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    Wyświetlanie 1-7 z 7
    Tytuł:
    Heating control of heated twin radiosonde humidity sensor based on DMC
    Autorzy:
    Sun, N.
    Zhang, Y.
    Zhang, W
    Cheng, E.
    Liu, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/260018.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    DMC
    twin heated humidity sensor
    expanded responsible curve
    heating control
    Opis:
    In order to effectively solve condensation and icing problems of radiosonde in low-temperature environment at high altitude, humidity sensor heated automatic alternately to remove pollution and improve the measurement accuracy. Heat experiments obtained the curve of rising temperature and responsible time on heated twin humidity sensor in normal temperature and pressure, by expanded responsible curve to obtain heated model of twin heated humidity sensor and by the analysis of heating model, use DMC and PID control for heating respectively. Simulation results show that the DMC control meets the practical requirements of measure at high altitude.
    Źródło:
    Polish Maritime Research; 2016, S 1; 52-58
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of the capillary pressure-saturation pore-size distribution parameter on geological carbon sequestration estimates
    Autorzy:
    Cheng, Ch.-L.
    Perfect, E.
    Yu, T. E.
    Gragg, M. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/91981.pdf
    Data publikacji:
    2017
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    geological carbon sequestration
    numerical modeling
    capillary pressure
    saturation
    cost estimate
    geologiczna sekwestracja węgla
    modelowanie numeryczne
    ciśnienie kapilarne
    nasycenie
    szacowanie kosztów
    Opis:
    Cost estimates for geologic carbon sequestration (GCS) are vital for policy and decision makers evaluating carbon capture and storage strategies. Numerical models are often used in feasibility studies for the different stages of carbon injection and redistribution. Knowledge of the capillary pressure-saturation function for a selected storage rock unit is essential in applications used for simulating multiphase fluid flow and transport. However, the parameters describing these functions (e.g. the van Genuchten m pore size distribution parameter) are often not measured or neglected compared to other physical properties such as porosity and intrinsic permeability. In addition, the use of average instead of point estimates of m for numerical simulations of flow and transport can result in significant errors, especially in the case of coarse-grained sediments and fractured rocks. Such erroneous predictions can pose great risks and challenges to decision-making. We present a comparison of numerical simulation results based on average and point estimates of the van Genuchten m parameter for different porous media. Forward numerical simulations using the STOMP code were employed to illustrate the magnitudes of the differences in carbon sequestration predictions resulting from the use of height-averaged instead of point parameters. The model predictions were converted into cost estimates and the results indicate that varying m values in GCS modeling can cause cost differences of up to hundreds of millions dollars.
    Źródło:
    Journal of Sustainable Mining; 2017, 16, 3; 67-72
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FEM modeling of hard turning with consideration of viscoplastic asymmetry and phase transformation
    Autorzy:
    Uhlmann, E.
    Mahnken, R.
    Ivanov, I. M.
    Cheng, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/99847.pdf
    Data publikacji:
    2013
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    hard turning
    finite element method
    production technology
    process optimization
    Opis:
    A material model for strain rate and temperature dependent asymmetric plastic behavior accompanied by phase transformation induced plasticity (TRIP) as an important phenomenon in steel production and machining processes was developed. To this end the well-known Johnson-Cook flow stress model has been extended by the concept of weighting functions considering the asymmetric plastic material behavior under tensile, compressive and torsion load. Furthermore, the extended Johnson-Cook model has been combined with the Leblond approach regarding the ductility increase by transformation induced plasticity occurring during hard turning of AISI 52100. On the basis of the theoretical approach for calculating the flow stress with consideration of the viscoplastic asymmetry, a material routine for the FEM-software DEFORM has been implemented. The material and friction model coefficients have been determined in accordance with force and surface temperature measurements during hard turning of AISI 52100. The model takes the phase transformations between martensite and austenite and the influence of externally applied stress on the austenite start temperature into account.
    Źródło:
    Journal of Machine Engineering; 2013, 13, 1; 80-92
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of oxidation on the wetting of coal surfaces by water: experimental and molecular dynamics simulation studies
    Autorzy:
    Li, E.
    Lu, Y.
    Cheng, F.
    Wang, X.
