Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Physical Sciences and Mathematics (1378)
- Astrophysics and Astronomy (533)
- Engineering (426)
- Education (388)
- Oceanography and Atmospheric Sciences and Meteorology (261)
-
- Atmospheric Sciences (213)
- Stars, Interstellar Medium and the Galaxy (184)
- Computer Sciences (172)
- Social and Behavioral Sciences (151)
- Physics (149)
- Higher Education (134)
- Science and Mathematics Education (134)
- Law (101)
- Environmental Sciences (84)
- Mathematics (84)
- Applied Mathematics (81)
- Cosmology, Relativity, and Gravity (80)
- Engineering Education (76)
- Civil and Environmental Engineering (75)
- Medicine and Health Sciences (67)
- Electrical and Computer Engineering (66)
- Computer Engineering (65)
- Online and Distance Education (63)
- Public Affairs, Public Policy and Public Administration (62)
- Aerospace Engineering (60)
- Life Sciences (58)
- Meteorology (57)
- Arts and Humanities (54)
- Aviation (53)
- Educational Assessment, Evaluation, and Research (53)
- Institution
-
- Embry-Riddle Aeronautical University (1289)
- Clemson University (528)
- Utah State University (139)
- University of Colorado Law School (96)
- Southern Illinois University Carbondale (65)
-
- University of South Carolina (54)
- University of Nebraska at Omaha (47)
- Munster Technological University (42)
- Louisiana State University (29)
- University of Southern Maine (28)
- California Polytechnic State University, San Luis Obispo (16)
- Mississippi State University (16)
- UAlaska System (13)
- Technological University Dublin (8)
- Southern Methodist University (4)
- Center for the Blue Economy (3)
- University of Mississippi (3)
- Rockefeller University (2)
- University of New Mexico (2)
- Ursinus College (2)
- Andrews University (1)
- University at Albany, State University of New York (1)
- University of Memphis (1)
- Keyword
-
- White dwarfs (68)
- Astronomy (54)
- Technology (53)
- Science (49)
- Astronautics (45)
-
- Gravity waves (42)
- Higher education (31)
- STEM (31)
- Gravitational waves (30)
- Climate change (22)
- Stars: evolution (22)
- Online learning (21)
- Waves and tides (21)
- Education (20)
- Engineering (20)
- Acoustic-gravity waves (19)
- Airglow and aurora (19)
- Artificial intelligence (17)
- Assessment (17)
- Ionosphere (17)
- Kelvin-Helmholtz instability (17)
- Nebraska (17)
- South Carolina (17)
- Cybersecurity (16)
- Circumstellar matter (15)
- Omaha (15)
- Relativity (14)
- Stars: abundances (14)
- Data Innovation Project (13)
- Gravitation (13)
- Publication Year
- Publication Type
- File Type
Articles 811 - 840 of 2389
Full-Text Articles in Entire DC Network
Cardiorespiratory Fitness Is Positively Associated With Waist To Height Ratio And School Socio Economic Status In Irish Primary School Aged Children, M. O'Leary, E. Rush, Seán Lacey, Con Burns, Tara Coppinger
Cardiorespiratory Fitness Is Positively Associated With Waist To Height Ratio And School Socio Economic Status In Irish Primary School Aged Children, M. O'Leary, E. Rush, Seán Lacey, Con Burns, Tara Coppinger
Publications
Background; The purpose of this paper is to examine any association between cardiorespiratory fitness (CRF) and markers of health among 6 and 10 year old Irish children. Methods; A total of 917 children (6 year olds, N=459; 10 year olds, N=458) from 11 primary schools in Cork (Ireland) participated. Body composition, blood pressure (BP), CRF (550-metre distance run) and school socio-economic status (SES) were assessed. Children were classified as low or high fitness based on run-time standard deviation scores (SDS). Physical activity (PA) determined over 1 week by accelerometry was collected from a sub sample of 700 children (76.3%). Results; …
A Taxonomy Framework For Maritime Cybersecurity: A Demonstration Using The Automatic Identification System, G. C. Kessler, J. P. Craiger, J. C. Haass
A Taxonomy Framework For Maritime Cybersecurity: A Demonstration Using The Automatic Identification System, G. C. Kessler, J. P. Craiger, J. C. Haass
Publications
The maritime transportation system is increasingly a target of cyber attacks. This paper describes a taxonomy that supports the creation of adversarial cyber models, risk mitigation, and resiliency plans as applied to the maritime industry, using the Automatic Identification System as a specific illustration of the approach. This method has already been applied to the aviation sector; retooling it for a maritime example demonstrates its broad applicability to the transportation sector, in general.
