Thesis or Dissertation Abstract This work presents an investigation of various dielectric barrier discharge based aerodynamic plasma actuator designs, in order to make plasma actuators more efficient in the aerodynamic active flow control. Based on the electric wind generation schemes of the AC signal driven plasma actuator, two features intended to explore the controlling of the accumulated surface charges are introduced in the new plasma actuator design:
Having a Glossary meant I could reduce the text on most pages, while expanding background for the definitions, and relating the ideas to other similar, contradictory, or more basic ideas.
Why Bother with Definitions? The value of a definition is insight. Simple descriptions are not always possible. Terms have meaning within particular contexts. Tedious examples may be required to expose the full meaning.
Good definitions can expose assumptions and provide a basis for reasoning to larger conclusions. Consider the idea that cryptography is used to keep secrets: We expect a cipher to win each and every contest brought by anyone who wishes to expose secrets.
We call those people opponentsbut who are they really, and what can they do? In practice, we cannot know. Opponents operate in secret: We do not know their names, nor how many they are, nor where they work. We do not know what they know, nor their level of experience or resources, nor anything else about them.
Because we do not know our opponents, we also do not know what they can do, including whether they can break our ciphers. Unless we know these things that cannot be known, we cannot tell whether a particular cipher design will prevail in battle. We cannot expect to know when our cipher has failed.
Even though the entire reason for using cryptography is to protect secret information, it is by definition impossible to know whether a cipher can do that. Nobody can know whether a cipher is strong enough, no matter how well educated they are, or how experienced, or how well connected, because they would have to know the opponents best of all.
The definition of cryptography implies a contest between a cipher design and unknown opponents, and that means a successful outcome cannot be guaranteed by anyone. Sometimes the Significance is Implied Consider the cryptographer who says: First, the cryptographer has the great disadvantage of not being able to prove cipher strength, nor to even list every possible attack so they can be checked.
In contrast, the cryptanalyst might be able to actually demonstrate weakness, but only by dint of massive effort which may not succeed, and will not be compensated even if it does. Consequently, most criticisms will be extrapolations, possibly based on experience, and also possibly wrong.
The situation is inherently unbalanced, with a bias against the cryptographer's detailed and thought-out claims, and for mere handwave first-thoughts from anyone who deigns to comment. This is the ultimate conservative bias against anything new, and for the status quo. Supposedly the bias exists because if the cryptographer's claim is wrong user secrets might be exposed.
But the old status-quo ciphers are in that same position. Nothing about an old cipher makes it necessarily strong. Unfortunately, for users to benefit from cryptography they have to accept some strength argument.
Many years of trusted use do not testify about strength, but do provide both motive and time for opponents to develop secret attacks. Many failures to break a cipher do not imply it is strong. There can be no expertise on the strength of unbroken ciphers.
So on the one hand we need a cipher, and on the other have no way to know how strong the various ciphers are. For an industry, this is breathtakingly disturbing. In modern society we purchase things to help us in some way.
We go to the store, buy things, and they work. Or we notice the things do not work, and take them back.
We know to take things back because we can see the results.Electronics safety pages. General information. Compliance Engineering Product Safety Article Archive Rate this link Electronic Products Radiation Control - Consumer and Business Products Rate this link Exposure Limits / Conversion Tables - information on limits for electric and magnetic fields Rate this link Hazard Analysis: HIGH voltage & LOW current test electronics racks Rate this link.
INTENSITY CONTROL OF DIELECTRIC BARRIER DISCHARGE FILAMENTS by MATTHEW CRAWFORD PALIWODA A THESIS Presented to . Electrical discharge machining (EDM), also known as spark machining, spark eroding, burning, die sinking, wire burning or wire erosion, is a manufacturing process whereby a desired shape is obtained by using electrical discharges (sparks).
Material is removed from the work piece by a series of rapidly recurring current discharges between two electrodes, separated by a dielectric liquid and.
* Research Fellow ** Graduate Student *** Clarence L. "Kelly" Johnson Collegiate Professor and Chair Modeling of Dielectric Barrier Discharge Plasma Actuator. The Commodity Codes Search page lists all NIGP commodity codes and is searchable. This is the web site of the International DOI Foundation (IDF), a not-for-profit membership organization that is the governance and management body for the federation of Registration Agencies providing Digital Object Identifier (DOI) services and registration, and is the registration authority for the ISO standard (ISO ) for the DOI system.
The DOI system provides a technical and social.