检索结果-南通市图书馆

Tuning the face orientation of ZnO nano/microcrystals by a wet chemical method

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 Optics Letters 2013年第10期11卷 62-65页

作者： Aparna Thankappan Sheenu thomas V.p.N.Nampoori International School of photonics (ISp) Cochin University of Science and Technology Inter University Centre for Nanomaterials and Devices (IUCND) Cochin University of Science and Technology

We successfully synthesize four kinds of ZnO nano/microcrystals including dumbbell microrods, nanoflakes, nanoplates, and microrods by a simple wet chemical method. Growth duration is found to play a crucial role in the morphologies of these ZnO nano/microcrystallites. In addition, growth conditions are systematically studied as a function of precursor concentration and temperature. The structural and optical characteristics of the ZnO samples are further investigated by X-ray diffraction, scanning electron microscopy, and photoluminescence spectroscopy.

关键词： ZnO Tuning the face orientation of ZnO nano/microcrystals by a wet chemical method

The effects of Spirulina on anemia and immune function in senior citizens

在线全文

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2011年第3期8卷 248-254页

作者： Carlo Selmi patrick SC Leung Laura Fischer Bruce German Chen-Yen Yang thomas p Kenny Gerry R Cysewski M Eric Gershwin Division of Rheumatology Allergy and Clinical ImmunologyUniversity of California at DavisDavisCAUSA Department of Medicine IRCCS Istituto Clinico HumanitasRozzanoMilanItaly Department of Food Science and Technology University of California at DavisDavisCAUSA Cyanotech Kailua-KonaHIUSA

Anemia and immunological dysfunction(***)are commonly found in older subjects and nutritional approaches are sought to counteract these *** is a filamentous and multicellular bule-green alga capable of reducing inflammation and also manifesting antioxidant *** hypothesized that Spirulina may ameliorate anemia and immunosenescence in senior citizens with a history of *** enrolled 40 volunteers of both sexes with an age of 50 years or older who had no history of major chronic *** took a Spirulina supplementation for 12 weeks and were administered comprehensive dietary questionnaires to determine their nutritional regimen during the *** cell count(CCC)and indoleamine 2,3-dioxygenase(IDO)enzyme activity,as a sign of immune function,were determined at baseline and weeks 6 and 12 of *** study participants completed the entire study and the data obtained were *** the 12-week study period,there was a steady increase in average values of mean corpuscular hemoglobin in subjects of both *** addition,mean corpuscular volume and mean corpuscular hemoglobin concentration also increased in male *** women appeared to benefit more rapidly from Spirulina ***,the majority of subjects manifested increased IDO activity and white blood cell count at 6 and 12 weeks of Spirulina *** may ameliorate anemia and immunosenescence in older *** encourage large human studies to determine whether this safe supplement could prove beneficial in randomized clinical trials.

关键词： functional food immunosenescence red blood cell IDO

Mixture network autoregressive model with application on students’successes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Mathematics in China 2020年第1期15卷 141-154页

作者： Weizhong TIAN Fengrong WEI thomas BROWN Department of Mathematical Sciences Eastern New Mexico UniversityPortalesNM 88130USA Department of Mathematics University of West GeorgiaCarrolltonGA 30118USA

We propose a mixture network regression model which considers both response variables and the node-specific random vector depend on the *** order to estimate and compare the impacts of various connections on a response variable simultaneously,we extend it into p different types of *** ordinary least square estimators of the effects of different types of connections on a response variable is derived with its asymptotic *** studies demonstrate the effectiveness of our proposed method in the estimation of the mixture autoregressive *** the end,a real data illustration on the students’GpA is discussed.

