Review on Superconducting Materials

Short review of the topical comprehension of the superconductor materials classes Cuprate High-Temperature Superconductors, other oxide superconductors, Iron-based Superconductors, Heavy-Fermion Superconductors, Nitride Superconductors, Organic and other Carbon-based Superconductors and Boride and Borocarbide Superconductors, featuring their present theoretical understanding and their aspects with respect to technical applications.Comment: A previous version of this article has been published in \" Applied Superconductivity: Handbook on Devices and Applications \", Wiley-VCH ISBN: 978-3-527-41209-9. The new extended and updated version will be published in \" Encyclopedia of Applied Physics \", Wiley-VC

Post-Processing and Characterization of Additive Manufactured Carbon Fiber Reinforced Semi-Crystalline Polymers

The aim of this work is to study the effect of post-processing on additive manufactured (AM) continuous carbon fiber reinforced plastics (CFRPs) performance. As-printed AM CFRPs do not perform as well as conventionally manufactured CFRPs with the same composition. Possible improvements to AM CFRP performance include annealing and applying uniaxial pressure with elevated temperature. Samples were subjected to pressure and temperature treatments and annealing at a constant temperature. Treated materials were subjected to three-point bending tests, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) to characterize and assess sample performance. Results were assessed for flexural strength, flexural modulus, void content, fiber content, and layer thickness. Increased temperature combined with pressure in post-processing resulted in higher flexural modulus, higher maximum flexural stress, and decreased void content. Void content decreased with increasing temperature and pressure

Agricultural UAVs - A Case Study on Their Implementation in the US Market

The use of UAVs in agriculture represents a new market ready for explosive domestic growth, and could even be a game changer. Like the PC industry, many military funded technologies have been combined in products that are now just sold as a niche novelty for hobbyists. The agricultural UAV industry is near the point where the market can shift from this hobbyist, smallscale into an agricultural necessity, much like the PC industry shifted when IBM and its PC came onto the scene. Many small companies (and divisions of larger ones) are working on the use of drones in agriculture, but face unique regulatory challenges. This paper explores this budding agricultural UAV market, compares existing agricultural solutions, examines the technologies behind this new market, the regulations constraining this technology, and includes an evaluation of the field’s economic and technological likely future

Relationship between the family APGAR and behavioral problems in children

Objectives: to assess the use of the Family APGAR instrument as a supplement to usual clinical methods for the detection of psychosocial problems in children and to evaluate the relationship between the Family APGAR and physician diagnosis and elevated Child Behavior Checklist (CBCL) scores.Design: cross-sectional.Setting: ambulatory care center of a community-based, university-affiliated family medicine training program.Subject: one hundred fifty-two parents of children aged 3 to 16 years.Main outcome measures: family functioning was considered poor if Family APGAR scores were 5 or less. For the CBCL, sum total T scores greater than the 90th percentile for nonreferred children were considered clinically significant. Physicians used a checklist to indicate the presence of psychosocial problems or family dysfunction.Results: agreement between the Family APGAR scores and the physician's detection of child psychosocial problems was weak (kappa = 0.23). There was no relationship between the Family APGAR scores and physician perception of family dysfunction (kappa = -0.05). Although agreement between the Family APGAR and CBCL classifications was weak (kappa = 0.20), families with low Family APGAR scores were more than twice as likely to have children with clinically significant CBCL scores than those with higher scores (risk ratio = 2.08; 95% confidence interval = 1.02 to 4.24).Conclusions: the relationships among the Family APGAR and CBCL scores and physician detection of child psychosocial problems were weak. Child psychosocial problems were more than twice as likely to be present when the Family APGAR score was low. These findings suggest that family functioning is related to child psychosocial problems, but that the Family APGAR may not improve screening for child psychosocial problem