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The least square particle finite element method for simulating large amplitude sloshing flows

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Acta Mechanica Sinica 2008年第3期24卷 317-323页

作者： bo tang Junfeng Li Tianshu Wang School of Aerospace Tsinghua University Beijing 100084 China

Large amplitude sloshing in tanks is simulated by the least square particle finite element method （LSPFEM） in this paper. The least square finite element method （LSFEM） is employed to spatially discrete the Navier-Stokes equations, and to avoid the stabilization issues due to the incompressibility condition for equal-order interpolation of the velocity and the pressure, as usually used in Galerkin method to satisfy the well-known LBB condition. The LSPFEM also uses the Lagrangian description to model the motion of nodes （particles）. A mesh which connects these nodes is constructed by a triangulation algorithm to avoid the mesh distortion. A quasi a-shapes algorithm is used to identify the free surface boundary. The nodes are viewed as particles which can freely move and even separate from the main fluid domain. Finally this method is used to study the large amplitude sloshing evolution in two dimensional tanks. The results are compared with those obtained by Flow-3d with good agreement.

关键词： Incompressible fluid Least square finiteelement method Lagrangian description boundaryrecognition Collapse Impact

Research on momentum transfer in simple railgun

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Defence Technology（防务技术） 2019年第5期15卷 735-740页

作者： Yingtao Xu bo tang Baoming Li The National Key Laboratory of Transient Physics Nanjing University of Science and Technology

In this paper,the momentum conservation equation in the longitudinal direction for simple railgun was ***,a three-dimensional model was established and the finite element method was utilized to simulate the *** on the simulation,some results such as the surface force on the electromagnetic field,the electromagnetic force on the conductor in the longitudinal direction were ***,the surface force density on different longitudinal section of railgun was analyzed and discussed in *** results showed that the momentum of the railgun system was conserved when the surface force of the electromagnetic field was ***,large amount of longitudinal force was transmitted to the breech by the electromagnetic field in the form of surface *** exact position and distribution of recoil were related to the current input device.

关键词： Railgun Momentum conservation Recoil Surface force

Aeroelastic scaling laws for gust load alleviation control system

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Chinese Journal of Aeronautics 2016年第1期29卷 76-90页

作者： tang bo Wu Zhigang Yang Chao School of Aeronautic Science and Engineering Beihang University

Gust load alleviation （GLA） tests are widely conducted to study the effectiveness of the control laws and methods. The physical parameters of models in these tests are aeroelastic scaled, while the scaling of GLA control system is always unreached. This paper concentrates on studying the scaling laws of GLA control system. Through theoretical demonstration, the scaling criterion of a classical PID control system has been come up and a scaling methodology is provided and veri- fied. By adopting the scaling laws in this paper, gust response of the scaled model could be directly related to the full-scale aircraft theoretically under both open-loop and closed-loop conditions. Also, the influences of different scaling choices of an important non-dimensional parameter, the Froude number, have been studied in this paper. Furthermore for practical application, a compen- sating method is given when the theoretical scaled actuators or sensors cannot be obtained. Also, the scaling laws of some non-linear elements in control system such as the rate and amplitude sat- urations in actuator have been studied and examined by a numerical simulation.

关键词： Actuator Aeroelasticity Control Systems Froude number Gust loads alleviation Scaling laws

Advanced delivery strategies facilitating oral absorption of heparins

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Asian Journal of Pharmaceutical Sciences 2020年第4期15卷 449-460页

作者： Guihua Fang bo tang School of Pharmacy Nantong University19 Qixiu RoadNantong 226001China

Heparins show great anticoagulant effect with few side effects,and are administered by subcutaneous or intravenous route in *** improve patient compliance,oral administration is an alternative ***,oral administration of heparins still faces enormous challenges due to the multiple *** review briefly analyzes a series of barriers ranging from poorly physicochemical properties of heparins,to harsh biological barriers including gastrointestinal degradation and pre-systemic ***,several approaches have been developed to overcome these obstacles,such as improving stability of heparins in the gastrointestinal tract,enhancing the intestinal epithelia permeability and facilitating lymphatic delivery of ***,this review aims to provide insights concerning advanced delivery strategies facilitating oral absorption of heparins.

关键词： Heparins Oral delivery Multiple obstacles Stability Intestinal epithelia permeability Lymphatic transport

Reductive smelting of spent lead–acid battery colloid sludge in a molten Na_2CO_3 salt

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International Journal of Minerals,Metallurgy and Materials 2015年第8期22卷 798-803页

作者： Yu-jie Hu Chao-bo tang Mo-tang tang Yong-ming Chen School of Metallurgy and Environment Central South University School of Metallurgy Engineering Hunan University of Technology

Lead extraction from spent lead–acid battery paste in a molten Na2CO3 salt containing Zn O as a sulfur-fixing agent was studied. Some influencing factors, including smelting temperature, reaction time, Zn O and salt dosages, were investigated in detail using single-factor experiments. The optimum conditions were determined as follows: T = 880°C; t = 60 min; Na2CO3/paste mass ratio = 2.8:1; and the Zn O dosage is equal to the stoichiometric requirement. Under the optimum conditions, the direct recovery rate of lead reached 98.14%. The results suggested that increases in temperature and salt dosage improved the direct recovery rate of lead. XRD results and thermodynamic calculations indicated that the reaction approaches of lead and sulfur were Pb SO4→Pb and Pb SO4→Zn S, respectively. Sulfur was fixed in the form of Zn S, whereas the molten salt did not react with other components, serving only as a reaction medium.

