1,359 research outputs found
Recession, International Trade and the Fallacies of Composition
No full textA truly global recession has not been manifest since the Great Depression of the 1930s. As a result, the multilateral institutions put in place at the end of the Second World War to ensure that a major depression never happened again have not been tested. One of the lessons of the Great Depression was that governments had a major role to play in managing the economy. The use of subsidies to affect economic outcomes was one manifestation of this expanded role. In a recession, sector specific subsidies will likely be requested by firms. Subsidies can distort trade, leading to the potential for beggar thy neighbour subsidy wars. Subsidies will be difficult to discipline in a global recession.beggar thy neighbour, deficits, paradox of thrift, recession, subsidies, International Relations/Trade,
Race for the Kerr field
No full textRoy P. Kerr has discovered his celebrated metric 45 years ago, yet the problem to find a generalization of the Schwarzschild metric for a rotating mass was faced much earlier. Lense and Thirring, Bach, Andress, Akeley, Lewis, van Stockum and others have tried to solve it or to find an approximative solution at least. In particular Achilles Papapetrou, from 1952 to 1961 in Berlin, was interested in an exact solution. He directed the author in the late autumn of 1959 to work on the problem. Why did these pre-Kerr attempts fail? Comments based on personal reminiscences and old notes
Microwave and RF photonic applications of integrated Kerr micro-combs
No full textWe report applications of integrated Kerr micro-combs to RF photonic systems and demonstrate a wide range of advanced functions including a microwave photonic intensity differentiator, filters and true time delays. The on-chip Kerr optical comb is CMOS-compatible and serves as a high-performance multi-wavelength source for transversal filter functions, thus greatly reducing the cost, size, and complexity of the system. © 2018 The Author(s).</p
Political Precaution, Pandemics and Protectionism
No full textDespite strong scientific evidence and representations made by international scientific organizations, a considerable number of countries have imposed import bans on pork in response to the H1N1 pandemic. The imposition of these barriers is contrary to WTO rules. The motivation for the imposition of these barriers does not appear to have arisen from producers’ requests or consumer lobbying – political precaution provides the motivation. There appears to be little control over political precaution in the rules of international trade. Hence, the balance between the strong rules of trade desired by firms wishing to engage in international commerce and the need, at times, for politicians to respond to requests for protection may be changing in favour of more protection. Keywords: H1N1, import bans, pork, precaution, protection, swineH1N1, import bans, pork, precaution, protection, swine, Food Consumption/Nutrition/Food Safety, Health Economics and Policy, International Relations/Trade, Livestock Production/Industries, Political Economy, Public Economics, Risk and Uncertainty,
Polynomial rings over Goldie-Kerr commutative rings
No full textAll rings in this paper are commutative, and
acc
⊥
\operatorname {acc} \bot
(resp.,
acc
⊕
\operatorname {acc} \, \oplus
) denotes the acc on annihilators (resp., on direct sums of ideals). Any subring of an
acc
⊥
\operatorname {acc} \bot
ring, e.g., of a Noetherian ring, is an
acc
⊥
\operatorname {acc} \bot
ring. Together,
acc
⊥
\operatorname {acc} \bot
and
acc
⊕
\operatorname {acc} \, \oplus
constitute the requirement for a ring to be a Goldie ring. Moreover, a ring
R
R
is Goldie iff its classical quotient ring
Q
Q
is Goldie. A ring
R
R
is a Kerr ring (the appellation is for J. Kerr, who in 1990 constructed the first Goldie rings not Kerr) iff the polynomial ring
R
[
x
]
R[x]
has
acc
⊥
\operatorname {acc} \bot
(in which case
R
R
must have
acc
⊥
\operatorname {acc} \bot
). By the Hilbert Basis theorem, if
S
S
is a Noetherian ring, then so is
S
[
x
]
S[x]
; hence, any subring
R
R
of a Noetherian ring is Kerr. In this note, using results of Levitzki, Herstein, Small, and the author, we show that any Goldie ring
R
R
such that
Q
=
Q
c
(
R
)
Q = {Q_c}(R)
has nil Jacobson radical (equivalently, the nil radical of
R
R
is an intersection of associated prime ideals) is Kerr in a very strong sense:
Q
Q
is Artinian and, hence, Noetherian (Theorems 1.1 and 2.2). As a corollary we prove that any Goldie ring
A
A
that is algebraic over a field
k
k
is Artinian, and, hence, any order
R
R
in
A
A
is a Kerr ring (Theorem 2.5 and Corollary 2.6). The same is true of any algebra
A
A
over a field
k
k
of cardinality exceeding the dimension of
A
A
(Corollary 2.7). Other Kerr rings are: reduced
acc
⊥
\operatorname {acc} \bot
rings and valuation rings with
acc
⊥
\operatorname {acc} \bot
(see 3.3 and 3.4).</p
Directly diode pumped Kerr lens mode-locked Ti:sapphire oscillator
No full text2014 Fall.Includes illustrations (some color).Includes bibliographical references (pages 68-71).This document describes how 445nm laser diodes were successfully used to pump a soft aperture Kerr lens mode-locked Ti:sapphire oscillator. Measurements were taken in order to determine the mechanism behind the mode-locking bias in these oscillators. It was determined that the gain was higher for the mode-locked mode of operation even though the 1/e[superscript 2] radius of the pump was larger than the 1/e[superscript 2] radius of both the CW and mode-locked modes in the crystal. This indicates that the 1/e[superscript 2] radius of the beams is not enough information to determine if mode-locking will occur and an accurate model will need to take the full beam profile into account
Spectral multiplexing of dissipative Kerr solitons in a single optical microresonator
No full textWe experimentally demonstrate that dissipative Kerr solitons generated in different spectral regions can stably coexist in a single optical microresonator enabling spectral multiplexing of soliton microcombs. (C) 2020 The Author(s)LPQ
Splitting Microresonator Modes with the Kerr-Nonlinearity
No full textWe observe two-fold and three-fold splitting of optical modes in ultra-high-Q microresonators induced by the Kerr effect. This can be used for applications that require multiple resonances with precisely controlled offset.</p
A critical comparison of William James and Søren Kierkegaard on religious belief
No full textThis thesis is a critical comparison of the accounts of religious belief proposed byWilliam James and Søren Kierkegaard. Both James and Kierkegaard greatly emphasizethe subjective aspects of religious belief. In view of this fact, surprisingly littlecomparative work has been done in this area. I contribute to this literature in two ways.Firstly, I make a brief assessment of what James knew of Kierkegaard’s work.Secondly, I draw four comparisons between Kierkegaard and James. In Chapter One Iexamine the claim that Kierkegaard proposes a pragmatist account of faith of the kindthat James sets out in his essay The Will To Believe. I argue that this claim rests on amisunderstanding of Kierkegaard’s argument that to have faith is to take a risk. In thefollowing chapter I discuss James’s and Kierkegaard’s views on formal proofs for theexistence of God. Both philosophers reject the notion that faith can be based on suchproofs. I distinguish between their positions, and argue in favour of Kierkegaard’s. Inthe third chapter I compare Kierkegaard’s and James’s accounts of religious experience.James views religious experiences as a special kind of evidence for the existence ofGod. For Kierkegaard it is a mistake to view religious experiences as evidence. Suchexperiences should be understood in relation to the concept of religious authority. In thefinal chapter I examine Kierkegaard’s conception of faith as a life-view. I argue that forKierkegaard a life-view is a fundamental perspective on one’s existence. I compare thisconception with James’s concept of philosophical temperament and in relation to hisdiscussion of the sick soul
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