Search Results

Advanced search parameters have been applied.
open access

Studies on the Drumming Behavior of North American Stoneflies (Plecoptera)

Description: Drumming behavior is described for the first time in 16 North American species of Plecoptera, and signals of a 17th species, Isogenoides zionensis, are further detailed. The effective distance over which drumming signals may be transmitted was tested for four communication modes. Results indicate that substratum vibrations are far superior to sound in the transmission of drumming signals, and that dense substrates such as rocks are poor channels for signal transfer. Long communication periods between stonefly pairs of Taeniopteryx burksi resulted in some alterations from initial signaling characteristics.
Date: May 1984
Creator: Zeigler, David D.
Partner: UNT Libraries
open access

An Analysis of Factors in the Adoption or Non-Adoption of Videodisc Technology in North American Academic and Special Libraries

Description: The researcher identified 37 independent variables to study their effect on the two dependent variables, the acquisition of videodiscs and the functions for which videodisc programs were acquired. The literature of the applications of videodisc technology in libraries, museums, education and industry, as well as related issues concerning interactive video, were presented in Chapter 2. Using the diffusion of innovation theory of Everett Rogers as a guide, the researcher constructed a questionnaire. Valid responses totaled 462 from management of all types of academic libraries and from special libraries other than non-academic law, military, veterans' hospital, and church libraries. The following conclusions were made from the results: there were significant correlations between having videodiscs and perceptions of greater benefits than costs, appropriateness of videodisc programs for libraries' objectives or curricula, seeing videodiscs as an enhancement of an existing library technology, collection of videocassettes, and ability to raise funds from slack resources. The size of the libraries' materials and equipment budgets had some significance, but it was not consistently significant, as it was for the above-mentioned factors, at the p < .01 level. Lack of in-house recording ability did not impose a barrier on adoption of discs among respondents. Full--motion, full-screen video was not seen as very important for future multimedia use.
Date: December 1992
Creator: Kelley, Robert E. (Robert Emmett)
Partner: UNT Libraries
open access

Revisions of Ulmus and Zelkova in the Middle and Late Tertiary of Western North America

Description: Abstract: Examination of previously described and some undescribed leaves of Ulmus and Zelkova from the later Oligocene, Miocene, and Pliocene of western North America indicates that at least eight species of Ulmus and two species of Zelkova are represented. Three new species are described: Ulmus chaneyi, U. knowltoni, and Zelkova browni.
Date: 1977
Creator: Tanai, Toshimasa & Wolfe, Jack A.
Partner: UNT Libraries Government Documents Department

Standard Time Zones of the United States and adjacent Parts of Canada and Mexico as of October 1, 1935

Description: One map showing standard time zones of the United States as of October 1, 1935, with an updated map showing new boundaries in Georgia, Ohio, and Michigan. Notes on the first map describe the changes effective September 27, 1936 and November 23, 1941.
Date: 1935
Creator: Geological Survey (U.S.)
Partner: UNT Libraries Government Documents Department
open access

Biodiversity of Caddisflies (Trichoptera) of the Interior Highlands of North America

Description: Caddisflies (Trichoptera) were collected from over 500 different locations throughout the Interior Highlands (Ozark, Ouachita, Arbuckle, and Wichita Mountains) between March 1990 and March 1994. I systematically sampled representative lotic and lentic habitats in 131 natural watersheds that comprise the 17 different physiographic subregions of this area. From my examination of approximately 60,000 specimens, surveys of regional museum collections, and review of literature records, I document 229 species distributed in 16 families and 58 genera. Included in this total are 27 endemic species and 15 new regional records. Descriptions are provided for a species new to science (Cheumatopsyche robisoni), four larvae (Helicopsyche limnella, H. piroa, Marilia species A, Polycentropus crassicornis) and a female (Helicopsyche piroa). Hydropsyche reiseni Denning, previously known only from the Arbuckle Mountains, is reduced in synonymy with H. arinale Ross. Further, I provide illustrated family, generic, and selected species-level keys that reflect this regional biodiversity.
Date: August 1994
Creator: Moulton, Stephen R. (Stephen Richard)
Partner: UNT Libraries
open access

Proposed U.S.-Mexico-Canada (USMCA) Trade Agreement

Description: This report discusses the U.S.-Mexico-Canada Agreement (USMCA), which is to replace the North American Free Trade Agreement (NAFTA). Topics include market access, dispute settlement, intellectual property rights (IPR), energy, and labor and environment.
Date: October 5, 2018
Creator: Fergusson, Ian F. & Villarreal, M. Angeles
Partner: UNT Libraries Government Documents Department
open access

Correlation Papers: the Newark System

Description: From outline: The aim of this paper is to review the progress of our knowledge concerning a well defined system of rocks on'the Atlantic border, named the Newark system; to summarize the present state of information concerning it, and to discuss the bearing that its study has on principles of correlation.
Date: 1892
Creator: Russell, Israel Cook
Partner: UNT Libraries Government Documents Department
open access

Correlation Papers: Archean and Algonkian

Description: From outline: This hook is a review of the present state of knowledge of the general structure of the pre-Cambrian rocks of the United States and Canada. The material contained in the historical chapters is of two kinds: Summaries of all articles pertaining to the subject considered, and summaries of the conclusions which appear to be established. The first represents the substance of the literature; the second brings together the important ascertained structural facts, and often times becomes a more or less extended discussion. The final chapter covers the same grounds as the historical chapters for the various pre-Cambrian in general successions proposed by different authors, and also contains a discussion of results and the principles upon which they are based. Within the chapters, individual districts or regions are given separate sections, and the summary of literature for each is arranged in chronological order.
Date: 1892
Creator: Van Hise, Charles Richard
Partner: UNT Libraries Government Documents Department
open access

Results of Primary Triangulation

Description: From introduction: The triangulation of the U. S. Geological Survey is executed solely for the primary control of topographic work upon scales not exceeding 1: 62500. The extreme of accuracy has therefore not been sought, but only such a degree of accuracy as to insure that the maximum accumulated error be imperceptible upon the maps.
Date: 1894
Creator: Gannett, Henry
Partner: UNT Libraries Government Documents Department
open access

Cross-Border Energy Trade in North America: Present and Potential

Description: This report provides an overview of the United States' energy trade with Canada and Mexico. For the principal energy commodities, it summarizes estimates of the resource potential for the three countries, recent energy production, and expectations for future production.
Date: January 30, 2017
Creator: Parfomak, Paul W.; Campbell, Richard J. & Pirog, Robert
Partner: UNT Libraries Government Documents Department
open access

North American Continental Margins : a Synthesis and Planning Workshop : Report of the North American Continental Margins Working Group for the U.S. Carbon Cycle Scientific Steering Group and Interagency Working Group

Description: Report of the findings and recommendations of the North American Continental Margins workshop held in Boulder Colorado in September of 2005 to assess the state of carbon cycle science in the margins surrounding North America.
Date: 2008
Creator: United States Carbon Cycle Science Program
Partner: UNT Libraries Government Documents Department
Back to Top of Screen