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Ning H.,University of Science and Technology Beijing | Ning H.,Xinjiang Joinworld Co. | Zheng X.,University of Science and Technology Beijing
International Review on Computers and Software | Year: 2012

This document specifies the Transport Layer Security supported MECC algorithm for the internet of Things. The protocol provides communications security over the Internet. The protocol allows client/server applications to communicate in a way that is designed to prevent eavesdropping, tampering, or message forgery. This paper introduced application situation of RSA (Rivest, Shamir and Adleman) algorithm and MECC (Modified Elliptic curve cryptography) algorithm, and modified the security protocol and supported the MECC algorithm, at last, proposed a security protocol at transport layer supported MECC algorithm. According to the security protocol (RFC4346 TLS1.1) and application demands, this paper added authentication mode and key exchange about MECC, and abolished the DH key negotiation, and modified the definition of key suite. © 2012 Praise Worthy Prize S.r.l. - All rights reserved.


Liang X.-P.,Central South University | Li H.-Z.,Central South University | Huang L.,Central South University | Hong T.,Xinjiang Joinworld Co. | And 2 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2012

Target made of 2519-T87 aluminum alloy was obliquely impacted by a projectile. Microstructural evolution around the crater was investigated by optical microscopy (OM), transmission electron microscopy (TEM), and electron backscattered diffraction (EBSD). The micro-hardness distribution near the crater after impact was studied. The results indicate that at the entering stage, the amount of adiabatic shear band (ASB) is the most, and the precipitates are as fine as those of the target material; the micro-hardness is higher than that at the other stages. At the stable-running stage, the amount of ASB reduces as the micro-bands increase; the precipitates tend to coarsen, which leads to the decrease of the micro-hardness. At the leaving stage, there is a large amount of micro-bands; the precipitates are refined, and the micro-hardness is higher than that at the stable-running stage. The difference in the micro-hardness of the impact stages is due to work hardening and precipitate coarsening, which is caused by adiabatic temperature rise in the alloy. © 2012 The Nonferrous Metals Society of China.


Liang X.-P.,Central South University | Li H.-Z.,Central South University | Li Z.,Central South University | Hong T.,Xin Jiang Joinworld Co. | And 3 more authors.
Materials and Design | Year: 2012

The microhardness, grain size and distribution of the precipitates in various zones of a 2519-T87 aluminum alloy welded joint welded by friction stir welded were investigated. The dynamic recrystallization occurred in the weld nugget zone and the size of recrystallized grains was smaller than that in the thermo-mechanically affected zone, besides, θ' and θ phase precipitated. The thermo-mechanically affected zone was divided into three ones: the zone close to the thermo-mechanically affected zone, where coarse θ' precipitates were observed; the middle zone, where the mainly θ precipitates appeared; and the zone close to the heat-affected zone, where both thin θ' and θ precipitates were observed. In the heat-affected zone, the size of θ' precipitates was less than those in the base metal zone. On the transverse cross-section of welded joint the microhardness curve shows a W-shape. © 2011 Elsevier Ltd.


Zuo H.,Northeastern University China | Zuo H.,Xinjiang Joinworld Co. | Liu C.-M.,Northeastern University China
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2012

The influences of the Zn content on the corrosion structure as well as the specific capacitance of the aluminum anode foils used in high voltage electrolytic capacitors were investigated. The cube texture of the foils was characterized by X-ray diffractometer (XRD) quantitatively and the distribution of Zn in the foils was measured by secondary ion mass spectrometer (SIMS). The corrosion structure of the etched foils was characterized by scanning electron microscope (SEM). The results show that when the Zn content of the foils varies from 1.9×10-6 (mass fraction) to 2.0×10-5, the cubic texture maintains at 95% (volume fraction), the surface segregation of Zn significantly increases, the corrosion structure becomes more homogeneous and the specific capacitance of the anode foils measured at 520 V increases from 0.666 μF/cm2 to 0.689 μF/cm2.


