Academic literature on the topic 'TFMLs'
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Journal articles on the topic "TFMLs"
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Zeng, Yan, Chunguang Li, Hong Zheng, and Yijun Liu. "Ballistic Performance of Thermoplastic Fiber-Reinforced Metal Laminates Subjected to Impact Loadings." Applied Sciences 14, no. 20 (2024): 9157. http://dx.doi.org/10.3390/app14209157.
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This paper aims to predict the damage and fracture behavior of thermoplastic fiber-reinforced metal laminates (TFMLs) under ballistic impact loadings. A dynamic metal constitutive model has been employed and implemented in Abaqus/Explicit through a vectorized user material subroutine (VUMAT). The effects of the Lode angle, temperature, and strain rate are considered in the strength model, while the effects of stress triaxiality, Lode angle, temperature, and strain rate are taken into account in the failure criteria. To assess the validity and superiority of the proposed model, the numerically predicted responses of polypropylene fiber-reinforced metal laminates subjected to varying impact energies were systematically compared with corresponding experimental results. Additionally, a comparative analysis was performed between the numerical simulation results predicted by the present model and those obtained using other constitutive models, such as the Johnson–Cook (JC) constitutive model and the elastoplastic constitutive model. Furthermore, the effect of projectile types on the ballistic performance of TFMLs have been systematically investigated. The findings demonstrate that the failure pattern predicted by the current model closely aligns with the experimental observations, while both the Johnson–Cook (JC) constitutive model and the elastoplastic constitutive model were unable to accurately replicate the experimentally observed failure behavior. This study also reveals that the projectile’s nose shape plays a significant role in influencing the perforation behavior of TFMLs, affecting both the residual velocity and damage.
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Sakurai, Junpei, and Seiichi Hata. "Characteristics of Ti-Ni-Zr Thin Film Metallic Glasses / Thin Film Shape Memory Alloys for Micro Actuators with Three-Dimensional Structures." International Journal of Automation Technology 9, no. 6 (2015): 662–67. http://dx.doi.org/10.20965/ijat.2015.p0662.
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In this paper, we investigate the characteristics of Ti-Ni-Zr thin film metallic glasses (TFMGs)/ shape memory alloys (SMAs) for microelectromechanical systems (MEMS) applications with three-dimensional structures. The amorphous Ti-Ni-Zr thin films having a Ni content of more than 50 at.% and Zr content of more than 11 at.% undergo glass transitions and are TFMGs. The Ti39Ni50Zr11TFMG has the lowest glass transition temperatureTgof 703 K and a wide supercooled liquid region ΔTof 57 K. Moreover, it has high thermal stability atTg. However, the apparent viscosity of the Ti39Ni50Zr11is higher than those of other Ti-Ni-Zr TFMGs. Moreover, the Ti-Ni-Zr TFMG exhibits higher viscosity than conventional TFMGs because the alloy composition of Ti-Ni-Zr TFMGs/SMAs is far from the eutectic point.
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Ballestín-Bernad, Víctor, Jesús Sergio Artal-Sevil, and José Antonio Domínguez-Navarro. "A Review of Transverse Flux Machines Topologies and Design." Energies 14, no. 21 (2021): 7173. http://dx.doi.org/10.3390/en14217173.
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High torque and power density are unique merits of transverse flux machines (TFMs). TFMs are particularly suitable for use in direct-drive systems, that is, those power systems with no gearbox between the electric machine and the prime mover or load. Variable speed wind turbines and in-wheel traction seem to be great-potential applications for TFMs. Nevertheless, the cogging torque, efficiency, power factor and manufacturing of TFMs should still be improved. In this paper, a comprehensive review of TFMs topologies and design is made, dealing with TFM applications, topologies, operation, design and modeling.
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Min, Jun-Hong, Shin-Hyuk Kang, Jang-Bo Lee, Tai-Hyoung Cho, and Jung-Guen Suh. "Anatomic Analysis of the Transforaminal Ligament in the Lumbar Intervertebral Foramen." Operative Neurosurgery 57, suppl_1 (2005): 37–41. http://dx.doi.org/10.1227/01.neu.0000163481.58673.1a.
