采用直接搜索法进行二氧化硫催化反应器的最佳化设计

本文建立了采用Ｓ１０１型催化剂的两次（３＋１）四段间接换热式催化反应器的数学模型，应用ｐｏｗｅｌｌ（鲍威尔）直接搜索最优化方法计算各段始末温度与转化率，可定量计算出转化器催化床的高度，本文提出的设计方法也可用于多段直接换热式二氧化硫催化氧化反应器。     

随机时分神经计算理论用于视觉曲线自激增强

利用空间分布满足曲线规则(位置和定向连续性)的局部刺激之间的相互激励,称为曲线自激,这是发现视觉边界曲线和抑制局部噪声的有效手段.过去的工作均采用并行结构区分的计算方式,曲线自激并没有达到满意的效果.本文提出随机时分动态自激的计算方案,对不同的曲线实施随机时分的搜索、时间一致性滤波、和自激积累等机制.本文给出了实现的原理方案.     

Spent potliner treatment process optimization using a MADS algorithm

In this paper, the general problem of chemical process optimization defined by a computer simulation is formulated. It is generally a nonlinear, non-convex, non-differentiable optimization problem over a disconnected set. A brief overview of popular optimization methods from the chemical engineering literature is presented. The recent mesh adaptive direct search (MADS) algorithm is detailed. It is a direct search algorithm, so it uses only function values and does not compute or approximate derivatives. This is useful when the functions are noisy, costly or undefined at some points, or when derivatives are unavailable or unusable. In this work, the MADS algorithm is used to optimize a spent potliners (toxic wastes from aluminum production) treatment process. In comparison with the best previously known objective function value, a 37% reduction is obtained even if the model failed to return a value 43% of the time.     

Tracking and inferring spatial rotation by children and great apes.

Finding hidden objects in space is a fundamental ability that has received considerable research attention from both a developmental and a comparative perspective. Tracking the rotational displacements of containers and hidden objects is a particularly challenging task. This study investigated the ability of 3-, 5-, 7-, and 9-year-old children and great apes (chimpanzees, bonobos, gorillas, and orangutans) to (a) visually track rotational displacements of a baited container on a platform and (b) infer its displacements by using the changes of position or orientation of 3 landmarks: an object on a container, the color of the containers, and the color of the platform on which the containers rested. Great apes and 5-year-old and older children successfully tracked visible rotations, but only children were able to infer the location of a correct cup (with the help of landmarks) after invisible rotations. The ability to use landmarks changed with age so that younger children solved this task only with the most explicit marker on the baited container, whereas older children, particularly 9-year-olds, were able to use landmark orientation to infer correct locations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A current-bearing rectangular frame as a field source for certifying electromagnetic search systems

It is shown that a rectangular ungrounded current-bearing loop can be used for the metrological certification of electromagnetic search systems designed to locate and examine underground conductors. Criteria are formulated for choosing the sizes of such loops. __________ Translated from Izmeritel’naya Tekhnika, No. 4, pp. 57–62, April, 2008.     

随机时滞网络控制系统的后退时域估计

本文考虑具有随机观测时滞系统的后退时域估计问题.首先,针对随机时滞网络控制系统,运用观测重组技术,将带有时滞的观测方程转化为无时滞观测方程,得到一组新的无时滞观测序列.在此基础上,运用线性最小方差无偏估计理论,推导出后退时域估计器的批形式公式和迭代形式公式,并给出稳定性分析.通过具体的仿真实例,对比现有卡尔曼滤波器,验证了所提出的后退时域估计器具有更好的跟踪能力.     

An ATM Switch Capacity Allocation Problem

In this paper, we consider a capacity allocation problem arising in the context of deploying asynchronous transfer mode (ATM) networks. Given types of ATM switches, the problem is to find an optimal allocation of capacity such that the total cost of installed switch modules is minimized, while satisfying all traffic demands. We formulate the problem as an integer programming model, which can be conceptualized as a generalized bin packing problem with capacity constraints. We then develop a surrogate constraint technique of the formulation for enhancing the representation of the model. Guided by the tight lower bound of the surrogate relaxation, we devise an effective tabu search heuristic that provides good quality solutions with guaranteed optimality. We present promising computational results that show the viability of the proposed heuristic and lower bounding methods, and that provide insights into implementation for configuring ATM switch in practice.     

含偶氮苯单元光响应多肽的研究进展

综述了含偶氮苯光色性单元的多肽光响应效应，主要包括光诱导的无规线团与右手α-螺旋之间的转变；左、右手-α-螺旋的反转；光激发的聚集-解聚过程以及由多肽形成的单层膜光力学效应。这些效应表明光响应多肽是一类很有前景的光响应化合物，可作为设计光调节传感器等光响应装置的合适材料。     

海洋钻井装置随动电缆桥设计

在海上钻井平台上钻丛式井时，必须解决各种电缆束和防喷器控制管缆的随动问题。国产钻井平台“渤海5号”和“渤海7号”是解决各种电缆束和防喷器遥控管缆随动问题的成功范例。     

Adaptive random access algorithm with improved delay performance

We propose an adaptive random access algorithm for mobile environments with capture. The algorithm has a dynamic window size which is updated according to the traffic intensity. The packet arrival rate is tracked by employing sequential detection procedures. Simulations indicate that reducing the window size adaptively under heavy load conditions improves the average delay significantly. Copyright © 2001 John Wiley & Sons, Ltd.