在概率统计教学中融入数学建模思想探析

文章探讨了在概率统计教学中数学建模思想的形成和建立的途径,指出在概率统计教学中融入数学建模的思路对提高学生学习概率统计的积极性和主动性的作用。     

银的抗菌作用机理

介绍银的抗菌机理的4种理论：静电吸附杀菌、金属溶出杀菌、光催化杀菌和复合作用杀菌。分析银的抗菌机理与抗菌材料载体种类、细菌结构与成分及银的价态的关系。要得到既长效又广谱、既高效又安全的银系抗菌材料，有必要对银的抗菌机理进行更深入的研究。     

用非交换图刻画L3(q)

令G是一个有限群,其非交换图▽（G）如下定义：顶点集合▽（G）是G／Z（G）,当两条边x与y的换位子不等于单位元时x与y相连.我们证明了如果G是一个有限群,且▽（G）≌▽（M）,其中M=L3（q）,q=pn,p是素数n∈N,则G≌M.     

DINSAR measurement of glacier motion in Antarctic Grove Mountain

Grove Mountain is an important nunatak region on East Antarctic Glacier that blocks the ice flow to- ward Lambert Glacier. The existence of nunataks and subglacial mountains leads to complex ice flow patterns, which are difficult to be measured by conventional ground-based methods. In this study, several JERS-1 and ERS-1/2 SAR images covering this area are used for 3-pass and 4-pass differential interferometric processing. The ice flow field of Grove Mountain and the eastern zone are derived and validated with related knowledge. The research shows that DINSAR is an effective method for meas- uring complex ice flow in Antarctic inland glacier. L-band DINSAR is more suitable for mid or fast ice flow than C-band over this region.     

The growth dynamics of tumor subject to both immune surveillance and external therapy intervention

Considering the growth of tumor cells modeled by an enzyme dynamic process under an immune surveillance, we studied in anti-tumor immunotherapy the single-variable growth dynamics of tumor cells subject to a multiplicative noise and an external therapy intervention simultaneously. The law of tumor growth of the above anti-tumor immunotherapy model was revealed through numerical simula- tions to the relevant stochastic dynamic differential equation. Two simulative parameters of therapy, i.e., therapy intensity and therapy duty-cycle, were introduced to characterize a treatment process similar to a tumor clinic therapy. There exists a critical therapy boundary which, in an expo- nent-decaying form, divides the parameter region of therapy into an invalid and a valid treatment zone, respectively. A greater critical therapy duty-cycle is necessary to achieve a valid treatment for a lower therapy intensity while the critical therapy intensity decreases accordingly with an enhancing immunity. A primary clinic observation of the patients with the typical non-hodgekin’s lymphoma was carried out, and there appears a basic agreement between clinic observations and dynamic simulations.     

尺蠖型压电旋转驱动器钳位特性分析

采用MSC.Marc有限元软件的接触分析模块,对钳位过程中钳位块与转子的微观接触过程进行了研究,通过对钳位机构与转子间接触力学问题的分析,以及对转子接触摩擦状况的实验测试,提出了采用大钳位接触面的钳位机构方案.实验表明,采用大钳位接触面的尺蠖型压电驱动器在保证驱动器运动分辨率、运动稳定性的基础上,其承载能力比小钳位接触面的同类驱动器提高了2倍,大接触面钳位机构不仅有利于降低驱动器的局部磨损,而且还提高了驱动器的使用寿命.     

乌鲁木齐城市圈循环经济型生态城市模式研究

文章首先在分析循环经济与生态城市内涵的基础上阐明了循环经济与生态城市的关系,再从五个方面阐述了乌鲁木齐城市圈构建循环经济型生态城市的必要性,最后结合实际重点论述了乌鲁木齐城市圈构建循环经济型生态城市的模式.     

基于XML的异构数据源间数据交换的实现研究

基于Web Service、XML等设计开发了可配置的灵动数据集成中间件,用于不同数据库系统之间的数据迁移,很好地解决了异构系统之间的数据集成问题,该中间件具有的可扩展性和随需应变的能力,可以适应企事业单位不断发展的信息化需要.详细介绍了数据集成中间件的结构和实现功能,并在基于关系型数据库的档案和办公系统的数据集成中应用了该方案,为用户提供可配置的使用方式.     

河流崩岸防治的模袋排帘法及模型试验

为解决冲刷引起的崩岸问题,结合土力学和水力学两方面的原理,提出了崩岸防治新措施——模袋排帘。通过室内水槽模型的含沙水流试验,测量泥沙冲淤地形变化,对所提出的模袋排帘的功效进行了直观的验证。结果表明,模袋排帘结构形式能有效调整近岸坡水流结构;透沙窗的设置,适应河流悬沙分布特征,实现了局部淤积、稳定岸坡地形的目的;大大降低岸坡上的排体覆盖率,经济成本得到削减,且施工方便。     

Relationship between plant species diversity and patch characteristics in a marsh in the Sangjiang Plain, China —Using Yaluhe farm as an example

Based on Quick Bird satellite image data, the present study examined small-scale herbaceous community patches in the marsh of the Sanjiang Plain and measured patch characteristics such as the area, perimeter and shape by GPS. The coenological characteristics of the patches were investigated using quadrat method, and the vascular plant species were recorded using transect method. A total of 219 plant species were recorded, which represents 12.2% of the vascular flora in Heilongjiang Province. Our results showed that species number S correlated with patch area and perimeter; richness index (R) correlated with patch perimeter; Simpson index (D) correlated with patch area and perimeter/area; Shannon-Wiener index (H′) correlated with patch area, perimeter and perimeter/area; Evenness index (Jsw) correlated with perimeter/area. Both S and R have significant difference between different size of patches. Plant diversity in the small-scale herbaceous communities tended to increase with the patch area and perimeter. We concluded that edge effects and the habitat heterogeneity of the patches are important in determining the number of species. The relative smoothness of the patch edges also affects the plant diversity of the patches. The richness of plant species in the marsh in the Sanjiang Plain is highly sensitive to the small-scale patches, which continues to play an important role in preserving plant diversity in the local area.