bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Study of Electron Beam Welded QCr0.8 Bronze Joint
Authors: Wang Ting , Wang Hou Qin , Zhang Bing Gang , Zhong Shi Sheng , Feng Ji Cai
Published: January 2014

The butt welding test has been performed on QCr0.8 bronze by electron beam welding. Microstructure of the joint was examined by optical microscopy and scanning electron microscopy with EDS. Microhardness of the joint was determined to evaluate the mechanical property of the joint. The fusion zone and the heat affected zone became the weak area of the joint due to the growth of grains and the redissolve of strengthening phase. The decrease of strengthening phase has a major influence on the microhardness reduction of the joint..
Surface Modification of Magnesium Hydroxide by A-174 Silane
Authors: Wang Nian Yi , Liu Zhi Qi , Li Li Juan , Zhu Li Xia
Published: January 2014

The surface of magnesium hydroxide (MH) was modified with a silane coupling agent A-174 (3-methacryloxypropyltrimethoxysilane) to improve MH dispersion and hydrophobicity. The effects of modification on the resultant product and the mechanisms involved were studied through activation index analysis, thermogravimetric analysis, Fourier transform infrared spectroscopy and scanning electron microscope. The optimum modification conditions were obtained as follows: an A-174 dosage of 1.5 wt.% at 145 °C for 10 min at a stirring rate of 3000 rpm. A chemical reaction was observed between the MH surfaces and A-174. The dispersion and hydrophobicity of MH remarkably improved after surface modification.
The Impact of Sinter and Thermoprint on Film Formation of nanoTiO2 Slurry
Authors: Qian Jun , Liu Man , Zhou Yi Hua , Ma Tao Lin , Zhu Zi Qiang , He Hong Lin
Published: January 2014

nanoTiO2 is one of the most important inorganic pigments in many different fields. The effect of sinter and thermoprint on film-forming properties of nanoTiO2 in screen printing were studied in this paper. Compared with sintering, Thermoprint uses high temperature and pressure to make nanoparticles more tight. By scanning electron microscopy (SEM), X-ray diffraction (XRD) and Coating Adhesion Test, the better film-formation properties of thermoprint are demonstrated.
Research on the Coating Surface Microstructure of Coated Paper Related to Binder Migration
Authors: Li Ying , Gu Wen Juan , He Bang Gui
Published: January 2014

The surface topography and properties of coating layer have an important influence on penetration and distribution of the print ink. In this research, the main objective was to investigate the effect of binder migration on the coating surface microstructure. The surface microstructure was explored in the method of numerical and visual analysis using mercury porosimetry measurement, scanning electron microscopy (SEM) and atomic force microscopy (AFM). The findings indicated that the binder migration on the coating surface affected the pore size, depth and distribution of the coated paper surface. The little binder migration in the consolidation phase of coating color made a contribution to the forming of the coating layer, which made the coating surface more smother to printing performance.
Effects of Thermal Transfer Paper Performance on Transfer Quality
Authors: Wan Da
Published: January 2014

Four kinds of thermal transfer paper with different paper characteristics were chosen, main properties including absorbability, air permeability, roughness, whiteness, formation and ash content were tested. Same ink color pieces were printed on these samples through colour printer, then these ink color pieces were transferred onto the same fabric based on the magnetic heat press machine, contrasting color transfer rate, gloss, adhesion and other indicators, the general law of paper performance on transfer quality was discussed. Research shows absorbability, roughness and air permeability will directly affect the quality of thermal transfer quality. Lower roughness and absorbability as well as moderate permeability have a significant role to improve the heat transfer quality. The result offers a certain theoretical reference and practical guidance to the selection, research and development of thermal transfer paper.
Finite Element Analysis of Temperature Filed and Stress Field of Reducer
Authors: Zhang Jing , Wang Fei
Published: January 2014

Abstract.The connection mode of reducer with straight tube on both sides are the welding connection. There are two weld at the both side of reducer and there has a great influence on residual stress and deformation in the process of welding . Based on the particularity of reducer welding, the paper is focus on the residual stress and deformation in the process of welding, using large-scale finite element analysis software ANSYS .The DN500X450 reducer model is established.The welding temperature field and residual stress field is analysis and calculation and analysis the influence on temperature and stress distribution of reducer. The results show that the maximum of the temperature and the residual stress is located in the big side and reduce the welding seam, and the obvious deformation also find in the big side and reduce joint . The reducing pipe’s distribution of temperature field and residual stress field are obtained,providing the basis to establish properly and optimize of welding process.
Characteristics of the Sierra Leone High Alumina Iron Ore and Utilization in Sintering
Authors: Dong Jie Ji , Wang Guang , Zuo Mao Fang , Li Hua , Xue Qing Guo
Published: January 2014

The characteristics of the Sierra Leone iron ore were studied at laboratory scale by chemical analysis, XRD, SEM-EDS and TG-DSC methods. The Sierra Leone iron ore was a kind of limonite, which was mainly consisted of hematite, goethite and gibbsite. The iron ore lost its crystal water at a fast speed ranging from 200°C to 400°C and the total content of the crystal water was about 8.2 wt.%. The initial melt formation temperature of the iron ore with CaO was stably kept at around 1209°C and the amount of liquid increased with the increasing of CaO content. Its melt formation temperature is higher than Australian limonite. The sintering pot test showed that the yield of sinter decreases from 78.37wt.% to 73.36wt.% and the drum index decreases from 60.5wt.% to 49.63wt.% when the blending ratio of Sierra Leone iron ore increases from 7wt.% to 27.3wt.%.
Determined the Activation Energy of the Decomposition of Calcium Carbonate by Nonlinear Isoconversional Method
Authors: Zhang Song , Tang Dan
Published: January 2014

