Evaluation of important fatty acid ratios in poultry feed lipids by ATR FTIR spectroscopy

A rapid, simple and reproducible single bounce attenuated total reflectance (SB-ATR) Fourier transform infrared (FTIR) spectroscopic method was developed for determination of the n − 6, n − 3 and ratio of n − 6:n − 3 polyunsaturated fatty acids (PUFAs) in poultry feed lipids using partial least squares (PLS) regression. Data for n − 6, n − 3 and ratio of n − 6:n − 3 was acquired by gas chromatography (GC) and used as a standard values for FTIR calibration. The best regression results were achieved using first derivatives of the 1475–650 cm⁻¹ spectral region for n − 6, n − 3 and ratio of n − 6:n − 3 with high regression coefficients (R²) of 0.999, 0.994 and 0.998, respectively and low RMSEP values of 1, 0.06 and 0.83, respectively. The results of the present study revealed that FTIR could be used for rapid and accurate determination of n − 6, n − 3 and ratio of n − 6:n − 3 PUFAs present in poultry feed lipids.     

全超导托卡马克极向场超导线圈的失超检测

EAST装置做为全超导托卡马克装置,其纵场和极向场线圈全部由超导磁体组成,所以进行安全,准确,有效的超导线圈的失超保护是装置安全运行的首要环节.由于等离子体电流的建立必须由极向场线圈系统提供极快速的磁通变化,随之产生较高的交流损耗使得极向场线圈很容易发生失超.如何对快速交变脉冲磁场下的超导线圈进行有效的失超检测,这在世界上也无先例可循.EAST装置的失超检测系统经过几十轮单饼超导线圈实验及多轮装置正式放电实验后逐步建立和完善起来,并已通过工程验收满足了装置实验运行要求.本文主要介绍了EAST装置失超检测系统的基本结构和检测原理,重点阐述了极向场超导磁体失超检测的设计方法及实验结果。     

New recyclable catalytic system: PdCl2–Dppc+ PF6−–[bmim][PF6] for the Suzuki coupling reaction

An air‐stable and highly efficient PdCl₂–Dppc⁺ PF₆^?–[bmim][PF₆] catalytic system has been developed for the Suzuki coupling reaction of various aryl bromides with phenylboronic acid. The catalytic system can be recycled at least 10 times with minimal loss of activity. Copyright © 2006 John Wiley & Sons, Ltd.     

Proteomic characterization of human platelet-derived microparticles

Microparticles (MPs) are small fragments of apoptotic or activated cells that may contribute to pathological processes in many diseases. Platelet-derived MPs (PMPs) are the most abundant type of MPs in human blood. To characterize the proteins in PMPs we used a shotgun proteomics approach by nanoHPLC separation followed by MS analysis on an LTQ Orbitrap XL. PMPs were produced from isolated platelets stimulated with adenosine diphosphate (ADP). We developed an analytical platform constituted by two different steps: in the first one we used a standard shotgun strategy; in the second one, to improve low-molecular weight, low-abundance-proteins identification, the samples were fractionated using hydrogel nanoparticles, an enrichment system based on a mixed mechanism of dimensional exclusion and colorant affinity. This was chosen to tackle a common issue with shotgun approaches, in which the low-abundance proteins are not detected when surveys are on a broad scale. By means of the entire analytical platform, we identified 603 proteins, 243 of which were not previously identified. A simple and straightforward procedure for the study of PMPs was provided, producing a tool for further understanding their biological and pathological roles, and a baseline for future studies aimed at discovering biomarkers involved in several diseases.     

Dppc+PF6−–PdCl2–[bmim][PF6]–a copper‐free recyclable catalytic system for Sonogashira coupling reaction

An air‐stable, copper‐free and highly efficient Dppc⁺PF₆^?–PdCl₂–[bmim][PF₆] catalytic system has been developed for the Sonogashira coupling reaction of aryl iodides with various aryl‐ and alkylacetylenes. The catalytic system allows for facile separation and can be recycled at least eight times with minimal loss of activity. Copyright © 2007 John Wiley & Sons, Ltd.     

冷却储存环主环注入线二极磁铁测量

 介绍了兰州重离子加速器冷却储存环工程主环注入线二极磁铁的测磁系统和测磁结果。着重分析了垫补线圈和极头削斜两种手段对C型弯曲二极磁铁积分磁场径向分布均匀度的调节效果。并且分析了TOSCA三维磁场计算程序与实际测量结果之间的误差及其产生的原因。     

1MJ高温超导储能磁体的设计方案研究

微型超导储能系统（SMES）可用于改善电能质量和电力系统的动态稳定性，但在应用中需满足漏磁场的要求，本文主要以储能量为1MJ的超导储能磁体为例，结合多种有源屏蔽型超导储能磁体的结构特点，主要包括轴线平行、组合式环型，研究了有源屏蔽微型超导储能磁体的方案．对以上这两种类型的超导储能磁体进行了优化设计，并对优化结果进行了比较分析．     

Reconstructing very short TE phase rotation spectral data collected with multichannel phased-array coils at 3 T

Phased-array volume coils were used in conjunction with the phase rotation STEAM (PR-STEAM) spectroscopy technique to acquire very short TE data from the anterior cingulate gyrus at 3 T. A method for combining PR-STEAM data from multiple subcoils is presented. The data were acquired from seven healthy participants using PR-STEAM (repetition time/mixing time/echo time=3500/10/6.5 ms, 6 cm³, NEX=128, spectral width=2000 Hz, 2048 complex points, Δφ₁=135°, Δφ₂=22.5°, Δφ₃=112.5° and Δφ_ADC=0°). In addition to the primary metabolites, LCModel fit results suggest that glutathione and glutamate can also be identified with Cramér-Rao lower bounds of 10% or less.     

共轭聚合物的结构缺陷及对光电性能的影响

共轭聚合物是由大量重复基元通过化学键连接的一维体系,具有独特的光、电、电化学等性质,已经引起学术界的广泛关注.由于共轭聚合物结构(链段、构象、聚集态)的复杂性,即使在非常精细的合成条件下,少量结构缺陷的形成也是难免的.共轭聚合物,特别在其固态状态下激发能量能够有效传递,使得少量缺陷的影响被放大,对其光电性质产生巨大影响.因此对共轭聚合物结构缺陷的研究,包括缺陷成因与控制、缺陷密度的分析、缺陷的分子结构与电子结构特征等,对于高品质材料的研发具有重要的意义.本文对国内外研究进展进行了比较详尽的介绍.     

HL-2M ������Ȧ�Ѽ����Ӧ������

介绍了HL-2M环向场线圈的基本结构设计及其承受的电磁载荷,分析了水平预加载、中心柱预应力筒以及环向抗扭支撑对线圈匝间剪切应力的影响.结果表明,水平预加载及预应力筒在中心柱内产生的压应力有利于提高中心柱的抗扭刚度;环向支撑刚度增加可减小线圈的面内剪切应力.在正常运行工况下,环向场线圈的最大匝间剪切应力小于8MPa,其结构设计满足线圈强度要求.对于大破裂瞬态事件,匝间最大剪切应力约12MPa,接近绝缘材料的剪切疲劳极限,建议采取破裂抑制措施避免该情况发生.