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Articles 1651 - 1680 of 2389
Full-Text Articles in Entire DC Network
The Chromospheric Activity, Age, Metallicity, And Space Motions Of 36 Wide Binaries, J. K. Zhao, T. D. Oswalt, M. Rudkin, G. Zhao, Y. Q. Chen
The Chromospheric Activity, Age, Metallicity, And Space Motions Of 36 Wide Binaries, J. K. Zhao, T. D. Oswalt, M. Rudkin, G. Zhao, Y. Q. Chen
Publications
We present the chromospheric activity (CA) levels, metallicities, and full space motions for 41 F, G, K, and M dwarf stars in 36 wide binary systems. Thirty-one of the binaries contain a white dwarf (WD) component. In such binaries, the total age can be estimated by adding the cooling age of the WD to an estimate of the progenitor’s main-sequence lifetime. To better understand how CA correlates to stellar age, 14 cluster member stars were also observed. Our observations demonstrate for the first time that, in general, CA decays with age from 50 Myr to at least 8 Gyr for …
On The Stability Of A Microstructure Model, Mihhail Berezovski, Arkadi Berezovski
On The Stability Of A Microstructure Model, Mihhail Berezovski, Arkadi Berezovski
Publications
The asymptotic stability of solutions of the Mindlin-type microstructure model for solids is analyzed in the paper. It is shown that short waves are asymptotically stable even in the case of a weakly non-convex free energy dependence on microdeformation.
The Nature Of "Dark" Gamma-Ray Bursts, J. Greiner, T. Krühler, S. Klose, P. Afonso, C. Clemens, R. Filgas, Dieter H. Hartmann, A. Küpcü Yoldas, M. Nardini, F. Olivares E., A Rau, A Rossi, P Schady, A Updike
The Nature Of "Dark" Gamma-Ray Bursts, J. Greiner, T. Krühler, S. Klose, P. Afonso, C. Clemens, R. Filgas, Dieter H. Hartmann, A. Küpcü Yoldas, M. Nardini, F. Olivares E., A Rau, A Rossi, P Schady, A Updike
Publications
Context. Thirteen years after the discovery of the first afterglows, the nature of dark gamma-ray bursts (GRB) still eludes explanation: while each long-duration GRB typically has an X-ray afterglow, optical/NIR emission is only seen for 40-60% of them. Aims. Here we use the afterglow detection statistics of the systematic follow-up observations performed with GROND since mid-2007 in order to derive the fraction of “dark bursts” according to different methods, and to distinguish between various scenarios for “dark bursts”. Methods. Observations were performed with the 7-channel “Gamma-Ray Optical and Near-infrared Detector” (GROND) at the 2.2m MPI/ESO telescope. We used the afterglow …
Incoherent Scatter Radar Estimation Of F Region Ionospheric Composition During Frictional Heating Events, M. Zettergren, J. L. Semeter, C. Heinselman, M. Diaz
Incoherent Scatter Radar Estimation Of F Region Ionospheric Composition During Frictional Heating Events, M. Zettergren, J. L. Semeter, C. Heinselman, M. Diaz
Publications
A method is developed for estimating F region ion composition from incoherent scatter radar (ISR) measurements during times of frictional ion heating. The technique addresses ion temperature‐mass ambiguities in the IS spectra by self‐consistently modeling ion temperature profiles, including the effects of ion temperature anisotropies and altitude‐independent neutral winds. The modeled temperature profiles are used in a minimization procedure to estimate ion composition consistent with the recorded IS spectra. The proposed method is applicable to short‐integration (min) data sets from either single‐beam or multiple‐beam experiments. Application of the technique to Sondrestrom ISR measurements shows increases in F region molecular ions …
Decolorization Of Azo Dye (Orange Mr) By An Autochthonous Bacterium, Micrococcus Sp. Dbs 2, Rajee Olaganathan, Jamila Patterson
Decolorization Of Azo Dye (Orange Mr) By An Autochthonous Bacterium, Micrococcus Sp. Dbs 2, Rajee Olaganathan, Jamila Patterson
Publications
Soil and sediment samples obtained from Orange MR dye contaminated habitat were screened for heterotrophic bacterial population. The heterotrophic bacterial density of dye-contaminated soil was 2.14 9 106 CFU/g. The generic composition of heterotrophic bacterial population was primarily composed of 10% of Proteus sp., 15% Aeromonas sp., 20% Bacillus sp., 25% Pseudomonas sp. and 30% Micrococcus sp. The bacterial strain that decolorized the azo dye Orange MR up to 900 ppm was identified as Micrococcus sp. The optimum inoculum load, pH and temperature were found to be 5%, 6 and 35°C, respectively. The rate of decolorization was assessed using spectrophotometer …
