检索结果-南通市图书馆

Nanotrains and Self-Assembled Two-Dimensional Arrays Built from Carboranes Linked by Hydrogen Bonding of Dipyridones

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2008年第5期1卷 412-419页

作者： Takashi Sasaki Jason M.Guerrero Ashley D.Leonard James M.tour Department of Chemistry Department of Mechanical Engineering and Materials ScienceRice UniversityMS 2226100 Main St.HoustonTexas 77005USA

The strong hydrogen bonding ability of 2-pyridones were exploited to build nanotrains on *** wheels on axles difunctionalized with 2-pyridone hydrogen bonding units were synthesized and displayed spontaneous formation of linear nanotrains by self-assembly on SiO_(2)or mica *** using atomic force microscopy confi rmed linear formations with lengths up to 5μm and heights within the range of the molecular height of the carborance-tipped axles.

关键词： Nanovehicles nanotrains 2-pyridone hydrogen bonding self-assembly

Personality and Nomophobia: A Moderated Mediation Model of Self-Esteem and Non-Self-Determined Solitude

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Mental Health Promotion 2023年第6期25卷 767-781页

作者： Yuxin Li Fengping Yan Yixin Zhang Man Li tour Liu Faculty of Psychology Tianjin Normal UniversityTianjin300387China Kuichong Middle School Dapeng New DistrictShenzhen518108China Key Research Base of Humanities and Social Sciences of the Ministry of Education Academy of Psychology and BehaviorTianjin Normal UniversityTianjin300387China Tianjin Social Science Laboratory of Students’Mental Development and Learning Tianjin300387China

Background:With the development of information technology,mobile phone has brought much convenience to people’s lives but also caused many negative consequences due to excessive use,such as mobile phone addiction and *** studies have explored the relationship between the Big Five Personality and proble-matic mobile phone use(PMPU).However,they focus on mobile phone *** there is a correlation between nomophobia and mobile phone addiction,the psychological structure is ***,it is neces-sary to explore the relationship between personality and nomophobia and the underlying *** study aims to examine the relationship between Big Five Personality and nomophobia,then construct a moderated mediation model to explore the mediation effect of solitude between Big Five Personality and nomophobia,as well as the moderation effect of ***:Data from 678 college students(351 females,51.77%)were *** completed the Big Five Personality Inventory,Solitude Behavior Scale,Nomophobia Scale and Self-esteem *** were conducted via mediation and moderated ***:Structural equation models revealed that solitude mediated the relationship between neuroticism and *** results showed that neuroticism positively predicted solitude,which in turn positively predicted *** types of solitude partially mediated the relationship between neuroticism and *** also found that self-esteem moderated the association between neuroticism and non-self-determined *** is note-worthy that high self-esteem cannot protect people from negative ***,because of its characteristics,it is easy to receive more social information,and people high in neuroticism are sensitive to negative social *** may cause maladaptive ***:Findings demonstrated a process through which neu-roticism relates to nomophobia and a context under which these relatio

关键词： Personality nomophobia self-esteem solitude structural equation model

College Students’Academic Stressors on Mental Health during the COVID-19 Pandemic: A Comparison between Graduating Students and Non-Graduating Students

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Mental Health Promotion 2022年第4期24卷 603-618页

作者： Jiaqi Yang Yanwen Zhang Peng Li Huan Zhang tour Liu Collaborative Innovation Centre of Assessment toward Basic Education Quality Beijing Normal UniversityBeijing100875China Faculty of Psychology Tianjin Normal UniversityTianjin300387China Key Research Base of Humanities and Social Sciences of the Ministry of Education Academy of Psychology and BehaviorTianjin Normal UniversityTianjin300387China Tianjin Social Science Laboratory of Students’Mental Development and Learning Tianjin300387China

The study aimed to investigate the inﬂuence of academic stressors on mental health and the mediating effect of social support and self-identity among college students and further studied the difference between the graduating students and non-graduating students during the COVID-19 *** 900 college students as sub-jects,used the college students’academic stressors questionnaire,social support questionnaire,self-identity scale and depression anxiety stress scales(DASS-21).The results showed that:(1)The college students’academic stressor posi-tively predicted mental health;(2)Social support and self-identity mediated the relationship;(3)The model also held when academic stressors was replaced by work stressor,but there were differences between the graduating and non-graduating students;(4)The direct effect work stressor on mental health in the graduating group was not signiﬁcant;(5)The non-graduating students’work stressor could not predict mental health through social support.

