检索结果-南通市图书馆

crystal Growth and crystallization Time Scales of the Panzhihua Layered Intrusion:Constraint from crystal size distribution

引用

Acta Geologica Sinica(English Edition) 2020年第5期94卷 1428-1439页

作者： LI Xuejun LUO Zhaohua LI Xiaowei WANG Yu YANG Zongfeng LI Jie LIU Xiao State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China

The Panzhihua layered intrusions is generated closely related to the Emeishan *** paper analyzes the spatial distribution of plagioclase and *** quantitative texture analysis of 2209 plagioclase shows that the characteristic length of plagioclase is 0.54 to 0.96 mm,the intercept variation range is large,from-0.67 to 0.96,and the slope is-1.85 to-1.04,the Aspect Ratio shows from 1.84 to 2.59 and fractal dimension D is 1.908–*** quantitative texture analysis of 2342 pyroxene shows that the characteristic length of pyroxene is 0.38–0.64 mm,the intercept shows from 0.46 to 2.26,The slope ranges from-2.6 to-1.47,the Aspect Ratio value varies from 1.53 to 1.71,the fractal dimension D is 0.93 to *** the CSDs results of the Panzhihua intrusions indicate that plagioclase and pyroxene form in an open magma system and undergo four replenishment of magma *** plagioclase crystals do not grow as the lathlike shape,and the fractal growth leads to complex crystal *** plagioclase undergoes deformation compaction during the crystal process,and then is *** pyroxene crystals grow along an approximately triaxial ratio and undergo texture adjustment and small crystal dissolution *** all crystals in magma system grows up to 2 mm,the pyroxene undergoes cumulation in the Panzhihua layered *** plagioclase crystallization time scale is 171.23–304.41 years,representing that the crystallization is the more uniform in central part of the *** nucleation density continuously increases during the crystallization process of the magma *** time scale to reach the final maximum crystal nucleation density is 15.28–58.98 years.

关键词： crystal size distribution crystallization time scales layered intrusions Emeishan large igneous province Panzhihua

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Control of crystal size distribution in Batch crystallization Processes Governed by Partial Differential Equations

Control of Crystal Size Distribution in Batch Crystallizatio...

引用

第三十届中国控制会议

作者： ZHANG Kun,XU Cheng-Zhong Universite de Lyon,Laboratoire d''Automatique et de Genie des Procedes,Universite Claude Bernard Lyon 1 43 Boulevard du 11 novembre 1918,F-69622,Villeurbanne Cedex-France

＜正＞The paper deals with the simulation of batch crystallization processes and their crystal size distribution controllability by temperature *** dynamic of crystallization processes under consideration is governed by hyperbolic partial differential *** propose simulating the processes of one size variable using the method of *** turns out that the method of characteristics has no numerical diffusion as compared to the finite difference *** a desired crystal size distribution,we investigate its reachability from the null initial condition（*** seeding） by controlling the temperature. Some checkable criterion is established to determine if a desired crystal size distribution is *** it is reachable, an admissible temperature control is constructed to steer the states to the desired distribution in finite *** construction is developed based on the discretized model and applied for the original model described by partial differential *** ensure a desirable distribution to be reached,we add an output feedback control law to correct possible errors given rise to by uncertainty of parameters.

关键词： Infinite-Dimensional System Controllability Method of Characteristics Balance Population Equation Batch crystallization crystal size distribution

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Estimation of crystal size distribution Based on Photomicrograph

Estimation of Crystal Size Distribution Based on Photomicrog...

引用

2009中国控制与决策会议

作者： Dongdong Wei,Yuhong Zhao Department of Control Science and Engineering,Zhejiang University,Hangzhou 310027,China

crystal size distribution is important for the production of pharmaceuticals and many other products in a number of industries.A new method to estimate the crystal size distribution is developed based on crystal photomicrographs acquired from an optical microscope imaging *** calibration of the imaging system is implemented by using a micrometer as a *** particle size information is extracted from each of a set of crystal images through image processing ***,according to the least square principle,different distribution functions are adopted to fit the particle size distribution respectively and the result with the minimum square error sum is chosen as the true size *** industrial application shows that the proposed method can provide a satisfactory estimation for the particle size distribution.

关键词： crystal size distribution Photomicrograph Calibration Image processing Curve fitting

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

U-net based Deep-Learning Image monitoring of crystal size distribution during L-Glutamic Acid crystallization

U-net based Deep-Learning Image monitoring of Crystal Size D...