The Architecture Of California Polytechnic State University 1980-2010, Facilities Planning And Capital Projects, California Polytechnic State University - San Luis Obispo
The Architecture Of California Polytechnic State University 1980-2010, Facilities Planning And Capital Projects, California Polytechnic State University - San Luis Obispo
Publications
The book is dedicated to the presidency of Dr. Warren J. Baker at California Polytechnic State University at San Luis Obispo, California. President Baker’s leadership and vision over the past three decades has placed Cal Poly as one the premier undergraduate universities in the country. The following pages will demonstrate how this vision enabled state–of-the-art buildings to support the high level of education provided by the faculty of this university. He promoted an infrastructure and physical campus where students can live and learn. He envisioned the need for sustainability long before it was implemented as a building requirement. Because of …
A Characterization Of Power Method Transformations Through L-Moments, Todd C. Headrick
A Characterization Of Power Method Transformations Through L-Moments, Todd C. Headrick
Publications
Power method polynomial transformations are commonly used for simulating continuous nonnormal distributions with specified moments. However, conventional moment-based estimators can (a) be substantially biased, (b) have high variance, or (c) be influenced by outliers. In view of these concerns, a characterization of power method transformations by L-moments is introduced. Specifically, systems of equations are derived for determining coefficients for specified L-moment ratios, which are associated with standard normal and standard logistic-based polynomials of order five and three. Boundaries for L-moment ratios are also derived, and closed-formed formulae are provided for determining if a power method distribution has …
A New Pulsar Instrumentation At The Allen Telescope Array And The Nancay Radio Telescope, G. Desvignes, William C. Barott, I. Cognard, P. Lespagnol, G. Theureau
A New Pulsar Instrumentation At The Allen Telescope Array And The Nancay Radio Telescope, G. Desvignes, William C. Barott, I. Cognard, P. Lespagnol, G. Theureau
Publications
In the prospect of the gravitational wave background detection with high precision pulsar timing, we recently installed a new coherent dedispersion backend at the Allen Telescope Array (ATA) and the Nançay Radio Telescope (NRT).
A Possible Pathway For High School Science In A Stem World, Cary Sneider
A Possible Pathway For High School Science In A Stem World, Cary Sneider
Publications
Today‘s high school science teachers find themselves in a period of transition. For the past decade there have been calls for replacing a narrow focus on science education—the traditional courses in physics, chemistry, biology, and Earth and space science—with a broader curriculum on STEM (that is, the four allied fields of science, technology, engineering, and mathematics). However, at present there are no guidelines on what that broader curriculum should include or how it should be designed, and the gulf that has separated science and mathematics seems as wide as ever, despite decades of efforts to bridge the two disciplines. Next …
Mapping Engineering Concepts For Secondary Level Education, Jenny L. Daugherty
Mapping Engineering Concepts For Secondary Level Education, Jenny L. Daugherty
Publications
Much of the national attention on science, technology, engineering, and mathematics (STEM) education tends to concentrate on science and mathematics, with its emphasis on standardized test scores. However as the National Academy of Engineering Committee on K-12 Engineering Education stressed, engineering can contribute to the development of an effective and interconnected STEM education system (Katehi, Pearson, & Feder, 2009). In addition, engineering can provide authentic learning contexts for science, technology, and mathematics. Numerous K-12 engineering initiatives have emerged across the U.S. developing curriculum and conducting teacher professional development (Brophy, Klein, Portsmore, & Rogers, 2008). The focus of pre-college engineering education …
Mapping Engineering Concepts For Secondary Level Education, J. L. Daugherty
Mapping Engineering Concepts For Secondary Level Education, J. L. Daugherty
Publications
No abstract provided.
