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three-step     
相关语句
  三步
     A three-step enzyme method is proposed to prepers α-32P-dGTP with γ-32P-ATP as phosphatedonor, involving a series of enzymatic reactions.
     以γ-32P-ATP作磷酸供体,经三步连续的酶反应制备α-32P-dGTp。
短句来源
     The reaction process of formation of the Bi-Pb-Sr-Ca-Cu-O superconductor by means of a three-step reaction method was studied by high-temperature X-ray diffraction meansurement and DTA technique.
     采用高温X射线和DTA技术研究了三步反应法合成Bi-Pb-Sr-Ca-Cu-O超导体的反应过程。
短句来源
     The absorber layer CuIn_(0.7) Ga_(0.3) Se_2 films were deposited on a 10cm×10cm substrate using a three-step co- evaporation process.
     利用三步共蒸法工艺在10cm×10cm玻璃衬底上生长出电池吸收层CuIn_(0.7)Ga_(0.3)Se_2薄膜。
短句来源
     N-(2-Hydroxyethyl)-N-[3-(4-nitrophenyl)propyl]amine,the key intermediate for the synthesis of Nifekalant hydrochloride,was prepared from β-phenylpropanoic acid as atarting material through three-step reaction of nitration,N-acylation and reduction in overall yield of about 66.5 %.
     以β—苯基丙酸为起始原料,依次经硝化、N—酰化和还原反应合成了盐酸尼非卡兰药物中间体———N-(2-羟乙基)-N-[3—(4-硝基苯基)]丙基胺,三步总收率达66.5%。
短句来源
     2-Bromo-3-methyl-1,4-dimethoxynaphthalene(1),an important intermediate of menaquinone,was obtained via a three-step process employing(2)-methyl-1,4-naphtho-quinone(2) as starting material.
     以2-甲基萘醌(2)为原料,经过催化氢化、甲醚化和溴代三步反应,合成了维生素K2的重要中间体2-溴-3-甲基-1,4-二甲氧基萘(1)。
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  三步走
     'Three-Step' of Listening Comprehension in English Teaching
     大学英语听力教学“三步走
短句来源
     "Three-step"concept of Overhauling Marketization in Waterpower Enterprises
     对水电企业检修市场化的“三步走”构想
短句来源
     In order to realize Chinese socialist modernization and the three-step strategy aim,we must coordinate the environment and the economy.
     只有走生态与经济相协调的可持续发展道路 ,中国社会主义现代化建设才能取得顺利进展 ,现代化“三步走”的战略目标才能最终实现
短句来源
     " Two runs on foot" and"Three-run on Foot " has the same long-range goals, idea of phased development with the three-step development strategy, but different exploration and explanation.
     “两步走”与“三步走”发展战略有共同的远大的目标和阶段性发展的构想,却有着不同的探索、和解读。
短句来源
     “Three-Step” Strategy of Zhoushan Airport
     舟山机场的“三步走”战略
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  三步法
     Three-Step Method and Distinguishment of DS1820 Sequential Numbers
     一线式温度传感器(DS1820)序列号的三步法与识别
短句来源
     Different thawing methods in straw vitrification, including two-step, three-step and four-step dilutions, were compared and results showed that four-step dilution as well as three-step dilution achieved significant higher developmental rate than two-step dilution(P<0.05).
     在细管一步法冷冻保存的囊胚,用不同解冻程序对胚胎解冻后发育率进行研究,结果表明:蔗糖四步法解冻后的发育率与蔗糖三步法冷冻解冻后的发育率差异不显著(P>0.05),但两种方法均显著高于蔗糖两步法解冻后的发育率(P<0.05)、
短句来源
     Histological analysis of tumors were performed. Results:With three-step pre targeting tech nique,the tumor was clearly visualized at4h inγ-imaging and at this time point tumor /blood pool ra tio was5.76±1.64,while for control group were0.26±0.08and1.01±0.22,respectively.
     结果:三步法组在注药后4h肿瘤即显像,其瘤/血比值为5.76±1.64明显高于对照组(直接标记法组和153Sm-DB2组分别为0.26±0.08和1.01±0.22)。
短句来源
     Clinical study on three-step treatment of oral lichen planus by integrated traditional and western medicine
     中西医结合三步法治疗口腔扁平苔藓的临床研究
短句来源
     Hardware Design and Simulation for Efficient Three-Step Search Algorithm for Motion Estimation
     用于运动估计的高效三步法的硬件设计与仿真
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  三阶梯
     There was significant difference in frequency of use between traditional analgetic scheme and three-step scheme(P<0. 05).
     传统给药方案和“三阶梯给药方案”的镇痛疗效有显著性差异(P<0.05)。
短句来源
     CONCLUSION: The use of analgetics in cancer patients has not strictly adhered to the three-step analgetic scheme recommended by WHO.
     结论:我院癌症患者尚未严格按照WHO推荐的“三阶梯止痛方案”用药。
短句来源
     Three-step Ladder Approach to Analgesia for Pain in Patients with AdvancedCancer:A Clinical Analysis of 62 Cases
     三阶梯止痛法治疗晚期癌痛62例临床分析
短句来源
     Clinical analysis of three-step analgesic ladder for the treatment of 62 cases of advanced carcinoma of stomach
     晚期胃癌三阶梯止痛治疗62例临床分析
短句来源
     Since 1990, the cancer pain three-step analgesic ladder recommended by WHO was popularized in China, although some improvement in cancer pain treatment has occurred, yet there is no large proportion of cancer patients who have been benefited in cancer pain.
     我国自1990年推广实施WHO癌症疼痛三阶梯治疗方案,癌痛治疗状况虽发生一些改善,但是受益的癌症疼痛患者所占比例并不高。
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      three-step
    From the thermal reactor to the fast reactor and then to the fusion reactor; this is the three-step strategy that has been decided for a sustainable nuclear energy supply in China.
          
