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Experimental study by online measurement of the precipitation of nickel hydroxide: Effects of operating conditions 被引量:2
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作者 Weiwei E Jingcai Cheng +1 位作者 Chao Yang Zaisha Mao 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第5期860-867,共8页
The objective of this work is using the online measurement method to study the process of precipitation of nickel hydroxide in a single-feed semi-batch stirred reactor with an internal diameter ofD = 240mm. The effect... The objective of this work is using the online measurement method to study the process of precipitation of nickel hydroxide in a single-feed semi-batch stirred reactor with an internal diameter ofD = 240mm. The effects of impeller speed, impeller type, impeller diameter and feed location on the mean particle size d43 and particle size distribution (PSD) were investigated, d43 and PSD were measured online using a Malvern Insitec Liquid Pro- cess Sizer every 20 s. It was found that d43 varied between 13 kwh and 26 lain under different operating conditions, and it decreased with increasing impeller diameter. When feeding at the off-bottom distance of D/2 under lower impeller speeds, d43 was significantly smaller than that at D/3. PSDs were slightly influenced by operating conditions. 展开更多
关键词 Nickel hydroxide Precipitation Particle size distribution Online measurement Stirred tank mixing
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Nonparametric Regression Estimation with Mixed Measurement Errors
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作者 Zanhua Yin Fang Liu Yuanfu Xie 《Applied Mathematics》 2016年第17期2269-2284,共17页
We consider the estimation of nonparametric regression models with predictors being measured with a mixture of Berkson and classical errors. In practice, the Berkson error arises when the variable X of interest is uno... We consider the estimation of nonparametric regression models with predictors being measured with a mixture of Berkson and classical errors. In practice, the Berkson error arises when the variable X of interest is unobservable and only a proxy of X can be measured while the inaccuracy related to the observation of the proxy causes an error of classical type. In this paper, we propose two nonparametric estimators of the regression function in the presence of either or both types of errors. We prove the asymptotic normality of our estimators and derive their rates of convergence. The finite-sample properties of the estimators are investigated through simulation studies. 展开更多
关键词 Berkson Error Classical Error DECONVOLUTION Kernel Method Mixed measurement Errors
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Mixing of particles and powders:Where next? 被引量:6
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作者 John Bridgwater 《Particuology》 SCIE EI CAS CSCD 2010年第6期563-567,共5页
Industrial mixers for powders and granular materials operate with no effective control of mixture quality and lack scientific design. The last twenty years have seen growth in understanding of mixing and mixers. Howev... Industrial mixers for powders and granular materials operate with no effective control of mixture quality and lack scientific design. The last twenty years have seen growth in understanding of mixing and mixers. However, research falls far short of what is needed for on-line characterisation of mixture quality. Secondly, although theoretical descriptions of a few mixer types have been reported, these fall far short of what is needed for equipment design. Two thrusts could revolutionise this situation. One is a scientific characterisation of mixer structure applicable to industrial scale as well as laboratory scale equipment; this is now within our grasp using digital imaging. The other is the development of ideas to overcome the restricted number of particles that can be used in the Distinct Element Method (DEM) for mixers. The goal should be to take the designer through a sequence of steps to the most appropriate mixer size, configuration and operating conditions for a given process duty. 展开更多
关键词 Design Granular materials mixing Mixers Powders Quality characterisation Quality measurement
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Poincar and Weak Poincar Inequalities for the Mixed Poisson Measure
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作者 Chang Song DENG 《Acta Mathematica Sinica,English Series》 SCIE CSCD 2014年第10期1719-1728,共10页
By using the Mecke identity, we study a class of birth-death type Dirichlet forms associated with the mixed Poisson measure. Both Poincare and weak Poincare inequalities are established, while another Poincare type in... By using the Mecke identity, we study a class of birth-death type Dirichlet forms associated with the mixed Poisson measure. Both Poincare and weak Poincare inequalities are established, while another Poincare type inequality is disproved under some reasonable assumptions. 展开更多
关键词 Mixed Poisson measure Poincare inequality configuration space birth-death process
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