Improving the learning of Boolean queries by means of a multiobjective IQBE evolutionary algorithm

The Inductive Query By Example (IQBE) paradigm allows a system to automatically derive queries for a specific Information Retrieval System (IRS). Classic IRSs based on this paradigm [Smith, M., & Smith, M. (1997). The use of genetic programming to build Boolean queries for text retrieval through relevance feedback. Journal of Information Science, 23(6), 423–431] generate a single solution (Boolean query) in each run, that with the best fitness value, which is usually based on a weighted combination of the basic performance criteria, precision and recall.     

Rapid mask prototyping for microfluidics

With the rise of microfluidics for the past decade, there has come an ever more pressing need for a low-cost and rapid prototyping technology, especially for research and education purposes. In this article, we report a rapid prototyping process of chromed masks for various microfluidic applications. The process takes place out of a clean room, uses a commercially available video-projector, and can be completed in less than half an hour. We quantify the ranges of fields of view and of resolutions accessible through this video-projection system and report the fabrication of critical microfluidic components (junctions, straight channels, and curved channels). To exemplify the process, three common devices are produced using this method: a droplet generation device, a gradient generation device, and a neuro-engineering oriented device. The neuro-engineering oriented device is a compartmentalized microfluidic chip, and therefore, required the production and the precise alignment of two different masks.     

Bandpass sorting of heterogeneous cells using a single surface acoustic wave transducer pair

Separation and sorting of biological entities (viruses, bacteria, and cells) is a critical step in any microfluidic lab-on-a-chip device. Acoustofluidics platforms have demonstrated their ability to use physical characteristics of cells to perform label-free separation. Bandpass-type sorting methods of medium-sized entities from a mixture have been presented using acoustic techniques; however, they require multiple transducers, lack support for various target populations, can be sensitive to flow variations, or have not been verified for continuous flow sorting of biological cells. To our knowledge, this paper presents the first acoustic bandpass method that overcomes all these limitations and presents an inherently reconfigurable technique with a single transducer pair for stable continuous flow sorting of blood cells. The sorting method is first demonstrated for polystyrene particles of sizes 6, 10, and 14.5 μm in diameter with measured purity and efficiency coefficients above 75 ± 6% and 85 ± 9%, respectively. The sorting strategy was further validated in the separation of red blood cells from white blood cells and 1 μm polystyrene particles with 78 ± 8% efficiency and 74 ± 6% purity, respectively, at a flow rate of at least 1 μl/min, enabling to process finger prick blood samples within minutes.     

An improved method for computing Hankel transform

The purpose of this paper is to compute the Hankel transform F_n(y) of order n of a function f(x) and its inverse transform using rationalized Haar wavelets. The integrand is replaced by its wavelet decomposition. Thus representing F_n(y) as a Fourier-Bessel series with coefficients depending strongly on the local behavior of the function , thereby getting an efficient algorithm for their numerical evaluation. Numerical evaluations of test functions with known analytical Hankel transforms illustrate the proposed algorithm.     

Improved approaches to stability criteria for neural networks with time-varying delays

In this paper, the problem of stability analysis for neural networks with time-varying delays is considered. By the use of a newly augmented Lyapunov functional and some novel techniques, sufficient conditions to guarantee the asymptotic stability of the concerned networks are established in terms of linear matrix inequalities (LMIs). Three numerical examples are given to show the improved stability region of the proposed works.     

