			Home About us Contact

Analytical Modeling (analytical + modeling)

Distribution by Scientific Domains

Engineering	50%

Selected Abstracts

Analytical modeling of tensile strength of particulate-filled composites

POLYMER COMPOSITES, Issue 5 2001
Guoqiang Li
Based on Christen sen and Lo's (11) three-layer sphere model, a two-layer built-in model is proposed to represent particulate-filled composites. Following Papanico-laou and Bakos' (14) procedure for a particle embedded in an infinite matrix model and using the rule-of-mixtures approach, formulations estimating the tensile strength of particulate-filled composites are developed. Unlike Fapanicolaou and Bakos' formulations, the formulations developed in the present paper can characterize the effect of particle size, particle size distribution, and particle clustering on the tensile strength of the composites. A reasonable agreement is found between the predicted tensile strength and the experimental results found in the literature. Parameters affecting the tensile strength of particulate-filled composites are discussed via the calculated results. [source]

Lateral load distributions on grouped piles from dynamic pile-to-pile interaction factors

INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, Issue 2 2009
Der-Wen Chang
Abstract The load distributions of the grouped piles under lateral loads acting from one side of the pile cap could be approximately modeled using the elasticity equations with the assumptions that the underground structure is rigid enough to sustain the loads, and only small deformations of the soils are yielded. Variations of the soil,pile interactions along the depths are therefore negligible for simplicity. This paper presents the analytical modeling using the dynamic pile-to-pile interaction factors for 2,×,2 and 2,×,3 grouped piles. The results were found comparative with the experimental and numerical results of other studies. Similar to others' findings, it was shown that the leading pile could carry more static loads than the trailing pile does. For the piles in the perpendicular direction with the static load, the loads would distribute symmetrically with the centerline whereas the middle pile always sustains the smallest load. For steady-state loads with operating frequencies up to 30 Hz, the pile load distributions would vary significantly with the frequencies. It is interesting to know that designing the pile foundation needs to be cautioned for steady-state vibrations as they are a problem of machine foundation. However, for transient loads or any harmonic loads acting upon relatively higher frequencies, the pile loads could be regarded as uniformly distributed. It is hoped that the numerical results of this paper will be helpful in the design practice of pile foundation. Copyright © 2008 John Wiley & Sons, Ltd. [source]

A PROCESS ANALYSIS OF GLOBAL TRADE MANAGEMENT: AN INDUCTIVE APPROACH,

JOURNAL OF SUPPLY CHAIN MANAGEMENT, Issue 2 2010
WARREN H. HAUSMAN
This paper describes a new, detailed process model for Global Trade Management (GTM) that contains sufficient detail on cross-border trade processes to estimate the benefits of Information Technology-Enabled Global Trade Management (IT-GTM). Our methodology combines a grounded theory approach with data analysis and analytical modeling. GTM describes the processes required to support cross-border transactions between importers, exporters, their trading partners and governments. IT-GTM is the set of information technologies and software solutions that can be used by companies to carry out their global trading processes in a streamlined manner. We collect data on time reductions for individual trade process steps using IT-GTM and use Critical Path Analysis to calculate the resulting improvements in key metrics such as the Manufacture to Invoice Cycle and Days Sales Outstanding for exporters, and the Order to Receipt Cycle for importers. Under reasonably conservative scenarios the gross savings from IT-GTM amount to 1.7 percent and 0.6 percent of annual sales for exporters and importers, respectively. [source]

Implementation of high quality-factor on-chip tuned microwave resonators at 7 GHz

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2009
Rohat Melik
Abstract We report on the design, analytical modeling, numerical simulation, fabrication, and experimental characterization of chip-scale microwave resonators that exhibit high quality-factors (Q-factors) in the microwave frequency range. We demonstrate high Q-factors by tuning these microwave resonators with the film capacitance of their LC tank circuits rather than the conventional approach of using external capacitors for tuning. Our chip-scale resonator design further minimizes energy losses and reduces the effect of skin depth leading to high Q-factors even for significantly reduced device areas. Using our new design methodology, we observe that despite the higher resonance frequency and smaller chip size, the Q-factor is improved compared with the previous literature using traditional approaches. For our 540 ,m × 540 ,m resonator chip, we theoretically compute a Q-factor of 52.40 at the calculated resonance frequency of 6.70 GHz and experimentally demonstrate a Q-factor of 47.10 at the measured resonance frequency of 6.97 GHz. We thus achieve optimal design for microwave resonators with the highest Q-factor in the smallest space for operation at 6.97 GHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 497,501, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24103 [source]