The Structure and Mechanical Properties of Low Carbon Steel after Controlled Rolling and Low-Temperature Treatment

The structure and mechanical properties complex of X80 pipe grade steel after controlled rolling and low-temperature treatment were studied. The microstructure of X80 pipe steel has been studied, the size of the structural components has been determined. The mechanical properties of steel for samples cut perpendicular and parallel to the direction of the rolling axis are determined. Serial curves of impact toughness were constructed and the fracture surfaces of the samples of the steel under investigation were researched.     Keywords: ferrite, controlled rolling, accelerated cooling, bainite, macrostructural analysis, impact toughness, low-temperature annealin

New data on the taxonomy and fauna of Palaearctic species of the genus Thrypticus (Diptera: Dolichopodidae)

A new species, Thrypticus mongoliensis Negrobov, Selivanova et Maslova, sp. n. is described from Mongolia. According to the Palaearctic table of Negrobov, Stackelberg, published in 1971, the new species is close to the Thrypticus atomus Frey, differing in the form and chetotaxy of surstyli. Thrypticus atomus has straight surstyli, with 6 bristles and hairs at apex, while the new species has curved surstyli, more than 40 setae and hairs. On the morphology of the hypopygium, the new species is close to Thrypticus smaragdinus Gerstaecker, 1864, differing in the structure and chetotaxy of the surstyli, including curved and broadened at the base of the surstyli. Three species are listed for the fauna of Mongolia for the first time: Thrypticus intercedens Negrobov, 1967, Thrypticus emiliae Negrobov, 1971 in Negrobov et Stackelberg, 1971 and Thrypticus politus Negrobov, 1967. Thrypticus cuneatus (Becker, 1917) is recorded for the central part of the European part of Russia for the first time. Thrypticus bellus Loew, 1869 are indicated for the faunas of Karelia, Rostov and Lipetsk regions, Kyrgyzstan, Tajikistan and Uzbekistan for the first time. Thrypticus virescens Negrobov 1967 and Thrypticus laetus Verrall, 1912 are new records for Ryazan Regio

A New Species of the Genus Rhaphium (Dolichopodidae, Diptera) from Siberia

Rhaphium sibiricus Negrobov, Barkalov et Selivanova, sp. n. is described from the Altai Mountains. The new species is similar to Rhaphium gruniniani Negrobov, 1979, differing by black legs, simple, not thickened tip of fore basitarsus, length ratio of apical portion of vein CuA1 to crossvein dm-cu and by the shape of gonopodes.С высокогорного Алтая описан Rhaphium sibiricus Negrobov, Barkalov et Selivanova, sp. n. Новый вид близок к Rhaphium gruniniani Negrobov, 1979, от которого отличается черными ногами, простыми неутолщенными вершинами передних базитарзусов, соотношением длины вершинной части CuA1 к длине dm-cu и формой гонопод

A new species of the genus Achalcus Low, 1857 (Diptera: Dolichopodidae) from Far East region of Russia

Achalcus polleti Negrobov et Selivanova, sp. n. is described from Amur region, Russi

New species Sciapus Zeller, 1842 (Diptera: Dolichopodidae) from Armenia

The new species Sciapus medvedevi Negrobov et Selivanova, sp. n. is described from Armeni

The review of species of group Dolichopus salictorum Loew, 1871 (Dolichopodidae: Diptera)

Two new species Dolichopus zakhvatkini sp. n. from Azerbaijan and Dolichopus naglisi sp. n. from Tajikistan are described. The type specimens Dolichopus salictorum Loew, 1871 is redescribed, including a study of morphology of the hypopygium. Dolichopus salictorum for Ukraine, Dolichopus violovitshi for Sakhalin are recorded for the first time. A key to group of species of Dolichopus salictorum is made

New species of the Dolichopus Latreille, 1809 (Diptera: Dolichopodidae) from Magadan region of Russia

A description of a new species Dolichopus terminasianae Negrobov, Selivanova, Maslova, sp. n. from Magadan region of Russia, close to Dolichopus fraterculus Zetterstedt, 1843 is given

New data on the taxonomy of the group Dolichopus lonchophorus Loew, 1873 (Dolichopodidae: Diptera)

Two new species for science Dolichopus zurikovi sp. n. from Georgia and Dolichopus nartshukae sp. n. from Mongolia are described. An redescription of species Dolichopus turkestani Becker, 1917 with the release of neotype and the study of the morphology of the hypopygium. This species of first notes for Kyrgyzstan and Mongoli

New species of Hercostomus Loew, 1857 (Diptera: Dolichopodidae) from Tajikistan

Hercostomus vodjanovi Negrobov, Maslova et Selivanova, sp. n. from Tajikistan is described. The new species is similar to Hercostomus crassiseta Yang et Saigusa, 2001 but differs by the structure of hypopygium, oblongoval epandrium, which length is 1.8 times greater than its width, the top of the phallus with the odontoid process, and to Hercostomus nanus (Macquart, 1827), from which it differs by the structure of cerci, chaetotaxy of mid tibia and long 3rd antennal segment