623 research outputs found
Structural features of high-chromium cast iron surface layers decarburization under destabilizing heating
No full textStructural features of high-chromium cast iron surface layers decarburization under destabilizing heating / V. G. Efremenko [и др.] // Інноваційні ресурсозбережні матеріали та зміцнювальні технології : матеріали Міжнар. наук.-практ. конф. 6-8 червня 2012, м. Маріуполь / ДВНЗ «ПДТУ». – Маріуполь, 2012. – С. 39-40
Austempering vs. Q&P: Comparative effects on microstructure and mechanical properties of complex-alloyed TRIP-assisted steel
No full textThis study compares the effect of austempering (AT) and two-step quenching and partitioning (Q&P) treatments on the microstructure and mechanical properties of a 0.2 wt% C Mn-Si-Cr-Mo-V-Nb TRIP-assisted steel. Both treatments included austenitization (770 °C or 900 °C) followed by quenching and isothermal holding (20 min). AT used a 350 °C isothermal hold, while Q&P involved quenching to 200 °C or 230 °C, followed by partitioning at 350 °C. Microstructural analysis (OM, SEM, XRD, EPMA, EBSD) revealed ferrite and (Nb,V)C in both treatments, with bainite (AT) or tempered martensite/bainite (Q&P) and varying retained austenite (RA) content depending on the austenitization temperature. Austenitization at 770 °C resulted in Cr- and Mo-promoted cementite precipitation, reducing the RA volume fraction and ductility. In contrast, 900 °C austenitization resulted in a cementite-free structure with 7–9 vol% RA exhibiting a clear TRIP effect. The ultimate tensile strength (UTS) increased with austenitization temperature (820–880 MPa to 1040–1090 MPa) due to a decreased proeutectoid ferrite, grain refinement, and enhanced TRIP effect, though at some expense of ductility/toughness. Under the same austenitization parameters, Q&P yielded slightly higher UTS (∼ 50 MPa higher), and much greater impact toughness (by 2 times at 770 °C and 1.4 times at 900 °C). Due to a superior strength-ductility-toughness balance, Q&P is identified as a more promising heat treatment for this TRIP-assisted steel
Recommended from our members
Prospects of a baryon instability search in neutron-antineutron oscillations
No full textThe purpose of this article is to review the current status and the future prospects for an experimental neutron-antineutron transition search. Traditional and new experimental techniques are discussed here. In the n {r_arrow} {anti n} search in experiments at existing reactors, it would be possible to increase the discovery potential up to four orders of magnitude for vacuum n {r_arrow} {anti n} transitions relative to the existing experimental level or to achieve the limit of {tau}{sub n-{anti n}{sup {approximately}}} 10{sup 10}s.. With dedicated future reactors and an ultimate experimental layout, it might be possible to reach the limit of 10{sup 11}s. Significant progress in an intranuclear n {r_arrow} {anti n} transition search expected to be made during the next decade by the SuperKamiokande and Icarus detectors. It can be matched, or even exceeded, in a new alternative approach, where unstable long-lived isotopes of technetium are searched in non radioactive deep-mined ores
Search for Pauli exclusion principle violating atomic transitions and electron decay with a p-type point contact germanium detector
