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Early Childhood Kindergarten Programs in China: Issues of Access and Funding
Zeng Yaqin,Berenice Nyland,Zeng Xiaodong 환태평양유아교육연구학회 2011 Asia-Pacific journal of research in early childhoo Vol.5 No.1
China has a complex system of multiple types of preschool provision, different funding models, a rural-urban divide and a diverse population in relation to place of origin, language dialects and socio economic status. In this paper we explore the complex situation of preschool provision and implications for policy makers in China. As the provision of preschool education is increasingly privatized there is a concern that children from low income families may not have access to quality early care and education services. Affordability and access to education in the early years has become a major concern of governments concerned about equity and the development of human capital. Case studies have been carried out in Beijing, as a developed urban centre and in Yinchuan, as a rural centre in the west of China. The data presented examines the relationship between types of service, fees charged and the income of families who access these services.
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Design optimization and development of SMC composite tray
Cun-fei Wang,Zeng-fu Yang,Chengwang Shi,Xiaodong Li,Xu-feng Zhang 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.2
In the engineering application, trays are easy to break down to result in anchorage failure in the composite anchoring systems. Therefore, the research carried out the force analysis with mechanics of materials to observe the main stress concentration anddeformation of the tray. From the findings of the force analysis, the structure and key parameters of the tray were optimizedwith reference of the existing tray design. Besides, the study turns to the finite element software to simulate and analyze thetray. The results manifest that tray failure during the support mainly results from the expansion and deformation of the taperhole squeezed by the nut, which causes the tray taper hole to rupture and crackle extend, thus leading to its crack. What’smore, the tray breaks for the compression of the tray edge by the surrounding rock. The maximum deformation at the largeend of the optimized tray tapered hole was reduced from 33.8 mm to 4.7 mm, approximately 86% with the shear stress reducedfrom 781.67 Mpa to 258.83 Mpa, about 66.8%. Using Sheet Molding Compound (SMC) to mould trays with new structure andconducting the test of tray bearing capacity, it can be found that its bearing capacity is up to 250 KN. After the taper hole ofthe tray is locally strengthened, its bearing capacity is increased to 304 KN.
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A Novel 3-D Imaging Configuration Exploiting Synthetic Aperture Ladar
Liang Guo,Yinli Huang,Xiaozhen Li,Xiaodong Zeng,Yu Tang,Mengdao Xing 한국광학회 2017 Current Optics and Photonics Vol.1 No.6
Traditional three-dimensional (3-D) laser imaging systems are based on real aperture imaging technology,whose resolution decreases as the range increases. In this paper, we develop a novel 3-D imaging techniquebased on the synthetic aperture technology in which the imaging resolution is significantly improved anddoes not degrade with the increase of the range. We consider an imaging laser radar (ladar) system usingthe floodlight transmitting mode and multi-beam receiving mode. High 3-D imaging resolutions areachieved by matched filtering the linear frequency modulated (LFM) signals respectively in range, syntheticaperture along-track, and the real aperture across-track. In this paper, a novel 3-D imaging signal modelis given first. Because of the motion during the transmission of a sweep, the Doppler shift induced bythe continuous motion is taken into account. And then, a proper algorithm for the 3-D imaging geometryis given. Finally, simulation results validate the effectiveness of the proposed technique.
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