Dissertations / Theses on the topic 'Engineering preparation'
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Whiteley, Clinton E. "Emergency Preparation and Green Engineering Tool." Thesis, Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/551.
Full textZhang, Rongsheng. "Dextran hydrogel preparation and applications in biomedical engineering." Thesis, University of Bath, 2004. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398371.
Full textDeBiase, Kirstie. "Teacher preparation in science, technology, engineering, and mathematics instruction." Thesis, California State University, Long Beach, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10118901.
Full textThe purpose of this qualitative case study was to gain a better understanding of how induction programs might effectively support STEM K?8 teacher preparation. American schools are not producing competent STEM graduates prepared to meet employment demands. Over the next decade, STEM employment opportunities are expected to increase twice as fast as all other occupations combined. To meet the economic needs, the STEM pipeline must be expanded to educate and produce additional STEM graduates. The meeting of this objective begins with having the teachers working in American classrooms fully prepared and trained in STEM content, curriculum, and pedagogy. Research shows that the interest in STEM subjects starts in elementary school and, therefore, the preparation of elementary teachers to be proficient in teaching STEM to their students is vital. However, most induction programs do not focus on preparing their teachers in STEM. This study researched the Alternative Induction Pathway (AIP) program, which had STEM preparation as one of its core outcomes in the Long Beach Unified School District (LBUSD). It investigated the program?s effectiveness in preparing K?8 teachers with STEM content knowledge, curriculum, pedagogical instruction preparation, and the program elements that contributed the most to their experience in the program and overall STEM preparation as a result. This study was carried out over the course of approximately 6 months. Data included focused interviews with participants as well as analysis of existing documents in order to triangulate perspectives from multiple sources. The AIP program had varied levels of effectiveness in STEM content, curriculum, and pedagogy preparation. Relationships between the induction mentor, the administration, and the participating teacher, when strong and positive, were powerful contributions to the success of the acquisition and integration of the STEM content, curriculum, and pedagogy. The most effective components of the AIP program were the monthly support groups, the curricular resources, and the professional development nights facilitating the teaching and learning process for the participating teacher in STEM integration. The results of this training included examples of well-planned and executed STEM lessons with creative risk-taking, and enhanced confidence for teachers and administrators alike. At the same time, the AIP program had struggles in achieving the desired outcomes of STEM integration, due to lack of preliminary training for program administrators in STEM integration, varied needs between the MS and SS credential teachers, and state standard requirements that spoke to science and mathematics, but not engineering or technology. The main recommendation for policy from the results of this study is that STEM should be woven into preservice and continue through induction and professional development to become one of the main tenets of curriculum development and standards of effective teaching. This policy would affect colleges of education and district induction programs, requiring that STEM courses be added or embedded into the credential pathways. However, this approach would ensure that STEM integration is supported academically as an important and valued aspect of the teacher?s entrance to their career, and that pre-service teachers are ready to take advantage of induction offerings on STEM integration in the induction phase and throughout their careers in continuing professional development. The study also provides practice and research recommendations in regard to possible roles and supports for mentor teachers, including their relationships with resident teachers, as well as suggestions for and to maximize the benefits for effective teaching and learning during the induction process.
Erasmus, Willem Johannes. "Preparation of model cobalt catalysts for Fischer-Tropsch synthesis using ultrasound preparation techniques." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/5335.
Full textIn order to study the oxidation behaviour of small cobalt crystallites during Fischer-Tropsch synthesis, it is necessary to prepare model catalysts with cobalt crystallites of which the size distributions can be adjusted. Here ultrasonication was used to decomposed a tricarbonyl precursor in n-decane to prepare small cobalt crystallites. The aim of this study was to vary the cobalt crystallite size distribution by adjusting the preparation conditions. Transmission Electron Microscopy (TEM) was used to measure the crystallites and to obtain the crystallite size distributions.
Waterbury, Raymond. "The electron microscopy proteomic organellar preparation robot /." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102768.
