1,519 research outputs found
Evaluating the effectiveness of overstory cover as a surrogate for bird community diversity and population trends
No full textDevelopment Of A Preliminary Lifing Analysis Tool For The F135-PW-100 Engine
No full textIn the near future the Royal Netherlands Air Force will replace their fleet of F-16’s with the F-35. In the past the NLR has aided the Air Force with life cycle and deterioration analysis work on the F100-PW-220 engine, which powers the F-16. Understanding the physical system of the engine allows for on-condition maintenance. The same is preferred for the F135-PW-100 engine powering the F-35. Therefore, a preliminary lifing analysis tool has been developed for the F135-PW-100 engine rotor blades, based on open source literature. Aerospace Engineerin
0.85 PW laser operation at 3.3 Hz and high-contrast ultrahigh-intensity λ = 400 nm second-harmonic beamline
No full textWe demonstrate the generation of 0.85 PW, 30 fs laser pulses at a repetition rate of 3.3 Hz with a record average power of 85 W from a Ti:sapphire laser. The system is pumped by high-energy Nd:glass slab amplifiers frequency doubled in LiB3O5 (LBO). Ultrahigh-contrast λ = 400 nm femtosecond pulses were generated in KH2PO4 (KDP) with>40% efficiency. An intensity of 6.5 × 1021 W∕cm2 was obtained by frequency doubling 80% of the available Ti:sapphire energy and focusing the doubled light with an f∕2 parabola. This laser will enable highly relativistic plasma experiments to be conducted at high repetition rate
Shifting attention in viewer- and object-based reference frames after unilateral brain injury
No full textThe aims of the present study were to investigate the respective roles that object- and viewer-based reference frames play in reorienting visual attention, and to assess their influence after unilateral brain injury. To do so, we studied 16 right hemisphere injured (RHI) and 13 left hemisphere injured (LHI) patients. We used a cueing design that manipulates the location of cues and targets relative to a display comprised of two rectangles (i.e., objects). Unlike previous studies with patients, we presented all cues at midline rather than in the left or right visual fields. Thus, in the critical conditions in which targets were presented laterally, reorienting of attention was always from a midline cue. Performance was measured for lateralized target detection as a function of viewer-based (contra- and ipsilesional sides) and object-based (requiring reorienting within or between objects) reference frames. As expected, contralesional detection was slower than ipsilesional detection for the patients. More importantly, objects influenced target detection differently in the contralesional and ipsilesional fields. Contralesionally, reorienting to a target within the cued object took longer than reorienting to a target in the same location but in the uncued object. This finding is consistent with object-based neglect. Ipsilesionally, the means were in the opposite direction. Furthermore, no significant difference was found in object-based influences between the patient groups (RHI vs. LHI). These findings are discussed in the context of reference frames used in reorienting attention for target detection
Islam and Muslim Identities in Four Contemporary British Novels
No full textThe aim of the dissertation is to explore how Islam is depicted and Muslim identities are constructed in four representative works of contemporary British fiction: Hanif Kureishi’s The Black Album, Monica Ali’s Brick Lane, Fadia Faqir’s My Name is Salma, and Leila Aboulela’s Minaret. Salman Rushdie’s The Satanic Verses is also discussed in terms of its crucial role in fostering what some Muslims might consider polemical and stereotypical positions in writing about Islam. The term ‘Islamic postcolonialism’ provides the theoretical underpinning to the thesis. Islamic postcolonialism is a theoretical perspective that combines two components which have up until now existed in a state of tension. As a secular theory, postcolonialism has notably failed to account for Muslim priorities; it has, for instance, had severe problems critiquing the anti-Islam polemics of The Satanic Verses, as is evidenced by Edward Said’s support for Rushdie, in spite of his criticism of the stereotypical representation of Islam and Muslims in the West. Islamic postcolonialism applies the anti-colonial resistant methodology of postcolonialism from a Muslim perspective, exploring the continuance of colonial discourse in part of the contemporary western writing about Islam and Muslims.
