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Superior electrocatalytic negative electrode with tailored nitrogen functional group for vanadium redox flow battery

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Journal of Energy Chemistry 2023年第3期78卷 148-157,I0005页

作者： Min gu Kang Wook Ahn Joonhee Kang Shin Ae Song Kiyoung Kim Ju Young Woo Yong-Cheol Jeong Bonwook Koo Dae Soo jung Sung Nam Lim Micro/Nano Scale Manufacturing Group Korea Institute of Industrial Technology143 HanggaulroSangrok-guAnsan-siGyeonggi-do 15588Republic of Korea Department of Energy Systems Engineering Soonchunhyang University22 Soonchunhyang-roShinchang-myeonAsan-siChungcheongnam-do 31538Republic of Korea Department of Nanoenergy Engineering Pusan National UniversityBusan 46241Republic of Korea Department of Nano Fusion Technology Pusan National UniversityBusan 46241Republic of Korea Energy Storage Materials Center Energy&Environmental DivisionKorea Institute of Ceramic Engineering&Technology(KICET)101 Soho-roJinju-siGyeongsangnam-doRepublic of Korea

Development of electrodes with high electrocatalytic activity and stability is essential for solving problems that still restrict the extensive application of vanadium redox flow batteries(VRFBs).Here,we designed a novel negative electrode with superior electrocatalytic activity by tailoring nitrogen functional groups,such as newly formed nitro and pyridinic-N transformed to pyridonic-N,from the prenitrogen-doped *** was experimentally confirmed that an electrode with pyridonic-N and nitro fuctional groups(tailored nitrogen-doped graphite felt,TNGF) has superior electrocatalytic acivity with enhanced electron and mass *** functional theory calulations demonstrated the pyridonic-N and nitro functional groups promoted the adsorption,charge transfer,and bond formation with the vanadium species,which is consistent with expermental *** addition,the V2+/V3+redox reaction mechanism on pyridonic-N and nitro functional groups was estabilised based on density functional theory(DFT) *** TNGF was applied to a VRFB,it enabled enhanced-electrolyte utilization and energy efficiencies(EE) of 57.9% and 64.6%,respectively,at a current density of 250 mA cm^(-2).These results are 18.6% and 8.9% higher than those of VRFB with electrode containing graphitic-N and pyridinicN ***,TNGF-based VRFB still operated with an EE of 59% at a high current density of300 mA cm^(-2).The TNGF-based VRFB exhibited stable cycling performance without noticeable decay of EE over 450 charge-discharge cycles at a current density of 250 mA cm^(-2).The results of this study suggest that introducing pyridonic-N and nitro groups on the electrode is effective for improving the electrochemical performance of VRFBs.

关键词： Tailored nitrogen functional group Pyridonic-N Nitro Negative electrode Density functional theory Vanadium redoxﬂow batteries

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Accelerated biodegradation of iron-based implants via tantalum-implanted surface nanostructures

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Bioactive Materials 2022年第3期7卷 239-250页

作者： Min-Kyu Lee Hyun Lee Cheonil Park In-gu Kang Jinyoung Kim Hyoun-Ee Kim Hyun-Do jung Tae-Sik Jang Department of Materials Science and Engineering Seoul National UniversitySeoul08826Republic of Korea Querrey Simpson Institute for Bioelectronics Northwestern UniversityEvanstonIL60208USA Department of Biomedical-Chemical Engineering Catholic University of KoreaBucheon14662Republic of Korea Department of Biotechnology The Catholic University of KoreaBucheon14662Republic of Korea Department of Materials Science and Engineering Chosun UniversityGwangju61452Republic of Korea

In recent years,pure iron(Fe)has attracted significant attention as a promising biodegradable orthopedic implant material due to its excellent mechanical and biological ***,in physiological conditions,Fe has an extremely slow degradation rate with localized and irregular degradation,which is problematic for practical *** this study,we developed a novel combination of a nanostructured surface topography and galvanic reaction to achieve uniform and accelerated degradation of an Fe *** target-ion induced plasma sputtering(TIPS)technique was applied on the Fe implant to introduce biologically compatible and electrochemically noble tantalum(Ta)onto its surface and develop surface nano-galvanic *** tests revealed that the uniformly distributed nano-galvanic corrosion cells of the TIPS-treated sample(nano Ta-Fe)led to relatively uniform and accelerated surface degradation compared to that of bare ***,the mechanical properties of nano Ta-Fe remained almost constant during a long-term in vitro immersion test(~40 weeks).Biocompatibility was also assessed on surfaces of bare Fe and nano Ta-Fe using in vitro osteoblast responses through direct and indirect contact assays and an in vivo rabbit femur medullary cavity implantation *** results revealed that nano Ta-Fe not only enhanced cell adhesion and spreading on its surface,but also exhibited no signs of cellular or tissue *** results demonstrate the immense potential of Ta-implanted surface nanostructures as an effective solution for the practical application of Fe-based orthopedic implants,ensuring long-term biosafety and clinical efficacy.

