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Operational efficiencies and costs of an arm roll forwarder: A case study at Nasu in Tochigi Prefecture, Japan

Journal of Forestry Research 2013年第3期24卷 577-583页

作者： Kazuhiro Aruga Yuto Otsuka Chikara Nakahata Reiko yamaguchi Masashi Saito Mayu Nagasaki Department of Forest Science Faculty of Agriculture Utsunomiya University350 Mine Utsunomiya 321-8505 Japan Frontier Agriscience and Technology Center Faculty of Agriculture Shinshu UniversityNagano 399-4598 Japan Japan Wood Energy Co. Ltd.Tokyo 198-0036

We investigated a developed arm roll forwarder at Nasu in Tochigi Prefecture, Japan. An arm roll forwarder can only load a steel container that has been fully loaded with logs beforehand, and can later unload such a container. Such a forwarder can shorten the loading and untoading times and improve operational efficiency. We examined two operation systems with an arm roll forwarder and a forwarder. In the first system the loading was done with a grapple-loader. In the second system the loading was done with a processor. The loading times of an arm roll forwarder were significantly tess than those of a forwarder. Because the optimal cycle times （excluding the waiting times for an arm roll for- warder） were significantly reduced, the costs of using an arm roll for- warder are lower, although the loading capacity was small and the hourly operation cost was high. The maximum operational efficiencies varied depending on forwarding distances. The second operation system with an arm roll forwarder exhibited the best operational efficiency within a 1,580-m forwarding distance, and beyond that distance it exhibited the highest operational efficiency when a forwarder was used. Similarly, the cost of operation of the system with an arm roll forwarder was the lowest within a 1,130-m forwarding distance, and beyond that distance the cost was the lowest when using the forwarder. Therefore, the arm roll for- warder is effective within a certain forwarding distance.

关键词： arm roll forwarder steel container operational efficiency cost forwarding distance

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Numerical study of Natural Convection of Magnetic Fluids in a Cubic Cavity with a Heat Generating Object Inside by the Lattice Boltzmann Method

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Advances in Applied Mathematics and Mechanics 2010年第1期2卷 76-85页

作者： Xiao-Dong Niu Hiroshi yamaguchi Xin-Rong Zhang Keisuke Yoshikawa Energy Conversion Research Center Department of Mechanical EngineeringDoshisha UniversityKyoto 630-0321Japan Department of Energy and Resources Engineering College of EngineeringPeking University100871P.R.China

In this article,natural convection of a magnetic fluid in a cubic cavity with a heat generating object inside and under a uniform magnetic field is simulated by the lattice Boltzmann *** obtained from the present simulations are shown to be agreed well with our experimental measurements,and reveal more of effects of the magnetic field on the flow and heat transfer of the magnetic fluids.

关键词： Magnetic fluids natural convection Lattice Boltzmann method

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Boiogito Increases the Synthesis and Secretion of Adiponectin by Promoting Differentiation in Cultured Human Adipocytes

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Health 2023年第12期15卷 1319-1337页

作者： Yuan Gu Ailing Hu Takuji yamaguchi Masahiro Tabuchi Yasushi Ikarashi Hiroyuki Kobayashi Department of Personalized Kampo Medicine Juntendo University Graduate School of Medicine Tokyo Japan

Boiogito (BOT) ameliorates insulin resistance and diabetes in several animal models;however, the underlying mechanisms for these in vivo effects remain unclear. Thiazolidine derivatives, which are peroxisome proliferator-activated receptor γ (PPARγ) agonists for the treatment of type II diabetes, promote adiponectin production by inducing adipocyte differentiation, thereby reducing insulin resistance. This study aimed to evaluate the effect of BOT on adipocyte differentiation using cultured human visceral preadipocytes (HVPAds) compared with the thiazolidine derivative troglitazone (TRG). We investigated the effects of BOT (0.125 - 1 mg/mL) and TRG (10 μM) on the differentiation of adipocytes treated with or without tumor necrosis factor-α (TNF-α: 5 ng/mL). On day 14 of culture, the following adipocyte differentiation marker levels were measured: intracellular lipids, extracellular (i.e., medium) adiponectin, and intracellular differentiation-related genes (PPARγ, CCAAT/enhancer binding protein, adiponectin, differentiation cluster 36, glucose transporter type 4). BOT and TRG increased factors associated with differentiation including lipid, adiponectin, and differentiation-related gene expression levels compared with the controls. The increases in these differentiation markers were inhibited by the PPARγ antagonist GW9662 (20 μM). Furthermore, TNF-α decreased all differentiation marker levels. The decreases in differentiation markers were inhibited by BOT and TRG;however, these inhibitory effects were blocked by GW9662. The results suggest that BOT increases the synthesis and secretion of adiponectin by promoting differentiation similar to TRG. This study is the first to demonstrate that adipocyte differentiation-promoting activity is a mechanism for the beneficial effects of BOT on diabetes and insulin resistance.

