Advanced Materials Research Vols. 282-283

Abstract: Conducting attapulgite/titania/polyaniline/ (ATP/TiO₂/PANI) core-shell nanocomposites (CSNs) were synthesized via oxidative polymerization of aniline after the surface modification of the ATP carried with TiO₂ nanoparticles. The structure and morphology of the ATP/TiO₂/PANI CSNs were characterized by X-ray diffraction, scanning electron microscopy, and fourier transform infrared. The thermal stability of the ATP/TiO₂/PANI CSNs was also investigated by thermal analyzer. The results show that the ATP/TiO₂/PANI CSNs display “capsule like” core-shell structure, of which ranging in diameter of about 80 nm and length of about 250 nm. In addition, the ATP/TiO₂/PANI CSNs present a higher degree of crystallization and better thermal stability. We believe that the excellent core-shell structure and better thermal stability should be prone to improve their other properties and enlarge their application.

Abstract: This paper introduces the development history of fuzzy logic and its application in network security evaluation. The main content includes fuzzy comprehensive method of evaluating network security risk, and entropy weight coefficient method in network security risk evaluation. At last, it points that the application of fuzzy logic in network security evaluation is a new research field and many problems remain to be solved.

Abstract: The paper studies the process of how to encrypt images through Logistic chaotic model, how to use DCT transform to hide the encrytion image in the carrier image and how to restore the images through DCT inverse transformation, analyzes the peak signal-to-noise ratio and realizes the whole process through Matlab.

Abstract: Autogenous volume deformation is an important parameter of anti-cracking behaviors of concrete. The sensitivity analysis of influence of concrete autogenous volume deformation on thermal stress of Xiaowan high arch dam is carried out based on simulation of temperature field. When presuming autogenous volume deformation, expansion concrete and shrinkage concrete are considered. The results show that early expansion and early shrinkage concretes have obvious influence on arch dam’s early thermal st ress; however have less influence on dam center’s maximum thermal stress. The longer of expansion period, the smaller of dam center’s maximum thermal stress; and the final residual thermal stress, which can benefit the concrete’s anti-cracking quality.

Abstract: In view of the situation of shearing the scraper chain frequently and adjusting the pitch chain of the scraper conveyer in the coal mine, the project design a kind of hydraulic security shearing machine for the annulus chain of scraper conveyer, to solve the problem for high strength and heavy gauge annulus underground coal mine to cut off.

Abstract: The vehicle routing problem with stochastic demands is considered in this paper, and an effective tabu search algorithm for the proposed problem. The goal consists of minimizing the vehicle number and expected distance traveled in order to serve all customers’ demands. Finally, a numerical example is given to show the effectiveness of the algorithm.

Abstract: The technology of ground-source heat pump is a revolutionary new technology emerging in the field of central air conditioners for buildings in China. Its application in Hohhot grew continuously in recent years. Based on the demonstration project of general office building of the Development & Reform Commission, Inner Mongolia Autonomous Region, this paper studies the application of ground-source heat pump air conditioning system with supporting heat source in northern cold area, analyzing the energy consumption of system operation, presenting some problems in the operation and solutions thereof, and concluding that the ground-source heat pump air conditioning system is feasible in Hohhot.

Abstract: To improve the efficiency of many-to-one communication, the aggregated signature Rabin signature is proposed. When the several senders sign and send the message to a receiver, they could do the same operation as the common Rabin signature. The several signature texts are aggregated and produced a signal signature text. Instead of verifying the several signature for several times, the verifier only verifies the aggregated signature for one time to determine the validation of the all of the messages. The discussion shows that, by this way the data amount and the computational cost could be reduced nearly 1/2 of the common algorithm. The proposed algorithm has the same secure level as the common Rabin signature.

Abstract: A session key distribution is proposed for secure multicast scheme, which employs decentralized group architecture and accommodates the dynamic group changing efficiently. Compared with the similar schemes, the proposed scheme has advantages with regard to the rekeying cost, the storage overhead and the computation efficiency. It achieves the backward/forward secrecy and has the capacity to provide data confidentiality and integrity.

Abstract: The constrained equations between transition rates and the derivative of open lifetime and shut lifetime distribution for a given state set of Markov Chain are provided. For gating scheme of ion channels with one loop, it is derived by those underlying information that all transition rates can be identified by their open and shut lifetime distributions at state 0 and any other two adjacent states.