1,521 research outputs found
Ready-to-use post-Newtonian gravitational waveforms for binary black holes with non-precessing spins: An update
For black-hole binaries whose spins are (anti-) aligned with respect to the
orbital angular momentum of the binary, we compute the frequency domain phasing
coefficients including the quadratic-in-spin terms up to the third
post-Newtonian (3PN) order, the cubic-in-spin terms at the leading order,
3.5PN, and the spin-orbit effects up to the 4PN order. In addition, we obtain
the 2PN spin contributions to the amplitude of the frequency-domain
gravitational waveforms for non-precessing binaries, using recently derived
expressions for the time-domain polarization amplitudes of binaries with
generic spins, complete at that accuracy level. These two results are updates
to Arun et al. (2009) [1] for amplitude and Wade et al. (2013) [2] for phasing.
They should be useful to construct banks of templates that model accurately
non-precessing inspiraling binaries, for parameter estimation studies, and or
constructing analytical template families that accounts for the
inspiral-merger-ringdown phases of the binary.Comment: 8 pages, an additional file (readable in MATHEMATICA) containing all
the key results included in the sourc
Identifying Compliance Issues in the Community Health Care Clinic Environment
This study explored the high number of failed appointments and follow-up appointments at a community health care childrenâs clinic. A thirty-seven item questionnaire was randomly given to 112 participants seeking health care at the clinic on a random basis. Based on literature reviews, five hypothesis were generated to examine reasons for failing to keep appointments for children: 1. Communication difficulties between healthcare personnel and parents regarding patient comprehension of instructions and bottle directions were anticipated. 2. Patient/physician/clinic relationships were expected to influence patient compliance. The need for more reminder calls for appointments was anticipated to be a factor in patient compliance also. 3. Influence from other family members or subjective norms was anticipated to influence patient follow-up and medication compliance. 4. Socioeconomic conditions were anticipated to have a bearing on whether some parents were able to complete medical treatment plans. 5. The healthcare beliefs and lack of awareness of preven tative medicine was believed to be a barrier to follow-up appointments and well-child appointments. Findings indicated that patients did have difficulties with instructions and bottle directions. Patients also expressed a need for reminder calls, admitted to being influenced by other family members, and indicated that their financial resources for medical care were limited. Nearly one-half of the respondents stated that they did not know what the term âpreventative medicineâ meant. These findings indicate that new tools for communicating medical treatment and increasing healthcare awareness are needed
Higher-order spin effects in the amplitude and phase of gravitational waveforms emitted by inspiraling compact binaries: Ready-to-use gravitational waveforms
We provide ready-to-use time-domain gravitational waveforms for spinning
compact binaries with precession effects through 1.5PN order in amplitude and
compute their mode decomposition using spin-weighted -2 spherical harmonics. In
the presence of precession, the gravitational-wave modes (l,m) contain
harmonics originating from combinations of the orbital frequency and precession
frequencies. We find that the gravitational radiation from binary systems with
large mass asymmetry and large inclination angle can be distributed among
several modes. For example, during the last stages of inspiral, for some
maximally spinning configurations, the amplitude of the (2,0) and (2,1) modes
can be comparable to the amplitude of the (2,2) mode. If the mass ratio is not
too extreme, the l=3 and l=4 modes are generally one or two orders of magnitude
smaller than the l = 2 modes. Restricting ourselves to spinning, non-precessing
compact binaries, we apply the stationary-phase approximation and derive the
frequency-domain gravitational waveforms including spin-orbit and spin(1)-
spin(2) effects through 1.5PN and 2PN order respectively in amplitude, and
2.5PN order in phase. Since spin effects in the amplitude through 2PN order
affect only the first and second harmonics of the orbital phase, they do not
extend the mass reach of gravitational-wave detectors. However, they can
interfere with other harmonics and lower or raise the signal-to-noise ratio
depending on the spin orientation. These ready-to-use waveforms could be
employed in the data-analysis of the spinning, inspiraling binaries as well as
in comparison studies at the interface between analytical and numerical
relativity.Comment: 43 pages, 10 Postscript figures. submitted to Physical Review D.
Includes corrections due to errat
Novelty Induces Behavioural And Glucocorticoid Responses In A Songbird Artificially Selected For Divergent Personalities
Stress physiology is thought to contribute to individual differences in behaviour. In part this reflects the fact that canonical personality measures consist of responses to challenges, including novel objects and environments. Exposure to novelty is typically assumed to induce a moderate increase in glucocorticoids (CORT), although this has rarely been tested. We tested this assumption using great tits, Parus major, selected for divergent personalities (bold-fast and shy-slow explorers), predicting that the shy birds would exhibit higher CORT following exposure to a novel object. We also scored behavioural responses to the novel object, predicting that bold birds would more frequently approach the novel object and exhibit more abnormal repetitive behaviours. We found that the presence of a novel object did induce a moderate CORT response, but selection lines did not differ in the magnitude of this response. Furthermore, although both selection lines showed a robust CORT elevation to a subsequent restraint stressor, the CORT response was stronger in bold birds and this effect was specific to novel object exposure. Shy birds showed a strong positive phenotypic correlation between CORT concentrations following the novel object exposure and the subsequent restraint stress. Behaviourally, the selection lines differed in their response during novel object exposure: as predicted, bold birds more frequently approached the novel object and shy birds more strongly decreased overall locomotion during the novel object trial, but birds from both selection lines showed significant and similar frequencies of abnormal repetitive behaviours during novel object exposure. Our findings support the hypothesis that personality emerges as a result of correlated selection on behaviour and underlying endocrine mechanisms and suggest that the relationship between endocrine stress physiology and personality is context dependent
Determinants Of Innovative Capability Of A Country And Its Role In Economic Growth
This paper discusses the role that innovation plays in global competition and provides examples showing how firms from selected emerging markets use innovation to compete with global firms from the developed world. This paper also discusses the role of innovative capability in growth of a country by suggesting that in the long-term, a nationâs higher order competitive advantage can only be built with the innovative capability of its firms. In this context, an empirical model was used to identify the determinants of innovative capability of a country. The discussion of these determinants should be useful to policymakers in countries attempting to promote economic growth by improving the productivity of firms in their respective countries
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