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1
Huang, Ching-Yuang, Cher-Wei Chou, Shu-Hua Chen et Jia-Hong Xie. « Topographic Rainfall of Tropical Cyclones past a Mountain Range as Categorized by Idealized Simulations ». Weather and Forecasting 35, no 1 (31 décembre 2019) : 25–49. http://dx.doi.org/10.1175/waf-d-19-0120.1.
Texte intégralRésumé :
Abstract Topographic rainfall induced by westbound tropical cyclones past an island mountain is investigated using an idealized Weather Research and Forecasting (WRF) Model. Idealized simulations with varying vortex core size R (100–250 km), vortex intensity Vmax (20–35 m s−1), and steering wind speed U (4–10 m s−1) are conducted. The results show that the geometric distributions of major rainfall over the island are not greatly sensitive to cloud microphysics schemes using either single momentum or double momentum. Major rainfall is produced over northeastern and southwestern slopes of the mountain for smaller U. As U is doubled, the rainfall, however, is considerably weakened or is present only over southwestern slopes. For smaller U, a bifurcation of island rainfall with a sudden change in intensity or geometric shifting exists within a tiny range of R or Vmax. When the bifurcation occurs with small track deviations, geometric distributions of major rainfall are also more sensitive to cloud microphysics schemes. Such formation of bifurcation or double-peak rainfall, however, is significantly reduced when the terrain size is doubled. Systematic experiments are conducted to relate the topographical rainfalls over the northern half, southern half, and the whole of the mountain slopes to varying R, Vmax, and U. Larger U tends to produce much larger southern rainfall than northern rainfall. The average and maximum rainfalls generally increase with increased Vmax, except for large R. The decrease of average rainfall and maximum rainfall with increased U is more evident for smaller R, while not necessarily true for larger R.
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Bişgin, Mustafa Cemil. « Almost convergent sequence spaces derived by the domain of quadruple band matrix ». Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica 19, no 1 (1 décembre 2020) : 155–70. http://dx.doi.org/10.2478/aupcsm-2020-0012.
Texte intégralRésumé :
AbstractIn this work, we construct the sequence spaces f(Q(r, s, t, u)), f0(Q(r, s, t, u)) and fs(Q(r, s, t, u)), where Q(r, s, t, u) is quadruple band matrix which generalizes the matrices Δ3, B(r, s, t), Δ2, B(r, s) and Δ, where Δ3, B(r, s, t), Δ2, B(r, s) and Δ are called third order difference, triple band, second order difference, double band and difference matrix, respectively. Also, we prove that these spaces are BK-spaces and are linearly isomorphic to the sequence spaces f, f0 and fs, respectively. Moreover, we give the Schauder basis and β, γ-duals of those spaces. Lastly, we characterize some matrix classes related to those spaces.
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He, Guangxin, Gang Li, Xiaolei Zou et Peter Sawin Ray. « Applications of a Velocity Dealiasing Scheme to Data from the China New Generation Weather Radar System (CINRAD) ». Weather and Forecasting 27, no 1 (1 février 2012) : 218–30. http://dx.doi.org/10.1175/waf-d-11-00054.1.
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Abstract An improved velocity dealiasing algorithm is developed as an extension of the Next Generation Weather Radar (NEXRAD) dealiasing algorithm. The algorithm described in this paper is evaluated on selected China Next Generation Weather Radar (CINRAD) S-band radar radial velocity observations. This algorithm includes four modules for removing weak signals and determining the starting radial as a prelude to identifying and correcting aliased velocities. The proposed dealiasing algorithm was tested on 14 different weather systems, composed of typhoons, squall lines, and heavy rains. The results show that the algorithm is robust and stable for dealiasing S-band CINRAD radial velocity measurements. The performance levels for the typhoon and heavy rain cases are slightly better than for squall-line cases.
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Oun, Ameer Ghani Abd, et Mohammed Hamza Abass. « New Report of Stemphylium vesicarium (Wallr.) Simmons and Ulocladium alternariae (Cooke) Simmons as seed-borne fungi of wheat (Triticum aestivum L.) in Iraq ». IOP Conference Series : Earth and Environmental Science 1262, no 3 (1 décembre 2023) : 032030. http://dx.doi.org/10.1088/1755-1315/1262/3/032030.
Texte intégralRésumé :
Abstract The objective of the present study is to determine fungal species Stemphylium vesicarium and Ulocladium alternariae associated with seeds of five wheat cultivars called Wefia (WAF), Eba 99 (EBA), Adena (ADN), Bohooth (BTH) and Mahmoudia (MHD). Those fungi were identified by using morphological and microscopic features as well as molecular sequencing. Molecular identification was carried out relying on internal transcribed spacer primers (ITS1 and ITS4). This is a new report recording S. vesicarium and U. alternariae as seed-borne fungi of wheat seeds in Iraq.
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Moosa, Arwa A., et Raad Sami Fyath. « Toward Seven-Band Coherent WDM System Covering T to U Bands : Predictions of Transmission and BER Performance ». Al-Nahrain Journal for Engineering Sciences 27, no 1 (23 juin 2024) : 61–77. http://dx.doi.org/10.29194/njes.27010061.
Texte intégralRésumé :
This paper discusses the development of a seven-band coherent wavelength-division multiplexing (WDM) system covering the T to U systems, aiming to enhance the capacity and system efficiency. Seven multiband systems (C+L, S+C+L, S+C+L+U, E+S+C+L, E+S+C+L+U, O+E+S+C+L+U, and T+O+E+S+C+L+U) are designed with 40 GBaud symbol rate, 50 GHz channel spacing, and dual-polarization (DP)-16QAM signaling. The analysis adopted the enhanced Gaussian noise model, considering the amplified spontaneous emission of inline optical amplifiers and nonlinear interference (NLI) from fiber nonlinear optics, including Kerr effect and stimulated Raman scattering (SRS) which it implemented using Matlab (Ver. 2020b) program. The results show that the optimal powers are -4, -5, -5, -4.5, -3.5, -6, and -4.5 dBm for the seven WDM systems, respectively. Further, with a fiber span length of 100 km, the C+L system has the longest transmission reach of 20 span. However, using S+C+L+U system gives the highest bit rate-distance product of 1619 Tbps.km. The O+E+S+C+L+U and T+O+E+S+C+L+U systems are designed with 50 km-span length to reduce the effect of NLI caused by the large numbers of channels (1060 and 1200, respectively).
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Mahale, Vivek N., Jerald A. Brotzge et Howard B. Bluestein. « The Advantages of a Mixed-Band Radar Network for Severe Weather Operations : A Case Study of 13 May 2009 ». Weather and Forecasting 29, no 1 (1 février 2014) : 78–98. http://dx.doi.org/10.1175/waf-d-13-00024.1.
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Abstract Adding a mix of X- or C-band radars to the current Weather Surveillance Radar-1988 Doppler (WSR-88D) network could address several limitations of the network, including improvements to spatial gaps in low-level coverage and temporal sampling of volume scans. These limitations can result in missing critical information in highly dynamic events, such as tornadoes and severe straight-line wind episodes. To evaluate the potential value of a mixed-band radar network for severe weather operations, a case study is examined using data from X- and S-band radars. On 13 May 2009, a thunderstorm complex associated with a cold front moved southward into southwest Oklahoma. A tornado rapidly developed from an embedded supercell within the complex. The life cycle of the tornado and subsequent wind event was sampled by the experimental Collaborative Adaptive Sensing of the Atmosphere (CASA) radar testbed of four X-band radars as well as two operational WSR-88Ds. In this study, the advantages of a mixed-band radar network are demonstrated through a chronological analysis of the event. The two radar networks provided enhanced overall situational awareness. Data from the WSR-88Ds provided 1) clear-air sensitivity, 2) a broad overview of the storm complex, 3) a large maximum unambiguous range, and 4) upper-level scans up to 19.5°. Data from the CASA radars provided 1) high-temporal, 1-min updates; 2) overlapping coverage for dual-Doppler analysis; and 3) dense low-level coverage. The combined system allowed for detailed, dual- and single-Doppler observations of a wind surge, a mesocyclone contraction, and a downburst.
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SCHMIDT, A. A., et J. J. RODRÍGUEZ-NÚÑEZ. « EFFECT OF LOCAL CORRELATIONS ON s-WAVE SYMMETRY SUPERCONDUCTIVITY ». International Journal of Modern Physics C 11, no 06 (septembre 2000) : 1149–56. http://dx.doi.org/10.1142/s0129183100000924.
Texte intégralRésumé :
We derive superconducting mean-field equations for an attractive interaction V in the s-wave channel when local Coulomb interactions are taken into account for any value of U. Results show that Coulomb repulsion diminishes the critical temperature Tc to the order parameter Δ(T) for values of U ≥ |V|. Furthermore, the results are also quite sensible to band filling. In the presence of local correlations, 2Δ(0)/Tc differs from the BCS ratio since Coulomb interactions affect much more superconducting critical temperature Tc than superconducting order parameter Δ(T). Some consequences of our findings for experimental measurements in narrow band systems are discussed.
