Composite Technique Research Articles

Забавные народные истории об умниках Южного Вьетнама: развитие и особенности жанра

The article presents a relatively new genre of South Vietnamese folk funny stories about wise men called "truyen trang", which is literally translated from Vietnamese as tales about wise folk wits, and has not yet been sufficiently studied by Vietnamese folklorists. The author explores South Vietnamese tales about a birdcatcher named O from Ben Tre province (26 tales) and tales about Uncle Ba Phi from the Ca Mau region, which is located in the extreme south of Vietnam (54 tales). Their typical plot structures, basic techniques of composition and organization of artistic space are explored. A comparative analysis of Chuyen Trang tales with similar tales from the northern and other regions of Vietnam is carried out. This article is the first step towards getting acquainted with the genre of funny stories about truyen trang smart guys, which became widespread in South Vietnam. For the first time, it examines the history of the emergence of this genre, its development and features.

Resistance Welding of Thermoplastic Composites, Including Welding to Thermosets and Metals: A Review.

This review paper presents the current progress in the development of resistance welding techniques for thermoplastic composites, with a particular emphasis on their application in hybrid joints, such as those involving thermosetting composites and metals. Resistance welding, a fusion bonding method, offers significant advantages over adhesive bonding and mechanical joining by eliminating the need for additional adhesive materials and enabling integration into automated manufacturing processes. The study highlights the unique benefits of resistance welding, including lower energy consumption compared to other methods and its compatibility with automated manufacturing, which can reduce production costs by up to 40%. Key findings from the literature indicate that resistance welding is particularly effective in achieving strong, durable joints for complex and large structures, such as those used in the aerospace industry. The review also identifies the main challenges associated with resistance welding, including temperature control, current leakage in carbon-fiber-reinforced polymers, and potential corrosion when using metal meshes. To address these challenges, various strategies are discussed, including surface treatments, the use of nanocomposites, and the integration of carbon nanotubes. The review concludes by emphasizing the need for further research to optimize welding parameters and to develop non-destructive testing methods for industrial applications, ensuring the reliability and long-term performance of welded joints.

Study of the Techniques of Akira Nishimura’s String Quartet No.2 <Pulse of the Lights>

String Quartet No.2 Pulse of the Lights was composed by Akira Nishimura in 1992. This piece is a representative work from the composer’s mature period, fully showcasing his personalized compositional techniques. It holds significant analytical value and influence. This paper explores how Nishimura organically blends Eastern folk elements with Western musical culture by analyzing the pitch organization, core materials, musical structure, and unique compositional techniques in the work. It also examines how he embeds his distinctive compositional methods within the materials and integrates them throughout the structure.

Assessing the pedagogical effectiveness of the web-based cooperative integrated reading composition (CIRC) technique to enhance EFL reading comprehension skills

Assessing the pedagogical effectiveness of the web-based cooperative integrated reading composition (CIRC) technique to enhance EFL reading comprehension skills

Beyond the panel: cinematism and affective responses in Itō Junji’s Tomie

ABSTRACT Itō Junji has been a renowned horror author since his work Tomie was released in the late 1980s. Tomie tells the story of an eponymous vengeful entity who, after being killed by her classmates on a school trip, leads men she encounters to madness and to her assassination which leads to her multiplying and being reborn again. Previous studies have focused on gender-based readings of the violence and body-horror elements in Tomie, yet little attention has been given to how this latter works in tandem with other elements as affective devices. By drawing upon several concepts related to affect, this paper analyzes the use of horror manga to evoke affective and somatic responses in readers. It shows that the manga’s use of panelling and composition techniques associated with cinema plays an essential role in the creation of dread and anticipation. Additionally, the exploration of abjection and body horror reveals how these contribute to the reader’s responses which oscillate between sympathy and somatic empathy. Ultimately, this study highlights how horror manga, as a visual medium with cinematic traits, can elicit responses in readers similar to horror cinema and offers a potential theoretical framework for the broader study of horror manga.

