672 research outputs found
Foreign direct investment in a macroeconomic framework : finance, efficiency, incentives, and distortions
No full textDoes foreign direct investment (FDI) increase domestic investment, or does it provide additional foreign exchange for a pre-existing current account deficit, or some linear combination of the two? The author investigates this question for a group of five Pacific Basin countries and a control group of 11 other developing countries. For the sample of all 16 developing countries, the author finds that FDI does not provide additional balance of payments financing for a pre-existing current account deficit. In the control group of 11 developing countries, FDI is associated with reduced domestic investment - implying that FDI to those countries is simply a close substitute for other capital inflows. For the five Pacific Basin market economies, however, FDI raises domestic investment by the full extent of the FDI inflow. The author finds that FDI has a significantly negative impact on national saving in the sample of all 16 developing countries. For the control group, this negative effect is similar in magnitude to FDI's negative effect on domestic investment - implying a zero effect on the current account. But FDI's negative effect on national saving in the five Pacific Basin developing market economies implies that FDI could have more of a negative effect on the current account than through increased domestic investment alone. The author also investigates the impact of FDI on economic growth in these 16 countries, taking into account distortions in the economies. He estimates reduced-form current account equations, and presents an analytical framework for estimating FDI's effect on economic growth in the presence of incentive-disincentive packages and other economic distortions. He illustrates his framework using indicators of foreign trade and financial distortions. His main conclusion: the effect of FDI differs markedly from one group of countries to another. FDI has a negative effect on economic growth in the control group. It has the same positive effect on growth as domestically financed investment does in the Pacific Basin countries. The main cause for the different effect is the low level of distortion in the Pacific Basin countries.Environmental Economics&Policies,Economic Theory&Research,Foreign Direct Investment,International Terrorism&Counterterrorism,Macroeconomic Management
Sensory and motor neuronal networks of the spinal cord
No full textThis body of work is focused upon neuronal networks of the spinal cord which are
involved in processing of sensory information and generation of motor output. It
includes a detailed account of the synaptic organisation, target neurons and
neurotransmitter content of central terminals of various classes of cutaneous and
proprioceptive primary afferent axons. It shows that presynaptic boutons at
axoaxonic synapses, which regulate primary afferent transmission, contain GABA
but that other transmitters such as glycine, neuropeptide Y and acetylcholine may
be co-localised in these structures. The principal conclusion is that certain subtypes
of presynaptic inhibitory interneurons target the terminals of specific types of primary
afferent fibres but the majority of these neurons do not from 'pure' presynaptic
inhibitory systems because many of them also mediate postsynaptic inhibition. A
further series of investigations provides a detailed analysis of the organisation of
monoaminergic axon terminals and the receptors that they act upon. This work
supports the existence of two parallel modes of action for monoamines in the cord; a
diffuse (non-synaptic or paracrine) system and a specific system which acts through
direct synaptic actions on particular target neurons. Serotonin, for example, acts as
a general modulator but also regulates transmission in some pathways selectively.
Amongst the cells that are targeted selectively, are interneurons in reflex pathways
and a class of projection neuron which receives monosynaptic input from
nociceptive primary afferent axons. More recently, the focus has been on the
organization and neurochemical properties of spinal interneurons. Until recently,
there were few satisfactory classifications of spinal interneurons and the relationship
between functional and structural properties of such cells was unclear. A detailed
analysis of interneurons has shown that there is a clear relationship between the
action of a given interneuron (i.e. whether it is inhibitory or excitatory), its axonal
projections and the classes of cell that it targets. In conclusion, the work reported in
this thesis is an attempt to elucidate neuronal circuits which underlie sensory and
motor processes in the spinal cord by applying modern functional anatomical
approaches.SELECTED REVIEW ARTICLES (PEER REVIEWED):
1. Morris, R., Cheunsuang, O., Stewart, A. and Maxwell, D. (2004) Spinal dorsal horn neurone
targets for nociceptive primary afferents: do single neurone morphological characteristics
suggest how nociceptive information is processed at the spinal level. Brain Res. Rev. 46, 173-
190. (Review article written as co-author with Dr. Richard Morris; contains some unpublished
data from all 4 authors) ||
2. Jankowska, E., Maxwell, D.J. and Bannatyne, B.A. (2007) On coupling and decoupling of
spinal interneuronal networks Arch. Ital. Biol. 145: 235-250, 2007 (Review article written
jointly by E. Jankowska, B.A. Bannatyne and DJM: summarises some of our major findings).SELECTED PEER REVIEWED ARTICLES:
1. Maxwell, D.J. Bannatyne, B.A., Brown, A.G. and Fyffe, R.E.W. (1982) Ultrastructure of
physiologically identified hair follicle afferent fibres in the cat spinal cord. Journal of
Neurocytology 11, 571-582. (Author; performed bulk of experimental work reported). ||
2. Maxwell, D.J., Leranth, Cs. and Verhofstad, A.A.J. (1983) fine structure of serotonin
containing axons in the marginal zone of the rat spinal cord. Brain Research 266, 253-260. ||
(Author; initiated and performed bulk of experimental work reported).
