bluuebunny/crossref_metadata_2025 huggingface dataset:
The Influence of the Hydrothermal Temperature on the Morphologies and the Optical Absorption Properties of CuO Microrods
Authors: Sun Hu , Fu Xiao Ming
Published: May 2013

CuO microrods with a diameter range of 1-2 μm are successfully synthesized with 1 m mol CuCl2 as copper source and 1 m mol Na2CO3 as auxiliary salt at 240 °C for 24 h via the simple hydrothermal method. The phase, the morphologies and optical absorption properties of the samples have been characterized and analyzed by XRD (X-ray diffraction), SEM (Scanning electron microscope) and ultraviolet-visible absorption spectroscopy (UV-VIS), respectively. XRD analysis shows that the phase of as obtained samples is CuO. SEM analysis confirms that the increase of the reaction temperature is propitious to synthesize CuO microrods. And UV-VIS measurements show that CuO microrods have a good optical absorption property.
Characterization of Nd:Y3Al5O12 Thin Films Prepared by Electron Beam Evaporation Deposition
Authors: Ren Hao , Zeng Qun , Liang Xi Hui
Published: May 2013

Nd:YAG thin films have been prepared on Si (100) substrates by electron beam evaporation deposition. The surface morphologies, crystalline phases and optical properties of the Nd:YAG thin films were characterized by x-ray diffraction, scanning electron microscopy, photoluminescence spectroscopy, and spectrophotometer. The crystallization of Nd:YAG thin films was improved after annealing at 1100 °C for 1 hour in vacuum. Excited by a Ti:sapphire laser at 808 nm, photoluminescence spectra of Nd:YAG thin films were measured at room temperature, and the transition of4F3/24I11/2of Nd3+in YAG in the region of 1064 nm were detected by a liquid nitrogen cooled InGaAs detector array.
Advance in the Growth of Ordered Ge/Si Quantum Dots
Authors: Wang Hai Peng , Wang Chong , Yu Jie , Yang Jie , Yang Yu
Published: May 2013

Recent progress in the growth of ordered Ge/Si quantum dots (QDs) is reviewed. We focus on the detailed progresses of the Ge/Si multiple layers QDs and the preparation of Ge/Si QDs by ion beam irradiation. In addition, the growth of Ge/Si QDs on patterned substrate by using different preparation methods are also well discussed, such as nanosphere lithography technology, extreme ultra-violet interference lithography technology, nanoimprint lithography technology, etc.
Pyroelectric Properties of SBN/BST by Powder-Sol Method
Authors: Shan Lian Wei , Li Wei , Wang Ji Hua , Li Zhong , Dong Li Min
Published: May 2013

0.7BaO·0.3SrO·0.3Nb2O5·0.7TiO2 (SBN/BST) composite ceramics werefabricated using a Powder-Sol (P-S) method with Nb2O5fine powder suspended in the barium strontium titanate (abbreviated as BST) solsolution. By X-ray diffraction (XRD) investigations, it is found that thetetragonal tungsten bronze (TTB) phase and perovskite phase were co-present incompositions. The average grain size of BST and SBN phase is 140 nm and 2.2 μm,respectively. The room temperature relative dielectric constant is 1445 forthis sample measured at 1 kHz and zero bias. In the room temperature, thepyroelectric coefficient of the 0.7BaO·0.3SrO·0.3Nb2O5·0.7TiO2is 39 nc/cm2·°C. The maximum value of FDis about 2.4×10-5 Pa-1/2at 45°C.
Effects of Al2O3 Coating on the Structural and Electrochemical Performance of LiNi0.5Co0.2Mn0.3O2 Cathode Material
Authors: Cao Kun Jian , Wang Li , Li Lin Ci , Liang Guang Chuan
Published: May 2013

The pristine LiNi0.5Co0.2Mn0.3O2cathode material particles were successfully coated with Al2O3via a heterogeneous nucleation process and subsequent heat-treatment. The structure and electrochemical properties of Al2O3-coated LiNi0.5Co0.2Mn0.3O2were characterized by XRD and constant-current charge/discharge cycling tests. It was found that the Al2O3coating did not alter the crystal structure of the cathode material. The Al2O3coating layer had a negative influence on the dicharge specific capacity and a positive effect on the cycling performance. The decreased discharge capacity of the coated sample can be attributed to the poor clectronic and ionic conductivity of Al2O3layer, which interfered the Li+intercaltion/deintercaltion into/from the cathode material. The enhanced cycling performance can be ascribed to the suppression of the dissolution of transition metal ions by the HF acid in the eletrolyte and the side reations between electrode and electrolyte by the Al2O3coating layer. The 2wt.% Al2O3-coated sample exhibits the optimal overall electrochemical performance, with discharge specific capacities of 157.0, 137.1 mAh/g at 0.2C and 3C rate, and capacity cycling retention rates of 97.34, 93.53% after 20 & 50 cycles, respectively.
Effect on Inner Electrical Field Distributions of EHV Converter Transformer by Insulation Material Characteristics
Authors: Zhang Ping , Nie Xin Peng , Meng Jun Ping , Wang You Hua
Published: May 2013

In order to analyze inner electrical field distributions of EHV converter transformers windings end at valve side, a simulation circuit model of oil-paper combination insulations is established in this paper. Then ANSYS10.0 finite element method (FEM) is used to calculate the electrical field distributions under four different excited volatges, containing DC voltage, AC voltage, superimposed DC-AC voltage and polarity reversal (PR) voltage respectively. Simulation results show that when only under DC voltage, resistive electrical field distributions highly convergen on insulating cardboard whose resistivity is correspondingly big. While only under AC voltage, capactive electrical filed distributions highly centeralize on insulating oil whose dielectic capacity is correspondingly small. And under superimposed DC-AC voltage, its unformity lies in DC voltage or AC voltage function alone. While under transient polarity reversal volatge, its distrbutions present like tooth and electrical strength of insulating oil is bigger than that of insulating paper.
Study on the Preparation and Micro-Structural Characterization of SiC Nanowires Obtained by Direct Microwave Heating
Authors: Huang Shan , Wang Ji Gang , Liu Song , Zhang Yue Chen , Qian Liu , Liang Jie
Published: May 2013

