المؤلفون: Fu, Yikai¹ (AUTHOR), Zhang, Yu¹ (AUTHOR), Dai, Haitao¹ (AUTHOR) htdai@tju.edu.cn, Gao, Meini¹ (AUTHOR), Hao, Xichen¹ (AUTHOR), Arain, Samia¹ (AUTHOR), Ahmad, Aneela¹ (AUTHOR), Wang, Yuhan¹ (AUTHOR), Li, Jia^2,3 (AUTHOR), Mohamed, Zolkefl A. Y.¹ (AUTHOR), Chen, Zhenda¹ (AUTHOR), Cao, Yaxian¹ (AUTHOR), Wang, Ruotong¹ (AUTHOR), Yao, Buyi¹ (AUTHOR), Lu, Qieni^2,3 (AUTHOR), Liu, Changlong¹ (AUTHOR), Liu, Ying¹ (AUTHOR), Feng, Shouzhong⁴ (AUTHOR)

المصدر: Journal of Applied Physics. 2/28/2024, Vol. 135 Issue 8, p1-7. 7p.

مصطلحات موضوعية: *ELECTROMAGNETIC interactions, *FILLER materials, *PHOTONIC crystals, *COMPUTER simulation, *LASERS, *PHONONIC crystals

مستخلص: Inspired by the emerging field of twistronics, moiré photonic structures have attracted great interest. In this paper, we introduce the concept of the moiré Kagome lattice (MKL), which arises from the overlapping of a Kagome lattice at a commensurable angle of 38.211°. MKL exhibits a significantly broader main photonic bandgap (PBG) when compared to the traditional Kagome lattice. Through numerical simulations, we delved into the adjustable properties of the PBG of MKL by varying lattice parameters, including filling factors and materials. Meanwhile, we also observed the presence of photonic flatbands within the MKL structure. Specifically, the emergence of a super flat isolated flatband aids in achieving single-mode omnidirectional lasers and enhancing the omnidirectional electromagnetic interaction of materials, thereby expanding the applications of moiré photonic crystals. [ABSTRACT FROM AUTHOR]

المؤلفون: Raj, J. Immanuel Durai¹ (AUTHOR) immanuelje74@gmail.com, Durairaj, R. B.² (AUTHOR), Ananth, S. Vijay³ (AUTHOR), Meenakshisundaram, Nagaraj⁴ (AUTHOR)

المصدر: Environmental Quality Management. Jun2024, Vol. 33 Issue 4, p541-550. 10p.

مصطلحات موضوعية: FILLER materials, FLAX, FIBROUS composites, ELECTRONIC waste, NATURAL fibers, X-ray fluorescence, PRINTED circuits

مستخلص: The main aim of the present investigation is to fabricate waste printed circuit board (WPCB) particles and woven bidirectional flax fiber mat reinforced polymer matrix composite through a hand layup technique followed by vacuum bagging technique and examine its mechanical properties using the Universal Testing Machine (UTM), compression testing machine, and Shore D hardness tester. The WPCB particles with weight percentages of 0, 5, 10, 15, and 20 were used as reinforcement along with five layers of flax fiber mat to improve the adhesion behavior of epoxy resin with reinforcements and thereby improve the properties. The XRF (X‐ray fluorescence) investigation of the prepared WPCB particles confirmed the existence of various toxic elements in the processed printed circuit board (PCB). The scanning electron microscopy (SEM) analysis confirmed the presence of WPCB particles in the composite, along with flax fiber and resin. The tensile, compression, impact test shows that that the 15 wt.% WPCB particles reinforced flax fiber polymer composite gave betters properties, and the reduction of properties was seen thereafter. The percentage of water absorption increased with the weight percentage of the WPCB particles from 0% to 20%. Results indicate that the biodegradable flax fiber composites impregnated with WPCB filler can be utilized for many engineering and domestic applications. [ABSTRACT FROM AUTHOR]

: Copyright of Environmental Quality Management is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Kamil, Sara Mohammed¹ (AUTHOR) mae.20.59@grad.uotechnology.edu.iq, Dawood, Jamal Jalal¹ (AUTHOR) 130015@uotechnology.edu.iq, Al-Gebory, Layth¹ (AUTHOR) layth.w.ismael@uotechnology.edu.iq

المصدر: AIP Conference Proceedings. 2024, Vol. 3002 Issue 1, p1-15. 15p.

