数据仓库技术在物流控制上的应用

文章以快运公司的托运业务分析系统为背景,介绍了数据仓库的设计与实现技术,并给出基于数据仓库环境的数据挖掘的应用实例。     

CPLD/FPGA的优化设计

CPLD/FPGA面向速度或面向面积进行优化设计，在大多数情况下这两种选择是矛盾的。对速度进行优化设计，需要较多资源；对面积进行优化往往会导致系统速度降低。本提出采用流水线设计、资源共享和预进位处理的方法解决了这个问题。     

智能数显腰轮流量计

将单片微型计算机技术与罗茨测量技术相结合，采用非接触式传感器，实现了流量计在全量程范围内的误差自动补偿与修正．该流量计自带发信器，且具有全封闭和可拆特点，可显示累和流量值与瞬时流量值，并能进行远传测量．     

智能化中压开关柜的监测和传感技术(一)

文章综述了用于中压开关柜监测、测量的两大类传感器:电流和电压测量保护用传感器,非电量数值传感器。新型的电流和电压传感器优越性明显,在解决了细节及接口问题后,将逐渐安装使用。非电量数值传感器技术是将开关柜“定期”维护转变为“按状态”维护的关键技术,有很好的应用前景。     

智能化中压开关柜的监测和传感技术(二)

文章综述了用于中压开关柜监测、测量的两大类传感器：电流和电压测量保护用传感器;非电量数值传感器。新型的电流和电压传感器优越性明显,在解决了细节及接口问题后,将逐渐安装使用。非电量数值传感器技术是将开关柜“定期”维护转变为“按状态”维护的关键技术,有很好的应用前景。     

基于GPRS的船载远程监控终端设计

利用GPRS和Internet技术,在μC/OS-Ⅱ嵌入式实时操作系统环境下,实现船载远程监控系统中船载监控终端的设计.主要介绍系统总体和功能设计,详细介绍船载监控系统终端的软、硬件设计及调试,验证基于GPRS的船载远程监控系统的可行性,为船舶远程作业的实时控制提供一种有效的方法.     

东巴纸牌画及其艺术与文化特征

东巴纸牌画起源于公元3世纪左右。从流传至今的东巴纸牌画内容来看,可分为祭祀类、占卜类、头冠类3类,主要以动物、鬼神及日月星辰、山川草木等为题材。其构图方式主要有中心性构图、连环性构图、分割性构图、叙事性构图等。不同题材的纸牌画所采取的构图方式不同,色彩的运用也不相同:描绘神界、神像、神物等常用浅色调,以彰显和谐、祥和之气;而绘制鬼怪之类则多用深色调,显得诡异阴森,给人以威慑力。其常采用线条勾勒绘画对象,以表达纳西人对体积三度空间的认识。东巴纸牌画的文化内涵表现出强烈的民族性、宗教性和地域性特征。     

福建省城市水资源承载力综合评价研究

从水资源系统、社会经济系统和生态环境系统3个方面着手,构建福建省城市水资源承载力评价指标体系,并利用模糊综合评价模型对福建省城市水资源承载力进行综合评价。结果表明:福建省城市水资源开发利用已具有相当规模,城市水资源的供给需求是有一定保障的,城市水资源仍具有一定的开发利用潜力;分区城市中,厦门市与漳州市城市水资源状况较为紧张,厦门市未来城市水资源形式不容乐观。研究结果可为福建省城市水资源管理提供参考。     

Influence of zirconia crystal phase on the catalytic performance of Au/ZrO2 catalysts for low-temperature water gas shift reaction

The influence of crystal phase of zirconia on the performance of Au/ZrO₂ catalysts for low temperature water gas shift reaction was investigated. Au/ZrO₂ catalysts with pure tetragonal and monoclinic phases of ZrO₂ were prepared by the deposition-precipitation method with similar gold loading and dispersion. It was found that the Au/m-ZrO₂ catalyst showed much higher activity than that of the Au/t-ZrO₂ catalyst, which could be attributed to the higher CO adsorption capacity of the Au/m-ZrO₂ catalyst. The chemical state of gold that was strongly related to the pretreatment atmosphere also played an essential role in determining the catalytic activity for water gas shift reaction. Hydrogen and/or helium pretreated samples only contained Au⁰ species and exhibited higher activity than that of the sample pretreated with oxygen-containing atmosphere which resulted in the co-existence of Au⁰ and Au⁺ species. FTIR study further revealed that the formate species formed by the reaction of the adsorbed CO on gold nanoparticle with the hydroxyl groups on the surface of m-ZrO₂ acted as the most important intermediates for the water gas shift reaction.     

Pt/MnOx–CeO2 catalysts for the complete oxidation of formaldehyde at ambient temperature

MnO_x–CeO₂ mixed oxides with a Mn/(Mn + Ce) molar ratios of 0–1 were prepared by a modified coprecipitation method and investigated for the complete oxidation of formaldehyde. The MnO_x–CeO₂ with Mn/(Mn + Ce) molar ratio of 0.5 exhibited the highest catalytic activity among the MnO_x–CeO₂ mixed oxides. Structure analysis by X-ray powder diffraction and temperature-programmed reduction of hydrogen revealed that the formation of MnO_x–CeO₂ solid solution greatly improved the low-temperature reducibility, resulting in a higher catalytic activity for the oxidation of formaldehyde. Promoting effect of Pt on the MnO_x–CeO₂ mixed oxide indicated that both the Pt precursors and the reduction temperature greatly affected the catalytic performance. Pt/MnO_x–CeO₂ catalyst prepared from chlorine-free precursor showed extremely high activity and stability after pretreatment with hydrogen at 473 K. 100% conversion of formaldehyde was achieved at ambient temperature and no deactivation was observed for 120 h time-on-stream. The promoting effect of Pt was ascribed to enhance the effective activation of oxygen molecule on the MnO_x–CeO₂ support.