Autor: Kuznetsov, S - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Stress and displacement intensity factors of cracks in anisotropic media
Autorzy:: Kuznetsov, S.
Karakozova, A.
Tematy:: naprężenie
anizotropia
pęknięcie
stress intensity factor
displacement intensity factor
anisotropy
asymptote
crack
pseudo-differential equation; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/1839788.pdf Link otwiera się w nowym oknie
Opis:: A relation connecting stress intensity factors (SIF) with displacement intensity factors (DIF) at the crack front is derived by solving a pseudodifferential equation connecting stress and displacement discontinuity fields for a plane crack in an elastic anisotropic medium with arbitrary anisotropy. It is found that at a particular point on the crack front, the vector valued SIF is uniquely determined by the corresponding DIF evaluated at the same point.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Badania modelowe liczby Strouhala oblodzonego cięgna mostu podwieszonego
Model investigations of Strouhal number of iced cable of cable-stayed bridge
Autorzy:: Górski, P.
Pospišil, S
Kuznetsov, S
Tatara, M.
Marušić, A
Tematy:: aerodynamika
oblodzenie
cięgno
liczba Strouhala
wzbudzenie wirowe
aerodynamic
icing
cable
Strouhal number
vortex shedding; Pokaż więcej
Wydawca:: Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Powiązania:: https://bibliotekanauki.pl/articles/391183.pdf Link otwiera się w nowym oknie
Opis:: W artykule przedstawiono sposób i wyniki badań liczby Strouhala nieruchomego modelu oblodzonego cięgna mostu podwieszonego. Badania wykonano w tunelu aerodynamicznym z komorą klimatyczną Laboratorium Czeskiej Akademii Nauk w Telc. W komorze klimatycznej wykonano doświadczalne oblodzenie modelu cięgna o osi nachylonej pod kątem 300 do płaszczyzny poziomej. Kształt oblodzonej powierzchni zarejestrowano metodą fotogrametrii cyfrowej. Do badań w tunelu aerodynamicznym wykonano nowy model sekcyjny oblodzonego cięgna metodą druku 3D. Liczbę Strouhala wyznaczono w zakresie wartości liczby Reynoldsa od 28 do 122 na podstawie pomiaru częstości odrywania się wirów w śladzie aerodynamicznym za modelem.
The paper presents the method and results of wind tunnel investigations of Strouhal number of stationary iced cable model of cable-stayed bridge. The investigations were performed in a Climatic Wind Tunnel Laboratory of the Czech Academy of Sciences in Telc. The experimental icing of the inclined cable model in the climatic chamber of the laboratory was made. The shape of the iced model was registered by a numerical photogrammetry method. For the aerodynamic tunnel investigations, the new iced cable model was made by using 3D printing method. The Strouhal number was determined within the range of the Reynolds number between 28·103 and 122·103, on the basis of the dominant vortex shedding frequency measured in the flow behind the model.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Determination of Polyolefine Based Composites Nanostructure Parameters by Very Cold Neutrons Scattering
Autorzy:: Kuznetsov, S.
Dubnikova, I.
Litvin, V.
Meshkov, I.
Shelagin, A.
Udovenko, A.
Tematy:: 61.05.fm
61.48.De
82.35.Np; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1537817.pdf Link otwiera się w nowym oknie
Opis:: Very cold neutrons (VCN) scattering method was used to study the morphology of polyolefine based nanocomposites. The nanocomposites were prepared by the melt mixing method. The special surface active additions and the fillers surface modification were used to improve the polymer-filler compatibility. The multiwalled carbon nanotubes (MWCNT), the calcium carbonate (CC) submicron particles and the layered natural mineral montmorillonite (MMT) nanoparticles were used as the fillers. The fractal structural model was used to describe the VCN scattering on the nanofillers agglomerates. It was shown by VCN scattering that the volume part of isolated MWCNTs in polypropylene (PP) based composites decreases with the increase of the filler loading, the density of MWCNT packing in agglomerates increases with the total volume nanotube concentration and decreases with the nanotube surface modification. It was revealed that the isolated CC particles are dominated in the CC/PP samples with low CC (5 vol.%) loading. It was shown that practically full MMT exfoliation within polyethylene (PE) matrix can be achieved by both polymerization exfoliation method and by melt mixing compounding with using special polar polymer additions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The Assessment of Alumina Production Waste Impact on Natural Water
Autorzy:: Kuznetsov, V. S.
