Under the influence of extreme natural disasters and man-made cyber attacks,the electricity-gas integrated energy system(EGIES)may experience power failure and gas interruption,which have significant impacts on the na...Under the influence of extreme natural disasters and man-made cyber attacks,the electricity-gas integrated energy system(EGIES)may experience power failure and gas interruption,which have significant impacts on the national economy and social stability.This paper proposes an expansion planning strategy for the EGIES considering N-1 security constraints and restorability capacity.First,the basic expansion planning model for the EGIES,the sub-model of the N-1 security check,and the submodel of restorability capacity verification are respectively proposed.Then,the iterative solution strategy is proposed,in which the solutions of the basic planning model are delivered to the sub-models and the feasible cutting constraints generated by solving the sub-models are delivered to the planning model.Finally,the simulation results of the 9-bus power system with an 8-node gas system and the IEEE 39-bus power system with a 20-node gas system show the effectiveness of the proposed planning method in enhancing the resilience of the EGIES's planning scheme.展开更多
Objective:To observe the expression of N-acetyl-glucosamine-6-O-sulfotransferase(GN-6-ST)in the endometrium during the window stage of implantation from infertile women before IVF-ET treatment,we compared the GN-6-ST ...Objective:To observe the expression of N-acetyl-glucosamine-6-O-sulfotransferase(GN-6-ST)in the endometrium during the window stage of implantation from infertile women before IVF-ET treatment,we compared the GN-6-ST gene expression level between the women with succeeded and failed implantation,and investigated the roles of selectin and its ligands in the embryo implantation.Methods:The hysteroscopy and endometrial biopsies were performed in patients prior to undergoing IVF-ET treatment in the IVF Center of the First Affiliated Hospital of Nanjing Medical University from July 2004 to March 2005.Fourteen patients who succeeded in implantation were taken as study group,while the 28 infertile patients with failed implantation served as control group.The RT-PCR method was used to detect the mRNA levels of N-acetyl-glucosamine-6-O-sulfotransferase in the endometrium during the window stage of imp-lantation of the women from both groups.Results:For these infertile patients with succeeded implantation,the average mRNA expression level of acetyl-glucosamine-6-O-sulfotransferase in the endometrium during the window stage of implantation was(0.65±0.33),while for those with failed implantation cycle,the average mRNA expression level was(0.41±0.36),which was significantly lower than that of study group,P<0.05.Conclusions:The combination of the selectin and ligands may play a role in the embryo implantation capacibility.展开更多
Southern Africa has experienced electric power deficits over the last decade. This has been due in part to the member countries＇ inadequate electrical power supply system, as well as load growth in areas which were n...Southern Africa has experienced electric power deficits over the last decade. This has been due in part to the member countries＇ inadequate electrical power supply system, as well as load growth in areas which were not adequately planned for. This has induced the formation of organizations such as SADC （Southern African Development Community） and SAPP （Southern African Power Pool） that have the common goal of achieving development and economic growth in the region which comprises of 15 member countries. This paper presents results from a security analysis of the region＇s electric power supply system using a baseline level of performance. This was carried out by performing a steady-state contingency analysis on a SADC power network model subject to the N-1 criteria which expresses the ability of the power network to experience a contingency without causing an overload or failure in any other part of the network. Simulations were carried out using DigSilent.展开更多
文摘Under the influence of extreme natural disasters and man-made cyber attacks,the electricity-gas integrated energy system(EGIES)may experience power failure and gas interruption,which have significant impacts on the national economy and social stability.This paper proposes an expansion planning strategy for the EGIES considering N-1 security constraints and restorability capacity.First,the basic expansion planning model for the EGIES,the sub-model of the N-1 security check,and the submodel of restorability capacity verification are respectively proposed.Then,the iterative solution strategy is proposed,in which the solutions of the basic planning model are delivered to the sub-models and the feasible cutting constraints generated by solving the sub-models are delivered to the planning model.Finally,the simulation results of the 9-bus power system with an 8-node gas system and the IEEE 39-bus power system with a 20-node gas system show the effectiveness of the proposed planning method in enhancing the resilience of the EGIES's planning scheme.
文摘Objective:To observe the expression of N-acetyl-glucosamine-6-O-sulfotransferase(GN-6-ST)in the endometrium during the window stage of implantation from infertile women before IVF-ET treatment,we compared the GN-6-ST gene expression level between the women with succeeded and failed implantation,and investigated the roles of selectin and its ligands in the embryo implantation.Methods:The hysteroscopy and endometrial biopsies were performed in patients prior to undergoing IVF-ET treatment in the IVF Center of the First Affiliated Hospital of Nanjing Medical University from July 2004 to March 2005.Fourteen patients who succeeded in implantation were taken as study group,while the 28 infertile patients with failed implantation served as control group.The RT-PCR method was used to detect the mRNA levels of N-acetyl-glucosamine-6-O-sulfotransferase in the endometrium during the window stage of imp-lantation of the women from both groups.Results:For these infertile patients with succeeded implantation,the average mRNA expression level of acetyl-glucosamine-6-O-sulfotransferase in the endometrium during the window stage of implantation was(0.65±0.33),while for those with failed implantation cycle,the average mRNA expression level was(0.41±0.36),which was significantly lower than that of study group,P<0.05.Conclusions:The combination of the selectin and ligands may play a role in the embryo implantation capacibility.
文摘Southern Africa has experienced electric power deficits over the last decade. This has been due in part to the member countries＇ inadequate electrical power supply system, as well as load growth in areas which were not adequately planned for. This has induced the formation of organizations such as SADC （Southern African Development Community） and SAPP （Southern African Power Pool） that have the common goal of achieving development and economic growth in the region which comprises of 15 member countries. This paper presents results from a security analysis of the region＇s electric power supply system using a baseline level of performance. This was carried out by performing a steady-state contingency analysis on a SADC power network model subject to the N-1 criteria which expresses the ability of the power network to experience a contingency without causing an overload or failure in any other part of the network. Simulations were carried out using DigSilent.
