Relevant bibliographies by topics / Filler

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Filler'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 September 2023

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Journal articles on the topic "Filler"

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Bokobza, Liliane. "Elastomer Nanocomposites: Effect of Filler–Matrix and Filler–Filler Interactions." Polymers 15, no. 13 (June 30, 2023): 2900. http://dx.doi.org/10.3390/polym15132900.

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The reinforcement of elastomers is essential in the rubber industry in order to obtain the properties required for commercial applications. The addition of active fillers in an elastomer usually leads to an improvement in the mechanical properties such as the elastic modulus and the rupture properties. Filled rubbers are also characterized by two specific behaviors related to energy dissipation known as the Payne and the Mullins effects. The Payne effect is related to non-linear viscoelastic behavior of the storage modulus while the Mullins or stress-softening effect is characterized by a lowering in the stress when the vulcanizate is extended a second time. Both effects are shown to strongly depend on the interfacial adhesion and filler dispersion. The basic mechanisms of reinforcement are first discussed in the case of conventional rubber composites filled with carbon black or silica usually present in the host matrix in the form of aggregates and agglomerates. The use of nanoscale fillers with isotropic or anisotropic morphologies is expected to yield much more improvement than that imparted by micron-scale fillers owing to the very large polymer–filler interface. This work reports some results obtained with three types of nanoparticles that can reinforce rubbery matrices: spherical, rod-shaped and layered fillers. Each type of particle is shown to impart to the host medium a specific reinforcement on account of its own structure and geometry. The novelty of this work is to emphasize the particular mechanical behavior of some systems filled with nanospherical particles such as in situ silica-filled poly(dimethylsiloxane) networks that display a strong polymer–filler interface and whose mechanical response is typical of double network elastomers. Additionally, the potential of carbon dots as a reinforcing filler for elastomeric materials is highlighted. Different results are reported on the reinforcement imparted by carbon nanotubes and graphenic materials that is far below their expected capability despite the development of various techniques intended to reduce particle aggregation and improve interfacial bonding with the host matrix.
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Lee, Jegon, and Hye Jung Youn. "Strengthening effect of polyelectrolyte multilayers on highly filled paper." Nordic Pulp & Paper Research Journal 33, no. 1 (May 23, 2018): 113–21. http://dx.doi.org/10.1515/npprj-2018-3010.

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AbstractPolyelectrolyte multilayering (PEM) treatment is regarded as one of the surface modification techniques to increase paper strength. In this study, the strengthening effect of PEM treatment of highly filled paper was investigated. PEM treatment was performed on both fiber and filler with cationic starch and anionic polyacrylamide systems. Both approaches provided an improvement in the strength of filled paper. However, the strengthening effect of PEM treatment on fibers became weaker as filler content increased, whilst the PEM treatment on fillers was more effective in improving the strength of the highly filled paper. This was because PEM treatment on fillers improved bonding strength between fiber and filler as well as bonding strength between fillers. This was confirmed by the evaluation of specific debonding factor between fiber and filler, and the measurement of the breaking strength of dense film composed of fillers.
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Roy, Kumarjyoti, Subhas Chandra Debnath, and Pranut Potiyaraj. "A critical review on the utilization of various reinforcement modifiers in filled rubber composites." Journal of Elastomers & Plastics 52, no. 2 (March 12, 2019): 167–93. http://dx.doi.org/10.1177/0095244319835869.

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Presently, the development of high-performance filled rubber composites offers a new era in the industrial field of polymer research. This article reviews the utilization of various reinforcement modifiers on the successive property enhancement of rubber composites containing different commonly used fillers like silica, nanoclay, carbon nanotube, natural fibers, and so on. The practical importance of reinforcement modifiers in rubber technology is systematically described in the light of filler dispersion, processing, and mechanical properties of filled rubber compounds. A special emphasis is given on the mechanism of interaction between reinforcement modifiers and filler surface in filled rubber composites. Filler dispersion in the rubber matrix is the key parameter that controls the ultimate performance and rubber–filler interaction of filled rubber system. The use of some fixed reinforcement modifiers is an innovative way not only to solve the dispersion problem of filler particles but also to increase the reinforcing ability of most of the fillers in filled rubber products. Thus, the concept of reinforcement modifiers has the potential to facilitate further development of filler reinforcement technology for rubber-based composite materials.
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Mansor, Mohd Khairulniza, and Ruslimie Che Ali. "Properties Evaluation of Micro-Crystalline Cellulose and Starch as Bio-Filler in Rubber Compounding." Advanced Materials Research 1133 (January 2016): 593–97. http://dx.doi.org/10.4028/www.scientific.net/amr.1133.593.

