Research on the regional difference characteristics and driving mechanisms of high-quality developmental evaluations of the construction industry under the constraint of carbon emissions has important practical significance for guiding the efficient development of the construction industry, alleviating the contradiction between economic and social development and resource conservation, low-carbon requirements in the process of rapid urbanization, and realizing regional coordinated development. Taking carbon emissions as unexpected output into the evaluation system of high-quality development of construction industry, this paper studies the spatial–temporal differentiation characteristics, dynamic trend evolution and its driving factors of high-quality development of China’s construction industry from 2006 to 2021 by using the SE-SBM model of unexpected output, GML index analysis and grey correlation model. The research results show that: (1) from 2006 to 2021, the high-quality development of the construction industry generally fluctuated in a sinusoidal function pattern, and the high-quality development level of the construction industry in China was improved as a whole. It is manifested in the coexistence of regional imbalance and spatial correlation. High-efficiency provinces are concentrated in the eastern coastal areas, forming an obvious cluster effect; however, the radiation-driving effect is weak. (2) The regional difference in technological scale change is the largest, which is the main reason for the difference in regional total factor production growth rate; the contribution of technological progress to the difference in total factor growth rate is also relatively large. Generally speaking, technological factors are the key to reducing the difference of total factor growth rate between regions. (3) Urbanization level, carbon emission constraints, government regulation, scientific and technological R & D investment and industrial structure upgrading are the main driving factors that affect the spatiotemporal differentiation and evolution of high-quality development of the construction industry.

The acoustic environment of karst tourist caves significantly impacts visitor experience and the effectiveness of information dissemination, yet systematic studies on their acoustics remain scarce. This study investigates the acoustic properties of a representative karst tourist cave in Guizhou Province, China, by combining in-situ measurements with 3D laser scanning. Impulse responses were systematically recorded at 22 positions across six caverns, and key parameters—including reverberation time (T₂₀), early decay time (EDT), definition (D₅₀), clarity (C₈₀), and speech transmission index (STI)—were analyzed in relation to spatial geometries obtained from 3D scans. The results reveal substantial spatial variations in acoustic conditions: mid-frequency T₂₀ ranges from 1.4 s to 3.1 s, largely governed by cavern volume, geometry, and entrance-related attenuation. The average EDT/T₂₀ ratio is 0.70, indicating non-uniform early decay behavior. While D₅₀ values are relatively consistent (0.49–0.74), C₈₀ shows greater variability (1.86–6.89 dB), both influenced by spatial complexity. Furthermore, significant correlations exist between STI and other parameters (P < 0.01), confirming that reverberation control and early-energy enhancement are crucial for improving speech intelligibility. These findings provide a scientific basis for acoustic optimization in show caves, supporting better guided tours and safety communications.

Blended Synchronous Learning helps teachers and students communicate without geographical restrictions. The effect of communication between the face-to-face end and the remote end was not only affected by the performance of the equipment but also by the acoustic conditions in the classroom. This paper measured the acoustic parameters in the hybrid classrooms and conducted subjective speech intelligibility tests. It was found that for the hybrid classroom with a decentralized sound reinforcement system, the background noise level was high because lots of equipment was needed for synchronous learning. The speech intelligibility scores of the remote end were lower than those at the face-to-face end. Acoustic parameters of reverberation time (RT) and excessive signal-to-noise ratio (SNR) showed a negative correlation with speech intelligibility scores in the remote end. It was recommended that the sound pressure level (SPL) of the sound reinforcement system should not be too high and that appropriate sound absorption treatment be performed. The size of the hybrid classroom should be controlled to prevent the sound that arrived 50 ms after the direct sound from arriving. When SNR was 33 dB(A) for hybrid classrooms, which had a good performance in the face-to-face end with the speech intelligibility scores, T₂₀ should be within 0.8 s to achieve the target value of 83% for SI scores at the remote end.

Traditional timber-framed buildings in Southwest China hold international recognition for their historical, cultural, artistic, and social value, yet their physical performance adequacy for modern living remains unexamined. Field tests on Miao dwellings in Jidao Village, Guizhou, characterized wall sound insulation and assessed contemporary suitability. Key results indicate: Newly “L-shaped” dwellings exhibited optimal wall insulation. Critical frequencies in modern walls aligned with experimental ranges, traditional walls showed lower experimental than theoretical values. Traditional exterior wall insulation increased with enclosure (“U-shaped” courtyard > “L-shaped” > “linear layout”, Max≈2 dB), while internal walls showed no significant differences. Enclosed layouts attenuated noise transmission, enhancing overall insulation. Traditional and newly “Linear-type” dwellings showed comparable performance, but new “L-shaped” dwellings with double-layer timber and embedded rock wool (30 mm) outperformed others by 8–14 dB. Exterior and bedroom walls critically influenced overall insulation, directly impacting daily life. Enhancing insulation while preserving ethnic features is essential.