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Zeng, W., et R. Shen. « Andreev reflection of massive pseudospin-1 fermions ». New Journal of Physics 24, no 4 (1 avril 2022) : 043021. http://dx.doi.org/10.1088/1367-2630/ac614e.
Texte intégralRésumé :
Abstract We theoretically investigate the Andreev reflection of the massive pseudospin-1 Dirac fermions including the +U-type, the −U-type, and the S z -type mass terms, corresponding to the flat band locating at the top, the bottom, and the center of the band gap, respectively. For the ±U-type fermions, it is found that the Andreev reflection probability at the oblique incidence can be even larger than that at the normal incidence. For the retro-reflection, such an oblique enhancement occurs in the n-doped +U-type (p-doped −U-type) massive fermion systems. While for the specular reflection, the enhancement occurs in the n-doped −U-type (p-doped +U-type) systems. For the S z -type massive fermions, an ideal Andreev reflection with all-angle unit efficiency is predicted in an undoped junction with the incident energy equal to the superconducting gap.
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Tai, Sai-Choi, Edwin Wing-Lui Ginn et Chiu-Ying Lam. « Dual-Doppler Observations of Severe Tropical Storm Maggie 1999 ». Weather and Forecasting 20, no 1 (1 février 2005) : 112–23. http://dx.doi.org/10.1175/waf-828.1.
Texte intégralRésumé :
Abstract Severe Tropical Storm Maggie crossed Hong Kong, China, in June 1999. The dual-Doppler winds of Maggie captured by the Hong Kong Observatory's (HKO) S-band Doppler weather radar array were studied. The tracks of Maggie's vorticity centers at 1–3-km levels were analyzed and compared with that at the surface as determined from the wind observations of automatic weather stations. The results indicated that the storm had a vertical tilt toward the west to northwest during the transit over Hong Kong. The tracks also deviated significantly from the deep-layer environmental steering flow. The southward movement and vertical tilt could be partly attributed to the easterly vertical shear in the ambient flow. But the terrain of Hong Kong could have also played a significant role in the lowest 1 km of the atmosphere. The tendency of the storm track to avoid mountains was well illustrated and may serve as a useful forecasting guidance indicator for tropical areas with significant terrain. Experimental runs of a nonhydrostatic model at 5-km resolution were able to simulate the broad west-southwestward movement of Maggie and the vertical tilt of the circulation near the center of the tropical cyclone as revealed by the dual-Doppler observations.
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Li, Mengmeng, Jiangling Dou et Tao Shen. « Miniaturization of S-band circularly polarized microstrip antenna ». E3S Web of Conferences 360 (2022) : 01065. http://dx.doi.org/10.1051/e3sconf/202236001065.
Texte intégralRésumé :
A S-band miniaturized circularly polarized microstrip antenna is designed and fabricated. The curved current technique is utilized, and the effective path length of current is increased by loading the U-shaped slot on the radiating patch. Thus the antenna resonant frequency can be tuned and the antenna can be significantly miniaturized. The experimental samples of the antenna are fabricated and tested. The measured results show that the two resonant frequencies of the miniaturized S-band circularly polarized microstrip antenna are 2.17GHz and 2.25GHz, with an impedance bandwidth (S11 <−10 dB) of 152 MHz (from 2.132 GHz to 2.284 GHz). The measured gain is about 0dB. The measured results are basically consistent with the simulation results.
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Tuğ, Orhan, Vladimir Rakočević et Eberhard Malkowsky. « On the Domain of the Four-Dimensional Sequential Band Matrix in Some Double Sequence Spaces ». Mathematics 8, no 5 (13 mai 2020) : 789. http://dx.doi.org/10.3390/math8050789.
Texte intégralRésumé :
Let E represent any of the spaces M u , C ϑ ( ϑ = { b , b p , r } ) , and L q ( 0 < q < ∞ ) of bounded, ϑ -convergent, and q-absolutely summable double sequences, respectively, and E ˜ be the domain of the four-dimensional (4D) infinite sequential band matrix B ( r ˜ , s ˜ , t ˜ , u ˜ ) in the double sequence space E, where r ˜ = ( r m ) m = 0 ∞ , s ˜ = ( s m ) m = 0 ∞ , t ˜ = ( t n ) n = 0 ∞ , and u ˜ = ( u n ) n = 0 ∞ are given sequences of real numbers in the set c ∖ c 0 . In this paper, we investigate the double sequence spaces E ˜ . First, we determine some topological properties and prove several inclusion relations under some strict conditions. Then, we examine α -, β ( ϑ ) -, and γ -duals of E ˜ . Finally, we characterize some new classes of 4D matrix mappings related to our new double sequence spaces and conclude the paper with some significant consequences.
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Bukuya, Melinda, Teresa Martinelli, Joanne Tzouroutis, Elizabeth Duncan, Katie Welldon, Margaret Collecutt, Heather Aumann, Jim Thom, Grace Gilmore et Emmanuel Favaloro. « A Comparative Multi-laboratory Assessment of Three Factor VIII/von Willebrand Factor Concentrates ». Thrombosis and Haemostasis 87, no 03 (2002) : 466–76. http://dx.doi.org/10.1055/s-0037-1613027.
Texte intégralRésumé :
SummaryFive expert laboratories have participated in a cross-laboratory study to co-evaluate and compare three commercial Factor VIII/von Willebrand factor (VWF) concentrates. A total of nine factor concentrate lots were evaluated, comprising AHF (High Purity) (AHF HP; X3), Biostate® (X3) and Humate/Haemate (X3). All laboratories blind tested for FVIII:C, VWF:Ag and VWF:CB, four tested for VWF:RCo, and one performed VWF:Multimers. The study yielded inter-laboratory CVs for VWF:Ag and FVIII:C around 10–15%, and for VWF:CB and VWF:RCo around 20%, significantly lower than those of previous multi-laboratory surveys. All three lots of AHF HP contained in the vicinity of 25 U/ml FVIII:C, around 60–75 U/ml of VWF:Ag, but only 30–45 U/ml of VWF:CB and 40–50 U/ml of VWF:RCo (thus, CB/Ag ratio around 0.5–0.6 and RCo/Ag ratio around 0.6–0.7). Study determined that FVIII:C and VWF:RCo levels were similar to manufacturer assigned levels. Some loss of the high molecular weight (HMW) multimers was observed, together with an intense low molecular weight (LMW) VWF band consistent with some reduction or proteolysis of HMW VWF. All three lots of Humate/Haemate contained in the vicinity of 23–32 U/ml of FVIII:C, 70–105 U/ml of VWF:Ag, 50–90 U/ml of VWF:CB and VWF:RCo (i. e. CB/Ag ratio around 0.6–0.9 and RCo/Ag ratio around 0.6–1.1). Study-determined FVIII:C and VWF:RCo levels were similar to manufacturer-assigned levels. The LMW multimer band seen with AHF HP was also observed with Humate/Haemate. All three lots of Biostate contained in the vicinity of 40–55 U/ml of FVIII:C, 105–170 U/ml of VWF:Ag, 90–150 U/ml of VWF:CB, and 90–135 U/ml of VWF:RCo (i. e. CB/Ag and RCo/Ag ratios around 0.7–1.0). Study-determined FVIII:C levels were similar to manufacturer-assigned levels. The LMW multimer band seen with AHF HP was not observed with Biostate. The defined pattern of increasing CB/ Ag from AHF HP to Humate/Haemate and Biostate was consistently observed in study data from each of the five laboratories. In conclusion, study findings indicate some differences in the retention of functional/ HMW VWF between factor concentrates, and this is expected to have significant implications in terms of clinical efficacy for therapy in VWD.
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Amiot, Corey G., Lawrence D. Carey, William P. Roeder, Todd M. McNamara et Richard J. Blakeslee. « C-band Dual-Polarization Radar Signatures of Wet Downbursts around Cape Canaveral, Florida ». Weather and Forecasting 34, no 1 (10 janvier 2019) : 103–31. http://dx.doi.org/10.1175/waf-d-18-0081.1.
