The process of developing a nutrition-sensitive agriculture intervention: a multi-site experience

Nutrition-sensitive agriculture (NSA) interventions are of increasing interest to those working in global health and nutrition. However NSA is a broad concept, and there are numerous candidate NSA interventions that could be implemented in any given setting. While most agriculture interventions can be made “nutrition-sensitive”, there are few guidelines for helping to decide what agriculture component should be tried in an NSA intervention. Based on previous models, we developed a framework with explicit questions about community factors (agricultural production, diets, power and gender), project factors (team capacity, budget, timelines) and external factors that helped our team of agriculture scientists, nutritionists and local officials identify NSA interventions that may be feasibly implemented with a reasonable chance of having positive agricultural and nutritional impacts. We applied this framework to two settings in upland Vietnam, and one setting in upland Thailand. From an initial list of nineteen interventions that have been tried elsewhere, or may reasonably be expected to be appropriate for NSA, five or six candidate interventions were chosen per site. Based on the criteria, three to four interventions were selected per site and are being implemented. Poultry rearing and home gardening were selected in each site. They and the other selected interventions, hold promise for capitalizing on underused agricultural potential to improve diets, while working with (or improving) existing gender relationships and power structures. The process for identifying NSA interventions was thorough and identified reasonable candidates, but it was very time consuming. Further efforts should focus on streamlining the process, so that promising and appropriate NSA interventions can be identified quickly and reliably.     

低碳新曙光

“日月开新元,天地又一春。”伴随着2010年浑厚的钟声,沐浴着冉冉升起的朝阳,低碳经济的曙光正向我们走来。     

聚变裂变混合发电堆水冷包层中子学设计分析

主要针对聚变裂变混合发电堆FDS-EM水冷包层的能量倍增因子M和氚增殖率TBR等中子学参数进行优化计算。FDS-EM包层主要设计目标是在氚自持的基础上获得约1 GW的电功率,并且尽可能长时间连续运行不换料。通过初步设计分析给出一个使用核废料(压水堆卸出的废料钚、锕系加上贫铀)作为裂变燃料,能够实现氚自持、能量倍增因子约为90等设计目标,且连续运行至少10年不换料的中子学方案。     

Investigation on hot deformation behavior and mathematical models of flow stress of high-strength structural steel

The effect of deformation conditions on dynamic recrystallization behavior of Nb,V,Ti microalloyed high-strength structural steel was investigated via high-temperature single pass reduction tests on a MMS-300 thermomechanical simulator,with mathematical models established for flow stress during hot deformation.The results show that the deformation resistance decreases with the increase of temperature and is in power function relationship with the temperature.Meanwhile,it increases with the increase of st...     

UPS电源的现状、发展及选配

本文主要叙述UPS电源在技术上、管理体系上、设计原理上,以及功能和应用方面的现状及未来的发展趋势,并对用户如何选配UPS电源作了详细论述。希望能对广大用户认识和配置UPS电源起到一定的指导作用。     

整流后滤波用电解电容的选择

整流滤波用电解电容器容值的改变不仅影响输出电压,还会影响电容本身的纹波电流,进而对损耗和电容本身的寿命带来影响。本文建立了滤波电容纹波电流的数学模型,利用Saber仿真结果和计算结果对比验证了模型的正确性。基于所建立的数学模型分析了容值变化对纹波电流和电容损耗的影响,进一步完善了滤波电容的选取依据。     

基于UC1901的行波管灯丝电源的设计

讨论了UC1901芯片在行波管灯丝电源中的应用,给出了所涉及的重要参数设计准则和设计方法,并采用该芯片实现了稳压灯丝电源。     

单端变换器在行波管电源中的应用

分析了一种单端正激变换器的衍生电路,给出它的优缺点,结合行波管电源的要求,对电路进行了试验,给出相关试验波形。     

第三届长江论坛及长江-欧盟高层对话会

第三届长江论坛将于2009年4月19日至21日在上海举行,论坛由上海市人民政府和长江水利委员会主办,中国-欧盟流域管理项目、世界自然基金会和美国大自然保护协会协办。     

基于语义知识的汉语句法结构排歧

汉语在词类这个语言层次上存在着许多歧义结构,这给汉语的自动句法分析带来了难以逾越的障碍。通过寻找汉语语义类之间可能存在的句法关系建立汉语语义关联网,这为用汉语语义知识来解决句法歧义开辟了道路。文章针对具体的汉语歧义结构研究具体的解决办法,从而减少了计算的复杂度。