Suprun, I. K.
Tematy:: alumina
red mud
utilisation
sludge dump; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/123535.pdf Link otwiera się w nowym oknie
Opis:: The paper is dedicated to the issue of assessment of alumina (red mud) production waste on natural water. The growth of the number of aluminium-producing facilities leads to the expansion of exclusion areas to store the production waste – sludge dumps. A considerable part of research on red mud utilisation is focused on its use in the iron-and-steel industry. Furthermore, the technologies of red mud usage in the construction industry gain substantial significance for land reclamation, isolation of polluted industrial and agricultural lands as well as the effluent and industrial emissions treatment.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Reduction of an Adverse Impact During Well Drilling by Means of Drilling Waste Usage
Autorzy:: Kuznetsov, V. S.
Suprun, I. K.
Tematy:: bore mud
utilisation
toxicity
well site
sludge pit
dehumidification
oil production
refining
expression
waste treatment; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/125400.pdf Link otwiera się w nowym oknie
Opis:: The problem of drilling waste utilisation is assumed to be resolved through the implementation of the complex of environment protection measures in production engineering. They include primarily the use in the process of well drilling of drilling mud on the basis of water-soluble biodegradable polymers and a four-stage drilling mud refining system. Secondly, the usage of the well site construction with trenching for allocation of expressed bore mud and a temporary ground tank for drilling waste water.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Assessing the Environmental Condition of Minor Rivers in Urban Areas
Autorzy:: Kuznetsov, V. S.
Petrov, D.S.
Tematy:: sediment pollution
minor rivers
oil product pollution
environmental monitoring
heavy metal pollution; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/124132.pdf Link otwiera się w nowym oknie
Opis:: This article is devoted to the study of water and sediment pollution in the channel of the Neva delta. Spectrophotometry was used to determine the concentration of pollutants in water. In the chemical analysis of the precipitate, atomic absorption spectroscopy and infrared spectroscopy were used. Analysis of the hydrochemical composition and sediment of the Smolenka River showed high concentrations of heavy metals and petroleum products. At the same time, the hydrochemical composition of the Smolenka River is highly unstable, but the concentration of oil products and lead in the sediments indicates the presence of local pollution sources. Based on our findings, we are guided by the restoration of the aquatic environment.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Development of an Engineer Operation Aimed at the Reduction of Atmospheric Dust Pollution in the Decommissioning of Iron-Ore Treatment Waste
Autorzy:: Suprun, Igor
Kuznetsov, Vladimir S.
Ivanov, Andrey V.
Tematy:: reduction
dust pollution
decommissioning
iron-ore waste; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/123979.pdf Link otwiera się w nowym oknie
Opis:: This work covers the pollution of the atmosphere during the work of the Mikhailovsky Mining and Refining Facility which is located within 100 km from the city of Kursk, in the city of Zheleznogorsk. Over the past few years in the whole world, the anthropogenic activity, connected mainly with the locations of mineral production and those of mineral treatment and processing, has become increasingly dangerous for the natural environment. Resource development in open pits causes the formation of inorganic dust. The dust is released into the atmosphere at all stages of the enterprise’s technical process. The principal sources generating inorganic dust during open mining of iron deposits include: blasting operations in an open pit, the work of transfer points, the enrichment process at a factory, pellet firing as well as dusting from the surfaces of stock dumps and dry tailings beaches.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The Wastewater Disposal System Modernization during Processing of Amber Deposit as a Way to Reduce the Anthropogenic Load on the Baltic Sea Ecosystem
Autorzy:: Strizhenok, Alexey V.
