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مهندسی معماری - 1908 تئوری مـای (Mie):

1908 تئوری مـای (Mie):

چهارشنبه 28 دی 1390 04:28 ق.ظ

نویسنده : موسی عبدی
فیزیکدان آلمانی گوستاو مای نقش مؤثری در نانو تکنولوژی با طرح تئوری پراکندگی نور توسط ذرات داشت . او نشان داد که امواج کوتاه در پراکندگی نور مؤثر تر از امواج با طول موج بلند است . ما آسمان را آبی می بینیم چرا که مولکولهای هوا ( که بسیار ریز هستند) در فاصله کوتاه نور را بیشتر در طول موج آبی می شکنند تا زرد یا قرمز چرا که نور آبی امواج کوتاه تری دارد .
وقتی خورشید غروب می کند نسبت به وسط روز فاصله بیشتری از ما می گیرد ،در این مورد پراکندگی بیشتر توسط ذرات گرد و غبار صورت می گیرد . این ذرات هنوز اثر بیشتری بر امواج آبی دارد تا زرد و قرمز ، بنابراین نوری که هنوز شکسته نشده به ما می رسد که مخلوطی از رنگهای زرد و قرمز است . پس رنگ آسمان در هنگام غروب قرمز و زرد به نظر می رسد.
تئوری مای به دانشمندان کمک کرد تا به این نتیجه برسند که اندازه ذرات مشخص کننده رنگی است که ما می بینیم . مای اندازه تعداد زیادی از ذرات را بوسیله تشخیص نورهایی که آنها را می شکند بدست آورد . برای اندازه گیری نانو ذرات و ذرات بزرگتر این تئوری مستلزم محاسبات هنگفتی است بنابر این تا حدود 20 سال پیش - که سوپر کامپیوتر ها توانمند شدند - بندرت بکار برده می شد . هم اکنون تئوری مای (بخوبی پیشرفت های اخیر دیگر ) به پژوهشگران کمک می کند تا اندازه نانو ذرات را محاسبه کنند.



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برچسب ها: 1908 تئوری مـای (Mie) ، تئوری مای ،
آخرین ویرایش: شنبه 1 بهمن 1390 01:11 ب.ظ



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