2,638 research outputs found
Correlation-hole induced paired quantum Hall states in lowest Landau level
A theory is developed for the paired even-denominator fractional quantum Hall
states in the lowest Landau level. We show that electrons bind to quantized
vortices to form composite fermions, interacting through an exact instantaneous
interaction that favors chiral p-wave pairing. Two canonically dual pairing gap
functions are related by the bosonic Laughlin wavefunction (Jastraw factor) due
to the correlation holes. We find that the ground state is the Moore-Read
pfaffian in the long wavelength limit for weak Coulomb interactions, a new
pfaffian of an oscillatory pairing function for intermediate interactions, and
a Read-Rezayi composite Fermi liquid beyond a critical interaction strength.
Our findings are consistent with recent experimental observations of the 1/2
and 1/4 fractional quantum Hall effects in asymmetric wide quantum wells.Comment: 4 pages, 2 figures; published versio
Unlocking the flexibility of combined heat and power for frequency response by coordinative control with batteries
Owners of combined heat and power (CHP), e.g., industrial manufacturers, are motivated to provide frequency response to power grids due to clear financial benefits. Yet, the slow response speed of CHP limits its capability in providing such services. Moreover, frequent adjustments would cause a faster lifetime reduction of CHP and rapid pressure fluctuation in the gas network. To further unlock the flexibility of CHP, this paper integrates a battery unit with CHP via a power electronic interface. A filter-based coordinative controller is designed for smoothing short-term fluctuations in CHP outputs. Based on the filter parameters and frequency response requirements, the minimum required capacity of the battery is identified. The results show that the proposed system enhances the capability of CHP for frequency response and mitigates the associated adverse effects on the gas network. The required capacity of the battery is economically feasible considering the benefit it brings to the CHP
Design of Reconfigurable Intelligent Surface-Aided Cross-Media Communications
A novel reconfigurable intelligent surface (RIS)-aided hybrid
reflection/transmitter design is proposed for achieving information exchange in
cross-media communications. In pursuit of the balance between energy efficiency
and low-cost implementations, the cloud-management transmission protocol is
adopted in the integrated multi-media system. Specifically, the messages of
devices using heterogeneous propagation media, are firstly transmitted to the
medium-matched AP, with the aid of the RIS-based dual-hop transmission. After
the operation of intermediate frequency conversion, the access point (AP)
uploads the received signals to the cloud for further demodulating and decoding
process. Based on time division multiple access (TDMA), the cloud is able to
distinguish the downlink data transmitted to different devices and transforms
them into the input of the RIS controller via the dedicated control channel.
Thereby, the RIS can passively reflect the incident carrier back into the
original receiver with the exchanged information during the preallocated slots,
following the idea of an index modulation-based transmitter. Moreover, the
iterative optimization algorithm is utilized for optimizing the RIS phase,
transmit rate and time allocation jointly in the delay-constrained cross-media
communication model. Our simulation results demonstrate that the proposed
RIS-based scheme can improve the end-to-end throughput than that of the
AP-based transmission, the equal time allocation, the random and the discrete
phase adjustment benchmarks
State-of-the-art analysis and perspectives for peer-to-peer energy trading
As a promising solution to address the “energy trilemma” confronting human society, peer-to-peer (P2P) energy trading has emerged and rapidly developed in recent years. When carrying out P2P energy trading, customers with distributed energy resources (DERs) are able to directly trade and share energy with each other. This paper summarizes and analyzes the global development of P2P energy trading based on a comprehensive review of related academic papers, research projects, and industrial practice. Key aspects in P2P energy trading are identified and discussed, including market design, trading platforms, physical infrastructure and information and communication technology (ICT) infrastructure, social science perspectives, and policy. For each key aspect, existing research and practice are critically reviewed and insights for future development are presented. Comprehensive concluding remarks are provided at the end, summarizing the major findings and perspectives of this paper. P2P energy trading is a growing field with great potential and opportunities for both academia and industry across the world
Intercellular competitive growth dynamics with microenvironmental feedback
Changes in the state of the microenvironment in organisms can affect cellular
interactions. In this paper, we introduce the microenvironmental feedback
mechanism to the growth dynamics of multicellular organisms, where
microenvironmental feedback can affect the growth of multicellular organisms by
changing the cellular competitive ability. We show that the microenvironmental
feedback mechanism can delay aging, but cancer cells will grow uncontrollably
due to the emergence of the tumor microenvironment(TME). We investigate the
effect of the feedback rate of cancer cell fitness to the microenvironment and
find the average lifespan shortened is close to the data for non-Hodgkin
lymphoma in Canada from 1980 to 2015. We also study the impact of the
competitive ability of cancer cells on the lifespan of the organism and find
that there is an optimal value of cancer cell competitive ability that makes
the organism live the longest under the same conditions. These results will
provide mathematical theoretical help for targeted therapies aimed at TME
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