Engineering Design Thinking And Information Gathering Final Report, Nathan Mentzer
Engineering Design Thinking And Information Gathering Final Report, Nathan Mentzer
Publications
The objective of this research was to explore the relationship between information access and design solution quality of high school students presented with an engineering design problem. This objective is encompassed in the research question driving this inquiry: How does information access impact the design process? This question has emerged in the context of an exploratory DR-K12 grant project titled, Exploring Engineering Design Knowing and Thinking as an Innovation in STEM Learning. The research work presented here has expanded the data set developed in the DR-K12 and examined the larger data set with a focus on how information access impacts …
Understanding Of Student Task Interpretation, Design Planning, And Cognitive Strategies During Engineering Design Activities In Grades 9-12, Oenardi Lawanto
Understanding Of Student Task Interpretation, Design Planning, And Cognitive Strategies During Engineering Design Activities In Grades 9-12, Oenardi Lawanto
Publications
The objective of this study was to describe the task interpretation of students engaged in a design activity and determine the extent to which students translate their understanding of their design task to their planning and cognitive strategies. Twenty-nine students at one Colorado high school participated in this study. Students worked individually in the Architectural Design class (n=7), and in teams in the Robotics Design class (n=22). To capture students’ perceptions of their understanding of the task, planning strategies, and cognitive strategies, the Engineering Design Questionnaire (EDQ) was used. The development of the EDQ was guided by Butler and Cartier’s …
Design Problems For Secondary Students, David H. Jonassen
Design Problems For Secondary Students, David H. Jonassen
Publications
Are there different kinds of design problems? According to Brown and Chandrasekaran (1989), Class 1 design problems are open-ended, non-routine creative activities where the goals are ill-structured, and there is no effective design plan specifying the sequence of actions to take in producing a design model. Class 2 problems use existing, well-developed design and decomposition plans (e.g. designing a new automobile). Class 3 designs are routine where design and decomposition plans are known as well as customary actions taken to deal with failures (e.g., writing a computer program). Jonassen (2011) argued that problems vary in terms of structuredness, complexity, and …
Integrating Engineering Design Challenges Into Secondary Stem Education, Ronald L. Carr
Integrating Engineering Design Challenges Into Secondary Stem Education, Ronald L. Carr
Publications
Engineering is being currently taught in the full spectrum of the P-12 system, with an emphasis on design-oriented teaching (Brophy, Klein, Portsmore, & Rogers, 2008). Due to only a small amount of research on the learning of engineering design in elementary and middle school settings, the community of practice lacks the necessary knowledge of the trajectory of students' learning progressions towards design mastery and expertise and the appropriateness of otherwise established design pedagogies. The issue is even more pressing since many states are embedding engineering into their standards without a clear notion of how engineering (often conceptualized as design) works …
Building A Framework For Engineering Design Experiences In Stem: A Synthesis, Cameron D. Denson
Building A Framework For Engineering Design Experiences In Stem: A Synthesis, Cameron D. Denson
Publications
Since the inception of the National Center for Engineering and Technology Education in 2004, educators and researchers have struggled to identify the necessary components of a “good” engineering design challenge for high school students. In reading and analyzing the position papers on engineering design many themes emerged that may begin to form a narrative for engineering design in a high school setting. Before educators can provide a framework for engineering design in STEM courses, four questions need to be answered: (a) To what degree should engineering design challenges be open-ended or well-structured? (b) What are the relationships between engineering design …