    We demonstrated that the much slower DsRed fluorescence development could be described by a three-step kinetic model, in contrast to the fast EGFP maturation, which was fitted by a one-step model.
          
    It was found that three-step fragmentation is a widespread phenomenon for molecules that experience resonant absorption of laser radiation.
          
    In the remaining cosmonauts, the exercise was three-step, with a total power of 1350 W.
          
    It is shown that the varieties of affine algebras, as well as the varieties defined by finitely generated three-step solvable Lie algebras, have exponential growth.
          
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    This is a preliminary report of the application of several methods in the making of bamboo pulp. The two-stage soda process and the two-stage sulfate process were first tested. It was found that the pulp obtained by the second process can be better bleached than that by the first process. In order to im-prove the quality of the pulp, the three-stage sulfate process was then applied. It consists of three steps, namely, cooking in water under slight pressure (115℃) for about one hour, digesting in a solution of...

    This is a preliminary report of the application of several methods in the making of bamboo pulp. The two-stage soda process and the two-stage sulfate process were first tested. It was found that the pulp obtained by the second process can be better bleached than that by the first process. In order to im-prove the quality of the pulp, the three-stage sulfate process was then applied. It consists of three steps, namely, cooking in water under slight pressure (115℃) for about one hour, digesting in a solution of one percent of the cook-ing reagent (HaOH:Na2S=2:l) at 120℃ for two hours, and finally digesting in a 5% solution of the reagent for three hours. This 3-stage method gave a product which is satisfactorily white and was found equally applicable to sev-eral kinds of bamboo used.

    本文系将数量制粕法应用於竹材纸粕之初步研究报告,试以二级碱法及二级硫酸盐法蒸解老竹,发现后者竟较前者更宜於竹材,所得硫酸盐竹粕,经漂白后色泽较碱粕为佳,再试以三级硫酸盐法,先以水於微压下(115℃)蒸煮一小时,次於120℃时以1%蒸解剂(NaOH:Na_2S=2:1)稀溶液预行蒸解两小时,最后以5%蒸解剂溶液蒸解三小时,结果可得洁白之纸粕,对於所用数量竹料均极相宜.第三级蒸解之最宜情况,经试验结果,以在160℃时用5%蒸解剂溶液(NaOH:Na_2S=2:1)蒸解3(1/2)小时之成绩为最佳,所得纸粕色泽既白,且漂剂消耗量亦低.作者曾将竹材皮层与心材剥离,分别以三级硫酸盐法蒸解,证明两者所得纸粕,就色泽及漂剂消耗量而言,大致相同,指示前人理论,谓老竹皮层中含有高分子胶质,纸粕不易漂白,似属不确.本试验仅用三种不同地区所产之竹为原料,故三级硫酸盐法是否适用於所有国产竹材,及其最宜蒸解情观是否完全相同,犹待於将来之研究.

