Relevant bibliographies by topics / RPET

Academic literature on the topic 'RPET'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "RPET"

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da Silva, Jhonny K. F., Bruna B. Sotomaior, Carolina F. Carneiro, Patrick Rodrigues, Lee Wharton, and Raul Osiecki. "Predicting Lactate Threshold With Rate of Perceived Exertion in Young Competitive Male Swimmers." Perceptual and Motor Skills 128, no. 4 (April 4, 2021): 1530–48. http://dx.doi.org/10.1177/00315125211005227.

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The purpose of this study was to verify the effectiveness of the rate of perceived exertion threshold (RPET) for predicting young competitive swimmers’ lactate threshold (LT) during incremental testing. We enrolled 13 male athletes ( M age = 16, SD = 0.6 years) in an incremental test protocol consisting of eight repetitions of a 100-meter crawl with 2-minute intervals between each repetition. We collected data for blood lactate concentration ([La]) and Borg scale rate of perceived exertion (RPE) at the end of each repetition. The results obtained were: M RPET = 4.98, SD = 1.12 arbitrary units (A.U.) and M lactate threshold = 4.24, SD = 1.12 mmol.L−1, with [La] and RPE identified by the maximal deviation (Dmax) method without a significant difference ( p > 0.05) and large correlations between DmaxLa and DmaxRPE at variables for time (r = 0.64), velocity (r = 0.67) and percentage of personal best time (PB) (r = 0.60). These results suggest that RPET is a good predictor of LT in young competitive swimmers.
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Ghoshal, Rituparna, Sharanjeet Sharanjeet-Kaur, Norliza Mohamad Fadzil, Haliza Abdul Mutalib, Somnath Ghosh, Nor Fariza Ngah, and Roslin Azni Abd Aziz. "Correlation between Visual Functions and Retinal Morphology in Eyes with Early and Intermediate Age-Related Macular Degeneration." International Journal of Environmental Research and Public Health 17, no. 17 (September 2, 2020): 6379. http://dx.doi.org/10.3390/ijerph17176379.

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In early and intermediate age related macular degeneration (ARMD), visual acuity alone has failed to explain the complete variation of vision. The aim of the present study was to determine correlation between different visual functions and retinal morphology in eyes with early and intermediate ARMD. In this single center cross sectional study, patients diagnosed as early or intermediate ARMD in at least one eye were recruited. Visual functions measured were best- corrected distance visual acuity (DVA), near vision acuity (NVA), reading speed (RS), and contrast sensitivity (CS). Parameters such as thickness (RT) and volume (RV) of the retina, outer retinal layer thickness (ORLT) and volume (ORLV), outer nuclear layer thickness (ONLT) and volume (ONLV), retinal pigment epithelium layer-Bruch’s membrane complex thickness (RPET) and volume (RPEV) were assessed employing semi-auto segmentation method of Spectralis optical coherence tomography (OCT). Twenty-six eyes were evaluated. DVA, CS, and RS showed significantly good correlation with RPET, ONLT, and ONLV, whereas NVA showed good correlation with ONLV and RPET. The present study concluded that RS, CS, NVA, and DVA represent the morphological alteration in early stages and should be tested in clinical settings. ONLT, ONLV, and RPET morphological parameters can be employed as important biomarkers in diagnosis of early to intermediate ARMD.
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Wu, Zhi Hao, Li Li Li, Shuai Shuai Jiang, Ze Xu Hu, Yu Chen Mao, and Mei Fang Zhu. "Preparation and Properties of Recycled-Polyester Nanocomposite Fibers Synergistic Modified with Phosphorus Containing Flame-Retardant and α-Zirconium Phosphate." Materials Science Forum 789 (April 2014): 174–77. http://dx.doi.org/10.4028/www.scientific.net/msf.789.174.

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Recycled-polyester (RPET) was melt blended with the phosphorus-containing flame retardant (FRP) and α-zirconium phosphate (α-ZrP). The thermal properties of RPET/FRP/α-ZrP composites were analyzed. Modified RPET fibers were prepared through melt spinning of dried RPET nanocomposite chips. The mechanical properties and fire-retardant properties of RPET/FRP/α-ZrP fibers containing different α-ZrP contents were tested. The results show that the synergism of α-ZrP and FRP exerts a positive effect on the mechanical and the flame-retardant property of RPET, leading to nanocomposite fibers of 1.9cN/dtex and 31.6% limiting oxygen index (LOI) value.
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Loaeza, David, Jonathan Cailloux, Orlando Santana Pérez, Miguel Sánchez-Soto, and Maria Maspoch. "Impact of Titanium Dioxide in the Mechanical Recycling of Post-Consumer Polyethylene Terephthalate Bottle Waste: Tensile and Fracture Behavior." Polymers 13, no. 2 (January 19, 2021): 310. http://dx.doi.org/10.3390/polym13020310.

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This work provides an experimental analysis regarding the fracture behavior of recycled opaque PET (rPET-O) containing titanium dioxide (TiO2) under plane stress conditions. For this purpose, a commercially post-consumer transparent colored/opaque PET flakes mix was processed using a semi-industrial extrusion calendering process. The manufactured rPET-O sheets had a TiO2 content of 1.45 wt.%. The mechanical and fracture properties of unaged and physically aged (1 year) samples were determined through uniaxial tensile experiments and the Essential Work of Fracture (EWF) methodology, respectively, and were compared to those of recycled transparent PET (rPET-T). Under tensile loading, independently of the aging time, rPET-O samples exhibited similar mechanical behavior as rPET-T up to the yield point. The main differences remained in the post-yielding region. The presence of TiO2 particles allowed reducing the strain energy density up to neck formation in aged samples. Regarding the EWF analysis, it is argued that the energy consumed up to the onset of crack propagation (we) for rPET-T was mainly dependent of the molecular mobility. That is, the we value decreased by 26% when rPET-T was physically aged. Interestingly, we values remained independent of the aging time for rPET-O. In fact, it was highlighted that before crack propagation, the EWF response was principally governed by matrix cavitation ahead of the crack tip, which allowed a significant release of the triaxial stress state independently of the molecular mobility. This property enabled rPET-O to exhibit a resistance to crack initiation 17% higher as compared to rPET-T when the material was physically aged. Finally, independently of the aging time, rPET-O exhibited a resistance to crack growth approximately 21% larger than rPET-T due to matrix fibrillation in large scale deformation.
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Taghavi, Sayed Kamal, Hamzeh Shahrajabian, and Hamid Mohammad Hosseini. "Detailed comparison of compatibilizers MAPE and SEBS-g-MA on the mechanical/thermal properties, and morphology in ternary blend of recycled PET/HDPE/MAPE and recycled PET/HDPE/SEBS-g-MA." Journal of Elastomers & Plastics 50, no. 1 (March 16, 2017): 13–35. http://dx.doi.org/10.1177/0095244317698738.

