检索结果-南通市图书馆

Perfect light absorption in monolayer MoS;empowered by optical Tamm states

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2021年第10期19卷 103-108页

作者： Yangwu Li Hua Lu Jiadeng Zheng shichang Li Xiao Xuan Jianlin zhao MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions Key Laboratory of Light-Field Manipulation and Information AcquisitionMinistry of Industry and Information Technologyand Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi'an 710129China

We present the perfect light absorption of monolayer molybdenum disulfide(MoS_(2))in a dielectric multilayer system with two different Bragg *** results show that the strong absorption of visible light in monolayer MoS_(2) is attributed to the formation of optical Tamm states(OTSs)between two Bragg *** MoS_(2) absorption spectrum is dependent on the layer thickness of Bragg mirrors,incident angle of light,and the period numbers of Bragg ***,the nearly perfect light absorption(99.4%)of monolayer MoS_(2) can be achieved by choosing proper period numbers,which is well analyzed by the temporal coupled-mode theory.

关键词： optical Tamm states molybdenum disulfide light absorption

Variation　of　Satellite　Intensity　Factors　with　n　in　the　1s~2s∈lc→1s~23dnl→1s~2pnl　Dielectronic　Recombination　of　Lithiumlike　Ions

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

原子与分子物理学报 1995年第1期 99-106页

作者： zhao Libo(Institute of Physics Chinese Academy of Sciences P.O.Box 603 Beijing 100080)Li shichang(Institute Of Applied Physics and Computational Mathematics P. O. Box 8009 Beijing 100088)

ＶａｒｉａｔｉｏｎｏｆＳａｔｅｌｌｉｔｅＩｎｔｅｎｓｉｔｙＦａｃｔｏｒｓｗｉｔｈｎｉｎｔｈｅ１ｓ~２ｓ∈ｌｃ→１ｓ~２３ｄｎｌ→１ｓ~２ｐｎｌＤｉｅｌｅｃｔｒｏｎｉｃＲｅｃｏｍｂｉｎａｔｉｏｎｏｆＬｉｔｈｉｕｍｌｉｋｅ... 详细信息

ＶａｒｉａｔｉｏｎｏｆＳａｔｅｌｌｉｔｅＩｎｔｅｎｓｉｔｙＦａｃｔｏｒｓｗｉｔｈｎｉｎｔｈｅ１ｓ~２ｓ∈ｌｃ→１ｓ~２３ｄｎｌ→１ｓ~２ｐｎｌＤｉｅｌｅｃｔｒｏｎｉｃＲｅｃｏｍｂｉｎａｔｉｏｎｏｆＬｉｔｈｉｕｍｌｉｋｅＩｏｎｓ￥ＺｈａｏＬｉｂｏ(Ｉｎｓ?..

关键词： Autoionization Dielectronic recombination Satellite intensity factor

High Asia cryospheric observation:a proposed network under Global Cryosphere Watch(GCW)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Research in Cold and Arid Regions 2012年第1期4卷 1-12页

作者： CunDe Xiao ZhongQin Li Lin zhao shichang Kang YuanQing He Xiang Qin XiaoBo He State Key Laboratory of Cryospheric Sciences CoM and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou Gansu 730000 China Institute of Climate System Chinese Academy of Meteorological Science China Meteorology Administration Beij＇ing 100081 China Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100871 China

In coordination with Global Cryosphere Watch （GCW） initiated by World Meteorology Administration （WMO）, a regional ob- servation network is proposed based on existing stations/sites over High Asia and cryospberic elements required by GCW. Thus, High Asian Cryosphere （HAC） network is preliminary designed, composing of seven ＂supersites＂, each containing several refer- ence sites. The network covers major mountain ranges in High Asia, such as East Tianshan, Qilian, Tanggula, Nyainqentanglha, Himalayas as well as the central and eastern Qinghai-Xizang （Tibet） Plateau. Although multiple cryospberic elements were ob- served at the existing HAC network, many others, which are required by Integrated Global Observation System-Cryosphere Theme （IGOS-Cryosphere）, are not yet included. More comprehensive observations are necessary to be included into ＂supersites＂ of HAC, so that the basic requirements for validation of satellite data, assimilation and coupled regional models can be met.

