ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Electronic Resource

Tensiometer for free standing smectic films (1996)

Eberhardt, Matthias ; Meyer, Robert B.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 67 (1996), S. 2846-2851

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: We present the design of a machine which allows us to measure the surface tension of a free standing smectic film with an accuracy of 0.1 mN/m absolute and 0.01 mN/m relative. Our design makes it possible to measure the surface tension over a wide range of temperatures with minimal drift in the detector itself. The response time of our detector can be as small as 0.01 s which allows us to study dynamic processes involving the interaction between the film and the meniscus around the frame that supports the film. Our design is based on a rigid frame with a movable side suspended as a pendulum. The surface tension force on the movable side is opposed by a feedback system to stabilize the position of the movable side. The stabilizing force then is a measure of the surface tension. An optical system detects deflection of the movable side due to the surface tension force, and applies a restoring force by generating electric current in a coil which applies force to a permanent magnet attached to the pendulum arm. The feedback control includes an integrator stage to achieve finite force with negligible error in position. The device can be calibrated with a simple lever and weight scheme to simulate a surface tension force. The design elements that determine the stability and accuracy of the system are discussed. © 1996 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1147116

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2

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Spectral analysis and earthquake scaling of the Petatlan earthquake (M s =7.6) aftershocks, recorded at stations along the pacific coast and between the coast and Mexico City (1996)

Valdés-González, Carlos ; Meyer, Robert P.

Springer

Pure and applied geophysics 147 (1996), S. 631-656

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ISSN: 1420-9136

Keywords: Aftershocks ; seismic moment ; stress drop and source radius

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract Spectral parameters have been estimated for 214 Petatlan aftershocks recorded at stations between Petatlan and Mexico City and between Petatlan and Acapulco. The spectral parameters were used to obtain empirical relations for the estimation of seismic moment from coda length and fromM L . Stress drops, using Brune's model, were calculated for these aftershocks. Six events with large stress drop are located within a previously suggested asperity, and seven more suggest a boundary zone at the intersection of the Petatlan and Zihuatanejo aftershock rupture volumes. Stress drops increase with increasing seismic moment up to 1020 dyne-cm but appear to be constant at greater moment values. The peak horizontal velocity times distance of aftershocks recorded near the coast and between the coast and Mexico City (30 to 270 km away), scales linearly with seismic moment, and predicts well the peak horizontal values of large (M s ≥7.0) coastal thrust events recorded on rock sites at Mexico City. Peak horizontal velocity is a straightforward measurement, thus this relation allows us to evaluate expected ground motion between the Pacific coast and Mexico City from the seismic moment of subduction related earthquakes along the coast.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01089695

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3

Electronic Resource

Combining Sources of Preference Data for Modeling Complex Decision Processes (1999)

Louviere, Jordan J. ; Meyer, Robert J. ; Bunch, David S. ; [et al.]

Springer

Marketing letters 10 (1999), S. 205-217

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ISSN: 1573-059X

Keywords: Choice modeling ; started preference data ; data pooling ; context effects ; choice dynamics

Source: Springer Online Journal Archives 1860-2000

Topics: Economics

Notes: Abstract We review current state-of-the-art practices for combining preference data from multiple sources and discuss future research possibilities. A central theme is that any one data source (e.g., a scanner panel source) is often insufficient to support tests of complex theories of choice and decision making. Hence, analysts may need to embrace a wider variety of data types and measurement tools than traditionally have been considered in applied decision making and choice research. We discuss the viability of preference-stationarity assumptions usually made when pooling data, as well as random-utility theory-based approaches for combining data sources. We also discuss types of models and data sources likely to be required to make inferences about and estimate models that describe choice dynamics. The latter discussion is speculative insofar as the body of literature on this topic is small.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1008050215270

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4

Electronic Resource

The Effect of Set Composition on Stopping Behavior in a Finite Search Among Assortments (1997)

MEYER, ROBERT J.

