13,292 research outputs found
Supernova explosions of runaway stars and young neutron stars above the Galactic plane
No full textContext. Several supernova remnants and young neutron stars were recently discovered relatively high above the Galactic plane. Understanding their origin will provide key insights into the properties of the Galactic halo. One possibility is that they originated from runaway OB stars born in the Galactic disk.Aims. We aim to determine the spatial distribution of supernova explosions from runaway OB stars and to assess whether this model can explain certain observed neutron stars.Methods. We mapped the distribution of supernova events produced by runaway OB stars by incorporating their birth rate, initial spatial distribution, lifetime, ejection mechanisms, and velocity distributions. By tracking their motion in the Galactic potential, we determined their final distribution right before the explosion.Results. We show that the neutron star Calvera, which is found at z approximate to 2.2 kpc, could have originated from a runaway OB star. In addition, we compared the probabilities of finding a supernova remnant originating from Type Ia and core-collapse supernovae high above the Galactic plane, finding that supernova remnants related to core-collapse supernovae outnumber those related to Type Ia supernovae
Volvariella orientalis E. F. Malysheva, E. S. Popov & A. V. Alexandrova 2022, sp. nov.
No full textVolvariella orientalis E.F. Malysheva, E.S. Popov & A.V. Alexandrova, sp. nov. (Fig. 2) MycoBank MB 841914 Diagnosis: —Basidiocarps large and stout, pileus pilose-squamulose, pale brownish grey or ochre brown, volva spacious, saccate, ochre brown or with olive tint, with velvety outer surface; basidiospores 7.5–8.5(9.3) × 5.0–6.0(6.4) µm, broadly ellipsoid to ovoid, cheilocystidia lageniform or fusiform, with apical papilla (mucronate), caulocystidia numerous; grow on rotten wood or litter. Type: — VIETNAM. Nghe An Province, Con Cuong District, Chau Khe commune, 2.5 km WNW of Khe Choang ranger station, Pu Mat National Park, 18°57’48.204’’N, 104°39’43.524’’E, h = 457 m. a.s.l., disturbed lowland tropical broadleaved monsoon forest, on strongly rotten banana debris, 18 April 2018, E. Popov (LE 313654!; GenBank: OL415619 – nrITS, OL415617 – nrLSU, OM 948984 – tef1). Etymology: —The name refers to geographical distribution. Basidiocarps large, fleshy. Pileus 60–110 mm diam., initially broadly campanulate, then convex to applanate with broad umbo, with even incurved non-striate margin; non-hygrophanous; surface dry, pilose-squamulose, covered with silk grey (RAL 7044), pebble grey (RAL 7032) or ivory (RAL 1014) squamules, scarce at margin and more dense and dark-coloured (ochre yellow - RAL 1024, olive brown – RAL 8008) at centre, with silver-white or yellowish background. Lamellae rather crowded, free, with lamellulae, ventricose, pinkish, spotted, with whitish undulating edge. Stipe 40–65 × 7–10 mm, cylindrical, broadening towards base (up to 20 mm), solid, grey white (RAL 9002) or oyster white (RAL 1013); longitudinally fibrillose. Volva spacious, saccate, bilobed, rather thick, ochre brown (RAL 8001) or olive brown (RAL 8008), with velvety surface. Context white. Smell and taste indistinct. Basidiospores [60, 1, 1] 7.5–8.5(9.3) × 5.0–6.0(6.4) µm (L av = 8.3 µm, W av = 5.7 µm, Q = (1.3)1.4–1.6(1.7), Q av = 1.5), ellipsoid to broadly ellipsoid or ovoid, hyaline in KOH, thick-walled. Basidia 24–30(40) × 7–10 µm, 4- spored, broadly clavate, often inflated in the middle. Cheilocystidia (40)57–93(110) × 13.5–20(40) µm, numerous, forming a sterile lamella edge, ventricose-fusiform, broadly lageniform, often with apical papilla (mucronate), thin- or slightly thick-walled, hyaline in 3% KOH, often with granular content. Pleurocystidia 40–80(98) × 13–20(28) µm, rather abundant, ventricose-fusiform or lageniform with obtuse or subcapitate apex, slightly thick-walled, hyaline in 3% KOH. Lamella trama composed of hyaline hyphae 3–7 µm wide, thin-walled. Pileipellis a