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pure substances
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  纯物质
     The proportionality of ΔH~V/RT_c and ΔZ~V functions in vapor-liquid phase transitions for pure substances and its practical applications
     纯物质汽液相变中ΔH~V/RT_C和ΔZ~V的比例性及其实际应用
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     The free energy of Ca3As2 formation from the pure substances is estimated over the temperature range of 298-1873K.
     计算了298~1873K温度范围内由纯物质生成Ca_3As_2的反应自由能。
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     Test on volumes and on the deviation of fugacities of saturated liquid and vapour for 31 pure substances(up to n-eicosane) indicates that the representation of volumes and the calculation of fugacities of saturated liquid and vapour are improved, in comparison with results of Soave's, Peng-Robinson's, Schmidt-Wenzel's and Patel-Teja's equation of state.
     对31种纯物质的饱和气液相体积和气、液相逸度偏差的检验结果表明,改进后的状态方程不仅具有Soave和Peng-Robinson方程原有的优点,而且可以推广到象正二十烷这样的大分子物质:与同类型的Schmidt-Wenzel和Patel-Teja方程比较也具有相当或略好的体积计算精度,气、液相逸度的计算则有明显的改进。
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     Prediction of Heat of Vaporization for Pure Substances with Method of Residual Function
     剩余函数法预测纯物质汽化热
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     The compressibility factors of approximately equimolar, binary mixtures of CO 2 with He, Ar, SF 6 and CHF 3 were measured at 60℃ and at pressures of 2 ̄600 bar. The compressibility factors of the pure substances and of the mixtrues were used to calculate the mixing effect of the pressure and the excess volume.
     测定了60℃和2~600bar时由CO2和He、Ar、SF6以及CHF3组成的等分子二元混合物的压缩因子,根据纯物质和混合物的压缩因子计算了压力混合效应和过剩体积。
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  纯组分
     A MODEL FOR CALCULATING VISCOSITY OF HIGH PRESSURE FLUIDS WITH PURE SUBSTANCES/
     纯组分高压流体的粘度模型
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     The results show that the method can efficiently improve the prediction of the saturated liquid volume of pure substances in the near critical region when combined with PR equation of state, however it is uncertain to improve the prediction of the saturated liquid volume of mixtures.
     结果表明:该方法结合PR方程能有效地改进纯组分近临界液相体积的预测,但不一定能改进混合物液相体积预测;
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     The nucleus pool boiling of the two-mixture such as glycol-water, ethanol-water, propanol-ethanol was investigated experimentally. The experimental results show that the boiling heat transfer coefficients of these mixtures were lower than the pure substances.
     对乙二醇—水、乙醇—水、丙醇—乙醇几种二元混合物进行了池式沸腾传热实验 ,实验结果表明 :这些二元混合物池式沸腾传热膜系数较其纯组分的低 .
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  “pure substances”译为未确定词的双语例句
     The equation was tested for 350 pure substances of 13117 temperature points, the absolute average deviation was 2.8%.
     ,预测350种各类物质13117个温度点的汽化热,与文献常用值相比较的总绝对平均误差为2.8%。
短句来源
     The Kihara potential parameters of the pure substances were obtained by fitting P- V-T experimental data of these substances in vapor-liquid coexisting regions (0. 5< Tr < 1. 0) . The results of fitting were improved when the parameters were assumed to be linear functions of temperatures.
     纯物质的Kihara位能函数参数由拟合各物质在气液共存温度区(0.5
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     Results show that the accuracy of the new method is comparable to that of the method using pure substances as the solute.
     此方法简捷、可靠与常规以纯溶质进样的色谱测y~∞的方法具有相同的测定精度,可广泛用于缺少纯样的场合。
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     A new method for estimating enthalpy of vaporization of pure substances at different temperatures by CSGC
     基团对应状态法(CSGC)用于估算不同温度下纯物质的蒸发焓
短句来源
     Through elements analysis and determination of ash and combustion heat, molecular formulas and formation enthalpies of materials and products, which are all considered as pure substances, were figured out, and then metrology equation and total thermodynamic effect of the whole fermentation process were gained.
     通过元素分析、灰分测定和燃烧热测定,计算出假设为纯物质的发酵原料与产物的宏观分子式和生成焓,进而推导出发酵过程的计量学方程式和总的热效应。
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  pure substances
After validating the method with the 1-D interface tracking results for pure substances and alloys, it is then applied to two-dimensional (2-D) situations for binary alloys.
      
It has been established that, in contrast to the pure substances, the thermal decomposition of hexacyanotransition metal complexes, encapsulated in the large cavities of faujasite, occurs by a hydrolytic mechanism.
      
