134 research outputs found
Spirit Poles and Flying Pigs : Public Art and Cultural Democracy in American Communities
No full textDoss examines the way in which public art is a site of conflict and a symbol of struggle in cultural democracy by analysing in detail seven specific projects, the controversies surrounding them, and the reasons behind their failure. Doss argues that public art is most effective when it is linked to a notion of a public sphere that involves, at every level, the community in which the project is based. Index, 4 p. Biographical notes on the author. Circa 325 bibl. ref
Dutch Open Student STEEL (DOSS) Award 2021
No full textEditorialGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Steel & Composite Structure
Off Center Effect on the Photoabsorption Spectrum of the Xe@C60 Endohedral Fullerene
No full textDOSs of Xe atom located at different distances from the C60 center have been evaluated. The results indicate that the main confinement resonances result only when the Xe atom is within about 0.3 ?A around the center of C6
Theoretical investigation of X<sub>12</sub>O<sub>12</sub> (X = Be, Mg, and Ca) in sensing CH<sub>2</sub>N<sub>2</sub>: A DFT study
No full textThe feasibility of detecting diazomethane (CH2N2) in the gas phase by adsorption onto the exterior surface of inorganic-based X12O12 (where X can be Be, Mg, or Ca) nanocages is investigated here using DFT. All the structures, including those of the pristine CH2N2 and of the nanocages, as well as of the CH2N2/nanocage systems, have been optimized using the B3LYP-D3, M06-2X, ωB97XD, and CAM-B3LYP functionals, in conjunction with 6-311G(d) basis set. NBO, NCI, and QTAIM analyses results are in good agreement with each other. Furthermore, the Density Of States (DOSs), the natural charges, the Wiberg Bond Indices (WBI), and natural electron configurations were considered to investigate the nature of intermolecular interactions. The energy calculations indicate a strong size-dependent adsorption, with the nanocages comprised of large atoms being able to attract CH2N2 more strongly, and hence bind with it more effectively. The adsorption incurs also significant changes to HOMO and LUMO energies.Accepted Author ManuscriptAtmospheric Remote Sensin
Performance of Middle-Eastern Alfalfa ecotypes in the Southwestern USA using traditional and contemporary harvest management practices
No full textNon-winterdonnant alfalfa (Medicago sativa L) from the Middle East regrows rapidly and<br>produces high forage yield making it attractive for use in wann-desert regions. In the Middle East, alfalfa<br>is commonly harvested before flowering (bud stage) leaving less than 2 cm stubble. Alfalfa from this reg-ion<br>has unique adaptations to this management and regrow predominately from meristems originating<br>near the stem base. Harvest management may influence productivity of Middle-Eastern alfalfas in<br>mechanized agriculture where late harvest and cutting heights between 8 and 12 cm predominate. We<br>compared yield, persistence, and crown architecture of six Middle-Eastern alfalfa ecotypes under tradi-tional<br>(preflowering + 2 cm stubble) and contemporary harvest management (10% bloom + 10 cm stub-ble),<br>and a combined regime (preflowering + 10 cm stubble) in a 27-month trial in Arizona. Contempo-rary<br>harvest management resulted in significantly higher forage yield in the Middle-Eastern accessions<br>than in either of the other regimes and did not disturb the initiation of regrowth stems. Forage yields of<br>the most productive Middle-Eastern ecotype were 11 to 20% higher than an elite southwestern cultivar<br>regardless of harvest regime. The combined regime, with its higher forage quality, may be preferred as<br>Middle-Eastern alfalfas are utilized in mechanized agriculture.Corresponding Author:
Dr. Abdullah Abdulaziz Al-Doss, Professor
Plant Production Dept. Collage of Food & Agric. Sciences, P.O. Box 2460 Riyadh-11451, Saudi Arabia
Email [email protected]
TWENTY-FIVE YEARS OF RESEARCH ON WOMEN FARMERS IN AFRICA: LESSONS AND IMPLICATIONS FOR AGRICULTURAL RESEARCH INSTITUTIONS; WITH AN ANNOTATED BIBLIOGRAPHY
No full textBased on an extensive review of the literature on women farmers in Africa, this paper explores the potential reasons why women farmers have not adopted improved maize technologies and discusses the implications for agricultural research. Women farmers are often constrained by their lack of access to labor, land, and inputs. In addition, women may prefer different outputs than men. Finally, the dynamics of household decision-making affects technology adoption; roles and responsibilities within the household are often renegotiated when new technologies are adopted, and women may be reluctant to provide labor if they do not receive some of the benefits. Each section of this paper includes a number of questions that may provide insights into the gender roles and dynamics in a particular community. Three general conclusions can be drawn from the available literature. First, there is enormous complexity and heterogeneity among African households. Second, there is no simple way to summarize gender roles within African households and communities. Third, gender roles and responsibilities are dynamic; in particular, they change with new economic circumstances. An extensive annotated bibliography on gender issues and the adoption of maize technologies in Africa follows the review of studies.Farm Management, Labor and Human Capital,