Full textThe device automates all chemical and mechanical manipulations required to prepare organelles for electron microscopic examination. It has a modular, integrated design that supports automated filtration, chemical processing, delivery and embedding of up to 96 subcellular fraction samples in parallel. Subcellular fraction specimens are extremely fragile. Consequently, the system was designed as a single unit to minimize mechanical stress on the samples by integrating a core mechanism, composed of four modular plates, and seven support subsystems for: (1) cooling, (2-3) fluid handling, (4-7) positioning. Furthermore, control software was developed specifically for the system to provide standardized, reproducible sample processing while maintaining flexibility for adjustment and recall of operational parameters.
Development of the automated process progressed from initial validation experiments and process screening to define operational parameters for preservation of sample integrity and establish a basic starting point for successful sample preparation. A series of successive modifications to seal the local environment of the samples and minimize the effect of fluidic perturbations further increased process performance. Subsequent testing of the robot's full sample preparation capacity used these refinements to generate 96 samples in approximately 16 hours; reducing the time and labor requirement of equivalent manual preparation by up to 1,000 fold.
These results provide a basis for a structured approach toward process optimization and subsequent utilization the device for massive, parallel preparation of subcellular fraction samples for electron microscopic screening and quantitative analysis of subcellular and protein targets necessary for high-throughput proteomics.
Zhang, Huan Ph D. Massachusetts Institute of Technology. "Preparation and applications of catalytic magnetic nanoparticles." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/46672.
Full textIncludes bibliographical references.
It is critical to decontaminate organophosphate compounds in large scale economically, including OP pesticides in groundwater system and chemical nerve agents on the battle field. Homogeneous or micellar decomposition systems with various nucleophiles improve reaction rates significantly without affording the recovery and reuse of the nucleophiles. This research focuses on developing functional magnetic particles to carry strong [alpha]--nucleophilic groups, which are able to catalyze the decomposition reaction and can be recycled and reused.The amidoxime modified magnetic particles were prepared first. The original particles were synthesized with the two-step procedure to obtain average particle size of around 80nm for effective capture by high gradient magnetic separation (HGMS). The precursor molecule cyanoacetohydrazide reacted with the free carboxyl groups on the particle surfaces and subsequently the nitrile groups were transformed into amidoxime groups. The modified particles were of similar average hydrodynamic diameter as the original ones and colloidally stable over a wide range of solutin pH. The amidoxime-modified particles accelerated the hydrolysis reaction of p-nitrophenyl acetate (PNPA). They were easily recycled by HGMS without loss of reactivity. Higher reactivity of the particle system than homogenous amidoxime systems was attributed to the increased concentration of the substrate on the particle surface due to the presence of hydrophobic centers using pseudo-phase exchange model.Stronger nucleophilic groups, hydroxamic acid, were then attached on the particle surfaces. Original particles were prepared with unsaturated carboxylic acid as the second coating in the two-step procedure. The acrylamide monomers were copolymerized with the second coating and the attached amide groups were converted into the hydroxamic acid groups.
(cont.) The reaction was very efficient. Crosslinking increased the particle size to 200nm and therefore the particles were effectively captured by HGMS. The modified particles significantly accelerated the hydrolysis reaction of PNPA. They were five times more reactive than the amidoxime modified particles based on the same weight of materials. The acetylated particles were only partially regenerated due to the Lossen rearrangement of the acetylated hydroxamic acid groups.During the hydrolysis of OP substrates, including diisopropyl fluorophosphate, methylparaoxon and ethyl-paraoxon, the added a-nucleophiles, 2-PAM and acetohydroxamic acid, only attacked the phosphorus atom to substitute the p-nitrophenol groups in methyland ethyl- paraoxon and the fluoride ions in DFP through second order nucleophilic substitution. Reactions between all three substrates and both nucleophiles yielded the same hydrolysis products as the spontaneous hydrolysis with no detected intermediates, indicating the unstable nature of any intermediates that may be formed. The hydroxamic acid modified particles accelerated the hydrolysis of methyl- and ethyl- paraoxon with relatively modest reactivity. Similar to polyhydroxamic acid, the reactivity was much lower than that of monomeric hydroxamic acid due to the steric hindrance from the polymer chains. The particles lost their reactivity after the reaction due to Lossen rearrangement of the phosphoryl hydroxamic acid.
by Huan Zhang.
