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4th IAHr Asian Working Group Symposium on Hydraulic Machinery and Systems

作者： Khan, F. Kumar, A. Staubli, T. Hydraulic Turbine R&D Laboratory Hydro & Renewable Energy Department Indian Institute of Technology Roorkee India Lucerne School of Engineering and Architecture Lucerne University of Applied Sciences and Arts Switzerland

In hydropower plants, the Pelton turbine is a commonly used hydraulic turbine where flow is regulated with a dual mechanism of needle and deflector. The needle is controlled by a servomotor and governor system, where the flow rate varies by adjusting the needle strokes. The needle is operated under the hydraulic force caused by the high-water pressure inside the injector acting on the needle surface. The objective of computing the force balance in a Pelton injector is to determine the force to be supplied by the servomotor. The closing trend is crucial to design the injector for safe operation during an emergency. In this study, the function of the needle and nozzle curve generalizes the variable needle surface area, allowing the geometric properties of the nozzle and needle to be suitable for the needle force evaluation. The single-axis force transducer, which is mounted on the needle rod, has been used in the experimental method for determining the needle forces. The experimental findings are compared to analytical calculations and serve as validation for the accuracy and reliability of the computed results obtained through the analytical approach. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Needles

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Novel hafnium oxide doped G-T-B Glass: Structural, physical, mechanical, optical, and radiation shielding investigation

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results in Physics 2025年 70卷

作者： Mhareb, M.H.A. Kaky, Kawa M. Mahmoud, K.A. Sayyed, M.I. Kadhim, Abed Jawad Maghrbi, Yasser Department of Physics College of Science Imam Abdulrahman Bin Faisal University P.O. Box 1982 Dammam 31441 Saudi Arabia Basic and Applied Scientific Research Center Imam Abdulrahman Bin Faisal University P.O. Box 1982 Dammam 31441 Saudi Arabia Al-Nisour University College Baghdad Iraq R&D Office Vice Presidency for Scientific Research and Innovation Imam Abdulrahman Bin Faisal University P.O. Box 1982 Dammam 31441 Saudi Arabia Ural Federal University 19 Mira St Yekaterinburg 620002 Russian Federation Department of Physics Faculty of Science Isra University Amman Jordan Renewable Energy and Environmental Technology Center University of Tabuk Tabuk 47913 Saudi Arabia Université Côte D'Azur Nice 06100 France College of Arts & Sciences Gulf University for Science and Technology Hawally Kuwait

Three glasses were fabricated using a common melting and annealing process. Hafnium oxide-doped tellurite germanate borate glasses have been investigated for radiation shielding. A series of three glasses with the formula of (35-x) B₂O₃-20TeO₂-10GeO₂-35MgO-xHfO₂ (x = 1.25, 2.5, and 3.75 mol%). X-ray diffraction (Xrd) pattern investigated the glassy phase of the samples. The Makishima-Mackenzie model was employed to evaluate the mechanical features of synthetic glasses. The dissociation energy (G_t) and packing density (V_t) are determined using the related formulas. The optical features of the manufactured glasses were determined using a number of formulas and the UV absorption edge. The energy band gap (E_g) was found using the Mott and davis relation. The refractive index and Urbach energy (E_U) were computed using the related relationships. Many optical features, like metallization (M), transmission (T), reflection loss (r), optical basicity (Λ), optical polarizability (α₀), and optical electronegativity (χ), were computed and reported in this work. Monte Carlo simulation was employed to investigate the gamma-ray shielding parameters over an energy interval that extends from 0.015 MeV to 10 MeV. The increase in HfO₂ content within the concentration rage of 1.25–3.75 mol% increases the linear attenuation coefficient of the prepared glasses across the ranges of 107.510–134.277 cm⁻¹ (at 0.015 MeV) 1.282–1.593 cm⁻¹ (at 0.15 MeV), and 0.183–0.191 cm⁻¹ (at 1.5 MeV). The increase in HfO₂ concentrations is also accompanied by a decrease in the half-value thickness, thickness equivalent lead, and the transmission factor for the synthesized glass samples. © 2025 The Authors

关键词： Germanate glass Hafnium Oxide Optical properties radiation shielding parameters

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Kinesthetic sensing of hole position by 3-finger gripper

Kinesthetic sensing of hole position by 3-finger gripper

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International Conference on Ubiquitous robots and Ambient Intelligence (UrAI)

作者： Myoung-Su Choi dong-Hyuk Lee Jae-Han Park Ji-Hun Bae Robotics R&D Group Korea Institute of Industrial Technology Ansan Repulbic of Korea(South) Applied Robot R&D Departmment Korea Institute of Industrial Technology Ansan Repulbic of Korea(South)

ISBN: (数字)9781728157153

ISBN: (纸本)9781728157160

In this study, we present a novel method for `peg-in-hole' assembly using a multi-joint three-fingered gripper. In previous studies, we have conducted peg-in-hole assembly based on spiral search method, not knowing the exact hole position. However, search time varies greatly depending on the error between the peg and the hole, it was difficult to estimate tact time of the assembly task. In this paper, in order to reduce the search time deviation of the hole, we propose a method that estimating the direction of the hole first before conducting the search motion. direction of the hole is estimated by `kinesthetic sensing' using the fingers grasping the peg. The feasibility of the proposed method has been verified through peg-in-hole assembly experiments using the three-fingered robot gripper.

