层次分析法在喷粉桩与沉管灌注桩方案优选中的应用

运用层次分析法建立了喷粉桩与沉管灌注桩的比较优选模型，结合工程实例介绍了模型的具体运用。     

基于PRO-E和ADAMS的双轴高效混合机建模及仿真分析

文章以PRO-E软件为基础,结合ADAMS软件仿真优势,构建出卧式双轴高效桨叶式混合机ADAMS工作模型,对其按工作实际进行运行仿真,并对其在工作过程中转子叶片端面线速度、端面的位移等参数进行仿真测量,进一步说明其工作性能及优越性,更加直观地了解自动变速器的工作机理。     

Impaired littoral energy pathways cause a shift to pelagic resources by fish in recovering lake food webs

Fish communities may increase in biomass and productivity due to energy subsidies from the littoral invertebrate community. In lakes recovering from acidification and metal contamination, such as those in Sudbury, Ontario, Canada, impaired benthic invertebrate communities (i.e., low diversity with higher abundance of small‐bodied taxa) allowed a critical test of the role of these littoral pathways on fish diet. We compared fish abundance, diversity, diet and biomass in eight recovering and eight reference lakes and related availability of the main littoral and pelagic invertebrate groups to fish diet regime using stable isotope analysis. A Bayesian mixing model (MixSIR) was used to estimate diet likelihood, and convex hull analysis was used to estimate trophic niche space of fish communities. Fish biomass did not differ between impaired and reference lakes despite substantial differences in potential diet. Fish depended strongly on littoral benthos in the reference lakes but consumed more pelagic food in the impaired lakes. The trophic niche of the focal, most common fish species (i.e., yellow perch, smallmouth bass, pumpkinseed and brown bullhead) was larger in the impaired lakes. We attributed these differences to low diversity at the highest trophic levels of fish communities in the impaired lakes as well as to depauperate benthic invertebrate communities. In contrast to the food webs of most temperate lakes, fish in impaired lakes preyed less on littoral invertebrates yet still managed to maintain a reference lake level of biomass standing crop by relying more on pelagic resources – macro zooplankton such as Chaoborus.     

日工NBD240型沥青拌合站的维护与保养

沥青混凝土拌合站是沥青路面施工中保证施工质量、提高路面工程效益的关键设备.日工NBD240型沥青拌合站是高等级路面施工的常用设备,使用过程中,需要对其电气部分的操作室和电器线路,机械部位的冷料供给系统及主燃烧器、烘干滚筒、除尘系统,骨料提升机、矿粉提升机、振动筛、热料仓、称量系统及搅拌机,沥青供给系统中的沥青泵滤网、导热油炉,气路系统的主楼空压机、供气管道等进行保养和维护.本文分析和总结了该设备在日常工作中的保养和维护注意事项,旨在为其使用提供参考依据.     

真空降水预压及水泥搅拌桩在桥坡加固中的应用

为有效治理桥头跳车现象,减小桥坡工后沉降,针对填土速率、桥台侧向位移、总沉降及分层沉降等技术参数,提出了相应的技术措施,重点对真空降水预压和水泥搅拌桩进行比较分析.分析结果认为,对软土层较薄、填土高度较低的路段,可只做浅层处理,采取换土法、石灰短桩法,辅以砂垫层、复合土工布等减小不均匀沉降;对于深层处理方法,在桥坡填土较高、填土速率较快的条件下,真空降水预压法较经济但侧向位移相对较大,水泥搅拌桩加固法侧向挤压力较小但费用较大,结合工程实践对上述问题进行了改进和探索.     

浅谈混凝土搅拌设备水的计量方式

本文结合目前混凝土搅抖设备的应用,论述了混凝土搅拌设备的两种水计量方式及优缺点对比.     

西部成品油管道混油切割新方法

在确保油品质量安全的前提下，持续改进混油切割方法，可以有效降低混油切割量，提高管道运营公司的经济效益。通过总结西部成品油管道实际运行过程中混油段过站时混油量的变化规律，并与沿程混油量的理论变化情况相印证，提出了以末站上游新堡站的混油量为基准增加50m3作为末站混油切割目标量的方法，并应用于实际生产，效果明显。该方法解决了因后行油品密度无法提前准确确定，在计算第2个混油切割点时，经常误差较大，易造成混油切割量偏大或者油品不合格的问题。（图2，参5）     

清型芦笋沙棘胡萝卜混合果蔬汁饮料研究

用对比试验及正交试验确定了芦笋沙棘胡萝卜混合果蔬汁饮料的果蔬汁澄清条件及生产配方。芦笋沙棘胡萝卜混合果蔬汁的最适澄清条件为：混合果蔬汁用180mg／kg明胶在12℃下沉淀澄清处理16h后，再用60mg／kg的Ec3.2.1.5果胶酶在45℃条件下澄清处理3h，果蔬汁的透明度最好。芦笋、沙棘、胡萝卜混合果蔬汁饮料的最优配方组成为：混合汁含量500g／kg，砂糖含量100g／kg，柠檬酸含量1．5g／kg，香精用量1g／kg，饮料的综合品质较理想。     

水泥搅拌桩的设计、施工及检测

对水泥搅拌桩在设计、施工、检测等方面作了全面阐述,并且提出了若干注意事项及合理化建议。