    Miller, J. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/109792.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    wettability
    oxidation
    molecular dynamics simulation
    hydrogen bonding
    contact angles
    coal surfaces
    Opis:
    The wettability of coal surfaces by water continues to be one of the key factors which determines the success of coal flotation. Consequently, oxidation of coal surfaces is a fundamental issue of interest. In this work, the effect of oxidation on the wetting of coal surfaces and the interaction between water molecules and oxygen-containing sites at the coal surface was investigated based on advancing/receding contact angle measurements and molecular dynamics simulations. For the simulation studies, a flat coal surface was constructed with the assistance of the molecular repulsion between graphite surfaces and the assembly of Wiser coal molecules. Our results indicated that the simulated advancing and receding contact angles were very similar, and both of them decreased, as expected, with an increase of hydroxyl sites at the coal surface. The good agreement between the simulated advancing/receding contact angles and the experimental receding contact angle values suggested that the configuration of the systems and the set of parameters for the simulation were appropriate. The spreading of water is mainly due to the hydrogen bonds formed between the interfacial water molecules and the hydroxyl sites at the coal surface. The hydroxyl groups show stronger hydration capacity than other oxygen-containing groups according to the calculated hydrogen bonds and interaction energies.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1039-1051
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Batch scheduling of deteriorating products
    Autorzy:
    Barketau, M. S.
    Cheng, T. C. E.
    Kovalyov, M. Y.
    Ng, C. T. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/375908.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    scheduling
    batching
    remanufacturing
    deterioration
    Opis:
    In this paper we consider the problem of scheduling N jobs on a single machine, where the jobs are processed in batches and the processing time of each job is a simple linear increasing function depending on job's waiting time, which is the time between the start of the processing of the batch to which the job belongs and the start of the processing of the job. Each batch starts from the setup time S. Jobs which are assigned to the batch are being prepared for the processing during time S0 < S. After this preparation they are ready to be processed one by one. The non-negative number bi is associated with job i. The processing time of the i-th job is equal to bi(si - (si(b) + S0)), where si(b) and si are the starting time of the b-th batch to which the i-th job belongs and the starting time of this job, respectively. The objective is to minimize the completion time of the last job. We show that the problem is NP-hard. After that we present an O(N) time algorithm solving the problem optimally for the case bi = b. We further present an O(N2) time approximation algorithm with a performance guarantee 2.
    Źródło:
    Decision Making in Manufacturing and Services; 2007, 1, 1-2; 25-34
    1896-8325
    2300-7087
    Pojawia się w:
    Decision Making in Manufacturing and Services
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First-Principles Calculations for Structural, Elastic, Electronic and Thermodynamic Properties of $HfZn_{2}$ under Pressure
    Autorzy:
    Li, Guo-Jun
    Shi, Lan-Ting
    Hu, Cui-E
    Cheng, Yan
    Ji, Guang-Fu
    Powiązania:
    https://bibliotekanauki.pl/articles/1398192.pdf
    Data publikacji:
    2018-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    C15 Laves-phase
    elastic properties
    electronic structure
    vibrational properties
    quasi-harmonic approximation
    Opis:
    By using density functional theory within the Perdew-Burke-Ernzerhof generalized gradient approximation implemented in the VASP code, we study the structural, elastic, electronic, and thermodynamic properties of C15 Laves-phase compound $HfZn_{2}$. Comparing the lattice constants calculated from the Perdew-Burke-Ernzerhof generalized gradient approximation and local density approximation, we find that the former is in better agreement with the experimental data. The elastic constants of $HfZn_{2}$ calculated by strain-stress method indicate that they keep stable up to 100 GPa. The bonding characteristics are discussed by analyzing the energy band structure, charge density distribution and charge density difference. Phonon dispersion curves and phonon density of states of HfZn_{2} at the different pressure are predicted for the first time. In addition, there is no imaginary frequency in the phonon band at different pressure, which also shows that $HfZn_{2}$ is stable up to 100 GPa. Vibrational models are also illustrated based on phonon and group theory. The thermodynamic properties under high temperature and high pressure are calculated by different thermodynamic models. The heat capacity at constant pressure and low temperature calculated by quasi-harmonic approximation is more close to the measurement than that calculated by quasi-harmonic Debye models.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 5; 1299-1306
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tunnelling of Direct and Indirect Excitons in Slightly Asymmetric Double Quantum Wells
    Autorzy:
    Mazurenko, D. A.
    Akimov, A. V.
    Moskalenko, E. S.
    Zhmodikov, A. L.
    Kaplyanskii, A. A.
    Challis, L. J.
    Cheng, T. S.
    Foxon, C. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952066.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Dx
    63.20.Kr
    Opis:
    We report the first studies of luminescence spectra from asymmetric double quantum wells of GaAs with widths around 100 Å differing by only one (2.8 Å) or two monolayers. Studies of the position and intensity of the direct and indirect exciton lines suggest the existence of acoustic phonon-assisted tunnelling between exciton states separated by a few meV. At temperatures 10-20 K the electron tunnelling process is fast enough to maintain thermal equilibrium between these direct and indirect excitons which are connected with holes in the same quantum well.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 895-898
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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