检索结果-南通市图书馆

Oxygen Reduction Reaction Catalyzed by Carbon-Supported Platinum Few-Atom Clusters:Significant Enhancement by Doping of Atomic Cobalt

在线全文

学校读者我要写书评

暂无评论

Research 2020年第1期2020卷 1756-1767页

作者： Bingzhang Lu Qiming Liu Forrest Nichols Rene Mercado David morris Ning Li Peng Zhang Peng Gao Yuan Ping Shaowei Chen Department of Chemistry and Biochemistry University of California1156 High StreetSanta CruzCalifornia 950564USA Department of Chemistry Dalhousie University6274 Coburg RoadHalifaxNova ScotiaCanada B3H 4R2 International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Electron Microscopy Laboratory School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Centre of Quantum Matter Beijing 100871China

Oxygen reduction reaction(ORR)plays an important role in dictating the performance of various electrochemical energy *** platinum nanoparticles have served as the catalysts of choice towards ORR,minimizing the cost of the catalysts by diminishing the platinum nanoparticle size has become a critical route to advancing the technological ***,first-principle calculations show that carbon-supported Pt9 clusters represent the threshold domain size,and the ORR activity can be significantly improved by doping of adjacent cobalt *** is confirmed experimentally,where platinum and cobalt are dispersed in nitrogen-doped carbon nanowires in varied forms,single atoms,few-atom clusters,and nanoparticles,depending on the initial *** sample consisting primarily of Pt_(2~7)clusters doped with atomic Co species exhibits the best mass activity among the series,with a current density of 4:16Amg^(-1)_(Pt)at+0.85V *** that is almost 50 times higher than that of commercial Pt/C.

关键词： platinum Oxygen cobalt

QUICK GETAWAY BOM SUCESSO

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

世界高尔夫 2009年第5期 100-101页

作者： Robbie morris 孙瑾

这个周末的葡萄牙假期和我期待的有些差别。现在正是下午四点,在浓密阴暗的森林中,我们的领队带着一群人抖抖索索地前进着,感觉就像是在演一场恐怖电影。

关键词：葡萄牙度假中心高尔夫球场海岸线假期果岭期待旅行大西洋建筑

在线全文

学校读者我要写书评

暂无评论

Hound-Pup's Big Ears

中学生英语（初中版） 2002年第19期 5-7页

作者： Wilson morris 余昊

Hound-Pup was a very little pup(小狗）,There was one big thing about him,It was his ears,His ears looked very big on a pup that was so little.

关键词：初中英语儿童文学阅读欣赏注释读物

Microbiologically influenced corrosion of cable bolts in underground coal mines:The effect of Acidithiobacillus ferrooxidans

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2021年第3期31卷 357-363页

作者： H.Chen O.Kimyon H.Lamei Ramandi M.Manefield A.H.Kaksonen C.morris A.Crosky S.Saydam School of Materials Science and Engineering UNSW SydneyNSW 2052Australia School of Chemical Engineering UNSW SydneyNSW 2052Australia School of Minerals and Energy Resources Engineering UNSW SydneyNSW 2052Australia CSIRO Land and Water FloreatWA 6014Australia

Reports on corrosion failure of cable bolts,used in mining and civil industries,have been increasing in the past two *** previous studies found that pitting corrosion on the surface of a cable bolt can initiate premature failure of the *** this study,the role of Acidithiobacillus ferrooxidans(***)bacterium in the occurrence of pitting corrosion in cable bolts was *** coupons,made from the wires of cable bolts,were immersed in testing bottles containing groundwater collected from an underground coal mine and a mixture of *** and *** was observed that *** caused pitting corrosion on the surface of cable bolts in the near-neutral *** presence of geomaterials slightly affected the p H of the environment;however,it did not have any significant influence on the corrosion activity of *** study suggests that the common bacterium *** found in many underground environments can be a threat to cable bolts'integrity by creating initiation points for other catastrophic failures such as stress corrosion cracking.

