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dissolution rates     
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  溶出度
     RESULTS:The dissolution rates of these 4 kinds of levofloxacin tablets all met the standards recorded in 2000 edition of China Pharmacopoeia,but significant differences were found in parameters of T50,Td,T80,and M(P<0.01).
     结果:4厂家左氧氟沙星片溶出度均符合2000年版《中国药典》规定,但其T50、Td、T80、m值间均有显著性差异(P<0.01)。
短句来源
     Result and Conclusion The dissolution rates of these 3 kinds of Pioglitazone Hydrochloride tablets meet the standards specified in 2005 edition of China Pharmacopoeia,and significant differences are not found in parameters of T_(50)、T_d and M(P>0.01).
     结果与结论3个厂家吡格列酮片溶出度均符合2005年版《中国药典》规定,其T50、Td、M值间无显著性差异(P>0.01)。
短句来源
     Dissolution rates were compared among ganciclovir dispersible tablet,Ganciclovir common tablet and Ganciclovir capsule.
     比较更昔洛韦分散片与普通片、胶囊的溶出度
短句来源
     No significant differences were noted in terms of the parameters of dissolution rates among the3batches of coated tablets(P>0.05).
     3批包衣片溶出度参数之间比较均无显著性差异(P>0.05)。
短句来源
     Methods: The dissolution rates were determined by colorime-try, using 0. 1 mol/L hydrochloride acid: cthanol (950: 50)as dissolution medium respectively.
     方法:以 0.1moL/L 盐酸—乙醇(950:50)为释放介质,用比色法对鞣酸小檗碱片的溶出度进行测定和比较。
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  溶出速率
     The studies on solubility showed that the equilibrium solubility in distilled water, 0.1M HC1 aqueous solution, pH7.4 phosphate buffer were 5. 956,11. 275and 6.681mg -ml-1, respectively; The intrinsic dissolution rates were 18.717, 41.332,33.2154 mg -cm-2 -min-1, respectively.
     测定得盐酸川芎嗪在水、0.1mol/L盐酸液、pH7.4磷酸缓冲液中的平衡溶解度(37℃)分别为5.956,11.275,6.681mg/ml,特性溶出速率分别为18.717,41.332,33.215mg/(min·cm~2)。
短句来源
     Dissolution studies were conducted under nonsink conditions and dissolution rates of six sieved particle size fractions (< 65, 65~74, 74~91, 91~125, 125~150, and 150~200 μm) were compared.
     在非漏槽条件下比较了六种筛分粒径(<65,65~74,74~91,91~125,125~150,和150~200mm)的溶出速率
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     It was found that RU_(486) was not water-soluble in pH>3.0 buffer and the dissolution rates of both commercial RU_(486) tablets and new formulation RU_(486) tablets in pH4.0 and pH5.0 buffer were much slower than those in pH<3.0 buffer.
     实验证明,RU_(436)在pH 3.0以上的水中难溶,在pH 1.2,pH 2.0,pH 3.0的条件下,自制片的溶出速率显著快于市售片。
短句来源
     Results Coprecipitates in different ratio can be prepared with solvent method. The dissolution rates of 1∶3,1∶6 and 1∶10 in coprecipitates of Rutin and PEG6000 were 826.1,2207.8 and 4385.7mg·100ml -1 .Conclusion The dissolution rate of Rutin can be increased significantly when coprecipitate of Rutin-PEG6000 was prepared.
     结果 :溶剂法可制得不同比例的芦丁 -PEG6 0 0 0固体分散体 ,1∶3、1∶6、1∶10共沉淀物样品的溶解度分别为 82 6 .1、2 2 0 7.8、4385 .7mg·10 0ml- 1 。 结论 :制成的芦丁 -PEG6 0 0 0固体分散体能极显著地提高原药的溶解度、溶出速率
