276,340 research outputs found
Author, publisher and bookseller : a tripartite synergy in Nigerian book industry
No full textThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
A distribution study of deep-sea macrobenthos collected from the western Gulf of Mexico
No full textVita.One of Texas A&M University's more detailed oceanographic cruises was that of R/V ALAMINOS 69A11, basically biological in scope but also including hydrographic, sediment coring, and bottom photography stations. Dredge sampling of the deep-sea macrobenthos was accomplished by means of the benthic skimmer in three western Gulf regions (Galveston, Tampico, and Vera Cruz). This distribution study of the benthic macrofauna revealed five faunal zones that were differentiated on a bathymetric basis. These have been designated as Outer Continental Shelf, Upper Continental Slope, Lower Continental Slope, Continental Rise, and Abyssal Plain. Faunal breaks revealed by the similarity dendrogram, constructed from individual station data, support the proposed faunal zones. Recurrent patterns of species occurrence were used to formulate benthic assemblage, showing expected species and their relative abundance, for specific depths within the faunal zones. Data concerning species occurrence within the three geographic regions of the western Gulf under consideration were not sufficient to warrant extension of existing biotic provinces into the deep sea. Analysis of sea-floor photographs revealed at least 87 living organisms, various plant fragments, sediment composition and texture, and other ichnological phenomena. Several selected photographs have been included. A phylogenetic list of all benthic species, including author and date, collected as living specimens at one or more of the dredge stations has been compiled. Slight modification and combination of the suprageneric taxonomy used by earlier authors was utilized
Interpretar as percepções sobre Homens e Mulheres de 17 nacionalidades obtidas num contexto Português: Um pré-teste
No full textAbstract: Individuals have the propensity to attribute certain characteristics to nations or regions, and those living within, although the accuracy of this is under debate. In this pretest, Portuguese participants were asked to evaluate men and women from 17 nationalities based on dimensions which might be related to individualistic- or collectivistic-oriented nations – namely perceived masculinity, percentage of gays/lesbians in each group (PGL), and economic status. We predicted conceptualizations of nationality to trump gender triggers, resulting in general evaluations of individuals from each nation in this context-absent scenario. Results revealed strong relationships between men and women from the same nationality, and greater variability among nationalities in the evaluations of male targets, supporting the notion national stereotypes may be more representative of the men from each nation (i.e., androcentrism). Additionally, individualist-oriented nations were found to have higher PGL and economic status ratings when compared to collectivist-oriented nations, but both were perceived as equally masculine. Finally, gross domestic product per capita (GDPpc) of each nation appeared to somewhat act as a function of participants’ judgements. Findings generalize literature to a Portuguese context, providing insight into the manner in which individuals may categorize those from various nationalities.Resumo: Os indivíduos atribuem frequentemente certas características a nações e regiões, e àqueles que nelas vivem, apesar da acuidade com que o fazem ser tema de debate. Neste pré-teste, foi pedido a participantes Portugueses para avaliarem Homens e Mulheres de 17 nacionalidades com base em dimensões que podem estar relacionadas com nações orientadas para o individualismo ou coletivismo – nomeadamente masculinidade percebida, percentagem de gays/lésbicas em cada grupo (PGL), eestatuto económico. Previu-se que as conceptualizações de nacionalidade superassem os factores de género, resultando e avaliações genéricas dos indivíduos de cada nação neste cenário de ausência de contexto. Os resultados revelaram fortes relações entre homens e mulheres da mesma nacionalidade, e uma maior variabilidade entre nacionalidades nas avaliações dos alvos masculinos, apoiando a noção de que os estereótipos nacionais podem ser mais representativos dos homens de cada nação (i.e.,androcentrismo). Além disso, as nações orientadas para o individualismo apresentaram classificações mais elevadas dePGL e de estatuto económico quando comparadas com as nações orientadas para o coletivismo, mas ambas foram consideradas igualmente masculinas. Por fim, o produto interno bruto per capita (PIBpc) de cada nação pareceu atuar de alguma forma em função dos julgamentos dos participantes. Os resultados generalizam a literatura a um contexto Português, fornecendo uma visão sobre a forma como os indivíduos podem categorizar as pessoas de várias nacionalidades