Ph.D.
Hill, Matthew Raymond. "Preparation of catalyst coated membranes using screen printing." Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/11834.
Full textIncludes bibliographical references.
Of the various types of fuel cells, Polymer Electrolyte Fuel Cells (PEFCs) have already been demonstrated in transportation appliances from light-duty vehicles to buses and in portable appliances including laptops and cell phones. A key component of a PEFC is its platinum electrocatalyst. With an estimated 75% of the world’s platinum reserves and resources in South Africa, local development of this technology will allow South Africa to become a major player in the growing hydrogen economy. This project therefore forms part of the Department of Science and Technologies strategy, to develop fuel cell technology in South Africa. More specifically, this study aims to contribute to the development of membrane electrode assembly (MEA) platform technology at the HySA/Catalysis Centre. In order to achieve this goal, a catalyst coated membrane (CCM) fabrication procedure was implemented using a newly acquired screen printer. In this procedure, catalyst ink is forced through a mesh onto a substrate, where it can then be transferred to a membrane via decal transfer to form a CCM. Two gas diffusions layers can then be placed on either side of the CCM forming a 5-layered MEA. Characterisation techniques of the catalyst ink, CCM and 5-layered MEA were successfully implemented such that future researchers can expand on the ideas. Catalyst inks with varying amounts of isopropanol, 1,2-propanediol and water were screened for their suitability for screen printing. In particular the catalyst ink rheology required for a smooth and even printed surface was determined for a given screen and squeegee combination. With all the established steps in pace, screen printing proved to be a fast and reliable approach for CCM fabrication with potential for future scale up and commercialisation. The fabricated CCMs performed on a par with a commercial Ion Power CCM, but under performed in comparison to a commercial Johnson Matthey (JM) MEA. Possible reasons for this include improved materials in the JM MEA and cell conditions favouring the JM MEA. Future projects which specifically arise from this work entail an investigation into the water management of the fuel cell environment at HySA/Catalysis, as well as a modification of the various steps in order to optimise the process and in doing so manufacture commercially viable MEAs.
Hsu, Hung-Liang. "The preparation and characterisation of porous degradable chitosan structures for tissue engineering." Thesis, Queen Mary, University of London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.528416.
Full textTanahashi, Kazuhiro. "DESIGN AND PREPARATION OF FUMARATE-BASED BIODEGRADABLE POLYMER HYDROGELS FOR TISSUE ENGINEERING." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/124562.
Full textHasson, Dhari A. "Mixture preparation and combustion in spark ignition engines." Thesis, Aston University, 1986. http://publications.aston.ac.uk/11867/.
Full textFowell, Susan Lynne. "The preparation and properties of immunosorbents." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293817.
Full textÅ, iÅ man Güvenç S. 1971. "Design of an automated fiber pigtail preparation machine." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/9390.
Full textNewman, Philip. "The preparation and transportation of paste backfill /." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61309.
Full textBesides waste disposal paste backfill also produces a stronger fill resulting in less dilution, less cement consumption and less clean up costs. These savings can only be realized with an accurate implementation of the new technology.
Presented is an overview of the current state of this emerging technology and the available equipment required for the preparation and transportation of paste backfill. It is hoped this work will provide the reader with a thorough grounding in paste backfill and enable him/her to understand that although large savings are possible the technology is still unproven within the context of the Canadian mining industry and further work is required before paste backfill becomes common practice.
Economic analyses are also presented regarding the different applications of paste at either existing or new mineral developments. Results from strength tests carried out as part of paste backfill feasibility projects are presented and show the increase in uniaxial compressive strength associated with an increase in slurry concentration. (Abstract shortened by UMI.)
Cooper, J. D. H. "Automated sample preparation for high pressure liquid chromatography." Thesis, De Montfort University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292855.
