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Journal articles on the topic 'Compositi'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 March 2023

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1

Grandini, Simone, Giuseppe Chiodera, Walter Devoto, and Angelo Putignano. "Utilizzo razionale dei compositi bulk nella pratica quotidiana." Dental Cadmos 86, no. 09 (September 2018): 802. http://dx.doi.org/10.19256/d.cadmos.09.2018.08.

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2

Olivito, Renato S., and Rosamaria Codispoti. "Natural Fiber Composites for Structural Strengthening of Constructions." Key Engineering Materials 916 (April 7, 2022): 66–73. http://dx.doi.org/10.4028/p-qg327p.

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Negli ultimi anni vengono studiate le fibre naturali di origine vegetale come lino, juta, canapa, basalto oltre a quelle derivate dal bambù o dall'ananas, per le loro molteplici proprietà. Tra i principali vantaggi che hanno, ricordiamo: la grande disponibilità in natura; sono rinnovabili, hanno una bassa densità e un costo contenuto, nonché proprietà meccaniche che li rendono interessanti per la realizzazione di materiali compositi fibrorinforzati. Sono utilizzati da tempo in vari settori dell'ingegneria: dall'automotive e aerospaziale all'ingegneria civile per la realizzazione di pannelli, pareti ecc. Attualmente l'attenzione è stata focalizzata sulla possibilità di utilizzarli come materiali di rinforzo su strutture in muratura. Il continuo e crescente interesse per la conservazione dei beni storici richiede sistemi di rinforzo di facile utilizzo e affidabili con relative metodologie di calcolo che permettano di valutare la capacità delle strutture murarie esistenti e rinforzate. Tuttavia, i modelli analitici applicabili alle strutture in muratura armata non sono stati sviluppati allo stesso livello di quelli per altri materiali da costruzione moderni. In particolare, esiste un divario tra i risultati sperimentali di elementi murari armati con sistemi innovativi ei risultati ottenuti da modelli analitici. Tutto ciò ha ostacolato un'analisi completa dell'approccio sperimentale che può fornire un prezioso contributo a metodi di progettazione eccessivamente conservativi per soluzioni di rinforzo innovative. Nel presente lavoro, al fine di validarne l'efficacia vengono mostrati i risultati di un'ampia campagna sperimentale per la caratterizzazione meccanica di compositi con fibre naturali e la loro applicazione ad elementi strutturali in muratura, in diverse condizioni di carico applicato e geometrie murarie. Parole chiave: Fibre naturali – Compositi – FRCM - Massoneria
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3

Bernasconi, A., F. Cosmi, and D. Dreossi. "Analisi dell’anisotropia microstrutturale in materiali compositi rinforzati con fibre corte." Frattura ed Integrità Strutturale 2, no. 3 (March 22, 2008): 18–29. http://dx.doi.org/10.3221/igf-esis.03.03.

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4

Manauta, Jordi, Walter Devoto, and Angelo Putignano. "In & Out: i segreti della stratificazione dei materiali compositi." Dental Cadmos 82, no. 4 (April 2014): 270–73. http://dx.doi.org/10.1016/s0011-8524(14)70163-1.

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5

Saracinelli, Monaldo, Giuseppe Marchetti, Walter Devoto, and Angelo Putignano. "Uso razionale dei moderni compositi negli anteriori, anche con discromie gravi." Dental Cadmos 85, no. 10 (December 2017): 675. http://dx.doi.org/10.19256/d.cadmos.10.2017.10.

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6

Cartone, Alfredo, and Paolo Postiglione. "Le componenti principali pesate geograficamente per la definizione di indicatori compositi locali." RIVISTA DI ECONOMIA E STATISTICA DEL TERRITORIO, no. 1 (June 2016): 33–52. http://dx.doi.org/10.3280/rest2016-001002.

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7

Berrone, M., E. Crosetti, P. L. Tos, M. Pentenero, and G. Succo. "Fibular osteofasciocutaneous flap in computer-assisted mandibular reconstruction: technical aspects in oral malignancies." Acta Otorhinolaryngologica Italica 36, no. 6 (December 2016): 469–78. http://dx.doi.org/10.14639/0392-100x-1282.

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L’utilizzo della pianificazione virtuale in chirurgia testa e collo è in forte crescita. In letteratura, la validità del metodo dal punto di vista dell’acuratezza e l’utilità clinica sono stati ampiamente documentati, in modo particolare per il rimodellamento osseo del lembo. Al giorno d’oggi, l’aumentato utilizzo della programmazione virtuale in chirurgia oncologica testa-collo e, conseguentemente, la maggiore necessità di ricostruzioni sia ossee che dei tessuti molli, rendono importante realizzare il programma virtuale considerando non solo la ricostruzione ossea, ma anche tutti gli aspetti relativi alla ricostruzione dei tessuti molli con lembi compositi. Descriviamo nel seguente articolo il nostro approccio alla pianificazione virtuale nel caso di lembi compositi. Lo studio riporta sei pazienti consecutivi con malattia maligna programmati mediante ricostruzione mandibolare computer assistita e lembi osteo-fascio-cutanei di perone. In tutti i sei pazienti, la resezione e la ricostruzione sono state progettate concentrandosi sulla posizione dei vasi perforanti cutanei, al fine di programmare la posizione più corretta delle guide di taglio a livello del perone in funzione della posizione dei vasi perforanti stessi. La tecnica descritta ci ha permesso di programmare lembi osteo-fascio-cutanei di perone nella ricostruzione mandibolare computer assistita, con buona precisione della posizione del segmento osseo rispetto alla padella cutanea, importante per la ricostruzione dei tessuti molli. Nonostante il numero limitato di casi, i risultati preliminari dello studio suggeriscono che questo protocollo è utile nella programmazione virtuale. Sono necessarie ulteriori indagini.
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8

Beretta, S., A. Bernasconi, A. Pirondi, and F. Moroni. "Analisi basata sugli sforzi locali della resistenza a fatica di giunzioni incollate di materiali compositi." Frattura ed Integrità Strutturale 3, no. 9 (July 1, 2009): 145–52. http://dx.doi.org/10.3221/igf-esis.09.15.

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9

Scolavino, Salvatore. "Modifiche di forma mediante restauri adesivi diretti combinando compositi ad alta e bassa diffusione della luce." Dental Cadmos 90, no. 03 (February 2022): 239. http://dx.doi.org/10.19256/d.cadmos.03.2022.10.

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10

Luchetti, Alberto. "La traduzione, esigenza e possibilitŕ dell'opera." PSICOTERAPIA E SCIENZE UMANE, no. 2 (June 2010): 189–200. http://dx.doi.org/10.3280/pu2010-002003.

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Che la traduzione, altra professione impossibile, sia costruzione dell'originale č esemplarmente evidenziato dalla psicoanalisi, che interroga in modo peculiare il rapporto dell'uomo col linguaggio e le lingue. Freud, oltre a praticare la traduzione e a usarla insistentemente come metafora, arrivň a proporla come modello della memoria e del funzionamento psichico, dunque ipotizzando l'inconscio come intradotto e intraducibile, eppure incessantemente ritradotto. Alla maniera dei "ritratti compositi" o "immagini generiche" di Galton, la sovrapposizione delle diverse traduzioni dell'opera freudiana nelle diverse lingue, nella loro oscillazione tra etnocentrismo e "prova dello straniero", tra ricentramento e decentramento, contribuiscono a figurare concretamente l'astrazione dell'inconscio sessuale, la scoperta del volto eccentrico di ogni individualitŕ. In questo senso la traduzione costituirebbe non solo una esigenza ma altresě una possibilitŕ dell'opera freudiana.
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11

Ceschini, L., A. Morri, F. Rotundo, G. L. Garagnani, and M. Merlin. "Caratterizzazione microstrutturale e prove di resilienza su giunti Friction Stir Welding e Linear Friction Welding di compositi a matrice metallica." Frattura ed Integrità Strutturale 4, no. 12 (April 1, 2010): 3–12. http://dx.doi.org/10.3221/igf-esis.12.01.

