The paper has selected major evaluation indexes and established an evaluation system for highway landscape by taking Harbin-Daqing Highway for example,introducing the studied road section,using the latest researches o...The paper has selected major evaluation indexes and established an evaluation system for highway landscape by taking Harbin-Daqing Highway for example,introducing the studied road section,using the latest researches on domestic and foreign highway landscape design and evaluation for reference,and based on relevant materials,field survey and opinions of experts,scholars,drivers,passengers,constructors and managers.Through the evaluation by fuzzy math method based on AHP,it has obtained the fuzzy value of each index of Harbin-Daqing Highway landscape system.Furthermore,by combining with the weights of landscape quality indexes,a judgment matrix has been constructed.Then,based on the weight and single factor judgment matrix,the conclusion vector of the first level of evaluation criteria has been obtained,and the conclusion vector of the second level of evaluation criteria obtained,similarly.In line with maximal subordinate degree,a comprehensive judgment has been conducted on landscape quality of Harbin-Daqing Highway,and it is considered that its landscape quality is general.展开更多
In order to address the complex uncertainties caused by interfacing between the fuzziness and randomness of the safety problem for embankment engineering projects, and to evaluate the safety of embankment engineering ...In order to address the complex uncertainties caused by interfacing between the fuzziness and randomness of the safety problem for embankment engineering projects, and to evaluate the safety of embankment engineering projects more scientifically and reasonably, this study presents the fuzzy logic modeling of the stochastic finite element method （SFEM） based on the harmonious finite element （HFE） technique using a first-order approximation theorem. Fuzzy mathematical models of safety repertories were introduced into the SFEM to analyze the stability of embankments and foundations in order to describe the fuzzy failure procedure for the random safety performance function. The fuzzy models were developed with membership functions with half depressed gamma distribution, half depressed normal distribution, and half depressed echelon distribution. The fuzzy stochastic mathematical algorithm was used to comprehensively study the local failure mechanism of the main embankment section near Jingnan in the Yangtze River in terms of numerical analysis for the probability integration of reliability on the random field affected by three fuzzy factors. The result shows that the middle region of the embankment is the principal zone of concentrated failure due to local fractures. There is also some local shear failure on the embankment crust. This study provides a referential method for solving complex multi-uncertainty problems in engineering safety analysis.展开更多
Math Works近日推出Robotics System Toolbox（机器人系统工具箱），这个新产品是Release 2015a的组成部分。、通过即用型算法和用于开发自动移动机器人应用程序的硬件连接性，Robotics System Toolbox提供了常用的机器人算法，以及MAT...Math Works近日推出Robotics System Toolbox（机器人系统工具箱），这个新产品是Release 2015a的组成部分。、通过即用型算法和用于开发自动移动机器人应用程序的硬件连接性，Robotics System Toolbox提供了常用的机器人算法，以及MATLAB和Simulink与机器人操作系统（ROS）之间的接口和集成。现在，机器人研究人员和工程师们可以在单个统一的设计环境中开发机器人算法，在支持ROS的机器人和机器人仿真器（如Gazebo和V—REP）上测试和部署机器人算法。它通过减少从MATLAB程序转换到ROS程序所需的手动修改时间，留出了更多的时间来测试和调试算法。展开更多
MathWorks推出了全新的LTE System Toolbox，为LTE和LTE—Advanced无线通信系统和设备提供了与标准兼容的仿真、验证和分析功能。此工具箱是MATLAB和Communications System Toolbox的扩展，目标用户针对需要设计或验证无线设备是否符合...MathWorks推出了全新的LTE System Toolbox，为LTE和LTE—Advanced无线通信系统和设备提供了与标准兼容的仿真、验证和分析功能。此工具箱是MATLAB和Communications System Toolbox的扩展，目标用户针对需要设计或验证无线设备是否符合LTE标准的工程师。展开更多
Not long after the establishment of the People's Republic of China in 1949 and the founding of the CAS, when the whole country was still suffering from the wounds of the three-year civil war, a preparatory off... Not long after the establishment of the People's Republic of China in 1949 and the founding of the CAS, when the whole country was still suffering from the wounds of the three-year civil war, a preparatory office for founding the new Institute of Mathematics opened in June 1950. Theoffice was located at No.3 Wenjin Street, in downtown Beiiing.……展开更多
The process of turning forest area into land is known as deforestation or forest degradation. Reforestation as a fraction of deforestation is extremely low. For improved qualitative and quantitative classification, we...The process of turning forest area into land is known as deforestation or forest degradation. Reforestation as a fraction of deforestation is extremely low. For improved qualitative and quantitative classification, we used Sentinel-1 dataset of State of Para, Brazil to precisely and closely monitor deforestation between June 2019 and June 2023. This research aimed to find out suitable model for classification called Satellite Imaging analysis by Transpose deep neural transformation network (SIT-net) using mathematical model based on Band math approach to classify deforestation applying transpose deep neural network. The main advantage of proposed model is easy to handle SAR images. The study concludes that SAR satellite gives high-resolution images to improve deforestation monitoring and proposed model takes less computational time compared to other techniques.展开更多
