蔸兰立枯病原菌及颉抗菌防治的研究

本文对１３种蔸兰，２４９个发病器官进行了病原真菌的分离，共获得真菌菌株１９２个，其中立枯丝核菌（Ｒｈｉｚｏｃｌｏｎｉａｓｏｌａｎｉｋｕｈｎ）有１１８个菌株，占整个真菌菌株的６１．４５％，用分离的立枯丝核菌ＹＫ－２６２，菌株对同色蔸兰等４种蔸兰进行了回接试验，共接４２株１３８片叶，发病叶１１２片，发病率平均８８．９％，而对照为８．３％．证明立枯丝核菌是该病的病原菌。用菌丝融合法测试，确定是一个新的菌丝融合群，按国际编号定为ＺＡＧ－８群。绿色木霉菌７８菌株对该病原菌有明显的颉抗作用，初步测定对同色蔸兰立枯丝核菌的防治有效率为８８．８％～９３．３％；对长瓣蔸兰为７７．８％～８１．１％；对带叶蔸兰为７４％．     

具有部分自由液面水平管流的理论计算方法

本文对未充满液体具有部分自由液面的圆管内的流动提出一种理论计算方法.理论可以正确预报"脱体点"的位置、流量、自由液面曲线形状等重要物理量.文中还讨论了管直径D、长度L、流体密度ρ、粘度μ及液位高度等参数对流动的影响.文中以光学玻璃连续熔炼系统中起重要作用的联接管内的流动为例作了具体计算,并与实验结果作了比较,理论与实验结果吻合良好.本文给出的理论方法可推广于一般截面形状的具有部份自由液面的管流计算.     

A High Speed Detection Scheme for Point Targets in a Multitarget Environment

The purpose of this paper is to develop a high speed detection scheme for moving and / or stationary point targets in a multitarget environment as registered in an IR image sequence. An iterative approximate 3-D line searching algorithm based upon the geometric representation of lines (for non-maneuvering targets in space) in a 3-D space is derived. The convergency of the algorithm is proved. An analysis is performed of the theoretical detection performance of the algorithm. The statistical experiment results show high effectiveness and computational efficiency of the algorithm in the case of low SNR. The idea may be employed to satisfy the real-time processing requirement of an IR system.     

Application of the Constrained Predicated Nets and Interval Logic to Production Systems

1 .INTRODUCTIONDuetotheireconomicsignificanceandclosenesstopersons,productionsystemsmustbemodeledbeforetheirimplementationanduse,thus,amethodwhichspecifies ,analyzesandsynthesizestheproductionsys tems—discreteeventsystems (DES)hasbeenestab lishedanddevelopedstepbystepinrecentyears.DESmethodspecifiestheplantbasedonitsdiscretecharacters,however,intherealworld ,therearefewplantsthatcanbemodeledbypurelydiscretemathe maticalmodelbecausetherearealwayssomecontinu ousparametersforstudyinnearlya…     

Technical Notes ：STUDIES ON THE VALUE OF SECONDARY MARKET TO THE SUPPLY CHAIN

This paper investigates the impact of a secondary market, where retailers can buy and sell excessinventories, on the supply chain. We develop a two-period model with a single manufacturer and tworetailers. At the beginning of the first period the retailers order and receive products from themanufacturer, but at the beginning of the second period, they can trade surplus products betweenthemselves in the secondary market. We investigate the impact of the correlated dependence ofretailers' demand on both the quantity effect and the allocation effect under the secondary market.Lastly,we study potential strategies for the manufacturer to increase sales with the existence of thesecondary market.     

Non-Minimum Phase Nonlinear System Predictive Control Based on Local Recurrent Neural Networks

Abstract: After a recursive multi-step-ahead predictor for nonlinear systems based on local recurrent neural networks isintroduced, an intelligent PID controller is adopted to correct the errors including identified model errors and accumulatederrors produced in the recursive process. Characterized by predictive control, this method can achieve a good controlaccuracy and has good robustness. A simulation study shows that this control algorithm is very effective.     

钢液定氧测头响应时间和热平衡态

本文分别研究了ＺｒＯ２（ＭｇＯ）固体电解质管头壁厚，参比电极量对定氧测头响应时间的影响，得出了以ＺｒＯ２管头壁厚为０．６０－０．８０ｍｍ，Ｃｒ／Ｃｒ２Ｏ３参比电极加入量为４０－６０ｍｇ所组成的定氧测头响应速度最快，同时采用了“双偶法”对定氧测头在工作过程中的热平衡态进行了研究。结果表明：氧浓差电池中的传热是响应过程的控速步骤，氧电势曲线上峰值的产生是起源于电池中的热平衡态。     

Radar Imaging Based on Iterative Algorithms

It has long been realized that the problem of radar imaging is a special case of image reconstruction in which the data are incomplete and noisy. In other fields, iterative reconstruction algorithms have been used successfully to improve the image quality. This paper studies the application of iterative algorithms in radar imaging. A discrete model is first derived, and the iterative algorithms are then adapted to radar imaging. Although such algorithms are usually time consuming, this paper shows that, if the algorithms are appropriately simplified, it is possible to realize them even in real time. The efficiency of iterative algorithms is shown through computer simulations.