深海半潜式钻井平台重量体积分数的研究

深海半潜式钻井平台的空船重量对平台可变载荷、结构强度、水动力性能等具有一定影响,空船重量过大会导致平台超重、可变载荷减小等不良影响。为研究和控制海洋平台的空船重量对海洋平台的影响,提高可变载荷,以第六代半潜式钻井平台为研究对象,对半潜平台的空船重量、体积进行统计分析与研究,并提出重量体积分数这一概念。深海半潜式钻井平台的重量体积分数就是平台的空船重量与体积的比值。通过对所统计的重量、体积的数值进行分析研究,最终得出最佳重量体积分数,为以后平台的设计、建造,特别是新船型的设计、制造提供了一定的依据。

多晶材料X射线衍射定量分析的多项式拟合法

提出了多晶材料X射线衍 (XRD)射定量分析的多项式拟合法 ,该方法将数学函数模型与计算机技术相结合 ,在建立衍射峰数学函数模型的基础上 ,利用计算机软件对谱线进行多项式全谱拟合 ,分析实验获得的XRD图谱 ,并求得各衍射峰的积分强度 ,从而精确求出混合试样中各相物质的重量分数。文章主要工作包括 3部分 :1 根据混合物的粉末衍射谱是各组成物相的粉末谱的权重叠加 ,各相的权重因子是与该相在混合物中的体积或重量分数有关的事实 ,建立全谱多项式拟合理论 ,找出各相的权重因子 ,进而求出其重量分数 ;2 数据采集与分析 ,给出了数据的处理方法及步骤 ;3 对定量分析的结果进行了比较讨论。该方法简化了数据处理的过程 ,提高了分析结果的精度 。

关于白酒酒度的换算和勾兑的计算方法

酒精度作为白酒质量指标之一，在酒厂生产管理中显得非常重要，重点分析白酒酒度的换算和勾兑的计算方法。

Numerical analysis on the shoot resistance of heat treated light weight B-grade bulletproof steel plates

Bulletproof steel plates are widely used for the safety of special vehicles.This paper mainly researches on the shoot resistance of heat treated light weight B-grade bulletproof steel plates through numerical analysis.Based on the flow behavior of bulletproof steel plates and bullet at various high strain rates,finite element(FE) model has been set up using ANSYS/LS-DYNA software.The simulation results are compared with the shooting results,which show a good consistency and a high reliability.Therefore,the simulation results are efficient approaches and strategies to decide and select the mechanical property and thickness of bulletproof steel plates,saving a lot of work and the cost of experiments.

杠杆定律在铁碳相图中的应用

铁碳合金是应用最广泛的金属材料。在合金系中,不同成分的合金会有不同的相和组织,而这些又直接影响材料的性能及用途。所以分析给定合金的相、组织及它们的含量比是相当必要的。本文利用杠杆定律来确定给定合金在给定温度下处于二相平衡状态时,各相、各组织所占的重量百分数及它们之间的重量比。通过分析找出一般规律。

一种简单的水中泥沙颗粒分析方法

介绍一种仪器设备简单,操作简易的水中泥沙颗粒分析方法。根据不同粒径泥沙颗粒在粒径计管中的沉速不同,可以测定各种粒径泥沙颗粒的重量,从而计算出各种粒径泥沙颗粒的重量百分数。

Evaluating gravity gradient components based on a reweighted inversion method

In gravity gradient inversion,to choose an appropriate component combination is very important,that needs to understand the function of each component of gravity gradient in the inversion.In this paper,based on the previous research on the characteristics of gravity gradient components,we propose a reweighted inversion method to evaluate the influence of single gravity gradient component on the inversion resolution The proposed method only adopts the misfit function of the regularized equation and introduce a depth weighting function to overcome skin effect produced in gravity gradient inversion.A comparison between different inversion results was undertaken to verify the influence of the depth weighting function on the inversion result resolution.To avoid the premise of introducing prior information,we select the depth weighting function based on the sensitivity matrix.The inversion results using the single-prism model and the complex model show that the influence of different components on the resolution of inversion results is different in different directions,however,the inversion results based on two kind of models with adding different levels of random noise are basically consistent with the results of inversion without noises.Finally,the method was applied to real data from the Vinton salt dome,Louisiana,USA.