(Re) Examining the Functions of Dùndún Talking Drum in the Inter-Cultural Music Process of Africa and the African Diaspora

Whenever the hourglass-shaped drum 'Dùndún' is mentioned, minds of music scholars readily go to the hourglass-talking drum of the Yorùbá-speaking people of West Africa. However, this does not mean that this musical instrument is peculiar to the Yorùbá as its distribution- in its varied forms- across West Africa is general; covering an area stretching roughly from Senegal to the Cameroun Republic1. This talking drum's compositional and performance techniques have become highly specialized and standardized because of its high usage in both the social and religious celebrations of the Yorùbá. This paper focuses on the use of Dùndún to perform other sonic functions beyond Yorùbá speech melodies and oral poetry. Intercultural music theory, being used in this study has shown that the prospect of Dùndún talking drum usage within the context of diasporic music performances proffers greater potential for the instrument as it has been favourably utilized by internationally renowned musicians in contemporary popular music both within and outside the shores of Africa. Furthermore, that interested musicians in the diaspora will find this instrument useful for their subsequent compositions and performances will help redefine the socio-cultural worldview of the music of Africa.

Evaluation of pulp chamber temperature during cementation with the preheated composite resin technique

The cementation technique using preheated composite resin requires high temperatures for optimal execution and may lead to increased and damaging intrapulpal temperatures. Whether the technique can lead to a temperature increase that might lead to necrosis of the pulp tissue is unclear. The purpose of this in vitro study was to evaluate the temperature variation in the pulp chamber of bovine teeth with veneer-type preparations during veneer cementation using the preheated composite resin technique. A total of 103 bovine incisors were divided into 8 groups (n=10) and prepared for indirect veneers with different preparation depths: 2.0mm, 1.5mm, 1.0mm, and 0.5mm. Veneers were cemented on these preparations using 2 cementation protocols: preheated composite resin and photopolymerizable resin cement. The teeth were attached to a device containing a temperature sensor which was inserted into the pulp chamber to quantify the intrapulpal temperature variation produced during the cementation protocols. The data were analyzed using a statistical software program. The level of statistical significance for the analyses was with a confidence interval of 95%, sampling power of 80%, and a moderate effect size (0.36). The groups cemented with preheated composite resin and the groups with the greatest preparation depth had the highest mean intrapulpal temperature; the PHC2 group presented a mean ±standard deviation temperature increase of 5.70 ±2.14°C. The heat generated by heating the resin contributed to the increase in intrapulpal temperature. Temperature variations were greater in deeper preparations, especially when preheated resin technique was used.

Evaluation of stress distribution in restorations of maxillary central incisor with post-traumatic enamel-dentin fracture using two different techniques: A micro-computed tomography study

Aim: The aim of this study is to investigate the stress distribution created by two restorative techniques, adhesive reattachment of the fractured fragment and direct composite restoration, used in the treatment of a maxillary central incisor with enamel-dentin fracture. The analysis is conducted using the finite element stress analysis method on a three-dimensional (3D) model prepared based on micro-computed tomography data, following the application of different adhesive procedures on fractured teeth. Methodology: The avulsed left maxillary central incisor was scanned using a micro-computed tomography device. The obtained data was transferred to a computer and used for 3D modeling. In the models, a fracture line was created obliquely at a 45° angle, 3 mm away from the mesial surface towards the distoincisal corner of the tooth. Six restorations were planned on this model: three direct composite restorations and three adhesives, reattachments followed by composite application. The models for the adhesive reattachment method included: (1) internal dentin groove, (2) palatal composite laminate veneer, and (3) double palatal retentive groove. The models for the composite restoration technique included: (1) composite laminate veneer, (2) direct composite restoration following enamel beveling, and (3) composite application after double palatal groove preparation. Upon completion of the restorations, a 100-N force was applied from the palatal direction using the finite element stress analysis method. The results were analyzed to examine the amount and distribution of stress on the restorations and the tooth. Results: In all models, the highest stress values within tooth structures were observed in the enamel. The lowest stress value in the enamel layer was seen in model R-1, whereas the highest stress value was observed in model K-2. For direct composite restorations, the stresses on enamel, dentin, and restoration were relatively similar in each model, with no significant differences noted among these values. Among all applied composite restorations, the lowest stress value was observed in model R-3. When analyzing the stresses generated at the tooth-restoration and tooth-fractured fragment interface of the six models, the lowest stress in the enamel was observed in models R-1 and K-3, while the highest stress was seen in model R-3. Conclusion: According to the data obtained from the models, the shape of the restoration applied on the tooth, the technique used, and the location of the restoration affect the amount and distribution of stress accumulated in the tooth and restoration. However, the stress analysis results are not sufficient to evaluate the clinical success of restorations. There is a need for further studies utilizing different techniques to support the models used. How to cite this article: Olgaç Akgönül Ş, Çelenk S, Adıgüzel Ö. Evaluation of stress distribution in restorations of maxillary central incisor with post-traumatic enamel-dentin fracture using two different techniques: A finite element analysis based on micro-computed tomography data. Int Dent Res 2024;14(2):76-83. https://doi.org/10.5577/intdentres.535

