Autor: Chen, Zhao - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: A modified Fourier-Ritz method for free vibration of rectangular plates with elastic constrains
Autorzy:: Wu, Tao
Chen, Zhao Bo
Qu, Jian Jun
Tematy:: modified Fourier-Ritz method
rectangular plate
free vibration
boundary conditions; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/2086961.pdf Link otwiera się w nowym oknie
Opis:: In this paper, a modified Fourier-Ritz method is used to study free vibration of a rectangular plate with a set of simply supported opposite sides and another set of arbitrary elastic constraints. The influence of different elastic constraint stiffness values on the modal response of the rectangular plate is also analyzed. In order to avoid that the displacement function of the rectangular plate calculated by the traditional method and its derivative may be discontinuous or non-derivable at the boundary, the displacement function is expressed in the form of the sum of standard cosine series and a periodic polynomial function. Compared with the sine series expansion, the convergence of the result is enhanced. Several sets of numerical examples with different boundary conditions are given in the article, the data shows that the results calculated by this method have good accuracy and fast convergence. In addition, this paper also analyzes the boundary conditions and discusses the influence of different spring stiffness values on the setting of boundary conditions. The results can be applied to the setting of general boundary conditions and the study of vibration control of rectangular plates.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Electrical neutralization ability of polyaluminum chloride (PACl) coagulants with different OH–/Al3+ ratios by fluorescence quenching effect
Autorzy:: Chi, Fung Hwa
Cheng, Wen Po
Yu, Ruey Fang
Chen, Zhao Feng
Tematy:: stała Sterna-Volmera
polichlorek glinu
kwas humusowy
fluorescencja
Stern-Volmer constant
polyaluminum chloride
humic acid
fluorescence; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/207968.pdf Link otwiera się w nowym oknie
Opis:: The electrical neutralization ability of polyaluminum chlorides (PACls) with respect to humic acid was investigated by the fluorescence quenching method. The Stern–Volmer constant (K_q) at various pH and coagulation doses was determined for polyaluminum chlorides (PACl-B) of various basicities (B, B = [OH^–]/[Al]). The experimental results show that under acidic conditions, the order of K_qvalues of PACl-B is PACl-2.5 > PACl-2.3 > PACl-1.5 > AlCl₃. In solutions of pH = 7, the order of K_qvalues is PACl-1.5 > PACl-2.3 > PACl-2.5 > AlCl3. When pH > 7, aluminum ions are rapidly hydrolyzed, thus PACls of various basicities generally do not show capacity for electrical neutralization with humic acid. At pH = 6, all PACls-B obtain the maximum K_q values, indicating that humic acid and PACl-Bcoagulation process is less affected by H⁺ or OH^– ions, and produces the best electrical neutralization ability. Compared to the past method of using surface potential as a means of determining the ability of neutralization of coagulation, the results of this study show that the K_q value of the quenching effect can reduce the experiment complexity.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: An adaptive method based on PC-Kriging for system reliability analysis of truss structures
Autorzy:: Chen, Pengyu
Zhao, Cunbao
Yao, He
Zhao, Shengnan
Tematy:: trade-off
truss structures
system reliability analysis
global metamodel
local metamodel
representative failure modes; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Powiązania:: https://bibliotekanauki.pl/articles/27312783.pdf Link otwiera się w nowym oknie
Opis:: In practice, a truss consists of a large number of members which makes it a complex system. This leads to difficulties to estimate the system reliability due to computational costs. An adaptive method is thereby proposed to deal with this issue. It constructs a global metamodel to quickly estimate the rough reliability index of a truss. According to the estimated reliability index, the differential evolution algorithm is performed to generate more samples located in an expanded domain so that more representative failure modes can be identified. Combined with AK-SYSi, local metamodels of representative failure mods are built, and updated through active learning. When the convergence criterion is satisfied, the results of system reliability analysis can be obtained. Eventually, two examples of truss structures are studied to illustrate the superiority of the proposed method in balancing accuracy and efficiency. The results indicate that the proposed method makes a good balance between accuracy and efficiency when it is applied to analyze the system reliability of the truss.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Generalized Stokes parameters of random electromagnetic quasi-homogeneous beams on propagation
Autorzy:: Chen, J
Xin, Y
Chen, Y
Chen, F
Zhao, Q
Tematy:: electromagnetic
quasi-homogeneous
generalized Stokes parameters
polarization; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174819.pdf Link otwiera się w nowym oknie
Opis:: The expressions for the elements of the on-axis and transverse generalized Stokes parameters of random electromagnetic quasi-homogeneous beams on propagation are presented and are used to study the polarization properties of the beams. Some typical numerical calculations of the on-axis and transverse Stokes parameters, polarization properties of the beams on propagation are illustrated. The results show that for different sources all the on-axis parameters are identical in the near field and keep fixed values in the far field. But the transverse parameters are affected greatly by the properties of the source even in the near field. We have also found that the spatial profiles of the transverse parameters remain unchanged upon propagation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Optical generation of ultra-wideband signals with a reconfigurable spectral notch-band
Autorzy:: Xiang, P.