Hydrodynamic Stability Of The Painted Turtle (Chrysemys Picta): Effects Of Four-Limbed Rowing Versus Forelimb Flapping In Rigid-Bodied Tetrapods. , Gabriel Rivera, Angela R.V. Rivera, Richard W. Blob
Hydrodynamic Stability Of The Painted Turtle (Chrysemys Picta): Effects Of Four-Limbed Rowing Versus Forelimb Flapping In Rigid-Bodied Tetrapods. , Gabriel Rivera, Angela R.V. Rivera, Richard W. Blob
Publications
Hydrodynamic stability is the ability to resist recoil motions of the body produced by destabilizing forces. Previous studies have suggested that recoil motions can decrease locomotor performance, efficiency and sensory perception and that swimming animals might utilize kinematic strategies or possess morphological adaptations that reduce recoil motions and produce more stable trajectories. We used high-speed video to assess hydrodynamic stability during rectilinear swimming in the freshwater painted turtle (Chrysemys picta). Parameters of vertical stability (heave and pitch) were non-cyclic and variable, whereas measures of lateral stability (sideslip and yaw) showed repeatable cyclic patterns. In addition, because freshwater and marine turtles …
Biodiesel Production From Crude Cottonseed Oil: An Optimization Process Using Response Surface Methodology, Xiaohu Fan, Xi Wang, Feng Chen
Biodiesel Production From Crude Cottonseed Oil: An Optimization Process Using Response Surface Methodology, Xiaohu Fan, Xi Wang, Feng Chen
Publications
Biodiesel, known as fatty acid methyl ester (FAME), was produced from crude cottonseed oil (triglycerides) by transesterification with methanol in the presence of sodium hydroxide. This process was optimized by applying factorial design and response surface methodology (RSM) with SAS and PSIPLOT programs. A second-order mathematical model was obtained to predict the yield as a function of methanol/oil molar ratio, catalyst concentration, reaction temperature, and rate of mixing. Based on ridge max analysis and RSM, as well as economic cost consideration, the practical optimal condition for the production of biodiesel was found to be: methanol/oil molar ratio, 7.9; temperature, 53 …
Infusing Engineering Design Into High School Stem Courses, Morgan Hynes, Merredith Portsmore, Emily Dare, Elissa Milto, Chris Rogers, David Hammer, Adam Carberry
Infusing Engineering Design Into High School Stem Courses, Morgan Hynes, Merredith Portsmore, Emily Dare, Elissa Milto, Chris Rogers, David Hammer, Adam Carberry
Publications
Society is recognizing the need to improve STEM education and introduce engineering design concepts before college. In the recent National Academy of Engineers report, Engineering in K-12 Education: Understanding the Status and Improving the Prospects, the authors suggest that the STEM disciplines not be treated as ―silos‖ and that engineering might serve as a motivating context to integrate the four STEM disciplines (Katehi, Pearson, & Feder, 2009). Recent research has suggested that integrated technology and engineering design curriculum can serve as a positive model for mathematics and science learning and retention (Ortiz, 2010; Wendell, 2011). The Tufts University Center for …
Engineering Design Challenges In High School Stem Courses A Compilation Of Invited Position Papers, Daniel L. Householder
Engineering Design Challenges In High School Stem Courses A Compilation Of Invited Position Papers, Daniel L. Householder
Publications
Since its initial funding by the National Science Foundation in 2004, the National Center for Engineering and Technology Education (NCETE) has worked to understand the infusion of engineering design experiences into the high school setting. Over the years, an increasing number of educators and professional groups have participated in the expanding initiative seeking to acquaint all students with engineering design. While there is strong support for providing students with engineering design experiences in their high school STEM courses, the lack of consensus on purposes and strategies has become increasingly apparent as the work continues. Among the unsettled issues are the …
