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a characteristic     
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  的特征
     Study suggests that the combination of simple forms of topaz is {110}-{120}-{112}-{113}-{011}, in which {113} is a characteristic form of topaz in this deposit.
     结果表明,单形组合以{110}-{120}-{112}-{113}-{011}为主,其中{113}为本矿区黄玉的特征单形,且晶面发育相对较小。
短句来源
     LGMD2I presenting with a characteristic Duchenne or Becker muscular dystrophy phenotype
     LGMD2I是Duchenne型或Becker型肌营养不良的特征性表型
短句来源
     the Lower Triassic has a characteristic magnetic direction of Ds=150.8°, Is=48.1°, pole position: λ=63.7°N, φ=351.1°, Paleolatitude:29.1N°.
     下三叠统的特征磁化方向为 Ds=15 0 .8°,Is=- 4 8.1°; 极点位置为λ=6 3.7°N,φ=35 1.1°;
短句来源
     A Characteristic of Uniformly Smooth Banach Spaces
     一致平滑Banach空间的特征
短句来源
     coli K99, 987P and K88 with intact cells have a characteristic peak and a reproducible retention time (RSD≤0 9 %) respectively.
     coliK99、987P和K99的细胞分别具有单一、稳定 (RSD≤ 0 9% )的特征谱峰 ;
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  采用特征
     A Characteristic Parameter Methods in Crane Castings with CAD
     采用特征参数实现起重机用轮类件铸造工艺CAD
短句来源
     SDIC/CASDAIS developed a characteristic word dissect method to index keywo-rds which not included in dictionary,such as organism variety name, place name, chemical substance name, etc, and, depending on it,s free word judgement rules,free words in title can also be indexed.
     SDIC/CASDAIS系统采用特征词析取方法处理不包含在词表中的品种、物质名称和地名等关键词,其自由词判定规则还可以判别标题的部分自由词,通过词频统计可作为更新词表的依据。
短句来源
     This paper introduces an approach that uses the characteristic mains to de tect the faults on the s-a-1, s-a-0 and bridging faults existing in computer’s main memory, and discusses the existing-conditions of the characteristic mains. As an example,a characteristic matrix of the fault-detecting for the main memory ananged by bytes is given.
     介绍一种采用特征矩阵对计算机主存中存在的s—a—1,s—a—0,以及桥接故障的检测方法,讨论了该特征矩阵的存在条件,作为示例给出了对按字节组织的主存进行故障检测的特征矩阵。
短句来源
     A characteristic method is used to research into the hydraulic resonance system of a pipe-air chamber,indicating that with a proper structure parameter and fluid parameter,the system will improve the amplitude of the end-point pressure of the pipe.
     采用特征线法对用导管-气室水力共振系统提高脉冲水射流的强度进行了模拟研究,表明水力共振系统在合适的系统结构参数和流体参数情况下,可以提高导管出口处的压力振幅。
短句来源
  一个特点
     An association scheme with three associate classes from a given BIB design is derived by using the method of combination , and the association scheme does not degenerate to a two-associate-class association scheme, that is a characteristic of the association scheme.
     通过组合的方法,以一个已知的BIB设计导出了一个三个结合类的结合方案,而且这一结合方案并不能退化为两个结合类的结合方案,这是它的一个特点
短句来源
     The urban labor market of our country has three major characteristics mainly: First, the workforce's supply is greater than the demand, this will be a characteristic in long time of labor market of our country , second, the labor market of our country took shape spontaneously, various kinds of mechanisms are imperfect, cause of our country completion of labor market, third, of our country labor market operate external system environment determine of our country person who cut apart oflabor market.
     我国城镇劳动力市场主要存在三大特点:一是劳动力的供给大于需求,这将是我国劳动力市场长时间内的一个特点,二是我国劳动力市场是自发形成的,各种机制不健全,造成我国劳动力市场的不完善性,三是我国劳动力市场运行外部制度环境决定我国劳动力市场的分割性。
短句来源
     (2)In hypertensive patients with heart failure,the ratio of ADM/ADT decreased with the deterioration of heart failure Conclusion:The oversecretion of ADT and slow compensation of ADM is a characteristic deregulation of vasoactive peptide in the process of hypertensive heart failure.
     (2 )随着高血压心力衰竭中NYHA分级增高 ,ADM/ADT比值变低 ,ADT浓度明显增加 ,ADM代偿速度变慢。 结论 :ADM代偿缓慢和ADT分泌过度是高血压心力衰竭过程中血管活性肽调节紊乱的一个特点
短句来源
     It抯 a characteristic of this thesis to probe into development of theknowledge economy in China in view of sustainable development.
     从可持续发展这一角度出发来探讨中国发展知识经济问题是本文的一个特点
短句来源
     From the development of the story of" Wang Kui is faithless " , we can find out such a characteristic: the literatures of Song and Yuan dynasty were all faithless tragedies;
     从“王魁负心”故事的发展流变中,可以看出这样一个特点:宋元时期的这类作品,全都是负心鬼报的悲剧;
短句来源
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  有特征
     There is a characteristic peak in 580nm on the absorbance curve.
     所得的分散液中铜的平均粒径为43nm,吸收曲线在580nm处有特征峰。
短句来源
     Theorem 3 Let N be a normal subgroup of the solvable group G. If every character of Irr(G|N) has a distinct degree, then one of the followings occurs. (i) N has a characteristic series, N=N 0>N 1>…>N k-1 >N k=1 such that N i+1 is normal p complement of N i;
     定理 3 若N G ,Irr(G|N)中每特征标维数不同且G可解 ,则下列情形之一成立 :(i)N有特征子群序列N =N0 >N1>… >Nk-1>Nk =1使Ni+ 1为Ni 的正规pi 补 ;
短句来源
     The chlorhexidine content was measuredby ultraviolet spectrophotometry at the wavelengthof 258 nm where there is a characteristic absorptionpeak of chlorhexidine、As compared with perchloricacid titration measurement, the error in measuringthe diluted solution containing≤210 ug ofchlorhexidine was 0.9%~4.7%.
     在洗必泰有特征吸收峰的258nm波长下,以紫外分光光度法测定洗必泰含量.与高氯酸滴定法相比,对洗必泰量≤210μg的稀释液,测定误差为0.9%~4.7%.
短句来源
     This paper mention a method which utinize xenon ion laser to stimulate the malignant tumors of oral cavity to produce autofluorescence and finally record a photospectrum. The photospectrum of malignant tumors show a characteristic wave at 630 nm and/or 690 nm.
     本文提出应用Xe~+激光激发口腔恶性肿瘤产生自源荧光,记录成光谱,显示出恶性肿瘤于630nm和/或690nm处有特征峰。
短句来源
     1,2-Diamino-3,5-dibromobenzene is used for thecolorimetric determination of selenium in artificially cultured seleniumyeast. It reacts with selenium(IV)ion to produce dibromopiaselenole,which has a characteristic absorption peak at 365nm.
     1,2-二氨基-3,5-二溴代苯(DBDA)在酸性介质中与硒(IV)生成二溴代苤硒脑,在365nm有特征吸收峰,其A365nm值与硒(Ⅳ)浓度间存在良好的直线回归关系。
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  a characteristic
We use the theory of tilting modules for algebraic groups to propose a characteristic free approach to "Howe duality" in the exterior algebra.
      
