知识发现中概率统计与粗集方法的比较

对知识发现中,概率统计方法与粗集理论方法在评价系统参数的重要性,分类隶属度与条件概率,输入条件与决策结果的依赖关系等方面进行了比较, 提出了将概率统计方法和粗集理论相结合,由确定性粗集的近似空间扩展到了不确定性的概率粗集的近似空间,为确定性和不确定性知识表达系统提供一个统计粗集模型。     

均相法制备文石型碳酸钙晶须

在不加入任何结晶控制剂的条件下,采用CaCl2和Na2CO3的稀溶液并加的均相反应法制得了具有较好光滑性和长径比、分布均一的文石型碳酸钙晶须。其最佳工艺条件为:CaCl2与Na2CO3溶液浓度为0.025mol/L,滴加速度为1.20ml/min,滴管直径为3mm,搅拌速度为500r/min。     

冲击荷载下地基下沉量预测

冲击荷载加固地基，场地地基下沉量的计算可用于估计其它地基加固效果指标。本文采用三种方法对地基下沉量进行计算，工程实例表明极限孔隙比法预测结果最好。     

护理程序在CCU监护室的应用及体会

目的：对116例CCU监护室病人运用护理程序实施整体护理进行总结。方法：运用护理程序针对病人存在的问题，列出护理诊断，确定护理目标，制定护理措施及评价措施实施效果。结果：提高了病人的抢救成功率，降低了并发症，提高了病人的满意率。结论：将护理程序贯穿于CCU监护室的整体护理全过程，能够使对心脏病人的护理更具有科学性、预见性和条理性，从而提高护理质量。     

近年来马克思社会形态理论研究述评

马克思的社会形态理论是近年来学术界研究的一个热点问题。本文拟就学术界关于这一理论研究中争论的焦点问题即社会形态的含义、“五形态”与“三形态”之争、“三形态”划分的差别、“两阶段”论、社会形态的“跨越”的主要观点进行综述,并且作一些评论。     

Composition operators between p-Bloch space and q-Bloch space in the unit ball

Let B_n be the unit ball of C~n and φ= (φ_1,…,φ_n) a holomorphic self-map of B_n. The main purpose of this paper is todiscuss the boundedness and compactness of composition operator C_φ between p-Bloch space β~p(B_n) and q-Bloch space β~p(B_n), where p≥0 and q≥0.     

Schrdinger方程的高精度隐式差分格式

通过待定系数法构造了Schr鰀inger方程的高精度隐式格式,同时对其稳定性进行了理论分析,并用数值例子说明所作分析的正确性.     

Dynamical framework with blocking topography coordinates for atmospheric GCM and its validation

The dynamical framework with Blocking Topography Coordinates (hereafter, BTC), which is suited to handle the steep topography for the atmospheric general circulation models, is presented in this paper, together with its validation results. The integral properties of both the differential and finite-difference equations for the BTC dynamical core are: gross mass conservation, quadratic conservation for advection terms, Coriolis force does not change the kinetic energy, conservation of total available energy. The improved nonlinear iteration scheme is utilized for the time-integration. The energy conservation for BTC dynamical core is validated by using the integration results from 9-layer and 21-layer version respectively. Comparison results show that, the changes of the kinetic energy and total available potential energy during the integration are quite close for both the BTC dynamical framework and the dynamical framework of IAP 9-level and IAP 21-level AGCM, and this may suggest that the BTC dynamical core can be used for long-term integration with good computational stability. Furthermore, the BTC dynamical core has the advantage over the terrain following (sigma) coordinates in its better representation of the influence of the large-scale topography on the atmospheric general circulation. Finally, the correctness and reasonableness of the BTC dynamical core has been further proved by the numerical simulation of the topography influence on the quasi-stationary planetary wave with 21-layer version of BTC dynamical framework.     

计算网格的抽象定义

计算网格是第三代因特网和高性能并行计算的研究热点,它提供了一个有效的平台,共享资源,支持全球范围内分布异构应用程序的运行,其动机和目标是明显的,并被人们广泛认同和接受。但是目前网格系统尚无一个清楚的定义,因此基于网格语义,通过高层抽象,用谓词/变迁系统给出计算网格的框架模型。     

开关稳压电源性能的改进

详细分析了开关稳压电源的工作过程，并针对功率晶体管的二次击穿，提出了RC吸收网络，并通过优化基极驱动减少晶体管的开关损耗，从而提高开关稳压电源的性能。