Dust Production And Depletion In Evolved Planetary Systems, J. Farihi, Ted Von Hippel, Rik Van Lieshout, P.W. Cauley, Erik Dennihy, Et Al.
Dust Production And Depletion In Evolved Planetary Systems, J. Farihi, Ted Von Hippel, Rik Van Lieshout, P.W. Cauley, Erik Dennihy, Et Al.
Publications
The infrared dust emission from the white dwarf GD 56 is found to rise and fall by 20 per cent peak-to-peak over 11.2 yr, and is consistent with ongoing dust production and depletion. It is hypothesized that the dust is produced via collisions associated with an evolving dust disc, temporarily increasing the emitting surface of warm debris, and is subsequently destroyed or assimilated within a few years. The variations are consistent with debris that does not change temperature, indicating that dust is produced and depleted within a fixed range of orbital radii. Gas produced in collisions may rapidly re-condense onto …
Ultralow Frequency Electrodynamics Of Magnetosphere-Ionosphere Interactions Near The Plasmapause During Substorms, Anatoly V. Streltsov, Evgeny V. Mishin
Ultralow Frequency Electrodynamics Of Magnetosphere-Ionosphere Interactions Near The Plasmapause During Substorms, Anatoly V. Streltsov, Evgeny V. Mishin
Publications
Ultra low frequency (ULF) electromagnetic waves have been regularly observed by the CRRES, Cluster, and Van Allen Probes satellites near the plasmapause during substorms. Frequently, the small-scale waves are detected together with a large-scale quasi-stationary electric field collocating with mesoscale plasma flows penetrating into the plasmasphere. These observations suggest that the plasmapause plays an important role in the conversion of the kinetic energy of energetic particles moving toward the Earth from the reconnection site in the magnetotail into a large-scale electric field. The field penetrates along the magnetic field into the ionosphere and generates small-scale, shear Alfvén waves and field-aligned …
Three-Dimensional Hybrid Simulation Of Viscous-Like Processes At Saturn's Magnetosphere Boundary, P. A. Delamere, B. Burkholder, X. Ma
Three-Dimensional Hybrid Simulation Of Viscous-Like Processes At Saturn's Magnetosphere Boundary, P. A. Delamere, B. Burkholder, X. Ma
Publications
Saturn's magnetosheath flows exhibit significant dawn/dusk asymmetry. The dawnside flows are reduced from expectation, suggesting significant momentum transport through the magnetopause boundary where the flow shear is maximized. It has been suggested that the solar wind interaction with the giant magnetospheres is, in fact, dominated by a viscous‐like interaction governed by the Kelvin‐Helmholtz instability. In three dimensions, the Kelvin‐Helmholtz instability can generate small‐scale and intermittent magnetic reconnection due, in part, to a twisted magnetic field topology. The net result is a field line threading of the magnetopause boundary and the generation of Maxwell shear stresses. Here we present three‐dimensional hybrid …
On The Short-Term Variability Of Turbulence And Temperature In The Winter Mesosphere, Gerald A. Lehmacher, Miguel F. Larsen, Richard L. Collins, Aroh Barjatya, Boris Strelnikov
On The Short-Term Variability Of Turbulence And Temperature In The Winter Mesosphere, Gerald A. Lehmacher, Miguel F. Larsen, Richard L. Collins, Aroh Barjatya, Boris Strelnikov
Publications
Four mesosphere–lower thermosphere temperature and turbulence profiles were obtained in situ within ∼30 min and over an area of about 100 by 100 km during a sounding rocket experiment conducted on 26 January 2015 at Poker Flat Research Range in Alaska. In this paper we examine the spatial and temporal variability of mesospheric turbulence in relationship to the static stability of the background atmosphere. Using active payload attitude control, neutral density fluctuations, a tracer for turbulence, were observed with very little interference from the payload spin motion, and with high precision (%) at sub-meter resolution. The large-scale vertical temperature structure …
