1,880 research outputs found
Afropean Journeys: A Conversation with E.C. Osondu
No full textNigeria-born and US resident author E.C. Osondu debuted with the short story collection Voice of America (2010), followed by the novel This House is Not for Sale (2015) and Alien Stories (2020). His latest novel, When the Sky is Ready the Stars Will Appear, the compelling tale of an African boy’s journey towards Rome in search of a better life, was first published in translation in Italy with the title Quando il cielo vuole spuntano le stelle (2020). Only one year later, the original version of the novel was published in Nigeria. This piece, based on a conversation with the author within the context of the “Afropean Bridges” 2021 Series, introduces E.C. Osondu and his works to the Italian audience
The seismo-electric method and its sensitivity to sub-surface contrasts
No full textAbstract not availableCivil Engineering and Geoscience
A numerical model study of the stratocumulus-topped marine boundary layer
No full textA one-dimensional model with second order turbulence closure has been developed and used to investigate processes in the cloud-topped marine atmospheric boundary layer. Model developments were required to correctly apply surface flux terms near the sea surface, poor representation of which is common to several models from the recent literature. The improved surface forcing is shown to affect the predicted boundary layer structure. Other developments included the implementation of a fully implicit numerical code, which generated less numerical noise than that originally used in the model, and an improved initialisation procedure. The new model code was then shown to quantitatively reproduce processes in the stratocumulus topped boundary layer using measurements of atmospheric turbulence from aircraft from the North Sea and the subtropical North Atlantic and North Pacific. The model is robust to changes in the mixing length coefficients used in the turbulence closure and to perturbations in the initial profiles. The model is used to simulate conditions that occur as winds circulate from the subtropics towards the tradewind regions. The observed transition from a shallow stratocumulus layer to a deeper stratocumulus layer interacting with cumulus clouds beneath is simulated in response to realistic external forcing. The final stages of transition, from cumulus under stratocumulus to shallow cumulus is however not observed in the simulation; possible reasons for this are discussed. The model shows in detail the interaction between the stratocumulus layer and cumulus clouds beneath. The cumulus clouds thicken, moisten and cool the stratocumulus layer and therefore act to maintain the layer, but can also drive entrainment. The peaks inturbulent kinetic energy in the stratocumulus layer which follow cumulus penetrations of the stratocumulus layer can be large enough to directly cause the boundary layer to entrain air from above the boundary layer and grow in height. The entrained air is warmer and drier than the boundary layer air and tends to dissipate the stratocumulus layer. The model is then used to show how the imposed environmental conditions affect processes within the boundary layer. An important model prediction is that cloud top entrainment instability may act to promote mixing between the surface and cloud in deep-decoupled boundary layers. The mixing acts to replenish the cloud liquid water and sustain the cloud. Cloud top entrainment instability has previously been thought to have the capacity to lead to rapid erosion of the cloud, although this has not been observed in practice. This mechanism could help to explain the observed persistence of stratocumulus clouds under these conditions
Edward Charles Pelham-Clinton (1920-1988)
No full textAn obituary is given of E.C. Pelham-Clinton (1920-88), best known as co-author (with J.A. Campbell in 1960) of a taxonomic revision of the British Culicoides. A bibliography of his publications is appended
Ships Observing Marine Climate: a catalogue of the VOS participating in the VSOP-NA
No full textOur present knowledge of the marine climate, as represented by data sets such as COADS (Woodruff et al., 1987), is based on meteorological observations from the Voluntary Observing Ships (VOS). Because the VOS are merchant ships, rather than specially designed meteorological platforms, errors and biases exist in the data. However there is little information readily available to the climatologist either on the nature of the VOS fleet or on the observing practises which are used. This report, describing the forty-six ships that participated in the Voluntary Observing Ships' Special Observing Project - North Atlantic (VSOP-NA), therefore serves two purposes:(i) it provides a reference document to aid analysis of