In short, a HARApad is a lightweight pad designed to protect your body against the effects of heat and electromagnetic radiation emitted by laptop computers, tablets, or cell phones. The HARApad for laptops allows you to enjoy a sturdy surface for your laptop while relaxing on the couch or on the go.
Our cell phone product provides a shield between your cell phone and your body when placing your phone in your pocket or bra.
The tablet HARApad provides a beautiful leather case for your iPad that also protects you from EMF.
The HARApad uses lead and tungsten-free, military-grade electromagnetic radiation shielding to attract the extremely low frequency (ELF) radiation emitted by laptop computers. Protects against electromagnetic radiation through lead and tungsten-free, military-grade electromagnetic radiation shielding. Hard X-rays can penetrate solid objects, and their largest use is to take images of the inside of objects in diagnostic radiography and crystallography. The roentgen (R) is an obsolete traditional unit of exposure, which represented the amount of radiation required to create one electrostatic unit of charge of each polarity in one cubic centimeter of dry air. The rad is the (obsolete) corresponding traditional unit, equal to 10 millijoules of energy deposited per kilogram.
The sievert (Sv) is the SI unit of equivalent dose, which for X-rays is numerically equal to the gray (Gy). X-rays are generated by an X-ray tube, a vacuum tube that uses a high voltage to accelerate the electrons released by a hot cathode to a high velocity. In crystallography, a copper target is most common, with cobalt often being used when fluorescence from iron content in the sample might otherwise present a problem. X-ray fluorescence: If the electron has enough energy it can knock an orbital electron out of the inner electron shell of a metal atom, and as a result electrons from higher energy levels then fill up the vacancy and X-ray photons are emitted. So the resulting output of a tube consists of a continuous bremsstrahlung spectrum falling off to zero at the tube voltage, plus several spikes at the characteristic lines. In medical diagnostic applications, the low energy (soft) X-rays are unwanted, since they are totally absorbed by the body, increasing the dose.
To generate an image of the cardiovascular system, including the arteries and veins (angiography) an initial image is taken of the anatomical region of interest. A specialized source of X-rays which is becoming widely used in research is synchrotron radiation, which is generated by particle accelerators. The most commonly known methods are photographic plates, photographic film in cassettes, and rare earth screens.
Before the advent of the digital computer and before invention of digital imaging, photographic plates were used to produce most radiographic images. Since photographic plates are sensitive to X-rays, they provide a means of recording the image, but they also required much X-ray exposure (to the patient), hence intensifying screens were devised.
Areas where the X-rays strike darken when developed, causing bones to appear lighter than the surrounding soft tissue. Contrast compounds containing barium or iodine, which are radiopaque, can be ingested in the gastrointestinal tract (barium) or injected in the artery or veins to highlight these vessels. An increasingly common method is the use of photostimulated luminescence (PSL), pioneered by Fuji in the 1980s. The PSP plate can be reused, and existing X-ray equipment requires no modification to use them. For many applications, counters are not sealed but are constantly fed with purified gas, thus reducing problems of contamination or gas aging. Some materials such as sodium iodide (NaI) can "convert" an X-ray photon to a visible photon; an electronic detector can be built by adding a photomultiplier.
Extensive selection of conductive and shielding fabrics.Variations of corrosion resistance, weight, color, bio-compatibility. In particular Sulphur, high Fluoride, and low pH will react strongly with Silver and destroy conductivity and shielding performance. Washing will eventually degrade all fabrics with Silver fibers and reduce shielding performance.
If you require un-creased materials for your application, please add the "roll charge" option and we will ship your fabric rolled on a core.
Minors defects (such as small pulls, small holes, or minor discolorations) are a natural part of the production of these high tech fabrics. Special recipe detergent preserves the shielding performance, saves the environment and is suitable for many allergy sufferers. After many years of experience with shielding fabrics we found out that some laundry detergents are bad for the shielding attenuation.