关键词： robot sensing systems Grippers Navigation Grasping Performance evaluation Estimation

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Elastic deformation Behavior of Single-crystal Gum Metal 11

Elastic Deformation Behavior of Single-crystal Gum Metal

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11th World Conference on Titanium, Ti-2007

作者： Hara, Masashi Kuramoto, Shigeru Takesue, Naohisa Metallic Materials Laboratory Toyota Central R&D Laboratories Inc. Aichi480-1192 Japan Department of Applied Physics Faculty of Science Fukuoka University Fukuoka814-0180 Japan

ISBN: (纸本)9784889034066

The elastic deformation behavior of single-crystal Gum Metal (Ti-36Nb-2Ta-3Zr-0.3O, mass %) has been investigated. The crystal was grown by a floating melting zone method. Since the sample shows a strong tendency to be oxidized as is the case with usual Ti alloys, oxidization was prevented by optimizing the growing conditions. The crystal growth orientation was controlled by using a seed crystal with the desired orientation. The lattice constant and hardness were found to have relationships with the oxygen content. The results of the tensile and compression tests for the single crystal showed that Young's modulus E100 is about 40 GPa, less than E for solution-treated poly-crystals(~70 GPa) and E for cold worked poly-crystals(~50 GPa). The ideal strength and the anisotropic behavior of Young's modulus for Gum Metal were calculated from elastic constants measured by the ultrasonic resonance method. The results essentially agreed with the estimation by first-principles calculations. © Ti-2007 - Proceedings of the 11th World Conference on Titanium. All rights reserved.

关键词： Elastic moduli

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Accurate cogging and linear ripple models for parametrized Feed Forward: A method for splitting up motor ripple into current independent and current dependent fractions

Accurate cogging and linear ripple models for parametrized F...

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International Symposium on Power Electronics, Electrical drives, Automation and Motion

作者： T. L. van Vuure M. Kuiper R&D department Tecnotion B.V. Applied Physics Saxion

ISBN: (纸本)9781509020683

In Iron Core Motors, there are two types of ripple - i.e. position dependent, current dependent parasitic forces. One is only marginally dependent on current (the detent force) and the other is linear with current. Clearly, for formulating accurate detent force models for the purpose of successfully utilizing parametrized Feed Forward techniques it will be crucial to independently determine both fractions of the total ripple. A technique is presented which accomplishes this, both in simulation and in measurement. The potential benefit for a parametrized Feed Forward system is illustrated.

关键词： Feed Forward Cogging detent Force ripple

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Influence of relative Electrode-Electrolyte Movement over Productivity for Silver recovery from diluted Solutions

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Journal of Chemistry and Chemical Engineering 2011年第4期5卷 296-304页

作者： Mirela Ioana Iorga Marius Constantin Mirica Ionel Balcu Nicolae Mirica dan rosu Department of Applied Electrochemistry National Institute of R＆D in Electrochemistry and Condensed Matter-INCEMC-Timisoara Timisoara 300569 Romania

The paper presents the influence of relative electrode-electrolyte movement over productivity for silver ions recovery by electrodeposition from diluted solutions. Wasted photographic fixing agent solution in various concentrations was used. For each concentration three regimes were studied： stationary, electrode rotation with 100 rpm and electrode rotation with 300 rpm. Polarization curves were drawn and working conditions from silver recovery point of view were discussed.

关键词： Metal recovery relative electrode-electrolyte movement electrodeposition mass transport overpotential rotating electrode

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Eddy currents benchmark analysis with COMSOL

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AIP Conference Proceedings 2014年第1期1581卷 2113-2118页

作者： Javier I. Etcheverry daniel H. Ziella Tenaris Siderca R&D Applied Physics Department Campana Buenos Aires B2804MHA Argentina

Several benchmark studies in eddy currents have been proposed by the WFNdEC. Also, there are many analytical exact and approximate solution of interest to quantitatively evaluate the capability of numerical codes to predict the magnitude of the induced currents effects. In this paper we present the results obtained using COMSOL for a representative set of cases of interest. We analyze the accuracy of the results, but also the elements we believe are relevant from the perspective of the NdE specialist (simplicity, computer requirements, things to take into account to get good results, problems faced when solving, failures, etc.).

