Skocz do pozycji: 1.

Tytuł:

Biofuel’s Sustainable Development under the Trilemma of Energy, Environment and Economy
Zrównoważoność biopaliw w kontekście triady energia, środowisko i ekonomia

Autorzy:

Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/371479.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN

Tematy:

energy crops
environmental governance
industrial upgrades
sustainability
biofuel policy
rośliny energetyczne
zarządzanie środowiskowe
innowacje przemysłowe
zrównoważoność
polityka biopaliwowa

Opis:

Biofuel helps to overcome energy shortages, and to improve the environment, as well as to increase job opportunity. So, on the one hand, biofuel solves the above mentioned problems; on the other hand, it brings new challenges to the fields of energy, environment and economy. The development of biofuel not only needs technological support, but also needs policy guidance. The paper discusses government’s policy to support biofuel’s development in a sustainable way.
Biopaliwa pomagają przezwyciężyć niedobory energii, przyczyniają się do poprawy stanu środowiska, a także do zwiększenia możliwości podjęcia pracy. Tak więc z jednej strony biopaliwa przynoszą konkretne korzyści, z drugiej związane są nimi nowe problemy w kontekście energii, środowiska i ekonomii. Rozwój biopaliw potrzebuje nie tylko wsparcia technologicznego, ale także odpowiedniego zarzadzania. W artykule omówiono w jaki sposób rządy mogą wspierać rozwój biopaliw w zrównoważony sposób.

Źródło:

Problemy Ekorozwoju; 2015, 10, 1; 55-59
1895-6912

Pojawia się w:

Problemy Ekorozwoju

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Passive localization for mixed-field moving sources

Autorzy:

Gao, C.
Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/258748.pdf

Data publikacji:

2018

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

underwater positioning
passive localization
mixed-field sources
MUSIC algorithm

Opis:

Due to the mobility of underwater equipment, high-precision underwater positioning technology will face two technical challenges: dealing with mixed-field signals composed of near-field signals and far-field signals; adapting to variable component of mixed-field signals considering the mobility of equipment. Under this condition, an effective method based on MUSIC is addressed in this paper. After distinguishing far-field signal subspace from mixed-field signal subspace, estimations of DOAs and powers of far-field sources are carried out. Then the corresponding far-field and noise signal components can be eliminated from the signal subspace. After that, based on path-following algorithm, modified 2D-MUSIC is performed for DOA and range estimations of near-field sources. The performance of the proposed method is verified and compared with the other methods through computer simulations. Reasonable classification of source types and accurate localization estimation can be achieved by using the proposed method.

Źródło:

Polish Maritime Research; 2018, S 2; 69-74
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Microscale laser shock imprinting of micro-molds with different sizes and shapes

Autorzy:

Yang, H.
Liu, K.
Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/174650.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

laser shock
imprinting
micro-mold
deformation depth
numerical simulation

Opis:

There are higher requirements for microstructures and high-precision components in microelectronics, photonics, sensors, optoelectronics and medical devices. For changing the traditional manufacturing methods with cumbersome process and complex equipment, researchers put forward a laser shock forming technique which can contribute to the metal forming with high precision and efficiency in recent years. So far, the laser shock forming needed high pulse energy and high energy. In this paper, nanosecond laser with high frequency and low pulse energy was adopted to make possible the aluminum foil forming on the copper micro-molds with different sizes and shapes. The deformations of aluminum foil were measured by SEM, optical profiler and AFM. Also, the deformation laws were analyzed by comparing imprinting results under different micro-molds. Lastly, stress distribution and deformation process of aluminum foil was investigated by numerical simulations.

Źródło:

Optica Applicata; 2018, 48, 4; 671-686
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Performance analysis of variable speed multiphase induction motor with pole phase modulation

Autorzy:

Liu, H.
Wang, J.
Zhang, Z.

Powiązania:

https://bibliotekanauki.pl/articles/140991.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

induction motor (IM)
pole phase modulation (PPM)
efficiency
FEM

Opis:

The pole phase modulation (PPM) technique is an effective method to extend speed range and torque capabilities for an integrated starter and hybrid electric vehicles applications. In this paper, the five pole-phase combination types of a multiphase induction motor (IM) with 36 stator slots and 36 stator conductors are presented and compared quantitatively by using the time-stepping finite element method (TS-FEM). The 36 stator conductors of the proposed multiphase IM are fed by a 36 leg inverter and the current phase angle and amplitude of each stator conductor can be controlled independently. This paper focuses on the winding connection, the PPM technique and the performance comparative analysis of each pole-phase combination types of the proposed multiphase IM. The flux distribution, air-gap flux density, output torque, core losses and efficiency of five pole-phase combination types have been investigated.

Źródło:

Archives of Electrical Engineering; 2016, 65, 3; 425-436
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Quantitative analysis of the relationship between shear strength and fractal dimension of solidified dredger fill with different fly ash content under monotonic shear

Autorzy:

Yang, S.
Liu, W.
Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/258498.pdf

Data publikacji:

2018

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

curing agent
fly ash
shear strength
fractal dimension
SEM

Opis:

The dredger fill of Shanghai Hengsha Island Dongtan is solidified by curing agents with different fly ash content, and the shear strength index of solidified dredger fill is measured by the direct shear test. The microscopic images of solidified dredger fill are obtained by using SEM. The microscopic images are processed and analyzed by using IPP, and the fractal dimension including particle size fractal dimension Dps, aperture fractal dimension Dbs and particle surface fractal dimension Dpr is calculated by fractal theory. The quantitative analysis of the relationship between shear strength index and fractal dimension of solidified dredger fill is done. The research results show that the internal friction angle and the cohesion are closely related to the fly ash content λ and the curing period T, and the addition of fly ash can improve the effect of curing agent; There is no obvious linear relationship between the internal friction angle and the three fractal dimensions; The smaller particle surface fractal dimension Dpr and particle size fractal dimension Dps, the larger aperture fractal dimension Dbs, the greater the cohesion, and the cohesion has a good linear relationship with three fractal dimensions, and the correlation coefficient R2 is above 0.91.

Źródło:

Polish Maritime Research; 2018, S 2; 132-138
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Numerical investigation of the inner flow in a centrifugal pump at the shut-off condition

Autorzy:

Liu, H.
Wu, X
Tan, M.

Powiązania:

https://bibliotekanauki.pl/articles/281524.pdf

Data publikacji:

2013

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

centrifugal pump
numerical simulation
shut-off condition
PIV

Opis:

The unsteady flow fields in a centrifugal pump at the shut-off condition (SOC) are simulated by the Unsteady Reynolds Averaged Navier-Stokes (URANS) approach. To improve simulation accuracy and assign the boundary condition, special 3D models are made. Three-dimensional URANS equations are solved on high-quality unstructured grids with the shear stress transport turbulence model by using the computational fluid dynamics (CFD) code CFX-11.0. Furthermore, the numerical simulation results are validated by particle image velocimetry (PIV) measurements. The main goal of the study is, on one hand, the validation of the numerical procedure proposed, and on the other hand, the detailed analysis of the unsteady inner flow field distribution and pressure fluctuation in the centrifugal pump at SOC. In addition, the head of the pump at SOC is predicted based on CFD results. The flow analysis indicates that there exists two eddies in each impeller flow passage, and the velocity at the volute diffusion part is very low. The amplitudes of pressure fluctuation at ƒr (impeller rotation frequency) and 3ƒr dominate in the impeller, while the pressure fluctuation at ƒb (blade passing frequency) is dominant in the volute.

Źródło:

Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 649-660
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Simultaneous disturbance compensation and H_i/H_∞ optimization in fault detection of UAVs

Autorzy:

Liu, H.
Zhong, M.
Yang, R.

Powiązania:

https://bibliotekanauki.pl/articles/331045.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

fault detection
disturbance compensation
unmanned aerial vehicle
detekcja uszkodzeń
kompensacja zakłóceń
bezzałogowy statek powietrzny

Opis:

This paper deals with the problem of robust fault detection (FD) for an unmanned aerial vehicle (UAV) flight control system (FCS). A nonlinear model to describe the UAV longitudinal motions is introduced, in which multiple sources of disturbances include wind effects, modeling errors and sensor noises are classified into groups. Then the FD problem is formulated as fault detection filter (FDF) design for a kind of nonlinear discrete time varying systems subject to multiple disturbances. In order to achieve robust FD performance against multiple disturbances, simultaneous disturbance compensation and H_i/H_∞ optimization are carried out in designing the FDF. The optimality of the proposed FDF is shown in detail. Finally, both simulations and real flight data are applied to validate the proposed method. An improvement of FD performance is achieved compared with the conventional H_i/H_∞-FDF.

Źródło:

International Journal of Applied Mathematics and Computer Science; 2018, 28, 2; 349-362
1641-876X
2083-8492

Pojawia się w:

International Journal of Applied Mathematics and Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Construction of waveform library in cognitive radar

Autorzy:

Guo, Y.
Wu, Y.
Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/260610.pdf

Data publikacji:

2017

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

fractional Fourier transform
ambiguity function
Barker
Frank
waveform libraries

Opis:

Based on the thoughts of cognitive radar, Fractional Fourier Transform (FrFT) is used to generate a rotatable waveform libraries of Frank coded/Barker coded waveform in this paper. Then, the ambiguity function is used to analyze the delay resolution, Doppler resolution, delay side-lobe level, and Doppler side-lobe level of the waveform libraries and orthogonality of them is also analyzed. Furthermore, we proved theoretically that there is a fixed coordinate transformation between the waveforms of library and its origin waveform. Therefore, the Cramér-Rao low bound (CRLB) of motion parameters can be computed easily using the waveforms of the libraries, which facilitate the subsequent waveform scheduled work. Simulation results show that the library waveforms can reduce delay resolution to satisfy the different situations and can bring significant benefits for delay resolution, orthogonality and reuse interval.

