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Frontiers of Chemical Science and Engineering 2008年第1期2卷 80-84页

作者： Shihao GAO Changquan GAO Chenghui SUN Xinqi ZHAO School of Material Science and Technology Beijing Institute of TechnologyBeijing 100081China Pingdingshan no.55 Middle School Pingdingshan 467091China

2-(5-Amino-1,2,4-thiadiazol-3-yl)-2-(Z)-meth-oxyiminoacetic acid 2-benzothiazolyl thioester(III),an important intermediate of the fourth generation cephalos-porins,was efficiently synthesized by reacting 2-(5-amino-1,2,4-thiadiazol-3-yl)-2-(Z)-methoxyiminoacetic acid(I)with 2,29-dibenzothiazole disulfide(II)in the presence of *** of reaction time,temperature,solvents,catalysts and feeding molar ratio on the yield and quality of products were investigated,and an im-proved procedure suitable for industrial production was *** 1,2-dichloroethane as solvent,triphe-nylphosphine as reducer,and triethylamine as catalyst,n(I):n(II):n(triphenylphosphine)51.0:1.0:1.0,the product was obtained at room temperature in 98.1%*** purity of the product without further purification is 98.7%determined by HPLC *** procedure could be a suitable alternative to the traditional processes because of its easy handling,high yield and low cost.

关键词： pharmaceutical engineering 2-(5-amino-1 2 4-thiadiazol-3-yl)-2-(Z)-methoxyiminoacetic acid 2-benzothiazolyl thioester cephalosporin thioesterification

The rotation of polarization of a terahertz wave through subwavelength metallic structures

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Science China(Physics,Mechanics & Astronomy) 2013年第3期Mechanics & Astronomy) .卷 514-518页

作者： LIU JianFeng ZHOU QingLi SHI YuLei ZHANG CunLin Beijing Key Laboratory for Terahertz Spectroscopy and Imaging Key Laboratory of Terahertz OptoelectronicsMinistry of EducationDepartment of PhysicsCapital Normal University Beijing no.55 Middle School

Structures consisting of a planar array of subwavelength metallic bars fabricated on a dielectric substrate are theoretically investigated in order to rotate the polarization of a normally incident terahertz wave in the resonance frequency *** attribute this phenomenon to one component of the terahertz electric field parallel to inclined metallic bars which is reflected strongly due to the terahertz re-radiation from accelerated electrons in the metallic bars,while the other component perpendicular to the bars transmits almost entirely through the *** theoretical analysis,we obtain the transmitted-terahertz components polarized in the x-and y-directions,*** studies indicate polarization of a terahertz wave can be rotated within two specific frequency bands when the terahertz impinges on the double-bar sample.

关键词： terahertz metamaterial polarization

THE QUADRATIC SPECHT TRIANGLE

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Journal of Computational Mathematics 2020年第1期38卷 103-124页

作者： Hongliang Li Pingbing Ming Zhongci Shi Department of Mathematics Sichuan Normal UniversityChengdu 610066China The State Key Laboratory of Scientific and Engineering Computing Academy of Mathematics and Systems ScienceChinese Academy of SciencesNo.55East Road ZhongGuanCunBeijing 100190China

We propose a class of 12 degrees of freedom triangular plate bending elements with quadratic rate of *** may be viewed as the second order Specht triangle,while the Specht triangle is one of the best first order plate bending *** convergence result is proved under minimal smoothness assumption on the *** results for both the smooth solution and nonsmmoth solution confirm the theoretical prediction.

关键词： Specht triangle Plate bending element Basis functions

Research on Maintenance Information Management System for Distributed Manufacture System

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Journal of Beijing Institute of Technology 2004年第2期13卷 194-196页

作者：张之敬戴琳陶俐言周娟 School of Mechanical and Vehicular Engineering Beijing Institute of Technology Beijing100081 China no.55 Research Institute of China North Industries Group Corporation Changchun Jilin130001 China

An architecture and design of a maintenance information management system for distributed manufacture system is presented in this paper, and its related key technologies are studied and implemented also. A frame of the maintenance information management system oriented human-machine monitoring is designed, and using object-oriented method, a general maintenance information management system based on SQL server engineering database and adopted client/server/database three-layer mode can be established. Then, discussions on control technologies of maintenance information management system and remote distributed diagnostics and maintenance system are emphasized. The system is not only able to identify and diagnose faults of distributed manufacture system quickly, improve system stability, but also has intelligent maintenance functions.

