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| {{Orphan|date=May 2011}}
| | Possessing healthier skin is not hard if you have access to the correct information. A great skin care regimen leads to beautiful seeking skin. It really is important to know what wants to be completed to attain healthy skin. The following ideas give directions for great skin care.<br><br>Make your personal mask to aid with breakouts. Right after you wash your face use a raw egg-white and spread it all over your face. The egg-white will dry and tighten on your face. It will clean out your pores and support close them up. If people choose to discover more about [http://www.nerium.com/contourcream.aspx?ID=direct look into nerium firm lotion], we know of many libraries you could investigate. You can also use clay-dirt as a mask.<br><br>One particular of the very best things that you can do to kill the bacteria on the surface of your skin is to use a cleanser that is rich in benzyl peroxide. This ingredient is a powerful element in your battle against acne and if used cautiously can clean your skin whilst simultaneously preventing future breakouts.<br><br>Attempt consuming watercress for decreasing inflammation, pore size, and puffiness. Watercress will also assist minimize pore size as effectively as numerous other optimistic wellness effects. Watercress is as good for your whole body as it is for your skin.<br><br>Sunscreen is an essential tool for wonderful skin. If you are 1 of the a lot of individuals who stay away from this step in skin care due to the fact of the greasy look and really feel of sunscreen, making use of a sponge to apply it may possibly make it a small simpler. When you apply sunscreen with a sponge, it absorbs into your skin more quickly rather of sitting on the surface.<br><br>Chapped lips can be a sign that you are not receiving adequate water. It may take a couple of days of enhanced water intake to see improvement. Keep away from going overboard with lip balm -- as well much can in fact irritate your lips, producing the issue worse. Get more on [http://www.nerium.com/Opportunity.aspx?ID=direct analyze how do you get paid with nerium] by browsing our fresh paper. Some components in lipsticks can be allergens, yet another supply of chapped lips. You could see improvement making use of a distinct brand.<br><br>In the final few months of pregnancy and right away following, numerous women endure from unsightly broken capillaries on the face. Dab on a small quantity of rose oil when or twice day-to-day to affected regions. Rose oil reduces the redness by constricting modest blood vessels just beneath the surface of the skin.<br><br>When you are placing on hand cream, don"t forget to put a bit of lotion on your elbows. This easy step can aid your elbows to look greater and really feel softer. A small bit of lotion goes a lengthy way on the elbows. Do not overlook this part of your physique, due to the fact elbows need to have enjoy, also.<br><br>Cleanliness is subsequent to godliness in skin care. As you sweat, you are covering your physique in a film of sebum. This tends to make for a perfect breeding ground for bacteria. Discover more on [http://www.nerium.com/contourcream.aspx?ID=direct nerium firm complaints] by navigating to our engaging article directory. As this is their primary food supply, it tends to make the ultimate location for them to infest and spread, causing you to break out.<br><br>If you apply the recommendations from this report, you will be much more prepared to create an powerful skin care routine. Clear, glowing skin shows the inner health of your physique. That tends to make skin care quite essential..<br><br>If you loved this article so you would like to receive more info about [http://politicalmishap56.snappages.com compare health insurance plans] generously visit the web-site. |
| {{copy edit|date=June 2013}}
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| A '''MEMS Magnetic Actuator''' is a device that uses the [[Microelectromechanical systems|MEMS process technology]] to convert an electrical signal (current) into a mechanical output (displacement) by employing the well known [[Lorentz force|Lorentz Force Equation]] or the theory of [[Magnetism]].
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| ==Overview of MEMS==
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| Micro-Electro-Mechanical System (MEMS) Technology<ref>{{cite book|last=Senturia,|first=S.|title=Microsystems Design}}</ref> is a process technology in which mechanical and electro-mechanical devices and structures are constructed using special [[Microfabrication|Micro-fabrication Techniques]]. These Techniques include: Bulk Micro-Machining, Surface Micro-Machining, LIGA, Wafer Bonding etc.
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| <br/>A device is considered to be a MEMS device if it satisfies the following: | |
| * If its feature size is between 0.1 [[µm]] and hundreds of micrometers. (below this range, it becomes a nano device and above the range, it is considered a mesosystem)
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| * If it has some Electrical functionality in its operation. This could include the generation of voltage by Electromagnetic Induction, by changing the gap between 2 electrodes or by a piezoelectric material.
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| * If the device has some mechanical functionality such as the deformation of a beam or diaphragm due to stress or strain.
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| * If it has a system-like functionality. The device must be integrable to other circuitries to form system. This would be the interfacing circuitry and packaging for the device to become useful.
