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Particle shape characterisation and classification using automated microscopy and shape descriptors in batch manufacture of particulate solids

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Particuology 2016年第1期14卷 61-68页

作者： Yang z.ang Jing J. liu Lei z.ang Jorge Calderon De Anda Xue z. Wang School of Chemistry and Chemical Engineering South China University of Technology 381 Wushan Road Guangzhou 510641 China School of Bioscience and Bioengineering South China University of Technology Guangzhou Higher Education Mega Centre Panyu District Guangzhou510006 China Institute of Particle Science and Engineering School of Chemical and Process Engineering University of Leeds Leeds I52 9JT UK

It is known that siz. alone, which is often defined as the volume-equivalent diameter, is not sufficient to characteriz. many particulate products. The shape of crystalline products can be as important as siz. in many applications, Traditionally, particulate shape is often defined by several simple descriptors such as the maximum length and the aspect ratio. Although these descriptors are intuitive, they result in a loss of information about the original shape. This paper presents a method to use principal component analysis to derive simple latent shape descriptors from microscope images of particulate products made in batch processes, and the use of these descriptors to identify batch-to-batch variations. Data from batch runs of both a laboratory crystalliser and an industrial crystallisation reactor are analysed using the described approach. Qualitative and quantitative comparisons with the use of traditional shape descriptors that have nhwical meanings and Fourier shape descriptors are also made.

关键词： Batch-to-batch variation Classification Principal components analysis Shape descriptors

Advances in the treatment of autism spectrum disorder:Wharton jelly mesenchymal stem cell transplantation

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World Journal of Methodology 2025年第1期15卷 72-79页

作者： Serdar Kabatas ErdinçCivelek Eyüp Can Savrunlu Umut Karaaslan Öz.em Yıldız.Erdal Karaöz Department of Neurosurgery University of Health Sciences TurkeyGaziosmanpaşa Training and Research HospitalIstanbul 34255Türkiye Department of Pediatric Allergy-Immunology Institute of Health Sciences Marmara UniversityIstanbul 34865Türkiye Center for Stem Cell&Gene Therapy Research and Practice University of Health Sciences TurkeyIstanbul 34255Türkiye Department of Child and Adolescent Psychiatry University of Health SciencesGaziosmanpaşa Training and Research HospitalIstanbul 34255Türkiye Department of Child and Adolescent Psychiatry Kocaeli University Faculty of MedicineKocaeli 41001Türkiye Center for Regenerative Medicine and Stem Cell Research&Manufacturing Liv HospitalIstanbul 34340Türkiye Department of Histology and Embryology Istinye UniversityFaculty of MedicineIstanbul 34010Türkiye Center for Stem Cell and Tissue Engineering Research and Practice Istinye UniversityIstanbul 34340Türkiye

BACKGROUND Autism spectrum disorder(ASD)is a complex neurodevelopmental disorder with multifaceted *** recent studies,neuroinflammation and immune dysregulation have come to the forefront in its *** are studies suggesting that stem cell therapy may be effective in the treatment of *** To evolve the landscape of ASD treatment,focusing on the potential benefits and safety of stem cell *** A detailed case report is presented,displaying the positive outcomes observed in a child who underwent intrathecal and intravenous Wharton’s jelly-derived mesenchymal stem cells(WJ-MSCs)transplantation combined with *** The study demonstrates a significant improvement in the child’s functional outcomes(Childhood Autism Rating Scale,Denver 2 Developmental Screening Test),especially in language and gross motor *** serious side effects were encountered during the 2-year *** The findings support the safety and effectiveness of WJ-MSC transplantation in managing ASD.

关键词： Autism spectrum disorder Neurorehabilitation Stem cell transplantation Wharton jelly mesenchymal stem cells Inflammation

Carbon nanotube and conducting polymer composites for supercapacitors

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Progress in Natural Science:Materials International 2008年第7期18卷 777-788页

作者： Daniel Jewell George z. Chen School of Chemical and Environmental and Mining Engineering University of Nottingham University ParkNottingham NG7 2RD UK

Composites of carbon nanotubes and conducting polymers can be prepared via chemical synthesis, electrochemical deposition on pre- formed carbon nanotube electrodes, or by electrochemical co-deposition. The composites combine the large pseudocapacitance of the conducting polymers with the fast charging/discharging double-layer capacitance and excellent mechanical properties of the carbon nanotubes. The electrochemically co-deposited composites are the most homogeneous and show an unusual interaction between the polymer and nanotubes, giving rise to a strengthened electron delocalisation and conjugation along the polymer chains. As a result they exhibit excellent electrochemical charge storage properties and fast charge/discharge switching, making them promising electrode mate- rials for high power supercapacitors.

