干红枣ASE提取物的GC/MS分析及其在卷烟中的应用

采用加速溶剂萃取法（ASE）萃取干枣中的香味成分,并进行毛细管气相色谱/质谱（GC/MS）分析和卷烟加香应用效果研究。结果表明：利用GC/MS从干红枣ASE提取物中共鉴定出35个挥发性成分,其中主要香味成分是：5-羟甲基糠醛、环十六内酯、十五-14-烯酸、2,3-二氢-3,5-二羟基-6-甲基-4H-吡喃-4-酮、棕榈酸、2-羟基-环十五酮、十八-9-烯醛、十八-9-烯酸、氧杂环十三-2-酮、1,3-环戊二酮和己酸等。香味轮廓分析法和卷烟应用实验显示：干红枣ASE提取物能有效地掩盖卷烟杂气,提高烟香丰富性,使烟气柔和细腻。     

乙酸酐衍生化气相色谱法测定小麦非淀粉多糖的单糖组成

采取乙酸酐衍生化气相色谱法测定从小麦麸皮中提取的2种可溶性非淀粉多糖（non-starch polysaccharides,NSP）的单糖组成。所制备的小麦水提取NSP和碱提取NSP中主要的单糖组成是阿拉伯糖和木糖,另外还含有少量的葡萄糖、甘露糖和半乳糖。测定方法的回收率在95.56%—98.62%之间。     

基于径向基神经网络和BP神经网络对日落黄荧光光谱的分析

对食用合成色素日落黄的荧光光谱进行研究,发现在最佳激发波长370nm紫外光的激励下,荧光峰值波位于576nm;经分析认为,日落黄溶液之所以能产生荧光是因为分子中偶氮键将一个苯环和一个萘环连接在一起,形成大共轭结构,并且取代基与—SO3Na与—OH处于萘环的对位,大大增强了日落黄分子的共轭程度,使其具有强的吸光功能,发出强荧光。另外,结合径向基神经网络和BP神经网络对未知样本进行浓度预测,结果精确,平均相对误差分别为3.51%和5.45%,RSD分别为1.83%和2.95%。该方法有望成为对食用合成色素进行高效检测的有效方法。     

卷烟制品中糖类物质的热解研究进展

糖类物质是天然烟草成分,其按重量计最多可占烟草总量的20%。糖类也常作为添加剂在烟草制品中广泛使用,如作为保润剂、粘合剂、香味剂等。质谱是研究糖类物质在烟草制品中行为的重要方法。烟草制品中的糖类可改善产品香气和品味,但也会热解产生如甲醛、乙醛、丙酮等有害成分。本文概述了糖类裂解研究的进展。     

吹扫捕集气相色谱法分析化妆品中挥发性化合物

建立了同时测定化妆品中7种挥发性化合物的吹扫捕集气相色谱法（PT-GC）,该方法最大的优点就是不用任何有机溶剂对样品萃取和浓缩,减少了对环境的污染,具有灵敏度高、检出限低、定量准确、操作简便等特点。结果表明：此方法有较好的重复性,相对标准偏差在6%以下;检出限为0.3056-7.1373ng/mL;7种物质的回收率在80.87%—107.15%之间。     

The β Decay of 21N

The β-delayed neutron and γ energy spectra taken from the decay of neutron-rich nucleus ²¹N were measured by using the β-γ and β-n coincidence detection method. Thirteen new neutron groups ranging from 0.28MeV to 4.98MeV and with a total branching ratio of 88.7±4.2% were observed andpresented. One γ transition with an energy of 1222keV emitted from the excited state of ²¹O, and four γ transitions with energies of 1674, 2397, 2780, and 3175keV emitted from the excited states of ²⁰O were identified in the β decay chain of ²¹N. The β decay half-life for ²¹N is determined to be 82.9±1.9ms. The uncertainty of half-life is much smaller than the previous result.     

A Single Photon Imaging System Based on Wedge and Strip Anodes

A new prototype of single photon imaging system based on wedge and strip anodes is developed. The prototype can directly measure the intensity and position information for an ultra-weak radiant source which takes on the character of single photons. The image of the ultra-weak radiant source can be reconstructed with a wedge and strip anodes detector and an electronic readout subsystem by photon counting and photon position sensitive detecting in a period of time. With proper evaluation, the prototype reveals a spatial resolution superior to 150μm, a 66-kHz maximal counting rate and a dark-count below 0.67 count /cm^2 s.     

Directly Trapping Atoms in a U-Shaped Magneto-Optical Trap Using a Mini Atom Chip

We experimentally demonstrate the trapping of ^85Rb atoms directly on a chip-size U-shaped magneto-optical trap （U-MOT）. The trap includes a U-shaped wire on the chip, two bias magnetic field coils and laser beams. The capture volume of the U-MOT is theoretically calculated, and the trap is experimentally realized. With 2 A current applied to the U-shaped wire and 2-Gauss horizontal bias field, more than 2 × 10^6 atoms are trapped. In contrast with an ordinary mirror-MOT, this U-MOT captures atoms directly from the background, thus the trap size is greatly reduced. Based on this mini trap scheme, it is possible to realize a chip-size atom trap array for quantum information processing.     

字母屏的夫琅禾费衍射分析及计算机模拟

利用电寻址液晶光阀实验系统,通过将计算机绘制的英文字母A至Z输出到液晶屏上形成物屏,拍摄了其夫琅禾费衍射图样.在理论上进行了计算比较和分析,同时结合计算机Matlab等对光强分布进行了模拟,揭示了夫琅禾费衍射中物与像的内在联系.     

超高速碰撞微波辐射强度测量

 针对超高速碰撞物理现象研究需要,为了确认超高速碰撞过程中的电磁辐射信号能作为超高速碰撞产生的可探测物理量之一,利用研制的8 mm微波辐射计在中国空气动力研究与发展中心FD-18A超高速碰撞靶开展了超高速碰撞过程中的微波辐射强度测量初步试验研究。对试验测量方案进行了介绍,获得了弹丸超高速撞击半无限铝靶和半无限铜靶时产生的微波辐射强度测量试验结果。弹丸为直径5 mm 的LY12铝球,撞击速度1.98~4.3 km/s,撞击角为0°,结果表明：在本试验条件下,超高速碰撞产生了明显的微波辐射强度,材料的不同导致碰撞过程中产生的微波辐射强度差别较大。