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Effects of filler loading on the mechanical properties of Epoxidised natural rubber (ENR) filled with bio-fillers were studied. The compounds with different filler loadings (0, 30, 50, 70 phr) were prepared in a Haake internal mixer. Result showed that the viscosity of the compounds increased with filler loading and exhibited longer cure time with higher loading of the bio-filler. The mechanical properties of starch-filled vulcanisates present better tensile strength at 50 phr when compared to micro-crystalline cellulose (MCC) filled vulcanisates at similar filler loadings. The scanning electron microscopy (SEM) of tensile fracture surface of 50 phr starch-filled vulcanisates illustrated a homogenous distribution in comparison with MCC-filled compounds.
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Shen, Jing, Zhanqian Song, Xueren Qian, and Wenxia Liu. "Modification of papermaking grade fillers: A brief review." BioResources 4, no. 3 (July 28, 2009): 1190–209. http://dx.doi.org/10.15376/biores.4.3.1190-1209.

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The use of fillers in paper products can provide cost and energy savings, improved paper properties, increased productivities, and specifically desired paper functionalities. There are many problems associated with the use of fillers, such as unsuitability of calcium carbonate fillers in acid papermaking, negative effects of filler loading on paper strength, sizing, and retention, and tendencies of fillers to cause abrasion and dusting. In order to solve these problems and to make better use of fillers, many methods have been proposed, among which filler modification has been a hot topic. The available technologies of filler modification mainly include modification with inorganic substances, modification with natural polymers or their derivatives, modification with water-soluble synthetic polymers, modification with surfactants, modification with polymer latexes, hydrophobic modification, cationic modification, surface nano-structuring, physical modification by compressing, calcination or grinding, and modification for use in functional papers. The methods of filler modification can provide improved acid tolerant and optical properties of fillers, enhanced fiber-filler bonding, improved filler retention and filler sizabilities, alleviated filler abrasiveness, improved filler dispersability, and functionalization of filled papers. Filler modification has been an indispensable way to accelerate the development of high filler technology in papermaking, which is likely to create additional benefits to papermaking industry in the future.
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Basha, U. Mahaboob, D. Mohana Krishnudu, P. Hussain, K. Manohar Reddy, N. Karthikeyan, and M. Ashok Kumar. "Synthesis and Characterization of Natural Fibers Reinforced Fiber Epoxy Composites." International Letters of Chemistry, Physics and Astronomy 51 (May 2015): 47–53. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.51.47.

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In the current work epoxy resin is chosen as matrix, treated Sacharum offinarum ( SugarCane) fiber, Pennisetum typhoides (Jowar)/ Fillet miller (Ragi) filler are chosen as reinforcement. Room temperature cured Epoxy System filled with Sacharum offinarum fiber and Pennisetum typhoides (Jowar)/ Fillet miller (Ragi) filler are synthesised by mechanical shear mixer, then kept in a Ultra sonic Sonicator for better dispersion of Pennisetum typhoides (Jowar)/ Fillet miller (Ragi) filler in the matrix. Different weights of modified Pennisetum typhoides (Jowar)/ Fillet miller (Ragi) filler (1,2,3,4,5 gm wt) has been incorporated into the Epoxy matrix in order to study the variation of Mechanical and Thermal properties.
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Basha, U. Mahaboob, D. Mohana Krishnudu, P. Hussain, K. Manohar Reddy, N. Karthikeyan, and M. Ashok Kumar. "Synthesis and Characterization of Natural Fibers Reinforced Fiber Epoxy Composites." International Letters of Chemistry, Physics and Astronomy 51 (May 15, 2015): 47–53. http://dx.doi.org/10.56431/p-068o68.

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In the current work epoxy resin is chosen as matrix, treated Sacharum offinarum ( SugarCane) fiber, Pennisetum typhoides (Jowar)/ Fillet miller (Ragi) filler are chosen as reinforcement. Room temperature cured Epoxy System filled with Sacharum offinarum fiber and Pennisetum typhoides (Jowar)/ Fillet miller (Ragi) filler are synthesised by mechanical shear mixer, then kept in a Ultra sonic Sonicator for better dispersion of Pennisetum typhoides (Jowar)/ Fillet miller (Ragi) filler in the matrix. Different weights of modified Pennisetum typhoides (Jowar)/ Fillet miller (Ragi) filler (1,2,3,4,5 gm wt) has been incorporated into the Epoxy matrix in order to study the variation of Mechanical and Thermal properties.
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Joseph, S., V. A. Bambole, and P. A. Mahanwar. "Mechanical Properties of Poly(ether ether ketone) Composites Reinforced by Carbon Nano-Platelet Chains and Nanoalumina." Journal of Thermoplastic Composite Materials 24, no. 6 (July 29, 2011): 755–66. http://dx.doi.org/10.1177/0892705711403638.

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Carbon nanoplatelet and nanoalumina reinforced PEEK nanocomposites were fabricated by twin-screw extrusion followed by injection molding. The effect of the filler loading on mechanical properties, morphology, dielectric strength, and thermal stability of the composites has been analyzed. The mechanical properties were found to increase with nanoplatelet content up to 1% loading (optimum filler content) and after that, due to agglomeration of filler, slight decrease in properties were observed. For alumina-filled systems mechanical properties increased with increasing filler content due to the well-dispersed fillers in the composites. The modulus and toughness of alumina-filled composites were higher than platelet-filled composites.
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Choi, Jae Hyun, Bong Goo Choi, Min A. Lee, and Jae Sik Na. "Development of Epoxy/BN Composites with High Thermal Conductivity for Metal-Core Printed Circuit Board (MCPCB)." Applied Mechanics and Materials 749 (April 2015): 290–94. http://dx.doi.org/10.4028/www.scientific.net/amm.749.290.

