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作者： Rambo, Carlos Renato Andrade, Tarcisio Fey, Tobias Sieber, Heino Martinelli, Antônio Eduardo Greil, Peter Materials Science and Engineering Graduate Program-PGMAT Chemical Engineering Department-EQA Federal University of Santa Catarina 88040-900 Florianópolis SC Brazil Materials Science and Engineering Graduate Program-PPGCEM UFRN-Federal University of Rio Grande Do Norte 59072-970 Natal RN Brazil Department of Materials Science Glass and Ceramics University of Erlangen-Nuremberg D-91058 Erlangen Germany American Ceramic Society

Microcellular biomorphous Al2O3 was produced by Al-vapor infiltration in pyrolyzed rattan and pine wood-derived biocarbon preforms. At 1600°C the biocarbon preforms reacted with gaseous aluminum to form Al4C3. After oxidation in air at temperatures between 1550° and 1650°C, for 3 h, the biocarbon preforms were fully converted into α-Al2O3. Owing to the high anisotropy of biomorphous Al2O3, the compressive strength behavior was strongly dependent on the loading direction. The compressive strength of the specimens (0.1-11 MPa) is strongly dependent on their overall porosity and their behavior could be explained using the Gibson-Ashby model. The Darcian permeability (k1), as well as the non-Darcian permeability (k 2), increased with an increase of the total porosity. The Darcian permeability of biomorphous Al2O3 was found to be in the range of 1-8 × 10-9 m2, which is in the order of magnitude of gas filters, and, therefore, suitable for several technological applications. © 2008 The American Ceramic Society.

关键词： Wood products

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Highly active vitamin B 1 Pickering emulsion interface catalysis systems for Knoevenagel condensation

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Surfaces and Interfaces 2025年 68卷

作者： Po Zhang Daliang Liu Xiaohong Chang Xi-Ming Song Zhining Song Quan Li Liaoning Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials College of Chemistry Liaoning University Shenyang 110036 PR China Center for Analysis and Testing College of Chemistry Liaoning University Shenyang 110036 PR China Institute of Advanced Materials and School of Chemistry and Chemical Engineering Southeast University Nanjing Nanjing 211189 PR China Materials Science Graduate Program Kent State University Kent OH 44242 USA

Vitamin B 1 (VB 1 ) is characterized by its non-toxicity, low cost, and good stability, making it a highly promising biobased green catalyst with significant potential for development. Due to its favorable water solubility, research on VB 1 as a catalyst is currently limited to homogeneous and single-solvent heterogeneous catalytic systems, and there are inherent limitations in how to fully dissolve substrates to enhance catalytic performance and expand the range of reaction substrates. In this study, VB 1 was immobilized onto the surface of graphene oxide nanosheets (GOs) through multiple interaction forces, thereby forming GOs-VB 1 composite nanosheets. With the nanosheets, stable toluene/water Pickering emulsion interfacial catalysis (PEIC) systems were constructed for Knoevenagel condensation. By using the PEIC systems, the yields of eight benzylidenemalononitrile derivatives reached 85%-95% after 30 min reaction under static reaction condition of non-agitation at 40 °C with the dosage of only 0.35 wt% GOs-VB 1 , much higher than that catalyzed by VB 1 or GOs-VB 1 in the corresponding single or mixed solvents under the same conditions. The excellent catalytic performance of the VB 1 -based PEIC systems under mild reaction conditions is attributed to the sufficient dissolution of the reactants (malononitrile and benzaldehyde or its derivatives) in the continuous and dispersed phases of the emulsion, respectively, as well as the stable enrichment of the catalyst VB 1 at the large emulsion interface. The PEIC systems exhibited consistently high reaction yields even after undergoing six of recycling.

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Pulmonary Disease Pattern Recognition on X-Ray Radiography Image Using Artificial Neural Network (ANN) Method 3

Pulmonary Disease Pattern Recognition on X-Ray Radiography I...