Chen, Y.
Chen, D.
Zhao, J.
Tematy:: ultra-wideband (UWB)
ultra-wideband over fiber
notch-band
interference avoidance; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174353.pdf Link otwiera się w nowym oknie
Opis:: A novel method for optical generation of ultra-wideband signals with a reconfigurable spectral notch-band is proposed. In the proposed system, ultra-wideband signals are generated in the optical domain and an optical tunable delay line is deployed to introduce a notch-band to the spectral profile of the generated ultra-wideband signals, which can effectively avoid the signal interference between ultra-wideband signals and pre-planned narrowband wireless signals used in wireless local area networks (WLAN). A theoretical model describing the proposed system is derived; the optical generation and fiber transmission of ultra-wideband signals with a reconfigurable notch-band are demonstrated via computer simulations.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: 2D Structural Acoustic Analysis Using the FEM/FMBEM with Different Coupled Element Types
Autorzy:: Chen, L.
Zhao, W.
Liu, C.
Chen, H.
Tematy:: boundary element method
finite element method
discontinuous boundary elements
acoustic fluid-structure interaction
fast multipole method; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/176330.pdf Link otwiera się w nowym oknie
Opis:: A FEM-BEM coupling approach is used for acoustic fluid-structure interaction analysis. The FEM is used to model the structure and the BEM is used to model the exterior acoustic domain. The aim of this work is to improve the computational efficiency and accuracy of the conventional FEM-BEM coupling approach. The fast multipole method (FMM) is applied to accelerating the matrix-vector products in BEM. The Burton-Miller formulation is used to overcome the fictitious eigen-frequency problem when using a single Helmholtz boundary integral equation for exterior acoustic problems. The continuous higher order boundary elements and discontinuous higher order boundary elements for 2D problem are developed in this work to achieve higher accuracy in the coupling analysis. The performance for coupled element types is compared via a simple example with analytical solution, and the optimal element type is obtained. Numerical examples are presented to show the relative errors of different coupled element types.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Study on the mechanics and micro/macroeconomics of multiple strip-shaped pillar recovery
Autorzy:: Chen, Qingfa
Wu, Shiwei
Zhao, Fuyu
Tematy:: mechanika
szalunek kopalni
bezpieczeństwo kopalni
multiple strip-shaped pillars
recovery
mechanics
macroeconomic; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/219858.pdf Link otwiera się w nowym oknie
Opis:: The structural system of a multiple strip-shaped pillar-roof is common in underground mine exploitation, and research on its mechanics and micro/macroeconomics is meaningful for utilizing strip-shaped pillar resources. A general model of the structural system of a multiple strip-shaped pillar-roof was established, the deformation mechanism of the model was analysed by material mechanics, and the deflection curve equations of the model were obtained. Based on the stress strain constitutive relation of the strip pillar and cusp catastrophe theory, the nonlinear dynamic instability mechanism of the structural system of a multiple strip-shaped pillar-roof was analysed, and the expressions of the pillar width for maintaining the stability of different types of structural systems were derived. The benefits of different structural systems were calculated using micro/macroeconomic theory, the type of the structural system was determined, and different recovery schemes were obtained. Theoretical application research was applied to a large manganese mine, and the results demonstrate that no pillar recovery was needed in 2016, a 9-m wide artificial pillar could be built to replace a pillar in 2017, and the construction of 14-m wide artificial pillars can be conducted in 2018.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Study on Sustainable Development Model of Community Renewal based on the Green Development Model
Autorzy:: Zhao, Minting
Ge, Teng
Chen, Dan
Tematy:: economy
community
ecological environment
coordinated development; Pokaż więcej
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Powiązania:: https://bibliotekanauki.pl/articles/58907725.pdf Link otwiera się w nowym oknie
