Sharif Digital Repository

Polypropylene (PP) has a great market among the commodity thermoplastics. However, its application as an engineering plastic is limited due to the poor toughness and impact strength, especially at low temperatures and high deformation rates. To overcome this shortcoming, elastomeric modifiers have been used in engineering applications and thus rubber-modified PP blends have become a field of growing interest. In this regard, there have been great advances in blending technologies and also catalysts used for polymerization of olefins. Among these advances, the most applicable ones are impact polypropylene copolymers and also the advent of new types of olefinic copolymers that can replace EPR... 

Evaluation of the effects of vehicle characteristics on accident severity is the main objective of this research. In addition to some static and dynamic features of passenger cars, some characteristics of driver and roadway are studied, too. In this research, driver injury severity is modeled as accident severity index. First, the severity of head-on, rear-end, angle and sideswipe accidents are modeled using Binary Logit models. Then, Multinomial Logit models are applied to develop driver injury severity models for head-on and rollover accidents. Finally, Nested Logit model is developed to model severity of head-on accidents to study the performance of different types of Logit models.... 

Correct diagnosis of myocardial scar has always been a major challenge due to the low resolution of cardiac magnetic resonance imaging. The use of a gadolinium-based contrast agent that reveals a scar is the solution proposed in medical science. However, there are limitations to the use of contrast agents in some patients. In recent years, studies based on deep learning techniques have been presented, trying to identify myocardial infarction with the help of images without using contrast agent. This type of diagnosis can be done with the help of different movements of healthy and damaged tissue. Due to the lack of datasets suitable for this application, in this study, real dataset were... 

In Private Equity funds, the manager (known as general partner) collects funds from the investors (known as limited partners) and invests them over a certain time horizon. Assuming that both parties seek to maximize their interests, a situation arises in which the manager does not consider the best interests of the investors. The manager's compensation package is one of the important parts of corporate governance, which consists of four components: management fee, performance based fees (or carried interest), hurdle rate and proceeds distribution method. In this research, first by conducting a semi-structured interview with 15 experts in the PE ecosystem and publishing a questionnaire, the... 

The abstract is the most important section of the thesis because many readers limit most of their reading to abstracts, saving in-depth reading for specific theses. It should give the reader a "preview" of what's to come. The abstract should emphasize new and important aspects of the study or observations. The purpose of the abstract is to allow researchers to decide whether or not to read the whole thesis. The abstract is what researchers read first to decide if the thesis is important, interesting, and it allows them to assess the relevance of a thesis to their own research, without having to read the entire thesis. Thus, it is crucial that the abstract both summarize succinctly the key...