基于DIMINE的红龙厂铜矿床地质建模与储量计算

根据云南元江红龙厂铜矿区地质勘查资料,结合DIMINE软件建立了矿床地质数据库,构建了矿区断层及矿体的三维实体模型,不仅实现了钻孔数据信息的三维可视化,而且直观、真实地揭示了矿体的产出位置及空间形态特征。基于地质统计学原理,筛选出钻孔样品数据并对其进行组合,根据组合后样品的统计分布特征,建立了矿区变异函数模型,利用普通克里格法对矿床内铜品位块体进行赋值,结合赋值结果,采用块段模型法对矿床储量进行估算。结果表明,红龙厂铜矿建模精度较高,储量计算结果较为可靠,可为矿山资源动态管理及后续生产工作提供重要的理论依据。     

Generalized stress field in granular soils heap with Rayleigh–Ritz method

The stress field in granular soils heap (including piled coal) will have a non-negligible impact on the settlement of the underlying soils. It is usually obtained by measurements and numerical simulations. Because the former method is not reliable as pressure cells instrumented on the interface between piled coal and the underlying soft soil do not work well, results from numerical methods alone are necessary to be doubly checked with one more method before they are extended to more complex cases. The generalized stress field in granular soils heap is analyzed with Rayleigh–Ritz method. The problem is divided into two cases: case A without horizontal constraint on the base and case B with horizontal constraint on the base. In both cases, the displacement functions u(x, y) and v(x, y) are assumed to be cubic polynomials with 12 undetermined parameters, which will satisfy the Cauchy's partial differential equations, generalized Hooke's law and boundary equations. A function is built with the Rayleigh–Ritz method according to the principle of minimum potential energy, and the problem is converted into solving two undetermined parameters through the variation of the function, while the other parameters are expressed in terms of these two parameters. By comparison of results from the Rayleigh–Ritz method and numerical simulations, it is demonstrated that the Rayleigh–Ritz method is feasible to study the generalized stress field in granular soils heap. Solutions from numerical methods are verified before being extended to more complicated cases.     

Series Estimation of a Probability Density Function

A class of nonparametric estimators of f(x) based on a set of n observations has been proved by Parzen [l] to be consistent and asymptotically normal subject to certain conditions. Although quite useful for a wide variety of practical problems, these estimators have two serious disadvantages when n is large: 1. All n observations must be stored in rapid-access storage.

2. Evaluation of f(x) for a particular value of x requires a long computation involving each of the observations.

The Parzen estimator, which has n terms, can be replaced by a series approximation which has a number of terms determined by the accuracy required in the estimate rather than by the number of observations in the sample. The summation over all of the observations is performed only to establish the value of the coefficients in the series.

Although no member of the class of estimators has been proved “best” for estimating an unknown density from a finite sample, a power series expansion for a particular member of the class was singled out because of computational simplicity. A comparison is made between the proposed estimator and the Gram–Charlier Series of Type A. A multidimensional counterpart of the proposed estimator has also been derived.     

3D geometric constraint solving using the method of kinematic analysis

In this paper, an approach based on kinematic method for solving 3D geometric assembly constraints is presented. The relative generalized coordinates and generalized recursive formulations used in kinematic analysis are utilized to reduce the size of constraint equations. Based on the cut-constraint method, this approach can be used to solve all kinds of configurations. In the case of an open-loop constraint system, the geometric constraints can be satisfied by sequentially determining the values of relative generalized coordinates. With respect to a closed-loop constraint system, the proposed approach converts it to a spanning tree structure by cutting constraints and introducing cut-constraint equations. Furthermore, a topological analysis method is also developed to obtain the spanning tree with the minimal number of cut-constraint equations, and the analytical Jacobian matrix of cut-constraint equations is derived to enhance computational efficiency. In the end, the proposed approach is demonstrated and validated using two examples of closed-loop geometric constraint system.     

