LABRADOR: Efficiently publishing relational databases on the web by using keyword-based query interfaces

A vast amount of valuable information, produced and consumed by people and institutions, is currently stored in relational databases. For many purposes, there is an ever increasing demand for having these databases published on the Web, so that users can query the data available in them. An important requirement for this to happen is that query interfaces must be as simple and intuitive as possible. In this paper we present LABRADOR, a system for efficiently publishing relational databases on the Web by using a simple text box query interface. The system operates by taking an unstructured keyword-based query posed by a user and automatically deriving an equivalent SQL query that fits the user’s information needs, as expressed by the original query. The SQL query is then sent to a DBMS and its results are processed by LABRADOR to create a relevance-based ranking of the answers. Experiments we present show that LABRADOR can automatically find the most suitable SQL query in more than 75% of the cases, and that the overhead introduced by the system in the overall query processing time is almost insignificant. Furthermore, the system operates in a non-intrusive way, since it requires no modifications to the target database schema.     

三角形内插点最佳点位及其可靠性规律

通过三角形内插点的点位误差分析得出最佳点位的分布规律，并分析了插点观测值的可靠性。     

大学生课外体育锻炼坚持行为的影响因素研究

运用结构方程模型方法对230名普通大学生课外体育锻炼的主要影响因素进行了实证分析。结果显示:研究采用的结构方程模型与研究假设和构想概念拟合度较好;锻炼条件、锻炼氛围和锻炼承诺三变量对大学生课外体育锻炼坚持行为有较好地预测和解释。其中,影响大学生课外体育锻炼坚持机制中起主导作用的是内因——参与体育锻炼的行为意图(锻炼承诺)。锻炼氛围对锻炼坚持行为的直接作用路径在有无锻炼承诺群体中均具有显著性意义,即能使个体从无锻炼承诺向有锻炼承诺转变,促进有锻炼承诺的群体更长久地坚持体育锻炼。     

加强实践教学走产学合作之路培养应用型人才

通过近几年测量专业实践教学改革内容的阐述,指出了老专业如何适应市场需要进行改革,并通过产学合作,探讨最佳办学模式,为其它老专业改造提供了经验。     

Investigating the double-deficit hypothesis of developmental dyslexia in an orthography of intermediate depth

The present study aimed to investigate the double-deficit hypothesis (DDH) in an orthography of intermediate depth. Eighty-five European Portuguese-speaking children with developmental dyslexia, aged 7 to 12, were tested on measures of phonological awareness (PA), naming speed (NS), reading, and spelling. The results indicated that PA and NS were not significantly correlated, and that NS predicts reading fluency (but not reading accuracy and spelling) beyond what is accounted for by PA. Although the majority of the children with developmental dyslexia have double deficit (62.4%), some children have a single phonological deficit (24.7%) or a single NS deficit (8.2%). Children with a double deficit were not more impaired in reading fluency, reading accuracy, and spelling than both single-deficit subtypes. In conclusion, the findings of the present study are partially consistent with the DDH and provide evidence for the multifactorial model of developmental dyslexia. Implications of the DDH for an orthography of intermediate depth are emphasized.

     

中国学生跨文化言语交际中的负语用迁移研究

本文分析归纳了负语用迁移在中国学生言语交际中体现的四个方面。指出负语用迁移现象的存在应引起中国广大教师和学生的重视,但也不要过分夸大负语用迁移在中国学生跨文化言语交际中的负面影响,应客观全面地看待负语用迁移,正视其负面影响,利用其正面影响,促进跨文化言语交际的顺利进行。     

Energetic demand and physical conditioning of table tennis players. A study review

Table tennis is a racket sport characterised by an intermittent movement profile, including short rallies interspersed with short breaks. In contrast to other racket sports, information is lacking regarding the: (i) physiological responses during table tennis matches and training; and (ii) practical recommendations for enhancing aerobic and anaerobic performance in table tennis by improving cardio-metabolic and neuro-muscular fitness, anthropometry and nutritional strategies. Therefore, this review article attempts to narratively provide an overview of the physiology of table tennis by describing the metabolic mechanisms underlying match play and outlining a framework for practical recommendations for improving cardio-metabolic and neuro-muscular fitness, anthropometry as well as nutritional strategies. A second aim was to stimulate future research on table tennis and to point out study limitations in this context. In general, the most important finding is that the rally duration is short at around 3.5s, with a longer rest time of around 8–20s, resulting in an effort-rest ratio ranging from 0.15 to 0.22 in official matches and energetic demands during match relatively low. Future studies should focus on the relationship between energetic demand and table tennis performance with a view to predicting performance in table tennis using physiological parameters.     

Have the poor found their own appropriate

Correspondence schools in Brazil are entirely in the hands of private entrepreneurs and ignored, even despised, by official educators. Yet, as this paper shows, they can, —in many cases, do—, provide helpful education for those who have no other access to educational opportunity. Indeed, they appear to offer the most equal form of opportunity. Accompanying their benefits, however, are many imperfections and abuses. The paper identifies five areas where government intervention could help both the public and the correspondence schools, without stifling their current vitality.     

测角后交最佳点位的研究

分析了影响测角后交点位精度的因素，绘出三角形三个内角最佳点位图形系数曲线，并比较了三个最佳点位的精度，指出获得更高精度的方法。     

两种不同纳米金修饰方法制备的Au/CeO2复合物的抗氧化性能

以水热法制备的CeO₂纳米棒为载体,分别采用溶胶法和沉积法对其进行纳米金修饰,得到两种不同纳米金修饰方法制备的Au/CeO₂复合物。在MV-Fenton体系中用紫外分光光度法对两种Au/CeO₂复合物的抗氧化性能进行研究。结果表明：溶胶法制备的Au/CeO₂（S-Au/CeO₂）比沉积法制备的Au/CeO₂（D-Au/CeO₂）展现出更好的抗氧化性能。进一步研究表明：沉积法制备过程可能破坏了CeO₂的表面结构,导致其抗氧化性能降低;另外,溶胶法负载的AuNPs和CeO₂之间的电子传递也使其抗氧化性能增强。