基于配电数据的关联规则挖掘方法

针对配电数据的时序特性和现有关联规则算法的缺陷,提出了一种考虑配电数据时序变化并通过支持度与置信度进行关联规则挖掘的方法.首先,在数据预处理基础上,构建配电指标网络,依据网络的演化情况挖掘配电数据对应的关联规则,并建立规则–挖掘矩阵存储挖掘的信息;然后,引入Kulc度和不平衡度对关联规则进行过滤,不断更新规则–挖掘矩阵...     

Mineralogy, chemistry and potential applications of a white bentonite in San Juan province, Argentina

A white bentonite deposit of Pleistocene age located in San Juan Province, Argentina, has very promising commercial applications because of its mineralogy and physical and chemical properties. The bentonite occurs in the Lower Member of the Las Trancas Formation which is a hydrothermally altered rhyolitic to rhyodacitic pumice and breccia.Analysis shows the major minerals present are smectite and opal-CT along with minor amounts of quartz, clinoptilolite, feldspar and biotite. The majority of the quartz, clinoptilolite, and biotite occurs in the >325 mesh fraction. The smectite is mainly a sodium montmorillonite along with some calcium and magnesium in the exchange positions. The <2 μm fraction consists of almost pure smectite and opal CT. Scanning electron micrographs show a typical “corn flakes” texture, which is characteristic of sodium montmorillonite.The physical and chemical properties including particle size, surface area, water and oil absorption, swelling index, cation exchange capacity, viscosity, and brightness indicate after wet beneficiation, that the processed white bentonite could be used in many industrial applications. These include paper coating and filling, paint, pharmaceuticals, cosmetics and filtering agents. Also the fine particle size fraction of <2 μm could be used to make an excellent quality organoclay.     

Efficient linear scaling geometry optimization and transition-state search for direct wavefunction optimization schemes in density functional theory using a plane-wave basis

Two linear scaling schemes for the search of stationary points on the nuclear potential energy surface have been developed and implemented for density functional theory programs using plane waves: a geometry optimizer based on the limited-memory Broyden–Fletcher–Goldfarb–Shanno (L-BFGS) method and a linear scaling method for transition-state search based on the microiterative scheme using the partitioned rational function optimizer (P-RFO) and L-BFGS. These optimizers are written with parallelized execution in mind. It is shown that the electronic wavefunction does not need to be fully optimized in the earlier stages of geometry optimization. The reasons for the robustness and good performance of the proposed schemes are identified. Test calculations are presented that use our implementation in the CPMD code.     

刺状氧化锌晶须的特点、应用和制备

刺状氧化锌是一种特殊形貌的晶须，本文介绍了近年来国内外对刺状氧化锌的性质、应用及制备方面的研究成果。     

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