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12

Faye, Bernard, M. Kamil, and M. Labonne. "Teneur en oligo-éléments dans les fourrages et le plasma des ruminants domestiques en République de Djibouti." Revue d’élevage et de médecine vétérinaire des pays tropicaux 43, no. 3 (March 1, 1990): 365–73. http://dx.doi.org/10.19182/remvt.8816.

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L'analyse des teneurs en oligo-éléments de 17 fourrages et 310 plasmas (116 caprins, 83 ovins, 52 camelins, 59 bovins) en provenance de 38 sites de prélèvement a permis de révéler : l'étendue des carences en zinc sur l'ensemble du territoire avec des valeurs moyennes, à l'exception des bovins, inférieures aux normes admises (97,9 æg/100 ml pour les bovins, 71,5 pour les caprins, 65,9 pour les ovins et 46,2 pour les dromadaires); la sévérité des carences primaires en cuivre chez les dromadaires pâturant dans les mangroves de la côte d'Obock; la présence d'ataxie néonatale due à une carence secondaire en cuivre (liée à un excès de molybdène et de soufre) dans la région du lac Abbé; les particularités de la compositi on minérale des fourrés à Salvadora persica (pauvres en cuivre, zinc, manganèse, et riches à l'excès en molybdène, sélénium et soufre) et de la mangrove (très pauvre en cuivre, zinc, manganèse et sélénium). Dix zones géographiques naturelles sont analysées du point de vue du statut minéral des troupeaux et des carences ou excès potentiels liés aux fourrages dominants de ces dix biotopes
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13

Noviyanti, Atiek Rostika, Efa Nur Asyiah, Muhamad Diki Permana, Dina Dwiyanti, Suryana, and Diana Rakhmawaty Eddy. "Preparation of Hydroxyapatite-Titanium Dioxide Composite from Eggshell by Hydrothermal Method: Characterization and Antibacterial Activity." Crystals 12, no. 11 (November 10, 2022): 1599. http://dx.doi.org/10.3390/cryst12111599.

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Hydroxyapatite (HA) has been widely used in biomedical applications. HA is prepared from natural sources of eggshell. The obtained HA is composited with TiO2 using the hydrothermal method at a temperature of 230 °C. The structure and morphology of HA-TiO2 composites are characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and a scanning electron microscope (SEM). Meanwhile, its antibacterial activity was tested on Staphylococcus aureus and Escherichia coli bacteria. The formation of the HA-TiO2 composite is evidenced by typical peaks on the XRD pattern for HA and TiO2. The FTIR spectrum shows that no bond formed between TiO2 and HA which indicates the formation of composites. The smallest crystallite size and the highest specific surface area were obtained from the composite with the composition of HA-TiO2 30:70. In addition, the composition of the composite also shows the smallest particle size distribution. Therefore, the presence of TiO2 plays a significant role in determining the HA properties formed. Furthermore, the HA-TiO2 composite showed good antibacterial activity using disk diffusion and optical density (OD) methods. These results indicate that the synergistic combination of HA from eggshell with TiO2 has favorable properties for antibacterial activity.
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14

Virgiani, Yasmin Safira, Adioro Soetojo, and Nanik Zubaidah. "DISCOLORATION OF NANOHYBRID AND NANOFILLER RESIN COMPOSITES AFTER EXPOSURE TO TURMERIC." Conservative Dentistry Journal 11, no. 1 (June 30, 2021): 46. http://dx.doi.org/10.20473/cdj.v11i1.2021.46-49.

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Background: Recently, the demand of aesthetic restorative has greatly increased and enchourages the development of composite resin material. The latest technology of composite is nanohybrid and nanofiller composites. However, color stability of nanohybrid and nanofiller resin composites can be influence by intrinscic and (or) extrinsic factor. Intrinsic factor depends on the composition on the resin composite and extrinsic factor such as colored food and beverages. Turmeric as a food ingredients, that is often consumed by Indonesians can cause discoloration in composites, because it contains the active pigment curcuminoid. The discoloration of nanohybrid and nanofilles composites can caused by the process of water sorbstion and curcumin particles. Purpose: Explain the discoloration of nanohybrid and nanofiller resin composites after exposure to turmeric and the factor that influence. Review(s): The reaction between the curcumin contained in turmeric and nanohybrid as well as nanofiller composites can cause discoloration in both composites. One of the reasons behind the discoloration on composite resin is that the composite resin can absorb water and its substances are carried by the water. Discoloration of composites was influence by the concentration of turmeric solution, pH of the solution, finishing and polishing process, temperature, time of exposure, composition of filler and matrix. Conclusion: Turmeric as an extrinsic factor can cause color changes in nanohybrid and nanofiller composites (ΔE>3,3), where the level of color change can be obtained by intrinsic factors, such as composition of filler and matrix, and other extrinsic factors.
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15

Liu, Shih-Ming, Wen-Cheng Chen, Chia-Ling Ko, Hsu-Ting Chang, Ya-Shun Chen, Ssu-Meng Haung, Kai-Chi Chang, and Jian-Chih Chen. "In Vitro Evaluation of Calcium Phosphate Bone Cement Composite Hydrogel Beads of Cross-Linked Gelatin-Alginate with Gentamicin-Impregnated Porous Scaffold." Pharmaceuticals 14, no. 10 (September 29, 2021): 1000. http://dx.doi.org/10.3390/ph14101000.

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Calcium phosphate bone cement (CPC) is in the form of a paste, and its special advantage is that it can repair small and complex bone defects. In the case of open wounds, tissue debridement is necessary before tissue repair and the subsequent control of wound infection; therefore, CPC composite hydrogel beads containing antibiotics provide an excellent option to fill bone defects and deliver antibiotics locally for a long period. In this study, CPC was composited with the millimeter-sized spherical beads of cross-linked gelatin–alginate hydrogels at the different ratios of 0 (control), 12.5, 25, and 50 vol.%. The hydrogel was impregnated with gentamicin and characterized before compositing with CPC. The physicochemical properties, gentamicin release, antibacterial activity, biocompatibility, and mineralization of the CPC/hydrogel composites were characterized. The compressive strength of the CPC/hydrogel composites gradually decreased as the hydrogel content increased, and the compressive strength of composites containing gentamicin had the largest decrease. The working time and setting time of each group can be adjusted to 8 and 16 min, respectively, using a hardening solution to make the composite suitable for clinical use. The release of gentamicin before the hydrogel beads was composited with CPC varied greatly with immersion time. However, a stable controlled release effect was obtained in the CPC/gentamicin-impregnated hydrogel composite. The 50 vol.% hydrogel/CPC composite had the best antibacterial effect and no cytotoxicity but had reduced cell mineralization. Therefore, the optimal hydrogel beads content can be 25 vol.% to obtain a CPC/gentamicin-impregnated hydrogel composite with adequate strength, antibacterial activity, and bio-reactivity. This CPC/hydrogel containing gentamicin is expected to be used in clinical surgery in the future to accelerate bone regeneration and prevent prosthesis infection after surgery.
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Anita, Fenny. "Pengaruh Model Pembelajaran Kooperatif Tipe Cooperative Integrated Reading and Compositi (CIRC) dan Minat Baca Terhadap Keterampilan Menulis Karangan Deskripsi Siswa Kelas X SMA Negeri 1 Bangkinang." GERAM 8, no. 2 (December 21, 2020): 18–26. http://dx.doi.org/10.25299/geram.2020.vol8(2).5522.

