Transition-metal-doped Fe2O3 nanoparticles for oxygen evolution reaction

Hematite(α-Fe_2O_3)has been extensively studied as a promising photocatalyst,with the capacity to split water under visible light.To tune its electronic structure and improve the performance for oxygen evolution reaction(OER),high-quality single crystals ofα-Fe_2O_3nanoparticles were synthesized and doped by various transition metals(M=V,Cr,Mn,Zn,Co,Ni,Cu,Nb,Mo,Ti)by a molten-salt flux method.Optical,electronic and catalytic properties of transition-metal-dopedα-Fe_2O_3(TM-dopedα-Fe_2O_3)have been systematically investigated.Cobalt has been identified as the best dopant forα-Fe_2O_3,reducing the OER overpotential by 0.16 V with respect to the undoped.     

WO3 nanoflakes decorated with CuO clusters for enhanced photoelectrochemical water splitting

The low quantum efficiency arising from poor charges transfer and insufficient light absorption is one of the critical challenges toward achieving highly efficient water splitting in photoelectrochemical cells. Three dimensions(3D) structures and heterojunctions have received intensive research interests recent years due to their excellent ability to separate photo-generated charges as well as the enhanced light harvesting property. Herein,3 D Cu O/WO_3 structure was fabricated through a facile solvothermal method followed by chemical bath deposition. The loading of Cu O clusters on WO_3 nanoflake arrays results in a much improved photocurrent density compared with that of pristine WO_3 nanoflake arrays, which reaches 1.8 m A/cm2 at 1.23 V vs. the reversible hydrogen electrode. The electrochemical impedance spectroscopy measurement demonstrates that the improved performance of Cu O/WO_3 electrode is attributed to the accelerated charge transfer kinetics as a result of the desirable band alignment in Cu O/WO_3 heterojunction. This work demonstrates a facile strategy to construct superior WO_3 electrode, which will ultimately allow for efficient storage of solar energy into hydrogen.     

Morphology of tube-like threads related to Limnochares aquatica (L., 1758) (Acariformes: Hydrachnidia: Limnocharidae) in the laboratory

Water mites Limnochares aquatica (L., 1758) during maintenance in the laboratory for a long period of time in constant conditions periodically produced certain whitish flocculent material consisting of long rigid unbranched tube-like threads 1.3 ± 0.3 µm in diameter crossing freely. These threads were studied using light-optical as well as transmission electron microscopical and scanning electron microscopical methods. Microbiological staining was also applied to the threads to exclude their bacterial or fungal origin. The thread wall is built of fine fibrils arranged at different angles to the long axis of threads that is reflected in a certain stratification of the wall. Threads are mostly hollow or may contain electron-dense homogeneous material. No cell components are present in the thread composition. Numerous dermal glands with their small slit-like orifice scattered throughout the mite body surface are thought to produce these threads. Most probably the thread formation is a reaction of mites to stress under laboratory conditions, and this is expected to be a type of defensive reaction.     

铝制沐浴水热回收器的初步设计

对一种新型的铝制沐浴水热回收器进行初步设计。该沐浴水热回收器具有成本低,回收效率高等优点。介绍其工作原理,并以某三口之家为例,计算该热回收器的节能效益。结合沐浴水余热使用情况不合理的现状,讨论其发展前景。     

程善之《残水浒》对水浒空白结构的发现与弥合

民国程善之的《残水浒》作为水浒续作,充分发掘了《水浒传》中众多情节和人物描写方面的空白,像扈三娘的失语、众军官的出路、石碣的来历等,并将自己对国事的关注和因果思想纳入其间,还将现代的女性节义观借程小姐之口进行了阐发。尽管《残水浒》存在诸多缺陷,但作为善读水浒之作,对于水浒的接受则增益不少。     

鄱阳湖(西北水域)水环境现状及其评价

依据“十一五”期间鄱阳湖西北水域设立的8个监测断面动态监测资料,分析了鄱阳湖内该区域水环境的现状,进行了水体水质的分析和评价,并采用综合营养指数法和N/P法,进行了该区域的富营养化评价.结果表明,鄱阳湖(西北部水域)水质整体上达到国标《地表水环境质量标准》(GB3838-2002)中Ⅲ类水标准,仅都昌、蛤蟆石2个监测断...     

密云水库水体富营养化评价与防治

以北京密云水库监测获得的数据为例,按照层次分析法（AHP）的步骤建立适用于密云水库的AHP模型,并结合密云水库的自然地理环境和水文环境,对密云水库的水体富营养化程度进行科学评价。根据评价结果有针对性地对密云水库水体富营养化防治提出建议,为能够有效的遏制水库水体富营养化趋势,制定出合理方案,从而有效的消除污染隐患。     

寻找长江水污染源头的数学方法

把污染微粒的移动看成是随机移动的,从而这种污染物质点系统可以认为由N个串联线性贮积单元组成.在长江干流地区水流量已知的前提下,分析得出了水流速与站点间距离呈正态分布趋势.     

南水北调对汉江中游襄樊市生态环境影响研究

南水北调中线工程实施后。对汉江中下游地区农业灌溉、城市发展、工业生产、航运、水质以及生态环境等产生较大的影响．分析和评价了中线工程对汉江中游襄樊市生态环境的影响,并提出了一些相应对策：进行生态环境安全规划、管理;兴建崔家营、新集水利枢纽工程;加强水污染控制和生态环境保护;加大水土保持力度,发展生态农业、生态林业、生态旅游业．确保生态环境建设的持续性、安全性和高效益性,使南水北凋中线工程调水给襄樊市造成的影响降到最低限度。促进襄樊市社会经济生态环境的可持续发展．     

芦荟毒理作用研究

观察芦荟毒性作用.采用最大给药量及长期毒性测定芦荟毒性作用.芦荟最大给药量为临床成人1 d(4.5 g)口服量的1 400倍,长期毒性实验对血液学、血液生化学及重要组织形态学观察未见病理学改变.芦荟毒性低微长期用药安全.