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Kinetics and mechanism of growth of β-solid solution during reaction diffusion in binary titanium and zirconium alloy systems

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Defect and Diffusion Forum 2008年 279卷 117-124页

作者： Tiwari, G.P. Taguchi, O. Iijima, Y. Kale, G.B. Post Irradiation Examination Division Bhabha Atomic Research Centre Mumbai India Materials Science and Engineering Miyagi National College of Technology Natori 981-1239 Japan Dept. of Materials Science Graduate School of Engineering Iwate Univ. Japan Materials Science Division Bhabha Atomic Research Centre Mumbai India

High temperature beta-phase in titanium and zirconium alloy systems decomposes through an eutectoid reaction into a Ti- and Zr-rich α-solid solution and an intermetallic compound. The present paper reports the layer growth kinetics of the β-solid solution phase in elemental diffusion couples of titanium and zirconium. The growth kinetics obeys a parabolic growth law. However, the temperature dependence of the growth rate constant shows a bimodal behavior. The Arrhenius plot of the growth rate constant, which is linear at the start, becomes curved at lower temperature ranges. The deviation from the Arrhenius plot of the growth rate constant is related to the curvature in the solvus line of the β-solid solution. A theoretical model for the reaction diffusion responsible for the growth of β-solid solution is presented. The growth rate of β-phase is described by the equation k 2 = Wβ2/t = Dβ.ΔC. ξ, where k is a growth rate constant and Wβ is the thickness of the β-phase formed over a period of time t, Dβ is the interdiffusion coefficient for the β-phase, ΔC is concentration range of β-phase and ξ is a parameter which is a function of the miscibility gaps in the phase diagram on the either side of the ß-phase. The above equation provides a satisfactory description of the various aspect of the phenomenon of the growth of β-phase in Ti-and Zr-alloy systems.

关键词： Temperature distribution

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Nanostructured Multicomponent Bioinks with Nanodiamond and Magnesium-Doped Nanohydroxyapatite for Enhanced Bone Tissue engineering

SSRN

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SSRN 2025年

作者： Nicolae, Carmen-Valentina Jahani Kadousaraei, Masoumeh Yamada, Shuntaro Aydin, Mehmet Serhat Al-Sharabi, Niyaz Campodoni, Elisabetta Sandri, Monica Steinmüller-Nethl, Doris Syverud, Kristin Rashad, Ahmad Stancu, Izabela Cristina Mustafa, Kamal Advanced Polymer Materials Group University Politehnica of Bucharest 1-7 Gh. Polizu Street Bucharest011061 Romania Center of Translational Oral Research Department of Clinical Dentistry Faculty of Medicine University of Bergen Bergen Norway CNR-ISTEC Institute of Science and Technology for Ceramics National Research Council of Italy Faenza Italy DiaCoating GmbH Wattens Austria RISE PFI AS Trondheim Norway Bioengineering Graduate Program Aerospace and Mechanical Engineering University of Notre Dame Notre DameIN46556 United States

The development of bioinks for bone tissue engineering (BTE) requires a precise balance of printability, stability and bioactivity to ensure cell viability while supporting cell attachment, proliferation and osteogenic differentiation. Although numerous bioink formulations for BTE demonstrate good printability and bioactivity, they often lack the stability or osteogenic potential required to support long-term bone regeneration. To address these limitations, we developed multicomponent formulations for extrusion-based bioprinting by combining TEMPO-oxidized cellulose nanofibrils (TO-CNFs) with gelatin methacryloyl (GelMA) and sodium alginate (SA). The formulation was further loaded with nanodiamond particles (NDs), magnesium-doped nanohydroxyapatite (MgHA) or a combination of both to impart synergistic effects. This study investigates the individual and combined effects of NDs and MgHA on the printability, structural integrity, biocompatibility, and osteogenic performance of the bioink, hypothesizing that a dual nanoparticle system could provide superior multifunctionality. Rheological and printability tests confirmed that the incorporation of NDs improved the structural integrity and printing fidelity of the printed structures, with all formulations showing comparable mechanical properties. Seeded human gingival fibroblasts showed enhanced viability and spreading, and favorable metabolic activity and proliferation on ND-containing hydrogels. While the viability and elongation of bioprinted osteoblast-like cells in all four bioinks were comparable, MgHA-containing bioinks promoted osteogenic differentiation of osteoblasts, shown by increased Runx2 expression, ALP activity, and biomineralization. These findings suggest that the combined incorporation of NDs and MgHA within the TO-CNFs-GelMA-SA matrix provides a promising platform with robust printability and enhanced bioactivity, addressing the current trade-offs in the design of bioinks for comprehensive BTE. © 2025,

