3,597 research outputs found
Arguments to the norm in the discourses of V. V. Putin and D. A. Medvedev
No full textThe article presents arguments to the normin the discourse of V. V. Putin and D. A. Medvedev. Such argumentsappeal to the norm,custom,rule as the criterion of the correctness of judgments.The material for research is served by the official speeches made byRussian political leaders, and which cover the period from 2014 to 2016. The author gives the examples of examined arguments and analyzes norms, standards to which Russian politicians are referring. The article also stresses the functions of arguments to the normin the political texts of V. V. Putin and D. A. Medvedev. The paper shows that both Russian leaders appeal tointernational law, Russian legislation, public practice and economic rules as to the norms justifying the thesis. Therefore Putin and Medvedev build the image of politicians who pay attention to principles of public life. The main purpose of these arguments is to function as unarguable facts andpersuade voters to accept decisions discussed
Crosita clementzae subsp. atasica Medvedev 1976
No full textCrosita clementzae atasica Medvedev, 1976 References. Medvedev 1976: 908, 1982: 247; Medvedev and Voronova 1977a: 331; Kippenberg 2010: 420. Material Examined. Dzegijn-Ama 7.viii.1968, leg. Emelyanov (ABC); Atas-Ula, 17.ix.1976, leg. L. Medvedev and N. Voronova (LMC). Distribution. Mongolia (Gobi-Altai). Notes. An endemic species of Mongolia, described by Medvedev (1976) from the Atas-Ula Mountains.Published as part of Guskova, Elena V., 2017, The Chrysomelinae (Coleoptera: Chrysomelidae) of the Mongolian Altai, pp. 120-130 in The Coleopterists Bulletin 71 (1) on page 123, DOI: 10.1649/0010-065X-71.1.120, http://zenodo.org/record/483654
Ischnopsyllus (H.) ussuriensis Medvedev 1986
No full textIschnopsyllus (H.) ussuriensis Medvedev, 1986 Dwells in the Far East (Kamchatka, Kuril Islands, Primorsky Krai) (Medvedev, 1987; Medvedev et al., 1991), hosts are Siberian bat and Ikonnikov’s bat. It should be noted that, despite the considerable length, Siberia and the Far East complex is characterised by the uniformity of the ectoparasite fauna. The only exception — flea I. ussuriensis is found only in the Far East. Perhaps the species is more widespread, and the lack of finds in Western and Eastern Siberia is due to insufficient knowledge of the area.Published as part of Orlova, M. V. & Orlov, O. L., 2015, Attempt To Define The Complexes Of Bat Ectoparasites In The Boreal Palaearctic Region, pp. 75-86 in Vestnik Zoologii 49 (1) on page 81, DOI: 10.1515/vzoo-2015-0008, http://zenodo.org/record/645223
Mathematical modeling of endocrine regulation subject to circadian rhythm
No full textThe 2017 Nobel Prize in Physiology or Medicine awarded for discoveries of molecular mechanisms controlling the circadian rhythm has called attention to the challenging area of nonlinear dynamics that deals with synchronization and entrainment of oscillations. Biological circadian clocks keep time in living organisms, orchestrating hormonal cycles and other periodic rhythms. The periodic oscillations of circadian pacemakers are self-sustained; at the same time, they are entrainable by external periodic signals that adjust characteristics of autonomous oscillations. Whereas modeling of biological oscillators is a well-established research topic, mathematical analysis of entrainment, i.e. the nonlinear phenomena imposed by periodic exogenous signals, remains an open problem. Along with sustained periodic rhythms, periodically forced oscillators can exhibit various “irregular” behaviors, such as quasiperiodic or chaotic trajectories. This paper presents an overview of the mathematical models of circadian rhythm with respect to endocrine regulation, as well as biological background. Dynamics of the human endocrine system, comprising numerous glands and hormones operating under neural control, are highly complex. Therefore, only endocrine subsystems (or axes) supporting certain biological functions are usually studied. Low-order dynamical models that capture the essential characteristics and interactions between a few hormones can than be derived. Goodwin's oscillator often serves as such a model and is widely regarded as a prototypical biological oscillator. A comparative analysis of forced dynamics arising in two versions of Goodwin's oscillator is provided in the present paper: the classical continuous oscillator and a more recent impulsive one, capturing e.g. pulsatile secretion of hormones due to neural regulation. The main finding of this study is that, while the continuous oscillator is always forced to a periodic solution by a sufficiently large exogenous signal amplitude, the impulsive one commonly exhibits a quasiperiodic or chaotic behavior due to non-smooth dynamics in entrainment.Team Tamas Keviczk
