Advanced Materials Research Vols. 850-851

Abstract: s: In this study, to understand the efficiency of lignin deconstruction by fungus-growing termite Macrotermes barneyi which feed on softwood only contained guaiacyl lignin, the wood metabolites in the hindgut of M.barneyi were analyzed using direct pyrolysis-gas chromatography-mass spectrometry. Significant cleavage level of propyl side-chain of phenylpropane in the hindgut was detected, and ring hydroxylation was also observed by the detection of syringal lignin. Compared with the reduction of furfural content, a pyrolysis product of pentose polymers in hemicellulose, reduction of the content of guaiacyl lignin which contained one-carbon side chain was huger in the hindgut, indicating the degradation of depolymered lignin is greater than that of hemicellulose. The analysis of lignin structure in the gut is contributed to understand the mechanism of lignin degradation by fungus-growing termite.

Abstract: Adopting the PCA and AHP methods, this paper builds up the low-carbon economic development evaluation system on four aspects: resource endowments, level of technology, consumption patterns and stages of development, to evaluate the low-carbon economy on subsystem and comprehensive development prospect. Taking Nanchang city for example, the research conclusion shows that the low-carbon economy of Nanchang enjoys a good momentum of development rising, which conforms to the reality and turns out to be practical. In this context, we propose feasibility countermeasures and suggestions for the development of Nanchangs low-carbon economy at the end of this paper.

Abstract: In order to analyze the relationship between urban construction land and economic development, and to know the similarities and differences of the relationship in different province in China, decoupling theory was introduced to analysis the relationship between construction land change and GDP growth. Research showed that, during 2003-2008, spatio-temporal difference was existed in every province in China about decoupling and coupling degree between construction land change and GDP changes. At the same time, there was also the leading type or major change trend. (1) During the 2003-2008, from the national scale, the interaction between construction change and GDP growth varied from weak decoupling state to the weak coupling condition. (2) Decoupling degree between construction change and GDP growth has a little difference in each provincial region in China, which showed majority continuous distribution in space. (3) Decoupling process between construction land and GDP growth may be turn into opposite direction, and the process was tortuous.

Abstract: The sand ridges field in Jiangsu coastal area has been the key region of tidal flat reclamation, waterway regulation and port construction. Adopting the hydrological and sediment data in winter, the tidal patterns were revealed. In addition, the depth-averaged velocity, sediment grain size and sediment concentration in each station were analyzed and compared in detail. The result shows that the tidal in study area is regular semidiurnal and diurnal inequality. The velocity has a decreasing tendency with the Tiaozini water area being centered towards the surrounding areas. The grain size gradually decreases and then increases from north to south, while the sediment concentration gradually increases and then decreases from north to south.

Abstract: By choosing economic carrying capacity of coal resource as an evaluation index and the economic carrying capacity evaluation models, the paper conducts empirical analysis for economic carrying capacity of Chinese coal resources. The results indicate the economic carrying capacity evaluation of coal resource in China is very low and the economic carrying time is a little shorter and China is also in ecological deficit in this period.

Abstract: Diatomite is a kind of non-metallic mineral with many pores, small density, large specific surface area, good adsorptive property, acid resistance, alkali resistance, and insulation. As a new kind of coagulant material, diatomite has characteristics of wide range of resource, good sewage treatment effect, and simple equipment for later sludge treatment, so its application prospect is broad. This paper introduced the basic conception and properties, and adsorption mechanism of diatomite, summarized the modification method of diatomite, its research and application status of water treatment, as well as its future development trends.

Abstract: Garbage incineration is an effective minimization and resource processing methods, but there are no comparative analysises about the environmental impact of incineration processes. To investigate the environmental impacts of three typical MSW incineration processes, we modeled scenarios, calculated energy consumed and six aspects which classified as GWP, ODP, AP, EP, POCP and DUST. The classification results showed the value of the environment impact potential respectively. The impact potential of heat recover-dry absorption processes according to normalized results in descending order is GWP>EP>DUST>AP>POCP>ODP, in contrast the rank of heat recover-wet absorption and semidry processes is GWP>EP>AP>DUST>POCP>ODP, global warming impacts is the most significant penitential factor. The rank of impact potential according to weight factor in descending order is GWP>EP>DUST>AP>ODP>POCP. Dust potential became more significant. The weight factor of Dust is almost twice as much as that of AP. This is because there is a large gap between baseline level and the target level, the solid-waste are the focus of control in these years. In environmental terms, the environmental depletion index of heat recover-dry absorption process is lowest with minimal environmental impact and the heat recover-wet absorption process is the highest with largest environmental impact. The incineration with dry absorption program is the best environment-friendly process in term of environmental impact. Utilization of waste water and reducing total amount of water entering the system can effectively reduce the environmental implication for both HW and HS processes.

Abstract: This paper focuses on the factors affecting the last stage during the polymer flooding the follow-up water drive. The purpose is to sustain the development production and the sweep improvement in oilfield. By applying the STARS module of CMG to establish an ideal model, apply Numerical simulation method to analyze the influence of geological factors on the recovery. The research results show that permeability max-min ratio and connectivity have greater impact on the ultimate recovery.

Abstract: Introduce several examples of surface active agents used in wet-process phosphoric acid (WPPA) to show its effect on the quality of phosphogypsum. Summarized both domestic and foreign methods of comprehensive utilization of phosphogypsum, such as being made into calcium sulfate whisker, building materials, soil improvement agent, chemical raw materials and etc. Some problems of resources utilization of phosphogypsum in China are summarized, and reasonable suggestions are put forward.

Abstract: The fiber sensor based on SPR, surface plasmon resonance, could effectively overcome the shortcomings of the existing measurement methods of oil in waste water, such as outdated detection ways, low measurement accuracy, poor adaptive ability environment, and so on, and it had extensive research and application value. On the basis of analyzing the principle of SPR, the fiber sensor based on SPR was designed and the system structure model was given. The solutions of oil and waste water with different concentrations were tested and the relation between resonant wavelength of SPR spectra and refractive index of the tested solutions were obtained. The experiment results show that it is feasible that the fiber testing technology is used to measure the oil in waste water, and the study has certain significance in sewage disposal for the petrochemical industry and water reuse.