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Satoru YAMAGUCHI,Takuya MOTOSUGI,Ryo UCHIYAMA,Yoshihiko TAKAHASHI,Takeharu HAYASHI 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
Global population growth and the ongoing climate crisis pose immense risk to the stable food supplies in the future. We have developed a small hydroponic plant cultivation system to ensure even in extreme circumstances. To build a sustainable system, we have utilized an LED lighting system together with conserved energy generated by sunlight. Such hydroponic plant cultivation systems have to operate at an affordable yet efficient principle. In this paper, we examine experimental results of the relationship between LED energy consumption and plant growth in a hydroponic plant cultivation system. LED light intensity directly correlates to electrical power consumed. Energy consumption is the result of electrical power consumed over a period of time. Three experiments with varying conditions utilizing constant electrical energy consumption were conducted. Case-1: Electric power is kept low and the lighting duration is long; Case-2: the electric power is set to medium and the lighting duration is medium; Case-3: the electric power is large and the lighting duration is short. As a result of evaluating the weight of grown lettuces, it was found that lettuce growth is excellent in Case-1. It means that the longer the LED irradiation duration, the better the plant growth even under the same energy consumption conditions.
Small Indoor Hydroponic System with Renewable Energy
Satoru YAMAGUCHI,Yoshihiko TAKAHASHI,Takeharu HAYASHI 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
There is a concern about the food crisis due to worldwide population increase and the future rise in food prices. The United Nations has predicted that the world population will increase to 1.5 times current levels by 2100. It is therefore preferable to realize local food production for local consumption. We are developing a small indoor vegetable hydroponic system for household use, which uses sustainable energies, such as solar, wind, and hydrogen power. We have developed a hybrid energy control system with a fuel cell and a lead acid battery. The developed control system optimally switches the energy flow using a DCDC converter depending on the energy situation. We have conducted experiments using a small hydroponic system to determine the environmental situation of the lettuce cultivation process. This paper will explain the developed hybrid energy control system and the results of the vegetable growth process.
Yamaguchi, Ryuichi,Ito, Satoru,Lee, Byung Sun,Hiroto, Satoru,Kim, Dongho,Shinokubo, Hiroshi Wiley (John WileySons) 2013 Chemistry, an Asian journal Vol.8 No.1
<P>We have demonstrated that the iridium-catalyzed direct borylation of hexa-peri-hexabenzocoronene (HBC) enables regioselective introduction of boryl groups to the para-, ortho-, and meta-substituted HBCs in high yields. The boryl groups have been transformed into various functionalities such as hydroxy, cyano, ethynyl, and amino groups. We have elucidated that the substituents significantly influence the photophysical properties of HBCs to enhance fluorescence quantum yields. DFT calculations revealed that the origin of the substituent effect is the lift in degeneracy in the frontier orbitals by an interaction with electron-donating and electron-withdrawing substituents at the para- and ortho-positions. The change in molecular orbitals results in an increase of the transition probability from the S(0)S(1) states. In addition, the two-photon absorption cross-section values of para-substituted HBCs are significantly larger than those of ortho- and meta-substituted HBCs.</P>
Satoru Muto,Kousuke Kitamura,Takeshi Ieda,Fumitaka Shimizu,Masayoshi Nagata,Shuji Isotani,Hisamitsu Ide,Raizo Yamaguchi,Shigeo Horie 대한비뇨의학회 2017 Investigative and Clinical Urology Vol.58 No.3
Purpose: Robot-assisted radical cystectomy (RARC) was originally intended to replace open radical cystectomy (ORC) as a minimally invasive surgery for patients with invasive bladder cancer. The purpose of this study was to evaluate the advantages of robotic surgery, comparing perioperative and oncologic outcomes between RARC and ORC. Materials and Methods: Between June 2012 and August 2016, 49 bladder cancer patients were given a radical cystectomy, 21 robotically and 28 by open procedure. We compared the clinical variables between the RARC and ORC groups. Results: In the RARC group, the median estimated blood loss (EBL) during cystectomy, total EBL, operative time during cystectomy, and total operative time were 0 mL, 457.5 mL, 199 minutes, and 561 minutes, respectively. EBL during cystectomy (p<0.001), total EBL (p<0.001), and operative time during cystectomy (p=0.003) in the RARC group were significantly lower compared with the ORC group. Time to resumption of a regular diet (p<0.001) and length of stay (p=0.017) were also significantly shorter compared with the ORC group. However, total operative time in the RARC group (median, 561 minutes) was significantly longer compared with the ORC group (median, 492.5 minutes; p=0.015). Conclusions: This Japanese study presented evidence that RARC yields benefits in terms of BL and time to regular diet, while consuming greater total operative time. RARC may be a minimally invasive surgical alternative to ORC with less EBL and shorter length of stay.
