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Geometric shape features extraction using a steady state partial differential equation system
Takayuki Yamada 한국CDE학회 2019 Journal of computational design and engineering Vol.6 No.4
A unified method for extracting geometric shape features from binary image data using a steady-state partial differential equation (PDE) system as a boundary value problem is presented in this paper. The PDE and functions are formulated to extract the thickness, orientation, and skeleton simultaneously. The main advantage of the proposed method is that the orientation is defined without derivatives and thickness computation is not imposed a topological constraint on the target shape. A one-dimensional analytical solution is provided to validate the proposed method. In addition, two-dimensional numerical examples are presented to confirm the usefulness of the proposed method.
( Daisuke Yamada ),( Tomoaki Nishikawa ),( Takuro Yoshikawa ),( Takayuki Kawai ),( Norihiro Kori ),( Mina Kobayashi ),( Masashi Kodan ),( Kohei Seto ),( Kumiko Yamashita ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
A heavy rainfall in July 2018 caused sediment disasters in West Japan. In this disaster, some debris flow were occured on slopes that were not recognized the potential of the occurence of sediment disasters. In this report, based on the results of the sediment disaster emergency survey conducted in several cities in West Japan, we will report the distribution and examples of slopes where these disasters occurred. In addition, regarding the occurrence of debris flow, the features related to topography and weather were examined. In Japan, the hazards of sediment disasters are recognized based on whether the topography of the slope has the same conditions as the topography of sediment disasters that occurred in the past. In this report, we focused on the debris flow occured on the slope that was not recognized as a valley where the debris flow occurs(the valley depth is wider than the valley width). As a result of this survey, we were able to understand the characteristics of the debris flow that occurred at a slope that was not recognized dangerous of sediment disaster. We believe that this report will help improve the warning and evacuation system for future sediment disasters in Japan.
Uematsu, Yasushi,Sone, Takayuki,Yamada, Motohiko,Hongo, Takeshi Techno-Press 2002 Wind and Structures, An International Journal (WAS Vol.5 No.6
The main purpose of this study is to discuss the design wind loads for the structural frames of single-layer latticed domes with long spans. First, wind pressures are measured simultaneously at many points on dome models in a wind tunnel. Then, the dynamic response of several models is analyzed in the time domain, using the pressure data obtained from the wind tunnel experiment. The nodal displacements and the resultant member stresses are computed at each time step. The results indicate that the dome's dynamic response is generally dominated by such vibration modes that contribute to the static response significantly. Furthermore, the dynamic response is found to be almost quasi-static. Then, a series of quasi-static analyses, in which the inertia and damping terms are neglected, is made for a wide range of the dome's geometry. Based on the results, a discussion is made of the design wind load. It is found that a gust effect factor approach can be used for the load estimation. Finally, an empirical formula for the gust effect factor and a simple model of the pressure coefficient distribution are provided.
Chen, Wen-Tong,Yamada, Yusuke,Liu, Guang-Ning,Kubota, Akira,Ichikawa, Takayuki,Kojima, Yoshitsugu,Guo, Guo-Cong,Fukuzumi, Shunichi Royal Society of Chemistry 2011 Dalton transactions Vol.40 No.48
<P>The crystal structure of an N<SUB>2</SUB>-encapusulated MOF, which is stable under open-air conditions at ambient temperature, was determined by single-crystal X-ray diffraction at 123 K. The crystal MOF of [HSm{V<SUP>IV</SUP>O(TPPS)}]<SUB><I>n</I></SUB> designed to have 1-D channels periodically constricted by porphyrins planes adsorbed N<SUB>2</SUB> at 77 K. The adsorbed N<SUB>2</SUB> molecules remained in the 1-D channels even after warming to ambient temperature. The single-crystal structure of [HSm{V<SUP>IV</SUP>O(TPPS)}]<SUB><I>n</I></SUB>⊃N<SUB>2</SUB> determined by X-ray diffraction indicated that N<SUB>2</SUB> molecules trapped in the constricted parts block other N<SUB>2</SUB> molecules in 1-D channels from escaping from the MOF. Such a unique encapsulation mode provides a promising approach toward designing novel MOFs with high gas storage capacity at ambient temperature.</P> <P>Graphic Abstract</P><P>The shrinking of a channel window to fit the size of stopper molecules enables encapsulation of adsorbates in the 1-D channels. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1dt10956a'> </P>
