198,513 research outputs found
Particle image velocimetry studies on shock wave diffraction with freestream flow
No full textThe current study presents the effects of a diffracted shock wave interacting with a parallel freestream. The experiments were carried out with diaphragm pressure ratio of P4/P1 = 12, where P 4 and P1 are the driver and driven pressures of the shock tube. Air was used as both the driver and test gas. Freestream velocities of Ufs = 120, 140 and 180 m/s were examined. Particle Image Velocimetry (PIV) was used to quantify the velocity and vorticity fields due to the interaction of unsteady and steady flows. Visualization of the flow features was carried out using the high-speed schlieren photography. The pressure reduction with the highest freestream flow was of 8%, due to the attenuation of the shock/vortex interactions was recorded. Copyright © 2010 by N. Gongora-Orozco, H. Zare-Behtash and K.Kontis
ROTATIONAL ANALYSIS OF THE Nak FLUORESCENCE SERIES EXCITED BY AN ARGON ION LASER
No full textAuthor Institution: Department of Chemistry, Columbia University; Quantum Electronics Division, National Bureau of StandardsNaK molecules contained in a heat pipe oven have been excited by various lines of a cw argon ion laser and the resulting fluorescence series have been photographed with a 3.4 m Using the technique of collision-induced the following assignments are made: [FIGURE] In order to obtain the upper and lower states’ molecular constants, all the measured line positions are fit simultaneously to the calculated line position given by the difference between the Dunham expansions for the two states. The vibrational and rotational constants will be J. Toueg, R. N. Zare, and M. M. Hessel, Twenty-Seventh Symposium of Molecular Spectroscopy (Abstract 2) (1972). R. Velasco, Ch. Ottinger, and R. N. Zare, J. Chem. Phys. 51, 5522 (1969). M. M. Hessel, Phys. Rev. Letters 26, 215 (1971)
Density modulo 1 of a sequence associated to some multiplicative functions evaluated at polynomial arguments
No full textWe study density modulo 1 of the sequence with general term ∑ m≤n f (G(m)) where f is the strongly multiplicative function of the form f (n) = ∏ p|n (1 − ν(p) p) and ν is a multiplicative function for which there exists a real number 0 < r ≤ 1 such that 1 ≤ |ν(p)| ≤
Trade credit
Full text linkThis dissertation develops a new tractable solution method to calculate the set of equilibrium outcomes for a broad variety of dynamic economic models. These outcomes---players' payoffs in repeated games, continuation values of agents in recursive contracts, or the set of stationary distributions in recursive competitive equilibria---are given by the fixed-points of a class of set-valued contraction mapping operators.
I then use the method to analyze a dynamic model of trade credit. This model features a principal/seller of an intermediate good who repeatedly sells on credit and lacks collateral to a cash-constrained buyer/agent who receives new history dependent private information each period and takes private and public actions, including, possibly, defaulting on his debt.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-12-01The student, Meysam Zare, accepted the attached license on 2019-12-05 at 13:06.The student, Meysam Zare, submitted this Dissertation for approval on 2019-12-05 at 13:21.This Dissertation was approved for publication on 2019-12-06 at 07:57.DSpace SAF Submission Ingestion Package generated from Vireo submission #14717 on 2020-02-28 at 17:38:02Made available in DSpace on 2020-03-02T22:38:57Z (GMT). No. of bitstreams: 2
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Previous issue date: 2019-12-06Embargo set by: Seth Robbins for item 114036
Lift date: 2022-03-02T22:39:04Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemLimited Restriction Lifted for Item 114036 on 2022-03-03T10:15:25Z
Orobanche turcica G. Zare & Donmez 2014, sp. nov.
