Lenisering etter kort vokal: relikt-fenomen eller opphav?

The topic of the paper is a small group of Norwegian dialects where lenition of p, t, k into b, d, g in intervocalic and word-final position is limited to words characterized by a monomoraic, stressed syllable in Old Norse. These dialects are spoken in the easternmost local communities in Agder county, at the eastern margin of the South-Norwegian lenition areas where lenition hit all short oral stops irrespective of preceding vowel length. After the quantity shift had made all stressed vowels bimoraic, with rimes being either VV or VC, the distribution of the lenited plosives are after both long and short vowels (the main area) or after short vowels only (the eastern marginal area). Haslum (2004) argues that the limited distribution in the east ist the result of a reversal after long vowels only. While this cannot be refuted as a possibility, I argue below that it may also be the result of a two-stage process, whereby lenition after a short vowel has spread further than the generalized process.

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The prosodic licensing of coda consonants in early speech: interactions with vowel length

Journal of Child Language ◽

10.1017/s0305000915000185 ◽

2015 ◽

Vol 43 (2) ◽

pp. 265-283 ◽

Cited By ~ 5

Author(s):

KELLY MILES ◽

IVAN YUEN ◽

FELICITY COX ◽

KATHERINE DEMUTH

Keyword(s):

Young Children ◽

Acoustic Analysis ◽

Short Vowel ◽

Elicited Imitation ◽

Vowel Length ◽

Short Vowels ◽

English Speaking ◽

Australian English ◽

Open Class ◽

Lexical Constraints

AbstractEnglish has a word-minimality requirement that all open-class lexical items must contain at least two moras of structure, forming a bimoraic foot (Hayes, 1995).Thus, a word with either a long vowel, or a short vowel and a coda consonant, satisfies this requirement. This raises the question of when and how young children might learn this language-specific constraint, and if they would use coda consonants earlier and more reliably after short vowels compared to long vowels. To evaluate this possibility we conducted an elicited imitation experiment with 15 two-year-old Australian English-speaking children, using both perceptual and acoustic analysis. As predicted, the children produced codas more often when preceded by short vowels. The findings suggest that English-speaking two-year-olds are sensitive to language-specific lexical constraints, and are more likely to use coda consonants when prosodically required.

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Syllable weight, vowel length and focus in Lebanese Arabic

Glossa a journal of general linguistics ◽

10.16995/glossa.5727 ◽

2021 ◽

Author(s):

Niamh Kelly

Keyword(s):

Syllable Structure ◽

Short Vowel ◽

Vowel Duration ◽

Consonant Cluster ◽

Vowel Length ◽

Syllable Weight ◽

Contrastive Focus ◽

Short Vowels ◽

Levantine Arabic ◽

Lebanese Arabic

Research on a variety of languages has shown that vowel duration is influenced by phonological vowel length as well as syllable structure (e.g., Maddieson, 1997). Further, the phonological concept of a mora has been shown to relate to phonetic measurements of duration (Cohn, 2003; Hubbard, 1993; Port, Dalby, & O'Dell, 1987). In Levantine Arabic, non-final closed syllables that contain a long vowel have been described as partaking in mora-sharing (Broselow, Chen, & Huffman, 1997; Khattab & Al-Tamimi, 2014). The current investigation examines the effect of vowel length and syllable structure on vowel duration, as well as how this interacts with durational effects of prosodic focus. Disyllabic words with initial, stressed syllables that were either open or closed and contained either a long or a short vowel wereexamined when non-focused and in contrastive focus. Contrastive focus was associated with longer words and syllables but not vowels. Short vowels were shorter when in a syllable closed by a singleton but not by a geminate consonant, while long vowels were not shortened before coda singletons. An analysis is proposed whereby long vowels followed by an intervocalic consonant cluster are parsed as open syllables, with the first consonant forming a semisyllable (Kiparsky, 2003), while long vowels followed by geminate consonants partake in mora-sharing (Broselow, Huffman, Chen, & Hsieh, 1995). The results also indicate compensatory shortening for short vowels followed by a singleton coda.

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Two-Stage Biodiesel Synthesis from Used Cooking Oil with a High Acid Value via an Ultrasound-Assisted Method

Energies ◽

10.3390/en14123703 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3703

Author(s):

Ming-Chien Hsiao ◽

Wei-Ting Lin ◽

Wei-Cheng Chiu ◽

Shuhn-Shyurng Hou

Keyword(s):

Acid Value ◽

Molar Ratio ◽

Optimal Conditions ◽

Two Stage ◽

Cooking Oil ◽

High Acid ◽

Used Cooking Oil ◽

Biodiesel Synthesis ◽

Stage Process ◽

Ultrasound Assisted

In this study, ultrasound was used to accelerate two-stage (esterification–transesterification) catalytic synthesis of biodiesel from used cooking oil, which originally had a high acid value (4.35 mg KOH/g). In the first stage, acid-catalyzed esterification reaction conditions were developed with a 9:1 methanol/oil molar ratio, sulfuric acid dosage at 2 wt %, and a reaction temperature of 60 °C. Under ultrasound irradiation for 40 min, the acid value was effectively decreased from 4.35 to 1.67 mg KOH/g, which was decreased to a sufficient level (<2 mg KOH/g) to avoid the saponification problem for the subsequent transesterification reaction. In the following stage, base-catalyzed transesterification reactions were carried out with a 12:1 methanol/oil molar ratio, a sodium hydroxide dosage of 1 wt %, and a reaction temperature of 65 °C. Under ultrasound-assisted transesterification for 40 min, the conversion rate of biodiesel reached 97.05%, which met the requirement of EN 14214 standard, i.e., 96.5% minimum. In order to evaluate and explore the improvement of the ultrasound-assisted two-stage (esterification–transesterification) process in shortening the reaction time, additional two-stage biodiesel synthesis experiments using the traditional mechanical stirring method under the optimal conditions were further carried out in this study. It was found that, under the same optimal conditions, using the ultrasound-assisted two-stage process, the total reaction time was significantly reduced to only 80 min, which was much shorter than the total time required by the conventional method of 140 min. It is worth noting that compared with the traditional method without ultrasound, the intensification of the ultrasound-assisted two-stage process significantly shortened the total time from 140 min to 80 min, which is a reduction of 42.9%. It was concluded that the ultrasound-assisted two-stage (esterification–transesterification) catalytic process is an effective and time-saving method for synthesizing biodiesel from used cooking oil with a high acid value.

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