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fourteen
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  十四
     The paper discusses fourteen using skills about Word2000/XP/2003.
     介绍了Word2000/XP/2003使用技巧十四则。
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     The mean recovery of fourteen substituted benzenes is 92%~98%,and the relation deviation is below 5%. The detection limited is 3.25×10 -9 g.
     本方法对十四种取代苯的加标回收率为 92 %~ 98% ,相对标准偏差在 5 %以下 ,最低检测限达 3.2 5× 10 -9g。
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     Troubleshooting Conclusion of the Chinese Electron Microscope Model DXB2-12 in the Past Fourteen Yeers
     国产DXB2—12透射电镜十四年故障维修
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     Infrared Image-Displaying of the Fourteen Meridian Courses
     人体体表十四经脉循行路线的红外热像显示
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     They were verified by fourteen laboratoriesThe results are equality between calculating ZMZ by using statistics method and testing ZMZ by using GB/T3142 method in 95% confidence level
     通过统计学方法,本文提出了可按PD值选用的三个ZMZ计算公式,并由十四个试验室对其进行了验证试验,结果表明,在置信水平为95%的条件下,采用GB/T3124法与采用本方法所得到的ZMZ值是一致的。
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  “fourteen”译为未确定词的双语例句
     Clinical Observation on Fourteen Cases with Joint Irradiation by Neutron and γ Sources.
     14例受中子源、γ源混合照射人员的临床观察
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     A STUDY OF MINIATURE TORCH IN ICP-AES-DETERMINATION OF FOURTEEN RARE EARTH ELEMENTS AND YTTRIUM IN GRANETES
     小型炬管ICP-AES研究Ⅱ—花岗岩中14种稀土元素和钇的测定
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     DETERMINATION OF FOURTEEN TRACE RE IN HIGHLY PURE EUROPIA BY CHEMICO-X-RAY FLUORESCENCE SPECTROMETRY
     高纯Eu_2O_3中稀土杂质的化学-X射线荧光光谱法测定
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     DETERMINATION OF FOURTEEN MAJOR AND TRACE ELEMENTS IN VARIOUS KINDS OF GEOLOGICAL SAMPLE USING THE FUSION TECHNIQUE BY X-RAY FLUORESCENCE SPECTROMETRY
     熔片法X射线荧光光谱测定多种类型地质样品中14个主次要元素
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     Studies on Fourteen HLA DR_4 Subtypes in a Chinese Papulation from Shanghai and Wuxi
     上海、无锡地区汉族人群HLA DR_4基因14种亚型分析
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  相似匹配句对
     Fourteen cases were misdiagnosed.
     误诊14例。
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     My Fourteen Rabbits
     我的十四只兔子
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  fourteen
Fourteen groups were interviewed with the Kettle's 16-factor questionnaire, and the results obtained were summarized.
      
Fourteen fluorochromes (free and oligonucleotide-bound) and five ligands commonly used to quantitatively assess DNA duplexes or complexes with proteins in microchips were studied by measuring their fluorescence excitation and emission spectra.
      
Fourteen peptides corresponding to sequences of all the exposed and some of the transmembrane protein regions of porin A from the outer membrane ofNeisseria meningitidis strain B:15:P1.7,16 were synthesized.
      
Fourteen fragments and structural analogues of chemokine MCP-1 were synthesized using the Fmoc-strategy of solid phase peptide synthesis.
      
Fourteen thermophilic and thermostable strains of the genus Bacillus were studied.
      
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1. All kinds of colonies of Volvox africanus were found in great abundance during the first two weeks of May, 1933, from a pond in Nanking.2. The smallest colony is much smaller than that recorded from Africa and the Philippine Islands.3. The somatic cells are not connected by protoplasmic filaments in adult colonies.4. Asexual colony usually contains from two to six daughters symmetrically arranged in pairs according to size on opposite sides of the polar axis.5. Sexual colonies of different kinds are developed...