The nonlinear isoconversional method has been applied to data for nonisothermal thermal decomposition of calcium carbonate. It is shown that the dependence derived from nonisothermal data can reveal the complexity of solid reaction. Therefore, the nonlinear isoconversional method is recommended as a trustworthy way of obtaining the activation energy of solid reaction under nonisothermal conditions.
Study on the Coupling Behaviour of Microwave Absorption for Sulphide Concentrate
Authors: Mo Qiu Hong , Zhou Xian Wen , Su Xiu Juan , He Chun Lin
Published: January 2014

Abstract. The microwave energy absorption of solid mineral in microwave field is the key problem of the microwave metallurgy application. For the calculation formula of absorbing microwave energy (P=2πfε0ε"E2) the fundamental data is necessary, including dielectric constant and electric field strength etc. But these basic data varies in practice due to the variation of molecular structure, overall dimension, and electromagnetic parameter of the mineral. Therefore, the theoretical calculation formula is difficult to predict the microwave absorbing ability of solid mineral [1-3]. In this paper the ability of four kinds of sulphide concentrate and their mixture coupling in absorbing microwave was investigated by intermediate medium calorimetry. The results show that the microwave-absorbing ability of chalcopyrite concentrate is the strongest, sphalerite concentrate is the weakest, and sphalerite concentrate is stronger than silica, the mixture minerals still keep their own microwave absorbing characteristics. The mass percent of strong absorbent of microwave decide the microwave-absorbing ability of mixture, and affect energy transfer between microwave and mineral.
Microwave Roasting Pyrite for Removal of the Sulfur and Arsenic
Authors: He Chun Lin , Ma Shao Jian , Su Xiu Juan , Mo Qiu Hong
Published: January 2014

The application of microwave technique in the roasting pyrite which contained little arsenic was described. The characteristics of microwave absorption of pyrite were investigated. The results indicated that pyrite was a good absorbent of microwave and heated rapidly to high temperature by microwave flied in a short time, causing decomposition and oxidization to removal the sulfur and arsenic. The effects of microwave irradiation time and sample mass on the removal efficiencies of sulfur and arsenic with microwave power of 4 kW and 6 kW were investigated. The big microwave power could shorten the time for removal of sulfur and arsenic. Finally iron concentrate contained 64.52% Fe, S<0.1%, As<0.094% were obtained.
Study of Optimizing Combined-Blowing in EAF Based on K-Medoids Clustering Algorithm
Authors: Yang Ling Zhi , Zhu Rong , Dong Kai , Liu Wen Juan , Ma Guo Hong
Published: January 2014

The integrated technology of oxygen blowing and bottom blowing was the core of EAF combined-blowing. Today's process model can not exactly describe the control of combined-blowing. In this paper, the EAF steelmaking history data was analyzed by K-medoids clustering algorithm which is data mining technology. Different clustering results were obtained under the cost of steelmaking, oxygen consumption, and etc. Finally, the optimizing combined-blowing curve is found out by analyzing the classified results. In the early of smelting, the flow rate of No.1 oxygen lance and No.2 oxygen lance is increased to improve the strength of decarburization and the pace of smelting. In the late of smelting, door oxygen lance starts to be used for dynamics conditions of carbon-oxygen reaction. The two bottom blowing lance use argon instead of nitrogen after 21 minutes in order to protect the steel components.
The Dissolution of Zinc Oxide Ore in Sulfamic Acid Solution
Authors: Wu Dan Dan , Wen Shu Ming , Yang Jing , Feng Qi Cheng , Mao Ying Bo
Published: January 2014

In this study, the dissolution effect of zinc oxide ore was investigated using sulfamic acid solution as leaching agent. The effects of temperature, concentration of sulfamic acid, average particle size and stirring speed on the dissolution of zinc oxide ore were investigated. The dissolution rate increased with increasing solution temperature, concentration, and stirring speed as well as with decreasing average particle size. Sulfamic acid solution can therefore be used as an effective leaching agent for zinc extraction from zinc oxide ore.
Study on the Phase Composition and Particle Size of Boron Mud
Authors: Ning Zhi Qiang , Zhang Ling Ling
Published: January 2014

The phase composition and particle size of the boron mud is investigated by X-ray diffractometry (XRD), scanning electron microscope (SEM) and laser particle size analyzer. The mainly phase composition of the boron mud are magnesite (MgCO3) and forsterite (Mg2SiO4). The mainly phase composition of the calcined boron mud are forsterite (Mg2SiO4) and a small amount magnesia (MgO). the sizes of the boron mud are about 2~6μm and a few of them are bigger and less than 10μm and the particle size of less than 10μm is about 60%.
In Situ Observation of Inclusions Behavior in Molten State and Solidifying Interface of Tire Cord Steel
Authors: Zhu Zhi Liang , Ma Guo Jun , Yu Chen Fan
Published: January 2014

In this study, a confocal scanning laser microscopy was used to in situ observe the collision and aggregation behavior of inclusions in molten state and the pushing/engulfing behavior in the solidifying interface of tire cord steel. The results show that the inclusion particles will be captured into the grains in the solidification front for the inclusions with a diameter are larger than 53.4μm at a cooling rate of 1 K/s. Moreover, the attraction force of inclusion particles in molten state is in the order of 10-16N~10-14 N in tire cord steel.
Electrocatalytic Sensing of Nitrate at Cu Nanosheets Electrodeposited on WO3/Polyaniline Modified Electrode
Authors: Liu Bo , Zou Ben Xue
Published: January 2014

