检索结果-南通市图书馆

Weak mismatch epitaxy and structural feedback in graphene growth on copper foil

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 99-112页

作者： Neil R. Wilson Alexander j. Marsden Mohammed Saghir Catherine j. Bromley Renald Schaub Giovanni Costantini Thomas W. White Cerianne Partridge Alexei Barinov Pavel Dudin Ana M. Sanchez james j. mudd Marc Walker Gavin R. Bell Department of Physics University of Warwick Coventry CV4 7AL UK EaStCHEM School of Chemistry University of St Andrews St Andrews KY16 9ST UK Department of Chemistry University of Warwick Coventry CV4 7AL UK Sincrotrone Trieste S.Cp.A. Area Science Park 1-34012 Basovizza Trieste Italy

Graphene growth by low-pressure chemical vapor deposition on low cost copper foils shows great promise for large scale applications. It is known that the local crystallography of the foil influences the graphene growth rate. Here we find an epitaxial relationship between graphene and copper foil. Interfacial restructuring between graphene and copper drives the formation of （nl0） facets on what is otherwise a mostly Cu（100） surface, and the facets in turn influence the graphene orientations from the onset of growth. Angle resolved photoemission shows that the electronic structure of the graphene is decoupled from the copper indicating a weak interaction between them. Despite this, two preferred orientations of graphene are found, ±8° from the Cu[010] direction, creating a non-uniform distribution of graphene grain boundary misorientation angles. Comparison with the model system of graphene growth on single crystal Cu（110） indicates that this orientational alignment is due to mismatch epitaxy. Despite the differences in symmetry the orientation of the graphene is defined by that of the copper. We expect these observations to not only have importance for controlling and understanding the growth process for graphene on copper, but also to have wider implications for the growth of two-dimensional materials on low cost metal substrates.

关键词： graphene chemical vapordeposition mismatch epitaxy structural feedback low energy electrondiffraction angle resolvedphoto-emissionspectroscopy (ARPES)

Treating amyotrophic lateral sclerosis with allogeneic Schwann cell-derived exosomal vesicles: a case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第4期20卷 1207-1216页

作者： Pascal j.Goldschmidt-Clermont Aisha Khan George j.msheleishvili Patricia Graham Adriana Brooks Risset Silvera Alexander j.P.Goldschmidt Damien D.Pearse W.Dalton Dietrich Allan D.Levi james D.Guest Miller School of Medicine University of MiamiMiamiFLUSA Stem Cell Institute Miller School of MedicineUniversity of MiamiMiamiFLUSA The Miami Proj.ct to Cure Paralysis Miller School of MedicineUniversity of MiamiMiamiFLUSA Alzady International LLC MiamiFLUSA Neurological Surgery Miller School of MedicineUniversity of MiamiMiamiFLUSA

Schwann cells are essential for the maintenance and function of motor neurons,axonal networks,and the neuromuscular *** amyotrophic lateral sclerosis,where motor neuron function is progressively lost,Schwann cell function may also be ***,important signaling and potential trophic activities of Schwann cell-derived exosomal vesicles have been *** case report describes the treatment of a patient with advanced amyotrophic lateral sclerosis using serial intravenous infusions of allogeneic Schwann cell-derived exosomal vesicles,marking,to our knowledge,the first instance of such *** 81-year-old male patient presented with a 1.5-year history of rapidly progressive amyotrophic lateral *** initial diagnosis,the patient underwent a combination of generic riluzole,sodium phenylbutyrate for the treatment of amyotrophic lateral sclerosis,and *** patient volunteered to participate in an FDA-approved single-patient expanded access treatment and received weekly intravenous infusions of allogeneic Schwann cell-derived exosomal vesicles to potentially restore impaired Schwann cell and motor neuron *** confirmed that cultured Schwann cells obtained from the amyotrophic lateral sclerosis patient via sural nerve biopsy appeared impaired(senescent)and that exposure of the patient’s Schwann cells to allogeneic Schwann cell-derived exosomal vesicles,cultured expanded from a cadaver donor improved their growth capacity in *** a period of observation lasting 10 weeks,during which amyotrophic lateral sclerosis Functional Rating Scale-Revised and pulmonary function were regularly monitored,the patient received weekly consecutive infusions of 1.54×1012(×2),and then consecutive infusions of 7.5×1012(×6)allogeneic Schwann cell-derived exosomal vesicles diluted in 40 mL of Dulbecco’s phosphate-buffered *** of the infusions were associated with adverse events such as infusion reactions(allergic or otherwise)or

