We have constructed and operated a nanoscale linear motor powered by a single metal nanocrystal ram sandwiched between mechanical lever arms. Low-level electrical voltages applied to the carbon nanotube lever arms cause the nanocrystal to grow or shrink in a controlled manner. The length of the ram is adjustable from 0 to more than 150 nm, with extension speeds exceeding 1900 nm/s. The thermody...

In-wheel motors for new energy vehicles are close to the brake, which results in a high ambient temperature. Thus, there is demand cooling systems. This paper designs an oil-spray-cooled system based on flat structural characteristics of in-wheel motor. A computational fluid dynamics method with two-phase volume-of-fluid model applied simulate transient process oil spraying from nozzles onto st...

Launch vehicles use ablative nozzle liners to function under very high thermal and erosive environments. In solid motor nozzle throats, graphite or carbon phenolic materials are used because of their high heat of ablation and erosion resistance. Ultrasonic testing is implemented as the primary NDT technique for throat insert liners by almost replacing radiography testing. Though introduced for ...

PURPOSE: The goals of this study were to 1) describe the feeding skills of young children with cerebral palsy (CP); and 2) elucidate the type and severity of feeding problems for children with and without oral-motor involvement. METHOD: Parents of 37 children (16 females, 21 males) with CP, who ranged in age from 11-58 months (mean age = 41 months), completed questionnaires regarding their chi...

This paper presents two design-and-analysis cases of a linestart axial-flux permanent-magnet motor: with solid rotor and with composite rotor. For a novel structure of the motor, two concentric unilevel spaced raised rings are added to the inner and outer radii of its rotors to enable auto-start capability. The composite rotor was coated by a thin (0.05 mm) layer of copper. The basic equations ...

The paper records a study of an investigating the performance of a solid-rotor induction motor with a rectilinear inverter excitation to identify the effects of the associated time harmonics. The performance is determined experimentally by using a stator of a three-phase laboratory induction motor that is fitted with a solid-steel rotor and compared with the theoretical model developed which us...

As a key component of the solid rocket motor, nozzle ablation is very important to performance motor. In order study influence law on motor performance, two-dimensional axisymmetric model ground state and vacuum before after was constructed basis reference profile, change pressure, temperature velocity with were studied. The comprehensive calculated evaluate performance. It found that profile c...