检索结果-南通市图书馆

Integration and scaling of UV-B radiation effects on plants: the relative sensitivity of growth forms and interspecies interactions

引用

Journal of Plant Ecology 2018年第4期11卷 656-670页

作者： Vasile Alexandru Suchar Ronald Robberecht Department of Statistical Science College of ScienceUniversity of Idaho875 Perimeter Drive MS1104MoscowID 83844-1104USA Department of Forest Rangelandand Fire SciencesCollege of Natural ResourcesUniversity of Idaho875 Perimeter Drive MS1133MoscowID 83844-1133USA

Aims the relative plant type sensitivity and selected community interac-tions under increased UV-B radiation where ***,we investigated:(i)if there are differences among growth forms in regard to their sensitivity to UV-B radiation,(ii)if increased UV-B radiation influences the plant competitive balance in plant com-munities and(iii)the response mechanisms of the UV-B radiation-sensitive species that might increase their *** to answer our research questions,we used a mechanistic model that,for the first time,integrated the effects of increased UV-B radia-tion from molecular level processes,whole plant growth and devel-opment,and community *** Findings In the model simulations,species types exhibited different levels of sensitivity to increased UV-B *** C3 and C4 annuals showed similar growth inhibition rates,while biennials and winter C3 annuals were the most *** exhibited inhibitions in growth only if increased UV-B radiation results in increases in metabolic *** communities,species sensitive to UV-B radiation may have a competitive disadvantage compared to resistant plant ***,sensitive species may have a wide array of responses that can increase their fitness and reproductive success in the com-munity,such as,increased secondary metabolites production,changes in timing of emergence and reproduction,and changes in seed *** individual plants may exhibit significant inhibi-tions in growth and development,in communities,these inhibitions can be mitigated by small morphological and physiological *** or occasional increased UV-B radiation events should not have any lasting effect on the structure of the commu-nity,unless other environmental factors are perturbing the dynamic equilibrium.

关键词： UV-B radiation effects plant growth and development simulation modeling relative sensitivity competition

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

Evaluation and mapping of relative sensitivity of the terrestrial ecosystems to acidic deposition in Fujian

引用

Journal of Forestry Research 2000年第1期11卷 13-18页

作者：樊后保梁慧燕林德喜陈世品 Fujian Forestry College Nanping 353001 P.R.China Northeast Forestry University Harbin 150040 P.R.China Japan International Forestry Promotion and Cooperation Center Tokyo Japan

Based on the semi-quantitative approach, four environmental factors of sites (i.e. bedrock lithology, soil type, land use, and rainfall) were categorized, weighted and combined to determine and assess the relative sensitivity of the terrestrial ecosystems to acidic deposition in Fujian Province. Then the factors have been digitized and combined to assign an overall value for each mesh square (16.77 km×18.39 km) by using the geographic information system (GIS) The results indicated that the most sensitive area in Fujian was mainly located in the southeast, and the least: ensitive area was distributed sporadically in the east along the coast. Due to slow weathering rate of siliceous rocks, acid to weakly acid reactions of the soils, along with the greater percent of coniferous forests, more than 80 percent of the total area exhibits higher sensitivity classes (4–7).

关键词： Acidic deposition Terrestrial ecosystem relative sensitivity Mesh map

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

Design of a Porous Cored Hexagonal Photonic Crystal Fiber Based Optical Sensor With High relative sensitivity for Lower Operating Wavelength

引用

Photonic Sensors 2017年第1期7卷 55-65页

作者： Shuvo SEN Sawrab CHOWDHURY Kawsar AHMED Sayed ASADUZZAMAN Department of Information and Communication Technology Mawlana Bhashani Science and Technology UniversitySantosh Tangail-1902 Bangladesh Group of Biophotomatix Bangladesh

In this article, highly sensitive and low confinement loss enriching micro structured photonic crystal fiber （PCF） has been suggested as an optical sensor. The proposed PCF is porous cored hexagonal （P-HPCF） where cladding contains five layers with circular air holes and core vicinity is formed by two layered elliptical air holes. Two fundamental propagation characteristics such as the relative sensitivity and confinement loss of the proposed P-HPCF have been numerically scrutinized by the full vectorial finite element method （FEM） simulation procedure. The optimized values are modified with different geometrical parameters like diameters of circular or elliptical air holes, pitches of the core, and cladding region over a spacious assortment of wavelength from 0.8 ktm to 1.8 -m. All pretending results exhibit that the relative sensitivity is enlarged according to decrement of wavelength of the transmission band （O＋E＋S＋C＋L＋U）. In addition, all useable liquids reveal the maximum sensitivity of 57.00%, 57.18%, and 57.27% for n=1.33, 1.354, and 1.366 respectively by lower band. Moreover, effective area, nonlinear coefficient, frequency, propagation constant, total electric energy, total magnetic energy, and wave number in free space of the proposed P-HPCF have been reported recently.

