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impact
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     The impact of learning
     中学生数学学习中的自我决定通过影响中学生的学习投入进而影响其数学成绩。
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     Impact and Transform
     冲击与蜕变
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The Hausdorff-Young Theorems of Fourier Analysis and Their Impact
      
Special emphasis is placed upon the development of the proofs of the two Hausdorff-Young inequalities and their impact upon Fourier analysis as a whole, in particular on the M.
      
In this paper, the impact of tariffs and exchange rate on consumption and investment in an open economy of scarcity of capital is analysed.
      
The numerical illustration for the impact of the parameters on the ruin probability is given.
      
Impact of operating costs on investment strategies in new technology adoption with a further new technology anticipated
      
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An attempt to observe the spectrum of doubly excited helium by excitation by electron impact, with energies between 500-600 electron volts, is made without success. This and other failures are discussed by considering of the life times of the doubly excited states. An approximate calculation gives for 2s3s3S a life time of the order 10-15 sec, corresponding to a natural width of the level of the order 1000 cm-1. While this accounts for the absence of a line spectrum of doubly excited helium, it renders...

An attempt to observe the spectrum of doubly excited helium by excitation by electron impact, with energies between 500-600 electron volts, is made without success. This and other failures are discussed by considering of the life times of the doubly excited states. An approximate calculation gives for 2s3s3S a life time of the order 10-15 sec, corresponding to a natural width of the level of the order 1000 cm-1. While this accounts for the absence of a line spectrum of doubly excited helium, it renders the former suggestion that the corona lines may be due to it untenable.

(1)日晕光谱线之来源,至今为未决定之问题。Goudsmit与吴大猷曾假设诸谱线乃由氦气双激起原子所生。过去有人企图用实验方法得到双激起氦原子之光谱,未能成功。但有数种实验室内现象,均有人用此假设以解释之。故作者希望在适当情形下得到双激起氦原子之光谱。 (2)由理论上知用电子撞击法造成双激起之可能性甚小,但此可能性之最大值在电子能为300至600electron volts时故作者企图在人为的此种情形下观察双激起氦原子光谱,但结果未能发现。 (3)此种实验结果可从理论方面予以解释。作者由双激起2s3s~3S状态之计算,知其谱线之宽约为1000cm~(-1),故实验时不能观察因此以前关於日晕光谱之解释,亦成疑问。

Impact tests have been carried out on nodular cast iron in -the cast and forged conditions from -85℃ to 1070℃. The results indicate that nodular cast iron of predominantly ferritic matrix possesses two brittle temperature ranges (below 20℃ and between 550 and 700℃), and one comparatively more ductile range (between 850℃ and 1050℃).

本文描述高温冲击实验的技术,以及由-85℃至1070℃的铸态和锻造后的球墨铸铁的冲击性能。研究结果找到了基体主要为铁素体的球墨铸铁的两个变脆温度范围(-20℃以下和550℃至700℃之间)和一个比较具有韧性的温度范围(850℃与1050℃之间)。在这些温度范围内,曾考查试样的断口情况和断裂时的弯曲角度,并与其基体组织的变化相联系,进行讨论。最后,本文指出研究结果在球墨铸铁的应用上所起的作用,以及在球墨铸铁热加工时对于选择热加工温度的意义。

The softening point and Young's modulus of polymethylmethacrylate at low temperature with various contents of dibutyl phthalate have been measured by using a consistometer and a dilatometer respectively. The relationship between the molar con- centration of dibutyl phthalate, N, and the softening point, T, can be expressed by the equation T=112-947N. An explanation for the difference between the coefficient 947 and the value 228-232, previously obtained by Zhurkov, is suggested. The addition of 1% or more dibutyl...

The softening point and Young's modulus of polymethylmethacrylate at low temperature with various contents of dibutyl phthalate have been measured by using a consistometer and a dilatometer respectively. The relationship between the molar con- centration of dibutyl phthalate, N, and the softening point, T, can be expressed by the equation T=112-947N. An explanation for the difference between the coefficient 947 and the value 228-232, previously obtained by Zhurkov, is suggested. The addition of 1% or more dibutyl phthalate substantially improves the low temper- ature impact strength of polymethylmethacrylate, but it shows no appreciable change in Young's modulus at room temperature with 1-5% dilbuytl phthalate.

測定了不同苯二酸二丁酯含量的聚甲基丙烯酸甲酯的軟化温度、二級轉變温度和低温彈性模數,得出苯二酸二丁酯含量和軟化温度的關係式:T=112-947N。並從低温彈性模數說明添加苯二酸二丁酯後改進了聚甲基丙烯酸甲酯的低温度衝擊強度。

 
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