The function, is a characteristic function of a probability distribution iff.
      
Three simultaneous blow-up rates are established under different dominations of nonlinearities, and simply represented in a characteristic algebraic system introduced for the problem.
      
In view of the definition of a characteristic function, the shape factor has a corresponding integral representation.
      
The Specific Density of a Leaf as a Characteristic of the Photosynthetic Apparatus
      
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1. The behavier of the autocatalytic electrode processes under constant current on planar and spherical electrode is discnssed. It is noted that there exists a characteristic maximum point on the potential-time curve. The inflnences of convection in solntion and curvature of electrode surface are also discussed.3. The current time curve of the autocatalytic electrode processes under constant potential on planar electrode is studied. There exists a characteristic minimum point on this curve.3. The...

1. The behavier of the autocatalytic electrode processes under constant current on planar and spherical electrode is discnssed. It is noted that there exists a characteristic maximum point on the potential-time curve. The inflnences of convection in solntion and curvature of electrode surface are also discussed.3. The current time curve of the autocatalytic electrode processes under constant potential on planar electrode is studied. There exists a characteristic minimum point on this curve.3. The method of determining the specific rate constant o?the autocatalytic reaction from the curves mentioned above is indicated.

1.讨论了在恒定电流电解下自催化的电经过程的情况,其特征是超电压对时间的曲线上出现极大点。 2.讨论了在恒定电位电解下自催化的电极过程的情况,其特征是电流对时间的曲线上出现极小点。 3.指出在上述两种情况下测定化学反应速度常数的方法。 4.讨论了对流及电极表面曲率的影响.

