烧结砖一次与二次码烧工艺的选择

1 烧结砖生产工艺过程 烧结砖生产工艺过程总的来讲有原料的制备、坯体成型、湿坯干燥和成品焙烧四部分组成.制砖原料经采掘之后,有的原料经加水搅拌和碾练设备处理就可以了,有的原料就不行.如山土、煤矸石和页岩等原料,还要经过破碎和细碎之后再加水搅拌和碾练才行.原料选择和制备的好坏直接影响到成品砖的质量好坏.所以常言说原料是制烧结砖的根本.这说明原料与原料制备的重要性.     

低渗透油藏压裂改造技术的研究与应用

近年来,储层压裂改造技术,在低渗透油藏的高效开发应用中,收到较好的增产效果。桥66块属于复杂断块低孔低渗透油藏,主要含油层系为沙三上和沙三中,油井投产后大多低产低能,通过压裂改造,改善其油层物性和渗透条件,提高储层导流能力,是解决该区块低产低能的主要途径,是增加该区块产能的一种最有效的增产措施。     

Poly(N-isopropylacrylamide), poly(methacrylic acid) and their copolymers for oral colon-specific drug delivery

A series of cross-linked gels of Poly(N-isopropylacrylamide) [P(NIPAAm)] and Poly(methacr-ylic acid)[P(MAA)] homopolymers and P(NIPAAm-co-MAA) random copolymers were synthesized based on NIPAAm and MAA using 4,4-Bis-(methacryloylamino) azobenzene (BMAAB) as a cross-linker. The swelling behavior of these hydrogels in different pH buffer solutions was studied. The influential factors of the gels including composition of NIPAAm and MAA, pH and temperature upon swelling behavior were investigated. The obtained gels not only hold pH and thermometrical sensitivity, but also take on enzymatic sensitivity due to the cross-linker could be degraded by enzymes of colon. Swelling equilibrium degree of copolymers was very low in acidic medium, which could avoid drug releasing due to biggish swelling of carrier in stomach. Hydrogels would partly swell owing to higher pH value in small intestine. When arrived in colon, hydrogels completely swelled, meanwhile, azoenzymes located would degrade azo-bonds of polymeric network and then drug released in colon.     

环氧厚浆封闭在老闸加固工程中的应用探讨

环氧厚浆涂料是一种银灰色的高效防腐、防锈涂料,通过对黄墩湖滞洪区调整与建设工程新邳洪河闸加固混凝土表面封闭性涂层防护环氧厚浆施工及其效果分析,结果表明环氧厚浆封闭是提高混凝土耐久性所采取的较好的附加措施。     

应用因素分析和调整技术提高系统效率

机采系统效率是评价机采系统用能水平的重要指标,也是反映采油用能水平的重要指标。提高机采系统效率是油田降本增效的重要途径,本文从地面、地下、管理三个方面系统分析影响机采系统的因素,并提出了提高机采系统效率的对策。     

多媒体技术——架设在中学英语教学中的桥梁

随着科学技术的发展,传统的思维方式、思想观念正受到巨大的冲击.多媒体辅助教学已由优质课、示范课上的"表演"向实施素质教育的主阵地迈进.     

双模压滤式生产水泥彩瓦

彩色水泥屋面瓦是一种符合国家环保政策、保护国土资源和生态环境的新型墙体屋面材料.彩色水泥瓦不但具有很好的外观装饰效果,而且还具有抗风、抗冻、防水等性能.