bluuebunny/crossref_metadata_2025 huggingface dataset:
Adsorption of Heavy Metal Ions from Aqueous Solution by Chitosan
Authors: Linghu Wen Sheng , Wang Chao
Published: January 2014

In this work adsorption of heavy metal ions (Cu2+, Pb2+, Zn2+and Ni2+) from aqueous solution by chitosan was investigated in a batch reactor. Three commercially different viscosity chitosans were used as adsrobents. pH value, adsorption temperature, time and initial concentration had affected adsorption efficiency of metal ions. The results showed that low viscosity chitosan has the highest adsorption capacity among the low, middle and high viscosity chitosans. The amounts of adsorbed metal ions decreased with increased adsorption temperature and decreased pH value. The highest adsorbed amount at the equilibrium time (7.5mg/g) of Cu2+was observed among Cu2+, Pb2+, Zn2+and Ni2+.
Simultaneous Desulfurization and Denitrification from Flue Gas Using Urea/Piperazine Solution
Authors: Wang Fang , Chen Ting , Jin Mei , Lu Ping
Published: January 2014

The simultaneous desulfurization and denitrification performance from the N2-SO2-NO simulated flue gas using the urea solution as the reduction absorbent and piperazine as the additive was investigated. The influences of the concentration of urea solution and the concentration of piperazine solution on the simultaneous desulfurization and denitrification behavior were also discussed. The experimental results showed that the addition of piperazine in the urea solution could enhance the denitrification performance, which could result the desulfurization efficiency of 94.07% and the denitrification efficiency of 85.11%.
CO2 Capturing by MDEA-PZ-TETA in a Rotating Packed Bed
Authors: Jin Mei , Zhou Li Yan , Lu Ping , Wang Jin Huang , Yu Guo Xian
Published: January 2014

The absorption performance of CO2 using MDEA-PZ-TETA ternary absorbent in a rotating packed bed was investigated. The effects of the concentration of the ternary absorbent, the absorbing liquid temperature, the rotating speed, the liquid flow rate and gas flow rate on the absorption performance of CO2 were discussed in detail. The experimental results showed that the optimum absorption condition was the absorbent concentration of 0.05 mol/L, the absorption temperature of 290 K, the rotating speed of 454 rpm and the ratio of gas to liquid of 1.2, which could provide a molar absorption saturated capacity of 1.3688 molCO2/molAm and a satisfying CO2 absorptivity of 93.18%.
The Calculation Methods of the Heat Balance for Recovering the Vaporous Water from Exhaust Gas in Ammonium Phosphate Production
Authors: Zhu Dan , Song Peng Yun
Published: January 2014

The volume content of water vapor in ammonium phosphate exhaust gas is about 12-20%, and the temperature is about 70-80°C. If the exhaust gas are directly discharged through the chimney, the water vapor in it will easily condense and fog because of local supersaturation, resulting in some energy and water losing. The cool water spray condensing can be used to recover water vapor from exhaust gas, and it can recover most of the water vapor and the sensible heat and the latent heat of the water vapor in the exhaust gas. Carrying out the energy balance and material balance calculations quickly and accurately is one of the major concerning problems for project design. This paper presents a calculation method for the heat balance by calculation the enthalpy difference of the water in the exhaust gas, compared with the method by directly calculating the heat in water vapor condensing process. Both the results are in good agreement, but the enthalpy difference method is more concise. The calculation methods and procedures are of practical engineering application values.
Simulation and Analysis of Cryogenic Air Separation Process with LNG Cold Energy Utilization
Authors: Xiong Yong Qiang , Hua Ben
Published: January 2014

In this paper, a cryogenic air separation process with LNG cold energy utilization is proposed to produce liquid nitrogen and high pressure pure oxygen gas economically. To reduce the electric energy consumption of air separation products, liquid nitrogen have been produced by condensing the separated pure nitrogen gas with LNG cold energy utilization, and the recycled nitrogen is served to transfer cold energy from LNG stream to cool off air stream in the proposed cryogenic air separation process. The specifications of streams and the major equipments of the air separation process are simulated with Aspen Plus software and the main parameters analysis are performed. The results show that the energy consumption of the proposed air separation process with LNG cold energy utilization decreased about 58.2% compared with a conventional cryogenic air separation process. The compressed pressure of recycled nitrogen has a big impact on the cost of air separation products and utilization efficiency of LNG cold energy. The LNG cold energy could be fully utilized when the recycled nitrogen has been compressed to above 6.5MPa.
Crystallization Kinetics of CaOx in Artificial Urine and in Saline System
Authors: Deng Lan Qing , Xue Jun Fa , Kuan Li , Ouyang Jian Ming
Published: January 2014

The crystallization kinetics of calcium oxalate (CaOx) was comparatively studied by detecting the change of free Ca2+ ions concentration with the reaction time in artificial urine and in saline system. The dynamics equations of CaOx crystallization was r=kcα, and the average reaction order (α) was 3.3 regardless of the relative suprasaturation degree (RS) of CaOx in the range of RS=10.58~17.53. The average reaction rate constant (κ) was (0.97±0.1)×109 in artificial urine and κ=(3.1±1.8)×109 in saline system, due to the presence of inhibitors to CaOx crystallization in artificial urine.
Functional Properties of the Protein Isolate and Major Fractions of Pine Nut Proteins Prepared from the Changbai Mountain in China
Authors: Wu Dan , Min Wei Hong , Liu Jing Sheng , Fang Li , Li Hong Mei , Yang Sheng Li , Liu Jing Lan , Li Lu
Published: January 2014

