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Effect of deep cryogenic treatment on the formation of nano-sized carbides and the wear behavior of D2 tool steel

International Journal of Minerals,Metallurgy and Materials 2012年第9期19卷 795-799页

作者： Kamran Amini Amin Akhbarizadeh sirus javadpour Department of Materials Science and Engineering Majlesi Branch Islamic Azad University Isfahan 86315/111 Iran Department of Materials Science and Engineering School of Engineering Shiraz University Zand Ave. Shiraz *** Fars Iran

The effect of deep cryogenic treatment on the microstructure, hardness, and wear behavior of D2 tool steel was studied by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, X-ray diffraction （XRD）, hardness test, pin-on-disk wear test, and the reciprocating pin-on-fiat wear test. The results show that deep cryogenic treatment eliminates retained austenite, makes a better carbide distribution, and increases the carbide content. Furthermore, some new nano-sized carbides form during the deep cryogenic treatment, thereby increasing the hardness and improving the wear behavior of the samples.

关键词： cryogenic treatment tool steel nano-sized carbides wear resistance hardness austenite

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Frequencies Rotation at High Sound Pressure Levels Toward Low Frequencies

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Sound & Vibration 2020年第4期54卷 237-246页

作者： Hadi Negahdari sirus javadpour Faramarz Moattar Department of Environmental Engineering Faculty of Natural Resources and EnvironmentScience and Research BranchIslamic Azad UniversityTehranIran Materials Science and Engineering Department School of EngineeringShiraz UniversityShirazIran

Today,analyzing of sound pressure level and frequency is considered as an important index in human *** experts believe that analyzing of these parameters can help us to better understanding of work *** measurements and frequency analysis did to fix the harmful frequency in all sections in Shiraz gas power plant with sound analyzer model BSWA *** sound pressure levels(LP)and the one and one-third octave band were continuously measured in A and C weighting networks and slow mode for time *** 2013 and Minitab 18.1 software used for statistical *** analyzed by Minitab 18.1 *** highest harmful frequency in Shiraz Gas Power Plant(SGPP)was 50 Hz with 115 *** sound pressure level(SPL)ranged from 45 dB to 120 dB in one-third octave band and weighting network *** maximum sound pressure level was in Craft electricity generator with 105.3 dB and 67 *** pressure level in surrounded environment was 120 *** to the results,in this industry the sound pressure level exceeded the Occupational Exposure Level of Iran(OEL).The value of sound pressure level were higher than the Standard of occupational *** consumes 47000 cubic meters of natural gas per hour to produce 100 MW(Mega Watt)of *** is very high and it is not economical and cost *** numbers indicate that the power plant’s efficiency is *** could be concluded that the noise pollution is an important issue in these ***,SGPP produce noise with loss *** rotation at high sound pressure levels toward low frequencies were happened.

关键词： Sound waves noise-induced occupational safety industrial health noise

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Citrate capped superparamagnetic iron oxide nanoparticles used for hyperthermia therapy

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Journal of Biomedical Science and Engineering 2012年第12期5卷 715-719页

作者： Elham Cheraghipour sirus javadpour Ali Reza Mehdizadeh Department of Materials Science and Engineering Shiraz University Shiraz Iran Department of Medical Physics Shiraz University of Medical Sciences Shiraz Iran

Superparamagnetic magnetite nanoparticles (MNP) of about 10 nm were designed with proper physico-chemical characteristics by an economic, biocompatible chemical coprecipitation of Fe2+ and Fe3+ in an ammonia solution, for hyperthermia applications. Synthetic methodology has been developed to get a well dispersed and homogeneous aqueous suspension of MNPs. Citric acid was used to stabilize the magnetite particle suspension, it was anchored on the surface of freshly prepared MNPs by direct addition method. Carboxylic acid terminal group not only render the particles more water dispersible but also provides a site for further surface modification. The naked MNPs are often insufficient for their stability, hydrophilicity and further functionalization. To overcome these limitations, citric acid was conjugated on the surface of the MNPs. The microstructure and morphology of the nanoparticles were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), and the interaction between citric acid and MNPs were characterized by Fourier transform infrared spectroscopy (FTIR), whereas the magnetic properties were investigated by vibrating sample magnetometry (VSM). Magnetic measurement revealed that the saturation magnetization of the nanoparticles was 74 emu/g and the nanoparticles were superparamagnetic at room temperature. We also have analyzed the potential of these particles for hyperthermia by determination of the specific absorption rate, the temperature increase (ΔT) of the particles was 37oC. These ferrofluids with high self-heating capacity are a promising candidate for cancer hyperthermia treatment.

关键词： Magnetite Nanoparticle Citric Acid Hyperthermia

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