检索结果-南通市图书馆

Synergistic passivation of MAPbI_(3) perovskite solar cells by compositional engineering using acetamidinium bromide additives

引用

Journal of Energy Chemistry 2021年第8期30卷 755-762,I0016页

作者： Kyungeun Jung Weon-Sik Chae jae won choi Ki Chul Kim Man-Jong Lee Department of Chemistry Konkuk University143-701 SeoulSouth Korea Department of Advanced Technology Fusion Konkuk University143-701 SeoulSouth Korea Analysis Research Division Daegu CenterKorea Basic Science Institute702-701 DaeguSouth Korea Division of Chemical Engineering Konkuk University05029 SeoulSouth Korea

For the global commercialization of highly efficient and stable perovskite solar cells(PSCs),it is necessary to effectively suppress the formation of various defects acting as nonradiative recombination sources in perovskite light-harvesting *** defects between the charge-selective layer and the perovskite are easily formed in the solution process used to fabricate perovskite *** addition,owing to the difference in thermal expansion coefficients between the substrate and the perovskite film,internal residual tensile stress inevitably occurs,resulting in increased nonradiative ***,a simple compositional engineering scheme for realizing efficient and stable PSCs,which incorporates acetamidinium bromide(AABr)as an additive into the MAPbI_(3) lattice,is *** an additive,AABr has been found to provide synergistic multiple passivation for both internal and interfacial *** was found to effectively release the tensile strain of the MAPbI_(3) film by forming a structure stabilized by NH-I hydrogen bonds,as evidenced by calculations based on density functional theory(DFT).Furthermore,the incorporated AABr additives created a charge carrier recombination barrier to enhance charge collection capability by reducing interfacial ***,a power conversion efficiency(PCE)of 20.18%was achieved using a planar device employing AABr-incorporated MAPbI_(3).This was substantially higher than the 18.32% PCE of a pristine MAPbI_(3)-based ***,unencapsulated PSCs using AABr-incorporated MAPbI_(3) absorbers exhibited excellent long-term stability,maintaining>95% of initial PCE up to 1200 hours in ambient air.

关键词： Acetamidinium bromide Planar perovskite solar cell Tensile stress Interface passivation Recombination barrier

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

A flexible electromagnetic interference shielding film coated with a hybrid solder-magnetic powder mixture on a PET substrate

引用

Journal of Materiomics 2018年第4期4卷 390-401页

作者： jae Hyang Lee Dong Seok Kang Sang Hoon Kim Min-Jung Son jae won choi Dae Keun choi Joon-Phil choi Clodualdo Aranas Jr Metal 3D Printing Convergence Research Team Korea Institute of Machinery and Materials156 Gajeongbuk-roYuseong-guDaejeon34103Republic of Korea Metal Powder Department Korea Institute of Materials Science797 Changwon-daeroSeongsan-guChangwon-siGyeongsangnam-do51508Republic of Korea Digital Manufacturing Process Group Korea Institute of Industrial Technology113e58 Seohaean-roSiheung-siGyeonggi-do15014Republic of Korea Department of Printed Electronics Korea Institute of Machinery and Materials156 Gajeongbuk-roYuseong-guDaejeon34103Republic of Korea Department of Mining and Materials Engineering McGill University3610 University StreetMontrealQuebecH3A 0C5Canada Mechanical Engineering University of New Brunswick15 Dineen DriveFrederictonNew BrunswickE3B 5A3Canada

A flexible electromagnetic interference(EMI)shielding film was innovatively fabricated using both low melting temperature solder arrays and amorphous soft magnet particulates consolidated on a polyethylene terephthalate(PET)***,the IneSneBi solder arrays presented a low melting point of 99.4C,which enabled attachment to the heat-sensitive plastic substrate without any thermal damage,and a low electrical resistivity of 14.1 mU cm,making them very effective at interrupting EM ***,the solder arrays with a high thermal conductivity of 61.2 W/(m$K)at 298.15 K were also useful as a thermal conductor for a heat ***,the solder arrays provide efficient electrical and thermal channels for electron transport induced by abruptly or consistently created EM waves due to suddenly turning on and the long term operation of electronics,***,the Fe-based magnetic particulates were added and resulted in effective saturation magnetization of 161.1 emu/g,remanence of 2.9 emu/g,and coercivity of 12.5 G,thus were able to disturb the EM pathway because of their soft magnetic ***,the hybrid EMI shielding film with exceptionally high electrical and thermal conductivity and superior soft magnetic properties provided remarkable shielding effectiveness of 102.5 dB at 10.2 GHz.

