Applied Mechanics and Materials Vols. 316-317

Abstract: The mathematical model of relation betwteen pitch diameter and stress of the wire has been builded by analysing stress distribution among layers of transmission line, genetic algorithm has been used to optimize the wire pitch diameter ratio. The optimization results show that: when the pitch diameter of the wire be equaled to the upper limit, the contact stress between the layers reaches a minimum. Research findings can provide a certain theoretical basis on the desigen of the wire, antifriction, reduce line losses and an extension of lifetime, it has a higher value in engineering

Abstract: Remote sensing images there are synonyms spectrum and the spectrum of foreign body phenomenon, Traditional classification methods easily lead to the misclassification of surface features and leak points, On the basis of this paper, a decision tree to generate a priori knowledge of the statistical relationship with TM1 to 7 multi-band imaging in the ENVI software support for the data source of the decision tree classification of land cover status quo in Zhengzhou City. Comparative to Remote sensing images of the same area three images at the different time, Studies have shown that the decision tree method is simple, intuitive, and overall classification accuracy of 90.65%.

Abstract: On the basis of analysis of the development of urbanization and land use change in Zhengzhou City in2004-2010, The drive mechanism of the intensity of land use change in the research context of rapid urbanization, To explore the degree of land use change human driving factors, Drive and build a model, The results show that: Unit of agricultural land and the ratio of the output value of the land for construction as well as population density and land use intensity positive correlation, Making land use intensity tends to increase, The population density growth, Urbanization of the population and economic non-farm is the main driving factor for the intensity of land use change. And then proceed to the analysis of the spatial pattern of Zhengzhou City, Investigate the level of urbanization and land use / cover the relationship between landscape pattern.

Abstract: A novel kind of hyamine-containing crosslinked β-cyclodextrin resin (β-CD-DEAE) was synthesized. 2-Diethylaminoethyl group (DEAE) was introduced on β-cyclodextrin by the reaction of 2-diethylaminoethyl chloride hydrochloride with β-cyclodextrin under basic condition and then the crosslinked resin was formed by the crosslink reaction using epichlorohydrin. The quaternary ammonium group was produced by the quaterisation of DEAE using epichlorohydrin. The new crosslinked cyclodextrin resin was characterized by scanning electron microscopy, Kjeldahl method and infrared spectroscopy. The content of nitrogen approaches approximately 5.55%. Meanwhile, the phenol adsorption property for wastewater treatment has been determined. It was found that the hyamine-containing crosslinked β-CD has a strong capability of phenol adsorption. Under the optimal pH of 9, the adsorbent dosage was 30mg/ml. If the initial phenol concentration was 100mg/l, the maximum phenol adsorption efficiency was 84.42%. In addition, the effective recycling efficiency of the new crosslinked β-CD resin was almost 100%.

Abstract: To examine possible effects of soil water conditions in summer in Chongqing section of Jialing River Basin on mulberry trees, we grew potted mulberry in a greenhouse under three soil water regimes designed to simulate normal irrigation (CK), moderate drought stress (T1) and extraordinary drought stress (T2). The results showed the following. 1) With drought stress increasing, the heights, base diameters and root biomass all decreased significantly. The root/shoot ratio, specific root area and root activity of mulberry on the whole showed an increasing trend as drought stress increasing. The leaf water potential of mulberry after drought stress on the whole decreased significantly compared with CK; 2)With the elongation of treatment time, the heights, base diameters root biomass and root/shoot ratios of mulberry in the three treatment groups still increased to different degrees. The root activity of mulberry in each treatment group first increased and then decreased basically, but still maintained a higher level compared with CK, moreover, the leaf water potential of mulberry also decreased gradually on the whole. We concluded that under drought stress conditions the growth of mulberry will be inhibited in a way, but the plant can actively improve its absorption ability by some ways, thereby maintaining its normal physiological metabolism, accordingly demonstrating strong drought resistance.

