Asymptotic Behavior of Solutions for the Cauchy Problem of a Dissipative Boussinesq-Type Equation

We consider the Cauchy problem for an evolution equation modeling bidirectional surface waves in a convecting fluid. Under small condition on the initial value, the existence and asymptotic behavior of global solutions in some time weighted spaces are established by the contraction mapping principle

Correlation of quality of sleep or quality of life and some of blood factors in hemodialysis patients

چکیده: زمینه و هدف: علی رغم پیشرفت‌های زیادی که در درمان بیماری نارسایی مزمن کلیه صورت گرفته کیفیت زندگی به عنوان یک مشکل بزرگ در این گروه از بیماران به مخاطره افتاده است. با توجه به شیوع بالای اختلال خواب و مشکلات وابسته به آن در بیماران دیالیزی، این مطالعه با هدف بررسی ارتباط بین کیفیت خواب، کیفیت زندگی و بعضی فاکتورهای خونی در بیماران تحت درمان با همودیالیز نگهدارنده انجام شد. روش بررسی: این پژوهش یک مطالعه توصیفی- تحلیلی است که در 85 بیمار تحت درمان با همودیالیز نگه دارنده در سال 84- 83 انجام گرفته است. نمونه ها از بخش های همودیالیز سه بیمارستان آموزشی وابسته به دانشگاه علوم پزشکی تهران و ایران و براساس نمونه گیری مبتنی بر هدف انتخاب شدند. کیفیت خواب با استفاده از پرسشنامه کیفیت خواب پیتس برگ (PSQI) و کیفیت زندگی با استفاده از پرسشنامه کوتاه 36 سوالی (SF36) اندازه‌گیری شد. جهت تجزیه و تحلیل داده ها از آزمون های آماری t، من ویتنی، کای دو، تست دقیق فیشر و ضریب همبستگی اسپیرمن استفاده شد. یافته ها: 63 بیمار (71) کم می خوابیدند (نمره کل کیفیت خواب بیشتر از 5 بود). ابعاد روانی (MCS) و ابعاد فیزیکی (PCS)، ‌ارتباط معکوسی با نمره کل کیفیت خواب داشت (01/0

Einstein-Born-Infeld on Taub-NUT Spacetime in 2k+2 Dimensions

We wish to construct solutions of Taub-NUT spacetime in Einstein-Born-Infeld gravity in even dimensions. Since Born-Infeld theory is a nonlinear electrodynamics theory, in leads to nonlinear differential equations. However a proper analytical solution was not obtain, we try to solve it numerically (by the Runge-Kotta method) with initial conditions coinciding with those of our previous work in Einstein-Maxwell gravity. We solve equations for 4, 6 and 8 dimensions and do data fitting by the least-squares method. For N=l=b=1, the metric turns to the NUT solution only in 8 dimensions, but in 4 and 6 dimensions the spacetime does not have any Nut solution.Comment: 8 pages, 5 figure

Quality of life among patients with beta-thalassemia major in Shahrekord city, Iran

Background and aims: Nowadays introduction of regular blood transfusion therapy has obviously improved the life expectancy of patients with thalassemia. However, these patients face with newer challenges which influence their quality of life (QoL). In this study, the aim of this study was to measure QoL among patients with β-thalassemia major (β-TM). Methods: A cross-sectional study was done at the thalassemia centre of Shahrekord University of Medical Sciences. All the forty patients with β-thalassemia which were more than 12 years old referred to blood transfusion and participated in this study. Then, they were asked to fill out the Short Form Health Status Survey (SF-36) questionnaire. The questionnaire evaluates 8 health areas including physical functioning (PF), rolephysical (RP), bodily pain (BP), general health (GH), vitality (VT), social functioning (SF), role-emotional (RE) and mental health (MH). The scores of each participant were calculated and data were analyzed using SPSS. Results: There were 18 men and 22 women, and the mean age was 21.69±5.74 years (range 12-38). No significant difference was seen in QoL between men and women (68.72±19.79 versus 67.47±18.80, P=0.84). The mean±SD score of PF, RP, BP, GH, VT, SF, MH was 80.5±16, 83.75±29.17, 71.94±24.22, 57.48±23.93, 54.36±22.51, 68.94±23.37, 66.33±36.04 and 58.51±23.68, respectivly. No significant differences were detected in all mentioned scores between men and women (P>0.05). Conclusion: Although most of the participants had suitable physical functioning, thalassemia had a negative effect on emotional role, social functioning and mental health of patients. It shows the importance of psychosocial supports for these patients