关键词： Iron Tantalum Ion implantation Biodegradation Orthopedic implants

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Endovascular treatment of traumatic renal artery pseudoaneurysm with a Stanford type A intramural haematoma:A case report

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World Journal of Clinical Cases 2022年第27期10卷 9760-9767页

作者： Yook Kim Jin Young Lee Jin Suk Lee Jin bong Ye Se Heon Kim Young Hoon Sul Su Young Yoon jung Hee Choi Hanlim Choi Department of Radiology Chungbuk National University HospitalCheongju-si 28644Chungcheongbuk-doSouth Korea Department of Trauma Surgery Chungbuk National University HospitalCheongju-si 28644Chungcheongbuk-doSouth Korea Department of Trauma Surgery College of MedicineChungbuk National UniversityCheongju-si 28644Chungcheongbuk-doSouth Korea Cardiovascular and Thoracic Surgery Chungbuk National University HospitalCheongju-si 28644Chungcheongbuk-doSouth Korea Anesthesiology and Pain Medicine Chungbuk National University HospitalCheongju-si 28644Chungcheongbuk-doSouth Korea Department of Surgery Chungbuk National University HospitalCheongju-si 28644Chungcheongbuk-doSouth Korea

BACKGROUND Aortic intramural hematoma(IMH) associated with aortic branch tear and intramurally located pseudoaneurysm after blunt trauma has not been ***,we report a case of progressive type A aortic IMH associated with a pseudoaneurysm arising from the injured proximal renal artery after blunt *** SUMMARY During logging operations,a 66-year-old man experienced blunt force trauma after being injured by a fallen *** arrived at our trauma center with a left flank pain *** tomography(CT) revealed a pseudoaneurysm arising from the proximal renal artery(localized within the aortic media) and Stanford type A IMH.A covered stent was deployed along the left main renal artery,bridging the pseudoaneurysm and covering the parent artery,successfully excluding the pseudoaneurysm as confirmed using ***,although the degree of the pseudoaneurysm decreased,follow-up CT revealed remnant pseudoaneurysm,likely caused by an ***,a covered stent was additionally installed through the previously deployed covered *** exclusion of the pseudoaneurysm was confirmed using final *** the 7-mo follow-up CT scan,the IMH and pseudoaneurysm completely disappeared with no evidence of stent-related *** Endovascular treatment such as stent-graft placement can be an effective and safe treatment for traumatic renal artery injury.

关键词： Aortic intramural hematoma Blunt trauma Intimomedial tear Renal arterial injury Stent-graft Case report

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Emergence of tunable intersubband-plasmonpolaritons in graphene superlattices

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Advanced Photonics 2023年第2期5卷 62-69页

作者： Minwoo jung Gennady Shvets Cornell University Department of PhysicsIthacaNew YorkUnited States Cornell University School of Applied and Engineering PhysicsIthacaNew YorkUnited States

On-demand modification of the electronic band structures of high-mobility two-dimensional(2D)materials is of great interest for various applications that require rapid tuning of electrical and optical responses of solid-state *** electrically tunable superlattice(SL)potentials have been proposed for band structure engineering of the Dirac electrons in graphene,the ultimate goal of engineering emergent quasiparticle excitations that can hybridize with light has not been *** show that an extreme modulation of one-dimensional(1D)SL potentials in monolayer graphene produces ladder-like electronic energy levels near the Fermi surface,resulting in optical conductivity dominated by intersubband transitions(ISBTs).A specific and experimentally realizable platform comprising hBN-encapsulated graphene on top of a 1D periodic metagate and a second unpatterned gate is shown to produce strongly modulated electrostatic *** find that Dirac electrons with large momenta perpendicular to the modulation direction are waveguided via total internal reflections off the electrostatic potential,resulting in flat subbands with nearly equispaced energy *** predicted ultrastrong coupling of surface plasmons to electrically controlled ISBTs is responsible for emergent polaritonic quasiparticles that can be optically *** study opens an avenue for exploring emergent polaritons in 2D materials with gate-tunable electronic band structures.

