Acoustic performance predictions via a general theory for the scattering of sound by sound with experimental data from an operational parametric sonar system.

2010 ◽  
Vol 127 (3) ◽  
pp. 1986-1986
Author(s):  
Harvey C. Woodsum
Keyword(s):  
Experimental Data ◽  
General Theory ◽  
Acoustic Performance ◽  
Sonar System ◽  
Performance Predictions ◽  
Parametric Sonar

Effect of finite boundaries on the Stokes resistance of an arbitrary particle

1962 ◽  
Vol 12 (1) ◽  
pp. 35-48 ◽  
Author(s):  
Howard Brenner
Keyword(s):  
Experimental Data ◽  
General Theory ◽  
Spherical Particle ◽  
Principal Axis ◽  
Wall Effect ◽  
Wall Proximity

A general theory is put forward for the effect of wall proximity on the Stokes resistance of an arbitrary particle. The theory is developed completely for the case where the motion of the particle is parallel to a principal axis of resistance. In this case, the wall-effect correction can be calculated entirely from a knowledge of the force experienced by the particle in anunboundedfluid, providing (i) that the wall correction is already known for a spherical particle and (ii) that the particle is small in comparison to its distance from the boundary. Experimental data are cited which confirm the theory. The theory is extended to the wall effect on a particlerotatingnear a boundary.

Navier-Stokes and Comprehensive Analysis Performance Predictions of the NREL Phase VI Experiment

2003 ◽  
Author(s):  
Earl P. N. Duque ◽  
Michael D. Burklund ◽  
Wayne Johnson
Keyword(s):  
Experimental Data ◽  
Wind Turbine ◽  
Turbine Rotor ◽  
Operating Conditions ◽  
Navier Stokes ◽  
Horizontal Axis Wind Turbine ◽  
Performance Predictions ◽  
Nasa Ames Research ◽  
Nrel Phase Vi ◽  
Wind Turbine Rotor

A vortex lattice code, CAMRAD II, and a Reynolds-Averaged Navier-Stoke code, OVERFLOW-D2, were used to predict the aerodynamic performance of a two-bladed horizontal axis wind turbine. All computations were compared with experimental data that was collected at the NASA Ames Research Center 80-by 120-Foot Wind Tunnel. Computations were performed for both axial as well as yawed operating conditions. Various stall delay models and dynamics stall models were used by the CAMRAD II code. Comparisons between the experimental data and computed aerodynamic loads show that the OVERFLOW-D2 code can accurately predict the power and spanwise loading of a wind turbine rotor.

Simulation and analysis of optical imaging systems including real freeform components

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Johannes Stock ◽  
Matthias Beier ◽  
Johannes Hartung ◽  
Sebastian Merx ◽  
Herbert Gross
Keyword(s):  
Experimental Data ◽  
Spatial Frequency ◽  
Optical System ◽  
System Performance ◽  
Imaging Systems ◽  
Optical Surfaces ◽  
Surface Imperfections ◽  
Performance Predictions ◽  
Alignment Errors ◽  
Holistic Description

Abstract In recent years, the precision of the manufacturing process for optical surfaces has improved tremendously. As a result, freefrom surfaces have become more attractive options for imaging applications with increased accuracy requirements. However, with regards the integration into an optical system, performance is often limited due to surface imperfections, such as mid-spatial frequency errors and alignment errors. This demonstrates the need for a more holistic description of systems, including multiple freeform components, which enable performance predictions based on the system as a whole. In this work, a solution for such a simulation is presented and verified by a comparison with the experimental data. This procedure not only predicts system performance but also supports tolerancing and easier alignment.

scholarly journals III . Mathematical contributions to the theory of evolution.—XII. On a generalised Theory of alternative Inheritance, with special reference to Mendel's laws

1904 ◽  
Vol 203 (359-371) ◽  
pp. 53-86 ◽  
Keyword(s):  
Experimental Data ◽  
General Theory ◽  
Special Reference ◽  
Mathematical Theory ◽  
Individual Case ◽  
Experimental Results ◽  
Theory Of Evolution ◽  
Original Theory ◽  
Growing Mass ◽  
Mendel’S Laws

It seems likely to be of interest at the present time to consider rather at length a fairly full mathematical theory of the pure gamete. We do not venture to call this theory a generalised Mendelian theory of inheritance, partly because it is not even the most general theory of the pure gamete conceivable, partly because Mendel’s original theory of heredity was perfectly clear and perfectly simple, and is not the theory here developed. The pure and simple Mendelian theory seems to have been discarded in the light of recent experimental results by more than one Mendelian, both in this country and abroad. The original Mendelian theory has been replaced by what are termed “ Mendelian Principles.” In this aspect of investigation the fundamental principles propounded by Mendel are given up, and for each individual case a pure gamete formula of one kind or another is suggested as describing the facts, This formula is then emphasised, modified or discarded, according as it fits well, badly, or not at all with the growing mass of experimental data. It is quite clear that it is impossible while this process is going on to term anything whatever Mendelian as far as theory is concerned.

