Search

As the tunnel project has the characteristics of concealment, complexity, uncertainty and the larger investment risk, whose insidious danger is outstanding especially in the construction process. It is important for the safety of the construction process to determine the potential risk and minimize the risk using reasonable methods. Based on the experts investigation, 3-hierarchy and eighteen factors’ evaluation index system of risk assessment is established through the improved analytic hierarchy process. The results show that this method is reasonable and can greatly reduce graded difficulties.

Rare earth metal complexes have special characteristics, such as extremely narrow emission bands and high internal quantum efficiencies, which are suitable to be used as the emission materials, chemistry and biological technology. Ternary nano complex of terbium gatifloxacin phenanthroline was synthesized.The composition and structure of ternary complex were characterized by element analysis, Mass Spectrometry (MS), UltraViolet Absorption Spectrometry (UV) and fluorescence spectra(FS). The influences of solubility, thermal stability and luminescent properties of complex as well as addition of phenanthroline secondary ligands on the fluorescence spectra of the ternary complexes were studied. The results of fluorescence spectra analysis showed that partial energy was transferred from Characterization to terbium ions by intramolecular energy transfer processes, meanwhile, the addition of phenanthroline can effectively increase the luminescence intensity of terbium icons. The complex possessed well luminescence and showed characteristic emission peaks of Tb3+ under UV light excitation and emitted strong green fluorescence. Moreover, in an ITO/PVK/Tb(GFLX)3Phen/Al device, Tb3+ ion can be excited by intramolecular ligand-to-metal energy transfer process. The main peak of emission at 545 nm is attributed to 5D0→7F2 transition of the Tb3+ ion, and this process results in the enhancing green emission. Biological actrivity properties of the rare earth complex was well studied.

This paper conducted investigation and evaluation of light pollution status quo in Macau applying a research method combining qualitative and quantitative analysis. Obtaining general information of city light environment and ensuring main source of light pollution via questionnaire, the research selected different types of city areas and nightscape light source, measured and assessed ambient light and nightscape illuminating brightness degree respectively, referring to relevant domestic and overseas specification and guidelines. The research aims to explore a investigation and evaluation method of city light pollution at night. Its results can provide reference to city light pollution assessment and management.

How to assist decision making efficiently using information technologies such as GIS and water environment models has become a hot issue in the field of emergency study. Starting from the actual need of water pollution accident emergency handling, this paper uses scenario analysis, organically couples GIS, water environment accident models and decision making methods, and establishes an intelligent decision making system for emergent water pollution events. Then, with the actual data from Beijiang River cadmium pollution event entered into this system, it analyses and compares the change of pollution situations in different scenarios, and verifies the effects of the study. Finally, it provides a technical summary and prospect.

In this paper, a new pH/temperature sensitive beads with core-shelled structure, composed of sodium alginate and poly(N-acryloylglycinate), were prepared using as drug delivery carrier. Selecting indomethacin as a model drug, in vitro drug release behaviors were investigated at different temperatures, phosphate buffer solutions (PBS) and polymer content. At pH=2.1, the release amount of indomethacin loaded in the beads was only 2.46% while this value approached to 95.23% in pH=7.4 PBS. In addition, the release rate of indomethacin at 37°C is much higher than at 18°C.

In this paper, a new pH/temperature sensitive hydrogel bead (HME) with core-shelled structure as a drug delivery system was prepared using N-acryloylglycinate and sodium alginate. In caffeine release studies, the effect of different pH value, temperature and the polymer content were evaluated, respectively. The results showed that 62.2% drug was released from the sensitive beads in pH 2.1 within 300 min, whereas 99.3% drug diffused into the medium in pH 7.4 at 37°C. The significantly higher release was observed at higher temperature than at lower temperature. In addition the release amount of drug was decreased with increasing polymer content. The release behaviors of caffeine suggested a feasibility of the beads as pH/thermo-controlled drug release carrier.

In this study, a pH/temperature sensitive polymeric hydrogel from poly(N-acryloylglycine) and natural chitosan (PNAG-CS) was prepared via the radical polymerization. The effects of temperature and pH on the swelling behavior of PNAG-CS were systematically studied. Using caffeine as the model drug, the controlled caffeine-release from the resulting pH/temperature sensitive PNAG-CS was evaluated as functions of pH, polymer content and temperature by UV spectrophotometer.