Showing papers by "Southwest University published in 2004"

Ultrasensitive potentiometric immunosensor based on SA and OCA techniques for immobilization of HBsAb with colloidal Au and polyvinyl butyral as matrixes.

Abstract: A novel potentiometric immunosensor for detection of hepatitis B surface antigen (HBsAg) has been developed by means of self-assembly (SA) and opposite-charged adsorption (OCA) techniques to immobilize hepatitis B surface antibody (HBsAb) on a platinum electrode. A cleaned platinum electrode was first pretreated in the presence of 10% HNO3 and 2.5% K2CrO4 solution and held at -1.5 V (vs SCE) for 1 min to make it negatively charged and then immersed in a mixing solution containing hepatitis B surface antibody, colloidal gold (Au), and polyvinyl butyral (PVB). Finally, HBsAb was successfully immobilized onto the surface of the negatively charged platinum electrode modified nanosized gold and PVB sol-gel matrixes. The modified procedure was characterized by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The immobilized hepatitis B surface antibody exhibited direct electrochemical behavior toward hepatitis B surface antigen (HBsAg). The performance and factors influencing the performance of the resulting immunosensor were studied in detail. More than 95.7% of the results of the human serum samples obtained by this method were in agreement with those obtained by enzyme-linked immunosorbent assays (ELISAs). The resulting immunosensor exhibited fast potentiometric response ( 6 months).

The Reform Of Social Security System

Abstract: Due to the exterior pressure from accession into WTO,interior tension of increasingly sever unemployment and the pop-ulation of under-privilege causing by transitional economy,the social risks grow to a large extent with each passing day.Howev-er,the existing framework of social security proves fragile to over-come the social problems and therefore,the reform of social se-curity has to center on the structural innovation,namely,strengthening the social relief for the sake of an accelerated.Meanwhile,the transition of social security should integrate the reform of SOE's property rights with that of extensive social in-surance.Besides,state-owned assets can be appropriately real-ized so as to reinforce Pension funds.Social insurance needs to advocate systematic compulsory Supplementary Pension Schemes.

A highly sensitive PVC membrane iodide electrode based on complexes of mercury(II) as neutral carrier

Abstract: A novel solvent polymeric membrane electrode based on bis(1,3,4-thiadiazole) complexes of Hg(II) is described which has excellent selectivity and sensitivity toward iodide ion The electrode, containing 1,4-bis(5-methyl-1,3,4-thiadiazole-2-yl-thio)butanemercury(II) [Hg(II)BMTB(NO3)4], has a Nernstian potentiometric response from 20×10−8 to 20×10−2 mol L−1 with a detection limit of 80×10−9 mol L−1 and a slope of −590±05 mV/decade in 001 mol L−1 phosphate buffer solution (pH 30, 20°C) The selectivity sequence observed is iodide>bromide>thiocyanate>nitrite>nitrate>chloride>perchlorate>acetate>sulfate The selectivity behavior is discussed in terms of the UV–Vis spectrum, and the process of transfer of iodide across the membrane interface is investigated by use of the AC impedance technique The electrode was successfully applied to the determination of iodide in Jialing River and Spring in Jinyun Mountains, with satisfactory results

Blind Channel Equalization for Chaos-Based Communication Systems

Abstract: Side-effects of communication channel seriously impair practical performance of chaos-based communication systems. This paper addresses the issues of blind equalization for chaos-based communication systems. The starting point of this paper is to make use of the Unscented Transform (UT) and the modeling technique for signal, and a blind equalization algorithm is then proposed. It indicates by computer simulation that this algorithm can effectively reduce various distortions and noise in channel. In comparison with the EKF-based algorithm, UT-based algorithm has faster convergence speed and better equalization performance, when channel is with low signal to noise ratio (SNR).

Frequency domain approach to hopf bifurcation for van der pol equation with distributed delay

Abstract: The van der Pol equation with a distributed time delay and a strong kernel is analyzed. Its linear stability is investigated by employing the generalized Nyquist stability and Routh-Hurwitz criteria. Moreover, local asymptotic stability conditions are also derived in the case of the strong kernel. By using the mean time delay as a bifurcation parameter, the model is found to undergo a sequence of Hopf bifurcations. The direction and the stability criteria of the bifurcating periodic solutions are obtained by the graphical Hopf bifurcation theory. Some numerical simulation examples for justifying the theoretical analysis are also given.

