Continuous deformation measurement for track based on distributed optical fiber sensor

He, Jianping,Li, Peigang,Zhang, Shihai Techno-Press 2020 Structural monitoring and maintenance Vol.7 No.1

Railway tracks are the direct supporting structures of the trains, which are vulnerable to produce large deformation under the temperature stress or subgrade settlement. The health status of track is critical, and the track should be routinely monitored to improve safety, lower the risk of excess deformation and provide reliable maintenance strategy. In this paper, the distributed optical fiber sensor was proposed to monitor the continuous deformation of the track. In order to validate the feasibility of the monitoring method, two deformation monitoring tests on one steel rail model in laboratory and on one real railway tack in outdoor were conducted respectively. In the model test, the working conditions of simply supported beam and continuous beam in the rail model under several concentrated loads were set to simulate different stress conditions of the real rail, respectively. In order to evaluate the monitoring accuracy, one distributed optical fiber sensor and one fiber Bragg grating (FBG) sensor were installed on the lower surface of the rail model, the strain measured by FBG sensor and the strain calculated from FEA were taken as measurement references. The model test results show that the strain measured by distributed optical fiber sensor has a good agreement with those measured by FBG sensor and FEA. In the outdoor test, the real track suffered from displacement and temperature loads. The distributed optical fiber sensor installed on the rail can monitor the corresponding strain and temperature with a good accuracy.

Magnetic Assembly of Nonmagnetic Particles into Photonic Crystal Structures

He, Le,Hu, Yongxing,Kim, Hyoki,Ge, Jianping,Kwon, Sunghoon,Yin, Yadong American Chemical Society 2010 NANO LETTERS Vol.10 No.11

<P>We report the rapid formation of photonic crystal structures by assembly of uniform nonmagnetic colloidal particles in ferrofluids using external magnetic fields. Magnetic manipulation of nonmagnetic particles with size down to a few hundred nanometers, suitable building blocks for producing photonic crystals with band gaps located in the visible regime, has been difficult due to their weak magnetic dipole moment. Increasing the dipole moment of magnetic holes has been limited by the instability of ferrofluids toward aggregation at high concentration or under strong magnetic field. By taking advantage of the superior stability of highly surface-charged magnetite nanocrystal-based ferrofluids, in this paper we have been able to successfully assemble 185 nm nonmagnetic polymer beads into photonic crystal structures, from 1D chains to 3D assemblies as determined by the interplay of magnetic dipole force and packing force. In a strong magnetic field with large field gradient, 3D photonic crystals with high reflectance (83%) in the visible range can be rapidly produced within several minutes, making this general strategy promising for fast creation of large-area photonic crystals using nonmagnetic particles as building blocks.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2010/nalefd.2010.10.issue-11/nl103008v/production/images/medium/nl-2010-03008v_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl103008v'>ACS Electronic Supporting Info</A></P>

Overlapped Segmental Clipping for the PAPR Reduction of the OFDM-OQAM system

( Jianping Wang ),( Jing Yan ),( Zhen He ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.8

Orthogonal frequency division multiplexing with offset quadrature amplitude modulation (OFDM-OQAM) technique has drawn significant interests in recent years. However, most of the existing OFDM peak-to-average ratio (PAPR) reduction schemes cannot be used in the OFDM-OQAM system directly. In this paper, a modified scheme called overlapped segmental clipping (OS-clipping) is proposed to deal with the high PAPR problem specifically in the OFDM-OQAM system. For the proposed OS-clipping scheme, the input signals are divided into a number of overlapped segments and then the clipping operation is processed on each segment. Simulation results show that the modified scheme used in the OFDM-OQAM system can provide better performance than conventional clipping scheme directly used in the OFDM-OQAM system, and even outperforms conventional clipping scheme applied in the OFDM system.

Three dimensional reconstruction and measurement of underwater spent fuel assemblies

Zhao Jianping,He Shengbo,Yang Li,Feng Chang,Wu Guoqiang,Cai Gen 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.10

It is an important work to measure the dimensions of underwater spent fuel assemblies in the nuclear power industry during the overhaul, to judging whether the spent fuel assemblies can continue to be used. In this paper, a three dimensional reconstruction method for underwater spent fuel assemblies of nuclear reactor based on linear structured light is proposed, and the topography and size measurement was carried out based on the reconstructed 3D model. Multiple linear structured light sensors are used to obtain contour size data, and the shape data of the whole spent fuel assembly can be collected by onedimensional scanning motion. In this paper, we also presented a corrected model to correct the measurement error introduced by lead-glass and water is corrected. Then, we set up an underwater measurement system for spent fuel assembly based on this method. Finally, an underwater measurement experiment is carried out to verify the 3D reconstruction ability and measurement ability of the system, and the measurement error is less than ±0.05 mm.

