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Effects of spatial uniformity of continuous and pulse laser irradiation on the microstructure and mechanical properties of Ti-6Al-4V in powder bed fusion

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materials Today Communications 2025年 46卷

作者： Seunghwan Moon Seungmuk Ji Yoonseok Ko Min-Su Lee Tea-Sung Jun Dong-Ik Kim Jong-Souk Yeo School of Integrated Technology College of Computing Yonsei University Seoul 03722 Republic of Korea BK21 Graduate Program in Intelligent Semiconductor Technology Yonsei University Seoul 03722 Republic of Korea Center for Energy Materials Research Korea Institute of Science and Technology Seoul 02792 Republic of Korea Department of Mechanical Engineering Incheon National University Incheon 22012 Republic of Korea

Powder bed fusion of metals with laser beam (PBF-LB/M) using Ti-6Al-4V (Ti64) has enabled delicate fabrication of biocompatible medical implants. This research focuses on how the spatial uniformity of laser irradiation affects material under continuous wave (CW) and pulse width modulated (PWM) laser conditions, using a self-developed PBF-LB/M system. The volumetric energy density (VED) was used as a reference parameter in order to accurately compare the effects of CW and PWM lasers, but limitations of VED, which does not include spatial and kinetic factors, which are reinforced in the PWM laser process, were also considered. Results revealed that the uniform distribution of energy irradiation across the entire region brought similar porosities and Vickers hardness tendencies for CW and PWM laser processes. In contrast, the spatially nonuniform energy transfer resulted in a significantly higher porosity in the specimen fabricated using the PWM laser than that produced using the CW laser at the same VED, reducing compressive yield strength. The electron backscattered diffraction analysis showed no significant differences in the average grain size, phase distribution, and misorientation angle of the samples produced using CW and PWM lasers under the same VED. However, sharper grains with an aspect ratio of less than 0.3 were 7 % higher in specimens produced using the PWM laser. This study highlights the possibility of controlling the microstructure and mechanical properties in a wider range when using the PWM laser with spatially nonuniform irradiation.

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MagNet: machine learning enhanced three-dimensional magnetic reconstruction

arXiv

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arXiv 2022年

作者： Lyu, Boyao Zhao, Shihua Zhang, Yibo Wang, Weiwei Du, Haifeng Zang, Jiadong Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei230031 China University of Science and Technology of China Hefei230031 China Department of Physics and Astronomy University of New Hampshire DurhamNH03824 United States Department of Physics The City College of New York New YorkNY10031 United States Physics Program Graduate Center of the City University of New York New YorkNY10016 United States Department of Chemistry University of New Hampshire DurhamNH03824 United States Institutes of Physical Science and Information Technology Anhui University Hefei230601 China Materials Science Program University of New Hampshire DurhamNH03824 United States

Three-dimensional (3D) magnetic reconstruction is vital to the study of novel magnetic materials for 3D spintronics. Vector field electron tomography (VFET) is a major in house tool to achieve that. However, conventional VFET reconstruction exhibits significant artefacts due to the unavoidable presence of missing wedges. In this article, we propose a deep-learning enhanced VFET method to address this issue. A magnetic textures library is built by micromagnetic simulations. MagNet, an U-shaped convolutional neural network, is trained and tested with dataset generated from the library. We demonstrate that MagNet outperforms conventional VFET under missing wedge. Quality of reconstructed magnetic induction fields is significantly improved. Copyright © 2022, The Authors. All rights reserved.

