检索结果-南通市图书馆

Science China Chemistry 2016年第4期59卷 482-486页

作者： Saeideh Ghazali-Esfahani Emilia Paunescu Mojtaba Bagherzadeh Zhaofu Fei Gabor Laurenczy Paul J.dyson Institut des Sciences et Ingénierie Chimiques Ecole Polytechnique Fédérale de LausanneLausanne CH-I O15Switzerland Chemistry Department Sharif University of TechnologyTehran 11155-3615lran

Palladium nanoparticles immobilized on a cross-linked imidazolium-containing polymer were evaluated as a catalyst for Suzuki carbon-carbon cross-coupling reactions using water as the solvent. The nanocatalysts show good catalytic activities for aryl iodides and aryl bromides and moderate activity with aryl chloride substrates. Coupling of sterically hindered substrates could also be achieved in reasonable yields. The heterogeneous catalyst is stable, can be stored without precautions to exclude air or moisture, and can be easily recycled and reused.

关键词： catalysis biphasic catalysis polymeric ionic liquids nanoparticles aqueous phase catalysis Suzuki reaction

Vertical Cavity Semiconductor Optical Amplifiers:Physics and Applications

在线全文

学校读者我要写书评

暂无评论

光学学报 2003年第S1期23卷 449-450页

作者： M J Adams D Alexandropoulos G Dubois A dyson Department of Electronic Systems Engineering University of Essex Wivenhoe Park Colchester CO4 3SQ UKDepartment of Electronic Systems Engineering University of Essex Wivenhoe Park Colchester CO4 3SQ UKDepartment of Electronic Systems Engineering University of Essex Wivenhoe Park Colchester CO4 3SQ UKDepartment of Electronic Systems Engineering University of Essex Wivenhoe Park Colchester CO4 3SQ UK

A review is presented of the state-of-the-art in vertical cavity semiconductor optical amplifiers (VCSOAs), focusing in particular on recent developments in theoretical analysis, wavelengths of operation, materials sy... 详细信息

关键词： been it on Vertical Cavity Semiconductor Optical Amplifiers in VCSEL have that of for GaAs

Dealing with Climate Change in a Digital Age

在线全文

学校读者我要写书评

暂无评论

Journal of Philosophy Study 2017年第8期7卷 437-444页

作者： Rose A. dyson Canadians Concerned about Violence in Entertainment

Digital technologies offer unprecedented opportunities in addressing climate change as public policy requirements increasingly pervade national boundaries. Health issues now merge with those in education, the environment, energy, culture, gender, security, and the economy. They offer enormous potential in mobilizing for political action. But they also have a dark side. Outgoing U.S. President Barack Obama issued a warning that social media in particular poses an existential threat to democracy. Their pervasive influence during the 2016 American presidential election highlighted the potential for the spread of fake news and alternative facts. These realities must be recognized and addressed if meaningful policies on climate change and future sustainability are to be achieved. The challenges ahead require a re-examination of overarching trends in mass media that date back to the middle of the last century. Warnings from scientists, scholars, and community activists indicate that, on the issue of climate change, time is running out. In his Encyclical on Climate Change and Inequality, Pope Francis amplified the urgent call to action. But collectively, we need to rethink the profit driven ways in which our proliferating digital technologies mitigate potential steps toward a sustainable future. In a myriad of forms that go well beyond the seductive and addicting trends of endless hours spent online, new and proliferating digital toys and gadgets are neither carbon neutral, nor as some proponents would have us believe, do they hold the sole promise of innovation and job creation. Additionally, their potential must be harnessed to maintain rather than disrupt social stability.