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The epoxy composites with high thermal conductivity for metal-core printed circuit board (MCPCB) can be prepared by varnish coating and a hot press method. Alumina filler of plate-like shape was used as primary micro-filler, while plate-like alumina filler, h-BN, a-BN and s-BN filler were used for blending into the plate-like alumina filler as the secondary filler. Results showed that the secondary fillers a-BN and s-BN loaded epoxy composites have higher thermal conductivity than alumina filler single-loaded composites. Also, BN filler has high thermal conductivity, but h-BN filled epoxy composite has lower thermal conductivity than alumina filled epoxy composite. The decrease of voids in epoxy composite are very important, and the filler shape and surface modification is also necessary to achieve high thermal conductivity in epoxy composite for MCPCB
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Ray, Sudip, Anil K. Bhowmick, and S. Bandyopadhyay. "Atomic Force Microscopy Studies on Morphology and Distribution of Surface Modified Silica and Clay Fillers in an Ethylene-Octene Copolymer Rubber." Rubber Chemistry and Technology 76, no. 5 (November 1, 2003): 1091–105. http://dx.doi.org/10.5254/1.3547789.

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Abstract Topographic and phase imaging in tapping mode atomic force microscopy (TMAFM) has been performed to investigate the effect of surface modification of silica and clay fillers on the morphology and the microdispersion of the filler particles in the rubber matrix. The above fillers have been modified by using surface coating agents like an acrylate monomer (trimethylolpropane triacrylate, TMPTA) or a silane coupling agent (triethoxy vinylsilane, TEVS) followed by electron beam modification at room temperature. Both unmodified and surface modified fillers have been incorporated in an ethylene-octene copolymer rubber. The phase images of the above composites elucidate the reduction in aggregate size due to the filler surface modification, which is more pronounced in the case of silane modification. The results obtained from the section analysis and the histogram of the filler distribution further corroborate the above findings. The corresponding topographic images are characterized by various statistical quantities like roughness parameters and two-dimensional power spectral density (2-D PSD). As compared to the control silica and clay filled rubbers, a noticeable reduction in the surface roughness is observed in the case of modified filled composites. Thus, the whole study based on AFM suggests that the surface modification of the above fillers significantly reduces the filler-filler interaction, which in turn reduces the filler aggregate size and helps in improving the filler dispersion.
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Dissertations / Theses on the topic "Filler"

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Matyumza, Ntombozuko C. "Improved filler retention by co-flocculation of fines and filler particles." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/37370.

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Thesis (MScFor)--Stellenbosch University, 2005.
ENGLISH ABSTRACT: The retention of filler particles and drainage are important aspects of papermaking. A number of important paper properties depend in the quality and quantity of filler retained in the paper. Fines, fillers and pulp fibres all have a negative charge and are kept apart by electrostatic forces. This causes a decrease in the effectiveness of cationic retention aids thereby causing a high cationic demand. This in turn implies that the retention of fines and filler particles in a formed sheet is not efficient, especially in the presence of anionic trash. In order to improve printability, print quality and dimensional stability, a large percentage of mineral pigments / fillers either in the form of internal loading or external coating should be added. It was found that coflocculation of fines and filler particles resulted in an even distribution of filler particles in the form of miero-flocs and the filler retention was maintained. Opacity was improved without much reduction in paper strength. An increased filler content without coflocculation of fines reduced sheet strength properties. The filler particles interfered with the development of fibre-to-fibre bonds and occupied spaces that otherwise might have contained fibres. This study showed that the most beneficial effect of coflocculation of filler with fines was obtained, with regards to paper strength, opacity, filler retention and printability, when the charge of the fibre furnish was maintained at -0.1 leu with the 0.1% addition of cationic PAM retention aid.
AFRIKAANSE OPSOMMING: Twee belangrike aspekte van papiervervaardiging is die retensie van vulstowwe en ontwatering. 'n Aantal belangrike papiereienskappe is afhanklik van die hoeveelheid en kwaliteit van vulstowwe wat in papier voorkom. Veselpuin, vulstowwe en pulp-vesels is almal negatief gelaai, gevolglik verseker elektrostatiese kragte dat hierdie deeltjies los van mekaar bly. Laasgenoemde verminder die doeltreffendheid van kationiese retensiemiddels en dit gee aanleiding tot 'n hoë kationiese aanvraag. Die retensie van veselpuin en vulstof deeletjies in papier is gewoonlik nie voldoende in die teenwoordigheid van anioniese afvalkomponente nie. Om aan papier verbeterde drukeienskappe, drukkwaliteit en dimensionele stabiliteit te gee, moet 'n groot persentasie minerale pigmente en/of vulstowwe as 'n interne lading of eksterne bestryking voorsien word. Daar is bevind dat kot1okkulasie van fynstowwe en vulstofdeeltjies, 'n egalige verspreiding van vulstof-partikels as mikro-t1okke tot gevolg het en dat vulstof-retensie op aanvaarbare vlakke behou is. Ook is ondeurskynendheid verbeter sonder 'n beduidende verswakking in die papiersterkte. 'n Toename in vulstofinhoud, sonder kot1okkulasie van fynstowwe, het die papier sterkte-eienskappe verlaag. Vulstofdeeltjies bëinvloed die ontwikkeling van vesel-tot-vesel binding. Hierdie deeltjies beset ruimtes wat andersins deur vesels benut sou word. Hierdie studie het getoon dat die voordeligste effek van kot1okkulasie van vulstowwe met fynstowwe verkry is, ten opsigte van papiersterkte, ondeurskynendheid, vulstof retensie en drukeienskappe, wanneer die lading van die pulpsuspensie by -0.1 leu gehou was met 'n byvoeging van 0.1% kationiese PAM retensie-hulpmiddel.
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Gavroňová, Ivana. "Příprava a charakterizace vysoce plněných kompozitních systémů pro stomatologické aplikace." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2017. http://www.nusl.cz/ntk/nusl-295702.

