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Phonetic study of voiced and voiceless stops in Hindi

Juglan K. C., Kaur J., Upadhyay R. K.

International Journal of Applied Mechanics and Engineering

2011

Vol. 16, no 3

661-670

This paper presents findings from a phonetic study of voiced and voiceless stops. To distinguish voiced and voiceless stops, we have to measure three parameters, namely the vowel length, duration of CVC syllables and voice onset time (VOT) of the word-initial consonants. For measuring the vowel length and gap duration, we considered 10 voiced (/b, d, d., g, d3/) and voiceless (/p, t, t., k, t /) stop consonants and two abutted vowels /a/ and /i/. For measuring voice onset time, we considered 3 voiced (/b, d., g/) and voiceless (/p, t., k/) stop consonants. These sounds were recorded with the help of GOLDWAVE software in the sound proof lab at C-DAC (Centre for Development of Advanced Computing), NOIDA. The utterances were acoustically analyzed via PRAAT. The values of target stops were obtained from the waveform and verified with the spectrogram. The wide band spectrograms and text grids were plotted by using "PRAAT" software.

Inhibition Effect of Nitrogen Containing Ligands on Corrosion of Aluminium in Acid Media with and with out KCl

Sethi T., Chaturvedi A., Upadhyay R. K., Mathur S. P.

Polish Journal of Chemistry

2008

Vol. 82, nr 3

591-598

Mass loss and thermometric methods have been used to study the corrosion inhibition of aluminium in HCl solution by nitrogen containing ligands viz. N-(4-N,N-dimethyl - aminobenzal)-p-anisidine (SB1), N-(4-N,N-dimethylaminobenzal)-p-toluidine (SB2) and N-(4-N,N-dimethylaminobenzal)-2,4-dinitroaniline (SB3). Results of inhibition efficiencies obtained from these two methods are in good agreement and have been found to be dependent upon the concentration of inhibitors as well as concentration of acids. Inhibition efficiency of synthesized ligands has also been studied in the presence of KCl with inhibitors.