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New results are obtained on the excess and overcompleteness of Gabor frames, on the relationship between frame bounds and density, and on the structure of the dual frame of an irregular Gabor frame.


The relationship between multiresolution analysis and filtering schemes is a well known facet of wavelet theory.


The relationship between harmonic analysis on GF(p?) and harmonic analysis on its subfields, is studied.


The relationship between the topochemical indices and antiallergic activity of 4oxopyrimido[4,5b]quinolines was investigated.


The relationship between the topochemical indices and poly(ADPribose) polymerase inhibitory activity of indole1ones has been investigated.

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 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=112947N. An explanation for the difference between the coefficient 947 and the value 228232, previously obtained by Zhurkov, is suggested. The addition of... 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=112947N. An explanation for the difference between the coefficient 947 and the value 228232, 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 15% 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=112947N。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。  The present study was undertaken with one dog, on whose cortex, at the region of the sigmoid gyrus, were imbedded two permanent electrodes known respectively as electrode A and electrode B. Under stimulation, electrode A gives movement of the left hind leg, and electrode B elicits movement of the toes of the left front leg.The main aim of the experiment is to determine the minimal strength in voltage for eliciting the first appreciable motor response, when the frequency of the stimulating current is under control.... The present study was undertaken with one dog, on whose cortex, at the region of the sigmoid gyrus, were imbedded two permanent electrodes known respectively as electrode A and electrode B. Under stimulation, electrode A gives movement of the left hind leg, and electrode B elicits movement of the toes of the left front leg.The main aim of the experiment is to determine the minimal strength in voltage for eliciting the first appreciable motor response, when the frequency of the stimulating current is under control. With an ordinary audiooscillator to administer the stimulus frequencies, the range of frequencies utilized is 20—20,000 cycles.For the same frequencies, the minimal voltage for eliciting the motor response varies considerably from one sitting to another (see Table 1), but within the same sitting the same frequencies, even when repeated with many other frequencie intervening, require closely similar minimal voltages. Furthermore, a clear trend is always present in the relationship between the frequency of the stimulating. current and the minimal voltage necessary for eliciting the motor response, i. e., within the range of frequencies used (20—20,000), the middle frequencies need farsmaller stimulus strength in voltage than either the lower or the higher ones to elicit the same motor response.It was found that the minimal effective voltage is lowest for the 300—1,000. cycles region. Frequencies lower than 300 or higher than 1,000 need higher voltage. Furthermore, frequencies from 300 downwards and from 1,000 upwards are accompanied by progressively higher voltage. Electrodes A and B yield closely similar results (see Table 3 and Fig. 2). Thus, the frequencies from 300 to 1,000 cycles may be considered as possessing the most effective stimulus value.Besides the definite frequencyvoltage relationship just mentioned, frequency affects the type of motor response as that frequencies of 100 and below 100 no longer elicit the regular response of the leg or the toes alone, but give rise to neck. movement in addition. Neck movement becomes eventually the only motor response to frequencies 50—20. With electrode A the above mentioned phenomenon. appeared with great regularity (see Table 4).When the experiment was over, the dog was killed and its brain examined histologically. It is seen that both electrodes are in the sigmoid gyrus of the right hemisphere, but they enter into different depths. Electrode A penetrates into between layer Ⅴ and layer Ⅵ, while electrode B penetrates only into layer (see Figs. 4 and 5).  在本实驗中在一只小狗的乙狀回皮質中埋了兩个固定的电極,分別地利用这兩个电極,在狗的正常狀态下,試驗了各种頻率的电流,發現中間頻率(300—1000周)的电流引起运动反应所必需的电压最低,自300周以下和1000周以上,引起运动反应的最 低伏特值逐步增加。 实驗还証明,直接作用于乙狀回皮質上一定点的电流当其頻率降低到某种程度时,可以使运动反应的性質改变。  Direct selenium dehydrogenation of sipeimine gave two basic products. The one has an empirical formula C_(26)H_(31)N (Ⅰ), m.p. 175° and gives a picrate, m.p. 212°. The other has an empirical formula C_(26)H_(25)N (Ⅱ), m.p. 228°, giving a picrate m.p. 224°, a methiodide, m.p. 276°(decomp.), an octahydroderivative, C_(26)H_(33)N, m.p. 146°, and a ketoderivative, C_(26)H_(23)ON, m.p. 269°. The second basic compound has been proved to be identical with veranthridine, obtained by Jacobs from veratrum alkaloid,... Direct selenium dehydrogenation of sipeimine gave two basic products. The one has an empirical formula C_(26)H_(31)N (Ⅰ), m.p. 175° and gives a picrate, m.p. 212°. The other has an empirical formula C_(26)H_(25)N (Ⅱ), m.p. 228°, giving a picrate m.p. 224°, a methiodide, m.p. 276°(decomp.), an octahydroderivative, C_(26)H_(33)N, m.p. 146°, and a ketoderivative, C_(26)H_(23)ON, m.p. 269°. The second basic compound has been proved to be identical with veranthridine, obtained by Jacobs from veratrum alkaloid, cevine, by their ultraviolet absorption spectra, melting points, and their corresponding derivatives. Thus the relationship between fritillaria and veratrum alkaloids is established. The present results further strongly support our earlier proposed skeleton for sipeimine and ensure the 20methyl position in (Ⅴ).C_(26)H_(31)N is probably a hexahydroderivative of veranthridine.  西貝素用硒脫氫,得下列二種鹼性產物,(1)C_(26)H_(31)N(Ⅰ),熔點175°,苦味酸鹽,熔點212°。(2)C_(26)H_(25)N(Ⅱ),熔點228°,苦味酸鹽,熔點224°;碘甲季銨鹽,熔點276°(分解);氧化產物C_(26)H_(23)ON(Ⅲ),熔點269°;氫化產物C_(26)H_(33)N(Ⅳ),熔點146°。證明Ⅱ与veranthridine為同一物,因此溝通了貝母植物鹼與藜蘆植物鹼的關係。並進一步證明了西貝素的骨架(Ⅴ),及確定了20甲基的位置。C_(26)H_(31)N可能是veranthridine六氫衍生物。   << 更多相关文摘 
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