1. All kinds of colonies of Volvox africanus were found in great abundance during the first two weeks of May, 1933, from a pond in Nanking.2. The smallest colony is much smaller than that recorded from Africa and the Philippine Islands.3. The somatic cells are not connected by protoplasmic filaments in adult colonies.4. Asexual colony usually contains from two to six daughters symmetrically arranged in pairs according to size on opposite sides of the polar axis.5. Sexual colonies of different kinds are developed from the asexual mother either singly or in combination with other kinds and asexual daughters.6. Parthenogonidia develope very early in young embryos long before the latter become matured and escaped from the mother colony. 7. During the early development of parthenogonidia, at least from first to fifth or sixth divisions, no growth of the whole embryo takes the place while the number of cells increases.8. Spermatogonia attain fully-grown size and begin to divide before the time of the birth of the colony.9. The development of spermatogonium consists of seven successive divisions in forming a bundle or platelet of one hundred and twenty eight spermatozoa or microgametes.10. The number of ovaries in a female colony varies from twelve to fourty six. Generally, the larger the colony, the more the ovaries developed.11. Risexual colonies contain only two or three spermatogonia in addition to fourteen to twenty seven ovaries.12. In general, specimens recorded in Nanking are identical to those from the tropical regions such as Africa and the Philippine Islands.

關於菲洲團走子之分佈,按記載所及。僅限於菲洲,菲列濱,南印度等熱带區域。今在南京發現,於地理分佈上實為一新記錄。此種團走子在羣體成熟之後,其體質细胞間,並無原生質線交相聯絡。無性羣體每含有二至六大小不同成對均置之無性幼羣體。幼羣體在脫離母體以前,往往含有第二代幼體。各種有性羣體,亦自無性母羣體中發達而成。雄性羣體,皆为橢圓形,而較其他羣體為小。雌性羣體中之卵或大配子约有十二至四十六。雙性羣體只含有二或三精原细胞,及十五至二十七卵或大配子。孤性生殖细胞在幼羣體内即發生。當最初五或六次分裂時,细胞雖增加,而幼胎並不長大。精原细胞经七次連續之均等分裂,而成一束一百二十八精子或小配子。

With the rapid progress of the electronic art, there has been a steadily increasing demand for still wider-bandwidth amplifiers. The recent introduction of distributed amplification concept has provided a new technique and powerful means for designing amplifiers with top cutoff frequencies far in excess of those previously obtainable with,ordinary amplifier circuits. A distributed amplifier of the low-pass type can easily be constructed to have a uniform frequency response from audio frequencies to frequencies...

With the rapid progress of the electronic art, there has been a steadily increasing demand for still wider-bandwidth amplifiers. The recent introduction of distributed amplification concept has provided a new technique and powerful means for designing amplifiers with top cutoff frequencies far in excess of those previously obtainable with,ordinary amplifier circuits. A distributed amplifier of the low-pass type can easily be constructed to have a uniform frequency response from audio frequencies to frequencies as high as several hundred me using conventional vacuum tubes. Unlike conventional circuits, distributed amplifiers have an attainable gain-bandwidth product which is not limited by shunt capacitance associated with the vacuum tubes and circuit wiring; the high-frequency limit being determined entirely by high-frequency effects within the tube proper.The purpose of this paper is to describe the basic principle of distributed amplification and to show how such an amplifier employing various types of transmission lines may be designed. Practical methods hi design and design details are given for a three-stage distributed amplifier, using fourteen 6AK5 pentodes with a frequency response of 0.1 mo to 140 mo and a gain of 33±1 db.Both the negative mutual-inductance m-derived and constant K artificial delay lines hare been used. The former offers the advantage of a more linear phase characteristic and a more uniform response both in amplitude and delay time.The experimental results corroborate the predictions based on the first-order theory described in this paper.

