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Dissertations / Theses on the topic 'Molecular weight distribution'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Adebekun, Aderinola Kolawole. "On-line control of molecular weight distribution." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/12039.

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2

Liu, Nannan 1973. "Molecular weight distribution of long chain branched polyethylene." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79248.

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To fully understand the properties of Long Chain Branched Metallocene Polyethylene (LCB mPE), we need to understand its molecular structure and Molecular Weight Distribution (MWD). Gel Permeation Chromatography (GPC) is the most important and widely applied technique to measure the MWD. In this analytical technique, polymer molecules are fractionated by their hydrodynamic volume (i.e. the sizes of polymer molecules in dilute solution). This work is focused on the simulation of GPC for the MWD of LCB mPE.<br>The polymerization reaction mechanism of LCB mPE provides a method to simulate t

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3

Wood-Adams, Paula. "Determination of molecular weight distribution from rheological measurements." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22683.

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An important characteristic of a polymer is its molecular weight distribution (MWD). The MWD affects both the processing and solid state performance properties of polymeric materials. Currently the analytical method for evaluating MWD involves the use of gel permeation chromatography (GPC). This is a labor and time intensive procedure, with the accuracy of the results depending strongly on the skill and experience of the equipment operator. Furthermore, GPC is not sensitive to small amounts of high molecular weight material that can have an important effect on processing and product properties

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4

Adebekun, Aderinola Kolawole. "On-line estimation and control of molecular weight distribution." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/11765.

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5

Kuo, Betsy P. "Narrowing the molecular weight distribution of linear alcohol ethoxylates." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/11773.

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6

Ghielmi, Alessandro. "Molecular weight distribution and gel formation in emulsion polymerization /." [S.l.] : [s.n.], 1999. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13436.

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7

Crewe, Robert John. "Modelling Plastics Pyrolysis by Thermogravimetry and Measurements of Molecular Weight Distribution." Thesis, University of Leeds, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485181.

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This thesis concerns the investigation of polymer pyrolysis by a combined approach of ' . , mathematical modelling and experimentation. This 'is done as a contribution towards better understanding how' materials behave in fire' situations. Thermogravimetric analysis has been investigated with regard to the accurate determination of kinetic parameters from thermogravimetric traces. This investigation has focused on various numerical methods that can determine the kinetic parameters from the curves and on correcting the buoyancy effect of the gas flowing through the analyser~ These mathematical

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8

Tanner, Beverly. "Optimal control of the molecular weight distribution in a continuous polymerization reactor." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/19430.

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9

Sánchez, Valencia Andrea. "Polystyrene blends : a rheological and solid-state study of the role of molecular weight distribution." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/51309/.

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Commercial polymers are typically classified according to their melt flow indices, measures of their viscosities. These properties are known to depend on a material’s molar mass distribution, on its averages and its degree of polydispersity. In determining a polymer’s performance, both the molar mass distribution and the process employed to produce the part are highly relevant, since the balance in the mass fractions from its distribution will determine the flow characteristics in the mould, and influence the material’s performance. The compromise polymer manufacturers have to make is to maint

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10

BREESE, DAVID RYAN. "MODELING THE EFFECTS OF SOLID STATE ORIENTATION ON BLOWN HIGH MOLECULAR WEIGHT HIGH DENSITY POLYETHYLENE FILMS: A COMPOSITE THEORY APPROACH." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1107958634.

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11

Schuck, Virna Josiane Aurelio. "Use of microdialysis as a tool to determine tissue distribution of lipophilic and high molecular weight compounds." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0008003.

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Thesis (Ph.D.)--University of Florida, 2004.<br>Typescript. Title from title page of source document. Document formatted into pages; contains 139 pages. Includes Vita. Includes bibliographical references.

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12

Terreau, Owen L. "The effect of block molecular weight distribution on morphologies of polystyrene-block-poly (acrylic acid) aggregates in solution /." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=85098.

