Vehicle riding comfort and handling stability are directly affected by suspension performance.A novel dual chamber hydro-pneumatic(DCHP)suspension system is developed in this paper.Based on the structural analysis of ...Vehicle riding comfort and handling stability are directly affected by suspension performance.A novel dual chamber hydro-pneumatic(DCHP)suspension system is developed in this paper.Based on the structural analysis of the DCHP suspension,an equivalent suspension model is proposed for the control purpose.A cuckoo search(CS)based fuzzy PID controller is proposed for the control of the DCHP suspension system.The proposed controller combines the advantage of fuzzy logic and PID controller,and CS algorithm is used to regulate the membership functions and PID parameters.Compared with tradition LQR controller and passive suspension system,the CSFPID controller can reduce the sprung mass acceleration,and at the same time with no deterioration of tire deflection.展开更多
The atrial pacing lead is believed having higher stimulation thresholds and long-term complication rates than ventricular lead, this being one of the factors limiting the use of dual chamber pacing. A prospective stud...The atrial pacing lead is believed having higher stimulation thresholds and long-term complication rates than ventricular lead, this being one of the factors limiting the use of dual chamber pacing. A prospective study was undertaken to evaluate both atrial and ventricular bipolar lined steroid-eluting leads in long-term dual chamber pacing. There are 81 pairs of leads (Medtronic Capsure SP) used in 81 patients. Bipolar atrial and ventricular stimulation thresholds were measured immediately post implantation and 1,3, 6,12,18 and 24 months. All leads demonstrated low mean stimulation thresholds during the follow-up and more than 94 % of leads could be paced chronically in the atrium and ventricle at 2.5 volts. In conclusion, atrial and ventricular steroid-eluting leads gave excellent stimulation thresholds allowing low energy long-term dual chamber pacing.展开更多
Objective: To study the interaction between granulosa and thecal cel1s in steroidogenesis in an am-nion dual chamber in comparison with the cellulose dual chamber.Method: A dual chamber culture system was designed and...Objective: To study the interaction between granulosa and thecal cel1s in steroidogenesis in an am-nion dual chamber in comparison with the cellulose dual chamber.Method: A dual chamber culture system was designed and prepared with amnion membrane from human term placenta. The isolated porcine granulosa and thecal cells were grown on both sides of the amnion membrane, with granulosa cells in the inner chamber and thecal cells in the outer chamber. The concentrations of estradiol (E,), progesterone (P) and testosterone (T) in the culture media were mea-sured by radioimmunoassay.Results: The growth of both cells and their steroidogenic function were more active in amnion dual chamber system than in cellulose dual chamber system: (1) more T produced by thecal cells in the outer chamber, passing into inner chamber through the amnion membrane. T was used by granulosa cells as the substrate of aromatization, so that granulosa cells produced more E2 (up to 2 435 pmol/L); (2) the production of P (52. 5 μmol/L) and T (10. 2μmol/L) by granulosa cells cultured in the amnion mem-brane dual chamber system were also higher.Conclusions:The dual chamber system made of amnion mpmbrane showed better effect in studying steroidogenesis than with cellulose dual chamber system, and can be used as a model for studying paracrine regulatory interaction between granulosa and thecal cells in vitro.展开更多
Objectives To assess the preliminary clinical results of implantation of dual chamber pacemaker defibrillator and to evaluate the safety and effectiveness of placement of endocardial leads in the axillary vein. Meth...Objectives To assess the preliminary clinical results of implantation of dual chamber pacemaker defibrillator and to evaluate the safety and effectiveness of placement of endocardial leads in the axillary vein. Methods Seven patients with ventricular tachycardia and/or ventricular fibrillation (VT/VF), associated with bradyarrhythmia received implantation of a dual chamber pacemaker defibrillator, including 5 patients with coronary artery disease and 2 patients with dilated cardiomyopathy.The atrial and ventricular leads were introduced via the axillary vein under venographic guidance. Results Dual chamber pacemaker defibrillators were successfully implanted in the left chest subcutaneous pocket in 5 patients and the left pectoral muscular pocket in 2 patients. All the VT/VF occurring either inducibly during the procedure or spontanuously during follow-up were detected promptly and treated successfully. Both the pacing and sensing functions were satisfactory. The endocardial leads required were successfully introduced via the axillary vein without major complications.Conclusion Dual chamber pacemaker defibrillators can provide reliable therapy for VT/VF and the dual chamber pacing function. Placement of endocardial leads via the axillary vein under venographic guidance is safe and effective.展开更多