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Master thesis deals with highly filled particulate composite materials for dental applications. In the practical part, the dimetacrylate matrix was filled with a mixture of particles of different types and different sizes to achieve the maximum possible packing. Moreover, filler content and the influence of filler on composite material was studied. Hydrolytic stability was also tested on composite materials. The methods used to characterize composite materials were bending test, thermogravimetric analysis (TGA), differential scanning photocalorimetry (DPC), dynamic-mechanical analysis (DMA) and scanning electron microscopy (SEM). Curing of the matrix was characterized by the degree of conversion, the heat of polymerization and the polymerization rate. Furthermore the polymerization shrinkage was measured. The glass transition temperature, the dynamic modulus at 40 °C and 100 °C, the modulus of elasticity, the strength, the critical value of the stress factor and the critical energy release rate were found in the tested samples.
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Hon, Amir Adam. "Modelling filler reinforcements in elastomers." Thesis, Queen Mary, University of London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420623.

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Kadlček, Jakub. "Hodnocení vlastností drobného kameniva pro asfaltové směsi." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-401473.

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The diploma thesis is focused on evaluation of properties of fine aggregate by means of laboratory tests. Fine aggregate evaluation was performed using sieving test, laser diffraction, delta ring and ball test, bitumen number test, uncompacted void content of fine aggregate according to AASHTO T 304, voids of dry compacted filler (Rigden) test and particle density of filler. Laboratory research has led to the discovery of some properties of fine aggregate and their dependencies.
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Jha, Vineetkumar. "Carbon black filler reinforcement of elastomers." Thesis, Queen Mary, University of London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510795.

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Wang, Xuyang. "Filler effects in resole adhesive formulations." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/82499.

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This was a university/industry research cooperation with focus on how organic fillers affect the properties of phenol-formaldehyde resole (PF) resins that are formulated for veneer applications like plywood and laminated veneer lumber. The PF formulations studied in this work used fillers that were derived from walnut shell (Juglans regia), alder bark (Alnus rubra), almond shell (Prunus dulcis), and corn cob (furfural production) residue. The chemical composition of all fillers was measured and compared to published data. The basic rheological behavior of the formulations was determined and used to develop an adhesive tack measurement based upon lubrication theory. In this work, the probe-tack test was adapted to a typical stress-controlled rheometer by using the normal force and displacement system to compress the adhesive between parallel plates. By employing a simple power law to describe the complex rheology of adhesives and a lubrication approximation for the viscous force, squeeze flow of adhesives between two flat, impermeable steels and between steel and porous wood can be successfully modeled. However, deviations from theory were encountered as related to the method of adhesive application. Both meniscus force in consequence of the surface tension of adhesive pull around the edge of plate and viscous force due to the viscosity of adhesive operate inside the meniscus when adhesive was spread on the entire surface by a hard roller. manufacture where viscosity and surface tension effects were both involved. Last but not Such is probably the case when wood veneer is cold-pressed (pre-pressed) in plywood least, rheological behavior and alkali modification of wheat flour was determined by rheological and infrared studies, respectively.
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Mills, Stephen Leslie. "Assessment of filler dispersion using fractal analysis and its potential effect on the properties of polymer/filler composites." Thesis, Manchester Metropolitan University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298186.

