Optically detected carrier transport and capture in III/V semiconductor QW structures: high-resolution experiments, model calculations, and applications in fast 1.55-um lasers

1998 ◽  
Author(s):  
Hartmut Hillmer ◽  
Saulius Marcinkevicius
Keyword(s):  
High Resolution ◽  
Carrier Transport ◽  
Model Calculations ◽  
Optically Detected

The spectrum of gaseous methane at 77 K in the 1.1 – 2.6 μm region: a benchmark for planetary astronomy

1989 ◽  
Vol 67 (11) ◽  
pp. 1027-1035 ◽  
Author(s):  
A. R. W. McKellar
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Low Temperature ◽  
Spectral Resolution ◽  
Fourier Transform Spectrometer ◽  
Absorption Cell ◽  
Model Calculations ◽  
Testing Model ◽  
Medium Resolution ◽  
Spectrometer Data

The spectrum of CH4 obtained in CH4 plus N2 mixtures at a temperature of 77 K has been recorded with a spectral resolution of 0.14 cm−1 in the region 3800 to 9100 cm−1. The experiments were performed with long paths (66 or 88 m) in a cooled absorption cell using a Fourier-transform spectrometer. Data are presented here at low and medium resolution, and examples of some spectral regions are also shown at high resolution. The complete results are available from the author in an Appendix. Comparisons are made with previous model calculations of CH4 absorption, and with the observed spectrum of Neptune's satellite, Triton. The results should be useful for the interpretation of the spectra of Triton, Titan, and Pluto. They will also be of value for testing model calculations of low-temperature CH4 absorption, which, thus verified, can be used with greater confidence to analyze observations of Jupiter, Saturn Uranus, and Neptune.

scholarly journals Interpretation of Extragalactic Jets

1986 ◽  
Vol 89 ◽  
pp. 425-437
Author(s):  
Michael L. Norman
Keyword(s):  
High Resolution ◽  
Visual Inspection ◽  
Physical Parameters ◽  
Model Calculations ◽  
Radio Jets ◽  
Extragalactic Jets ◽  
Self Consistent ◽  
Interferometric Observation ◽  
The Subject

The subject of this paper is the interpretation of extragalactic radio jets. In this paper I will focus on what we have learned about the nature of extragalactic jets on the basis of model calculations. By model I mean any set of calculations, whether analytic, semi-analytic or numerical, which, when carried through from their respective assumptions to their internally self-consistent conclusions, help place constraints on the physical parameters and processes in the jets and their associated radio lobes. In this field, a visual inspection of a modern high-resolution radio interferometric observation (see review by PERLEY in these proceedings) often leads to statements like “that looks just like such and such in Landau and Lifschitz; I betcha that’s what’s going on!” This I call a speculation, or, at best, a hypothesis. I am addressing here the step beyond hypothesis, namely modeling, which is necessary to confront not only the object in question, but more importantly, the hypothesis itself. In the end, we will remember only the hypotheses.

scholarly journals Evaluation of variability in high resolution protein structures by global distance scoring

2017 ◽  
Author(s):  
Risa Anzai ◽  
Yoshiki Asami ◽  
Waka Inoue ◽  
Hina Ueno ◽  
Koya Yamada ◽  
...  
Keyword(s):  
High Resolution ◽  
Global Analysis ◽  
Protein Structures ◽  
Data Bank ◽  
Relevant Information ◽  
Systematic Analysis ◽  
Structure Variation ◽  
Model Calculations ◽  
Biologically Relevant ◽  
Global Comparison

AbstractSystematic analysis of statistical and dynamical properties of proteins is critical to understanding cellular events. Extraction of biologically relevant information from a set of high-resolution structures is important because it can provide mechanistic details behind the functional properties of protein families, enabling rational comparison between families. Most of the current structure comparisons are pairwise-based, which hampers the global analysis of increasing contents in the Protein Data Bank. Additionally, pairing of protein structures introduces uncertainty with respect to reproducibility because it frequently accompanies other settings for superimposition. This study introduces intramolecular distance scoring, for the analysis of human proteins, for each of which at least several high-resolution are available. We show that the results are comprehensively used to overview advances at the atomic level exploration of each protein and protein family. This method, and the interpretation based on model calculations, provide new criteria for understanding specific and non-specific structure variation in a protein, enabling global comparison of the dynamics among a vast variety of proteins from different species.

