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1. Is there a way to measure the noise emitted from upstairs?
Core method: Use a decibel meter or a dedicated mobile app to objectively measure, supplemented by video recordings as evidence.. After understanding the actual needs, measurement can be divided into two steps: tool testing and evidence retention. There are currently three mainstream tools available in the market: ① a specialized decibel meter ② a mobile app with professional acoustic functions ③ an intelligent camera with sound pickup function. It is recommended to use a combination of two tools for actual measurement, and continuous sampling after 2-3 am or 10 pm is more legally effective. ① Testing method selection: Android users recommend the "Sound Meter" or "Decibel Meter" app, and need to select the linear weighting mode in the app settings; IOS users can use the NIOSH SLM App (developed by the Centers for Disease Control and Prevention in the United States). Choose the Ulide UT352 or Emac AM-10 for professional equipment. These handheld instruments support automatic statistical equivalent sound level Laeq and can generate internationally recognized reports. ② Evidence solidification technique: Each continuous recording must exceed the allowable noise level reference value for residential buildings (55dB during the day and 45dB at night), and simultaneously use a mobile phone to capture the visible noise source outside the window. For example, the sound of skipping rope can be automatically recorded by an intelligent camera, and models such as Huawei puffin have sound source localization function, which can correspond abnormal sounds to specific time periods. During actual testing, pay attention to closing your own doors, windows, and electrical appliances, and place the equipment in the center of the floor or on the sound wave transmission path. Continuous sampling is recommended for at least 15 minutes each time, with a focus on recording penetrating noise from 11pm to 6pm the next day. After forming a trend chart from multiple days of data, compare it with the standard values of residential living rooms in accordance with the "Code for Design of Sound Insulation of Civil Buildings" GB50118. The current environmental noise standards require low-frequency noise (such as treadmill vibration) to be measured using C-weighting. If ordinary instruments lack this function, it is recommended to choose the domestically produced Huayi HY104 model with 1/3 octave band analysis capability. When the measured value exceeds the standard value by 8 decibels, one can apply to the local environmental monitoring station for professional testing, and the report has legal effect.
2. Please find the English words in the first and second volumes of grades 5-6 on the Primary School Peoples Education Press.
The English words in the first and second volumes of grades 5-6 on the Primary School Peoples Education Press have been summarized and organized. Please check! The complete list of Baidu cloud storage resources for primary school Chinese, English, numbers, music, art, sports, nature, science, etc.: https://pan.baidu.com/s/1znmI8mJTas01m1m03zCRfQK12 Real time resource updates from: Baidu Netdisk Extraction Code: 1234 Copy Extraction Code Jump? PWD=1234 Extraction code: 1234 For various subjects and materials involved in primary school, I collect, classify, and regularly update them. Parents and teachers with needs are welcome to bookmark.