Korelskiy, Denis S.
Kuznetsov, Vladimir S.
Tematy:: wastewater discharge
pollution
environmental monitoring
Baltic Sea
ecosystem
tailing dump
amber-succinite
recycled water supply; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/123796.pdf Link otwiera się w nowym oknie
Opis:: The research is devoted to assessing the negative impact of the amber-succinite deposit in the Kaliningrad region as one of the sources of complex pollution of the Baltic Sea waters. The Baltic Sea is one of the most polluted water bodies in Europe today. There are many natural and anthropogenic factors that cause this ecological situation. Industry is one of the significant contributors to the pollution of the waters of the Baltic Sea. The industrial wastewater discharged into the Baltic Sea often does not comply with the state ecological standards. The wastewater disposal system modernization by creating a recycled water supply is one of the most effective ways to reduce the negative impact of industrial wastewater on the Baltic Sea ecosystem nowadays. This technological solution allows to significantly reduce or to completely prevent the discharge of wastewater into the Baltic Sea.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Agrophysical properties of soil and its erosion-preventive stability
Agrofizyczne właściwości gleby i jej stabilność przeciwerozyjna
Agrofizicheskie svojjstva pochvy i ejo protivoehrozionnaja stabil'nost'
Autorzy:: Kuznetsov, M.S.
Grygoriev, V.Y.
Hun, C.Y.
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:: https://bibliotekanauki.pl/articles/807108.pdf Link otwiera się w nowym oknie
Opis:: Some agrophysical properties with their relation to soil erosion caused by water flow are discussed. The paper presents an improved equation of the bottom-scouring velocity which is used as a measure of erosion-preventive stability. The main components of the equation are water stability of soil structure and soil cohesion, determined by a new water-jet method.
W pracy omówiono niektóre agrofizyczne właściwości gleby w aspekcie zjawisk erozji wodnej, głównie spływu powierzchniowego. Jako miarę stabilności przeciwerozyjnej gleby zastosowano prędkość ścierania dna żłobiny, tj. prędkość krytyczną, rozpoczynającą stałe przemieszczanie cząstek w żłobinie. Autorzy przedstawili ulepszone równanie opisujące tę wielkość. Główne elementy równania stanowią: współczynnik wodoodporności struktury gleby i współczynnik kohezji gleby, wyznaczony według nowej metody polegającej na pomiarze strumienia wody (water jet).
В работе рассматриваются некоторые агрофизические свойства почвы со стороны явлений, связанных с водяной эрозией, главным образом с поверхностным стоком. Мерой противоэрозионной стабильности почвы послужила скорость стирания дна ложбины, т.е. критическая скорость, начинающая постоянное перемещение частиц в ложбине. Авторы представили улучшенное уравнение, описывающее эту величину. Главными элементами уравнения являются: коэффициент водоустойчивости структуры почвы и коэффициент когезии почвы, определённый по новому методу, использующему измерение потока воды (water jet).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: δ13 C variation in carbonate platform sediments of the Northern Tethys in Late Jurassic
Autorzy:: Rudko, S.V.
Kuznetsov, A.B.
Pokrovsky, B.G.
