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Reconstruction of nerve root sheaths for sacral extradural spinal meningeal cysts with spinal nerve root fibers

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Science China(Life Sciences) 2013年第11期56卷 1007-1013页

作者： SUN JianJun WANG ZhenYu LI ZhenDong wu HaiBo YEN RuYu ZHENG Mei CHANG qing LIU Isabelle Yisha Department of Neurosurgery Peking University Third Hospital Peking University Department of Neuroradiology Peking University Third Hospital Department of General Surgery Peking University Third Hospital Department of Neurology Peking University Third Hospital Department of Pathology Peking University Third Hospital Department of Head & Neck Surgery UCLA Medical CenterLos Angeles CA 90095 USA

This study analyzed the clinical characteristics and outcomes of sacral extradural spinal meningeal cysts with spinal nerve root fibers treated by reconstruction of the nerve root *** relationships between the cysts and spinal nerve root fibers were examined microscopically,the cysts were partially excised,and the defects were oversewn to reconstruct the nerve root *** Improved Japanese Orthopedic Association(IJOA)scoring system was used to evaluate preoperative and postoperative neurological ***-eight patients were included in this study,with a mean age of 41.4±15.57 *** mean IJOA score was 18.8±1.32 preoperatively and 19.6±0.65 postoperatively,which was a significant difference(t=–3.77,P=0.001).These results indicate a significant improvement in neurological function after *** most significant improvement in neurological function was sensation(z=–2.86,P=0.004),followed by bowel/bladder function(z=–2.31,P=0.02).

关键词： sacral canal spinal meningeal cysts reconstructed nerve root sheath spinal nerve root fibers clinical outcomes

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Sensor Calibration in Support for NOAA's Satellite Mission

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Advances in Atmospheric Sciences 2006年第1期23卷 80-90页

作者： Xiangqian wu Changyong CAO Sensor Physics Branch Satellite Meteorology and Climatology Division Ofice of Research and Applications National Environmental Satellite Data and Information Service National Oceanic and Atmospheric Administration 5200 Auth Road Camp Springs MD 20746 USA

Sensor calibration, including its definition, purpose, traceability options, methodology, complexity, and importance, is examined in this paper in the context of supporting NOAA＇s satellite mission. Common understanding of sensor calibration is essential for the effective communication among sensor vendors, calibration scientists, satellite operators, program managers, and remote sensing data users, who must cooperate to ensure that a nation＇s strategic investment in a sophisticated operational environmental satellite system serves the nation＇s interest and enhances the human lives around the world. Examples of calibration activities at NOAA/NESDIS/ORA are selected to further illustrate these concepts and to demonstrate the lessons learned from the past experience.

关键词： calibration sensors instruments satellites operations remote sensing

Invariance principles for the law of the iterated logarithm under G-framework

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Science China Mathematics 2015年第6期58卷 1251-1264页

作者： wu PanYu CHEN ZengJing Qilu Securities Institute for Financial Studies Shandong University School of Mathematics Shandong University

We obtain a general invariance principle of G-Brownian motion for the law of the iterated logarithm(LIL for short). For continuous bounded independent and identically distributed random variables in G-expectation space, we also give an invariance principle for LIL. In some sense, this result is an extension of the classical Strassen's invariance principle to the case where probability measure is no longer additive. Furthermore,we give some examples as applications.

关键词： iterated logarithm invariance expectation Brownian continuity union satisfy automatically details

Reflection of a moving shock wave over an oblique shock wave

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Chinese Journal of Aeronautics 2021年第5期34卷 399-403页

作者： Miaomiao WANG Ziniu wu Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China

The reflection of a moving shock wave over a wedge immersed in a still gas and the reflection of a wed ge induced steady shock wave over symmetrical and asymmetrical reflecting surfaces have received intensive considerations since more than 70 years *** we consider a different shock reflection problem—reflection of a moving shock wave over an initially steady oblique shock wave induced by a wedge immersed in supersonic *** the flow condition we considered,five moving triple points,with each connecting an incident shock wave,a reflected shock wave and a Mach stem,are *** using the reference frame co-moving with each triple point,the type of each shock wave of this triple point is *** present study is significant in that it treats a new shock reflection problem leading to a new shock reflection configuration and showing potential applications in supersonic flow with unsteady shock interaction.

关键词： Shock reflection Triple point Unsteady shock wave

APPLICATION OF STEP IN CAD/CAPP INTEGRATION

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Chinese Journal of Mechanical Engineering 1998年第2期11卷 10-16页

作者： wu, Ruirong Zhang, Heming qinghua Univ China

A brief discussion of the content and methodology of STEP is given, and STEP based strategies for CAD/CAPP information integration is pointed out. A STEP based feature technology in which a three layer feature definition is included is discussed, the content of feature information is analyzed and a stratified CAD feature library is shown. On these bases, a commonly shared part information model is proposed. The architecture of the integrated CAD/CAPP system is presented.