A porous copper/tungsten oxide (WO3)/polyaniline (PANI) composite modified electrode CuWP was fabricated by electrochemical deposition of copper nanosheets on WO3/PANI composite. The CuWP exhibited higher electrocatalytic activity for nitrate reduction than the similarly prepared copper modified electrode due to the larger surface area of CuWP and the synergistic catalytic effect of copper and WO3/PANI. The linear scan voltammetry results showed a good linear relationship between nitrate reduction current and concentration of nitrate from 40 to 276 μM, with a sensitivity of 4.5 μA/μM and detection limit (S/N=3) of 1.2 μM. The CuWP modified electrode was tried to be employed in determination of nitrate in drinking water.
Effect of Semi-Solid Processing on Solidified Microstructure and Mechanical Properties of Rheo-Slurries A356 Sand Cast
Authors: Chucheep Thiensak , Wannasin Jessada , Wisutmethangoon Sirikul
Published: January 2014

The effect of semi-solid processing on microstructures and mechanical properties of rheo-sulrries A356 sand cast produced by Gas Induce Semi-Solid (GISS) process was investigated. Step plate sand molds were used in this study. The results found that the initial solid fraction of rheo-slurries did not influence on the non dendritic α-Al phase size of the as-cast alloy, while no initial solid fraction of low temperature conventional casting specimens obtained dendritic α-Al phase microstructure. In addition, both α-Al phase size and dendrite arm spacing increased with increasing the casting modulus. Tensile strengths and elongations of rheo-slurry casting specimens are higher than that of conventional casting specimens. This study indicates that low initial solid fraction slurry is suitable for gravity sand casting due to higher feeding time of this alloy and obtain the highest quality index value of 400 (tensile strength of 281 MPa and elongation of 6.1%).
Study on the Relationship of the Quantity of CO2 Produced and the Wind Speed
Authors: Sun Xian Long , Gao Er Xin , Zhang Hong Fen , Wang Qiang , Li Li Juan
Published: January 2014

Based on the geological and the experimental data of the13#coal seam of Sun-Cun Coal Mine, the relationship curve between the geothermal heat in Sun-Cun coal mine and experimental wind speed has been fit out.According this and the laboratory experiments,the relational expression between the quantity of CO2 produced in the period of spontaneous combustion and the wind speed in the coal mine has been developed. The research results show that when the wind speed exceeds 2m/s,the quantity of CO2 produced has a sharp rising tendency.
Recycle of Spent Potlining with Low Carbon Grade by Floatation
Authors: Li Nan , Xie Gang , Wang Zu Xu , Hou Yan Qing , Li Rong Xing
Published: January 2014

Spent potlining (SPL) from Hall-Heroult cells is a kind of toxic solid waste with recyclable carbon and electrolyte. The recycle of SPL by floatation, which can meet environment requirements and bring economic profits, is focused on presently because of its great potential to be industrialized and spread. However, it is difficult to get a good floatation index in floatation of SPL with carbon content lower than 50%. Therefore, the dressing of SPL with 36.1% of carbon has been investigated in the paper with the interesting potential to improve the quality of floatation products by optimizing floatation conditions, such as grinding size, pulp density and agitation speed of floatation machine. And the comparative experiment has been performed. The results show that quality of both carbon product and electrolyte product were improved under optimized conditions of grinding size of 90% of the particle sizes less than 0.74mm, pulp density of 25% and agitation speed of 1700r/min. The carbon content in carbon product was raised by 5.40 and carbon content in electrolyte product decreased by 0.26 while electrolyte recovery of electrolyte product increased by 4.58.
The Effect of Ca2+, Mg2+, SO42- and PO43- on Phosphate Ore Flotation
Authors: Li Xian Bo , Liu Zhi Hong , Zhang Qin , Mao Song , Li Long Jiang
Published: January 2014

In the process of recycling phosphate ore processing wastewater, the accumulation of inorganic ions and the flotation reagents have a great influence on the flotation performance when they reach to a certain concentration. This paper studied the effect of Ca2+, Mg2+, SO42- and PO43- on the reverse flotation of phosphate ore through the single factor experiment. The experimental results show that Ca2+, Mg2+ and PO43- have less effect on the flotation performance, and that a certain amount of PO43- in the ore pulp can reduce the dosage of acid and improve the flotation result. SO42- has a significant effect on the reverse flotation of phosphate ore and the concentration of SO42- should be controlled under 1 g/L in the backwater utilization.
Electrochemiluminescence Detection of Diphenhydramine Based on Tris(2,2-bipyridyl) Ruthenium(II) Immobilized on PEDOT-PSS Modified Electrode by Electrostatic Attraction Strategy
Authors: Xiang Qian , Yang Xiao Dong , Gao Ying , Tian Ling Yun , Tang Juan , Wang Kun Qi
Published: January 2014

An electrochemiluminescence (ECL) sensor for highly sensitive detection of diphenhydramine was developed by employing tris (2,2-bipyridyl) ruthenium (II) as the detector. The ECL sensor was fabricated by immobilizing ECL reagent Ru (bpy)32+ on the poly-(3,4-ethylene dioxythiophene) and polystyrene sulfonate composite film (PEDOT-PSS) modified indium tin oxides (ITO) electrode by electrostatic attraction strategy. The ECL sensor showed an increased ECL intensity in the presence of diphenhydramine. The increased ECL intensity was direct proportion to the concentration of diphenhydramine over a range from 5.0 ×10-4 to 5.0 ×10-6 mol/L. The detection limit for the detection of diphenhydramine was 1.0 ×10-6 mol/L. Fabrication of the ECL sensor by this method is simple and easy, and hence has potential applications in the field of ECL analysis and detection.
Research and Implementation on Face-and-Body Detection of the Stray Current of Mine
Authors: Li Long Jiang , Zhang Qin , Qiu Yue Qin , Zhao Xiao Yun
Published: January 2014

