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Author : Anonim
Publisher : Unknown
Page : 58 pages
File Size : 47,9 Mb
Release : 2002
Category : Atmospheric turbulence
ISBN : UCSD:31822032512527
Author : Elena Masciadri,Marc Sarazin
Publisher : Imperial College Press
Page : 415 pages
File Size : 55,7 Mb
Release : 2009
Category : Science
ISBN : 9781848164864
This book collects most of the talks and poster presentations presented at the Optical Turbulence OCo Astronomy meets Meteorology international conference held on 15OCo18 September, 2008 at Nymphes Bay, Alghero, Sardinia, Italy. The meeting aimed to deal with one of the major causes of wavefront perturbations limiting the astronomical high-angular-resolution observations from the ground. The uniqueness of this meeting has been the effort to attack this topic in a synergic and multidisciplinary approach promoting constructive discussions between the actors of this science OCo the astronomers, meteorologists, physicists of the atmosphere and the experts in adaptive optics and interferometry techniques whose main goal is to correct, in real-time, the wavefront perturbations induced by atmospheric turbulence to restore at the telescope foci the best available image quality. Sample Chapter(s). Chapter 1: Optical Turbulence in High Angular Resolution Techniques in Astronomy (494 KB). Contents: Optical Turbulence in High Angular Resolution Techniques in Astronomy (J M Beckers); Optical Turbulence Profiles at CTIO from a 12-Element Lunar Scintillometer (P Hickson et al.); High Resolution SLODAR Measurements on Mauna Kea (T Butterley et al.); How We Can Understand the Antarctic Atmospheric? (J W V Storey et al.); The Paranal Surface Layar (J Melnick et al.); Introduction to Data Assimilation in Meteorology (P Brousseau OC L Auger); The Mauna Kea Weather Center: A Case for Custom Seeing Forecasts (T Cherubini et al.); Dealing with Turbulence: MCAO Experience and Beyond (R Ragazzoni et al.); Future-Look Science Operations for the LBT (R F Green); Surface Layer SLODAR (J Osborn et al.); and other papers. Readership: Advanced undergraduates and graduate students, and physicists working in the field of astronomy.
Author : M. Nallasamy
Publisher : Unknown
Page : 80 pages
File Size : 50,8 Mb
Release : 1985
Category : Computational fluid dynamics
ISBN : UIUC:30112106614735
Author : Jimmy D. Horne, Jr.
Publisher : Unknown
Page : 163 pages
File Size : 51,9 Mb
Release : 2004-03-01
Category : Electronic
ISBN : 142351498X
The objective of this thesis is to investigate the forecastability of optical turbulence using the U.S. Navy's Coupled Ocean Atmosphere Mesoscale Prediction System (COAMPS). First, a detailed synoptic study was performed over the Eastern Pacific region for observation periods in October 2001 and March 2002 to focus on mesoscale features affecting Vandenberg AFB. Second, a modified version of COAMPS version 2.0.16 model output was evaluated to ensure reasonable modeling of the mesoscale. Next, temperature and dewpoint temperature vertical profiles of COAMPS, modified with the Turbulent Kinetic Energy (TKE) Method, were compared with balloon-launched rawinsondes, initially, then with higher resolution thermosondes. Optical turbulence parameters were then calculated from the data and a comparison between synthetic profiles and thermosonde-derived profiles were qualitatively and quantitatively studied. Then the vertical resolution of the model was increased for selected forecasts to determine the potential for forecast improvement.
Author : Richard J. Sasiela
Publisher : SPIE-International Society for Optical Engineering
Page : 394 pages
File Size : 52,7 Mb
Release : 2007
Category : Mathematics
ISBN : 0819467286
At first glance, Mellin transforms can look formidable and complicated. This book invites readers to overcome these fears and see just how useful they can be. It is suitable for two audiences: those interested in problems surrounding electromagnetic wave propagation in turbulence, and those interested in evaluating integrals.
Author : Aamir Shabbir
Publisher : Unknown
Page : 34 pages
File Size : 55,6 Mb
Release : 1992
Category : Reynolds stress
ISBN : UIUC:30112059174513
Author : Anonim
Publisher : Unknown
Page : 220 pages
File Size : 48,7 Mb
Release : 1998
Category : Naval research
ISBN : UCAL:$C4057
Author : Arun K. Majumdar,Jennifer C Ricklin
Publisher : Springer Science & Business Media
Page : 429 pages
File Size : 46,9 Mb
Release : 2010-05-05
Category : Science
ISBN : 9780387286778
This is a comprehensive tutorial on the emerging technology of free-space laser communications (FSLC). The book offers an all-inclusive source of information on the basics of FSLC, and a review of state-of-the-art technologies. Coverage includes atmospheric effects for laser propagation and FSLC systems performance and design. Free-Space Laser Communications is a valuable resource for engineers, scientists and students interested in laser communication systems designed for the atmospheric optical channel.
Author : Lin Zhang,Xiao Song,Yunjie Wu
Publisher : Springer
Page : 651 pages
File Size : 51,8 Mb
Release : 2016-09-21
Category : Computers
ISBN : 9789811026690
This four-volume set (CCIS 643, 644, 645, 646) constitutes the refereed proceedings of the 16th Asia Simulation Conference and the First Autumn Simulation Multi-Conference, AsiaSim / SCS AutumnSim 2016, held in Beijing, China, in October 2016. The 265 revised full papers presented were carefully reviewed and selected from 651 submissions. The papers in this third volume of the set are organized in topical sections on Cloud technologies in simulation applications; fractional calculus with applications and simulations; modeling and simulation for energy, environment and climate; SBA virtual prototyping engineering technology; simulation and Big Data.
