The critical issue in laser-induced breakdown spectroscopy (LIBS) research is the uncertainty of spectral signal and insufficient quantitative analysis accuracy. Spectral enhancement methods, such as discharge assistance plasma...

The simplified local density approach (SLD) is extended to the Elliott−Suresh−Donohue (ESD) equation of state for modeling gas adsorption on activated carbon, providing significant improvement in quantitative compared SLD using Peng−Robinson or van der Waals equation. Compared and equations, ESD more accurately represents temperature dependence adsorption.

Hybrid airships, combining aerodynamic lift and buoyant lift, are efficient near-space aircraft for scientific exploration, observation, surveillance. Compared to conventional airplanes hybrid airships offer unique advantages, including stationary hovering rapid deployment. Due the different task requirements strong coupling between flight environment, trajectory-optimization methods traditional difficult apply directly. We propose a model based on variational method calculate optimal time...

We compared the clinical effects of minimally invasive percutaneous pedicle screws osteosynthesis (MIPPSO) and open surgery on repair thoracolumbar vertebra fracture. Seventy patients, who suffered from fracture received treatment at our hospital, were selected randomly divided into either group (MIPPSO group) traditional (TOPSO with 35 cases in each group. The perioperative parameters including length incision, duration operation, bleeding during hospital stay, changes pre-operative...

A three-dimensional (3-D) printed conformal polarization converter, based on a novel dielectric unit cell, is proposed for linear-to-circular conversion. The designed cell comprises cuboid-shaped block and thin square substrate layer ease of fabrication with 3-D printing technology. Meanwhile, the can achieve conversion performance from 14.2 to 20.1 GHz 3 dB axial ratios 34% good angular stability within 40°. Then, applied design converters cylindrical spherical surfaces, respectively. To...

The investigation of the failure envelope control moment gyroscopes (CMGs) under simulated dynamic and thermal vacuum conditions on ground is crucial for ensuring reliability CMGs. In this study, a test rig employed to simulate combined stresses in environment, including temperature, CMG gimbal rotating speed, satellite speed. objective obtain high-fidelity running status data CMG. particle swarm optimization BP neural network (PSO-BP) model utilized learn from these subsequently predict...

The development of modern basketball has improved the ability to compete, and competition is becoming increasingly intense. Both in attack defense, they are more active fiercer. Therefore, higher requirements have been put forward for physical fitness players. If good cannot be guaranteed, various sports skills will become very difficult. In actual training basketball, specialized players received widespread attention regarded as main purpose way develop basketball. status role education...

The erosion effects of atomic oxygen (AO) in different incidence direction on carbon nanotube (CNT) arrays have been studied by ground‐based AO simulation facility. surface morphologies and the molecular structures CNT before after experiments characterized scanning electron microscopy Raman spectroscopy. It is shown that are quite from those experiments. presented both bombardment effect oxidation will contribute to arrays. Carbon be etched away environment, but yield with direction....

Based on the equivalent circuit model and physical model, a new method for analyzing diode electrical characteristics based neural network is proposed in this paper. Although widely used, it cannot effectively reflect working state of circuits under conditions large injection high frequency. The analysis models developed recent years can resolve above shortcomings, but faces problem low simulation efficiency. Therefore, acceleration used to improve traditional, model. results obtained from...

In this paper, a balanced-to-balanced filtering directional coupler (FDC) that can realize 3 dB coupling degree with high isolation and directivity is proposed. The design of the proposed FDC primarily based on microstrip/slotline transition structures, resonance odd–even mode phase velocity compensation structures. A U-type microstrip feed line integrated stepped-impedance slotline resonator adopted at input output ports, which makes differential-mode (DM) responses independent common-mode...

Polymer-matrixed materials are widely used in the spacecrafts' structures. However, crafts located LEO（Low Earth Orbit） would suffer from hazardous environment factors when orbiting space. It has been reported that space factors' integral effect (which represents factual detriment space) is not equivalent to simple summation of each individual. Hence, atomic oxygen and thermal cycling were selected as starting point for studying typical LEO synergistic effects on polymer-matrixed material....

Accurate wind speed measurement in low-pressure conditions is crucial for the thermal performance validation and attitude control of stratospheric aircraft. As air density decreases, traditional systems based on principles such as dynamic pressure, heat transfer, ultrasound, particle velocimetry face significant challenges when applied environments, often failing to achieve required accuracy. This paper presents development a simulation system rotation method designed operate conditions,...

Magnetic shape memory alloy-based actuators (MSMA-BAs) have extensive applications in the field of micro-nano positioning technology. However, complex hysteresis seriously affects its performance. To describe MSMA-BA, this study proposes integrating a operator and rate-of-change function input signal into least squares support vector machine (LS-SVM) framework to construct rate-dependent dynamic model for MSMA-BAs. The converts multi-valued mapping one-to-one mapping, while captures rate...

This paper first derives the second-order approximation of force and moment based on definition added mass stability derivatives. Further, it establishes a small perturbation model for high-altitude hybrid airships. Subsequently, typical airship’s parameters derivatives are calculated using computational fluid dynamics method. Based calculation results dynamic model, linear system analysis theory is applied to calculate compare eigenvalues state matrix step response with effect. The indicate...

ABSTRACT The high air-tightness multicore fiber optic penetration connect or is a core component for the optical sensing and communication technologies applied in space environment simulator under th e vacuum thermal environment. High insertion loss are two key indexes of connector. on-line synchronous detection method was proposed. First, established hardware-in-the-loop testing platform by using pumping system, vessel, helium mass spectrometer leak detector time-domain reflectmeter, then,...

A 3D printed conformal metasurface, based on a novel dielectric unit cell, is proposed for linear-to-circular polarization conversion. The designed cell comprises cuboid-shaped block and thin square substrate layer ease of fabrication with printing technology. Meanwhile, the can achieve conversion performance from 14.2 GHz to 20.1 3-dB axial ratios (ARs) 34% good angular stability within 40°. Then, applied design metasurface converters cylindrical spherical surfaces, respectively.

Based on the traditional microwave damage mechanism of RF devices, this paper proposed a special theory devices under specific environmental conditions and verifies correctness by means device physical simulation analysis comparative test verification. The results show that threshold same injection condition is about 4 to 6 dB different in two typical environments. This research reference significance field high power technology.

In this paper, the simulation model of crystal silicon solar panel is constructed. The coupling electric fields satellite in action high power pluse with different incident directions, polarization forms and risetime edges are analyzed, finally some feasible suggestions that protection on put forward.

A shooting and bouncing ray (SBR) method Based on Gaussian integrals is presented in this paper. For the traditional high frequency algorithm based triangle facet modeling, gaussian integral one of integration methods with higher accuracy, but it no longer applicable to SBR quadrangle facet. In paper, proposed calculate integral, validation was verified by comparing electrically large objects simulation results those XX-MLFMM.