34,503 research outputs found
Concomitant formation of differently coordinated copper(II) complexes in the same reaction: Structural studies of [trans-Cu(γ-picoline) 2(H 2O) 4](p-toluene sulfonate) 2·2H 2O and [trans-Cu(γ-picoline) 4](p-toluenesulfonate) 2·2H 2O
No full textTwo new copper(II) complexes comprising of coordinated and non-coordinated p-toluenesulfonate, [trans-Cu(γ-pic) 2(H 2O) 4](pts) 2·2H 2O, 1 and [trans-Cu(γ-pic) 4(pts) 2]·2H 2O, 2 (where p-toluenesulfonate = pts and γ-picoline = γ-pic) have been isolated from the same reaction mixture. These complexes have been characterized by spectroscopic techniques, molar conductance, TGA, magnetic susceptibility studies, and single crystal X-ray structure determination. Both complexes crystallize in the monoclinic crystal system with P2 1/c space group having cell dimensions of a = 8.0203(2) , b = 19.4471(4) , c = 10.3000(3) , β = 93.4420(9)°, V = 1603.61(7) 3, (Z = 2) in 1 and a = 10.1473(2) , b = 10.9948(2) , c = 18.0952(5) , β = 93.0340(9)°, V = 2015.96(8) 3, (Z = 2) in 2. Single -crystal X-ray structure determinations revealed the presence of ionic complex, viz: one complex cation [trans-Cu(γ-pic) 2(H 2O) 4], two pts anions and two water molecules of crystallization in the complex 1 and neutral [trans-Cu(γ-pic) 4(pts) 2] and two water molecules of crystallization in 2. The crystal packing in both complexes is stabilized by OH⋯O, CH⋯O hydrogen bonds and CH⋯π interactions
On the structure and origin of pressure fluctuations in wall turbulence: predictions based on the resolvent analysis
No full textWe generate predictions for the fluctuating pressure field in turbulent pipe flow by re-formulating the resolvent analysis of McKeon & Sharma (2010) in terms of the so-called primitive variables. Under this analysis, the nonlinear convective terms in the Fourier-transformed Navier-Stokes equations are treated as a forcing that is mapped to a velocity and pressure response by the resolvent of the linearized Navier-Stokes operator. At each wavenumber-frequency combination, the turbulent velocity and pressure field are represented by the most-amplified (rank-1) response modes, identified via a singular value decomposition of the resolvent. We show that these rank-1 response modes reconcile many of the key relationships between the velocity field, coherent structure (i.e., hairpin vortices), and the high-amplitude wall-pressure events observed in previous experiment and DNS. A Green’s function representation shows that the pressure fields obtained under this analysis correspond primarily to the fast pressure contribution arising from the linear interaction between the mean shear and the turbulent wall-normal velocity. Recovering the slow pressure requires an explicit treatment of the nonlinear interactions between the Fourier response modes. By considering the velocity and pressure fields associated with the triadically-consistent mode combination studied by Sharma & McKeon (2013), we identify the possibility of an apparent amplitude modulation effect in the pressure field, similar to that observed for the streamwise velocity field. However, unlike the streamwise velocity, for which the large scales of the flow are in phase with the envelope of the small-scale activity close to the wall, we expect there to be a ?/2 phase difference between the large scale wall-pressure and the envelope of the small-scale activity. Finally, we generate spectral predictions based on a rank-1 model assuming broadband forcing across all wavenumber-frequency combinations. Despite the significant simplifying assumptions, this approach reproduces trends observed in previous DNS for the wavenumber spectra of velocity and pressure, and for the scale-dependence of wall-pressure propagation speed
The Folio: F. C. C. Magazine
