264 research outputs found
[ç 究è«æ] Historical Background to one of the Most Cited and Influential Papers in Physics: Ugo Fano on Configuration Interaction, 1961
In the December 15, 1961 issue of Physical Review Ugo Fano, then at the National Bureau of Standards in Washington, D.C., published a paper entitled, âEffects of configuration interaction on intensities and phase shifts." (Fano, 1961) That paper has become one of the most cited papers in American physics. The impetus for the paper was an experimental result, in 1954, by Silverman on an unusual behavior of the continuum of helium in the neighborhood of a discrete peak, under electron impact, reported in a Scientific Report by Silverman and Lassettre in 1957 under an Air Force grant, reported at a conference in 1958, and finally published in the open literature in 1964. The 1957 Report had been brought to Fano's attention by Robert Platzman, a friend and colleague (Fano, 1977, and Fano, personal communication). Fano recognized the shape of the electron impact spectrum as similar to the qualitative characteristics of optical spectra of some of the rare gases (but not including helium) reported in 1935 by Beutler. Fano, in his first post-doctoral paper, published in Il Nuovo Cimento (1935) had outlined a theory to describe these characteristics. Until the measurement of Silverman there had been no measurement, either optical or by electron impact, sufficiently well resolved or defined to serve as a quantitative test of theory. Fano updated his 1935 paper in a paper in 1961, using the Silverman and Lassettre experimental results as a test of his theory. Fano's 1961 paper has become one of the most cited papers in American physics
A simple model for quasar density evolution
It is widely agreed upon that AGN and Quasars are driven by gas accretion
onto a supermassive black hole. The origin of the latter however still remains
an open question. In this work we present the results of an extremely simple
cosmological model combined with an evolutionary scenario in which both the
formation of the black hole as well as the gas accretion onto it are triggered
by major mergers of gas-rich galaxies. Despite its very generous approximations
our model reproduces the quasar density evolution in remarkable agreement with
observations.Comment: 3 pages, 2 figures, to appear in the proceedings of "Relativistic
Astrophysics and Cosmology - Einstein's Legacy" (Eds.: B. Aschenbach, V.
Burwitz, G. Hasinger, and B. Leibundgut), 7 - 11 November 2005, Munich,
Bavaria, German
Phytohemagglutinin-Induced Mitotic Index in Blood Lymphocytes: A Potential Biomarker for Breast Cancer Risk
Background Cell proliferation is associated with the pathogenesis of cancer because it provides opportunities for accumulating genetic mutations. However, biomarkers of cell proliferation in response to environmental stimuli have not been adequately explored for breast cancer risk. Methods In a case-control study of 200 breast cancer patients and 360 healthy controls, we investigated the association between phytohemagglutinin (PHA)-induced mitotic index in blood lymphocyte and breast cancer risk. Results Having high mitotic index (>3.19%) was associated with an increased risk of breast cancer, with adjusted odds ratios (95% confidence interval) of 1.54 (1.03â2.30) and 2.03 (1.18â3.57) for all women and post-menopausal women, respectively. Mitotic index was correlated with some reproductive factors and body mass index in controls. Conclusions Our data suggest increased PHA-induced mitotic index in blood lymphocytes is associated with an increased breast cancer risk and that this association may be modulated by reproductive and other hormones
The power of suggestion: examining the impact of presence or absence of shared first language in the antenatal clinic
© 2019 Foundation for the Sociology of Health & Illness Healthcare encounters involving participants from diverse linguistic backgrounds are becoming more common due to the globalisation of health care and increasing migration levels. Research suggests that this diversity has a significant impact on health outcomes; however less is known about how it is managed in the actual consultation process. This article presents an analysis of antenatal screening consultations video recorded in Hong Kong, using conversation analysis. We consider how the use of a second or subsequent language impacts on these consultations, and on discussions and decisions about further action. The presence or absence of shared first language did not appear to affect the extent to which particular courses of action were promoted or recommended. Recommendations were a common occurrence across consultations with and without shared first language. However, we argue that the routine use of recommendations can be consequential, as second language speakers may have more limited resources to interrogate or contest these. This finding has implications for the ability for professionals to maximise patient involvement in decision-making
Certain subclasses of multivalent functions defined by new multiplier transformations
In the present paper the new multiplier transformations
\mathrm{{\mathcal{J}% }}_{p}^{\delta }(\lambda ,\mu ,l) (\delta ,l\geq
0,\;\lambda \geq \mu \geq 0;\;p\in \mathrm{% }%\mathbb{N} )} of multivalent
functions is defined. Making use of the operator two new subclasses and \textbf{\ }of multivalent analytic
functions are introduced and investigated in the open unit disk. Some
interesting relations and characteristics such as inclusion relationships,
neighborhoods, partial sums, some applications of fractional calculus and
quasi-convolution properties of functions belonging to each of these subclasses
and
are
investigated. Relevant connections of the definitions and results presented in
this paper with those obtained in several earlier works on the subject are also
pointed out
When Will Adolescents Tell Someone About Dating Violence Victimization?
This study examined factors that influence help-seeking among a diverse sample of
adolescents who experienced dating violence. A sample of 57 high school students in
an urban community reported on the prevalence and characteristics of dating violence
in their relationships. Someone observing a dating violence incident and a survivorâs
attaching an emotional meaning to the event significantly influenced adolescents to talk
to someone. When dating violence occurred in isolation, survivors were more likely to
receive no support from others in the aftermath of the incident. Differences between
boysâ and girlsâ help-seeking and implications for dating violence intervention and prevention
programming are discussed.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/90887/1/Black-Tolman-Callahan-Saunders- Weisz- 2008-When will adolescents tell someone about dating violence VAW.pd
You Have to Make Something of All That Rubbish, Do You? An Empirical Investigation of the Social Process of Qualitative Research
The impact of treatment delivery format on response to cognitive behaviour therapy for preadolescent children with anxiety disorders
- âŠ