1,382 research outputs found
Chrysolina (Hypericia) changbaishana Mikhailov 2024, sp. n.
No full text<i>Chrysolina</i> (<i>Hypericia</i>) <i>changbaishana</i> Mikhailov, sp. n. <p>https://zoobank.org/NomenclaturalActs/ E87DC5FA-8AC1-4F69-8BF8-2E20A6F24021</p> <p>Figs 6, 10</p> <p> TYPE MATERIAL. Holotype: ♂, with labels: <b>China</b>: Jilin Prov., / S of Erdaobaihe / Town 800 m, / 42,40º N, 128,106º E / 17.07.2012 / R. Dudko leg. [p] | HOLOTYPUS / <i>Chrysolina</i> (<i>Hypericia</i>) / <i>changbaishana</i> sp. n. / Yu. Mikhailov design. 2022 [p, r] (ISEA).</p> <p>DESCRIPTION. Male (holotype) (Fig. 6). Moderately convex, ovate. Body length – 6.2 mm, width – 4.0 mm. Dorsum shining, smooth, bicolor, elytra bronze, pronotum and head blackish violet; underside and legs black, with feeble greenish reflex. Antennae, maxillary palpi and tarsi dark brown.</p> <p>Head: frontoclypeus finely and sparsely punctured with smooth median stripe; frontal and epicranial sutures slightly deepened. Last maxillary palpomere axe-shaped, apically truncated, 1.2x longer then broad, 1.4 x longer and 1.2x wider than previous palpomere. Relative length of antennomeres 1–3 as ratios 7, 4, 6. Tenth antennomere 2x longer than broad, eleventh antennomere – 3.1x. Orbital lines short and narrow, far not reach antennal insertion. Antenna inserted 1.2x closer to eye than to clypeus.</p> <p>Thorax: pronotum transverse, twice broader than long, broadest behind middle; slightly rounded laterally, almost straight basally and apically; pronotal disc evenly convex, covered with dense fine punctures; width between anterior angles 1.5x less than basal width. Anterior angles moderately produced, rounded triangular; basal angles obtuse; anterior side margined and ciliate, widely incised in bracket-shape; basal edge arcuately convex. Lateral sides steeply swollen along entire length, lateral callus narrow, separated from disc by deep groove with vertical outer border in basal 2/5 and by broad almost obsolete impression with large punctures in anterior part. Prothoracic hypomera with longitudinal furrow, outer side slightly convex and smooth, basal 1/4 covered with coarse wrinkles; basal fold short and moderately deep; prosternal process narrow, slightly convex longitudinally; anterolateral portion of prosternum with convex bulge medially; prosternum 1.3x shorter than metasternum; metasternum of the same length as first ventrite, smooth.</p> <p>Elytra with weak humeral callus, each elytron 2.1 times longer than wide, elytral length 4.7 mm. Large primary punctures form scutellar row of 8 punctures and 9 regular paired rows. Punctures in rows sparsely placed. 5th puncture row consists of 24–26 punctures. Secondary punctures fine and sparse (same as on pronotum) on wider intervals and very fine on narrow intervals between paired rows. Marginal stria with large sparse impressed punctures. Sutural stria distinct at apical slope. Epipleura inclined outside, visible along entire length. Hind wings developed.</p> <p>Tarsi narrow, fore tarsi (tarsomeres 1–3) 2.6x as long as broad; ratio of width of fore tarsomeres 1–3 as 1.5, 1.3, 2.0. All tarsomeres with entire sole beneath.</p> <p>Abdomen: pygidium with impression in basal 2/3. Ventrite 1 broadly margined on anterior edge, covered with very sparse fine punctures, only anterior intercoxal process covered with medium-sized punctures. Last ventrite evenly convex, with slightly incised apex, smooth, covered with very sparse fine punctures. Aedeagus (Fig. 10).</p> <p> DIFFERENTIAL DIAGNOSIS. From <i>Ch. difficilis</i> (Fig. 7) also found in Jilin Province is readily distinguished by smaller size, narrow scutellum, longer and narrower distinctly rounded apical projection of aedeagus (Fig. 10) and narrow, very steeply swollen lateral calli of pronotum. In <i>Ch. difficilis</i> pronotal lateral calli are broader and flatter. Body size of the new species is closer to <i>Ch. nikkoensis</i>, presented below, which has different combination of dorsal punctation (larger elytral and smaller pronotal one) and broad apical projection of eadeagus (Figs 11, 12).</p> <p>ETYMOLOGY. The name is derived from the Changbai Mountains (Changbaishan), in the foothills of which the type locality is situated.