No full textMaqbool Ahmad Bhatty-Editorial-Before We Part. pp. 1-2; Adya Sharan Sharma-Article-Swami Ram Tirtha. pp. 2-4; B. R. P.-The Master of My Ruined Garden. pp. 4; Ayoob Ali-Art. pp. 4-5; Gilani, S. A. S.-Poetry-The Sacred Shrine. pp. 5-6; Anupam Dhar-Kashmiri Marriages. pp. 6-8; Nazir Latif-The Bookworm. pp. 8; Hans-Article-Study of Macbeth as a Tragic Hero. pp. 9-10; Laroia, V. K.-Professional Error. pp. 10-11; Saran Singh-The Days of Our Glory. pp. 11-12; Manmohan Mehta-Article-The Short Story in England. pp. 12-13; [Hindi]. 4 p.; Punjabi Phulvari [Punjabi]. 4 p.; The Folio [Urdu]. 6 p.Dr. C. H. Rice, M.A., Ph.D., LL.D., Vice Chancellor, University of the Punjab. after page 1
Opposition control within the resolvent analysis framework
No full textThis paper extends the resolvent analysis of McKeon & Sharma (2010) to consider flow control techniques that employ linear control laws, focusing on opposition control (Choi et al. 1994) as an example. Under this formulation, the velocity field for turbulent pipe flow is decomposed into a series of highly amplified (rank-1) response modes, identified from a gain analysis of the Fourier-transformed Navier-Stokes equations. These rank-1 velocity responses represent propagating structures of given streamwise/spanwise wavelength and temporal frequency, whose wall-normal footprint depends on the phase speed of the mode. Opposition control, introduced via the boundary condition on wall-normal velocity, affects the amplification characteristics (and wall-normal structure) of these response modes; a decrease in gain indicates mode suppression, which leads to a decrease in the drag contribution from that mode. With basic assumptions, this rank-1 model reproduces trends observed in previous DNS and LES, without requiring high-performance computing facilities. Further, a wavenumber-frequency breakdown of control explains the deterioration of opposition control performance with increasing sensor elevation and Reynolds number. It is shown that slower-moving modes localized near the wall (i.e. attached modes) are suppressed by opposition control. Faster-moving detached modes, which are more energetic at higher Reynolds number and more likely to be detected by sensors far from the wall, are further amplified. These faster-moving modes require a phase lag between sensor and actuator velocity for suppression. Thus, the effectiveness of opposition control is determined by a trade-off between the modes detected by the sensor. However, it may be possible to develop control strategies optimized for individual modes. A brief exploration of such mode-optimized control suggests the potential for significant performance improvement
Rare and novel epidermal growth factor receptor mutations in non-small-cell lung cancer and lack of clinical response to gefitinib in two cases
No full textLetter to the editorAmit Sharma, Thean H. Tan, Glenice Cheetham, Hamish S. Scott, Michael P. Brow
Second sphere coordination complexes: Synthesis, characterization, single crystal structure and packing analyses of [trans-Cu(en)2(H2O)2](L1/L2)2 where L1 = p-toluenesulphonate, L2 = 5-bromo-2-methoxybenzenesulphonate
No full textTwo new copper(II) complexes of composition [trans-Cu(en)2(H2O)2](L1)2, 1 and [trans-Cu(en)2(H2O)2](L2)2, 2 (L1 = p-toluenesulphonate, L2 = 5-bromo-2-methoxybenzenesulphonate) were obtained by the addition of ethylenediamine to hydrated Cu(II) sulphonates, Cu(L1/L2)2·nH2O in methanol–water solution. The newly synthesized complex salts have been characterized by elemental analyses, TGA, spectroscopic techniques (electronic and FT-IR), magnetic moment determination and conductance measurements. The complex salt 1 crystallizes in the monoclinic system with space group P21/c and complex salt 2 crystallizes in the triclinic system with space group P. X-ray structure determination revealed ionic structures consisting of one complex cation [Cu(en)2(H2O)2]2+ and two respective sulphonate anions in 1 and 2. A three dimensional hydrogen bonding network formed by N–H...O, C–H...O and O–H...O through second sphere interactions besides electrostatic forces of attraction stabilize crystal lattice in both complex salts
Paraleptomenes darugiriensis Kumar, Carpenter & Sharma, sp. nov.