Full textIsikli, Cansel. "Preparation And Characterization Of Chitosan-gelatin/hydroxyapatite Scaffolds For Hard Tissue Engineering Approaches." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12611568/index.pdf.
Full text&bdquo
tissue-like&rdquo
structures or organoids. Chitosan is a linear amino polysaccharide that can provide a convenient physical and biological environment in tissue regeneration attempt. To improve chitosan&
#8223
s mechanical and biological properties, it was blended with another polymer gelatin. 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC) and N-hydroxysuccinimide (NHS) were used to crosslink the chitosan-gelatin matrix to produce stable structures. These natural polymers are mechanically weak especially to serve as a bone substitude and therefore, an inorganic calcium phosphate ceramic, hydroxyapatite, was incorporated to improve this aspect. The objective of this study was to develop chitosan-gelatin/hydroxyapatite scaffolds for a successful hard tissue engineering approach. For this reason, two types of hydroxyapatite, as-precipitated non-sintered (nsHA) and highly crystalline sintered (sHA) were synthesized and blended into mixtures of chitosan (C) and gelatin (G) v to produce 2-D (film) and 3-D (sponge) structures. The physicochemical properties of the structures were evaluated by scanning electron microscopy, X-Ray Diffraction (XRD), Fourier Transform Infrared-Attenuated Total Reflectance spectrometer (FTIR-ATR), differential scanning calorimetry, contact angle and surface free energy measurements and swelling tests. Mechanical properties were determined through tensile and compression tests. In vitro cell affinity studies were carried out with SaOs-2 cells. MTS assays were carried out to study cell attachment and proliferation on the 2-D and 3-D scaffolds. Several methods such as confocal, fluorescence and scanning electron microscopy were used to examine the cell response towards the scaffolds. Cell affinities of the samples were observed to change with changing chitosan-gelatin ratio and hydroxyapatite addition into the matrices. XRD and FTIR results confirmed the purity of the hydroxyapatite synthesized. Mechanical test results showed that 2-D and 3-D chitosan-gelatin/hydroxyapatite constructs have similar properties as bones, and in vitro studies demonstrated that the prepared matrices have the potential to serve as scaffold materials in hard tissue engineering applications.
Walton, Robin S. "Preparation and analysis of type 1/type 11 collagens for tissue engineering scaffolds." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540291.
Full textBalubaid, Eyad Khalid M. "Preparation and Characterization of Porous PDMS for Printed Electronics." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1578073290398846.
Full textQiu, Shuzhen. "Preparation and characterization of Matrimid/P84 blend films." Thesis, Kansas State University, 2014. http://hdl.handle.net/2097/18803.
Full textDepartment of Chemical Engineering
Mary Rezac
Polymeric membranes have been playing important roles in gas or liquid separations. Polyimide polymers are of interest due to their commercially availability along with good transport, thermal and mechanical properties. In this study, two common commercial polyimide polymers, Matrimid and P84 were blended, to combine the good transport property of Matrimid with the plasticization resistance of P84. Matrimid/P84 blend solutions ranging from 0-100 wt. % Matrimid were prepared to make blend films. Physical properties (density, d-spacing, thickness), transport properties (permeability of H2, N2, CH4, Ar, He, CO2, and gas pairs selectivity), thermal property (mass loss curves of TGA), and liquid solutes (water, methanol, toluene, butanol, 1-propanol, 2-propanol) desorption behavior were measured or characterized. Rules of changing behavior of the properties with mass fraction of Matrimid were investigated, summarized, and interpreted mathematically. As Matrimid mass fraction increases, there are more mobility and space between polymer chains, therefore there are smaller density, larger d-spacing, larger fractional free volume (FFV) and larger permeability. The selectivity-permeability relationship follows the trade-off line. Thermal mass loss curve of the blend films in air have presented intermediate characteristic with rising fraction of Matrimid compared to individual polymers. A partial-miscible behavior has been found from the correlation between permeability and FFV. The desorption behavior was found to be reasonably described by the case III model, where the diffusion rate is similar with relaxation rate of polymers.
