Autor: Kuznetsov, A. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Simulation for Service Quality and Berths Occupancy Assessment
Autorzy:: Kuznetsov, A.L.
Kirichenko, A.V.
Tematy:: port operations
berths occupancy assessment
service quality
ship maneuvering
ship handling
simulation technique
berthing
object-oriented simulation; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:: https://bibliotekanauki.pl/articles/117027.pdf Link otwiera się w nowym oknie
Opis:: Current development of the maritime transportation system, namely fleet and ports specialization, growth of vessel sizes, rationalization of routs, trade regionalization etc., has made many traditional approaches and calculation techniques practiced for many long years in port design procedures to be inadequate and insufficient. A generally acknowledged tool for this task today is the simulation technique. In the same time, modern object oriented simulation approach provides usually only ad hoc solution for a project. It lacks the generality that was the main and natural feature of its traditional analytical predecessors. Very high time and labor consumption of simulation comes to a conflict with a very narrow scope of the resulting model’s application domain. This paper describes a new approach used to create a simulation tool for the port designers and planners combining the universality and generality of the analytical (so called “static”) methods with the efficiency and accuracy of the object-oriented simulation. The concept represented in the paper was implemented in the software product, which enabled to conduct experiments that proved the validity and adequacy of the model. The simulation tool was used in several sea port design project and now is a common instrument of several leading port design and consulting company in Russian Federation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Methodological Problems of Modern Transportation Logistics
Autorzy:: Kuznetsov, A. L.
Kirichenko, A. V.
Tematy:: modern transportation logistics
logistics
methodological problems
modern logistics
transportation logistics
sea transportation
global supply chain
logistic supply chain; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:: https://bibliotekanauki.pl/articles/117606.pdf Link otwiera się w nowym oknie
Opis:: The terminology and conceptual apparatus of modern logistics as a scientific discipline is far from being shaped. Researches and developers of legislative and norm-setting documents are obliged to use their own or barrowed terminology, in both case not shared ubiquitously. Consequently, the interpretations even of basic concepts differ significantly. In particular, there exists an academic and practical point of view that refuse the right for existence of the term “transportation logistics”. This clause is explained by the proclaimed omnipresence and universality of logistics, which has in its operational glossary the term “transportation”, treated as a local, subordinated and thus secondary function. This paper tries to set a decisive rule to distinguish between general logistics and transportation logistics, arguing that these two disciplines are well separated by the objects and methodology, knowledge and activities. In transportation logistics defined this way the authors examine two principal components of the transportation processes, storage (warehousing) and movement (shipping). This consideration lead to conclusions that the classical mathematical toolkit is not fitted for the design and management of modern global supply chains.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Box Selectivity in Different Container Cargo-handling Systems
Autorzy:: Kuznetsov, A. L.
Kirichenko, A. L.
Semenov, A. D.
Tematy:: cargo handling
box selectivity
cargo handling system
container
container cargo-handling system
simulation model
theoretical selectivity
artificial intelligence; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:: https://bibliotekanauki.pl/articles/116336.pdf Link otwiera się w nowym oknie
Opis:: The box selectivity in operational stack of container terminal is a quite common and long studied question. The pure random choice is governed by the theory of probability offering some combinatorial estimations. The introduction of operational rules like import/export separation, storage by shipping lines, sorting by rail or truck transportation etc., as well as the most notorious ‘sinking’ effect, i.e. covering of boxes arrived earlier by next cargo parties – all these blur the clear algebraiс picture and lead to appearance of many heuristic outlooks of the problem. A new impetus to this problem in last decades was given by the rapid development of IT, AI and simulation techniques. There are quite many examples of the models described in the scientific publication reflecting many real and arbitrary terminals, which embed very advanced and complicated mechanisms reflecting selected features and strategies. Unfortunately, these models usually are created ad hoc, with some pragmatic objectives and under the demand of closest possible proximity to the simulating objects. There are much less models designated to pure scientific study of the deep inner mechanisms responsible for the primal behavior of the operating container stack, enabling to introduce step by step new rules and restrictions, providing regular proving of every next stage’s adequacy and easy to use. This paper describes one attempt of this kind to create a new theoretical tool to put into the regular toolkit of the container terminal designer. The study starts with mathematical (combinatorial) considerations, proceeds with some restrictions caused by physical and technological characteristics, and ends up with the simulation model, which adequacy is confirmed by practical results.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Simulation Model of Container Land Terminals
Autorzy:: Kuznetsov, A. L.
Kirichenko, A. V.