关键词： Magnets

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Application of construction and demolition waste (gypsum and mortar) for the removal of metal ions, Pb 2+ , Cu 2+ , and Ni 2+

Cleaner Chemical Engineering

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Cleaner Chemical Engineering 2025年 11卷

作者： Jefferson Luiz Alves Marinho Francisco Assis Bezerra da Cunha Raimundo Nonato Pereira Teixeira Henrique Douglas Melo Coutinho Jorge Marcell Coelho Menezes Francisco José de Paula Filho Lucia Raquel de Lima Cícera Datiane de Morais Oliveira Tintino Hyan Thompson Oliveira Lopes Paulo Ives Pereira de Alcântara Post-Graduate Program in Biological Chemistry - PPQB at the Regional University of Cariri - URCA Crato Ceará Brazil Science and Technology Center at the Federal University of Cariri - UFCA Juazeiro do Norte Ceará Brazil Pharmacotoxicological Prospection of Bioactive Products Laboratory - UFPE Recife Pernambuco Brazil Analytical and Environmental Chemistry Laboratory - URCA Crato Ceará Brazil

The intensification of human activities, consumption, production, and exploitation of raw materials, coupled with rapid population growth and industrial activity development, has led to significant environmental impacts. As civilization progresses, the level of environmental pollution with toxic metals has also intensified. The ability to quickly detect heavy metal pollution in wastewater and find its source is critical for environmental monitoring and protection. In the search for cheaper and more economical materials to be used as precipitants, civil construction waste has been used for this application. In this context, the present study aimed to evaluate the utilization of construction and demolition waste (gypsum and cementitious mortar) in the retention of Copper, Lead, and Nickel metal ions. The assessment of the removal capacity of these metal ions using gypsum powder and cementitious mortar was conducted through chemical precipitation using batch experiments. The results obtained for Pb 2+ ions showed that increasing the mass of gypsum from 10 to 100 g resulted in precipitation rates ranging from 97.29 to 98.31 %. Gypsum also proved to be a viable alternative for Cu 2+ precipitation with rates of 92.99 to 96.65 %, while the most significant retention rate for Ni 2+ was observed for the mass of 100 g, reaching 94.63 %. In experiments using different types of cementitious mortar (ACI, ACII, ACIII, and common) as precipitants in a solution contaminated with copper at a constant concentration of 600 mg/L, it was found that the precipitation rates were practically the same, with ACIII mortar showing the highest percentage of precipitation. Therefore, the results obtained demonstrated that construction and demolition waste by-products rich in gypsum and cementitious mortar are efficient in removing toxic metals, representing promising alternatives for wastewater decontamination.

关键词： Toxic metals Chemical precipitation Construction and demolition waste Metal removal Geomaterials

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Hatching performances of native chicken supplemented L-arginine in ration and in Ovo injection

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AIP Conference Proceedings 2023年第1期2628卷

作者： I. Muing W. Pakiding S. Purwanti Student of Animal Husbandry Science and Technology Study Program Post Graduate School Hasanuddin University Makassar Indonesia Department of Animal Production Faculty of Animal Husbandry Hasanuddin University Makassar Indonesia Department of Animal Nutrition Faculty of Animal Husbandry Hasanuddin University Makassar Indonesia

This study aims to determine the effect of supplemented by L-Arginine in ration and Treated by L-Arginine in-ovo injection on the hatching performance of native chickens. This study used 60 fertile eggs obtained from hens supplemented by 0% L-Arginine in ration and 60 fertile eggs obtained from hens supplemented by 0.25% L-Arginine in ration. Eggs are arranged by Randomized Block Design with 4 treatments and 3 groups. The treatment consists of P0 (Control=Ration+0% L-Arginine and no L-Arginine injection), P1 (Ration+0% L-Arginine and 2% L-Arginine injection), P2 (Ration+0.25% and without L-Arginine injection), and P3 (Ration+0.25% and injection 2% L-Arginine). The results showed that supplemented by L-Arginine in ration and Treated by L-Arginine in-ovo injection no significant (P>0.05) on the hatching performance of native chickens. We conclude that supplemented by L-Arginine in ration and Treated by L-Arginine in-ovo injection no significant on hatching performance of native chickens although there is a tendency that supplemented of the L-Arginine in ration and Treated by L-Arginine in-ovo injection shows a better trend.

