检索结果-南通市图书馆

Effect of substrate temperature on the physical properties of SnS_2:Cu thin films deposited by spray pyrolysis

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2018年第12期39卷 46-51页

作者： m.R.Fadavieslam School of Physics Damghan University

The main impetus of the present study is to investigate thin films of tin disulfide that have been doped with copper impurities and prepared on glass substrates by using the spray pyrolysis technique. Also, the influence of the substrate temperature on the structural, optical, and electrical properties of these films are *** thin films have been characterized by X-ray diffraction(XRD), scanning electron microscopy(SEm), and optical absorption(UV-vis) analyses. The XRD patterns clarify that the thin films possess polycrystalline structures,having a peak associated with the(001) plane of the SnS2 phase. The average crystalline grain sizes were estimated to be within the range 5.7-7.1 nm. The SEm images indicate that the grain size increases from 53 to 114 nm with an increment in the substrate temperature, resulting in an increasing-decreasing trend in the band gap of the thin films. However, the films’ resistance decreases from 92.5 to 0.174 Ω·cm as the substrate temperature increases from 400 to 450 ℃. Also, their optical energy band gap depicts an increasing-decreasing trend with the estimated values of 2.81,3.21, and 3.06 eV at 400, 425, and 450℃, respectively. The thin films exhibit n-type conductivity.

关键词： spray pyrolysis thin film polycrystalline

myocardin in biology and disease

在线全文

学校读者我要写书评

暂无评论

The Journal of Biomedical Research 2015年第1期29卷 3-19页

作者： Joseph m.miano Aab Cardiovascular Research Institute University of Rochester School of Medicine and Dentistry

myocardin （mYOCD） is a potent transcriptional coactivator that functions primarily in cardiac muscle and smooth muscle through direct contacts with serum response factor （SRF） over cis elements known as CArG boxes found near a number of genes encoding for contractile, ion channel, cytoskeletal, and calcium handling proteins. Since its discovery more than 10 years ago, new insights have been obtained regarding the diverse isoforms of mYOCD expressed in cells as well as the regulation of mYOCD expression and activity through transcriptional, post-transcriptional, and post-translational processes. Curiously, there are a number of functions associated with mYOCD that appear to be independent of contractile gene expression and the CArG-SRF nucleoprotein complex. Further, perturbations in mYOCD gene expression are associated with an increasing number of diseases including heart failure, cancer, acute vessel disease, and diabetes. This review summarizes the various biological and patho- logical processes associated with mYOCD and offers perspectives to several challenges and future directions for further study of this formidable transcriptional coactivator.

关键词： gene myocardin in biology and disease SRF

Response of saproxylic insect communities to logging history, tree species, stage of decay, and wood posture in the central Nearctic boreal forest

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2018年第5期29卷 1365-1377页

作者： R.W.James Dennis Jay R.malcolm Sandy m.Smith m.Isabel Bellocq Faculty of Forestry University of Toronto 33 Willcocks St.Toronto ON M5S 3B3 Canada Departamento de Ecología Genética y EvoluciónFacultad de Ciencias Exactas y NaturalesUniversidad de Buenos Aires and IEGEBA (CONICET)Buenos Aires Argentina

Saproxylic insect assemblages are essential functional components of forest ecosystems that can be affected by forest *** used a split-plot ANOVA design to analyze differences in selected saproxylic insects（all arthropod orders and dipteran and parasitic hymenopteran families） emerging from dead wood of sites with different logging histories（horse-logged,mechanically-logged and unlogged）,tree species（Populus and Picea）,stage of decay（early-and late-decay stages） and posture（standing and downed logs） in the boreal forest of central *** clear effects of logging history were seen for the studied taxa; however,interaction between logging history and other dead wood features was *** consistently emerged more from Populus than from Picea dead *** of the studied saproxylic families were more abundant in late-decay than in early-decay *** of the Cecidomyiidae,Ceratopogonidae,Empididae,mycetophilidae and Sciaridae families,and hymenopterans of the Diapriidae and Ichneumonidae families were significantly more abundant in downed than in standing dead *** contrast,mymaridae was most abundant in standing dead *** study provides evidence that some insects at high taxonomic levels respond differently to dead wood quality,and this could inform future management strategies in the boreal forest for the conservation of saproxylic fauna and their ecological functions.

