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Direct Sequence Spread

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Frequency Hopping Spread Spectrum (FHSS)

sorin-schwartz.com

Two main Spread Spectrum modulation techniques are defined: Frequency Hopping Spread Spectrum (FHSS) and Direct Sequence Spread Spectrum (DSSS). By transmitting the message energy over a bandwidth much wider than the minimum required, Spread Spectrum modulation techniques present two major advantages: low power density and redundancy.

  Spectrum, Direct, Frequency, Sequence, Spreads, Hopping, Frequency hopping spread spectrum, Direct sequence spread

Personal Protective Equipment (PPE) 102

www.cdc.gov

that can be spread by contact with the patient’s skin including mucous membranes, feces, vomit, urine, wound drainage or other body fluids. These are examples of coming into direct contact with the patient. Indirect contact occurs when health care personnel are in the patient’s environment or surroundings that may be contaminated.

  Direct, Spreads

Conjugate Gradient Method - Stanford University

stanford.edu

• proposed by Hestenes and Stiefel in 1952 (as direct method) • solves SPD system Ax = b – in theory (i.e., exact arithmetic) in n iterations – each iteration requires a few inner products in Rn, and one matrix-vector multiply z → Az • for A dense, matrix-vector multiply z → Az costs n2, so total cost is n3, same as direct methods

  Direct, Conjugate, Derating, Conjugate gradient

SAFETY DATA SHEET - Airgas

www.airgas.com

Store in original container protected from direct sunlight in a dry, cool and well-ventilated area, away from incompatible materials (see Section 10) and food and drink. Eliminate all ignition sources. Separate from oxidizing materials. Keep container tightly closed and sealed until ready for use. Containers that have been opened must be carefully

  Direct, Airgas

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