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Abstract OBJECTIVE: The objective of this study was to evaluate the clinical significance of the transforaminal ligaments (TFLs) in relation to the area of the lumbar intervertebral foramen (IVF) by analyzing cadaveric spines. METHODS: One hundred ninety-eight cadaveric lumbar IVFs were studied, and the existence and type of TFLs were identified. All IVFs were photographed, and the images were saved. The areas of the IVFs and TFLs were measured with the Scion Image for Windows image analysis program. RESULTS: TFLs were found in 82.8% of the IVFs. The oblique inferior transforaminal ligament was the most common. The mean area of the IVFs was 155.8 ± 51.1 mm2, and the mean area occupied by the TFLs was 46.3 ± 37.6 mm2. The mean percentage of the IVF area occupied by the TFLs was 28.5 ± 18.8%. CONCLUSION: TFLs are common structures in the IVF and may reduce the space available for the spinal nerve root within the IVF. In this circumstance, any compromise of the IVF may impinge on the nerve root.
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Lee, Myeounggon, Changhong Youm, Byungjoo Noh, and Hwayoung Park. "Low composite functional movement screen score associated with decline of gait stability in young adults." PeerJ 9 (April 30, 2021): e11356. http://dx.doi.org/10.7717/peerj.11356.
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Background The functional movement screen (FMS)TM is a screening tool used to evaluate fundamental motor function. A score of 14 for the composite total FMS score (TFMS) is generally used as the cut-off point (≤14/21). In addition, gait analysis is used to evaluate fundamental motor function in humans. Thus, evaluating the fundamental motor function using the FMSTM test and gait analysis at various speeds can provide further understanding of any decline in gait stability. In this study, we aimed to investigate the association between gait ability and fundamental movement patterns in young adults according to the cut-off point. Methods A total of 439 participants (male: 203, female: 236) successfully completed the FMS test and a 1 min treadmill test; the participants were classified into two groups: low TFMS (≤14) and high TFMS (>14). Results The low TFMS group exhibited slower and shortened walking patterns and worsen gait variability than the high TFMS group. The coefficient of variance (CV) for the double support phase at a faster speed (male) and the stride length at a slower speed (female) were classifiers between the two groups. In addition, the low TFMS group demonstrated insufficient gait adaptation at the preferred and faster speeds based on the CV of the double support phase and gait asymmetry. Lower TFMS is associated with a decline in gait ability. Therefore, participants with a lower TFMS and poor gait ability may require intervention programs to prevent risk of future injury and to enhance motor function.
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Win, Shwe Yee, Hikari Seo, Fumiya Horio, et al. "In Vivo Characterization of the Anti-Glutathione S-Transferase Antibody Using an In Vitro Mite Feeding Model." Vaccines 12, no. 2 (2024): 148. http://dx.doi.org/10.3390/vaccines12020148.
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Poultry red mites (Dermanyssus gallinae, PRMs), tropical fowl mites (Ornithonyssus bursa, TFMs), and northern fowl mites (O. sylviarum, NFMs) are blood-feeding pests that debilitate poultry worldwide. Glutathione S-transferase (GST) plays an important role in the detoxification and drug metabolism of mites. However, research on avian mite GSTs as vaccine antigens is still lacking. Therefore, we aimed to evaluate the potential of avian mite GSTs for vaccine development. We identified GST genes from TFMs and NFMs. We prepared recombinant GST (rGST) from TFMs, NFMs, and PRMs, and assessed their protein functions. Moreover, we evaluated the cross-reactivity and acaricidal effect of immune plasma against each rGST on TFMs, NFMs, and PRMs. The deduced amino acid sequences of GSTs from TFMs and NFMs were 80% similar to those of the PRMs. The rGSTs exhibited catalytic activity in conjugating glutathione to the 1-chloro-2,4-dinitrobenzene substrate. Immune plasma against each rGST showed cross-reactivity with rGST from different mite species. Moreover, the survival rate of PRMs fed with immune plasma against the rGST of TFMs and NFMs was significantly lower than that of the control plasma. These results demonstrate the potential application of GST as an antigen for the development of a broad-spectrum vaccine against avian mites.
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Guerra-Guzman, Karina E., Dominique R. Ghirardi, and Anthony LoGalbo. "59 Effects of Cognitive Impairment, Geriatric Depression, and Anxiety on the Texas Functional Living Scale (TFLS) in a Memory Disorder Clinic." Journal of the International Neuropsychological Society 29, s1 (2023): 569–70. http://dx.doi.org/10.1017/s1355617723007300.