短句来源
     D860 (tolbutamide)solid dispersions prepared with urea, polyvinylpyrrolidone (PVP), and polyethylene glycal (PEG) 6000 as carriers were studied byX- ray diffraction, relating to their dissolution rates.
     用X线衍射(XRD)对甲苯磺了脲(D860)与脲、聚乙烯吡咯烷酮(PVP)和聚乙烯二醇6000(PEG 6000)的固体分散物进行较详细的研究,并与它们的溶出速率进行关联。
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  溶解速率
     The dissolution rates of kaolinite in pH5.5, pH4.5 and pH3.5 HAC/NH4AC were 3.09×10-14 mol/(m2·s), 6.31×10-14 mol/(m2·s), and 1.13×10-13 mol/(m2·s), respectively.
     pH5.5、pH4.5和pH3.5的HAC/NH4AC缓冲液中高岭石溶解速率分别为:3.09×10-14mol/(m2·s)、6.31×10-14mol/(m2·s)和1.13×10-13mol/(m2·s)。
短句来源
     For example, under conditions of CO_2 partial pressures (p_ CO_2)>100Pa, limestone dissolution rates increase remarkably, by a factor of about 10 after the addition of carbonic anhydrase (CA) into the solution, which catalyzes the conversion reaction of CO_2. For dolomite, the increase of dissolution rate after the addition of CA appears at p_ CO_2 <10000Pa.
     如对灰岩而言,在实验中加入能催化CO2转换反应的生物碳酸酐酶(CA)后,其溶解速率增加出现在CO2分压>100Pa的区域,最高可达10倍;
短句来源
     In most laboratory experiments,there is an initial period during which nonlinear dissolution behavior is observed and steady-state dissolution rates range from 10-12 to 10-8 mol/(m2·s). Dissolution is nonstoichiometric in most experiments.
     实验室条件下,硅酸盐矿物存在非线性溶解现象,稳定态溶解速率一般为10-12~10-8 mol/(m2·s),而组分析出一般都是非理想配比的。
短句来源
     However, it was found from experiments and theoretical analysis that under similar conditions, not only are the initial dissolution rates of dolomite lower by a factor of 3 to 60 than those of limestone, but also there are different dissolution rate-determining mechanisms between limestone and dolomite.
     然而,实验和理论分析发现,在条件相似的情况下,白云岩的初始溶解速率不仅只有灰岩的1/3~1/60,而且灰岩和白云岩的溶解呈现出不同的速率控制机理.
短句来源
     The calcium dissolution rates of zoelite and wollastonite are relatively stable, and wollastonite show the feature of being high in the front and low in the rear in the low_pH area.
     沸石、硅灰石的钙溶解速率比较稳定 ,硅灰石在低 pH值区表现出前高后低的特点 ;
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  溶解速度
     At the first 30 min,the dissolution rates of U-10Zr al-loy pellets are 0.32g/cm ̄2·h and 0.05g/cm ̄2·h,respectively.
     初始0.5h时,铀溶解速度分别为0.32g/cm ̄2·h和0.05g/cm ̄2·h。
短句来源
     Based on the difference of dissolution rates of various gypsums, the choice of different types of gypsum for the production of different types of cement is proposed and discussed.
     本文根据不同种类石膏溶解速度不同的特点,提出不同品种水泥应采用不同种类石膏,并进行了分析和讨论。
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      dissolution rates
    In connection with this, we propose determining the contact-exchange and aluminum dissolution rates from a cathodic voltammogram of a nickel electrode in the working solution.
          
