bluuebunny/crossref_metadata_2025 huggingface dataset:
Theoretical Analysis of Longitudinal Ventilation System in a Road Tunnel for Predictive Control Based on Inertia Effect
Authors: Tan Zhen , Huang Zhi Yi , Wu Ke , Xu Lei Ting
Published: March 2013

Speed control of longitudinal ventilation systems in road tunnels is being combined with typical model predictive control (MPC) strategies which may bring huge energy saving potential to the system. Theoretical analysis of the inertia effect is presented based on the energy equation of one dimensional incompressible unsteady flow, step response model is chosen to describe the dynamic behaviors of the system. The results show that the effect of jet speed change on CO concentration is nonlinear within fan’s economical working range and the settling time of CO level has similar change trend with that of the flow field but is a little longer. The system settling time is longer when jet speed decreases than it increases and is related to the change extent of jet speed. The effect of traffic intensity on CO concentration can be regarded as linear disturbance to the system output. These results may provide useful indexes to control the tunnel ventilation system more economically and lay foundation for the application of predictive control strategy in the system.
Experimental Investigation of Seismic Behavior of a New Type Masonry Walls
Authors: Chen Wei , Wu Fang Bo , Zhou Xu Hong , Huang Hai Lin
Published: March 2013

Conventional concrete hollow blocks have vertical single or multiple holes and they have been extensively used in masonry structures and as infill walls in reinforced concrete frame structures. However, most masonry walls using conventional concrete hollow blocks have the shortcoming of poor seismic resistance. A new type concrete hollow block with horizontal-holes has been developed and it could significantly improve the seismic resistance of a masonry wall as well as simplify the construction processes. The new hollow blocks are very easy to build a wall in a construction site and, in particular, they enable a convenient construction of reinforced concrete (RC) horizontal strips in their horizontal cavities and such RC strips can be readily connected to the adjacent RC columns. This provides an innovative seismic resistant measure to enhance the seismic resistance of masonry walls. In order to evaluate the seismic behavior of the new type masonry walls, an experimental investigation was carried out and seven full scale wall specimens were tested under in-plane cyclic loading. The experimental parameters include the number of horizontal RC strips, strength of the hollow blocks, height/width ratio of a wall and, with or without a window opening in the wall. In this paper, the details of the experimental investigation and the main test results are presented and, the characteristics of the seismic behavior of these wall specimens are discussed in relation to the influence of the experimental parameters.
Analysis of Axial Bearing Capacity of Concrete-Filled Steel Tube Hollow Columns
Authors: Luo Xiao Yan , Liu Wei Ping
Published: March 2013

Based on the triple shear unified yield criterion, the mechanical behavior of the concrete-filled steel tube columns was analyzed. The calculation formulas of axial bearing capacity of the concrete-filled steel tube columns were deduced with considerations of the restriction effects of steel tube and the effects of the intermediate principal stressed. The results show that the intermediate principal stress effect parameter b has influences on the ultimate bearing capacity. With the increase of the intermediate principal stress effect parameter b, the ultimate bearing capacity of the concrete-filled steel tube columns increases too. The results show that formula deduced in the paper has good applicability and the solution has an important practical value.
Analysis of Regression for Strength Index of Concrete Performed Brick Masonry
Authors: Wang Qi Fang
Published: March 2013

Based on the data of the strength tests of concrete performed brick masonry，the basic strength formulas of concrete performed brick masonry are obtained. Through regressive analysis, it will be coherent to the compressive strength of concrete performed brick masonry to introduce the adjustment coefficient of mortar contrast to the Code for Design of Masonry Structures of China. The shear strength, bending strength along straight joint and bending strength along straight joint are uniform with the Code for Design of Masonry Structures of China.
Shear Resistant Behavior of RC Columns Subjected to Axial Pulse-Like Ground Motions
Authors: Zhao Wei Feng , Hu Xiao Quan , Chen Qin
Published: March 2013

The shear-resistant behavior of reinforced concrete (RC) columns subjected to axial velocity pulse-like ground motions was studied. Single RC columns with the constant vertical and horizontal fundamental period were used to investigate the influences of fault-distance of earthquake records, vertical to horizontal acceleration spectral ratio of earthquake records, initial axial load ratio and shear span ratio of RC column, on the shear-resistant behavior of RC columns. a suite of 18 strong ground motion records from Chi-chi earthquake divided into three fault-distance groups were taken as excitations to execute nonlinear dynamic time history analysis. The results demonstrated that axial velocity pulse-like earthquake action (fault-distance) had signiﬁcant influences on the shear resistant-resistant of RC columns. Shear-resistant behavior (shear capacity/shear demand) increases with the increasing of fault-distance. Fault-distance and shear span ratio had a certain coupling influences on the shear-resistant behavior of RC columns.
Analysis on Dynamic Failure Behaviors of Steel Double-Layer Grids Supported by Tridimensional Truss Columns Used in a Gymnasium with the Function of Earthquake Victims Shelter under Disaster Earthquake
Authors: Zhang Jian Yuan , Li Hai Wang , Liu Jing , Zhang Xun
Published: March 2013

