High Marks for SmartMarks (A New Bookmarks Organizer from Netscape)

Abstract

Smart Marks, a new software tool from Netscape, is marketed as “Web surfing for people with a life.” This reviewer agrees that it is very useful for those of us who have a hard time keeping track of our bookmarks in Netscape Navigator. SmartMarks allows you to organize your bookmarks into folders, allows you to label and assigri key words to both bookmarks and folders, and monitors your bookmarks for changes in content or location. This last feature makes it an especially useful tool for librarians who have taken on all or part of the responsibility for maintaining a library's home page.     

A Review of “Technology and Literacy: 21st Century Library Programming for Children and Teens”

ABSTRACT

Given the endless volume of information available today, searchers are forced to satisfice when searching. The first satisfactory alternative is chosen over the best. Digital library search services, however, do not support satisficing users. There is no single, simple, comprehensive search service available to end-users to meet their need to gather information on alternatives from all information repositories accessible through a digital library. Federated search services bridge the gap between satisficing searchers and today's digital libraries.     

The Accuracy and Thoroughness of a Federated Search Engine in the Health Sciences

SUMMARY

Research studies show that researchers need to access multiple resources to ensure a comprehensive search. In the health care field, health professionals' time is very limited, and they would benefit from being able to access multiple resources simultaneously. Health professionals must retrieve the most relevant and accurate information possible when applying clinical information to patient care. While a federated search engine may offer speedy search capabilities, do they offer the same accuracy and relevancy as directly searching the core health sciences databases? The purpose of this study is to describe, evaluate, and compare searching health sciences topics using a federated search engine versus searching five core health sciences databases directly. The following databases were selected for this study: WebFeat (federated search engine), MEDLINE, CINAHL, Science Citation Index, Biological Abstracts, and EMBASE. While WebFeat is convenient for searching multiple databases simultaneously, it does not offer the advanced search limits offered by directly searching some of the health sciences databases. The lack of limits available in the federated search engine means increased results that may not be relevant to the busy health care professional.     

Planning and Implementing a Federated Searching System: An Examination of the Crucial Roles of Technical,Functional, and Usability Testing

SUMMARY

Federated searching software offers much promise to users as a convenient way of accessing the wealth of electronic information resources libraries provide. But metasearching is not the same as Google searching; care must be taken in organizing and presenting search options and results so that they are comprehensible to users. From software installation to usability testing and creating documentation, most of the work of implementation is behind-the-scenes and hidden from most library staff and users; however, the decisions made during implementation greatly affect staff and user experiences with the product as well as its overall utility and usability. Systematic testing of the product is necessary to make informed and defensible decisions. This article details three layers of testing (technical, functional, and usability) recommended during implementation of a federated search product, based on best practices in the literature, metasearch standards, and the authors' own experiences with implementing a locally developed broadcast search system and the federated search system WebFeat.     

Researching Recent U.S. Legislation Using Free Sites on the Internet

Abstract

This study investigates the effects of gender, college status, and prior Internet experience on the use of Internet resources. The subjects were 96 patrons randomly selected from those using the Internet terminals at the University Library of the University at Albany, SUNY, during the first two months of 1995. We found that the majority of users shared the following characteristics: they are male undergraduates affiliated with the social sciences and are novice users who have less than six months experience. Respondents felt strongly that the Internet is useful, and has been an important resource for their research and assignments. Users have high expectations of searching capabilities, while they feel neutral or disappointed with browsing. Our findings indicate that libraries should provide access to the Internet. They also suggest that libraries should take the lead in developing searchable indexes and making info-bases better organized for the ease and effectiveness of browsing.     

提升机综合后备保护装置减速点的设置方法

依次给出了提升机综合后备保护装置减速点到停车位距离的粗略计算公式、某段(点)到停车位的安全制动距离计算公式、某段(点)到停车位的超速持续判断安全制动距离的计算公式及减速点到停车位的超速持续判断安全制动距离的计算公式,在井口下与井口相距该安全制动距离的点即设置为减速点。该方法适用于提升机电控系统减速点随载重量自动调整时后备保护减速点的设置。应用结果表明,根据该方法设置的提升机综合保护装置减速点可保证在提升机电控系统减速点失效后使提升容器在井口以下安全停车,可靠性高。     

光伏电池最大功率点跟踪方法比较

根据太阳能光伏电池的工程数学模型,在Matlab环境下建立了光伏电池仿真模型,分析了光照强度和温度变化对光伏电池输出特性的影响。针对扰动观察法采用固定的扰动步长而难以获得较高跟踪精度和响应速度的问题,提出了一种基于变步长的改进的扰动观察法,并通过对光伏电池控制系统进行仿真,比较了这2种最大功率点跟踪方法的仿真曲线。结果表明,采用改进的扰动观察法的光伏电池控制系统能更快速跟踪最大功率点,且在最大功率点处稳定性较好。     

基于固有模态能量的暂态量选线方法

针对基于小波分析的煤矿电网故障选线方法由于分解效果取决于基函数的选择,不能保证最优分解效果的问题,提出了一种基于固有模态能量的暂态量选线方法。该方法利用经验模态分解对信号局部特征的自适应性,对单相接地故障零序电流的暂态特征进行分析,定义固有模态能量和能量权重因子作为故障特征参数,实现对故障暂态量信息的数据挖掘;求取故障后各馈线的零序暂态电流的固有模态能量,计算各馈线的能量权重因子,通过比较各馈线能量权重因子辨识出故障线路,即能量权重因子最大的线路就是故障线路。理论分析和仿真结果表明,该方法不受接地电阻、故障时间等故障条件的影响,能够准确可靠地实现煤矿高压电网故障选线。     

改进型双馈风力发电机最大功率点跟踪策略

针对传统双馈风力发电机最大功率点跟踪极值搜索策略将正弦信号作为搜索信号而很难将正弦信号从总的输出信号中区分出来的问题,提出了一种利用风湍流作为极值搜索信号的改进型最大功率点跟踪策略。该改进策略对叠加风湍流的叶尖速比和功率系数进行傅里叶变换,获得相位差信息,从而确定叶尖速比变化方向,使双馈风力发电机达到最佳运行工作点。仿真结果表明,该改进策略可控制风力发电机转速较好地跟踪风速变化,实现了额定风速以下运行区域的最大风能捕获。     

摄影测量中一种非编码点的自动匹配方法

在极限约束法基础上提出了一种非编码点匹配的改进算法,首先采用极限约束法得到候选匹配对应点,然后按编码点位置将图像Delaunay三角化,缩小匹配范用。在对应Delaunay三角形内确定匹配点,若在三角形范围内仍不能唯一的确定匹配点,则通过交比不变性来实现对应点的匹配。本方法不限制标志点的粘贴位置,满足摄影测量中实际应用要求。