1,289 research outputs found
Development 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
Bombus (Alpigenobombus) angustus Chiu 1948
No full text<p> 11. <b> <i>Bombus</i> (<i>Alpigenobombus</i>) <i>angustus</i></b> Chiu, 1948</p> <p>Figs 104‒105</p> <p> <i>Bombus</i> (<i>Alpigenobombus</i>) <i>angustus</i> Chiu, 1948: 59.</p> Species-taxon concept and variation <p> Evidence for the taxon concept of the species <i>B.angustus</i> here provides further support for the interpretation (Williams <i>et al.</i> 2022b) that this is separate from the taxon concept of the species <i>B. breviceps</i> (Williams 1998), based on: (1) our PTP analysis supports independent species-level coalescents in the COI gene (Fig. 12); corroborated by (2) diagnostic morphological character states (see the keys).</p> <p> The PTP and morphological results (Fig. 12, keys) support the interpretation that <i>B. angustus</i> and <i>B. breviceps</i> are separate species (Williams <i>et al.</i> 2022b). The available COI-barcode-like sequences may all be low-divergence neonumts (Fig. 11).</p> <p> The female mandible of <i>B. angustus</i> has been imaged by Starr (1992: fig. 6a).</p> <p> No substantial colour-pattern variation of <i>B. angustus</i> is known (Figs 104‒105). <i>Bombus angustus</i>, with its black with red-tailed colour pattern from Taiwan, appears to mimic the commoner local <i>B.</i> (<i>Megabombus</i>) <i>trifasciatus</i> Smith, 1852 (Williams 2007: fig. 5e).</p> Type material <p> <i>Bombus</i> (<i>Alpigenobombus</i>) <i>angustus</i> Chiu, 1948: 59. Holotype by original designation: ♁ Taiwan (TARI). Photographic images examined.</p> Morphological diagnosis <p> <b>Female</b></p> <p> Wings very weakly clouded with brown, nearly clear, with the veins dark brown (cf. <i>B. genalis</i>, <i>B. breviceps</i>, <i>B. grahami</i>), hair of medium length, oculo-malar area shorter than broad, clypeus in its central area with many small punctures (cf. <i>B. genalis</i>, <i>B. grahami</i>); mid and hind tibiae with the exoskeleton and hair predominantly black, hair of the thoracic dorsum and T1‒3 black, T4‒6 orange-red.</p> <p> <b>Male</b></p> <p>Examined from photographic images, also described and genitalia illustrated by Chiu (1948: fig. 1) (genitalia of the type not found by C.-F. Lee, pers. com.): wings very weakly clouded with brown, nearly clear, with the veins light brown; genitalia with the gonostylus nearly equally short on both its outer side and its inner side but with the distal lobe projecting inwards as a long broadly triangular pointed process; hair of the thoracic dorsum and T1‒3 ‘black’ (on the type specimen, which is in poor condition, hair of the thorax in part?faded to brown), T4‒7 orange-red.</p> Material sequenced in Fig. 12 <p>TAIWAN • 1 ♀ (worker); Chiayi, Alishan; [23.446° N, 120.794° E]; 14 Jul. 2020; Y. Lin leg.; GenBank seq: MZ831894; TFRI: AG#074.</p> Global distribution <p> Taiwan endemic (Williams <i>et al.</i> 2022b): PW, TARI, TFRI.</p> <p> This is a rare species with few individuals recorded: Chiu (1948) lists three individuals from three localities; Starr (1992) lists 21 individuals from eight localities (mapped in Starr: fig. 7) among a total sample of 4555 Taiwanese bumblebees (<0.5%; from his map fig. 7, most <i>B. angustus</i> appear to be from elevations around 1000‒2000 m, although one individual in the north may be from ca 100 m).</p> Behaviour <p>Male behaviour not seen.</p>Published as part of <i>Williams, Paul H., An, Jiandong, Dorji, Phurpa, Huang, Jiaxing, Jaffar, Saleem, Japoshvili, George, Narah, Jaya, Ren, Zongxin, Streinzer, Martin, Thanoosing, Chawatat, Tian, Li & Orr, Michael C., 2023, Bumblebees with big teeth: revising the subgenus Alpigenobombus with the good, the bad and the ugly of numts (Hymenoptera: Apidae), pp. 1-65 in European Journal of Taxonomy 892 (1)</i> on pages 47-48, DOI: 10.5852/ejt.2023.892.2283, <a href="http://zenodo.org/record/8382675">http://zenodo.org/record/8382675</a>
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
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
Age-related Differences In Metabolites In The Anterior And Posterior Cingulate Cortices Of The Aging Brain
No full textAging of the human brain is the common predisposing factor of neurodegenerative diseases. It is the primary risk factor for Alzheimer’s disease and other prevalent neurodegenerative disorders. Proton magnetic resonance spectroscopy (1H-MRS) is a non-invasive clinical tool which can measure in vivo metabolite levels by using proton signals from the metabolites. N-acetyl-aspartate (NAA) and Glx [summation of glutamate (Glu) and glutamine (Gln)] are examples of metabolites which can be measured and quantified by 1H-MRS. NAA is a well-known marker specific for mature neurons. Glx, which has an interesting role in aging, could be used as a central measure for glutamatergic neurotransmission by assessing the entire brain pool of Glu and Gln. Both NAA and Glx have been suggested for measures of energy metabolism, and can serve as neurochemical fingerprints of neural activites in the brain. As the anterior cingulate cortex has recently become a focus for aging research because of its implicated role in attention and mood regulation, we evaluated any changes in neural tissue composition with aging, as measured by absolute quantification of metabolites such as choline, creatine, NAA, Glx, and myo-inositol using 1H-MRS at 3 T. The findings and future directions will be discussed from various perspectives
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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