In this paper, the elasto-plastic dynamic analysis on dynamic failure behaviors of steel double-layer grids supported by tridimensional truss columns used in a gymnasium with the function of earthquake victims shelter under disaster earthquake is carried out under EL-centro wave with SAP2000, and the appraisal results on their anti-failure performances are presented under strong earthquake action based on the plastic-hinge theory. In the analyses, the geometric and material nonlinear effects are considered simultaneously based on the plastic-hinge theory. The plastic development level of the rod, the deformed shape and the failure type and the ductility are estimated by plastic hinge principle. The results show that the failure model of the structure under the earthquake wave action is the complicated combination of strength failure and elasto-plastic dynamic local buckling in deferent areas of the structure; When the structure reached its failure critical limit, the development of the plastic hinges is not sufficient and only 9.99% of the rods enter into their plastic stage; The ratio of its maximal failure node vertical displacement and its short span is 1/331, which can meet the need for flexible non-structural attachment; The ratio of its maximal failure node horizontal displacement and its columns is 1/166; Its critical failure peak acceleration of EL earthquake wave when applied in the combination of three directions is 602gal, which is 1.5 times more than the official seismic fortification level of 8 degree (major earthquake, 0.2g) and can be served as earthquake victims shelter in the area of 8 degree seismic fortification; Its displacement ductility coefficient is 5.65,which shows the structure owns good energy dissipation capacity.
Liquefaction Potential of Clayey Soils from Wenchuan Earthquake-Induced Landslides
Authors: Chen Chuan Sheng , Xiao Hong Bin
Published: March 2013

It is commonly considered that liquefaction of sandy soils is the important reason for earthquake-induced landslides,but it has been reported liquefaction phenomenon can also occur in clayey soils in the recent research. In order to clarify liquefaction potential in clayey soils ,a deeper study was conducted on the basis of field investigation and a series of laboratory tests including undrained cyclic ring-shear tests on the clayey soil samples collected from the sliding zone of the Wenchuan earthquake-induced landslides. Results show that the liquefaction potential of clayey soils is lower than that of sandy soils given the same void ratio; the soil resistance to liquefaction rises with an increase in plasticity for clayey soils; It is useful to estimate the liquefaction potential of soil by means of plasticity index and the liquefaction potential of soil in practical engineering applications.
Evaluation of Strong Column Factors for RC Frames Based on Seismic Vulnerability Analysis
Authors: Wang Hui Ying , Cai Jian , Bu Guo Bin
Published: March 2013

Augmenting the flexural strength of columns in the seismic design of reinforced concrete (RC) moment resisting frames is a key measure among all the detailing procedures of seismic capacity design, which induces the desirable beam side-sway mechanism for the structure to dissipate energy during a strong earthquake. The objective of this paper is to assess the influence of various strong column factors which is employed to perform seismic vulnerability analysis to the seismic performance of a six-story deterministic RC frame structure. Seismic vulnerability analyses indicate that augmenting the flexural strength of columns is an effective measure to improve seismic performance of RC frame structures. Increasing strong column factor improves the displacement capacity of structure and induces the biggish grads between the different damage limit states, which provide caution to prevent the abrupt collapse of structure during a strong earthquake. Seismic vulnerability curves provide the quantitative criterion for evaluating the seismic performance of structure and choosing appropriate target strong column factor.
Seismic Response Analysis of Reinforced Concrete Frame Structures Considering the Variation of Parameters
Authors: Wu Qiao Yun , Zhu Hong Ping
Published: March 2013

The orthogonal polynomial expansion method expression of stochastic structure was deduced. Then, based on orthogonal polynomial expansion method, taking a 20-storey reinforced concrete frame structure as an example, the impact of the randomness of structural parameters on time history response was researched. Meanwhile, in order to verify the correctness of analysis program, the calculation results of orthogonal polynomial expansion method were compared with the Monte-Carlo method which based on Newmark integral. The results show that it can get relatively accurate results when the number of terms of the orthogonal polynomial is 5. Structural mass and stiffness have a greater impact on the structural dynamic response. And the greater number of random parameters, the greater the impact on structural dynamic response.
Static Properties of Silty Soil Subjected to Repeated Freezing and Thawing
Authors: Yan Han , Liu Jian Kun , Wang Tian Liang
Published: March 2013

In order to deeply comprehend the static properties of silty soil subjected to repeated freezing and thawing in deep seasonal frozen area, the static properties were studied on silty soil under different freeze-thaw cycles, coefficient of consolidation, water content and confining pressure. The results showed that stress-strain relationship of silty soil was work-hardening, and mainly in a ductile failure state. Correlation analysis results showed that there were good relationships between static properties, such as static modulus and static strength, and freeze-thaw cycles, coefficient of consolidation, water content and confining pressure. The cohesion decreased with in creasing of the number of freeze-thaw cycles, but there was no changing law for the internal friction angle.
Study on Stability of Highway Subgrade Slope in Desert Region
Authors: He Jing Yu , Liu Guo Hua
Published: March 2013

With the rapid development of economy, highway infrastructure is gradually extended to desert region. But at present, affected by the special engineering geological environment in desert areas, the work must be majorly planned and considered before the highway project is set that how to reduce the construction cost while ensuring the desert highway construction quality, and maximizing the maintainance and further improvement of desert environment. The wind and sand environment characteristic of desert areas is analyzed in this paper, then the common types of desert highway subgrade slope are investigated and the stability of wind-blown sand subgrade slope is studied, finally the theories and methods according to the characteristics of the desert subgrade are proposed.
Study on Preparation and Adsorption Performance of Gelatin Microspheres for Cr(VI)
Authors: Wang Xue Chuan , Hao Xiao Li , He Bao Yuan , Qiang Tao Tao
Published: March 2013

