A trans-theoretical model for the adoption of drones by large-scale German farmers

2020 ◽  
Vol 75 ◽  
pp. 80-88 ◽  
Author(s):  
Marius Michels ◽  
Cord-Friedrich von Hobe ◽  
Oliver Musshoff
1999 ◽  
Vol 8 (6) ◽  
pp. 671-685 ◽  
Author(s):  
Jui Lin Chen ◽  
Kay M. Stanney

This paper proposes a theoretical model of wayfinding that can be used to guide the design of navigational aiding in virtual environments. Based on an evaluation of wayfinding studies in natural environments, this model divides the wayfinding process into three main subprocesses: cognitive mapping, wayfinding plan development, and physical movement or navigation through an environment. While this general subdivision has been proposed before, the current model further delineates the wayfinding process, including the distinct influences of spatial information, spatial orientation, and spatial knowledge. The influences of experience, abilities, search strategies, motivation, and environmental layout on the wayfinding process are also considered. With this specification of the wayfinding process, a taxonomy of navigational tools is then proposed that can be used to systematically aid the specified wayfinding subprocesses. If effectively applied to the design of a virtual environment, the use of such tools should lead to reduced disorientation and enhanced wayfinding in large-scale virtual spaces. It is also suggested that, in some cases, this enhanced wayfinding performance may be at the expense of the acquisition of an accurate cognitive map of the virtual environment being traversed.


2012 ◽  
Vol 16 (1-2) ◽  
pp. 1-28
Author(s):  
Juanita Karpf

AbstractAfrican-American scholar, theologian, and musician Jon Michael Spencer issued his initial publications on his theory of theomusicology in 1986. As an alternative to more traditional musicologies, Spencer specifies theomusicology as a theoretical model of theologically, biblically, and spiritually-informed historical and analytical studies in music, of particular appropriateness to African-American music making. Theomusicology redirects the analytical and critical objectivity of musicologies to facilitate concentration on iterations of ethical, religious, and mythological beliefs, regardless of their medium, location, and cultural function. It seeks ways to describe the synthesis of the sacred and profane—the meshing of seeming opposites. This article explores the application of theomusicology to African-American performances of a popular large-scale vocal work entitled,Esther, the Beautiful Queen, written in 1856 by U.S. composer William Bradbury.


Author(s):  
J Kubie

This paper analyses the outflow of liquids from single-outlet vessels. In such vessels the liquid leaving the vessel through the outlet is replaced by another fluid, which enters the vessel through the same opening. A theoretical model is developed for the general case of gas—liquid systems. The model, based on a simplified description of the system, is derived from first principles, and contains one adjustable parameter. Irrespective of the numerical value of this parameter the model describes qualitatively the various phenomena observed experimentally, such as the linear variation between the large-scale gas void fraction in the vessel and the elapsed time. A correlation for the adjustable parameter is presented and its significance discussed. The model is in excellent agreement with the available experimental data on the variation of the large-scale gas void fraction in the vessel and the large-scale gas pressure in the vessel with elapsed time. The application of the model is also discussed.


1994 ◽  
Vol 347 ◽  
Author(s):  
Arvto C. Johnson ◽  
Robert J. Lauf ◽  
April D. Surrett

ABSTRACTThis paper reports on the results of experimental studies of the effect of bandwidth on the uniformity of energy distribution in a multi-mode cavity as well as on the development of a theoretical model to, at least qualitatively, describe the effect of varying the processing frequency. Using a mapping method reported in earlier work, Microwave Laboratories and Oak Ridge National Laboratory personnel have graphically measured the effect of processing bandwidth on heating uniformity. These results can be compared to the effects of other attempts to improve uniformity e.g., “mode stirrers.” Additional insight into the effect of bandwidth on time-averaged energy distribution within the cavity can also be gained from the simple theoretical model, which is presented for comparison with the experimental results. Finally, this paper uses the presented results to comment on the scalability of the variable frequency microwave processing methodology for large-scale applications.


2016 ◽  
Vol 1 (1) ◽  
pp. 41-54 ◽  
Author(s):  
Eva Kassens-Noor

Mega-events like the Olympic Games are powerful forces that shape cities. In the wake of mega-events, a variety of positive and negative legacies have remained in host cities. In order to bring some theoretical clarity to debates about legacy creation, I introduce the concepts of the mega-event utopia, dystopia and heterotopia. A mega-event utopia is ideal and imaginary urbanism embracing abstract concepts about economies, socio-political systems, spaces, and societies <em>in</em> the host <em>during</em> events. The mega-event utopia (in contrast to other utopian visions other stakeholders may hold) is dictated by the desires of the mega-event owners irrespective of the realities in the event host. In short, a mega-event utopia is the perfect event host from the owner’s perspective. Mega-event utopias are suggested as a theoretical model for the systematic transformation of their host cities. As large-scale events progress as ever more powerful transformers into this century, <em>mega-event dystopias</em> have emerged as negatives of these idealistic utopias. As hybrid post-event landscapes, m<em>ega-event heterotopias</em> manifest the temporary mega-event utopia as legacy imprints into the long-term realities in hosting cities. Using the Olympic utopia as an example of a mega-event utopia, I theorize utopian visions around four urban traits: economy, image, infrastructure and society. Through the concept of the <em>mega-event legacy utopia</em>, I also provide some insight toward the operationalization of the four urban traits for a city’s economic development, local place marketing, urban development, and public participation.


2019 ◽  
Vol 7 (3) ◽  
pp. 342-353
Author(s):  
Hanan Abd Elwahab El Sayed ◽  
Heba Abdel-Fatah Ibrahim ◽  
Samia Abdel Hakeem Hanseen Aboud ◽  
Ahlam Elahmady Mohamed Sarhan

2020 ◽  
Vol 9 (1) ◽  
pp. 221
Author(s):  
Nader Sharifi ◽  
VahidKohpeima Jahromi ◽  
SepideBahlouli Ghashghaei

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