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恒定温度是什么意思

浏览次数: | 2017-09-19 15:05

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  制备方法是在pH为2.0和温度为40 ℃的条件下,向重晶石的悬浮液中滴加一定浓度的SnCl2、SnCl4和NH4F的盐酸混合液,为了保持溶液的pH值恒定,同时滴加一定浓度的NaOH溶液,待混合液滴加完后,再继续搅拌30 min,过滤、洗涤和干燥,并在300 ℃下灼烧1 h。得到一种电阻率为7.7 Ω。m的白色导电颜料。

  To a dispersion of 10 g barite in water at pH2.0 and 40 ℃, a mixed solution of SnCl4, SnCl2, and NH4F in hydrochloric acid was added dropwise together with a solution of NaOH to maintain a constant pH, stirred another 30 minutes, filtered and the precipitate was washed, dried and calcined at 300 ℃ for an hour to give a white pigment with electrical resistivity of 7.7 Ω.m.

  结果表明:变黄阶段不同温湿度组合对均价及上等烟率的影响基本相似,温度对二者的影响大于相对湿度;均价及上等烟率随温度或相对湿度的升高而均呈迅速上升→缓慢上升→缓慢下降→迅速下降的变化趋势,均价的峰值分别出现在38.0℃和87.0%,上等烟率的峰值分别出现在37.6℃和86.5%;此外研究结果还得出:当温度恒定在37.5℃~ 38.0℃,相对湿度恒定在85.0%~ 88.0%,干湿球差为1.5℃~ 2.0℃时,均价、上等烟率分别可达到10元/kg和40%以上。

  The result showed that the influence of temperature and RH on average price and rate of first class of flue-cured tobacco was similar, which showed a trend of parabola curve with temperature or RH increasing. The maximum value of average price occur at 38.0℃ and 87.0%, the maximum value of the rate of first class occur at 37.6℃ and 86.5%. The result also showed that when the temperature or RH was in the range of 37.5℃ to 38.0℃ or 85.0% to 88.0%, psychrometric difference was 1.5~2.0℃, the average price and rate of first class would exceed 10 yuan per kg and 40% respectively.

  结果表明:(1)低噪声源跟随电路可有效测量PVDF 薄膜输出;

  (2)PVDF压电薄膜的压电系数D33对温度很敏感;

  (3)D33值在加载初始阶段波动很大,所以实际应用中应给PVDF提供一个预压载荷,以确保有一恒定的压电系数D33;

  (4)当压载荷沿倾斜方向作用在PVDF 表面时,由于有剪切力作用,D33 值会随着倾斜角的变化发生显著改变;

  (5)PVDF 薄膜具有很宽的频响,更适用于测定不同载荷条件下的侵彻或冲击等动态载荷。

  The results show that:(1)the low-noise source-follower circuit can be effectively used to measure the output of PVDF thin film; (2)the piezoelectric coefficient D33 of the PVDF is very sensitive on temperatures; (3)the value of D33 intensively fluctuate in initial loading stage, this means that a pre-load is needed in practice application to keep a constant piezoelectric coefficient D33 of the PVDF; (4)when the compressive load is imposed on the surface of the PVDF along a incline direction, D33 value is obvious changed with changing incline angle, and(5)the frequency bandwidth of the PVDF thin film is very wide, it is more suitable to measure strike or impact loading at various loading conditions.

  热中性区是环境的温度范围,在这个温度范围内,内温动物仅使用一个最小的代谢率以维持恒定的体温。

  Zone is the range of enmironmental temperatures in which an endotherm has only to exert a minimum metabolic effort in order to maintain a constant body temperature.

  热中性区是环境的温度范围,在这个温度范围内,内温动物仅使用一个最小的代谢率以维持恒定的体温。

  The thermoneutral zone is the range of enmironmental temperatures in which an endotherm has only to exert a minimum metabolic effort in order to maintain a constant body temperature.


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  • 此文关键词:温度冲击测试,温度冲击试验,温度冲击试验箱