Quadrature amplitude modulation (QAM) ([pic] /ˈkwɑːm/ or /ˈkæm/ or simply "Q-A-M") is both an analog and a digital modulation scheme. It conveys two analog message signals‚ or two digital bit streams‚ by changing (modulating) the amplitudes of two carrier waves‚ using the amplitude-shift keying (ASK) digital modulation scheme or amplitude modulation (AM) analog modulation scheme. The two carrier waves‚ usually sinusoids‚ are out of phase with each other by 90° and are thus called quadrature carriers
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difference between learning styles and learning modalities.[1] Learning styles: what do we know?[2] What are learning styles?[3] Learning styles are simply the way a child learns best.[4] Learning styles theory says that there are different learning modalities and that individuals have a preferred modality.[5] A consequence of this theory is that effective teaching should present a variety of teaching methods which cover all three learning modalities so that different students have equal opportunities
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countries‚ made a commitment to provide timely stimulus to domestic demand while maintaining a sustainable medium-term fiscal strategy (Swan & Tanner‚ Updated Economic and Fiscal Outlook‚ 2009‚ p. 35). In December 2008 the government introduced a $10.4 billion stimulus package; the Economic Security Strategy‚ and in February 2009 the $42 billion National Building and Jobs plan was introduced (see Appendix A for details of the Stimulus). The aim of both stimulus packages was to stimulate the economy as
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Introduction 2. Peculiarities of English modality 1. Modality 2. The linguistic expression of modality 3. Types of modality (according to Bybee) 4. Epistemic‚ deontic and dynamic modality 5. Flexibility of meaning 3. Practical part 3.1. English advertisements analysis 4. Conclusions 5. References 6. Summary in Lithuania 7. Appendix Introduction I chose “Modality in English Newspaper Advertisements”
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The Fiscal Stimulus‚ Flawed but Valuable But I’m also an empirical economist who’s spent a career trying to estimate the effects of monetary and fiscal policy. So let me put on my empiricist’s hat and evaluate what we know about the legislation’s effects. After listening to Representative Paul Ryan in the vice-presidential debate‚ you might think that careful evaluation isn’t needed. In his view‚ we spent $800 billion on the stimulus‚ yet unemployment still rose to 10 percent — so obviously it
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Adrenergic medications affect the four receptors‚ a1‚ a2‚ B1 and B2. The sympathetic nervous system triggers the secretion of epinephrine and norepinephrine. Epinephrine is a hormone and norepinephrine functions as a hormone and neurotransmitter. First we will take a look at the Alpha 1 receptors. These Alpha 1 receptors cause vasoconstriction of vascular smooth muscles. They are located on the post synaptic membranes of effector organs‚ such as on gastral and urinary sphincters. Some are located
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Communication Systems EEE F311 Contents 1 Aim of the course‚ what to expect? 2 Course content 3 Instructions about the course 4 Introduction/Discussions Aim of the course … Understanding signals and systems Analog & Digital modulation/transmission techniques Understanding important block-sets of communication system Information theory Analysis of communication systems Recent trends in communication References required B.P. Lathi‚ Modern
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modern era to recover the Egyptian Ebers Papyrus‚ “an ancient medical text drawn ostensibly from records dating back to the third millennium BCE” (Potts and Campbell 1). Within this medical text‚ archeologists located the first recorded evidence of an induced abortion using a “plant fiber tampon coated with a compound … [that consisted of] honey and crushed dates” (Potts and Campbell 2). As one can see‚ abortion has gone on for thousands of years‚ possibly even prior to the beginning of recorded history
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A graded potential in physiology‚ is described as local changes in membrane potential that occur in varying grades or degrees of magnitude or strength. When compared to graded potential‚ an action potential is described as brief‚ rapid‚ large (100mV) changes in membrane potential during which the potential actually reverses so that the inside of the excitable cell transiently becomes more positive than the outside. As with a graded potential‚ an action potential involves only a small portion of
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Amplitude modulation or AM as it is often called‚ is a form of modulation used for radio transmissions for broadcasting and two way radio communication applications. Although one of the earliest used forms of modulation it is still in widespread use today. The first amplitude modulated signal was transmitted in 1901 by a Canadian engineer named Reginald Fessenden. He took a continuous spark transmission and placed a carbon microphone in the antenna lead. The sound waves impacting on the microphone
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