A new species sandflea collected from rodents of Yunnan is here described as, Tunga callida sp.nov. Both females and a male were found. This species differs from the previous Chinese sandflea,T. caecigena J. et R., in the following respects: 1. There are only 3-5 occipital bristles instead of 8-10 in T. caecigena. 2. The maxillary lacinia of the new species is 1.5 times the length of maxillary palp, whilethose of T. caecigena are about equal in length. 3. The manubrium of the male clasper is twice as long as...

A new species sandflea collected from rodents of Yunnan is here described as, Tunga callida sp.nov. Both females and a male were found. This species differs from the previous Chinese sandflea,T. caecigena J. et R., in the following respects: 1. There are only 3-5 occipital bristles instead of 8-10 in T. caecigena. 2. The maxillary lacinia of the new species is 1.5 times the length of maxillary palp, whilethose of T. caecigena are about equal in length. 3. The manubrium of the male clasper is twice as long as its movable finger and those of T.caecigena are equal in length. 4. Generally there is only 1 bristle on the metepimeron in females, but the other species hastwo. 5. The shape of the gravid females is spherical, it swells much more on the dorsal side thanon the ventral, and the segments posterior to the 5th are elevated to form a characteristic button-likeanal projection. In T.caecigena the shape is ellipitical with dorsal and ventral portions of body ofsimilar dilatation and the posterior segments of the abdomen form an anal cone of which the lengthand width of the projection are equal. 6. The females were localized at the rear end of the body of host, especially around the anus,while T. caecigena was found on the edge of ears. The main hosts of T. callida are Rattus norvegicus, R. flavipectus and R. sladent. But it may para-sitize Mus bactrianus, Apodemus agrarius che?rieri and Eothenomys sp. Rats may be infested with as manyas 45 females, but 81 out of 100 animals with on1y 1-10 fleas. These fleas were collected during themonths from November, 1951 through March, 1952 which might be at the peak of its seasonaloccurrence. Sandfleas sent from Wu Tung Chiao, Szechuan have been identified as Tunga caecigena. Thisis the first inland record of its occurrence.

1.本文描述了在云南弥渡、大理、昆明发现的新种潜蚤,订名为后潜蚤Tunga cal-lida sp.nov.并且还获有雄性标本1个。 2.本种和我国已有的盲潜蚤(T.caecigena)不同之处即在: (1)后头鬃只有3—5个,少于盲潜蚤的8—10个。 (2)下颚内叶长于下颚鬃,为其1.5倍,盲潜蚤的二者约同长。 (3)雄性柄状突为可动指长之倍。盲潜蚤的二者同长。 (4)雌性后胸后侧板鬃一般为1个,盲潜蚤者为2个。 (5)妊娠雌性外形为正圆形,背面突出较腹面为多,腹部第5节从后成钮扣状;盲潜蚤的外形为卵圆形,前端大,后端渐小,第5节以后呈长宽相等的锥形。 (6)寄生部位以宿主的身体后端为主,尤以肛门周围为最多;盲潜蚤则以耳翼边缘为主。 3.后潜蚤的主要宿主是沟鼠(Rattus norvegicus),黄胸鼠(R.flavipectus)和斯氏家鼠(R.sladeni),另外也寄生于长尾鼷鼠(Mus bactrianus),薛氏姬鼠(Apodemus agrariuschevrieri)和绒鼠(Eothenomys sp.)。 4.后潜蚤在每一宿主上可能多至45个,但以1—10个者为最常见(100例中有81例)...

