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Effects of particle type on the particle fluidization and distribution in a liquid–solid circulating fluidized bed boiler

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Chinese Journal of Chemical Engineering 2023年第2期54卷 53-66页

作者： Feng Jiang xiao li Guopeng Qi Xiulun li School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China School of Biological and Environmental Engineering Tianjin Vocational InstituteTianjin 300410China Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology Tianjin UniversityTianjin 300350China

A liquid-solid circulating fluidized bed boiler is designed and built for visualization research by applying the fluidized bed heat transfer and fouling prevention technology to the water side of the boiler. Four types of engineering plastic particles with different physical properties are selected as the solid working media. The effect of particle types on the fluidization and distribution of particles in the boiler is investigated under different feedwater flow rates and amount of added particles by using the charge couple device image measurement and acquisition system. The results show that all kinds of particles can't be normally fluidized and accumulate in the drum at low amount of added particles and feedwater flow rate. The particles with great density and low sphericity are more likely to accumulate. The average solid holdup in the riser tubes increases with the increase in feedwater flow rate and the amount of added particles. The non-uniform degree of particle distribution in the riser tubes generally decreases with the increase in feedwater flow rate and the amount of added particles. The particles with small density and settling velocity have high average solid holdup in the riser tubes under close sphericity. In generally,the smaller the density and settling velocity, the more uniform the particle distribution in the riser ***-dimensional diagrams of the non-uniform degree of particle distribution in the riser tubes of the boiler are established.

关键词： Circulating fluidized bed boiler Particle type Particle distribution Visualization Fouling prevention

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Comparison of BSA Release Behavior from Electrospun PLGA and PLGA/Chitosan Membranes

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Chemical Research in Chinese Universities 2011年第4期27卷 708-711页

作者： WU li-li li xiao-ran li Hua YUAN xiao-yan Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and Engineering Tianjin University Tianjin 300072 P.R. China

In order to encapsulate and controlled-release bioactive proteins,three fibrous membranes,i.e.,poly（L-lactide-co-glycolide）（PLGA）,hybrid PLGA and chitosan（H-PLGA/CS）,and core/shell PLGA/CS （C-PLGA/CS）,were produced by emulsion electrospinning,co-electrospinning and coaxial electrospinning,*** serum albumin（BSA） was selected as a model *** loading efficiency of BSA in the PLGA membrane was 1.56%,lower than those of H-PLGA/CS（5.98%） and C-PLGA/CS（4.80%）.BSA release profiles from the three membranes showed initial burst releases in the first 7 d and then sustained release for 28 *** releases at the end of the releasing period,28 d,from the above three membranes were nearly 63%,88% and 94%,respectively,indicating that the introduction of chitosan and the core/shell fiber structure could enhance BSA release *** addition,all these electrospun membranes could retain their fibrous morphologies after in vitro release of BSA for 28 d.

关键词： Controlled release Bovine serum albumin Electrospun membrane Poly(L-lactide-co-glycolide) Chitosan

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Development of Preparation Systems with K_2CsSb Photocathodes and Study on the Preparation Process

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Chinese Physics Letters 2019年第2期36卷 8-11页

作者： Fan Zhang xiao-Ping li xiao-Shen li Institute of High Energy Physics Chinese Academy of Sciences Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of Sciences

The next generation of advanced light sources requires photons with large average flux and high brightness,which needs advanced electron gun matched with excellent photocathode materials. K_2CsSb photocathode has the advantages of high quantum efficiency, long lifetime and instantaneous response. This study introduces the design of a set of K_2CsSb photocathode preparation systems and detailed preparation process of K_2CsSb photocathodes, including sequential deposition process and co-deposition process, and finally develops a K_2CsSb photocathode. The influence of laser power on the quantum efficiency is also investigated.