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The effect of the molecular weight distribution of both the soluble and the insoluble blocks on the solution self-assembly of the amphiphilic block copolymer polystyrene-block-poly(acrylic acid) was studied. Copolymers of a variety of block lengths but with narrow molecular weight distributions were synthesized by sequential anionic synthesis. Mixing two or more copolymers of differing block length (while the second block length was identical) artificially increased the polydispersity index (PDI) of one block. Self-assembly was induced by adding water slowly to a copolymer solution unti

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13

Ritchie, Jason Duane. "The distribution of charge and acidic functional groups in natural organic matter the dependence on molecular weight and pH /." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-08252005-125918/.

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Thesis (Ph. D.)--Earth and Atmospheric Sciences, Georgia Institute of Technology, 2006.<br>Michael Bergin, Committee Member ; E. Michael Perdue, Committee Chair ; Ching-Hua Huang, Committee Member ; Ellery Ingall, Committee Member ; Martial Taillefert, Committee Member. Vita. Includes bibliographical references.

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14

Pollard, Carol J. "Distribution, Fluxes, and Bacterial Utilization of Different Molecular Weight Fractions of Dissolved Organic Matter in the York River Estuary." W&M ScholarWorks, 2002. https://scholarworks.wm.edu/etd/1539617786.

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15

Hadinata, Chitiur, and chitiurh@yahoo com au. "Flow-induced crystallization of polybutene-1 and effect of molecular parameters." RMIT University. Civil, Environmental and Chemical Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080212.163803.

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There are two main goals of this thesis: to investigate the flow-induced crystallization behaviour of Polybutene-1 (PB-1 samples, and to study the effects of molecular parameters on the crystallization behaviour While flow-induced crystallization is not a new area in polymer research, well-defined experimental methods that allow access to high flow rate range comparable to that encountered in real processing are still lacking. Two types of flow are considered: shear and uniaxial elongational. Regarding the second aim, several molecular parameters considered are: molecular weight, molecular wei

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Xu, Han. "Melt flow singularity in linear polyethylene : influence of molar mass, molar mass distribution and carbon-based fillers." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/7018.

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In the recent past it has been found that a considerable pressure drop occurred during the extrusion of linear polyethylene in the course of capillary flow. The pressure drop resides within a narrow temperature window of one to two degrees Celsius. In this research the hydrodynamic condition and molecular origin of the extrusion window of linear polymer were investigated further. The advantage of the extrusion window, viz. smooth extrudate with less die swell ratio attained at low extrusion pressure and temperature, has potential in industrial applications. However, the extrusion window, corre

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17

Farias, Thais Machado. "Determinação de espectros de relaxação e distribuição de massa molar de polímeros lineares por reometria." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/19005.

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A distribuição de massa molar (DMM) e seus parâmetros são de fundamental importância na caracterização dos polímeros. Por este motivo, o desenvolvimento de técnicas que permitam a determinação da DMM de forma mais rápida e a menor custo é de grande importância prática. Os principais objetivos deste trabalho foram a implementação de alguns dos modelos baseados da teoria da reptação dupla propostos na literatura para descrever o mecanismo de relaxação das cadeias poliméricas, a avaliação dessas implementações e a análise de dois passos fundamentais na obtenção da DMM a partir de dados reológicos

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Melissa, Agustin. "Thermal Stabilization of Nanocellulose by Chemical Modification." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225674.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第20449号<br>農博第2234号<br>新制||農||1050(附属図書館)<br>学位論文||H29||N5070(農学部図書室)<br>京都大学大学院農学研究科森林科学専攻<br>(主査)教授矢野浩之, 教授木村恒久, 教授髙野俊幸<br>学位規則第4条第1項該当

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19

Medeiros, Daniel Reis. "Tratamento de efluentes do branqueamento da polpa celulósica por processos oxidativos avançados baseados em ozônio." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-27022009-155513/.