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A novel technique for the assessment of dispersion quality in polymeric composites containing high levels of mineral filler or mixtures of different fillers is described. A comprehensive survey of the literature indicates that current methods of assessment using a combination of microscopy and image analysis are reliant on object specific measures which require good contrast between filler particles and the surrounding polymeric matrix. Such methods are inappropriate for the investigation of highly filled systems due to the presence of touching particles and poorly defined feature boundaries. The method described in this report uses characteristic X-rays or backscattered electron (BSE) imaging for the visualisation of filler dispersion patterns. The X-ray technique is especially useful for the discrimination of individual fillers in a multicomponent system. Multifractal analysis of X-ray or BSE images provides a quantitative description of dispersion quality using a numerical indicator derived from the width of the multifractal spectrum. The technique is successfully demonstrated on a series of flame retardant filler-EVA composites containing different amounts of ATH and Mg(OH)2. Linear models were constructed to illustrate the dependence of composite tensile strength and elongation at break on compound formulation and dispersion quality. Optimum material properties were observed for composites displaying good dispersion quality and predicted mechanical properties were compared against experimentally measured data. A positive correlation was found between real test data and predicted values. This technique provides a unique method for the dispersion assessmenot f mineral filled systems and can be performed on any SEM equipped with an EDX spectrometer and access to a PC running image analysis software. It is a useful addition to the current procedures available for the measurement of dispersion quality and should prove invaluable for the study of filled polymer systems.
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Fowler, Grant E. "Assessing the role of filler atoms in skutterudites and synthesis and characterization of new filled skutterudites." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001708.

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Tauban, Mathieu. "Impact of Filler Morphology and Distribution on the Mechanical Properties of Filled Elastomers : theory and simulations." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1069/document.

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Les nanocomposites présentent des propriétés uniques dont l'origine est sujette à débat. Dans ce travail, nous cherchons à déterminer quel est l'impact de la morphologie de la charge et de son état de distribution sur les propriétés des matériaux. Pour cela, nous avons étendu un modèle théorique que nous résolvons numériquement.Nous avons étudié l'effet de la distribution des charges dans la matrice. Nous montrons qu'un état de distribution fortement hétérogène conduit à un renforcement plus important qui s'étend dans une plus large gamme de températures, mais augmente aussi la dissipation d'énergie. Ensuite, nous étudions l'effet de la structure des charges. Des particules parfaitement sphériques sont comparées à des agrégats fractals plus ou moins finement définis. Nous montrons que des objets finement définis peuvent s'imbriquer au sein de la matrice et conduisent à une augmentation du renfort et de la dissipation dans ces matériaux.Puis, nous étudions la réponse de nos systèmes lorsqu'ils sont soumis à une première élongation de forte amplitude. Nous montrons alors qu'un système hétérogène se plastifie localement progressivement au cours de la déformation alors qu'un système homogène présente une plastification catastrophique généralisée à partir d'une déformation critique. Enfin dans une dernière partie nous évaluons la possibilité d'étendre le modèle afin de simuler l'endommagement des nanocomposites. Nous introduisons pour cela un critère rupture local afin de prendre en compte l'endommagement du polymère entre les charges. Nous étudions ensuite comment se comportent les matériaux simulés en faisant varier la morphologie de la charge, son état de distribution et son taux.Ce travail constitue la première étude systématique de l'effet de la morphologie et de la distribution des charges sur les propriétés mécaniques des nanocomposites. Nous montrons que ces paramètres peu contrôlés sont pourtant des paramètres clés et peuvent servir à optimiser les propriétés d’usage d'un nanocomposite
Nano-filled elastomer composites are used in a very broad range of applications such as tires, damping materials and impact modifiers. The addition of nanoscale rigid particles in a polymer matrix induces nonlinear effects that are not yet fully understood far above the glass transition temperature of the pure matrix. A model of the reinforcement of nanocomposites based on the reduced mobility of the polymer confined between two spherical filler particles has been developed over the last ten years. In order to study the influence of the filler shape, structure, size, and dispersion state, we have extended the model were the morphology of the fillers is defined explicitly as spherical particles aggregated in the polymer matrix. The model is then solved by mesoscale numerical simulation in order to describe the mechanical properties of the nanocomposite. We study the mechanical response of nanocomposite filled with aggregates of different shapes and distribution state to deformations of various amplitudes in the reinforcement regime. We show that the mechanical behavior of nanocomposites strongly depends on the filler morphology and we propose that stress-relaxation mechanisms in the material are related to the disorder (particle size, aggregation number, distribution state) in the filler population. In a second part of this work, we study the mechanical response at larger amplitude in both a non-destructive and destructive regime. For that matter, the model has been extended in order to account for damaging of the polymer between filler particles.Our model opens the path for the development of systems with tailored properties by adjusting the fillers morphology and distribution
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Rocha, Chrystianne. "Gap filler adaptativo para sistema ISDB-Tb." Universidade Presbiteriana Mackenzie, 2014. http://tede.mackenzie.br/jspui/handle/tede/1440.

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Made available in DSpace on 2016-03-15T19:37:50Z (GMT). No. of bitstreams: 1 Chrystianne Rocha.pdf: 2924776 bytes, checksum: a1d74db138a8b87f0518f3a6ef67c404 (MD5) Previous issue date: 2014-08-07
This master thesis presents the proposal of assigning the cognitive ability to a gap filler. Differently from the usual repeaters found on the market, the adaptive gap filler is able to automatically monitor tuned channels with the intention of verifying if the protection ratio described in Resolution nº398 from Anatel is being respected. Spectrum sensing techniques and the concepts related to coverage area will be addressed. Tests were carried out on the Matlab and GNU Radio Software with the purpose of analyzing the adaptive gap filler performance on real channels.
Este trabalho apresenta a proposta de atribuir ao gap filler a capacidade cognitiva . Diferentemente dos repetidores encontrados no mercado, o gap filler adaptativo tem como função monitorar, de forma autônoma, os canais sintonizados para verificar se a relação de proteção descrita na Resolução nº 398 da Anatel está sendo respeitada. Como fundamentos dessa proposta são abordadas as técnicas de sensoriamento do espectro e os conceitos relacionados às áreas de cobertura. Em uma abordagem prática, os testes foram desenvolvidos no Matlab e no GNU Radio, em que se analisa a atuação do gap filler adaptativo em canais reais.
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Books on the topic "Filler"

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Koh, Ik Soo, and Won Lee. Filler Complications. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6639-0.