Źródło:

Polish Maritime Research; 2017, S 2; 22-29
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Rule based networks : an efficient and interpretable representation of computational models

Autorzy:

Liu, H.
Gegov, A.
Cocea, M.

Powiązania:

https://bibliotekanauki.pl/articles/91698.pdf

Data publikacji:

2017

Wydawca:

Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych

Tematy:

rule based networks
knowledge discovery
predictive modelling
rule representation

Opis:

Due to the vast and rapid increase in the size of data, data mining has been an increasingly important tool for the purpose of knowledge discovery to prevent the presence of rich data but poor knowledge. In this context, machine learning can be seen as a powerful approach to achieve intelligent data mining. In practice, machine learning is also an intelligent approach for predictive modelling. Rule learning methods, a special type of machine learning methods, can be used to build a rule based system as a special type of expert systems for both knowledge discovery and predictive modelling. A rule based system may be represented through different structures. The techniques for representing rules are known as rule representation, which is significant for knowledge discovery in relation to the interpretability of the model, as well as for predictive modelling with regard to efficiency in predicting unseen instances. This paper justifies the significance of rule representation and presents several existing representation techniques. Two types of novel networked topologies for rule representation are developed against existing techniques. This paper also includes complexity analysis of the networked topologies in order to show their advantages comparing with the existing techniques in terms of model interpretability and computational efficiency.

Źródło:

Journal of Artificial Intelligence and Soft Computing Research; 2017, 7, 2; 111-123
2083-2567
2449-6499

Pojawia się w:

Journal of Artificial Intelligence and Soft Computing Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

A new needle stonefly with parasitic mites from the Eocene Baltic amber

Autorzy:

Chen, Z.-T.
Liu, H.-L.

Powiązania:

https://bibliotekanauki.pl/articles/31341385.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

paleontology
Insecta
Baltileuctra dewalti
new species
needle stonefly
morphology
Leuctridae
Plecoptera
parasitic mite
Eocene
Baltic amber

Źródło:

Acta Palaeontologica Polonica; 2022, 67, 3; 649-654
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Scanning Tunneling Microscopy of Ordered Organic Monolayer Films on Si(001)

Autorzy:

Hamers, R. J.
Hovis, J.
Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/1968711.pdf

Data publikacji:

1998-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.16.Ch
34.50.Dy
68.55.-a

Opis:

Scanning tunneling microscopy and optical spectroscopy techniques have been utilized to investigate the formation of ordered organic monolayer films on the (001) face of silicon. Cyclopentene and 1,5-cyclooctadiene both produce monolayer films that are ordered translationally and rotationally. The rotational orientations of the molecules arise from the directional interaction of the π orbitals of the starting alkene with the π orbital of the dimers comprising the reconstructed Si(001) surface, with the Si(001) surface acting as a template for determining the directionality of molecules in the subsequent organic film. Using single-domain Si(001) samples, it is shown that the molecular films also exhibit anisotropy in optical properties when measured on centimeter length scales.

Źródło:

Acta Physica Polonica A; 1998, 93, 2; 289-295
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Ship Course Following and Course Keeping in Restricted Waters Based on Model Predictive Control

Autorzy:

Liu, H.
Ma, N.
Gu, X. C.

Powiązania:

https://bibliotekanauki.pl/articles/116264.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Morski w Gdyni. Wydział Nawigacyjny

Tematy:

Ship Movement, Multiple-Input Multiple-Output (MIMO)
Very Large Crude Carrier (VLCC)
Model Predictive Control (MPC)
Linear Quadratic Regulator (LQR)
course
restricted waters
safety at sea

Opis:

Ship navigation safety in restricted water areas is of great concern to crew members, because ships sailing in close proximity to banks are significantly affected by the so-called ship-bank interaction. The purpose of this paper is to apply the optimal control theory to help helmsmen adjust ships’ course and maintain the target course in restricted waters. To achieve this objective, the motion of a very large crude carrier (VLCC) close to a bank is modeled with the linear equations of manoeuvring and the influence of bank effect on the ship hydrodynamic force is considered in the model. State-space framework is cast in a Multiple-Input Multiple-Output (MIMO) system, where the offset-free model predictive control (MPC) is designed for course following and the linear quadratic regulator (LQR) is used for course keeping. Simulation results show that the control methods effectively work in ship course following and course keeping with varying ship-bank distances and water depths. The advantage of adopting speed variation as the second control input is obvious.

Źródło:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 2; 305-312
2083-6473
2083-6481

Pojawia się w:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Carbon-based acid catalyst from waste seed shells: preparation and characterization

Autorzy:

Wang, L. H.
Liu, H.
Li, L.

Powiązania:

https://bibliotekanauki.pl/articles/778575.pdf

Data publikacji:

2015

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

carbon-based solid acid
waste seed shells
esterification
transesterification
biodiesel

Opis:

A carbon-based solid acid catalyst was prepared by the sulfonation of carbonized seed shells of Jatropha curcas (J. curcas L.). The structure of amorphous carbon consisting of polycyclic aromatic carbon sheets attached a high density of acidic SO3H groups (2.0 mmol · g−1) was identified with scanning electron microscopy (SEM), fourier transform infrared (FTIR) spectroscopy, powder X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The performance of the solid acid catalyst was evaluated for biodiesel production in the esterification of oleic acid with methanol. 95.7% yield of biodiesel was obtained after 2 h reaction and the conversions with reused catalyst varied in the range of 95.7% to 95.1%, showing better activity and stability than commercial catalyst amberlyst-46. It was also observed that the prepared catalyst showed enhanced activity in the transesterification of triolein with methanol when compared with other solid acid catalysts. A synergistic effect results from the high density of SO3H groups and the good access of reactants to the acidic sites can be used to explain the excellent catalytic activity, as well as the strong affinity between the hydrophilic reactants and the neutral OH groups bonded to the polycyclic aromatic carbon rings.

Źródło:

Polish Journal of Chemical Technology; 2015, 17, 4; 37-41
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Numerical study of hydrodynamic derivatives and course stability under ship-bank interaction

Autorzy:

Liu, H.
Ma, N.
Gu, X. C.

Powiązania:

https://bibliotekanauki.pl/articles/116925.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Morski w Gdyni. Wydział Nawigacyjny

Tematy:

safety at sea
ship-bank interaction
Reynolds-Averaged Navier-Stokes (RANS)
hydrodynamic derivatives
hydrodynamics
Planar Motion Mechanism (PMM)
Circulating Water Channel (CWC)
User Defined Functions (UDF)

Opis:

Since ship-bank interaction affects the manoeuvrability of a ship navigating close to a bank, the determination of hydrodynamic derivatives is of great importance to assess the ship manoeuvrability. To obtain the hydrodynamic derivatives of the KVLCC2 model ship with different water depths and ship-bank distances, the simulation of PMM tests are carried out using an unsteady Reynolds-Averaged Navier–Stokes (RANS) based solver. Hybrid dynamic mesh technique is proposed to realize the simulation of pure yaw tests in confined water. Studies on the grid convergence and time-step-size convergence are firstly performed. Hydrodynamic derivatives for the ship in different water depths and ship-bank distances are compared. The course stability is investigated based on time-domain simulations and eigenvalue analysis, and the results show that the ship-bank interaction and shallow water effect have a remarkable influence on the course stability.

Źródło:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 4; 747-753
2083-6473
2083-6481

Pojawia się w:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

A comparison of objective functions of optimization-based smoothing algorithm for tetrahedral mesh improvement

Autorzy:

Dai, C.
Liu, H.-L.
Dong, L.

Powiązania:

https://bibliotekanauki.pl/articles/279637.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

objective function
mesh quality metric
optimization-based smoothing
mesh quality improvement
mesh generation

Opis:

The objective function based on mesh quality metric has a major impact on smoothing unstructured tetrahedral meshes. The ability of seven mesh quality metrics to distinguish four kinds of poor-quality elements and their effects on the change of element shape are analyzed in detail. Then, four better mesh quality metrics are chosen to construct objective functions. In addition, the rational determination of searching direction and the optimal step size in the optimization algorithm of solving the objective function are proposed. Finally, comparisons with the other three objective functions are made according to different number of elements, iteration limit, and the desired accuracy in the improved mesh. It is found that with the increase of the number of elements, the time consumed during optimization increases, but the changes of the worst quality element are different. The number of iterations has little effect on the mesh quality and the time cost. The increasing of the desired degree of accuracy will improve the mesh quality and cost more time. Furthermore, the approach using objective function is compared with Freitag’s common approach. It is clearly shown that it performs better than the existing approach.

Źródło:

Journal of Theoretical and Applied Mechanics; 2014, 52, 1; 151-163
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

A prediction method for load distribution in threaded connections

Autorzy:

Zhang, D.
Gao, S.
Niu, S.
Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/949123.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

load distribution
threaded connections
finite element analysis

Opis:

A new method has been developed for predicting the load distribution along the thread portion of a bolt and nut connection. The calculated results were validated by comparison with three-dimensional finite element analysis and Yamamoto’s method. It was shown that the load distribution predicted by the model in this paper was in good agreement with the results from finite element model, and the load ratio on the first thread by the prediction model and finite element model was slightly larger than the results from Yamamoto’s method. In addition, the results of calculation and finite element analysis indicated that the decreasing of the lead angle could improve the load distribution, the increasing of the length of thread engaged could significantly improve the load bearing capacity of the first thread, and the adopting of a material with low stiffness for the nut with respect to the bolt could improve the load distribution slightly.

