保持算子乘积投影的线性映射

设B(H)是复Hilbert空间H上的有界线性算子全体且dim H≥2.本文证明了B(H)上的线性满射φ保持两个算子乘积非零投影性的充分必要条件是存在B(H)中的酉算子U以及复常数λ满足λ~2=1,使得φ(X)=λU~*XU,(?)X∈B(H).同时也得到了线性映射保持两个算子Jordan三乘积非零投影的充分必要条件.     

因子Von Neumann代数中套子代数上的局部3-上循环

证明了因子von Neumann代数中的套子代数到其单位对偶双模内的每个弱连续的局部3-上循环都是3-上循环.     

一类反应扩散方程非负平衡解的存在性

本文利用锥映象不动点指数计算方法,结合极值原理、上下解方法以及算子的谱分析,得出了一类反应扩散方程非负平衡解的存在性。     

Thermal Decomposition Behavior and Non-isothermal Decom-position Reaction of Copper(II) Salt of 4-Hydroxy-3,5-dinitro- pyridine Oxide and Its Application in Solid Rocket Propellant

Introduction Copper(II) salt of 4-hydroxy-3,5-dinitropyridine ox-ide (4HDNPOCu) is an energetic material containing energetic groups of NO2, which can be used as an ener-getic auxiliary catalyst substituting the inertia copper salt to improve the catalysis of the main catalyst (lead salt) in Composite Modified Double Base propellant containing RDX (RDX-CMDB propellant).1 Thermal behavior is one of the most important aspects affecting its catalytic efficiency for propellant. However, …     

疲劳裂纹闭合研究的进展

本文阐述了疲劳裂纹闭合的四种诱发机制,介绍了疲劳裂纹闭合现象测量的几种方法并结合作者的工作进行了评述.文中详细地介绍和探讨了材料、应力比、试样几何尺寸、环境及载荷谱等因素对裂纹闭合现象的影响,指出了目前研究工作中存在的问题.并对今后开展研究工作的方向提出了看法.     

ZrO_2的掺杂对于单畴YBCO超导块材的影响

研究了在Y211中掺入ZrO2对于用顶部籽晶熔渗方法制备YBCO块材的影响,以及不同掺杂比例对于样品表面形貌和磁悬浮力的影响.实验表明,随着ZrO2掺杂量的增加,样品的磁悬浮力有增大的趋势.这种现象可能是由于ZrO2的掺杂在样品中形成了磁通钉扎中心,有效的提高了超导体的物理性能.     

软X射线皮秒变象管扫描相机

软X射线皮秒变象管扫描相机技术是一种用变象管扫描相机测量X射线脉冲而能达到皮秒时间分辨率和一维微米级空间分辨率的技术。X射线扫描相机是研究伴有X射线辐射的一切高速瞬变过程的极为重要的测量工具。例如在激光核聚变的研究中,加热压缩期间靶球发生内爆过程中高温高密度等离子体的光谱辐射主要为软X射线,对这些软X射线的研究,可以获得有关等离子体的电子温度、电子能量分布、各种不稳定性的形态及这些参量随时间变化的资料。     

Kinetics and Mechanism of the Thermal Decomposition Reaction of 3,3-Bis（azidomethyl）oxetane／Tetrahydrofuran Copolymer

Introduction 3,3-Bis(azidomethyl)oxetane/tetrahydrofuran (BAM- O/THF, marked as B/T) copolymer can be used as an azide binder of high energy propellants with the lower signature, and lower sensitivity to improve the me-chanical properties at lower temperature and the burning rate characteristics. Its decomposition kinetics and the effects of THF on the decomposition kinetics of BAMO copolymers have been reported.1,2 In the present work, we report the kinetic model function and kinetic pa…     

Characters of the Plateau of Methanol Increment in Frontal Analysis in Reversed Phase Liquid Chromatography

With insulin methanol-water,and the ion-pairing agent,hydrochloric acid and trifluroacetic acid(TEA),the character of the first plateau(FP)on the elution curve of frontal analysis in reversed phase liquid chromatography(RPLC)was investigated by on-line UV-spectrometry and identified with nuclear magnetic resonance(NMR) spectrometry and mass spectrometry.The profile of the FP is the same as that of a usual elution curve of methanol in frontal analysis(FA).When the insulin concentration was limited to a certain range,the height of the FP was found to be proportional to the insulin concentration in mobile phase and its length companying to shorten,The FP profile on the intersection of two tangents reflects the components of the microstructure in the depth direction of the bonded stationary phase layer and the desorption dynamics of the displaced components.The displaced methanol was quantitatively determined by NMR and on-line UV spectrometries.TFA with high UV absorbance can not be used as an ionpairing agent for the investigation of the FP in RPLC,but if can be used as a good marker to investigate the complicated transfer process of components in the stationary phase in RPLC.A stoichiometric displacement process between solute and solvent was proved to be valid in both usual and FA in RPLC.From the point of view of dynamics of mass transfer, the solutes can only contact to the surface of stationary phase in usual RPLC,while solute can penetrate into it in FA of RPLC.The solvation of insulin in methanol and water solution as an example indicating the usage of the FP in the FA was also investigated in this paper.     

Non-isothermal Kinetics of the Thermal Decomposition of 3-Nitro-1,2,4-triazol-5-one Magnesium Complex

Introduction3 Nitro 1,2 ,4 triazol 5 one (NTO)metalcomplexeshavemanyspecialstructuresandsomepotentialusesinammunition .1 4 Wepreviouslypreparedanddeterminedthecrystalstructureofitsmagnesiumcomplex ,5andinthispaper ,wediscusseditsthermalbehaviorbyDSCandTG/DTGtechniquesandstudieditsnon isothermalkineticsbythemeansoftheKissingermethod ,theOzawamethod ,thedifferentialmethodandtheintegralmethod .ExperimentalSample[Mg(H2 O) 6 ](NTO) 2 ·2H2 Owaspreparedasfollows :AcalculatedamountofMg(OH…