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2006

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Articles 10021 - 10050 of 11376

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Assessment Of Long-Range Correlation In Time Series: How To Avoid Pitfalls, J. B. Gao, J. Hu, W. W. Tung, Y. H. Cao, N. Sarshar, V. P. Roychowdhury Jan 2006

Assessment Of Long-Range Correlation In Time Series: How To Avoid Pitfalls, J. B. Gao, J. Hu, W. W. Tung, Y. H. Cao, N. Sarshar, V. P. Roychowdhury

Department of Physics and Astronomy Faculty Publications

Due to the ubiquity of time series with long-range correlation in many areas of science and engineering, analysis and modeling of such data is an important problem. While the field seems to be mature, three major issues have not been satisfactorily resolved. (i) Many methods have been proposed to assess long-range correlation in time series. Under what circumstances do they yield consistent results? (ii) The mathematical theory of long-range correlation concerns the behavior of the correlation of the time series for very large times. A measured time series is finite, however. How can we relate the fractal scaling break at …

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Ultrasensitive Mass Sensing Using Mode Localization In Coupled Microcantilevers, M. Spletzer, A. Raman, A. Q. Wu, X. F. Xu, R. Reifenberger Jan 2006

Ultrasensitive Mass Sensing Using Mode Localization In Coupled Microcantilevers, M. Spletzer, A. Raman, A. Q. Wu, X. F. Xu, R. Reifenberger

Department of Physics and Astronomy Faculty Publications

We use Anderson or vibration localization in coupled microcantilevers as an extremely sensitive method to detect the added mass of a target analyte. We focus on the resonance frequencies and eigenstates of two nearly identical coupled gold-foil microcantilevers. Theoretical and experimental results indicate that the relative changes in the eigenstates due to the added mass can be orders of magnitude greater than the relative changes in resonance frequencies. Moreover this sensing paradigm possesses intrinsic common mode rejection characteristics thus providing an alternate way to achieve ultrasensitive mass detection under ambient conditions. (c) 2006 American Institute of Physics.

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Distinguishing Chaos From Noise By Scale-Dependent Lyapunov Exponent, J. B. Gao, J. Hu, W. W. Tung, Y. H. Cao Jan 2006

Distinguishing Chaos From Noise By Scale-Dependent Lyapunov Exponent, J. B. Gao, J. Hu, W. W. Tung, Y. H. Cao

Department of Physics and Astronomy Faculty Publications

Time series from complex systems with interacting nonlinear and stochastic subsystems and hierarchical regulations are often multiscaled. In devising measures characterizing such complex time series, it is most desirable to incorporate explicitly the concept of scale in the measures. While excellent scale-dependent measures such as epsilon entropy and the finite size Lyapunov exponent (FSLE) have been proposed, simple algorithms have not been developed to reliably compute them from short noisy time series. To promote widespread application of these concepts, we propose an efficient algorithm to compute a variant of the FSLE, the scale-dependent Lyapunov exponent (SDLE). We show that with …

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Efficient Algorithm For Random-Bond Ising Models In 2d, Y. L. Loh, E. W. Carlson Jan 2006

Efficient Algorithm For Random-Bond Ising Models In 2d, Y. L. Loh, E. W. Carlson

Department of Physics and Astronomy Faculty Publications

We present an efficient algorithm for calculating the properties of Ising models in two dimensions, directly in the spin basis, without the need for mapping to fermion or dimer models. The algorithm computes the partition function and correlation functions at a single temperature on any planar network of N Ising spins in O(N-3/2) time or less. The method can handle continuous or discrete bond disorder and is especially efficient in the case of bond or site dilution, where it executes in O(NlnN) time near the percolation threshold. We demonstrate its feasibility on the ferromagnetic Ising model and the +/- J …

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Rigorous Approach To The Comparison Between Experiment And Theory In Casimir Force Measurements, L. Klimchitskaya, F. Chen, R. S. Decca, E. Fischbach, D. E. Krause, D. Lopez, U. Mohideen, V. M. Mostepanenko Jan 2006

Rigorous Approach To The Comparison Between Experiment And Theory In Casimir Force Measurements, L. Klimchitskaya, F. Chen, R. S. Decca, E. Fischbach, D. E. Krause, D. Lopez, U. Mohideen, V. M. Mostepanenko