SiC nanowires have been synthesized by microwave-vacuum heating method at 1480°C, using silicon powders, silica dioxide powders and artificial graphite as raw materials. SEM, TEM and XRD were employed to investigate the micro-structure of obtained specimens. It was shown that β-SiC can be directly synthesized directly without any catalyst on the basis of the vapor-solid (VS) growth mechanism. The obtained specimens exhibited various morphologies and sizes, due to the differences in the reaction temperatures and the distribution of components in the crucible. Products existed in upper crucible were bright-green and more pure, mainly consisting of nanorods with a diameter of about 150nm and some SiC micro-crystals. At the same time, the surface oxidation phenomenon was not obvious. As to the grey-green products existed in other zone, lots of SiC/SiO2 coaxial nanowires with a diameter around 20-50 nm (the thickness of SiO2 surface layer was about 2nm) were successfully obtained. Besides, there also remained some un-reacted graphite and silica dioxide. The excitation light with wavelength of 240nm was used to test the photoluminescence properties of the products. Results showed that both of the SiC nanorods and SiC/SiO2 coaxial nanowires exhibited a strong broad photoluminescence peak at wavelength of about 390nm, displaying a higher degree of blue-shift in comparison to the reported luminescence results of β-SiC nanomaterials.
Effect of VC, TaC and NbC Additions on Microstructure and Properties of Ultrafine WC-10%Co Cemented Carbides
Authors: Yu Hao , Li Wan Ni , Jiang Xian Quan , Jiao Peng He
Published: May 2013

The ultrafine WC-10%Co cemented carbides were prepared by vacuum sintering processing. To inhibit the growth of WC grains during sintering, single VC, TaC and NbC were used as inhibitors. Effects of VC, TaC and NbC as grain growth inhibitor on the microstructure and properties of ultrafine WC-10%Co cemented carbides were investigated with different kinds of testing methods. With the transformation of doped inhibitors content, the results show that VC, TaC and NbC additions can refine the WC grains, and increase the mechanical properties of the WC-10%Co cemented carbides, respectively. And the efficiency of these three kinds of inhibitors to limit gain size has been compared after sintering for 1.5h at 1 400 °C.
Synthesis and Structure Properties of Free-Standing TiO2 Nanotube Arrays
Authors: Chen Juan , Yang Chen Guang , Zhang Hong Wang , Zeng Hao , He Shu Li
Published: May 2013

TiO2 nanotube arrays were made on the titanium foil by the method of anodic oxidation. Large-area crystallized free-standing TiO2 nanotube arrays were fabricated by a two-step anodization, and then crystallized by different heat-treatment processes. The morphology and structure of the TiO2 nanotube arrays were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that the diameter of the TiO2 nanotube at the voltage range of 50V~65V was about 100nm. Anatase phase is the unique phase observed in free-standing TiO2 arrays annealed at the temperature of 400°C~610°C. However, crystallographic orientation of anatase phase is influenced by the annealing temperature.
Effects of Si on Structure and Properties of Mg-Sn Alloy
Authors: Geng Hao Ran , Liu Peng , Jiang Hua Wei , Teng Bo
Published: May 2013

Magnesium alloys are becoming ever more prevalent in automotive and aerospace industries as energy conservation and performance demands increase. However, it is limited on further application in the automotive field for its low strength compared with steel and aluminum alloys. Effects of Si addition on microstructure and mechanical properties of as-cast Mg-5%Sn magnesium alloy were also studied using SEM, XRD and tensile testing. The results show that the phases of as-cast alloy are composed of α-Mg, Mg2Sn; Mg2Si. The addition of Si suppresses the precipitation of the Mg2Sn, Product Chinese character shape phases of Mg2Si. With the increase of Si content, the effect becomes more apparent. When Si content is up to 1.25wt%, the grain refining effect reached best level. The average alloy grain size reduced from 90μm to 30μm, the tensile strength is the highest. The average tensile strength increased from 128 MPa to 156 MPa. When the Si added at 1.25wt% or less, the hardness and strength were improved with the increase of Si. When 1.25% Si was added, grain did not become further refinement. While Si content was continue to be increase, the tensile strength decreased.
Development on Preparation of Silicon Steel Strip by Near-Net Shape Technology
Authors: Zhang Feng Quan , Luo Zhong Han , Zeng Chun
Published: May 2013

In the paper, development and research on near-net shape technology is mainly introduced, including ultra-rapid quenching process for 6.5%Si high silicon steel strip and casting technology for thin silicon steel strip. The effects on fabrication property of the above products are analyzed and main processes are investigated. Preparation of silicon steel strip by near-net shape technology is prospected, too.
Thermoelectric Power of Carbon Fiber Reinforced Cement Composites Enhanced by Ca3Co4O9
Authors: Wei Jian , Hao Lei , He Ge Ping , Yang Chun Li
Published: May 2013

Micro-sized Ca3Co4O9powder was prepared by solid phase method at 850-950°C in air atmosphere. Seebeck effect of carbon fiber reinforced cement composites was enhanced efficiently by combining the Ca3Co4O9powder of 3.0wt.% by mass of cement. The absolute thermoelectric power achieves 1.65 fold increase and is up to 58.6μV/°C at room temperature. The lower activation energy of holes carriers and higher carrier concentration by doping Ca3Co4O9, are probably attributed to the increase of absolute thermoelectric power.
Advances in Microstructure of Sepiolite Mineral Nanofibers
Authors: Wang Fei , Feng Lei , Tang Meng Ran , Li Ji Yuan , Tang Qing Guo
Published: May 2013