Źródło:

Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 157-168
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Hydrothermal Synthesis and Microstructural, Optical Properties Characterization of $YVO_4$ Phosphor Powder

Autorzy:

Zhang, S.
Liang, Y.
Gao, X.
Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/1207386.pdf

Data publikacji:

2014-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.55.-m
42.70.Hj
78.67.-n

Opis:

The phonon energy of $YVO_4$ crystal is lower than other usual compounds of salt. So it is suitable as host material for down-conversion materials. Hydrothermal method was adopted to synthesize $YVO_4$ phosphor powder with the use of yttrium oxide and sodium vanadate as raw material. The change in the relative integral intensity of the (200) and (112) diffraction peaks indicates that macroscopic stress in the lattice obviously changes with the elevated hydrothermal reaction temperature. The $YVO_4$ phosphor powder synthesized involves a certain agglomeration of small particles. The phonon vibration in the $YVO_4$ originates mainly from the internal vibrations in the vanadium-oxygen tetrahedron, in addition to the Y-O and O-H vibrations. Due to a low phonon energy of only $2.8188 × 10^{-21} J$, $YVO_4$ helps to improve the down-conversion efficiency of rare-earth ions. A bandgap value of approximately 3.8 eV for the synthesized $YVO_4$ powders leads to good absorption properties in the ultraviolet region. Upon excitation by the 320 nm ultraviolet photon, the intrinsic emission of $YVO_4$ powders is annihilated, and a broadband emission of $VO_4^{3-}$ near 450 nm is observed at room temperature. The $YVO_4$ phosphor powder synthesized at 180C exhibits the maximum photoluminescence intensity because of its excellent crystallization.

Źródło:

Acta Physica Polonica A; 2014, 125, 1; 105-110
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

A Process Model of Building Sustainable Competitive Advantage for Multinational Enterprises:An Empirical Case Study
Model procesu budowania zrównoważonej przewagi konkurencyjnej dla przedsiębiorstw międzynarodowych:studium przypadku

Autorzy:

Shan, M.
You, J.
Wang, Y.
Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/371328.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN

Tematy:

multinational enterprises
MNEs
corporate social responsibility
corporate environmental behavior
corporate legitimacy
sustainable development
przedsiębiorstwo międzynarodowe
społeczna odpowiedzialność biznesu
wpływ biznesu na środowisko
legalność biznesu
rozwój zrównoważony

Opis:

Multinational enterprises (MNEs) are the leading entities in the process of global economic integration, whose international expansion would be regulated and constrained by environmental issues. Drawing on theories of corporate social responsibility, corporate environmental behavior and legitimacy, this paper establishes a grounded process model that has both theoretical and practical significance. The model reveals that development of sustainable competitive advantage of MNEs is a gradual process that is dependent on the corporate environmental behavior and the legitimation of their behaviors. Via a real in-depth case study of Badische Anilin-Soda-Fabrik (BASF), one of the largest chemical companies in the world, the application and effectiveness of the proposed process model are demonstrated. Also, implications of this model and future directions for both research and practice are indicated.
Przedsiębiorstwa międzynarodowe stanowią wiodące podmioty w procesie globalnej integracji gospodarczej, których ekspansja międzynarodowa powinna uwzględniać regulacje i ograniczenia związane z ochrona środowiska. Niniejszy artykuł, opierając się na teorii społecznej odpowiedzialności biznesu, jego wpływowi na środowisko i legalności działania, przedstawia model istotny zarówno z poziomu teorii, jak i praktyki. Model ten pokazuje, że budowanie zrównoważonej przewagi konkurencyjnej przedsiębiorstw międzynarodowych jest procesem stopniowym, zależnym od podejścia do środowiska. Zastosowanie i skuteczność proponowanego modelu wykazano na przykładzie jednego z największych zakładów chemicznych na świecie, którym jest Badische Anilin-Soda-Fabrik (BASF). Zaproponowano także przyszłe kierunki badań, tak w kontekście naukowym, jak i praktycznym.

Źródło:

Problemy Ekorozwoju; 2015, 10, 1; 67-78
1895-6912

Pojawia się w:

Problemy Ekorozwoju

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Preparation and Up-conversion Luminescence of Yb3+/Er3+/GZO Ceramics

Autorzy:

Li, G.
Wang, B.
Wang, R.
Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/779137.pdf

Data publikacji:

2018

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Up-conversion
Yb3+/Er3+/GZO
Ceramics
High purity
Luminescence

Opis:

Yb3+/Er3+/GZO ceramics have been synthesized with high temperature solid-state method. The phase and structure of the Yb3+/Er3+/GZO ceramics were characterized by X-ray diffraction (XRD). The XRD pattern that following ions Yb3+, Er3+ and Ga3+ were well doped into the ZnO lattice. Effi cient visible up-conversion (UC) red and green emission were observed under 980 nm excitation. The mechanism of the UC luminescence is investigated on the basis of the UC luminescence emission spectra, the power curve and energy level diagram. The infl uence of doping ions to the intensity ratio of red to green is analyzed and high purity of red light (red/green = 29.9) is fi nally obtained.

Źródło:

Polish Journal of Chemical Technology; 2018, 20, 3; 15-19
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Synthesis, characterization of Hollandite Ag2Mn8O16 on TiO2 nanotubes and their photocatalytic properties for Rhodamine B degradation

Autorzy:

Thabit, M.
Liu, H.
Zhang, J.
Wang, B.

Powiązania:

https://bibliotekanauki.pl/articles/779645.pdf

Data publikacji:

2018

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Ag-MnO2/TiO2
Ag2Mn8O16
nanotubes
nanocrystals
Photoelectrode
electrochemical deposition
Rhodamine B
Photo-catalytic efficiency

Opis:

In this research Ag₂ Mn₈ O₁₆  nanocrysls/TiO₂ nanotubes, photoelectrodes were successfully prepared through anodization and annihilation steps, followed by electrodeposition of MnO₂  and Ag in a three electrodes cell. The obtained photoelectrodes were dried, then annealed for crystallization, the morphology and structure of the fabricated electrodes were characterized via scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The light absorption and harvesting properties were investigated through UV–visible diffuse refl ectance spectrum (DRS), photocatalytic performances were evaluated by degradation of 50 mL of Rhodamine B (5 mg L_–1 ) under Xenon light irradiation for 2 h. Results illustrated that the fabricated photoelectrodes show remarkable photo-degradation properties of organic pollutants in aqueous mediums.

Źródło:

Polish Journal of Chemical Technology; 2018, 20, 2; 85-91
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Kinematic Analysis of 6-DOF Arms for H20 Mobile Robots and Labware Manipulation for Transportation in Life Science Labs

Autorzy:

Ali, M. M.
Liu, H.
Stoll, N.
Thurow, K.

Powiązania:

https://bibliotekanauki.pl/articles/384603.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

kinematic analysis 6-DOF robotic arm
validation of kinematic solution
labware localization
labware manipulation
Kinect sensor

Opis:

This paper presents the kinematic analysis of the H20 humanoid mobile robot. The kinematic analysis for the robot arms is essential to achieve accurate grasping and placing tasks for object transportation. The H20 robot has dual arms with 6 revolute joints with 6-DOF. For each arm, the forward kinematics is derived and the closed-form solution for the inverse kinematic problem with different cases of singularities is found. A reverse decoupling mechanism method is used to solve the inverse kinematic problem analytically by viewing the arm kinematic chain in reverse order. The kinematics solution is validated using MATLAB with robotics toolbox. A decision method is used to determine the optimal solution within multiple solutions of inverse kinematic depending on the joints’ limits and minimum joints motion. The workspace analysis of the arm is found and simulated. Finally, a verification process was performed on the real H20 arms by applying blind and vision based labware manipulation strategies to achieve the transportation tasks in real life science laboratories.

Źródło:

Journal of Automation Mobile Robotics and Intelligent Systems; 2016, 10, 4; 40-52
1897-8649
2080-2145

Pojawia się w:

Journal of Automation Mobile Robotics and Intelligent Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Characteristic studies of micron zinc particle hydrolysis in a fixed bed reactor

Autorzy:

Lv, M.
Liu, H.
Nie, X.
Ashraf, M. A.

Powiązania:

https://bibliotekanauki.pl/articles/260562.pdf

Data publikacji:

2015

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

hydrogen
zinc hydrolysis
thermal chemistry
fixed bed

Opis:

Zinc fuel is considered as a kind of promising energy sources for marine propeller. As one of the key steps for zinc marine energy power system, zinc hydrolysis process had been studied experimentally in a fixed bed reactor. In this study, we focus on the characteristics of micron zinc particle hydrolysis. The experimental results suggested that the steam inner diffusion is the controlling step of accumulative zinc particles hydrolysis reaction at a relative lower temperature and a relative higher water partial pressure. In other conditions, the chemical reaction kinetics was the controlling step. And two kinds of chemical reaction kinetics appeared in experiments: the surface reaction and the gas-gas reaction. The latter one occurs usually for larger zinc particles and high reaction temperature. Temperature seems to be one of the most important parameters for the dividing of different reaction mechanisms. Several parameters of the hydrolysis process including heating rate, water partial pressure, the particle size and temperature were also studied in this paper. Results show that the initial reaction temperature of zinc hydrolysis in fixed bed is about 410 oC. And the initial reaction temperature increases as the heating rate increases and as the water partial pressure decreases. The total hydrogen yield increases as the heating rate decreases, as the water partial pressure increases, as the zinc particle size decreases, and as the reaction temperature increases. A hydrogen yield of more than 81.5% was obtained in the fixed bed experiments.

