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SnO2-reduced graphene oxide nanoribbons as anodes for lithium ion batteries with enhanced cycling stability

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Nano Research 2014年第9期7卷 1319-1326页

作者： Lei Li Anton Kovalchuk James M. tour Department of Chemistry Rice University 6 I00 Main Street Houston Texas 77005 USA Richard E. Smalley Institute for Nanoscale Science and Technology Rice University 6100 Main Street Houston Texas 77005 USA Department of Materials Science and NanoEngineering Rice University 6100 Main Street Houston Texas 77005 USA

A nanocomposite material of SnO2-reduced graphene oxide nanoribbons has been developed. In this composite, the reduced graphene oxide nanoribbons are uniformly coated by nanosized SnO2 that formed a thin layer of SnO2 on the surface. When used as anodes in lithium ion batteries, the composite shows outstanding electrochemical performance with the high reversible discharge capacity of 1,027 mAh/g at 0.1 A/g after 165 cycles and 640 mAh/g at 3.0 A/g after 160 cycles with current rates varying from 0.1 to 3.0 A/g and no capacity decay after 600 cycles compared to the second cycle at a current density of 1.0 A/g. The high reversible capacity, good rate performance and excellent cycling stability of the composite are due to the synergistic combination of electrically conductive reduced graphene oxide nanoribbons and SnO2, The method developed here is practical for the large-scale development of anode materials for lithium ion batteries.

关键词： lithium ion battery tin oxide graphene oxide nanoribbons energy storage

Confirmatory analysis of the 13‐MD and ranking of its meta‐dimensions and items

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Health Care Science

Health Care Science 2024年第4期3卷 249-263页

作者： Moustapha touré Thomas G.Poder École de gestion Universitéde SherbrookeSherbrookeQuebecCanada Centre de recherche de l'IUSMM CIUSSS de l'Est de l'île de MontréalMontrealQuebecCanada École de santépublique Universitéde MontréalMontrealQuebecCanada

Background:The 13‐MD is a new generic instrument developed to measure general health‐related quality of life(GHRQoL).This instrument considers all aspects of health(i.e.,physical,mental,and social)in a balanced way.A previous study led to minor changes in the original version of the 13‐*** objective of this study was to confirm the validity of the modified 13‐***:Validity was assessed with recent data from the general population of Quebec,*** meta‐dimensions and items composing the 13‐MD were also subjected to a ranking procedure,which allowed to determine the most important aspects for ***:A total of 1337 French‐speaking participants were recruited with 1099 completing the 13‐MD for validation purposes and 1084 completing the ranking *** 13‐MD showed very satisfactory results and confirmed to be a valid *** ranking of the meta‐dimensions revealed that“Well‐being”received the most points,followed by“Sleep and energy”and“Body functioning.”Conclusion:These results will be very useful in the continuous improvement of the 13‐MD,ultimately leading to the valuation stage(i.e.,development of a value set).

关键词： cost‐utility analysis health‐related quality of life generic instrument

Soluble Graphene Through Edge-Selective Functionalization

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Nano Research 2010年第2期3卷 117-125页

作者： Zhengzong Sun Shin-ichiro Kohama Zengxing Zhang Jay RLomeda James M.tour Department of Chemistry and Mechanical Engineering and Materials Science and the Smalley Institute for Nanoscale Science and Technology Rice UniversityMS 2226100 Main StreetHoustonTexas 77005USA

Thermally expanded graphite was functionalized with 4-bromophenyl addends using the in situ diazonium formation procedure,and after mild sonication treatment in N,N’-dimethylformamide,thin graphene layers were exfoliated from the bulk *** chemically-assisted exfoliated graphene(CEG)sheets had higher solubility than pristine graphene without any stabilizer *** than 70%of these soluble flakes had less than 5 *** filtered transmission electron microscopy(EFTEM)elemental mapping provided evidence of the edge-selective diazonium functionalization with graphene.A majority of the Br signals came from the edges of the CEG indicating that the basal planes were not highly *** CEG was also characterized by X-ray photoelectron spectroscopy,atomic force microscopy,Raman spectroscopy,and transmission electron microscopy.

