Sequencing Batch Reactor (SBR) was used for the wastewater treatment. A new dynamical model was put forward and developed. The substrate in influent was divided into soluble COD and insoluble COD. The soluble COD is f...Sequencing Batch Reactor (SBR) was used for the wastewater treatment. A new dynamical model was put forward and developed. The substrate in influent was divided into soluble COD and insoluble COD. The soluble COD is further subdivided into EBS, DBS and IOM. By dynamical simulation, many advantages appear in the new model. Furthermore, the proper ttf/tc, F/M and sludge age were suggested for the design and operation of SBR system.展开更多
Based on the steady-state solution of finite-state birth and death process, the principle of line configuration for shared multi-channel system is analyzed. Call congestion ratio equation and channel utilization ratio...Based on the steady-state solution of finite-state birth and death process, the principle of line configuration for shared multi-channel system is analyzed. Call congestion ratio equation and channel utilization ratio equation are deduced, and visualized data analysis is presented. The analy-sis indicates that, calculated with the proposed equations, the overestimate for call congestion ratio and channel utilization ratio can be rectified, and thereby the cost of channels can be saved by 2000 in a small system.With MATLAB programming, line configuration methods are provided. In order to generally and intuitively show the dynamic running of the system, and to analyze,promote and improve it, the system is simulated using M/M/n/n/m queuing model and Monte-Carlo method. In addition, the simulation validates the correctness of the theoretical analysis and optimizing configuration method.展开更多
Thermal behavior of integrated passive components has become an important issue when designing these components. This paper presents the thermal modeling of a multilayer integrated LC filter used in DC-DC step-down co...Thermal behavior of integrated passive components has become an important issue when designing these components. This paper presents the thermal modeling of a multilayer integrated LC filter used in DC-DC step-down converter for temperature distribution calculation. The approach used for this analysis is based on thermal equivalent circuit. Temperature distribution is obtained from algebraic equation, which is in vector and matrix form. The results of analytical calculation are compared with simulation results from finite element method. These results showed a good correlation.展开更多
In order to make the use of complex elasto-plastic behavior models more accessible, we attempted to identify the Cam-Clay model in two samples of tropical and lateritic soils (from Senegal/West Africa) from casagrande...In order to make the use of complex elasto-plastic behavior models more accessible, we attempted to identify the Cam-Clay model in two samples of tropical and lateritic soils (from Senegal/West Africa) from casagrande box shear and oedometric tests. This methodology was used as a substitute for triaxial trials. In this article, we first verify the test results by the finite element method with the Optum software. We use a simulation of the tests with the modified Cam Clay model as the behavior model. Then, we simulate the oedometric test on tropical soils with the Castem software and also use the modified Cam Clay model. These calculations make it possible to write the criterion of plasticity of the material starting from the expression of the surface of load while passing by the calculation of the volumetric and deviatoric stresses.展开更多
DEM数据源及分辨率会影响流域特征参数的提取,进而影响水文模拟结果。将ASTER 30 m DEM、SRTM 90 m DEM及基于ASTER 30 m DEM的40 m、50 m、60 m、70 m、80 m、90 m重采样DEM作为HEC-geo HMS模型输入,提取流域特征,采用HEC-HMS模型,以...DEM数据源及分辨率会影响流域特征参数的提取,进而影响水文模拟结果。将ASTER 30 m DEM、SRTM 90 m DEM及基于ASTER 30 m DEM的40 m、50 m、60 m、70 m、80 m、90 m重采样DEM作为HEC-geo HMS模型输入,提取流域特征,采用HEC-HMS模型,以西笤溪流域为研究区域,分析2011年6月和2011年8—9月的两场降雨径流过程中,DEM数据源和分辨率对水文模拟输出的影响。研究结果表明,两次径流模拟结果与实测数据拟合都较好,模型确定性系数都大于0.82,但是单峰的洪水模拟效果总体更好,基于SRTM 90 m的模型确定性系数比基于ASTER 30 m DEM、重采样90 m DEM的模型确定性系数都大。基于重采样DEM的模型确定性系数变化较大,而且与分辨率的变化呈非线性关系。在HEC-HMS的模拟中,基于ASTER 30 m DEM和基于SRTM 90 m DEM的模拟输出结果相对误差相差3%~5%,基于SRTM 90 m DEM和基于重采样90 m DEM的模拟输出结果相对误差相差2%~4%,基于重采样DEM的模拟输出结果相对误差相差最大达到了11%。展开更多
研究部署与任务期间导弹武器系统可用性建模方法与仿真实验设计。阐述了可用性概念,明确了量化指标,构建建模与仿真(modeling and simulation,M&S)一体化框架,利用分层组合的思想,提出了基于体系-实体-行为-状态(system-of-system,e...研究部署与任务期间导弹武器系统可用性建模方法与仿真实验设计。阐述了可用性概念,明确了量化指标,构建建模与仿真(modeling and simulation,M&S)一体化框架,利用分层组合的思想,提出了基于体系-实体-行为-状态(system-of-system,entity,behavior,state,SEBS)的可用性建模方法,即以体系组织集成建模为框架,以变结构实体建模为主体,以可用性为中心的行为建模为支撑,以基于故障与战损的可用状态建模为核心,并对模型的形式化描述展开研究。探讨了仿真实验设计的关键技术,提出基于测试-使用-维修-保障(test,operation,maintain,support,TOMS)的实验空间串联分割方法,并对随机变量建模、仿真优化设计、仿真系统可信度评估进行阐述。仿真结果表明,该分层组合评估方法快捷有效,仿真实验设计合理可行,极大地提高了可用性评估和分析的效率,为精确保障奠定了基础。展开更多
文摘Sequencing Batch Reactor (SBR) was used for the wastewater treatment. A new dynamical model was put forward and developed. The substrate in influent was divided into soluble COD and insoluble COD. The soluble COD is further subdivided into EBS, DBS and IOM. By dynamical simulation, many advantages appear in the new model. Furthermore, the proper ttf/tc, F/M and sludge age were suggested for the design and operation of SBR system.