Colposcelis (Turcmenicola) lopatini G. S. Medvedev 1970
No full text<i>Colposcelis</i> (<i>Turcmenicola</i>) <i>lopatini</i> G.S. Medvedev, 1970 <p>(Figs 7, 8)</p> <p> Medvedev 1970: 406 (<i>Colposcelis</i> (<i>Turcmenicola</i>)); Medvedev & Nepesova 1985: 66, fig. 28 (<i>Colposcelis</i>).</p> <p> <b>Type material.</b> Holotype, ♂ and paratypes, 1 ♂, 3 ♀♀: “V. Turkmenia Kelif G. Medvedev 19.IV.68.” (Cyrillic label, handwritten by G.S. Medvedev). Holotype and paratypes are also provided with labels “ Holotypus <i>Colposcelis lopatini</i> G. Medv. ” and “ Paratypus <i>Colposcelis lopatini</i> G. Medv. ” respectively.</p> <p> <b>Distribution.</b> The species is known only from the south of Kugitang Mts. in Turkmenistan.</p>Published as part of <i>Bekchanov, Norbek Kh., Nabozhenko, Maxim V. & Bekchanova, Mokhira Kh., 2023, Review of the subgenus Turcmenicola Bogatchev, 1952, the genus Colposcelis Dejean, 1834 (Coleoptera: Tenebrionidae: Tentyriini), pp. 550-564 in Zootaxa 5375 (4)</i> on page 557, DOI: 10.11646/zootaxa.5375.4.6, <a href="http://zenodo.org/record/10203164">http://zenodo.org/record/10203164</a>
Stability Properties of the Impulsive Goodwin’s Oscillator in 1-cycle
No full textThe Impulsive Goodwin’s Oscillator (IGO) is
a mathematical model that represents a hybrid closed-loop
system. It arises by closing a specific of type continuous
positive linear time-invariant system with impulsive feedback,
incorporating both amplitude and frequency pulse modulation.
The structure of the IGO precludes the existence of equilibria
and thus ensures that all of its solutions, whether periodic
or non-periodic, are oscillatory. Originating in mathematical
biology, the IGO also constitutes a control paradigm applicable
to a wide range of fields, particularly to closed-loop dosing
of chemicals and medicines. The pulse modulated feedback
introduces strong nonlinearity and non-smoothness into the
closed-loop dynamics thus rendering conventional controller
design methods not applicable. However, the hybrid dynamics
of IGO reduce to a nonlinear discrete-time system, exhibiting
a one-to-one correspondence between solutions of the original
hybrid IGO and those of the discrete-time system. The paper
proposes a design approach that leverages the linearization of
the equivalent discrete-time dynamics in the vicinity of a fixed
point. An efficient local stability condition of the 1-cycle in terms
of the characteristics of the amplitude and frequency modula-
tion functions is obtained. Unlike the conventional Schur-Cohn
and Jury stability conditions applied to the Jacobian matrix,
the obtained criterion requires checking a single inequality that
is linear in the slopes of the modulation characteristics
Geometry of third order ODE systems
No full textWe compute cohomology spaces of Lie algebras that describe
differential invariants of third order ordinary differential equations. We prove
that the algebra of all differential invariants is generated by 2 tensorial
invariants of order 2, one invariant of order 3 and one invariant of order 4.
The main computational tool is a Serre-Hochschild spectral sequence and
the representation theory of semisimple Lie algebras. We compute differential
invariants up to degree 2 as application
Gonioctena (Gonioctena) ogloblini Medvedev & Dubeshko 1972