A definition in thermodynamics of the standard states of pure substances and solutions
      
Determination of the kinetic coefficients of crystallization of pure substances
      
Isomorphism of critical vaporization phenomena in pure substances and binary mixtures
      
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In the present investigation,a new route leading to the synthesis of 1-phenyi-1,3-propanediol(Ia)and 1-(substituted-plienyl)-1,3-propanediols throughWohl-Ziegler reaction has been described.Compound Ia was propared from 3,5-dinitrobenzoate of 3-phenylpropanel(Ⅱa)by converting first to 3-bromo-3-phenylpropanol,dinitrobenzoate(Ⅲa,m.p.122°)with bromosuccinimido,fol-lowell by treatment with silver acetate(or potassium acetate)and hydrolysis.Iaso prepared as well as its dinitro-bonzoato derivative was identical in...

In the present investigation,a new route leading to the synthesis of 1-phenyi-1,3-propanediol(Ia)and 1-(substituted-plienyl)-1,3-propanediols throughWohl-Ziegler reaction has been described.Compound Ia was propared from 3,5-dinitrobenzoate of 3-phenylpropanel(Ⅱa)by converting first to 3-bromo-3-phenylpropanol,dinitrobenzoate(Ⅲa,m.p.122°)with bromosuccinimido,fol-lowell by treatment with silver acetate(or potassium acetate)and hydrolysis.Iaso prepared as well as its dinitro-bonzoato derivative was identical in physicalconstants with that reperted in literature.By applying the same procedure,the following compounds were prepared:3-bromo-3-(o-phthalimido-p-nitrophenyl)-propanol acetute(Ⅲb,m.p.136°),3-bromo-3-(o-phthalimidemethyl-p-nitrophonyl)-propanol acetate(Ⅲc,m.p.120°),3-bromo-3-(o-cyano-p-nitrophenyl)-propanol.benzoate(Ⅲd,m.p.105°),1-(o-phthalmido-p-nitrophenyl)-1,3-propanediol acetate(Ⅳ,m.p.139°),1-(o-phthalimidomethyl-p-nitrophonyl)-1,3-propanodiol diacetate(Ⅳc,m.p.174°),1-(o-cyano-p-nitrophonyl)-1,3-propanodiol-1-acotate-3-benzoate(Ⅳd,mp.120°) and 1-(o-amino-p-nitrophenyl)-1,3-propanediol(Ib).The last compound has notbeen isolated as a pure substance,but isolated as its derivative,1-(o-dichloroacetyl-amino-p-nitrophenyl)-1,3-propanediol mono dichloroacetate(V,m.p.136°).Theyields,of the above compounds were usually satisfactory.3-(o-phthalimido-p-nitrophenyl)-propanol acetate(Ⅱb,m.p.124°)and 3-(o-phthalimidomethyl-p-nitrophenyl)-propanol acetate(Ⅱc,m.p.165°)wereprepared respectively from 3-(o-amino-p-nitrophenyl)-propanol(Ⅵa) and 3-(o-aminomethyl-p-nitrophenyl)-propanol(Ⅵb) by selective acetylation withacetyl chloride in acetic acid,saturated with hydrogen chloride,to form 3-(o-amino-p-nitrophenyl)-propanol acetate(Ⅶa,m.p.101°,its N-formyl Ⅷa,m.p.113°,and N-carbethoxy Ⅷb,m.p.106°)and 3-(o-aminomethyl-p-nitrophenyl)-prepanol acetate(Ⅶb,picrate,m.p.203°)The desired productswere obtained by fusing Ⅶa and Ⅶb with phthalic anhydride.When Ⅱb wassubjected to hydrolysis in a mixture of acetic acid and dilute hydrochloric acidⅦa was obtained,but in a mixture of ethyl alcohol and dilute hydrochloric acidit gave Ⅵa.Hydrolysis of Ⅲb in a mixture of acetic acid and hydrobromic acid,acompound,C_9H_6O_2N_2,was obtained.Both melting point and analytical data cor-respond to 7-nitroquinoline(Ⅸ)obtained by Bradford et al.The authors also reported another method to prepare substituted phenylpropanediol:when 3-o-nitrophenyl-3-hydroxy-propanal(Ⅹ)was reduced withlithium aluminium hydride,1-o-nitrophenyl-1,3-propanediol,isolated as itsdibenzoate (Ⅻ,m.p.132°),was obtained in low yields.

1,本文叙述从3-苯基丙醇的3′,5′-二硝基苯甲酸酯借 Wohl-Ziegler 溴化反应合成 1-苯基-1,3-丙二醇。2.用相同方法从3-(邻取代基-对硝基苯基)-丙醇酯合成1-(邻取代基-对硝基苯基)-1,3-丙二醇的相应的衍生物。此方法各步产量较高,可以用作在连于苯环的碳原子上引入一个羟基的制备方法。3.含氨基的化合物进行 Wohl-Ziegler 溴化反应时,最好用邻苯二甲酰基,保护氨基。4.3-溴代-3-(邻苯二甲酰亚氨-对硝基苯基)-丙醇乙酸酯在乙酸氢溴酸混合液中水解,获得7-硝基喹啉。

The Chinese folk medicine called Nan-Lin-Yao-Hua is a botanical drug (Wikstroemia viridiflora Meisen) family Thymelaeceae, which has been used as a remedy for ascites of the late stage Schistosomiasis. From its root bark or cortex radicis, a yellowish needle crystalline substance was isolated, and it is a new flavone glycoside and hence named wikstroemin. The new glycoside showed a diuretic action when intravenously injected at a dosage of 2—4mg/kg on anaesthetized dogs. This may respond a part of its...