No full text<i>Orobanche turcica</i> G.Zare & Dönmez, <i>sp. nov.</i> (Figure 1) <p> <b>Type:</b> — TURKEY. Marash [Kahramanmaraş]: distr. Gokaun [Göksun]: Hobek [Höbek] mountain, 2000 m on <i>Salvia</i>, 21 June 1952, <i>Davis 20192- Dodds & Çetik</i>, (holotype E!, isotypes BM!, K!, ANK!). The collection we propose as holotype from Edinburgh has three duplicates in K, BM and ANK. We chose the specimen from E because P.H. Davis kept the original collection in E and sent duplicates to other herbaria.</p> <p> <b>Diagnosis:</b> —This species is similar to <i>Orobanche anatolica</i> in habit, dense inflorescence, bract indumentum, seed surface ornamentation and pollen type. It differs by having a gamosepalous calyx with 4 equal teeth, a pale pinkish-brown corolla with a straight dorsal line, corolla lobes that are lanate on the inner side, and stamens inserted 5–6 mm above the base of corolla.</p> <p>Stem simple, 12–45 cm long, 5–10 mm wide at middle, slender, dark red or brown, glandular-pubescent. Scales 15–25 × 4–8 mm, narrowly ovate or lanceolate. Inflorescence 6–24 × 3.5–5.5 cm, cylindrical to lanceolate, longer than or equal to the remaining part of the stem, dense (25–45 flowers), with erect flowers. Bract 15–25 × 5–7 mm, narrowly ovate to lanceolate, red-brown, densely glandular pubescent, in the lower part of the inflorescence equal to or shorter than the corolla, bracts in the upper part of the inflorescence equal to or longer than the corolla. Calyx 15–22 mm long, gamosepalous in dorsal part for up to 1 cm, with 4 or rarely 5 equal teeth; calyx teeth 6–17 mm, lanceolate to linear, with a conspicuous middle vein. Corolla 25–35 mm long, tubular or campanulate, slightly inflated above the insertion of stamens, pale pink or yellow, with a straight dorsal line; lobes of the upper lip acute, deflexed; lobes of the lower lip 5–6 mm, ovate, acute, serrate at margin, deflexed; corolla lobes covered with lanate hairs on the inner side and glandular hairs on the outside, ciliate-pilose at margin. Stamens inserted 5–6 mm above the base of corolla-tube; filaments 10–16 mm long, densely pubescent at base; anthers conspicuously mucronate, 3 mm long, woolly. Pollen heteromorph (inaperturate, tricolpate or dicolpate); P 23.57 ± 1.03 μm, E 23.82 ± 0.98 μm, pollen shape (P/E) oblatespheroidal; exine thickness ca. 1 μm; intine ca. 1 μm or less thick, perforate. Ovary 5–6 mm long, elliptic; style 10–16 mm long, sparsely glandular-pubescent. Capsule 8–12 × 4–6 mm. Seed ovate, oblong or pear shaped, 0.495 ± 0.046 × 0.288 ± 0.019 mm, brown; seed ornamentation reticulate, with isodiametric or irregular polygonal cells, their number 6–8 in one line; ornamentation of the periclinal walls smooth.</p> <p>Flowering and fruiting time June to July.</p> <p> <b>Etymology:</b> —The specific epithet refers to Turkey, where the specimens have been collected from.</p> <p> <b>Habitat:—</b> Subalpine meadows, elevation 1400–2000 m. Host: <i>Salvia</i> (Lamiaceae) and probably <i>Onosma</i> (Boraginaceae).</p> <p> <b>Distribution:</b> — Turkey, endemic to the Irano-Turanian phytogeographic region.</p> <p> <b> Examined specimens of <i>Orobanche turcica</i>:</b> — TURKEY.A3 Bolu: Gölcük, Sünnet lake, under <i>Pinus nigra</i> forest, 13 July 2009, host <i>Onosma, Ali A. Dönmez 15903</i> (HUB!). B3 Isparta: Kızıl Dağ National Park, 1600–1700 m, 25 June 1994, <i>B. Mutlu 922</i> (HUB!). B5 Niğde: Hasan Dağı, above Taşpınar. c. 1300 m, 15 June 1952, <i>Davis 18905, Dodds & Çetik</i> (K!). B7 Malatya: Venk, Tavşan hill, limestone, 1400–1600 m, 7 July 1996, <i>B. Yıldız 13691</i> (INU!). B9 Bitlis: N. flank of Nemrut mountain, 1830 m, 3 June 1954, Flowers pale yellow, <i>Davis 23597</i> and <i>O. Polunin</i> (BM!, ANK!).</p>Published as part of <i>Zare, Golshan & Dönmez, Ali A., 2014, A new species of Orobanche (Orobanchaceae) from Turkey, pp. 148-154 in Phytotaxa 184 (3)</i> on pages 151-153, DOI: 10.11646/phytotaxa.184.3.4, <a href="http://zenodo.org/record/5146644">http://zenodo.org/record/5146644</a>
A unified seismic catalog for the Iranian plateau (1900-2011)
No full textThe first seismograph in Iran was installed in 1959, and this
marked the beginning of the national seismic catalog. The seismic
network grew with years, but its coverage, the instrumental
features, and the details of magnitude calculation changed over
time, resulting in a highly heterogeneous national seismic
catalog.
In this work, we present a unified and homogeneous catalog
for the Iranian plateau (Mw ≥4), created by merging data
from two local catalogs and seven international agencies, each
one covering the magnitude scale and period illustrated in
Figure 1. This operation requires the conversion of different
magnitudes used by the single agencies to a common type.
