检索结果-南通市图书馆

Highly sensitive optical fiber temperature sensor based on resonance in sidewall of liquid-filled silica capillary tube

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

Chinese Physics B 2019年第11期28卷 156-160页

作者： Min Li biao feng Jiwen Yin College of Physics and Intelligent Manufacturing Engineering Chifeng UniversityChifeng 024000China Department of Optoelectronics Science Harbin Institute of Technology at WeihaiWeihai 264209China

A highly sensitive optical fiber temperature sensor based on a section of liquid-filled silica capillary tube(SCT)between single mode fibers is proposed. Two micro-holes are drilled on two sides of SCT directly by using femtosecond laser micromachining, and liquid polymer is filled into the SCT through the micro-holes without any air bubbles and then sealed by using ultra-violet(UV) cure adhesive. The sidewall of the SCT forms a Fabry–Perot resonator, and loss peaks are achieved in the transmission spectrum of the SCT at the resonant wavelength. The resonance condition can be influenced by the refractive index variation of the liquid polymer filled in SCT, which is sensitive to temperature due to its high thermooptical coefficient(-2.98 × 10^-4℃^-1). The experimental result shows that the temperature sensitivity of the proposed fiber structure reaches 5.09 nm/℃ with a perfect linearity of 99.8%. In addition, it exhibits good repeatability and reliability in temperature sensing application.

关键词： optical fiber sensors liquid filling temperature measurement

Pn wave velocity and anisotropy beneath Pamir and its adjacent regions

在线全文

学校读者我要写书评

暂无评论

Earthquake Science 2012年第5期25卷 485-493页

作者： biao feng Shunping Pei Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau ResearchChinese Academy of Sciences University of Chinese Academy of Sciences

As the western end point of continental collision between the Indian and Eurasian plates, Pamir is an ideal place to research uplifting mechanisms in the Tibetan plateau. In this study, 141 644 Pn arrivals were used to obtain seismic wave velocities and anisotropy in the uppermost mantle beneath Pamir and its adjacent regions by performing tomographic inversion of Pn travel times. The data were selected from multiple databases, including ISC/EHB, the Annual Bulletin of Chinese Earthquakes, and regional bulletins of Xinjiang. The tomography results reveal significant features with high resolution and correlate well with geological structures. The main results are as follows：（1） The Pn wave velocities are particularly high in the old stable blocks such as Tarim basin, Indian plate and Tajik basin, while the low Pn velocities always lie in tectonically active regions like the western Tibetan plateau, Pamir, Tianshan and Hindu Kush. （2） Strong Pn anisotropy is found beneath the Indian-Eurasian collision zone; its direction is parallel to the collision are and nearly perpendicular to both the direction of maximum compression stress and relative crustal movement. The result is probably caused by the pure shear deformation in the uppermost mantle of the collision zone. （3） A geodynamic continent-continent collision model is proposed to show anisotropy and collision mechanisms between the Indian plate and the Tarim and Tajik basins.

关键词： Pn wave velocity tomography anisotropy Pamir

Seismic damage to road networks subjected to earthquakes in Nepal,2015

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2017年第3期16卷 649-670页

作者： Xie Quancai Lü Gaohu Chen Hao Xu Chong feng biao Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake Administration CCCC Highway Consultants Co. Ltd. Institute of Geology China Earthquake Administration

The Gorkha earthquake in Nepal led to many landslides and severe damage to the transportation infrastructure. After careful comparison of the aerial photographs and satellite images before and after the earthquake, partially verified by a field study, more than 2,064 landslides and many road failures were observed. Many bridges, especially steel-truss and suspension bridges, suffered little damage from inertia loads during the earthquake, but were severely damaged due to rockfalls. Potential geological hazards hindered the delivery of supplies in mountainous areas, and road closures impeded the overall speed of rehabilitation.