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This research was conducted to explain the effect of the learning model CIRC and reading interest on the results of the descriptive essay writing skills of class X SMA Negeri 1 Bangkinang. This type of research is a quantitative study using a quasi-experimental method and a 2x2 factorial experimental design. The population of this study was students of class X SMA Negeri 1 Bangkinang. Sampling was done by purposive sampling with a sample size of 60 students. Data collection was carried out using two instruments, namely questionnaires and performance tests. Based on the research results, it can be concluded that four things are as follows. First, the skills of writing essays of descriptions of students taught using the learning model CIRC are better than those taught by conventional learning models of class X students of SMA Negeri 1 Bangkinang. Second, the writing skills of students who have high reading interest who are taught using the learning model CIRC are higher than students who have high reading interest who are taught using the conventional learning model of class X students of SMA Negeri 1 Bangkinang. Third, the writing skills of students who have low reading interest who are taught using the learning model CIRC are higher than students who have low reading interest who are taught using the conventional learning model of class X students of SMA Negeri 1 Bangkinang. Fourth, there is no interaction between reading interest and learning models in influencing the writing skills of descriptive essays of class X SMA Negeri 1 Bangkinang.
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Cavalli, Andrea, and Giuseppe Pontoriero. "Studio EVOLVE: un'altra delusione per i Nefrologi?" Giornale di Clinica Nefrologica e Dialisi 25, no. 3 (July 10, 2013): 261–65. http://dx.doi.org/10.33393/gcnd.2013.1050.

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Il calciomimetico Cinacalcet è ormai in uso da alcuni anni per il trattamento dell'iperparatiroidismo secondario (IPTS) nei pazienti dializzati, permettendo una buona riduzione dei livelli di paratormone. Nell'ottica di valutare un suo possibile effetto benefico nel migliorare la prognosi cardio-vascolare dei pazienti dializzati, è stato condotto lo studio randomizzato “Evaluation of Cinacalcet Hydrochloride Therapy to Lower Cardiovascular Events” (EVOLVE). Sono stati randomizzati a ricevere Cinacalcet o placebo 3883 pazienti dializzati affetti da iperparatiroidismo secondario moderato-severo, valutando come end-point compositi primari la mortalità e gli episodi di infarto mio-cardico, l'ospedalizzazione per angina instabile, lo scompenso cardiaco ed eventi vascolari periferici. Nell'analisi “intention-to-treat”, a causa di una bassa potenza statistica, non sono state rilevate differenze significative tra i due bracci dello studio, a fronte di una più elevata incidenza di ipocalcemia, nausea e vomito nei soggetti in terapia con il calciomimetico. I dati dello studio EVOLVE hanno sicuramente deluso la comunità nefrologica, che si sarebbe aspettata dei risultati positivi. La mancanza di risultati conclusivi e i costi elevati suggeriscono un uso giudizioso del Cinacalcet. Non di meno, anche se mancano dati conclusivi su “hard end-point”, ci sembra poco saggio negare strategie terapeutiche che includano il Cinacalcet ai pazienti con severo IPTS con elevati livelli di PTH (PTH >800 pg/mL) refrattari alla terapia standard e/o ipercalcemia e/o calcifilassi e/o elevato rischio chirurgico alla paratiroidectomia.
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18

Thovichit, K., N. Chaiwong, I. Sukjumreansri, and T. Amornsakchai. "F-8 HIGH IMPACT STRENGTH COMPOSITE FROM POLYETHYLENE FIBER(Session: Composites II)." Proceedings of the Asian Symposium on Materials and Processing 2006 (2006): 123. http://dx.doi.org/10.1299/jsmeasmp.2006.123.

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19

Subuki, Istikamah, Suffiyana Akhbar, and Farrah Khalidah Nor Wahid. "Influence of Thermoplastic PEG, GLY and Zein in PCL/TZ and HAp Bio Composite via Solid State Supercritical CO2 Foaming." Scientific Research Journal 17, no. 2 (August 27, 2020): 177. http://dx.doi.org/10.24191/srj.v17i2.9534.

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This study is aimed to investigate the characteristics of the composite containing blended poly (ɛ-caprolactone) (PCL), hydroxyapatite (HA) and thermoplastic zein (TZ). Thermoplastic zein was developed by mixing zein with glycerol (GLY) and polyethylene glycol (PEG). The thermal characterization of mixed TZ and bio composite was characterized in order to investigate the characterization of PCL/TZ/HA composites. The bio composited was then moulded and produce porous structure via solid state supercritical carbon dioxide (scCO2) foaming process. The specimen was saturated with CO2 for 6 hours at 50˚C and saturation pressure of 20MPa at high depressurization rate. The morphology of porous specimen produced were characterized by scanning electron microscopy (SEM). The results indicated that after polymer saturation with CO2, high depressurization causes the formation of nucleated gas cells that give rise to pores within the foamed specimens. The blended bio composite with composition of PCL60/TZ20/HAp20 exhibit well interconnected porous structure compared to other bio composite prepared. The foaming effect produce foams with heterogeneous morphologies on bio composite material at relatively low temperature.
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20

Temba, Makumba Chewe, Patrick Njobeh, Derek Ndinteh, and Eugenie Kayitesi. "Nutritional quality of maize–groundnut composite flours and resultant porridges." Nutrition & Food Science 47, no. 3 (May 8, 2017): 318–31. http://dx.doi.org/10.1108/nfs-07-2016-0100.

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Purpose The purpose of this study was to composite maize, a cereal grain with low protein and lysine content, with groundnut a rich source of protein, to improve the nutritional quality of maize–groundnut composite flours and their resultant porridges. Design/methodology/approach Defatted and full fat groundnut flours were used to prepare maize–groundnut composite flours and porridges at the ratio of 100:0, 55:45, 70:30 and 85:15, respectively. They were analyzed for proximate composition, energy value, amino acid and fatty acid profiles. Findings Compositing maize with groundnut significantly (p ≤ 0.05) increased proteins from 10 per cent in maize flour to up to 21 per cent in composite porridge (denoted DFC1). The energy values for composite porridges were 434 Kcal/100 g when compared with 398 Kcal/100 g established for maize porridge alone. Lysine content was three times higher in composite flours than for maize flour, while for composite porridges, lysine was four times higher than in maize porridge. There was an increase of 35 per cent in oleic acid content when maize flour was composited with groundnut flour. Research limitations/implications Further research is required to evaluate the properties of full fat and defatted maize–groundnut porridges and their effects on consumer acceptability. Originality/value It can be concluded that compositing maize with full fat and defatted groundnut has the capability of improving the nutritional quality of cereal-based diets consequently contributing to a significant increase in nutritional security of African populations and those of other developing countries of the world.
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Platnieks, Oskars, Sergejs Gaidukovs, Anda Barkane, Gerda Gaidukova, Liga Grase, Vijay Kumar Thakur, Inese Filipova, Velta Fridrihsone, Marite Skute, and Marianna Laka. "Highly Loaded Cellulose/Poly (butylene succinate) Sustainable Composites for Woody-Like Advanced Materials Application." Molecules 25, no. 1 (December 28, 2019): 121. http://dx.doi.org/10.3390/molecules25010121.

