Effect of sea quarks on the single-spin asymmetries ALW±A^{W^{\pm}}_{L} in polarized pp collisions at RHIC

We calculate the single-spin asymmetries $A^{W^{\pm}}_{L}$ of $W^{\pm}$ bosons produced in polarized pp collisions with the valence part of the up and down quark helicity distributions modeled by the light-cone quark-spectator-diquark model while the sea part helicity distributions of the up and down quarks treated as parametrization. Comparing our results with those from experimental data at RHIC, we find that the helicity distributions of sea quarks play an important role in the determination of the shapes of $A^{W^{\pm}}_{L}$. It is shown that $A^{W^{-}}_{L}$ is sensitive to $\Delta \bar u$, while $A^{W^{+}}_{L}$ to $\Delta \bar d$ intuitively. The experimental data of the polarized structure functions and the sum of helicities are also important to constrain the sizes of quark helicity distributions both for the sea part and the valence part of the nucleon.Comment: 19 latex pages, 5 figures, final version for publicatio

Asymptotic properties of mean survival estimate based on the Kaplan–Meier curve with an extrapolated tail

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/90597/1/pst514.pd

Detecting Potential Overbilling in Medicare Reimbursement via Hours Worked

Almost 3% of physicians who serve Medicare Part B Fee-for-Service (FFS) patients bill Medicare for services that would take more than 100 hours per week to provide – an implausible number – in this novel and easy-to-implement approach to detect potential overbilling based on the hours implied by actual billing codes

Ethnic Disparities in Mental Health among Asian Americans: Evidence from a National Sample

Asian Americans have become the fastest-growing racial group in the United States, yet their health profiles are still under-explored. In particular, the existing research on Asian American mental health has not devoted adequate attention to the enormous ethnic heterogeneity of the group. Grounded upon theoretical frameworks of the tri-racial system and a contextual approach, we examined ethnic disparities in Asian American mental health using data from the National Latino and Asian American Study (NLAAS). We focused on ethnic membership, immigration-related factors, socioeconomic status, and social support as the main correlates of multiple outcomes, including self-rated mental health, psychological distress, and various types of psychiatric disorders. Our project revealed considerable ethnic variations, with Asian Indian Americans displaying the most significant mental health advantage in general, Korean Americans being most prone to psychological disorders, and other ethnic groups falling somewhere in between. Although Vietnamese Americans and Chinese Americans had worse self-rated health than Asian Indian Americans, such differences disappeared once we controlled for immigration and socioeconomic status, suggesting candidate mechanisms that might explain some of the ethnic disparities. This study sheds light on the importance of analyzing ethnic heterogeneity and incorporating multiple outcomes when exploring Asian American mental health. It also calls for more data collection efforts on national samples of diverse subgroups to contribute to health disparities research and practice

The Management Thinking Under the Phenomenon of Plagiarism in Chinese Net Literature

The Thirteenth Five-Year Plan period is an important period for China to become a powerful intellectual property country from a big intellectual property country. As an important part of intellectual property strategy, cultural innovation has attracted wide attention. For the most popular literary form at present, net literature drives the export of Chinese traditional culture and innovative culture. The case of "The Princess Wei yang" has aroused widespread concern in academic circles. How to define plagiarism and how to protect the rights of the authors has become a hot topic at present. This paper starts with the plagiaristic problem behind the adaptation of net literature, analyzes the negative impact of plagiarism on the creative willingness of the people and the national cultural innovation through questionnaires, and provides some effective suggestions for the problems of plagiarism which are difficult to define and safeguard legal rights. Keywords: net literature， plagiarism，adaptation，intellectual property rights，managemen