检索结果-南通市图书馆

Remote Sensing and Landscape Metrics-Based Forest Physical Degradation: Two-Decades Assessment in Gishwati-Mukura Biological Corridor in Rwanda, East-Central Africa

引用

Journal of Geoscience and Environment Protection 2022年第4期10卷 64-81页

作者： Hassina Uwiringiyimana jaeyong choi Department of Environment and Forest Resources Chungnam National University Daejeon Republic of Korea

The management of forest corridors and related ecology is one of the effective strategies to minimize the adverse effects of forest degradation. It controls the connectivity of inhabitant species and the connection of the isolated patches. This study analyzed spatial and temporal forest physical degradation based on forest cover change and forest fragmentation in the Gishwati-Mukura biological corridor from 1990-2019. Remotely sensed datasets, Geographical Information System (GIS) and FRAGSTATS software were used to analyze the spatial and temporal physical degradation and changes in forest cover. The results indicated that the Gishwati-Mukura corridor experienced massive deforestation where approximately 7617.1 ha (64.22%) of forest cover was completely cleared out, which implies an annual forest loss of 262.6 ha·year-1 (2.21%) during 1990-2019. The forest cover transitions patterns and geostatistical analysis indicated that extensive deforestation was associated with intensive agriculture. The results demonstrated that agriculture has dramatically increased from 29.46% in 1990 to 57.22% in 2019, with an annual increase of 1.97%. Since Gishwati-Mukura has changed to National Park (NP), it lacks diversified scientific studies addressing the analysis of the remote and spatial patterns to investigate its physical degradation and landscape dynamics. This research study will serve as remote forest analysis gap-filling and as the cornerstone of numerous other research that will contribute to the improvement of the connectivity assessments along the Gishwati-Mukura corridor and other related ecosystems.

关键词： Landscape Metrics Remote Sensing Geographic Information System (GIS) Forest Physical Degradation Biological Corridor National Park

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

Flexible micro-LED display and its application in Gbps multi-channel visible light communication

引用

npj Flexible Electronics 2022年第1期6卷 973-979页

作者： Luhing Hu jaeyong choi Sumin Hwangbo Do-Hoon Kwon Bongkyun Jang Seunghyeon Ji Jae-Hyun Kim Sang-Kook Han Jong-Hyun Ahn School of Electrical and Electronic Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Nanomechanics Nano-Convergence Mechanical Systems Research DivisionKorea Institute of Machinery&Materials(KIMM)156 Gajeongbuk-roYuseong-guDaejeon 34103Republic of Korea

A flexible full-color micro-LED display with high mechanical robustness was fabricated by printing quantum dots(QDs)on a blue micro-LED array using standard *** red and green colors yielded from QDs exhibit a better color gamut than conventional color *** light conversion efficiency was enhanced by adding TiO2 nanoparticles to the QD-photoresist *** full-color micro-LED display was successfully mounted on various unusual substrates such as curved glass,fabrics,and human skin,enabling diverse optoelectronic *** addition,wireless multi-channel visible light communication(VLC)based on the wavelength-division-multiplexing orthogonal-frequency-division-multiplexing(WDM-OFDM)technique was demonstrated using a QD-based color micro-LED panel.A high data transmission rate of 1.9 Gbps was successfully obtained owing to the high electrical-optical modulation bandwidth of the QD-based micro-LED panel.

关键词： communication Gbps visible

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

Surface doping effect on the optoelectronic performance of 2D organic crystals based on cyano-substituted perylene diimides

引用

Chinese Chemical Letters 2024年第9期35卷 193-197页

作者： jaeyong Ahn Zhenping Li Zhiwei Wang Ke Gao Huagui Zhuo Wanuk choi Gang Chang Xiaobo Shang Joon Hak Oh School of Chemical and Biological Engineering Institute of Chemical ProcessesSeoul National UniversitySeoul 08826South Korea State Key Laboratory for Mechanical Behavior of Materials Shaanxi International Research Center for Soft MatterSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Center for Ordered Nanoporous Materials Synthesis School of Environmental Science and EngineeringPohang University of Science and TechnologyGyeongbuk 37673South Korea Instrumental Analysis Center of Xi’an Jiaotong University Xi’an 710049China

Compared to organic thin films,organic single crystals offer significant potential in organic phototransistors(OPTs)due to their enhanced charge transport,large surface area,and defect-free ***,the development of n-type semiconductors has lagged behind p-type *** enhance semiconductor device performance,a doping process can be employed,which typically involves the introduction of charged impurities into the crystalline semiconducting *** aim is to reduce the Ohmic losses,increase carrier density,improve transport capabilities,and facilitate effective carrier injection,ultimately enhancing the electrical properties of the *** doping processes,however,often pose a risk of damaging the structure of single *** this study,we have synthesized novel cyanosubstituted chiral perylene diimides,which self-assemble into two-dimensional single crystals that can be used for n-type semiconductor *** have employed a surface doping strategy using diethylamine vapor without disrupting the crystal *** fabricated devices exhibit significantly higher charge transport properties after doping,achieving a maximum electron mobility of 0.14 cm^(2)V^(-1)s^(-1),representing an improvement of over ***,the optoelectronic performance of the doped devices has significantly improved,with the external quantum efficiency increased by over 9 times and the significantly improved response *** results suggest that our surface doping technology is a promising way for enhancing the performance of 2D organic single-crystal OPTs.

关键词： Doping effect Phototransistors Perylene diimides Organic crystals Cyano substitution

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

腐植酸和硝酸银存在下银纳米粒子对细菌的吸收

引用

腐植酸 2013年第3期 31-36页

作者： Eunjoo Bae Hee-Jin Park jaeyong Yoon Younghun Kim Kyunghee choi Jongheop Yi 韩立新首尔国立大学化学与生物工程学院首尔151742 光云大学化学工程学系首尔139701 国家环境研究所仁川404708 中国腐植酸工业协会北京100120

银纳米粒子(AgNPs)是一种潜在的抗菌材料,会引起细胞膜的损伤,并能产生活性氧(ROS)。由此产生的细胞膜的结构性变化能够增加银离子和AgNPs在细胞中的渗透能力。为了进一步阐述这个问题,我们测试了这种纳米材料的体内和体外细胞毒性,并... 详细信息

银纳米粒子(AgNPs)是一种潜在的抗菌材料,会引起细胞膜的损伤,并能产生活性氧(ROS)。由此产生的细胞膜的结构性变化能够增加银离子和AgNPs在细胞中的渗透能力。为了进一步阐述这个问题,我们测试了这种纳米材料的体内和体外细胞毒性,并通过这种方法来量化和评估它们的纳米毒性。考虑到AgNPs在环境中的行为,毒性可能受到其物理化学性质(尺寸、附聚率、在腐植酸上的吸附性能)和毒性抑制性质的差异影响。我们通过附聚和吸附动力学研究了细胞吸收AgNPs的作用。试验发现,尺寸小于14nm的AgNPs的附聚和吸附高于尺寸为90nm和140nm的AgNPs的附聚和吸附。对于大小为90nm和140nm的AgNPs,吸附作用显著大于附聚作用。值得注意的是,在正规概念下,AgNPs越小越容易被吸收这一正常概念在非生物因素相互作用下可能是错误的。

关键词：银纳米粒子附聚吸附腐植酸盐度大肠杆菌

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

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

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

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：