Showing papers by "Stevens Institute of Technology published in 1984"
TL;DR: A new result is presented which answers the previously unsolved question of characterizing the connection sequence of circulants having point connectivity equal to point degree and develops some theorems regarding a new generalization of connectivity known as super-connectivity.
Abstract: There is diverse literature on various properties of a class of graphs known as circulants. We present a new result which answers the previously unsolved question of characterizing the connection sequence of circulants having point connectivity equal to point degree. We also develop some theorems regarding a new generalization of connectivity known as super-connectivity. In addition, we give a survey of published results pertinent to the study of connectivity of circulants.
345 citations
TL;DR: In this article, a new technique for solvent extraction with immobilized interfaces in a hydrophobic microporous membrane is described, where no dispersion or coalescence is necessary.
267 citations
TL;DR: In this paper, a sample of male professional accountants at different career stages were compared with respect to their work needs, work attitudes (intrinsic and extrinsic satisfaction, organizational and professional commitment), and vocational preferences.
74 citations
Patent•
28 Aug 1984TL;DR: An immobilized interface solute-transfer unit for transferring solute from a feed solution to an extractant liquid comprises a fluidtight housing and a porous membrane which divides the housing into a feed-solution chamber and an extract-anthesis chamber.
Abstract: An immobilized-interface solute-transfer unit for transferring solute from a feed solution to an extractant liquid comprises a fluid-tight housing and a porous membrane which divides the housing into a feed solution chamber and an extractant chamber. The housing has feed solution inlet and outlet ports which communicate with the feed solution chamber, and extractant inlet an outlet ports which communicate with the extractant chamber. The solute-transfer unit also includes a pressure difference controller for maintaining a difference between a liquid pressure of a feed solution in the feed solution chamber and a liquid pressure of an extractant in the extractant chamber substantially within a predetermined pressure range so that an interface between the feed solution and the extractant is substantially immobilized at the membrane. The solute-transfer unit is particularly adapted for transferring a solute from a feed solution to an extractant, which feed solution and extractant are immiscible with one another when in direct contact.
55 citations
TL;DR: In this paper, the potential energy curves for electronic states of Hg2 and TlHg were derived using large scale configuration interaction procedures for the valence electrons, with the core electrons represented by ab initio relativistic effective potentials.
Abstract: Potential energy curves for electronic states of Hg2 and TlHg are presented and analyzed. They are derived using large scale configuration interaction procedures for the valence electrons, with the core electrons represented by ab initio relativistic effective potentials. The effect of spin‐orbit coupling are investigated for the low‐lying excimer states. It is determined that neither system possesses strongly bound electronic states for which transitions to the repulsive ground states are optically allowed.
36 citations
TL;DR: A numerical analysis of an asymmetric permeator containing two different kinds of membranes and capable of separating a ternary feed gas mixture into three product streams has been carried out as discussed by the authors, where the main parameters used in the analysis are pressure ratios, the ratio of the two membrane areas and the permeabilities.
28 citations
09 Jul 1984
TL;DR: This work investigates the extension of the coset enumeration method to other finitely generated groups and finds that rational subsets of finitely generate free groups can be solved efficiently using this technique.
Abstract: Various problems involving rational subsets of finitely generated free groups can be solved efficiently using a technique related to coset enumeration. We investigate the extension of this method to other finitely generated groups.
28 citations
TL;DR: In this article, a series solution technique is introduced to express each product composition as a power series in terms of a dimensionless membrane area, which is used to compute product compositions and fractions of the feed mixture permeating the membranes.
Abstract: The difficulties in the numerical solution of differential equations for countercurrent binary gas permeators are discussed. For a permeator with countercurrent or cocurrent flow of a binary gas mixture without axial pressure drops, a series solution technique is introduced to express each product composition as a power series in terms of a dimensionless membrane area. For countercurrent flow over a wide range of parameters, compute product compositions and fractions of the feed mixture permeating the membranes compare very well with those from a numerical solution of the governing equations for small to moderate permeate fractions in the range considered practical. For ideal separation factors of 2, 5, 10, 25, and 80, significant deviations occur at fractions larger than 0.7, 0.5, 0.33, 0.25, and 0.15, respectively, at a pressure ratio of around 0.1 and a more-permeable-component feed mole fraction around 0.2. Cocurrent flow predictions are excellent at somewhat lower permeate fractions. Preliminary countercurrent permeator design or rating problems will require solution of only one o two cubic equations.
25 citations
TL;DR: In this article, the constitutive equations for a multiphase mixture of fluids are presented, where the mixture is assumed to consist of a single non-uniform temperature and no phase change is allowed.
24 citations
TL;DR: Azetidine-2,3-diones can be conveniently synthesized by mild hydrolysis of the product of the reaction between α-phenylthio-β-lactams and sulfuryl chloride.
23 citations
TL;DR: In this paper, a computer program based on a non-computer procedure reported in the literature for the determination of mechanism and corresponding activation energy utilizing non-isothermal TG data is presented, which is then applied to six sets of TG data.
