微生态制剂对生物挂膜及牙鲆生长的影响研究

针对工厂化循环水养殖系统中生物滤池去除有害污染物质的核心问题,采用单因素梯度设计,添加50(1#),100(2#),250(3#),500(4#),1000(5#),1500(6#)g微生态制剂辅助自然微生物在生物载体上进行人工挂膜,挂膜2周后,进行40 d循环水养殖牙鲆(paralichthys olivaceus)...     

基于MapX Mobile开发的个人移动导航系统

随着导航技术的发展,个人移动导航系统成为人们关注的热点。本文介绍了一种基于MapX Mobile开发的个人移动导航系统,实现GPS信号的接收和处理、GPS信号点的地图匹配。通过对地图上导航点、线的设置,可以在PDA上准确、快速地进行自主导航。     

健跳港上游引水对海床冲淤影响的数值模拟分析

健跳港是一个狭长的淤泥质港汊,针对枯季和洪季健跳港海床不同的冲淤特点,利用一维潮流泥沙模型复演了该港海床的冲淤过程,通过调整挟沙力系数来模拟健跳港枯水期的淤积和洪水期的冲刷这两种不同的海床变化形态,并预测了健跳港上游引水后对该港河床的淤积影响。     

埕北油田弱碱三元复合驱可行性实验研究

埕北油田具有原油黏度高、油层渗透能力强和非均质性严重等特点,水驱开发效果差,剩余油储量大,而生产平台工作时间已达到设计使用寿命,急需高效、快速的提高采收率技术。针对埕北油藏地质、流体性质和开发现状,利用仪器检测和理论分析方法,开展了聚合物溶液、三元复合体系和改性三元复合体系性质和调驱效果实验研究。结果表明,与三元复合体系相比较,添加入Cr^3＋后得到的改性三元复合体系在黏度和界面张力性质方面几乎没有发生变化,但其阻力系数和残余阻力系数有了较大幅度提高。在化学费用相近条件下,“调剖＋三元复合驱”和改性三元复合驱要比三元复合驱增油效果好,采收率增幅可以达到15％以上。推荐埕北油田采用弱碱三元复合驱,三元复合体系配方组成为“大庆超高”聚合物（CP=1600～1800mg／L）＋弱碱Na2CO3（CA=0．6％～1．0％）＋重烷基苯石油磺酸盐（Cs=0．10％～0．15％）＋有机铬（聚：Cr^3＋=120：1～240：1）”,段塞组合方式为“0．025～0．05 PV Cr^3＋聚合物凝胶＋0．12～0．15PV三元复合体系”。     

复合酶制剂对中国对虾消化率的影响

添加复合酶制剂，可以提高对虾内源酶的活性，增强肝胰脏的消化作用。 对虾饲料中添加１％。复合酶制剂可使对虾总消化率和蛋白质消化率分别提高 ４．８１％和２．４６％。     

PS剂驱油矿场先导性试验研究

PS碱木素磺酸盐 (简称 PS剂 )是由造纸废液经浓缩加入酚、醛和硫酸等在高温下复配或反应后提炼出的 1种新型表面活性剂。由于其具有降低原油粘度和油水界面张力的特性[1 -2 ] ,因而可作为提高原油采收率的驱替剂应用到油田开采中。本文通过室内实验和 W31断块的现场驱替试验 ,进一步探讨了 PS剂的驱替机理和驱油效果、探索了注 PS剂驱油的现场经验。     

砂砾性低渗气层水锁效应及减轻方法的试验研究

采用来自胜利油田的岩样,通过水锁效应对岩样渗透率影响的试验研究证实了水锁效应是导致砂砾性低渗气层损害的主要原因之一。然后对油田常用的表面活必地表面张力的测定,并在此基础上进行了优选,最后对用表面活性剂减轻岩样水锁效应的效果进行了评价试验。     

Reimagining e-waste circuits: calculation,mobile policies,and the move to urban mining in Global South cities

In this article, I describe how calculative practices of enumeration and visualization mobilized by policy actors to govern the multiple mobilities of e-waste and its re-materialization as value in the informal-recycling economies of Global South cities have resulted in e-waste being recalibrated as an “urban mine.” To properly govern and fully exploit e-waste qua urban mines, policy actors have developed the Best-of-2-Worlds (Bo2W) model. I show that the antecedent of the Bo2W model is the Clean e-Waste Channel implemented in Bangalore, India’s “Cyber City,” which has retroactively been recast as the first successful implementation of the Bo2W model. While policy actors mobilize Bangalore’s success to boost this model and facilitate its mobility to other Global South cities, I conclude by offering a critical assessment of the Bo2W model for the prospects of informal recyclers in Global South cities and the creation of uneven geographies of e-waste toxicity.     

熔融制样X射线荧光光谱法测定铜矿石中16种主次量元素

铜矿石类型繁多,矿石赋存状态各异,成分复杂。在现有的铜矿石熔融制样X射线荧光光谱（XRF）分析方法中,选取标准物质个数和矿石类型少、分析范围宽,与实际样品类型相差太大,且制备的熔融片质量不高。本文选用铜含量既有良好浓度变化范围,又符合铜矿石常见含量的包括铜金银铅锌钼铜镍等各类矿石的24个标准物质,以四硼酸锂-偏硼酸锂-氟化锂为混合熔剂,熔剂与样品质量比为30：1,以溴化锂为脱模剂,改进样品预处理方式,将通常采用样品预氧化后或熔融中加入脱模剂的方式,改进为加入脱模剂后再用混合熔剂完全覆盖的方法制备了高质量的熔融片,建立了XRF测定铜矿石中铜锌铅硅铝铁钛锰钙钾镁钼铋锑钴镍16种元素的分析方法。分析铜矿石国家标准物质GBW 07164、GBW 07169,各元素的精密度（RSD）为0.1%~5.4%。分析国家标准物质GBW 07163（多金属矿石）、GBW 07170（铜矿石）的测定值与标准值相符;分析实际铜矿石样品,铜锌铅钼铋锑钴镍的测试结果与电感耦合等离子体发射光谱法和其他方法的测定值相符。本文方法扩大了基体的适应性,提高了实际应用价值。     

Evaluating the effects of land‐use development policies on ex‐urban forest cover: An integrated agent‐based GIS approach

We use a GIS‐based agent‐based model (ABM), named dynamic ecological exurban development (DEED), with spatial data in hypothetical scenarios to evaluate the individual and interacting effects of lot‐size zoning and municipal land‐acquisition strategies on possible forest‐cover outcomes in Scio Township, a municipality in Southeastern Michigan. Agent types, characteristics, behavioural methods, and landscape perceptions (i.e. landscape aesthetics) are empirically informed using survey data, spatial analyses, and a USDA methodology for mapping landscape aesthetic quality. Results from our scenario experiments computationally verified literature that show large lot‐size zoning policies lead to greater sprawl, and large lot‐size zoning policies can lead to increased forest cover, although we found this effect to be small relative to municipal land acquisition. The return on land acquisition for forest conservation was strongly affected by the location strategy used to select parcels for conservation. Furthermore, the location strategy for forest conservation land acquisition was more effective at increasing aggregate forest levels than the independent zoning policies, the quantity of area acquired for forest conservation, and any combination of the two. The results using an integrated GIS and ABM framework for evaluating land‐use development policies on forest cover provide additional insight into how these types of policies may act out over time and what aspects of the policies were more influential towards the goal of maximising forest cover.