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We report the manufacturing and characterization of poly (butylene succinate) (PBS) and micro cellulose (MCC) woody-like composites. These composites can be applied as a sustainable woody-like composite alternative to conventional fossil polymer-based wood-plastic composites (WPC). The PBS/MCC composites were prepared by using a melt blending of 70 wt% of MCC processed from bleached softwood. MCC was modified to enhance dispersion and compatibility by way of carbodiimide (CDI), polyhydroxy amides (PHA), alkyl ester (EST), (3-Aminopropyl) trimethoxysilane (APTMS), maleic acid anhydride (MAH), and polymeric diphenylmethane diisocyanate (PMDI). The addition of filler into PBS led to a 4.5-fold improvement of Young’s modulus E for the MCC composite, in comparison to neat PBS. The 1.6-fold increase of E was obtained for CDI modified composition in comparison to the unmodified MCC composite. At room temperature, the storage modulus E′ was found to improve by almost 4-fold for the APTMS composite. The EST composite showed a pronounced enhancement in viscoelasticity properties due to the introduction of flexible long alkyl chains in comparison to other compositions. The glass transition temperature was directly affected by the composition and its value was −15 °C for PBS, −30 °C for EST, and −10 °C for MAH composites. FTIR indicated the generation of strong bonding between the polymer and cellulose components in the composite. Scanning electron microscopy analysis evidenced the agglomeration of the MCC in the PBS/MCC composites. PMDI, APTMS, and CDI composites were characterized by the uniform dispersion of MCC particles and a decrease of polymer crystallinity. MCC chemical modification induced the enhancement of the thermal stability of MCC composites.
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Panumati, S., T. Amornsakchai, and C. Ramesh. "F-9 HIGH STRENGTH POLYPROPYLENE FIBER FROM POLYPROPYLENE/CLAY COMPOSITE(Session: Composites II)." Proceedings of the Asian Symposium on Materials and Processing 2006 (2006): 124. http://dx.doi.org/10.1299/jsmeasmp.2006.124.

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23

Lechthaler, Manuel. "Intensional Composition as Identity." Grazer Philosophische Studien 97, no. 2 (June 3, 2020): 294–318. http://dx.doi.org/10.1163/18756735-000089.

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Composition as Identity claims that a composite object is identical to its parts taken collectively. This is often understood as reducing the identity of composite objects to the identity of their parts. The author argues that Composition as Identity is not such a reduction. His central claim is that an intensional notion of composition, which is sensitive to the arrangement of the composing objects, avoids criticisms based on an extensional understanding of composition. The key is to understand composition as an intensional kind of identity relation, many-one identity. Eventually, the author suggests an arrangement condition for many-one identity that allows him to distinguish between composite objects, even if they have the same parts.
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24

Fakhrudi, Yoga Ahdiat, Kholis Nur Faidzin, and Rahayu Mekar Bisono. "Effect of Composite Composition on Mechanical Properties of Banana Fiber Composites with Epoxy Matrix for Functional Materials." International Journal of Science, Engineering and Information Technology 6, no. 2 (July 31, 2022): 303–6. http://dx.doi.org/10.21107/ijseit.v6i2.15804.

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Technological developments and the influence of globalization have an impact on increasing the need for the amount of material for industry. The many disadvantages of metal materials due to their large mass, difficult manufacturing processes, corrosive properties, and high production costs have resulted in reduced use of metal materials in various products. Nowadays, there are many replacement materials with mechanical properties that can resemble metal materials such as composites. The role of composites is very important in the development of today's industrial world. This study wanted to determine the effect of the composite composition of rias banana fiber and teak sawdust with epoxy resin on the mechanical properties of the composite. The results showed that the comparison of the composition of the composite using rias banana fiber and teak sawdust with an epoxy matrix had an effect on the mechanical properties. Increasing the percentage of resin composition increases the value of the surface hardness of the composite. The highest level of Rockwell hardness with a value of 117 HRB in sample D and the lowest 109 HRB in sample A. While the highest max strength value was produced by sample C with a composition of teak sawdust: rias banana fiber: epoxy is 20% : 40% : 40 %. The conclusion of this research is the more resin composition will increase the composite hardness test value.
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Leal, José Pereira, Jaqueline Damasceno da Silva, Rafaelle Fernanda Melão Leal, Carlos da Cunha Oliveira-Júnior, Vera Lúcia Gomes Prado, and Glauber Campos Vale. "Effect of Mouthwashes on Solubility and Sorption of Restorative Composites." International Journal of Dentistry 2017 (2017): 1–5. http://dx.doi.org/10.1155/2017/5865691.

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Objective. Composites sorption and solubility can be precursors of several chemical and physical processes, which lead to deleterious effects on the polymer structure. This study evaluated the effect of mouthwashes on solubility and sorption of composite resins. Materials and Methods. Forty-two specimens of each evaluated composite (Filtek Bulk Fill Flow, Opallis Flow, Durafill VS, and Filtek Z350) were prepared and randomized into seven groups for each solution (mouth rinses with and without alcohol and distilled water) and stored for seven days. Solubility and sorption tests were performed according to ISO4049. Data were analyzed using 2-way-ANOVA followed by Tukey’s test for means comparison (α=0.05). In addition, paired t-test was performed to analyze the alcohol effect on the studied composite resin properties. Results. Listerine Cool Mint (containing alcohol in its composition) caused the greatest degree of sorption for all composites tested in comparison to other rinses, while for solubility this behavior was observed for Opallis Flow and Durafill VS composite resins (p<0.05). Regarding the composites, Opallis Flow showed the highest sorption and solubility values in general (p<0.05). Conclusion. Overall, the sorption and solubility of composites were higher in mouthwashes containing alcohol in its composition, with Opallis Flow being the most affected composite resin.
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Gao, Jing Long, and Yan Hui Liu. "Thermal and Electrical Properties of Polypropylene/Carbon Nanotube Composites." Advanced Materials Research 299-300 (July 2011): 802–5. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.802.

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In this work, the carbon nanotubes(CNTs) were reinforced with polypropylene(PP)matrix resins to improve the electrical and thermal properties of PP/ CNTs composites in different contents of 0,1, 3,and 5 wt.%. The surface, volume resistivity and crystallization type of the composites were investigated. As a result, the maximum degradation rate temperature of the composite is improved 30 °C, the surface resistivity and volume resistivity of composite are 5 ×106, 7 ×105,respectively, for the optimum composition of composite (CNTs 3 wt.%). The integrated XRD pattern of the composites shows the typical α-form PP crystals.
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27

Braga, R. R., and J. L. Ferracane. "Alternatives in Polymerization Contraction Stress Management." Critical Reviews in Oral Biology & Medicine 15, no. 3 (May 2004): 176–84. http://dx.doi.org/10.1177/154411130401500306.

