一种基于混合型结构优化算法——Apriori-Mend算法

关联规则挖掘是数据挖掘领域中最重要的研究问题之一。Apriori是关联规则挖掘的一种经典算法,它使用候选项集产生测试机制来找出所有满足用户最小支持度的项集,但它需要多次扫描数据库,会产生大量的候选项集。针对Apriori算法的不足,提出了一种基于混合型新的优化算法:Apriori-Mend算法。该算法从优化产生2项集、事务压缩等几个方面对Apriori算法进行优化,将散列技术应用于产生1项集和2项集,采用库优化策略和混合型存储结构,以节省空间和运算时间。实验结果表明,Apriori-Mend算法运行速度比Apriori算法有明显的提高。

浅析明人陶瓷修复理念

陶瓷修补史是中国陶瓷史和手工艺史的重要组成部分。我国古代的陶瓷修复产生于新石器时期,到明代开始走向发展的巅峰期。笔者对明代陶瓷修补资料进行梳理,对修补的对象进行分类、修补的概念进行界定,总结明朝人展现的陶瓷修复理念为“恢复器物本身的美学价值”和“展现器物的残缺美”。

基于埋入式压电智能骨料的裂缝修补深度质量检测试验研究

在缺陷混凝土构件的裂缝修补问题中,仅通过外观检测无法准确判断其修补质量,而目前缺少高效、规范的无损检测手段。通过在结构中预先埋入压电“智能骨料”,对比分析应力波在不同介质条件中发射及接收信号的差异,以及应用信号处理技术的相关知识,对裂缝修补不同阶段产生的信号变化进行研究,并由此评估裂缝修补质量。研究结果表明:混凝土裂缝深度大小对“智能骨料”接收端接收到的应力波波形有着很大的影响,通过对接收信号进行时域分析,进而利用小波包分解处理后的能量分析后发现,即使初始裂缝深度不同,修补完好的构件将具有相近的能量值。因此,在该方法中将基于小波包能量得到的裂缝修补质量的评价指标是切实可行的。

大体积混凝土裂缝成因及控制修补措施研究

主要分析了大体积混凝土出现裂缝的成因、控制措施,以及行之有效的修补方法。针对某城市高架桥承台、墩身等大体积混凝土出现裂缝的数据分析,结合混凝土原材料和施工环境分析其特征,总结施工过程中的处理方法,旨在有效预防与控制大体积混凝土裂缝,延长其寿命,为类似工程施工提供参考与借鉴。

混凝土裂缝修补质量的Lamb波技术无损检测

目前对于缺陷混凝土裂缝修补质量的检测,大多是通过外表观察,产生疑问之后对其进行破坏性检测。为探究一种无损检测方法,本文通过应用ABAQUS软件建立有裂缝的缺陷混凝土梁有限元模型,选择最优激励信号,应用Lamb波在跨缝对称检测模式下检测混凝土梁缺陷,通过对比修补前后混凝土构件中接收区域时域信号的小波包能量差,引入两种评价体系,得到裂缝修补质量的评价指标。研究表明,应用Lamb波技术检测混凝土裂缝修补质量有很好的效果。

Clean-up and disposal process of polluted sediments from urban rivers

In this paper, the discussion is concentrated on the properties of the polluted sediments and the combination of clean-up and disposal process for the upper layer heavily polluted sediments with good flowability. Based on the systematic analyses of various clean-up processes, a suitable engineering process has been evaluated and recommended. The process has been applied to the river reclamation in Yangpu District of Shanghai City, China. An improved centrifuge is used for dewatering the dredged sludge, which plays an important role in the combination of clean-up and disposal process. The assessment of the engineering process shows its environmental and technical economy feasibility, which is much better than that of traditional dredging-disposal processes.

Bench-Scale Testing of Zinc Ferrite Sorbent for Hot Gas Clean-up

Advanced integrated gasification combined cycle （IGCC） power generation systems require the development of high-temperature, regenerable desulfurization sorbents, which are capable of removing hydrogen sulfide from coal gasifier gas to very low levels. In this paper, zinc ferrites prepared by co-precipitation were identified as a novel coal gas desulfurization sorbent at high temperature. Preparation of zinc ferrite and effects of binders on pore volume, strength and desulfurization efficiency of zinc ferrite desulfurizer were studied. Moreover, the behavior of zinc ferrite sorbent during desulfurization and regeneration under the temperature range of 350-400 ℃ are investigated. Effects of binders on the pore volume, mechanical strength and desulfurization efficiency of zinc ferrite sorbents indicated that the addition of kaolinite to zinc ferrite desulfurizer seems to be superior to other binders under the experimental conditions.