the VSOP-NA data set,(ii) it gives a detailed description of a subset of the VOS, which will be of value in the interpretation of marine climate data sets.This report is in two parts, Part 1 is an overall summary of the ship characteristics, Part 2 is a ship by ship description. The next section will briefly describe the VSOP-NA project, followed by a summary of the characteristics of the VSOP-NA ships (Section 3). Since these ships were specially selected (Section 2.2), the degree to which they are representative of the whole VOS fleet will be carefully considered. The meteorological instrumentation used by the VOS varies depending on which meteorological agency recruited the ships. That used on the chosen VSOP-NA ships is typical of VOS recruited by the countries bordering the North Atlantic, and will be described in Section 4. Section 5 is a summary of Part 1 of the report.Part 2 presents the VSOP-NA ship catalogue. This includes, for each ship, diagrams of the layout (indicating in particular the exposure of the sensors), a summary of the geographical positions at which observations were obtained, and details of the instrumentation used.<br/
Services in Europe: a policy for the '90s. Europe: Magazine of the European Community No. 263, January-February 1987
No full textIowa State Journal of Research 53.2
No full textSuleiman, S.A., and G.G. Brown. Spermiogenesis in the dog tick Dermacentor variabilis (Say). 93
Hollander, W.F., and W.J. Miller. Amputated, frayed, and sideburns: three new mutants in the pigeon. 109
Shaw, R.H. Calculation of soil moisture and stress conditions in 1976 and 1977. 119
Stanley, C.D., and R.H. Shaw. The relationship of evapotranspiration to open-pan evaporation through-out the growth cycle of soybeans. 129
Berry, E.C., W.D. Guthrie, and J.E. Campbell. European corn borer: relationship between leaf-feeding damage and yield losses in inbred and single-cross corn. 137
Ghidiu, G.M., E.C. Berry, and W>D> Guthrie. Systemic uptake of carbofuran in maize genotypes to control first-generation European corn borer Ostrinia nubilalis (Hubner). 147
Owens, E.D., and E.R. Hart. Mite complexes associated with apple foliage in Iowa (Arachnida: Acarina). 153
Carlson, R.E, N.N. Momen, O. Arjmand. and R.H. Shaw. Leaf-water potential and diffusive resistance relationships to yield and yield components of soybeans. 161</p
A comparison of data-driven internal multiple elimination strategies and their consequences for imaging
No full textWe compare two data-driven internal multiple reflection elimination schemes derived from regular Marchenko equations and Inverse Scattering Series (ISS). The scheme derived from regular Marchenko equations creates a new data set without internal multiple reflections. The scheme derived from ISS is equal to the result after the second iteration of the Marchenko-based scheme. It can attenuate internal multiple reflections with residuals. We evaluate the success of two schemes with a 2D complex numerical example. It is shown that Marchenko-based data-driven scheme is relatively more robust for internal multiple reflection elimination.Green 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.Applied Geophysics and Petrophysic
Análisis de las dos líneas de transmisión del tratado de Tudmīr (94 H./713 e.C.)
No full textThe two main texts of the transmission lines of the treaty of Tudmīr (94 H/713 e.C. ), included by al- ‘Uḏrī and al-Ḍabbī in their respective works, are edited and translated on the basis of an new reading of the manuscripts that contain them, and after that, we reach some conclusions about its process of copy. There are compared the two texts, and are listed its textual differences. As conclusion, we propose that Al- ‘Uḏrī’s text is the oldest, because its author has copied them from the original document of the 8th. c. (or a copy transfer of this). The transmission of al-Ḍabbī is more recent and it was based in an oral transmission of the text.Análisis de las dos líneas de transmisión del tratado de Tudmīr (94 H./713 e.C.)Los dos textos principales de las líneas de transmisión del tratado de Tudmīr (94 H/713 e.C.), incluidos por al-‘Uḏrī y al-Ḍabbī en sus respectivas obras, son editados y traducidos en base a la relectura de los manuscritos que los contienen y de ello se extraen una serie de conclusiones sobre su proceso de copia. Luego son comparados los dos textos entre sí y se enumeran una serie de diferencias textuales. Finalmente, como hipótesis interpretativa se propone que el texto de al-‘Uḏrī es el más antiguo, y habría sido copiado de un traslado del original por su autor, mientras que la transmisión de al-Ḍabbī habría sido más reciente y se habría fundado en otra fuente más antigua que habría puesto por escrito un relato oral del texto
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