新型粉笔

粉笔是具有多年历史的简易书写工具,它使用方便、价格低廉,应用极为广泛。但由于其使用过程中产生粉尘较多,被吸入体内不利身体健康、同时粉笔末易于飞散,对环境也会造成污染。这里介绍一种新型粉笔,它具有与普通粉笔相似的外型和功能,书写流利,字迹易于擦掉,且几乎不产生粉尘,可以在很多场合替代通常所用的粉笔。 这种粉笔由球状物质、微粉物质、蜡状物质、润滑剂及颜料等诸成分组成。作为粉笔主体成分之一的球状物质是平均粒径为80微米的球状颗粒,可选用白炭黑、氧化铝等无机物,也可选用聚丙烯酸树脂、密胺树脂、酚醛树脂、聚乙烯树脂等有机聚合物。

Large Deviations for Sums of Heavy-tailed Random Variables

This paper is a further investigation of large deviations for sums of random variables Sn=i=1∑n Xi and S（t）=i=1∑N（t）Xi,（t≥0）, where {X_n,n≥1） are independent identically distribution and non-negative random variables, and {N（t）,t≥0} is a counting process of non-negative integer-valued random variables, independent of {X_n,n≥1}. In this paper, under the suppose F∈G, which is a bigger heavy-tailed class than C, proved large deviation results for sums of random variables.

Reconstructing Quintom from WMAP 5-year Observations:Generalized Ghost Condensate

In the 5-year WMAP data analysis, a new parametrization form for dark energy equation-of-state was used, and it has been shown that the equation-of-state, w（z）, crosses the cosmological-constant boundary w = -1. Based on this observation, in this paper, we investigate the reconstruction of quintom dark energy model. As a single-real-sealarfield model of dark energy, the generalized ghost condensate model provides us with a successful mechanism for realizing the quintom-like behavior. Therefore, we reconstruct this scalar-field quintom dark energy model from the WMAP 5-year observational results. As a comparison, we also discuss the quintom reconstruction based on other specific dark energy ansatzs, such as the CPL parametrization and the holographic dark energy scenarios.

SDCMA BLIND DETECTION IN FREQUENCY DOMAIN FOR MC DS-CDMA SYSTEMS

This paper proposes Steepest Decreasing Constant Modulus Algorithm （SDCMA） detection in frequency dornain for MultiCarrier Direct Sequence-Code Division Multiple Access （MC DS-CDMA） systems. The proposed algorithm is used to equalize independent ladings of all subcarriers. At the same time we compare the SDCMA blind detection with subspace-based Minimum Mean-Squared Error （MMSE） detection. The simulation results show that the pertbrmance of SDCMA blind detection is superior to that of subspace-based MMSE detection and the complexity of the former is much lower than that of the latter.

Orthogonal Multiple Vector-Valued Wavelet Packets

The multiple vector-valued wavelet packets are defined and investigated. A procedure for constructing the multiple vector-valued wavelet packets is presented. The properties of multiple vector-valued wavelet packets are discussed by using integral transformation and operator theory. Finally, new orthogonal bases of L^2（R, C^s×s） is constructed from the orthogonal multiple vector-valued wavelet packets.