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O impacto da oxidação com ozônio na transformação de compostos orgânicos de elevada massa molar (HMW) para o aumento da biodegradabilidade dos efluentes da indústria de celulose e papel foi investigado sob diferentes doses de ozônio. Os experimentos foram realizados utilizando-se os efluentes primário e de extração alcalina de duas indústrias de celulose sob dois valores iniciais de pH (12 e 7). Utilizou-se um reator em escala de laboratório equipado com um difusor de bolhas finas para a aplicação do ozônio. Os resultados revelaram o potencial da aplicação de ozônio como uma etapa de tratament

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20

Cao, Feishu. "Caractérisation de l'hydrophobie des polymères extracellulaires (PEC) extrait de biofilms : une étude basée sur la technique de la résine DAX-8." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1048/document.

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Les propriétés hydrophobes des polymères extracellulaires (PEC) exercent l’influence profonde sur les propriétés de la surface cellulaire. Cependant, de nombreux facteurs tels que les méthodes d'extractions, le type de substrat influencent les caractéristiques des PEC et les informations concernant des caractéristiques hydrophobes sont rarement documentées. L'objectif principal de cette étude est de développer une méthode appropriée pour étudier l'hydrophobicité des PEC, puis d'étudier les caractéristiques hydrophobes des PEC.Le fractionnement hydrphobe par la résine Supelite™ DAX-8 a d'abord

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21

Pereira, Rodrigo Vallejo. "Modelagem matemática de copolimerização em emulsão de acrilato de butila e estireno para determinação dos valores médios de peso molecular e distribuição de tamanho de partículas." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-20072016-144129/.

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Um modelo matemático da reação de copolimerização em emulsão de acrilato de butila e estireno em reator batelada e semi-batelada isotérmico foi desenvolvido e apresentou bons resultados quando comparado a experimentos disponíveis em literatura científica. O modelo contemplou a solução do balanço populacional, tanto para a distribuição de tamanho de partículas quando para a distribuição média de radicais por partícula. Contemplou-se também a solução do balanço de momentos, para obtenção da massa molar média numérica e mássica. O problema descrito foi resolvido através da solução numérica de um

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22

Jonnala, Ramakanth S. "Protein composition-functionality relationships using novel genetic lines." Diss., Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/578.

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23

Castellanos, Ortega José Ramón. "Contribution à la modélisation du procédé de copolymérisation en émulsion de l'alpha-méthylstyrène et du styrène." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL090N.

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Cette étude est consacrée à la modélisation de la copolymérisation en émulsion du styrène et de l'alpha-méthylstyrène. L'homopolymérisation de ce dernier, par voie radicalaire, est quasiment impossible à cause de sa faible réactivité, de sa température plafond faible et principalement des réactions de dépropagation dont il est le siège. Ce monomère est cependant susceptible de copolymériser avec d'autres monomères, par exemple le styrène, et dans ce cas la température de transition vitreuse du matériel obtenu est supérieure à celle du polystyrène seul. Dans le cadre de cette étude, la copolymé

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24

Melloni, Edoardo. "Cinética de polimerização avaliada por método rigoroso." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-28082015-104458/.

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A distribuição de pesos moleculares (DPM) de um polímero afeta as propriedades mecânicas, térmicas e reológicas do material. Além disso, a análise em tempo real de uma reação de polimerização é uma tarefa complicada e, consequentemente, os procedimentos de controle devem ser baseados em valores gerados pelos modelos. Por isso, é extremamente importante ter dados confiáveis sobre distribuições de pesos moleculares, melhorar a eficiência dos métodos existentes e desenvolver novos métodos capazes de prever as heterogeneidades das reações de polimerização. Experimentalmente, a DPM pode ser obtida

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25

Fischer, Martin. "Polymeranaloge Carbanilierung von Cellulose." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2004. http://nbn-resolving.de/urn:nbn:de:swb:14-1106412216968-39405.

