نتایج جستجو برای: expansion ratio
تعداد نتایج: 637146 فیلتر نتایج به سال:
Based on a six eo-channel interference model, this paper examines the effect of bandwidth expansiodspectrum spreading beyond the baseband, on the spectral efficiency of wideband and spread spectrum cellular systems. The improvement in the signal to noise ralio/protection ratio as a result of bandwidth expansion is considered. The advantage in the protection ratio combined with the resulting exp...
BACKGROUND AND PURPOSE Acute leukocytosis is a well-established response to intracerebral hemorrhage (ICH). Leukocytes, because of their interaction with platelets and coagulation factors, may in turn play a role in hemostasis. We investigated whether admission leukocytosis was associated with reduced bleeding after acute ICH. METHODS Consecutive patients with primary ICH were prospectively c...
Effect of temperature on formability of AA6063 aluminum tubes in incremental forming process was investigated. Experiments are performed on AA6063 aluminum tubes. A spirally moving tool incrementally expands the tube wall. The tube is clamped from both ends while the deformation zone is not in contact with the die. A circumferential heating system is used to heat the tube due to the low formabi...
BACKGROUND Supratentorial diffuse low-grade gliomas present a slow macroscopic tumor growth that can be quantified through the measurement of their velocity of diametric expansion. We assessed whether spontaneous velocity of diametric expansion can predict long-term outcomes as a categorical variable and as a continuous predictor. METHODS A total of 407 adult patients with newly diagnosed sup...
The effects of salinity and complementary silicon on some morphological traits of canola, cv. Talaiie, an experiment was done in greenhouse. Treatments were four levels of potassium silicate (0, 1, 2 and 3mM) and four levels of chloride sodium (0, 0.3, 0.6 and 0.9 g/kg soil). In normal condition application of silicon had not a significant effect on measured traits. Salinity decreased leaf area...
A fully irreducible outer automorphism φ of the free group Fn of rank n has an expansion factor which often differs from the expansion factor of φ. Nevertheless, we prove that the ratio between the logarithms of the expansion factors of φ and φ is bounded above by a constant depending only on the rank n. We also prove a more general theorem applying to an arbitrary outer automorphism of Fn and ...
The ow elds in two-dimensional channels with discontinuous expansions are studied numerically to understand how the channel expansion ratio in uences the symmetric and non-symmetric solutions that are known to occur. For improved con dence and understanding, two distinct numerical techniques are used. The general ow eld characteristics in both symmetric and asymmetric regimes are ascertained by...
Abstract Objectives A mechanical metamaterial is introduced herein by drawing inspiration from an Aztec geometric pattern. This deformation mechanism for Poisson’s ratio and Young’s modulus based on non-rotating rhombi with rotating triangles, while the shear analysis hence ‘partially rigid units’. Methods The coefficient of thermal expansion was obtained equating potential energy expressions s...
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