No full textGonioctena (Gonioctena) ogloblini Medvedev & Dubeshko, 1972 (Figs 23–24) Gonioctena ogloblini Medvedev & Dubeshko, 1972: 80 (type locality: Russia, Baikal); Dubeshko & Medvedev 1989: 134. Gonioctena (Gonioctena) ogloblini: Medvedev 1982: 89, 252; Medvedev 1992: 574; Medvedev & Dubeshko 1992: 117; Lopatin et al. 2004: 123; Kippenberg 2010: 434; Warchałowski 2010: 555; Yang et al. 2014: 366. Gonioctena suwai Takizawa, 1985: 7 (type locality: Korea, Kyeongsangnamdo); Gruev 1994: 78. syn. nov. Gonioctena (Gonioctena) suwai: Lee & An 2001: 103; Cho & Lee 2008: 109; Kippenberg 2010: 434; Warchałowski 2010: 555. Types. Gonioctena ogloblini: Holotype female (LMCM), Baikal, Malye Koty, on Alnus, 28.VII. 1967 // Holotypus Gonioctena ogloblini L. Medvedev // Gonioctena ogloblini L. Medv. det. L. Medvedev. Paratypes: 1 female (LMCM), environs of Khika lake, N. Mongolia, VI. 1926 // Allotypus Gonioctena ogloblini L. Medvedev; 1 female (LMCM), Baikal, Malye Koty, on Alnus, 22.VII. 1967, Dubeshko leg. // Paratypus; 1 male (LMCM), Baikal, Malye Koty, on Alnus, 28.VII. 1967, Dubeshko leg. // Paratypus. Additional material. 1 female (HCCA), Korea, Chungbuk prov., Danyang-gun, Mt. Sobaek-san, 25.V. 1996, S.N. Kwak; 1 males (HCCA), Korea, Gangwon prov., Taebaek-si, Mt. Taebaek-san, 6.VI. 1997, M.K. Choi; 1 male and 3 females (HCCA), Korea, Gangwon prov., Taebaek-si, Mt. Hambaek-san, 21.V. 2006, H.W. Cho; 1 female (HCCA), Korea, Gangwon prov., Pyeongchang-gun, Mt. Gyebang-san, 31.V. 2006, H.W. Cho; 1 female (HCCA), Korea, Gangwon prov., Pyeongchang-gun, Mt. Odae-san, 7.VI. 2009, H.W. Cho; 1 male (HCCA), Korea, Junbuk prov., Muju-gun, Mt. Deokyu-san, 25.V. 1993, H.J. Kang; 1 male (HCCA), Korea, Junnam prov., Sancheong-gun, Mt. Jiri-san, 29.V. 1991, M.S. Shon. Distribution. Russia (Irkutsk, Khabarovsk and Primorsky Krai), Mongolia, China (Heilongjiang), North Korea, South Korea. Note. We unsuccessfully tried to find type specimens of Gonioctena suwai Takizawa, 1985, however the figure of aedeagus is clearly identical to that of G. ogloblini Medvedev & Dubeshko, 1972. Moreover, the examined type specimens of Gonioctena ogloblini are conspecific with numerous additional specimens collected in South Korea and attributed to G. suwai. We conclude that Gonioctena suwai should be synonymized with G. ogloblini.Published as part of Cho, Hee-Wook & Borowiec, Lech, 2016, On the genus Gonioctena Chevrolat (Coleoptera: Chrysomelidae: Chrysomelinae), with descriptions of seven new species from the Oriental region and Palaearctic China, pp. 168-184 in Zootaxa 4067 (2) on page 182, DOI: 10.11646/zootaxa.4067.2.3, http://zenodo.org/record/26237
Neue Cassidinen aus China (Coleoptera: Chrysomelidae).
No full textIn der vorliegenden Arbeit werden die Ergebnisse der Bearbeitung chinesischer Cassidinen aus der Sammlung des Verfassers mitgeteilt. Es werden drei neue Arten und zwei neue Unterarten beschrieben, ferner werden zwei für China noch nicht bekannte Arten angeführt und das Areal einiger Formen präzisiert. Die Typen und Paratypen der neu beschriebenen Arten, bzw. Unterarten, befinden sich in der Sammlung des Zoologischen Institutes der Akademie der Wissenschaften der SU und in der Sammlung des Autors.Nomenklatorische Handlungengresitti [sic!] Medvedev, 1957 (Basiprionota), spec. n.mongolensis Medvedev, 1957 (Cassida prasina), sspec. n.hincksi Medvedev, 1957 (Cassioa Mionycha), spec. n.gansuica Medvedev, 1957 (Glyphocassis spilota), sspec. n.pygmaea Medvedev, 1957 (Thlaspida), spec. n.The results of the treatment of Chinese Cassidinae from the author\u27s collection are discussed. There are described 3 new species, 2 new subspecies, and mentioned species new to China. Types and Paratypes in the collection of the Zool. Inst. Acad. Sei. USSR and in the author\u27s collection.Nomenclatural Actsgresitti [sic!] Medvedev, 1957 (Basiprionota), spec. n.mongolensis Medvedev, 1957 (Cassida prasina), sspec. n.hincksi Medvedev, 1957 (Cassioa Mionycha), spec. n.gansuica Medvedev, 1957 (Glyphocassis spilota), sspec. n.pygmaea Medvedev, 1957 (Thlaspida), spec. n
FIGURE 1 in Rediscovery of Gryllomorpha miramae Medvedev, 1933 (Orthoptera: Gryllidae: Gryllomorphinae) in Ukraine
No full textFIGURE 1. Newly recorded habitats of Gryllomorpha miramae Medvedev, 1933 within Steppe zone of Ukraine: A.—steppe area in vicinity of Yur'ivka village (Ukraine, Zaporizhzhia Region, June 29, 2019); B.—damaged steppe area in vicinity of Strohanivka village (Ukraine, Kherson Region, September 7, 2021).Published as part of Martynov, Alexander V., 2023, Rediscovery of Gryllomorpha miramae Medvedev, 1933 (Orthoptera: Gryllidae: Gryllomorphinae) in Ukraine, pp. 541-546 in Zootaxa 5263 (4) on page 542, DOI: 10.11646/zootaxa.5263.4.5, http://zenodo.org/record/783593
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