A Novel Method for Wavelength Conversion with Dual-pump Four-wave Mixing in a Semiconductor Optical Amplifier

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　ＩｎｔｈｅＷＤＭｎｅｔｗｏｒｋ ,ｔｈｅｄｅｓｉｒａｂｌｅｆｅａｔｕｒｅｓｏｆａｎａｌｌ ｏｐｔｉｃａｌｗａｖｅｌｅｎｇｔｈｃｏｎｖｅｒｔｅｒｉｎｃｌｕｄｅｐｏｌａｒｉｚａｔｉｏｎｉｎｓｅｎｓｉｔｉｖｉｔｙ ,ｔｒａｎｓｐａｒｅｎｃｅｔｏｍｏｄｕｌａｔｉｏｎｆｏｒｍａｔａｎｄｂｉｔ ｒａｔｅ ,ｆｕｌｌｔｕｎａｂｉｌｉｔｙ ,ａｃｃｅｐｔａｂｌｅｏｕｔｐｕｔＳＮＲｏｖｅｒｔｈｅｅｎｔｉｒｅｒａｎｇｅｏｆｔｈｅｗａｖｅｌｅｎｇｔｈｓｕｓｅｄｉｎｔｈｅｎｅｔｗｏｒｋ[1] .Ｗａｖｅ…     

弹性大变形问题中的应力状态描述、奇异性问题和余能原理

对弹性大变形理论中的3方面问题进行了综述.首先,对各种应变度量的共轭应力进行综述.大变形问题引起的应力状态描述的复杂性引起了许多学者的兴趣,对这个问题的研究也促进了大变形弹性理论的发展.在各种特定问题中,人们提出了不同的应力张量来描述应力状态,如Caucby应力张量、第一类和第一二类Piola-Kirchhoff应力张...     

Hybrid-Trefftz有限元法的研究进展

系统概述了Ｈｙｂｒｉｄ Ｔｒｅｆｆｔｚ有限元法及其在弹性力学中的应用．该单元模型由于在插值函数上的灵活选择性使其比普通有限元能更有效地处理局部效应问题,如孔洞,集中荷载等．通过适当选择单元插值函数可构造出高精度的ｐ－扩展元和一系列满足特殊条件的新单元,以在同等条件下提高计算精度      

Intermolecular cyclocondensation reaction of 3,4-dihydropyrimidine-2-thione under the Mitsunobu reaction conditions

A self-intermolecular cyclocondensation reaction of 3,4-dihydropyrimidine-2-thione(DHPM) to give a novel tricyclic structure containing DHPM core in the presence of diethyl azodicarboxylate(DEAD) and triphenylphosphine(TPP) at room temperature is reported.     

Expression and Characterization of the Intracellular Part of Receptor Protein Tyrosine Phosphatase PTPRU

PTPRU is an MAM domain-containing receptor-like protein tyrosine phosphatase. Previous studies have demonstrated an important role of the enzyme in the maintenance of epithelial integrity and in the regulation of the Wnt/β-catenin signaling pathway. To better understand the function of PTPRU, we cloned and expressed the intracellular portion of PTPRU as a GST fusion protein in E. coli cells. We purified the protein to homogeneity and used it to immunize mice for antibody production. The resultant antibody s...     

Structure of MgSO_4 in Concentrated Aqueous Solutions by X-Ray Diffraction

Detailed time-and-space-averaged structure of MgSO4 in the concentrated aqueous solutions was investigated via X-ray diffraction with an X’pert Pro θ-θ diffractometer at 298 K, yielding structural function and radial distribution function(RDF). The developed KURVLR program was employed for the theoretical investigation in consideration of the ionic hydration and ion association. Multi-peaks Gaussian fitting method was applied to deconvolving the overlapping bands of Differential radial distribution function...     

Synthesis of cyclicβ-silylenones via oxidative rearrangement of tertiaryα-hydroxy allylsilanes with PCC

An oxidative rearrangement of cyclic tertiary a-hydroxy allylsilanes has been carried out in refluxing ClCH₂CH₂Cl with pyridinium chlorochromate（PCC）.The reaction provides a convenient method to synthesize cyclicβ-silylenones in modest to excellent yields.     

Design and Synthesis of Chiral Molecular Tweezers Based on Deoxycholic Acid

Molecular tweezers is a novel type of artificial receptors, which not only offer the advantage of efficient construction but also their surfaces can be tailored for specific applications. The clefts of molecular tweezers are particularly effective in regard to complementarity with substrates since functional groups attached to the interior of the cleft converge on substrates held inside1. So, in recent years, the molecular tweezers receptors have attracted more and more attention in molecular …     

IMMOBILIZED CIBACRON BLUE F3G-A ON CROSSLINKED POLY(VINYL ALCOHOL) FOR AFFINITY CHROMATOGRAPHY

1. INTRODUCTION Biospecific affinity chromatography is a powerful technique for purification of proteins [1]. The biological affinity ligands in common use include enzyme substrates, inhibitors, cofactors, receptors, antibodies, etc. The advantage of these biological ligands is their very high recognition specialty for particular proteins. As a result, proteins can be purified in fewer steps, often to homogeneity, in a laboratory scale. However, scale-up of the analytical and laboratory p…     

First Total Synthesis of 5_α-Hydroxy-isopterocarpolone

Sesquiterpenic compounds of the Eudesmane family have attracted considerable attention due to their intriguing biological properties1,2, particularly significant antifeedant activity, cell growth inhibitory and plant growth regulating activities.In 1996, J. Hu and co-workers3 had isolated eudesmane sesquiterpene 5?-hydroxy-isopterocarpolone 1 from the aerial parts of chinese folk medicine Artemisia eriopoda and elucidated its structure by spectropic methods. Herein, we reported the first tota…