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Objective:The Texas Functional Living Scale (TFLS) is a measure of adaptive functioning commonly utilized across the geriatric population. Current research suggests that those with Alzheimer’s disease and other dementias perform poorly on the TFLS, compared to those with mild cognitive impairment (MCI) and normal cognition (Cullum et al., 2001). Additional research is needed to examine the influence anxiety and depressive symptoms have on activities of daily living (ADLS) in individuals being evaluated for memory disorders. This study will examine the effects of anxiety and depression on adaptive functioning across all patients, and within samples of those with dementia and MCI. It is hypothesized that higher reported anxiety and depressive symptoms will predict lower scores of ADLS.Participants and Methods:Patients at a memory disorder clinic (N = 756; 58.2% female) were screened for cognitive impairment using the Montreal Cognitive Assessment (MoCA). A brief neuropsychological evaluation (BNE) was then conducted in which the TFLS, Geriatric Depression Scale (GDS), and Geriatric Anxiety Inventory (GAI) were administered, among other measures.Results:A stepwise hierarchical regression was conducted on the entire sample to examine the effects of anxiety and depressive symptoms on TFLS performance, controlling for cognitive impairment using the MoCA. Lower MoCA scores explained a significant amount of variance in TFLS performance (R2 = 0.456, F(1, 754) = 632.78, p < .001). MoCA scores (b = 1.27, p < .001), the GAI (b = 0.14, p = .019), and the GDS (b = 0.10, p = 0.039) were significant predictors of poor TFLS performance across the entire sample. Although the MoCA, GDS, and GAI were each significant predictors of the TFLS, the increased variance explained by the GDS and GAI individually was incremental (AR2 = 0.003, F(1, 752) = 3.90, p = .049). Stepwise hierarchical regressions were also conducted on subsamples diagnosed with MCI (N = 171) and dementia (N = 394). For those with MCI, MoCA scores explained a significant amount of variance in TFLS performance (R2 = 0.044, F(1, 169) = 7.80, p = .006). Neither the GAI nor GDS explained significant additional variance. Only MoCA scores (b = .30, p =.006) predicted TFLS performance. For those with dementia, MoCA scores explained significant variance in TFLS scores (R2 = 0.338, F(1, 392) = 200.47, p < .001). The GAI explained additional significant variance when added (AR2 = 0.009, F(1, 391) = 5.26, p = .022). The GDS did not explain any additional variance. Both the MoCA (b = 1.29, p < .001) and the GAI (b = -0.15, p = .002) significantly predicted TFLS performance.Conclusions:While results suggest that anxiety and depressive symptoms alone do not explain a significant degree of variance within scores of adaptive functioning across the entire sample, elevated ratings of anxiety and depressive symptoms were significant predictors of lower scores of ADLS, suggesting some support for our hypothesis. Additionally, anxiety symptoms significantly explained increased variance in TFLS scores for those diagnosed with dementia, suggesting a potential relationship between anxiety levels and poor adaptive functioning for dementia patients.
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Agan, Brian, Bryan Smith, Hsing-Chuan Hsieh, et al. "367. Use of a Brief Task-Based Measure to Assess the Functional Consequences of Cognitive Impairment in HIV." Open Forum Infectious Diseases 6, Supplement_2 (2019): S192—S193. http://dx.doi.org/10.1093/ofid/ofz360.440.
