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密度计

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By using a vitrating digital densimeter (DMA602/60), the densities of glycine and alanine in aqueous methanol, ethanol and propanol solutions were measured at 298.15 K, and the apparent molar volumes calculated. According to McMillan-Mayer approach, the volumetric interaction coefficients were evaluated.

用DMA602/60型震动管数字密度计测定了298.15 K下甘氨酸、丙氨酸分别在纯水和四个不同浓度甲醇、乙醇和丙醇水溶液中的密度,计算了相应的表观摩尔体积,用最小二乘法拟合了氨基酸在醇水溶液中的标准偏摩尔体积。

Objective elements: for example, the density of elements, 25%, 50% and 75% of the superimposition of plinthitic, as well as other can use densitometer or other color measurement equipment evaluation element.

不不主观元素:例如密度元素、25%、50%和75%的网纹、叠印色以及其他可以用密度计或其他色彩丈量摆设评估的元素。

The densitometer consists of a light source aimed at a photoelectric cell which determines the optical density of a sample.

密度计是一种量度底片黑暗程度的工具,由一个光源和光电电子元件组成,电子元件测量底片的光学密度。

There are two types :transmission densitometer for measuring film ,and reflection densitometer for measuring photographs as well as printed images.

密度计分两类:量度菲林的透射刻度和量度相片及印刷的反射密度计

The measurements were performed simultaneously by using a vibrating-wire instrument operating in the forced mode of oscillation.

采用振动弦黏度/密度计对碳酸二乙酯的黏度与密度进行了实验研究,测量的温度范围为263~363 K,压力范围为0.1~20 MPa。

Densities and viscosities of the binary mixture of ethyl crotonate with ethanol at different compositions were determined at the temperature range from 293.15K to 343.15K and under atmospheric pressure by using a vibrating U-shaped tube densimeter and Ubbelohde suspended-level viscometer.

在常压下采用U形振动管密度计测定了巴豆酸乙酯与乙醇的混合液在293.15~343.15K下的密度。

The air and the deionized water were considered as standard examples and the densities of diethylene glycol monobutyl ether were measured over a temperature rang of 20 ℃ to 60 ℃ with an Anton Paar DMA60 DMA602 vibrating tube densimeter.

以空气和去离子水为标准样,利用Anton Paar DMA60 DMA602振动管密度计测定了常压下二乙二醇丁醚在20—60℃间几乎每相间1℃密度数据。

Densities of glycine and L-serine in aqueous LiNO3, NaNO3 and KNO3 solutions have been measured at 298.15 K with an Anton Paar Model 55 densimeter. Apparent molar volumes, limiting partial molar volumes and transfer volumes have been calculated. Hydration numbers and volumetric interaction coefficients for amino acids were evaluated.

用Anton Paar DMA 55精密数字密度计测定了甘氨酸和L-丝氨酸在LiNO3, NaNO3和KNO3水溶液中的密度,计算了氨基酸的表观摩尔体积、极限偏摩尔体积、迁移偏摩尔体积、理论水化数和体积作用系数。

Densities of L-glycine, L-alanine and L-serine have been measured withan oscillating-tube densimeter(Anton Paar Model DMA 55)at 298.15 K inwater/DMFand water/ethanol mixtures ranging from pure water to 45% DMFby mass.

同时,本文利用DMA 55振荡管密度计测定了298.15K时甘氨酸、L-丙氨酸和L-丝氨酸在纯水及水/DMF、水/乙醇混合溶剂(浓度范围为5~45%,以10%递增)中的密度。

Densities of glycylglycine in sucrose-water mixed solvent have been measured at 288.15, 298.15 and 308.15 K by Anton Paar DMA55 vibrating-tube digital densimeter. The apparent molar volume VΦ, limiting partial molar volume , partial molar volumes of transfer Δtrs from water to sucrose-water mixed solvent and the hydration numbers Nh for glycylglycine have been calculated.

利用Anton Paar DMA55精密数字密度计测定了288.15, 298.15和308.15 K甘氨酰甘氨酸在蔗糖-水混合溶剂中的密度,计算了甘氨酰甘氨酸的表观摩尔体积VΦ和极限偏摩尔体积,得到了其由纯水溶剂转移至混合溶剂中的迁移偏摩尔体积Δtrs 和理论水化数Nh。

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