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Characterization of cellulose by its molecular weight distribution is afforded after polymeranalogeous dissolution. Additionally, a molecular dispersion of the polymer is a prerequisite. Common processes are dissolution of cellulose in dimethylacetamide-lithiumchloride, nitration and carbanilation. Degradation of the polysaccharide chains can occur in each of the mentioned processes. It is shown that degradation in pyridine occurs via beta-elimination at carbonyl groups along the cellulose chains. Carbanilierung in DMSO is much more pronounced. It comprises oxidation along the Pfitzner-Moffatt

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26

Sjöberg, John. "Characterization of chemical pulp fiber surfaces with an emphasis on the hemicelluloses." Doctoral thesis, KTH, Fibre and Polymer Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3462.

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Saraf, Manish Kumar. "Polymerization of Vinylidene Fluoride in Supercritical Carbon Dioxide: Molecualr Weight Distribution." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20011119-185032.

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<p>SARAF, Manish Kumar. Polymerization of Vinylidene Fluoride in Supercritical Carbon Dioxide: Molecular Weight Distribution (Under the direction of Drs. George W. Roberts and Joseph M. DeSimone)Conventional vinylidene fluoride polymerizations require the use of large amounts of water. Therefore, energy and cost-intensive drying and separation steps are required to isolate the polymer. Additionally, some conventional polymerizations use fluorosurfactants that belong to 3M?s ?Scotchgard? family of surfactants, which are being phased out due to environmental concerns. In this research, we invest

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Dave, Kedar Himanshu. "Analysis of rheological properties and molecular weight distributions in continuous polymerization reactors." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/2127.

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Thesis (M.S.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Dept. of Chemical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Baqueiro, Avila Miguel. "Comparison of methods for estimating molecular weight distributions of linear polymers from rheological data." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79217.

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In recent years there have been many reports of methods for inferring the molecular weight distribution (MWD) of linear polymers from either viscosity data or dynamic data. This subject is of great interest in the polymer industry, since MWD affects the processing and final properties of polymers, and gel permeation chromatography (GPC), normally used for determining MWD, has several limitations. There are two main types of method for inferring the MWD from rheological data. The first one involves empirical transformations that lead directly to a MWD, whereas the second type involves th

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Siochi, Emilie J. "Dilute solution studies of molecular weight distributions of nitrocellulose, modified lignins and PMMA graft polymers." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54423.

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Dilute solution properties of three difficult-to-analyze macromolecular systems were investigated and clarified. Two were notorious for having highly time-in-solution dependent properties, nitrocellulose and lignin, while the third was an ideal model branched methacrylate polymer with which to examine unanswered questions in polymer hydrodynamic behavior. Gel permeation chromatography with a differential viscosity detector (GPC/DV) was employed to study the dilute solution properties of various polymers, specifically their absolute molecular weight distributions and hydrodynamic behavior. Th

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Alleman, Bruce C. 1957. "Molecular weight distributions of total organic halide in an aerated stabilization basin treating paper and pulp wastewater." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/191911.

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This report discusses the research and results of the study done to characterize total organic halide (TOX) distributions by apparent molecular weight (AMW) of combined effluents from a mill employing the Kraft pulp process. AMW distributions of TOX and total organic carbon (TOC) are examined at five locations within an aerated stabilization basin (ASB). An effort is made to explain experimental methods used for separation into AMW ranges and analysis for the described parameters. TOX and TOC results are tabulized and discussed. Degradation pathways of chlorinated organic compounds are examine

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32

Kim, Jung Dae. "Synthesis of polyolefins with controlled distributions of molecular weight and chemical composition by selective combination of supported metallocene/MAO catalysts." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0018/NQ38248.pdf.

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Goutte, Pascale. "Synthese et proprietes de polyoxirannes et polythiirannes porteurs de fonctions aldehyde potentielles." Paris 6, 1988. http://www.theses.fr/1988PA066266.

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Synthese et polymerisation de diethoxy-1,1 epoxy-2,3 et diethoxy-1,1 epithio-2,3 propane racemiques en vue de preparer des polyethers et polythioethers ayant des fonctions aldehydes dans la chocine laterale

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Täuber, Daniela. "Characterization of heterogeneous diffusion in confined soft matter." Doctoral thesis, Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-77658.