轮状病毒LLR疫苗株VP7基因的遗传变异研究

目的研究轮状病毒(RV)LLR疫苗株VP7基因的遗传特征,为疫苗的质量控制和发展提供依据。方法将LLR株轮状病毒毒种LLR38在原代牛肾细胞上连续传至49代。提取第38、43、44、49代病毒RNA。通过RT-PCR扩增VP7基因片段,将其克隆入质粒pGEM-T中,进行序列测定与分析。结果LLR株VP7基因全长1062bp,含编码326个氨基酸的单一的开放读码框架(ORF)。各代次病毒的VP7基因核苷酸与推导的氨基酸变化完全一致,与GenBanK中LLR参考株(L11602)同源性分别为99.9%和99.7%。与14株G10血清型RV毒株之间,核苷酸与推导的氨基酸序列同源性分别为84.3%～87.4%和92.7%～94.9%;与不同血清型RV代表株间,VP7基因核苷酸与推导的氨基酸同源性分别为62.2%～76.8%和72.9%～83.1%;在A、B、C3个重要抗原表位,LLR株与同一血清型RV代表株B223氨基酸同源性高达97.5%,而与不同血清型仅为42.5%～62.5%。结论轮状病毒LLR疫苗株VP7基因具有良好的遗传稳定性,与来自不同国家同一型别的RV株VP7蛋白氨基酸序列之间无明显差异,在遗传上密切相关,从VP7基因分子水平证明LLR株毒种及其制备的疫苗是安全可靠的。     

大庆油田北二西弱碱三元复合驱试验动态变化特征

本文系统地分析了北二西弱碱三元复合驱试验区生产过程中的动态变化特征,指出影响弱碱三元复合驱开发效果的主要因素。针对问题,开展了综合调整的研究工作,总结出改善试验效果的有效途径,通过改善三元体系配方,提高聚驱控制程度,完善井组注采关系,减少平面及层间差异,适时进行动态方案的调整,改善油井受效状况等技术措施,试验取得了较好的开发效果。     

卷烟焦油测试嵌套析因设计分析

为了研究卷烟焦油测试过程中的各变异源的差异,采用完全嵌套方差分析和嵌套析因设计分析对各变期源进行分析.结果表明:①具有明确原因的变异源中,总粒相物的变异性最大,为42.0％;总粒相物和滤片含水量(W&W)的变异性较大,为30.6％;空白水分变异性为25.3％;烟碱和气相色谱仪引入的变异性仅占2.3％;在进行减小测量变异性改进时应从前3个变异源考虑;②由日期和时间引起的变异性为42.9％,在卷烟焦油比对测试时应参考日期和时间方向上的变异进行设计.     

Determination of potential inherent variability when measuring beef quality

Probes, which can be used on-line to rapidly and efficiently detect beef quality attributes (colour and tenderness), are currently being considered to predict ultimate beef quality. The contribution of the inherent sampling variability (due to factors such as muscle location) needs to be evaluated in order to optimise the sampling procedure for these measurements. The main objective of this trial was to monitor some sampling factors which may contribute to variation in pH and various quality attributes in bovine M. longissimus thoracis et lumborum (LTL). Location along the muscle did not impact on colour measurements (P0.05). Location had no effect on cook loss, Warner Bratzler shear force (WBSF) and sarcomere length values (P0.05). The moisture and intramuscular fat contents did vary (P0.05); however, as the differences were very small this may not be of practical significance. Different models of pH meters/probes had a significant influence (P0.01) on recorded pH values. However pH did not differ significantly (P0.05) along the length of the LTL. The type of meter used also had a significant impact on colour readings and 1 h ‘blooming’ time was observed as optimal for measuring colour on beef.     

浅议成人高等教育生源结构的变化对成人高校招生的影响

我国高等教育规模的迅速扩大,使成人高等教育招生面临着诸多挑战。本文在客观分析了成人高等教育生源结构的变化和趋势的基础上,提出了成人高等院校从招生层面应对生源结构变化的对策,即不断扩大本科招生比例,面向行业企业进行招生,对函授站点及招生专业进行合理布局。     

表流型湿地原生动物的季节变化与水质的关系

以2009年冬季和2010年春季采样监测数据为依据,分析表流型（SWF）人工湿地系统中原生动物的种类与校园生活污水处理效果的关系。通过对原生动物种类的变化和对应的COD、氨氮、TP的相互关系的研究证明：（1）当COD值由进水时的120mg/L左右逐渐降低至55mg/L,氨氮由12.4mg/L降至7.9mg/L,TP值由...