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Arakawa-ku, Japan

Ueka Y.,Ehime University | Matsui M.,ISEKI and Co. | Matsui M.,Utsunomiya University | Inoue E.,Kyushu University | And 3 more authors.
Engineering in Agriculture, Environment and Food | Year: 2012

The flight of separated straws is thought to affect the cleaning wind of a combine harvester. To comprehend the turbulent flow characteristics of the cleaning wind and its passage through the grains, the cleaning wind velocity is measured by particle image velocimetry and laser Doppler velocimetry. The flow of the cleaning wind is blocked by the grains, and therefore the distribution of wind velocity changes. It is found that the energy loss of the cleaning wind is not a result of turbulent flow. The wall friction and the pressure change observed as a result of the shape and the friction loss in the grains are the main considerations while calculating the energy loss of the cleaning wind in combine harvester. Source


Takayama K.,Ehime University | Sarai Y.,Ehime University | Sarai Y.,ISEKI and Co. | Oizumi T.,Ehime University | Nishina H.,Ehime University
Environmental Control in Biology | Year: 2010

Chlorophyll fluorescence is red light emitted from chlorophyll a pigment and hence accurate measurement of this emission allows us to assess photosynthetic functions of the plant. The chlorophyll fluorescence induction imaging measures a chlorophyll fluorescence induction phenomenon. This phenomenon is a dynamic change in chlorophyll fluorescence intensity induced by illuminating plant body with an excitation light at a stable intensity under dark condition. The time course of the chlorophyll fluorescence intensity during this phenomenon is called induction curve. In this study, we developed a chlorophyll fluorescence induction imagining system for whole tomato plants as a first prototype for plant diagnosis in greenhouse. By using this system, we assessed the effects of sunlight exposure treatment, i.e. PPFD 1500 μmol m-2s-1 for 2.5 h, on the photosynthetic functions of a whole tomato plant of 1,1 m high. A substantial transformation of induction curve was observed between before and just after the treatment, but it was recovered in 6 h under dark condition. During the recovery process, the inflection points of P and M, which are the characteristic inflections of an induction curve, showed different behaviour. The M kept lower values for 1.5 h after the sunlight exposure treatment even though the P had been almost recovered. This result suggests that the chlorophyll fluorescence induction imaging, especially concurrent monitoring of the images of P and M inflection points, is useful to detect invisible photosynthetic dysfunctions at whole plant level. Source


Xu K.,ISEKI and Co. | Sasahara H.,Tokyo University of Agriculture and Technology
International Journal of Automation Technology | Year: 2016

Many products are designed with surface textures that enhance the aesthetic and tactile qualities of the product. In this paper, a curved-surface, patch-division milling technique is proposed for creating uniform aligned cutter marks on a curved surface. Previous research demonstrated a ball-end milling technique that divides the surface into small planar patches where each patch is generated by a helical tool path with dimples in uniform alignment. Because the patches are planar, it is impossible to precisely machine a concave or convex surface. However, the technique could only approximate a method for machining curved surfaces. To resolve this issue, curved surface patches were developed to generate the patch directly according to the shape of the targeted curved surface. The dimples are expected to be uniformly aligned on curvedsurface patches. Therefore, the targeted surface should be cut using an appropriate machining condition. According to the test results, the distribution of dimples was the same as the pre-determined distribution. In addition, the dimples were regularly aligned when viewed from a specific angle. This proposed method overcomes the deviation of the dimple’s positions, which is caused by the acceleration–deceleration of the machine tool and the change of the cutting point during five-axis machining. © 2016, Fuji Technology Press. All rights reserved. Source


Morimoto E.,Ishikawa Agriculture and Forestry Research Center | Daikoku M.,Tohoku Agricultural Research Center Shimokuriya gawa Morioka | Ogomi T.,ISEKI and Co. | Saiga M.,ISEKI and Co. | Aoki K.,ISEKI and Co.
Engineering in Agriculture, Environment and Food | Year: 2016

This study observed soil condition in a tsunami-damaged field. An on-the-go soil sensor mounted on rice transplanter was employed for field monitoring. Topsoil depth (TD) and soil fertility value (SFV) were used for field evaluation. A dataset of 17,017 samples for tsunami-damaged and 33,716 samples from on-damaged field were evaluated in this study. Results indicated that standard deviation of TD between tsunami and non-damaged fields showed very little differences. However, average SFV in the tsunami field was greater than three times higher than that of non-damaged field. Especially, high SFV (i.e. 1.2 mS/cm) was observed around the edge of field due to the salt removal operation by using mole drain. © 2016 Published by Elsevier B.V. on behalf of Asian Agricultural and Biological Engineering Association. Source


Takayama K.,Ehime University | Hirota R.,Ehime University | Takahashi N.,Ehime University | Nishina H.,Ehime University | And 4 more authors.
Acta Horticulturae | Year: 2014

The speaking plant approach (SPA) is becoming an indispensable concept to maximize profit of agricultural production in current greenhouses. This concept is defines the optimal plant cultivation conditions should be achieved by monitoring the physiological status of the plants. Chlorophyll fluorescence imaging technique is useful to evaluate the photosynthetic functions of plant without touching. In this study, we developed a chlorophyll fluorescence imaging robot by modifying the chlorophyll fluorescence imaging system developed in our previous study. The primary feature of this robot is the feasible design, automated simple operation and low-cost, for implementation in commercial tomato production greenhouse. A 1.8 m (H) x 0.7 m (W) blue LED panel (λ< 600 nm) illuminates a 1.8 m (H) x 1.0 m (W) area at a distance of 0.5 m from the panel at PPFD of 20-100 μmol m-2 s-1. The chlorophyll fluorescence emission of the illuminated plants was captured by a high weatherresistant CCD camera equipped with a long-pass filter (ë 660 nm). This system images chlorophyll fluorescence induction phenomenon, a dynamic change in chlorophyll fluorescence intensity induced by an excitation light under dark condition and analyses the shape of the induction curve, the time course of the chlorophyll fluorescence intensity during this phenomenon. The shape of the induction curve is characterized with the initial maximum peak (P), the following transient dip (S) and secondary small peak (M). Two parameters such as P/S and M/S, the fluorescence intensities of P or M divided by the fluorescence intensity of S, were calculated to evaluate the shape of the induction curve. These parameters can be used as indices of ability of photosynthetic electron transport. We applied the developed chlorophyll fluorescence imaging robot to grasp a spatial distribution of photosynthetic function of hydroponically-cultivated tomato plants in a semi-commercial greenhouse. The distribution maps of P/S and M/S consisted of 70 measuring points at equally spaced intervals in a 20 m (North-South) x 11 m (East-West) area revealed that there was a heterogeneous distribution of photosynthetic electron transport ability in the greenhouse. Source

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