The performance of a two-state quantum engine under different conditions is analyzed. It is shown that the efficiency of the quantum engine can be enhanced by superposing the eigenstates at the beginning of the cycle....The performance of a two-state quantum engine under different conditions is analyzed. It is shown that the efficiency of the quantum engine can be enhanced by superposing the eigenstates at the beginning of the cycle. By employing the finite-time movement of the potential wall, the power output of the quantum engine as well as the efficiency at the maximum power out- put （EMP） can be obtained. A generalized potential is adopted to describe a class of two-level quantum engines in a unified way. The results obtained show clearly that the performances of these engines depend on the external potential, the geometric configuration of the quantum engines, and the superposition effect. Moreow^r, it is found that the superposition effect will en- large the optimally operating region of quantum engines.展开更多
Objective： To summarize the timing-efficacy relationship and the dosage–efficacy relationship of acupuncture in stroke treatment. Method： Literature research was conducted for quantitative clinical studies of acupu...Objective： To summarize the timing-efficacy relationship and the dosage–efficacy relationship of acupuncture in stroke treatment. Method： Literature research was conducted for quantitative clinical studies of acupuncture in stroke treatment, with the entry point on the timing factor and dosage factor. A hierarchical analysis was performed on observing the time–efficacy relationship and the dosage–efficacy relationship before, during and after acupuncture. Results： Though the retrieved studies differ especially in such timing factors as needle retaining time, acupuncture interval and course, they share an agreement in the acupuncture intervention time point, acupuncture timing, specificity of acupoints and acupuncture manipulation. Conclusion： The optimal stimulation is the core of the research on the timing-efficacy relationship and the dosage–efficacy relationship of acupuncture and also the key to the clinical efficacy.展开更多
Aims Plant invasions have the potential to affect the community structure of soil nematodes,but little is known about whether such effects are mediated by aboveground herbivores since invasive plants are not completel...Aims Plant invasions have the potential to affect the community structure of soil nematodes,but little is known about whether such effects are mediated by aboveground herbivores since invasive plants are not completely released from herbivores in the introduced range.In this study,we explored how aboveground insect herbivores mediated the effect of invasive plant Alternanthera philoxeroides on soil nematodes and examined the temporal variations of such an herbivory-elicited effect.Methods We conducted a greenhouse experiment by applying different herbivory treatments(no insect herbivores,specialist Agasicles hygrophila and generalist Cassida piperata)to potted A.philoxeroides,and then measured the community compositions of soil nematodes in corresponding pots on the 1st,10th and 20th day after removal of all herbivores.In addition,the carbon content of roots and root exudate of A.philoxeroides were also measured.Important Findings Our results showed that aboveground herbivory significantly increased the abundance of soil nematodes of A.philoxeroides,likely plant feeder nematodes,after insect herbivores were removed immediately(1st day).However,such impacts waned with time and there was no significant difference at later stages(10th and 20th days).Furthermore,the effects of specialist A.hygrophila and generalist C.piperata herbivory were consistent on the abundance of soil nematodes.Overall,our results suggest that aboveground insect herbivores have the potential to alter the effects of plant invasions on soil nematodes,but such impacts are transient.Furthermore,our study highlighted the importance of integrating the effects of above-and belowground organisms when evaluating the impacts of plant invasions.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.11005041)the Program for Prominent Young Talents in Fujian Province University(Grant No.JA12001)+2 种基金the Natural Science Foundation of Fujian Province(Grant Nos.2010J05007 and 2011J01012)the Fundamental Research Funds for the Central Universities(Grant No.JB-SJ1005)the Science Research Fund of Huaqiao University(Grant No.09BS510)
文摘The performance of a two-state quantum engine under different conditions is analyzed. It is shown that the efficiency of the quantum engine can be enhanced by superposing the eigenstates at the beginning of the cycle. By employing the finite-time movement of the potential wall, the power output of the quantum engine as well as the efficiency at the maximum power out- put （EMP） can be obtained. A generalized potential is adopted to describe a class of two-level quantum engines in a unified way. The results obtained show clearly that the performances of these engines depend on the external potential, the geometric configuration of the quantum engines, and the superposition effect. Moreow^r, it is found that the superposition effect will en- large the optimally operating region of quantum engines.
基金Supported by Shi Xuemin TCM Master Inheritance Center~~
文摘Objective： To summarize the timing-efficacy relationship and the dosage–efficacy relationship of acupuncture in stroke treatment. Method： Literature research was conducted for quantitative clinical studies of acupuncture in stroke treatment, with the entry point on the timing factor and dosage factor. A hierarchical analysis was performed on observing the time–efficacy relationship and the dosage–efficacy relationship before, during and after acupuncture. Results： Though the retrieved studies differ especially in such timing factors as needle retaining time, acupuncture interval and course, they share an agreement in the acupuncture intervention time point, acupuncture timing, specificity of acupoints and acupuncture manipulation. Conclusion： The optimal stimulation is the core of the research on the timing-efficacy relationship and the dosage–efficacy relationship of acupuncture and also the key to the clinical efficacy.
基金supported by The National Key Research and Development Program of China(2017YFC1200100 to J.D.)the National Natural Science Foundation of China(31822007 to W.H.).
文摘Aims Plant invasions have the potential to affect the community structure of soil nematodes,but little is known about whether such effects are mediated by aboveground herbivores since invasive plants are not completely released from herbivores in the introduced range.In this study,we explored how aboveground insect herbivores mediated the effect of invasive plant Alternanthera philoxeroides on soil nematodes and examined the temporal variations of such an herbivory-elicited effect.Methods We conducted a greenhouse experiment by applying different herbivory treatments(no insect herbivores,specialist Agasicles hygrophila and generalist Cassida piperata)to potted A.philoxeroides,and then measured the community compositions of soil nematodes in corresponding pots on the 1st,10th and 20th day after removal of all herbivores.In addition,the carbon content of roots and root exudate of A.philoxeroides were also measured.Important Findings Our results showed that aboveground herbivory significantly increased the abundance of soil nematodes of A.philoxeroides,likely plant feeder nematodes,after insect herbivores were removed immediately(1st day).However,such impacts waned with time and there was no significant difference at later stages(10th and 20th days).Furthermore,the effects of specialist A.hygrophila and generalist C.piperata herbivory were consistent on the abundance of soil nematodes.Overall,our results suggest that aboveground insect herbivores have the potential to alter the effects of plant invasions on soil nematodes,but such impacts are transient.Furthermore,our study highlighted the importance of integrating the effects of above-and belowground organisms when evaluating the impacts of plant invasions.
