630 research outputs found

    Failure to Protect: Why the Individual Insurance Market Is Not a Viable Option for Most U.S. Families

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    Based on the Commonwealth Fund 2007 Biennial Health Insurance Survey, examines access to and affordability of individual insurance. Reviews obstacles to obtaining coverage, such as health issues and costs, and out-of-pocket costs of those who obtain it

    Squeezed: Why Rising Exposure to Health Care Costs Threatens the Health and Financial Well-Being of American Families

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    Examines U.S. healthcare costs compared with other industrialized countries, individual health insurance coverage, individual market regulations, and the impact of high deductible plans on the health of individuals with chronic disease

    Extending the Globular Cluster System-Halo Mass Relation to the Lowest Galaxy Masses

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    High mass galaxies, with halo masses M200≥1010M⊙M_{200} \ge 10^{10} M_{\odot}, reveal a remarkable near-linear relation between their globular cluster (GC) system mass and their host galaxy halo mass. Extending this relation to the mass range of dwarf galaxies has been problematic due to the difficulty in measuring independent halo masses. Here we derive new halo masses based on stellar and HI gas kinematics for a sample of nearby dwarf galaxies with GC systems. We find that the GC system mass--halo mass relation for galaxies populated by GCs holds from halo masses of M200∼1014M⊙M_{200} \sim 10^{14} M_{\odot} down to below M200M_{200} ∼109M⊙\sim 10^9 M_{\odot}, although there is a substantial increase in scatter towards low masses. In particular, three well-studied ultra diffuse galaxies, with dwarf-like stellar masses, reveal a wide range in their GC-to-halo mass ratios. We compare our GC system--halo mass relation to the recent model of El Badry et al., finding that their fiducial model does not reproduce our data in the low mass regime. This may suggest that GC formation needs to be more efficient than assumed in their model, or it may be due to the onset of stochastic GC occupation in low mass halos. Finally, we briefly discuss the stellar mass-halo mass relation for our low mass galaxies with GCs, and we suggest some nearby dwarf galaxies for which searches for GCs may be fruitful.Comment: 16 pages, 5 figures, accepted for publication in MNRA

    Out of Options: Why So Many Workers in Small Businesses Lack Affordable Health Insurance, and How Health Care Reform Can Help

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    Based on the 2007 Commonwealth Fund Biennial Health Insurance Survey, examines small business employees' limited access to health insurance and contributing factors. Explores how small businesses and employees could benefit from proposed reforms

    Losing Ground: How the Loss of Adequate Health Insurance Is Burdening Working Families: Findings From the Commonwealth Fund Biennial Health Insurance Surveys, 2001-2007

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    Highlights declining health coverage and rising deductibles for American adults and the implications for medical costs, debt burdens, and access to health care. Examines socioeconomic and demographic characteristics of the uninsured and underinsured

    Gaps in Health Insurance: An All-American Problem

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    Presents findings from a survey that examines health insurance coverage, rising healthcare costs, and the health and financial consequences to families that experience breaks in insurance

    Rite of Passage? Why Young Adults Become Uninsured and How New Policies Can Help

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    Assesses the scope of the health insurance problem facing young adults, its causes and implications, and offers policy changes that could help them stay insured as they make the transition to independent living

    Health Coverage for Aging Baby Boomers: Findings From The Commonwealth Fund Survey of Older Adults

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    Examines healthcare quality and access by baby boomers in working families. Offers recommendations for expanding coverage, including options for savings accounts and early participation in Medicare

    Observational constraints on stellar feedback in dwarf galaxies

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    Feedback to the interstellar medium (ISM) from ionising radiation, stellar winds and supernovae is central to regulating star formation in galaxies. Due to their low mass (M∗<109M_{*} < 10^{9}\,M⊙_\odot), dwarf galaxies are particularly susceptible to such processes, making them ideal sites to study the detailed physics of feedback. In this perspective, we summarise the latest observational evidences for feedback from star forming regions and how this drives the formation of 'superbubbles' and galaxy-wide winds. We discuss the important role of external ionising radiation -- 'reionisation' -- for the smallest galaxies. And, we discuss the observational evidences that this feedback directly impacts galaxy properties such as their star formation histories, metal content, colours, sizes, morphologies and even their inner dark matter densities. We conclude with a look to the future, summarising the key questions that remain unanswered and listing some of the outstanding challenges for galaxy formation theories.Comment: Invited Perspective article, accepted for publication in Nature Astronom
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