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In this study, for recycling polyethylene terephthalate, a blend of recycled polyethylene terephthalate (RPET) and high-density polyethylene (HDPE) with maleic anhydride polyethylene (MAPE) and maleic anhydride-grafted styrene–ethylene/butylene–styrene (SEBS-g-MA) were used. The effect of compatibilizers in RPET was investigated by mechanical test (tensile and flexural tests), thermal test (differential scanning calorimetry (DSC)), and melt flow index test. The morphology of fracture surface of samples was investigated by scanning electron microscopy (SEM). The mechanical tests showed that elongation at break point and the fracture energy of samples with composition of RPET (70 wt%)/HDPE (15 wt%)/MAPE (15 wt%) and RPET (75 wt%)/HDPE (10 wt%)/SEBS-g-MA (15 wt%) increased significantly. Results of DSC test and SEM photography showed that ternary blend of RPET/HDPE/MAPE has better compatibility compared with RPET/HDPE/SEBS-g-MA. SEM images showed that MAPE provides better bonding between RPET and HDPE compared with SEBS-g-MA. MAPE was dispersed in RPET better than SEBS-g-MA.
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Khan, Zahid Iqbal, Zurina Binti Mohamad, Abdul Razak Bin Rahmat, Unsia Habib, and Nur Amira Sahirah Binti Abdullah. "A novel recycled polyethylene terephthalate/polyamide 11 (rPET/PA11) thermoplastic blend." Progress in Rubber, Plastics and Recycling Technology 37, no. 3 (March 15, 2021): 233–44. http://dx.doi.org/10.1177/14777606211001074.

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This work explores a novel blend of recycled polyethylene terephthalate/polyamide 11 (rPET/PA11). The blend of rPET/PA11 was introduced to enhance the mechanical properties of rPET at various ratios. The work’s main advantage was to utilize rPET in thermoplastic form for various applications. Three different ratios, i.e. 10, 20 and 30 wt.% of PA11 blend samples, were prepared using a twin-screw extruder and injection moulding machine. The mechanical properties were examined in terms of tensile, flexural and impact strength. The tensile strength of rPET was improved more than 50%, while the increase in tensile strain was observed 42.5% with the addition of 20 wt.% of PA11. The improved properties of the blend were also confirmed by the flexural strength of the blends. The flexural strength was increased from 27.9 MPa to 48 MPa with the addition of 30 wt.% PA11. The flexural strain of rPET was found to be 1.1%. However, with the addition of 10, 20 and 30 wt.% of PA11, the flexural strain was noticed as 1.7, 2.1, and 3.9% respectively. The impact strength of rPET/PA11 at 20 wt.% PA11 was upsurged from 110.53 to 147.12 J/m. Scanning electron microscopy analysis revealed a dispersed PA11 domain in a continuous rPET matrix morphology of the blends. This work practical implication would lead to utilization of rPET in automobile, packaging, and various industries.
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Negoro, Takanori, Rutchaneekorn Wongpajan, Wiranphat Thodsaratpreeyakul, Jitlada Boonlertsamut, Supaphorn Thumsorn, Hiroyuki Inoya, and Hiroyuki Hamada. "Optimizing of vented injection molding on mechanical performance and miscibility of recycled poly(ethylene terephthalate) and polycarbonate blends." Journal of Polymer Engineering 37, no. 3 (March 1, 2017): 271–77. http://dx.doi.org/10.1515/polyeng-2016-0034.

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Abstract Blending of recycled poly(ethylene terephthalate) (RPET) and polycarbonate (PC) was performed by melt compounding. The blends were subsequently fabricated to dumbbell specimens by vented injection molding. The mechanical properties, thermal characteristic and morphology of RPET/PC blends were investigated as a function of PC contents. Vented injection molding presented an advantage for superior mechanical properties of RPET/PC blends. The addition of PC enhanced impact strength and fracture toughness with remaining tensile properties. The glass transition temperatures of PET and PC shifted toward each other, which indicated their partial miscibility of RPET and PC in the blends. The toughness mechanism of RPET and PC was related to core-shell structure and good interfacial adhesion at higher contents of PC.
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Pinter, Elisabeth, Frank Welle, Elisa Mayrhofer, Andreas Pechhacker, Lukas Motloch, Vera Lahme, Andy Grant, and Manfred Tacker. "Circularity Study on PET Bottle-To-Bottle Recycling." Sustainability 13, no. 13 (July 1, 2021): 7370. http://dx.doi.org/10.3390/su13137370.

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With the European Green Deal, the importance of recycled products and materials has increased. Specifically, for PET bottles, a high content of recycled material (rPET) is demanded by the industry and consumers. This study was carried out in a lab environment replicating real-life industrial processes, to investigate the possible impacts on rPET quality over eleven recycling loops, aiming to use high amounts of rPET repetitively. A cycle included extrusion, solid state polycondensation (SSP), a second extrusion to simulate bottle production, hot wash and a drying step. 75% rPET and 25% virgin PET were extruded in eleven cycles to simulate a recycling and production process. Samples underwent chemical, physical and biological analysis. The quality of the rPET material was not adversely affected. Parameters such as coloring, intrinsic viscosity, concentration of critical chemicals and presence of mutagenic contaminants could be positively assessed. The quality of the produced material was likely influenced by the input material’s high standard. A closed loop PET bottle recycling process using an rPET content of up to 75% was possible when following the proposed process, indicating that this level of recycled content can be maintained indefinitely without compromising quality.
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Dominici, Franco, Fabrizio Sarasini, Francesca Luzi, Luigi Torre, and Debora Puglia. "Thermomechanical and Morphological Properties of Poly(ethylene terephthalate)/Anhydrous Calcium Terephthalate Nanocomposites." Polymers 12, no. 2 (January 30, 2020): 276. http://dx.doi.org/10.3390/polym12020276.

