1introduction specificity of high temperature use of porous materials in foundry applications
Biomimetic synthesis of hybrid materials for potential applications
... inquisitive nature of human mind resulted in many rewarding innovations which eventually led to the age of industrialization of the world The extensive use of chemicals for various purposes in ... adsorption of anionic pollutants.201 Higher temperature usually enhances the adsorption capacity of many adsorbents by increasing surface activity and kinetic energy of the adsorbate, but increase in temperature ... Decarboxylation/elimination of carboxyl group, deamination/elimination of amine Chemical modification 18 inhibiting groups group Graft polymerization High energy radiation grafting(using gama irradiation,...
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Optical and electrical studies of silicon nanowires in photovoltaic applications
... possibility of integrating MEG into the carrier generation mechanism of SiNW PV devices It aims at fabricating an array of ultra-thin SiNWs in which MEG phenomenon could be detected In Chapter ... data of SiNW surface and planar Si surface, measured using integrating sphere (b) Reflected spectral irradiance of SiNW surface comparing with that of planar Si surface; the inset shows incident ... one of the most important quests for generations In the light of recent events such as diminishing fossil fuel supplies, surge in oil prices and an increasing awareness of effect of greenhouse...
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Báo cáo hóa học: " Self-propagating high-temperature synthesis of nano-TiCx particles with different shapes by using carbon nano-tube as C source" doc
... Graduate Innovation Fund of Jilin University Author details Key Laboratory of Automobile Materials, Ministry of Education, People’s Republic of China 2Department of Materials Science and Engineering, ... ignited easily because of the high activity of the CNT In fact, in our following study, by using CNT as C source, we have successfully in situ synthesized the TiCx nanoparticles in 97 wt.% Cu matrix, ... difference in the combustion temperature in these systems, of course, will have an important influence on the shape and size of the synthesized TiCx particles As indicated in Figure 2, with increasing...
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Báo cáo hóa học: " Study of the formation processes of gold droplet arrays on Si substrates by high temperature anneals" docx
... during sample heating Conclusions In this study, the detailed investigations of the peculiarities of the formation of the arrays of gold islands in the course of high temperature anneals of Si ... formation of individual gold islands is not observed at any rate up to the temperature of 950°C (see Figure 5) Instead, the individual intergrain boundaries often form joints 120°j for the mentioned temperatures, ... threshold temperature of about 800°C Besides, a nonlinear increase in the oxygen contents in the subsurface layers was observed with the increase of RTA temperature (by a factor of for the temperature...
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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
... 0.213 Interaction factor(s) A10 DryingTemp DryingTime TemperingTime DryingTemp*DryingTime DryingTemp*TemperingTime DryingTime*TemperingTime DryingTempt*DryingTime*TemperingTime OM2717 DryingTemp ... OM2717 DryingTemp DryingTime TemperingTime DryingTemp*DryingTime DryingTempt*TemperingTime DryingTime*TemperingTime DryingTemp*DryingTime*TemepringTime BF Fissured kernels: Drying temperature and ... design, consisting of two levels of drying temperature (80 and 900C), two levels of drying time (2.5 and 3.0 min) and four levels of tempering time (0, 30, 40, and 60 min), was chosen in this experiment...
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Báo cáo hóa học: " High-Temperature Stable Operation of Nanoribbon Field-Effect Transistors" pot
... constant for temperatures in the range from 25 to 150°C An approximately constant level on-state was maintained in spite of the temperature variation However, the maximum leakage current in the off state ... variation of the current level or mobility can make the device difficult to use in high- temperature or temperature- variable ambient applications To overcome such a thermal problem, which may result in ... characteristics of the fabricated (solid lines) and simulated (dashed lines) nanoribbon FET structures The current level decreases as the temperature increases, which is ascribed mainly to the in uence of...
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Báo cáo hóa học: " Use of Ionic Liquid in Fabrication, Characterization, and Processing of Anodic Porous Alumina" pot
... dotted line: same conditions as in Fig 1a (i.e., with cooling and without stirring) but the 10-fold diluted EL Dashed line: RT, no stirring Continuous line: RT, stirring Thick line: cooling, no ... improvement in h obtained in the considered time period tend on increasing J in bare oxalic acid resulted in a maximum (non-linear) mean growth rate vmax = hcrit/tcrit * 0.83 lm/min (obtained for ... rate of the pores and the diffusion rate of the ions involved in the chemical reactions of the anodization (namely the incoming O2- and the outcoming Al3?, with respect to the anode) Since in first...
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Báo cáo hóa học: " Self-organization of quantum-dot pairs by high-temperature droplet epitaxy" pptx
... hand, in our approach we used high- temperature to encourage material redistribution In this way we can fabricate novel semiconductor nanostructures by taking advantage of the shape instability of ... temperatures, the evolution of QD pairs is observed during subsequent annealing The dramatic change in shape is caused by the anisotropy nature of surface diffusion and incorporation High- temperature droplet ... nearfield scanning optical microscopy Such studies will be reported in the near future In summary, by forming Ga droplets and converting them into GaAs nanostructures at relatively high temperatures,...
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Handbook of High-Temperature Superconductor Electronics doc
... techniques for high- Tc thin-film fabrication are described in Chapter Readers interested in knowing the advancements in high- Tc film fabrication will find it very interesting and informative Chapters ... cell are missing in the [100] direction, thus giving (Cu–O) chains in the [010] direction The Ba atom has a coordination number of 10 oxygen atoms instead of 12 because of the absence of oxygen ... superconducting state in high- Tc superconductors consisted of paired electrons or of something else One way to find out is by measuring a trapped flux in the high- Tc superconducting ring Gough...
