11,827 research outputs found
Determination of Optimum Frame Rates for Observation of Construction Operations from Time-Lapse Movies
Construction professionals have been using time-lapse movies in monitoring construction operations. However, some amount of detail is always lost in the interval between two consecutive frames in a time-lapse movie. This poses the question: By how much can the frame rate be lowered from the standard 30fps (frames per second) to allow for the accurate observation of construction operations from a time-lapse movie? This paper addresses the problem by establishing the optimum frame rates for observation of activities related to mortar mixing and block handling. The activities were first recorded at the standard rate of 30fps. Using the Adobe Premier Pro video editing software, the records were then segregated into still images from which 15 different time-lapse movies of various time intervals were generated. The movies were then shown to 25 Construction Managers. A structured questionnaire was employed to capture the level of accuracy with which Construction Managers could interpret the job site situation from each movie. The results suggest that 1fpm (frame per minute) is sufficient for the accurate tracking of labourers involved in mortar mixing while 1 frame in every 20 seconds is sufficient for accurate identification of number of cement bags used. However, for tracking number of blocks off-loaded, and those damaged, 1 frame in every 2 seconds is required
On the EDM Cancellations in D-brane models
We analyze the possibility of simultaneous electron, neutron, and mercury
electric dipole moment (EDM) cancellations in the mSUGRA and D--brane models.
We find that the mercury EDM constraint practically rules out the cancellation
scenario in D-brane models whereas in the context of mSUGRA it is still allowed
with some fine-tuning.Comment: 10 pages, to appear in Phys. Rev. Let
One-loop Neutron Electric Dipole Moment from Supersymmetry without R-parity
We present a detailed analysis together with exact numerical calculations on
one-loop contributions to neutron electric dipole moment from supersymmetry
without R-parity, focusing on the gluino, chargino, and neutralino
contributions. Apart from the neglected family mixing among quarks, complete
formulae are given for the various contributions, through the quark dipole
operators, to which the present study is restricted. We discuss the structure
and main features of the R-parity violating contributions and the interplay
between the R-parity conserving and violating parameters. In particular, the
parameter combination , under the optimal
parametrization adopted, is shown to be solely responsible for the R-parity
violating contributions in the supersymmetric loop diagrams. While
could bear a complex phase, the latter is not
necessary to have a R-parity violating contribution.Comment: 43 pages Revtex with 15 eps- and 4 ps- figure files incoporated;
proofread version to be published in Phys. Rev.
CP violating asymmetries in single top quark production at the Tevatron p pbar collider
Analytic expressions for the angular distributions of the -quarks
associated with single -quark production in and of the leptons from the subsequent decay are
obtained in the laboratory system. CP violation in the -production vertex is
assumed. Different angular and total cross section CP violating asymmetries are
considered. Relations testing CP violation solely in the -decay vertex are
also obtained. A numerical analysis is performed in the MSSM with a CP
violating phase of the trilinear coupling . The asymmetries are
typically of the order - .Comment: The numerical results are corrected and some changes that meet the
requirements of Phys. Rev. D are mad
Relaxation of the Dynamical Gluino Phase and Unambiguous Electric Dipole Moments
We propose a new axionic solution of the strong CP problem with a
Peccei-Quinn mechanism using the gluino rather than quarks. The spontaneous
breaking of this new global U(1) at 10^{11} GeV also generates the
supersymmetry breaking scale of 1 TeV (solving the so-called \mu problem at the
same time) and results in the MSSM (Minimal Supersymmetric Standard Model) with
R parity conservation. In this framework, electric dipole moments become
calculable without ambiguity.Comment: Typos corrected and a footnote added, 10 p
Efficient Protocol of Micropropagation, and Organogenesis of Euphorbia pulcherrima Willd. Plants via Stem and Leaf Segments
A highly efficient plant propagation protocol was developed for Euphorbia pulcherrima Willd. using nodal shoot segments. Different concentrations of 6-Benzylaminopurine (BAP) singly or in combination with both GA3 and adenine sulfate. Use of BAP at 0.5 mg/l combination with 20 mg/l adenine sulfate induced the highest frequency (100%) of shoot induction as well as maximum number of shoots per explant (10.6) followed by using the combination of 1.5 mg/l BAP with 0.5 mg/l GA3 which create 6.76 shoot /explants, while lower number of shoot/explants (5.88) was recorded in MS medium supplemented with 0.5 mg/l BAP and the proliferated shoot clumps were further multiplied and elongated. The highest rooting frequency (77.8%) as well as highest number of roots (4.9) was observed in full strength MS medium supplemented with 1.0 mg/l Indole-acetic acid (IAA). In order to study the effects of organs culture (stem and leaf) in vitro culture of poinsettia, shoot regeneration frequently was 100% when the stem explants were placed on MS medium containing 1.0 mg/l BAP combination with 0.2 mg/l of NAA. Highest number of shoots per explant (6.95) was recorded followed by (5.83) shoots per explants in MS medium containing BAP 0.5 mg/l combination with GA3 0.1 mg/l. Shoot regeneration from Leaf explants reached 77.73% when the leaf explants were placed on MS medium containing BAP 1.0 mg/l combination with 0.2 mg/l of IAA and highest number of shoots per explant (3.00) was recorded. Regenerated plantlets were acclimatized successfully in the green house and finally transplanted in the pots
Probing scalar-pseudoscalar mixing in the CP violating MSSM at high-energy colliders
We study the production processes , and
in the context of the CP violating MSSM. In a given
channel we show that the cross-section for all i (=1,2,3) can be above 0.1 fb
provided M_{H_{2,3}}\la 300 GeV. This should be detectable at a Next Linear
Collider and would provide evidence for scalar-pseudoscalar mixing.Comment: 17 pages, RevTex, 4 ps figures, figure 4 changed, minor modifications
to text, version to appear in PR
The Electric Dipole Moment and CP Violation in in SUGRA Models with Nonuniversal Gaugino Masses
The constraints of electric dipole moments (EDMs) of electron and neutron on
the parameter space in supergravity (SUGRA) models with nonuniversal gaugino
masses are analyzed. It is shown that with a light sparticle spectrum, the
sufficient cancellations in the calculation of EDMs can happen for all phases
being order of one in the small tan case and all phases but
() order of one in the large tan case. This is
in contrast to the case of mSUGRA in which in the parameter space where
cancellations among various SUSY contributions to EDMs happen
must be less than for small and for
large . Direct CP asymmetries and the T-odd polarization of lepton in
are investigated in the models. In the large tan case,
and for l= () can be enhanced by about a factor of
ten (ten) and ten (three) respectively compared to those of mSUGRA.Comment: 12 pages, latex, 4 figures, a few change
A Resolution to the Supersymmetric CP Problem with Large Soft Phases via D-branes
We examine the soft supersymmetry breaking parameters that result from
various ways of embedding the Standard Model (SM) on D-branes within the Type I
string picture, allowing the gaugino masses and to have large CP-
violating phases. One embedding naturally provides the relations among soft
parameters to satisfy the electron and neutron electric dipole moment
constraints even with large phases, while with other embeddings large phases
are not allowed. The string models provide some motivation for large phases in
the soft breaking parameters. The results generally suggest how low energy data
might teach us about Planck scale physics.Comment: 11 pages, 2 eps figures; revised references and updated tex
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