2,034 research outputs found
Architectural illustrations... 1899
No full textArchitectural illustrations / A.W. Leh. [s.l.] : The author, 1899. 1 leaf, 23 plates ; 21 x 29 cm
Hydrodynamics, acoustics and scaling of traveling bubble cavitation
No full textRecent observations of the geometries of growing and collapsing bubbles over axisymmetric headforms have revealed the complexity of the "microfluidmechanics" associated with these flows (Hamilton et al., 1982, Briancon Marjollet and Franc, 1990, Ceccio and Brennen, 1991). Among the complex features observed were bubble to bubble interaction, cavitation noise generation and bubble interaction with the boundary layer which leads to the shearing of the underside of the bubble and alters the collapsing process. All of these previous tests were performed on small headform sizes. The focus of this research is to determine the dynamics governing the growth and collapse of traveling bubbles and to analyze the scaling effects due to variations in geometry size, Reynolds number and cavitation number. For this effect, cavitating flows over Schiebe headforms of different sizes (5.08cm, 25.4cm and 50.8cm in diameter) were studied in the David Taylor Large Cavitation Channel (LCC). This thesis presents the scaling effects captured on high-speed film and electrode sensors as well the noise signals generated during the collapse of the cavities. The influence of each of these parameters on the dynamics involved in the growth and collapse phases of the traveling bubble are presented, along with the acoustical impulse produced during the collapse of the bubble.
In order to model and analyze the dynamics of the three-dimensional bubble deformation in the presence of the pressure field around the Schiebe headform, an unsteady numerical code using traveling sources has been developed. This thesis presents calculations of the interaction between the irrotational flow outside the boundary layer of the headform and individual traveling bubbles. An error estimation of the method and comparisons with the LCC experiments are presented. This method is shown to predict some of the features of three-dimensional bubble growth and collapse dynamics remarkably well. Furthermore, analysis of these computations allow a better understanding bubble interaction and event rate prediction
Festuca ovina L., s.l. en Festuca rubra L., s.l. in Nederland
No full textThe author gives a survey of the taxa belonging to Festuca ovina L., s.l. and F. rubra L., s.l. as they occur in the Netherlands. Four species are distinguished, viz. F. ovina L., F. trachyphylla (Hack.) Kraj., F. heterophylla Lamk., and F. rubra L. F. ovina L. is represented by 3 subspecies, subsp. tenuifolia (Sibth.) Čelak., subsp. ovina, and subsp. cinerea (Vill.) Duyfjes, nov. comb.; F. rubra L. can be subdivided into 2 subspecies, subsp. rubra and subsp. juncifolia (St. Am.) R. Lit.
Of these taxa F. heterophylla is most probably introduced with grass-seeds; the others are native
Life of Saint Gregory the Great Written in Four Books by John the Deacon: A Translation and Commentary of Book III
No full textThose interested in St. Gregory and his times find constant reference to the life of that pope written by John the Deacon. Because no translation of that work has hitherto appeared in English, a group of students, at the suggestion of Dr. L.V. Jacks, director of the classical department of The Creighton University, decided to undertake a translation and commentary on the Vita as their piece of research. |Since Books I and II of the Vita Sancti Gregorii Magni were already in process of translation when this work was begun, the original plan was to present a translation and commentary on Books III and IV. However, as the manuscript took shape, it ran into a forbidding length--some three hundred pages of translation alone; hence the first plan was abandoned and the scope of the work was limited to the third book alone. The text used was that of J.P. Migne, Volume LXXV of Patrologlae cursus completus Patrum Latinorum, which in the course of this study will be referred to as the Patrologia Latina. |Through the commentary the author has endeavored to supplement and clarify the text and to present various views on controversial questions. No textual, grammatical, or stylistic problems are handled, herein since these points have already been treated by competent scholars in this field. |This study has the secondary purpose of examining the historiography of John the Deacon in the Vita III. As background material a chapter containing the few known facts about this Roman deacon of the ninth century and his works has been included; also a chapter dealing with the early life and writings of St. Gregory because this material is not included in Book III.ProQuest Traditional Publishing Optio
An Estimation of the Entomological Inoculation Rate for Ifakara: A Semi-Urban Area in a Region of Intense Malaria Transmission in Tanzania.