</p> <p> REMARKS. In Japan two <i>Hypericia</i> species are known (Saitoh, 2012), namely <i>Ch. difficilis</i> and <i>Ch. nikkoensis</i> (Jacoby, 1885). The latter is described and known mainly from Honshu with only few records from Hokkaido (Hirano, 2003; Araki <i>et al</i>., 2013). No <i>Hypericia</i> species have been recorded from the Kurile Islands so far. But as a part of long term entomological survey in South Kurile Islands organized by Dr. Kirill Makarov (MPSU) in the year 2012 a series of relatively small beetles (Figs 13, 14) from the genus <i>Chrysolina</i> was collected by Dr. Yuri Sundukov in Shikotan Island. After careful examination these beetles proved to be <i>Ch. nikkoensis</i>.</p> <p> Although the place of housing of Jacoby’s collection is well known, the types of <i>Ch. nikkoensis</i> have not been controlled so far (Kimoto & Takizawa, 1994; Saitoh, 2012; Bienkowski, 2019). Thanks to Dr. Michael Geiser (NHMUK) I got the opportunity to study the types (Figs. 15, 16) and therefore can exactly prove the identity of the beetles from Shikotan. This is the first record not only for Kurile Islands but for the fauna of Russia as well.</p>Published as part of <i>Mikhailov, Yu. E., 2024, REVIEW OF LEAF BEETLES OF THE SUBGENUS HYPERICIA BEDEL, 1899 (COLEOPTERA: CHRYSOMELIDAE: CHRYSOLINA) FROM EAST ASIA, pp. 1-18 in Far Eastern Entomologist 499</i> on pages 9-10, DOI: 10.25221/fee.499.1, <a href="http://zenodo.org/record/10928368">http://zenodo.org/record/10928368</a>
СТАТИСТИЧЕСКОЕ РАССМОТРЕНИЕ АНСАМБЛЯ КВАНТОВЫХ ТОЧЕК INAS НА ПОВЕРХНОСТИ (001)GAAS STATISTICAL APPROACH TO THE STRAIN-DRIVEN FORMATION OF InAs QUANTUM DOTS ON GaAs(001)
No full texthttp://elibrary.ru/item.asp?id=18059795It is shown that the change of the growth mode from 2D to 3D in the formation of InAs quantum dots on (001) GaAs i.e. Stranski-Krastanov transition is actually a two-dimensional phase transition in the lattice-gas model. Three-parameter isotherms are used to describe the phase transition and the parameters of lateral interaction leading to the condensation of quantum dots are defined
Cryptocurrency market development: Hurst method
No full textThe aim of this work is to study the pricing in the cryptocurrency market and applying cryptocurrencies by the Bank of Russia for its monetary policy. The research objectives are to identify the cyclical nature of price dynamics, to study market maturity and potential risks that have a long-term positive relationship with the financial stability of the cryptocurrency market. The author uses the Hurst method with the Amihud illiquidity measure to study the resistance of four cryptocurrencies (Bitcoin, Litecoin, Ripple and Dash) and their evolution over the past five years. The study results in the author's conclusion that the cryptocurrency market has entered a new stage of development, which means a reduced possibility to have excess profits when investing in the most liquid cryptocurrencies in the future. However, buying new high-risk tools provides opportunities for speculative income. The author concludes that illiquid cryptocurrencies exhibit strong inverse anti-persistence in the form of a low Hurst exponent. A trend investing strategy may help obtain abnormal profits in the cryptocurrency market. The Bank of Russia could partially apply digital currency to implement monetary policy, which would soften the business cycle and control the inflation. If Russia accepts the law ''On Digital Financial Assets'' and legalizes cryptocurrencies after the economic crisis caused by the COVID-19 pandemic, the Bank of Russia might act as a lender of last resort and offer crypto loans. © Mikhailov A. Yu., 202
Application of local and non-local approaches to multiple fatigue crack initiation and propagation
No full textFatigue strength conditions presented in terms of normalized equivalent stress functionals defined on loading processes are used to unite the stages of material damage with fatigue crack initiation and multiple crack propagation under arbitrary loading history. Examples of employing the local form of the functionals associated with the Palmgren-Miner linear damage accumulation rule and the power-type S–N diagram to a periodic crack system are given and shortcomings of the local approach are pointed out. A non-local approach free from the shortcomings is described. Equations for curvilinear crack growth rate vectors taking into account the whole damage history ahead of the crack are presented for multiple cracks under mixed-mode loadin
Chrysolina (Hypericia) fricata Bechyne 1950
