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Photonics Research 2016年第2期4卷 45-48页

作者： Z.y.xu y.H.Li L.J.Wang Joint Institute for Measurement Science Tsinghua University Shanghai Institute of Laser Plasma State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua University

We demonstrated long-period grating(LPG) inscription on polymer functionalized optical microfibers and its applications in optical sensing. Optical microfibers were functionalized with ultraviolet-sensitive polymethyl methacrylate jackets and, thus, LPGs could be inscribed on optical microfibers via point-by-point ultraviolet laser exposure. For a 2 mm long microfiber LPG(MLPG) inscribed on optical microfibers with a diameter of 5.4 μm, a resonant dip of 15 d B at 1377 nm was observed. This MLPG showed a high sensitivity of strain and axial force, i.e.,-1.93 pm∕με and-1.15 pm∕μN, respectively. Although the intrinsic temperature sensitivity of the LPGs is relatively low, i.e.,-12.75 pm∕°C, it can be increased to be-385.11 pm∕°C by appropriate sealing. Benefiting from the small footprint and high sensitivity, MLPGs could have potential applications in optical sensing of strain,axial force, and temperature.

关键词： MLPG Long-period grating inscription on polymer functionalized optical microfibers and its applications in optical sensing

Harvesting,sensing and regulating light based on photo-thermal effect of Cu@CuO mesh

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Green Energy & Environment 2017年第4期2卷 387-392页

作者： xuan Wu Jie xu George y.Chen Rong Fan Xiaokong Liu Haolan xu Future Industries Institute University of South Australia Mawson Lakes Campus Laser Physics and Photonic Devices Laboratories School of Engineering University of South Australia Mawson Lakes Campus School of Natural and Built Environments University of South Australia Mawson Lakes Campus

A system of light harvesting, sensing and regulating was designed based on the photo-thermal and Seebeck effect of flexible CuO nanostructures. Cu@CuO meshes were prepared via self-oxidation of Cu mesh and utilized as the photo-thermal material. Upon irradiation by visible light, the temperature of the Cu@CuO mesh dramatically increases. The temperature difference between the irradiated and non-irradiated parts of the Cu@CuO mesh produced a measurable voltage output due to the Seebeck effect. The generated voltage was then converted into a digital signal to control a rotary neutral-density disc to filter the received light. This enabled regulation of the intensity of the incident light at a selected region. This system is cost effective and has potential applications in greenhouses, factories and smart buildings to minimize energy consumption and improve wellbeing.

关键词： Photothermal Light CuO Nanostructure

Analytical and Numerical Modelling of FRP Debonding from Concrete Substrate under Pure Shearing

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Journal of Wuhan University of Technology(Materials Science) 2012年第1期27卷 142-148页

作者： PAN Jinlong xu Zhun C K y Leung LI Zongjin Key Laboratory of Concrete and Pre-stressed Concrete Structures of Ministry of Education Southeast UniversityNanjing 210096 Dept.of Civil and Environmental Engineering Hong Kong University of Science and TechnologyHongKongChina

External bonding of fiber reinforced polymer （FRP） composites on the concrete structures has been proved to be an effective and efficient way to strengthen concrete structures. For a FRP strengthened concrete beam, it is usually observed that the failure occurs in the concrete and a thin layer of concrete is attached on the surface of the debonded FRP plate. To study the debond behavior between concrete and FRP composites, an analytical model based on the three-parameter model is developed to study the debonding behavior for the FRP-to-concrete joint under pure shearing. Then, nonlinear FEM analysis is conducted to verify the PrOposed analytical model. The FEM results shows good agreement with the results from the model. Finally, with the analytical model, sensitivity analyses are performed to study the effect of the interracial parameters or the ~eometric parameters on the debondin~ behavior.

关键词： FRP composites debonding behavior analytical model nonlinear FEM analysis

Modeling and analysis of a catastrophic oil spill and vapor cloud explosion in a confined space upon oil pipeline leaking

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Petroleum Science 2020年第2期17卷 556-566页

作者： Shengzhu Zhang xu Wang y.Frank Cheng Jian Shuai China Academy of Safety Science and Technology Beijing 100012China Department of Mechanical Engineering University of CalgaryCalgaryAB T2N 1N4Canada College of Safety and Ocean Engineering China University of Petroleum(Beijing)Beijing 102249China