No full textA search for Pauli-exclusion-principle-violating K-alpha electron transitions was performed using 89.5 kg-d of data collected with a p-type point contact high-purity germanium detector operated at the Kimballton Underground Research Facility. A lower limit on the transition lifetime of 5.8x10^30 seconds at 90% C.L. was set by looking for a peak at 10.6 keV resulting from the x-ray and Auger electrons present following the transition. A similar analysis was done to look for the decay of atomic K-shell electrons into neutrinos, resulting in a lower limit of 6.8x10^30 seconds at 90 C.L. It is estimated that the MAJORANA DEMONSTRATOR, a 44 kg array of p-type point contact detectors that will search for the neutrinoless double-beta decay of 76-Ge, could improve upon these exclusion limits by an order of magnitude after three years of operation. Abgrall, N; Arnquist, I J; Avignone, F T; Barabash, A S; Bertrand, F E; Bradley, A W; Brudanin, V; Busch, M; Buuck, M; Caldwell, A S; Chan, Y-D; Christofferson, C D; Chu, P -H; Cuesta, C; Detwiler, J A; Dunagan, C; Efremenko, Yu; Ejiri, H; Elliott, S R; Finnerty, P S; Galindo-Uribarri, A; Gilliss, T; Giovanetti, G K; Goett, J; Green, M P; Gruszko, J; Guinn, I S; Guiseppe, V E; Henning, R; Hoppe, E W; Howard, S; Howe, M A; Jasinski, B R; Keeter, K J; Kidd, M F; Konovalov, S I; Kouzes, R T; LaFerriere, B D; Leon, J; MacMullin, J; Martin, R D; Massarczyk, R; Meijer, S J; Mertens, S; Orrell, J L; O'Shaughnessy, C; Poon, A W P; Radford, D C; Rager, J; Rielage, K; Robertson, R G H; Romero-Romero, E; Shanks, B; Shirchenko, M; Suriano, A M; Tedeschi, D; Trimble, J E; Varner, R L; Vasilyev, S; Vetter, K; Vorren, K; White, B R; Wilkerson, J F; Wiseman, C; Xu, W; Yakushev, E; Yu, C -H; Yumatov, V; Zhitnikov,
Pedophilia as Part of the Identity of the Offender in the Investigation of Violent Crimes of a Sexual NatureCommitted Against Minors
No full textThe Author based on the analysis of various scientific investigations defines the term «pedophilia» and identifies persons who are pedophiles. In addition, the Author expresses the view that pedophilia as part of the offender, as well as the effect of pedophilia in the methodology of the investigation of violent sexual offenses committed against minors
Новейшие заимствования во вьетнамском языке
No full textДанная работа посвящена анализу новейших заимствований во вьетнамском языке. Под новейшими заимствованиями автор понимает лексику, заимствованную во вьетнамском языке с 1986 года, т.е. с начала политики обновления во Вьетнаме, периода, когда Вьетнам делает первые шаги к глобализации. Для анализа были выбраны социальные сети и сетевые периодические издания.
Работа состоит из Введения, трех глав, Заключения, Списка использованной литературы и источников. Общее количество страниц в работе – 33. Список литературы и источников содержит 19 наименований, среди которых работы на русском, английском и вьетнамском языках.The graduation paper is devoted to the analysis of the recent borrowings in Vietnamese language. By saying ‘recent’ author means words, which has been borrowed in Vietnamese since 1986 i.e. from the beginning of renovation policy in Vietnam. This is the period, when Vietnamese government is taking first steps towards globalization. Social networks and network periodicals were chosen as an object of analysis.
