The Al2O3-SiC reinforced Al7075 Metal Matrix Composite (MMCs) is fabricated through liquid metallurgical technique. Ceramic particulates were amalgamated into aluminium alloy to achieve improved mechanical properties and wear resistance. Al-7075/Al2O3/SiC hybrid MMCs produced by reinforcing 2%, 3%, 4% 5% of Al2O3 7% SiC particles. Microstructural analysis was carried out evaluate the uniform di...

Voltage source converters (VSCs) with self-commutation ability are suitable for interconnecting weak ac systems. This article conducts a comparative study of the small-signal stability characteristics three typical VSCs, namely, two-level VSCs (TL-VSCs), half-bridge modular multilevel (HB-MMCs), and hybrid MMCs (HY-MMCs), under system integration special consideration on both inverter rectifier...

Carbon-based nanomaterials mainly including carbon nanotubes (CNTs), graphene, and graphene oxide (GO) have superior properties of low density, outstanding strength, high hardness. Compared with ceramic reinforcements, small amount carbon-based can significantly improve the mechanical metal matrix composites (MMCs) (CMCs). However, CNTs graphite always aggregate or degrade during fabrication a ...

Abstract Modular multilevel converters (MMCs) are extensively used in flexible high-voltage DC transmission systems. As an important part of them, it plays role the normal use MMCs. The main additional loss system is generated by second harmonic circulating current. By summarizing and comparing current circulation control strategies. Based on research status suppression, we prospect direction M...

This paper presents a feasibility study of an offshore wind farm (OWF) HVDC integration system using high-temperature superconductor (HTS) DC cables. A representative ±100 kV/2 GW point-to-point OWF is proposed including HTS cables and two converter stations modular multilevel converters (MMCs). To be compatible with the high current rating cables, each onshore consists three MMCs in parallel. ...

One of the most widely used media delivery technology across Internet is streaming. It enables users to receive multimedia content and provides some control functionality over the media. Videoconferencing technologies such as H.323, SIP and AccessGrid, provide audio and visual interactive environment to their clients. We have developed Global multimedia Conferencing System (Global MMCS), which ...

In the field of artificial intelligence (AI), the subdomain of knowledge representation (KR) has the aim to represent, integrate, and exchange knowledge in order to do some reasoning about the given information. During the last decades many different KR-languages were proposed for a variety of certain applications with specific needs. The concept of a managed Multi-Context System (mMCS) was int...

This paper presents a mechanics model for predicting the forces of cutting aluminum-based SiC/Al2O3 particle reinforced MMCs. The force generation mechanism was considered to be due to three factors: (a) the chip formation force, (b) the ploughing force, and (c) the particle fracture force. The chip formation force was obtained by using Merchant’s analysis but those due to matrix ploughing defo...

Metal matrix composites (MMCs) exhibit improved strength but suffer from low ductility. Metal particles reinforcement can be an alternative to retain the ductility in MMCs (Bauri and Yadav, 2010; Thakur and Gupta, 2007) [1,2]. However, processing such composites by conventional routes is difficult. The data presented here relates to friction stir processing (FSP) that was used to process metal ...

Modular multilevel converters (MMCs) are widely utilized in dc applications. With the development of MMCs, many applications require MMCs to have additional functions and characteristics, such as fault clearing capability low submodule capacitance. A unidirectional current H-bridge (UCH-SM) has been proposed, which uses capacitance possesses capability. However, reactive power is limited during...