关键词： Boreal forest Dead wood quality Forest harvesting High-level taxa Saproxylic insects

On the Evaluation of Two—Center Overlap Integrals over Integer and Noninteger n—Slater—Type Orbitals

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2002年第6期37卷 711-714页

作者： T.Ozdogan m.Orday 等 DepartmentofPhysics FacultyofEducationOndokuzMayisUniversityAmasyaTurkey

In this study,two-center overlap integrals over Slater-type orbitals (STOs) with integer and noninteger principal quantum numbers in unaligkned coordinate systems have been calculated using formulas for overlap integrals in aligned coordinate systems obtained by the author's previous work (*** and ***,***,Chem.87 (2002) 15).The obtained results for integer case have been found to be in excellent agreement with the prior *** the other hand,to the best of authors knowledge,because of the scarcity of the literatures on the use of noninteger n-STOs in unaligned coordinate systems,the results for noninteger case have been tested with the limit of integer case,and good agreement has been obtained too.

关键词：量子力学重叠积分整数域非整数域

Potential use of durian fruit(Durio zibenthinus Linn) as an adjunct to treat infertility in polycystic ovarian syndrome

维普期刊数据库评论

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 Integrative medicine 2016年第1期14卷 22-28页

作者： Reshma m. Ansari Department of Basic medical Sciences Cyberjaya University College of Medical Sciences Cyberjaya 63000 Selangor Malaysia

Infertility due to polycystic ovarian syndrome （PCOS） is a worldwide problem that is increasing at alarming rates. Insulin resistance, the prime factor of PCOS, induces comorbid metabolic syndrome as well. Durian （Durio zibenthinus Linn）, a fruit of Southeast Asia, is used as a natural supplement in healthy diets. This paper is a short literature review that examines the fruit＇s effects against various components of metabolic syndrome and its fertility-enhancing properties in PCOS. Various published literature was reviewed to learn of the anti-inflammatory, anti-oxidant, anti-obesity, anticholesterol, and antihypoglycaemic nature of the fruit. The literature search was done using Pubmed, Google Scholar and library databases. The keywords used were polycystic ovarian syndrome, infertility, metabolic syndrome and Durian zibenthinus Linn. Reviewed studies showed that the fruit is effective against various components of metabolic syndrome, but the mechanisms of action against anovulation and menstrual disturbances in PCOS have yet to be studied. The traditional use of durian as a fertility-enhancing agent needs to be validated scientifically by isolating its various components and ascertaining its fertility enhancing properties.

关键词： Durian zibenthius Linn polycystic ovarian syndrome infertility metabolic syndrome

A Study of Linke Turbidity Factor over Qena / Egypt

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 1996年第4期13卷 519-532页

作者： Sayed m. Elshazly Department of Physics Faculty of Science South Valley University Qena/A.R. Egypt

Data on instantaneous atmospheric Linke turbidity factor TL (m) are reported for clear days at Qena/Egypt in the period from June 1992 to may ***(m) is determined using the values of irradiance of direct solar radiation (I),which are calculated from global (G) and diffuse (D) - solar radiation *** and seasonally variations of both diurnal and daily average values of TL (m) increases steadily in the direction of sunset in the months from June to December 1992 as well as Summer and Autumn seasons,while it falls generally in this direction for the months from January to march and Winter *** April and may,TL (m) fluctuates obviously through the day hours,it is also shown that the average values of TL(m) are particularly large during Summer months compared to other months of the *** behavior of TL(m) is discussed in view of the variations of some weather elements,which affect the content of water vapor and dust particle in the atmosphere of the study *** seems t be of similar trends to that of other locations inside and outside *** virtual variation of TL(m) is eliminated by reducing its value to relative optical air mass m=2,according to Kasten *** resulting TL (2) is more representative for the content of dust particles and water vapor in the atmosphere.