3. Maxwell, D.J., Fyffe, R.E.W. and Rethelyi, M. (1983) Morphological properties of
physiologically characterized lamina III neurons in the cat spinal cord. Neuroscience 10, 1-22.
(Author; initiated and performed bulk of experimental work reported). ||
4. Maxwell, D.J., Fyffe, R.E.W. and Brown, A.G. (1984) Fine structure of normal and
degenerating primary afferent boutons associated with characterized spinocervical tract
neurones in the cat. Neuroscience 12, 151-163. (Author; initiated and performed bulk of
experimental work reported). ||
5. Maxwell, D.J. and Bannatyne, B.A. (1983) Ultrastructure of muscle spindle afferent
terminations in lamina VI of the cat spinal cord. Brain Research 288, 297-301. (Author;
initiated and performed bulk of experimental work reported). ||
6. Maxwell, D.J., Bannatyne, B.A., Fyffe, R.E.W. and Brown, A.G. (1984) Fine structure of
primary afferent terminations projecting from rapidly adapting mechanoreceptors of the toe
and foot pads of the cat. Quarterly Journal of Experimental Physiology 69, 381-392. (Author;
initiated study and performed bulk of experimental work reported jointly with B.A. Banntyne). ||
7. Bannatyne, B.A., Maxwell, D.J., Fyffe, R.E.W. and Brown, A.G. (1984) Fine structure of
primary afferent terminals of slowly adapting cutaneous receptors in the cat. Quarterly Journal
ofExperimental Physiology 69, 547-557. (Author; initiated study and performed bulk of
experimental work reported jointly with B.A. Banntyne).
2 ||
8. Maxwell, D.J., Koerber, H.R. and Bannatyne, B.A. (1985) Light and electron microscopy of
contacts between primary afferent fibres and neurons with axons ascending the dorsal columns
of the feline spinal cord. Neuroscience 16, 375-394. (Author; initiated and performed bulk of
experimental work reported). ||
9. Maxwell, D.J. and Koerber, H.R. (1986) Fine structure of collateral axons originating from
feline spinocervical tract neurons. Brain Research 363, 199-203. (Author; initiated and
performed bulk of experimental work reported).
10.Maxwell, D.J., Christie, W.M. and Somogyi, P. (1989) Synaptic connections of GABAcontaining boutons in the lateral cervical nucleus of the cat: an ultrastructural study employing
pre- and post-embedding immunocytochemical methods. Neuroscience 33, 169-184.