关键词： cryosphere reference site supersite standardization High Asia

The frst avian infuenza A (H7N9) viral infection in humans in Zhejiang Province, China: a death report

在线全文

学校读者我要写书评

暂无评论

Frontiers of Medicine 2013年第3期7卷 333-344页

作者： Enfu Chen Fenjuan Wang Huakun Lv Yanjun Zhang Hua Ding Shelan Liu Jian Cai Li Xie Xiaoping Xu Chengliang Chai Haiyan Mao Jimin Sun Junfen Lin zhao Yu Lianhong Li Zhiping Chen shichang Xia Department of Infectious Diseases Zhejiang Center for Disease Control and Prevention Department of Infectious Diseases Xiaoshan District Center for Disease Control and Prevention Department of Infectious Diseases Hangzhou Center for Disease Control and Prevention Department of Infectious Diseases Jiande Center for Disease Control and Prevention

This study reports the frst death caused by a novel avian infuenza A(H7N9)virus in Zhejiang Province,*** patient had chronic hepatitis B and history of exposure to *** patient initially complained of diarrhea and infuenza-like symptoms on March 7 and 14 *** disease progressed to severe pneumonia,sustained hypoxia,and coagulation *** patient died on March 27 because of respiratory failure,multiple organ failure,and disseminated intravascular coagulation without oseltamivir *** H7N9 virus from Zhejiang is highly similar to isolates obtained from Shanghai,Jiangsu,Anhui,*** of hemagglutinin,neuramidinase,and matrix genes indicated that the isolates share the same avian origin,have low virulence,and are sensitive to oseltamivir,but are resistant to *** the isolate that caused the fatality exhibited substitution of Q226I in the HA gene,which indicates a potentially enhanced human *** secondary transmission rate was 1.6%(2/125).Only two health workers presented with infuenza-like symptoms,and they subsequently tested negative for H7N9 *** conclusion,underlying disease,late diagnosis,and untimely antiviral treatment are possible high-risk factors for infections and death caused by the lowpathogenicity avian infuenza A(H7N9).Person-to-person transmission of the H7N9 virus was not detected among close contacts,but such transmission should be investigated in the *** and enhancing surveillance will help in the early discovery and diagnosis of suspected cases,which will reduce the number of severe cases and deaths.

关键词： avian influenza A (H7N9) virus epidemiology contacts person-to-person transmission

聚砜/聚苯胺-嵌段式聚醚Pluronic F127复合超滤膜的制备及性能

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

化工学报 2013年第2期64卷 702-710页

作者：赵博然王志赵颂王纪孝王世昌天津大学化工学院化学工程研究所天津300072 化学工程联合国家重点实验室(天津大学) 天津300072 天津市膜科学与海水淡化技术重点实验室(天津大学) 天津300072

选用具有不同改性机理的嵌段式聚醚Pluronic F127与聚苯胺(PANI)纳米纤维共同作为添加剂共混改性聚砜(PSf)超滤膜,利用浸没沉淀相转化法制备出PSf/PANI-F127复合超滤膜。考察、比较并分析两种改性材料同时存在对膜结构和膜性能的影响。... 详细信息

选用具有不同改性机理的嵌段式聚醚Pluronic F127与聚苯胺(PANI)纳米纤维共同作为添加剂共混改性聚砜(PSf)超滤膜,利用浸没沉淀相转化法制备出PSf/PANI-F127复合超滤膜。考察、比较并分析两种改性材料同时存在对膜结构和膜性能的影响。膜结构通过傅里叶衰减全反射红外(ATR-FTIR)、X射线光电子能谱(XPS)、X射线能量色散谱(EDS)、扫描电镜(SEM)和接触角等测试表征。膜性能通过纯水通量、截留率、抗污染性能以及添加剂稳定性结果进行评价。实验结果表明,Pluronic F127的加入可以更有效地提高膜表面亲水性,而PANI纳米纤维的加入则可以使膜孔隙率增大、表面孔径尺寸降低、皮层变薄。实验进一步发现,两种添加剂在改善膜结构与性能上起协同作用。PANI-F127一方面提高了膜纯水通量与抗污染性能,另一方面克服了单独使用Pluronic F127时添加量大、截留率低、添加剂易流失的缺点。