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Báo cáo vật lý: "TEMPERATURE DEPENDENCE OF RAMAN SPECTRA OF POROUS GAP" docx
... line-width and asymmetry are functions of the dimension of the nanocrystal The increasing in temperature introduced perturbations in the harmonic potential term The changes in the line-width of ... phonon Raman can be used to estimate an indirect lifetime of strong interacting optical phonons The purpose of this paper is to examine the effects of confinement and temperature- induced charges ... structures The softening and broadening of the optical phonon line in the Raman spectrum also explains the reduction of the coherence length of phonons The Raman studies of nanocrystals provide information...
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Báo cáo vật lý: "PHONON SPECTRA OF HIGH TEMPERATURE SUPERCONDUCTOR Bi2Sr2Ca2Cu3O10: THEORY AND EXPERIMENT" potx
... useful for the theoretical interpretation of Raman and infrared spectra at the center of Brillouin zone in high temperature superconductors REFERENCES Cardona, M., Genzel, L., Liu, R., Wittlin, ... range forces leading to the broadening of the spectral line The weak Raman lines at 640 and 680 cm–1 are due to oxygen related vibrations in BiO plane The intensity of the lines is very much ... description of the vibrational modes In this method, non central forces such as those involved in angle bending can be readily used In this method the frequency of the normal vibration is determined...
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High Temperature Strain of Metals and Alloys Part 1 ppt
... Characteristics of Strain of Metallic Materials at High Temperatures The deformation of a metal specimen begins with the application of a load There are two kinds of high- temperature strain, namely, ... 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 ... Dislocations inside Subgrains 35 Vacancy Loops and Helicoids 39 Total Combination of Structural Peculiarities of High- temperature Deformation 40 Summary 41 Physical Mechanism of Strain at High Temperatures...
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High Temperature Strain of Metals and Alloys Part 2 pptx
... structural investigation and detailed proofs of correctness of physical models An in situ investigation of metals is necessary in order to address the problem of the physics of the high- temperature ... calculation: Iin fin µ (2.13) = Id µ + gin fin Q Iin fin (µ + gT fT Q) = IT fT (µ + gin fin Q) (2.14) The order of calculation is as follows First values of gin , gT are calculated In order to ... irradiated and initial intensities make it possible to determine the dimensions of the reflecting crystal According to the classical theory of Darvin [14] the decrease in intensity factors of irradiation...
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High Temperature Strain of Metals and Alloys Part 3 pdf
... for different metals show convincingly that the formation of jogs takes place during high- temperature deformation Assuming that the kinks and bends in dislocation lines are produced by jogs we ... external conditions (temperature 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 ... stresses The rate of steady strain increases from × 10−7 to × 10−6 s−1 The change in stress leads to a sharper increase in η and decrease in D The values of the structural parameters in this metal...
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High Temperature Strain of Metals and Alloys Part 4 ppsx
... decrease in the vibration amplitude under the influence of solution atoms of Al, Cr, and W in nickel results in an increase in the values of Ev and Uv This causes a decrease in the values of ε The ... are cosines of angles between the respective axes Averaging the product of the cosines over all orientations of the new coordinate system and finding the average value of the function of two ... generation of vacancies in the volume (Ev ), diffusion of vacancies in the volume (Uv ), transition of vacancies in the dislocation “tube” Uvd , diffusion of vacancies in the “tube” Ud , joining the...
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High Temperature Strain of Metals and Alloys Part 5 pdf
... Mechanism of Strain at High Temperatures Fig 4.13 The same as in Fig 4.12, but at temperature 0.68 Tm From our point of view, in metals with little stacking fault energy, the climb of the dislocation ... components of dislocations to climb The immediate cause of the formation of dislocation walls is the interaction between dislocations of the same sign resulting in a decrease in the internal energy of ... function of distance On the left: z/λ = const, on the right: x/λ = const 59 60 Physical Mechanism of Strain at High Temperatures The curves have singularities at x = Within the sub-boundary (in the initial...
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High Temperature Strain of Metals and Alloys Part 6 doc
... than that of V The jog spacing in mobile dislocations decreases when the strain increases, as in reality A decrease in λ correlates with a decrease in the V value The strain rate of the specimen ... dislocation spacing A preliminary decreased value of 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 ... Phase in Superalloys The high- temperature strength requirements of materials have increased with new developments in engine design The continual need for better fuel efficiency has resulted in faster-spinning,...
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High Temperature Strain of Metals and Alloys Part 7 pot
... because we have used the results of measurements of the particle sizes and the data of the strain rate tests 99 100 High- temperature Deformation of Superalloys Finally, the minimum strain rate of ... stage of the tertiary, accelerating creep the shape of the particles becomes irregular A rafting process of the γ structure occurs because of development of diffusion coarsening Now the incoherent ... ε1 is the initial strain rate at 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...
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High Temperature Strain of Metals and Alloys Part 8 docx
... influence of the applied stress The loading results in an increase in the subgrain misorientations and a decrease in subgrain size in the matrix The moving dislocations cut the particles during ... turbine applications in the 1970s and 1980s Single-grained castings replaced polycrystalline moldings for some engines with a view to avoiding slip and fracture along grain boundaries The single-crystal ... amplitudes of the atom vibrations in the hardening phase the higher the creep strength of a superalloy Methods of prediction of the properties of new superalloys are being developed on the basis of integrated...
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