The properties of railway ballast material are affected by the local geologies and climatic environments from which parent rock is sourced. These factors can make it challenging to select most appropriate for applications. To address this issue, paper first reviews means selection in complex across world. criteria materials compared test methods quality quantification summarised. Next, types im...

background: hepatitis c virus (hcv) is a main public health problem causing chronic liver infection and subsequently liver cirrhosis and lethal hepatocellular carcinoma (hcc). vaccination based on hcv capsid proteins has attracted a special interest for prevention of viral infections. the core protein is a basic and evolutionary most conserved protein, which regulates the cellular processes rel...

in the present study, the effect of core on shear lag phenomenon in tubular structures is investigated. three different tubular structure models including model without core, model with central core and model with central core but eliminated in last 15 stories have been analyzed. a shear lag index is defined for evaluating these models. from examination of the results, the effective influence o...

In this study, the engineering properties of asphaltic concrete from selected asphalt plants in Southwestern Nigeria for road construction were sampled three months, analysed and compared with regulatory body specifications. The penetration test, Ductility Marshall Stability flow tests results indicated good conformity to specificationby all JBN exhibiting highest range value while LSPWC has le...

the objective of the present study was to identify managerial competencies. this study reviewed existing managerial competencies in a cultural context resulting in the development of a broad based psychometrically sound leadership questionnaire. the unit of analysis of the research was a theoretical and experimental research related to managerial competencies, provided from seventeen iranian an...

Enhanced resonance search (ERS) is a nondestructive testing method that has been created to evaluate the quality of a pavement by means of a special instrument called the pavement integrity scanner (PiScanner). This technique can be used to assess the thickness of the road pavement structure and the profile of shear wave velocity by using the principle of surface wave and body wave propagation....

Asphalt concrete is a heterogeneous material composed of aggregates, binder cement, and air voids, and may be described as a cemented particulate system. The load carrying behavior of such a material is strongly related to the local load transfer between aggregate particles, and this is taken as the microstructural response. Simulation of this material behavior was accomplished using a finite e...

This series of international conferences has facilitated the development of mechanistic methods for the design and structural evaluation of asphalt pavements over the past 35 years. While the record is one of real achievement, stimulated by initiatives such as the U.S. Strategic Highway Research Program, there are still problems to solve and challenges to face including that of implementing the...

This study presents an application of artificial neural networks (ANN) for the prediction of repeated creep test results for polypropylene (PP) modified asphalt mixtures. Polypropylene fibers are used to modify the bituminous binder in order to improve the physical and mechanical properties of the resulting asphaltic mixture. Marshall specimens, fabricated with M-03 type polypropylene fibers at...

abstract objectives: the purpose of this study was to investigate the relationship between core stability and lower extremity injuries in female athletes through functional tests. decreased core stability has been suggested to contribute to the etiology of lower extremity injuries. so far researches had been used non-functional tests to assess the core stability. material and methods: fifty col...