Sedimentation and electrophoresis of interacting substances III. Sedimentation of a reversibly aggregating substance with concentration dependent sedimentation coefficients

1963 ◽  
Vol 276 (1366) ◽  
pp. 354-366 ◽  
Keyword(s):  
Experimental Results ◽  
Β Lactoglobulin ◽  
Theory And Experiment

The sedimentation of a reversibly aggregating substance is discussed on the basis of a model in which diffusion is neglected, as in an earlier theory, but in which concentration dependent sedimentation coefficients are now included. In addition, the effect of non-aggregating impurities is assessed. Sedimentation velocities calculated by computer for the model have been compared with published experimental results for β-lactoglobulin A and agreement has been found between theory and experiment.

Unbalance Response of a Dual Rotor System: Theory and Experiment

1993 ◽  
Vol 115 (4) ◽  
pp. 427-435 ◽  
Author(s):  
K. Gupta ◽  
K. D. Gupta ◽  
K. Athre
Keyword(s):  
System Theory ◽  
Transfer Matrix ◽  
Mode Shape ◽  
Reasonable Agreement ◽  
Complex Variables ◽  
Rotor System ◽  
Experimental Results ◽  
Unbalance Response ◽  
Theoretical Results ◽  
Theory And Experiment

A dual rotor rig is developed and is briefly discussed. The rig is capable of simulating dynamically the two spool aeroengine, though it does not physically resemble the actual aeroengine configuration. Critical speeds, mode shape, and unbalance response are determined experimentally. An extended transfer matrix procedure in complex variables is developed for obtaining unbalance response of dual rotor system. Experimental results obtained are compared with theoretical results and are found to be in reasonable agreement.

The statistical thermodynamics of solutions of non-spherical molecules. I. The thermodynamic functions

1955 ◽  
Vol 229 (1177) ◽  
pp. 271-280 ◽  
Keyword(s):  
Carbon Tetrachloride ◽  
Equation Of State ◽  
Thermodynamic Functions ◽  
Statistical Thermodynamics ◽  
Intermolecular Forces ◽  
Pure Component ◽  
Experimental Results ◽  
Thermodynamics Of Solutions ◽  
Theory And Experiment

The perturbation treatment of the orientational forces between non-spherical molecules proposed by Cook & Rowlinson (1953) is extended to mixtures by using the theory of solutions put forward by Longuet-Higgins (1951). The thermodynamic functions and the equation of state of such mixtures are expressed in terms of the intermolecular forces and the properties of one pure component. Expressions are derived for the excess (or non-ideal) thermodynamic functions which are compared with the experimental results on the four solutions, benzene+ cyclohexane , benzene+carbon tetrachloride, benzene + ethylene dychloride, and cyclohexane + carbon tetrachloride. The agreement between theory and experiment is improved by taking account of the orientational forces.

CPC and SMPS Systems of Monitoring Airborne Nanoparticles-Theory and Experiment

2011 ◽  
Vol 101-102 ◽  
pp. 60-66
Author(s):  
Yi Jui Chiu ◽  
Khai Shoon Leong ◽  
Luh Maan Chang
Keyword(s):  
Experimental Results ◽  
Nano Particles ◽  
Particle Counter ◽  
Condensation Particle Counter ◽  
New Device ◽  
Advantages And Disadvantages ◽  
Mean Diameter ◽  
Airborne Nanoparticles ◽  
Theory And Experiment

The purpose of this paper is to assess technologies used in the monitoring of nano-particles that are available commercially and under research. The goal of the assessment is to propose a new device based on the technologies assessed. The assessment is performed based on information obtained from literatures review of articles and brochures, and from communications with representatives of the manufacturers of the counters. Two types of nano-particles counters were assessed; counters that are currently commercially available are the condensation particle counter (CPC), the scanning mobility particle spectrometer (SMPS). A description of how each counter works is given, and the advantages and disadvantages are highlighted. Experimental results showed that the performance of capillary had been installed and cleaned. The SMPS mean diameter fell within the range of the NIST standard. The sample offered well distribution in 300 and 400 nm.