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Calcium terephthalate anhydrous salts (CATAS), synthetized by reaction of terephthalic acid with metal (Ca) oxide were incorporated at different weight contents (0–30 wt. %) in recycled Poly(ethylene terephthalate) (rPET) by melt processing. Their structure, morphology, thermal and mechanical properties (tensile and flexural behavior) were investigated. Results of tensile strength of the different formulations showed that when the CATAS content increased from 0.1 to 0.4 wt. %, tangible changes were observed (variation of tensile strength from 65.5 to 69.4 MPa, increasing value for E from 2887 up to 3131 MPa, respectively for neat rPET and rPET_0.4CATAS). A threshold weight amount (0.4 wt. %) of CATAS was also found, by formation at low loading, of a rigid amorphous fraction at the rPET/CATAS interface, due to the aromatic interactions (π−π conjugation) between the matrix and the filler. Above the threshold, a restriction of rPET/CATAS molecular chains mobility was detected, due to the formation of hybrid mechanical percolation networks. Additionally, enhanced thermal stability of CATAS filled rPET was registered at high content (Tmax shift from 426 to 441 °C, respectively, for rPET and rPET_30CATAS), essentially due to chemical compatibility between terephthalate salts and polymer molecules, rich in stable aromatic rings. The singularity of a cold crystallization event, identified at the same loading level, confirmed the presence of an equilibrium state between nucleation and blocking effect of amorphous phase, basically related to the characteristic common terephthalate structure of synthetized Ca–Metal Organic Framework and the rPET matrix.
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Salleh, Mohd Nazry, Ruey Shan Chen, Mohd Hafizuddin Ab Ghani, Farizul Hafiz Kasim, and Ahmad Sahrim. "Preparation and Characterization of High-Density Polyethylene Blends and Recycled Poly(ethylene terephthalate)." Applied Mechanics and Materials 695 (November 2014): 131–34. http://dx.doi.org/10.4028/www.scientific.net/amm.695.131.

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Polymer blends based on recycled high density polyethylene (rHDPE) and recycled poly (ethylene terephthalate) (rPET) with two types of ethylene-glycidyl methacrylate copolymer (E-GMA), Lotader AX8840 and Lotader AX8900 as compatibilizer were produced in a co-rotating twin screw extruder. The effects of adding rPET content on the impact properties of rHDPE-rich blends were also investigated. The result showed an enhancement of about 80-270% in impact properties as compared to those of the Lotader AX8900. The impact strength also showed a decreasing trend as the rPET content was increased. The addition of E-GMA to the rHDPE/rPET blends was found to recover the blend toughness as well as improving the compatibility between HDPE and PET. In this study, the highest result was obtained for the rHDPE/rPET blends using Lotader AX8840 composition with 7.5% E-GMA content. FTIR analysis of the compatibilized blends confirmed the chemical interaction and improved interfacial bonding between the two phases.
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Dissertations / Theses on the topic "RPET"

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Kegel, Mark Steven, and n/a. "Fibres from recycled post consumer PET/nylon 6 blends." Swinburne University of Technology, 2006. http://adt.lib.swin.edu.au./public/adt-VSWT20070606.111448.

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The objective of this project was to develop blends based upon post consumer RPET and N6, and to evaluate the suitability of these blends to form fibres for the end use in carpet fibre. In the work carried out it was found it is possible to spin RPET/N6 biconstituent fibres over a wide range of blend ratios. All the blends studied have diminished physical properties when compared to those of pure RPET and N6. The processability of these blends also deteriorated due to the large increases in normal forces which manifests in extrusion equipment as die swell that often results in melt fracture. It has been shown that the morphology of the fibre controls the degree of decay in properties and die swell at the spinnerette. The blends that are rich in one phase, with the secondary phase distributed as elongated fibrils have shown better physical performance and improved processing compared to the blends 70/30 � 30/70, which have poorer properties and increased die swell due to there co-continuous morphology. In quiescent studies, the physical properties of the blends have had little deviation from those predicted using a rule of mixtures line. In and around the 50% RPET blend, die swell was observed to be extreme and this makes fibre spinning difficult. It was found that this was caused by a loss in viscosity in the blends and a general increase in normal forces in response to applied shear. The die swell phenomenon is a rheological characteristic of the blends, which was inevitably caused by internal capillary flow of one component in the other. IR spectroscopy has shown that there is little to no in-situ compatibilisation occurring during simple melt processing. However, it was found that significant interfacial compatibilisation could be achieved through solid stating N6/RPET blends. The FTIR spectra for solid state blends in figure 4.51 has shown absorbency in the 3300 cm-1 region after all free N6 was removed. This indicates that in-situ compatibilisation has occurred between the phases in the solid stating process and it is a time dependent reaction. The Burgers and Koltunov models can be used to predict the creep behaviour of the fibre blends studied. The Burgers model provides greater accuracy for longer-term exposure to stress. From the thermal results, the solid stating process significantly affects the melting and crystallisation out of the melt and the ultimate level of crystallinity. The contribution of the copolymer in these changes appears to be small. The physical strength of the fibres made on the laboratory line was only marginally lower than those made on a factory line. The morphology of the mid-range blends is co-continuous and that of the N6 and RPET rich blends is dispersed droplet morphology. Based on the finding, a N6 rich blends and in particular the 10% RPET blend is the most suitable for further commercial development as its processing, physical performance and post spinning processing closely resemble the pure N6 currently in use. It has provided performance and consistency throughout the processing and testing we have conducted.
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López, Cartagena Clara Lucy, Verastegui Franz Ricardo Jäeger, and Carranza Karina Ramírez. "Plan para mejorar el abastecimiento de materia prima reciclada en empresa productora de RPET." Master's thesis, Universidad del Pacífico, 2019. http://hdl.handle.net/11354/2361.