Eglit, J. J.
Tematy:: marine simulations
simulation model
container land terminals
container terminal
transport infrastructure
object-oriented model
terminal simulation
container; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:: https://bibliotekanauki.pl/articles/116236.pdf Link otwiera się w nowym oknie
Opis:: The simulation as a tool for the design of port and terminals has emerged as an answer for the demand to enhance the quality and reliability of the project results. Very high costs of the project solution implementation and practically total lack of liquidity of transport infrastructure objects always induced the immense commercial risks in the terminal business. Lately these risks have multiplied significantly due to rapid changes on the global and regional markets of transport services. Today, many experts come to see this volatility as an indicator of the next phase in development of the global trade system and the derivative cargo transportation system, specifically the state of temporal saturation. The shift of the global goods volumes from quick and steady growth to relatively small fluctuations around constant values causes quick oscillations in re-distribution of demand over the oversized supply. This new business and economic environment seriously affected the paradigm of transport terminal design and development techniques. The new operational environment of terminals put a request for the designers to arrange the results not in terms of “point”, but in terms of “functions”. Eventually it resulted in development of the modern object-oriented model approach. The wide spread of this approach witnesses the objective demand for this discipline, while in many aspects it remains in the intuitive (pre-paradigmal) phase of its development. The main reason for it is in the problem definition itself, which usually is formulated as the simulation of a given terminal. At the same time, the task is to assess the operational characteristics of the terminal engaged in processing of a given combination of cargo flows. Consequently, it is not the terminal that should be simulated, but the processes of cargo flows handling performed by this terminal under investigation. Another problem that restricts the practical spread of simulation is in the model adequacy. A model which adequacy is not proved has no gnoseological value at all. The paper describes the approach aimed at development of the models with the features discussed above.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Evaluation of sinkingeffect in container stack
Autorzy:: Kuznetsov, A. L.
Kirichenko, A. V.
Semenov, A. D.
Tematy:: containerization
container stack
container
TEU
sinking effect
container logistics
container terminal
container cargo-handling system; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:: https://bibliotekanauki.pl/articles/116631.pdf Link otwiera się w nowym oknie
Opis:: The container yard is the key element of any modern container terminal. The huge amount of boxes dwelling on the operational areas of the terminals could occupy a lot of space, since one-time storage capacity of the container mega terminal handling over one million TEUs annually is something around 20 000 TEUs. The ecological pressure imposed on modern container terminal does not permit to allocate for this storage large land areas, thus forcing the box stacks grow high. The selection of the individual boxes becomes a complex and time-consuming procedure, demanding a lot of technological resources and deteriorating the service quality. The predicted combinatorial growth of redundant moves needed to clear the access to the individual container is aggravated by the well-known and widely discussed ‘sinking effect’, when containers arrived earlier are gradually covered by the ones arriving afterwards. While the random selection could be adequately assessed by combinatorial methods, the ‘sinking effect’ allows neither intuitive consideration, nor any traditional mathematical means. The only practical way to treat this problem today is in simulation, but the simulation itself causes yet another problem: the problem of model adequacy. This study deals with one possible approach to the problem designated to prove its validity and adequacy, without which the simulation has naught gnoseological value.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

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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Skocz do pozycji: 7.

Tytuł:: Reentrant Metal-Insulator Transition in $Ca_{1-x}Eu_{x}B_{6}$
Autorzy:: Glushkov, V.
Anisimov, M.
Baybakov, R.
Demishev, S.
Filippov, V.
Flachbart, K.
Kuznetsov, A.
Shitsevalova, N.
Sluchanko, N.
Tematy:: 71.30.+h
72.15.Gd
75.47.Gk; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1369362.pdf Link otwiera się w nowym oknie
Opis:: Resistivity, Hall and Seebeck effects have been studied on single crystals of $Ca_{1-x}Eu_{x}B_{6}$ (0 ≤ x ≤ 1) at temperatures 2-300 K and in magnetic fields up to 8 T. An insulating ground state is found to be limited by narrow range of Eu doping 0.6 ≤ x ≤ 0.8. This region is characterized by an enhanced colossal magnetoresistance (CMR), which reaches values of ρ(0)/ρ(7T) > $10^{6}$ for x = 0.63 at T < 10 K. Decreasing of Eu content in $Ca_{1-x}Eu_{x}B_{6}$ below x* ≈ 0.6 restores the metallic ground state with moderate resistivity (ρ ~ 1 ÷ 5 mΩ·cm) and CMR amplitude (ρ(0)/ρ(7T) < 7). The second metal-insulator transition (MIT) in $Ca_{1-x}Eu_{x}B_{6}$ is observed beyond the whole conductivity region found earlier in the narrow range of Eu doping (0.7 ≤ x ≤ 0.8). The correlation between the enhanced CMR amplitude, the onset of positive diffusive thermopower and the elevation of anomalous Hall effect, determined for Eu content 0.6 ≤ x ≤ 0.85, favors the idea that a smooth change of band structure is the main factor governing the reentrant MIT in $Ca_{1-x}Eu_{x}B_{6}$.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Hall Effect in $GdB_{6}$
Autorzy:: Anisimov, M.
