137 research outputs found
Botanical expedition in mountains of Caucasus in 2013
No full textSummary [editor’s note]The botanical expedition has an important role in documenting unknown flora and its natural history. Such expedition has been instrumental to ascertain what conservation actions the region need of. Gennady A. Firsov writes a short note providing a fascinating account of a botanical expedition in the Caucasus Mountains. His vivid account of geography, climate and flora provide a resemblance between floral diversity with that of physical geography and climate. The six member expedition team visited the highest peak of Caucasus, the Bermamyt plateau, Teberda and Tuman- Lykyel Lake. Teberda, in particular, is a unique floral sanctuary where three seasons can be witnessed at the same time: warm summer down the valley, early spring in alpine meadow and winter further up with snowy storms, glaciers and everlasting snows. The Teberda Biospherical State Nature Reserve harbors 43 species of mammals. The tallest tree (60 m) measured in the expedition was Nordmann’s Fir, which is considered tallest species in Russia. The explorers visited the gorge of Gonachkhir River and the Kyzgych gorge. The Kyzgych gorge is strictly protected regime where flock of aurochs lives in the wild. Here, the team found Lonicera steveniana Fisch. ex Pojark for the first time. They were lucky enough to discover Acer tataricum L. and Euonymus nanus Bieb. in Razvalka mountain.Gennady A. Firsov, G. A. (2017) Botanical expedition in mountains of Caucasus in 2013. Conservation Science, 1: 1-9.</jats:p
New forms of woody plants cultivated at the Peter the Great Botanical Garden
No full textThe article has a description of four new forms (Kalopanax septemlobus (Thunb.) Koidz. f. variegatus Byalt et Firsov forma nova, Cercidiphyllum japonicum Siebold et Zucc. f. piramidale Byalt et Firsov forma nova, Quercus crispula Blume f. fastigiata Byalt et Firsov forma nova, Rhododendron maximum L. f. apetalum Byalt et Firsov forma nova) and the new hybrid Myrica × uchanovii Byalt et Firsov hybridus novus (Myrica gale L.× M. tomentosa (DC.) Aschers. et Graebn.) cultivated at the Peter the Great Botanical Garden in St. Petersburg. We provide information about the origin of the planting material, differences between the new forms from related taxa with Latin diagnoses, type specimens and place of its preservation. The article contains seven photos
New taxa of trees and shrubs at Peter the Great Botanical Garden
No full textThe article describes 4 new forms for science (Acer mayrii Schwer, f. pyramidale V.V. Byalt et Firsov forma nova, Acer platanoides L. f. atropurpureo-viridis V.V. Byalt et Firsov forma nova, Crataegus nigra Waldst. et Kit. f. arcuato-pendula V.V. Byalt et Firsov forma nova, Malus praecox (Pall.) Borkh. f. pyramidale V.V. Byalt et Firsov forma nova, and 2 new hybrids: Betula x zamjatninii V.V. Byalt et Firsov (Betula ermanii Cham. x B. pendula Roth.), Lonicera x zaitzevii V.V. Byalt, A. Byalt et Firsov hybrida nova (Lonicera demissa Rehd. x L. xylosteum L.) Aschers. et Graebn.) cultivated at the Peter the Great Botanical Garden in St. Petersburg. Information on the origin of planting material is given, new forms are distinguished from close taxa (Latin diagnoses are given), typical specimen and their storage locations are indicated. The article is illustrated with 7 photos
Promising species and forms of conifers for Saint-Petersburg city planting
No full textLong-time introductory probations (1980-2016) of arboreal exotic species and cultivars in Saint-Petersburg botanic gardens allow us to recommend 69 taxa, that are seldomly or have not been used for city planting in climatic conditions of the beginning of the XXI century. They belong to 12 genera and 3 families. In comparison to G. A. Firsov and I. V. Fadeeva's recommendations (2009), the list has been extended by 21 taxa. This will allow to widen the range of city planting species and will contribute to creating comfortable living conditions for the city inhabitants
An unknown poem by Gennady Shpalikov
No full textGennady Shpalikov’s poem “Ballada pro tikhoye otchayanie” (‘A Ballad About a Quiet Despair’), dedicated to film director Larisa Shepitko, is hereby published for the first time. The piece survived as part of Shpalikov’s letter to Shepitko dating from the 1960s. The author of the article examines key motifs of the poem and places it in the context of the whole output of the scenarist and poet, showing how it reverberates with his other lyrical pieces as well as screenplays.В статье впервые публикуется стихотворение Геннадия Шпаликова Баллада про тихое отчаяние, посвященное кинорежиссеру Ларисе Шепитько. Стихотворение сохранилось в составе письма Шпаликова к Шепитько и датируется концом 1960-х годов. Автор статьи рассматривает основные мотивы публикуемого стихотворения и ставит его в контекст творчества кинодраматурга и поэта, обнаруживает переклички с другими его лирическими произведениями и сценариями
The Workload process with a Poisson cluster input can look like a Fractional Brownian motion even in the slow growth regime
No full textThe workload process with a Poisson cluster input can look like a Fractional Brownian motion even in the slow growth regime
Vicky Fasen_and Gennady Samorodnitsky ?
May 20, 2008
Abstract
We show that, contrary to the common wisdom, the workload process in a _uid queue with
a cluster Poisson input can converge, in the slow growth regime, to a Fractional Brownian
motion, and not to a L?vy stable motion. This emphasizes lack of robustness of L?vy stable
motions as _bird-eye_ descriptions of the tra_c in communication networks.
