露天矿潜孔钻机泡沫发生器的性能实验

为解决露天矿潜孔钻机作业粉尘污染严重的问题,从传统除尘技术应用效果差、耗风量大、取水困难等事实出发,根据泡沫除尘机理及两相泡沫发泡原理,设计了一种适用于露天矿潜孔钻机的泡沫发生器,并对其发泡性能进行研究.通过开展泡沫发生器的泡沫流量、发泡倍数及半衰期等性能实验,确定出影响泡沫发生器发泡性能的主要因素,得出泡沫发生器的最佳工况点.实验结果表明:气体流量、液体流量(气液比)、发泡网及发泡剂质量分数是影响泡沫发生器发泡性能的4个主要因素,在工况为发泡网1、质量分数1.5%的配方2、气体压力0.7 MPa、液体流量18 L/min及气体流量30 m~3/h条件下,泡沫发生器发泡性能达到最佳,其流量为515 L/min,发泡倍数为22,半衰期为65 min.经现场试验,泡沫除尘后采场平均降尘率高达90%以上,应用效果良好.     

79Se半衰期计算

介绍了用log ft系统学计算⁷⁹Se半衰期的方法。根据系统学计算和与实验测量数据的比较，推荐了⁷⁹Se的半衰期。给出了⁷⁹Se衰变纲图并计算得到了⁷⁹Se辐射数据。      

四种胺类捕收剂体系中两相泡沫和赤铁矿/石英三相泡沫的稳定性

选取赤铁矿和石英两种纯矿物,十二胺、十二烷基三甲基氯化铵、GE609、N-十二烷基乙二胺四种胺类捕收剂,研究了不同pH值和捕收剂浓度对两相泡沫稳定性的影响以及不同粒级的赤铁矿和石英对三相泡沫稳定性的影响。结果表明,除N-十二烷基乙二胺外,其余三种胺类捕收剂溶液的泡沫半衰期均随着捕收剂浓度的增加呈现先升高后降低的趋势,且泡沫稳定性总体呈现酸性>中性>碱性的规律。N-十二烷基乙二胺的泡沫半衰期随浓度的增加逐渐升高,泡沫稳定性呈现碱性>中性>酸性的规律;在四种胺类捕收剂体系中,加入不同粒级石英或者赤铁矿颗粒后均能够在一定程度上提高泡沫的稳定性,颗粒粒度越细,泡沫越稳定,-18μm粒级石英颗粒的影响尤为明显;石英提高泡沫稳定性的程度远高于赤铁矿,加入细粒级的石英颗粒能够大幅度提高泡沫稳定性。微细粒级石英是急剧提高胺类捕收剂浮选泡沫稳定性的关键因素。     

百菌清在真姬菇及培养料中的残留

为评价百菌清在真姬菇培养料中使用后的残留行为和真姬菇中食品安全性,按照国家标准规定的百菌清最大残留量的2000倍量在培养料中施用后采用工厂化栽培,研究了百菌清在真姬菇培养料中的残留动态。样品中的百菌清采用乙腈提取,固相微萃取柱净化,气相色谱-电子捕获检测器检测的分析方法,外标法定量。仪器最小检出限为3.1×10-11g,方法最低检出质量分数为0.06mg/kg,样本添加回收率在87.6%～107.0%。残留试验研究结果表明,在整个培养期间百菌清在培养料中降解较快,残留半衰期为2.6～4.8d,在收获时真姬菇和培养料中均无残留百菌清检出。     

PUBLIC OPINION,TRADITION, AND INFORMATION HALF-LIFE†

The information needs of a complex society are not met by an information-flow technology invented and developed in traditional societies. This article provides a theoretical framework derived from modern systems theory by which to understand the technology of public opinion policy formation in guidance operations of a complex society. Qualitative models of information flow systems are presented together with a discussion of the kind of society each information flow technology produces. Three are considered: tradition-based information-flow societies, managed information-flow societies (Utopian and elitist), and cybernetic issue-based information-flow societies.     

