Artykuły w czasopismach: „Textural atomization”

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Li, Xuemu, Jianxin Deng, Lili Liu, Liangliang Zhang, Jie Sun, Dongliang Ge, Yayun Liu i Ran Duan. "Tribological properties of WS2 coatings deposited on textured surfaces by electrohydrodynamic atomization". Surface and Coatings Technology 352 (październik 2018): 128–43. http://dx.doi.org/10.1016/j.surfcoat.2018.08.011.

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González, M. Mar, Mercedes Gallego, Miguel Valcárcel i Gaspar Gómez-Cárdenas. "Slurry Atomization of Wheat-Milled Fractions for Electrothermal Atomic Absorption Spectrometric Determination of Nickel and Chromium". Journal of AOAC INTERNATIONAL 84, nr 6 (1.11.2001): 1914–20. http://dx.doi.org/10.1093/jaoac/84.6.1914.

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Abstract A slurry electrothermal atomic absorption spectrometric technique was used to determine Ni and Cr in wheat flour and its by-products. Slurries (3%, w/v) were prepared in a mixture of 15% HNO3–10% H2O2 as suspended medium. Differences in Ni and Cr contents due to origin and texture of the wheat and to the effects of the milling process were studied. Ni and Cr levels were more markedly influenced by the geographical origin of the wheat than by its texture. Both metals were related to the amount of bran present in each milled fraction and varied over the ranges of 212–298 ng/g (Ni) and 34–85 ng/g (Cr) in flours (with minimal bran contents); 297–460 ng/g (Ni) and 67–118 ng/g (Cr) in shorts; and 424–723 ng/g (Ni) and 106–165 ng/g (Cr) in brans. The Ni and Cr contents were not significantly affected by the technological processes typically performed in a flour-producing factory.

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Son, Hyeon-Taek, Hyo-Sang Yoo, Yong-Ho Kim, Chul-Hee Lee i Soon-Jik Hong. "Microstructure and Texture of P-Type Bi—Sb—Te Alloy by Using Gas-Atomization and Extrusion Processes". Journal of Nanoscience and Nanotechnology 19, nr 4 (1.04.2019): 2236–39. http://dx.doi.org/10.1166/jnn.2019.16000.

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Wu, Jiaxing, Jianxin Deng, Ying Meng, Shijie Wang, Ran Wang, Xuemu Li i Wei Sun. "Tribological properties of PTFE/PPS films deposited on the ultrasonic rolling textured substrates by electrohydrodynamic atomization under dry reciprocating sliding". Wear 488-489 (styczeń 2022): 204156. http://dx.doi.org/10.1016/j.wear.2021.204156.

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Sánchez López, Iván, Arnau Gifreu Castells i Jaime García Claro. "How to analyze digital content?" Miguel Hernández Communication Journal 15 (31.07.2024): 295–321. http://dx.doi.org/10.21134/3wag2c48.

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In recent years there has been an exponential multiplication of media content, platforms and uses. After contextualizing the decline of the great theoretical currents of communication and exposing the linguistic bias of semiotics, this article proposes a review and characterization of the referential instruments and methodologies for the analysis of textual, multimodal and transmedia objects, with special emphasis on those of a connected digital nature. For this purpose, an integrative review of 75 documents that address the issue is carried out, leaving the final sample composed of the 25 most relevant for the purposes of the research. The epistemological-instrumental route goes from the Structural Analysis of the Story to Computer Vision, passing through Digital Ethnography and Multimodal Discourse Analysis. The conclusions include a sketch of an analysis instrument that synthesizes the study carried out, previously revealing the axiom put forward by several authors that there is no single invariable method for the study of this type of objects. The tendency, on the contrary, points to the atomization of research on specific aspects, rather than to a search for the generalization of results and the consolidation of theoretical bodies and universalizable techniques. It is also noted that quantitative turn and algorithmic programming for the study of digital objects open up a new analytical dimension with transhuman capabilities that is still far from being accessible to the international scientific community.

