Volume-dependent total energies of Al, Li, and various intermetallic Al-Li compounds have been calculated by the first-principles full-potential linearized augmented-plane-wave (FLAPW) method. These values used to calculate phase diagrams according cluster variation method in tetrahedron approximation. Methods for performing lattice-parameter optimization including relaxation effects are presented. Truly first-principles-based solid phases computed without any fitting parameters or empirical...

A potentially useful high-temperature intermetallic compound ${\mathrm{Ti}}_{3}$Al is investigated theoretically by the self-consistent linear muffin-tin orbitals (LMTO) and full-potential linearized augmented-plane-wave (FLAPW) methods within local-density approximation. Structural properties were calculated for naturally observed structure, D${0}_{19}$, two other similar structures, D${0}_{22}$ L${1}_{2}$. The LMTO-calculated Wigner-Seitz radii are 2.98 a.u. all three in excellent...

Two main problems, including unbalanced grid input and circuit parameters uncertainty in the three-phase soft-switching converter control system, are considered this paper. First, constant-switching-frequency model-predictive (CF-MPC) is improved for application compound active-clamp zero-voltage-switching power factor correction converter. Second, a robust-constant-frequency (RCF-MPC) method proposed current loop; novel contributions are: 1) negative-sequence component introduced into cost...

With the increase in number of stroke patients, there is a growing demand for rehabilitation training. Robot-assisted training expected to play crucial role meeting this demand. To ensure safety and comfort patients during training, it important have patient-cooperative compliant control system robots. In order enhance motion compliance hierarchical adaptive strategy that includes patient-passive exercise proposed. A low-level backstepping position controller selected accurate tracking...

This paper investigates the ontological multiplicity of digital heritage objects within context a twin project focused on Yunyan Temple, Sichuan Province, China—a site threatened by natural disasters. The employs laser scanning and photogrammetry to generate high-resolution 3D models at varying levels detail. study analyzes how these support diverse analytical tasks ranging from geomorphological analysis structural assessments spatial sequence analysis. We present novel four-layer data...

The power electronic converters are typical nonlinear systems. conventional linearized modeling methods cannot accurately describe the working process of converter. control strategies based on model can only achieve good performance near point. By considering switching system nature converters, main contributions this article as follows: a current error is developed for three-phase voltage source rectifiers (VSRs) under unbalanced grid first time; and an improved stability analysis theorem...

Precise results of first-principles electronic-structure calculations the structural and electronic properties binary compound LiAl are presented for bcc-based B32 B2 crystal structures, fcc-based L${1}_{0}$ simple-cubic-based B1 structures as obtained with full-potential linearized augmented-plane-wave method. Particular care was taken to ensure convergence total energy a function inherent numerical parameters in order obtain precise absolute energies possible. Our corroborate findings...

The all-electron local-density full-potential linearized augmented-plane-wave method was applied to calculate the total energy and electronic structure of several Li-rich Al-Li compounds including ${\mathrm{Al}}_{2}$${\mathrm{Li}}_{3}$, ${\mathrm{Al}}_{4}$${\mathrm{Li}}_{9}$, ${\mathrm{AlLi}}_{3}$ (with L${1}_{2}$ ${\mathrm{D}0}_{3}$ structure). ground-state properties are found be in good agreement with available experimental data. Based on calculated heats formation, both...

We demonstrate holographic reconstruction using low-energy electron-diffraction (LEED) and positron-diffraction (LEPD) intensity spectra. Calculated LEED LEPD spectra from a multiple-scattering method are inverted to produce high-fidelity images of near-neighbor atoms whose positions measured an adatom. show that positron diffraction is better suited for because scattering in solids weaker than electrons.

The cohesive and electronic properties the structural stability of ${\mathrm{Al}}_{3}$Li in its fcc-based L${1}_{2}$ bcc-based D${0}_{3}$ structures are investigated with use first-principles all-electron full-potential linear augmented-plane-wave (FLAPW) method. Particular care was taken to ensure convergence total energy as a function inherent numerical parameters order obtain high precision. To further understand calculated stability, structure some superstructures (notably...

A combined statistical-mechanical and electronic-structure approach for the first-principles calculation of binary-alloy phase diagrams is presented. The grand partition function, constructed from volume-dependent internal energies obtained local-density total-energy supercell calculations, permits determination entropy thus, in principle, all thermodynamic quantities. Illustrative results first calculations Al-Li system show: (i) structural properties versus concentration very good...

The compound active-clamp zero-voltage switching three-phase power factor correction (PFC) converter is used as the first stage of heating supply in monocrystalline silicon growth furnace to achieve high efficiency and factor. Parameter uncertainty variation are main problems for controller design converter. conventional methods, including proportional-integral (PI) control, exact feedback linearization (EFL) etc., cannot deal with such problems. In this paper, we propose a model reference...

Background: Pneumatic muscle actuator (PMA) actuated multisection continuum arms are widely applied in various fields with high flexibility and bionic properties. Nonetheless, their kinematic modeling control strategy proves to be extremely challenging tasks. Methods: The relationship expression between the deformation parameters length of PMA geometric method is obtained under assumption piecewise constant curvature. Then, model established based on improved D-H method. Considering...

The observation of spin-dependent photoelectron diffraction using circularly polarized x rays is reported for Fe films on Cu(001). Circularly produce spin-polarized photoelectrons from the 2p doublet, and intensity asymmetries in 2${\mathit{p}}_{3/2}$ level are observed. Fully spin-specific multiple-scattering calculations reproduce experimentally determined energy angular dependences. An analytical procedure introduced which removes exchange shift contributions to asymmetry, focuses instead...

This study proposes a novel double closed-loop robust control strategy based on power switching affine model of three-phase voltage source converters (VSCs). The aim is to overcome the challenges posed by inaccurate mathematical models, complex controller configurations, indirect control, and performance degradation under circuit parameters uncertainty or load variation in conventional methods. These methods rely linearization duty ratio regulation, pulse width modulation (PWM) technologies....

In the process of fracture reduction, there are some errors between actual trajectory and ideal due to mechanism errors, which would affect smooth operation reduction. To this end, based on self-developed parallel reduction robot (FRR), a novel method reduce pose FRR is proposed.Firstly, paper analyzed built model errors. Secondly, were converted into drive bar parameter's influence each parameter error analyzed. Thirdly, combining with Cauchy opposition-based learning differential evolution...