214 research outputs found
Новый вид рода Scoparia Haworth, 1811 (Lepidoptera: Pyraloidea, Crambidae) из Закавказья
Scoparia sinevi Streltzov, sp. n. is described from the Republic of Southern Ossetia. The new species is very similar in its appearance to the Central Asian S. juldusella (Caradja, 1916) but distinctly differs from latter by the male genitalia with cornutus consisting of three large spines (cornutrus with one large spine in S. juldusella). The moths of the new species were collected from forb subalpine meadows in the Rachinsky Range
Lepidoptera (Insecta) of proposed specially protected natural area "Belokurikha nature park" (Northern Altai). First results
149 Lepidoptera species from 16 families were reported for the territory of the proposed protected area "Belokurikha Natural Park". This list is the primary data on the fauna of Lepidoptera in the region. Most of the species belongs to Euro-Siberian and Transpalaearctic groups
Spin polarized electric currents in semiconductor heterostructures induced by microwave radiation
We report on microwave (mw) radiation induced electric currents in
(Cd,Mn)Te/(Cd,Mg)Te and InAs/(In,Ga)As quantum wells subjected to an external
in-plane magnetic field. The current generation is attributed to the
spin-dependent energy relaxation of electrons heated by mw radiation. The
relaxation produces equal and oppositely directed electron flows in the spin-up
and spin-down subbands yielding a pure spin current. The Zeeman splitting of
the subbands in the magnetic field leads to the conversion of the spin flow
into a spin-polarized electric current.Comment: 3 pages, 4 figure
Materials on the Lepidoptera fauna of the Dagestan Republic (Northeastern Caucasus, Russia): autumn aspect (Insecta: Lepidoptera)
The article provides the list of Lepidoptera (the families: Cossidae, Coleophoridae, Choreutidae, Ethmiidae, Pterophoridae, Pyralidae, Crambidae, Lemoniidae, Lasiocampidae, Drepanidae, Geometridae, Sphingidae, Erebidae, Noctuidae, Lycaenidae, Nymphalidae, Pieridae), collected in four localities in the Republic of Dagestan in September 2020. In total, 207 species have been recorded. Five species are reported for the fauna of Russia for the first time: Casignetella texanella (Chambers, 1878) (Coleophoridae), Agriphila cyrenaicellus (Ragonot, 1887), Thyridiphora furia (Swinhoe, 1884), Haritalodes derogata (Fabricius, 1775) (Crambidae), and Scopula minorata (Boisduval, 1833) (Geometridae); 23 species - for the fauna of Eastern Caucasus: Perygra glaucicolella (Wood, 1892), Ecebalia halophilella (Zimmermann, 1926), E. linosyris (E. Hering, 1937), Ionescumia clypeiferella (O. Hofmann, 1871), Carpochena trientella (Christpoh, 1872) (Coleophoridae), Tebenna micalis (Mann, 1857) (Choreutidae), Ethmia candidella (Alpheraky, 1908) (Ethmiidae), Stenoptilia zophodactyla (Duponchel, 1838), Stenoptilodes taprobanes (Felder & Rogenhofer, 1875), Crombrugghia laetus (Zeller, 1847) (Pterophoridae), Glyptoteles leucacrinella Zeller, 1848, Cadra calidella (Guenée, 1845), (Pyralidae), Agriphila selasella (Hübner, 1813), Agriphila tolli (Bleszynski, 1952), Agriphila poliellus (Treitschke, 1832), Pediasia contaminella (Hübner, 1796), Pediasia fascelinella (Hübner, [1813]), Uresiphita gilvata (Fabricius, 1794), Antigastra catalaunalis (Duponchel, 1833) (Crambidae), Watsonalla binaria (Hufnagel, 1767) (Drepanidae), Idaea degeneraria erschoffi (Christoph, 1872), Scopula nigropunctata (Hufnagel, 1767), and Rhodometra sacraria (Linnaeus, 1767) (Geometridae)
Magnetooptical Study of Zeeman Effect in Mn modulation-doped InAs/InGaAs/InAlAs Quantum Well Structures
We report on a magneto-photoluminescence (PL) study of Mn modulation-doped
InAs/InGaAs/InAlAs quantum wells. Two PL lines corresponding to the radiative
recombination of photoelectrons with free and bound-on-Mn holes have been
observed. In the presence of a magnetic field applied in the Faraday geometry
both lines split into two circularly polarized components. While temperature
and magnetic field dependences of the splitting are well described by the
Brillouin function, providing an evidence for exchange interaction with spin
polarized manganese ions, the value of the splitting exceeds the expected value
of the giant Zeeman splitting by two orders of magnitude for a given Mn
density. Possible reasons of this striking observation are discussed
On the Possibility of the Detection of Extinct Radio Pulsars
We explore the possibilities for detecting pulsars that have ceased to
radiate in the radio band. We consider two models: the model with hindered
particle escape from the pulsar surface (first suggested by Ruderman and
Sutherland 1975) and the model with free particle escape (Arons 1981; Mestel
1999). In the model with hindered particle escape, the number of particles that
leave the pulsar magnetosphere is small and their radiation cannot be detected
with currently available instruments. At the same time, for the free particle
escape model, both the number of particles and the radiation intensity are high
enough for such pulsars to be detectable with the presently available receivers
such as GLAST and AGILE spacecrafts. It is also possible that extinct radio
pulsars can be among the unidentified EGRET sources.Comment: 5 pages, 1 figure corrected version of the paper that was published
in Astronomy Letter
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