There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

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

Two organolead halide perovskite nanocrystals, CH3NH3PbBr3 and CH3NH3PbI3, were found to efficiently sensitize TiO2 for visible-light conversion in photoelectrochemical cells. When self-assembled on mesoporous TiO2 films, the nanocrystalline perovskites exhibit strong band-gap absorptions as semiconductors. The CH3NH3PbI3-based photocell with spectral sensitivity of up to 800 nm yielded a solar energy conversion efficiency of 3.8%. The CH3NH3PbBr3-based cell showed a high photovoltage of 0.96 V with an external quantum conversion efficiency of 65%.

Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

Dye-sensitized solar cells (DSCs) offer the possibilities to design solar cells with a large flexibility in shape, color, and transparency. DSC research groups have been established around the worl ...

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Dye-Sensitized Solar Cells

OBJECTIVE: To investigate the chemical constituents from the aerial parts of Hyperricum monogynum. METHOD: Compounds were isolated by various column chromatography and identified by spectral analysis. RESULT: Ten compounds were isolated and identified as quercetin, quercitrin, hyperoside, rutin, (-)-epicatechin, 3,5-dihydroxy-1-methoxy-xanthone, 3,4-O-isopropylidenyl shikimic acid, shikimic acid, daucosterol, and oleanoic acid. CONCLUSION: All compounds were isolated from this plant for the first time.

Chemical constituents of Hyperricum monogynum

Two new triterpene saponins from the aerial parts of Paraquilegia microphylla.

Four new euphane triterpenes, (3 beta)-3-(acetyloxy)eupha-7,25-dien-24-one (1), (3 beta,24R)-3-(acetyloxy)eupha-7,25-dien-24-ol (2), (3 beta,24S)-eupha-7,25-diene-3,24-diol (3), and (3 beta,24R)-eupha-7,25-diene-3,24-diol (4) were isolated from the barks of Broussonetia papyrifera, a tree whose roots, barks, and fruits were used as herbal drugs in China. The structures of 14 were elucidated on the basis of spectroscopic evidence and chemical methods.

Euphane Triterpenes from the Bark of Broussonetia papyrifera

Investigation on Charge Carrier Recombination of Hybrid Organic–Inorganic Perovskites Doped with Aggregation‐Induced Emission Luminogen under High Photon Flux Excitation

Mingkui Wang

Papers

Chemical constituents of Hyperricum monogynum

Two new triterpene saponins from the aerial parts of Paraquilegia microphylla.

Euphane Triterpenes from the Bark of Broussonetia papyrifera

Investigation on Charge Carrier Recombination of Hybrid Organic–Inorganic Perovskites Doped with Aggregation‐Induced Emission Luminogen under High Photon Flux Excitation

2D Materials as Electron Transport Layer for Low‐Temperature Solution‐Processed Perovskite Solar Cells