小麦中提取尿囊素工艺的研究

采用超声波法从小麦中提取尿囊素,通过正交实验研究了最佳提取条件为:提取试剂60%的乙醇,料液比1∶15,超声温度40℃,超声时间20 min,提取次数为2次.采用高效液相色谱法对小麦中尿囊素含量进行测定.     

对如何改进解析几何学科教学效果的几点思考

根据解析几何的学科特点,在教学上通过改进教学方法,理论联系实际,引入数学软件等方式来提高教学效果,培养学生从几何直观的角度分析问题和解决问题。作为高校教师要注重自身的学习提高。以适应现代教学及学科改革的实际要求。     

关于Bernoulli不等式的推广

本文在经典的Bernoulli不等式的基础上对Bernoulli不等式的一般情形进行了进一步的研究，给出了其几何解释和证明，并得到了Bernoulli不等式的一个推广。     

Science Letters: Vascular architecture: is it a helpful histopathological biomarker for hepatocellular carcinoma?

Hepatocellular carcinoma (HCC) remains one of the major public health problems throughout the world. Although originally associated with tumorigenic processes, liver angiogenesis has also been observed in the context of different liver inflammatory, fibrotic, and ischemic conditions. Here we investigate the fractal dimension as a quantitator of non-Euclidean two-dimensional vascular geometry in a series of paired specimens of primary HCC and surrounding non-tumoral tissue, and discuss why this parameter might provide additional information regarding cancer behavior. The application of fractal geometry to the measurement of liver vascularity and the availability of a computer-aided quantitative method can eliminate errors in visual interpretation, and make it possible to obtain closer-to-reality numerals that are compulsory for any measurement process.     

在韦尔公理体系下重建中学几何系统

叙述了向量空间中的韦尔公理体系的一种方案,并在此方案下重建中学几何系统.     

稠油油田蒸汽吞吐热采参数的正交设计

蒸汽吞吐热采是稠油热力开采的主要方式.由于稠油油田地质情况的差异,注汽参数必然不可能一样,本文根据某稠油油田提供的有关资料,对其注汽参数进行正交设计,并通过方差分析,获得最佳施工方案.     

Sensitivity analyses of cables to suspen-dome structural system

The construction of the cables is a key step for erecting suspen-dome structures. In practical engineering, it is difficult to ensure that the designed pre-stresses of cables have been exactly introduced into the structures in the site; so it is necessary to evaluate the influence of the variation of the pre-stresses on the structural behavior. In the present work, an orthogonal design method was employed to investigate the pre-stressed cables' sensitivity to the suspen-dome system. The investigation was concentrated on a Kiewitt suspen-dome. Parametric studies were carried out to study the sensitivity of the structure's static behavior, dynamic behavior, and buckling loads when the pre-stresses in the cables varied. The investigation indicated that suspen-dome structures are sensitive to the pre-stresses in all cables; and that the sensitivity depended on the location of the cables and the kind of structural behavior. Useful suggestions are given at the end of the paper.     

价电子对互斥理论与分子构型

本文阐述了价电子对互斥理论的基本要点和判断分子空间构型的规则；计算出价层电子对数；得到电子对的几何排布，从而判断出分子的几何构型。     

基于Maple的高等代数与解析几何可视化教学探索

文章结合高等代数与解析几何课程的自身特点,探讨了如何把具有强大符号运算和可视化功能的Maple软件应用于本课程的教学过程中。可以看出:无论是理论推导方面,还是问题求解及其运算过程的演示方面,Maple都能有效地应用于该课程的教学中。     

Optimization design of the stratospheric airship’s power system based on the methodology of orthogonal experiment

The optimization design of the power system is essential for stratospheric airships with paradoxical requirements of high reliability and low weight. The methodology of orthogonal experiment is presented to deal with the problem of the optimization design of the airship’s power system. Mathematical models of the solar array, regenerative fuel cell, and power management subsystem (PMS) are presented. The basic theory of the method of orthogonal experiment is discussed, and the selection of factors and levels of the experiment and the choice of the evaluation function are also revealed. The proposed methodology is validated in the optimization design of the power system of the ZhiYuan-2 stratospheric airship. Results show that the optimal configuration is easily obtained through this methodology. Furthermore, the optimal configuration and three sub-optimal configurations are in the Pareto frontier of the design space. Sensitivity analyses for the weight and reliability of the airship’s power system are presented.