Texte intégralRésumé :
Abstract Wind warnings are the second-most-frequent advisory issued by the U.S. Air Force’s 45th Weather Squadron (45WS) at Cape Canaveral, Florida. Given the challenges associated with nowcasting convection in Florida during the warm season, improvements in 45WS warnings for convective wind events are desired. This study aims to explore the physical bases of dual-polarization radar signatures within wet downbursts around Cape Canaveral and identify signatures that may assist the 45WS during real-time convective wind nowcasting. Data from the 45WS’s C-band dual-polarization radar were subjectively analyzed within an environmental context, with quantitative wind measurements recorded by weather tower sensors for 32 threshold-level downbursts with near-surface winds ≥ 35 kt (1 kt ≈ 0.51 m s−1) and 32 null downbursts. Five radar signatures were identified in threshold-level downburst-producing storms: peak height of 1-dB differential reflectivity ZDR column, peak height of precipitation ice signature, peak reflectivity, height below 0°C level where ZDR increases to 3 dB within a descending reflectivity core (DRC), and vertical ZDR gradient within DRC. Examining these signatures directly in updraft–downdraft cycles that produced threshold-level winds yielded mean lead times of 20.0–28.2 min for cumulus and mature stage signatures and 12.8–14.9 min for dissipating stage signatures, with higher signature test values generally yielding higher skill scores. A conceptual test of utilizing signatures within earlier cells in multicell storms to indirectly predict the potential for intense downbursts in later cells was performed, which offered increased lead times and skill scores for an Eulerian forecast region downstream from the storm initiation location.
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Nigam, Padmini, Arjuna Muduli, Sandeep Sharma et Amrindra Pal. « Self-quadplexing slot antenna for S and C-band applications ». Computer Science and Information Technologies 3, no 2 (1 juillet 2022) : 74–81. http://dx.doi.org/10.11591/csit.v3i2.p74-81.
Texte intégralRésumé :
This paper demonstrates a novel kind of cavity-backed self-quadplexing slot antenna for the S and C-band applications. The proposed antenna consists of 4 distinct “U”-shaped slots of different lengths and produces the quad frequency band for wireless communication systems. These slots are excited through the separate and orthogonal placed microstrip feed lines of 50 Ω; generates four distinct operating bands at 3.2 GHz, 4.1 GHz, 5.8 GHz, and 7.2 GHz. Due to the perturbation of different U-shaped slots over the substrate integrated waveguide (SIW) cavity with defined positions, the high intrinsic port isolation value is better than 30.5 dB. Thus, the proposed unique antenna structure combines the four independent operating bands with minimum mutual coupling and negligible interference among input ports, which shows the self-quadplexing feature of the antenna. The proposed antenna also has the property of frequency tunability with uni-directional radiation pattern and gain of 5.8 dBi, 5.4 dBi, 4.01 dBi, and 3.47 dBi at corresponding operated frequency. The cross-polarization is 17.3 dB and the front-to-back ratio higher than 21.5 dB at all operating quad bands. There is a good agreement between simulated |S|-parameters results and equivalent circuit model results.
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Padmini Nigam, Arjuna Muduli, Sandeep Sharma et Amrindra Pal. « Self-quadplexing slot antenna for S and C-band applications ». Computer Science and Information Technologies 3, no 2 (1 juillet 2022) : 74–81. http://dx.doi.org/10.11591/csit.v3i2.pp74-81.
Texte intégralRésumé :
This paper demonstrates a novel kind of cavity-backed self-quadplexing slot antenna for the S and C-band applications. The proposed antenna consists of 4 distinct “U”-shaped slots of different lengths and produces the quad frequency band for wireless communication systems. These slots are excited through the separate and orthogonal placed microstrip feed lines of 50 Ω; generates four distinct operating bands at 3.2 GHz, 4.1 GHz, 5.8 GHz, and 7.2 GHz. Due to the perturbation of different U-shaped slots over the substrate integrated waveguide (SIW) cavity with defined positions, the high intrinsic port isolation value is better than 30.5 dB. Thus, the proposed unique antenna structure combines the four independent operating bands with minimum mutual coupling and negligible interference among input ports, which shows the self-quadplexing feature of the antenna. The proposed antenna also has the property of frequency tunability with uni-directional radiation pattern and gain of 5.8 dBi, 5.4 dBi, 4.01 dBi, and 3.47 dBi at corresponding operated frequency. The cross-polarization is 17.3 dB and the front-to-back ratio higher than 21.5 dB at all operating quad bands. There is a good agreement between simulated |S|-parameters results and equivalent circuit model results.
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Belhachi, S. « Electronic Structure for Europium Chalcogenides with Modified Becke–Johnson Potential Plus an On-Site Coulomb U (mBJ+U) ». SPIN 08, no 04 (décembre 2018) : 1850015. http://dx.doi.org/10.1142/s2010324718500157.
Texte intégralRésumé :
The full potential linearized-augmented-plane-wave (FP-LAPW) method is generalized to a case of an all-electron fully-relativistic spin-polarized self-consistent band calculation based on the relativistic spin-density functional theory and the modified Becke–Johnson potential (TB-mBJ) plus an on-site coulomb U employed for greater generation of the band gap. The results show that these materials are semiconducting materials. The indirect energy gap obtained in this calculation is 1.63[Formula: see text]eV, 1.79[Formula: see text]eV and 1.96[Formula: see text]eV for EuS, EuSe and EuTe, respectively. It is clear from the plots that LSDA[Formula: see text][Formula: see text][Formula: see text]U is a poor technique for the calculation of the band gaps of chalcogenides (EuX). The calculated results for EuX (S, Se and Te) by mBJ[Formula: see text][Formula: see text][Formula: see text]U are in good agreement with the experimental values as compared to the other calculated results.
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Grünenwald, Elisabeth, et Gertrud Fiege. « Rezension von : Fiege, Gertrud (Hrsg.), Bildnisse ». Württembergisch Franken 69 (19 janvier 2024) : 314. http://dx.doi.org/10.53458/wfr.v69i.9708.
Texte intégralRésumé :
Bildnisse. Verzeichnis der Plastiken, Gemälde, Handzeichnungen, Scherenschnitte im Schiller-Nationalmuseum und Deutschen Literaturarchiv Marbach. In Zusammenarb. mit Albrecht Bergold von Gertrud Fiege. Band 1: A-L. Band 2: M-Z. (= Deutsches Literaturarchiv. Verzeichnisse, Berichte, Informationen, 3 u. 4). Marbach: Deutsche Schillergesellschaft 1978. 103, 116 S.
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Huang, CH, K. Johe, JJ Moulds, PD Siebert, M. Fukuda et OO Blumenfeld. « Delta glycophorin (glycophorin B) gene deletion in two individuals homozygous for the S--s--U-- blood group phenotype ». Blood 70, no 6 (1 décembre 1987) : 1830–35. http://dx.doi.org/10.1182/blood.v70.6.1830.1830.
Texte intégralRésumé :
Abstract Blood cells from two unrelated individuals whose erythrocytes exhibit respectively N S-s-U- and MN S-s-U- blood group phenotypes were examined by immunoblotting, periodic acid-Schiff (PAS) staining, and Southern blotting. Protein bands characteristic of delta glycophorin (glycophorin B) were absent from the immunoblots of whole erythrocyte lysates when probed with polyclonal glycophorin antisera and from isolated erythrocyte membranes stained with PAS reagents. Genomic DNA from the two individuals' leukocytes was digested with a panel of restriction enzymes and probed with alpha M glycophorin cDNA obtained from human K562 leukemic cell line. The EcoRI, PstI, and KpnI restriction site patterns were identical to those of S+s+U+ controls in fragment numbers and relative size but differed from controls in band intensities. Restriction mapping with HindIII, PvuII, SacI, MspI, and BamHI revealed that S-s-U- individuals lack fragments that are reproducibly observed in S+s+U+ controls, and most likely encode delta glycophorin. Using truncated 5′ and 3′ cDNA segments as probes and comparing, in control individuals, hybridization intensities of fragments with amino acid sequence homologies, we have inferred the assignment of restriction fragments to the alpha and delta glycophorin genes. Our results suggest that the absence of delta glycophorin in the two S-s-U- individuals is a result of deletion of the entire delta glycophorin gene. This is the first report of a glycophorin gene deletion.
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Huang, CH, K. Johe, JJ Moulds, PD Siebert, M. Fukuda et OO Blumenfeld. « Delta glycophorin (glycophorin B) gene deletion in two individuals homozygous for the S--s--U-- blood group phenotype ». Blood 70, no 6 (1 décembre 1987) : 1830–35. http://dx.doi.org/10.1182/blood.v70.6.1830.bloodjournal7061830.