Department of Physics and Astronomy Faculty Publications

In most experiments on the Casimir force the comparison between measurement data and theory was done using the concept of the root-mean-square deviation, a procedure that has been criticized in the literature. Here we propose a special statistical analysis which should be performed separately for the experimental data and for the results of the theoretical computations. In so doing, the random, systematic and total experimental errors are found as functions of separation, taking into account the distribution laws for each error at 95% confidence. Independently, all theoretical errors are combined to obtain the total theoretical error at the same confidence. …

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Ultrasensitive Mass Sensing Using Mode Localization In Coupled Microcantilevers, M. Spletzer, A. Raman, A. Q. Wu, X. F. Xu, R. Reifenberger Jan 2006

Ultrasensitive Mass Sensing Using Mode Localization In Coupled Microcantilevers, M. Spletzer, A. Raman, A. Q. Wu, X. F. Xu, R. Reifenberger

Department of Physics and Astronomy Faculty Publications

We use Anderson or vibration localization in coupled microcantilevers as an extremely sensitive method to detect the added mass of a target analyte. We focus on the resonance frequencies and eigenstates of two nearly identical coupled gold-foil microcantilevers. Theoretical and experimental results indicate that the relative changes in the eigenstates due to the added mass can be orders of magnitude greater than the relative changes in resonance frequencies. Moreover this sensing paradigm possesses intrinsic common mode rejection characteristics thus providing an alternate way to achieve ultrasensitive mass detection under ambient conditions. (c) 2006 American Institute of Physics.

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Uncertainty And Sensitivity Analysis Of Gas Pulsations In The Suction Manifold Of A Multi-Cylinder Automotive Compressor, Nasir Bilal, Douglas Adams, Jeongil Park Jan 2006

Uncertainty And Sensitivity Analysis Of Gas Pulsations In The Suction Manifold Of A Multi-Cylinder Automotive Compressor, Nasir Bilal, Douglas Adams, Jeongil Park

International Compressor Engineering Conference

No abstract provided.

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Investigation Of Suction Process Of Scroll Compressors, Michael M. Cui, Jack Sauls Jan 2006

Investigation Of Suction Process Of Scroll Compressors, Michael M. Cui, Jack Sauls

International Compressor Engineering Conference

No abstract provided.

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Fault Diagnosis Of Reciprocating Compressor Using Pressure Pulsations, Smita S. Manepatil, Ashesh Tiwari Jan 2006

Fault Diagnosis Of Reciprocating Compressor Using Pressure Pulsations, Smita S. Manepatil, Ashesh Tiwari

International Compressor Engineering Conference

No abstract provided.

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Direct Simulation Of Transport In Open-Cell Metal Foams, S. Krishnan, J. Y. Murthy, S V. Garimella Jan 2006

Direct Simulation Of Transport In Open-Cell Metal Foams, S. Krishnan, J. Y. Murthy, S V. Garimella

CTRC Research Publications

Flows in porous media may be modeled using two major classes of approaches: (a) a macroscopic approach, where volume-averaged semiempirical equations are used to describe flow characteristics, and (b) a microscopic approach, where small-scale flow details are simulated by considering the specific geometry of the porous medium. In the first approach, small-scale details are ignored and the information so lost is represented in the governing equations using an engineering model. In the second, the intricate geometry of the porous structures is accounted for and the transport through these structures computed. The latter approach is computationally expensive if the entire physical …

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Design Of Near-Optimal Waveforms For Chest And Abdominal Compression And Decompression In Cpr Using Computer-Simulated Evolution, Charles F. Babbs Jan 2006

Design Of Near-Optimal Waveforms For Chest And Abdominal Compression And Decompression In Cpr Using Computer-Simulated Evolution, Charles F. Babbs

Weldon School of Biomedical Engineering Faculty Publications

Objective: To discover design principles underlying the optimal waveforms for external chest and abdominal compression and decompression during cardiac arrest and CPR. Method: A 14-compartment mathematical model of the human cardiopulmonary system is used to test successive generations of randomly mutated external compression waveforms during cardiac arrest and resuscitation. Mutated waveforms that produced superior mean perfusion pressure became parents for the next generation. Selection was based upon either systemic perfusion pressure (SPP=thoracic aortic minus right atrial pressure) or upon coronary perfusion pressure (CPP=thoracic aortic pressure minus myocardial wall pressure). After simulations of 64,414 individual CPR episodes, 40 highly evolved waveforms …