The determination of acetaminophen using a carbon nanotube: graphite-based electrode

The oxidation of acetaminophen was studied at a glassy carbon electrode modified with multi-walled carbon nanotubes and a graphite paste. Cyclic voltammety, differential pulse voltammetry and square wave voltammetry at various pH values, scan rates, and the effect of the ratio of nanotubes to graphite were investigated in order to optimize the parameters for the determination of acetaminophen. Square wave voltammetry is the most appropriate technique in giving a characteristic peak at 0.52 V at pH 5. The porous nanostructure of the electrode improves the surface area which results in an increase in the peak current. The voltammetric response is linear in the range between 75 and 2000 ng.mL−1, with standard deviations between 0.25 and 7.8%, and a limit of detection of 25 ng.mL−1. The method has been successfully applied to the analysis of acetaminophen in tablets and biological fluids

Agegraphic Dark Energy Model in Non-Flat Universe: Statefinder Diagnostic and w−w′w-w^{\prime} Analysis

We study the interacting agegraphic dark energy (ADE) model in non-flat universe by means of statefinder diagnostic and $w-w^{\prime}$ analysis. First, the evolution of EoS parameter ($w_d$) and deceleration parameter ($q$) in terms of scale factor for interacting ADE model in non-flat universe are calculated. Dependence of $w_d$ on the ADE model parameters $n$ and $\alpha$ in different spatial curvatures is investigated. We show that the evolution of $q$ is dependent on the type of spatial curvature, beside of dependence on parameters $n$ and $\alpha$. The accelerated expansion takes place sooner in open universe and later in closed universe compare with flat universe. Then, we plot the evolutionary trajectories of the interacting ADE model for different values of the parameters $n$ and $\alpha$ as well as for different contributions of spatial curvature, in the statefinder parameters plane. In addition to statefinder, we also investigate the ADE model in non-flat universe with $w-w^{\prime}$ analysis.Comment: 20 pages, 4 figures, 2 tables, International Journal of Modern Physics D accepte

Studying the chronic effects of silver nanoparticles on survival, growth rate and reproductive traits of Urmia Lake Artemia (Artemia urmiana)

The application and environmental hazards of nanotechnology to aquatic species are increasingly growing. To address the issue, the present study was designed and carried out to elucidate the toxic effects of silver nanoparticles on growth, survival and reproductive traits of Artemia urmiana. The experiment consisted of five treatments, namely control group and those exposed to 0.001, 0.01, 0.1 and 1 mgl-1 silver nanoparticles, with four respective replicates. To do so, 500 newly hatched nauplii were counted and transferred to 1 liter containers exposing to various concentrations of the silver nanoparticles. Microalgae Dunaliella tertiolecta and zymogenic was used to feed Artemia. Growth and survival rates were recorded on days 8, 11, 17, 20 and 23. After sexual maturation, Artemia were transferred to a new environment free from nanoparticles and their reproductive traits were studied. Results showed that higher concentrations of silver nanoparticles led to lower survival rate and augmented growth rate of Artemia (p<0.05). Regarding reproductive traits, group exposed to 1mgl-1 silver nanoparticles showed the lowest total offspring, offspring per day, offspring per brood and life span (p<0.05). In conclusion, the discharge of silver nanoparticles even at lower concentrations would undesirably influence reproductive cycle of A. urmiana and result in lower survival and reproductive performance of the animal

High breakdown estimators to robustify phase II multivariate control charts.

Control chart is a statistical process control tool that is used to monitor the changes in a process. Hotelling's T2 chart is one of the most popular control charts for monitoring independently and identically distributed random vectors. This chart detects many types of out-of-control signals, but it is not sensitive to small shifts in the mean vector. This study propose a more efficient T2 control charts based on the re-weigted robust estimators of location and dispersion. The proposed control charts are attained by substituting the classical estimators of the mean vector and covariance matrix in the Hotelling's T2 by the re-weighted MCD and re-weighted MVE estimators. In this study, Monte Carlo simulations were carried out to establish the proposed robust control limit. Following that, we suggested suitable estimators for each condition. Our advice in this study is replacing the classical mean vector and covariance matrix of the data in the Hotelling's T2 statistic by there weighted MCD and Re-weighted MVE estimators