roots and high temperature
Báo cáo hóa học: " Self-assembled GaInNAs/GaAsN quantum dot lasers: solid source molecular beam epitaxy growth and high-temperature operation" pptx
Ngày tải lên :
22/06/2014, 22:20
... the bandgap and lattice matching to GaAs [3–6] Figure shows the relationship between the lattice constant and bandgap energy in III–V alloy semiconductors, taking into account the significant bandgap ... GaInNAs materials grown on GaAs substrate for realizing lowcost, high- performance and high- temperature laser diodes in the 1.3 lm and 1.55 lm wavelength region So far, GaInNAs QW laser performance ... performance with high temperature operation up to 65 °C, high T0 of 79.4 K, and low Jth of 1.05 kA/ cm2 Though these results are still inferior compared to their GaInNAs QW counterparts [3–19] and In(Ga)As...
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BS 845 1 1987 assessing thermal performance of boilers for steam, hot water and high temperature
Ngày tải lên :
28/09/2014, 23:11
... drafting of the standard, through sub-committees and panels: This British Standard, having been prepared under the direction of the Refrigeration, Heating and Air Conditioning Standards Committee, ... and a simple circuit for water, steam or high temperature heat transfer fluid, and that not condense moisture out of the flue gases NOTE The titles of the publications referred to in this standard ... Steam pressure and feed water temperature or, for hot water boilers, the flow and return temperatures, together with the relevant flow rates, shall be held as steady as possible and at levels...
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Constitutive behavior of bulk metallic glass composites at ambient and high temperatures
Ngày tải lên :
09/09/2015, 10:06
... Application Field High strength High hardness High fracture toughness High impact fracture energy High fatigue strength High elastic energy High corrosion resistance High wear resistance High reflection ... 2000) Plastic deformation at room temperature and high stress occurs in a few localized shear bands associated with inhomogeneous flow Deformation at high temperature and low stress is homogeneous, ... shear bands (Lewandowski and Greer, 2006; Wright et al., 2001) Nevertheless, the conclusion is that the temperature increase is a consequence of, and not the cause of shear band formation (Lewandowski...
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Báo cáo khoa học: Hyperthermophilic enzymes ) stability, activity and implementation strategies for high temperature applications pot
Ngày tải lên :
07/03/2014, 05:20
... of thermophilic and mesophilic proteins at room temperature and increases with temperature, so as to allow for enzymatic activity near 100 °C It is only upon achieving these high temperatures that ... increased yields when the reaction is performed at high temperatures; (e) the reactions kinetics are faster at high temperatures; (f) enzymatic processing at temperatures near or above 100 °C minimizes ... hydrophilicities and charges at given environmental conditions, such as temperature, concentration, ionic strength and pH Thus, the diverse chemical and physical properties of proteins and surfaces...
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Research for Agricultural Sciences:" Effect of high temperature fluidized drying and tempering on head rice yield and mechanical strength of Vietnamese rice varieties " doc
Ngày tải lên :
21/06/2014, 06:20
... time on HRY at drying temperature of 800C and 900C for 2.5 and 3.0 Reference HRYs of A10 and OM2717 were 54.5% and 43.26%, respectively (triangular dot) 84 Table Main effects and interaction effects ... the low temperature drying at 35oC, the mechanical strength of the rice kernels was higher at high temperature drying (Table 2, Figure 8) This value was significantly higher at 90oC drying temperature ... fissures) and chalky grains had lower mechanical strength than the unbroken kernels 88 Table 2: Mechanical breaking strength of low temperature (35oC) and high temperature dried rice (dried for 2.5 and...
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báo cáo khao học 'effect of high temperatures on cone opening and on the release and viability of pinus pinaster and p. radiata seeds in nw spain'
Ngày tải lên :
30/06/2014, 05:04
... fires and demonstrate different degrees of serotiny: low in P pinaster and high in P radiata MATERIALS AND METHODS 2.1 Experimental design To carry out this experiment we selected mature and apparently ... gradually increased exposure times and reduced temperatures until relatively low temperatures and long residence times were reached The following combinations of temperature- exposure were tested: ... and the open scales were counted on the following day Prior to this, we tested different combinations of temperatures below 200 ºC and over prolonged periods and checked that the P pinaster and...
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Báo cáo vật lý: "PHONON SPECTRA OF HIGH TEMPERATURE SUPERCONDUCTOR Bi2Sr2Ca2Cu3O10: THEORY AND EXPERIMENT" potx
Ngày tải lên :
07/08/2014, 14:20
... High Temperature Superconductor 56 pelletized and heated till the reaction was complete and a good homogeneity is ensured Appropriate amount of the matrix and BiO3 were mixed and pelletized and ... normal-mode vibrations have been carried out for the high temperature superconductors and the assignment of specific modes are looked into for the clear understanding of the superconducting mechanism This ... modifications for computing the G and F matrices (G-MAT sets up the kinetic energy matrices G and FPERT evaluates the potential constants F and defines vibrational frequencies) and for adjusting a set...