01 Dec 1984-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this article, a successful test of holography in the Big European Bubble Chamber (BEBC) at CERN was reported. But this test was carried out with a modified in-line scheme and the smallest bubbles had a diameter of ≳ 120 μm.
Abstract: We report on a successful test of holography in the Big European Bubble Chamber (BEBC) at CERN, which was filled with a heavy neon—hydrogen mixture. During the test of a modified in-line scheme we photographed bubble tracks longer than 1 m, which were produced by cosmic rays. The smallest bubbles, which were recorded with excellent contrast, had a diameter of ≳ 120 μm. This presents an improved resolution of a factor of five compared to photos taken with conventional cameras.
Posted Content•
TL;DR: An abstraction ~echanism will be introduced that allows the system to guide the user in a stepwise refinement process from the selection of an application and a decision model, to the choice of a subgroup ( category) of alternatives to be considered, and finally to the extraction of decision-relevant data from an underlying database, followed by the execution of the model.
Abstract: ion mechanisms have been widely proposed for data modelling since the original papers by Smith and Smith [ 19771. In this paper, an abstraction ~echanism will be introduced that allows the system to guide the user in a stepwise refinement process from the selection of an application and a decision model, to the choice of a subgroup (category) of alternatives to be considered, to the choice of evaluation criteria for that category, and finally to the extraction of decision-relevant data from an underlying database, followed by the execution of the model. This process is implemented as a sequence of menus. However, in contrast to typical menus, their format is not rigid, but depends on data retrieved from the database at various abstraction levels. In this section, the abstraction hierarchy and its representation in a slightly extended relational model will be presented. In Section 5, its use for data-driven user interface generation will be demonstrated . 4.1 Abstraction Hierarchy For Model Selection And Data Extraction Figure 2 depicts the abstraction hierarchy that plays a central role in the CMCDSS. For simplicity, we assume that the MCDM method requires as input a set of alternatives each characterized by a number of properties or attributes. For example, in a car-buying example the alternatives are types of cars and the base relation would contain relevant attributes such as "maximum speed", Itfuel consumptionw etc. Some (but not necessarily all) of these attributes may be important to Center for Digital Economy Research Stem School of Business IVorking Paper IS-84-72
TL;DR: The Universal Imaging Algebra is introduced as a many sorted algebra that involves numerous new and conventional operators useful in image analysis and recognition.
TL;DR: In this article, the authors compared different judgmental methods of setting passing scores by estimating item difficulties for the minimally competent examinee, and found that the variance of the variance was higher for the indirect method compared with the direct method.
Abstract: Several studies have compared different judgmental methods of setting passing scores by estimating item difficulties for the minimally competent examinee. Usually, a direct method of estimating item difficulties has been compared with an indirect method suggested by Nedelsky (1954). Nedelsky's method has usually resulted in a substantially lower cutoff score than that arrived at with a direct method. Two studies were car ried out for the purpose of comparing a direct method of setting passing scores with an indirect method that allowed judges to estimate the probability of the mini mally competent examinee eliminating each incorrect alternative. In Study 1 a sample of 52 first-level su pervisors used both methods to estimate passing scores on a content-oriented selection test for building main tenance specialists. In Study 2 a sample of 62 first- level supervisors used both methods to estimate pass ing scores on an entry level auto mechanics test. Re sults of both studies showed that the variance compo ne...
TL;DR: This paper argued that for community psychology, which perceives theory, application, and action as valid aspects of its broad paradigm, it would be most adaptive to explicitly address the challenge of managing a balance between diversity and cohesion.
Abstract: Differences between academic and nonacademic psychologists may be viewed as immutable, worthy of encouragement, or as a situation which the latter group must remedy by becoming “more scientific.” We contend that for community psychology, which perceives theory, application, and action as valid aspects of its broad paradigm, it would be most adaptive toexplicitly address the challenge of managing a balance between diversity and cohesion. There are signs that the present leadership of Division 27 recognizes aspects of this problem and is reconsidering the role and purpose of the Division as an organizing framework for the discipline (Trickett, Note 3). It is our view that engendering a commitment from various subgroups within the membership to addressing the disparities revealed by our respondents is required for resolving what we see as major obstacles to future development of the discipline. The conceptual and empirical approach presented in this study can be an important tool in forging constructive solutions to the challenges we have presented.
TL;DR: This paper addresses the application of parameter sensitivity analysis to large flexible space structure models with uncertain parameters such as modal dampings, modal frequencies, and mode shape slopes at actuator (sensor) locations with results indicating that critical parameters are critical in that order.