No full text<i>Chrysolina</i> (<i>Hypericia</i>) <i>fricata</i> Bechyně, 1950 <p>Figs 19, 20, 22</p> <p> <i>Chrysolina</i> (<i>Hypericia</i>) <i>fricata</i> Bechyně, 1950: 158 (China, prov. Fujian (Fokien), syntypes in NMPC, examined).</p> <p>TYPE MATERIAL. Syntype, ♂, with labels: FOKIEN [p] | Coll. Achard [h] | TYPUS [p, r] | Chrysolina TYPE / fricata n. sp. [h] / 1949 Det. J. Bechyně [p] (NMPC).</p>Published as part of <i>Mikhailov, Yu. E., 2024, REVIEW OF LEAF BEETLES OF THE SUBGENUS HYPERICIA BEDEL, 1899 (COLEOPTERA: CHRYSOMELIDAE: CHRYSOLINA) FROM EAST ASIA, pp. 1-18 in Far Eastern Entomologist 499</i> on page 15, DOI: 10.25221/fee.499.1, <a href="http://zenodo.org/record/10928368">http://zenodo.org/record/10928368</a>
Review of chrysolina immarginata species group from the subgenus chalcoidea (Coleoptera: Chrysomelidae) with description of a new species
Get PDFChrysolina immarginata species group is introduced and defined within the subgenus Chalcoidea. Chrysolina ivanovi Mikhailov sp.n. described from Eastern Kazakhstan demonstrates the northernmost limit for the distribution of this group. Chrysolina alaiensis (Lopatin, 1998) is resurrected from synonymy with Chrysolina dieckmanni (Mohr, 1966) and Chrysolina (Chalcoidea) luchti Lopatin, 2000 is resurrected from synonymy with Chrysolina zangana Chen et Wang, 1981 based on type examination. © 2022, KMK Scientific Press. All rights reserved
Local and non-local approaches to creep crack initiation and propagation
No full textA functional form of local brittle strength conditions for a time- or history-dependent materials is presented. The particular strength condition associated with the Robinson linear damage accumulation rule and the power-type durability diagram is employed to formulation and analysis of creep crack initiation and propagation problem. The problem is reduced to a non-linear integral Volterra equation, which can be transformed to a linear one for the case of a single crack. Analytical solutions of some simple problems for linear viscoelastic materials are presented for that case and shortcomings of the local approach are pointed out. A non-local approach free from the shortcomings is presented along with an example of its implementatio
Clubiona corticalis
No full textClubiona corticalis species-group Diagnosis. The Clubiona corticalis -group species can be recognized by a combination of the following genitalic characters (see also Deeleman-Reinhold 2001, Mikhailov 1995, Liu et al. 2016 and Yu et al. 2017b): male palp with ventral and retrolateral tibial apophyses simple, weakly developed, tegulum enlarged and protruded, conductor completely separated from tegulum; female with small copulatory openings located anteriorly on epigynal plate, posterior bursae enlarged.Published as part of Yu, Hao & Li, Shuqiang, 2019, Eight new species of the genus Clubiona Latreille, 1804 from Xishuangbanna Rainforest, southwestern China (Araneae, Clubionidae), pp. 151-178 in Zootaxa 4545 (2) on page 153, DOI: 10.11646/zootaxa.4545.2.1, http://zenodo.org/record/261874
Kirill Glebovich Mikhailov: On the occasion of his 60th Birthday (Foreword)
No full textTo prepare this issue on time for Kirill Mikhailov’s birthday, and considering that he created several journals himself and helped to create several more, we turned to the editors of those journals asking for their contribution. As a result, this unique Festschrift was put together with the participation of the editors of seven journals: Acarina (Andrei V. Tolstikov), Arthropoda Selecta (Seppo Koponen, Dmitri V. Logunov, Yuri M. Marusik, Sergei Zonstein), Caucasian Entomological Bulletin (Dmitri A. Dubovikoff), Euroasian Entomological Journal (Michael G. Sergeev), Invertebrate Zoology (Elena N. Temereva), Russian Entomological Journal (Georgy Yu. Lyubarsky), and Russian Journal of Theriology (Andrey A. Lissovsky). There is only one exception: Vladimir Blagoderov, who is a member of Zootaxa editorial board and friend of Kirill Mikhailov
Darboux transformation with dihedral reduction group
Get PDFWe construct the Darboux transformation with Dihedral reduction group for the 2-dimensional generalisation of the periodic Volterra lattice. The resulting Bäcklund transformation can be viewed as a nonevolutionary integrable differential difference equation. We also find its generalised symmetry and the Lax representation for this symmetry. Using formal diagonalisation of the Darboux matrix, we obtain local conservation laws of the system
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