关键词： allogeneic amyotrophic lateral sclerosis exosomes infusion neuromuscular j.nction Schwann cell

ecent advances in selective acetylene hydrogenation using palladium containing catalysts

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2015年第2期9卷 142-153页

作者： Alan j. McCue james A. Anderson Surface Chemistry and Catalysis Group Department of Chemistry University of Aberdeen Aberdeen AB24 3UE UK Materials and Chemical Engineering Group School of Engineering University of Aberdeen Aberdeen AB24 3UE UK

Recent advances with Pd containing catalysts for the selective hydrogenation of acetylene are described. The overview classifies enhancement of catalytic proper- ties for monometallic and bimetallic Pd catalysts. Activity/ selectivity of Pd catalysts can be modified by controllingparticle shape/morphology or immobilisation on a support which interacts strongly with Pd particles. In both cases enhanced ethylene selectivity is generally associated with modifying ethylene adsorption strength and/or changes to hydride formation. Inorganic and organic selectivity modifiers （i.e., species adsorbed onto Pd particle surface） have also been shown to enhance ethylene selectivity. Inorganic modifiers such as TiO2 change Pd ensemble size and modify ethylene adsorption strength whereas organic modifiers such as diphenylsulfide are thought to create a surface template effect which favours acetylene adsorption with respect to ethylene. A number of metals and synthetic approaches have been explored to prepare Pd bimetallic catalysts. Examples where enhanced selectivity is observed are generally associated with decreased Pd ensemble size and/or hindering of the ease with which an unselective hydride phase is formed for Pd. A final class of bimetallic catalysts are discussed where Pd is not thought to be the primary reaction site but merely acts as a site where hydrogen dissociation and spillover occurs onto a second metal （Cu or Au） where the reaction takes place more selectively.

关键词： acetylene ethylene selective hydrogenation,palladium bimetallic

HEALTHCARE: A COMPLEX SERVICE SYSTEM

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

j.urnal of Systems Science and Systems Engineering 2009年第3期18卷 257-282页

作者： james M. TIEN Pascal j. GOLDSCHMIDT-CLERMONT Dean College of Engineering University of Miami Coral GablesFlorida USA Dean Miller School of Medicine University of Miami Coral GablesFlorida USA

Healthcare is indeed a complex service system, one requiring the technobiology approach of systems engineering to underpin its development as an integrated and adaptive system. In general, healthcare services are carried out with knowledge-intensive agents or components which work together as providers and consumers to create or co-produce value. Indeed, the engineering design of a healthcare system must recognize the fact that it is actually a complex integration of human-centered activities that is increasingly dependent on information technology and knowledge. Like any service system, healthcare can be considered to be a combination or recombination of three essential components - people （characterized by behaviors, values, knowledge, etc.）, processes （characterized by collaboration, customization, etc.） and products （characterized by software, hardware, infrastructures, etc.）. Thus, a healthcare system is an integrated and adaptive set of people, processes and products. It is, in essence, a system of systems which obj.ctives are to enhance its efficiency （leading to greater interdependency） and effectiveness （leading to improved health）. Integration occurs over the physical, temporal, organizational and functional dimensions, while adaptation occurs over the monitoring, feedback, cybernetic and learning dimensions. In sum, such service systems as healthcare are indeed complex, especially due to the uncertainties associated with the human-centered aspects of these systems. Moreover, the system complexities can only be dealt with methods that enhance system integration and adaptation.

