5,813 research outputs found
Harpyia nadiae Morozov 2013
No full text51. Harpyia nadiae Morozov, 2013 (new record for India) (Figs. 23, 51) Harpyia nadiae Morozov, 2013; Tinea 22: 182. TL: China, West Yunnan, Wudingshan, N-Xiangyan. Material examined. India: 1 ♂, Manipur, Ukhrul district, Shirui Hill (Site 1), 25.1264°N 94.4357°E, 1930 m, 13.III.2019, in coll NCZ, ZSI, Registration no. 11532/H10; 2 ♂♂, Shirui Hill (Site 2), 25.1236°N 94.4408°E, 2036 m, 24.VII.2019; 1 ♂, Shirui Hill (Site 3), 25.1171°N 94.4456°E, 2190 m, 13.III.2019; 1 ♂, Shirui Hill (Site 4), 25.1112°N 94.4534°E, 2425 m, 25.VII.2019, genitalia slide no. JSI-GP 338; leg. JS Irungbam, India, (NCZ, ZSI). Diagnosis. The Harpyia longipennis complex was revised by Morozov (2013), raising H. formosicola (from Taiwan) and H. yunnanensis (from China, Yunnan, Vietnam, and Thailand) to valid species. The male genitalia of our examined specimens are different from all other species of the H. longipennis group by having a prominent apical valva process. 8 th sternite bears a central projection on the posterior margin. Externally, H. nadiae is not distinguishable from H. longipennis. Distribution. India: Manipur (In the present study). Elsewhere: China, Vietnam (Morozov 2013).Published as part of Irungbam, Jatishwor Singh, Schintlmeister, Alexander & Fric, Zdenek Faltynek, 2022, New and less known Notodontidae from Manipur, India (Lepidoptera: Noctuoidea), pp. 61-93 in Zootaxa 5196 (1) on page 86, DOI: 10.11646/zootaxa.5196.1.3, http://zenodo.org/record/722413
Cerura xenia Morozov & Shovkoon 2023, species nov.
No full text<i>Cerura xenia</i> species nov. <p> <b>Holotype:</b> Ô, Kazakhstan, South Kazakhstan region, West Tian Shan, Ugam mts, Sazanata river N42°09’58,1” E70°24’14,2” leg. Shovkoon D.F. —in coll. Zoologische Staatsammlung München | two paratypes: Ô, the same data in coll. Laboratory of Animal Systematics and Faunistics Samara National Research University, Samara, Russia | Ô, the same data in coll Dr Morozov P.S., Moscow, Russia.</p> <p> <b>Diagnosis:</b> The males of <i>Cerura xenia</i> resemble <i>C. viidaleppi</i> externally but shape of the forewings of <i>C. xenia</i> is narrower, and the colour of the forewings is greyish. The dark grey, serrated fasciae and spots are well-marked. The apex of the anal margin of the whitish hindwings has blackish markings.</p> <p>The male genitalia is characterized by narrowed triangular valvae, small bilobed uncus and small rounded socii and rather small saccus. The aedeagus is long, slender and slightly curved, distally tapered. The 8th sternite with very short processes.</p> <p>The female is unknown so far.</p> <p> <i>Cerura viidaleppi</i> —the forewing color is slightly more fuscous, margin spots are weakly developed. Male genitalia displays broader triangular valvae, very large saccus, a long dagger-shaped aedeagus and prominently longer processes of 8th sternite. <i>Cerura przewalskii</i> shows a very variable forewing color of the forewings from white to grey and fuscous. The blackish pattern of the forewings can be well or weakly developed. The hindwingsc are usually white. The abdomen pattern consists of alternating white, gray and black fasciae. Male genitalia is characterized by massive uncus, broad valvae and the broader aedeagus with the dilated caudal part and the large apical spur. The 8-th sternite has the paired widely spaced arrow-like sclerotisations with short processes.</p> <p> <b>Biology.</b> Several specimens of <i>C. xenia</i> (3 ÔÔ) have been collected by light at 1845 m a.s.l. on the mountain slopes with steppe vegetation mixed with some trees (<i>Malus, Prunus, Populus, Juglans</i> and <i>Juniperus</i>) and bushes (<i>Rosa, Pistacia</i> and <i>Berberis</i>). It shares the habitat with <i>C. przewalskii</i>.</p> <p>The early stages are unknown. The larva probably feeds on Salicaceae as in congeners.</p> <p> <b>Distribution.</b> known only from the type locality: South kazakhstan, West tian-Shan, Ugam range.</p> <p> <b>etymology.</b> The new species is dedicated to Mrs Kseniya Proskuryakova, České Budějovice (Czech Republic),who made the excellent genitalia preparations for this work.</p>Published as part of <i>Morozov, Pavel & Shovkoon, Dmitry, 2023, A new species of Cerura SCHRANK, 1802 (Lepidoptera, Notodontidae) from Southern Kazakhstan, pp. 90-94 in Zootaxa 5230 (1)</i> on pages 90-93, DOI: 10.11646/zootaxa.5230.1.6, <a href="http://zenodo.org/record/7568902">http://zenodo.org/record/7568902</a>
A Gaussian approximation of the distributed computing process
