Entire DC Network | Open Access Articles | Digital Commons Network™

Thermodynamic Simulation Of Ammonia-Water Double Effect Absorption Chiller, Nizar Ben Ezzine, Khalifa Mejbri, Messaoud Barhoumi, Ahmed Bellagi

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

An Adsorption Chiller Driven By Thermoelectricity, Hui Tong Chua, Anutosh Chakraborty, Xiao Lin Wang

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

Scroll Expander For Carbon Dioxide Air Conditioning Cycles, Detlef Westphalen, John Dieckmann

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

Numerical Study And Experimental Validation Of A Transcritical Carbon Dioxide Refrigerating Cycle, Joaquim Rigola, Sergio Morales, Gustavo Raush, Carlos C. Perez Segarra, Nicolas Ablanque

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

Experimental Study On Adiabatic Flow Of R-22 Alternatives In Capillary Tubes, Claudio Melo, Lluis Antonio Torquato Vieira, Roberto Horn Pereira

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

An Empirical Study Of Frost Accumulation Effects On Louvered-Fin, Microchannel Heat Exchangers, Yan Ping Xia, Predrag S. Hrnjak, Anthony M. Jacobi

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

A New Ericsson Cycle Comprising A Scroll Expander And A Scroll Compressor For Power And Refrigeration Applications, Young Min Kim, D. K. K. Shin, J. H. H. Lee

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

Damping Patch Placement On Outdoor Unit Of Air-Conditioner By Using Structural Intensity Technique, Kyu Sik Kim, Yeon June Kang, Sim Won Chin, In Hwa Jung, Jung Woo Lee

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

An Investigation Into The Feasibility Of The Use Of Water As A Refrigerant, Frandon F. Lachner, Gregory F. Nellis, Douglas T. Reindl

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

Air-Side Heat Transfer Augmentation Of A Refrigerator Evaporator Using Vortex Generation, Andrew Sommers, Anthony M. Jacobi

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

Ranking Of Working Fluids For Organic Rankine Cycle Applications, Lars J. Brasz, William M. Bilbow

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

Thermal Performance Of A Direct Expansion Solar Assisted Heat Pump, Vladimir Soldo, Tonko Curko, Igor Balen

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

Application Of Energy Efficient Scroll Compressor For Small Cars, Sangeet Hari Kapoor, Sachin Paramane, Gyan Arora

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

A New Control Strategy Of Indoor Air Temperature In An Air-Conditioning System, Cheng Zhi Lou, Guo Qing Cao, Da Wei An, Gang Lou

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

Performances Of A New Air-To-Water Heat Pump System With Controlled Capacity, Nicolas Flach Malaspina, Jean Marc Lebreton, Denis Clodic

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

Experimental Analysis Of An Automotive Air Conditioning System With Two-Phase Flow Measurements, Shu Jun Wang, Jun Jie Gu

International Refrigeration and Air Conditioning Conference

No abstract provided.

Go to article

Quantum Interference Effects In Particle Transport Through Square Lattices, E. Cuansing, H. Nakanishi

Department of Physics and Astronomy Faculty Publications

We study the transport of a quantum particle through square lattices of various sizes by employing the tight-binding Hamiltonian from quantum percolation. Input and output semi-infinite chains are attached to the lattice either by diagonal point-to-point contacts or by a busbar connection. We find resonant transmission and reflection occurring whenever the incident particle's energy is near an eigenvalue of the lattice alone (i.e., the lattice without the chains attached). We also find the transmission to be strongly dependent on the way the chains are attached to the lattice.