1.本文描述了在云南弥渡、大理、昆明发现的新种潜蚤,订名为后潜蚤Tunga cal-lida sp.nov.并且还获有雄性标本1个。 2.本种和我国已有的盲潜蚤(T.caecigena)不同之处即在: (1)后头鬃只有3—5个,少于盲潜蚤的8—10个。 (2)下颚内叶长于下颚鬃,为其1.5倍,盲潜蚤的二者约同长。 (3)雄性柄状突为可动指长之倍。盲潜蚤的二者同长。 (4)雌性后胸后侧板鬃一般为1个,盲潜蚤者为2个。 (5)妊娠雌性外形为正圆形,背面突出较腹面为多,腹部第5节从后成钮扣状;盲潜蚤的外形为卵圆形,前端大,后端渐小,第5节以后呈长宽相等的锥形。 (6)寄生部位以宿主的身体后端为主,尤以肛门周围为最多;盲潜蚤则以耳翼边缘为主。 3.后潜蚤的主要宿主是沟鼠(Rattus norvegicus),黄胸鼠(R.flavipectus)和斯氏家鼠(R.sladeni),另外也寄生于长尾鼷鼠(Mus bactrianus),薛氏姬鼠(Apodemus agrariuschevrieri)和绒鼠(Eothenomys sp.)。 4.后潜蚤在每一宿主上可能多至45个,但以1—10个者为最常见(100例中有81例)。 5.我们采集的时间是1951年11月至1952年3月,因此可能它和盲潜蚤有相同的季节性。 6.四川五通桥市寄来潜蚤标本经鉴定为盲潜蚤,因此盲潜蚤的分布范围有进一步了解的必要。 7.1956年2—3月自贵阳的黄胸鼠和沟鼠体上获得后潜蚤,由于各仅

In this work the oxidation reactions of quinazolone-4 with chromic acid, potassium permanganate, peracetic acid, and perbenzoic acid have been studied. When quinazolone was heated with chromic anhydride in glacial acetic acid, quinazolone chromate(I) was isolated as previously reported in literature. Oxidation of quinazolone with potassium permanganate in neutral or alkaline solutions gave quinazolone oxalate (III) and with the same reagent in acidic solutions produced benzoylene urea (2,4-dihydroxyquinazoline,...

In this work the oxidation reactions of quinazolone-4 with chromic acid, potassium permanganate, peracetic acid, and perbenzoic acid have been studied. When quinazolone was heated with chromic anhydride in glacial acetic acid, quinazolone chromate(I) was isolated as previously reported in literature. Oxidation of quinazolone with potassium permanganate in neutral or alkaline solutions gave quinazolone oxalate (III) and with the same reagent in acidic solutions produced benzoylene urea (2,4-dihydroxyquinazoline, II). Carbon dioxide and ammonia were always liberated in these experiments, but no other oxidation product was isolated.In the oxidation with hydrogen peroxide in glacial acetic acid or in acetic anhydride, the following five compounds have been isolated and identified, namely, N~1, N~3-quinazolone dioxide (IV), 2,4,6-trihydroxyquinazoline (V), N-formyl-o-nitrobenzamide (VI), o-nitrobenzamide (VII) and benzoic acid (VIII). The relative amount of these products varied with the conditions of th oxidation reaction. Thus, when the reaction was carried out in glacial acetic acid at 55—60° for 14—28 hours, quinazolone was oxidized predominantly to compound VI (48—63% ), VII (11—17%) and VIII (3—9%). But when the oxidation was carried out at lower temperature (15—25°) either in glacial acetic acid or in acetic anhydride, the principal products were IV (up to 65%), V(up to 11%) and VI (up to 22%), and no significant amount of compounds VII and VIII could be obtained. From the reaction of quinazolone with perbenzoic acid in chloroform, the only product isolated was compound IV (51%).The oxidation products benzoylene urea (II) and benzoic acid (VIII) were identified by means of the mixed melting points. Quinazolone oxalate (III) was identified through its mixed melting point and the isolation of quinazolone and oxalic aicd upon treatment with sodium bicarbonate and followed by calcium chloride. The identity of o-nitrobenzamide (VII) was established through its mixed melting point and its hydrolysis o-nitrobenzoic acid.The structure of N-formyl-o-nitrobenzamide (VI) has been elucidated from its composition, its inability to react with potassium iodide, a characteristic reaction of N-oxide, and its easy hydrolysis in boiling water, cold dilute sodium bicarbonate solution and moist pyridine to o-nitrobenzamide and formic acid. The structure of quinazolone di-N-oxide(IV) has been determined on the basis of its elementary analysis, its conversion into quinazolone by potassium iodide in acetic acid at room temperature, its rearrangement to 2, 4,6-trihydroxyquinazoline in glacial acetic acid at 120° or with phosphorus trichloride in chloroform, and its further oxidation by hydrogen peroxide in glacial acetic acid to o-nitrobenzamide.The structural formula of 2,4,6-trihydroxyquinazoline (V) has been established by the following facts: First, its composition was found to be the same as the quinazolone di-N-oxide from which it was derived, but unlike the latter, it did not react with potassium iodide. Secondly,this compound gave a deep violet color with ferric chloride solution and formed with acetic anhydride a monoacetyl derivative which gave no color reaction with ferric chloride solution but could be hydrolyzed by diluted hydrochloric acid to the original trihydroxyquinazoline. Thirdly, the trihydroxyquinazoline reacted with phosphorus pentachloride in phosphorus oxychloride to give 2,4,6-trichloroquinazoline, and the latter was converted by hydrolysis with concentrated hydrochloric acid to 2,4-dmydroxy-6-chloroquinazoline. The identities of these monochloro-and trichloro-compounds have been established by mixed melting points with synthetic samples.Based upon the facts mentioned above, the mechanism of the oxidative degradation of quinazolone-4 with hydrogen peroxide in glacial acetic acid to form compounds IV—VII has been proposed as follows:The mechanism of the formation of benzoic acid (VIII) is still obscure.