Enhancing digital marketing of MSMEs through comprehensive photography training in Hendrosari Village, Gresik

MSMEs in Hendrosari Village have been struggling with digital marketing due to a lack of expertise in creating compelling visual content, which has led to poor online visibility and stagnating sales. Additionally, these businesses face challenges in keeping up with ever-evolving digital trends, limited access to affordable digital tools, and insufficient training opportunities, further hampering their ability to compete in a growing online marketplace. An extensive photography training program was launched, aimed at equipping 15 MSMEs in Hendrosari Village, the target groups of this service initiative, with essential skills in lighting, composition, and post-processing techniques. This program aims to enhance their visual content creation capabilities, helping them improve their online presence and market competitiveness. The program combined theoretical lessons with hands-on practice, allowing participants to immediately apply what they learned. The community service team conducted observations and interviews before and after the training to assess changes in product photo quality and the impact on sales. The average photo quality assessment score increased from 3 to 4.5. In addition, some participants reported a 15 percent increase in income after learning new photography techniques. Based on the evaluation process, it shows that the photography training has strong potential to improve the competitiveness of MSMEs in Hendrosari village, which can inspire similar programs in other areas.

Research on Application of Composite Facades for Civilian Reconstruction of Industrial Heritage in Cold Regions Based on Thermal Buffering Effect

Previous studies on the civil transformation of industrial heritage have been conducted mainly from the perspective of architectural history, culture and aesthetics, but rarely focus on energy-saving and the comfort of the new users. Most industrial heritage facades are of high conservation value, but efforts to preserve the authenticity of the facade can lead to the application of limited energy-saving technologies, ultimately resulting in poor indoor thermal environments. Therefore, it is valuable to research how to solve the contradiction between protecting the authenticity of the preserved facades of industrial heritage and improving the indoor environmental performance. This paper proposes two composite facade application strategies based on thermal buffer effects, takes two composite facades renovation methods of Shenyang Dongmao No. 2 Warehouse as an example, utilizes the natural environmental resources to enhance the spatial quality of industrial heritage. With the help of DesignBuilder software modelling simulation analysis, in-depth comparative analysis of the two types of composite facades on the indoor thermal environment of the industrial heritage of the impact and scope. Key findings show that the application of two different composite facade retrofitting techniques not only protects the skin texture of the wall, but also effectively increases the indoor temperature and reduces the indoor energy consumption of the industrial heritage. The composite facade of the external solid wall and the internal glass is more stable in raising the indoor temperature, more effective in reducing the building energy consumption, and more suitable for the civilian transformation of industrial heritage in cold areas. The research findings provide reference for studies on the civil transformation of industrial heritage, and serve as technical references for architects.

Longitudinal Imaging of Injured Spinal Cord Myelin and White Matter with 3D Ultrashort Echo Time Magnetization Transfer (UTE-MT) and Diffusion MRI.

Quantitative MRI techniques could be helpful to noninvasively and longitudinally monitor dynamic changes in spinal cord white matter following injury, but imaging and postprocessing techniques in small animals remain lacking. Unilateral C5 hemisection lesions were created in a rat model, and ultrashort echo time magnetization transfer (UTE-MT) and diffusion-weighted sequences were used for imaging following injury. Magnetization transfer ratio (MTR) measurements and preferential diffusion along the longitudinal axis of the spinal cord were calculated as fractional anisotropy or an apparent diffusion coefficient ratio over transverse directions. The area of myelinated white matter was obtained by thresholding the spinal cord using mean MTR or diffusion ratio values from the contralesional side of the spinal cord. A decrease in white matter areas was observed on the ipsilesional side caudal to the lesions, which is consistent with known myelin and axonal changes following spinal cord injury. The myelinated white matter area obtained through the UTE-MT technique and the white matter area obtained through diffusion imaging techniques showed better performance to distinguish evolution after injury (AUCs > 0.94, p < 0.001) than the mean MTR (AUC = 0.74, p = 0.01) or ADC ratio (AUC = 0.68, p = 0.05) values themselves. Immunostaining for myelin basic protein (MBP) and neurofilament protein NF200 (NF200) showed atrophy and axonal degeneration, confirming the MRI results. These compositional and microstructural MRI techniques may be used to detect demyelination or remyelination in the spinal cord after spinal cord injury.

