Sentence compression has attracted much interest in recent years, but most sentence compressors are extractive, i.e., they only delete words. There is a lack of appropriate datasets to train and evaluate abstractive sentence compressors, i.e., methods that apart from deleting words can also rephrase expressions. We present a new dataset that contains candidate extractive and abstractive compres...

Abstract The stability limit of a tip-stalling axial compressor is sensitive to the magnitude near-casing blockage. In transonic compressors, presence passage shock could be major cause for Identification and elimination this blockage key improving compressor. article, using numerical simulation, within rotor, NASA Rotor 37, quantified parameter. For smooth casing, at conditions near stall maxi...

The development of a series of sin~le-stage, oilfree screw air compressors with a compression ratio of 8, previously obtainable only with two-sta~e compressors, is described. A new rotor profile, which reduces leakage loss to achieve higher efficiency, and desig-ned for ease of manufacture, is detailed. Additionally, a new desig-n method for the clearance between rotors, to compensate for rotor...

Isobaric expansion (IE) engines can directly convert heat into mechanical energy, making them particularly attractive for applications such as vapor-driven pumps and compressors. A recent initial assessment investigating the utilization of IE reciprocating compressors has revealed that vapor use efficiency is inherently low in case simplest direct-acting compressor designs. Based on this analys...

This paper considers online compression algorithms that use at most polylogarithmic space (plogon). These algorithms correspond to compressors in the data stream model. We study the performance attained by these algorithms and show they are incomparable with both pushdown compressors and the Lempel-Ziv compression algorithm.

Screw compressors have the advantage of low mechanical vibration levels similar to those found in centrifugal compressors due their rotary motion. However, screw compressors are positive displacement machines with a working principle similar to reciprocating compressors, which gives screws some advantages compared to centrifugals, such as: • The suction volume flow and power consumption grow li...

The efficiency of the scroll compressor which employs the axial and the radial sealing techniques is competitive with that of the other rotary and the reciprocating compressors. The bearing load and the torque are smooth so that quiet operation is realized. 'l'herefore the machine is suitable particularly for air conditioning application. The authors have studied the scroll compressor which uti...