The behavioral responses of the fiddler crab, UCA PUGILATOR, to ionizing irradiation

Thesis (M.A.)--Boston University. Note: Page 24 is missing.Many animals, invertebrates as well as vertebrates, have demonstrated an ability to somehow sense ionizing irradiation. This recognition is often apparent by a behavioral response which can be correlated with the x-ray stimulus in some way. The fiddler crab, Uca pugilator, was found to exhibit a behavioral response to ionizing irradiation. When the x-ray machine was turned off, the animal would respond instantaneously by a marked hesitation in its general movement after which it would resume its normal activity. This response suggests the animal's ability to somehow be aware of irradiation. Previous work in this area suggested that the photoreceptors were the primary site of stimulation. The fiddler crab's photoreceptors, located at the ends of protruding eye-stalks, are particularly easily excised. When the eye stalks were rer1oved, the response to x-rays was no longer evident. A parallel series of experiments were done with ltght as the stimulus. With intact eyestalks, the animal showed the same off response, and with the eyestalk removed, the subject exhibited no such response. The possibility of a direct stimulation of nervous structures as well as that of an indirect activation by the x-ray evoked release of bioactive substances is discussed. After considering the sinus gland, which was also removed along with the photoreceptors, as a possible site of x-ray reception, a strong implication that the photoreceptors are the primary locus of x-ray sensitivity in the fiddler crab was stated. The marked dose rate dependency of the animal's response to x-rays was noted, and a possible explanation was suggested

ENCOMPASS: A SAGA based environment for the compositon of programs and specifications, appendix A

ENCOMPASS is an example integrated software engineering environment being constructed by the SAGA project. ENCOMPASS supports the specification, design, construction and maintenance of efficient, validated, and verified programs in a modular programming language. The life cycle paradigm, schema of software configurations, and hierarchical library structure used by ENCOMPASS is presented. In ENCOMPASS, the software life cycle is viewed as a sequence of developments, each of which reuses components from the previous ones. Each development proceeds through the phases planning, requirements definition, validation, design, implementation, and system integration. The components in a software system are modeled as entities which have relationships between them. An entity may have different versions and different views of the same project are allowed. The simple entities supported by ENCOMPASS may be combined into modules which may be collected into projects. ENCOMPASS supports multiple programmers and projects using a hierarchical library system containing a workspace for each programmer; a project library for each project, and a global library common to all projects

Undergraduate Research in a Fully Online Engineering Program: Building the Framework of Support

Undergraduate engineering programs often face low persistence and retention. Females and ethnic minorities are underrepresented and show lower persistence Certain minorities may be less likely to enroll in online programs Lower persistence and retention in online students across disciplines Undergraduate research may increase persistence and retention. Online students likely underrepresented due to access limitation

Breeding Birds in Cedar Stands in the Great Dismal Swamp

The Great Dismal Swamp located in the coastal plain on the Virginia- North Carolina border, has long been recognized as a vegetationally distinctive region with many unusual geological and biological features. Formerly at least twice the currently estimated size of 85,000 hectares (Carter 1979), the Great Dismal Swamp is still shrinking because of a dropping water table caused by more than 200 years of logging, ditching, and other human activities. In 1973, the Union Camp Corporation donated a 19,871-hectare tract located near Suffolk, Virginia. to The Nature Conservancy, which transferred the land to the U.S. Fish and Wildlife Service. This parcel, all in Virginia and including the 1255-hectare Lake Drummond, became the core of the Great Dismal Swamp National Wildlife Refuge (hereafter, G.D.S.N.W.R.), established in 1974. The G.D.S.N.W.R. is still growing in size by the acquisition of land by purchase or by gift; by the end of 1980, it was 41,026 hectares, with 24 per cent (9866 hectares) in North Carolina

Supporting Undergraduate Research for Globally Distributed Students and Mentors

Undergraduate research is widely viewed as a high-impact practice. However, participation in undergraduate research among students completing degree programs exclusively online may be impeded due to barriers such as access limitations, time poverty, and adequate institutional support. Through an NSF I-USE project (#2021221), we formed a framework of support, including a research independent study course and a mentoring program, where we deliberately separated and defined the roles of research supervisor and research mentor. In this session, we will discuss interview data on the experiences of faculty and students in both the credit-bearing active research as well as the non-credit-bearing research mentoring program, highlighting both successes and growth areas. We will also share our ideas for moving forward with undergraduate research support for fully online students and our plans for navigating the hurdles we know are coming

Manual pages for SAGA software tools, appendix H

Several pages from the SAGA UNIX programmer's manual are presented. These pages are for SAGA software tools

Is a Framework of Support Enough? Undergraduate Research for Online STEM Students

While undergraduate research is known as a high-impact practice, little research has been conducted for the online educational setting. Early research suggests that online students and faculty have similar interest in undergraduate research as their residential (face-to-face) counterparts. This point of view presents the framework of support developed for fully online students distributed globally and shares some of the challenges faced in online undergraduate research, including the issue of low recruitment (despite stated interest) that could be exacerbated by the COVID-19 pandemic

Building Undergraduate Research in a Fully Online Engineering Program

This paper describes the creation and implementation of the support network of the Research Scholars Program at the Worldwide campus of Embry-Riddle Aeronautical University. Funded by an NSF IUSE grant, the purpose of this new program is to increase the opportunity for online engineering and engineering technology students to participate in undergraduate research. Studies have shown that participation in research can have an important impact on students, though online students are likely underrepresented in undergraduate research. The Research Scholars Program uses existing support systems of the campus while also building new components. These new components developed for this project are a research mentoring program, a workshop series, and a guided independent study course. The Research Scholars Program formalizes the process for online students at the Worldwide campus to participate in undergraduate research with a goal of having students publish and present their work

Standardization of Human-Computer-Interface for Geo-Fencing in Small Unmanned Aircraft Systems

The use of small unmanned aircraft systems (sUAS) has increased significantly in the past year. Geographic fencing (geo-fencing) is software built into most medium-cost consumer sUAS. This software is typically used to limit the altitude above launch point, the flight distance from the transmitting controller, and/or restrict flight inside a no-fly zone. While the concept of a geo-fence is simplistic, the human-computer-interface (HCI) varies drastically among platforms, and even between software iterations on the same platform. This research examines the HCI of three popular consumer-level sUAS with regard to geo-fencing. The software procedures and human interface for the DJI Inspire-1, 3D Robotics IRIS+, and Yuneec Typhoon Q500+ were evaluated through review of relevant literature, software, and flight-testing. This assessment yielded several recommendations for geo-fencing software for sUAS