基于Heatmap的地理对象空间分布热度计算方法

为了更加直观地表达地理对象某一特征空间分布态势,研究Heatmap现有的计算方法,并对其进行改进形成快速生成Heatmap的方法,用来直观表达地理对象某特征的空间态势;然后利用全国居民小区价格热度分布实例验证利用Heatmap进行空间分布热度计算方法的可行性。试验表明本文提出的方法能有效直观地反映地理对象的空间分布态势,为人们工作生活中的重要决策提供依据。

混合挂号模式下基于专家热度的号源分配研究

目的:在混合挂号模式下,进一步促进医疗资源的合理使用。方法:从挂号难的角度分析了混合挂号模式存在的合理性,定义专家热度并据此提出一种调整专家预约挂号和现场挂号号源数量的方法。结果:利用2019年1—3月份某医院某类门诊号源的挂号数据,展示了根据热度进行号源调整的过程。结论:通过增加热度较低专家的预约号源数量,减少预约患者候诊时长,同时降低热度较高专家的预约号源数量,为疑难杂症患者保留更多现场号源,降低挂号难度。该方法为如何确定各专家不同种类号源数量提供了决策支持。

网络热点事件发现系统的设计

该文设计了一个热点事件发现系统。该系统面向互联网新闻报道流,能自动发现任意一段时间内网络上的热点事件,并给出描述事件发展过程的曲线图。针对网络新闻语料具有数据规模大和时间特征明显两个特性,系统将语料按时间(天)分组,对每天的语料采用凝聚聚类得到微类,选取某段时间内的所有微类,再做Single-pass聚类得到事件列表,利用事件热度计算公式,把候选事件按热度进行排序。采用该系统对2007年新闻语料进行实验,结果表明该系统能取得较好的效果。

基于实时词共现网络的微博话题发现

针对微博的实时性、稀疏性和海量性特点,提出基于实时词共现网络的话题发现模型。首先,从原始语料中筛选出主题词集合,再利用时间参数计算共现主题词的关系权重以实现词共现网络的构建,通过该网络推算出与话题关联性强的潜在特征词以解决微博特征词的稀疏性;其次,采用改进Single-Pass算法实现话题增量聚类;最后,对每个话题的主题词按热度计算进行排序,获得最具代表性的话题主题词。实验结果表明,该模型与经典Single-Pass聚类算法相比,话题发现准确率约提高6%,综合指标提高8%。实验结果证明所提模型的有效性和准确性。

基于农业网络信息分类的热词自动提取方法

热词提取对于监控和分析农业舆情具有重要意义,目前已有一定研究基础,但仍存在针对性差等问题,无法满足农业领域不同产业用户群的个性化需求,为此,提出一种基于农业网络信息分类的热词自动提取方法。首先采用多标记分类算法对文本语料进行分类,按分类类别构建语料库,然后采用基于信息熵的方法对每个类别分别提取热词候选词,最后采用基于时间变化的方法进行候选词热度计算,根据候选词热度排序结果得到热词。本文抽取农业网站上的15 354条文本进行实验,结果表明,热词提取准确率达到0.9以上,能够较高质量地提取农业热词,为不同农业用户群体发现和分析产业热点提供帮助。

数据挖掘的网络热点话题演化动态预测

为了及时发现网络热点话题走向,提出基于数据挖掘技术的网络热点话题演化动态预测算法。首先运用基于块的单遍聚类算法,将网络热点话题划分成不同文本集,根据特征划分到不同块中,进行网络热点话题的数据挖掘,然后计算页面话题热度值,利用热度值描述报道获得的先后顺序,判断能否产生新的网络热点话题,实现网络热点话题预测。经实验验证算法网络热点话题动态预测运行时间少;热点话题预测漏检率低,可精准描述热度值变化趋势。

面向互联网舆情的热词分析技术

热词是一种网络词汇现象,反映了某一特定时空范围内人们普遍关注的问题。该文对热词分析的两项关键技术——热词发现和热词关联技术进行了深入的研究。在热词发现阶段,首先采用命名实体识别技术和高频串统计技术进行短语串的挖掘,继而采用基础权值和波动权值两项指标进行热度权值的计算。在热词关联阶段,按热词权值高低进行热词类的划分,通过同现率的原则确定热词类之间的关联计算。该文所采用的方法已经成功应用到TRS舆情监测系统的热点发现模块。

