Data Storage and Recording

Various experimental modifications have been made to the process over the years to produce y-Fc203 particles that have the required shape and uniformity for use as magnetic media. The y-Fe203 

The process for producing chromium dioxide (Cr02) particles for magnetic media was developed by the DuPont Company in the 1960s. Because of the higher uniformity in size and shape of the particles Cr02 tends to have a 

The name maghemite was first suggested in 1927. It is a combination of the first syllables of magnetite, which has the same structure, and hemaiite, which has the same composition.  

But the main drawback that prevented its more widespread use in audiotapes is that it is more expensive than y-Fe203. 

Ferrites can be used to store a considerable amount of information, but in many applications are being replaced by optical information storage such as CDs and DVDs. 

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Pulsed-force mode AFM (PFM-AFM) is a method introduced for fast mapping of local stiffness and adliesion with lower required data storage than recording force-distance curves at each point on the x-y plane [115]. A sinusoidal or triangular modulation is applied between the tip and sample (either via lever or sample piezo) at a lower frequency than that of either the piezo or cantilever resonance frequency. Tip and sample then come... 

CD-XA (CD-extended architecture) is the standard for CD-ROMs for data storage and compressed audio recording (up to four hours music in HiFi-stereo quaUty). The definition of the CD-XA format is also put down in the extended Yellow Book. 

Data handUng and record keeping Distribution and storage... 

Controlled Access. Access to the physical archives (e.g., file cabinets and freezers) is controlled by locks and the archive management. Access to electronic files is controlled by secret user identification (ID) numbers. Well designed electronic data storage software records or stores the ID number of any user that enters or changes data and when that entry or change occurred. 

It may take years for a company to compile and submit a regulatory package of completed studies in support of an application. Thus, data storage and retrieval are important. All raw data, documentation, records, protocols, specimens, and final reports generated as a result of a study should be retained. Specimens obtained from mutagenicity tests, specimens of soil, water, and plants, and wet specimens of blood, urine, feces, and biologic fluids, need not be retained after QA verification.6-8... 

Photochromic materials have been developed in order to dramatically increase the memory density. These materials can be used for photon-mode recording, which is based on the photochemical reaction of the medium. In photon-mode recording, light characteristics such as wavelength, polarization, and phase can be multiplexed in data storage and thus can, in a potentially dramatic ways, increase the memory density. 

All the systems discussed here use conventional strip chart recorders for recording the photometer or colorimeter output, and the resulting record is a conventional histogram in which the absorbance of the eluate or eluate-reagent reaction mixture is recorded as a function of time. In addition, some prototype systems of the UV- and carbohydrate analyzers use on-line computers for data storage and processing (Cl, S7). 

Externa] control On-line recording Data storage and treatment Graphical presentation... 

The security of the data must be provided by a three-level storage system (a) storage of the data in the independent data storage units of the recorders, for example, a TS recorder at one particular level, (b) storage of all data in the central platform data storage, and (c) online transmission of the data via satellite every hour. 

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