ZigBee在精确林业中的应用

重点研究了ZigBee技术在精确林业中的应用,提出了一种基于ZigBee技术和GPRS技术的林业信息监控系统的实现方法.同时,给出了以TI公司的CC2430芯片为核心的系统设计方案,以及相应的系统硬件结构和软件的流程.该系统将无线传感器网络技术应用到林业中,具有低成本、低功耗、智能化、易维护、保护生态环境等特点,具有很好的实用性.     

便携式土壤水分测试仪的设计与实现

介绍了一种基于CC2530的便携式土壤水分测试仪的设计与实现。该系统由CC2530小系统、FDS100水分传感器及GPS定位模块等组成,可完成土壤水分、测试地点经纬度、海拔等参数的采集和存储,用户可通过串口将所存数据转到计算机进行分析和处理。     

基于ZigBeeCC2430的土壤含水率监测系统设计

针对农田土壤环境参数大滞后及大惯性的特点,基于低功耗ZigBee CC2430无线通信技术,设计了土壤含水率监测系统。通过运用无线传感器智能信息处理技术及数据通信技术,使得监测系统的自动化与监测水平得到提升。该系统采用星型拓扑结构组网,通过在监测区域部署网络节点,将监测数据汇集到监测中心,实现统一的数据管理和Zigbee网络的路由监测功能。给出了系统硬件和软件实现方法,包括无线传感器节点设计、数据采集、传输及通信等模块的实现原理。遵循模块化设计思想,传感器和功能模块可组合配置,通用性强。对于农田土壤含水率的监测实验结果表明,该系统性能稳定,能够实现数据采集、传输及显示,可广泛应用于各领域的环境参数自动监测。     

基于RFID与WSN的现代化奶牛养殖系统研究

为了提高奶牛养殖的现代化水平,将RFID和WSN技术相融合,充分发挥两者各自的优势,构建适用于大规模奶牛养殖的现代化管理系统。利用RFID技术实现牲畜个体识别与追踪,WSN技术实现奶牛健康状况、养殖场环境的实时监测,为奶牛养殖的现代化管理、疾病防治和食品安全等提出了综合的解决办法。试验表明,该系统具有稳定、方便、布置灵活、成本低等特点,具有良好的应用前景。     

An application of digital imagery analysis to understand the effect of N application on light interception,radiation use efficiency,and grain yield of maize under various agro-environments in Northern Mozambique

Light-based analysis is a fundamental approach to quantify the effects of factors determining crop growth in a given environment. The objectives of this study are to confirm the applicability of a digital imagery technique to extract green leaf areas for estimating light interception (LI) of maize canopy and to understand the effect of fertilizer application on the LI and radiation use efficiency (RUE) of maize under various agro-environments in Northern Mozambique. A locally recommended variety, Matuba, was grown in a single season with three different N application rates (0, 30, and 80 kgN ha^?1) at one hot/dry low-elevation site, two hot/humid mid-elevation sites, and one cool/humid high-elevation site. Repeated measurements with quantum sensors revealed that the digital imagery is applicable to estimate the LI of maize except for leaf-senescing period close to maturity. The N application demonstrated profitable yield increases with agronomic nitrogen use efficiencies (kg grain yield per kg N input) of 20.6–35.3 kg kg^?1 except for the low-elevation site with severe drought stress. In the mid-elevation sites, the yield increases were mostly explained by the improvement of RUE while the effect on LI was small because the vegetative growth was naturally vigorous under high temperatures irrespective of N inputs. At the high-elevation site, the N application improved its stagnant initial canopy development and increased both RUE and LI. The simple and inexpensive imagery technique should be useful to identify physiological basis of maize responses to fertilizer application and its interaction with regional environment even under poorly equipped regions in the tropics.     

基于CC1100的温室温湿度监测系统

针对传统温室温湿度监测系统的弊端,介绍了一种基于CC1100的温室温湿度监测系统的设计方案.系统采用数字式温湿度传感器SHT10进行数据采集,利用无线传输芯片CC1100实现数据短距离无线收发,满足温室温湿度监测的实时性和可靠性要求.实验证明,温室温湿度监测系统成本低,功耗低,体积小,传输可靠,具有很好的应用前景.     

玉米个体发育进程中控制叶片生长的基因效应差异性初探

通过对玉米各主要生育时期叶片性状的基因效应及配合力方差分析结果表明;玉米个体发育不同时期的叶片性状(单株出叶数、绿叶面积,出叶速率、叶面积增长速率)所受的基因主导效应是有较大差异的。因此,如果我们沿用以往的研究方法,以终结产物来推源(估算、推论)供试性状的基因型或基因效应,显然只能表示该性状终结阶段的状况,在此前后作用于该性状的基因效应不可能尽相一致的。     

鸭肥肝性能的品种差异与杂交效应

本试验研究了狄高鸭、北京鸭、建昌鸭、四川麻鸭以及狄建[狄高(♂♂)×建昌(♀♀)]、狄川[狄高(♂♂)×四川麻鸭(♀♀)]、京川[北京鸭(♂♂)×四川麻鸭(♀♀)]和建川[建昌(♂♂)×四川麻鸭(♀♀)]杂交鸭的肥肝生产性能。结果表明:(1)狄建鸭具有优异的肥肝生产性能,填饲十五日后的肥肝,平均重达269.8克。北京鸭、狄川、狄高、建昌鸭、建川、京川和四川麻鸭则分别为236.6克、230.4克、229.4克、223.4克、217.5克、217.4克、188.4克。(2)肥肝重的杂交优势现象普遍存在。     

Gender differences in the rat corpus callosum: An ultrastructure study

Sexual dimorphism exists at all levels of the nervous system, from genetic, anatomical and system levels. The sexual dimorphism in the axonal content of the corpus callosum (CC) has always been controversial; hence, the aim of this study was to analyse the differences in total, myelinated and unmyelinated axons density of various regions of the CC between male and female rats. To assess that, six pairs of adult male and female rats were perfused and the CC was removed and sectioned. Four sections from different subregions of the corpus callosum that represent the genu, anterior body, posterior body, and splenium, were stained, and electron microscopic images were captured using stereological guidelines. Later, the axons density for each subregion was calculated and compared between males and females. The findings of the present study indicated region‐specific differences in the myelinated, unmyelinated or the ratio of myelinated/total axons in the CC between male and female rats.     

肿瘤转移抑制基因Tip30/CC3研究进展

Tip30/CC3是新发现的一种与肿瘤转移抑制相关的基因,在人类的多种组织如心、脑、肺、肾、骨骼肌和胰腺中均有表达,但在多种肿瘤组织中表达下降或缺失.研究表明,一方面,Tip30/CC3是一种转录辅助因子,具有丝/苏氨酸激酶活性,可以和RNA聚合酶Ⅱ最大亚基结合并磷酸化其C末端的七肽重复基序,在特定生理病理环境下调节细胞凋亡和血管生成相关基因的表达,从而促进细胞凋亡和抑制肿瘤转移;另一方面,Tip30/CC3能够以RanGTP非依赖形式直接与Importin β家族成员及核孔蛋白相结合,抑制核转运蛋白的功能,通过抑制核物质输入促进细胞凋亡来发挥抑癌作用.文章就Tip30/CC3基因的发现、结构特点、与肿瘤的关系、功能、作用机理和应用前景进行了综述.