N,N-二甲基乙醇胺与间苯二甲酰氯反应获得二(N,N-二甲基胺基乙基)间苯二甲酸酯,再分别与溴代正十二烷和溴代正十六烷制得两种含酯基Gemini阳离子表面活性剂(C12-O-C12、C16-O-C16)。采用IR、1 H NMR、元素分析表征了其结构。测定了其临...N,N-二甲基乙醇胺与间苯二甲酰氯反应获得二(N,N-二甲基胺基乙基)间苯二甲酸酯,再分别与溴代正十二烷和溴代正十六烷制得两种含酯基Gemini阳离子表面活性剂(C12-O-C12、C16-O-C16)。采用IR、1 H NMR、元素分析表征了其结构。测定了其临界胶束浓度(CMC)分别为6.91×10-4 mol/L、7.07×10-5 mol/L;平衡表面张力(γCMC)分别为41.9 mN/m、40.8 mN/m;Krafft点分别为<0℃、43℃。并研究了其乳化性、泡沫性质等。展开更多
For the integration network of a cellular network and a wireless local area network （WLAN）, a priority-based dynamic load transfer （PDLT） algorithm is proposed. The dynamic vertical handoffs by call admission cont...For the integration network of a cellular network and a wireless local area network （WLAN）, a priority-based dynamic load transfer （PDLT） algorithm is proposed. The dynamic vertical handoffs by call admission control are jointly determined by the network conditions and the traffic characteristics in combination with the location-condition of mobile terminals. When there is no bandwidth resource available in the cellular network or WLAN, the proposed PDLT algorithm allows an incoming voice call or data call within the overlapping area of the cellular network and the WLAN to be directed to the spare network; meanwhile, by dynamically computing the occupancy of the bandwidth resource, the proposed PDLT algorithm also allows an ongoing voice call or data communication to be transferred to the network with a sufficient bandwidth resource according to the given threshold to balance the number of voice/data calls in the two networks. The analysis results of a two-dimensional Markov model and the simulation results show that the PDLT algorithm can effectively enhance the whole integrated network＇ s traffic, reduce the blocking probability of new calls and increase the data throughput, and thus decrease the response time for various services.展开更多
N,N-二甲基-1,3-丙二胺(1)与丙烯酸甲酯经Michael加成反应制得N,N-二甲基-N'-甲氧酰丙基-1,3-丙二胺(2);2经胺基保护、季铵盐化及水解反应合成了一种新型的甜菜碱两性表面活性剂(6),其结构经1H NMR,IR和ESI-MS表征。通过电导率法测...N,N-二甲基-1,3-丙二胺(1)与丙烯酸甲酯经Michael加成反应制得N,N-二甲基-N'-甲氧酰丙基-1,3-丙二胺(2);2经胺基保护、季铵盐化及水解反应合成了一种新型的甜菜碱两性表面活性剂(6),其结构经1H NMR,IR和ESI-MS表征。通过电导率法测得6的CMC为1.48×10-4mol·L-1,滴体积法测得γCMC为39.99 m N·m-1,Krafft点小于0℃。乳化与泡沫性能研究结果表明:6具有较好的表面活性,且乳化性和泡沫性能优良。展开更多
基金The National Science and Technology Major Project(No. 2011ZX03005-004-03 )the National Natural Science Foundation of China (No. 61171081 )the Research Fund of the National Mobile Communications Research Laboratory of Southeast University (No.2011A08)
文摘For the integration network of a cellular network and a wireless local area network （WLAN）, a priority-based dynamic load transfer （PDLT） algorithm is proposed. The dynamic vertical handoffs by call admission control are jointly determined by the network conditions and the traffic characteristics in combination with the location-condition of mobile terminals. When there is no bandwidth resource available in the cellular network or WLAN, the proposed PDLT algorithm allows an incoming voice call or data call within the overlapping area of the cellular network and the WLAN to be directed to the spare network; meanwhile, by dynamically computing the occupancy of the bandwidth resource, the proposed PDLT algorithm also allows an ongoing voice call or data communication to be transferred to the network with a sufficient bandwidth resource according to the given threshold to balance the number of voice/data calls in the two networks. The analysis results of a two-dimensional Markov model and the simulation results show that the PDLT algorithm can effectively enhance the whole integrated network＇ s traffic, reduce the blocking probability of new calls and increase the data throughput, and thus decrease the response time for various services.
文摘以氯苄和对二苯酚为原料,合成4-苄氧基苯酚,再分别与溴代十二烷、溴代十四烷、溴代十六烷反应,最后经氯磺酸磺化,制备三种烷氧二苯磺酸型表面活性剂(命名为C-12、C-14、C-16)。采用IR、1H NMR表征了结构,并测定其临界胶束浓度(CMC)分别为3.35×10-3,9.10×10-4,7.40×10-4mo L/L;表面张力(γCMC)分别为55.45,52.10,49.28 m N/m;Krafft点均<0℃,研究了其乳化性、泡沫性质。
文摘N,N-二甲基-1,3-丙二胺(1)与丙烯酸甲酯经Michael加成反应制得N,N-二甲基-N'-甲氧酰丙基-1,3-丙二胺(2);2经胺基保护、季铵盐化及水解反应合成了一种新型的甜菜碱两性表面活性剂(6),其结构经1H NMR,IR和ESI-MS表征。通过电导率法测得6的CMC为1.48×10-4mol·L-1,滴体积法测得γCMC为39.99 m N·m-1,Krafft点小于0℃。乳化与泡沫性能研究结果表明:6具有较好的表面活性,且乳化性和泡沫性能优良。