The stray current of mine refers to the current, which flows in the way of the non-regulation line in mines. When go on the mine operations, in order to achieve stray current controlf high precision, it is necessary to carry on high precision detection of Stray current. Based on traditional “point” and “line” detection, the technology of “Face-and-Body” detection is researched and the detecting way of “Face-and-Body” technology is proposed in the paper. The “Face-and -Body” detection technology is implemented in three-dimensional space on the base of mathematical model of “Face-and-Body” .The “Face-and-Body” detection device includes in establishment of the hardware and software system, and development of the stray current detection current dual output voltage sensors, and so the size and direction of stray current are detected efficiently,thereby it improves the detection precision of the stray current.
Application of Virtual Instrument Technology in Mine Hoist Control Based on the LabVIEW
Authors: Chen Jia Chen , Xie Peng , Pang Lei
Published: January 2014

Based on the concept, composition and characteristics of virtual instrument technology and its LabVIEW software platform, this article proposes a new solution for mine hoist control system. Compared with the traditional monitoring system, this development time is shorter, execution efficiency is higher, and easier to study and grasp, etc. So it can be widely used in mine monitoring system.
The Revision of Paper Surface Efficiency and its Influences on Printing Qualities
Authors: Yang Yong Gang , Gao Qiao Zhuo
Published: January 2014

Paper surface efficiency (PSE), a paper property integrating gloss and absorbency, can be used to evaluate color reproduction after the interaction of paper and ink. But it was shown that the color reproduction was still related to paper whiteness in practice. In this paper, an assumed PSE formula which integrates gloss, whiteness and ink absorbency is firstly presented, and according to experimental data, it can be well forecasted that the change of these principal paper properties would affect color reproduction result via the new PSE formula. The linear relationships between new PSE formula and ink color reproduction based the description of photo-density measurement were studied subsequently. The results showed that new PSE formula can be used to predict effectively ink color effect.
Hydrothermal Synthesis and Photocatalytic Activities of La-Doped BiVO4 Microcakes
Authors: Liu Guo Cong , Xu Shi Hua , Liang Yin Jian
Published: January 2014

Novel La-doped BiVO4microcakes have been hydrothermally synthesized and characterized by XRD, XPS, SEM, and DRS techniques.The results reveal that the well crystallized and cake-like Bi0.95La0.05VO4monoclinic crystal with the diameter range of 15 μm and the width range of 0.2-0.8 μm can be obtained via a template-free hydrothermal route. Compared with pure BiVO4microcakes, Bi0.95La0.05VO4microcake shows a little red shift in the absorption band, resulting in a narrowed band gap (2.37 eV), which has the better photocatalytic activity with a 98.6 % degradation of methylene blue (MB) with a concentration of 10 mg/L under visible-light irradiation for 60 min.
Application of Electron Probe Microanalyzer (EPMA) to Depositional Environment Identification of Sedimentary Rock
Authors: He Qing Kun , Shi Chang Ying
Published: January 2014

s: Electron microprobe technology is widely used to component analysis of metals, minerals and geology. Elements of sedimentary rock including B, Ga, Ba, Sr, Co, V, Cr, Mn, Fe, Ni were analyzed by EPMA respectively. It was discussed that marine faces and continental facies, oxidation environment and reducing environment, the depth of water and salinity influence on sedimentary rock, respectively. Then the influence of marine faces, continental faces, oxidation environment, reducing environment and the depth of water and salinity on sedimentary rock was discussed respectively. The results show that EPMA is a useful instrument to analyze the components of sedimentary rock.
CFD Simulation Research on Flow Characteristics of Fluidized Beds
Authors: Han Li Ning , Wang Lu Min
Published: January 2014

The Euler-Euler two-fluid model incorporating the kinetic theory of granular flow was applied to simulate the gas-solid flow in fluidized beds. The pressure drop, particle distribution and motion characteristics were studied in this paper. In order to investigate the effect of structure of the fluidized bed on flow characteristics, fluidized beds with different diameters and structures were applied. User defined functions (UDF) were applied to study the flow characteristics when the particle size and mass changed over time. The results showed that with the increase of particle size, higher minimum fluidization velocity was required, but lower pressure drop was obtained. For a certain fluidizing medium, the bed critical fluidization velocity depended only on the size and nature of the particles. The structure of a fluidized bed had an influence on the particle distribution and motion characteristics.
Synthesis, Crystal Structure and Fluorescence Study of 8-Dimethylaminomethyl-7-hydroxy-chromen-2-one①
Authors: Li Sheng , Huang Jing , Wang Ying , Liu Peng
Published: January 2014

A new coumarin derivative 8-Dimethylaminomethyl-7-hydroxy-chromen-2-one (C12H13NO3,M= 219.23) were prepared and characterized by single-crystal X-ray diffraction. The compound crystallized in methyl alcohol system. The crystal belongs to the Monoclinic system, space groupP21/C, witha= 10.228(2) Å,b= 8.9260(18) Å,c= 12.064(2) Å,α= 90°,β= 91.85(3)°,γ= 90°,M= 219. 23,V= 1100.8(4) Å3,Z= 4,Dc = 1.323 g/cm3,μ=0.096 mm-1,F(000) = 464,R= 0.0594 andwR= 0.1611. A total of 2136 unique reflections were collected, of which 2020 withI>2(I) were observed. The quantum chemistry calculation study on the title compound has been performed by quantum chemical method in SVWN5/6-31G**level. Additionally, IR,1HNMR spectra, thermal analysis and the fluorescent properties are discussed .
Numerical Simulation of Flue Gas Flow and NH3 Diffusion Properties in SCR System
Authors: Hong Wen Peng , Jian Song Chen
Published: January 2014

