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1

Electronic Resource

Food partitioning between coexisting Atlantic salmon and brook trout in the Sainte-Marguerite River ecosystem, Quebec (2004)

Mookerji, N. ; Weng, Z. ; Mazumder, A.

Oxford, UK; Malden, USA : Blackwell Science Ltd/Inc.

Journal of fish biology 64 (2004), S. 0

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ISSN: 1095-8649

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Food resource partitioning between similar-sized, sympatric Atlantic salmon Salmo salar and brook trout Salvelinus fontinalis was examined as a possible mechanism enabling their coexistence in a stream (Allaire) of the Sainte-Marguerite River ecosystem, Quebec, Canada. Fish stomach contents and invertebrate drift were collected concurrently during three diel cycles in August to September 1996. The food and feeding habits of an allopatric brook trout population in a nearby stream (Epinette) were studied for comparison. The diel feeding rhythms of the two coexisting fish species were similar. The composition of their diet, however, showed significant differences. Atlantic salmon predominantly (60–90%) fed on aquatic insects, mainly Ephemeroptera (35–60% of the diet). The brook trout mostly (50–80%) fed upon the allochthonous terrestrial insects (mainly adults of Coleoptera, Hymenoptera and Diptera) which comprised 5–40% of the stream drift. The allopatric brook trout fed opportunistically on the more abundant aquatic insects and terrestrial insects rarely formed 25% of its diet. The allopatric trout fed nearly twice as much as the sympatric brook trout during a day. The results suggest that the differences in feeding by brook trout in the two streams (with and without Atlantic salmon) are the result of inter-specific interaction with Atlantic salmon and are not related to the differences in food availability between the two streams. Food resource partitioning between Atlantic salmon and brook trout may be viewed as an adaptive response resulting in a greater exploitation of available resources and coexistence.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1095-8649.2004.00333.x

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2

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Analytic solution to the Eliashberg equation for the superconducting critical temperatures

Wu, H.-S. ; Weng, Z.-Y. ; Ji, G. ; [et al.]

Amsterdam : Elsevier

Journal of Physics and Chemistry of Solids 48 (1987), S. 395-417

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ISSN: 0022-3697

Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Topics: Chemistry and Pharmacology , Physics

Type of Medium: Electronic Resource

URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3697(87)90100-4

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3

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Integrating early sales with production decisions: analysis and insights (1999)

Weng, Z. Kevin ; Parlar, Mahmut

Springer

IIE transactions 31 (1999), S. 1051-1060

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ISSN: 1573-9724

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract Faster product development and increased competition in retail industries is resulting in shorter and shorter product life-cycles. This phenomenon is making it more difficult for a firm to accurately estimate random demand of such products and to plan their one-time order quantity accordingly. In this paper, we develop a model to assess the multiple effects of coordinated – i.e., joint – stocking and prior-sale discount decisions: (i) on the reduction of demand uncertainty; (ii) on maximization of the expected profit; and (iii) on the probability of achieving or exceeding it. We develop the joint optimal decisions that maximize the expected profit and discuss a procedure for computing the probability that the realized value of the (random) profit will exceed its maximum expected value. We present qualitative results on the varying effects of joint decisions on increasing the expected profit and the probability of achieving or exceeding it. We also describe a detailed numerical study examining the effects of varying parameter values on the percentage increase in expected profit with joint decision making. The paper concludes with extensions of the model that can deal with more general situations.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1007671407701

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4

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Strategies for integrating lead time and customer-order decisions (1999)

Weng, Z. KEVIN

Springer

IIE transactions 31 (1999), S. 161-171

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ISSN: 1573-9724

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract Make-to-order manufacturers are facing unprecedented challenges to fill their customer orders quickly and to reduce their operating costs. In this paper, we first describe and discuss order taking and lead time quoting practice in a real world make-to-order manufacturing system. We then develop a model for this practical problem to study the conflicting objectives of delivering customized orders quickly and maximizing expected profit. The primary goal of this paper is to develop a general model for studying the trade-offs and the interrelationships among the following manufacturing performance measures: manufacturing flow times, quoted lead time reliability (earliness and tardiness), throughput (or demand) rates, inventory levels, resource utilization, and expected profits. These and other related managerial issues are explored. Our structural results yield insights into basic choices between filling customer orders quickly and maximizing expected profit.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1007568619312

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5

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Spin-charge separation and cuprate superconductors (1995)

Weng, Z. Y. ; Sheng, D. N. ; Ting, C. S.

