نتایج جستجو برای: stimulating raman scattering

تعداد نتایج: 193285  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده علوم پایه 1392

راکتورهای همجوشی، ماشین هایی برای استخراج انرژی هسته ای می باشند. در این راکتورها هسته های عناصر سبک در طی یک واکنش همجوشی هسته ای به هست? سنگین تر تبدیل می شوند که این واکنش با تولید انرژی همراه است. محاسبات نشان می دهند که به منظور داشتن راکتوری بهینه، سوخت همجوشی باید دارای دمایی از مرتب? 10میلیون درج? سانتی گراد و چگالی ای از مرتب? 23^10 ذره بر مترمکعب باشد. بنابراین، مسئل? گرم کردن ومحصورس...

Journal: :iranian journal of numerical analysis and optimization 0
a. keshavarz n. zamani

in this work, by using the particle swarm optimization the electron raman scattering for square double quantum wells is optimized. for this purpose, by combining the particle swarm algorithm together with the numerical solution procedures for equations, and also the perturbation theory we find the optimal structure that maximizes the electron raman scattering. application of this algorithm to t...

Ni ferrite crystalline material is synthesized using a sol-gel method at two different temperatures. The vibrational and stretching modes, crystalline phase, size distribution and morphology of the products are investigated via Raman back-scattering and Fourier transform infrared (FTIR) spectroscopy, XRD and FESEM, respectively. Vibrational modes of spinel ferrite are observed at Raman and FTIR...

A. Zakery, H. Pakarzadeh,

In this paper, by including Raman scattering in the coupled-mode equations, the scalar modulation instability in photonic crystal fibers is investigated. The evolution of the pump, Stokes and anti-Stokes waves along the fiber as well as the conversion efficiency for two cases, with and without Raman effect, are studied. The effect of anti-Stokes seed and the pump depletion on the evolution of S...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده علوم پایه 1390

در این پایان نامه در ابتدا با استفاده از روش سل – ژل که روشی کم هزینه است نانو ذرات ktp و zno را تولید می کنیم ، سپس مشخصه یابی ساختاری ، اپتیکی و ریخت شناسی مورد بحث قرار گرفته است. به منظور شناخت فازهای موجود، ساختار و ریخت شناسی نانو ذرات از روش پراش اشعه ایکس (xrd) ، طیف سنجی پس پراکندگی میکرو رامان (raman scattering) و میکروسکپ الکترونی روبشی (sem) استفاده گردیده است به کمک طیف سنجی های پ...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2003
amanollah aminzadeh

ft-sers (fourier transform surface enhanced raman scattering) of adriamycin and its complex with dna is reported. it is shown that in agreement with previous raman studies the interaction of adriamycin  with dna takes place through an intercalation mechanism. the presence of a new band at 731 cm-1 suggests that ring d of adriamycin is not involved in the intercalation process.

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید بهشتی - دانشکده علوم 1386

چکیده ندارد.

Journal: :international journal of nanoscience and nanotechnology 2013
r. malekfar a. cheraghi g. ahmadi h. nanakar a. mansori

in this work the synthesization process of nanocrstallite nd:ktp powders by modified pechini methodwas studied. the results of xrd studies indicate that ktp nanocrystallites doped by nd has orthorhombicphase. the structural and lattice modes of the synthesized nanocrystallite products were investigated byusing micro raman back scattering and ft-ir transmission spectroscopies. sem imaging techni...

2008
Kathrin Spendier RAMAN LASER

Introduction Scattering of optical radiation by materials is a topic that has received much attention over the past 100 years. One particular type, Raman scattering, was first observed by C.V. Raman in 1928, and since then this inelastic scattering process has found many uses in basic and applied science. Raman scattering can be used to make spectroscopic measurements, or exploited to build Ram...

Journal: :Nanoscale 2016
Jianhua Zeng Lei Chen Qiaofeng Dai Sheng Lan Shaolong Tie

We proposed a scheme in which normal Raman scattering is coupled with hyper-Raman scattering for generating a strong anti-Stokes hyper-Raman scattering in nanomaterials by using femtosecond laser pulses. The proposal was experimentally demonstrated by using a single-layer MoS2 on a SiO2/Si substrate, a 17 nm-thick MoS2 on an Au/SiO2 substrate and a 9 nm-thick MoS2 on a SiO2-SnO2/Ag/SiO2 substra...

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