一种基于高频噪声定量约束函数的地震高分辨率处理方法

系统分析了现有地震数据高分辨率处理方法的适用性及不足,探索了一种基于高频噪声定量约束函数的高分辨率处理方法,有效且保真地提高地震资料信噪比与分辨率。通过分析叠后地震数据有效信号带宽,设计了压制高频噪声的最大概率准则和定量约束函数,通过多次迭代压制噪声,提高全频带信号的信噪比,逐步分级拓宽地震有效频带宽度,循环迭代求取反射系数,将提取的地震子波与反射系数褶积得到高分辨率地震数据体。测试校验对比其它高分辨率地震处理结果,处理后的数据体具有垂向分辨率高、主频高且频带宽的特点,有效视主频由50 Hz提高至100 Hz左右,地质目标视分辨率相应提高近1倍。基于该提频数据与波阻抗反演实现了2~5 m地质目标的定性与定量预测,钻井验证符合率90%以上,有效指导井位部署。该方法弥补了在传统“有效带宽”内提高地震高频信号的不足,实现了全频带内重构高、低频有效信号的目的。

基于多元函数逼近的高频振动时效工艺参数研究

为揭示工艺参数独立作用和交互作用对高频振动时效效果的影响规律,提出基于多元函数逼近的高频振动时效工艺参数研究方法。基于多元函数逼近法建立高频振动时效效果与工艺参数之间的定量化函数模型,给出定量化函数模型的实验构建方法,并基于实验数据构建定量化函数模型,在此基础上研究独立工艺参数和工艺参数的交互作用对高频振动时效效果的影响。结果表明:单个工艺参数独立作用时,高频振动时效效果受到激振频率的影响最大,其次是激振振幅;工艺参数交互作用时,高频振动时效效果受激振频率和激振振幅的交互作用的影响最大,其次是激振频率和激振时间的交互作用。基于多元函数逼近的高频振动时效工艺参数研究方法的提出,为揭示工艺参数独立作用和交互作用对高频振动时效效果的影响提供了技术思路,同时为高频振动时效工艺参数的制定提供了参考,具有一定的工程应用价值。

基于定量修正层次分析的变压器性能评估方法研究

电力变压器是电网电力输送中的核心电气设备,合理评估变压器的性能对保证电力系统稳定运行意义重大。文中根据变压器故障的原因和评价指标来源,提出了基于定量修正层次理论的变压器性能评估方法。针对变压器性能评估指标体系中评价因素结构复杂、数量庞大的问题,首先依据指标体系中反映变压器故障的准确程度,筛选出能够反映变压器绝缘性能、油性能、过热性故障和放电性故障的关键指标,建立了变压器性能评估关键指标体系;其次利用层次分析法并结合定量修正评分函数,确定指标的最优权重,得到各指标的评分值,有效抑制了主观因素对性能评估的影响;最后选取两台不同电压等级的变压器为实例进行性能评估,验证所用方法的合理性和实用性。

用声波时差研究泥岩盖层毛细管封闭能力

通过泥岩排替压力与孔隙度及孔隙度与声波时差之间关系的分析 ,建立了泥岩排替压力与声波时差之间的定量函数关系。根据此关系 ,利用声波时差可获得大量的排替压力信息 ,据此不仅可以研究泥岩盖层毛细管封闭能力的剖面变化特征 ,而且还可以研究泥岩盖层毛细管封闭能力的平面变化特征。通过泥岩排替压力与声波时差之间的函数关系 ,利用声波时差资料较容易地确定泥岩盖层毛细管封闭能力形成时期 ,结合烃源岩的大量排烃期可以判断泥岩盖层毛细管封闭油气的有效性。塔里木盆地的实例应用结果表明 。

地质统计学方法概要

使用测井数据对地震属性进行标定,寻求两类数据的一种线性的或非线性的定量函数关系,根据这种函数关系,可将地震属性转换为希望的储层物性。地震属性标定和储层物性转换使用着地质统计学方法。本文对现用的地质统计学方法做了系统介绍。这些方法包括多元统计分析、相关滤波技术、克里金预测技术、协克里金方法和利用相关学科知识实现参数的转换。

The Asymptotic Stability for a Class of Nonlinear Large Sceale System

This paper an cited instances in illustration of the incorrectness of the criteria of asymptotic stability of a class of nonlinear large seale system that L_j·T·Grujie gave in paper [1] by the comparison theory and then corrected it,and has given the sufficient conditions of the asymptotic stability.

