基于线性神经网络的重庆市GDP发展研究

对1978-2011年重庆市生产总值时间序列进行分析,研究发现四阶差分之后,数据趋于平稳;四阶差分序列的自相关系数一阶截尾,最终建立时间序列ARIMA（1,4,1）模型,并测算残差平方和,但ARIMA模型的残差序列存在自相关,对拟合效果产生了影响;基于时间序列ARIMA（1,4,1）模型研究的基础,进一步采用线性神经网络对序列进行学习和仿真计算,结果表明：神经网络的模拟效果优于ARIMA时间序列的模拟效果.     

中国人口数量的时间序列分析

本文运用时间序列模型（ARIMA模型）对中国人口进行分析与预测,应用Eviews6．0软件对1949～2007年中国人口数据进行拟合,建立ARIMA模型,运用2008～2010年的人口数据来验证模型,并对2011年的总人口数进行了预测。     

基于ARIMA、BP神经网络与GM的组合模型

为了提高预测模型的精度,给出了一种新的组合预测模型.利用时间序列ARIMA预测模型、BP神经网络及GM灰色预测模型进行单一模型的拟合与预测,通过赋予适当权系数结合三种方法得到了新的组合预测模型.山西省人均GDP预测实例应用结果表明:组合预测模型很好地描述了山西省人均GDP的非线性发展,比单一预测方法具有更高的预测精度.组合模型发挥了这三种模型各自的优势,可以作为人均GDP预测的有效方法,该模型在时间序列的预测中是有效的.     

混合时间序列模型在经济增长预测中的应用

把趋势外推模型和ARIMA模型结合起来可构建混合时间序列这一新的预测模型.利用该模型,并以1978~2000年我国GDP总量数据为依据,通过Eviews5.0软件对模型进行估计,并根据建立的新模型对2001~2004年GDP总量作预测效果检验.结果表明,通过混合时间序列模型实施预测,误差相对较小,效果更好.     

基于ARIMA模型的安徽省城乡收入差距的预测

根据1978²012年安徽省城乡居民收入的时间序列数据,运用ARIMA模型,用SAS软件进行拟合,对安徽省城乡居民收入差距情况进行分析,给出了20132012年安徽省城乡居民收入的时间序列数据,运用ARIMA模型,用SAS软件进行拟合,对安徽省城乡居民收入差距情况进行分析,给出了2013²015年安徽省城乡居民绝对收入差距的预测值。结果显示城乡居民收入差距会继续扩大。     

基于时间序列疏系数模型的太阳辐射年际变化趋势预测

利用1961—2016年山东省济南市太阳年总辐射量观测数据,通过模型识别和统计检验,对比分析时间序列模型AR(5)和ARIMA((1,2,4),1,0)的拟合结果。残差检验结果表明,疏系数模型ARIMA ((1,2,4),1,0)可用于预测地表太阳年总辐射量,预测结果显示2017—2025年济南市地表太阳辐射的年际变化整体呈增长趋势。对比多元线性回归模型结果,时间序列疏系数模型误差较小,预测准确度相对较高。     

基于ARIMA模型的福州市雷暴日趋势分析

在分析ARIMA(p,d,q)预测模型的基础上,以福州市1961-2006年的雷暴日为时间序列基础,通过对该序列进行平稳性分析、差分处理、自相关、偏自相关系数计算与绘图、ARIMA建模、参数估计、假设检验及模型预测,将ARIMA模型运用在雷暴日的趋势分析上.研究结果表明,ARIMA能很好地拟合计算出未来短时段内的数据,...     

湖北省1999-2008年生态足迹动态测度与分析

运用生态足迹的理论和模型,对湖北省1999-2008年的生态足迹、生态承载力和万元GDP生态足迹进行了时间序列测度.计算结果表明:在这10年里,湖北省人均生态足迹、人均生态承载力以及GDP持有量一直在增加,但人均生态足迹的增长趋势远大于人均生态承载力;万元GDP生态足迹则一直呈现下降趋势.总体来说,湖北省1999-20...     

时间序列在湖南省GDP预测中的应用——基于ARIMA模型

通过选取1978～2017年湖南省国内生产总值的相关数据,运用计量经济软件Eviews8对选取的时间序列数据进行模型的建立。再经过相对误差分析和所建Holter-Winter非季节短期预测模型的对比,最终确定建立ARIMA(1,1,2)最优模型来对湖南省GDP进行预测。研究发现,湖南省将在2020年达到全面建成小康社会并人均生产总值将超过一万美元,由此为今后湖南省决策机构制订宏观调控目标与进行经济决策时提供参考。     

时间序列模型在婴儿潮分析中的应用

本文利用时间序列分析线性模型中求和自回归移动平均模型(ARIMA)和统计学软件SPSS,选用1947-2014年新生儿人口数据为参考数据序列,通过参数检验与残差分析验证ARIMA模型在人口预测分析上的可靠性.模型的拟合与实证分析说明时间序列分析在人口预测问题上的有效性,可对中国婴儿潮做短期预测.本文还对2015年到2030年新生儿人口数进行统计分析,预测第四次婴儿潮的到来.这将给社会计划生育、教育、交通等方面提供重要参考数据.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.