Katsuaki Ohdoi's research while affiliated with Kyoto University and other places

... Because of the unique physical properties, such as small diameter, large specific surface area, stable phase interface, and long residence time in the liquid [2][3][4], they have become a significant improvement measure to improve mass transfer efficiency [5] and reduce operating costs. They are widely used in water treatment [6], nanofluid therapy [7,8], mineral flotation [9,10], and plant growth promotion [11]. ...

... Mimicking natural lighting fluctuations did not have a significant effect on the photosynthetic parameters. Masuda et al. (2022) conducted two growth experiments on leaf lettuce (Lactuca sativa L. var. crispa "Greenwave") with a blue to red LED ratio of 0.33 and DLI of 8.7 mol m Ϫ2 d Ϫ1 . ...

... The results were the same as those of previous studies. Masuda et al. (2021) quantified the effects of alternating and simultaneous red and blue irradiation (100 mmol m Ϫ2 s Ϫ1 ) on the weight and morphology of leaf lettuce. They also investigated the relationship between weight and morphological characteristics. ...

... In forage sorghum, the nitrogen content is a crucial parameter to determine the feed mass. According to new research findings, the chlorophyll content of young sorghum leaves can be used as a biomarker to identify the nitrogen content (Rivai et al., 2020). The chlorophyll content of young sorghum plants can be measured by portable field spectrometers (Carrere et al., 2004). ...

... Hoffmann 21 claimed that blue light with alternating low and high intensity promoted the anthocyanin synthesis and flavonol accumulation in pepper leaves. Shimokawa 22 proposed that alternating R/B light caused increase in lettuce yield, while Jao and Fang 23 found that the biomass of potato plantlets illuminated with alternating R/B light was significantly decreased. The effects of dynamic RB light environment on sugar accumulation in lettuce have scarcely been concerned. ...

... The linear contact model for tire-soil interactions can also be found in other literature [58,64,65,145,161]. Currently, this contact model has been incorporated into some commercial solvers, such as LS-DYNA [99], PFC [59,60], YADE [163], EDEM [121,123] and LIGGGHTS [102], due to simplicity. Based on this model, the bond strength can be introduced to characterize complex contact models for cohesive soils such as the contact and parallel bond models [164][165][166]. ...

... To study the influence of thrust, water content, the shear rate, and the structural parameters of a track shoe on soft ground, Yang Congbin et al. established a finite element model of an eight-tooth mechanism on soft ground and conducted a traction test [10][11][12]. Akira Yokoyama et al. studied the influence of the open space between the tracks on the total traction by using a quasi-two-dimensional track shoe model and the discrete element method [13]. Li Jun et al. used the Mckyes-Ali threedimensional model to analyze the interaction between the baffle and the soil; compared the predicted results, Baker's model, and the measured values; and found that the predicted values obtained by the three-dimensional model were closer to the measured values [14,15]. ...

... From above, alternate lighting is characteristic of creating a light environment where crops are alternately irradiated by different spectral compositions. Molecular mechanisms underlying the regulation of alternate lighting on growth still remained to be discovered, whereas it is widely reported that the stimulating effects of alternate lighting are attributed to positive effects on morphology, metabolism, and photosynthesis efficiency [40,41]. Lettuce cultivated under optimal alternating blue and red light treatment tends to have a higher PA/LA (projected area/leaf area) index; meanwhile, photosynthetic efficiency was significantly enhanced [41]. ...

... With the help of the updated method, the interaction problems between an elastic wheel and a soil terrain on Mars were investigated, and the numerical results were validated by comparison with experimental data. Recently, in order to reduce computational cost, they developed a novel 2D DEM-FEM with interchangeable modeling between FEM and DEM for tire traction analyses [86]. As shown in Fig. 7, the soil region near the tire was firstly discretized into discrete elements, while the rest of the soil in the bin was described via finite elements; for the soil region on which the tire was about to roll, the originally discretized finite elements were adaptively converted to discrete elements to better describe the discontinuous behaviors; in contrast, as for the soil region on which the tire had already rolled, the discretized discrete elements were adaptively converted to finite elements to improve computational efficiency. ...

... Two types of loads were considered, i.e., the self-weight of the modular trailer and the weight of the cargo. For the connections in the model, the steel frame and the hydraulic suspension are connected with the same vertical displacement [50], while hinge connections are used between the axle and the rim, and fixed connections are adopted between the rim and the tire [51]. The surface-to-surface contact is used between the tire and the road surface. ...