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The new arms form of radial gate—dendritic arms is introduced for the proper mechanical mechanism, however the stability design is very difficult. According to the stability theory of structure, the stability analysis model of step column with lateral restraints was proposed for dendritic arms, some equations was derived from the principle of minimum potential energy, the practical formulas of buckling bearing capacity and effective length coefficient were provided. According to an example, the accuracy on formulas was verified by finite analysis method.

There were 48 sea water samples collected from Bohai Bay (China) in autumn, 2013. In surface water the heavy metal content from high to low was Cu, Zn, Cr, As, Pb, Cd, Hg, as Zn, Cu, Cr, As, Pb, Cd, Hg in bottom water. Cr and As were up to the first class value of the seawater quality standard except Zn and Cu.

The diversity of macroinvertebrate in Sha River and Xiangshui River of Dongjiang (China) were investigated in June 2013. According to the index of biological diversity and integrity, the water quality was evaluated. It provided a reference for water pollution controlling and water resources protection.

Based on the environmental survey data in off-shore of Qin Huangdao from May to June 2011,correlation analysis was made between population density of Noctiluca scintillans and environmental factors. The results indicates that population density of Noctiluca scintillans does not exist linear correlation with nitrite, nitrate, ammonia, nitrogen, phosphate,dissolved oxygen and PH ,it is positive correlation with temperature and silicate noctiluca and negatively correlation with transparency and salinity.

To determine the effects of dietary selenium (Se) supplementary on muscle superoxide dismutase (SOD) activity, oriental river prawn, Macrobrachium nipponense were exposed to three commonly used pesticides - cypermethrin. For each concentration of each pesticide, the shrimps were grouped into control diet group, inorganic Se group and organic Se group. For each concentration of each pesticide, the order of total SOD activities were organic Se diet group > inorganic Se diet group > control diet group. With the increasing concentrations of pesticides, the total SOD activities increased first and then decreased dramatically. This study indicated that Se supplementary in diet could enhance the resistance of shrimps against low concentrations of ambient contaminants.

To evaluate water quality, an investigation of phytoplankton community was conducted in Taizi River of Liaoyang Area, June 2011. The results showed that 130 species of phytoplankton belong to 6 phyla and 63 genera existed. Chlorphyta has the richest species of algae, which accounted for 43.85% of the total number, followed by Bacillariophyta (32.41%). Water quality in upstream is better than downstream. Species and biomass of Cyanophyta and Euglenophyta which have tolerance of pollution increasing According to the integrative analysis result of Shannon-Wiener diversity index, Pielou Evenness index and Margalef Species diversity index, Taizi river is judged belong to low-polluted or oligo- polluted，but some sites belong to β -moderate polluted, effective managements should be taken in order to control the water pollution.

The hepatopancreatic cell culture of the kuruma prawn, Litopenaeusvannamei, was conducted to identify the effects of zinc on cell division. The culturesystem consists of medium 199 (M 199) supplemented with 0.060 mol/L NaCl,1.011g/L glucose, 1000 UI/ml penicillin, 1000 μg/ml treptomycin, 20% heatinactivated fetal calf serum (FCS) for primary cells and 10 % for subculture cells. TheRNA/DNA ratio in cultured cells was measured. The results show that the celldivision of cultured hepatopancreas cells in L. vannamei was increased by the optimalconcentration of Zn2+, 80 μg/L.

RFID technology has many advantages and plays an important part in eliminating the inaccuracy of inventory information. This paper analyzed how manufacturers decided the raw material ordering quantity to maximize their profit when the price of raw materials was given through newsvendor model. Combined with the impact of putting raw materials wrongly and lost of raw materials, we compare the profits of not adopting RFID technology and that of adopting it. Then we obtain the biggest cost that manufacturer could undertake when adopting RFID, and the results can provide the foundation for the decision maker of manufacturing enterprise.

The benthos in Taizi water system of Liaohe River were collected in June 2011.Benthiccommunity composition was analyzed, sample points diversity indexes were calculated, waterquality of TaiZi water system was evaluated, and according to the analysis, the main influencefactors of benthic index are pollution and human activities. Corresponding measures should betaken to protect the health of the river and pollution must be controlled. At same time, humaninterference activities should be controlled.

In this paper, we developed a model of supply chain network, in which both physical and B2C electronic transactions were used by manufacturers and the manufacturers’ risk was considered. The model comprised various decision makers including manufacturers, retailers, and consumers. And the demands associated with the consumers were random. We formulated the equilibrium state of the network by finite-dimensional variational inequality theory. In turn, the logarithmic–quadratic proximal prediction–correction algorithm was designed to calculate the network equilibrium pattern. Several numerical examples were given to illustrate the impact of price ceiling, production capacity constraints, and risk upon the network equilibrium prices and product shipments. The results show that when considering a binding price ceiling on competitive markets, the total profit of manufacturers, and the retailers will decrease.

The effects of the manganese (Mn) supplemented diets on the level of superoxide anions (O-2) in the hemolymph, and the activity of superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPX) in the muscle of Neocaridina heteropoda were investigated. Manganese sulfate (MnSO4) was added to a basal diet at 0, 20, 40, 60, 80, or 100 μg/g. Diets were fed to triplicate groups of shrimp (0.30±0.11 g, 1.4±0.1 cm) in a recirculating freshwater rearing system for 30 days. The Mn concentration in the rearing water, monitored during feeding, was 1.00±0.02 μg/l. O-2 was lower and antioxidant enzyme activity was higher (p

The effects of dietary Selenium (Se) supplementation on muscle superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPX) activities and haemolymph superoxide anions ( $$ {\text{O}}_{2}^{ - } $$ ) of Neocaridina heteropoda exposed to ambient nitrite were investigated. The results showed supplementation of Se in diet could enhance the resistance of shrimp to low concentration ambient nitrite. The results demonstrated that Se might have a potentially useful role as an effective antioxidant and resistance to aqueous nitrite in shrimp and the effect of the organic Se was better than that of the inorganic Se.

The effects of a selenium-supplemented diet on the antioxidant enzyme activity of superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPX) in muscles of the shrimp, Neocaridina heteropoda, were investigated. Purified diets with six levels (0, 0.15, 0.30, 0.45, 0.60, and 0.75 μg/g) of supplemental Se were fed to N. heteropoda for three months. CAT and GPX activity was determined after one month and SOD activity was determined every month. The activity of the enzymes was dose dependant; activity of all three enzymes was significantly higher in shrimp fed Se-sup- plemented diets than in those fed the unsupplemented control diet. SOD activity significantly rose and fell during the three months and was higher in the second month than in the first or third. For all three enzymes, antioxi- dant activity reached a maximum when the Se concentration was 0.45 μg/g.