IA-Body Composition CT at T12 in Idiopathic Pulmonary Fibrosis: Diagnosing Sarcopenia and Correlating with Other Morphofunctional Assessment Techniques.

Body composition (BC) techniques, including bioelectrical impedance analysis (BIVA), nutritional ultrasound® (NU), and computed tomography (CT), can detect nutritional diagnoses such as sarcopenia (Sc). Sc in idiopathic pulmonary fibrosis (IPF) is associated with greater severity and lower survival. Our aim was to explore the correlation of BIVA, NU and functional parameters with BC at T12 level CT scans in patients with IPF but also its relationship with degree of Sc, malnutrition and mortality. This bicentric cross-sectional study included 60 IPF patients (85.2% male, 70.9 ± 7.8 years). Morphofunctional assessment (MFA) techniques included BIVA, NU, CT at T12 level (T12-CT), handgrip strength, and timed up and go. CT data were obtained using FocusedON®. Statistical analysis was conducted using JAMOVI version 2.3.22 to determine the cutoff points for Sc in T12-CT and to analyze correlations with other MFA techniques. the cutoff for muscle area in T12-CT was ≤77.44 cm2 (area under the curve (AUC) = 0.734, sensitivity = 41.7%, specificity = 100%). The skeletal muscle index (SMI_T12CT) cutoff was ≤24.5 cm2/m2 (AUC = 0.689, sensitivity = 66.7%, specificity = 66.7%). Low SMI_T12CT exhibited significantly reduced median survival and higher risk of mortality compared to those with normal muscle mass (SMI cut off ≥ 28.8 cm/m2). SMI_T12CT was highly correlated with body cell mass from BIVA (r = 0.681) and rectus femoris cross-sectional area (RF-CSA) from NU (r = 0.599). Cronbach's α for muscle parameters across different MFA techniques and CT was 0.735, confirming their validity for evaluating muscle composition. T12-CT scan is a reliable technique for measuring low muscle mass in patients with IPF, specifically when the L3 vertebrae are not captured. An SMI value of <28.8 is a good predictor of low lean mass and 12-month mortality in IPF patients.

Flexural behavior of reinforced concrete beams externally strengthened with ECC and FRP grid reinforcement

To prevent premature delamination of FRP sheets in strengthened concrete structures, this study explores a novel method of laying a composite layer of fiber reinforced polymer (FRP) grid reinforced with engineering cementitious composite (ECC), designated as FGRE, and applied at the soffit of reinforced concrete (RC) beams to improve its flexural performance. Experimental studies were conducted on RC beams with different strengthening configurations to validate the effectiveness of the proposed strengthening method. In addition, analysis on the working mechanism and a parametric analysis were performed for the composite strengthened beam using nonlinear finite element modeling. The experimental results showed that FGRE composite layers can significantly improve the bearing capacity of RC beams. Compared with the control RC beam, the FGRE composite strengthening technique significantly increased the cracking load, yield load, and ultimate load of the beam specimens up to 28, 11, and 12 %, respectively. The ECC grout layer maintained a good bonding performance with the concrete substrate until beam failure. The flexural capacity of RC beams with the proposed FGRE strengthening systems is determined by the thickness of the ECC layer. In addition, the effect of strengthening on the flexural capacity was more significant when the yield and tensile strength of the steel reinforcement were lower. Moreover, the prediction deviation from the experimental data of the FE models and analytical models for the ultimate load-bearing capacity were less than 2 and 7 %, respectively. It can be concluded that the proposed FGRE system is a viable solution to enhance the flexural capacity of RC beams.