文摘Based on the steady-state solution of finite-state birth and death process, the principle of line configuration for shared multi-channel system is analyzed. Call congestion ratio equation and channel utilization ratio equation are deduced, and visualized data analysis is presented. The analy-sis indicates that, calculated with the proposed equations, the overestimate for call congestion ratio and channel utilization ratio can be rectified, and thereby the cost of channels can be saved by 2000 in a small system.With MATLAB programming, line configuration methods are provided. In order to generally and intuitively show the dynamic running of the system, and to analyze,promote and improve it, the system is simulated using M/M/n/n/m queuing model and Monte-Carlo method. In addition, the simulation validates the correctness of the theoretical analysis and optimizing configuration method.
文摘Thermal behavior of integrated passive components has become an important issue when designing these components. This paper presents the thermal modeling of a multilayer integrated LC filter used in DC-DC step-down converter for temperature distribution calculation. The approach used for this analysis is based on thermal equivalent circuit. Temperature distribution is obtained from algebraic equation, which is in vector and matrix form. The results of analytical calculation are compared with simulation results from finite element method. These results showed a good correlation.
文摘In order to make the use of complex elasto-plastic behavior models more accessible, we attempted to identify the Cam-Clay model in two samples of tropical and lateritic soils (from Senegal/West Africa) from casagrande box shear and oedometric tests. This methodology was used as a substitute for triaxial trials. In this article, we first verify the test results by the finite element method with the Optum software. We use a simulation of the tests with the modified Cam Clay model as the behavior model. Then, we simulate the oedometric test on tropical soils with the Castem software and also use the modified Cam Clay model. These calculations make it possible to write the criterion of plasticity of the material starting from the expression of the surface of load while passing by the calculation of the volumetric and deviatoric stresses.
文摘DEM数据源及分辨率会影响流域特征参数的提取,进而影响水文模拟结果。将ASTER 30 m DEM、SRTM 90 m DEM及基于ASTER 30 m DEM的40 m、50 m、60 m、70 m、80 m、90 m重采样DEM作为HEC-geo HMS模型输入,提取流域特征,采用HEC-HMS模型,以西笤溪流域为研究区域,分析2011年6月和2011年8—9月的两场降雨径流过程中,DEM数据源和分辨率对水文模拟输出的影响。研究结果表明,两次径流模拟结果与实测数据拟合都较好,模型确定性系数都大于0.82,但是单峰的洪水模拟效果总体更好,基于SRTM 90 m的模型确定性系数比基于ASTER 30 m DEM、重采样90 m DEM的模型确定性系数都大。基于重采样DEM的模型确定性系数变化较大,而且与分辨率的变化呈非线性关系。在HEC-HMS的模拟中,基于ASTER 30 m DEM和基于SRTM 90 m DEM的模拟输出结果相对误差相差3%~5%,基于SRTM 90 m DEM和基于重采样90 m DEM的模拟输出结果相对误差相差2%~4%,基于重采样DEM的模拟输出结果相对误差相差最大达到了11%。
文摘研究部署与任务期间导弹武器系统可用性建模方法与仿真实验设计。阐述了可用性概念,明确了量化指标,构建建模与仿真(modeling and simulation,M&S)一体化框架,利用分层组合的思想,提出了基于体系-实体-行为-状态(system-of-system,entity,behavior,state,SEBS)的可用性建模方法,即以体系组织集成建模为框架,以变结构实体建模为主体,以可用性为中心的行为建模为支撑,以基于故障与战损的可用状态建模为核心,并对模型的形式化描述展开研究。探讨了仿真实验设计的关键技术,提出基于测试-使用-维修-保障(test,operation,maintain,support,TOMS)的实验空间串联分割方法,并对随机变量建模、仿真优化设计、仿真系统可信度评估进行阐述。仿真结果表明,该分层组合评估方法快捷有效,仿真实验设计合理可行,极大地提高了可用性评估和分析的效率,为精确保障奠定了基础。