مصطلحات موضوعية: *DISSIMILAR welding, *FILLER materials, *STEEL alloys, *MICROSTRUCTURE, *FILLER metal, *ULTIMATE strength, *STEEL pipe

مستخلص: Welding boiler steam pipes is a challenging process due to the difficult working conditions in which high pressure and temperature values exist frequently. Thus, it is crucial to ensure an effective dissimilar welding process that enables perfect microstructure and good welding mechanical properties. This research is executed to examine the quality and effectiveness of steam boiler pipes used in large-scale thermal power plants. The work depends on investigating the mechanical features of dissimilar welding processes of T22/T91 steel alloy specimen. GTAW process is employed. Several welding verification tests were conducted. Relying on the experimental work and tests executed, the major work results revealed that the ultimate strength of the T22/T91 specimen when the filler material ERNiCr-3 is used reached 421 MPa for maximum elongation of 24%, and the hardness was 170 to 300 HV. While the specimen's ultimate strength amounted to 416 MPa for an elongation of 19% and the hardness ranged (193 to 322 HV) for the filler material ER90S-B3. In addition, it was found that the ultimate strength was 407 MPa for an elongation of 22% and the hardness ranged between 175 to 270 HV for the filler material ER90S-B9. Additionally, the T22/T91 specimen fracture took place at the base metal of T22 for both filler materials ERNiCr-3 and ER90S-B-3. At the same time, it occurred at the welded joint when the filler material ER90S-B9 was exploited. Findings also affirmed that carbon element migrated from T22 to T91 steel alloy, causing higher carbides concentration at the T91. This carbon migration could result in significant welding degradation and affect its reliability when the steel pipes are used frequently at higher temperature and pressure values. Moreover, the presence of delta ferrite that had a negative influence on tensile rupture strength and therefore are undesirable in these types of steels. [ABSTRACT FROM AUTHOR]

المؤلفون: Aristiyanto, Regia¹ (AUTHOR) regia@umy.ac.id

المصدر: AIP Conference Proceedings. 2024, Vol. 3127 Issue 1, p1-6. 6p.

مصطلحات موضوعية: *ENDODONTICS, *FILLER materials, *DENTAL pulp cavities, *GUTTA-percha, *ORGANIC solvents

مستخلص: Non-surgical endodontic retreatment is the first choice when previous endodontic treatment fails. Complete gutta-percha and sealer removal are required for successful retreatment. This study aims to present a review articles of the different techniques of gutta-percha removal associated with organic and non-organic solvents, to analyze the advantages and disadvantages of each technique, and investigate the third area of the root canal system that leaves the largest amount of remaining obturation material. The descriptors used were "gutta-percha removal", "retreatment," and "endodontic" in the following databases: ScienceDirect and PubMed. Publications of in vitro/ex vivo and in vivo experiments with English between 2011 and 2021 were selected. None of the retreatment techniques cleaned the root canal system completely. There was no significant difference between the manual and automated methods, even though the manual method requires a longer working time. Hereafter, solvent use did not statistically improve the removal of the obturation material. Furthermore, this review confirmed that the apical third of the root was the area with a greater accumulation of remnants of endodontic filling material. [ABSTRACT FROM AUTHOR]

المؤلفون: Wibowo, Ari^1,2 (AUTHOR), Alandro, Daffa² (AUTHOR), S. Killian, Manuela³ (AUTHOR), Nugroho, Gesang² (AUTHOR), N. V. Raghu, Swathi³ (AUTHOR), Akhsin Muflikhun, Muhammad² (AUTHOR) akhsin.muflikhun@ugm.ac.id

المصدر: Advanced Composite Materials. Feb2024, Vol. 33 Issue 1, p1-21. 21p.

مصطلحات موضوعية: *RAW materials, FILLER materials, BAGASSE, CELLULOSE, SUGARCANE, CELLULOSE fibers

مستخلص: Sugarcane bagasse–based raw materials are predominantly used for their low cost and ease of availability of cellulosic materials for biocomposite engineering. Herein, we use cellulose derived from bagasse to form microfibrillated cellulose (MFC). Unmodified MFCs were chemically characterized using FTIR and SEM-EDX analysis and later treated with the addition of filler materials, such as glass powder, air bubbles, and activated carbon, in order to enhance material properties. Sugarcane bagasse microfibrillated cellulose with added filler materials were subsequently evaluated with respect to their mechanical, structural, and chemical properties. The MFC was synthesized via a facile microfibrillation process enabled by a kitchen blender at ambient conditions. The as-formed MFC was thoroughly characterized chemically to identify any chemical compositional variations, especially those observed as a result of filler addition. Changes in mechanical properties of MFCs in the presence of individual filler materials were evaluated using tensile testing and are reported at a nearly comparable strength of ~3.63 MPa. The addition of filler materials resulted in the improvement of MFC such that the MFC was easily drawn into pliable sheets. The increased flexibility of the MFC offers a simple strategy to create bagasse-based disposable utensils that could promote sustainable and eco-friendly commodities. [ABSTRACT FROM AUTHOR]

: Copyright of Advanced Composite Materials is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Fidan, Sinan¹, Korkusuz, Orkan Baran² baran.korkusuz@kocaeli.edu.tr, Toker, Pelin Özzaim², Gültürk, Elif², Ateş, Bülent Hayri³, Sınmazçelik, Tamer²

المصدر: Polymer Composites. Jun2024, p1. 17p. 12 Illustrations, 5 Charts.