Texte intégralRésumé :
Blood cells from two unrelated individuals whose erythrocytes exhibit respectively N S-s-U- and MN S-s-U- blood group phenotypes were examined by immunoblotting, periodic acid-Schiff (PAS) staining, and Southern blotting. Protein bands characteristic of delta glycophorin (glycophorin B) were absent from the immunoblots of whole erythrocyte lysates when probed with polyclonal glycophorin antisera and from isolated erythrocyte membranes stained with PAS reagents. Genomic DNA from the two individuals' leukocytes was digested with a panel of restriction enzymes and probed with alpha M glycophorin cDNA obtained from human K562 leukemic cell line. The EcoRI, PstI, and KpnI restriction site patterns were identical to those of S+s+U+ controls in fragment numbers and relative size but differed from controls in band intensities. Restriction mapping with HindIII, PvuII, SacI, MspI, and BamHI revealed that S-s-U- individuals lack fragments that are reproducibly observed in S+s+U+ controls, and most likely encode delta glycophorin. Using truncated 5′ and 3′ cDNA segments as probes and comparing, in control individuals, hybridization intensities of fragments with amino acid sequence homologies, we have inferred the assignment of restriction fragments to the alpha and delta glycophorin genes. Our results suggest that the absence of delta glycophorin in the two S-s-U- individuals is a result of deletion of the entire delta glycophorin gene. This is the first report of a glycophorin gene deletion.
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SK Nathan, B Singh et TC Thakur. « Laboratory studies on performance of positive feed metering devices for band placement of fertilizers ». Journal of Agricultural Engineering (India) 37, no 02 (30 juin 2000) : 1–14. http://dx.doi.org/10.52151/jae2000372.0922.
Texte intégralRésumé :
The effect of shape, number of grooves and speed of fluted roller metering device was studied on metering characteristics of urea for intermittent and continuous band placements. For intermittent band placement, 6 groove rollers of U-shape, J-shape and eccentric-circular shape were used whereas 12 groove rollers of U-shape and eccentric circular shape were selected for continuous band placement. The principle of two stage metering of fertilizer was employed using a star type agitator running ~t a constant speed of 0.26 m/s and a fixed circular opening of 13.5 mm diameter in the hopper at the first stage and varying speeds of 28,42, 52, 68 and 85 rpm for positive feed fluted rollers at the second stage. The results showed higher percentage deposition of urea in 100 mm bands with J-shape fluted roller followed by eccentric circular and U-shape fluted rollers. In case of continuous band placement, the coefficient of variation ranged from 20.11 to 11.17% with eccentric circular shape and 15.79 to 9.45% with U-shape fluted roller with increase in speed from 28 to 85 rpm.
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Shen, Quan, Li Fan Shen, Hai Lin et Chang Min Li. « Tm3+-doped Bismuth Tellurite Glasses for S- and U-band Optical Amplifiers ». Advanced Materials Research 239-242 (mai 2011) : 3078–81. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.3078.
Texte intégralRésumé :
Effective ~1.47mm and powerful ~1.8mm infrared emissions have been observed in Tm3+-doped bismuth tellurite glasses with low phonon energy under the excitation of 793nm diode laser. Judd-Ofelt parameters W2 (4.65´10-20cm2), W4 (1.15´10-20cm2), and W6 (1.16´10-20cm2) indicate a higher asymmetric and stronger covalent environment in the optical glasses. In 0.5wt% Tm3+-doped sample, the peak emission cross-sections of 3H4®3F4 and 3F4®3H6 transitions are derived to be 2.83´10-21 and 6.13´10-21cm2, respectively, and the maximum gain coefficients of 0.38 and 2.21dB/cm at 1.675 (U-band edge) and 1.856mm wavelengths were anticipated in an ideal status. These results indicate the Tm3+-doped bismuth tellurite glasses are a promising candidate in developing S- and U-band amplifiers.
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Ulshöfer, Kuno, et Rolf Wilhelm Brednich. « Rezension von : Brednich, Rolf Wilhelm (Hrsg.), Die Ebermannstädter Liederhandschrif ». Württembergisch Franken 59 (24 avril 2024) : 96. http://dx.doi.org/10.53458/wfr.v59i.11429.
Texte intégralRésumé :
Die Ebermannstädter Liederhandschrift, geschrieben um 1750 von Frantz Melchior Freytag, Schulrektor zu Ebermannstadt. Hrsg. u. komm, von Rolf Wilh. Brednich und Wolfgang Suppan (= Die Plassenburg Band 31). Kulmbach 1972, 264 S.
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Heinselman, Pamela L., Daphne S. LaDue et Heather Lazrus. « Exploring Impacts of Rapid-Scan Radar Data on NWS Warning Decisions ». Weather and Forecasting 27, no 4 (1 août 2012) : 1031–44. http://dx.doi.org/10.1175/waf-d-11-00145.1.
Texte intégralRésumé :
Abstract Rapid-scan weather radars, such as the S-band phased array radar at the National Weather Radar Testbed in Norman, Oklahoma, improve precision in the depiction of severe storm processes. To explore potential impacts of such data on forecaster warning decision making, 12 National Weather Service forecasters participated in a preliminary study with two control conditions: 1) when radar scan time was similar to volume coverage pattern 12 (4.5 min) and 2) when radar scan time was faster (43 s). Under these control conditions, forecasters were paired and worked a tropical tornadic supercell case. Their decision processes were observed and audio was recorded, interactions with data displays were video recorded, and the products were archived. A debriefing was conducted with each of the six teams independently and jointly, to ascertain the forecaster decision-making process. Analysis of these data revealed that teams examining the same data sometimes came to different conclusions about whether and when to warn. Six factors contributing toward these differences were identified: 1) experience, 2) conceptual models, 3) confidence, 4) tolerance of possibly missing a tornado occurrence, 5) perceived threats, and 6) software issues. The three 43-s teams issued six warnings: three verified, two did not verify, and one event was missed. Warning lead times were the following: tornado, 18.6 and 11.5 min, and severe, 6 min. The three tornado warnings issued by the three 4.5-min teams verified, though warning lead times were shorter: 4.6 and 0 min (two teams). In this case, use of rapid-scan data showed the potential to extend warning lead time and improve forecasters’ confidence, compared to standard operations.
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DURNA, Nuh, et Rabia KILIÇ. « On the spectrum of the upper triangular double band matrix $U(a_{0},a_{1},a_{2};b_{0},b_{1},b_{2})$ over the sequence $c$ ». Communications Faculty Of Science University of Ankara Series A1Mathematics and Statistics 71, no 2 (30 juin 2022) : 554–65. http://dx.doi.org/10.31801/cfsuasmas.977593.
Texte intégralRésumé :
The upper triangular double band matrix $U(a_{0},a_{1},a_{2};b_{0},b_{1},b_{2})$ is defined on a Banach sequence space by $U(a_{0},a_{1},a_{2};b_{0},b_{1},b_{2})(x_{n})=(a_{n}x_{n}+b_{n}x_{n+1})_{n=0}^{\infty}$where $a_{x}=a_{y},~b_{x}=b_{y}$ for $x\equiv y~(mod3)$. The class of the operator$U(a_{0},a_{1},a_{2};b_{0},b_{1},b_{2})$includes, in particular, the operator $U(r,s)$ when $a_{k}=r$ and $b_{k}=s$ for all $k\in\mathbb{N}$, with $r,s\in\mathbb{R}$ and $s\neq 0$. Also, it includes the upper difference operator; $a_{k}=1$ and $b_{k}=-1$ for all $k\in\mathbb{N}$. In this paper, we completely determine the spectrum, the fine spectrum, the approximate point spectrum, the defect spectrum, and the compression spectrum of the operator $U(a_{0},a_{1},a_{2};b_{0},b_{1},b_{2})$ over the sequence space $c$.
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Carretti, E., M. Haverkorn, L. Staveley-Smith, G. Bernardi, B. M. Gaensler, M. J. Kesteven, S. Poppi et al. « S-band Polarization All-Sky Survey (S-PASS) : survey description and maps ». Monthly Notices of the Royal Astronomical Society 489, no 2 (5 septembre 2019) : 2330–54. http://dx.doi.org/10.1093/mnras/stz806.
Texte intégralRésumé :
Abstract We present the S-Band Polarization All Sky Survey (S-PASS), a survey of polarized radio emission over the southern sky at Dec. <−1° taken with the Parkes radio telescope at 2.3 GHz. The main aim was to observe at a frequency high enough to avoid strong depolarization at intermediate Galactic latitudes (still present at 1.4 GHz) to study Galactic magnetism, but low enough to retain ample signal-to-noise ratio (S/N) at high latitudes for extragalactic and cosmological science. We developed a new scanning strategy based on long azimuth scans and a corresponding map-making procedure to make recovery of the overall mean signal of Stokes Q and U possible, a long-standing problem with polarization observations. We describe the scanning strategy, map-making procedure and validation tests. The overall mean signal is recovered with a precision better than 0.5 per cent. The maps have a mean sensitivity of 0.81 mK on beam-size scales and show clear polarized signals, typically to within a few degrees of the Galactic plane, with ample S/N everywhere (the typical signal in low-emission regions is 13 mK and 98.6 per cent of pixels have S/N > 3). The largest depolarization areas are in the inner Galaxy, associated with the Sagittarius Arm. We have also computed a rotation measure map combining S-PASS with archival data from the Wilkinson Microwave Anisotropy Probe (WMAP) and Planck experiments. A Stokes I map has been generated, with sensitivity limited to the confusion level of 9 mK.
