List of Articles circular

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  1 - Presenting a circular economy business model for knowledge-based companies
  Fatemeh Shahdkar taghi torabi Fereydoon  Rahnama Roodposhti
  10.61186/jstpi.37987.19.75.33
  Circular economy is a valuable approach to achieving the concept of sustainability that promotes social equity, economic growth and development, and environmental protection. The main purpose of this study was to present a circular economy business model for knowledge-b More

  Circular economy is a valuable approach to achieving the concept of sustainability that promotes social equity, economic growth and development, and environmental protection. The main purpose of this study was to present a circular economy business model for knowledge-based companies. In terms of purpose, this research is in the category of fundamental-developmental research, and in terms of subject and nature, the approach of qualitative research is exploratory, and grounded theory (systematic) was used. Data were collected through documentary sources (books, articles, dissertations) and semi-structured interviews with 15 academic and non-academic experts through purposeful theoretical sampling to saturate the required information and theoretical adequacy. The data were analyzed based on grounded theory in the framework of open-source, axial, and selective codes. The results of qualitative data analysis of the research, led to the presentation of the business model of circular economy with 124 categories, 17 central categories, and 6 main factors, in the form of 6 dimensions including causal conditions (2 categories), the main phenomenon (circular business model), Strategy (4 categories), contextual characteristics (5 categories), intervening conditions (2 categories) and consequence (4 categories). The model obtained from this research can be a way for stakeholders, planners, and managers of knowledge-based companies to produce and distribute goods and services in the present century. Manuscript profile
• Open Access Article
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  2 - External Skeletal Fixators in Small Animal
  hamid reza moslemi navid Ehsani pour Faeze  Emarloo
  An external skeletal fixator is an orthopedic method for treating open or closed fractures of long tubular bones, joint stiffness, bone lengthening, and congenital malformations. An external skeletal fixator is a device that is installed outside the organ and inserts p More

  An external skeletal fixator is an orthopedic method for treating open or closed fractures of long tubular bones, joint stiffness, bone lengthening, and congenital malformations. An external skeletal fixator is a device that is installed outside the organ and inserts pins into the fracture to fix it and adjust the position of the pin. They are connected to the frame and secured with bolts and nuts. Fixtures have changed significantly in appearance and biomechanics over time, but the principle and function remain the same. These fixtures consist of pins or thin stainless steel wires that penetrate the skin and reach the bone. This way the broken part is fixed in the right direction. Depending on the body geometry and shape, these external skeletal fixators are available in different types such as linear, circular, and hybrid fixators. The simplest and most common type of external skeletal fixator is the linear fixator. The use of an external fixator has several advantages over other fixation methods such as stabilization of the fracture at some distance from the injury site, no need for a cast, ease of patient movement, and minimal involvement of the joint. Premature loosening of the pin is the most common complication causing pain, inflammation, and discharge from the pin tract. Although these fixators are versatile and effective treatment models, they require careful maintenance during treatment. Before deciding to use an external fixator, the patient's and pet's owner's ability to comply with postoperative care instructions should be considered. This article reviews the types of external fixators, postoperative care, and their complications. Manuscript profile