Mazzaro G.J.,Citadel |
Martone A.F.,U.S. Army |
McNamara D.M.,U.S. Army
IEEE Transactions on Aerospace and Electronic Systems | Year: 2014
Multitone harmonic radar is presented. The radar transmits multiple closely-spaced tones and receives nonlinear mixing products as well as harmonics. Harmonic and multitone responses are recorded from commercially-available RF devices. An original method for discriminating between electronic targets, by receiving at least two nonlinear mixing products near a harmonic, is presented. Target detection is demonstrated experimentally for a novel pulsed two-tone harmonic radar. Experimental results are extrapolated to estimate radar design parameters to achieve a realistic standoff range. © 1965-2011 IEEE.
De Steven D.,U.S. Department of Agriculture |
Wetlands | Year: 2012
The Wetlands Reserve Program (WRP) restores converted or degraded wetlands on private working lands; however, the nature and outcomes of such efforts are undocumented in the Southeastern U.S. Identification of wetland types is needed to assess the program's conservation benefits, because ecological functions differ with hydrogeomorphic (HGM) type. We reviewed >100 WRP projects across the Southeast Piedmont-Coastal Plain to characterize their wetland types and to evaluate whether restoration practices favored original or modified functions. The projects encompassed four HGM types and diverse prerestoration conditions. Nearly half were converted wetlands retired from active agriculture; the remainder were either drained vegetated wetlands or forested bottomlands degraded by timber harvest. Hydrology-repair practices varied by wetland type and prior condition, with differing functional implications. Depressions and flats typically were restored, whereas low-order riparian sites and prior-agriculture floodplains were often modified to enhance water retention. Timber-harvested floodplains were restored by removing barriers to water flow and biotic connectivity. Vegetation restoration was generally passive, but tree planting was frequent on prior-agriculture sites. Field surveys suggested that most projects had positive indicators of wetland hydrology, vegetation, and faunal use. The variety of Southeastern WRP wetlands has implications for ecosystem services at local and landscape scales. © US Government 2012.
Frick M.G.,Friends of the National Zoo |
Zardus J.D.,Citadel |
Lazo-Wasem E.A.,Yale University
Bulletin of the Peabody Museum of Natural History | Year: 2010
A new species of the commensal barnacle genus Stomatolepas has been collected from leatherback turtles in the southern Atlantic Ocean. It is described here as S. pilsbryi n. sp. and compared to its congeners S. elegans (Costa, 1838) and S. praegustator Pilsbry, 1910. A neotype is also designated for S. elegans. © 2010 Peabody Museum of Natural History.
Applied Physics B: Lasers and Optics | Year: 2013
We present designs for multipole ion traps based on a set of planar, annular, concentric electrodes which require only rf potentials to confine ions. We illustrate the desirable properties of the traps by considering a few simple cases of confined ions. We predict that mm-scale surface traps may have trap depths as high as tens of electron volts when parameters of a magnitude common in the field are chosen. Under similar conditions, micromotion amplitudes in a 2D ion crystal as low as tens of nanometers could be realized. Several example traps are studied, and the scaling of those properties with voltage, frequency, and trap scale, for small numbers of ions, is derived. Applications of these traps include quantum information science, frequency metrology, and cold ion-atom collisions. © 2013 Springer-Verlag Berlin Heidelberg.
Journal of Insect Physiology | Year: 2014
The polyembryonic wasp Copidosoma floridanum produces two larval castes, soldiers and reproductives, during development within its caterpillar host. Primary structures were determined for 6 odorant-binding protein (OBP) gene family members in Copidosoma and then analyzed alongside two formerly sequenced OBP genes from this wasp. The genes were examined for caste-bias in expression patterns using reverse transcription-polymerase chain reaction (RT-PCR) and in situ expression studies. Six of the 8 genes show a clear bias in gene expression towards one or the other larval caste. Of the 3 distinct in situ probe hybridization patterns observed in this study, none lie in tissues with clear chemosensory functions. Two of the patterns suggest the majority of the Copidosoma OBP gene family members discovered thus far come into contact with host hemolymph. Most of these OBPs are expressed exclusively in the serosal membrane encompassing each of the reproductive larvae. The absence of expression in the membrane surrounding soldier larvae strongly suggests these OBPs are performing caste-specific functions in the host. © 2013 Elsevier Ltd.
