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  “(铅”译为未确定词的双语例句
     The content of lead is 0.86 mg/kg,which is 4.3 times higher than the national security standard GB14935-94 of agricultural products (according to this standard,the content of lead≤0.2mg/kg),the content of other metals conforms to the national security standard of agricultural products.
     莲藕中铅含量为0.86 m g/kg(鲜重),超出国家安全食用农产品标准GB 14935-94(铅含量≤0.2 m g/kg)4.3倍,其它元素均符合标准.
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     The qualified rate of the chemistry pollution index ( lead , arsenic, copper, nitrite) was 100%.
     化学指标(铅、砷、铜、亚硝酸盐)合格率100%。
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     The heavy metal of the whole asymmetry membrane is obtained as high as 7.13 mg/g.
     对重金属离子(铅离子)吸附交换能力为7.13 mg/g。
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     Determination of Lead in Air and Waste Gas by Flame Absorption Spectrophotometry
     火焰原子吸收法测定空气与废气中的铅(铅尘和铅烟)
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     Biological evaluation was studied in a totalof 688 subjects including groups of exposcd,polluted and controlled under lead concentr-ation in air of 0.44~1.92, 0.013~0.24 and 0~0.0007mg/m~3 respectively.
     对几种铅中毒诊断指标进行了评价。 共计688人接触不同铅浓度(铅作业组接触铅浓度为0.44~1.92mg/m~3;污染组为0.013~0.24mg/m~3;对照组为0~0.0007mg/m~3)。
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     LEAD
    
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     THE LEAD AND ACETATE IONS COMPLEXES
     和醋酸根的络合物
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     Technical Lecture On Lead Acid Storage Battery(1)
     酸蓄电池(一)
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     Technical Lecture on Lead Acid Storage Battery ( Ⅱ )
     酸蓄电池(二)
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  (pb
The contents of the harmful chemical elements Cd and Pb were obviously reduced, while the crystal size increased from 24.5 to 35.7 nm and surface loosened.
      
Preparation and properties of luminous materials of CaSiO3: Pb, Mn by sol-gel method
      
The luminous materials of CaSiO3: Pb, Mn were synthesized by sol-gel method and ultrasound technology.
      
Quantum oscillations in Pb/Si (111) heterostructure system
      
This paper summarizes our recent work on the study of quantum size effects (QSE) and novel physical properties of the Pb/Si (111) heterostructure.
      
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With γ-rays of various wave-lengths the number of counts produced in a Geiger-Muller counter of Pb-wall was determined in equal time intervals. The same experiment was carried out with a counter of Al-wall. Let Npb and NA1 represent the number of counts produced in the Pb-counter and Al-counter respectively by a beam of γ-rays of even wave-length in a given time interval. The ratio Nph/NA1 observed decreases at first with the wavelength of the incident beam due to the diminishing photo-electric of lead. It is,...

With γ-rays of various wave-lengths the number of counts produced in a Geiger-Muller counter of Pb-wall was determined in equal time intervals. The same experiment was carried out with a counter of Al-wall. Let Npb and NA1 represent the number of counts produced in the Pb-counter and Al-counter respectively by a beam of γ-rays of even wave-length in a given time interval. The ratio Nph/NA1 observed decreases at first with the wavelength of the incident beam due to the diminishing photo-electric of lead. It is, however, found to increase by 16% when the wavelength of the incident radiation is decreased from a value 6.6 x. u. 4.7 x. u. This rising is due to particles produced by the interaction of hard γ-rays with the Pb-nuclei.

能力极大的丙种镭辐射,可以影响原子核,这是新近发见的事实。为进一步的研究,我们把极硬的丙种镭辐射,照在的数电子管(Electron Counter)上结果:除了射出的光电子和反跳子(Compton RecoilElectron)外,还观察到一种电子(有阴阳二种),约占总数的百分之十七。这种电子的来源,现在有两种解释:1从原子核里射出。(2)直接由丙种镭辐射变成。

This communication reports the results of a study of the gravimetric deter- mination of lead as normal phosphate, known as Vortmann and Bader method, which has been recently examined by Hubicki and Rys. According to our findings, tartaric acid should be added only when antimony is present. With the addition of tarearic acid unusual large excess of precipitant as suggested by Vortinann and Bader is required for complete precipitation. The suitable pH range for the precipitation of tertiary lead phosphate is 6.5...