关键词： distributed manufacture system maintenance information management system intelligent maintenance

3D direct writing and micro detonation of CL-20 based explosive ink containing O/W emulsion binder

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Defence Technology（防务技术） 2022年第8期18卷 1340-1348页

作者： Zhan-xiong Xie Chong-wei An Bao-yun Ye Jia-qing Mu Chun-yan Li Min-jie Li Song-jin Liu School of Environment and Safety Engineering North University of ChinaTaiyuanShanxi030051China Shanxi Engineering Technology Research Center for Ultrafine Powder North University of China030051TaiyuanChina no.55 Research Institute of China North Industries Group CorporationChangchun130012China

The booming development of DIW technology present an unprecedented prospect in energetic materials field and has attracted great interest due to its relative simplicity and high flexibility of ***,a novel CL-20 based explosive ink formulation have been developed successfully for MEMS initiation systems via DIW *** designed PVA/GAP into an oil-in-water(O/W)emulsion,in the way that the aqueous solution of PVA as water phase,the ethyl acetate solution of GAP as oil phase,the combination of Tween 80 and SDS as emulsifier,BPS as a curing agent of *** ideal formulation with good shear-thinning rheology properties and clear gel point was prepared using only 10 wt%*** dual-cured network formed during the curing process made the printed sample have good mechanical *** printed samples had satisfactory molding effect without cracks or fractures,the crystal form of CL-20 not changed and the thermal stability have *** of explosive inks via DIW in micro-scale grooves had excellent detonation performances,which critical detonation size was 1×0.045 mm,detonation velocity was 7129 m/s and when the corner reaching 150°can still detonated *** study may open new avenues for developing binder systems in explosive ink formulations.

关键词： Direct writing Explosive ink Emulsion binder system CL-20 based energetic composites Micron detonation

On the Effect of Ghost Force in the Quasicontinuum Method:Dynamic Problems in One Dimension

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Communications in Computational Physics 2014年第3期15卷 647-676页

作者： Xiantao Li Pingbing Ming Department of Mathematics the Pennsylvania State UniversityUniversity ParkPennsylvania16802USA LSEC Institute of Computational Mathematics and Scientific/Engineering ComputingAMSSChinese Academy of SciencesNo.55East Road Zhong-Guan-CunBeijing100190P.R.China

Numerical error caused by“ghost forces”in a quasicontinuum method is studied in the context of dynamic *** error in the discrete W^(1,∞)norm is analyzed for the time scale O(ε)and the time scale O(1)withεbeing th... 详细信息

关键词： Quasicontinuum methods ghost force dynamic problems

Nano Calcium-Deficient Hydroxyapatite/O-carboxymethyl Chitosan-CaCl_(2) Microspheres Loadedwith RheinforBone Defect Repair

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Journal of Bionic Engineering 2022年第4期19卷 1087-1099页

作者： Zhenzhen Tian Yuanyuan Guo Xiuying Yang Kebing Guo Jingou Ji Shilei Hao School of Chemistry and Chemical Engineering Chongqing UniversityNo.55University City South RoadShapingba DistrictChongqing 401331China Key Laboratory of Biorheological Science and Technology Ministry of EducationCollege of BioengineeringChongqing UniversityChongqing 400030China Guizhou KingMed Center for Clinical Laboratory Co. LtdGuizhou 550001China