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Tailoring OH* adsorption strength on Ni/NbO_x for boosting alkaline hydrogen oxidation reaction via oxygen vacancy

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Chinese Chemical Letters 2025年第7期36卷

作者： Yang, Guo Li, Kai Qu, Hanshi Zhu, Jianbing ru, Chunyu Xiao, Meiling Xing, Wei Liu, Changpeng State Key Laboratory of Electroanalytic Chemistry Jilin Province Key Laboratory of Low Carbon Chemistry Power Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China School of Applied Chemistry and Engineering University of Science and Technology of China Hefei 230026 China CAS – HK Joint Laboratory for Hydrogen Energy Changchun 130022 China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China Powertrain Department Gerneral R&D Institude of China FAW Changchun 130013 China

The development of efficient and robust non-precious metal electrocatalyst to drive the sluggish hydrogen oxidation reaction (HOr) is the key to the practical application of anion exchange membrane fuel cells (AEMFC), which relies on the rational regulation of intermediates’ binding strength. Herein, we reported a simple strategy to manipulate the adsorption energy of OH* on electrocatalyst surface via engineering Ni/NbO_x heterostructures with manageable oxygen vacancy (O_v). Theoretical calculations confirm that the electronic effect between Ni and NbO_x could weaken the hydrogen adsorption on Ni, and the interfacial oxygen vacancy tailor hydroxide binding energy (OHBE). The optimized HBE and OHBE contribute to reduce formation energy of water during the alkaline HOr process. Furthermore, in situ raman spectroscopy monitor the dynamic process that OH* adsorbed on oxygen vacancy and react with adjacent H* adsorbed Ni, confirming the vital role of OH* for alkaline HOr process. As a result, the optimal Ni/NbO_x exhibits a remarkable intrinsic activity with a specific activity of 0.036 mA/cm², which is 4-fold than that of pristine Ni counterpart and surpasses most non-precious electrocatalysts ever reported. © 2025

关键词： Anion exchange membrane fuel cells Heterostructure Hydrogen oxidation reaction Hydroxyl binding energy Non-precious metal catalyst Oxygen vacancy

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Point mutations enhance catalytic efficiency of Geobacillus stearothermophilus α-glucosidase: A biochemical characterization study

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International Journal of Biological Macromolecules 2025年第PT 1期315卷 144379页

作者： Suleyman Hekim Arife Kaçıran Ayşe Nur Akmehmet Ali Osman Belduz Kadriye İnan Bektaş Yasin Mamatjan Sabriye Canakci Department of Biology Faculty of Science Karadeniz Technical University 61080 Trabzon Turkey Eryiğit Medical Devices Inc. R&D Department Ankara Turkey Department of Biotechnology Gradute School of Natural and Applied Science Karadeniz Technical University 61080 Trabzon Turkey Department of Molecular Biology and Genetics Faculty of Science Karadeniz Technical University 61080 Trabzon Turkey Faculty of Science Thompson Rivers University 805 TRU Way Kamloops BC V2C 0C8 Canada

α-Glucosidases are important enzymes with a broad spectrum of industrial applications. However, traditional protein engineering often struggles to improve activity without compromising stability and usually demands extensive screening. Here, we targeted the α-glucosidase (AG) from Geobacillus stearothermophilus (Gst), using in silico analyses and literature precedent to select point mutations N61H and N258P. We cloned the mutated gstAG gene into the pET-28a(+) vector and expressed in Escherichia coli . After expressing and purifying both wild-type and mutant enzymes, we performed detailed biochemical assays. Both mutants maintained GstAG's optimum temperature (60 °C) and pH (6.5). However, each displayed enhanced catalytic efficiency: N61H lowered the Michaelis constant ( K ₘ) by 1.5-fold and raised the turnover number ( k cat ) by 1.7-fold relative to the wild type. These results offer a blueprint for engineering α-glucosidases with improved performance, unlocking new commercial and biotechnological applications.

关键词： Catalytic efficiency Heterologous expression Kinetics Point mutation α-Glucosidases

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Meal intention recognition system based on gaze direction estimation using deep learning for the user of meal assistant robot

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Journal of Institute of Control, robotics and Systems 2021年第5期27卷 334-341页

作者： Park, Hyunji Jang, Inhoon Ko, Kwangeun Applied Robot R&D Department Korea Institute of Industrial Technology Korea Republic of Department of Computer Science & Engineering Hanyang University Korea Republic of Industry Academic Cooperation Foundation Hankyong National University Korea Republic of

Care robots that provide dietary supplements to the elderly and the disabled should be able to intelligently interact with the users’ intention to eat in real-time and provide the food they want. To this end, based on deep learning, we have developed a user interface that facilitates the selection of food to be eaten according to six user gaze directions. A single-stage object-detection deep learning model has been implemented as a lightweight, single-stage object-detection deep learning model that can be installed on commercial tablets, and the accuracy of this model was 0.9857. © ICrOS 2021.

关键词： Human robot interaction

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