In mobile devices such as aircraft and electric vehicles, due to limited space, there are strict requirements on the volume weight of compressor mounted vehicle. Therefore, high-speed scroll compressors have attracted more attention because their small size light weight. this paper, numerical calculations analysis three-dimensional (3D) transient flows in a refrigeration were established validated. Circumferential gas intake was used simulation. According actual size, mesh generation...

Background and objective: Electroencephalography (EEG) can be used as an interface to control machines with human intention, especially for paralyzed people in rehabilitation exercises or daily activities. Some effort was put into but still not enough. To improve the practicality, this study aims propose efficient method based on P300, a special EEG component. Moreover, we also develop upper-limb assist robot system thorough security measures verification. Methods: We concentrated P300 that...

Deniable authentication protocol allows a sender to deny his/her involvement after the run and receiver can identify true source of given message.Meanwhile, has no ability convince any third party fact that message was sent by specific sender.However, most proposed protocols didn't achieve confidentiality transmitted message.But, in some special application scenarios such as e-mail system, electronic voting Internet negotiations, not only property deniable but also are needed.To settle this...

A.S. Belmont⇓, Y. Hu, P.B. Sinclair1, W. Wu, Q. Bian and I. Kireev2 Department of Cell Developmental Biology Center for Biophysics Computational Biology, University Illinois, Urbana, Illinois 61801 Correspondence: asbel{at}illinois.edu

This paper presents a new edge blunting method of the three screw pump rotor with an elliptic arc and equations profile after blunting. Through comparisons different geometrical parameters pump, i.e., flow area, contact line length per lobe, blow hole etc., is proved to be better than existing profiles pump. The streamlined profile, significantly smaller reference significance for optimization design further improvement

Reliability of the traditional single screw compressor (SSC) is poor since its discharge capacity decreases sharply. This because that lubrication between and gate-rotor meshing pair poor, which leads to a rapid abrasion pair. In this paper, simulation model established analyze problem in SSC. Based on straight line enveloped profile new proposed multi-columns-enveloped profile, hydrodynamic lubricating characteristics water-flooded are investigated. Results show water film can keep tooth...

Cylindrical milling of a screw rotor groove in single compressor has higher machining efficiency than turning. However, the bottom produced by flat end cutter fails to mesh hermetically with tooth tip due oversized clearance between them. The forms two leakage paths leading compressed gas leakage. shape path is roughly same as that parallel oblate divergent nozzles an inverse orientation. A mathematical simulation presented for surface profile generated using several cylindrical cutters....

The wear of star-wheel teeth is an important problem in single screw compressors. In order to prolong the service life star wheels, a new curved flank tooth proposed. Section profile curve, which could be elliptical, hyperbolic, involute, or defined. groove envelope surface corresponding flank. During meshing with groove, contact line moves area.

Level set methods have been widely used in image processing and computer vision. The re-initialization problem of level limits its application. Recently proposed distance regularized evolution (DRLSE) can avoid re-initializations, the DRLSE formulation allows use more general efficient initialization function provides a simple narrowband implementation to greatly reduce computational cost. However diffusion rate may incur undesirable side effect some circumstances, thus influence...

The study of 3D Tele-immersion impact on remote collaborative work represents a very interesting and challenging research topic. In this paper, we introduce the latest accomplishments TEEVE which merges computer science with dance choreography. This model is ideal for creative, interdisciplinary problem solving. offers an entirely new interface choreography as creative tool alternative performance venue.

Single screw compressor (SSC), a strong competitor of the twin compressor, is regarded as an excellent gas because symmetrical structure and balanced forces on rotor. However, market for SSC tiny compared with that serious abrasion star-wheel teeth. In recent years, this problem has been solved due to development new profiles meshing pairs, attracted more attention its high application potential low-temperature heat pump, mechanical vapor recompression, two-phase expansion. Nevertheless,...

According to the statistical results of reciprocating compressor maintenance in chemical enterprises, probability faults caused by wear or damage vulnerable parts inside cylinder is close 80%. Now, fault diagnosis relied on vibration signal, acoustic emission thermal parameters. However, it difficult extract eigenvalues from signals and signals, which can be disturbed noise easily. Thermal parameters are relatively stable less affected noise. The measurement requires drilling testing holes...