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3rd Annual Scientific Meeting on Medical Physics and Biophysics, PIT-FMB in conjunction with the 17th South-East Asia Congress of Medical Physics, SEACOMP 2019

作者： Fitriyah, N. Kurniawati, L.D. Purwanti, E. Astuti, S.D. Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya60115 Indonesia Biomedical Engineering Study Program Faculty of Science and Technology Universitas Airlangga Surabaya60115 Indonesia Department of Biomedical Engineering Post-Graduate Program Faculty of Science and Technology Universitas Airlangga Surabaya60115 Indonesia

This research aims to recognize the pattern of pulmonary disease on x-ray radiography image using artificial neural network (ANN) method. The images, which were used such as images of healthy pulmonary, pulmonary tuberculosis, and pulmonary tumour. Pattern recognition was using an extraction feature of GLCM (Gray Level Co-occurrence Matrix) and back propagation method. Before being identified, the images were processed by median filter and adaptive histogram equalization. The GLCM features that used were homogeneity, energy, contrast, variance and correlation. The parameters were learning rate and hidden layer. Learning rate was 0.3 and hidden layer was 25. Back propagation training showed 100% accuracy, which all of 44 images were used had been successfully identified. From the result, the healthy pulmonary showed 60% accuracy, 83.3% for pulmonary tuberculosis and 100% for pulmonary tumor. Hence, the overall result showed 81.25% accuracy, which 13 of 16 images had been successfully identified. From these result, extraction feature of GLCM using back propagation method was capable to recognize the pattern of pulmonary disease. However, due to narrow range of the feature, this application may not be used optimally for comparing features in every category of images. Therefore, the further research is needed to determine the best features and parameters of training back propagation. © Published under licence by IOP Publishing Ltd.

关键词： Pattern recognition

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Chiral phonon-induced magnetization in cerium fluorides

Chiral phonon-induced magnetization in cerium fluorides

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CLEO: Fundamental science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Luo, Jiaming Lin, Tong Zhang, Junjie Chen, Xiaotong Blackert, Elizabeth R. Xu, Rui Yakobson, Boris I. Zhu, Hanyu Department of Materials Science and Nano Engineering Rice University Houston United States Applied Physics Graduate Program Rice University Houston United States

We report that circularly polarized terahertz light pulses can drive chiral phonons, which then induce an effective quasi-static magnetic field on the order of 1 tesla to polarize the paramagnetic cerium fluoride. ... 详细信息

ISBN: (纸本)9781957171395

关键词： Phonons

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Ultrafast dynamics of chiral phonons in tungsten disulfide

Ultrafast dynamics of chiral phonons in tungsten disulfide

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CLEO: Fundamental science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Lin, Tong Chen, Xiaotong Xu, Rui Luo, Jiaming Zhu, Hanyu Department of Materials Science and Nano Engineering Rice University Houston United States Applied Physics Graduate Program Rice University Houston United States

Linearly and circularly polarized phonons in monolayer WS2 are directly excited by resonant infrared pulses. The dynamics of coherent and incoherent chiral phonons are measured by time-resolved Raman spectroscopy and ... 详细信息

ISBN: (纸本)9781957171395

关键词： Time-resolved spectroscopy

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Magnesium/Nano-hydroxyapatite Composite for Bone Reconstruction: The Effect of Processing Method

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Journal of Bionic engineering 2020年第1期17卷 92-99页

作者： Mohammad Khodaei Farahnaz Nejatidanesh Mohammad Javad Shirani Srinivasan Iyengar Hossein Sina Omid Savabi Department of Materials Science and Engineering Golpayegan University of TechnologyGolpayegan ***Iran Dental Materials Research Center Dental Research InstituteSchool of DentistryIsfahan University of Medical SciencesIsfahan ***Iran Post graduate student of Prosthodontics Student Research CommitteeSchool of DentistryIsfahan University of Medical SciencesIsfahan ***Iran Materials Engineering Division Faculty of EngineeringLund UniversityLund 11822100Sweden European Spallation Source ERIC Lund 17622100Sweden Dental Research Center Dental Research InstituteSchool of DentistryIsfahan University of Medical SciencesIsfahan ***Iran

Nano-ceramic particles can serve as reinforcing agents for metallic materials to improve their mechanical ***,it is important to ensure chemical compatibility between the matrix and *** the present study,magnesium composites with and without nano-hydroxyapatite(nHA)particles were fabricated for bone reconstruction *** different techniques were used,Conventional Sintering(CS)of powder compacts and Spark Plasma Sintering(SPS)of pre-compacted *** showed that a 10 wt%addition of nHA particles to magnesium,followed by SPS improved the compression strength by 27%.CS did not lead to any significant improvement compared to SPS processing.X-ray diffraction data after CS revealed the formation of unfavorable phases due to chemical reactions between nHA particles and the magnesium matrix,while these phases were absent after SPS *** mechanical properties of the specimens fabricated by CS were much inferior to those processed using *** shorter processing time associated with SPS leaded to reduced interaction between nHA particles and the Mg-matrix,compared to CS.

