基于WSN的油菜生长环境数据采集系统     

李建辉  廖桂平  王访 《湖南农业大学学报(自然科学版)》2013,39(6):675-682

针对传统作物生长环境数据获取手段实时性差、劳动强度大以及部署微型自动气象站和商用Zigbee产品成本高、开放性较差等问题，设计并实现了一种基于WSN的油菜生长环境数据采集系统。提出了轻量级的能量感知路由协议CLFP，并给出了软硬件的相关设计方法。仿真和大田试验结果表明，系统温度采集精度最高可达0.01 ℃，测湿精度达±5%，光强采集范围为1~65 535 lx，可并发的数据传输达到36路，可满足农业现场环境数据的较高测量要求。在标称电源供电情况下，系统实际有效生存周期超过142 d，由于采用AT89C51和nRF2401作为基础硬件平台，成本低廉，有助于大规模部署和应用。  相似文献   

生产力促进中心咨询诊断服务的SWOT分析     

薛强  赵静 《湖南农业大学学报(自然科学版)》2013,(4):69-74

生产力促进中心自建设发展以来，形成了多样化的服务业务。其中，咨询诊断服务不断衍化发展，已经成为服务中小企业的重要手段，积累了一定的优势，也存在着劣势。面对科技服务业迅猛发展的态势，生产力促进中心开展咨询诊断服务面临机遇与挑战并存的局面，通过基于SWOT分析法构建的评价模型，明确主要影响因素，进而推演出下一步发展的具体路径。  相似文献   

提升犊牛日增重的方法研究     

吴赫云  解玲娜  郑玺 《中国乳业》2021,(8):52-55

犊牛阶段的生长状况对牛只的生产性能具有重要影响,为提高牧场效益,牧场越来越追求犊牛阶段生长的最大化。通过饲喂代乳粉达到犊牛断奶前1.0 kg日增重,对牛只生产性能的提升具有重要意义。本文主要介绍增加犊牛日增重对牛只生产性能的积极影响,同时根据荷兰Schils的试验对代乳粉的选择和饲喂流程提出建议,以期对牧场合理使用代乳粉,实现犊牛阶段生长最大化提供参考。  相似文献   

家庭猪场防控非洲猪瘟的关键点分析     

刘涛 《猪业科学》2021,38(10):38-41

非洲猪瘟对家庭猪场的生产稳定性带来极大的挑战。文章分析了家庭猪场防控非洲猪瘟存在的问题及对关键点针对性的防控措施。  相似文献   

Soil aggregate formation and stability induced by starch and cellulose     

《Soil biology & biochemistry》2015

Soil aggregate (SA) can be formed and stabilized when soil organic matter (SOM) is decomposed in the soil. However, the relationships between the SA dynamics and SOM with different decomposition rates have not been clarified. Therefore, this study examined the effects of the addition of polysaccharides to soil on SA formation and stability. A Japanese tropical soil was incubated for 99 d at 30 °C in a dark environment following the addition of 0.5% (w/w) starch or cellulose. The decomposition rates of the amendments, and SA formation and stability were evaluated by measuring soil respiration rates, and distribution fractions of soil aggregate sizes and mean weight diameter (MWD) of SA, respectively. The cumulative soil respirations with all treatments rapidly increased until Day 12 of the incubation. The initial slope of the cumulative soil respiration in the soil with starch was significantly higher than that in the soil with cellulose. In either soil with starch or cellulose, the fractions of macro-aggregates (>1000 μm in diameter) significantly increased, respectively, compared with control soil. However, the fractions of meso-aggregates (250–1000 μm) and nano-aggregate (<20 μm) in the soil with starch significantly decreased, while those fractions in the soil with cellulose fluctuated until Day 6. The MWDs reached the maximum on Day 6, indicating the SA formation in the soils with starch or cellulose. The increasing rate of the SA formation in the starch-amended soil was greatly higher than that in the cellulose-amended soil. After Day 6, the MWDs in the soils with either polysaccharide decreased with similar trends with no significant differences between treatments, indicating similar stability of the SA in both treatments. This study showed that the different decomposability of the organic amendments might influence the SA formation differently, but not the SA stability.  相似文献   

