#attenuation

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.…

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.…

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

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.…

Fermentation is a crucial part of the beer brewing process that transforms wort into beer. During fermentation, yeast consumes the sugars in the wort and produces alcohol and carbon dioxide. The temperature at which fermentation occurs can have a significant impact on the flavor and aroma of the finished beer. In this article, we will discuss how to monitor and control fermentation temperature…

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.

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…