关键词： COVID-19 work stressor mental health social support self-identity

Effect of anchor and functional groups in functionalized graphene devices

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2013年第2期6卷 138-148页

作者： Elvira Pembroke Gedeng Ruan Alexander Sinitskii David A. Corley Zheng Yan Zhengzong Sun James M. tour Departments of Chemistry Rice University MS 222 6100 Main Street Houston Texas 77005 USA Computer Science Mechanical Engineering and Materials Science and the Smalley Institute for Nanoscale Science and Technology Rice University MS 222 6100 Main Street Houston Texas 77005 USA

The electrical properties of chemically derived graphene and graphene grown by chemical vapor deposition （CVD）, until now, have been inferior to those of mechanically exfoliated graphene. However, because graphene is easier to produce in large quantities through CVD or growth from solid carbon sources, it has a higher potential for use in future electronics applications. Generally, modifications to the pristine lattice structure of graphene tend to adversely affect the electrical properties by shifting the doping level and changing the conductivity and the mobility. Here we show that a small degree of graphene surface functionalization, using diazonium salts with electron-withdrawing and electron-donating functional groups, is sufficient to predominantly induce p-type doping, undiminished mobility, and higher conductivity at the neutrality point. Molecules without a diazonium anchor group desorb easily and do not have a significant effect on the electronic properties of graphene devices. We further demonstrate the variability between identically fabricated pristine devices, thereby underscoring the caution needed when characterizing graphene device behaviors lest conclusions be drawn based on singular extremes.

关键词： chemical vapor deposition graphene diazonium functionali zation neutrality point

Radical Addition of Perfluorinated Alkyl Iodides to Multi- Layered Graphene and Single-Walled Carbon Nanotubes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2010年第2期3卷 138-145页

作者： Christopher E.Hamilton Jay R.Lomeda Zhengzong Sun James M.tour Andrew R.Barron Richard E.Smalley Institute for Nanoscale Science and Technology Department of Chemistry and Department of Mechanical Engineering and Materials ScienceRice UniversityHoustonTexas 77005USA

A simple one-pot reaction that serves to functionalize graphite nanosheets(graphene)and single-walled carbon nanotubes(SWNTs)with perfluorinated alkyl groups is *** radical addition of 1-iodo-1H,1H,2H,2H-perfluorododecane to ortho-dichlorobenzene suspensions of the carbon nanomaterial is initiated by thermal decomposition of benzoyl ***,UV photolysis of 1-iodo-perfluorodecane serves to functionalize the carbon ***-SWNTs,perfluorododecyl-graphene,and perfluorodecyl-graphene are characterized by infrared(IR)and Raman spectroscopy,X-ray photoelectron spectroscopy(XPS),thermogravimetric analysis(TGA),and atomic force microscopy(AFM).The products show enhanced dispersability in CHCl3 as compared to unfunctionalized starting *** advantage of this one-pot functionalization procedure lies in the use of pristine graphite as starting material thereby avoiding the use of harsh oxidizing conditions.

关键词： Nanotube single-walled carbon nanotube graphene radical addition

Evaluation of the Use of Minimax Search in Connect-4—How Does the Minimax Search Algorithm Perform in Connect-4 with Increasing Grid Sizes?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics 2023年第6期14卷 419-427页

作者： Abdoul Wahab touré Department of Mathematics Le Collège Bilingue Dakar Sénégal

As computers have become faster at performing computations over the decades, algorithms to play games have also become more efficient. This research paper seeks to see how the performance of the Minimax search evolves on increasing Connect-4 grid sizes. The objective of this study is to evaluate the effectiveness of the Minimax search algorithm in making optimal moves under different circumstances and to understand how well the algorithm scales. To answer this question we tested and analyzed the algorithm several times on different grid sizes with a time limit to see its performance as the complexity increases, we also looked for the average search depth for each grid size. The obtained results show that despite larger grid sizes, the Minimax search algorithm stays relatively consistent in terms of performance.

关键词： Minimax Alpha-Beta Pruning Connect-4 Algorithms

Predictors of Clostridium difficile infection severity in patients hospitalised in medical intensive care

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第44期19卷 8034-8041页

作者： Nagham Khanafer Abdoulaye touré Cécile Chambrier Martin Cour Marie-Elisabeth Reverdy Laurent Argaud Philippe Vanhems Laboratory of Epidemiology and Public Health CNRS UMR 5558 University of Lyon 69 373 Lyon France Epidemiology and Infection Control Unit Edouard Herriot Hospital Hospices Civils of Lyon 69437 Lyon France Clinical Nutrition Intensive Care Unit Croix Rousse Hospital Hospices Civils of Lyon69317 Lyon France INSERM Unit 1060 INRA 1235 University of Lyon 69921 Oullins France Medical Intensive Care Unit Edouard Herriot Hospital Hospices Civils of Lyon 69437 LyonFrance Microbiology Laboratory Hospices Civils of Lyon 69677 Bron France