关键词： Gorkha earthquake reconnaissance transportation landslide road network

Tensorial stress−strain fields and large elastoplasticity as well as friction in diamond anvil cell up to 400 GPa

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2019年第1期5卷 313-323页

作者： Valery I.Levitas Mehdi Kamrani biao feng Departments of Aerospace Engineering and Mechanical Engineering Iowa State UniversityAmesIA 50011USA Division of Materials Science and Engineering Ames LaboratoryAmesIA 50011USA Department of Aerospace Engineering Iowa State UniversityAmesIA 50011USA Los Alamos National Laboratory Los AlamosNM 87545USA

Various phenomena(fracture,phase transformations,and chemical reactions)studied under extreme pressures in diamond anvil cell are strongly affected by fields of all components of stress and plastic strain ***,they could not be ***,we suggest a coupled experimental−theoretical−computational approach that allowed us(using published experimental data)to refine,calibrate,and verify models for elastoplastic behavior and contact friction for tungsten(W)and diamond up to 400 GPa and reconstruct fields of all components of stress and large plastic strain tensors in W and *** the generally accepted strain-induced anisotropy,strain hardening,and path-dependent plasticity,here we showed that W after large plastic strains behaves as isotropic and perfectly plastic with path-independent surface of perfect ***,scale-independence of elastoplastic properties is found even for such large field *** results open opportunities for quantitative extreme stress science and reaching record high pressures.

关键词： friction stress strain

Application of electrochemistry to single-molecule junctions: from construction to modulation

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

Science China Chemistry 2019年第10期62卷 1333-1345页

作者： Gan Wang biao-feng Zeng Shi-Qiang Zhao Qiao-Zan Qian Wenjing Hong Yang Yang Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China College of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005China

State-of-the-art molecular electronics focus on the measurement of electrical properties of materials at the single-molecule ***, molecular electronics face two primary challenges. One challenge is the reliable construction of single-molecule junctions, and the second challenge is the arbitrary modulation of electron transport through these junctions. Over the past decades, electrochemistry has been widely adopted to meet these challenges, leading to a wealth of novel findings. This review starts from the application of electrochemical methods to the fabrication of nanogaps, which is an essential platform for the construction of single-molecule junctions. The utilization of electrochemistry for the modification of molecular junctions,including terminal groups and structural backbones, is introduced, and finally, recent progress in the electrochemical modulation of single-molecule electron transport is reviewed.

关键词： single-molecule electronics molecular junction electrochemical deposition electrochemical gating

Higgs and Bottom Quarks Associated Production at High Energy Colliders in the Littlest Higgs Model with T-Parity

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2018年第3期69卷 297-302页

作者： biao-feng Hou Hua-Ying Zhang Heng-Heng Bi College of Physics and Materials Science Henan Normal University Xinxiang 453007 China

In the littlest Higgs Model with T-parity,we discuss the Higgs production in association with bottom quarks at the LHC and future electron-positron *** calculate the cross sections of production channels pp→bb H,bb→H and bg→b H at 14 Te V LHC and the cross sections of production channel e^+e^-→bb H in(un)polarized beams at the lowest *** order to investigate the observability,we display some typical final state distributions in the Higgs to diphoton channel.

关键词： Higgs boson bottom quark littlest Higgs model with T-parity

Organic-inorganic fertilization promotes paddy soil macroaggregate organic carbon accumulation associated with key bacterial populations in subtropical China

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2024年第5期34卷 941-950页

作者： Jinhua ZHAO Lin CHEN Guixiang ZHOU Fang LI Jiabao ZHANG Congzhi ZHANG Donghao MA biao feng fengqiu Experimental Station of National Ecosystem Research Network of China State Key Laboratory of Soil and Sustainable AgricultureInstitute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China College of Resources and Environment Henan Agricultural UniversityZhengzhou 450002China

