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    Wyświetlanie 1-12 z 12
    Tytuł:
    Determination of the calcium sulfate hemihydrate content by regression analysis using the initial setting time
    Autorzy:
    Li, Bing
    Powiązania:
    https://bibliotekanauki.pl/articles/231074.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gips
    modyfikacja
    czas wiązania
    analiza regresji
    hemihydrat siarczanu wapnia
    gypsum
    modification
    setting time
    regression analysis
    calcium sulfate hemihydrate
    Opis:
    In this paper, we randomly select 75 sets data of calcium sulfate hemihydrate (CSH) content and initial setting time, and the traditional test method of CSH and analyses initial setting time was used by complexometric titration. So the close relationship between them was studied in depth, which classification fitting data to be analyzed by regression analysis. The result shows that this regression analysis method can accurately determine CSH content in modified industrial by-product gypsum. The determination method has the advantages of simplification and rapid operation. As well as, the XRF quantitative analytical method was used to test the CSH content, which verified the accuracy of regression analysis method. The results also show that this method has high accuracy, and can simplify the traditional experimental process. The method developed is easier and more convenient and has broad prospects in application.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 2; 421-437
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anti-periodic solutions for Clifford-valued high-order Hopfield neural networks with state-dependent and leakage delays
    Autorzy:
    Huo, Nina
    Li, Bing
    Li, Yongkun
    Powiązania:
    https://bibliotekanauki.pl/articles/330171.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    Hopfield neural network
    anti-periodic solution
    coincidence degree
    time-varying delay
    sieć neuronowa Hopfielda
    stopień koincydencji
    opóźnienie czasowo zależne
    Opis:
    A class of Clifford-valued high-order Hopfield neural networks (HHNNs) with state-dependent and leakage delays is considered. First, by using a continuation theorem of coincidence degree theory and the Wirtinger inequality, we obtain the existence of anti-periodic solutions of the networks considered. Then, by using the proof by contradiction, we obtain the global exponential stability of the anti-periodic solutions. Finally, two numerical examples are given to illustrate the feasibility of our results.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2020, 30, 1; 83-98
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the Performance Optimization of Turbulent Self-Noise Suppression and Sound Transmission of Acoustic Windows Made from Functionally Graded Material
    Autorzy:
    Li, Bing
    Zhou, Fu-Lin
    Fan, Jun
    Wang, Bin
    Tan, Liwen
    Powiązania:
    https://bibliotekanauki.pl/articles/31339793.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    functionally graded material
    acoustic window
    turbulent self-noise
    sound transmission loss
    optimization
    Opis:
    For a simplified sonar dome model, an optimization method for internal gradients of functionally graded material (FGM) acoustic windows is proposed in this paper. This method can be used to design optimized FGM acoustic windows with better turbulent self-noise suppression and sound transmission performances. A theoretical model of FGM acoustic windows to evaluate the reduction of self-noise caused by the turbulent boundary layer (TBL) pulsating pressure and the sound transmission loss (STL) is derived through the double Fourier transform and the wavenumber frequency spectrum analysis, respectively, based on the transfer matrix idea and the classical elastic theory. The accuracy of the theory is verified by the finite element results of COMSOL Multiphysics. Utilizing the genetic algorithm (GA) and taking the monotonic gradient as the constraint condition, the internal gradient optimization method of FGM acoustic windows obtains the optimization variables in the Bernstein polynomial when the optimization objective is minimized by iterating the optimization variables in the deviation function represented by the Bernstein polynomial that is introduced in the gradient function. The STL, the turbulent self-noise reduction or a weighting function of the STL and turbulent self-noise reduction of FGM acoustic windows is chosen as the optimization objective. The optimization calculation of the sound transmission or turbulent self-noise suppression performances is carried out for the FRP-rubber FGM (FGM with fiber reinforced plastic (FRP) as the substrate material and rubber as the top material) acoustic window. The optimized results show that both the sound transmission and turbulent self-noise suppression performance are effectively improved, which verifies the effectiveness of the optimization method. Finally, the mechanism of the sound transmission and self-noise suppression characteristics before and after optimization are explained and analyzed based on the equivalent model of graded materials. The research results of this paper provide a reference value for the future design of FGM acoustic windows for sonar domes.
