2,321 research outputs found

    Linear transmitter design for MSAT terminals

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    One of the factors that will undoubtedly influence the choice of modulation format for mobile satellites, is the availability of cheap, power-efficient, linear amplifiers for mobile terminal equipment operating in the 1.5-1.7 GHz band. Transmitter linearity is not easily achieved at these frequencies, although high power (20W) class A/AB devices are becoming available. However, these components are expensive and require careful design to achieve a modest degree of linearity. In this paper an alternative approach to radio frequency (RF) power amplifier design for mobile satellite (MSAT) terminals using readily-available, power-efficient, and cheap class C devices in a feedback amplifier architecture is presented

    The ecological complex controlling activities and distribution of ixodes ricinus

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    The following thesis consists of five papers dealing with the relation of the tick, Ixodes ricinus to its general environment. Three of the papers have already been published, two in "Parasitology" (1934 and 1935), and one in `!The Journal of :Animal Ecology," 1Q34; the fourth paper has been accepted for publication in "Parisotology", and the fifth, being a philosophical interpretation of the experimentally obtained results, is being offered at present for publication in the same journal.i. [Reprinted from the Journal of Animal Ecology, Vol. 3, No. 2, pp. 161 -164, November, 1934.] THE PART PLAYED BY ALTERNATIVE HOSTS IN MAINTAINING THE TICK POPULATION OF HILL PASTURES BY JOHN MACLEODii. IXODES RICINUS IN RELATION TO ITS PHYSICAL ENVIRONMENT: THE INFLUENCE OF CLIMATE ON DEVELOPMENT BY J. MACLEOD FROM PARASITOLOGY, VoL. XXVI, No. 2, 23 JUNE, 1934iii. IXODES RICINUS IN RELATION TO ITS PHYSICAL ENVIRONMENT II. THE FACTORS GOVERNING SURVIVAL AND ACTIVITY BY JOHN MAcLEOD FROM PARASITOLOGY, VOL. XXVII No. 1, 11 MARCH, 1935iv. IXODES RICINUS IN RELATION TO ITS PHYSICAL ENVIRONMENT III. CLIMATE AND REPRODUCTIOĂŹN by John McLeodv. IXODES RICINUiS IN RELATION TO ITS PHYSICAL ENVIRONMEMT IV. An Analysis of the Ecological Com:A.Exes Controlling Distribution and Activities by JOHN MACLEO

    Why are the wrongs wrong?:Scots lawyers’ approaches to justifying liability in delict

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    This article explores the development of Scot’s lawyers’ approaches to justifying delictual liability. It suggests that these reflect the taxonomical relationship between delict and the rest of the law. Four models are posited and discussed: the residual model (delict is the category for wrongful conduct without another taxonomical home); the crime/delict model (criminal law determines what is wrongful and delict handles its private law consequences); the conduct-harm model (wrongfulness is rooted in conduct which foreseeably or intentionally causes harm) and the rights-based model (wrongfulness is grounded on the breach of a right justified elsewhere in private law)

    Some interrelations between the psychology and philosophy of William James

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    Alien Registration- Macleod, John W. (Orono, Penobscot County)

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    https://digitalmaine.com/alien_docs/5464/thumbnail.jp

    Intervening for exhaustion

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    "The search for psychosocial factors that contribute to the aetiology and course of coronary heart disease (CHD) has been an energetic, although not always fruitful, pursuit for more than half a century. Around 20 years ago, Appels [1] identified a prodromal constellation of symptoms, including physical exhaustion and feelings of hopelessness, that preceded major CHD events. It was hypothesized that this syndrome of “vital exhaustion” (VE) was a causal risk factor for CHD events, and several observational studies demonstrating prospective associations between VE and subsequent events have been adduced as supporting the hypothesis [2], [3], [4] and [5]. In a recent commentary, however, we discussed the difficulties inherent in drawing causal conclusions from observational evidence [6]. Applying general arguments that are by now very well rehearsed [7] and [8], we suggested that considerations such as confounding by common antecedents of both VE and CHD and reverse causation could not be readily dismissed and resolution was likely only following experimental studies. For example, an explanation of these prospective associations that regards CHD events as the result of inflammatory processes involved in the progress of atherosclerosis and VE as a consequence of such processes is just as parsimonious as one that regards VE as a causal risk. It is also equally, if not more, plausible biologically; there is now substantial evidence that inflammatory cytokines communicate with the central nervous system contributing to illness behaviour and experience and fostering feelings of depression and fatigue [9]. We also posed the question of what implications do the results of observational studies of VE hold for treatment [6]. Again, we would argue that in the absence of experimental evidence, the implications are extremely limited."\ud \u
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