网络热点信息识别方法研究

热点信息识别是网络舆情分析与监控领域内的一项基本工作。分析了用于衡量网络事件热度的性能指标,提出通过计算事件热度的方式来识别出当前网络热点信息。

基于聚类的网络新闻热点发现研究

随着互联网的迅速发展,网络已成为各大媒体发布新闻和人们获取信息的主要渠道。而网络新闻复杂多样,并不是每一条新闻都是人们关注的热点。为了快速准确地获得用户关注的热点事件,提出将三种聚类算法相结合的话题发现算法和热度计算公式,并通过实验验证利用上述方法进行热点发现的可行性。

面向藏文WEB的话题发现系统的设计

针对互联网上新闻网站和论坛、博客等发布的海量自然语言文本,本文设计了一个面向藏文的话题发现系统,将大量藏语文本分类整理并聚合成各个话题。本文采用两层聚类策略对文本进行聚类,实验结果表明文本聚类取得了不错的结果,具有较高的应用价值。

Feasibility Research on Application of a High Frequency Induction Heat to Line Heating Technology

The purpose of this paper is to investigate the feasibility of high-frequency induction heat for the line heating process through a series of experimental studies and numerical calculations. The results show that the heating temperature of induction heating meets the demands of steel plate bending, and the deformation of a steel plate heated by induction heating can achieve the same effect as flame heating. Meanwhile, the finite element model of moving induction heating of the plate is developed, and the comparison of the residual strain fields and transverse shrinkage between these two kinds of heating shows that great similarity has been achieved.

Analytic computation on the forcible thawing temperature field formed by a single heat transfer pipe with unsteady outer surface temperature

A comprehensive and systematic research on the forcible thawing temperature field formed by a single heat transfer pipe with unsteady outer surface temperature was carried out by analytic computation according to the theory of similitude. The distribution law of thawing temperature field, calculation formulas of thawing radius b, heat flux density q and average thawing temperature T were obtained. It theoretically explains that the main influential factors of thawing radius b, heat flux density q and thawing average temperature T are K,f, Lx and co（l）, but Lc affects little. Finally, based on the forcible thawing project of Hulusu air shaft lining, the field data indicate that the analytical formulas of this article are comparatively accurate.

Effect of nonlinear liquidus and solidus on dendrite growth in bulk undercooled melts

On the base of nonlinear liquidus and solidus,an extended model for dendrite growth in bulk undercooled melts was developed under local non-equilibrium conditions both at the interface and in the bulk liquid.In terms of thermodynamic calculations of the phase diagram,the model predictions are relatively realistic physically,since few fitting parameters are used in the model predictions.Adopting three characteristic velocities,i.e.the critical velocity of absolute solute stability(VC*),the velocity of maximal tip radius(VRm),and the velocity of bulk liquid diffusion(VD),a quantitative agreement is obtained between the model predictions and the experimental results in undercooled Ni-0.7%B and Ni-1%Zr(molar fraction) alloys,and the overall solidification process can be categorized.

Passivity Degradation of Nuclear Materials in Reduced Sulfur Environments:A Review

This paper reviews sulfur-induced passivity degradation of nuclear materials with emphasis on steam generator(SG)alloys. The state of arts on this topic concerning thermodynamic calculation and experimental data has been reviewed. Thermodynamic calculation results indicate that the distribution of sulfur species strongly depends on p H and temperature. Experimental data show that solution p H, temperature and solution chemistries can significantly affect the electrochemical behaviors of SG materials and the underlying degradation mechanisms. Some issues when conducting corrosion tests at high temperature should be paid attention to, such as the dissolution of the autoclave, which may affect the facticity of the experimental results.

Relationship between oceanic heat content and sea surface height on interannual time scale

The relationship between heat content and the interannual time scale is examined with satellite sea surface height （SSH） in the global ocean on altimeter measurements, historical hydrography, and model assimilation outputs. Results show that correlation between altimetric SSH and heat content in the upper 700 m calculated from Ishii data is geographically nonuniform. In the tropical ocean, heat content and SSH are strongly correlated and exhibit nearly the same interannual variations. In the polar ocean, their correlation is relatively weak. Further analysis with Simple Ocean Data Assimilation outputs shows that such nonuniform distribution is not from dynamical origin but from the limited integral depth selected to calculate heat content. The integral depth of 700 m is inadequate to capture variation of the deep main thermocline in the polar region. The halosteric effect also contributes to the nonuniform pattern of correlation, because saline contraction becomes significant in the polar ocean owing to low temperature.