No full text2. Paraleptomenes darugiriensis Kumar, Carpenter & Sharma sp. nov. (Figs 1–6) Diagnosis. This species can be differentiated from all other Indian subcontinent species by having the following combination of characters: clypeus of female without large punctures; occipital carina distinctly sinuate at middle of vertex; scutellum convex; metanotum oblique; maximum width of T 1 1.42 x its median length; transverse groove on T 1 preapically not very broad and deep; punctation of T 2 not very coarse, punctures are considerably smaller than those of pronotum or mesoscutum; T 2 normal without hump; last antennal article of male (Fig. 5) expanded towards the apex, not finger-like and not straight. Description. Female (holotype) (Fig. 1). Head. 1.05 x as wide as long in frontal view (Fig. 2); clypeus slightly convex, pyriform, transverse anteriorly, with two longitudinal carinae, the space between them with fine sparse punctures and few indistinct longitudinal striations, maximum width 1.05 x length medially; mandibles on inner side with four sharp teeth; maxillary palp 6 -segmented; labial palp 4 -segmented; interantennal space almost smooth; frons closely, strongly and rugosely punctured, interspaces weakly carinate; ocular sinus with weak punctures; area between the antennal toruli and inner eye margin almost smooth; POL as long as OOL; diameter of anterior ocellus as long as the distance between anterior ocellus and posterior ocelli; vertex and upper half of temple strongly punctured; cephalic fovea absent; tempora 0.50 x as wide as eye in profile (measured through its ocular sinus); interocular distance 1.41 x greater on vertex than at clypeus; occipital carina strong, complete and narrowed ventrally, distinctly sinuate at middle of vertex. Antenna 3.29 x farther from each other than from eyes; antennal scape 3.68 x as long as F 1; F 1 1.05 x as long as F 2; flagellomeres widening towards apex except last antennal article; apical antennal article 0.93 x as long as wide. Mesosoma. Dorsal surface of mesosoma convex in profile view; anterior face of pronotum with two almost coalesced weak foveae, punctate laterally, interspaces weakly carinate, lower side of anterior face of pronotum smooth without punctures; pronotal carina weak towards middle, at middle carina absent, strong towards lateral sides and reaching the lateral margin of pronotum; posterior face and lateral sides of pronotum (except lateral corner with few transverse striations), mesoscutum and scutellum strongly, closely and rugosely punctate, interspaces carinate; median length of mesoscutum as long as its maximum width; scutellum convex except first raw of scutellar sculpture deeply impressed, interspaces strongly carinate; metanotum very oblique, with weak rugose punctures, except at posterior margin smooth; propleuron almost smooth; mesopleuron rugosely punctured except large area of epicnemium and posterior margin smooth; epicnemial carina distinct; upper metapleuron transversely striated, lower metapleuron almost impunctate with weak transverse striations on vertical groove. Propodeum vertical; concave-truncate posteriorly; punctures on dorsolateral area rugoso-reticulate with interspaces carinate; posterior concave area of propodeum smooth except at anterior margin with rugoso-reticulate punctures; median carina present at smooth concave area; lateral sides of propodeum with strong rugoso-reticulate punctures towards posterior margins and weaker punctures towards metapleuron; submarginal carina projecting as a rounded lobe above propodeal valvula; propodeal valvula broadly rounded. Tegula not evenly rounded posteriorly, emarginate adjoining parategula; parategula exceeding tegula at apex; axillary fossa broadly rounded. Fore wing length 3.70 x its maximum width, prestigma 0.20 x pterostigma, second submarginal cell not petiolate, both recurrent veins