关键词： STEP CAD/CAPP Integration Feature

Effects of simulated acid rain on cation releasing in soils of South China

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Journal of Environmental Sciences 1998年第3期10卷 54-60页

作者：  wu qing, Qiu Rong liang, Lu Yue naDepartment of Environmental Science,Zhongshan University,Guangzhou 510275,China

This paper deals with the release of base cations and Al^3+ at the treatment with simulated acid rain (SAR) in main soil types collected from South China. Results showed that the amounts of base cations increased obviously when the pH value of simulated acid rain was lower than 30 or 35. Compared with the leaching of K^+ and Na^+, the leaching of Ca^2+ and Mg^2+ was affected by the pH value of SAR. Only when the amounts of base cations leached from soils exceeded the cation exchange capacity, the pH value of leaching solutions decreased sharply and the amounts of released Al^3+ increased. The H^+ buffering mechanisms, which were affected not only by the pH values of SAR, but also by the types and solid components of soils, were proposed for the main soils studied.

关键词： acid deposition base cations aluminum leaching.

DFT study of solvation of Li+/Na+ in fluoroethylene carbonate/vinylene carbonate/ethylene sulfite solvents for lithium/sodium-based battery

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Chinese Physics B 2021年第3期30卷 519-528页

作者： Qi Liu Guoqiang Tan Feng wu Daobin Mu Borong wu Beijing Key Laboratory of Environment Science and Engineering School of Material Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

Choosing suitable solvent is the key technology for the electrochemical performance of energy storage *** them,vinylene carbonate(VC),fluoroethylene carbonate(FEC),and ethylene sulfite(ES)are the potential organic electrolyte solvents for lithium/sodium ***,the quantitative relation and the specific mechanism of these solvents are currently *** this work,density functional theory(DFT)method is employed to study the lithium/sodium ion solvation in solvents of VC,ES,and *** first find that 4VC-Li+,4VC-Na+,4ES-Li+,4ES-Na+,4FEC-Li+,and 4FEC-Na+are the maximum thermodynamic stable solvation ***,it is indicated that the innermost solvation shells are consisted of 5VC-Li+/Na+,5ES-Li+/Na+,and 5FEC-Li+/Na+.It is also indicated that the Li+solvation complexes are more stable than Na+***,infrared and Raman spectrum analysis indicates that the stretching vibration of O=C peak evidently shifts to high frequency with the Li+/Na+concentration reducing in nVC-Li+/Na+and nFEC-Li+/Na+solvation complexes,and the O=C vibration peak frequency in Na+solvation complexes is higher than that of Li+*** S=O stretching vibration in nES-Li+/Na+solvation complexes moves to high frequency with the decrease of the Li+/Na+concentration,the S=O vibration in nES-Na+is higher than that in nES-Li+.The study is meaningful for the design of new-type Li/Na battery electrolytes.

关键词： elelctrolyte solvation lithium ion battery sodium ion battery

Extension of Floquet's theory to nonlinear quasiperiodic differential equations

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Science China Mathematics 2005年第12期48卷 1670-1682页

作者： wu Hao LI Weigu School of Mathematical Sciences Peking UniversityBeijing 100871China School of Mathematical SciencesPeking UniversityBeijing 100871China

In this paper, we consider the following autonomous system of differential equations: x = Ax + f(x,θ), θ = ω, where θ∈Rm, ω = (ω1,…,ωm) ∈ Rm, x ∈ Rn, A ∈ Rn×n is a constant matrix and is hyperbolic, f is a C∞ function in both variables and 2π-periodic in each component of the vector e which satisfies f = O(||x||2) as x → 0. We study the normal form of this system and prove that under some proper conditions this system can be transformed to an autonomous system: x = Ax + g(x), θ = ω. Additionally, the proof of this paper naturally implies the extension of Chen's theory in the quasi-periodic case.

关键词： quasiperiodic system,normal form.

Cyan-green-emitting Ca_(3)Sc_(2)Si_(3)O_(12):Ce^(3+)transparent ceramics:A promising color converter for high-brightness laser lighting

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Journal of Advanced Ceramics 2023年第9期12卷 1731-1741页

作者： Huajun wu Hao wu Guo-Hui Pan Liangliang Zhang Zhendong Hao Jiahua Zhang State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Transparent phosphor ceramics have received increasing attention for high-brightness laser lighting,but commercially available phosphor ceramics are currently mainly limited to yellow YAG:Ce and green LuAG:Ce garnets,leaving a“cyan cavity”which is an obstacle to realizing full-color *** new phosphor ceramics capable of filling the cavity is a ***,for the first time,cyan-green-emitting Ca_(3)Sc_(2)Si_(3)O_(12):Ce^(3+)(CSS:Ce)transparent ceramics have been successfully developed by two-step sintering technique under *** as-prepared CSS:Ce ceramics present high relative density of 99.7%and optical transmittance of 71%in the cyan-green spectral *** exhibits an efficient band emission peaking at 504 nm(under 450 nm excitation)with internal/external quantum efficiency of 91%/62%.Furthermore,it has excellent thermal stability with a thermal quenching temperature(T_(0.5))of 838 K,approximately 100 K higher than that of LuAG:Ce ceramics(738 K).In addition,the CSS:Ce ceramics can withstand blue laser density of 45.6 W/mm^(2)and meanwhile generates cyan-green light with a forward luminous flux of 813 lm and forward luminous efficacy of 162 lm/*** CSS:Ce transparent ceramics exhibit excellent luminescence performance comparable to the commercial LuAG:Ce ceramics and could be a highly promising color converter for high-brightness laser lighting.

关键词： transparent ceramics color converter laser lighting garnet Ca_(3)Sc_(2)Si_(3)O_(12)(CSS)