material properties of al2o3
Báo cáo " Thermoluminescence properties of Li2B4O7 :Cu material " potx
Ngày tải lên :
05/03/2014, 14:20
... temperature of every peak in the glow curve of LBCu does not shift with increasing dose levels This means that all of the glow peaks in the investigated region ought to be of the first- order of TSL ... Dose (Gy) Fig TSL response of the main glow peak versus gamma ray dose 2.5 Evaluation of the kinetic parameters Some selected TSL glow curves of sample after irradiation of different dose levels ... concentration are important parameters which influence TSL properties of the material Figure and show the TSL-response as a function of Cu concentration and sintering temperatures It can be seen...
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electrical and gas - sensing properties of wo3 semiconductor material
Ngày tải lên :
19/03/2014, 16:48
... and Platinum wires The SiO2 was used to add intensity of sensitive material of WO3 , but it did not in¯uence the gas-sensing properties of WO3 -based sensor A Ni±Cd alloy crossing alumina tube ... temperature properties of the sensor shows the characteristic of a typical surface-controlled model [12±14] Electron concentration of WO3 semiconductor is determined mainly by the concentration of stoichiometric ... eects of gas concentration on the sensitivity of sensor at 200°C The oxygen species capture electrons from the material, leading to increasing of the hole concentration and decreasing of the...
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thermal treatment effects on the material and gas-sensing properties of room-temperaturetungstenoxidenanorodsensors
Ngày tải lên :
20/03/2014, 13:11
... times with a slight sacrifice of response This behavior might be explained in the light of the observed material characteristics as stated below The material properties of N2 -annealed films at below ... range of 200–700 ◦ C under the flow conditions of N2 , O2 , Ar or dry air Tungsten oxide films prepared on Si were utilized to characterize their material properties through various methods of analysis ... component consists of W 4f7/2 and W 4f5/2 doublet peaks with the spin-orbit splitting energy of 2.1 eV Fig 6A and B shows W 4f XPS spectra of N2 annealed samples at the two temperatures of 400 and 600...
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chemcal properties of material surfaces - m. kosmulski (marcel dekker, 2001) ww
Ngày tải lên :
04/06/2014, 16:13
... published onsorption properties of materials of interest, and in view of broad spectrum of goals and viewpoints of the authors of the cited publications and of potential readers of this book, it ... sorption properties of the film and they are widely applied in different fields, but they are outof scope ofthis book On the other hand, the surface propertiesof composite materials with external ... dissolution of relatively soluble materials is often sufficiently slow to allow Chapter completion of sorption process before significant amount of the adsorbent is dissolved, moreover, the presence of...
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fracture mechanics of concrete concepts, models and determination of material properties
Ngày tải lên :
24/10/2014, 21:58
... 446.1R-2 MANUAL OF CONCRETE PRACTICE SY NOPSlS In the first o f i t s series of four state -of- the-art reports under preparation, the Committee describes the basic concepts of fracture mechanics ... f the characteristic length for nonlocal continuum models and the strain-softening properties is then examined, and material parameters for modes II and Ill, shear fractures and mixed mode fracture ... devoted t o the effect of reinforcing bars and their bond slip on fracture propagation, and t o fracture of fiber-reinforced concrete Chapter deals with more theoretical problems of modeling systems...
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A comparative study of the biological and physical properties of viscosity enhanced root repair material (VERRM) AND MTA
Ngày tải lên :
15/09/2015, 22:51
... insertion of a root-end filling One of the factors contributing to the success of a root-end surgery is the selection of a suitable root-end filling material The aim of a root-end filling material ... physical properties of Viscosity Enhanced Root Repair Material (VERRM) and MTA Summary The emergence of Mineral Trioxide Aggregate (MTA) as a root-end filling material has generated a lot of interest ... STUDY OF THE BIOLOGICAL AND PHYSICAL PROPERTIES OF VISCOSITY ENHANCED ROOT REPAIR MATERIAL (VERRM) AND MTA PALLAVI UPPANGALA (BDS RGUHS, India) A THESIS SUBMITTED FOR THE DEGREE OF MASTER OF SCIENCE...
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Properties of Convolution
Ngày tải lên :
13/09/2012, 09:49
... operations Chapter 7- Properties of Convolution 127 2.0 a Original signal Amplitude 1.0 0.0 -1.0 FIGURE 7-3 Example of calculus-like operations The signal in (b) is the first difference of the signal ... curve of the form: sin(x)/(x) , is used to separate one band of frequencies from another c Sinc 0.3 Amplitude Amplitude 0.3 0.2 0.1 0.0 -0.1 -20 -15 -10 Sample number Chapter 7- Properties of Convolution ... affect any of the output signal values As shown by the examples in Fig 7-6, the impulse response of a causal system must have a value of zero for all negative numbered samples Think of this from...
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FOAMING PROPERTIES OF PROTEINS.pdf
Ngày tải lên :
16/12/2012, 15:10
... summary of the independent parameters the modified foaming apparatus FOAMING PROPER TIES used far experi- Nature Fixed Diameter Porosity Volume Volume Mass of of sparging disc of sparging disc of ... = Tw Did = = percent of gas initially in 70 ml of foam (gas Flow Rate) - ml/min of nitrogen time to fill the column with foam volume of liquid in the foam initially volume of liquid drained from ... characteristics of protein i.e the foaming capacity of protein and the stability and strength of the foam Foaming ability i.e Gi denotes the amount of gas retained in the foam reflecting the potential of...
