Synthesis of highly efficient,structurally improved Li4SiO4 sorbents for high-temperature CO2 capture

Li₄SiO₄ sorbents for high-temperature CO₂ removal have drawn extensive attention owing to their potential application in carbon capture and storage (CCS). The major challenge in the application lies in the poor CO₂ capture performance under realistic conditions of low CO₂ concentrations, owing to the dense structure and poor porosity. In this work, Li₄SiO₄ sorbents were prepared with porous micromorphologies and large contact areas using a variety of organometallic Li-precursors, achieving fast CO₂ sorption kinetics, high capacity and excellent cyclic stability at a low CO₂ concentration (15?vol%). It was found that a high conversion of ~?74% was maintained for pure Li₄SiO₄ even after 100 sorption/desorption cycles. Moreover, by doping with Na₂CO₃ to reduce the CO₂ diffusion resistance, the conversion of the sorbent was further enhanced to 93.2%. The enhancement mechanism of alkali carbonate have been proven here to be ascribed to the formation of the eutectic melt of Li/Na carbonates, the existence and function of which has been confirmed in this study.     

阿姆河流域耕地变化及水土匹配特征分析

基于中亚阿姆河流域4个分区1990—2015年间土地利用变化和水资源等数据,运用耕地变化速率、洛伦兹曲线和基尼系数法以及水土资源匹配系数对阿姆河流域耕地变化和水土匹配状况进行了综合分析。结果表明:1990—2015年阿姆河流域耕地以146.74 km²/a的速度在扩张,且各时期、各分区扩张的速度不同;在不考虑咸海来水不断减少、生态持续恶化的前提下,绿洲区匹配状况属比较公平和相对合理状况;阿姆河流域水土资源空间分布存在明显的错位现象;全流域生态用水被农业用水严重挤占,阿姆河流域灌溉面积、灌溉用水量成为影响咸海水量及面积变化的重要因素,是一种不可持续的用水方式。     

边缘计算在无人值守排水泵站智慧运管平台的应用研究

广泛应用的无人值守排水泵站智慧运管平台的建设模型主要是集中式处理型,通过阐述集中式处理型平台的架构特点以及存在的不足,介绍了边缘计算型系统的架构特点、优势价值及实现策略.边缘计算型具备低传输带宽、低响应延时、降低云中心计算负荷等优势.     

一种分发车用安全信息的单跳广播协议

单跳广播是分发车用安全信息的基本方法。在车用安全信息广播中,预约信道机制和信道状态指示机制是影响安全信息及时可靠传输的关键问题。本文首先研究了现有的信道预约机制和信道状态指示机制,分析了其对于车用安全信息分发的局限性,提出了一种利用忙音预约一跳信道、指示一跳信道状态的单跳广播协议,并在OPNET网络仿真平台上,进行了仿真实验。实验结果表明,和没有预约信道、以及预约两跳信道的单跳广播协议相比,本文提出的单跳广播协议的性能稳健性较好,更适合于分发车用安全信息。     

新工科背景下安全工程专业创新型人才培养路径研究 #br#

为实现新工科背景下安全工程专业创新人才培养目标,基于对创新能力内涵的充分理解,从创新精神、创新意识和创新思维三重角度出发,充分利用“校企协同”育人优势,确定安全工程专业创新型人才培养路径,包括创新型课程体系建设、创新型多维实践平台建设、创新型师资队伍建设及多学科交叉创业活动4条路径。将创新能力培养贯穿于安全工程专业人才培养的全过程,为高校实现创新型人才培养提出建议和参考。     

输电线路直击雷特性仿真计算

以35 kV输电线路为主要研究对象,建立其输电线路雷击仿真模型,分别从避雷线、档距、接地电阻和避雷器等因素进行深入研究,分析输电线路遭受雷击的影响.     

A binary approximating method for graspable region determination of biped climbing robots

For a biped pole-climbing robot (BiPCR) with grippers, it is an essential demand to determine the target grasp configuration for climbing and transiting between poles, with the graspable region as a priori knowledge. The graspable region on the target pole is critically important for climbing path planning and motion control. To efficiently compute the graspable region for a BiPCR, we propose a novel binary approximating method in this paper. This method may also be applied to generate the three-dimensional (3-D) workspace of a manipulator with constant orientation. The grasping problem and the concept of graspable region for a BiPCR are first introduced. The binary approximating method and the corresponding algorithms are then presented to generate the graspable region. Additional constraints on a biped climbing robot with five degrees of freedom (DoFs) are presented as a supplement to the algorithm. A series of comprehensive simulations are conducted with the five-DoF and six-DoF climbing robots to verify the effectiveness of the proposed method. Finally, the dexterity of biped climbing robots with different DoFs is discussed.     

Preparation of Narrow or Monodisperse Polymer Microspheres with Cyano Group by Distillation-Precipitation Polymerization

Summary Narrow- or monodisperse poly(divinylbenzene-co-acrylonitrile) (poly(DVB-co-AN)) microspheres with reactive cyano group were prepared by distillation-precipitation polymerization of divinylbenzene (DVB) and acrylonitrile (AN) in neat acetonitrile with 2,2′-azobis(isobutyronitrile) (AIBN) as initiator in the absence of any stabilizer or additive without stirring. The effects of the comonomer feed on the morphology and the size of poly(DVB-co-AN) microspheres were investigated. All the polymer microspheres were characterized with scanning electron microscopy and FT-IR spectra.     

基于红外图像的铜电解短路检测

本文采取了红外图像特征提取的方法检测铜电解生产系统中阴阳极板间的短路.首先采集烧板和非烧板的样本;然后在局部二值模式LBP的基础上提出差分LBP特征检测算子;最后选用支持向量机SVM分类器进行分类来提高识别率.实验表明,通过红外图像检测短路的方法可行,且改进的D-LBP特征比LBP特征及其他传统特征提取算法更适合烧板和非烧板的检测,在所选取的5000张样本中其检测正确率达到了98.5％.     

阜阳市东南部土壤地球化学特征及土壤质量评价

通过1∶250 000多目标区域地球化学调查、采样和化验,获得了阜阳市东南部地区表层、深层土壤中22项指标的土壤地球化学背景值、基准值等数据,研究其分布特征,并依据相应规范进行土壤质量评价。结果显示,与邻区(淮北-亳州)土壤基准值相比,N、Mn、I、Cr等8种元素(指标)土壤基准值略高,而P、MgO、S、Cd等8种元素(指标)则低于邻区;N、Corg和Mn土壤背景值高于邻区的土壤背景值;而P、CaO、MgO、S等8种元素(指标)土壤背景值低于邻区。土壤养分主要处于中等水平、土壤环境质量以清洁为主,仅存在少量轻微污染土壤,影响土壤环境的地球化学指标主要为Cd。区内土壤质量综合评价以优质等级为主,约占研究区总面积的76.33%;其次为良好等级,占研究区总面积的23.67%,就此提出了土地资源分质利用的建议。