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A new method, probability distribution of diffusivities (time scaled square displacements between succeeding video frames), was developed to analyze single molecule tracking (SMT) experiments. This method was then applied to SMT experiments on ultrathin liquid tetrakis(2-ethylhexoxy)silane (TEHOS) films on Si wafer with 100 nm thermally grown oxide, and on thin semectic liquid crystal films. Spatial maps of diffusivities from SMT experiments on 220 nm thick semectic liquid crystal films reveal structure related dynamics. The SMT experiments on ultrathin TEHOS films were complemented by fluores

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Moreira, Ana Sofia Pereira. "Study of modifications induced by thermal and oxidative treatment in oligo and polysaccharides of coffee by mass spectrometry." Doctoral thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/17074.

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Doutoramento em Bioquímica<br>Os polissacarídeos são os componentes maioritários dos grãos de café verde e torrado e da bebida de café. Os mais abundantes são as galactomananas, seguindo-se as arabinogalactanas. Durante o processo de torra, as galactomananas e arabinogalactanas sofrem modificações estruturais, as quais estão longe de estar completamente elucidadas devido à sua diversidade e à complexidade estrutural dos compostos formados. Durante o processo de torra, as galactomananas e arabinogalactanas reagem com proteínas, ácidos clorogénicos e sacarose, originando compostos castanh

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"Evaluation of the molecular weight and molecular weight distribution of a water-insoluble polysaccharide--Curdlan." 2003. http://library.cuhk.edu.hk/record=b5891561.

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Tang Kwan-Yee.<br>Thesis submitted in: September 2002.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2003.<br>Includes bibliographical references (leaves 86-94).<br>Abstracts in English and Chinese.<br>TABLE OF CONTENTS --- p.i<br>LIST OF FIGURES --- p.v<br>LIST OF TABLES --- p.viii<br>ABSTRACT --- p.ix<br>ACKNOWLEDGEMENT --- p.xiii<br>DECLARATION --- p.xiv<br>ABBREVIATIONS --- p.xv<br>Chapter CHAPTER ONE --- INTRODUCTION<br>Chapter 1.1. --- Structure and conformation of Curdlan --- p.1<br>Chapter 1.2. --- Important of Curdlan --- p.3<br>Chapter 1.3. --- Conventional methods o

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Saraf, Manish Kumar. "Polymerization of vinylidene fluoride in supercritical carbon dioxide molecular weight distribution /." 2001. http://www.lib.ncsu.edu/etd/public/etd-225018191010113220/etd.pdf.

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"A study of molecular weight (MW) and molecular weight distribution (MWD) of water-insoluble polysaccharides in ganoderma lucidum using MALDI-MS." 2004. http://library.cuhk.edu.hk/record=b5891889.

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Sun Baizhong.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2004.<br>Includes bibliographical references (leaves 75-79).<br>Abstracts in English and Chinese.<br>ABSTRACT --- p.i<br>ABSTRACT (IN CHINESE) --- p.ii<br>TABLE OF CONTENTS --- p.iii<br>LIST OF FIGURES --- p.v<br>LIST OF TABLES --- p.vii<br>ABBREVIATIONS --- p.vi<br>ACKNOWLEDGEMENT --- p.ix<br>DECLARATION --- p.x<br>Chapter CHAPTER ONE --- INTRODUCTION<br>Chapter 1.1 --- Polysaccharides --- p.1<br>Chapter 1.2 --- Pharmacological importance of polysaccharides --- p.2<br>Chapter 1.3 --- Polysaccharides from Ganoderma L

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Yao, Yi-Chun, and 姚逸駿. "Effect of Pre-oxidation on Molecular Weight Distribution by H2O2/UV Process." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/23119750490198193178.

