AIM:To investigate the frequency and factors of prolonged QT dispersion that may lead to severe ventricular arrhythmias in patients with inflammatory bowel disease(IBD).METHODS:This study included 63 ulcerative coliti...AIM:To investigate the frequency and factors of prolonged QT dispersion that may lead to severe ventricular arrhythmias in patients with inflammatory bowel disease(IBD).METHODS:This study included 63 ulcerative colitis(UC) and 41 Crohn's disease(CD) patients.Forty-seven healthy patients were included as the control group.Heart rate was calculated using electrocardiography,corrected QT dispersion(QTcd) and the Bazett's formula.Homeostasis model assessment(HOMA) was used to determine insulin resistance(IR).HOMA values < 1 were considered normal and values > 2.5 indicated a high probability of IR.RESULTS:Prolonged QTcd was found in 12.2% of UC patients,and in 14.5% of CD patients compared with the control group(P < 0.05).A significant difference was found between the insulin values(CD:10.95 ± 6.10 vs 6.44 ± 3.28,P < 0.05;UC:10.88 ± 7.19 vs 7.20 ± 4.54,P < 0.05) and HOMA(CD:2.56 ± 1.43 vs 1.42 ± 0.75,P < 0.05;UC:2.94 ± 1.88 vs 1.90 ± 1.09,P < 0.05) in UC and CD patients with and without prolonged QTcd.Disease behavior types were determined in CD patients with prolonged QTcd.Increased systolic arterial pressure(125 ± 13.81 vs 114.09 ± 8.73,P < 0.01) and age(48.67 ± 13.93 vs 39.57 ± 11.58,P < 0.05) in UC patients were significantly associated with prolonged QTcd.CONCLUSION:Our data show that IBD patients have prolonged QTcd in relation to controls.The routine followup of IBD patients should include determination of HOMA,insulin values and electrocardiogram examination.展开更多
随着互联网技术的发展及各式商用信息产品的普及,专用业务信息系统用户的需求和使用习惯的变化更加频繁,传统C/S架构的专用业务信息系统不能很好地满足新的市场变化的需求。针对这一现状,本文使用HTML5、node.js、Qt Web Engine、Thrif...随着互联网技术的发展及各式商用信息产品的普及,专用业务信息系统用户的需求和使用习惯的变化更加频繁,传统C/S架构的专用业务信息系统不能很好地满足新的市场变化的需求。针对这一现状,本文使用HTML5、node.js、Qt Web Engine、Thrift等一系列新的技术,并吸取B/S架构的优势,提出了一种B/S+C/S混合模式系统架构,采用了服务化和分布式的思想,使得系统既具备了C/S模式强大的数据操作和事务处理能力,又兼容了B/S模式便捷的维护升级以及良好的用户体验特性,能够对用户的新需求进行快速响应。展开更多
The as-cast QT700-6 alloy was synthesized with addition of a certain amount of copper, nickel, niobium and stannum elements by alloying method in a medium frequency induction furnace, aiming at improving its strength ...The as-cast QT700-6 alloy was synthesized with addition of a certain amount of copper, nickel, niobium and stannum elements by alloying method in a medium frequency induction furnace, aiming at improving its strength and toughness. Microstructures of the as-cast QT700-6 alloy were observed using a scanning-electron microscope （SEM） and the mechanical properties were investigated using a universal tensile test machine. Results indicate that the ratio of pearlite/ferrite is about 9：1 and the graphite size is less than 40 tJm in diameter in the as-cast QT700-6 alloy. The predominant refinement mechanism is attributed to the formation of niobium carbides, which increases the heterogeneous nucleus and hinders the growth of graphite. Meanwhile, niobium carbides also exist around the grain boundaries, which improve the strength of the ductile iron. The tensile strength and elongation of the as-cast QT700-6 alloy reach over 700 MPa and 6%, respectively, when the addition amount of niobium is 0.8%. The addition of copper and nickel elements contributed to the decrease of eutectoid transformation temperature, resulting in the decrease of pearlite lamellar spacing （about 248 rim）, which is also beneficial to enhancing the tensile strength. The main fracture mechanism is cleavage fracture with the appearance of a small amount of dimples.展开更多
