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Ground state properties of the S = 1/2 frustrated Heisenberg chain with period 3 exchange modulation are investigated using the numerical diagonalization and DMRG method. It is known that this model has a magnetization plateau at 1/3 of the saturation magnetization M s. On the other hand, the ground state is ferrimagnetic even in the absence of frustration if one of the nearest neighbour bond i...
سندرم روده تحریک پذیر یکی از شایع ترین اختلالات عملکردی دستگاه گوارش است که علت آن نامشخص می باشد. تحقیقات نشان می دهند که بین این سندرم و عوامل اجتماعی ، رابطه وجود دارد. هدف از این پژوهش، بررسی نسبت شانس عوامل اجتماعی مختلف در افراد مبتلا به سندرم روده تحریک پذیر در مقایسه با گروه کنترل می باشد. روش کار : این مطالعه تحلیلی- مقطعی بر 130 نفر از بیماران مبتلا به سندرم روده تحریک پذیر با معیار ...
Dynamic Ratcheting (DR) is a nonlinear dynamic phenomenon occurring in hysteretic damping systems. It means the structural plastic deformation increases asymmetrically in successive cycles under an earthquake excitation. Although it is generally recognized that DR is closely related to the frequency contents of an earthquake excitation applied to thestructure, no targeted analysis has bee...
Introduction: The main task of the emergency medical system is to provide primary care and transfer the injured to a medical center. Studies have been conducted to investigate the outcome of helicopter and ground ambulance casualties, but they show different results. These different results may be due to the type of study, statistical methods, differences in pre-hospital emergency systems, an...
Feed intake, digestion and digesta characteristics of cattle fed bermudagrass (BG) or orchardgrass (OG) alone or with supplemental ground corn or barley were determined in two 6 x 6 latin squares with 2 x 3 factorial treatment arrangements. In Exp. 1, beef cows (Hereford, Angus and Hereford-Angus; 452 kg) cannulated in the rumen and duodenum were fed BG (7.9% CP, 79% NDF and 8.7% ADL) or OG (9....
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