Origin: Metal Creation And Evolution From The Cosmic Dawn, J. W. Den Herder, L. Piro, T. Ohashi, C. Kouveliotou, Dieter H. Hartmann, J. Kaastra, L. Amati, M. I. Andersen, M. Arnaud, J.-L. Attéia
Origin: Metal Creation And Evolution From The Cosmic Dawn, J. W. Den Herder, L. Piro, T. Ohashi, C. Kouveliotou, Dieter H. Hartmann, J. Kaastra, L. Amati, M. I. Andersen, M. Arnaud, J.-L. Attéia
Publications
ORIGIN is a proposal for the M3 mission call of ESA aimed at the study of metal creation from the epoch of cosmic dawn. Using high-spectral resolution in the soft X-ray band, ORIGIN will be able to identify the physical conditions of all abundant elements between C and Ni to red-shifts of z=10, and beyond. The mission will answer questions such as: When were the first metals created? How does the cosmic metal content evolve? Where do most of the metals reside in the Universe? What is the role of metals in structure formation and evolution? To reach out to …
The Swift/Fermi Grb 080928 From 1 Ev To 150 Kev, A. Rossi, S. Schulze, S. Klose, D. A. Kann, A. Rau, H. A. Krimm, G. Jóhannesson, A. Panaitescu, F. Yuan, P Ferrero, T Krühler, J Greiner, P Schady, S B. Pandey, L Amati, P.M.F. Afonso, C W. Akerlof, L A. Arnold, C Clemens, R Filgas, Dieter H. Hartmann
The Swift/Fermi Grb 080928 From 1 Ev To 150 Kev, A. Rossi, S. Schulze, S. Klose, D. A. Kann, A. Rau, H. A. Krimm, G. Jóhannesson, A. Panaitescu, F. Yuan, P Ferrero, T Krühler, J Greiner, P Schady, S B. Pandey, L Amati, P.M.F. Afonso, C W. Akerlof, L A. Arnold, C Clemens, R Filgas, Dieter H. Hartmann
Publications
We present the results of a comprehensive study of the gamma-ray burst 080928 and of its afterglow. GRB 080928 was a long burst detected by Swift/BAT and Fermi/GBM. It is one of the exceptional cases where optical emission had already been detected when the GRB itself was still radiating in the gamma-ray band. For nearly 100 s simultaneous optical, X-ray and gamma-ray data provide a coverage of the spectral energy distribution of the transient source from about 1 eV to 150 keV. In particular, we show that the SED during the main prompt emission phase agrees with synchrotron radiation. We …
Transit System Evaluation Process: From Planning To Realization, K Bartman, Jennifer Ogle, Mashrur Chowdhury, Anne Dunning
Transit System Evaluation Process: From Planning To Realization, K Bartman, Jennifer Ogle, Mashrur Chowdhury, Anne Dunning
Publications
Many frameworks exist to help transit agencies plan, operate, and monitor the performance of transit in rural and urban communities. No framework integrates these three critical business practices into one coherent and flexible framework useful to rural and small-sized cities. The primary objective of this research was to integrate planning, operations, and performance measurement activities into a framework designed to evaluate transit in the context of overall mobility. By combining planning, evaluation, and performance monitoring processes, a succinct framework useful to transit agencies and planners was created. In addition to city entities, colleges and universities operating or contracting transit systems …
Observations On Braided Thin Wire Nucleate Boiling In Microgravity, Justin P. Koeln, Jeffrey C. Boulware, Heng Ban, Jr Dennison
Observations On Braided Thin Wire Nucleate Boiling In Microgravity, Justin P. Koeln, Jeffrey C. Boulware, Heng Ban, Jr Dennison
Publications
A microgravity experiment was conducted on the Space Shuttle Endeavor (STS-108) to observe sustained nucleate boiling of water. Subcooled water was boiled with a single strand and a braid of three 0.16. mm diameter and 80. mm long Nichrome resistive wires. A CCD video camera recorded the experiment while six thermistors recorded the temperature of the fluid at various distances from the heating element. This paper reports experimental results in observations, measurements, and data analysis. Bubble explosions were found to take place shortly after the onset of boiling for both the single and braid of wires. The explosion may produce …
