在DELPHI5.0平台上利用NETBIOS设计网络通讯软件的探讨

在组建六道湾煤矿企业信息网的过程中,我们利用DELPHI5.0平台所提供的NET-BIOS接口单元,解决了从企业原有的专用网络上获取广播数据包的异构网络间通讯问题,本文介绍了DELPHI5.0平台所提供的NETBIOS接口单元的组成及主要功能,并详细说明了网络广播数据包接收器的编程方法.     

Realizing 3 Layers Transport Model in the Communication Between Embedded System and PC

This article puts forward a 3 Layers Model for the communication between embedded system and PC. It is based on the speciality of them and the TCP/IP model. The model defines the communicate process of embedded system to be three layers: Transport Layer, Control Layer and Application Layer. Each layer serves for its higher-up. It can keep the efficiency and credibility of the communicate process and the authors prove and analyse that in the article. the concept of the model is also suitable for Bluetooth, IrDA and other kinds of communication about embedded system.     

File Intertransmission Based on WinSock Component

WinSock is a group of API,which is used to transmit data and exchange information on Internet,the Socket Application programme impoldered by users may communicate with other Socket Application programes by Internet. Delphi provides Socket components,which sustains the TCP/IP protocol and makes the Internet programming acquiring much more flexibility.This paper probes that how to realize transmission of files in any format under nonblocking mode between clients and servers by means of Socket components of Delphi.     

土壤中毒死蜱及主要代谢产物的降解与生态风险

为探讨施用农药毒死蜱后土壤中毒死蜱及其主要降解产物3,5,6-三氯吡啶-2-酚（TCP）污染分布特征,评估农田土壤环境中毒死蜱及TCP的环境风险,以玉米、小麦和大豆3种作物农田为研究对象,开展旱地农田田间试验。通过对施用后不同时间农田土壤中毒死蜱浓度检测发现,土壤中毒死蜱均在前期消解较快,后期逐渐变缓。小麦、大豆、玉米种植土壤中毒死蜱的半衰期为7.86~24.84 d（均小于30 d）,消解速率常数为0.027 9~0.088 2 d^-1。前期均表现为0~5 cm土壤中毒死蜱残留量最大,15~20 cm土壤中毒死蜱残留量最小,即随着深度的增加土壤中毒死蜱的残留量逐渐降低;随着时间的延长,0~10 cm土壤中毒死蜱残留量逐渐减少,10~20 cm土壤中毒死蜱残留量逐渐增加。TCP比母体毒死蜱更容易迁移,对环境的污染风险较高。随着毒死蜱施用剂量的增加,小麦、大豆、玉米3种作物种植土壤中毒死蜱及TCP的短期和长期生态风险均增大。超推荐剂量施用毒死蜱导致毒死蜱及TCP产生较高的短期和长期生态风险,TCP生态风险在3种作物农田中均达到了高风险等级。     

菊花BRC1b基因的分离与亚细胞定位

以切花菊‘神马’(Dendranthema grandiflora‘Jinba’)为材料,利用同源基因克隆法结合RACE技术克隆了侧枝相关重要基因BRANCHED1类似基因,命名为DgBRC1b。该基因开放阅读框有1 008bp,可编码335个氨基酸。蛋白对比发现,DgBRC1b所推测的氨基酸序列包含TCP家族转录因子的2个基本结构域。通过系统遗传进化树分析进一步表明DgBRC1b属于TB1亚家族。洋葱表皮亚细胞定位结果表明该基因定位于细胞核,进一步证明该基因可能为转录因子。     

开放性网络互连技术的探讨

从计算机通信网络的开放性原理出发,阐述了网络互连的技术,重点解释了多种主机、多类协议的网络兼客与互连的技术。     

Guided bone regeneration with beta-tricalcium phosphate and poly L-lactide-co-glycolide-co-epsilon-caprolactone membrane in partial defects of canine humerus

This study was performed to evaluate the effect of beta-tricalcium phosphate and poly L-lactide-co-glycolide-co-epsilon-caprolactone (TCP/PLGC) membrane in the repair of partial bone defects in canine proximal humerus. Three adult mixed-breed dogs were used during the experimental period. The length of the defect was quarter of the full length of humerus, and width of the defect was quarter of middle diameter of the lateral aspect of humerus. The humeri of each dog were divided into treatment (TCP/PLGC) and control groups. The defect was covered with TCP/PLGC membrane in treatment group. To evaluate regeneration of the bone, computerized tomography (CT) and histopathologic examination were performed. The radiopaque lines were appeared at the original defect sites in TCP/PLGC group but below the original site in control at 4th week. Radiopacity and thickness of the defect sites, and radiopaque lines were more increased at 8th week than those of 4th week. Histopathologic findings revealed fibrous connective tissue migration into the defect and the migration inhibited the structure of new cortex to be placed in the original level in control whereas new cortex growth was found in the level of original line in TCP/PLGC group. However, the new cortical bone in the TCP/PLGC group was thinner and less organized than the adjacent intact cortex, and the amount of new cancellous bones were also scanty. The result suggested that TCP/PLGC membrane is a good guided bone regeneration material to restore the original morphology of humerus in partial defect.     

TCP/IP协议脆弱性分析

TCP/IP协议是网络发展的一个基础，但是该协议确存在着致命的弱点，盲目的使用与该协议相关的服务或应用会给网络安全带来隐患，认识到TCP/IP协议的脆弱性进对我们加强网络管理和采用安全技术手段具有指导性作用。     

嵌入式远程农业信息采集终端的设计与实现

采用嵌入式网络模块NetBox2，利用其网络接口和TCP／IP协议库进行二次开发，实现了一个远程农业信息采集客户端。支持人工观测数据和农业数据检测仪器两种方式下的农业数据采集、远程传输和存储。     

滴灌条件下毒死蜱在土层中迁移转化规律及其对土壤微生物特性的影响

为了解滴灌条件下毒死蜱在土壤中的迁移转化规律,采用土柱模拟试验,研究了滴灌条件下种植作物、代森锌消毒和不同土壤含水率对毒死蜱的分布及土壤酶活性和土壤微生物生物量碳的影响。结果表明：施用于表层的毒死蜱在施用初期主要残留在10 cm以上土层,随着时间的增加,而发生降解并向下迁移。土壤中3,5,6-三氯-2-吡啶酚（TCP,毒死蜱的主要代谢产物）含量在0.1~1.5 mg·kg^-1之间,施药30 d后,40 cm土层中毒死蜱和TCP均有检出。不同处理下,毒死蜱含量在10 cm以上土层存在较大差异,TCP含量在20 cm以上土层存在一定差异。消毒抑制毒死蜱的降解,作物根系促进土壤微生物繁殖,有利于毒死蜱的降解。土壤含水率对10 cm土层毒死蜱含量有较大影响,在未消毒和种植作物处理中,最强的毒死蜱降解分别发生在土壤含水率为80%和70%处理中。毒死蜱和TCP对微生物以抑制作用为主,不同处理的抑制程度不同。毒死蜱在低浓度时对过氧化氢酶和脲酶活性有激活作用,高浓度时存在抑制作用,作物的存在减弱了毒死蜱对两种酶活性的影响。毒死蜱的降解与土壤碱性磷酸酶活性有关,种植作物改变了毒死蜱和土壤碱性磷酸酶的分布。代森锌消毒对过氧化氢酶和脲酶活性有激活作用,对碱性磷酸酶活性有一定抑制作用。