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Lee, Won. Safe Filler Injection Techniques. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6855-5.

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Lee, Won. Regional Filler Injection Techniques. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9989-4.

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American Welding Society. Technical Dept. and American Welding Society, eds. Filler metal comparison charts. Miami, Fla: American Welding Society, 1989.

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American Welding Society. Technical Dept., ed. Filler metal comparison charts. Miami, Fla: American Welding Society, 1999.

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Filler çapraz gider. Roman. Istanbul: Yitik Ülke Yayınları, 2022.

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Snozzi, Philippe, and Jani van Loghem. Soft Tissue Filler Complications. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003370154.

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Mittal, Vikas, ed. Spherical and Fibrous Filler Composites. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527670222.

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Thiels, Kathleen. Botox, Facelift, Filler und Co. Berlin, Heidelberg: Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-66505-3.

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Capella, B., M. Geuss, M. Klüppel, M. Munz, E. Schulz, and H. Sturm, eds. Filler-Reinforced Elastomers Scanning Force Microscopy. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-36438-2.

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Book chapters on the topic "Filler"

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Morita, Hiroshi. "Filler-Filled Rubbers." In Computer Simulation of Polymeric Materials, 269–81. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0815-3_17.

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Greco, M., T. Vitagliano, and A. Greto Ciriaco. "Filler." In International Textbook of Aesthetic Surgery, 1083–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-46599-8_73.

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Weik, Martin H. "filler." In Computer Science and Communications Dictionary, 607. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_7155.

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Gooch, Jan W. "Filler." In Encyclopedic Dictionary of Polymers, 303. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_4905.

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Kreyden, Oliver Ph, and Tatjana Pavicic. "Filler." In Fortschritte der praktischen Dermatologie und Venerologie 2012, 381–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-24767-5_60.

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Lacayo-Pineda, Jorge. "Filler Dispersion and Filler Networks." In Encyclopedia of Polymeric Nanomaterials, 1–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-36199-9_291-1.

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Lacayo-Pineda, Jorge. "Filler Dispersion and Filler Networks." In Encyclopedia of Polymeric Nanomaterials, 771–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-29648-2_291.

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Koh, Ik Soo, and Won Lee. "Classification of Filler Complications." In Filler Complications, 1–26. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6639-0_1.

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Koh, Ik Soo, and Won Lee. "Hyaluronic Acid Filler and Hyaluronidase." In Filler Complications, 27–40. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6639-0_2.

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Koh, Ik Soo, and Won Lee. "Filler-Induced Hypersensitivity Inflammation and Granuloma." In Filler Complications, 41–51. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6639-0_3.

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Conference papers on the topic "Filler"

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Han, Jun, Lingyu Sun, Lijun Li, Bincheng Huang, Xudong Yang, and Taikun Wang. "3D Numerical Model for Prediction of Percolation Threshold and Piezoresistive Characteristics of Conductive Polymer Filled With CNT." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86528.

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As a kind of functional materials, conductive polymer matrix composites filled with carbon nanotube (CNT) has potential application in structural health monitoring. A good formula should have a low percolation threshold and high piezoresistive strain sensitivity, which are always being sought by costly and time-consuming experimental method. Up to date, there is still a lack of numerical models to predict the sharp transition moment in electrical conductivity and mechanical resistance characteristics. This paper aims to establish a three-dimensional (3D) numerical model to observe the conductive network formation, predict the percolation threshold and investigate the piezoresistive characteristics of CNT-filled polymer matrix composites. Additionally, the influence of filler size, filler shape and filler volume fraction on the percolation threshold and piezoresistive characteristics would be investigated. The modeling and numerical simulation method can not only provide theoretical guidance for such a functional composite material, but also could be used in the future study on design and preparation of other conductive composites with two fillers added to improve the piezoresistive strain sensitivity and to decrease the percolation threshold.
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Raza, Kabeer, Syed Sohail Akhtar, Abul Fazal M. Arif, and Abbas Saeed Hakeem. "An Improved Predictive Model for Effective Thermal Conductivity of Polymer Composites With Non-Dilute Filler Concentrations." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10960.