    These dissolution rates of copper substantially exceed the values evaluated from the analysis of the working solution.
          
    Any current measured in the external circuit corresponds to a difference in the dissolution rates of surface areas in contact rather than to the metal dissolution rate.
          
    A local corrosion of phase-heterogeneous carbon, as well as low-alloyed, steels at their active dissolution potentials is caused by the different dissolution rates of their phase components at the corresponding potential.
          
    Role of Hydrodynamic Conditions in the Distribution of Anodic Dissolution Rates in Cavity Etching Regions during Electrochemical
          
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    The anodic oxidation of antimony in sulphuric acid, in hydrochloric acid, and in potassium hydroxide solutions has been studied by measuring the polarization curves and by using the A. C. bridge to determine the electrode capacity and ohmic resistance for the investigation of the change of surface conditions in the course of oxidation. The empirical relations of polarization potential φ with current density i and pH at 25° are as follows:In 1—13.4 N potassium hydroxide solutions,φ=a + 0.116 log i — 0.115 pHin...

    The anodic oxidation of antimony in sulphuric acid, in hydrochloric acid, and in potassium hydroxide solutions has been studied by measuring the polarization curves and by using the A. C. bridge to determine the electrode capacity and ohmic resistance for the investigation of the change of surface conditions in the course of oxidation. The empirical relations of polarization potential φ with current density i and pH at 25° are as follows:In 1—13.4 N potassium hydroxide solutions,φ=a + 0.116 log i — 0.115 pHin 1—12.4 N sulphuric acid solutions,φ=a′+ 0.024 log i — 0.048 pHin 1—12 N hydrochloric acid solutions,φ=a″ + 0.024 logi + 0.051 pHThe rate of dissolution in KOH and in HCl at constant potential increased with the increase of OH- and Cl- concentration respectively; while in H_2SO_4, it decreased with increasing acid concentration. The pH dependence of the dissolution rate, λ=((?)log i/(?)PH)_φ, was estimated in each case.Theoretical data analysed in terms of electrochemical kinetics suggest the following mechanism for the anodic oxidation.In KOH, OH~- → OH_(ads.)+e~-, OH_(ads.)+OH~-→H_2O+O~-, Sb + O~-→SbO_(ads.) +e~-,2 SbO_(ads.) + O~-→Sb_2O_3 + e~-, Sb_2O_3 + O~- → Sb_2O_4 + e~-, 2 Sh_2O_4 → Sb_2O_3 + Sb_2O_5. The first step is regarded as rate-controlling.In H_2SO_4, H_2O~-→O~- + 2H~+ + e~-, Sb + O~- → SbO_(ads.) + e~-, SbO_(ads.) → SbO~+ + e~-,SbO~++ O~-→SbO_2~+ + e~-; and in HCl, the first and second steps are the same, then ShO_(ads.) + 2HCl → SbCl_2 + H_2O, SbCl_2 + Cl~- → SbCl_3 + e~-, and SbCl_3 + Cl~- → SbCl_4~-. The rate of the process is determined by the third step in each case.Accumulation of the oxidation products, Sb_2O_3, Sb_2O_5 and O_(ads.,) on the electrode surface to a thickness of 3—5 molecular layers leads to passivation in both acid and alkaline solutions. The evolution of oxygen is possibly the consequence of discharge of O- on the passive surface.

    本文用经典极化曲线的方法和交流电测定电极表面状态的方法,对锑在氢氧化钾、硫酸和盐酸中的阳极过程进行研究,获得如下的结果: 1.锑的阳极电位φ与极化电流密度i及pH之间的关系可由公式表示:φ=a+ blogi—b′pHo在1—13.4N氢氧化钾溶液中,b=116毫伏,b′=115毫伏;在1—14N硫酸中,b=24毫伏,b′=48毫伏;在1—12N盐酸中,b=24毫伏,b′=—48至—54毫伏。a为常数。 2.溶液pH对锑的阳极溶解速度的关系,λ=((?)logi/(?)pH)_φ,在氢氧化钾溶液中,λ=1;在硫酸中,λ=2;在盐酸中λ′=((?)logi/(?)pH)_φ=+2:即溶解速度在氢氧化钾或盐酸中随浓度增长而加速;在硫酸中则相反。 3.假设锑在这些介质中的阳极反应具共同的基本步骤:Sb+O~-→SbO_吸+e~-,在氢氧化钾溶液中,过程的进行依靠类似的步骤,使SbO继续氧化而逐步形成Sb_2O_3,Sb_2O_4;后者在溶液中因不稳定而歧化为Sb_O_3及Sb_2O_5。O~-假定通过如下步骤形成:OH~-→OH_吸+e~-,OH_吸+OH~-→O~-+H_2O。前者如为控制步骤则与实验数据相符合。在...

    本文用经典极化曲线的方法和交流电测定电极表面状态的方法,对锑在氢氧化钾、硫酸和盐酸中的阳极过程进行研究,获得如下的结果: 1.锑的阳极电位φ与极化电流密度i及pH之间的关系可由公式表示:φ=a+ blogi—b′pHo在1—13.4N氢氧化钾溶液中,b=116毫伏,b′=115毫伏;在1—14N硫酸中,b=24毫伏,b′=48毫伏;在1—12N盐酸中,b=24毫伏,b′=—48至—54毫伏。a为常数。 2.溶液pH对锑的阳极溶解速度的关系,λ=((?)logi/(?)pH)_φ,在氢氧化钾溶液中,λ=1;在硫酸中,λ=2;在盐酸中λ′=((?)logi/(?)pH)_φ=+2:即溶解速度在氢氧化钾或盐酸中随浓度增长而加速;在硫酸中则相反。 3.假设锑在这些介质中的阳极反应具共同的基本步骤:Sb+O~-→SbO_吸+e~-,在氢氧化钾溶液中,过程的进行依靠类似的步骤,使SbO继续氧化而逐步形成Sb_2O_3,Sb_2O_4;后者在溶液中因不稳定而歧化为Sb_O_3及Sb_2O_5。O~-假定通过如下步骤形成:OH~-→OH_吸+e~-,OH_吸+OH~-→O~-+H_2O。前者如为控制步骤则与实验数据相符合。在硫酸中则以共同步骤形成的中间物SbO失去电子而成SbO~+为控制步骤。在盐酸中因氧化膜SbO被氯离子破坏而生成络离子SbCl_4~-为控制步骤。在酸中,O~-假定是由水分子的单电子放电产生:H_2O→O~-+2H~++e~-。 4.由于氧化产物(Sb_2O_3,Sb_2O_5及吸附氧原子)在电极表面的积累,不论在酸或碱中,形成3—5个分子层,才导致表面钝化。氧的逸出发生在稳定钝化区的电位,这可能是O~-在钝化表面继续放电的结果。