Oil spill-induced vapor cloud explosions in a confined space can cause catastrophic *** this work,investigation was conducted on the catastrophic pipeline leak,oil spill,and the resulting vapor cloud explosion accident occurring in China in 2013 by modeling analysis,field surveys,and numerical *** total amount of the spilled oil was up to2044.4 m3 due to improper *** long residence time of the oil remaining in a confined space permitted the formation of explosive mixtures and caused the vapor cloud explosion.A numerical model was developed to estimate the consequence of the explosion based on volatilization testing *** results show that the death-leading zone and the glass-breaking zone could be 18 m and 92 m,respectively,which are consistent with the field *** severity of the explosion is related to the amount of the oil spill,properties of oil,and volatilization *** is recommended that a comprehensive risk assessment be conducted to analyze the possible consequences upon oil spilling into a confined *** collection and ventilation measures should be taken immediately after the spill occurs to reduce the time for oil volatilization and prevent the mixture from reaching its explosive limit.

关键词： Pipeline leaking Oil spill Vapor cloud explosion Confined space Consequence analysis

Gap solitons of spin–orbit-coupled Bose–Einstein condensates in PT periodic potential

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Chinese Physics B 2022年第1期31卷 140-145页

作者： S Wang y H Liu T F xu Hebei Key Laboratory of Microstructural Material Physics School of ScienceYanshan UniversityQinhuangdao 066004China School of Science Yanshan UniversityQinhuangdao 066004China

We numerically investigate the gap solitons in Bose–Einstein condensates(BECs)with spin–orbit coupling(SOC)in the parity–time(PT)-symmetric periodic *** find that the depths and periods of the imaginary lattice have an important influence on the shape and stability of these single-peak gap solitons and double-peak gap solitons in the first band *** dynamics of these gap solitons are checked by the split-time-step Crank–Nicolson *** is proved that the depths of the imaginary part of the PT-symmetric periodic potential gradually increase,and the gap solitons become *** the different periods of imaginary part hardly affect the stability of the gap solitons in the corresponding parameter interval.

关键词： gap solitons spin–orbit coupling PT-symmetric periodic potential

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Lenalidomide regulates the CCL21/CCR7/ERK1/2 axis to inhibit migration and proliferation in diffuse large B-cell lymphoma

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Oncology research 2025年第1期33卷 199-212页

作者： Wen yang Bin Tang Dan xu Wenxiu yang Department of Pathology Guizhou Medical University The Affiliated Hospital of Guizhou Medical University Guiyang 550004 China.

Background:The prognostic significance of the chemokine receptor CCR7 in diffuse large B-cell lymphoma (DLBCL) has been reported previously. However, the detailed mechanisms of CCR7 in DLBCL, particularly regarding its interaction with lenalidomide treatment, are not fully understood.Methods:Our study utilized bioinformatics approaches to identify hub genes in SU-DHL-2 cell lines treated with lenalidomide compared to control groups. Immunohistochemical data and clinical information from 122 patients with DLBCL were analyzed to assess the correlation of CCR7 and p-ERK1/2 expression with the prognosis of DLBCL. Furthermore, and experiments were conducted to clarify the role of CCR7 in the response of DLBCL to lenalidomide treatment.Results:Our bioinformatics analysis pinpointed CCR7 as a hub gene in the context of lenalidomide treatment in DLBCL. Notably, 31.14% and 36.0% (44/122) of DLBCL cases showed positive expression for CCR7 and ERK1/2 respectively, establishing them as independent prognostic factors for adverse outcomes in DLBCL via multivariate Cox regression analysis. Additionally, our studies demonstrated that the external application of the protein CCL21 promoted proliferation, migration, invasion, and activation of the ERK1/2 pathway in SU-DHL-2 and OCI-Ly3 cell lines with high levels of CCR7 expression. This effect was mitigated by CCR7 silencing through siRNA, application of ERK inhibitors, or lenalidomide treatment. experiments reinforced the efficacy of lenalidomide, significantly reducing tumor growth rate, tumor mass, serum total LDH levels, and expression of CCR7 and p-ERK1/2 in a SU-DHL-2 xenograft model in nude mice ( y clarifies the potential role of the CCL21/CCR7/ERK1/2 axis in the therapeutic effects of lenalidomide in DLBCL treatment.

