一类具有反馈控制捕食系统的持久性

利用微分方程比较原理研究了一类具有反馈控制的捕食系统，得到了保证该系统持续生存的充分条件．     

HPFL加固混凝土结构斜截面承载力计算及工程应用

根据企业集群与生物种群有着一定的相似性，借鉴种群生态学中的种群竞争模型建立了网状型企业集群模式下企业间竞争关系的数学模型 —— 一类具脉冲效应和反馈控制的非自治企业竞争模型系统，并通过脉冲微分方程的比较性定理，建立了该系统持久性生存的充分条件，并做经济学解释.     

大学英语写作教学中整合反馈模式的实验研究

本研究通过实验探讨了融合教师批语式反馈、会谈式反馈、同级反馈为一体的整合反馈模式在大学英语写作教学中的有效性。期待能为教师将单一写作反馈方式朝多角度多次写作反馈模式转变的教学改革提供实验支持和建议。     

动物科学专业本科毕业生就业与社会评价反馈的调查与分析

通过对2009～2012届动物科学专业本科毕业生就业及就业单位的调查,掌握了目前该专业毕业生的就业岗位、收入、工作性质及行业内任职等情况;用人单位对毕业生的满意度、业务评价等社会评价信息,并对该专业学生的培养方式提出了改进意见。     

一类非自治混沌系统的时滞反馈控制

针对一类非自治混沌系统,提出一种时滞反馈控制方法,通过构造特殊的Lyapunov函数,利用时滞微分方程稳定性理论,分析和证明了受控系统的全局指数稳定性.最后将理论结果应用到典型的洛仑兹(Lorenz)系统和约瑟夫森(Josephson)系统,并给出数值模拟来验证结论的正确性.     

带有反馈环节的装配系统的混沌特性研究

应用混沌学理论研究了带有正反馈环节的装配系统的特性,以缓冲区工件工件数量为状态变量,反馈作为控制变量,建立了装配系统的加工缓冲区的差分方程模型．通过Matlab仿真,绘制其分岔图及其Lyapunov指数谱,研究了装配系统的性能．结果表明,在正反馈环节的影响下,当反馈回来的次品数量占到它的加工工件的一定比例时,装配系统表现出混沌的特性,从而证明了装配系统的简单动力学方程蕴含着混沌．     

Effect of Extending the Growing Period on Yield Formation of Sugar Beet

Autumn sown sugar beets (winter beets) are expected to yield markedly higher than spring sown beets. This requires a continuous growth during an extended growing period. So far, bolting‐resistant sugar beet varieties are not available to test winter beets under field conditions in Central Europe. The objective of this study was therefore to analyse yield formation and sugar storage of sugar beet plants during an extended growing period to estimate whether sugar beet has the potential to generate the theoretically expected yield increase. From 2008 to 2012, pot experiments were carried out in the glasshouse with 11 sowing dates spread over the years with sequential harvests. The oldest plants were grown for 859 days (14 242 °Cd). Root fresh matter yield continuously increased till the latest harvest. In contrast, the sugar concentration reached an optimum value between 3400 and 5000 °Cd and then decreased with time. Despite longer growing periods, the number of cambium rings, which are regarded as essential for sugar storage, did not change. This points to an early and genetically fixed determination of the formation of cambium rings. Additionally, the rate of photosynthesis decreased concomitantly with the sugar concentration. In conclusion, there is some evidence that the sugar concentration of the storage root is limited by the sink capacity, which in turn controls the source activity by a feedback regulation of photosynthesis and leaf formation. The dry matter composition of the storage root changed towards lower sugar concentration and concurrent higher concentration of cell wall compounds (marc). The sugar yield still increased beyond a thermal time at which winter beets will probably be harvested in practice. Hence, the theoretical yield increase in autumn sown sugar beets can be realized, provided that the plants show sufficient winter hardiness and bolting resistance.     

一种线性定常多变量系统的工业调节器设计

导出了当干扰为恒定不可测和恒定可测两种情况下为系统稳定和输出可调的充要条件及其控制规律，在此基础上，提出一种适用于线性定常多变量系统的实用工业调节器的设计方法。     

能量直接回馈进行同步发电机温升试验的研究

给出同步发电机与同型号同步电动机同轴组成的温升试验系统。电动机是发电机发电气负载，将电能转变为机械能；电动机又是发电机的原动机，直接把机械能回馈给发电机。该系统由较小容量直流电动机驱动，给系统损耗的电能进行补给。这种温升试验方法是经济实用的新方法。     

Existence of a State Feedback of not Changing the Observability of the System

By modern cybernetics, we can find out a state feedback for a linear time system, which does not change the controllability and stability of the system. But whether a state feedback for linear time system can be found out, which does ont change observability of the system or not, so far hasn't been discussed. The problem is studied according to the steady discrete time linear system, and a state feedback is found out, which does ont change the controllability, observability and stability, by relation of stability, observability and characteristic root, rank of matrix, of steady discrete time linear system; the method of how to construct the state feedback is given.