关键词： Edge-selective functionalization graphene energy filtered transmission electron microscopy(EFTEM) chemically-assisted exfoliation

Measuring quality of life at work for healthcare and social services workers:A systematic review of available instruments

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Health Care Science

Health Care Science 2023年第3期2卷 173-193页

作者： Liang Wang Moustapha touré Thomas G.Poder Department of Management Evaluation and Health PolicySchool of Public HealthUniversity of MontrealMontrealQuebecCanada Department of Economics University of SherbrookeSherbrookeQuebecCanada Centre de recherche de l'IUSMM CIUSSS de l'Est de l'île de MontréalMontréalQuébecCanada

Quality of life at work is an important and widely discussed concept in the *** instruments can be used to measure it,but with regard to healthcare and social services,the existing instruments are not well known.A review of available instruments intending to capture the quality of life of healthcare and social services workers(QoLHSSW)is necessary to better assess their working conditions and promote programs/guidelines to improve these *** aim of this study was to identify the existing instruments used in measuring QoLHSSW and explore their *** attention was given to instruments adapted to the province of Quebec,Canada,which enabled the determination of which instruments are adapted for the measurement of QoLHSSW in Quebec and possibly elsewhere.A systematic review of the literature was conducted according to the JBI methodological *** articles'selection procedure was performed according to the PRISMA *** search was conducted up to October 28,2021,and then updated on January 25,2023,in four databases:PsycINFO,Medline,Embase,and *** selection and extraction were performed independently by two *** analysis of the quality of the studies was performed with the COnsensus‐based Standards for the selection of health Measurement *** a total of 8178 entries,13 articles corresponding to 13 instruments were *** these instruments,the common aspects that were considered were work conditions,job satisfaction,stress at work,relationship/balance,and career *** instruments used a 5‐point Likert *** validation methods were used,including reporting Cronbach's alpha for overall scale reliability;factor analysis to test construct validity;different model fit indices to test model superiority;different language comparisons to test cross‐cultural validity;and qualitative expert reviews to assess content validity.

关键词： quality of life work healthcare and social services instruments systematic review Quebec

Investigations into Some Simple Expressions of the Gamma Function in Wind Power Theoretical Estimate by the Weibull Distribution

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Journal of Applied Mathematics and Physics 2019年第12期7卷 2990-3002页

作者： Siaka touré Solar Energy Laboratory FHB University Abidjan Cocody Abidjan C&#244 te d’Ivoire

The Weibull distribution is a probability density function (PDF) which is widely used in the study of meteorological data. The statistical analysis of the wind speed v by using the Weibull distribution leads to the estimate of the mean wind speed , the variance of v around and the mean power density in the wind. The gamma function Γ is involved in those calculations, particularly Γ (1+1/k), Γ (1+2/k) and Γ (1+3/k). The paper reports the use of the Weibull PDF f(v) to estimate the gamma function. The study was performed by looking for the wind speeds related to the maximum values of f(v), v2 f(v) and v3 f(v). As a result, some approximate relationships were obtained for Γ (1+1/k), Γ (1+2/k) and Γ (1+3/k), that use some fitting polynomial functions. Very good agreements were found between the exact and the estimated values of Γ (1+n/k) that can be used for the estimation of the mean wind speed , the variance σ2 of the wind speed v;around the mean speed and the average wind power density.

关键词： Gamma Function Weibull Distribution Beta Function Mean Wind Speed Average Wind Power Density

Effect of the Dynamic Resistance on the Maximum Output Power in Dynamic Modelling of Photovoltaic Solar Cells

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Open Journal of Modelling and Simulation 2022年第1期10卷 48-57页

作者： Siaka touré Solar Energy Laboratory Félix Houphou&#235t-Boigny University of Abidjan Cocody Abidjan C&#244te d’Ivoire

Several studies on PV solar cells are found in the literature which use static models. Those models are mainly one-diode, two-diode or three-diode models. In the dynamic modelling, a variable parallel capacitance is incorporated. Unlike the previous studies which do not clearly establish a relationship between the capacitance and the voltage, in the present paper, the link between the capacitance and the voltage is investigated and established. In dynamic modelling investigated in this paper, the dynamic resistance is introduced in the modelling of the solar cell. It is introduced in the current-voltage characteristic. The value of the dynamic resistance is evaluated at the maximum power point and its effect on the maximum power is investigated. The study shows for the first time, that the dynamic resistance must be introduced in the current-voltage characteristic, because it has an influence on the PV cell output.

关键词： Photovoltaic Solar Cells Dynamic Modelling Dynamic Resistance Diffusion Capacitance Transition Capacitance

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

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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

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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

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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