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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

Effect of anchor and functional groups in functionalized graphene devices

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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

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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?

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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

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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

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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

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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

Spondyloarthritis Associated with Inflammatory Bowel Disease: Study of 15 Observations in Guinea

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Open Journal of Rheumatology and Autoimmune Diseases 2021年第2期11卷 89-95页

作者： Condé Kaba Awada Mohamed Carlos Othon Guelngar Adjibaye Emmanuel Sanni yaya Aminou Mamadou Hady Diallo touré Moriba Kamissoko Aly Badra Konaté Ibrahima Sory Fodé Abass Cissé Department of Rheumatology Academic Hospital University of Conakry Guinea Department of Neurology Academic Hospital University of Conakry Guinea Department of infectious disease Reference Hospital Ndjamena Chad

Objective: Rheumatologic disorders of chronic inflammatory bowel disease (IBD) and reactive arthritis with a digestive origin are part of the spondyloarthritis family. In black Africa, the prevalence of SpA associated with IBD is not clearly established. Thus the objective of our study was to describe the clinical and radiological characteristics of spondyloarthritis associated with IBD. Patients and Method: We carried out a prospective study in the rheumatology department of CHU Ignace Deen between January and December 2019. The diagnosis of SpA was based on clinical and biological arguments in accordance with the criteria of Amor and ASAS. Results: Fifteen observations of spondyloarthritis associated with IBD were collected in patients mean age 52 years with extremes of 32 and 65 years. 9 (53.33%) were female. Ten patients had Crohn’s disease (CD) and 5 had ulcerative colitis (UC). The mean number of pushes was 2.5 ± 1.2. The average diagnostic time was 46 months. Sacroiliitis was present in 73.3% of cases and the mean mSASSS score at diagnosis was 32.11/72. In total, corticosteroids were used in 9 (60%) of patients, NSAIDs in 26.6% while DMARDs salazopyrine and methotrexate in 33.3% and 20% of patients, respectively. Conclusion: The MICI and SpA association is undoubtedly underestimated in our regions. Better collaboration between rheumatologists and gastroenterologists could facilitate diagnosis and improve care.

关键词： Spondyloarthritis Chronic Inflammatory Bowel Disease Guinea

Successful Separation of Conjoined Twins at the Conakry University Hospital Center

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Open Journal of Pediatrics 2022年第3期12卷 514-521页

作者： Mamadou Alpha touré Balla Keita Balla Moussa touré Naby Fofana Ibrahima Kalil Dioubaté Thiero Mamadou Aliou touré Pediatric Surgery Department Donka National Hospital Conakry Guinea Pediatric Surgery Unit General Surgery Department Ignace Deen Hospital Conakry Guinea Institute of Nutrition and Health for Children Conakry Guinea

Introduction: The birth of conjoined twins is an event extremely rare that offers unique therapeutic challenges and circumstances. We must examine each situation with the many questions that arise and which sometimes require a long reflection. We report a case of separation of pygopages conjoined twins as well as a review of the literature. Patients and Observations: a pair of conjoined twins aged 11 days, weighing 3080 g between them, was referred to the neonatology department from the Faranah prefecture, 300 km from Conakry, for care. The mother, a 30-year-old housewife, multipara, eight gestures and nine parities, had not followed any prenatal consultation. The delivery took place at home in a village with the death of the mother immediately postpartum. The clinical and paraclinical investigation had concluded with the diagnosis of Siamese type pygopage. After multidisciplinary consultation, the surgical treatment by separation of the twins was carried out at the age of 50 days with success and preservation of the physiological functions. Conclusion: The birth of conjoined twins is extremely rare. Each pair of Siamese is different and the surgical strategy must be adapted according to the shared organs. The perfect multidisciplinary work of the medical staff has been the main contributor to our success.

关键词： Siamese Twins Pygopages Multidisciplinarity Separation Conakry Hospital and University Center

Preparation of carbon-coated iron oxide nanoparticles dispersed on graphene sheets and applications as advanced anode materials for lithium-ion batteries

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Nano Research 2014年第4期7卷 502-510页

作者： Huilong Fei Zhiwei Peng Lei Li Yang Yang Wei Lu Errol L. G. Samuel Xiujun Fan James M. tour Department of Chemistry Rice University 6100 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

We report a novel chemical vapor deposition （CVD） based strategy to synthesize carbon-coated Fe203 nanoparticles dispersed on graphene sheets （Fe2Og@C@G）. Graphene sheets with high surface area and aspect ratio are chosen as space restrictor to prevent the sintering and aggregation of nanoparticles during high temperature treatments （800 ℃）. In the resulting nanocomposite, each individual Fe2O3 nanoparticle （5 to 20 nm in diameter） is uniformly coated with a continuous and thin （two to five layers） graphitic carbon shell. Further, the core-shell nanoparticles are evenly distributed on graphene sheets. When used as anode materials for lithium ion batteries, the conductive-additive-free Fe2OB@C@G electrode shows outstanding Li＋ storage properties with large reversible specific capacity （864 mAh/g after 100 cycles）, excellent cyclic stability （120% retention after 100 cycles at 100 mA/g）, high Coulombic efficiency （-99%）, and good rate capability.

关键词： Fe2O3 nanoparticles carbon coating graphene chemical vapor deposition(CVD) anode lithium ion batteries