Tematy:: paleogeographical model
paleoecological model
inclination; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/184621.pdf Link otwiera się w nowym oknie
Opis:: Сarbon isotopic composition of Late Jurassic sediments displays a trend of 13 C depletion in the World ocean. Meanwhile, depending on local paleogeographical conditions, δ 13 C curves for different palaeoprovinces differ in inclinations and absolute values (Nunn & Price 2010). That is why a separate δ 13 C curve needs to be developed for every specific region. After such development, the inverse problem – correlation of the sedimentary complex by comparing δ 13 C parameters – can be solved. A comparison of δ 13 C values in contemporaneous sediments can be also used as an instrument for testing paleogeographical and paleoecological models. Previous δ 13 C data for the Upper Jurassic sediments of the Tethys region were obtained for its Western passive margin and Central Atlantics (Padden et al. 2002, Coimbra et al. 2009). These data have been acquired from precisely dated hemipelagic sediments containing index fauna and epioceanic Ammonitico-Rosso facies. In the current study we present δ 13 C variations in carbonate platform sediments from the backarc basin of the Northern Tethys (N20° to N40°) (Meijers et al. 2010) mostly based on Sr-chemostratigraphic correlation and dating of carbonate complexes. We studied Sr, C and O isotopic composition of the Upper Jurassic carbonate complexes of the Crimean Mountains. These complexes were formed under different conditions: Kimmeridgian and Early Tithonian sediments were deposited in shallow-water carbonate platform settings. In most cases they lack index fossils and their age is defined by Sr-chemostratigraphy (Rudko et al. 2014); Late Tithonian to Early Berriasian sediments were sampled from a carbonate platform reef facies, slope and toe of slope carbonate megabreccias. Reef and breccias deposits were dated using Sr-chemostratigraphy, and confirmed by calpionellide biostratigraphy. In the absence of well preserved faunal remnants in the studied sections, limestone samples with the best preservation of primary sedimentary textures were collected for Sr isotopic–geochemical studies. Samples with large calcite veins or abundant epigenetic sparite were excluded from this research. Limestone samples for reconstructing the 87 Sr/ 86 Sr isotopic parameters of depositional environments were selected using geochemical criteria (Mn/Sr < 0.2, Fe/Sr < 1.6, Mg/Ca < 0.024; δ 18 О > −1.5‰) and subjected to preliminary treatment in a 1 N ammonium acetate solution. From more then 100 analyzed samples only 13 best preserved were used to provide correlation between sections and the age of strata. Most of samples used to determine C isotopic composition are represented by micritic limestones with low content of sparry cements and fragments of primary aragonitic grains. The content of insoluble impurities in limestones does not exceed 9%. All selected samples display no correlation between the amount of siliciclastic impurities, δ 13 C and δ 18 О values. δ 13 C values in the measured samples vary between +1 and 3.5‰, δ 18 О: from −2.9‰ to +1,3‰. C – isotopic composition in 44 samples was considered to be diagenetically unaffected and they were selected to provide δ 13 C curve. According to the results of comparison of stable isotope composition with microfacies of samples, δ 13 C values are not environment-dependent in contrast to δ 18 О, which are slightly enriched in 18 O in offshore and slope facies. The measured values of δ 13 С are falling from an average 3.2‰ in Late Kimmeridgian through 2.6‰ in Early Tithonian to 1.7‰ in Late Tithonian – Early Berriasian. This corresponds to the global δ 13 С trend in Upper Jurassic sediments (Nunn & Price 2010). Among other Kimmeridgian – Berriasian carbonates the Northern Tethys carbonate platform deposits are 0.5–1‰ higher than δ 13 С from the Western Tethys (Coimbra et al. 2009). The following factors (or their combinations) may explain observed 13 C-enriched isotopic composition of the Northern Tethyan backarc basin deposits: 1. increased amount of shallow-water allochems and cements in the sediments of carbonate platform and its aprons, compared to hemipelagites of Western Tethyan margin; 2. increased bioproductivity of photosynthetic organisms – cyanobacteria and green algae that played an important role in the studied Upper Jurassic carbonate platform deposits (Krajewski 2010, Piskunov et al. 2012, Bucur et al. 2014), removed large quantity of light carbon from water, leading to 13 C enrichment of bicarbonate. It is interesting to note that volcanic activity on Tethyan active margin seems not to have an impact on δ 13 С values of the studied sediments.
Dostawca treści:: Biblioteka Nauki

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