[Objectives]To improve the thermal insulation performance of solar greenhouses in winter,enhance solar energy utilization efficiency,reduce additional carbon emissions,and lower winter heating costs for greenhouses.[M...[Objectives]To improve the thermal insulation performance of solar greenhouses in winter,enhance solar energy utilization efficiency,reduce additional carbon emissions,and lower winter heating costs for greenhouses.[Methods]An active heat storage and release water bag was added inside the solar greenhouse.Comparative experiments were conducted between the experimental greenhouse K1 equipped with the heat storage water bag and the control greenhouse K2 under different winter night weather conditions.[Results]On sunny days,the maximum temperature difference between K1 and K2 was 2.3℃,and the average temperature during the water bag's heat release period increased by 2.2℃;on cloudy days,the maximum temperature difference was 2.2℃,and the average temperature increased by 2.0℃;on snowy days,the maximum temperature difference was 1.8℃,and the average temperature increased by 1.6℃.Additionally,the heat storage capacities of the water bag on sunny,cloudy,and snowy days were 491.4,453.6,and 365.4 MJ,respectively.The corresponding nighttime heat release amounts were 378,302.4,and 226.8 MJ,respectively.The corresponding heat storage-release efficiencies were 76%,66.2%,and 62%,respectively.The service life of the heat storage water bag can reach 10 years,with an annual operating cost of approximately 2500 yuan.[Conclusions]By comprehensively analyzing the initial costs,operating expenses,and cost savings rate compared to coal burning for current main energy-saving heat storage and warming equipment in solar greenhouses,this study provides reference suggestions for the promotion,application,and selection of winter heat storage and warming equipment for solar greenhouses in different regions.Users can choose to install the equipment based on the performance characteristics of the heat storage water bag and their actual needs.展开更多
[Objectives]To investigate optimal storage methods and shelf life determination for several representative bagged traditional Chinese medicine(TCM)decoctions under centralized preparation conditions in intelligent TCM...[Objectives]To investigate optimal storage methods and shelf life determination for several representative bagged traditional Chinese medicine(TCM)decoctions under centralized preparation conditions in intelligent TCM pharmacies.[Methods]First,the nourishing formula was prepared and packaged in bags.Under the three storage conditions of 37℃before cold storage(including full high temperature),cold storage before 37℃(including full cold storage),and alternating 37℃and cold storage,the 30 d cycle was investigated to determine the total microbial colony count,so as to determine a reasonable storage method of traditional Chinese medicine decoction.Secondly,five representative prescriptions were prepared and packaged in bags,stored under 37℃,room temperature and cold conditions.The investigation period was 30 d.The pH,total bacterial count and soluble solid content were measured,and the changes of each index were analyzed to obtain the shelf life of the bagged Chinese medicine decoction.[Results]First,the nourishing formula was investigated for 30 d.The microbial results of refrigeration after 1-2 d of 37℃,complete refrigeration and 37℃cooling with an alternate interval of 2 d or less met the requirements,while the microbial results of refrigeration after 3 d or above of 37℃,refrigeration after 1-5 d and then 37℃,complete 37℃,37℃and cooling with an alternate interval of 3 d or above excessive microorganism.Second,under the condition of 37℃storage,the pH of the five prescriptions decreased significantly,the total microbial colonies exceeded the standard,and the solid content decreased significantly.However,under the condition of room temperature and cold storage,the pH,total microbial colonies,and solid content of the five prescriptions remained stable.[Conclusions]The first is to refrigerate the decoction after 1-2 d of 37℃,completely refrigerate it,and refrigerate the decoction with an alternate interval of 2 d or less at 37℃.The shelf life can last for 30 d.Several storage conditions are conducive to guiding the development of the storage mode of the decoction.Second,under the conditions of cold storage,all the indexes were stable,and the shelf life of the five representative formulas was 30 d.展开更多