A Study on Multivariable Optimization in Precision Manufacturing Using MOPSONNS

Zhaopeng He,Tielin Shi,Jianping Xuan,Su Jiang,Yinfeng Wang 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.11

7075 aluminum alloy has been widely applied in the field of aerospace and marine sheet metal because of its protruding mechanical and corrosion resistance. In this paper, the problem of selecting optimal process parameters to optimize multiple processing variables had been studied in precision manufacturing. Multi-objective particle swarm optimized neural networks system was put forward to determine the optimal cutting conditions with multi-objective particle swarm algorithm and multiple neural networks as prediction models of machining variables. Precision parts manufacturing of 7075 aluminum alloy would go through two operations of material removal and surface forming. Firstly, optimal cutting conditions were determined to minimize tool wear while maximizing metal removal rate in material removal stage. Secondly, it was significant and meaningful to select optimal cutting conditions corresponding to the best surface quality and minimum root mean square of tool vibration in surface forming stage. Orthogonal experiments had been carried out to observe the relationship between machining-related variables and cutting parameters in detail. Multiple neural networks were trained to establish predictive models of cutting process from orthogonal experimental and statistical data. Maximum deviation theory sorted the Pareto solutions searched by optimization process of neural networks driven by multi-objective particle swarm algorithm. The top ranking Pareto solutions had been determined as the optimal cutting parameters combination for material removal and surface forming stages, respectively. Finally, the proposed optimization system can also be used to optimize the processing of other difficult-to-machine materials.

Properties of CuInxGa1−xSe2 thin films grown from electrodeposited precursors with different levels of selenium content

Feng Kang,Jianping Ao,Guozhong Sun,Qing He,Yun Sun 한국물리학회 2010 Current Applied Physics Vol.10 No.3

In this paper, polycrystalline CuInxGa1xSe2 (CIGS) thin film absorbers were prepared by selenizing electrodeposited (ED) precursors with two different levels of selenium content: rich in selenium and poor in selenium. Comparing the results obtained by X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM) and illuminated current–voltage (J–V), it was found that absorber layers processed from Se-poor ED precursors shows better crystalline quality and increased gallium incorporation,which thus improved cell performance, compared to the layers grown using Se-rich ED precursors. The best cell fabricated from Se-poor ED precursor shows a conversion efficiency of 1.63% at AM1.5 global light.

Young Schema Questionnaire: Factor Structure and Specificity in Relation to Anxiety in Chinese Adolescents

Yulei Yan,Jianping Wang,Wei Yu,Li He,Tian P.S. Oei 대한신경정신의학회 2018 PSYCHIATRY INVESTIGATION Vol.15 No.1

ObjectiveaaThe goal of this study was to examine the factor structure of Young Schema Questionnaire-short form (YSQ-SF) in a sample of Chinese adolescents, and to explore which maladaptive schemas were associated with anxiety symptoms. MethodsaaYSQ-SF was administered to 983 nonclinical Chinese adolescents aged 13–17 years. Confirmatory factor analyses with weighted least squares means and variance adjusted estimation were conducted to examine the factor structure of YSQ-SF. Stepwise regression analyses were performed to identify schemas associated with anxiety symptoms. ResultsaaA bifactor model with 15 correlated factors fitted the data better than other priori defined models. Stepwise regressions showed Vulnerability to harm, Abandonment, Emotional inhibition, Subjugation, and Unrelenting standards schemas were associated with anxiety symptoms. Furthermore, different anxiety symptoms were associated with common and distinctive schemas. ConclusionaaMaladaptive schemas were already stably formed in Chinese adolescents, however there’s no robust evidence for the existence of domain. The explanatory value of maladaptive schemas for understanding psychopathology of anxiety in adolescence is discussed.

