城市原生污水冷热源圆管紊流换热特性

城市原生污水是一种可再生性清洁能源,流动换热特性是其作为冷热源应用的关键性问题.将污水视为均质单项非牛顿幂律流,分析圆管速度、温度分布,为推导污水流动换热准则关联式,定义非牛顿流的特征黏度、特征雷诺数、广义普朗特数,基于紊流边界层三模式结构,得到换热准则关联式,对比理论与实验曲线.以特征雷诺准则、广义普朗特表示的努谢尔特数具有普遍意义,理论与实验曲线吻合.     

Single channel blind source separation based on ICA feature extraction

A new technique is proposed to solve the blind source separation (BSS) given only a single channel observation. The basis functions and the density of the coefficients of source signals learned by ICA are used as the prior knowledge. Based on the learned prior information the learning rules of single channel BSS are presented by maximizing the joint log likelihood of the mixed sources to obtain source signals from single observation, in which the posterior density of the given measurements is maximized. The experimental results exhibit a successful separation performance for mixtures of speech and music signals.     

制浆蒸煮过程卡伯值测定的研究

采用RBF-CSR方法测定卡伯值，CSR方法将从自变量参数矩阵和因变量向量中提取成分，循环地构造并扩张Krylov子空间，且以此作为源空间，运用最小二乘淮则解得映射到因变量实空间的线性泛函。整个求解过程包括了最小二乘回归（LSR），主成分回归（PCR），偏最小二乘回归（PLS）及其他中间回归方法。然后由预报能力的强弱，从中确定最佳回归模型。通过实验表明，采用该方法测定制浆蒸煮过程卡伯值，效果良好。     

基于VB 6.0的注射模型腔数目优化设计

在WinXP平台下,利用VB 6.0优化设计了塑料注射模的型腔数目,包括系统整体设计、用户界面设计、程序代码编写、数据库的创建和加载、型腔数目的优化方案和系统的测试及编译.经实例验证,该系统界面友好,操作简单,运行正确,稳定可靠,实用性强.     

广义映射混沌扩频序列的保密性分析

从研究混沌序列的保密性角度出发,分析了广义映射混沌序列的抵御预测能力,并用Volterra滤波器对序列进行预测.研究结果表明,广义映射混沌扩频序列具有理想的保密性,适合在保密通信中应用.     

不同条件对糙米发芽过程中微生物数量的影响

为了确定安全食用的发芽糙米生产方法,在不同温度和不同的发芽方法下,对不清洗和定时清洗的糙米进行微生物检测.结果表明,采用浸泡发芽法和密闭气相发芽法时,温度越高.发芽时间越长,细菌总数越多,定时清洗只能适当减少微生物的数量,如密闭气相发芽法,25℃、48h,不定时清洗的样品细菌总数达到2.43×10~8cfu/g,定时清洗的样品细菌总数为1.31 × 10~8cfu/g.而流动水相发芽法的样品细菌总数仅为6.5 × 10~3cfu/g,远低于其他两种发芽方法.因此,相对于传统发芽法,流动水相法是较为安全的发芽方法.     

基于 LoRa 的森林消防协同定位算法

为解决野外火场救援消防员定位安全问题,提出一种基于远距离无线电(LoRa) 技术的森林消防协同定位算法。针对 野外救援存在的非视距(NLOS) 问题,提出一种修正协方差矩阵的扩展卡尔曼滤波协同定位算法,利用LoRa协同网络内部移 动节点之间的测距信息辅助定位,建立系统方程并根据当前时刻的状态滤波值二次更新误差协方差修正偏离误差;其次提出 改进的动态中值滤波算法,采用动态窗口筛选处理定位扰动数据,二次优化定位轨迹曲线。仿真实验结果表明,所提算法极 大地协同了整个网络资源,在室外多NLOS, 通信质量差的环境下定位精度可达0.49 m, 为森林消防安全解救提供了一种可 靠的解决方案。     

蒸煮过程纸浆卡伯值近红外光谱法在线测定

利用近红外光谱法测量蒸煮过程黑液中木素含量的变化，从而在线测定出纸浆卡伯值。通过一元线性回归、多元线性回归和主成分回归分析显示：3种测量模型均具有较好的学习和预测精度，其中主成分回归模型具有较高的预测鲁棒性。     

Identification of Small Regions of Overlap from Copy Number Variable Regions in Patients with Hypospadias

Hypospadias is a common form of congenital atypical sex development that is often associated with other congenital comorbidities. Many genes have been associated with the condition, most commonly single sequence variations. Further investigations of recurrent and overlapping copy number variations (CNVs) have resulted in the identification of genes and chromosome regions associated with various conditions, including differences of sex development (DSD). In this retrospective study, we investigated the DECIPHER database, as well as an internal institutional database, to identify small recurrent CNVs among individuals with isolated and syndromic hypospadias. We further investigated these overlapping recurrent CNVs to identify 75 smallest regions of overlap (SROs) on 18 chromosomes. Some of the genes within these SROs may be considered potential candidate genes for the etiology of hypospadias and, occasionally, additional comorbid phenotypes. This study also investigates for the first time additional common phenotypes among individuals with hypospadias and overlapping CNVs. This study provides data that may aid genetic counseling and management of individuals with hypospadias, as well as improve understanding of its underlying genetic etiology and human genital development overall.     

深度脱木素技术及其己烯糖醛酸的影响

对造纸原料半纤维素的成分和蒸煮方式进行分析,发现聚木糖的侧链基团4-O-甲基葡萄糖醛酸在硫酸盐法蒸煮过程中受到高温强碱的作用生成己烯糖醛酸。阐明己烯糖醛酸在造纸中对卡伯值、漂白、返黄等方面的不利影响,分析不同深度脱木素技术对己烯糖醛酸含量的影响,为提高纸浆质量提供依据。