关键词： Supercapacitor Carbon nanotube Conducting polymer

HOT DEFORMATION AND MARTENSITIC TRANSFORMATION BEHAVIORS OF Fe-32%Ni ALLOY

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Acta Metallurgica Sinica(English Letters) 2006年第2期19卷 133-138页

作者： J. Huang z. Xu Cold Rolling Mill Baoshan Iron ＆ Steel Co. Ltd Shanghai 201900 China Key Laboratory for High Temperature Materials and Tests of Ministry of Education Shanghai Jiaotong University Shanghai 200030 China

The Hot deformation and martensitic transformation behaviors of Fe-32%Ni alloy was investigated by measurements of electrical resistance and X-ray diffraction. With the increase in strain, the austenite goes through from the work-hardened to the partial dynamcally re-crystalliz.d and then to the completed dynamically re-crystalliz.d. The martensitic transformation characteristics depend on the austenite states. The work-hardening in small strain is helpful to martensitic transformation due to the low dislocation density and little lattice distortion, while the high dislocation density and severe lattice distortion by the increase in strain will hinder the martensitic nucleation. Once dynamic re-crystalliz.tion （ DRX ） takes place, the martensitic transformation will be enhanced again, which is related to the heterogeneous dynamic substructures. The growing DRX grain can enhance the martensitic nucleation due to the low dislocation density near its grain boundary.

关键词： Fe-32%Ni alloy hot deformation work hardening dynamic re-crystalliz.tion martensitic transformation

EFFECT OF AUSTEMPERING ON TRANSFORMATION INDUCED PLASTICITY OF HOT ROLLED MULTIPHASE STEELS

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Acta Metallurgica Sinica(English Letters) 2007年第1期20卷 1-8页

作者： z. Li D. Wu The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 China Shenyang Institute of Aeronautical Engineering Shenyang 110034 China

Effect of austempering on the transformation induced plasticity （TRIP） of hot rolled multiphase steel was investigated. Polygonal ferrite, granular bainite, and a large amount of stabiliz.d retained austenite could be obtained in the hot rolled multiphase steel. Strain induced martensite transformation （SIMT） of retained austenite and TRIP effectively occur under straining owing to austempering after hot rolling, and mechanical properties of the present steel remain at a relatively high constant value for austempering at 400℃. The mechanical properties of the steel exhibited a good combination of tensile strength （791MPa） and total elongation （36%） because the stability of retained austenite is optimal when the steel is held for 20min.

关键词： austempering hot rolled multiphase steel mechanical property strain-induced transformation transformation-induced plasticity (TRIP)

Simultaneous characteriz.tion of multiple properties of solid and liquid phases in crystalliz.tion processes using NIR

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Particuology 2011年第6期9卷 589-597页

作者： Chao 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

Near infrared spectroscopy （NIR） is now probably the most popular process analytical technology （PAT） for pharmaceutical and some other industries. However, unlike mid-IR, NIR is known to have difficulties in monitoring crystalliz.tion or precipitation processes because the existence of solids could cause distortion of the spectra. This phenomenon, seen as unfavorable previously, is however an indication that NIR spectra contain rich information about both solids and liquids, giving the possibility of using the same instrument for multiple property characteriz.tion. In this study, transflectance NIR calibration data was obtained using solutions and slurries of varied solution concentration, particle siz., solid concentration and temperature. The data was used to build calibration models for prediction of the multiple properties of both phases. Predictive models were developed for this challenging application using an approach that combines genetic algorithm （GA） and support vector machine （SVM）. GA is used for wavelength selection and SVM for mode building. The new GA-SVM approach is shown to outperform other methods including GA-PLS （partial least squares） and traditional SVM. NIR is thus successfully applied to monitoring seeded and unseeded cooling crystalliz.tion processes of L-glutamic acid.