A novel microspheres adsorbent was prepared by the emulsion-congealed crosslinking method. The gelatin was as raw material and glutaraldehyde was as the crosslinking agent. The SEM images showed that the product was spherical, the distribution was uniform and not sticky. The TG result showed that the thermal decomposition form of gelatin microspheres was single and the thermostability was good. The XRD results indicated that the crystalline state of gelatin had not been affected by crosslinking of glutaraldehyde. The adsorption performance of gelatin microspheres to Cr(Ⅵ) was studied by the static adsorption experiments. The application conditions were optimized by single-factor experiment. The results showed that the optimum conditions were that pH was 3.0, temperature was 35°C and time was 1.5h.
A QSPR Model for Prediction of the Impact Sensitivities of some Nitro Compounds
Authors: Shuo Gao
Published: March 2013

The impact sensitivity is a very important property for indicating the safety, reliability and stability of high-energy-density materials (HEDM). A quantitative structure-property relationship (QSPR) study was used for prediction of impact sensitivity of some nitro compounds. Employing the square of nitro group charge (QNO22) and OB100as the parameters, a good QSPR model was built for predicting H50of two sorts of nitro compounds. The predictive ability of the model was assessed by leave-one-out cross-validation method. The cross-validation results shows that the model is significant and stable, and its predicted accuracy is within 0.21 m. This quantitative model may be a useful tool for the design of HEDM.
Isobaric Vapor-Liquid Equilibrium for Ethyl Acetate-Isopropanol-1-Octyl-3-Methylimidazolium Tetrafluoroborate
Authors: Shi Xiu Min , Wang Min
Published: March 2013

Abstract: In order to study the possibility of separating ethyl acetate and isopropanol by extractive distillation with ILs as an entrainer. Isobaric vapor-liquid equilibrium data for ethyl acetate + isopropanol+1-octyl-3-methylimidazolium tetrafluoroborate ([OMIM]BF4) ternary system at 101.32 kPa were determined using a recirculating still. The results showed that the ionic liquid (IL) studied produced a notable salting-out effect, which enhanced the relative volatility of ethyl acetate to isopropanol and eliminated the azeotrope when the mole fraction of IL in the liquid phase was greater than 0.10. Therefore, [OMIM]BF4 can be used as the extraction agent of extractive distillation for ethyl acetate + isopropanol systerm, the suitable mole fraction of [OMIM]BF4 is about 20%. The experimental data were correlated with the NRTL model, the correlated results agreed well with the experimental data.
The Influence of Different Preparation Methods on the Activity for CO Oxidation on the LDHs-Supported Gold Catalysts
Authors: Huo Yan Shan , Zhu Lin Hua , Sun Yan Lin
Published: March 2013

Au nanoparticles supported on MgAl-LDHs has been synthesized by coprecipitation method, gold colloid routs as well as intercalation and assembly method respectively. The influence of the above different preparation methods on the activity of the gold catalysts for CO oxidation was investigated, and the phase and gold particle size distribution of the catalysts were analyzed by XRD and TEM respectively. The results show that 100% conversion of CO on the fresh prepared gold catalysts synthesized by gold colloid routs and intercalation assembly method can be achieved at room temperature when the catalysts were activated at 473K for 2h in the air. The gold particle size distribution was range from 2nm to 7nm.
Detection of the Intermediate in Preparation of Ammonium Polyphosphate by Temperature Factor
Authors: Liu Gou Sheng , Liu Yue Long
Published: March 2013

Ammonium polyphosphate (APP) is a long chain polyphosphate salt, it has six crystalline forms. In preparation of APP, temperature is significant to controllably obtain a certain crystalline forms. In this paper, the effect of temperature is investigated during the preparation process of APP. Some intermediates are detected, the XRD spectra of these intermediates are discussed. The results show that temperature at 2800C is suitable for preparation of form II. With temperature increasing, water insolubility increases. The results are informative for controllable preparation of APP in industrial production.
Photosynthetic Responses of Four Urban Tree Species Exposed to Elevated CO2 and/or Elevated O3
Authors: Xu Sheng , Gao Jiang Yan , Chen Wei , He Xing Yuan , Huang Yan Qing
Published: March 2013

We compared the differences in photosynthesis of four urban tree species (Ginkgo biloba, Pinus tabulaeformis, Quercus mongolica and Pinus armandii) exposed to long-term elevated CO2(700 ppm) and/or O3(80 ppb) fumigation in (open top chamber) OTC. Our results suggest that elevated CO2alleviated the damaging influence of elevated O3on photosynthesis in the four urban tree species. Both Q. mongolica and P. armandii showed photosynthetic acclimation after long-term treatment under elevated CO2. The combined effect of elevated CO2and O3caused the changes including net photosynthetic rates (Pn), stomatal conductance (gs) and chlorophyll content that were more similar to ambient air (CK) or slightly lower than elevated CO2, indicating that elevated CO2is able to totally or partly alleviate the harmful effects of elevated O3on urban tree species.
Photocatalytic Degradation and Kinetics of Methyl Orange with Bi-Doped TiO2 under Simulated Sunlight
Authors: Rong Chuan , Dong Xiao Li , Ma Chun , Zhang Xin Xin , Shi Fei
Published: March 2013

Bi-doped TiO2 was prepared with sol-gel method and was characterized by X-ray photoelectron spectroscopy (XPS). The photocatalytic degradation and kinetics of Methyl orange with Bi-doped TiO2 under xenon lamp irradiation were investigated. The optimum conditions were as follows: the initial concentration of Methyl orange was 20 mg/L, the value of pH was 3.0 and the dosage of Bi-doped TiO2 was 1.0 g/L. Under the optimal conditions, the decolorization rate of Methyl orange was 75.1 % and the kinetic constant was 0.0113 min-1.
Preparation of Fe-Ni/C Composite Catalyst for the Hydrazine Hydrate Catalytic Reduction
Authors: Zhou Jin Hua , Sun Han Zhou , Gao Hai Li , Wang Ye , Wu Yu Xiong
Published: March 2013