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La Unidad de negocio de reciclado pertenece a una empresa que se desarrolla en el sector económico del plástico como proveedor líder en la fabricación de envases rígidos en la región andina, Centroamérica y el Caribe. De modo que la presente tesis tiene el objetivo de mejorar el abastecimiento de la Unidad de negocio de reciclado de la principal productora de envases PET y resina reciclada del país. Con este propósito, se debe considerar que una de sus dos líneas de producción utiliza el 40% de su capacidad instalada teórica debido a la falta de materia prima (botella post-consumo reciclada). Esta información se conoce a través de un diagnóstico de su cadena de suministro que utiliza la metodología del Mapa estratégico funcional, que identifica la implementación de centros de acopio como la actividad que mejor se alinea con la estrategia general de la empresa para diversificar las fuentes de abastecimiento. Actualmente, la unidad de reciclado cuenta con un centro de acopio en Ica que ha contribuido con los volúmenes de compra. En ese sentido, se propone la implementación de un segundo centro de acopio en Trujillo que diversifique las fuentes de suministro. Para determinar la ubicación del mismo, se utilizó el modelo de centro de gravedad (Chopra y Meindl 2013), que permitió localizar el punto que minimiza el costo de transporte e incrementa la cantidad de acopio. Posterior a ello, se realizó el análisis cuantitativo y cualitativo que permitió establecer la ciudad que representa la mejor alternativa para la ubicación del centro de acopio, así como su capacidad instalada según el estudio de factor poblacional.
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Lycke, Sara, Lisa Rosell, and Emma Landström. "Bidrar kunskap till hållbara köpintentioner? : En kvantitativ studie om vad som påverar konsumenters köpintentioner till rPET." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-26356.

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Textilindustrin är den mest förorenande industrin efter oljeindustrin och ett mål är därför att arbeta med mer återvunna fibrer. Dock väljs ofta dessa alternativ bort av konsumenter även fast en viss efterfrågan har identifierats. Trots en ökad efterfrågan kopplat till hållbara val så besitter inte konsumenter kunskap kring miljöfrågor kopplade till de hållbara alternativen. Avsaknad av kunskap kan alltså vara en orsak till varför deras åsikter inte återspeglas i konsumtionsvalet, därmed uppstår frågan om det finns ett samband mellan kunskap och köpintentioner, eller vilka variabler som påverkar köpintentioner. Polyester är ett material som är mycket påfrestande för miljön och fortsätter vara populärt att använda. Detta har lett till föroreningar, ett avsevärt ökat utsläpp samt stora mängder PET-avfall till miljön. Produktionen av återvunnen polyester, rPET, är mer miljövänlig än produktion av nyproducerad polyester. Exempelvis, för varje kilo mekanisk återvunnen polyester minskar utsläpp av växthusgaser med 70% jämfört med växthusgasutsläpp orsakade av nyproducerad polyester. Då tidigare studier som använt sig av en omarbetad version av teorin Theory of Planned Behavior har visat att attityder, subjektiva normer, upplevd beteendekontroll samt kunskap påverkar intentioner testar denna studie om så även är fallet när de kommer till köpintentioner till rPET. Genom en kvantitativ enkätundersökning och med hjälp av en omarbetad version av teorin Theory of Planned Behavior undersöks om det finns ett samband mellan modellens variabler och köpintentioner till rPET. Resultatet visar att attityder och upplevd beteendekontroll har ett starkt samband med köpintentioner till rPET samt att det finns ett samband, dock negativt och svagare, mellan objektiv kunskap och köpintentioner till rPET. De andra variablerna, subjektiva normer och subjektiv kunskap, besitter inte ett signifikant samband med köpintentioner till rPET. Fortsättningsvis skiljde sig sambanden för variablerna mellan män och kvinnor.
The textile industry is the most polluting industry after the oil industry. Therefore, a goal is to work with more recycled fibers within the textile industry. However, these alternatives are often opted out by consumers despite the fact that a demand has been identified on the market. Previous studies have shown that even though the increased demand is associated with sustainable choices, consumers do not possess knowledge about the environmental issues related to sustainable alternatives. Lack of knowledge can be a reason for why consumers' opinions do not reflect on their consumption choices, hence the question arises whether there is a connection between knowledge and purchase intentions, or which variables do affect the purchase intention. Polyester has a negative impact on the environment but remains popular to use. This has led to pollution, significant increase of emissions, and large amounts of PET waste. The production of recycled polyester, rPET, is however more environmentally friendly than the one of newly produced polyester. For instance, for every kilogram of mechanically recycled polyester, the greenhouse gas emissions are reduced by 70% compared to the greenhouse gas emissions caused by newly produced polyester. By using the revised model Theory of Planned Behavior, previous studies have shown that attitudes, subjective norms, perceived behavioral control and knowledge affects intentions. Thus, this study aims to test whether this is the case or not when it comes to purchasing intention for rPET. By using a quantitative survey and a revised version of the model Theory of Planned Behavior, the revised model explores whether there is a relation between these variables and purchasing intentions towards rPET. The results show that attitudes and perceived behavioral control have a strong relation with purchasing intentions to rPET. Moreover, there is a relation, although negative and weaker, between objective knowledge and purchasing intentions to rPET. However the other variables, subjective norms and subjective knowledge, do not have a significant relation with purchasing intentions to rPET. Furthermore, the relation between the variables differ between the genders.
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Whitt, Michael John-Ross. "Studies to Characterize Heavy Metal Content and Migration From Recycled PolyethyleneTerephthalate." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1350.

