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Wide Absorption Spectrum Measuring Methods by DFB-LDs in Water Vapor Detection System

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Photonic Sensors 2014年第3期4卷 230-235页

作者： Y. N. LIU j. CHANG j. lian Q. WANG G. P. LV W. j. WANG Z. LIU X. Z. LIU S. S. ZHANG Z. L. WANG S. j.ANG C. G. ZHU W. WEI B.N. SUN School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology andApplication Shandong University Jinan 250100 China Institute of Automation Shandong Academy of Sciences Jinan 250014 China

Two measuring methods of the wide absorption spectrum by distributed feedback laser diodes （DFB-LDs） are presented in detecting the water vapor absorption line. One is the subsection scanning method, and it takes advantage of the wide spectrum tuning range by the temperature modulation and fast spectrum tuning speed by current modulation. Specifically, this method is realized by dividing a target spectral region into several sections which correspond to the specific temperature of DFB-LD, scanning every section by current modulation for hundreds times, and averaging the data to raise the signal to noise ratio （SNR）, then combining all sections to get the whole spectrum. An accuracy of 10ppmv had been obtained in the measurement of water vapor with a 10-cm path length by this method. Another is data fitting method, based on the absorption line-shape function; the absorption line can be described by fitting with partial measured data. The fitting absorption line was fitted well with the measured data, and the square of correlation coefficient （R-square） was no less than 0.99.

关键词： DFB-LD wide spectrum subsection scanning data fitting water vapor detection

Self-assembly of Metal Phthalocyanines on Different Metal Substrates

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Self-assembly of Metal Phthalocyanines on Different Metal Su...

Structural and electrical properties of CeO2/Si with nitrided interfacial layer by nitrogen ion beam bombardment

第18届国际真空大会

作者： Y. H. j.ang j. C. lian L. W. Liu Z. H. Cheng L. Gao W. D. Xiao S. X. Du and H.-j. Gao* Institute of Physics Chinese Academy of Sciences Beij.ng 100190 China

＜正＞The self-assembly of organic molecules at solid surfaces has made tremendous progresses in the development of organic nanometer-sized devices. Among these organic molecular building blocks,

关键词： Self-assembly Metal phthalocyanines Scanning tunneling microscopy and spectroscopy Kondo resonance.

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Structural and electrical properties of CeO2/Si with nitride...

Further mechanism of α/β interphase boundary evolution and dynamic globularization of Ti–5Al–2Sn–2Zr–4Mo–4Cr at elevated temperature deformation

2001 6～(th) International Conference on Solid-State and Integrated Circuit Technology

作者： j.nfeng Kang, Xiaoyan Liu, Ruqi Han, Yangyuan Wang, G. j. lian, Kun Xun, D. P. Yu, G. C. Xiong,S. C. Wu, Y. G. Wang Institute of Microelectronics, Peking University, Beij.ng 100871, P. R. China,Department of Physics, Peking University, Beij.ng 100871, P. R. China Beij.ng Electron Microscopy Laboratory, Chinese Academy of Science, Beij.ng 100080, P. R. China

The effects of nitrided interfacial layerbetween CeO-Si on the interfacial properties *** process of nitrogen ion beambombardment (NIBB) was used to form the nitridedielectric-Si *** CeO high-k dielectricfilms were grown on Si(100)substrates by pulsed laserdeposition(PLD)and the capacitors with Pt/CeO/Sistructure were *** atomic forcemicroscopy(AFM),x-ray photoelectron spectroscopy(XPS),high-resolution transmission electronmicroscopy(HRTEM),capacitance-voltage (C-V),andcurrent-voltage(I-V) methods were used to study theinterfacial characteristics of the *** resultsshowed that a SiN,O layer was formed on Si surfaceby the NIBB *** nitride layer between CeOand Si can suppress the further formation of interfaciallayer between CeO and Si,which is helpful toimprove the structural and electrical characteristics ofCeO-Si interface.

