Relationship between CO<Subscript>2</Subscript> at a rural site and integral measures of atmospheric stagnation,recirculation, and ventilation

Integral quantities, wind run, S, and recirculation factor, R, useful for describing air flow, are calculated and combined with CO₂ mixing ratios. Meteorological observations were obtained from a RASS sodar and CO₂ mixing ratios from a continuous analyzer installed at a rural site in the upper Spanish plateau. The measuring campaign spread over 3 years and two approaches were followed. The first approach considered integral quantities on a daily basis and two classifications of air flow, to date scarcely used. The first classification distinguished among stagnation, recirculation, and ventilation, the second considering synoptic, meso-, and local scales. Moreover, 52.94% of daily values handled in this paper corresponded to ventilation and 49.70% to synoptic scale. The main goal of this approach is the subsequent link between the two classifications: the synoptic scale was associated with ventilation, mesoscale with recirculation and local scale partially with recirculation. CO₂ observations were distributed in air flow groups following these classifications and mesoscale processes were satisfactorily described since noticeable evidence of transport from nearby cities was observed. In the second approach, S and R pairs were used and CO₂ mixing ratios were distributed following percent intervals of ventilation, calculated by binning these pairs. The main goal of the second approach is to consider only three groups of mixing ratios. In the first group, with high ventilation, mixing ratios were low. With intermediate ventilation, mixing ratios were medium, and with low ventilation mixing ratios were high. A contrast of 21 ppm between the third and first groups was obtained at the 95th percentile. Finally, the second group provided a contrast of 3 ppm between north and south directions and also between east and west attributed to transport from nearby cities.     

海河天津段微囊藻及其毒素的空间分布及与水环境因子的关系

采取荧光定量PCR技术及ELISA酶联免疫吸附法,以mcyD基因和PC-IGS基因为靶基因对夏季蓝藻暴发期间海河天津市区段的产毒微囊藻种群丰度和毒素含量进行了研究.结果表明：夏季海河天津市区段微囊藻种群丰度具有明显差异性：产毒微囊藻种群丰度为1.16×10⁴~2.48×10⁷copies/mL占总微囊藻种群的4.25%~28.59%.藻毒素含量最高点为8号采样点天津站,每升水体中藻细胞共含毒素195.51μg,除去藻细胞水中毒素浓度为0.97μg/L.总的来说,海河天津市区段微囊藻总基因拷贝数较高,产毒微囊藻丰度在不同采样点间差异较大,影响水体中微囊藻丰度的最主要环境因素是pH值.海河水体中毒素含量没有超过安全阈值,但是单位体积水体中藻细胞内毒素含量很高,具有较高的毒素释放潜力,可能对下游河口生态系统造成潜在威胁.     

工业废液中镍钴的回收及在锂离子电池正极材料中的应用

探索了从废液中回收镍钴在空气气氛下合成锂离子电池正级材料ＬｉＮｉ２Ｃｏ１－ｘＯ２的方法和工艺。结果表明，合成材料的充放电性能都比较好，ＬｉＮｉ０．３Ｃｏ０．７Ｏ２在６００℃６ｈ－７５０℃１６ｈ时制得的产物初始充电容量达１５４．９３８ｍＡｈ／ｇ，接近用分析纯的镍钴原料合成的正级材料ＬｉＮｉ０．３Ｃｏ０．７Ｏ２的首次充电容量（１５６．１４６ｍＡｈ／ｇ），采用镍钴废液合成锂离子电池正极材料，化害为利，经     

不锈钢/铝(铝合金)/不锈钢多层复合板残余应力研究

采用取条法和化学浸蚀法相结合对不锈钢 /铝 (铝合金 ) /不锈钢多层复合板的残余应力值进行了测量。结果表明外层不锈钢受到长度和宽度方向的残余拉应力作用 ,随着轧制复合变形量的增加 ,多层复合板的残余应力值会逐渐增大。此外还通过热 力耦合的弹塑性有限元法对不锈钢 /铝 (铝合金 ) /不锈钢多层复合板的残余应力场进行了模拟仿真 ,并将模拟结果与试验测量值进行了分析和对比。     

三层复合板的r值研究

通过拉伸实验测试了不锈钢 /铝合金 /不锈钢三层复合板的厚向异性系数r,并分析了扩散退火对r值的影响及r值对板材成形性能的影响。分析表明 :扩散退火会降低r值和提高n值。用平均r值和rmin 来判断拉延危险断面的抗拉强度其误差在 6 %左右。     

部分酯类化合物对四膜虫毒性的全息QSAR分析

全息定量结构活性相关分析(HolographicQSAR或HQSAR)能快速而简便的产生高统计质量和预测能力的QSAR模型。采用HQSAR分析了30个酯类化合物对四膜虫的毒性与分子结构之间的关系,及分子碎片大小和全息长度对QSAR模型的影响,得到的最佳QSAR模型的R2为0.981,Q2为0.912。此外还应用色码讨论了离群值产生的可能原因。     

2000年～2001年5月国内环境事件数据

简要介绍了2000年-2001年5月国内发生的各种环境事件,包括沙尘天气、赤潮、污染事件、山体滑坡。虫害、自然灾害等,进行了统计和分析。     

中小型露天矿山爆破飞石最远飞散距离预测研究

爆破飞石事故给中小型露天矿山安全生产带来了极大的困扰,对周边人、机、环境系统带来严重的破坏.将线性回归分析引入爆破飞石最远飞散距离研究中,以矿山炸药单耗、最小抵抗线和边坡高度为主要因素,建立正交试验,模拟不同组合条件下爆破飞石最远飞散距离,最后进行回归分析,得出爆破飞石最远飞散距离的预测公式,提高预测精度,为日后中小型...     

湿式纤维栅除尘器在KQl50型潜孔钻上的应用

介绍了用惯性除尘器、旋风除尘器、湿式纤维栅除尘器组成的三级串联除尘系统进行露天矿的钻机收尘,运行结果表明该系统运行可靠,阻力小,除尘效率高,系统出口含尘浓度达到排放标准.