Curing Reaction Kinetics of Epoxy/Amine at a Quartz Interface
Ko Yamaguchi,Daisuke Kawaguchi,Satoru Yamamoto,Keiji Tanaka 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
The chemical reaction between epoxy and amine compounds at a solid interface is crucial for the manifestation of the adhesion strength. Here we examined the curing reaction kinetics of epoxy phenol novolac and 4,4"-diaminodiphenyl sulfone at a quartz interface using sum frequency generation spectroscopy, and compared it with the bulk one measured by Fourier-transform infrared spectroscopy. A reaction rate constant (k) was much larger at the quartz interface than in the bulk. While the apparent activation energy at the quartz interface obtained from the Arrhenius plot was identical to the bulk value, the frequency factor (A) at the quartz interface was approximately 5.8 times larger than the bulk one. The results could be explained in terms of the peculiar interfacial aggregation states in which adsorbed epoxy and amine molecules were well-oriented and more closely packed.
Dynamic Structure of Bacteriorhodopsin Revealed by $^{13}C$ Solid-state NMR
Saito, Hazime,Yamaguchi, Satoru,Tuzi, Satoru Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
We demonstrate here a dynamic structure of bacteriorhodopsin (bR) as revealed by $^{13}$ C NMR studies on [3_$^{13}$ C]_,[1-$^{13}$ C]Ala- and/or Val-labeled wild type and a variety of site-directed mutants at ambient temperature. For this purpose, well-resolved (up to twelve) I$^{13}$ C NMR peaks were assigned with reference to the displacement of peaks due to the conformation-dependent I$^{13}$ C chemical shifts and reduced peak-intensities due to site-directed mutations. Revealed bR structure was not rigid as anticipated from 2D crystals of hexagonal array but a dynamically heterogeneous, undergoing a variety of local fluctuations depending upon specific site with frequency range of 10$^2$ -10$^{8}$ Hz. In particular, dynamics- dependent suppression of peaks turned out to be very sensitive to the motion of 10$^{-4}$ s and 10$^{-5}$ s interfered with frequency of magic angle spinning and proton decoupling, respectively. It is also noteworthy that such dynamic feature is strongly dependent upon the manner of 2D crystalline packing: $^{13}$ C NMR peaks of monomeric bR yielded either highly broadened or completely suppressed signals, depending upon the type of $^{13}$ C-labeled amino-acid residues.
Solar Power Generation for Compact Hydroponic Plant Cultivation System
Ryo UCHIYAMA,Satoru YAMAGUCHI,Yoshihiko TAKAHASHI 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
In light of recent trends related to global population growth and climate change, our team took on a task of developing a compact hydroponic plant cultivation system in order to provide a stable food supply. The system we are developing uses sustainable energy and does not rely on traditional methods of fossil fuel power. With our system, plants grow utilizing sunlight and when it becomes unavailable, conserved energy stored on-site is used to assist plant growth with an LED lighting system. Energy conservation patterns and amounts are calculated by assessing meteorological data by obtaining data from JMA (Japan Meteorological Agency). In this paper the process of estimating the appropriate amounts of conserved energy using weather data, data obtained from solar power generation experiments, assessment of weather forecast reliability and compatibility with solar power generation results are described.
Battery Remaining Charge Estimation for Small Hydroponic Plant Cultivation System
Takuya MOTOSUGI,Satoru YAMAGUCHI,Yoshihiko TAKAHASHI 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
Continuing population growth and climate shift worldwide has introduced additional risks to our civilization. Our team set out to confront the risk of potential malnutrition of future generations. We have developed a system that utilizes sustainable energy for the purpose of agriculture. Our system utilizes sunlight radiation for energy storing based on a model that incorporates governmental irradiation forecast data. This energy is then used to supplement plant growth. Energy conservation and storage is assisted by an on-site battery that utilizes a method of conservation estimate to accommodate the ever-changing weather conditions which allows for powering the LED light units for plant irradiation. This paper talks about the determination method of a battery SOC (State of Charge) and the simplification of the process based on experiments conducted with a Nickel-Hydrogen battery unit.
2,5-Thienylene-Bridged Triangular and Linear Porphyrin Trimers
Song, Jianxin,Jang, So Young,Yamaguchi, Shigeru,Sankar, Jeyaraman,Hiroto, Satoru,Aratani, Naoki,Shin, Jae-Yoon,Easwaramoorthi, Shanmugam,Kim, Kil Suk,Kim, Dongho,Shinokubo, Hiroshi,Osuka, Atsuhiro WILEY-VCH Verlag 2008 Angewandte Chemie Vol.47 No.32
<B>Graphic Abstract</B> <P>A question of shape: Palladium-catalyzed cross-coupling of borylporphyrins has led to the synthesis of a β-to-β thienylene-bridged porphyrin dimer and two types of trimer (see picture; gray C; white H, pink Ni, yellow S, blue N). The ladderlike trimer exhibits a very large two-photon absorption cross-section (17 300 GM) at 800 nm, while that of the triangular trimer is moderate in comparison (8600 GM). <img src='wiley_img/14337851-2008-47-32-ANIE200802026-content.gif' alt='wiley_img/14337851-2008-47-32-ANIE200802026-content'> </P>