关键词： band structure engineering two-dimensional materials polaritons plasmons intersubband transitions

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Plant–pollinator metanetworks in fragmented landscapes: a simulation study

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Ecological Processes 2023年第2期12卷 200-209页

作者： Ehsan Rahimi Chuleui jung Agricultural Science and Technology Institute Andong National University Department of Plant Medicals Andong National University

Background The topology of the plant–pollinator network can be explained by the species' abundance and their random interactions. Plant–pollinator networks can be studied in the context of a landscape, because each patch can accommodate a certain local network. Local populations of pollinators in the landscape can be connected through migration and then constitute a metanetwork that is known as a combination of spatial and ecological networks. In this regard, habitat fragmentation can affect the topology of plant–pollinator metanetworks through changes in the species abundance and limiting their interactions. However, it is not clear what pattern(fragmented or aggregated) of the landscape structure can accommodate networks with a higher degree of *** we created simulated landscapes with different forest proportions scenarios(from 5% to 50% of the total landscape) and degrees of fragmentation. Then, for each landscape, we limited the proportion of pollinators to the forest patch. We assumed that plants and pollinators are randomly distributed around the landscape and interact randomly. We used landscape metrics to measure different aspects of landscape structure and bipartite metrics for calculating the degree of specialization in plant–pollinator *** The statistical relationship between bipartite and landscape metrics showed that the relationship between the topology of plant–pollinator networks and the landscape structure is affected by the forest amount in the landscape and the degree of forest fragmentation. We also found that according to the nestedness and H2(a measure of specialization) metrics, fragmented landscapes contain more general plant–pollinator *** Our findings suggest that fragmented landscapes, characterized by scattered forest patches, can promote higher levels of interaction between limited pollinators and diverse flowers, leading to more general plant–pollinator networks.

关键词： Plant–pollinator metanetwork Habitat fragmentation Simulated landscape Landscape metrics Bipartite metrics

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Effect of In Composition on Two-Dimensional Electron Gas in Wurtzite AlGaN/InGaN Heterostructures

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Chinese Physics Letters 2010年第11期27卷 188-190页

作者： KIM bong-Hwan PARK Seoung-Hwan LEE jung-Hee MOON Yong-Tae Department of Electronics Engineering Catholic University of Daegu Hayang Kyeongsan Kyeongbuk 712-702 R. Korea School of Electrical Engineering and Computer Science Kyungpook National University Daegu 702-701 R. Korea LG Corporate Institute of Technology 16 Woomyeon-dong Seocho-gu Seoul 137-14-0 R. Korea

The effect of In composition on two-dimensional electron gas in wurtzite AlGaN/InGaN heterostructures is theoretically investigated. The sheet carrier density is shown to increase nearly linearly with In mole fraction x, due to the increase in the polarization charge at the AlGaN/InGaN interface. The electron sheet density is enhanced with the doping in the AlGaN layer. The sheet carrier density is as high as 3.7×1013 cm^-2 at the donor density of 10×1018 cm^-3 for the HEMT structure with x=0.3. The contribution of additional donor density on the electron sheet density is nearly independent of the In mole fraction.

关键词： Condensed matter: electrical magnetic and optical Electronics and devices Semiconductors Surfaces interfaces and thin films Condensed matter: structural mechanical & thermal Nanoscale science and low-D systems

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Risk factors for immediate post-operative fatal recurrence after curative resection of hepatocellular carcinoma

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World Journal of Gastroenterology 2006年第1期12卷 99-104页

作者： bong-Wan Kim Young-Bae Kim Hee-jung Wang Myung-Wook Kim Department of Surgery Ajou University School of MedicineWonchon dongYoungtong kuSuwonKyounggi ProvinceSouth Korea Department of Pathology Ajou University School of Medicine.Wonchon dongYoungtong kuSuwonKyounggi ProvinceSouth Korea

瞄准：调查 clinicopathological 风险因素因为肝细胞癌(HCC ) 的立即的手术后的致命的复发，它可以有实际牵连并且贡献高建立对 HCC 复发为外科手术前或手术后的预防措施冒病人的风险。方法：从 1994 年 6 月到 2004 年 5 月，为 HCC ... 详细信息

瞄准：调查 clinicopathological 风险因素因为肝细胞癌(HCC ) 的立即的手术后的致命的复发，它可以有实际牵连并且贡献高建立对 HCC 复发为外科手术前或手术后的预防措施冒病人的风险。方法：从 1994 年 6 月到 2004 年 5 月，为 HCC 收到了药品切除术的 269 个病人被考察。这些病人，在外科以后在 6 瞬间以内表明了弥漫的 intra 肝或多重的全身的周期性的损害的那些被调查(致命的复发组) 。留下的病人被指定为控制组，并且二个组为临床病理风险因素被比较。结果：在考察的 269 个病人之中， 30 个病人在致命的复发组被注册。在后者之中， 20 个病人证明弥漫的 intra 肝的复发类型和 10 显示出的多重全身的复发打字。在致命的复发组和控制组之间的 Multivariate 分析证明那外科手术前的浆液 alpha-fetoprotein (法新社) 水平比 1,000 microg/L 大(P = 0.02；机会比率 = 2.98 ) ，比 6.5 厘米大的肿瘤尺寸(P = 0.03；或 = 2.98 ) ，并且微脉管的侵略的存在(P = 0.01；或 = 4.89 ) 是在致命的复发组的风险因素。有所有三个风险因素的 48.1% 病人和有二个风险因素的 22% 那些在外科以后在 6 瞬间以内经历了致命的复发。结论：为在药品切除术以后的 HCC 的立即的手术后的致命的复发的三个不同风险因素是外科手术前的浆液法新社水平 > 1,000 microg/L，肿瘤尺寸 > 6.5 厘米，和微脉管的侵略。有二的高风险病人或更多的风险因素应该是各种各样的辅助临床的试用的候选人。