BACKGROUND:In this study,we aimed to evaluate the impact of mechanical ventilator(MV)utilizaton during cardiopulmonary resuscitation(CPR)on out-of-hospital cardiac arrest(OHCA)patient clinical outcomes in the emergenc...BACKGROUND:In this study,we aimed to evaluate the impact of mechanical ventilator(MV)utilizaton during cardiopulmonary resuscitation(CPR)on out-of-hospital cardiac arrest(OHCA)patient clinical outcomes in the emergency department.METHODS:This single-centered,retrospective,case-control study analyzed electronic medical records.Patients aged>18 years with non-traumatic OHCA who were treated at an emergency medical center between January 2019 and December 2023 were included.These patients were accessed according to the ventilatory method used:MV ventilation(volume control,tidal volume 6-8 mL/kg,frequency 10 beat per minute,inspiratory time 1 s)and manual resuscitator bag valve(BV)ventilation.The primary outcome was the return of spontaneous circulation(ROSC).After 1:1 propensity score matching,the clinical outcomes were analyzed.RESULTS:A total of 649 patients were enrolled in this study.Before matching,the clinical outcomes and pneumothorax incidence did not differ between the MV and BV groups.After 1:1 matching between the two groups using propensity scores,522 patients(261 MV and 261 BV)were analyzed.Propensity score matching yielded an adequate balance(standardized mean difference<0.10)for all covariates.The estimated odds ratio(OR)for ROSC was 1.23(95%confidence interval[CI]:0.85-1.77;P=0.267),for survival at hospital admission was 1.02(95%CI:0.68-1.53;P=0.918),for survival at hospital discharge was 2.31(95%CI:1.10-5.20;P=0.033),and for good neurologic outcome was 2.56(95%CI:0.84-9.43;P=0.116).CONCLUSION:In patients with OHCA admitted to the emergency department,MV ventilation during CPR showed clinical outcomes similar to those of BV ventilation in most measures.However,survival at hospital discharge was significantly higher in the MV group,suggesting potential benefits of MV use in selected patients.展开更多
A buffer bag mechanism is designed,which can provide axial impact protection under small displacement.The stiffness characteristics of the structure under impact load are studied.The stiffness of the mechanism and the...A buffer bag mechanism is designed,which can provide axial impact protection under small displacement.The stiffness characteristics of the structure under impact load are studied.The stiffness of the mechanism and the internal pressure change of the buffer bag are compared and analyzed,when the filling materials are liquid and gas respectively.Finally,the influence of initial fluid bag pressure,bulk modulus and shell thickness on the stiffness of the mechanism and the change of bag pressure are studied.The results show that the stiffness of the liquid bag is better than that of the gas bag when the filler is liquid and gas;the liquid bag has obvious pressure rise after the mechanism is subjected to axial force by 300 kN,and the gas bag has almost no pressure rise;the change of bulk modulus,which is1000,1500,2000 and 2500 MPa,has an obvious effect on the liquid bag,and it is positively correlated with the stiffness of the mechanism.The change of gas modulus,which is 28 and 44,has little effect on the stiffness of the mechanism;the thickness of the buffer bag,which is 5,10 and 15 mm,also has an obvious effect on the stiffness.The stiffness of the liquid bag is greater,and the protection for flexible joint is better in the same condition.展开更多
基金Supported by Hetian Prefecture Regional-Level Planning Project(20220219)。
文摘[Objectives]To improve the thermal insulation performance of solar greenhouses in winter,enhance solar energy utilization efficiency,reduce additional carbon emissions,and lower winter heating costs for greenhouses.[Methods]An active heat storage and release water bag was added inside the solar greenhouse.Comparative experiments were conducted between the experimental greenhouse K1 equipped with the heat storage water bag and the control greenhouse K2 under different winter night weather conditions.[Results]On sunny days,the maximum temperature difference between K1 and K2 was 2.3℃,and the average temperature during the water bag's heat release period increased by 2.2℃;on cloudy days,the maximum temperature difference was 2.2℃,and the average temperature increased by 2.0℃;on snowy days,the maximum temperature difference was 1.8℃,and the average temperature increased by 1.6℃.Additionally,the heat storage capacities of the water bag on sunny,cloudy,and snowy days were 491.4,453.6,and 365.4 MJ,respectively.The corresponding nighttime heat release amounts were 378,302.4,and 226.8 MJ,respectively.The corresponding heat storage-release efficiencies were 76%,66.2%,and 62%,respectively.The service life of the heat storage water bag can reach 10 years,with an annual operating cost of approximately 2500 yuan.[Conclusions]By comprehensively analyzing the initial costs,operating expenses,and cost savings rate compared to coal burning for current main energy-saving heat storage and warming equipment in solar greenhouses,this study provides reference suggestions for the promotion,application,and selection of winter heat storage and warming equipment for solar greenhouses in different regions.Users can choose to install the equipment based on the performance characteristics of the heat storage water bag and their actual needs.
