#attenuation

[zeipieconnofiltrickdenback]

[dr-afsaeed]

Immunophenotypic skewing of B cells toward IgD⁻CD27⁻IgG⁺ subtype and metabolic attenuation in colorectal cancer - Research

Colorectal cancer (CRC) is the third most prevalent cancer and understanding its tumor microenvironment (TME) is crucial for the development of innovative therapies. Despite the presence of B cells in CRC infiltrate, their clinical significance is poorly understood. In this study, we observed an enrichment of double-negative (DN) B cells, a subset lacking surface IgD and CD27, in CRC biopsies.…

[dr-afsaeed]

Immunophenotypic skewing of B cells toward IgD⁻CD27⁻IgG⁺ subtype and metabolic attenuation in colorectal cancer - Research

Colorectal cancer (CRC) is the third most prevalent cancer and understanding its tumor microenvironment (TME) is crucial for the development of innovative therapies. Despite the presence of B cells in CRC infiltrate, their clinical significance is poorly understood. In this study, we observed an enrichment of double-negative (DN) B cells, a subset lacking surface IgD and CD27, in CRC biopsies.…

[biology-geology-beaches-india]

The Scientific Research Notes of S. Sunkavally (years:2002-2011).

4286-4287.

[nnctales]

Exploring How Soil Properties Influence Earthquake Magnitude and Extent

Introduction: Earthquakes are natural phenomena that occur when there is a sudden release of energy in the Earth’s crust, causing seismic waves to ripple through the ground. While the magnitude and extent of earthquakes are primarily influenced by tectonic plate movements, the properties of the soil in a particular region play a crucial role in determining the impact of seismic activity.…

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[networkeducative]

Attenuation in Data Communication

Attenuation in Data Communication

Suppose two persons are talking over a wired connection. The sound, receiver hears is not loud enough to understand what the caller is saying. However, the caller is saying with enough loudness. So, what makes the volume go low at the receiver. The reason is attenuation, and it is caused due to the imperfection of the transmission medium.

In this case, wire is the transmission medium. Consider a voltage V is applied across a wire of resistance R, and current I flows through it for time t. Some of the electrical energy is lost to overcome the wire's resistance. The energy lost is dissipated as heat which is calculated as H = Rt*I^2 Similarly, when the signal travels through the transmission medium, it experiences some resistance. The signal loses some of its energy to overcome the resistance. This loss of energy of a signal is called attenuation. It decreases the amplitude of the signal obtained at the receiver, which reduces the volume of the sound the receiver hears. The signal's amplitude is increased with devices called amplifiers to compensate for the losses due to attenuation. It makes the sound at the receiver loud enough.

So, along with a wire or transmission medium, the signal loses its strength as it moves from point A to point B and gains strength from point B to point C. The loss or gain in signal's strength is measured in dB and calculated as 10log10(P2/P1), where P1 and P2 are the powers of the signal at two points. If the dB value is negative, then the signal is attenuated. If the dB value is positive, then the signal is amplified.

Let us take an example. A signal travels through the transmission medium, and its power is reduced to one-half, then one can calculate the dB value as dB = 10 log10 [(P1/2)/P1] = -3 dB It means the signal is attenuated by 3 dB.

We can also add the dB numbers. Therefore, one can calculate the dB value between two points by adding the dB values at several points. To understand this, let us take the transmission medium where the signal is first attenuated by 3 dB, then amplified by 7 dB. Finally, it is attenuated by 3 dB. One can find the resultant dB value for the signal between points A and D by adding the dB values between each set of intermediate points. It comes out to be 1 dB. It means the signal has gained power as it moves from point A to point D.

[globalhappenings]

Istat: GDP forecast at + 6.3% in 2021 and + 4.7% in 2022

Istat: GDP forecast at + 6.3% in 2021 and + 4.7% in 2022

(ANSA) – ROME, DECEMBER 03 – In the two-year period 2021-2022 a sustained growth of the Italian GDP is expected: + 6.3% this year and + 4.7% next. This was announced by Istat in its Report on the prospects for the Italian economy in 2021-2022. Investments will support the recovery with greater intensity this year (+ 15.7%) than in 2022 (+ 7.5%). Consumption by resident families and ISPs will also…

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[china-tscom]

Fiber Optical Attenuator

https://www.china-tscom.com/products/fiber-optic-attenuator.html

Optical fiber communication attenuator is composed of attenuation optical fiber,  attenuator kits, connector kits and cables, Attenuator is used to attenuate input power on optical path to avoid signal distortion at optical receiving end due to excessive input optical power; or used for debugging optical power performance in optical communication system, calibration and correction of optical fiber instrument, and attenuation of optical fiber signal. The products are made of attenuation optical fiber doped with metal ions, and they are able to  adjust the optical power to the required level.