利用Qt on Android平台设计出了一种针对空气质量监测系统的Android手机客户端,该客户端实现了手机与服务器的信息交互,使得用户可以通过手机方便快捷的查询选定监测端当前的空气质量数据,实现了室内环境监测的网络化。同时为C/C++程序...利用Qt on Android平台设计出了一种针对空气质量监测系统的Android手机客户端,该客户端实现了手机与服务器的信息交互,使得用户可以通过手机方便快捷的查询选定监测端当前的空气质量数据,实现了室内环境监测的网络化。同时为C/C++程序员在Android平台开发APP提供了范例。展开更多
文摘AIM:To investigate the frequency and factors of prolonged QT dispersion that may lead to severe ventricular arrhythmias in patients with inflammatory bowel disease(IBD).METHODS:This study included 63 ulcerative colitis(UC) and 41 Crohn's disease(CD) patients.Forty-seven healthy patients were included as the control group.Heart rate was calculated using electrocardiography,corrected QT dispersion(QTcd) and the Bazett's formula.Homeostasis model assessment(HOMA) was used to determine insulin resistance(IR).HOMA values < 1 were considered normal and values > 2.5 indicated a high probability of IR.RESULTS:Prolonged QTcd was found in 12.2% of UC patients,and in 14.5% of CD patients compared with the control group(P < 0.05).A significant difference was found between the insulin values(CD:10.95 ± 6.10 vs 6.44 ± 3.28,P < 0.05;UC:10.88 ± 7.19 vs 7.20 ± 4.54,P < 0.05) and HOMA(CD:2.56 ± 1.43 vs 1.42 ± 0.75,P < 0.05;UC:2.94 ± 1.88 vs 1.90 ± 1.09,P < 0.05) in UC and CD patients with and without prolonged QTcd.Disease behavior types were determined in CD patients with prolonged QTcd.Increased systolic arterial pressure(125 ± 13.81 vs 114.09 ± 8.73,P < 0.01) and age(48.67 ± 13.93 vs 39.57 ± 11.58,P < 0.05) in UC patients were significantly associated with prolonged QTcd.CONCLUSION:Our data show that IBD patients have prolonged QTcd in relation to controls.The routine followup of IBD patients should include determination of HOMA,insulin values and electrocardiogram examination.
文摘随着互联网技术的发展及各式商用信息产品的普及,专用业务信息系统用户的需求和使用习惯的变化更加频繁,传统C/S架构的专用业务信息系统不能很好地满足新的市场变化的需求。针对这一现状,本文使用HTML5、node.js、Qt Web Engine、Thrift等一系列新的技术,并吸取B/S架构的优势,提出了一种B/S+C/S混合模式系统架构,采用了服务化和分布式的思想,使得系统既具备了C/S模式强大的数据操作和事务处理能力,又兼容了B/S模式便捷的维护升级以及良好的用户体验特性,能够对用户的新需求进行快速响应。
基金financially supported by the Program for Innovative Research Team in University of Liaoning Province(grant no.LT2015020)the National Natural Science Foundation of China(grant nos.51274142 and 51401130)
文摘The as-cast QT700-6 alloy was synthesized with addition of a certain amount of copper, nickel, niobium and stannum elements by alloying method in a medium frequency induction furnace, aiming at improving its strength and toughness. Microstructures of the as-cast QT700-6 alloy were observed using a scanning-electron microscope （SEM） and the mechanical properties were investigated using a universal tensile test machine. Results indicate that the ratio of pearlite/ferrite is about 9：1 and the graphite size is less than 40 tJm in diameter in the as-cast QT700-6 alloy. The predominant refinement mechanism is attributed to the formation of niobium carbides, which increases the heterogeneous nucleus and hinders the growth of graphite. Meanwhile, niobium carbides also exist around the grain boundaries, which improve the strength of the ductile iron. The tensile strength and elongation of the as-cast QT700-6 alloy reach over 700 MPa and 6%, respectively, when the addition amount of niobium is 0.8%. The addition of copper and nickel elements contributed to the decrease of eutectoid transformation temperature, resulting in the decrease of pearlite lamellar spacing （about 248 rim）, which is also beneficial to enhancing the tensile strength. The main fracture mechanism is cleavage fracture with the appearance of a small amount of dimples.