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Accessing the viscera: Technologies for interoception research

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Current Opinion in Neurobiology 2025年 93卷 103050-103050页

作者： Pang, Karen K.L. Mondal, Rajib Sahasrabudhe, Atharva Anikeeva, Polina Department of Brain and Cognitive Sciences Massachusetts Institute of Technology United States K. Lisa Yang Brain-Body Center Massachusetts Institute of Technology United States McGovern Institute for Brain Research Massachusetts Institute of Technology United States Research Laboratory of Electronics Massachusetts Institute of Technology United States MIT-Harvard Graduate Program in Health Sciences and Technology United States Department of Materials Science and Engineering Massachusetts Institute of Technology United States

Interoception, or the perception and regulation of body signals by the central nervous system, is critical for maintaining homeostasis and coordination of behaviors. Deciphering the mechanisms of interoception requires identifying pathways and decoding of diverse signals across the brain-body axis. These studies are enabled by tools to modulate and record physiological processes in the brain and visceral organs. While numerous advanced neurotechnologies are well-established in the brain, these techniques often offer limited utility for other organs, such as the gastrointestinal tract, heart, liver, or bladder. In this review, we highlight recent advances in technologies for recording and modulation of visceral organ physiology in small animals in vivo, with a focus on implantable bioelectronic organ interfaces that can be deployed in behaving animals. We discuss how such interfaces are made possible through innovations in materials and electronics and outline unmet technological challenges in interoception research. © 2025 Elsevier Ltd

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Preliminary study: Production and quality of signal grass (Brachiaria decumbens) on the post mining land

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AIP Conference Proceedings 2023年第1期2628卷

作者： N. A. A. Toputri R. A. Habibi E. Harri Sema R. F. Utamy S. Hasan Animal Husbandry and Technology Post-Graduate Program Hasanuddin University Makassar Indonesia Nursery PT. Vale Sorowako East Luwu South Sulawesi Indonesia Animal Nutrition and Feed Technology Faculty of Agriculture Puangrimaggalatung University Sengkang Indonesia Faculty of Animal Science Universitas Hasanuddin Makassar South Sulawesi Indonesia

The post-mining land decrease soil fertility. Soil fertility is required for plant growth. One way to minimize this soil fertility is by planting grass and legume in a mixed-cropping system. This preliminary study was aimed to evaluate the production and quality of signal grass and legume on the post-mining land of PT Vale Indonesia, Tbk. This study used a descriptive/survey method such as direct measurements and observations in the field. The results showed the average production of fresh weight (7.5 tons/Ha), dry matter (1.5 tons/Ha), chlorophyll (30 mg/g leaves), and leaf area (22.5 cm) of signal grass without legumes. Meanwhile, the average production of fresh weight (15.80 tons/Ha), dry matter (3.16 tons/Ha), chlorophyll (38 mg/g leaves), and leaf area (35.6 cm) of signal grass with legumes.

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Development of novel iron and copper-loaded mesoporous silica particles with exceptional visible-light-induced photocatalytic properties for ultra-fast removal of organic pollutants from wastewater

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Journal of Water Process Engineering 2025年 75卷

作者： Aatif Ijaz Kubilay Sahin Musa Dirak M. Baris Yagci Safacan Kolemen A. Levent Demirel Annamaria Miko Department of Chemistry Koç University Istanbul 34450 Türkiye Institute of Surface Science Helmholtz-Zentrum Hereon Max-Planck Straße 1 21502 Geesthacht Germany Materials Science & Engineering Graduate Program Koç University Istanbul 34450 Türkiye Research Centre for Manufacturing and Materials Functional Materials and Chemistry Research Group Coventry University Beresford Ave Coventry CV6 5LZ UK Chemistry Graduate Program Koç University Istanbul 34450 Türkiye Koç University Surface Science and Technology Center (KUYTAM) Istanbul 34450 Türkiye Semilab Co. Ltd. Surface and Interface Department Prielle Kornélia u. 2 1117 Budapest Hungary

