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采用单个性信息素腺体的分析技术,研究了枣粘虫(AncylissatovaLiu)第一代雌成虫性信息素组分的精确比例。研究结果表明:枣粘虫的性信息素由4个组分组成,即E9-C12:0AC(Ⅰ)、Z9-C12:OAC(Ⅱ),7,-C12:OAC(Ⅲ)和Z7-C12:OAC(Ⅳ),各组分精确比例为Ⅰ:Ⅱ:Ⅲ:Ⅳ=52:35:6:7;E9/Z9的比例为60.9±7.8%E,E9/Z9比例的变异系数C.V=10.3%。定量研究结果表明,单雌性信息素腺体的含量平均为5.8±3.3ng,各组分的含量分别为3.02(Ⅰ),2.03(Ⅱ),0.35(Ⅲ),0.40ng(Ⅳ)。 相似文献
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辛基苯基聚氧乙烯醚硫酸钠C8H17C6H4(OC2H4)10SO4Na(C8ψE10S)和十二烷基7聚氧乙烯醚硫酸钠C12H25(OC2H4)7SO4Na(C12E7S)与溴化十二烷基三甲烷C12H25N(CH3)3Br(C12NM3)不仅能在水溶液中形成透明的均匀溶液,而且混合体系的临界胶团浓度和γcnc比单一组分的低,C12E7S-C12NM3和C8ψE10SC12NM3对极性物的加溶,随混合 相似文献
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提出了用以判别梁的有限变形精确理论与近似理论的3条准则,在李明瑞的2维染有限变形精确理论的基础上,推导出几种合理的简化理论,将Reissner-Simo理论补充成为完整的近似理论,通过算例对各理论作了比较。 相似文献
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水稻栽培技术对水稻高产的影响 总被引:1,自引:0,他引:1
《农技服务》2017,(6):22-23
当前农业生产体系中高水平农业技术众多,其对农作物的产量影响也相当可观。我国作为水稻种植大国,在水稻高产栽培技术方面研究相对深入,本文主要研究了水稻精确定量栽培技术,通过试验材料与方法阐述、结果与分析详细论述了精确定量栽培技术对水稻栽培的各方面具体影响。 相似文献
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水稻精确定量栽培技术指根据水稻的生长规律和本地区的自然条件,通过采用新型培育技术,以较低的成本投入获取较高的种植收益,真正实现水稻种植的高产、优质、绿色、安全。近年来,水稻精确定量栽培技术在多地试点种植中取得了良好成绩,通过开展精确定量栽培技术研究,可以为实现该项技术的进一步推广和应用提供支持,为实现水稻增产、农民增收提供保障。 相似文献
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辛基苯基聚氧乙烯醚硫酸钠C_8H_(17)C_6H_4(OC_2H_4)_(10)SO_4Na(C_8E_(10)S)和十二烷基7聚氧乙烯基醚硫酸钠C_(12)H_(25)(OC_2H_4)_7SO_4Na(C_(12)E_7S)与溴化十二烷基三甲铵C_12H_(25)N(CH_3)3Bk(C_(12)NM3)不仅能在水溶液中形成透明的均匀溶液,而且混合体系的临界胶团浓度(cmc)和γ_(cmc)比单一组份的低。在C_8E_(10)S中引入C_(12)NM_3的量小于10%时,C_8E_(10)S—C_12NM_3的润湿能力不变;大于10%时,润湿能力增加;超过20%时,润湿能力下降。润湿力随浓度的增加而增加,在约1.3mM时,出现1个转折点。混合比改变时,C_8E_(10)S—C_(12)NM_3对煤油的乳化能力出现两个极大值1个极小值。乳化力随浓度的增力。而增加,在浓度为0.55mM时,体系的乳化明显增加而出现1个转折点。 相似文献
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表面活性剂类型对超氧化物歧化酶活力的影响研究 总被引:1,自引:0,他引:1
本文研究了阴离子C12H25SO4Na(C12S),C12H25(OC2H4)7SO4Na(C12E7S),阳离子C12H25NC(CH3)3·Br(C12NMe3)和非离子C8H17C6H4(OC2H4)10OH(Tx-100)表面活性剂对超氧化物歧化酶(SOD)活力的影响以及变性后的复性。结果表明,C12E7S和Tx-100对SOD的活力几乎无破坏,C12S对SOD只具有一定的破坏性,C12NMe3对SOD具有较强的变性能力 相似文献
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辛基苯基聚氧乙烯醚硫酸钠C_8H_(17)C_6H_4(OC_2H_4)_(l0)SO_4Na(C_8E_(10)S)和十二烷基7聚氧乙烯基醚硫酸钠C_(12)H_(25)(OC_2H_4)_7SO_4Na(C_(12)E_7S)与溴化十二烷基三甲铵C_(12)H_(25)(CH_3)_3Br(C_(12)NM_3),不仅能在水溶液中形成透明的均匀溶液,而且混合体系的临界胶团浓度和γcmc比单一组分的低。C_(12)E_7S-C_(12)NM_3和C_8E_(10)S-C_(12)NM_3对极性物的加溶,随混合比的变化呈“V”型,而对非极性物的加溶呈“”型。混合比改变时,C_(12)E_7S-C_(12)NM_3和C_8E_(10)S-C_(12)NM_3溶液的粘度出现1个极大值(在1:1附近)。在C_8E_(10)S中引入C_(12)NM_3的量小于10%时,C_8E_(10)S-C_(12)NM_3的润湿能力不变;大于10%时,润湿能力增加,超过20%时,润湿能力下降。混合比改变时,C_8E_(10)S-C_(12)NM_3对煤油的乳化能力出现两个极大值和1个极小值。 相似文献
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On-farm implementation of the concept of precision livestock farming requires the design and development of new, advanced and often complex equipment. This article proposes an agent-based simulation framework to meet the challenges of designing, testing and evaluating the performance of the new, automated precision feeding equipment for farms. In this context, an agent is a piece of software performing defined system functions such as exchanging information or requesting services to other agents via a high-level agent communication language. The proposed approach sees each main component of the actual precision feeding system represented by a virtual domain agent. The agents are then assembled within a multi-agent system that models the automatic precision feeding equipment as a whole. The operational capacity of the virtual prototype is achieved through communication and collaboration between the multiple agents that make up the system. The capacity for dynamic modification of parameters such as workload during the simulation process helps analyze the behavior, robustness and performance of the system prior to its actual use and thus providing a computer-aid tool helping in the design process. One case study shows that agent-based composable simulation can predict the behavior and performance of the system as a whole. 相似文献
