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1
Predicting spatial distribution of plant functional traits in a forest-steppe zone
100%
Fan S. , Zhang Z.
|
2021
|
tom 69
|
nr 1
2
Numerical simulation of solid-fluid 2-phaseflow of cutting system for cutter suction dredgers
80%
Zhang M. , Fan S. , Zhua H. , Han S.
Polish Maritime Research
|
2018
|
tom 25
|
nr Special Issue S2
EN
The study of the flow characteristics of the solid-fluid two phase flow in the cutter suction dredger is very important for exploring the slurry formation mechanism and optimizing the operational parameters. In this study, standard k-ε model and Multiple Reference Frame are applied to numerically simulate flow field in and around the cutting system, then with the steady convergent result of the simulation as the initial condition, Discrete Phase Mode is used to solve the particle motion equation by fully coupling the continuous phase and the particles . The influence of suction flow velocity and cutter’s rotating speed on particles suction are analyzed, and effectively suctioned particles numbers are also quantitatively studied. The simulation result shows that the DPM model is able to simulate the movement of particles in and around the cutter suction dredger’s cutting system, in the fluid flow filed velocity vector and pressure distribution on different planes show different characteristics, and under higher suction velocity and lower cutter rotating speed more particles are suctioned into the suction inlet. The results can help better understand flow characteristics of solid-fluid 2-phase-flow of cutter suction dredger’s cutting system, and provide theoretical support for relative system design and operational parameters optimization
3
Content available Numerical simulation of solid-fluid 2-phaseflow of cutting system for cutter suction dredgers
80%
Zhang M. , Fan S. , Zhua H. , Han S.
Polish Maritime Research
|
2018
|
tom S 2
117--124
EN
The study of the flow characteristics of the solid-fluid two phase flow in the cutter suction dredger is very important for exploring the slurry formation mechanism and optimizing the operational parameters. In this study, standard k-ε model and Multiple Reference Frame are applied to numerically simulate flow field in and around the cutting system, then with the steady convergent result of the simulation as the initial condition, Discrete Phase Mode is used to solve the particle motion equation by fully coupling the continuous phase and the particles . The influence of suction flow velocity and cutter’s rotating speed on particles suction are analyzed, and effectively suctioned particles numbers are also quantitatively studied. The simulation result shows that the DPM model is able to simulate the movement of particles in and around the cutter suction dredger’s cutting system, in the fluid flow filed velocity vector and pressure distribution on different planes show different characteristics, and under higher suction velocity and lower cutter rotating speed more particles are suctioned into the suction inlet. The results can help better understand flow characteristics of solidfluid 2-phase-flow of cutter suction dredger’s cutting system, and provide theoretical support for relative system design and operational parameters optimization.
4
Content available Mixed leaf litter decomposition and N, P release with a focus on Phyllostachys edulis (Carriere) J. Houz. forest in subtropical southeastern China
70%
Shi L. , Fan S. , Jiang Z. , Qi L. , Liu G.
Acta Societatis Botanicorum Poloniae
|
2015
|
tom 84
|
nr 2
EN
As an important non-wood forest product and wood substitute, Moso bamboo grows extremely rapidly and hence acquires large quantities of nutrients from the soil. With regard to litter decomposition, N and P release in Moso bamboo forests is undoubtedly important; however, to date, no comprehensive analysis has been conducted. Here, we chose two dominant species (i.e., Cunninghamia lanceolata and Phoebe bournei), in addition to Moso bamboo, which are widely distributed in subtropical southeastern China, and created five leaf litter mixtures (PE100, PE80PB20, PE80CL20, PE50PB50 and PE50CL50) to investigate species effects on leaf litter decomposition and nutrient release (N and P) via the litterbag method. Over a one-year incubation experiment, mass loss varied significantly with litter type (P < 0.05). The litter mixtures containing the higher proportions (>80%) of Moso bamboo decomposed faster; the remaining litter compositions followed Olson's decay mode well (R2 > 0.94, P < 0.001). N and P had different patterns of release; overall, N showed great temporal variation, while P was released from the litter continually. The mixture of Moso bamboo and Phoebe bournei (PE80PB20 and PE50PB50) showed significantly faster P release compared to the other three types, but there was no significant difference in N release. Litter decomposition and P release were related to initial litter C/N ratio, C/P ratio, and/or C content, while no significant relationship between N release and initial stoichiometric ratios was found. The Moso bamboo-Phoebe bournei (i.e., bamboo-broadleaved) mixture appeared to be the best choice for nutrient return and thus productivity and maintenance of Moso bamboo in this region.
5
Content available A super depth of field height measurement based on local disparity
61%
Cui L. , Liu Y. , Yu M. , Jiang G. , Fan S. , Wang Y.
