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.

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.

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.

The general process of ecological restoration, however, may be explained by the critical threshold theory, and state and transition model from successional perspective.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.