The functional properties of protein isolate and major protein fractions prepared from Changbai Mountain pine nuts were investigated. Albumin, globulin, glutelin, and protein isolates were obtained after the Osborne method and alkaline dissolution and acid precipitation, and protein contents of the fractions are 48.02%, 81.93%, 83.02%, and 89.69%, respectively. For the sulfhydryl contents, albumin is the highest, and glutelin is the lowest. In a disulphide bond, the protein isolate content is the highest with a value of 28.74 μmol/g, and the glutelin content is the lowest with the value of 13.46 μmol/g. For the four kinds of proteins, the essential amino acids in percentage of total amino acids are 31.13%, 34.22%, 30.30%, and 34.54%, respectively. The pH dependent protein solubility profile reveals that the minimum solubility is at pH 5.0, which corresponds to the isoelectric point. Protein isolate has the minimum water absorption capacity with a value of 0.59 ml/g. On the other hand, albumin has the minimum oil absorption capacity with a value of 2.11 ml/g. The emulsifying activity and stability and the foaming activity and stability increased with increasing concentration of four kinds of proteins. SDS-PAGE results showed that these four kinds of proteins have different molecules.
Study on Liquor Wastewater Treated Process by Domesticated Activated Sludge to Produce Polyhydroxyalkonoates
Authors: Bian Ming Hong , Ye Guang Bin , Luo Hui Bo , Deng Jie , Chen Yan
Published: January 2014

In this paper, the activated sludge from liquor-making factory was domesticated by adding the Yellow water to simulate wastewater, and the well-treated activated sludge was used to deal with the wastewater from liquor-making factory. The results show that: compared with the activity of activated sludge with appropriated addition of the Yellow water or not, the activated sludge, which was acclimated with the Yellow water, can increase the capability of activated sludge in dealing with wastewater. Through 16-hour cycle reaction system with the well treated activated sludge, COD of liquor wastewater was decreased to 95mg/L, and at the same time Polyhydroxybutyrate can accumulate about 33.2% of DCW.
Study on Extraction and Detection of α-Androstenol in Truffle
Authors: Huang Zhi Guo , Wei Chun Hui , Luo Hui Bo , Liu Yan Mei , Deng Jie
Published: January 2014

In order to fully exploit the truffle resources, this article took fresh and mature truffles as raw material, studied on extraction and detection of α-androstenol. The experiment used acetone as extracting agent and used ultrasonic wave extraction method to extract α-androstenol. Then the extracting solution was concentrated by Termovap Sample Concentrator, and was detected by GC-MS. The results showed that: using acetone as extraction agent, ultrasonic temperature at 50°C, ultrasonic frequency in 40KHZ, time for 60min, after concentrated and detected by external standard method for quantitative. The detected results showed that: in mature truffles, the content of α-androstenol was 0.0193μg/100g, the content of its isomeric compounds was 0.707μg/100g; in immature truffles, the content of α-androstenol was 0.0087μg/100g, the content of its isomeric compounds was 0.238μg/100g.
Study on Separation of 11S and 7S Fractions from Soy Protein by Different Techniques
Authors: Xu Jing , Zhang Xiang Ting , Zhao Qing Shan , Zhang Xiao Song
Published: January 2014

This experiment material was the Northeast Agriculture-42 soybean, the conditions for extraction and separation of 11S and 7S fractions from soy protein were optimized. The factors affecting extraction effect,including extraction solution, extraction time, kinds and dosages of sediment, and the pH conditions were improved, and optimization of separation method of 7S and 11S in soy protein with orthogonal test. This results shown that: 11S globulin in extraction time 120 min, CaCl2 precipitation agent concentration 30 mmol / L, acid sinking pH 6.2, and yield was 81.3 %; 7S globulin in extraction time 90 min, CaCl2 precipitation agent concentration 10 mmol/L , acid sinking pH 6.2, and yield was 86.9 %.This research was the actual production of 7S and 11S in soy protein provides theory basis.
Isolation and Purification of Soybean Antioxidant Peptides
Authors: Yang Rui Wen , Wang Jia , Lin Song Yi
Published: January 2014

The soybean protein was hydrolyzed by Alcalase Food grade (FG) 2.4 L and the degree of hydrolysis (DH) were determined. The DH increased with the hydrolysis time increasing during 3.0 h. Then the hydrolysates was isolated by ultrafiltration membrane (1, 3, 10 kDa) and antioxidant activity was evaluated based on DPPH radical scavenging activity. The fraction of 1-3 kDa possessed the higher antioxidant activity than the other fractions (P < 0.05). Sephadex G-25 gel column was used to purify the three kinds of peptides and the eluted volume was investigated.
Study on Thermal and Mechanical Properties of Polyurethane Systems for In-Mould Decoration Ink
Authors: Lin Jing , Zheng Cheng , Qian Shu Xuan , Cai Xian Fang , Lan Yong Shun , Zhang Dong Ming , Zhuang Jia Wei
Published: January 2014

In this study, three polyurethane systems A (A450/RD181/L75), B(A450/RD181/N3390) and C(A450/RD181/2104/N3390) for in-mould decoration ink were studied. The results of thermogravimetric analysis showed that introducing rosin modified phenolic resin 2104 (RMPR) and N3390 into PU system A can improve the thermal stability, Moreover, Measurements of gel fraction and swell ratio showed that incorporation of N3390 is benificial for increasing the cross-linking density of PU systems as compared to L75 so as to increase the gel fraction and decrease the swell ratio.The tensile strength of cured PU systems increased following in the order: A<B<C, elongation at break is just the opposite. In addition, it is indicated that incorporation of N3390 is benificial for increasing the cross-linking density of PUs so as to improve the the shore A hardness and decease the water sorption.
Cure Monitoring of Epoxy Resin by Simultaneous DSC/FTIR
Authors: Wang Li Wei , Fernando Gerard F.
Published: January 2014

