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1.
ȷ��1���1������ȫ����ˮ���ģ��ʵ�� 总被引：2，自引：0，他引：2
???????????????1???1??(10 -5 ms -2 ??)??????????????????????????????????????????????,????????????????????????1???1??????????????????????????????÷??????????衣 ????????????????????????????????????÷??????1???1??????????????????????????? 相似文献
2.
通过对传统GM(1,1)缺陷分析和改进的基于权的PGM(1,1)建模机理描述,顾及PGM(1,1)中背景值构造时取相同的参数不能充分降低模型的预测误差,对不同的时刻引入不同的参数来改进GM(1,1)背景值序列的计算公式,将这种背景值构造方法和灰元N引入GM(1,1)建立了新的白化方程。在建立的新的白化方程基础上,用龙格-库塔法以修正的初始值计算累加值的模拟序列。针对引入的参数较多问题,采用粒子群算法寻找满足相对误差均值最优的参数,从而建立了基于粒子群优化算法和加权灰色组合的PSO-GM模型。工程实例应用表明,新模型的拟合精度高,预测效果好,相对其他两种原有模型预测精度有明显提高。 相似文献
3.
GPS Block IIR(M)����ԭ�����Ӳ�Ԥ���о� 总被引：3，自引：0，他引：3
?????????????????￡????ú?????????GPS Block IIR??M??????????????????????о??????????GM(1??1)??AR(p)??????????1???????????????1 ns????????10??????????????10 ns??????????????ζ??????GM??1??1???????????????????????IGS(the International GPS Service for Geodynamics)??????????7 ns?????? 相似文献
4.
??о?GM(1,1)???????????????????????????????????????GM(1,1)????????????????Σ?????3′?л???????????????????????????????????RnGM???????????????RnGM????????е????????????GM(1,1)????????????б????????????RnGM???н???????????????????? 相似文献
5.
????GM(1,1)???????????????????о????????????????x(1)(1)??x(1)(n)??????????GM(1,1)??????????????????x(1)(1)??x(1)(n)?GM(1,1)????????????·???????x(1)(t)?????????????????1-AGO???е???????????С?????????????????????????????????????????????????????????????????з?????????????????????????????÷?Χ?????????????????????????????????????GM(1,1)????????????????????GM(1,1)???? 相似文献
6.
????GM(1,1)?????????????????????????????????????????GM(1,1)?????????????????????????GM(1,1) ??????GM(1,1)??PGM(1,1)?????GM(1,1)????????????б???????????????????????GM(1,1)???????????? 相似文献
7.
????и?????????????η????????????????????????С?????????????????????????????????????????????“С??????????”???????????????????????????????????????????????????GM(1,1)??????????????г??????η????????????????????????????????????????????????Ч???????????????е???????????????????????????????????????????????????GM(1,1)???????????????????GM(1,1)??????????????????????η????????????????????????? 相似文献
8.
GM(1,1)预测效果数值试验 总被引：1，自引：0，他引：1
采用不同类型原始数据对传统GM(1，1)进行了预测效果数值试验，然后通过对预测结果及传统GM(1，1)基本思想进行深入分析提出传统GM(1，1)存在的问题，并提出了相应的改进思路。 相似文献
9.
将局部均值分解(LMD)方法应用在监测数据中。实验结果表明,LMD-GM(1,1)模型的拟合效果和预测效果比EMD-GM(1,1)模型和GM(1,1)模型好,具有更高的应用价值。 相似文献
10.
????RAMP DEM?????????????п??????ERS??1????????????????????????????????λ????????????????????????????????λ?????????????????????????????????? 相似文献
11.
?????????????????????????????????????????????????????????S??L????????????????????S??L/K???????????????????з??????????????о?????????????????????????????1??????????????????????????????????о??????????????????????????????????????????????????????????????????????????????????й??????????????????????????y?С???????1??????????? 相似文献
12.
Stephen H. Ewart 《中国海洋大学学报(英文版)》2012,11(2):205-212
To explore the polysaccharides from selected seaweeds of Atlantic Canada and to evaluate their potential anti-influenza virus activities, polysaccharides were isolated from several Atlantic Canadian seaweeds, including three red algae (Polysiphonia lanosa, Furcellaria lumbricalis, and Palmaria palmata), two brown algae (Ascophyllum nodosum and Fucus vesiculosus), and one green alga (Ulva lactuca) by sequential extraction with cold water, hot water, and alkali solutions. These polysaccharides were ana-lyzed for monosaccharide composition and other general chemical properties, and they were evaluated for anti-influenza virus activities. Total sugar contents in these polysaccharides ranged from 15.4% (in U. lactuca) to 91.4% (in F. lumbricalis); sulfation level was as high as 17.6% in a polysaccharide from U. lactuca, whereas it could not be detected in an alikali-extract from P. palmaria. For polysaccharides from red seaweeds, the main sugar units were sulfated galactans (agar or carrageenan) for P. lanosa, F. lumbricalis, and xylans for P. palmata. In brown seaweeds, the polysaccharides largely contained sulfated fucans, whereas the polysaccharides in green seaweed were mainly composed of heteroglycuronans. Screening for antiviral activity against influenza A/PR/8/34 (H1N1) virus revealed that brown algal polysaccharides were particularly effective. Seaweeds from Atlantic Canada are a good source of marine polysaccharides with potential antiviral properties. 相似文献
13.