Hydrazine hydrate catalytic reduction (HHCR) is a green, eco-friendly method to reduce aromatic nitro compound to aromatic amine. Fe-Ni/C composite catalyst for HHCR was prepared. Preparation conditions of Fe-Ni/C composite catalyst were investigated taking o-chloronitrobenzene’s hydrazine hydrate catalytic reductions as the examples. Experimental results showed that the optimal conditions were as follows: preparation temperature is 50 °C, catalyst carrier is nitric acid treated activated carbon, w(Fe) is 5% and w(Ni) is 0.2%. During the preparation, ultrasonic treatment is also helpful to improve catalytic efficiency of Fe-Ni/C composite catalyst. The newly prepared Fe-Ni/C composite catalyst has combined the advantages of noble metal catalyst and iron-based catalyst and features good reduction selectivity and high catalytic efficiency.
Experimental Study on the Recovery of the Zinc from Iron Tailings in Hebei
Authors: Jia Qing Mei , Li Feng Jiu , Wang Hui Jing
Published: March 2013

This article conducts mineral processing experimental study on a certain iron tailing ore in Hebei. According to the ore characteristics, the final flowsheet of stage grinding - weak magnetic - strong magnetic - anionic reverse flotation is determined to sort the ore. Under the conditions that grinding fineness is -200 mesh accounting for 60.0%, collector is butyl xanthate and activator is copper sulfate, this test can obtain zinc concentrate that grade is 36.25% and recovery is 84.15%
Extraction of Aluminum by AlCl Disproportionation Process in Vacuum
Authors: Feng Yue Bin , Yu Qing Chun , Yang Bin , Dai Yong Nian
Published: March 2013

The extraction of aluminum by the AlCl disproportionation process in vacuum was researched using the furnace designed by ourselves. The features of aluminum products were characterized by X-ray diffraction, scanning electronic microscope and energy-dispersive X-ray spectroscopy. The results indicated that the purity of aluminum products increased with decreasing condensation temperature; aluminum products could be oxidized as their size was too small; the residues of the extraction of aluminum from alumina could be further treated with this process to generate metallic aluminum with a little carbon; aluminum products with high Al4C3, C and Al2O3 impurities could be purified by this process. The conclusions could provide bases for the industrial application of the process.
Study on Raw Materials Ratio Factor in Synthesis of Ammonium Polyphosphate with Crystalline Form V
Authors: Liu Gou Sheng , Liu Yue Long
Published: March 2013

A non-P2O5 process to prepare ammonium polyphosphate is studied in this paper, the effect of raw materials is investigated. The XRD spectra of synthesized product are studied in detail. Results show that when the ratio of Mono-ammonium hydrogen phosphate to urea is 0.8:1, ammonium polyphosphate form V is the mostly occurrence. The results are informative for controllable preparation of APP in industrial production.
The Reasearch on the Controll System of the Electric Loop of the Hot Strip Mill
Authors: Xu Hua , Wen Rong Tian
Published: March 2013

This paper introduced the control of the electric loop on the hot strip mill. The loop mainly support the strip steel, form the loop variable which can adjust the dynamic speed of the mill, keep the pulling force of the strip steel between the framework, participate the speed control of the framework of the finishing rolling and the quality of the strip steel is ensured.
Heterogeneous Fenton System Dynamic Decolorization of Simulated Dye Wastewater
Authors: Bi Yan Jie , Ma Yu Kun , Zheng Sheng Liang , Wang Bin Song
Published: March 2013

Using heterogeneous Fenton system dynamic method, a decolorization test was operated for three kinds of simulated dye wastewater (Reactive Red KE-3B, Reactive Yellow KE-4R and Reactive Blue KN-R). Through the single factor experiments to examine the pH, H2O2 dosage, catalyst dosage, reaction temperature and residence time of simulated dye wastewater effected on the simulated dye wastewater decolorization rate. Determined the best decolorization reaction conditions as pH value of 4, the H2O2 concentration of 800 mg/L, catalyst dosage of 20 g, reaction temperature of 60 °C and reaction residence time of 9 minutes. Under this reaction conditions, in heterogeneous fenton system, degradation rate of the three kinds of simulated wastewater reached 95.01%, 93.86% and 97.74%, respectively.
Determination the Component of Foaming Agent and its Natural Degradation Characteristics
Authors: Hou Su Xia
Published: March 2013

A lot of foaming agents are used during the mining mineral processing. The foaming agent is hard to degrade and remains in the wastewater and chemical oxygen demand (COD) is far exceeded the standard in mine water. In this paper, the component of foaming agent made in Guangxi province was determined and analyzed through experiments. At the same time, the effect and the contribution of foaming agent to the COD materials in the water were also been studied. The degradation performances of foaming agent in different conditions such as pH, initial density and temperature, with aeration or without aeration, with ultraviolet ray or without ultraviolet ray were studied particularly. The result of this study provided the scientific basis in choosing the appropriate new environmental foaming agent and reduced the content of COD in the flotation wastewater.
Experimental Research of Low-Grade Tin-Iron Ore Separation
Authors: Nie Yi Miao , Dai Qi Hui , Lu Xiao Long
Published: March 2013