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Grünenwald, Elisabeth, et Bernhard Schemmel. « Rezension von : Schemmel, Bernahrd, Figuren und Reliefs an Haus und Hof in Franken ». Württembergisch Franken 65 (28 février 2024) : 296. http://dx.doi.org/10.53458/wfr.v65i.10627.
Texte intégralRésumé :
Bernhard Schemmel: Figuren und Reliefs an Haus und Hof in Franken. Quellen und Forschungen zur Geschichte des Bistums und Hochstifts Würzburg. Band 31. Hg. von Th. Kramer u. K. Wittstadt. Würzburg: Schöningh 1978. 68 S., 334 Abb.
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Kuster, Charles M., Pamela L. Heinselman et Marcus Austin. « 31 May 2013 El Reno Tornadoes : Advantages of Rapid-Scan Phased-Array Radar Data from a Warning Forecaster’s Perspective* ». Weather and Forecasting 30, no 4 (1 août 2015) : 933–56. http://dx.doi.org/10.1175/waf-d-14-00142.1.
Texte intégralRésumé :
Abstract On 31 May 2013, a supercell produced a tornado rated as 3 on the enhanced Fujita scale (EF3) near El Reno, Oklahoma, which was sampled by the S-band phased-array radar (PAR) at the National Weather Radar Testbed in Norman, Oklahoma. Collaboration with the forecaster who issued tornado warnings for the El Reno supercell during real-time operations focused the analysis on critical radar signatures frequently assessed during warning operations. The wealth of real-world experience provided by the forecaster, along with the quantitative analysis, highlighted differences between rapid-scan PAR data and the Weather Surveillance Radar-1988 Doppler located near Oklahoma City, Oklahoma (KTLX), within the context of forecast challenges faced on 31 May 2013. The comparison revealed that the 70-s PAR data proved most advantageous to the forecaster’s situational awareness in instances of rapid storm organization, sudden mesocyclone intensification, and abrupt, short-term changes in tornado motion. Situations where PAR data were most advantageous in the depiction of storm-scale processes included 1) rapid variations in mesocyclone intensity and associated changes in inflow magnitude; 2) imminent radar-indicated development of the short-lived (EF0) Calumet, Oklahoma, and long-lived (EF3) El Reno tornadoes; and 3) precise location and motion of the tornado circulation. As a result, it is surmised that rapid-scan volumetric radar data in cases like this would augment a forecaster’s ability to observe rapidly evolving storm features and deliver timely, life-saving information to the general public.
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Sato, K., K. Hirata, S. Singh, K. Kuga, F. Ogawa, M. Matsunami et T. Takeuchi. « Electronic structure of silver chalcogenides investigated by hard x-ray photoemission spectroscopy and density functional theory calculations ». Journal of Applied Physics 132, no 4 (28 juillet 2022) : 045104. http://dx.doi.org/10.1063/5.0095987.
Texte intégralRésumé :
We have investigated the electronic structure of silver chalcogenides Ag2 X ( X = S, Se, Te) and their solid solutions using hard x-ray photoemission spectroscopy in combination with density functional theory calculations using generalized gradient approximation (GGA). By including the corrections for on-site Coulomb interactions (GGA + U), we successfully reproduced the valence band photoemission spectra, which consist mainly of the Ag 4 d band, by calculation. The estimated values for U = 4–6 eV are slightly high for Ag 4 d electrons but are consistent with those used in previously reported structural studies. On the other hand, the magnitude of the energy gap is virtually independent of U. These results suggest the strong correlation between Ag 4 d electrons in Ag2 X compounds to have surprisingly little impact on their electron transport properties.
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LUPSA, ILEANA, et MIHAELA VALEANU. « HYBRIDIZATION EFFECTS IN SOME UTSi (2:1:3 ; 1:1:1 ; 2:3:1) COMPOUNDS ». Modern Physics Letters B 17, no 24 (20 octobre 2003) : 1277–82. http://dx.doi.org/10.1142/s0217984903006311.
Texte intégralRésumé :
The presence of magnetic moments in uranium atoms in some of U 2 TSi 3, UTSi and U 2 T 3 Si ( T is a 3d, 4d or 5d transition element) compounds is discussed in terms of the hybridization of s, p, d and f atomic orbitals. The hybridization strength in these ternary series of isostructural compounds was calculated using the semiquantitative band structure approach of Straub and Harrison. The prediction criterion for the presence of magnetic ordering, comparing the band width with a critical energy, seems to hold. The dominant influence of fd hybridization effects in the change of magnetic properties inside an isostructural group is in evidence.
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Chen, Jiaqi, Zhaofu Zhang, Yuzheng Guo et John Robertson. « Electronic properties of CaF2 bulk and interfaces ». Journal of Applied Physics 131, no 21 (7 juin 2022) : 215302. http://dx.doi.org/10.1063/5.0087914.
Texte intégralRésumé :
The electronic band structures of ultra-wide gap CaF2 are investigated with both the hybrid functional and the efficient generalized gradient approximation (GGA) + U scheme. The hybrid functional scheme is in excellent agreement with experiments, while introducing an on-site Coulomb interaction to F-2p orbitals also accurately reproduces the experimental bandgap and greatly improves the previous theoretical results using advanced electronic structure schemes. We also apply the GGA + U method to study CaF2/Si and metal/CaF2 interfaces. The CaF2/Si insulating interfaces with a clear bandgap are built based on the electron counting rule. Our supercell calculations of the CaF2/Si interfaces show a type-II band alignment and the valence band offset follows a descending trend from (001) to (111) then to (110). The calculation convergence of GGA + U is further tested with the metallic contacts. The metal/CaF2 interfaces are observed to be weakly pinned and different orientations of CaF2 sharing a similar pinning factor S up to ∼0.9, owing to the highly ionic nature of CaF2. The GGA + U approach is proven to be a useful tool in studying such fluoride interfaces and contacts.
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Fritz, Gerhard, et Ursula Krause-Schmitt. « Rezension von : Krause-Schmitt, Ursula, Baden-Württemberg ». Backnanger Jahrbuch 2 (22 décembre 2023) : 154–55. http://dx.doi.org/10.53458/bjb.v2i.8758.
Texte intégralRésumé :
Heimatgeschichtliche Wegweiser zu Stätten des Widerstandes und der Verfolgung 1933 - 1945. Band 5: Baden-Württemberg 1. Regierungsbezirke Karlsruhe und Stuttgart. Hrsg. v. Studienkreis Deutscher Widerstand. Redaktion Ursula Krause-Schmitt u. a. Frankfur/M.: Verlag für akademische Schriften 1991. 330 S.
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Iqbal, Amjad, Amor Smida, Nazih Mallat, Mohammad Islam et Sunghwan Kim. « A Compact UWB Antenna with Independently Controllable Notch Bands ». Sensors 19, no 6 (22 mars 2019) : 1411. http://dx.doi.org/10.3390/s19061411.
Texte intégralRésumé :
A minimally-sized, triple-notched band ultra-wideband (UWB) antenna, useful for many applications, is designed, analyzed, and experimentally validated in this paper. A modified maple leaf-shaped main radiating element with partial ground is used in the proposed design. An E-shaped resonator, meandered slot, and U-shaped slot are implemented in the proposed design to block the co-existing bands. The E-shaped resonator stops frequencies ranging from 1.8–2.3 GHz (Advanced Wireless System (AWS1–AWS2) band), while the meandered slot blocks frequencies from 3.2–3.8 GHz (WiMAX band). The co-existing band ranging from 5.6–6.1 GHz (IEEE 802.11/HIPERLANband) is blocked by utilizing the U-shaped section in the feeding network. The notched bands can be independently controlled over a wide range of frequencies using specific parameters. The proposed antenna is suitable for many applications because of its flat gain, good radiation characteristics at both principal planes, uniform group delay, and non-varying transfer function ( S 21 ) for the entire UWB frequency range.
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Qin, Tao, Chenlu Huang, Yang Cai et Xianqi Lin. « Dual-Band Frequency Selective Surface with Different Polarization Selectivity for Wireless Communication Application ». Sensors 23, no 9 (25 avril 2023) : 4264. http://dx.doi.org/10.3390/s23094264.
Texte intégralRésumé :
This article proposes a dual-band, frequency- and polarization-selective surface. Multiple resonant modes are introduced using the U-shaped resonator with a ground via to achieve dual-band responses and polarization selectivity. Two symmetrically grounded U-shaped resonators are coupled through electrically coupled apertures in a common ground, resulting in a passband with two transmission zeros per polarization. A general design flowchart and additional examples at the S, X, and K-bands are presented as well. A prototype at X-band is analyzed, fabricated, and measured, showing the passband center frequencies of 9.68 GHz and 10.73 GHz, factional bandwidths of 3.45% and 3.48%, and insertion losses of 0.9 dB and 1.1 dB, respectively. Due to the high selectivity, small frequency ratio, low profile, and stable performance under oblique incidence, the proposed designs have application potential in wireless communication systems.
