基于神经-模糊方法的单料烟感官质量评价专家系统   总被引：3，自引：0，他引：3  

林丽莉  冯天瑾  周文晖  郑宏伟 《中国海洋大学学报(自然科学版)》2001,31(6):931-936

作者通过对单料烟评吸的结果与理化测定的指标参数进行分析 ,结合专家经验并采用神经 -模糊方法 ,提出一种基于单料烟的理化指标对各感官参数进行分类、分级 ,建造单料烟感官质量评价专家系统的方法。实验表明 ,该系统具有学习与知识提取能力 ,在卷烟产品质量管理新产品开发中具有指导意义  相似文献   

Study on Flow Field Around Vertical Breakwater Under Different Overtopping Conditions Based on Numerical Simulation     

蒋学炼  吴米玲  李炎保 《中国海洋工程》2010,(4)

A numerical wave flume is constructed based on the Reynolds Averaged Navier-Stokes (RANS) equations with turbulence closure by a modified k-ε model to study the viscous interactions of waves with vertical breakwaters for different overtopping cases. The governing equations,the turbulence model,boundary conditions,and solution method for the numerical wave flume are introduced briefly. The reliability of the numerical wave flume is examined by comparing the numerical results with the experimental measurement...  相似文献   

The Ground Deformation Disaster in the City of Tianjin Associated with the Tangshan Earthquake     

Huang Liren  Zhao Chengkun  Hu Huimmg  Yang Guiye  Cao XiangchunFirst Land Deformation Monitoring Center  SSB  Tianjin  China Surveying  Mapping Bureau of Tianjin Municipality  Tianjin  China 《中国地震研究》1994,(3)

In this paper,a study of the principal characteristics of the ground deformation disasters in the city of Tianjin caused by the Tangshan earthquake is based on the results from the recent remeasurements of the geodetic controlling network of Tianjin and from on-site investigations after the earthquake.These results show that only the ground deformation in the Ninghe and Hangu areas near the epicenter reflect directly the co-seismic crustal stress,while the serious ground deformation and the engineering earthquake damages in the urban districts of Tianjin are controlled to a great extent by the local engineering geological structures,showing a kind of secondary disaster.Several suggestions are also proposed in the paper concerning the counter-measures for reducing the earthquake damage in big cities.  相似文献   

SETTLING PROPERTIES OF COHESIVE AND NON-COHESIVE PARTICULATE MIXTURES IN WATER     

Xia Zhenhuan. Professor  Dept. Hydraulic Engineering. Tsinshua University.  Song Genpei. Lecturer. kept. Hydraulic Engineering. Tsinghua University.  Chen Yiping. Assistant. Dept. Hydraulic Engineerins  Tsomghua University  Wang Gang. Engineer. Research institute of Naval Engineering. PLA 《国际泥沙研究》1990,(1)

1. INTRODUCTIONAs a wide range of size distirbution including usually a certain POrtion of cohesive material is thecommon feature of the sediment constituting hyperconcentrated flows. it is desirable to study the settling properties of mixtures of cohesive and non--cohesjve sediment particles at high concentrations.Past studies on the settling of discrete particles in a suspension of fine cohesjve sediment is scarcein the literature. The Sediment Research Laboratory of Tsinghua Universi…  相似文献   

矿床模拟法在辽宁清原金矿资源预测中的应用          下载免费PDF全文

李俊建  沈保丰  骆辉  韩国刚 《地质找矿论丛》1990,5(2):76-84

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A NUMERICAL MODEL FOR SEDIMENTATION IN FENHE RESERVOIR AND THE ADJOINING REACHES     

GUAN Yiexiang  RONG Fengtao  WANG Jingxin  YIN Lisheng  WANG Hongtu Project Engineer  Hydraulic Research Institute  Shanxi Province  China  Vice Chief Engineer  Senior Engineer  Water Resources 《国际泥沙研究》1991,(1)

In this paper, a numerical model for sedimentation in Fenhe Reservoir and the adjoining reaches has been presented on the basis of the theory of non-equilibrium sediment transport. The model is calibrated by using a part of the sediment data collected for Fenhe Reservoir and checked by simulating the remaining data. Moreover, the method of optimization in nonlinear programming has been applied to determine the basic parameters of the model applying a concept of fuzzy mathematics to formulate the objective functions. The computed amounts of reservoir deposition and channel deformation arc found to be substantially in agreement with the values observed.  相似文献   