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Abstract Background In spite of viral suppression with antiretroviral therapy (ART), neurocognitive impairment (NCI) affects ~20% of those infected with HIV; most are asymptomatic or only mildly impaired based on instrumental activity of daily living (IADL) self-reported questionnaires. Previous studies have shown a strong association between depression, common among HIV+, and self-reported IADL impairment, potentially confounding evaluation of the functional impact of NCI. We studied a brief (15–20 minutes) task-based measure of function, the Texas Functional Living Scale (TFLS), in the context of HIV, NCI, and depression. Methods Baseline data were analyzed from parallel, longitudinal cohort studies of neurocognitive function among HIV+ and demographically matched HIV-subjects enrolled at NIH and DoD sites. Subjects recruited at NIH were on ART with viral suppression (VS) ≥1 year and nearly all in the DoD also had long-term VS. All participants underwent a standardized, comprehensive neurocognitive battery (7 domains), as well as the TFLS. Global deficit score (GDS) ≥0.5 defined neurocognitive impairment (NCI) and TFLS impairment was defined as T-score >1 standard deviation below mean (i.e., < 40). Results 420 subjects were evaluated with demographics in Table 1. Eighty-five subjects (20%) had NCI by GDS and 57 (13%) subjects had TFLS impairment. 17% had a Beck Depression Inventory II (BDI) score ≥13 indicating significant depressive symptoms. In univariate analysis of Table 1 variables, only HIV status was not significantly different between those with or without TFLS impairment, however after adjustment using multivariable logistic regression, only education level, race, and NCI were associated with TFLS impairment; depressive symptoms (BDI ≥13) were not associated with functional impairment measured by TFLS. Conclusion In parallel DoD and NIH cohorts of well-treated HIV+ and matched HIV- subjects, task-based functional impairment measured by TFLS was strongly associated with NCI, but not with depressive symptoms, suggesting the potential utility of this measure to better understand the functional consequences of HIV associated neurocognitive disorders. While the association of TFLS with education was expected, that with race was not and requires further study. Disclosures All authors: No reported disclosures.
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İZCİ, Kemal, İlhan İLTER, and Gökhan IZGAR. "Adapting the teacher formative assessment literacy scale into Turkish: Validation and reliability study." International Journal of Assessment Tools in Education 11, no. 1 (2024): 67–87. http://dx.doi.org/10.21449/ijate.1343373.
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In the present study, the Teacher Formative Assessment Literacy Scale (TFALS), developed by Yan and Pastore (2022a), was translated into Turkish to examine the factor structure and psychometric characteristics of the scale in a Turkish sample. Data was collected from 318 teachers, of whom 168 were males and 150 were females, working in different state schools in a city in the Central Anatolia Region of Türkiye. As the first step, the scale items were translated and back-translated by experts in both English and Turkish. Afterward, experts were presented with the scale to check for consistency and accuracy based on the feedback received. A pilot study was carried out to establish the linguistic equivalence of the scale, followed by an examination of its structural validity in a Turkish sample. To demonstrate evidence of the confirmed factor structure of TFALS with 22 items, the confirmatory factor analysis (CFA) was conducted. The CFA results demonstrated that the three-factor model of the TFALS-Turkish-version had adequate fit indices. The Cronbach’s alpha coefficient of the total scale was found to be .93. The Cronbach’s alpha for each of the dimensions of TFALS was .90 for the conceptual dimension (7 items), .86 for the practical dimension (8 items), and .88 for the socio-emotional dimension (7 items). Composite reliability coefficients of the dimensions ranged from .78 to .84. The results of this study provide important evidence for the validity and reliability of the Turkish version of the TFALS, confirming that it has good psychometric properties in a Turkish sample
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Chai, Gin, Periyasamy Manikandan, and Xin Li. "A Numerical Study on High Velocity Impact Behavior of Titanium Based Fiber Metal Laminates." Journal of Composites Science 2, no. 4 (2018): 62. http://dx.doi.org/10.3390/jcs2040062.
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The present paper gives details of the structural response of titanium-based fiber metal laminates (TFML) subjected to high velocity impact. Dynamic perforation behavior of two different sample configurations, TFML-2/1 and 3/2 are presented. The behavior of the metal and composite layer is defined using two independent appropriate constitutive material models. Both experimental and numerically predicted residual velocity follows the Recht-Ipson model variation with impact velocity. Being larger in thickness, residual velocity, peak contact force and total energy absorbed were found to be larger for TFML-3/2 than 2/1. However, the contact duration was rather insignificantly affected. Having similar metal volume fraction (MVF), energy dissipated by means of plastic deformation of metal layers was found to be constant for both TFML configurations that were considered. The axisymmetric loading, boundary conditions and having balanced material property distribution along the principle axes resulted in doubly symmetric damage surfaces, both layer-wise and overall. The developed finite element (FE) model adequately simulated the contact behavior and all of the experimentally realized damage modes in the metal and composite layers and confirmed its reliability. Having limited experimental information, the obtained numerical information allows one to briefly understand the dynamic perforation behavior of TFML laminates.
Dissertations / Theses on the topic "TFMLs"
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Kurdi, Abdulaziz Adel H. "Developing high performance polymeric nano-composites for tribological applications." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/20504.