目的研究腺病毒携带Math1-EGFP基因经完整圆窗膜途径及鼓阶打孔途径导入耳蜗后对听功能和转导效率的影响,为内耳基因治疗提供实验基础和理论依据。方法健康成年白色红目豚鼠40只,雌雄不限,体重250～300g。随机分成四组,完整圆窗膜组12只...目的研究腺病毒携带Math1-EGFP基因经完整圆窗膜途径及鼓阶打孔途径导入耳蜗后对听功能和转导效率的影响,为内耳基因治疗提供实验基础和理论依据。方法健康成年白色红目豚鼠40只,雌雄不限,体重250～300g。随机分成四组,完整圆窗膜组12只,鼓阶打孔组12只,各组分别设对照8只。实验组(24只)导入重组腺病毒携带的Math1基因及增强型绿色荧光蛋白基因(enhanced green fluorescent protein,EGFP),对照组(16只)导入人工外淋巴液,所有动物均以左耳作为导入耳。术前及术后分别行听性脑干反应(ABR)检查。分别于术后5天、14天取双侧耳蜗标本做基底膜铺片观察基因表达情况。结果完整圆窗膜组导入耳ABR阈值,术后5天各频率与术前比较无显著性差异(P>0.05);鼓阶打孔组导入耳ABR阈值,术后5天在2kHz、4kHz与术前比较无差异(P>0.05),8kHz较术前增高(P<0.05),16kHz、20kHz较术前明显增高(P<0.01),术后14天在16kHz、20kHz较术后5天时明显好转(P<0.01),但较术前仍有增高(P<0.05)。转导成功率鼓阶打孔组为91.6%,优于完整圆窗膜组的50%。两种转导途径对目的基因在耳蜗内的表达部位和表达时间没有显著影响。结论完整圆窗膜途径及鼓阶打孔途径在转导成功率及听功能保护方面各有优劣。完整圆窗膜途径因其对耳蜗的损伤极小,在临床应用方面具有更好的发展前景。展开更多
A numerical simulation of the toroidal shock wave focusing in a co-axial cylindrical shock tube is inves- tigated by using discontinuous Galerkin （DG） finite element method to solve the axisymmetric Euler equations....A numerical simulation of the toroidal shock wave focusing in a co-axial cylindrical shock tube is inves- tigated by using discontinuous Galerkin （DG） finite element method to solve the axisymmetric Euler equations. For validating the numerical method, the shock-tube problem with exact solution is computed, and the computed results agree well with the exact cases. Then, several cases with higher incident Mach numbers varying from 2.0 to 5.0 are simulated. Simulation results show that complicated flow-field structures of toroidal shock wave diffraction, reflection, and focusing in a co-axial cylindrical shock tube can be obtained at different incident Mach numbers and the numerical solutions appear steep gradients near the focusing point, which illustrates the DG method has higher accuracy and better resolution near the discontinuous point. Moreover, the focusing peak pres- sure with different grid scales is compared.展开更多
基金Supported by the Project of Department of Education of Heilongjiang Province (11555065)~~
文摘The paper has selected major evaluation indexes and established an evaluation system for highway landscape by taking Harbin-Daqing Highway for example,introducing the studied road section,using the latest researches on domestic and foreign highway landscape design and evaluation for reference,and based on relevant materials,field survey and opinions of experts,scholars,drivers,passengers,constructors and managers.Through the evaluation by fuzzy math method based on AHP,it has obtained the fuzzy value of each index of Harbin-Daqing Highway landscape system.Furthermore,by combining with the weights of landscape quality indexes,a judgment matrix has been constructed.Then,based on the weight and single factor judgment matrix,the conclusion vector of the first level of evaluation criteria has been obtained,and the conclusion vector of the second level of evaluation criteria obtained,similarly.In line with maximal subordinate degree,a comprehensive judgment has been conducted on landscape quality of Harbin-Daqing Highway,and it is considered that its landscape quality is general.
基金supported by the National Natural Science Foundation of China(Grant No.50379046)the Doctoral Fund of the Ministry of Education of China(Grant No.A50221)
文摘In order to address the complex uncertainties caused by interfacing between the fuzziness and randomness of the safety problem for embankment engineering projects, and to evaluate the safety of embankment engineering projects more scientifically and reasonably, this study presents the fuzzy logic modeling of the stochastic finite element method （SFEM） based on the harmonious finite element （HFE） technique using a first-order approximation theorem. Fuzzy mathematical models of safety repertories were introduced into the SFEM to analyze the stability of embankments and foundations in order to describe the fuzzy failure procedure for the random safety performance function. The fuzzy models were developed with membership functions with half depressed gamma distribution, half depressed normal distribution, and half depressed echelon distribution. The fuzzy stochastic mathematical algorithm was used to comprehensively study the local failure mechanism of the main embankment section near Jingnan in the Yangtze River in terms of numerical analysis for the probability integration of reliability on the random field affected by three fuzzy factors. The result shows that the middle region of the embankment is the principal zone of concentrated failure due to local fractures. There is also some local shear failure on the embankment crust. This study provides a referential method for solving complex multi-uncertainty problems in engineering safety analysis.
