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Articles by Z. Deng
Total Records ( 4 ) for Z. Deng
  X. Zou , Z. Deng , M. Ge , G. Dick , W. Jiang and J. Liu
  In order to obtain crustal deformations of higher spatial resolution, existing GPS networks must be densified. This densification can be carried out using single-frequency receivers at moderate costs. However, ionospheric delay handling is required in the data processing. We adapt the Satellite-specific Epoch-differenced Ionospheric Delay model (SEID) for GPS networks with mixed single- and dual-frequency receivers. The SEID model is modified to utilize the observations from the three nearest dual-frequency reference stations in order to avoid contaminations from more remote stations. As data of only three stations are used, an efficient missing data constructing approach with polynomial fitting is implemented to minimize data losses. Data from large scale reference networks extended with single-frequency receivers can now be processed, based on the adapted SEID model. A new data processing scheme is developed in order to make use of existing GPS data processing software packages without any modifications. This processing scheme is evaluated using a sub-network of the German SAPOS network. The results verify that the new scheme provides an efficient way to densify existing GPS networks with single-frequency receivers.
  X. Yu , H. Gao and Z. Deng
  This research analysis mechanism of multi-wheel corresponding driven and steady driven of lunar rover with 6 wheels and rocker bogie based on its characterization of mechanical configuration and based on principle of traditional multi-wheels driven, using the CAN bus, we construct a distributed motion control network as a kernel of whole control system of rover. The bus network motion control unit adopts uniform interface, uniform hardware body and this unit has characteristics of modularization, easy to reconfiguration and high integration. The distributed motion control system based on this unit can decrease the complexity of wiring of robot and improve flexibility of programming of main computer of rover. Using wheel operation modes, motion performance of rover is analyzed in 3 different driving modes on smooth and rough terrain. According to the mechanical configuration of rover, operations modes of wheel and principle of speed matching of wheels, we presents a adaptive coordinated control algorithm of multi-wheels independent driven on rough terrain. Through the experiments of obstacle overcoming, climbing, moving on cross-hill in soft soil and spot turning, it shows this rover has good transportation performance, the distributed motion control system base CAN bus has a good performance and high reliability and the adaptive coordinated control algorithm is validity.
  J. Liu , H. Gao and Z. Deng
  For optimizing wheel configuration of planetary rover, the effect analysis of straight grousers on motion performance of a small rigid wheel was conducted in loose sand bin. All tests were done at a free wheel sinkage and 0 to 60% slip in a single-wheel test bed. By the qualitative analysis and comparisons of tractive and steering performance between smooth wheel and the wheels with different straight grousers, the results show that the grouser height and slip more significantly influence the motion performance than grouser spacing and thickness. Through applying the evaluation indexes of tractive and steering performance to the experimental results, the preferable grouser parameters for actual applications are 15° grouser spacing, 10 mm grouser height and 1.5 mm grouser thickness; the optimum value of wheel slip is 13% for the similar sand used in the experiment.
  H.L. Wan , L.P. Zhang , M.A. Brown , X.J. Wu , J.H. Wang , L. Yang , Z. Deng and J.P. Wu
  Meat from yak (Bos grunniens) is a primary staple in diets of people in western China. Yak meat has low-fat content, high protein and good amino acid and fatty acid profiles. However, meat from yak may be less tender than meat from Bos taurus cattle. Gannan Black yaks (n = 181) were used to investigate the effects of age at harvest and aging days on meat quality characteristics of M. longissimus dorsi. Yaks were harvested at 2, 3 and 4 year of age and muscles of each yak carcass were aged for 0, 1, 3, 7, 14 or 21 days at 4°C and frozen at -20°C until analyzed. Age at harvest affected shear force and percentage fat, protein and moisture (p<0.05). Aging days affected shear force, retort cooking loss, pressing loss, moist cooking loss, pH, percentage fat, moisture (p<0.01) and protein (p<0.10). There were interactions between aging days and age at harvest for shear force, moisture and protein (p<0.01). Aging days appeared to have a greater effect on shear force than age at harvest and tended to moderate the age at harvest effect on shear force. When cooked in retortable bags, cooking loss decreased until 3 days postmortem after which it remained relatively constant. When steam cooked, meat aged 7 days had the lowest cooking loss (p<0.05). Pressing loss decreased until 3 days postmortem then remained relatively constant. After thawing, pH decreased during the 21 days period of postmortem aging with the greatest decline in the first 24 h (6.68-5.73 from 2-24 h postmortem). Results suggest that aging yak meat 7 days is sufficient for acceptable tenderness and meat quality.
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