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Progress in Natural Science:Materials International 2022年第4期32卷 490-497页

作者： lian Li Miaoquan Li School of Materials Science and Engineering Northwestern Polytechnical University

The evolution characterization of the α/β interphase boundaries of the isothermally compressed Ti–5Al–2Sn–2Zr–4Mo–4Cr with lamellar microstructure was carried out via electron backscatter diffraction(EBSD) and transmission electron microscope(TEM). The effect of the α/β interphase boundary evolution on the dynamic globularization was discussed, and the nucleation model for the β recrystallized grain at the cusp of αlath in the late stage of deformation in terms of the classic nucleation theory was established. The mean α/βinterface deviation angle from Burgers orientation relationship(BOR) increased continuously up to 18.9°with the increasing strain from 0.1 to 0.5, which was dominated by the continuous dynamic recrystallization. Restoration of BOR between α and β phases at the strains of 0.7 and 0.9 occurred due to the occurrence of recrystallized α andβ grains following BOR, which was rationalized by a nucleation model considering the stored energy of deformation provided the driving force for nucleation at the cusp of α lath. Loss of coherency of α/β interphase boundaries at a strain about 0.3 was responsible for accelerating the dynamic globularization of α lamellae since the energy of α/β interphase boundaries increased up to the maximum value when the non-coherent α/β interphase boundaries were formed. Restoration of coherency of α/β interphase boundaries due to the recrystallization nucleation in the late stage of deformation did not substantially affect the dynamic globularization since the α/αintraphase high-angle boundaries(HAGBs) were formed and the most α/β interphase boundaries were noncoherent.

关键词： Titanium Interphase boundary Burgers orientation relationship Dynamic recrystallization Dynamic globularization Model

Validation of an improved two-fluid model with particle rotation for gas-solid fluidized bed

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Particuology 2023年第10期81卷 149-161页

作者： lian Wang Xihua Chu School of Civil Engineering Wuhan UniversityWuhan430072HubeiChina

Gas-solid fluidized beds are widely applied in chemical and process *** is of significance to establish a reasonable and effective mathematical model to explore the hydrodynamics of gas-particle system for industrial *** a less computationally demanding alternative to the discrete descriptions,two-fluid model considering kinetic theory of granular flow is often adopted to describe the fluidized behaviors of particles,but it cannot characterize the rotation of particles and its influence on the fluidized *** this study,to address the rotation effect of the fluidized particles,a two-fluid model combining the classical fluid and micropolar fluid is established,namely *** the CMTFM,classical fluid is used to describe the motion of gas phase,while micropolar fluid is adopted to describe the motion of particle phase,and the rotation of particles and its influence on the hydrodynamics of the gas-particle system are characterized by the degree of freedom of microrotation and the improved drag force based on micropolar *** the calculation of the gas-solid bubbling fluidized bed,we investigated the influence of the microstructure parameters,particle-particle collision restitution coefficient and inlet velocity,and the results are compared to those from TFM model and *** the analysis,it manifests that pressure drop and expansion height of the fluidized bed under the consideration of the microrotation effect are closer to the experiments,which demonstrates the feasibility and advantage of the classical-micropolar two-fluid model.

关键词： Gas-solid fluidized bed Two-fluid model Micropolar fluid Microstructure parameter Fluidized behaviors

A copula-based approach to accommodate intra-household interaction in workers' daily maintenance activity stop generation modeling

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j.urnal of Traffic and Transportation Engineering(English Edition) 2022年第1期9卷 59-68页