No full textAn entomological study on vectors of malaria and their relative contribution to Plasmodium falciparum transmission in the semi-urban area of Ifakara, south-eastern Tanzania, was conducted. A total of 32 houses were randomly sampled from the area and light trap catches (LTC) performed in one room in each house every 2 weeks for 1 year. A total of 147 448 mosquitoes were caught from 789 LTC; 26 134 Anopheles gambiae s.l., 615 A. funestus, 718 other anophelines and 119 981 culicines. More than 60% of the total A. gambiae s.l. were found in five (0.6%) LTCs, with a maximum of 5889 caught in a single trap. Of 505 A. gambiae s.l. speciated by polymerase chain reaction, 91.5% were found to be A. arabiensis. Plasmodium falciparum sporozoite enzyme-linked immunosorbent assay tests were performed on 10 108 anopheles mosquitoes and 39 (0.38%) were positive. Entomological inoculation rate (EIR) estimates were generated using a standard method and an alternative method that allows the calculation of confidence intervals based on a negative binomial distribution of sporozoite positive mosquitoes. Overall EIR estimates were similar; 31 vs. 29 [95% confidence interval (CI): 19, 44] infectious bites per annum, respectively. The EIR ranged from 4 (95% CI: 1, 17) in the cool season to 108 (95% CI: 69, 170) in the wet season and from 54 (95% CI: 30, 97) in the east of the town to 15 (95% CI: 8, 30) in the town centre. These estimates show large variations over short distances in time and space. They are all markedly lower than those reported from nearby rural areas and for other parts of Tanzania
High speed visualizations of the cavitating vortices of 2D mixing layer
No full textThe present study investigates experimentally vortex dynamics of a cavitating two-dimensional mixing layer at a high Reynolds number in order to determine the effect of growth and collapse of cavitation.
The dynamics and the topology of the vorticity regions corresponding to the low pressure area where cavitation effects take place are studied from the single phase state to highly cavitating conditions. LDV techniques are used in order to characterize the pattern of the turbulent single phase flow. Highspeed visualizations have been performed using a specific image processing of time series to highlight the behaviour and dynamics of the vapour phase. Visualizations, image processing and statistical analysis enable the estimation of the convective velocity and the shedding frequency of the cavitating Kelvin–Helmholtz vortices. The measured visual vapour thickness grows linearly as the Kelvin–Helmholtz instability develops and its expansion rate stays constant for the range of cavitation levels studied. The vortex pairing phenomenon is also analysed. Results show that the spatial development of the mixing area is slightly affected by the vapour phase allowing a self-similar behaviour of the mean motion
Cultura Organizativa: ¿Cómo de conscientes son los empleados?, caso: Jamones Juan Gargallo S.L.
No full text[EN] The goal of this thesis is to describe the current organizational culture of Jamones Juan Gargallo Ltd and improve the staff´s understanding of it. Face-to-face interviews are conducted and the Hofstede Multi-Focus Model (Waisfisz,2015) is applied in the case study company. The author expects that this study can help Jamones Juan Gargallo Ltd to find out how to improve the corporate culture and help the employees to be more aware of their culture. However, the results can be only applied to this particular case and cannot be generalized.[ES] El presente trabajo consistirá en describir la actual cultura organizativa de Jamones Juan Gargallo S.L. con el objetivo de mejorar el entendimiento entre sus empleados. Para ello, se llevarán a cabo entrevistas al personal y para su análisis será empleado el modelo de las cinco dimensiones de Hofstede (Waisfisz,2015). El autor espera que este estudio ayude a Jamones Juan Gargallo S.L. a detectar sus debilidades en este ámbito y así poder mejorar su cultura en la organización y como consecuencia ser más conscientes de ella. Sin embargo, los resultados obtenidos solo podrán ser aplicados en este caso particular y no ser generalizados.Casas Morente, B. (2017). Cultura Organizativa: ¿Cómo de conscientes son los empleados? Caso: Jamones Juan Gargallo S.L. https://riunet.upv.es/handle/10251/92815TFG
A significant increase in kdr in Anopheles gambiae is associated with an intensive vector control intervention in Burundi highlands.
No full textOBJECTIVES AND METHODS: In Burundi, the occurrence of the knock down resistance (kdr) mutation in Anopheles gambiae sensu lato (s.l.) was determined for six consecutive years within the framework of a vector control programme. Findings were also linked with the insecticide resistance status observed with bioassay in An. gambiae s.l. and An. funestus. RESULTS: The proportion of An. gambiae s.l. carrying the East Leu-Ser kdr mutation was 1% before the spraying intervention in 2002; by 2007 it was 86% in sprayed valleys and 67% in untreated valleys. Multivariate analysis showed that increased risk of carrying the kdr mutation is associated with spraying interventions, location and time. In bioassays conducted between 2005 and 2007 at five sites, An. funestus was susceptible to permethrin, deltamethrin and DDT. Anopheles gambiae s.l. remained susceptible or tolerant to deltamethrin and resistant to DDT and permethrin, but only when kdr allele carriers reached 90% of the population. CONCLUSIONS: The cross-resistance against DDT and permethrin in Karuzi suggests a possible kdr resistance mechanism. Nevertheless, the homozygous resistant genotype alone does not entirely explain the bioassay results, and other mechanisms conferring resistance cannot be ruled out. After exposure to all three insecticides, homozygote individuals for the kdr allele dominate among the surviving An. gambiae s.l. This confirms the potential selection pressure of pyrethroids on kdr mutation. However, the high occurrence of the kdr mutation, even at sites far from the sprayed areas, suggests a selection pressure other than that exerted by the vector control programme
to which is prefixed a short answer to Volney's contradictions on Ali-Bey's history and revolt ...
No full texttranslated from the original into English by the author. to which is prefixed a short answer to Volney's contradictions on Ali-Bey's history and revolt ... / by S.L. [Sauveur Lusignan] KosmopolitesBd. 2, Paginierung springt von S. 254 auf S. 25
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