关键词： Cable bolt failure Microbiologically influenced corrosion Acidithiobacillus ferrooxidans

在线全文

学校读者我要写书评

暂无评论

专家系统在图书情报领域应用述评

江苏图书馆学报 1993年第3期 32-34页

作者： A.morris 汪冰中科院文献情报中心

（一）编目作为图书分类描述过程的编目,是专家系统在图书情报工作中应用的重要领域。尽管编目有一套规则控制,如 AACR2,但这项工作不仅要求编目人员决定使用哪些规则,还要求他们决定使用这些规则的顺序以及解释规则,这就要求编目人员... 详细信息

（一）编目作为图书分类描述过程的编目,是专家系统在图书情报工作中应用的重要领域。尽管编目有一套规则控制,如 AACR2,但这项工作不仅要求编目人员决定使用哪些规则,还要求他们决定使用这些规则的顺序以及解释规则,这就要求编目人员具有相当多的专门知识。

关键词：图书编目专家系统

在线全文

学校读者我要写书评

暂无评论

专家系统在联机情报检索中的应用

江苏图书馆学报 1992年第5期 57-60页

作者： A.morris 汪冰中科院文献情报中心

专家系统被定义为能体现人类知识、针对提问给出建议和解释的一组计算机程序,它作为一门学科诞生于二十世纪六十年代后期。然而直到八十年代初日本登上这一舞台,该学科的研究才取得较大进展。

关键词：专家系统联机检索情报检索

7．0T功能MR波谱动态定量检测视觉皮层代谢物对视觉刺激的反应

在线全文

学校读者我要写书评

暂无评论

中华放射学杂志 2012年第10期46卷 875-880页

作者：林艳 morris Peter 吴仁华汕头大学医学院第二附属医院医学影像科 515041 英国诺丁汉大学Sir Peter Mansfield磁共振中心

目的采用超高场强（7．0T）功能MR波谱（fMRS），动态定量检测人脑枕叶视觉皮层代谢物对视觉刺激的反应，探讨人脑在功能活动状态下的能量代谢和神经递质传递的活动情况。方法9名健康志愿者参与本次试验。采用人体7．0TMR扫描仪及16通... 详细信息

目的采用超高场强（7．0T）功能MR波谱（fMRS），动态定量检测人脑枕叶视觉皮层代谢物对视觉刺激的反应，探讨人脑在功能活动状态下的能量代谢和神经递质传递的活动情况。方法9名健康志愿者参与本次试验。采用人体7．0TMR扫描仪及16通道敏感相位编码技术（SENSE）头线圈。首先进行fMRI检查，明确视觉皮层的最大激活区。然后进行。H-MRS检查，ROI为2cm×2cm×2cm，定位于视觉皮层最大激活层面。采用短TE激励回波采集模式（STEAM）序列采集波谱数据，^1H-MRS扫描过程中同时给予受试者与fMRI检查相同的视觉刺激。运用线性拟合模型（LCModel）以水为内标准，分别测定各代谢物在静息期和刺激期的绝对浓度。采用配对设计数据的Wilcoxon符号秩和检验比较各代谢物浓度在刺激前后差异是否有统计学意义。结果视觉刺激状态下，天冬氨酸、谷氨酰胺及甘氨酸的浓度分别为（3．20±0．28）、（2．07±0．10）和（1．65±0．11）μmol／g，较静息期[分别为（3．52±0．28）、（2．25±0．10）和（1．85±0．11）μmol／g]降低，差异有统计学意义（Z值分别为-2．073、-2．073、-2．429，P值均〈0．05）。谷氨酸、谷胱甘肽及乳酸的浓度分别为（11．50±0．11）、（2．45±0．10）和（0．89±0．05）μmol／g，较静息期[分别为（11．28±0．11）、（2．28±0．10）和（0．79±0．05）μmol／g]升高，差异有统计学意义（Z值分别为2．521、2．310、2．016，P值均〈0．05）。葡萄糖浓度[（1．54±0．23）μmol／g]在刺激状态下有降低趋势，但与静息期[（1．78±0．28）μmol／g]比较差异无统计学意义（Z=-1．897，P〉0．05）。结论7．0TfMRS结合LCModel可以定量检测人脑视觉皮层多种代谢物对视觉刺激的反应变化。视觉刺激状态下，激活区乳酸、葡萄糖和天冬氨酸的变化提示脑能量代谢水平的升高；谷氨酸升高伴随谷氨酰胺下降可能提示兴奋性神经递质传递活动的改变；谷胱甘肽升高则提示脑激活状态下抗氧自由基活动增强。