关键词：肝细胞癌固化剂临床表现治疗

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ASL Recognition by the Layered Learning Model Using Clustered Groups

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Computer Systems Science & Engineering 2023年第4期45卷 51-68页

作者： jungsoo Shin Jaehee jung Department of Information and Communication Engineering Myongji UniversityYonginKorea

American Sign Language(ASL)images can be used as a communication tool by determining numbers and letters using the shape of the ***,ASL can have an key role in communication for hearing-impaired persons and conveying information to other persons,because sign language is their only channel of *** ASL recognition methods primarily adopt images,sensors,and pose-based recognition techniques,and employ various gestures together with *** study briefly reviews these attempts at ASL recognition and provides an improved ASL classification model that attempts to develop a deep learning method with *** the proposed model,the collected ASL images were clustered based on similarities in shape,and clustered group classification was first performed,followed by reclassification within the *** experiments were conducted with various groups using different learning layers to improve the accuracy of individual image *** selecting the optimized group,we proposed a meta-layered learning model with the highest recognition rate using a deep learning method of image *** proposed model exhibited an improved performance compared with the general classification model.

关键词： American sign language deep learning recognition CNN ResNet clustered group

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A novel visible-light Nd-doped CdTe photocatalyst for degradation of Reactive Red 43:Synthesis,characterization,and photocatalytic properties

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Journal of Rare Earths 2016年第1期34卷 45-54页

作者： Younes HANIFEHPOUR Nazanin HAMNABARD Bamin KHOMAMI Sang Woo JOO bong-Ki MIN Jae Hak jung School of Mechanical Engineering Yeungnam University Department of Chemical and Biomolecular Engineering University of Tennessee Center for Research Facilities Yeungnam University School of Chemical Engineering Yeungnam University

Novel high-efficiency visible-light-sensitive Nd-doped CdTe nanoparticles were prepared with various doping concentra- tions of neodymium ion by a facile hydrothermal method. The reaction products were analyzed via X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, photoelectron spectroscopy （XPS）, and UV-Vis diffuse re- flectance spectroscopy techniques. Red shift was seen in the absorption band edge peak in the UV-Vis absorbance specmun with in- creasing Nd content. The XRD and XPS results confirmed that Nd ions successfully replaced Cd atoms and were incorporated into the crystal lattice of CdTe. SEM and TEM images indicated spherical structure and high crystallinity. Even at a very low Nd/CdTe molar ratio of 2 mol.%, Nd doping could greatly enhance the photocatalytic activity of CdTe. The photocatalytic activity of Nd-doped CdTe nanoparticles was evaluated by monitoring the decolorization of RRed 43 in aqueous solution under visible-light irradiation. The color removal efficiency of Nd0.08Cd0.9eYe and pure CdTe were 83.14% and 14.32% after 100 min of treatment, respectively. Among different amounts of the doping agent, 8 tool.% Nd indicated the highest decolorization. The presence of radical scavengers such as CF, CO3-, SO4〉, and huthanol was found to reduce the decolorization efficiency.

关键词： neodymium cadmium telluride hydrothermal photocatalyst rare earths

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Estimating horizontal scale of fluctuation with limited CPT soundings

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Geoscience Frontiers 2018年第6期9卷 1597-1608页

作者： Jianye Ching Tsai-jung Wu Armin W.Stuedlein Taeho bong Department of Civil Engineering National Taiwan University School of Civil and Construction Engineering Oregon State University

The paper explores the possibility of estimating the horizontal scale of fluctuation(δ_h) with limited *** following conditions are desirable:(1) the CPT depth is large;(2) there are more than two CPTs;(3)the CPT separation distances are distinct and preferably less than 2×δ_h; and(4) the Whittle-Matern auto-correlation model is adopted.

关键词： Geotechnical engineering Site characterization Spatial variability Horizontal scale of fluctuation

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