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Thermal properties of the vernacular buildings envelopes: the case of the "Sassi di Matera" and "Trulli di Alberobello
Ngày tải lên :
05/09/2013, 14:58
... are characterized with local materials, namely, “Tufo of Matera” for the structures of the "Sassi of Matera," and “Stone of Fasano” for the structures of the "Trulli of Alberobello," they are different ... knowledge of the temperature coefficient of the material of which it is made A single measure allows for the determination of diffusivity, thermal conductivity, and specific heat of the material ... University of Bari in 1979 University Researcher at the of Engines and Energy Institute of the Faculty of Engineering at the University of Bari from 1983 to 1987 Associate professor of Technical...
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Effects of time of heatsetting on the tensile properties of ingeo™ poly (lactic acid) (PLA) fabric
Ngày tải lên :
05/09/2013, 16:10
... Figure Effect of time of heatsetting on the linearity of load extension in weft direction of knitted Ingeo™ Poly (lactic acid) Figure Mean effect of time of heatsetting on the linearity of load extension ... Increasing time of heatsetting had effect on tensile properties of PLA at varying times of 30s to 90s at temperature of 130°C Optimum effect on tensile properties occurred at times of 30 – 45s PLA ... [PLA] Figure Mean [Ā] of effect of time of heatsetting on the tensile extension EM [%] of Ingeo™ Poly (lactic acid) 3.2 Linearity of load extension curve LT [-] The linearity of load extension curve...
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Physicochemical properties of polluted water of river Ganga at Varanasi
Ngày tải lên :
05/09/2013, 16:11
... pH Because most of the chemical and biochemical reaction are influenced by the pH it is of great practical importance The adverse affect of most of the acids appear below and of alkalis above ... growth and activities of microorganism 3.6 Biological Oxygen demand It has been used as a measure of the amount of organic materialism an aquatic solution which support the growth of microorganism ... quality criteria of an aquatic system In the system where rate of respiration and organic decomposition are high ,the DO values remain lower than those of system where the rate of photosynthesis...
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Properties of American Derivative Securities
Ngày tải lên :
18/10/2013, 03:20
... owner of the derivative security should exercise it If he does not, then the seller of the security can immediately consume f Vk ! , + r IE Vk+1jF k ! and still maintain the hedge 6.2 Proofs of ... maintain the hedge 6.2 Proofs of the Properties Let fGk gn=0 be a sequence of non-negative random variables such that each Gk is F k -measurable k Define Tk to be the set of all stopping times satisfying ... Lemma 2.18 Proof: Take Vk Gk for every k Tk to be the constant k Lemma 2.19 The process f 1 + r ,k Vk gn=0 is a supermartingale k Proof: Let attain the maximum in the definition of Vk+1 , i.e.,...
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Static properties of granular materials Philippe Claudin
Ngày tải lên :
01/11/2013, 08:20
... a series of captors), and are thus much noisier 250 Static properties of granular materials F r p h z Fig 14.13 Sketch of the experimental set-up of Reydellet et al for the measure of the pressure ... contact with 246 Static properties of granular materials typically hundreds of grains We start with a review of such experiments performed in different situations (geometry of the pile, the silo ... probably one of the issues that has been at the origin of the interest of many physicists for granular materials [359] The last point of this subsection will be dedicated to the study of the stress...
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Tài liệu Nature and Properties of Micro-organisms doc
Ngày tải lên :
12/12/2013, 17:15
... Formaldehyde increases infectivity Viruses DNA or RNA Shell of protein (capsid) surrounding nucleic acid Classification on basis of nucleic acid DNA viruses: eg Herpes simplex virus (HSV) ... body Varicella zoster virus (VZV) VZV: Chickenpox VZV: Shingles Re-activation of latent infection Suppression of cell mediated immunity Bacteria Unicellular, DNA and RNA Binary No prokaryotes ... (transfer of plasmid DNA) Important bacterial products 1: extracellular polysaccharide CAPSULE condensed, well defined layer closely surrounding the cell contributes to invasiveness of pathogenic...
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Tài liệu Mechanical Properties of Engineered Materials P2 pptx
Ngày tải lên :
23/12/2013, 00:15
... and 2.8(f) These may be thought of as the absence of a plane of atoms (intrinsic stacking faults) or the insertion of rows of atoms that disturb the arrangement of atoms (extrinsic stacking faults) ... time-dependent flow of materials at temperatures greater than $0.3–0.5 of the melting temperature in degrees Kelvin Also, the activation energy, Q, in Eq (2.10) is indicative of the actual mechanism of diffusion, ... approximately 0.3–0.5 of the melting temperature in degrees Kelvin Since the evolution of microstructure is often controlled by diffusion processes, a brief introduction to elementary aspects of diffusion...
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Tài liệu Mechanical Properties of Engineered Materials P1 pptx
Ngày tải lên :
23/12/2013, 00:15
... mechanical properties of materials It is not intended to be a comprehensive review of all the different aspects of mechanical properties; such a task would be beyond the capabilities of any single ... classes of materials Following a brief introduction to materials science and basic strength of materials, the fundamentals of elasticity and plasticity are presented, prior to a discussion of strengthening ... macroscopic level of understanding of structure [Figs 16(a)–(d)] They are often unaware of the atomic and microstructural constituents that can affect the mechanical behavior of materials and of the role...
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Electronic and Optoelectronic Properties of Semiconductor Structures
Ngày tải lên :
24/01/2014, 17:34
... University of Michigan, Ann Arbor He has held visiting positions at the University of California, Santa Barbara and the University of Tokyo He is the author of over 250 technical papers and of seven ... that allow modifications of electronic properties; use of alloys, quantum wells, strain and polar charge are discussed; iii) electron (hole) transport and optical properties of semiconductors and ... technique involves a charge of material loaded in a quartz container The charge may be composed of either high quality polycrystalline material or carefully measured quantities of elements which make...
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