遗传算法在相控阵子阵量化随机馈相中的应用

在大型相控阵中,为了减少昂贵的数字移相器,一般采用子阵技术.但这又带来新的问题,子阵相位量化时,到底是采用前一个单元的相位还是采用后一个单元的相位,量化时是舍去还是进入,这些都给子阵相位量化的分析增加了复杂性.在子阵量化随机馈相的基础上,采用遗传算法对子阵量化中各种随机馈相的方案进行优化,并给出应用实例,取得了令人满意的优化结果.     

农村生态住宅的设计对策之思考

农村生态住宅有广阔的发展前景 ;从选址、选材、单体设计和节能等方面 ,提出了对农村生态住宅进行合理化设计的对策。     

乌鳢、鲶和黄颡鱼摄食器官的比较研究

2000年4月－2001年6月,作者对乌鳢、鲶和黄颡鱼的摄食器官进行了解剖,重点比较了其口腔齿、咽磨、鳃耙的结构,分析了它们的摄食特点。     

新疆兵团102团池塘主养鲤鱼高产技术效益剖析

102团水源及光热资源丰富,池塘养鱼6.67hm^2,实现集约化养鲤,成鱼和鱼种生产投入与产出比分别为1：1,12和1：1．10;平均每公顷盈利分别为8091．83元和4016．04元。     

Determination of optimum operating conditions for production of polyhydroxybutyrate by activated sludge submitted to dynamic feeding regime

Polyhydroxybutyrate (PHB) was produced by activated sludge in a two-stage process. In the first stage, the sludge with high storage potential was enriched in a sequencing batch reactor (SBR) operated by a dynamic feeding regime. The biosynthesis of PHB was sequentially accomplished in a batch reactor in the second stage. This article focused on the optimization of PHB content by evaluating the effects of three critical factors: Dissolved oxygen, pH and food-to-microorganism (F/M) ratio in the batch reactor. The results showed that the rate of substrate uptake, as well as the yield and content of PHB increased with the increase of dissolved oxygen concentration. The control of pH was not necessary under the weak alkaline condition for improvement of PHB content, except for the case in which the pH value was out of rang of 7.0 to 10.0. The enhanced F/M ratio favored PHB accumulation in the range of 1.0 to 4.5 C-mmol/C-mmol and the highest PHB content, 64%, was achieved at 4.5 C-mmol/C-mmol. When F/M ratio was enhanced to 6.0 C-mmol/C-mmol, the phenomenon of utilizing simultaneously intracellular PHB and external substrate by sludge was observed, which resulted in a sharp decrease of PHB content. The microscopic observation clearly confirmed that dynamic feeding regime was effective for selecting and enriching the sludge with a high storage potential. Supported by National Natural Science Foundation of China (Grant No. 50621804)     

The mitochondrial function was impaired in APP knockout mouse embryo fibroblast cells

The amyloid precursor protein (APP) is recognized as the source of Aβ, which plays an important role in Alzheimer’s disease. However, the biological function of APP is obscure. Previous studies showed that mitochondria could be a target of APP. In this work, APP knockout mouse embryo fibroblast (MEF) cells were used to test if APP plays any role in maintaining the mitochondrial function. As the result, APP knockout MEF cells (APP-/- cells) showed the abnormal mitochondrial function, including slower cell pr...     

应用螺蛳进行污泥减量处理

选用螺蛳为模拟实验生物, 利用其摄食污泥的特性, 考察了不同环境条件下的摄食率及污泥减量效果, 从而实现污泥减量化的目的. 结果表明, 螺蛳的污泥减量速率随投放量和初始混合液悬浮固体浓度(mixed liquid suspended solids, MLSS)的升高而呈上升趋势. 通过模拟不同生存环境(高氧、低氧)的实验对比表明, 在溶解氧(dissolved oxygen, DO)充足的条件下螺蛳具有良好的污泥减量效果. 螺蛳对MLSS、混合液挥发性悬浮固体浓度(mixed liquor volatile suspended solids, MLVSS)的去除率可分别达到40.01%, 47.54%, 符合污泥稳定化的要求.     

马边大风顶自然保护区大熊猫的食性与采食行为

报道了凉山马边大风顶自然保护区大熊猫的食性和采食行为，根据一年中大熊猫食物组成的变化规律将大熊猫的摄食分为４个时期；食叶期，过渡Ｉ期，食杆－笋期和过渡Ⅱ期，并对其采食行为进行了研究。     

微机控制立窑差热煅烧喂料操作系统的实现

利用微电脑控制机立窑喂料机,严格控制边、中料的上料时间及加料区,稳定了立窑差热煅烧热工制度.确保煅烧操作"三平衡”.使立窑机械化生产迈向自动化.