Iron ore and tin mineral are the mainly recovered minerals of the low-grade ore, which could be effectively separated by a strong magnetic separation-gravity concentration process, with ore iron grade of 20.3%, tin grade 0.18%. Stage grinding and stage separation was used, getting the grade of iron concentrate and the recovery rate of tin separation index, the feeder of tin was magnetic separation tailing, by shaking table re-election, obtained tin concentrate grade was 10%, production was 0.34% (compared to the original ore, tin dressing) .Tin concentration ratio reached more than 330.
Fatigue Deformation Behavior of FGH96 Superalloy under Low Cycle Fatigue Loading
Authors: Gu Yu Li , He Yu Huai , Liu Chang Kui , Tao Chun Hu
Published: March 2013

Low cycle fatigue failure tests of the powder metallurgical nickel based superalloy FGH96 at 550°C and 720°C were carried out under total strain-controlled mode (R=-1). The fatigue failure behaviors were investigated by analyzing cyclic stress response and observing microstructure after fatigue through scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The results show that FGH96 superalloy exhibits cyclic stability at 550°C, and cyclic softening afterwards at 720°C with Δε/2=0.4% , and of cyclic softening at 720°C with Δε/2=0.7%. After high temperature low cycle fatigue, the γ′ precipitates are cuboidal for all samples. No coarsening of γ′ precipitates was detected at 550°C and at 720°C with Δε/2=0.4%, but small γ′ precipitates get together to be larger precipitates at 720°C with Δε/2=0.7%. EBSD shows that the continuous small angle grain boundaries are produced during the fatigue. The small angle grain boundaries have a significant increase at 720°C, especially that case at Δε/2=0.7%.
Incorporation of Multiwalled Carbon Nanotubes to Ordinary Portland Cement (OPC): Effects on Mechanical Properties
Authors: Cui Lei
Published: March 2013

Due to the outstanding mechanical properties, carbon nanotubes (CNTs) are considered to offer the probability to enhance the properties of high-performance cementitious composites，and to reduce ecological cost of construction materials. Recent work in the area of concrete materials research has shown the potentiality of improving concrete properties by adjusting the mic-structure of cement hydrates, addition of nanotubes and controlling the delivery of admixtures. In this study, the multiwall carbon nanotubes (MWCNTs) were effectively dispersed in the water solution by applying ultrasonic energy. The results show that small amount of effectively dispersed MWCNTs can visible increase the strength of the cementitious matrix.
Plastic Deformation of Polyvinylidene Fluoride and Polypropylene Suture Materials Used for Hernia Repair
Authors: Wang Ying Chu , Zhang Pei Hua
Published: March 2013

This paper studied the irreversible plastic deformation of PVDF monofilament. The four-element creep model was applied to obtain the theoretical creep curves with experimental data using nonlinear regression. The results were compared to the commonly used material PP monofilament. The results showed that four-element model was a suitable model to describe the creep behavior of PVDF monofilament. PVDF monofilament exhibited reduced irreversible plastic deformation under different stresses and elongation rates. It was more stable and recoverable. PVDF could be an advantageous alternative suture material to the traditional suture materials.
Productive Technology and Application of Reflective Thermal Insulating Coatings in Construction
Authors: Liu Hong Mei , Shen Yang
Published: March 2013

In this paper, productive technology and application of reflective thermal insulating coatings at home and abroad in the field of architecture has been introduced. Its testing device has been designed, and the related factors which influenced its thermal properties has been analyzed. The silt sintered brick combined with reflective thermal insulating coatings. Its feasibility has been analyzed whether it could make indoor reach a certain temperature condition.
The Effects of Rolling Process on Microstructures and Properties of High Nb X80 Grade Pipeline Steel
Authors: Ye Xiao Yu , Zhang Kai Hua , Zuo Jun
Published: March 2013

In Gleele-3500 Thermal Simulation Test Machine，conduct Thermal Simulation Experiment for High Niobium X80 Grade Pipeline Steel at Different Deformation Temperature, Deformation Extent and Coiling Temperature. Analysis the Microstructure Was Influenced by Different Rolling Process. According to the Thermal Simulation Experiments, Designed Test Scheme of Controlled Rolling and Controlled Cooling and Completed the Trial. the Results Showed that: for High Niobium X80 Grade Pipeline Steel, the Microstructures Are Acicular Ferrite and Have Good Mechanical Properties. the Low Temperature Impact Toughness Are More than 300J in -20°C and -40°C.
Analysis of Synonymous Codon Usage in the US5 Gene of Duck Plague Virus
Authors: Hu Xiao Huan , Wang Ming Shu , Cheng An Chun
Published: March 2013

The Duck Plague Virus (DPV) US5 gene was identified by constructing the DPV genomic library, the synonymous codon usage in the US5 gene of DPV and 11 reference herpesviruses have been investigated by using the CodonW 1.4 program, CUSP (create a codon usage table) program and CHIPS (calculated ENC value) of EMBOSS (The European Molecular Biology Open Software Suite). The results reveals that the synonymous codons with A and T at the third codon positon have widely usage in the codon of US5 gene of DPV. G + C compositional constraint is the main factor that determines the codon usage bias in US5 gene. In addition, rare condons analysis showed that there are 75 rare condons (13.9%) in the ORF of the DPV US5 gene on line (http//:www.kazusa.or.jp/codon), There were 20 codons showing distinct usage differences between DPV with Escherichia coli, 19 between DPV and yeast, 25 between DPV and Human. Therefore the yeast expression system may be suitable for the expression of DPV US5 gene.
D-Lactic Acid Production from Xylose in Engineered Escherichia coli SZ470
Authors: Zheng Zhao Min , Tian Tian , Wang Jin Hua , Wang Yong Ze , Zhou Sheng De
Published: March 2013