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| <br/> For the analysis of every MEMS device, the Lumped assumption is made: that if the size of the device is far less than the characteristic length scale of the phenomenon (wave or Diffusion), then there would be no spatial variations across the entire device. Modelling becomes easy under this assumption.<br/><ref>{{cite book|last=Arnold,|first=D .|title=Lecture Notes on MEMS Transducers,|year=Fall 2010 & Spring 2011}}</ref>
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| [[Image:Lumped Assumption.jpg|thumb|right|300px|The Lumped Assumption]]<br/>
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| [[Image:MEMS dimensions.jpg|thumb|left|300px|MEMS scale of dimensions]]
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| ===Operations in MEMS===
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| The three major operations in MEMS are:
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| * Sensing: measuring a mechanical input by converting it to an electrical signal e.g. A MEMS Accelerometer or A Pressure Sensor. (could also measure electrical signals as in the case of Current Sensors)
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| * Actuation: using an electrical signal to cause the displacement (or rotation) of a mechanical structure e.g. A synthetic Jet Actuator.
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| * Power Generation: generates power from a mechanical input e.g. MEMS Energy Harvesters
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| <br/> | |
| These three operations require some form of transduction schemes, the most popular ones being: piezoelectric, electrostatic, piezoresistive, electrodynamic, Magnetic and Magnetostrictive. The MEMS Magnetic actuators use the last three schemes for their operation.
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| ==Magnetic Actuation==
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| The principle of Magnetic Actuation is based on the Lorentz Force Equation.
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| :<math>\vec F_{mag} = q\vec v \times B</math>
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| When a current-carrying Conductor is placed in a static magnetic field, the field produced around the conductor interacts with the static field to produce a force. This Force can be used to cause the displacement of a mechanical structure.
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| [[Image:Magnetic Actuation.jpg|thumb|right|300px|Magnetic Actuation]]
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| ===Governing Equations and Parameters===
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| A typical MEMS actuator is shown on the right. For a single turn of circular coil, the equations that govern its operation are:<ref>{{cite journal|last=Wagner,|first=B.|coauthors=w. Benecke,|title=Microfabricated Actuator with moving Permanent Magnet}}</ref>
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| * The H-field from a circular conductor:
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| :<math>H(z)=\frac{Ir^2}{2(r^2+z^2)^{3/2} }</math>
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| * The Force produced by the interaction of the flux densities:
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| :<math>F_z=B_IA_{mag}\int_z^{z+h_{mag} } \frac{dHz}{dz}dz</math>
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| The deflection of a mechanical structure for actuation depends on certain parameters of the device. For actuation, there has to be an applied force and a restoring force. The applied force is the force represented by the equation above while the restoring force is fixed by the Spring constant of the moving structure.
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| The Applied force depends on both the field from the coils and the Magnet. The remanence value of the magnet,<ref>{{cite journal|last=Dodrill,|first=B. C.|coauthors=B. J. Kelley|title=Measurement with a VSM – Permanent Magnet Materials}}</ref> its volume and position from the coils all contribute to its effect on the Applied Force. Whereas the number of turns of coil, its size (radius) and the amount of current passing through it determines its effect on the Applied Force. The Spring constant depends on the Young's Modulus of the moving structure, and its length, width and thickness.
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| [[Image:Parameters1.jpg|center|400px]]
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| ==Magnetostrictive Actuators==
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| Magnetic Actuation is not limited to the use of Lorentz force to cause a mechanical displacement. Magnetostrictive actuators can also use the theory of Magnetism to bring about displacement. Materials that change their shapes when exposed to magnetic fields can now be used to drive high-reliability linear motors and actuators.. <br/>An example is a Nickel rod that tends to deform when it is placed in an external magnetic field. Another example is wrapping a series of electromagnetic induction coils around a metal tube in which a Terfenol-D material is placed. The coils generate a moving magnetic field that courses wavelike down the successive windings along the stator tube. As the traveling magnetic field causes each succeeding cross section of Terfenol-D to elongate, then contract when the field is removed, the rod will actually "crawl" down the stator tube like a worm. Repeated propagating waves of magnetic flux will translate the rod down the tube's length, producing a useful stroke and force output. The amount of motion generated by the material is proportional to the magnetic field provided by the coil system, which is a function of the electrical current. This type of motive device, which features a single moving part, is called an elastic-wave or peristaltic linear motor.