引用

第40届中国控制会议

作者： Yan Huo Tao Liu Zhenyu Jiang Ji Fan College of Information Engineering Shenyang University Institute of Advanced Control Technology Dalian University of Technology

For monitoring the crystal size distribution（CSD） during L-glutamic acid（LGA） crystallization process,a deep-learning image analysis method is proposed based on the U-net *** proposed method consists of crystal image preprocessing,crystal image segmentation,and CSD *** cope with the negative influence on image analysis from continuous stirring of solution and particle motion in a crystallizer,the U-net network is adopted to perform deep learning for crystal image segmentation,with no need to prepare a large amount of training samples of real crystal ***,this approach could be implemented in real time for analysis of in-situ captured microscopic images,thus facilitating on-line measurement of ***,a log-normal distribution model is established for effectively depicting the one-dimensional（***） distribution of β-form LGA crystals during crystallization.A numerical example and experimental study on the cooling crystallization process of β-form LGA are shown to demonstrate the effectiveness the proposed method.

关键词： crystal image analysis deep learning size measurement crystal size distribution L-glutamic acid (LGA) crystallization process

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Double-Layer Model Building for Predicting crystal Product size distribution and Optimal Input Design

Double-Layer Model Building for Predicting Crystal Product S...

引用

第31届中国过程控制会议（CPCC2020）

作者： LIU Jingxiang LIU Tao CHEN Junghui School of Marine Electrical Engineering Dalian Maritime University Institute of Advanced Control Technology Dalian University of Technology Department of Chemical Engineering Chung-Yuan Christian University

To overcome the difficulty of modeling the complex crystal growth dynamics of cooling crystallization processes, a novel double-layer model building method is proposed to quantitatively describe the relationship between the crystal product size distribution and the key input variable of cooling rate, based on only batch run data to facilitate the optimal input design. The proposed model relating the input variable of cooling rate to the product crystal size distribution(CSD) is constructed by two layers of basis functions, i.e., the inner layer basis functions used for reshaping the product CSD and the outer layer basis functions for weighting the inner ones. For implemental simplicity, the widely used Legendre polynomials are taken as these basis functions by virtue of their orthogonality to each other. By introducing an objective function regarding the information entropy of product CSD, the optimal input design of cooling rate for obtaining desired product CSD can be carried out based on the above identified model. An illustrative example of the hen-egg-white lysozyme crystallization process is given to demonstrate the effectiveness and merit of the proposed method.

关键词： crystal size distribution design of experiment optimal input design double-layer approximation entropy

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A method for analyzing on-line video images of crystallization at high-solid concentrations

引用

Particuology 2008年第1期6卷 9-15页

作者： Jian Wan Cai Y. Ma Xue Z. Wang Institute of Particle Science and Engineering School of Process Environmental and Materials Engineering University of Leeds Leeds LS2 9JT UK

Recent research has demonstrated that on-line video imaging is a very promising technique for monitoring crystallization processes. The bottleneck in applying the technique for real-time closed-loop control is considered as image analysis that needs to be robust, fast and able to handle varied image qualities due to temporal variations of operating conditions such as mixing and solid concentrations. Image analysis at highsolid concentrations turns out to be extremely challenging because crystals tend to overlap or attach to each other and the boundaries between the crystals are usually ambiguous. This paper presents an image segmentation algorithm that can effectively deal with images taken at high-solid concentrations. The method segments crystals attached to each other along the mostly related concave points on the contours of crystal blocks. The detailed procedure is introduced with application to crystallization of L-glutamic acid in a hot-stage reactor.

关键词： crystallization High-solid concentrations Image processing Multi-scale segmentation Watershed segmentation crystal size distribution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Magmatic Processes of Ashi Volcano, Western Kunlun Mountains, China

引用

Acta Geologica Sinica(English Edition) 2014年第2期88卷 530-543页

作者： YU Hongmei XU Jiandong ZHAO Bo SHEN Huanhuan LIN Chuanyong Key Laboratory of Active Tectonics and Volcano Institute of GeologyChina Earthquake Administration

The Ashikule volcanic cluster （AVC） in western Kunlun Mountains is located in a graben region at the convergence of the Altun and Kangxiwa fault zones,and consists of more than 10 main volcanoes and dozens of *** Ashi volcano lies in the central part of the volcanic *** lithology,chemical composition and texture of Ashi volcanic rocks were studied in detail,and their implication in magmatic processes was *** phenocrysts in Ashi volcanic rocks consist mainly of plagioclase and pyroxene,and the statistical results of phenocryst contents show that the rocks can be subdivided into two *** group A,the content of pyroxene phenocrysts is generally higher than that of plagioclase phenocrysts,but an inverse relation occurs in group *** TAS diagram,the compositions of both groups fall into the trachyandensite field,but they are obviously concentrated into two *** two clusters exist also in the oxide *** pyroxene phenocrysts comprise augite,bronzite and hypersthene,and their Mg# histogram shows two *** phenocrysts with reaction rim are observed in rocks of both *** An values of the core are generally 30-40,and those of the rim are 44-48,which are closer to those of euhedral *** bronzites are in equilibrium with the melt,and two sets of magma depths,i.e.,18-25 km and 13-18 km,can be estimated by using thermobarometer proposed by *** hypersthenes are not in equilibrium with the melt,and can be assigned to *** crystal size distribution （CSD） curves of plagioclase appear as kinked lines indicative of magma *** above analyses show that two magma pockets might exist beneath the Ashi *** is likely that they are connected with each *** one has more evolved and contains more acidic magma,and the other is a trachyandensite magma pocket characterized by *** magma from the upper part of the trachyandensite magma pocket might mix with more acidic magma,r

