نتایج جستجو برای: mechanical methods
تعداد نتایج: 2077186 فیلتر نتایج به سال:
Epoxy – Polysulfide copolymers without or with low amounts of epoxy in their structure have poor mechanical properties in oxidative curing system.To strengthen the mechanical properties of polysulfide elastomer inclusion of epoxy resin (Epon828) as hard segment was studied. FT-IR spectroscopy and rheometry were used to verify the formation of epoxy-polysulfide copolymer. Results obtained f...
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...
The effect of mechanical surface conditioning methods on the shear bond strength of repaired composites Dr. P. Alizadeh Oskuee* - Dr. N. Mohammadi* - Dr. S. Savadi Oskuee* - Dr. A. Hoseini** *- Assistant Professor of Operative Dentistry Dept. - Faculty of Dentistry – Tabriz University of Medical Sciences. **- Dentist. Background and Aim: Considering the cost and quantity of tooth loss in the pr...
Achieving the mechanical properties of steels after various manufacturing and heat treatment processes is significant and essential. In production lines, after producing the specific and standard samples, mechanical properties have been measured by destructive processes which cause waste of cost and time. In addition, destructive techniques cannot detect the miniscule changes made in mechanical...
Clinical comparison of mechanical and chemomechanical methods in removing deep dentinal caries Dr. F. Darabi* - Dr. N. Kia Rostami** *- Assistant Professor of Operative Dentistry Dept. - Faculty of Dentistry - Guilan University of Medical Sciences. ** - Dentist. Background and Aim: The use of CarisolvTM decreases unnecessary removal of sound dental tissue and reduces the possibility of pulpal e...
Some near-regular mechanical systems involve global deviations from their corresponding regular system. Despite extensive research on vibration analysis (eigensolution) of regular and local near-regular mechanical systems, the literature on vibration analysis of global near-regular mechanical systems is scant. In this paper, a method for vibration analysis of such systems was developed using Kr...
The defect in work rolls directly influence the forming cost and the final shape of the product. The researchers tend to investigate the thermo-mechanical stress in work roll of rolling machines. These stresses may reduce the roll life. Since the investigation of the thermo-mechanical stress in work roll with real-conditions is complex, comprehensive studies by means of numerical methods are av...
Introduction: Mechanical ventilation has been one of the most common forms of patients’ medical treatment in intensive care unit and several factors affect the preparation of patients for weaning the mechanical ventilation. This study aimed at determining factors that have an impact on the duration of mechanical ventilation weaning. Methods: In this sectional -an...
Objective(s): The aim of this study was to synthesis new dental nanocomposites reinforced with fabricated glass nanoparticles and compare two methods for fabrication and investigate the effect of this filler on mechanical properties. Materials and Methods: The glass nanoparticles were produced by wet milling process. The particle size and shape was achieved using PSA and SEM. Glass nanoparticle...
Introduction: Cholestasis is impairment of normal bile excretion into the duodenum and classified as mechanical and non mechanical cholestasis. Mechanical Cholestasis presents with increase in bile duct diameter or obstruction in bile duct in an ERCP. Cholestasis leads to different complications. One of these complications is mucosal peptic erosion leading to gastrointestinal bleeding, perfora...
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