Sepiolite mineral nanofibers are typical porous materials widely existing in nature and have many nanometer level micropore and mesopore, which could play an active role in many fields such as thermal insulation functional additive for composite materials. Based on the above reason, this paper briefly summarized the research progress of microstructure of sepiolite mineral nanofibers, and research orientations related to microstructure of sepiolite mineral nanofibers were also proposed.
Effect of Annealing Temperature on Oxygen Precipitation in Fast Neutron Irradiated CZ-Si
Authors: Ma Qiao Yun , Li Zhan Kai
Published: May 2013

The effect of annealing temperature on oxygen precipitation was investigated in various dose fast neutron irradiated Czochralski silicon (CZ-Si). Fourier Transform Infrared Absorption Spectrometer (FTIR) was used to measure the concentration of interstitial oxygen ([Oi]). Bulk microdefects (BMDs) were observed by optical microscope. The behavior of oxygen precipitation depends on the annealing temperature and the concentration of irradiation-induced defects. The mount of oxygen precipitates of irradiated samples is more than that in non-irradiation samples and increases with increasing the irradiation dose. Because of the effect of temperature on critical radius rcand the oxygen diffusivity, oxygen precipitation increase with the increase of temperature at the studied lower temperature range, while decrease with the increase of temperature at the studied higher temperature range. High density dislocation and stacking faults generate in irradiated sample.
Study on Hot Stamping and Usibor 1500P
Authors: Yao Yu , Meng Jun Ping , Ma Li Ye , Zhao Guo Qi , Wang Li Ran
Published: May 2013

Nowadays, automobile industry is under the pressure of market requirements of lightweight and energy-efficient. In order to follow the trend, automobile manufacturers have made their unremitting efforts in diverse aspects of materials research and development, designing and manufacturing. This thesis has explored the hot aspect, mechanical aspect, microscopic structure and the latest status of technical domain of hot stamping. The analysis is made on the main technology of hot stamping forming and its working process, and the application of hot stamping technology on automobile and advantages of this technology are expounded, respectively. This thesis has made a systematic introduction on the core technology of hot stamping and its pros and cons through testing the coating hot stamping steel plates, and pointed out the current status of its application as well as its future prospect.
Depositing of Amorphous Ferri-Oxide Nanoparticles on Surfaces of Submicron Aluminum Powder
Authors: Wang Yi , Jiang Wei , Song Xiao Lan , Deng Guo Dong , Li Feng Sheng
Published: May 2013

Nanoparticles with about 20nm diameter were densely coated on the surface of submicron Al via a sol-gel processing in ethanol, wherein 1,2-epoxypropane acted as a weak base to consume proton in solution. After the medium gelled, uniform network formed and aluminum particles imbedded in it. The core-shell structure and the nanoparticles were observed in SEM analysis. The EDS spectrum and the XRD pattern revealed that the cores consisted of amorphous ferri-oxide of which the mass ratio is closed to that of crystal Fe2O3. Thermal analysis was performed and the results indicated that the DSC peak point of ferri-oxide/Al nanocomposite showed 53 °C lower than that of [ferri-oxide+A simple mixture.
Study on the Performance of CPVC/PMMA Blends
Authors: Liu Ze Peng , Cui Yong Yan
Published: May 2013

Effects of PMMA resin on the mechanical properties and processability of CPVC/PMMA(Chlorinated polyvinyl chloride/polymethyl methacrylate) blends were studied in this paper. The results showed, the impact strength of CPVC/PMMA blends were improved, the heat distortion temperature and tensile strength didn't reduce significantly when the content of PMMA was set to 15 phr, the melt viscosity decreased as the content of PMMA increased in the blends, and the surface gloss were improved. The miscibility of CPVC/PMMA blends in which the content of PMMA was set to 15 phr were studied. The microscopic structure of two-phase was also showed in the SEM micrographs.
Preparation and Superparamagnetic Properties of Graphene/Fe3O4 Nanocomposite
Authors: Zhao Dong Lin , Bai Li Zhong , Li Xiao , Zhang Dong Dong
Published: May 2013

The superparamagnetic graphene/Fe3O4nanocomposite has been successfully prepared via an easy and scalable chemical precipitation method. High quality graphene sheets were prepared from natural flake graphite by oxidation, rapid expansion and ultrasonic treatment. The structure of graphene and graphene/Fe3O4nanocomposite was investigated by transmission electron microscopy, Xray diffraction and Fourier transform infrared spectroscopy. The graphene sheets possess a curled morphology consisting of a thin wrinkled paper-like structure. The graphene/Fe3O4nanocomposite exhibits a superparamagnetic behavior, its specific saturation magnetization,Msis 38.92 emu g-1.
Preparation and Performance of Andalusite Bonded SiC Solar Heat-Absorbing Ceramics
Authors: Wu Jian Feng , Liu Meng , Xu Xiao Hong , Zhang Ya Xiang , Li Kun , Yi Guo Xia
Published: May 2013