    Źródło:
    Archives of Acoustics; 2023, 48, 4; 475-495
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation into the growgth directions of a ductile crack under tensile loading
    Autorzy:
    Zhang, Xiao--Bing
    Li, Jia
    Recho, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/279697.pdf
    Data publikacji:
    1999
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    fracture
    full elastic--plastic field
    crack propagation criteria
    Opis:
    In this paper, we use an energy variational methodto study the full stress field near a stationary crack in a plane state in a power--law hardening material under mode I liading. Associated with the finite element method the trejectory line fields of the principal stresses and the maximum shear stresses have been drawn in order to determine the crack growth direction. It appears that the crack can propagate along a cleavage band or along a slip band according to the triaxial tensile stress level in the vicnity of the crack. The growth direction of a ductile crack depends on the competition between the stress concentractions along these bands.
    W pracy zastosowano metodę wariacji energii do badania pełnego pola naprężeń wokół stacjonarnego pęknięcia w płaski stanie odkształcenia dla materiału o potęgowym wzmocnieniu dla I typu obciążenia. Przy pomocy metody elementów skończonych wyznaczono pola trajektorii naprężeń głównych i maksymalnych naprężeń ścinających w celu określenia kierunku wzrostu szczeliny. Stwierdzono, iż pęknięcie rozwija się wzdłuż pasm rozdzielczości lub pasm ścinania, zgodnie z poziomem trójosiowych naprężeń rozciągających w otoczeniu pęknięcia. Kierunek wzrostu pęknięcia ciągliwego zależy od relacji pomiędzy koncentracjami naprężeń wzdłuż tych pasm.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 1999, 4; 779-789
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation and measurement of tide height for the navigation of ship at high tide using artificial neural network
    Autorzy:
    Li, Q.
    Bing-Dong, Y.
    Bi-Guang, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/258480.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    deep-draft ships
    neural network
    intelligent navigation
    multi-observation stations
    Opis:
    Accurate tide height is crucial for the safe navigation of large deep-draft ships when they enter and leave the port. We have proposed an accurate forecasting method for the tide heights from the observation data and neural networks, which can easily calculate the tidal window period of large deep-draft ships’ navigation through long channels at high tide. Moreover, an artificial neural network is established for the tide height from the observation of tide heights before their current time node. For an ideal forecast, the neural network was optimized for one year with the tide height data of Huanghua Port. In case of large ships, their tidal characteristics of channels for are complex. A new method is proposed for the observation of multiple stations and artificial neural networks of each observation station. When ships are navigating through the port, the tide height is predicted from the observed data and forecast tide heights of multiple observation stations. Thus, a valid tidal window period is secured when the ships enter the port. Comparative analysis of the ship’s tidal window period with that of the measured one can lead us to conclude that the forecasted data has a strong correlation with the measurement. So, our proposed algorithm can accurately predict the tide height and calculate the node timing when the ship enters and depart the port. Finally, these results can be applied for the safe navigation of large deep-draft ships when the port is at high tide.
    Źródło:
    Polish Maritime Research; 2018, S 3; 99-110
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study of digital transformation and MSMEs performance from a spatial perspective: Evidence from China
    Autorzy:
    Zheng, Bing
    Yuan, Yuqing
    Li, Huizhuan
    Jiang, Yihan
    Powiązania:
    https://bibliotekanauki.pl/articles/18721474.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Ekonomiczny w Katowicach
    Tematy:
    digital transformation
    double sampling frame
    performance analysis
    MSMEs
    Opis:
    Aim/purpose – Not only have micro, small, and medium enterprises (MSMEs) been regarded as a driving force of the national economy, but they have also become important in promoting innovation and entrepreneurship. In general, today’s MSMEs face problems, such as high business costs, insufficient innovation, and inadequate management capabilities, that have all forced the digital transformation of MSMEs. However, in existing studies, the impact of digital transformation on performance is controversial, and the subjects are generally listed companies. In this paper, we have decided to use micro business survey data and analyze them from a spatial perspective to explore how MSMEs’ digital transformation plays a role in influencing performance and the path of its effect. Design/methodology/approach – We use a sampling method with a dual directory-regional sampling frame to investigate MSMEs in Ningbo City, Zhejiang Province, China and then delve into the impact of digital transformation on enterprise performance from a spatial perspective by the spatial weighted logit model. Findings – Hierarchical analysis shows that there is a large room for improvement in the Digital transformation of enterprises. The digitalization level of an enterprise has a positive impact on performance. While from a spatial perspective, the digitalization level of neighboring enterprises has a negative impact on the performance of the enterprise. Path analysis shows that the digital transformation of enterprises can increase innovation, reduce costs, and improve the performance of enterprises. Originality/value – We provide an empirical basis for vigorously promoting the digital transformation of enterprises, jointly building digital parks, and improving enterprise performance by reducing costs and improving efficiency. At the same time, it provides relevant suggestions for digital transformation for manufacturing MSMEs that are hesitant to see or are at a loss in the digital transformation and helps manufacturing MSMEs to achieve cost reduction and increase efficiency.
