Mn nanoparticles(nano-Mn)were successfully synthesized and doped into MgH_(2) to improve its de/hydrogenation properties.Compared with MgH_(2),the onset desorption temperature of 10 wt.%nano-Mn modified MgH_(2) was de...Mn nanoparticles(nano-Mn)were successfully synthesized and doped into MgH_(2) to improve its de/hydrogenation properties.Compared with MgH_(2),the onset desorption temperature of 10 wt.%nano-Mn modified MgH_(2) was decreased to 175℃ and 6.7,6.5 and 6.1 wt.%hydrogen could be released within 5,10 and 25 min at 300,275 and 250℃,respectively.Besides,the composite started to take up hydrogen at room temperature and absorbed 2.0 wt.%hydrogen within 30 min at low temperature of 50℃.The hydrogenation activation energy of MgH_(2) was reduced from(72.5±2.7)to(18.8±0.2)kJ/mol after doping with 10 wt.%nano-Mn.In addition,the MgH_(2)+10 wt.%nano-Mn composite exhibited superior cyclic property,maintaining 92%initial capacity after 20 cycles.展开更多
Objective:Acute ischemic stroke(AIS)is characterized by high morbidity and high mortality.In recent years,complementary and alternative medicine has gradually been widely accepted and applied.At present,traditional Ch...Objective:Acute ischemic stroke(AIS)is characterized by high morbidity and high mortality.In recent years,complementary and alternative medicine has gradually been widely accepted and applied.At present,traditional Chinese medicine therapy and standard treatments are used for the treatment of AIS.Xingnao-Jianshen prescriptions(XNJS)is an effective prescription for the clinical treatment of AIS,but there is a lack of large-scale clinical evidence to confirm its clinical efficacy.Therefore,our team designed this protocol to evaluate the initial therapeutic effect of XNJS.Methods:The protocol for a non-randomized controlled trial is designed in which 72 eligible patients will be allocated to one of two groups.The control group(n=36)will receive standard treatment for AIS,the test group(n=36)will receive XNJS and standard treatment.Patients will be recruited after stroke onset and will receive the intervention continuously over 10±1 days,with a follow-up period of 90 days.The primary outcome will be the change in the NIHSS,BI,mRS scores.All outcome measures will be assessed at inception,after the intervention(10±1 days),and at the follow-up(90 days).The results will be disseminated to the public through peerreviewed journals and academic conferences.Discussion:The study will provide evidence of the preliminary effects.展开更多
Electrocatalysis technology can effectively promote the hydrodechlorination of chloramphenicol(CAP)to reduce the bio-toxicity.However,there are still some challenges such as low degradation rate and poor stability.Her...Electrocatalysis technology can effectively promote the hydrodechlorination of chloramphenicol(CAP)to reduce the bio-toxicity.However,there are still some challenges such as low degradation rate and poor stability.Here,we prepared porous N,O co-doped carbon supported Pd nanoparticles composites(Pd NPs/NO-C)for electrocatalytic degradation of CAP.The doping of N and O not only effectively enhanced the interaction between substrate and CAP,promoting the mass transfer process,but also enhanced the anchoring effect on Pd nanoparticles,avoiding the occurrence of aggregation.The prepared composites achieved removal efficiency of CAP over 99%within 1 h,and the rate constant was as high as 6.72 h^(–1),outperforming previous reported electrocatalysts.Additionally,Pd NPs/NO-C composites showed a wide range of pH tolerance,excellent ion interference resistance and long-term stability.Our work unravels the importance of mass transfer processes in solution to electrocatalytic hydrodechlorination and provides new research ideas for catalysts design.展开更多
The interstand tension control is one of the most important ways to meet tight tolerances for strip product quality during tandem cold rolling process. Using coordinate analysis and parabolic approximation for the mas...The interstand tension control is one of the most important ways to meet tight tolerances for strip product quality during tandem cold rolling process. Using coordinate analysis and parabolic approximation for the mass flow balance principle, the strip velocities eliminating the use of forward slips and backward slips were calculated. In order to reduce the effect of roll eccentricity on the tension measurement, a filter based on bilinear transformation was de- signed. Applying a first-order Taylor series approximation, the transfer function matrix model of interstand tension stress was derived. The actual measurements on-site and the final calculation results showed that the established model had high calculation accuracy and was beneficial for interstand tension control of random cold rolling process.展开更多
Rare-earth metal complexes have been used as catalysts for many types of reactions.However,the mechanistic studies showed that basically,these various reactions proceeded withσ-bond metathesis of RE–E bond(RE:rare-e...Rare-earth metal complexes have been used as catalysts for many types of reactions.However,the mechanistic studies showed that basically,these various reactions proceeded withσ-bond metathesis of RE–E bond(RE:rare-earth metals;E:main group elements)or RE ions acting as Lewis acid centers to activate the polar functional groups of the substrates.In this article,a lutetium phosphinophosphinidene complex,with Lu=P double-bond character,was synthesized and structurally characterized.展开更多
基金financial supports from the National Natural Science Foundation of China (No. 51801078)the Natural Science Foundation of Jiangsu Province, China (No. BK20180986)。
文摘Mn nanoparticles(nano-Mn)were successfully synthesized and doped into MgH_(2) to improve its de/hydrogenation properties.Compared with MgH_(2),the onset desorption temperature of 10 wt.%nano-Mn modified MgH_(2) was decreased to 175℃ and 6.7,6.5 and 6.1 wt.%hydrogen could be released within 5,10 and 25 min at 300,275 and 250℃,respectively.Besides,the composite started to take up hydrogen at room temperature and absorbed 2.0 wt.%hydrogen within 30 min at low temperature of 50℃.The hydrogenation activation energy of MgH_(2) was reduced from(72.5±2.7)to(18.8±0.2)kJ/mol after doping with 10 wt.%nano-Mn.In addition,the MgH_(2)+10 wt.%nano-Mn composite exhibited superior cyclic property,maintaining 92%initial capacity after 20 cycles.