Effect of grain morphology and interface on the toughness of nacre-like aluminas

Ceramic composites that are both tough and strong are needed for extreme environments, ranging from aerospace and nuclear, to medical applications. Bioinspired ceramic composites tackle this challenge by mimicking tough natural structures. Nacre-like aluminas (NLAs) are ceramics processed using advanced colloidal techniques to obtain a microstructure resembling the brick-and-mortar structure of nacre. NLAs can achieve flexural strengths up to 600 MPa and fracture toughnesses ranging from 5 MPa.m1/2 up to 16 MPa.m1/2 after crack propagation. These high values mainly rely on deflection mechanisms; these can operate at temperatures up to 1200°C and under impact testing. The fracture properties have been found to be highly dependent on the mortar composition and processing technique used. However, we still don't know how far we can extend the structural properties of NLAs by changing their mortar strength and brick morphology. In this study, we combine mode I wedge splitting testing and in situ synchrotron X-ray microtomography of mixed-mode SENB fracture testing along with a kinked crack analytical formulation to study the microstructure-properties relationship in NLAs having two mortar compositions/morphologies. We compare the toughness values obtained in mode I and II with deflection models and study the effect of mode-mixity on the NLA toughness. Our findings show the grain morphology strongly influences the fracture behaviour, with the longer grain material showing longer stable crack deflection which could be further optimised going forwards. By contrast the mortar properties which provide deflection and local toughening mechanisms may be nearing their optimal strength.

Application of 2-D Molybdenum Disulfide in the Field of Photoelectric Detection

The research of photodetectors is rooted in the principle of photoelectric effect, which has become indispensable in human society. Photodetectors convert light signals into electrical signals and represent a crucial subdivision within modern optoelectronic technology. They play significant roles in optical communications, remote sensing, biomedical applications, industrial automation, and more. Two-dimensional MoS&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; has attracted considerable attention in optoelectronics due to its unique structure and performance characteristics. The research methods for photodetectors primarily include: Material Selection: Using semiconductor materials such as silicon, germanium, gallium arsenide, and indium arsenide. Silicon, in particular, is widely applied in optical communications, computer networks, medical diagnostics, and more. Technological Improvements: This involves high sensitivity detection techniques, automatic alignment technologies, and composite integration techniques to enhance the performance and application domains of photodetectors. Application Development: Exploring new applications of photodetectors in optical communications, medical imaging, security monitoring, etc., and improving their reliability and efficiency in practical applications.Research on photodetectors not only enhances their efficiency and performance in fields like communication, medicine, and security monitoring but also lays a solid foundation for future technological innovation and application expansion. With continuous advancements in technology, photodetectors are demonstrating vast application prospects and substantial market potential. Finally, the prospects and challenges associated with photodetectors in practical applications are also discussed.

Current research status and application prospects of permeability and mechanical properties of pervious concrete

Permeable concrete, characterized by continuous porosity, offers excellent properties such as breathability, water permeability, sound absorption, water purification, and environmental enhancement. This paper comprehensively reviews previous research on permeable concrete, encompassing studies on mix design, workability, mechanical properties, drainage performance, sound absorption, and durability. It also discusses improvement measures and application prospects. Research indicates that the performance of permeable concrete is influenced by factors such as mix design, material composition, and construction techniques. Optimizing mix design, modifying material composition, and enhancing workability and mechanical properties can further improve the performance of permeable concrete. Permeable concrete shows broad application prospects in road engineering, landscaping, and environmental engineering, but further research and standardization are needed to support its widespread adoption.

Siam folk tune “Lanna” for string orchestra

This article discusses the compositional materials and process of “Lanna” for string orchestra based on folk tunes from Northern Thailand (Lanna). The composition comprises 6 movements for a duration of 50 minutes. The composer carefully selected folk tunes and rendered a balance between the borrowed ones and the newly composed materials through the careful mix of musical elements, including keys, melodies, rhythmic patterns, idioms, and re-created the sound to imitate the performance techniques of the original instruments. Certain Western compositional techniques were adapted to fit the original melodies in order to retain the identity of the work and provide a balanced blend of the original Eastern and the new Western melodies, thereby creating a new perspective of sound as well as an inspiration for other composers to continue crafting music in this genre. Traditional Lanna tunes, including Fon Phang, Pan Fai, Noi Chai Ya, and Lao Duang Dokmai are presented partly in multi movements to convey traditional melodies. Imitations of certain singing and playing techniques are also transcribed via selections of instruments in the ensemble, especially the violin solo, to portray both the authentic Lanna atmosphere and the blend of the two cultures.