On the thermodynamics of crystalline lattices

1955 ◽  
Vol 233 (1194) ◽  
pp. 418-427 ◽  
Keyword(s):  
Experimental Data ◽  
High Temperature ◽  
Phase Space ◽  
General Theory ◽  
Thermodynamic Functions ◽  
Crystalline Lattice ◽  
Dynamical Matrix ◽  
Temperature Behaviour ◽  
Cubic Symmetry ◽  
Cubic Lattice

The thermodynamic functions for an ideal crystalline lattice satisfying the Born cyclic boundary conditions are formulated in terms of phase-space averages of functions of the trace of the dynamical matrix. An approximate method of evaluating these averages is suggested, which takes on an especially simple form in the case of lattices with cubic symmetry. The general theory is applied to the case of the monatomic face-centred cubic lattice and used to determine the five microscopic force constants occurring in the dynamical matrix for aluminium. These are computed from experimental data on the elastic constants and high-temperature behaviour of the specific heat and calorimetric entropy.

scholarly journals Experiments on the symmetry of length and time

2021 ◽  
Author(s):  
Li Chunhong
Keyword(s):  
Experimental Data ◽  
Quantum Mechanics ◽  
General Theory ◽  
Piezoelectric Sensor ◽  
Atomic Scale ◽  
Theory Of Relativity ◽  
General Theory Of Relativity ◽  
Speed Of Light ◽  
Time Coordinate ◽  
Time Position

Abstract The F - t curve obtained from the process of applying and releasing force to the piezoelectric sensor shows that in the atomic scale, the time coordinate is equivalent to the position coordinate. The time-position coordinate relationship calculated by the experimental data is consistent with the geometric unit obtained in the general theory of relativity, thus the experiment verifies the symmetry of length and time,and connection between the microscopic - quantum mechanics and the macroscopic - general theory of relativity, and a new method for calculating the speed of light is obtained.

Near-perfect simultaneous measurement of a qubit register

2006 ◽  
Vol 6 (6) ◽  
pp. 465-482
Author(s):  
M. Acton ◽  
K.-A. Brickman ◽  
P.C. Haljan ◽  
P.J. Lee ◽  
L. Deslauriers ◽  
...  
Keyword(s):  
Experimental Data ◽  
General Theory ◽  
Quantum Computation ◽  
Fluorescence Detection ◽  
Simultaneous Measurement ◽  
Qubit State ◽  
Photon Detection ◽  
Charge Coupled Device ◽  
State Measurement ◽  
Intensified Charge Coupled Device

Simultaneous measurement of multiple qubits stored in hyperfine levels of trapped ^{111}Cd^+ ions is realized with an intensified charge-coupled device (CCD) imager. A general theory of fluorescence detection for hyperfine qubits is presented and applied to experimental data. The use of an imager for photon detection allows for multiple qubit state measurement with detection fidelities of greater than $98\%$. Improvements in readout speed and fidelity are discussed in the context of scalable quantum computation architectures.

scholarly journals Analysis of Hydrodynamic Journal Bearings Considering Lubricant Supply Conditions

1993 ◽  
Vol 207 (2) ◽  
pp. 93-101 ◽  
Author(s):  
J C P Claro ◽  
A A S Miranda
Keyword(s):  
Experimental Data ◽  
Mass Flow ◽  
Finite Differences ◽  
Laboratory Tests ◽  
Journal Bearings ◽  
Experimental Measurements ◽  
Supply Pressure ◽  
Load Line ◽  
Performance Predictions

A method of analysis of steadily loaded hydrodynamic journal bearings with a single axial groove (either on the load line or at 90° to the load line) or two diametrically opposed axial grooves is described. The method is based on Elrod's cavitation algorithm (which ensures conservation of mass flow in both the full film and the cavitated regions) and is able to accommodate specified lubricant supply conditions, namely groove size and location and supply pressure. Special attention has been given to the determination of flowrate. The equation governing the distribution of pressure around the bearing has been solved numerically using a finite differences approximation and multi-grid techniques to accelerate the convergence of the solution. Performance predictions of the analysis are compared with published experimental data and with experimental measurements obtained in laboratory tests carried out by the authors. The data used cover all grooving arrangements studied.

Sign in / Sign up

Export Citation Format

Share Document