基金Changchun Science and Technology Development Project(No.21ZGM32)Natural Science Foundation of Jilin Province(No.20200201412JC).All funds conflict-free.
文摘Objective:Acute ischemic stroke(AIS)is characterized by high morbidity and high mortality.In recent years,complementary and alternative medicine has gradually been widely accepted and applied.At present,traditional Chinese medicine therapy and standard treatments are used for the treatment of AIS.Xingnao-Jianshen prescriptions(XNJS)is an effective prescription for the clinical treatment of AIS,but there is a lack of large-scale clinical evidence to confirm its clinical efficacy.Therefore,our team designed this protocol to evaluate the initial therapeutic effect of XNJS.Methods:The protocol for a non-randomized controlled trial is designed in which 72 eligible patients will be allocated to one of two groups.The control group(n=36)will receive standard treatment for AIS,the test group(n=36)will receive XNJS and standard treatment.Patients will be recruited after stroke onset and will receive the intervention continuously over 10±1 days,with a follow-up period of 90 days.The primary outcome will be the change in the NIHSS,BI,mRS scores.All outcome measures will be assessed at inception,after the intervention(10±1 days),and at the follow-up(90 days).The results will be disseminated to the public through peerreviewed journals and academic conferences.Discussion:The study will provide evidence of the preliminary effects.
基金support received from the Basic Research Project of Leading Technology in Jiangsu Province(BK20202012)the National Natural Science Foundation of China(21938006and 21776190)+1 种基金China Postdoctoral Science Foundation(2020M681714)the Priority Academic Program Development of Higher Education Institutions(PAPD)in Jiangsu.
文摘Electrocatalysis technology can effectively promote the hydrodechlorination of chloramphenicol(CAP)to reduce the bio-toxicity.However,there are still some challenges such as low degradation rate and poor stability.Here,we prepared porous N,O co-doped carbon supported Pd nanoparticles composites(Pd NPs/NO-C)for electrocatalytic degradation of CAP.The doping of N and O not only effectively enhanced the interaction between substrate and CAP,promoting the mass transfer process,but also enhanced the anchoring effect on Pd nanoparticles,avoiding the occurrence of aggregation.The prepared composites achieved removal efficiency of CAP over 99%within 1 h,and the rate constant was as high as 6.72 h^(–1),outperforming previous reported electrocatalysts.Additionally,Pd NPs/NO-C composites showed a wide range of pH tolerance,excellent ion interference resistance and long-term stability.Our work unravels the importance of mass transfer processes in solution to electrocatalytic hydrodechlorination and provides new research ideas for catalysts design.
基金Item Sponsored by Fundamental Research Funds for the Central Universities of China(N110307001)
文摘The interstand tension control is one of the most important ways to meet tight tolerances for strip product quality during tandem cold rolling process. Using coordinate analysis and parabolic approximation for the mass flow balance principle, the strip velocities eliminating the use of forward slips and backward slips were calculated. In order to reduce the effect of roll eccentricity on the tension measurement, a filter based on bilinear transformation was de- signed. Applying a first-order Taylor series approximation, the transfer function matrix model of interstand tension stress was derived. The actual measurements on-site and the final calculation results showed that the established model had high calculation accuracy and was beneficial for interstand tension control of random cold rolling process.
基金supported by the National Natural Science Foundation of China(nos.21732007,21890721,21821002,21890722,and 21950410519)the Natural Science Foundation of Tianjin Municipality(nos.19JCJQJC62300 and 18JCYBJC21400)+2 种基金the Tianjin Research Innovation Project for Postgraduate Students(no.2019YJSB081)the Frontiers Science Center for New Organic Matter[Nankai University(no.63181206)]the K.C.Wong Education Foundation,and the Shanghai Municipal Committee of Science and Technology.
文摘Rare-earth metal complexes have been used as catalysts for many types of reactions.However,the mechanistic studies showed that basically,these various reactions proceeded withσ-bond metathesis of RE–E bond(RE:rare-earth metals;E:main group elements)or RE ions acting as Lewis acid centers to activate the polar functional groups of the substrates.In this article,a lutetium phosphinophosphinidene complex,with Lu=P double-bond character,was synthesized and structurally characterized.