The Hyperbaric and Diving Medicine Centre of Singapore provides regular treatment for various UHMS indications for hyperbaric treatment in our dual multi-place connected chambers. When any single patient requires evac...The Hyperbaric and Diving Medicine Centre of Singapore provides regular treatment for various UHMS indications for hyperbaric treatment in our dual multi-place connected chambers. When any single patient requires evacuation during the treatment, a connected dual chamber facility is advantageous to avoid disruption for the remaining patients. We share our experience and procedures to facilitate repeated unexpected evacuation with minimal disruption to other patients undergoing treatment, in an elderly semiactivity dependent patient who had gastrointestinal symptoms during treatment.展开更多
Ethylene cracking process is the core production process in ethylene industry,and is paid more attention to reduce high energy consumption.Because of the interdependent relationships between multi-flow allocation and ...Ethylene cracking process is the core production process in ethylene industry,and is paid more attention to reduce high energy consumption.Because of the interdependent relationships between multi-flow allocation and multi-parameter setting in cracking process,it is difficult to find the overall energy efficiency scheduling for the purpose of saving energy.The traditional scheduling solutions with optimal economic benefit are not applicable for energy efficiency scheduling issue due to the neglecting of recycle and lost energy,as well as critical operation parameters as coil outlet pressure(COP)and dilution ratio.In addition,the scheduling solutions mostly regard each cracking furnace as an elementary unit,regardless of the coordinated operation of internal dual radiation chambers(DRC).Therefore,to improve energy utilization and production operation,a novel energy efficiency scheduling solution for ethylene cracking process is proposed in this paper.Specifically,steam heat recycle and exhaust heat loss are considered in cracking process based on 6 types of extreme learning machine(ELM)based cracking models incorporating DRC operation and three operation parameters as coil outlet temperature(COT),COP,and dilution ratio according to semi-mechanism analysis.Then to provide long-term decision-making basis for energy efficiency scheduling,overall energy efficiency indexes,including overall output per unit net energy input(OONE),output-input ratio per unit net energy input(ORNE),exhaust gas heat loss ratio(EGHL),are designed based on input-output analysis in terms of material and energy flows.Finally,a multiobjective evolutionary algorithm based on decomposition(MOEA/D)is employed to solve the formulated multi-objective mixed-integer nonlinear programming(MOMINLP)model.The validities of the proposed scheduling solution are illustrated through a case study.The scheduling results demonstrate that an optimal balance between multi-flow allocation,multi-parameter setting,and DRC coordinated operation is reached,which achieves 3.37%and 2.63%decreases in net energy input for same product output and conversion ratio,as well as the 1.56%decrease in energy loss ratio.展开更多
基金Supported by the National Natural Science Foundation of China(U1564210)China Postdoctoral Science Foundation(2016M600934BX201600017)
文摘Vehicle riding comfort and handling stability are directly affected by suspension performance.A novel dual chamber hydro-pneumatic(DCHP)suspension system is developed in this paper.Based on the structural analysis of the DCHP suspension,an equivalent suspension model is proposed for the control purpose.A cuckoo search(CS)based fuzzy PID controller is proposed for the control of the DCHP suspension system.The proposed controller combines the advantage of fuzzy logic and PID controller,and CS algorithm is used to regulate the membership functions and PID parameters.Compared with tradition LQR controller and passive suspension system,the CSFPID controller can reduce the sprung mass acceleration,and at the same time with no deterioration of tire deflection.
文摘The atrial pacing lead is believed having higher stimulation thresholds and long-term complication rates than ventricular lead, this being one of the factors limiting the use of dual chamber pacing. A prospective study was undertaken to evaluate both atrial and ventricular bipolar lined steroid-eluting leads in long-term dual chamber pacing. There are 81 pairs of leads (Medtronic Capsure SP) used in 81 patients. Bipolar atrial and ventricular stimulation thresholds were measured immediately post implantation and 1,3, 6,12,18 and 24 months. All leads demonstrated low mean stimulation thresholds during the follow-up and more than 94 % of leads could be paced chronically in the atrium and ventricle at 2.5 volts. In conclusion, atrial and ventricular steroid-eluting leads gave excellent stimulation thresholds allowing low energy long-term dual chamber pacing.
