The capability of a proportional-type lateral control system in providing aerodynamic heading-angle trajectory control during reentry

Capability of lateral control system to provide aerodynamic heading-angle control of vehicle having maximum lift-drag ratio during reentr

An analytical investigation of a simplified thrust-vector orientation technique for establishing lunar orbits

Simplified thrust vector orientation technique for establishing lunar orbit

Crisis Management: Addressing the Impact of Insufficient Resources and Supports on Middle School Students\u27 Mental Health

This Dissertation-in-Practice (DiP) addresses a problem of practice which is an urgent need for enhanced mental health supports at Alpine Prairie Middle School (APMS) within the Western Canadian School District (WCSD). Amidst resource and budgetary constraints, this study explores holistically informed strategies grounded in the principal\u27s positionality and grounded by critical theory. This DiP focusses on transformative and distributed leadership approaches, considering the school as a complex adaptive system. A leadership framework integrates critical theory, transformative leadership, distributed leadership, and pragmatism to effectively lead the change process. The implementation plan includes a four-step change model: awakening, mobilization, acceleration, and institutionalization, tailored for APMS. This model aligns the organization with changes involving mental health literacy (MHL) and transformative social emotional learning (tSEL), managing the transition smoothly. Comprehensive communication and evaluation plans ensure successful integration of change strategies into the school\u27s operations, supporting and improving students\u27 mental health. Adopting a holistic approach, emphasizing equity, diversity, inclusion, and decolonization (EDID), this DiP describes a supportive and resilient environment where every student can thrive. This DiP also emphasizes the importance of a proactive stance on student mental health, the need for ongoing professional development for educators, and the value of involving the entire school community in mental health initiatives. By addressing these critical areas, the DiP seeks to create a more inclusive and supportive educational environment for all students at APMS. The findings may also inform future initiatives to improve mental health supports in middle schools

Letter From Scott Sparrow

I agree that it’s time we tackled the question of the advisability of promoting widespread lucid dream induction. It’s somewhat surprising that a more heated debate hasn’t sprung up before now. But now that lucid dreaming has been established as a legitimate focus of research enquiry, and has been found to be available to a large percentage of the populace, it’s certainly time to ask, "What is the appropriate context in which to encourage lucid dream induction?" With regard to this question, I’m going to share some ideas without going back to arrange them. I know if I try to do that, I’ll never find the time to finish a letter to you. So please forgive the disjointed nature of this response

No-till Forage Establishment in Alaska

We assessed the effectiveness of no-till forage establishment at six Alaska locations: Anchor Point, Sterling, Point MacKenzie, Palmer, Delta Junction, and Fairbanks. Directly seeding grass into established grass stands generally did not improve forage yields or quality. Seeding rate had little effect on establishment of newly seeded forages in no-till. Grass yields were depressed when companion crop yields were high, and they typically did not recover in subsequent years. Red clover established well, producing high yields of good quality forage under no-till at Point MacKenzie, but established poorly at Anchor Point and Delta Junction. These results indicated that no-till seeding of most forage crops into declining grass stands is not likely to be successful in Alaska with current available technology

Comparison of X-ray and gamma-ray dose-response curves for pink somatic mutations in Tradescantia clone 02

Microdosimetric data indicate that the mean specific energy,zeta, produced by individual charged particles from X rays and gamma rays is different for the two radiation qualities by nearly a factor of two. In order to test whether this influences the initial, linear component in the dose-effect relations, a comparison was made between dose-response curves for pink somatic mutations inTradescantia clone 02 stamen hairs following X and gamma irradiations. Absorbed doses ranged from 2.66 to 300 rad. The results are in agreement with predictions made on the basis of microdosimetric data. At low doses gamma rays are substantially less effective than X rays. The RBE of gamma rays vs. X rays at low doses was approximately 0.6, a value lower than those usually reported in other experimental systems

Plasma As A High-charge-state Projectile Stripping Medium

The classical trajectory Monte Carlo model has been used to computationally study the charge-state distributions that result from interactions between a high-energy, multielectron projectile and neutral and fully ionized targets. These studies are designed to determine the properties of a plasma for producing highly stripped ions as a possible alternative to gas and foil strippers that are commonly used to enhance the charge states of energetic ion beams. The results of these studies clearly show that a low-atomic-number, highly ionized plasma can yield higher charge states than a neutral target of the same density. The effect is principally attributable to the reduction in the number of available electron-capture channels. In this article, we compare the charge-state distributions that result during passage of a 20-MeV Pb projectile through neutral gas and fully ionized (singly charged) plasma strippers and estimate the effects of multiple scattering on the quality of the beam. © 1992 The American Physical Society

Scaling and synchronization in a ring of diffusively coupled nonlinear oscillators

Chaos synchronization in a ring of diffusively coupled nonlinear oscillators driven by an external identical oscillator is studied. Based on numerical simulations we show that by introducing additional couplings at $(mN_c+1)$-th oscillators in the ring, where $m$ is an integer and $N_c$ is the maximum number of synchronized oscillators in the ring with a single coupling, the maximum number of oscillators that can be synchronized can be increased considerably beyond the limit restricted by size instability. We also demonstrate that there exists an exponential relation between the number of oscillators that can support stable synchronization in the ring with the external drive and the critical coupling strength $\epsilon_c$ with a scaling exponent $\gamma$. The critical coupling strength is calculated by numerically estimating the synchronization error and is also confirmed from the conditional Lyapunov exponents (CLEs) of the coupled systems. We find that the same scaling relation exists for $m$ couplings between the drive and the ring. Further, we have examined the robustness of the synchronous states against Gaussian white noise and found that the synchronization error exhibits a power-law decay as a function of the noise intensity indicating the existence of both noise-enhanced and noise-induced synchronizations depending on the value of the coupling strength $\epsilon$. In addition, we have found that $\epsilon_c$ shows an exponential decay as a function of the number of additional couplings. These results are demonstrated using the paradigmatic models of R\"ossler and Lorenz oscillators.Comment: Accepted for Publication in Physical Review

Generating samples of extreme winters to support climate adaptation

Recent extreme weather across the globe highlights the need to understand the potential for more extreme events in the present-day, and how such events may change with global warming. We present a methodology for more efficiently sampling extremes in future climate projections. As a proof-of-concept, we examine the UK’s most recent set of national Climate Projections (UKCP18). UKCP18 includes a 15-member perturbed parameter ensemble (PPE) of coupled global simulations, providing a range of climate projections incorporating uncertainty in both internal variability and forced response. However, this ensemble is too small to adequately sample extremes with very high return periods, which are of interest to policy-makers and adaptation planners. To better understand the statistics of these events, we use distributed computing to run three 1000-member initial-condition ensembles with the atmosphere-only HadAM4 model at 60km resolution on volunteers’ computers, taking boundary conditions from three distinct future extreme winters within the UKCP18 ensemble. We find that the magnitude of each winter extreme is captured within our ensembles, and that two of the three ensembles are conditioned towards producing extremes by the boundary conditions. Our ensembles contain several extremes that would only be expected to be sampled by a UKCP18 PPE of over 500 members, which would be prohibitively expensive with current supercomputing resource. The most extreme winters we simulate exceed those within UKCP18 by 0.85 K and 37% of the present-day average for UK winter means of daily maximum temperature and precipitation respectively. As such, our ensembles contain a rich set of multivariate, spatio-temporally and physically coherent samples of extreme winters with wide-ranging potential applications