Author : Ching Jen Chen
Publisher : CRC Press
Page : 312 pages
File Size : 54,9 Mb
Release : 1997-12-01
Category : Technology & Engineering
ISBN : 1560324058
Focuses on the second-order turbulence-closure model and its applications to engineering problems. Topics include turbulent motion and the averaging process, near-wall turbulence, applications of turbulence models, and turbulent buoyant flows.
Author : A. Arockia Bazil Raj
Publisher : Walter de Gruyter GmbH & Co KG
Page : 234 pages
File Size : 46,8 Mb
Release : 2016-01-01
Category : Technology & Engineering
ISBN : 9783110450163
The book focuses on experimental modeling of atmospheric turbulence effects and mitigation of beam wandering and wavefront distortions in terrestrial free space optical communication (FSOC). This means, developing a reliable FSOC system with a necessary optoelectronic assembly to compensate the atmospheric turbulence effects, so as to practically attain the acceptable BER under any real-world open atmospheric turbulence conditions.
Author : Edmond M. Dewan
Publisher : Unknown
Page : 76 pages
File Size : 44,7 Mb
Release : 1980
Category : Atmospheric turbulence
ISBN : UOM:39015095331412
This report is a tutorial on the effects of atmospheric turbulence upon systems which rely upon the propagation of LASER beams. In addition to providing a simplified presentation of turbulence theory and optical effects, it describes the state of the art of the new technique of radiosonde estimation of index of refraction fluctuations. Suggestions are given for future research which will help to answer current Air Force needs. The feasibility of some laser systems will depend upon the value of r0, the coherence length (which is related to “C2n” which in turn is related to the degree of turbulence). At present, the statistics of “r0” are inadequate.
Author : Narottam Das
Publisher : BoD – Books on Demand
Page : 278 pages
File Size : 52,7 Mb
Release : 2012-03-07
Category : Technology & Engineering
ISBN : 9789535101703
Optical communications systems are very important for all types of telecommunications and networks. They consists of a transmitter that encodes a message into an optical signal, a channel that carries the signal to its destination, and a receiver that reproduces the message from the received optical signal.This book presents up to date results on communication systems, along with the explanations of their relevance, from leading researchers in this field. Its chapters cover general concepts of optical and wireless optical communication systems, optical amplifiers and networks, optical multiplexing and demultiplexing for optical communication systems, and network traffic engineering. Recently, wavelength conversion and other enhanced signal processing functions are also considered in depth for optical communications systems. The researcher has also concentrated on wavelength conversion, switching, demultiplexing in the time domain and other enhanced functions for optical communications systems. This book is targeted at research, development and design engineers from the teams in manufacturing industry; academia and telecommunications service operators/ providers.
Author : W. Rodi,N. Fueyo
Publisher : Elsevier
Page : 1029 pages
File Size : 40,6 Mb
Release : 2002-08-21
Category : Mathematics
ISBN : 9780080530949
Turbulence is one of the key issues in tackling engineering flow problems. As powerful computers and accurate numerical methods are now available for solving the flow equations, and since engineering applications nearly always involve turbulence effects, the reliability of CFD analysis depends increasingly on the performance of the turbulence models. This series of symposia provides a forum for presenting and discussing new developments in the area of turbulence modelling and measurements, with particular emphasis on engineering-related problems. The papers in this set of proceedings were presented at the 5th International Symposium on Engineering Turbulence Modelling and Measurements in September 2002. They look at a variety of areas, including: Turbulence modelling; Direct and large-eddy simulations; Applications of turbulence models; Experimental studies; Transition; Turbulence control; Aerodynamic flow; Aero-acoustics; Turbomachinery flows; Heat transfer; Combustion systems; Two-phase flows. These papers are preceded by a section containing 6 invited papers covering various aspects of turbulence modelling and simulation as well as their practical application, combustion modelling and particle-image velocimetry.
Author : A. Yoshizawa
Publisher : Springer Science & Business Media
Page : 426 pages
File Size : 45,9 Mb
Release : 2013-03-14
Category : Science
ISBN : 9789401718103
TUrbulence modeling encounters mixed evaluation concerning its impor tance. In engineering flow, the Reynolds number is often very high, and the direct numerical simulation (DNS) based on the resolution of all spatial scales in a flow is beyond the capability of a computer available at present and in the foreseeable near future. The spatial scale of energetic parts of a turbulent flow is much larger than the energy dissipative counterpart, and they have large influence on the transport processes of momentum, heat, matters, etc. The primary subject of turbulence modeling is the proper es timate of these transport processes on the basis of a bold approximation to the energy-dissipation one. In the engineering community, the turbulence modeling is highly evaluated as a mathematical tool indispensable for the analysis of real-world turbulent flow. In the physics community, attention is paid to the study of small-scale components of turbulent flow linked with the energy-dissipation process, and much less interest is shown in the foregoing transport processes in real-world flow. This research tendency is closely related to the general belief that universal properties of turbulence can be found in small-scale phenomena. Such a study has really contributed much to the construction of statistical theoretical approaches to turbulence. The estrangement between the physics community and the turbulence modeling is further enhanced by the fact that the latter is founded on a weak theoretical basis, compared with the study of small-scale turbulence.