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Polymers and their composites have been widely applied in different industrial sectors as alternatives to conventional metal-based materials, for the better performance of the system, increasing efficiency and cutting down operational costs. In those applications polymeric materials are sometime subjected to tribological loading conditions where external lubricants are not permissible and polymers’ self-lubricating ability is desirable in such tribo-contacts. In particular, high temperature is often the key factor determining the working conditions of polymers. Hence, high performance polymers (HPPs) have received increasing attention in last decades. In view of above-mentioned facts, the present research investigated the tribological performance of some important engineering polymers and their nanocomposites such as epoxy, PEEK, PPP and PBI. For example, nano-silica (SiO2), nano-rubber (CBTN) and titanium dioxide (TiO2) nano-particles have been incorporated in thermosetting epoxy resin and PEEK, respectively, to improve their tribological properties. To explore the effect of harsh environments during sliding wear, pin-on-disk tests of above-mentioned materials were carried out in dry, wet and elevated temperature regimes. Finally, attempts have been made to establish correlations between the basic mechanical properties of HPPs and their sliding wear behaviour. Various wear models to correlate the tribological aspects of HPPs and polymer nanocomposites with associated mechanical properties were examined along with experimental validation. In addition to that, underlying wear mechanisms were taken into account towards model developments. To develop a quantitative solution for wear prediction, the new computer techniques such as artificial neural network (ANN) may be helpful in the area. Accordingly, the ANN was employed to find the general wear trend of materials.
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Xue, Lingjun, and 薛靈駿. "A Feasibility Study on the Diffusion Barrier Property of TFMGs in CIGS Solar Cell Application." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/49238373871082955348.
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碩士<br>國立臺灣科技大學<br>材料科學與工程系<br>103<br>Flexible CIGS solar cells on stainless steel (SS) substrates have attracted considerable interests for their promising potentials, yet the detrimental diffusion of various SS constituents into CIGS absorber under high processing temperature limits the performance of these cells. Thin film metallic glasses (TFMGs), free from grain boundaries and thus lacks fast diffusion paths, are ideal materials for diffusion barrier. Therefore, to employ TFMG diffusion barriers for SS-based CIGS solar cells is probably worth trying.
In this study, TFMGs of Zr53.5Cu29.1Al6.5Ni10.9 (Z-TFMG) and W94Ni0.6B5.4 (W-TFMG) were deposited as diffusion barriers by RF magnetron sputtering. Layered structures of Mo/SS and Mo/Z-TFMG/SS with Z-TFMG thickness of 100 nm were processed and annealed for preliminary investigation. In addition, SS-based CIGS solar cell devices with and without 70-nm-thick Z- or W-TFMG barriers were also fabricated. By using X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and current-voltage (I/V) characterization, the diffusion behaviors in the samples and the performance of the cells were measured and evaluated.
In Mo/SS, crystallographic and compositional changes within the Mo layer are found after annealing, which could be attributed to diffusion of substrate constituents. On the other hand, such changes are absent in the Mo/Z-TFMG/SS. For the CIGS solar cells on SS, the barrierless one suffering the most extensive diffusion has the worst performance, followed by the minor one in W-TFMG cell with improved efficiency. No detectable diffusion is observed in the Z-TFMG cell correlating to its best performance among these cells.
Based on the results, the feasibility to use Z- and W-TFMG as diffusion barriers for SS-based CIGS solar cells is demonstrated. Further work needs to be done to optimize the thickness of the TFMGs as well as to fabricate CIGS cells on SS with comparable efficiency to those based on glass substrates.
Books on the topic "TFMLs"
Book chapters on the topic "TFMLs"
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Bortnick, Kevin. "Texas Functional Living Scale (TFLS)." In Occupational Therapy Assessments for Older Adults. Routledge, 2024. http://dx.doi.org/10.4324/9781003525288-11.
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Miller, Shonique L., Gary L. Lebby, and Ali R. Osareh. "Improving the Performance of the Truncated Fourier Series Least Squares (TFSLS)Power System Load Model Using an Artificial Neural Network Paradigm." In Intelligent Data Engineering and Automated Learning – IDEAL 2010. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15381-5_45.
