检索结果-南通市图书馆

Upcycling end of lithium cobalt oxide batteries to electrocatalyst for oxygen reduction reaction in direct methanol fuel cell via sustainable approach

引用

Journal of Energy Chemistry 2023年第7期82卷 148-157,I0004页

作者： Keyru Serbara Bejigo Kousik Bhunia jungho kim Chaehyeon Lee Seoin Back Sang-Jae kim Nanomaterials&System Lab Major of Mechatronics EngineeringFaculty of Applied Energy SystemJeju National UniversityJeju 63243Republic of Korea Nanomaterials&System Lab Major of Mechanical System EngineeringCollege of EngineeringJeju National UniversityJeju 63243Republic of Korea Research Institute of New Energy Industry(RINEI) Jeju National UniversityJeju 63243Republic of Korea Department of Chemical and Biomolecular Engineering Institute of Emergent MaterialsSogang UniversitySeoul 04107Republic of Korea

Recycling spent lithium-ion batteries(SLIBs)has become essential to preserve the environment and reclaim vital resources for sustainable development.The typical SLIBs recycling concentrated on separating valuable components had limitations,including high energy consumption and complicated separation processes.This work suggests a safe hydrometallurgical process to recover usable metallic cobalt from depleted LiCoO_(2)batteries by utilizing citric acid as leachant and hydrogen peroxide as an oxidizing agent,with ethanol as a selective precipitating agent.The anode graphite was also recovered and converted to graphene oxide(GO).The above components were directly resynthesized to cobaltintegrated nitrogen-doped graphene(Co@NG).The Co@NG showed a decent activity towards oxygen reduction reaction(ORR)with a half-wave potential of 0.880 V vs.RHE,almost similar to Pt/C(0.888 V vs.RHE)and with an onset potential of 0.92 V vs.RHE.The metal-nitrogen-carbon(Co-N-C)having the highest nitrogen content has decreased the barrier for ORR since the reaction was enhanced for Co@NG-800,as confirmed by density functional theory(DFT)simulations.The Co@NG cathode catalyst coupled with commercial Pt-Ru/C as anode catalyst exhibits excellent performance for direct methanol fuel cell(DMFC)with a peak power density of 34.7 mW cm^(-2)at a discharge current density of120 m A cm^(-2)and decent stability,indicating the promising utilization of spent battery materials in DMFC applications.Besides,lithium was recovered from supernatant as lithium carbonate by coprecipitation process.This work avoids sophisticated elemental separation by utilizing SLIBs for other renewable energy applications,lowering the environmental concerns associated with recycling.

关键词： Density functional theory(DFT) Direct methanol fuel cell Leaching Nitrogen doping Oxygen reduction reaction Recycling Spent lithium-ion batteries

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

HF SAR image cross-correlation technique for high accuracy orbit positioning

引用

中国科学：物理学、力学、天文学英文版 2011年第5期54卷 978-985页

作者： KOBAYASHI Takao LEE SeungRyeol kim jungho ONO Takayuki Planetary Science Group Korea Institute of Geoscience and Mineral Resources Daejeon 305-350 Korea Shanghai Astronomical Observatory

A novel technique to determine the position of spacecraft orbits is proposed. The technique is based on the cross-correlation function of HF SAR images and is able to determine the relative position of orbits with an accuracy of ～ /4 or better, where is the wavelength of the HF radar pulse at its center frequency. The performance of the proposed technique was confirmed by simulation which was carried out under the condition of design facts of the SELENE LRS mission. The highly accurate orbit positioning enables precise superposition of HF SAR images so that the inherent mirror image ambiguity problem of HF SAR imaging is resolved to obtain a quality SAR image of the HF band. In addition ambitious 2D-SAR processing would be possible when the above accuracy is available.