利用双标图分析基因型和环境交互作用

在作物的品种区域化试验中，品种的基因型和环境（Ｇ×Ｅ）交互作用越来越受到重视．一种新的非常有效的分析Ｇ×Ｅ交互作用模型是加性主效应和乘积交互作用模型（简称ＡＭＭＩ模型），而双标图（ｂｉｐｌｏｔ）是解释ＡＭＭＩ分析结果的一种直观有效的图形工具．本文对ＡＭＭＩ模型及双标图作一扼要介绍，并选用１９９５年南方水稻区试单季晚粳组数据作为实例，给出了两种新的双标图，以帮助我们更深入地了解Ｇ×Ｅ交互作用．     

Organizing, Teaching, and Assessing for Student Success in Introductory College Physics

As part of a doctoral dissertation, Ben （2010） completed a study that extends to 462 pages. After a careful examination of this study and others that are in print, there seems to be a direct relationship between the decline in physics enrollment at the postsecondary level and the increase in the number of studies that have been carried out to determine why have we been off the mark in identifying the real problems that are contributing to the declining enrollment and the decreased student success in physics courses？ One problem is introductory physics books are generally written using a deductive approach, and because the teachers follow the organization of these books, they teach in a deductive, boring, and confusing way, and then, blame the students for being unprepared when they do not succeed. This approach distances the teachers--and physics--from the experience, knowledge, and initial interest of many beginning students. Another problem has been the absence of any alternative curriculum to the deductive one. In this paper, we describe a fully-developed alternative curriculum, really a detailed course design for Introductory College Physics I and II, each with its own text presented in the format of a three-ring binder, one for students and one for teachers which closely parallel one another. The course content is constructed to be both teacher and student friendly, so that a teacher can teach physics in an inductive, exciting, and clear manner. In addition, we describe and provide examples of the pedagogical and classroom management techniques that have proven extremely successful.     

Clapping with two hands: Bringing together local and outside knowledge for innovation in land husbandry in Tanzania and Ethiopia ‐ a comparative case study

Abstract

Promoting rural development in Africa involves learning to clap with two hands, that is to say, creating effective interaction between local knowledge and development initiatives, on the one hand, and the knowledge and initiatives of formal agricultural research and extension, on the other. Farmer innovators ‐men and women farmers who take their own initiative to change local agriculture ‐ are key allies in rural development, as shown by the experience of the ISWC programme in Africa. Focusing on Ethiopia and Tanzania, the authors describe how formal research and extension services are made aware of farmers’ innovative work and are encouraged to document the results, promote their spread, and support further development efforts by farmer innovators. A modified Participatory Technology Development (PTD) approach is thus emerging, which starts not with problem analysis but rather by linking up with local problem‐solving initiatives. While the learning process on this approach continues, dialogue has been initiated with policy‐makers with a view to incorporating the approach into regular government extension, research and training activities.     

ANALYSIS OF CONTENTS,CONTRIBUTORS, AND RESEARCH DIRECTIONS: MAPPING PUBLICATION ROUTES IN THE JOURNAL

A content analysis of the journal Religious Education: An Interfaith Journal of Spirituality, Growth and Transformation was conducted for a 10-year period between 1993–2002 (Volume 88, 1–Volume 97, 4). A total of 325 articles (277 authors) were analyzed into 3 primary research directions (theoretical, qualitative, and quantitative). Author institutional affiliation, religious identity, position, geographic location, and number of contributions were also computed. Implications for the Journal and the field of religious education are discussed.     

Preschool teachers and classroom aides: Same context,similar perceptions of children's behaviors?

This study explored the correspondence and differences between school staff perceptions of preschool children's social skills and behavior problems. One hundred preschoolers were assessed by 14 pairs of teachers and classroom aides with the Preschool and Kindergarten Behavior Scales – 2^nd Edition (PKBS‐2 Portuguese version). Indexes of agreement and disagreement were calculated. Risk levels and item analyses of PKBS‐2 scores according to both informants' ratings were compared. A higher level of agreement was obtained for social skills scores than for behavior problems (mean correlation of .62). No statistically significant differences between informants were obtained for the risk levels, and item analyses revealed a similar pattern of behaviors that were most and least rated by both informants. Results indicate that the classroom aides' perspective on preschool assessment represents a reliable input, which justifies that they network with teachers in addressing preschoolers' social‐emotional and behavioral challenges.