Results 91 to 100 of about 91,243 (286)

Band Edge Reorganization via Symmetry Constraints in Covalent Bonding Heterojunctions Boosts Photocatalytic Metronidazole Degradation

open access: yesRare Metals, EarlyView.
ABSTRACT The covalent bonds at heterojunction interfaces enable more efficient charge carrier separation than traditional weakly coupled heterojunctions, with enhanced photocatalytic performance for organic wastewater purification. The interfacial covalent bonds drive energy band reorganization, rendering the conventional independent band edge ...
Jing‐Yu Ren   +5 more
wiley   +1 more source

Electronic Modulation of Cu Sites via Iron Incorporation in Cu5FeS4 Bimetallic Sulfide for High‐Efficiency Oxygen Reduction Reaction

open access: yesRare Metals, EarlyView.
ABSTRACT The sluggish kinetics of the oxygen reduction reaction (ORR) necessitate developing oxygen electrodes with enhanced electrocatalytic activity for practical zinc–air battery applications. In this study, an iron‐doped copper sulfide electrocatalyst (CuFeNS‐PNC) anchored on metal–organic framework‐derived carbon substrates was designed, featuring
Taichong Chitboonyakasem   +4 more
wiley   +1 more source

同步协作信息检索模型及其机制研究 [PDF]

open access: yes, 2009
通过分析当前用户协作信息检索的相关理论和系统实践,总结其中存在的一些问题,确定用户同步协作检索中要解决的三个关键问题:检索任务的分配、群组查询历史的重用和协作感知,提出一个用户同步协作信息检索模型 ...
刘兰, 徐树维, 齐惠颖
core  

重庆留守小学生情绪调节困难与校园人际关系的相关性研究

open access: yes教育研究, 2019
本研究以重庆市两个区县农村小学4-6年级的留守小学生为研究对象,以小学生情绪调节困难量表、师生关系量表、同伴关系量表为研究工具,探讨留守小学生的情绪调节困难与校园人际关系的相关性问题,得到3个结论:1.留守小学生情绪调节能力一般,有待进一步提升;留守小学生师生关系中等偏上,同伴关系一般。2.留守小学生情绪调节困难、师生关系存在显著的性别差异;同伴关系存在显著的性别差异,在年级上差异不明显。3.情绪调节能力的提高可以减少与教师的冲突和维持良好的同伴关系,良好的师生关系和同伴关系也能促进情绪调节能力的提高。
丹 贺, 永春 万
semanticscholar   +1 more source

Fermi Surface Structure Revealed by Quantum Oscillations in Half‐Heusler Semimetal LuAuSn

open access: yesRare Metals, EarlyView.
ABSTRACT The Fermi surface structure in the half‐Heusler semimetallic compound LuAuSn was systematically investigated using quantum oscillation studies of high‐quality single crystals and first‐principles calculations. Clear bulk quantum oscillation signals were observed for multiple complementary physical properties, including magnetization, Hall ...
Yue Lu   +12 more
wiley   +1 more source

The distribution and palaeoenvironment meaning of carbon, sulfur, and biogenic silica in the sediments of the western arctic ocean [PDF]

open access: yes, 2013
北极环境变化与系统内生物地球化学过程有密切联系,生源要素的变化趋势在一定程度上记录了环境的变化。这种驱动与响应之间的信息被保留到沉积物中,以各种地球化学参数的沉积记录表现出来。 本研究是利用中国首次、第二次北极科学考察所采集的西北冰洋楚科奇海及邻近海域39个表层沉积物样品、12个短岩芯和2个长岩芯沉积物样品为分析对象,测定了其中的总碳、总硫、有机碳、无机碳和生源硅等生源要素,通过参考前人研究成果,如沉积物颜色、粒径等特征,并结合西北冰洋海域的物质来源、环境状况及其演变趋势的分析 ...
彭建平
core  

Dual‐Stage Heat Treatment for Enhanced Hydrogen Storage Properties of Mg−Ni−Y Alloys

open access: yesRare Metals, EarlyView.
ABSTRACT Mg−Ni−Y alloy is considered to be one of the most promising hydrogen storage materials, but its high dehydrogenation energy barrier hinders its practical application. A dual‐stage heat treatment (490°C × 4 h + 550°C × 4 h) is applied to optimize the microstructure and hydrogen storage performance of a vacuum‐melted Mg94Ni3Y3 alloy.
You Lv   +6 more
wiley   +1 more source

花岗岩崩岗不同层次土壤抗冲性及其影响因素

open access: yesShuitu Baochi Xuebao, 2017
针对湖北通城花岗岩崩岗区发育的淋溶层(A层)、淀积层(B层)、过渡层(BC层)以及母质层(C层),采用不同坡度(8.8%,17.6%,26.8%,36.4%,46.6%)和不同流量(0.2,1.0 L/s)相结合的室内放水冲刷试验,分析崩岗各层次土壤的抗冲性指数,初步探讨花岗岩崩岗不同坡度及各层次土壤主要理化性质对抗冲性的影响。结果表明:⑴湖北通城县崩岗土壤A层、B层、BC层以及C层的理化性质存在较大差异。⑵当流量一定时,随着坡度的增大,土壤的抗冲性指数均表现为减小的趋势;当坡度一定时 ...
徐加盼   +5 more
doaj  

The Research of Global Stock Markets’ Complex Networks in the Time Slot Chosen by the PCA Method [PDF]

open access: yes, 2016
全球股票市场组成了一个关系交错的复杂网络系统,在全球一体化的经济背景下,网络的内部结构关系越来越紧密。如今,发达国家的经济增长乏力,新兴国家增速放缓,经济硬着陆的风险仍在,整体经济形势不容乐观,危机的脚步似乎越来越近。在这样的背景之下,通过对股票市场网络结构的研究,发现网络中的关键市场和关键联系,监管者便可以通过对这些关键结构实施重点的风险监控,投资者也可以关注这些关键结构的变化做出投资决策。 复杂网络作为一种对股票市场结构研究的方法,在其运用中,时间区间的不同将使网络呈现出不同的结构形态 ...
刘婷
core  

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