Hydrogen is considered one of the most ideal future energy carriers.The safe storage and convenient transportation of hydrogen are key factors for the utilization of hydrogen energy.In the current investigation,two-di...Hydrogen is considered one of the most ideal future energy carriers.The safe storage and convenient transportation of hydrogen are key factors for the utilization of hydrogen energy.In the current investigation,two-dimensional vanadium carbide(VC) was prepared by an etching method using V_(4)AlC_(3) as a precursor and then employed to enhance the hydrogen storage properties of MgH_(2).The studied results indicate that VC-doped MgH_(2) can absorb hydrogen at room temperature and release hydrogen at 170℃. Moreover,it absorbs 5.0 wt.%of H_(2) within 9.8 min at 100℃ and desorbs 5.0 wt.% of H_(2) within 3.2 min at 300℃.The dehydrogenation apparent activation energy of VC-doped MgH_(2) is 89.3 ± 2.8 kJ/mol,which is far lower than that of additive-free MgH_(2)(138.5 ± 2.4 kJ/mol),respectively.Ab-initio simulations showed that VC can stretch Mg-H bonds and make the Mg-H bonds easier to break,which is responsible for the decrease of dehydrogenation temperature and conducive to accelerating the diffusion rate of hydrogen atoms,thus,the hydrogen storage properties of MgH_(2) are remarkable improved through addition of VC.展开更多
【目的】探索集约化和多模式集中办刊思路,解决编务工作内容较为琐碎、各刊间存在大量重复工作、效率低下等问题,实现自动化整合编务工作。【方法】在需求分析的基础上,设计集约化、通用性的作者信息基础模块,利用Visual Basic for Appl...【目的】探索集约化和多模式集中办刊思路,解决编务工作内容较为琐碎、各刊间存在大量重复工作、效率低下等问题,实现自动化整合编务工作。【方法】在需求分析的基础上,设计集约化、通用性的作者信息基础模块,利用Visual Basic for Applications(VBA)编程,实现自动化整合编务工作。【结果】实现基于作者信息表批量生成对接银行、单位财务、快递公司的相应信息表单。【结论】所提方法具有较高的可行性和可扩展性,能够提高编务工作效率,并为期刊整合工作提供借鉴。展开更多
Background Aspirin and clopidogrel resistance plays a significant role in the development of cardiovascular ischemic events for ninety patients undergoing percutaneous coronary intervention.Recent studies have indicat...Background Aspirin and clopidogrel resistance plays a significant role in the development of cardiovascular ischemic events for ninety patients undergoing percutaneous coronary intervention.Recent studies have indicated that increasing the dose of antiplatelet drugs maybe a potent method to improve the inhibition of platelet aggregation.Methods Thrombelastograph （TEG） determinations were used to evaluate the effect of antiplatelet therapy.According to the results,90 patients were divided into three groups and given different doses of aspirin and clopidogrel.Thirty patients with both an inhibition rate of aspirin 〉50% and an inhibition rate of clopidogrel 〉50% were defined as the control group.Sixty patients with an inhibition rate for aspirin 〈50% and an inhibition rate for clopidogrel 〈50% were defined as the resistance group.Patients in resistance group were randomly assigned to be given a routine dose （100 mg aspirin plus 75 mg clopidogrel per day,which we called a resistance plus routine dose group,R＋R） and a loading dose （200 mg aspirin and 150 mg clopidogrel per day,which we called resistance plus loading dose group,R＋L） of antiplatelet therapy.A 12-month follow-up was observed to examine the change of inhibition rate of antiplatelet therapy and to estimate the relationship between inhibition rate and the occurrence of cardiovascular ischemic events.Results After 6 months of antiplatelet therapy,the inhibition rate of aspirin in the R＋L group increased from （31.4±3.7）% to （68.6±7.1）%,which was significantly higher than that in R＋R group,（51.9±8.2）% （P 〈0.01）.The inhibition rate of clopidogrel in the R＋L group increased from （22.1±3.8）% to （60.2±7.4）%,which was significantly higher than in the R＋R group,（45.9±4.3）% （P 〈0.01）.The occurrence rates of cardiovascular ischemic events,stent thrombosis,recurrent unstable angina and myocardial infarction in the R＋R group were 20%,36% and 17%,respectively.Occurrence was significantly increased compared with that in the control group,3%,10% and 1%,respectively （P 〈0.01）.In contrast,the occurrence rates in the R＋L group （10%,23% and 6%,respectively） were attenuated compared with those in the R＋R group （P 〈0.01 ）,although still higher than in the control group （P 〈0.01）.Conclusions Almost all of the cardiovascular ischemic events occurred in the first six months after percutaneous coronary intervention.According to the result of TEG determinations,earlier application of a loading dose of aspirin and clopidogrel can decrease the rate of recurrent cardiovascular ischemic events.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos.52261038 and 51861002)the Natural Science Foundation of Guangxi Province (Grant No.2018GXNSFAA294125)+1 种基金the Innovation-driven Development Foundation of Guangxi Province (Grant No.AA17204063)support by the Ministry of Science and Higher Education of the Russian Federation in the framework of the Increase Competitiveness Program of NUST "MISiS" (grant number K2-2020-046)。