WD100, knocked out adhE of Escherichia coli SZ470 and inserted ldhA into Escherichia coli WD01, was genetically engineered to utilize xylose. D-lactate production was investigated for shake flask cultures with xylose. In 64h WD100 produce 10.1g/L D-lactate in the shaking flask And it consumed 25g/L xylose during the ending of fermentation.This volumetric productivity with xylose is 0.14 g·L-1·h-1.Because of pyruvate decarboxylase (poxB) expressed in flask fermention,acetate production was up to 4.7g/L.Succinate,formate,ethanol was also produced as a minor product during fermentation.
Experimental Study on Absorption Heat Pump of Waste Heat and Ground Source
Authors: Zhong Xiao Hui , Wen Zhi Mei , Zhao Bin , Jia Nan
Published: March 2013

With the sinter waste heat as driving heat source, the experiment table of absorption heat pump combined waste heat and ground source was build. Experimental study is conducted with the process of stable and variable condition, and operating characteristics in different conditions were obtained. The system operating results provide reference for energy use patterns of heat pump combined waste heat and ground source.
Screening of a Mortierella isabellina Mutant for Producing Arachidonic Acid
Authors: Chen Ming , Zhang Chun Zhi , Yu Yong Peng , Zu Guo Ren , Chen Li
Published: March 2013

Arachidonic acid (AA) is an essential component of structural lipids in the cellular membranes of mammals. To obtain efficient AA-producing microorganism, the strain of Mortierella isabellina 3410 was subject to mutagenesis by treating the wild-type spores exposed to ultraviolet or diethyl sulfate. A mutant of M. isabellina MS-1 was screened and chosen because of its higher AA production capability. Compared with the wild strain of M. isabellina 3410, the AA production by mutant of M. isabellina MS-1 was increased about 2.5 folds. Analysis by gas chromatography (GC) indicated that AA was the main fatty acid in the lipids extracted from the dried mycelia of the mutant of M. isabellina MS-1.
The Research of the Pigskin Ploygeline Anti-Fatigue of Peripheral Muscle Effect
Authors: Zhang Xiao Qiang , Dong Wen Bin , Zhang Min
Published: March 2013

This test according to more suitable conditions and a better process hydrolyze pigskin gelatin preparing anti-fatigue peptide. We establish animal muscle peripheral fatigue model through weight-bearing swimming and feed polygeline to mice implementation of nutrition intervention. In the detection of blood lactate, blood urea nitrogen, liver (muscle) glycogen content and exercise time, we analysis and evaluate gelatin peptide peripheral fatigue effect. Experimental results show: comparing with distilled group, gelatin peptides can be extended to animal movement time (P<0.01), reducing the blood lactate (P<0.01) and urea nitrogen (P<0.01) after movement, improving the content of the liver (muscle) glycogen (P<0.01). This production has significant anti-fatigue effect and can be used as an anti-fatigue food additive.
Influence of Blocking Agents on Non-Specific Background of Polystyrene Microbeads in Serum Immunoassay
Authors: Ren Zhi Min , Nie Xi , Ai Sheng Shu
Published: March 2013

In this paper, we used bovine serum albumin and polymer as the blocking agents and investigated the effect of blocking agents on non-specific background of polystyrene microbead that used the human serum immunoassay.The results showed that the nonspecific background is lower by using polymer blocking agents. The best blocking condition was that microbeads were blocked by PVXT (0.5% polyvinyl alcohol PVA, 0.8% polyvinylpyrrolidone, 0.05% Tween-20, PBS phosphate buffer, pH7.0) for two hours at room temperature.
Analysis of Volatile Oil in Selaginella doederleinii Hieron from Various Habitats by GC-MS
Authors: Wang Gang , Song Hang , Yao Shun , Zhang Zhi Rong
Published: March 2013

This research aimed to analyze the chemical components of the essential oil of the Selaginella doederleinii Hieron from various habitats and provide scientific basis for its quality control. The essential oil was extracted by the microwave-assisted extraction. Then the components of volatile oil were separated and identified by GC-MS. There were 12 common constituents in different habitats which were 2-pentyl-Furan, caryophyllene, beta-Ionone, dibenzofuran, phytone , DIBP, dibutyl phthalate, leinoleic acid methyl ester, qctadecatrienoic acid methyl ester, hexadecanoic acid, margaric acid and octadecanoic acid. Moreover, the chemical constituents of volatile oil were different in different habitats.
Ultrasonic-Assisted Extraction of Total Flavonoids and Lactones from Ginkgo Biloba Powder
Authors: Cong Jing Xiang , Wang Shao Yan , Zhang Wei , Tang Xiao Dan
Published: March 2013

This article aims to study the extraction conditions of the total flavonoids and lactones from the ginkgo biloba powder. First, the influencing factors and levels for the extraction were determined by the single factor method, and then the optimum extraction conditions were optimized by orthogonal experimental design. The results showed that the optimal conditions for ultrasonic extraction of the total flavonoids were as follows: 2mg cellulase and 0.1g raw material (ginkgo biloba powder) were dissolved in 10ml water solution. The pH of the solvent was 4.5 adjusted with hydrochloric acid. The materials were extracted in ultrasound bath at 55°C for 40min. The optimal conditions for ultrasonic extraction of the total lactones were as follows: 7mg cellulase and 0.1g raw material were dissolved in 10ml water solution with pH 4.9. The raw materials were extracted at 50°C for 35min. Under the optimum conditions, the peak area contents were nearly 90% and 58% for total flavonoids and lactones, respectively.
Analysis of Bacterial Communities in A2O Membrane Bioreactor Treating Oily Wastewater
Authors: Duan Zheng Hua , Pan Liu Ming , Wang Hua , Li Ning Tao
Published: March 2013

