A series of Na3V2−xGax(PO4)3 (x = 0, 0.1, 0.2, 0.4 and 0.6) with in situ catalytic formation of graphene-like graphitic layer decoration are synthesized via a solid-state reaction process.
Extended‐counting A/D converters are proposed which achieve a high accuracy by performing the conversion in several cycles. During the first cycle, the circuit performs as an incremental ADC, while during the remaining ones it acts as a multi‐slope counting converter. With only one opamp and a single‐slope ADC, the accuracy is comparable to that of a second‐order incremental ADC. A three‐step A/D converter using only a single opamp and a two‐slope ADC achieves an accuracy comparable to that of a third‐order incremental ADC, but with much higher power efficiency.
Carbon-coated V2O3 hollow spheres are synthesized by a solvothermal route, with promising cycling stability and rate performance for PIBs. The homogeneous carbon coating improves the electronic conductivity and the hollow structure buffers the volume change during cycling.
with the wide implementation of distributed architecture, it brings new challenges to operation and maintenance. The number of system nodes and microservices increased exponentially, and the monitoring workload increased sharply. The relationship between monitoring objects is extremely complex, and human maintenance is not competent. The traditional maintenance mode is difficult to sustain due to data fragmentation and remote storage. Traditional operation and maintenance has the following shortcomings: 1) Due to the group / provincial two-level maintenance system, the operation and maintenance is decentralized. As a result, the whole network business support cannot be effectively controlled, and the whole network problem / fault scheduling system is not smooth. 2) The whole network monitoring system is built according to different businesses, with scattered monitoring data and backward monitoring methods, which leads to the difficulty of position problem across businesses. 3) Traditional maintenance is oriented to single system and single business, without focusing on end-to-end customer perception. 4) Single system cross domain or layer problem / fault processing is slow and time-consuming, and can not achieve accurate fault location and rapid fault recovery. This paper proposes an end-to-end intelligent monitoring system based on pinpoint. It is an intensive operation and maintenance platform for cloud systems, which can realize cross domain monitoring and cross IaaS/PaaS/SaaS layer monitoring. It is a shared operation and maintenance platform based on big data and AI technology to establish platform/application architecture. As for service, it can provide end-to-end cross service monitoring throughout the network. As for application, it can be used for the whole network to quickly find and locate faults. After using the end-to-end distributed cloud monitoring system, the fault discovery time is greatly shortened, and the fault handling is reduced from hour level to minute level. At the same time, the system fault time is greatly shortened, and the operation and maintenance efficiency is improved.
In this work the surface of LiNi0.5Mn1.5O4 (LMN) particles is modified by Mn3O4 coating through a simple wet grinding method, the electronic conductivity is significantly improved from 1.53×10−7 S/cm to 3.15×10−5 S/cm after 2.6 wt% Mn3O4 coating. The electrochemical test results indicate that Mn3O4 coating dramatically enhances both rate performance and cycling capability (at 55 °C) of LNM. Among the samples, 2.6 wt% Mn3O4-coated LNM not only exhibits excellent rate capability (a large capacity of 108 mAh/g at 10 C rate) but also shows 78% capacity retention at 55 °C and 1 C rate after 100 cycles.
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