Tunable anisotropic magnetism in trapped two-component Bose gases

We theoretically address magnetic ordering at zero and finite temperature in both homogeneous and trapped Bose-Bose mixtures in optical lattices. By using Bosonic Dynamical Mean-Field Theory, we obtain the phase diagram of the homogeneous two-component Bose-Hubbard model in a three-dimensional (3D) cubic lattice, which features competing magnetic order of XY-ferromagnetic and anti-ferromagnetic type in addition to the Mott and superfluid states. We show that these magnetic phases persist also in the presence of a harmonic trap.Comment: 10 pages, 13 figure

Neonatal meningitis caused by streptococcus pneumonia in Iran

Meningitis, pneumonia, and sepsis in newborns and young infants (age<60 days) are the main causes of childhood mortality in developing countries. Even though streptococcus pneumonia is the most commonly detected microorganism in pediatric bacterial meningitis, it is rare in newborn infants. The following article reports a case of pneumococcal meningitis that was detected early in a newborn infant in 2013. A female baby was born by vaginal delivery with a birth weight of 2900 grams. She was symptomatic (poor feeding) from her first day of life, but she was admitted with a toxic status (dehydrated, lethargic, cyanotic, hypo tone, hypo reflex) to our referral center on her third day life. Her blood culture showed no growth of any organism and her urine culture was also negative, but the Cerebrospinal fluid (CSF) culture showed growth of streptococcus pneumonia. The maternal sepsis workup was normal. Despite all therapeutic management, unfortunately, the patient died on her fourth day after admission

Pomeranchuk effect and spin-gradient cooling of Bose-Bose mixtures in an optical lattice

We theoretically investigate finite-temperature thermodynamics and demagnetization cooling of two-component Bose-Bose mixtures in a cubic optical lattice, by using bosonic dynamical mean field theory (BDMFT). We calculate the finite-temperature phase diagram, and remarkably find that the system can be heated from the superfluid into the Mott insulator at low temperature, analogous to the Pomeranchuk effect in 3He. This provides a promising many-body cooling technique. We examine the entropy distribution in the trapped system and discuss its dependence on temperature and an applied magnetic field gradient. Our numerical simulations quantitatively validate the spin-gradient demagnetization cooling scheme proposed in recent experiments.Comment: 9 pages, 8 figure

Dynamical arrest of ultracold lattice fermions

We theoretically investigate the thermodynamics of an interacting inhomogeneous two-component Fermi gas in an optical lattice. Motivated by a recent experiment by L. Hackerm\"uller et al., Science, 327, 1621 (2010), we study the effect of the interplay between thermodynamics and strong correlations on the size of the fermionic cloud. We use dynamical mean-field theory to compute the cloud size, which in the experiment shows an anomalous expansion behavior upon increasing attractive interaction. We confirm this qualitative effect but, assuming adiabaticity, we find quantitative agreement only for weak interactions. For strong interactions we observe significant non-equilibrium effects which we attribute to a dynamical arrest of the particles due to increasing correlations.Comment: 4.5 pages, 5 figures (slightly different from published version

MARKOV CHAIN MODEL FOR PROBABILITY OF DRY, WET DAYS AND STATISTICAL ANALISIS OF DAILY RAINFALL IN SOME CLIMATIC ZONE OF IRAN

Water scarcity is a major problem in arid and semi-arid areas. The scarcity of water is further stressed by the growing demand due to increase in population growth in developing countries. Climate change and its outcomes on precipitation and water resources is the other problem in these areas. Several models are widely used for modeling daily precipitation occurrence. In this study, Markov Chain Model has been extensively used to study spell distribution. For this purpose, a day period was considered as the optimum length of time. Given the assumption that the Markov chain model is the right model for daily precipitation occurrence, the choice of Markov model order was examined on a daily basis for 4 synoptic weather stations with different climates in Iran (Gorgan, Khorram Abad, Zahedan, Tabriz)during 1978-2009. Based on probability rules, events possibility of sequential dry and wet days, these data were analyzed by stochastic process and Markov Chain method. Then probability matrix was calculated by maximum likelihood method. The possibility continuing2-5days of dry and wet days were calculated. The results showed that the probability maximum of consecutive dry period and climatic probability of dry days has occurred in Zahedan. The probability of consecutive dry period has fluctuated from 73.3 to 100 percent. Climatic probability of occurrence of dry days would change in the range of 70.96 to 100 percent with the average probability of about 90.45 percent

Bakhtiari, Leskinen and Torma Reply

This is a Reply to: Comment on "Spectral Signatures of the Fulde-Ferrell-Larkin-Ovchinnikov Order Parameter in One-Dimensional Optical Lattices" R. A. Molina J. Dukelksy, and P. Schmitteckert, Phys. Rev. Lett. 102, 168901 (2009)Comment: 1 page, published versio

Application of rapid environmental impacts assessment matrix and Iranian matrix in environmental impact assessment of solid waste landfill of Shahrekord

زمینه و هدف: یکی از مهمترین معضلات محیط زیستی تولید بیش از اندازه مواد زائد جامد شهری و مدیریت این مواد است. ارزیابی اثرات محیط زیستی (Environmental Impact Assessment= EIA) به عنوان راهکاری جهت به حداقل رساندن اثرات منفی دارای اهمیت است. هدف از این مطالعه استفاده از فرآیند EIA برای به حداقل رساندن اثرات محیط زیستی محل دفن زباله های شهرکرد و ارائه گزینه مناسب برای مدیران و برنامه ریزان این شهر بود. روش بررسی: در این مطالعه توصیفی-تحلیلی ارزیابی اثرات محیط زیستی محل دفن پسماند جامد شهرکرد در سال 1391 با دو روش ماتریس ارزیابی سریع اثرات محیط زیستی (Rapid Impact Assessment Matrix= RIAM) و ماتریس ایرانی (ماتریس اصلاح شده لئوپولد) مبتنی بر بازدیدهای میدانی و جمع آوری اطلاعات از منابع متعدد انجام شد. مقایسه چهار گزینه موجود شامل ادامه دفن به شیوه کنونی، ارتقاء کیفیت دفن، احداث محل دفن بهداشتی جدید و احداث کارخانه کمپوست و بازیافت انجام شد. یافته ها: ادامه روند کنونی دفن دارای امتیاز در RIAM، 1443- و در ماتریس ایرانی 9/3- بود. امتیاز گزینه کمپوست بازیافت در RIAM، 816- و در ماتریس ایرانی 1 برآورد شد. همچنین در نتایج دو روش برای اولویت گذاری ارتقاء کیفیت دفن و احداث محل دفن بهداشتی اختلاف مشاهده شد. نتیجه گیری: بر اساس هر دو روش، ادامه دفن به شیوه کنونی از لحاظ بهداشتی غیر قابل قبول و ادامه روند کنونی همراه با آسیب های محیط زیستی شدید است. کارخانه کمپوست-بازیافت با توجه به پتانسیل پسماندهای تولیدی در این شهر در اولویت گزینه های موجود قرار دارد