Full Field Computing For Elastic Pulse Dispersion In Inhomogeneous Bars, A. Berezovski, R. Kolman, M. Berezovski, D. Gabriel, V. Adamek
Full Field Computing For Elastic Pulse Dispersion In Inhomogeneous Bars, A. Berezovski, R. Kolman, M. Berezovski, D. Gabriel, V. Adamek
Publications
In the paper, the finite element method and the finite volume method are used in parallel for the simulation of a pulse propagation in periodically layered composites beyond the validity of homogenization methods. The direct numerical integration of a pulse propagation demonstrates dispersion effects and dynamic stress redistribution in physical space on example of a one-dimensional layered bar. Results of numerical simulations are compared with analytical solution constructed specifically for the considered problem. Analytical solution as well as numerical computations show the strong influence of the composition of constituents on the dispersion of a pulse in a heterogeneous bar and …
Bayesian Hierarchical Modelling Of Initial-Final Mass Relations Across Star Clusters, Shijing Si, David A. Van Dyk, Ted Von Hippel, Elliot Robinson, Elizabeth Jeffery, David C. Stenning
Bayesian Hierarchical Modelling Of Initial-Final Mass Relations Across Star Clusters, Shijing Si, David A. Van Dyk, Ted Von Hippel, Elliot Robinson, Elizabeth Jeffery, David C. Stenning
Publications
The initial-final mass relation (IFMR) of white dwarfs (WDs) plays an important role in stellar evolution. To derive precise estimates of IFMRs and explore how they may vary among star clusters, we propose a Bayesian hierarchical model that pools photometric data from multiple star clusters. After performing a simulation study to show the benefits of the Bayesian hierarchical model, we apply this model to five star clusters: the Hyades, M67, NGC 188, NGC 2168, and NGC 2477, leading to reasonable and consistent estimates of IFMRs for these clusters. We illustrate how a cluster-specific analysis of NGC 188 using its own …
Rapid Screening Of Ellagitannins In Natural Sources Via Targeted Reporter Ion Triggered Tandem Mass Spectrometry, Jeremiah J. Bowers, Harsha P. Gunawardena, Anaëlle Cornu, Ashwini S. Narvekar, Antoine Richieu, Denis Deffieux, Stéphane Quideau, Nishanth Tharayil
Rapid Screening Of Ellagitannins In Natural Sources Via Targeted Reporter Ion Triggered Tandem Mass Spectrometry, Jeremiah J. Bowers, Harsha P. Gunawardena, Anaëlle Cornu, Ashwini S. Narvekar, Antoine Richieu, Denis Deffieux, Stéphane Quideau, Nishanth Tharayil
Publications
Complex biomolecules present in their natural sources have been difficult to analyze using traditional analytical approaches. Ultrahigh-performance liquid chromatography (UHPLC-MS/MS) methods have the potential to enhance the discovery of a less well characterized and challenging class of biomolecules in plants, the ellagitannins. We present an approach that allows for the screening of ellagitannins by employing higher energy collision dissociation (HCD) to generate reporter ions for classification and collision-induced dissociation (CID) to generate unique fragmentation spectra for isomeric variants of previously unreported species. Ellagitannin anions efficiently form three characteristic reporter ions after HCD fragmentation that allows for the classification of unknown …
Aurel Stein And The Kiplings: Silk Road Pathways Of Converging And Reciprocal Inspiration, Geoffrey Kain
Aurel Stein And The Kiplings: Silk Road Pathways Of Converging And Reciprocal Inspiration, Geoffrey Kain
Publications
Biographies of the renowned linguistic scholar and archaeological explorer Sir Marc Aurel Stein (1862–1943) inevitably yet briefly refer to the role played by John Lockwood Kipling (1837–1911), as curator of the Lahore Museum—with its extensive collection of ancient Gandharan Greco-Buddhist sculpture—in exciting Stein’s interests in and theories of what likely lay buried under the sands of the Taklamakan Desert. A more insistent focus on the coalescing influences in the Stein-Kipling relationship, including a subsequent line of evident inspiration from Stein to the internationally famed author and Nobel laureate Rudyard Kipling (Lockwood’s son; 1865–1936), helps to synthesize some of the highlights …