Źródło:

Polish Maritime Research; 2015, S 1; 112-120
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Estimation of system reliability by using the PLS-regression based corrected response surface method
Ocena niezawodności systemu z wykorzystaniem poprawionej metody powierzchni odpowiedzi opartej na regresji cząstkowych najmniejszych kwadratów

Autorzy:

Liu, H.
Jiang, W.
Hulio, Z. H.
Wang, Q.

Powiązania:

https://bibliotekanauki.pl/articles/302091.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

reliability
mechanical system
partial least squares regression
response surface method
correction method
niezawodność
układ mechaniczny
regresja cząstkowych najmniejszych kwadratów
metoda powierzchni odpowiedzi
metoda korekcji

Opis:

A new computational method, referred as PLS-regression (PLSR) based corrected response surface method, has been developed for predicting the reliability of structural and mechanical systems subjecting to random loads, material properties, and geometry. The method involves a Corrected-Response Surface Model (C-RSM) based on the Partial Least Squares Regression Method (PLSRM) combined with some correction factors, and Monte Carlo Simulation (MCS), which is named as the Corrected-Partial Least Squares Regression-Response Surface Method (C-PLSRRSM). In order to develop an accurate surrogate model for the region determining the reliability of the system, a proper coefficient is presented to determine the sampling region of the input random variables. Due to a small number of original function evaluations, the proposed method is effective, particularly when a response evaluation entails costly finite-element, mesh-free, or other numerical analysis. Three numerical examples involving reliability problems of two structural systems and a mechanical system illustrate the method developed. Results indicate that the proposed method provides accurate and computationally efficient estimates of reliability. The proposed correction method, the PLSR based corrected response surface (C-PLSR-RS), can be the accurate surrogate model for calculating system reliabilities, especially for the implicit performance functions.
Nowa metoda obliczeniowa o nazwie "poprawiona metoda powierzchni odpowiedzi oparta na regresji PLS" (C-PLSRRSM) została opracowana dla potrzeb przewidywania niezawodności systemów konstrukcyjnych i mechanicznych poddanych obciążeniom losowym oraz charakteryzujących się losową geometrią oraz losowymi właściwościami materiałowymi. W metodzie uwzględniono pewne czynniki korekcyjne oraz symulację Monte Carlo. W celu opracowania odpowiedniego modelu zastępczego dla regionu stanowiącego o niezawodności systemu, przedstawiono współczynnik, który pozwala określić obszar pobierania próbek wejściowych zmiennych losowych. Ze względu na niewielką liczbę ocen funkcji początkowych, proponowana metoda jest skuteczna zwłaszcza wtedy, gdy ocena odpowiedzi wymaga kosztownej analizy numerycznej metodą elementów skończonych czy metodą automatycznie generowanej siatki (free mesh). Opracowaną metodę zilustrowano za pomocą trzech przykładów numerycznych dotyczących niezawodności dwóch systemów konstrukcyjnych oraz jednego układu mechanicznego. Wyniki wskazują, że proponowana metoda zapewnia dokładne i wydajne obliczeniowo oszacowanie niezawodności. Proponowana metoda C-PLSR-RS może stanowić trafny model zastępczy do obliczania niezawodności systemu, zwłaszcza w przypadku uwikłanych funkcji stanu granicznego.

Źródło:

Eksploatacja i Niezawodność; 2016, 18, 2; 260-270
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Structural and Optical Properties of ZnO Nanowires Doped with Magnesium

Autorzy:

Zhuang, H.
Wang, J.
Liu, H.
Li, J.
Xu, P.

Powiązania:

https://bibliotekanauki.pl/articles/1505046.pdf

Data publikacji:

2011-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.46.Km
61.72.uj
81.15.Gh
78.67.-n

Opis:

ZnO nanowires doped with Mg have been successfully prepared on Au-coated Si (111) substrates using chemical vapor deposition method with a mixture of ZnO, Mg, and activated carbon powders as reactants at 850°C. The structural, compositional, morphological and optical properties of the samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, and photoluminescence spectroscopy. The nanowires are single crystalline in nature and preferentially grow up along [0001] direction with the average diameter and length of about 60 nm and several hundred micrometers, respectively, thinner and longer than the results of literature using the similar method. Room temperature photoluminescence spectroscopy shows a blueshift from the bulk band gap emission, which can be attributed to Mg doping that were detected by energy dispersive X-ray analysis EDX in the nanowires. Finally, the possible growth mechanism of crystalline ZnO nanowires is discussed briefly.

Źródło:

Acta Physica Polonica A; 2011, 119, 6; 819-823
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Analysis Of Factors Affecting Gravity-Induced Deflection For Large And Thin Wafers In Flatness Measurement Using Three-Point-Support Method

Autorzy:

Liu, H.
Dong, Z.
Kang, R.
Zhou, P.
Gao, S.

Powiązania:

https://bibliotekanauki.pl/articles/220380.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

flatness measurement
large and thin silicon wafer
GID
three-point-support method
initial stress

Opis:

Accurate flatness measurement of silicon wafers is affected greatly by the gravity-induced deflection (GID) of the wafers, especially for large and thin wafers. The three-point-support method is a preferred method for the measurement, in which the GID uniquely determined by the positions of the supports could be calculated and subtracted. The accurate calculation of GID is affected by the initial stress of the wafer and the positioning errors of the supports. In this paper, a finite element model (FEM) including the effect of initial stress was developed to calculate GID. The influence of the initial stress of the wafer on GID calculation was investigated and verified by experiment. A systematic study of the effects of positioning errors of the support ball and the wafer on GID calculation was conducted. The results showed that the effect of the initial stress could not be neglected for ground wafers. The wafer positioning error and the circumferential error of the support were the most influential factors while the effect of the vertical positioning error was negligible in GID calculation.

Źródło:

Metrology and Measurement Systems; 2015, 22, 4; 531-546
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Tuning The Crystallographic Structure And Morphology Of Nanocrystalline CaB6 Films Deposited By DC Magnetron Sputtering
Optymalizacja struktury krystalograficznej i morfologii nanokrystalicznych warstw CaB6 naniesionych metodą napylania magnetronowego

Autorzy:

Zhang, L.
Zhao, G.
Liu, H.
Min, G.
Yu, H.

Powiązania:

https://bibliotekanauki.pl/articles/356295.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

CaB6 films
crystallographic structure
morphology
argon pressure
warstwy CaB6
struktura krystalograficzna
morfologia
ciśnienie argonu

Opis:

Through changing the argon pressure, CaB₆ films with different crystallographic orientation and morphology on glass substrates were prepared by direct current (DC) magnetron sputtering method. The film textures, crystallite sizes, composition and morphology were investigated by a spectrum of characterizing techniques in terms of X-ray diffraction (XRD), field emission scanning electron microscopy with energy dispersive spectrometer (FESEM-EDS), atomic force microscopy (AFM), Raman shift spectroscopy. The influence of argon pressure on microstructure was studied. The average grain size increased with the argon pressure increasing from 0.8 Pa to 1.5 Pa. Meanwhile, the dominant crystal face changed from (110) to (100). Then the grain size decreased when the argon pressure increased to 2.0 Pa. The surface morphology evolved from typical cauliflower-like nanocrystalline clusters to faceted rectangular pyramids. It was found that considerable amount of argon atoms were trapped in the films. The formation process of CaB₆ films was also analyzed in this paper.
Warstwy CaB₆ naniesiono na podłoża szkliste metodą magnetronowego rozpylania stałoprądowego (DC). Poprzez kontrolę ciśnienia argonu otrzymano warstwy o różnej morfologii i orientacji krystalograficznej. Strukturę, wielkość krystalitów oraz skład chemiczny warstw badano przy zastosowaniu następujących technik: dyfrakcji rentgenowskiej (XRD), skaningowej mikroskopii elektronowej w połączeniu ze spektroskopią dyspersji energii promieniowania rentgenowskiego (SEM-EDS), mikroskopii sił atomowych (AFM) oraz spektroskopii Ramana. Badano wpływ ciśnienia argonu na mikrostrukturę warstwy. Wraz ze wzrostem ciśnienia argonu z 0,8 Pa do 1,5 Pa zwiększyła się średnia wielkość ziaren przy jednoczesnej zmianie głównych kierunków krystalograficznych – z (110) w (100). Natomiast w wyniku dalszego wzrostu ciśnienia do 2,0 Pa, wielkość ziaren zmniejszyła się. Zaobserwowano także zmiany w morfologii powierzchni. Stwierdzono, że znaczna ilość atomów argonu została uwięziona w warstwach. W niniejszej pracy poddano także analizie proces powstawania warstw CaB₆.

Źródło:

Archives of Metallurgy and Materials; 2015, 60, 2A; 897-901
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Simplified Model for Predicting Fabric Thermal Resistance According to its Microstructural Parameters
Uproszczony model dla przewidywania oporu termicznego tkanin w zależności od ich parametrów mikrostruktury

Autorzy:

Wei, J.
Xu, S.
Liu, H.
Zheng, L.
Qian, Y.

