Showing papers by "Stevens Institute of Technology published in 1982"
TL;DR: Only performance-contingent reward behavior was found to affect subordinate performance significantly and positive relationships were found between leader contingent reward behavior and employee satisfaction.
Abstract: This study investigated the nature of the relationships between leader reward and punishment behaviors and subordinate performance and satisfaction. Only performance-contingent reward behavior was found to affect subordinate performance significantly. Positive relationships were found between leader contingent reward behavior and employee satisfaction. Contingent punishment had no effects on subordinate performance or satisfaction.
352 citations
TL;DR: In this paper, the key set of typical rows (or typical columns) used to reproduce a data matrix, are obtained by finding the set of rows or set of columns most orthogonal to each other.
173 citations
TL;DR: A performance index is developed which is minimized by the RHFC (inverse optimal control problem), and similar controllers for which the horizon distance is an easily computed explicit function of the state are developed.
145 citations
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TL;DR: Information Systems Working Papers Series is a series of papers by scientists and engineers looking at the challenges and opportunities in the rapidly changing environment and some of the approaches to solving these problems.
Abstract: Information Systems Working Papers Series
104 citations
TL;DR: In this article, the origin of turbulent secondary flow in pipes of noncircular cross section is examined from a theoretical standpoint, and it is proven mathematically that secondary flows result from a nonzero difference in the normal Reynolds stresses on planes perpendicular to the axial flow direction.
90 citations
TL;DR: In this paper, a numerical study of the laminar flow of an incompressible viscous fluid in rotating ducts of rectangular cross-section is conducted, where the full time-dependent nonlinear equations of motion are solved by finite-difference techniques for moderate to relatively rapid rotation rates where both the convective and viscous terms play an important role.
Abstract: A numerical study of the laminar flow of an incompressible viscous fluid in rotating ducts of rectangular cross-section is conducted. The full time-dependent nonlinear equations of motion are solved by finite-difference techniques for moderate to relatively rapid rotation rates where both the convective and viscous terms play an important role. At weak to moderate rotation rates, a double-vortex secondary flow appears in the transverse planes of the duct whose structure is relatively independent of the aspect ratio of the duct. For Rossby numbers Ro c 100 this secondary flow is shown to lead to substantial distortions of the axial velocity profiles. For more rapid rotations (Ro c l), the Secondary flow (in a duct with an aspect ratio of two) is shown to split into an asymmetric configuration of four counter-rotating vortices similar to that which appears in curved ducts. It is demonstrated mathematically that this effect could result from a disparity in the symmetry of the convective and Coriolis terms in the equations of motion. If the rotation rates are increased further, the secondary flow restabilizes to a slightly asymmetric double-vortex configuration and the axial velocity wumes a Taylor-Proudman configuration in the interior of the duct. Comparisons with existing experimental results are quite favourable.
89 citations
57 citations
47 citations
TL;DR: In this paper, a new diagrammatic representation for Hamiltonian systems with three phase space dimensions is presented, which allows an easy way to find KAM boundaries and island in the Poincare mapping and lead thereby to a complete description of the geography of the mapping.
38 citations
TL;DR: The robust nonlinear-correlator (NC) detector is obtained based on detector efficacy as performance criterion and the robust M -detector structure for constant-signal detection is also explicitly obtained.
Abstract: The detection of signals in noise with possibly asymmetric probability density functions is considered. The noise density model allows a symmetric contaminated-nominal central part and an arbitrary tail behavior. For detection of known signals, the robust nonlinear-correlator (NC) detector is obtained based on detector efficacy as performance criterion. The robust M -detector structure for constant-signal detection is also explicitly obtained.
34 citations
TL;DR: In this article, the authors studied the divergent integrals that occur in all post-Newtonian (PN) treatments of radiation reaction in slow-motion, gravitationally bound systems in general relativity.
Abstract: We study the divergent integrals that occur in all post-Newtonian (PN) treatments of radiation reaction in slow-motion, gravitationally bound systems in general relativity. The PN methods implicitly assume that the near-zone metric has a valid asymptotic expansion in powers of the small velocity parameter $\ensuremath{\epsilon}$. We first show explicitly (for the gauge to be used here) that a PN-approximation method leads to a divergent integral at 4-PN order. This divergence arises from the second iteration. Matching arguments are then used to calculate a near-zone term of $O(\mathrm{ln}\ensuremath{\epsilon})$ larger than 4-PN order. On the basis of this calculation and several previous model problems, we argue that the PN divergences signify the breakdown of the PN power-series assumptions, rather than a breakdown of the near and wave zones. Our results suggest that the PN calculations in fact give correct answers at least up to the orders at which divergences appear. The nonanalytic term of $O(\mathrm{ln}\ensuremath{\epsilon})$ beyond 4-PN order arises in the near zone via matching to the wave-zone expansion when we include terms of $O({\ensuremath{\epsilon}}^{3})$ beyond linearized order. We also solve the wave-zone equations at $O({\ensuremath{\epsilon}}^{6})$ beyond linearized order and analyze the inner expansion of the solutions. Matching gives rise to a nonanalytic term in the wave zone at $O({\ensuremath{\epsilon}}^{11}\mathrm{ln}\ensuremath{\epsilon})$, i.e., at $O({\ensuremath{\epsilon}}^{6}\mathrm{ln}\ensuremath{\epsilon})$ beyond linearized order. A straining technique is used in the wave-zone expansion to give a sufficiently accurate approximation to the null surfaces near past and future null infinity. The lowest-order strained solution at first appears to contribute a large, anomalous, time-odd piece to the reaction potential. However, after analyzing the contribution of higher-order wave-zone terms, we obtain agreement with the Burke reaction potential. Our results thus strongly support the usual quadrupole formula.