The Comprehensive Assessment and Regionalization of Natural Disaster Insurance Risk in China

Abstract: Firstly, natural disaster insurance risk is divided into disaster danger disposition and disaster loss disposition assessment. Natural disaster insurance risk regions are partitioned by provinces, cities and self-governing areas. Geologic disaster, earthquake, flood, typhoon are chosen to be the models for the comprehensive danger disposition assessment. Natural disaster's loss disposition assessment has two levels, the first is economic loss disposition and social loss disposition assessment, the former is judged by the risk region's GDP and capital assert investment, and the latter is depended on the people's density of the risk region; the second level is natural disaster loss disposition assessment which bases on the first one. Then natural disaster insurance risk degree is comprehensively assessed by the natural disaster's comprehensive danger degree and loss degree. At last, every region's natural disaster insurance risk degree can be concluded from the assessed result and then the regionalization map of China is drawn.

Study on vendor-selection based on grey relevant analysis

Abstract: Vendor selection has been one of the critical issues for enterprise's success, and should be solved by scientific and reasonable method. Based on the studies of all kinds of factors, this paper put forward a new set of vendor selection index and a selection model for vendor selection through grey relevance analysis with an example as the illustration.

The Absence of Government's Good Faith and Approach to Remold

Abstract: The government credit is the hard corn and plays a critical role in social credit system It sets a good sample of how to construct and improve the social credit system However, it's not hard to find, in the modern market-oriented economy, that the governments often break their rules and words and induces bad influence on their public images Accordingly, this article demonstrates the necessity of remolding the government credit right now and analyzes the evidence to prove the government which now have deficiency in credit and points out the reason The most above all, the author draws a conclusion about the best choice to remold the image and model of the modern government credit

Martin Bubers,dialogic philosophy and its enlightenment on modern education

Abstract: Martin Bubers' main thought of dialogic philosophy contains world duality and life duality, ontology of relationship, establishment of the sphere of "Betweenness". It embodies three prominent characteristics such as directness, mutuality and approachability. Its profound essence enlightens sharply the modern education, which makes people have a completely new understanding about educational essence, educational aim, educational process and the relationship between teacher and student.

Analyzing on the Effect of Organizational Learning and IT Capability on the Performance of Small and Medium-sized Enterprises

Abstract: This paper, based on brief review of the theoretical research on organizational learning, information technology (IT) capability and operation performance, supposes that IT capability is the intermediate variable between organizational learning and operation performance and puts forward two hypothesizes. Then, by taking 61 small and middle-sized enterprises in Sichuan province as research sample, it expounds and proves these two hypothesizes, so as to analyze the effect of organizational learning and IT capability on the performance of small and middle-sized enterprises.

Robust design for MEMS devices

Abstract: Microelectromechanical Systems (MEMS) offer an emerging and multidisciplinary research area Cost and reliability are essential to the commercialization of MEMS As compared with mechanical machining and IC fabrication, micromachining has the disadvantage of large and intractable dimensional uncertainty, which should be accommodated during design process Robust design improves the robustness of designs in the presence of uncertainty without having to increase manufacturing cost Robust optimization design approaches can be classified into two major categories, namely Taguchi method and tolerance-based method The latter is better suit for constrained optimization Case studies of a micro-accelerometer and a micro-valve are introduced to illustrate the validation of robust optimization design for MEMS devices, where signal-noise ratios are improved significantly

Advances of the application of lignin applied in plastics

Abstract: The paper provides a summarization of advances of the application of lignin in plastics (mainly five aspects including PU, PVC, PF,PP and PE) and makes an analysis into the problems existing and development trends of the technology.

New technology for recording the information based on intramolecular bonds in water

Abstract: A new technology for recording information based on the discreet spectrum of the intramolecular bond energies in water is described. For the latter the existence of a space net of bonded with H-bonds molecules with approximate tetrahedral symmetry is supposed. The discrete character of the water energy spectrum is proved by the measurement of the surface tension variations of evaporating water drops. Using the Shannon's formula, a new term information spectrum of water is introduced, in which the information related to one pair of water molecules as a function of the discrete values of the intramolecular bond energies is represented. The experimental results showing why this information spectrum as a method registered the weak physical and chemical influences on the water are represented.