关键词： CCL21 CCR7 Diffuse large B-cell lymphoma (DLBCL) ERK1/2 Lenalidomide

Statistical moment-based structural damage detection method in time domain

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Earthquake Engineering and Engineering Vibration 2013年第1期12卷 13-23页

作者： J.Zhang y.L.xu J.Li y.Xia J.C.Li Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Department of Building Engineering Tongji University Faculty of Engineering University of Technology Sydney

A novel structural damage detection method with a new damage index,i.e.,the statistical moment-based damage detection（SMBDD） method in the frequency domain,has been recently *** aim of this study is to extend the SMBDD method in the frequency domain to the time domain for building structures subjected to non-Gaussian and non-stationary *** applicability and effectiveness of the SMBDD method in the time domainis verified both numerically and *** buildings with various damage scenarios are first numerically investigated in the time domain taking into account the effect of measurement *** applicability of the proposed method in the time domain to building structures subjected to non-Gaussian and non-stationary excitations is then experimentally investigated through a series of shaking table tests,in which two three-story shear building models with four damage scenarios *** identified damage locations and severities are then compared with the preset *** comparative results are found to be satisfactory,and the SMBDD method is shown to be feasible and effective for building structures subjected to non-Gaussian and non-stationary excitations.

关键词： damage detection statistical moment time domain non-Gaussian non-stationary experimental investigation

HIGHLy DISPERSED MULTI-WALLED CARBON NANOTUBES IN WATER/ETHANOL AND ITS APPLICATION FOR PVA COMPOSITE

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 389-396页

作者： X.y.Tao J.M.xu F.Liu G.L.xu InstituteofMaterialsPhysicsandMicrostructures DepartmentofMaterialsScienceandEngmeeringZhejiangUniversityHangzhou310027China CollegeofElectronicInformation HangzhouDianziUniversityHangzhou310018China

Two carboxylation processes were carried out to modify multi-walled carbon nanot ube bundles (m-MWNTs). The results showed that both of the m-MWNTs could be high ly dispersed in water with the concentration up to 25 and 15mg/mL in ethanol wit hout obvious deposition or conglomeration over 6 months. FTIR, Raman, TGA and TE M characterizations of the m- MWNTs showed that hydroxyl and carboxyl groups hav e been attached with MWNTs, and that the nanotube structure was only damaged a l ittle after modification treatments in mixed acids over 24h. Above prepared nano tube suspensions in water were successfully used as a filler of thermoplastic PV A composite to enhance its electrical conductivity. The results showed that the addition of m-MWNTs greatly improved the conductivity and the threshold of mass fraction was about 5wt%. The results also proved that purification process was n ot needed because of high purity of the raw MWNTs prepared in our group.

关键词： carbon nanotube polyvinylalcohol composite conductivity

Amplitude modulation and extreme events in turbulent channel flow

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Acta Mechanica Sinica 2018年第1期34卷 1-9页

作者： y.C.yao W.X.Huang C.X.xu AML Department of Engineering Mechanics Tsinghua University

Amplitude modulation of near-wall turbulence by large-scale structures in the outer layer is investigated by direct numerical simulation of turbulent channel flows at Reynolds number Re= 540, 1000, 2000. The effect of modulation is obvious in the two-point cross-section correlation map, and the correlation coefficients increase significantly with the Reynolds number. The influence of modulation is reflected in the tail of the probability density function of the near-wall flow signals, which expands as the Reynolds number increases. The flatness factor provides a quantitative description of the high fluctuation events due to modulation. Vortical structures associated with modulation are revealed by conditionally averaging the flow field of the near-wall extreme events, providing a depiction of how the influence of the large-scale structures penetrate towards the near-wall region.

关键词： Wall turbulence Amplitude modulation Flatness Extreme events

Active Network Supports for Mobile IP

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Journal of Computer Science & Technology 2001年第6期16卷 544-551页

作者： Lu, y. Qian, D. xu, B. Wang, L. Dept. of Computer Science and Eng. Xi'an Jiaotong University Xi'an 710049 China

The basic mobile IP protocol is difficult to implement on the traditional IP network and not flexible and efficient under certain conditions. For example, firewalls or bound- ary routers may drop packets sent by mobile nodes for security reasons. Traditional networking devices such as routers cannot dynamically load and unload extended services to achieve differ- ent qualities of services. In this paper, a new scheme of using the active network to support the mobile IP is presented. The Softnet, a prototype of active networks based on mobile agents, is introduced. The active network is characterized by the programmability of its intermediate nodes and therefore presents dynamic and flexible behaviors. Special services can be dynam- ically deployed onto the active nodes in the Softnet. This property is definitely required in implementing the mobile IP protocols. The Softnet supports not only the basic mobile IP pro- tocol but also other extended mobiIe IP protocols. Virtual networks for mobile IP services are dynamically formed by mobile agents in the Softnet to provide different qualities of services.

关键词： mobile IP Softnet active network mobile agent virtual network