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   [ damping ] 的翻译结果: 查询用时:0.39秒
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damping
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    Damping Rubber
    阻尼橡胶
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    DAMPING ALLOYS
    减振合金
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Formulas are derived for the solution of the transient currents of dissipative low-pass T-type electric wave filters. Oscillograms taken by cathode ray oscillograph for d-c. and a-c. cases are found to agree with results calculated from these formulas. From these calculations, the following conclusions are derived. When terminating resistance is gradually increased from O, the damping constants of the sine terms begin to differ from each other, ranging in decreasing magnitude from term of the lowest frequency...

Formulas are derived for the solution of the transient currents of dissipative low-pass T-type electric wave filters. Oscillograms taken by cathode ray oscillograph for d-c. and a-c. cases are found to agree with results calculated from these formulas. From these calculations, the following conclusions are derived. When terminating resistance is gradually increased from O, the damping constants of the sine terms begin to differ from each other, ranging in decreasing magnitude from term of the lowest frequency to the last term of cut-off frequency. Hence the transient is ultimately of the cut-off frequency. At cut-off frequency, this constant is near to but greater than R/2L. For each increase of section, there is introduced an additional sine term with smaller damping constant. Therefore transients die out faster in filters of smaller number of sections. Since transient amplitudes are of the same order of magnitude before and after cut-off, filtering property only exists in the steady states.

此篇先推求收端加电阻时,低频滤波器瞬流之公式。依此公式算出之图与用阴极光示波器映出之曲线相符合。自推算之结果,可得下列结论: (一)在滤波器收端电阻渐加时,瞬流各项之挫率渐互异,其数量由低频项至隔阻频之项顺序渐减;其最小数仍比收端无电阻时之挫率(R/2L)为大。故瞬流终必变为隔阻频之电流;而较收端无电阻时易于消减。 (二)当滤波器增加一段时,瞬流之项数亦加一。所加项之挫率皆比前有者为小。故少段滤波器之瞬流易于消减。 (三)在隔阻频後瞬流之数量与在其前者相彷恒较隔阻频後之安定数量大数十倍,故滤波之特性仅能见之于安定状态。

Formulas are derived for the solution of the transient currents of resistance-terminated dissipative π-type low-pass, T- and π-type high-pass electric wave filters. Oseillograms taken by cathode ray oscillograph for d-c. and a-c. cases are found to agree with the results calculated from these formulas. From these calculations, the following conclusions are derived: (1) When the terminating resistance is gradually increased from 0, the damping constants of the damped sine terms begin to differ greatly from...

Formulas are derived for the solution of the transient currents of resistance-terminated dissipative π-type low-pass, T- and π-type high-pass electric wave filters. Oseillograms taken by cathode ray oscillograph for d-c. and a-c. cases are found to agree with the results calculated from these formulas. From these calculations, the following conclusions are derived: (1) When the terminating resistance is gradually increased from 0, the damping constants of the damped sine terms begin to differ greatly from each other, ranging in decreasing magnitudes from the first damped sine term to the last term of cut-off frequency. Hence the transient is ultimately of the cut-off frequency. At the cut-off frequency, this constant is greater than the corresponding constant (R/2L) when the termination is absent. (2) For each increase of one section, there is introduced an additional damped sine term with smaller damping constants. Therefore transients die out faster in filters of small no. of sections. (3) With the same network constants, the damping constants of π-type filters are greater than the corresponding values of T-type filters. As a result, transients die out faster in π-type filters. (4) The amplitudes of the transient terms in the attenuation and transmission ranges are of the same order of magnitude, and the filtering property only exists in the steady states. (5) The cut-off frequency of the π-type filters varies with the no. of sections used. When only two sections of low, or, high-pass filter are used, the variation amounts to nearly 26 per cent from the theoretical value.

此篇先推求收端加电阻时,低频与高频滤波器瞬流之公式依此公式算出之图与用阴极光示波器映出之曲线相符合。自推算之结果,可得下列结论: (一)在滤波器收端电阻渐加时,瞬流各项之挫率渐渐互异其数量,由第一挫波项至最後隔阻频项,顺序渐减;其最小数仍比收端无电阻时之挫率(约等于R/2L)为大。故瞬流终必变为隔阻频之电流,而较收端无电阻时易于消灭。 (二)当滤波器增加一段时,瞬流之项数亦加一,所加项之挫率皆比前有者为小,故少段滤波器之瞬流易于消灭。 (三)在π式滤波器中,其瞬流各项之挫率恒较同一电恒数T式滤波器中之相当项之挫率为大故在π式滤波器中,瞬流消灭较易。 (四)在隔阻频后瞬流之数量与在其前者相彷,恒较隔阻频后之安定数量大数十倍,故滤波器之特性仅能见之于安定状态之下。 (五)π式滤波器之隔阻电频随所用之段数而变化在二段之滤波器中,此变化数为最高,其数与理想之数相差百分之二十六。

Black rot of yam bean has been collected from the market in certain localities of Yunnan Province.The diseased tuber-root is characterized by the black dis- coloration of the interior tissues without conspicuous external symptoms.The evidence at hand indicates that the infection takes place before the digging time, through the dead main tap roots.It is unlikely that it works in the storage. Hundreds of isolations were made from the diseased tuber-roots and one fungus,a species of Pythium,predominated.The morphologic...

Black rot of yam bean has been collected from the market in certain localities of Yunnan Province.The diseased tuber-root is characterized by the black dis- coloration of the interior tissues without conspicuous external symptoms.The evidence at hand indicates that the infection takes place before the digging time, through the dead main tap roots.It is unlikely that it works in the storage. Hundreds of isolations were made from the diseased tuber-roots and one fungus,a species of Pythium,predominated.The morphologic and cultural char- acters of this causal fungus closely resemble those of Pythium spinosum,described by Sawada in 1927. Inoculations of yam bean seeds were made by sowing them in soils mixed with pure cultures of the causal fungus.It did not cause preemergence of in- fection several weeks after inoculation.Elongate black lesions were found on the basal stems.The fungus caused neither damping-off nor wilt of young seed- lings. Healthy tuber-roots of yam bean were selected and cleaned.After inserting hyphae and spores beneath the epidermis,they were laid in a moist chamber. Black discoloration of the interior tissues developed in the course of about three weeks.The discolored area enlarged but very slowly.The results of these ino- culation experiments indicate that Pythium spinosum Saw.is very weakly parasitic to yam beans. Occasionally,as might be expected,certain other species of fungi were isolated from the diseased tuber-roots.Among them were found two other species of Pythium,identified respectively as P.irregulare Buisman and P.intermedium de Bary.However,inoculations of tuber-roots of yam bean with these fungi failed to produce the characteristic symptoms. Besides from yam beans,a species of Pythium was isolated from the roots of broad bean(Vicia fabae L.).Despite certain minor morphologic differences,it has been identified as P.spinosum Sawada.However,no cross inoculation ex- periments have been conducted.

(1)在云南昆明的市场上,发现有内部组织变黑、但外表没有显明症状的地瓜块根。这个病害,称为地瓜黑心病。(2)地瓜黑心病的病原菌是一种折倒病菌,定名为 Pytlium spinosum Sawada.(3)这个折倒病菌,侵害地瓜的致病力很弱。它不能使地瓜的种子在未出土前枯死,幼苗折倒和蔫萎。它不能使幼株死亡,仅使块茎的内部组织变色。(4)病菌似乎在大田内经主权或茎端侵入块根,发展很慢,迄今还只在收获的块茎内发现这个病害。

 
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