Results 121 to 130 of about 140,327 (238)

Energia e ambiente num mundo com muita gente [PDF]

, 2009
Muitos dos recursos que exploramos para o nosso dia a dia são finitos, isto é não se renovam (pelo menos à escala de tempo que é a nossa). Por outro lado, a Natureza tem uma capacidade finita para absorver os impactes que as actividades que ...
Pereira, Manuel Collares
core  

A Wood Plasticine With Controlled Phase‐Change Behavior and Malleability for Energy‐Closed‐Loop and Conformally Adaptive Thermal Management

Advanced Science, EarlyView.
A photothermal wood plasticine exhibiting controlled phase‐change behavior and malleable property is developed. The developed wood plasticine can provide all‐day, on‐demand, and low‐loss solar heating for geometrically diverse objects, including thermoelectric generator, human body, and battery, through its controlled crystallization‐melting ...
Jiazuo Zhou, Yifan Liu, Lei Qiao, Yuehe Gu, Taikun Yao, Wenbo Zhang, Fangmiao Wang, Yudong Li, Xinyao Ji, Lingyi Kong, Haiyue Yang, Yao Xiao, Chengyu Wang   +12 more
wiley   +1 more source

High‐Performance Recycling Biobased Photopolymers for 3D Printing

Advanced Science, EarlyView.
By using biobased phenols like eugenol, novel biobased photopolymers containing dissociative phenol‐carbamate bonds are designed for 3D printing. Meanwhile, a “mixed‐monomer assisted recycling” strategy is proposed to recycle the materials. The resulting materials not only achieve high‐performance and excellent chemical recyclability simultaneously ...
Hang Zhou, Yi Tan, Chuanwei Lu, Yanlin Li, Tianyi Tang, Zheng Yang, Ying Li, Xuehan Chen, Jianfeng Yao, Zhengchun Cai, Yuanyuan Jiang, Ping Zhao, Chengguo Liu   +12 more
wiley   +1 more source

Heterointerface‑Enabled Electrocatalysis for Efficient Energy Conversion

Advanced Science, EarlyView.
Functionally distinct A/B materials can be integrated at the nanoscale to create customized heterointerfaces with tunable band alignment and charge redistribution, providing fast electron and ion transport channels as well as cooperative dual active sites.
Liuru Fang, Hsiwen Wu, Hengyue Xu, Jie Zhang   +3 more
wiley   +1 more source

Role of Epoxide Functionalization of Amines for Development of Direct Air Capture Sorbents with High Cyclic Working Capacity at Low Desorption Temperatures

Advanced Science, EarlyView.
Appropriate butylene oxide (BO) functionalization of amines (polyethyleneimine (PEI1200 and PEI300) and tris(2‐aminoethyl)amine (TREN)) enables excellent cyclic working capacities (WCcyclic) at low desorption temperatures (40−70°C). Notably, 0.30BO‐PEI300‐SY and 0.54BO‐TREN‐SY show the highest WCcyclic at 45 and 40°C, respectively.
Joo Yeon Han, Hayoung Jeong, Younghyu Ko, Yohan Cho, Seenu Ravi, Kyu‐Min Ryoum, Hyug Hee Han, Yujin Choi, Chaewon Shin, Jeong Woo Han, Youn‐Sang Bae   +10 more
wiley   +1 more source

Multi‐scale Optimization on Interfacial Evaporative Cooling for Photovoltaic Performance Enhancement

Advanced Science, EarlyView.
This study presents a passive siphon‐driven interfacial evaporative cooling technology for photovoltaics. A multiscale multiphysics model is developed and validated experimentally. Results show that optimizing installation parameters reduces operating temperature by up to 22.3 °C and boosts power efficiency by 8.9%, offering a practical pathway for ...
Fuxiang Li, Haosheng Lin, Zengguang Sui, Yunren Sui, Zhixiong Ding, Wei Wu   +5 more
wiley   +1 more source

Mass‐Transport–Engineered CCM Architecture Employing MPL‐Free Carbon Paper and Graphene‐Coated Ni Foam Channels for High‐Temperature PEM Fuel Cells

Advanced Science, EarlyView.
A CCM‐based architectural strategy is introduced for high‐temperature PEM fuel cells, enabling MPL‐free carbon paper gas diffusion layers via decal‐transfer processing. By co‐engineering the CCM, GDL, and a G‐foam flow field, oxygen transport is enhanced while phosphoric‐acid leakage is suppressed, resulting in high power density and stable operation ...
Seongmin Cho, Songi Oh, Mingyu Kim, Jung Hwa Choi, Sunjae Hwang, Ji‐Hoon Jang, Segeun Jang   +6 more
wiley   +1 more source

ANÁLISE DA CAPACIDADE PRODUTIVA E DOS ÍNDICES DE CONCENTRAÇÃO, DISPERSÃO E VARIAÇÃO DA INDÚSTRIA DE BIODIESEL NO BRASIL [PDF]

O Principal objetivo desse trabalho é analisar a capacidade produtiva brasileira de biodiesel das empresas existentes, em construção e em planejamento, bem como, o nível de concorrência das mesmas através do índice de concentração CR(k), do índice de ...
Bulhoes, Ronaldo, Carminatti, Joao Guilherme De Oliveira, Nicola, Matheus Lazzari   +2 more
core   +1 more source

One‐Dimensional RuIrTe Nanotubes with Amorphous Surface as a Highly Active and Stable Electrocatalyst Toward Oxygen Evolution Reaction in Acidic Media

Advanced Science, EarlyView.
A rational etching‐induced reconstruction strategy is demonstrated to fabricate one‐dimensional RuIrTe ternary nanotubes with a unique amorphous‐crystalline heterostructure. This hierarchical architecture synergistically optimizes mass transport and electronic configurations, delivering record‐breaking performance in proton exchange membrane water ...
Zhi Liang Zhao, Zhe Zhang, Shaoxuan Yang, Jie Zhang, Qi Wang   +4 more
wiley   +1 more source

Environmental Insights and Sustainability Opportunities for Scaled‐Up MXene Production Without Etching

Advanced Science, EarlyView.
Through a systematic and comprehensive analysis of the environmental impacts for the emerging MXene synthesis pathways, this study presents process transformation and optimization opportunities for low‐carbon MXene production from laboratory to industrial scales.
Yushuai Huang, Peng Peng, Maoqiao Xiang, Fen Yue, Jiangyan Wang, Wenwei Liu, Qingshan Zhu   +6 more
wiley   +1 more source