نتایج جستجو برای: artificial aging
تعداد نتایج: 389761 فیلتر نتایج به سال:
مقدمه: تغییر رنگ کامپوزیتهای دندانی یکی از رایجترین علل تعویض آنها محسوب میشود. هدف از این مطالعه مقایسه ثبات رنگ سه کامپوزیت با پایه متاکریلات Filtek Z250، Filtek Z250xt، Filtek Z350xt و کامپوزیت با پایه سیلوران Filtek P90 پس از Accelerated Artificial Aging (AAA)بود. مواد و روشها: در این مطالعه آزمایشگاهی 56 دیسک کامپوزیتی تهیه شد (14n=). سپس با دستگاه اسپکتروفتومتر انعکاسی پارامترهای CIE...
Sweet corn seeds are sensitive to storage due their low starch content and poor seed vigor. Therefore, it is important understand physiological biochemical behavior during prolong longevity prevent the loss of The purpose this study was elucidate changes in sweet storage. Artificial accelerated aging natural were applied 19 inbred lines. We found that GP, GR VI decreased as proceeded. character...
The present study was undertaken to investigate the effect of aging parameters (time and temperature) on the mechanical properties of Be-and/or Zrtreated Al-Mg-Zn (7075) alloys. Ultimate tensile strength, 0.5% offset yield strength and % elongation measurements were carried out on specimens prepared from cast and heat treated 7075 alloys containing Be and/or Zr. Different aging treatment were c...
In the present study, influence of initial heat-treatment conditions on artificial aging behavior after conventional linear extrusion at room temperature was investigated for precipitation hardening a 6056 aluminum alloy. A solution-annealed condition systematically compared to naturally-aged and pre-aged conditions. Differential scanning calorimetry used analyzing sequence its dependence heat ...
The present study was undertaken to investigate the effect of aging parameters (time and temperature) on the mechanical properties of Be-and/or Zrtreated Al-Mg-Zn (7075) alloys. Ultimate tensile strength, 0.5% offset yield strength and % elongation measurements were carried out on specimens prepared from cast and heat treated 7075 alloys containing Be and/or Zr. Different aging treatment were c...
A variety of mechanisms have been proposed to account for the extension of life span in seeds (seed longevity). In this work, we used Arabidopsis (Arabidopsis thaliana) seeds as a model and carried out differential proteomics to investigate this trait, which is of both ecological and agricultural importance. In our system based on a controlled deterioration treatment (CDT), we compared seed sam...
بررسی آزمایشگاهی ثبات رنگ سه نوع کامپوزیت پس از acclerated artificial aging دکتر هاله حشمت1- دکتر مریم حوریزاد گنجکار1- دکتر منصوره امامی ارجمند2 – دکتر محمدجواد خرازی فرد3 1- استادیار گروه آموزشی دندانپزشکی ترمیمی دانشکده دندانپزشکی دانشگاه آزاد اسلامی واحد تهران، ایران 2- متخصص دندانپزشکی ترمیمی 3- عضو مرکز تحقیقات دندانپزشکی دانشگاه علوم پزشکی تهران، ایران چکیده زمینه و ه...
مقدمه: تغییر رنگ کامپوزیتهای دندانی یکی از رایجترین علل تعویض آنها محسوب میشود. هدف از این مطالعه مقایسه ثبات رنگ سه کامپوزیت با پایه متاکریلات filtek z250، filtek z250xt، filtek z350xt و کامپوزیت با پایه سیلوران filtek p90 پس از accelerated artificial aging (aaa)بود. مواد و روشها: در این مطالعه آزمایشگاهی 56 دیسک کامپوزیتی تهیه شد (14n=). سپس با دستگاه اسپکتروفتومتر انعکاسی پارامترهای cie ...
objectives : the aim of this study was to assess the effect of artificial accelerated aging (aaa) on color change of direct and indirect fiber-reinforced composite (frc) restorations. materials and methods: direct (z250) and indirect (gradia) composite resins were reinforced with glass (gf) and polyethylene fibers (pf) based on the manufacturers’ instructions. forty samples were fabricated and ...
Artificial aging degrades the fatigue crack growth (FCG) resistance of heat treatable aluminum alloys, particularly in the near-threshold regime. Consequently, applications of aluminum alloys in tensiondominated structures that require fatigue damage tolerance are limited to the naturally aged T3 temper. Degraded FCG resistance compromises the benefit from higher strength by artificial aging. W...
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