To improve the efficiency of oily wastewater purification, a laboratory-scale anaerobic/anoxic/aerobic (A2O) membrane bioreactor was designed to treat the oily wastewater based on the conventional A2O activated sludge process and membrane separation technology, and the variation of bacterial community structure in the activated sludge of key reactors were investigated by PCR-DGGE (denaturing gradient gel electrophoresis). The result of Shannon diversity index comparing indicated that MBR seemed to be more constant than the A/0 system. Four sensitive dominant bacteria were verified in the treatment of oily wastewater. They were Uncultured Comamonadaceae bacterium, Hydrogenophaga sp., uncultured beta proteobacterium, and uncultured Thiobacillus sp. It suggested that PCR-DGGE can be used as an effective supplementary method for verifying cultural dominant microorganisms in activated sludge of oily wastewater.
Sample Preparation for HPLC Determination of Free and Oligosaccharides-Bound Sialic Acid in Bovine Colostrum
Authors: Zhu Min Peng , Li Su Hong , Zhao Xiu Hong , Guan Peng
Published: March 2013

An analytical method was developed for determining free and oligosaccharide-bound sialic acids in bovine colostrum by HPLC. The condition of acid hydrolysis for sample and sialic acids derivatization were investigated. The sialic acids were released from their parent oligosaccharides by acid hydrolysis using 40mL 0.1mol/L sulphuric acid for 100min. They were then derivatized using O-phenylenediamine (OPD) at 70°C for 40 min, the determination of the derivative could be carried out by UV detection. The total content of free and oligosaccharide bound sialic acids in bovine colostrum milk were 941.95μg/mL. The developed method is validated on various dairy products such as bovine milk and milk-based products.
Effect of Vacuum Pre-Cooling on Quality Changes of Spinach during Cold Storage
Authors: Xie Jing , Zhu Jun Wei , Lin Yong Yan
Published: March 2013

Vacuum pre-cooling technique was used as a rapid cooling method for leafy vegetables such as lettuce, spinach and so on. Experiments were carried out to investigate the effect of vacuum pre-cooling on physiological activities during cold storage. The results revealed that the increase in weight loss and membrane permeability was inhibited, and the sensory quality was improved. Meanwhile, the decompositions of chlorophyll and soluble solids were delayed. Taking all these into account vacuum pre-cooling treatment can significantly extend the shelf life of spinach.
The Catalytic Performance Comparison of Two Different Pyrrolidone Type Ionic Liquid in Biodiesel Production from Soybean Oil
Authors: Xu Yuan Dong
Published: March 2013

Two different ionic liquid of the N-(3-sulfonic group) propyl pyrrolidone hydrosulfate ([C3SO3Hnhp]HSO4) and the 2-pyrrolidone hydrosulfate ([Hnhp]HSO4) have been synthesized and used as catalyst for the biodiesel production from the soybean oil. The former exhibited better catalytic performance than that of the later one and the reaction conditions corresponding to [C3SO3Hnhp]HSO4 were optimized. Under the optimal condition the yield of methyl ester reached 93.6% and after repeatedly used for four times the catalytic activity for [C3SO3Hnhp]HSO4 still maintained in a high level.
Salt Tolerance of Four Biodiesel Plant Species on Germination
Authors: Yang Jing Hui , Li Jian Ke , Huang Jun Xun , Liu Yan Jun , Wu Chun Xia
Published: March 2013

Due to increasing salinity problems and biodiesel production, in this experiment four vegetables species were treated with different concentration of NaCl solution and the growth values were evaluated on germination to be able to understand salinity tolerance of main biodiesel plant species and screen better species which is possible to be cultivated on salinity land. Results indicated that salinity caused significant reduction in germination vigor (GV), relative percentage of germination (RGP), relative radicle length (RRL). Under higher salt concentration (9g/L), GV of soybean was lowest; GV of camelina and rape was highest. Soybean was sensitive to salinity stress under 3-6g/L according to relative percentage of germination (RGP). Under conditions of the higher salt stress (9g/L), RGP of rape and camelina was higher than oil sunflower and soybean. When saline concentration was 6g/L, the differentiation of RRL was more remarkable between species and rape had highest RRL (33.5%), next was camelina (26.5%), soybean (20%) and RRL of oil sunflower was lowest (12.4%). RRL of four species was less than 11-14% and RRL of camelina was higher than others when saline concentration increased into 9-12 g/L. All species had not any growth under salt concentration of 15g/L. Camelina had higher concentration of salinity tolerance (CST, 6g/L) than other three species, the rest was 2-3g/L. Camelina and rape had higher half lethal concentration (HLC, 9g/L), next was soybean (6g/L), and lowest one was oil sunflower (3g/L). Salt tolerance ranking for the four species based CST and HLC was camelina > rape > soybean > oil sunflower. It is possible for camelina to grow in saline soil in North of China after its suitable cultivation system is established.
Preparation and Properties of Multiple Layer Silk Fibroin Film Incorporating Sulfadiazine Sodium
Authors: Li Shao Qun , Tang Yu Bin , Jia Jun Qiang , Jiang Ming Zhu , Yan Hui
Published: March 2013