关键词： magnesium nano-hydroxyapatite composite materials in situ reaction biomedical-materials

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Can air carbon arc gouging sensitize stabilized or low-carbon austenitic stainless steel?

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International Journal of Pressure Vessels and Piping 2025年 217卷

作者： Arthur de Bribean Guerra Gabriel Roberto Campesan Claudemiro Bolfarini Guilherme Yuuki Koga Federal University of São Carlos Department of Materials Science and Engineering Rod. Washington Luís São Carlos SP CEP 13565–905 Brazil Federal University of São Carlos Graduate Program in Materials Science and Engineering Rod. Washington Luís São Carlos SP CEP 13565–905 Brazil Federal University of São Carlos Center for Characterization and Development of Materials (CCDM) Rod. Washington Luís São Carlos SP CEP 13565–905 Brazil

This paper challenges the widespread skepticism surrounding the use of air carbon arc gouging (ACAG) in repair welding for critical applications in stainless steels, such as oil and gas assets, by evaluating its effects on the electrochemical properties of AISI 316L and AISI 321 austenitic stainless steels. This investigation examines the degree of sensitization and intergranular corrosion susceptibility in a simulated repair scenario. The experimental setup involved creating a gouged groove (6–7 mm depth) adjacent to the heat-affected zone (HAZ) using air carbon arc gouging (ACAG), followed by rewelding via submerged arc welding (SAW). Welded joints were analyzed under three surface preparation conditions after gouging: i) no cleaning, ii) brushing, and iii) rectifying. Electrochemical evaluation was conducted using the double loop potentiokinetic reactivation (DL-EPR) technique in accordance with ISO 12732:2017, while susceptibility to intergranular corrosion was assessed using ASTM A262-15, Practice A, oxalic acid etching tests. The results debunk the prevailing assumption that ACAG inevitably compromises the corrosion resistance of stainless steels. They demonstrate that, even without post-process cleaning, the procedure does not increase sensitization or susceptibility to intergranular attack. These findings validate ACAG as a viable, efficient, and cost-effective method for repair welding in low-carbon or stabilized austenitic stainless steels, simulating field conditions. This includes demanding industries such as oil and gas, where it ensures effective defect removal and full weld penetration while preserving asset integrity and resistance to localized corrosion.

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PEG/protein co-immobilized gold colloids

PEG/protein co-immobilized gold colloids

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54th SPSJ Symposium on Macromolecules

作者： Nagasaki, Yukio Yoshinaga, Kenji Ishii, Takehiko Iijima, Michihiro Aboshi, Fumiko Sakura, Takeshi Takahashi, Tadahito Kataoka, Kazunori Tsukuba Research Center for Interdisciplinary Materials Science University of Tsukuba 1-1-1 Tenn-noudai Tsukuba Ibaraki 305-8573 Japan Department of Materials Science Tokyo University of Science Oyama National College of Technology Preventure Program JST Department of Materials Science and Engineering Graduate School of Engineering University of Tokyo

Gold colloid possessing both lipase and PEG tethered chains on the surface was prepared by the adsorption of lipase, followed by the immobilization of the PEG/polycation block copolymer on the colloid surface. The obtained colloid showed a high dispersion stability at a high salt concentration. The enzymatic activity of the lipase on the colloid complex retained intact. Surprisingly, more than 95% of the initial enzymatic activity was retained after repeated thermal treatments (5 times) at 58°C for 10 min. The PEG condensed layer between the immobilized enzyme on the gold colloid may prevent the denaturation of the enzyme at high temperature.

