Results 91 to 100 of about 8,709 (260)
Research on beamforming optimization in intelligent reflective surface-assisted wireless communication systems [PDF]
Quy Nhon University Journal of ScienceThis paper investigates the optimization of beamforming in intelligent reflecting surface (IRS)-assisted heterogeneous wireless communication systems, aiming to meet the stringent requirements of ultra-reliable low- latency communication (URLLC).
Do Dung Nguyen +2 more
doaj +1 more source
Convex relaxations of structured matrix factorizations
CoRR, 2013 We consider the factorization of a rectangular matrix $X $ into a positive linear combination of rank-one factors of the form $u v^\top$, where $u$ and $v$ belongs to certain sets $\mathcal{U}$ and $\mathcal{V}$, that may encode specific structures regarding the factors, such as positivity or sparsity.
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Flexoelectricity in Photoconversion: Fundamentals, Materials, and Outlooks
Advanced Science, EarlyView.Mechanical bending of a flexible cantilever induces a strain gradient in the photoactive material. The resulting flexoelectric field couples with photovoltaic and photoconductive effects, modulating charge generation, separation, and collection. A comparative analysis of oxide perovskites, halide perovskites, and two‐dimensional materials is presented,
Xiang Huang, Feng Li, Rongkun Zheng
wiley +1 more source
Target Localization in Wireless Sensor Networks Based on Received Signal Strength and Convex Relaxation. [PDF]
Sensors (Basel), 2022 Ding W, Zhong Q, Wang Y, Guan C, Fang B.
europepmc +1 more source
Convex quadratic and semidefinite programming relaxations in scheduling [PDF]
Journal of the ACM, 2001 We consider the problem of scheduling unrelated parallel machines subject to release dates so as to minimize the total weighted completion time of jobs. The main contribution of this paper is a provably good convex quadratic programming relaxation of strongly polynomial size for this problem. The best previously known approximation algorithms are based
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Strain‐Preserving Transfer of Freestanding Oxide Membranes for Tunable Magnetic Anisotropy
Advanced Science, EarlyView.An epoxy‐assisted exfoliation and transfer strategy circumvents the trade‐off between structural flexibility and strain tunability in freestanding oxide membranes. Epitaxial strain is effectively preserved, enabling versatile and robust control of magnetic anisotropy without sacrificing flexibility.
Jinfeng Zhang +13 more
wiley +1 more source
Advanced Science, EarlyView.The phase transition of supercritical CO2 induces the foaming of dense MXene film without compromise inherent structure of MXene nanosheet. The foamed porous MXene film manifests remarkable EMI shielding and infrared thermal camouflage performances. Moreover, the foaming strategy is broadly adaptable and can be extended to other two‐dimensional films ...
Hui Zhao +7 more
wiley +1 more source
Advanced Science, EarlyView.Conventional single‐gradient freeze‐casting typically produces unidirectional porous architectures with limited transverse connectivity. The Sequential Hybridization by Infiltration and Freeze‐casting Technique (SHIFT) addresses this constraint by integrating secondary aligned structures within a preformed primary scaffold.
Kiho Sung, Sungchul Shin
wiley +1 more source
International Journal of Electrical Power & Energy SystemsWith the accelerating integration of distributed energy resources (DERs) into grids, enhanced bidirectional interactions between distribution and transmission systems have significantly complicated grid coordination.
Zhe Chen +5 more
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Energies, 2019 For the controllability of the transmission power of DC transmission channels, the optimal power distribution (OPD) of AC-DC parallel transmission channels is an effective measure for improving the economic operation of an AC-DC interconnected power grid.
Shunjiang Lin +6 more
doaj +1 more source