关键词：合成孔径雷达图像互相关技术高频雷达定位精度高轨道 SELENE 互相关函数 SAR图像

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

日本对华发展援助政策调整解读

引用

经济研究导刊 2013年第10期 187-188页

作者：金晶华 kim jungho 烟台大学经济管理学院山东烟台264005 韩国高丽大学校国际研究生院韩国首尔100101

在国际关系的理论研究和实际操作中,官方发展援助(Official Development Assistance)以其官方背景、政府行为、战略目的等一系列特点,一直是国外援助研究的重要对象。通过分析日本对华发展援助的特点以及冷战后其战略的几次调整,揭示日... 详细信息

在国际关系的理论研究和实际操作中,官方发展援助(Official Development Assistance)以其官方背景、政府行为、战略目的等一系列特点,一直是国外援助研究的重要对象。通过分析日本对华发展援助的特点以及冷战后其战略的几次调整,揭示日本对中国积极推行ODA政策的深层次原因和目的。当今世界格局下,中日关系对亚太地区的影响非常重大,因此,研究长期以来日本对外援助理念对于正确理解和处理中日关系有着重要的意义。

关键词：官方发展援助中日关系调整

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Capillary-force-induced collapse lithography for controlled plasmonic nanogap structures

引用

Microsystems & Nanoengineering 2020年第1期6卷 404-412页

作者： Inki kim jungho Mun Wooseup Hwang Younghwan Yang Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemistry Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea National Institute of Nanomaterials and Technology(NINT) Pohang 37673Republic of Korea

The capillary force effect is one of the most important fabrication parameters that must be considered at the micro/nanoscale because it is strong enough to deform micro/nanostructures.However,the deformation of micro/nanostructures due to such capillary forces(e.g.,stiction and collapse)has been regarded as an undesirable and uncontrollable obstacle to be avoided during fabrication.Here,we present a capillary-force-induced collapse lithography(CCL)technique,which exploits the capillary force to precisely control the collapse of micro/nanostructures.CCL uses electron-beam lithography,so nanopillars with various shapes can be fabricated by precisely controlling the capillary-force-dominant cohesion process and the nanopillar-geometry-dominant collapse process by adjusting the fabrication parameters such as the development time,electron dose,and shape of the nanopillars.CCL aims to achieve sub-10-nm plasmonic nanogap structures that promote extremely strong focusing of light.CCL is a simple and straightforward method to realize such nanogap structures that are needed for further research such as on plasmonic nanosensors.

关键词： capillary structures collapse

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

PIR-based data integrity verification method in sensor network

引用

Journal of Central South University 2014年第10期21卷 3883-3888页

作者： Yong-Ki kim Kwangnam Choi Jaesoo kim jungho Seok Korea Institute of Science and Technology Information 245 DaehangnoYuseong Daejeon 305-806 Korea

Since a sensor node handles wireless communication in data transmission and reception and is installed in poor environment, it is easily exposed to certain attacks such as data transformation and sniffing. Therefore, it is necessary to verify data integrity to properly respond to an adversary's ill-intentioned data modification. In sensor network environment, the data integrity verification method verifies the final data only, requesting multiple communications. An energy-efficient private information retrieval(PIR)-based data integrity verification method is proposed. Because the proposed method verifies the integrity of data between parent and child nodes, it is more efficient than the existing method which verifies data integrity after receiving data from the entire network or in a cluster. Since the number of messages for verification is reduced, in addition, energy could be used more efficiently. Lastly, the excellence of the proposed method is verified through performance evaluation.

关键词：数据完整性传感器网络验证方法 PIR 基础节点处理无线通信数据发送

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Electromagnetic chirality:from fundamentals to nontraditional chiroptical phenomena

引用

Light(Science & Applications) 2020年第1期9卷 550-567页

作者： jungho Mun Minkyung kim Younghwan Yang Trevon Badloe Jincheng Ni Yang Chen Cheng-Wei Qiu Junsuk Rho Department of Chemical Engineering Pohang University of Science and TechnologyPohang 37673Korea Department of Mechanical Engineering Pohang University of Science and TechnologyPohang 37673Korea Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore

Chirality arises universally across many different fields.Recent advancements in artificial nanomaterials have demonstrated chiroptical responses that far exceed those found in natural materials.Chiroptical phenomena are complicated processes that involve transitions between states with opposite parities,and solid interpretations of these observations are yet to be clearly provided.In this review,we present a comprehensive overview of the theoretical aspects of chirality in light,nanostructures,and nanosystems and their chiroptical interactions.Descriptions of observed chiroptical phenomena based on these fundamentals are intensively discussed.We start with the strong intrinsic and extrinsic chirality in plasmonic nanoparticle systems,followed by enantioselective sensing and optical manipulation,and then conclude with orbital angular momentum-dependent responses.This review will be helpful for understanding the mechanisms behind chiroptical phenomena based on underlying chiral properties and useful for interpreting chiroptical systems for further studies.

