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An acoustic board is a board made from sound absorbing materials, designed to provide sound insulation. [3] [4] Between two outer walls sound absorbing material is inserted and the wall is porous. Thus, when sound passes through an acoustic board, the intensity of sound is decreased. The loss of sound energy is balanced by producing heat energy.
The Federal Board of Revenue (FBR) (Urdu: وفاقی بورڈ محصولات), formerly known as Central Board of Revenue (CBR), is a federal law enforcement agency of Pakistan that investigates tax crimes, suspicious accumulation of wealth, money-laundering make regulation of collection of tax. FBR operates through Inspectors-IR that keep tax ...
The Directorate General of Intelligence and Investigation (DG I&I) (Urdu: نظامتِ عمومی برائے سراغرسانی و تفتیش) operates as a department under the Federal Board of Revenue (FBR) in Pakistan. While its core function is to serve as the intelligence wing of the FBR, it is actively engaged in the day-to-day ...
A pair of headphones being tested inside an anechoic chamber for soundproofing. Soundproofing is any means of impeding sound propagation.There are several methods employed including increasing the distance between the source and receiver, decoupling, using noise barriers to reflect or absorb the energy of the sound waves, using damping structures such as sound baffles for absorption, or using ...
The sound reduction index is used to measure the level of sound insulation provided by a structure such as a wall, window, door, or ventilator. It is defined in the series of international standards ISO 16283 (parts 1-3) and the older ISO 140 (parts 1-14), or the regional or national variants on these standards.
Travel intelligence company OAG has released its annual list of the world’s busiest flight routes — and the 105-minute hop between the two has topped the international route board, with nearly ...
The FDA said the recall only applies to egg cartons with the Julien code 327 and a "use by" date of January 5, 2025, which is also printed on the side of the package. "No other products are ...
Taxation in Pakistan is a complex system of more than 70 unique taxes administered by at least 37 agencies of the Government of Pakistan. [1] According to the FBR, in 2021, the number of registered tax filers had grown to 7.1 million out of which only 2.5 million were active tax filers. [ 2 ]