Opis:: The community is an important part of the city. With the city's development, it is faced with the problem of renewal and reconstruction of the old community. It is necessary to explore the sustainable development of the community. In this paper, evaluation and analysis of the coordinated development of the ecological environment and economy of the community are studied. The indicators were selected appropriately to reflect the SE and EE development status comprehensively. The results show that Nanjing, Wuhan and Xi'an take the top spot in terms of CCD, meaning it has the most harmonious relationship between the social-economic subsystem and eco-environment subsystem; Xi'an has the highest SE value, while Lianyungang has the lowest evaluation result. Nanjing has the highest EE value, indicating it has the best eco-environment development, while Suqian has the worst. This study provides a scientific basis and effective measures for sustainable development in China.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Isogeometric Fast Multipole Boundary Element Method Based on Burton-Miller Formulation for 3D Acoustic Problems
Autorzy:: Chen, Leilei
Zhao, Wenchang
Liu, Cheng
Chen, Haibo
Marburg, Steffen
Tematy:: isogeometric analysis
boundary element method
Burton-Miller method
acoustic scattering
fast multipole method; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/177486.pdf Link otwiera się w nowym oknie
Opis:: An isogeometric boundary element method is applied to simulate wave scattering problems governed by the Helmholtz equation. The NURBS (non-uniform rational B-splines) widely used in the CAD (computer aided design) field is applied to represent the geometric model and approximate physical field variables. The Burton-Miller formulation is used to overcome the fictitious frequency problem when using a single Helmholtz boundary integral equation for exterior boundary-value problems. The singular integrals existing in Burton-Miller formulation are evaluated directly and accurately using Hadamard’s finite part integration. Fast multipole method is applied to accelerate the solution of the system of equations. It is demonstrated that the isogeometric boundary element method based on NURBS performs better than the conventional approach based on Lagrange basis functions in terms of accuracy, and the use of the fast multipole method both retains the accuracy for isogeometric boundary element method and reduces the computational cost.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Smarter way to build: volumetric modular construction system
Wolumetryczny modułowy system budowania jako odpowiedź na współczesne wyzwania budownictwa
Autorzy:: Wozniak-Szpakiewicz, E.
Zhao, S.
Chen, T.
Tematy:: volumetric modular construction
modular construction
off-site
assembled architecture
permanent modular architecture
wolumetryczne budownictwo modułowe
prefabrykacja
budownictwo modułowe
architektura; Pokaż więcej
Wydawca:: Politechnika Krakowska im. Tadeusza Kościuszki. Wydział Architektury. Katedra Kształtowania Środowiska Mieszkaniowego
Powiązania:: https://bibliotekanauki.pl/articles/345471.pdf Link otwiera się w nowym oknie
Opis:: The article deals with the problem of increasing demand for modular buildings as an answer to the construction industry’s current situation and challenges of build environment. The case studies refer to the hospitality and student living sector. The author addresses the following question regarding the near future of the modular construction industry: How would it reflect on urban space, living space and the whole attitude toward modular construction issues? What is the role of the architect during the design-build process? Is it possible to make references to “beauty” in a modular construction context?
Artykuł podejmuje problematykę rosnącego popytu i zapotrzebowania na realizację obiektów w oparciu o wolumetryczną technologię modułową jako odpowiedź na potrzeby zrównoważonego rozwoju. Jako przykłady wskazuje autor wskazuje obiekty hotelowe i obiekty zamieszkania studenckiego. Autor stawia pytanie o przyszłość budownictwa modułowego. Jaki wpływ będzie ono miało na kształtowanie przestrzeni miejskiej i na przestrzeń życiową? Jaka jest rola architekta podczas procesu zaprojektuj-wybuduj? Czy możliwe jest odniesienie wartości „piękna” do rozwiązań w systemie modułowym?
Dostawca treści:: Biblioteka Nauki

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