No full textThe authors propose a refinement of the stochastic model describing the dynamics of the Desktop Grid (DG) project with many hosts and many workunits to be performed, originally proposed by Morozov et al. in 2017. The target performance measure is the mean duration of the runtime of the project. To this end, the authors derive an asymptotic expression for the amount of the accumulated work to be done by means of limit theorems for superposed on-off sources that lead to a Gaussian approximation. In more detail, depending on the distribution of active and idle periods, Brownian or fractional Brownian processes are obtained. The authors present the analytic results related to the hitting time of the considered processes (including the case in which the overall amount of work is only known in a probabilistic way), and highlight how the runtime tail distribution could be estimated by simulation. Taking advantage of the properties of Gaussian processes and the Conditional Monte-Carlo (CMC) approach, the authors present a theoretical framework for evaluating the runtime tail distribution
Extrusion without a motor:a new take on the loop extrusion model of genome organization
No full textChromatin loop extrusion is a popular model for the formation of CTCF loops and topological domains. Recent HiC data have revealed a strong bias in favour of a particular arrangement of the CTCF binding motifs that stabilize loops, and extrusion is the only model to date which can explain this. However, the model requires a motor to generate the loops, and although cohesin is a strong candidate for the extruding factor, a suitable motor protein (or a motor activity in cohesin itself) has yet to be found. Here we explore a new hypothesis: that there is no motor, and thermal motion within the nucleus drives extrusion. Using theoretical modelling and computer simulations we ask whether such diffusive extrusion could feasibly generate loops. Our simulations uncover an interesting ratchet effect (where an osmotic pressure promotes loop growth), and suggest, by comparison to recent in vitro and in vivo measurements, that diffusive extrusion can in principle generate loops of the size observed in the data. Extra View on : C. A. Brackley, J. Johnson, D. Michieletto, A. N. Morozov, M. Nicodemi, P. R. Cook, and D. Marenduzzo "Non-equilibrium chromosome looping via molecular slip-links", Physical Review Letters 119 138101 (2017).</p
Reply to “Comment on ‘Attenuation, source parameters and site effects in the Irpinia–Basilicata region (southern Apennines, Italy)’ by I.B. Morozov”
No full textWe thank Igor B. Morozov for his interest in our article and for his comment (Morozov 2011)
regarding the non-parametric attenuation curves for the Irpinia–Basilicata region obtained
by generalized spectral inversion (Cantore et al. 2011). Morozov's comment has its root in a
new model proposed by Morozov (2008, 2010) for the interpretation of seismic attenuation
data, where the author comes to the conclusion that the typically used geometrical
spreading terms are oversimplified and argues in favor of a new geometrical spreading ...Published91-934T. Fisica dei terremoti e scenari cosismiciJCR Journalrestricte
Sensitivity analysis and simulation of a multiserver queueing system with mixed service time distribution
No full textThe motivation of mixing distributions in communication/queueing systems modeling is that some input data (e.g., service time in queueing models) may follow several distinct distributions in a single input flow. In this paper, we study the sensitivity of performance measures on proximity of the service time distributions of a multiserver system model with two-component Pareto mixture distribution of service times. The theoretical results are illustrated by numerical simulation of the M/G/c systems while using the perfect sampling approach
Figure 4. M in New data on sponges from Svalbard Archipelago with a description of a new species of Halicnemia
No full textFigure 4. M. perspinosa, (a) habitus; (b) cross section through the inner part of the sponge; (c–f) SEM images of spicules; (c) acanthostyle; (d) tornote; (e) sigma, (e) chelae.Published as part of Morozov, Grigori, Sabirov, Rushan Mirzovich & Anisimova, Natalia, 2018, New data on sponges from Svalbard Archipelago with a description of a new species of Halicnemia, pp. 491-507 in Journal of Natural History (J. Nat. Hist.) 52 (7-8) on page 498, DOI: 10.1080/00222933.2018.1440020, http://zenodo.org/record/478029
Iophon koltuni Morozov & Sabirov & Zimina 2019, sp. nov
No full textIophon koltuni sp. nov (Figure 3 (a – d1)) Iophon piceus dubius Koltun 1959, p. 151 – 152, fig. 107; pl. XXVI, fig. 2 Iophon cf. nigricans: Dinn and Leys 2018, p. 33 Material examined The holotype was collected at the edge of the continental shelf at the central part of the Laptev Sea (76.76°N, 124.28°E), and deposited in the Edward Eversman Zoology Museum (identification number 2.2.8.443). The paratype was found in the east of the southern tip of Spitsbergen (75.82°N, 25.62°E). Description The examined fragment of sponge is massive and more or less leaf-shaped, with several poorly pronounced lobes, about 8 cm in width and 2 cm in height. Surface uneven, slightly scabrous, coarse-pored, covered with a thin dermal membrane. Disorderly scattered irregular openings (oscules) are often covered by a coarse sieve, or partly hidden by the edges of dermal membrane surrounding them. The dermal membrane (where undamaged) is pierced by numerous small roundish