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Lizandra, Jorge, and Alexandra Valencia-Peris. "Tutorización virtual de Trabajos Final de Máster (TFMs): una experiencia práctica." In Innovative strategies for Higher Education in Spain. Adaya Press, 2018. http://dx.doi.org/10.58909/ad18178652.
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Los procesos de tutorización han evolucionado hacia planteamientos que fomentan el uso de metodologías activas y el aprendizaje autónomo. Las Tecnologías del Aprendizaje y del Conocimiento (TAC) suponen un entorno propicio para la implantación de este tipo de metodologías, que contrastan con el modelo tradicional de enseñanza presencial. Es por ello que estas propuestas deben ir acompañadas de estrategias que faciliten al alumnado tener experiencias de trabajo digital satisfactorias. Por tanto, el objetivo de este trabajo es presentar la experiencia de tutorización virtual de un trabajo fin de máster (TFM), explicando el proceso y los resultados desde la visión del estudiante. El trabajo consistió en explicar y consolidar un sistema de interacción virtual basado en el uso de cuatro canales de contacto: la plataforma Moodle®, el correo electrónico, Skype® y Facebook®. Usando estas herramientas se trató de asegurar, tanto el intercambio de recursos como la corrección y el feed-back del proceso y los sistemas de comunicación formal e informal. Finalizada la tutorización, se pidió al estudiante que redactara un relato en el que reflejara su visión del proceso, con el fin de darle voz en este proceso. Los resultados obtenidos indican que la tutorización virtual resultó exitosa, ya que permitió mantener un contacto directo y eficaz entre el alumno y el tutor, además de secuenciar el trabajo, elementos que consideramos que han influido positivamente en la obtención de un buen resultado final. Esta experiencia nos ha permitido comprender mejor las dinámicas de trabajo a través de las TAC, hecho que nos anima a perseverar y mejorar el método en ediciones futuras.
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Damle, Sankarshan, Varul Srivastava, and Sujit Gujar. "No Transaction Fees? No Problem! Achieving Fairness in Transaction Fee Mechanism Design." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2024. http://dx.doi.org/10.3233/faia240924.
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The recently proposed Transaction Fee Mechanism (TFM) literature studies the strategic interaction between the miner of a block and the transaction creators (or users) in a blockchain. In a TFM, the miner includes transactions that maximize its utility while users submit fees for a slot in the block. The existing TFM literature focuses on satisfying standard incentive properties – which may limit widespread adoption. We argue that a TFM is “fair” to the transaction creators if it satisfies specific notions, namely Zero-fee Transaction Inclusion and Monotonicity. First, we prove that one generally cannot ensure both these properties and prevent a miner’s strategic manipulation. We also show that existing TFMs either do not satisfy these notions or do so at a high cost to the miners’ utility. As such, we introduce a novel TFM using on-chain randomness – rFTM. We prove that rFTM guarantees incentive compatibility for miners and users while satisfying our novel fairness constraints.
Conference papers on the topic "TFMLs"
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Lahbacha, Khitem, Antonio Maffucci, Giulia Di Capua, et al. "Signal Integrity Analysis and Measurement of Thin Film Microstrip Lines (TFMSLs)." In 2025 IEEE 29th Workshop on Signal and Power Integrity (SPI). IEEE, 2025. https://doi.org/10.1109/spi64682.2025.11014449.
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He, Miao, Yongzhi Qu, Eric Bechhoefer, and David He. "A New Acoustic Emission Signal Processing and Feature Extraction Approach for Bearing Fault diagnosis." In Vertical Flight Society 72nd Annual Forum & Technology Display. The Vertical Flight Society, 2016. http://dx.doi.org/10.4050/f-0072-2016-11903.
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A new acoustic emission (AE) signal processing and feature extraction approach to bearing fault diagnosis is presented in this paper. The presented approach uses time-frequency manifold analysis to extract time-frequency manifold feature (TFMFs) from AE signals. It reconstructs a manifold by embedding AE signals into a high-dimensional phase space. The tangent direction of the neighborhood for each point is then used to approximate its local geometry. The variation of the manifolds representing different condition states of the bearing can be revealed by performing multi-way principal component analysis. The AE signals acquired from a bearing test rig are used to validate the presented approach. The test results have shown that the presented approach can interpret different bearing conditions and is effective for bearing fault diagnosis.
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Harhash, M. "Warm forming of thermoplastic fibre metal laminates." In Sheet Metal 2023. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902417-54.