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Báo cáo lâm nghiệp: "Effects of high temperatures and ash on seed germination of two Iberian pines (Pinus nigra ssp salzmannii, P sylvestris var iberica)" pps
Ngày tải lên :
08/08/2014, 18:21
... positiare vely stimulated by high temperatures as many Mediterranean shrubs, such as Cistaceae and Leguminosae (Vuillemin and Bulard, 1981; Troumbis and Trabaud, 1986; Trabaud and Oustric, 1989b; Corral ... via the phytochrome system (Thanos and Skordilis, 1987) This is also true for P nigra and P sylvestris (Orlandini and Malcoste, 1972; Toole, 1973; Orlandini and Bulard, 1975) This clearly indicates ... considered at three levels: control and two ash solution: 10 g/L and 20 g/L Ash (completely burnt material) was obtained from P sylvestris and P nigra branches and leaves and the ash solution used to...
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High Temperature Strain of Metals and Alloys Part 1 ppt
Ngày tải lên :
10/08/2014, 12:21
... of Strain at High Temperatures Physical Model and Theory 43 Velocity of Dislocations 45 Dislocation Density 49 Rate of the Steady-State Creep 51 43 High Temperature Strain of Metals and Alloys, ... at high temperatures and is also of great interest for materials science research and practical applications Mechanical tests were historically the first method of investigating the high- temperature ... Properties 111 Deformation at Lower Temperatures 116 Deformation at Higher Temperatures 124 On the Composition of Superalloys 129 Rafting 130 Effect of Composition and Temperature on γ/γ Misfit Other...
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High Temperature Strain of Metals and Alloys Part 2 pptx
Ngày tải lên :
10/08/2014, 12:21
... difference between values Qin and QT because the increase in temperature influences Q and the fraction in Eq (2.9) in opposite directions Measurements of Iin and Id as well as Iin and IT are performed ... determined by the X-ray method at high temperatures Pure metals, solid solutions and nickel-based superalloys have been studied 25 Structural Parameters in High- Temperature Deformed Metals 3.1 ... angle ω of the crystal rotation and the two angles, 2θ and ψ, of the detector motion Angles ω and 2θ are measured in the equatorial (horizontal) plane of the goniometer and angle ψ in the meridianal...
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High Temperature Strain of Metals and Alloys Part 3 pdf
Ngày tải lên :
10/08/2014, 12:21
... seen well in Figs 3.4 and 3.5 27 28 Structural Parameters in High- Temperature Deformed Metals Fig 3.5 Structural parameters versus time and creep curve for copper Tests at temperature T = 610K ... vacancy loops and helicoids: (a), (b) Iron tested at T = 973K and σ = 10MPa; ×46 000 (c) Niobium tested at T = 1508K and σ = 17.3MPa; ×39 000 39 40 Structural Parameters in High- Temperature Deformed ... and stress) The substructure formation during high- temperature strain in vanadium is shown in Figs 3.6 and 3.7 The data are obtained at the same temperature 0.6 Tm , but under different stresses...
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High Temperature Strain of Metals and Alloys Part 4 ppsx
Ngày tải lên :
10/08/2014, 12:21
... Mechanism and Structural Model of Strain at High Temperatures 4.1 Physical Model and Theory It follows from the obtained data that complex processes occur in the crystal lattice at high- temperature ... distinguishing feature of the high- temperature strain Fig 4.1 The physical model of the steady-state strain at high temperature The sub-boundaries are built of two systems: the pure screw and the 60◦ -dislocation ... generate vacancies; , , : jogs absorb vacancies and : 673; and : 873; and : 1073K 4.3 Dislocation Density Fig 4.5 The effect of temperature, stress and distance between jogs on the velocity of...
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High Temperature Strain of Metals and Alloys Part 5 pdf
Ngày tải lên :
10/08/2014, 12:21
... heat-resistant metals, steels and alloys operate at temperatures between 0.40 and 0.75 Tm The area of temperature and stress where the proposed mechanism of hightemperature deformation takes ... Herring-Nabarro) at higher temperatures and relatively lower stresses It is necessary to emphasize that an adequate understanding of dislocation processes in these ranges of temperature and stress is ... significance in the process of hightemperature strain for pure metals and solid solutions The upper stress limit of the sub-boundary stability depends upon the metal properties and temperature The lower...