Applying Islamic postcolonialism to the novels in question, the thesis tests the following questions: 1. How are Islam and Muslims depicted in the novels discussed? 2. Is the depiction of Islam similar to, and if so in what ways, its depiction in the literature of the colonial period? 3. Is there a connection between the writer’s personal
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religious commitment and the image of Islam and Muslims he/she inscribes in the novel? The four novels are then classified according to three categories: Hanif Kureishi’s The Black Album and Monica Ali’s Brick Lane depict Islam and Muslims stereotypically, from a partially colonial perspective. Secondly, Fadia Faqir’s My Name is Salma adopts a mixed colonial and postcolonial depiction of Islam and Muslims. While it depicts the centrality of Islam in a Muslim society (Hima, Jordan) stereotypically, the novel appears more sympathetic in imaging Islam in England under the conditions of the personal and the marginal. Thirdly, Leila Aboulela’s novel Minaret is the one text that complies with an Islamic postcolonial perspective. The failure of secularism and re-emergence of Islam in the Arab world is, Waïl Hassan contends, the background to the achievement of Aboulela’s fiction. Her image of Islam and Muslims is unique in British fiction as it provides a new depiction of these categories from the standpoint of a more authentic Muslim voice. Minaret, it is argued, is an Islamic postcolonial novel both because it celebrates Islam, and because Najwa adopts Islam as her first identity in metropolitan London, which once represented the colonial centre from which her native Sudan was colonised
The HP0256 gene product is involved in motility and cell envelope architecture of <it>Helicobacter pylori</it>
No full textAbstract Background Helicobacter pylori is the causative agent for gastritis, and peptic and duodenal ulcers. The bacterium displays 5-6 polar sheathed flagella that are essential for colonisation and persistence in the gastric mucosa. The biochemistry and genetics of flagellar biogenesis in H. pylori has not been fully elucidated. Bioinformatics analysis suggested that the gene HP0256, annotated as hypothetical, was a FliJ homologue. In Salmonella, FliJ is a chaperone escort protein for FlgN and FliT, two proteins that themselves display chaperone activity for components of the hook, the rod and the filament. Results Ablation of the HP0256 gene in H. pylori significantly reduced motility. However, flagellin and hook protein synthesis was not affected in the HP0256 mutant. Transmission electron transmission microscopy revealed that the HP0256 mutant cells displayed a normal flagellum configuration, suggesting that HP0256 was not essential for assembly and polar localisation of the flagella in the cell. Interestingly, whole genome microarrays of an HP0256 mutant revealed transcriptional changes in a number of genes associated with the flagellar regulon and the cell envelope, such as outer membrane proteins and adhesins. Consistent with the array data, lack of the HP0256 gene significantly reduced adhesion and the inflammatory response in host cells. Conclusions We conclude that HP0256 is not a functional counterpart of FliJ in H. pylori. However, it is required for full motility and it is involved, possibly indirectly, in expression of outer membrane proteins and adhesins involved in pathogenesis and adhesion.</p
Supplementary Data: Spectral Control via Multi-Species Effects in PW-Class Laser-Ion Acceleration
No full textSupplementary materials for our paper "Spectral Control via Multi-Species Effects in PW-Class Laser-Ion Acceleration".