Abstract: A novel wet process has been developed to simultaneously remove NO, SO₂ and Hg⁰ from flue gas. According to the conditions of the bubbling reactor, diperiodatocuprate (Ⅲ) coordination ion solution was prepared with CuSO₄•5H₂O, KIO₄, K₂S₂O₈, and KOH, and the effects of the various influencing factors, such as diperiodatocuprate (Ⅲ) coordination ion solution concentration, reaction temperature, solution pH on removal efficiencies were investigated. The removal efficiencies of 98% for SO₂, 90% for Hg⁰ and 56.8% for NO were obtained, respectively, under the optimal experimental conditions, in which diperiodatocuprate (Ⅲ) coordination ion solution concentration was 6 mmol /L, the reaction temperature was 323 K, and the solution pH was 9.0. That [Cu(OH)₂(H₃IO₆)]^- was the main existing form of the absorbent at the optimal experimental conditions was confirmed by calculating the concentration ratios of IO₄^- and its dissociation products / [IO₄^-]_ex under different pH, and thereby simultaneous removal mechanism for SO₂, NO and Hg⁰ was proposed.

Abstract: This paper took Fuzhou urban area as an example，which is provincial capital city of Fujian province. Data on the variation of construction land in Fuzhou were obtained by employing the statistic and analytic function of GIS on the spatial data from remote sensing image data in different periods. A new method based on the principle of convex hull was used in this paper, which is to define the types of urban land expansion by the proportion of the area located inside or outside the convex hull of a city’s outline. The results showed that, during the last 20 years，the area of construction land had almost doubled, from 84.1 km2 to 190.3 km2. Urban construction land expanded to 64.2 km2 with an average annual growth rate of 4.84%, which was more obvious during the 1988-2000 periods. On the whole, urban construction land expansion of Fuzhou city belonged to the ‘extension’ type, complementary to ‘infilling’ type. There are three patterns namely 1inear development, sprawl expansion and leapfrog expansion. Previous period, the city spread along two main traffic quickly in the north-south and east-west, latter period was the slow expansion of low-density infill.

Abstract: Stable carbon and nitrogen compositions (δ13C, δ15N) of sedimentary organic matter were determined in the tidal flat of northern Yellow sea. The results showed that stable carbon and nitrogen isotopes compositions of the sediment samples ranged from −24.669～−19.457‰ and 2.125～7.043‰, respectively. The highest value was in St.DLD, and the lowest was in St.Z. Similar δ13C values were observed in St.H (−21.996±0.651‰) and St.P (−22.021±0.187‰), and similar δ15N values were between St.DLJ (5.502±0.223‰) and St.P (5.310±0.294‰). The δ13C and δ15N values did not show any significant regularity. The δ13C and δ15N signatures showed some fluctuation, no obvious regularity. The major source of terrestrial organic matter was from the emissions of river and human pollutant.

Abstract: In December 2011,April 2012 and September 2012, the surface water of the Fenghe River and its tributaries were collected.The temporal variation characteristics of concentration of nitrate nitrogen (NO₃ ^-- N), ammonium nitrogen (NH₄ ⁺ - N), and total nitrogen (TN) in the water were studied. Combined with basin characteristics such as land use and precipitation, causes were analyzed. The results showed that NO₃^-- N content in water gradually increased along the direction of flow spatially, which was closely related to the spatial distribution of land use and pollution sources distribution. In dry period and flood period, the NO₃^-- N content in water was less than that in usual discharge period. NO3^-- N content t in April,2012 reflected the nitrate nitrogen pollution characteristics in storm period. Fenghe River and its tributaries, from source to import into the Weihe River, the concentration of ammonium salt little changed, and at the most sample sites the ammonium salt concentration were not more than 1 mg/L. NO₃ ^-- N is drainage nitrogen main stable form in Fenghe River. TN content in Fenghe River system was obviously higher than that of the vclass of the surface water environment quality standard.

Abstract: According to the environmental survey in coastal areas of Leizhou Peninsula in July 2010, the content and the spatial distribution of five days biochemical oxygen demand (BOD5) were studied. The ratio of BOD5/TOC was applied to evaluate the biodegradability of seawater. The BOD5 in surface seawater ranged from 0.75 mg/L to 4.66 mg/L, with an average of 1.97 mg/L, however, in bottom seawater, the BOD5 varied from 0.09 mg/L to 6.22 mg/L, with an average of 2.16 mg/L. The BOD5 was in line with the second grade of national seawater quality standard of China at most stations. The BOD5 in coastal areas of west Guangdong was significantly different from that of Qiongzhou straits and Beibu Gulf (p<0.01), the highest BOD5 was revealed in the west Guangdong, followed by in Qiongzhou straits and in Beibu Gulf. The biodegradability in bottom seawater was better than that in surface.