The numerical model of SCR denitrification system is established. Simulate the SCR system where installs mixer by the way of installing rectifier grille and three types of guide plates to analyze the changes of velocity, pressure and ammonia concentration before catalyst layer. The results indicate that setting rectifier grille and changing the guide plate size can make velocity and pressure of the whole flow are more stable. In plan 4, the deviation of ammonia concentration at the catalyst inlet section is 3.58%, avoid the phenomenon of ammonia escape and its satisfies the design requirements of SCR denitration system Keywords: SCR denitrification system; rectifier grille; guide plates; pressure drop
Numerical Investigation on the Stirred Reactor with Rushton Turbine
Authors: Dai Li , Yang Li Bin , Liu Kai
Published: January 2014

Computational Fluid Dynamics (CFD) simulation is expected to give detailed flow information which is important for stirred reactor design and optimization, however accurate flow prediction remains a challenge for CFD application. In the present paper, influence of discretization scheme on the flow prediction in a stirred reactor with Rushton turbine was investigated. Standardk-εturbulent model and MRF model was adopted and numerical results obtained by using three different discretization schemes were compared. Results showed that the numerical results agreed well with data provided in literature. It is acceptable to use any discreticaiton method if aiming at a general flow field, while QUICK is recommended considering the more detailed flow information.
The Material Mechanical Properties Reverse Calculation Method Bases on Depth-Sensing Indentation
Authors: Xie Guo Li , Qin Feng , Yang Hong Liang
Published: January 2014

It introduced the depth-sensing indentation principle,characteristics,and the major applications and advantages in micromechanical properties and damage research. It focused on analyzing the typical load-depth test curve from the material depth-sensing indentation experiment, then talked about how the curve was used in the reverse calculation process for material mechanics properties.It can provide the technology route reference for the other metal mechanical properties research in the future.
Synthesis and Crystal Structure of Tridodecylammonium 3,5-Dinitro-1, 2, 4-1H-triazolate (TDADNT)
Authors: Zhang Tao , Liu Long , Zhang Yan Qiang , Li Zeng Xi
Published: January 2014

Tridodecylammonium 3,5-dinitro-1,2,4-1H-triazolate (TDADNT) was synthesized and characterized by NMR, IR, and Raman spectra, elemental analysis and TG/DTA. Its structure was further confirmed by the single crystal X-ray diffraction (Fig. 2), which shows that the compound crystallizes in the triclinic space group P-1 with a = 8.9507(19) Å, b = 12.702(2) Å, c = 19.068(4) Å, α = 72.440(5) o, β = 89.620(7) o, γ = 84.901(7) o, V = 2058.3(7) Å3, Z = 2. The salt is thermally stable up to 270 °C with the TG/DTA measurements.
The Stability of Potassium Ferrate in Water
Authors: Luo Kai , Cao Gang , Li Ming Yu , Ren Gang
Published: January 2014

The influencing factors of the stability for the potassium ferrate (K2FeO4), including pH, alkalinity, O3, KI, KClO3, KCl, NaClO3and Na2SiO3, were studied in this work. The results showed that the K2FeO4stability in water is best at about pH=10. The higher the alkalinity is, the stronger of K2FeO4stability would be. The O3had no effect to improve the K2FeO4stability. The K2FeO4stability would be best in water with 15mmol/L NaClO3, 10mmol/L Na2SiO3and 9mol/L alkalinity. Under this condition, the K2FeO4content would be 83.28% after 24h.
Research on Production and Pyrophorisity of Iron Sulfur Compounds in Liquid Phase
Authors: Shang Li Yan , Zhao Shan Lin , Tian Yan Wen , Zhang Zhen Hua , Xie Shu Wang , Li Ping
Published: January 2014

The production and pyrophorisity of iron sulfur compounds in liquid phase were studied in order to get the spontaneous combustion rules of iron sulfur compounds producted by different ways. In the experiment, FeSO4·7H2O, FeCl2·4H2O, Fe (NO3) 3·9H2O react with (NH4)2Sx and Na2S·9H2O respectively,then the pyrophorisity were analyzed by the exothermic oxidation process of sulfuration productions. The results show that, the pyrophorisity of sulfuration productions formed from (NH4)2Sx and dissolvable iron salt is obviously higher than formed from Na2S and the same dissolvable iron salt. With the increase of dissolvable iron salt concentration, the oxidation pyrophorisity of sulfuration productions formed from (NH4)2Sx also increases. There is some pyrophorisity of sulfuration productions formed from Na2S and dissolvable iron salt. But the pyrophorisity is faint relatively.
Effective Hydrogenation of p-Chloronitrobenzene over Iridium Nanoparticles Entrapped in Aluminum Oxy-Hydroxide under Mild Conditions
Authors: Fan Guang Yin , Zhang Chun
Published: January 2014

The Ir/AlO(OH) catalyst was prepared by sol-gel method and used for selective hydrogenation of p-chloronitrobenzene (p-CNB) to p-chloroniamine (p-CAN). The mechanism of p-CNB hydrogenation over the catalyst was discussed. The hydrogen bond between the surface hydroxyl groups of the catalyst and the nitrogen present in p-CNB facilitated the hydrogenation of nitro group. On the other hand, the formation of hydrogen bond between the hydrogenation product and water promotes the rapid desorption of the hydrogenation product on the surface of the catalyst. Thus the activity and selectivity were greatly promoted.
Synthesis and Characterization of Metal Salen Complexes Immobilized MCM-41 and their Catalytic Activity for Benzyl Alcohol Oxidation
Authors: Huang De Xuan , Song Yi Bing , Fang Yi Wen , Sun Chang Yong
Published: January 2014