The Chinese folk medicine called Nan-Lin-Yao-Hua is a botanical drug (Wikstroemia viridiflora Meisen) family Thymelaeceae, which has been used as a remedy for ascites of the late stage Schistosomiasis. From its root bark or cortex radicis, a yellowish needle crystalline substance was isolated, and it is a new flavone glycoside and hence named wikstroemin. The new glycoside showed a diuretic action when intravenously injected at a dosage of 2—4mg/kg on anaesthetized dogs. This may respond a part of its effectiveness. The wikstroemin (C_(28)H_(32)O_(15)) was obtained in light yellow needles and possesses a characteristic double melting point, melting at 200—202℃ into transparent yellow liquid and resolidified at 210℃ and finally decomposed at 270—272℃. The pure substance was obtained in 0.05%. It is insoluble in ordinary organic solvents, but sparingly soluble in hot water or warmed ethanol and methanol. It exhibits no color reaction with FeCl_3, but developes a deep red coloration with Mg-HCl. It gave a positive color test with Molisch's reagent and produced a golden yellow coloration in alkali solution. Its paper chromatography showed R_f=0.46 (BuOH:HOAc:H_2O=4:1:5). U. V. spectra in absolute ethanol shows peaks λ_(max) 262 and 333mμ (log ε=4.45 and 4.50). On acid hydrolysis, the wikstroemin gave an aglycone (C_(16)H_(12)O_5 m. p. 290—293°) and two moles of glucose. Although the wikseroemin gave a negative color reaction with FeCl_3, but its aglycone developed a violet brown coloration. This proves that the 5-position hydroxy group has been opened on hydrolysis. From the above properties, wikstroemin has been identified as a flavone glycoside and its aglycone as genkwanin by the comparison of U. V. spectra and mixed melting point with authentic sample. The digluconide has been proved to be linked on the 5-position in A ring as a known compound genkwanin-4'-methylether (C_(17)H_(14)O_5, m. p. 169—171℃) which was successively isolated on mild methylation and then hydrolysis. From this fact, there is ample reason to explain that the aglycone is not linked separately both in 5 and 4'-positions. Wikstroemin will not be hydrolysed by the emulsin which was freshly prepared from bitter almond. The structure formula, therefore, has been confirmed to be (Ib), as genkwanin-5-α-D-glucosido-α-D-glucose.

自瑞香科(Thymelaeceae)植物南岭荛花(Wikstroemia viridiflora Meisen,一种民間植物药,俗名海底龙)中分得一种新黄酮甙結晶,命名为南荛素(wikstroemin),分子式C_(28)F_(32)O_(15),具有双熔点200—202℃,270—272℃。由紫外吸收光譜及紙上层析知属于黄酮类。水解后得甙元,分子式C_(16)H_(12)O_5,熔点290—293℃,經乙酰化、甲基化产物的制备以及甙元及衍生物的各种物理化学性貭比較,証明甙元为芫花素(genkwanin)。所連接的糖为葡萄糖,經测定为2分子葡萄糖,并証实接在5位上,糖型为α型。因此南荛素的結构应为(Ib)所示。

In this paper, a modified cubic equation of state is proposed:Where m and n are the functions of acentric factor, a(T) is a dimensionless function of reduced temperature and critical compressibility factor. Examples of use of the equation for predicting the fugacity and volumetric behavior of pure substances are given. The proposed equation combines simplicity and accuracy. It performs as well as or better than EKS equation and PE equation in all cases tested and shows its greatest advantages in the fairly...

In this paper, a modified cubic equation of state is proposed:Where m and n are the functions of acentric factor, a(T) is a dimensionless function of reduced temperature and critical compressibility factor. Examples of use of the equation for predicting the fugacity and volumetric behavior of pure substances are given. The proposed equation combines simplicity and accuracy. It performs as well as or better than EKS equation and PE equation in all cases tested and shows its greatest advantages in the fairly good predicting of liquid phase densities.

本文提出了一个改进的 Van Der Waals (VDW) 型状态方程p=RT/(v-b)-aa(T)/(v+mb)(v-nb)其中m,n是偏心因子ω的函数,a(T)是温度和临界压缩因子的函数。检验结果表明:本方程一般都比 RKS 方程和 PR 方程精度要高,对某些物质则和这两个方程相当,对液相体积的计算精度提高尤为明显。最后,本文还提出了相应的混合规则。

 
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