关键词： Flexible EMI shielding film PET substrate Solder arrays Magnetic particulates

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

Influence of a UV-ozone treatment on amorphous SnO_(2) electron selective layers for highly efficient planar MAPbI3 perovskite solar cells

引用

Journal of Materials Science & Technology 2020年第24期59卷 195-202页

作者： Kyungeun Jung Du Hyeon Kim jaemin Kim Sunglim Ko jae won choi Ki Chul Kim Sang-Geul Lee Man-Jong Lee Department of Advanced Technology Fusion Konkuk UniversitySeoul05029Republic of Korea a Department of Chemistry Konkuk UniversitySeoul05029Republic of Korea Department of Mechanical Design and Production Engineering Konkuk UniversitySeoul05029Republic of Korea Division of Chemical Engineering Konkuk UniversitySeoul05029Republic of Korea Daegu Center Korea Basic Science InstituteDaegu41566Republic of Korea

The effect of ultraviolet-ozone(UVO)irradiation on amorphous(am)SnO_(2) and its impact on the photoconversion efficiency of MAPbI3-based perovskite solar cells were investigated in *** treatment was found to increase the amount of chemisorbed oxygen on the am-SnO_(2) surface,reducing the surface energy and contact *** changes in the am-SnO_(2) surface lowered the Gibbs free energy for the densification of perovskite films and facilitated the formation of homogeneous perovskite *** addition,the Fermi energy of the UVO-treated am-SnO_(2) shifted upwards to achieve an ideal band offset for MAPbI3,which was verified by theoretical calculations based on the density functional *** achieved a champion efficiency of 19.01% with a statistical reproducibility of 17.01±1.34% owing to improved perovskite film densification and enhanced charge transport/extraction,which is considerably higher than the 13.78±2.15% of the ***,UVO-treated,am-SnO_(2)-based devices showed improved stability and less hysteresis,which is encouraging for the future application of up-scaled perovskite solar cells.

关键词： UV-ozone Amorphous SnO_(2) Electron selective layers Planar perovskite solar cells Hysteresis

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

Varifocal occlusion in an optical see-through near-eye display with a single phase-only liquid crystal on silicon

引用

Photonics Research 2024年第4期12卷 833-853页

作者： WOONGSEOB HAN jae-won LEE JUNG-YEOP SHIN MYEONG-HO choi HAK-RIN KIM jae-HYEUNG PARK Department of Electrical and Computer Engineering Inha University100 Inha-roMichuhol-guIncheon 22212Republic of Korea School of Electronic and Electrical Engineering Kyungpook National University80 Daehak-roBuk-guDaegu 41566Republic of Korea School of Electronics Engineering Kyungpook National University80 Daehak-roBuk-guDaegu 41566Republic of Korea Department of Information and Communication Engineering Inha University100 Inha-roMichuhol-guIncheon 22212Republic of Korea

We propose a near-eye display optics system that supports three-dimensional mutual *** exploiting the polarization-control properties of a phase-only liquid crystal on silicon (LCoS),we achieve real see-through scene masking as well as virtual digital scene imaging using a single *** depth control of the real scene mask and virtual digital image is also achieved by using a focus tunable lens (FTL) pair of opposite *** proposed configuration using a single LCoS and opposite curvature FTL pair enables the self-alignment of the mask and image at an arbitrary depth without distorting the see-through view of the real *** verified the feasibility of the proposed optics using two optical benchtop setups:one with two off-the-shelf FTLs for continuous depth control,and the other with a single Pancharatnam–Berry phase-type FTL for the improved form factor.

关键词： optics crystal phase

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

Improved Cycle Properties of FeS_2 Cathode Material with Metallic Additives

引用

材料科学与工程学报 2007年第6期25卷 910-913页

作者： jae-won choi jae-Kwang Kim Gouri Cheruvally Jou-Hyeon Ahn Ki-won Kim Hyo-Jun Ahn Dong-Kyu Park Department of Chemical & Biological Engineering and Engineering Research Institute Gyeongsang National University900 Gajwa-dongJinju660-701Korea School of Nano and Advanced Materials Engineering and Engineering Research Institute Gyeongsang National University900 Gajwa-dongJinju660-701Korea Kaya Advanced Material Art Inc. Baekrok-Ri 1010-1Yangsan 626-862Korea

Iron disulfide(FeS_2)cathode active material was prepared from iron and sulfur at room temperature by high energy mechanical *** FeS_2 composites containing Co or Ni transition metal powders as additives were also prepared by the same *** cells with these FeS_2 cathodes were studied for charge-discharge properties at room temperature using 0.5M LiTFSI in tetra(ethylene glycol)dimethyl ether(TEGDME)*** voltammetry showed two anodic oxidation peaks at 1.8 and 2.5V and two cathodic reduction peaks at 2.0 and 1.3 V for FeS_2 with metal *** addition of 5wt% Co and 3wt% Ni resulted in an enhancement of the first discharge capacity giving 571 and 844mAh/g respectively at *** cycle performance was also enhanced remarkably by the addition of these electrically conductive transition metals in the active ***_2 with 5wt% Co exhibited a stable cycle performance delivering a reversible capacity of 338mAh/g(37.8% of theoretical capacity)after 20 cycles.