received in submarginal cell II. Metasoma (Fig. 3). T 1 with maximum width 1.42 x as long as median length, 0.76 x as wide as T 2 in dorsal view; T 1, T 2 & S 2 with narrow crenulate apical lamellae; the narrow basal part of S 1 smooth, posterior transverse area of S 1 with rather irregular striations; transverse groove on T 1 pre apically not very broad and deep; punctures of T 1, T 2 & S 2 considerably smaller than those of pronotum or mesoscutum; dorsal face of T 1 closely punctate, diameter of punctures on average greater than the distance between punctures, ventral face with sparse punctures; T 2 without hump, diameter of punctures on average equal to the distance between punctures; S 2 with diameter of punctures on average less than the distance between punctures; visible part of T 3 –T 5 closely punctate and visible part of S 3 –S 5 less closely punctate. Colour. Body black (metasoma brownish black) with yellow and reddish brown markings. Yellow markings are as follows: a mark at base of mandibles; spots on each side of clypeus at base; a vertical spot above clypeus in interantennal space extends up to lower frons; at emargination of eyes; a line behind eyes at tempora; ventral side of scape; a band on dorsal side of pronotum; tegula (except brownish yellow at middle); parategula; a band on metanotum; apex of fore and mid femora; outer face of fore and mid tibia; transverse bands on apical margins of T 1, T 2 & S 2, narrower on T 1 and broader on T 2 & S 2. Reddish brown markings are as follows: at mandible; at ventral side of apical flagellomeres. Tarsi brownish yellow. Wings slightly infuscate, prestigma and stigma dark brown. Pilosity not prominent. Size. 6 mm. Male. Head (Fig. 4) 1.18 x as wide as long in front view; interocular distance 1.60 x greater on vertex than at clypeus; apex of clypeus (Fig. 4) deeply emarginate, maximum width 1.30 x length medially; POL 1.39 x OOL; antenna (Fig. 5) with the last article hook-like, reaching to the basal margin of eleventh antennal article in curved position, last antennal article expanded towards the apex, not finger-like and not straight; genitalia as in figure 6, apical tip of aedeagus rounded, parallel spines elongate without hairs. Other characters are almost same as in female. Colour as that of female except clypeus entirely yellow. Size: 5.5–6 mm. Variations. One paratype from Sikkim has reddish brown markings instead of yellow. Material examined. Holotype ♀, INDIA. Meghalaya, East Garo Hills distr., Darugiri, 14–20.v. 1979, Coll. S.B. Roy & Party, NZC No. 14718 /H 3. Paratypes: 1 ♂, same data of holotype, NZC No. 14719 /H 3; 1 ♀, Arunachal Pradesh, Papumpare distr., Itanagar, 5.ii. 2001, Coll. P.T. Bhutia & Party, NZC No. 14720 /H 3; 1 ♀, Assam, North Cachar distr., Dehangi, 23–24.v. 1979, Coll. S.B. Roy & Party, NZC No. 14721 /H 3; 1 ♀ & 1 ♂, Sikkim, exact collection locality not known, September 1897, Coll. Dudgeon, NZC Nos. 14722 /H 3 & 14723 /H 3; 1 ♂, West Bengal: Darjeeling distr., Kalimpong, 9.ix. 2012, Coll. B. Mitra & Party, NZC No. 14724 /H 3. Etymology. The species is named after the locality (Darugiri) where the holotype was collected. Distribution. India (Arunachal Pradesh, Assam, Meghalaya, Sikkim, West Bengal). Discussion. This new species comes close to Paraleptomenes communis Giordani Soika but distinctly differs in having the last antennal article of the male expanded towards the apex, not finger-like and not straight (in P. communis last antennal article of male small, slender, finger-like and almost straight). In the new species the mesepisternum lacks a yellow mark (in P. c om m u ni s mesepisternum with yellow mark).Published as part of Kumar, Girish P., Carpenter, James M. & Sharma, Gaurav, 2014, A review of the genus Paraleptomenes Giordani Soika, 1970 (Hymenoptera: Vespidae: Eumeninae: Odynerini) from the Indian subcontinent, with the description of a new species from the eastern Himalayas, pp. 131-143 in Zootaxa 3802 (1) on pages 133-135, DOI: 10.11646/zootaxa.3802.1.11, http://zenodo.org/record/25008