关键词： Turbidity Linke turbidity factor Seasonal and diurnal variations Solar radiations components measurements Aerosol

multi-layered plate finite element models with node-dependent kinematics for smart structures with piezoelectric components

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2021年第8期34卷 164-175页

作者： Guohong LI Erasmo CARRERA Yuliang HOU Gennady m.KULIKOV mUL2 Group Department of Mechanical and Aerospace EngineeringPolitecnico di TorinoTorino 10129Italy Laboratory of Intelligent materials and Structures Tambov State Technical UniversityTambov 392000Russia School of mechanical and Power Engineering Zhengzhou UniversityZhangzhou 450001China

This article presents a type of plate Finite Element(FE)models with adaptive mathematical refinement capabilities for modeling laminated smart structures with piezoelectric layers or distributed *** p-version shape functions are used in combination with the higher-order Layer-Wise(LW)kinematics adopting hierarchical Legendre ***-Dependent Kinematics(NDK)is employed to implement local LW models in the regions with piezoelectric components and simulate the global substrate structure with the Equivalent Single-Layer(ESL)*** the proposed NDK FE models,the electro-mechanical behavior of smart structures can be predicted with high fidelity and numerical efficiency,and various patch configurations can be conveniently modeled through one set of mesh ***,the effectiveness and efficiency of the NDK FE approach are assessed through numerical examples and its application is demonstrated.

关键词： Finite element Laminated composites Piezoelectric Refined plate theory Smart structures

Evaluation of the wind energy potential of two south west sites in Nigeria

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2012年第3期6卷 237-246页

作者： Olaleye m.AmOO Aeromechanics-Fan Blades Cold Section Engineering(CSE)United Technologies Corporation(UTC)-Pratt&WhimeyEast HartfordCT06108USA

Wind resource assessment is a crucial first step in gauging the potential of a site to produce energy from wind turbines. In this paper, the wind energy potential of Abeokuta （07°03＇N, 03°19＇E） and Ijebu-Ode （06°47＇N, 03°58＇E）, two south west sites in Nigeria were examined. Twenty years （1990-2010） of monthly mean wind data from a 10m height were subjected to two-parameter Weibull analysis and other statistical analyses. The results show that the average annual mean wind speed variation for Abeokuta ranges from 2.2 to 5.0 m/s. For Ijebu-Ode, it ranges from 2.0 to 5.0m/s. The wind power density variation based on the Weibull analysis ranges from 4.26 to 24.51 W/m2 for Abeokuta and from 8.54 to 76.46 W/m2 for Ijebu-Ode. Ijebu-Ode was found to be the better of the two sites in terms of annual variation of mean wind speed.

关键词： wind potential wind speed wind power density wind gust turbulence intensity Nigeria

Using passive cooling strategies to improve thermal performance and reduce energy consumption of residential buildings in U.A.E. buildings

维普期刊数据库评论

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 Architectural Research 2014年第2期3卷 154-165页

作者： Hanan m. Taleb Faculty of Engineering British University in Dubai Dubai 502216 UAE

Passive design responds to local climate and site conditions in order to maximise the comfort and health of building users while minimising energy use. The key to designing a passive building is to take best advantage of the local climate. Passive cooling refers to any technologies or design features adopted to reduce the temperature of buildings without the need for power consumption. Consequently, the aim of this study is to test the usefulness of applying selected passive cooling strategies to improve thermal performance and to reduce energy consumption of residential buildings in hot arid climate settings, namely Dubai, United Arab Emirates. One case building was selected and eight passive cooling strategies were applied. Energy simulation software namely IES was used to assess the performance of the building. Solar shading performance was also assessed using Sun Cast Analysis, as a part of the IES software. Energy reduction was achieved due to both the harnessing of natural ventilation and the minimising of heat gain in line with applying good shading devices alongside the use of double glazing. Additionally, green roofing proved its potential by acting as an effective roof insulation. The study revealed several significant findings including that the total annual energy consumption of a residential building in Dubai may be reduced by up to 23.6% when a building uses passive cooling strategies.

关键词： Passive cooling IES software UAE houses Evaporative cooling Shading devices