Breaking Down Traditional Classroom Walls And Studying Spacesuits Abroad, Ryan L. Kobrick, Jessica Mckee Ph.D., Sue A. Macchiarella, Angelica Gould
Breaking Down Traditional Classroom Walls And Studying Spacesuits Abroad, Ryan L. Kobrick, Jessica Mckee Ph.D., Sue A. Macchiarella, Angelica Gould
Publications
The spacesuit curriculum under development by the Spacesuit Utilization of Innovative Technology Laboratory (S.U.I.T. Lab) in the Spaceflight Operations program of the Applied Aviation Sciences Department at Embry-Riddle Aeronautical University has the unique challenge of educating non-engineering students about extremely technical space systems, highlighted by spacesuits. CSO 399: “Spacesuits and Human Spaceflight Operations” course, taught in Greece each summer, introduces students to human spaceflight topics. This unique offering takes advantage of the clear water visibility in the Aegean Sea with practical underwater demonstrations of space operations. Students live in confined quarters on a sailboat for two weeks to simulate operations …
Bayesian Analysis Of Two Stellar Populations In Galactic Globular Clusters I: Statistical And Computational Methods, David Stenning, Ted Von Hippel, Rachel Wagner-Kaiser, Elliot Robinson, David Van Dyk, Ata Sarajedini, Nathan Stein
Bayesian Analysis Of Two Stellar Populations In Galactic Globular Clusters I: Statistical And Computational Methods, David Stenning, Ted Von Hippel, Rachel Wagner-Kaiser, Elliot Robinson, David Van Dyk, Ata Sarajedini, Nathan Stein
Publications
We develop a Bayesian model for globular clusters composed of multiple stellar populations, extend- ing earlier statistical models for open clusters composed of simple (single) stellar populations (e.g., van Dyk et al. 2009; Stein et al. 2013). Specifically, we model globular clusters with two populations that differ in helium abundance. Our model assumes a hierarchical structuring of the parameters in which physical properties|age, metallicity, helium abundance, distance, absorption, and initial mass|are common to (i) the cluster as a whole or to (ii) individual populations within a cluster, or are unique to (iii) individual stars. An adaptive Markov chain Monte Carlo …
Mountain-Wave Propagation Under Transient Tropospheric Forcing: A Deepwave Case Study, Tanja C. Portele, Andreas Dörnbrack, Johannes S. Wagner, Sonja Gisinger, Benedikt Ehard, Pierre-Dominique Pautet, Markus Rapp
Mountain-Wave Propagation Under Transient Tropospheric Forcing: A Deepwave Case Study, Tanja C. Portele, Andreas Dörnbrack, Johannes S. Wagner, Sonja Gisinger, Benedikt Ehard, Pierre-Dominique Pautet, Markus Rapp
Publications
The impact of transient tropospheric forcing on the deep vertical mountain-wave propagation is investigated by a unique combination of in situ and remote sensing observations and numerical modeling. The temporal evolution of the upstream low-level wind follows approximately a cos2 shape and was controlled by a migrating trough and connected fronts. Our case study reveals the importance of the time-varying propagation conditions in the upper troposphere and lower stratosphere (UTLS). Upper-tropospheric stability, the wind profile, and the tropopause strength affected the observed and simulated wave response in the UTLS. Leg-integrated along-track momentum fluxes (-MFtrack) and amplitudes of …
Kelvin-Helmholtz Instability: Lessons Learned And Ways Forward, A. Masson, K. Nykyri
Kelvin-Helmholtz Instability: Lessons Learned And Ways Forward, A. Masson, K. Nykyri
Publications
The Kelvin–Helmholtz instability (KHI) is a ubiquitous phenomenon across the Universe, observed from 500 m deep in the oceans on Earth to the Orion molecular cloud. Over the past two decades, several space missions have enabled a leap forward in our understanding of this phenomenon at the Earth’s magnetopause. Key results obtained by these missions are first presented, with a special emphasis on Cluster and THEMIS. In particular, as an ideal instability, the KHI was not expected to produce mass transport. Simulations, later confirmed by spacecraft observations, indicate that plasma transport in Kelvin–Helmholtz (KH) vortices can arise during non-linear stage …