Go to article

Non-Bps Brane Dynamics And Duality, T. E. Clark, M. Nitta, T. Ter Veldhuis

Department of Physics and Astronomy Faculty Publications

The Green-Schwarz action for a non-BPS p=2 brane embedded in a N=1, D=4 target superspace is shown to be equivalent to the Nambu-Goto-Akulov-Volkov action obtained via the nonlinear realization of the associated target space super-Poincare symmetries. Introducing a U(1) gauge field strength as a Lagrange multiplier, this p=2 brane action is recast into its equivalent dual form non-BPS D2-brane Born-Infeld action. Following the procedure given by Sen, the Green-Schwarz action for a non-BPS D2-brane is determined directly. From it, conversely, the dual form non-BPS p=2 brane action is derived. The p=2 brane and the D2-brane actions obtained by these two …

Go to article

An Astronomical Search For Evidence Of New Physics: Limits On Gravity-Induced Birefringence From The Magnetic White Dwarf Re J0317-853, O. Preuss, M. P. Haugan, S. K. Solanki, S. Jordan

Department of Physics and Astronomy Faculty Publications

The coupling of the electromagnetic field directly with gravitational gauge fields leads to new physical effects that can be tested using astronomical data. Here we consider a particular case for closer scrutiny, a specific nonminimal coupling of torsion to electromagnetism, which enters into a metric-affine geometry of space-time. We show that under the assumption of this nonminimal coupling, space-time is birefringent in the presence of such a gravitational field. This leads to the depolarization of light emitted from extended astrophysical sources. We use polarimetric data of the magnetic white dwarf RE J0317-853 to set, for the very first time, constraints …

Go to article

Solar Constraints On New Couplings Between Electromagnetism And Gravity, S. K. Solanki, O. Preuss, M. P. Haugan, A. Gandorfer, H. P. Povel, P. Steiner, K. Stucki, P. N. Bernasconi, D. Soltau

Department of Physics and Astronomy Faculty Publications

The unification of quantum field theory and general relativity is a fundamental goal of modern physics. In many cases, theoretical efforts to achieve this goal introduce auxiliary gravitational fields, ones in addition to the familiar symmetric second-rank tensor potential of general relativity, and lead to nonmetric theories because of direct couplings between these auxiliary fields and matter. Here, we consider an example of a metric-affine gauge theory of gravity in which torsion couples nonminimally to the electromagnetic field. This coupling causes a phase difference to accumulate between different polarization states of light as they propagate through the metric-affine gravitational field. …

Go to article

Enhanced Mass Sensing Using Torsional And Lateral Resonances In Microcantilevers, L. B. Sharos, A. Raman, S. Crittenden, R. Reifenberger

Department of Physics and Astronomy Faculty Publications

We present a method to detect, with enhanced sensitivity, a target mass particle attached eccentrically to a microcantilever by measuring multiple three-dimensional modes in the microcantilever vibration spectrum. Peaks in the spectrum reveal a complex coupling between the bending, torsional, and lateral motions and detailed finite element models assist in their interpretation. The mass sensitivities of the torsional and lateral mode frequencies are an order of magnitude greater, and their Q factors significantly higher, than that of the conventionally used fundamental bending mode. These modes offer significantly enhanced mass sensing capabilities within the realm of existing microcantilever technology. (C) 2004 …

Go to article

Cessation Of X-Ray Pulsation Of Gx 1+4, W. Cui, B. Smith

Department of Physics and Astronomy Faculty Publications

We report results from our weekly monitoring campaign on the X-ray pulsar GX 1+4 with the Rossi X-Ray Timing Explorer satellite. The spin-down trend of GX 1+4 was continuing, with the pulsar being at its longest period ever measured (about 138.7 s). At the late stage of the campaign, the source entered an extended faint state, during which its X-ray (2-60 keV) flux decreased significantly, to an average level of similar to3 x 10(-10) ergs cm(-2) s(-1). It was highly variable in the faint state; the flux dropped to as low as similar to3 x 10(-11) ergs cm(-2) s(-1). in …

Go to article

Change In Speed And Direction Of The Jet Near The Core In The Quasar 3c 279, S. G. Jorstad, A. P. Marscher, M. L. Lister, A. M. Stirling, T. V. Cawthorne, J. L. Gomez, W. K. Gear

