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Novel Analytical Model of mean temperature and Experimental Research on the Rail Universal Rolling

Chinese Journal of Mechanical Engineering 2009年第3期22卷 376-383页

作者： DONG Yonggang ZHANG Wenzhi SONG Jianfeng College of Mechanical Engineering Yanshan University Qinhuangdao 066004 China

For building the analytical model of mean temperature in rail universal rolling, the cross-section of workpieces and the profile of horizontal roll and vertical roll are simplified rationally. The mean temperature of the web of rail, the top of rail and the base of rail are considered individually. The temperature rises for plastic deformation and friction incorresponding deformation zone, the temperature drop for contact is calculated on the base of variation principle and energy conservation law. Then the mean temperature is obtained. For verifying the theoretical model, the 18 kg/m light rail universal rolling experiments are accomplished in Yanshan University Rolling Laboratory, China and the surface temperature is measured. The surface temperature is not exact enough to express the true temperature and the mean temperature can show the status of the true temperature basically. So the mean temperature can be used to express the true temperature and this theoretical model and its results can be applied as an important reference to control the temperature of rail universal rolling and the heat treatment of the rolled rail.

关键词： mean temperature light rail universal mill rolling experiments surface temperature

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Influences of temperature Regime on Germination of Seed of Wild Soybean(Glycine soja)

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Agricultural Science & Technology 2011年第4期12卷 480-483,540页

作者： LIAO Fang-lei JIANG Wu ZHENG Yue-ping XU Hang-lin LI Li-qing LU Hong-fei College of Chemistry and Life Science Zhejiang Normal University Jinhua 321004

As an important plant species with high protein contents,wild soybean(Glycine soja),has drawn much attention and appeared to be useful for the genetic improvement of soybean *** temperature is one of the numerous environmental factors affecting the germination of most plants,an experimental study was carried out to determine the effect of temperature on germination of wild soybean(***)*** test was conducted by setting up thirty-six constant and alternating temperature regimes,ranging from 5 to 40 ℃(16 h night/8 h day).Responses in germination rate to these temperature regimes were then used to construct a quadratic response surface,giving estimated germination rates with confidence intervals at P ≤ *** results showed that germination capacity was significantly greater while exposed to constant temperatures of 25 ℃,and under the alternating temperature regime the optimum temperature occurred at the 20/25,25/25,25/30 ℃ regime(16 h/8 h)with the amplitude widened from 0 to 5 ℃.Together with regional monthly climate data,these results could be used to improve and promote the cultivation of wild soybean(***),making it available to develop the location-specific optimum seeding time and to apply weed-control treatments.

关键词： Wild soybean(Glycine soja) Diurnal temperature regimes mean temperature Germination rate Quadratic response surface Cultivar

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Study on temperature Changes in Jinan in Recent 30 Years

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Meteorological and Environmental Research 2012年第7期3卷 62-64页

作者： LIU Shu-feng SU Yi ZHAO Yu-cui Jinan Meteorological Bureau in Shandong Jinan 250002China Jiyang Meteorological Bureau in Shandong Jiyang 251400China

[ Objective] The aim was to study temperature changes in Jinan in recent 30 years. [ Method] Using temperature from 1981 to 2010 in six national ground meteorological observation stations in Jinan, and based on linear evaluation method, temperature changes in Jinan in recent 30 years were discussed. [ Result] The mean annual temperature, mean annual highest temperature and mean annual lowest temperature were rising in recent 30 years. mean annual lowest temperature was increasing and its tendency rate was 0.502 ℃/10 a, followed by mean annual temperature whose tendency rate was 0.288℃/10 a. mean annual highest temperature increased most slowly and its tendency rate was 0.144 ℃/10 a. The mean annual lowest temperature rose most significantly in Zhangqiu and its tendency rate was 1. 347℃/10 a. This indicated that the rising mean annual temperature in Jinan was due to the mean annual lowest temperature. The contribution of Zhangqiu City to the temperature changes in the entire Jinan was the largest. For single station, mean annual temperature, mean annual highest temperature and mean annual lowest temperature, temperature rising tendency was small and its contribution was the smallest. [ Conclusion] The study provided theoretical basis for the observation, diagnosis, evaluation and decision-making of climate changes in Jinan.

关键词： mean temperature Changes tendency Jinan China

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