Can government policies increase national long-run growth rates?

We obtain time series estimates of the long run growth rates of 17 OECD countries, and test the hypothesis that these are the same across countries. We find that we cannot reject this hypothesis for the first and last three decades of the 20th century. We conclude that: (i) there are few, if any, feasible policies available that have a significant effect on long run growth rates, and; (ii) any policies that can raise national growth rates must be international in scope. The results therefore have bleak implications for the ability of countries to affect their long run growth rates.economic policy, technological change, convergence, economic growth

Directional Mobility of Ratings

In this paper we describe a method to decompose a well-known measure of debt ratings mobility into it’s directional components. We show, using sovereign debt ratings as an example, that this directional decomposition allows us to better understand the underlying characteristics of debt ratings migration and, for the case of the data set used, that the standard Markov chain model is not homogeneous in either the time or cross-sectional dimensions. We find that the directional decomposition also allows us to sign the change in quality of debt over time and across sub-groups of the population.Ratings migration, Mobility, Sovereign debt

PRESSURE-DRIVEN STABILIZATION OF CAPACITIVE DEIONIZATION

The effects of system pressure on the performance stability of flow-through capacitive deionization (CDI) cells was investigated. Initial data showed that the highly porous carbon electrodes possessed air/oxygen in the micropores, and the increased system pressure boosts the gases solubility in saline solution and carries them out of the cell in the effluent. Upon applying a potential difference to the electrodes, capacitive-based ion adsorption occurs in competition with faradaic reactions that consume oxygen. Through the addition of backpressure, the rate of degradation decreases, allowing the cell to maintain its salt adsorption capacity (SAC) longer. The removal of oxygen from the pore space of the electrodes makes it no longer immediately accessible to faradaic reactions, thus hindering the rate of reactions and giving the competing ion adsorption an advantage that is progressively seen throughout the life of the cell. A quick calculation shows that the energy penalty to power the pump is fairly insignificant, especially in comparison to the cost of replacing the electrodes in the cell. Thus, operating at elevated pressures is shown to be cost effective for continuous operation through the reduced electrode replenishment costs

Educators’ Perceptions of Student Mobility During the Intermediate Elementary Grades in Two Rural Counties in Missouri

Student mobility is “students moving from one school to another for reasons other than being promoted to the next school level” (Rumberger, 2002, p. 1). In this qualitative study, the researcher detailed how student mobility impacted four rural intermediate elementary schools in two select counties in southwest Missouri. Four principals, four counselors, and four classroom teachers were interviewed to learn how high student mobility impacted these participants, mobile and non-mobile students, and schools overall. There has been ample research on student mobility in the primary grades and in high school, but very little research exists dealing with intermediate elementary students. Many common perceptions among those interviewed arose after data were analyzed. Participants agreed highly mobile students were more likely to struggle academically and socially than stably enrolled peers. In addition, interviewees felt highly mobile student populations presented more difficulties for teachers and administrators to successfully educate all children. The need for more effective enrollment and new student orientation practices surfaced as means to minimize the negative effects of high student mobility in the studied schools. Also, the need for more efficient communication with parents of mobile students was highlighted. Schools in this area must find ways to streamline curriculum and procedures to provide shared mobile students the opportunity to find academic and behavioral success. Conclusions from this study may help school leaders better address the needs presented by a highly mobile student population

Exploring the Dynamics and Impacts of Failed Teamwork in the Flight Deck: A Case Study Analysis of Contributing Factors and Mitigation Strategies