Springer

Marketing letters 8 (1997), S. 131-143

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ISSN: 1573-059X

Keywords: Search Theory ; Context Effects ; Sequential Decision Making

Source: Springer Online Journal Archives 1860-2000

Topics: Economics

Notes: Abstract The process by which individuals make sequential searches among choice sets prior to choosing a single item is examined. Economic search theory prescribes that such searches should be made by focusing on expectations of the maximum utility likely to be found in each set, ignoring external features of sets such as their complexity. Empirical research in psychology, however, suggests that search behavior may be highly influenced by set features, most notably a tendency to defer choices from sets that are perceived as difficult to evaluate. An experimental investigation of choice-set search reveals that stopping decisions are indeed influenced by normatively irrelevant external features of sets, but not in a way that is completely consistent with previous work on context effects. In particular, we find that individuals are likely to stop sooner in search when encountering larger versus smaller choice sets (holding their maximum utilities constant), and decisions to stop are unaffected by two traditional measures of difficulty: whether a choice set lacks dominant options and the similarity of overall utilities of options in a set. Implications of the work for the ability to generalize findings in static choice to dynamic task settings are explored.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1007949730445

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5

Electronic Resource

Dynamic Influences on Individual Choice Behavior (1997)

Meyer, Robert ; Erdem, Tulin ; Feinberg, Fred ; [et al.]

Springer

Marketing letters 8 (1997), S. 349-360

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ISSN: 1573-059X

Keywords: choice models ; dynamic decision making ; learning ; strategic decision making

Source: Springer Online Journal Archives 1860-2000

Topics: Economics

Notes: Abstract Research examining the process of individual decision making over time isbriefly reviewed. We focus on two major areas of work in choice dynamics:research that has examined how current choices are influenced by the historyof previous choices, and newer work examining how choices may be made toexploit expectations about options available in the future. A central themeof the survey is that if a general understanding of choice dynamics is toemerge, it will come through the development of boundedly-rational models ofdynamic problem solving that lie on the interface between economics andpsychology.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1007968706676

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6

Electronic Resource

Optimal equi-partition of rectangular domains for parallel computation (1996)

Christou, Ioannis T. ; Meyer, Robert R.

Springer

Journal of global optimization 8 (1996), S. 15-34

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ISSN: 1573-2916

Keywords: Graph partitioning ; parallel computation ; genetic algorithms

Source: Springer Online Journal Archives 1860-2000

Topics: Mathematics

Notes: Abstract We present an efficient method for the partitioning of rectangular domains into equi-area sub-domains of minimum total perimeter. For a variety of applications in parallel computation, this corresponds to a load-balanced distribution of tasks that minimize interprocessor communication. Our method is based on utilizing, to the maximum extent possible, a set of optimal shapes for sub-domains. We prove that for a large class of these problems, we can construct solutions whose relative distance from a computable lower bound converges to zero as the problem size tends to infinity. PERIX-GA, a genetic algorithm employing this approach, has successfully solved to optimality million-variable instances of the perimeter-minimization problem and for a one-billion-variable problem has generated a solution within 0.32% of the lower bound. We report on the results of an implementation on a CM-5 supercomputer and make comparisons with other existing codes.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00229299

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7

Electronic Resource

A Partitioned ∈-Relaxation Algorithm for Separable Convex Network Flow Problems (1999)

De Leone, Renato ; Meyer, Robert R. ; Zakarian, Armand

Springer

Computational optimization and applications 12 (1999), S. 107-126

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ISSN: 1573-2894

Keywords: network flows ; relaxation methods ; asynchronous

Source: Springer Online Journal Archives 1860-2000

Topics: Computer Science

Notes: Abstract A relaxation method for separable convex network flow problems is developed that is well-suited for problems with large variations in the magnitude of the nonlinear cost terms. The arcs are partitioned into two sets, one of which contains only arcs corresponding to strictly convex costs. The algorithm adjusts flows on the other arcs whenever possible, and terminates with primal-dual pairs that satisfy complementary slackness on the strictly convex arc set and ∈-complementary slackness on the remaining arcs. An asynchronous parallel variant of the method is also developed. Computational results demonstrate that the method is significantly more efficient on ill-conditioned networks than existing methods, solving problems with several thousand nonlinear arcs in one second or less.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1008667714641

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