The layout design of communication satellite is a complex iterative process, which involves all subsystems and products. As the top-level work design, affects performances whole satellite. to place given in one (or more) limited structure space according certain geometric functional restrictions, result needs meet conditions each constraint. This paper will be oriented module, comb process elements. presents constraint condition quantitatively studies construction digital model design....

In the present work, structure, magnetic, and dielectric characteristics of Nd2NiMnO6 Sm2NiMnO6 have been investigated with comparison to those for La2NiMnO6. The magnetic properties ceramics vary decreasing lanthanide ionic radius (RLn). Both are ferromagnetism monoclinic symmetry (space group P21/n). Curie temperature TC is 194 K 156 K, respectively, it decreases 〈Ni-O-Mn〉 bond angle which depends on RLn. Meanwhile, constant ε′ monotonically similar variation tendency RLn indicates that...

In the present work, effects of Ti-substitution for Mn upon structure, magnetic and dielectric properties in La2NiMnO6 ceramics have been investigated. strongly affects crystallographic, magnetic, double perovskite ceramics. Refinements x-ray diffraction data show that all compositions investigated here monoclinic structure space group P21/n with a partially ordered arrangement Ni Mn/Ti cations. The nature x up to 0.8 is ferromagnetic (FM), while antiferromagnetic La2NiTiO6. Curie...

In this work, the slow evaporation method of room temperature was used to grow an ultraviolet (UV) transparent nonlinear optical (NLO) crystal Li2.9Cs1.1(SO4)2 (LCSO). It crystallizes in space group Pmc21. The energy band gap measured be 5.39 eV, and demonstrates a moderate second-harmonic generation response (0.8 × KDP). Fundamental building units are tetrahedron [SO4]2– groups structure. theoretical calculations were performed illustrate relationship between electronic structure associated...

The structure and dielectric properties of Sm 1.5 Sr 0.5 Ni 1− x Al O 4 ( = 0.3, 0.5) ceramics were presented. A single orthorhombic phase was obtained in 0.7 0.3 ceramics, while minor impurities existed ceramics. Temperature stable giant response observed these two only one relaxation found. After comparing the activation energies electrical conduction, should be attributed to adiabatic small polaronic hopping process, behaviour samples with different aluminium contents confirmed...

(Sm1−xNdx)1.5Sr0.5NiO4 solid solution ceramics with K2NiF4-type structure have been synthesized in the entire range of 0.2 ≤ x 0.8. All compositions can form single orthorhombic phase a space group Bmab (64). With increasing x, crystal has tendency transforming from to tetragonal phase, and this transformation should be related average radius ions K-site. The relationships between low temperature dielectric relaxations adiabatic small polaronic hopping processes all are confirmed. Because...

Configuration and transport properties of zigzag graphyne nanoribbon (n = 2) are investigated by means the first-principles calculations non-equilibrium Green's function in this work. We demonstrated controllability graphyne's conductivity gate bias, tunneling behavior induced drain voltages was systemically. The characteristics Id-Vd, Id-Vg, as well evolutions current with electron temperature elevation were explored. device exhibits a ratio around 103, state art operations field effect...

Employing first-principles calculations, structural, electronic properties of new multiferroic material Er2NiMnO6/La2NiMnO6 perovskite superlattice are investigated. This structure is computed as monoclinic phase with obvious distortion. The average in-plane anti-phase rotation angle, out-of-plane in-phase angle and other microscopic features reported in this paper. Ni Mn found that stay high spin states. These play important roles properties. Based on these features, the relationship...

The dielectric and magnetic properties of Sr ( Fe 1/2 Ta ) O 3 complex perovskite ceramics were systematically investigated together with the structure. X ‐ray powder diffraction analysis confirmed a B ‐site disordered orthorhombic structure in space group Pbnm . Only one broadened peak strong frequency dispersion was observed present ceramics, which significantly different from that for analogue Ba Nb dependence sample thickness electrode material indicated relaxation behavior at lower due...

Uniaxial tension and polarization evolution under cyclic electric field are investigated for poly(vinylidene fluoride-trifluorethylene-chlorofluoroethylene) terpolymer films prepared by different annealing conditions. The stress-strain behavior of the film exhibits that polymeric elastomers, with its fracture strain reaching 680%. Structure analysis demonstrates polymer chains undergo reorientation, conformational change from nonpolar to polar phase takes place during uniaxial tension. Under...

To more in depth understand the doping effects of oxygen on SiGe alloys, both micro-structure and properties O-doped (including: bulk, (001) surface, (110) surface) are calculated by DFT + U method present work. The results as follows. (i) surface is main exposing SiGe, which O impurity prefers to occupy vacancy sites. (ii) For interstitial existences energy states caused band gap not only enhance infrared light absorption, but also improve behaviors photo-generated carriers. (iii) finding...

Abstract Counterweight will increase with the use of more and load equipment. More counterweights in satellite reduce weight percentage equipment, consume fuel short lifetime on orbit. Firstly, this paper analyzes relative factors counterweight, relationships between them. That is, counterweight designed centroid from layout, error product computational error, installation scheme 490N engine, as well disturbance torque value. Then way to is approached.