The quantity language Yakut (Sakha) has a binary distinction between short and long vowels. Disyllabic words with short and long vowels in one or both syllables were extracted from spontaneous speech of native Yakut speakers. In addition, a controlled production by a native speaker of disyllabic words with different short and long vowel combinations along with contrastive minimal pairs was recorded in a phonetics laboratory. Acoustic measurements of the vowels' fundamental frequency, duration, and intensity showed a significant consistent lengthening of phonologically long vowels compared to their short counterparts. However, in addition to evident durational differences between long and short quantities, fundamental frequency and intensity also showed effects of quantity. These results allow the interpretation that similarly to other non-tonal quantity languages like Finnish or Estonian, the Yakut vowel quantity opposition is not based exclusively on durational differences. The data furthermore revealed differences in F0 contours between spontaneous and read speech, providing some first indications of utterance-level prosody in Yakut.

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We investigated vowel quantity in Yakut (Sakha), a Turkic language spoken in Siberia by over 400,000 speakers in the Republic of Sakha (Yakutia) in the Russian Federation. Yakut is a quantity language; all vowel and consonant phonemes have short and long contrastive counterparts. The study aims at revealing acoustic characteristics of the binary quantity distinction in vowels. We used two sets of data: (1) A female native Yakut speaker read a 200-word list containing disyllabic nouns and verbs with four different combinations of vowel length in the two syllables (short–short, short–long, long–short, and long–long) and a list of 50 minimal pairs differing only in vowel length; (2) Spontaneous speech data from 9 female native Yakut speakers (aged 19–77), 200 words with short vowels and 200 words with long vowels, were extracted for analysis. Acoustic measurements of the short and long vowels’ f0-values, duration and intensity were done. Mixed-effects models showed a significant durational difference between long and short vowels for both data sets. However, the preliminary results indicated that, unlike in quantity languages like Finnish and Estonian, there was no consistent effect of f0 as the phonetic correlate in Yakut vowel quantity distinction.

Statistical analysis of the annual dynamics of morbidity makes it possible to quantify three forms of manifestation of the epidemic process: 1) year-round morbidity; 2) seasonal, "premium", 3) outbreak morbidity [4]. The obtained results can be used for separate planning of anti-epidemic measures for the purpose of operational observation and short-term forecasting [1, 2a, b].