Ning H.,University of Science and Technology Beijing | Ning H.,Xinjiang Joinworld Co. | Zheng X.F.,University of Science and Technology Beijing
Applied Mechanics and Materials | Year: 2013

RFID belongs to the basic input device in the IOT(Internet of Things) applications. The country has attached much importance to the technique and application of IOT, and RFID has been widely used in logistics, warehousing, traffic, cattle raising and some other industries. The thesis employs MFRC531 chip and Atmel 89C518 bit microprocessors to design and realize a RFID card reader which can be characterized by simple circuits, easy to realize and convenient to debug. Thus, it may be referred by IOT technicians. © (2013) Trans Tech Publications, Switzerland.


Patent
Xinjiang Joinworld Co. | Date: 2010-12-30

A manufacturing method of an anode foil for an aluminum electrolytic capacitor is provided, which comprises a first step of forming a porous oxide film, i.e. subjecting an etched foil having etched holes thereon to an anodic oxidation process to form a porous oxide film on both the outer surface of the etched foil and the inner surface of etched holes, and a second step of forming a dense oxide film, i.e. converting the porous oxide film into the dense oxide film. The method can be used to manufacture an anode foil for various voltage ranges, e.g. an ultra-high voltage anode foil whose voltage is more than 800 vf, and the method can increase specific capacity, reduce power consumption, simplify the process, and increase production efficiency.


Provided is a method for preparing high-purity aluminum by directional solidification, comprising the steps of: providing 4N to 5N aluminum as raw material, heating the same to a temperature of 670 C to 730 C, maintaining the temperature for 7 minutes to 80 minutes, cooling the bottom of chamber (3) to allow the aluminum liquid crystallizing in a direction from the bottom to top of the chamber (3) for 1 hour to 8 hours to obtain a crystalline ingot, during the crystallization process of a finished product of crystalline ingot, stirring and heating the aluminum liquid, maintaining a particular temperature gradient of the aluminum liquid, and removing a portion of the crystalline ingot from one end of the ingot, the remaining portion being the high-purity aluminum. Also provided is a smelting furnace, comprising a shell (1), a heating device (2), a chamber (3), a temperature measurement device, a stirring device and a cooling device (6).


Provided is a method for preparing high-purity aluminum by directional solidification, comprising the steps of: providing 4N to 5N aluminum as raw material, heating the same to a temperature of 670 C. to 730 C., maintaining the temperature for 7 minutes to 80 minutes, cooling the bottom of chamber (3) to allow the aluminum liquid crystallizing in a direction from the bottom to top of the chamber (3) for 1 hour to 8 hours to obtain a crystalline ingot, during the crystallization process of a finished product of crystalline ingot, stifling and heating the aluminum liquid, maintaining a particular temperature gradient of the aluminum liquid, and removing a portion of the crystalline ingot from one end of the ingot, the remaining portion being the high-purity aluminum. Also provided is a smelting furnace, comprising a shell (1), a heating device (2), a chamber (3), a temperature measurement device, a stirring device and a cooling device (6).


Patent
Xinjiang Joinworld Co. | Date: 2010-12-30

A manufacturing method of an anode foil for an aluminum electrolytic capacitor is provided, which comprises a first step of forming a porous oxide film, i.e. subjecting an etched foil having etched holes thereon to an anodic oxidation process to form a porous oxide film on both the outer surface of the etched foil and the inner surface of etched holes, and a second step of forming a dense oxide film, i.e. converting the porous oxide film into the dense oxide film. The method can be used to manufacture an anode foil for various voltage ranges, e.g. an ultra-high voltage anode foil whose voltage is more than 800 vf, and the method can increase specific capacity, reduce power consumption, simplify the process, and increase production efficiency.


Patent
Xinjiang Joinworld Co. | Date: 2013-11-06

A manufacturing method of an anode foil for an aluminum electrolytic capacitor is provided, which comprises a first step of forming a porous oxide film, i.e. subjecting an etched foil having etched holes thereon to an anodic oxidation process to form a porous oxide film on both the outer surface of the etched foil and the inner surface of etched holes, and a second step of forming a dense oxide film, i.e. converting the porous oxide film into the dense oxide film. The method can be used to manufacture an anode foil for various voltage ranges, e.g. an ultra-high voltage anode foil whose voltage is more than 800 vf, and the method can increase specific capacity, reduce power consumption, simplify the process, and increase production efficiency.

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