文摘Math Works近日推出Robotics System Toolbox（机器人系统工具箱），这个新产品是Release 2015a的组成部分。、通过即用型算法和用于开发自动移动机器人应用程序的硬件连接性，Robotics System Toolbox提供了常用的机器人算法，以及MATLAB和Simulink与机器人操作系统（ROS）之间的接口和集成。现在，机器人研究人员和工程师们可以在单个统一的设计环境中开发机器人算法，在支持ROS的机器人和机器人仿真器（如Gazebo和V—REP）上测试和部署机器人算法。它通过减少从MATLAB程序转换到ROS程序所需的手动修改时间，留出了更多的时间来测试和调试算法。
文摘MathWorks推出了全新的LTE System Toolbox，为LTE和LTE—Advanced无线通信系统和设备提供了与标准兼容的仿真、验证和分析功能。此工具箱是MATLAB和Communications System Toolbox的扩展，目标用户针对需要设计或验证无线设备是否符合LTE标准的工程师。
文摘 Not long after the establishment of the People's Republic of China in 1949 and the founding of the CAS, when the whole country was still suffering from the wounds of the three-year civil war, a preparatory office for founding the new Institute of Mathematics opened in June 1950. Theoffice was located at No.3 Wenjin Street, in downtown Beiiing.……
文摘The process of turning forest area into land is known as deforestation or forest degradation. Reforestation as a fraction of deforestation is extremely low. For improved qualitative and quantitative classification, we used Sentinel-1 dataset of State of Para, Brazil to precisely and closely monitor deforestation between June 2019 and June 2023. This research aimed to find out suitable model for classification called Satellite Imaging analysis by Transpose deep neural transformation network (SIT-net) using mathematical model based on Band math approach to classify deforestation applying transpose deep neural network. The main advantage of proposed model is easy to handle SAR images. The study concludes that SAR satellite gives high-resolution images to improve deforestation monitoring and proposed model takes less computational time compared to other techniques.
文摘目的研究腺病毒携带Math1-EGFP基因经完整圆窗膜途径及鼓阶打孔途径导入耳蜗后对听功能和转导效率的影响,为内耳基因治疗提供实验基础和理论依据。方法健康成年白色红目豚鼠40只,雌雄不限,体重250～300g。随机分成四组,完整圆窗膜组12只,鼓阶打孔组12只,各组分别设对照8只。实验组(24只)导入重组腺病毒携带的Math1基因及增强型绿色荧光蛋白基因(enhanced green fluorescent protein,EGFP),对照组(16只)导入人工外淋巴液,所有动物均以左耳作为导入耳。术前及术后分别行听性脑干反应(ABR)检查。分别于术后5天、14天取双侧耳蜗标本做基底膜铺片观察基因表达情况。结果完整圆窗膜组导入耳ABR阈值,术后5天各频率与术前比较无显著性差异(P>0.05);鼓阶打孔组导入耳ABR阈值,术后5天在2kHz、4kHz与术前比较无差异(P>0.05),8kHz较术前增高(P<0.05),16kHz、20kHz较术前明显增高(P<0.01),术后14天在16kHz、20kHz较术后5天时明显好转(P<0.01),但较术前仍有增高(P<0.05)。转导成功率鼓阶打孔组为91.6%,优于完整圆窗膜组的50%。两种转导途径对目的基因在耳蜗内的表达部位和表达时间没有显著影响。结论完整圆窗膜途径及鼓阶打孔途径在转导成功率及听功能保护方面各有优劣。完整圆窗膜途径因其对耳蜗的损伤极小,在临床应用方面具有更好的发展前景。
基金Supported by the National Natural Science Foundation of China(50976072,51106099,10902070)the Leading Academic Discipline Project of Shanghai Municipal Education Commission(J50501)the Science Foundation for the Excellent Youth Scholar of Higher Education of Shanghai(slg09003)~~
文摘A numerical simulation of the toroidal shock wave focusing in a co-axial cylindrical shock tube is inves- tigated by using discontinuous Galerkin （DG） finite element method to solve the axisymmetric Euler equations. For validating the numerical method, the shock-tube problem with exact solution is computed, and the computed results agree well with the exact cases. Then, several cases with higher incident Mach numbers varying from 2.0 to 5.0 are simulated. Simulation results show that complicated flow-field structures of toroidal shock wave diffraction, reflection, and focusing in a co-axial cylindrical shock tube can be obtained at different incident Mach numbers and the numerical solutions appear steep gradients near the focusing point, which illustrates the DG method has higher accuracy and better resolution near the discontinuous point. Moreover, the focusing peak pres- sure with different grid scales is compared.
