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Magnets with nominal compositions of (Nd1−xCex)30FebalCu0.1B1(x= 0, 0. 15, 0.3 and 0.4, mass%) have been fabricated by blending powder method. The remanence (Br), intrinsic coercivity (Hc) and maximum energy product (BH)maxof the RE2F14B type magnets deteriorated when Nd was replaced by Ce. The chemical composition and crystal structure of magnet were investigated systemically. Backscattered electron (BSE) and energy dispersive spectroscopy (EDS) results revealed that Ce-rich and Ce-lcan matrix grains coexisted in the magnets. The magnetic coupling mechanism among the double hard magnetic phases was discussed. Low melting point RE-Cu phase was in favor of the formation of uniform continuous grain boundary. Transmission electron microscopy (TEM) investigation showed the presence of fcc (Nd,Ce)Oxphase in the grain boundary. When the Ce content was 15% of the total amounts of all the rare earth, the maximum energy product of the sintered magnet was 359. 8 kJ/m3.

Magnets with nominal compositions of (Nd1-xCex)30FebalCu0.1B1(x= 0, 0.15, 0.3 and 0.4, mass %) have been fabricated by blending powder method. The remanence (Br), intrinsic coercivity (Hc) and maximum energy product (BH)maxof the RE2Fe14B type magnets deteriorated when Nd was replaced by Ce. The chemical composition and crystal structure of magnet were investigated systemically. Backscattered electron (BSE) and energy dispersive spectroscopy (EDS) results revealed that Ce-rich and Ce-lean matrix grains coexisted in the magnets. The magnetic coupling mechanism among the double hard magnetic phases was discussed. Low melting point RE-Cu phase was in favor of the formation of uniform continuous grain boundary. Transmission electron microscopy (TEM) investigation showed the presence of fcc (Nd, Ce)Oxphase in the grain boundary. When the Ce content was 15% of the total amounts of all the rare earth, the maximum energy product of the sintered magnet was 359.8 kJ/m3.

We designed the H-shaped metamaterial which is used at terahertz frequencies, and it can suppress magnetic response and construct purely electrical resonance. The resonance behaviors and the impact of geometrical parameters of the H-shaped metamaterial were analyzed by using effective circuit model. The simulation results indicate that permittivity of H-shaped metamaterial is negative at terahertz frequencies. H-shaped metamaterial could be used widely in the design of terahertz devices due to its simple structure and easy manufacture.

In this paper, an Ultra-wide-band (UWB) filter based on composite right/left handed transmission line (CRLH TL) is presented. The structure of the proposed band-pass filter is quite simple, of which the size is 0.5cm×1.5cm. Left-handed capacitor is obtained by couple of microstrip lines, and Left-handed inductance is obtained by the grounded stub. The simulated results indicate that the pass band of UWB filter is 3.4-11GHz, the insertion loss is less than 1 dB and the return loss is smaller than -12.5dB. The performance of UWB filter could meet the requirement of UWB communication systems.

Abstract: A novel ruthenium(II) complex [Ru(bpy)2DMHPIP] (DMHPIP = 2-(3,5-dimethoxy-4-hydroxyphenyl)imidazo[4,5-f][1,10]phenanthroline) (1) has been synthesized and characterized by elemental analysis, 1H-NMR and ESI-MS. The DNA binding properties of the complex has also been investigated by electronic spectra and emission spectra, and the results show that complex (1) bind to DNA with high affinity. On the other hand, the photocleavage property of complex (1) on liver cancer cells lines Bel-7402 DNA has been investigated by electrophoresis agarose gels, and the results show that the complex can promote liver cancer cells Bel-7402 DNA from the supercoiled form to the nicked form excellently.

Application of amorphous alloy in highly efficient and power dense motors is increasingly being adopted, helping to solve global warming and energy-saving problems. Compared with conventional silicon steel materials, amorphous alloy shows faster flux reversal, lower magnetic loss and more versatile property modification, which result in the possible application in power electronics, telecommunication equipment, electronic article surveillance systems in the future. Some fundamental problems associated with materials processing and device fabrication technology remain to be further improved.