مصطلحات موضوعية: *FILLER materials, *POLYTEF, *FRETTING corrosion, *SLIDING wear, *WEAR resistance, *SOLID lubricants

مستخلص: Highlights As it is known, Polytetrafluoroethylene (PTFE) is one of the most preferred polymeric materials for tribological applications. This study investigates the performance of PTFE and its composites under different tribological conditions. The effects of short glass fiber (GF), carbon particle (CP) and bronze particle (BP) reinforcement agents and their hybrid filling with molybdenum disulfide (MoS2) on sliding, erosive and abrasive wear were examined. Sliding tests were carried out with a ball‐on‐disc test apparatus, erosive wear tests were carried out with solid particle erosion and abrasive wear tests were carried out with a scratch test. It has been found that reinforcement agents improve sliding and abrasive wear resistance but worsen the erosion resistance. The hardness and contact angle of the samples were associated with their wear performances. Topographic and morphological analyzes of worn surfaces were performed using optical profilometer and scanning electron microscopy (SEM), respectively, and wear mechanisms were discussed. Filling materials (glass fiber, carbon particle and bronze particle) increase the adhesion and abrasion resistance of PTFE, while decreasing its erosion resistance. The effect of hybrid addition of MoS2 solid lubricant on wear performances depends on the type of filler. There is a correlation between surface properties (hardness and contact angle) and wear performances. Optical profilometer and scanning electron microscopy were used to examine wear mechanisms. [ABSTRACT FROM AUTHOR]

المؤلفون: Benhalilou, Mohammed Ichem¹, Abdelouahed, Assia² abdelouahedassia@yahoo.fr, Hebhoub, Houria², Kechkar, Chiraz³, Hamid, Alsayadi²

المصدر: Journal of Composite & Advanced Materials / Revue des Composites et des Matériaux Avancés. Jun2024, Vol. 34 Issue 3, p295-303. 9p.

مصطلحات موضوعية: *MORTAR, *FILLER materials, *CONCRETE waste, *CONCRETE blocks, *NATURAL fibers, *MINERAL aggregates

مصطلحات جغرافية: ALGERIA

مستخلص: As a fact of matter, the aim of this paper is to produce a new ecological mortar based on recycled aggregates from hollow concrete blocks waste and reinforced with natural Diss fibers for use in manufacturing filling materials and masonry blocks, for the purpose of reducing the impact of such waste on the environment on the one hand, and making the most of the Diss plant, which is abundant in Algeria, on the other. In virtue of which, for achievement purpose of this work, we partially substituted the crushed-stones sand (CS) of a mortar reinforced with Diss fibers with recycled sand (RS) from hollow concrete blocks waste at rates of 15%, 30% and 50%. Besides, the produced mortars were subjected to density, consistency and air occlusion tests in their fresh state; moreover, they have alike been subject to compressive strength, flexural tensile strength, water absorption by immersion and capillary action, chemical resistance to acid and alkali, and chloride ion penetration tests in the hardened state. As consequence, the results illustrated improvements in consistency, mechanical strength and resistance to chemical attacks, with a slight increase in chloride ion penetration. [ABSTRACT FROM AUTHOR]

المؤلفون: Hu, Jun¹ (AUTHOR), Dong, Wenyu¹ (AUTHOR), Xia, Zhiguo^2,3 (AUTHOR) xzgyy88@163.com, Chen, Bing⁴ (AUTHOR), Jiang, Tianqi⁵ (AUTHOR), Yang, Yuhao¹ (AUTHOR)

المصدر: Physics of Fluids. Jun2024, Vol. 36 Issue 6, p1-19. 19p.