文摘[Objectives]To investigate optimal storage methods and shelf life determination for several representative bagged traditional Chinese medicine(TCM)decoctions under centralized preparation conditions in intelligent TCM pharmacies.[Methods]First,the nourishing formula was prepared and packaged in bags.Under the three storage conditions of 37℃before cold storage(including full high temperature),cold storage before 37℃(including full cold storage),and alternating 37℃and cold storage,the 30 d cycle was investigated to determine the total microbial colony count,so as to determine a reasonable storage method of traditional Chinese medicine decoction.Secondly,five representative prescriptions were prepared and packaged in bags,stored under 37℃,room temperature and cold conditions.The investigation period was 30 d.The pH,total bacterial count and soluble solid content were measured,and the changes of each index were analyzed to obtain the shelf life of the bagged Chinese medicine decoction.[Results]First,the nourishing formula was investigated for 30 d.The microbial results of refrigeration after 1-2 d of 37℃,complete refrigeration and 37℃cooling with an alternate interval of 2 d or less met the requirements,while the microbial results of refrigeration after 3 d or above of 37℃,refrigeration after 1-5 d and then 37℃,complete 37℃,37℃and cooling with an alternate interval of 3 d or above excessive microorganism.Second,under the condition of 37℃storage,the pH of the five prescriptions decreased significantly,the total microbial colonies exceeded the standard,and the solid content decreased significantly.However,under the condition of room temperature and cold storage,the pH,total microbial colonies,and solid content of the five prescriptions remained stable.[Conclusions]The first is to refrigerate the decoction after 1-2 d of 37℃,completely refrigerate it,and refrigerate the decoction with an alternate interval of 2 d or less at 37℃.The shelf life can last for 30 d.Several storage conditions are conducive to guiding the development of the storage mode of the decoction.Second,under the conditions of cold storage,all the indexes were stable,and the shelf life of the five representative formulas was 30 d.
文摘BACKGROUND:In this study,we aimed to evaluate the impact of mechanical ventilator(MV)utilizaton during cardiopulmonary resuscitation(CPR)on out-of-hospital cardiac arrest(OHCA)patient clinical outcomes in the emergency department.METHODS:This single-centered,retrospective,case-control study analyzed electronic medical records.Patients aged>18 years with non-traumatic OHCA who were treated at an emergency medical center between January 2019 and December 2023 were included.These patients were accessed according to the ventilatory method used:MV ventilation(volume control,tidal volume 6-8 mL/kg,frequency 10 beat per minute,inspiratory time 1 s)and manual resuscitator bag valve(BV)ventilation.The primary outcome was the return of spontaneous circulation(ROSC).After 1:1 propensity score matching,the clinical outcomes were analyzed.RESULTS:A total of 649 patients were enrolled in this study.Before matching,the clinical outcomes and pneumothorax incidence did not differ between the MV and BV groups.After 1:1 matching between the two groups using propensity scores,522 patients(261 MV and 261 BV)were analyzed.Propensity score matching yielded an adequate balance(standardized mean difference<0.10)for all covariates.The estimated odds ratio(OR)for ROSC was 1.23(95%confidence interval[CI]:0.85-1.77;P=0.267),for survival at hospital admission was 1.02(95%CI:0.68-1.53;P=0.918),for survival at hospital discharge was 2.31(95%CI:1.10-5.20;P=0.033),and for good neurologic outcome was 2.56(95%CI:0.84-9.43;P=0.116).CONCLUSION:In patients with OHCA admitted to the emergency department,MV ventilation during CPR showed clinical outcomes similar to those of BV ventilation in most measures.However,survival at hospital discharge was significantly higher in the MV group,suggesting potential benefits of MV use in selected patients.
基金supported by the Fundamental Research Funds for the Central Universities(No.NS2019003)。
文摘A buffer bag mechanism is designed,which can provide axial impact protection under small displacement.The stiffness characteristics of the structure under impact load are studied.The stiffness of the mechanism and the internal pressure change of the buffer bag are compared and analyzed,when the filling materials are liquid and gas respectively.Finally,the influence of initial fluid bag pressure,bulk modulus and shell thickness on the stiffness of the mechanism and the change of bag pressure are studied.The results show that the stiffness of the liquid bag is better than that of the gas bag when the filler is liquid and gas;the liquid bag has obvious pressure rise after the mechanism is subjected to axial force by 300 kN,and the gas bag has almost no pressure rise;the change of bulk modulus,which is1000,1500,2000 and 2500 MPa,has an obvious effect on the liquid bag,and it is positively correlated with the stiffness of the mechanism.The change of gas modulus,which is 28 and 44,has little effect on the stiffness of the mechanism;the thickness of the buffer bag,which is 5,10 and 15 mm,also has an obvious effect on the stiffness.The stiffness of the liquid bag is greater,and the protection for flexible joint is better in the same condition.
