基于PLC的远程气力输送自动投饵控制系统的设计与实现

为提高水产养殖投饵的自动化和工业化水平，满足现代水产养殖精确投饵的需要，研发了国内第一套远程气力输送自动投饵系统，并设计了以PLC为控制核心，集编程、传感器等技术为一体的自动化控制系统。介绍了设备的主要结构、工作原理、控制系统硬件选型及编程方法。在GX—DEVELOPER-8．34环境下采用梯形图语言编制系统运行和监控软件，实现投饵作业的精确计量、自动控制和人性化操作。检测结果表明，该自动投饵系统基本达到设计要求，风机排气压力在49．0kPa时管道远程输送距离达到300m以上，投饵速率达1586kg·h^-1，证明该设备能有效提高投饵效率和质量。     

农作物轮灌PLC自动控制系统设计与实现

介绍了农作物轮灌可编程自动控制系统的硬件配置，软件设计与实现方法及系统维护经验。该系统具有可靠性高，控制功能强的特点，可以提高喷灌的效率。     

Design of PCI Bus Controller Based on I/O Transmit

With the microcomputer improving and multimedia and wideband network developing. the I/O bandwidth requires more and more. The last standard bus, for example, ISA, EISA and MC can not be satisfied with the demand of the modern technology. In this case, the PCI bus appears, and become the master standard bus. Now there are two methods to realize the PCI Controller circuit, which are the special chip and the programming logic chip. The PCI system structure is introduced,and a PCI Bus Controller is Fealized based on the I/O transmit through using a Lattice1032E chip. Which has proved successful by application.     

Organically Combinatorial Inference and Optimization in Intelligence System

The inference algorithm is the most important part in intelligence system because the level of intelligence in the system is decided by it. By means of the mutual benefit for inference algorithm of expert system ,fuzzy logic and neural network ,the combinatorial inference technology which is organically composed of these three parts is put forward for inference mechanism in intelligence system. The optimization decision model is also set up. In order to bring all the advantage of every inference algorithm into play and overcome the disadvantage of single inference algorithm the common expert knowledge base is applied to organic combination and concurrent operation of all inference algorithm. In order to realize knowledge share the inference results are optimized by decision technology optimization. The research results show that the organized combinatorial inference and optimization can be applied in engineering practice effectively and is benefit for raising the inference level.     

立体布尔函数边界的代数解及用于立体造型

由地称的色觉机制数学模型所提出了的一种连续值逻辑，得到了线面体布尔函数边界的代数解，文中提供了一立体布尔函数Ａ－Ｂ边界求解的例子和相应的程序绘图。     

优化组合逻辑设计的卡诺图单向化简法

在传统的组合逻辑网络设计中卡诺图化简法的基础上 ,在构建卡诺图、变量分组的同时 ,仔细斟酌逻辑变量在逻辑函数以及某一通用中规模集成电路 (MSI)组件中的地位 ,以确定卡诺图的行变量和列变量 ,从而提出“卡诺图单向化简法” .该方法在多变量组合逻辑设计中 ,尤其是使用数字选择电路 (MUX)组件构成各种逻辑函数发生器时 ,既可避免“降维图法”的繁琐规定和步骤 ,又可以避免“分离变量法”中对任意项的试探性步骤 ,简化方案优选过程 .无论对于完全描述的逻辑函数 ,还是非完全描述的逻辑函数均适用 .尤其对于任意项的处理 ,运用该方法可以一次确定其最佳组合 ,迅速找到组合逻辑设计的最优方案 ,简单、易行     

概率加密方案的一个注记

The two-valued unapproximable trapdoor predicate of probabilistic encryption is extended to the multivalued unapproximable trapdoor predicate in this paper. The corresponding encryption and deoryption algorithm are given. It is proved that the extended pr     

佛教因果观与六朝至初唐志怪小说

中国志怪类小说脱胎于古代神话，到了魏晋南北朝，志怪小说才发展成为一种独立的小说类型。与此同时，于汉末传入中国的佛教也逐渐摆脱了道教的附庸地位，开始正式在中国社会宣传自己的宗教思想。而佛教观念中最基本的因果观，随着佛教的传播渗透到社会生活的方方面面，反映在小说中，即是志怪小说中出现了大量宣扬因果报应的故事。佛教因果观不仅为六朝以后的志怪小说提供了新的素材，而且其思想还深入到了小说的叙事逻辑结构之中。     

Manure as a key resource within smallholder farming systems: Analysing farm-scale nutrient cycling efficiencies with the NUANCES framework

Smallholder farmers in Africa recognise the important role of manure in maintaining soil fertility. For smallholder farmers who use little fertiliser, efficient management of nutrients in manure is key for crop production. We describe a simple model to analyse the effect of manure management on the efficiency of mass and nutrient retention. We used on-farm data on manure excreted and manure management, experimental results, literature and fuzzy logic to model losses during manure storage. The model was used to analyse N cycling efficiency (NCE) within smallholder farms in western Kenya. Simulations showed that manure management during collection and storage had a large effect on the efficiency of C and nutrient retention. Differences in NCE between farmers of different wealth classes arose due to differences in resource endowment. For poorer farmers, large N losses occur at all stages of manure recycling. Urinary-N losses occurred on all farms but their impact on NCE for poor and medium-class farmers was larger due to the smaller amount of N recycled. With current management the poor farmer recovered < 1 kg N y^− 1 in composted manure from 15 kg N y^− 1 excreted. Improved manure storage had little effect on increasing overall NCE for the poor farmer due to large losses before storage. For the wealthier farmer improvement of manure storage increased NCE and allowed recycling of 30% of N excreted (ca. 30 kg N y^− 1) with small investment in infrastructure. Covering manure heaps with a polythene film reduced mass and N losses considerably. For the poor to increase overall NCE, investment in cattle housing and recycling of urinary-N is required. Increasing cattle numbers or improved feeding would have a larger effect on manure availability but this is constrained by feed scarcity and investment capacity. The absolute amounts of N recycled (1–6, 4–17 and 7–18 kg N y^− 1 for poor, medium and wealthier farmers) were small compared with maize N demand (> 50 kg N ha^− 1), but significant given the small farm sizes (0.1–1.1 ha). Although absolute amounts of N recycled with improved manure management may have little immediate impact on crop productivity, manure is often the only input available. Manure provides other nutrients for crops and maintains soil organic matter — both vital to guarantee efficient use of fertiliser N — which justifies the search for interventions to assist farmers make better use of manure.