مصطلحات موضوعية: *MECHANICAL behavior of materials, *FILLER materials, *SANDSTONE, *ACOUSTIC emission, *STRESS concentration, *ROCK deformation

مستخلص: Fissured rocks deteriorate with increasing water content, and the mechanical behavior is significantly influenced by the filling materials within their fissures. Understanding the effects of tailings water on the mechanical properties and failure modes of rocks under different filling conditions is crucial for assessing the stability of tailings ponds. In this study, uniaxial compression tests were conducted on single-fissured sandstone filled with gypsum, cement, and epoxy resin at various immersion heights, and acoustic emission signals were monitored. The results indicate that the mechanical properties of sandstone deteriorate significantly upon immersion, but the rate of deterioration decreases with increasing immersion height. The use of stronger and more cohesive filling materials can improve the mechanical properties of fissured sandstone, but there remains a gap compared to intact samples. Differences in physical properties and uneven stress distribution between immersed and dry portions lead to the formation of complex crack networks in partially immersed samples. The strong bonding between epoxy resin and sandstone results in local stress exceeding the sandstone's bearing limit, leading to increased fragmentation. The acoustic emission activity generally exhibits a pattern of gradual increase, quiescence, and then activation. As the immersion height increases, the number of acoustic emission events and energy release decrease. The average frequency and rise angle analysis reveals that tensile cracks dominate the failure process. Near failure, the b-value drops sharply and exhibits intense fluctuations, accompanied by the emergence of numerous high-frequency signals. These phenomena provide a basis for predicting rock instability and failure. [ABSTRACT FROM AUTHOR]

المؤلفون: Yang, Bo^1,2 (AUTHOR) yangbo@kangwon.ac.kr, Liu, Yao^1,2 (AUTHOR) lyknu@kangwon.ac.kr, Wang, Xiao-Yong^1,2 (AUTHOR) lyknu@kangwon.ac.kr

المصدر: Materials (1996-1944). Jun2024, Vol. 17 Issue 11, p2769. 15p.

مصطلحات موضوعية: *FILLER materials, *HEAT of hydration, *POWDERS, *CONCRETE, *HYDRATION, *PORTLAND cement, *QUARTZ

مستخلص: Although quartz powder is a common concrete filling material, the importance and originality of this study lies in the development of a hydration model for quartz powder–cement binary mixtures and the adoption of this model to predict the development of concrete material properties. The purpose of this study is to use this model to promote the material design of environmentally friendly concrete and to elucidate the relationships in the development of the various properties of quartz powder concrete. The method used in this study was as follows: The parameters of the hydration model were obtained through seven days of hydration heat experiments. The hydration heat up to 28 days was also calculated, and the various properties of the concrete were predicted from the heat of hydration. The main findings of this study were as follows: (1) The ultimate hydration heat released per gram of cement for the different quartz powder substitution rates and quartz powder particle fineness was the same, at 390.145 J/g cement, as was the shape index of the hydration model at −1.003. (2) Moreover, through the model calculations, we found that, at the twenty-eighth day of the curing period for the quartz powder specimens with different quartz powder substitution amounts and different fineness, the reaction level of the cement was similar, at 0.963, as were the values of the cumulative heat of hydration, with both at 375.5 J/g cement. (3) The model showed that, in the late stage (28 days) of hydration for quartz powders of different fineness and when the substitution amount was the same, the cumulative heat of hydration over 28 days was similar. (4) The properties of concrete were evaluated using the calculated hydration heat. Overall, the predictive performance of the power and linear functions was similar, with no significant differences being found. [ABSTRACT FROM AUTHOR]

المؤلفون: Körmöczi, Andor¹ (AUTHOR) kandor@titan.physx.u-szeged.hu, Horváth, Gábor¹ (AUTHOR), Szörényi, Tamás¹ (AUTHOR) t.szorenyi@physx.u-szeged.hu, Geretovszky, Zsolt¹ (AUTHOR)

المصدر: Materials (1996-1944). Jun2024, Vol. 17 Issue 11, p2736. 16p.

مصطلحات موضوعية: *FILLER materials, *ELECTRICAL steel, *ENERGY density, *FINITE element method, *SHEET-steel, *BATTERY industry

مستخلص: The electric vehicle (EV) industry challenges battery joining technologies by requiring higher energy density both by mass and volume. Improving the energy density via new battery chemistry would be the holy grail but is seriously hindered and progresses slowly. In the meantime, alternative ways, such as implementing more efficient cell packaging by minimising the electrical resistance of joints, are of primary focus. In this paper, we discuss the challenges associated with the electrical characterisation of laser-soldered joints in general, and the minimisation of their resistive losses, in particular. In order to assess the impact of joint resistance on the overall resistance of the sample, the alteration in resistance was monitored as a function of voltage probe distance and modelled by finite element simulation. The experimental measurements showed two different regimes: one far from the joint area and another in its vicinity and within the joint cross-section. The presented results confirm the importance of the thickness of the filler material, the effective and total soldered area, and the area and position of the voids within the total soldered area in determining the electrical resistance of joints. [ABSTRACT FROM AUTHOR]