关键词： Services healthcare system integration system adaptation system complexity system of systems customization co-production decision informatics real-time decision making

A polarizing situation： Taking an in-plane perspective for next-generation near-field studies

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2016年第2期11卷 1-17页

作者： P. james Schuck Wel Bao Nicholas j. Borys Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA 94720 USA Department of Materials Science and Engineering University of California Berkeley CA 94720-1760 USA

By enabling the probing of light-matter interactions at the functionally relevant length scales of most materials, near-field optical imaging and spectroscopy accesses information that is unobtainable with other methods. The advent of apertureless techniques, which exploit the ultralocalized and enhanced near-fields created by sharp metallic tips or plasmonic nanoparticles, has resulted in rapid adoption of near-field approaches for studying novel materials and phenomena, with spatial resolution approaching sub-molecular levels. However, these approaches are generally limited by the dominant out-of-plane polarization response of apertureless tips, restricting the exploration and discovery of many material properties. This has led to recent design and fabrication breakthroughs in near-field tips engineered specifically for enhancing in-plane interactions with near-field light components. This mini-review provides a perspective on recent progress and emerging directions aimed at utilizing and controlling in-plane optical polarization, highlighting key application spaces where in-plane near-field tip responses have enabled recent advancements in the understanding and development of new nanostructured materials and devices.

关键词： near-field optical microscopy nano-optics TERS plasmonics optical antenna 2D materials

Strigolactones and the Regulation of Pea Symbioses in Response to Nitrate and Phosphate Deficiency

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2013年第1期6卷 76-87页

作者： Eloise Foot Kaori Yoneyama Cassandra j. Hugill Laura j. Quittenden james B. Reidt School of Plant Science University of Tasmania Private Bag 55 Hobart Tasmania 7001 Australia Weed Science Centre Utsunomiya University 350 Mine-machi Utsunomiya 321-8505 Japan

New roles for the recently identified group of plant hormones, the strigolactones, are currently under active investigation. One of their key roles is to regulate plant symbioses. These compounds act as a rhizosphere signal in arbuscular mycorrhizal symbioses and as a positive regulator of nodulation in legumes. The phosphorous and nitrogen status of the soil has emerged as a powerful regulator of strigolactone production. However, until now, the potential role of strigolactones in regulating mycorrhizal development and nodulation in response to nutrient deficiency has not been proven. In this paper, the role of strigolactone synthesis and response in regulating these symbioses is examined in pea （Pisum sativum L.）. Pea is well suited to this study, since there is a range of well-characterized strigolactone bio- synthesis and response mutants that is unique amongst legumes. Evidence is provided for a novel endogenous role for strigolactone response within the root during mycorrhizal development, in addition to the action of strigolactones on the fungal partner. The strigolactone response pathway that regulates mycorrhizal development also appears to dif- fer somewhat from the response pathway that regulates nodulation. Finally, studies with strigolactone-deficient pea mutants indicate that, despite strong regulation of strigolactone production by both nitrogen and phosphate, strigolac- tones are not required to regulate these symbioses in response to nutrient deficiency.

关键词： Strigolactones nodulation mycorrhizae nitrate phosphate pea.

American government The Essentials james Q. Wilson, j.hn j. Dilulio 8th ed.; postinaugural ed.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American government The Essentials James Q. Wilson, John J. ...

Accurate Gain Flattening Filters Manufactured by Optical Compensation Monitoring Method

2001年

作者： james Q. Wilson j.hn j. Dilulio

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

光学学报 2003年第S1期23卷 -页

作者： j. j. Pan james Guo j.y j.ang Lightwaves 2020 Inc. 1323 Great Mall Drive Milpitas CA 95035 USALightwaves 2020 Inc. 1323 Great Mall Drive Milpitas CA 95035 USALightwaves 2020 Inc. 1323 Great Mall Drive Milpitas CA 95035 USA

GFFs with less than 0.4 dB peak-to-peak error functions are routinely fabricated using commercially available coating machines by utilizing the natural error compensation mechanism of wavelength variable turning point... 详细信息

关键词： that in of on by GFF Accurate Gain Flattening Filters Manufactured by Optical Compensation Monitoring Method for than

Potential Applications of Polymer Microchips in Pharmaceuticals

在线全文

学校读者我要写书评

暂无评论

材料科学与工程学报 2000年第z2期20卷 993-1000页

作者： james j. Bao Prcoter & Gamble Pharmaceuticals P.O.Box 8006 MasonOH 45040USA

Some of the most recent development in polymer based microchips have been reviewed. Different methods used in fabricating ploymer microchips are introduced. The inportance and applications of the ploymer microchip in pharmaceutical and other areas are discussed. Finally, the potential problems and development areas in polymer microchip technology are also addressed.

关键词： used in