A Modified Variational-Gradient Method for Quasilinear Equations

A modified variational-gradient method is proposed and substantiated for quasilinear operator equations in a Hilbert space.     

冬瓜山铜矿初步设计概算编制的几点体会

简述初步设计概算重要性,结合冬瓜山铜矿概算编制的实例,总结了编制初步设计概算的几点体会。     

保序回归的大样本性质

利用保序回归与极大似然估计之间的关系,从极大似然估计解的大样本性质出发,得到了保序回归解的两个大样本性质。     

实时数字引导中的数据处理

阐述了航天统一测控站在卫星和飞船发射过程中，实时数字引导中的数据处理。其中包括数据变换、数据的时间比对、外推估值等方法，提高了数字引导精度和设备的角度捕获能力。     

一种新的基于极大似然估计的系统辨识方法

进化计算是一种基于自然选择和自然变异机制的并行随机优化算法。由于递推极大似然估计法难以实现性能指标函数的全局寻优，所以本文提出了将改进的进化计算用于系统参数辨识的方法。计算机仿真结果表明，该算法能够实现似然函数的全局寻优。     

最大似然反褶积软件包的研制与应用

本文简明地介绍最大似然反褶积的基本原理、软件包的研制过程和应用效果。 最大似然反褶积是美国80年代研究出的一种地震资料处理新方法,它有效地解决了传统褶积模型中无法进行信噪分离的矛盾。经松辽盆地实践证明,它可以求出高分辨率和高信噪比的反射系数、最小相位化子波、合成记录、相对层速度和绝对层速度。与国外的VELOG和SEISLOG处理软件的处理结果相比,分辨率和信噪比均有很大的提高。 在软件包的研制过程中,我们主要解决了数学模型复杂和运算速度慢的问题,使最大似然反褶积在CYBER-855S计算机上成为可实用的数字处理技术。 该项技术在大庆油田朝阳沟地区进行了初步应用,结果表明,对薄层地震响应的分辨能力有明显的提高。与井岩性柱状图对比,6m以上的砂层都可以分辨出来,并且对应得比较准确。有些3m的薄层也可以找到。 该软件包的研制成功并在地震资料处理中得到应用,这在国内是首创。     

间断Galerkin方法的最优误差限

本文考虑了数性双曲方程的离散Ｇａｌｅｒｋｉｎ方法。如果精确到光滑的并且同是几乎均匀的，证明了对于分层常数元的最优的和超收敛的误差限。     

Analysis of low load transients for the Vandellòs-II NPP: Application to operation and control support

The Technical University of Catalonia (UPC) has been jointly working with the Asociación Nuclear Ascó-Vandellòs (ANAV) for a number of years in order to establish, qualify and use best estimate (BE) models for the reactors under the control of ANAV. ANAV is the consortium that is responsible for operation of the Ascó and Vandellòs-II reactors. The reactors are Westinghouse-design three-loop PWRs with an approximate electrical power of 1000 MW. The existing integral plant models for each plant are currently used for many different purposes among which are support of plant operation and control. Quite a number of studies have been done in order to improve both safety and plant competitiveness. Most of these dynamic analyses were carried out in relation to transients starting at nominal full power or at least, very close to full power. This paper develops a specific use of the Vandellòs-II plant model for operation and control support at low power involving new ranges of system actuation parameters. It also examines scenarios that are somewhat different from those typically analysed. The study starts showing the results of an assessment case, which is a start-up test and provides some additional qualification, and subsequently attempts to establish calculations to support both an improvement in feed water controls and to set up operating recommendations for low-load manual operation of feed water turbo-pump. Both results hopefully, will produce an outcome, which leads to an improvement in safety and reduces reactor trip probability.     

Search for the upper bound of Bayesian estimates of the parameter in an exponential failure model with two known quantiles of an a priori distribution function

A fast exact algorithm of searching for the upper bound of Bayesian estimates for the parameter of the exponential distribution under the condition that an a priori distribution belongs to the class of all distribution functions with two equal quantiles. This problem arises in analyzing the sensitivity of Bayesian estimates to the choice of an a priori distribution in an exponential failure model. __________ Translated from Kibernetika i Sistemnyi Analiz, No. 1, pp. 90–102, January–February 2007.