(Author; initiated and performed bulk of experimental work reported). ||
II .Maxwell, D.J., Christie, W.M., Ottersen, O.P. and Storm-Mathisen, J. (1990) Terminals of
group la primary afferent fibres in Clarke's column are enriched with L-glutamate-like
immunoreactivity. Brain Research 510, 346-350. (Author; initiated and performed bulk of
experimental work reported). ||
12.Maxwell, D.J., Christie, W.M., Short, A.D., Storm-Mathisen, J. and Ottersen, O.P. (1990)
Central boutons of glomeruli are enriched with L-glutamate-like immunoreactivity in the spinal
cord of the cat. Neuroscience 36, 83-104. (Author; initiated and performed bulk of
experimental work reported). ||
13.Maxwell, D.J., Christie, W.M., Short, A.D. and Brown, A.G. (1990) Direct observations of
synapses between GABA- immunoreactive boutons and muscle afferent terminals in lamina VI
of the cat's spinal cord. Brain Research 530, 215-222. (Author; initiated and performed bulk of
experimental work reported). ||
14.Maxwell, D.J., Christie, W.M., Short, A.D. and Brown, A.G. (1991) Direct observations of
synapses between GABA- immunoreactive boutons and identified spinocervical tract neurons
in the cat's spinal cord. J.Comp. Neurol. 307: 375-392. (Author; initiated and performed bulk
of experimental work reported). ||
15.Doyle, C.A. and Maxwell, D.J. (1991) Catecholaminergic innervation of the spinal dorsal
horn: a correlated light and electron microscopic analysis of tyrosine hydroxylase
immunoreactive fibres in the cat. Neuroscience, 45, 161-176. (Co-author; initiated and
supervised experimental work reported). ||
16.Doyle, C.A. and Maxwell, D.J. (1991) Ultrastructural analysis of noradrenergic nerve
terminals in the cat lumbosacral spinal dorsal horn: a dopamine-B-hydroxylase
immunocytochemical study. Brain Research 563, 329-333. (Co-author; initiated and supervised
experimental work reported). ||
17.Todd, A.J., Maxwell. D.J. and Brown, A.G. (1991) Relationships between hair-follicle afferent
axons and glycine-immunoreactive profiles in cat dorsal horn. Brain Research 564,132-137.
(Co-author; collaborative study with A. Todd). ||
18.Maxwell, D.J., Christie, W.M., Brown, A.G., Ottersen, O.P. and Storm-Mathisen, J. (1992)
Direct observations of synapses between L-glutamate-immunoreactive boutons and identified
spinocervical tract neurones in the spinal cord of the cat. J. Comp. Neurol. 326, 485-500.
(Author; initiated and performed bulk of experimental work reported). ||
19.Doyle, C.A. and Maxwell, D.J. (1993) Direct catecholaminergic innervation of postsynaptic
dorsal column neurons in the cat spinal cord. J. Comp. Neurol. 331, 434-444. (Co-author;
initiated and supervised experimental work reported). ||
20.Doyle, C.A. and Maxwell, D.J. (1993) Neuropeptide Y- immunoreactive terminals form axo¬
axonic synaptic arrangements in the substantia gelatinosa (lamina II) of the cat spinal dorsal
horn. Brain Research 603, 157-161. (Co-author; initiated and supervised experimental work
reported). ||
21.Maxwell, D.J., Christie, W.M., Brown, A.G., Ottersen, O.P. and Storm-Mathisen, J. (1993)
Identified hair follicle afferent boutons in the spinal cord of the cat are enriched with Lglutamate-like immunoreactivity. Brain Research 606, 156-161. (Author; initiated and
performed bulk of experimental work reported). ||
22.Doyle, C.A. and Maxwell, D.J. (1994) Light- and electron-microscopic analysis of
neuropeptide Y-immunoreactive profiles in the cat spinal dorsal horn. Neuroscience 61, 107-
121. (Co-author; initiated and supervised experimental work reported). ||
23.Doyle, C.A. and Maxwell, D.J. (1994) Catecholaminergic innervation of the lateral cervical
nucleus: a correlated light and electron microscopic analysis of tyrosine hydroxylaseimmunoreactive axons in the cat. Neuroscience 61, 381-389. (Co-author; initiated and
supervised experimental work reported). ||
24.Maxwell, D.J., Ottersen, O.P. and Storm-Mathisen, J. (1995) Synaptic organization of
excitatory and inhibitory boutons associated with spinal neurons which project through the
dorsal columns of the cat. Brain Research 676, 103-112. (Author; initiated and performed bulk
of experimental work reported). ||
25.Jankowska, E., Maxwell, D.J., Dolk, S., Krutki, P. Belichenko, P.V. and Dahlstrom, A. (1995)
Contacts between serotoninergic fibres and dorsal horn spinocerebellar tract neurones in the cat