An efficient numerical shape analysis for light weight membrane structures

The determination of initial equilibrium shapes is a common problem in research work and engineering applications related to membrane structures. Using a general structural analysis framework of the finite particle method （FPM）, this paper presents the first application of the FPM and a recently-developed membrane model to the shape analysis of light weight mem- branes. The FPM is rooted in vector mechanics and physical viewpoints. It discretizes the analyzed domain into a group of parti- cles linked by elements, and the motion of the free particles is directly described by Newton＇s second law while the constrained ones follow the prescribed paths. An efficient physical modeling procedure of handling geometric nonlinearity has been developed to evaluate the particle interaction forces. To achieve the equilibrium shape as fast as possible, an integral-form, explicit time integration scheme has been proposed for solving the equation of motion. The equilibrium shape can be obtained naturally without nonlinear iterative correction and global stiffness matrix integration. Two classical curved surfaces of tension membranes pro- duced under the uniform-stress condition are presented to verify the accuracy and efficiency of the proposed method.

Weight distribution of Preparata codes over Z_4 and the construction of 3-designs

In this paper,we calculate the number of the codewords(with Hamming weight 7)of each type in the Preparata codes over Z4,then give the parameter sets of 3-designs constructed from the supports of the codewords of each type.Moreover,we prove that the first two families of 3-designs are simple and the third family of the 3-designs has repeated blocks.

岩屑全浸入封堵效果评价方法

准确评价钻井液对微裂缝或超微裂缝地层的封堵效果,是评价钻井液防止井塌、井漏和油气层保护能力重要参考指标。通过对钻井液封堵剂的评价方法及影响因素进行研究,提出了岩屑全侵入封堵效果评价方法,该方法能够直接反应裂缝地层对封堵剂的要求,具有简单、快速、低廉的特点。

浓香型咖啡酱

日本Waarudo Natsutsu公司用咖啡豆焙炒、粉化,并与重量百分数为30-40的植物油或脂肪及重量百分数为0.5-1.0的维生素E混合,制成咖啡酱。这种咖啡酱能抗氧化,在长时期内保持有良好的咖啡香味。咖啡酱在食品的制作中有广泛的用途。

Correction of leaf nutrient resorption efficiency on the mass basis

Nutrient resorption is a crucial mechanism for plant nutrient conservation,but most previous studies did not consider the leaf-mass loss during senescence due to lack of measured data.This would lead to an underestimation of nutrient resorption efficiency(NuRE),or calculating NuRE of various species based on the average mass loss at plant-functional-group level in the literature,thus affecting its accuracy.Here we measured the leaf-mass loss to correct NuRE with the species-specific mass loss correction factor(MLCF),so as to foster a more accurate calculation of the nutrient fluxes within and between plants and the soil.Green leaves and senesced leaves were collected from 35 dominant woody plants in northern China.Mass of green and senesced leaves were measured to calculate the MLCF at species level.The MLCF was reported for each of the 35 dominant woody plants in northern China.These species averagely lost 17%of the green-leaf mass during leaf senescence,but varied greatly from 1.3%to 36.8%mass loss across the 35 species,or 11.7%to 19.6%loss across the functional types.Accordingly,the MLCF varied from 0.632 to 0.987 across the 35 species with an average value 0.832.The NuRE corrected with MLCF was remarkably increased on the whole(e.g.both the average nitrogen and phosphorus NuRE became about 9%higher,or more accurate),compared with the uncorrected ones,especially in the case of low resorption efficiencies.Our field data provide reliable references for the MLCF of plants in related regions at both species and functional-type levels,and are expected to promote more accurate calculations of NuRE.

资生堂的新创制

日本最大的化妆品厂家资生堂有限公司推出具有长效芳香与皮肤调理效能的液态或凝胶态香料组分。各主要组分的重量百分数分别为香料0.5-30、水溶性聚合物0.001-10及水份50-99,并几乎不含乙醇成份。已配制成的古龙水的重量百分数配比为:水97.39、1,3-丁二醇1.0、甘油1.0。

Some Random Coincidence Point Theorems

A class of multifunctions satisfying more general contractive inequalities is introduced and random coincidence point theorems for pairs of measurable nmltifunctions belonging to this class are proved.