Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons

Open Access. Powered by Scholars. Published by Universities.®

175,573 Full-Text Articles 210,672 Authors 37,243,081 Downloads 370 Institutions

All Articles in Physical Sciences and Mathematics

Faceted Search

175,573 full-text articles. Page 4146 of 4573.

Stability Of A Strongly Anisotropic Thin Epitaxial Film In A Wetting Interaction With Elastic Substrate, Mikhail Khenner, Wondimu T. Tekalign, Margo S. Levine 2010 Western Kentucky University

Stability Of A Strongly Anisotropic Thin Epitaxial Film In A Wetting Interaction With Elastic Substrate, Mikhail Khenner, Wondimu T. Tekalign, Margo S. Levine

Mikhail Khenner

The linear dispersion relation for longwave surface perturbations, as derived by Levine et al. Phys. Rev. B 75, 205312 (2007) is extended to include a smooth surface energy anisotropy function with a variable anisotropy strength (from weak to strong, such that sharp corners and slightly curved facets occur on the corresponding Wulff shape). Through detailed parametric studies it is shown that a combination of a wetting interaction and strong anisotropy, and even a wetting interaction alone results in complicated linear stability characteristics of strained and unstrained films.


Forensic Triage For Mobile Phones With Dec0de, Robert Walls, Brian N. Levine, Erik G. Learned-Miller 2010 University of Massachusetts - Amherst

Forensic Triage For Mobile Phones With Dec0de, Robert Walls, Brian N. Levine, Erik G. Learned-Miller

Erik G Learned-Miller

We present DEC0DE, a system for recovering information from phones with unknown storage formats, a critical problem for forensic triage. Because phones have myr- iad custom hardware and software, we examine only the stored data. Via flexible descriptions of typical data struc- tures, and using a classic dynamic programming algo- rithm, we are able to identify call logs and address book entries in phones across varied models and manufactur- ers. We designed DEC0DE by examining the formats of one set of phone models, and we evaluate its performance on other models. Overall, we are able to obtain high performance for ...


Deep Near-Infrared Spectroscopy Of Passively Evolving Galaxies At Z & 1.4^1, M. Onodera, A. Renzini, M. Carollo, M. Cappellari, C. Mancini, V. Strazzullo, E. Daddi, N. Arimoto, R. Gobat, Y. Yamada, H. J. McCracken, O. Ilbert, P. Capak, A. Cimatti, Mauro Giavalisco, M. Giavalisco, A. M. Koekemoer, X. Kong, S. Lilly, K. Motohara, K. Ohta, D. B. Sanders, N. Scoville, N. Tamura, Y. Taniguchi 2010 University of Massachusetts - Amherst

Deep Near-Infrared Spectroscopy Of Passively Evolving Galaxies At Z & 1.4^1, M. Onodera, A. Renzini, M. Carollo, M. Cappellari, C. Mancini, V. Strazzullo, E. Daddi, N. Arimoto, R. Gobat, Y. Yamada, H. J. Mccracken, O. Ilbert, P. Capak, A. Cimatti, Mauro Giavalisco, M. Giavalisco, A. M. Koekemoer, X. Kong, S. Lilly, K. Motohara, K. Ohta, D. B. Sanders, N. Scoville, N. Tamura, Y. Taniguchi

Mauro Giavalisco

We present the results of new near-IR spectroscopic observations of passive galaxies at z & 1.4 in a concentration of BzK-selected galaxies in the COSMOS field. The observations have been conducted with Subaru/ MOIRCS, and have resulted in absorption lines and/or continuum detection for 18 out of 34 objects. This allows us to measure spectroscopic redshifts for a sample that is almost complete to KAB = 21. COSMOS photometric redshifts are found in fair agreement overall with the spectroscopic redshifts, with a standard deviation of ∼ 0.05; however, ∼ 30% of objects have photometric redshifts systematically underestimated by up to ∼ 25%. We show that these systematic offsets in photometric redshifts can be removed by using these objects as a training set. All galaxies fall in four distinct redshift spikes at z = 1.43, 1.53, 1.67 and 1.82, with this latter one including 7 galaxies. SED fits to broad-band fluxes indicate stellar masses in the range of ∼ 4–40×1010M⊙ and that star formation was quenched ∼ 1 Gyr before the cosmic epoch ...