关键词： digital health climate culture economy policy media sustainability democracy warnings disruption seduction

Single-step conversion of lignin monomers to phenol: Bridging the gap between lignin and high-value chemicals

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2018年第9期39卷 1445-1452页

作者： Jiaguang Zhang Loris Lombardo Gokalp Gozaydin Paul J.dyson Ning Yan Department of Chemical and Biomolecular Engineering National University of Singapore117585 Singapore School of Chemistry University of LincolnJoseph Banks LaboratoriesGreen LaneLincolnLN6 7DLUnited Kingdom Institute of Chemical Sciences and Engineering Ecole Polytechnique Fédérale de Lausanne （EPFL） CH‐1015Switzerland

Transformation of lignin into high-value chemicals is hampered by the complexity of monomers obtained from lignin depolymerization. Here we report a strategy, composed of hy-dro-demethoxylation and de-alkylation reactions, that is able to chemically converge various lig-nin-derived phenolic monomers into phenol in a single-step. Using 2-methoxy-4-propylphenol as a model compound, Pt/C exhibited the best performance in hydro-demethoxylation reaction afford-ing 80% 4-propylphenol from 2-methoxy-4-propylphenol, while H-ZSM-5 was identified as the most suitable catalyst for de-alkylation, achieving 83% yield of phenol from 4-propylphenol. Since the two catalysts operate under compatible conditions, combining the two catalysts to simultane-ously promote both hydro-demethoxylation and de-alkylation reactions was achieved. Configura-tion of how to organize the catalysts is a critical parameter, where the physical mixture of the two was most effective, providing over 60% phenol from 2-methoxy-4-propylphenol in a single-step.

关键词： LigninPhenol ZeoliteDe‐alkylation Hydro‐demethoxylation

Fatal gastrointestinal histoplasmosis 15 years after orthotopic liver transplantation

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2017年第43期23卷 7807-7812页

作者： Nikita Agrawal David EJ Jones Jessica K dyson Tim Hoare Sharon A Melmore Stephanie Needham Nick P Thompson Department of Gastro-enterology Newcastle Hospitals NHS Foundation TrustNewcastle Upon Tyne NE7 7DNUnited Kingdom Faculty of Medical Sciences Newcastle UniversityNewcastle Upon Tyne NE7 7DNUnited Kingdom Department of Radiology Newcastle Hospitals NHS Foundation TrustNewcastle Upon Tyne NE7 7DNUnited Kingdom Department of Histopathology Newcastle Hospitals NHS Foundation TrustNewcastle Upon Tyne NE7 7DNUnited Kingdom

We report a case of ileo-colonic Histoplasmosis without apparent respiratory involvement in a patient who had previously undergone an orthotopic liver transplant(OLT) for primary biliary cholangitis 15 years earlier. The recipient lived in the United Kingdom,a non-endemic region for Histoplasmosis. However,she had previously lived in rural southern Africa prior to her OLT. The patient presented with iron deficiency anaemia,diarrhoea,abdominal pain and progressive weight loss. She reported no previous foreign travel,however,it later became known that following her OLT she had been on holiday to rural southern Africa. On investigation,a mild granulomatous colitis primarily affecting the right colon was identified,that initially improved with mesalazine. Her symptoms worsened after 18 mo with progressive ulceration of her distal small bowel and right colon. Mycobacterial,Yersinia,cytomegalovirus and human immunodeficiency virus infections were excluded and the patient was treated with prednisolone for a working diagnosis of Crohn's disease. Despite some early symptom improvement following steroids,there was subsequent deterioration with the patient developing gram-negative sepsis and multi-organ failure,leading to her death. Post-mortem examination revealed that her ileo-colonic inflammation was caused by Histoplasmosis.

关键词： Histoplasmosis Orthotopic liver transplant Primary biliary cholangitis Primary biliary cholangitis

天蓝色链霉菌—研究放线菌分裂发育的模式菌（英文）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

兰州大学学报（医学版） 2015年第2期41卷 1-6页

作者： Paul dyson 英国斯旺西大学分子生物学中心

细菌生长主要通过细胞伸长和分裂的不断循环过程来实现的。由于抗生素可以抑制细菌的生长,因此在医学上主要使用抗生素来治疗传染性疾病。不同的抗生素能够抑制不同的细胞生长进程。例如,β-内酰胺类抗生素可以抑制细菌细胞壁中肽聚糖... 详细信息

