Defect Engineering on Carbon‑Based Catalysts for Electrocatalytic CO2 Reduction

Electrocatalytic carbon dioxide(CO2)reduction(ECR)has become one of the main methods to close the broken carbon cycle and temporarily store renewable energy,but there are still some problems such as poor stability,low activity,and selectivity.While the most promising strategy to improve ECR activity is to develop electrocatalysts with low cost,high activity,and long-term stability.Recently,defective carbon-based nanomaterials have attracted extensive attention due to the unbalanced electron distribution and electronic structural distortion caused by the defects on the carbon materials.Here,the present review mainly summarizes the latest research progress of the construction of the diverse types of defects(intrinsic carbon defects,heteroatom doping defects,metal atomic sites,and edges detects)for carbon materials in ECR,and unveil the structure-activity relationship and its catalytic mechanism.The current challenges and opportunities faced by high-performance carbon materials in ECR are discussed,as well as possible future solutions.It can be believed that this review can provide some inspiration for the future of development of high-performance ECR catalysts.     

便携式傅里叶变换红外光谱仪在大气温室气体观测中的应用进展

大气温室气体柱浓度地基遥感观测是碳监测卫星验证和校正的有效手段,目前主要依赖于昂贵且移动困难的高分辨率傅里叶变换红外光谱仪(120/125 HR).采用便携式较低光谱分辨率(0.5cm-1)傅里叶变换红外光谱仪(EM27/SUN)进行温室气体柱浓度的监测提供了一种新型的便捷手段.EM27/SUN通过自带的太阳跟踪器记录...     

面向绿色制造的快速点磨削磨削液供给参数计算

高速／超高速磨削条件下,砂轮边缘的高速空气带会阻碍磨削液注入磨削区。空气带压力与砂轮速度的平方成正比。快速点磨削是一种新型高速／超高速磨削技术,接触区很小,实际磨削功率低,冷却及散热效果好。在分析了高速／超高速磨削砂轮周围旋转空气带动压力及速度分布特点的基础上,根据热力学原理及快速点磨削特点,分析并建立了磨削液的供给流量和供液速度的理论模型。在此基础上,建立了面向绿色制造的快速点磨削的磨削液喷嘴直径及供液压力的工程计算公式。     

HFC-245fa型喷涂聚氨酯硬泡的研制

利用1,1,1,3,3五-氟丙烷(HFC-245 fa)的环保、安全等优良特性,将其作为喷涂聚氨酯硬泡领域ODS发泡剂的替代品,通过原料的选择和配方的优化,解决了以HFC-245 fa作发泡剂带来的易挥发等技术难点,使HFC-245 fa发泡剂在聚氨酯喷涂领域中得到很好的推广应用。     

供电企业信息化管理综述

分析了供电企业实现信息化管理的必然趋势和目前信息化管理的现状,指出信息化的关键是更新观念、提升管理,在统一规划的基础上,通过分步实施信息化管理,带动供电企业实现持续发展。     

渗透汽化在醇/水分离中的应用

一种新型的膜分离技术即渗透汽化技术逐渐在食品工业中得到应用.该文简要介绍了渗透汽化原理和渗透汽化分离膜,着重论述了渗透汽化技术在食品工业中醇/水分离方面的应用研究.     

Priority-Based Routing Resource Assignment Considering Crosstalk

Crosstalk has become one of the most critical concerns in very deep sub-micron era. This paper deals with the problem of crosstalk mitigation at both methodological and algorithmic levels. Noting that intermediate operations between global routing and detailed routing are very effective in crosstalk estimation and reduction, the authors propose to incorporate several intermediate steps that are separated in traditional design flow into an integrated routing resource assignment stage, so that the operations could easily cooperate to fully exert their power on crosstalk reduction. An efficient priority-based heuristic algorithm is developed, which works slice by slice. Crosstalk avoidance, and many other aspects that are critical in routing practice including congestion, vias, layer preference, etc., are taken into account. A track reservation strategy is adopted in the algorithm framework to compensate the undesired effects caused by sequential routing. Experimental results on a series of ISPD98 and industrial benchmarks show that the proposed approach is able to reduce capacitive crosstalk by about 70% on average without compromising completion ratio compared with a previously reported graph based algorithm, demonstrating the advantages of the approach.     

Preparation and Application of Biomass-based Sprayable Hydrogels

Hydrogels have three-dimensional network structures that have been widely applied owing to their high water content, excellent biocompatibility, and physicochemical properties. Compared with conventional hydrogels, sprayable hydrogels exhibit excellent temporal and spatial controllability. Biomass materials offer easy accessibility, biocompatibility, biodegradability, and other physicochemical properties that are extensively used in the formation of sprayable hydrogels. In situ formed biomass-ba...     

High Performance of Paper Strength and Energy Savings in OCC Pulp Papermaking via MFC Addition

Fiber screen fractionation of recycled old corrugated container(OCC) pulp and subsequent targeted processing of each fraction can lead to higher fiber quality, more uniform pulp, and increased handsheet strength and surface smoothness. This pilot-scale study evaluates the benefits of fiber fractionation using a pressure screen prior to low consistency(LC) refining. A 0.81-mm smooth holed screen cylinder is utilized, and two refiner plate patterns are adopted(wide 0.99 km/rev BEL and interim 2.01...