Goods-Herschel: An Infrared Main Sequence For Star-Forming Galaxies, D. Elbaz, M. Dickinson, H. S. Hwang, T. Díaz-Santos, G. Magdis, B. Magnelli, D. Le Borgne, F. Galliano, M. Pannella, P. Chanial, L. Armus, V. Charmandaris, E. Daddi, H. Aussel, P. Popesso, J. Kartaltepe, B. Altieri, I. Valtchanov, D. Coia, H. Dannerbauer, K. Dasyra, R. Leiton, J. Mazzarella, D. M. Alexander, V. Buat, D. Burgarella, R-R. Chary, R. Gilli, R. J. Ivison, S. Juneau, E. Le Floc'h, D. Lutz, G. E. Morrison, J. R. Mullaney, E. Murphy, A. Pope, D. Scott, M. Brodwin, D. Calzetti, C. Cesarsky, S. Charlot, H. Dole, P. Eisenhardt, H. C. Ferguson, N. Förster Schreiber, D. Frayer, Mauro Giavalisco, M. Huynh, A. M. Koekemoer, C. Papovich, N. Reddy, C. Surace, H. Teplitz, M. S. Yun, G. Wilson 2010 University of Massachusetts - Amherst

Goods-Herschel: An Infrared Main Sequence For Star-Forming Galaxies, D. Elbaz, M. Dickinson, H. S. Hwang, T. Díaz-Santos, G. Magdis, B. Magnelli, D. Le Borgne, F. Galliano, M. Pannella, P. Chanial, L. Armus, V. Charmandaris, E. Daddi, H. Aussel, P. Popesso, J. Kartaltepe, B. Altieri, I. Valtchanov, D. Coia, H. Dannerbauer, K. Dasyra, R. Leiton, J. Mazzarella, D. M. Alexander, V. Buat, D. Burgarella, R-R. Chary, R. Gilli, R. J. Ivison, S. Juneau, E. Le Floc'h, D. Lutz, G. E. Morrison, J. R. Mullaney, E. Murphy, A. Pope, D. Scott, M. Brodwin, D. Calzetti, C. Cesarsky, S. Charlot, H. Dole, P. Eisenhardt, H. C. Ferguson, N. Förster Schreiber, D. Frayer, Mauro Giavalisco, M. Huynh, A. M. Koekemoer, C. Papovich, N. Reddy, C. Surace, H. Teplitz, M. S. Yun, G. Wilson

Mauro Giavalisco

We present the deepest far-IR observations obtained with Herschel and examine the 3-500um SEDs of galaxies at 03x10^10 Lsun kpc^-2) and a high specific SFR (i.e., SBs). The rest-frame, UV-2700A size of these distant SBs is typically half that of MS galaxies, supporting the correlation between star formation density and SB activity that is measured for the local sample. Locally, (U)LIRGs are systematically in the SB mode, whereas most distant (U)LIRGs form stars in the "normal" MS mode. This confusion between two modes of star formation is the cause of the so-called "mid-IR excess" population ...


Computational Style Processing, Foaad Khosmood 2010 California Polytechnic State University - San Luis Obispo

Computational Style Processing, Foaad Khosmood

Foaad Khosmood

Our main thesis is that computational processing of natural language styles can be accomplished using corpus analysis methods and language transformation rules. We demonstrate this first by statistically modeling natural language styles, and second by developing tools that carry out style processing, and finally by running experiments using the tools and evaluating the results. Specifically, we present a model for style in natural languages, and demonstrate style processing in three ways: Our system analyzes styles in quantifiable terms according to our model (analysis), associates documents based on stylistic similarity to known corpora (classification) and manipulates texts to match a desired ...


Asymmetry In Chemical Structures And In Life: My Last Two Articles, Otto Vogl 2010 University of Massachusetts - Amherst

Asymmetry In Chemical Structures And In Life: My Last Two Articles, Otto Vogl

Otto Vogl

No abstract provided.


Collaborative Scientific Workflows Supporting Collaborative Science, Shiyong Lu, Jia Zhang 2010 Northern Illinois University

Collaborative Scientific Workflows Supporting Collaborative Science, Shiyong Lu, Jia Zhang

Jia Zhang

No abstract provided.


