86,458 research outputs found
Nonballistic heat conduction in an integrable random-exchange Ising chain studied with quantum master equations
No full text10.1103/PhysRevB.77.172411Physical Review B - Condensed Matter and Materials Physics7717-PRBM
Control and Filtering for Discrete Linear Repetitive Processes with H infty and ell 2--ell infty Performance
No full textRepetitive processes are characterized by a series of sweeps, termed passes, through a set of dynamics defined over a finite duration known as the pass length. On each pass an output, termed the pass profile, is produced which acts as a forcing function on, and hence contributes to, the dynamics of the next pass profile. This can lead to oscillations which increase in amplitude in the pass to pass direction and cannot be controlled by standard control laws. Here we give new results on the design of physically based control laws for the sub-class of so-called discrete linear repetitive processes which arise in applications areas such as iterative learning control. The main contribution is to show how control law design can be undertaken within the framework of a general robust filtering problem with guaranteed levels of performance. In particular, we develop algorithms for the design of an H? and dynamic output feedback controller and filter which guarantees that the resulting controlled (filtering error) process, respectively, is stable along the pass and has prescribed disturbance attenuation performance as measured by and – norms
Transmission of Vibrations from High Speed Trains Through Viaducts and Foundations to the Ground
No full textBranching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+
Full text linkAn analysis of B+ → K0
Sπ+ and B+ → K0
S K+ decays is performed with the LHCb experiment. The pp
collision data used correspond to integrated luminosities of 1 fb−1 and 2 fb−1 collected at centre-ofmass
energies of
√
s = 7 TeV and
√
s = 8 TeV, respectively. The ratio of branching fractions and the
direct CP asymmetries are measured to be B(B+ → K0
S K+
)/B(B+ → K0
Sπ+
) = 0.064 ± 0.009 (stat.) ±
0.004 (syst.), ACP(B+ → K0
Sπ+
) = −0.022 ± 0.025 (stat.) ± 0.010 (syst.) and ACP(B+ → K0
S K+
) =
−0.21 ± 0.14 (stat.) ± 0.01 (syst.). The data sample taken at
√
s = 7 TeV is used to search for
B+
c
→ K0
S K+ decays and results in the upper limit ( fc · B(B+
c
→ K0
S K+
))/( fu · B(B+ → K0
Sπ+
)) <
5.8 × 10−2 at 90% confidence level, where fc and fu denote the hadronisation fractions of a ¯b
quark
into a B+
c or a B+ meson, respectively
Extended approach for modelling fixed-flow variable speed pumps
No full textThe original algorithm development of direct calculation pump speed by Todini, Tryby, Wu and Walski (2007) was to maintain a target hydraulic head while this paper extends the algorithm and its implementation for direct calculation of pump speed to deliver the fixed flow via a variable speed pump. The fixed flow pumping is desirable in practical conditions where a fixed amount of flow needs to be supplied to the system to meet demand and/or fill a storage tank. The implementation shows that the extended algorithm is very straightforward based upon the original development. An example system is tested to verify the enhanced development and also to demonstrate the application of modeling the fixed flow variable speed pumps
Cost-Efficient Resource Sharing in Ethernet-based 5G Mobile Fronthaul Networks
No full textIn 5G, Mobile Fronthaul (MF) is referred to as the connection between Remote Radio Head (RRH) and BaseBand processing Unit (BBU) pool. To save cost while satisfying its rising bandwidth demand, we propose a MF Resource-Sharing (MFRS) scheme that allows to share (1) the capacity of the Ethernet network among MF traffic and background traffic and (2) the Baseband Processing Functions (BPFs) among various RRHs. To estimate the resource savings achievable with MFRS, we formulate a routing and BPF placement problem. The goal is to minimize cost in terms of required BPFs under the constraints of latency and network capacity. Simulation results show significant improvement in terms of number of supported RRHs and required BPFs compared to two baseline schemes
Validation and comparison of microscopic car following models using real Beijing traffic flow data
No full textInterview: Professor Timothy Wu
No full textProfessor Tim Wu, one of the authors of the 2010–2011 OU community book, Who Controls the Internet?, visited Oakland in October of 2010. He gave a campuswide
presentation and visited with various other groups of students and faculty during his time on campus, including a brief interview with Writing and Rhetoric faculty members Dana Driscoll, Alice Horning, and Kasia Kietlinska, as well as a Writing and Rhetoric major,
Amanda Deschamps. Following is an edited version of the interview transcript
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