脱氮硫杆菌对污水中硝酸根离子处理的研究

为研究脱氮硫杆菌对硝酸根离子的去除情况,对脱氮硫杆菌进行培养,探讨其脱氮能力、培养过程中的环境影响因素、反应中产生"黑泥"的成分、脱氮后+5价氮的去向。研究结果表明:脱氮硫杆菌以硝酸根离子作为电子受体,将其还原为氮气来实现硝酸根离子的去除,在处理过程中,产生以Fe_2S_3与FeS为主要成分的黑泥,且黑泥作为电子供体而存在。     

FINE NUMERICAL SIMULATING TECHNIQUES FOR LITHOLOGICAL OIL RESERVOIRS

岩性油藏具有低压、低渗、低产的特点,且缺乏天然能量补给,油层供液能力不强,油井常规钻井、试油基本无自然产能.如何搞好该类油藏的精细描述,尽最大可能开发好该类油藏是迫切需要解决的问题.以镇泾油田ST2井区长62-2 2油藏为例,利用Eclipse油藏数值模拟软件建立了该区块油藏数值模型,结合油藏实际情况制定了“分阶段定目标,分油藏定流体,以应力定方向,以压力定水量,以质量定原则,以潜力定对策”拟合原则,通过多种手段修正数值模型,达到精细量化剩余油分布、优选油藏挖潜策略的目的.     

加强电力技术监督管理 提高生产安全水平

在电力生产过程中,各个环节联系紧密,任何一环出了问题,将产生由点及面,甚至到片的故障,将给企业、工农业生产带来相当严重的影响。所以,加强对电力技术监督管理,加强对电力安全生产环节的有效监督,显得尤其重要。文中从安全生产工作现状、电力技术监督管理意义及措施等方面展开了分析。     

Strength of Cu-28 wt%Ag composite solidified under high magnetic field followed by cold drawing

Cu-Ag composite is one of the best conductors for high-field magnets. Increasing its strength is crucial for designing newer high-field magnets. Cu-28 wt%Ag samples were solidified with and without a 12-T high magnetic field (HMF), and then cold-drawn. We investigated the influence of HMF on microstructure, hardness and strength of Cu-Ag samples both before and after cold-drawing. The introduction of external HMF during solidification increased both the dendrite arm spacing and the dissolved Ag in Cu, and it reduced the spacing between both the Ag precipitates in proeutectic Cu and the eutectic lamellae. The transversal microstructure after cold-drawing inherited the network solidification structure, but at a refined scale. The Cu dendrite spacing in the 12-T HMF samples at all deformation strain was larger than that without HMF. HMF slightly increased the intensity of <111> fiber texture of Cu, which strengthened proeutectic Cu at the level of 3.5 deformation strain. In samples deformed to strain of 3.5, refined Ag precipitation spacing, increased Ag solubility in Cu matrix, and refined eutectic lamellar spacing by 12-T HMF increased the strength by 5% in the sample compared with that without HMF.     

Electrochemical performance of reduced graphene oxide in Spiro‐(1, 1')‐bipyrrolidinium tetrafluoroborate electrolyte

This paper investigates the relationship between structure and electrochemical performance of reduced graphene oxide (RGO) prepared via heat treatment and chemical reduction method. Structure and morphology of RGO was characterized by means of Fourier transform infrared spectroscopy, scanning electron microscopy, X‐ray diffraction and Brunauer–Emmett–Teller. Electrochemical performance of RGO electrode supercapacitor was investigated in the organic electrolyte by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance. The results show heat treatment RGO has high graphitization degree, less surface oxygen‐containing groups, good charge–discharge efficiency and stable life cycle. The chemical reduced RGO has single‐graphene structure, high specific surface area, high specific capacitance and low internal resistance. The ascorbic acid reduction RGO exhibits good comprehensive electrochemical performance: Its specific capacitance was 220.7 F g^?1, internal resistance was 3.0 Ω and charge–discharge efficiency was 97.0% after 2000 cycles of charging/discharging tests. Copyright © 2016 John Wiley & Sons, Ltd.     