On The Clustering Of Sub-Millimeter Galaxies, Christina C. Williams, Mauro Giavalisco, Cristiano Porciani, Min S. Yun, Alexandra Pope, Kimberly S. Scott, Jason E. Austermann, Itziar Aretxaga, Bunyo Hatsukade, Kyoung-Soo Lee, Grant W. Wilson, J. Ryan Cybulski, David H. Hughes, Ryo Kawabe, Kotaro Kohno, Thushara Perera, F. Peter Schloerb 2010 University of Massachusetts - Amherst

On The Clustering Of Sub-Millimeter Galaxies, Christina C. Williams, Mauro Giavalisco, Cristiano Porciani, Min S. Yun, Alexandra Pope, Kimberly S. Scott, Jason E. Austermann, Itziar Aretxaga, Bunyo Hatsukade, Kyoung-Soo Lee, Grant W. Wilson, J. Ryan Cybulski, David H. Hughes, Ryo Kawabe, Kotaro Kohno, Thushara Perera, F. Peter Schloerb

Mauro Giavalisco

We measure the angular two-point correlation function of sub-millimeter galaxies (SMGs) from 1.1-millimeter imaging of the COSMOS field with the AzTEC camera and ASTE 10-meter telescope. These data yields one of the largest contiguous samples of SMGs to date, covering an area of 0.72 degrees^2 down to a 1.26 mJy/beam (1-sigma) limit, including 189 (328) sources with S/N greater than 3.5 (3). We can only set upper limits to the correlation length r_0, modeling the correlation function as a power-law with pre-assigned slope. Assuming existing redshift distributions, we derive 68.3% confidence level ...


Effect Of Passive Integrated Transponder Tag Implantation Site On Tag Retention, Growth, And Survival Of Two Sizes Of Juvenile Bluegills And Yellow Perch, Mark A. Kaemingk, Michael J. Weber, Paul R. McKenna, Michael L. Brown 2010 South Dakota State University

Effect Of Passive Integrated Transponder Tag Implantation Site On Tag Retention, Growth, And Survival Of Two Sizes Of Juvenile Bluegills And Yellow Perch, Mark A. Kaemingk, Michael J. Weber, Paul R. Mckenna, Michael L. Brown

Michael J Weber

Passive integrated transponder (PIT) tags are commonly used to monitor growth, habitat use, activity rates, and survival of individual fish. However, for successful completion of research objectives, the tags must be retained and must not affect fish growth or survival. We compared the effects of PIT tagging location on tag retention, growth, and survival of juvenile bluegills Lepomis macrochirus and yellow perchPerca flavescens. In total, 80 bluegills and 80 yellow perch from two size-classes (75–101 and 128–162 mm total length) were randomly assigned to a control or to one of three tagging location treatments: isthmus, body cavity ...


A Practical Ad-Hoc Adjustment To The Simes P-Value, Chris Lloyd 2010 Melbourne Business School

A Practical Ad-Hoc Adjustment To The Simes P-Value, Chris Lloyd

Chris J. Lloyd

The Simes P-value is more powerful than Bonferroni but still suffers from some conservatism when the tests are correlated. Based on a massive simulation study, I develop a formula that corrects for this conservatism. it requires the number of experimental arms which is known. It also requires the correlation and skewness of the underlying test statistics, which will need analytic approximation in practice.


Evolution Of The Loop Current System During The Deepwater Horizon Oil Spill Event As Observed With Drifters And Satellites, Yonggang Liu, Robert H. Weisberg, Charles Kovach, Rolf Riethmüller 2010 University of South Florida

Evolution Of The Loop Current System During The Deepwater Horizon Oil Spill Event As Observed With Drifters And Satellites, Yonggang Liu, Robert H. Weisberg, Charles Kovach, Rolf Riethmüller

Yonggang Liu

The ocean circulation patterns of the Gulf of Mexico (GOM) Loop Current (LC) system and their effects on the advection of the oil discharged during the Deepwater Horizon incident are described using in situ surface drifter trajectories and satellite observations from May to August 2010. These observations include altimetry-derived surface geostrophic velocities, sea surface temperature, ocean color, and surface oil locations. The elongated, northwestward penetrating LC retreated back from its northernmost position in late April 2010 and stayed farther away from the surface oil in the north during May 2010. Although the main body of the surface oil slick remained ...


Thermally, Photochemically And Electrically Switchable Reflection Colors From Self-Organized Chiral Bent-Core Liquid Crystals, Quan Li, Manoj Mathews, Rafael S. Zola, Deng-ke Yang 2010 Kent State University - Kent Campus

Thermally, Photochemically And Electrically Switchable Reflection Colors From Self-Organized Chiral Bent-Core Liquid Crystals, Quan Li, Manoj Mathews, Rafael S. Zola, Deng-Ke Yang

Quan Li

We report the synthesis and characterization of two new chiral 1,3-phenylene based five ring bent-core mesogens that combine the unique electro-optic characteristics of banana-shaped molecules with chiroptic properties. Azobenzene moiety incorporated as a linking unit in one of the rigid arms renders trans cis isomerization property to the molecules while chirality is introduced by tethering chiral aliphatic terminal chains. Both compounds can self-organize into helical superstructure, i.e. cholesteric mesophase, which can selectively reflect light. The novelty of the helical self-organized superstructure reported here lies in its low molecular weight single component molecular system that is truly multifunctional so ...