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Shi, Cheng, Meng-Hua Wu, An Zuo, Mi-Mi Yang i Rong-Rong Jiang. "Clinical analysis of 114 cases of bronchiolitis in infants". World Journal of Clinical Cases 11, nr 35 (16.12.2023): 8284–90. http://dx.doi.org/10.12998/wjcc.v11.i35.8284.

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BACKGROUND Bronchiolitis is a common lower respiratory tract infection in infants and young children. Severe cases may be accompanied by obvious dyspnea and oxygen saturation decline. AIM To summarize the clinical features, standard diagnosis, and treatment of bronchiolitis. METHODS This is a retrospective analysis of 114 pediatric patients (74 males, 40 females) who were first diagnosed as having bronchioles at the Department of Pediatrics of Tongling Maternal and Child Health Hospital from January 2019 to December 2019. The clinical features, imaging features, treatment, and other clinical data were recorded and analyzed. RESULTS The age of onset of the disease was mainly from 1 mo to 6 mo (75.4%), and the time to hospital visit was mostly from the 2nd day to the 4th day of the course of the disease (75.4%). Lung imaging examination showed increase in lung texture, fuzzy (93.8%). The main treatment was atomization therapy: Budesonide combined with terbutaline (45.6%) and budesonide combined with salbutamol (38.5%). The average hospitalization time was 7.1 ± 2.4 d, and the overall cure rate was 94.7%. In patients without bacterial infection, the use of antibiotics significantly prolonged the length of hospital stay (7.8 ± 2.5 d vs 5.7 ± 1.8 d) and improved the cure rate (98.3% vs 87.9%, P < 0.05). CONCLUSION Infants with bronchiolitis are mainly male and tend to have a good prognosis. However, the unneeded use of antibiotics may prolong the length of hospital stay significantly, which imposes the burden both on the patients and hospital system.

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Kim, Hyo-Seob, Peyala Dharmaiah i Soon-Jik Hong. "Thermoelectric Properties of Texture-Controlled (GeTe) x (AgSbTe2)100−x (x = 75, 80, 85, and 90) Alloys Fabricated by Gas-Atomization and Hot-Extrusion Processes". Journal of Electronic Materials 47, nr 6 (28.11.2017): 3119–26. http://dx.doi.org/10.1007/s11664-017-5961-3.

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Аванесов, Сергей Сергеевич. "MISUAL PATTERNS OF THE URBAN ENVIRONMENT AND LOCAL IDENTITY". ΠΡΑΞΗMΑ. Journal of Visual Semiotics, nr 4(38) (24.11.2023): 14–36. http://dx.doi.org/10.23951/2312-7899-2023-4-14-36.

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В статье взаимно соотносятся тренд на «цифровизацию» человека и тенденция к атомизации городского пространства. Показано, что фрагментация современного человека и его практик аналогична дроблению городской среды. Излагается концепция визуального каркаса (текстуры) городского пространства, а также обосновывается неоднородность этого каркаса. Исследуются различные подходы к определению содержания, роли и количества элементов городской среды, или паттернов городского пространства, аргументируется смысловой и визуальный характер этих элементов. Демонстрируется отличие урбанистического паттерна от архитектурного, градостроительного и дизайнерского. Показана связь городской текстуры с индивидуальным обликом города. Исследованы качества и функции визуальных паттернов городской среды. Обоснован тезис о том, что единство городской среды удерживается благодаря взаимной открытости ключевых паттернов, а деградация городского пространства вызвана как нарушением целостности паттернов, так и их взаимной изоляцией. Паттерны как ключевые узлы визуально-пространственной среды представлены как взаимосвязанные локализованные социокультурные процессы, направленные на формирование элементов уникального облика города, то есть функционируют в качестве согласованных способов построения локальной идентичности. This article correlates the trend towards the “digitalization” of a person and the trend towards the atomization of urban space. It shows that the fragmentation of modern man and his practices is similar to the fragmentation of the urban environment. The concept of the visual frame (texture) of the urban space is presented, and the heterogeneity of this frame is substantiated. Various approaches to determining the content, role and number of elements of the urban environment, or patterns of urban space are explored; the semantic and visual nature of these elements is argued. The difference between the urban pattern and the architectural, urban planning, and design patterns is demonstrated. The connection between the urban texture and the individual appearance of the city is shown. The qualities and functions of the visual patterns of the urban environment are investigated. The thesis is substantiated that the unity of the urban environment is maintained due to the mutual openness of the key patterns, and the degradation of the urban space is caused both by the violation of the integrity of the patterns and their mutual isolation. Patterns as key nodes of the visual-spatial environment are presented as interrelated localized socio-cultural processes aimed at forming elements of the unique image of the city, that is, they function as coordinated ways of building a local identity.