Numerical study of the static and dynamic characteristics of reinforced concrete cassette structures for high‐rise buildings

High‐rise buildings are extensively built in China, and the structure of these buildings is composed of different types of conventional system of which framed structures are more commonly employed. A new cassette structure with advantageous performance properties is proposed. Static and dynamic numerical simulations were applied to investigate the characteristics of this new structure. First, the components and other details are presented. A comparative analysis was conducted between the cassette structure and traditional structures using eight finite models with fiber elements in three different heights. A static pushover analysis and an incremental dynamic analysis were conducted based on 18 near‐ground motion records recommended by the Federal Emergency Management Agency. The seismic characteristics, deformation curve, interstory drift, roof displacement, and fragility curve are investigated. Based on the analysis of the models with three different heights and the variety of seismic records, the economic advantage and application of cassette structures for building industrialization are also discussed.     

Medium-entropy (Ti,Zr, Hf)2SC MAX phase

Medium- and high-entropy alloys or ceramics for tuning the physicochemical properties of materials by the combination of multiple principal elements have received much interest. Herein, a medium-entropy (Ti, Zr, Hf)₂SC phase was synthesized attributing to the structural and chemical diversity of MAX phases. The crystal structure of (Ti, Zr, Hf)₂SC was determined by the Rietveld refinement of XRD, SEM, and atom-resolved TEM along with EDS elemental analysis. Phase evolution of X-ray diffraction patterns and TG/DSC curves were employed to reveal the synthesis mechanism of (Ti, Zr, Hf)₂SC from 2TiC–Zr–ZrC-2HfH₂-3.2FeS reactant system. The Vicker's hardness and the electrical resistivity of (Ti, Zr, Hf)₂SC were found higher than those of Ti₂SC, but the thermal conductivity of (Ti, Zr, Hf)₂SC was lower.     

高功率密度数据机房无连续制冷的风险分析

随着高功率密度数据中心的发展,空调系统的持续制冷能力已成为决定高功率密度数据中心能否安全、稳定运行的重要因素之一。本文通过实验对高功率密度数据机房无连续制冷的风险进行了分析,并结合实验结果对高功率密度数据中心的建设提出了一些建议。     

Docker容器化下的遥感算法程序集成方法

目的 近年来，随着我国遥感技术的快速发展，遥感数据呈现出大数据的特点，遥感数据的时效性增强，针对新环境下遥感算法编程语言众多，程序运行和部署环境需求多样，程序的集成和部署困难的问题，提出了一种遥感算法程序快速封装与Docker容器化系统集成架构。方法 该系统架构主要包括：1）遥感算法程序的镜像自动化封装制作；2）镜像的分发管理，达到算法程序镜像的共享；3）遥感信息产品生产流程的容器化编排服务，将相关联的算法程序镜像串联，以满足特定遥感信息产品的生产；4）容器的调度运行，调用镜像，实现特定遥感产品的容器化运行。本文在上述容器化系统集成架构下，以Landsat5数据的NDVI、NDWI信息产品的生产作为容器化生产实例，并同物理机、KVM （kernel-based virtual machine）虚拟机在运行时间、内存占用量、部署效率等性能进行了对比。结果 Docker容器虚拟化环境下的产品生产和物理机环境下在运行时间和内存占用量上几无差别，优于KVM虚拟机。Docker容器虚拟化环境和KVM虚拟机环境下在部署上能够节省大量时间，相比于物理机环境能够提高部署效率。结论 容器化的系统集成方式能够有效解决遥感算法程序集成和部署困难的问题，有利于遥感算法程序的复用和流程的共享，提高系统集成效率，具备较强的遥感数据实时快速处理能力。     

Contract-theoretic Approach for Delay Constrained Offloading in Vehicular Edge Computing Networks

Mobile Networks and Applications - Mobile Edge Computing (MEC) is a promising solution to improve vehicular services through offloading computation to cloud servers in close proximity to mobile...