Sharif Digital Repository

Limitations of fossil energy resources and environmental factors such as gas emission and global warming, forces human being to tend to apply renewable energies especially solar energy resource. Iran, which is located in yellow belt of the earth, has a high potential to be benefited from solar energy. Since more than 40 percent of energy resources are consumed in the building section, using solar energy I buildings can help the country to reduce the energy consumption. Space Cooling and heating and water heating are some examples of solar energy applications in buildings. Because, there are various types of climates in the world, there is not a unified code and guideline to design and... 

It is widely recognized today that excess moisture in pavement layers, when combined with heavy truck traffic and moisture-susceptible materials, can reduce the service life. Temperatures below freezing can also contribute to durability problems of saturated materials. A major objective in pavement design is to keep the base, subbase, subgrade, and other susceptible paving materials from becoming saturated or even being exposed to constant high moisture levels over time. The use of subsurface drainage has gained popularity over the past two decades, and many pavement agencies now routinely specify drainable pavement structures to reduce moisture-related problems in avements. In this... 

A pavement management system (PMS) is a set of tools that aid the decision makers in finding optimum strategies for maintaining pavements in a serviceable condition over a given period of time. A frame work for pavement management system for Iran was proposed by Tabatabaee et al. with the support of Transportation Research Institute of Ministry of Road and Transportation. In the proposed frame work, two horizons of development, short and long term, have been envisaged for more rapid and efficient utilization of the system within the technical and administrative divisions of the Ministry. This thesis describes the software package developed based on the proposed frame work for the... 

The rapid technological changes have faced organizations with a new challenge: old and obsolete knowledge when it hampers organizational change or creates some kind of possible negative impact. Hence, in many cases, companies need to actively deal with such old and obsolete knowledge and their possible negative impacts in order to survive in highly competitive market. Defining unlearning as the intentional process of managing the old and obsolete knowledge in order to reduce its possible negative impacts, this study focuses on how organizations manage their old and obsolete knowledge and how the pattern of unlearning actions varies based on different types of knowledge.
Analyzing the... 

In this thesis, an algorithm is developed based on Multi Criteria Decision Analysis (Analytical Hierarchy Process, TOPSIS) combination with Fuzzy logic, and then user-friendly software with a GUI was designed and introduced. By using this method, it becomes possible to compare processes based on their ratings and users desired importance, and finally determine the closest process to the user ideal choice  

A proper process selection has an important role in optimal operation of designed plants at exploitation time. The aim of this research is to provide software for the optimal process selection of municipal wastewater treatment plants in Iran which is a multi criteria optimization process. For this reason this project has been defined to establish a unique procedure for process selection aiming to help design engineers to find optimal process combinations. The main reasons of this case study include: special geology, the culture of people and economic conditions. Heretofore, numerous efforts have been done on optimal wastewater treatment process selection. But in most of them selection has... 

Gamma-ray spectroscopy is the quantitative study of the energy spectra of gamma-ray sources. A gamma-ray spectrometer also determines the energies of the gamma-rays photons emitted by the source. A radioactive nucleus (radionuclide) commonly emits gamma rays in the energy range from a few keV to ~10 MeV, corresponding to the typical energy levels in nuclei with reasonably long lifetimes. Most radioactive sources produce gamma rays of various energies and intensities. When these emissions are collected and analyzed with a gamma-ray spectroscopy system, a gamma-ray energy spectrum can be produced. A detailed analysis of this spectrum is typically used to determine the identity and quantity of... 

One of the biggest challenges in software companies is reaching a common understanding between staff members across the organization with different expertise. If not solved, this problem could cause other organizational problems, such as project failures, lack of innovation in new products, organizational conflict, and even interppersonal conflicts between employees and/or managers. Recent research has shown that boundary objects can help decrease knowledge gaps between workers.This research reviews boundary objects’ properties, life cycle, and effects by investigating some boundary objects in a startup software company. This research’s goal is to increase the knowledge about boundary...