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  detector
In this paper, high performance liquid chromatography (HPLC) along with mass spectrometry (MS) and HPLC along with a diode array detector (DAD) was used to study the compound Ilex pubescens extract.
      
The final residue was detected by HPLC, using a UV detector.
      
A better separation electropherogram was obtained when a 20 mM borate buffer at pH 8.5 and a fused silica capillary with an inner diameter of 100 μm with a total length of 47 (40 cm to the detector window) were used.
      
Energy Dispersive X-ray Detector quantitative analysis gave a 2: 3 stoichiometric ratio of Bi to Te, which was consistent with X-ray Diffraction results.
      
The MC1595 was utilized to compose a phase detector in which difference of phases varies with the change of frequencies.
      
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By surrounding a photo-neutron source of Ra+Ee with a thin spherical sbell of paraffin, a continuous spectrum of scattered neutrons, extending from zero energy to the energies of the primary neutrons is obtained. When a silver detector is exposed to such a spectrum, a part of the neutrons having just the energies at resonance with the silver nuclei is strongly absorbed by the detector and thereby produces the induced β-activity. By measuring the activity of silver and the apparent absorption coefficient...

By surrounding a photo-neutron source of Ra+Ee with a thin spherical sbell of paraffin, a continuous spectrum of scattered neutrons, extending from zero energy to the energies of the primary neutrons is obtained. When a silver detector is exposed to such a spectrum, a part of the neutrons having just the energies at resonance with the silver nuclei is strongly absorbed by the detector and thereby produces the induced β-activity. By measuring the activity of silver and the apparent absorption coefficient of the resonance neutrons in a thin silver absorber, the total width of the resonance levels effective to neutron capture and located in the above spectrum is estimated. Let τ He the average value of one half of the half-value width of the resonance levels, expressed in volts, and n be the number of resonance levels here concerned. We find nτ=260 volts for the silver nuclei of half period 22" if the energies of the primary neutrons are taken to be 2x 105 volts. Knowing nτ, we can evaluate the average spacing between adjacent resonance levels effective to neutron capture by giving a plausible value to τ. We find a spacing of the order 80-800 volts if τ be given the value 0.1-1.0 volt. This result is in good accord with the recent theoretical calculation of Bethe and also with observations of resonance groups in the low energy region.

把‘镭—铍’所产生的‘光中子’,穿过一层半厘米厚的白蜡,我们便得到一‘连续的中子谱’。他们中间有些中子,能和银的原子核起‘共振作用’,因此可以被银片吸收,而产生‘人工放射银’先测量人工放射的强度和‘共振中子’在银片中的吸收率,再应用原子核内共振能层的宽度,我们便可以求出银的原子核内‘共振能层’的密度大约共振能在零和二十万伏特中间,平均每隔一二百伏特便有一可以吸收质子的共振能层,和理论很相符合。

Some types of glass made thermal conductivity cells for gas analysis were prepared by author, which were constructed with tungsten wire 0.013m. m. in diameter, as a hot wire. Some of their properties had been tested with the gaseous mixtures of hydrogen-nitrogen and of air-carbon dioxide. The prepared thermal conductivity cells may be used with a higher sensitivity, and insensitive to the variation in the rate of gasflow; and with a rapid response to the variation in the composition of gaseous sample during...

Some types of glass made thermal conductivity cells for gas analysis were prepared by author, which were constructed with tungsten wire 0.013m. m. in diameter, as a hot wire. Some of their properties had been tested with the gaseous mixtures of hydrogen-nitrogen and of air-carbon dioxide. The prepared thermal conductivity cells may be used with a higher sensitivity, and insensitive to the variation in the rate of gasflow; and with a rapid response to the variation in the composition of gaseous sample during the continuous analysis. The apparatus can be used suitably as a detector in gas chromatography.

作者用直徑爲0.013mm鎢絲爲熱絲、試制了幾種玻璃制氧體分析用導熱池,並用■—■混合物和空氣—二氧化碳混合物試驗其性能。所製得的導熱池具有較高的靈敏度,對氣體流速改變不靈敏。在連續分析中,對氣體組成改變的反應較快,可適於在氣相色層中用作测定器。

In contrast to many other particles π- mesons at their stop-point effectively produce stars with large energy release. This phenomena has been used by us for selected detecting of π-mesons. The star-detector for π-mesons represents a simple telescope of two scintillation counters set in coincidence. The first counter is an ordinary counter with 100% efficiency for passing particles. The second counter of the star-detector works at a comparatively low voltage supply. Hence it detects the large light...

In contrast to many other particles π- mesons at their stop-point effectively produce stars with large energy release. This phenomena has been used by us for selected detecting of π-mesons. The star-detector for π-mesons represents a simple telescope of two scintillation counters set in coincidence. The first counter is an ordinary counter with 100% efficiency for passing particles. The second counter of the star-detector works at a comparatively low voltage supply. Hence it detects the large light impulses only, produced in the scintillator as the result of π - stars. Its efficiency for the detecting of passing particles is very low. The photomultiplier of the second counter works as a spectrometric one with highly stabilized voltage supply. Using this detector one may quickly (in 15 minutes, the π-beam intensity being 103 per sec) measure the range and energy of π- mesons.

负π介子和许多其他粒子不同,它们在介质中停止处有效地产生星裂,从而释放出大量的能量。我们利用了这种现象来选择性地探测负π介子。 星裂探测器是个计数管望远镜。它由二个符合闪烁计数管组成。其中第一管是普通的闪烁计数管,它记录透过粒子的效率是100%。第二管的工作电压放得较低,使之只记录负π介子在晶体中引起星裂而生的大的光脉冲;它记录透过粒子的效率极低。第二管用能谱分析性能好的光电倍加管,由高稳定的电源来供应。 用星裂探测器可以迅速测量负π介子的射程和能量。例如对强度为10~3/秒的负π介子束,测量能量只需15分钟。 这种探测器记录粒子时有选择性。它只记录星裂,而不记录其他停止的带电粒子(例如负μ介子),实验证明参看图7。我们所用的星裂探测器,对负π介子的灵敏度,比对负μ介子的灵敏度至少要大20倍。

 
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