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煤基高性能炭素材料普遍具有稳定性号、耐腐蚀、绝缘等性能特点,有助于建筑工程质量的提高.结合常见的煤基高性能炭素材料性能,并对其在建筑工程中的应用进行深入分析. 相似文献
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以表面具有螯合官能团的高分子材料-Po ly(BA-co-GM A-IDA)为高分子液体模板制备了Z rO2功能性溶胶复合薄膜。含Z rO2功能性混合溶胶薄膜在全棉类面料上表现出明显的隔热效果,对蓝、绿、红、白色布料降温可达2~5℃,对黑色布料的降温效果更高达8℃左右。在制备具有抗紫外、近红外功能的凉爽型纤维及织物方面具有良好的市场前景。 相似文献
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近年来,功能性高分子材料的研究异常活跃,其方法之一是将两种或两种以上不同性能的聚合物为组成成分合成新的高分子材料。具有不同性能高分子材料的复合,可得到一般高分子材料所不具备的性能。乳液聚合是复合高分子材料的方法之一。复合技术不仅与聚合物的分子设计有关,而且与聚合物的粒子设计有关。本文拟对丙烯酸复合乳液的技术动向进行初浅的介绍。 1~+复合离分子乳液的分类和粒子构造 1.1以水分散体为种子的乳液 (1)利用丙烯酸分散体形成真球形粒子(高分子量成分/低分子量成 相似文献
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《Planning》2015,(25)
以就业为导向,紧紧围绕"提升就业能力"这一中心,从实验课程体系、实训基地、实习、毕业论文选题和师资队伍五个基本要点进行了探讨,构建出一套适合高分子材料专业发展的"1+5"型实践教学模式。此实践教学模式的运行,有望促进高分子材料专业学生的就业及提高就业质量。 相似文献
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《Planning》2015,(3):364-368
采用冷凝回流的方法处理活性炭材料,讨论了硫酸与硝酸不同体积比(2:1、1:1、1:2、1:3)处理的活性炭材料对VO2+/VO2+电化学活性的影响.傅里叶变换红外测试表明,通过混酸处理,活性炭材料上只接入了羟基.比表面积仪和循环伏安分别检测了处理前后样品的表面特性及电化学性能.结果表明,VO2+/VO2+在处理后的碳材料上具有较大的活性,当硫酸与硝酸的体积比为1:2时,处理后的碳材料表现出最好的电化学性能,其ΔEp为154 m V,比未处理碳粉的ΔEp减少了3.3倍,氧化峰电流密度为28.24 m A·cm-2,提高了1.4倍,还原峰电流密度为19.73 m A·cm-2,提高了2.1倍. 相似文献
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分析了预应力锚索支护机理,结合具体工程,并根据淮南矿区深井高地应力等复杂地质条件,研究锚索加固技术在深井高应力煤巷中的应用,介绍了锚索加固技术的施工工艺,指出该技术是解决深井高应力巷道的一种有效途径。 相似文献
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针对管道内壁存在含硫电化学腐蚀的现状,模拟大连市煤气管道内积水环境,采用动电位极化曲线扫描法和电化学阻抗谱,研究了硫离子(S2-)对Q235B钢腐蚀行为的影响。随着S2-质量浓度的增加,Q235B钢腐蚀电位先降低后升高,腐蚀速率先增大后减小。低质量浓度的S2-对Q235B钢的腐蚀表现为点蚀。高质量浓度的S2-对Q235B钢的腐蚀表现为均匀腐蚀,其腐蚀产物膜在短期内对Q235B钢有保护作用,即在一定程度上,高质量浓度的S2-对碳素钢具有缓蚀作用。当S2-的质量浓度为20mg/L时,Q235B钢的腐蚀速率最大。在人工煤气的生产净化中,应尽可能降低煤气中的含硫量。 相似文献
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《Structure and Infrastructure Engineering》2013,9(12):1160-1172
The sandwich plate system (SPS) is a bridge deck system consisting of steel face plates bonded to a rigid polyurethane core. SPS bridges are typically constructed as a series of pre-fabricated SPS deck panels compositely connected with traditional steel girders. The decks are thin, lightweight and modular, and can be tailored to numerous applications including both new bridge and rehabilitated bridges. With new system, there exist hurdles in the implementation; for SPS, the primary challenge is the lack of an established design method for the panel cross-sections. Presented herein is a method for sizing SPS panel sections for bridge applications. This method is limited to the selection of steel plate and core dimensions, subjected to American Association of State Highway and Transportation Officials (AASHTO) limit states of serviceability, strength and fatigue and does not consider connections or bond aspects of the system. The sizing approach considers the deck panels as plates with variable boundary conditions subjected to the loading conditions of the AASHTO Load Resistance Factored Design (LRFD) bridge design specification. Results from this study indicate that the component sizing for SPS deck panels is controlled by stiffness and that plates selected to satisfy the AASHTO limiting deflection criterion will also be adequate for the remaining serviceability, strength and fatigue limit states. 相似文献
