258,424 research outputs found
Phase behaviour and crystal structures of 2′,3′-difluorinated p-terphenyl derivatives
No full textThe crystal structures of difluorine derivatives of p-terphenyls (nTm) have been determined by single-crystal X-ray diffraction. For the unsymmetrical substituted compounds 2′,3′-difluoro-4-methyl-p-terphenyl (1T0, C19H14F2) and 4-ethyl-2′,3′-difluoro-4′′-methyl-p-terphenyl (1T2, C21H18F2), the crystal structure is disordered, with molecules statistically entering the crystal in up and down orientations, with full superposition of all the atoms, except for those of the terminal groups (H/methyl for 1T0 and methyl/ethyl for 1T2). For triclinic 2′,3′-difluoro-4,4′′-dimethyl-p-terphenyl (1T1, C20H16F2), with the space group P , the two crystallographically independent molecules have the same conformation, which is different from monoclinic 1T0 (space group C2) and 1T2 (space group C2/c). A common feature of the conformation of the three compounds is the noncoplanar twisted arrangement of the three rings of the p-terphenyl moiety. Two-dimensional (2D) Hirshfeld fingerprint plots are consistent with H ... H and C ... H contacts in the crystal packing. For the three compounds, the phase behaviour has been investigated by POM (Petra/Osiris/Molinspiration) and differential scanning calorimetry (DSC) analysis. 1T2 is mesogenic, with enantiotropic nematic behaviour
Ropalidia brevita Das and Gupta 1989
No full text25) Ropalidia brevita Das and Gupta, 1989 (Figs 49 & 50) Ropalidia (Anthreneida) brevita Das & Gupta, 1989: 121. Holotype ♂, India: Delhi, University ridge (NZC). Material examined: INDIA: Goa: Sattari, Honda, 12.i.2017, 2♀, coll. Sandesh M. Gawas; Bicholim, Sanquelim, 18.iii.2017, 3 ♀ & 1♂, coll. Sandesh M. Gawas; Tiswadi, Salim Ali Bird Sanctuary, 3♀ & 5♂, 14 & 19.v.2018, coll. P. Girish Kumar & Party, ZSIK Regd. Nos. ZSI/ WGRC /I.R.-INV.11638–11645; Tiswadi, Carambolim lakeside, 1♀, 19.v.2018, coll. P. Girish Kumar & Party, ZSIK Regd. No. ZSI/ WGRC /I.R.-INV.11646. Distribution. India: Assam, Chhattisgarh, Delhi, Goa, Gujarat, Haryana, Himachal Pradesh, Karnataka, Kerala, Madhya Pradesh, Odisha, Rajasthan, Sikkim, Tamil Nadu, Uttarakhand, Uttar Pradesh, West Bengal. Global: Pakistan. (Girish Kumar et al. 2017a).Published as part of Gawas, Sandesh M., Kumar, P. Girish, Gupta, Ankita & Sureshan, P. M., 2019, Checklist of vespid wasps (Hymenoptera: Vespidae) of Goa, India, with new records and a key to species, pp. 269-294 in Zootaxa 4585 (2) on page 280, DOI: 10.11646/zootaxa.4585.2.3, http://zenodo.org/record/263730
matthew-p-brown/E_cells_2023: E_cells_2024
No full text<p>This page contains the code used to analyze behavior and voltage imaging data from <strong>Brown et al., 2024</strong>. Further questions can be sent to the corresponding author, Dr. Mark N. Wu ([email protected]).</p>
Study of microstructure of chill cast aluminium bronzes (Cu-AI-Fe-Mn)
No full textSUBSTANTIAL information is available on the microstru-ctures of high tensile aluminium -bronzes but most of
the literature is pertaining to the alloys containing nickel. Exhaustive amount of work was carried out by Gupta et al. at the National Metallurgical Laboratory
to study the mechanical properties of aluminium-bronze alloys in the chill-cast condition without nickel addition, the results of which have already been reported in an earlier paper. The present paper relates
to the study of microstructures of these chill-cast aluminium-bronze alloys. A few microstructures of
Cu-Al-Fe system have been given by Copper Development Association in their recent publication on aluminium-bronzes.
Agonocryptus bicolor Gupta 1982
No full textAgonocryptus bicolor Gupta, 1982 (Fig. 18E) Agonocryptus bicolor Gupta, 1982. Original description, female, keyed, map. Agonocryptus bicolor: Yu et al., 2016. Catalog. Distribution. Mexico (Oaxaca) (Fig. 18E). Known from a single specimen collected at 900 m (not “ 9000 m ” as in Gupta, 1982). Material examined. Literature data.Published as part of Supeleto, Fernanda A. & Aguiar, Alexandre P., 2022, One hundred new records, a new species, and the first pictures of Agonocryptus Cushman (Hymenoptera, Ichneumonidae, Cryptinae), pp. 547-576 in Zootaxa 5178 (6) on page 551, DOI: 10.11646/zootaxa.5178.6.3, http://zenodo.org/record/703742
Agonocryptus leurosus Gupta 1982
No full textAgonocryptus leurosus Gupta, 1982 (Fig. 19F) Agonocryptus leurosus Gupta, 1982. Original description, subspecies assignment, female, keyed, map. Agonocryptus leurosus: Yu et al., 2016. Catalog. Distribution. Brazil (Goias, Mato Grosso, Rondonia) (Fig. 19F). Material examined. Literature data.Published as part of Supeleto, Fernanda A. & Aguiar, Alexandre P., 2022, One hundred new records, a new species, and the first pictures of Agonocryptus Cushman (Hymenoptera, Ichneumonidae, Cryptinae), pp. 547-576 in Zootaxa 5178 (6) on page 558, DOI: 10.11646/zootaxa.5178.6.3, http://zenodo.org/record/703742
Agonocryptus rufigaster Gupta 1982
No full textAgonocryptus rufigaster Gupta, 1982 (Fig. 20B) Agonocryptus rufigaster Gupta, 1982. Original description, male and female, keyed, map. Agonocryptus rufigaster: Yu et al., 2016. Catalog. Distribution. Surinam (Paramaribo) (Fig. 20B). Material examined. Literature data.Published as part of Supeleto, Fernanda A. & Aguiar, Alexandre P., 2022, One hundred new records, a new species, and the first pictures of Agonocryptus Cushman (Hymenoptera, Ichneumonidae, Cryptinae), pp. 547-576 in Zootaxa 5178 (6) on page 563, DOI: 10.11646/zootaxa.5178.6.3, http://zenodo.org/record/703742
Universal Statistical Properties of Inertial-particle Trajectories in Three-dimensional, Homogeneous, Isotropic, Fluid Turbulence
No full textWe obtain new universal statistical properties of heavy-particle trajectories in three-dimensional, statistically steady, homogeneous, and isotropic turbulent flows by direct numerical simulations. We show that the probability distribution functions (PDFs) P(Φ), of the angle Φ between the Eulerian velocity u and the particle velocity v, at a point and time, scales as P(Φ) ∼Φ−, with a new universal exponent ≃ 4
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