Advanced Materials Research Vols. 217-218

Abstract: An arbitrarily oriented anti-plane crack with its tip at the physical weak-discontinuous line of the structure which is made up of homogeneous material and functionally graded materials (FGMs) is studied. The analytic solution of the higher order crack tip fields (similar to the Williams’ solution of homogenous material) is obtained by applying the asymptotic series expansion. When non-homogeneous material parameters are degenerated, the solutions become the same as the asymptotic crack tip fields of the homogeneous material. Therefore, the solutions are the basic results of non-homogeneous fracture mechanics, and provide a theoretical basis for solving the fracture problems of one common structure with physical weak-discontinuity.

Abstract: The higher order discontinuous asymptotic fields which are similar to the Williams’ solutions of homogenous material are obtained by the displacement method and asymptotic analysis for a plane crack at the physical weak-discontinuous interface in non-homogeneous materials. The results provide a theoretical basis for the numerical analysis, experimental investigation and the engineering application of physical weak-discontinuous fracture.

Abstract: For homogeneous material plates and non-homogeneous material plates, the crack-tip field plays an important role in the research of fracture mechanics. However, the governing equations become the system of the sixth order partial differential ones with the variable coefficients when the material gradient is perpendicular to the thickness direction of plates. In this paper, they are derived first. Then, the crack-tip fields of the plates of radial functionally graded materials (FGMs) are studied and the higher order crack-tip fields are obtained based on the Reissner’s plate theory. The results show the effect of the non-homogeneity on the crack-tip fields explicitly and become the same as solutions of the homogeneous material plates as the non-homogeneous parameter approaches zero.

Abstract: This paper introduced the characteristics of functions of the automatic monitoring system on surveys robot (TCA total station ). Has analyzed the application situation and the precision of the automatic monitoring system. Practical applications indicated that this system had high efficiency and precise data transmission. The achievement of surveys achieved very high precision in both horizon talplane and vertical direction. The results can provide technology references for similarprojects.

Abstract: This system was composed of independently developed ECG Signal Acquisition Model, DAQ Signal Acquisition Card, and the LabVIEW Graphics System. Regarding the ECG Signal Acquisition Model, this system uses the TL082 Operational Amplifier to realize the amplification, and uses the Filter Circuits along with the ISO122 to isolate IC. Regarding the ECG oscillogram display and ECG Signal Acquisition, the LabVIEW Graphics System developed by the American company “National Instruments” (NI) was adopted. Also, the LabVIEW system and the DAQ signal acquisition card of the Data Acquisition Package developed by the NI Company was adopted as well.The DAQ signal acquisition card can engage in A/D, DI/O, number counting and time counting applications. At last, it can use the TCP/IP Protocol to send the ECG waveform data by the internet to the computers with remote surveillance monitors. The remote surveillance computers can be installed in the hospital. Professional doctors in the hospital can observe the patient’s ECG waveform data and statistics, and engage in the job of remote care.

Abstract: Ti6Al4V powders were produced by Argon gas atomization, the powder fraction ＜ 250μm was hot isostatically pressed (HIP) at 920°C and 140MPa. The properties of pre-alloyed powders and the compact were investigated in this paper. Powder particles are almost perfectly spherical. The microstructure of powder surface is approximate hexagonal cellular structure, the inner structure exhibits cellular αphase and needle-like martensiteα′ phase, these are resulting from the rapid solidification. After HIP, Ti6Al4V alloy has a Widmanstaten microstructure consisting of continuous grain boundary α（GBα）phase and β transformation structure, the grain size of GBα phase is in the range of 5～15μm . The tensile test at room temperature shows that strength of samples is 880MPa, the fracture surface exhibits obvious brittle cleavage fracture features including cleavage facets with river pattern and a few elongate dimples of different sizes and big voids at localized area.

Abstract: By analysis on the Internet Of Things (IOT), logistic unified information system as well as Intelligent Flexible Architecture technology of system and business flow, provides a intelligent flexible reform technology and realization method. Intelligent flexible reform technology of logistic unified information system is a solution for logistic system and business flow combining IOT RFID（Radio Frequency Identification）,Internet and CTI (Computer Telecommunication Integration), it uses business-aspect adjustment algorithm to form the flexible reform model of the system, and do the reform planning coordinating handling, realize the real time reform with IOT logistic business flow on conditions of unified information communication. Through business-aspect adjustment testing algorithm, it proves that the intelligent flexible reform technology of logistic unified information system based on IOT is feasible.

Abstract: Through the analysis on internet of things (IOT) technology, logistic information system and information perception technology, according to the requirements of modern logistic information technology and information status perception development in environment of internet of things, suggest the solution for building logistic system information perception model in the environment of internet of things. The logistic system information perception model is a combinational application of RFID （Radio Frequency Identification）, internet technology and telecom technology, to build a three layer system structure of physical layer, network layer and information perception, by KBI (Key Business Index) to connect precaution affairs for each monitoring object during the logistic business flow, represent the business status by evaluation according to the regulations, establish an information perception model integrated with four cycles of information collection, event normalization, correlation analysis of information as well as warning & processing, and by evaluation method of periodicity factor for logistic information perception to quantitively evaluate on each information perception model. By example of calculation of evaluation model for periodicity factor, the logistic system information perception model in the environment of internet of things proves to be feasible.

Abstract: Internet of Things (IOT) is an extension and expansion of the internet development. The ultimate goal of IOT system is to realize the exchange and communication between human and thing as well as thing to thing. With the constant development of IOT, the intellectual degree of the future IOT would be higher and higher, the application filed would be getting extensive too. IOT plays a very important promoting effect on the logistic service system, corporation production and operation management, the production quality control of the online shopping by consumers and other aspects of the electronic commerce. IOT E-commerce provides extreme convenience to people’s work and life, but its information safety still has some restriction. The character of Analytic Hierarchy Process (AHP) is to divide the complicated problem into simple combinations of multiple hierarchies and factors, and group each factor in two for comparison and calculation, according to the calculated result to make judgment and make choice. This article, based on AHP model, establishes information security evaluation model of IOT electronic commerce, evaluates on the five physical measures to protect electronic label by theory analysis on algorithm and AHP model, which has certain referential value to the IOT E-commerce information security evaluation work.

Abstract: Industrial naphthalene is the main material for the polynaphthalene sulphonate production, domestic industrial naphthalene supply is unable to meet increasing demand of the market, and has to be always relying on imports, the price is greatly impacted by overseas market price change, for recent years, industrial naphthalene price has been increasing all the time, therefore how to reduce the consumption of industrial naphthalene has be a current scientific and production subject. This project is based on the normal production process, given the key problems of low sulphonation level, poor polymerization of polycondensate and quick slump loss of polynaphthalene sulphonate during the polynaphthalene sulphonate production, provides some specific research and improvement and which proves to be satisfactory.