Simplified Correlation Research Articles

États de haut spin dans 53Mn

The 40Ca( 16O, 3pγ) 53Mn reaction has been used at a beam energy of 45 MeV to search for high-spin states in 53Mn. By means of the techniques of in-beam γ-ray spectroscopy, the excitation functions, γ-γ coincidences, angular distributions, linear polarizations and simplified triple angular correlations were measured. A new decay scheme for high-spin states is given. For the following levels (MeV), we deduced spin-parity assignments; 2.56, 13 2 − (confirmed); 3.44, 15 2 −; 4.38, ( 17 2 −); 5.61 ( 19 2 −); 6.53, ( 21 2 −); 7.00, ( 23 2 −). Mixing ratios are also reported. It is only with this spin sequence that the experimental populations of these states are well reproduced by compound nucleus evaporation calculations. High-spin states are successfully interpreted by including neutron excitations out of the f 7 2 shell.

The spinless periodic Anderson model with phonons and applications to mixed valence systems

A simplified periodic Anderson model, without spin and Hubbard correlation, coupled to a branch of optical phonons is presented and discussed in connection with Rare Earth compounds exhibiting a transition to a mixed valence state. The phonon self energy is approximately calculated by diagrammatic techniques and used for a study of boson modes originating from the interplay of phonons withf-electrons mixed into band states. It is shown that weakly damped low lying or even soft modes may exist in connection with the transition. The relevance of these results to real systems, possible shortcomings of the model and the relations to other work in this field is described.

Single-Set Treatment of All Available Binary System VLE Data Leads to Simplified Correlation Procedures

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-Set Treatment of All Available Binary System VLE Data Leads to Simplified Correlation ProceduresHal Ozkardesh, Ramanathan R. Tarakad, and Stanley B. AdlerCite this: Ind. Eng. Chem. Fundamen. 1978, 17, 3, 206–209Publication Date (Print):August 1, 1978Publication History Published online1 May 2002Published inissue 1 August 1978https://doi.org/10.1021/i160067a011RIGHTS & PERMISSIONSArticle Views55Altmetric-Citations2LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (410 KB) Get e-Alerts

The methods of modelling for pelagic and circumlittoral marins ecosystems

The described method of modelling of marine ecosystems is based on their decomposition into hierarchial structure of subsystems each of them may be considered separately. As a result of this the simplified qualitative correlations are established between the values of their input and output variables. The inputs and outputs of subsystems models are connected through the randomizing modules taking into account the description accuracy of real object by the corresponding model. In the complete form the mathematical model of complex ecosystem is a stochastic graph, which is investigated by the method of random trajectories. On the base of analysis of complex ecosystem models the limiting and loading variables are revealed, for which it is possible then to compose the simple models, describing the characteristic peculiarity of their behaviour. This principle is used for creation of the scheme of pollution action on marine ecosystems.

Reactor gamma noise studies

A review is given of reactor gamma noise studies, with the main emphasis laid on experience gained from subcritical reactors at Otaniemi, Finland, along with a survey of the development of stochastic models, numerical studies and gamma noise measurements. Within the framework of a space-independent two-energy-group model that has been developed, all of the simplified correlation functions associated with the detector signals i j and i 1 assume the form 〈 i j ( t). i 1( t + τ)〉 = A + B 1 exp (− ω 1 τ) + B 2 exp (− ω 2 τ); the subindices 1 and 2 here refer to the fast and thermal groups of neutrons respectively. The detection model includes the detection of gamma rays, thermal neutrons and fast neutrons, absorption, recoil and fission type detectors, gamma-compensated detectors, and response fluctuations. Explicit expressions are given in regard to the influence of a large number of reactor and detector parameters. The gamma radiation, which is emitted with long delay, can be regarded as spurious, and in the main degrades measurement quality. With respect to detector effects, the model further provides some insight into the analysis of power reactor noise. It has been experimentally confirmed that information on the thermal and fast groups of neutrons in a thermal reactor is derivable from noise measurements by means of photon detection, or alternatively the joint use of thermal neutron and photon detection. Ex-core measurements, and measurements on fast reactors, have also been effected. The use of gamma detection in reactor noise measurements may be regarded as a complement to and a substitute for thermal neutron and fast neutron detection. Other distinct and useful features of gamma detection include the possibility of acquiring energy-sensitive detectors with excellent time resolution, the possibility of making use of energy selection by the agency of electronic amplitude discrimination, the relatively small disturbance in the system that arises from a gamma detector, particularly in ex-core measurements, and the great relaxation length of high energy photon radiation as compared with thermal neutrons.