Haggarty, Allison. "Preparation and characterization of monoclonal antibodies against carcinoembryonic antigen." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74041.
Full textAguilar, Reyes Ena Athenea. "Preparation and characterization of rapid solidified yttria-alumina fibers." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36860.
Full textThermal analysis was performed in order to determine the glass transition, crystallization and phase transformation temperatures. E1 fibers showed two exothermic peaks at 949 and 1040°C that correspond to the crystallization of YAG and delta-Al2O3 phases, respectively, and one small exothermic peak at 1300°C due to the phase transformation of delta-Al 2O3 to alpha-Al2O3. In the case of Y3A5 and E2 fibers, both showed one single exothermic peak at 942 and 939°C due to the crystallization of YAG and YAP cubic phases, respectively. YAP orthorhombic and YAG phases appeared in E2 fibers after heat-treating at 1400°C for 1h with no identifiable exothermic peak in the DTA scan.
Differential thermal analysis was used to study the crystallization phenomena in the as-extracted fibers. The activation energy values were calculated using both Kissinger and Augis-Bennett equations by measuring the variation of the peak temperature in the differential thermal scans with heating rate, and the crystallization mode was identified using the Ozawa analysis. After crystallization, there was a conversion of the transparent glass fiber to an opaque polycrystalline material and both E1 and Y3A5 fibers had a nanocrystalline microstructure with a grain size typically of 100--500 nm. In the case of E2, the grain size was 1--2 mum.
Tensile strengths and elastic moduli of the fibers in the glassy state varied from 606 to 776 MPa and from 95 to 121 GPa, respectively. Furthermore, fibers exhibited brittle fracture initiated from flaws on the fibers surface.
Gao, Feng. "Preparation, Polymerization, and Characterization of Sugar-based Microemulsion Glasses." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186341421.
Full textMathieson, William Bruce. "An electrosensory lateral line lobe slice preparation pyramidal cell electrophysiology." Thesis, University of Ottawa (Canada), 1987. http://hdl.handle.net/10393/5448.
Full textTabe, Mohhamadi Abdulreza. "Preparation of highly selective polyamide membranes for gas separation applications." Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/9834.
Full textGélinas, Stéphanie. "Preparation of magnetic carriers through functionalization of nanosized maghemite particles." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0023/NQ50168.pdf.
Full textPunwani, Karishma. "Automated control of the electron microscopy proteomic organellar preparation robot." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99011.
Full textSantoso, Halim G. (Halim Gustiono) 1975. "Mixture preparation, combustion, and HC emissions at different cranking speeds." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/89880.
Full textLing, Yuanbing 1970. "Direct preparation of alpha-calcium sulfate hemihydrate from sulfuric acid." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84283.
Full textFor the standard preparation procedure of adding lime into hot sulfuric acid, alpha-hemihydrate grows in the c-axis direction much more rapidly than in other directions ending in the form of fine needle crystals. Also, independent of the shape of the seed particles, the resultant crystals of hemihydrate are needle-shaped, which suggests a "dissolution-recrystallization" mechanism. Upon prolonged equilibration in their acid-preparation solution hemihydrate needle-shape crystals become fibrous and eventually convert to anhydrite. It is believed that uptake of SO42- instead of Ca2+ is the rate-determining step in the hemihydrate crystallization process. The hot SO42--rich environment rendered most of the additives (particularly organic) tried ineffective. Trivalent cations such as Fe3+ and Al3+, are the only ones found to modify the crystal morphology from needle-shape to small "grain" type morphology.
Slow addition of H2SO4 solution to slaked lime - reverse procedure was found to favor the production of alpha-hemihydrate with column-shaped as opposed to needle-shaped crystal morphology within otherwise the same operating window, 0.6--1.1M H2SO4. Preliminary assessment of the properties of the alpha-hemihydrate materials synthesized in this work showed them to compare satisfactorily with other materials produced by conversion of dihydrate to hemihydrate.
Jameel, Ambreen. "Molybdenum-phosphate solution chemistry in the preparation of hydrosulphurisation catalysts." Thesis, Manchester Metropolitan University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300354.