Book Review: Spectral Atlas For Amateur Astronomers: A Guide To The Spectra Of Astronomical Objects And Terrestrial Light Sources, T. D. Oswalt
Publications
This document is Dr. Oswalt’s review of Spectral Atlas for Amateur Astronomers: A Guide to the Spectra of Astronomical Objects and Terrestrial Light Sources by Richard Walker. Cambridge 2017, 277 p bibl index, 9781107165908 $89.99, 9781316731048 $72.00
Motivating Students To Learn A Programming Language: Applying A Second Language Acquisition Approach In A Blended Learning Environment, Lulu Sun, Christina Frederick, Caroline Liron, Li Ding, Lei Gu, Andrew Calvin Griggs Ii, Paula Sanjuan Espejo
Motivating Students To Learn A Programming Language: Applying A Second Language Acquisition Approach In A Blended Learning Environment, Lulu Sun, Christina Frederick, Caroline Liron, Li Ding, Lei Gu, Andrew Calvin Griggs Ii, Paula Sanjuan Espejo
Publications
Learning a programming language typically involves acquisition of new vocabulary, punctuation, and grammatical structures to communicate with a computer. In other words, learning a programming language is like learning a human language. A recent study showed that programmers use language regions of the brain when understanding source code and found little activation in other regions of the brain devoted to mathematical thinking. Even though programming code involved mathematical operations, conditionals, and loop iterations, researchers found that programming had less in common with mathematics and more in common with human language.
Multi-Task Learning Framework For Mining Crowd Intelligence Towards Clinical Treatment, Shweta Yadav, Asif Ekbal, Sriparna Saha, Pushpak Bhattacharyya, Amit Sheth
Multi-Task Learning Framework For Mining Crowd Intelligence Towards Clinical Treatment, Shweta Yadav, Asif Ekbal, Sriparna Saha, Pushpak Bhattacharyya, Amit Sheth
Publications
In recent past, social media has emerged as an active platform in the context of healthcare and medicine. In this paper, we present a study where medical user’s opinions on health-related issues are analyzed to capture the medical sentiment at a blog level. The medical sentiments can be studied in various facets such as medical condition, treatment, and medication that characterize the overall health status of the user. Considering these facets, we treat analysis of this information as a multi-task classification problem. In this paper, we adopt a novel adversarial learning approach for our multi-task learning framework to learn the …
Institutional Barriers To Black And Latino Male Collegians’ Success In Engineering And Related Stem Fields, Leroy Long Iii, Trevion S. Henderson, Michael Steven Williams Dr,
Institutional Barriers To Black And Latino Male Collegians’ Success In Engineering And Related Stem Fields, Leroy Long Iii, Trevion S. Henderson, Michael Steven Williams Dr,
Publications
Diverse people and perspectives are needed to spur innovation and tackle societal problems. A wealth of untapped intellectual and economic potential exists among historically underrepresented racial/ethnic groups – including Blacks and Latinos – who have not had equitable access to engineering and related STEM fields. For Blacks and Latinos who are accepted into engineering and related STEM fields, they face a number of barriers to their success which lead to low retention and graduation rates. In historically male-dominated fields such as engineering and related STEM disciplines, Black and Latino men have remained underrepresented at the student and faculty ranks. To …
Orbital Characteristics Of The Subdwarf-B And F V Star Binary Ec 20117-4014 (=V4640 Sgr), T. Otani, T. D. Oswalt, A. E. Lynas-Gray, D. Kilkenny, C. Koen, M. Amaral, R. Jordan
Orbital Characteristics Of The Subdwarf-B And F V Star Binary Ec 20117-4014 (=V4640 Sgr), T. Otani, T. D. Oswalt, A. E. Lynas-Gray, D. Kilkenny, C. Koen, M. Amaral, R. Jordan
