In the initial stage of SAD phasing, the essential point is to break the intrinsic phase ambiguity. The presence of two kinds of phase information enables the discrimination of phase doublets from SAD data prior to density modification. One is from the heavy atoms (anomalous scatterers), while the other is from the direct-methods phase relationships. The former can be expressed by the Sim distr...

Seasonal variation in urinary stone presentation is well described in the literature. However, previous studies have some limitations. To explore overall cumulative exposure-response and the heterogeneity in the relationships between daily meteorological factors and urolithiasis incidence in 6 major Korean cities, we analyzed data on 687,833 urolithiasis patients from 2009 to 2013 for 6 large c...

In 1938 Yates and Cochran addressed the problem of combining groups of experiments[1]. Although they were considering an agricultural context, the problem is closely analogous to that of conducting a meta-analysis of clinical trials, which in turn has close similarities to the business of analysing multi-centre trials[2]. In fact, it has been suggested that meta-analysis ought to be employed on...

The main purpose of this study was to analyze the effective solutions in the field of waste management in municipalities. The statistical population in this survey –based study consisted of the citizens that lived in Orumiyeh city in West Azerbaijan Province. By using Cochran formula, sample size was estimated to include 180 people. The data collection tool was a questionnaire. The reliability ...

Objective. Study objectives were to assess temporal trends and identify patient- and practice-level predictors of the prescription of antiplatelet medications in a national sample of ischemic stroke (IS) patients seeking ambulatory care. Methods. IS-related outpatient visits by adults were identified using the National Ambulatory Medical Care Survey and National Hospital Ambulatory Medical Care...

OBJECTIVES This paper aims at studying the influence of the organizational climate of a school on the occupational stress of the teachers. MATERIAL AND METHODS The study population were all secondary schools teachers in Tehran in 2007. Using a multi-stage random sampling method, a sample volume of 220 people was determined using the Cochran formula. Two main instruments were used to measure t...

This study aimed to evaluate the differences of prescribing pattern between bisphosphonate and raloxifene users among Korean women with osteoporosis, focusing on the underlying conditions, concurrent medications, nature of healthcare utilization, and regional disparity. We used the Health Insurance Review and Assessment Service National Patients Sample database of the year 2010. Study subjects ...

the purpose of this study was to analyze the barriers to right environmental behaviors by the citizens of zanjan. the experts working in the departments of environment and natural resources in zanjan formed the population of this descriptive – correlation study. the sample size was estimated using cochran's formula (n=60). samples were selected using stratified random sampling method. the ...