Can In-Line Iodine Value Predictions (NitFomTM) Be Used for Early Classification of Pork Belly Firmness?

Commercial technologies for assessing meat quality may be useful for performing early in-line belly firmness classification. This study used 207 pork carcasses to measure predicted iodine value (IV) at the clear plate region of the carcass with an in-line near-infrared probe (NitFomTM), calculated IV of belly fat using wet chemistry methods, determined the belly bend angle (an objective method to measure belly firmness), and took dimensional belly measurements. A regression analysis revealed that NitFomTM predicted IV (R2 = 0.40) and belly fat calculated IV (R2 = 0.52) separately contributed to the partial variation of belly bend angle. By testing different NitFomTM IV classification thresholds, classifying soft bellies in the 15th percentile resulted in 5.31% false negatives, 5.31% false positives, and 89.38% correctly classified soft and firm bellies. Similar results were observed when the classification was based on belly fat IV calculated from chemically analyzed fatty acid composition. By reducing the level of stringency on the percentile of the classification threshold, an increase in false positives and decrease in false negatives was observed. This study suggests the IV predicted using the NitFomTM may be useful for early in-line presorting of carcasses based on expected belly firmness, which could optimize profitability by allocating carcasses to specific cutout specifications.

Acoustic Variation of Syllable-Initial [ŋ] in Zhengding Chinese

The study explores the acoustic properties of syllable-initial [ŋ] in Zhengding dialect, to see whether the younger generation shows the same pattern with the senior group. 60 items with vowel realizations [ʌ, a, ɑ, ə, ɤ] and [ai, ɑo, ou] in ‘[ŋ]-V’ and ‘[g]-V’ structures are produced by 8 native speakers. Three experiments are conducted. Experiment I compares ‘[ŋ]-V’ and ‘[g]-V’ structures in senior speeches. Three acoustic effects due to the initial [ŋ] are established: vowels become less distinctive from each other by decreasing the first formant (F1), increasing the second formant (F2), and shrinking the gap between the second formant (F2) and the third formant (F3). Experiment II is conducted between ‘[ŋ]-V’ and ‘[g]-V’ in the younger speakers, investigating whether they have a similar pattern with the seniors. Experiment III is supplemented to compare the younger speeches in Zhengding dialect and Mandarin, to explore whether the generational variation in Zhengding dialect is relevant to dialect contact, i.e., whether the younger speakers are largely influenced by Mandarin. The result shows the younger generation does not produce the initial [ŋ] with the vowel realizations [ʌ, a, ɑ, ə, ai, ɑo, ou], which traditionally have an initial [ŋ], with an exception in [ɤ]. A fusion process is assumed in [ɤ] in the younger pattern, in which the initial nasal [ŋ] and the following vowel [ɤ] are combined into the single nasalized vowel [ɤ̃], with the nasal effects remained, but the initial nasal then deleted. From the sociovariationist perspective, the nasal-initial pronunciation is a partial variation in Zhengding dialect. Not all speakers pronounce with the velar-initial [ŋ]. The older generation largely remained the velar-initial variant, but the younger generation preferred the zero-onset, which might be due to the influence of dialect contact with Mandarin.

An Experimental Analysis of the Real Dynamic Behavior and the Reliability Verification of an Existing Footbridge

The investigated existing footbridge, on which the dynamic experimental analysis was concentrated, was built across Vltava River in Prague in 1984. Since putting into operation, the footbridge was apparently sensitive to dynamic excitation by passing pedestrians. Above that in the course of its existence the considerable part of the footbridge deck was overflowed by two great floods that happened in August 2002 and in June 2013. After the second flood, a visible damage on the footbridge deck was detected by a visual inspection. The described dynamic experiment was divided into two basic parts. The experimental modal analysis was carried out first and then the dynamic load test was realized. It was focused to the deck vibrations induced by different pedestrians groups. It was found out the footbridge deck vertical accelerations exceed the pedestrian comfort limit in some normal situations. On the basis of comparison between modes of natural vibrations, which were evaluated by the experimental modal analysis and the equivalent ones from previous dynamic experiments, it was validated that the discovered deck damage caused the partial variation of fundamental dynamic footbridge behavior.