1,720 research outputs found
An investigation of the photodissociation of molecular oxygen in the 75 to 85 nm region.
No full textJones, A.L.; Blake, A.J.; Torop, L.; McCoy, D.G
The synthesis of monodisperse alkanes with long chains
No full textThis thesis discusses reasons for the interest in monodisperse long chain alkanes and describes attempts, past and present, to synthesise such molecules. Chapter 1 discusses why the synthesis of such molecules are important and the objectives of this project. Chapter 2 reviews the methods previous groups have devised to prepare pure samples of long chain alkanes. In particular, work carried out by Whiting et al. at Bristol, whose scheme formed the basis of the early work in Durham. Chapter 3 describes the work in Durham and improvements which were made to Whiting's method, allowing the synthesis of longer chain lengths and greater quantities of materials to be achieved. Chapter 4 provides a summary of the practical work carried out by the author. Chapter 5 gives experimental details of the work described in Chapter 4
Microstructure Development during Solidification of Aluminium Alloys
No full textThis Thesis demonstrates studies on microstructure development during the solidification of aluminium alloys. New insights of structure development are presented here. Experimental techniques such as quenching and in-situ High-brilliance X-ray microscopy were utilized to study the microstructure evolution during solidification.Materials Science and EngineeringMechanical, Maritime and Materials Engineerin
Painting in Poetry and Poetry in Painting: Aesthetic Reflections in D.G. Rossetti
No full textBright eyed and bushy-tailed poems and paintings are very rare, so are their past masters who create them. The history of the world literature is often brimming with such rare authors as are the unparalleled amalgamator of paintings and writings. In this field, the names, which are counted highly with boundless esteem, are of William Blake, Lewis Carroll, Hans Christian Andersen, Elizabeth Bishop, Leo Tolstoy, Lorraine Hansberry, Victor Hugo, Sylvia Plath, George Sand, Jack Kerouac, Herman Hesse, Gunter Grass, Charles Bukowski, Henry Miller, William S. Burroughs, E.E. Cummings, Tennessee Williams, Carlo Levi, J.B. Priestley, and R.N. Tagore. Undisputedly, D.G. Rossetti is one such figure. When the world literature is deconstructed, two clusters of the authors appear on the literary landscape. The first cluster consists of those authors who are painters and writers as well. The painters who have painted the literary pieces of the authors fall into the second cluster. D.G. Rossetti somewhere stands in- between. He is painter (especially illustrator) as well author-poet. But the flabbergasting certitude is that his elite poetry is found in his pieces of mural, and his elite mural in his pieces of poesy. His all creations, be they paintings, or poems, fall in three categories. In the first faction fall such pieces of his poems as are only poems—without any illustration, in the second faction fall such pieces of his paintings as are without poems, while in the third faction fall such pieces of his paintings as are with poems, or with mythical illustrations, or on certain literary pieces. Nothing to say about these groups, but one thing is clear that all of them possess aesthetic reflections. Keeping this very fact in mind, the present article aims at exploring, analyzing, and presenting the three-dimensional view in Rossetti painting and poetry with the help of the textual analysis, visual methods, and descriptive and explorative approach
Dasymutilla canella Blake 1871
No full textDasymutilla canella (Blake 1871) (Figs 1, 14, 29, 52–55) Mutilla (Sphaeropthalma) canella Blake, 1871. Trans. Amer. Ent. Soc. 3: 239. Holotype 3: Texas (ANSP). Mutilla rugulosa Fox, 1899. Trans. Amer. Ent. Soc. 25: 240. Lectotype (designated by Mickel, 1928 by referencing the “ type ” [Art. 74.5, ICZN, 1999]),Ƥ: Southern New Jersey, September (ANSP). Mutilla infensa Melander & Brues, 1903. Biol. Bull. 5: 24. Lectotype (designated by Mickel, 1928 by referencing the “ type ” [Art. 74.5, ICZN, 1999]), Ƥ: Woods Hole, Massachusetts ([WSUC]). Diagnosis. FEMALE. The female of this species can be separated from other Dasymutilla by the head shape and mesosomal sculpture. The head is slightly angulate posterolaterally (Fig. 14), the mesonotum has transverse