[Ru(phen)2(dppz)]2+ Assemble on the Surface of the SDS Micelle and Its Application for the Determination of DNA

Fang Chen*,Jianping Huang,Zhike He 대한화학회 2006 Bulletin of the Korean Chemical Society Vol.27 No.10

The solution of [Ru(phen)2(dppz)]2+ and SDS has high Resonance Light Scattering (RLS) signals due to [Ru(phen)2(dppz)]2+ assemble on the surface of the SDS micelle. Because of the high affinity (KB ³ 106 L mol-1) between [Ru(phen)2(dppz)]2+ and DNA, the adding of DNA in the solution of [Ru(phen)2(dppz)]2+-SDS makes the dissociation of [Ru(phen)2(dppz)]2+-SDS, and results in decreasing of the RLS signals and increasing of the absorbance. Based on this, a novel method is proposed for DNA assay. Under optimum condition, good linear relationship was obtained within the concentration range of 0.018-1.26 mg mL-1, the linear equation is IRLS = 504.8-348.8 c (c: mg mL-1) and the correlation coefficient (r) is 0.9992. The detect limit for calf thymus DNA is 8.6 ng mL-1. The proposed method was successful applied to determine the extracted colibacillus plasmid DNA.

A Resting-state Functional Magnetic Resonance Imaging Study of Whole-brain Functional Connectivity of Voxel Levels in Patients With Irritable Bowel Syndrome With Depressive Symptoms

( Jie Li ),( Ping He ),( Xingqi Lu ),( Yun Guo ),( Min Liu ),( Guoxiong Li ),( Jianping Ding ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2021 Journal of Neurogastroenterology and Motility (JNM Vol.27 No.2

Background/Aims Depressive symptom is one of the most common symptoms in patients with irritable bowel syndrome (IBS), but its pathogenetic mechanisms remain unclear. As a voxel-level graph theory analysis method, degree centrality (DC) can provide a new perspective for exploring the abnormalities of whole-brain functional network of IBS with depressive symptoms (DEP-IBS). Methods DC, voxel-wise image and clinical symptoms correlation and seed-based functional connectivity (FC) analyses were performed in 28 DEP-IBS patients, 21 IBS without depressive symptoms (nDEP-IBS) patients and 36 matched healthy controls (HC) to reveal the abnormalities of whole brain FC in DEP-IBS. Results Compared to nDEP-IBS patients and HC, DEP-IBS patients showed significant decrease of DC in the left insula and increase of DC in the left precentral gyrus. The DC’s z-scores of the left insula negatively correlated with depression severity in DEP-IBS patients. Compared to nDEP-IBS patients, DEP-IBS patients showed increased left insula-related FC in the left inferior parietal lobule and right inferior occipital gyrus, and decreased left insula-related FC in the left precentral gyrus, right supplementary motor area (SMA), and postcentral gyrus. In DEP-IBS patients, abstracted clusters’ mean FC in the right SMA negatively correlated with depressive symptoms. Conclusions DEP-IBS patients have abnormal FC in brain regions associated with the fronto-limbic and sensorimotor networks, especially insula and SMA, which explains the vicious circle between negative emotion and gastrointestinal symptoms in IBS. Identification of such alterations may facilitate earlier and more accurate diagnosis of depression in IBS, and development of effective treatment strategies. (J Neurogastroenterol Motil 2021;27:248-256)

[Ru(phen)₂(dppz)]²⁺ Assemble on the Surface of the SDS Micelle and Its Application for the Determination of DNA

Chen, Fang,Huang, Jianping,He, Zhike Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.10

The solution of $[Ru(phen)_2(dppz)]^{2+}$ and SDS has high Resonance Light Scattering (RLS) signals due to $[Ru(phen)_2(dppz)]^{2+}$ assemble on the surface of the SDS micelle. Because of the high affinity ($KB\geq10^6\;L\;mol^{-1}$) between $[Ru(phen)_2(dppz)]^{2+}$ and DNA, the adding of DNA in the solution of $[Ru(phen)_2(dppz)]^{2+}$-SDS makes the dissociation of $[Ru(phen)_2(dppz)]^{2+}$-SDS, and results in decreasing of the RLS signals and increasing of the absorbance. Based on this, a novel method is proposed for DNA assay. Under optimum condition, good linear relationship was obtained within the concentration range of 0.018-1.26 $\mu g\;mL^{-1}$, the linear equation is $I_{RLS}$ = 504.8-348.8 c (c: $\mu g\;mL^{-1}$) and the correlation coefficient (r) is 0.9992. The detect limit for calf thymus DNA is 8.6 ng $mL^{-1}$. The proposed method was successful applied to determine the extracted colibacillus plasmid DNA.