115,577 research outputs found
L.Pacini Savoj-V.V. Ivanov
No full textViene qui pubblicata la corrispondenza di Pacini e Ivanov conservata presso il Centro Studi Vjačeslav Ivanov, Roma. Si tratta di una riedizione delle lettere già pubblicate da me nel 2011, su "Russkaja literatura", inserite qui assieme ad altri materiali epistolari nella sezione "Iz epistoljarnogo nasledija Vjač. Ivanova
Correlation analysis of frustrated tunneling ionization
No full textWe visualize frustrated tunneling ionization (FTI) using the correlation function analysis outlined in our preceding works [I. Ivanov and K. T. Kim, J. Phys. B 55, 055001 (2022)0953-407510.1088/1361-6455/ac5813; Sci. Rep. 12, 19533 (2022)2045-232210.1038/s41598-022-24168-8]. We apply this technique to the hydrogen atom subjected to a strong laser field. Our analysis supports the basic premises of the theory of FTI and demonstrates its sensitive dependence on the laser pulse duration and carrier envelope phase. © 2023 American Physical Society.11Nsciescopu
Circulation and hydrographic characteristics of the Black Sea during July 1992
No full textHydrographic measurements performed during July 1992 are used to infer sub-basin and mesoscale circulation and water mass characteristics of the Black Sea. A notable feature of the circulation is the convoluted cyclonic boundary current system with distinctly different T, S characteristics. The coastal side of the Rim Current is characterized by a series of mesoscale eddies. The interior has a weaker circulation and little marked structure within an elongated low pressure cell. The baroclinic geostrophic flow field is vertically coherent and possesses smaller amplitude meanders as compared with the previous September 1991 observation (Oguz et al.,1994). In the northwestern shelf region, the fresh water inflows from the Danube as well as Dniepr and Dniestr Rivers give rise to a strong coastal salinity front confined above the seasonal thermocline. Both the coastal current and the Rim Current exhibit strong onshore-offshore meanders, indicating significant interaction between the interior and northwestern shelf waters. The influence of the fresh water inflow can be traced up to the east of the Bosphorus exit region, similar to 32 degrees E. The anoxic interface, identified by the 16.2 sigma-t surface, is located at levels deeper than 150 m along the coast, but is elevated sharply across the Rim Current frontal zone to its shallowest position of about 100m within the interior cyclonic cell
Tinodes isalo Melnitsky & Ivanov, 2016, new species
No full text<i>Tinodes isalo</i> new species <p>(Figs 2 A–E)</p> <p>Holotype: male. Length of each forewing 3.5 mm, body length 2.5 mm. Abdomen, wings and thorax light brown. Head and legs pale yellowish. Antennae, palpi, tibiae, and tarsi covered with long dark hairs. Abdominal sternite V with small lateral cuticular sclerites associated with ducts of sternal pheromone glands.</p> <p> <b>Male genitalia.</b> Ventral part of annular segment IX wide in lower part and shorter dorsally, its posterior margin well sclerotized (Fig. 2 A). Dorsal part of segment IX connected to ventral by narrow neck well developed, strongly dilated, its lateral surface somewhat convex in dorsal view (Fig. 2 B), posteroventral margin slightly concave. Long preanal appendages curved slightly downwards (Fig. 2 A) and straight in dorsal view (Fig. 2 B), with numerous long hairs. Gonocoxite (basal segment) of each gonopod (inferior appendage) about as long as broad in lateral view; with sclerotized and almost straight posterior margin (Fig. 2 A); gonostyle (apical segment) narrow, curved slightly dorsad and mesad, subequal to gonocoxite, with small sclerotized mesal tuberculi at base (Figs. 2 A, 2C). Aedeagus (Fig. 2 A, 2D, 2E) curved ventrad, with enlarged membranous apical part and long straight dorsolateral projections of phallobase ("paraproctal processes" of Johanson & Oláh 2007) provided with 3 pairs of strong lateral spines (Figs. 2 D, 2E); ventral part of phallobase sclerotized with deep incision; strong transversal spine directed to left side visible inside apical part of aedeagus (Fig. 2 D).