Convective Heat Transfer From a Desert Surface

The convective heat transfer relations for atmospheric flow over sparsely vegetated areas are reviewed and compared to existing relations for flow in rough ducts. Experimental convection coefficients obtained at four desert sites are compared to the analytical relations. The experimental equipment for measuring the heat transfer convection coefficient between air and ground in a desert environment consists of two electrically heated plates positioned flush with the ground. Measurements of power dissipation and surface temperatures allow direct calculation of the convection coefficient. The experimental heat transfer results are correlated with micrometeorological models from which a soil roughness height is calculated. This roughness parameter is shown to characterize air flow near the soil surface, and may be significantly different from the roughness parameter ordinarily determined from velocity profiles. A simplified heat transfer correlation is presented for desert surfaces.

On-line microvascular blood cell flow velocity measurement by simplified correlation technique

The velocity of red blood cells in the microvasculature was measured by the dualslit photometric technique. The time delay to maximum crosscorrelation was determined on-line with a simplified correlator which utilizes a digital delay line and simplified multipliers. The correlation is computed over eight delay channels. Results are comparable to those obtained with 100-channel commercial correlation computers.

A Short Cut to Stabilized Gas Well Productivity

Here are simplified correlations that quickly provide correction factors for obtaining stabilized productivity from short-term flow tests. The only data needed to use the correlations are reservoir pressure, duration of test, and estimated permeability. Introduction For most studies involving gas wells and gas reservoirs, a very important consideration is the stabilized productivity or the ability to deliver gas for a productivity or the ability to deliver gas for a considerable time against a given backpressure. This knowledge is usually most needed in the early stages of development of an area, before extensive well test data or production information can be collected. Even in fields with considerable history, an engineer may frequently need a long-range performance prediction without having access to any data except the short-term test data normally required by state regulatory bodies. Short-term test data typified by a four-point back pressure with only 1 or 2 hours' flow on a point, or pressure with only 1 or 2 hours' flow on a point, or even a one-point 24-hour test may be grossly in error in low permeability reservoirs. Much of our nation's gas reserves is contained in the San Juan, Anadarko and Arkoma basins, which have the common characteristic of low permeability. In these areas it is not at all unusual for a well to require 30 days' flowing time to reach stabilization. Use of short-term test data for such wells would obviously lead to poor-quality estimates of either producing rates or reserves. The long-term flow test, to actually achieve stable flow, may be impractical for any of several reasons. The next best alternative would probably be two-rate flow tests. These require collection of detailed and closely controlled test data and can be costly even though much less time-consuming than the long-term flow to stable conditions. Another possible approach would be to determine interwell permeability and a skin factor from a pressure buildup test. Substitution of these factors with estimates of other reservoir parameters in the Darcy steady-state flow equation parameters in the Darcy steady-state flow equation would provide a reasonable estimate of stable flow capacity. In the absence of adequate field test data to define stabilized producing capacity, a stabilization factor to apply to short-term flow data would be useful; and that is the subject of this paper. For a stabilization factor to be most useful, it should be determinable with a minimum of field test data and calculation and still retain a reasonable degree of accuracy. Correlations have been developed that fulfill the requirement of minimum data and calculation. A check of the correlations with test data from several fields indicates a fair degree of accuracy. Basis for Correlations The well known Darcy steady-state flow equation neglecting turbulence may be written for gas wells as follows: (1) This equation and all others here are in practical field units and the terms are in the nomenclature. In the equation s is the skin factor defined by van Everdingen. JPT P. 537

Optimum Arrangement of Rectangular Fins on Horizontal Surfaces for Free-Convection Heat Transfer

Experimental average heat-transfer coefficients for free-convection cooling of arrays of isothermal fins on horizontal surfaces over a wider range of spacings than previously available are reported. A simplified correlation is presented and a previously available correlation is questioned. An optimum arrangement for maximum heat transfer and a preliminary design method are suggested, including weight considerations.

