English Posts

A PIN diode (p-type, intrinsic, n-type diode) is a diode with a wide region of intrinsic semiconductor material (undoped) contained between a p-type semiconductor and an n-type semiconductor. The advantage of a PIN diode is that the depletion region exists almost completely within the intrinsic region, which has a constant …

A Crookes tube is an early experimental electrical discharge tube, with vacuum, invented by English physicist William Crookes and others around 1869-1875, in which cathode rays, streams of electrons, were discovered. Developed from the earlier Geissler tube, the Crookes tube consists of a partially evacuated glass bulb of various shapes, with two …

What made by Rutherford and his assistants Geiger and Marsden is perhaps one of the most important experiments of nuclear physics. The experiments were performed between 1908 and 1913 by Hans Geiger and Ernest Marsden under the direction of Ernest Rutherford at the Physical Laboratories of the University of Manchester. …

A ferrofluid is a material that belongs to the category of nanostructured materials: it is actually a colloidal solution containing ferromagnetic nanoparticles. For this characteristic it behaves like a magnet, but a liquid magnet! From Wikipedia : a ferrofluid is a liquid that becomes strongly magnetized in the presence of a magnetic …

With Theremino, with the component AD8232 and the software SignalScope you can easily build a small amateur electrocardiograph. In this post we will describe this equipment and show some examples of the charts that can be obtained. Electrocardiogram In general terms, the electrocardiogram is a graphic representation of the electrical activity …

Introduction A typical situation in which comes in the Poisson distribution is the study of a process of radioactive decay. In this circumstance, the number of trials is made by the number of nuclei that potentially may decay and is very large (for one mole of radioactive material the number …

Introduction When a β-particle (energetic electron from nuclear decay) enters a material its path can be deflected when it interacts with the nuclei of the material. The β-particles are oppositely charged to the positively charged nucleus and thus an attractive force exists between the two. The deflections that result are dependent …

This experiment was first explained by Austen and Brouwer (1997). It can be used to show how the air has naturally low levels of radioactive material in it, and that this decays over time. It is also a demonstration that our environment has low levels of radioactivity, mainly due to the …

Introduction With neutrons we enter the “heart” of nuclear physics. As known it is a sub-atomic particles contained in the nucleus, they are characterized by a mass slightly superior to that of the proton and neutral charge. Outside the nucleus, neutrons are unstable and have a half-life of about 15 minutes. …

What is NDVI Index ? (Contribute from Alessio Giusti @flybri) Live green plants absorb solar radiation in the photosynthetically active radiation (PAR) spectral region, which they use as a source of energy in the process of photosynthesis. Leaf cells have also evolved to re-emit solar radiation in the near-infrared spectral …