关键词： Network regression multiple connections heterogeneous dynamic effects

Enabling silicon photoanodes for efficient solar water splitting by electroless-deposited nickel

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 2018年第6期11卷 3499-3508页

作者： Jiheng Zhao thomas Mark Gill Xiaolin Zheng Department of Mechanical Engineering Stanford University Stanford 9430S USA

Enabling Si photoanodes for efficient solar water oxidation would facilitate the development of solar fuel conversion, but it is challenging owing to Si surface passivation via photo-induced corrosion in aqueous electrolytes. To overcome this challenge, most approaches have focused on improving the stability of Si by coating dense and thin protective layers using high vacuum-based techniques such as atomic layer deposition. However, these procedures are costly, making scalability for practical applications difficult. Herein, we report a modified electroless deposition （ELD） method to uniformly deposit protective and catalytic Ni films on Si wafers, resulting in efficient and stable Si photoanodes for solar water oxidation. The optimized Ni/n-Si photoanode achieves an onset potential of -1.09 V vs. a reversible hydrogen electrode and a saturation current density of -27.5 mA/cm^2 under AM 1.5 G illumination at pH 14. The ELD method is additionally capable of Ni deposition on a 4-inch n-Si wafer, demonstrating the first 4-inch Si photoanode. The solar water oxidation of the ELD-Ni/n-Si photoanode can be further improved by surface texturing, built-in n-p junctions, or coupling with more efficient catalysts.

关键词： Ni deposition electroless plating Si photoanode oxygen evolution reaction (OER) photoelectrochemical water splitting

EFFICIENT SIXTH ORDER p-STABLE METHODS WITH MINIMAL LOCAL TRUNCATION ERROR FOR y"=f(x,y)

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 2002年第2期20卷 175-184页

作者： Kai-li Xiang R.M.thomas Department of Computer Science Southwest Petroleum InstituteNanchong 637001China Department of Mathematics UMISTManchesterM60 1 QDUK

A family of symmetric (hybrid) two step sixth p-stable methods for the accurate numerical integration of second order periodic initial value problems have been considered in this paper. These methods, which require only three (new) function evaluation per iteration and per step integration. These methods have minimal local truncation error (LTE) and smaller phase-lag of sixth order than some sixth orders p-stable methods in [1-3,10-11]. The theoretical and numerical results show that these methods in this paper are more accurate and efficient than some methods proposed in [1-3,10].

关键词： second order periodic initial value problems p-stable phase-lag local truncation error

ENVIRONMENTAL IMpACT ASSESSMENT OF LIGHT-FRAME AND TIMBER FRAME STRUCTURES

在线全文

学校读者我要写书评

暂无评论

Journal of Green Building 2014年第2期9卷 102-123页

作者： Brian p.Malone Rakesh Gupta thomas H.Miller Maureen E.puettmann KL&A Structural Engineers and Builders CarbondaleCO. Dept.of Wood Sci.&Eng. Oregon State Univ.CorvallisOR-97331 School of Civil and Construction Engineering Oregon State UniversityCorvallisOR 97331 WoodLife Environmental Consultants LLCCorvallisOR 97330

The objective of this study was to analyze the environmental performance of different wood structural assemblies for residential *** structural systems(a traditional timber frame and a light-frame)were compared together with alternate material options for each *** impacts were determined using the Athena Impact Estimator for Buildings *** alterations for generalization were made to an existing timber frame(TF)structure used as the basis of this analysis,and an equivalent light-frame(LF)structure was designed based on the International Residential Code(IRC).Environmental impacts observed include total energy consumption,fossil fuel consumption,global warming potential(GWp),and wood fiber *** analyses were considered cradle-to-gate,including the manufacturing and construction life-cycle *** show how GWp is linked to both fossil fuel consumption and wood fiber use,and how ultimate environmental impact is driven by energy *** impacts of structures are driven by material choice,and levels of carbon stored in structural wood serve to decrease *** the structural assemblies analyzed,the most traditional TF structure outperformed all other options in almost every measure.