The cross-linking kinetics of an epoxy/amine resin system was studied using the conventional DSC and FTIR spectroscopy, respectively. Conventional DSC was modified to accommodate two fibre optic probes which could be used to monitor the spectra of epoxy/amine resin system during cure. The cross-linking kinetics for the epoxy/amine resin system obtained via the conventional DSC and FTIR and simultaneous DSC/FTIR were similar. The feasibility of using a simple bifurcated fibre optic probe to link the DSC to the FTIR spectrometer was demonstrated.
Fabrication of Raspberry-Like Gold Nanoparticles and their Applications in Surface-Enhanced Raman Spectroscopy and Catalysis
Authors: Wang Chun Rong , Yan Xian Zai , Yu Lili , Li Jian Dan
Published: January 2014

The raspberry-like gold nanoparticles were synthesized with high yields following reduction with hydrochloroauric acid and peptide (Boc-Leu-Aib-Trp-OH) in methanol solution. Peptide acted as reducing agent. The prepared raspberry-like gold nanoparticles are effective application for surface-enhanced Raman scattering in ascorbic acid (Vc). Here, we also demonstrate the effective catalysts of raspberry-like gold nanoparticles for the activation and reduction of methylene blue in the presence of NaBH4.
Toxicity of Copper Oxide Engineered Nanoparticles to Maize (Zea mays L.) at Different Aging Times
Authors: Sui Hai Jun , Zhang Jun Zhe , Wang Zhen Yu
Published: January 2014

With more and more extensive use of copper oxide nanoparticles ( CuO ENPs), potential risks have emerged to draw public attention. While toxicity data is still in lack of CuO ENPs to maize as the main agricultural crops in soil-cultivated. This research have reported the phytotoxicity of CuO ENPs at 0, 500, 1000 mg/kg concentration to maize (Zea mays L.) during different aging times from 0 d to 90 d in soil. CuO ENPs at 500 mg/kg presented more toxicity to maize than at 1000 mg/kg while growth inhibition decreased with the aging time.
Numerical Simulation Study on the Key Influencing Factors of Water-Invasion Performance for the Gas Wells with Bottom-Water
Authors: Li Zhi Jun , Li Ji Qiang , Yan Wen De
Published: January 2014

For the water-sweeping gas reservoir, especially when the water-body is active, water invasion can play positive roles in maintaining formation pressure and keeping the gas well production. But when the water-cone break through and towards the well bottom, suffers from the influencing of gas-water two phase flows, permeability of gas phase decrease sharply and will have a serious impact on the production performance of the gas well. Moreover, the time when the water-cone breakthrough will directly affect the final recovery of the gas wells, therefore, the numerical simulation method is used to conduct the research on the key influencing factors of water-invasion performance for the gas wells with bottom-water, which is the basis of the mechanical model for the typical gas wells with bottom-water. It indicate that as followings: (1) the key influencing factors of water-invasion performance for the gas wells with bottom-water are those, such as the open degree of the gas beds, well gas production and the amount of Kv/Kh value; and (2) the barrier will be in charge of great significance on the water-controlling for the bottom water gas wells, and its radius is the key factor to affect water-invasion performance for the bottom water gas wells where the barriers exist nearby.
Plywood with Soy Protein - Acrylate Hybrid Adhesive
Authors: Jin Chun Nan , Zhang Shi Cheng , Pang Jiu Yin , Gao Zhen Guo
Published: January 2014

This paper is mainly aimed at the problem of low bonding strength of soy bean protein adhesive,poor water resistance,with methyl methacrylate and vinyl acetate composite study made with rubber manufacturing class II plywood,meet the national standard,so as to solve the water resistance of soy protein adhesives and bonding strength of.Experiments that 3.5g soy protein, 5g PVA, 30g MMA, 0.3g APS and 100g water, modified soy protein adhesive bonding strength obtained is excellent, and cost reduction.Preparation of soybean protein-acrylate adhesive solid content,viscosity and strength of plywood detection.
Preparation of Anti-Fouling Poly(Lactic Acid)(PLA) Hollow Fiber Membranes via Non-Solvent Induced Phase Separation
Authors: Shen Peng , Tu Kai , Yang Chang Yu , Li Jian , Du Ru Xu
Published: January 2014

Anti-fouling PLA hollow fibers were fabricated using synthesized PLA-PEG-PLA copolymer as an additive to improve the hydrophilicity. The tri-block copolymer was prepared by ring-opening polymerization and a hydrophilic copolymer processing good compatibility with PLA molecule was obtained and utilized to fabricate membrane with PLA by NIPS. Elemental analysis showed that PLA-PEG-PLA could stably exist in membranes and endow the membrane with persistent hydrophilic. Thus the contact angle decreased nearly 20o with 5% PLA-PEG-PLA content, resulting in higher water permeability and BSA rejection which indicated the anti-fouling property of PLA membrane was improved.
A Study of Oxalic Acid Adsorption on the Surface of Natural Mica
Authors: Ke Mei Zhen , Chen Qing Hua , Zhou Wei Ming , Wu Nan , Qian Qing Rong , Yuan Zhan Hui , Huang Xiao Min
Published: January 2014

This paper reports an increment of conformal metal oxides or nonmetal oxides films with good crystallinity coating on natural mica synthesized by liquid phase deposition. PEG1000 and KH550 were used to increase the adsorption of oxalic acid on the mica surface. Hence, the metal ions can react with the oxalic acid, resulting in uniform and compact thick films. The potasrmanganate titration and infrared ssium pepectroscopy were adopted to obtain the optimum dosage of PEG1000 and KH550. It is shown that the condition with the usage of PEG1000 of 0.4 g/L, KH550 of 9.76 g/L, temperature of 30 °C and mixing of 4 hours is appropriate.
Preparation of Two Magnetites and Application for the Removal of Fluoride from Waters
Authors: Yang Qin , Wang Jing , Zhou Li Ying , Zeng Hong Xia , Wei Shi Yong
Published: January 2014