关键词： Bone

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Transmission of real-time video signal with interference density and human traffic

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Telkomnika (Telecommunication Computing Electronics and Control) 2015年第4期13卷 1352-1360页

作者： Bahaweres, Rizal Broer Karya, Oki Teguh Alaydrus, Mudrik Post-Graduate Program of Electrical Engineering Departement Mercu Buana University Indonesia KompasTV Indonesia Faculty of Science and Technology State Islamic University Syarif Hidayatullah Jakarta Indonesia

The use of mobile phone as a communication tool rapidly increases, as well as various types of functions therein. Among of the many applications on the mobile phone, which are used skype androidbased for teleconferencing via mobile phone. Things can not be separated from these applications is the need of qualified internet network access for these applications can be felt up function. One of the network access to the Internet is widely used today's society is a wi-fi network. Access to the Internet does not always provide the best performance, this is due to many factors, one of which is the presence of interference. In this study, we tested transmission of video signals in real-time using an application skype on the mobile phone. Skype run on wi-fi network, which is influenced by the presence of interference or objects such as human traffic in the network. Wireshark were used to obtain data reliability wi-fi network, known as QoS. While evalvid used to obtain the data QoE restricted only get the data PSNR (Peak Signal To Noise Ratio) and MSE (Mean Square Error). © 2015 Universitas Ahmad Dahlan.

关键词： Wi-Fi

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Modeling the adsorption of ciprofloxacin on magnetic biochar: A comparative study of traditional and advanced approaches

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Journal of Water Process engineering 2025年 74卷

作者： Fuhr, Ana Carolina Ferreira Piazzi Rodrigues, Daniel Lucas Costa Guido, Júlia Amaral de Azevedo, Cristiane Ferraz de Souza, Nicholas Fernandes Dotto, Guilherme Luiz Lima, Eder Claudio Machado Machado, Fernando Technology Development Center Federal University of Pelotas (UFPel) 1 Gomes Carneiro St RS Pelotas 96010-610 Brazil Materials Science and Engineering Graduate Program Federal University of Pelotas (UFPel) 1 Gomes Carneiro St. RS Pelotas 96010-610 Brazil Center of Engineering Federal University of Pelotas 989 Benjamin Constant St. RS Pelotas 96010-020 Brazil Environmental Science Graduate Program Federal University of Pelotas (UFPel) 989 Benjamin Constant St. RS Pelotas 96010-020 Brazil Chemical Engineering Department Federal University of Santa Maria (UFSM) 1000 Roraima Av. RS Santa Maria 97105-900 Brazil Institute of Chemistry Federal University of Rio Grande do Sul (UFRGS) 9500 Bento Gonçalves Av. Postal Box 15003 RS Porto Alegre 91501-970 Brazil

