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Articles by H. Gao
Total Records ( 3 ) for H. Gao
  H. Gao , S. Hagg , P. Sjogren , P. C. Lambert , E. Ingelsson and R. M. van Dam
 

Aims

The relation between selenium status and risk of Type 2 diabetes is controversial. We aimed to evaluate associations of serum selenium, a marker of dietary selenium, with measures of glucose metabolism and risk of diabetes.

Methods

We used data from a population-based, longitudinal cohort of 1925 Swedish men who were 50 years old and did not have diabetes at baseline in the 1970s. At baseline, an intravenous glucose tolerance test was performed and, at a follow-up examination after 20 years, an oral glucose tolerance test and a hyperinsulinaemic euglycaemic clamp for the assessment of insulin sensitivity were conducted.

Results

At baseline, the mean (standard deviation) selenium concentration was 75.6 (14.3) μg/l. During 20 years of follow-up, 88 incident cases of diabetes occurred in 1024 participants with follow-up data. Baseline serum selenium levels were not associated with risk of diabetes (odds ratio 1.06; 95% CI 0.83-1.38). Higher selenium levels were associated with lower early insulin response (standardized β -0.08; 95% CI -0.14 to -0.03) at baseline after adjusting for potential confounders, but not with any other measures of β-cell function or insulin sensitivity at baseline or follow-up. The association with early insulin response was non-significant after taking multiple testing into account.

Conclusions

Our results do not support a role of dietary selenium in the development of disturbances in glucose metabolism or diabetes in older individuals.

  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.
 
 
 
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