关键词： Colloids

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Injectable Platelet-Rich Fibrin in Contact with Bone Substitutes, Porous Zirconia, or Laser-Textured Implant Surfaces: A Detailed Morphological Analysis

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Biomedical materials and Devices 2024年第1期2卷 415-426页

作者： Oliveira, Miguel Noronha Varela, Hugo Almeida Nascimento, Rubens M. Sahoo, Narayan Carvalho, Oscar Henriques, Bruno Souza, Júlio C. M. Ceramic and Composite Materials Research Group (CERMAT) Department of Mechanical Engineering (EMC) Federal University of Santa Catarina (UFSC) Post-graduate Program in Materials Science and Engineering Federal University of Rio Grande Norte (UFRN) Center for MicroElectroMechanical Systems (CMEMS-UMINHO) Universidade do Minho LABBELS - Associate Laboratory University of Minho University Institute of Health Sciences (IUCS) CESPU

The aim of the present study was to perform a detailed morphological analysis of an injectable platelet rich fibrin after combination with two different particulate hydroxyapatite-based granules, a porous zirconia block, and laser-textured zirconia or titanium surfaces. Blood samples were harvested from three participants to prepare the flowable injectable PRF in contact or not with particulate hydroxyapatite (Hap), bone mineral granules (DBBM), porous zirconia blocks, laser-textured titanium or zirconia surfaces. Optical and scanning electron microscopy (SEM) were used to evaluate the fibrin network density, fibrin fibers’ diameter, blood cells, and the interaction of PRF with the biomaterials. Histomorphometry of the flowable PRF was also performed using the hematoxylin–eosin staining protocol. Specimens were independently evaluated by two blinded and well-trained researchers in histomorphometry and microscopy. Particulate Hap and DBBM shown different morphological aspects by SEM analyses since DBBM revealed macro- and micro-scale pores while Hap revealed a dense structure. Hydroxyapatite and DBBM granules were entirely embedded by the fibrin-network in the presence of leukocytes and blood platelets. The zirconia porous structured was filled with PRF and its components. Also, the laser-structured zirconia or implant surfaces were entirely coated with the PRF fibrin network embedding leukocytes and blood platelets. Laser-textured titanium surfaces revealed macro- and micro-scale irregularities that increase the surface area and retention of the injectable PRF. Histomorphometric analyses revealed complementary details on the distribution of lymphocytes, red blood cells, and fibrin associated with platelet aggregation. The flowing and viscosity of an injectable platelet rich fibrin provided an agglomeration of synthetic or xenogeneic particulate bone substitutes and the coating of porous zirconia and textured implant surfaces as inspected by scanning electron microsc

关键词： Bone healing Bone substitutes Histology Morphology Platelet-rich fibrin

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Migration and proliferation drive the emergence of patterns in co-cultures of differentiating vascular progenitor cells

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Mathematical Biosciences and engineering 2024年第8期21卷 6731-6757页

作者： Zamora Alvarado, Jose E. McCloskey, Kara E. Gopinathan, Ajay School of Engineering University of California Merced MercedCA95343 United States Graduate Program in Materials and Biomaterials Science and Engineering University of California Merced MercedCA95343 United States Department of Physics University of California Merced MercedCA95343 United States

Vascular cells self-organize into unique structures guided by cell proliferation, migration, and/or differentiation from neighboring cells, mechanical factors, and/or soluble signals. However, the relative contribution of each of these factors remains unclear. Our objective was to develop a computational model to explore the different factors affecting the emerging micropatterns in 2D. This was accomplished by developing a stochastic on-lattice population-based model starting with vascular progenitor cells with the potential to proliferate, migrate, and/or differentiate into either endothelial cells or smooth muscle cells. The simulation results yielded patterns that were qualitatively and quantitatively consistent with experimental observations. Our results suggested that post-differentiation cell migration and proliferation when balanced could generate between 30–70% of each cell type enabling the formation of vascular patterns. Moreover, the cell-to-cell sensing could enhance the robustness of this patterning. These findings computationally supported that 2D patterning is mechanistically similar to current microfluidic platforms that take advantage of the migration-directed self-assembly of mature endothelial and mural cells to generate perfusable 3D vasculature in permissible hydrogel environments and suggest that stem or progenitor cells may not be fully necessary components in many tissue formations like those formed by vasculogenesis. ©2024 the Author(s)

关键词： Endothelial cells

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