IMPROVE THE KINETIC PERFORMANCE OF THE PUMP CONTROLLED CLAMPING UNIT IN PLASTIC INJECTION MOLDING MACHINE WITH ADAPTIVE CONTROL STRATEGY

The kinetic characteristics of the clamping unit of plastic injection molding machine that is controlled by close loop with newly developed double speed variable pump unit are investigated. Considering the wide variation of the cylinder equivalent mass caused by the transmission ratio of clamping unit and the severe instantaneous impact force acted on the cylinder during the mold closing and opening process, an adaptive control principle of parameter and structure is proposed to improve its kinetic performance. The adaptive correlation between the acceleration feedback gain and the variable mass is derived. The pressure differential feedback is introduced to improve the dynamic performance in the case of small inertia and heavy impact load. The adaptation of sum pressure to load is used to reduce the energy loss of the system. The research results are verified by the simulation and experiment, The investigation method and the conclusions are also suitable for the differential cylinder system controlled by the traditional servo pump unit.

Diode pumped injection seeded Nd:YAG laser

Diode pumped, injection seeded single-longitudinal-mode （SLM） Nd：YAG laser is achieved through buildup time minimizing technique in Q-switching operation. Pulses with energy of 20 mJ are obtained at a repetition rate of 100 Hz. Mx^2 and My^2 are 1.41 and 1.38, respectively.

Experiment Investigation and Control Strategies on Two-Phase Refrigerant Injection Heat Pump System for Electric Vehicle in Start-up Stage

Due to the poor heating performance and operating safety in low ambient temperature,traditional Air Source Heat Pump(ASHP)for Electric Vehicles(EVs)has many limits in cold region,which can be solved by the ASHP with refrigerant injection.During the start-up stage of EV in winter,the inlet air temperature of the in-car condenser is the same as the ambient temperature.At this situation,the performance and control strategy of the heat pump require special attention.In the present study,a series of experiments were carried out on the heating performance of the Refrigerant Injection Heat Pump(RIHP)system in start-up stage of EV,at the ambient temperature from–20℃ to–5℃.The effects of compressor speed and injected refrigerant state on the heating performance of the system were discussed in depth.According to the results,the control strategies during start-up stage have been discussed in the end of the article.The study provides a practical control strategy for the RIHP system during the start-up stage of electric vehicles,helping to efficiently operate electric vehicles in cold regions.

Design and analysis of a novel dual source vapor injection heat pump using exhaust and ambient air

A novel dual source vapor injection heat pump(DSVIHP)using exhaust and ambient air is proposed.The air exhausted from the building first releases energy to the medium-pressure evaporator and is then mixed with the ambient air to heat the low-pressure evaporator.A vapor injection(VI)compressor of two inlets is connected with the low and medium pressure evaporators.It’s first time that a VI compressor is employed to recover the ventilation heat.The system can minimize the ventilation heat loss and provide a unique defrosting approach by using the exhaust waste heat.Fundamentals of the proposed DSVIHP are illustrated.Mathematical models are built.Both energetic and exergetic analyses are carried out under variable conditions.The results indicate that the DSVIHP has superior thermodynamic performance.The superiority is more appreciable at a lower ambient temperature.It has a higher COP than the conventional vapor injection heat pump and air source heat pump by 11.3%and 23.2%respectively at an ambient temperature of-10°C and condensation temperature of 45°C.The waste heat recovery ratio from the exhaust air is more than 100%.The novel DSVIHP has great potential in the cold climate area application.

Shenfu Injection(参附注射液) Inhibits Inflammation in Patients with Acute Myocardial Infarction Complicated by Cardiac Shock

Objectives： To investigate the effect of Shenfu Injection（参附注射液, SFI） on inflammatory factors in patients with acute myocardial infarction complicated by cardiogenic shock（CS） treated with and intra-aortic balloon pump（IABP）. Methods： This study enrolled 60 patients with ST-segment elevation myocardial infarction（STEMI） complicated by CS. Patients underwent IABP and emergency percutaneous coronary intervention（PCI） were randomly divided into two groups by random number table with 30 cases in each group, one given SFI treatment（100 m L/24 h）, one not. The two groups were then compared in a clinical setting for left ventricular function, biochemical indicators and Inflammatory factors, including C-reactive proteins（CRP）, interleukin-1（IL-1） and tumor necrosis factor alpha（TNF-α）. Major adverse cardiac and cerebrovascular events（MACCE） events were compared between patients of the two groups both in-hospital and in follow-ups. Results： The IABP support treatment times of patients in the IABP＋SFI group were significantly shorter than the IABP group（52.87±28.84 vs. 87.45±87.31, P=0.047）. In the patients of the IABP＋SFI group, the CRP peak appeared in 24 h after PCI operation. The CRP peak in the patients of the IABP＋SFI group was significantly lower than that in the IABP group（31.27±3.93 vs. 34.62±3.47, P=0.001）. The increases in range of TNF-α in the patients of the IABP＋SFI group were significantly lower than those of the IABP group（182.29±22.79 vs. 195.54±12.02, P=0.007）. The increases in range of IL-1 in the patients of the IABP＋SFI group were significantly lower than those of the IABP group（214.98±29.22 vs. 228.60±7.03, P=0.019）. The amplitude elevated TNF-α 72 h after admission was an independent risk factor of in-hospital MACCE events（OR 0.973, 95% CI 0.890–0.987, P=0.014） in patients with STEMI and CS. Conclusion： Patients with STEMI complicated by CS treated by IABP and SFI had a reduced inflammatory reaction, a reduced dependence of CS on IABP and shortened the course of disease.