Optica Applicata
|
2015
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tom Vol. 45, nr 2
205--214
EN
A super depth of field height measurement method is proposed to measure the object height with the optical stereoscopic microscope. The quasi-Euclidean epipolar rectification algorithm is utilized on the original stereoimage to obtain rectified stereoimages and calibrate two camera parameters. Then, feature points are obtained by the SURF (speed up robust feature) algorithm and their corresponding disparities are calculated. The disparity-depth of field curve is fitted by combining the step height values of a stepper motor. Moreover, through local disparity value got from feature points on the object, the relative shift height is calculated through regression analysis. Finally, according to binocular vision geometry, the thickness of the object can be calculated. Experimental results show that the measurement error in Z direction is from 1.51% to 7.71%, which indicates that the proposed method is able to measure the height of a microobject beyond depth of field within a tolerant error.
6
Content available Disparity servoing based fast autofocusing method for stereomicroscope
61%
Liu Y. , Yu M. , Cui L. , Jiang G. , Wang G. , Fan S.
Optica Applicata
|
2016
|
tom Vol. 46, nr 4
651--663
EN
A disparity servoing based fast autofocusing method is proposed for stereomicroscopes according to linear relationship between the disparity change in stereomicroscopic images and the move distance of a motorized translation stage. For a certain stereomicroscope, the calibration of a disparity range of clear images at each magnification is implemented offline. After that, the disparity of the stereomicroscopic image is used as an index to represent the sharpness of an arbitrary image. If the disparity does not satisfy the requirement, move steps and direction of a step motor are calculated by utilizing the linear relationship between the disparity change and the move distance of the stage. The iteration will be continued until the disparity of the captured stereomicroscopic image approximates to the clearest disparity. The experimental results show that the proposed method only requires a few iterations and less time to reach the focus position, and the disparity error is less than 0.5 pixel.
7
Content available Moving-aperture-based three-dimensional micro-measurement system
61%
Fan S. , Yu M. , Jiang G. , Wang Y. , Wang W. , Li W.
Optica Applicata
|
2018
|
tom Vol. 48, nr 4
533--547
EN
To overcome the depth-of-field limitation of an optical microscope image, a three-dimensional measurement method with a superior depth-of-field is proposed. In the proposed method, light-field information of different angles is obtained by moving the aperture and the three-dimensional scene is reconstructed by using a computational reconstruction technology. First, stereo matching of different aperture position images is performed to obtain the multi-aperture imaging deviation. The focal plane moving distance is thereby estimated. Then, the relational expression between the image coordinates and the focal plane moving distance is determined according to the image coordinates. Two dimensional coordinates of the space point are obtained by the expression coefficients. Finally, the depth coordinates are computed, and three-dimensional reconstruction of the spatial points is completed. Experiments of three-dimensional measurements of the calibration board with different angles and circuit boards are conducted. The results show that the maximum error of the distance measurement is controlled into 0.84%, and the maximum angle measurement error is controlled into 4.56%.
8
Effects of ultrasound on vascular endothelial growth factor in cartilage, synovial fluid, and synovium in rabbit knee osteoarthritis
61%
Luo Q. , Fan S. , Li R. , Ouyang Z. , Liu Z. , Lin Q.
Acta Biochimica Polonica
|
2020
|
tom 67
|
nr 3
9
Content available remote EMC Requirements and Test Methods for Light Emitting Diodes
61%
Bao X. , Fan S. , Pan J. , Liu M. , Liu M. , Shen H.
Przegląd Elektrotechniczny
|
2012
|
tom R. 88, nr 10a
269-272
EN
EMC test is important for the reliability improvement of LEDs and their application products. This paper introduces the EMC requirements for LED chips, LED devices and LED application products, focusing on electrostatic discharge, electrical fast transient, thunder stroke surge, voltage dip, conductive interference and radio frequency interference. Corresponding test methods are also given. These EMC requirements and test methods are valuable for LED manufacturer and end users.
PL
W artykule przedstawiono wymagania EMC w stosunku do LEDów oraz urządzeń z nimi współpracujących, takich jak wyładowania elektrostatyczne, stany przejściowe, skoki napięcia, interferencje. Przedstawiono odpowiednie metody badawcze. (Wymagania elektrokompatybilności i metody badania układów LED)
10
Transcriptome analysis of salt stress response in halophyte Atriplex centralasiatica leaves
61%
Yao J. , Zhang X. , Wang N. , Cui Y. , Zhang L. , Fan S.
Acta Physiologiae Plantarum
|
2020
|
tom 42
|
nr 01
11
Optimization of culturing conditions for production of somatic embryos and lignins of Schisandra chinensis (Turcz.) Baill
41%
Sun D. , Wang Z. , Yu Y. , Li C. , Qin H. , Xu P. , Zhao Y. , Liu Y. , Yang Y. , Fan S. , Ai J.
Acta Physiologiae Plantarum
|
2018
|
tom 40
|
nr 09
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