Two magnetites (M-20 and M-80) were successfully prepared by two different methods. The XRD patterns showed that M-20 was a poorly crystalline magnetite and M-80 possessed a relatively well crystallinity. For M-20 and M-80, the specific surface area (SSA) was 48.53 and 26.72 m2/g; at pH 5.0 the zeta potential was 28.34 and 23.51 mV; and the isoelectric point (IEP) was 6.8 and 7.0, respectively. At pH 5.0, the Langmuir adsorption capacity for fluoride of M-20 and M-80 was 12.45 and 9.89 mg/g, respectively. This indicates that M-20 is a higher efficient adsorbent for fluoride removal from waters compared to M-80. Langmuir model was suitable to fit the fluoride adsorption data of M-20 and M-80 (R2 =0.988 and 0.982, respectively) and Freundlich model can not well fit the fluoride adsorption data of the two magnetites (R2 =0.937 and 0.951, respectively).
Study on the Physical and Chemical and Mechanical Pulping Characteristic of Cotton Stalk Fiber
Authors: Li Li Xia , Chen Hai Tao
Published: January 2014

Straw resource was tremendous, however it was utilized poorly. So the research of physical, chemical and mechanical pulping properties of cotton stalk fiber laid the foundation for utilization of cotton stalk. Morphology of cotton stalk fiber was determined by Feica microscope, the length, width and length to wide ratio were analyzed by SPSS 17.0. Chemical composition changes of cotton stalk fiber after mechanical process were analyzed by applying Block test method with Design-expert 6.0.10.The result present that composition of fiber had significant difference. Hemicellulose decreased by 1.68 %, cellulose decreased by8.85 %, lignin increased by 5.87 %. Beating degree was positively correlated with the pulping time, beating time and wet weight were a negative correlation. Strength of cotton stalk fiber was positively with the gramme, and strength was 8.5 N when gramme was 60 g/m2.
The Development of Microporous in Coal by Spontaneous Combustion
Authors: Di Jian You , Gao Er Xin , Sun Xian Long , Niu Hui Juan , Guo Mao Zhen
Published: January 2014

Basing on coal and the oxygen evolving complex theory, the method of study on the spontaneous combustion by analysis the microporous in coal has been established in this article. By the electron microscope, the process of microporous volume changeing with the temperature gradually increased is observed. It is believe that the process of spontaneous combustion reaction should be carried out in the microporous. Finally, under the help with finite element analysis , the temperature field surrounding microporous has been analyzed and the distribution regularity of the temperature field has been obtain. It make the conclusion that coal surface microporous can be used as evidence of coal spontaneous combustion reaction.
Water and Oil Dual-Absorption Composite Resins Prepared from High Internal Phase Emulsion
Authors: Zhu San , Luo Xiao Gang , Ma Li Bin , Xue Ya Nan , Cai Ning , Fu Zhen , Yu Fa Quan
Published: January 2014

Novel composite resins with dual absorption properties of water and oil are prepared by the polymerization of high internal phase emulsion (HIPEs) with n-butyl methacrylate as the external phase monomer and acrylamide as the internal phase monomer. The subsequent polymerization leads to the formation of water and oil dual-absorption composite resins. The morphology of porous structure and microcosmic phase separation after water/oil uptake is observed by scanning electron microscopy (SEM). The water and oil absorbency strongly depend on composition. The composites with saturated water uptake could absorb the chloroform again but cant absorb water if saturated with chloroform first. And the resins exhibit great reusability, keeping almost constant absorbency. The present methodology could be a potential approach to obtain amphiphilic composites, which possess potential applications in the bioengineering, medical and industrial fields.
Investigation into Coating Surface Free Energy and Microstructure of Coated Paper Related to Pigment
Authors: Li Ying , Gu Wen Juan , He Bang Gui
Published: January 2014

The physical structure of coating layer have an important influence on transferring and setting of the printing ink. In this study, the effect of pigment on surface microstructure and surface free energy was investigated. The findings indicated that the pigment affected the pore size, depth and distribution of the coated paper surface. Kaolin pigment compared with calcium carbonate pigment was good to improve the paper surface smoothness. Surface free energy of kaolin pigment coating was higher than calcium carbonate pigment coating, which showed that surface wettability of coating with kaolin pigment was better than calcium carbonate pigment.
Removal of Phosphorus from High-Phosphorus Iron Ores by Sodium Roasting
Authors: An Juan , Yang Wen Qiang , Yuan Xiao Li , Xia Wen Tang
Published: January 2014

The phosphorus removal from high-phosphorus iron ores by sodium roasting was studied. The effects of ratio of NaOH to NaCO3, roasting temperature and reaction time on the dephosphorization ratio were investigated. The results showed that the dephosphorization ratio can reach 80.1% under the conditions of ratio of NaOH to NaCO3 5:6, roasting temperature 1100°C, and reaction time 120min. After sodium roasting, the content of phosphorus in iron ore sample complied completely with the requirements of steel production.
Study on Solid Surface Sizing Agent for Paper
Authors: Wang Zheng Shun , Yu Wei Li , Dong Hong Xiang
Published: January 2014

The analysis of all kinds of selected chemicals, mixed starch was donethrough a specific process and orthogonal experiments. The best proportion ofthe new type of surface sizing agent was prepared through the glue applicationexperiments, testing paper physical properties. The results showed that thebest formula of surface sizing agent including borax, sodium silicate,anhydrous sodium sulfate, ferrous chloride which ratio is 3:4:2:1. At the sametime modifying agent was added so that the stable performance can be obtainedfrom the solid surface sizing agent. Homemade solid surface sizing agent canmake paper greatly improve the sizing degree, increased by 50.9%, the stiffnessof the tear strength increased by 56.7%, folding degrees increased by 53.0%.Compared with the surface sizing agent market, various aspects index improvedsignificantly.
Hydrothermal Synthesis of Zn1-x CoxO Room Temperature DMS
Authors: Zheng Wen Li , Yang Wei
Published: January 2014