The work consists of the Introduction, three chapters, the Conclusion, the List of references. The total number of pages is 33. The List of references contains 19 items in Russian, English and Vietnamese
A native insect on a non-native plant
No full textThe trans-Palearctic moth Phyllonorycter populifoliella (Lepidoptera: Gracillariidae) is a major pest of the North American Populus balsamifera and its hybrids widely planted as ornamentals in North Asia (i.e., the Asian part of Russia). We DNA barcoded Ph. populifoliella from distant geographical populations in Russia and analyzed them together with the data from eight European countries and India to estimate intraspecific variability and the haplotype richness in the Palearctic, and specifically in North Asia. Furthermore, using next-generation sequencing (NGS, Sequel platform, PacBio), we investigated larval and pupal remnants found in an old herbarium from the Nearctic, where P. balsamifera occurs naturally, to verify if any events of the moth introduction to this biogeographic zone happened in the past. Relatively high intraspecific variability in the COI gene of mtDNA, reaching 3.73%, was recorded in Ph. populifoliella. Overall, 30 COI haplotypes were defined in 83 specimens from the Palearctic, with a noticeable richness in North Asia (21 haplotypes). Using NGS, the remnants of 14 Phyllonorycter specimens dissected from up to 174-year-old herbaria from the Palearctic and Nearctic were sequenced, and four moth species were identified. Among them, there were three Palearctic species, Ph. populifoliella, Ph. pastorella (Zeller), and Ph. apparella (Herrich-Schäffer), and one Nearctic, Ph. nipigon (Freeman). No evidence of Ph. populifoliella introduction to North America was documented based on the examination of the herbarium dated 1850–1974. Three specimens of Ph. populifoliella identified from herbaria from Austria and Poland (dated 1879–1931) represented one haplotype (H7) known from the recent time. Overall, our study clarifies the modern range, provides insights into phylogeography, and defines the haplotype richness of the native leafminer outbreaking on the alien host. Furthermore, it underlines the use of old herbaria to explore the historical distribution of endophagous insect species
The Shanghai Cooperation Organization after Enlargement: New Challenges and Prospects
No full textThe paper examines new challenges that confront the Shanghai Cooperation Organization (SCO) after India and Pakistan have joined it as full-fledged members. This enlargement of the SCO implies a considerable increase in its political and economic weight, as well as additional interstate contradictions, which have previously had a peripheral significance for the SCO.In that regard special attention is drawn to the new political dynamics within the SCO. The author argues that cooperation within the Russia-India-China triangle (RIC) will play a decisive role for the SCO development. In this context, two scenarios are outlined. The first one envisages that the Russo-Chinese and Russo-Indian relations will have a positive dynamics while the Chinese-Indian relations will remain troubled. It is stressed that India’s participation in the SCO is likely to become another factor which will prevent the evolution of the Organization into anti-Western geopolitical alliance. Under favorable conditions, all three powers will be able to formulate a common position with regard to the most crucial international issues or to respond promptly to negative tendencies in the economic and security spheres. The second scenario involves a gradual deepening and extension of cooperation in the RIC format based on a common vision of geopolitical transformations within the Greater Eurasia. In this case, it can be assumed that over time the SCO will become the basis for the formation of the Greater Eurasian Partnership.Another important topic covered in the paper is a security problem which is a traditional priority of the SCO policy in general and in the Central Asia region in particular. This issue has acquired new dimensions due to the Organization’s enlargement and the growth of its geopolitical role. In 2018–2019 the SCO powers, together and separately, have made a decisive contribution to the settlement of inter-Afghanistan conflict when the US and NATO troops had been withdrawn from Afghanistan. Moreover, it was due to the SCO efforts that the breakthrough of extremist and terrorist groups from Afghanistan to the Central Asia countries was prevented. The author concludes that in the coming years the SCO will play the key role in structuring the Greater Eurasia and strengthening the multipolar world order
Means of protection of biometric passports / O. S. Bocharovа, N. V. Efremenko
No full textБочарова, О. С. Средства защиты биометрических паспортов / О. С. Бочарова, Н. В. Ефременко // Вестник Академии МВД Республики Беларусь. - 2015. - № 1. - С. 67 - 72.Рассматриваются актуальные вопросы защиты персональных данных в электронных паспортах с
биометрической информацией. Предложена классификация методов биометрической идентификации.
Проанализировано использование биометрических технологий в паспортах стран западной Европы, США, России, Беларуси, Узбекистана, Молдовы. Рекомендованы меры по гармонизации биометрических документов Республики Беларусь с мировыми стандартами. = The article deals with the actual issues of protection of personal data in electronic passports containing biometric information. The author offers classification of methods of biometric identification. Analyzed the use of biometric technologies in passports of countries of Western Europe, USA, Russia, Republic of Belarus, Uzbekistan, Moldova. Harmonization of biometric documents of the Republic of Belarus with the international standards is
highly recommended
- …