关键词： global warming potential wood structures life cycle analysis carbon storage

保持围手术期体温正常一种减少手术并发症的简单、安全和有效的方法

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

英国医学杂志中文版 2003年第4期6卷 203-204页

作者： Christopher Mark Harper thomas mcnicholas S Gowrie-Mohan 黄宇光 research fellow Centre for Anaesthesia Middlesex Hospital London WIT 3AA consultant urologist. consultant anaesthetist. Lister Hospital Stevenage Hertfordshire SG1 4AB

围手术期低体温的危害尚未引起人们的重视,这种危害包括伤口感染率、心血管并发症和失血量的增加,以及病人的恢复和住院时间延长。而保持病人的体温在36℃或以上是有益的并可节省费用。 Frank等人对接受胸部。

关键词：围手术期体温并发症心血管泌尿科

Structure-property relationships in ILs: A study of the alkyl chain length dependence in vaporisation enthalpies of pyridinium based ionic liquids

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2012年第8期55卷 1525-1531,1-6页

作者： ZAITSAU Dzmitry H. YERMALAYEU Andrei V. EMEL'YANENKO Vladimir N. VEREVKIN Sergey p. WELZ-BIERMANN Urs SCHUBERT thomas Department of physical Chemistry University of Rostock Dr-Lorenz-Weg 1 D-18059 Rostock Germany Evonik Degussa Taiwan Ltd. 133 Minsheng East Road Section Taipei 10596 China 3IoLiTec Ionic Liquids Technologies GmbH Salzstrasse 184 74076 Heilbronn Germany

The enthalpies of vaporization for the series of pyridinium-based ionic liquids with bis（trifluoromethylsulfonyl）imide anion [Cnpy][NTfz] （n = 2, 3, 4, 5, and 6） have been determined with the quartz crystal microbalance technique combined with the Langmuir evaporation. The linear dependence of vaporization enthalpies on the chain length has been revealed. New approach based on volumetric, surface tension, and speed of sound measurements has been developed for estimation of heat capacity differences between gas and liquid phase, which were required for adjustment of measured vaporization enthalpies to the ref- erence temperature 298 K.

关键词： ionic liquids enthalpy of vaporization quartz crystal microbalance structure-property relations

Evaluating the Spatial Uncertainty of Future Land Abandonment in a Mountain Valley(Vicdessos, pyrenees-France): Insights from Model parameterization and Experiments

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2015年第5期12卷 1095-1112页

作者： thomas Houet Laure Vacquié David Sheeren GEODE UMR 5602 CNRS –UT2J Université Toulouse Jean Jaurès Maison de la recherche 5 allées Antonio Machado31058 Toulouse Cedex Dynafor UMR 1201 INRA/INpT-ENSAT Ecole Nationale Supérieure Agronomique de Toulouse Avenue del’Agrobiopole B.P. 32607 - Auzeville-Tolosane 31326 - Castanet-Tolosan Cédex

European mountains are particularly sensitive to climatic disruptions and land use *** latter leads to high rates of natural reforestation over the last 50 years. Faced with the challenge of predicting possible impacts on ecosystem services,LUCC models offer new opportunities for land managers to adapt or mitigate their *** the spatial uncertainty of future LUCC is crucial for the definition of sustainable land use strategies. However, the sources of uncertainty may differ, including the input parameters, the model itself, and the wide range of possible futures. The aim of this paper is to propose a method to assess the probability of occurrence of future LUCC that combines the inherent uncertainty of model parameterization and the ensemble uncertainty of the future based scenarios. For this purpose, we used the Land Change Modeler tool to simulate future LUCC on a study site located in the pyrenees Mountains(France) and two scenarios illustrating two land use strategies. The model was parameterized with the same driving factors used for its calibration. The definition of ‘static vs. dynamic' and ‘quantitative ***(discretized)' driving factors, and their combination resulted in four parameterizations. The combination of model outcomes produced maps of the spatial uncertainty of future LUCC. This work involves adapting the definition of spatial uncertainty in the literature to future-based LUCC studies. It goes beyond the uncertainty of simulation models by integrating the uncertainty of the future to provide maps to help decision makers and land managers.

关键词： Land use Land cover Scenario Model Mountainous reforestation Land abandonment Landmanagement