Co(Ⅱ)-, Mn(Ⅲ)- and Cu(Ⅱ)- salen type complexes were immobilized over mesoporous MCM-41 through coordinating the metal atom to amino groups covalently attached to the MCM-41 functionalized 3-aminopropyl triethoxysilane (3-APTES). The XRD patterns shown that mesostructure of MCM-41 remains intact after various modifications, while spectral techniques shown the successful anchoring the neat complexes inside MCM-41. The catalytic activity results shown that Co-salophen/MCM-41 exhibited the highest catalytic performance in the water phase selective oxidation of benzyl alcohol.
Recombinant Expression of Bioactive Peptides: A Review
Authors: Liang Rong , Zhang Mei Shuo , Lin Song Yi
Published: January 2014

There is a wide source of bioactive peptides and the preparation methods of it are various. It is a novel process that preparing bioactive peptides by genetic engineering. In this paper, the expression system of bioactive peptides is discussed and its research progress is introduced.
The Use of PEI in the Targeted Gene Delivery of VEGF165 and Ang-1
Authors: Ma Cai Li , Lv Lin Lin , Yang Wei Chao , Li Xiu Fang , Liu Yu , Yang Ji Cheng , Li Ming Zhong
Published: January 2014

Poly (ethyleneimine) (PEI) is utilized as the delivery vector for vascular endothelial growth factor (VEGF) 165-angiopoietin-1 (Ang-1) dual gene simultaneous expression plasmid. The influences of PEI/pDNA ratios on the packing effect, cytotoxicity and transfection efficiency are investigated. The result of agarose gel electrophoresis suggesst that pDNA are entrapped into PEI completely when N/P ratio exceeds 3/1. MTT assay demonstrates that the cell viability is over 90% when the PEI/pDNA (w/w) ratios is respectively 1/2, 2/2, 3/3, 4/2 or 5/2. The L929 cells are transfected with PEI/pDNA in vitro, the results show that the fluorescence intensity and transfection efficiency could reach their highest levels when the PEI/pDNA ratio is 3/2. In general, this study provides a novel method for future in vivo transfection investigations.
Glycoconjugation of 4-Methylumbelliferone via “Click Chemistry”
Authors: Yang Ru Chun , Hu Tao , Cao Ban Peng , Chen Xi , Xiao Qiang
Published: January 2014

A series of carbohydrate-conjugated 4-methylumbelliferone were synthesized using 1,3-dipolar cycloaddition “click chemistry” of the azide and alkyne. The reaction is straight forward and in high yield. The strategy will be useful for synthesizing glycoconjugated derivatives of natural products.
Chemical Constituents from Gentiana algida Pall
Authors: Yang Ai Mei , Men Yun , Han Han , Yang Lin , Shi Xiao Long , Wu Rui , Guo Wei Jie
Published: January 2014

Eight compounds were isolated from the ethanol extract of G. algida Pall. the structure of these compounds were identified as: oleic acid (1), linoleic acid (2), octacosanoic acid (3), β-sitosterol (4), 2,3-dihydroxybenzoic acid ethyl ester (5), n-butyl isobutyl phthalate (6), daucosterol (7), 5,8-dimethoxy furocoumarin (8). These structures were identified by NMR MS IR and other spectroscopic techniques. These compounds were isolated from this plant for the first time.
Analysis on the Main Problems of Industrial Application of the Regenerated Amine Desulphurization Technology
Authors: Zhou Deng Feng , Wu Yu Jiao , Guo Jian Bing , Lu Fang Hai
Published: January 2014

In this paper, generation and harm of SO2are described. Cansolv SO2Scrubbing, a regenerated amine process, is mainly described with respects to its process principle, features and application. This paper analyzed the existing problems such as corrosion , crystallization and loss of amine. Prevention measures were proposed according to the monitoring data, analysis and research.
The Synthesis of (1-oxaspiro[2.5]octan-2-ylmethoxy)(tert-Butyl) Dimethylsilane
Authors: Liu Dong Wang , Tang Lin Jun , Huang Fei Fei , Wang Li Ping , Wang Xiao Ji , Huang Shuang Ping
Published: January 2014

Venlafaxine (Fig. 1) is a new generation antidepressant drug. (1-oxaspiro [2.octan-2-ylmethoxy)(tert-butyl) dimethylsilane (11) as an important intermediate of (+) or (-) venlafaxine (1), was synthesized by four steps including an key epoxidation.
Facile Synthesis, Characterization and Anti-Inflammatory Effect of 3-Aminoindolizine Derivatives
Authors: Wei Yong , Cao Cheng Qiao , Lu Xiao Feng , Yang Zheng , Zou Kun , Huang Nian Yu
Published: January 2014

Four 3-aminoindolizines were synthesized from the substituted 2-bromopyridines and propargyl amines with the aim of obtaining potential anti-inflammatory compounds, which were characterized by NMR, IR, ESI-MS and elemental analysis. Their biological activities were evaluated by the bacterial lipopolysaccharide (LPS) stimulation of mouse cells in the RAW264.7 inflammation model. The target compounds4a-4drevealed moderate anti-inflammatory effects with the inhibitions of 45%~61% at 50 μM. The bioactive 3-aminoindolizines might be used for further optimization as potential anti-inflammatory drugs.
Evaluation of In Vitro Antibacterial Activity of Endophytic Fungus from Anemone tomentosa
Authors: Yang Lin , Long Jing , Li Wei Juan , Yang Ai Mei , Yang Zhong Duo , Liu Xiao Feng , Zou Rui Xue
Published: January 2014