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Polymerization contraction stress of dental composites is often associated with marginal and interfacial failures of bonded restorations. The magnitude of stress depends on composite composition (filler content and matrix composition) and its ability to flow before gelation, which is related to the cavity configuration and curing characteristics of the composite. This article reviews variations among studies regarding contraction-stress-testing methods and contraction stress values of current composites, and discusses the validity of contraction stress studies in relation to results from microleakage tests. The effects of lower curing rates and alternative curing routines on contraction stress values are also discussed, as well as the use of low-elastic-modulus liners. Moreover, studies with experimental dimethacrylate-based composites and recent developments in low-shrinkage monomers are described.
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28

Movchan, O. V., and K. O. Chornoivanenko. "In situ Composites: A Review." Uspehi Fiziki Metallov 22, no. 1 (March 2021): 58–77. http://dx.doi.org/10.15407/ufm.22.01.058.

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The review of the works on the fabrication-technology studies, patterns of structure formation, and properties of in situ composites is presented. The main advantage of in situ (natural) composites is the thermodynamic stability of their composition and the coherence (conjugation) of the lattices of the contacting phases. All these ones provide the composite with a high level of the physical and mechanical properties. As shown, composite materials of this type are formed in the process of directed phase transformations, such as eutectic crystallization, eutectoid decomposition, etc., caused by a temperature gradient, as well as a result of diffusional changes in composition. The conditions for the growth of in situ composites are formulated. The mechanisms of growth of composite structures of the eutectic type are considered. The factors influencing on the morphology of structures of the eutectic type are indicated. The considered technological methods make it possible to obtain materials with predetermined properties, in which the size, volumetric composition, and spatial arrangement of phases are characteristic of in situ composites. The paper provides a large number of examples of in situ composites: from low-melting Bi-based alloys to refractory eutectics based on Mo and W (Bi–MnBi, Cd–Zn, Al–Al3Ni, Al–Al4La, Al–Al10CaFe2, Al–Al9FeNi, Al–Al3Zr, Al–Al3Sc, Au–Co, Si–TaSi2, Cr–HfC, Cr–ZrC, Cr–NbC, Cr–NbC, Cr–TaC, Nb–Nb5Si3, Mo–ZrC, Mo–HfC, W–TiC, W–ZrC, W–HfC, etc.). Processes and aspects of structure formation are considered. The influence of additional doping on the structure and properties of composite materials of the eutectic type of binary systems, as well as the features of the structure formation of ternary colonies in the composite are considered.
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Lin, Xiao Yan, Xu Dong Li, Hong Song Fan, Yu Mei Xiao, Jian Lu, and Xing Dong Zhang. "Comparative Investigation of Coprecipitation and In-Situ Synthesis of Nanohydroxyapatite/Collagen Composite." Key Engineering Materials 284-286 (April 2005): 839–42. http://dx.doi.org/10.4028/www.scientific.net/kem.284-286.839.

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Hydroxyapatite/collagen (HA/COL) composites were prepared using coprecipitation and in-situ synthesis methods. All these processes yielded nanosize poorly crystallized hydroxyapatite/collagen composites. The low temperature in situ formed composites showed some features of natural bone in phase composition, crystal size and crystallinity. Compare with the composite prepared by coprecipitation synthesis, the composite resulted from a low temperature in situ synthesis method showed better homogeneity and mechanical properties. It is confirmed that the low temperature in situ synthesis method was an effective way to obtain biomimetic nanoHA/COL composites with good homogeneity and mechanical properties.
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30

G, Hareesha, N. Chikkanna, Saleemsab Doddamani, and Anilkumar S. Kallimani. "Effect of addition of SiC particles on the Microstructure and Hardness of Al-SiC composite." Metallurgical and Materials Engineering 27, no. 1 (March 22, 2021): 49–56. http://dx.doi.org/10.30544/590.

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This work aims to investigate the effect of the addition of silicon carbide particles on the microstructure and the hardness of the Al-SiC metal matrix composites. The said composite is prepared using the stir casting technique for different weight percentages of the SiC particles. The higher composition of the reinforcement causes the clustering of the particles in the matrix. Thus, research has to be carried out on the aluminum-silicon carbide composites with the reinforcement 3wt%, 6wt%, 9wt%, and 12wt% of SiC particles to obtain the optimized composition. In order to study the microstructure and the reinforcement distribution in the matrix, a scanning electron microscope is utilized. The hardness testing has been carried out using the Vickers’ indentation technique for the as-cast and age hardening conditions. From the microstructural study, it is observed that the microstructure of the said composite exhibits the uniform distribution of the reinforcement. The EDX results show the presence of the reinforcing elements in the Al-SiC composite. From the results obtained from the hardness testing, it is observed that the presence of the carbide element in the composite increases the hardness of the Al-SiC particulate composites.
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Forysenkova, A. A., P. V. Slukin, E. S. Trofimchuk, G. A. Davydova, and I. V. Fadeeva. "Mineral-polymer composite with cation-substituted calcium phosphates." Perspektivnye Materialy 7 (2022): 35–48. http://dx.doi.org/10.30791/1028-978x-2022-7-35-48.

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Powders of copper, zinc, manganese-substituted tricalcium phosphates (TCP) were synthesized, the composition and structure of the obtained compounds were studied. It is shown how copper, zinc and manganese ions affect the phase composition and microstructure of powders substituted with TCP. Composite materials based on a blend of polyvinylpyrrolidone with alginate (PVP:ALG) containing copper, zinc, and manganese-substituted TCP have been obtained. The thermal stability and mechanical strength of composite films crosslinked with polyvalent metal ions have been studied. The least strong, but at the same time more thermally stable composites crosslinked with alkaline earth metal ions. The test for cytotoxicity of powders substituted TCP’ extracts and composites showed that the powders and composite materials with them are non-toxic and biocompatible. The study of the antibacterial activity of the materials against the Escherichia coli C600 strain showed that the growth of bacteria was inhibited by the samples containing copper-TCP and zinc-TCP. The composite with manganese-TCP showed no activity against Escherichia coli C600. Composites based on the PVP:ALG blend with copper, zinc-substituted TCP can be considered as materials with an antibacterial effect for use in medicine.
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32

Zhao, Zhong Min, Long Zhang, Hong Bai Bai, Jian Zheng, Jian Jiang Wang, and Y. Fu. "Fabrication of Nano-Micron Al2O3-ZrO2 Ceramic Eutectic Composites from the Melts by the SHS Metallurgical Process." Key Engineering Materials 280-283 (February 2007): 1053–56. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1053.

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New nano-submicron textured Al2O3-ZrO2 ceramic eutectic composites were obtained from high-temperature melts produced by the SHS metallurgical process with intro-granular and 1-3 composite structures. Nano-micron textured ceramic composites were naturally self-assembled in one quick step by the SHS metallurgical process, in-situ synthesis and symbotic eutectic transformation under high degree of undercooling. The experimental results indicated that the Al2O3-ZrO2 ceramic eutectic composites with ZrO2 fibers at the nano-submicron scale are only suitable for the ceramic composite with hypoeutectic composition under the conditions of the experiment.
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33

Wang, Jing, Ying Bin Cao, Dong Lin, Rong Jun Liu, and Chang Rui Zhang. "Effect of Infiltration Temperature on the Composition and Mechanical Property of RMI C/C-SiC Composite." Materials Science Forum 816 (April 2015): 71–77. http://dx.doi.org/10.4028/www.scientific.net/msf.816.71.

