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2 results about "Common logarithm" patented technology
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In mathematics, the common logarithm is the logarithm with base 10. It is also known as the decadic logarithm and as the decimal logarithm, named after its base, or Briggsian logarithm, after Henry Briggs, an English mathematician who pioneered its use, as well as standard logarithm. Historically, it was known as logarithmus decimalis or logarithmus decadis. It is indicated by log₁₀(x), or sometimes Log(x) with a capital L (however, this notation is ambiguous since it can also mean the complex natural logarithmic multi-valued function). On calculators, it is usually "log", but mathematicians usually mean natural logarithm (logarithm with base e ≈ 2.71828) rather than common logarithm when they write "log". To mitigate this ambiguity, the ISO 80000 specification recommends that log₁₀(x) should be written lg(x) and logₑ(x) should be ln(x).
Method, apparatus, device and medium for realizing linear value to decibel value conversion of audio
The method, apparatus, device, and medium for converting linear values of audio to decibel values provided in this disclosure include: determining a target conversion relationship between a natural logarithmic linear value and a decibel value based on an initial conversion relationship between linear values and decibel values and a conversion relationship between the natural logarithm and a common logarithm; determining the natural logarithmic linear value and a linear value in the target conversion relationship based on a coordinate rotation digital calculation algorithm; and determining the decibel value based on the correspondence between the linear value in the target conversion relationship and a preset linear value. In the process of calculating the decibel value of audio based on the linear values of audio, the calculation of the natural logarithmic linear value does not require the use of a multiplier; it can be achieved through a coordinate rotation digital calculation algorithm, which offers high accuracy in calculating the natural logarithmic linear value. Furthermore, the data processing method based on the coordinate rotation digital calculation algorithm can be directly implemented through hardware (digital circuits), resulting in lower resource consumption.
Owner:ZHUHAI NANXIN SEMICON TECH CO LTD
Method for evaluating stress relaxation of rubber material
ActiveCN118294268BPreparing sample for investigationMaterial strength using tensile/compressive forcesRubber materialCommon logarithm
The present application relates to the technical field of automobile rubber seal sealing capacity test, and discloses a kind of evaluation method of rubber material stress relaxation, the compression of the compression deformation sample of rubber material is carried out in compression deformation device, is placed in aging oven under specified temperature condition and is aged, reaches specified time, takes out sample, tests compression stress under quasi-static condition, compares compression stress value with initial force test value, records the compression stress retention rate under each time point, makes graph to the common logarithm of compression stress retention rate to time, obtains a straight line with slope, which is a simple measure of the stress relaxation of the sample, a measure of testing the sealing capacity of rubber, and can effectively reflect the change of the sealing force of the sealant.
Owner:CHERY AUTOMOBILE CO LTD