In this study, 23 endophytic fungus were isolated from Anemone tomentosa. The antibacterial activity of the endophytic fungi were tested and analyzed by filter paper method. The results showed that the endophytic fungi from Anemone tomentosa had broad antibiogram and strong inhibited Gram-positive bacteria and Gram-negative bacteria, especially the mycelia extract of root-1, the ethyl acetate and the n-BuOH extracts of root-8. So the endophytic fungi from Anemone tomentosa could be an important resource for developing antimicrobial products.
Isolation of Endophytic Fungi from Ephedra intermedia and Research Antibacterial Activity of Secondary Metabolite Produced by the Fungi
Authors: Yang Lin , Li Wei Juan , Long Jing , Yang Ai Mei , Yang Zhong Duo , Liu Xiao Feng , Hua Dong , Wang Wen Juan , Ma Jun Hong
Published: January 2014

20 strains of endophytic fungi were isolated from roots and stems of Ephedra intermedia. After fermentation these strains, fermentation broth and mycelium were extracted by ethyl acetate, n-butanol and methyl alcohol, producing 60 extracts. Then the antibacterial activity of these extracts was researched, the result found that 33 extracted samples could evidently inhibit the growth of six different bacteria, accounted for 55%. The MIC of ethyl acetate extract of J109 was 0.15625mg/mL to five test bacterial expect Streptococcus uberi.
Determination of Vitamin and Aminophylline by a Method of PLS
Authors: Lei Yan Hong
Published: January 2014

This paper described a spectrophotometric method for simultaneous determination of two drugs,Vitamin C, aminophylline with the aid of partial least squares. The proposed method was successfully applied to overcome the overlapping of their absorption curves in the UV spectral region.The result was shown that the predictive errors obtained by the PLS method was 9.25%. Recovery of the method by standard addition method was respectively valued 92.43% (for vitamin C) and 102.53% (for aminophylline).
Well-Established Biodegradation Tests Used Biogenously Evolved Carbon Dioxide as an Analytical Parameter to Determine the Ultimate Biodegradability of Metalworking Fluids Measured by the Change of Absorption Solution Conductivity
Authors: Gerulova Kristina
Published: January 2014

Nowadays, there exist a few standardized tests in poor soluble substances ready biodegradability measurement. There are possibilities in evaluate the degradation by the O2 consumption or by CO2 releasing. Tests for O2 consumption are very stringent in keep the constant temperature because of the pressure which is the main parameter in O2 consumption calculating. On the other hand CO2 releasing test are complicated and discontinue because of the measuring by the titration methods. In present there is a possibility to measure CO2 produced by microbial activity during the substance degradation by the gaseous sensors. We were realized preliminary studies in continual measuring of evolved CO2 in biodegradability test of metalworking fluid Syntilo 81 BF by the conductivity measurement of absorption solution of barium hydroxide as it was described in [3,5].
Investigation on the Purification Efficiency of Rainwater by Green Land
Authors: Liu Zhi Yong , Xu Xiao Jun , Zheng Xin , Dai Wen Jiao
Published: January 2014

Rainwater utilization system using green technology, not only can reduce the pressure of rainstorm on the city drainage system, and replenish groundwater resources, but also control urban non-point source pollution. At present, rainwater indirect utilization is widely used. This research explored the Kunming urban green space system typical for each pollutant runoff reduction effect, purifying regularity and removal mechanism in order to provide a theoretical basis for its application.
Stereo-Controlled Total Synthesis of Ieodomycins A and B
Authors: Zhu Cheng Lin , Zhang Jian Ting , Chen Shi Peng , Feng Jun Min , Wang Gao Peng , Li Yu Ping , Huang Shuang Ping , Wang Xiao Ji
Published: January 2014

A highly convergent formal synthesis of Ieodomycins A and B was achieved in 7 steps. The key features involved in the synthetic sequence of Ieodomycins A and B are the Sharpless asymmetric epoxidation and the Mukaiyama aldol reaction[. The synthesis of C-3 epimer of Ieodomycins A and B was also accomplished in good yields, but now just Heptyl diene aldehyde was getted thought 4 steps. Use Geraniol as meterials to make the corresponding aldehyde (1) via Swern oxidation. Though epoxidation, Wittig reaction and HIO4oxidation to get the intermediate . Useing it though few steps, the target molecule can be getted.
Determination of Parathion in Water Sample Using Ionic Liquid Head Space Microextraction Followed by HPLC
Authors: Shi Ling , Zhou Bo , Xu Shi Juan , Huang Du Shu , Pan Qing Shan , Wu Na , Liu Wei
Published: January 2014

In this study, a simple and effective method for the determination of organic phosphorus in environmental water samples using ionic liquid (1-butyl-3-methyl-imidazolium hexafluorophosphate, BmimPF6) head space fiber liquid-phase microextraction combined with high-performance liquid chromatography (HPLC) has been developed. The effects on the extracting efficiency such as the pH of the sample solution, the concentration of NaCl, etc., were investigated. Under optimized conditions, the value of the extracting efficiency can reach 289 for parathion.
Preparation and Performance Research of the Environment-Friendly Corrosion and Scale Inhibitor
Authors: Chen Yan Min , Sun Cai Xia , Xu Hui Wu , Wu Jin Ying , Huang Chang Shan
Published: January 2014

A new non-phosphorus composite water treatment agent m (PASP) : m (PESA) : m (HPMA) : m (BTA) = 8:12:10:5 was developed from polyaspartic acid (PASP), polyepoxysuccinic acid (PESA), hydrolyzed polymaleic anhydride (HPMA) and benzotriazole (BTA). The performance of corrosion and scale inhibition were evaluated by rotary hanging-piece, electrochemical and bubble experiments. The corrosion testing piece was characterized by SEM. The results show that the new environment-friendly composite water treatment agent has good performance of corrosion and scale inhibition. Further dynamic simulated test also indicates that the water treatment agent meet the use demand of circulating cooling water.
Determination of Aromatic Amines in Wastewater by Dispersive Liquid-Liquid Microextraction Coupled to Capillary Gas Chromatography
Authors: Sun Jian Qi , Tang Ming , Dai Jun
Published: January 2014