TL;DR: In this paper, a solution of the Navier-Stokes equations for an incompressible stagnation point flow whose magnitude oscillates in time about a constant, non-zero, value (an unsteady Hiemenz flow) is given.
Abstract: A solution of the Navier-Stokes equations is given for an incompressible stagnation point flow whose magnitude oscillates in time about a constant, non-zero, value (an unsteady Hiemenz flow). Analytic approximations to the solution in the low and high frequency limits are given and compared with the results of numerical integrations. The application of these results to one aspect of the boundary layer receptivity problem is also discussed.
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TL;DR: In this article, the authors present the rationale for and design of a field evaluation of natural language for data retrieval, and the natural language system and application are described along with the research design of the project.
Abstract: One strategy that has been proposed for dealing with thegrowing backlog for development of applications is to givecasual users languages for interacting directly with databases.Yet, there is little agreement on the form suchlanguages should take. Should they be natural-like, conformingclosely to a user's native tongue or should they bestructured to take advantage of the characteristics offormal languages?This paper presents the rationale for and design of afield evaluation of natural language for data retrieval.The natural language system and application are describedalong with the research design of the project. The resultsof the first part of the study, a laboratory experimentto investigate whether users perform better with an artificial or natural language, suggest that after equalamounts of training no difference in subject performanceis found between languages using a paper and pencil test .The insights gained to date are summarized.
TL;DR: In this paper, a single-screw extruder with extruder RPM and polymer flow-rate was used for DV at atmospheric pressure under nitrogen and also at reduced pressure, and preliminary results were applied to current mathematical models.
Abstract: Polymer melt devolatilization (DV) was studied using a single-screw extruder with extruder RPM and polymer flow-rate as the key parameters varied. DV efficiency was studied at atmospheric pressure under nitrogen and also at reduced pressure. Preliminary results are applied to current mathematical models.
TL;DR: In this paper, the authors investigated the formation of negative hydrogen ions by backscattering thermal hydrogen atoms incident on a thick cesium surface, and they obtained a survival probability of 0.005 for hydrogen from a 2500-K oven.
Abstract: We have investigated the formation of negative hydrogen ions by backscattering thermal hydrogen atoms incident on a thick cesium surface. The incident hydrogen atoms are produced by thermal dissociation of molecular hydrogen at temperatures of about 2500 K. The negative ions are produced with an efficiency of ${10}^{\ensuremath{-}4}$ ions per incident atom. Our data show that the backscattering theory of Hiskes-Gardner-Karo, originally developed for incident hydrogen atoms with energies above 100 eV, can be extrapolated down to the 1-eV range. One way of comparing our experimental results with the above theory is to determine the average survival probability for the negative hydrogen ions as they leave the cesium surface. We obtain a survival probability of 0.005 for hydrogen from a 2500-K oven, in close agreement with the value of 0.004 calculated by extrapolating the experimental results of Hiskes and Schneider down to 1 eV. In addition to the negative hydrogen ions we see electrons produced with efficiencies about one hundred times greater than for the negative ions. The electrons appear to be produced by an Auger process accompanying a chemical reaction of hydrogen with cesium.
TL;DR: In this article, the authors investigated the production of negative hydrogen ions by bombarding hydrogen adsorbed onto a cesiated molybdenum surface with positive cesium ions.
Abstract: We have investigated the production of negative hydrogen ions by bombarding hydrogen adsorbed onto a cesiated molybdenum surface with positive cesium ions The negative hydrogen yields are measured as a function of hydrogen gas pressure, cesium coverage, and energy of the incident cesium ions The optimum yield obtained was 04 for 750-eV cesium ions bombarding hydrogen adsorbed onto the molybdenum surface covered with 065 monolayers of cesium It is observed that the sticking coefficient of hydrogen decreases as the cesium coverage increases We measure the energy distribution of the negative hydrogen ions as they leave the surface The energy spread is about 05% of the incident cesium-ion energy We compare our results for the production probability of negative hydrogen ions with the results obtained by Hiskes and Schneider
TL;DR: A detailed model for the interdiffusion and reaction process in Cu Sn thin films is presented in this paper, where linear growth kinetics for the η′ compound at 86°C implying that interfacial reaction kinetics is the rate-controlling step.