AIM:To describe and analyse factors associated with Clostridium difficile infection(CDI)severity in hospitalised medical intensive care unit ***:We performed a retrospective cohort study of 40 patients with CDI in a medical intensive care unit(MICU)at a French university *** include patients hospitalised between January 1,2007and December 31,*** on demographics characteristics,past medical history,CDI description was *** to risk factors associated with CDI within 8 wk before CDI was recorded,including previous hospitalisation,nursing home residency,antibiotics,antisecretory drugs,and surgical ***:All included cases had their first episode of *** mean incidence rate was 12.94 cases/1000admitted patients,and 14.93,8.52,13.24,19.70,and8.31 respectively per 1000 admitted patients annually from 2007 to *** age was 62.9[interquartile range(IQR)55.4-72.40]years,and 13(32.5%)were *** length of MICU stay was 14.0d(IQR 5.0-22.8).In addition to diarrhoea,the clinical symptoms of CDI were fever(>38℃)in 23 patients,abdominal pain in 15 patients,and ileus in 1 *** duration of diarrhoea was 13.0(8.0-19.5)*** addition to diarrhoea,the clinical symptoms of CDI were fever(>38℃)in 23 patients,abdominal pain in 15 patients,and ileus in 1 *** to CDI,38patients(95.0%)were exposed to antibiotics,and 12(30%)received at least 4 ***,3rdgeneration cephalosporins,coamoxiclav and tazocillin were prescribed most frequently(65%,55%,40%and 37.5%,respectively).The majority of cases were hospital-acquired(n=36,90%),with 5 cases(13.9%)being *** patients had severe *** crude mortality rate within 30 d after diagnosis was 40%(n=16),with 9 deaths(9 over 16;56.3%)related to *** our 40 patients,15(37.5%)had severe *** logistic regression showed that male gender[odds ratio(OR):8.45;95%CI:1.06-67.16,P=0.044],rising serum C-reactive protein levels(OR=

关键词： Clostridium difficile Health-care associated infection Hospital-acquired infection Intensive care unit Nosocomial infection Severe Clostridium difficile infection

Sandwich structured graphene-wrapped FeS-graphene nanoribbons with improved cycling stability for lithium ion batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2016年第10期9卷 2904-2911页

作者： Lei Li Caitian Gao Anton Kovalchuk Zhiwei Peng Gedeng Ruan Yang Yang Huilong Fei Qifeng Zhong Yilun Li James M. tour Department of Chemistry Rice University 5100 Main Street Houston Texas 77005 USA School of Physical Science and Technology Lanzhou University Lanzhou 730000 China NanoCarbon Center Rice University 6100 Main Street Houston Texas 77005 USA State Key Laboratory of Bioelectronics School of Biological Science and Medical Engineering Southeast University Nanjing 210096 China Department of Materials Science and NanoEngineering Rice University 6100 Main Street Houston Texas 77005 USA

Sandwich structured graphene-wrapped FeS-graphene nanoribbons （G@FeS-GNIKs） were developed. In this composite, FeS nanoparticles were sandwiched between graphene and graphene nanoribbons. When used as anodes in lithium ion batteries （L1Bs）, the G@FeS-GNR composite demonstrated an outstanding electrochemical performance. This composite showed high reversible capacity, good rate performance, and enhanced cycling stability owing to the synergy between the electrically conductive graphene, graphene nanoribbons, and FeS. The design concept developed here opens up a new avenue for constructing anodes with improved electrochemical stability for LIBs.

关键词： lithium ion battery iron sulfide graphene nanoribbons graphene energy storage

ASYMPTOTIC ANALYSIS OF SHELLS VIA г-CONVERGENCE

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2000年第4期18卷 337-352页

作者： Karine Genevey (Laboratoire D’Analyse Numerique, tour 55, Universite Pierre et Marie Curie, 4 place Jussieu, 75005 Paris, France) Universite Pierre et Marie Curie 法国 Paris 75005

We give a new justification of the linear membrane and flexural shell models. We prove that the sequence of scaled energy functionals associated with the scaled problem r-converges to the energy functional associated with a two-dimensional model. This two-dimensional model is a membrane or flexural one, depending on the geometric and kinematic conditions. Then, a classical argument allows to give a new proof of the convergence theorems recently obtained by P.G. Ciarlet, V. Lods and B. Miara.

关键词： г-converges linear elastic shell