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C/C-SiC composites were prepared by reactive melt infiltration process at different temperatures. The composition, microstructures and mechanical properties of the composites were investigated. The results showed that infiltration temperature could affect composite’s properties through regulating the chemical composition and interfacial bonding strength of the composites. The C/C-SiC composite prepared at 1650°C exhibited the relatively highest performance with density of 2.24 g·cm-3 and SiC content of 31.44 vol.%. The flexural strength and the fracture toughness were 238MPa and 10.04 MPa·m1/2, respectively.
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34

Buyong, Siti Aishah, Shamsul Baharin Jamaludin, and Rohaya Abdul Malek. "Effect of Beta Tricalcium Phosphate (β-TCP) on Properties of Mg-Zn Composites." Key Engineering Materials 594-595 (December 2013): 203–6. http://dx.doi.org/10.4028/www.scientific.net/kem.594-595.203.

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In this work, Mg and Zn powder were used to prepare the Mg-Zn/β-TCP composites with different β-TCP composition by using powder metallurgy technique. The composite were mixed using ball mill and compacted at 500 MPa. The composites sintered at 450 °C in tube furnace for two hours. The effects of properties on Mg-Zn with different composition of β-TCP were studied. The results on the effect of β-TCP composition were analyzed in terms of density and microstructural analysis.
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35

Ab Ghani, Ahmad Fuad. "Hybrid Carbon/Glass Fiber Reinforced Polymer; A Frontier Material for Aerospace Industry : A Review on Mechanical Properties Enhancement." Current Science and Technology 1, no. 2 (December 29, 2021): 41–51. http://dx.doi.org/10.15282/cst.v1i2.6919.

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Composite is the combination of two or more materials that differ in properties and composition to form unique properties. This paper reported in the literature on the field of deformation of hybrid composite under tensile, shear and flexural loading are presented in this chapter. This article review provides insight and state of the art for mechanics of composites that provides underlying theory for understanding the deformation and behaviour for the hybrid composite under various loading conditions. This paper also discusses mechanical behaviour of hybrid composites under static loading (Tensile, Shear, Flexural). It is essential to understand the principle that governs the mechanics of composites of laminate under loading which also applicable to hybrid composites C/GFRP.The high modulus fibre, such as Carbon fibre offers stiffness and load bearing capabilities, whereas the low modulus fibre, such as glass fibre makes the composite more durable and low in cost
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36

Fang, Ming Hao, Zhao Hui Huang, Yan Gai Liu, Xin Min, and Li Na Zhang. "Preparation of Sialon/Si3N4-SiC Composite Refractories Using Kyanite Tailings." Key Engineering Materials 697 (July 2016): 467–71. http://dx.doi.org/10.4028/www.scientific.net/kem.697.467.

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Sialon-SiC composite powders were synthesized from kyanite tailings through the carbothermal reduction nitridation (CRN) technique. Using Sialon-SiC composites to substitute Si3N4 composites via the CRN technique synthesize Sialon/Si3N4-SiC composite refractories. The phase composition, cross section morphology, and the substituent amount of Sialon-SiC composites impact on refractories mechanical properties were investigated, respectively. The optimized synthesis temperature for the CRN reaction was found to be 1550 °C for 4 h with the excess carbon 20%. The substituent amount of Sialon-SiC was 25%, the mechanical properties of Sialon/Si3N4-SiC composite refractories reached optimal performance, which bending strength value was 41.8 MPa and compression strength value was 61.6 MPa.
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37

Zhao, Guo Long, Chuan Zhen Huang, Han Lian Liu, Bin Zou, Hong Tao Zhu, and Jun Wang. "Synthesis of Al2O3 Ceramics Matrix Composites by Thermal Explosion under Pressure and Hot Pressing." Advanced Materials Research 690-693 (May 2013): 534–37. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.534.

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Three kinds of Al2O3 ceramics matrix composites, such as Al2O3-TiB2, Al2O3-SiC and Al2O3-TiC, were prepared by two steps, which were synthesis of the composites by thermal explosion under a pressure of 20MPa and hot pressing of the composites at 1700°C under a pressure of 32MPa respectively. The preparation process, the composition and the microstructure of the composites were investigated in detail. The Gibbs free energy and the adiabatic temperature (Tad) of three exothermic synthesis reactions were calculated. Disc-shaped and elongated TiB2 grains were synthesized in the Al2O3-TiB2 composite. Some whiskers and platelet grains were synthesized in the Al2O3-SiC composite. Nano-particles were synthesized in the Al2O3-TiC composite and distributed both within the Al2O3 matrix grains and along the grain boundaries.
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38

Liu, Gui Wu, Chong Jian Zhou, San Tuan Zhao, Kuo Zhang, Zhi Guo Ye, and Guan Jun Qiao. "Preparation Technology and Mechanical Properties of Fe-C Composites Fabricated by Plasma Activated Sintering." Applied Mechanics and Materials 345 (August 2013): 223–27. http://dx.doi.org/10.4028/www.scientific.net/amm.345.223.

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The Fe-C composites were fabricated by a combination of high-energy ball milling of Fe-C powder mixtures and plasma activated sintering process. An orthogonal experiment in four factors (including original powder composition, sintering temperature, applied pressure and holding time) and three levels was employed to investigate the effects of preparation technology on mechanical properties (bending strength and hardness) of the Fe-C composite. The experimental results show that the crystalline Fe3C phase can be produced by the rapid sintering process, though it is cannot form theoretically due to the high Gibbs free energy, and more or less holes and composition segregation phenomenon coexist in the composite. The original powder composition plays the leading role in both the mechanical properties of the Fe-C composites. However, the effects of the other parameters on the bending strength and hardness of the composite are somewhat different. The optimal technology combinations for the bending strength and hardness are obtained as follows: 50Fe+50Fe3C/1373 K/400 s/20 MPa and 50Fe+50Fe3C/50 MPa/1273 K/400 s, respectively.
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39

Isnaini, Steella Ilham, Twi Agnita Cevanti, Nur Shiyama Purnama Sari, Mahardika F. Rois, W. Widiyastuti, and Heru Setyawan. "Effect of Cellulose Fiber from Coconut Coir as Filler For Dental Flowable Composite." Journal of Physics: Conference Series 2344, no. 1 (September 1, 2022): 012019. http://dx.doi.org/10.1088/1742-6596/2344/1/012019.

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Abstract The composite restorations in posterior teeth have recently received an increasing interest due to the improvement of their physical and mechanical properties. However, compositing by the most common polymerization procedure tends to deform the tooth structure that may cause some damage in the marginal seal due to the imperfect interfacial attachment. Several techniques have been used to overcome this problem, one of them is using a flowable composites on the bottom of the cavity as the first layer. The purpose of this study is to develop fiber-reinforced composite (FRC) material made of coir fiber (Cocos nucifera) with matrix (Bis-GMA, TEGDMA, DGEBA, and camphorquinone). Cellulose fiber was formed by an anti-solvent method from an aqueous NaOH-urea cellulose solution dropped into ethanol-water mixture. The resulting cellulose fibers were then mixed with the matrix using a magnetic stirrer. The composition of nanocellulose in the matrix was varied 10:90 and their characteristics were compared with the commercial nanofiller composite (Z 350 and 3M) as control. The sample was tested for cross-linked using a scanning electron microscope (SEM) and Fourier transform infrared (FTIR). The morphology of nanocellulose look like a fiber as cross-linked with matrix. Therefore, the formation of a crosslink bond between cellulose and matrix C-O-C with a new wavenumber in 890 cm-1. The nanocellulose composite also form fibers that binds the matrix, while flowable composites from manufacturers from fibers and particulates. From this experimental method it can be suggested coconut fiber has high potential as raw material to be filler in a dental flowable composite.
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40

Nenastina, Tetiana, Nikolai Sakhnenko, Valeria Proskurina, and Natalia Horokhivska. "MODELING THE CONTENT OF COMPONENTS OF COMPOSITE ELECTROLYTIC COVER FROM THE POLARIZATION CURRENT." Bulletin of the National Technical University «KhPI» Series: New solutions in modern technologies, no. 3(13) (October 26, 2022): 81–85. http://dx.doi.org/10.20998/2413-4295.2022.03.12.