    The in vitro dissolution rates from 5mg prednisolone tablets anddropped pills were determined using de-ionized water as the dissolutionmedium. A three crossover bioavailability study was performed in 8 humanadult volunteers comparing the fastest-and slowest-dissolving brand anddropped pills. The plasma samples were assayed for prednisolone by acompetitive protein binding method. The mathematical two-compartmentmodel(oral) by digital computer program and statistical analysis of thedata for two brand tablets...

    The in vitro dissolution rates from 5mg prednisolone tablets anddropped pills were determined using de-ionized water as the dissolutionmedium. A three crossover bioavailability study was performed in 8 humanadult volunteers comparing the fastest-and slowest-dissolving brand anddropped pills. The plasma samples were assayed for prednisolone by acompetitive protein binding method. The mathematical two-compartmentmodel(oral) by digital computer program and statistical analysis of thedata for two brand tablets showed significant differences between Cm.Tm.and Auc. of prednisolone samples. The dropped pills were essentiallyequivalent to the fastest tablet, but its potency was two times as highas the slowest one. The in vitro dissolution was correlated with thesein vivo results. The results of calculation on the two-compartment model show thatthe values of α and β are different from each other. A value becomes large,and the rate constant K_1, K_2, KE all positive It may be presumed thatprednisolone belongs to a two-compartment drug.

    本研究系从体外试验中选择了溶解速度最快和最慢的二个不同厂的片剂与滴丸进行体内有效性试验。采用竞争性蛋白结合法测定血中强的松龙浓度。经两室模型(口服)的数学处理和电子计算机运算结果表明在两种片剂之间有显著差异。滴丸与片剂(A)是等效的,但倍效于片剂(C)。体外一体内存在相关关系。α与β值相差较大,A值也大,速度常数K_1、K_2、K_E均为正值,可以认为强的松龙属两室模型药物。

    Samples of aspirin tablets from five manufacturers and one kind of aspirin powder were chosen in this experiment. Using the relationship between the dissolution rate in vitro and the blood drug level in vivo as indexes, we did the experiment for comparison of these four different methods (cup method, disintegration method, rotating basket method and column type method). The parameter T_(50) (medium time, 50%), Td (characteristic time, 63.2%), m (slope) and Tmax (peak time), Cmax (Peak concentration) and...

    Samples of aspirin tablets from five manufacturers and one kind of aspirin powder were chosen in this experiment. Using the relationship between the dissolution rate in vitro and the blood drug level in vivo as indexes, we did the experiment for comparison of these four different methods (cup method, disintegration method, rotating basket method and column type method). The parameter T_(50) (medium time, 50%), Td (characteristic time, 63.2%), m (slope) and Tmax (peak time), Cmax (Peak concentration) and Auc (area under the curve of blood level and time) were acquired.From the F values there appears to be singnificant differences in all parameters(P<0.01) and the sensitivity of column type method is better than the others, but the coefficient of variation of cup method is smaller There is a correlations of results between the parameter in vitro and the peak time in vivo of column type method.

    本实验收集了国内阿司匹林生产样品五种及原料一种,作为典型药品进行了四种方法(杯法,崩解仪法,转篮法及循环法)的体外测定并测定了体内狗血药水平,将体内外测定结果进行了统计分析。以T_(50)%(中位数时间),T_d(特征时间63.2%)及m(斜率)三个参数和体内的T_(max)(高峰时间),C_(max)(高峰浓度)及血药水平时间曲线下面积A_(uc)三个参数作F检验,认为在各方法之间有显著性差异,并且循环法的灵敏性较好,但变异系数以杯法最小,体内外有一定的相关。

     
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