河岸渗滤系统除污功效的研究进展

河岸渗滤系统对污水具有净化功能.介绍了河岸渗滤系统的除污功效,为实现城市污水资源化提供依据.     

植物无糖组培快繁装置及其环境控制系统的研制

针对常规植物组培存在的问题,从植物无糖组培实用化角度出发,研制了带有新型CO2施放装置的180 L植物无糖组培容器及其环境控制系统,采用小流量控制、三通阀调节和PWM控制方式,实现了对CO2浓度的精确控制,控制精度达到±50 μmol·mol^-1;采用穴盘覆膜与气体循环吸附相结合的方式实现了对容器内相对湿度的自动控制,控制精度达到±22%.通过圆叶海棠的无糖组培的试验,结果表明,该系统对组培苗的生长环境和生理品质的提高具有显著的促进作用.     

新农村建设中农民居住环境问题的研究(Ⅺ)——小城镇绿地系统建设分析

论述了城镇绿地系统建立的理论依据及其对自然、社会的作用,指出了现行规划中存在的一些问题,并提出了有效的解决办法。     

构建中国征地移民监测体系的设想

分析了中国构建征地移民监测体系的背景,结合世界银行已有经验和中国征地制度实际情况,提出了建设中国征地移民监测体系的设想,分析了征地移民监测体系的运作模式、监测内容、监测指标、面临的困难等关键环节,从总体上描述了中国征地移民监测体系的框架。     

公钥密码算法及特点

随着计算机网络的发展，信息安全要求的日益提高，公钥密码算法体现出了秘密密码算法不可替代的优越性。本文详细介绍了公钥密码体制常用的算法及其所支持的服务，并就公钥密码新的研究方向进行了展望。     

加强实践教学构建农村区域发展专业能力教育体系

通过总结近年的研究成果，分析了农村区域发展专业学生能力培养过程中存在的问题，建立了农村区域发展专业能力教育体系，并提出了通过强化实践教学环节培养学生能力的具体措施。     

可信计算系统（TCG）

本文叙述了可信计算系统的概念并提出对可信计算系统的不足和改进     

剑麻纤维接枝丙烯酸吸水树脂的研究

以剑麻纤维为骨架,以一定中和度的丙烯酸和少量丙烯酰胺为单体,采用硫代硫酸钠(Na2S2O3)和过硫酸盐为引发体系,通过接枝反应制备纤维素基吸水树脂.考察引发体系及条件对制备吸水树脂的影响,探索单体配比、交联剂浓度对吸水树脂的吸水能力、吸水速率、保水性能和反复吸水性能的影响.结果表明:在硫代硫酸钠和过硫酸盐组成氧化还原引发体系中,采用过硫酸钾和过硫酸铵两种氧化剂组成的引发体系,在引发剑麻纤维接枝丙烯酸单体的反应中起到协同效应;有效地将过硫酸盐引发接枝反应的温度由常用的55～80℃降至30～50℃,同时,达到较高的接枝率和单体转化率.交联剂的用量、丙烯酰胺(AM)的用量和丙烯酸(AA)的用量对吸水倍率和吸盐水倍率有显著的影响.吸水树脂的最大吸水倍率为530 g/g,最大吸盐水倍率为58 g/g,吸水速率为8 g(g·min),树脂具有良好的保水性和热稳定性.FTIR分析结果表明,吸水树脂是纤维素和丙烯酸的接枝共聚物.TGA分析结果表明,吸水树脂比剑麻纤维热稳定性好.     

Mutualism between euryhaline tilapia Sarotherodon melanotheron heudelotii and Chlorella sp.—Implications for nano-algal production in warmwater phytoplankton-based recirculating systems

The West-African euryhaline tilapia, Sarotherodon melanotheron heudelotii shift from visually feeding on zooplankton when juveniles to mostly filter feeding on phytoplankton when adults. When reared using an appropriate ration in intensive aquaculture systems, S. m. heudelotii also consume algal-based detritus, and contribute to sediment mineralization, clean up their environment, and ultimately stimulate and sustain algal growth. We analysed such practical advantages for phytoplankton-based recirculating systems, using S. m. heudelotii and Chlorella sp. as biological material originating from the prototype of such a system operated in Senegal. We performed a 24-h factorial design experiment in 36 tubs, cross-classifying three levels of S. m. heudelotii (fishless control, unfed fish, and fed fish) with four levels of Chlorella initial density.Chlorella overall mean density increased significantly from fishless, to unfed fish, and fed fish treatments, and with Chlorella initial density. S. m. heudelotii did not alter nitrogen nor phosphorus concentrations, only affected by algal initial densities. Most ammonia excreted by fish was probably uptaken by Chlorella. Bacteria-mediated diurnal nitrification was possibly an alternative ammonium loss mechanism at highest oxygen concentrations. Algae were not limited by nitrogen or phosphorus but most likely by low dissolved organic carbon availability. Chlorella differential responses with fed vs. unfed Sarotherodon suggest that CO₂ supplied by heterotrophic S. m. heudelotii respiration played a key role. Observed Chlorella growth rates were similar to the highest rates obtained in algal mass cultures, enriched with CO₂, nitrate and phosphate, under artificial lighting.Our results suggest the existence of a Sarotherodon-Chlorella mutualism in our systems, where S. m. heudelotii provide CO₂, the major limiting factor of Chlorella growth, whereas Chlorella oxygenate and detoxify the water media from ammonia, promoting S. m. heudelotii production. This mutualism could be used to optimize photosynthetic suspended-growth aquaculture systems, particularly in the Tropics where light is abundant and temperature is continuously high.     

春作——两系法杂交水稻早秋制——秋菜栽培模式初探

阐述了“春作——培两优特青早秋制——秋菜”栽培模式的科学依据和优点，并具体提出了几种主要的搭配模式，探讨了每种模式的适应范围、品种搭配、栽培管理技术，强调了培两优特青早秋制要培育双强亲本、灵活调节花期和综合防治稻粒黑粉病等几个技术环节。