Structure of the 89Zr via the high-resolution 91Zr(p,t)89Zr reaction and shell-model calculations

2002 ◽  
Vol 697 (3-4) ◽  
pp. 611-629 ◽  
Author(s):  
P. Guazzoni ◽  
L. Zetta ◽  
J.N. Gu ◽  
A. Vitturi ◽  
Y. Eisermann ◽  
...  
Keyword(s):  
High Resolution ◽  
Shell Model ◽  
Model Calculations

scholarly journals A Proposed Solution to the Range–Doppler Dilemma of Weather Radar Measurements by Using the SMPRF Codes, Practical Results, and a Comparison with Operational Measurements

2005 ◽  
Vol 44 (9) ◽  
pp. 1375-1390 ◽  
Author(s):  
Juha Pirttilä ◽  
Markku S. Lehtinen ◽  
Asko Huuskonen ◽  
Markku Markkanen
Keyword(s):  
High Resolution ◽  
Pulse Repetition Frequency ◽  
Weather Radar ◽  
Simplified Model ◽  
Measured Spectrum ◽  
Model Calculations ◽  
Incoherent Scatter ◽  
Incoherent Scatter Radars ◽  
Working Principle ◽  
Radar Measurements

Abstract Based on the measurement principles used on incoherent scatter radars, the authors have developed the Simultaneous Multiple Pulse Repetition Frequency (SMPRF) code that is intended to solve the range–Doppler dilemma and that can be used with modern magnetron radars. The working principle of the code is explained in mathematical terms and with the help of a simplified model. Results from the SMPRF and traditional fixed PRF weather radar measurements are compared, and the reasons for the differences are explained. The practical results show that the SMPRF code seems to work in the manner that is predicted by the theoretical and model calculations. The SMPRF code provides enough information to produce a high-resolution measured spectrum for each range gate. The shape of these measured spectra are seldom purely Gaussian. It is possible that more advanced raw products, other than just reflectivity, velocity, and width, can be produced with the help of these high-resolution spectra.

Study of 112Cd via high-resolution and reactions and IBA model calculations

1994 ◽  
Vol 574 (3) ◽  
pp. 414-452 ◽  
Author(s):  
R. Hertenberger ◽  
G. Eckle ◽  
F.J. Eckle ◽  
G. Graw ◽  
D. Hofer ◽  
...  
Keyword(s):  
High Resolution ◽  
Model Calculations

Background-filtered transmission diffraction with internal intensity calibration

1989 ◽  
Vol 22 (2) ◽  
pp. 79-83 ◽  
Author(s):  
P. Hiismäki
Keyword(s):  
Steady State ◽  
High Resolution ◽  
Structural Parameters ◽  
Quasi Steady State ◽  
Frequency Filtering ◽  
High Quality ◽  
Model Calculations ◽  
Crystalline Sample ◽  
Internal Calibration ◽  
Transmission Geometry

It is inferred that by frequency filtering the logarithm of the time-of-flight spectrum of neutrons that have passed through a powdered isotropic crystalline sample a diffractogram may be obtained with many desirable properties for achieving high-quality refinement of structural parameters. Apart from multiple scattering no wavelength-dependent effects or corrections need to be introduced, which implies automatic internal calibration of the Bragg intensities. For utilization of the inherent high resolution of the transmission geometry, a Fourier chopper in the pulsed beam from an intensity-optimized quasi-steady-state moderator is suggested. Results of model calculations are presented.

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