Department of Physics and Astronomy Faculty Publications

Intensive monitoring of the innermost jet in the quasar 3C 279 at 43 GHz from 1998 March to 2001 April with the Very Long Baseline Array, in combination with previous observations, reveal ( 1) an increase in apparent speed from 5c to 17c and (2) a change in projected direction of the jet by similar to20degrees. These effects could result from a small increase in the intrinsic viewing angle of the jet nozzle from Thetaless than or similar to0.degrees5 to Thetaless than or similar to1.degrees6, with no increase required in the actual speed of the flow, which corresponds to a …

Go to article

X-Ray Spectral Variability Of Extreme Bl Lacertae Active Galactic Nucleus H1426+428, A. D. Falcone, W. Cui, J. P. Finley

Department of Physics and Astronomy Faculty Publications

Between 2002 March 7 and 2002 June 15, intensive X-ray observations were carried out on the extreme BL Lac object H1426+428 with instruments on board the Rossi X-Ray Timing Explorer (RXTE). These instruments provide measurements of H1426+428 in the crucial energy range that characterizes the first peak of its spectral energy distribution. This peak, which is almost certainly due to synchrotron emission, has previously been inferred to be in excess of 100 keV. By taking frequent observations over a four-month campaign, which included similar to450 ks of RXTE time, studies of flux and spectral variability on multiple timescales were performed, …

Go to article

A Search For Tev Gamma-Ray Emission From High-Peaked Flat-Spectrum Radio Quasars Using The Whipple Air Cerenkov Telescope, A. D. Falcone, I. H. Bond, P. J. Boyle, S. M. Bradbury, J. H. Buckley, D. Carter-Lewis, O. Celik, W. Cui, M. Daniel, M. D'Vali, I. D. Perez, C. Duke, D. J. Fegan, S. J. Fegan, J. P. Finley, L. F. Fortson, J. Gaidos, S. Gammell, K. Gibbs, G. H. Gillanders, J. Grube, J. Hall, T. A. Hall, D. Hanna, A. M. Hillas, J. Holder, D. Horan, A. Jarvis, G. E. Kenny, M. Kertzman, D. Kieda, J. Kildea, J. Knapp, K. Kosack, H. Krawczynski, F. Krennrich, M. J. Lang, S. Lebohec, E. Linton, J. Lloyd-Evans, A. Milovanovic, P. Moriarty, D. Muller, T. Nagai, S. Nolan, R. Ong, R. Pallassini, D. Petry, F. Pizlo, B. Power-Mooney, J. Quinn, M. Quinn, K. Ragan, P. Rebillot, P. T. Reynolds, H. J. Rose, M. Schroedter, G. Sembroski, S. P. Swordy, A. Syson, K. Tyler, V. V. Vassiliev, S. P. Wakely, G. Walker, T. C. Weekes, J. Zweerink

Department of Physics and Astronomy Faculty Publications

Blazars have traditionally been separated into two broad categories based on their optical emission characteristics. Blazars with faint or no emission lines are referred to as BL Lacertae objects ( BL Lacs), and blazars with prominent, broad emission lines are commonly referred to as flat-spectrum radio quasars (FSRQs). The spectral energy distribution of FSRQs has generally been thought of as being more akin to the low-peaked BL Lacs, which exhibit a peak in the infrared region of the spectrum, as opposed to high-peaked BL Lacs (HBLs), which exhibit a peak in UV/X-ray region of the spectrum. All blazars that are …

