Electronics learning books uk,family disaster management kit singapore,emi rfi shielding conduit 50mm - Downloads 2016

We are the authors of the book “Exploring Quantum Physics through Hands-On Projects,” which will help you understand Quantum Physics through hands-on experiments that you can conduct at school or at home! Our book will guide you in the construction and use of setups to reproduce the key experiments that have brought us to our current understanding of the quantum world. The projects range from simple measurements of Planck’s constant all the way to testing violations of Bell’s inequalities using entangled photons. Teachers, instructors, and professors at accredited higher-learning institutions may request an evaluation copy of the book from J.
Our book explains Quantum Physics through hands-on experiments that the reader can perform at school. Andrew Gliesman sent me these pictures of his DOLPi Visor replication along with a very kind note.
THE nuclear magnetic resonance (NMR) absorption in ferromagnetic materials is tremendously enhanced compared with that in all other substances. All that is required to observe the resonance is some powdered cobalt, and a low-powered rf oscillator equipped with a meter which indicates grid current, i.e. The 213.1-Mc resonance arises from nuclei of atoms located in the abundant face-centered cubic crystal structure.
A grid dip meter is normally coupled weakly to the circuit under test, in order to avoid mutual detuning, and the frequency dial is calibrated accordingly.
3 See any recent edition of the annual Radio Amateur’s Handbook (American Radio Relay League, West Hartford, Connecticut). Her lecture has been uploaded by Hackaday and is available now available online.  CLICK HERE for the link to the HaD Blog and Video.
The DOLPi project involved the development and construction of two low-cost polarimetric camera types based on the Raspberry Pi 2. CLICK HERE for a complete project description including detailed construction instructions and Python code in pdf format.


Hack-a-Day just announced the finalists for the 2015 Prize, and DOLPi is one of them!  Hack-a-Day Prize 2015 Finalists for the announcement. In reality, the LCP driven half-way acts as a quarter-wave plate, and hence the strict interpretation of the analysis at this level is for circular polarization rather than linear polarization at 45 degrees.
This weekend I decided to build a mechanical filter-wheel-based polarimetric camera to serve as a basis for comparison to the LCP_based DOLPi.
As you can see above, positive voltage must be applied across the LED from its anode to its cathode. Importantly, all of the experimental equipment can be built out of relatively inexpensive materials that are readily available at the hardware store or from on-line vendors of electronic surplus.
The project descriptions are targeted to an audience with basic experience in electronic prototype construction. Throughout the book we guide the reader in the construction and use of setups to reproduce the key experiments that have brought us to our current understanding of the quantum world.
By far the most intense NMR absorption yet reported is that of the Co59 nucleus in bulk cobalt.1• 2 At room temperature, the internal magnetic field at the cobalt nucleus is about 210 kG. Nuclei of atoms in the less abundant hexagonal closepacked structure see a slightly larger magnetic field, and therefore resonate at about 221 Mc. The proximity of the bulk cobalt to the hairpin has two gross effects on the grid dip meter, in addition to providing resonant absorption of nuclear origin. The sample used in the present work was 300 mesh, assay 98% minimum, Ni 0.6%, obtained from the Fisher Scientific Company (catalog number C363). DOLPi-MECH (and its productized IR-VIS-UV version DOLPi-UI) is a filter-wheel-type camera capable of performing full Stokes analysis, while the electro-optic based DOLPi-EO camera performs full linear polarimetric analysis at higher frame rate. This camera is much slower than the LCP-based DOLPi because of the mechanical switching of filters, but it provides the data necessary for complete Stokes imaging (including the fourth Stokes parameter describing circular polarization). Importantly, all of the experimental equipment can be built by the reader out of relatively inexpensive materials that are readily available at the hardware store or from on-line vendors of electronic surplus.


The nuclei precess in this field at 213.1 Mc, and will absorb energy at this frequency from an rf oscillator coupled to the cobalt sample.
When energy is absorbed from the tuned circuit of the oscillator by a nearby resonant circuit, the grid current shows a dip. 5 If a little cobalt is placed just inside the curved end of the hairpin, the 213.1-Mc absorption dip will become stronger, and it should then be possible to discern the 221-Mc absorption as well.
Firstly, the added stray capacitance reduces the oscillation frequency by roughly 5 to 10% below that indicated on the dial. The H-bridge produces a continuous biphasic train at a frequency given by the oscillator built around U3A and U3B. No external magnetic field need be applied to the cobalt; a strong external field will in fact destroy the resonance. With a model 59 Megacycle Meter,4 the curved end of the tuning hairpin need only be held flat against the bottom of the bottle of cobalt. Some weaker resonances are also present, but additional equipment is usually needed to see them. Thus, to obtain oscillation at 213.1 Mc when the cobalt is in place, the dial has to be set at some higher reading.
Various applications for the cameras are described, especially their use for locating mines and unexploded ordinance in humanitarian demining operations. As the oscillator is tuned carefully through 213.1 Mc, a small clip of grid current will be observed.
6 Secondly, resistive loading of the oscillator reduces the amplitude of the rf oscillation, and may stop it entirely if too much cobalt is brought too close.



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