106,928 research outputs found
On holomorphy of local Langlands L-functions
No full textThis work studies local Langlands L-functions defined via the Langlands-Shahidi method which associates a complex function with a generic representation of a Levi subgroup in a quasi-split reductive p-adic group. Defining these functions via existence of certain γ-factors, essentially quotients of these L-functions, Shahidi set forth a conjecture on their holomorphy in a half plane if the representation is tempered. He subsequently proved this conjecture for classical groups. The goal here is to prove this conjecture for Levi subgroups of the so-called spin groups, the double coverings of special orthogonal groups. We also verify the conjecture for Levi subgroups of exceptional groups of type F 4. H. Kim has recently proved the conjecture for E-type exceptional groups except for a few cases in which the representation theory of the Levi subgroup is not known well enough. The conjecture for an exceptional group of type G2 is already well-known
Quarantined Cc-stretched Formic Acid: Molecular Work-out In (self) Isolation
Get PDFVibrational spectra of small molecules effectively probe the underlying potential energy hypersurface, which can be tested when combined with accurate anharmonic calculations.\footnote{P. R. Franke, J. F. Stanton, G. E. Douberly, \textit{J. Phys. Chem. A} \textbf{2021}, \textit{125}, 1301--1324; J. M. Bowman, T. Carrington, H.-D. Meyer, \textit{Mol. Phys.} \textbf{2008}, \textit{106}, 2145--2182.} Particularly suited for a performance test of quantum chemical gas phase calculations are spectra recorded in a supersonic expansion, as significant rotational cooling is achieved while the molecules or molecular clusters remain isolated in the gas phase. One of the smallest reference systems for such a benchmarking study is the formic acid monomer with its --torsional isomerism.\footnote{D. P. Tew, W. Mizukami, \textit{J. Phys. Chem. A} \textbf{2016}, \textit{120}, 9815--9828; F. Richter, P. Carbonni\`{e}re, \textit{J. Chem. Phys.} \textbf{2018}, \textit{148}, 064303; A. Nejad, E. L. Sibert III, \textit{J. Chem. Phys.} \textbf{2021}, \textit{154}, 064301.} Recently, new vibrational reference data on the stretching vibrations of all four H/D isotopologues of the higher-energy -conformer were provided the combination of Raman jet spectroscopy with thermal excitation.\footnote{A. Nejad , M. A. Suhm, K. A. E. Meyer, \textit{Phys. Chem. Chem. Phys.} \textbf{2020}, \textit{22}, 25492--25501.} Another very interesting carboxylic acid for such a study is the smallest acetylenic acid, HCC-COOH, whose - and -rotamers will be discussed in this contribution. Of particular interest are two almost isoenergetic -fundamentals of different symmetry which are shown to be a particularly useful benchmarking target, but also the dimers of the CC-stretched formic acid prove to be an insightful reference system for benchmarking.\footnote{K. A. E. Meyer, A. Nejad, \textit{Phys. Chem. Chem. Phys.} \textbf{2021}, \textit{23}, 17208--17223.
Glassy Carbon Electrode Modified with N-Doped Reduced Graphene Oxide Sheets as an Effective Electrochemical Sensor for Amaranth Detection
No full textAmaranth is one of the synthetic azo colorants used to improve the appearance and to increase the appeal of some foods and soft drinks. The excessive consumption of amaranth can be associated with health side effects, emphasizing the need to monitor this food dye. Accordingly, the present study aimed to introduce an electrochemical sensor of glassy carbon electrode (GCE) modified with N-doped reduced graphene oxide (N-rGO), N-rGO/GCE, to detect the amaranth sensitively and rapidly. Several electrochemical techniques such as differential pulse voltammetry (DPV), linear sweep voltammetry (LSV), chronoamperometry (CHA), and cyclic voltammetry (CV) are exploited for the evaluation of the efficiency of the developed electrode for the detection of amaranth. We found that N-rGO/GCE enhanced amaranth oxidation, thus significantly elevating the current signal. Amaranth showed that calibration curves ranged from 0.1 to 600.0 μM, and the limit of detection (LOD) (S/N = 3) was 0.03 μM. Finally, the developed sensor was effectively applied for real samples (tap water, apple juice, and orange juice) with acceptable recovery values from 96.0 to 104.3%
The Formic Acid Monomer: Extension Of The Vibrational Database And Rigorous Electronic And Nuclear Vibrational Structure Benchmarks
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The vibrational spectroscopy of formic acid, F, has seen new and important experimental and theoretical impulses in the past six years.\footnote{%
(exp) K. Hull, T. Wells, B. E. Billinghurst, H. Bunn, P. L. Raston, \textit{AIP Adv.} \textbf{2019}, \textit{9}, 015021;
