The Health and Wealth of a Nation: Employer-Based Health Insurance and the Affordable Care Act

This research examines the behaviors of firms with respect to their provision of health care prior to the Affordable Care Act (ACA) deliberations and uses those behaviors to assess changes in employer-sponsored health insurance that might occur once the ACA is fully implemented.https://research.upjohn.org/up_press/1235/thumbnail.jp

Low-Skilled Jobs: The Reality behind the Popular Perceptions

Maxwell presents the results of a survey of 405 employers, which queried them about jobs requiring no more than a high school education and no more than one year of work experience. These data allow her to establish the link between skills and low-skilled jobs and to reveal the current state of the labor market facing low-skilled workers. The data also highlights the knowledge and skills that employers require in low-skilled jobs and the abilities that individuals who apply for those jobs bring to the table.https://research.upjohn.org/up_press/1035/thumbnail.jp

The Working Life: The Labor Market for Workers in Low-Skilled Jobs

Maxwell presents the results of a survey of 405 employers, which queried them about jobs requiring no more than a high school education and no more than one year of work experience. These data allow her to establish the link between skills and low-skilled jobs and to reveal the current state of the labor market facing low-skilled workers. The data also highlights the knowledge and skills that employers require in low-skilled jobs and the abilities that individuals who apply for those jobs bring to the table.https://research.upjohn.org/up_press/1035/thumbnail.jp

High School Career Academies: A Pathway to Education Reform in Urban School Districts?

Maxwell and Rubin examine the capacity of career academies to address academic reform in terms of increased education and workplace skills. They accomplish this on two levels. First, they assess academies\u27 development and implementation within an urban school district. Then they assess academies\u27 potential to promote postsecondary success among academy students as compared to nonacademy students. Their findings will help educators and policymakers better understand the strengths and limitations of this method of reform.https://research.upjohn.org/up_press/1061/thumbnail.jp

The Effectiveness of Problem-Based Instruction: A Comparative Study of Instructional Methods and Student Characteristics

This study compared the effectiveness of problem-based learning (PBL) and traditional instructional approaches in developing high-school students’ macroeconomics knowledge and examined whether PBL was differentially effective with students demonstrating different levels of four aptitudes: verbal ability, interest in economics, preference for group work, and problem-solving efficacy. Over all, PBL was found to be a more effective instructional approach for teaching macroeconomics than traditional lecture–discussion (p = .05). Additional analyses provided evidence that PBL was more effective than traditional instruction with students of average verbal ability and below, students who were more interested in learning economics, and students who were most and least confident in their ability to solve problems

Effect of particle size on the thermal conductivity of nanofluids containing metallic nanoparticles

A one-parameter model is presented for the thermal conductivity of nanofluids containing dispersed metallic nanoparticles. The model takes into account the decrease in thermal conductivity of metal nanoparticles with decreasing size. Although literature data could be correlated well using the model, the effect of the size of the particles on the effective thermal conductivity of the nanofluid could not be elucidated from these data. Therefore, new thermal conductivity measurements are reported for six nanofluids containing silver nanoparticles of different sizes and volume fractions. The results provide strong evidence that the decrease in the thermal conductivity of the solid with particle size must be considered when developing models for the thermal conductivity of nanofluids

Preparation and characterization of carbon nanofluid by a plasma arc nanoparticles synthesis system

Heat dissipation from electrical appliances is a significant issue with contemporary electrical devices. One factor in the improvement of heat dissipation is the heat transfer performance of the working fluid. In this study, we used plasma arc technology to produce a nanofluid of carbon nanoparticles dispersed in distilled water. In a one-step synthesis, carbon was simultaneously heated and vaporized in the chamber, the carbon vapor and particles were then carried to a collector, where cooling furnished the desired carbon/water nanofluid. The particle size and shape were determined using the light-scattering size analyzer, SEM, and TEM. Crystal morphology was examined by XRD. Finally, the characterization include thermal conductivity, viscosity, density and electric conductivity were evaluated by suitable instruments under different temperatures. The thermal conductivity of carbon/water nanofluid increased by about 25% at 50°C compared to distilled water. The experimental results demonstrated excellent thermal conductivity and feasibility for manufacturing of carbon/water nanofluids

A new heat propagation velocity prevails over Brownian particle velocities in determining the thermal conductivities of nanofluids

An alternative insight is presented concerning heat propagation velocity scales in predicting the effective thermal conductivities of nanofluids. The widely applied Brownian particle velocities in published literature are often found too slow to describe the relatively higher nanofluid conductivities. In contrast, the present model proposes a faster heat transfer velocity at the same order as the speed of sound, rooted in a modified kinetic principle. In addition, this model accounts for both nanoparticle heat dissipation as well as coagulation effects. This novel model of effective thermal conductivities of nanofluids agrees well with an extended range of experimental data

Genome-wide association and Mendelian randomisation analysis provide insights into the pathogenesis of heart failure

Heart failure (HF) is a leading cause of morbidity and mortality worldwide. A small proportion of HF cases are attributable to monogenic cardiomyopathies and existing genome-wide association studies (GWAS) have yielded only limited insights, leaving the observed heritability of HF largely unexplained. We report results from a GWAS meta-analysis of HF comprising 47,309 cases and 930,014 controls. Twelve independent variants at 11 genomic loci are associated with HF, all of which demonstrate one or more associations with coronary artery disease (CAD), atrial fibrillation, or reduced left ventricular function, suggesting shared genetic aetiology. Functional analysis of non-CAD-associated loci implicate genes involved in cardiac development (MYOZ1, SYNPO2L), protein homoeostasis (BAG3), and cellular senescence (CDKN1A). Mendelian randomisation analysis supports causal roles for several HF risk factors, and demonstrates CAD-independent effects for atrial fibrillation, body mass index, and hypertension. These findings extend our knowledge of the pathways underlying HF and may inform new therapeutic strategies