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Packaging Materials account for 31% of the world’s municipal solid waste. Agencies like the Environmental Protection Agency (EPA) and the Agency for Toxic Substances and Disease Registry (ATSDR) are pushing for the increased use of recycled thermoplastic materials. Polyethylene terephthalate (PET) is a commonly recycled thermoplastic which is used to package ready-to-eat fruits and vegetables. Most recycled polyethylene terephthalate (RPET) packaging materials contain heavy metal catalysts, the most common being antimony. The recent increased use of recycled plastic materials has been suspected as the source of increased human heavy metal exposure. In this study, cadmium, chromium, nickel, lead and antimony were quantified in post-consumer RPET rigid containers and films using inductively coupled plasma-atomic emission spectrometry (ICP-AES). Two hundred samples were tested of which 29 were found to be contaminated with heavy metals in the parts-per-million (ppm) range. Chromium was found in all the contaminated sample replicates at an average level of 8.18 ppm. Cadmium was found in all the contaminated samples as well. Lead was found in 90.4% of the contaminated samples and concentrations ranged from a low of 0.02 ppm to a high of 0.36 ppm. Nickel was found in 96.4% of the contaminated samples while antimony was found in 97.6% of the samples. Due to limited sample material, 22 of the 29 contaminated RPET rigid containers and films were tested for heavy metal migration into a 5% citric acid:water solution (w/v) or deionized water. Samples were subjected to prolonged storage at 7.2 or 22.2°C for 1, 7 or 14 days, or were exposed for 5 minutes to microwaves from a 1700-watt microwave oven set to 70% power before analysis. Leachate values were at ppb levels but were often below the ICP-AES Limits of Detection which were at also the ppb level, whether calculated for deionized water or 5% citric acid in water. No measureable levels of heavy metal were detected for any sample exposed to water, regardless of treatment. For samples exposed to 5% citrate and stored or microwaved, only chromium and nickel leached at measurable levels, and the number of RPET’s releasing measurable chromium and nickel increased with microwaving compared to the same plastics stored at 22.2 or 7.2°C. Since leaching was calculated as µg/L of heavy metal lost from the entire inner surface (1021 cm2) of a retail salad bag, actual exposure to heavy metal would be much less than measured in this study as retail fruit and vegetable packages and microwaveable pouches usually contain very little liquid in order to increase food safety. The results therefore suggest the potential for little migration of heavy metal from recycled PET to whole or fresh-cut fruits and vegetables when held at ambient or refrigerated temperatures, or when microwaved.
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Lightfoot, Ruth M. "Retinal pigment epithelial dystrophy (RPED) in the dog." Thesis, Royal Veterinary College (University of London), 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339266.

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Wiezlak, M. K. "Regulation and function of the RPEL protein - Phactr1." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1394439/.

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Actin-binding proteins play well established roles in the regulation of actin dynamics and assembly of F-actin based structures involved in cell motility and adhesion. The Phosphatase and actin regulator (Phactr) family of proteins each contain four G-actin binding RPEL motifs and has been found to bind protein phosphatase 1 (PP1) via their C-terminal domain. Their function is not well established and it has been unclear whether G-actin can be their regulator. Members of the Phactr family are highly expressed in the nervous system and in some metastatic cancers. The RPEL domain was previously shown to confer Rho-regulated nuclear shuttling and activation of Serum Response Factor (SRF) coactivator myocardin – related transcription factor A (MRTF-A, also known as MAL/MKL1). MRTF-A is cytoplasmic in unstimulated cells and accumulates in the nucleus upon activation of Rho-actin signalling. In this thesis I show that activation of Rho-actin signalling by serum stimulation induces nuclear accumulation of Phactr1, but not other Phactr family members (Phactr2-4). Actin binding by the three Phactr1 C-terminal RPEL motifs is required for Phactr1 cytoplasmic localisation in resting cells. Phactr1 nuclear accumulation is Importin α−β-dependent. I also reveal that G-actin and Importin α−β bind competitively to nuclear import signals associated with the N- and C-terminal RPEL motifs in Phactr1. All four motifs are required for the inhibition of serum-induced Phactr1 nuclear accumulation by elevated G-actin. G-actin and PP1 bind competitively to the Phactr1 C-terminal region, and expression of Phactr1 C-terminal RPEL mutants that cannot bind G-actin induces actomyosin foci dependent on PP1 binding. In CHL-1 metastatic melanoma cells, Phactr1 exhibits actin-regulated subcellular localisation and is required for stress fibre assembly, motility, and invasiveness. These data support a role for Phactr1 in actomyosin assembly and suggest that Phactr1 G-actin sensing allows its coordination with F-actin availability.
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Niang, Awa. "RPE et relaxation de composites moléculaires bidimensionnels." Toulouse 3, 1994. http://www.theses.fr/1994TOU30153.

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Nous avons etudie par resonance paramagnetique electronique en bande x l'anisotropie de la largeur de raie et du facteur g des composites moleculaires bidimensionnels de type perovskite feuillete nh#3-r-nh#3mx#4. Les mesures ont ete effectuees sur des monocristaux et des poudres en fonction de la temperature (de 4. 2 a 290k). Le temps de relaxation spin-reseau t#1 a egalement ete mesure par la methode de modulation en fonction de la temperature. Les echantillons presentent des structures et des interactions de couplage differentes suivant la nature de l'halogene x, du metal m et du radical organique r. Nous avons analyse l'influence de ces parametres sur le comportement des spins par l'etude des echantillons nh#3-(ch#2)#n-nh#3mx#4 m = (manganese, cuivre. ), x (chlore, brome) et n = 2,3,4,5. Lorsque r est compose de molecules ayant des liaisons insaturees ces materiaux constituent d'excellentes matrices pour des reactions de polymerisation selectives par irradiation ou par traitement thermique. Nous avons effectue des mesures de rpe et de relaxation spin-reseau sur le complexe de propargylamine et de chlorure de cadmium hcc-ch#2-nh#3#2cdcl#4 chauffe. L'interpretation des resultats s'effectue en tenant compte de la forte interaction d'echange presente dans ces echantillons et des differentes interactions de couplage. Les dependances de t#1 sont interpretees en utilisant le modele des trois reservoirs de bloembergen et wang. Les resultats mettent en evidence la diffusion des spins lorsque le metal est le manganese et la presence d'une interaction d'echange antisymetrique modulee par les phonons dans le cas du cuivre. La nature de l'halogene joue egalement un role important dans la dynamique des spins et notamment dans la relaxation spin-reseau. Les resultats obtenus sur hcc-ch#2-nh#3#2cdcl#4 chauffe sous vide mettent en evidence la creation d'un nombre important de centres paramagnetiques due a la disparition des triples liaisons et par consequent une forte interaction d'echange
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Chandler, Aglaia. "The role of RpoT;3 in chloroplast development and gene expression." Thesis, [College Station, Tex. : Texas A&M University, 2005. http://hdl.handle.net/1969.1/ETD-TAMU-1701.

