Na^＋，K^＋，Mg^＋∥NO3^-，Cl^-，SO4^2-H2O体系25℃热力学模型和溶解度预测Ⅲ：四元体系K^＋，Mg^2＋／NO3^-，SO4^2——H2O的Pitzer混合参数及其应用          下载免费PDF全文

张建黄雪莉  宋彭生 《盐湖研究》2008,16(1):17-21

前两文我们获得并讨论了用于六元体系溶解度计算合理的单独电解质Pitzer参数,及Na^＋,K^＋/Cl^-,NO3^-H2O四元体系混合参数和它们的应用。此次报道对K^＋,Mg^2＋//NO3^-,SO4^2-H2O四元体系混合参数的研究及其在体系溶液热力学性质和溶解度预测中的应用。  相似文献   

Na+,K+,Mg2+//NO3-,Cl-,SO42--H2O体系25 ℃热力学模型和溶解度预测Ⅲ:四元体系K+,Mg2+//NO3-,SO42--H2O的Pitzer混合参数及其应用   总被引：1，自引：1，他引：0       下载免费PDF全文

张建  黄雪莉  宋彭生 《盐湖研究》2008,16(1)

前两文我们获得并讨论了用于六元体系溶解度计算合理的单独电解质Pitzer参数,及Na+,K+∥Cl-,NO3--H2O四元体系混合参数和它们的应用。此次报道对K+,Mg2+∥NO3-,SO42--H2O四元体系混合参数的研究及其在体系溶液热力学性质和溶解度预测中的应用。  相似文献   

含硼水溶液热力学性质研究进展   总被引：1，自引：1，他引：0       下载免费PDF全文

张爱芸  姚燕 《盐湖研究》2008,16(2):54-60

我国青海盐湖卤水以富含硼、锂而闻名于世。含硼水溶液热力学性质及相平衡的研究具有重要的理论和现实意义。从含硼水溶液热化学、热力学性质及模型等方面综述了已完成的硼酸盐水溶液的研究工作,并指出了含硼溶液热力学研究存在的问题和发展的方向。  相似文献   

Adsorption Characteristics of β‐Ionone in Water on Granular Activated Carbon     

Jing Deng  Yi‐Sheng Shao  Nai‐Yun Gao  Shi‐Qing Zhou  Xu‐Hao Hu 《洁净——土壤、空气、水》2012,40(12):1341-1348

The adsorption performance of β‐ionone on four types of granular activated carbon (GAC) in water was investigated through batch experiments. The effect of initial β‐ionone concentrations and natural organic matter (NOM) adsorbed on GAC, adsorption kinetic and isothermal models were also studied. The results showed that four types of GAC all had good adsorption performance for β‐ionone, the equilibrium adsorption amount of the GAC employed was in the order of YK > GK > MZ‐A > MZ‐B. The adsorption amount increased with increasing initial concentrations. The presence of NOM could reduce adsorption of β‐ionone to a certain extent, and small molecular weight (MW) fractions (particularly <1000 Da) exhibited a remarkably competitive effect on the adsorption of β‐ionone. The experimental data showed good correlation with pseudo‐first‐order model. Furthermore, adsorption of β‐ionone on GAC fitted Freundlich, Langmuir, and Tempkin isotherms in the range of experimental concentrations, but followed Freundlich isothermal model most appropriate. The thermodynamic parameters were calculated by the results of the experiment, which showed adsorption of β‐ionone on GAC as being endothermic and spontaneous.  相似文献   

On constitutive modelling of unsaturated soils     

Antonio Gens  Marcelo Sánchez  Daichao Sheng 《Acta Geotechnica》2006,1(3):137-147

The paper presents a review of constitutive modelling of unsaturated soils. After a brief historical perspective, a number of existing constitutive models are classified and discussed according to the type of stress variables adopted in their formulation. Afterwards, attention is given to recent developments in the proposal of coupled hydraulic-mechanical models and the possibility of casting them in a sound thermodynamical framework. Finally, a double structure model for expansive soils is described. The incorporation of microstructural considerations and its use as a platform for incorporating the influence of new variables are highlighted.  相似文献   

Structure of fougerite and green rusts and a thermodynamic model for their stabilities     

Fabienne Trolard  Guilhem Bourri 《Journal of Geochemical Exploration》2006,88(1-3):249

Fougerite is a new iron oxide, a mixed M(II)–M(III) hydroxide, a member of the green rust group. Its structure consists of a brucitic layer of Fe(III)–Fe(II)–Mg(II), where the excess of the positive charge due to Fe³⁺ is compensated in the interlayer by anions. The limits of composition are structurally and geochemically constrained, and the stabilities of the mineral and green rusts are obtained by a thermodynamic model of a regular solid solution, for different compensating anions and for any allowed composition of the brucitic layer.  相似文献   

A creep–rupture model of synthetic fiber ropes for deepwater moorings based on thermodynamics     

《Applied Ocean Research》2015

The synthetic fiber ropes such as polyester, aramid and high modulus polyethylene (HMPE) are increasing applied to deepwater mooring systems for oil and gas exploitation. Due to that mooring ropes generally bear tensions for a long period, synthetic fiber ropes that are composed of the viscoelastic material would present creep behaviors and even the creep rupture, which is the failure mode of greatest concern especially for HMPE ropes and on which still less study can be found. A creep damage analysis of synthetic fiber ropes is of necessity to ensure the safe and economic operation of mooring systems. Therefore further investigation on the creep–rupture behavior is beneficial to fully establishing confidence in the viability of synthetic fiber ropes for deepwater moorings. In the present study, a creep–rupture model is proposed within the framework of thermodynamics to investigate the creep and damage behaviors of synthetic fiber ropes. Methods for identifying the model parameters are also proposed in detail, which apply to any component of fiber ropes such as the fiber, yarn, strand and rope. Experimental data of aramid yarns available from the literature are utilized to validate the constitutive model. Creep and creep–rupture tests of HMPE strands at different loading levels are specially performed to further examine the present model. The present work demonstrates that the proposed model can effectively describe the viscoelastic property and damage evolution of synthetic fiber ropes at different loading levels.  相似文献