The moment magnitude (Mw) is chosen as reference for its
physical meaning (Kanamori, 1977) and because it does not
saturate. In this attempt to convert different magnitude scales
to Mw, regression relations that take into account errors on
both variables are used, and a specific statistical analysis shows
that the region under study (24°N–42°N, 43°W–66°E) is
better described when subdivided into two tectonic domains,
Zagros and Alborz–Central Iran, characterized by different regression
relations. A precedence scheme is then established to
select the magnitude value to be preferred when the same event
is reported by several catalogs with different magnitude scales
and/or values. The resulting unified catalog for the Iranian plateau,
spanning 1900–2011, is finally presented also in a declustered
form for time-independent seismic hazard estimates
Re-assessing the intensity values of Iranian earthquakes using EMS and ESI scales
No full textIran is a region with high seismicity but reliable seismometric networks were installed in this country only in the last decades. Hence, the analysis of macroseismic effects (seismic intensity) could be the only possible way for defining the parameters of most Iranian earthquakes. Various authors reported the intensity estimates of earthquakes in this region using different macroseismic scales. To apply modern methods of determining macroseismic parameters, intensity values need to be expressed in a uniform scale. In this study, we attempt such homogenization by considering all information we can find from the literature consisting of both descriptions of effects and intensity values to build a dataset of intensities for the Iran region as most complete as possible. We adopted the European Macroseismic Scale (EMS) as the reference scale as it is the most recent one and particularly detailed on building damage. We also considered the Environmental Seismic Intensity (ESI) scale in order to use information on environmental effects (ground deformation, landslides, liquefaction, etc.) that are poorly detailed by EMS. We compare our application of two scales based on a dataset of Iranian earthquakes for which we have descriptions of effects on both building (EMS) and environment (ESI), and found that, in about 80% of cases, assessed EMS and ESI intensities coincide one to other within one degree, that is the uncertainty which can be reasonably assumed for standard intensity estimates. In cases where we were not able to find the original descriptions of effects in literature and only intensity estimates reported in various scales, we convert these values by table of correspondence. In summary, we assessed intensities in a homogeneous scale for 512 Iranian earthquakes from 658 through 2013
Data for: In Vivo Confocal Microscopy for Monitoring Treatment of Ocular Surface Squamous Neoplasia with Topical Interferon Alfa-2b
No full textRaw data (SPSS
Efecto in vitro de componentes de aceites esenciales sobre Pochonia chlamydosporia var. catenulata (Goddard) Zare & Gams y Lecanicillium lecanii (Zim.) Zare & Gams
Full text linkThe aim of this study was to determine the in vitro effect of components of essential oils such as camphor, camphene, piperitone and safrole against the fungal biological control agents Pochonia chlamydosporia var. catenulata (Goddard) Zare & Gams and Lecanicillium lecanii (Zim.) Zare & Gams. The study was carried out using the method of serial dilutions in liquid medium, and concentrations of 1.25, 2.5 and 5 mg.ml-1 of the chemicals were used. Camphor and camphene were not toxic to fungi in the evaluated range of concentrations. Piperitone and safrole can be used at concentrations lower than 2.5 mg.ml-1 for L. lecanii and lower than or at 5 mg.ml-1 for P. chlamydosporia var. catenulata or applied at different times of treatment. Key words: camphor, camphene, piperitone, safrole, Pochonia chlamydosporia var. catenulata, Lecanicillium lecanii.El objetivo de este trabajo fue determinar el efecto in vitro de componentes de aceites esenciales como alcanfor, canfeno, piperitona y safrol sobre los hongos controles biológicos: Pochonia chlamydosporia var. catenulata (Goddard) Zare & Gams y Lecanicillium lecanii (Zim.) Zare & Gams. Para el estudio se utilizó el método de las diluciones seriadas en medio líquido y se emplearon concentraciones de 1,25; 2,5 y 5 mg.ml-1 de las sustancias químicas. El alcanfor y el canfeno no fueron tóxicos a los hongos en el rango de concentraciones evaluado. Se pueden usar piperitona y safrol a concentraciones inferiores a 2,5 mg.ml-1 para L. lecanii y menores o igual a 5 mg.ml-1 para P. chlamydosporia var. catenulata, o aplicarse en momentos diferentes del tratamiento. Palabras clave: alcanfor, canfeno, piperitona, safrol, Pochonia chlamydosporia var. catenulata, Lecanicillium lecanii
Improving the aerodynamic performance of a cycloidal rotor through active compliant morphing
No full textCycloidal rotors are a novel form of propulsion system that can be adapted to various forms of transport such as air and marine vehicles, with a geometrical design differing significantly from the conventional screw propeller. Research on cycloidal rotor design began in the early 1930s and has developed throughout the years to the point where such devices now operate as propulsion systems for various aerospace applications such as micro air vehicles, unmanned air vehicles and compound helicopters. The majority of research conducted on the cycloidal rotor’s aerodynamic performance have not assessed mitigating the dynamic stall effect, which can have a negative impact on the rotor performance when the blades operate in the rotor retreating side. A solution has been proposed to mitigate the dynamic stall effect through employment of active, compliant leading-edge morphing. A review of the current state of the art in this area is presented. A two-dimensional, implicit unsteady numerical analysis was conducted using the commercial computational fluid dynamics software package STAR CCM+, on a two-bladed cycloidal rotor. An overset mesh technique, otherwise known as a chimera mesh, was used to apply complex transient motions to the simulations. Active, compliant leading-edge morphing is applied to an oscillating NACA 0015 aerofoil to attempt to mitigate the dynamic stall whilst maintaining the positive dynamic lift coefficient (Cl) contributions. It was verified that by applying a pulsed input leading-edge rotational morphing schedule, the leading-edge vortex does not fully form and the large flow separation is prevented. Further work in this investigation will focus on coupling the active, leading-edge motion to the cycloidal rotor model with the aim to maximise aerodynamic performance
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