This study prepared magnetic-activated biochar (MAB) through microwave pyrolysis and chemical activation of olive agro-industrial biomass. The adsorbent was characterized by SEM-EDS, FTIR, XRD, N₂ adsorption/desorption, VSM, IEP, and pH point of zero charge techniques, indicating different structural properties. The adsorption capacity for ciprofloxacin (CIP) removal was evaluated through batch tests, assessing kinetics and equilibrium. The adsorption kinetics followed the general order model. The process was fast, with MAB achieving a half-adsorption time of up to 3 min. In contrast, the Liu model showed a maximum capacity of 215 mg g⁻¹ at 328 K. Statistical models indicated multilayer adsorption, with layer numbers varying from 3.4 to 2.1. The temperature significantly affects steric parameters, increasing the number of CIP molecules adsorbed per site while reducing the number of layers formed. Thermodynamic analysis suggested physical interactions, including hydrogen bonding and π-π interactions, as the primary removal mechanisms. A simulated effluent test demonstrated a 98.98 % removal efficiency, confirming MAB's effectiveness in removing emerging pollutants like CIP and its potential for wastewater treatment applications. MAB can be easily recovered from aqueous media using magnetic fields. Additionally, its adsorption capacity can be regenerated using green solvent elution. These characteristics highlight its potential for wastewater treatment of contaminants of emerging concern. © 2025 Elsevier Ltd

关键词： Adsorption Biomass Contaminants of emerging concern Physical interactions Statistical physics

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Water-in-water pickering emulsions stabilized by talc or kaolinite layered particles

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Applied Clay science 2025年 274卷

作者： de Souza Machado, Vitor Vianna Hazt, Bianca Sotiles, Anne Raquel de Freitas, Rilton Alves Wypych, Fernando Department of Chemistry - Federal University of Paraná Caixa Postal 19032 Centro Politécnico Jardim das Américas 81531-980 PR Curitiba Brazil Department of Pharmacy - Federal University of Paraná Caixa Postal 19005 Setor de Ciências da Saúde Jardim Botânico – 80210-170 PR Curitiba Brazil Post-Graduation Program in Materials Science and Engineering - Federal University of Technology Av. dos Pioneiros 3131 - 86036-370 PR Londrina Brazil

Kaolinite (Kaol) - Al2Si2O5(OH)4 and talc - Mg3Si4O10(OH)2 (Talc) are abundant clay minerals, with layered particles characterized by nanometric thicknesses and few micrometers in length. Such characteristics are interesting attributes when considering the stabilization of emulsions with low interfacial tension, like in water-in-water emulsions. Here, Kaol and Talc layered particles were characterized by several instrumental techniques. Then, we evaluated the effect of Kaol and Talc addition on water-in-water emulsions, formed by aqueous colloidal dispersions of amylopectin (AMP) and xyloglucan (XG) polymers. The emulsions were evaluated macroscopically and by means of droplet size distributions. The apparent contact angle (ACA) of a water droplet in atmospheric air was also measured on Kaol and Talc pressed pellets. Due to a larger droplet size (D50 = 2.01 ± 0.20 μm) when compared to Kaol (D50 = 0.34 ± 0.02 μm), Talc particles did not create complete coverage on the droplet surfaces. The droplets were also dragged down faster, increasing coalescence and the average droplet size after 24 h of preparation. In both cases, the difference in densities between the solids and the aqueous phases led to particle sedimentation, even when adsorbed to the interface of the droplets, generating a concentrated emulsion at the bottom of the flasks. While talc particles sedimented completely after 72 h, Kaol ones remained at the droplets interface, creating Pickering emulsions with enhanced stability. © 2025

关键词： Coalescence

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Rheological and stability analysis of cement pastes incorporating silica-based wastes

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Particuology 2024年第6期89卷 144-152页

作者： Julia da Rosa Martins Janaíde Cavalcante Rocha Dachamir Hotza Luciano Senff Graduate Program in Materials Science and Engineering(PPGMAT) Federal University of Santa Catarina(UFSC)Florianópolis88040-900SCBrazil Graduate Program in Civil Engineering(PPGEC) Federal University of Santa Catarina(UFSC)Florianópolis88040-900SCBrazil Graduate Program in Chemical Engineering(POSENQ) Federal University of Santa Catarina(UFSC)Florianópolis88040-900SCBrazil Department of Mobility Engineering Federal University of Santa Catarina(UFSC)Joinville89219-600SCBrazil