关键词：超滤膜嵌段共聚物聚苯胺亲水性抗污染

DIELECTRONIC RECOMBINATION RATE COEFFICIENTS FOR NEONLIKE IONS

在线全文

学校读者我要写书评

暂无评论

原子与分子物理学报 1996年第1期13卷 17-23页

作者： zhao Libo Li shichang(Institute of Physics. Chinese Academy of Sciences, P. O. Box 603 Beijing 100080)(Instiute of Applied Physics and Computational Mathematics, P. O. Box 8009 Beijing 100080) 中科院物理所北京 100080 北京应用物理和计算数学所北京 100080

ＤＩＥＬＥＣＴＲＯＮＩＣＲＥＣＯＭＢＩＮＡＴＩＯＮＲＡＴＥＣＯＥＦＦＩＣＩＥＮＴＳＦＯＲＮＥＯＮＬＩＫＥＩＯＮＳＤＩＥＬＥＣＴＲＯＮＩＣＲＥＣＯＭＢＩＮＡＴＩＯＮＲＡＴＥＣＯＥＦＦＩＣＩＥＮＴＳＦＯＲＮＥＯＮＬＩＫＥ... 详细信息

ＤＩＥＬＥＣＴＲＯＮＩＣＲＥＣＯＭＢＩＮＡＴＩＯＮＲＡＴＥＣＯＥＦＦＩＣＩＥＮＴＳＦＯＲＮＥＯＮＬＩＫＥＩＯＮＳＤＩＥＬＥＣＴＲＯＮＩＣＲＥＣＯＭＢＩＮＡＴＩＯＮＲＡＴＥＣＯＥＦＦＩＣＩＥＮＴＳＦＯＲＮＥＯＮＬＩＫＥＩＯＮＳ￥ＺｈａｏＬｉｂｏ；ＬｉＳ...

关键词： dielectronic recombination autoionization rate coefficient

Feeding mediated web-building plasticity in a cobweb spider

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Current Zoology 2023年第6期69卷 756-765页

作者：张海新李刚李长春陈建赵泽宇张士昶刘杰 State Key Laboratory of Biocatalysis and Enzyme Engineering&Centre for Behavioral Ecology and Evolution School of Life SciencesHubei UniversityWuhan430062China National Engineering Laboratory for Modern Silk College of Textile and Clothing EngineeringSoochow UniversitySuzhou 215123China Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables College of Life Science and TechnologyHubei Engineering UniversityXiaogan 432000China Hubei Key Laboratory of Regional Development and Environmental Response Faculty of Resources and Environmental ScienceHubei UniversityWuhan 430062China

Behavioral plasticity has been proposed as a means by which animals alter their phenotypes in response to changing *** may display behavioral plasticity as a consequence of environmental *** detritus-based,bell-shaped cobweb spider Campanicola campanulata is an ideal model to study behavioral plasticity,because its web architecture is easy to be quantified,and the functions of different parts of the web are *** the plasticity of cobweb architecture has been reported in a few species,retreats as impor-tant defensive structures have rarely been considered before because retreats in most cobwebs are relatively small compared with the web *** studied the web-building behaviors of *** under different feeding *** set up 3 spider treatments with different feeding conditions:marginally well fed,moderately well fed,and extremely well fed,and observed the differences in the web architecture among *** addition,we measured the mechanical properties of anchor silk,and also calculated the foraging and defense investment of the *** results showed that marginally well-fed spiders build cobwebs with significantly longer length of anchor silk,lower retreat to the ground,more number and longer gumfooted lines,and larger capture area,while extremely well-fed spiders build cobwebs with significantly bigger retreat volume and higher height of retreat to the *** addition,marginally well-fed spiders invest significantly less during cobweb ***,there was no significant difference between the breaking force and elongation at break in anchor silk among different *** results demonstrated that marginally well-fed spiders invest more in foraging,and extremely well-fed spiders invest more in defense,and the spider made a balance between foraging and predator avoidance in response to changes in physiological *** study strengthens the current understanding of web construction in cobweb spider

