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M. Eshraghi,P. Kameli 한국물리학회 2011 Current Applied Physics Vol.11 No.3
We developed a simple synthesis method for production of CoFe_2O_4 nanoparticles. The method is based on the solid state ball-milling and calcinations of acetate precursors and citric acid. The samples were characterized using X-ray diffraction, transmission electron microscope, Fourier transform infrared and energy-dispersive X-ray spectroscopy. Magnetic properties of the samples were studied using vibrating sample magnetometer and ac susceptibility measurements. The results show that the products mainly consist of CoFe_2O_4 nanoparticles. Magnetization measurements demonstrate the effect of calcination temperature on particle size and hence, on the magnetic properties of the CoFe_2O_4 nanoparticles. By increasing the particle size from 3.5 to 7.2 nm, the room temperature coercivity and magnetization increase from 0 to 152 Oe and from 8 to 30 emu/g respectively. Also, the low temperature calcinated samples, C250 and C30 are superparamagnetic in nature due to it’s near-zero coercivity and remanence. We estimated the mean value of the effective anisotropy constant, K_eff = 9.2 × 10^6 erg/cm^3. This value is much larger than the bulk value, due to the surface effects.
A. Ghotbi Varzaneh,P. Kameli,V. R. Zahedi,F. Karimzadeh,H. Salamati 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.4
In this paper, an attempt has been made to synthesis of the nanostructured Ni47Mn40Sn13 ferromagnetic shape memory alloy by ball milling of Ni, Mn and Sn powder mixture. The structure and magnetic evaluation of samples were investigated by X-ray diffraction, transmission electron microscopy, differential scanning calorimetry and AC susceptibility measurements. The results showed that after 20 hours of ball milling, the nanostructured L21-Ni47Mn40Sn13 powder was formed with an average particle size of 5 nm. In the as-milled specimen, the martensitic transformation (MT) was not observed. This was basically due to the atomic disordering and large lattice strain in nanoparticles. However, the annealing of milled specimens at temperatures above 1023K for 16 hours led to the occurrence of MT in nanostructured Ni47Mn40Sn13 powders. We also calculated t-he activation energy of MT by using Kissinger method and it was estimated to be about 52 kJ mol-1. The results demonstrate that a combination of MA and subsequent heat treatment has the potential to produce Ni-Mn- Sn magnetic shape memory.
Strongly interacting superspins in Fe3O4 nanoparticles
B. Aslibeiki,P. Kameli,I. Manouchehri,H. Salamati 한국물리학회 2012 Current Applied Physics Vol.12 No.3
In this paper we report structural and magnetic properties of Fe3O4 nanoparticles synthesized by thermal decomposition of ball milled iron nitrate and citric acid in N2 and air ambient. The XRD pattern of samples which are prepared in air shows some impurity phases, while the samples synthesized in the N2atmosphere are almost pure Fe3O4 phase. The result shows that by increasing the particle size, the magnetization of the samples increases. The increase of magnetization by increasing the particle size could be attributed to the lower surface spin canting and surface spin disorder of the larger magnetic nanoparticles. The results of ac magnetic susceptibility measurements show that the susceptibility data are not in accordance with the Néel -Brown model for superparamagnetic relaxation, but fit well with conventional critical slowing down model which indicates that the dipole-dipole interactions are strong enough to cause superspin-glass like phase in these samples.
Pullout capacity of vertical plate anchors in cohesion-less soil
Kame, G.S.,Dewaikar, D.M.,Choudhury, Deepankar Techno-Press 2012 Geomechanics & engineering Vol.4 No.2
In this paper, the ultimate pullout capacity of a vertical plate strip anchors in cohesion-less soil is analyzed with the consideration of active and passive state of equilibrium in the soil. K$\ddot{o}$tter's equation is used to compute the active and passive thrusts (along with their point of application) which are subsequently used in the analysis in which, all the equation of equilibrium are properly interpreted. A comparison of the results with the experimental results vis-$\grave{a}$-vis available theoretical/empirical solutions shows that, the proposed analysis provides a better estimate of the pullout capacity.
Workplace Relationships and Employee Engagement: Domestic Workers vs. Expatriates
김영희,Kaming Queena Cheung,김민중 Academy of Asian Business (AAB) 2017 Academy of Asian Business Review Vol.3 No.1
Increasing employee engagement is a critical issue for a firm’s human resource management, and thus, for firm performance. Given the importance of the topic, existing research has found several determinants of employee engagement. However, there are few insights on the engagement of expatriates residing in a developing market such as an Asia market. In this study, we identify workplace relationships (i.e., relationship with co-workers, supervisor, and organization) are the key determinants of employee engagement based on our literature review. Using survey responses from 318 employees working in service companies in Hong Kong, we empirically confirm that the three relationship variables positively affect employee engagement. Furthermore, we divide the sample into domestic workers and expatriates, and examine whether the effect is stronger for expatriates by doing sub-sample tests. We find that those social workplace relationships are more effective in increasing engagement of expatriates than that of domestic workers. With the findings, we provide important and interesting implications to researchers and business practitioners especially taking in charge of human resource management.
Guidelines for Human Interface Design of Rescue Robots
Yasuyoshi Yokokohji,Takashi Tubouchi,Akichika Tanaka,Tomoaki Yoshida,Eiji Koyangi,Fumitoshi Matsuno,Shigeo Hirose,Hiroyuki Kuwahara,Fumiaki Takemura,Takao Ino,Kensuk Takita,Naoji Shiroma,Tetsushi Kame 제어로봇시스템학회 2006 제어로봇시스템학회 국제학술대회 논문집 Vol.2006 No.10