Full textBorton, Peter Thomas. "Preparation and Characterization of Manganese Fulleride." University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1354556594.
Full textKeuler, Johan Nico. "Preparation and characterisation of palladium composite membranes." Thesis, Link to the online version, 1997. http://hdl.handle.net/10019/1431.
Full textAntti, Marta-Lena. "Preparation and properties of sapphire/alumina long fibre composites." Licentiate thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16924.
Full textGodkänd; 1999; 20070404 (ysko)
Page, Scott Lawrence. "Sound-induced micromechanical motions in an isolated cochlea preparation." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37926.
Full textIncludes bibliographical references (p. 44-45).
The mechanical processes at work within the organ of Corti can be greatly elucidated by measuring both radial motions and traveling-wave behavior of structures within this organ in response to sound stimuli. To enable such measurements, we have developed a new preparation for observing three-dimensional motions of micromechanical structures in the apical region of an isolated gerbil cochlea. The cochlea is submerged in a low-chloride, low-calcium artificial perilymph solution and cemented to the bottom of a Petri dish at an angle. The bone above scala vestibuli of one half of the apical turn is removed to allow optical imaging with a 40x, 0.8 NA water-immersion objective. Reissner's membrane is left intact. Illumination is provided with a blue LED coupled to an optical fiber. The fiber is positioned next to the bone surrounding scala tympani of the apical turn, so that the organ of Corti is illuminated from below. The resulting optical access allows imaging of a variety of structures that have been proposed to play a role in cochlear mechanics, including inner and outer hair cell bundles, the tectorial membrane, inner and outer pillar cells, and efferent fibers in the tunnel of Corti. In some preparations, individual stereocilia of inner hair cell bundles can be resolved.
(cont.) Motions are stimulated by driving the stapes with a piezoelectric probe, and are measured using a stroboscopic computer microvision system. Measurements of sub-micrometer motions of key structures in three dimensions are quantified, including longitudinal motion of the organ of Corti and relative radial motion between the tectorial membrane and hair cells. Longitudinal motion of the Efferent fibers in the tunnel of Corti is found to have a phase lead with respect to the hair cell bodies. This system enables quantitative studies of both the relative motions of structures within the organ of Corti in response to sound and the propagation of traveling waves along structures within the organ of Corti.
by Scott Lawrence Page.
S.M.
Marques-Garcia, Lourdes. "Preparation and characterisation of nanostructured bulk Bi2Te3 thermoelectric materials using ultrasound milling." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/93575/.
Full textTian, Bo. "Modified electroless plating technique for preparation of palladium composite membranes." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1243.
Full textTang, Qingmeng. "Preparation and Characterization of Electrically Conductive Graphene-Based Polymer Nanocomposites." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1386260373.
Full textKvarnlöf, Niklas. "Activation of dissolving pulps prior to viscose preparation." Doctoral thesis, Karlstad University, Faculty of Technology and Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-1276.
Full textThe conventional viscose manufacturing process is a mature process that needs to be improved with respect to its environmental impact and its production cost structure. Therefore a research study has been done with the aim to improve the reactivity of the dissolving pulp used, in order to reduce the chemical demand in the viscose process and thus reduce the cost and indirectly the environmental impact.
The work described in this thesis has shown that it is possible to enhance the pulp reactivity and to use less carbon disulphide in the production of viscose, while maintaining a good quality viscose dope, by two entirely different pretreatment methods, one chemical and one enzymatic.
The chemical method used pressurized oxygen after the mercerisation step, which increased the reactivity of the alkali cellulose. The viscose dopes produced from the pressurized oxygen treated alkali cellulose had lower filter clogging values, Kw, compared to conventionally produced viscoses. The temperature and the oxygen treatment time of the alkali cellulose were however crucial for the viscose quality.