A Brief Comment on Frost's Mending Wall

Poetry reading is a process of constantly discovering process.Robert Frost is the most popular 20th century American poet.His poetry has a unique artistic charm.Through the analysis of his poem"Mending Wall",this article tries to interpret Robert Frost's phonology Metrical the distinct characteristics and style in his poetry.

Interpretation of Robert Frost＇s ＂Mending Wall＂

Robert Frost is skillful at adopting symbolism and images in his poems. ＂Mending Wall＂, one of Frost＇s well-known poems, had been analyzed in different approaches, such as psychoanalytical approach, social approach and structural approaches, etc. By exploring the symbol and images applied in ＂Mending Wall＂, it draws the conclusion that ＂the wall＂, symbolizing convention, is set as a barrier in human communication.

Simultaneous Determination of Four Estrogens in Compost Based on Ultrasonic Solvent Extraction, Solid-Phase Extraction Clean-Up and Analysis by UHPLC-MS/MS

A rapid, cost effective and reliable analytical method was developed and validated for the simultaneous determination of four estrogens (17 β-estradiol, 17 α-ethinylestradiol, estrone, and estriol) in compost samples from the biodegradation of biological infectious hazardous wastes. Ultrasonic solvent extraction, using methanol as extraction solvent, coupled with SPE clean-up, using cartridges HLB 60 mg - 6 ml Supelco® and acetonitrile for reconstitution of eluents, was used for the simultaneous extraction of the four estrogens. Mean recoveries in the range of 98% - 107% were obtained. All compounds were separated in a single gradient run by UHPLC KinetexTM 2.6 μm XB-C18 100 ÅLC (50 × 4.6 mm) column. Analytes were detected via multiple reaction monitoring (MRM) using an AB SCIEX API-5000TM triple quadrupole (Applied Biosystems/MDS SCIEX) with electrospray ionization in negative mode. Isocratic mobile phase of Water:ACN (50:50) resulted to be the optimum. Limits of detection and quantification were on the order of 0.66 ng·g-1 and 2 ng·g-1 for all the estrogens. These limits were lower than most of the values reported in the literature for similar matrices. Suitable level of linearity, good repeatability and reproducibility with coefficients of variation is lower than 11.7%, 6.8% and 8.3%, respectively.

Production and Destination of Solid Waste in the Chico Mendes Extrative Reserve, Acre, Brazil

The process of development of the Amazon, in post-1970, has led to serious socio-economic and environmental problems, such as the struggle for land ownership and huge deforestation. Conservation units, such as extractive reserves (RESEX), appear as sustainable development alternatives for the region. Today, solid waste has become one of the main environmental problems, particularly in forest areas. The aim of the present work is to analyze the production and destination of solid waste in the Chico Mendes RESEX, state of Acre, in the periods 1996/1997, 2005/2006 and 2014/2015. We work with the methodology of the ASPF project, developed at the Federal University of Acre (UFAC), based on indicators of economic results, as well as the production and destination of solid waste. The results indicate a considerable increase in the generation of solid waste in the forest, especially of plastics coming from goods acquired in the market and without adequate disposal.

Mending Faces

The first World War caused a great advance in plastic surgery.that is,the surgery which improves the appearance.The New Zealand doctor,HaroldDell Gillies (born 1882),was one of the great plastic surgeons.This passage istaken from the author’s book Great Moments in Medicine (1960),and it de-scribes some of Gillies’ problems.

Design and Development of a Vision-based Hydraulic Operated Mending Machine for Repairing 3W Forks

Three wheelers(3 Ws)are widely used in low and middle-income countries,particularly in Asia Pacific region as a comparatively cheap method to passenger transportation and goods delivery.The frequent use of 3 Ws in day-to-day activities have caused a large number of accidents causing injuries to their passengers.Less research has been carried out to identify the reasons behind 3 W accidents.The survey carried out prior to this research has identified that the stability control and speed control are the two key factors which the 3 W accidents attributed to.3 W fork is the main mechanical element that controls the balance and the stability of the vehicle.A damaged 3 W fork(a physical damage or a slight deformation)unbalances the 3 W and had been identified as one of the reasons for large number of accidents.Therefore,correctly reforming the damaged fork is of paramount importance,when concerning the safety of the 3 Ws.Traditionally,both heat-treating and cold-working techniques are used in the mending processes.Not only this manual-labor repairing process weakens the strength of the fork,but also the profile produced is inaccurate.This paper discusses a hydraulic operated fork mending machine with an image processing technique to reform the damaged forks in 3 Ws.An image comparator-based imaging technique is used for this machine vision-based visually guided fork repairing process.Three cameras have been used to capture the images from three perpendicular directions.A contour sketch of the original fork(before the deformation occurs)has been compared against the faulty fork,to assist the worker to carry out the repairing process.The preliminary experimentations have shown that the proposed technique can improve the repositioning of the camber angle by repairing the damaged fork.