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Stranna, Andrea. "Testing of RPT in pumping mode of operation." Thesis, Norges Teknisk-Naturvitenskaplige Universitet, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20656.

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In this project two pump mode tests has been carried out on a model RPT in the Waterpower Laboratory at NTNU. The measurement set up and execution of the tests were the same, except for the method of dissipating energy in the system. In the first test one of the feed pumps in the basement was used as energy dissipator. In the second test a throttle valve was used as energy dissipator.The objective has been to see how the Waterpower Laboratory is suited for such a test. It was also important to test the two different dissipation methods and evaluate which should be preferred when performing a pump mode test.During the tests it was observed that the guide vane angle kept changing. When the results were processed it became evident that the variations in guide vane angle during the tests had a big influence on the measured pump curves. Variations in guide vane angle has not previously been observed during turbine mode testing. It is presumed that the variation in guide vane angles is due to play in the guide vane system and the design of the guide vanes. The guide vanes are Francis vanes, and not RPT vanes. It is assumed that it is the sharp trailing edge of the guide vanes that causes turbulence over the vanes in pump mode, thus making the guide vanes move about within the play of the guide vane system. It is suggested that the guide vane system is replaced with an RPT guide vane system for further testing in pump mode.The two dissipation methods tested were both effective. The throttle valve works best for achieving 0 flow, while the feed pump is easier to regulate. None of the methods showed signs of high noise or vibrations, and both may be used for future tests.
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Stein, Roberto de Mello. "RPE em compostos de grafite intercalado com ALCL3." [s.n.], 1985. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277549.

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Orientador: Carlos Rettori
Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
Made available in DSpace on 2018-07-17T18:45:29Z (GMT). No. of bitstreams: 1 Stein_RobertodeMello_D.pdf: 1782261 bytes, checksum: 2b8b269480527ef2e84e41f76f4d4aa4 (MD5) Previous issue date: 1985
Resumo: Nós mostramos que no Composto de Grafite Intercalado com AlCl3, tipo aceitador, a dependência com a temperatura da resistividade no plano e na direção do eixo-c entre 100K e 300K, pode ser obtida experimentalmente através da análise da intensidade e da forma da linha da ressonância de spin dos portadores de carga. Os resultados indicam um comportamento metálico e do tipo salto por ativação térmica para o transporte de carga no plano e no eixo-c, respectivamente. A análise da ressonância no grafite puro apresenta dentro do erro experimental, a dependência com a temperatura esperada para a resistividade no plano e no eixo-c e uma susceptibilidade que independe da temperatura. A dependência da largura da linha é atribuída a dependência com a temperatura da mobilidade dos portadores e da razão entre a probabilidade de transição para "spin-flip" devido ao acoplamento spin-órbita e o espalhamento coulombiano. Para estágios um e sete os parâmetros da ressonância revelam uma transição de fase a 210K e 168K respectivamente
Abstract: We show that the temperature dependence of the in-plane and c-axis resitivities between 100K and 300K for the acceptor AlCl3 - Graphite Intercalated Compounds can be obtained from the analysis of the intensity and lineshape of the resonance in a conduction carrier spin resonance experiment. The results suggest a metallic and thermal activated hopping like character for the in-plane and c-axis charge transport respectively. The analysis of the resonance for pure graphite gives, within the experimental accuracy, the expected temperature dependence for the in-plane and c-axis resistivities, and an almost temperature independent Pauli paramagnetic susceptibility. The temperature dependence of the linewidth is attributed to the dependence of both the carrier s mobility and the ratio between the transition probability for spin-flip due to spin-orbit coupling and the coulomb scattering. For stage one and seven the resonance parameters reveal a phase transition at 210K and 168K respectively
Doutorado
Física
Doutor em Ciências
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Books on the topic "RPET"

1

Richard, Thornton. Malaysia the RPGT handbook. Kuala Lumpur: Commerce Clearing House (Malaysia) Sdn. Bhd., 2014.

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Mead, George Robert Stow. Die Lehre vom feinstofflichen Ko rper in der westlichen Tradition: Geistko rper, Strahlenko rper und Auferstehungsko rper in der Erfahrungswelt der Pythagora er, Neuplatoniker, Gnostiker und Hermetischen Philosophen. Interlaken: Ansata-Verlag, 1991.

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Kurt, Meyberg, ed. Algebra: Gruppen - Ringe - Ko rper. Heidelberg: Spektrum, 2009.

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Kurt, Meyberg, ed. Algebra: Gruppen - Ringe - Ko rper. 2nd ed. Heidelberg: Spektrum, Akad. Verl., 2010.

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Limited, Dorling Kindersley. Kennst du das?: Dein Ko rper. Mannheim: Duden, 2006.

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Grethlein, Thomas. Heilfasten: Einklang von Ko rper und Seele. Augsburg: Pattloch, 1995.

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Export, Valie. Das Reale und sein Double: Der Ko rper. Bern: Benteli Verlag, 1992.

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Der Fisch in uns: Eine Reise durch die 3,5 Milliarden Jahre alte Geschichte unseres Ko rpers. 3rd ed. Frankfurt am Main: <> Fischer, 2010.

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Thielen, Michael. Blasformen von Kunststoffhohlkörpern. München [u.a.]: Hanser, 2006.