This study investigates the influence of waste characteristics,especially zeta potential,on the properties of cement pastes and *** focus is to evaluate the impact of the zeta potential of cement particles and waste materials on the sedimentation speed,rheology,and hardening time of stabilized cement *** Cement II F 40,retarder additive,silica,and fly ash were used in the *** pastes were prepared,and during the stabilization period,their rheological properties and pH were *** zeta potential and sedimentation speed of the cement and waste particles were measured at the pH that the pastes presented during the entire stabilization *** the stabilization period,the pastes were subjected to the hardening time *** zeta potential analyses revealed diverse values for the different powder types,with the cement particles exhibiting a zeta potential of−3.0 mV,the silica particles exhibiting−10.5 mV,and the fly ash particles exhibiting−20.3 *** influence of the high zeta potential modulus was observed on the sedimentation speed,with the solution containing fly ash exhibiting a speed of 40.01μm/s,whereas the solution containing only cement exhibited a speed of 99.38μm/*** the pastes,the results indicate that the presence of fly ash particles with a significantly negative zeta potential led to a 16%reduction in hardening time compared to particles with a lower modulus of zeta *** tests showed that the inclusion of fly ash particles prevented the formation of *** the zeta potential influenced agglomerate formation and hardening time,it was found to have no effect on yield stress or viscosity.

关键词： Wastes Zeta potential Setting time Rheometry

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PVA-based bioinks for 3D bioprinting: A comprehensive review of their applications in tissue engineering

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Bioprinting 2025年 49卷

作者： Narges Johari Zary Adabavazeh Francesco Baino Materials Engineering Group Golpayegan College of Engineering Isfahan University of Technology Golpayegan Iran Ph.D. Program Graduate Institute of Precision Manufacturing National Chin-Yi University of Technology Taichung Taiwan ROC Institute of Materials Physics and Engineering Department of Applied Science and Technology Politecnico di Torino Torino Italy

3D bioprinting is an innovative approach that overcomes the limitations of traditional methods for creating cell-laden biomaterials and constructs. It allows for the fabrication of complex and biologically active tissue structures. This review aims to provide a comprehensive evaluation of polyvinyl alcohol (PVA)-based bioinks within a 3D bioprinting framework. PVA-based bioinks exhibit remarkable properties, such as biocompatibility, biodegradability, and the ability to enhance cell growth and differentiation. These properties make them appropriate for many tissue engineering applications. The study evaluates the physicochemical and biological properties of PVA bioinks, including how they combine with other materials such as gelatin, chitin, chitosan, alginate, agarose, cellulose, κ-carrageenan, methacrylate, nanoparticles, mineral additives, carbon nanotubes, graphene oxide, and extracellular matrix components. Furthermore, this review evaluates the benefits of market availability and enhanced printing resolution, in addition to the challenges posed by complexity, dependency on support baths, and the risk of contamination. The objective of this review is to draw attention to the capabilities of PVA-based bioinks and provide guidelines for future research to improve the effectiveness of these materials in tissue engineering and regenerative medicine.

关键词： Bioprinting Bioink Polyvinyl alcohol PVA-based bioinks

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Identifying irregularity electricity usage of customer behaviors using logistic regression and linear discriminant analysis 3

Identifying irregularity electricity usage of customer behav...

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3rd International Conference on science in Information Technology, ICSITech 2017

作者： Lawi, Armin Wungo, Supriyadi La Manjang, Salama Department of Computer Science Post-graduate Program of Electrical Engineering Dept. Electrical Engineering Universitas Hasanuddin Makassar Indonesia

ISBN: (纸本)9781509058662

This study aims to implement a machine learning technique in identifying the irregularities of customer behavior on the use of prepaid electricity pulses. The methods used are Linear Discriminant Analysis and Logistic Regression. The performance of the classification system will be evaluated using the 10-fold cross-validation technique. Validation results are measured using accuracy, precision and recall values. In this research shows that the use of machine learning technique has a good performance in classification of electrical consumption behavior. Experimental results with the different amount of data testing indicate that Logistic Regression method has high accuracy, precision, and recall value when compared with Linear Discriminant Analysis that is 100%. This is due to Logistic Regression method can predict irregularities accurately because the addition of the amount of data does not affect the performance of the method. © 2017 IEEE.