</p> <p> This species is similar to <i>Tinodes irwini</i> Johanson & Oláh 2007 from Madagascar (Finarantsoa Province, Ranomafana National Park, about 250 km NE from Isalo National Park) and differs from it in the shape and proportions of the inferior appendages in which the gonostyles are undivided in <i>T</i>. <i>isalo</i> (each bifid with a short dorsal and a long posteroventral branch in <i>T</i>. <i>irwini</i>); in the almost straight preanal appendages of <i>T</i>. <i>isalo</i> (curved laterad basally in <i>T. irwini</i>); and the structures of aedeagus having dorsolateral projections ("paraproctal sclerites") straight and longer than the phallobase with 3 lateral spines, whereas in <i>T</i>. <i>isalo</i> these projections are shorter curved lateral projections of the phallobase possessing 2 short and 2 very long spines. The aedeagus in the new species has a shorter transversal spine, but in <i>T. irwini</i> it has larger spines along the aedeagus.</p> <p>The female sampled with this male might be conspecific with it. The female has a long and slightly curved abdominal segment IX; lack of adequate female descriptions in this genus makes impossible a comparison with other species.</p> <p> <b>Distribution.</b> Madagascar: Ihorombe region.</p> <p> <b>Material.</b> Holotype male, Madagascar, 5 km WNW Ranohira, Isalo National Park, small river, 22º32'21.06”S, 45º22'37.36”E, 802 m, 17.vii.2014; leg. V. Ivanov, S. Melnitsky.</p>Published as part of <i>Melnitsky, Stanislav I. & Ivanov, Vladimir D., 2016, A new species of Tinodes (Trichoptera: Psychomyiidae) from Madagascar, pp. 390-392 in Zootaxa 4136 (2)</i> on page 392, DOI: 10.11646/zootaxa.4136.2.10, <a href="http://zenodo.org/record/261715">http://zenodo.org/record/261715</a>
Agathis semiaciculata IVANOV 1899
No full textAgathis semiaciculata IVANOV 1899 M a t e r i a l e x a m i n e d: Golestan province: Amol, 2, summer 2007. G e n e r a l d i s t r i b u t i o n Switzerland (SIMBOLOTTI & ACHTERBERG 1999), Ukraine, Azerbaidzhan (Mts Caucasus), Kazakhstan, Greece (PAPP 2003).Published as part of Sakenin, H., Naderian, H., Samin, N., Rastegar, J., Tabari, M., Papp, J. & I, Northern, 2012, On a collection of Braconidae (Hymenoptera) from northern Iran, pp. 1319-1330 in Linzer biologische Beiträge 44 (2) on page 1321, DOI: 10.5281/zenodo.533526
Vjačeslav Vsevolodovič Ivanov
No full textComment évoquer la mémoire d’une personnalité hors pair, polyglotte qui avait du mal à dire combien de langues il connaissait, linguiste, mathématicien, sémioticien, anthropologue, historien de la littérature et de la culture, poéticien et poète, traducteur, mémorialiste, auteur d’un nombre considérable d’ouvrages et d’articles dans tous ces domaines ? À peine a-t-on avancé un qualificatif que l’on en perçoit instantanément le caractère restrictif. L’aura de Vjačeslav Ivanov..
Melitta (Cilissa) budashkini Radchenko & Ivanov, sp. nov.
No full textMelitta (Cilissa) budashkini Radchenko & Ivanov sp. nov. Type material. Holotype male, 3 male paratypes and 15 female paratypes, I.I. Schmalhausen Institute of Zoology National Academy of Sciences of Ukraine, (IZAN, Kiev, Ukraine): Ukraine, Crimea, Feodosia, Cape Chauda, 45 °00’ 17 ’’N 35 ° 49 ’ 49 ’’E, steppe zone on Limonium meyeri (Plumbaginaceae), 16.ix. 2011, leg. Yu. Budashkin (33 including holotype and 12 Ƥ), S. Ivanov (13 and 1 Ƥ) & A. Ivanov (2 Ƥ); and 6 female paratypes, same place on Linosyris villosa (Asteraceae), 16.ix. 2004, leg. Yu. Budashkin, IZAN. Additional material. 13 and 6 Ƥ collected from the same place and date as the holotype, but dissected for morphological studies and DNA extraction, leg. Yu. Budashkin. Etymology. Named after Yu. I. Budashkin, who collected a large part of the type series. Diagnosis. M. budashkini shows diagnostic features of the subgenus Cilissa: scutum smooth between punctures, male S 7 with apicolateral part pointed and male gonostylus shorter than gonocoxite. Volsella and apicolateral part of male S 7 are apically pointed like in M. ezoana, M. magnifica sp. nov. and M. sibirica, but the gonostylus is straight in M. budashkini male while it is curved distally in M. ezoana and M. sibirica. S 7 of M. budashkini with a blade-shaped apicolateral process that has an additional protrusion at the base of the spike-like process in M. ezoana. S 7 is weakly incised apically. Base of female propodeal triangle with vertical carinae (Fig. 2 g) and outer surface of galea mat like in M. ezoana and M. sibirica, but prepygidial fimbria of female M. budashkini is mainly white while being dark or predominantly dark like in M. sibirica. T 2–4 of female M. budashkini with much wider white apical hair bands than in M. sibirica and M. ezoana. Mesoscutum and scutellum with larger punctures