scholarly journals Weak-value amplification: state of play

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
George C. Knee ◽  
Joshua Combes ◽  
Christopher Ferrie ◽  
Erik M. Gauger
Keyword(s):  
Quantum Theory ◽  
Signal Amplification ◽  
Weak Measurement ◽  
Experimental Results ◽  
Weak Values ◽  
Theoretical Studies ◽  
Weak Value ◽  
Metrological Performance ◽  
Weak Value Amplification ◽  
Theory And Experiment

AbstractWeak values arise in quantum theory when the result of a weak measurement is conditioned on a subsequent strong measurement. The majority of the trials are discarded, leaving only very few successful events. Intriguingly those can display a substantial signal amplification. This raises the question of whether weak values carry potential to improve the performance of quantum sensors, and indeed a number of impressive experimental results suggested this may be the case. By contrast, recent theoretical studies have found the opposite: using weak-values to obtain an amplification generally worsens metrological performance. This survey summarises the implications of those studies, which call for a reappraisal of weak values’ utility and for further work to reconcile theory and experiment.

Stress concentration factors of shallow grooves in torsion

1977 ◽  
Vol 12 (1) ◽  
pp. 41-44 ◽  
Author(s):  
H Okubo ◽  
A Kato
Keyword(s):  
Stress Concentration ◽  
Experimental Results ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Theory And Experiment

The stress concentration factors at long shallow circumferential grooves in round shafts under torsion have been investigated by theory and experiment. The discrepancies between theoretical and experimental results are discussed, and the results are also compared with Neuber's solution.

Nitrogen Nuclear Quadrupole Interactions in RDX, β-HMX and Cocaine Systems

1997 ◽  
Vol 52 (3) ◽  
pp. 241-248
Author(s):  
Ranjit Pati ◽  
T. P. Das ◽  
N. Sahoo ◽  
S.N. Ray
Keyword(s):  
Single Crystal ◽  
Quantitative Agreement ◽  
Experimental Results ◽  
Coupling Constants ◽  
Hartree Fock ◽  
Quadrupole Interactions ◽  
Nuclear Quadrupole Interactions ◽  
Electron Distributions ◽  
Nuclear Quadrupole ◽  
Theory And Experiment

AbstractUsing the Hartree-Fock-Roothaan procedure, the nuclear quadrupole interactions (NQI) of the 14N (I = 1) nucleus in the energetically important molecules RDX, β-HMX and the physiologically important molecule Cocaine, are studied. The coupling constants (e2 q Q) and asymmetry parameters (η) for the three ring nitrogens in RDX are found to be -5.671, -5.808 and -5.838 MHz and 0.542, 0.556 and 0.562, respectively, in good quantitative agreement with the experimental results of 5.735, 5.799 and 5.604 MHz for the magnitudes of e2qQ and 0.6215, 0.6146 and 0.6024 for η obtained in the single crystal. For β-HMX, where two sets of e2 q Q and η are expected from symmetry considerations, our calculated values are -5.936 and -6.069 MHz for e2 q Q and 0.432 and 0.490 for η , compared to experimentally measured magnitudes of 5.791 and 6.025 MHz and η-values of 0.4977 and 0.5180, respectively, obtained in the single crystal. For Cocaine free base which contains only one 14N nucleus, our calculated values of e2 qQ and η are -5.038 MHz and 0.067, in very good agreement with the experimental results of 5.0229 MHz for the magnitude of e2 q Q and 0.0395 for η. Possible reasons for the small remaining differences between theory and experiment in e2 q Q and η for all three systems and the significant differences in trends over the three nitrogens in RDX between theory and experiment are discussed. Also, the calculated quadrupole interaction parameters for the 14N nuclei in the NO2 groups outside the ring for both RDX and β-HMX are presented with the hope that they will be measured in the future to provide a more complete understanding of the electron distributions in these systems.