Southeastern Naturalist | Year: 2010
Laurel Wilt is caused by a recently identified fungal pathogen infecting plants in the Lauraceae. Laurel Wilt is transmitted by Xyleborus glabratus (Redbay Ambrosia Beetle), which was recently introduced to the southeastern United States from Asia. As the insect expands its range in the US, so too has the disease. A query of the NatureServe Explorer database was used to identify the conservation status of native plant species and recognized plant communities that may be affected by Laurel Wilt. Laurel Wilt affects at least nine plant species, and all fifteen species in the Lauraceae currently found in North America may ultimately prove to be hosts for the disease. Four of the twelve native lauraceous species had been identified as vulnerable to extirpation or extinction, prior to the introduction of Laurel Wilt. There are 55 plant communities in the US and Canada that have a member of the Lauraceae as a dominant or diagnostic species. The majority of these plant communities have been identified as vulnerable. Agricultural industries that are based upon Persea americana (Avocado) cultivation in Florida and California are threatened by Laurel Wilt as well. Given the potential impact of this disease on lauraceous plants and their associated communities, these taxa and assemblages should be monitored for the arrival and impact of Laurel Wilt.
ASEE Annual Conference and Exposition, Conference Proceedings | Year: 2015
Gifted Fourth and Fifth Grade students from Richland School District 2 conduct a field study (Active Learning Experiences in Resourceful Thinking, ALERT) at The Citadel every other year. The focus is for their students from 19 elementary schools who are part of a district-wide gifted and talented pullout program to experience STEM disciplines in a college environment to not only inform the future mathematics and science classes they have and will have, but also to begin the discussion on the importance of going to college and follow-on careers, especially in STEM disciplines. The School of Engineering and Science and Mathematics work together to provide four distinct one hour blocks of activities and interaction with discussion of how devices work (theory). The key focus is engineering and each student group of 25 students see two one hour blocks on engineering (civil and electrical). The students complete a reflection on the daylong experience and the teachers incorporate pictures of the activities the students experienced into future mathematics and science lesson plans to complete the learning circle by tying mathematics/science problems to their experiences. Many of these students decide to apply for academic magnet middle schools focused on STEM based on the success of the 4th and 5th grade integrated lesson/field trip curriculum to The Citadel. Assessment of curriculum changes based on the field trip, student reflective essays, and future attendance at middle and high school STEM magnets will demonstrate the importance of collaboration between universities and elementary and middle school programs (especially STEM focused programs) on engagement with STEM disciplines in the future. © American Society for Engineering Education, 2015.
Twyman K.,Saint Louis University |
Saylor C.,Citadel |
Taylor L.A.,Citadel |
Cyberpsychology, Behavior, and Social Networking | Year: 2010
Although characteristics of traditional bullying participants have been identified and studied for years, research on cyberbullying is limited. The purpose of this study is to expand the literature on cyberbullying with a particular focus on the relationships among cyberbullying characteristics, typical social activities, and more traditional forms of bullying. The typical activities and experiences with traditional bullying and cyberbullying of 52 children ages 11 to 17 were compared to those of 52 matched controls. Children exposed to cyberbullying, whether as a cyberbully, cybervictim, or both (bully/victim), spent more time on computer-based social activities. Nearly two thirds of cyberbully/victims were also traditional bully/victims. While preliminary, results suggest that efforts to prevent cyberbullying may need to focus on patterns of Internet use, amount and type of social activities, and exposure to traditional bullying as risk factors for engaging in cyberbullying. © Mary Ann Liebert, Inc. 2010.
2015 IEEE Signal Processing and Signal Processing Education Workshop, SP/SPE 2015 | Year: 2015
This paper describes an acoustical investigation on Thai speech segmentation using a combination of average level crossing rate (ALCR) and root-mean-square (RMS) energy. Simple and easy to compute, ALCR information alone was successfully used in an automatic speech segmentation system for English. However, ALCR has never been applied to Thai. As a result, the objective of the study is to apply ALCR information to ascertain its usefulness in detecting significant temporal changes in continuous Thai Speech. An experiment was conducted on a small speech corpus containing 21 sentences. Preliminary results suggest that ALCR and RMS energy can be used to detect the phonetic boundary between obstruent initial consonant and preceding/following vowel. In addition, it can also be used to detect boundary between final consonant of the preceding syllable and initial consonant of the following syllable except for the case involving two successive non-identical nasals. The overall accuracy is around 81% for data from four speakers. © 2015 IEEE.
Conference Proceedings - IEEE SOUTHEASTCON | Year: 2015
This paper investigates the application of state feedback (SF) design methods to implement a Proportional, Integral, Derivative (PID) controller. A comparison is made with the Ziegler-Nichols tuning method. Two design examples are conducted to validate the procedure. © 2015 IEEE.