Author Keywords: Water treatment; Adsorption; Heterogeneous catalysis; Hydrodechlorination; Activated carbon; Granular; Fibrous cloth; Hydrodenitrification; Glass fiber cloth 相似文献
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71.
The utilization of waste glass in concrete can cause cracking and weakening due to expansion by alkali-silica reaction (ASR). In this study, ASR expansion and properties of strength were analyzed in terms of waste glass content, glass color (brown, green), fibers (steel fiber, polypropylene fiber) and fiber content, in anticipation of reducing ASR expansion.Results showed that green waste glass was more usable than brown because its expansion was less than that of brown glass. Using the accelerated ASTM C 1260 test of waste glass, no pessimum content was found. Furthermore, when fibers and waste glass were combined, there was an effect on the reduction of expansion and strength loss due to ASR between the alkali in the cement paste and the silica in the waste glass. In particular, adding 1.5 vol.% of steel fiber to concrete containing 20% waste glass reduced the expansion ratio by 40% and increased flexural strength by up to 110%, a vast improvement when compared with using only waste glass (80 °C H2O curing) by itself. 相似文献
72.
在基体树脂中添加触变剂白炭黑,制成了S-94触变性不饱和聚酯树脂。该树脂的触变指数比基体树脂高3倍多,改善了不饱和聚酯树脂的流变性。 相似文献
73.
The transcrystal plays an important role in the enhancement of mechanical and thermal performances for polymer/glass fiber composites. Shear has been found to be a very effective way for the formation of transcrystal. Our purpose of this study was to explore the possibility to obtain the transcrystal in real processing such as injection molding. We will report our recent efforts on exploring the development of microstructure of polypropylene (PP)/glass fiber composite from skin to core in the injection-molded bars obtained by so-called dynamic packing injection molding which imposed oscillatory shear on the melt during solidification stage. A clear-cut shear-facilitated transcrystallization of PP on glass fibers was observed in the injection-molding bar for the first time. We suggested that shear could facilitate the transcrystalline growth through significantly improving the fiber orientation and the interfacial adhesion between fiber and matrix. 相似文献
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介绍了适用于高容量、小型化硬盘用基板的各种微晶玻璃材料,简要讨论了各种微晶玻璃的化学组成、显微结构、主晶相种类以及各种微晶玻璃的特性,并对今后的发展趋势进行了展望。 相似文献
76.
Adeniyi Lawal Dilhan M. Kalyon Ulku Yilmazer 《Chemical Engineering Communications》1993,122(1):127-150
The simplest model flow which approximates the extrusion (shallow screw channels) and lubrication flow is the steady, laminar flow occurring between two infinitely long parallel plates i.e., the generalized plane Couette flow. Here we develop an analytical model of the generalized plane Couette flow of viscoplastic fluids. The deformation and flow behavior of viscoplastic fluids can be realistically represented with the Herschel-Bulkley constitutive equation, which we have utilized as the basis for the development of our analytical model. Furthermore, as also demonstrated here, the deformation behavior of viscoplastic fluids is generally complicated by the presence of wall slip at solid walls, which occurs as a function of the wall shear stress. The wall slip versus the wall shear stress behavior of viscoplastic fluids can be experimentally characterized using viscomelric flows, including steady torsional and capillary flows. Thus determined Navier's wall slip coefficient can then be utilized in modeling of processing flows. In our analytical model of the generalized plane Couette flow of viscoplastic fluids the Navier's wall slip boundary condition was included. This model should be an important engineering tool, which provides design expressions for the extrusion and lubrication flows of viscoplastic fluids, with or without wall slip occurring at the walls. @KEYWORDS:Extrusion, lubrication, flow, viscoplastic, slip. 相似文献
77.
G.?BiresawEmail author A.?Adhvaryu S.?Z.?Erhan C.?J.?Carriere 《Journal of the American Oil Chemists' Society》2002,79(1):53-58
The steel/steel boundary friction properties of soybean oil (SBO) and high-oleic soybean oil (HOSBO) are compared. HOSBO is
significantly more saturated than SBO and more oxidatively stable. Changes in degree of unsaturation affect lateral interactions
of adsorbate molecules, which in turn affects their adsorption and, hence, their boundary lubrication properties. To investigate
this possibility, the free energies of adsorption (ΔG
ads) of SBO, HOSBO, and methyl laurate (ML) were determined from the analysis of friction-derived adsorption isotherms using
the Langmuir and Temkin adsorption models. The results showed a stronger adsorption for the vegetable oils than for ML, an
indication of multiple interactions between the ester groups of the triglycerides and the steel surface. The result also showed
no difference in the ΔG
ads values of SBO and HOSBO obtained using either the Langmuir or Temkin models. This was interpreted as an indication of the
lack of appreciable net lateral interaction between triglyceride adsorbates. 相似文献
78.
Opportunities and problems in application of catalytic hydrotreating processes, which are presented a viable approach in the abatement of water pollutants, are discussed. Analysis of the hydrodechlorination (HDC) and hydrodenitrification (HDN) using Pd-based catalysts supported on various materials like granulated activated carbon (GAC), fibrous activated carbon cloths (ACCs) or glass fiber cloths (GFCs) studied recently in our laboratory suggests the following perspectives:
Exhaustive regeneration of Pd/GAC saturated with p-chlorophenol can be achieved in a two-step approach, incorporating gas-phase HDC by hydrogen followed by oxidation by air.
Pd/ACC catalysts are good candidates for the liquid-phase HDC showing activity higher than that of Pd/GAC or Pd/GFC; the high adsorption capacity of Pd/ACC lead suggesting its use in a technology with periodic adsorption and HDC, in similarity to adsorption with regeneration of GAC.
Pd/GFC and Pd–Cu/GFC are promising catalyst for removal of nitrites and nitrates, showing activity and selectivity that compares favorably with those of powdered catalysts.
79.
80.
以硬质粘土粉(w(Al2O3)>38%,粒度为0.002~0.11mm)和钾长石粉(w(K2O Na2O)=13.13%,粒度为0.005~0.11mm)为原料,配制成钾长石粉加入量分别为0、3.76%、5.30%和6.84%的试料(对应的w(K2O Na2O)分别为0.11%、0.6%、0.8%和1.0%),湿磨2h,烘干后以150MPa压力压制成20mm×10mm的试样,然后在1500~1600℃煅烧3h。对煅烧后试样进行了物理性能检测、物相分析和显微结构分析,以研究钾长石含量对粘土烧结的影响。结果表明:钾长石粉加入前后试样的烧结温度分别为1550℃和1500℃;加入钾长石能消除粘土原料煅烧过程中形成的方石英相,使烧成试样中只出现莫来石晶相;加入3.76%~6.84%钾长石粉的试样中莫来石含量达61%~66%,并且莫来石发育较好,呈针状,长度达8μm,直径约0.5μm。 相似文献