cutis, transforming into a trichoderm, made up of thin- or slightly thick-walled, non-gelatinous hyphae, 15–20(30) µm wide, hyaline or yellowish; ascending terminal elements are cylindrical or fusiform with acuminate or mucronate apex, 70–200(290) µm long. Stipitipellis a cutis, compose of long, cylindrical, hyaline hyphae, 8–10 µm wide. Caulocystidia rather numerous, 30–84(92) × (5.5)7.0–18 µm, in bundles, cylindrical, fusiform or lageniform, hyaline, thin-walled. Clamp connections absent in all tissues examined. Habitat and known distribution: —Solitary, on banana litter in woody area. So far known only from two provinces of Vietnam located in central and southern parts of the country. Additional specimen examined: — VIETNAM. Central Highlands region (Tây Nguyên), Kon Tum Plateau, Gia Lai Province, Mang Yang districts, A Yun commune, A Yun village, Kon Ka Kinh National Park, 45 km northeast of the city Pleiku, 35 km east of the city Kon Tum, bank of the stream, 14°12’14.6376’’N, 108°17’51.2088’’E, banana grove, on banana litter, 21 May 2016, A. Alexandrova (LE 313241!, GenBank: MK 882999 – nrITS, MK 883004 – nrLSU, MK 940803 – tef1). Notes: —During the expedition to Vietnam in 2016, one specimen of a presumably unknown species was collected. Thorough morphological and molecular study has shown its uniqueness and independent taxonomic status (Malysheva et al. 2019). However, this specimen was immature, and then we could not study in detail the features of basidiospores. Another collection, found by one of the co-authors (E. Popov) in Nghe An province of Vietnam in 2019, turned out to be identical to the previous one. This made it possible to clarify the lacking morphological characteristics. Here we describe a new species, providing an amended and combined description based on the two studied collections. The macroscopic characteristics of our collections mostly agree with the description of Volvariella bombycina in terms of stout basidiocarps with light-coloured pale brownish and entirely squamulose pileus, thick stipe, and spacious brown volva. At the same time, the microscopic characters, such as the size of basidiospores and the peculiar form of cheilocystidia with the apical papilla, make it close to V. volvacea. Volvariella orientalis differs from V. bombycina in velvety outer surface of volva and broader hymenial cystidia with subcapitate apex, and it mainly differs from V. volvacea in pilose-squamulose pileus, ochre brown or olive brown volva and the presence of caulocystidia (Boekhout 1990). Moreover, the phylogenetic analyses of the combined nrITS and nrLSU sequences demonstrate the independent position of these three species on the tree (Fig. 1). The macromorphology of V. orientalis makes it also close to V. diplasia (Berk. & Broome 1871: 151) Singer (1949: 401), edible mushroom species currently cultivated in both tropical and subtropical regions. The main differences between the two species are colour of the volva, shape and size of basidiospores and cheilocystidia. The volva of V. diplasia is more light coloured, while V. orientalis has dark brown volva with distinct olive tint; the spores of V. diplasia are more elongate, often subcylindrical and frequently 10 µm or longer, and cheilocystidia are piriform or clavate and significantly smaller (33–50 × 18–26 µm) (Pegler 1987) than ones in V. orientalis.Published as part of Malysheva, Ekaterina & Popov, Eugene, 2022, Observations on Pluteaceae in Vietnam. 3. One new species of Volvariella, pp. 278-286 in Phytotaxa 545 (3) on pages 282-284, DOI: 10.11646/phytotaxa.545.3.3, http://zenodo.org/record/654145
A Carneades reconstruction of Popov v Hayashi
No full textS.37-56Carneades is an open source argument mapping application and a programming library for building argumentation support tools. In this paper, Carneades' support for argument reconstruction, evaluation and visualization is illustrated by modeling most of the factual and legal arguments in Popov v Hayashi.20Nr.
European policies for social inclusion of Roma : Catch 22?