Environmental heat and airborne pollen concentration are associated with increased asthma severity in horses          下载免费PDF全文

M. Bullone  R. Y. Murcia  J‐P. Lavoie 《Equine veterinary journal》2016,48(4):479-484

  相似文献   

四种替代药剂对梨火疫病菌的抑制活性及其田间防效     

李东旭  于松涛  张亚杰  林彩霞  李令蕊  王树桐 《植物保护学报》2023,50(5):1368-1376

为筛选农用链霉素替代药剂,以其为对照药剂,测定春雷霉素、中生菌素、噻霉酮和噻菌铜这4种常用细菌病害防治药剂对梨火疫病菌Erwinia amylovora的抑制活性、对梨火疫病的田间防效及不同药剂处理后梨中的农药残留,并对这4种药剂的作物安全性进行评价。结果表明,中生菌素、噻霉酮和春雷霉素对梨火疫病菌有抑制作用,抑制中浓度EC50分别为1.60、6.64和60.57 mg/L,中生菌素的抑制效果高于链霉素。在连续2年田间试验中,中生菌素1 000倍液和春雷霉素400倍液对梨火疫病的保护效果和治疗效果均达90.33%以上,噻霉酮500倍液和噻菌铜200倍液对梨火疫病的保护效果均达100.00%,治疗效果均超过86.97%,与对照药剂农用链霉素2 000倍液的效果相当。所有药剂处理后均未检出中生菌素、春雷霉素、高效氯氰菊酯和农用链霉素的农药残留,而噻虫嗪、阿维菌素和矮壮素虽有检出,但其残留量均低于国家限量标准。花期前后、幼果期和果实膨大期施药,中生菌素、春雷霉素、噻霉酮和噻菌铜对梨花、叶片、枝梢及果实生长均无不良影响。综合来看,中生菌素、春雷霉素、噻霉酮和噻菌铜均可作为农用链霉素的替代药剂,...  相似文献   

国内外致泻大肠埃希氏菌O157:H7的检测标准比较及建议     

孟静  钟立霞  郭颖慧  程祥龙  伊廷存  霍胜楠 《中国乳业》2023,(4):76-81

致泻大肠埃希氏菌O157:H7（STEC O157:H7）是大肠埃希氏菌中致病性最严重的一种食源性致病菌,主要存在于牛肉、牛奶、水果及其制品中,对身体健康造成很大危害,甚至引发死亡。食品中STEC O157:H7检测尤为重要。本文对国内外STEC O157:H7的检测标准进行比较,提出我国标准在样品前处理、快速筛选方法的应用等方面需要加强,以便为该菌快速准确检测提供帮助,实现与国际标准化体系建设接轨,满足实验室检测需要。  相似文献   

Antioxidant,anti-amylase and anti-glycation potential of brans of some Sri Lankan traditional and improved rice (Oryza sativa L.) varieties     

《Journal of Cereal Science》2014,59(3):451-456

Brans of 23 traditional and 12 improved (both red and white) rice varieties in Sri Lanka were screened for anti-amylase and anti-glycation activities in vitro. Varieties which showed the highest inhibitory activities at screening were further investigated for anti-glucosidase and glycation reversing as anti-diabetic properties. The same varieties were studied for selected antioxidant properties. Significantly high anti-amylase and anti-glycation activities were observed for bran extracts of red varieties compared to white varieties at screening. Traditional red rice varieties, Masuran, Sudu Heeneti, Dik Wee and Goda Heeneti, exhibited significant and dose dependent anti-amylase, anti-glycation and glycation reversing activities. These varieties also showed marked antioxidant properties. It is concluded that brans of Sri Lankan traditional red rice varieties Masuran, Sudu Heeneti, Dik Wee and Goda Heeneti may be potential food supplements for diabetes.  相似文献   

Unique Property Continuation and Compact Imbodding and Nonlinear Elliptic Equations     

He Chuanjiang 《保鲜与加工》1996,(1):136-138

  相似文献