179,964 research outputs found
Factors Associated to Purchase of Quality-Labelled Beef
No full textThe aim of the present study is to identify the factors associated to purchase of quality-labelled beef. For this purpose a total of 364 surveys were carried out on buyers of beef in three Spanish cities. The sample was divided into three groups of buyers according to the beef purchasing habits with a quality label. A logistic regression analysis was used to estimate the differences between groups. The results show the importance of the production region as a quality aspect. Income level, association of quality-labelled beef with “guarantee and tradition” aspects, purchasing frequency, place of purchase, production systems and lifestyles are all variables that enabled us to establish differences between groups.beef quality, quality label, consumer perception, Demand and Price Analysis,
Topical chemotherapy for ocular surface squamous neoplasia: current status.
No full textBr J Ophthalmol. 2010 May;94(5):532-5. Epub 2009 Sep 23.
Topical chemotherapy for ocular surface squamous neoplasia: current status.
Sepulveda R, Pe'er J, Midena E, Seregard S, Dua HS, Singh AD.
SourceDepartment of Ophthalmic Oncology, Cole Eye Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, USA.
Abstract
Although there are no randomised trials directly comparing topical chemotherapeutic agents mitomycin-C, 5-fluorouracil, and interferon-alpha2b, published studies indicate equal efficacy of these agents for treatment of non-invasive ocular surface squamous neoplasia (80%-88%). 5-Fluorouracil may be preferred, given low incidence of serious side effects and low cost to the patient.
PMID: 19776089 [PubMed - indexed for MEDLINE
Artificial intelligence and liver transplantation: looking inside the Pandora’s box
No full textArtificial intelligence (AI) is the discipline of computer science dedicated to processing a large amount of throughput data and is based on algorithms that can rationalize increasingly complex tasks and ultimately reproduce human intelligence. It has been speculated for clinical uses in liver transplantation (LT) for several years, but its application remains incipient worldwide. Therefore, the recent advancements of digital and robotic tools in daily medical practice make the modern environment propitious to its proper implementation. Nevertheless, it is noteworthy that this technology has significant limitations: (i) its unconditional dependence on a pre-established reliable and extensive database; (ii) the potential impact on independent medical decision-making; and (iii) a major economic and environmental burden. So, despite its seducing and flawless simplicity features, AI emerges as a new “Pandora’s box” that should be carefully understood and used under the light of ethical principles to improve clinical outcomes, promote medical and para-medical working conditions, and increase patient safety and access to medical care. The present work aims to review literature data supporting AI implementation on this basis
Aerodynamic modeling and assessment of flaps for hypersonic trajectory control of blunt bodies
No full textIndependently articulated aerodynamic flaps on a blunt-body entry vehicle may provide a feasible alternative to current state-of-the-art bank-angle steering control while introducing additional benefits during entry, descent, and landing. Flaps provide direct control of the vehicle’s lift and drag vectors, eliminating the need for a center of gravity offset and enabling a relatively constant vehicle attitude. A near-constant attitude may allow the use of relative navigation sensors and regional-scale science instruments during the hypersonic portion of entry. Direct aerodynamic vector control also enables active regulation of heating and reduces or eliminates the need for a reaction control system in the hypersonic regime.
The Configuration-Based Aerodynamics tool was used to predict the trim angle of attack, trim lift-to-drag ratio, lift coefficients, and drag coefficients for variations in the number of flaps, individual flap configurations, and deployment angles. Aerodynamic data is validated against static trim-tab data from the literature. Results for one flap above the entry vehicle are presented for the hypersonic regime with the angle of attack ranging from -4 degrees to 20 degrees. These results demonstrate the effects of a flap on the aerodynamic performance of an entry vehicle and will inform the development of guidance, navigation, and control systems for various flap configurations on entry vehicles.Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-09-29 without embargo termsThe student, Jose Sepulveda, accepted the attached license on 2017-07-20 at 23:19.The student, Jose Sepulveda, submitted this Thesis for approval on 2017-07-20 at 23:27.This Thesis was approved for publication on 2017-07-21 at 08:46.DSpace SAF Submission Ingestion Package generated from Vireo submission #11569 on 2017-09-29 at 11:32:27Made available in DSpace on 2017-09-29T17:57:12Z (GMT). No. of bitstreams: 3
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Previous issue date: 2017-07-2
Supplementary Tables: S1-S6 (Sepulveda et al. mBio 2017)
No full textSupplementary Tables: S1-S6 (Sepulveda et al. mBio 2017
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
The Leading Edge: A Case Study on Collaboration and Leadership Frameworks on Four NASA Space Missions
No full text2025Over the last 70 years, humanity has continued to push the boundaries of exploration in outer space. While this initial race for space began in an antagonistic fashion between superpowers, over time, space exploration has become a collaborative effort among nations and an industry unto itself. The globalized economy, coupled with satellite research and communications stations, has encouraged nearly half of Earth’s nations to create space agencies. Collaboration between teams, from within an agency or through joint missions, brings together not only experts in their field but also diverse backgrounds and cultures. For this research, we utilize a comparative case study approach on four NASA spaceflight missions, seeking themes of collaboration and leadership, and discuss the outcome of these missions
Development and validation of an eating disorders symptom impact scale (EDSIS) for carers of people with eating disorders
No full textBackground: Family members of relatives with eating disorders experience high levels of distress due to the difficulties in their care giving role. However no measures have been developed to measure the specific impact that an individual with an eating disorder has on family life. The aim of this study was to develop a measure to assess the specific caregiving burden of both anorexia nervosa and bulimia nervosa. A secondary aim was to examine whether this measure was sensitive to change.Methods: A new scale, the Eating Disorders Symptom Impact Scale (EDSIS), was generated by a panel of clinicians and researchers based upon quantitative and qualitative work with carers and reviewed by a panel of "expert carers". A cross-sectional study was conducted among carers of relatives with an eating disorder to examine the properties of the new scale. In addition, participants from an ongoing pre-and-post design study completed several self-report questionnaires to assess the sensitivity of the EDSIS to change.Results: A sample of 196 carers of relatives with an eating disorder aged 25–68 compted the scale. A 24-item EDSIS scale was derived with four factors: nutrition, guilt, dysregulated behaviour and social isolation. These explained 58.4% of the variance in carer distress. Reliability was acceptable (Cronbach's alpha ranged from 0.84 to 0.90). The convergent validity of the EDSIS subscales was moderately supported by correlations with a general caregiving measure (Experience of Caregiving Inventory (ECI), r = 0.42 to 0.60), psychological distress (General Health Questionnaire (GHQ-12), r = 0.33) and perceived functioning of the relative (Children Global Assessment Scale (CGAS), r = -30). A sample of 57 primary caregivers completed pre-post intervention assessments and the overall scale (t = 2.3, p < 0.05) and guilt subscale (t = 3.4, p < 0.01) were sensitive to change following a skills training workshop.Conclusion: The EDSIS instrument has good psychometric properties and may be of value to assess the impact of eating disorder symptoms on family members. It may be of value to highlight carers' needs and to monitor the effectiveness of family based interventions
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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