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    Wyświetlanie 1-5 z 5
    Tytuł:
    Process Optimization and Characterization of an HMX/Viton Nanocomposite
    Autorzy:
    Shi, X.
    Wang, C.
    Wang, J.
    Li, X.
    An, C.
    Ji, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/358667.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    HMX
    spray drying
    processing parameters
    optimization
    impact sensitivity
    nanoparticles
    Opis:
    HMX/Viton A nanocomposites were prepared by a spray drying process using different processing parameters, which included the dry gas inlet temperature, the air flow rate, and the solution feed flow rate. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the nanocomposites. The effects of the processing parameters on the morphology of the samples were investigated and are discussed. The thermal decomposition behaviour and impact sensitivity of the raw HMX and HMX/Viton A nanocomposites were also measured and compared. Optimal morphology and dispersion of the coated samples was achieved when the dry gas inlet temperature and the air and solution feed flow rates were 55 °C, 660 L/h and 1.5 mL/min, respectively. Under these optimal processing conditions, the nanocomposites were spherical in shape, ranged from 0.2-2 μm in size, and were composed of many tiny particles of 50-100 nm in size. The crystal phase of the nanocomposites was the same as that of raw HMX. Compared with those of raw HMX, the melting point and impact sensitivity of the nanocomposites were lower and the thermal decomposition rate was slightly higher.
    Źródło:
    Central European Journal of Energetic Materials; 2015, 12, 3; 487-495
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decide : agents controlling a BHS of an airport hub
    Autorzy:
    Hallenborg, K.
    Risager, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/384437.pdf
    Data publikacji:
    2007
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    control
    optimization
    aircraft transportation
    Opis:
    It is an ingrown fsar to most travelers, frequent or not, to lose their baggage while flying from one destination to another, but if you take a look behind the scene you will experience a system with a complexity unlike most others. The baggage handling system (BHS) of an airport is just one link in a Song chain of processes your bag is going through. The BHS stretches from check-in or unloading of a plane on to the BHS (connecting flights), to it is collected at the gate and transferred to your flight. The conventional control software use a strategy primarily based on a shortest path algorithm, not taking into account dynamical changes or utilizing less packed areas of the system to increase capacity. We changed that perspective towards a ecentralized multi-agent based solution by developing strongty collaborating agents, to replace the original control software. The hierarchy of agents horizontally spans the system through local agents capable of altering the flow of totes, and vertica!ly through mediator agents, which have a global perspective andsupport decisions ofthe locoi autonomous agents. The local agents monitors their own local neighborhood for rising queues and other delaying factors, which aggregate to a status of the node, influencing the decision, of other agents trying to loute totes through this node. Interactions are handled as a combination of contract-nets, queries, and subscriber interaction schemes, which generalized the agent interfaces from the specific application. An agent-based approach not only improves robustness of the system, and utilize the entire BHS in n more convenient and dynamical way, it also include strategies for maximizing capacify of the system, which follows a work in-progress against capadty curve (WIPAC). In this paper we present the agent-based design of the control-software, and elaborate on the mutual colloboration compliant with the FIPA interaction schemes. We present ontologies used for sharing information and services among the agents as well as the results of our work for a major airport hub in Asia, and compare it against the traditional centralized strategies. We complete the paper by drawing same condusions and present ideas for future work.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2007, 1, 2; 50-54
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Assessment of High-Order-Mode Analysis and Shape Optimization of Expansion Chamber Mufflers
    Autorzy:
    Chiu, M. C.
    Chang, Y. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/178079.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    higher order wave
    eigenfunction
    optimization
    genetic algorithm
    Opis:
    A substantial quantity of research on muffler design has been restricted to a low frequency range using the plane wave theory. Based on this theory, which is a one-dimensional wave, no higher order wave has been considered. This has resulted in underestimating acoustical performances at higher frequencies when doing muffler analysis via the plane wave model. To overcome the above drawbacks, researchers have assessed a three-dimensional wave propagating for a simple expansion chamber muffler. Therefore, the acoustic effect of a higher order wave (a high frequency wave) is considered here. Unfortunately, there has been scant research on expansion chamber mufflers equipped with baffle plates that enhance noise elimination using a higher-order-mode analysis. Also, space-constrained conditions of industrial muffler designs have never been properly addressed. So, in order to improve the acoustical performance of an expansion chamber muffler within a constrained space, the optimization of an expansion chamber muffler hybridized with multiple baffle plates will be assessed. In this paper, the acoustical model of the expansion chamber muffler will be established by assuming that it is a rigid rectangular tube driven by a piston along the tube wall. Using an eigenfunction (higher- order-mode analysis), a four-pole system matrix for evaluating acoustic performance (STL) is derived. To improve the acoustic performance of the expansion chamber muffler, three kinds of expansion chamber mufflers (KA-KC) with different acoustic mechanisms are introduced and optimized for a targeted tone using a genetic algorithm (GA). Before the optimization process is performed, the higher-order-mode mathematical models of three expansion chamber mufflers (A-C) with various allocations of inlets/outlets and various chambers are also confirmed for accuracy. Results reveal that the STL of the expansion chamber mufflers at the targeted tone has been largely improved and the acoustic performance of a reverse expansion chamber muffler is more efficient than that of a straight expansion chamber muffler. Moreover, the STL of the expansion chamber mufflers will increase as the number of the chambers that separate with baffles increases.
    Źródło:
    Archives of Acoustics; 2014, 39, 4; 489-499
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Maximization of an Asymmetric Utility Function by the Least Squares
    Autorzy:
    Yoneda, K.
    Moretti, A. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/375999.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    individual behavior
    inverse problems
    simultaneous equations
    optimization
    Opis:
    This note points out that a utility maximization procedure proposed in an earlier paper may be reduced to the least squares. The utility function is asymmetric in the sense that for each cue its ideal value and the permissible range are assigned in such a way that the ideal is not necessarily at the center of the range, like "a beer of 350 ml would be ideal, but acceptable if within [100, 500]". A practical consequence of the observation is that very little programming will be needed to deploy the utility maximization since software for the least squares is widely available.
    Źródło:
    Decision Making in Manufacturing and Services; 2014, 8, 1-2; 5-12
    1896-8325
    2300-7087
    Pojawia się w:
    Decision Making in Manufacturing and Services
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of an MAP/PH/1 queue with flexible group service
    Autorzy:
    Brugno, A.
    D’Apice, C.
    Dudin, A.
    Manzo, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/330419.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    queueing system
    batch service
    multirate service
    stationary distribution
    optimization
    system kolejkowy
    usługa wsadowa
    usługa wielotaryfowa
    rozkład stacjonarny
    Opis:
    A novel customer batch service discipline for a single server queue is introduced and analyzed. Service to customers is offered in batches of a certain size. If the number of customers in the system at the service completion moment is less than this size, the server does not start the next service until the number of customers in the system reaches this size or a random limitation of the idle time of the server expires, whichever occurs first. Customers arrive according to a Markovian arrival process. An individual customer’s service time has a phase-type distribution. The service time of a batch is defined as the maximum of the individual service times of the customers which form the batch. The dynamics of such a system are described by a multi-dimensional Markov chain. An ergodicity condition for this Markov chain is derived, a stationary probability distribution of the states is computed, and formulas for the main performance measures of the system are provided. The Laplace–Stieltjes transform of the waiting time is obtained. Results are numerically illustrated.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2017, 27, 1; 119-131
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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