and rat; a confocal microscopic study. Neuroscience, 67,477-487. (Co-author; collaborative
study with E. Jankowska. Performed much of experimental work reported). ||
26.Maxwell, D.J., Todd,A.J. and Kerr, R. (1995) Colocalization of glycine and GABA in
synapses on spinomedullary neurons. Brain Research 690, 127-132. (Author; initiated and
performed bulk of experimental work reported). ||
27.Maxwell, D.J. and Jankowska, E. (1996) Synaptic relations between serotonin-immunoreactive
axons and dorsal horn spinocerebellar tract cells in the cat spinal cord. Neuroscience, 70, 247-
253. (Author; collaborative study with E. Jankowska. initiated and performed morphological
aspects of experimental work reported). ||
28.McGonigle, D.J., Maxwell, D.J., Shehab, S.A.S. and Kerr,R. (1996) Evidence for the presence
of neurokinin-1 receptors on dorsal horn spinocerebellar tract cells in the rat. Brain Research,
742, 1-9. (Author; initiated, supervised and performed experimental work reported). ||
29.Maxwell, L. Maxwell. D.J., Nielson, M. and Kerr. R. (1996) A confocal microscopic survey
of serotoninergic axons in the lumbar spinal cord of the rat: colocalization with glutamate
decarboxylase and neuropeptides. Neuroscience 75: 471-480(Author; initiated, supervised and
performed experimental work reported). ||
30.Maxwell, D.J., Kerr, R., Jankowska, E. and Riddell, J.S. (1997) Synaptic connections of dorsal
horn group II interneurons: synapses formed with the interneurons and by their axon
collaterals. J.Comp. Neurol. 380: 51-69 (Author; collaborative study with E. Jankowska.
initiated and performed morphological aspects of experimental work reported). ||
31.Patel, R., Kerr, R. and Maxwell, D.J. (1997) Absence of co-localized glutamic acid
decarboxylase and neuropeptides in noradrenergic axons of the rat spinal cord. Brain Res. 749:
164-169. (Author; initiated, supervised and performed experimental work reported). ||
32.Jankowska E., Maxwell, D.J. Dolk, S. and Dahlstrom, A. (1997) A confocal and electron
microscopic study of contacts between 5-HT fibres and feline dorsal horn interneurons in
pathways from muscle afferents J.Comp. Neurol. 387, 430-438 (Co-author; collaborative study
with E. Jankowska. initiated and performed morphological aspects of experimental work
reported). ||
33.Pollock, R., Kerr, R. and Maxwell. D.J. (1997) An immunocyochemical investigation ofthe
relationship between substance P and the neurokinin-1 receptor in the lateral horn of the rat
thoracic spinal cord. Brain Res. 777, 22-30 (Author; initiated, supervised and performed
experimental work reported).
34.Spike, R.C., Kerr, R., Maxwell. D.J. and Todd, A.J. (1998) GluRl and GluR2/3 subunits of the
AMPA-type glutamate receptor are associated with particular types of neuron in laminae I-III
of the spinal dorsal horn of the rat, Eur. J. Neurosci. 10,324-333. (Co-author; collaborative
study with A. Todd. Performed some aspects of experimental work reported). ||
35.Welton J., Stewart W., Kerr R. and Maxwell D.J., (1999) Differential expression of the
muscarinic m2 acetylcholine receptor by small and large motoneurons of the rat spinal cord.
Brain Reserarch 817, 215-219 (Author; initiated, supervised and performed experimental work
reported). ||
36.Maxwell D.J. and Riddell J.S. (1999) Axoaxonic synapses on terminals of group II muscle
afferent axons in the spinal cord of the cat. Eur. J. Neurosci. 11, 2151-2159 (Author; initiated
and performed bulk of experimental work reported) ||
37.Maxwell, D.J., Riddell J.S. and Jankowska, E. (2000) Serotoninergic and noradrenergic axonal
contacts associated with premotor interneurons in spinal pathways from group II muscle
afferents. Eur. J. Neurosci .12,1271-1280. (Author; collaborative study with E. Jankowska.
initiated and performed morphological aspects of experimental work reported). ||
38.Gladden, M.H., Maxwell, D.J., Sahal, A. and Jankowska, E. (2000) Coupling between
serotoninergic and noradrenergic neurones and gamma motoneurones in the cat J.Physiol 527,
213-223.. (Co-author; collaborative study with E. Jankowska. Performed morphological
aspects of experimental work reported). ||
39.Stewart, W. and Maxwell, D.J. (2000) Morphological evidence for selective modulation by
serotonin of a sub-population of dorsal horn cells which possess the neurokinin-1 receptor.
