Autor: Wang, Z. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Seasonal variations in thermogenesis and energy requirements of plateau pikas Ochotona curzoniae and root voles Microtus oeconomus
Autorzy:: Wang, Z.
Wang, D.
Powiązania:: Acta Theriologica
Opis:: The seasonal patterns of nonshivering thermogeneis (NST), resting metabolic rate (RMR) at 15ºC and 25ºC in plateau pikas Ochotona curzoniae (Hodgson, 1858) and root voles Microtus oeconomus (Pallas, 1776), from the Qinghai-Tibetan plateau, were determined and thermal conductance was calculated. NST tended to increase during cold season for both species.
Dostawca treści:: RCIN - Repozytorium Cyfrowe Instytutów Naukowych

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Skocz do pozycji: 2.

Tytuł:: Sensitivity Analysis for Influence Parameters of Rail Corrugation Characteristics in Metro Straight Section
Autorzy:: Wang, Z.
Lei, Z.
Tematy:: sensitivity analysis
metro
rail corrugation
friction self-excitation
stochastic finite element
analiza wrażliwości
pofałdowanie szyn
samowzbudzenie tarcia
stochastyczny element skończony; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2023447.pdf Link otwiera się w nowym oknie
Opis:: Based on the theory of friction self-excited vibration and the measured data of rail corrugation, the cause of rail corrugation in metro straight section was analyzed. Then, using the stochastic finite element method, the sensitivity of each parameter to rail corrugation was studied by selecting the elastic modulus E1 and density ρ1 of the wheel-rail material, the elastic modulus E2 and density ρ2 of the track slab material, the wheel-rail coefficient of friction f, the fastener vertical stiffness K and vertical damping C, the wheel-rail longitudinal relative slip s as the random parameters. The results show that under the support of Cologne egg fastener track, the characteristic frequency of friction self-excited vibration of wheel-rail system is close to the characteristic frequency of measured corrugation, indicating that the occurrence of rail corrugation is related to the friction self-excited vibration of wheel-rail system under the condition of saturated creep force. The parameter sensitivity analysis illustrates that the influence degree of each random parameter on the real part αi of complex eigenvalue is E1>ρ1>C>E2>ρ2>f>K>s in turn. E1, C and s are positively correlated with the real part αi of complex eigenvalue, while the remaining 5 parameters are negatively correlated with the real part αi of complex eigenvalue. Therefore, appropriate decrease of E1, C and s, and increase of ρ1, E2, ρ2, f and K can play a positive role in the control of rail corrugation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: New ranking method for fuzzy numbers by their expansion center
Autorzy:: Wang, Z.
Zhang-Westmant, L.
Tematy:: curve of the membership function
fuzzy number
horizontal real axis
expansion center
decision making
data analysis
fuzzy environment
geometric intuitivity; Pokaż więcej
Wydawca:: Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Powiązania:: https://bibliotekanauki.pl/articles/91710.pdf Link otwiera się w nowym oknie
Opis:: Based on the area between the curve of the membership function of a fuzzy number and the horizontal real axis, a characteristic as a new numerical index, called the expansion center, for fuzzy numbers is proposed. An intuitive and reasonable ranking method for fuzzy numbers based on this characteristic is also established. The new ranking method is applicable for decision making and data analysis in fuzz environments. An important criterion of the goodness for ranking fuzzy numbers, the geometric intuitivity, is also introduced. It guarantees coinciding with the natural ordering of the real numbers.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Time-dependent Pancharatnam phases and quantum correlations for coupling superconducting two-qubit system with dissipative environment
Autorzy:: Xue, Liyuan
Wang, Z. S.
Tematy:: Pancharatnam phases
quantum concurrence
quantum discord
dissipative environment
Bloch radius; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1835809.pdf Link otwiera się w nowym oknie
Opis:: Two coupling superconducting qubits are studied for the quantum concurrence, discord, and Pancharatnam phase, for the X and Y states under the dephasing and instantaneous decay environment as well as their couplings. We find that the X and Y states are special mixed states according to the Bloch radius. In general, the larger the environment and phonon number are at the larger region of time, the larger the quantum concurrence and discord are. But we find that the environment correlations are helpful to implement the quantum computation. The Pancharatnam phases provide a way to distinguish the X and Y states.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Metabolism and thermoregulation in the Mongolian gerbil Meriones unguiculatus
Autorzy:: Wang, Z.
Wang, Y.
Wang, D.
Powiązania:: Acta Theriologica
Opis:: Oxygen consumption, thermal conductance and body temperature of Meriones unguiculatus (Milne-Edwards, 1867) were measured at a temperature range from 5 to 40°C.
Dostawca treści:: RCIN - Repozytorium Cyfrowe Instytutów Naukowych

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Skocz do pozycji: 6.