    The work herein described resulted from the investigation on the Wohl-Zieglerreaction of para-methylanisole under different conditions.It was found that solventplayed an important role in the selective bromination.With carbon tetrachloride,side chain bromination was favored in 65% yield,while with glacial acetic acidring hromination was favored in 68% yield.During the reaction of N-bromosuc-cinimide(NBS)on anisole,liberation of bromine and then some hydrogen bromidegas were observed.These findings prompted a...

    The work herein described resulted from the investigation on the Wohl-Zieglerreaction of para-methylanisole under different conditions.It was found that solventplayed an important role in the selective bromination.With carbon tetrachloride,side chain bromination was favored in 65% yield,while with glacial acetic acidring hromination was favored in 68% yield.During the reaction of N-bromosuc-cinimide(NBS)on anisole,liberation of bromine and then some hydrogen bromidegas were observed.These findings prompted a further study of the reaction of NBSon several solvents such as carbon tetraehleride,chloroferm,benzene and benzoni-trile.Time of bromine liberation from these solvents has been determined andbenzoyl peroxide in every case served as a promoter.Therefore,the ring bromina-tion of these aryl ethers by means of NBS has been assumed to proceed via a rea-ction mechanism practically identical to the ring bromination by bromine.Fromthis assumption,we have tried to explain:(1)Why either aluminium chlorideor bonzoyl peroxide would serve as promoter in the ring bremination,(2)whym-methylanisole and resercinol dimethylether would be easily ring-brominatedoven in carbon tetrachloride,and(3)why m-methylanisole would not be bromi-hated easily on the side chain.Selective bremination of p-methoxy-acetophenonewas aide studied and 2,4-dimethoxy-5-bromobonzoic acid has been convienentlyand successfully synthesized from 2,4-dimethoxybenzene in three steps.Further studies on the Wohl-Ziegler reaction of p-methoxy-ethylbonzene and2,4-dimethoxyethylbenzene were made.The former would be easily brominated onthe side chain as predicted,while the latter even in carbon tetrachloride brominatedin the ring and would undergo side chain bromination only when an additionalmole of NBS was added.The results indicated that ring bromination was preferreddue to the highly activated benzene nuclei.And the orientation of ring bromina-tion which has been also determined was shown to be what one would expect fromelectrophilic mechanism of bromine ring-bromination.

    本文报告对-甲苯甲醚在不同情况下与 N-溴代丁二酰亚胺(NBS)的作用。作者认为溶剂是使溴化反应具选择性的一种重要因素。用四氯化碳则可以得到收率为65%的侧链溴化产物,如用冰醋酸则得到收率为68%的苯环溴化产物。我们在研究苯甲醚与 NBS 作用时,观察到有溴放出,而后又有溴化氢气体出现,由于这些现象,使我们进一步研究 NBS与数种溶剂,例如四氯化碳,氯仿,苯及苯腈的作用。同样发现都在不同的时间内能放出溴,并且过氧化苯甲酰对于在每一种上述溶剂中进行的反应都具催化作用,加速放出溴。我们认为芳香醚与 NBS 所进行的苯环溴化的反应机构基本上是与溴的苯环溴化的反应机构相同。据此我们可以解释,(1)何以三氯化铝与过氧化苯甲酰都能够作为苯环溴化的催化剂,(2)何以间-甲苯甲醚与间-二甲氧基苯即使在四氯化碳中也容易苯环溴化,以及(3)何以间-甲苯甲醚不易进行侧链溴化,此外也研究对-甲氧基苯乙酮的侧链溴化与苯环溴化。我们研究对甲氧基乙苯与2,4-二甲氧基乙苯的溴化反应,发现前者很容易进行侧链溴化,这是符合于游离基丙烯型溴化反应机构的,而后者即使在四氯化碳中首先是苯环溴化,如果再加一克分子 NBS,则第二个溴原子能进入侧链。这...