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Abstract Most of the predictive models for thermal conductivity of composites are derived based on the assumption that the filler concentration in the matrix is dilute. This assumption leads to inaccurate predictions when filler concentration is essentially non-dilute and hence there is a need to propose a model that could handle a non-dilute filler concentration. In this work an improved and realistic model for effective thermal conductivity of polymer matrix composites with non-dilute filler’s concentrations is derived and validated by experiments. The proposed model can handle fillers with variable size and shapes. The derivation is based on the Bruggeman’s differential effective medium theory where the high volume fractions can be obtained by incrementally adding ‘small volume fractions’ into the ‘existing composite’ at each stage. The proposed model is validated by experimentally produced different series of ceramic particles-polymer composites. Differently sized and shaped alumina (Al2O3) & aluminum nitride (AlN) particulate fillers, and high density polyethylene (HDPE) & polypropylene (PP) matrices were used as the variable ingredients. Using different combinations of filler, matrix and particle size six different series of composites were produced with variable filler concentrations up to 50% by volume. The microstructure of the produced samples was studied by field emission scanning electron microscope to relate the morphology with the predictions. The predictions of proposed model are found in close agreement with the measured thermal conductivities. To understand the detailed effects of different parameters, parametric studies are presented and discussed. It is found that aspect ratio of particulate fillers is the most sensitive parameter to enhance effective thermal conductivity. Overall, the proposed model is proven to be useful in composite material design for heat transfer applications. It is expected that the proposed model will open new doors for the researchers and polymer composite industry to develop new composite designs for achieving ultrahigh thermal conductivities.
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Ramos, Maximiano V., Armstrong Frederick, and Ahmed M. Al-Jumaily. "Nano-Filled Polymer Composites for Biomedical Applications." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67759.

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Polymer nanocomposites offer various functional advantages required for several biomedical applications. For example, polymer nanocomposites are biocompatible, biodegradable, and can be engineered to have mechanical properties suitable for specific applications. The key to the use of polymer nanocomposites for different applications is the correct choice of matrix polymer chemistry, filler type, and matrix-filler interaction. This paper discusses the results of a study in the processing and characterization of nono-filled polymer composites and focuses on the improvement of its properties for potential biomedical applications. The experimental procedure for the preparation of nano-filled polymer composite by ultrasonic mixing is described. Different types of nanofillers and polymer matrix are studied. Effects of processing parameters such as percent loading of fillers, mixing time on the mechanical properties of the composites are discussed. Preliminary results indicate improvement in shear and flexural properties, tensile and compressive properties, were observed in the prepared composites for some processing conditions.
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Leong, Yew Wei, Supaporn Thumsorn, Asami Nakai, Hiroyuki Hamada, Kohji Yoshinaga, and Hiroshi Ito. "Particle Distribution and Mechanical Properties of Silica-Filled PMMA Micro-Injection Moldings." In ASME 2008 International Manufacturing Science and Engineering Conference collocated with the 3rd JSME/ASME International Conference on Materials and Processing. ASMEDC, 2008. http://dx.doi.org/10.1115/msec_icmp2008-72056.

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Micro-injection moldings of poly(methyl methacrylate) filled with silica of various particle sizes ranging from 5 to 50 μm were fabricated. The distribution of the silica particles throughout the moldings was found to be significantly different, i.e. a more homogeneous distribution of fillers was evident as particle size decreases. Fracture properties, fracture surface appearance and transparency were significantly affected by the state of filler distribution.
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Rahman, Md Ashiqur, Javier Becerril, Dipannita Ghosh, Nazmul Islam, and Ali Ashraf. "Non-Destructive Infrared Thermographic Curing Analysis of Polymer Composites." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-96116.

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Abstract Infrared (IR) thermography is a non-contact method of measuring temperature that analyzes the infrared radiation emitted by an object. Properties of polymer composites are heavily influenced by the filler material, filler size, and filler dispersion, and thus thermographic analysis can be a useful tool to determine the curing and filler dispersion. In this study, we investigated the curing mechanisms of polymer composites at the microscale by capturing real-time temperature using an IR Thermal Camera. Silicone polymers with fillers of Graphene, Graphite powder, Graphite flake, and Molybdenum disulfide (MoS2) were subsequently poured into a customized 3D printed mold for thermography. The nanocomposites were microscopically heated with a Nichrome resistance wire, and real-time surface temperatures were measured using different Softwares. This infrared thermal camera divides the target area into 640 × 480 pixels, allowing measurement and analysis of the sample with a resolution of 65 micrometers. Depending on the filler material, the temperature rises to a certain maximum point before curing, and once curing is complete, polymer composites exhibit a rapid temperature change indicating a transition from viscous fluid to solid. MoS2, Polydimethylsiloxane (PDMS) without filler, and PDMS with larger filler are ranked in order of maximum constant temperature. PDMS (without filler) cures in 500s, while PDMS-Graphene and PDMS Graphite Powder cure in about 800s. The curing time for PDMS Graphite flake is slightly longer (950s), while MoS2 is around 520s. Therefore, this technique can indicate the influence of fillers on the curing of composites at the microscale, which is difficult to achieve by conventional methods such as differential scanning calorimetry. This nondestructive, low-cost, fast infrared thermography can be used to analyze the properties of polymer composites with different fillers and dispersion qualities in a variety of applications including precision additive manufacturing and quality control of curable composite inks.
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"Filler." In 2006 IEEE Industrial and Commercial Power Systems Technical Conference - Conference Record. IEEE, 2006. http://dx.doi.org/10.1109/icps.2006.1677311.