carinae situated antero-laterally to the scutellar scale, and the propodeum is strongly asperated dorsally and posterolaterally. MALE. The male of this species can be separated from other Dasymutilla by the exceptionally large and deep propodeal reticulations. The following characters are also helpful for identification: the head and mesosoma are covered entirely with black setae, there is a seta-filled pit on S 2, there are silver setae on T 5–7, and the cuspis is roughly 0.5x the free paramere length (Figs 52, 53). Description of male genitalia (Figs 52–55). Free length of paramere dorsally curved apically, with ventral brush of long dense setae basally, remainder having scattered short sparse setae; paramere laterally kinked in basal 0.2, apices noticeably divergent. Cuspis slightly laterally compressed, tapering apically, ~0.55 × free-length of paramere, having a few scattered long setae, those on inner surface posteriorly directed. Densely setose basal lobe present. Digitus laterally curved internally, tapering slightly at apex, asetose, ~0.35 × free-length of paramere. Penial valve emarginated anterodorsally, ventral margin bidentate apically, teeth separated, unidentate medially; having longitudinal row of setae at apex and subapically on external margin. Length. Females: 3.5– 7 mm; males: 4 –7.5 mm. Host. Unknown. Distribution. This species is found in the northeastern USA and southeastern Canada. Material examined. Type material. Holotypes: Mutilla (Sphaeropthalma) canella, USA: Texas, 13 (ANSP); Lectotypes: M. rugulosa, USA, New Jersey, Southern New Jersey, 1 Ƥ (ANSP); M. infensa, USA, Massachusetts, [Barnstable Co.], Woods Hole, 1 Ƥ (WSUC); Paralectotypes, M. rugulosa, USA, New Jersey, Southern New Jersey, 2 Ƥ (ANSP); M. infensa, USA, Massachusetts, [Barnstable Co.], Woods Hole (WSUC) Other material. USA: Connecticut: New Haven Co., Bethany, 13, 24.VI. 1958 (CUIC); Massachusetts: Barnstable Co., Dennis, 13, 4.VII. 1954, J.W. Green (EMUS); Plymouth Co., Myles Standish State Forest, 10 km S Plymouth, 5 Ƥ 13, 10.VII. 2009, K.A. Williams (EMUS); Suffolk Co., Boston, 1 Ƥ, VII. 1913, F.X. Williams (EMUS); Michigan: Livingston Co., E.S. George Reserve: 6 Ƥ, 30.VI. 1950, D.G. Shappirio (EMUS; UMMZ); 2 Ƥ, 21.VII. 1950, D.G. Shappirio (UMMZ); Washtenaw Co., Ann Arbor, 6 Ƥ, 23.VII. 1950 (UMMZ); New York: Suffolk Co., Gardiners Island: 13, 3.VIII. 2008, R.G. Geolet (AMNH). At least 40 additional specimens (USA: CT, MA, MI) were examined (CASC, DGMC, UMMZ). Remarks. The phylogenetic results show a close affiliation between this species and D. macilenta. We believe these are distinct taxa, however, because of morphological differences (propodeal sculpture) seen in both sexes, differences in male genitalia, and geographic ranges. The female of this species [as D. rugulosa (Fox)] was initially placed in the D. quadriguttata species-group by Mickel (1928), because of the angulate postero-lateral head angles.Published as part of Williams, Kevin A., Manley, Donald G., Deyrup, Mark, Dohlen, Carol Von & Pitts, James P., 2012, Systematic review of the Dasymutilla monticola species-group (Hymenoptera: Mutillidae): using phylogenetics to address species-group placement and sex associations, pp. 1-29 in Zootaxa 3554 on pages 15-16, DOI: 10.5281/zenodo.21305
D.G. Ritchie's ethics
No full textThe British idealists of the late 19th and early 20th century are best known for their contribution to metaphysics, logic, and political philosophy. Yet they also made important contributions to social and public policy, social and moral philosophy and moral education, as shown by this volume.book chapterpublished
Classifying sediments on Dutch riverbeds using multi-beam echo-sounder systems
No full textThe economic importance of the Dutch rivers is very high as they are heavily used for inland waterway transport between the Netherlands and their neighbouring countries. A minimum depth must be guaranteed to keep the rivers navigable but also to ensure that the ships can carry maximum cargo. An attractive system for obtaining information about the riverbed bathymetry is the multi-beam echo-sounder (MBES). Furthermore, the MBES received echoes due to acoustic backscatter from the sediments in theory also allow for discriminating between different sediments. The aim of the research presented in this thesis was to develop methods for discriminating between different river sediments using MBES measurements. In order to fulfil this aim, MBES surveys were performed in the Rhine river and the Meuse river between 2007 and 2010. The research shows that indeed the MBES system can be used for discriminating between the different sediments present in the river areas. In addition an important finding is that areas differing in sediment type require different classification approaches.Air Transport and OperationsAerospace Engineerin