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A New Biomechanical Head Injury Criterion, Charles F. Babbs Jan 2006

A New Biomechanical Head Injury Criterion, Charles F. Babbs

Weldon School of Biomedical Engineering Faculty Publications

This paper presents a new analysis of the physics of closed head injury caused by intense acceleration of the head. At rest a 1 cm gap filled with cerebrospinal fluid (CSF) separates the human brain from the skull. During impact whole head acceleration induces artificial gravity within the skull. Because its density differs slightly from that of CSF, the brain accelerates, strikes the inner aspect of the rigid skull, and undergoes viscoelastic deformation. Analytical methods for a lumped parameter model of the brain predict internal brain motions that correlate well with published high-speed photographic studies. The same methods predict a …

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Experimental And Numerical Investigation Of Melting In A Cylinder, B Jones, D Sun, S Krishnan, S V. Garimella Jan 2006

Experimental And Numerical Investigation Of Melting In A Cylinder, B Jones, D Sun, S Krishnan, S V. Garimella

CTRC Research Publications

Well-controlled and well-characterized experimental measurements are obtained during the melting of a moderate-Prandtl-number material (n-eicosane) in a cylindrical enclosure heated from the side. The study aims to provide benchmark experimental measurements for validation of numerical codes. Experimental results in terms of measured temperatures and melt front locations are reported in both graphical and tabular forms. The melt front was captured photographically and its location ascertained using digital image processing techniques. To facilitate numerical validation exercises, a complete set of experimental results have been made available on a website for public access. An illustrative numerical comparison exercise was also undertaken using …

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Measurement Of Gas Pulsation In The Discharge Line Of A Compressor For Hvac: Method To Calculate The Progressive Acoustic Wave From The Compressor And Reflected Wave From The Installation, Pierre Poysat, Olivier Liegeois Jan 2006

Measurement Of Gas Pulsation In The Discharge Line Of A Compressor For Hvac: Method To Calculate The Progressive Acoustic Wave From The Compressor And Reflected Wave From The Installation, Pierre Poysat, Olivier Liegeois

International Compressor Engineering Conference

No abstract provided.

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The Use Of Cad/Cae Tools In Compressor Development Focusing Structural Analysis, Rinaldo Puff, Marcos Dropa Del Bortoli, Raul Bosco, Eduardo L. Gaertner Jan 2006

The Use Of Cad/Cae Tools In Compressor Development Focusing Structural Analysis, Rinaldo Puff, Marcos Dropa Del Bortoli, Raul Bosco, Eduardo L. Gaertner

International Compressor Engineering Conference

No abstract provided.

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Novel Geometrical Model Of Scroll Compressors For The Analytical Description Of The Chamber Volumes, Benjamin Blunier, Giansalvo Cirrincione, Abdellatif Miraoui Jan 2006

Novel Geometrical Model Of Scroll Compressors For The Analytical Description Of The Chamber Volumes, Benjamin Blunier, Giansalvo Cirrincione, Abdellatif Miraoui

International Compressor Engineering Conference

No abstract provided.

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Investigation On The Pressure Pulsation In The Discharge Muffler Of Rotary Compressors, Yikai Yuan, Jianhua Wu, Jingtao Yang, Qiang Gao Jan 2006

Investigation On The Pressure Pulsation In The Discharge Muffler Of Rotary Compressors, Yikai Yuan, Jianhua Wu, Jingtao Yang, Qiang Gao

International Compressor Engineering Conference

No abstract provided.

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The Theory Of A Scroll Profile, Hubert Bukac Jan 2006

The Theory Of A Scroll Profile, Hubert Bukac

International Compressor Engineering Conference

No abstract provided.

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Acoustics Of Suction Mufflers With Multiple Chambers, Christian Svendsen Jan 2006

Acoustics Of Suction Mufflers With Multiple Chambers, Christian Svendsen

International Compressor Engineering Conference

No abstract provided.

