基于Netty的农业物联网服务器系统设计

为了方便对温室环境的监控和控制,使用Netty网络框架设计了一个农业物联网服务器系统,能够简化物联网服务器端的开发,实现下位机与上位机的实时通信。本文阐述了该系统的工作原理和总体设计,以期为实现大棚农作物生长的智能化和信息化管理。     

Influence of soil phosphorus status,texture, pH and metal content on the efficacy of amendments to pig slurry in reducing phosphorus losses

Cost‐effective strategies for using chemically amended organic fertilizers need to be developed to minimize nutrient losses in surface and groundwater. Coupling specific soil physical and chemical characteristics with amendment type could increase their effectiveness. This study investigated how water‐extractable phosphorus (P) was affected by chemical amendments added to pig slurry and how this effect varied with soil properties. A 3‐month incubation study was conducted on 18 different mineral soils, stored at 10 °C and 75% humidity and treated with unamended and amended slurry which was incorporated at a rate equivalent to 19 kg total P (TP )/ha. The amendments examined were commercial‐grade liquid alum, applied at a rate of 0.88:1 [Al:TP ], and commercial‐grade liquid poly‐aluminium chloride (PAC ), applied at a rate of 0.72:1 [Al:TP ]. These amendments were previously identified by the authors as being effective in reducing incidental losses of P. The efficacy of the amendments varied with the soil test P, the degree of P saturation (DPS ) and the Mehlich aluminium, iron and calcium, but not soil texture. Chemical amendments were most effective in soils with DPS over approximately 20%. Due to their high cost, the incorporation of amendments into existing management practices can only be justified as part of a holistic management plan where soils have high DPS .     

微量元素Se缺乏或过量对雏鸡组织Se含量影响的研究

选用１０２６只１周龄罗斯蛋用雏鸡为试验动物，研究不同日粮Ｓｅ水平对雏鸡组织Ｓｅ含量的影响。结果表明雏鸡的Ｓｅ缺乏或过量均可通过各组织Ｓｅ含量的变化反映出来，但反映的敏感性及临界指示值因组织及发育期不同而异。日粮Ｓｅ水平缺乏或过量时，各组织Ｓｅ含量相应降低或增加。在本试验条件下得出罗斯蛋用雏鸡的Ｓｅ需要量范围为０．１４５×１０￣（－６）～０．４９５×１０￣（－６），其中以０．１９５×１０￣（－６）最佳；日粮Ｓｅ含量≤０．０９５×１０￣（－６）或≥０．９９５×１０￣（－６），雏鸡出现Ｓｅ缺乏症或中毒症。     

加速广义Laguerre多项式级数的Laplace变换的数值反演方法

本文利用Levin t-变换迭代法，对加速广义Laguerre多项式级数，提出了一种新的Laplace变换的数值反演方法，这种方法在精度上和数值稳定性上的效果都较好。     

辛亥革命前后张謇与袁世凯的交往

张謇与袁世凯的交往长达三十余年,他从最初的相识荐袁、拥袁合作、相互借重到后来的分离,张謇曾幻想依靠袁世凯实现自己“实业救国”的抱负,却以失败而告终。二人分分合合,充满波折的交往过程反映了中国近代资本主义发展的艰难与坎坷。     

Direct and Residual Contributions of Symbiotic Nitrogen Fixation by Legumes to the Yield and Nitrogen Uptake of Maize (Zea mays L.) in the Nigerian Savannah

Field experiments were conducted to determine the direct and residual contributions of legumes to the yield and nitrogen (N) uptake of maize during the wet seasons of 1994 and 1995 at the University Farm, Abubakar Tafawa Balewa University, Bauchi, Nigeria, located in the Northern Guinea savannah of Nigeria. Nodulating soybean, lablab, green gram and black gram contributed to the yield and N uptake of maize either intercropped with the legumes or grown after legumes as a sole crop. Direct transfer of N from the nodulating soybean, lablab, green gram and black gram to the intercropped maize was 24.9–28.1, 23.8–29.2, 19.7–22.1 and 18.4–18.6 kg N ha^–1, respectively. However, the transfer of residual N from these legumes to the succeeding maize crop was 18.4–20.0, 19.5–29.9, 12.0–13.7 and 9.3–10.3 kg N ha^–1, respectively. Four years of continuous lablab cropping resulted in yields and N uptake of the succeeding maize crop grown without fertilizer N that were comparable to the yields and N uptake of the succeeding maize crop supplied with 40–45 kg N ha^–1 and grown after 4 years of continuous sorghum cropping. It may therefore be concluded that nodulating soybean, lablab, green gram and black gram may be either intercropped or grown in rotation with cereals in order to economize the use of fertilizer N for maize production in the Nigerian savannah.     

高校公寓文化建设的几点思考

从校园文化、学风建设、素质教育、思想教育等方面，阐述公寓文化的作用和意义，提出理顺管理机制、发挥学生主体作用、加强制度建设，开展公寓文化活动等几点建议。     

《中国草地学报》2006-2008年载文及作者统计分析

通过对2006-2008年出版的《中国草地学报》载文及作者情况进行统计分析，研究其栽文和作者一些规律和特点。     

开拓创新锐意进取办好省级农业科技期刊——《广西农业科学》办刊实践

为了适应农业科研和生产发展的需要，《广西农业科学》编辑部在近年的办刊实践中积极探索，开拓创新，通过调整刊物定位向学术性期刊转变，增加版面和改进编辑流程缩短文章出版时滞，拓宽报道范围扩大影响力，加强与同行的交流学习，提升办刊理念，实行文稿校核质量控制体系，保证刊物质量，强化编辑队伍建设提高编辑人员业务素质，加强期刊经营增强期刊社经济实力等措施，使期刊的内外质量不断提高，社会效益和经济效益显著增强，期刊进入良性发展阶段。