根据建筑物的沉降变形特征 ,引用GM (1,1)建模思想来建立沉降预测模型。利用较少的前期观测数据建立模型来预测建筑物最终沉降量 ,然后据此判断其是否满足建筑物的变形要求 ,以便较早地提出工程防治措施。 相似文献
14.
Structure and anti-influenza A (H1N1) virus activity of three polysaccharides from Eucheuma denticulatum 总被引：1，自引：0，他引：1
YU Guangli LI Miaomiao WANG Wei LIU Xin ZHAO Xiaoliang LV Youjing LI Guangsheng JIAO Guangling ZHAO Xia 《中国海洋大学学报(英文版)》2012,11(4):527-532
Three polysaccharides(EW,EH and EA) were prepared from a red alga Eucheuma denticulatum by sequential extraction with cold water,hot water and sodium hydroxide water solution.Their monosaccharide compositions,relative molecular mass and structural characterization were determined by gas chromatography,high performance 1iquid chromatography,fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy methods.EW was hybrid ι/κ/ν-carrageenan(70 ι/17κ/13ν-carrabiose),EH was mainly ι-carrageenan,and EA was mainly α-1,4-Glucan(88%) but mixed with small amount of ι-carrageenan(12%).The relative molecular mass of EW,EH and EA was 480,580 and 510 kDa,respectively.The anti-influenza A(H1N1) virus activity of these three polysaccharides was evaluated using the Madin-Darby canine kidney cells model.EW showed good anti-H1N1 virus activity,its IC 50 was 276.5 μg mL-1,and the inhibition rate to H1N1 virus was 52% when its concentration was 250 μg mL-1.The IC 50 of ι-carrageenan EH was 366.4 μg mL-1,whereas EA showed lower anti-H1N1 virus activity(IC 50 >430 μg mL-1).Available data obtained give positive evidence that the hybrid carrageenan EW from Eucheuma denticulatum can be used as potential anti-H1N1 virus inhibitor in future. 相似文献
15.
????????GM??1,1???в?????????GMRCFS ???????????????????1998-06-10-11-28??5??GPS ??????α??????????????????GM??1,1???в??????н???????????????????????????α???????? 相似文献
17.
陈鹏宇 《大地测量与地球动力学》2017,37(7):709-714
针对非等距沉降数据序列的建模问题,探讨了3种非等距GM(1,1)模型在沉降预测中的应用。结果显示,加权非等距GM(1,1)模型不适用于具有近似指数趋势的沉降数据,灰线性加权非等距GM(1,1)模型并非真正的非等距模型,模型预测式与时间无关,不能用于沉降预测,而对于笔者所建立的非等距GM(1,1)模型,其拟合函数等同于灰色线性回归组合模型,可用于近似指数趋势的沉降数据。通过实例分析对比了3种非等距GM(1,1)模型的应用效果,验证了上述观点的正确性。 相似文献
18.
省级基础测绘1：1万比例尺数字测绘产品包括DEM，DOM，DLG，DRG、元数据、文档簿等。为验证数字测绘产品最终成果的精度和可靠性，可选择多种方案进行质量检验；在选择检验方案时，既要考虑检验的成本、周期，又要考虑检验方案的科学性和严密性。针对不同的数字测绘产品，该文给出了与之相适应的检验方法，并阐明了检验内容和注意事项。 相似文献
19.
分析了山东省1：1万基础地理信息数据库更新现状,阐述了1：1万基础地理信息数据库及时更新的作业方法、主要更新内容、技术路线,提出了及时更新质量保证体系及质量控制方法,从基础资料的获取与收集,变化要素属性信息的分析确定,矢量要素采集、更新的精度,矢量要素采集的方向,矢量要素采集、更新的完整性,矢量要素采集、更新的现势性,属性项赋值的正确、完整性,更新后要素的逻辑一致性等几个方面,阐述了生产作业中需要注意的环节,分析了产生质量问题的原因,并结合实际工作经验,提出了保障产品质量的几点建议。 相似文献