线性代数教材建设的探索与实践

线性代数是高校理工农医类及经管类各专业的重要基础课程之一,为了适应地方一般院校的教学需要,对线性代数教材建设做了一些探索与实践。     

Acoustic impedance characteristics of linear compressors

The acoustic field of a linear compressor serves to deliver the compression work to the load, such as the connected cold head of a cryocooler; it plays an equivalently important role as the electrical and mechanical parts, especially in the impedance match issue. This paper studies the acoustic impedance characteristics of a linear compressor. The parameters including the current, the piston displacement, the pressure amplitude, the electrical power dissipation, the power factor, the pressure-volumetric (PV) power delivered, and the efficiency are theoretically and experimentally investigated. Different from previous theoretical studies, optimization for the operations away from the resonance is also included. More general optimization results imply relevance between thermoacoustic engines and linear compressors. The predicted results are validated by the experiments performed on a linear compressor with an adjustable resistive-capacitive (RC) acoustic load. The comparisons between the calculations and the measurements are presented and analyzed. The results provide deeper insight into the mechanism of the linear compressor and the impedance match in a cryocooler system.     

由线性递推公式求数列的通项

由线性递推公式求数列的通项,在高中数学考试,大学数学考试经常出现。特别是计算机软件设计中应用更是广泛。本文就高考数学中出现的线性递推公式求数列的通项的问题,通过初等数学和高等数学来解决。体会它们的相同和差异特点。     

碳钢在Na2 CO3液层中腐蚀的线性扫描伏安法的研究

用线性扫描伏安法研究了碳钢在Na2CO3液层中腐蚀的电化学行为,讨论了碳钢在-0．1～0．8V电位范围内活化和钝化过程。     

黑龙江省玉米品种布局的农业气候依据

根据玉米分期播种资料,得出不同品种播种到出苗,出苗到抽雄及抽雄到成熟的热量指标,以地区热量资源的满足程度确定其成熟度及成熟概率。根据不同品种的成熟概率及收益状况,利用概率决策方法确定地区的主栽品种以及利用线性规划的方法求解不同品种最佳搭配的比例,从而为充热量指标;概率决策;线性规划     

谈压缩映象原理及其应用

文章介绍了压缩映象原理及其在解决线性方程组、隐函数存在性、常微分方程和Volterra积分方程解的存在唯一性等四个方面的重要应用.     

An efficient method for parallel CRC automatic generation

The State Transition Equation (STE) based method to automatically generate the parallel CRC circuits for any generator polynomial or required amount of parallelism is presented. The parallel CRC circuit so generated is partially optimized before being fed to synthesis tools and works properly in our LAN transceiver. Compared with the cascading method, the proposed method gives better timing results and significantly reduces the synthesis time, in particular. Project (No. 60271010) supported by the National Natural Science Foundation of China     

对一种线性规划新算法及其改进算法的修正与改进

通过对一种线性规划新算法具体执行过程中的一些关键环节进行分析,证明了边界面上可行方向的充分必要条件,指出了这种算法及其改进算法执行过程中可能遇到的问题,并在此基础上结合核心算法线性规划问题解的特点对算法过程进行了改进修正,使得改进后的算法更合理,更完善.     

线性代数概念教学初探

概念是反映一类对象本质属性的思维形式,是导出命题和法则的逻辑基础。学好概念是学好线性代数的基础。本文就线性代数概念的教学提出一些见解。