Showing 4 results for Tabatabaeian
Volume 5, Issue 2 (8-2015)
Abstract
Knowledge-based firms are driver of knowledge-based economy that play a key role in development of it. These firms cause synergy in science and wealth, development of knowledge-based economy, achieving scientific and economic goals and commercialization of research and development in the field of high technologies .In literature, terms such as knowledge society, intelligence, learning or knowledge-based organizations are used more often. Related to these concepts, organizations should act intelligently by learning. But theoretical knowledge and review of the literature show that concept of knowledge-based firms are related with the concept of SMEs, start-ups, high-tech industries, new technology based firms and Spin-Offs firms. In this paper we try to identify the main approaches in definitions and provide proper classification of them according to the definitions provided in the literature and using content analysis method. Based on content analysis of the definitions proposed by various researchers and the features offered in several studies, Following Criteria are main characteristics of knowledge based firms: be technologically new, emergence of new industries in the form of definition of sector and medium or high technology, young firms, size of firms, independence of firms, subject of firms –that implies exploitation from new know-how or new technology and a focus on R&D, and founder characteristic.
Volume 9, Issue 3 (Summer 2018)
Abstract
Aims: The innovation ecosystem states that innovation through interactive networks occurs at different levels. The network has a wide range of stakeholders that are complex in the innovation process as part of the innovation ecosystem. Considering the importance of the issue of prevention in the health sector and the importance of the role of biotechnology in this field, the aim of this study was to examine the innovation ecosystem of human vaccines in Iran.
Participants and Methods: In this qualitative, exploratory, and descriptive research, while investigating the dimensions of the ecosystem of innovation in literature and its main characteristics, the status of the innovation ecosystem of human vaccines was investigated in Iran. This study was carried out through content analysis of the current documents and deep and semi-structured interviews with experts in this field. Subsequently, a description of the current state of the vaccine innovation ecosystem was presented.
Findings: Most of the graduates did not have enough familiarity with the techniques needed to attend the industry. The existence of two major vaccine manufacturers, the Pasteur and Razi Institutes, were of important properties of ecosystems. The small number of service providers and existing service companies with knowledge-based organizations were of shortcomings. Shortcomings in the characteristics of stable and dynamic interaction in the innovation ecosystem of human vaccines in Iran were evident and the making policies to create or strengthen these characteristics was one of the important issues of Iran in this area.
Conclusion: Despite the abundance of elements and actors in this field, the innovation ecosystem of vaccines in Iran has not yet been formulated in a structured way, and its creation and development requires the characteristics of the innovation ecosystem and the resolution of its challenges.
M. Baraheni , A. Tabatabaeian , A. Ghasemi, S. Amini,
Volume 20, Issue 7 (July 2020)
Abstract
Thermal fatigue is one of the most important issues in different engineering fields. The importance of this phenomenon is its application in aerospace industries and considerable effects on the material properties. In this research, the effect of thermal fatigue on the machining quality of polymeric CNT-reinforced composites is studied. To follow this aim, initially the composite specimens with eight layers in symmetrical and unsymmetrical layups are fabricated and subjected to thermal cycling. Then, two different machining processes including conventional drilling and ultrasonic vibration assisted drilling are carried out and the thermal fatigue effects are experimentally studied. Additionally, the effects of various parameters including “addition of multi wall carbon nanotube”, “machining process” and “layup method” on machining quality of composites under thermal fatigue condition is investigated in order to obtain the least delamination. The results indicated that addition of multi-walled carbon nanotubes enhances the machining quality up to 13%. It was also revealed that the implement of ultrasonic assisted drilling could reduce the delamination damage up to 10%.
Gh. Maleki, S. Tabatabaeian , M.r. Soltani, A. Davari,
Volume 20, Issue 8 (August 2020)
Abstract
In the present study, the instantaneous velocity profile behind an airfoil at two different Reynolds numbers has been measured experimentally. Data are used to study the wake profile and the corresponding drag coefficient force of the airfoil in different conditions. In the conventional and common methods for calculation of the drag force coefficient through the velocity measurement behind an airfoil, turbulence velocity terms of the momentum equation are ignored. However at moderate to high angles of attack where the flow becomes turbulent and separation occurs, the nature of the flow becomes three dimensional and disregarding the components of the fluctuation of velocity (in three dimensions) in calculation of the drag coefficient of airfoil may result in erroneous information. In the present study, in order to increase the accuracy of the experimental drag coefficient of the airfoil for moderate to high angles of attack, turbulence velocity terms in experimental drag coefficient calculation are considered and this causes an acceptable compatibility between experimental and numerical results whereas for low angles of attack, disregarding the effects of turbulence velocity terms in experimental drag coefficient calculation will improve the accuracy of the experimental drag coefficient and a desired compatibility between experimental and numerical data will be established.