细菌生长主要通过细胞伸长和分裂的不断循环过程来实现的。由于抗生素可以抑制细菌的生长,因此在医学上主要使用抗生素来治疗传染性疾病。不同的抗生素能够抑制不同的细胞生长进程。例如,β-内酰胺类抗生素可以抑制细菌细胞壁中肽聚糖的合成。临床医学上使用的抗生素主要是链霉菌的天然产物。链霉菌是一类生长于土壤中的放线菌,具有高分化能力,其孢子不能运动。尽管链霉菌的许多生物学特征与临床上的病原菌结核分支杆菌非常相似,但是链霉菌属有一个主要代谢特征,那就是它能够产抗生素。截止目前,尽管人类在链霉菌中尚未发现抑制细菌分裂的抗生素,但是一些其他生物的天然产物以及人工化学合成的化合物均可以抑制细菌分裂过程中重要蛋白分子Fts Z的聚合。该综述将围绕链霉菌的模式菌—天蓝色链霉菌来阐述放线菌的分裂方式,最终阐明调控细菌分裂特异蛋白的生物学功能以及对它们作为新抗生素药物靶位点的价值。

关键词：天蓝色链霉菌分裂发育放线菌

Highly Efficient and Stable FAPbI_(3) Perovskite Solar Cells and Modules Based on Exposure of the(011)Facet

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2023年第9期15卷 164-174页

作者： Kai Zhang Bin Ding Chenyue Wang Pengju Shi Xianfu Zhang Cheng Liu Yi Yang Xingyu Gao Rui Wang Li Tao Keith G.Brooks Songyuan Dai Paul J.dyson Mohammad Khaja Nazeeruddin Yong Ding Beijing Key Laboratory of Novel Thin-Film Solar Cells North China Electric Power UniversityBeijing 102206People’s Republic of China Institut des Sciences et Ingénierie Chimiques Ecole Polytechnique Fédérale de Lausanne(EPFL)Lausanne 1015Switzerland Shanghai Synchrotron Radiation Facility(SSRF) Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204People’s Republic of China School of Engineering Westlake University and Institute of Advanced TechnologyWestlake Institute for Advanced StudyHangzhou 310024People’s Republic of China Hubei Yangtze Memory Laboratories Wuhan 430205People’s Republic of China School of Microelectronics Hubei UniversityWuhan 430062People’s Republic of China

Perovskite crystal facets greatly impact the performance and stability of their corresponding photovoltaic *** to the(001)facet,the(011)facet yields better photoelectric properties,including higher conductivity and enhanced charge carrier ***,achieving(011)facet-exposed films is a promising way to improve device ***,the growth of(011)facets is energetically unfavorable in FAPbI_(3) perovskites due to the influence of methylammonium chloride ***,1-butyl-4-methylpyridinium chloride([4MBP]Cl)was used to expose(011)***[4MBP]^(+)cation selectively decreases the surface energy of the(011)facet enabling the growth of the(011)***[4MBP]^(+)cation causes the perovskite nuclei to rotate by 45°such that(011)crystal facets stack along the out-of-plane ***(011)facet has excellent charge transport properties and can achieve better-matched energy level *** addition,[4MBP]Cl increases the activation energy barrier for ion migration,suppressing decomposition of the *** a result,a small-size device(0.06 cm2)and a module(29.0 cm2)based on exposure of the(011)facet achieved power conversion efficiencies of 25.24%and 21.12%,respectively.

关键词： Renewable energy Perovskite solar cell Perovskite solar module Facet engineering

How Cooperative Learning Is Conceptualized and Implemented in Chinese Physical Education:A Systematic Review of Literature

在线全文

学校读者我要写书评

暂无评论

ECNU Review of Education 2022年第1期5卷 185-206页

作者： Yanhua Shen Wen Xiong Linxiu Dang The University of Auckland Fujian Normal University Department of Kinesiology The University of North Carolina at Greensboro3706 Manor Dr.Apt AGreensboroNC 27403USA