文摘Objective: To study the interaction between granulosa and thecal cel1s in steroidogenesis in an am-nion dual chamber in comparison with the cellulose dual chamber.Method: A dual chamber culture system was designed and prepared with amnion membrane from human term placenta. The isolated porcine granulosa and thecal cells were grown on both sides of the amnion membrane, with granulosa cells in the inner chamber and thecal cells in the outer chamber. The concentrations of estradiol (E,), progesterone (P) and testosterone (T) in the culture media were mea-sured by radioimmunoassay.Results: The growth of both cells and their steroidogenic function were more active in amnion dual chamber system than in cellulose dual chamber system: (1) more T produced by thecal cells in the outer chamber, passing into inner chamber through the amnion membrane. T was used by granulosa cells as the substrate of aromatization, so that granulosa cells produced more E2 (up to 2 435 pmol/L); (2) the production of P (52. 5 μmol/L) and T (10. 2μmol/L) by granulosa cells cultured in the amnion mem-brane dual chamber system were also higher.Conclusions:The dual chamber system made of amnion mpmbrane showed better effect in studying steroidogenesis than with cellulose dual chamber system, and can be used as a model for studying paracrine regulatory interaction between granulosa and thecal cells in vitro.
文摘Objectives To assess the preliminary clinical results of implantation of dual chamber pacemaker defibrillator and to evaluate the safety and effectiveness of placement of endocardial leads in the axillary vein. Methods Seven patients with ventricular tachycardia and/or ventricular fibrillation (VT/VF), associated with bradyarrhythmia received implantation of a dual chamber pacemaker defibrillator, including 5 patients with coronary artery disease and 2 patients with dilated cardiomyopathy.The atrial and ventricular leads were introduced via the axillary vein under venographic guidance. Results Dual chamber pacemaker defibrillators were successfully implanted in the left chest subcutaneous pocket in 5 patients and the left pectoral muscular pocket in 2 patients. All the VT/VF occurring either inducibly during the procedure or spontanuously during follow-up were detected promptly and treated successfully. Both the pacing and sensing functions were satisfactory. The endocardial leads required were successfully introduced via the axillary vein without major complications.Conclusion Dual chamber pacemaker defibrillators can provide reliable therapy for VT/VF and the dual chamber pacing function. Placement of endocardial leads via the axillary vein under venographic guidance is safe and effective.
文摘The Hyperbaric and Diving Medicine Centre of Singapore provides regular treatment for various UHMS indications for hyperbaric treatment in our dual multi-place connected chambers. When any single patient requires evacuation during the treatment, a connected dual chamber facility is advantageous to avoid disruption for the remaining patients. We share our experience and procedures to facilitate repeated unexpected evacuation with minimal disruption to other patients undergoing treatment, in an elderly semiactivity dependent patient who had gastrointestinal symptoms during treatment.
基金supported by the High-tech Research and Development Program of China(2014AA041802)。
文摘Ethylene cracking process is the core production process in ethylene industry,and is paid more attention to reduce high energy consumption.Because of the interdependent relationships between multi-flow allocation and multi-parameter setting in cracking process,it is difficult to find the overall energy efficiency scheduling for the purpose of saving energy.The traditional scheduling solutions with optimal economic benefit are not applicable for energy efficiency scheduling issue due to the neglecting of recycle and lost energy,as well as critical operation parameters as coil outlet pressure(COP)and dilution ratio.In addition,the scheduling solutions mostly regard each cracking furnace as an elementary unit,regardless of the coordinated operation of internal dual radiation chambers(DRC).Therefore,to improve energy utilization and production operation,a novel energy efficiency scheduling solution for ethylene cracking process is proposed in this paper.Specifically,steam heat recycle and exhaust heat loss are considered in cracking process based on 6 types of extreme learning machine(ELM)based cracking models incorporating DRC operation and three operation parameters as coil outlet temperature(COT),COP,and dilution ratio according to semi-mechanism analysis.Then to provide long-term decision-making basis for energy efficiency scheduling,overall energy efficiency indexes,including overall output per unit net energy input(OONE),output-input ratio per unit net energy input(ORNE),exhaust gas heat loss ratio(EGHL),are designed based on input-output analysis in terms of material and energy flows.Finally,a multiobjective evolutionary algorithm based on decomposition(MOEA/D)is employed to solve the formulated multi-objective mixed-integer nonlinear programming(MOMINLP)model.The validities of the proposed scheduling solution are illustrated through a case study.The scheduling results demonstrate that an optimal balance between multi-flow allocation,multi-parameter setting,and DRC coordinated operation is reached,which achieves 3.37%and 2.63%decreases in net energy input for same product output and conversion ratio,as well as the 1.56%decrease in energy loss ratio.
