钙镁复合药剂处理洗煤废水的效果及作用机理研究

用CaCl2与MgS04复配出新的复合药剂,通过试验确定了适宜m(CaCl2):m(MgSO4)=1:1.采用正交实验确定了钙镁复合药剂与PAM联用处理洗煤废水的最佳组合条件,并通过生产性试验验证了实验室的试验结果.分析认为钙镁复合药剂对洗煤废水的混凝机理并不完全符合DLVO理论,它是多方面因素共同作用的结果.     

谈采样频率在实践中的应用

大家知道,采样频率是数字音频技术中的一个重要概念．它表示模数转换时每秒钟抽取样值的个数。采样频率越高．其模拟原值的精度越高．保真度也就越高。当然．采样频率越高,AD转换时所需空间越大,硬件的投入也就越高。因此．只有在条件允许的情况下．采样频率越高越好。     

Metal-organic framework-based CO2 capture: from precise material design to high-efficiency membranes

A low-carbon economy calls for CO₂ capture technologies. Membrane separations represent an energy-efficient and environment-friendly process compared with distillations and solvent absorptions. Metal-organic frameworks (MOFs), as a novel type of porous materials, are being generated at a rapid and growing pace, which provide more opportunities for high-efficiency CO₂ capture. In this review, we illustrate a conceptional framework from material design and membrane separation application for CO₂ capture, and emphasize two importance themes, namely (i) design and modification of CO₂-philic MOF materials that targets secondary building units, pore structure, topology and hybridization and (ii) construction of crack-free membranes through chemical epitaxy growth of active building blocks, interfacial assembly, ultrathin two-dimensional nanosheet assembly and mixed-matrix integration strategies, which would give rise to the most promising membrane performances for CO₂ capture, and be expected to overcome the bottleneck of permeability-selectivity limitations.     

包钢U76CrRE钢轨生命周期评价

通过对包钢生产的U76CrRE钢轨进行生命周期评价(LCA)研究,计算得到该产品的LCA结果,分析了该产品环境影响因素在各阶段的分布情况,进一步分析了各生产工序的能耗情况和外购产品碳排放的构成情况,研究结果为U76CrRE钢轨的生态设计和绿色制造提供了科学的数据支撑。     

大豆蛋白水解液脱苦的研究

大豆蛋白酶解常常会产生苦味,蛋白质水解物苦味肽的苦味是长期困扰其应用的问题。本文研究了酶法与微生物法对大豆蛋白水解液脱苦的效果。结果表明:采用端肽酶黑曲霉酸性蛋白酶(3000u/g)与内切酶枯草杆菌碱性蛋白酶(Alcalase 2.4L)协同作用水解大豆蛋白可有效降低水解液苦味,并且由酿酒酵母对水解液进一步处理后,大豆蛋白水解液的苦味降至更低。     

朝鲜蓟副产物超微粉强化茶饮料的功能性成分研究

以抹茶奶茶为对照,添加15％的朝鲜蓟茎叶副产物超微粉开发营养强化奶茶,并分析其功能性成分组成及含量.采用高效液相色谱-三重四极杆串联质谱技术(HPLC-QqQ-MS/MS)和气相色谱-质谱联用技术(GC-MS)分别对奶茶中的功能多酚和萜类化合物进行定性与定量分析.结果表明,添加朝鲜蓟茎叶副产物超微粉后,显著增加了奶茶中...     

Fundamentals of electrosorption on activated carbon for wastewater treatment of industrial effluents

The potential of electroadsorption/desorption on activated carbon for waste water treatment of industrial effluents is studied. Adsorption isotherms of hydrophobic differently charged model substances on activated carbon were measured in order to obtain specific information about the influence of the charge (+1,–1 and 0) on the adsorbability of comparable, aromatic species and the influence of the bed potential on the adsorption equilibria. In all these cases the adsorption equilibria show a dependence on applied potential in electrolyte of approximately 1m ionic strength. With electrosorption from aqueous solution, a fivefold enhancement of the concentration in one potential controlled adsorption/desorption cycle is achievable. The use of the solvent methanol instead of water for desorption allows for a concentration enhancement by a factor of hundred in the desorptive step. The adsorption capacity of the activated carbon changes only slightly with cycle number. Two cell designs for the performance of potential controlled adsorption/desorption cycles on the large scale are discussed.     

增韧剂及成核剂对PP–R复合材料性能的影响

采用注射成型法制备无规共聚聚丙烯(PP–R)复合材料,结合差示扫描量热仪、扫描电子显微镜、X射线衍射仪及偏光显微镜等技术,分析了乙烯–辛烯共聚物+高密度聚乙烯增韧剂及WBGⅡ型β成核剂对PP–R复合材料力学性能和结晶行为的影响。结果表明,增韧剂与成核剂对复合材料的综合性能有明显的影响,β成核剂和增韧剂同时加入到PP–R材料中,协效提高了复合材料的冲击强度,为78.7 k J/m~2,与纯PP–R材料比较提高了175%,而对拉伸及弯曲强度影响较小。同时,加入增韧剂及成核剂均能诱导α晶向β晶转变,晶粒细化,进而改善其冲击韧性。     

Impact toughened blends of styrene-maleic anhydride copolymer,polyethylene, and ethylene-propylene copolymer

Impact-toughened, compatibilized binary blends of styrene-maleic anhydride (SMA) copolymer/amine functionalized ethylene-propylene (amine-EP) polymer and ternary blends consisting of SMA/amine-EP/high density polyethylene (HDPE) are described. In both blends 0.02 to 4 μm range rubbery inclusions, which toughen the SMA matrix, are formed. SMA sub-inclusions exist in the amine-EP phase. In the ternary blend substantially all of the polyethylene is embedded in the EP phase. Compatibilization of the SMA and the commingled polyolefin phase is promoted by a graft copolymer formed by the reaction of amine groups on the EP with the maleic anhydride groups on the SMA. We describe the morphology, rheology, aging characteristics and impact properties of these blends. SMA modification by SMA-g-(amine-EP) polymers formed in situ in the melt, with HDPE, has not been previously reported.     

AgSnO2电接触材料熔桥行为的高速摄像研究

本研究以AgSnO₂电接触材料为研究对象,借助高速摄像技术并与电接触试验机组成电接触-高速摄像试验体系,观测电触头对在不同负载条件下熔桥行为的基本特征和规律,并进行定量测量研究,同时通过扫描电镜(SEM)和能谱分析(EDS)对熔桥行为后触头表面的微观结构和元素分布进行分析。结果表明,AgSnO₂触头熔桥演化行为可分为接触区域熔化、熔桥稳定存在和熔桥失稳及断开三个阶段,熔桥和电弧现象可以同时存在,并且存在一定的协同和竞争关系,AgSnO₂触头材料的熔桥尺寸为微米级(0.027-0.295 mm),熔桥直径随电流的增大而增大,熔桥长度随电流的增大而减小,熔桥演化行为过程中熔桥形状依次表现为墩粗型、圆柱型和哑铃型,熔桥行为会改变触头的表面形貌和元素分布。