Springer

Journal of superconductivity 8 (1995), S. 549-550

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ISSN: 1572-9605

Keywords: spin-charge separation ; anomalous spin dynamics and transport

Source: Springer Online Journal Archives 1860-2000

Topics: Electrical Engineering, Measurement and Control Technology , Physics

Notes: Abstract We propose a spin-charge separation scheme based on thet-J model. Such a spin-charge separation state can reproduce various 1D correlations at strong-coupling fixed-point. At 2D half-filling, a long-range AF order is recovered, and a spin-charge deconfinement is found at finite doping in 2D. In this spin-charge separation regime, anomalous magnetic and transport properties are obtained. We find interesting similarities of these anomalies to those found in high-T c cuprates.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00727422

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6

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Measurement of the polarizabilities ofn 2 D Rydberg states of cesium (1995)

Lei, T. ; Gu, S. ; Weng, Z. ; [et al.]

Springer

The European physical journal 34 (1995), S. 139-141

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ISSN: 1434-6079

Keywords: 32.60+i ; 35.10.Di

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The tensor polarizabilities of thenD states of cesium withn=22−55 were determined by Doppler-free two-photon absorption spectroscopy. In general the results are in agreement with theoretical predictions. The large discrepancy between them forn〉45 is discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01437681

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7

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The power of coordinated decisions for short-life-cycle products in a manufacturing and distribution supply chain (1999)

Weng, Z. Kevin

Springer

IIE transactions 31 (1999), S. 1037-1049

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ISSN: 1573-9724

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract This paper explores ways of conceptualizing and studying the power of coordination and strategic alliances within a manufacturing and distribution supply chain consisting of one manufacturer and one distributor. The supply chain operates to meet price-sensitive random demand of a product with a short product life cycle. We derive closed-form multi-attribute measures of performance for the supply chain in the presence of and in the absence of coordination of pricing and production/ordering decisions. The optimal coordinated pricing and production/ordering policies, as well as each party's optimal policies in the absence of coordination, are developed. Our results yield insights into basic managerial issues for this type of manufacturing and distribution supply chains.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1007619423631

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8

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Pricing and ordering strategies in manufacturing and distribution alliances (1997)

WENG, Z. KEVIN

Springer

IIE transactions 29 (1997), S. 681-692

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ISSN: 1573-9724

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract This paper studies the effect of coordination in a manufacturing and distribution system consisting of one manufacturer and one distributor. The system operates to meet price-sensitive random demand with the objective of maximizing expected profits of both the manufacturer and the distributor. The coordinated pricing and production/ordering policies that maximize the expected profits of the manufacturer and the distributor, as well as the distributor's optimal pricing and ordering policies without coordination, are developed. The focus of this study is to address the following managerial questions: What factors make coordination an effective strategy for both the manufacturer and the distributor? What are the coordination strategies and the coordinated policies that maximize both parties' expected profits and the joint expected profit? These and other related managerial issues are explored in this paper.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1018574118920

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9

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Lanczos-type Methods for Continuation Problems (1997)

Chien, C.-S. ; Weng, Z.-L. ; Shen, C.-L.

New York, NY [u.a.] : Wiley-Blackwell

Numerical Linear Algebra with Applications 4 (1997), S. 23-41

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ISSN: 1070-5325

Keywords: Lanczos methods ; conjugate gradient methods ; continuation methods ; eigenvalue problems ; bifurcation ; Engineering ; Numerical Methods and Modeling

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics

Notes: We study the Lanczos type methods for continuation problems. First we indicate how the symmetric Lanczos method may be used to solve both positive definite and indefinite linear systems. Furthermore, it can be used to monitor the simple bifurcation points on the solution curve of the eigenvalue problems. This includes computing the minimum eigenvalue, the minimum singular value, and the condition number of the partial tridiagonalizations of the coefficient matrices. The Ritz vector thus obtained can be applied to compute the tangent vector at the bifurcation point for branch-switching. Next, we indicate that the block or band Lanczos method can be used to monitor the multiple bifurcations as well as to solve the multiple right hand sides. We also show that the unsymmetric Lanczos method can be exploited to compute the minimum eigenvalue of a nearly symmetric matrix, and therefore to detect the simple bifurcation point as well. Some preconditioning techniques are discussed. Sample numerical results are reported. Our test problems include second order semilinear elliptic eigenvalue problems. © 1997 by John Wiley & Sons, Ltd.

Additional Material: 10 Tab.

Type of Medium: Electronic Resource

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