Showing papers by "Stevens Institute of Technology published in 1975"
TL;DR: This article presents description and analysis of the Cumulative Sum, Economic design of X-bar control charts, Acceptance and Multi-Characteristic charts developed in the last three decades.
Abstract: In the last three decades several control chart procedures were developed. Prominent among these, are the Cumulative Sum, Economic design of X-bar control charts, Acceptance and Multi-Characteristic charts. This article presents description and analysis..
92 citations
TL;DR: Transformations which map noisy feature points originating from the same curve in a picture into dense regions are considered and their properties are treated as they relate to subsequent clustering to detect curves in the original picture.
65 citations
TL;DR: In this paper, a formal solution to the Einstein gravitational field equations is developed for the metric tensor, which satisfies the deDonder coordinate conditions and the Trautman outgoing radiation condition.
Abstract: By means of a formal solution to the Einstein gravitational field equations a slow motion expansion in inverse powers of the speed of light is developed for the metric tensor. The formal solution, which satisfies the deDonder coordinate conditions and the Trautman outgoing radiation condition, is in the form of an integral equation which is solved iteratively. A stress-energy tensor appropriate to a perfect fluid is assumed and all orders of the metric needed to obtain the equations of motion and conserved quantities to the 21/2post-Newtonian approximation are found. The results are compared to those obtained in another gauge by S. Chandrasekhar. In addition, the relation of the fast motion approximation to the slow motion approximation is examined.
64 citations
TL;DR: Trichloroacetyl isocyanate (TAI) has been found to be a useful in situ derivatizing reagent for the 13 C NMR studies on alcohols, phenols and amines as discussed by the authors.
52 citations
TL;DR: In this paper, the fine structure of the current sheath, specifically, the luminous filaments that can be observed on it and the associated magnetic field, has been shown to play a crucial role in the acceleration mechanism of the deuterium particles.
Abstract: Two different trends characterize, in the recent literature, the various, tentative explanations for the high yield of x rays and neutrons from D(d, n)He 3 reactions in the dense deuterium plasma produced by coaxial accelerators.l\" According to one point of view, x rays and neutrons are produced in a rather uniform, columnar region, with a mean diameter ranging from a few millimeters in the stage of maximum axial compression, up to 1-2 em at somewhat later times, when thermalization is established and neutron production is still close to peak values. 1 Suggested heating processes are based on plasma waves, instabilities, and turbulence, besides adiabatic compression, to account for the plasma heating to thermonuclear-reaction conditions. Within this line of thought, little or no importance is given to the fine structure observed 1,2.5,6 inside the plasma columnar region during the stage of neutron production and on the current sheath which forms this column. The fine structure, whatever its consistency, is then considered an intermediate stage in the heating process with no bearing on the final reacting conditions of the plasma. This seems to be the dominating point of view in most of the laboratories that are working today with plasma coaxial accelerators or with equivalent devices, A second point of view has been put forward, among others, by the group working at Stevens Institute of Technology. According to this point of view, the fine structure of the current sheath-specifically, the luminous filaments that can be observed on it and the associated magnetic field-have a paramount role in the acceleration mechanism of the plasma particles. Experimental evidence indicates that high-energy electrons and deuterium ions up to and above nuclearreaction threshold are concentrated in localized regions of the current-sheath during the neutron production time. Consistently, the particle acceleration can be due to the decay of the magnetic field, which has a complex filamentary structure on the current-sheath. If this is the case, one must accept that a substantial amount of energy is concentrated in the field structure of the current sheath up to the time of and during the neutron production stage, or at least that the energy is transferred from field to particles inside localized regions of the current sheath.
41 citations
TL;DR: In this article, the Backlund transformation for the equation of the motion for the nonlinear lattice under the influence of the weak dislocation potential is discussed, and a recursion formula to obtain a ladder of kind solutions is constructed.
Abstract: The Backlund transformation for the equation of the motion for the nonlinear lattice under the influence of the weak dislocation potential is discussed. It is found that Backlund transformation is derived from Riccati form of inverse method and that a recursion formula to obtain a ladder of kind solutions is constructed. An infinite number of conservation laws is obtained.
