Universal scheme for measuring the electron in semiconductors and application to a lightly-doped -GaAs sample

2012 ◽  
Vol 152 (5) ◽  
pp. 410-413 ◽  
Author(s):  
J.S. Colton ◽  
K. Clark ◽  
D. Meyer ◽  
T. Park ◽  
D. Smith ◽  
...  
Keyword(s):  
Gaas Sample ◽  
Universal Scheme

A Fractional-Diffusion Theory for Calculating Thermal Properties of Thin Films From Surface Transient Thermoreflectance Measurements

2001 ◽  
Vol 123 (6) ◽  
pp. 1133-1138 ◽  
Author(s):  
Vladimir V. Kulish ◽  
Jose´ L. Lage ◽  
Pavel L. Komarov ◽  
Peter E. Raad
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Analytical Solutions ◽  
Laser Energy ◽  
Diffusion Theory ◽  
Complete Solution ◽  
Diffusion Problem ◽  
Gaas Sample ◽  
Volumetric Heating ◽  
Pulsed Laser Heating

The transient thermoreflectance (TTR) method consists of measuring changes in the reflectivity of a material (thin film) under pulsed laser heating, and relating these changes to the corresponding surface temperature variations. Analytical solutions of the diffusion problem are then used to determine the thermal conductivity of the material following an iterative matching process between the solutions and the experimental results. Analytical solutions are attainable either when the material absorbs the laser energy volumetrically or when the material absorbs the laser energy at the surface. Either solution allows for the determination of only one thermal property (thermal conductivity or diffusivity), with the other one assumed to be known. A new, single, analytical solution to the transient diffusion equation with simultaneous surface and volumetric heating, found using fractional calculus, is presented in a semi-derivative form. This complete solution provides the means to determine the two thermal properties of the material (thermal conductivity and diffusivity) concomitantly. In this preliminary study, the solution component for surface heating is validated by comparison with experimental data for a gold sample using the classical thermoreflectance method. Further results, for surface and volumetric heating, are obtained and analyzed considering a GaAs sample.

The Life of Rhythm

2019 ◽  
pp. 101-109
Author(s):  
Garry L. Hagberg
Keyword(s):  
Fine Arts ◽  
Jazz Improvisation ◽  
Living Body ◽  
The Arts ◽  
Art As Experience ◽  
Universal Scheme ◽  
Live Organism

Chapter 6 poses the question: Why does rhythm speak to us so deeply? Patterns of accented or percussive sound that move us are meaningful, yet we find it hard to say what associations or connotations create that meaning. It argues that John Dewey’s Art as Experience has deep insights on this question, and focuses on their implications for jazz improvisation. For Dewey, both player and listener are like the live organism interacting within its environment. Hagberg addresses Dewey’s understanding that “rhythm is a universal scheme of existence, underlying all realization of order in change, [that] pervades all the arts, literary, musical, plastic and architectural, as well as the dance”; that “The supposition that the interest in rhythm which dominates the fine arts can be explained simply on the basis of rhythmic processes in the living body is but another case of the separation of organism from environment.”

A Universal Scheme for Patterning of Oxides via Thermal Nanoimprint Lithography

2012 ◽  
Vol 23 (17) ◽  
pp. 2201-2211 ◽  
Author(s):  
Saman Safari Dinachali ◽  
Mohammad S. M. Saifullah ◽  
Ramakrishnan Ganesan ◽  
Eng San Thian ◽  
Chaobin He
Keyword(s):  
Nanoimprint Lithography ◽  
Universal Scheme

scholarly journals Measurement of statistical nuclear spin polarization in a nanoscale GaAs sample

2011 ◽  
Vol 84 (20) ◽  
Author(s):  
Fei Xue ◽  
D. P. Weber ◽  
P. Peddibhotla ◽  
M. Poggio
Keyword(s):  
Spin Polarization ◽  
Nuclear Spin ◽  
Gaas Sample ◽  
Nuclear Spin Polarization

In-situ Measurement of GaAs Optical Constants and Surface Quality, as Functions of Temperature

1991 ◽  
Vol 222 ◽  
Author(s):  
Huade Yao ◽  
Paul G. Snyder
Keyword(s):  
Room Temperature ◽  
Optical Constants ◽  
Molecular Beam ◽  
Elevated Temperatures ◽  
Native Oxide ◽  
Time Data ◽  
Gaas Sample ◽  
Optical Thermometer ◽  
Surface Changes