Adventures In The Enormous: A 1.8 Million Clone Bac Library For The 21.7 Gb Genome Of Loblolly Pine, Zenaida Magbanua, Seval Ozkan, Benjamin Bartlett, Philippe Chouvarine, Christopher Saski, Aaron Siston, Richard Cronn, C Dana Nelson, Daniel Peterson
Adventures In The Enormous: A 1.8 Million Clone Bac Library For The 21.7 Gb Genome Of Loblolly Pine, Zenaida Magbanua, Seval Ozkan, Benjamin Bartlett, Philippe Chouvarine, Christopher Saski, Aaron Siston, Richard Cronn, C Dana Nelson, Daniel Peterson
Publications
Loblolly pine (LP; Pinus taeda L.) is the most economically important tree in the U.S. and a cornerstone species in southeastern forests. However, genomics research on LP and other conifers has lagged behind studies on flowering plants due, in part, to the large size of conifer genomes. As a means to accelerate conifer genome research, we constructed a BAC library for the LP genotype 7-56. The LP BAC library consists of 1,824,768 individually-archived clones making it the largest single BAC library constructed to date, has a mean insert size of 96 kb, and affords 7.6X coverage of the 21.7 Gb …
Deciphering The Story Of The Musuem, Eoin Kilfeather
Deciphering The Story Of The Musuem, Eoin Kilfeather
Publications
No abstract provided.
Forensic Analysis Of Plug Computers, Scott Conrad, Greg Dorn, Philip Craiger
Forensic Analysis Of Plug Computers, Scott Conrad, Greg Dorn, Philip Craiger
Publications
A plug computer is essentially a cross between an embedded computer and a traditional computer, and with many of the same capabilities. However, the architecture of a plug computer makes it difficult to apply commonly used digital forensic methods. This paper describes methods for extracting and analyzing digital evidence from plug computers. Two popular plug computer models are examined, the SheevaPlug and the Pogoplug.
Solitary Waves, Periodic And Elliptic Solutions To The Benjamin, Bona & Mahony (Bbm) Equation Modified By Viscosity, S.C. Mancas, Harihar Khanal, Shahrdad G. Sajjadi
Solitary Waves, Periodic And Elliptic Solutions To The Benjamin, Bona & Mahony (Bbm) Equation Modified By Viscosity, S.C. Mancas, Harihar Khanal, Shahrdad G. Sajjadi
Publications
We introduce spatiotemporal solitons of the two-dimensional complex Ginzburg-Landau equation (2D CCQGLE) with cubic and quintic nonlinearities in which asymmetry between space-time variables is included. The 2D CCQGLE is solved by a powerful Fourier spectral method, i.e., a Fourier spatial discretization and an explicit scheme for time differencing. Varying the system’s parameters, and using different initial conditions, numerical simulations reveal 2D solitons in the form of stationary, pulsating and exploding solitons which possess very distinctive properties. For certain region of parameters, we have also found stable coherent structures in the form of spinning (vortex) solitons which exist as a result …
The Variable Determinacy Thesis, Harry Surden
The Variable Determinacy Thesis, Harry Surden
Publications
This Article proposes a novel technique for characterizing the relative determinacy of legal decision-making. I begin with the observation that the determinacy of legal outcomes varies from context to context within the law. To augment this intuition, I develop a theoretical model of determinate legal decision-making. This model aims to capture the essential features that are typically associated with the concept of legal determinacy. I then argue that we can use such an idealized model as a standard for expressing the relative determinacy or indeterminacy of decision-making in actual, observed legal contexts. From a legal theory standpoint, this approach - …
Play Education Video Games On Their Terms, Wendi M. Kappers
Play Education Video Games On Their Terms, Wendi M. Kappers
Publications
It is imperative when utilizing educational video games in K-12 classrooms that student preferences with regard to game play, purpose, and design be considered in order to maximize game play efficiency for learning. As Web 2.0 content infiltrates our educational medium, student customization is key. This manuscript intends to share customization requests gleaned during an 18-week experimental study examining educational video game effects upon 7th graders enrolled in Mathematics and Mathematics 2 courses.