Detection of weak stochastic forces in a parametrically stabilized micro-optomechanical system
No full textMeasuring a weak force is an important task for micromechanical systems, both when using devices as sensitive detectors and, particularly, in experiments of quantum mechanics. The optimal strategy for resolving a weak stochastic signal force on a huge background (typically given by thermal noise) is a crucial and debated topic, and the stability of the mechanical resonance is a further, related critical issue. We introduce and analyze the parametric control of the optical spring, which allows us to stabilize the resonance and provides a phase reference for the oscillator motion, yet conserving a free evolution in one quadrature of the phase space. We also study quantitatively the characteristics of our micro-optomechanical system as detector of stochastic force for short measurement times (for quick, high-resolution monitoring) as well as for the longer-term observations that optimize the sensitivity. We compare a simple strategy based on the evaluation of the variance of the displacement which is a widely used technique) with an optimal Wiener-Kolmogorov data analysis. We show that, due to the parametric stabilization of the effective susceptibility, we can more efficiently implement Wiener filtering, and we investigate how this strategy improves the performance of our system. We finally demonstrate the possibility to resolve stochastic force variations well below 1% of the thermal noise.MicroelectronicsElectrical Engineering, Mathematics and Computer Scienc
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
A principal in transition: an autoethnography
No full textThis research represents a highly personalized account of the complexities,
interpretations, and reflections of a principal in transition from one elementary school to
another elementary school in the same district. Using myself as the subject and the
researcher in the social context of an elementary school provided the impetus for this
self-study. Through an insider's vantage point, I have chronicled and traced the
experiences of my own administrative transition using the qualitative methodology of
autoethnography. This genre of qualitative research brings the reader closer to the
subculture studied through the experiences of the author. While every campus and
district has its own unique culture and environment, the introspection and evaluation
provided by the methodology of autoethnography greatly facilitates an understanding of
the processes of transition. The experiences I have encountered, the problems I face, and
the interpretations derived from them will strengthen my own practice as a public school
administrator and provide insight into the ever-changing administrative position called
the principalship. Data gathering consisted of a reflexive journal, my personal calendar, faculty
agendas, staff memos, and reflective analysis. At the completion of the school year
common strands, key attributes, and coding of the data served to provide retrospective
insights. These research tools were used to capture the experiences of my administrative
transition.
The results of this study were expressed in a personal narrative that comprises
Chapters IV through VI. Chapters I through III present a traditional dissertation model
that includes the introduction, review of literature, and research methodology. Chapter
VII offers recommendations, a discussion of the findings and concluding remarks
The relationship of germination parameters to field adaptation and heat stress tolerance in Sorghum bicolor (L.) Moench
No full textTypescript (photocopy).Four separate but related experiments were conducted in 1981 to 1983 in an effort to expand on and clarify previous research results relating to the base germination temperature of Sorghum bicolor (L.) Moench and that parameter's relationship to adaptation. A second germination parameter was examined to determine if field heat stress tolerance could be screened for by germination tests. A new technique and corresponding statistical model were developed to measure base germination temperature. A second parameter was established which measured sorghum genotypes' ability to withstand very high temperatures (50(DEGREES)C) during germination. These two germination parameters were than used to select F(,4) lines of two R and two B-line crosses for field evaluation at 12 locations extending from Puerto Rico to Nebraska. The agronomic and climatic data from these locations were then used to test the efficacy of the two germination parameters established in the first experiment for predicting adaptation in the first case and field heat tolerance in the second. F(,4) genotypes with high base germination temperatures were earlier to mature, taller, and higher yielding than their sibling lines with low base germination temperatures. These effects were barely discernible in Puerto Rico, but became more obvious in