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Abstract. In this paper, the forming behaviour of sheet-like metal/polymer/metal (MPM) and thermoplastic fibre metal laminates (TFMLs) is introduced. TFMLs are based on thin metallic cover sheets and fibre-reinforced thermoplastic matrix (here polyamide 6). With this material combination, the specific mechanical, structural, thermal and acoustic properties can be improved and designed compared to the monomaterials and laminates without fibre reinforcements. However, the restricted formability of TFMLs at room temperature is a strong limitation. Therefore, the approach of this study is concerned with the fundamental description of the influence of warm forming on the degree of the forming improvement of pre-bonded TFMLs sheets experimentally via the investigation of the deep drawability and determining the forming limit curves compared to the formability of steel and MPM sheets. Two elevated test temperatures (200 and 235 °C) besides the room temperature are considered. The results of this approach revealed that warm forming could lead to over 300 % improvement of the forming limit curve (FLC) level of TFML; however, an ignorable difference between 200 and 235 °C is found. For steel and MPM sheets, increasing the temperature showed a slight improvement. Regarding deep drawing, similar results like for FLC were found, where the drawing depth of TFML could be increased from approx. 15 mm up to at least 40 mm before cracking. However, other failure types arose like wrinkling and core squeezing-out. Therefore, a one-step deep drawing approach for TFMLs is foreseen, where the adhesion and forming processes take place simultaneously.
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Bulgakov, Volodymyr, Semjons Ivanovs, Volodymyr Nadykto, and Gennadii Petrov. "Investigation of front plough functioning stability conditions without support wheel." In 22nd International Scientific Conference Engineering for Rural Development. Latvia University of Life Sciences and Technologies, Faculty of Engineering, 2023. http://dx.doi.org/10.22616/erdev.2023.22.tf116.
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An attempt to use the vertical component of the plough traction resistance to load the tractor driving wheels led to the creation of ploughing units according to the “push-pull” diagram. In most of them, in the process of movement, the supporting wheel of the front plough, moving along the bottom of the furrow, limits the depth of ploughing. In addition, it plays the role of an element that copies the trajectory of the previous adjacent pass of the ploughing unit. In the soil conditions where it is problematic to ensure the bottom of the furrow is free from lumps of soil, the front plough support wheel is placed outside the furrow. In this case, the front plough is joined to the tractor without the possibility of their mutual agility in the horizontal plane (that is, rigidly). This article discusses the conditions for operating a front plough without a supporting wheel. With this design, the ploughing depth limiter is an adjustable limiter chain. It is joined to the tractor frame at one end and the other end to one of the lower links of the tractor front hitch linkage system (TFHLS). The total vertical additional load of the tractor’s front axle was taken as an estimated indicator of the front plough functioning. It is carried out by forces acting in the central and lower links and the restrictive chain of TFHLS. Calculations have established that the effect of the ploughing depth and the front plough specific resistance on the total vertical loading of the tractor front axle is less significant than the effect of the plough weight and its operating width. To ensure the structural reliability of elements of TFHLS, the inclination angle of its lower links must be in the range of 0-5°. The inclination angle of the central link of this system can vary between 25-30°.
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Lahbacha, Khitem, Giulia Di Capua, Gianfranco Miele, et al. "Signal Integrity Analysis of Coupled Thin-Film Microstrip Lines (TFMSLs)." In 2023 IEEE 27th Workshop on Signal and Power Integrity (SPI). IEEE, 2023. http://dx.doi.org/10.1109/spi57109.2023.10145525.
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Comeig Ramírez, Irene, Alfredo Juan Grau Grau, Lucía Pinar García, Federico Ramírez López, and Amalia Rodrigo González. "Adquisición de competencias profesionales en el Trabajo Fin de Máster: Colaborar para aportar soluciones reales." In IN-RED 2018: IV Congreso Nacional de Innovación Educativa y Docencia en Red. Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/inred2018.2018.8567.