关键词： Adipocyte Adiponectin Boiogito Differentiation Troglitazone

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Analysis on the relationship between water resources and environmental change in Northern Thailand

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Global Energy Interconnection 2019年第3期2卷 270-275页

作者： Kensuke yamaguchi Manaskorn Rachakarakij Prasert Reubroycharoen Institute for Future Initiatives The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan Department of Environmental Engineering Chulalongkorn University Phyathai Rd. Pathumwan Bangkok 10330 Thailand Department of Chemical Technology Chulalongkorn University Phyathai Rd. Pathumwan Bangkok 10330 Thailand

How do people perceive environmental change when coping with scarcity? Previous studies on scarcity tend to overlook the aspect of perception. By analyzing repeated water conflicts in northern Thailand, this study she... 详细信息

关键词： Water conflict Water shortage Perception Social power

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Evaluation of Expansion Process to Improve Corrosion Resistance of Copper Tubes with High Residual Carbon on the Inner Surface

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Materials Sciences and Applications 2023年第2期14卷 45-52页

作者： Yuma Kano Itaru Ikeda Takashi Iyasu Yuna yamaguchi Yutaka Yamada Osamu Sakurada Department of Chemistry and Biomolecular Science Faculty of Engineering Gifu University Gifu Japan Dai-Dan Co. Ltd. Saitama Japan Kurita Water Industries Ltd. Tokyo Japan Daiwa Techno Co. Ltd. Gifu Japan

Residual carbon on the inner surface of copper tubes is known to be a cause of pitting corrosion. We showed previously that the rapid filling test was useful to evaluate the pitting corrosion resistance of copper tubes. Immersion tests using the rapid evaluation test solution showed that corrosion occurs on the entire surface of copper tubes with low residual carbon amounts, while those with high residual carbon amounts show pitting corrosion. Therefore, it is necessary to improve the corrosion resistance of copper tubes with high residual carbon amount, which are expected to undergo pitting corrosion. As pitting corrosion occurs when anodes are locally concentrated on part of the metal surface, it has been suggested that anodes be dispersed over the entire surface by the processing of the metal surface. Metal processing methods have various purposes, including changing the shape and properties of metals, and in this case, leading to desirable surface properties (such as expansion and drawing processes). Here, we focused on the expansion process and its effects on corrosion resistance of copper tubes. The results showed that hydraulic expansion has a significant effect on the inner copper surface by improving corrosion resistance as the anode area increases.

关键词： Expansion Process Carbon Film Pitting Corrosion Corrosive Anion the Pitting Corrosion Resistance Test

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Conscious Slower Breathing Predominates Parasympathetic Activity and Provides a Relaxing Effect, in Healthy Japanese Adult Women

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Health 2023年第9期15卷 954-964页

作者： Mami Sakurai Ailing Hu Takuji yamaguchi Masahiro Tabuchi Yasushi Ikarashi Hiroyuki Kobayashi Department of Hospital Administration Graduate School of Medicine Juntendo University Tokyo Japan Department of Personalized Kampo Medicine Graduate School of Medicine Juntendo University Tokyo Japan

Background: The optimal breathing pattern (BP) to effectively regulate autonomic nervous activity is yet to be determined. Objective: We aimed to clarify the effects of four BPs (BP-1, BP-2, BP-3, and BP-4) on autonomic nervous activity and mood changes. Methods: Eleven healthy adult female volunteers performed each BP in a sitting position for 5 min in a resting state. The time required for one breathing for BP-1 (30 breaths/min), BP-2 (20 breaths/min), BP-3 (15 breaths/min), and BP-4 (10 breaths/min) were 2 s, 3 s, 4 s, and 6 s, respectively. The inspiratory/expiratory time of one breathing was 1 s/1 s, 1 s/2 s, 2 s/2 s, and 2 s/4 s. The high-frequency component (HF) and low-frequency component (LF)/HF ratio during and before (control) performing a BP were calculated from heart rate variability data recorded using the wearable biometric information tracer M-BIT. Three mood changes, which are, “pleasure—unpleasure”, “relaxation—tension”, and “sleepiness—arousal”, in the subjects were assessed using the visual analog scale (VAS) before and after performing a BP. Results: Slower breathing induced an increase in HF power and a reduction in LF/HF ratio, indicating increased parasympathetic activity and decreased sympathetic dominance. Furthermore, VAS revealed that slower breathing increased the tendency to feel “pleasure”, “relaxation”, and “sleepiness”. Conclusion: Our results suggest that slower breathing predominates parasympathetic activity in the autonomic nervous system, resulting in a relaxing effect. This result may help lay the foundation for deriving breathing methods that efficiently regulate an individual’s autonomic activity.