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"Filler." In 2006 IEEE Industrial and Commercial Power Systems Technical Conference - Conference Record. IEEE, 2006. http://dx.doi.org/10.1109/icps.2006.1677312.

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"Filler." In 2006 IEEE Industrial and Commercial Power Systems Technical Conference - Conference Record. IEEE, 2006. http://dx.doi.org/10.1109/icps.2006.1677313.

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"Filler." In 2006 IEEE Industrial and Commercial Power Systems Technical Conference - Conference Record. IEEE, 2006. http://dx.doi.org/10.1109/icps.2006.1677314.

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Kawashima, Hiroaki, Takeshi Nishikawa, and Takashi Matsuyama. "Visual filler." In Proceeding of the twenty-sixth annual CHI conference extended abstracts. New York, New York, USA: ACM Press, 2008. http://dx.doi.org/10.1145/1358628.1358895.

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Reports on the topic "Filler"

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EMERSON, JOHN A., JOHN G. CURRO, and FRANK B. VAN SWOL. Optimization of Polymer Filler Materials. Office of Scientific and Technical Information (OSTI), April 2001. http://dx.doi.org/10.2172/780322.

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Primdahl, K. A. MH Test Filler Force Limitations. Office of Scientific and Technical Information (OSTI), October 1990. http://dx.doi.org/10.2172/1031834.

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Rigali, Mark, Eric Lindgren, Mark Phillips, Patrick Burton, and Eduardo Basurto. Accelerated Testing of Selected Filler Compositions. Office of Scientific and Technical Information (OSTI), September 2019. http://dx.doi.org/10.2172/1647436.

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Patchett, B. M., and A. C. Bicknell. L51706 Higher-Strength SMAW Filler Metals. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 1993. http://dx.doi.org/10.55274/r0010418.

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The welding of high strength steels in general, and for pipeline fabrication in particular, has shown that cracking due to hydrogen absorption during welding is more complex in these steels than in older, lower strength steels. In older steels, primary strengthening was accomplished with carbon, which caused hydrogen cracking in the base metal HAZ under reasonably predictable conditions involving microstructure, residual stress and hydrogen level. Pipeline steels were and are in the vanguard of change in strengthening philosophy. The change involves two areas of steel making, chemical composition and deformation processing. Pipeline steels now contain low carbon levels, in many cases less than 0.10%, and the resulting lack of strength is reclaimed by adding higher alloy levels to promote solution hardening (e.g. Mn), precipitation hardening (e.g. Cb, Cu) or transformation hardening (e.g. MO). In addition, alloy elements are added to improve toughness at high strength levels (e.g. Ni). At the same time, improvements have been made in reducing impurity and residual element levels, notably for S, P and O and N. Limitations on the effects of alloying additions on strength and toughness encouraged the use of deformation processing, primarily during rolling, to promote fine-grained microstructures to increase strength andtoughness simultaneously. Electrodes for the SMAW process have been developed for welding high-strength pipeline steels by using core wires made from high-strength microalloyed skelp extruded with cellulosic (Exx10) and low hydrogen (Exx16) flux coatings. The required alloy elements for high-strength deposits were therefore obtained from the core wire and not ferroalloy powders added to the flux, as is standard industrial practice. The idea behind this change was two fold: to avoid the possibility of introducing impurities from the varying sources of ferro alloy powders, including oxygen from the oxidized powder surfaces, and also to provide a closer match of the microalloy level to modern pipeline steel chemistries. The unknowns in this work were the effects of lower impurities/similar alloy content on the mechanical properties in the cast microstructure of a weld, compared to a pipe, and of the effect on electrode welding behaviour of a flux containing no ferro powders other than FeSi.
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Hardin, Ernest, and Patrick Vane Brady. Joint Workplan on Filler Investigations for DPCs. Office of Scientific and Technical Information (OSTI), December 2017. http://dx.doi.org/10.2172/1415013.

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Rigali, Mark. Joint Work Plan for DPC Filler Testing. Office of Scientific and Technical Information (OSTI), March 2021. http://dx.doi.org/10.2172/1771940.

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Rigali, Mark. Progress Report on DPC Cement Filler Development. Office of Scientific and Technical Information (OSTI), March 2021. http://dx.doi.org/10.2172/1773390.

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Brown, Jason. Cryo-GCMS Outgassing Screening: Thermal Filler Materials. Office of Scientific and Technical Information (OSTI), August 2022. http://dx.doi.org/10.2172/1879612.

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Cobb, Wesley. Acoustic Identification of Filler Materials in Unexploded Ordnance. Fort Belvoir, VA: Defense Technical Information Center, April 2006. http://dx.doi.org/10.21236/ada468491.

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Doelle, Klaus. New Manufacturing Method for Paper Filler and Fiber Material. Office of Scientific and Technical Information (OSTI), August 2013. http://dx.doi.org/10.2172/1091089.

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