基于生态防护的航道疏浚工程探讨

文章从航道疏浚工程对生态环境的影响入手,在阐述生态防护的基本内涵的基础上,提出在航道疏浚工程中应用生态防护技术,加强生态环境保护的具体措施。     

蒙古栎萌发种子空间分布的分数维分析

从地统计学角度,应用半方差维数对蒙古栎萌发的种子分布格局进行分析,结果表明：自然条件下蒙古栎的发芽率很高,幼苗难以越冬;在样地内,萌发的蒙古栎种子分布极不均匀,但在不同尺度下,半方差维数为1．820,其空间分布具有空间异质性．     

公共数字文化建设中云存储架构应用研究

公共数字文化建设要求对海量数字化信息进行快速、经济的存储与管理。通过对现有云存储开源工具的综合比较分析,提出了一种基于开源软件工具的采用混合云存储技术的文件管理服务架构方案,并对方案设计实施的详细过程与关键因素进行了细致的说明,初步的实验结果表明了方案的实用性与有效性。     

基于联系数的多属性决策模型

针对权重为区间数且属性值为实数和区间数相混合的多属性决策问题,提出了基于联系数的多属性决策模型.该模型将区间型权重、实数型及区间型属性值转化成联系数的形式,利用联系数的运算规则确定决策方案的排序.该方法集确定与不确定分析为一体,反映了不确定性对结果的影响,所需计算量较少,便于应用.实例分析验证了该方法的有效性和实用性.     

民机客舱热载荷的数值计算

以桌型客机为例,将客舱复杂围护结构划分为三部分。据此建立各区域单元结构的三维数值计算模型,并对不同外界环境下客舱的热流密度及传热量进行了数值仿真。结果与传统计算方法吻合良好,研究工作对于我国大型飞机热载荷的计算具有参考价值。     

Common variants on 8p12 and 1q24.2 confer risk of schizophrenia

Schizophrenia is a severe mental disorder affecting ～1% of the world population, with heritability of up to 80%. To identify new common genetic risk factors, we performed a genome-wide association study (GWAS) in the Han Chinese population. The discovery sample set consisted of 3,750 individuals with schizophrenia and 6,468 healthy controls (1,578 cases and 1,592 controls from northern Han Chinese, 1,238 cases and 2,856 controls from central Han Chinese, and 934 cases and 2,020 controls from the southern Han Chinese). We further analyzed the strongest association signals in an additional independent cohort of 4,383 cases and 4,539 controls from the Han Chinese population. Meta-analysis identified common SNPs that associated with schizophrenia with genome-wide significance on 8p12 (rs16887244, P = 1.27 × 10(-10)) and 1q24.2 (rs10489202, P = 9.50 × 10(-9)). Our findings provide new insights into the pathogenesis of schizophrenia.     

Q-Learning-Based Target Selection for Bearings-Only Autonomous Navigation

This paper presents a Q-learning-based target selection algorithm for spacecraft autonomous navigation using bearing observations of known visible targets. For the considered navigation system,the position and velocity of the spacecraft are estimated using an extended Kalman filter(EKF) with the measurements of inter-satellite line-of-sight(LOS) vectors obtained via an onboard star camera.This paper focuses on the selection of the appropriate target at each observation period for the star camera adaptively, such that the performance of the EKF is enhanced. To derive an effective algorithm,a Q-function is designed to select a proper observation region, while a U-function is introduced to rank the targets in the selected region. Both the Q-function and the U-function are constructed based on the sequence of innovations obtained from the EKF. The efficiency of the Q-learning-based target selection algorithm is illustrated via numerical simulations, which show that the presented algorithm outperforms the traditional target selection strategy based on a Cramer-Rao bound(CRB) in the case that the prior knowledge about the target location is inaccurate.     

一类带非线性边界条件的抛物型方程组解的整体存在及爆破

本文研究了一类带有非线性边界条件的抛物型方程组解的整体存在及有限时刻爆破问题.通过构造方程组的上下解,得到了解整体存在的一个充分条件及解在有限时刻爆破的一个充分条件.     

萍乡城关话音系与普通话音系的比较

本文是萍乡方言语音研究系列论文之一。通过对萍乡城关话音系与普通话音系的比较,揭示萍乡城关话的语音特点,找出其与普通话语音之间的对应关系。     

大同煤田煌斑岩在地震和测井资料上的响应特征

通过对大同煤田煌斑岩侵入类型及其在煤田测井和地震资料的响应特征的分析研究,提出了利用大同煤田煌斑岩侵入煤层的物性特征来划定其影响范围的方法,为今后煤田的资源评价和可采起到一定的指导作用,也具有一定的现实意义。