Zn1-xCoxO crystals were synthesized by hydrothermal method with 3mol/L KOH as mineralizer. The fill factor was 35%, reaction temperature, 430°C and reaction time, 24 hours. When the Zn ( OH )2doped with CoCl26H2O was used as precursor, many different shapes of Zn1-xCoxO crystals were obtained in the hydrothermal synthesis products. The Co concentration in the crystal was determined by electron probe, the atomic percentage of Co in the crystal increased as the concentration o f CoCl26H2O in precursor increased. The measurement of magnetism was carried out by using a superconducting quantum interference device ( SQU ID ). It is found that the magnetization varies unobviously as the temperature rises below the room temperature. The hysteresis loop of Zn1-xCoxO crystals was obtained at 300K and shows the ferromagnetism at the room temperature.
Research on Pinholes in Aluminum Foil
Authors: Dai Qing Wei , Zhang Ding Fei , Chen Xi , Dong Jing Ren , Pan Fu Sheng
Published: January 2014

To investigate pinholes in 8079 Aluminum foil, optical microscopy and scanning electron microscope with energy dispersive spectrometer were adopted. Results show that four types of pinholes in 8079 aluminum foil, (1) small size, rod-shaped, (2) pinhole in groove, (3) hole with big size, (4) crumpled pinholes. Big compounds along with all rolling and heat treatment processes cause the small rod-shaped pinhole. The big compound contains elements of Al-Fe-O.
Research Progress on Heat Treatment Processes of 7000 Series Aluminum Alloy
Authors: Zhong Li Ping , Zhao Li , Zhou Long
Published: January 2014

The research progress of homogenization, solution and aging heat treatment processes and their effects on microstructure and properties of 7000 series aluminum alloy was reviewed in this paper. The solution and aging process were analysed mainly. The problems existing in the industrialization application of heat treatment of the alloy and the demanding problems to be solved in research and development in the future were described.
Structure and Properties of r-PET/TPEE/LDPE-g-AA Blends
Authors: Huang Qiao Ling , Zhang Hua Ji , Zhang Wen , Lin Xin Tu
Published: January 2014

The blends of recycled poly (ethylene terephthalate) (r-PET)/thermoplastic polyester-ether elastomer (TPEE)/acrylic acid grafted low density polyethylene (LDPE-g-AA) were prepared by extrusion and injection molding. The mechanical, morphological and rheological properties of the blends were investigated by mechanical test, SEM and torque rheometer, respectively. The results show that the Charpy impact strength of the blends increases to the maximum when adding 3 wt % LDPE-g-AA and then decreases with the further increase of LDPE-g-AA contents, while the tensile strength of the blends decreases with the increase of LDPE-g-AA contents. The SEM shows that the particle sizes of TPEE in the blend containing 3wt% LDPE-g-AA become much smaller than that in the uncompatibilized blends, and a more uniform and better islands-in-sea morphology is obtained. Furthermore, the addition of LDPE-g-AA decreases the viscosity of the blends, leading to an overall improvement of processability. From these results above, it can be concluded that the introduction of LDPE-g-AA increases the compatibility and processability of r-PET/TPEE blends effectively.
Combustion Kinetic Analysis of Lignite in Different Oxygen Concentration
Authors: Zhang Yong Feng , Chen Xiang Yun , Zhou Quan , Zhang Qian Cheng , Li Chun Ping
Published: January 2014

Combustion behavior of indigenous lignite in oxygen-enriched conditions was investigated by using thermogravimetric analyzer (TGA). Combustion tests were carried out in different oxygen concentration (21%O2/79%N2, 30%O2/70%N2, 40%O2/60%N2, 50%O2/50%N2, 60%O2/40%N2, 70%O2/30%N2). Then get the characteristic temperatures. . The model-fitting mathematical approach was used to evaluated the kinetic triplet (f (α),E,A) through Gorbatchev method. The combustion stages were divided into the early combustion stage and the later combustion stage. The calculation showed that the kinetics parameters higher in the early combustion stage than that in the later combustion stage.
Study on Residual Stresses and Fatigue Properties of Friction Stir Welding Joint
Authors: Zhang Teng , He Yu Ting , Shao Qing , Hou Bo , Gao Chao
Published: January 2014

Friction Stir Welding (FSW) is a new type of solid-state connection which can reduce structural weight significantly. In this paper, fatigue tests and finite element analysis were employed to study fatigue properties and residual stresses of aerial aluminum alloy 2524-T3 FSW joint. The residual stresses in FSW joint were obtained by a nonlinear direct coupled-field finite element analysis. On the basis of finite element analysis results, the fatigue life of FSW joint was estimated. It is verified that the analytic and estimated results agree with that of experiment.
Effect of Armillaria mellea on Blood Lipid Levels and Antioxidant Enzymes Activity in High Fat Mice
Authors: Yang Yan Hui , Zheng Guo Qiang , Tang Juan , Wang Yue Meng , Zhu Chuan Wang , Ji Hai Yu , Xu Xiao Ming , Liu An Jun
Published: January 2014

