Wyniki wyszukiwania - BazTech

1

Depth-resolved measurement of the compression displacement fields on the front and rear surfaces of an epoxy sample

Zhang W., Dong B., Zhang W., He Z., Xie S., Zhou Y.

Optica Applicata

|

2018

|

Vol. 48, nr 2

311--323

EN

Compression is one of the typical parameters measured in material mechanics. In this research, the compression displacement fields on the front and rear surfaces of an epoxy sample are measured by using a tilt depth-resolved wavenumber-scanning Michelson interferometer. The light source is a distributed feedback laser diode, the wavenumber of which can be modulated to about 1.017 × 104 m–1 by the temperature without mode hopping. A random-sampling Fourier transform is designed to evaluate the phase differences before and after the applied loads. Experimental results show that the depth-resolved measurement of the compression displacement field is of high accuracy. It can be used to analyze force propagation inside resin-based composites.

2

Enhancing light harvesting of organic solar cells by using hybrid microlenses

Xiao X, Zhang Z, Xie S, Liu Y, Hu D, Du J

Optica Applicata

|

2015

|

Vol. 45, nr 1

89—100

EN

Organic solar cells have drawn intense attentions in recent years due to their inherent advantages. But the relatively low power conversion efficiency is the main obstacle in the way of organic solar cell commercialization. One of the main reasons that limit the power conversion efficiency is the mismatch between electrical transmission properties and light absorption properties in an organic active layer. In this work, a highly efficient light trapping scheme with a hybrid microlens array is proposed to resolve this contradiction. This structure can achieve broadband absorption enhancement in the spectrum of interest by chromatic aberration correction and hole parameter adjustment. And the light trapping element can be separated from cells to avoid direct contact with an organic layer that may cause electrical defects. Moreover, it is also compatible with low cost manufacturing technologies.

3

Phytoremediation of phenol using Polygonum orientale and its antioxidative response

Wang K., Cai J., Xie S., Feng J., Wang T.

Archives of Environmental Protection

|

2015

|

Vol. 41, no. 3

39--46

EN

Polygonum orientale with beautiful red flowers can be found as one dominant species in the vicinity of most water bodies and wetlands in China. However, its phytoremediation potential has not been sufficiently explored because little is known about its resistance to inorganic or organic pollutants. We investigated P. orientale response to low and moderate levels of phenol stress (≤ 80 mg L-1). Endpoints included phenol tolerance of P. orientale and the removal of the pollutant, antioxidant enzyme activities, damage to the cell membrane, osmotic regulators and photosynthetic pigments. In plant leaves, phenol stress significantly increased the activities of peroxidase (POD) and catalase (CAT), as well as the contents of proline, soluble sugars and carotenoids, whereas superoxide dismutase (SOD), H2O2 and electrolyte leakage (EL) levels remained unaltered. On the other hand, there were significant decreases of soluble protein and chlorophyll contents. We demonstrated that, in combination with phenol tolerance and its removal, P. orientale has efficient protection mechanisms against phenol-induced oxidative damage (≤ 80 mg L-1). We propose that P. orientale could be used as an alternative and interesting material in the phytoremediation of phenol.

4

Development of Robot Bionic Eye with Spherical Parallel Manipulator Based on Oculomotor Control Model

Li H., Luo J., Chen J., Liu Z., Xie S.

Przegląd Elektrotechniczny

|

2012

|

R. 88, nr 1b

1-7

EN

Vision System is important for autonomous robot. In this paper, a robot bionic vision system, which has the function of the human eye movements, is developed to solve the problem of vision instability during robot working. Firstly, according to the eyeball structure and eye movement characteristics, the mechanism of the bionic eye with three degree of freedom (DOF) is designed by using a spherical parallel manipulator. Because it will be applied in a rough environment, natural frequency of vibration and the maximum deformation of the bionic eye mechanism is gained based on finite-element method(FEM). Then, the control system of the bionic vision is established based on a oculomotor control model, which can compensate the visual error caused by the dynamic changes of the robot attitude and tracking target position. In addition, a bionic vision embedded system with a standard video data interface is developed. Finally, some simulation and physical robot experiments are conducted in harsh environments, and the test results confirm the effectiveness of this bionic vision system. It is also shown that the controller based on oculomotor control model is robust even with external disturbance.

PL

Przedstawiono bioniczny system spełniający funkcję ludzkiego oka. Sztuczne oko porusza się w przestrzeni trójwymiarowej w uwzględnieniem możliwych wibracji. System sterowania może kompensować błędy wynikające z ruchu robota. Przedstqwiono wyniki eksperymentalnego badania w trudnych warunkach pracy.