Publications
Among the competing evolution theories for subdwarf-B (sdB) stars is the binary evolution scenario. EC 20117-4014 (=V4640 Sgr) is a spectroscopic binary system consisting of a pulsating sdB star and a late F main-sequence companion; however, the period and the orbit semimajor axes have not been precisely determined. This paper presents orbital characteristics of the EC 20117-4014 binary system using 20 years of photometric data. Periodic observed minus calculated (O–C) variations were detected in the two highest-amplitude pulsations identified in the EC 20117-4014 power spectrum, indicating the binary system's precise orbital period (P = 792.3 …
Us Airline Stock Market Performance And Change In Investor Behavior Over The Great Recession Of 2008, Rebecca Wood, Jayendra Gokhale
Us Airline Stock Market Performance And Change In Investor Behavior Over The Great Recession Of 2008, Rebecca Wood, Jayendra Gokhale
Publications
We study the relationship of West Texas Intermediate (WTI) crude oil returns and the stock market returns with the US airline stocks before, during and after the 2008 financial crisis. We confirm the positive relationship of the airline stock returns with the overall market and the negative relationship with WTI. However, we find that the crisis led to a structural change in this relationship. Our results differ for low-cost airlines which absorb the oil price shock better as compared to legacy airlines. We also find that there is a difference in the relationship between the airline stock returns and WTI …
Patient-Specific Multiscale Computational Fluid Dynamics Assessment Of Embolization Rates In The Hybrid Norwood: Effects Of Size And Placement Of The Reverse Blalock–Taussig Shunt, Ray Prather, John Seligson, Marcus Ni, Eduardo Divo, Alain J. Kassab, William Decampli
Patient-Specific Multiscale Computational Fluid Dynamics Assessment Of Embolization Rates In The Hybrid Norwood: Effects Of Size And Placement Of The Reverse Blalock–Taussig Shunt, Ray Prather, John Seligson, Marcus Ni, Eduardo Divo, Alain J. Kassab, William Decampli
Publications
The hybrid Norwood operation is performed to treat hypoplastic left heart syndrome. Distal arch obstruction may compromise flow to the brain. In a variant of this procedure, a synthetic graft (reverse Blalock–Taussig shunt) is placed between the pulmonary trunk and innominate artery to improve upper torso blood flow. Thrombi originating in the graft may embolize to the brain. In this study, we used computational fluid dynamics and particle tracking to investigate the patterns of particle embolization as a function of the anatomic position of the reverse Blalock–Taussig shunt. The degree of distal arch obstruction and position of particle origin influence …
Seasonal Propagation Characteristics Of Mstids Observed At High Latitudes Over Central Alaska Using The Poker Flat Incoherent Scatter Radar, Michael R. Negale, Michael J. Taylor, M. J. Nicolls, Sharon L. Vadas, Kim Nielsen, Craig J. Heinselman
Seasonal Propagation Characteristics Of Mstids Observed At High Latitudes Over Central Alaska Using The Poker Flat Incoherent Scatter Radar, Michael R. Negale, Michael J. Taylor, M. J. Nicolls, Sharon L. Vadas, Kim Nielsen, Craig J. Heinselman
Publications
Near‐continuous electron density measurements obtained over a ∼3 year period, 2010–2013, using the Poker Flat Incoherent Scatter Radar (PFISR) in central Alaska (69°N, 147°W) have been analyzed to quantify the properties of over 650 high‐latitude medium‐scale traveling ionospheric disturbances (MSTIDs). Our analysis focused on the altitude range 100–300 km encompassing the lower ionosphere/thermosphere and yielded first full seasonal day/night distributions of MSTIDs at high northern latitudes with mean values: horizontal wavelength 446 km, horizontal phase speed 187 m/s, and period 41 min. These year‐round measurements fill an important summertime gap in existing MSTID measurements revealing predominantly eastward wave propagation during …