A simple and reliable method combining dispersive liquid-liquid microextracion (DLLME) with gas chromatography (GC) using flame ionization detection (FID) was developed for the simultaneous determination of aniline (AL),o-toluidine (o-TLD),N,N-dimethylaniline (N,N-DAL),p-chloroaniline (p-CAL), andp-nitroaniline (p-NAL) in wastewater. For this purpose, dispersive liquid-liquid microextraction (DLLME) was applied as a sample preparation technique. The DLLME conditions such as the types and volume of extraction solvent, the types and volume of the disperser solvent, pH value and salt addition were studied and optimized. The method was linear in the ranges from 2.2×10-3to 100.0 μg·mL-1for aforementioned aromatic amines withR2≥ 0.9968. The DLLME procedure allowed efficient recovery of the investigated aromatic amines ranging between 82 % and 92 % with a relative standard deviation (RSD) ≤ 3.4 for actual wastewater samples spiked with 5, 10 and 20 μg·mL-1of aromatic amines, respectively. These results showed the potential of this technique for aromatic amines monitoring in wastewater samples. Furthermore, the investigated methods are simple, reproducible, and inexpensive.
Comprehensive Utilization of Red Mud Remaining in Alumina Production
Authors: He Ao Ping , Hu Zhi Liu , Cao De Guang , Zeng Jian Min , Wu Bo Lin , Wang Lin Jiang
Published: January 2014

Red mud is a solid waste which is generated in the process of alumina production and is of highly alkaline. Red mud has very complex compositions, but contains a variety of rare and valuable metals. In addition, its high alkalinity is a severe pollution to water, land, air and environment, which has been one of the main factors to affect the sustainable development of aluminum industry. The characterization of red mud, the extraction of valuable metals from red mud, the utilization of red mud in construction materials, environmental restoration materials and other fields are introduced in this paper.
Extraction of Valuable Metals from Red Mud
Authors: He Ao Ping , Hu Zhi Liu , Cao De Guang , Zeng Jian Min , Wu Bo Lin , Wang Lin Jiang
Published: January 2014

The reason of comprehensive utilization of red mud is that it contains recycled oxides and a variety of valuable metals. In this paper, the basic characterization of red mud is described. The current developments of extraction of Fe, Ti, Sc, rare earth and valuable metals from red mud are summarized with some emphasis. In addition, the technological features of each process route are analyzed briefly. It can be concluded that it is practiable to extract Fe, Ti, Sc, rare earth and valuable metals from red mud. However, in order to realize recycling of red mud, the key is that an economic, energy saving, environment friendly and widely applicable process has to be found.
Study on Extraction of Mg from Boron Mud
Authors: Wang Wei , Gu Hui Min , Zhai Yu Chun
Published: January 2014

Mg was extracted from boron mud through calcining method. The technological process is that the boron mud was calcined at 700 °C for 3 h then uniformly mixed with (NH4)2SO4in proportion and calcined. The reaction process was studied by TG-DTA and XRD, which is that MgO in calcined boron mud reacts with (NH4)2SO4to produce (NH4)2Mg2(SO4)3at low temperature, then with increasing the temperature, (NH4)2Mg2(SO4)3decomposes into MgSO4. The effects of calcination temperature, mol ratio of reaction substrates and calcination time on conversion rate of Mg were studied. The results indicate that the conversion rate of Mg increases with the increasing of calcination temperature first then decreases, increases with the increasing of calcination time and mol ratio of (NH4)2SO4and MgO. When the calcination temperature is 500 °C, the calcination time is 3 h, the mol ratio of (NH4)2SO4and MgO is 0.9:1, the conversion rate of Mg is 81.9 %.
Experiment and Numerical Simulation on Slugging Fluidization of Large Particles in Gas-Solid Fluidized Bed
Authors: Yang Hui , Wan Dong Yu , Cao Chang Qing
Published: January 2014

The hydrodynamics of a two-dimensional gas-solid fluidized bed with 0.03 m diameter and 0.3 m height were studied experimentally and computationally. The slugging fluidization of large particles was experimentally investigated and simulated using the Fluent 6.3 computational fluid dynamics (CFD) package. By a series of cold-model test, characterization of gas-solid fluidization with large particles was studied. These results can be used to research slugging characteristics. A multifluid Eulerian model incorporating the kinetic theory for solid particles was applied to simulate the unsteady-state behavior and momentum exchange coefficients were calculated by using the Syamlal-OBrien drag functions. These results of the transfer of fluidization state, maximum bed expansion ratio and pressure fluctuation were systemically simulated in a gas-solid fluidized bed. The modeling predictions compared reasonably well with experimental data and qualitative slugging regime. The simulation results can better predict the slugging fluidization characterization of large particles.
A New Modeling Approach to Estimate the Concentration of Tibolone in Acetone Solvent through Raman Spectra
Authors: Xiang Lei Lei , Sha Zuo Liang , Zhu Liang
Published: January 2014

Raman spectra are sensitive to solute, solid or polymorphs concentrations, particle size distribution and temperature. Characteristic peak positions of tibolone and acetone were observed at 1559cm-1 and 787cm-1. In this paper, we used the LabRAM HR800 System to detect the Raman spectra of 11 undersaturated standard solutions (concentration range 0-150 mg/ml) at 40°C; built model that estimating concentration of tibolone in acetone solvent by relating peak intensity ratio of the components to the concentration of the solution, and the mean estimated error was only 1.723% in the testing data. The results indicate that this method of estimating concentration is feasible and simple.