TL;DR: In this article, the authors describe a beam line at the ACO storage ring for solid state photoelectron spectorscopy incorporating a 1 m focal length toroidal grating monochromator for the photon energy range 6 eV to 120 eV custom-built by Jobin-Yvon Instruments S.A.
TL;DR: Assuming that there is one processor at each vertex and all of these processors are synchronized, the authors can have a distributed algorithm for finding all the shortest paths in time O( d · p2) where d is the maximum of the degrees of Vertices and p is the number of vertices.
Abstract: Assuming that there is one processor at each vertex and all of these processors are synchronized, we can have a distributed algorithm for finding all the shortest paths in time O( d · p2) where d is the maximum of the degrees of vertices and p is the number of vertices.
TL;DR: In this article, a fraction of low molecular weight from a partially acid-hydrolyzed S. salivarius levan was examined in aqueous solution at 25° by the method of small-angle X-ray scattering (SAXS).
TL;DR: In this paper, a fractionated sample of S. salivarius levan was examined in aqueous solution at 25° by the method of small-angle X-ray scattering.
Brown University1, University of Cambridge2, Illinois Institute of Technology3, Indiana University4, Johns Hopkins University5, Massachusetts Institute of Technology6, Radboud University Nijmegen7, Oak Ridge National Laboratory8, Rutgers University9, Stevens Institute of Technology10, Technion – Israel Institute of Technology11, Tel Aviv University12, University of Tennessee13, Weizmann Institute of Science14, Yale University15
TL;DR: In this paper, a probabilistic method to search for jets was proposed and the jets found by this method are seen to be similar to high-p====== T T − annihilations andvp interactions.
Abstract: The gross features of the data are reviewed and the momentum tensor components, 〈S〉, and 〈T〉 are studied. Evidence for coplanarity effects is observed. A probabilistic method to search for jets is proposed. The jets found by this method are seen to be similar to highp
T
jets frompp interactionse
+
e
− annihilations andvp interactions. The effect of subtracting the leading particles and the effect of lowp
T
diffractive and non diffractive components are investigated.
TL;DR: This work demonstrates that chemical ionization-mass spectrometic techniques can be a labor-saving alternative to other methods of structure determination and that 3α,7α,12α,25-tetrahydroxy-5β-cholestan-24-one is probably an intermediate in the 25-hydroxylation pathway of cholic acid from cholesterol.
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TL;DR: Information Systems Working Papers Series is a series of papers by scientists and engineers looking at ways to improve the quality of research and development in the information systems industry.
Abstract: Information Systems Working Papers Series
TL;DR: In this paper, small angle X-ray scattering of the model polystyrenes from methyl ethyl ketone (MEK) solutions at 25°C was examined and it was shown that the mass per unit length and cross-sectional radius of gyration increase with increasing branch length.
TL;DR: In this article, it was shown that when slow-motion infinities arise in an assumed power-series expansion of a time-varying scalar field, they signal the occurrence of terms of logarithmic order in the slow motion expansion parameter.
Abstract: We demonstrate that when slow-motion infinities arise in an assumed power-series expansion of a time-varying scalar field, they signal the occurrence of terms of logarithmic order in the slow-motion expansion parameter. Previous approximation techniques used in general relativity have assumed that all quantities could be expanded in powers of the small parameter(s). This paper provides the first example, within general relativity, of perturbative effects whose order of magnitude is not a power, but a nonanalytic function of a small parameter. Several previous slow-motion derivations of gravitational radiation damping contained divergent integrals. We first show how an inappropriate expansion method produces divergent integrals in scalar perturbations on a Schwarzschild background. We then use matched asymptotic expansions to discover the aforementioned logarithmic terms. We employ the method of strained coordinates to seek a wave-zone expansion that is uniformly valid at very large distances. We also find that an unexpectedly large, time-odd term in the near zone, which arises via matching to the lowest wave-zone order, is canceled when higher wave-zone orders are considered. No divergent integrals occur. These same techniques will be used in a future paper on the much more complicated gravitational problem.
TL;DR: Sharp lower bounds for the point connectivity and line connectivity of the line graph L(G) and the total graph T(T) of a graph G are determined and it is shown that 2λ is an upper bound for k(T(G)) and that λ(T (G))= 2δ = δ( T(G).
Abstract: Sharp lower bounds for the point connectivity and line connectivity of the line graph L(G) and the total graph T(G) of a graph G are determined. The lower bounds are expressed in terms of the point connectivity k, line connectivity λ, and minimum degree δ of G. It is also shown that 2λ is an upper bound for k(T(G)) and that λ(T(G))= 2δ = δ(T(G)). In each case the realizable values beyond the lower bound are determined.