Self-Organized Photochromic Dithienylcyclopentene Organogels, Krishnamurthy Rameshbabu, Lu Zuo, Chanjoong Kim, Augustine Urbas, Quan Li 2010 Kent State University - Kent Campus

Self-Organized Photochromic Dithienylcyclopentene Organogels, Krishnamurthy Rameshbabu, Lu Zuo, Chanjoong Kim, Augustine Urbas, Quan Li

Chanjoong Kim

A series of photochromic organogelators based on dithienylcyclopentene amides with a phenylene unit as a bridge between the amide and long alkyl chain were synthesized, their gelation behaviors were characterized by rheology, FT-IR, H-1 NMR, SEM, optical microscopy, UV-Vis and fluorescence spectroscopy. These organogelator molecules were found to be able to induce gelation in apolar solvents such as benzene, toluene and p-xylene to form entangled networks driven by intermolecular hydrogen bonding together with pi-pi interactions. Their excellent reversible photochromism with thermal stability in both solution and gel states was observed, and the thermally reversible property in sol-gel transition was exhibited.


Climate Change In Central America And Mexico: Regional Climate Model Validation And Climate Change Projections, Ambarish V. Karmalkar, Raymond S. Bradley, Henry F. Diaz 2010 University of Massachusetts - Amherst

Climate Change In Central America And Mexico: Regional Climate Model Validation And Climate Change Projections, Ambarish V. Karmalkar, Raymond S. Bradley, Henry F. Diaz

Raymond S Bradley

Central America has high biodiversity, it harbors high-value ecosystems and it’s important to provide regional climate change information to assist in adaptation and mitigation work in the region. Here we study climate change projections for Central America and Mexico using a regional climate model. The model evaluation shows its success in simulating spatial and temporal variability of temperature and precipitation and also in capturing regional climate features such as the bimodal annual cycle of precipitation and the Caribbean low-level jet. A variety of climate regimes within the model domain are also better identified in the regional model simulation due ...


Partial Duplicate Detection For Large Book Collections, Ismet Zeki Yalniz, Ethem F. Can, R. Manmatha 2010 University of Massachusetts - Amherst

Partial Duplicate Detection For Large Book Collections, Ismet Zeki Yalniz, Ethem F. Can, R. Manmatha

R. Manmatha

A framework is presented for discovering partial duplicates in large collections of scanned books with optical character recognition (OCR) errors. Each book in the collection is represented by the sequence of words (in the order they appear in the text) which appear only once in the book. These words are referred to as ``unique words'' and they constitute a small percentage of all the words in a typical book. Along with the order information the set of unique words provides a compact representation which is highly descriptive of the content and the flow of ideas in the book. By aligning ...


Distal Tephra Found In A Viking Boathouse: The Potential For Tephrochronology In Reconstructing The Iron Age In Norway, Nicholas L. Balascio, Stephen Wickler, L E. Narmo, Raymond S. Bradley 2010 College of William and Mary

Distal Tephra Found In A Viking Boathouse: The Potential For Tephrochronology In Reconstructing The Iron Age In Norway, Nicholas L. Balascio, Stephen Wickler, L E. Narmo, Raymond S. Bradley

Raymond S Bradley

Distal tephra deposits from Icelandic volcanic eruptions have been found in Norway and can be used to precisely date a variety of sedimentary environments. Tephrochronology has not yet been applied to archaeological investigations in Norway because tephra are generally not found as visible layers, but are present as very low concentrations of glass shards (i.e. cryptotephra). In this study, we present results from the analysis of cryptotephras found in an Iron Age boathouse in northern Norway. The boathouse was associated with the chieftain center at Borg on Vestvågøy in the Lofoten Islands. In 2003, a trench was excavated and ...