Crew Resource Management (CRM) is a crucial concept in aviation, emphasizing the coordinated use of all available resources, including human, equipment, and information, to ensure safe and efficient flight operations. CRM aims to enhance communication, decision-making, and situational awareness among flight crew members, thus reducing errors, mitigating risks, and improving overall operational efficiency. The CRM competencies include leadership, teamwork, and decision-making. The National Transportation Safety Board has determined poor teamwork was a contributing factor of major aircraft accidents. This ongoing project aims to investigate the teamwork competency within the operational hierarchies of Part 121 and Part 135 operations by examining accidents that occurred between the years 2000 and 2022. The study will delve into the dynamics of teamwork within regulatory frameworks and previous literature to identify patterns, challenges, and potential areas for improvement. By understanding the intricacies of teamwork within these operational structures, the goal is to enhance safety standards to help mitigate risks in the aviation industry

Constructing topological models by symmetrization: A PEPS study

Symmetrization of topologically ordered wavefunctions is a powerful method for constructing new topological models. Here, we study wavefunctions obtained by symmetrizing quantum double models of a group $G$ in the Projected Entangled Pair States (PEPS) formalism. We show that symmetrization naturally gives rise to a larger symmetry group $\tilde G$ which is always non-abelian. We prove that by symmetrizing on sufficiently large blocks, one can always construct wavefunctions in the same phase as the double model of $\tilde G$. In order to understand the effect of symmetrization on smaller patches, we carry out numerical studies for the toric code model, where we find strong evidence that symmetrizing on individual spins gives rise to a critical model which is at the phase transitions of two inequivalent toric codes, obtained by anyon condensation from the double model of $\tilde G$.Comment: 10 pages. v2: accepted versio

Male Stress Urinary Incontinence: A Review of Surgical Treatment Options and Outcomes

Introduction and Objective. Iatrogenic male stress urinary incontinence (SUI) affects a percentage of men undergoing urologic procedures with a significant impact on quality of life. The treatment of male SUI has evolved significantly with multiple current options for treatment available. The current paper discusses preoperative evaluation of male SUI, available surgical options with reported outcomes, and postoperative complication management. Methods. A pubMed review of available literature was performed and summarized on articles reporting outcomes of placement of the artificial urinary sphincter (AUS) or male slings including the bone anchored sling (BAS), retrourethral transobturator sling (RTS), adjustable retropubic sling (ARS), and quadratic sling. Results. Reported rates of success (variably defined) for BAS, RTS, ARS, and AUS are 36–67%, 9–79%, 13–100%, and 59–91% respectively. Complications reported include infection, erosion, retention, explantation, and transient pain. Male slings are more commonly performed in cases of low-to-moderate SUI with decreasing success with higher degrees of preoperative incontinence. Conclusions. An increasing number of options continue to be developed for the management of male SUI. While the AUS remains the gold-standard therapy for SUI, male sling placement is a proven viable alternative therapy for low-to-moderate SUI

Practical learning method for multi-scale entangled states

We describe a method for reconstructing multi-scale entangled states from a small number of efficiently-implementable measurements and fast post-processing. The method only requires single particle measurements and the total number of measurements is polynomial in the number of particles. Data post-processing for state reconstruction uses standard tools, namely matrix diagonalisation and conjugate gradient method, and scales polynomially with the number of particles. Our method prevents the build-up of errors from both numerical and experimental imperfections

Community Teaching Experience: A Description of the Development and Design of a Unique Teaching Experience for Occupational Therapy Doctoral Students

Entry-level occupational therapy doctorate (OTD) students receive education and training to interpret and disseminate evidenced-based literature. However, these students are often missing the clinical experience to identify clinically relevant questions that impact occupational outcomes. Conversely, occupational therapy practitioners have the clinical experience to determine clinically appropriate questions but often encounter time, budget, and setting constraints on researching and learning up-to-date evidence-based practice assessment and intervention techniques. The purpose of this paper is to describe the development and design of an exploratory educational project in which OTD students utilized clinically relevant questions identified by local occupational therapy practitioners to disseminate evidence-based literature in the form of continuing competency in-services to clinicians as it related to their clinical practice setting. Nineteen sites participated and 33 one-hour presentations were presented to clinical sites in the local area and within the occupational therapy student body. Students reflected that this was a positive learning experience and a valuable component of the course