模糊数学方法在分析日本东海地区地震前兆中的应用     

冯德益  市川政治 《地震研究》1989,12(4):360-369

本文把模糊模式识别的直接方法用于检测日本东海地区地震活动性、体积应变、地下水位、地下水氡含量、地倾斜和潮位中的前兆变化。此方法可消除诸如降雨和气温变化等干扰,使我们能更清晰地识别出地震前兆。此外,还把模糊相似方法和模糊聚类方法应用于识别地震空区及检验地震活动随时间变化的相似性。上述方法在日本其他地区同样有效,即将编入日本气象研究所板内地震预报计划中的计算机系统内。  相似文献   

海城7．3级地震前地震波动力学特征量的异常变化   总被引：1，自引：0，他引：1  

冯德益  顾瑾平  陈化然  郭瑞芝  杨彩霞 《东北地震研究》1995,(4)

本文给出对海城７．３级地震前地震波动力学特征量变化的一些最新研究结果。所研究的地震波包括体波（Ｐ，Ｓ波）、尾波和短周期地脉动三类。特征量有：体波与地脉动的波形时间线性度和空间线性度，平均半周期，频谱的峰值频率、拐角频率、相对频带宽度、相对频谱峰值、高频段的谱线斜率绝对值；尾波的时间熵、振幅比、持续时间、观测与计算持续时间差及其二阶差分、Ｑ＿ｃ值、反映介质混浊度与震源特性的系数ａ＿ｃ等。所得结果表明，三类地震波的上述动力学特征量大都在震前一至半年左右出现、有的在６－１０天乃至一天以内出现过不同形态的阶段性异常变化，因而可看作海城地震的中短期和临震的地震波前兆异常指标。  相似文献   

Towards evaluating cloud response to climate change using clustering technique identification of cloud regimes     

Keith D. Williams  Catherine A. Senior  Anthony Slingo  John F. B. Mitchell 《Climate Dynamics》2005,24(7-8):701-719

Most of the discrepancies in the climate sensitivity of general circulation models (GCMs) are believed to be due to differences in cloud radiative feedback. Analysis of cloud response to climate change in different ‘regimes’ may offer a more detailed understanding of how the cloud response differs between GCMs. In which case, evaluation of simulated cloud regimes against observations in terms of both their cloud properties and frequency of occurrence will assist in assessing confidence in the cloud response to climate change in a particular GCM. In this study, we use a clustering technique on International Satellite Cloud Climatology Project (ISCCP) data and on ISCCP-like diagnostics from two versions of the Hadley Centre GCM to identify cloud regimes over four different geographical regions. The two versions of the model are evaluated against observational data and their cloud response to climate change compared within the cloud regime framework. It is found that cloud clusters produced by the more recent GCM, HadSM4, compare more favourably with observations than HadSM3. In response to climate change, although the net cloud response over particular regions is often different in the two models, in several instances the same basic processes may be seen to be operating. Overall, both changes in the frequency of occurrence of cloud regimes and changes in the properties (optical depth and cloud top height) of the cloud regimes contribute to the cloud response to climate change.  相似文献   

燕山地区土城子组划分、时代与盆地性质探讨   总被引：13，自引：2，他引：13       下载免费PDF全文

孙立新  赵凤清  王惠初  谷永昌  冀世平 《地质学报》2007,81(4):445-454

燕山地区土城子组分布广泛,顶底清晰,是本区最具特色的岩石地层单位之一。区域地质对比研究表明,燕山西部土城子组与燕山中东部土城子组在地层、时代上有较大的不同,西部盆地中髫髻山组火山岩不发育或很少发育,土城子组在地层划分上常包含九龙山组或髫髻山期火山岩,时代为中晚侏罗世(J2—J3);东部盆地普遍发育髫髻山组火山岩浆或火山-沉积地层,土城子组划分与层型剖面一致。古生物化石和同位素年龄研究表明:土城子组时限在156~139Ma之间,属于晚侏罗世—早白垩世。土城子期盆地沉积的不对称性,相分布特征,古水流等指示其形成在一个挤压作用下的陆内火山-沉积盆地环境。  相似文献