Developing robust and highly efficient photocatalysts with the benefits of delayed electron-hole recombination generating active radicals and better catalytic efficiency in natural sunlight is an imperative task. Herein, photocatalytic Fe 3+ /Fe 2+ /Fe 2 O 3 and Cu 2+ /CuO containing mesoporous spherical silica particles (MSP) were prepared using a facile one-pot synthesis method for the photodegradation of actual textile wastewater under sunlight. Our one-pot room temperature synthesis produced photocatalytic particles with a degradation reaction rate 65 times higher than pure Fe 2 O 3 nanoparticles. Chemical and structural analysis confirmed the successful incorporation of Fe 3+ /Fe 2+ /Fe 2 O 3 , and Cu 2+ /CuO inside the silica framework. MSP carrying copper and iron species (Fe/MSP and Cu/MSP, respectively) demonstrated highly stable catalytic degradation of methylene blue in the presence of H 2 O 2 under visible light irradiation with a photodegradation efficiency of ≥99.9 % after 20 and 10 min, respectively. This excellent photocatalytic performance is attributed to their ability to enhance the formation of both chemically generated and photogenerated hydroxyl radicals resulting from prolonged electron-hole recombination. Fe/MSP were successfully used in the complete photodegradation of real textile wastewater containing various dye molecules, demonstrating practical applicability. Furthermore, these photocatalytic materials showed good stability and recyclability for up to 5 cycles while maintaining their excellent photocatalytic ability. Cu/MSP and Fe/MSP are expected to be promising, cost-effective photocatalysts for efficiently degrading various organic dyes, pesticides, and antibiotic pollutants.

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Manipulating Fano coupling in an opto-thermoelectric field

arXiv

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arXiv 2024年

作者： Lin, Linhan Lepeshov, Sergey Krasnok, Alex Huang, Yu Jiang, Taizhi Peng, Xiaolei Korgel, Brian A. Alu, Andrea Zheng, Yuebing State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing100084 China Department of Electrical and Photonics Engineering DTU Electro Technical University of Denmark Building 343 Kgs. LyngbyDK-2800 Denmark Department of Electrical and Computer Engineering Florida International University MiamiFL33174 United States School of Physics and Electronics Hunan University Changsha410082 China Mc Ketta Department of Chemical Engineering The University of Texas at Austin AustinTX78712 United States Materials Science & Engineering Program Texas Materials Institute The University of Texas at Austin AustinTX78712 United States Department of Electrical and Computer Engineering The University of Texas at Austin AustinTX78712 United States Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center City University of New York NY10016 United States Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States

Fano resonances in photonics arise from the coupling and interference between two resonant modes in structures with broken symmetry. They feature an uneven and narrow and tunable lineshape, and are ideally suited for optical spectroscopy. Many Fano resonance structures have been suggested in nanophotonics over the last ten years, but reconfigurability and tailored design remain challenging. Herein, we propose an all-optical "pick-and-place" approach aimed at assemble Fano metamolecules of various geometries and compositions in a reconfigurable manner. We study their coupling behavior by in-situ dark-field scattering spectroscopy. Driven by a light-directed opto-thermoelectric field, silicon nanoparticles with high quality-factor Mie resonances (discrete states) and low-loss BaTiO3 nanoparticles (continuum states) are assembled into all-dielectric heterodimers, where distinct Fano resonances are observed. The Fano parameter can be adjusted by changing the resonant frequency of the discrete states or the light polarization. We also show tunable coupling strength and multiple Fano resonances by altering the number of continuum states and discrete states in dielectric heterooligomers. Our work offers a general design rule for Fano resonance and an all-optical platform for controlling Fano coupling on demand. Copyright © 2024, The Authors. All rights reserved.