    Źródło:
    Journal of Economics and Management; 2023, 45; 319-343
    1732-1948
    Pojawia się w:
    Journal of Economics and Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flow field characteristic analysis of cushion system of partial air cushion support catamaran in regular waves
    Autorzy:
    Yang, Jinglei
    Sun, Han-bing
    Li, Xiao-wen
    Liu, Xin
    Powiązania:
    https://bibliotekanauki.pl/articles/32910719.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    regular waves
    partial air cushion support catamaran (PACSCAT)
    cushion system
    fluid structure interaction (FSI)
    flow field characteristics
    Opis:
    In order to study the flow field characteristics of cushion system of partial air cushion support catamaran (PACSCAT) in waves, an analysis was carried out involving flexible treatment on the bow and stern air seals to simulate air seal shape under test conditions by means of computational fluid dynamics method and fluid structure interaction (FSI) method. On this basis, the pressure conditions of the air cushion chamber and the pressurized chamber at different wavelengths and different speeds are studied and compared with experimental results. The experimental results show that: for the air cushion pressure, the nonlinear characteristics of the numerical calculation results are more subtle than the experimental values, after linear transformation, the amplitudes of the experimental values are obviously greater than the calculated values after linear transformation, but the average values are not much different; At low speed of 2.0m/s, the spatial pressure distribution of the pressurized chamber and the air cushion chamber are uniformly distributed, at high speed of 3.6m/s, except for a certain pressure jump occurred in the air cushion chamber near the stern air seal, the pressure in other spaces is also evenly distributed, it proves that the pressurized chamber type of air intake can effectively meet the air cushion pressure balance.
    Źródło:
    Polish Maritime Research; 2022, 3; 21-32
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy Analysis of Cavitation Bubbles Under Dual-Frequency Acoustic Excitation
    Autorzy:
    Lv, Liang
    Hu, Kai
    Liu, Fei
    Li, Yawei
    Cui, Bing
    Powiązania:
    https://bibliotekanauki.pl/articles/31339947.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    dual-frequency acoustic excitation
    power
    sonoluminescence
    sonochemistry
    Opis:
    Cavitation has been widely used in wastewater degradation, material synthesis and biomedical field under dual-frequency acoustic excitation. The applications of cavitation are closely related to the power (i.e. the rate of internal energy accumulation) during bubble collapse. The Keller–Miksis equation considering liquid viscosity, surface tension and liquid compressibility is used to describe the radial motion of the bubble. The model is built in predicting the power during bubble collapse under dual-frequency acoustic excitation. The influences of parameters (i.e. phase difference, frequency difference, and amplitude ratio) on the power are investigated numerically. With the increase of phase difference, the power can be fluctuated in a wide range at all conditions. Three typical characteristics of the power appear under the effects of frequency difference and amplitude ratio. With the increase of amplitude ratio, if the frequency difference is small, the power has two maximum values; and if the frequency difference is medium, there is a maximum value. Otherwise, the power monotonously decreases. The results can provide theoretical references for the selections of experimental parameters of sonoluminescence and sonochemistry in the dual-frequency acoustic field.
    Źródło:
    Archives of Acoustics; 2022, 47, 4; 513-518
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Normal Mode Solutions of Target Strengths of Solid-filled Spherical Shells and Discussion of Influence Parameters
    Autorzy:
    Jia, Bing
    Fan, Jun
    Li, Gui-Juan
    Wang, Bin
    Chen, Yun-Fei
    Powiązania:
    https://bibliotekanauki.pl/articles/31339751.pdf
    Data publikacji:
    2024
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    solid-filled spherical shell
    room temperature vulcanized silicone rubber
    target strength enhancement
    Opis:
    The normal mode solution for the form function and target strength (TS) of a solid-filled spherical shell is derived. The calculation results of the spherical shell’s acoustic TS are in good agreement with the results of the finite element method (FEM). Based on these normal mode solutions, the influences of parameters such as the material, radius, and thickness of the inner and outer shells on the TS of a solid-filled spherical shell are analyzed. An underwater spherical shell scatterer is designed, which uses room temperature vulcanized (RTV) silicone rubber as a solid filling material and does not contain a suspension structure inside. The scatterer has a good TS enhancement effect.