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Reaction of phenol with nitrite ion: pathways of formation of nitrophenols in environmental waters 总被引:1,自引:0,他引:1
When sodium nitrite is spiked into phenolic waters, 2-nitrophenol is produced immediately while 4-nitrophenol forms in minor yield after an induction period. The reaction occurs at ambient temperature under acidic, neutral and alkaline conditions. The reaction also occurs in the dark. The nature and yield of the products formed in the dark are analogous to that obtained under ordinary light. Results show that the formation of 2-nitrophenol is first order in nitrite, however, within a narrow range of concentrations. No such order of reaction could be determined for 4-nitrophenol, the yield of which increases in presence of excess nitrite ions and at high nitrite to phenol ratios. Results of this study indicate that NO(2)(-) is the active species in the reaction, attacking the phenol ring at the ortho position and at the same time undergoing a para-substitution in excess nitrite atmosphere. Neither any photo-induced oxidation nor any nitronium ion, NO(2)(+) formation is involved as active species in the nitration of phenol. Our study indicates that in environmental waters a simple contact of nitrite ion with phenolic wastewaters under ambient conditions may form mononitrophenols, which are toxic to aquatic species. 相似文献
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Stephen Kennedy 《Stahlbau》2007,76(7):455-464
Sandwich Plate System (SPS). SPS was initially developed to provide impact resistant plating for offshore structures, ice islands, working in the Canadian Beaufort Sea. Research and development over the last thirteen years has focused on basic research into structural behaviour and performance, material characterization, fire resistance and fire engineering analyses, as well as development of design rules and energy absorption design philosophies. In addition connection details specific to sandwich plate structures and methods for in‐situ installations (SPS Overlay), repair, prefabrication and inspection have been developed. This work summarized in this paper, clearly demonstrates that not only SPS plates can be designed to be structurally equivalent to stiffened steel plates, but that the implied economical use of SPS plates provides a number of further advantages with respect to performance and safety. 相似文献
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该工程为徐州矿务集团有限公司150万t/年甲醇项目首期60万t/年甲醇工程/煤储运系统/筒仓,共六个筒仓一字型排开,总长为155.94 m,宽为26.17 m,檐口标高为+52 m。 相似文献
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为了探索除磷的优良吸附材料和新方法,本实验对粉煤灰与PFS联用、碱改性粉煤灰处理二级出水中的磷进行了实验研究,结果表明:粉煤灰与PFS联用处理3 mg/L的含磷模拟废水去除率可达72%,两者联用可使吸附与混凝发挥协同作用,强化处理效果;而用2 mol/L的氢氧化钠碱改性粉煤灰后,当投加改性粉煤灰8 g,以30 r/min的转速搅拌5 min时,对含磷模拟废水的去除率可达90%,碱改性后,粉煤灰在发挥其吸附作用的同时,与磷酸根离子产生羟磷灰石化学沉淀,强化了除磷效果,且可实现泥水分离。比较分析上述2种方法,碱改性粉煤灰既能有效除磷又能实现泥水分离,且药剂成本较低,工艺简单,值得推广应用。 相似文献