for all $a,b>0$, the following two optimal inequalities are presented: $h^{alpha}(a,b)l^{1-alpha}(a,b)geq m_{frac{1-4alpha}{3}}(a,b)$ for $alphain[frac{1}{4},1)$, and $ h^{alpha}(a,b)l^{1-alpha}(a,b)leq m_{frac{1-4alpha}{3}}(a,b)$ for $alphain(0,frac{3sqrt{5}-5}{40}]$. here, $h(a,b)$, $l(a,b)$, and $m_p(a,b)$ denote the harmonic, logarithmic, and power means of order $p$ of two positive numbers...

A single point of failure (SPOF) in system operations is a weak point of system reliability. Mean time to failure (MTTF) of system operations is equal to the shortage component’s MTTF in system. A Tier IV data center is designed to eliminate the SPOF. Data center system reliability is not only depended on the MTTF of each component in the system, but also relies on the mean time to repair (MTTR...

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RESEARCHDESIGNANDMETHODSdA retrospective cohort study was performed of 1,229 nondiabetic men, aged 25–60 years, who were recruited from the Health Promotion Center, Samsung Medical Center, between January 1997 and December 1997. They were followed regularly at the center on an out-patient basis and during hospitalization for a mean of 8.4 years, and the development of type 2 diabetes was determ...

one-hundred and sixteen children with esrd were registered in shiraz pediatric hemodialysis center in nemazee hospital, a referral center in the south of iran, from 1990 to 1999. very small children are not dialysed in this center due to technical problems. the age range of children in this center was 2-16 years, mean age was 10.4±3.6 years and male to female ratio was 1.4. major causes of esrd...

BACKGROUND AND OBJECTIVE Measurements performed on fundus images using current software are not accurate. Accurate measurements can be obtained only by calibrating a fundus camera using measurements between fixed retinal landmarks, such as the dimensions of the optic nerve, or by relying on a calibrated model eye provided by a reading center. However, calibrated spectral domain OCT (SD-OCT) cou...

End-stage renal disease (ESRD) patients treated with hemodialysis have a high mortality rate, which is largely due to inadequate dialysis. Dialysis adequacy, measured by the urea reduction ratio (URR), tends to be correlated within dialysis facilities with wide variations in average center adequacy. These are characteristics of a center effect, which can have an important impact on dialysis ade...

Results: A total of 155 (79.5%) subjects had adequate postoperative lateral radiographs and complete BPII scores. The mean duration of follow-up (±SD) was 24.4 ± 8.2 months (range, 12-74 months). Measurement from the center of the femoral tunnel to the Schöttle point resulted in 143 (92.3%) tunnels being categorized as “good” or “ideal.” There were 8 failures in the cohort, none of which occurr...

this study aims to determine the relationship between innovation climate and the librarians' innovative behavior in organization of libraries, museums and documentation center of astan quds razavi, as the largest public library of iran. the methodology for this study is based on a survey research. to this purpose, the innovative behavior questionnaire and ekvall's (1996) innovation climate, dev...