Get PDFThe article analyzes contemporary political discourses with regard to social inclusion of Roma on the basis of comparison with achievements and failures in the previous historical period of the communist rule in Eastern Europe. It argues that since the vast majority of the European Roma had lived in the past and continue living nowadays in the countries of Eastern Europe, no successful policy for their inclusion is possible without taking into account the experiences and outcomes of the actions for Roma integration in the socialist period. The experience from the times of socialism shows that successful policies are possible only in an appropriate socio-political context and only if accomplished within the mainstream approach. Against this background, the article scrutinizes the European Policies for Social Inclusion of Roma, and explains why they present a Catch 22 situation: There is a vicious cycle of problems which need to be solved; the solution requires a special policy for inclusion, however this policy stigmatizes Roma and sets them even more apart from the rest of society. Thus the vicious cycle of problems expands. The main point of the article is to propose an explanation of this failure of democracy and liberalism, which could constitute a useful lesson for the future.Peer reviewe
Figs 47–52 in New Records Of Hoverflies (Diptera, Syrphidae) From Ukraine. V
No full textFigs 47–52. Epistrophe cryptica female: 47 — habitus, dorsal view; 48 — apex of the hind femur, lateral view (arrow shows black macrotrichia); 49 — hind tibia, lateral view; 50 — head, lateral view; 51 — head, anterolateral view; 52 — head, frontal view.Published as part of Prokhorov, A. V., Popov, G. V., Shparyk, V. Yu. & Vasilyeva, Yu. S., 2020, New Records Of Hoverflies (Diptera, Syrphidae) From Ukraine. V, pp. 237-258 in Zoodiversity 54 (3) on page 251, DOI: 10.15407/zoo2020.03.237, http://zenodo.org/record/645552
Figs 36–41 in New Records Of Hoverflies (Diptera, Syrphidae) From Ukraine. V
No full textFigs 36–41. Pelecocera (Chamaesyrphus) scaevoides: 36 — male habitus, dorsal view; 37 — male habitus, lateral view; 38 — male head and thorax, lateral view; 39 — male head, anterolateral view; 40 — male head, frontal view; 41 — female head, frontal view.Published as part of Prokhorov, A. V., Popov, G. V., Shparyk, V. Yu. & Vasilyeva, Yu. S., 2020, New Records Of Hoverflies (Diptera, Syrphidae) From Ukraine. V, pp. 237-258 in Zoodiversity 54 (3) on page 248, DOI: 10.15407/zoo2020.03.237, http://zenodo.org/record/645552
Figs 42–46 in New Records Of Hoverflies (Diptera, Syrphidae) From Ukraine. V
No full textFigs 42–46. Dasysyrphus pauxillus male: 42 — habitus, dorsal view; 43 — habitus, lateral view; 44 — abdomen, ventral view; 45 — head, anterolateral view; 46 — head, frontal view.Published as part of Prokhorov, A. V., Popov, G. V., Shparyk, V. Yu. & Vasilyeva, Yu. S., 2020, New Records Of Hoverflies (Diptera, Syrphidae) From Ukraine. V, pp. 237-258 in Zoodiversity 54 (3) on page 249, DOI: 10.15407/zoo2020.03.237, http://zenodo.org/record/645552
Figs 59–63 in New Records Of Hoverflies (Diptera, Syrphidae) From Ukraine. V
No full textFigs 59–63. Melangyna quadrimaculata female: 59 — habitus, dorsal view; 60 — habitus, lateral view; 61 — head, dorsal view; 62 — head, anterolateral view; 63 — head, frontal view.Published as part of Prokhorov, A. V., Popov, G. V., Shparyk, V. Yu. & Vasilyeva, Yu. S., 2020, New Records Of Hoverflies (Diptera, Syrphidae) From Ukraine. V, pp. 237-258 in Zoodiversity 54 (3) on page 253, DOI: 10.15407/zoo2020.03.237, http://zenodo.org/record/645552
Telecommunication theory : Textbook. Part 2
Get PDFIvaschenko P. V. Telecommunication theory : textbook. part 2 / P. V. Ivaschenko, D. M. Rozenvasser. – Odesa : O. S. Popov ONAT. – 2017. – 110 p.The Telecommunication Theory textbook consists of two parts:
part 1 – «Communication Signals» and «Theory of Noise Immunity of Tele-
communication Signals Reception»;
part 2 – «Transmission of Information in Telecommunication Systems» and
«Bases of the Error-control Codes Theory».
This textbook (part 2) contains main theoretical positions, questions for check-
ing the knowledge and English-Russian and Russian-English dictionaries of terms.
The textbook is intended for students majoring in 172 – Telecommunications
and radio technology studying the Telecommunication Theory
Education manual on telecommunication theory and theory of information and coding : Laboratory Works
Get PDFIvaschenko P. V. Education manual on telecommunication theory and theory of infor- mation and coding : Laboratory Works / P. V. Ivaschenko, D. M. Rozenvasser. – Odesa : O. S. Popov ONAT. – 2018. – 41 p.The education manual is intended for students majoring in:
172 – Telecommunications and radio technology studying Telecommunication
theory;
121 – Software engineering studying Theory of information and coding.
The education manual contains methodical guidelines for fulfilling 17 laborato-
ry works.
The methodical guideline for fulfilling each laboratory work contains objec-
tives, main postulates, questions for checking the knowledge, instructions for home-
and Laboratory works and guidelines for conclusions
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