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Pérez-Cerrato, Mikel, Jose F. Gómez-Cortés, Ernesto Urionabarrenetxea, Isabel Ruiz-Larrea, Fernando Carreño, Ízaro Ayesta, María L. Nó, Nerea Burgos i Jose M. San Juan. "Powder Metallurgy Processing to Enhance Superelasticity and Shape Memory in Polycrystalline Cu–Al–Ni Alloys: Reference Material for Additive Manufacturing". Materials 17, nr 24 (17.12.2024): 6165. https://doi.org/10.3390/ma17246165.

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Shape memory alloys (SMAs) are functional materials with a wide range of applications, from the aerospace sector to the biomedical field. Nowadays, there is a worldwide interest in developing SMAs through powder metallurgy like additive manufacturing (AM), which allows innovative building processes. However, producing SMAs using AM techniques is particularly challenging because of the microstructure required to obtain optimal functional properties. This aspect is critical in the case of Cu–Al–based SMAs, due to their high elastic anisotropy, making them brittle in polycrystalline form. In this work, we approached the processing of a Cu–Al–Ni SMA following a specific powder metallurgy route: gas atomization of a pre-alloyed melt; compaction of the atomized powders through hot isostatic pressing; and a final hot rolling plus thermal treatments. Then, the microstructure of the material was characterized by electron microscopy showing a specific [001] texture in the rolling direction that improved the functional behavior. The successive processing steps produce an increase of about 40 °C in the martensitic transformation temperatures, which can be well controlled and reproduced through the developed methodology. The thermomechanical functional properties of superelasticity and shape memory were evaluated on the final SMA. Outstanding, fully recoverable superelastic behavior of 4.5% in tension, as well as a ±5% full shape memory recovery in bending, were reported for many cycles. These experiments demonstrate the enhanced mechanical and functional properties obtained in polycrystalline Cu–Al–Ni SMAs by powder metallurgy. The present results pave the road for producing this kind of SMA with the new AM technologies, which always produce polycrystalline components and can improve their processes taking the powder metallurgy SMA, here produced, as reference material.

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Kaushik, Mayank Dutt. "The Unorthodox Jukebox of the Picaresque Young Girl Phenomenon: An amelioration of subsumable genres". Shodh Sari-An International Multidisciplinary Journal 02, nr 03 (20.07.2023): 446–61. http://dx.doi.org/10.59231/sari7618.

