The assembly of molecules or nanoparticles (NPs) into superlattice metamaterials endows them with remarkable optical, electrical, and magnetic properties, enabling applications in sensing, catalysis, optical displays. However, traditional methods face challenges, such as complex procedures, long processing times, limited areas, poor reproducibility. root cause these challenges lies mainly the difficult-to-control interactions between units ligands NPs. In this study, a novel...

Current harmonic is an important factor in power converters' dc-link design. Its accurate derivation conducive to estimating the reliability of capacitors. In active filter (APF), due its wide output bandwidth, dc link suffers current harmonics on a broader spectrum, and coupling effects among compensated make this application more complex. However, traditional methods voltage source inverters usually assume be simple sinusoid, or only calculate root mean square values. They cannot readily...

Absorbing exudate and realizing drug - controlled release are considered to be the ideal objectives effects of wound dressing. Therefore, multi layer dressing is regarded as a common means for treating burns other wounds with more in skin tissue engineering. We report unique platform based on multilayer nanofiber membrane, which can simultaneously inhibit bacterial breeding prevent infection. An electrospun fiber pad containing tetracycline hydrochloride (TCH) was prepared core layer,...

The bilayer nanofibrous membrane fabricated via electrospinning technique can be considered as an ideal structure for the treatment of chronic skin diseases and exudative wound dressings. Wound exudate would affect healing increases likelihood infection at same time. Therefore, it is essential to produce a kind dressing with relatively high hygroscopicity which could absorb provide dry environment. Bilayer membranes poly(L-lactide-co-ε-caprolactone)/tetracycline hydrochloride- polyethylene...

The reliability of dc link capacitors is closely related to the operational safety whole power electronic system. To meet application requirements, it usually necessary use a series or parallel structure multiple increase capacity and withstand voltage, which also makes difficult monitor individual in capacitor bank. This article proposed digital twin system for dc-link banks with PCB integrated Rogowski coils as sensors. uses highly obtain operating currents order realize parameter...

State-of-the-art capacitor online monitoring methods are designed for the whole dc bank. The capacitance or equivalent series resistance of bank, as an aging indicator, is obtained by sensors installed at terminal, derived from state equation system. difference parameters manufacturing and arrangement bank will result in uneven thermal stress capacitors. Due to restriction low stray inductance specification high power density requirement, traditional circuits hard be single In this article,...

Experiments show that intake flow details have a significant influence on High-Speed Direct-Injection (HSDI) diesel engine soot emissions. Four different modes were simulated using the combination of CFD codes, STAR-CD and KIVA-3V, to investigate spray-intake flow-emission interaction characteristics. The simulation results compared steady-state bench data experimental data. It was found it is difficult accurately predict timing small pilot main combustion events, simultaneously, with...

This letter proposes a simple yet practical power loss model of dc-link capacitors used in single-phase inverters. The low-frequency and high-frequency capacitor ripple current components make the existing models either oversimplified by ignoring effects or overcomplicated with detailed analytical solutions. proposed simplified can achieve negligible errors respect to without need double fast Fourier transform. Different modulations topologies are analyzed show applicability method. A 2-kW...

Gas insulated transmission line (GIL) is widely used for power in special geographical environment such as river crossing, mountain crossing and city tunnel scenarios. Because of its totally enclosed structure, it difficult to locate the fault position when internal breakdown discharge occurs. Fault location by using ultrasonic wave aroused an efficient method GIL maintenance. This paper reports experimental theoretical results attenuation propagation law signal GIL. An ultra-high voltage...

The physical radiated emission sources and main structures of a Boost converter are identified according to equivalent radiation antenna in this paper. turn-off voltage MOSFET the recovery current diode found as for their oscillation frequencies coincidence with curve measured. influence converter's metal enclosure is analyzed on two aspects, its role circuit working state change structure. CST simulation far field calculation tools adapted validate above analyses. Low impedance grounding CM...

Based on the characteristics that ship underwater electric signal is waek, a kind of acquisition equipment hardware structure designed. With instrumentation amplifier high-precision and low noise pass filter module, field collected by three dimension sensor filtered amplified. It ensures integrity validity signal.

Talkative power conversion (TPC), which can simultaneously transfer the energy and data by electronics converters avoid using extra communication infrastructures, is an emerging technique for digital digitalization of system. In this paper, TPC technology used in dual-active bridge (DAB) converter, switching frequency common phase are as degrees control freedom respectively to modulate simultaneously. The transient performances DAB modulated PWM-frequency shift keying (PWM-FSK), a simple...

Two essential requirements arise before any proposed and novel non-invasive pulsed electric field (PEF) food processing technique can be implemented in industrially meaningful systems. These are the reliable measurement of intense fast transient fields generated water close to metallic electrodes a convincing proof-of-principle demonstration technique. Recently, both these milestones have been very successfully achieved joint research programme progress at Loughborough University (UK)...

Aim at the weakness of more influenced by environment etc. factor and heat flow density lower when solar energy was make use heating, so design method hybrid ground-source pump is proposed, operating principle this system has been studied. Thermal calculating methods collector presented. Basing on a practical project, introduced ways system. Experimental results prove that coefficient performance in winter averages 4.73 refrigeration summer 3.9, economy result very obvious, research expand value.

In this paper, we shall first briefly introduce fuzzy sets and related concepts of the reaction principle Cu-ZSM-5 catalyst with NO, preparation is also investigated. And NOx conversion efficiency analyzed experiment. Compared to V 2 O 5 /WO 3 /TiO catalyst, activity at low temperature much better, while range relatively wide. Finally, diesel engine ESC test, Catalyst for SCR system can effectively reduce emissions, which installed able achieve requirements Euro Ⅳ limits.

Whether electric stealth ship, or ship by to achieve the field detection, location can’t be separated provide high-precision measuring equipment measured data, underwater discuss principle of electrochemical measurements and measurement calibration, deep understanding principles calibration can improve accuracy experiments, finally according proposed method, a type field.

The power density and reliability of the inverter can be improved with reduced DC-link capacitance by swing bus operation, etc. With insufficient capacitance, a double line frequency voltage ripple will superimposed on DC link, but how this affects loss IGBT in system has been seldom discussed. This paper analyzes influence fluctuations establishes characteristic database IGBTs under different operating voltages currents using dynamic test chamber. A switching profile-based model proposed to...

Abstract Aiming at the imbalance of soil heat caused by application Ground Source Heat Pump System in severe cold areas, energy supply performance system under control conventional operation scheme and multi-mode switching was simulated using TRMSYS simulation software. The results show that CGSHPS has good scheme; Under scheme, total extraction exchanger whole year is less than storage, consumption unit less, temperature increases 0.09°C after periodic system.

Time-domain broad-band antenna usually used for transmitting and receiving electromagnetic pulse signal. A miniaturization plate monopole ring fed by coplane waveguide was proposed, through researching on the basic parameters that as sign of antenna's time-domain characteristic analyzing microwave test antenna, this has been verified tested simulation experiments.