Eur. J. Neurosci. 12, 4583-4588. (Co-author; initiated and supervised experimental work
reported). ||
40.Hammar, I. and Maxwell, D.J. (2002) Serotoninergic and Noradrenergic axons make contacts
with neurons of the ventral spinocerebellar tract in the cat. J. Comp. Neurol. 443, 310-319.
(Co-author; initiated, supervised and performed aspects of experimental work reported). ||
41.Cheunsuang, O., Maxwell, D.J. and Morris, R., (2002) Spinal lamina I neurones which express
neurokinin 1 receptors: Elecctrophysiological properties, responses to primary afferent
stimulation and effects of a selective p-opioid receptor agonist. Neuroscience. Ill, 423-434.
(Co-author; collaborative study with R. Morris. Performed morphological aspects of
experimental work reported). ||
42.0lave, M.J. Puri, N. Kerr, R. and Maxwell, D.J. (2002) Myelinated and unmyelinated primary
afferent axons form contacts with cholinergic interneurons in the spinal dorsal horn. Exp. Brain
Res. 145: 448-456. (Author; initiated, supervised and performed aspects experimental work
reported). ||
43.Sutherland, F.I., Bannatyne, B.A., Kerr, R., Riddell, J.S. and. Maxwell,D.J. (2002)
Inhibitory amino acid transmitters associated with axons in presynaptic apposition to cutaneous
primary afferent axons in the cat spinal cord. J. Comp. Neurol. 452: 154-162. (Author;
initiated, supervised and performed aspects experimental work reported). ||
44.0lave, M.J. and Maxwell. D.J. (2002) An investigation of neurons that possess the a2cadrenergic receptor in the rat dorsal horn. Neuroscience, 115, 31-40. (Co-author; initiated and
supervised experimental work reported). ||
45.Todd, A.J., Hughes, D.I.. Polgar, E., Nagy, G.G., Mackie, M., Ottersen, O.P. and Maxwell,
D.J. (2003) The expression of vesicular glutamate transporters VGLUT1 and VGLUT2 in
neurochemically-defined axonal populations in the rat spinal cord with emphasis on the dorsal
horn. Eur. J. Neuroscience. 17, 13-27. (Co-author; supervised aspects of experimental work
reported). ||
46.Maxwell, D. J., Kerr, R., Rashid S. and Anderson E. (2003) Characterisation of axon terminals
in the rat dorsal horn that are immunoreactive for serotonin 5-HT3A receptor subunits. Exp.
Brain Res. 149, 114-124. (Author; initiated, supervised and performed aspects experimental
work reported). ||
47. Olave, M.J. and Maxwell, D.J. (2003) Axon terminals possessing the a2c-adrenergic receptor
in the rat dorsal horn are predominantly excitatory. Brain Res. 965, 269-273. (Co-author;
initiated and supervised experimental work reported). ||
48.Polgar, E., Hughes, D.I., Riddell, J.S., Maxwell, D.J., Puskar, Z. and Todd, A.J. (2003)
Selective loss ofGABAergic or glycinergic is not necessary for the development of thermal
hyperalgesia in the chronic constriction model of neuropathic pain. Pain. 104, 299-239. (Co-author; collaborative study with A. Todd. Supervised some aspects of experimental work
reported). ||
49.Stewart, W. and Maxwell, D.J. (2003) Distribution and organisation of dorsal horn neuronal
cell bodies that possess the muscarinic m2 acetylcholine receptor. Neuroscience 119, 121-135.
(Co-author; initiated and supervised experimental work reported). ||
50.Mackie. M., Hughes, D.I., Maxwell, D.J., Tillakaratine, N.J.K. and Todd, A.J. (2003)
Distribution and colocalisation of glutamate decarboxylase isoforms in the rat spinal cord.
