作为有着重要历史渊源的国家,新加坡和中国在许多方面存在比较借鉴的基础。数学教材是数学教学系统中的重要组成部分。新加坡小学数学教材《我的朋友在这里!数学》MyPals are Here!Maths(第二版)与中国小学数学教材(人教版)有着各自不...作为有着重要历史渊源的国家,新加坡和中国在许多方面存在比较借鉴的基础。数学教材是数学教学系统中的重要组成部分。新加坡小学数学教材《我的朋友在这里!数学》MyPals are Here!Maths(第二版)与中国小学数学教材(人教版)有着各自不同的特点,新加坡小学数学教材中弥补"双基"的不足、问题解决与数学教学相融合、教材的编写以综合的数学活动为基础等做法对中国小学数学课程和教学研究有一定的启示和借鉴意义。展开更多
A computer model has been developed to simulate the nickel smelting process. The primary assumption of the model is that six phases in the nickel smelting furnace are in chemical equilibrium. The amounts of all compon...A computer model has been developed to simulate the nickel smelting process. The primary assumption of the model is that six phases in the nickel smelting furnace are in chemical equilibrium. The amounts of all components in matte, slag and gaseous phases under equilibrium are calculated by using the data of free energies of formation and activity coefficients of components. Two nickel sulfide species are used to allow for the modeling of sulfur-deficient mattes. The predictions by the present computer model are compared with the known data from Kalgoorlie nickel flash smelting. The agreements between the computer predictions and the known data are excellent,so that the present computer model can be used to monitor and optimize the actual industrial operations of nickel smelting process. The distribution behaviors of Ni, Co, Cu, Fe, S and O in the nickel smelting furnace are basically dependent on the process factors such as smelting temperature, volumes of air, and the element content.展开更多
L-phenylalanine, one of the nine essential amino acids for the human body, is extensively used as an ingredient in food, pharmaceutical and nutrition industries. A suitable equilibrium model is required for purificati...L-phenylalanine, one of the nine essential amino acids for the human body, is extensively used as an ingredient in food, pharmaceutical and nutrition industries. A suitable equilibrium model is required for purification of L-phenylalanine based on ion-exchange chromatography. In this work, the equilibrium uptake of L-phenylalanine on a strong acid-cation exchanger SH11 was investigated experimentally and theoretically. A modified Donnan ion-exchange （DIX） model, which takes the activiW into account, was established to predict the uptake of L-phenylalanine at various solution pH values. The model parameters including selectivity and mean activity coefficient in the resin phase are presented. The modified DIX model is in good agreement with the experimental data. The optimum operating pH value of 2.0, with the highest t-phenylalanine uptake on the resin, is predicted by the model. This basic information combined with the general mass transfer model will lay the foundation for the prediction of dynamic behavior of fixed bed separation process.展开更多
文摘作为有着重要历史渊源的国家,新加坡和中国在许多方面存在比较借鉴的基础。数学教材是数学教学系统中的重要组成部分。新加坡小学数学教材《我的朋友在这里!数学》MyPals are Here!Maths(第二版)与中国小学数学教材(人教版)有着各自不同的特点,新加坡小学数学教材中弥补"双基"的不足、问题解决与数学教学相融合、教材的编写以综合的数学活动为基础等做法对中国小学数学课程和教学研究有一定的启示和借鉴意义。
文摘A computer model has been developed to simulate the nickel smelting process. The primary assumption of the model is that six phases in the nickel smelting furnace are in chemical equilibrium. The amounts of all components in matte, slag and gaseous phases under equilibrium are calculated by using the data of free energies of formation and activity coefficients of components. Two nickel sulfide species are used to allow for the modeling of sulfur-deficient mattes. The predictions by the present computer model are compared with the known data from Kalgoorlie nickel flash smelting. The agreements between the computer predictions and the known data are excellent,so that the present computer model can be used to monitor and optimize the actual industrial operations of nickel smelting process. The distribution behaviors of Ni, Co, Cu, Fe, S and O in the nickel smelting furnace are basically dependent on the process factors such as smelting temperature, volumes of air, and the element content.
基金Supported by the Program for Changjiang Scholars and Innovative Research Team in University(No.IRT1066)National Natural Science Foundation of China(No.21306086)Applied Basic Research Programs of Science and Technology Commission Foundation of Jiangsu Province(No.BK20151452)
文摘L-phenylalanine, one of the nine essential amino acids for the human body, is extensively used as an ingredient in food, pharmaceutical and nutrition industries. A suitable equilibrium model is required for purification of L-phenylalanine based on ion-exchange chromatography. In this work, the equilibrium uptake of L-phenylalanine on a strong acid-cation exchanger SH11 was investigated experimentally and theoretically. A modified Donnan ion-exchange （DIX） model, which takes the activiW into account, was established to predict the uptake of L-phenylalanine at various solution pH values. The model parameters including selectivity and mean activity coefficient in the resin phase are presented. The modified DIX model is in good agreement with the experimental data. The optimum operating pH value of 2.0, with the highest t-phenylalanine uptake on the resin, is predicted by the model. This basic information combined with the general mass transfer model will lay the foundation for the prediction of dynamic behavior of fixed bed separation process.