Powiązania:

https://bibliotekanauki.pl/articles/233513.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

fabric model
thermal resistance
microstructure
correlation coefficient
model tkaniny
opór termiczny tkanin
mikrostruktura
współczynnik korelacji

Opis:

This paper presents a modified model to calculate the thermal resistance of woven and knitted fabrics according to the microstructural parameters. The model was established by analysing the heat transfer process in the simplified basic unit of the fabrics. The model was modified and checked by experimental values of various fabric samples. Pearson correlation coefficients between the thermal resistance and fabric structural parameters were calculated. Results indicate that fabric thermal resistance can be predicted by the modified equation satisfactorily. The Pearson correlation coefficient from high to low follows such a sequence: fabric thickness, fabric volume density, fabric structural parameter a, fibre volume density, and fibre thermal conductivity.
W artykule przedstawiono zmodyfikowany model pozwalający obliczyć opór termiczny tkanin i dzianin w zależności od parametrów ich mikrostruktury. Model został skonstruowany poprzez analizę procesu przepływu ciepła przez uproszczoną jednostkę płaskiego materiału włókienniczego. Model został sprawdzony w praktyce przez badanie różnych próbek tkanin i dzianin. Przy ocenie zastosowano porównanie współczynników korelacji Pearsona między oporem termicznym i parametrami strukturalnymi. Wyniki wskazują, że termiczną izolację płaskich materiałów włókienniczych można przewidzieć w zadowalającym stopniu przez zaproponowane zmodyfikowane równania. Współczynniki korelacji Pearsona począwszy od dużych do małych można uszeregować dla następujących parametrów: grubość tkaniny, gęstość właściwa tkaniny, parametry strukturalne, gęstość właściwa włókien i przewodność cieplna włókien.

Źródło:

Fibres & Textiles in Eastern Europe; 2015, 4 (112); 57-60
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Semi-analytical solution of optimization on moon-pool shaped WEC

Autorzy:

Zhang, W. C.
Liu, H. X.
Zhang, X. W.
Zhang, L.

Powiązania:

https://bibliotekanauki.pl/articles/963397.pdf

Data publikacji:

2016

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

wave energy
eigenfunction expansion
moon pool
conversion ability
optimization

Opis:

In order to effectively extract and maximize the energy from ocean waves, a new kind of oscillating-body WEC (wave energy converter) with moon pool has been put forward. The main emphasis in this paper is placed on inserting the damping into the equation of heaving motion applied for a complex wave energy converter and expressions for velocity potential added mass, damping coefficients associated with exciting forces were derived by using eigenfunction expansion matching method. By using surface-wave hydrodynamics, the exact theoretical conditions were solved to allow the maximum energy to be absorbed from regular waves. To optimize the ability of the wave energy conversion, oscillating system models under different radius-ratios are calculated and comparatively analyzed. Numerical calculations indicated that the capture width reaches the maximum in the vicinity of the natural frequency and the new kind of oscillating-body WEC has a positive ability of wave energy conversion.

Źródło:

Polish Maritime Research; 2016, S 1; 25-31
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Optimal configurations of wave energy converter arrays with a floating body

Autorzy:

Zhang, W.
Liu, H.
Zhang, X.
Zhang, L.
Ashraf, M. A.

Powiązania:

https://bibliotekanauki.pl/articles/260084.pdf

Data publikacji:

2016

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

wave energy
cylinder array
power take-off
hydrodynamic analysis

Opis:

An array of floating point-absorbing wave energy converters (WECs) is usually employed for extracting efficiently ocean wave energy. For deep water environment, it is more feasible and convenient to connect the absorbers array with a floating body, such as a semi-submersible bottom-moored disk, whose function is to act as the virtual seabed. In the present work, an array of identical floating symmetrically distributed cylinders in a coaxial moored disk as a wave energy device is proposed The power take-off (PTO) system in the wave energy device is assumed to be composed of a linear/nonlinear damper activated by the buoys heaving motion. Hydrodynamic analysis of the examined floating system is implemented in frequency domain. Hydrodynamic interferences between the oscillating bodies are accounted for in the corresponding coupled equations. The array layouts under the constraint of the disk, incidence wave directions, separating distance between the absorbers and the PTO damping are considered to optimize this kind of WECs. Numerical results with regular waves are presented and discussed for the axisymmetric system utilizing heave mode with these interaction factors, in terms of a specific numbers of cylinders and expected power production.

Źródło:

Polish Maritime Research; 2016, S 1; 71-77
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Nonlinear PTO effect on performance of vertical axisymmetric wave energy converter using semi-analytical method

Autorzy:

Liu, M.
Liu, H.
Zheng, X.
Chen, H.
Wang, L.
Zhang, L.

Powiązania:

https://bibliotekanauki.pl/articles/258878.pdf

Data publikacji:

2017

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

wave energy converter (WEC)
power take-off (PTO)
capture width ratios
analytical method
eigen function

Opis:

The wave energy, as a clean and non-pollution renewable energy sources, has become a hot research topic at home and abroad and is likely to become a new industry in the future. In this article, to effectively extract and maximize the energy from ocean waves, a vertical axisymmetric wave energy converter (WEC) was presented according to investigating of the advantages and disadvantages of the current WEC. The linear and quadratic equations in frequency-domain for the reactive controlled single-point converter property under regular waves condition are proposed for an efficient power take-off (PTO). A method of damping coefficients, theoretical added mass and exciting force are calculated with the analytical method which is in use of the series expansion of eigen functions. The loads of optimal reactive and resistive, the amplitudes of corresponding oscillation, and the width ratios of energy capture are determined approximately and discussed in numerical results.

Źródło:

Polish Maritime Research; 2017, S 3; 49-57
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Catalytic decomposition of toluene over La1-xSr xMnO3/palygorskite synthesized catalysts

Autorzy:

Song, L.
Chen, T.
Chen, D.
Chen, Y.
Xie, J.
Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/207996.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

catalysts
manganese
manganese oxide
toluene
transmission electron microscopy
X ray diffraction
Palygorskite
katalizatory
mangan
tlenek manganu
toluen
transmisyjna mikroskopia elektronowa
dyfrakcja promieniowania rentgenowskiego

Opis:

Palygorskite (PG) supported La1-xSrxMnO3 catalysts were fabricated by copreripitation. The catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), specific surface area (SSA) and H2 temperature programmed reduction (H 2-TPR). Catalytic activity for VOCs was examined by using toluene as a model compound. The results show that the surface area as well as mechanical strength of catalysts increase substantially after catalysts loaded in PG. XRD patterns show that after calcination at 700 0C, PG as a support in 9% LaMn03/PG and 9% La0.7Sr0.3MnO3/PG was transformed into amorphous phase and the morphology was not destroyed. It was well established that the main reductive components are factually Mn(III) or Mn(IV) oxides in catalysts based on the results of TPR. It was also found that Mn(IV) increases while Mn(III) reduces responding with the increasing amount of Sr. Toluene conversion rate of as-preparedμ% La1-xSr xMnO3/PG increases with the increasing values of x and μ when x=0-0.3 and μ = 3-9%. Toluene can be converted completely at 285 0C by 9% La0.7Sr0.3MnO3/PG catalyst while no significant change was observed after addition on the doping and loading amount of Sr. During a 100 h stability experiment of 9% La 0.7Sr0.3MnO3/PG catalyst, toluene removal was found to be above 95%.

Źródło:

Environment Protection Engineering; 2013, 39, 3; 31-42
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Analysis of the influence of the transducer and its coupling layer on round window stimulation

Autorzy:

Liu, H.
Xu, D.
Yang, J.
Yang, S.
Cheng, G.
Huang, X.

Powiązania:

https://bibliotekanauki.pl/articles/306655.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

słuch
stymulacja
przetwornik
RW
FEM
implantable middle ear hearing device
round window stimulation
transducer
coupling layer
finite element analysis

Opis:

Purpose: In this work, a finite element study is proposed to evaluate the effects of the transducer and its coupling layer on the performance of round window (RW) stimulation. Methods: Based on a set of micro-computer tomography images of a healthy adult’s right ear and reverse engineering technique, a coupled finite-element model of the human ear and the transducer was constructed and verified. Then, the effect of the cross-section of the transducer, the elastic modulus of the coupling layer, the mass of the transducer, and the preload of the transducer were studied. Results: The increase of the transducer’s cross-section area deteriorates the RW stimulation, especially at the lower frequencies. This adverse effect of the cross-section area’s increase of the transducer can be reduced by adding a coupling layer between the transducer and the RW. However, the coupling layer’s improvement on the RW stimulation is reduced with the increase of its elastic modulus. Moreover, the mass loading of the transducer decreases the RW stimulation’s performance mainly at higher frequencies and applying a static preload on the transducer enhances its hearing compensating performance at higher frequencies. Conclusions: The influence of the transducer’s mass, the mass of the transducer, the applied static preload and the properties of the coupling layer must be taken into account in the design of the RW stimulation type implantable middle ear hearing device.

Źródło:

Acta of Bioengineering and Biomechanics; 2017, 19, 2; 103-111
1509-409X
2450-6303

Pojawia się w:

Acta of Bioengineering and Biomechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Large deformation and stability analysis of a cylindrical rubber tube under internal pressure

Autorzy:

Sang, J.
Xing, S.
Liu, H.
Li, X.
Wang, J.
Lv, Y.

Powiązania:

https://bibliotekanauki.pl/articles/279927.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

large deformation analysis
stability analysis
rubber tube
nonlinear elastic theory

Opis:

Rubber tubes under pressure can undergo large deformations and exhibit a particular nonlinear elastic behavior. In order to reveal mechanical properties of rubber tubes subjected to internal pressure, large deformation analysis and stability analysis have been proposed in this paper by utilizing a modified Gent’s strain energy function. Based on the nonlinear elastic theory, by establishing the theoretical model of a rubber tube under internal pressure, the relationship between the internal pressure and circumferential principal stretch has been deduced. Meanwhile stability analysis of the rubber tube has also been proposed and the relationship between the internal pressure and the internal volume ratio has been achieved. The effects on the deformation by different parameters and the failure reasons of the rubber tube have been discussed, which provided a reasonable reference for the design of rubber tubes.

