Long-term productivity and sustainability of crop-livestock systems through integrated soil fertility management

Productivity in Crop-Livestock Systems can be maximized using Integrated Soil Fertility Management (ISFM). ISFM combines (i) improved germplasm (ii) mineral fertilizer application (iii) organic matter management and (v) adapted agronomy. CIAT established a long-term trial in Western Kenya in the village of Murumba Yiro in 2003 to assess ISFM technologies

Authentication and authorisation in entrusted unions

This paper reports on the status of a project whose aim is to implement and demonstrate in a real-life environment an integrated eAuthentication and eAuthorisation framework to enable trusted collaborations and delivery of services across different organisational/governmental jurisdictions. This aim will be achieved by designing a framework with assurance of claims, trust indicators, policy enforcement mechanisms and processing under encryption to address the security and confidentiality requirements of large distributed infrastructures. The framework supports collaborative secure distributed storage, secure data processing and management in both the cloud and offline scenarios and is intended to be deployed and tested in two pilot studies in two different domains, viz, Bio-security incident management and Ambient Assisted Living (eHealth). Interim results in terms of security requirements, privacy preserving authentication, and authorisation are reported

Surveying the Inner Halo of the Galaxy with 2MASS-Selected Horizontal Branch Candidates

We use 2MASS photometry to select blue horizontal branch (BHB) candidates covering the sky |b|>15 deg. A 12.5<J<15.5 sample of BHB stars traces the thick disk and inner halo to d<9 kpc, with a density comparable to that of M giant stars. We base our sample selection strategy on the Century Survey Galactic Halo Project, a survey that provides a complete, spectroscopically-identified sample of blue stars to a similar depth as the 2MASS catalog. We show that a -0.20<(J-H)_0<0.10, -0.10<(H-K)_0<0.10 color-selected sample of stars is 65% complete for BHB stars, and is composed of 47% BHB stars. We apply this photometric selection to the full 2MASS catalog, and see no spatial overdensities of BHB candidates at high Galactic latitude |b|>50 deg. We insert simulated star streams into the data and conclude that the high Galactic latitude BHB candidates are consistent with having no ~5 deg wide star stream with density greater than 0.33 objects deg^-2 at the 95% confidence level. The absence of structure suggests there have been no major accretion events in the inner halo in the last few Gyr. However, at low Galactic latitudes a two-point angular correlation analysis reveals structure on angular scales <1 deg. This structure is apparently associated with stars in the thick disk, and has a physical scale of 10-100 pc. Interestingly, such structures are expected by cosmological simulations that predict the majority of the thick disk may arise from accretion and disruption of satellite mergers.Comment: 11 pages, including figures. Accepted by AJ with minor revision

Instructional elements in an online information literacy Open Educational Resource (OER) and their influence on learner achievement, satisfaction, and self-efficacy

This study tested the influence of instructional elements within an online Open Educational Resource (OER) focused on information literacy (IL) on outcome measures of IL achievement, learner satisfaction and IL self-efficacy among undergraduate students. An online OER was designed to address the domains of access, evaluation and communication of IL guided by the notion of instructional scaffolding and self-regulated learning. Participants were randomly placed into one of six different OER conditions: (a) full version with all instructional elements, (b) lean version, (c) version without tooltip text, (d) version without embedded practice questions, (e) version without learning objectives and (f) version without summaries. There were no significant differences found across the six conditions on the dependent measures. Participants averaged 58% for IL achievement, performing slightly better in the domain of access versus evaluate and communicate. Limitations include a controlled laboratory setting where participants were not necessarily motivated to complete the study tasks at a high level of achievement. Future research can explore more ecologically valid environments where learners might be more motivated, along with more rigorous intervention and assessment construction. This paper includes implications for educators and researchers to explore the established and innovative instructional elements that are natural affordances of an online OER in IL. This paper presents innovative IL instruction that does not require instructor or learner training and evaluates its effectiveness using a sound, replicable methodological approach to isolate the effects of the individual instructional elements

Investigation of the Validity Evidence of the Information Literacy Self-Efficacy Scale (ILSES) Among Undergraduate Students

The purpose of this research was to provide validity evidence for the Information Literacy Self-Efficacy Scale (ILSES), a widely used instrument that was constructed in 2006. The researchers were interested in investigating the validity of this instrument due to the evolution of the information environment that has taken place since the scale’s original development, mostly as a result of the prominence of the Internet. Data were collected from N = 253 undergraduate students participating in a broader information literacy research study. Data were subjected to descriptive analyses, internal consistency reliability, and a confirmatory factor analysis (CFA). After evaluating three different CFA models based on the ILSES’ construction, the researchers determined that a four-factor model fit the data with the following latent constructs: 1) Initiating the search strategy, 2) Assessing and comprehending the information, 3) Interpreting, synthesizing, and using the information, and 4) Evaluating the product and process. A discussion of these findings is provided in light of the evolving information environments in which undergraduate students are expected to use information for their academic, personal, and professional lives