abstract in aggregate, active forms of reactive silica with mineral names are sometimes associated with sand and gravel in concrete mixture. alkali hydroxides originated from alkalis in the cement or other resources form an alkaline silica gel with this reactive silica which becomes swallowed and expanded during time causing damage to concrete. there have been growing researches on alkaline r...

in reality, most structures involved in geotechnical engineering are three dimensional in nature, and although in many, plane strain or axisymmetric approximations are reasonable, there are some, for which 3-d treatment is required. the quantity of data, and the size of the various vectors and matrices involved in such analysis, increase dramatically. this has sever implications for computer r...

data envelopment analysis (dea) is a powerful tool for measuring relative efficiency of organizational units referred to as decision making units (dmus). in most cases dmus have network structures with internal linking activities. traditional dea models, however, consider dmus as black boxes with no regard to their linking activities and therefore do not provide decision makers with the reasons...

in civil engineering concrete is a material combined of hydraulic cement, sand, gravel and water. gravel and sand compose 60 to 70 percent of concrete. these aggregates support compression force of concrete. cement paste acts as glue to stick grain together. in bushehr factories producing aggregates do not operate according to astm standards, so that fineness modulus (fm) of the produced sands ...

Today, tourism industry, as a dynamic industry, has devoted an important part of production activities in the world by its development-oriented features. Hence its development in a country requires factors such as an appropriate strategy, planning and efficient management. In this paper, the status of tourism industry in Zanjan Province has been evaluated using SWOT technique and Input-Output t...

in this study, scour of mashkid bridge pier located in mashkid river of saravan county has been studied and to measure the scour rate, the numerical model hec-ras 4.0 has been used. upon selection of mashkid river as the case study and whereas the studied zone is important with respect to the climatic conditions and showery monsoon raining and flowing the great and destructive floodwaters, ther...

INTRODUCTION: The present study aimed to identify the factors affecting the effective In-Service training of employees at the Red Crescent Society of Zanjan province. METHODS: This mixed methods research was conducted in two stages. Firstly, the factors affecting the effectiveness of in-service training of employees at the Red Crescent of Zanjan Province were determined through semi-structured...

abstract chickpea is weak in competition of weeds that damages to it at between 40 t0 60 percent. kermanshah province is one of the most important region for chickpea fields in iran. for these reosons, weed management is necessary in this crop. in order to evaluate of herbicides and stubble control on broad leave weeds control in chickpea. experiment was conducted in agricultural research stat...

Entrepreneurial competencies have critical effect on venture enterprises. In this regard, measuring entrepreneurial competencies can be applied in planning for improving these competencies in Agricultural Engineering, Technical, and advisory Companies in south of Kerman province. Thus, the main purpose of this study was to measure entrepreneurial competencies of Agricultural Engineering, Techni...