关键词： Light polarization

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Hexaazatriphenylene-Based Two-Dimensional Conductive Covalent Organic Framework with Anisotropic Charge Transfer

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Angewandte Chemie 2023年第42期135卷

作者： Seong-Wook Kim Hyeonjung Jung Dr. Mahmut Sait Okyay Dr. Hyuk-Jun Noh Sein Chung Young Hyun Kim Jong-Pil Jeon Prof. Dr. Bryan M. Wong Prof. Dr. Kilwon Cho Dr. Jeong-Min Seo Prof. Dr. Jung-Woo Yoo Prof. Dr. Jong-Beom Baek Department of Energy and Chemical Engineering/ Center for Dimension-Controllable Organic Frameworks Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea These authors contributed equally to this work School of Materials Science and Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea Materials Science & Engineering Program Department of Chemistry and Department of Physics & Astronomy University of California-Riverside Riverside CA 92521 USA Department of Chemistry Dartmouth College Hanover NH 03755 USA Department of Chemical Engineering Pohang University of Science and Technology Pohang 37673 Republic of Korea School of Materials Science and Engineering/ Graduate School of Semiconductor Materials and Devices Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea

The development of covalent organic frameworks (COFs) with efficient charge transport is of immense interest for applications in optoelectronic devices. To enhance COF charge transport properties, electroactive building blocks and dopants can be used to induce extended conduction channels. However, understanding their intricate interplay remains challenging. We designed and synthesized a tailor-made COF structure with electroactive hexaazatriphenylene (HAT) core units and planar dioxin (D) linkages, denoted as HD-COF. With the support of theoretical calculations, we found that the HAT units in the HD-COF induce strong, eclipsed π–π stacking. The unique stacking of HAT units and the weak in-plane conjugation of dioxin linkages leads to efficient anisotropic charge transport. We fabricated HD-COF films to minimize the grain boundary effect of bulk COFs, which resulted in enhanced conductivity. As a result, the HD-COF films showed an electrical conductivity as high as 1.25 S cm −1 after doping with tris(4-bromophenyl)ammoniumyl hexachloroantimonate.

关键词： Anisotropic Charge Transfer Conductivity Covalent Organic Frameworks Doping

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Deactivation/Regeneration Studies in Structured Monolithic Ni-Based Catalysts Applied in Dry Reforming of Methane

SSRN

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SSRN 2022年

作者： de Araújo, Ítalo R.S. Ribeiro, André T.S. Garcia, Ramón R.P. Sales, Deivson C.S. Almeida, Luciano C. Department of Chemical Engineering Technology and Geoscience Center Federal University of Pernambuco PE Recife50740-521 Brazil Polytechnic School of Pernambuco University of Pernambuco Rua Benfica 455 Madalena PE Recife50720-001 Brazil Materials Science and Engineering Graduate Program Federal University of Piauí PI Teresina Brazil Federal Rural University of Pernambuco Academic Unit of Cabo de Santo Agostinho PE Cabo de Santo Agostinho Brazil

In this work, the Ni/γ-Al2O3 (Ni/Al) and Ni/LA2O3-γ-Al2O3 (Ni/La-Al) catalysts were synthesized by the all-in-one method and used in the Dry Reforming of Methane (DRM). The catalysts were characterized and a smaller Ni crystallite size for the La-promoted catalyst was observed. The effects of the feed ratio (CH4:CO2), the use of La as a promoter of the catalyst support, and the use of the structured system in DRM reaction were investigated. Raman spectroscopy, scanning electron microscopy (SEM), and X-ray diffraction (XRD) were applied to investigate the catalytic deactivation effects. The deactivation of the structured catalysts was also evaluated by applying different weight hourly space velocities (WHSV): 20, 30, and 40 L gcat-1 h-1. Besides that, the regeneration of the catalysts was developed through the comparison of the treatment with CO2 and H2 atmospheres. The catalytic study of the powder samples showed that the lower the CH4:CO2 ratio the higher reactants conversion for both catalysts. It was also noted that the CH4:CO2 feed ratio of 4 provided a conversion 10 % higher for the Ni/La-Al catalyst in comparison with the Ni/Al catalyst. The analogy between the powder and structured systems implied greater conversion for the structured system. Furthermore, the greater and the lower deactivation of the structured systems were identified for the WHSV values of 40 and 20 L gcat-1 h-1, respectively. Finally, the regeneration treatment with CO2 showed to be more efficient than the treatment with H2 © 2022, The Authors. All rights reserved.

关键词： Carbon dioxide

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