作者： You-lian Chu Parsons Transportation Group New YorkNY 10005USA

A new stop frequency model was developed to predict the daily number of maintenance activity stops made by individual household heads during a typical weekday. This new model was based on the modification of a conventional multivariate ordered probit(MOP) model by maintaining the probit assumption for the marginal distributions while introducing nonnormal dependence among the error terms using copula functions. Therefore, the copulabased MOP model would relieve the restriction of imposing j.int normality on the error terms in the conventional MOP model. The new MOP model would not only account for the intrahousehold interactions in stop-making decisions, but also allow the best functional form to be determined for representing dependencies among household heads. Using the New York Metropolitan Transportation Council’s 2010/2011 regional household travel survey data, the copula-based MOP model was employed to examine stop-making behavior for individual household heads residing in New York City and its adj.cent counties in Mid-Hudson Valley and New j.rsey. Empirical results provided useful insights into the observed effects of sociodemographics, land use density, transportation service, and work schedule together with potential unobserved common effects on the inter-relatedness of spousal stop-making decisions at the household level. The results show that the MOP model with a Clayton copula structure provides the best data fits and there is a very strong positive dependence among error terms of stop-making equations. Furthermore, the dependence among the maintenance activity propensities of household heads is asymmetric, with a stronger tendency of household heads to simultaneously have low maintenance activity levels than to simultaneously have high maintenance activity levels.

关键词： Stop-making propensity Maintenance activity episodes Multivariate ordered probit model Copula-based approach Intra-household interaction

A SIMPLE SMOOTH EXACT PENALTY FUNCTION FOR SMOOTH OPTIMIZATION PROBLEM

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j.urnal of Systems Science & Complexity 2012年第3期25卷 521-528页

作者： Shuj.n lian liansheng ZHANG College of Operations and Management Qufu Normal University Department of Mathematics Shanghai University

For smooth optimization problem with equMity constraints, new continuously differentiable penalty function is derived. It is proved exact in the sense that local optimizers of a nonlinear program are precisely the optimizers of the associated penalty function under some nondegeneracy assumption. It is simple in the sense that the penalty function only includes the obj.ctive function and constrained functions, and it doesn＇t include their gradients. This is achieved by augmenting the dimension of the program by a variable that controls the weight of the penalty terms.

关键词： Constrained optimization exact penalty function smooth penalty function.

Low-light image enhancement algorithm using a residual network with semantic information

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The j.urnal of China Universities of Posts and Telecommunications 2022年第2期29卷 52-62,84页

作者： Duan lian Tang Guij.n j.angsu Key Laboratory of Image Processing and Image Communication Nanjing University of Posts and TelecommunicationsNanjing 210003China

Aiming to solve the poor performance of low illumination enhancement algorithms on uneven illumination images,a low-light image enhancement(LIME)algorithm based on a residual network was *** algorithm constructs a deep network that uses residual modules to extract image feature information and semantic modules to extract image semantic information from different ***,a composite loss function was also designed for the process of low illumination image enhancement,which dynamically evaluated the loss of an enhanced image from three factors of color,structure,and *** ensures that the model can correctly enhance the image features according to the image semantics,so that the enhancement results are more in line with the human visual *** results show that compared with the state-of-the-art algorithms,the semantic-driven residual low-light network(SRLLN)can effectively improve the quality of low illumination images,and achieve better subj.ctive and obj.ctive evaluation indexes on different types of images.

关键词： image enhancement convolutional neural network(CNN) residual learning image semantics

Application of Angular Momentum Theory to Constructing Basis Functions of Irreducible Representations of Icosahedral Group

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Chemical Research in Chinese Universities 2004年第2期20卷 166-175页

作者： lian-yong SchoolofChemistryandChemicalEngineering SouthwesternNormalUniversityChongqing400715P.R.China

A new method based on angular momentum theory was proposed to construct the basis functions of the irreducible representations(IRs) of point groups. The transformation coefficients, i. e., coefficients S, are the components of the eigenvectors of some Hermitian matrices, and can be made as real numbers for all pure rotation point groups. The general formula for coefficient S was deduced, and applied to constructing the basis functions of single-valued irreducible representations of icosahedral group from the spherical harmonics with angular momentum j.7.

关键词： Irreducible representation Basis function I group Angular momentum