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We live in a dodecahedron-structured cybernetic enmeshment of technology running through an extension of media convergence. In this context, the psychic fragmentation of a postmodern aesthetic is radically splintered and spreadeagled. The reflexivity praxis, embedded in a multisensory milieu navigating strange peregrinations (from modernity to postmodernity to post-post modernity), is tearing apart the current fabric, particularly through cinematic endeavors. Therefore, cinema hyphenates the piquant postmodernist aesthetics by orchestrating fragmentation, hyperkinetic synergy, anachronistic mode, pastiche, meta narratives, beats of simulacrum, and the dementia praecox of mutagenicity, to name a few. Films like Everything, Everywhere, All at Once (2022), directed by Daniel Kwan and Daniel Scheinert, encapsulate the current vertiginous reality through a metaverse of careening camera movement, frenetic editing, and the pulverization of the fractured self. A new neologism called “transgene” gets illustrated in the film, wherein multiple genre textures (science fiction, comic book aesthetic, melodrama, comedy, action, and an LGBTQ troupe) are indicated through singular sequences or even images in the film. This film clearly obfuscates the clarity of genre iconicity and exhibits a continuum of energy (flowing), but an interesting embodiment of the young girl concept through the character of Jobu Tupaki provides us with a structure in which postmodernism, transgene, and the young girl get encapsulated. The nihilistic and sassy daughter of Evelyn Wang has been fractured across realities of the metaverse, which renders her a powerful universal being bent on causing chaos and destruction. I shall attempt to outline the major configurations and reconceptualizations of several cinematic genres while foregrounding the plane of reality in which postmodernist cinema transforms into a trans-genre or rather undergoes a metamorphosis into a trans-genre. Additionally, it explores the phenomenon of a young girl functioning as a sublime and spectral obsequiousness amalgamated into the infrastructure of postmodernism, resulting in the atomization of trans-genres showcasing everything, everywhere, all at once. Furthermore, the confluence of these genre aesthetics prepares a bouillabaisse that embodies several configurations of young girls or the becoming of young girls (by all genders and ages) through an apocalyptic dread, permeable brain leaks, and a genre mix.

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Mufarrih, AM, Moh Nasir Hariyanto i Nanang Qosim. "Analisa Kekasaran Permukaan Titanium Grade 2 pada Proses Frais". Jurnal Pendidikan Teknik Mesin Undiksha 8, nr 2 (1.08.2020): 53. http://dx.doi.org/10.23887/jptm.v8i2.27766.

