7,290 research outputs found
NLO QCD corrections to Single Top and W associated production at the LHC with forward detector acceptances
In this paper we study the Single Top and W boson associated photoproduction
via the main reaction at
the 14 TeV Large Hadron Collider (LHC) up to next-to-leading order (NLO) QCD
level assuming a typical LHC multipurpose forward detector. We use the
Five-Flavor-Number Schemes (5FNS) with massless bottom quark assumption in the
whole calculation. Our results show that the QCD NLO corrections can reduce the
scale uncertainty. The typical K-factors are in the range of 1.15 to 1.2 which
lead to the QCD NLO corrections of 15 to 20 correspond to the
leading-order (LO) predictions with our chosen parameters.Comment: 41pages, 12figures. arXiv admin note: text overlap with
arXiv:1106.2890 by other author
Automatic Emergency Dust-Free solution on-board International Space Station with Bi-GRU (AED-ISS)
With a rising attention for the issue of PM2.5 or PM0.3, particulate matters
have become not only a potential threat to both the environment and human, but
also a harming existence to instruments onboard International Space Station
(ISS). Our team is aiming to relate various concentration of particulate
matters to magnetic fields, humidity, acceleration, temperature, pressure and
CO2 concentration. Our goal is to establish an early warning system (EWS),
which is able to forecast the levels of particulate matters and provides ample
reaction time for astronauts to protect their instruments in some experiments
or increase the accuracy of the measurements; In addition, the constructed
model can be further developed into a prototype of a remote-sensing smoke alarm
for applications related to fires. In this article, we will implement the
Bi-GRU (Bidirectional Gated Recurrent Unit) algorithms that collect data for
past 90 minutes and predict the levels of particulates which over 2.5
micrometer per 0.1 liter for the next 1 minute, which is classified as an early
warningComment: 11 pages, 5 figures, and 1 tabl
General formula for the four-quark condensate and vacuum factorization assumption
By differentiating the dressed quark propagator with respect to a variable
background field, the linear response of the dressed quark propagator in the
presence of the background field can be obtained. From this general method,
using the vector background field as an illustration, we derive a general
formula for the four-quark condensate . This formula contains the
corresponding fully dressed vector vertex and it is shown that factorization
for holds only when the dressed vertex is taken to be the bare one.
This property also holds for all other type of four-quark condensate.Comment: Revtex4, 11 pages, no figure
New Method for Numerically Solving the Chemical Potential Dependence of the Dressed Quark Propagator
Based on the rainbow approximation of Dyson-Schwinger equation and the
assumption that the inverse dressed quark propagator at finite chemical
potential is analytic in the neighborhood of , a new method for
obtaining the dressed quark propagator at finite chemical potential from
the one at zero chemical potential is developed. Using this method the dressed
quark propagator at finite chemical potential can be obtained directly from the
one at zero chemical potential without the necessity of numerically solving the
corresponding coupled integral equations by iteration methods. A comparison
with previous results is given.Comment: Revtex, 14 pages, 5 figure
High photo-excited carrier multiplication by charged InAs dots in AlAs/GaAs/AlAs resonant tunneling diode
We present an approach for the highly sensitive photon detection based on the
quantum dots (QDs) operating at temperature of 77K. The detection structure is
based on an AlAs/GaAs/AlAs double barrier resonant tunneling diode combined
with a layer of self-assembled InAs QDs (QD-RTD). A photon rate of 115 photons
per second had induced 10nA photocurrent in this structure, corresponding to
the photo-excited carrier multiplication factor of 10^7. This high
multiplication factor is achieved by the quantum dot induced memory effect and
the resonant tunneling tuning effect of QD-RTD structure.Comment: 10 pages,5 figures. Submitted to Applied Physics Letter
VIE-FG-FFT for Analyzing EM Scattering from Inhomogeneous Nonmagnetic Dielectric Objects
A new realization of the volume integral equation (VIE) in combination with the fast Fourier transform (FFT) is established by fitting Green’s function (FG) onto the nodes of a uniform Cartesian grid for analyzing EM scattering from inhomogeneous nonmagnetic dielectric objects. The accuracy of the proposed method is the same as that of the P-FFT and higher than that of the AIM and the IE-FFT especially when increasing the grid spacing size. Besides, the preprocessing time of the proposed method is obviously less than that of the P-FFT for inhomogeneous nonmagnetic dielectric objects. Numerical examples are provided to demonstrate the accuracy and efficiency of the proposed method
Life Assessment of Railway Tunnel Lining Structure Based on Reliability Theory
The reliability of the tunnel lining during its service life has significance for tunnel safety management. To capture the performance of the lining under the effect of deterioration factors, the time-varying reliability theory was applied to predict the service life of the lining. The failure process of the lining structure under an erosion environment was analyzed. The limit state equations of the lining structure were established based on the durability criterion and the bearing capacity criterion, respectively. The time-varying reliability of the tunnel was calculated using the Monte-Carlo method with an engineering example, and the service life of the tunnel under different criteria was predicted based on the target reliability. The results show that the predicted service life of the tunnel is 77.5 years under the durability criterion and 95 years under the bearing capacity criterion, assuming that the tunnel structure is in an erosive environment at the beginning of construction and that no protective measures are taken under the most unfavourable conditions. The durability meets the structural applicability, and the bearing capacity meets the structural safety, which is in line with the actual needs of the project. The study results can provide a basis and reference for the future durability design, life prediction, and maintenance management of similar service tunnels
Crystal structure of 1, 7, 8, 9-tetrachloro-4-(2-fluorobenzyl)-10, 10-dimethoxy-4-azatricyclo[5.2.1.02, 6]dec-8-ene-3, 5-dione
Acknowledgements We gratefully acknowledge financial support from the National Natural Science Foundation of China (No.81072530).Peer reviewedPublisher PD
Teaching Languages Online: Innovations and Challenges
Language professionals long resisted teaching online mainly because it was unthinkable to teach speaking in the online environment. Recent advances in technology, however, have made it conceivable. This chapter presents the design and implementation of online courses in Japanese and Chinese recently developed and being offered at Purdue University. We will highlight not only technologies involved, but also pedagogical innovations that helped resolve difficult issues. The efficacy of online teaching will also be touched upon. Reactions from enrolled students and the instructors that have taught the courses will also be shared
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