关键词： materials interpreting momentum

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Artificial Nanoscale Erythrocytes from Clinically Relevant Compounds for Enhancing Cancer Immunotherapy

引用

Nano-Micro Letters 2020年第7期12卷 156-174页

作者： Wenquan Ou Kang Sik Nam Dae Hoon Park jungho Hwang Sae Kwang Ku Chul Soon Yong Jong Oh kim Jeong Hoon Byeon College of Pharmacy Yeungnam UniversityGyeongsan 38541Republic of Korea School of Mechanical Engineering Yonsei UniversitySeoul 03722Republic of Korea College of Korean Medicine Daegu Haany UniversityGyeongsan 38610Republic of Korea School of Mechanical Engineering Yeungnam UniversityGyeongsan 38541Republic of Korea

Because of enhanced e cacy and lower side e ects,cancer immunotherapies have recently been extensively investigated in clinical trials to overcome the limitations of conventional cancer monotherapies.Although engineering attempts have been made to build nanosystems even including stimulus nanomaterials for the e cient delivery of antigens,adjuvants,or anticancer drugs to improve immunogenic cancer cell death,this requires huge R&D e orts and investment for clinically relevant findings to be approved for translation of the nanosystems.To this end,in this study,an air–liquid two-phase electrospray was developed for stable bubble pressing under a balance between mechanical and electrical parameters of the spray to continuously produce biomimetic nanosystems consisting of only clinically relevant compounds[paclitaxel-loaded fake blood cell Eudragit particle(Eu-FBCP/PTX)]to provide a conceptual leap for the timely development of translatable chemo-immunotherapeutic nanosystems.This was pursued as the e cacy of systems for delivering anticancer agents that has been mainly influenced by nanosystem shape because of its relevance to transporting behavior to organs,blood circulation,and cell–membrane interactions.The resulting Eu-FBCP/PTX nanosystems exhibiting phagocytic and micropinocytic uptake behaviors can confer better e cacy in chemo-immunotherapeutics in the absence and presence of anti-PD-L1 antibodies than similar sized PTX-loaded spherical Eu particles(Eu-s/PTX).

关键词： Cancer immunotherapies Air–liquid two-phase electrospray Paclitaxel-loaded fake blood cell Eudragit particle Translatable chemo-immunotherapeutic nanosystems Anti-PD-L1 antibodies

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Elucidating the photoluminescence-enhancement mechanism in a push-pull conjugated polymer induced by hot-electron injection from gold nanoparticles

引用

Photonics Research 2021年第2期9卷 131-141页

作者： DONGKI LEE SE GYO HAN jungho MUN KIHYUK YANG SUNG HYUK kim JUNSUK RHO KILWON CHO DONGYEOP X.OH MUN SEOK JEONG Department of Energy Science Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Chemical Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea Department of Mechanical Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea Research Center for Bio-based Chemistry Korea Research Institute of Chemical Technology(KRICT)Ulsan 44429Republic of Korea

Understanding the photophysical interactions between the components in organic-inorganic nanocomposites is a key factor for their efficient application in optoelectronic devices. In particular, the photophysical study of nanocomposites based on organic conjugated polymers is rare. We investigated the effect of surface plasmon resonance(SPR) of gold nanoparticles(Au NPs) on the photoluminescence(PL) property of a push-pull conjugated polymer(PBDB-T). We prepared the hybrid system by incorporating poly(3-hexylthiophene)-stabilized Au NPs(P3 HT-Au NPs) into PBDB-T. The enhanced and blueshifted PL was observed in the hybrid system compared to PL in a neat PBDB-T system, indicating that the P3 HT chains attached to the Au NPs suppressed charge-transfer from PBDB-T to the Au NPs and relayed the hot electrons to PBDB-T(the band-filling effect).This photophysical phenomenon limited the auto-dissociation of PBDB-T excitons. Thus, the radiative recombination of the excitons occurred more in our hybrid system than in the neat system.