关键词：阴极材料二硫化铁锂离子电池循环性能

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

INTERDECADAL VARIATION IN THE ACTIVITY OF TROPICAL CYCLONES AFFECTING KOREA

引用

Tropical Cyclone Research and Review 2015年第2期4卷 88-93页

作者： jae-won choi YUMI CHA National Institute of Meteorological Sciences

By performing a statistical change-point analysis of activities of the tropical cyclones(TCs)that have affected Korea(K-TCs),it was found that there was a signifi cant change between 1983 and *** the period of 1984-2004(P2),more TCs migrated toward the west,recurved in the southwest,and affected Korea,compared to the period of 1965-1983(P1).These changes for P2 were related to the southwestward expansion of the subtropical western Pacifi c high(SWPH)and,simultaneously,elongation of its elliptical shape toward *** of these changes,the central pressure and lifetime of K-TC during P2 were deeper and longer,respectively,than fi gures for *** stronger K-TC intensity for P2 was related to the more southwestward genesis due to the southwestward expansion of the *** weaker vertical wind shear environment during P2 was more favorable for K-TC to maintain a strong intensity in the mid-latitudes of East Asia.

关键词： change-point analysis tropical cyclone subtropical western Pacific High shift vertical wind shear

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

TROPICAL CYCLONE OCCURRENCE PROBABILITY FORECASTING MODEL IN THE WESTERN NORTH PACIFIC

引用

Tropical Cyclone Research and Review 2016年第1期5卷 23-31页

作者： jae-won choi YUMI CHA National Institute of Meteorological Sciences

A seasonal probability prediction model for tropical cyclone(TC)genesis in the western North Pacifi c(5°-25°N,110°-180°E)was developed using a simple logistic regression *** predictors used in this model were total fi ve:850 h Pa relative vorticity,200-850 h Pa vertical wind shear,600 h Pa relative humidity,300 h Pa equivalent potential temperature,and sea surface temperature(SST).Four predictors except for SST were obtained from differences of spatial-averaged value between May and January,and time average of Ni?o-3.4 index from February to April was used to consider the SST *** a result of prediction for the TC genesis from June to December during 1951 to 2007,years that the model forecasts are 21 years among the total 28 years when the observed TC genesis frequency was higher than normal *** overall predictability was about 75%,and the model was also verifi ed statistically through cross validation analysis using a method of the hindcast.

关键词： tropical cyclone genesis logistic regression model predictors cross validation

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

Low Phase Noise VCO using Novel Harmonic Control Circuit Based on Quad-band Composite Right/Left-handed Transmission Line

引用

Journal of Measurement Science and Instrumentation 2010年第4期1卷 380-386页

作者： jae-won choi Chul-hun SEO School of Electronic Engineering Soongsil University

In this paper, a novel Voltage-Controlled Oscillator （VCO） using the harmonic control circuit based on the quad-band Composite Right/Left-Handed （CRLH） Transmission Line （TL） is presented to reduce the phase noise without the reduction of the frequeacy tuning range and miniaturizing the circuit size. The phase noise has been reduced by the quad-band harmonic control circuit which has the short impedance for the second- and third- and fourth- and fifth-hannonic components. The CRLH TL with two Left-Handed （LH）（backward） and two Right-Handed （RH）（forward） pass bands are used to design the quad-band harmonic control circuit. The high- Q resonator has been used to reduce the phase noise, but it has the problem of the frequency timing range reduction. However, the frequency tuning range of the proposed VCO has not reduced because the phase noise has reduced without the high-Q resonator. The miniaturization of the circuit size is achieved by using the quad-band CRLH TL instead of the conventional RH TL, The phase noise of VCO is - 124.43～ - 122.67 dBc/Hz at 100 kHz in the tuning range of 5. 729 ～5.934 GHz.