Binding of fluorine containing anions by new cationic Co(III) complex: Competitive interaction of chloride and hexafluorophosphate with [Co(phen)(H2biim)2]3+
No full textA new mixed ligand cobalt(III) complex salt [Co(phen)(H2biim) 2]Cl3 (1) (where phen = 1,10-phenanthroline, H 2biim = 2,2′-biimidazole) has been synthesized for the first time. In an effort to explore this new cationic complex [Co(phen)(H 2biim)2]3+ as binding agent for fluoroanions, complex salt [Co(phen)(H2biim)2](PF6) 2Cl·2H2O(2) has been synthesized and characterized. Single crystal X-ray structure determination has revealed that complex salt 2 crystallizes in monoclinic crystal system with space group P21/c and consist of one complex cation, one chloride, two hexafluorophosphate anions and two water molecules of crystallization. The packing analyses revealed that the complex cations are arranged in such a way that N-H groups of biimidazole moiety are involved in N-H⋯Cl interaction with chloride ion while C-H groups of phen/H2biim are involved in C-H⋯F interaction with hexafluorophosphate to keep these groups in close proximity. A strong network of hydrogen bond interactions C-H⋯F, N-H⋯O, N-H⋯Cl, C-H⋯O (water) and O-H⋯O (water) are responsible for the stabilization of 3D supramolecular architecture. To the best of our knowledge, this is the first crystal structure of any salt containing the cation [Co(phen)(H2biim)2]3+. © 2011 Elsevier B.V. All rights reserved
Second sphere coordination in anion binding: Synthesis, characterization and X-ray structure of cis-diazidobis(ethylenediamine)cobalt(III) mesitylenesulphonate hemihydrate
No full textcis-diazidobis(ethylenediamine)cobalt(III) mesitylenesulphonate hemihydrate, [cis-Co(en)(2)(N-3)(2)]C(9)H(11)SO(3)(.)0.5H(2)O was crystallized from a solution of cis-diazidobis(ethylenediamine) cobalt(III) nitrate and sodium mesityleriesulphonate in aqueous medium in 1:1 molar ratio. Elemental analysis, spectroscopic studies (IR, UV/visible, H-1 and C-13 NMR) and conductance studies were undertaken for characterizing the complex salt. The compound crystallizes in the triclinic space group P-I with a=7.15220(10), b=14.5218(3), c=20.6925(5), V= 2058.48(7), Z=4. X-ray structure determination revealed an ionic structure consisting of [cis-Co(en)(2)(N-3)(2)](+) cation, mesitylenesulphonate anion and half water molecule. In the complex cation [cis-Co(en)2(N3)2](+), the cobalt(III) is bonded to six nitrogen atoms, originating from two ethylenediamines, and two azide groups showing an octahedral geometry around cobalt. The crystal lattice is stabilized by electrostatic forces of attraction and hydrogen bonding interactions predominantly N-H...O-, suggesting that [cis-Co(en)(2)(N-3)(2)](+) is a promising anion receptor for the mesitylenesulphonate ion. This is the first report of a sulphonate salt containing the present cationic cobaltammine
The Folio: F. C. C. Magazine
No full textSharma, O. P.-Editorial. pp. 1-2; Strickler, H. J.-Speech-Treasure, New and Old. pp. 2-10; Sir Maharaj Singh-Speech-Convocation Address. pp. 10-13; Pasricha, K. L.-Speech-Valedictory Address. pp. 14-16; Velte, F. M.-Article-The Place of Sport in our Colleges. pp. 16-21; Sharma, O. P.-Poetry-A Call to the Spirit. pp. 21; Letters to the Editors. pp. 22-25; Singh, V. Z.-Poetry-The First Signs. pp. 25; Thoughts on the Eve of New Year. pp. 25-27; Creighton, W.-Co-Eds'Corner. pp. 27-28; Sharma, O. P.-The Fifteen. pp. 28-31; Societies. pp. 31-35; News & Notes. pp. 35-36; Halls of Residence. pp. 36-38; Sports. pp. 38-39; Obituary. pp. 39-40; Poetry-An Elegy. pp. 40; [Hindi]. 16 p.; The Folio [Urdu]. 16 p.The Fifteen 1941-42. after page 3
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