The effect of Armillaria mellea on blood lipid levels and oxidative stress in mice fed on high-fat diet was investigated. Animals were allocated to the Armillaria mellea polysaccharides-treatment groups (I, II) and Armillaria mellea oligosaccharides-treatment groups (I, II). All mice were fed with high-fat diet for 40 days but control mice with basic diet. TC, TG, HDL-c, LDL-c were measured by enzymatic and colorimetric methods. The same, MDA,SOD, GSH-PX were measured. Results showed that administration of Armillaria mellea polysaccharides and oligosaccharides significantly increased antioxidant enzymes GSH-Px activities and decreased TC, TG, LDL-c, MDA level in mice (P < 0.05) compared with model group. In conclusion Armillaria mellea polysaccharides and oligosaccharides were able to protect mices antioxidative and improve abnormal blood lipid levels.
Isolated Strains of Nontuberculous Mycobacterium Interfere with Immune Responses Associated with Mycobacterium Bovis BCG Vaccination
Authors: Wang Chun Fang , Qi Hua Rui , Jiang Xiu Yun , Ma Hong Xia , Qian Ai Dong , Wang Chun Feng
Published: January 2014

Prior exposure of a vaccine to certain species of environmental mycobacteria can prime the immune system against common mycobacterial antigens, which can in turn reduce the subsequent efficacy of live attenuated mycobacterial vaccines (such as Mycobacterium bovis BCG), in both human and livestock vaccination programs. In this study, five strains of nontubeculous mycobacterium, all isolated from lymphonodi mandibulares and lymphonodi mesenterici samples of swine and cattle, were investigated to determine their growth characteristics and effects on the immune system in murine models. Markedly, different effects on the immune system were observed. The different results may be linked to the inherent growth characteristics of the five strains, The implications of these findings for BCG vaccination protocols are discussed.
Laboratory Research on Enhancing Oil Recovery of Three Bacteria D1-3
Authors: Cheng Ming Ming , Lei Guang Lun , Liu Jian Ying , Yang Jian
Published: January 2014

A group of petroleum-degrading bacteria were obtained from the sludge samples that collected from the Triassic Yanchang 6 reservoir. Of these, three strains with maximum degradation performance were tested in this study. The chromatographic analysis showed that the content of molecules with 30 or more carbons of oil was reduced by 18.36%. Core flood experiments with different flooding rate showed that the oil recovery of microbial flooding was increased by 8.76% than water flooding. The research ruled out that the three strains have well compatibility with the reservoir with remarkable result of petroleum-degrading.
Microbial Production of 1,3-Propanediol by a Newly Isolated Citrobacter freundii Strain CF-5
Authors: Yu Yue , Shi Li Tao , Guo Wen Yi , Yang Hong Jiang
Published: January 2014

Microorganisms tolerant to 1, 3-propanediol (1, 3-PDO) were screened out from various environmental samples, and isolate CF-5 was found to produce 2.8 g/L 1, 3-PDO with glycerol as carbon source. Based on 16S rRNA gene sequence analysis, CF-5 was identified as aCitrobacter freundiistrain. The fermentation conditions of strain CF-5 were analyzed. Higher biomass production was obtained in the medium supplemented with limited amount of glucose without repression of conversion efficiency of glycerol to 1, 3-PDO. Under the combined aerobic and oxygen limited incubation conditions, higher yield of 1, 3-PDO was reached. The fed-batch fermentation was performed in a 5 L bioreactor, 1, 3-PDO was found mainly produced in exponential growth phase cells ofC. freundiiCF-5 with the highest productivity 0.63 g/L*h, and the overall yield of 1, 3-PDO fermentation was 11.8 g/L within 36 h fermentation.
Comparison Study on Measuring Ammonia and Nitrogen in Surface Water by Flow Injection and Nessler's Reagent
Authors: Zeng Yong Gang , Chen Lin , Li Hai Xia , Huang Jin , Yu Bo
Published: January 2014

This paper compared the measurement of ammonia and nitrogen in surface water by spectrophotometry and flow injection analysis, and the results indicate: Nessler method detection range of 0.02~2.0 mg/L, and detection limit is 0.02mg/L; flow injection detection range 0.01~ 10mg/L, and the detection limit is 0.001mg/L, 50 samples analyzed rate is 50 samples/h; flow injection is simple and in good linearity, and the sensitivity, precision and accuracy can meet the analytical requirement with better analysis speed, low consumption of reagents and samples, which is a sensitive, selective and friendly analysis method, which will be the future development trend.
Physical Properties and Antimicrobial Activity of a Poly(Lactic Acid)/Poly(Trimethylene Carbonate) Film Incorporated with Thymol
Authors: Wu Yan , Yuan Ming Wei , Yang Ji Yi , Qin Yu Yue , Yuan Ming Long , Cao Jian Xin
Published: January 2014

Thymol (TH), which has antimicrobial effect on many food pathogens, was incorporated as antimicrobial agent into composite poly (lactic acid)/poly (trimethylene carbonate)(PLA-PTMC) films. Antimicrobial active films based on PLA-PTMC were prepared by incorporating thymol at five different concentrations: 0, 3, 6, 9 and 12 %(w/w). The mechanical characterization, water vapor permeability (WVP), and antimicrobial activity of all formulations composite film were carried out. A decrease in elastic modulus was obtained for the active composite film compared with neat PLA-PTMC film. The presence of thymol decreased water vapor permeability, with a significant antimicrobial activity. Antimicrobial activities of films were tested against Escherichia coli, Staphylococcus aurous, Listeria, Bacillus subtilis, and Salmonella. Increasing amount of the thymol in the film caused a significant increase in inhibitory zones. These results suggest that thymol incorporated PLA-PTMC films have a prospectively potential in antimicrobial food packaging.
Physicochemical Characteristics of Bacteriocin Produced by Pediococcus pentosaceus H6
Authors: Sun Jing Li , Liu Hui , Zhang Hong Xing , Xie Yuan Hong
Published: January 2014

