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排序方式: 共有133条查询结果,搜索用时 10 毫秒
1.
This work investigates microbially-influenced corrosion (MIC) of stainless steel AISI 316 by two sulphate-reducing bacteria, Desulfovibrio desulfuricans and a local marine isolate. The biofilm and pit morphology that developed with time were analyzed using atomic force microscopy (AFM). Electrochemical impedance spectroscopy (EIS) results were interpreted with an equivalent circuit to model the physicoelectric characteristics of the electrode/biofilm/solution interface. D. desulfuricans formed one biofilm layer on the metal surface, while the marine isolate formed two layers: a biofilm layer and a ferrous sulfide deposit layer. AFM images corroborated results from the EIS modeling which showed biofilm attachment and subsequent detachment over time. 相似文献
2.
A risk analysis tool is developed for computation of the distributions of fire model output variables. The tool, called Probabilistic Fire Simulator (PFS), combines Monte Carlo simulation and CFAST, a two-zone fire model. In this work, the tool is used to estimate the failure probability of redundant cables in a cable tunnel fire, and the failure and smoke filling probabilities in an electronics room during an electronics cabinet fire. Sensitivity of the output variables to the input variables is calculated in terms of the rank order correlations. The use of the rank order correlations allows the user to identify both modelling parameters and actual facility properties that have the most influence on the results. Various steps of the simulation process, i.e. data collection, generation of the input distributions, modelling assumptions, definition of the output variables and the actual simulation, are described. 相似文献
3.
为实现对多风电场联合出力不确定性的精细化建模,提出了计及预测误差动态相关性的多风电场联合出力不确定性建模方法。首先,分析了同区域风电场的出力及出力预测误差动态相关性特征。进一步,针对此特征,引入高维动态藤Copula理论,建立了多风电场预测出力及预测误差的联合分布模型。最终,将以上模型与基于Copula函数的离散卷积法相结合,建立了计及预测误差动态相关性的多风电场联合出力不确定性模型,并以置信区间对多风电场联合出力不确定性进行了离散化表征。仿真结果表明,对比其他模型,所提模型拟合精度更高,拟合过程与预测方法解耦,灵活性更强。 相似文献
4.
This work studies the effects of the drain pn capacitance grading coefficient, duty cycle and supply modulation on the operation
of class E amplifier. The class E operation analysis with a combination of nonlinear and linear output capacitances is revisited
and duty cycle is added to the equations to allow further investigations for optimum class E circuit tuning. The presented
analysis method can be used for synthesis as well, where necessary load components are calculated for a transistor with a
specific grading coefficient both in the output capacitance and in the nonlinear feedback capacitance. Further, the grading
coefficient of the nonlinear output capacitance is varied in the paper while investigating the changes in normalized peak
voltages and harmonics. Drain efficiency, supply-to-amplitude modulation (V
dd
/AM) and supply-to-phase modulation (V
dd
/PM) are studied. It is shown that by varying the device duty cycle, one can scale the optimum load and the level of peak
voltages over the switching device. Also, the choice of grading coefficient affects the drain efficiency, V
dd
/AM and V
dd
/PM behaviour of the class E amplifier. Last, a case study about increasing the efficiency of a class E amplifier with hyperabrupt
output junction capacitance is shown. 相似文献
5.
Simo Kang Biao Zhou Mengcheng Jiang 《International Journal of Hydrogen Energy》2017,42(31):20201-20215
In this paper, the Volume of Fluid (VOF) method for tracking the gas-liquid interface is employed to investigate the carbon dioxide (CO2) behaviors inside the anode of a direct methanol fuel cell (DMFC). The CO2 bubble emergence processes from the catalyst layer (CL) to the gas diffusion layer (GDL) and then to the flow channels are studied with two different strategies. In the first strategy, the CL and GDL are modeled as a uniform porous layer; in the second strategy, they are modeled as a well-ordered-path GDL and a uniform CL. The simulation results show that the second modeling strategy can better capture and match the fundamental phenomena of CO2 bubble formation and evolvement observed from the experiments inside a DMFC anode. 相似文献
6.
Aline Simo Bonex Mwakikunga Bertrand T. Sone Basil Julies Reginaldt Madjoe Malik Maaza 《International Journal of Hydrogen Energy》2014
Mott-type VO2 oxide nanobelts are demonstrated to be effective hydrogen gas sensors at room temperature. These nanobelts, synthesized by hydrothermal process and exhibiting the VO2 (A) crystallographic phase, display room temperature H2 sensitivity as low as 0.17 ppm. The nanobelts (ultralong belt-like) nanostructures could be an ideal system for fully understanding dimensionally confined transport phenomena in functional oxides and for building functional devices based on individual nanobelts. 相似文献
7.
Paudel Deepak Rinta-Paavola Aleksi Mattila Hannu-Petteri Hostikka Simo 《Fire Technology》2021,57(3):1283-1312
Fire Technology - In fire resistance tests, stone wool’s organic matter undergoes exothermic oxidative reactions sustained by external heat, causing mass transfer in the structure. The... 相似文献
8.
We have developed a new method to determine the degree of mixing for a given system. The method assumes knowledge of the locations of all or some studied particles both before and after mixing. The method is scalable and gives comparable results for systems with varying shapes and sizes of the mixing space. It can also be used to determine the mixing of only a part of the space studied. Due to the information needed, the method is best suited for simulations, but in some cases it might be possible to use it with real laboratory experiments. 相似文献
9.
Measurement errors may affect the predictor selection of the linear regression model. These effects are studied using a measurement framework, where the variances of the measurement errors can be estimated without setting too restrictive assumptions about the measurement model. In this approach, the problem of measurement is solved in a reduced true score space, where the latent true score is multidimensional, but its dimension is smaller than the number of the measurable variables. Various measurement scales are then created to be used as predictors in the regression model. The stability of the predictor selection as well as the estimated predicted validity and the reliability of the prediction scales is examined by Monte Carlo simulations. Varying the magnitude of the measurement error variance four sets of predictors are compared: all variables, a stepwise selection, factor sums, and factor scores. The results indicate that the factor scores offer a stable method for predictor selection, whereas the other alternatives tend to give biased results leading more or less to capitalizing on chance. 相似文献
10.
This paper describes work done to improve and validate the capability of fire dynamics simulator (FDS) to predict the dynamics of water mist sprays. Three single orifice and five multi-orifice spray heads are modeled with FDS based on information on the flow-rate, spray angle, operating pressure and experimentally determined particle size distribution. The capability of FDS to predict the drop size, velocity, mist flux and number concentration profiles within the spray cone is assessed. The effects of turbulence modeling on the predictions of the spray dynamics is investigated. The capability of FDS to predict the air entrainment by high-speed water sprays is validated using experiments in rectangular channels with open ends. 相似文献