Optimal predication of double-star position/SINS based on discrete integration

Aiming at Double-Star positioning system's shortcomings of delayed position information and easy exposition of the user as well as the error increase of the SINS with the accumulation of time, the integration of Double-Star positioning system and the SINS is one of the developing directions for an integrated navigation system. This paper puts forward an optimal predication method of Double-Star/SINS integrated system based on discrete integration, which can make use of the delayed position information of Double-Star positioning system to optimally predicate the integrated system, and then corrects the SINS. The experimental results show that this method can increase the user's concealment under the condition of assuring the system's accuracy.     

桥梁技术状况非等间隔序列的灰色预测研究

通过对传统的桥梁缺损状况灰色预测进行改进,提出基于非等间隔序列的灰色预测,解决了在实际桥梁评定中,许多桥梁没有每年评定,或者数据有强烈跳动,数据往往是非等间隔序列的预测问题。     

江西省电力需求预算与邻省的比较研究

本文通过对江西省周边发达省份过去和现在的国民经济发展和能源消费情况的研究,利用横向比较法来校核江西省电量预测的结果和数学模型。     

用自腐蚀电位预测LY12CZ铝合金的腐蚀损伤

研究了ＬＹ１２ＣＺ铝合金在ＥＸＣＯ溶液中的自腐蚀电位和最大腐蚀深度随浸泡时间的变化关系。结果表明,ＬＹ１２ＣＺ铝合金在ＥＸＣＯ溶液中的腐蚀动力学可分为两个阶段,浸泡前期,腐蚀发展较快,但腐蚀动力学的规律性不明显;浸泡后期,腐蚀发展稍慢,腐蚀动力学近似地遵循线性规律。     

滑坡位移监测动态预报时间序列分析技术研究

采用三次样条函数插值法处理非等距时间序列,运用时序分析方法建立了滑坡位移动态预报的ARIMA模型和CAR模型,并将其应用于茅坪滑坡,取得了良好的实际成果,为判断茅坪滑坡的动态特征提供了可靠的理论依据.     

中国水-能源-粮食耦合协调发展实证分析

水、能源、粮食作为3大重要资源,其协调发展是经济社会可持续发展的重要基础。文章首先构建水-能源-粮食（W-E-F）系统的综合评价指标体系,然后采用熵值法和变异系数法对指标赋权,并利用耦合模型度量 W-E-F系统的协调发展水平,最后将其与水-能源、水-粮食和能源-粮食系统对比分析,并基于灰色Verhulst模型预测W-E-F系统2018—2027年的耦合协调度。结果显示：2002—2017年我国W-E-F系统的综合评价指数呈上升趋势;2002—2017年W-E-F系统的耦合度平均为高水平耦合;2002—2017年W-E-F系统的耦合协调经历了过渡、基本协调和高度协调3个阶段,并在2018—2027年将保持优质协调,但能源的发展水平仍滞后于水资源与粮食,因此,需加强能源的开发利用率,以推动经济社会的可持续发展。     

川东北毛坝场构造飞仙关组三段裂缝预测

对川东北毛坝地区的钻井资料进行研究发现,该区飞仙关组三段含气裂缝储层横向上呈不均匀分布,井位设计论证困难较大。通过对该区三维地震资料进行研究,得知该区断层发育,并对飞仙关组三段的裂缝发育有较大影响。飞三段岩性组合也使其容易产生裂缝。对此,首先利用井资料进行岩石物理正演模型研究,得到了飞仙关组三段裂缝含气储层的AVO响应特征;其次基于地震波在地下介质中传播所表现的各向异性,从叠前地震属性随方位角变化关系分析入手,表征和描述了研究区飞仙关组三段裂缝储层的分布特征,以此预测飞仙关组三段裂缝型储层发育情况。裂缝储层预测结果与钻井结果对应较好。     

基于支持向量机理论的地下水水源地动态预测模型

盘锦市盘东地下水水源地是辽河油田工业和生活用水主要水源,长期观测资料分析表明开采量是影响水源地水位动态的主要因素,二者之间存在着显著的相关性。该文在介绍支持向量机基本原理和实现算法的基础上,探讨了如何合理选择核函数,建立支持向量机回归方法水源地水位动态预测模型。通过对比多项式核函数和径向基函数(RBF)核函数的训练和模拟结果,发现后者预测精度高。研究成果表明,相对于传统的回归分析方法,基于支持向量机回归方法的动态模型的模拟预测能力明显提高。该文中的动态模型方法在地下水位动态预测中具有广泛的应用前景。     

Survey of visual sentiment prediction for social media analysis

Recent years have witnessed a rapid spread of multi-modality microblogs like Twitter and Sina Weibo composed of image, text and emoticon. Visual sentiment prediction of such microblog based social media has recently attracted ever-increasing research focus with broad application prospect. In this paper, we give a systematic review of the recent advances and cutting-edge techniques for visual sentiment analysis. To this end, in this paper we review the most recent works in this topic, in which detailed comparison as well as experimental evaluation are given over the cutting-edge methods. We further reveal and discuss the future trends and potential directions for visual sentiment prediction.     

Formation rules of single phase solid solution in high entropy alloys

A new empirical rule to form single phase solid solution structured high entropy alloys was proposed by integrating three dependent parameters, i.e. atomic size difference δ, mixing enthalpy ΔH_mix and valence electron concentration VEC. It was found that the single phase face centred cubic solid solution will form if δ?<?4.27%, ??7.27?kJ?mol^??1?<?ΔH_mix?<?4?kJ?mol^??1 and VEC>8, while the single phase body centred cubic solid solution will form in the case of δ?<?4.27%, ??7.27?kJ?mol^??1?<?ΔH_mix?<?4?kJ?mol^??1 and VEC?<?6.87. This empirical rule was verified by typical high entropy alloys that have been reported.