关键词： Optical sensor relative sensitivity porous core PCF confinement loss transmission band effective area

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

relative Broken Family sensitivity

引用

Acta Mathematica Sinica,English Series 2024年第9期40卷 2297-2306页

作者： Zhuo Wei LIU Tao YU Department of Mathematics Shantou UniversityShantou 515063P.R.China

Letπ:(X,T)→(Y,S)be a factor map between two topological dynamical systems,and F_(a) Furstenberg family of *** introduce the notion of relative broken *** Fs(***,Finf)be the families consisting of all syndetic subsets(*** upper Banach density subsets,infinite subsets).We show that for a factor mapπ:(X,T)→(Y,S)between transitive systems,πis relatively broken F-sensitive for F=Fs or Fpubd if and only if there exists a relative sensitive pair which is an F-recurrent point of(R_(π),T^((2)));is relatively broken Finf-sensitive if and only if there exists a relative sensitive pair which is not *** a factor mapπ:(X,T)→(Y,S)between minimal systems,we get the structure of relative broken F-sensitivity by the factor map to its maximal equicontinuous factor.

关键词： relative sensitivity recurrent points Furstenberg family relative sensitive pairs maximal equicontinuous factor

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

Design and Optimization of Photonic Crystal Fiber Based Sensor for Gas Condensate and Air Pollution Monitoring

引用

Photonic Sensors 2017年第3期7卷 234-245页

作者： Md. Ibadul ISLAM Kawsar AHMED Shuvo SEN Sawrab CHOWDHURY Bikash Kumar PAUL Md. Shadidul ISLAM Mohammad Badrul Alam MIAH Sayed ASADUZZAMAN Department of Information and Communication Technology (ICT) Mawlana Bhashani Science and Technology University Santosh Tangail 1902 Bangladesh Group of Bio-photomatix Tangail 1902 Bangladesh Department of Software Engineering (SWE) Daffodil International University Sukrabad Dhaka 1207 Bangladesh

In this paper, a hexagonal shape photonic crystal fiber （H-PCF） has been proposed as a gas sensor of which both micro-structured core and cladding are organized by circular air cavities. The reported H-PCF has a single layer circular core which is surrounded by a five-layer hexagonal cladding. The overall pretending process of the H-PCF is completed by using a full vectorial finite element method （FEM） with perfectly matched layer （PML） boundary condition. All geometrical parameters like diameters and pitches of both core and cladding regions have fluctuated with an optimized structure. After completing the numerical analysis, it is clearly visualized that the proposed H-PCF exhibits high sensitivity with low confinement loss. The investigated results reveal the relative sensitivity of 56.65% and confinement loss of 2.31×10^-5 dB/m at the 1.33%tm wavelength. Moreover, effective area, nonlinearity, and V-parameter of the suggested PCF are also briefly described.

关键词： relative sensitivity confinement loss gas sensor effective area nonlinearity and photonic crystal fiber

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

relative sensitivities of woody plants to acid deposition in south areas of China

引用

Journal of Environmental Sciences 1991年第2期3卷 61-68页

作者： Feng Zongwei and Shan YunfengResearch Center for Eco-Environmental Sciences,Academia Sinica,Beijing 100083,China

relative sensitivities of 30 species of common woody plants to simulated acid rain with pH values of 2.0, 2.5, 3.0, 3.5, 4.5 and control were studied. The results showed that 6 species of these plants were sensitive to simulated acid rain. The moderate included 18 species. The resistant included 6. relative sensitivities to ambient acid rain and air pollutants and visible injury degree of 30 species of common woody plants in Chongqing City were investigated. Results showed that 6 species with foliage lesion rate at above 10 percent were sensitive, that 6 species with no lesion were resistant and that other 18 species with lesion at 10 percent below were moderate. Other 7 cities (Guiyang, Zunyi, Duyun, Changsha, Zhuzhou, Liuzhou and Guilin City) were also investigated and results were consistent with those of Chongqing City. The experimental and investigated results showed relative sensitivities and visible injury degree of woody plants to simulated acid rain were consistent with those of the woody plants to ambient acid rain and air pollutants. The sensitive plants may be used as bioindicators to acid rain or air pollutants. The resistant species can be introduced to acid rain and air pollution areas to substitute damaged sensitive plants in order to improve environment.

关键词： relative sensitivity acid rain woody plant.

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

Investigation of the temperature characteristic in SrB4O7：Sm2＋ phosphor-in-glass by analyzing the lifetime of 684 nm

引用

Journal of Rare Earths 2017年第8期35卷 783-786页

作者：曾鹏曹中民陈永虎尹民 Key Laboratory of Strongly-Coupled Quantum Matter Physics Chinese Academy of Sciences School of Physical Sciences University of Science and Technol-ogy of China Hefei 230026 China

The SrB4O7：Sm2＋ phosphor was synthesized by high temperature solid state reaction method. The phosphor-in-glass was prepared by mixing and firing the phosphor and TeO2-ZnO glass precursor. The XRD results showed that the phosphor-in-glass was in amorphous phase because of the tiny mass fraction of phosphor in glass. The emission spectrum under the 355 nm excitation was measured, and it exhibited the same characteristic emission peaks as the phosphor sample. The temperature characteristic of the SrB4O7：Sm2＋ phosphor-in-glass was discussed by analyzing the lifetime of 684 nm emission at various temperatures. The relative temperature sensitivity of 5%/K around 573 K was obtained for the temperature dependent lifetime, suggesting that the material in this study is a promising candidate for temperature sensor application.

