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Effects of Forest Fire on the Physicochemical Properties of Top Soils of Adjacent Agricultural Land
Yongseon Zhang,Dong-Jin Kim,Hee-Rae Cho,Young-Ho Seo,Hyub-Sung Lee,Soon-Sun Kim 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.2
Combustion of agricultural topsoil leads to reduced organic sources, a transformation of soil structure, a formation of water repellent soil layer, and changes in balance and availability of nutrients. Therefore, in order to evaluate the change in soil environment of adjacent agricultural lands affected by forest fires, we investigated the physicochemical properties of the topsoil of agricultural lands in Goseong and Gangneung, Gangwon Province in 2019. The forest fire damaged agricultural land adjacent to forests do not have sufficient combustion sources like forest land. So there are no root burning, ash penetration, soil structure transformation, and water repellent soil layer, which can cause the soil to be thermally damaged. There was no statistically significant difference in the physical (bulk density, porosity, soil moisture, and soil three phase) and chemical (pH, EC, organic matter, available phosphate, and exchangeable cations) properties of the agricultural land damaged by wildfire and the control agricultural land. Based on this, there appears to be no combustion damage that affects the soil environment of farmland.
Kim, Myeongjin,Hwang, Yongseon,Kim, Jooheon The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.1
<P>Herein, 3D nanohybrid architectures consisting of MnO<SUB>2</SUB> nanoneedles, carbon nanotubes (CNTs) and graphene sheets are fabricated. Nanostructured ternary hybrid papers in which MnO<SUB>2</SUB> nanoneedles formed on the outermost graphene layer and CNTs intercalated between graphene layers by using the amide bonds are fabricated using the direct paper dipping method. The intercalated CNTs can separate the graphene layers and thus create the effective surface area which is associated with large electrochemically active sites as well as form the electronic conductive channel inside the nanohybrid paper. Moreover, the homogeneous dispersion of nanometer-thick MnO<SUB>2</SUB> on the outermost graphene layer can maximize the surface area which can form pores for ion-buffering reservoirs to improve the diffusion rate of electrolyte ions and enable convenient participation in the pseudo-capacitive reaction. These nanostructured ternary hybrid papers exhibit enhanced specific capacitances compared with graphene-only or graphene–CNT papers. The proposed nanohybrid architectures are expected to lay the foundation for the design and fabrication of high-performance electrodes.</P> <P>Graphic Abstract</P><P>Herein, 3D nanohybrid architectures consisting of MnO<SUB>2</SUB> nanoneedles, carbon nanotubes (CNTs) and graphene sheets are fabricated. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cp53488j'> </P>
Kim, Jin Kyu,Ju, Ji Young,Choi, Seul Ki,Unithrattil, Sanjith,Lee, Sun Sook,Kang, Yongku,Kim, Yongseon,Im, Won Bin,Choi, Sungho Elsevier 2018 Journal of Power Sources Vol.378 No.-
<P><B>Abstract</B></P> <P>Electrochemically active CoO/Co<SUB>3</SUB>O<SUB>4</SUB> co-existing microspheres with morphology-inherited porous particles is successfully synthesized via a simple solvothermal method. The as-prepared intermixed composite undergoes a monoxide CoO-preferred conversion reaction with an extremely enhanced capacity retention, ∼905 mA h g<SUP>−1</SUP> after 250 cycles for discharge state, which is 1.6 times higher than the conventional CoO<SUB>x</SUB>-based anodes. Moreover, stable catalytic behavior of the electrocatalysts in Li-air cathodes of the given composites is also demonstrated. We believe that the extraordinarily enhanced electrode performance might be due to the novel pore-tempered microspheres packed with double electrochemically active centers of the CoO/Co<SUB>3</SUB>O<SUB>4</SUB> composite effectively confine the detrimental volume exchange during the reversible cyclic reactions as well as the preserved multiple reactive sites for a reversible Li<SUP>+</SUP> ⇄ LiO<SUB>x</SUB> reaction, which is advantageous for advanced Li rechargeable battery.</P> <P><B>Highlights</B></P> <P> <UL> <LI> <I>In-situ</I> growth of electrochemically active CoO/Co<SUB>3</SUB>O<SUB>4</SUB>composite for Li<SUP>+</SUP>ion. </LI> <LI> Unique electrochemical behavior of pore-embedding CoO/Co<SUB>3</SUB>O<SUB>4</SUB>spherical particles. </LI> <LI> Propose conceptual design of metal oxide composites for the novel electrodematerial. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
경로정보를 이용한 RE-EV의 배터리 충전량 및 동력기반 주행제어 알고리즘
박용선(Yongseon Bak),피재명(Jaemyoung Pi),박선영(Sunyoung Park),장미정(Mijeong Jang),손한호(Hanho Son),최진규(Jingyu Choi),김용광(Yongkwang Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
In this study, a route information based control algorithm was developed for range-extended electric vehicle (RE-EV). The algorithm estimates demanded vehicle power and SOC charging amount using the route information and vehicle dynamic model. In addition, a threshold vehicle demanded power was obtained to improve the energy conversion efficiency by transmitting the power from the range extender to the driving motor directly. To evaluate the performance of the algorithm, a RE-EV performance simulator was developed. It was found that fuel consumption can be reduced compared with the existing control algorithm by the proposed algorithm .