关键词： behavioral plasticity Campanicola campanulata cobweb spider defense foraging

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

复合坡度珊瑚礁地形上波浪破碎的试验研究

水科学进展 2018年第5期29卷 717-727页

作者：诸裕良宗刘俊赵红军严士常虞琦河海大学港口海岸与近海工程学院江苏南京210098

通过波浪水槽试验,研究了珊瑚礁地形上规则波的破碎特征,包括破碎类型、破碎波高、破碎位置以及破碎带宽度。试验在带礁缘的复合坡度断面下进行,测试了两种水位下系列波高和波周期相组合的工况。试验研究了波浪破碎类型的区分标准,评估... 详细信息

通过波浪水槽试验,研究了珊瑚礁地形上规则波的破碎特征,包括破碎类型、破碎波高、破碎位置以及破碎带宽度。试验在带礁缘的复合坡度断面下进行,测试了两种水位下系列波高和波周期相组合的工况。试验研究了波浪破碎类型的区分标准,评估了已有四类破碎指标在复合坡度珊瑚礁地形上的适用性,并给出了描述破碎位置和破碎带宽度的经验公式。结果表明:礁边水深深水波高比可较好地区分波浪的破碎类型;四类破碎指标关系式中以破碎波高深水波高比之于深水波陡的相关性为最优;深水波高和礁边水深是影响破碎位置和破碎带宽度的主要因素,随着深水波高礁边水深比的增大,量纲一破碎位置(破碎点与礁边的距离和礁边处浅水波长的比值)逐渐减小,量纲一破碎带宽度(破碎带宽度和礁边浅水波长的比值)逐渐增大。

关键词：珊瑚礁波浪破碎破碎指标破碎位置破碎带宽度

在线全文

学校读者我要写书评

暂无评论

基于模型偏差学习的交通信号自适应优化方法

铁道科学与工程学报 2024年第6期21卷 2229-2240页

作者：黄玮张轩宇李世昌赵靖中山大学智能工程学院广东深圳518107 上海理工大学智慧城市交通研究院上海200093

城市交通信号配时优化是保证交通系统整体运行效率的前提条件。传统基于模型的信号控制方法往往基于历史统计数据,并且底层交通流模型不可避免地存在模型偏差,影响控制方案的科学性及其实际应用效果。考虑模型与数据融合驱动,提出一种... 详细信息

城市交通信号配时优化是保证交通系统整体运行效率的前提条件。传统基于模型的信号控制方法往往基于历史统计数据,并且底层交通流模型不可避免地存在模型偏差,影响控制方案的科学性及其实际应用效果。考虑模型与数据融合驱动,提出一种基于模型偏差学习的交通信号控制自适应优化方法,以最小化路网行程时间为目标,建立信号控制最优化模型。首先,针对交通流预测模型的模型偏差,引入偏差函数表示预测模型与实际交通流状态间的误差;其次,建立基于径向基函数(RBF)神经网络的偏差函数,结合实际交通流数据对模型偏差进行学习,提高偏差函数的拟合效果;在此基础上,提出考虑模型偏差信息的自适应优化方法,以提高信号控制方法的控制性能。以小型测试路网与实际路网为例进行算例分析,基于SUMO仿真对本文提出的模型偏差学习方法进行验证,考虑不同交通流量条件,与固定配时、模型预测控制进行比较,分析其控制性能指标。结果表明,模型与数据融合驱动的信号控制自适应优化方法能有效提高预测模型的准确性,降低路网行程时间,与基于模型的控制和模型预测控制方法相比路网累积行程时间平均减少了38.3%和25.6%,提升了路网的实际运行效果。最后在宣城实际路网的仿真验证了方法的有效性。

关键词：城市道路交通信号控制模型与数据融合驱动模型偏差自适应优化