pores often lying in meshes. The consistence of the body is soft and compressible, but not strong in tension. Colour dark brown (in alcohol). Skeleton Main skeleton composed of a quite diffuse network of acanthostyles lying in bundles and disorderly scattered single spicules of the same category. Skeleton of dermal membrane consists of similar network of tylotes lying more or less tangentially. Spicules (Figure 3 (a – d1)) Acanthostyles straight or slightly curved, dimensions: 226.1 – 296.9 – 324.7 (n = 40) × 6.3 – 10.2 – 12.1 (n = 15) µm; tylotes with slightly spined ends, dimensions: 249.8 – 266 – 286.2 (n = 15) × 6.5 – 7.8 – 9.6 (n = 15) µm; palmate anisochelae, dimensions: 15.4 – 22.6 – 38.7 (n = 15) µm; bipocilla, dimensions: 10.4 – 12.85 – 16.9 (n = 30) µm. Etymology The species is named in honour of Vladimir M. Koltun (1921 – 2004) – an outstanding Russian zoologist and spongiologist. Distribution The Barents (south-east of Spitsbergen: 75.82°N, 25.62°E) and Laptev (st. O-18) seas, the Labrador Sea. Depth range: 92 – 141 m. Remarks Lundbeck (1905) in his monograph provided detailed descriptions of three representatives of the genus Iophon that inhabit the Nordic seas and adjacent Arctic: I. piceus, I. dubius and I. frigidus. Regarding the delimitation of these species, he suggested some differences mainly concerning style spination, the form of tylotes, and spicule dimensions in general, as well as the presence or absence of bipocilla. As Burton (1932) and later Koltun (1959, p. 140 – 150) noted, such minor differences may hardly be considered sufficient reason for species delimitation. Koltun examined 152 specimens of Iophon and proposed two subspecies for the Arctic seas. The first, Iophon piceus piceus, was identical to Iophon piceum (Vosmaer 1882). Iophon dubium (Hansen 1885) and I. frigidus (Lundbeck 1905) were united under the name Iophon piceus dubius. However, the variety of Iophon piceus dubius described by Koltun differed from both mentioned species. I. frigidus (Lundbeck 1905) is characterised by the absence of bipocilla in its skeletal composition, while in I. dubius (Hansen 1885) the bipocilla differed significantly in morphology (Figure 4). In the case of I. p. dubius the bipocilla have the identical, distinctly reduced alae, the length of which is half the size of the shaft of the spicule, and are provided with laterally arranged elongated teeth. The same distinctions from previously described Iophon species were mentioned for the specimens of I. cf. nigricans found in the Canadian Arctic by Curtis and Leys (2018). Thus, the validity of Iophon koltuni sp. nov. removed any doubts.Published as part of Morozov, Grigori, Sabirov, Rushan & Zimina, Olga, 2019, Sponge fauna of the New Siberian Shoal: biodiversity and some features of formation, pp. 2961-2992 in Journal of Natural History 52 (47) on pages 2961-2992, DOI: 10.1080/00222933.2018.1554166, http://zenodo.org/record/365416
Oxide electrocatalysts for the oxygen evolution reaction. Improvements of IrO2-based coatings
No full textIn consideration of the high cost of noble-metal-based electrode materials, the research of new compositions is mainly focused on the obtainment of long service-life anodes, at low noble-metal concentrations in the coating (e.g., 0.5÷1.0 g Ir m-2).
The result of our research has already led to the preparation of an IrO2-based anode (3 g Ir m-2), which has a service life of one year in dilute Na2SO4 solutions, under a current density of 2000 A m-2. The well known alternative would be IrO2-Ta2O5 coating, with a comparatively higher iridium content (10 g m-2).
The factors that allowed improved performance for our electrode may be schematized in the following points:
• Coating composition. The maximum stability has been reached with mixed-oxide coatings based on IrO2 and SnO2. Precursor solution compositions were devised, avoiding the problem of tin precursor volatilization.
• An original pre-treatment of the titanium support surfaces has been worked out, affording them the necessary chemical and electrochemical properties. Further advantages of the above solution are the environment-friendly and avoids acidic wastes.
• An optimal structure of stabilizing interlayer has been achieved, taking into consideration the anode wearing processes.
• Proposals and rules have been elaborated for the technology of electrode coatings stable under oxygen evolution.
Anodes prepared following the above know-how are in use in electrochemical devices for tap-water cleaning, sterilization of water in hospital environments and more generally in medical applications, chlorine-free sterilization of swimming pools.
Additionally, an interesting application is the preparation of electrodes for pacemaker devices, requiring besides bio-compatibility and durability, also a capacity of the order of 10 mF cm-2 at 100 Hz. Perspectives in cathodic protection and in industrial processes, where PbO2-based electrodes are traditionally used, must also be considered
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