Thermal Removal Of Carbon Dioxide From The Atmosphere: Energy Requirements And Scaling Issues, Ted Von Hippel
Thermal Removal Of Carbon Dioxide From The Atmosphere: Energy Requirements And Scaling Issues, Ted Von Hippel
Publications
I conduct a systems-level study of direct air capture of CO2 using techniques from thermal physics. This system relies on a combination of an efficient heat exchanger, radiative cooling, and refrigeration, all at industrial scale and operated in environments at low ambient temperatures. While technological developments will be required for such a system to operate efficiently, those developments rest on a long history of refrigeration expertise and technology, and they can be developed and tested at modest scale. I estimate that the energy required to remove CO2 via this approach is comparable to direct air capture by other techniques. The …
A Tale Of Two Airlines: A Comparative Case Study Of High-Road Versus Low-Road Strategies In Customer Service And Reputation Management, Donna L. Roberts, John C. Griffith
A Tale Of Two Airlines: A Comparative Case Study Of High-Road Versus Low-Road Strategies In Customer Service And Reputation Management, Donna L. Roberts, John C. Griffith
Publications
Customer surveys from Ryanair and Southwest Airline passengers were examined to determine their perceptions on customer service for the period of 2012-2013. Southwest Airlines (n=149) was rated significantly higher than Ryanair (n=165) in overall rating (p=.0228), seat comfort (p<.0001), cabin/staff service (p<.0001), and value (p=.0004). Additionally, passengers would recommend Southwest Airlines at a higher rate than Ryanair (p=.0006). Open area comments emphasized that customer service and policies had a large impact on the ratings. Specifically, 53% of Ryanair customers complained about inefficient or unwelcome processes and discourteous or unfriendly service compared to 29% for Southwest Airlines. Ryanair customers complained about check-in procedures, open seating policy, and fees ranging from oversized carry-on bags to fees for printing out boarding passes. The largest area of complaint for Southwest customers concerned how customers were treated for flight delays.
Godunov-Type Upwind Flux Schemes Of The Two-Dimensional Finite Volume Discrete Boltzmann Method, Leitao Chen, Laura Schaefer
Godunov-Type Upwind Flux Schemes Of The Two-Dimensional Finite Volume Discrete Boltzmann Method, Leitao Chen, Laura Schaefer
Publications
A simple unified Godunov-type upwind approach that does not need Riemann solvers for the flux calculation is developed for the finite volume discrete Boltzmann method (FVDBM) on an unstructured cell-centered triangular mesh. With piecewise-constant (PC), piecewise-linear (PL) and piecewise-parabolic (PP) reconstructions, three Godunov-type upwind flux schemes with different orders of accuracy are subsequently derived. After developing both a semi-implicit time marching scheme tailored for the developed flux schemes, and a versatile boundary treatment that is compatible with all of the flux schemes presented in this paper, numerical tests are conducted on spatial accuracy for several single-phase flow problems. Four major …
If At First You Do Not Succeed: The Student Benefits Of Multiple Trials On Summative Assessments, Emily Faulconer, John Griffith, Hayden Frank
If At First You Do Not Succeed: The Student Benefits Of Multiple Trials On Summative Assessments, Emily Faulconer, John Griffith, Hayden Frank
Publications
Learning management systems offer flexibility in assessments. In Canvas, questions can be pulled from pools, customizing each quiz. Canvas also allows unique feedback options. Unique feedback can be programmed for students whether they got the question correct or incorrect. Feedback can even be customized based on which wrong answer was selected. Canvas also allows multiple attempts on assessments, with various options for awarding credit (final attempt, best score, average score, etc.). Combining immediate feedback with multiple attempts is a power - yet underexplored - tool.