This communication reports the results of a study of the gravimetric deter- mination of lead as normal phosphate, known as Vortmann and Bader method, which has been recently examined by Hubicki and Rys. According to our findings, tartaric acid should be added only when antimony is present. With the addition of tarearic acid unusual large excess of precipitant as suggested by Vortinann and Bader is required for complete precipitation. The suitable pH range for the precipitation of tertiary lead phosphate is 6.5 to 10. Below pH 6.5, the precipitation will be incomplete, owing apparently to the formation of acid phosphate(s). Beyond pH 10, no experiment has been made, because no advantage is gained by working in such alkaline media. The concentration of the precipitant in sdlution after reaction should be within 0.00085-0.0033 molar in order to obtain good results. The precipitates may be ignited at any temperature from 650℃ up to at least 900℃. The practice of drying the pre- cipitates at 130℃ to constant weight suggested by Hubicki and Rys should be discarded, since the precipitates still contain noticeable amounts of water after drying to constant weight at that temperature. It is preferred to use the method of precipitation from homogeneous solution. With this technique in practice dense, crystalline and easily filterable precipitates are obtained; and small quantity of lead, as low as 5 mg, may be determined satisfactorily. The effect of presence of some alkali and ammonium salts has also-been studied.

本文報告用磷酸根測定鉛重量法的各種適宜條件。溶液的pH值應在6.5至10之間。過剩沉澱劑在溶液中的濃度應為0.00085——0.0033M。沉澱應在650℃-900℃間灼燒之;如在130℃乾燥,則沉澱內的水份不能完全驅盡。均勻沉澱可改善沉澱的性質,並可测定少至5毫克的鉛。如溶液中無銻,則不必加酒石酸。

A method based upon simple diffraction theory is described for the calculation of modified paraboloid reflectors to produce from a point source a shaped beam of arbitrary shape in one plane and uniformly narrow in the perpendicular planes. A specific application of the shaped beam antennas is in connection with radar antennas designed for height finding. In this case the antenna must have a sharp elevation beam for obtaining precise elevation information and a rapid elevation scan. The beam must be relatively...

A method based upon simple diffraction theory is described for the calculation of modified paraboloid reflectors to produce from a point source a shaped beam of arbitrary shape in one plane and uniformly narrow in the perpendicular planes. A specific application of the shaped beam antennas is in connection with radar antennas designed for height finding. In this case the antenna must have a sharp elevation beam for obtaining precise elevation information and a rapid elevation scan. The beam must be relatively broad in azimuth in order that the target will be held in the beam long enough to obtain height information. If a fixed minimum of illumination is to be achieved at a given linear distance on both sides of the center line of the azimuth beam, the amplitude pattern must have the so-called "double cosecant" or "beavertail" shape.

本论文讨论如何利用简单衍射理论,计算改良抛物面反射器天线幅射之图型。此反射器可将一无方向性辐射源之能量聚集于任何形状之波束中。此原理可以应用在地面上或船面上寻求飞机高度雷达天线之设计。在此类雷达中,天线之方位图型必须为“双馀割平方”式;其特性为自波束对称轴线起,至其两端,辐射一次路程之功率,与方位角之馀割平方成正比。得此图型之最简易方法为置一狭窄之垂金属条于一截形抛物面反射器之中心,金属条之宽度,可改变波束之方向性;其支距,即金属条与反射器之距离,可影响两反射波之位相。故改变金属条之宽度及其支距,可得欲得之图型。 利用衍射及干涉理论,计算金属条及截形抛物面所生之总图型为:在方位面内,幅射强度J_H与水平角θ之关系为: J_H =AA[sin~2(15πsinθ)/(15πsinθ)~2-2(1-cosπ/4)sin(2πsinθ)/2πsinθ(sin(2πsinθ)/2πsinθ-sin(15πsinθ)/15πsinθ)]A为辐射波振幅,A为A之复共轭数。计算之结果与实验之结果,颇为一致。

 
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