294,389 research outputs found
Study of Liapunov Exponents and the Reversibility of Molecular Dynamics Algorithms
We study the question of lack of reversibility and the chaotic nature of the
equations of motion in numerical simulations of lattice QCD.Comment: latex file with 3 pages, 1 figure. Talk presented at Lattice'96 by C.
Li
Comment on "Entanglement transformation between two-qubit mixed states by LOCC" [Phys. Lett. A 373 (2009) 3610]
The paper [Phys. Lett. A 373 (2009) 3610] by D.-C. Li analyzes the
transformation between two-qubit mixed states by local operations and classical
communication. We show that the proof of the main theorem, Theorem 2.6 in
[Phys. Lett. A 373 (2009) 3610] is not complete. Therefore the generalization
of Nielsen's theorem to mixed states still remains an open problem.Comment: improved version due to the valuable suggestions of the two anonymous
referee
Optimization of SnO electron transport layer for efficient planar perovskite solar cells with very low hysteresisâ€
Nanostructured tin oxide (SnO) is a very promising electron transport layer (ETL) for perovskite solar cells (PSCs) that allows low-temperature processing in the planar n–i–p architecture. However, minimizing current–voltage (J–V) hysteresis and optimizing charge extraction for PSCs in this architecture remains a challenge. In response to this, we study and optimize different types of single- and bilayer SnO ETLs. Detailed characterization of the optoelectronic properties reveals that a bilayer ETL composed of lithium (Li)-doped compact SnO (c(Li)-SnO) at the bottom and potassium-capped SnO nanoparticle layers (NP-SnO) at the top enhances the electron extraction and charge transport properties of PSCs and reduces the degree of ion migration. This results in an improved PCE and a strongly reduced J–V hysteresis for PSCs with a bilayer c(Li)-NP-SnO ETL as compared to reference PSCs with a single-layer or undoped bilayer ETL. The champion PSC with c(Li)-NP-SnO ETL shows a high stabilized PCE of up to 18.5% compared to 15.7%, 12.5% and 16.3% for PSCs with c-SnO, c(Li)-SnO and c-NP-SnO as ETL, respectively
Review of Vegetables and Fruits: Nutritional and Therapeutic Values
The article reviews the book "Vegetables and Fruits: Nutritional and Therapeutic Values," by Thomas S. C. Li
Zero-forcing electrical filters for direct detection optical systems
Caption title.Includes bibliographical references (p. 1).Supported by the NSF. 9206379-NCRPeter C. Li and Pierre A. Humblet
LMS electrical filters to reduce intersymbol interference in direct detection optical systems
Caption title.Includes bibliographical references (p. 5).Supported by the NSF. 9206379-NCRPeter C. Li and Pierre A. Humblet
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