Purpose:The purpose of this literature review was to investigate how cooperative learning(CL)has been conceptualized and implemented in Chinese physical education(PE).CL is one of the most influential and widespread areas of theory,research,and practice in western *** the promotion of Chinese government policies,CL has become a popular field of research and was widely used as a pedagogical practice in ***/Approach/Methods:Shulruf’s five methodological steps were utilized as the process of screening and selecting relevant *** analysis and constant comparison were conducted for analyzing the chosen ***:The analytic induction revealed four key themes:(a)historical development,(b)policy influence,(c)conceptualization of CL,and(d)implementation of *** found that the conceptualization of CL in Chinese PE was ambiguous,and the implementation of CL was predominantly documented by quantitative research *** addition,few studies were conducted at the elementary school ***/Value:This is a comprehensive literature review on CL in Chinese *** and recommendations in this article will be beneficial for policymakers,scholars,and PE teachers to better understand and promote CL in China.

关键词： Chinese physical education cooperative learning education systematic literature review Date received

High-quality draft genome sequence of Streptomyces agglomeratus 5-1-8 with strong anti-MRSA ability, isolated from the frozen soil of Tibet in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Cold and Arid Regions 2017年第5期9卷 503-510页

作者： XiMing Chen Ling Zhang HaiLi Sun ShuYan Li SiJing Chang QingFeng Zhang BingLin Zhang Tuo Chen GuangXiu Liu Paul dyson Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou Gansu 730000 China Key Laboratory of Extreme Environmental Microbial Resources and Engineering of Gansu Province Lanzhou Gansu 730000 China Xinjiang Institute of Ecology and Geography Chinese Academy of Science Urumqi Xinjiang 830011 China School of Chemistry and Environment Science Lanzhou City University Lanzhou Gansu 730000 China College of Chemistry and Chemical Engineering Lanzhou University Lanzhou Gansu 730000 China School of Life Sciences Lanzhou University Lanzhou Gansu 730000 China Institute of Life Science College of Medicine Swansea University Singleton Park Swansea SA2 8PP UK

Streptomyces agglomeratus 5-1-8 with strong anti methicillin-resistant Staphylococcus aureus(MRSA)ability,isolated from the frozen soil of Tibet in China,has a strong ability to kill the multi-drugs-resistant *** identify the second-ary metabolism ability of this strain,we describe here the phenotypic characteristics of this strain,along with its high-quality draft genome sequence,its annotation,and *** 7.1M draft genome encodes 6,284 putative open reading frames(ORFs),of which 4,416 ORFs were assigned with clusters of orthologous genes(COG)***,65 t RNA genes and 24 r RNA operons were *** genome contains 12 gene clusters involved in antibiotics production and 1 gene cluster involved in anticancer-compounds production;4 gene clusters belong to polyketides and nonribosomal peptides,1gene cluster belong to the butyrolactone,4 gene clusters belong to the bacteriocin or lantipeptide,and 3 gene clusters belong to the *** genome-sequence data will facilitate efforts to probe the potential of new antibiotics to kill multidrugs-resistant MRSA.

关键词： Streptomyces antibiotic multi-drugs-resistant MRSA genome gene cluster

Characterization of Porosity in a Laser Sintered MMCp Using X-Ray Synchrotron Phase Contrast Microtomography

在线全文

学校读者我要写书评

暂无评论

Materials Sciences and Applications 2011年第9期2卷 1322-1330页

作者： Emmanuelle Girardin Chiara Renghini Jack dyson Vittorio Calbucci Francesca Moroncini Gianni Albertini 不详

Direct Laser Sintering (DSL), a technology enabling the production of dense metal components directly from 3D CAD data, was used for the first time to produce a Metal Matrix Composite (MMCp) based on Al-Si-Cu alloy in view of its application in different fields, in particular for aeronautics. The porosity of the material obtained so was investigated by using optical and electron microscopy and, in particular, X-ray computed microtomography techniques. DSL is a unique technique to produce complex components in an economical way while computed microtomography is a unique technique to evaluate the porosity and pore and cracks distribution in a not destructive way. A near homogeneous distribution of the porosity and pore sizes was observed both comparing different regions of the same specimen and also by comparing different samples obtained by using the same DLS production method. A quantitative analysis of the damage in the composite is also reported.

关键词： Metal Matrix Composite Direct Laser Sintering X-Ray Synchrotron Computed Microtomography Porosity