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The composite coatings electrodeposition with the refractory metals and zirconium with cobalt makes it possible to obtain a coating with a unique combination of physicochemical properties that are unattainable when using other application methods. One of the reasons for the limited use of the electrolytic method of coating with such composites is the difficulty of controlling the process. The properties of alloys of the iron subgroup with refractory metals and composites depend not only on the chemical composition (the content of the refractory component) but also on the deposition conditions. Varying the polarization current density allows the creation of coatings of different compositions and, accordingly, different functional properties. The basis of the work was experimental research on the physicochemical patterns of electrolytic deposition of cobalt-based composite coatings by the galvanostatic current. The purpose of the work was to develop a mathematical model of the dependence of the cobalt-containing composite coatings formation on the polarization current density. The problem of describing the electrochemical deposition of metals, alloys and composite coatings is relevant since mathematical modeling is an integral part of the development of new and improvement of existing systems. A mathematical model is proposed to control the composition of composite electrolytic coatings based on cobalt, which allows obtaining coatings of a predetermined composition when varying the density of the operating current. It has been established that the composition of coatings, in particular the content of Co, Mo, W, can be controlled by varying the electrolysis current density, using quite simple developed mathematical models. The inclusion of Zr in the composition of composite coatings is described by a more complex model, in which the parameter values depend on both the concentration of the electrolyte components and the electrolysis conditions.
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41

Karunakaran, C., and A. Vijayabalan. "Photocatalytic Activities of CdO-Fe2O3, CdO-CuFe2O4 and CdO-ZnFe2O4 Nanocomposites." Materials Science Forum 764 (July 2013): 206–18. http://dx.doi.org/10.4028/www.scientific.net/msf.764.206.

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Magnetically separable CdO-Fe2O3, CdO-CuFe2O4 and CdO-ZnFe2O4 nanocomposites have been prepared by precipitation method. The X-ray diffractogram shows face centered cubic CdO, cubic CdO2, rhombohedral α-Fe2O3, orthorhombic β-Fe2O3, cubic γ-Fe2O3 and tetragonal FeOOH as the constituents of CdO-Fe2O3 composite. The components of CdO-CuFe2O4 composite are face centered cubic CdO, body centered tetragonal CuFe2O4 and cubic γ-Fe2O3. Face centered cubic CdO and ZnFe2O4, cubic γ-Fe2O3 and rhombohedral α-Fe2O3 are the constituents of CdO-ZnFe2O4 composite. The energy dispersive X-ray spectra confirm the presence of the corresponding elements and provide the composition. The scanning electron micrographs show that the composite particles are of spherical shape and of nanodimension. The composites absorb visible light. The charge transfer resistances of the composites are larger than their constituents. CdO-Fe2O3 and CdO-CuFe2O4 composites display ferromagnetic behavior. The visible light-photocatalytic activities and bactericidal activities of the composites are larger than their precursors.
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42

Muflikhah, Muflikhah, Wildan Zakiah Lubis, Irma Septi Ardiani, Khoirotun Nadiyyah, and Sulistioso Giat Sukaryo. "SYNTHESIS AND CHARACTERIZATION OF HPMC/HAp/Fe3O4 COMPOSITE FOR HYPERTHERMIA APPLICATION." Jurnal Sains Materi Indonesia 21, no. 4 (December 15, 2020): 170. http://dx.doi.org/10.17146/jsmi.2020.21.4.6023.

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SYNTHESIS AND CHARACTERIZATION OF HPMC/HAp/Fe3O4 COMPOSITE FOR HYPERTHERMIA APPLICATION. Magnetic material become subject of intense research for hyperthermia application, and injectable magnetic hyperthermia for bone cancer is one of this research interest. In this study, composite of hydroxyapatite (HAp) and Fe3O4 in Hydroxypropyl-methyl cellulose (HPMC) matrix (HPMC/HAp/Fe3O4) has been synthesized in gel form that are expected can be applied for injectable bone substitute (IBS) in hyperthermia therapy. Composites were made using conventional methods by mixing HAp powder with ferrofluid Fe3O4 in HPMC solution. The composition of the composites were varied with the mass comparison of HPMC: HAp: Fe3O4 was 1: 0: 0; 1: 3: 0; 1: 2: 0.5; 1: 1: 0.25; and 1: 0: 3. The physical, chemical, and magnetic properties of the composites were characterized using X-Ray Diffractometer (XRD), Fourier Transform Infrared Spectrometry (FT-IR), Particle Size Analyzer (PSA), and Vibrating Sample Magnetometer (VSM). The XRD characterization results of the HPMC/HAp/Fe3O4 composite showed the crystalline phase of the constituent components. Saturation magnetization of the HPMC/HAp/Fe3O4 composite was 2.72 emu/g and 1.79 emu/g for the composition of 1: 2: 0.5 and 1:1:0.25 respectively. HPMC/HAp/Fe3O4 composite has superparamagnetic and biocompatible properties, so that can be applied as IBS in hyperthermia therapy for bone cancer.
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43

Paknahad, Elham, and Andrew P. Grosvenor. "Investigation of CeTi2O6- and CaZrTi2O7-containing glass–ceramic composite materials." Canadian Journal of Chemistry 95, no. 11 (November 2017): 1110–21. http://dx.doi.org/10.1139/cjc-2016-0633.

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Glass–ceramic composite materials are being investigated for numerous applications (i.e., textile, energy storage, nuclear waste immobilization applications, etc.) due to the chemical durability and flexibility of these materials. Borosilicate and Fe–Al–borosilicate glass–ceramic composites containing brannerite (CeTi2O6) or zirconolite (CaZrTi2O7) crystallites were synthesized at different annealing temperatures. The objective of this study was to understand the interaction of brannerite or zirconolite-type crystallites within the glass matrix and to investigate how the local structure of these composite materials changed with changing synthesis conditions. Powder X-ray diffraction (XRD) and Backscattered electron (BSE) microprobe images have been used to study how the ceramic crystallites dispersed in the glass matrix. X-ray absorption near edge spectroscopy (XANES) spectra were also collected from all glass–ceramic composite materials. Examination of Ti K-, Ce L3-, Zr K-, Si L2,3-, Fe K-, and Al L2,3-edge XANES spectra from the glass–ceramic composites have shown that the annealing temperature, glass composition, and the loading of the ceramic crystallites in the glass matrix can affect the local environment of the glass–ceramic composite materials. A comparison of the glass–ceramic composites containing brannerite or zirconolite crystallites has shown that similar changes in the long range and local structure of these composite materials occur when the synthesis conditions to form these materials or the composition are changed.
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44

Journal, Baghdad Science. "Synthesis and Environmental Application of BiOI/BiOCl Composites." Baghdad Science Journal 11, no. 2 (June 1, 2014): 469–76. http://dx.doi.org/10.21123/bsj.11.2.469-476.

