陀螺全站仪常数测定及稳定性分析

本文讨论陀螺全站仪仪器常数测定的方法,并对常数稳定性进行评价。陀螺全站仪是把全站仪和陀螺仪结合为一体的一种物理定向仪器,它不需要依赖其他条件,可以全天候地测定真北方位。在矿山井下工程中应用陀螺全站仪做定向测量的过程中,仪器常数的测定精度和可靠性直接影响到定向结果的精度和可靠性。本文结合矿山实际,测试分析陀螺全站仪仪器常数,并对其精度和可靠性做出评价,针对仪器常数测定方法提出几点意见。     

SEC-MALLS技术中示差常数校正方法的研究

目的：探索激光检测器和示差检测器联用技术中示差常数的测定方法。方法：通过SEC-MALLS技术测定示差检测器的示差常数，再通过标准物质对示差常数进行确认。结果：用该方法校正得到的示差常数带入软件系统，得到了分子量结果与分子量分布准确、可靠。结论：用该方法校正得到的示差常数适用于SEC-MALLS法测定羟乙基淀粉130/0.4的重均分子量和分子量分布。     

露天矿单排水平深孔爆破技术的应用

露天矿单排水平深孔爆破方案适应性强,易于操作,对于新建矿山、边角矿体以及修路困难的采场,单排水平深孔爆破技术具有明显优势。根据实践经验,对不同类型矿山的孔网常数进行了探讨,总结了水平孔爆破施工的一些经验。     

校准线圈常数的交流方法

提出了用交流法校准线圈常数的方法，线路简单、操作方便，能够校准大型和异型线圈，也可以获得较高的精度。当用常数已知的标准线圈进行替代法校准时，可使交流法的精度进一步提高。     

论一阶线性微分方程中的常数变易法

常数变易法是解常微分方程的重要工具。本文以一阶线性非齐式微分方程为例,从常数变易法的定义﹑数学原理和本质上分析,认为常数变易法是解一阶线性非齐式微分方程的简捷方法的形象名称。     

论建立我省比长基线场的技术设计方案

介绍比长基线场在国家经济建筑和科学研究中的作用和意义。重点介绍比长基线场的场地选取和技术设计的基本要求，提出比长基线组合线段的科学设计和检定方法，并对各线段的长度丈量、观测墩定位、标志设置和埋没方法提出了具体要求。     

不同弹性常数下封隔器胶筒性能研究

在油气田分层开采工艺中,封隔器是分隔地层的重要部件,胶筒和套管间的接触应力决定了封隔器工作的可靠性和寿命。通过对超弹性材料的理论分析,建立了胶筒有限元模型,采用非线性有限元方法对胶筒工作状态进行数值模拟,研究了胶筒工作过程中不同弹性常数对胶筒和套管间接触应力分布的影响。结果表明随着弹性常数的增加,胶筒接触压力逐渐增大。     

反向遏止电压法测量普朗克常数

为了将实验的精准度进一步提高,对于实验方法进行了研究,分析,并作出了相应的改动。调查中通过理论分析的方法对光电效应法则中的普朗克常数的数值进行了分析研究。实验时利用反向遏制电压的方法来对数值进行分析,并找出会使结果产生误差的原因。再根据理论分析的结果结合实际的实验操作,对于实验进行改进,将误差减到最小范围,实验的精确度也因此提高了(<0.5%)。     

GNSS基线解算的优化技术

对影响GNSS基线解算质量的主要因素进行分析,结合实例阐明基于南方测绘Gnssadj软件基线解算的优化技术和方法。     

含自旋-轨道耦合效应的BCl分子光谱性质的理论研究

考虑含自旋-轨道耦合效应的多参考组态相互作用方法(MRCI)对BCl分子基态和激发态的光谱结构和性质进行高精度的从头算。得出BCl分子最低解离极限对应12个Λ-S电子态的势能曲线,通过求解一维Sch?rdinger方程能够拟合出束缚态的光谱常数,并与实验值进行对比,证实这些光谱常数的可靠性。考虑自旋-轨道耦合效应之后,12个Λ-S电子态劈裂成23个Ω电子态,拟合得到束缚态的光谱常数。此外文章计算得出基态与低激发态之间的跃迁偶极矩和Franck-Condon因子,并获得了束缚态较低几个振动能级的辐射寿命。     

关于海南南繁产业发展现状存在的问题及发展建议

海南地区具有着得天独厚的自然资源,南繁产业的发展,在我国农业发展中占有重要地位。文章主要从海南南繁产业发展的现状着手,指出现存的几个问题,对其进行分析并提出相应的建议。     

A two–stage approach to additive time series models

For nonlinear additive time series models, an appealing approach used in the literature to estimate the nonparametric additive components is the projection method. In this paper, it is demonstrated that the projection method might not be efficient in an asymptotic sense. To estimate additive components efficiently, a two–stage approach is proposed together with a local linear fitting and a new bandwidth selector based on the nonparametric version of the Akaike information criterion. It is shown that the two–stage method not only achieves efficiency but also makes bandwidth selection relatively easier. Also, the asymptotic normality of the resulting estimator is established. A small simulation study is carried out to illustrate the proposed methodology and the two–stage approach is applied to a real example from econometrics.     