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Titanium Grade 2 termasuk jenis bahan yang sering dipergunakan di industri, utamanya pada bahan untuk implan biomedis. Titanium Grade 2 mempunyai sifat perbandingan kekakuan terhadap berat yang baik, tahan terhadap korosi dan memiliki sifat biokompatibel yang baik di dalam tubuh. Namun memiliki konduktifitas panas yang rendah, sehingga perlu memilih perameter pemesinan yang tepat untuk menghasilkan nilai kekasaran permukaan yang baik. Penelitian ini bertujuan untuk mengetahui karakteristik Titanium Grade 2 yaitu kekasaran permukaan hasil pemesinan frais. Desain penelitian menggunakan metode Taguchi L9, dengan 2 faktor dan 3 level. Parameter pemesinan yang digunakan ialah putaran spindel 500; 700; 900 rpm dan kecepatan pemakanan 25; 50; 75 mm/menit. Variabel respon yang diteliti ialah kekasaran permukaan. Proses frais dilakukan menggunakan Mesin CNC Dahlih. Kekasaran permukaan diukur menggunakan Mitutoyo surface roughess tester. Analisis data menggunakan analisis ANOVA. Hasil penelitian menunjukan bahwa ada pengaruh variasi parameter pemesinan terhadap respon kekasaran permukaan. Variabel putaran spindel mempunyai p-value sebesar 0,039 dan variabel gerak makan memiliki p-value sebesar 0,025. Hal ini menunjukkan bahwa kedua variabel bebas tersebut memiliki pengaruh yang signifikan terhadap respon kekasaran permukaan. Kekasaran permukaan terendah dapat dicapai dengan pengaturan putaran spindel sebesar 700 rpm dan kecepatan pemakanan sebesar 25 mm/menit. Kata kunci: titanium grade 2, kekasaran permukaan, frais, anova Daftar RujukanBagno, A., & Di Bello, C. (2004). Surface treatments and roughness properties of Ti-based biomaterials. Journal of Materials Science: Materials in Medicine. https://doi.org/10.1023/B:JMSM.0000042679.28493.7fBruce, 2011. (2013). Analisis Kekasaran Permukaan Dan Getaran Pada Pemesinan Bubut Menggunakan Pahat Putar Modular (Modular Rotary Tools) Untuk Material Titanium 6Al-4V Eli. Journal of Chemical Information and Modeling. https://doi.org/10.1017/CBO9781107415324.004Davim, J. P. (2011). Machining of hard materials. Machining of Hard Materials. https://doi.org/10.1007/978-1-84996-450-0Ganguli, S., & Kapoor, S. G. (2016). Improving the performance of milling of titanium alloys using the atomization-based cutting fluid application system. Journal of Manufacturing Processes. https://doi.org/10.1016/j.jmapro.2016.05.011Karkalos, N. E., Galanis, N. I., & Markopoulos, A. P. (2016). Surface roughness prediction for the milling of Ti-6Al-4V ELI alloy with the use of statistical and soft computing techniques. Measurement: Journal of the International Measurement Confederation. https://doi.org/10.1016/j.measurement.2016.04.039Kiswanto, G., Mandala, A., Azmi, M., & Ko, T. J. (2020). The effects of cutting parameters to the surface roughness in high speed cutting of micro-milling titanium alloy ti-6al-4v. Key Engineering Materials, 846 KEM, 133–138. https://doi.org/10.4028/www.scientific.net/KEM.846.133Mufarrih, A., Istiqlaliyah, H., & Ilha, M. M. (2019). Optimization of Roundness, MRR and Surface Roughness on Turning Process using Taguchi-GRA. In Journal of Physics: Conference Series. https://doi.org/10.1088/1742-6596/1179/1/012099Nithyanandam, J., Das, S. L., & Palanikumar, K. (2015). Inluence of Cutting Parameters in Machining of Titanium Alloy. Indian Journal of Science and Technology, 8(8), 556–562. https://doi.org/10.17485/ijst/2015/v8i/71291Oshida, Y. (2012). Bioscience and Bioengineering of Titanium Materials: Second Edition. Bioscience and Bioengineering of Titanium Materials: Second Edition. https://doi.org/10.1016/C2011-0-07805-5Setyowidodo, I., Sutanto, S., Mufarrih, A., & Sholehah, I. M. (2020). Exhaust temperature and peltier element optimization of thermoelectric generator output. In IOP Conference Series: Materials Science and Engineering. https://doi.org/10.1088/1757-899X/850/1/012007Shucai, Y., Chunsheng, H., & Minli, Z. (2019). A prediction model for titanium alloy surface roughness when milling with micro-textured ball-end cutters at different workpiece inclination angles. International Journal of Advanced Manufacturing Technology. https://doi.org/10.1007/s00170-018-2852-6Soepangkat, B. O. P., Pramujati, B., Effendi, M. K., Norcahyo, R., & Mufarrih, A. M. (2019). Multi-objective Optimization in Drilling Kevlar Fiber Reinforced Polymer Using Grey Fuzzy Analysis and Backpropagation Neural Network–Genetic Algorithm (BPNN–GA) Approaches. International Journal of Precision Engineering and Manufacturing. https://doi.org/10.1007/s12541-019-00017-zTapiero, H., Townsend, D. M., & Tew, K. D. (2003). Trace elements in human physiology and pathology. Copper. Biomedicine and Pharmacotherapy. https://doi.org/10.1016/S0753-3322(03)00012-XThepsonthi, T., & Özel, T. (2012). Multi-objective process optimization for micro-end milling of Ti-6Al-4V titanium alloy. International Journal of Advanced Manufacturing Technology. https://doi.org/10.1007/s00170-012-3980-zWennerberg, A., & Albrektsson, T. (2009). Effects of titanium surface topography on bone integration: A systematic review. Clinical Oral Implants Research. https://doi.org/10.1111/j.1600-0501.2009.01775.x

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Dumouchel, Christophe, Jean-Bernard Blaisot, Fakhry Abuzahra, Akira Sou, Gilles Godard i Said Idlahcen. "Analysis of a textural atomization process". Experiments in Fluids 60, nr 8 (26.07.2019). http://dx.doi.org/10.1007/s00348-019-2780-8.

