6,218 research outputs found
Average Consensus in Multiagent Systems with the Problem of Packet Losses When Using the Second-Order Neighbors’ Information
This paper mainly investigates the average consensus of multiagent systems with the problem of packet losses when both the first-order neighbors’ information and the second-order neighbors’ information are used. The problem is formulated under the sampled-data framework by discretizing the first-order agent dynamics with a zero-order hold. The communication graph is undirected and the loss of data across each communication link occurs at certain probability, which is governed by a Bernoulli process. It is found that the distributed average consensus speeds up by using the second-order neighbors’ information when packets are lost. Numerical examples are given to demonstrate the effectiveness of the proposed methods
An Estimation of “Energy” Magnitude Associated with a Possible Lithosphere-Atmosphere-Ionosphere Electromagnetic Coupling Before the Wenchuan MS8.0 Earthquake
A large scale of abnormities from ground-based electromagnetic parameters to ionospheric parameters has been recorded during the Wenchuan MS8.0 earthquake. All these results present different anomalous periods, but there seems one common climax leading to a lithosphere-atmosphere-ionosphere electromagnetic coupling (LAIEC) right on May 9, 3 days prior to the Wenchuan main shock. Based on the electron-hole theory, this chapter attempts to estimate the “energy source” magnitude driving this obvious coupling with the Wenchuan focus zone parameters considered. The simulation results show that the total surface charges fall in ~107–108 C, and the related upward electric field is ~108–109 V/m. These corresponding parameters are up to 109 C and 1010 V/m when the main rupture happens, and the order of the output current is up to 107 A. The electric field increasing in the interface between the Earth’s surface and the atmosphere, on one hand, can cause electromagnetic parameter abnormities of ground-based observation, with the range beyond 1000 km. On the other hand, it can accumulate air ionization above pre-earthquake zone and lead to ionospheric anomaly recorded by some spatial seismic monitoring satellites
Finite-Key Analysis for Coherent-One-Way Quantum Key Distribution
Coherent-one-way (COW) quantum key distribution (QKD) is a significant
communication protocol that has been implemented experimentally and deployed in
practical products due to its simple equipment requirements. However, existing
security analyses of COW-QKD either provide a short transmission distance or
lack immunity against coherent attacks in the finite-key regime. In this study,
we present a tight finite-key security analysis within the universally
composable framework for a new variant of COW-QKD, which has been proven to
extend the secure transmission distance in the asymptotic case. We combine the
Quantum Leftover Hash Lemma and entropic uncertainty relation to derive the key
rate formula. When estimating statistical parameters, we use the recently
proposed Kato's inequality to ensure security against coherent attacks and
achieve a higher key rate. Our work confirms the security and feasibility of
COW-QKD for practical application and lays the foundation for further
theoretical study and experimental implementation.Comment: 12 pages, 5 figure
Tris(2-ethyl-1H-imidazole-κN 3)(terephthalato-κO)zinc(II)
The title compound, [Zn(C8H4O4)(C5H8N2)3], has a neutral monomeric structure in which one terephthalate dianion and three 2-ethyl-1H-imidazole ligands coordinate to the ZnII ion in a distorted tetrahedral geometry. The methyl group of one of the ethyl groups is disordered over two positions with occupancies of 0.66 (2) and 0.34 (2). In the crystal structure, molecules are linked into a three-dimensional hydrogen-bonded network by intermolecular N—H⋯O interactions involving the uncoordinated carboxylate O atoms
Experimental Quantum Communication Overcomes the Rate-loss Limit without Global Phase Tracking
Secure key rate (SKR) of point-point quantum key distribution (QKD) is
fundamentally bounded by the rate-loss limit. Recent breakthrough of twin-field
(TF) QKD can overcome this limit and enables long distance quantum
communication, but its implementation necessitates complex global phase
tracking and requires strong phase references which not only add to noise but
also reduce the duty cycle for quantum transmission. Here, we resolve these
shortcomings, and importantly achieve even higher SKRs than TF-QKD, via
implementing an innovative but simpler measurement-device-independent QKD which
realizes repeater-like communication through asynchronous coincidence pairing.
Over 413 and 508 km optical fibers, we achieve finite-size SKRs of 590.61 and
42.64 bit/s, which are respectively 1.80 and 4.08 times of their corresponding
absolute rate limits. Significantly, the SKR at 306 km exceeds 5 kbit/s and
meets the bitrate requirement for live one-time-pad encryption of voice
communication. Our work will bring forward economical and efficient intercity
quantum-secure networks.Comment: 29 pages, 10 figures, 3 table
6-Chloro-3-nitro-N-(propan-2-yl)pyridin-2-amine
There are two molecules in the asymmetric unit molecule of the title compound, C8H10ClN3O2. Intramolecular N—H⋯O hydrogen bonds stabilize the molecular structure. There are no classical intermolecular hydrogen bonds in the crystal structure
Formation of a Salsolinol-like Compound, the Neurotoxin, 1-acetyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline, in a Cellular Model of Hyperglycemia and a Rat Model of Diabetes
There are statistical data indicating that diabetes is a risk factor for Parkinson\u27s disease (PD). Methylglyoxal (MG), a biologically reactive byproduct of glucose metabolism, the levels of which have been shown to be increase in diabetes, reacts with dopamine to form 1-acetyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline (ADTIQ); this formation may provide further insight into the connection between PD and diabetes. In this study, we investigated the role of ADTIQ in these two diseases to determine in an aim to enhance our understanding of the link between PD and diabetes. To this end, a cell model of hyperglycemia and a rat model of diabetes were established. In the cell model of hyperglycemia, compared with the control group, the elevated glucose levels promoted free hydroxyl radical formation (
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