Models for status inconsistency and mobility: A comparison of the approaches by Hope and Sobel with the mainstream square additive model

This paper is about the analysis of effects of status inconsistency and mobility on a dependent variable. We compare the mainstream square additive baseline model to alternative designs by Hope (1971, 1975) and Sobel (1981, 1985). Both writers claim that the square additive baseline model also contains some status inconsistency effects. An examination of the relationships between the square additive model, Hope's halfway/difference model, and Sobel's simple diagonal reference model shows that the effects uncovered by Sobel and Hope pertain to the inequality of the effects of the status variables on the dependent variable. These salience difference effects are therefore distinct from the non-additive status inconsistency effects which would be detected using the square additive approach. Less restricted versions of the diagonal reference model, the DM-1 and DM-2 models as well as a recent model by Weakliem (1992), are also examined with regard to additive/non-additive components and symmetry of effects.     

丙烯醛生产工艺技术进展

丙烯醛又称烯丙醛,是一种用途广泛的重要有机化工原料。目前主要用于动物饲料添加剂蛋氨酸的制备。合成丙烯醛的方法较多,有些因原料不具有广泛易得经济性较差,原料廉价易得的合成方法因没有性能较好的催化剂致使其选择性、收率不高等原因而未工业化。目前丙烯空气氧化法生产丙烯醛是主要方法。     

Winters乘法模型在管线探测企业库存控制中的应用--以A机械仪器有限公司为例

文中以一家地下管线探测企业为例，对其在库存管理中面临的问题进行分析，探究成因并提出解决方案：以库存成本降低为目标，加强需求预测设置合理的库存水平。为此，文中将采购物品按ABC分类法进行分类，建立了Holt-winters乘法模型，利用SPSS软件对该公司A类物品近两年的销售数据进行分析，进而对其库存金额进行预测。     

Implicitly additive utility and the nature of optimal economic growth

The solution of an optimization problem frequently depends only on the constraint set and on the indifference set through the optimum. This observation is spelled out and applied to the problem of optimal economic growth. The validity of the turnpike property of optimal growth plans is investigated when the intertemporal utility function is not additive, but has the property that each of its indifference sets is also an indifference set for some other utility function which is additive and has a constant rate of discount. A characterization is provided for such utility functions, which are called implicitly additive.     

世博会与上海旅游产业簇群化发展研究

本文分析了上海旅游簇群的必要性和可行性,世博会对上海旅游产业簇群的形成、繁衍扩散和网络化发展的推动作用,以及上海旅游产业簇群在世博会举办前、中、后应采取的不同发展模式。世博会和簇群相结合,能实现上海旅游产业有效接受"世博效应"的辐射和自身"簇群效应"的放大,提升上海旅游产业的国际竞争力和促进上海经济的繁荣。     

Optimal variable weighting for ultrametric and additive tree clustering

A method is developed which for a given objects by variables data matrix estimates weighted inter-object distances that are optimally suited for either an ultrametric or an additive tree representation. The effectiveness of the method is demonstrated on two synthetic data sets having a known tree structure and on one real data set. In the final section, some possible extensions of the present method are discussed.     

黑果腺肋花楸的组培快繁技术研究

对黑果腺肋花楸的组培快繁技术进行了研究。结果表明:茎段茎尖在MS+BA2+NAA0.2培养基上可诱导出愈伤组织,在MS+BA0.1+NAA0.015培养基上继代一次即可出苗,繁苗系数8倍以上;生根培养以1/2MS+NAA0.04培养基为最好,生根率达100%,并且每株可达5～10条根;移栽基质以纯沙为最好,成活率达98%以上。     

Exponential smoothing with a damped multiplicative trend

Multiplicative trend exponential smoothing has received very little attention in the literature. It involves modelling the local slope by smoothing successive ratios of the local level, and this leads to a forecast function that is the product of level and growth rate. By contrast, the popular Holt method uses an additive trend formulation. It has been argued that more real series have multiplicative trends than additive. However, even if this is true, it seems likely that the more conservative forecast function of the Holt method will be more robust when applied in an automated way to a large batch of series with different types of trend. In view of the improvements in accuracy seen in dampening the Holt method, in this paper we investigate a new damped multiplicative trend approach. An empirical study, using the monthly time series from the M3-Competition, gave encouraging results for the new approach at a range of forecast horizons, when compared to the established exponential smoothing methods.