分布式放大是最近宽频带放大的最大成就,过去多年来电子学所应用的各种宽频带放大方法,其高频部分因受电子管电容和线路的分布电容所限制,不能获得理想的结果,而利用分布式放大的理论,所制成的宽频带放大器,远较一般普通的宽频带放大器,有更为宽阔的频带;从它的设计和构造上来看,也较负反馈的宽频带放大器为简单。制造一架自数千周至数百兆周的分布式放大器,在技术上并没有很大困难。本文拟对分布式放大的原理作扼要的分析;并提出了采用各类型仿真线所构成的分布式放大器的设计方法,并利用该设计方法,试作了一只三级十四管的分布式放大器,其增益为33±<1分贝,频宽自100千周至140兆周。由实验结果证明,采用m导出式低通滤波器所构成的仿真线的分布式放大器,实较用常K式者,具有更佳的相移特性和频率特性,这与理论上的分析是一致的。

The ethyl xanthate reaction for molybdenum is sensitive and is not interfered by tungsten, vanadium, chromium (Ⅲ) and uranium. Hence it is desirable to investigate it further as a method of determination. The results found are as follows:The acidity of the aqueous solution in which the molybdenum-xanthate complex forms should be adjusted to pH 1.11-1.56. And the complex is stable only for one minute in the media mentioned. The addition of acetone (2-25%) to the aqueous solution does not stabilize the complex...

The ethyl xanthate reaction for molybdenum is sensitive and is not interfered by tungsten, vanadium, chromium (Ⅲ) and uranium. Hence it is desirable to investigate it further as a method of determination. The results found are as follows:The acidity of the aqueous solution in which the molybdenum-xanthate complex forms should be adjusted to pH 1.11-1.56. And the complex is stable only for one minute in the media mentioned. The addition of acetone (2-25%) to the aqueous solution does not stabilize the complex to a notable degree.For extraction of the molybdenum-xanthate complex, ten organic solvents, namely petroleum ether, benzene, toluene, chloroform, carbon tetrachloride, chlorobenzene, diethyl ether, isoamyl alcohol, amyl acetate and isobutyl methyl ketone, are tested with respect to (a) the stability of the complex in these solvents (using optical density of the extracts as a measure) and (b) the effectiveness of various solvents in extraction. The complex is most stable in petroleum ether and toluene (at least for three days). The color of the complex in benzene is stable for fourteen minutes; in chloroform, ten minutes; in chlorobenzene, seven minutes and in carbon tetrachloride, six minutes. On the other hand, diethyl ether, isoamyl alcohol, amyl acetate and isobutyl methyl ketone are unsuitable for extracting the complex. Under similar conditions, various amounts of moly bdenum are extracted with different organic solvents, and the results obtained are plotted in Fig. 3. From the curves, it is found that among the organic solvents studied the following ranges of molybdenum content obey Beer's law: in chlorobenzene, 0-0.4 mg Mo; in benzene and in toluene, 0-0.3 mg Mo; and in chloroform and in carbon tetrachloride, 0-0.2 mg Mo. Petroleum ether can only be used with very low concentrations of molybdenum, and this is in accordance with Malowan's result.

本文證實溶液酸度对乙黃原酸钼錯合物的穩定度有影響。溶液的酸度最好調節在pH1.11—1.56之间。該钼錯合物生成后在水中僅穩定一分钟,故應在此期間以內用有機溶劑抽提。在丙酮-水溶液中,該钼錯合物亦不穩定。本文試驗了十種有機溶劑作抽提劑,比较了乙黄原酸钼錯合物在其中的穩定性和不同量钼的抽提效果。找出對該钼錯合物的穩定性而言,以石油醚和甲苯為最好。苯、三氯甲烷、四氯化碳和氯代苯次之(在一定的時間內可以使用),而乙醚、異戊醇、乙酸戊酯和異丁基乙酮,則均不適於作抽提之用。对抽提效果而言,氯代苯在钼含量0—0.4毫克範圍內遵循Beer定律;苯及甲苯次之;三氯甲烷或四氯化碳又次之;石油醚最差。根據上述,擬推荐甲苯作為最适宜之抽提劑。

 
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