It contains no fragrances, coloring agents, complexing agents, preservatives, enzymes, genetic engineering, petrochemicals, and all ingredients are 100 % biodegradable.
6-foot long ground cord, alligator clip on one end bites onto fabric, 3-prong-style plug on the other end plugs easily into your grounded outlet.
With this conductive thread, you can add conductivity to any fabric, make conductive traces as easily as sewing, even use it as un-insulated low voltage wiring. With conductive thread, you can add conductivity to any fabric, make conductive traces as easily as sewing, even use it as uninsulated low voltage wiring.
This flexible polymer exhibits extraordinary electrical resistance change when deformed by squeezing, pulling or twisting. It is claimed that electrons ‘pass’ through the insulation by a process called quantum tunneling. QTC™ can be used as a solid state switch - in the "off" state it is a good insulator and in the "on" state it is as good as a metal conductor.
Engineers know that you can measure surface resistivity from one point on the surface to another using an ordinary ohm-meter. More consistent results are obtained by measuring the surface resistivity between two bars. The HARApad not only protects your body from electromagnetic radiation, it prevents overheating while your computer is on your lap. The shielding creates a path of least resistance for the radiation to travel, allowing it to flow through the HARApad, instead of your body, and then back to the laptop to complete the path away from your body. If for any reason you are not happy with your purchase, simply notify us and we'll issue a refund. This process produces an emission spectrum of X-ray frequencies, sometimes referred to as the spectral lines. The intensity of the X-rays increases linearly with decreasing frequency, from zero at the energy of the incident electrons, the voltage on the X-ray tube. A second image is then taken of the same region after iodinated contrast material has been injected into the blood vessels within this area.
The contrast compounds have high atomic numbered elements in them that (like bone) essentially block the X-rays and hence the once hollow organ or vessel can be more readily seen. In modern hospitals a photostimulable phosphor plate (PSP plate) is used in place of the photographic plate.
In addition, customers who suffer from MCS (Multiple Chemical Sensitivity syndrome) reported some brands cause an undesirable odor.
This nontoxic, solvent free and water soluble material spreads easily and dries quickly to form a conductive bond between most surfaces. In-house samples demonstrate that the material can last years if treated properly and kept dry. In practice, QTC™ can be connected in quite simple ways to create anything from switches to force sensors. In classical physics, the electrons cannot pass through an insulating barrier, but according to quantum theory a wave can – and this is what happens in QTC™.
It can be used to detect even very small changes due to compression, tension or other stresses and it can carry significant currents allowing for the direct control of loads. This soft 39 inch fabric potentiometer is perfect for controlling the brightness of an LED or the changing the tone of a buzzer to make cool sound effects. Conductivity is important for joining shields, connecting ground cords, and determining if the material will be good for Earthing. For simplicity, two parallel bars of equal length are placed exactly 1 length apart on the surface to be measured. The HARApad’s flat surface allows your laptop’s own dissipation channels to permit air to freely flow out of the computer.
The spectral lines generated depend on the target (anode) element used and thus are called characteristic lines. These two images are then digitally subtracted, leaving an image of only the iodinated contrast outlining the blood vessels.
Photographic film largely replaced these plates, and it was used in X-ray laboratories to produce medical images.
In the pursuit of a non-toxic contrast material, many types of high atomic number elements were evaluated. After the plate is X-rayed, excited electrons in the phosphor material remain "trapped" in "colour centres" in the crystal lattice until stimulated by a laser beam passed over the plate surface. Electrons accelerate toward the anode, in the process causing further ionization along their trajectory.


In this booklet you get swatches of each fabric, along with specifications and application suggestions.
This new laundry detergent, developed in cooperation with a prestigious manufacturer of eco-detergents, will not react with our Silver or stainless steel shielding fabrics which are washable. Just squeeze a little bit onto your fabric, embed the bare copper wire lead into it and wait about an hour. Also can be used to create conductive pathways on surfaces or add shielding to cables and flexible conduits.
In its normal, uncompressed state, QTC acts as a near perfect insulator, but as it is gradually compressed it will allow more current through until it is nearly a perfect conductor.
Another way of describing the quantum tunneling effect is to say that a non-zero probability exists of electrons one side of the insulation barrier appearing on the other side. Kit includes 1 meter of knitted conductive tape, instructions for a simple circuit using a Lilypad Arduino (not included), and a metal ring.
But this method yields very inconsistent results, especially with surfaces that are not perfectly homogeneous. The radiologist or surgeon then compares the image obtained to normal anatomical images to determine if there is any damage or blockage of the vessel. In more recent years, computerized and digital radiography has been replacing photographic film in medical and dental applications, though film technology remains in widespread use in industrial radiography processes (e.g. For example, the first time the forefathers used contrast it was chalk, and was used on a cadaver's vessels. This process, known as a Townsend avalanche, is detected as a sudden current, called a "count" or "event". Use it to create re-sealable flaps, tubes, and seams in shielding fabrics, plastics and foils. Fun to experiment with and great for turning anything with a screw-in battery compartment into an effective dimmer switch!
It doesn't matter how long the bars are, since longer bars will be placed proportionally further apart. You can see the phone, press the keys, hang up, fold up, recharge and operate your phone normally. When the film is developed, the parts of the image corresponding to higher X-ray exposure are dark, leaving a white shadow of bones on the film.
Note that Electric Paint is water soluble, washing with soap and water will remove any paint which has been applied. The conductivity of Electric Paint increases as it dries, therefore wait until it is completely dry to test your projects. Can also be used between layers of conductive fabric to make variable switches and variable resistors or capacitors. This handy meter uses two parallel 2” conductive rods, mounted right on the back of the meter to make solid contact with the surface you are testing. The resistance measured between the two bars in Ohms is the resistivity of the surface in Ohms per square! Photographic plates are mostly things of history, and their replacement, the "intensifying screen", is also fading into history.
If you need larger pieces for your testing, you can order as little as 1 linear foot of any material (see above). If you want to make it more durable, you can use waterproofing spray to protect the surface of the fabric. The metal silver (formerly necessary to the radiographic & photographic industries) is a non-renewable resource. Silver kills a number of bacteria, including those that cause odor, has excellent thermal properties, is nontoxic and is perfect for those suffering from diabetes, arthritis and sensitive skin. Thus it is beneficial that this is now being replaced by digital (DR) and computed (CR) technology. Silver also allows Smartphone or other touch screen use while wearing gloves knit from the yarn. Where photographic films required wet processing facilities, these new technologies do not. Display also says one of the following: CONDUCTIVE, STATIC DISSIPATIVE, INSULATIVE, so there is no question about what the numbers mean.



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