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در این تحقیق به‌منظور برآورد تابع تقاضای خدمات اینترنت در بخش خانگی مناطق شهری ایران از فرم تبعی سیستم معادلات تقاضای تقریباً ایده‌آل استفاده شده است. این مدل با استفاده از داده‌های تلفیقی و روش رگرسیون‌های به‌ظاهر نامرتبط و به‌کارگیری اطلاعات 131744 خانوار شهری در کشور و هم‌چنین، گروه‌بندی کالاهای موردمصرف خانوار به پانزده گروه کالایی مرتبط با اینترنت طی سال‌های 1387 تا 1393 تخمین زده شده است. ...
The observed Magellanic Cloud (MC) Cepheid data pose a new challenge to both stellar structure and stellar evolution. The Fourier analysis of the LMC and SMC data indicate that the 2;1 resonance (P 2 /P 0 5 0.5) between the fundamental mode of pulsation and the second overtone occurs with a period P 0 of 210 days, just as in our Galaxy. The implications of this resonance are difficult to reconc...
In this letter we demonstrate, in an elementary manner, that given a partition of the single particle Hilbert space into orthogonal subspaces, a Fermi sea may be factored into pairs of entangled modes, similar to a BCS state. We derive expressions for the entropy and for the particle number fluctuations of a subspace of a Fermi sea, at zero and finite temperatures, and relate these by a lower b...
We construct solar models with the newly calculated radiative opacities from the Opacity Project (OP) and with recently determined (lower) heavy-element abundances. We compare the results from the new models with the predictions of a series of models that use OPAL radiative opacities, older determinations of the surface heavyelement abundances, and refinements of nuclear reaction rates. For all...
We consider the pumping of the 63.2 mm fine-structure line of neutral O i in the high-redshift intergalactic medium (IGM), in analogy with the Wouthuysen-Field effect for the 21 cm line of cosmic H i. We show that the soft UV background at ∼1300 can affect the population levels, and if a significant fraction of the IGM volume is filled Å with “fossil H ii regions” containing neutral O i, then t...
Purpose: The serine/threonine kinase inhibitor flavopiridol targets multiple cyclin-dependent kinases, induces checkpoint arrest, and interrupts transcriptional elongation.We designed aphase I clinical trial using a timed sequential therapy approachwhere flavopiridol was given for the dual purpose of initial cytoreduction and enhancing cell cycle progression of the remaining leukemia cell cohor...
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