Abstract: This paper addresses the application of parameter sensitivity analysis to large flexible space structure models with uncertain parameters such as modal dampings, modal frequencies, and mode shape slopes at actuator (sensor) locations/A parameter ranking criterion is given to delineate the critical parameters in linear regulator problems. The quantitative measure is labeled ''Parameter Error Index." Explicit and simple analytical formulas are obtained in terms of the modal data for the vibration suppression problem of large space structures. The proposed procedure is applied to the "Purdue Model," a generic two-dimensional large space structure model. Results indicate that, for the specific model used for the uncertainty of the parameters, modal dampings, modal frequencies, and mode shape slopes are critical in that order (in a broad sense). This type of information is useful in parameter estimation, robust control design, structure redesign, etc.
TL;DR: The author describes how educators are integrating powerful personal computers and networks into a new learning environment with emphasis on engineering education, computer networks, and the progress made by various institutions in implementing a computer-intensive environment.
Abstract: The author describes how educators are integrating powerful personal computers and networks into a new learning environment. He discusses the educational uses of computers, with emphasis on engineering education, computer networks, the impact of computers on the institution, and the progress made by various institutions in implementing a computer-intensive environment.
TL;DR: The method of calculating radiation damping effects by means of energy balance is applied to a simple model problem in this paper, where the balance equation is derived from the conservation law for energy that is a consequence of the equations of motion for the system by integrating over a fourdimensional space-time region bounded in the wave zone by two future-directed null cones and in the near zone by twot=const surfaces.
Abstract: The method of calculating radiation damping effects by means of energy balance is applied to a simple model problem The balance equation is derived from the conservation law for energy that is a consequence of the equations of motion for the system by integrating over a four-dimensional space-time region bounded in the wave zone by two future-directed null cones and in the near zone by twot=const surfaces It is assumed that the sources are in slow motion and the fields are calculated by the method of matched asymptotic expansions Our principle conclusion is that even though the damping isO(e3) wheree is an expansion parameter the fields need only be determined toO(1) to calculate the effects of damping by this method
TL;DR: It is proved that f(r) ∼ 5r2 and exact values for f( r) are provided for odd integers of the form r = 4n − 1.
TL;DR: The role of normal stresses in the generation of non-Newtonian secondary flows in straight tubes of noncircular cross-section was examined from a theoretical standpoint in this article, where it was proven independent of any constitutive assumptions that in order for these secondary flows to occur in the absence of body forces, the axial velocity must give rise to some nonzero difference in the transverse normal stresses.
Abstract: The role that the normal stresses play in the generation of non-Newtonian secondary flows in straight tubes of non-circular cross-section, is examined from a theoretical standpoint. It is proven independent of any constitutive assumptions that in order for these secondary flows to occur in the absence of body forces, the axial velocity must give rise to some non-zero difference in the transverse normal stresses. This necessary condition is utilized to demonstrate that the development of secondary flows in certain non-Newtonian fluids can be influenced by the precise structure of the time derivatives in the constitutive equations. In particular, it is shown that certain frame-indifferent convected time rates give rise to secondary flows whereas others do not.
06 Jun 1984
TL;DR: In this paper, a robustness condition for linear Regulators in time domain is proposed and a design algorithm that incorporates both stability robustness and performance robustness into the design procedure is suggested.
Abstract: This paper addresses the aspect of Robustness of Linear Regulators in time domain. First a Stability Robustness condition in time domain (in terms of eigenvalues) is presented and it is shown that the proposed robustness condition is less conservative than i) the corresponding frequency domain condition and ii) another time domain condition recently proposed (in terms of singular values). Next a technique is presented to further reduce the conservatism of the proposed condition. Finally a design algorithm that incorporates both "Stability Robustness" and "Performance Robustness" into the design procedure is suggested and simple examples are presented to illustrate the proposed concepts.
TL;DR: In this paper, the longueur mouillee de la surface, which corresponded to the Longueur de l'aile, change au cours de loscillation.
Abstract: Analyse theorique de l'ecoulement autour de la surface portante rigide d'un hydroglisseur. Lorsqu'une telle surface oscille dans une eau qui serait calme autrement, les equations de l'ecoulement se reduisent a des equations aerodynamiques d'une aile oscillante en l'absence de pesanteur. Mais la longueur mouillee de la surface, qui correspond a la longueur de l'aile, change au cours de l'oscillation. On analyse l'effet de cette longueur variable dans le temps sur la masse additionnelle et sur le coefficient d'amortissement. Utilisation des potentiels des vitesses et des accelerations. Pour une frequence reduite tres faible, la variation de la longueur mouillee est le deplacement de l'intersection de la surface avec la surface de l'eau non perturbee
TL;DR: A simple mathematical model predicts the relationship between the division times of the asymmetric daughter cells and the doubling time of the cell population as a whole and the average protein and RNA content per cell can be obtained from a knowledge of the time-dependence of polymer biosynthesis during the cell cycle.
TL;DR: In this paper, a modification of two existing computer programs (a lateral pile program and a pile group program) is used to determine the amount of failure of bridge piers in the case of vessel impact.
TL;DR: The overall performance of the proposed stochastic approximation algorithm when using a dedicated microprocessor with fixed point arithmetic is superior to the extended least-squares method in terms of memory requirements, execution speed per iteration, and the estimation results.