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Full-Scale Prestress Loss Monitoring of Damaged RC Structures Using Distributed Optical Fiber Sensing Technology
Chunguang Lan,Zhi Zhou,Jinping Ou
Sensors , 2012, DOI: 10.3390/s120505380
Abstract: For the safety of prestressed structures, prestress loss is a critical issue that will increase with structural damage, so it is necessary to investigate prestress loss of prestressed structures under different damage scenarios. Unfortunately, to date, no qualified techniques are available due to difficulty for sensors to survive in harsh construction environments of long service life and large span. In this paper, a novel smart steel strand based on the Brillouin optical time domain analysis (BOTDA) sensing technique was designed and manufactured, and then series of tests were used to characterize properties of the smart steel strands. Based on prestress loss principle analysis of damaged structures, laboratory tests of two similar beams with different damages were used to verify the concept of full-scale prestress loss monitoring of damaged reinforced concrete (RC) beams by using the smart steel strands. The prestress losses obtained from the Brillouin sensors are compared with that from conventional sensors, which provided the evolution law of prestress losses of damaged RC beams. The monitoring results from the proposed smart strand can reveal both spatial distribution and time history of prestress losses of damaged RC beams.
Integrated Optical Fiber Sensing System by Combing Large-Scale Distributed BOTDA/R and Localized FBGs
Zhi Zhou,Jianping He,Jinping Ou
International Journal of Distributed Sensor Networks , 2012, DOI: 10.1155/2012/804394
Abstract:
Integrated Optical Fiber Sensing System by Combing Large-Scale Distributed BOTDA/R and Localized FBGs
Zhi Zhou,Jianping He,Jinping Ou
International Journal of Distributed Sensor Networks , 2012, DOI: 10.1155/2012/804394
Abstract: Structural health monitoring (SHM) has been regarded as a significant tool for the safety of civil infrastructures. Local fiber Bragg grating (FBG) sensor and distributed Brillouin optical fiber sensor have been successfully applied in civil engineering fields. Unfortunately, neither single FBG nor single Brillouin sensing technique can satisfy the requirements of simultaneously positioning full-scale structural damages and accurate local damage details. So it still matters to establish balance between localized high-precision measurement and large-scale distributed measurement with lower accuracy. This paper introduces an integration system by combining distributed Brillouin and local FBG sensors on one single-mode optical fiber. The temperature self-compensation and the data processing method of the integration system have been investigated. The integrated FBG/Brillouin sensor has been further packaged by glass fiber-reinforced polymer to be used as a robust and smart structural component. Finally the proposed integrated sensing system has been applied in three case studies, including investigation of reinforced concrete beam, smart cable, and smart steel strand to verify the feasibility. The test results illustrate that the integrated system can simultaneously provide accurate strain measurement at critical points by FBGs and the rough distributed strain measurement by Brillouin sensor, which can be further applied to various applications. 1. Introduction In the last two decades, a large amount of critical infrastructures, characterized as high cost, large scale and required long service life, have been built all over the world. These critical structures are expected to survive after a long-term service and during or even the rare events such as earthquakes and fires. To secure the survivability of the critical structures in a long run, their health conditions need to be monitored and assessed in real time. Thus, structural health monitoring (SHM) technology has attracted considerable interests worldwide. SHM systems have been successfully deployed to understand the loads, environmental changes, and structural behaviors, which have also been applied to a number of case studies, for example, structural behavior monitoring of Guangzhou TV Tower, Water Cube, and Tsing Ma Bridge [1–6]. In general, damages are randomly distributed through the structure, and their locations are usually hidden. Also, the structural damages are time dependent and interrelated with various factors. Thus, a cost-effective SHM system is desired to provide damage distribution
Development of a drtqPCR Assay for Differentiation of PCV-2a and 2b in Shanghai Area  [PDF]
Jian Liu, Feifei Ge, Houbing Ju, Dequan Yang, Xin Li, Jian Wang, Peihong Liu, Jinping Zhou
Open Journal of Veterinary Medicine (OJVM) , 2014, DOI: 10.4236/ojvm.2014.412035
Abstract: A dual real-time quantitative polymerase chain reaction assay (drtqPCR) was established to detect and differentiate between Porcine circovirus-2a (PCV-2a) and Porcine circovirus-2b (PCV-2b). Genotype-specific primer sets and probes were designed by using sequence data published for different PCV-2 strains. Specificity and sensitivity of the drtqPCR were examined by using PCV-2 isolates with known genotype. Among 367 tissue samples, 44.69% (164/367) were PCV-2 positive. From 164 PCV-2 positive samples, 10.98% (18/164), 92.56% (137/164), and 3.31% (9/164) were positive for PCV-2a, PCV-2b, and both genotypes, respectively. These results suggest that the dif-ferential drtqPCR can be used to detect PCV-2 and to differentiate the 2 genotypes from field sam-ples. The PCV-2 infection is quite common in swine of Shanghai area. Furthermore, the PCV-2b infective ratio is far higher than PCV-2a, and PCV-2a/2b mixed infections are also observed but at a lower prevalence in Shanghai area.
THE MONOTONE CONVERGENCE AND CONVERGENCE RATE ANALYSIS FOR DOMAIN DECOMPOSITION METHODS SOLVING UNILATERAL OBSTACLE PROBLEMS
单障碍问题区域分解法的单调收敛性与收敛速度估计

