy wherein: -A is one or more of the elements from the group consisting of Ni, Ir, Cr, V, Mn, Fe, W, Mo, Ti, Co, Ce, Pr and Hf; -B is one or more of the elements from the group consisting of Mg, Ca, Sr, Ba, Nb, Al, Zr, Ta and Si; -O is oxygen; -X is an element from the group consisting of: H, F and N; and the ratio q/p is greater than 0.2 and less than 3.5, x is greater than 0.5(p+q) and less than 5(p+q), and y is equal to or greater than 0 and less than 2x. The film may further comprise an amount of Li, Na or K. The invention further relates to an electrochromic device comprising at least one layer of said electrochromic film.

Electrochromic film and device comprising the same

We present a demonstration of online monitoring of gas-phase photocatalytic reactions. A cotton cloth impregnated with commercial titanium dioxide nanoparticles is used as a photocatalytic filter to clean air contaminated with a model pollutant. A fan forces air through the filter while it is irradiated by UV diodes. The concentration of the air pollutant is measured online by an inexpensive, commercially available semiconductor air quality sensor. The structural parts of the reactor were 3D printed in polylactide bioplastic. We provide all schematics, 3D printed model parts, hardware, firmware, and computer code of the reactor and control units. The device can be used for interactive learning of both gas phase photocatalysis and gas sensing, as well as in student laboratory classes for measuring air pollutants and their photodegradation. The experimental setup can also form the basis for a project work for chemical engineering university students, and it can be employed as a building block for development of other gas phase chemical reaction demonstrations.

https://faculty.missouri.edu/~glaserr/3700s15/Air-3D_ed500604e.pdf

Demonstrating Online Monitoring of Air Pollutant Photodegradation in a 3D Printed Gas-Phase Photocatalysis Reactor

[PEI–SiO2]:[LiTFSI] nanocomposite polymer electrolytes:Ion conduction and optical properties

Polymer electrolytes containing polyethyleneimine and different concentrations of lithium bis(trifluoromethylsulfonyl) imide were investigated by impedance spectroscopy at different temperatures. Two equivalent circuit models were compared for the bulk impedance response. The first one includes a conductive Havriliak–Negami (HN) element which represents ionic conductivity and ion pair relaxation in a single process, and the second model includes a dielectric HN element, which represents ion pair relaxation, in parallel with ion conductivity. Comparison of the two circuit models showed that the quality of the fit was similar and in some cases better for the conductive model. The experimental data follow the Barton–Nakajima–Namikawa relation, which relates the ion conductivity and the parameters of the relaxation. This indicates that ion conductivity and ion pair relaxation are two parts of the same process and should be described by the conductive model.

/pdf/ionic-relaxation-in-polyethyleneimine-lithium-bis-1xw5imlxhf.pdf

Claes-Göran Granqvist

Papers

Transparent and infrared-reflecting indium-tin-oxide films: quantitative modeling of the optical properties.

Electrochromic film and device comprising the same

Demonstrating Online Monitoring of Air Pollutant Photodegradation in a 3D Printed Gas-Phase Photocatalysis Reactor

[PEI–SiO2]:[LiTFSI] nanocomposite polymer electrolytes:Ion conduction and optical properties

Ionic relaxation in polyethyleneimine-lithium bis(trifluoromethylsulfonyl) imide polymer electrolytes