نتایج جستجو برای: توابع hf
تعداد نتایج: 31533 فیلتر نتایج به سال:
Background and purpose: Heart failure (HF) is a serious issue concerning public health in all countries. Assessment and monitoring of mortality and influencing factors are of great importance in HF treatment programs. This study was conducted to determine the incidence of HF and the associated factors in Iran. Materials and methods: In this study, we did two main, independent analyses. One was...
Background and Aim: The aim of this study was to investigate the shear bond strengthof composite to Emax porcelain using different methods of ceramic surface preparation (in vitro). Material and Methods: In this laboratory study, 36 porcelain disks were made and divided into four equal groups. The first group was prepared by sandblasting with 50 micron alumina particles, in the second group rec...
This paper presents a solution to increase the throughput of an HF (High Frequency) physical (PHY) layer in particular to allow for services such as IP over HF. Additionally, this new PHY layer can improve the adaptability of the waveform to the channel variations, in particular to limit the retransmissions due to errors. Taking into consideration the existing HF spectrum occupancy and its high...
در این پروژه ساختار تمامی هم صورت های ممکن مولکول دی فرمیل سیکلوپنتا دی ان در روش های hf، b3lyp و mp2 و با توابع پایه6-31g(d,p) و 6-311++g(d,p) بهینه شده اند، و محاسبات فرکانس با استفاده از روشhf با توابع پایه ذکر شده برای تمامی هم صورت ها انجام گرفته است. برای حصول نتایج دقیق تر، روش ترکیبی cbs-4m نیز برای بهینه سازی ساختارهای فوق مورد استفاده قرار گرفته است. نتایج محاسبات نظری نشان داد که ...
conclusions: thus, identifying the hf patients before the flight and providing them proper education about the events that may occur during flight is necessary. results: hf patients are more prone to experience respiratory distress, anxiety, stress, cardiac decompensation, and venous thromboembolism (vte) during air travel. although stable hf patients can tolerate air travel, but those with acu...
یکی از روش های مؤثر در شناسایی منابع رسوب و فرسایش، شناسایی سازندهای حساس به فرسایش در حوضه می باشد که این امر را می توان با استفاده از روش ردیابی ژئوشیمیایی انجام داد. در این پژوهش با توجه به رسوبزایی بالای بخش جنوب غربی حوزه آبخیز دریاچه زریوار و وجود سازه های آبخیزداری احداث شده در این محدوده، نمونه های رسوب ریزدانه با استفاده از روش ردیابی ژئوشیمیایی مورد بررسی قرار گرفت. با استفاده از این...
in this study a new minimum lumped electrical model of total circulatory system through numerical solutions to approximate the response of the human circulatory system was presented. among five existent ventricular elastances as activity function of heart pumps, a more accurate model was chosen as well as the operation of baroreflex system to accommodate variations in heart rate and systemic va...
the acidity constants (pka) of thirty four (34) ;-substituted carboxylic acids in aqueous solution havebeen calculated using conductor-like polarizable continuum (c-pcm) solvation model. the gasphaseenergies at the density functional theory (dft-mpw1pw91) and solvation energies athartree fock (hf) are combined to estimate the pka values which are very close to the experimentalvalues where, and ...
nowadays nmr spectroscopy becomes a powerful tool in chemistry because of the nmr chemical shifts. hartree–fock theory and the gauge-including atomic orbital (giao) methods are used in the calculation of 29si nmr chemical shifts of various silicate species in the silicate solution as initial components for zeolite synthesis both in gas and solution phase. calculations have been performed at geo...
Abstract Background: Due to the relationship between air pollution and occurrence of de-novo heart failure (HF) or decompensation of symptoms of HF, we aimed to evaluate such relationship in HF admissions in Isfahan hospitals. Materials and methods: This case-crossover study is performed on 120 patients with mean age of 65.9±10.4 (45-86 years old) from cases referred to hospitals, which resulte...
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