关键词： Process analytical technology Near infrared spectroscopy Support vector machine Genetic algorithm Wavelength selection Cooling crystalliz.tion

Prediction of Boundary Layer Transition Based on Modeling of Laminar Fluctuations Using RANS Approach

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Chinese Journal of Aeronautics 2009年第2期22卷 113-120页

作者： Rez. Taghavi z. Mahmood Salary Amir Kolaei Department of Mechanical Engineering Iran University of Science and Technology Tehran 16846 Iran

This article presents a linear eddy-viscosity turbulence model for predicting bypass and natural transition in boundary layers by using Reynolds-averaged Navier-Stokes (RANS) equations. The model includes three transport equations, separately, to compute laminar kinetic energy, turbulent kinetic energy, and dissipation rate in a flow field. It needs neither correlations of intermittency factors nor knowledge of the transition onset. Two transition tests are carried out: flat plate boundary layer under z.ro ...

关键词： boundary layer transition eddy-viscosity turbulence model laminar fluctuations

MICROSTRUCTURE TRANSFORMATION IN THE WELDING HEAT AFFECTED z.NE OF 800MPa GRADE ULTRA FINE STRUCTURED STEEL

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Acta Metallurgica Sinica(English Letters) 2004年第3期17卷 238-246页

作者： J.B. liu L.J. Hu Y.T.Wang z. Q. liu K. Miao z.L. Tian Huaz.ong University of Science and Technology Wuhan 430074 China Technology Center of Wuhan Iron and Steel (Group) Corporation Wuhan 430080 China Central Iron and Steel Research Institute Beijing 100080 China

The transformation behavior and microstructure development in the heat affected z.ne(HAz.of 800MPa grade ultra fine structured steel was *** was found that the HAz.has intermediate temperature transformation characteristics in a wide range of cooling rates,with the bainite sheaves consisting of bainite ferrite plates without carbide precipitation and retained austenite in the fast cooling *** relatively high cooling rates,which corresponded to low heat inputs,the hardness of the simulated HAz.was above that of the base *** the cooling rate was below 9C/s,the welding HAz.would have an obvious *** analysis of transformation rates in continuous cooling processes was completed by numerical differential *** result indicated that the microstructure transformation rate of the HAz.in 800MPa grade ultra fine structured steel changed sharply to slow speeds when the cooling time t8/5 is longer than 7s.

关键词： ultra fine structured steel weld heat affected z.ne transformation rate microstructure

Upgrading of derived pyrolysis vapors for the production of biofuels from corncobs

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Frontiers of Chemical Science and Engineering 2018年第1期12卷 50-58页

作者： Liaoyuan Mao Yanxin Li z. Conrad z.ang State Key Laboratory of Catalysis Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

A bubbling fluidiz.d bed pyrolyz.r was integrated with an in-situ honeycomb as a catalytic upgrading z.ne for the conversion of biomass to liquid fuels. In the upgrading z.ne, z.olite coated ceramic honeycomb （z.CH） catalysts consisting of z.M-5 （Si/ Al = 25） were stacked and N2 or recycled non-condensable gas was used as a carrier gas. Ground corncob particles were fast pyrolyz.d in the bubbling bed using fine sand particles as a heat carrier and the resulting pyrolysis vapors were passed on-line over the catalytic upgrading z.ne. The influence of carrier gas, temperature, and weight hourly space velocity （WHSV） of catalyst on the oil product properties, distribution and mass balance were studied. Using z.CH effectively increased the hydrocarbon yield and the heating value of the dry oil, especially in the presence of the recycled noncondensable gas. Even a low usage of z.olite catalyst at WSHV of 180 h^-1 was effective in upgrading the pyrolysis oil and other light olefins. The highest hydrocarbon （≥C2） and liquid aromatics yields reached to 14.23 and 4.17 wt-%, respectively. The undesirable products including light oxygenates, furans dramatically decreased in the presence of the z.CH catalyst.

关键词： corncob monolith upgrading pyrolysis