Zeng Jinping,Zhou Shuzi,
曾金平
,周叔子

计算数学 , 2002,
Abstract: Multiplicative and additive domain decomposition methods for solving unilateral obstacle problems are presented in the paper. When the initial is a low-solution(super-solution), we show that the iterates produced by the algorithms converge to the solution of the problem monotonically. Moreover we give a iterate error estimate for multiplicative algorithm.
Consensus of the Distributed Varying Scale Wireless Sensor Networks
Jinping Mou,Wuneng Zhou,Tianbo Wang,Chuan Ji
Mathematical Problems in Engineering , 2013, DOI: 10.1155/2013/862518
Abstract:
Dust Effect on the Performance of Wind Turbine Airfoils  [PDF]
Nianxin Ren, Jinping Ou
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2009, DOI: 10.4236/jemaa.2009.12016
Abstract: The full two-dimensional Navier-Stokes algorithm and the SST k-? turbulence model were used to investigate incom-pressible viscous flow past the wind turbine two-dimensional airfoil under clean and roughness surface conditions. The NACA 63-430 airfoil is chosen to be the subject, which is widely used in wind turbine airfoil and generally located at mid-span of the blade with thickness to chord length ratio of about 0.3. The numerical simulation of the airfoil under clean surface condition has been done. As a result, the numerical results had a good consistency with the experimental data. The wind turbine blade surface dust accumulation according to the operational periods in natural environment has been taken into consideration. Then, the lift coefficients and the drag coefficients of NACA 63-430 airfoil have been computed under different roughness heights, different roughness areas and different roughness locations. The role that roughness plays in promoting premature transition to turbulence and flow separation has been verified by the numeri-cal results. The trends of the lift coefficients and the drag coefficients with the roughness height and roughness area increasing have been obtained. What’s more, the critical values of roughness height, roughness area, and roughness location have been proposed. Furthermore, the performance of the airfoil under different operational periods has been simulated, and an advice for the period of cleaning wind turbine blades is proposed. As a result, the numerical simula-tion method has been verified to be economically available for investigation of the dust effect on wind turbine airfoils.
Set-Valued Stochastic Integrals with Respect to Finite Variation Processes  [PDF]
Jinping Zhang, Jiajia Qi
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.39A1003
Abstract:

In a Euclidean space Rd, the Lebesgue-Stieltjes integral of set-valued stochastic processes \"\" with respect to real valued finite variation process \"\" is defined directly by employing all integrably bounded selections instead of taking the decomposable closure appearing in some existed references. We shall show that this kind of integral is measurable, continuous in t under the Hausdorff metric and L2-bounded.

(?)-Epigallocatechin gallate inhibits endotoxin-induced expression of inflammatory cytokines in human cerebral microvascular endothelial cells
Jieliang Li, Li Ye, Xu Wang, Jinping Liu, Yizhong Wang, Yu Zhou, Wenzhe Ho
Journal of Neuroinflammation , 2012, DOI: 10.1186/1742-2094-9-161
Abstract: The expression of TNF-α, IL-1β and monocyte chemotactic protein-1 (MCP-1/CCL2) was determined by quantitative real time PCR (qRT-PCR) and ELISA. Intercellular adhesion molecule 1 (ICAM-1) and vascular cell adhesion molecule (VCAM) in hCMECs were examined by qRT-PCR and Western blotting. Monocytes that adhered to LPS-stimulated endothelial cells were measured by monocyte adhesion assay. Tight junctional factors were detected by qRT-PCR (Claudin 5 and Occludin) and immunofluorescence staining (Claudin 5 and ZO-1). The permeability of the hCMEC monolayer was determined by fluorescence spectrophotometry of transmembrane fluorescin and transendothelial electrical resistance (TEER). NF-kB activation was measured by luciferase assay.EGCG significantly suppressed the LPS-induced expression of IL-1β and TNF-α in hCMECs. EGCG also inhibited the expression of MCP-1/CCL2, VCAM-1 and ICAM-1. Functional analysis showed that EGCG induced the expression of tight junction proteins (Occludin and Claudin-5) in hCMECs. Investigation of the mechanism showed that EGCG had the ability to inhibit LPS-mediated NF-κB activation. In addition, 67-kD laminin receptor was involved in the anti-inflammatory effect of EGCG.Our results demonstrated that LPS induced inflammatory cytokine production in hCMECs, which could be attenuated by EGCG. These data indicate that EGCG has a therapeutic potential for endotoxin-mediated endothelial inflammation.
The constitutes and isomer distribution of di-(potassium sulfonate)-di-phthalimidomethyl phthalocyanine zinc
Wang Jian,Liu Hong,Xue JinPing,Jiang Zhou,Chen NaiSheng,Huang JinLing
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0223-7
Abstract: Sulfonate and/or phthalimidomethyl phthalocyanine zincs are obtained by the condensation reaction of anhydrous zinc acetate and two precursors, i.e. 4-phthalimidomethyl phthalonitrile and 4-(potassium sulfonated) phthalonitrile. The ZnPcS n P m mixture was separated into 5 components according to the number of substituted sulfonate groups and each component which has the same chemical constituent consists of different regioisomers. An HPLC method in isocratic conditions was developed to exercise quality control and make quantitative analysis of the photosensitizer, di-(potassium sulfonate)-diphthalimidomethyl phthalocyanine zinc (abbreviated as ZnPcS2P2, here, S represents sulfonate group, P the phthalimidomethyl group and ZnPc the phthalocyanine zinc). Furthermore, by comparing the retention behavior of ZnPcS2P2 with that of ZnPcS2, positional structure of isomers of ZnPcS2P2 was speculated. Reversed-phase HPLC method with TEA-phosphate buffer and DMF as eluents in gradient conditions has been proved to be a powerful tool for the separation of such complex system.
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