重离子辐照玉米种子M1代诱变效应研究

用重离子^7Li和^12C以及^60Co的γ射线分别辐照玉米种子胚，研究重离子束辐照玉米种子M1代的生物学效应．结果表明:^60Co的丫射线使种子的发芽势和发芽率降低，重离子^7Li和^12C对发芽势和发芽率的抑制作用不明显；重离子辐照后，单株之间光合速率差异增大；M1代植株在雄性育性、叶片颜色及株高等方面发生了多种变化，并产生了一株双胚苗．应用随机多态性DNA分析技术，发现双胚苗的大、小苗之间及其与亲本自交系478在随机多态性DNA指纹上存在的差异，从分子水平上初步证实了双胚苗为自交系478的变异类型．In order to study M_(1) biological effects of heavy ion irradiation on maize seeds, the embryos of dry maize seeds are irradiated with~(7)Li ions and~(12)C ions as well as ~( 60)Co gamma rays. The results are as follows: ~( 60)Co gamma rays decrease germination impetus and germination rate of maize seeds, while the inhibitory effects of germination impetus and germination rate induced by the heavy ions~(7)Li and~(12)C are not significant. The difference of photosynthetic rates among the plants irradiate...     

三维人脸测量与分割系统研究

三维人脸的测量与分割有着广泛的应用需求,是目前重要的研究方向,但三维人脸数据的庞大、无序等问题制约了其快速发展。首先开发了基于结构光方法的三维人脸测量系统,获得以点云形式存储的高精度三维人脸数据。其次,采用保角变换对三维人脸数据进行了预处理,并采用二维卷积神经网络分割结合三维反映射的思路,实现了三维人脸的分割,解决了三维数据的无序性以及旋转性,降低了三维数据分割的时间消耗。实验结果表明,本文提出的三维人脸测量系统精度可达0.5 mm,三维分割的平均交并比可达0.78,二维分割结合三维反映射的整体效率明显高于直接进行三维分割的效率。     

格值一阶逻辑系统LF（X）中带广义量词的α-归结原理

讨论格值一阶逻辑系统LF(X)中带广义量词的α-归结,证明了带广义量词的Herbrand-定理,为格值一阶逻辑系统中带广义量词的不确定性自动推理作了理论的准备.     

α-Si_(1-x)C_x∶H薄膜材料的弹性反冲探测分析

介绍在中国原子能科学研究院HI 13串列加速器上,对α Si1-xCx∶H薄膜样品进行弹性反冲探测分析的方法和结果.用该加速器提供的高品质127I束流轰击α Si1-xCx∶H薄膜材料样品,用ΔE(gas) E(PSD)望远镜探测器,在前角区(30°角)测量从该样品中反冲的各元素的能谱.然后用离子束分析(IBA)程序SIMNRA对能谱进行拟合,得到样品中H,C和Si的比分及深度分布.     

格值一阶逻辑系统LF(X)中带广义量词的不确定性推理

讨论格值一阶逻辑系统LF(X)中带广义量词的不确定性推理规则,和FMP、FMT规则。为研究带广义量词的归结自动推理作准备,也为研究语言值逻辑推理提供一阶逻辑系统的基础平台。     

大孔吸附树脂分离纯化迷迭香酸的研究

采用大孔吸附树脂法研究迷迭香酸的精制工艺。筛选出适合的大孔吸附树脂,并对其分离纯化的条件进行考察。使用静态吸附法确定大孔吸附树脂NK109最适于迷迭香酸的精制。通过动态吸附性能的考察,确定最佳迷迭香酸上柱浓度838.6mg/L,流速为2.0BV/h上柱。通过动态解吸性能的考察,使用乙酸乙酯作为洗脱液,确定洗脱速度为1.0BV/h。利用大孔吸附树脂,迷迭香酸得到了较好的富集和纯化。纯化后的迷迭香酸纯度可以达到90%以上。     

毛细管电泳激光诱导荧光检测信号的小波滤噪

采用小波滤噪方法对毛细管电泳激光诱导荧光检测信号进行了处理，研究了小波变换中小波基的选择及噪声阈值的选择对滤噪的影响。结果表明，采用DB4小波基能有效消除毛细管电泳激光诱导荧光检测信号中存在的噪声，使信噪比得到较大改善。     

叔丁氧羰基单端基保护己二胺的合成

以己二胺为原料，叔丁氧羰基酸酐(Boc2O)为保护剂，合成了Boc单端基保护己二胺。并用IR和^1H NMR对产物进行了表征。该化合物可用作氨基酸的N-羰基环内酸酐(NCA)开环聚合法合成结构明晰的两嵌段聚氨基酸的引发剂，因而具有良好的应用前景。     

用温度敏感高分子为载体的激光光声免疫分析及其应用

将单克隆抗乙肝表面抗原体抗与温度敏感高分子聚Ｎ－异丙基丙烯酰胺连接，中液相中与抗原、酶标抗体反应，通过热沉淀实现与游离酶标体抗体的异相分离。高分子载休的引入能减少非特异性吸附，罗大相载体聚乙烯酶标板更有利于激光光声技术高灵敏度优势的。同时，采用０．５％的十二烷基硫酸钠水溶液作显色终止剂，易与Ｈｅ－Ｎｅ激光波长匹配，实现了对低值乙肝表面抗原阳性血清的检测。     

Effect of substrate curvature on thickness distribution of polydimethylsiloxane thin film in spin coating process

The polymer spin coating is critical in flexible electronic manufaction and micro-electro-mechanical system(MEMS)devices due to its simple operation, and uniformly coated layers. Some researchers focus on the effects of spin coating parameters such as wafer rotating speed, the viscosity of the coating liquid and solvent evaporation on final film thickness.In this work, the influence of substrate curvature on film thickness distribution is considered. A new parameter which represents the edge bead effect ratio(re) is proposed to investigate the influence factor of edge bead effect. Several operation parameters including the curvature of the substrate and the wafer-spin speed are taken into account to study the effects on the film thickness uniformity and edge-bead ratio. The morphologies and film thickness values of the spin-coated PDMS films under various substrate curvatures and coating speeds are measured with laser confocal microscopy. According to the results, both the convex and concave substrate will help to reduce the edge-bead effect significantly and thin film with better surface morphology can be obtained at high spin speed. Additionally, the relationship between the edge-bead ratio and the thin film thickness is like parabolic curve instead of linear dependence. This work may contribute to the mass production of flexible electronic devices.