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Geiger, Leonardo, Nicolas Fdida, Christophe Dumouchel, Jean-Bernard Blaisot, Luc-Henry Dorey i Marie Théron. "Multiscale analysis of the textural atomization process of a rocket engine-assisted coaxial jet". Experiments in Fluids 65, nr 12 (14.11.2024). http://dx.doi.org/10.1007/s00348-024-03916-8.

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Wu, Jiaxing, Jianxin Deng, Mingyuan Wang, Zhihui Zhang, Ran Wang, Yang Lu, Yichen Bao i Runzhou Tian. "Synergistic Effects of Ultrasonic Rolling Textures and PTFE‐PPS/SiO₂ Coatings on Dry Friction and Wear Properties of GCr15 Steel Surfaces". Advanced Engineering Materials, 14.09.2023. http://dx.doi.org/10.1002/adem.202301108.

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Ultrasonic surface rolling processing (USRP) is used to fabricate textures with different shapes and processing times on the surface of GCr15 substrates. The PTFE‐PPS/SiO2 lubricant coating is subsequently deposited on texture surfaces by electrohydrodynamic atomization (EHDA). USRP texturing not only forms the texture shapes, but also realizes the strengthening effects of increased hardness and residual stress. Synergistic effects of the PTFE‐PPS/SiO2 coating and different USRP textures on dry friction and wear properties are investigated. The results show that the synergistic effect of the linear texture with two processing times and the PTFE‐PPS/SiO2 coating achieves better dry friction and wear performance than the individual effect. The texture shape and the processing times both affect the synergistic effect. The increase in processing times has a positive effect on synergistic improvement. The linear texture plays a better synergistic effect compared with that of the wavy texture with the same processing times. The USRP textures affect the tribological properties of texture‐coating samples by mainly influencing the coating‐substrate adhesion. The texture with an appropriate shape and height can improve the adhesion with the coating, and thus synergistically improve the dry friction and wear properties of the substrate.This article is protected by copyright. All rights reserved.

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Wang, Junyan, Jianxin Deng, Yichen Bao, Kexin Ma, Mingyuan Wang i Runzhou Tian. "Properties of Bi₂S₃ Coatings Deposited on the Bionic Leaf Vein Textured Surfaces With Different Surface Densities". Lubrication Science, 12.09.2024. http://dx.doi.org/10.1002/ls.1722.

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ABSTRACTIn order to investigate the impact of micro‐textured surfaces with varying surface density on coating properties, the bionic leaf vein micro‐texture with different surface densities were prepared on the substrate surface by laser processing. Bi2S3 soft coatings were deposited on the textured surfaces by electrohydrodynamic atomization. The influence of textured surface density on the adhesion and tribological properties of the coatings was analysed and discussed by scratch tests and friction wear tests. The results showed a significant increase in the friction coefficient as the surface density increased. However, after reaching a certain point, the friction coefficient tended to decrease. The coatings deposited on the lower surface density (13.9%, 14.5%) have better tribological performance compared with the higher surface density (35.6%, 36.2%). Meanwhile, the adhesion of coatings on the textured substrate enhanced compared with coatings deposited on the polished substrate. A reasonable textured surface density can effectively improve the adhesion and tribological properties of the coating.

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Ha, Ji‐Won, Vasudevan Rathinam, Eun‐Ha Go i Soon‐Jik Hong. "Grain Size‐Dependent Thermoelectric Performances of Al₂O₃ Addition into BiSbTe Alloy During Heat Treatment Fabricated by Mechanical Alloying". Advanced Engineering Materials, 10.10.2024. http://dx.doi.org/10.1002/adem.202400859.

