A fast algorithm for the generalized parametric minimum cut problem and applications

Many combinatorial optimization problems are solved by a sequence of network flow computations on a network whose edge capacities are given as a function of a parameter λ. Recently Galloet al. [7] made a major advance in solving such parametric flow problems. They showed that for an important class of networks, calledmonotone parametric flow networks, a sequence ofO(n) flow computations could be solved in the same worst-case time bound as a single flow. However, these results require one of two special assumptions: either that the λ values are presented in increasing or decreasing order; or that the edge capacity functions are affine functions of λ. In this paper we show how to remove both of these assumptions while obtaining the same running times as in [7]. This observation generalizes and unifies the two major results of [7], and allows its ideas to be applied to many new combinatorial problems. Of greatest importance, it allows the efficient application of binary search and successive binary search to a sequence of network flow problems.     

初论带状光纤缆结构设计

推导出了成叠带状光纤在松套管中余长的两个计算公式，此两公式是带状光纤缆结构设计需要用到的基本公式。此外，还对带状光纤缆结构设计作了初步讨论。     

双臂协调约束系统动力学问题探讨

本文讨论了双臂协调约束系统的动力学问题．文中系统地描述了该系统的适应于计算机程序化的建模方法；推导了系统的动力学方程，并给出了用约束矩阵的正交补矩阵处理系统所受协调约束的方法；编制了相应的计算机辅助分析程序ＤＲＣＲＣＳ，并用该程序对算例进行了动力学的数值分析。     

Apolipoprotein(a) concentrations in type 2 (non-insulin dependent) diabetic patients from Romania

Several studies suggested that lipoprotein (a)-Lp(a) is an independent atherogenic risk factor. Since non-insulin-dependent diabetes mellitus (NIDDM) is characterized by an increased risk of coronary heart disease (CHD) as related to the general population, the main purpose of our study was to compare the plasma levels of apolipoprotein (a)-(apo) (a) in 30 NIDDM patients hospitalized in our department, and in 20 non-diabetic controls from Timi?oara. Apo (a) values were similar in the two groups (medians, 95% confidence intervals 57 (50-107) in NIDDM versus 58 (51-106) U/l in controls; p = 0.9097). We found weak correlations between apo (a) and hemoglobin A1 (HbA1) (r = 0.42). A significant association was noticed between apo (a) and apo B, both in NIDDM (r = 0.71) and in control subjects (r = 0.81) p < < 0.001. The diabetic patients were screened for microalbuminaria with the MICRAL-test and we compared apo (a) levels in those having albumin excretion values above and under the cut-off point (20 mg/l). Apo (a) concentrations were similar in both samples. We found no association between apo (a) and plasma lipid values. NIDDM patients on fair glycemic control have similar apo (a) concentrations to non-diabetic subjects and they do not seem to be influenced by diabetes duration, HbA1, microalbuminuria and plasma lipid values Apo (a) and apo B are significantly correlated, both in diabetic and non-diabetic subjects.     

建立统计宏模型的新方法

本文介绍一个新的建立统计宏模型的系统，它采用新的方法，得到简化的二次多项式，这种形式便于优化处理，适用于容差设计。     

Heat and Moisture Transfer in Wet Sand Exposed to Solar Radiation—Models and Experiments Concerning Buried Objects

One promising method of locating buried objects, such as land mines, is to use optical systems for detecting contrasts in surface temperature. With enhanced knowledge about the interacting physical processes behind these temperature contrasts, it is possible to improve detection precision. In such a context, moisture movement in the soil and moisture evaporation from the surface have been found to be of particular interest. This study was based on indoor experiments on wet and dry sand exposed to radiation from a solar panel. Simulations of heat and moisture transfer conducted with a one-dimensional model are also presented for the experiments. The calculations were successful in accurately predicting surface temperatures for both wet and dry sand, making it possible to predict surface temperatures under different conditions. These findings will contribute to increasing the probability of successful detection of buried objects under real conditions using optical methods.     

砷化镓声电荷转移延迟线的设计与工艺研究

由于声电荷转移(ACT)这一新颖的高速缓冲抽样技术的发明,使得新一代高速高频信号处理器件的实现成为可能。本文研究了第二代平面结构的ACT器件转移沟道的电位分布特性,给出了平面结构ACT延迟线的设计,并研究了ACT器件的工艺实现。     

聚腈分子的飞秒时间分辨光克尔效应

本文利用飞秒时间分辩光克尔效应，对主链为Ｃ＝Ｎ结构的两种共轭聚腈高分子的溶液和薄膜进行研究，所测得的时间分辨光克尔信号均表现为超快响应。