    Źródło:
    Archives of Acoustics; 2024, 49, 1; 83-93
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of progressive collapse of a super-long span latticed steel arch structure
    Autorzy:
    Guo, Shuangchao
    Xu, Delin
    Shang, Kaiguang
    Yang, Shuo
    Wang, Di
    Li, Gen
    Zheng, Bing
    Jiao, Yong
    Powiązania:
    https://bibliotekanauki.pl/articles/2200875.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    progressive collapse
    steel arch truss structure
    compression instability
    Opis:
    The progressive collapse of a space grid structure which has a large number of members and a large span is the focus of current research. Before the progressive collapse of the structure, there is a problem of instability of the members. In this paper, dynamic nonlinear analysis of a super-long span latticed steel arch structure is carried out to study its progressive collapse process using a Kinematic Hardening Plasticity constitutive model compiled by Vumat material subprogram in Abaqus, which takes into account instability of the members. Differences in the dynamic response process of the structure at the collapse moment and the failure sequence of the members using the member stability model and the material failure constitutive model are compared. Compared with the material failure constitutive model, when the member stability constitutive model is used, the proportion of compressive buckling members in the structural failure is higher, and the bearing capacity of the structure is lower when the initial failure occurs. The structure suffers from localized member compressive failure rather than material yielding, which leads to the progressive collapse of the structure.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2023, 61, 1; 103--117
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the Mechanical and Thermal Properties, and Impact Sensitivity of Pressed HMX-based PBX
    Autorzy:
    Li, Yuxiang
    Wu, Peng
    Hua, Cheng
    Wang, Jun
    Huang, Bing
    Chen, Jin
    Qiao, Zhiqiang
    Yang, Guangcheng
    Powiązania:
    https://bibliotekanauki.pl/articles/358006.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    nanoexplosives
    impact sensitivity
    particle size
    hot spot
    Opis:
    Submicron- and nano-explosives have attracted growing attention, while the mechanism of how particle size influences the impact sensitivity is not completely understood. In the present work, HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine) based PBXs (plastic bonded explosives) of three particle size distributions (1-2 and 10-20 μm, and 100-300 nm) and two pressed densities (91%TMD and 79%TMD) were characterized and tested with a range of techniques to determine their mechanical and thermal properties and impact sensitivities. The results demonstrated that with decreased particle size, the mechanical strength as well as the thermal conductivity were dramatically improved, and the impact sensitivity was significant decreased. The structure of impacted samples suggested that the ignition mechanism is dependant on the particle size. Samples with higher density were more sensitive to impact, as the impact force acting on these samples was higher. The correlation between particle size and impact sensitivity is discussed in detail.
    Źródło:
    Central European Journal of Energetic Materials; 2019, 16, 2; 295-315
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isolation and expression pattern of RGS21 gene, a novel RGS member
    Autorzy:
    Li, Xin
    Chen, Lei
    Ji, Chaoneng
    Liu, Bing
    Gu, Jiefeng
    Xu, Jian
    Zou, Xianqiong
    Gu, Shaohua
    Mao, Yumin
    Powiązania:
    https://bibliotekanauki.pl/articles/1041351.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    RGS21
    G-protein signaling pathway
    G-protein α subunit (Gα)
    Opis:
    Regulators of G-protein signaling (RGS) proteins are known for the RGS domain that is composed of a conserved stretch of 120 amino acids, which binds directly to activated G-protein α subunits and acts as a GTPase-activating protein (GAP), leading to their deactivation and termination of downstream signals. In this study, a novel human RGS cDNA (RGS21), 1795 bp long and encoding a 152-amino acid polypeptide, was isolated by large-scale sequencing analysis of a human fetal brain cDNA library. Unlike other RGS family members, RGS21 gene has no additional domain/motif and may represent the smallest known member of RGS family. It may belong to the B/R4 subfamily, which suggests that it may serve exclusively as a negative regulator of αi/o family members and/or αq/11. PCR analysis showed that RGS21 mRNA was expressed ubiquitously in the 16 tissues examined, implying general physiological roles.
    Źródło:
    Acta Biochimica Polonica; 2005, 52, 4; 943-946
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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