Design optimization of lightweight automotive seatback through additive manufacturing compression overmolding of metal polymer composites

With the growing demand for enhanced automotive fuel efficiency and environmental sustainability, there is a need for lightweighting automotive components through innovative design and manufacturing processes. This study leverages a combination of numerical iterative design optimization and hybrid additive manufacturing–compression molding (AM-CM) technique for metal polymer composites to lightweight an automotive seatback. The AM-CM process enables robust mechanical interlocking between metals and composites, boasting high stiffness and strength with low overall density. Replacing metallic components with such metal polymer composites allows for comparable mechanical performance while significantly reducing the overall weight. First, the automotive seatback design space is reduced to critical load carrying regions using topology optimization and high stress concentration areas are identified using finite element analysis. Next, a lightweight metal polymer subcomponent is designed for a high stress concentration region. The full seatback frame with spatially heterogeneous material-specific design is then iteratively optimized to enable enhanced stiffness with minimal weight. Overall, the automotive seatback frame designed with location-specific metal, polymer, and metal polymer composite materials weighs 20% less than the metal-only design while exhibiting similar stiffness.

Study on the microstructure, recrystallization, and mechanical properties of hot-press sintered (TiC + B4C)/6061Al composites during hot rolling

Hot rolling is a vital secondary processing technique for aluminum matrix composites. To explore the forming mechanism of (TiC+B4C)/6061Al composites during hot rolling, the 6061Al and (TiC+B4C)/6061Al composites were fabricated via vacuum hot-press sintering followed by hot rolling. The results show that reinforcing particles changed the distribution of Si and resulted in the in-situ generation of SiC in hot-rolled (TiC+B4C)/6061Al composites. During hot rolling, reinforcing particles inhibited the elongation and refined the size of Al grains, and contributed to further enhancing the hardness and strength of hot-rolled 6061Al. With the hot rolling reduction rate increasing, the hardness and strength of hot-rolled (TiC+B4C)/6061Al composites improved, and the refinement effect of reinforcing particles intensified. Both reinforcing particles and hot rolling exhibited effects on the recrystallization behavior of 6061Al during hot rolling, primarily through particle induced nucleation mechanism and strain induced grain boundary migration mechanism. Remarkably, the strength achieved by hot-rolled (TiC+B4C)/6061Al composites at a 20% hot rolling reduction rate rivals that of hot-rolled 6061Al at an 80% hot rolling reduction rate, while still preserving high plasticity. Hot-rolled (TiC+B4C)/6061Al composites predominantly exhibited the ductile fracture of aluminum matrix and cleavage fracture of particles, and the ductile fracture characteristics gradually weakened with the hot rolling reduction rate increasing. The dislocation increment strengthening mechanism contributed the most to the strength improvement of hot-rolled (TiC+B4C)/6061Al composites. This study can provide valuable insights into aluminum matrix composites.

Optimization of Cyanide-Free Composite Electrodeposition Based on π-π Interactions Preparation of Silver-Graphene Composite Coatings for Electrical Contact Materials.

With the rapid development of industrial automation and power electronics, the requirements for electrical contact materials are increasing. However, traditional electrical contact materials encountered significant bottlenecks in terms of performance enhancement and production environmental friendliness. Therefore, this paper proposes a new material design idea that utilizes π-π interactions between graphene and compounds with conjugated structures in order to achieve uniform dispersion of graphene in the metal matrix and thus enhance the performance of composites. Based on this design idea, we used nicotinic acid, which has a conjugated structure and is safe, as the complexing agent, and successfully prepared high-quality silver-graphene (Ag-G) composite coatings with graphene uniformly dispersed in the metal matrix on copper substrates by composite electrodeposition technique. Subsequently, the mechanical properties of composite coatings were investigated by hardness test and X-ray diffractometer, and the tribological properties of the composite coatings and the comprehensive performance under the current carrying conditions were systematically evaluated by using friction and wear tester and load key life tester. The results show that the Ag-G composite coatings have significant advantages in mechanical, tribological, and current carrying conditions. This result not only verifies the feasibility of the design idea of the material, but also provides a new direction for the research and development of electrical contact materials.