Flavor symmetry breaking effects on SU(3) Skyrmion

We study the massive SU(3) Skyrmion model to investigate the flavor symmetry breaking (FSB) effects on the static properties of the strange baryons in the framework of the rigid rotator quantization scheme combined with the improved Dirac quantization one. Both the chiral symmetry breaking pion mass and FSB kinetic terms are shown to improve $c$ the ratio of the strange-light to light-light interaction strengths and $\bar{c}$ that of the strange-strange to light-light.Comment: 12 pages, latex, no figure

Pathways to Careers in Health Care

The Patient Protection and Affordable Care Act passed by Congress and signed into law by President Barack Obama in 2010 effected major changes in the financing and delivery of health care in the United States. It also authorized creation of the Health Profession Opportunity Grants program (HPOG), a demonstration effort within the U.S. Department of Health and Human Services to provide opportunities for education and training that lead to jobs and career advancement in health care for recipients of Temporary Assistance for Needy Families (TANF) and other low-income individuals and to respond to the increasing demand for health care professionals. As a demonstration program, HPOG also featured a mandated federal evaluation to assess its success and a corresponding research program—the HPOG University Partnership Research Grants (HPOG UP), a collaborative effort between the program operators and academic researchers from different disciplines—to observe various aspects of its operations. HPOG unites two important innovations in workforce development programming for serving low-income populations in recent decades, career pathways and sector strategies, by actively fostering the use of the former in the context of one major sector—health care. Health care is one of the only sectors that continued to exhibit growth year after year in periods of general economic expansion as well as decline. Health care employment even continued to expand in most states and communities across the United States through the Great Recession in 2008–2009. In addition to offering insights into these strategies and their evolution, the authors in this book present the findings, lessons, and recommendations that emanated from HPOG research and evaluations for consideration by policymakers, program operators, and other researchers.https://research.upjohn.org/up_press/1279/thumbnail.jp

Strong correlation effects in the doped Hubbard model in infinite dimensions

The density of states and the optical conductivity of the doped Hubbard model on a Bethe lattice with infinite connectivities have been studied using an analytic variant of the Lanczos continued fraction method. The spectral weight of the gap states and the position of the chemical potential upon hole or electron doping have been studied. We argue that the strong correlation effects such as gap states and midinfrared band shown in two dimensions also appear in infinite dimensions.Comment: 9 pages, revtex, 3 figures upon reques

Sub-nanosecond signal propagation in anisotropy engineered nanomagnetic logic chains

Energy efficient nanomagnetic logic (NML) computing architectures propagate and process binary information by relying on dipolar field coupling to reorient closely-spaced nanoscale magnets. Signal propagation in nanomagnet chains of various sizes, shapes, and magnetic orientations has been previously characterized by static magnetic imaging experiments with low-speed adiabatic operation; however the mechanisms which determine the final state and their reproducibility over millions of cycles in high-speed operation (sub-ns time scale) have yet to be experimentally investigated. Monitoring NML operation at its ultimate intrinsic speed reveals features undetectable by conventional static imaging including individual nanomagnetic switching events and systematic error nucleation during signal propagation. Here, we present a new study of NML operation in a high speed regime at fast repetition rates. We perform direct imaging of digital signal propagation in permalloy nanomagnet chains with varying degrees of shape-engineered biaxial anisotropy using full-field magnetic soft x-ray transmission microscopy after applying single nanosecond magnetic field pulses. Further, we use time-resolved magnetic photo-emission electron microscopy to evaluate the sub-nanosecond dipolar coupling signal propagation dynamics in optimized chains with 100 ps time resolution as they are cycled with nanosecond field pulses at a rate of 3 MHz. An intrinsic switching time of 100 ps per magnet is observed. These experiments, and accompanying macro-spin and micromagnetic simulations, reveal the underlying physics of NML architectures repetitively operated on nanosecond timescales and identify relevant engineering parameters to optimize performance and reliability.Comment: Main article (22 pages, 4 figures), Supplementary info (11 pages, 5 sections

Meson Exchange Effect on Color Superconductivity

We investigate the effects of pion and gluon exchanges on the formation of two-flavor color superconductivity at moderate density, $\mu <1 GeV$. The chiral quark model proposed by Manohar and Georgi containing pions as well as gluons is employed to show that the pion exchange reduces substantially the value of the superconducting gap gotten with the gluon exchange only. It turns out that the pion exchanges produce a repulsion between quark-quark pair in a spin and isospin singlet state. We suggest that the phase consisiting of pions, gluons and quarks is one of the candidates of in-medium QCD phase at moderate density.Comment: 8 pages, 1 figure, minor correction

The radio counter-jet of the QSO 3C~48

We present multi--frequency radio observational results of the quasar 3C~48. The observations were carried out with the Very Large Array (VLA) at five frequencies of 0.33, 1.5, 4.8, 8.4, and 22.5 GHz, and with the Multi--Element Radio Linked Interferometer Network (MERLIN) at the two frequencies of 1.6 and 5 GHz. The source shows a one--sided jet to the north within 1\arcsec, which then extends to the northeast and becomes diffuse. Two bright components (N2 and N3), containing most of the flux density are present in the northern jet. The spectral index of the two components is $\alpha_{N2}\sim-0.99\pm0.12$ and $\alpha_{N3}\sim-0.84\pm0.23$ ($S\propto\nu^{\alpha}$). Our images show the presence of an extended structure surrounding component N2, suggestive of strong interaction between the jet and the interstellar medium (ISM) of the host galaxy. A steep--spectrum component, labelled as S, located 0.25 ardsec southwest to the flat--spectrum component which could be the core of 3C 48, is detected at a significance of $>15\sigma$. Both the location and the steepness of the spectrum of component S suggest the presence of a counter--jet in 3C 48.Comment: 7 pages, 6 figures, accepted by A&