Impact of box-type floating breakwater on motion response of hydrodynamically coupled floating platforms downstream
No full textFloating breakwaters are applicable in several offshore applications to protect downstream structures from excessive wave loads and to reduce their motion response. This thesis investigates the impact of the leading platform, functionally a breakwater, on the RAOs and response of the platforms behind it in frequency domain. The structures are only hydrodynamically coupled. All models were analysed for head waves only. Variables in model design are investigated using a combination of diffraction software and solving equations of motion in six degrees of freedom for each body. The variables are the gap between the breakwater and the first platform, the width, i.e. side perpendicular to wave direction, of the breakwater and the gap between platforms. Base case dimensions for the platforms and breakwater are chosen based on the natural frequencies and wave transmission coefficients respectively. These choices are made to function well for the wave spectrum at the chosen site. Each case analysed included a breakwater and 10 platforms downstream of it. It was found that he imperfect efficiency of a breakwater means that the first few platforms behind it act as breakwaters too; albeit for much lower wave energies. Increasing the gap between the breakwater and the first platform behind it results in a decrease in RAO of the platforms due to increasing hydrodynamic coupling. The impact on pitch RAOs is greater than the impact on the heave RAOs. Increasing the width of the breakwater results in minimal reduction in RAOs of the platforms behind it at large gap sizes. At small gap sizes, there is an adverse relationship. Hydrodynamic coupling between the platforms can lead to shared natural frequencies within the design frequency range, leading to a large motion response. This can be prevented by changing the gap size and thereby the hydrodynamic coupling and moving the natural frequency outside of the design range. A breakwater and multiple platforms downstream of dimension L=100 m, B=100 m, T=5 m, with a gap of 80 m between the breakwater and platforms and 100 m between the platforms themselves was shown to effectively reduce the motions of the downstream platforms. The first few platforms exhibit higher heave than the other platforms, but similar pitch to the other platforms. Therefore, their use cases in a floating city must be chosen accordingly. The potential negative impacts of hydrodynamic coupling between the platforms means that the platforms must be further apart from each other, resulting in floating cities with a much larger footprint than previously expected. Further research into the motion response for 2D structure layout and different wave directions would be interesting follow-ups to this thesis.Offshore and Dredging Engineerin
Les talk-shows en Égypte
No full textÀ travers l’étude des talk-shows au sein de l’Égypte prérévolutionnaire, et dans le contexte de la naissance des médias télévisuels, l’auteure s’interroge sur la manière dont ces émissions ont marqué cet espace public. Elle questionne ensuite le sort de ce phénomène télévisuel, dans un contexte de restauration autoritaire. Pour analyser ces dynamiques, l’auteure suit le parcours de plusieurs émissions, se basant principalement sur une série d’entretiens menés auprès de professionnels de ces émissions et des acteurs des sphères politique et sociale.The author studies talk shows in pre-revolutionary Egypt in the early days of TV media and the impact they had on that public arena. She then looks at what happened to this TV phenomenon with the advent of an authoritarian regime. To analyze these dynamics, the author follows the trajectory of a number of these shows. The analysis is largely based on a series of interviews with people who worked on the shows as well as some of the country’s social and political players.La autora del artículo, mediante el estudio de talk-shows en el ámbito del Egipto prerrevolucionario y en el contexto del surgimiento de los medios televisivos, se interroga sobre la manera en que estas emisiones han marcado este espacio público. Dicha autora cuestiona posteriormente el destino de este fenómeno televisivo, en un contexto de restablecimiento autoritario. Para analizar estas dinámicas, dicha autora hace un seguimiento a la trayectoria de varias emisiones, basándose principalmente en una serie de entrevistas llevadas a cabo con profesionales de las emisiones y actores de esas esferas política y social
The Promoter of Rv0560c Is Induced by Salicylate and Structurally-Related Compounds in <i>Mycobacterium tuberculosis</i>
No full textPMCID: PMC3317779This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
- …
