Hunan Changgao High Voltage Switchgear Group Co.

Changsha, China

Hunan Changgao High Voltage Switchgear Group Co.

Changsha, China

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Fan Q.,Hunan Police Academy | Liu X.-C.,Hunan Police Academy | Liu H.-Y.,Hunan University of Commerce | Zhang T.,Hunan Changgao High Voltage Switchgear Group Co.
Information Technology Journal | Year: 2013

The large-scale application of network heavily relies on the information security and the cryptography is the core of information security. The key escrow is one of the hot topics of encryption technology in recent years. As for the general key escrow scheme, the private key is divided into n parts and the private key can be reconstructed if k (k = n) escrow agents hand over their hosting parts. At the same time, one or several escrow parties can be also given several (fewer than k) key parts so as to have greater weight. But this is only the simplest weight consideration. The flexible set of the escrow parties (escrow agent) hasn't been considered in these schemes. In this paper, an important problem that is widely overlooked has been addressed, namely an escrow party is the most trusted or the most important who has the denial right. And the joint stratagem of all other agents is not workable over monitoring users without its participation. In this paper, the design of the key escrow scheme in which an escrow agent must participate has been described. The most important escrow party can be the notary public, the reliable department designated by the government or the authorities recognized by the government and the civil society. It should be cooperated with other escrow parties and the number of co-escrow parties should reach to the threshold value. Then the private key can be recovered. © 2013 Asian Network for Scientific Information.


Du J.,Central South University | Du J.,Hunan University of Technology | Xu L.,Central South University | Xu L.,Hunan University of Technology | And 2 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2013

Ni-W alloy coatings were prepared by electrodeposition technique with citric acid as a complexing agent. The influence of the main technical parameters on W content in the Ni-W alloy coatings were investigated by electron dispersive spectroscopy (EDS), and the microstructure of the coatings was characterized and analyzed by employing X-ray diffractometer (XRD), scanning electron microscope (SEM). The results showed that bright and compact Ni-W alloy coatings with 25.78 wt% W were obtained when the concentration of Na 2WO4 ·2H2O was 50 g/L, the concentration of NH4Cl was 20 g/L, the bath pH value was 8.0 and the bath temperature was 70 °C. The surface of Ni-W alloy coatings were bright, flat and compact, the mircostructure of the alloy coatings were nanocrystalline and the average grain size was about 38 nm by calculating using Scherrer Equation. Copyright © 2013 American Scientific Publishers All rights reserved.


Deng W.-H.,Hunan Changgao High Voltage Switchgear Group Co. | Huang Z.-X.,Hunan Changgao High Voltage Switchgear Group Co. | Zhang C.-Y.,Hunan Changgao High Voltage Switchgear Group Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2013

To develop ultra high voltage (UHV) bypass disconnectors for UHV series compensation equipment, UHV insulation, temperature rise by large current, and the issues in design of switching bus-transfer current device with high parameters were analyzed. According to the requirements of the UHV AC extension project, the manufactures determined an optimal design scheme, and assembled prototypes. The prototype UHV bypass disconnectors have completed the tests, and come into operation in the UHV project. The result shows that the disconnectors meet the requirements of UHV series compensation equipment with stable and reliable performance.

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