液位检测控制系统设计

本文介绍了单片机和大规模集成电路在工业液位显示、控制中的应用，解决了工业中对液位显示的复杂电路和控制上的单一性，给出了硬件电路和软件设计方法。     

A Limited-Memory Multipoint Symmetric Secant Method for Bound Constrained Optimization

A new algorithm for solving smooth large-scale minimization problems with bound constraints is introduced. The way of dealing with active constraints is similar to the one used in some recently introduced quadratic solvers. A limited-memory multipoint symmetric secant method for approximating the Hessian is presented. Positive-definiteness of the Hessian approximation is not enforced. A combination of trust-region and conjugate-gradient approaches is used to explore useful information. Global convergence is proved for a general model algorithm. Results of numerical experiments are presented.     

A Subtree-Partitioning Algorithm for Inducing Parallelism in Network Simplex Dual Updates

This paper reports on thedevelopment of a very efficient method for partitioning the networksimplex basis subtree in which dual values must be updated duringa pivot. The partitioning procedure may be concurrently executedby multiple processes. The resulting rapid decomposition of thesubtree allows an arbitrary number of processes to be utilized inthe actual dual update. This approach alleviates a primary limitationof the most efficient parallel network simplex implementationpublished to date. The new code performs at least as well as theprevious implementation on medium-scale problems and reduces averagesolution time by over 34% on large-scale problems.     

A SPARSE SUBSPACE TRUNCATED NEWTON METHOD FOR LARGE-SCALE BOUND CONSTRAINED NONLINEAR OPTIMIZATION

In this paper we report a sparse truncated Newton algorithm for handling large-scale simple bound nonlinear constrained minimixation problem. The truncated Newton method is used to update the variables with indices outside of the active set, while the projected gradient method is used to update the active variables. At each iterative level, the search direction consists of three parts, one of which is a subspace truncated Newton direction, the other two are subspace gradient and modified gradient directions. The subspace truncated Newton direction is obtained by solving a sparse system of linear equations. The global convergence and quadratic convergence rate of the algorithm are proved and some numerical tests are given.     

大型注水系统注水站合理排量的确定方法

大型注水管网系统结构复杂 ,涉及的井点、管网节点多 ,且压力、流量互相耦合 ,注水站排量合理分配难度大。以流体力学基本理论为基础 ,利用“压力谷”的性质 ,根据注水管网特性 ,建立了注水管网的基本模型 ,并在满足注水量和管路阻力损失最小的前提下 ,给出了一种确定大型注水系统注水站设计排量和运行排量的方法。实例计算表明 ,利用该方法调节大型注水系统注水站排量 ,可以使注水站和管网同时达到最优运行状态 ,并且能够科学地计算注水站的设计排量。该研究为大型注水系统的合理设计和优化运行提供了一定的理论指导     

The cluster-galaxy cross-correlation and the average infall velocity around cluster in the modified CDM models

The cluster-galaxy cross-correlation and the average infall velocity around cluster for the tilted CDM models, the hot-cold mixed dark matter models (MDM) and theA CDM models are calculated. And it is found that the prediction of the cluster-galaxy cross-correlation of theA CDM models with Ω_A=0.9, Ω_C=0.1,h=1,b = 1 or 2 is much higher than that of observation for the radius larger than 10 h⁻¹ Mpc (H₀ = 100 h.kms⁻¹Mpc⁻¹), and the other models are compatible with the observation on the scale of (3–20) h⁻ Mpc. The results can be used to compare with new observations to restrict the nature of the dark matter and the biasing factor. Project supported by the National Natural Science Foundation of China (Grant No. 19733001).     

Designing information structures for quadratic decision problems

This paper investigates the problem of unconstrained optimization when there is only partial information on the random parameters in the objective function. The relation between the optimization performance and the available information is established. The best information structure design with fixed rank is described. The designing procedure is set up in such a way that successive information augmentation or deletion can be considered. The procedure can also be extended to multiperson decision problems.     

用楔角偏差改善光楔列阵系统焦线的大尺度不均匀性

在加工光楔列阵线聚焦系统时，人为地使各单元楔角与精确的理论值之间存在一定的偏差，以使单元衍射引起的大尺度不均匀性得到改善，文中进行了理论计算和实验验证，在既能改善均匀性，又能保证一定的焦线能量利用率的情况下，给出了合理的偏差数据，为优化均匀聚焦系统的工程设计提供了必要的依据。     

Lp-based combinatorial problem solving

A tutorial outline of the polyhedral theory that underlies linear programming (LP)-based combinatorial problem solving is given. Design aspects of a combinatorial problem solver are discussed in general terms. Three computational studies in combinatorial problem solving using the polyhedral theory developed in the past fifteen years are surveyed: one addresses the symmetric traveling salesman problem, another the optimal triangulation of input/output matrices, and the third the optimization of large-scale zero-one linear programming problems.     

丘陵地区高速公路景观设计研究

以G85成渝高速公路（永川段）为例,探讨丘陵地区高速公路生态用地的帚观规划以及建设模式．在剖析公路景观中4个典型区域的规划模式及其植被配置方式的基础上,提出大尺度景观的设计理念：根据公路途经地域的不同,设计田园乡村绿化景观、山地丘陵绿化景观和村镇绿化景观,以展示沿途的田园风光、山地风景和村镇绿化景观;结合有色植物的合理配置,展示景观动态．