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Con el objetivo de motivar al estudiante a través de una toma de contacto con la realidad profesional y mejorar el proceso de aprendizaje fomentando la interiorización de la técnicas de trabajo mediante un modelo colaborativo de tutorización, se plantea la inmersión del estudiante en un caso real al que debe aportar una solución. Aportamos como ejemplo la aplicación de esta técnica a la realización del Trabajo Fin de Master (TFM) del Master en Finanzas Corporativas de la Universidad de Valencia (UV). En estos TFMs, los estudiantes deben valorar un proyecto de inversión con consecuencias para la Transferencia de Resultados de Investigación de la UV: Se pretende responder a ¿Qué precio máximodebería estar dispuesta a pagar una empresa por los derechos de explotación de la investigación analizada? Para la realización de estos TFMs, se implementa la pedagogía Aprendizaje Servicio mediante la metodología de Trabajo Cooperativo que permite desarrollar una enseñanza centrada en la participación del alumnado favoreciendo el desarrollo de unos conocimientos más sólidos y duraderos. La innovación presentada permite al alumnado poner en práctica los conocimientos adquiridos en sus estudios de máster y les aproxima a la realidad empresarial. Palabras clave:se trabajo fin de master, competencias profesionale, metodología de trabajo cooperativo, valoración financiera.
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Khomchenko, V. S., V. E. Rodionov, and Yu A. Tzirkunov. "Short-wave emission of Tb3+as an optical indicator of TFELS matrix changes." In International Conference on Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics, edited by Sergey V. Svechnikov and Mikhail Y. Valakh. SPIE, 1998. http://dx.doi.org/10.1117/12.306226.
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Tanaka, Takayuki, Kenjiro Nishikawa, and Masayoshi Aikawa. "Tunable branch-line hybrid circuit using electrical length variable quasi-distributed TFMS line." In 2004 10th International Symposium on Antenna Technology and Applied Electromagnetics and URSI Conference. IEEE, 2004. http://dx.doi.org/10.1109/antem.2004.7860703.
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Ben Ali, K., and J. P. Raskin. "Nonlinear characteristics and RF losses of CPW and TFMS lines over a wide temperature range." In 2016 IEEE 16th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF). IEEE, 2016. http://dx.doi.org/10.1109/sirf.2016.7445458.
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Sapkota, Pradeep, Sameera Wijeyakulasuriya, Shuaishuai Liu, et al. "Accelerating Detailed Chemistry Simulations of Hydrogen Combustion in IC Engines Using Reynolds-Averaged Navier-Stokes (RANS) Turbulence Modeling and a Thickened Flame Model." In ASME 2024 ICE Forward Conference. American Society of Mechanical Engineers, 2024. https://doi.org/10.1115/icef2024-140645.
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Abstract Green hydrogen, with its potential to significantly reduce transportation CO2 emissions, emerges as a promising solution to combat human-induced climate change. However, challenges such as flame instability and pre-ignition pose significant obstacles to its integration into internal combustion engines (ICEs). Computational fluid dynamics (CFD) is an important tool available for engineers to overcome these challenges towards enhancing engine efficiency, combustion stability and reducing emissions. Hence, novel CFD approaches to simulate hydrogen ICEs in an economical way is of importance. In the current study, hydrogen combustion is simulated in a turbocharged port fuel injection (PFI) spark ignited (SI) engine utilizing detailed chemistry along with a thickened flame model (TFM). The primary objective of employing a TFM is to increase the turbulent flame thickness, thus enabling more economical simulations while maintaining solution accuracy. The turbulence model utilized in this investigation is the RNG k-ϵ model, as this model also facilitates economical simulations. While TFMs are conventionally used with Large Eddy Simulation (LES) turbulence models, the current implementation extends this approach to Reynolds-Averaged Navier-Stokes (RANS) models. RANS models inherently introduce a thickening effect on the flame due to their higher turbulent viscosity. However, additional thickening can be beneficial for hydrogen flames, which tend to be thinner compared to traditional hydrocarbon fuel flames. This model effectively alleviates the computational burden associated with resolving thin hydrogen flames, rendering them computationally efficient for CFD simulations of H2 ICEs. In this study, a mixture-averaged diffusion model combined with detailed chemistry is employed to account for both preferential diffusion and H2 combustion. Several engine operating points are simulated and compared against measured cylinder pressure data, demonstrating good agreement. The utilization of TFM enables the simulation of multiple engine cycles with a significantly reduced wall clock time. The paper compares the cylinder pressure predictions and the run times from RANS simulations with and without the use of TFM with that of LES simulations with TFM to show how the use of TFMs with RANS in hydrogen ICE simulations offer a promising avenue for advancing research in sustainable transportation technologies.