1,092 research outputs found
Low temperature plasma polymerization. An effective process to enhance the basalt fibre/matrix interfacial adhesion
No full textThe interface of fibre reinforced composite materials is deeply affected by the type of sizing applied to the surface of the fibres. In this study, a polymer film based on pure tetravinylsilane (TVS) or its mixture with two different oxygen amounts was deposited on the surface of unsized basalt fibres by plasma enhanced chemical vapor deposition. At first, the influence of the plasma process was investigated through a single fibre tensile test characterization, which did not show any strength degradation of the modified fibres. Subsequently, single fibre pull-out tests were performed to study interfacial strength with an epoxy matrix. The presence of oxygen within the polymer film mixture allowed to increase the interfacial shear strength (IFSS) by 79% compared to untreated basalt fibres, highlighting an excellent fibre/matrix interface for the micro composite. After the interfacial adhesion tests, scanning electron microscopy confirmed the strong bond between the fibre surface and the deposited silane sizing
The Poudre River: history of collaboration over conflict
No full textPresented at the Fall 2014 Center for Collaborative Conservation (https://collaborativeconservation.org/) Seminar and Discussion Series, "Perspectives on the Poudre: Working River/Healthy River", September 9, 2014, Colorado State University, Fort Collins, Colorado. This fall semester's bi-weekly Seminar and Discussion Series focuses on the Poudre River and its watershed, its ecological needs, and how it is used to supply water for agriculture and urban needs. Presenters will highlight their topics and engage participants in dialogue. The series will culminate in a "world café" - campus and community open dialogue about the Poudre.Tom Cech was born and raised on a farm near Clarkson, Nebraska, graduated from Kearney State College with a Bachelor of Science Degree in Math Education, and later received a Masters Degree in Community and Regional Planning from the University of Nebraska – Lincoln. He was Executive Director of the Central Colorado Water Conservancy District in Greeley, taught water undergraduate and graduate level water resources courses at the University of Northern Colorado and Colorado State University, and is now the Director of the One World One Water (OWOW) Center for Urban Water Education and Stewardship at Metropolitan State University of Denver. Tom wrote "Principles of Water Resources: History, Development, Management and Policy," published by John Wiley & Sons - currently in its 3rd edition. Tom also recently published "Introduction to Water Resources and Environmental Issues," (co-author Dr. Karrie Pennington) with Cambridge University Press, and "Colorado Water Law for Non-Lawyers," (co-author P. Andrew Jones) with the University Press of Colorado. He has also completed histories of the Colorado Water Conservation Board and the Colorado State Engineer's Office with Bill McDonald and Dick Stenzel, respectively.Poster presentation.The meeting was held on a hot, dry summer day in 1874. Two groups of irrigators, from the downstream Union Colony (Greeley) and the new agricultural community in upstream Fort Collins - came armed with guns. The neutral Eaton Schoolhouse was too small to hold everyone, so people crammed the doorway. Most were Civil War veterans, and they all had a problem. "How would the two feuding groups divide the trickle of Cache la Poudre River water the remainder of the irrigation season - would it be based on "greatest need" or by priority (who dug their ditch first)?" The Union Colony delegates didn't like the greatest need idea, and they "hurled defiance in hot and unseemly language." The debate escalated with the Union Colony irrigators threatening to dig new irrigation ditches upstream of Fort Collins to choke off their water supply. The Fort Collins contingent objected to their uncooperative reaction. Then the meeting got ugly. One man, unable to bear the tension any longer, stood up and yelled, "Every man to his tent! To your rifle and cartridges!" It was a flashpoint in Colorado's water history. Were irrigators shot at this meeting? Who tried to calm the crowd and come up with a workable compromise for water management on the Cache la Poudre River? Tom Cech will explain this and more
The Quarries of Meroe, Sudan : Part 2 - Catalogue
No full textAbout Part 2Part 2 is a detailed catalogue of all 92 quarries recorded in the course of the project. All articles have extensive Arabic summaries.VideoThis two-part set is accompanied by five short educational and illustrative slideshows in English and Arabic about the authors’ work on the sandstone quarries around Meroe. The highlight is a 5-minute aerial and underground ‘fly-through’ video presenting quarry Q41, the largest and most impressive of the gallery quarries in the study area, available in 2D or 3D. All videos are available here: https://www.youtube.com/playlist?list=PL7-ic31cMSbvWosaClqx-qHJYtYWraVgB.AcknowledgementThis publication and the associated videos were made possible by NPRP grant 5-879-6-025 from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the author(s).Other InformationEditors: Brigitte Cech, Thilo Rehren and Abdelrahman Ali MohamedLicense: https://creativecommons.org/licenses/by/4.0See book on publisher's website: https://doi.org/10.5339/uclq.2018.9789927118883</p
Metodyczne aspekty pomiarow cech elektrycznych ziarna zboz
No full textA possibility of applying electrotechnology in plant production rises a necessity for examining electric features of the material of biological origin. Electric features of corn grain depend, to large extent, on its physical features, but also on the adopted measuring method. The author presents a comparison of results of 4 methods of the measurement of permittivity and resistivity of wheat and rye grain in the function of humidity.Właściwości elektryczne ziarna zbóż zależą w znacznym stopniu od jego cech fizycznych (wilgotność, temperatura itp.). Zauważyć należy również istotny wpływ wyboru metody pomiaru (pomiar w warstwie całych ziaren, materiału rozdrobnionego, pojedynczych nasion), układu i kształtu elektrod. Uzasadnionym wydaje sie przeprowadzenie dokładnych pomiarów mających na celu zarówno opracowanie optymalnej metody pomiaru właściwości elektrycznych ziarna zbóż jak i wnikliwe poznanie zależności miedzy cechami fizycznymi a elektrycznymi ziaren
GEOECOLOGICAL TYPIFICATION OF CENTRAL SPIS LANDSCAPE (SLOVAKIA) AND THE NATURE PROTECTION
No full textMAPPING OF TYPES OF GEOTOPES AND DETERMINATION OF THEIR DEGREE OF ANTHROPOGENIC TRANSFORMATION IN THE FORMER MINING LANDSCAPE
No full textSelekcja cech z uwzględnieniem kosztu ich pozyskania
No full textThe paper concerns the selection of features in the technical diagnostics domain. The author focused his attention on a wrapper approach. In this approach an application of the ant algorithm as a search engine is proposed. The proposed method of so-called ant wrapper approach is presented. The method takes advantage of cost of features, where the cost is connected with the cost of sensors. The algorithm as a pseudo-code and some results of a verification experiment are shown. The verification was carried out on data derived from an active diagnostic experiment concerning a rotating machine. The obtained results show, that the proposed method could allow to reduce the number of used sensors.W artykule opisano metodę selekcji cech z zastosowaniem algorytmu mrówkowego. Metoda pozwala także na uwzględnienie kosztu atrybutu, przy czym jego koszt związany jest z kosztem pozyskanie sygnału diagnostycznego. W przypadku gdy sygnał ten jest już wykorzystywany uznaje się, że koszt wyznaczenia danej cechy jest pomijalnie mały. Metodę przedstawiono w postaci pseudo-kodu i zweryfikowano dla danych pochodzących z czynnego eksperymentu diagnostycznego. Uzyskane wyniki pokazują, że istnieje możliwość ograniczenia liczby stosowanych czujników
THE IMPACT OF THE EXISTENCE AND OPERATION OF THE IMPOUNDMENT AT POSA ON THE CONTAMINATION OF WATER AND BIOTA
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