22 citations
TL;DR: The data and various calculated parameters show that levan from Streptococcus salivarius is highly branched and behaves hydrodynamically as a compact particle of spherical symmetry.
Abstract: The molecular weights and radii of gyration of Streptococcus salivarius levan fractions were obtained from light-scattering measurements in water. Sedimentation coefficients and partial specific volumes of the fractions were also obtained. Double logarithmic plots of [η] versus Mw and S0 versus Mw yielded slopes having values of 0.17 and 0.62, respectively. The data and various calculated parameters show that levan from Streptococcus salivarius is highly branched and behaves hydrodynamically as a compact particle of spherical symmetry.
20 citations
TL;DR: In this article, high precision adsorption isotherms of 3He and 4He on Grafoil with a monolayer of argon have been measured in the temperature range 4-20 K, using a high resolution, pressure-sensitive capacitance gauge located at 4.2 K close to the sample chamber.
Abstract: High precision adsorption isotherms of3He and4He on bare Grafoil and on Grafoil coated with a monolayer of argon have been measured in the temperature range 4–20 K, using a high resolution, pressure-sensitive capacitance gauge located at 4.2 K close to the sample chamber. This gauge obviated thermomolecular pressure effects and corrections. The isotherms yielded the following resultant data: The monolayer coverage Vm for4He on bare Grafoil was 0.42 cm3 (STP)/m2 and for3He on bare Grafoil was 0.395 cm3 (STP)/m2: the isosteric heat of adsorptionQst/R of the second layer of3He on bare Grafoil was 23.5 K andQst/R for3He on argon-coated Grafoil for the first layers was 47.5 K. Also, the data for3He and4He on bare Grafoil at and just aboveVm have been used by Novaco (see subsequent paper) for determination of the virial coefficients of the gas phase occuring in the early formation of the second layer.
20 citations
TL;DR: A light-scattering study of unfractionated and five fractions of Streptococcus salivarius levan was performed in dimethyl sulfoxide as mentioned in this paper, showing that the intrinsic viscosities [η] and root-mean-square z-average radii of gyration (Rg2)z1/2 are significantly higher in the latter than in the former.
Abstract: A light-scattering study of unfractionated and five fractions of Streptococcus salivarius levan was performed in dimethyl sulfoxide. The weight-average molecular weights Mr in dimethyl sulfoxide, after adequate dissolution, agree with those obtained in water within a mean difference of 7%. The intrinsic viscosities [η] and root-mean-square z-average radii of gyration (Rg2)z1/2 are significantly higher in dimethyl sulfoxide than in water, reflecting the higher hydrodynamic volume in the former. The Mr, [η], and (Rg2)z1/2 of the fractions suggest that levan has a low polydispersity. The exponent of 0.12 of the Mark-Houwink plot and model analysis confirm the branched and compact structure of levan.
17 citations
Brown University1, CERN2, Fermilab3, Illinois Institute of Technology4, University of Illinois at Urbana–Champaign5, Indiana University6, Johns Hopkins University7, Massachusetts Institute of Technology8, Oak Ridge National Laboratory9, Rutgers University10, Stevens Institute of Technology11, University of Tennessee12, Yale University13
TL;DR: In this paper, the authors present data on inclusive and semi-inclusive ϱ 0 production in 147 GeV/ c π − p interactions and find a total cross section of 7.3 ± 1.3 mb.
17 citations
TL;DR: The relationships between the concepts of Garden-of-Eden configurations and restrictions, mutually erasable configurations, and injective parallel transformations are considered for the tessellation structure which is a model of a uniformly interconnected array of identical finite-state machines.
TL;DR: In this paper, the authors proposed a theoretical model for absorption into a stagnant liquid including the heat of absorption, variable density, an interfacial velocity, and an arbitrary equilibrium condition at the interface is able to predict experimental data over a wide range of conditions.
Abstract: The transformation of the energy equation from the mass average to the volume average reference frame exposes a pseudo Dufour effect. The theoretical model for absorption into a stagnant liquid including this effect, the heat of absorption, variable density, an interfacial velocity, and an arbitrary equilibrium condition at the interface is able to predict experimental data over a wide range of conditions. The data consisted of liquid temperature profiles and mass transfer rates into a stagnant liquid. The ammonia-water system exhibited interfacial temperature rises from 6.9°K to 18.2°K. The interfacial temperature rise for the propane-decane system was 1.3°K. Simpler theoretical models were able to predict the mass transfer rates or the temperature profiles.
