1,857,138 research outputs found
Herding to A Side of Order Book Balance
In the growing econophysics, it is quite rare that the presented analyses approach the interesting properties of order book. However, a lot of data are available in the order book, and analysis on this object will bring us to further understanding of the market. We analyze some order book of stocks traded in Jakarta Stock Exchange and see interesting properties there by looking at the balance of the order book. We also build a model based on the work of Chiarella and Iori [1] with some modi¯cations to explain the herding pattern of traders through the order book
IDEAS project - Data Informed Platform for Health feasibility study in Uttar Pradesh
The IDEAS project sought to improve the health and survival of mothers and babies through generating evidence to inform policy and practice. This data collection contains topic guides and other research tools used to assess the feasibility of introducing a Data Informed Platform for Health (DIPH), in order to bring together key data from the public and private health sector on inputs and processes that may influence maternal and newborn health. The DIPH was intended to promote the use of local data for decision-making and priority setting at local health administration level, and for programme appraisal and comparison at regional and zonal level
The structure of non-spacelike geodesics in dust collapse
We study here the behaviour of non-spacelike geodesics in dust collapse
models in order to understand the casual structure of the spacetime. The
geodesic families coming out, when the singularity is naked, corresponding to
different initial data are worked out and analyzed. We also bring out the
similarity of the limiting behaviour for different types of geodesics in the
limit of approach to the singularity.Comment: 23 pages, 6 figures, to appear in PR
Data calibration for the MASCARA and bRing instruments
Aims: MASCARA and bRing are photometric surveys designed to detect
variability caused by exoplanets in stars with . Such variability
signals are typically small and require an accurate calibration algorithm,
tailored to the survey, in order to be detected. This paper presents the
methods developed to calibrate the raw photometry of the MASCARA and bRing
stations and characterizes the performance of the methods and instruments.
Methods: For the primary calibration a modified version of the coarse
decorrelation algorithm is used, which corrects for the extinction due to the
earth's atmosphere, the camera transmission, and intrapixel variations.
Residual trends are removed from the light curves of individual stars using
empirical secondary calibration methods. In order to optimize these methods, as
well as characterize the performance of the instruments, transit signals were
injected in the data. Results: After optimal calibration an RMS scatter of 10
mmag at is achieved in the light curves. By injecting transit
signals with periods between one and five days in the MASCARA data obtained by
the La Palma station over the course of one year, we demonstrate that MASCARA
La Palma is able to recover 84.0, 60.5 and 20.7% of signals with depths of 2, 1
and 0.5% respectively, with a strong dependency on the observed declination,
recovering 65.4% of all transit signals at versus 35.8% at
. Using the full three years of data obtained by MASCARA La
Palma to date, similar recovery rates are extended to periods up to ten days.
We derive a preliminary occurrence rate for hot Jupiters around A-stars of , knowing that many hot Jupiters are still overlooked. In the era of
TESS, MASCARA and bRing will provide an interesting synergy for finding
long-period ( days) transiting gas-giant planets around the brightest
stars.Comment: 18 pages, 17 figures, accepted for publication in A&
Second-Order Eikonal Corrections for A(e,e'p)
The first-order eikonal approximation is frequently adopted in interpreting
the results of measurements. Glauber calculations, for example,
typically adopt the first-order eikonal approximation. We present an extension
of the relativistic eikonal approach to which accounts for
second-order eikonal corrections. The numerical calculations are performed
within the relativistic optical model eikonal approximation. The nuclear
transparency results indicate that the effect of the second-order eikonal
corrections is rather modest, even at (GeV/c). The same
applies to polarization observables, left-right asymmetries, and differential
cross sections at low missing momenta. At high missing momenta, however, the
second-order eikonal corrections are significant and bring the calculations in
closer agreement with the data and/or the exact results from models adopting
partial-wave expansions.Comment: 16 pages, 4 figures, 1 table, submitted to Phys. Lett.
The nn quasi-free nd breakup cross section: discrepancies to theory and implications on the 1S0 nn force
Large discrepancies between quasi-free neutron-neutron (nn) cross section
data from neutron-deuteron (nd) breakup and theoretical predictions based on
standard nucleon-nucleon (NN) and three-nucleon (3N) forces are pointed out.
The nn 1S0 interaction is shown to be dominant in that configuration and has to
be increase to bring theory and data into agreement. Using the next-to-leading
order (NLO) 1S0 interaction of chiral perturbation theory (chiPT) we
demonstrate that the nn QFS cross section only slightly depends on changes of
the nn scattering length but is very sensitive to variations of the effective
range parameter. In order to account for the reported discrepancies one must
decrease the nn effective range parameter by about 12 % from its value implied
by 19charge symmetry and charge independence of nuclear forces.Comment: 19 pages, 11 figure
Emerging Risks in the Dutch Food Chain report on project 2: Application of indicator analyses on several critical points in the salmon production chain and identification of related data sources
An indicator analysis was performed on the fish production chain by assessing the indicators which may be of importance for the detection of emerging risks. The indicators were embedded in a “risk pathway”, in which the relations between different indicators could be illustrated. The risk pathways illustrate the main characteristics of the salmon production chain. However further research is required in order to develop further interaction with other sectors, and production chains to bring emerging risk detection to the next level. In relation to the assigned indicators, a selection of (electronic) data sources were identified in order to be able to combine data flows with indicators and risk pathways. The indicators were analyzed for availability, sources of data entry, validation of data sources, update frequency and delay in input. The combination of risk pathways, indicators and data sources, will be one of the key information sources for the further development of an Emerging Risk Detection Support System (ERDSS)
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