关键词： Breathing Autonomic Activity Heart Rate Variability Analysis Visual Analog Scale

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Relationship between Corrosion Form and Elution Behavior of Copper Tubes Surfaces with Different Residual Carbon Amounts

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Materials Sciences and Applications 2022年第12期13卷 595-602页

It was well known that residual carbon on the inner surface of copper tubes was a cause of pitting corrosion, and copper tube surfaces with different residual carbon amount were different corrosion forms. In this study, the relation between corrosion form and elution of copper in immersion tests by accelerated corrosion test solutions was examined. Generally, pitting corrosion that occurs in actual machines was reported to observe chloride ion at the bottom of the pitting corrosion of copper tubes. Energy dispersive X-ray (EDX) mapping analysis indicated that chlorine was concentrated in the upper layer of the samples where copper was not detected under conditions of low residual carbon amount, while chlorine was concentrated under part of the micromounds (including the bottom of the pits) under conditions of high residual carbon amount. It was also suggested that the amount of copper eluted was related to the amount of residual carbon.

关键词： Carbon Film Residual Carbon Amount Pitting Corrosion Corrosive Anion The Pitting Corrosion Resistance Test

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Application of Kelvin Probe to Studies of Fusion Reactor Materials under Irradiation

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Plasma Science and Technology 2005年第4期7卷 2982-2984页

作者：罗广南 K.yamaguchi T.Terai M.Yamawaki Department of Quantum Engineering and Systems Science Graduate School of Engineering The University of Tokyo7-3-1 KongoBunkyo-kuTokyo 113-8656Japan Neutron Science Rearch Center Japan Atomic Energy Research Institute 2-4 ShirakataTokai-muraIbaraki319-1195Japan

Recently, the work function （WF） changes in metallic and ceramic materials to be potentially used in future fusion reactors have been examined by means of Kelvin probe （KP）, under He ion irradiation in high energy （MeV） and / or low energy （500 eV） ranges. The results of polycrystalline Ni samples indicate that the 1 MeV beam only induces decrease in the WF within the experimental fluence range; whereas the irradiation of 500 eV beam results in decrease in the WF firstly, then increase till saturation. A dual layer surface model is employed to explain the observed phenomena, together with computer simulation results by SRIM code. Charges buildup on the surface of lithium ceramics has been found to greatly influence the probe output, which can be explained qualitatively using a model concerning an induction electric field due to external field and free charges on the ceramic surface.

关键词： fusion reactor materials work function irradiation

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心肌淀粉样变性的心肌细胞外容积定量：心脏CT与MRI的比较研究

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国际医学放射学杂志 2024年第2期 253-253页

作者： H.Hayashi S.Oda M.Kidoh S.yamaguchi F.Yoshimura S.Takashio 朱婉秋

摘要目的 CT显示心肌细胞外容积（ECV）是心脏MR(CMR)的替代方法，具有显著的临床应用优势。然而，在心肌淀粉样变性（CA）中分别通过CT和CMR测量ECV的一致

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HIGH CYCLE FATIGUE PROPERTIES OF NICKEL-BASE ALLOY 718

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Acta Metallurgica Sinica(English Letters) 2004年第4期17卷 345-349页

作者： K.Kobayashi K.yamaguchi M.Hayakawa M.Kimura National Institute for Materials Science Tsukuba Ibaraki 305-0047 JapanNational Institute for Materials Science Tsukuba Ibaraki 305-0047 JapanNational Institute for Materials Science Tsukuba Ibaraki 305-0047 JapanNational Institute for Materials Science Tsukuba Ibaraki 305-0047 Japan

The fatigue properties of nickel-base Alloy 718 with fine- and grain-coarse grains were investigated. In the fine-grain alloy, the fatigue strength normalized by the tensile strength was 0.51 at 107 cycles. In contrast, the fatigue strength of the coarse-grain alloy was 0.32 at the same cycles, although the fatigue strengths in the range from 103 to 105 cycles are the same for both alloys. The fracture appearances fatigued at around 106 cycles showed internal fractures originating from the flat facets of austenite grains for both alloys. The difference in fatigue strength at 107 cycles between the fine- and coarse-grain alloys could be explained in terms of the sizes of the facets from which the fractures originated.

关键词： aerospace material fatigue high temperature internal fracture,facet

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