喹唑酮在冰醋酸中与三氧化铬作用,形成喹唑酮铬酸盐(I);在中性或硷性溶液中与高锰酸钾作用,形成喹唑酮草酸盐(III),但在酸性溶液中与高锰酸钾作用,则形成2,4-二羟基喹唑啉(II)。以过氧化氢在冰醋酸或醋酸酐中与喹唑酮作用,分离出N~1,N~3-二氧化喹唑酮(IV),2,4,6-三羟基喹唑啉(V),N-甲酰隣硝基苯甲酰胺(VI),隣硝基苯甲酰胺 (VII)及苯甲酸(VIII)等化合物。这些氧化产物的相对产量,随反应条件不同而有很大的差别。在较强烈的条件下,主要产物为氧化程度较高的衍化物(VI—VIII);而在较温和的条件下,则主要产物为氧化程度较浅的化合物(IV—VI)。以过氧化苯甲酸在氯仿中与喹唑酮作用,则只分离出IV。 N~1,N~3-二氧化喹唑酮在醋酸中以碘化钾脱氧得到喹唑酮;在醋酸中重排为2,4,6-三羟基喹唑啉;在冰醋酸中与过氧化氢进一步反应,则得隣硝基苯甲酰胺。2,4,6-三羟基喹唑啉与醋酸酐作用,可得2,4二羟基-6-乙酰氧基喹唑啉,后者水解又得到三羟基喹唑啉。2,4,6-三羟基喹唑啉与五氯化磷在三氯氧磷中作用,即氯化为2,4,6-三氯喹唑啉,后者水解则得到2,4-二羟基6-氯喹唑啉。 N-甲...

喹唑酮在冰醋酸中与三氧化铬作用,形成喹唑酮铬酸盐(I);在中性或硷性溶液中与高锰酸钾作用,形成喹唑酮草酸盐(III),但在酸性溶液中与高锰酸钾作用,则形成2,4-二羟基喹唑啉(II)。以过氧化氢在冰醋酸或醋酸酐中与喹唑酮作用,分离出N~1,N~3-二氧化喹唑酮(IV),2,4,6-三羟基喹唑啉(V),N-甲酰隣硝基苯甲酰胺(VI),隣硝基苯甲酰胺 (VII)及苯甲酸(VIII)等化合物。这些氧化产物的相对产量,随反应条件不同而有很大的差别。在较强烈的条件下,主要产物为氧化程度较高的衍化物(VI—VIII);而在较温和的条件下,则主要产物为氧化程度较浅的化合物(IV—VI)。以过氧化苯甲酸在氯仿中与喹唑酮作用,则只分离出IV。 N~1,N~3-二氧化喹唑酮在醋酸中以碘化钾脱氧得到喹唑酮;在醋酸中重排为2,4,6-三羟基喹唑啉;在冰醋酸中与过氧化氢进一步反应,则得隣硝基苯甲酰胺。2,4,6-三羟基喹唑啉与醋酸酐作用,可得2,4二羟基-6-乙酰氧基喹唑啉,后者水解又得到三羟基喹唑啉。2,4,6-三羟基喹唑啉与五氯化磷在三氯氧磷中作用,即氯化为2,4,6-三氯喹唑啉,后者水解则得到2,4-二羟基6-氯喹唑啉。 N-甲酰隣硝基苯甲酰胺与沸水,冷碳酸氢钠水溶液或湿吡啶作用,则水解为隣硝基苯甲酰胺及甲酸。根据我们实验的结果,这些氧化产物的生成机构如下:■

 
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在学术趋势中查有关a characteristic的内容
 
 

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