Aircraft noise calculation and synthesis in a non-standard atmosphere
No full textThe atmosphere modifies the emitted sound waves of an aircraft during propagation and is therefore important in the calculation of noise contours or synthesis. Noise contours present the resulting noise levels on the ground and are, as such, often applied for regulatory purposes. Aircraft noise synthesis is a technique that allows to transform a calculated prediction into audible sound that can be experienced in a virtual reality environment. Noise synthesis techniques allow people to be subjected to aircraft, routes or procedures that are still being designed. This dissertation describes recent research to improve the modeling of atmospheric propagation effects in aircraft noise contours as well as aircraft noise synthesis. Multi-event noise contours are usually calculated with standardized models that take non-standard propagation into account in an empirical fashion. A propagation algorithm was developed to augment such a model. Signal processing steps can be applied to transform a source noise prediction into an audible result. Furthermore, such steps can be utilized to apply propagation effects to a source noise signal. For a non-standard atmosphere this is not trivial. The role of a non-standard atmosphere is described by a dedicated simulation framework developed in this dissertation. The framework is applied to a flyover to demonstrate the effects associated with multiple ray paths and shadow zones. Besides demonstrating non-standard atmospheric effects, the framework was used to create synthesized results of actual flyovers near an airport. Subsequently, a comparison between measured results and synthesized results was executed. Furthermore, a method was designed to include the effect of turbulence-induced coherence loss of the direct and ground reflected ray in noise synthesis.Aircraft Noise & Climate EffectsAerospace Engineerin
“Dangerous modernity!”, or the shadow play of modernity and its characters: instrumental rationality — money — technology (Part 2)
No full textThe article is the second part of the essay on the phenomenon of alienation and its forms in modern societies (the first part was published in 2021, No. 4). In this part, the author focuses on technology as ‘fetishized’ by the modern thinking and on various manifestations of alienation in labor, which are not only (and not so much) a consequence of private ownership of the ‘means of production’ (according to Marx), but also a by-product of objective tendencies of social differentiation as aggravated in the course of historical development (division of labor) and the subordination of most spheres of the modern social experience to the logic of instrumental rationality. Excessive specialization, standardization, algorithmization, routinization of activities, technological and functional operationalization of the work process and professional roles, the dominance of means over goals, administrative and bureaucratic regulation and control have become ‘signs of the time’ and distinctive features of the ‘rhythm of activity’ not only in industrial enterprises, but also in non-physical labor. An important aspect (and a background circumstance) in the diagnosis of modernity is the fact that in recent centuries, modern societies have developed mainly in the urban social-ecological environment. The format and style of urban life with its role-based fragmentation and specific depersonification (and an increase in anonymity) also provoked a range of consequences that make alienation a challenge for modern societies. The author uses the concepts of classical sociological theory as a key tool for analyzing and describing the ‘universe of modernity’, and refers to the ideas of M. Weber, G. Simmel, L. Wirth, H.M. McLuhan, H. Marcuse, G. Friedmann, С. Lefort and others. © D.G. Podvoyskiy, 2022
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