Syntheses of Novel Asymmetric Cyclopentanone Dyes and Measurement of Two－photon Absorption Cross－section

A simple synthesis route with a high yield of novel asymmetric cyclopentanone dyes 3a—3e and their highly two-photon up-converted fluorescences are reported. The dyes have good solubilities in most of ordi-nary solvents, a wide UV absorption wavelength range from 380—540 nm, and high fluorescence quantum yields. The two-photon absorption cross-sections of dyes 3a—M were measured in chloroform by a two-pho-ton induced fluorescence method. All of these properties of the new dyes make them suitable for being used as two-photon fluorescent probes.     

掺Er磷酸盐玻璃中红外发光特性研究

报道了一种最新型可用于1．5μm光纤通信传输介质的掺Er^3 的磷酸盐玻璃,通过对其吸收谱的测量,可看到在970nm附近有一很强的吸收峰,适合于采用LD激光泵浦。我们在发射波长为970nm的半导体激光器激发下测量了这种材料的发射谱,观察到在红外波段1540nm处在强发射峰。我们从吸收谱出发拟合出了J－O强度参数,进而计算出了Er^3 离子各相关跃迁的理论振子强度、实验振子强度及自发辐射系数,从结果可得出理论和实验是相符的。     

Electrospinning of Biomaterials for Vascular Regeneration

Cardiovascular diseases have been the leading cause of morbidity and mortality in the world recently. With the growing aging population accompanied by chronic diseases, such as uremia and diabetes, there is an increasing clinical demand for vascular grafts with proper performance. Although some achievements have been made in the development of tissue-engineered vascular grafts composed of natural and synthetic polymeric materials or decellularized vessels, clinical applications with a diameter of less than 6 mm are still principally derived from autografts, such as autologous saphenous veins. Many challenges remain in anti-thrombosis, rapid endothelialization, modulating the inflammatory response and inhibition of intimal hyperplasia and calcification. In the review, recent progress in the electrospinning of biodegradable polymers for vascular regeneration are summarized, especially from the view of biomechanical factors. Hybrid vascular grafts consisting of natural and synthetic polymers with multicomponent, di-or tri-layers are focused in order to provide novel experiences in biomaterials for applications in this field.     

快速推求等效组态的原子谱项

本文根据置换群方法，运用Ｃ语言编制了计算程序，可快速、准确地推求等效组态ｓ＾Ｎ、ｐ＾Ｎ、ｄ＾Ｎ、ｆ＾Ｎ、…ｘ＾Ｎ、ｙ＾Ｎ、ｚ＾Ｎ的原子谱项。     

N-(2-甲氧羰基-1-甲基)-乙基-(N′-D-乙酰基吡喃型糖)硫脲类化合物的合成及生物活性

N-(2-甲氧羰基-1-甲基)-乙基-(N′-D-乙酰基吡喃型糖)硫脲类化合物的合成及生物活性;糖基硫脲;β-氨基丁酸;合成;生物活性     

新型铼系聚吡咯络合物（PPREC）结构与吸附小分子行为的研究

应用ＣＮＤＯ／２研究了铼系聚吡咯络全物的结构及吸附小分子的行为，探究了吸附过程的微观机制。优化了各个体系的几何构型，得到了稳定性与相对于能量、结合能、吸附取向、分子间距的依存关系。     

Particle identification using artificial neural networks at BESⅢ

A multilayered perceptrons' neural network technique has been applied in the particle identification at BESⅢ. The networks are trained in each sub-detector level. The NN output of sub-detectors can be sent to a sequential network or be constructed as PDFs for a likelihood. Good muon-ID, electron-ID and hadron-ID are obtained from the networks by using the simulated Monte Carlo samples.     

面向对象的BESⅢ探测器模拟系统

BESⅢ探测器的模拟软件包BOOST, 是基于Geant4开发的面向对象的模拟软件. BOOST全面地模拟了BESⅢ探测器的物质和几何结构, 给出了粒子在各个子探测器中的击中信息, 以ASCII码文件的形式输出原始数据和MC truth信息可供重建软件开发和物理分析使用, 初步结果显示BOOST的模拟是合理的.     

Study of low momentum track reconstruction for the BESⅢ main drift chamber

In order to overcome the difficulty brought by the circling charged tracks with transverse momentum less than 120 MeV in the BESⅢ Main Drift Chamber(MDC),a specialized method called TCurlFinder was developed.This tracking method focuses on the charged track reconstruction under 120 MeV and possesses a special mechanism to reject background noise hits.The performance of the package has been carefully checked and tuned by both Monte Carlo data and real data.The study shows that this tracking method could obviously enhance the reconstruction efficiency in the low transverse momentum region,providing physics analysis with more and reliable data.