6,661 research outputs found
An investigation of air and water dual adjustment decoupling control of surface heat exchanger
The terminal equipment of central cooling system accounts for a significant proportion of the total system's energy consumption. Therefore, it is important to reduce the terminal equipment energy consumption in central air conditioning system. In this study, the difference of the effect of the chilled water flow rate and air supply rate on the surface cooler during the heat transfer process is taken into full account. Matlab/Simulink simulation software is used to model and simulate the heat transfer of surface cooler of the main terminal equipment of air conditioning system. Simulation tests and experimental validations are conducted by using variable chilled water flow rate and variable air supply rate control mode separately. The experiment results show that the simulation model can effectively predict the heat transfer performance of heat exchanger. Further, the study introduced a dual feedback control mode, which synchronously regulates the chilled water flow rate and air supply rate. Also, under certain conditions, the complex heat transfer process of the surface cooler can be decoupled, and single variable control pattern is used to separately regulate the chilled water flow rate and air supply rate. This can effectively shorten the system regulation time, reduce overshoot and improve control performance
Encoding a qubit with Majorana modes in superconducting circuits
Majorana fermions are long-sought exotic particles that are their own
antiparticles. Here we propose to utilize superconducting circuits to construct
two superconducting-qubit arrays where Majorana modes can occur. A so-called
Majorana qubit is encoded by using the unpaired Majorana modes, which emerge at
the left and right ends of the chain in the Majorana-fermion representation. We
also show this Majorana qubit in the spin representation and its advantage,
over a single superconducting qubit, regarding quantum coherence. Moreover, we
propose to use four superconducting qubits as the smallest system to
demonstrate the braiding of Majorana modes and show how the states before and
after braiding Majoranas can be discriminated.Comment: 10 pages, 3 figures; an enlarged version of arXiv: 1108.3712v
Reprogrammable plasmonic topological insulators with ultrafast control
Topological photonics has revolutionized our understanding of light propagation, providing a robust way to manipulate light. So far, most of studies in this field are focused on designing a static photonic structure. Developing a dynamic photonic topological platform to switch multiple topological functionalities at ultrafast speed is still a great challenge. Here we theoretically propose and experimentally demonstrate a reprogrammable plasmonic topological insulator, where the topological propagation route can be dynamically changed at nanosecond-level switching time, leading to an experimental demonstration of ultrafast multi-channel optical analog-digital converter. Due to the innovative use of electric switches to implement the programmability of plasmonic topological insulator, each unit cell can be encoded by dynamically controlling its digital plasmonic states while keeping its geometry and material parameters unchanged. Our reprogrammable topological plasmonic platform is fabricated by the printed circuit board technology, making it much more compatible with integrated photoelectric systems. Furthermore, due to its flexible programmability, many photonic topological functionalities can be integrated into this versatile topological platform
Implementing topological quantum manipulation with superconducting circuits
A two-component fermion model with conventional two-body interactions was
recently shown to have anyonic excitations. We here propose a scheme to
physically implement this model by transforming each chain of two two-component
fermions to the two capacitively coupled chains of superconducting devices. In
particular, we elaborate how to achieve the wanted operations to create and
manipulate the topological quantum states, providing an experimentally feasible
scenario to access the topological memory and to build the anyonic
interferometry.Comment: 4 pages with 3 figures; V2: published version with minor updation
Improved Goldstein Interferogram Filter Based on Local Fringe Frequency Estimation
