The performance of cello is a special language and a special way to express the process of psychological feeling and psychological induction. From the perspective of psychology and violin performance art, this article deeply understands the common psychological mechanism in the process of music performance through relevant literature and research results, such as the perception psychology in the process of performance.
AbstractClusters are important drivers of regional economic growth. Although their benefits are well recognized, research into their evolution is still ongoing. Most real‐world clusters seem to have emerged spontaneously without deliberate policy interventions, each cluster having its own evolutionary path. Since there is a significant gap in our understanding of the forces driving their evolution, this study uses a quantitative approach to investigate the role of inventor collaboration networks in it. Inventor collaboration networks for 30 top‐performing American metropolitan clusters were constructed on the basis of patent co‐authorship data. The selected clusters operate in hi‐tech fields: information technology, communications equipment and the biopharmaceutical industry. Starting from a widely accepted hypothesis that the 'small‐world' structure is an optimal one for knowledge spillovers and promotes innovation effectively, the authors statistically tested the impact of 'small‐world' network properties on cluster innovation performance proxied by patent output. The results suggest that the effect of the small‐world structure is not as significant as theorists hypothesized, not all clusters benefit from the presence of inventor collaboration networks, and cluster performance can be affected by policy interventions. Our analyses also suggest that cluster typology moderates the impact of inventor network properties on cluster innovation performance.
Ultra-performance liquid chromatography (UPLC) was used to detect six fluoroquinolones (FQs) in live aquatic produce sampled from the region surrounding the Dongting Lake in Hunan, China. Results showed that 8.3% of samples were contaminated with norfloxacin in the range of 4.5 to 10.3 µg/kg, and 7.3% of samples carried residual ofloxacin in the range of 6.7 to 76.0 µg/kg. One crucian carp sample was pefloxacin-positive, and one blunt snout bream sample was lomefloxacin-positive, and the level in these two samples were 18.3 and 25.1 µg/kg, respectively. Further, 3.1% of samples contained residues of enrofloxacin and (or) ciprofloxacin higher than their maximum residue limits. This survey demonstrated that banned drugs were occasionally used, and that enrofloxacin was occasionally used in excess in aquaculture in the surveyed area.