TL;DR: In this paper, the same principle reaction was used for the total synthesis of (±) 2 - (p - chlorophenyl) - 3 - oxa - A - nor - estra - 1,5(10), 9(11) - triene - 17 - acetate 12a.
TL;DR: A differential equation describing the motion of a population of chemotactic bacteria in an exponential gradient of attractant has been solved analytically and specific predictions are made of the behavior of the bacterial distribution as a function of space and time.
TL;DR: In this paper, the authors studied the thermal autoxidation of isotactic poly(1-pentene) in the bulk phase using infra-red spectroscopy and showed that the reaction temperature varied from 100° to 115° and oxygen concentrations from 10% to 100% by volume.
TL;DR: In this paper, the kinetics of acid hydrolysis of Streptococcus salivarius levan were studied by examining the weight-average molecular weight of levan.
Abstract: The kinetics of the acid hydrolysis of Streptococcus salivarius levan were studied by examining the weight-average molecular weight. The molecular weights were obtained in a continuous manner from light scattering. Two first order reactions were observed: an initial rapid reaction in competition with a slower reaction.
Activation energies, activation entropies, as well as the rate dependence upon substrate and hydrogen ion concentrations were determined. The data seem to indicate that the fast reaction is related to the breaking of branch-point bonds while the slower reaction is related to the breaking of main-chain bonds. Thus, levan hydrolysis seems to be fundamentally different from the completely random degradation of other branched polysaccharides, i.e., dextran, glycogen, and amylopectin.
TL;DR: In this article, two techiques which have been developed to study lateral self-transport in thin thin films are described and compared; both are non-destructive and involve the determination of the spatial distribution of suitable radioactive tracers incorporated within the films.
TL;DR: In this paper, Salivarius was grown under constant pH at pH values 7.0, 6.3, 5.7 and 5.1, with sucrose present.
TL;DR: The idea of using colliding beams for fusion is nearly as old as is the interest in fusion as a source of power, but the problems of low reaction rate and high coulomb scattering initially seemed insurmountable.
Abstract: nuclei in the Intersecting Storage Rings at CERN. It may be for this reason that the idea of using colliding beam technology as a means of achieving fusion has not reappeared until just recently. The idea of using colliding beams for fusion is nearly as old as is the interest in fusion as a source of power, but the problems of low reaction rate and high coulomb scattering initially seemed insurmountable. This work describes recent work done at Fusion Energy Corporation which attempts to overcome these problems. Before turning to our own work, let us examine the well know facts about CERN ISR in a manner suggesting comparision with traditional plasma thermonuclear machines. The confinement time of the ISR is 235 days, that is, a beam stored in the morning has decreased by less than a percent in intensity by evening. The parameter, n7, density times confinement time can easily be found to be about 10" cmm3 set compared with present plasma values of no better than lO'","Lawson Criterion" (see below) values of 10'4, and values of 10" required when the Lawson Criterion is corrected by a nlnnber of realistic considerations (see below). Another parameter of interest to plasma researchers is !i, = Sn nkT/??, which is the ratio of kinetic energy density to magnetic energy density. In magnetically confined plasmas, this ratio must be less than 1. At ISR the ratio
TL;DR: In this article, the authors derived closed-form expressions for the transport coefficients of a one-component, relativistic gas with respect to the linearization of the Boltzmann equation for both quantum and classical gases.
Abstract: Variational expressions for the transport coefficients of a one-component, relativistic gas are derived from the linearized relativistic Boltzmann equation for both quantum and classical gases. These expressions depend on functions χ of the energy of the particles comprising the gas in such a way that: a) if χ differs from a solution of the linearized Boltzmann equation by e, then the value of the variational expression calculated with this χ differs from the true value of the corresponding transport coefficient by e2; and b) the value of the variational expression is always less than this true value. It is shown that values of the transport coefficients obtained by expanding χ in a particular set of orthogonal polynomials and keeping only the first nontrivial term in the expansion are equivalent to those obtained using the Grad method of moments. It follows therefore that values obtained using this later method represent lower bounds on the true values. We also show that one can obtain simple, closed-form expressions for the various transport coefficients corresponding to an arbitrary number of terms in an expansion of the trial function χ in the above-mentioned set of orthogonal polynomials. Finally we point out that all of our results can be carried over to the nonrelativistic case by taking the limit c → ∞.
