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GPS误差模型参数估计的Hopfield神经网络方法 总被引:2,自引:2,他引:2
本文首先建立了GPS误差模型。然后,利用Hopfield神经网络(HNN)方法对误差模型参数进行了估计,并给出了其硬件实现方法。将估计结果与传统的最小二乘(LS)估计进行比较,证明了神经网络方法的有效性。 相似文献
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Lingling Peng Duixiong Sun Maogen Su Jiantong Han Chenzhong Dong 《Optics & Laser Technology》2012,44(8):2469-2475
Laser-induced breakdown spectroscopy (LIBS) technique was used to investigate the applicability for the rapid analysis on the heavy metals in spent Zn–Mn batteries. Besides the major elements carbon and zinc, a number of minor and trace elements, such as iron, manganese, vanadium, chromium, aluminum, silicon, calcium, copper, magnesium and lead were identified in the positive and negative electrode materials, and their concentrations were determined. It was found that the concentrations of heavy metals of vanadium, vanadium, manganese, zinc, iron and copper were high in the mixture of positive electrode material, while zinc and lead had high concentration in the negative electrode material. These heavy metals are of a great harm to the environment and human health. 相似文献
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Inkjet printing of 2D layered materials, such as graphene and MoS2, has attracted great interests for emerging electronics. However, incompatible rheology, low concentration, severe aggregation and toxicity of solvents constitute critical challenges which hamper the manufacturing efficiency and product quality. Here, we introduce a simple and general technology concept (distillation‐assisted solvent exchange) to efficiently overcome these challenges. By implementing the concept, we have demonstrated excellent jetting performance, ideal printing patterns and a variety of promising applications for inkjet printing of 2D layered materials. 相似文献
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Jianwei Li Guangcheng Zhang Jiantong Li Lisheng Zhou Zhanxin Jing Zhonglei Ma 《先进技术聚合物》2017,28(1):28-34
In this study, a series of reinforced polyimide (PI)/carbon fiber (CF) composite foams were fabricated through thermal foaming of polyester ammonium salt (PEAS) precursor powders. The PEAS precursor powders containing different contents of chopped CF were synthesized from benzophenone‐3,3′,4,4′‐tetracarboxylic dianhydride (BTDA) and 4,4′‐diaminodiphenyl ether (ODA). The effects of different CF loadings on foaming behavior of PEAS/CF composite precursor powders, final cellular morphology, and physical properties of PI composite foams were investigated. The results revealed that the chopped CF acted as nucleation agent in the foaming process. The dispersion of CF can be evaluated using digital microscope. It is interesting to find that the chopped CF were highly oriented along the direction of cell arrises. As a result, the mechanical properties of PI foams were significantly enhanced owing to the incorporation of chopped CF. Furthermore, the thermal stability of PI composite foams were also slightly improved owing to fine dispersion of CF. In addition, the PI/CF composite foam shows uniform cell size distribution and the best comprehensive physical properties as chopped CF loading at around 6 wt%. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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天然水体中痕量微囊藻毒素的高效液相色谱测定方法优化 总被引:14,自引:0,他引:14
以微囊藻毒素LR(MC-LR)和微囊藻毒素RR(MC.RR)为材料,主要通过调节杂质淋洗液和毒素洗脱液中甲醇、水和三氟乙酸(TFA)的配比来改变极性和PH值,对高效液相色谱(HPLC)法分析MC环境样品的方法进行了优化。结果表明,含0.1%TFA的40%-45%的甲醇水溶液可以取得较好的杂质淋洗效果;含0.1%TFA的70%的甲醇水溶液可以将固相萃取柱(SPE)上的MC完全洗下。因此,建议在分析杂质较多的环境样品时,使用含0.1%TFA的40%-45%的甲醇水溶液对杂质进行淋洗,然后用含0.1%TFA的70%-100%甲醇水溶液对Mc进行洗脱。 相似文献
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本文分析了测定均匀材料导温系数的一个数学模型并给出了该问题解的存在性,唯一性和稳定性条件. 相似文献
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Tianliang Yu Youfu Wang Kaiyue Jiang Prof. Guangqun Zhai Dr. Changchun Ke Dr. Jichao Zhang Dr. Jiantong Li Dr. Diana Tranca Prof. Emmanuel Kymakis Prof. Xiaodong Zhuang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(20):6340-6347
Coordination polymer frameworks (CPFs) have broad applications due to their excellent features, including stable structure, intrinsic porosity, and others. However, preparation of thin-film CPFs for energy storage and conversion remains a challenge because of poor compatibility between conductive substrates and CPFs and crucial conditions for thin-film preparation. In this work, a CPF film was prepared by the coordination of the anisotropic four-armed ligand and CuII at the liquid–liquid interface. Such film-based micro-supercapacitors (MSCs) are fabricated through high-energy scribing and electrolytes soaking. As-fabricated MSCs displayed high volumetric specific capacitance of 121.45 F cm−3. Besides, the volumetric energy density of MSCs reached 52.6 mWh cm−3, which exceeds the electrochemical performance of most reported CPF-based MSCs. Especially, the device exhibited alternating current (AC) line filtering performance (−84.2° at 120 Hz) and a short resistance capacitance (RC) constant of 0.08 ms. This work not only provides a new CPF for MSCs with AC line filtering performance but also paves the way for thin-film CPFs preparation with versatile applications. 相似文献