Źródło:

Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 177-188
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Thermal Mechanical Stress Analysis of Ladle Lining with Integral Brick Joint

Autorzy:

Chang, W.
Li, G.
Kong, J.
Sun, Y.
Jiang, G.
Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/354915.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

ladle
heat transfer model
lining
expansion joint
thermal mechanical stress

Opis:

Based on the theory of heat transfer, the influence of expansion joints on the temperature and stress distribution of ladle lining is discussed. In view of the current expansion joint, the mathematical model of heat transfer and the three dimensional finite element model of ladle lining brick are established. By analyzing the temperature and stress distribution of ladle lining brick when the expansion joints are in different sizes, the thermal mechanical stress caused by the severe temperature difference can be reduced by the suitable expansion joint of the lining brick during the ladle baking and working process. The analysis results showed that the thermal mechanical stress which is caused by thermal expansion can be released through the 2 mm expansion joint, which is set in the building process. So we can effectively reduce the thermal mechanical stress of the ladle lining, and there is no risk of steel leakage, thus the service life of ladle can be effectively prolonged.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 2; 659-666
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Multi-parameter measurement under fiber bending based on directional resonance coupling in photonic crystal fibers

Autorzy:

Tan, C.
Wang, Q.
Ding, Y.
Li, H.-W.
Wang, M.
Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/174320.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

fiber bending
multi-parameter measurement
photonic crystal fiber
fiber sensing

Opis:

A multi-parameter sensor with enhanced sensitivity based on magnetic fluids infiltrated photonic crystal fiber is proposed. The sensing performances are investigated using the mode coupling theory and finite element method. Four symmetrical defective channels are assembled into the photonic crystal fiber to produce two resonant transmission dips λ_CV and λ_CH in vertical and horizontal directions, respectively. Each dip can be split into two relatively shallow dips (λ_CV1, λ_CV2 or λ_CH1, λ_CH2) when the photonic crystal fiber is bent. Interestingly, the values of (λ_CH2 – λ_CH1) and (λ_CV2 – λ_CV1) are associated with corresponding bend-curvature but almost unaffected by external temperature or magnetic field. On the contrary, the values of (λ_CH2 + λ_CH1)/2 and (λ_CV2 + λ_CV1)/2 are sensitive to temperature or magnetic field regardless of the bending condition. Based on above characteristics and the dependence of the magnetic fluids refractive index on temperature and magnetic field, the proposed sensor can measure not only the bend-curvature and bend-direction, but also the temperature and magnetic field.

Źródło:

Optica Applicata; 2018, 48, 3; 449-462
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Experimental study of multi-ribbed one-way composite slabs made of steel fibre, foam, and normal concrete
Badanie doświadczalne wielorowkowej, jednokierunkowej płyty zespolonej wykonanej z włókna stalowego, pianki i zwykłego betonu

Autorzy:

Wang, Y.
Liu, H. T.
Dou, G. F.
Xi, C. H.
Qian, L.

Powiązania:

https://bibliotekanauki.pl/articles/230929.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

włókno stalowe
beton piankowy
płyta wielorowkowa
płyta jednokierunkowa
płyta zespolona
steel fibre
foam concrete
multi-ribbed slab
one-way slab
composite slab

Opis:

This paper aims to study the effect of reinforcement configuration (steel fibre and rebar) on the mechanical performance of composite slabs of the same total steel contents. We manufactured four pieces of full-scale multi-ribbed composite prefabricated slabs with different reinforcement configurations by using steel fibre-reinforced concrete, foam concrete, and normal concrete. The multi-ribbed composite prefabricated slab has many excellent properties, such as light weight, good thermal and sound insulation. Thus, it can be applied to fabricated structures. In addition, the composite prefabricated slabs with the same total steel contents but with different reinforcement configurations were studied under the same static load, and many technical indicators such as crack resistance capacity, yield load, ultimate load capacity, maximum deflection, destructive pattern, and stress of steel rebar were obtained. Results indicate reinforcement configuration has a significant effect on the mechanical performance of composite prefabricated slabs with the same total steel contents, and composite prefabricated slabs reinforced with longitudinal rebar and steel fibre (volume fraction is 1.5%) have the best mechanical performance and ductility.
Dodanie włókna do betonu może zwiększyć odporność na pękanie, wytrzymałość na rozciąganie i sztywność. A zatem, beton zbrojony włóknem szklanym posiada wiele zastosowań inżynieryjnych jako rodzaj materiałów budowlanych, a ponadto istnieje wiele kodeksów zawierających wskazówki dotyczące jego konstrukcji. Beton zbrojony włóknem stalowym, otrzymywany poprzez dodanie losowo rozproszonego krótkiego włókna stalowego do betonu, jest rodzajem wieloskładnikowego materiału kompozytowego na bazie cementu. Ma dobre właściwości fizyczne i mechaniczne. Beton piankowy, który posiada wiele doskonałych właściwości, w tym lekkość i dobrą izolację termiczną, jest szeroko stosowany jako materiał ścienny, dachowy i podłogowy. Jednakże, ze względu na fakt, iż beton piankowy charakteryzuje się wysoką zdolnością pochłaniania wody, posiada słabą odporność na mrozy po wchłonięciu wody i może łatwo ulegać pęknięciu podczas cykli zamrażania i rozmrażania, co wpływa na funkcję i wygląd zewnętrzny budynku. Natomiast beton zbrojony włóknem stalowym charakteryzuje się dobrą odpornością na pękanie i nieprzepuszczalności. Dlatego też, łącząc zalety betonu zbrojonego włóknem stalowym (dobra nieprzepuszczalność) z wielorowkową strukturą (dobre właściwości mechaniczne), zaprojektowaliśmy nowy rodzaj wielorowkowej, prefabrykowanej płyty zespolonej. Celem niniejszej pracy jest zbadanie wpływu konfiguracji zbrojenia (włókna stalowego i pręta zbrojeniowego) na właściwości mechaniczne płyt zespolonych o takiej samej zawartości stali. Wyprodukowaliśmy cztery kawałki pełnowymiarowych, wielorowkowych, prefabrykowanych płyt zespolonych o różnych konfiguracjach zbrojenia, z wykorzystaniem betonu zbrojonego włóknem stalowym, betonu piankowego i zwykłego betonu. Wielorowkowa, zespolona, prefabrykowana płyta posiada wiele doskonałych właściwości, takich jak lekkość, dobra izolacja termiczna i akustyczna, itp. W związku z tym, może być ona stosowana na wytworzonej konstrukcji. Ponadto, zbadano zespolone, prefabrykowane płyty o takiej samej zawartości stali, lecz różnych konfiguracjach zbrojenia, pod takim samym obciążeniem statycznym i uzyskano wiele wskaźników technicznych, takich jak odporność na pękanie, obciążenie plastyczne, maksymalna nośność, maksymalne ugięcie, destrukcyjny wzór oraz naprężenie stalowych prętów zbrojeniowych. Wyniki pokazują, że konfiguracja zbrojenia ma znaczący wpływ na właściwości mechaniczne zespolonych, prefabrykowanych płyt o takiej samej zawartości stali, a zespolona, prefabrykowana płyta zbrojona podłużnym prętem zbrojeniowym i włóknem stalowym (ułamek objętościowy wynosi 1,5%) charakteryzuje się najlepszymi parametrami mechanicznymi i plastycznością.

Źródło:

Archives of Civil Engineering; 2018, 64, 2; 79-96
1230-2945

Pojawia się w:

Archives of Civil Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Potential risk of Mesodinium rubrum bloom in the aquaculture area of Dapeng’ao cove, China: diurnal changes in the ciliate community structure in the surface water

Autorzy:

Liu, H.
Song, X.
Huang, L.
Tan, Y.
Zhong, Y.
Huang, J.R.

Powiązania:

https://bibliotekanauki.pl/articles/47949.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

potential risk
Mesodinium rubrum
bloom
aquaculture area
Dapeng'ao cove
China
diurnal change
ciliate community
surface water
heavy rainfall
water column
stratification
irradiance

Opis:

Diurnal changes in the structure of the ciliate community in surface waters were studied in the aquaculture area of Dapeng’ao cove, China. Two periods of heavy rainfall occurred during the study period, intensifying water column stratification and influencing the water’s properties. A total of 21 ciliate taxa from 15 genera were identified; the dominant species was Mesodinium rubrum. The maximum abundance of M. rubrum reached 3.92×104 indiv. dm−3, contributing 95.1% (mean value) to the total ciliate abundance. Diurnal changes in M. rubrum abundance were highly variable, the driving force probably being irradiance and food availability. The results suggest that M. rubrum may form blooms in aquaculture areas when there is a suitable physical regime with enriched nutrients, which is potentially harmful to the fish-farming industry.

Źródło:

Oceanologia; 2012, 54, 1
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Stochastic hopf bifurcation of quasi-integrable hamiltonian systems with time-delayed feedback control
Stochastyczna bifurkacja Hopfa w quasi-całkowalnych układach Hamiltonowskich sterowanych w pętli sprzężenia zwrotnego z opóźnieniem

Autorzy:

Liu, Z. H.
Zhu, W. Q.