Using andalusite, SiC, Su Zhou Kaolin and Guang Xi quartz as materials, andalusite bonded SiC heat absorbing ceramic was prepared by pressureless firing in the ceramic preparation process. The influence of gradient SiC on microstructure and properties of the samples were studied. Using the testing technology of XRD, SEM, and etc., physical and chemical properties, phase composition and microstructure were tested and analysised.The results indicate that andalusite bonded SiC heat absorbing ceramic, which prepared to have a low firing shrinkage rate, high refractoriness and a good microstructure. The best firing temperature of the best formula C4 is 1460°C, firing expansion rate is 0.98%, bending strength is 32.52MPa,porosity is 30.74%, bulk density is 2.05g·cm-3, refractoriness is 1650°C,growth rate of oxidation weight is 2.769mg·cm-2and have no crack after 30 times thermal shock. The bending strength has increased 11.15% after thermal shock. XRD analysis indicated that the main phase compositions are α-SiC, mullite and cristobalite.SEM studies show that there are many connected pores in the samples, the diameters of the pores are 10~20μm. Andalusite bonded SiC heat absorbing ceramic have a low firing expansion rate, high bending strength and good microstructure, which is suit for tower type solar thermal power generation.
Intracellular Trafficking Characteristics for Magnetic Layered Double Hydroxide/DNA Hybrids to Human Gastric Cancer Cells
Authors: Sun Yue , Gou Guo Jing , Dong Li E
Published: May 2013

We report here the intracellular trafficking characteristics of a gene delivery system composed by magnetic layered double hydroxide/DNA (MLDH/DNA) hybrids to human gastric cancer cells (SGC-7901). Perls Staining of MLDH/DNA was done to examine the intracellular iron uptake and accumulation; confocal microscopy and transmission electron microscopy were evaluated the cellular internalization feature of the MLDH/DNA system. We have indicated that the MLDH/DNA hybrids are able to enter into the nucleus within 2 h of incubation, displaying a prospect for application in targeted gene delivery.
Hydroxyapatite Crystals Grown on Ti MAO Film by Hydrothermal Treatment
Authors: Ma Feng Cang , Liu Ping , Chen Yin , Li Wei , Liu Xin Kuan , Chen Xiao Hong , He Dai Hua
Published: May 2013

Hydroxyapatite crystals of various morphologies were grown on Ti-6Al-4V plates using Micro-arc oxidation (MAO) plus hydrothermal treatment. Phase identification was carried out by XRD. The mechanisms by which these HA crystals form is here discussed. It was deduced that HA formation depended on the degree of supersaturation of Ca and P ions in the treated solution. Various hydrothermal treatments with different degrees of supersaturation were designed and performed. Crystals with flake, needle-like, hexagonal column, and composite morphologies were obtained. The formation of different HA morphologies is discussed in terms of growth mechanisms. The effects of the degree of supersaturation of Ca and P ions on the morphologies of hydroxyapatite crystals are illustrated.
Conductivity Method of Alkaline Solution in Evaluating the Spontaneous Polarization Property of Tourmaline
Authors: Meng Jun Ping , Liu Jie , Huo Xiao Li , Li Juan
Published: May 2013

The spontaneous polarization property of mineral tourmaline was evaluated by the conductivity method of alkaline solution. The conductivity changing rate of the alkaline solution (k) was adopted as the evaluation index. In this paper, the deionized water and alkaline solution were treated by mineral tourmaline powders, respectively. Their conductivity values were tested by a Digital Conductivity Meter. On this basis, the conductivity difference was achieved. The results showed that, the changing rate k increased as the spontaneous polarization property. When 0<k2, the spontaneous polarization was weak; when 210, the spontaneous polarization was strongest.Key words: Tourmaline, Spontaneous polarization, Alkaline solution, Conductivity, Evaluation
The Nanostructure and Properties of the Nano TiO2/PVA Composite Film
Authors: Hong Wei , Li Qing Shan , Sun Jing , Wang Xin Chun , Wang Guo Wei , Xing Guang Zhong
Published: May 2013

In order to improve the performance of polyvinyl alcohol (PVA), the nanometer TiO2/PVA composite film prepared by solution casting, effects of nanotitanium dioxide (TiO2) PVA film. The structures, mechanical properties, and optical properties of the composite films were detected by infrared spectroscopy, TG, DSC, XRD. The results show that: nanoTiO2 fill added to the PVA matrix to improve the mechanical properties of PVA, thermal stability and UV shielding performance.
The Two-Step Process for the Production of Anion Acrylic Fiber
Authors: Sun Jing , Li Qing Shan , Hong Wei , Zhan Biao , Wang Guo Wei , Xing Guang Zhong
Published: May 2013

This article describes the preparation process of the anion acrylic and its test. In this study, using natural mineral nanomaterials prepared anion additives, using a two-step prepared anion acrylic fiber. Has been tested, the anion acrylic the indicators are good, the anion release can reach 1430 anions / cm3, and can be widely used in clothing, textile, medical and other fields.
The Research on the Adsorbing Behavior of Chitosan for Heavy Metal Ions
Authors: Liao Xiao Ling , Liu Yan , Huang Qiu Hong , Xu Wen Feng
Published: May 2013

Chitosan and N,O-carboxymethyl chitosan are non-toxic natural absorbents. In this paper, the adsorbing behavior of Chitosan and O, N-carboxymethyl Chitosan for Co2+ respectively were studied. The result indicated that the adsorbing ability of N,O-carboxymethyl chitosan was better than this of chitosan. The adsorbing ratio increased clearly with the increasing in the pH value of solution and absorbent amount, but it was not sensitive to the concentration of Co2+. Within ten minutes, the adsorbing ratio of above absorbents could achieve above 80%. But with time prolonging, the adsorbing ratio increased slowly. When time was more than 15 minutes and the pH value was higher than 10, the adsorption rate slowly flatted out.
High Catalytic Activity and Stability of Hexaaluminate Catalysts for N2O Decomposition
Authors: Zhang Chao , Song Yong Ji , Shi Feng Hua , Li Cui Qing , Wang Hong
Published: May 2013