K. A. E. Meyer, M. A. Suhm, \textit{Chem. Sci.} \textbf{2019}, \textit{10}, 6285;
A. Nejad, M. A. Suhm, K. A. E. Meyer, \textit{Phys. Chem. Chem. Phys.} \textbf{2020}, \textit{22}, 25492.
(theo) D. P. Tew, W. Mizukami, \textit{J. Phys. Chem. A} \textbf{2016}, \textit{120}, 9815;
F. Richter, P. Carbonni\`{e}re, \textit{J. Chem. Phys.} \textbf{2018}, \textit{148}, 064303;
A. Aerts, P. Carbonni\`{e}re, F. Richter, A. Brown, \textit{J. Chem. Phys.} \textbf{2020}, \textit{152}, 024305;
A. Nejad, E. L. Sibert III, \textit{J. Chem. Phys.} \textbf{2021}, \textit{154}, 064301.%
}
In a combined experimental and theoretical approach, the vibrational database of F below 4000\,{\wn} is reviewed and extended to 189 band centres [300\% increase], including a plethora of highly-excited vibrational states, both torsional conformers, and several isotopologues [H, H, C, C, and O].\footnote{%
A. Nejad, PhD thesis, submitted (2022).%
}
Essentially, the vibrational characterisation of its skeletal modes below 3500\,{\wn} can be regarded as complete which is also an important stepping stone in understanding the complex vibrational dynamics of its cyclic dimer.\footnote{A. Nejad, K. A. E. Meyer, F. Kollipost, Z. Xue, M. A. Suhm , \textit{J. Chem. Phys.} \textbf{2021}, \textit{155}, 224301%
}
A new key insight is that the impact of the OH bend-torsion resonance [\nub{5} and 2\nub{9}] on the entire vibrational dynamics of \textit{trans}-HCOOH is more far-reaching than previously believed.
Beyond 3500\,{\wn}, which is also near the expected \textit{trans}\textit{cis} isomerisation threshold, this resonance polyad is indicated to play an important role in the perturbations of the OH stretching fundamental [\nub{1}].
In this contribution, new spectroscopic developments are summarised and promising future research directions for F are discussed. In particular, its importance and suitability for the purpose of benchmarking electronic and nuclear vibrational methodologies are highlighted
Trombidium barooghi Saboori & Irani-Nejad, 2007, sp. nov.
No full textTrombidium barooghi sp. nov. (Figs. 1–6) Diagnosis. Larva with the following features: fD = (2) 4-6 - 4 - 4 - 4 = 22 (+ 2); fV = 4 - 2 u = 6; fcx = 2 - 2 - 1; fnTr = 1 - 1 - 1; fnFe = 5 - 4 - 4; fnGe = 4 - 3 - 3; fnTi = 5 - 5 - 5; fnTa = 15 - 14 - 13; fSol = I (0-2 - 2 - 1), II (0-1 - 2 - 1), III (0-1 -0- 0); fκ = I (1 - 1), II (1 -0), III (0-0); fζ = 2 -0-0; fε = 1 - 1 -0; fPp = 0-N-0-NNN 2-5 Nω;IP = 704; tarsus III with a short and thick inner claw; AP <MA; AA <SB. Description (measurements are given in Table 1). Holotype larva: Idiosoma oval, dorsal surface with a scutum, a scutellum and 22 dorsal setae, each arising from small sclerite except c 1 and h 1 (Fig. 1). Scutum rounded anteriorly and with rounded posterolateral angles; large, covering most of prodorsum; bearing three pairs of setae (AM, AL and PL) and one pair of trichobothria (S); punctated in most part but striated in parts anterior and slightly posterior to AM setae. AM filiform. There is a small chitinous bar (tear like) behind AM. AL and PL both thicker than AM and barbed. AL setae situated closer to PL than AM. S filiform and smooth. A large oval scutellum posterior to scutum and wider than long, with punctations and two barbed setae. Ocular sclerite, 27 long and 12 wide, situated lateral to postero-lateral angles of scutum; with 2 eyes, anterior 10, posterior 8 in diameter. All dorsal setae with distinct barbs. Ventral surface of idiosoma with one pair of intercoxal setae (3 a), 3 pairs of ventral setae located on sclerites slightly smaller than those of dorsal setae, and an anus (Fig. 2). All setae on ventral idiosoma with distinct barbs. Coxal fields punctate. A minute supracoxal seta present on anterolateral corners of dorsal coxae I. Coxa I with proximal seta 1 a, filiform and antero-distal seta 1 b, barbed. Coxa II with antero-distal seta 2 b, and antero-median seta 2 a; both barbed. Coxa III with single antero-median seta 3 b, barbed (Fig. 2). One pair of intercoxal setae 3 a between coxae III. NDV = 22 (2) + 6 = 28 (2). Gnathosoma convex posteriorly (Fig. 6). Subcapitulum punctuate. A pair of adoral setae (or) small and nude. One pair of thick subcapitular setae brush-like, distally with 6 divisions, 20 long, 8 apart at base. Cheliceral base 32 long; cheliceral blade 12 long, curved with single minute tooth distally. Palpal femur with one barbed seta. Palpal genu without seta (Fig. 6). Tibia with three nude setae (Fig. 6). Palpal tarsus with 5 nude setae, an eupathidium and a solenidion. fPp= 0-N-0-NNN 2-5 Nω. One seta on palpal tarsus long. Leg segmentation formula: 6 - 6 - 6. Leg setal formula: Leg I: Tr- 1 B; Fe- 5 B; Ge- 2 σ, 1 κ, 4 B; Ti- 2 φ, 1 κ, 5 B; Ta- 1 ω, 1 ε, 2 ζ, 13 B, 2 N (Fig. 4). Leg II: Tr- 1 B; Fe- 4 B; Ge- 1 σ, 1 κ, 3 B; Ti- 2 φ, 5 B; Ta- 1 ω, 1 ε, 14 B (Fig. 3). Leg III: Tr- 1 B; Fe- 4 B; Ge- 1 σ, 3 B; Ti- 5 B; Ta- 10 B, 3 N (Fig. 5). IP = 245 + 232 + 227 = 704 holotype IP = 241 + 220 + 219 = 680 paratype Remarks. Trombidium (Teresothrombium) barooghi belongs to the species group of this subgenus having normal AL and normal setae on scutellum and thick and brush-like subcapitular setae. Three species have this feature: T. hyperi Vercammen-Grandjean et al., 1977, T. mastigotarsum Feider, 1956 and T. southcotti Zhang & Saboori, 1996. It differs from T. hyperi by shorter AW (92–97 vs. 104–109), PW (92–97 vs. 108–114), SD (87–92 vs. 116–128), AM (30–37 vs. 43–46), LSS (99–111 vs. 117–128), leg I (241–245 vs. 292–297), leg II (220–232 vs. 278–288), leg III (219–227 vs. 273–280) and IP (680–704 vs. 845–865); from T. mastigotarsum by number of setae on Fe I–III (5 - 4 - 4 vs. 4 - 3 - 3), Ge I-III (4 - 3 - 3 vs. 5 - 3-4), shorter W (104–111 vs. 162), HS (50 vs. 65), longer SD (87–92 vs. 61) and from T. southcotti by shorter SD (87–92 vs. 120–126), AM (30–37 vs. 45–63), W (104–111 vs. 120–130), LSS (109–111 vs. 132–145). Etymology. The species is named in honour of Dr. Hassan Barooghi (professor of entomology) for his great efforts in developing entomology in Iran and exchanging entomological informations among Iranian entomologists. Types. The holotype (ARS- 20061111 - 1 a) and paratype (ARS- 20061111 - 1 b) larvae were collected by K. Haddad Irani-nejad, 15 May 2005, free-living on soil, in Tickmadash, Mianeh city, East Azarbaijan province, Iran. The holotype and paratype are deposited in the Acarological Collection, Zoological Museum, College of Agriculture, University of Tehran, Karaj, Iran.Published as part of Saboori, Alireza & Irani-Nejad, Karim Haddad, 2007, A new species of Trombidium (Acari: Trombidiidae) from East Azarbaijan province, Iran, pp. 63-68 in Zootaxa 1531 on pages 64-67, DOI: 10.5281/zenodo.17771
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Langlands–Shahidi method and poles of automorphic L-functions III: Exceptional groups
No full textAbstractIn this paper, we apply Langlands–Shahidi method to exceptional groups, with the assumption that the cuspidal representations have one spherical tempered component. A basic idea is to use the fact that the local components of residual automorphic representations are unitary representations, and use the classification of the unitary dual. We prove non-unitarity of certain spherical representations of exceptional groups. We need to divide into five different cases, and in two cases we can prove that the completed L-functions are holomorphic except possibly at 0, 1/2, 1 under some local assumptions
FIGURE 2. Basiria khouzestanensis n in Description of Basiria khouzestanensis n. sp. (Nematoda: Tylenchidae) from Iran and its phylogenetic relationships with other species in the family
No full textFIGURE 2. Basiria khouzestanensis n. sp. A&B: Female pharyngeal region, C: Lateral field at mid-body, D: Female reproductive system, E&F: Female tail, G&H: Male tail. (Scale bars = 20 µm.)Published as part of Eisvand, Payam, Nejad, Reza Farrokhi & Azimi, Sedighe, 2019, Description of Basiria khouzestanensis n. sp. (Nematoda: Tylenchidae) from Iran and its phylogenetic relationships with other species in the family, pp. 482-490 in Zootaxa 4563 (3) on page 486, DOI: 10.11646/zootaxa.4563.3.4, http://zenodo.org/record/260141
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
QuateXelero : an accelerated exact network motif detection algorithm
No full textFinding motifs in biological, social, technological, and other types of networks has become a widespread method to gain more knowledge about these networks’ structure and function. However, this task is very computationally demanding, because it is highly associated with the graph isomorphism which is an NP problem (not known to belong to P or NP-complete subsets yet). Accordingly, this research is endeavoring to decrease the need to call NAUTY isomorphism detection method, which is the most time-consuming step in many existing algorithms. The work provides an extremely fast motif detection algorithm called QuateXelero, which has a Quaternary Tree data structure in the heart. The proposed algorithm is based on the well-known ESU (FANMOD) motif detection algorithm. The results of experiments on some standard model networks approve the overal superiority of the proposed algorithm, namely QuateXelero, compared with two of the fastest existing algorithms, G-Tries and Kavosh. QuateXelero is especially fastest in constructing the central data structure of the algorithm from scratch based on the input network
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