ABSTRACTIn-situ spectroscopic ellipsometry (SE) was applied to monitor GaAs (100) surface changes induced at elevated temperatures inside an ultrahigh vacuum (UHV) chamber (<1×10−9 torr base pressure, without As overpressure). The real time data showed clearly the evolution of the native-oxide desorption at ∼577°C, on a molecular-beam-epitaxy (MBE)-grown GaAs (100) surface. In addition, surface degradation was found before and after the oxide desorption. A clean and smooth surface was obtained from an arsenic-capped, MBE-grown GaAs sample, after the arsenic coating was evaporated at ∼350 °C inside the UHV. Pseudodielectric functions <ε>GaAs, from 1.6 eV to 4.5 eV, were obtained through the SE measurements, from this oxide-free surface, at temperatures ranging from room temperature (RT) to ∼610 °C. These <ε> data were used as reference data to develop an algorithm for determining surface temperatures from in-situ SE measurements, thus turning the SE instrument into a sensitive optical thermometer.

Universal scheme for finite-probability perfect transfer of arbitrary multispin states through spin chains

2014 ◽  
Vol 351 ◽  
pp. 739-750 ◽  
Author(s):  
Zhong-Xiao Man ◽  
Nguyen Ba An ◽  
Yun-Jie Xia ◽  
Jaewan Kim
Keyword(s):  
Spin Chains ◽  
Perfect Transfer ◽  
Universal Scheme

scholarly journals Simultaneous Quantification of Indium and Nitrogen Concentration in InGaNAs Using HAADF-STEM

2014 ◽  
Vol 20 (6) ◽  
pp. 1740-1752 ◽  
Author(s):  
Tim Grieb ◽  
Knut Müller ◽  
Emmanuel Cadel ◽  
Andreas Beyer ◽  
Marco Schowalter ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Strain State ◽  
Nitrogen Concentration ◽  
Energy Shift ◽  
Dark Field ◽  
Sources Of Information ◽  
Gaas Sample ◽  
Transmission Electron Microscopy Analysis ◽  
Transmission Electron

AbstractTo unambiguously evaluate the indium and nitrogen concentrations in InxGa1−xNyAs1−y, two independent sources of information must be obtained experimentally. Based on high-resolution scanning transmission electron microscopy (STEM) images taken with a high-angle annular dark-field (HAADF) detector the strain state of the InGaNAs quantum well is determined as well as its characteristic HAADF-scattering intensity. The strain state is evaluated by applying elasticity theory and the HAADF intensity is used for a comparison with multislice simulations. The combination of both allows for determination of the chemical composition where the results are in accordance with X-ray diffraction measurements, three-dimensional atom probe tomography, and further transmission electron microscopy analysis. The HAADF-STEM evaluation was used to investigate the influence of As-stabilized annealing on the InGaNAs/GaAs sample. Photoluminescence measurements show an annealing-induced blue shift of the emission wavelength. The chemical analysis precludes an elemental diffusion as origin of the energy shift—instead the results are in agreement with a model based on an annealing-induced redistribution of the atomic next-neighbor configuration.

scholarly journals ИСПОВЕДАЛЬНОСТЬ В ПОЭЗИИ ВЯЧЕСЛАВА ИВАНОВА: ПРЕДВАРИТЕЛЬНЫЕ ЗАМЕЧАНИЯ

2020 ◽  
pp. 139-150
Author(s):  
Никита Быстров
Keyword(s):  
The State ◽  
The Subject ◽  
Vyacheslav Ivanov ◽  
Universal Scheme ◽  
Existential Uncertainty

The article traces parallels between some confessional situations in the poetry of Vyacheslav Ivanov and the Confessions of St. Augustine. The question is raised about the ability of Ivanov`s symbolism to reproduce the existential uncertainty (ignorance of the further path, the actual rejection of its foreshadowing by culture and intellectual experience), to which the confession should lead the subject, if s/he follows the principle of Augustine`s „transcende te ipsum”. When the state of confession is pre-established by a system of symbols with a „ready” meaning, it risks losing its uniqueness: the confession can be replaced by some universal „scheme” of confessionality, which happens in a number of the Ivanov`s poems. Thus, the article delineates one of the possible perspectives of the further study of the claimed topic.

Sign in / Sign up

Export Citation Format

Share Document