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

Recent advancements in natural dye applications: a review

A comprehensive review of techniques for natural fibers as reinforcement in composites: Preparation, processing and characterization.

H2O2 is a valuable, environmentally friendly oxidizing agent with a wide range of uses from the provision of clean water to the synthesis of valuable chemicals. The on-site electrolytic production of H2O2 would bring the chemical to applications beyond its present reach. The successful commercialization of electrochemical H2O2 production requires cathode catalysts with high activity, selectivity, and stability. In this Perspective, we highlight our current understanding of the factors that control the cathode performance. We review the influence of catalyst material, electrolyte, and the structure of the interface at the mesoscopic scale. We provide original theoretical data on the role of the geometry of the active site and its influence on activity and selectivity. We have also conducted a series of original experiments on (i) the effect of pH on H2O2 production on glassy carbon, pure metals, and metal–mercury alloys, and (ii) the influence of cell geometry and mass transport in liquid half-cells in com...

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Toward the Decentralized Electrochemical Production of H2O2: A Focus on the Catalysis

Shifting electrochemical oxygen reduction towards 2e- pathway to hydrogen peroxide (H2O2), instead of the traditional 4e- to water, becomes increasingly important as a green method for H2O2 generation. Here, through a flexible control of oxygen reduction pathways on different transition metal single atom coordination in carbon nanotube, we discovered Fe-C-O as an efficient H2O2 catalyst, with an unprecedented onset of 0.822 V versus reversible hydrogen electrode in 0.1 M KOH to deliver 0.1 mA cm-2 H2O2 current, and a high H2O2 selectivity of above 95% in both alkaline and neutral pH. A wide range tuning of 2e-/4e- ORR pathways was achieved via different metal centers or neighboring metalloid coordination. Density functional theory calculations indicate that the Fe-C-O motifs, in a sharp contrast to the well-known Fe-C-N for 4e-, are responsible for the H2O2 pathway. This iron single atom catalyst demonstrated an effective water disinfection as a representative application.

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Highly selective oxygen reduction to hydrogen peroxide on transition metal single atom coordination.

The global utilization of hydrogen peroxide, a green oxidant that decomposes in water and oxygen, has gone from 0.5 million tonnes per year three decades ago to 4.5 million tonnes per year in 2014, and is still climbing. With the aim of expanding the utilization of this eminent green chemical across different industrial and civil sectors, the production and use of hydrogen peroxide as a green industrial oxidant is reviewed herein to provide an overview of the explosive growth of its industrial use over the last three decades and of the state of the art in its industrial manufacture, with important details of what determines the viability of the direct production from oxygen and hydrogen compared with the traditional auto-oxidation process.

Hydrogen Peroxide: A Key Chemical for Today's Sustainable Development.

The role of natural dyes in the UV protection of fabrics made of vegetable fibres

This study offers a unified perspective into the unexpected solar energy photovoltaic revolution, and its far reaching impact onto both energy generation and electricity markets. Practically relevant aspects, such as those related to the value of solar PV electricity, land consumption, energy return on energy invested, reliability of the technology, the structure of the global PV industry, the cost of Li ion batteries and related market trends are clarified. We identify the main barriers to overcome for solar PV to expand beyond a niche market (say, <10% of a country's power generation), and the related societal benefits with electrification of energy end uses.

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The great solar boom: a global perspective into the far reaching impact of an unexpected energy revolution

Chemical extraction, water retting, microbiological and enzymatic methods were applied on entire nettle stalks and/or unretted decorticated fiber of a selected fiber nettle clone. Morphological and mechanical properties and chemical composition were then determined on fiber samples.The first interesting result concerned the good degree of separation between fibers and shives obtained by mechanical scutching applied on stalks stored for 1 year, probably resulting from natural retting processes occurring during the storage.Microbiological retting (anaerobic plus aerobic bacteria) of entire stalks and/or unretted decorticated fiber produced fibers with a higher quality than water retting.Both enzymes used (Viscozyme ® L and Pectinex® Ultra SP-L), improved fiber quality if EDTA was added. The enzyme vat retting gave good results on both water-retted fibers and unretted decorticated fibers, while the spray enzyme treated fibers usually displayed thicker diameter, lower cellulose content and, for Viscozyme ® L,...

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Lorenzo Albanese

Papers

Hydrogen Peroxide: A Key Chemical for Today's Sustainable Development.

The role of natural dyes in the UV protection of fabrics made of vegetable fibres

The great solar boom: a global perspective into the far reaching impact of an unexpected energy revolution

Effect of different extraction methods on fiber quality of nettle (Urtica dioica L.)

Beer-brewing powered by controlled hydrodynamic cavitation: Theory and real-scale experiments