关键词： temperature characteristic decay curve relative sensitivity rare earths

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

Study of the Performance of a Streaked Optical Pyrometer System for Temperature Measurement of Shocked Materials

引用

Plasma Science and Technology 2014年第6期16卷 571-576页

作者：张琛刘浩王哲斌蒋小华张惠鸽刘永刚李志超李三伟杨冬丁永坤赵斌胡广月郑坚 CAS Key Lab of Basic Plasma Physics Department of Modern PhysicsUniversity of Science and Technology of China Laser Fusion Research Center China Academy of Engineering Physics

A streaked optical pyrometer （SOP） is developed and calibrated for the measurement of the temperature of shocked materials. In order to achieve a higher relative sensitivity, a onechannel scheme is adopted for the system. The system is calibrated with a shocked step-shaped aluminum sample in the SG-III prototype laser facility. The relation between the count number in the detection system and the sample temperature is thus obtained, which can be adopted to infer the temperature of any shocked materials in future experiments.

关键词： streaked optical pyrometer relative sensitivity temperature

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

High-sensitivity Early Detection Biomedical Sensor for Tuberculosis With Low Losses in the Terahertz Regime Based on Photonic Crystal Fiber Technology

引用

Photonic Sensors 2023年第2期13卷 14-29页

作者： Nazmi A.MOHAMMED Omar E.KHEDR El-Sayed M.EL-RABAIE Ashraf A.M.KHALAF Department of Electronics and Communication Engineering Medina Higher Institute for Engineering and TechnologyGiza 12947Egypt Department of Communications and Electronics Alexandria Higher Institute for Engineering and TechnologyAlexandria 21311Egypt Department of Electronics and Communications Engineering Faculty of Electronic EngineeringMenoufia UniversityMenouf 32952Egypt Department of Communications and Electronics Faculty of EngineeringMinia UniversityMinia 61111Egypt

Tuberculosis is one of the most contagious and lethal illnesses in the world,according to the World Health *** had the leading mortality rate as a result of a single infection,ranking above HIV/*** detection is an essential factor in patient treatment and can improve the survival *** methods should have high mobility,high accuracy,fast detection,and low *** work presents a novel biomedical photonic crystal fiber sensor,which can accurately detect and distinguish between the different types of tuberculosis *** designed sensor detects these types with high relative sensitivity and negligible losses compared to other photonic crystal fiber-based biomedical *** proposed sensor exhibits a relative sensitivity of 90.6%,an effective area of 4.342×10^(-8)m^(2),with a negligible confinement loss of 3.13×10^(-9)cm^(-1),a remarkably low effective material loss of 0.0132cm-f,and a numerical aperture of *** proposed sensor is capable of operating in the terahertz regimes over a wide range(1 THz-2.4 THz).An abbreviated review of non-optical detection techniques is also *** in-depth comparison between this work and recent related photonic crystal fiber-based literature is drawn to validate the efficacy and authenticity of the proposed design.

关键词： Tuberculosis photonic crystal fiber relative sensitivity terahertz confinement loss effective area

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

Benzene Shape Photonic Crystal Fiber Based Plasma Sensor： Design and Analysis

引用

Photonic Sensors 2018年第3期8卷 263-269页

作者： Md. Toriqul ISLAM Md. Golam MOCTADER Kawsar AHMED Sawrab CHOWDHURY Department of Physics Mawlana Bhashani Science and Technology University Santosh Tangail-1902 Bangladesh Group of Bio-photomatix Tangail-1902 Bangladesh Department of Information and Communication Technology Mawlana Bhashani Science and Technology UniversitySantosh Tangail-1902 Bangladesh

A novel benzene core photonic crystal fiber （BC-PCF） is proposed for plasma sensing applications. The proposed BC-PCF parameters have been tuned to gain high sensitivity, high numerical aperture （NA）, and low confinement loss, and modality over the extensive variety of 0.7 μm to 1.9μm wavelength. The explored results for the ideal structure have exhibited the high sensitivity up to 77.84% and negligible confinement loss of 7.9×10^-3dB/m at 1.3μm wavelength. The V-barometer remains under 2.405 over the whole working wavelength. So the proposed BC-PCF is a single mode fiber, which advances the long partition correspondence applications. Furthermore, high numerical aperture （NA） makes the fiber potential candidate in medical imaging applications. The plan of the sensor is to find out the creative potential outcomes in sensing applications.

关键词： Optical sensor relative sensitivity numerical aperture confinement loss benzene core photonic crystal fiber (BC-PCF)

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：