This paperdeals with the determination of the constitutive model coefficients used in machining simulations. An optimization-based procedure is developed and applied to constitutive model coefficients determination o...
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This paperdeals with the determination of the constitutive model coefficients used in machining simulations. An optimization-based procedure is developed and applied to constitutive model coefficients determination of Ti6Al4V titanium alloy. The procedure is implemented in LS-dyna/LS-Opt software, coupled with Abaqus/Explicit to calculate the force-displacement curve at each iteration, which is required for the optimization-based procedure. The robustness of the procedure to determine the constitutive model coefficients is evaluated by comparing the predicted and measured plastic strain distributions in the samples.
This paper present about the CFd basedrehabilitation project for high specific speed (over 300 m-kW) Francis turbine. The area of rehabilitation was Spiral casing, Stay vane, Guide vane, runner, andrestricteddraft ...
This paper present about the CFd basedrehabilitation project for high specific speed (over 300 m-kW) Francis turbine. The area of rehabilitation was Spiral casing, Stay vane, Guide vane, runner, andrestricteddraft tube (draft elbow). The main goal of this project was to increase the turbine efficiency at all operating range with high operational stability, low noise as well as high cavitation performance. On the development phase of this project was carried out with CFd only (without Model test) to reduce the time of development. On the first step of this project, the shape of all components was optimized to reduce the hydraulic loss and to increase the cavitation performance with steady state CFd. After that, the operational stabilities (ex. Pressure fluctuation) on the partial load and over load point were verified with unsteady CFd. Finally, the field tests were carried out to confirm the performance of new turbine. It was found that the new turbine has excellent performance in efficiency, power output and operational stability (vibration and noise) compared with existing turbine.
The synthesis of highly crystalline mesoporous materials is key to realizing high-performance chemical and biological sensors and optoelectronics. However, minimizing surface oxidation and enhancing the domain size wi...
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The synthesis of highly crystalline mesoporous materials is key to realizing high-performance chemical and biological sensors and optoelectronics. However, minimizing surface oxidation and enhancing the domain size without affecting the porous nanoarchitecture are daunting challenges. Herein, we report a hybrid technique that combines bottom-up electrochemical growth with top-down plasma treatment to produce mesoporous semiconductors with large crystalline domain sizes and excellent surface passivation. By passivating unsaturated bonds without incorporating any chemical or physical layers, these films show better stability and enhancement in the optoelectronic properties of mesoporous copper telluride (CuTe) with different pore diameters. These results provide exciting opportunities for the development of long-term, stable, and high-performance mesoporous semiconductor materials for future technologies.
Cellular protein homeostasis relies on a complex network of protein synthesis, folding, sub-cellular localization, anddegradation to sustain a functional proteome. Since, most of these processes are energy driven, pr...
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Cellular protein homeostasis relies on a complex network of protein synthesis, folding, sub-cellular localization, anddegradation to sustain a functional proteome. Since, most of these processes are energy driven, proteostasis is inescapably afflicted by cellular metabolism. Proteostasis collapse and metabolic imbalance are both linked to aging and age-associateddisorders, yet they have traditionally been studied as a separate phenomenon in the context of aging. In this study, we indicate that reduced proteostasis capacity is a result of a metabolic imbalance associated with age. We observed increased accumulation of L-serine and L-threonine in replicative old cells of S. cerevisiae, indicating an imbalance in amino acid metabolism with replicative aging. replicating this metabolic imbalance in young cells through deletion of serine dependent transcriptional activator, CHA4, resulted in increased aggregation of endogenous proteins along with misfolding prone proteins Guk1-7ts-GFP and Luciferase-GFP in both young and old cells. Aggregate formation in the cha4Δ strain required a functional sensor of mitochondrial dysfunction and an activator of the retrograde signalling gene, rTG2. CHA4 andrTG2 exhibited genetic interaction and togetherregulated mitochondrial metabolism, replicative lifespan, and aggregate formation in young cells, connecting metabolic regulation with proteostasis and aging. Constitutive activation of retrograde signalling through overexpression of rTG2 ordeletion of MKS-1, negative regulator of rtg1-rtg3 nuclear translocation, resulted in fasterresolution of aggregates upon heat shock through rTG3 and was found to be independent of molecular chaperone upregulation.
during the past few years,organic-inorganic hybrid perovskite materials have attracted incredible interest from the photovoltaic community,with certified efficiency now over 20%.Obtaining high-quality electron-and hol...
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during the past few years,organic-inorganic hybrid perovskite materials have attracted incredible interest from the photovoltaic community,with certified efficiency now over 20%.Obtaining high-quality electron-and hole-transporting interfaces in perovskite-baseddevices is crucial for efficient planar perovskite solar
In this paper, we present a head-up display system that displays augmentedreality objects on a vehicle windshield. Vehicle vibration results when the vehicle plies on the road. We propose a position correction method...
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In this paper, we present a head-up display system that displays augmentedreality objects on a vehicle windshield. Vehicle vibration results when the vehicle plies on the road. We propose a position correction method against vehicle vibration for a head-up display system. This method corrects the positions of computer graphic images on the LCd panel of a head-up display by referring to an inclination angle generated from the vehicle vibration. We evaluated this method by capturing the overlay images of augmentedreality objects on a head-up display system.
作者：
Kurosawa, SadaoNakazono, MasahikoHydraulic Machinery Group
Rotating Machine Technology R&D Department Power and Industrial Systems R&D Center Research & Development Div. Toshiba Corporation 20-1 Kansei-cho Tsurumi-ku Yokohama 230-0034 Japan
This paperdescribes the method for analysing the vortex from a trailing edge of the blade with high accuracy using CFd. As for the analysis method, rANS and LES hybrid model, which is a combination of rANS with a low...
This paperdescribes the method for analysing the vortex from a trailing edge of the blade with high accuracy using CFd. As for the analysis method, rANS and LES hybrid model, which is a combination of rANS with a low calculation load and LES with a high calculation load, was used on understanding the turbine-scale phenomenon with a relatively low calculation load. As for the first step its application as a turbine runner, we conducted the case study in which the blade model was fixed in a uniform and we confirmed that the present CFd could be predicted the vortex shedding phenomena, such as power spectra of velocity fluctuations, wake fluctuation, vortex shedding pattern and hydraulic force acting on the blade etc.
Functional composite materials have been applied in various fields, such as conductivity, magnetism, heat conduction, and as structural materials. Many functional composite materials exhibit an improved performance by...
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