Multifunctional microwave absorbing materials are urgently needed in aircrafts due to their harsh service environment. Herein, a rare-earth [email protected] nanofiber aerogel has successfully manufactured meet this demand. The light not only exhibits wide efficient bandwidth (7.44 GHz) and strong reflection loss (−63.7 dB), but also excels infrared thermal camouflage, self-cleaning, mechanical strength. These excellent properties related the porous construction of plenty heterogeneous...

To improve the limitations of traditional microwave absorbing materials (MAMs), such as high density and narrow absorption bandwidth, neodymium oxide/carbon nanofiber (Nd2O3/CNF) composites were successfully prepared by electrospinning technology combined with a high-temperature carbonization process. The three-dimensional network structure CNFs provides path for conducting electromagnetic waves, its porous also increases multiple reflections waves in composite fibers, which significantly...

Incorporating foam into slurry can improve its wall-supporting performance. However, the wall formation mechanism of under different conditions remains unclear. In this study, numerical simulations were conducted to investigate influence soil properties, composition, and pressure gradient on infiltration process effectiveness slurry, which was validated through laboratory experiments. The results indicate that in be divided three stages—infiltration, clogging, membrane formation. time...

High chromium cast iron (HCCI) has been widely used as wear-resistant material in the industry. Alloying is an effective way to improve microstructure and mechanical properties of HCCI. This paper added multi-component V-Fe-Ti-Nb-C-Zr-B alloy (VFC) HCCI, showing a significant synergistic solution-strengthening effect. The results show that V-Ti-Nb-B are dissolved M7C3 carbide form (Cr, Fe, V, Ti, Nb)7(C, B)3 carbide, small amount V all Zr austenite martensite. Adding VFC into HCCI improved...

In an axial granular bed filter (GBF), a new mesoscale simulation approach is obtained by combining the macroscopic calculation models, i.e., equations of total pressure drop and dust-removal efficiency into porous media model source term conservation equations. After grid-dependent tests experimental validation, effects different conditions, height L, superficial gas velocity ug, dust diameter dp, concentration cp, dg, initial voidage ε0, filtration time t, on are investigated. The results...

Recently, Micro Electro Mechanical Systems (MEMS) sensor chips are widely used for human motion analysis because of their high-precision measurement, compact structures and the lower cost. In our research, a group new multi-axis MEMS sensors including six-axial module (MPU6050, triaxial gyroscope accelerometer), magnetometer (HMC5883L) were incorporated to construct nine degrees freedom MEMS-sensor module, which can communicate with personal computer through WIFI module. Smart phone be in...

This paper presents the mutual authentication scheme based on bilinear pairings with deployment of smart card. We propose a novel technique using double secret keys and random numbers for preventing forgery attack in process. It enhances security system accomplishes safely between user remote system. Finally, we provide validity attestation analysis its compute complexity.

Abstract Many problems in artillery systems can be described using partial differential equations (PDEs), and engineers need to repeatedly adjust the design object meet requirements of phase. Therefore, an efficient PDEs solver is needed during solvers based on deep learning, especially neural operators, this requirement. However, operators use multi-layer perceptrons (MLP) project data features onto output dimension, MLP lack interpretability, often face overfitting gradient vanishing,...

The paper provides a new idea on improving the calculating speed of complex economic system evaluation by adopting LM algorithms based BP artificial neural network. It deeply discusses concrete implementation process and using comprehensive performance fixed assets invest module as example, carries systematic analysis investment whole country 31 provinces, cities autonomous region according to result. result shows that comprehensively evaluate similar, uncertain, even self-contradict indexes...

The data of the electric power information acquisition system can generate mass by accumulation.It is a question to store as increase sampling frequency.Facing properties with large scale and larger gathering density, it will be less efficient if past technology adopted in practical applications.In order solve problems collection storage transfer real time, new multi-database fusion technique proposed, namely reach, design implementation D3Base based on distributed relational database NOSQL...

The portable fabrication of multifunctional, lightweight, and ultra-wide absorption bandwidth electromagnetic wave absorbing materials remains a significant challenge. In this study, both component modulation architecture design were simultaneously employed to construct layered porous foam (EMAF) with Nd2O3@CNFs as the backbone waterborne polyurethane (WPU) strach cross-linking agents. Due rich heterogeneous interfaces brought by multiple components coupling structure Nd2O3@CNFs, EMAF-4...

Methods of electric potential on shielding and magnetron-discharge are two ordinary methods vacuum level measuring for circuit breakers. In this paper, the joint application is researched. The fuzzy control theory applied, credibility different given. Then through data fusion, accuracy improved. At last, based fusion matrix eliminating invalid data, a method judging whether sensor put forward, as assistant means to control.

As the accidents are frequent in process of vacuum level measuring interrupters and results with bad consistency. The accuracy can't be assured by only one method. More than two method used this paper, such as magnetism-control discharges shield electric-potential. Fuzzy neural networks controller is designed for each method, to realize ¿vertical¿ fuzzy judge. Then data fusion based on ¿horizontal¿ control gain value highly reliability. In end, ineffective eliminated matrix theory whether...

A real-time exhaust monitoring system that based on NDIR and ZIGBEE is proposed in accordance with the Lambert-beer law fact gas could absorb infrared ray selectively. There are several characteristics of this system. First, a new non-dispersed sensor electro-modulated photo-source used, mechanical modulator commonly appears traditional method saved. The application pyroelectric integrated high-precision interference filter be second feature. third feature dual-wavelength single-beam...

In an axial granular bed filter (GBF), a new mesoscale simulation method is obtained by combining the macroscopic calculation models into porous media model and source term of conservation equations. After grid independence test experimental validation, effects different conditions, i.e., height L , superficial gas velocity u g dust diameter d p concentration c initial voidage ε 0 filtration time t on pressure drop removal efficiency are investigated. The results show that related to...