Lactic acid bacteria H6 was isolated from dried yak jerky by plate dilution method, and using theListeria monocytogenesas indicator, the Oxford cup method was used to test the bacteriostasis effect. Lactic acid bacteria H6 were identified asPediococcus pentosaceusby 16S rRNA sequence. The growth curve ofPediococcus pentosaceusH6 was determined by Turbidimetry, and the antibacterial activity of bacteriocin H6 was measured by two fold dilution method and the Oxford cup method. Studying on the thermal stability and pH stability, our results indicated that the barteriocin H6 has better antibacterial effect in acidic conditions or at 100 °C for 90min. The antibacterial spectrum of bacteriocin H6 proved its good inhibitory effect on proliferation ofListeria monocytogenesand other Gram-positive bacteria, and had a certain inhibitory effect onEscherichia coliand other Gram-negative bacteria, showing a broad-spectrum antibacterial property, which demonstrate its great potential in food preservation
Properties of Anaerobic Activated Sludge in Biohydrogen Production Reactor
Authors: Qin Zhi , Bai Guang Yu , Zhang Qi , Cui Yong Yan , Zhang Chao Yu
Published: January 2014

For the properties of activated sludge studies, three kinds of activated sludge were obtained from continuous hydrogen production reactor. Activated sludge was got under organic loading rate (OLR) of 3, 7 and 25 kgCOD/m3·d condition, respectively. Sedimentation performance and activities of sludge were investigated. When OLR was 3 kgCOD/m3·d, activated sludge showed good sedimentation performance. After 30 minutes sedimentation, the volume of activated sludge in total mixture volume was about 39%. When OLR was 7 and 25kgCOD/m3·d, after 30 minutes sedimentation, the volume of activated sludge in total mixture volume was 80% and 83%, respectively. The increase of biomass is the main reason for increase of sedimentation performance. MLVSS/MLSS of activated sludge was 37.7% and 79.6% under OLR of 3 and 25kgCOD/m3·d condition, therefore, activities of activated sludge was high under high OLR condition. Since sedimentation performance of sludge is high under high OLR condition, hydraulic retention time should controlled carefully in engineering operation.
Screening and Mutation Induction by DBD Plasma of Potassium-Solubilizing Bacteria
Authors: Zhu Xiao Li , Dong Li Ping , Liu Jiao Qin , He Song Jie , Du Hang Hang
Published: January 2014

Thirty seven strains of potassium-solubilizing bacteria were isolated from rhizosphere soil samples of different plants in Shannxi, China. Among them, six strains were selected by their high capacities of dissolving potassium,and then DBD plasma mutation was conducted to them for improving their releasing potassium activity. The results showed that the releasing potassium activities of most of the mutants increased compared with their initial wild-type strains. The potassium-solubilizing activity of the best mutants called VD-4-1 increased to 20.12mg/l. In comparison to its original strain, the ability of releasing potassium of VD-4-1 increased to 1.91 times. Through 16sr RNA sequence detection, VD-4-1 was identified as Enterobacter sp.. It demonstrated that DBD plasma treatment had a high-efficient quality, and it will be a useful method for micro-organisms mutation.
Keywords: Potassium-solubilizing bacteria, Ability of releasing potassium, Dielectric barrier discharge (DBD) plasma mutation
Two New Natural Products from the Roots of Raphanus sativus L.
Authors: Wu Shun Bin , Wang Feng , Jin Xiao Bao , Liu Tao , Wu Li Rong , Wang Wei , Mei Dan , Zheng Zhong , Zhu Jia Yong
Published: January 2014

The roots ofRaphanus sativusL., also called radish, has been used as a traditional anti-migraine drug in China for hundreds of years. However, its bioactive substances and pharmacological mechanism were still not very clear. In this study, two new natural products were isolated from the roots ofRaphanus sativusL.by successive chromatographic procedures, such as open silica gel, Sephadex LH-20 and RP-18 column chromatograph. The structures of isolated compounds were elucidated as Cis-(1-methylazetidin-2-yl) methanol and cyclo- (4-methyl-Val-4-methyl-Val) on the basis of spectral data analysis, including MS and NMR (1H-NMR,13C-NMR, NOESY, HSQC and HMBC). The new natural products would be potential candidates for early anti-migraine drug study.
Design, One-Pot Synthesis, and Evaluation of 7H-Thiazolo[3,2-b]-1,2,4-Triazin-7-One Derivatives as Dual Binding Site Acetylcholinesterase Inhibitors
Authors: Liu Si Jie , Shi Lan Xiang , He Jing Yu , Cui Li Bo
Published: January 2014

In order to study the the structure-AChE inhibitory activity relationships of 7H-thiazolo [3,2-b]-1,2,4-triazin-7-one derivatives, the 7H-thiazolo[3,2-b]-1,2,4-triazin-7-ones were designed by molecular docking, and readily prepared via a one-pot reaction in N-methyl pyrrolidone hydrosulfate ([Hnmp]HSO4) lonic liquid. The study of AChE inhibitory activity was carried out using the Ellman colorimetric assay with huperzine-A as the positive control drug. Most of the target compounds exhibited more than 50% inhibition at 10μM.
Effects of Process Parameters on Hydrophobicity of Alumina Surfaces Fabricated by Hard Anodizing
Authors: Li Jing , Li Qiang , Xu Jin Kai , Yu Hua Dong
Published: January 2014

