This paper presents a magnetostrictive in-pipe impact drive mechanism (IDM). To estimate the output performances of the IDM, a dynamics model was developed based on the magnetostrictive material constitutive model and mechanical model of the IDM. Therefore, an experimental system has been built to test the motion performance of IDM. Simulation and experimental results illustrate that the propos...

Coursebooks are normally written to contain information, instruction, exposure, and activities that learn- ers at a particular level need to enhance their communicative competence in the target language. Howev- er, many global course books make attempts to include content, topics, and texts that do not disadvantage any learner around the world. That is why global course books normally do ...

plastics are well-established for convenient and safe packaging and distribution of food and feed goods. at present, this special sector of the plastic market displays remarkably increasing quantities of its annual production. caused by the ongoing limitation and strongly fluctuating prices of fossil feedstocks, classically used for plastic production, there is an evident trend to switch toward...

The present study was an attempt, to empirically investigate if there was any significant difference between authentic listening materials and their simplified version in terms of the listening comprehension of Iranian EFL learners. To this end, two groups of thirty subjects were chosen. One group received authentic listening materials and the other group received the same topic in simplified v...

statement of the problem: candida species are believed to play an important role in initiation and progression of denture stomatitis. the type of the denture material also influences the adhesion of candida and development of stomatitis. purpose: the aim of this study was comparing the adherence of candida albicans to the conventional and injection molding acrylic denture base materials. materi...