文摘Hydrogen is considered one of the most ideal future energy carriers.The safe storage and convenient transportation of hydrogen are key factors for the utilization of hydrogen energy.In the current investigation,two-dimensional vanadium carbide(VC) was prepared by an etching method using V_(4)AlC_(3) as a precursor and then employed to enhance the hydrogen storage properties of MgH_(2).The studied results indicate that VC-doped MgH_(2) can absorb hydrogen at room temperature and release hydrogen at 170℃. Moreover,it absorbs 5.0 wt.%of H_(2) within 9.8 min at 100℃ and desorbs 5.0 wt.% of H_(2) within 3.2 min at 300℃.The dehydrogenation apparent activation energy of VC-doped MgH_(2) is 89.3 ± 2.8 kJ/mol,which is far lower than that of additive-free MgH_(2)(138.5 ± 2.4 kJ/mol),respectively.Ab-initio simulations showed that VC can stretch Mg-H bonds and make the Mg-H bonds easier to break,which is responsible for the decrease of dehydrogenation temperature and conducive to accelerating the diffusion rate of hydrogen atoms,thus,the hydrogen storage properties of MgH_(2) are remarkable improved through addition of VC.
文摘【目的】探索集约化和多模式集中办刊思路,解决编务工作内容较为琐碎、各刊间存在大量重复工作、效率低下等问题,实现自动化整合编务工作。【方法】在需求分析的基础上,设计集约化、通用性的作者信息基础模块,利用Visual Basic for Applications(VBA)编程,实现自动化整合编务工作。【结果】实现基于作者信息表批量生成对接银行、单位财务、快递公司的相应信息表单。【结论】所提方法具有较高的可行性和可扩展性,能够提高编务工作效率,并为期刊整合工作提供借鉴。
文摘Background Aspirin and clopidogrel resistance plays a significant role in the development of cardiovascular ischemic events for ninety patients undergoing percutaneous coronary intervention.Recent studies have indicated that increasing the dose of antiplatelet drugs maybe a potent method to improve the inhibition of platelet aggregation.Methods Thrombelastograph （TEG） determinations were used to evaluate the effect of antiplatelet therapy.According to the results,90 patients were divided into three groups and given different doses of aspirin and clopidogrel.Thirty patients with both an inhibition rate of aspirin 〉50% and an inhibition rate of clopidogrel 〉50% were defined as the control group.Sixty patients with an inhibition rate for aspirin 〈50% and an inhibition rate for clopidogrel 〈50% were defined as the resistance group.Patients in resistance group were randomly assigned to be given a routine dose （100 mg aspirin plus 75 mg clopidogrel per day,which we called a resistance plus routine dose group,R＋R） and a loading dose （200 mg aspirin and 150 mg clopidogrel per day,which we called resistance plus loading dose group,R＋L） of antiplatelet therapy.A 12-month follow-up was observed to examine the change of inhibition rate of antiplatelet therapy and to estimate the relationship between inhibition rate and the occurrence of cardiovascular ischemic events.Results After 6 months of antiplatelet therapy,the inhibition rate of aspirin in the R＋L group increased from （31.4±3.7）% to （68.6±7.1）%,which was significantly higher than that in R＋R group,（51.9±8.2）% （P 〈0.01）.The inhibition rate of clopidogrel in the R＋L group increased from （22.1±3.8）% to （60.2±7.4）%,which was significantly higher than in the R＋R group,（45.9±4.3）% （P 〈0.01）.The occurrence rates of cardiovascular ischemic events,stent thrombosis,recurrent unstable angina and myocardial infarction in the R＋R group were 20%,36% and 17%,respectively.Occurrence was significantly increased compared with that in the control group,3%,10% and 1%,respectively （P 〈0.01）.In contrast,the occurrence rates in the R＋L group （10%,23% and 6%,respectively） were attenuated compared with those in the R＋R group （P 〈0.01 ）,although still higher than in the control group （P 〈0.01）.Conclusions Almost all of the cardiovascular ischemic events occurred in the first six months after percutaneous coronary intervention.According to the result of TEG determinations,earlier application of a loading dose of aspirin and clopidogrel can decrease the rate of recurrent cardiovascular ischemic events.
