Results 31 to 40 of about 5,202,506 (244)

Imaging the Human Thyroid Using Three-Dimensional Diffuse Optical Tomography: A Preliminary Study

Applied Sciences, 2021
Thyroid cancer is usually diagnosed by ultrasound imaging and fine-needle aspiration biopsy. However, diagnosis of follicular thyroid carcinomas (FTC) is difficult because FTC lacks nuclear atypia and a consensus on histological interpretation.
Tetsuya Mimura, Shinpei Okawa, Hiroshi Kawaguchi, Yukari Tanikawa, Yoko Hoshi   +4 more
doaj   +1 more source

Investigation of nonlinear absorption processes with femtosecond light pulses in lithium niobate crystals [PDF]

, 2005
The propagation of high-power femtosecond light pulses in lithium niobate crystals (LiNbO3) is investigated experimentally and theoretically in collinear pump-probe transmission experiments.
Beyer, O., Buse, K., Hsieh, H. T., Maxein, D., Psaltis, D., Sturman, B.   +5 more
core   +1 more source

Derivation of canopy light absorption coefficient from reflectance spectra

Remote Sensing of Environment, 2019
The light absorption coefficient of vegetation is related to the content and composition of pigments in the plant canopy. It is a useful metric for understanding the spatial and temporal dynamics of the absorbed solar radiation, photosynthetic capacity ...
A. Gitelson, A. Viña, A. Solovchenko, T. Arkebauer, Y. Inoue   +4 more
semanticscholar   +1 more source

Nonadiabatic approach to dimerization gap and optical absorption coefficient of the Su-Schrieffer-Heeger model

, 2002
An analytical nonadiabatic approach has been developed to study the dimerization gap and the optical absorption coefficient of the Su-Schrieffer-Heeger model where the electrons interact with dispersive quantum phonons.
A. Takahashi, A.J. Heeger, B. Friedman, B.R. Weinberger, C.N. Yang, C.N. Yang, C.R. Fincher, C.S. Yannoni, D. Baranowski, D. Moses, D. Schmeltzer, E. Fradkin, E. Jeckelmann, G. Minton, H. Takayama, H. Zheng, H. Zheng, H. Zheng, J. Ashkanazi, J. Jiang, J. Ma, J. Solyom, J. Voit, J. Yu, J.E. Hirsch, J.M. Ginder, J.T. Gammel, K. Harigaya, K. Kim, K. Maki, K. Nasu, L.G. Caron, M. Nakahara, M.J. Rice, N. Suzuki, P. Brüesch, P.M. Grant, Q. Wang, R.H. McKenzie, R.P. McCall, S. Etemad, S. Ichinose, S. Kivelson, T. Holstein, W.K. Wu, W.P. Su, W.P. Su, W.P. Su, X.G. Wan, Y. Zou, Y. Zou, Z.B. Su   +51 more
core   +1 more source

Doping Effects and Relationship between Energy Band Gaps, Impact of Ionization Coefficient and Light Absorption Coefficient in Semiconductors

European Journal of Engineering and Technology Research
The doping process is very important in semiconductor technology that is widely used in the production of electronic devices. The effects of doping on the resistivity, mobility and energy band gap of semiconductors are significant and can greatly ...
Md. Bappi Pramanik, Md. Abdullah Al Rakib, M. A. Siddik, Shorab Bhuiyan   +3 more
semanticscholar   +1 more source

The convolution theorem for nonlinear optics

, 2007
We have expressed the nonlinear optical absorption of a semiconductor in terms of its linear spectrum. We determined that the two-photon absorption coefficient in a strong DC-electric field of a direct gap semiconductor can be expressed as the product of
Franz W., Hernando Garcia, Keldysh L., Ramki Kalyanaraman   +3 more
core   +1 more source

Method for Measuring Absolute Optical Properties of Turbid Samples in a Standard Cuvette

Applied Sciences, 2022
Many applications seek to measure a sample’s absorption coefficient spectrum to retrieve the chemical makeup. Many real-world samples are optically turbid, causing scattering confounds which many commercial spectrometers cannot address.
Giles Blaney, Angelo Sassaroli, Sergio Fantini   +2 more
doaj   +1 more source

Time-dependent angularly averaged inverse transport

, 2009
This paper concerns the reconstruction of the absorption and scattering parameters in a time-dependent linear transport equation from knowledge of angularly averaged measurements performed at the boundary of a domain of interest.
Alexandre Jollivet, Bal G, Bal G, Bal G, Bal G Jollivet A, Bal G Jollivet A, Choulli M, Dautray R, Guillaume Bal, Langmore I, Romanov V G, Romanov V G, Rullgård H, Stefanov P, Stefanov P, Wang J-N   +15 more
core   +1 more source

Temperature-Dependent Optical Properties of Oxidized Graphenes

Nanomaterials, 2023
In this study, we investigate how changing important synthesis-related parameters can affect and control the optical characteristics of graphene oxide (GO) and reduced graphene oxide (rGO).
Talia Tene, Paola G. Vinueza-Naranjo, Yesenia Cevallos, Fabian Arias Arias, Matteo La Pietra, Andrea Scarcello, Yolenny Cruz Salazar, Melvin Arias Polanco, Salvatore Straface, Cristian Vacacela Gomez, Lorenzo S. Caputi, Stefano Bellucci   +11 more
doaj   +1 more source

Internal photoemission from quantum well heterojunction superlattices by phononless free-carrier absorption [PDF]

, 1983
The possibility of phononless free-carrier absorption in quantum well heterojunction superlattices was investigated. Order of magnitude calculation showed that the absorption coefficient was significantly enhanced over the phonon-assisted process ...
Chiu, L. C., Margalit, S., Smith, J. S., Yariv, A.   +3 more
core   +1 more source