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| [http://www.youtube.com/watch?v=1WWS_XZCjTU Video of a Magnetostrictive micro walker] | |
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| ==Advantages of Magnetic Actuators==
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| * High actuation force and stoke (displacement)
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| * Direct, fully linear transduction (in the case of electrodynamic actuation)
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| * Bi-directional actuation
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| * Contactless remote actuation
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| * Low voltage actuation
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| * A figure of merit for actuators is the density of field energy that can be stored in the gap between the rotor and stator. Magnetic Actuation has a potentially high energy density<ref>{{cite journal|last=Arnold ,|first=D.|title=Permanent Magnets for MEMS}}</ref>
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| ==Magnet Material==
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| [[Image:Materialsm.jpg|thumb|right|500px|Magnet Material Selection for Static B-Field]]
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| The operation of the Magnetic Actuator depends on the interaction between the field from an electromagnet and a static field. To produce this static field, it is important to use the right material. In MEMS, [[Magnet|Permanent Magnets]] have become the favorite because they have a very good scaling factor and they retain their magnetization even when there is no external field...meaning that they need not be continuously magnetized when they are in use<ref>{{cite journal|last=Gibbs1,|first=M R J|coauthors=E W Hill2 and P J Wright,|title=Magnetic Materials for MEMS Applications}}</ref><ref>{{cite journal|last=National Imports LLC,|title=Permanent Magnet Selection and Design Handbook}}</ref><ref>{{cite journal|last=Arnold ,|first=D.|title=Permanent Magnets for MEMS}}</ref><ref>{{cite journal|last=Wang,|first=N.|title=Fabrication and Integration of Permanent Magnet Materials into MEMS Transducers}}</ref><ref>{{cite journal|last=Arnold|first=David|title=Permanent magnets for MEMS}}</ref>
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| ==Integrating the Magnet into the MEMS device==
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| As earlier discussed, MEMS devices are designed and fabricated using special micro-fabrication techniques. The major challenge however for Magnetic MEMS is the integration of the Magnet into the MEMS device.<ref>{{cite journal|last=Chin,|first=Tsung-Shune|title=Permanent magnet films for applications in Micro-electro-mechanical systems}}</ref> Recent research have suggested solutions to this challenge.
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| ===Fabrication (or Molding)of the Magnet===
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| There are several ways by which the magnet could be fabricated on a MEMS structure:
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| [[Image:Sputtering1.jpg|thumb|200px|right|Sputtering]]
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| * Sputtering: Argon ion bombardment of the material release particles of the material.Mainly for depositing rare earth magnets. Deposition rate and film surface area depend on sputtering tool and target size
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| [[Image:PLD.jpg|thumb|center|200px|Pulsed Layer Deposition]] | |
| * Pulsed Layer Deposition: a high power pulsed laser beam is focused inside a vacuum chamber to strike a target of the material that is to be deposited
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| * Electroplating
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| * Screen Printing
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| * Wax/Parylene Bonding<ref>{{cite journal|last=Arnold,|first=D.|coauthors=B. Bowers, N. Wang,|title=Wax-bonded NdFeB micromagnets for microelectromechanical systems applications}}</ref><ref>{{cite journal|last=Wang,|first=N.|title=Fabrication and Integration of Permanent Magnet Materials into MEMS Transducers}}</ref><ref>{{cite journal|last=Yang,|first=Tzu-Shun|coauthors=Naigang Wang, and David P. Arnold ,|title=Fabrication and characterization of parylene-bonded Nd–Fe–B powder micromagnets}}</ref>
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| ===Issues with Magnetic Actuation===
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| * High power dissipation. (This is a big problem for Magnetic MEMS) but work is underway to circumvent this.<ref>{{cite journal|last=Guckel,|first=H.|title=Progress in Magnetic Microactuators}}</ref>
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| * Fabrication of the coil
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| * Integration of the micromagnet into the MEMS device
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| * Process-material compatibility
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| * Integratability into the overall microfabrication process (maintain cost and throughput)
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| * So that preexisting processes in the fabrication of the MEMS device will not be tampered with, deposition temperatures and postdepostion treatment/conditions must be tolerable. Also, the micromagnet must be able to withstand any chemical treatment that will come after its deposition
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| * Issues with magnetization (One may want to have more than one direction of Magnetization. This creates a problem)<ref>{{cite journal|last=Gatzen,|first=Hans H.|title=Advances in European Magnetic MEMS Technology}}</ref>
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| Each of these challenges can be mitigated or lessened by the right choice of material, choice of molding or fabrication method and the type of device that is to be constructed.
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| Applications of the Magnetic Actuator include the synthetic Jet actuator, Micro pumps and micro relays.
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| ==References==
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| <references/>
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| <!--- After listing your sources please cite them using inline citations and place them after the information they cite. Please see http://en.wikipedia.org/wiki/Wikipedia:REFB for instructions on how to add citations. --->
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| [[Category:Actuators]]
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One particular of the very best things that you can do to kill the bacteria on the surface of your skin is to use a cleanser that is rich in benzyl peroxide. This ingredient is a powerful element in your battle against acne and if used cautiously can clean your skin whilst simultaneously preventing future breakouts.
Attempt consuming watercress for decreasing inflammation, pore size, and puffiness. Watercress will also assist minimize pore size as effectively as numerous other optimistic wellness effects. Watercress is as good for your whole body as it is for your skin.
Sunscreen is an essential tool for wonderful skin. If you are 1 of the a lot of individuals who stay away from this step in skin care due to the fact of the greasy look and really feel of sunscreen, making use of a sponge to apply it may possibly make it a small simpler. When you apply sunscreen with a sponge, it absorbs into your skin more quickly rather of sitting on the surface.
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