منابع مشابه
control of the optical properties of nanoparticles by laser fields
در این پایان نامه، درهمتنیدگی بین یک سیستم نقطه کوانتومی دوگانه(مولکول نقطه کوانتومی) و میدان مورد مطالعه قرار گرفته است. از آنتروپی ون نیومن به عنوان ابزاری برای بررسی درهمتنیدگی بین اتم و میدان استفاده شده و تاثیر پارامترهای مختلف، نظیر تونل زنی(که توسط تغییر ولتاژ ایجاد می شود)، شدت میدان و نسبت دو گسیل خودبخودی بر رفتار درجه درهمتنیدگی سیستم بررسی شده اشت.با تغییر هر یک از این پارامترها، در...
15 صفحه اولA Comparison of Numerical Strategies for Modeling the Transport Phenomena in High-Energy Laser Surface Alloying Process
A comparative assessment is done on the effectiveness of some developed and reported macroscopic and mesoscopic models deployed for addressing the three-dimensional thermo-fluidic transport during high-power laser surface alloying process. The macroscopic models include the most celebrated k–ε turbulence model and the large eddy simulation (LES) model, whereas a kinetic theory-based lattice Bol...
متن کاملUnraveling the Effects of Process Control Agents on Mechanical Alloying of Nanostructured Cu-Fe Alloy
Nanostructured Cu-20Fe alloy was synthesized by mechanical alloying process and the effects of process control agents (PCA) on the phase formation, crystallite refinement and morphology of powder particles were studied. The dissolution of Fe into Cu matrix and the morphology of powder particles were analyzed by X-ray diffraction (XRD) technique and scanning electron microscopy (SEM), respective...
متن کاملEffect of Constitutional Supercooling on the Numerical Solution of Species Concentration Distribution in Laser Surface Alloying
2157-67. 3. M. Maeda and Y. Kariya: Iron Steel Inst. Jpn. Int., 1993, vol. 33, pp. 182-87. 4. N. Nakashima, K. Hayashi, Y. Ohta, and K. Morinaga: Mater. Trans. JIM, 1991, vol. 32, pp. 37-42. 5. S. Ueda and M. Maeda: Metall. Mater. Trans. B, 1999, vol. 30B, pp. 921-25. 6. S. Ueda, K. Takemoto, T. Ikeda, and M. Maeda: Iron Steel Inst. Jpn. Int., 2000, vol. 40, pp. s92-s95. 7. A. Tagaya, F. Tsukih...
متن کاملSurface alloying of Mg alloys after surface nanocrystallization.
Surface nanocrystallization using a surface mechanical attrition treatment effectively activates the surface of magnesium alloys due to the increase in grain boundary diffusion channels. As a result, the temperature of subsequent surface alloying treatment of pure Mg and AZ91 alloy can be reduced from 430 degrees C to 380 degrees C. Thus, it is possible to combine the surface alloying process w...
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ژورنال
عنوان ژورنال: Surface Engineering
سال: 1998
ISSN: 0267-0844,1743-2944
DOI: 10.1179/sur.1998.14.4.295