In this paper, hexaaluminate oxides LaMAl12O19-σwere prepared by using M=Cu ,Ce and Zn as active components to substitute Al in the hexaaluminate lattice by co-precipitation method. The structure and properties of LaMAl11O19-σcatalyst was characterized with XRD and BET. The results showed LaCuAl11O19-σexhibited significant high catalytic activity for the decomposition reaction of N2O. Under the simulated in situ condition, LaCuAl11O19-σalso indicated significant catalytic activity and stability, with N2O conversion of 90% at 635°C.
Synthesis and Properties of Ni-Doping Nano-TiO2 Photocatalysts
Authors: Luo Yu Ping , Zhang Jin , Zhu Zhong Qi , Liu Qiang , Liu Qing Ju
Published: May 2013

Ni-doping TiO2 photocatalysts were synthesized by sol-gel method and characterized by XRD, Size Distribution and PL instruments. Meanwhile, the degradation of methyl blue (MB) was investigated under fluorescent lamp to test the photocatalytic activity of the samples with different Ni-doping concentration and sintered at different temperature. The results show that the photocatalytic activity of TiO2 photocatalysts is much higher than that of Degussa P25. The optimum preparation parameters are that the pH value is 2.5, Ni: Ti=0.01 (molar ratio) and sintering temperature is 500°C.
Research Progress of Quantum Dot Solar Cell
Authors: Cui Wei , Wang Chong , Yang Yu
Published: May 2013

The solar energy is the most promising energy to solve energy crisis and environmental problem. Quantum dot can be applied to solar cells in two structures of QDSC to improve the energy conversion efficiency. The two structures are p-i-n type QDSC and quantum dots sensitized solar cells. The energy conversion efficiency of p-i-n type QDSC may increase up to 45%. Both CdSe and CdS quantum dot can be used as the sensitizer of the QDSSC and each of them has its demerits and merits, but the conversion efficiency of QDSSC is low if they were used respectively. Thus, in order to overcome their demerits respectively, we could try to combine their merits. QDSC is the most promising technique to solve the problems of solar cell. But before large-scale application their efficiency and stability should be improved.
Applications and Development of Soft Materials in DC/DC Converter Modules
Authors: Du Cheng Hu , Dong Sheng Yu , Sun Jiang Ping
Published: May 2013

DC/DC converter modules have been used in military and civil industrials on a large scale. This paper mainly elaborates the application scope and characteristics of soft materials, which are used in DC/DC converter modules, and the effect of core type and integrating method on converter modules were researched. The development trend is pointed out combining with the technology of DC/DC converter modules.
Research of the Ancient Sea Rock-The Natural Mineral Enzyme Function Water
Authors: Liu Ming Cheng , Li Qing Shan , Wang Pei Jing , Guan Long Long , Hong Wei
Published: May 2013

In this paper, the micro-nanopowder of ancient Sea rock was used as core material to filter tap water. With this method, the healthy-drinking water has been prepared successfully with the property of weak alkaline, small molecule clusters, rich of trace elements contributing to health. Its properties were characterized by high-resolution superconducting NMR spectrometer, inductively-coupled plasma spectrometer, far infrared radiation rate tester, pH acidity meter and redox potential instrument. The results showed that the pH value of this water was 7.2~7.8, and the region of ORP was 124mV; FWHM of 17O-NMR spectrum was 56.39Hz, It is a kind of water with small molecules; It also contains a variety of macro and micro elements which human needed; The filtered water is beneficial to human health and longevity with a good immune function.
Keywords: Ancient Sea rock, Function water, Health, Longevity;
Measuring Air Anion Concentration and Evaluating Tourism Gravity of Beidaihe
Authors: Li Qing Shan , Zhou Jing , Zhou De Hai , Hong Wei , Zhang Cheng Bo
Published: May 2013

In this paper, air Anion and its functions such as cleaning air, resisting bacteria and health care are introduced. Beidaihe where is located at sea and near Beijing is a famous place for people to live and travel.Through measuring air Anion concentration of Beidaihe and comparing the result to the seven evaluation criteria system of the air anions concentration, we can see that the air in Beidaihe is very fresh, it helps to health and is fit for some eco-tourism activities. Coming to a conclusion that Beidaihe is the best city to travel and keep healthy.
Synthesis of Hollow Titania Photocatalytic Particles Using Yeast as Templates
Authors: Nomura Toshiyuki , Tanii Syota , Tokumoto Hayato , Konishi Yasuhiro
Published: May 2013

Hollow inorganic particles have attracted considerable interest for a variety of applications. In this work, yeast powder was used as a bio-template to fabricate yeast/titania core-shell spheres. A titania precursor was deposited via the hydrolysis of tetraisopropyl titanate. Triethanolamine was employed to control the reaction rate of the sol-gel process. The hollow titania particles with a diameter of approximately 4 m and a thickness of approximately 54 nm were successfully obtained after calcination of the core-shell spheres at 700 °C. The crystal structure of the particles was anatase. The specific surface area and the average pore diameter were 21.4 m2/g and 1.6 nm, respectively. The photocatalytic activity of the hollow particles was higher compared with that of solid particles.
Combustion Synthesis of Nanomaterials
Authors: Mansurov Zulkhair
Published: May 2013

An experimental study has been conducted in premixed and counterflow diffusion flames in order to obtain the nanocarbon materials. The original results in the field of synthesis of fullerenes, carbon nanotubes, syperhydrophobic soot,grapheme and nickel oxide nanoparticles in hydrocarbon flames were carried out for the last years at the Institute of Combustion Problems. Nanoparticles of nickel oxides contribute to the efficient absorption of light energy. Surfacing on the surface of a silicon solar cell of led to an increase in solar cell efficiency by 3%.
Preparation of Self Curable Unsaturated Polyester with Pendant Hydroxyl Groups and Investigation of its Curing Properties
Authors: Meng Jin Huan , Li Hai Yan , Chen Yi Yu
Published: May 2013