关键词：磁共振波谱学视觉能量代谢

Teacher Frustration and Emotion Regulation in University Language Teaching

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Applied Linguistics 2018年第4期41卷 433-452,551页

作者： Sam morris Jim KING Kanda University of International Studies Japan University of Leicester UK

Few jobs come without irritations, and foreign language instruction comes with its own particular set of frustrations which, when accumulated, can lead to stress and eventual burnout for *** mechanism for reducing such frustrations is that of emotion regulation, the cognitive and behavioral strategies individuals employ to manage the emotions they experience or display. To date,no known studies have reported specifically on the in-class frustration experienced by language teachers, or on how teachers regulate their feelings of frustration. Herein, the authors discuss the experiences of seven EFL teachers at a university in Japan obtained through a series of semistructured interviews, classroom observations and corresponding stimulated-recall sessions. The authors discuss four salient thematic frustrations: student apathy, classroom silence, misbehavior in the context of relational strain, and working conditions. The results reveal that participants applied contextually-dependent emotion regulation behaviors, the success of which was often contingent on the participants’ levels of confidence and control over the stressors. Thus, participants showed more success in managing pervasive low-level stressors such as apathy and silence, and more support would be welcome to aid them to manage more debilitating stressors such as student *** authors offer suggestions for teachers, trainers and institutions on reducing frustration.

关键词： teacher emotions emotion regulation frustration Japan burnout stress

Radial artery access site complications during cardiac procedures,clinical implications and potential solutions: The role of nitric oxide

在线全文

学校读者我要写书评

暂无评论

World Journal of Cardiology 2020年第1期12卷 26-34页

作者： Emma M Coghill Timothy Johnson Russell E morris Ian L Megson Stephen J Leslie Free Radical Research Facility Division of Biomedical SciencesUniversity of the Highlands and IslandsInverness IV23JHUnited Kingdom Johnson Matthey Technology Centre Blount’s CourtSonning CommonReading RG49NHUnited Kingdom School of Chemistry University of St.AndrewsSt Andrews KY169STUnited Kingdom Department of Cardiology NHS HighlandInverness IV23UJUnited Kingdom

Percutaneous coronary intervention for the treatment of coronary artery disease is most commonly performed in the UK through the radial artery,as this is considered to be safer than the femoral ***,despite improvements in technology and techniques,complications can *** most common complication,arterial spasm,can cause intense pain and,in some cases,procedural *** incidence of spasm is dependent on several variables,including operator experience,artery size,and equipment *** antispasmolytic cocktail can be applied to reduce spasm,which usually includes an exogenous nitric oxide(NO)donor(glyceryl trinitrate).NO is an endogenous local vasodilator and therefore is a potential target for anti-spasm ***,systemic administration can result in unwanted side-effects,such as hypotension.A method that adopts local delivery of NO might be *** review article describes the mechanisms involved in radial artery spasm,discusses the advantages and disadvantages of current strategies to reduce spasm,and highlight the potential of NO-loaded nanoporous materials for use in this setting.

关键词： Radial artery Cannulation Spasm Nitric oxide Vasodilation Nanoporous material