Go to article

Constraints On The Very High Energy Emission From Bl Lacertae Objects, D. Horan, H. M. Badran, I. H. Bond, P. J. Boyle, S. M. Bradbury, J. H. Buckley, D. A. Carter-Lewis, M. Catanese, O. Celik, W. Cui, M. Daniel, M. D'Vali, I. D. C. Perez, C. Duke, A. Falcone, D. J. Fegan, S. J. Fegan, J. P. Finley, L. F. Fortson, J. A. Gaidos, S. Gammell, K. Gibbs, G. H. Gillanders, J. Grube, J. Hall, T. A. Hall, D. Hanna, A. M. Hillas, J. Holder, A. Jarvis, M. Jordan, G. E. Kenny, M. Kertzman, D. Kieda, J. Kildea, J. Knapp, K. Kosack, H. Krawczynski, F. Krennrich, M. J. Lang, S. Le Bohec, E. Linton, J. L. Evans, A. Milovanovic, P. Moriarty, D. Muller, T. Nagai, S. Nolan, R. A. Ong, R. Pallassini, D. Petry, B. Power-Mooney, J. Quinn, M. Quinn, K. Ragan, P. Rebillot, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, S. P. Swordy, A. Syson, V. V. Vassiliev, S. P. Wakely, G. Walker, T. C. Weekes, J. Zweerink

Department of Physics and Astronomy Faculty Publications

We present results from observations of 29 BL Lacertae objects, taken with the Whipple Observatory 10 m gamma-ray telescope between 1995 and 2000. The observed objects are mostly at low redshift (z<0.2), but observations of objects of up to z=0.444 are also reported. Five of the objects are EGRET sources and two are unconfirmed TeV sources. Three of the confirmed sources of extragalactic TeV gamma rays were originally observed as part of this survey and have been reported elsewhere. No significant excesses are detected from any of the other objects observed, on timescales of days, months, or years. We report 99.9% confidence level flux upper limits for the objects for each observing season. The flux upper limits are typically 20% of the Crab flux, although for some sources, limits as sensitive as 6% of the Crab flux were derived. The results are consistent with the synchrotron self-Compton model predictions considered in this work.

Go to article

X-Ray Flaring Activity Of Markarian 421, W. Cui

Department of Physics and Astronomy Faculty Publications

We report results from a systematic search for X-ray flares from Mrk 421, using archival data from the Rossi X-Ray Timing Explorer (RXTE) satellite. The flares are clearly seen over a wide range of timescales. The quasi-continuous coverage of the source with the All-SkyMonitor (ASM) reveals frequent occurrence of major flares that last for months. On a few occasions, the source was intensively monitored with the more sensitive pointing instruments aboard RXTE. The data from these observations show the presence of X-ray flares of much shorter duration, ranging from weeks down to less than an hour. For the first time, …

Go to article

Rfabsorption Involving Biological Macromolecules, E. W. Prohofsky

Department of Physics and Astronomy Faculty Publications

The fundamental intramolecular frequency of a globular protein can be obtained from the measurements of acoustic velocities of bulk protein matter. This lowest frequency for common size molecules is shown to be above several hundred GHz. All modes below this frequency would then be intermolecular modes or bulk modes of the molecule and surrounding matter or tissue. The lowest frequency modes of an extended DNA double helix are also shown to be bulk modes because of interaction with water. Only DNA modes, whose frequency is well above 4 GHz, can be intrahelical modes, that is, confined to the helix rather …

Go to article

Fourier-Domain Holography In Photorefractive Quantum-Well Films, K. Jeong, L. L. Peng, D. D. Nolte, M. R. Melloch

Department of Physics and Astronomy Faculty Publications

Fourier-domain holography (FDH) is investigated as a candidate for holographic optical coherence imaging to produce real-time images of structure inside living tissue and turbid media. The effects of spatial filtering, the background intensity distributions, and the role of background noise in determining dynamic range are evaluated for both FDH and image-domain holography (IDH). The grating washout effect in FDH (edge enhancement) is removed by use of a vibrating diffuser that consequently improves the image quality. By comparing holographic images and background images of FDH and IDH we show that FDH provides a higher dynamic range and a higher image quality …