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本文根据上海地区农业发展的实际情况,提出了上海地区发展精准农业的三种模式,即以规模经营为主体的精准变量管理发展模式、以分散农户为主的精准分区管理发展模式和以设施栽培为主的自动化管理发展模式。同时针对不同的管理模式,分别提出了相应的土壤养分精准管理模型。 相似文献
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物联网在奶牛养殖中的应用及展望 总被引:2,自引:0,他引:2
物联网在奶牛养殖中的应用,不仅能有效优化奶牛养殖管理模式,而且为奶牛的精细化养殖提供有力手段,为提高奶牛年产奶量以及整个奶牛养殖产业的持续发展提供动力。目前,物联网技术在奶牛养殖方面的应用主要集中在奶牛场生产环境监测、奶牛生理监测、奶牛精细饲喂、溯源信息采集4个方面,为奶牛的科学管理提供数据支持。展望未来,随着科技的不断进步,相关研究不断推进,物联网技术将会应用到奶牛养殖的各个环节,基于物联网的科学饲喂、实时监测以及智能管理将是未来奶牛养殖产业的发展方向,它将进一步提高奶牛的产量和质量,提升奶牛养殖的现代化水平。 相似文献
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精准农业研究的回顾与展望 总被引:11,自引:1,他引:11
本文综述了国际上精准农业的研究概况,包括精准农业理念的形成、技术体系的发展、研究动态及在有关国家的应用情况等;总结了我国精准农业研究的现状和存在的问题,针对我国的具体情况,对于在规模经营和分散经营条件下如何应用信息等高新技术开展精准农业技术研究进行了探讨。 相似文献
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Cláudia B. Silva Sônia Maria Leite Ribeiro do Vale Francisco A. C. Pinto Carlos A. S. Müller Altair D. Moura 《Precision Agriculture》2007,8(6):255-265
The objective of this study was to carry out a comparative analysis of the costs and economic profitability and viability indicators involved in implementing precision and conventional farming practices using maize and soybean crops in the state of Mato Grosso do Sul, Brazil. After identifying the production costs, analyses of the profitability indicators and viability indicators were carried out. The calculated profitability indicators (gross revenue, gross margin, break-even point, operational profit, and profitability index) presented better economic results under the precision system. For the analysis of the viability indicators, the net present value method and the internal rate of return method were used to analyze the two production systems, showing smaller investment attractiveness for the conventional farming system than for the precision system, though with a small difference in values. The Monte Carlo method was applied to evaluate investment risk. The selection of the variables to be simulated was based on the sensitivity analysis results, such as production, sale price and input price. The results obtained through simulation led to the conclusion that the risks are low for the two production systems analyzed. 相似文献
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Emanuel PeresAuthor Vitae Miguel A. FernandesAuthor VitaeRaul MoraisAuthor Vitae Carlos R. CunhaAuthor Vitae Juan A. LópezAuthor VitaeSamuel R. MatosAuthor Vitae P.J.S.G. FerreiraAuthor VitaeM.J.C.S. ReisAuthor Vitae 《Computers and Electronics in Agriculture》2011,78(2):176-187
Wireless sensor networks have found multiple applications in precision viticulture. Despite the steady progress in sensing devices and wireless technologies, some of the crucial items needed to improve the usability and scalability of the networks, such as gateway infrastructures and in-field processing, have been comparatively neglected. This paper describes the hardware, communication capabilities and software architecture of an intelligent autonomous gateway, designed to provide the necessary middleware between locally deployed sensor networks and a remote location within the whole-farm concept. This solar-powered infrastructure, denoted by iPAGAT (Intelligent Precision Agriculture Gateway), runs an aggregation engine that fills a local database with environmental data gathered by a locally deployed ZigBee wireless sensor network. Aggregated data are then retrieved by external queries over the built-in data integration system. In addition, embedded communication capabilities, including Bluetooth, IEEE 802.11 and GPRS, allow local and remote users to access both gateway and remote data, as well as the Internet, and run site-specific management tools using authenticated smartphones. Field experiments provide convincing evidence that iPAGAT represents an important step forward in the development of distributed service-oriented information systems for precision viticulture applications. 相似文献
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基于3S技术的精准农业 总被引:6,自引:0,他引:6
简述了精准农业概念的形成及基本含义,重点讲述了精准农业的主要支持技术“3S”技术以及系统集成技术在我国的应用,并分析了我国精准农业的发展趋势,提出几点看法。 相似文献