From Sensors To Knowledge: The Challenge Of Training The Next Generation Of Data Analysts, Sonya A. H. Mcmullen, Troy Henderson, Scott Burgess, Patti J. Clark, David Ison
From Sensors To Knowledge: The Challenge Of Training The Next Generation Of Data Analysts, Sonya A. H. Mcmullen, Troy Henderson, Scott Burgess, Patti J. Clark, David Ison
Publications
With the advent of commercial-off-the-shelf sensors for use in a variety of applications, integration with analytical software tools, and expansion of available archived datasets, there is a critical need to address the problem of transforming resultant data into comprehensible, actionable information for decision-makers through rigorous analysis. In previous research the participating authors have emphasized that users are often faced with the situation in which they are “drowning in a sea of data” but still “thirsting for knowledge”. The availability of analysis software, tools, and techniques provide opportunities for information collection of ever increasing complexity, but the need for the training …
Algal Biofuel: The Future Of Green Jet Fuel In Air Transportation, Rajee Olaganathan
Algal Biofuel: The Future Of Green Jet Fuel In Air Transportation, Rajee Olaganathan
Publications
The aviation industry is one of the major contributors for the greenhouse gases. As air travel has become inevitable in this modern era, and fossil fuel usage is not sustainable, it is essential to produce renewable fuel and commercialize it to reduce the greenhouse gas emissions. In order to produce an alternate aviation biofuel a lot of industrial and academic collaborations have been developed worldwide. The main concern of this collaborative research is to produce aviation biofuel from renewable resources with low environmental impacts, and which is sustainable at an economically viable price. This mini-review briefly discusses the biotechnological approaches …
Breaking The Habit: The Peculiar 2016 Eruption Of The Unique Recurrent Nova M31n 2008-12a, M. Henze, T. D. Oswalt, M. J. Darnley, S. C. Williams, M. Kato, Et Al.
Breaking The Habit: The Peculiar 2016 Eruption Of The Unique Recurrent Nova M31n 2008-12a, M. Henze, T. D. Oswalt, M. J. Darnley, S. C. Williams, M. Kato, Et Al.
Publications
Since its discovery in 2008, the Andromeda galaxy nova M31N 2008-12a has been observed in eruption every single year. This unprecedented frequency indicates an extreme object, with a massive white dwarf and a high accretion rate, which is the most promising candidate for the single-degenerate progenitor of a Type Ia supernova known to date. The previous three eruptions of M31N 2008-12a have displayed remarkably homogeneous multiwavelength properties: (i) from a faint peak, the optical light curve declined rapidly by two magnitudes in less than two days, (ii) early spectra showed initial high velocities that slowed down significantly within days and …
Error Analysis Of Multi-Needle Langmuir Probe Measurement Technique, Aroh Barjatya, William Merritt
Error Analysis Of Multi-Needle Langmuir Probe Measurement Technique, Aroh Barjatya, William Merritt
Publications
Multi-needle Langmuir probe is a fairly new instrument technique that has been flown on several recent sounding rockets and is slated to fly on a subset of QB50 CubeSat constellation. This paper takes a fundamental look into the data analysis procedures used for this instrument to derive absolute electron density. Our calculations suggest that while the technique remains promising, the current data analysis procedures could easily result in errors of 50% or more. We present a simple data analysis adjustment that can reduce errors by at least a factor of five in typical operation.