Macroaggregate organic carbon(Macro-OC)accumulation in paddy soils is of great significance in promoting multiple agroecosystem ***,the effects of different fertilization practices on Macro-OC accumulation in paddy soils at the regional scale have not been comprehensively ***,we conducted long-term fertilization field experiments at four sites,Taoyuan,Wangcheng,Jinxian,and Suzhou,in the subtropical area of China to reveal the effects of inorganic and organic-inorganic(OIF)fertilization on Macro-OC accumulation and its relationships with important microbial traits(the abundance ratio of GH48:cbhI genes and the richness of keystone bacterial taxa)in paddy *** results showed that long-term fertilization(particularly OIF)significantly increased the content of Macro-OC,which mainly consisted of particulate organic carbon(C).Organic-inorganic fertilization decreased the percentage of O-alkyl C but increased the percentages of alkyl,aromatic,and phenolic ***-inorganic fertilization promoted the abundance of the bacterial cellulose-degrading gene GH48 retrieved from *** orders Anaerolineales,Bacillales,and Clostridiales were identified as keystone bacterial taxa in macroaggregates and were significantly correlated with the physical fraction and chemical structure of *** equation modeling revealed that fertilization-induced changes in soil pH and C:N ratio affected the richness of Anaerolineales,Bacillales,and Clostridiales,which was strongly associated with the increase of percentages of aromatic and phenolic C and further facilitated Macro-OC ***,these results suggested that OIF promoted Macro-OC accumulation associated with key bacterial populations in paddy *** results provide an important basis for boosting soil C accrual in the subtropical rice-growing areas.

关键词： bacterial community keystone bacterial taxa mean weight diameter mineral-associated organic carbon particulate organic carbon structural equation modeling

Metabolic pathway databases and moot repositories

在线全文

学校读者我要写书评

暂无评论

Frontiers of Electrical and Electronic Engineering in China 2018年第1期6卷 30-39页

作者： Abraham A. Labena Yi-Zhou Gao Chuan Dong Hong-li Hua feng-biao Guo School of Life Science and Technology University of Electronic Science and Technology of China Chengdu 610054 China College of Computational and Naturay Sciences Dilla University Dilla P.O.box. 419 Et'hiopia School of Life Science and Technology Center for Informational Biology University of Electronic Science and Technology of China Chengdu 610054 China

Background： The number of biological Knowledge bases/databases storing metabolic pathway information and models has been growing rapidly. These resources are diverse in the type of information/data, the analytical tools, and objectives. Here we present a review of the most popular metabolic pathway databases and model repositories, focusing on their scope, content including reactions, enzymes, compounds, and genes, and applicability. The review aims to help researchers choose a suitable database or model repository according to the information and data required, by providing an insight look of each pathway resource. Results： Four pathways databases and three model repositories were selected on the basis of popularity and diversity. Our review showed that the pathway resources vary in many aspects, such as their scope, content, access to data and the tools. In addition, inconsistencies have been observed in nomenclature and representation of database entities. The three model repositories reviewed do not offer a brief description of the models＇ characteristics such as simulation conditions. Conclusions： The inconsistencies among the databases in representing their contents may hamper the maximal use of the knowledge accumulated in these databases in particular and the area of systems biology＇ at large. Therefore, it is strongly recommended that the database creators and the metabolic network models developers should follow international standards for the nomenclature of reactions and metabolites. Besides, computationally generated models that could be obtained from model repositories should be utilized with manual curations as they lack some important components that are necessary for full functionality of the models.

关键词： metabolic pathway database model repository

Robustness measurement of scale-free networks based on motif entropy

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第8期31卷 190-196页

作者： Yun-Yun Yang biao feng Liao Zhang Shu-Hong Xue Xin-Lin Xie Jian-Rong Wang College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024China Taiyuan University of Science and Technology Taiyuan 030024China School of Mathematical Sciences Shanxi UniversityTaiyuan 030024China

As a classical complex network model, scale-free network is widely used and studied. And motifs, as a high-order subgraph structure, frequently appear in scale-free networks, and have a great influence on the structural integrity, functional integrity and dynamics of the networks. In order to overcome the shortcomings in the existing work on the robustness of complex networks, only nodes or edges are considered, while the defects of high-order structure in the network are *** the perspective of network motif, we propose an entropy of node degree distribution based on motif to measure the robustness of scale-free networks under random attacks. The effectiveness and superiority of our method are verified and analyzed in the BA scale-free networks.

关键词： motif network robustness scale-free entropy