Powiązania:

https://bibliotekanauki.pl/articles/280917.pdf

Data publikacji:

2008

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

stochastyczna bifurkacja Hopfa
quasi-całkowalny układ Hamiltonowski
sprzężenie zwrotne z opóźnieniem
stochastic Hopf bifurcation
quasi-integrable Hamiltonian system
stochastic averaging
time-delayed feedback control

Opis:

The stochastic Hopf bifurcation of multi-degree-of-freedom (MDOF) quasi-integrable Hamiltonian systems with time-delayed feedback control subject to Gaussian white noise excitations is studied. First, the time-delayed feedback control forces are approximately expressed in terms of the system state variables without time delay, and the system is converted into anordinary quasi-integrable Hamiltonian system. The averaged It�o stochastic differential equations are derived by using the stochastic averaging method for quasi-integrable Hamiltonian systems. Then, an expression for the average bifurcation parameter of the averaged system is obtained approximately, and a criterion for determining the stochastic Hopf bifurcation caused by the time-delayed feedback control forces in the original system as the value of the average bifurcation parameter changing is proposed. An example is worked out in detail to illustrate the above criterion and its validity, and to show the effect of the time delay in the feedback control on the stochastic Hopf bifurcation of the system.
W pracy zajęto się problemem stochastycznej bifurkacji Hopfa quasi-całkowalnych układów Hamiltonowskich o wielu stopniach swobody poddanych wymuszeniu białym szumem z układem sterowania opartym na pętli sprzężenia zwrotnego z opóźnie- niem. Najpierw znaleziono przybliżone wyrażenia na siły sterujące w funkcji zmiennych stanu układu bez opóźnienia, a następnie przetransformowano go postaci quasi- całkowalnej, Hamiltonowskiej. Wyprowadzono stochastyczne równania różniczkowe It^o za pomocą metody uśredniania układów quasi-całkowalnych. Znaleziono przybliżoną postać wyrażenia na parametr bifurkacyjny uśrednionego układu i zaproponowano kryterium stwierdzające obecność stochastycznej bifurkacji Hopfa wywołanej siłami sterującymi z opóźnieniem na podstawie wartości zmiany tego parametru. Opracowa- no szczegółowo przykład do ilustracji działania tego kryterium i zakresu jego stosowalności oraz do prezentacji wpływu opóźnienia w pętli sterownia na stochastyczną bifurkację Hopfa badanego układu.

Źródło:

Journal of Theoretical and Applied Mechanics; 2008, 46, 3; 531-550
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

A Dedispersion Transform Method for Extracting the Normal Modes of a Shallow Water Acoustic Signal in the Pekeris Waveguide

Autorzy:

Yang, G.- B.
Lü, L.- G.
Gao, D.- Z.
Jiang, Y.
Liu, H.- N.

Powiązania:

https://bibliotekanauki.pl/articles/177234.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

normal mode extraction
dedispersion transform
Pekeris waveguide
source ranging

Opis:

The normal modes cannot be extracted even in the Pekeris waveguide when the source-receiver distance is very close. This paper introduces a normal mode extraction method based on a dedispersion transform (DDT) to solve this problem. The method presented here takes advantage of DDT, which is based on the waveguide invariant such that the dispersion associated with all of the normal modes is removed at the same time. After performing DDT on a signal received in the Pekeris waveguide, the waveform of resulting normal modes is very close to the source signal, each with different position and amplitude. Each normal mode can be extracted by determining its position and amplitude parameters by applying particle swarm optimization (PSO). The waveform of the extracted normal mode is simply the waveform of the source signal; the real waveform of the received normal mode can then be recovered by applying dispersion compensation to the source signal. The method presented needs only one receiver and is verified with experimental data.

Źródło:

Archives of Acoustics; 2015, 40, 1; 11-18
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Chinese cabbage BrMYB34.2 transcription factor regulates indolic glucosinolates biosynthesis in Arabidopsis

Autorzy:

Zhao, Y.
Zhang, Y.
Guo, X.
Ma, Y.
Zhang, P.
Liu, H.
Liu, G.
Guo, J.

Powiązania:

https://bibliotekanauki.pl/articles/12705984.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie

Opis:

Glucosinolates (GS) are a group of sulfur- and nitrogen-rich plant secondary metabolites that originate from amino acids and exist mainly in plants in the order Brassicales, such as Arabidopsis thaliana (Arabidopsis) and Chinese cabbage (Brassica rapa ssp. pekinensis). To date, several regulatory components responsible for GS biosynthesis have been identified in Arabidopsis. However, the functions of GS biosynthesis regulators in Chinese cabbage have not been clarified. In our current study, a putative ATR1/MYB34 orthologous gene, BrMYB34.2, was isolated from Chinese cabbage leaves. To investigate the function of this gene, we engineered Arabidopsis plants that overexpress BrMYB34.2 ectopically and phenotypic analysis was performed. Moreover, we assayed the accumulation levels of indolic GS (IGS) and aliphatic glucosinolates in transgenic plants and test the expression of key genes of IGS biosynthesis and tryptophan synthesis by Real-time quantitative PCR. And further analysed the resistance of transgenic plants in 5MT stress treatment. The results indicate that ectopic expression of the BrMYB34.2 gene in Arabidopsis was able to up-regulate the accumulation level of IGS due to the increased expression of IGS and Trp biosynthetic genes. Moreover, overexpression of BrMYB34.2 conferred Arabidopsis 5MT resistance. These results suggest that the BrMYB34.2 gene may function as one of the regulators of IGS and Trp biosynthesis in Chinese cabbage.

Źródło:

Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 1; 85-95
1644-0692

Pojawia się w:

Acta Scientiarum Polonorum. Hortorum Cultus

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Horizontal transfer and functional evaluation of high pathogenicity islands in Avian Escherichia coli

Autorzy:

Tu, J.
Qi, K.
Song, X.
Xue, T.
Ji, H.
Shao, Y.
Liu, H.
Zhou, X.
Zhu, L.

Powiązania:

https://bibliotekanauki.pl/articles/30119.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Opis:

High pathogenicity islands (HPIs) in Escherichia coli encode genes that are primarily involved in iron uptake and regulation, and confer virulence and pathogenicity. The aim of this study was to investigate the transfer of HPIs in avian E. coli and identify the function of HPI in the acceptor strain. The HPI transfer strain was obtained under conditions of low temperature and low iron abundance, and the donor and acceptor strains were confirmed. E. coli HPIs are transferred by horizontal gene transfer events, which are likely mediated primarily by homologous recombination in HPI-adjacent sequences. Assays for biological activity and pathogenicity changes in the acceptor strain indicated that HPIs might not be involved in pathogenesis in avian E. coli, and thus the main function of HPIs in this strain of bacteria may be to regulate iron nutrition.

Źródło:

Polish Journal of Veterinary Sciences; 2017, 20, 2
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Building the B2B customer loyalty : a role of relationship quality
Budowanie lojalności klienta B2B : rola jakości relacji

Autorzy:

Liu, L.-W.
Yang, W.-G.
Liu, W.-H.

Powiązania:

https://bibliotekanauki.pl/articles/405772.pdf

Data publikacji:

2017

Wydawca:

Politechnika Częstochowska

Tematy:

information sharing
customer orientation
B2B relationship
PLS-SEM
relationship marketing
wymiana informacji
orientacja na klienta
relacje B2B
marketing relacji

Opis:

The purpose of this study was to investigate the E-Commerce relationship quality and loyalty in B2B supplier and client’s relationships. This study tries to conceptualize a model based on the relationship quality that is applied to understand loyalty in B2B environment. The subjects of this study, from whom 81 valid questionnaires were collected, were the clients of the supplier’s ERP system in the Taiwan. When descriptive statistics and partial least squares (PLS) were adopted to analyse the collected valid data, we obtained the following findings. Relationship quality was perceived through the behavior of both supplier and clients and the quality of their interaction. Relationship quality antecedents include the information sharing and customer orientation. The finding suggests that supplier with strong levels of customer orientation, the supplier and clients were built a stronger relationship and high loyalty. Surprisingly, information sharing shown no significant effects on the relationship quality. This study implies that using information sharing and customer orientation strengthen their relationship quality, thereby enhancing loyalty. The finding of this study implies that it is important for a B2B supplier management to understand clients’ needs and responses. B2B suppliers can learn from this study, that customer orientation, relationship quality, commitment, have a positive impact on loyalty in both direct and indirect ways.
Celem artykułu była analiza jakości relacji z klientami i lojalności w handlu elektronicznym u dostawcy B2B. Niniejsze badanie jest próbą konceptualizacji modelu opartego na jakości relacji, który jest próbą zrozumienia lojalności w środowisku B2B. Przedmiotem badania byli wybrani klienci systemu ERP w oparciu na zebranych 81 kwestionariuszach firm na Tajwanie. Przyjęto statystyki opisowe i w oparciu o metodę najmniejszych kwadratów (PLS) w celu przeanalizowania zebranych istotnych danych. Jakość relacji postrzegano poprzez zachowanie zarówno dostawcy, jak i klientów oraz jakość ich interakcji. Jakość relacji przede wszystkim obejmuje dzielenie się informacjami i orientację na klienta. Wyniki sugerują, że dostawcy z silnym poziomem orientacji na klienta, zbudowali silniejszą więź i wysoką lojalność relacji z dostawcami i klientami. Co zaskakujące, wymiana informacji nie wykazała znaczącego wpływu na jakość relacji. Badanie zakłada, że korzystanie z wymiany informacji i orientacja na klienta wzmacnia ich jakość relacji, zwiększając przez to lojalność. Odkrycie tego badania implikuje, że dla dostawcy usług B2B ważne jest zrozumienie potrzeb i odpowiedzi klientów. Dostawcy B2B winni zauważyć, że orientacja na klienta, jakość relacji, zaangażowanie, mają pozytywny wpływ na lojalność zarówno w sposób bezpośredni, jak i pośredni.

