650 research outputs found
The Impact of Social Media on Adolescent Mental Health
The number of adolescents reporting mental health issues such as anxiety and depression has dramatically increased in the last two decades. As this trend coincides with the increase in social media use by adolescents, many researchers have studied the correlation between the two. This literature review examines the correlation along with the pros and cons of adolescent social media use outside and inside the classroom. Most recently, research is showing how social media is used impacts the state of an adolescentâs mental health rather than the use of social media in general. Teachers and schools can help students learn how to use social media to foster positive relationships, communicate constructively with a diverse array of individuals, and promote passions and interests by integrating social media into the curriculum
U.S.-Mongolian Relations: Two Years of Progress
No abstract available DOI: http://dx.doi.org/10.5564/mjia.v0i7.134 The Mongolian Journal of International Affairs; Number 7, 2000, Pages 3-
Systematic Theoretical Search for Dibaryons in a Relativistic Model
A relativistic quark potential model is used to do a systematic search for
quasi-stable dibaryon states in the , , and three flavor world.
Flavor symmetry breaking and channel coupling effects are included and an
adiabatic method and fractional parentage expansion technique are used in the
calculations. The relativistic model predicts dibaryon candidates completely
consistent with the nonrelativistic model.Comment: 12 pages, latex, no figure
Astrophysical thermonuclear functions
As theoretical knowledge and experimental verification of nuclear cross
sections increases it becomes possible to refine analytic representations for
nuclear reaction rates. In this paper mathematical/statistical techniques for
deriving closed-form representations of thermonuclear functions are summarized
and numerical results for them are given.The purpose of the paper is also to
compare numerical results for approximate and closed-form representations of
thermonuclear functions.Comment: 17 pages in LaTeX, 8 figures available on request from
[email protected]
An Extension of the Fractional Parentage Expansion to Nonrelativistic and Relativistic Dibaryon Calculations
The fractional parentage expansion method is extended from
nonrelativistic to and relativistic dibaryon calculations. A
transformation table between physical bases and symmetry bases for the
dibaryon is provided. A program package has been written for
dibaryon calculation based on the fractional parentage expansion method.Comment: 15 pages text plus 18 pages tables, latex, no figure
RPA-Approach to the Excitations of the Nucleon, Part II: Phenomenology
The tensor-RPA approach developed previously in part I is applied to the
Nambu-Jona-Lasinio (NJL) model. As a first step we investigate the structure of
Dirac-Hartree-Fock solutions for a rotationally and isospin invariant
ground-state density. Whereas vacuum properties can be reproduced, no solitonic
configuration for a system with unit baryon number is found. We then solve the
tensor-RPA equation employing simple models of the nucleon ground state. In
general the ph interaction effects a decrease of the excited states to lower
energies. Due to an enhanced level density at low energies the obtained spectra
cannot be matched with the experimental data when a standard MIT-bag
configuration is used. However, when the size of the nucleon quark core is
reduced to approximately 0.3 fm a fair description of the baryon spectrum in
the positive-parity channel is achieved. For this purpose the residual
interaction turns out to be crucial and leads to a significant improvement
compared with the mean-field spectra.Comment: 33 pages, Latex, 9 Postscpript figures, section on the excited states
has been completely rewritten after error was detected, results are now much
more encouragin
Effects of the levonorgestrel-releasing intrauterine device on the immune microenvironment of the human cervix and endometrium
There is little information regarding the impact of the intrauterine device on immune parameters of the upper female reproductive tract related to risk of HIV acquisition
Spectroscopy of Heavy Mesons Expanded in 1/m_Q
Operating just once with the naive Foldy-Wouthuysen-Tani transformation on
the relativistic Fermi-Yang equation for bound states described by
the semi-relativistic Hamiltonian which includes Coulomb-like as well as
confining scalar potentials, we have calculated heavy meson mass spectra of D
and B together with higher spin states. Based on the formulation recently
proposed, their masses and wave functions are expanded up to the second order
in with a heavy quark mass and the lowest order equation is
examined carefully to obtain a complete set of eigenfunctions for the
Schr\"odinger equation. Heavy quark effective theory parameters, ,
, and , are also determined at the first and second order
in .Comment: 49 pages, 5 epsf figure
Logarithmic perturbation theory for radial Klein-Gordon equation with screened Coulomb potentials via expansions
The explicit semiclassical treatment of logarithmic perturbation theory for
the bound-state problem within the framework of the radial Klein-Gordon
equation with attractive real-analytic screened Coulomb potentials, contained
time-component of a Lorentz four-vector and a Lorentz-scalar term, is
developed. Based upon -expansions and suitable quantization conditions a
new procedure for deriving perturbation expansions is offered. Avoiding
disadvantages of the standard approach, new handy recursion formulae with the
same simple form both for ground and excited states have been obtained. As an
example, the perturbation expansions for the energy eigenvalues for the
Hulth\'en potential containing the vector part as well as the scalar component
are considered.Comment: 14 pages, to be submitted to Journal of Physics
The role of ethics and ideology in our contribution to global health The topic of this article has vividly interested the author for many years. It is fascinating to him that the issues at stake have not changed for the last 30 years or so. As proof of this â and on purpose â references quoted are both those published before 1985 and after 1995 (Table 1). Considerable material on this topic was already available from the mid 1970s on. The end result has been the (re)construction of a scenario that has been stubborn to change and that looks into most of the, still highly relevant, burning questions of then and now on the issues pertaining to the title of this contribution for debate. It will be of interest to the reader to see how we often need to be reminded of the things our peers had evidence of and wrote about long before us â as the examples of Dr. Virchov and of the Alma Ata Declaration, for instance, show.
What drives public health professionals in their daily work? Presumably it is the appeal of working, either locally or globally, to alleviate the suffering caused by (preventable) ill-health. This article explores the political awareness of health professionals, the political implications of their daily activities and suggests an enhanced role for them in the battle against preventable ill-health worldwide. The starting point for this article is the motivating principles behind these professionals as individuals. It challenges established paradigms in health, medicine, development and academia with a focus on health professionals' political, ethical and ideological motivations and awareness plus the implications of their actions in the realm of global health in the future. It further has implications for the everyday practice of health care providers, public health practitioners, epidemiologists and social scientists in academia
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