In the present article, hard anodizing technique was used to prepare alumina films on aluminum alloy substrate. The change of the water contact angles on the surface of the as-anodized samples with the hard anodizing process parameters was studied. The wettability of the alumina films was reinforced by means of controlling the surface microstructure. The rough structures can trap a large amount of air and minimize the real contact area between surfaces and water droplets. The measurement of the wetting property showed that the water contact angle of the as-anodized samples increases from 82° to 130° with adjusting hard anodizing process parameters. In a word, the rough structure on the surface prepared by adjusting hard anodizing process parameters plays a vital role in the constructing of the stable hydrophobic surface on aluminum alloy.
Embedment Strength of Pinus sp. Wood to Metal Pins
Authors: Henrique de Almeida Diego Henrique , Hendrigo de Almeida Tiago Hendrigo , Molina Julio Cesar , Ferro Fabiane Salles , Christofóro Andre Luis , Lahr Francisco Antonio Rocco
Published: January 2014

To know the physical and mechanical properties of wood to be employed as structural elements in is an important factor for its use in a rational way. The connections between members of timber structures are also relevant topic once local stress concentrations can occur and safety must be seriously taken in account. Brazilian Code ABNT NBR 7190: 1997 "Design of Timber Structures" provides guidelines for connections calculation based on two alternative limit states: wood strength to embedment or bending of the bolt. The purpose of this paper is estimate the strength to embedment of Pinus sp. to bolts in three directions with respect to the grain: parallel, perpendicular and inclined at 45o. Specimens obeying requirements of Brazilian Code related to bolts diameter (10mm) were prepared and tested. The embedment strength in parallel direction to the fiber was the highest and the failure modes were more frequent crushing and cleavage.
New Steel Fiber Concrete Mechanics Parameters and Contact Explosion Tests
Authors: Ge Tao , Zhang Zhi Gang , Li Qing
Published: January 2014

For getting the mechanics and contact explosion capability parameters, some new steel fiber concrete samples with 5% steel fiber were tested, many groups data were obtained with compress strength, shear strength and fracture toughness. The model tests were carried out on the new steel fiber concrete under contact explosion, the coefficient of explosion cavity radius of the material is obtained by above experiments and theory study. The two kinds of experiments above point out, the new steel fiber concrete with steel fiber has very high strength and rupture temper and its capability anti-explosion is about three times than general concrete.
Numerical Analysis of Initial Support and Secondary Lining Contact Pressure of Phyllite Tunnel
Authors: Li Xin Zhe , Wang Geng Feng , Li Xin Liang , Zhu Zhong Rong
Published: January 2014

Taking Jin Chuan phyllite tunnel as the research object, and based on numerical simulation of surrounding rock graded III, IV and V, the paper studied the stress characteristics of initial support and four other representative locations such as two arch vault, arch spandrel, arch haunch, and arch foot during and after the process of construction. The paper focuses on the stress characteristics of secondary lining in different locations after stability and the change of stress in different locations of initial lining before and after the secondary lining construction.
Numerical Simulation of Bored Pile on Foundation Pit Support in Soft Soil Deposits
Authors: Wang Jing , Liu Xiao Qing , Xie Xiao Chen , Qi Hui Jun
Published: January 2014

To the supporting method of bored cast-in-place piles on foundation pit support in soft soil deposits, using the finite element method and considering the interaction between pile group, respectively, bored piles with compound foundation and entitative beam element are numerically simulated in two ways; Compared two kinds of method to calculate the displacement effects of adjacent pipeline to the actual monitoring data, the results show that using entitative beam element are adopted to simulate the piles is more reasonable.
Study on Analysis and Application of Horizontal Static Load Test Results for Elastic Long Pile
Authors: Huang Yan Zheng , Zhang Shao Bo , Yang Wen
Published: January 2014

Based on Winkler model and engineering example, the behavior of elastic long pile under horizontal load was analyzed in test status while pile top at free. The analysis results show that under same horizontal static load, the maximum of pile shaft bending moment in work status is higher than it in test status. Directly using the horizontal bearing capacity obtained by horizontal static load test in project design is unsafe and inapposite. The horizontal bearing capacity of pile in work status can be get based on the proportion coefficient of the horizontal resistance coefficient.
The Shear Capacity Calculation of Steel Reinforcement High-Strength Concrete Short Columns Restrained with FRP
Authors: Zhou Le , Wang Xiao Chu , Bai Yun Hao
Published: January 2014

This article aims to study the calculation for shear capacity of SRHC (Steel Reinforced High-Strength Concrete) members restrained with CFS (Carbon Fiber Sheet). Experimental study, theoretical analysis and calculation simulating are integrated in this article for the research of the shear failure characteristics and effect of various parameters on their behavior of SRHC members restrained with SFC on the basis of existed SRHC members tested results. The shear strength formula of steel reinforcement high-strength concrete short columns restrained with CFS is put forward, which based on the superposed strength method. This method on the basis of the load-deformation process of CFS is similar to hooping. The results indicate that the shear capacity of SRHC columns restrained with CFS is higher than SRHC columns. And, due to the axial compression ratio, shear span ratio and the amount of reinforcement influence the shear capacity of the FRP materials. So, these three kinds of factors are also the influencing factors of shear capacity of SRHC members restrained with CFS. The effect of the internal concrete restrained with CFS is good because of the function of CFS is equal to hooping and the strain of CFS is bigger than the strain of steel, so this simple calculation method is safe , which may be useful for further study and engineering design.
The Permeability of Three Kinds of Improved Soil in Northwest Area and its Application in Foundation Treatment
Authors: Liu Wan Fu , Yang Ze Ping
Published: January 2014

Study on the permeability of three kinds of soil research, including in loess, calcareous-soil, lime and fly ash (two ash) of loess, cement-soil. Selects 10 groups of soil to determine the coefficient of permeability.The results show that: cement-soil of 3:7 can be used as impervious material than calcareous-soil of 3:7. Calcareous-soil of 3:7 can be used as seepage control material in short-term.Two-ash can not play this role; As the same time, we found that: The coefficient of permeability of all kinds of modified soil are increasing after 21 days.