The Resolved Stellar Population In 50 Regions Of M83 From Hst/Wfc3 Early Release Science Observations, Hwihyun Kim, Bradley C. Whitmore, Rupali Chandar, Abhijit Saha, Catherine C. Kaleida, Max Mutchler, Seth H. Cohen, Daniela Calzetti, Robert W. O'Connel, Rogier A. Windhorst, Bruce Balick, Howard E. Bond, C. Marcella Carollo, Michael J. Disney, Michael A. Dopita, Jay A. Frogel, Donald N. B. Hall, Jon A. Holtzman, Randy A. Kimble, Patrick J. McCarthy, Francesco Paresce, Joe I. Silk, John T. Trauger, Alistair R. Walker, Erick T. Young 2010 University of Massachusetts - Amherst

The Resolved Stellar Population In 50 Regions Of M83 From Hst/Wfc3 Early Release Science Observations, Hwihyun Kim, Bradley C. Whitmore, Rupali Chandar, Abhijit Saha, Catherine C. Kaleida, Max Mutchler, Seth H. Cohen, Daniela Calzetti, Robert W. O'Connel, Rogier A. Windhorst, Bruce Balick, Howard E. Bond, C. Marcella Carollo, Michael J. Disney, Michael A. Dopita, Jay A. Frogel, Donald N. B. Hall, Jon A. Holtzman, Randy A. Kimble, Patrick J. Mccarthy, Francesco Paresce, Joe I. Silk, John T. Trauger, Alistair R. Walker, Erick T. Young

Daniela Calzetti

We present a multi-wavelength photometric study of ~15,000 resolved stars in the nearby spiral galaxy M83 (NGC5236, D=4.61Mpc) based on Hubble Space Telescope Wide Field Camera 3 observations using four filters: F336W, F438W, F555W, and F814W. We select 50 regions (an average size of 260 pc by 280 pc) in the spiral arm and inter-arm areas of M83, and determine the age distribution of the luminous stellar populations in each region. This is accomplished by correcting for extinction towards each individual star by comparing its colors with predictions from stellar isochrones. We compare the resulting luminosity weighted ...


Kernel Regression In The Presence Of Correlated Errors, Kris De Brabanter, Jos De Brabanter, Johan A.K. Suykens, Bart De Moor 2010 KU Leuven

Kernel Regression In The Presence Of Correlated Errors, Kris De Brabanter, Jos De Brabanter, Johan A.K. Suykens, Bart De Moor

Kris De Brabanter

It is a well-known problem that obtaining a correct bandwidth and/or smoothing parameter in nonparametric regression is difficult in the presence of correlated errors. There exist a wide variety of methods coping with this problem, but they all critically depend on a tuning procedure which requires accurate information about the correlation structure. We propose a bandwidth selection procedure based on bimodal kernels which successfully removes the correlation without requiring any prior knowledge about its structure and its parameters. Further, we show that the form of the kernel is very important when errors are correlated which is in contrast to ...


Mcmcpack: Markov Chain Monte Carlo In R, Kevin M. Quinn, Andrew D. Martin, Jong Hee Park 2010 Berkeley Law

Mcmcpack: Markov Chain Monte Carlo In R, Kevin M. Quinn, Andrew D. Martin, Jong Hee Park

Kevin M. Quinn

No abstract provided.


Aztec 1.1 Mm Observations Of The Mbm12 Molecular Cloud, M. J. Kim, S. Kim, S. Youn, M. S. Yun, Grant Wilson, I. Aretxaga, J. P. Williams, D. H. Hughes, A. Humphrey, J. E. Austermann, T. A. Perera, P. D. Mauskopf, L. Magnani, Y.-W. Kang 2010 University of Massachusetts - Amherst

Aztec 1.1 Mm Observations Of The Mbm12 Molecular Cloud, M. J. Kim, S. Kim, S. Youn, M. S. Yun, Grant Wilson, I. Aretxaga, J. P. Williams, D. H. Hughes, A. Humphrey, J. E. Austermann, T. A. Perera, P. D. Mauskopf, L. Magnani, Y.-W. Kang

Grant Wilson

We present 1.1 mm observations of the dust continuum emission from the MBM12 high-latitude molecular cloud observed with the Astronomical Thermal Emission Camera (AzTEC) mounted on the James Clerk Maxwell Telescope on Mauna Kea, Hawaii. We surveyed a 6.34 deg$^2$ centered on MBM12, making this the largest area that has ever been surveyed in this region with submillimeter and millimeter telescopes. Eight secure individual sources were detected with a signal-to-noise ratio of over 4.4. These eight AzTEC sources can be considered to be real astronomical objects compared to the other candidates based on calculations of the ...


Digital Commons powered by bepress