神话原型移位于现实的伟大虚构——论贾宝玉“衔玉而生”的象征意义

就表现贾宝玉的思想性格而言,“衔玉而生”是一个很关键的象征。“玉”蕴藉了女娲补天精神,即用女性主义精神去补被男性主义破坏的“天”,由此“宝玉”成为了女性主义精神原型的象征。“衔玉而生”又是连接女娲补天神话和贾宝玉心理之间的媒介,使贾宝玉的现实思想行为获得了神话原型的潜意识心理。“衔玉而生”是一个伟大的虚构,在女娲补天神话和贾宝玉现实思想行为之间建立了一条内在原型联系的通道,从而使贾宝玉现实思想行为获得了神话原型的动力与解释。贾宝玉“衔玉而生”与贾宝玉最后回到大荒山成为一块石头,两者构成一种二元对立结构,这个二元对立结构表现了曹雪芹的深刻思想:“宝玉”重新变成石头也包含着“衔玉而生”的玉变成石头,指向的是现实对人的彻底毁灭和人的不可救药的大悲剧。

基于城市修补的小城镇人文特色提升规划策略与实践研究——以浙江东阳巍山镇为例

快速城镇化导致了小城镇文脉割裂。科学提升日益趋同的小城镇人文特色对于品质活力营建至关重要。城市修补理念适用于小城镇特色化发展趋势,文章通过探索其内涵和作用,以文化优势与景观资源协同规划为指引,重置了“要素识别、战略性设计、针对性修补、融合激活”的修补路径和修补方法,并以浙江东阳巍山镇为例,提出科学有效的规划设计策略体系。研究拓展了城市修补理念的应用范围,为实现小城镇人文系统化复兴提供了思路与借鉴。

易门铜业Φ2.4×3.6 m球磨机磨矿介质配比优化研究

针对易门铜业Φ2.4×3.6 m球磨机装补球制度不合理、磨矿产品细度低、分级机效率偏低及循环负荷偏高等问题,基于矿石的力学性质及粒度组成分布情况,采用段氏球径半理论公式对推荐初装介质配比进行计算,最终确定初装球方案为Φ80 mm∶Φ60 mm∶Φ50 mm∶Φ40 mm=30%∶25%∶25%∶20%。将推荐钢球配比方案与现场方案进行实验室磨矿对比试验,结果表明:与现场方案相比,推荐方案的过粗级别+0.150 mm产率降低了2.38个百分点,磨矿细度(-0.074 mm占比)提高了5.14个百分点,中间级别-0.150+0.010 mm产率提高了1.08个百分点,磨矿技术效率增长了3.39个百分点。由此可见,采用推荐初装钢球配比作为易门铜业Φ2.4×3.6 m球磨机磨矿介质,其优化效果明显。

结合山西某农房改造浅析农村房屋加固处理技术

介绍了农村房屋常见的几种类型以及常见的破损形式,对农村房屋常见的破损及成因进行了分析,同时结合工程实例,针对各类破损提出了相应的加固处理方案,为农村房屋该类缺陷的整改提供一定的参考。

基于“城市双修”的老旧公园更新改造

公园作为城市绿地系统的重要组成部分,是城市居民日常休闲、活动、社交的重要场所。大量公园随着建设时间久远,已呈现出生态恶化、设施老旧、缺少活力等问题,基于“城市双修”理念,利用城市修补技术对公园布局优化、功能完善、空间提升,以此激发公园活力,织补城市功能;利用生态修复技术对驳岸优化、水体治理、植物多样化配置,改善公园生态。以濑渚洲公园改造为实例,探索“城市双修”语境下老旧城市公园改造的科学方法和有效路径。

基于京绣(北京补绣)手工艺的文创产品设计研究

北京作为我国首都,其历史文化底蕴深厚,拥有大量珍贵的非物质文化遗产。其中,京绣(北京补绣)(后文简称为北京补绣)作为中国刺绣中独具一格的种类,用料讲究,工艺精美,是一门优秀的传统民间艺术。随着时代的不断发展,京绣手工艺的传承与发展逐渐遇到了一些问题,文章立足于调研现状,结合当前文创产品的流行趋势,梳理了北京补绣手工艺的传承和技法特征,探索北京补绣传统手工艺在现代手作文创产品中的创新应用方法。