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临界阈值
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  critical threshold
     A series of patterns and their fractal dimensions are obtained for three near neighbor conditions. The simulated structures are similar to those of porous silicon. The properties of the D X curve and the critical threshold of the cluster change from fractal to uniform structure are also discussed briefly.
     建立了一种一维随机成核生长模型,在三种不同的近邻条件下进行模拟,得到了一系列聚集生长图形,并计算了相应的分形维数.所得图形与多孔硅形成图样相似.对分形维数D随生长概率X变化的DX曲线性质以及分形结构转变为均匀结构的临界阈值等作了初步的讨论
短句来源
     When P is equal to the critical threshold value Pc, aggregate begins to grow infinitely uniformly and does not keep its fractal structure.
     4、当生长概率p=Pc时,凝聚体开始均匀地无限生长,不再具有分形结构; 此时的Pc即为凝聚体由分形结构向均匀结构转变的临界阈值
短句来源
     An analysis is made for the initial current, the operation current limit, and the critical threshold current of the injection laser at continuous and pulse operation conditions.
     本文直接利用阈值电流随温度变化的实验关系,通过解热传导方程,得到了连续及脉冲工作状态下起始工作电流、最大工作电流及临界阈值电流的定量结果,供研制参考。
短句来源
     An approach used to determine the critical threshold of the detection for weak signals is presented, that is the Lyapunov exponents is employed in the field of weak signal detection based on chaos, which provides a criteria for chaotic detection on quantity.
     提供一种微弱信号混沌检测中临界阈值的判定方法. 将Lyapunov特性指数作为混沌判据引入了微弱信号混沌检测领域,为混沌检测提供了一种量上的判据.
短句来源
     The general process of ecological restoration, however, may be explained by the critical threshold theory, and state and transition model from successional perspective.
     由于生态系统的复杂性 ,退化生态系统恢复的方向和时间具有不确定性 ,其恢复的机理可用临界阈值理论和状态跃迁模型进行解释。
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  critical value
     The shoot growing length showed positive response to higher osmotic potential (≥-0.3 MPa), but the root growing length showed negative response to all osmotic potential (-0.1~-1.5 MPa) in Na 2SO 4. The seed also showed a strong resistance to the drought stress, and the critical value for germination was -1.04 MPa in PEG 6 000 solution.
     高渗透势 Na2 SO4 盐胁迫 (≥ - 0 .3MPa)下 ,胚芽长度递增为正效应 ,Na2 SO4 盐胁迫对胚根的影响呈单一负效应。 布顿大麦种子有较强的抗旱性 ,其萌发期抗旱临界阈值为 - 1.0 4 MPa;
短句来源
     The critical value of f(s) is related to theself-organized threshold f~ through an exact equation: fc = (1 + f~)/2.A new hierarchy of avalanches, LC avalanche, is observed through theaverage fitness.
     f(s)的临界值f_c与自组织临界阈值f_c之间有一个精确的关系:f_c=(1+f_c)/2。
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     The [AKX-]-chart is used to estimate the critical value of the nugget quality by analyzing the database information, and the critical value is feed back to the on-line monitoring system.
     数据库信息为在线监测系统提供参数优化数据源,通过均值控制图法实现对在线监测系统焊点质量判定临界阈值的优化。
短句来源
  “临界阈值”译为未确定词的双语例句
     An algorithm based on Lyapunov exponents to determine the threshold of chaotic detection for weak signal
     微弱信号混沌检测临界阈值的Lyapunov指数算法
短句来源
     The seed had resistance to salt stress, and the resistance to the NaCl was higher than Na 2SO 4. The critical salt stress value for germination was -1.01 MPa in NaCl and -0.83 MPa in Na 2SO 4. Both shoot and root growing length showed positive response to higher osmotic potential (≥-0.3 MPa) in NaCl.
     种子萌发期耐盐临界阈值为 - 1.0 1MPa(Na Cl)和 - 0 .83MPa(Na2 SO4 ) ; 高渗透势 Na Cl盐胁迫 (≥ - 0 .3MPa)下 ,胚芽和胚根长度均递增为正效应 ;
短句来源
     The peach buds were induced to enter the endodormancy when the ratio of GA3 and ABA was higher than that critical point, otherwise the endodormancy will not be induced.
     而且这种平衡变化存在一个临界阈值,GA3/ABA比值高于这个临界阈值,则不诱导桃植株进入休眠,反之则诱导桃植株进入休眠。
短句来源
     1.2 The dormancy induction of peach tree was regulated by balanceable change of ABA and GA3, not by ABA or GA3 alone, and there is an important control point in this balanceable change, the peach tree was induced to enter the endodormancy status when the ratio of GA3 and ABA was lower than this control point, whereas the peach plant bud was not induced to development dormancy.
     1.2脱落酸(ABA)和赤霉素(GA3)均参与桃芽自然休眠的诱导,通过两者的平衡变化调节桃芽自然休眠的启动。 这种平衡变化存在一个临界阈值,GA3/ABA低于此临界阈值则诱导桃芽进入自然休眠,反之则桃芽不进入自然休眠。
短句来源
     At present,the research can be provided as an efficient reference and also a guidance to the design and construction for some major projects.
     确定软岩性质软化的标志性临界阈值,为建立水-岩相互作用理论体系奠定软岩研究基础,为重大工程的设计、施工等提供有效的参考和指导。
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  critical threshold
The results indicate that the infection delay will promote the epidemic outbreaks, increase the prevalence and reduce the critical threshold of epidemic spreading.
      