locations which were more temperate in nature. The heat stress tolerance (HST) index was negatively correlated to yield at the hottest locations. A third experiment determined if divergent selection for base germination temperature (G50) and heat stress tolerance (HST) would result in genetic gain in the direction of selection. Only in the case of selection for high HST was divergent selection able to separate significantly F(,4) plants and their selected F(,4) progenies. Low numbers of pairs to test confounded the G50 experiments, as less than 6 F(,5) plants produced sufficient F(,4) seed for testing in either G50 selection scheme. The last experiment was designed to determine if the environment of the maternal plant during seed maturation affected the germination parameters discussed above. Seed produced at College Station under higher temperatures and longer daylengths during seed maturation had significantly higher G50 values than seed produced at three other locations with lower temperatures and shorter daylengths. . . . (Author's abstract exceeds stipulated maximum length. Discontinued here with permission of author.) UM
Designing the Radio Link for a Lunar CubeSat: the LUMIO Case
No full textThe Lunar Meteoroid Impact Observer (LUMIO) is a mission designed to observe, quantify, and characterize the meteoroid impacts by detecting their flashes on the lunar far side. Earth-based lunar observations are restricted by weather, geometric and illumination conditions, while a lunar orbiter can improve the detection rate of lunar meteoroid impact flashes, as it would allow for longer monitoring periods. This paper will focus on the communications and radio navigation system of the mission, designed for the ESA roadmap for lunar exploration. LUMIO has been designed to operate autonomously after deployment from a lunar mother spacecraft in a low inclination lunar orbit and to reach without human intervention his final destination orbit close to the Earth-Moon L2 point, where science can be carried out. Being the destination orbit always in view from Earth (despite a distance of 460000 - 480000 km), Direct-to-Earth communication was added to the mission as a mean to reduce risk and allow independent verification of several of the innovative technologies that would be demonstrated, first of all autonomous navigation. A detailed link budget analysis will be presented for all mission phases for both the link with the mother spacecraft in low lunar orbit and the link with Earth. Beside defining the achievable data transfer, we will focus also on evaluating the available ground stations to better evaluate mission cost with respect to science return. Radio-navigation performances will also be evaluated to estimate the position and relative velocity accuracy, given also the limited performances available for the on-board navigation transponder. This will help also better defining the on-board autonomous navigation system, constraining the total error budget. Further strategies, such as beacon tones, will be evaluated to lower the overall operational cost by employing continuous monitoring with a low performances ground station and, only when needed, perform high speed downlink using a deep-space class ground station. This strategy is considered of extreme importance, especially for small missions, to allow opportunistic operations on high gain antennas, given their very busy schedule. Keywords: LUMIO, CubeSat, Lunar, Radio, linkGreen 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.Space Systems Egineerin
The long-wavelength view of GG Tau A: rocks in the ring world
No full textWe present the first detection of GG Tau A at centimetre wavelengths, made with the Arcminute Microkelvin Imager Large Array at a frequency of 16 GHz (λ = 1.8 cm). The source is detected at >6 σrms with an integrated flux density of S16GHz = 249 ± 45 µJy. We use these new centimetre-wave data, in conjunction with additional measurements compiled from the literature, to investigate the long-wavelength tail of the dust emission from this unusual protoplanetary system. We use an MCMC-based method to determine maximum likelihood parameters for a simple parametric spectral model and consider the opacity and mass of the dust contributing to the microwave emission. We derive a dust mass of Md ~ 0.1 Msun, constrain the dimensions of the emitting region and find that the opacity index at λ > 7 mm is less than unity, implying a contribution to the dust population from grains exceeding ~4 cm in size. We suggest that this indicates coagulation within the GG Tau A system has proceeded to the point where dust grains have grown to the size of small rocks with dimensions of a few centimetres. Considering the relatively young age of the GG Tau association in combination with the low derived disc mass, we suggest that this system may provide a useful test case for rapid core accretion planet formation models
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