关键词： texture chemical composition crystal size distribution Ashi volcano Ashikule volcanic cluster

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

crystallization Conditions and Mineral Chemistry in the East of Tafresh, Central Iran, with Insights into Magmatic Processes

引用

Acta Geologica Sinica(English Edition) 2019年第6期93卷 1755-1772页

作者： Davood RAEISI Hassan MRNEJAD Department of Geology Faculty of ScienceUniversity of TehranTehranIran Department of Geology and Environmental Earth Sciences Miami UniversityOxfordOhioUSA

The Tafresh granitoids are located at the central part of the Urumieh-Dokhtar Magmatic Arc(UDMA)in *** rocks,mainly consisting of diorite and granodiorite,were emplaced during the Early *** are composed of varying proportions of plagioclase+K-feldspar+hornblende±quartz±*** diagrams and chemical indices of amphibole phases reveal a calc-alkaline affinity and fall clearly in the crust-mantle mixed source *** estimated pressure,derived from Al in amphibole barometry,is approximately 3 *** granitoids are I-type,metaluminous and belong to the calc-alkaline *** are all enriched in light rare earth elements and large ion lithophile elements,depleted in high field strength elements and display geochemical features typical of subduction-related calc-alkaline arc *** crystal size distribution(CSD)line patterns from the granitoids show a non-straight trend which points to the effect of physical processes during *** presence of numerous mafic enclaves,sieve texture and oscillatory zoning along with the CSD results show that magma mixing in the magma chamber had an important role in the petrogenesis of Tafresh ***,the CSD analysis suggests that the plagioclase crystals were crystallized in a time span of less than 1000 years,which is indicative of shallow depth magma crystallization.

关键词： crust-mantle mixed source I-type subduction crystal size distribution magma mixing Urumieh-Dokhtar Magmatic Arc

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Recent Developments in the crystallization Process： Toward the Pharmaceutical Industry

引用

Engineering 2017年第3期3卷 343-353页

作者： Zhenguo Gao Sohrab Rohani Junbo Gong Jingkang Wang Department of Chemical and Biochemical Engineering The University of Western Ontario London ON N6A 5B9 Canada School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

crystallization is one of the oldest separation and purification unit operations, and has recently contributed to significant improvements in producing higher-value products with specific properties and in building efficient manufacturing processes. In this paper, we review recent developments in crystal engineering and crystallization process design and control in the pharmaceutical industry. We systematically summarize recent methods for understanding and developing new types of crystals such as co-crystals, polymorphs, and solvates, and include several milestones such as the launch of the first co-crystal drug, Entresto （No- vartis）, and the continuous manufacture of Orkambi （Vertex）. Conventional batch and continuous processes, which are becoming increasingly mature, are being coupled with various control strategies and the recently developed crystallizers are thus adapting to the needs of the pharmaceutical industry. The development of crystallization process design and control has led to the appearance of several new and innovative crystal- lizer geometries for continuous operation and improved performance. This paper also reviews major recent orogress in the area of process analytical technology.

关键词： crystallization crystal engineering Polymorphism crystallization process design and control crystal size distribution

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Pioneering Experimental Study on the Batch crystallization of the Citric Acid Monohydrate

引用

Journal of Chemistry and Chemical Engineering 2014年第6期8卷 611-620页

作者： Enzo Bonacci Department of Mathematics and Physics Scientific High School "G.B. Grassi" of Latina Latina 04100 Italy

Citric acid is an important organic substance whose marketing concerns various fields. Nevertheless, until 1997 the scientific literature reported little information about the process of crystallization by cooling through which the commercial product is obtained. In particular, the available studies were aimed to investigate only the kinetics of nucleation and crystal growth neglecting some effective aspects of the industrial crystallization in mechanically stirred apparatus. In order to fill that sci-tech gap, the Department of Chemical Engineering at the University ＂La Sapienza＂ of Rome decided to lead a long and meticulous experimental research on the crystallization in discontinuous （batch） of CAM （citric acid monohydrate） in the allotropic form that is stable at room temperature. Due to the number of people involved in that pioneering work, carried out in the historic laboratories of＂La Sapienza＂（Faculty of Engineering）, and motivated by the publication of related ***. dissertations and research papers, such collective effort was called ＂School of Industrial crystallization＂. Among the graduate students in Chemical Engineering that 17 years ago participated in that fruitful experience there was also the author who, under the supervision of Prof. Barbara Mazzarotta, had the specific task of assessing the effects on CAM of changing the crystallization operating conditions until their optimization; the achievements are briefly illustrated in this paper.

关键词： Batch crystallization CAM informative essay crystal size distribution Zwietering correlation.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：