关键词： Cs Sb St Development of Preparation Systems with K2CsSb Photocathodes and Study on the Preparation Process

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dc Josephson Effect in s-Wave Superconductor/Ferromagnet Insulator/p-Wave Superconductor Junctions

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Communications in Theoretical Physics 2007年第4期47卷 737-740页

作者： li xiao-Wei Department of Physics and Electronics Huaiyin Teachers College Huaian 223001 China

The Josephson currents in s-wave superconductor/ferromagnet insulator/p-wave superconductor（s/FI/p） junctions are calculated as a function of temperature and the phase taking into account the roughness scattering effect at interface. The phase dependence of the Josephson current I （φ） between s-wave and px-wave superconductor is predicted to be sin（2φ）. The ferromagnet scattering effect, the barrier strength, and the roughness strength at interface suppress the dc currents in s/FI/p junction.

关键词： ferromagnet insulator p-wave superconductor dc Josephson current

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A Generalized MSST Algorithm for Counting Points of Elliptic Curves over F_(p)^(n)

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Journal of Systems Science & Complexity 2024年第4期37卷 1738-1754页

作者： li xiao LV Chang PAN Zhizhong Key Laboratory of Cyberspace Security Defense Institute of Information EngineeringChinese Academy of SciencesBeijing 100085China School of Cyber Security University of Chinese Academy of SciencesBeijing 100085China Huawei Technologies Co. Ltd.Shenzhen 518129China

Elliptic curve cryptography is an important part of nowaday's public key *** points of elliptic curves over finite fields is of great significance to the selection of safety *** present,there are many p-adic algorithms,such as SST algorithm,generalized AGM algorithm,Kedlaya algorithm,etc.,which can deal with the situation of finite fields of small *** this paper,the authors generalize the MSST algorithm of characteristic 2 to general fields of odd characteristic,and propose the generalized MSST *** generalized MSST algorithm is achieved by combining the advantages of the SST algorithm and the generalized AGM *** the time complexity of the multiplication of two n-bit numbers is denoted as O((n)^(μ)),then the time complexity of the generalized MSST algorithm is O(n^(2μ+1/1+μ)),which is the same as the improved SST *** practical experiments,the running time of the generalized MSST algorithm is less than that of the improved SST algorithm.

关键词： Elliptic curve generalized AGM algorithm generalized MSST algorithm SST algorithm

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Spectra of seismic force reduction factors of MDOF systems normalized by two characteristic periods

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Earthquake Engineering and Engineering Vibration 2020年第1期19卷 53-69页

作者： li xiao Tong Genshu Zhang Lei Department of Civil Engineering Zhejiang University

Seismic force reduction factor(SFRF) spectra of shear-type multi-degree-of-freedom(MDOF) structures are investigated. The modified Clough model, capable of considering the strength-degradation/hardening and stiffnessdegradation, is adopted. The SFRF mean spectra using 102 earthquake records on a typical site soil type(type C) are constructed with the period abscissa being divided into three period ranges to maintain the peak features at the two sitespecific characteristic periods. Based on a large number of results, it is found that the peak value of SFRF spectra may also exist for MDOF, induced by large high-mode contributions to elastic base shear, besides the mentioned two peak values. The variations of the stiffness ratio λk and the strength ratio λF of the top to bottom story are both considered. It is found that the SFRFs for λF ≤λk are smaller than those for λF > λk. A SFRF modification factor for MDOF systems is proposed with respect to SDOF. It is found that this factor is significantly affected by the story number and ductility. With a specific λF(= λk0.75), SFRF mean spectra are constructed and simple solutions are presented for MDOF systems. For frames satisfying the strong column/weak beam requirement, an approximate treatment in the MDOF shear-beam model is to assign a post-limit stiffness 15%-35% of the initial stiffness to the hysteretic curve. SFRF spectra for MDOF systems with 0.2 and 0.3 times the post-limit stiffness are remarkably larger than those without post-limit stiffness. Thus, the findings that frames with beam hinges have smaller ductility demand are explained through the large post-limit stiffness.

