Applied Mechanics and Materials Vols. 644-650

Abstract: According to the the characteristic of tower structure and manufacturing property, the tower components are divided into the purchased (C_P), the cooperative (C_S), the inherit (C_L), the key (C_K) and so on. In order to ensure the product data integrity, consistency and correctness in chemical tower, different processing rules are adopted to C_P, C_S, C_L, C_K in mapping from EBOM(Engineering BOM) to PBOM(Proeess planning BOM). Based on EBOM view in UG, the mapping function from EBOM to PBOM is established to process all BOM data. PBOM view is created accordingly, to achieve computer aided design on BOM in the data management for chemical tower.

Abstract: The sediment in intensive culture pond is overloaded by substantial unused nutrients and is conventionally discharged into adjacent coastal areas, which is detrimental to environment. This paper produced a preliminary quality control experiment to mitigate pollution of culture sediment by immobilized Bacillus sp. HSW cells on the composite carrier of sodium alginate and artificial zeolite. Glucose and calcium peroxide respectively were used to improve the sediment conditions of C/N ratio and oxygen level. The sediment quality was monitored periodically for 30 days. The results showed that biocontrol by immobilized Bacillus sp. HSW cells alone would be infeasible. However, the immobilized cells would better perform under controlled conditions. The significant decreases for total nitrogen (TN), total ammonia nitrogen (TAN), and organic nitrogen (ON) were observed at 71%, 91% and 64%, respectively. The phosphorus precipitated as phosphate raised approximately 120 mg/kg, and 60% of organic phosphorus was removed in 30 days. Moreover, the total bacteria abundance presented an obvious increase for over an order of magnitude, which was positive relationship (p < 0.01) to the removal rates of ON and OP. Therefore, the immobilized cells accompanied by environmental manipulation are promising for biocontrol of culture sediment.

Abstract: This paper analyzed two different types of nuclear fuel cycle which refferred to one-through fuel cycle and close fuel cycle (uranium-plutonium fuel cycle). Based on specific economic elements related to each cycle process, this paper built a model to evaluate PWR nuclear fuel cycle’s economy. Then, for given data of PWR, empirical analysis and sensitivity analysis were carried out. The result showed the superiority of the close fuel cycle compared to the one-through cycle.

Abstract: In this study, the dirt adhered on the tubes of different materials (copper alloy tube, stainless steel pipe, polyethylene-aluminum composite pipe) were studied by the scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, PCR amplification, DGGE electrophoresis analyzers. Experimental results show that the microorganism in dirt on the copper alloy tube is mainly shuttle-type bacteria, and the distribution is dense. Stainless steel pipe’s dirt colony is assembling with long bacilli and cocci, polyethylene-aluminum composite pipe’s dirt is the large bacilli and density cocci. Three kinds of dirt in the pipe contains inorganic crystals with SiO₂ and CaCO_3, and the same type of element, but the content is differences, polyethylene-aluminum composite pipe have greater richness of microbial species, a copper alloy tube’s dirt is of little microorganisms.

Abstract: 119vegetable samples were collected from Jiutai County vegetable production base, and Pb concentrations were measured using graphite furnace atomic absorption spectrophotometer (GF-AAS). Results showed that the average Pb of vegetable was 0.05 mg·kg^-1 fresh weight, with only 1.5% above the Safety Requirements. Single-factor contaminant index was utilized for assessment. It was found that vegetable Pb order as following: leaf vegetables>fruit vegetables, dark vegetables>light vegetables. The average daily intake (DI) Pb of per standard person was urban 18.6 ug•d^-1 and rural 16.7 ug•d^-1, as well as economical family 19.1 ug•d^-1and poor16.3 ug•d^-1, indicating that vegetable Pb in Jiutai County were safety. The Pb health risk was assessed based on the target hazard quotients (THQ). The study showed that THQ_urban =THQ_high >THQ_medium >THQ_low =THQ_rural, indicating the health risk via vegetable consumption in rural was relative lower than that in unban area. Assessment results proved that the vegetables Pb in this area is no health risk to persons.

Abstract: Fuel cell operation with a dead-ended systems anode reduces fuel cell system cost, weight, and volume because the anode external humidification and recirculation hardware can be eliminated. However, water accumulation is one of the key factors which influence the stability of its performance. Generally, the anode flooding of PEMFC with anodic dead-end operating mode can be avoided by using periodic purge process. But such an operating method can lower the utilization efficiency of hydrogen because small amount of hydrogen is expelled out of fuel cell and wasted. In order to improve the utilization efficiency of hydrogen, the pulsating technique at anode has been proposed. In this paper, the investigation of the hydrogen pulsation effects for PEMFC stack has been made, with only continuous hydrogen supply, with between continuous hydrogen and pulsation hydrogen at different positions, such as the inlet or outlet of anode. The results shows that the performance of a PEMFC stack has been improved significantly when the pulsation hydrogen flow introduced from the outlet at anode.

Abstract: Protein extraction from Gualou seeds were studied, and Kjeldahl method and Sodium dodecyl sulfonate-polyacrylamide gelelectrophoresis (SDS-PAGE) were used to characterize the properties of extracted proteins. The optimum extraction parameters were as follows: the extraction solution was 0.2 mol/L phosphate buffer (pH, 8.0) with 5% NaCl, and the ratio of solid to liquid was 1:10. A protein yield of 75.01% was obtained under the optimal extraction conditions. The SDS-PAGE analysis showed that the proteins extracted from Gualou seeds have apparent molecular weights varying from 10 to 30 kDa, mainly close to 30 kDa.

Abstract: This study aimed to pursue the correlation between essential/nonessential gene and protein subcellular localization. The protein sequences of the essential/nonessential genes of 28 prokaryotes in Database of Essential Genes were analyzed by PSORTb3.0. Results show that proteins of essential genes locate in cytoplasm with relatively high percentage, i.e., in the range of 40% to 55%. Percentages of the proteins of essential genes locate in cytoplasma membrane are lower than that of nonessential genes, which mostly are about 15%. However, the values of proteins of nonessential genes are mostly about 20%, and that of Gram-positive bacteria are close to 30%. The distributions of protein subcellular localization of the essential/nonessential genes are different evidently. This could be used for classification of essential and nonessential genes.

Abstract: Importance of proteins are different to perform functions of cells in living organisms according to the relevant experiment results, and more essential proteins is the most important kind of proteins. There are recently many computational approaches proposed to predict essential proteins in network level through network topologies combined with biological information of proteins. However it is still hard to identify them because of limitations of topological centralities and bioinformatic sources. And more it is the challenge is to perform better with less resources. Therefore in this paper, we first examine the correlation between common topological centralities and essential proteins and choose a few particular centralities, and then to build a SVM model, names as TC-SVM, for predicting the essential proteins. The new method has been applied to a yeast protein interaction networks, which are obtained from the BioGRID database. The ten folds experimental results show that the performance of predicting essential proteins by TC-SVM is excellent.

Abstract: Recently, room temperature ionic liquids (RTILs) have been widely used in dissolution, homogeneous modification of cellulose. Cellulose only could be dissolved in RTILs at elevated temperature. Herein, effect of dissolution condition on microcrystalline cellulose in 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) ionic liquid was studied. The results indicated that the degree of polymerization (DP) of regenerated cellulose decreased from 161 to 83 with the increasing of dissolution temperature in the range of 70 °C to 110 °C, whereas the DP was affected by dissolution time slightly. Moreover, after dissolution [Bmim]Cl could be recycled by distillation and vacuum drying. The recycled [Bmim]Cl also had good dissolving capability of cellulose, and its FTIR spectra was similar to that of original [Bmim]Cl.