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碩士<br>淡江大學<br>水資源及環境工程學系<br>89<br>The wastewater samples studied in this paper were taken from the secondary effluent of a textile wastewater treatment plant. The experiments were conducted in a UV reactor under different conditions, including pH, H2O2 dosage, and UV intensity. At different time intervals, the treated wastewater samples were withdrawn for the analyses of residual DOC, color, and the size distribution of organic molecules. Results show that HO‧ reacts with the color-forming species much faster than with the carbonate species. Hence, if the color removal is the main f

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Lyons, Karen. "The distribution of large molecular weight plasmids and plasmid genomics in Salmonella." 2009. http://purl.galileo.usg.edu/uga%5Fetd/lyons%5Fkaren%5Fm%5F200912%5Fms.

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Thompson, Duncan. "Modeling of Molecular Weight Distributions in Ziegler-Natta Catalyzed Ethylene Copolymerizations." Thesis, 2009. http://hdl.handle.net/1974/1896.

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The objective of this work is to develop mathematical models to predict molecular weight distributions (MWDs) of ethylene copolymers produced in an industrial gas-phase reactor using a Ziegler-Natta (Z-N) catalyst. Because of the multi-site nature of Z-N catalysts, models of Z-N catalyzed copolymerization tend to be very large and have many parameters that need to be estimated. It is important that the data that are available for parameter estimation be used effectively, and that a suitable balance is achieved between modeling rigour and simplification. In the thesis, deconvolution analysis is

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Ma, Mau-Fang, and 馬茂芳. "Studies on the Molecular Weight Distribution and Characteristics of Retorted Protein Hydrolysate from Achatina fulica Foot Muscle." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/26334668377617537352.

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碩士<br>國立高雄海洋科技大學<br>水產食品科學研究所<br>99<br>Protein hydrolysates from Achatina fulica foot muscle was extracted by high-temperature hydrolysis (121℃, 15-90 min) to obtain a retorted Achatina fulica protein hydrolysates (RAFPH). RAFPH obtained at 60 min was selected to further hydrolyzed with three enzymes (e.g. papain, tripsin, and alcalase) The RAFPH and enzymatic-treated RAFPH was analyzed for their degree of hydrolysis, molecular weight distribution, soluble protein, peptide content, antioxidant capacity, together with measurement of cholesterol-micelles disintegration , fat adsorption, emulsio

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Chang, Chih-Tang, and 張志堂. "The Infuence of Cultivation Conditions on the Formation of Ganoderma Lucidium Polysaccharide and It''s Molecular Weight Distribution." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/53640403935309163614.

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碩士<br>東海大學<br>化學工程學系<br>91<br>In this research, the submerged cultures of Ganoderma lucidium were carried out in shake flasks and a fermentor to study the effect of the medium composition and the environmental factors on the production of mycelia, extracellular polysaccharide and the mycelia morphology. In addition, the influence of different cultivation conditions on the molecular weight of polysaccharide was also investigated. Experimental items were divided into the different types and concentrations of C-sources and N-sources, initial pH, temperature, surface aeration

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Chang, Mu-Gen, and 張木根. "Effect of modeling of molecular weight distribution on the linear rheology and polymerization in a pipe-flow reactor." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/30457527614982715980.

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碩士<br>國立中正大學<br>化學工程研究所<br>90<br>The traditional way of modeling the polymerization processes relies largely on empiricisms for obtaining the transport properties, such as viscosity and heat conductivity. In this work, we consider the polymerization of ethylene in a tubular reactor. While all other aspects in the modeling remain unchanged from traditional approaches, the polymer viscosity is estimated from a molecular, rheological theory using two different types of molecular weight distributions that bear the average number and weight molecular weights solved from traditional moment equations

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Chuc, Tran Thi Hong, and 陳紅祝. "Effects of Acid Extraction and Hydrolysis on Amino Acid Composition and Molecular Weight Distribution of Oreochromis aurea Skin Collagen." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/16929277081615570877.