The best performing enzyme of several tested was a cellulase of the mono component endoglucanase preparation Carezyme®. This enzymatic treatment was optimized with respect to viscose dope preparation. The study showed that the enzyme treatment could be carried out under industrially interesting conditions with respect to temperature, enzyme dose and reaction time. A re-circulation study of the enzyme showed that it was possible to re-use the spent press water from the enzymatic treatment step several times, and thus lower the production cost. Some of the viscose process stages were modified to properly fit the enzymatically treated dissolving pulp and a comparison between viscose made from enzyme-treated pulp and viscose made from conventional pulp, showed that the enzyme-treated samples had a lower filter clogging value, Kw. This indirectly indicates that the enzyme pretreatment could reduce the carbon disulphide charge in the viscose manufacturing process. An initial study of how the Carezyme® influenced different cellulosic sources was also performed.
Smith-Freshwater, Alicia P. "PREPARATION AND CHARACTERIZATION OF AN ELECTROSPUN GELATIN/DENDRIMER HYBRID NANOFIBER DRESSING." VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/19.
Full textAlmlöf, Heléne. "Extended Mercerization Prior to Carboxymethyl Cellulose Preparation." Licentiate thesis, Karlstads universitet, Avdelningen för kemiteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-5947.
Full textQurashi, Muhammad Tariq. "Preparation and characterisation of membranes of chitosan and modified chitosan." Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335584.
Full textDowell, Rachel J. (Rachel Jean). "Registration of 2D ultrasound images in preparation for 3D reconstruction." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10181.
Full textHan, Yang. "Preparation and characterization of a self-crimp side-by-side bicomponent electrospun material." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/2857.
Full textAfkhami, Zarreh Fatemeh. "Delivery of IFNa and VEGF165b by microencapsulated cells: preparation and «in vitro» analysis." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66849.
Full textRÉSUMÉLe IFNα est une cytokine multifonctionnelle avec plusieurs effets physiologiques incluant l'antiangiogenèse effets tandis que le VEGF165b est un antagoniste concurrentiel du récepteur de Vascular Endothelial Growth Factor (VEGF) et empêche avec succès l'angiogenèse. La thèse a pour but de développer un système pour la production simultanée du IFNα et du VEGF165b, de plus, que la livraison soit ciblée pour augmenter les propriétés antiangiogéniques. À cette fin, les cellules HEK293 ont été génétiquement modifiées pour produire simultanément l'IFNα et le VEGF165b. Le potentiel d'une lignée cellulaire HEK293 stable, produisant simultanément le IFNα ou VEGF165b pour livrer en perpétuité le IFNα et VEGF165b après l'encapsulation dans des microcapsules composé de l'alginate-poly-l-lysine-alginate (APA) a été évalué. Pour apporté des améliorations au système, deux mélanges ont été évalué. La co-encapsulation de cellules HEK293 produisant le VEGF165b et de cellules de HEK293 produisant IFNα et un mélange deux types de cellules encapsulées séparément ont été étudiés. Des tentatives ont été également accomplies pour augmenter leur bioactivité (pharmacodynamic) du IFNα en modifiant son O-glycosylation à un emplacement de N-glycosylation et de VEGF165b en augmentant son niveau de sialylation. La bioactivité a été étudiée chez les rats expérimentaux. Les résultats suggèrent que les cellules, HEK293, puissent produire l'IFNα et le VEGF165b simultanément. Ce processus a l'avantage de facilité la manipulation et de maintenir les coûts bas mais est légèrement limité par le fait que la production du d'IFNα et du VEG165Fb ne peut pas être contrôlée. Le microencapsulation de cellules produisant le IFNα ou VEGF165b démontrent que les cellules encapsulées se développent tout en retenant leur capacités de synthèses et demeurent viables d
Kitsopanidis, Ioannis 1975. "Fuel targeting and thermal environment effects onf spark-ignition engine mixture preparation process." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/88849.
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Full textCataloged from PDF version of thesis.
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Nanoparticles are bridge the gap between the micro and atomic scale and have found a variety of different used, especially in the drug-delivery field. This paper will break down some of the mot common methods for polymeric nanoparticle production.
by Benjamin Ryan Pyle.
S.B.
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