文章筛选结果

Time difference effect and echo sensation

2022-01-18

Basic principles for selecting sound-absorbing materials

2021-12-22
A reasonable room reverberation time needs to define the sound absorption characteristics of each boundary surface. That is, different sound-absorbing material properties are set for each surface o...

Audible frequency and sound pressure range

2021-08-26

Wave front and sound ray

2021-07-15

Sound production and propagation

2021-06-10

Tips about sound-absorbing panels

2021-04-08

Basic principles for setting and selecting sound-absorbing materials

2021-03-18

​北方水泥逾25亿购牡丹江北方51%股权

2017-08-29
公告显示,牡丹江北方,由北方水泥及金刚集团拥有49%及51%股权,主要经营水泥、特种水泥及相关产品、半成品的生产、...

晋江三家陶企被罚登报发环保承诺书

2017-08-28
从环保承诺书上可知,三家陶企均是因为违反了环保法有关规定,而受到晋江市环保局行政处罚

稀土行业协会建议适量增加总量控制指标

2017-08-28
近期,以镨钕为代表的稀土氧化物及金属价格上涨较快,引起各方关注。上证报记者从业内获悉,工信部原材

贵州数条水泥线被叫停 涉两家全国十强

2017-08-28
8月14日,贵州省经信委和发改委联合发文《关于停止建设部分水泥项目的公告》(黔经信原材料﹝2017﹞33号)