Źródło:

Polish Journal of Management Studies; 2017, 16, 1; 105-114
2081-7452

Pojawia się w:

Polish Journal of Management Studies

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Pullout evaluation of sawbone experiment in different types of pedicle screws combined with bone cement augmentation for severe osteoporotic spine

Autorzy:

Yang, S.-C.
Liu, P.-H.
Tu, Y.-K.

Powiązania:

https://bibliotekanauki.pl/articles/307271.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

osteoporoza
kości
wytrzymałość
osteoporosis
bone cement augmentation
cannulated pedicle screw
sawbone
pullout strength

Opis:

Purpose: The conventional screw is unable to provide enough screw-bone interface strength for osteoporotic cencellous bone, and complications resulting from loosening or failure of the implants remain a significant clinical problem. Hence, the purpose of this study is to investigate pullout strength and energy in three types of the pedicle screws, including conventional solid pedicle screw, cannulated pedicle screw, and cannulated pedicle screw with a central pin, using osteoporotic sawbone test block with different bone cement volumes through pullout force testing. Methods: The control group (n = 15) of the osteoporotic sawbone test block includes groups A, B, and C to reflect three types of the pedicle screws without bone cement augmentation. The cemented group (n = 45) of the osteoporotic sawbone test block includes groups D1, D2, D3, E1, E2, E3, F1, F2, and F3 to reflect three types of the pedicle screws with PMMA bone cement of 2, 3, and 4 mL augmentation. Results: The results showed that the pullout strength and energy in the cemented group were significantly larger than that in the control group. Moreover, the best performances of the pullout strength and energy in the cemented group were evidenced obviously in the case of cannulated pedicle screw with a central pin with 4 mL bone cement augmentation. Conclusions: This study concludes that cement argumentation in the cannulated pedicle screw with a central pin can increase a pullout strength of pedicle screw for severe osteoporotic patients while bone cement of injective volume is limited.

Źródło:

Acta of Bioengineering and Biomechanics; 2018, 20, 2; 55-64
1509-409X
2450-6303

Pojawia się w:

Acta of Bioengineering and Biomechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Development of a SYBR Green I real-time PCR assay for detection of novel porcine parvovirus 7

Autorzy:

Li, Y.D.
Yu, Z.D.
Bai, C.X.
Zhang, D.
Sun, P.
Peng, M.L
Liu, H.
Wang, J.
Wang, Y.

Powiązania:

https://bibliotekanauki.pl/articles/2087207.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Capsid gene
PPV7
SYBR Green I real-time PCR

Źródło:

Polish Journal of Veterinary Sciences; 2021, 24, 1; 43-49
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Toluene Mono-nitration in a Semi-batch Reactor

Autorzy:

Chen, L. P.
Chen, W. P.
Liu, Y.
Peng, J. H.
Liu, R. H.

Powiązania:

https://bibliotekanauki.pl/articles/358853.pdf

Data publikacji:

2008

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

toluene mono-nitration
apparent activation energy
semi-batch reaction
thermal hazard

Opis:

Toluene mono-nitration in a semi-batch reactor was investigated with reaction calorimeter (RC1). The mixed acid HNO3/H2SO4/H2O (wt%) was used in proportion 13/66/21, which is similar to industrial parameters. The exothermic rates at different reaction temperatures were compared, and then the curves of heat generation rate after dosing were analyzed. The Maximal Temperature attainable by runaway of the desired Synthetic Reaction (MTSR) under different conditions were calculated for the course hazard evaluation. The results showed that the average reaction heat of mono-nitration was between 169.07~177.11 kJ mol-1, and the special heat of reactant was about 2 kJ kg-1 K-1. Average Ea of second order kinetic was about 30 kJ mol-1, and reaction rate was 10-4 mol s-1 l-1 order of magnitude when the strength of sulphuric acid was about 73.5%. It was also found that when temperature or stirring speed increases, the potential heat accumulation decreases.

Źródło:

Central European Journal of Energetic Materials; 2008, 5, 2; 37-47
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Relationship of adiponectin, leptin, visfatin and IGF-1 in cow’s venous blood and venous cord blood with calf birth weight

Autorzy:

Shen, L.
Zhu, Y.
Xiao, J.
Deng, J.
Peng, G.
Zuo, Z.
Yu, S.
Ma, X.
Zhong, Z.
Ren, Z.
Zhou, Z.
Liu, H.
Zong, X.
Cao, S.

Powiązania:

https://bibliotekanauki.pl/articles/2087491.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

adiponectin
leptin
IGF-1
birth weights
cow

Źródło:

Polish Journal of Veterinary Sciences; 2019, 3; 541-548
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

The study on bactericidal effect and ultrastructural alterations of chlorocresol nanoemulsion disinfectant against Staphylococcus aureus

Autorzy:

Zhang, Y.F.
Sun, Y.W.
Liu, X.H.
An, Z.X.
Yang, X.F.

Powiązania:

https://bibliotekanauki.pl/articles/16647452.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

chlorocresol
nanoemulsion
disinfectant
Staphylococcus aureus
bactericidal effect
ultrastructure

Opis:

Chlorocresol nanoemulsion disinfectant (CND) is an environmental disinfectant prepared with nanoemulsion as its drug carrier. This study aimed to investigate the bactericidal effect of CND on Staphylococcus aureus ( S. aureus) and its effect on bacterial ultrastructure. The neutralizing effect of CND against S. aureus was first screened by suspension quantitative evaluation experiment procedure of neutralizer. Disinfection performance was evaluated by the determination of Minimal Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC), quantitative bactericidal experiment, and comparative experiment of disinfection performance between 0.1% CND and 0.1% chlorocresol aqueous solution. Meanwhile, the effect of CND on the ultrastructure of S. aureus was investigated with scanning electron microscope (SEM) and transmission electron microscope (TEM) to preliminarily explore the bactericidal mechanism. The results showed that 3% Tween-80 in PBS could be screened as the neutralizer of CND against S. aureus. MIC and MBC were 100 μg/mL and 200 μg/mL, respectively. The bactericidal rates were all 100% when 0.06% and 0.08% disinfectant acted for 15 and 5 min, respectively. Furthermore, compared with 0.1% chlorocresol aqueous solution, the bactericidal effect of 0.1% CND was significantly enhanced (p<0.01). After treatment with CND for 10 min, SEM observation showed that the morphology of S. aureus cells were changed and the integrity destroyed. TEM observation showed that the cell shape changed, and the structures of the cell wall, cell membrane and cytoplasm were damaged in varying degrees. CND showed the strong bactericidal effect on S. aureus and could cause ultrastructure alterations of S. aureus.

Źródło:

Polish Journal of Veterinary Sciences; 2023, 26, 1; 13-20
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Characterization of serum adiponectin and leptin in healthy perinatal dairy cows or cows with ketosis, and their effectson ketosis involved indices

Autorzy:

Shen, L.
Qian, B.
Xiao, J.
Zhu, Y.
Hussain, S.
Deng, J.
Peng, G.
Zuo, Z.
Zou, L.
Yu, S.
Ma, X.
Zhong, Z.
Ren, Z.
Wang, Y.
Liu, H.
Zhou, Z.
Cai, D.
Hu, Y.
Zong, X.
Cao, S.

Powiązania:

https://bibliotekanauki.pl/articles/2087289.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

adiponectin
dairy cows
ketosis
leptin
perinatal period

Źródło:

Polish Journal of Veterinary Sciences; 2020, 23, 3; 373-381
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

The distribution of different virulence grass carp reovirus strains in some neglected tissues

Autorzy:

Liang, H.R.
Fu, X.Z.
Li, N.Q.
Liu, L.H.
Lin, Q.
Li, Y.G.
Peng, Y.A.
Huang, Z.B.
Wu, S.Q.

Powiązania:

https://bibliotekanauki.pl/articles/30668.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Źródło:

Polish Journal of Veterinary Sciences; 2016, 19, 4
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Oil-assisted flotation of fine hematite using sodium oleate or hydroxamic acids as a collector

Autorzy:

Li, H.
Liu, M.
Liu, Q.

Powiązania:

https://bibliotekanauki.pl/articles/109749.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

hematite
sodium oleate
kerosene
Batch Flotation
Octyl hydroxamic acid
Oleoyl hydroxamic acid

Opis:

Micro-flotation and batch flotation tests were carried out on fine (-20 µm) hematite to investigate the influences of non-polar oil when sodium oleate, octyl hydroxamic acid, or oleoyl hydroxamic acid was used as a collector. Both micro-flotation and batch flotation tests were performed using single hematite mineral and/or artificial mixed minerals (hematite:quartz = 1:1), and kerosene was utilized as the neutral oil. The experimental results showed that the addition of a kerosene emulsion benefited hematite recovery in the micro-flotation tests where a froth layer did not exist. In the batch flotation where a froth layer existed, kerosene behaved differently when used in conjunction with the three collectors. Kerosene helped improve the batch flotation when sodium oleate or oleoyl hydroxamic acid was used as a collector. However, it reduced concentrate weight yield, grade and recovery to a noticeable extent when octyl hydroxamic acid was used as a collector, especially at low dosages. In addition, single hematite batch flotation kinetics tests coupled with water recovery measurement were carried out to study the role of kerosene at different collector dosages. It was observed that water drainage and the resulting froth destabilization by kerosene was dominant at low collector dosages, especially in the flotation using octyl hydroxamic acid. At higher collector dosages, the water drainage and froth destabilization effect by kerosene was possibly counter-balanced by the higher hematite surface hydrophobicity and bubble surface tension gradient, which led to more stable froth layer.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1130-1145
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

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