Self curable unsaturated polyesters with pendant hydroxyl groups on main chain were synthesized through the polycondensation of maleic anhydride and glycidol at different raw material ratios. The preparation process and self-curing properties were studied. Investigation demonstrated that the unsaturated polyester resin could be self cured through the addition reaction of pendant hydroxyl groups with the double bonds on main chain when it was heated above 150°C without additional cross-linking monomer. This research may contribute to improve air pollution caused by volatile of cross-linking monomers. H-nuclear magnetic resonance (1H-NMR) and Fourier transform infrared spectroscopy (FT-IR) were used to characterize.
Characterization of Fluorinated Multi-Walled and Single-Walled Carbon Nanotubes Using High Resolution XPS and EDX
Authors: Sun Ling Zhi , Zhang Xu
Published: May 2013

Pristine and fluorinated multi-walled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes (SWCNTs) were characterized using energy dispersive X-ray spectra (EDX) and X-ray photoelectron spectroscopy (XPS), respectively. The fluorine percentages of fluorinated multi-walled carbon nanotubes (F-MWCNTs) and fluorinated single-walled carbon nanotubes (F-SWCNTs) were 10.42% and 9.67% respectively by EDX. The absorption and de-absorption of fluorine properties were studied using high resolution C 1s and F 1s core level XPS and valence band spectra. The fluorine can be completely dissociated from F-MWCNTs, but partially dissociated from SWCNTs. There was 5.79% fluorine in atomic percent remaining associated with the F-SWCNTs when annealing the nanotubes to 500 °C measured by EDX. The results of F 1s core level XPS indicated that the binding energy of fluorine associated on SWCNTs was shifted from 687.0 eV to 688.3 eV after annealing the nanotubes to 500 °C. The results of valence band spectra showed that the binding energy of F 2p and F 2s shifted from 7.5 eV and 31.0 eV to 8.8 eV and 32.5 eV respectively in SWCNTS. However, the two peaks disappeared in annealed MWCNTs.
Synthesis of Nimetazepam - Molecularly Imprinted Polymer and SPE Application
Authors: Sun Ling Zhi , Sun Cheng Jun , Fang Yong Qin , Sun Xian Xiang
Published: May 2013

The synthesis and performance of a molecularly imprinted polymer (MIP) designed to enable the clean-up of the interferences existing in alprazolam (Alpra) drug samples is described. The MIP was synthesized using non-covalent molecularly imprinted method. Nimetazepam (Nimet), which has a similar chemical structure as the major impurities in Alpra drug samples, was used as the dummy template. Methacrylic acid was used as the monomer. Both the affinity and selectivity of the MIP for Nimet and structurally related compounds were examined through batch-rebinding studies. The specific binding amount of Nimet was determined to be 11.4 mg•g-1. The MIP was used as the sorbent in solid phase extraction (MI-SPE) and methanol was used as the washing solvent for the clean-up of Nimet in the Alpra complex samples. The effective clean-up of Nimet was achieved, with a recovery > 90% for Alpra, in the stimulated samples.
Electrical Conductivity of Nanodimensional Polyaniline Particles in Nanoporous Dielectric Matrix of MIL-101
Authors: Romanenko A.I. , Dybtsev D.N. , Fedin V.P. , Aliev S.B. , Anikeeva O.B. , Tkachev E.N.
Published: May 2013

We investigated an electrical conductivity of aniline polymerized inside nanopores of chromium terephthalate dielectric matrix MIL-101. We found that temperature dependences of conductivity (T) are described by the fluctuation-induced tunneling model, which means that the main contribution to a net conductivity is caused by contacts between particles of the polyaniline. We also found that the nanoporous matrix affects the composite conductivity via the size reduction of the conducting polyaniline phase encapsulated in the pores. Dependence of conductivity from a current was thoroughly investigated. This dependence is resulted from a reduction of energy gap for current carriers which is, in turn, induced by an increasing electric field applied.
Role of the Organic Matrix in the Biopolymer-Mediated Synthesis of Platelike YBCO
Authors: Zhang Zi Li , Wimbush Stuart C. , Kursumovic Ahmed , Suo Hong Li , MacManus Driscoll Judith L.
Published: May 2013

The biomimetic method of achieving dense platelike grain growth of the high temperature superconducting ceramic YBa2Cu3O7 (YBCO) has been studied. By using various organic matrices (dextran and chitosan) having different molecular structures, the final size and arrangement of the platelike YBCO grains exhibit significant differences, possible reasons for which are discussed. The different organic matrices used also indirectly affect the superconducting properties of the YBCO formed. By elucidating the role of the organic matrix in the biomimetic synthesis process in this way, the whole process could be controlled more precisely, leading to structural and electrical properties of the final product more desireable for specific applications.
Micro-Flocculation - Film Processing Technology in Dealing with Beer Sterilized Wastewater
Authors: Fu Jin Xiang , Liu Hui , Zhang Rong Xin
Published: May 2013

In order to improve beer sterilization effect of wastewater treatment, reduce the heat load of the sterilization wastewater on subsequent water treatment processes. In this paper, through optimizing transformation developed micro-flocculation -membrane treatment processes. Screening for the identification of inorganic polymeric aluminum ferric chloride flocculants as the technology. The best dosage was 15mg / L, the field test to verify the craft beer sterilized wastewater treatment effect. The results show that, micro flocculation membrane treatment process in the water after treatment of COD and turbidity removal rate is respectively 76% and 98%. To illustrate the use of this technology in the treatment of beer sterilizing water without two stage filtration, can effectively recycling sterilized wastewater.
Biological Nutrient Removal and EPS Performance in Aerobic-MBR and SBR-MBR Systems
Authors: Feng Xiao Nan , Tao Tao , Xi Hao , Xu Yong Tao , Wang Hong Feng , Dong Qiong Yuan , Yuan Peng , Yang Guo Hong , Li Chen Sheng
Published: May 2013

