Effects of alternating temperatures on development and reproduction of the armyworm,Mythimna separata (Walker)

Effects of cycling and constant temperature on development and reproduction of the armyworm, Mythimna separata (Walker) were investigated by rearing the insects on the artificial diet under temperatures covering low(16-24℃ vs. 20 ℃ ), medial(20-28℃ vs. 24℃ ) and high(24-32 ℃ vs. 28 ℃) regions. In the low region, all the immature stages of the insect developed significantly faster under alternating temperatures than at corresponding constant temperatures. For the medial region, their development was little affected by variable temperatures. For the high region, developmental durations tended to be longer under cycling temperatures except egg stage.Mean fecundities of the adult moths markedly increased under cycling temperatures as compared with those at respective constant temperature in all regions.Possible reasons for effect of alternating temperatures on insect development are discussed in some details.     

Blood chemistry of human fetuses in the second and third trimesters

Six biochemical parameters and four enzyme activities were determined from the serum of 76 healthy and 56 pathological human fetuses between the 20th and 38th week of pregnancy. In the normal fetuses studied within that period, creatinine, immunoglobulin M, lactate dehydrogenase, and gamma-glutamyltransferase increased; haemoglobin F and glucose progressively decreased; and alkaline phosphatase was at a peak around the 26th week; cholesterol and triglycerides were always low. The same parameters were also measured in some of the pathological fetuses and compared with their normal counterparts.     

缺氧及两级好氧处理岳阳化工总厂部分废水的运行与分析

介绍了岳阳化工总厂部分废水的处理工艺和设计，针对原水水质COD高等特点，采用缺氧，两级好氧工艺，该厂进生化池：COD浓度1000－14000mg/L,BOD3:COD=0.5左右；出生化池：COD浓度＜120mg/L，低于GB8978－1996表4中石油化工工业规定的Ⅱ级排放标准，BOD3＜10mg/L^ ，低于GB8978－1996表4石油化工工业规定的1级排放标准。     

LC4铝合金呆扳手成形热力学参数的确定

通过试验研究了LC4铝合金呆扳手成形的温度、变形程度、变形速度、加热方式和加热速度等成形热力学参数与成形质量之间的关系。解决了试验过程中出现的一些问题,确定了最佳成形工艺参数为:始锻温度400～450℃、终锻温度350℃左右,第1阶段的变形量为30%～50%,第2阶段的变形量为75%。     

电生羟基自由基降解有机染料的研究

以Pb／PbO2为工作电极，以CoSO4为催化剂，利用电生羟基自由基对中性红、罗丹明B、碱性品红等3种有机染料进行了降解。并且研究了电解电位、pH值、温度等因素对染料降解脱色的影响。结果表明．脱色率接近100％，COD去除率达90％以上。实验证明反应符合一级反应动力学模式，实验还测定了动力学参数。     

数理统计分析法在确定仪器最佳分析条件中的应用

为了能用最少的实验次数，找到最佳的实验条件，将数理统计中的均匀设计与正交设计方法联用，对气相色谱法分析CO实验条件进行重新筛选，找到了一条新途径。该方法既节省人力、物力，又能避免一些被忽视或遗漏的条件。     

文丘里洗涤器除尘操作参数的优化设计与工程实践

通过理论分析,对工业文丘里洗涤器的操作参数进行了优化设计,推导出了最佳气速与液气比的计算公式,并已应用于工业生产。     

Optimization of control parameters for petroleum waste composting

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DRASTIC评价模型在台州市浅层地下水脆弱性评价中的应用

本文介绍了DRASTIC评价体系在台州市浅层地下水的脆弱性评价中的应用。根据台州市的地质背景、水文地质条件等,对DRASTIC评价指标进行改进,选择了地下水埋深等4个参数作为研究区地下水脆弱性评价因子,建立了台州市浅层地下水脆弱性评价模型。结合G IS技术对该地区的地下水脆弱性进行了评价,编制了地下水脆弱性评价图。综合评价的结果表明改进的DScTI评价模型能合理的反映台州市浅层地下水环境脆弱性的高低。     

氧化沟工艺处理化纤废水的研究

针对化纤废水含有各种难降解有机物 ,采用氧化沟处理工艺对化纤厂废水进行了研究。结果证明这种方法是可行的 ,其具有处理效果稳定、产泥量少、还有一定的消泡作用等优点。同时本研究提出了主要设计参数