地形起伏变化下的边界层参数化台风风场模型

对于登陆台风来说,采用平坦下垫面和单一的地表粗糙长度假设并不能与实际情况相吻合.为了更准确地模拟台风近地面风场,基于现有参数化台风风场模型,采用随地形变化的坐标系建模方法和高精度地形与土地覆盖资料,考虑了台风登陆过程中地形起伏和土地覆盖变化的影响.针对历史上影响广东省的3个台风案例,利用大量观测数据对比和验证了改进后的台风风场模型.对比结果表明:改进后的参数化台风风场模型对风速的模拟并没有表现出明显的系统偏差,并且能较好地模拟出台风登陆过程中风速风向的时程变化.     

Kinect骨骼信息下的动态手势识别研究

针对复杂环境中存在的手势识别问题,提出一种利用Kinect传感器获取深度信息并进行动态手势识别的方法。该方法通过对Kinect传感器获取的深度信息进行分析,获取人体主要骨骼点的3D坐标,从中选取六个点作为手部运动的特征参照;为提高手势识别系统的识别速度,提出了一种基于查表的DTW算法对得到的特征数据进行模板训练并实现动态手势识别。实验结果表明:该方法具有较高的识别速度和识别率,对复杂背景及光照强度变化具有较强的鲁棒性。     

“T”型杂种小麦花药培养研究

本项研究表明,C_(17)培养基诱导小麦三系材料花药出愈,均好于其它五种培养基的诱导效果;而杂种F_1代材料花药出愈均极显著地高于不育系、保持系和恢复系材料花药的出愈频率。杂种F_1代花药在培养过程中产生愈伤组织同它们的母本不育系和父本恢复系花药出愈频率没有相关关系,杂种F_1代材料花药出愈频率同检查它们在田间套袋自交结实表现有逆相关的趋势;杂种F_1代材料花药的出愈同测得材料起身至拔节期过氧化物同工酶谱带变化也存在相关的趋势。     

1—苯基—3—甲基—4—氯代苯氧乙酰基—5—吡唑啉酮的合成

合成了三种新的β-二酮化合物——1-苯基-3-甲基-4-氯代苯氧乙酰基-5-吡唑啉酮,并通过红外、核磁共振、质谱和元素分析确定了它们的结构,初步考察了其对(UO_2)~(++)离子的萃取性能。     

广义D′ALEMBERT原理G_б~(m)+Q_б~(m)=0的应用

本文应用广义D′Alembert 原理G_σ~(m)+Q_σ~(m)=0,研讨了任意阶非线性非完整力学系统。在3N 维 Euclid 的 m 阶切空间 E_(3N)~(m)中,推导出该系统的三种形式的动力学方程组。用 G_σ~(m)+Q_σ~(m)=0求解了一例题,并与用所导出的动力学方程求解作了比较。     

激冷雾化粉末的结晶形貌与溶质原子偏析特征

本文详细讨论了激冷雾化马氏体时效钢粉末的形貌变化伴随的溶质原子的偏析特征。结果表明,随着冷却速度的增加,在粉末的结晶形貌发生树枝晶→胞状枝晶→胞状晶→痘点状晶变化的同时,溶质原子的偏析程度明显下降,偏析特征随之改变。当获得痘点状晶时,没有发现溶质原子的明显偏析。     

Role for DNA methylation in the control of cell type specific maspin expression

The major histocompatibility complex (MHC) is a source of unique individual odors that influence individual recognition, mating preferences, nesting behavior and selective block of pregnancy in animals. Such phenomena have been difficult to study in humans, because the human leukocyte antigen (HLA, human MHC) loci are the most polymorphic loci in the human genome, with the potential to generate millions of unique combinations of genotypes. In addition, high variability in background odors, encoded by the rest of the genome and influenced by cultural practices, contribute to a low signal-to-noise ratio that could mask HLA-based olfactory cues. Here we show that women can detect differences of one HLA allele among male odor donors with different MHC genotypes. Notably, the mechanism for a woman's ability to discriminate and choose odors is based on HLA alleles inherited from her father but not her mother. The parents' HLA alleles that she does not inherit show no relationship with odor choice, despite exposure to these HLA-encoded odors throughout her life. Our data indicate that paternally inherited HLA-associated odors influence odor preference and may serve as social cues.     

Nanostructure. Epitaxial diamond polytypes on silicon

Carbon is unique in the variety of configurations it can adopt with itself and other elements. Here we show how ion beams can be used to nanostructure various diamond polytypes, epitaxially aligning them to a silicon substrate. The ready controllability of ion beams, which are already used to manufacture submicrometre-scale devices, means that our findings should enable new carbon and non-carbon materials to be nanostructured for a host of applications.     

一种用于激光固化快速成形的低翘曲光敏树脂的研究

针对在激光固化快速成形过程中,树脂的收缩引起零件较大变形的问题,研究制备了一种翘曲混杂型光敏树脂,这种树脂体系结合了自由基和阳离子聚合体系的优点,克服了鎓盐引发环氧阳离子开环光聚合的缺点,其固化速度接近于自由基型光固化速度,而且固化物的力学性能有所提高,用该树脂在激光固化快速成形机上实机制作零件,零件基本没有翘曲变形,这种低翘曲性树脂扩大激光固化快速成形技术在工业产品设计及开发中的应用范围,使制作精度达到了0.2%。     

Robust guaranteed cost filtering for uncertain timedelay systems with Markovian jumping parameters

1.INTRODUCTION Itisnowwellknownthatstochasticmodelinghas cometoplayanimportantroleinmanybranchesof scienceandindustry.Anareaofparticularinterest hasbeenMarkovjumpsystems[1～5].Ontheother hand,stateestimationplaysanimportantroleinsys temsandcontroltheory,signalprocessingandinforma tionfusion.Certainly,themostwidelyusedestimation methodisthewell knownKalmanfiltering[6,7].Acom monfeatureintheKalmanfilteringisthatanaccurate modelisavailable.Insomeapplications,however,when thesystemissubject…