剪切速率对泡沫流体性能的影响

利用不同的剪切速率对一定体积的起泡液进行搅拌,形成不同泡沫质量的泡沫体系,通过测量起泡体积、半衰期、泡沫综合指数、有效黏度等参数,考察剪切速率对泡沫体系性能的影响。结果表明:相对于起泡性能,泡沫稳定性对泡沫综合指数的影响更大;要达到较高的泡沫综合指数,所需的起泡液黏度应在50mPa·s左右,生成泡沫所需的的最佳剪切速率为900s-1;随着泡沫质量增大,泡沫液的有效黏度增大;为了使泡沫具有一定的有效黏度,起泡所用的剪切速率要在864s-1以上,生成泡沫的泡沫质量要保持在74%~95%。     

Short communication: Repeatability of intravenous glucose tolerance test traits in young Holstein-Friesian cattle

Few studies have compared individual variability of an intravenous glucose tolerance test (ivGTT) obtained daily in young cattle. The objective of this study was to evaluate the repeatability of glucose traits and insulin responses derived from ivGTT during 3 consecutive days in Holstein-Friesian cattle (bulls: n = 4, steers: n = 3, heifers: n = 3). Blood collections were performed from min 0 (basal concentrations) to min 63 (last measurement). Additional estimates included maximal concentration for glucose and insulin, glucose half-life time (GHLT), and glucose and insulin area under the curve. Glucose traits showed higher repeatability when compared with insulin responses. On average, the glucose trait and insulin response with the lowest coefficient of variation was GHLT (0.7%) and insulin area under the curve (21.3%), respectively. In addition, a general linear model with repeated measures was used to test for significant differences in glucose and insulin concentrations over time at different trial days. Both glucose and insulin concentrations were influenced by time point but not by trial day or time point × trial day. The results from this study showed that individual insulin responses were more variable than glucose traits. The high repeatability of GHLT evidenced the strict regulatory glucose disposal mechanisms occurring in young Holstein-Friesian cattle, whereas insulin responses showed high variability despite controlled management and nutritional practices.     

平菇及其培养料中5种拟除虫菊酯类农药的残留消解动态

在确证平菇培养料中联苯菊酯、甲氰菊酯、高效氟氯氰菊酯、高效氯氰菊酯和溴氰菊酯5种拟除虫菊酯类农药多残留分析方法的基础上,研究供试拟除虫菊酯类农药在平菇和培养料中的消解动态规律。结果表明:5种供试拟除虫菊酯类农药在平菇和培养料中的消解半衰期分别为3.01～5.06、25.48～54.59d。平菇培养料的灭菌会显著减少其中拟除虫菊酯类农药的残留量,降解率达18.80%～61.16%。平菇在含有联苯菊酯等5种拟除虫菊酯类农药的培养料中栽培42、62、83、103d后,培养料中供试农药残留量仍较高,分别为1.29～7.40、1.55～6.81、0.32～1.78、0.14～1.76mg/kg,同步采集的平菇子实体中均未检测到供试农药的残留量。因此,平菇培养料中供试拟除虫菊酯类农药残留不会向平菇子实体转移,对食用菌产品质量安全的影响较小。     

灭多威在棉花及土壤中降解动态及残留量研究

按生产上常规用量，每亩喷施２０％灭多威乳油６０毫升防治二代棉铃虫，施药后７天在棉叶上及１４天在土壤中其降解率分别为９８．８１％及８８．０９％；半衰期分别的１．５６天及４．９８天。防治二、三、四代棉铃虫，按有效剂量施药６次，有效成分７２克／亩，棉籽和土壤中的最大残留量分别为０．０２３及０．０８４微克／克；再加大５０％用量，有效成分１０８克／亩，最大残留量仅为０．０３４及０．２１４微克／克。结果表明，灭多威在棉叶上及土壤中降解较迅速，常规用量下，对棉籽及土壤污染较轻。     

中性pH值下CuO-H_2O_2催化矿化苯酚

中性常压条件下研究了不同因素对CuO-H2O2矿化模型底物苯酚的影响。引入H2O2矿化指数(X)、矿化半衰期(t1/2)概念,结合总碳(TOC)去除及氧化剂分解规律,对催化矿化进行分析。结果表明:温度、催化剂、氧化剂、初始TOC质量浓度的增加均能不同程度地加速TOC去除,矿化半衰期t1/2更短。随温度、氧化剂浓度提高,H202矿化指数X先增加后减小,随初始TOC及催化剂质量浓度提高X分别增加和减小。提出了羟基自由基矿化机理,紫外可见分光光谱分析表明底物先被氧化为某些中间产物,再被矿化为CO2和H2O。