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This work illustrates an enhanced visible light photocatalytic degradation of methyl orange dye (M.O.) by employing BiOI / BiOCl composites prepared under room temperature and without any organic precursors. Various experimental parameters have been studied, namely; composition of the composite, irradiation time and cell material. Composition D which implied 75% BiOI and 25% BiOCl has shown the highest bleaching of M.O. dye. This confirms the optimum photo-sensitization phenomenon for this composition in comparison to others. In the optimum photo-sensitized composite the electron of the conduction band reveals better reducing power and the hole of the valence band exhibits more oxidative power than those of pure BiOI electron and hole. Accordingly, under appropriate experimental conditions, methyl orange was significantly bleached using composite D.
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45

Pereda, B., Beatriz López, and J. M. Rodriguez-Ibabe. "Relevance of Static and Dynamic Recrystallizations on Austenite Grain Refinement in Nb-Mo Microalloyed Steels." Materials Science Forum 638-642 (January 2010): 687–92. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.687.

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Composite systems composed of nanocrystalline apatites and oligolactide-based polymer networks were prepared resulting in malleable and even injectable formulations which can be cured to compact materials at body temperature. Porous devices with inter-connective porosity were obtained after addition of suitable foaming agents to the composite mixtures. Setting time, porosity and mechanical properties of the composites can be properly adjusted by varying the educt composition. The determined compressive strengths and Young’s moduli of the porous composites perfectly match the mechanical characteristics of cancellous bone material. Preliminary in vitro cell culture experiments with compact composite materials demonstrated their good cytocompatibility. Based on these findings, the synthesized nano-structured composites represent promising candidates for the development of new biomaterials usable in hard tissue regeneration.
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46

Berger, Stefan, Jürgen Weisser, Eberhard Müller, and Matthias Schnabelrauch. "In Situ Hardening Biodegradable and Malleable Polymer-Nanoapatite Composites." Materials Science Forum 638-642 (January 2010): 693–99. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.693.

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Composite systems composed of nanocrystalline apatites and oligolactide-based polymer networks were prepared resulting in malleable and even injectable formulations which can be cured to compact materials at body temperature. Porous devices with inter-connective porosity were obtained after addition of suitable foaming agents to the composite mixtures. Setting time, porosity and mechanical properties of the composites can be properly adjusted by varying the educt composition. The determined compressive strengths and Young’s moduli of the porous composites perfectly match the mechanical characteristics of cancellous bone material. Preliminary in vitro cell culture experiments with compact composite materials demonstrated their good cytocompatibility. Based on these findings, the synthesized nano-structured composites represent promising candidates for the development of new biomaterials usable in hard tissue regeneration.
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47

Farmakovskaya, A., N. Okorokova, and A. Perchenok. "Study of high-frequency magnetic properties of composites and multi-layer films." E3S Web of Conferences 371 (2023): 04006. http://dx.doi.org/10.1051/e3sconf/202337104006.

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This paper examines the high-frequency magnetic properties of heterogeneous nanogranular composites (Co45Fe45Zr10)X(Al2O3)100-X, obtained by ion-beam sputtering of composite target on the sitallic substrates. It is shown that in the region of metallic phase concentrations from 32 to 42 at. % μ/ and μ// have high values, which are significantly higher than those of bulk composites of similar composition. As the composite layers approach the threshold, both the real and imaginary portions of the complex magnetic permeability decrease.
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48

Ragunathan, Santiagoo, Hanafi Ismail, and Hussin Kamarudin. "The Effect of Silane Treatment on Processing Characteristic and Swelling Behavior of Polypropylene/Recycled Acrylonitrile Butadiene Rubber/Rice Husk Powder Composites." Key Engineering Materials 471-472 (February 2011): 478–83. http://dx.doi.org/10.4028/www.scientific.net/kem.471-472.478.

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The effect of silane treatment on processing characteristic and swelling behavior of recycled acrylonitrile butadiene rubber (NBRr)/polypropylene (PP)/rice husk powder (RHP) composites has been studied. Polypropylene/recycled acrylonitrile butadiene rubber/rice husk powder (PP/NBRr/RHP) composite were prepared by melt mixing technique at 180º C for 9 minutes and 50rpm rotor speed using an internal mixer. Five different composites compositions (70/30/0, 7030/5, 70/30/10, 70/30/15 and 70/30/30), with silane treated RHP (treated) and without silane treatment RHP (untreated) was studied. The specimens were analyzed for swelling behavior with ASTM oil No.3 and processing torque of composites was obtained during composite preparation. The results showed that swelling percentage for both composites increased with NBRr content. However the treated composites exhibited lower swelling characteristics. Processing torque of both composites also showed higher torque reading with increasing NBRr content. However the treated composite with silane exhibited much higher torque value for similar composition composites. Better interaction between RHP filler and PP/NBRr matrixs was obtained with treated composites.
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49

Epaarachchi, Jayantha Ananda, and Matthew T. Reushle. "Performance of Aluminium / Vinylester Particulate Composite." Materials Science Forum 654-656 (June 2010): 2656–59. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2656.

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The performances of aluminum /vinylester particulate-composites were studied in detail in order to investigate its suitability for engineering applications. This study examined the suitability of atomised aluminum particles for particulate reinforcement of a vinyl ester resin. Mechanical properties were obtained for the composite by testing various percentages of aluminium powder (75-150 m) and vinylester resin. It has been found that the inclusion of Al powder has not significantly changed the properties of vinylester resin, however an improvement in the ductility of the composite has been recorded. The optimal performances of the composite were exhibited by 15% Al composition. The properties of the particulate composites were modeled using numerous empirical models. Unfortunately a significant difference was found between some of the experimental and predicted properties of the Al/vinylester particulate composite. This paper intends to detail the variation of mechanical properties with the change of Al volume fraction in the composite and the performances of empirical models in prediction of the properties of particulate composites.
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50

Pastrav, Ovidiu Cristian, Ada Gabriela Delean, Codruta Sarosi, Laura Silaghi Dumitrescu, Alexandrina Muntean, Marius Gociu, and Marioara Moldovan. "Translucence Study through New Experimental Hybrid Composites." Key Engineering Materials 614 (June 2014): 148–54. http://dx.doi.org/10.4028/www.scientific.net/kem.614.148.

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Translucence parameters for 3 series of experimental hybrid composites were investigated using three-chromatic coordinates such as L* a* b* CHROMA technique using a type C illuminant geometry with the scope of 8o. The materials of each series contain in the same ratio different copolymers and a filler mixture (simple and mixed hydroxyapatite-ZrO2 or SiO2 powders and glass powders with barium oxide, respective strontium oxide, or quartz powder). The purpose was to determine the effect of filler composition of composites on translucence. The analysis shows that these materials have more or less translucence. CHROMA determinations indicate that for the composite that has as filler quartz microparticles anh hydroxyapatite nanoparticles, the translucence registered is higher. Results leading to the idea that chemical composition and the size of inorganic phase are important to obtain translucent composite materials that have very natural in appearance. Keywords: translucence, hybrid composites, CHROMA method.
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