基于强度传输方程的相位检索

为了从直接测量的强度图像中计算出相位信息,研究了基于强度传输方程的相位检索技术.设计了一个实用的相位检索系统,包含经典傅里叶相位检索和基于整体变分的相位检索算法.通过测量聚焦平面和前后散焦平面光波场的空间强度,求解二阶微分方程得到相位.与迭代相位检索技术相比克服了其迭代不确定性、收敛速度慢等缺点.实验表明,利用强度传输方程检索相位的方法可以有效快速地从强度图像中计算出相位|整体变分算法相比傅里叶算法,在恢复相位的同时可以保持良好的边缘.     

Rapid atto‐molar level detection of surface‐enhanced Raman spectroscopy technique based on glycidyl methacrylate–ethylene dimethacrylate (GMA–EDMA) porous material

A novel miniature device for rapid ultra‐sensitive surface‐enhanced Raman scattering (SERS) detection was developed in the present study. The device was made of a syringe, a piece of filter, and a Teflon tube. Therefore, it was with advantages of simplicity, miniaturization, and easy operability. The tube was filled in advance with the glycidyl methacrylate‐ethylene dimethacrylate powder porous material which has been proved to increase the sensitivity of normal SERS dramatically, then the mixture solution containing the analyte, silver colloid, and NaCl solution passed through the porous material by the action of the syringe. SERS signals were collected from the surface of the material. Rhodamine 6G (R6G), p‐aminothiophenol (PATP), and thiabendazole (TBZ) were employed as the probe molecules in the present work. R6G at microlitre‐scale can be detected at an extremely low concentration of 10^–18 mol/l, and the relative standard deviation of spot to spot is 14.16% at the intensity of the band at 609 cm⁻¹. The concentrations of PATP and TBZ that can be detected with the method are 10⁻¹¹ mol/l and 1.3 × 10⁻⁶ mol/l, respectively. This method not only has achieved the ultra‐sensitive detection of dye and pesticide but also realized the simple, rapid, and small sample quantity requirement detection, and it is of great potential use for lots of analytes. Copyright © 2013 John Wiley & Sons, Ltd.     

Incorporation of Benzocyclobutene Cross-Linkable Moieties in Poly(Methyl Acrylate): A Novel Approach to Shape-Memory Polymers Accompanied with Microphase Separation

Benzocyclobutene (BCB) moieties were incorporated into a typical polyolefin, poly(methyl acrylate), by free radical copolymerization of benzocyclobutene-4-yl acrylate and methyl acrylate. The subsequent cross-linking of the generated copolymers by ring-opening reaction of BCB gave rise to shape-memory polymers. This new cross-linking process did not require cross-linker and yielded small molecules. Most importantly, submicron-sized particles within the cross-linked polymers, which were observed using atomic force microscope, were induced by this cross-linking strategy. The results of the shape-memory tests suggested that the cross-linked polymers displayed good shape-memory performance.     

Novel application of 1-/2-phenyl substituted 9,10-anthraquinones in solid electrochromic devices

1-/2-phenyl substituted 9,10-anthraquinones were synthesized via Suzuki coupling reactions of 1-/2-iodo-9,10-anthraquinones with benzeneboronic acid. They are efficient and reversible electrochromic materials and their solid electrochromic devices were prepared. When reduced, the device color of 1-phenyl-9,10-anthraquinone shifts from yellow to claret while that of 2-phenyl-9,10-anthraquinone switches from yellow-green to a dark blue-purple. Their different characteristics and behaviors in electrochromic devices are only determined by the different substituted positions of the phenyl group. They are potentially to be widely applied in commercial application for the excellent behaviors plus the inexpensive starting materials and short synthetic routes.     

Determination of Armillarisin A in Rat Plasma by SPE and LC-MS-MS

A rapid, sensitive and convenient ultra-performance liquid chromatography-tandem mass spectrometry method was developed and validated for the determination of armillarisin A in rat plasma. Following hydrophilic–lipophilic balance solid-phase extraction, armillarisin A and propylparaben (internal standard) were separated using a gradient elution program on a C₁₈ column and detected by mass spectrometry in the negative ion mode with the multiple reaction monitoring mode. The total chromatographic running time was short (1.8 min). The method was linear over the concentration range of 0.5–250.00 ng mL^?1 for armillarisin A. The lower limit of quantification of armillarisin A was 0.5 ng mL^?1, using as little as 100 μL plasma. The intra-day and inter-day relative standard deviations were less than 15% and the relative errors were all within 10%. The extraction recovery for armillarisin A was approximately 100%, and no absolute matrix effect was observed. Finally, the method was successfully applied to a preclinical pharmacokinetic study of armillarisin A in four rats following an intravenous administration.     

Langmuir and Langmuir-Blodgett films of a novel tryptophan peptide lipid

A novel tryptophan peptide lipid, C18H35O (SA)-Gly-Trp-Gly-OH, was synthesized and studied for its surface chemistry and spectroscopic properties.     

LF—11激光装置的高效率倍频系统

本文介绍了LF—11激光装置高效率倍频系统的原理和结构,阐述了实现高效率倍频的各种技术途径,给出了倍频的转换效率,晶体的调谐半宽度以及基频激光和倍频激光的远场发散角,近场分布和时间波形等实验结果,利用该系统进行了0.53μm波长激光的ICF实验。     

OPTIMUM FRAME SYNCHRONIZATION AND PERFORMANCE OVER BINARY SYMMETRIC CHANNEL

The fixed frame length maximum correlation method which is the optimum methodover the binary symmetric channel has been proved.With Poisson distribution,the frame syncacquisition probability is obtained and followed by computer simulation.By Markov modelingtechniques,the probability and the mean time into lock mode are given.Finally,it is shown thatthe optimum frame sync method is far superior to conventional,and it is very useful in practice.     

A New Reducibility between Turing- and wtt-Reducibility

A new reducibility between Turing and weak truth-table reducibility is defined, which gives an affirmative answer to the open question about the existence of such an intermediate reducibility proposed formally by M. Stob. Mathematics Subject Classification: 03D25.