???We found a limit of 20000 μg/l myoglobin as critical threshold for the occurrence of apparent organ failure.
      
On reaching the critical threshold concentration, AIs bind to specific receptor regulatory proteins, which induce the expression of target genes.
      
We show that for intensities beyond the critical threshold an increasing number of modes provide further contributions (subharmonics) to the space inhomogeneity.
      
It is not a question of measuring a critical threshold value of Reynolds number of transition but only to estimate the degree of turbulence in the transition regime, i.e.
      
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  critical value
When β is less than some critical value the boundary periodic solution (xs(t), 0, zs(t)) is locally stable, and when β is larger than the critical value there are periodic oscillations in substrate, prey and predator.
      
Also, there is a critical size for the pore; when the pore size is larger than the critical value, the fatigue strength decreases sharply.
      
When the thickness reaches a critical value (6 mm) and then increases, the stress increases slightly and even to a stable value.
      
When the initial concentration exceeds a certain critical value, almost steady-state translational droplet motion occurs in addition to oscillation displacements.
      
The notions of percolation theory were used to determine the critical value of the ratio of interfacial and grain boundary energies which provide the liquid-phase inclusions to form the network penetrating polycrystals of any size.
      
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An analysis is made for the initial current, the operation current limit, and the critical threshold current of the injection laser at continuous and pulse operation conditions. Both the heat generated at junction and bulk heat generation have been taken into account simultaneously, the later can be characterized with a normalized equivalent bulk heating resistance r. For the continuous operation case, it is shown that the bulk heat generation cannot often be neglected. In the analysis for pulse operation case,...

An analysis is made for the initial current, the operation current limit, and the critical threshold current of the injection laser at continuous and pulse operation conditions. Both the heat generated at junction and bulk heat generation have been taken into account simultaneously, the later can be characterized with a normalized equivalent bulk heating resistance r. For the continuous operation case, it is shown that the bulk heat generation cannot often be neglected. In the analysis for pulse operation case, the effect of pulse duration and that of repetition frequency have been considered respectively. It is indicated that when both the high power and high repetition frequency operation are desirable, it will be optimum to choose the duty cycle approach to 0.03. In some applications where the repetition frequency is not an important factor, to make the repetition period just three times larger than the thermal relaxation time of lasers is suitable. As the repetition frequency increased sufficiently, the performance of lasers is determined by the duty cycle mainly. Examples of the analysis applied to some typical cases have been illustrated and the emission spectral band broadening originated from junction temperature variation during pulse operation is briefly discussed.

本文直接利用阈值电流随温度变化的实验关系,通过解热传导方程,得到了连续及脉冲工作状态下起始工作电流、最大工作电流及临界阈值电流的定量结果,供研制参考。其中全面地考虑了结内及体内发热的贡献,后者可用一归一化等效体内发热电阻r来表征。连续工作状态的分析表明,体内发热的影响不可忽略。对脉冲工作状态的分析,分别考虑了脉冲宽度和重复频率的影响。指出:在兼顾功率和重复频率的情况下,脉冲工作比以取0.03左右为宜。当实际应用中对重复频率要求不高时,为了提高功率,取重复周期比二极管热弛豫时间约大3倍比较合适。如果要求重复频率很高,则器件性能主要由脉冲工作比决定。文中利用所得结果结合实例进行了讨论,并讨论了脉冲工作情况由于结温变化所导致的发射频谱展宽效应。

The design process of contact screens have been investigated. An advanced knowledge of the threshold transmittance is essential for design of reliable screens. Following the theoretical guideline a logarithmic, an exponential and a fidelity contact screen have been designed and fabricated. Experimental results on screen performance are also presented.

本文研究了用于印刷和书画艺术复印工业中的密着网屏的设计方法.为了设计可靠而实用的网屏,最重要的是预先了解临界(阈值)透射率.作者以一维网屏为例,分析了密着网屏的网目透射率空间变化函数.根据这一理论分析,设计并制作了对数、指数和保真的密着网屏.文章最后给出了网屏性能的实验结果.

This paper studies the small finite axisymmetrical disturbance in a Poiseuille flow in a circular pipe. The results indicate that the finite amplitude disturbance is stable and no threshold amplitude is present.

本文采用[1]中人为中性方法研究圆管Poiseuille流对有限幅值轴对称小扰动的稳定性。发现圆管流对轴对称有限扰动总是稳定的,不存在平衡意义上的临界阈值

 
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