Glutaraldehyde(GA),the most widely used crosslinking agent for biomaterials,is ***_(2) is of particular interest due to its non-toxic *** can chelate Ca^(2+)and promote bone *** we reported a novel nano calcium-deficient hydroxyapatite/O-carboxymethyl chitosan-CaCl_(2) microspheres loaded with rhein(RH-nCDHA/OCMC-CaCl_(2) microspheres)using CaCl_(2) as crosslinking agent for bone defect *** obtained microspheres were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),thermogravimetric analysis(TG)and Fourier transform infrared spectroscopy(FT-IR).The surface of the obtained microspheres is rough with quite a few *** nano calcium-deficient hydroxyapatite(nCDHA)accounts for about 70% of the total weight of the microspheres,which is equivalent to the proportion of inorganic substances in human bones.A high encapsulation efficiency(EE)and loading capacity(LC)of the microspheres loaded with rhein was 90.20±0.60% and 11.03±0.30%,*** microspheres using CaCl_(2) in simulated body fluid(SBF)after 14 days,the drug released continuously and bone-like apatite formed like *** cells on the surface of the RH-nCDHA/OCMC-CaCl_(2) microspheres grew better comparing with nCDHA/OCMC-GA microspheres and the skull defects of rats after landfill can be almost repaired after 8 weeks,which revealed the potential of the microspheres for bone repair.

关键词： Nano calcium-deficient hydroxyapatite O-carboxymethyl chitosan Rhein Microspheres Bone repair

A Family of Nonconforming Rectangular Elements for Strain Gradient Elasticity

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Advances in Applied Mathematics and Mechanics 2019年第6期11卷 1263-1286页

作者： Yulei Liao Pingbing Ming School of Mathematics Renmin University of ChinaNo.59Zhongguancun StreetBeijing 100872China LSEC Institute of Computational MathematicsAMSS Chinese Academy of SciencesNo.55East Road ZhongguancunBeijing 100190Chinaand School of Mathematical SciencesUniversity of Chinese Academy of SciencesBeijing 100049China

We propose a family of nonconforming rectangular elements for the linear strain gradient elastic *** error estimates uniformly with respect to the small material parameter have been *** results confirm the theoretical... 详细信息

关键词： Nonconforming finite elements strain gradient elasticity uniform error estimate

Integrating morphological spatial pattern analysis and the minimal cumulative resistance model to optimize urban ecological networks: a case study in Shenzhen City, China

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Ecological Processes 2021年第1期10卷 862-876页

作者： Yang‑Yang Li Yu‑Zhe Zhang Zhi‑Yun Jiang Cheng‑Xuan Guo Ming‑Yue Zhao Zhi‑Guang Yang Ming‑Yan Guo Bing‑Yue Wu Quan‑Ling Chen School of Geography South China Normal UniversityNo.55West of Zhong‑shan AvenueTianhe DistrictGuangzhou 510631China. Institute of Environ‑ment and Sustainable Development in Agriculture Chinese Academy of Agri‑cultural SciencesBeijing 100081China. School of Natural Resources Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China

Background:With the increasing fragmentation of landscape induced by rapid urbanization,the construction of ecological networks is of great signifcance to alleviate the degradation of urban habitats and protect natural envi‑***,there is considerable uncertainty when constructing ecological networks,especially the difer‑ent approaches to selecting ecological *** used the southern Chinese city of Shenzhen as a study area to construct and optimize ecological networks using a coupling *** source areas were extracted using morphological spatial pattern analysis(MSPA)and the landscape index *** networks were con‑structed using the minimal cumulative resistance(MCR)model and the gravity *** stones and ecological fault points were added in corridors to optimize the ecological ***:Ten core areas with maximum importance patch values were extracted by the landscape index method as ecological source areas according to MSPA,after which corridors between ecological sources were constructed based on the MCR *** constructed ecological networks were optimized using 35 stepping stones and 17 ecologi‑cal fault *** optimized ecological networks included 11 important corridors,34 general corridors,and seven potential *** results of corridor landscape-type analysis showed that a suitable ecological corridor is 60 to 200 m ***:Overall,our results imply that ecological source areas can be identifed virtually,and that ecological networks can be signifcantly optimized by combining MSPA and MCR *** results provide a methodologi‑cal reference for constructing ecological networks,and they will be useful for urban planning and biodiversity protec‑tion in Shenzhen and other similar regions around the world.

关键词： MSPA analysis MCR model Ecological corridor Ecological resistance surface Shenzhen City

THEORETICAL MODELING AND EXPERIMENTAL TESTING FOR SAW TORQUE SENSING

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THEORETICAL MODELING AND EXPERIMENTAL TESTING FOR SAW TORQUE...