建筑与建材

1.自应力混疑土压力管技术改造 该技术是根据各生产厂不同的生产条件,应用二元弹性理论精确计算自应力砼压力管,提出各种口径自应力砼压力管的环向自应力提高系数;采用数理统计方法,确定自应力和配筋率间的定量函数关系,以便规划各种口径自应力砼压力管的合理环向配筋率;

The quantified analysis of China's GM cotton yield capacity by C-D function and stochastic frontier model

Using a modified C D function and stochastic frontier model, the paper analyzed China's cotton yield capacity and found that the yield and technical efficiency of China's cotton planting system can be increased by the use of genetically modified (GM) varieties.

海洋大气环境下装备腐蚀量预测

针对装备腐蚀影响战备值班时间、技术状态完好性等问题,提出一种装备腐蚀剩余寿命的预测方法。在分析海洋大气环境要素对装备腐蚀影响的基础上,结合金属大气腐蚀量随时间变化的幂函数方程,建立不同环境特征下的环境当量谱,利用加速腐蚀折算方法,按照等效原理,采用实验室环境的加速腐蚀,预测装备在海洋大气实际环境下的腐蚀寿命。结果表明:该模型具有良好的拟合效果,有一定的可靠性。

On the structural features of fiber suspensions in converging channel flow

The structural features of fiber suspensions are dependent on the fiber alignment in the flows. In this work the orientation distribution function and orientation tensors for semi-concentrated fiber suspensions in converging channel flow were calculated, and the evolutions of the fiber alignment and the bulk effective vis-cosity were analyzed. The results showed that the bulk stress and the effective viscosity were functions of therate-of-strain tensor and the fiber orientation state ; and that the fiber suspensions evolved to steady alignment and tended to concentrate to some preferred directions close to but not same as the directions of local stream-lines. The bulk effective viscosity depended on the product of Reynolds number and time. The decrease of ef-fective viscosity near the boundary benefited the increase of the rate of flow. Finally when the fiber alignment went into steady state, the structural features of fiber suspensions were not dependent on the Reynolds numberbut on the converging channel angle.

Exact Wave Function of a Time-Dependent Quantum System

To solve the problem in dispute about a Schrdinger equation with time-depenelent mass and frequency, by means of a simple transformation of variables, the time-dependent Schrdinger equation is transformed into the time-independent one first and then an exact wave function can be found.

Minimum Cross Fuzzy Entropy Problem, The Existence of Its Solution and Generalized Minimum Cross Fuzzy Entropy Problems

In the present study we have formulated a Minimum Cross Fuzzy Entropy Problem （Minx（F）EntP） and proposed sufficient conditions for existence of its solution. Mentioned problem can be formulated as follows. In the set of membership functions satisfying the given moment constraints generated by given moment functions it is required to choose the membership function that is closest to a priori membership function in the sense of cross fuzzy entropy measure. The existence of solution of formulated problem is proved by virtue of concavity property of cross fuzzy entropy measure, the implicit function theorem and Lagrange multipliers method. Moreover, Generalized Cross Fuzzy Entropy Optimization Methods in the form of MinMinx（F）EntM and MaxMinx（F）EntM are suggested on the basis of primary phase of minimizing cross fuzzy entropy measure for fixed moment vector function and on the definition of the special functional with Minx（F）Ent values of cross fuzzy entropy measure. Next phase for obtaining mentioned distributions consists of optimization of defined functional with respect to moment vector functions. Distributions obtained by mentioned methods are defined as （MinMinx（F）Ent）m and （MaxMinx（F）Ent）m distributions.

Hamilton Number Neural Network Model

The stability and the sequential dynamics of the sixteen-state Hamiltnn neural network model have been discussed with the energy function. The optical implementation scheme about Hamilton number vector-matrix multiplication is simply discussed.

SIMULATED ANNEALING BASED POLYNOMIAL TIME QOS ROUTING ALGORITHM FOR MANETS

Multi-constrained Quality-of-Service (QoS) routing is a big challenge for Mobile Ad hoc Networks (MANETs) where the topology may change constantly. In this paper a novel QoS Routing Algorithm based on Simulated Annealing (SA_RA) is proposed. This algorithm first uses an energy function to translate multiple QoS weights into a single mixed metric and then seeks to find a feasible path by simulated annealing. The pa- per outlines simulated annealing algorithm and analyzes the problems met when we apply it to Qos Routing (QoSR) in MANETs. Theoretical analysis and experiment results demonstrate that the proposed method is an effective approximation algorithms showing better performance than the other pertinent algorithm in seeking the (approximate) optimal configuration within a period of polynomial time.

Prediction of Fluid Velocity Distribution near a Rising Bubble

A model is presented for predicting the fluid velocity distribution around a rising bubble which startsfrom rest on a distillation column tray by considering the unsteady fluid flow based on the method of streamfunction. Experimental measurement of the velocity distribution by using whole field digitized PIV (particle imagevelocimetry) method is briefly described. The velocity distribution predicted by the present model is in betteragreement with the measurements than the others models published in literature.