Mapping Quality of Life in Nebraska: Migration Rates

KEY POINTS AND IMPLICATIONS Nebraska is a state that is not often viewed as affected significantly by mobility and migration. As a state, the net migration rate of 1.1 from 2015 to 2016 is fairly low compared to others like Florida (16.0) or Nevada (14.4). However, data from this report suggests that there is, in fact, substantial movement of people moving in and moving out; as well as pockets within the state where there is higher than average influx of both domestic and international migrants. In general, migration trends in the state mirror national trends of “rural flight” where people are moving out of the rural counties and moving into suburban or metropolitan areas. In fact, 69 of the 93 counties had a negative net migration. This is most likely due to greater economic opportunities associated with urban areas (Harris & Todaro, 1970). However, the population leaving is being offset by international migrants who do come to suburban and rural counties (e.g., Colfax, Dakota, Dawson). Thus, overall the state net migration rate has been minimal with a slight increase. Below are other key points of this fact sheet. • The foreign-born population is highest in the metropolitan counties, particularly in Douglas (48,909) and in Lancaster (21,888). However, the highest concentration of foreign-born is found in micropolitan areas with lower overall population (i.e., at least 10,000 but less than 50,000), such as Dakota, Dawson, and Hall. Most likely, specific industries (e.g., meatpacking plants, industrial plants) in these areas are attracting migrant workers. This is consistent with recent scholars’ recognition of the importance of micropolitan areas in economic and social revitalization of states (e.g., Cantrell, 2007). • The maps of overall net migration rates and domestic migration rates are almost identical. This suggests that domestic migration accounts for much of the population change compared to international migration. Nonetheless, caution must be used in interpreting this pattern. In fact, it may seem that Nebraska has few international migrants. However, international migrants are counted as domestic migrants when they moved within the state in the last 12 months. Thus, it is important to note that the numbers of international migrants are not similar to the numbers of the foreign-born population. • Counties with high numbers of international migrants, particularly the metropolitan areas in the southeast part of the state, also have high numbers of ethnic minorities (e.g., Douglas, Lancaster, Sarpy). Although there are migrants from all over the world who come to Nebraska, the numbers suggest that most of the migrants identify as ‘ethnic minorities’ or non-White (see Population Distribution by Race, Ethnicity, and Age by Taylor et al., 2017). • International migrants are a diverse group and come to Nebraska for different reasons, such as to work and/or to study. The numbers presented above also include refugees, individuals who have been forced to leave their country to escape war, persecution, or natural disaster. Approximately 5,415 refugees from FY 2000 to FY 2010, and 818 refugees in FY 2010 settled in Nebraska. Additionally, as the census does not ask for immigration status, the migration rates and foreign-born population may also include undocumented immigrants, foreign-born individuals who do not have a legal right to live or remain in the country. Overall, this report presents the migration rates and foreign-born population in Nebraska. Data and information in this report intend to inform policymakers and practitioners as they design guidelines and services that are sensitive to current migration trends and responsive to the characteristics of the population

Mapping Quality of Life in Nebraska: Population Distribution by Race, Ethnicity, and Age

KEY POINTS This section details key points from the data on racial, ethnic, and age groups across Nebraska. RACIAL AND ETHNIC MINORITIES IN NEBRASKA • The proportions of Nebraska’s racial and ethnic minority populations tend to be smaller by 4% (i.e., Asian) to 8% (i.e., Black or African American, Hispanic/Latino) than those of the US, except for the Hawaiian and Pacific Islander and American Indian and Alaska Native populations (i.e., smaller only by 0.1% to 0.2%). • Nebraska’s urban areas, which comprise 73.1% of the Nebraska population, have higher numbers of racial and ethnic minorities than suburban or rural areas. However, when the relative concentration of racial and ethnic minorities is taken into account, many of the lowest populated counties often have the highest relative concentrations of racial and ethnic minority groups, particularly Hawaiian and Pacific Islanders, American Indian and Alaska Natives, and Hispanic/Latinos, compared to the other counties. • Counties across the central part of the state, as well as the northeast corner, tend to have the highest relative concentrations of racial and ethnic minorities. NEBRASKA YOUNG CHILD AND YOUTH POPULATIONS • Counties in northeast Nebraska have the highest relative concentrations of young children and youth compared to the relative number of young children and youth in the entire state. • Other counties with high relative concentrations of young children and youth tend to be the state’s higher populated counties. NEBRASKA ELDERLY POPULATION • Counties with higher relative elderly concentrations tend to be in rural areas, specifically in western Nebraska and along the Nebraska-Kansas border. • Counties with high relative elderly concentrations tend to be counties with lower relative concentrations of young child and youth populations. INTERSECTIONS OF NEBRASKA RACIAL, ETHNIC, AND AGE GROUPS • Counties with high relative concentrations of young children and youth tend to be the ones that also have high relative concentrations of racial and ethnic minority populations, specifically Hispanic/Latinos and American Indian and Alaska Natives (e.g., Thurston, Platte, Colfax, Dakota, and Dawson counties). • Most counties in Nebraska with high racial/ ethnic minority concentrations have lower relative elderly concentrations, suggesting a low relative concentration of minority elders in these counties