Fractal analysis of thermal conduction of loose coal

For deep mining engineering, heat transfer of coal mass is a vital factor in the thermal environment of coal mines. In order to study the thermal conduction mechanism, we obtained gray images of coal mass microstructure by scanning samples with a digital microscope. With the use of Matlab, these gray images were transformed into binary images, which were then transformed into a corresponding matrix consisting only of the values 0 and 1. According to the calculation method of box-counting dimension, we calculated the fractal dimension of the loose coal to be approximately 1.86. The thermal conductivity expressions of loose coal were derived based on the simulation method of thermal resistance. We calculated the thermal conductivity of loose coal by using a fractal model and compared the calculated values with our experimental data. The results show that the test data show an encourag-ing agreement with the calculated values. Hence fractal theory is a feasible method for studying thermal conductivity of loose coal.

Calculation on inner wall temperature in oil-gas pipe flow

Based on the energy equation of gas-liquid flow in pipeline,the explicit temperature drop formula for gas-liquid steady state calculation was derived.This formula took into consideration the Joule-Thomson effect,impact of terrain undulation and heat transfer with the surroundings along the line.Elimination of temperature iteration loop and integration of the explicit temperature equation,instead of enthalpy energy equation,into the conjugated hydraulic and thermal computation have been found to improve the efficiency of algorithm.Then,the inner wall temperature of gas-liquid flow was calculated by using explicit temperature equation and inner wall convective heat transfer coefficient of mixed flow which can be obtained by liquid convective heat transfer coefficient and gas convective heat transfer coefficient on the basis of liquid holdup.The temperature results of gas-liquid flow and inner wall in the case example presented both agree well with those in professional multiphase computational software OLGA.

Modeling and Simulation of Heat Transfer through an Electric Wire

This paper illustrates the use of a general purpose differential equation （DE） solver called FlexPDE for the solution heat transfer problems in electric wire. FlexPDE uses the finite element method for the solution of boundary and initial value problems. A flexible input of the governing DE＇s and of material properties functions allows the simulation of non-linear variable behavior quickly and inexpensively. A modeling of temperature distribution in one-dimensional problem, a cross section of an electric wire was simulated. Comparison of those results obtained by FlexPDE with analytical and numerical solutions are done. The results compared well with those obtained from the analytical and numerical methods. The adaptability of the FlexPDE software for solving a variety of problem types was clearly demonstrated.

Discussion and study on contraction joints for RCC gravity dam

Based on the construction property of rolled compacted concrete, three-dimensional finite element relocating mesh method was developed in simulating construction process and computing temperature and stress field. Using this method, the temperature and the thermal stress fields developed in the RCC gravity dam of the Longtan project with or without a longitudinal joint during construction and operation are calculated so as to simulate the construction process. The computation results show that the value of the thermal stresses developed in the dam even, without any longitudinal joint, could meet the design criteria provided the placement temperature is adequately controlled.

基于多源数据的专业领域热点探测模型研究

[目的/意义]面向出版业进行专业领域出版时的选题决策问题,对互联网上公开的资讯动态进行多源整合,通过多维度的情报分析探测专业领域内的热点,实现数据驱动的出版选题决策,为出版业的数字化转型与发展奠定坚实基础。[方法/过程]设计一个情报分析模型,面向出版选题决策进行专业领域的热点探测。模型包含热点发现与热度评价两个过程。热点发现过程,通过词频统计和词增长速度算法对专业领域内的热点进行识别;热度评价过程,从内容层面和传播层面两个维度设计并计算一系列指标,对识别到的热点进行热度评价与排序。[结果/结论]以2018年1月至4月的36550条信息、通讯和技术领域多源中文信息为样本进行热点探测实验,实验结果表明,设计的热点探测模型可以有效地探测专业领域内的热点,辅助出版业科学地进行专业领域选题决策。