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Production Test Of Rotary Compressors Using Wavelet Analysis, Haishui Jin, Hongqiang Xiao, Haoyong Fa Jan 2006

Production Test Of Rotary Compressors Using Wavelet Analysis, Haishui Jin, Hongqiang Xiao, Haoyong Fa

International Compressor Engineering Conference

No abstract provided.

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A Theoretical Model And Experimental Validation Of A Sliding Vane Rotary Compressor, Roberto Cipollone, Giulio Contaldi, Antonio Sciarretta, Raffaele Tufano, Carlo Villante Jan 2006

A Theoretical Model And Experimental Validation Of A Sliding Vane Rotary Compressor, Roberto Cipollone, Giulio Contaldi, Antonio Sciarretta, Raffaele Tufano, Carlo Villante

International Compressor Engineering Conference

No abstract provided.

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Motion Analysis Of Compact Rotating Cylinder Compressor, Nelik Dreiman, Rick Bunch Jan 2006

Motion Analysis Of Compact Rotating Cylinder Compressor, Nelik Dreiman, Rick Bunch

International Compressor Engineering Conference

No abstract provided.

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Theoretical Analysis Of A Novel Rotary Compressor, Miguel E. Jovane, James E. Braun, Eckhard A. Groll, Seungun Lee Jan 2006

Theoretical Analysis Of A Novel Rotary Compressor, Miguel E. Jovane, James E. Braun, Eckhard A. Groll, Seungun Lee

International Compressor Engineering Conference

No abstract provided.

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Development And Performance Analysis Of A Two Cylinder Rolling Piston Expander For Transcritical Co2 System, Jan Yang, Li Zhang, Yumei J. Shi Jan 2006

Development And Performance Analysis Of A Two Cylinder Rolling Piston Expander For Transcritical Co2 System, Jan Yang, Li Zhang, Yumei J. Shi

International Compressor Engineering Conference

No abstract provided.

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Scroll Plate Optimization Based On Ga-Pso, Bin Peng, Jun Wang, Zhenquan Liu Jan 2006

Scroll Plate Optimization Based On Ga-Pso, Bin Peng, Jun Wang, Zhenquan Liu

International Compressor Engineering Conference

No abstract provided.

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Numerical Simulation On Scroll Expander-Compressor Unit For Co2 Trans-Critical Cycles, Hyunjin Kim, Jongmin Ahn, Sungouk Cho, Kyungrae Cho Jan 2006

Numerical Simulation On Scroll Expander-Compressor Unit For Co2 Trans-Critical Cycles, Hyunjin Kim, Jongmin Ahn, Sungouk Cho, Kyungrae Cho

International Compressor Engineering Conference

No abstract provided.

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Optimal Performance Design Method Of Thrust Slide-Bearing In Scroll Compressors For Maximum Efficiency, Tatsuya Oku, Keiko Anami, Noriaki Ishii, Kiyoshi Sawai, Charles W. Knisely, Takashi Morimoto, Akira Hiwata Jan 2006

Optimal Performance Design Method Of Thrust Slide-Bearing In Scroll Compressors For Maximum Efficiency, Tatsuya Oku, Keiko Anami, Noriaki Ishii, Kiyoshi Sawai, Charles W. Knisely, Takashi Morimoto, Akira Hiwata

International Compressor Engineering Conference

No abstract provided.

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Geometrical Optimisation Of The Revolving Compressor, Kim Tiow Ooi, Y. L. Teh Jan 2006

Geometrical Optimisation Of The Revolving Compressor, Kim Tiow Ooi, Y. L. Teh

International Compressor Engineering Conference

No abstract provided.

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Bowtie Compressor With Novel Capacity Modulation Part 1: Design Description And Model Development, Junhyeung Kim, Eckhard A. Groll Jan 2006

Bowtie Compressor With Novel Capacity Modulation Part 1: Design Description And Model Development, Junhyeung Kim, Eckhard A. Groll

International Compressor Engineering Conference

No abstract provided.

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A Simplified Numerical Methodology For The In-Cylinder Flow At The Top-Center Crank Position, F. A. Ribas, Cesar J. Deschamps Jan 2006

A Simplified Numerical Methodology For The In-Cylinder Flow At The Top-Center Crank Position, F. A. Ribas, Cesar J. Deschamps

International Compressor Engineering Conference

No abstract provided.

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