长江中下游地区典型湖泊摇蚊亚化石-湖水总磷定量模型研究

长江中下游地区30个典型湖泊表层摇蚊幼虫亚化石-环境数据库研究表明影响该地区湖泊中摇蚊组合的主导因素为营养态梯度．12个水质环境指标的典型对应分析(CCA)揭示总磷为解释摇蚊幼虫亚化石组合变化的最重要的显著性指标,可解释20．1％的摇蚊幼虫亚化石组合变化信息,适于进行定量模型的建立．依据总磷的DCCA分析,利用非线性的多元回归方法,建立了摇蚊幼虫亚化石-湖水总磷转换函数模型．最佳二次次残差提取的WA-PLS模型为摇蚊幼虫亚化石-总磷转换函数推导提供了最高的实测值与推导值的回归相关系数(R2jack=0．76)和较低的推导误差(RMSEPjack0．13)．最后,对模型的推导能力进行了综合评价．该模型的建立为定量研究该地区湖泊富营养化的历史开拓了新途径,并为湖泊环境管理与生态修复提供了科学依据．

The quantification of quantum nonlocality by characteristic function

We propose a way to measure the strength of quantum nonlocal correlation (QNC) based on the characteristic function, which is defined as a response function under the local quantum measurement in a composite system. It is found that the strength of QNC based on the characteristic function is a half-positive-definite function and does not change under any LU operation. Generally, we give a new definition for quantum entanglement using the strength function. Furthermore, we also give a separability-criterion for 2×m-dimensional mixed real matrix. This paper proposes an alternative way for QNC further research.

Climatic and Edaphic Controls on Soil pH in Alpine Grasslands on the Tibetan Plateau,China:A Quantitative Analysis

Soil acidity is an important parameter that can regulate ecosystem structure and function.However,a quantitative understanding of the relationships between soil pH and environmental factors remains unavailable.In this study,relationships of soil pH with both climatic and edaphic factors in alpine grasslands on the Tibetan Plateau,China were quantified using data obtained from a regional soil survey during 2001-2004.Our results showed that soil pH decreased along the gradient of both mean annual temperature and precipitation.Likewise,soil pH exhibited consistent negative correlations with soil moisture and silt content.However,soil organic and inorganic carbon contents played opposite roles in shaping patterns of soil pH:the accumulation of soil organic matter led to higher soil acidity,while the existence of soil inorganic matter was favorable for maintaining higher soil alkalinity.The variation partitioning analysis indicated that the combination of climatic and edaphic variables explained 74.3%of the variation in soil acidity.These results suggest that soil pH could be predicted from routinely-measured variables,allowing a robust pedotransfer function to be developed.The pedotransfer function may facilitate land surface models to generate more reliable predictions on ecosystem structure and function around the world.

Reducing subspaces of multiplication operators with the symbol αz^k+ βw^l on L_a^2(D^2)

Multiplication operators defined on function spaces have been receiving enormous attention from both operator-theoretic and function-theoretic experts. One of the problems is to study reducing subspaces of them. The one-variable case has obtained fruitful remarkable results. However, little has been done in the multi-variable case. Under the setting of the Bergman space L2a(D2), this paper addresses those multiplication operators Mp defined by special polynomials p, where p(z, w) = αzk+ βwl, α, β∈ C. Those reducing subspaces of Mp are completely determined.

A quantitative reconstruction of the paleoenviornmental variations of the South Yellow Sea inner shelf based on benthic foraminiferal transfer functions

Transfer functions between the benthic foraminiferal fauna of seventy-one sediment surface-samples retrieved from the South Yellow Sea inner shelf and the environmental factors, including the summer bottom-water salinity(Ss), the summer bottom-water temperature(Ts) and the winter bottom-water temperature(Tw) have been developed utilizing weighted averaging partial least square regression(WA-PLS). Subsequently, the transfer functions have been applied to a late Holocene piston core SY01 from the South Yellow Sea inner shelf, established the variation curves of the Ss, Ts, and Tw during the last 3.9 cal. ka. The Ss and Ts showed a nearly synchronous trend to the published stalagmite δ18O curve from the Jiuxian Cave, meaning they could be used as reliable indicators for the summer monsoon. Similarly, the Tw could be used as an indicator for the winter monsoon for its synchronous change to the insensitive grain size variation of the core ZY-2 retrieved from the Central Yellow Sea mud area. These results suggest that transfer functions based on benthic foraminiferal fauna can be a potentially useful tool in palaeoceanographic and palaeoenvironmental research along the Chinese seaboard.