than in M. sibirica. In contrast to M. ezoana the M. budashkini female metabasitarsus is straight proximally. Posterior scutum, anterior scutellum and anterior metanotum sparsely punctate. Description 3 (Figs 2–3). Body length: 10.5–10.7 mm. Head. L = 2.6 mm. W = 3.1 mm. Integument black including all segments of antenna, but with small reddish-brown patches on the middle of mandibles. Segments of antennal flagellum slightly curved ventrally. Compound eyes slightly converging below. Clypeus convex. Face covered with silver-white hairs, but vertex with scattered small dark hairs (Fig. 2 c). Mesosoma. L = 3.3 mm. W (between tegulae) = 2.4 mm. Cuticle black. Mesoscutum and scutellum densely punctate with large dots, sparse in the central parts of the mesoscutum and laterally on the scutellum (i>d), smooth between punctures (Fig. 2 i). Thorax dorsally covered with a dirty gray hairs, propodeum and sides of mesosoma with a silver-white pubescence. Legs. All legs are black, except for brown pretarsi. Legs with white pubescence except first tarsus which is covered with black or brown hairs on the inside. Wings. Wings slightly dark. Metasoma. L = 5.2 mm. W = 3.5 mm. All terga are densely punctate (i<d), smooth and shiny between punctures. Terga lightened apically, on T 2–3 margins slightly depressed across the entire width of terga while on other terga only the lateral parts are depressed. Apical parts of all sterna yellowish translucent. S 6–8 like in Figs 3 d–f. Gonostylus shorter than gonobase with the middle of the ventral part having a flattened hemispherical protrusion (Figs 3 b–c). Ƥ (Figs 2, 4). Body length: 11–12 mm. Head. L = 3.1 mm. W = 3.5 mm. Integument black except ventral side of antenna and small patches in the middle of the mandibles which are reddish-brown. Inner margins of compound eyes almost parallel (Fig. 2 d). Face and vertex densely punctate except for the parts close to the lateral ocelli and below the central ocella. Clypeus wider than long. Vestiture greyish-white at vertex mixed with grey and brown hairs. Outer surface of galea slightly shiny and sculptured (densely punctate with small dots – i<d). Face, except vertex, completely covered with silver-white hairs. Mesosoma. L = 3.8–3.9 mm. W = 2.7–2.9 mm. Cuticle black. Mesoscutum and scutellum punctate like male. Propodeal triangle is sculptured and slightly shiny between the ribs (Fig. 2 g). Thorax dorsally covered with yellowish-brown or yellowish-gray hairs, otherwise covered in white pubescence. Legs. All legs are black, except for brown pretarsi. Tibia and first tarsus of legs are covered with black hairs on the inner side and on the outer side with silver-white pubescence except for the proximal part of tibia below the hind metabasitibial plate where are also black hairs. Wings. See male. Metasoma. L = 5.5–6.8 mm. W = 4.2–4.5 mm. All terga are black and densely punctate (i<d), smooth and shiny between punctures. The apical margin of terga black, slightly depressed laterally. T 1–4 with white apical hair band twice as broad as width of apical margin. Basal and apical margins of S 1–4 yellowish with apical bands of white erect hairs. Pp as in Fig. 2 h. Floral visitation. Most specimens were collected on Limonium meyeri (Boiss.) Kuntze (Plumbaginaceae) but six females were found on Galatella villosa (L.) Rchb.f. (= Linosyris villosa (L.) DC.) (Asteraceae). The species might be eclectic oligolege (sensu Müller & Kuhlmann 2008) but palynological analysis is required for confirmation. Biotope. Only found in xerophytic steppe. Distribution. Crimea. Only known from the type locality. Comment. M. budashkini seems to be closely related to M. ezoana and M. sibirica. The latter two species show wider East-Palaearctic distribution (Michez & Eardley 2007). Crimea could have been an isolated glacial refugia where M. budashkini shifted on alternative host-plants. All females of M. budashkini have been collected foraging on Plumbaginaceae or Asteraceae while M. ezoana and M. sibirica are Fabaceae specialist and generalist respectively (Michez et al. 2008).Published as part of Michez, Denis, Kuhlmann, Michael, Ivanov, Sergey P. & Radchenko, Vladimir G., 2012, Description of four new species in the bee genus Melitta Kirby, 1802 (Hymenoptera: Melittidae), pp. 57-67 in Zootaxa 3337 on pages 58-61, DOI: 10.5281/zenodo.28134
Letter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
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