助手标题
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
共[87998]条 当前为第1条到20条[由于搜索限制,当前仅支持显示前5页数据]
 

相关语句
period
Let 0≤g be a dyadic H?lder continuous function with period 1 and g(0)=1, and let.
      
The survival probability in finite time period in fully discrete risk model
      
To some two-period economies with countable infinite state spaces, the existence of expectation equilibrium of real asset economies with transaction costs is given.
      
Epidemiologic model of SIS type has a delay corresponding to the infectious period and disease-related deaths, so that the population size is variable.
      
This paper considers an SEIS epidemic model with infectious force in the latent period and a general population-size dependent contact rate.
      
The same qualitative results are obtained provided the threshold is more than unity for the corresponding SEIS model with no infectious force in the latent period.
      
Increasing the impulsive period τ, the system undergoes a series of period-doubling bifurcation leading to chaos, which implies that the dynamical behaviors of the periodically pulsed ratio-dependent predator-prey ecosystem are very complex.
      
Two perturbation results on the linear differential function f″ + Π(z)A(z)f = 0 are obtained, where Π(z) and A(z) are periodic entire functions with period 2πi and σe(Π) >amp;lt; σe(A).
      
The results show that low concentrations of NO were self-produced by marine algae during the exponential growth period and were about nmol/L level.
      
But at the end of the period, i.e., 2 or 3 days before the cell density reaches the maximum, an NO peak appeared, with the NO concentration reaching 10 nmol/L.
      
As a result, the boundaries between the surface crystals become a little larger with prolonging the period of ageing time.
      
However, a ripple current occurs in the inactive phase due to the diode freewheeling during the non-commutation period in the traditional pulse width modulation (PWM) methods, which aggravates the torque ripples.
      
A new PWM method is proposed in this paper to eliminate the diode freewheeling during the non-commutation period in the inactive phase.
      
In addition, there are only two design parameters, which are the predictive period and control order, so it is easy to implement and test in practical use.
      
A function of synchronous superposition of object complex amplitude reconstructed from N-step phase-shifting through one integral period (N-step phase-shifting function for short) was proposed.
      
The experiment shows that the method can efficiently extract the frequency of a period-change radio frequency signal in a complex pulses environment and reveals a new feature for the signal sorting of interleaved radar pulse serial.
      
A new frequency-selective surface (FSS) with loadings is introduced in this paper and analyzed by way of period moment methods (PMMs).
      
euphratica leaves exhibited a higher capacity to exclude salt in a longer period of increasing salinity, thus limited salt-induced lipid peroxide and MP, which contributed to membrane integrity maintenance and salt tolerance of P.
      
Concentrations of N, Ca and Mg gradually increased and those of P and K gradually decreased in the fine roots of poplar during the period of decomposition.
      
A bottleneck in sexual propagation appeared at the stage from seed to seedling, while in clonal propagation it appeared during the period from an asexual plantlet to a ramet.
      
 

首页上一页12345下一页尾页 

 
CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社