.Membrane bioreactor (MBR) is considered to be a promising technology for combine biological with filtration and many advantages over conventional activated sludge (CAS) processes. In this study, the submerged membrane bioreactor which was explored by our research group and JDL Environmental Protection Ltd. at condition of aerobic-MBR and SBR-MBR were investigated. Hydraulic characteristics of MBR by the tracer experiments showed the total dead space (Vd, %) in the MBR was 3.2%. Compared with aerobic-MBR situation, the SBR-MBR exhibited better performance of average NH4+-N, total nitrogen, and phosphorus removal efficiency 90%, 86%, 57% respectively. The content of protein was correlated to sludge activity and organic matter. The initial membrane fouling was caused by layer pollution and subsequently the extra-cellular polymeric substances (EPS) contributed.
Antibacterial Activity of Brewer's Spent Grains Peptides to Staphylococcus aureus
Authors: Li Li , Zong Xu Yan , Zhang Jing , Wei Chun Hui , Huang Zhi Guo , Luo Hui Bo
Published: May 2013

Antibacterial ability of brewer's spent grains peptides was detected which were hydrolyzed in different hydrolysis time with four proteases. The results showed: Flavourzyme hydrolyze in 180 min has better antibacterial ability to Staphylococcus aureus. The hydrolyzate was separated with polyamide column chromatography, ion exchange column chromatography, respectively. Peptides were tested of antibacterial ability, and better antibacterial ability were collected. Molecular weight is about 1877.67 which is measured with gel column chromatography. The minimal inhibitory concentration to Staphylococcus aureus was 2%.
Preliminary Study for the Allelopathic Effect of Water Extracts from Solidago canadensis Leaves
Authors: Li Shu Lin , Li Zhao Hui , Wang Ya Fei , Ruan Xiao , Pan Cun De , Wang Qiang
Published: May 2013

The allelopathy of the exotic invasive plant, Solidago canadensis L. was studied. S. canadensis leaves were extracted with water and partitioned against ethyl acetate and n-butanol sequentially. The two organic fractions, original water extract and the residual water after the organic solvent extraction were tested for inhibitory activity on seed germination and seedling growth of wheat (Triticum aestivum), setaria (Setaria viridis) and its own species. Germination rate, vigor and index were recorded as germination parameters, and radicle and plumule growth and fresh weight of seedlings were recorded as seedling growth parameters. Results showed that the water extracts of S. Canadensis leaves had significant impacts on the seed germination and seedling growth of the three tested plants. n-Butanol fraction showed the strongest allelopathic effect, while the residual water after the organic solvent extraction had no significant phytotoxic effect compared with the control. n-Butanol fraction at 0.5 mg•ml-1 could significantly inhibited the seed germination of the same species, and that at 5 mg•ml-1 could significantly inhibited the seedling growth of the same species. n-Butanol fraction at 1.5 mg•ml-1 could significantly inhibited the seed germination and seedling growth of wheat. n-Butanol fraction at 5 mg•ml-1 could significantly inhibited the seed germination and seedling growth of setaria. The allelochemicals were mainly contained in n-butanol fraction of water extracts from S. canadensis leaves.
Effect of High Repetition Pulsed Laser Annealing on Optical Properties of Phosphorus Ion-Implanted ZnO Nanorods
Authors: Shimogaki Tetsuya , Ofuji Taihei , Tetsuyama Norihiro , Okazaki Kota , Higashihata Mitsuhiro , Nakamura Daisuke , Ikenoue Hiroshi , Asano Tanemasa , Okada Tatsuo
Published: May 2013

We report on the effect of high repetition pulsed laser annealing with a KrF excimer laser on the optical properties of phosphorus ion-implanted ZnO nanorods. The recovery levels of phosphorus ion-implanted ZnO nanorods have been measured by photoluminescence spectra and cathode luminescence (CL) images. After ion implantation on the surface of ZnO nanorods, CL was disappeared over 400 nm below the surface due to the damage caused by ion implantation. When the annealing was performed at a low repetition, CL was recovered only shallow area below the surface. The depth of the annealed area was increased with the repetition rate of the annealing laser. By optimizing the annealing conditions such as the repetition rate, the irradiation fluence and so on, we have succeeded to anneal the whole damaged area over 400 nm in depth and to observe CL. Thus, the effectiveness of high repetition pulsed laser annealing on phosphorus ion-implanted ZnO nanorods was demonstrated.
Conductivity of Composite Material Based on System NdPo4•nH2O- CsH2PO4
Authors: Anfimova Tatiana , Bjerrum Niels J. , Li Qing Feng
Published: May 2013

The goal of the present study was to obtain a comprehensive knowledge about synthesis conditions, structure, thermal behavior and conductivity properties of neodymiumorthophosphates in order to analyzeof use this material in intermediate temperature fuel cells due to their thermal and chemical stability properties.The impedance spectroscopy technique (IS) was used to measure the conductivity. The conductivity of compositesobserved to be lower than conductivity of pure CsH2PO4 but had improvedsufficiently conductivity of pure NdPO4•nH2O.
Characterization, Optical and Impedance Study of ZnSe Nanostructure
Authors: Tripathi Ramna , Kumar Akhilesh
Published: May 2013

Zinc selenide nanoparticle has been synthesized using soft chemical routes. The particles were capped using 2-mercaptoethanol to achieve the stability and avoid the coalescence. The as-obtained particles were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), UV–VIS absorption and photoluminescence (PL) spectra. The impedance studies were carried out as a function of frequency (100 Hz–1 MHz) and temperature (298–373 K) by impedance spectroscopy. An analysis of the complex impedance (z' and z") with frequency is performed assuming a distribution of relaxation times.
Effect of Carbon Fiber Filament on Electrical and Mechanical Properties of Epoxy/Graphite Composite
Authors: Lee Jae Young , Choi Bum Choul , Lee Woo Kum , Choi Il Yub , Shim Joong Pyo , Lee Hong Ki
Published: May 2013