Go to article

Tev Gamma-Ray Observations Of The Galactic Center, K. Kosack, H. M. Badran, I. H. Bond, P. J. Boyle, S. M. Bradbury, J. H. Buckley, D. A. Carter-Lewis, O. Celik, V. Connaughton, W. Cui, M. Daniel, M. D'Vall, I. D. L. Perez, C. Duke, A. Falcone, D. J. Fegan, S. J. Fegan, J. P. Finley, L. F. Fortson, J. A. Gaidos, S. Gammell, K. Gibbs, G. H. Gillanders, J. Grube, K. Gutierrez, J. Hall, T. A. Hall, D. Hanna, A. M. Hillas, J. Holder, D. Horan, A. Jarvis, M. Jordan, G. E. Kenny, M. Kertzman, D. Kieda, J. Kildea, J. Knapp, H. Krawczynski, F. Krennrich, M. J. Lang, S. Le Bohec, E. Linton, J. Lloyd-Evans, A. Milovanovic, J. Mcenery, R. Moriarty, D. Muller, T. Nagai, S. Nolan, R. A. Ong, R. Pallassini, D. Petry, B. Power-Mooney, J. Quinn, M. Quinn, K. Ragan, P. Rebillot, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, S. P. Swordy, A. Syson, V. V. Vassiliev, S. P. Wakely, G. Walker, T. C. Weekes, J. Zweerink

Department of Physics and Astronomy Faculty Publications

We report a possible detection of TeV gamma rays from the Galactic center by the Whipple 10 m gamma-ray telescope. Twenty-six hours of data were taken over an extended period from 1995 through 2003 resulting in a total significance of 3.7 sigma. The measured excess corresponds to an integral flux of 1.6 x 10(-8) +/- 0.5 x 10(-8) (stat) +/- 0.3 x 10(-8) (sys) photons m(-2) s(-1) above an energy of 2.8 TeV, roughly 40% of the flux from the Crab Nebula at this energy. The 95% confidence region has an angular extent of about 15' and includes the position …

Go to article

Full-Text Articles in Entire DC Network

Thermodynamic Simulation Of Ammonia-Water Double Effect Absorption Chiller, Nizar Ben Ezzine, Khalifa Mejbri, Messaoud Barhoumi, Ahmed Bellagi

International Refrigeration and Air Conditioning Conference

An Adsorption Chiller Driven By Thermoelectricity, Hui Tong Chua, Anutosh Chakraborty, Xiao Lin Wang

International Refrigeration and Air Conditioning Conference

Scroll Expander For Carbon Dioxide Air Conditioning Cycles, Detlef Westphalen, John Dieckmann

International Refrigeration and Air Conditioning Conference

Numerical Study And Experimental Validation Of A Transcritical Carbon Dioxide Refrigerating Cycle, Joaquim Rigola, Sergio Morales, Gustavo Raush, Carlos C. Perez Segarra, Nicolas Ablanque

International Refrigeration and Air Conditioning Conference

Experimental Study On Adiabatic Flow Of R-22 Alternatives In Capillary Tubes, Claudio Melo, Lluis Antonio Torquato Vieira, Roberto Horn Pereira

International Refrigeration and Air Conditioning Conference

An Empirical Study Of Frost Accumulation Effects On Louvered-Fin, Microchannel Heat Exchangers, Yan Ping Xia, Predrag S. Hrnjak, Anthony M. Jacobi

International Refrigeration and Air Conditioning Conference

A New Ericsson Cycle Comprising A Scroll Expander And A Scroll Compressor For Power And Refrigeration Applications, Young Min Kim, D. K. K. Shin, J. H. H. Lee

International Refrigeration and Air Conditioning Conference

Damping Patch Placement On Outdoor Unit Of Air-Conditioner By Using Structural Intensity Technique, Kyu Sik Kim, Yeon June Kang, Sim Won Chin, In Hwa Jung, Jung Woo Lee

International Refrigeration and Air Conditioning Conference

An Investigation Into The Feasibility Of The Use Of Water As A Refrigerant, Frandon F. Lachner, Gregory F. Nellis, Douglas T. Reindl