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PIACENZA, L., R. RADI, F. GOÑI et C. CARMONA. « CuZn superoxide dismutase activities from Fasciola hepatica ». Parasitology 117, no 6 (décembre 1998) : 555–62. http://dx.doi.org/10.1017/s0031182098003394.
Texte intégralRésumé :
The levels of superoxide dismutase (SOD) were determined in detergent-soluble, somatic and excretion–secretion (E–S) preparations from adult Fasciola hepatica using the xanthine oxidase system and visualized in substrate gels. Compared to detergent-soluble and somatic extracts, E–S products showed the highest SOD activity (88 ·5 U/mg), indicating active release to the medium in which parasites were maintained. SOD specific activity was also detected at high levels in E–S products from 3-week-old and 5-week-old immature migrating flukes (25 and 143 U/mg, respectively). In all preparations except for the somatic extract, the activity was characterized as cyanide-sensitive CuZn SOD. Differences in SOD isoenzyme profiles between the extracts were observed in native polyacrylamide gel electrophoresis: the somatic and detergent-soluble extracts exhibited 1 band of activity while the E–S products from immature and adults flukes contained 2 and 3 migrating bands, respectively. SOD was purified from the detergent-soluble extract and E–S products of adult worms by a combination of ultrafiltration, gel filtration on Sephacryl S-200 HR and ion-exchange chromatography on QAE Sephadex A-50. The SOD from detergent-soluble extract showed, by SDS–PAGE analysis, 1 band of 16 kDa apparent molecular weight. The SOD from E–S products showed 2 bands of 16 and 60 kDa apparent molecular weight. N-terminal sequence analysis of the 16 kDa band from the detergent-soluble preparation showed some similarity with Schistosoma mansoni cytoplasmic SOD. These enzymes may have a potential role in the evasion of the oxidative burst killing mechanism by immune cells.
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Ungar, Max D., et Michael C. Coniglio. « Using Radiosonde Observations to Assess the “Three Ingredients Method” to Forecast QLCS Mesovortices ». Weather and Forecasting 38, no 12 (décembre 2023) : 2441–60. http://dx.doi.org/10.1175/waf-d-22-0176.1.
Texte intégralRésumé :
Abstract A technique used widely to forecast the potential for QLCS mesovortices is known as the “Three Ingredients Method” (3IM). The 3IM states that mesovortices are favored where 1) the QLCS cold pool and ambient low-level shear are said to be nearly balanced or slightly shear dominant, 2) where the component of the 0–3-km wind shear normal to the convective line is ≥30 kt (1 kt ≈ 0.51 m s−1), and 3) where a rear-inflow jet or enhanced outflow causes a surge or bow along the convective line. Despite its widespread use in operational settings, this method has received little evaluation in formal literature. To evaluate the 3IM, radiosonde observations are compared to radar-observed QLCS properties. The distance between the gust front and high reflectivity in the leading convective line (the “U-to-R distance”), the presence of rear-inflow surges, and mesovortices (MVs) were each assessed across 1820 line segments within 50 observed QLCSs. Although 0–3-km line-normal wind shear is statistically different between MV-genesis and null segments, values are ≤30 kt for 44% of MV-genesis segments. The 0–6-km line-normal wind shear also shows strong discrimination between MV-genesis and null segments and displays the best linear relationship of the U-to-R distance (a measure of system balance) among layers tested, although the scatter and overlap in distributions suggest that many factors can impact MV genesis (as expected). Overall, most MVs occur where the U-to-R distance lies between −5 and 5 km in the presence of a rear-inflow surge, along with positive 0–1-km wind shear, 0–3-km wind shear > 10 kt, and 0–6-km wind shear > 20 kt (all line-normal). Significance Statement Near the leading edge of thunderstorm lines, areas of rotation that can produce tornadoes and strong winds (“mesovortices”) often develop rapidly. Despite advances in understanding mesovortices, few operational guidelines exist to anticipate their genesis. One popular method used to forecast mesovortices—the “Three Ingredients Method”—is evaluated in this study. Our work confirms the importance of two of the ingredients—a surge of outflow winds and thunderstorms that stay nearly atop the leading edge of the outflow. However, we find that many mesovortices occur below the threshold of low-level wind shear ascribed by the forecast method. Refinements to the method are suggested, including the favorable distance between the leading edge of the outflow and thunderstorm updrafts and lower bounds of wind shear over multiple layers, below which mesovortices may be unlikely.
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Zhou, Shi Wen, Jian Liu, Ping Peng et Wen Qin Chen. « Effects of S/Ce-codoping on electronic structures and optical properties of anatase TiO2 from density functional theory calculations ». Modern Physics Letters B 29, no 35n36 (30 décembre 2015) : 1550249. http://dx.doi.org/10.1142/s0217984915502498.
Texte intégralRésumé :
The electronic and optical properties of S- and/or Ce-(co)doped anatase titanium dioxide (TiO2) are investigated using density functional theory plus U (DFT[Formula: see text]U) calculations. The optimized total energy suggests that TiO2 codoping by Ce and S favours the configuration of one substitutional Ce atom occupied on a Ti site with one substitutional S atom either on its nearest neighboring O or Ti site. The calculated results show that all doping configurations exhibit remarkable red-shift and excellent photocatalytic properties compared with pure TiO2. These reinforced features can mainly be ascribed to the appearance of S [Formula: see text] states in the top of valence band (VB) and Ce [Formula: see text] states in the bottom of conduction band (CB) as well as the contribution from the increasing octahedral dipole moments. The synergetic effects of cationic Ce and anionic S can extend optical absorption edge, which results in higher absorption coefficient in the visible light region than that of the anionic S monodoping and cationic Ce monodoping case; in the same time, decreasing the codoping concentration leads to reduced optical absorption. Additionally, Ce and S as cations incorporating into TiO2 lattices can induce stronger redox potential with a lower defect formation energy under O-rich condition compared with other doping systems.
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Kalina, Evan A., Katja Friedrich, Brian C. Motta, Wiebke Deierling, Geoffrey T. Stano et Nezette N. Rydell. « Colorado Plowable Hailstorms : Synoptic Weather, Radar, and Lightning Characteristics ». Weather and Forecasting 31, no 2 (1 avril 2016) : 663–93. http://dx.doi.org/10.1175/waf-d-15-0037.1.
Texte intégralRésumé :
Abstract Synoptic weather, S-band dual-polarization radar, and total lightning observations are analyzed from four thunderstorms that produced “plowable” hail accumulations of 15–60 cm in localized areas of the Colorado Front Range. Results indicate that moist, relatively slow (5–15 m s−1) southwesterly-to-westerly flow at 500 hPa and postfrontal low-level upslope flow, with 2-m dewpoint temperatures of 11°–19°C at 1200 LST, were present on each plowable hail day. This pattern resulted in column-integrated precipitable water values that were 132%–184% of the monthly means and freezing-level heights that were 100–700 m higher than average. Radar data indicate that between one and three maxima in reflectivity Z (68–75 dBZ) and 50-dBZ echo-top height (11–15 km MSL) occurred over the lifetime of each hailstorm. These maxima, which imply an enhancement in updraft strength, resulted in increased graupel and hail production and accumulating hail at the surface within 30 min of the highest echo tops. The hail core had Z ~ 70 dBZ, differential reflectivity ZDR from 0 to −4 dB, and correlation coefficient ρHV of 0.80–0.95. Time–height plots reveal that these minima in ZDR and ρHV gradually descended to the surface after originating at heights of 6–10 km MSL ~15–60 min prior to accumulating hailfall. Hail accumulations estimated from the radar data pinpoint the times and locations of plowable hail, with depths greater than 5 cm collocated with the plowable hail reports. Three of the four hail events were accompanied by lightning flash rates near the maximum observed thus far within the thunderstorm.
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Voit, Thomas, Birgit Kulessa et Christoph Bittel. « Rezension von : Kulessa, Birgit ; Bittel, Christoph, Bad Mergentheim ». Württembergisch Franken 105 (23 mai 2023) : 257–58. http://dx.doi.org/10.53458/wfr.v105i.6407.
