煤表面对复合助滤剂中聚丙烯酰胺的吸附规律

采用淀粉-碘化镉显色法测定复合型助滤剂中的PAM在不同变质程度、不同灰分（岩相）煤样表面的吸附量，同时测定了相应试点颗粒表面的ξ-电位，通过试验结果综合分析得到PAM在煤表面的吸附规律：在PAM用量相同的条件下，复合型助滤剂中的PAM与水溶液中的PAM在不同煤表面的吸附量相同，不受复合型助滤剂中其他成分的影响；PAM在煤表面的吸附是非化学吸附，这种吸附没有选择性；吸附PAM之后，煤表面的ξ-电位没有明显的变化，PAM的助滤作用是通过“桥联”形成絮团提高滤饼透气性实现的．     

Hydrogenation of aromatics from low temperature coal tar over novel mesoporous NiMoC/Hβ catalysts

Journal of Porous Materials - The mesopores Hβ-Tx (x?=?1, 2, 3, 4, 5) zeolites were synthesized in different crystallization time (48 h, 72 h, 120 h,...     

Generalization of a Theorem for Replacing CCIIs by CFOAs in Current-Mode Circuits

A current feedback op-amp (CFOA) has the advantage that feedback structures in current-mode circuits are more easily devised because the voltage buffer at the output of the CFOA does not load the output of the integral positive, second-generation current conveyor (CCII⁺) that constitutes part of the CFOA. In this paper, the changes on the current mode transfer function of a linear circuit composed of a subnetwork connected to a CCII⁺ are determined when the CCII⁺ is replaced by a CFOA and a feedback component is connected from the output of the CFOA to an independent node of . Two applications of the results are provided. A new theorem is then presented which generalizes the results. This theorem should be useful for the comparison, synthesis, and improvement of linear current-mode signal processing circuits.