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71.
72.
A model describing a possible scenario of martensite type phase transformations is examined. A new phase is supposed to nucleate
in the form of plane parallel layers. As the boundary condition, average strains are imposed. Then, the governing parameters
of the two-phase structure are the concentration of new phase layers, their orientation and also the orientation of anisotropy
axes. The parameters depend on the average strains and are determined by the requirement to minimize the average Helmholtz
free-energy function. Once a general procedure has been discussed, average strain–stress diagrams are constructed for two
cases. In the first case, for the simplicity sake, both phases are assumed to be isotropic. In the second case anisotropy
is produced by a non-spherical phase transformation strain tensor. For both cases phase transition zones (PTZs) are constructed.
The PTZ is formed in the space of strains by those which can exist on equilibrium interfaces. Loading and unloading paths,
corresponding to uniaxial stretching and plane stretching/compression, are examined and related with the PTZ. Effects of internal
stresses induced by the nucleation of new phase areas and the anisotropy of new phase are discussed. 相似文献
73.
The effect zones of layer face for RCC (rolled control concrete) dam have gradual change characteristics. Based on the analysis thought of complex material, a model was built to analyze above principle of RCC dam by use of series-wound and shunt-wound connection. Some methods were proposed to determine the instantaneous Young's modulus, delayed Young's modulus and viscosity coefficient of effect zones of layer face. Above models and methods were used to mine the principle of gradual change of key calculation parameters which can response the characteristics of effect zones. The principle of gradual change was described. A model was established to analyze the three-dimensional viscoelastic problem of RCC dam. Above programs were developed. The examples show that the proposed models and methods to determine the key calculation parameters of effect zones can reflect the status of RCC dam accurately. 相似文献
74.
A. G. Kuz’min 《Fluid Dynamics》2006,41(4):629-632
Transonic flow past an airfoil with a small curvature in its midchord region is numerically investigated. The branching of the stationary solutions of the Euler equations is established and attributed to flow instability at certain angles of attack and freestream Mach numbers. The dependence of the lift coefficient on these parameters is studied. 相似文献
75.
Characterization of enamel caries lesions in rat molars using synchrotron X‐ray microtomography 下载免费PDF全文
R. D. Free K. DeRocher S. R. Stock D. Keane K. Scott-Anne W. H. Bowen D. Joester 《Journal of synchrotron radiation》2017,24(5):1056-1064
Dental caries is a ubiquitous infectious disease with a nearly 100% lifetime prevalence. Rodent caries models are widely used to investigate the etiology, progression and potential prevention or treatment of the disease. To explore the suitability of these models for deeper investigations of intact surface zones during enamel caries, the structures of early‐stage carious lesions in rats were characterized and compared with previous reports on white spot enamel lesions in humans. Synchrotron X‐ray microcomputed tomography non‐destructively mapped demineralization in carious rat molar specimens across a range of caries severity, identifying 52 lesions across the 30 teeth imaged. Of these lesions, 13 were shown to have intact surface zones. Depth profiles of fractional mineral density were qualitatively similar to lesions in human teeth. However, the thickness of the surface zone in the rat model ranges from 10 to 58 µm, and is therefore significantly thinner than in human enamel. These results indicate that a fraction of lesions in rat caries possess an intact surface zone and are qualitatively similar to human lesions at the micrometer scale. This suggests that rat caries models may be a suitable analog through which to investigate the structure of surface zone enamel and its role during dental caries. 相似文献
76.
The results of an experimental investigation of the flow past cone-cylinder bodies with small angles of the bend in the body generator at the leading corner edge (θs ≤ 20°) and the available data on the flow past cone-cylinder and segment-cylinder bodies with large angles of the bend in the generator (θs, c ≥ 30°) are generalized. On the basis of these data, the distinctive features of the transonic flow past these bodies and, primarily, the flow restructuring downstream of the leading corner edge at θs ≥ 30° are established and the characteristic gasdynamic parameters are determined. Emphasis is placed on the critical stage of flow restructuring, the nature of the stationary aerodynamic hysteresis, and the effect of the Reynolds number and wave disturbances. 相似文献
77.
During subsurface transport, reactive solutes are subject to a variety of hydrological, physical and biochemical processes. The major hydrological and physical processes include advection, diffusion and hydrodynamic dispersion, and key biochemical processes are aqueous complexation, precipitation/dissolution, adsorption/desorption, microbial reactions, and redox transformations. The addition of strongly reduced landfill leachate to an aquifer may lead to the development of different redox environments depending on factors such as the redox capacities and reactivities of the reduced and oxidised compounds in the leachate and the aquifer. The prevailing redox environment is key to understanding the fate of pollutants in the aquifer. The local hydrogeologic conditions such as hydraulic conductivity, ion exchange capacity, and buffering capacity of the soil are also important in assessing the potential for groundwater pollution. Attenuating processes such as bacterial growth and metal precipitation, which alter soil characteristics, must be considered to correctly assess environmental impact. A multicomponent reactive solute transport model coupled to kinetic biodegradation and precipitation/dissolution model, and geochemical equilibrium model can be used to assess the impact of contaminants leaking from landfills on groundwater quality. The fluid flow model can also be coupled to the transport model to simulate the clogging of soils using a relationship between permeability and change in soil porosity. This paper discusses the different biogeochemical processes occurring in leachate-contaminated soils and the modeling of the transport and fate of organic and inorganic contaminants under such conditions. 相似文献
78.
本文从规划区土地利用状况出发,建立了居民分布的引力模型和概率模型,在规划区就业人口分成就业区就业人口和居住区服务就业人口的基础上,研究了运用模型分布这两种就业人口的方法,并建立分布全部居民的模型,最后给出了模型应用实例. 相似文献
79.
K. S. Shanmukharadhya K. G. Sudhakar 《Journal of Thermal Analysis and Calorimetry》2007,90(1):299-306
It is unfortunately not too rare to find that fire investigators estimate flame temperatures by looking up a handbook value,
which turns out to be the adiabatic flame temperature. Generally, the measurement of temperature in an industrial furnace
is difficult, time consuming and expensive. Combustion of bagasse has its own special set of problems which appear to be due
largely to the high moisture content and varying particle sizes of the fuel. The present experimental investigation is carried
out to estimate the location of reaction zones and temperature fields in a bagasse fired furnace. Furnace is modeled by three
dimensional CFD codes. Both experimental and the computational results show a considerable delay to ignition due to the drying
of fuel. Also the location of maximum temperature zones and the pattern of flame propagation inside the furnace are clearly
indicated. 相似文献
80.