论文

28

2024-08
Preparation of multifunctional gypsum composite with compound foaming process

Preparation of multifunctional gypsum composite with compound foaming process

研究采用复合发泡工艺(物理发泡与化学发泡相结合)制备了轻质烟气脱硫石膏复合材料,以增强吸声和保温性能。考察了H2O2,(化学发泡剂,0.0 wt%, 1.0 wt%, 2.0 wt%, 3.0 wt%)对其吸声、隔热性能和孔隙结构的影响。x射线计算机断层扫描结果表明,与物理发泡工艺(H2O2, 0.0 wt%)相比,复合发泡工艺(H2O2, 2.0 wt%)可使孔隙配位数提高14.0%,孔隙度提高6.4%。复合发泡工艺使材料的降噪系数提高了28.57%,导热系数降低了7.68%。

05

2024-06
The effectiveness of acoustic treatments in general hospital wards in China

The effectiveness of acoustic treatments in general hospital wards in China

研究旨在通过设置吸声吊顶及隔音门窗,定量测定医院病房在正常运作时,不同声学处理对混响时间、噪声水平及使用者主观评价的影响。选取中国某医院两个普通病房的病房、走廊和护士站作为研究地点。定量测量结果表明,经过声学处理后,在病房、走廊和护士站,500 Hz-1 kHz的混响时间减少了13~53%,约为0.3 s。走廊和护士站噪声显著降低5~11 dB(A) 。不同病房的噪声水平差异较小,在日间和夜间分别降低了2~4 dB(A) 和5 ~ 6 dB(A) 。

05

2024-06
Effects of the acoustic characteristics of natural sounds on perceived tranquility, emotional valence and arousal in patients with anxiety disorders

Effects of the acoustic characteristics of natural sounds on perceived tranquility, emotional valence and arousal in patients with anxiety disorders

研究通过控制自然声音的四个声学特征因素:前景声类型、声源数量、前景与背景信噪比(FBSNR)和前景声持续时间比,对46名焦虑障碍患者进行了自然声音主观评价实验。结果表明,焦虑程度较高的患者对混合的自然声的容忍度可能较低。由两种来源组成的自然声带来了最高的情绪效价。当声源数量从2个增加到6个时,感知的宁静和情绪效价增加,而情绪唤醒减少。焦虑患者对前景音时长比为75%的混合自然声的平静感和情绪效价最高。随着前景中自然声比例的增加,情绪唤醒也逐渐减少。