The dynamics differential equations are constructed, and the initial conditions are also given. Simulation shows the following conclusions： The water pressure in cylinder has great instantaneous pulsation and phase s...The dynamics differential equations are constructed, and the initial conditions are also given. Simulation shows the following conclusions： The water pressure in cylinder has great instantaneous pulsation and phase step when outlet valve or inlet valve opens, but is more gently in other time; The volume efficiency is influenced by the output pressure slightly, and decreases as the working rotational speed increases; When the inherent frequency of the valves is integer multiple of the working frequency, the volume efficiency of system will decrease evidently.展开更多
A detecting method based on machine vision was put forward to test the performance of seedmeter with corn and soybean seeds as test samples,in which MATLAB software was applied to process image data and analyze the re...A detecting method based on machine vision was put forward to test the performance of seedmeter with corn and soybean seeds as test samples,in which MATLAB software was applied to process image data and analyze the results.The experimental results showed that the mean value of absolute error of the sowing speed for soybean was 0.004-0.68 seed ？ s-1;the mean value of relative error was from 6.5% to 130%,and there were no significant differences of mean value,standard deviation and coefficient of variation of flowing seeds between manual statistics and MATLAB statistics.The machine vision method was proved to be time-saving,labor-saving and no-touching in the seedmeter precision detecting.展开更多
目的总结巨噬细胞介导的骨免疫在股骨头坏死(osteonecrosis of the femoral head,ONFH)中的作用及其机制研究进展。方法广泛查阅近年国内外有关巨噬细胞介导的骨免疫在ONFH中的作用及其机制的研究,归纳巨噬细胞分类和功能,总结其对ONFH...目的总结巨噬细胞介导的骨免疫在股骨头坏死(osteonecrosis of the femoral head,ONFH)中的作用及其机制研究进展。方法广泛查阅近年国内外有关巨噬细胞介导的骨免疫在ONFH中的作用及其机制的研究,归纳巨噬细胞分类和功能,总结其对ONFH中慢性炎症的骨免疫调控作用,从骨免疫学层面阐述骨坏死病理生理机制,为ONFH治疗提供新思路。结果巨噬细胞是参与炎症反应的重要免疫细胞,可分化为经典活化型(M1型)和选择活化型(M2型),发挥特定功能参与并调节机体的生理病理过程。研究表明,巨噬细胞介导的骨免疫失衡会引起局部慢性炎症并导致ONFH进展。因此,调控巨噬细胞极化是潜在的ONFH治疗策略,包括在慢性炎症免疫微环境中,抑制巨噬细胞向M1型极化可促进局部炎症消退,有效延缓ONFH进展;调控巨噬细胞向M2型极化,构建局部利于骨修复的骨免疫微环境,在一定程度上利于坏死组织再生修复。结论目前研究已明确巨噬细胞介导慢性炎症免疫微环境是ONFH进展的重要机制,后续需要对ONFH中各种免疫细胞的亚型、各种免疫细胞之间以及各种免疫细胞与巨噬细胞之间的相互作用进行研究,有利于开发ONFH潜在治疗手段。展开更多
In this paper, we discuss the concept of local structure-preserving algorithms (SPAs) for partial differential equations, which are the natural generalization of the corresponding global SPAs. Local SPAs for the probl...In this paper, we discuss the concept of local structure-preserving algorithms (SPAs) for partial differential equations, which are the natural generalization of the corresponding global SPAs. Local SPAs for the problems with proper boundary conditions are global SPAs, but the inverse is not necessarily valid. The concept of the local SPAs can explain the difference between different SPAs and provide a basic theory for analyzing and constructing high performance SPAs. Furthermore, it enlarges the applicable scopes of SPAs. We also discuss the application and the construction of local SPAs and derive several new SPAs for the nonlinear Klein-Gordon equation.展开更多
基金This project is supported by National Natural Science Foundation of China(No.10342003).
文摘The dynamics differential equations are constructed, and the initial conditions are also given. Simulation shows the following conclusions： The water pressure in cylinder has great instantaneous pulsation and phase step when outlet valve or inlet valve opens, but is more gently in other time; The volume efficiency is influenced by the output pressure slightly, and decreases as the working rotational speed increases; When the inherent frequency of the valves is integer multiple of the working frequency, the volume efficiency of system will decrease evidently.
基金Supported by Henan Institute of Science and Technology (055031)
文摘A detecting method based on machine vision was put forward to test the performance of seedmeter with corn and soybean seeds as test samples,in which MATLAB software was applied to process image data and analyze the results.The experimental results showed that the mean value of absolute error of the sowing speed for soybean was 0.004-0.68 seed ？ s-1;the mean value of relative error was from 6.5% to 130%,and there were no significant differences of mean value,standard deviation and coefficient of variation of flowing seeds between manual statistics and MATLAB statistics.The machine vision method was proved to be time-saving,labor-saving and no-touching in the seedmeter precision detecting.
文摘目的总结巨噬细胞介导的骨免疫在股骨头坏死(osteonecrosis of the femoral head,ONFH)中的作用及其机制研究进展。方法广泛查阅近年国内外有关巨噬细胞介导的骨免疫在ONFH中的作用及其机制的研究,归纳巨噬细胞分类和功能,总结其对ONFH中慢性炎症的骨免疫调控作用,从骨免疫学层面阐述骨坏死病理生理机制,为ONFH治疗提供新思路。结果巨噬细胞是参与炎症反应的重要免疫细胞,可分化为经典活化型(M1型)和选择活化型(M2型),发挥特定功能参与并调节机体的生理病理过程。研究表明,巨噬细胞介导的骨免疫失衡会引起局部慢性炎症并导致ONFH进展。因此,调控巨噬细胞极化是潜在的ONFH治疗策略,包括在慢性炎症免疫微环境中,抑制巨噬细胞向M1型极化可促进局部炎症消退,有效延缓ONFH进展;调控巨噬细胞向M2型极化,构建局部利于骨修复的骨免疫微环境,在一定程度上利于坏死组织再生修复。结论目前研究已明确巨噬细胞介导慢性炎症免疫微环境是ONFH进展的重要机制,后续需要对ONFH中各种免疫细胞的亚型、各种免疫细胞之间以及各种免疫细胞与巨噬细胞之间的相互作用进行研究,有利于开发ONFH潜在治疗手段。
文摘In this paper, we discuss the concept of local structure-preserving algorithms (SPAs) for partial differential equations, which are the natural generalization of the corresponding global SPAs. Local SPAs for the problems with proper boundary conditions are global SPAs, but the inverse is not necessarily valid. The concept of the local SPAs can explain the difference between different SPAs and provide a basic theory for analyzing and constructing high performance SPAs. Furthermore, it enlarges the applicable scopes of SPAs. We also discuss the application and the construction of local SPAs and derive several new SPAs for the nonlinear Klein-Gordon equation.