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Villa, Paula-Irene. Sexy Bodies: Eine soziologische Reise durch den Geschlechtsko rper. 3rd ed. Wiesbaden: VS, Verl. fu r Sozialwissenschaften, 2006.

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Book chapters on the topic "RPET"

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Martemyanov, Kirill A., Pooja Parameswaran, Irene Aligianis, Mark Handley, Marga Gual-Soler, Tomohiko Taguchi, Jennifer L. Stow, et al. "RPT." In Encyclopedia of Signaling Molecules, 1694–99. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0461-4_65.

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Maupin-Furlow, Julie A., and Hugo V. Miranda. "RPT." In Encyclopedia of Signaling Molecules, 4756–62. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-67199-4_65.

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Fadell, Edward R., and Sufian Y. Husseini. "RPT-Constructions." In Springer Monographs in Mathematics, 187–206. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56446-8_12.

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Dithmar, Stefan, and Nil Celik. "RPE Autofluorescence." In Retinal Pigment Epithelium in Health and Disease, 233–45. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-28384-1_13.

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Müller, Claudia, and Silvia C. Finnemann. "RPE Phagocytosis." In Retinal Pigment Epithelium in Health and Disease, 47–63. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-28384-1_3.

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von der Burchard, Claus, and Johann Roider. "RPE and Laser." In Retinal Pigment Epithelium in Health and Disease, 281–92. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-28384-1_16.

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Finnemann, Silvia C., and Yongen Chang. "Photoreceptor—RPE Interactions." In Visual Transduction and Non-Visual Light Perception, 67–86. Totowa, NJ: Humana Press, 2008. http://dx.doi.org/10.1007/978-1-59745-374-5_4.

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Yoshida, Takeshi, and Kyoko Ohno-Matsui. "Interaction Between Photoreceptors and RPEs." In Neuroprotection and Neuroregeneration for Retinal Diseases, 255–71. Tokyo: Springer Japan, 2014. http://dx.doi.org/10.1007/978-4-431-54965-9_18.

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Martemyanov, Kirill A., Pooja Parameswaran, Irene Aligianis, Mark Handley, Marga Gual-Soler, Tomohiko Taguchi, Jennifer L. Stow, et al. "Rpt, Regulatory particle triple-A (Rpt) Subunits of 26S Proteasomes." In Encyclopedia of Signaling Molecules, 1699. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0461-4_101207.

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Szalai, Eszter, John M. Nickerson, and Hans E. Grossniklaus. "RPE Histopathology and Morphometry." In Retinal Pigment Epithelium in Health and Disease, 3–17. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-28384-1_1.

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Conference papers on the topic "RPET"

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Beharry, Nikolai, and Boppana Chowdary. "INVESTIGATING THE EFFECTS OF PROCESS PARAMETERS ON THE FLEXURAL STRENGTH OF 3D PRINTED PLASTICS." In International Conference on Emerging Trends in Engineering & Technology (IConETech-2020). Faculty of Engineering, The University of the West Indies, St. Augustine, 2020. http://dx.doi.org/10.47412/fbto9600.

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In this paper, the flexural strength of 90% Recycled Polyethylene Terephthalate (RPET), Polyethylene Terephthalate Glycol (PETG) and Polycarbonate (PC), are investigated with varying layer thickness, infill percentage and raster angle. Across each material, higher infill percentage resulted in higher flexural strength when loaded, whereas raster angle was the least significant. Using a Genetic Algorithm, the maximum flexural strength of each material was determined to be 48.57 MPa for RPET, 44.22 MPa for PETG and 101.54 MPa for the PC samples. Using these results, practical applications in local industries were investigated. The relatively high flexural strength of the RPET indicates great progress in material science towards creating a strong and sustainable 3D Printing filament. However, a cost-benefit analysis performed on the existing market value indicated that in its current state, the price per strength of RPET is heavily outmatched by PETG as a cheaper option and PC as a stronger option. If the process of creating filament from recycled plastics is refined, RPET filament will become cheaper and more desirable for manufacturing. This can lead to diversifying the local economy as a competitive and eco-friendly option to satisfy consumer needs.
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Zakiah, Z. T. Nurul, A. R. Azrin Hani, and M. Reshevarmen. "Puncture impact performance of rPET/Kevlar hybrid laminated composite." In PROCEEDINGS OF 8TH INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS ENGINEERING & TECHNOLOGY (ICAMET 2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0052723.

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Canadas, Mario, Miguel Embid, Eduardo Lage, Manuel Desco, Juan Jose Vaquero, and Jose Manuel Perez. "Performance comparison of two commercial small animal PET scanners: ClearPETT and rPET-1T." In 2008 IEEE Nuclear Science Symposium and Medical Imaging conference (2008 NSS/MIC). IEEE, 2008. http://dx.doi.org/10.1109/nssmic.2008.4774310.

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Owen, M. M., U. S. Ishiaku, A. Danladi, B. M. Dauda, and A. Z. Romli. "Mechanical properties of epoxy-coated sodium hydroxide and silane treated kenaf/recycled polyethylene tereph-thalate (RPET) composites: Effect of chemical treatment." In DISRUPTIVE INNOVATION IN MECHANICAL ENGINEERING FOR INDUSTRY COMPETITIVENESS: Proceedings of the 3rd International Conference on Mechanical Engineering (ICOME 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5047159.

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Owen, M. M., U. S. Ishiaku, A. Danladi, B. M. Dauda, and A. Z. Romli. "The effect of surface coating and fibre loading on thermo-mechanical properties of recycled polyethylene terephthalate (RPET)/epoxy-coated kenaf fibre composites." In DISRUPTIVE INNOVATION IN MECHANICAL ENGINEERING FOR INDUSTRY COMPETITIVENESS: Proceedings of the 3rd International Conference on Mechanical Engineering (ICOME 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5047160.

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Cao, Z., J. Q. Deng, and K. Liu. "Numerical Research of Multi-Scale Coupling Simulation on Rotary Pressure Exchanger and Pipe System." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-48017.