Bogach, A.
Glushkov, V.
Demishev, S.
Samarin, N.
Shitsevalova, N.
Levchenko, A.
Filippov, V.
Kuznetsov, A.
Flachbart, K.
Sluchanko, N.
Tematy:: 72.15.Gd; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1371548.pdf Link otwiera się w nowym oknie
Opis:: The Hall effect of $GdB_{6}$ has been studied on high quality single crystals in the temperature range 2-150 K and in magnetic field of 1 T. The obtained data allow to detect anomalies in the antiferromagnetic (AF) phase including (i) a drastic enhancement of negative Hall coefficient below $T_{N1}$ ≈ 15.5 K and (ii) the appearance of an anomalous Hall effect at $T_{N2}$ ≈ 4.7 K. Possible scenarios of the AF ground state formation are discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Charge Transport and Magnetism in $Eu_{1-x}Ca_{x}B_6$
Autorzy:: Glushkov, V.
Anisimov, M.
Batko, I.
Batkova, M.
Bogach, A.
Demishev, S.
Filipov, V.
Flachbart, K.
Kuznetsov, A.
Sannikov, I.
Shitsevalova, N.
Sluchanko, N.
Tematy:: 71.30.+h
75.30.Cr
75.40.-s
75.47.Gk; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1534292.pdf Link otwiera się w nowym oknie
Opis:: Transport, magnetic and thermal properties of substitutional solid solution $Eu_{1 - x}Ca_{x}B_6$ single crystals (0 ≤ x ≤ 0.244) have been studied at 1.8 ≤ T ≤ 300 K and in magnetic fields up to 8 T. Calcium doping is shown to result in a metal-insulator transition, which occurs at x_{MIT} ≈ 0.2. In vicinity of metal-insulator transition the effect of colossal magnetoresistance is found to be very sensitive to Ca content, the amplitude varying from Δ = [ ρ (0)- ρ (8T)]/ρ(8T) ≈1.4 × $10^2$ to Δ ≈ 7.5 × $10^3$ for 0.14 ≤ x ≤ 0.16. The analysis of magnetic contribution to heat capacity shows that a large amount of magnetic entropy ( ≈ 30%) releases in $Eu_{0.845}Ca_{0.155}B_6$ when moving from the Curie temperature $T_{C}$ ≈ 5.5 K to the characteristic one T* ≈ 30 K. This observation as well as the large amplitude of low field colossal magnetoresistance effect and the deviation of magnetic susceptibility from the Curie-Weiss law detected for x = 0.155 compound in the interval $T_{C}$ ≤ T ≤ T* seem to be associated with magnetic phase separation induced by Ca doping.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: THz Spectroscopy of Extremely Shallow Acceptors States in Ge/GeSi Multiple-Quantum-Well Heterostructures
Autorzy:: Aleshkin, V. Ya.
Erofeeva, Y. V.
Gavrilenko, V. I.
Ikonnikov, A. V.
Kozlov, D. V.
Kuznetsov, O. A.
Veksler, D. B.
Tematy:: 71.55.Cn
76.90.+d
78.67.De; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2041651.pdf Link otwiera się w nowym oknie
Opis:: New shallow acceptor magnetoabsorption lines in THz range have been discovered under bandgap photoexcitation in strained Ge/GeSi multiple-quantum-well heterostructures. It is shown, both theoretically and experimentally, that the resonant absorption results from the photoionization of A$\text{}^{+}$-centers and from 1s → 2p$\text{}_{+}$-type transitions from the ground state of the barrier-situated A$\text{}^{0}$-centers into excited states in the 1st and 2nd electronic subbands. The shallowest discovered ground acceptor states (E$\text{}_{B}$≤0.5 meV) are attributed to the "barrier-spaced" acceptors (a hole bound with an acceptor ion in the neighboring Ge quantum well).
Dostawca treści:: Biblioteka Nauki

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