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Zhang C.L.,Nantong Vocational College
Advanced Materials Research

The traditional LCL-filter third-order system grid-connected inverter may cause the resonance phenomenon without damping. Also, it will be affected by the distorted grid-voltage background harmonics. In order to overcome these problems, based on the passive damping method, a new control strategy is proposed. The paper analyses the current waveform performance of grid-connected inverter in the condition of grid-voltage background harmonics, derives the feed-forward function for grid-connected inverter. The disadvantages of passive damping could be well solved by damping resistor virtualization of the original system, which realized the active damping suppression of resonance. Simulation results based on the Heric single-phase transformerless grid-connected inverter verify the correctness of the theoretical analysis. © (2013) Trans Tech Publications, Switzerland. Source

Shu H.,Nantong Vocational College
Advanced Materials Research

Efficiency is becoming increasingly important in grid connected photovoltaic inverter design. Transformer in grid connected inverter system is removed to improve the efficiency of system. Traditional Power loss calculation methods often neglected ripple current effects. However, Photovoltaic inverters seldom operate at the maximum rated power due to variation of irradiation. Therefore, the ripple current effects on component power loss on the light load condition should not be neglected. The paper analyzes the work principle of a transformerless grid connected inverter in detail, and establishes a mathematical model of component power loss which includes ripple current effects. An experimental prototype is made and experiment results verify the correctness of the theoretical analysis. © (2013) Trans Tech Publications, Switzerland. Source

Huang H.,Soochow University of China | Huang H.,Nantong Vocational College | Wang C.,Soochow University of China | Huang J.,Soochow University of China | And 4 more authors.

Highly ordered N-doped mesoporous niobium oxide (NMNb) was prepared via a facile solid state reaction method using urea as a nitrogen source. The mesoporous structure of niobium oxide (MNb) is beneficial to the N dopant that is effectively incorporated into the lattice of MNb, resulting in a significantly enhanced visible light response. The hydrogen generation efficiency over the optimized N-doped MNb photocatalyst was 14.8 times as high as that from N-P25 under 5 h visible light irradiation. The improved photocatalytic activity of NMNb was mainly due to the fact that the inherited ordered mesostructure of NMNb could offer more active sites for the photocatalytic reaction, as well as accelerate the photogenerated electron-hole pair transfer and separation. © 2014 the Partner Organisations. Source

Zhou J.,Yangzhou University | Zhou J.,Nantong Vocational College | Chen M.,Yangzhou University | Xie J.,Yangzhou University | Diao G.,Yangzhou University
ACS Applied Materials and Interfaces

An amphiphilic pillar[5]arene (AP5) was modified onto the surface of reduced graphene oxide (RGO) to form the water-dispersive RGO-AP5 nanocomposite. And then, as-prepared gold nanoparticles (AuNPs) self-assembled onto the surface of RGO-AP5 through amido groups of AP5 to achieve RGO-AP5-AuNPs nanocomposites. It was verified that a large amount of AP5 molecules had been effectively loaded onto the surface of RGO and lots of AuNPs could be uniformly dispersed on RGO-AP5. Electrochemical results showed that the RGO-AP5 could exhibit selective supramolecular recognition and enrichment capability toward guest molecules. More significantly, in electrochemical sensing the guest molecules, ternary nanocomposites RGO-AP5-AuNPs performed the synergetic action of multifunctional properties, which were excellent performances of RGO, selective supramolecular recognition, and enrichment capability of AP5 and catalytic property of AuNPs for guest molecules. Therefore, RGO-AP5-AuNPs showed an outstanding analyzing performance for DA with broad linear range (1.5 × 10-8 to 1.9×10-5 M) and low detection limit (1.2 × 10-8 M) at a signal-to-noise ratio of 3. © 2013 American Chemical Society. Source

Zhou J.,Nantong Vocational College | Zhou J.,Yangzhou University | Chen M.,Yangzhou University | Diao G.,Yangzhou University
ACS Applied Materials and Interfaces

A new amphiphilic pillar[5]arene (AP5-glycol) with five oligomeric glycol groups and five alkyl chains was prepared. AP5-glycol spontaneously formed bilayer vesicles in water, and these vesicles were still stable after several weeks. Additionally, when they were exposed to external physical stimuli, these vesicles also showed reversible thermal and dynamic properties. Interestingly, oleic-acid-stabilized magnetic iron oxide nanoparticles could be incorporated into the bilayer of the AP5-glycol vesicles to form hybrid magnetic-responsive supramolecular vesicles. © 2014 American Chemical Society. Source

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