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Rotary Pressure exchanger (RPE) is an efficient device which recovers pressure energy from liquid streams in process industries. In this work, a multi-scale numerical investigation of pressure propagation in RPE and the pipeline is carried out. A system model including pipe system and RPE component is firstly presented, and is then solved by the integration of 1-D Method of characteristics (MOC) and CFD method. The simultaneous data exchange between the pipeline and RPE is enabled by making use of the existing programming interfaces. At last, the mutual effect of wave phenomenon in pipeline and RPE is evaluated by the synchronous interaction under transient operating conditions. The proposed multi-scale coupling approach in this work could either provide the internal flow details in RPE device or the dynamic behavior of the system, making the numerical simulation more reasonable with system-level accuracy and time-saving.
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Ayres, K. R., P. R. Hurrell, C. M. Gill, K. Bridger, L. D. Burling, C. S. Punshon, Liwu Wei, and N. Bagshaw. "Development of Reduced Pressure Electron Beam Welding Process for Thick Section Pressure Vessel Welds." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25957.

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A reduced pressure electron beam (RPEB) process is being developed in the UK by ‘The Welding Institute’ (TWI) for the manufacture of thick section plate, forging and pipe welds. Potential gains include minimal distortion, fewer weld defects and rapid production times, compared to conventional arc welding processes. To date, RPEB welding equipment and parameters have been successfully developed and applied in a sealed chamber under partial vacuum (∼1mbar), to produce 1-pass seam welds in low alloy steel plates and forgings. Rolls-Royce commissioned TWI to produce RPEB welds in SA508 Grade 3 Class 1 steel forgings of between 100mm and 160mm thickness, as part of a feasibility study for nuclear pressure vessel applications. This paper presents results of micro-structural examinations, material property tests and residual stress analyses of RPEB welds in SA508 Grade 3 steel forgings, both in the as-welded condition and after post weld heat treatment (PWHT). This data was required in order to assess the structural integrity of the weldment. A narrow uniform fusion zone approximately 10mm wide and 3mm deep heat affected zone (HAZ) was produced. High hardness levels were measured in the weld HAZ, but the application of PWHT at 600°C had a beneficial tempering effect, reducing the maximum hardness to below 300Hv. A 3D finite element model was used and deep hole-drilling measurements were independently performed, to determine welding residual stress distributions. In both cases yield magnitude tri-axial tensile stresses were evaluated in the centre of the weld and adjacent HAZ, of up to +600MPa. This result is as expected since the centre region is the last to solidify and cool, with a high degree of restraint to weld shrinkage. However effective stress relaxation occurs during PWHT, mainly due to creep, reducing the maximum residual stress to about 100MPa (or 20% yield strength). This feasibility study has shown that RPEB welding is a viable method for fabricating large pressure vessels in low alloy steels. Sound joints can be produced in sections up to 160mm thick in a vacuum chamber. Further development work is being done by TWI in order to apply the technique out-of-chamber using a local vacuum seal.
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Leverette, Steven J., and Bob Wolfram. "API RP2T and RP2FPS: Moving Forward." In Offshore Technology Conference. Offshore Technology Conference, 2008. http://dx.doi.org/10.4043/19603-ms.

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"IEEE RPT conference committee." In 12th IEEE International Conference on Advanced Thermal Processing of Semiconductors. IEEE, 2004. http://dx.doi.org/10.1109/rtp.2004.1441697.

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Day, S. Daniel, Frank M. G. Wong, Steven R. Gordon, Lana L. Wong, and Raul B. Rebak. "Electrochemical Testing of Gas Tungsten Arc Welded and Reduced Pressure Electron Beam Welded Alloy 22." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93730.

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Alloy 22 (N06022) is the material selected for the fabrication of the outer shell of the nuclear waste containers for the Yucca Mountain high-level nuclear waste repository site. A key technical issue in the waste package program has been the integrity of the container weld joints. The currently selected welding process for fabricating and sealing the containers is the traditional gas tungsten arc welding (GTAW) or TIG method. An appealing faster alternative technique is reduced pressure electron beam (RPEB) welding. It was of interest to compare the corrosion properties of specimens prepared using both types of welding techniques. Standard electrochemical tests were carried on GTAW and RPEB welds as well as on base metal (non-welded) to determine their relative corrosion behavior in simulated concentrated water (SCW) at 90°C (alkaline), 1 M HCl at 60°C (acidic) and 1 M NaCl at 90°C (neutral) solutions. Results show that for all practical purposes, the three tested materials had the same electrochemical behavior in the three tested electrolytes.
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Reports on the topic "RPET"

1

Lin, Charles P. Mechanism of Ultrashort Pulse Laser Injury to the RPE (Retinal Pigment Epithelium). Fort Belvoir, VA: Defense Technical Information Center, February 2003. http://dx.doi.org/10.21236/ada417926.

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Kruger, Albert A., Dong-Sang Kim, and John D. Vienna. Preliminary ILAW Formulation Algorithm Description, 24590 LAW RPT-RT-04-0003, Rev. 1. Office of Scientific and Technical Information (OSTI), December 2013. http://dx.doi.org/10.2172/1110191.

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Hu, Ningning, and Peter Steenkiste. RPT: A Low Overhead Single-End Probing Tool for Detecting Network Congestion Positions. Fort Belvoir, VA: Defense Technical Information Center, December 2003. http://dx.doi.org/10.21236/ada461141.

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Lin, Charles P. Study of Short-Pulsed Laser Retinal Injury Mechanisms By Time-Resolved Imaging of Photomechanical Transients in RPE. Fort Belvoir, VA: Defense Technical Information Center, May 2000. http://dx.doi.org/10.21236/ada379774.

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Gupta, Mukesh, Belinda Niemi, and Ingle Paik. RPP-PRT-58489, Revision 1, One Systems Consistent Safety Analysis Methodologies Report. 24590-WTP-RPT-MGT-15-014. Office of Scientific and Technical Information (OSTI), September 2015. http://dx.doi.org/10.2172/1379496.

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