关键词： seismic force reduction factor multi-degree of freedom modifi ed Clough model characteristic period highmode eff ect post-limit stiff ness analysis

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Self-assembly of semiconductor nanoparticles toward emergent behaviors on fluorescence

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Nano Research 2021年第5期14卷 1233-1243页

作者： xiao li Zhili Lu Tie Wang Beijing National Laboratory for Molecular Sciences Key Laboratory of Analytical Chemistry for Living BiosystemsInstitute of ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Key Laboratory of Materials Processing and Mold Ministry of EducationZhengzhou UniversityZhengzhou450001China life and Health Research Institute School of Chemistry and Chemical EngineeringTianjin University of TechnologyTianjin300384China

Due to the unique fluorescence characteristics,superstructures from self-assembly of semiconductor nanoparticles have become essential components of material and chemical science,and thus it has broad application potential in displays,single-photon source,sensing,biological tagging and emerging quantum *** refers to an artificial functional architecture whose length scale is between the quantum scale and the *** solely treating this complicated stage fitted from less complicated pieces together(basic nanoparticles)and pile speculation on speculation,we must understand the fundamental questions,that is,what the hierarchy or specialization of function is at the *** uniqueness of this stage is not the collection of basic nanoparticles,but the behavior that emerges on fluorescence-basically a new type of *** the angle of view,this study reviews the advances in the fluorescence of individual semiconductor nanoparticles,inter-nanoparticles coupling and thus emergent fluorescence behaviors of *** also try to present the methodology for seeking emergent behaviors on fluorescence.

关键词： nanoparticle assembly optical properties ordered structures coupling emergent

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Electric-Field Switching of Exciton Spin Splitting in Asymmetrical Coupled Quantum Dots

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Chinese Physics Letters 2012年第8期29卷 202-204页

作者： li xiao-Jing College of Physics and Energy Fujian Normal UniversityFuzhou 350007

The spin splitting of the exciton states in semiconductor asymmetrical coupled quantum dots(CQDs)containing a single magnetic ion is theoretically *** is found that the spin splitting is not the largest when the electric field is *** electric field stronger than that in symmetrical CQDs is necessary to switch the splitting on/*** mixing between the bonding and antibonding hole states consequently results in the bright-to-dark transition of the ground exciton in the photoluminescence spectrum.

关键词： splitting bonding mixing

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Tunneling Conductance in Normal Metal/Insulator/Triplet Superconductor Junction

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Communications in Theoretical Physics 2005年第2X期44卷 381-384页

作者： li xiao-Wei Department of Physics Huaiyin Normal College Huaian 223001 China

Tunneling conductance in normal metal/insulator/triplet superconductor junctions is studied theoretically as a function of the bias voltage at zero temperature and finite temperature. The results show there are zero-bias conductance peak, zero-bias conductance dip and double-minimum structures in the spectra for p-wave superconductor junctions. The existence of such structures in the conductance spectrum can be taken as evidence that the pairing symmetry of Sr2RuO4 is p-wave symmetry.

关键词： triplet superconductor p-wave tunneling conductance

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Shot Noise in Ferromagnetic Superconductor Tunnel Junctions

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Communications in Theoretical Physics 2006年第2期45卷 369-372页

作者： li xiao-Wei Department of Physics Huaiyin Normal College Huaian 223001 China

In this paper, the superconducting order parameter and the energy spectrum of the Bogoliubov excitations are obtained from the Bogoliubov-de Gennes （BdG） equation for a ferromagnetic superconductor （FS）. Taking into account the rough interface scattering effect, we calculate the shot noise and the differential conductance of the normalmetal insulator ferromagnetic superconductor junction. It is shown that the exchange energy Eh in FS can lead to splitting of the differential shot noise peaks and the conductance peaks. The energy difference between the two splitting peaks is equal to 2Eh. The rough interface scattering strength results in descent of conductance peaks and the shot noise-to-current ratio but increases the shot noise.

关键词： ferromagnetic superconductor N/I/FS junction shot noise the rough interface scattering

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