    本文报告对-甲苯甲醚在不同情况下与 N-溴代丁二酰亚胺(NBS)的作用。作者认为溶剂是使溴化反应具选择性的一种重要因素。用四氯化碳则可以得到收率为65%的侧链溴化产物,如用冰醋酸则得到收率为68%的苯环溴化产物。我们在研究苯甲醚与 NBS 作用时,观察到有溴放出,而后又有溴化氢气体出现,由于这些现象,使我们进一步研究 NBS与数种溶剂,例如四氯化碳,氯仿,苯及苯腈的作用。同样发现都在不同的时间内能放出溴,并且过氧化苯甲酰对于在每一种上述溶剂中进行的反应都具催化作用,加速放出溴。我们认为芳香醚与 NBS 所进行的苯环溴化的反应机构基本上是与溴的苯环溴化的反应机构相同。据此我们可以解释,(1)何以三氯化铝与过氧化苯甲酰都能够作为苯环溴化的催化剂,(2)何以间-甲苯甲醚与间-二甲氧基苯即使在四氯化碳中也容易苯环溴化,以及(3)何以间-甲苯甲醚不易进行侧链溴化,此外也研究对-甲氧基苯乙酮的侧链溴化与苯环溴化。我们研究对甲氧基乙苯与2,4-二甲氧基乙苯的溴化反应,发现前者很容易进行侧链溴化,这是符合于游离基丙烯型溴化反应机构的,而后者即使在四氯化碳中首先是苯环溴化,如果再加一克分子 NBS,则第二个溴原子能进入侧链。这结果说明在很活化的苯环上即使有侧链,首先、还是苯环溴化。我们也测定了溴进入苯环的位置,这些事实都符合于我们所设想的,芳香醚的 Wohl-Ziegler 苯环溴化基本上是溴进行苯环溴化的吸电子反应机构。2,4-二甲氧基-5-溴苯甲酸可以从2,4-二甲氧基苯乙酮经侧链氧化再进行苯环溴化合成,方法简便,收率良好。

    The epiphytotics of wheat stripe rust in spring followed three steps:(1) Spread from thefoci within a plantation,(2) spread between plantations in a region,(3) spread between re-gions.Accelerated rate in increase of distance of spread during the course of epiphytoties wasobserved.The distance of spread was found to be determined mainly by the quantity of inoculumand the rate of disease multiplication which was in turn dependent upon moisture and tem-perature.Based on the data obtained during 1960-1962,regression...

    The epiphytotics of wheat stripe rust in spring followed three steps:(1) Spread from thefoci within a plantation,(2) spread between plantations in a region,(3) spread between re-gions.Accelerated rate in increase of distance of spread during the course of epiphytoties wasobserved.The distance of spread was found to be determined mainly by the quantity of inoculumand the rate of disease multiplication which was in turn dependent upon moisture and tem-perature.Based on the data obtained during 1960-1962,regression equations of distance of spreadon quantity of inoculum under different conditions for disease multiplication were derived asfollows:Under average conditions:LogD=0.1794+0.5838 LogS,Under favorable conditions (with precipitation more than 20 m.m.in the period of infec-tion):LogD=0.40+0.55 LogS,Under unfavorable conditions (with precipitation less than 4 m.m.in the period of infec-tion):LofD=0.177+0.56 LogS:Where,D=distance of spread during an incubation period (m)S=quantity of inoculum,on basis of the number of rusted leaves × average degreeof severity.These equations are probably equally applicable to the spread either within a plantationor between plantations,but not applicable to the inter-regional spread.

    春季小麦条绣病在田块内、田块间及区域间的顺序传播距离按对数的加速度增加。根据调查资料,导出了不同侵染条件下的“菌量——传播距离”迥归公式为:一般侵染条件下:logD=0.1794+0.5838logS有利侵染条件(侵入前旬雨量>20毫米)下:logD=0.40+0.55logS不利侵染条件(侵入前干旱,旬雨量<3毫米)下:logD=-0.177+0.56logS其中:D=一次传播距离(公尺)。S=菌量,即病叶数×平均严重度。上面提出的初步公式只供计算在大面积地势平坦、一般风力、一般栽培条件下的感病品种麦田的田块内及田块间传播距离的参考。

     
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