关键词： Regression analysis

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Recent advances in electronic devices for monitoring and modulation of brain

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Nano Research 2021年第9期14卷 3070-3095页

作者： Yong Won Kwon Yoon Sun Jun Young-Geun Park Jiuk Jang Jang-Ung Park Nano Science Technology Institute Department of Materials Science and EngineeringYonsei UniversitySeoul 03722Republic of Korea Center for Nanomedicine Institute for Basic Science(IBS)Seoul 03722Republic of Korea Graduate Program of Nano Biomedical Engineering(NanoBME) Advanced Science InstituteYonsei UniversitySeoul 03722Republic of Korea

The brain is actuated by billions of neurons with trillions of interconnections that regulate human *** the mechanisms of these systems that induce sensory reactions and respond to disease remains one of the greatest challenges in science,engineering,and *** advances in nanomaterials and nanotechnologies have led to the extensive research of electronic devices for brain interfaces to better understand the neural activities of the brains complex nervous *** development of sensor devices for monitoring the physiological signals of the brain related to traumatic injury status has accompanied by the progress of electronic neural probes in *** addition,these neurological and stereotactic surgical revolutions hold immense potential for clinical analysis of pharmacological systems within cerebral ***,we review the progress of electronic devices interfacing with brain in terms of the materials,fabrication technologies,and device *** activity can be measured and modulated by brain probes based on newly developed nanofabrication ***,in vivo pathological monitoring of the brain and pharmacological assessment has been developed in miniaturized and wireless *** also consider the key challenges and prospects for further development,and explore the future directions emerging in the latest research.

关键词： neural interfaces neural recording neuromodulation intracranial pressure monitoring microfluidic drug delivery

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Real-time optimization using gradient adaptive selection and classification from infrared sensors measurement for esterification oleic acid with glycerol

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International Journal of Intelligent Computing and Cybernetics 2017年第2期10卷 130-144页

作者： Iwan Aang Soenandi Taufik Djatna Ani Suryani Irzaman Post Graduate Program of Agro-industrial Technology Bogor Agricultural UniversityBogorIndonesia and Faculty of Engineering and Computer ScienceKrida Wacana Christian UniversityJakartaIndonesia Post Graduate Program of Agro-industrial Technology Bogor Agricultural UniversityBogorIndonesia Department of Physics Faculty of Mathematics and Natural SciencesBogor Agricultural UniversityBogorIndonesia

Purpose-The production of glycerol derivatives by the esterification process is subject to many constraints related to the yield of the production target and the lack of process *** accurate monitoring and controlling of the process can improve production yield and *** purpose of this paper is to propose a real-time optimization(RTO)using gradient adaptive selection and classification from infrared sensor measurement to cover various disturbances and uncertainties in the ***/methodology/approach-The integration of the esterification process optimization using self-optimization(SO)was developed with classification process was combined with necessary condition optimum(NCO)as gradient adaptive selection,supported with laboratory scaled medium wavelength infrared(mid-IR)sensors,and measured the proposed optimization system indicator in the batch *** Process Modeling and Notation(BPMN 2.0)was built to describe the tasks of SO workflow in collaboration with NCO as an abstraction for the conceptual ***,Stateflow modeling was deployed to simulate the three states of gradient-based adaptive control combined with support vector machine(SVM)classification and Arduino microcontroller for ***-This new method shows that the real-time optimization responsiveness of control increased product yield up to 13 percent,lower error measurement with percentage error 1.11 percent,reduced the process duration up to 22 minutes,with an effective range of stirrer rotation set between 300 and 400 rpm and final temperature between 200 and 210℃ which was more efficient,as it consumed less *** limitations/implications-In this research the authors just have an experiment for the esterification process using glycerol,but as a development concept of RTO,it would be possible to apply for another chemical reaction or *** implications-This research introduces new development of an RTO approach to optimal con

关键词： Gradient technique Infrared sensor Real-time optimization Simulation and modelling Support vector machine

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