Heterogeneous feature ensemble modeling with stochastic configuration networks for predicting furnace temperature of a municipal solid waste incineration process

Neural Computing and Applications - Considering the accuracy, generalization ability, stability, and training efficiency of a furnace temperature model in the process of municipal solid waste...     

On impulsive modes of linear singular systems subject to decentralized output feedback

Some algebraic properties of linear singular systems at infinity under static decentralized output feedback are studied in this note. New concepts of algebraic multiplicity and geometric multiplicity of the impulsive decentralized fixed modes, and the impulsive decentralized cycle index of the singular system are defined. These concepts indicate how much a singular system can be made close to being impulse-free by decentralized output feedback, and the results are shown to be generic. The geometric multiplicity and the impulsive decentralized cycle index are determined in terms of the system matrices explicitly. The number of impulsive modes that can be eliminated is given in terms of these indexes. The impulsive decentralized cycle index is shown to characterize generic properties on controllability and observability of the closed-loop system through an individual channel (or an external channel). Illustrative examples are provided.     

用神经网络综合预测水力旋流器性能

将人工神经网络用作水力旋流器的性能预测模型，实现了对其性能的全面预测，并探讨了结构及工艺参数对其性能的综合影响，弥补了以往数学模型预测的某些不足，为水力旋流器性能的综合预测提出了一个有效而简单的新手段。     

一种铂电阻测温电路的非线性校正方法

为克服铂电阻温度传感器的非线性带来的误差,在对铂电阻的非线性特性研究的基础上,设计了以恒流源非平衡电桥为基础的测温电路来代替传统的测温电桥.同时,采用分段最小二乘法拟合反向分度函数,以减小铂电阻自身的非线性带来的测量误差.最后给出基于stm32f103vbt6微控制器测温系统的实验结果,结果表明,铂电阻的非线性误差在0.03%以内,测温误差在0.25℃,满足大多数场合需要.     

人工材料价格对天然气钻井投资的影响及其控制措施

中国石油天然气股份有限公司钻井投资占天然气勘探开发总投资的70%左右,其中人工费和材料费占天然气钻井总投资的60%以上。2000年以来钻井人工、材料价格平均增幅超过80%,部分钻井成本增幅超过1倍。为此,采用理论计算和因素分析法,根据该公司典型井设计参数、天然气井计价标准建立了天然气钻井周期、套管材料消耗量等5个计算模型,以及人工、材料价格变化对钻井投资的影响程度和投资估算指标等3个计算模型。计算结果显示,该公司“十一五”期间柴油价格上升60%导致天然气钻井投资增加6%。最后提出了优化工程设计、鼓励总承包机制、物资采购招标等3项控制天然气钻井投资措施,为合理确定和有效控制钻井投资提供了依据。     

用户协作模式下自适应情境的LBS隐私保护方法

针对当前LBS(located-based service)应用中位置隐私保护方法难以实现隐私保护度与服务质量平衡的问题,提出了一种基于用户协作的自适应情境的位置隐私保护方法:移动用户消费LBS服务时,需从服务提供商处实时下载“粗糙化”的路网数据,并以此为基础,通过情境感知自主模糊个人真实位置,然后选择具有互助意愿的代理用户进行自适应情境的增量近邻查询.为了提高系统的服务质量,引入通讯成本估算方法确定查询点位置,并采用Voronoi图技术过滤代理用户的查询结果,从而减少系统通讯开销.不仅从理论上分析了该方法的隐私保护度与自适应性,而且对方法性能进行了实验与比较,实验结果表明:该方法较SpaceTwist算法具有更高的性能优势,实现了隐私保护度与服务质量的平衡.     

湖北大冶鸡冠嘴金矿岩溶塌陷成因分析

本文以矿区工程实例为基础提出了三种岩溶塌陷的盖层地质概化模型．并对每一种模型的致塌机制进行了分析。提出了综合防治措施。     

Enhancement of urea uptake in Chinese rice wine yeast strain N85 by the constitutive expression of DUR3 for ethyl carbamate elimination

Most of the fermented alcoholic beverages, particularly Chinese rice wine, contain the potentially human carcinogenic compound ethyl carbamate (EC). As a major EC precursor in Chinese rice wine, urea in fermentations can be transported into the yeast cell by urea permease and finally metabolized by urea carboxylase and allophanate hydrolase in vivo. To eliminate EC in Chinese rice wines, the present study constructed high urea uptake yeast strains N1‐D, N2‐D and N‐D, by introducing a strong promoter (PGK1p) into the urea permease gene (DUR3) of the industrial Chinese rice wine yeast N85, and by the restoration of the URA3 gene at the same time. With these self‐cloned, high urea uptake strains, the urea and EC in the terminal Chinese rice wine samples were reduced to different extents. With two copies of overexpressed DUR3, the N‐D strain could reduce the urea and the EC by 53.4 and 26.1%, respectively. No difference in fermentation characteristics was found between the engineered strains and the parental industrial yeast strain N85. These results could help to optimize the genetic manipulation strategy for EC elimination in Chinese rice wine production. Copyright © 2015 The Institute of Brewing & Distilling     

图像目标类别检测综述

随着移动设备与社交网络的迅速发展,数字图像的数据规模急剧增加,图像目标类别检测已经发展成为目前计算机视觉领域内的一个研究热点。对图像目标类别检测的关键问题进行了综述。首先对目标类别检测的研究背景进行了介绍;然后对目标类别检测技术进行了综述,其中包括外观模型、分类器和定位策略3个核心技术,以及数据集和评价标准;最后列出了目前目标类别检测算法的测试结果,并总结了目标类别检测的主要研究难点和发展方向。