关键词： lead–acid batteries molten salts lead smelting des

Target models and waveform design for detection in MIMO radar

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Science China(Information Sciences) 2014年第1期57卷 268-279页

作者： tang Jun LUO Jun tang bo DU JinSong Electronic Engineering Department of Tsinghua University China Marine Development & Research Center Shenyang Institute of Automation Chinese Academy of Sciences

In this paper,we propose a general target model for multiple-input multiple-output(MIMO)*** types of targets are *** each type of target,we develop a corresponding optimum waveform designing method to optimize detection *** on Chernof-Stein lemma,we use relative entropy as the performance *** show that the optimum waveform designing method can obtain better detection performance than traditional orthogonal waveform designing method.

关键词： MIMO radar waveform designing relative entropy

A combinatorial synthesis method for identification of orally bioavailable cyclic peptide

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Science China Chemistry 2024年第8期67卷 2429-2430页

作者： Zhenzhen Liu Li Liu bo tang College of Chemistry Chemical Engineering and Materials ScienceKey Laboratory of Molecular and Nano ProbesMinistry of EducationCollaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of ShandongInstitutes of Biomedical SciencesShandong Normal UniversityJinan 250014China Laoshan Laboratory Qingdao 266237China

Cyclic peptides are a type of polypeptide with macrocyclic structure formed by canonical and non-canonical amino *** to their rigid conformation and large surface area,cyclic peptides typically exhibit high binding affinity and specificity with target proteins,particularly those considered undruggable by traditional small molecule drugs,such as protein-protein interactions[1].Additionally,they are convenient to be chemical modified to improve the pharmacological or pharmacokinetic properties.

关键词： properties. canonical synthesis

The unique spontaneous polarization property and application of ferroelectric materials in photocatalysis

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Nano Research 2024年第5期17卷 3571-3585页

作者： Jinghua An Chang Xu Lu Li bo tang College of Chemistry Chemical Engineering and Materials ScienceKey Laboratory of Molecular and Nano ProbesMinistry of EducationCollaborative Innovation Center of Functionalized Probes for Chemical Imaging in University of ShandongInstitute of Molecular and Nano ScienceShandong Normal UniversityJinan 250014China Laoshan Laboratory 168 Wenhai Middle RdAoshanwei JimoQingdao 266237China

The unique spontaneous polarization property of ferroelectric material makes it to be a special catalyst in *** spontaneous polarization property can induce the formation of built-in electric field,which can improve the separation of photoelectrons and holes to affect photocatalytic *** internal electric field induced by spontaneous polarization can be influenced by multiple factors such as the morphology,the concentration of defect,the type of doped heteroatoms,as well as the composition of ***,the preparation method,pretreating temperature,the strength of prepolarized external electric field of ferroelectric-based photocatalysts as well as the strength of external mechanical force or external magnetic field in photocatalytic reactions can influence the photocatalytic effectivity via influencing spontaneous polarization-induced internal electric ***,it is urgently to unveil the mystery of structure-activity relationships for ferroelectric materials-based photocatalysts,which is usually *** this in mind,this review was provided for the role of various complex influencing factors on ferroelectric materials-based photocatalysis based on the latest advancement in the fields of new energy development,environmental *** the beginning,the basic structure and properties of ferroelectric material are ***,popular synthesis methods of ferroelectric-based photocatalysts are *** that,two main mechanisms of ferroelectric photocatalysis are *** research progress of ferroelectric photocatalysis is then given emphatically according to the classification of photocatalytic ***,the problems existing nowadays and the challenges facing in the future on the application of ferroelectric materials-based photocatalysts are outlined in the summary and outlook section.

关键词： spontaneous polarization photocatalysis ferroelectric separation of electrons and holes

Highly Sensitive Spectrofluorimetric Determination of Trace Amounts of Indium(Ⅲ) with Salicylaldehyde Salicyloylhydrazone

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Chemical Research in Chinese Universities 2002年第2期18卷 183-188页

作者： HAN Fang WANG Hong jian tang bo Department of Chemistry Shandong Normal UniversityJinan 250014P.R.China

The fluorescent reaction of salicylaldehyde salicyloylhydrazone(SASH) with indium(Ⅲ) was studied in detail. Based on this chelation reaction, a sensitive spectrofluorimetric method was developed for the determination of indium in a water ethanol(volume ratio 3∶7) medium at pH 4 0. Under the condition, the In SASH complex displays an excitation and emission maxima at 396 and 461 nm, respectively. The linear range of the method is from 4 7 to 1000 ng/mL and the detection limit is 0 94 ng/mL. The molar ratio of indium to the reagent is 1∶1. The interferences of other ions were studied. The method was successfully applied to the determination of indium in the chemical reagents of lead, tin, zinc, zinc chloride and geological samples by standard addition method.

关键词： Indium determination Salicylaldehyde salicyloylhydrazone Spectrofluorimetry