关键词： VCO phase noise frequency tuning range miniaturization novel harmonic control circuit quad-band CRLH TLs

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

洛伐他汀抑制Rho激酶信号通路增强人内皮一氧化氮合酶mRNA稳定性

引用

中国生物化学与分子生物学报 2011年第8期27卷 744-754页

作者：宋国华秦树存 jae won choi 中国泰山医学院动脉粥样硬化研究所泰安271000 韩国延世大学原州220-701

他汀类药物可上调内皮一氧化氮合酶(ENOS)的表达,并由甲羟戊酸(MVA)途径介导,但具体机制未完全阐明.本研究旨在探索洛伐他汀(LVT)上调ENOS表达的分子信号机制并明确同ENOS表达相关的顺式作用元件的定位.洛伐他汀通过减少细胞内固醇,如MV... 详细信息

他汀类药物可上调内皮一氧化氮合酶(ENOS)的表达,并由甲羟戊酸(MVA)途径介导,但具体机制未完全阐明.本研究旨在探索洛伐他汀(LVT)上调ENOS表达的分子信号机制并明确同ENOS表达相关的顺式作用元件的定位.洛伐他汀通过减少细胞内固醇,如MVA和geranylgeranylpyrophosphate(GGPP),从而增加ENOS mRNA的稳定性.因GGPP是细胞内信号蛋白如Ras、RhoGTPase进行翻译后修饰和膜定位所必需的,因此很可能洛伐他汀的作用与细胞内信号途径有关.进一步的实验结果显示Rho激酶抑制剂hydroxyfasudil和细胞松弛素D均可在转录后水平上调ENOS mRNA表达,表明Rho途径介导的细胞骨架状态在ENOS mRNA降解率的调控中起一定作用.细胞转染实验证明调控ENOS mRNA降解的顺式作用元件位于其mRNA序列上的3'未翻译区(3'UTR)和相邻的编码区.其中调控GGPP介导ENOS mRNA稳定性的顺式作用元件位于序列的3 751～4 606位点间;而hydroxyfasudil通过位于3 751～4 468位点间的顺式作用元件稳定ENOSmRNA;细胞松弛素D通过位于3 904～4 188位点间的元件稳定ENOS mRNA.洛伐他汀可能通过抑制Rho激酶途径稳定ENOS mRNA,此过程由位于mRNA序列上3'UTR及相邻编码区的多样顺式作用元件介导.另外,细胞骨架的空间构造也可影响ENOS mRNA的稳定性,此过程由位于其mRNA序列编码区的顺式作用元件介导.本研究为转录子稳定性调控机制的进一步研究提供了有力根据,或许可为心血管疾病的治疗提供新的分子靶点.

关键词：洛伐他汀(LVT) 内皮一氧化氮合酶 mRNA稳定性多样顺式作用元件

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

INTERANNUAL ANOMALY IN TROPICAL CYCLONE FREQUENCY AROUND KOREA BY WESTERN NORTH PACIFIC MONSOON

引用

Tropical Cyclone Research and Review 2015年第2期4卷 49-63页

作者： jae-won choi SEUNG-WOOK LEE JEOUNG-YUN KIM National Institute of Meteorological Sciences

In this study, the correlation between the frequency of summer tropical cyclones(TC) affecting areas around Korea over the last 37 years and the western North Pacifi c monsoon index(WNPMI) was analyzed. A clear positive correlation existed between the two variables, and this high positive correlation remained unchanged even when excluding El Ni?o-Southern Oscillation(ENSO) years. To investigate the causes of the positive correlation between these two variables, ENSO years were excluded, after which the 8 years with the highest WNPMI(strong WNPM phase) and the 8 years with the lowest WNPMI(weak WNPM phase) were selected, and the average difference between the two phases was *** the strong WNPM phase, TCs usually occurred in the eastern waters of the tropical and subtropical western North Pacifi c, and tended to pass the East China Sea on their way north toward Korea and Japan. In the weak WNPM phase, TCs usually occurred in the western waters of the tropical and subtropical western North Pacifi c, and tended to pass the South China Sea on their way west toward the southeastern Chinese coast and the Indochina peninsula. Therefore, TC intensity was higher in the strong WNPM phase, during which TCs are able to gain suffi cient energy from the sea while moving a long distance to areas nearby Korea. TCs also tended to occur more often in the strong WNPM *** the difference between the two phases regarding 850 h Pa and 500 h Pa streamline, anomalous cyclones were reinforced in the tropical and subtropical western North Pacifi c, while anomalous anticyclones were reinforced in mid-latitude East Asian areas. Due to these two anomalous pressure systems, anomalous southeasterlies developed in areas near Korea, with these anomalous southeasterlies playing the role of anomalous steering fl ows making the TCs head toward areas near Korea. Also, due to the anomalous cyclones developed in the tropical and subtropical western North Pacifi c, more TCs could occur in the s

关键词： tropical cyclone western North Pacific monsoon El Nino-Southern Oscillation Korea

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：