Gas insulated switchgear (GIS) plays a vital role in high voltage transmission of electrical energy due to its advantages of high reliability and performance, compact in dimensions and outstanding compatibility with the environment. It uses sulphur hexafluoride gas as its insulant and coolant because of its high dielectric strength and excellent arc quenching ability. Gas insulated switchgear i...

Bearing voltages and associated bearing currents in electric machines driven by pulsewidth modulation converters with high switching frequencies dv/dt can cause premature failures. This article proposes a new modeling approach for the prediction of steady-state transient based on two-dimensional (2-D) electromagnetic finite element analysis coupled external circuits using measured capacitance v...

We extend Hanaoka et al.’s parallel key-insulated mechanism to identity-based signature scenarios, and propose an identity-based parallel key-insulated signature scheme. The proposed scheme enjoys several attractive features: (i) it is provably secure without random oracles; (ii) it is strong key-insulated, and even if one of a user’s helper key and some of his temporary secret keys are exposed...

Certificate-based signature computation is often performed on insecure devices where the signature key is easy to be exposed. To reduce the influence of key exposure, we introduce key-insulated mechanism into certificate-based cryptography and formalize the notion and security model of the certificate-based key-insulated signature scheme. We then present a certificate-based key-insulated signat...

Single staggered is a design development of normal wire and tube heat exchanger that wires are welded with staggered configuration on two sides. Capacity of wire and tube heat exchanger is the ability of the heat exchanger to release heat. The objective of this study is to analyse the effect of wire pitch (pw) on capacity of single staggered wire and tube heat exchanger. The research...

Signcryption is a public key cryptographic technique that is particularly suited for mobile communications thanks to its light computational and communication overhead. The wide spread use of signcryption in a mobile computing environment, however, is accompanied by an increased risk of private key exposure. This paper addresses the issue of key exposure by proposing a key-insulated signcryptio...

Plasma actuators (PA) can be utilized as fluid control devices without moving parts, but further improvement in drive efficiency is necessary. Herein, string-type PAs with up to 12 insulated conductive wires were evaluated replace sheet-type having a single encapsulated electrode. The thrust–power ratio of eight or more nine times that single-wire PA. This due the substantial increase width ele...

The one-stage electrohydrodynamic (EHD) pumps with electrodes “a diaphragm – a plate hole” and wire are studied. It is established that the help of flow-limiting diaphragms, pump characteristics can be significantly improved. indicated in main multi-stage EHD pumps, it preferable to use lattice-type made bare perforated insulated wires. Optimal geometrical parameters electrodes, dielectric coat...

Insulated pressure vessels are cryogenic-capable pressure vessels that can be fueled with liquid hydrogen (LH2) or ambient-temperature compressed hydrogen (CH2). Insulated pressure vessels offer the advantages of liquid hydrogen tanks (low weight and volume), with reduced disadvantages (fuel flexibility, lower energy requirement for hydrogen liquefaction and reduced evaporative losses). The wor...