Texte intégralRésumé :
Birgit Kulessa und Christoph Bittel: Bad Mergentheim – Archäologisches Stadtkataster Baden-Württemberg, Band 42, hg. vom Landesamt für Denkmalpflege im Regierungspräsidium Stuttgart in Verbindung mit der Stadt Bad Mergentheim. Filderstadt-Plattenhardt (F. u. T. Müllerbader) 2020. 368 S., zahlr. teils farbige Abb., 5 Beilagen als thematische Karten
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Ashall, C., J. Lu, B. J. Shappee, C. R. Burns, E. Y. Hsiao, S. Kumar, N. Morrell et al. « A Speed Bump : SN 2021aefx Shows that Doppler Shift Alone Can Explain Early Excess Blue Flux in Some Type Ia Supernovae ». Astrophysical Journal Letters 932, no 1 (1 juin 2022) : L2. http://dx.doi.org/10.3847/2041-8213/ac7235.
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Abstract We present early-time photometric and spectroscopic observations of the Type Ia supernova (SN Ia) 2021aefx. The early-time u-band light curve shows an excess flux when compared to normal SNe Ia. We suggest that the early excess blue flux may be due to a rapid change in spectral velocity in the first few days post explosion, produced by the emission of the Ca ii H&K feature passing from the u to the B bands on the timescale of a few days. This effect could be dominant for all SNe Ia that have broad absorption features and early-time velocities over 25,000 km s−1. It is likely to be one of the main causes of early excess u-band flux in SNe Ia that have early-time high velocities. This effect may also be dominant in the UV filters, as well as in places where the SN spectral energy distribution is quickly rising to longer wavelengths. The rapid change in velocity can only produce a monotonic change (in flux-space) in the u band. For objects that explode at lower velocities, and have a more structured shape in the early excess emission, there must also be an additional parameter producing the early-time diversity. More early-time observations, in particular early spectra, are required to determine how prominent this effect is within SNe Ia.
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Ahmad, H., A. A. Latif, N. A. Awang, M. Z. Zulkifli, K. Thambiratnam, Z. A. Ghani et S. W. Harun. « Wide-band fanned-out supercontinuum source covering O-, E-, S-, C-, L- and U-bands ». Optics & ; Laser Technology 44, no 7 (octobre 2012) : 2168–74. http://dx.doi.org/10.1016/j.optlastec.2012.03.007.
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Filalli, Sihem, et Noura Hamdad. « Electro-Magnetic Behavior of Highly Correlated Fluorides KFeF3, KCoF3 and KNiF3 : A Comparative Ab-initio Study of Cation Effect ». Annals of West University of Timisoara - Physics 62, no 1 (1 décembre 2020) : 23–51. http://dx.doi.org/10.2478/awutp-2020-0003.
Texte intégralRésumé :
AbstractFluorides-based perovskites are currently the typical materials being used in spintronic devices, optoelectronic and magneto-resistance colossal fields. Solar cells made of Fluoro-perovskite hold much promise for the future of solar energy. The electronic structure and magnetic properties of KFeF3, KCoF3 and KNiF3 Fluorides are studied using ab initio Calculation. We have analysed the structural phases, total and partial electronic densities and band structures within the (DFT) vs the DFT+U description. We show the Electro-Magnetic Behavior using L(S)DA+U vs L(S)DA in a comparative study of cation effect by integrating three types of crystal structures (Cubic (Pm-3m), Four-Layered Hexagonal (P6/mmc), and Orthorhombic (Pnma)). Equilibrium lattices agree very well with experimental and theoretical data. Magnetic moment of each phase is discussed. The obtained results confirmed that the three crystal structures invested here exhibit Ferromagnetic (FM) behavior. The introduction of the Hubbard’s parameter U increases lattice parameters and magnetic moment. We deduce that the second cation plays an important role in the magnetic effects. L(S)DA+U show correctly that KFeF3, KCoF3 and KNiF3 are insulators.
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Limentani, Steven A., Kerry P. Gowell et Steven R. Deitcher. « In Vitro Characterization of High Purity Factor IX Concentrates for the Treatment of Hemophilia B ». Thrombosis and Haemostasis 73, no 04 (1995) : 584–91. http://dx.doi.org/10.1055/s-0038-1653825.
Texte intégralRésumé :
SummaryThis study employed sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) analysis and immunoblotting to assess the purity of seven high purity factor IX concentrates: Aimafix (Aima), AlphaNine-SD (Alpha Therapeutic), Factor IX VHP (Biotransfusion), Immunine (Immuno), Mononine (Armour Pharmaceutical), Nanotiv (Kabi Pharmacia), and 9MC (Blood Products Laboratory). The mean specific activity of these products ranged from 68 U factor IX/mg (Aimafix) to 246 U factor IX/mg (Mononine). SDS-PAGE analysis showed that the highest purity product, Mononine, had a single contaminating band under non-reducing conditions. Two additional bands were detected when this product was analyzed under reducing conditions. All other products had multiple contaminating bands that were more apparent under reducing than non-reducing conditions. The immunoblot for factor IX showed a dominant factor IX band for all products. In addition, visible light chain of factor IX was detected for AlphaNine-SD, Factor IX VHP, Immunine, Mononine, Nanotiv, and 9MC, suggesting that the factor IX in these products had undergone partial activation to factor IXa. Another contaminating band was visible at 49,500 for all of the products except 9MC. In addition to this band, high molecular weight contaminants were apparent for some products, most notably AlphaNine-SD. The identity of these bands is unknown. Immunoblotting failed to demonstrate factor VII as a contaminant of any of the high purity products, although factor Vila could be detected in some lots of Immunine, Nanotiv, and 9MC by a clot-based assay. Factor X contaminated Aimafix, AlphaNine-SD, Factor IX VHP, Immunine, Nanotiv, and 9MC, but activation products of factor X were not detected. Prothrombin contaminated all of the products except Mononine. Activation products of prothrombin were identified for three of four lots of Immunine and for one lot of Factor IX VHP. These results thus demonstrate that high purity factor IX concentrates differ substantially in the degree to which they are contaminated by potentially thrombogenic materials.
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Snyder, Jeffrey C., et Howard B. Bluestein. « Some Considerations for the Use of High-Resolution Mobile Radar Data in Tornado Intensity Determination ». Weather and Forecasting 29, no 4 (22 juillet 2014) : 799–827. http://dx.doi.org/10.1175/waf-d-14-00026.1.
Texte intégralRésumé :
Abstract The increasing number of mobile Doppler radars used in field campaigns across the central United States has led to an increasing number of high-resolution radar datasets of strong tornadoes. There are more than a few instances in which the radar-measured radial velocities substantially exceed the estimated wind speeds associated with the enhanced Fujita (EF) scale rating assigned to a particular tornado. It is imperative, however, to understand what the radar data represent if one wants to compare radar observations to damage-based EF-scale estimates. A violent tornado observed by the rapid-scan, X-band, polarimetric mobile radar (RaXPol) on 31 May 2013 contained radar-relative radial velocities exceeding 135 m s−1 in rural areas essentially devoid of structures from which damage ratings can be made. This case, along with others, serves as an excellent example of some of the complications that arise when comparing radar-estimated velocities with the criteria established in the EF scale. In addition, it is shown that data from polarimetric radars should reduce the variance of radar-relative radial velocity estimates within the debris field compared to data from single-polarization radars. Polarimetric radars can also be used to retrieve differential velocity, large magnitudes of which are spatially associated with large spectrum widths inside the polarimetric tornado debris signature in several datasets of intense tornadoes sampled by RaXPol.
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Fan, Zhou, Gang Zhao, Wei Wang, Jie Zheng, Jingkun Zhao, Chun Li, Yuqin Chen et al. « The Stellar Abundances and Galactic Evolution Survey (SAGES). I. General Description and the First Data Release (DR1) ». Astrophysical Journal Supplement Series 268, no 1 (22 août 2023) : 9. http://dx.doi.org/10.3847/1538-4365/ace04a.
Texte intégralRésumé :
Abstract The Stellar Abundances and Galactic Evolution Survey (SAGES) of the northern sky is a specifically designed multiband photometric survey aiming to provide reliable stellar parameters with accuracy comparable to those from low-resolution optical spectra. It was carried out with the 2.3 m Bok telescope of Steward Observatory and three other telescopes. The observations in the u s and v s passband produced over 36,092 frames of images in total, covering a sky area of ∼9960 deg2. The median survey completenesses of all observing fields for the two bands are u s = 20.4 mag and v s = 20.3 mag, respectively, while the limiting magnitudes with signal-to-noise ratio of 100 are u s ∼ 17 mag and v s ∼ 18 mag, correspondingly. We combined our catalog with the data release 1 (DR1) of the first Panoramic Survey Telescope And Rapid Response System (Pan-STARRS, PS1) catalog, and obtained a total of 48,553,987 sources that have at least one photometric measurement in each of the SAGES u s and v s and PS1 grizy passbands. This is the DR1 of SAGES, released in this paper. We compared our gri point-source photometry with those of PS1 and found an rms scatter of ∼2% difference between PS1 and SAGES for the same band. We estimated an internal photometric precision of SAGES to be of the order of ∼1%. Astrometric precision is better than 0.″2 based on comparison with DR1 of the Gaia mission. In this paper, we also describe the final end-user database, and provide some science applications.