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碩士<br>國立臺灣海洋大學<br>食品科學系<br>100<br>The proximate composition of Oreochromis niloticus skin was analyzed. The contents of moisture, crude protein, lipid and ash of tilapia skin were 33.38%, 32.23%, 4.21% and 0.21%, respectively. Tilapia skin collagen was extracted with 0.5 M acetic acid at room temperature (20 ± 2℃) and 50℃ for 2 to 8 h to obtain acid - soluble collagen (ASC). The viscosity and Brix of room-tempeature extracted and 50℃-extracted ASC increased with extraction time. ASC hydrolyzed at room temperature had lower Brix than that at 50℃. Brix for ASC extracted at 50℃ (ASC-50℃) was from

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Chang, Yu-Her, and 張裕和. "The study of investigating and reducing DBPs based on property and molecular weight distribution (MWD) of organic content in natural water." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/21301725994361725643.

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碩士<br>東海大學<br>環境科學系<br>85<br>Chlorination is the most simple tool for disinfection in drinking water process. Due to the pollution of raw water, which contains high organic substance, may react with chlorine and form so-called disinfection by-products (DBPs). One of the most popular DBPs: Trihalomethane, is confirmed as cancengenic substance since 1974. The precursors of DBPs normally be identified as: humic or fulvic acids. The potential technique may obtain seven categories of either hydr

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"Understanding Viscoelastic Behavior of Asphalt Binders Through Molecular Structure Investigation." Doctoral diss., 2018. http://hdl.handle.net/2286/R.I.50577.

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abstract: Asphalt binder is a complex viscoelastic hydrocarbon, whose performance depends upon interaction between its physical and chemical properties, both of which are equally important to the successful understanding of the material. Researchers have proposed various models linking linear viscoelastic (LVE) and microstructural parameters. However, none of these parameters provide insight into the relationship in the non- linear viscoelastic NLVE domain. The main goals of this dissertation are two fold. The first goal is to utilize the technique of Laser Desorption Mass Spectroscopy (LDMS)

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Al-Saleh, Mohammad A. "Nonlinear Parameter Estimation for Multiple Site-Type Polyolefin Catalysts Using an Integrated Microstructure Deconvolution Methodology." Thesis, 2011. http://hdl.handle.net/10012/5818.

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The microstructure of polyolefins determines their macroscopic properties. Consequently, it is essential to predict how polymerization conditions will affect polyolefin microstructure. The most important microstructural distributions of ethylene/alfa-olefin copolymers made with coordination catalysts are their molecular weight (MWD), chemical composition (CCD), and comonomer sequence length (CSLD). Several mathematical models have been developed to predict these microstructural distributions; reliable techniques to estimate parameters for these models, however, are still poorly developed, espe

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Zolotarevová, Eva. "Otěrové částice polyethylenu v okolí kloubních náhrad - jejich vlastnosti, distribuce a možný mechanizmus jejich nežádoucího biologického působení." Doctoral thesis, 2010. http://www.nusl.cz/ntk/nusl-296101.

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CHARLES UNIVERSITY IN PRAGUE FACULTY OF SCIENCE DEPARTMENT OF BIOCHEMISTRY PRAGUE 2010 Supervisor: Doc. MUDr. Jiří Gallo, PhD. Supervisor-consultant: Prof. RNDr. Gustav Entlicher, CSc. Eva Zolotarevová Summary of PhD Thesis POLYETHYLENE WEAR PARTICLES AROUND TOTAL JOINT REPLACEMENTS - THEIR PROPERTIES, DISTRIBUTION AND POSSIBLE MECHANISM OF THEIR ADVERSE BIOLOGICAL EFFECTS PRAGUE 2010 The research project was supported by the Grant project of National research program II. (no. 2B06096) of the Czech Ministry of Education, Youth and Sports named "Observation and minimization of UHMWPE wear in jo

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Alleman, Bruce Charles. "Molecular weight distributions of total organic halide in an aerated stabilization basin treating paper and pulp wastewater." 1986. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1986_542_sip1_w.pdf&type=application/pdf.

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