Additional high-resolution, raw HDF5 files using the openPMD standard (DOI:10.5281/zenodo.1167843) increase simulation output data to 4.7 TByte and are available from the corresponding author upon reasonable request.This project received funding within the MEPHISTO project (BMBF-Förderkennzeichen 01IH16006C)
Wall-pressure-velocity transfer kernel in high Reynolds number turbulent channel flows
No full textSince wall-pressure fluctuations would form a practically-robust input to a real-time active controller of wall-bounded turbulence, it is of high practical interest to study the scaling behavior of the wall-pressure-velocity coupling. This work investigates the coupling of the wall-pressure fluctuations with the streamwise and wall-normal velocity fluctuations. Both the gain (or coherence) and phase spectra of the wall-pressure-velocity transfer kernel are assessed using a comprehensive database, available from direct numerical simulations of turbulent channel flow. With data spanning a decade in friction Reynolds number Reτ ∼ 550-5200, a 1D analysis (in terms of the streamwise wavelength, λx) reveals that the streamwise velocity and wall-pressure are most strongly coupled at a self-similar wall-scaling of λx/y ≈ 14. For the wall-normal velocity component, the strongest coupling appears at approximately half this ratio (λx/y ≈ 8.5). An analysis of the kernel's phase demonstrates that both the coherent fluctuations of streamwise and wall-normal velocity obey a forward-leaning inclination angle of α ≈ 30◦. When extending the analysis to 2D (as a function of λx and λz), the peak-coherence for pw and u still resides close to λx/y ≈ 14 and is reasonably symmetric around λx/λz = 2.3. The 2D coherence for pw and v peaks around λx/λz = 1.0. Both the 2D coherence for pw and u, and pw and v, adhere to a wall-scaling with y. Scaling behaviours identified in this work will aid the efficacy of real-time controllers, by for instance the implementation of data-derived FIR filters to only control velocity structures that are captured through wall-pressure measurements.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.Aerodynamic
Kościół katedralny pw. Wniebowzięcia Najświętszej Maryi Panny i Polonia w Charkowie: krótki szkic historyczny (XIX wiek)
No full textCathedral church of Assumptoin of the Blessed Virgin Marry a short historical draft (19th century). The author of the article presents a short outline of the cathedral church of Assumption of the Blessed Virgin Marry in Kharkiv since the moment it was built to its ceremonial cosercation in June 26, 1892 by the bishop of Molyhowska Diocese Albin Simon. Building of the church has been shown on the background of functioning of Polish community in Kharkiv in the 19th century which from a small group of believers managed transform into an important part of the citizens of the city. The cathedral church of Assumption of the Blessed Virgin Marry was a rock for Poles’ activities leaving in Kharkiv. The church survived till today and it adrous the city centre as an architectural jewel.Kościół katedralny pw. Wniebowzięcia Najświętszej Maryi Panny i Polonia w Charkowie: krótki szkic historyczny (XIX wiek). Autorka w przedstawionym artykule przybliża krótki zarys historii kościoła katedralnego pw. Wniebowzięcia Najświętszej Maryi Panny w Charkowie od czasu jego wzniesienia do chwili jego uroczystego poświęcenia 26 lipca 1892 roku przez biskupa pomocniczego diecezji mohylowskiej Franciszka Albina Simona. Budowa świątyni została ukazana na tle funkcjonowania w Charkowie w XIX wieku społeczności polskiej, która z niewielkiej garstki wiernych zdołała przekształcić się w niezwykle istotną część składową mieszkańców miasta. Ostoją dla działalności Polaków mieszkających w Charkowie był kościół katedralny pw. Wniebowzięcia Najświętszej Maryi Panny, który przetrwał do czasów obecnych, i dziś, jako perła architektury sakralnej, zdobi centrum miasta
Perikinetics and sludge study for the decontamination of petroleum produced water (PW) using novel mucuna seed extract
No full text© 2016, The Author(s). cc-by-nc-ndIn this study, Mucuna flagellipes seed extract was applied in the coagulation–flocculation of produced water (PW). Process parameters such as pH, dosage, and settling time were investigated. Process kinetics was also studied. Instrumental characterization of mucuna seed (MS), mucuna seed coagulant (MSC), and post effluent treatment settled sludge (PTSS) were carried out. The optimum decontamination efficiency of 95 % was obtained at 1 g/L MSC dosage, PW pH of 2, and rate constant of 0.0001 (L/g/s). Characterization results indicated that MS, MSC, and PTSS were of network structure, primitive lattice, and thermally stable. It could be concluded that MSC would be potential biomass for the treatment of produced water under the experimental conditions
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