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Herein, the effect of grain size and its texture orientations on the microstructural and thermoelectric performances of Al2O3 nanofiber (6 wt%)‐doped p‐type BiSbTe (BST)/Al2O3(N) composite before and after heat treatment is revealed. The results are also compared with the spherical Al2O3 particle addition of BST/Al2O3(S) composite. BiSbTe powders are fabricated through water atomization and BST/Al2O3 composites using ball milling followed by spark plasma sintering to obtain bulk compaction. The grain sizes are in the submicrometer ranges for BST/Al2O3 composites; however, it is found to increase after heat treatment, implying that an increment of electrical conductivity for the heat‐treated BST/Al2O3(N) leads to the enhancement in the power factor of 2.1 mW m−1 K−2 at 375 K. On the other hand, the lattice thermal conductivity (κph) is significantly reduced to 0.52 W m−1 K−1 at 400 K and the corresponding thermal conductivity (κ) of 0.89 W m−1 K−1 is attributed to the effective phonon scattering via an interface between low‐dimensional nanofiber of Al2O3 and BST bulk. Also, highly textured grain orientations after heat treatment help to enhance phonon scattering despite larger grain size. Overall, a substantial enhancement of the figure of merit ZTmax. 0.95 at 400 K is compared to BST/Al2O3(S)_HT (=0.7).

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Wang, Ran, Jianxin Deng, Zhihui Zhang i Qinghao Sun. "Tribological properties of Ni3Al-Ti3SiC2-MoS2 composite films deposited on textured surfaces by electrohydrodynamic atomization". Wear, sierpień 2022, 204486. http://dx.doi.org/10.1016/j.wear.2022.204486.

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Bao, Yichen, Jianxin Deng, Shenghan Cao, Xianshun Sun, Zhihui Zhang i Xujie Tang. "In-situ forming textured cutting tools based on electrohydrodynamic atomization and laser micro-cladding technology". Applied Surface Science, listopad 2024, 161856. http://dx.doi.org/10.1016/j.apsusc.2024.161856.

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Roth, Jan-Philipp, Ivo Šulák, Tomáš Kruml, Wojciech Polkowski, Tomasz Dudziak, Peter Böhlke, Ulrich Krupp i Katrin Jahns. "Establishing a process route for additive manufacturing of NiCu-based Alloy 400: an alignment of gas atomization, laser powder bed fusion, and design of experiments". International Journal of Advanced Manufacturing Technology, 3.09.2024. http://dx.doi.org/10.1007/s00170-024-14328-7.

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AbstractAlloy 400 is a corrosion-resistant, NiCu-based material which is used in numerous industrial applications, especially in marine environments and the high-temperature chemical industry. As conventional manufacturing limits geometrical complexity, additive manufacturing (AM) of the present alloy system promises great potential. For this purpose, a robust process chain, consisting of powder production via gas atomization and a design of experiment (DoE) approach for laser powder bed fusion (LPBF), was developed. With a narrow particle size distribution, powders were found to be spherical, flowable, consistent in chemical composition, and, hence, generally applicable to the LPBF process. Copper segregations at grain boundaries were clearly detected in powders. For printed parts instead, low-intensity micro-segregations at cell walls were discovered, being correlated with the iterative thermal stress applied to solidified melt-pool-near grains during layer-by-layer manufacturing. For the production of nearly defect-free LPBF structures, DoE suggested a single optimum parameter set instead of a broad energy density range. The latter key figure was found to be misleading in terms of part densities, making it an outdated tool in modern, software-based process parameter optimization. On the microscale, printed parts showed an orientation of melt pools along the build direction with a slight crystallographic [101] texture. Micro-dendritic structures were detected on the nanoscale being intersected by a high number of dislocations. Checked against hot-extruded reference material, the LPBF variant performed better in terms of strength while lacking in ductility, being attributed to a finer grain structure and residual porosity, respectively.

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