B4C–Al2O3 composite powder was produced by aluminothermic reduction in Al/B2O3/C system. In this research, microwave heating technique was used to synthesize desired composite. The ball milling of powder mixtures was performed in order to study the effect of mechanical activation on the synthesis process. The synthesis mechanism in this system was investigated by examining the correspondi...

BACKGROUND There has been a substantial increase in the amount of systematic reviews and meta-analyses published on the anterior cruciate ligament (ACL). PURPOSE To quantify the number of systematic reviews and meta-analyses published on the ACL in the past decade and to provide an overall summary of this literature. STUDY DESIGN Systematic review; Level of evidence, 4. METHODS A systemat...

BACKGROUND Univariate meta-analysis (UM) procedure, as a technique that provides a single overall result, has become increasingly popular. Neglecting the existence of other concomitant covariates in the models leads to loss of treatment efficiency. Our aim was proposing four new approximation approaches for the covariance matrix of the coefficients, which is not readily available for the multiv...

OBJECTIVE To determine whether interventional radiology (IR) or laparotomy (LAP) is the best management of delayed postoperative hemorrhage (DPH) after pancreaticoduodenectomy. Data Source We undertook an electronic search of MEDLINE and selected for analysis only original articles published between January 1, 1990, and December 31, 2007. STUDY SELECTION Two of us independently selected studi...

the atmospheric pressure chemical vapor synthesis (apcvs) route is a process that can be used for the synthesis of doped-nanocrystalline powders with very small crystallite sizes having a narrow particle size distribution and high purity. in this study, apcvs technique was used to prepare boron-doped titania nanopowders. the effects of temperature, borate flow rate and water flow rate on the am...

Meta-analysis is a set of statistical procedures used for providing transparent, objective, and replicable summaries of research findings. This tutorial demonstrates the most common procedures on conducting a meta-analysis using the R statistical software program. It begins with an introduction to meta-analysis along with detailing the preliminary steps involved in completing a research synthes...

Abstract Background Cesarean section (CS) rates have been increasing globally. Iran has one of the highest CS in world (47.9%). This review was conducted to assess prevalence and reasons for women’s, family members’, health professionals’ preferences Iran. Methods findings In this mixed-methods systematic review, we searched MEDLINE/PubMed, Embase, CINAHL, POPLINE, PsycINFO, Global Health Libra...

Publication bias, sometimes known as the "file-drawer problem" or "funnel-plot asymmetry," is common in empirical research. The authors review the implications of publication bias for quantitative research synthesis (meta-analysis) and describe existing techniques for detecting and correcting it. A new approach is proposed that is suitable for application to meta-analytic data sets that are too...

This paper describes the synthesis, structure, conformation and configurational stability of novel 8-atom meta-meta’ linked biaryls, as models for controlling ratio atropisomers through remote central chirality. The synthesis model compounds is described where configuration linker provided by reduced C4 C6 sugars. Their properties have been examined X-ray, NMR ECD. Taken together, they provide ...

The asylum regime encloses tens of millions applicants for international protection in camps and different types reception centres, to wait even decades their cases be resolved. Simultaneously both within outside the nation state, seekers refugees occupy a social space natural order things, stage limbo. By incorporating classical anthropological concepts limbo liminality methodological possibil...