Speech recognition in noisy environments is a very difficult task. It is is desirable to search for parameters that would relate the speech enhancement technique directly with the recognizer to optimize the recognition performance. In this paper, Noise Reduction Rate (NRR) and Mel Cepstrum Distortion (MelCD) are investigated when using Spectral Subtraction (SS). Under low SNR such as 0dB,5dB an...

The β-diketiminatolead(II)-amido and -anilido complexes, [(BDI)Pb(NRR')] (BDI = [{N(2,6-iPr2C6H3)C(Me)}2CH]; NRR' = NH(2,6-iPr2C6H3), N(iPr)2), react at the amido/anilido nitrogen atom with simple saturated electrophiles such as methyltriflate. Addition of unsaturated electrophiles to these complexes either results in the formation of a complex mixture of products, or in the case of phenylisocy...

Significant reduction of the overpotential NRR by adjusting bond length Cr–N in CrN 3 @graphene.

Pristine TiO2/Au (P-TiO2/Au) is modified by hydrogen plasma (H-TiO2/Au) or and oxygen (H-O-TiO2/Au) treatment, then used as electrochemical catalysts for nitrogen reduction reaction (NRR). H-TiO2/Au shows enhanced performance the NRR process compared with both P-TiO2/Au H-O-TiO2/Au. After hydrogenation some disordered regions on surface of TiO2 nanoparticles are formed, a large number vacancies...

Electrocatalytic Nitrogen Reduction Reaction (NRR) to ammonia is one of the most recent trends research in heterogeneous catalysis for sustainability. The stark challenges posed by NRR arise from many factors, beyond strongly unfavored thermodynamics. design efficient electrocatalysts must rely on a suitable interplay different components, so that majority focusing development nanohybrids or na...

Abstract The electrocatalytic nitrogen reduction reaction (NRR) has been one of the most intriguing catalytic reactions in recent years, providing an energy-saving and environmentally friendly alternative to conventional Haber–Bosch process for ammonia production. However, activity selectivity issues originating from activation barrier NRR intermediates competing hydrogen evolution result unsat...

The development of highly active DFT catalysts for an electrocatalytic N 2 reduction reaction (NRR) under mild conditions is a difficult challenge. In this study, series atom-pair (APCs) NRR were fabricated using transition-metal (TM) atoms (TM = Sc−Zn) doped into g-CN monolayers. electrochemical mechanism APCs has been reported by well-defined density functional theory calculations. calculated...

BACKGROUND Sperm selection method is usually used to collect these cells for in vitro-assisted reproduction. Few studies reported the relationship of in vivo fertility and semen parameters after sperm selection; hence, the present study attempted to assess different semen parameters after post-thaw or sperm selection, using density gradient separation BoviPure®, to predict in vivo fertility. ...

background: sperm selection is generally used to describe methods for separation of spermatozoa for in-vitro-assisted reproduction. few studies reported relation in vivo fertility and semen parameters after selection of fertile spermatozoa; hence, our research attempt to assess different semen parameters after post-thaw (pt) or after selecting sperm sample (ssp), using density gradient separati...

Electrocatalytic reduction of N2 provides a clean, sustainable way for NH3 production. Efficient catalysts thus play key role but remain long-term challenge. In this study, the catalytic activity double boron supported on graphitic carbon nitride (g-C3N4) reaction (NRR) is explored by density functional theory (DFT) calculations. Our results show that atoms embedded in g-C3N4 with coordination ...