Silk fibroin film (SFF) has good mechanical property, cells compatibility and biodegradability, and was widely used in the biomedical area as controlling materials. In this work, silk fibroin (SF) was obtained from cocoons. It was dissolved in distilled water to form 5 % and 8 % (W/V) SF solution, which was used to prepare 0.5 %, 1.0 % and 2 % (W/V) sulfadiazine sodium (SD) solution. Five layers of SFF was prepared with salivation method, dried under 37 °C, and annealed with 90 % (V/V) methanol. The structure information was analyzed by FT-IR and SEM, SD release in PBS (0.2 mol/L, pH 7.4) and PBS containing 2 U/ml trypsin at 37 °C was measured. The FT-IR spectra showed that more β-sheet was formed after annealed by methanol; a lot of pores were in the SFF and SD was embedded in SFF through analyzing the image of SEM. The release speed from SFF made by 5 % SF solution was faster than that from SFF made by 8 % SF solution. As for SFF containing different concentration of SD, the release rate improved with the increase of concentration of SD, however, the time of reaching the maximum were approximate. In PBS with trypsin, the time of reaching the maximum accumulative release was one hour earlier compared with in the PBS. Therefore, we draw a conclusion that the SFF incorporating SD has good properties and it has the feasibility to be used as artificial skin for burned patients.
Research on a Device of Seawater Desalination Based on Pressure-GAS Distillation Techniques
Authors: Cai Wei , Zhang Yan , Li Peng Wei , Ma Qing Fen
Published: March 2013

People’s demand for water resource is increasing continuously at this moment. People should desalt seawater based on pressure-gas distillation techniques in order to ease the tensions of water resource and to come out the comprehensive utilization of seawater. According to its principle, it is applied to the relatively systematic process design of the main evaporation equipment of the device of Seawater Desalination. Operating parameters and types of the other devices are also illustrated. This equipment has advantages of simple structure, low cost, easy to maintain and the strong ability in producing fresh water. It can accumulate valuable experience for future study of the device of seawater desalination.
The Research on Food (Drug) Use of Fungal Polysaccharides
Authors: Zhao Chun Hai , Liu Zhi Gang
Published: March 2013

Fungus polysaccharide has important economic and medicinal value. This paper discusses the food ( drug ) use of fungus polysaccharide chemistry, relationship between structure and function and its development prospect.
Differences in Thermal Stability and Surface Morphology of Dopa and Dopamine Graft Compound
Authors: Xiong Xiong , Li Ding Hai , Wang Yue Feng
Published: March 2013

L-3, 4-Dihydroxyphenylalanine(DOPA) has a unique catechol moiety found in adhesive proteins in marine organisms, such as mussels and polychaete, which results in strong adhesion in aquatic conditions. Conventional efforts incorporating DOPA into polymer is grafting methacrylate anhydride. For this reason, we synthesized the new catechol intermediate N-methacryloyl 3,4-dihydroxyl-phenylamine and analyzed the surface morphology and thermal stability of it.
Fermentation of Carotenoid by Rhodotorula sp.D with the Utilization of Corn Steep Liquor
Authors: Zhao Xiao , Wang Jin Hua , Wang Yong Ze , Zhao Jin Fang , Fu Gang , Fang Xian Kun
Published: March 2013

The fermentative production of carotenoid by Rhodotorula sp.D with the utilization of corn steep liquor were investigated at laboratory scale and then performed for industrial trial. The optimal inputs of waste syrup (glucose) and corn steep liquor of 7% and 33.3% were determined by single factor tests, with the highest carotenoid yeild of 11.7 mg/L and content of 383.6 μg/g (carotenoid/biomass) for 5L fermentation. The same conditions were then carried out in a 1000L fermentor for industrial trial. After 41 h fermentation, there were 31% of crude protein and 180.4 μg/g of carotenoid in the final spray dried products. These results show that as a non-expensive bioresource, corn steep liquor can be utilized for fermentative production of carotenoid, which will increase its potential as functional feed in industrial usage.
Molecular Dynamics Simulation of Liquid Cu-Ni Alloy Using Embedded Atom Method
Authors: Fang Teng , Wang Li , Qi Yu
Published: March 2013

Molecular dynamics simulation has been performed to explore the thermodynamics and dynamics properties of liquid Cu-Ni alloy based upon developed embedded atom methods (EAM), namely due to G. Bonny. The calculated liquid density shows that the potential underestimates the measured atomic density for Ni-rich composition. The calculated mixing enthalpy predicts the potential underestimates the mixing enthalpy when the concentration of Ni is increased beyond roughly 30 at. %. We make a conclusion from the fact that the G. Bonny’s model is not full perfect in describing the density and mixing enthalpy of Cu-Ni melts at the Ni-rich composition.
Synthesis and Photovoltaic Properties of Poly(p-phenylenevinylene) Derivatives Modified by Thiophene Derivatives
Authors: Huang Mei Hua , Tian Zong Fang , Huang Hui
Published: March 2013

Two novel conjugated polymers (P1 and P2), consisting of 2,5-dioctyloxy-1,4- phenylenevinylene and terthiophene derivative based on 3,4-ethylenedioxythiophene, named TTh-Oxa, with oxadiazole side chains, have been synthesized via the Witting–Horner reaction. Another poly(p-phenylene vinylene) (PPV) derivative P3 was also prepared for comparison. The introduction of TTh-Oxa unit in polymer benefits to widening and red shifting the absorption spectra of PPV derivatives. Photovoltaic cells were fabricated with the as-synthesized polymers as the donors and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as the acceptor in a 1:4 weight ratio. The device based on P1 showed a maximum power conversion efficiency of 0.64 % under simulated AM 1.5 G solar irradiation (100 mW/cm2).