The quality of an interferogram, which is limited by various phase noise, will greatly affect the further processes of InSAR, such as phase unwrapping. Interferometric SAR (InSAR) geophysical measurements’, such as height or displacement, phase filtering is therefore an essential step. In this work, an improved Goldstein interferogram filter is proposed to suppress the phase noise while preserving the fringe edges. First, the proposed adaptive filter step, performed before frequency estimation, is employed to improve the estimation accuracy. Subsequently, to preserve the fringe characteristics, the estimated fringe frequency in each fixed filtering patch is removed from the original noisy phase. Then, the residual phase is smoothed based on the modified Goldstein filter with its parameter alpha dependent on both the coherence map and the residual phase frequency. Finally, the filtered residual phase and the removed fringe frequency are combined to generate the filtered interferogram, with the loss of signal minimized while reducing the noise level. The effectiveness of the proposed method is verified by experimental results based on both simulated and real data
Resonant peak splitting for ballistic conductance in magnetic superlattices
We investigate theoretically the resonant splitting of ballistic conductance
peaks in magnetic superlattices. It is found that, for magnetic superlattices
with periodically arranged identical magnetic-barriers, there exists a
general -fold resonant peak splitting rule for ballistic conductance,
which is the analogy of the -fold resonant splitting for transmission in
-barrier electric superlattices (R. Tsu and L. Esaki, Appl. Phys. Lett. {\bf
22}, 562 (1973)).Comment: 9 pages, 3 figures, latex forma
Pumping vortex into a Bose-Einstein condensate of heteronuclear molecules
Heteronuclear molecules attract wide attention due to their permanent
electric dipole moments. Analogous to atoms with magnetic dipoles, the
existence of nonzero electric dipoles significantly enhance possibilities and
mechanisms for control and design of quantum degenerate molecule systems with
electric (E-) fields. This work proposes a vortex creation mechanism inside a
condensate of heteronuclear molecules through the adiabatic flipping of the
axial bias of an analogous E-field Ioffe-Pritchard trap (IPT), extending the
original protocol due to Ishoshima, {\it et al.}, [Phys. Rev. A \textbf{61},
063610 (2000)] for an atomic spinor condensate inside a magnetic (B-) field
IPT. We provide both analytic proof and numerical simulations to illustrate the
high fidelity operation of this vortex pump protocol. We hope our work provides
stimulating experimental possibilities for the active investigations in quantum
degenerate molecule systems.Comment: 10 pages, 2 figure
Statistical experimental methods for optimizing the cultivating conditions for Rhodococcus erythropolis
Rhodococcus erythropolis was found to effectively degrade aflatoxin Bl produced by Aspergillus flavus and Aspergillus parasiticus. However, one problem of concern was the slow growth of this strain. In this study, Plackett–Burman design was used to select the most important variables, namely, temperature, pH, inoculum size, liquid volume, agitation speed and culture time that affected the growth of R. erythropolis. Central composite experimental design and response surface analysis were adopted to derive a statistical model for optimizing the culture conditions. From the obtained results, it can be concluded that the optimum parameters were: temperature, 15.3°C; pH, 5.56; inoculum size, 4%; liquid volume, 70 ml in 250 ml flask; agitation speed, 180 rpm; and culture time, 58.2 h. At this optimum point, the populations of the viable organisms could reach 108 colony forming units (CFU)/ml, which was 100 times higher than that incubated under the initial conditions. After 58.2 h incubation in this optimum cultivating conditions, 53.9 ± 2.1% of aflatoxin B1 was degraded, while only 20.6±1.4% of aflatoxin B1 was degraded in the initial conditions.Key words: Rhodococcus erythropolis, culture condition, optimization, Plackett–Burman design, central composite design, response surface methodology
Confidence and Backaction in the Quantum Filter Equation
We study the confidence and backaction of state reconstruction based on a
continuous weak measurement and the quantum filter equation. As a physical
example we use the traditional model of a double quantum dot being continuously
monitored by a quantum point contact. We examine the confidence of the estimate
of a state constructed from the measurement record, and the effect of
backaction of that measurement on that state. Finally, in the case of general
measurements we show that using the relative entropy as a measure of confidence
allows us to define the lower bound on the confidence as a type of quantum
discord.Comment: 9 pages, 6 figure
Tomographic measurements on superconducting qubit states
We propose an approach to reconstruct any superconducting charge qubit state
by using quantum state tomography. This procedure requires a series of
measurements on a large enough number of identically prepared copies of the
quantum system. The experimental feasibility of this procedure is explained and
the time scales for different quantum operations are estimated according to
experimentally accessible parameters. Based on the state tomography, we also
investigate the possibility of the process tomography.Comment: 12 pages, 4 figure
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