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High Temperature Strain of Metals and Alloys Part 6 doc
Ngày tải lên :
10/08/2014, 12:21
... most important requirements is resistance to high- temperature deformation This has created a need for alloys that can withstand higher stresses and temperatures for the hot zones of modern gas ... for high- temperature applications The solubility of the γ phase is dependent on temperature This dependence has been studied in [31] using a high resolution triple crystal diffractometer and high ... λ and increased value of D lead to the strain rate decreasing when the applied stress is relatively low 81 83 High- temperature Deformation of Superalloys 6.1 γ Phase in Superalloys The high- temperature...
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High Temperature Strain of Metals and Alloys Part 7 pot
Ngày tải lên :
10/08/2014, 12:21
... the temperature T1 and ε2 is the final strain ˙ ˙ rate at temperature T2 This method has an essential drawback: an instability of structure during the temperature change results in too high ... the rafting of particles occurs and the deforming dislocations can bow between the obstacles This results in accelerating tertiary creep and rupture 93 94 High- temperature Deformation of Superalloys ... particles and then cut them Hence, the thermally activated overcoming of particles is the process that controls the constant strain rate However, under the effect of applied stress and high temperature...
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High Temperature Strain of Metals and Alloys Part 8 docx
Ngày tải lên :
10/08/2014, 12:21
... increase 107 108 High- temperature Deformation of Superalloys Fig 6.21 Predicted and actual relation between creep rupture stress for IN939 superalloy and its rupture life, tr Temperature of tests ... 110 High- temperature Deformation of Superalloys In a phase of type B3 A (Ni3 Al) Ti atoms occupy places in sublattice A Cr, Fe and Co atoms are located mostly in sublattice B Atoms of Mo, Nb and ... strongly dependent on the temperature and the stress loading conditions It is appropriate to distinguish between two temperature areas, where the superalloys are really used and tested A difference...
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High Temperature Strain of Metals and Alloys Part 9 potx
Ngày tải lên :
10/08/2014, 12:21
... superalloys which must withstand high stresses at temperatures from 1273 to 1373K (GMSX-4, GMSX-10, TMS-138, Rene N6 and others) The reason for the positive influence of the Re and Ru additions has not ... found with a γ fraction as high as 60 to 75% 7.5 Rafting At temperatures above 1273K the γ morphology becomes unstable Under the combined influence of high temperature and centrifugal stresses ... population of a/2 < 112 > dislocations has become established and if the shear stress is sufficiently high The addition of rhenium and ruthenium and the ageing heat treatment have an important effect...
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High Temperature Strain of Metals and Alloys Part 11 docx
Ngày tải lên :
10/08/2014, 12:21
... carbide possesses the highest melting point Tungsten–rhenium–hafnium carbide alloys seem to be promising for operation at high temperatures Fig 8.11 Effect of annealing temperature on applied ... their high melting points They look very promising from the practical point of view The most refractory metals have, however, drawbacks such as poor low -temperature fabricability and an extreme high- temperature ... high- temperature oxidizability When used they need a protective atmosphere or a coating The minimum strain rate of niobium and molybdenum is dependent exponentially on the applied stress at high temperatures...
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High Temperature Strain of Metals and Alloys Part 12 docx
Ngày tải lên :
10/08/2014, 12:21
... and Diffusion in Solids, Elsevier, Amsterdam, 1980 23 K Momma, H Suto, H Oikawa, Relation between high- temperature creep and diffusion in nickel base solid solutions, 3: Diffusion nickel-63 and ... 116–120, 124, 125 – at higher temperatures 124 – at lower temperatures 116 – dislocation splitting 112, 120–122, 129 – equations 99, 100 – influence of orientation, temperature and stress 111–120 ... high temperature, Acta Mater 1999, 47 (12), 3367–3381 42 N Matan, D.C Cox, P.Carter, M.A Rist, C.M F.Rae, R.C Reed, Creep of CMSX-4 superalloy single crystals: effects of misorientation and temperature, ...
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Báo cáo y học: "Genomic and proteomic adaptations to growth at high temperature" potx
Ngày tải lên :
14/08/2014, 14:21
... correlation between the G+C content of structural RNAs and growth temperature, and that the high G+C content was concentrated in the double-stranded stem regions of the molecule This provides strong ... genomic GC content and optimal growth temperature What about thermophilic eukaryotes? The ability to grow at high temperature is relatively common among archaeal species, and several thermophilic ... thermophilic because of the susceptibility of their mRNA to degradation at high temperature [52], and growth at very high temperatures may also require the presence of special lipids that are not...
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