Epoxy/graphite powder (GP)/carbon fiber filament (CFF) composites have been prepared in various weight ratios and electrical and mechanical properties were estimated in order to use for the bipolar plate in PEMFC. As was expected, electrical conductivity increased with increasing total carbon content, and the value increased with increasing CFF content in the same carbon content. Tensile strength and flexural strength linearly decreased with increasing epoxy content, however in the same carbon content, these values increased with increasing CFF content. The good effect of CFF on the electrical and mechanical properties was due to the strong bonding between CFF and epoxy resin, which was confirmed by scanning electron microscopy (SEM).
Fabrication of a Large-Scale Conductive Composite Film Containing Electrically Aligned Carbon Nanotubes
Authors: Kitamura Yu , Tone Hiroaki , Nakano Michihiko , Suehiro Junya
Published: May 2013

Application of high electric field is effective for the alignment of carbon nanotubes (CNTs) in a nanocomposite film. The conventionally used one pair of parallel plate electrode is not applicable to large-sized nanocomposite fabrication due to limited output voltage of high voltage source. We have proposed a new method using parallel array electrode system to prepare large-scale conductive composite film containing aligned CNTs. In the electrode system, the electric field generated by an array of interdigitated parallel wire electrodes was applied to the CNTs by using an electric field averaging scheme. The array electrode system made a large-scale (15 × 15 cm2) composite film containing uniformly aligned CNTs. In this study, we investigated the relationship between weight fraction of the CNTs and electrical conductivity of the composite film. Measurement of the surface electric potential of the composite film after corona discharge exposure revealed that the film with an electrical conductivity increased by electric field-induced CNTs alignment could serve as an antistatic film.
Hydration Process of Portland Cement Blended with Silica Fume
Authors: Ukrainczyk Neven , Zlopasa Jure , Koenders Eduard
Published: May 2013

The enormous carbon footprint associated with the global cement production (5-7%) asks for a radical change in the use of sustainable replacement materials in concrete. Replacement of cement by pozzolanic waste materials, being a by-product from industrial processes, has been widely recognized as the most promising route towards sustainable construction materials. This paper presents experimental study on hydration of commercial Portland cement blended with silica fume in replacement ratio of 15 mass %. Isothermal calorimetry was employed to monitor the hydration kinetics. Thermogravimetric analysis coupled by differential scanning calorimeter (TG/DSC) was used to investigate the formed hydration products at 1, 3, 7, and 28 days of hydration. Two different approaches for a dispersion of silica fume in cement paste were compared: ultrasound bath and addition of superplasticizer (polycarboxylic ether based).
Studies on Temperature Variation and Angular Distortion in Submerged Arc Welded Butt Joint
Authors: Hitesh Arora , Singh Prince Pal , Hooda Ajay
Published: May 2013

Large structures are usually made by joining different elements. Fusion welding is one of the most fundamental technique, which is used to make large metallic joints. During fusion welding a large amount of heat is generated which melts the joint surroundings and a joint is created after solidification. Joint configuration is mostly affected by the material parameters and process type. In this paper, a thermo-mechanical simulation of fusion welding of submerged arc welding is performed using ANSYS. A moving heat source model based on Double-Ellipsoidal heat flux distribution is modelled. The transient temperature distributions and temperature variations of the welded plates are calculated during welding process. Effect of welding speed, welding current on temperature profile and angular distortion of plates is further investigated.
Photocatalytic Splitting of Water on Cu-TiO2 Nanotubes
Authors: Simamora Anggiat Jogi , Hsiung T.L. , Wang H. Paul , Liao C.Y.
Published: May 2013

By XRD, UV-Vis, and X-ray absorption spectroscopy, it seems that copper is inserted in the framework of TiO2 nanotube (Cu-TNT), which was prepared for photocatalytic splitting of H2O. The Cu-TNT has light absorption extended into the visible range (400-550 nm) and decreased the band gap to 2.95 eV. Under UV/Vis light irradiation for six hours, H2 yielded from photocatalytic splitting of H2O on the Cu-TNT is greater than that on the TNT by 2-3 times.
Development and Antimicrobial Properties of a Composite Sorbent from Carbonized Rice Husk and Fugate of Sporogenous Bacteria
Authors: Savitskaya I.S. , Zhubanova A.A. , Mansurov Z.A. , Kistaubayev A.S. , Akimbekov N.S. , Dauletbayeva S.K. , Bolekbayeva A.B.
Published: May 2013

A new composite sorbent based on carbonized rice husk (CRH) and immobilized on it inactivated cultural liquid containing antimicrobials of Bacillus subtilis CK-245 is developed. The sorption and antimicrobic activity of CRH concerning five species of Enterobacteriaceae is studied. Prospects of use of developed sorbent in medicine and veterinary science is shown.
The Structure Activity Relationship and Cytotoxicity between Stemonal and 6-Deoxyclitoriacetal
Authors: Pangkam Nattapong , Chimsook Thitiphan
Published: May 2013

Stemonal and 6-deoxyclitoriacetal, rotenoid compounds were isolated from the dried roots of Stemona collinsae Craib. Stemonal was recrystallized with methanol. Crystal structure of stemonal displayed only the planar structures while that of 6-deoxyclitoriacetal showed both the planar and bent shape structures. Stemonal and 6-deoxyclitoriacetal were tested their cytotoxic activities against three cancer cell lines and found that only 6-deoxyclitoriacetal has been showed the cytotoxicity.