AMS 2000 Subject Classi_cations: primary: 90B22 secondary: 60F17
Keywords: cluster Poisson process, _uid queue, Fractional Brownian motion, slow growth regime, scaling limit, workload process
? Center for Mathematical Sciences, TU M?nchen, D-85747 Garching, Germany, email: [email protected]. Parts of the paper were written while the _rst author was visiting the Department of Operations Research and Information Engineering at Cornell University. Financial support from the Deutsche Forschungsgemeinschaft through a research grant is gratefully acknowledged.
?School of Operations Research and Information Engineering, Cornell University, Ithaca, NY 14853, email:
[email protected]. Samorodnitsky's research was partially supported by an NSA grant MSPF-05G-049 and an ARO grant W911NF-07-1-0078 at Cornell University
The North-West of Russia: the potential and areas of Russian-Lithuanian research and innovation cooperation
No full textThis article considers the present state and prospects of Russian-Lithuanian cooperation in the field of research and innovation. The author analyses the tendencies of innovation activities of economic entities in the North-West of Russia in terms of relative innovation activity indicators. Special attention is paid to the role of cross-border and trans-border cooperation in the Baltic macroregion as a mechanism of managing the innovative development of regional economy
Christian Steven (1781–1863) at the Lower Volga
No full textChristian Steven made several excursions to the Caucasus, Crimea and the southern provinces of Russia. He visited occasionally also Lower Volga area and did botanical collections, jointly with Marschall von Bieberstein in 1800. In this article, we present Stevens activity here. He collected plant specimens in Lower Volga area in 1800, 1806, 1811 and 1816. Based on specimens collected here, and in some cases additionally also elsewhere, Steven described Adonis volgensis (1817), Ceratocephala incurva (1848), C. leiocarpa (1848), C. reflexa (1848) and Centaurea gerberi (Steven 1856). Further, Allium sabulosum (Steven ex Bunge 1838) and Delphinium cuneatum (Steven ex DC. 1818) were described based on material Steven collected in this region
The housing market in the Russian Federation : privatization and its implications for market development
No full textThe author reviews sociological data on privatization and the development of a housing market in Russia through 1996. Using data from urban surveys largely unknown outside Russia, she also considers demand for housing and household mobility in Russia. Since early 1997 the Russian government has increasingly focused on housing reform. Current policy calls for a reduction (in stages) of housing subsidies (for which both owners and tenants of privatized apartments are eligible), with the goal of 100 percent cost recovery by 2003. But household incomes are not expected to rise commensurately, so housing's share of the household budget is likely to grow for most Russians. By the end of 1996 about 55 percent of Russian housing was privately owned. The rate of privatization peaked in Moscow in 1993 and has since abated considerably, essentially coming to a halt in 1996. The pattern was the same in smaller cities, but with a later starting date. Not surprisingly, high-quality apartments in city centers have much higher rates of privatization than lower-quality housing some distance from the center. Also affecting the decision to privatize are demographic characteristics of the occupants and household incomes, values, and education levels. Privatization has produced a far-from-uniform class of owners. The two groups most likely to have privatized their apartments--pensioners and the relatively well-off--have quite different effects on the housing market . Pensioners--the larger group--are generally not inclined to move and thus exert a negative effect on housing mobility. The well-off--a much smaller group--can be expected to participate actively in the housing market. There has been some movement toward a more efficient allocation of housing. Because of economic forces, part of the mover households moved from their original apartments to apartments that were somehow inferior. Moreover the housing market allows poorer households to find housing more in keeping with their ability and willingness to pay for it. Many renters in Russia have chosen not to privatize their apartments, influenced largely by the sense of"occupation rights"inherited from the former Soviet Union. Many Russians have little incentive to privatize their housing, but data from Moscow and two smaller cities indicate that market ideas about searching for housing are beginning to penetrate the Russian public's mentality.Real Estate Development,Land andReal Estate Development,Municipal Housing and Land,Banks&Banking Reform,Housing&Human Habitats,Housing&Human Habitats,Urban Housing,Municipal Housing and Land,Real Estate Development,Land and Real Estate Development
Oscillations and Stability of Drilling Systems: Analytical and Numerical Methods
No full textThis work is devoted to study of electromechanical models of the drilling systems actuated by an induction motor. This subject is up-to-date due to the fact that failures of the drilling equipment cause significant time and expenditure losses for the drilling companies. Although there are many papers devoted to the investigation
of the drilling systems, the equipment failures still occur in the drilling industry.
In this study, we continue investigations started by researchers from Eindhoven University of Technology who introduced an experimental model of a drilling system. The model consists of two discs connected with each other by a steel string which may experience torsional deformation only. The upper disc which represents the upper part of the drill-string is connected to the driving part. The lower disc, which represents the end of the drill-string, experiences friction torque caused mainly by interaction with a shale. The key idea of the present
study, that expands and refines the experimental model, was to introduce more complex equations of the driving part and, particularly, to consider the induction motor. Towards this end, two new mathematical models are considered. The first model is a simplified one. Its prototype is an electric hand drill. It can be assumed
that the drill-string is absolutely rigid. Also, another model of a friction torque acting on the lower part of the drill-string is implemented. It is assumed that the friction torque has asymmetric characteristics of the Coulomb type. The qualitative analysis of this model made it possible to obtain conditions on permissible
loads (i.e., permissible values of the friction torque) in case when the system remains in operational mode after the shale’s type changes. With the help of computer modeling, a particular case when there is a sudden load appearance (i.e., when the drill was idle before the transient process) was also studied. The second mathematical model takes into account the torsional deformation of the drill. For the friction torque with an asymmetric characteristic of the Coulomb type, local analysis of the system is provided. In the case of the friction model offered by the researchers from Eindhoven, the computer modeling of the system was carried out by the author. In the context of this modeling, an interesting effect represented by hidden oscillations of the stick-slip type was found. The results of the study have been published in 10 papers (three of which
are indexed in Scopus)
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