Vibration Control of a String Using Zero-Displacement Constraint at a Point Near One Boundary: Theory and Experiment

2012 ◽  
Author(s):  
Assaad AlSahlani ◽  
Frank B. Mathis ◽  
Ranjan Mukherjee
Keyword(s):  
Total Energy ◽  
Vibration Control ◽  
Vibration Suppression ◽  
Full Length ◽  
Experimental Results ◽  
The Other ◽  
Boundary Theory ◽  
Displacement Constraint ◽  
Simulation Results ◽  
Theory And Experiment

A new method for vibration control of a string is proposed in which a zero displacement constraint is sequentially applied and released at a point near one boundary. When the constraint is applied, the string is partitioned into two vibrating strings, one of them is much shorter in length than the other. The vibration in the shorter segment of the string decays out much faster than the longer segment due to higher frequency. After the vibration in the shorter segment has decayed, the constraint is removed and the string is allowed to vibrate in its full length. The total energy is now redistributed over the full length, and this provides the scope for application of the constraint again for further reduction of energy. Vibration suppression is achieved through sequential application and removal of the constraint and this is simulated using a linear damped model of the string. Experiments were conducted and the experimental results were found to match well with simulation results.

Broadening and shifting of the Raman Q branch in pure D2 and D2–He mixtures, I: experimental results and comparison with theory

1994 ◽  
Vol 72 (11-12) ◽  
pp. 885-890 ◽  
Author(s):  
P. M. Sinclair ◽  
P. Duggan ◽  
M. Le Flohic ◽  
J. W. Forsman ◽  
J. R. Drummond ◽  
...  
Keyword(s):  
Experimental Data ◽  
Experimental Results ◽  
Lorentzian Profile ◽  
Linear Fit ◽  
And Shifts ◽  
Theory And Experiment

We report the broadening and shifting of the Raman Q-branch lines in D2 and D2–He mixtures, all at 305.2 K. The width and shift of each line were extracted by fitting a simple Lorentzian profile to the experimental data. From a linear fit of the widths and shifts as a function of density we have determined broadening and shifting coefficients with an uncertainty of ±0.5%. None of the existing semiclassical or quantal calculations agree with the measurements at this level of accuracy. It is pointed out that the removal of certain approximations in the calculations should bring theory and experiment into closer agreement.

Rotational Inviscid Flow in a Variable Area Annulus, Pipe or Channel

1980 ◽  
Vol 102 (4) ◽  
pp. 473-477 ◽  
Author(s):  
B. R. Munson
Keyword(s):  
Velocity Profile ◽  
Cross Section ◽  
Flow Separation ◽  
Reverse Flow ◽  
Inviscid Flow ◽  
Variable Cross Section ◽  
Experimental Results ◽  
Variable Cross ◽  
Vortex Lines ◽  
Theory And Experiment

Theoretical and experimental results concerning rotational inviscid flow in an annulus, pipe or channel of variable cross-section are given. Vorticity and continuity considerations are used to determine the velocity profile downstream from the variable area portion in terms of the velocity profile upstream. The lengthening or shortening of vortex lines alters the vorticity in the flow. Regimes of possible reverse flow and flow separation are obtained. The agreement between the theory and experiment is good.

Classical vibrational modes in phononic lattices: theory and experiment

2005 ◽  
Vol 220 (9-10) ◽  
Author(s):  
Mihail Sigalas ◽  
Manvir S. Kushwaha ◽  
Eleftherios N. Economou ◽  
Maria Kafesaki ◽  
Ioannis E. Psarobas ◽  
...  
Keyword(s):  
Phononic Crystals ◽  
Experimental Results ◽  
Vibrational Modes ◽  
Self Consistent ◽  
Independent Individual ◽  
Theory And Experiment

AbstractWe present a review, through selected illustrative examples, of the physics of classical vibrational modes in phononic lattices, which elaborates on the theory, the formalism, the methods, and mainly on the numerical and experimental results related to phononic crystals. Most of the topics addressed here, are written in a self-consistent way and they can be read as independent individual parts.

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