关键词： conjugated system polymer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Whole-genome,transcriptome,and methylome analyses provide insights into the evolution of platycoside biosynthesis in Platycodon grandiflorus,a medicinal plant

引用

Horticulture Research 2020年第1期7卷 1536-1547页

作者： Jungeun kim Sang-Ho Kang Sin-Gi Park Tae-Jin Yang Yi Lee Ok Tae kim Oksung Chung jungho Lee Jae-Pil Choi Soo-Jin Kwon Keunpyo Lee Byoung-Ohg Ahn Dong Jin Lee Seung-il Yoo In-Gang Shin Yurry Um Dae Young Lee Geum-Soog kim Chang Pyo Hong Jong Bhak Chang-Kug kim Personal Genomics Institute Genome Research FoundationOsong 28160Korea Genomics Division National Institute of Agricultural Sciences(NAS)Jeonju 54874Korea Theragen Etex Bio Institute Suwon 16229Korea Department of Plant Science Plant Genomics and Breeding Instituteand Research Institute of Agriculture and Life SciencesCollege of Agriculture and Life SciencesSeoul National UniversitySeoul 08826Korea Department of Industrial Plant Science&Technology Chungbuk National UniversityCheongju 28644Korea Department of Herbal Crop Research National Institute of Horticultural and Herbal ScienceRural Development Administration(RDA)Eumseong 27709Korea Clinomics Inc Ulsan 44919Korea Green Plant Institute Yongin 16954Korea Korean Genomics Center(KOGIC) Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Biomedical Engineering School of Life SciencesUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea

Triterpenoid saponins(TSs)are common plant defense phytochemicals with potential pharmaceutical properties.Platycodon grandiflorus(Campanulaceae)has been traditionally used to treat bronchitis and asthma in East Asia.The oleanane-type TSs,platycosides,are a major component of the P.grandiflorus root extract.Recent studies show that platycosides exhibit anti-inflammatory,antiobesity,anticancer,antiviral,and antiallergy properties.However,the evolutionary history of platycoside biosynthesis genes remains unknown.In this study,we sequenced the genome of P.grandiflorus and investigated the genes involved in platycoside biosynthesis.The draft genome of P.grandiflorus is 680.1 Mb long and contains 40,017 protein-coding genes.Genomic analysis revealed that the CYP716 family genes play a major role in platycoside oxidation.The CYP716 gene family of P.grandiflorus was much larger than that of other Asterid species.Orthologous gene annotation also revealed the expansion ofβ-amyrin synthases(bASs)in P.grandiflorus,which was confirmed by tissue-specific gene expression.In these expanded gene families,we identified key genes showing preferential expression in roots and association with platycoside biosynthesis.In addition,wholegenome bisulfite sequencing showed that CYP716 and bAS genes are hypomethylated in P.grandiflorus,suggesting that epigenetic modification of these two gene families affects platycoside biosynthesis.Thus whole-genome,transcriptome,and methylome data of P.grandiflorus provide novel insights into the regulation of platycoside biosynthesis by CYP716 and bAS gene families.

关键词： properties insight roots

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Enhancement of Toxic Gas Detecting Ability of Film Type Colorimetric Sensor

引用

Journal of Materials Science and Chemical Engineering 2016年第1期4卷 40-45页

作者： Sung Yeol kim Seung Kyun Yoon jungho Ahn Dong June Chung School of Chemical Engineering Sungkyunkwan University Suwon Korea

In this study, we tried to develop the in situ coating methods of hydrophilic polymer solution containing water soluble dye on nonwoven sheet for the colorimetric film sensor. And color change of coated dye according to contact various gas samples (as strong acid and base, chloroform, ammonia and HF) of this dye-coated nonwoven film was examined for the application of chemically toxic materials detecting tools in the actual site of working place without aid of any kinds of detecting devices. By the addition of electron transfer agent (quinone derivatives), quick color change behaviors were observed within 10 seconds under the contact of various toxic gases in general condition(room temperature, 50% humidity).

关键词： Toxic Gas Detection Colorimetric Sensor pH Indicating Dyes Polymer Binder Electron Transfer Reagent

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：