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Kuster, Charles M., Pamela L. Heinselman et Terry J. Schuur. « Rapid-Update Radar Observations of Downbursts Occurring within an Intense Multicell Thunderstorm on 14 June 2011 ». Weather and Forecasting 31, no 3 (1 juin 2016) : 827–51. http://dx.doi.org/10.1175/waf-d-15-0081.1.
Texte intégralRésumé :
Abstract On 14 June 2011, an intense multicell thunderstorm produced one nonsevere and three severe downbursts within 35 km of the rapid-update, S-band phased array radar (PAR) at the National Weather Radar Testbed in Norman, Oklahoma, and the nearby polarimetric research Weather Surveillance Radar 1988-Doppler (KOUN). Data collected from these radars provided the opportunity to conduct a quantitative analysis of downburst precursor signature evolution depicted by 1-min PAR data and the associated evolution of differential reflectivity ZDR depicted by 5-min KOUN data. Precursors analyzed included descent of the reflectivity core, evolution of the magnitude and size of midlevel convergence (i.e., number of bins), and descending “troughs” of ZDR. The four downbursts exhibited midlevel convergence that rapidly increased to peak magnitude as the reflectivity core (65-dBZ isosurface) bottom and top descended. The ZDR troughs seen in the 5-min KOUN data appeared to descend along with the core bottom. Midlevel convergence size increased to a peak value and decreased as the reflectivity core descended in the three severe downbursts. In contrast, midlevel convergence size exhibited little change in the nonsevere downburst. The time scale of trends seen in the PAR data was 11 min or less and happened several minutes prior to each downburst’s maximum intensity. These results point to the importance of 1-min volumetric data in effectively resolving the evolution of downburst precursors, which could be beneficial to forecast operations.
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Weber, Raimund J., et Sigrid Jahns. « Rezension von : Jahns, Sigrid, Darstellung ». Zeitschrift für Württembergische Landesgeschichte 72 (6 avril 2022) : 563–65. http://dx.doi.org/10.53458/zwlg.v72i.2415.
Texte intégralRésumé :
Sigrid Jahns: Das Reichskammergericht und seine Richter. Verfassung und Sozialstruktur eines höchsten Gerichts im Alten Reich, Teil I: Darstellung (Quellen und Forschungen zur höchsten Gerichtsbarkeit im Alten Reich, hg. von Friedrich Battenberg, Alfred Cordes u. a., Band 26, Teil I). Köln/Weimar/Wien: Böhlau-Verlag 2011. XVI, 783 S., 8 Karten, 3 Abb., 2 Verwandtschaftstafeln. ISBN 978-3-412-06403-7. € 59,90
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Taleb Hussein, Refat, et Dheif Ibrahem Abood. « Wideband improvement for hybrid plasmonic fractal patch nanoantenna ». Bulletin of Electrical Engineering and Informatics 11, no 5 (1 octobre 2022) : 2672–78. http://dx.doi.org/10.11591/eei.v11i5.4129.
Texte intégralRésumé :
A wideband improvement for hybrid plasmonic fractal patch nanoantenna is presented for use in intra/inter chip optical interconnects. The suggested fractal patch antenna covering a part of U-band (1625-1675), L-band (1565-1625nm), C-band (1530-¬1565nm), S-band (1460-1530nm), E-band (1360-1460nm) and most of O-band (1260-1360nm) optical communication bands. The proposed antenna has a promising future use in inter and intra chip optical communications to eliminate electrical interconnection limitations such as interconnect density, power consumption and also increasing data rate. The performance of this antenna has been evaluated using full wave simulation computer simulation technology (CST) Microwave software. The impedance bandwidth is largely enhanced by applying rectangular fractal cuts to the both sides of patch. The proposed antenna achieves a wider bandwidth from 168 THz to 228 THz (B.W.=60 THz), which is about 8 times greater the bandwidth of reference antenna with a good gain and more than 95% radiation efficiency throughout the operational bandwidth.
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Derras, M., et N. Hamdad. « Structural Stability and Magnetic Ordering in BiFeO3 Perovskite Oxide : A Comparative Study GGA+U vs L(S)DA+U ». Annals of West University of Timisoara - Physics 62, no 1 (1 décembre 2020) : 52–70. http://dx.doi.org/10.2478/awutp-2020-0004.
Texte intégralRésumé :
AbstractAb initio calculations of BiFeO3 magnetic perovskite are carried. Accurate density functional theory calculations were performed considering a U-Hubbard correction (DFT+U) to account for on-site Coulomb interactions of the 3d-Fe states. We have applied the Full-potential linearized augmented plane waves (FP-LAPW) method. Exchange-correlation effects are treated using the Local Spin Density approximation (L(S)DA+U) vs generalized gradient approximations (GGA+U). Equilibrium lattices agree very well with other theoretical and experimental data. The magnetization energy differences between Spin Up and Spin Dn states are small. Spin effect and magnetic moment obtained from subsequent (L(S)DA+U) and (GGA+U) calculations are also discussed in different magnetic configurations: The Ferromagnetic cubic phase (Pm-3m), The A-type Antiferromagnetic (P4/mmc) and The G-type Antiferromagnetic (Fm-3m). The nature of magnetism arises mainly from the Fe-site exhibiting a G-type antiferromagnetic ordering. The electronic structure shows that BiFeO3 has a metallic band gap. This multiferroic exhibit strong hybridization of the 3d-Fe and 2p-O orbitals. Therefore, the Multiferroic BiFeO3 perovskite has driven significant research interest due to their promising technological potential. It’s a good candidate for potential applications in spintronic, and to aid the development of the next generation of data storage and multi-functional technological devices.
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Reznik A.N. et Vostokov N. V. « Microwave volt-impedance spectroscopy of semiconductor structure ». Semiconductors 57, no 3 (2023) : 169. http://dx.doi.org/10.21883/sc.2023.03.56232.4532.
Texte intégralRésumé :
Microwave voltage-impedance spectroscopy is used to study a semiconductor structure in the form of a doped n-GaAs film grown on a conducting n^+-GaAs substrate with a buffer sublayer. A system of concentric barrier contacts is formed on the structure surface. A technique has been developed for measuring complex impedance spectrum Z(f,U) of the sample as a function of DC bias voltage U. Spectra Z(f,U) were measured using a Cascade Microtech probe station in the frequency range 0.01-40 GHz with a lateral resolution of 15-30 μm at U=0-10 V. The main electrophysical characteristics of a semiconductor film were determined from the spectra: type, concentration and mobility of free charge carriers, electrical conductivity. An excess resistance was found in the range f=0.1-20 GHz. This effect is interpreted as the deep states (traps) recharging for two types of traps --- low-frequency l and high-frequency h with characteristic time tau_l=10-9 s, tau_h=4.2·10-11 s. A model description is proposed that explains the characteristic shape of the trap resistance spectrum, its dependence on the contact area and voltage U. Keywords: microwave band, near field, impedance, semiconductor, barier contact, deep states, electrophysical characteristics.
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Aghbashlo, M., M. H. Kianmehr, A. Arabhosseini et T. Nazghelichi. « Modelling the carrot thin-layer drying in a semi-industrial continuous band dryer ». Czech Journal of Food Sciences 29, No. 5 (7 octobre 2011) : 528–38. http://dx.doi.org/10.17221/158/2010-cjfs.
Texte intégralRésumé :
This paper presents a mathematical modelling of the drying process in a semi-industrial continuous band dryer. Carrot slices with the thickness of 5 mm were used for the drying experiments. The experiments were conducted at three air temperatures, 50, 60, and 70°C, three air velocities, 0.5, 1.0, and 1.5 m/s, and three chain linear velocities, 2.38 × 10<sup>–4</sup>, 2.78 × 10<sup>–4</sup>, and 3.33 × 10<sup>–4</sup> m/s with three replications for each treatment. The Lewis, Henderson & Pabis, and Page models were fitted to the experimental data of the moisture ratio against the sample position using non-linear regression analysis by MATLAB computer program. The models were compared based on their coefficients of determination (R<sup>2</sup>), root mean square errors (RMSE), and reduced chi-squares (χ<sup>2</sup>) between the experimental and predicted moisture ratios. Consequently, the Page model was selected as the best mathematical model for describing the drying kinetics of the carrot slices. The correlations of the Page model constants k and m with the variables T, U<sub>a</sub> and U<sub>c</sub> were determined. The effective moisture diffusivity varied from 3.21 × 10<sup>–7</sup> to 8.98 × 10<sup>–7 </sup>m<sup>2</sup>/s. The energy of activation varied from 23.02 kJ/mol to 28.1 kJ/mol using Arrhenius type equation.