Tytuł:: Robust stability of a family of matrices
Autorzy:: Wang, L.
Zhang, L.
Wang, Z.
Tematy:: rezultat wierzchołkowy
rodzina macierzy
stabilność odporności
struktura wieloliniowej niepewności
teoria algebry
algebra theory
matrix families
multilinear uncertainty structure
robust stability
vertex results; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:: https://bibliotekanauki.pl/articles/205534.pdf Link otwiera się w nowym oknie
Opis:: For a family of matrices with multilinear uncertainty structure, stability of the entire matrix family can be guaranteed by stability of its vertex matrices.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Hydrodynamic load and parametric design of grouted clamp used on offshore jacket
Autorzy:: Zhang, B
Wang, Z.
Wang, T.
Tematy:: offshore jacket
grouted clamp
parameterized design
mechanics experiment; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259702.pdf Link otwiera się w nowym oknie
Opis:: The reliability and safety of offshore platform are an important research aspect in marine engineering. The jacket platform is mainly used for oil development and submarine drilling, and the long-term work in the marine environment will be subjected to different loads, which will lead to the damage of the structure part of the offshore platform. It affects the structural strength of the platform. For the repair of jacket damage, grouted reinforcement technology is adopted, which has the advantages of simple underwater installation and low cost. The reinforcement technology of the grout hoop has been applied to the engineering projects abroad, but the stress and serialization design of the hoop in the marine environment need further study. This paper will combine the ocean current and wave force to carry out the research of underwater work and prevent loosening, and put forward the parametric design method for the specific size of the hoop. Two types of experimental models are designed: short bolt form clamp and long bolt form clamp. The mechanical experiment of the long bolt clamp is carried out, and the relationship between the slipping force and the bolt preload is analyzed, so as to verify the theoretical analysis.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Analysis and experiments on sea load and fastened mechanics on pipe clamps
Autorzy:: Wang, Z.
Zhang, B.
Wang, T.
Tematy:: pipe clamps
sea environmental load
fastening mechanics
strength analysis; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/260041.pdf Link otwiera się w nowym oknie
Opis:: When an offshore oil field completed and put into production, new subsea pipelines and the new cable need to be established. Cable protection pipe clamp is used to fix cable protection pipe on the jacket. In order to avoid the problem of traditional steel structure clamp splice, counterpoint, fastening difficulty when installed cable protection pipe under water, reduce the risk and workload of under water, This paper develop a new type of portable connecting riser clamp –“backpack clamp” which solve the riser cable protection pipe difficult underwater installation problem. The main structure of backpack clamp used three valves type structure. The load characteristic of a clamping device was determined by the Morison equation which was a classical theory. Clamp device underwater mechanics analysis model was established. The minimum tension pre-tightening force was determined. The results show that the strength of the base meets the requirements after strength analysis with finite element analysis method, stability and strength experiments, which means the clamp based on resin matrix composite is feasible.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Collocation method based on barycentric interpolation iteration for analysis of nonlinear microbeams
Autorzy:: Zhuang, M.
Miao, C.
Wang, Z.
Tematy:: nonlinear microbeams
barycentric Lagrange interpolation
collocation method
linearization method
iteration method; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/279890.pdf Link otwiera się w nowym oknie
Opis:: A powerful computational methodology, named the barycentric Lagrange interpolation iteration collocation method (BLIICM), for solving nonlinear bending problems of a doubly clamped microbeam under electrostatic loads is presented. The nonlinear governing equation of the microbeam is converted into a linear diﬀerential equation by assuming the initial function. The barycentric Lagrange interpolation collocation method (BLICM) is used to solve the linear diﬀerential equation. The direct linearization formulations and Newton linearization calculation formulations for the nonlinear diﬀerential equation have been given. The calculation method and formulation of the nonlinear integral term have been discussed in details. By applying a barycentric Lagrange interpolation diﬀerential matrix, a matrix-vector calculation formula of BLIICM has been established. Numerical results of calculation examples show that the advantages of the proposed methodology are eﬃcient, simple and of high precision.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Numerical analysis on the influence of the twisted blade on the aerodynamic performance of turbine
Autorzy:: Jin, J.
Wang, Z.
Cao, L.
Tematy:: turbine
twisted blade
leakage vortex
pressure gradient
tip clearance; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/258444.pdf Link otwiera się w nowym oknie
Opis:: With the gradual increase of the thermal power unit capacity, the inlet steam parameters and flow of the turbine also increase gradually, which causes considerable secondary flow loss. Therefore, studying the causes and distribution of secondary flow loss within the level is of great significance to effectively improve the stage internal efficiency of turbine. Take high-pressure stage moving blade of a turbine as the research object, and adopt the k-ωSST model, the SIMPLEC algorithm to numerically simulate the formation and development process of leakage vortex between the tip clearance of the positive bending twisted blade and its effect on the secondary flow of cascade passage. Results show that relative to the conventional twisted blade, the scope of influence of leakage vortex which the steam flow formed near the suction surface of positive bending twisted blade and the disturbance to passage mainstream become smaller, and the increase of tip clearance has weakened the „C” type pressure gradient of suction surface of the positive bending twisted blade, increased the thickness of the boundary layer at both ends of blades and the loss of the blade end.
Dostawca treści:: Biblioteka Nauki

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