花生分离蛋白与蓝园鲹酶解物TGase交联产物的乳化特性

利用转谷氨酰胺酶(TGase)将花生分离蛋白(PPI)与蓝园鲹酶解物(DPH)进行酶法交联,并经高压均质制成O/W型乳状液,研究TGase的交联作用对乳状液粒度分布、表面积平均粒径、显微结构及离心乳析率等的影响.结果表明:TGase可促使PPI与不同水解度的DPH交联,与交联前的电泳图相比,低分子质量亚基条带(14~31 ku)消褪,高分子质量亚基条带(大于97 ku)生成;DPH的水解程度对交联物的乳化性有重要影响,水解度为5.5%时所得交联物具有较好的乳化特性;交联作用提高了PPI-DPH异源蛋白的乳化活性与乳化稳定性.     

基于损失时间的单点交叉口信号相序优化模型

以定时控制交叉口混合交通流为对象,重点研究如何通过相序优化降低交叉口损失时间的问题.首先提出了基于信号灯组(包括机动车灯组VG、非机动车和行人灯组PG)的绿灯间隔矩阵、相位相序、相位最大间隔矩阵、相位间隔和矩阵,以及矩阵之间元素相互关系的数学表达.然后,建立了以VG损失时间之和、VG最大间隔时间之和、VG和PG所有损失时间之和,以及VG和PG最大损失时间之和等四类相位损失时间最少为目标的相序优化模型.通过一个四相位信号控制十字交叉口的实际数据验证:相序组合不同,交叉口的损失时间不同;是否考虑行人、自行车交通,对于最佳相序的影响较大.该模型可以求得面向混合交通流多种目标下的最佳相序解.还进一步地分析了四类优化目标下信号损失时间的设置模式,以及通过基于信号灯组设置信号间隔时间以降低交叉口损失时间的方法.     

Contrastive analysis on tone between Putonghua and Taiwan Mandarin

The differences of the pitch and duration of Chinese syllables between Putonghua （PTH） and Taiwan Mandarin （TM） were studied. The speech materials to be used are not only isolated syllables, but also sentences. The results reveal that： For the isolated syllables, T1 and T2 in TM are influenced by Minnan dialect, therefore their pitch are lower than those in PTH. T3 is fall-rise in PTH, while it is fall in TM. Moreover, the syllable duration sequence for different tone is T3〉T2〉T1〉T4 in PTH, while it is T1〉T2〉T3〉T4 in TM. For the syllables in sentences, T2 is mid-rise in PTH, while it is mid-level in TM. And the T3 is longer than T4 but shorter than T1 or T2 in PTH, while it is the shortest in TM. Furthermore the effects of prosodic phrase boundary on duration for different tones are almost the same in PTH, but the lengthening part of T1 or T2 is longer than that of T3 or T4 in TM.     

利用聚类算法找出新的攻击

改进了利用聚类算法查找孤立点的算法，提出在应用到入侵检测的过程中应该结合领域知识、考虑数值性质，这样可以提高检测质量。通过对收集到的网络数据的属性进行计算，找出其中的孤立点，可以使得检测系统在不需要手工编码和标识的训练数据前提下就能检测出攻击。最后通过比较多组实验数据，提出了一种比较有效的检测策略。     

High-order harmonic generation of CO_2 with different vibrational modes in an intense laser field

We apply the strong-field Lewenstein model to demonstrate the high-order harmonic generation of CO_2 with three vibrational modes(balance vibration,bending vibration,and stretching vibration) driven by an intense laser field.The results show that the intensity of harmonic spectra is sensitive to molecular vibrational modes,and the high harmonic efficiency with stretching vibrational mode is the strongest.The underlying physical mechanism of the harmonic emission can be well explained by the corresponding ionization yield and the time-frequency analysis.Finally,we demonstrate the attosecond pulse generation with different vibrational modes and an isolated attosecond pulse with a duration of about 112 as is generated.     

具有高次强非线性项的发展方程的精确孤波解

本文给出求几类具高次强非线性项的发展方程精确孤波解的方法,它可推广到高维的情形     

Isolated and essentially isolated Volterra-type integral operators on generalized Fock spaces

We studied some topological properties of the space of bounded Volterra-type integral operators on generalized Fock spaces with weight function growing faster than the classical Gaussian function. In particular, the connected and path-connected components, isolated and essentially isolated points of the space are described. The result shows that while the space contains all the non-compact operators as its isolated points, it fails to admit essentially isolated points.     

Stable Non‐IPR C60 and C70 Fullerenes Containing a Uniform Distribution of Pyrenes and Adjacent Pentagons

The most abundant fullerenes, C₆₀ and C₇₀, and all the pure carbon fullerenes larger than C₇₀, follow the isolated‐pentagon rule (IPR). Non‐IPR fullerenes containing adjacent pentagons (APs) have been stabilized experimentally in cases where, according to Euler’s theorem, it is topologically impossible to isolate all the pentagons from each other. Surprisingly, recent experiments have shown that a few endohedral fullerenes, for which IPR structures are possible, are stabilized in non‐IPR cages. We show that, apart from strain, the physical property that governs the relative stabilities of fullerenes is the charge distribution in the cage. This charge distribution is controlled by the number and location of APs and pyrene motifs. We show that, when these motifs are uniformly distributed in the cage and well‐separated from one other, stabilization of non‐IPR endohedral and exohedral derivatives, as well as pure carbon fullerene anions and cations, is the rule, rather than the exception. This suggests that non‐IPR derivatives might be even more common than IPR ones.     

几何位置对封闭方腔内水平孤立平板自然对流换热的影响

本文以冰箱蒸发器等实际问题为背景，以空气为介质用数值模拟方法研究了封闭方腔内水平孤立平板层流自然对流时Ｒａ数及平板位置变化对Ｎｕｍ的影响，得出了可供工程应用参考的结论。同时用烟可视化的实验验证了计算结果的正确性。     

单纯收缩期高血压患者颈动脉频谱特征分析

目的:应用彩色多普勒超声研究单纯收缩期高血压患者的颈动脉频谱变化。方法:对158例单纯收缩期高血压患者及30例单纯舒张期高血压患者、32例收缩期高血压合并舒张期高血压患者进行彩色多普勒超声颈动脉检测。结果:原发性高血压患者的颈动脉超声表现均为内径增宽、中-内膜厚度增厚(平均增厚1.0～1.4 mm)、峰值流速减慢;单纯收缩期高血压患者的颈动脉阻力指数明显增高(颈总动脉:0.86±0.07、颈内动脉:0.73±0.06、颈外动脉:0.91±0.09)。结论:研究显示彩色多普勒超声检测颈动脉阻力指数,对原发性高血压的分型有明确的指导意义。