International Refrigeration and Air Conditioning Conference

Air-Side Heat Transfer Augmentation Of A Refrigerator Evaporator Using Vortex Generation, Andrew Sommers, Anthony M. Jacobi

International Refrigeration and Air Conditioning Conference

Ranking Of Working Fluids For Organic Rankine Cycle Applications, Lars J. Brasz, William M. Bilbow

International Refrigeration and Air Conditioning Conference

Thermal Performance Of A Direct Expansion Solar Assisted Heat Pump, Vladimir Soldo, Tonko Curko, Igor Balen

International Refrigeration and Air Conditioning Conference

Application Of Energy Efficient Scroll Compressor For Small Cars, Sangeet Hari Kapoor, Sachin Paramane, Gyan Arora

International Refrigeration and Air Conditioning Conference

A New Control Strategy Of Indoor Air Temperature In An Air-Conditioning System, Cheng Zhi Lou, Guo Qing Cao, Da Wei An, Gang Lou

International Refrigeration and Air Conditioning Conference

Performances Of A New Air-To-Water Heat Pump System With Controlled Capacity, Nicolas Flach Malaspina, Jean Marc Lebreton, Denis Clodic

International Refrigeration and Air Conditioning Conference

Experimental Analysis Of An Automotive Air Conditioning System With Two-Phase Flow Measurements, Shu Jun Wang, Jun Jie Gu

International Refrigeration and Air Conditioning Conference

Quantum Interference Effects In Particle Transport Through Square Lattices, E. Cuansing, H. Nakanishi

Department of Physics and Astronomy Faculty Publications

Non-Bps Brane Dynamics And Duality, T. E. Clark, M. Nitta, T. Ter Veldhuis

Department of Physics and Astronomy Faculty Publications

An Astronomical Search For Evidence Of New Physics: Limits On Gravity-Induced Birefringence From The Magnetic White Dwarf Re J0317-853, O. Preuss, M. P. Haugan, S. K. Solanki, S. Jordan

Department of Physics and Astronomy Faculty Publications

Solar Constraints On New Couplings Between Electromagnetism And Gravity, S. K. Solanki, O. Preuss, M. P. Haugan, A. Gandorfer, H. P. Povel, P. Steiner, K. Stucki, P. N. Bernasconi, D. Soltau

Department of Physics and Astronomy Faculty Publications

Enhanced Mass Sensing Using Torsional And Lateral Resonances In Microcantilevers, L. B. Sharos, A. Raman, S. Crittenden, R. Reifenberger

Department of Physics and Astronomy Faculty Publications

Cessation Of X-Ray Pulsation Of Gx 1+4, W. Cui, B. Smith

Department of Physics and Astronomy Faculty Publications

Change In Speed And Direction Of The Jet Near The Core In The Quasar 3c 279, S. G. Jorstad, A. P. Marscher, M. L. Lister, A. M. Stirling, T. V. Cawthorne, J. L. Gomez, W. K. Gear

Department of Physics and Astronomy Faculty Publications

X-Ray Spectral Variability Of Extreme Bl Lacertae Active Galactic Nucleus H1426+428, A. D. Falcone, W. Cui, J. P. Finley

Department of Physics and Astronomy Faculty Publications

Department of Physics and Astronomy Faculty Publications

Department of Physics and Astronomy Faculty Publications

X-Ray Flaring Activity Of Markarian 421, W. Cui

Department of Physics and Astronomy Faculty Publications

Rfabsorption Involving Biological Macromolecules, E. W. Prohofsky

Department of Physics and Astronomy Faculty Publications

Fourier-Domain Holography In Photorefractive Quantum-Well Films, K. Jeong, L. L. Peng, D. D. Nolte, M. R. Melloch

Department of Physics and Astronomy Faculty Publications

Department of Physics and Astronomy Faculty Publications