Comments on "A simplified optical correlator for radar-signal processing"

Comments on "A simplified optical correlator for radar-signal processing"

A simplified optical correlator for radar-signal Processing

Radar-signal processing is an interesting application of optical correlators. A simplified optical correlator is described and experimental results are presented.

A Simplified Coherent Optical Correlator

The basic theory plus a few nonreal time experimental results of a coherent optical analog correlator consisting of only a ngle transforming lens are given. The two spatial signals to be correlated were written on two side-by-side photographic transparencies (an ultrasonic light modulator may be employed for real time operation). Two types of spatial carriers were used to separate the desired correlation signal from spurious signals in the output diffraction plane. Frequency shift of one input signal may be determined by measuring the spatial shift of the output diffraction pattern.

Note on Use of phi as a Simplified Partial Rank Correlation Coefficient

Use of phi as a simplified partial rank correlation coefficient is described and illustrated.

A real time seismic array data analyser and its associated event selector

A specialized data processing machine is being developed, which will be capable of using data from an array of seismometers to derive information on the direction of arrival, phase velocity and energy-time distribution of body waves from distant seismic events. The organization and method of operation of the machine are described and reasons for the choice of system are discussed. A simplified correlator which automatically selects events from the background noise has been in operation for some time. A description of this unit and some results obtained with it are presented.

Simplified correlations for linear polyethylene

High-density polyethylenes have shown a linear relationship between molecular weight and the logarithm of melt flow index. The range of Mw was 50,000–125,000. This provides a simplified rapid tool for characterization of linear polyethylenes. Other viscometric relationships are also analyzed.

Die berechnung der eichkurven röntgen-fluoreszenz intensität/konzentration in gemischen

Abstract For the correlation between fluorescent X-ray intensity and chemical composition an arithmetic correlation has been developed. The calculated intensities are expressed as fractions of the total intensity of the pure element, and they have been tested with measured intensities of samples, prepared for different chemical compositions. In most cases (i.e. with or without negligible interelement enhancement) the calculated correlation will give the chemical composition within 2–3 weight per cent. A rapid quantitative trace analysis of heavy elements (atomic number ⩾ 20) in organic substances, in liquids or in other samples is made possible by using a simplified quantitative correlation.

Flow of steam‐water mixutures in a heated annulus and through orifices

AbstractValues of total pressure drop are presented for the flow of vaporizing water in an internally heated 1‐in. I.D. by 1½‐in. O.D. annulus at mass velocities of 270 to 1,440, lb./(sec.)(sq.ft.), pressures of 9 to 180 lb./sq. in., and up to 0.34 fraction by weight vaporized. The total heated length over which boiling took place was as large as 6 ft. There is no evidence of “sonic” pressure jumps at the outlet. The results for the annulus mentioned lie within +30 to −11% of the Lockhart‐Martinelli curve at higher qualities and with ±45% of the correlation at lower qualities where the actual quality is more uncertain. A simplified correlation in terms of quality and volume fraction of liquid predicted the two‐phase frictional pressure drops with an average error of 41%.It was found that the ratio of the two‐phase pressure drop through a 0.3‐in. orifice to the drop with no vaporization was approximately a linear function of the quality in the vena contracta but was only one tenth to one third as great as would be predicted if the mixture were to expand as a homogeneous fluid. Prediction of orifice presure drops is improved if slip between vapor and liquid is considered.