Evaluation of operational characteristics of vertical type incinerator
( Kohei Yamanaka ),( In-hee Hwang ),( Takayuki Matsuo ),( Yasumasa Tojo ),( Toshihiko Matsuto ),( Yuji Yamada ),( Ryoji Sameshima ) 한국폐기물자원순환학회(구 한국폐기물학회) 2017 한국폐기물자원순환학회 심포지움 Vol.2017 No.1
Vertical type incinerator is one of unique incinerators. Wastes are fed at the hopper of upper side of reactor and slowly flow the bottom where the bottom ash is withdrawn. Combustion air less than theoretical one is injected through the bottom of furnace. In their downward movement, the wastes undergo the following process such as drying, pyrolysis, and combustion. Combustible gas that is generated in pyrolysis zone and moves to upward which is burned efficiently in the combustion chamber by supplying sufficient secondary combustion air. As advantages of vertical type incinerator, there are high responsiveness to diverse wastes, high combustion efficiency, and less generation of exhaust gas compared with a conventional stoker type incinerator. However, the utilization record of the vertical type incinerator is few, so there is not enough information to evaluate its operation performance from the engineering point of view. In this work, it aimed at elucidating the material and energy balance, combustion stability, and environmental safety for operating two vertical type incinerators. Annual discharge amounts of exhaust gas and ash, consumption amounts of fuel and electric power, and utilization amounts of chemicals such as slaked lime and activated carbon of per ton of waste were determined based on annual reports obtained from two facilities in Nagayo (54t/d) and Ito (42t/d) respectively. These values were compared with statistical data obtained from questionnaire survey on conventional incinerators performed in 2012 and 2015. For confirmation of combustion characteristics of waste in furnace, vertical distributions of gas concentration and total carbon in the waste layer were measured. To evaluate whether the waste incineration is done stable or not, continuous monitoring data of carbon monoxide concentration in flue gas was obtained. Moreover, bottom ashes were sampled for three days to measure ignition loss. On the other hand, daily average concentrations of harmful substances in exhaust gas such as NOx, SOx, CO, HCl, DXN at stack was also obtained. In the evaluation of discharge of exhaust gas and ash, consumption of fuel and electric power, and chemicals utilization, the surveyed two vertical incinerators showed above-average operational performance compared to conventional incinerators. From the variation of gas concentrations such as H<sub>2</sub>, CO, CO<sub>2</sub>, hydrocarbons in furnace, the vertical distribution of dry, pyrolysis, and char combustion zone was confirmed from the top to bottom of waste layer. Though it was found that 1 h moving average concentration of CO instantaneously sometimes exceeded 100 ppm in flue gas, its frequency was lower than that of conventional stoker type incinerator. However, there were relatively high Pb leaching samples in the leaching test of Pb and Cd of bottom ash. It is necessary to investigate whether it is the influence of the combustion characteristics of the vertical type incinerator.
Kim, Seon-Hee,Yang, JiYoung,Park, Jongsun,Yamada, Takayuki,Maki, Masayuki,Kim, Seung-Chul MDPI AG 2019 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.20 No.19
<P>Symplocarpus, a skunk cabbage genus, includes two sister groups, which are drastically different in life history traits and thermogenesis, as follows: The nonthermogenic summer flowering S. nipponicus and thermogenic early spring flowering S. renifolius. Although the molecular basis of thermogenesis and complete chloroplast genome (plastome) of thermogenic S. renifolius have been well characterized, very little is known for that of S. nipponicus. We sequenced the complete plastomes of S. nipponicus sampled from Japan and Korea and compared them with that of S. renifolius sampled from Korea. The nonthermogenic S. nipponicus plastomes from Japan and Korea had 158,322 and 158,508 base pairs, respectively, which were slightly shorter than the thermogenic plastome of S. renifolius. No structural or content rearrangements between the species pairs were found. Six highly variable noncoding regions (psbC/trnS, petA/psbJ, trnS/trnG, trnC/petN, ycf4/cemA, and rpl3/rpl22) were identified between S. nipponicus and S. renifolius and 14 hot-spot regions were also identified at the subfamily level. We found a similar total number of SSR (simple sequence repeat) motifs in two accessions of S. nipponicus sampled from Japan and Korea. Phylogenetic analysis supported the basal position of subfamily Orontioideae and the monophyly of genus Symplocarpus, and also revealed an unexpected evolutionary relationship between S. nipponicus and S. renifolius.</P>