On the application of radio frequency voltages to ion traps via helical resonators

Ions confined using a Paul trap require a stable, high voltage and low noise radio frequency (RF) potential. We present a guide for the design and construction of a helical coil resonator for a desired frequency that maximises the quality factor for a set of experimental constraints. We provide an in-depth analysis of the system formed from a shielded helical coil and an ion trap by treating the system as a lumped element model. This allows us to predict the resonant frequency and quality factor in terms of the physical parameters of the resonator and the properties of the ion trap. We also compare theoretical predictions with experimental data for different resonators, and predict the voltage applied to the ion trap as a function of the Q-factor, input power and the properties of the resonant circuit

Aviation Psychology: Cognition and Personality

This study has two main objectives. The first is to measure the personality traits of aviation students at EKU. Recent research indicates the existence of a distinct pilot personality profile, characterized by heightened emotional stability and conscientiousness compared to the general population. The current study will evaluate aviation students at EKU and see how they compare to that specific profile. The second objective is to evaluate aviation students\u27 confidence in their visual abilities during flight and to see whether certain interventions can help them better calibrate their confidence with their actual abilities. Awareness of cognitive limitations is vital for pilots as failure to recognize them can lead to catastrophic consequences. Results will be analyzed to determine the relationship between personality traits, aviation outcomes, and perceptions of visual awareness. Findings from this study could inform aviation instructors, advisors, and others about the role of personality in aviation education and the efficacy of interventions targeting perceptual limitations. This integrated approach aims to enhance aviation training by addressing both individual differences and perceptual challenges encountered in real-world aviation settings

In-Class Versus At-Home Quizzes: Which is Better? A Flipped Learning Study in a Two-Site Synchronously-Broadcast Organic Chemistry Course

We recently shared our design of a two-semester flipped organic chemistry course, in which we gave students in-class quizzes to incentivize attendance and watching the lecture videos in advance. With a second iteration, we planned to make the video-watching experience more engaging. We accordingly hypothesized that if students completed short at-home quizzes while watching the videos, then attentiveness, engagement, and learning would increase. We tested this with a later section of the course, dividing the material into 13 units. For units 1-6, we gave in-class quizzes; for 7-13, quizzes were at home. Although units 1-6 and 7-13 covered different material, we were nonetheless surprised when students’ average quiz scores decreased for the take-home quizzes, because they did not have a time limit and were open-book, unlike the in-class quizzes. Anonymous survey feedback showed a strong preference for quizzes in class and indications that take-home quizzes demotivated attendance and pre-class watching of the videos. Thus, for analogous flipped course designs in chemistry, we recommend an in-class quizzing strategy over take-home quizzes to positively affect engagement, learning, and attendance. Of note, this course was synchronously delivered to two groups of students at geographically-distinct satellite locations

The changing patterns of group politics in Britain

Two interpretations of ways in which group politics in Britain have presented challenges to democracy are reviewed: neo-corporatism or pluralistic stagnation and the rise of single issue interest groups. The disappearance of the first paradigm created a political space for the second to emerge. A three-phase model of group activity is developed: a phase centred around production interests, followed by the development of broadly based 'other regarding' groups, succeeded by fragmented, inner directed groups focusing on particular interests. Explanations of the decay of corporatism are reviewed. Single issue group activity has increased as party membership has declined and is facilitated by changes in traditional media and the development of the internet. Such groups can overload the policy-making process and frustrate depoliticisation. Debates about the constitution and governance have largely ignored these issues and there is need for a debate

Unemployment, Education and Skills Constraints in Post-Apartheid South Africa

This paper investigates the relationship between education and unemployment in post-apartheid South Africa, and probes the argument that employment growth has been inhibited particularly by skills constraints. We use probit regression analysis to show that higher education protected against unemployment in both 1995 and 2003, and that overall, the relative benefits to tertiary education rose over the period

Integrating Weight Bias Awareness and Mental Health Promotion Into Obesity Prevention Delivery: A Public Health Pilot Study

Abstract Introduction Promoting healthy weight is a top priority in Canada. Recent federal guidelines call for sustained, multisectoral partnerships that address childhood obesity on multiple levels. Current healthy weight messaging does not fully acknowledge the influence of social determinants of health on weight