TL;DR: In proposing a reasonable three-dimensional model, this work has carefully examined the experimental results of previous physical and chemical studies on heparin, which were recently reviewed.
Abstract: Heparin is best known for its blood anticoagulant activity, and considerable effort has been devoted to determining the structural features responsible for this activity. It has been widely accepted that the anticoagulant activity is related to the degree of sulfation and the molecular conformation (3, 6). The importance of the carboxyl group has recently been suggested by Stivala and Liberti (13). Little is known about what aspects of the three-dimensional structure of heparin that render it a highly active anticoagulant. We would like to present our preliminary thoughts on this subject, which are based on constructed molecular models and other data. In proposing a reasonable three-dimensional model, we have carefully examined the experimental results of previous physical and chemical studies on heparin, which were recently reviewed (4).
TL;DR: In this paper, the second layer of a monolayer plus helium film is assumed to form a quasi-two-dimensional gas and the binding energy of the second-layer atoms to the first layer is analyzed.
Abstract: A model in which the atoms in the second layer of a monolayer-plus helium film are assumed to form a quasi-two-dimensional gas is used to analyze the isotherm data of Goellner, Daunt, and Lerner for helium on Grafoil. The parameters in the model are determined by a least-squares fit of the model isotherm to the data. These parameters include the second and third virial coefficients of the quasi-two-dimensional gas and the binding energy of the second-layer atoms to the first layer. The empirical values are compared to recent theoretical predictions for the two-dimensional helium gas. The agreement and discrepancies between theoretical and empirical values are discussed. The conclusion is that the second layer (at low densities) can be described as an imperfect two-dimensional gas with perhaps some modification of the interatomic potential due to substrate effects.
TL;DR: In this paper, the functional groups present in poly(4-methyl-1-pentene) powders were identified using infrared spectroscopy, and the volatile products that formed were identified by means of a relativly new technique which combines gas chromatography and mass-spectroscopy.
Abstract: Isotactic and atactic poly(4-methyl-1-pentene) powders were degraded in the presence of pure oxygen at temperatures of 145° and 175°C. The functional groups present in the nonvolatile products were identified using infrared spectroscopy. The volatile products that formed were identified by means of a relativly new technique which combines gas chromatography and mass spectroscopy. In this study, seventeen volatile products were detected and identified and their relative abundance estimated. The results obtained could readily be reproduced. Various oxidation mechanisms for these products are postulated.
TL;DR: In this article, it was shown that the slope of the Coulomb gauge at the origin is negative and that the Yang-Mills propagator is perturbation-free.
Abstract: We show that the slope of $beta$ (g) at the origin is negative in the Coulomb gauge and agrees with the result obtained in covariant gauges. We also make a detailed comparison between the results obtained from the Bjorken-Johnson- Low limit and perturbation theory for the Yang-Mills propagator.
TL;DR: In this article, the authors analyzed the BNL 31 inch hydrogen bubble chamber to a separated antiproton beam and found no significant evidence that any of these resonance channels contributes to the broad bump in the total cross section.
TL;DR: In this paper, a study of multiplicity distributions obtained from anti pn interactions based on three bubble chamber experiments carried out at Argonne, CERN, and Brookhaven is presented.
Abstract: We present a study of multiplicity distributions obtained from anti pn interactions based on three bubble chamber experiments carried out at Argonne (5.55 GeV/c), CERN (9.3 GeV/c), and Brookhaven (14.6 GeV/c). Only events having a visible track stopping in the chamber were used for the present analysis; this allowed us to extract easily the coherent reactions from our data. The topological cross sections as well as various statistical moments obtained from the charged multiplicities are studied as functions of the incident momentum. Some comparison between our results and anti pn and pp data is made. (AIP)