以二乙醇胺(DEA)、丙烯酸甲酯(MA)、1,1,1-三羟甲基丙烷(TMP)、顺丁烯二酸酐(MAH)为原料,合成了一种端羧基超支化大单体HPAE-C。并以HPAE-C、丙烯酰胺(AM)、丙烯酸(AA)以及2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为单体,在水溶液中进行自由基...以二乙醇胺(DEA)、丙烯酸甲酯(MA)、1,1,1-三羟甲基丙烷(TMP)、顺丁烯二酸酐(MAH)为原料,合成了一种端羧基超支化大单体HPAE-C。并以HPAE-C、丙烯酰胺(AM)、丙烯酸(AA)以及2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为单体,在水溶液中进行自由基聚合得到一种四元共聚物稠化剂PHPAE-C。通过FTIR和^(1)HNMR对其结构进行表征。评价了超支化稠化剂的溶液性质和交联性能。结果表明,稠化剂质量浓度为3000 mg/L(剪切速率为7.34 s^(–1),25℃)时,溶液表观黏度可达846.7 m Pa·s,升温至90℃时,表观黏度仍为570 m Pa·s,并且在Na^(+)质量浓度为6000 mg/L、Ca^(2+)和Mg^(2+)质量浓度为600 mg/L时,表观黏度仍能达到300 m Pa·s以上,说明PHPAE-C具有良好的增黏、耐温、耐盐和抗剪切性能;在m(聚合物水溶液,聚合物质量分数为0.3%)∶m(乙酰丙酮锆)=100∶0.06、交联温度为55℃、pH=5时,交联效果最佳。在120℃、剪切速率170 s^(–1)下剪切80 min后,该体系的表观黏度可达到450 m Pa·s左右,并且是一种具有良好悬砂、破胶性能的低伤害压裂液体系。展开更多
In recent years, web technology carried on growing and at same time, the number of internet users increased significantly in number. Today, a Web server is capable of processing millions of requests per day, but durin...In recent years, web technology carried on growing and at same time, the number of internet users increased significantly in number. Today, a Web server is capable of processing millions of requests per day, but during the peak period may collapse and becomes critical causing unavailability of the services offered by the servers. That is why Web server performance is a topic of great interest to many researchers. In this paper, we evaluate experimentally the impact of JSP and PHP dynamic content technology: JSP and PHP with access to a database of performance data of Apache Web server. Using the “ApacheBench” performance measurement tool, the approach is to compare the performances of four different configurations of a Web server, such as: Apache Web server implementing JSP technology with access to PostgreSQL database, Apache using PHP technology with the PostgreSQL as database, Apache Web server using the JSP technology with access to MySQL database, finally Apache and PHP with DBMS MySQL. At the end of this article, we also present a Simulink model of Web server performance based on the simple M/M/1 queue. During the modeling, the MATLAB software was used.展开更多
文摘以二乙醇胺(DEA)、丙烯酸甲酯(MA)、1,1,1-三羟甲基丙烷(TMP)、顺丁烯二酸酐(MAH)为原料,合成了一种端羧基超支化大单体HPAE-C。并以HPAE-C、丙烯酰胺(AM)、丙烯酸(AA)以及2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为单体,在水溶液中进行自由基聚合得到一种四元共聚物稠化剂PHPAE-C。通过FTIR和^(1)HNMR对其结构进行表征。评价了超支化稠化剂的溶液性质和交联性能。结果表明,稠化剂质量浓度为3000 mg/L(剪切速率为7.34 s^(–1),25℃)时,溶液表观黏度可达846.7 m Pa·s,升温至90℃时,表观黏度仍为570 m Pa·s,并且在Na^(+)质量浓度为6000 mg/L、Ca^(2+)和Mg^(2+)质量浓度为600 mg/L时,表观黏度仍能达到300 m Pa·s以上,说明PHPAE-C具有良好的增黏、耐温、耐盐和抗剪切性能;在m(聚合物水溶液,聚合物质量分数为0.3%)∶m(乙酰丙酮锆)=100∶0.06、交联温度为55℃、pH=5时,交联效果最佳。在120℃、剪切速率170 s^(–1)下剪切80 min后,该体系的表观黏度可达到450 m Pa·s左右,并且是一种具有良好悬砂、破胶性能的低伤害压裂液体系。
文摘In recent years, web technology carried on growing and at same time, the number of internet users increased significantly in number. Today, a Web server is capable of processing millions of requests per day, but during the peak period may collapse and becomes critical causing unavailability of the services offered by the servers. That is why Web server performance is a topic of great interest to many researchers. In this paper, we evaluate experimentally the impact of JSP and PHP dynamic content technology: JSP and PHP with access to a database of performance data of Apache Web server. Using the “ApacheBench” performance measurement tool, the approach is to compare the performances of four different configurations of a Web server, such as: Apache Web server implementing JSP technology with access to PostgreSQL database, Apache using PHP technology with the PostgreSQL as database, Apache Web server using the JSP technology with access to MySQL database, finally Apache and PHP with DBMS MySQL. At the end of this article, we also present a Simulink model of Web server performance based on the simple M/M/1 queue. During the modeling, the MATLAB software was used.