Neuroscience 119, 461-472. (Co-author; collaborative study with A. Todd. Supervised and
performed some aspects of experimental work reported). ||
51 .Olave, M.J. and Maxwell, D.J. (2003) Neurokinin-1 projection cells in the rat dorsal horn
receive synaptic contacts from axons that possess a.2c-adrenergic receptors J. Neurosci. 23,
6837-6846. (Co-author; initiated and supervised experimental work reported). ||
52.Bannatyne, B.A., Edgley, S.A., Hammar, I., Jankowska, E. and Maxwell D.J. (2003) Networks
of inhibitory and excitatory commissural interneurons mediating crossed reticulospinal
actions. Eur. J. Neurosci. 18, 2273-2284. (Author; collaborative study with E. Jankowska.
initiated and performed morphological aspects of experimental work reported). ||
53.Hammar, I., Bannatyne, B.A. Maxwell, D.J., Edgley, S. A. and Jankowska, E. (2004) The
actions of monoamines and distribution of noradrenergic and serotoninergic contacts on
different subpopulations of commissural interneurons in the cat spinal cord. Eur. J. Neurosci.
19, 1305-1316. (Co-author; collaborative study with E. Jankowska. Performed and supervised
morphological aspects of experimental work reported). ||
54.Olave, M.J. and Maxwell, D.J. (2004) Axon terminals possessing a2c-adrenergic receptors
densely innervate , neurons in the rat lateral spinal nucleus which respond to noxious
stimulation. Neuroscience 126, 391-403 (Co-author; initiated and supervised experimental
work reported)
55.Dougherty, K.J. Bannatyne, B.A., Jankowska, E., Krutki, P. and Maxwell D.J. (2005)
Membrane receptors involved in Modulation of responses of spinal dorsal horn interneurons
evoked by feline group II muscle afferents. J. Neurosci. 25, 584-593. (Co-author; collaborative
study with E. Jankowska. Supervised morphological aspects of experimental work reported). ||
56.Conte, D., Legg, E. D., McCourt, A. C., Silajdzic E.,, Nagy, G. G. and Maxwell. D.J. (2005)
Transmitter content, origins and connections of axons in the spinal cord that possess 5-HT3
receptors. Neuroscience, 134, 165-173. (Author; initiated, supervised and performed aspects
experimental work reported). ||
57.Wilson JM, Hartley R, Maxwell DJ, Todd AJ, Lieberam I, Kaltschmidt JA, Yoshida Y, Jessell
TM, Brownstone RM (2005) Conditional rhythmicity of ventral spinal interneurons defined by
expression of the Hb9 homeodomain protein. J Neurosci 25: 5710-5719 (Co-author;
collaborative study with R. Brownstone, A. Todd and T. Jessell. Performed morphological
aspects of experimental work reported). ||
58.Hughes DI, Mackie M. Nagy GG, Riddell JS, Maxwell DJ, Szabo G, Erdelyi F, Veress G,
Szucs P, Antal M, Todd AJ (2005) P boutons in lamina IX ofthe rodent spinal cord express
high levels of glutamic acid decarboxylase-65 and originate from cells in deep medial dorsal
horn. Proc Natl Acad Sci USA. 102: 9038-9043. (Co-author; collaborative study with A.
Todd. Supervised and performed some aspects of experimental work reported). ||
59.Bannatyne. B.A., Edgley, S.A., Hammar, I., Jankowska, E. and Maxwell D.J. (2006)
Differential projections of excitatory and inhibitory dorsal horn interneurons relaying
information from group II muscle afferents in the cat spinal cord. J. Neurosci. 26: 2871-2880
(Co-author; collaborative study with E. Jankowska. Performed, initiated and supervised
morphological aspects of experimental work reported). ||
60.Erika Polgar, Suzanne Thomson, David J. Maxwell, Khulood Al-Khater and Andrew J. Todd
(20
Velazquez et ses oeuvres
No full textForma part del projecte: Biblioteca Digital d'Història de l'Art Hispànic (UAB)Estudi dedicat al pintor Diego Rodríguez de Silva y Velázquez (1599-1660) escrit per Sir William Stirling-Maxwell (1818-1878). Aquest exemplar ofereix l'obra d'Stirling, segons la traducció francesa, publicada a París el 1865 que està complementada amb el catàleg de les principals obres del cèlebre pintorEstudio dedicado al pintor Diego Rodríguez de Silva y Velázquez (1599-1660) escrito por Sir William Stirling-Maxwell (1818-1878). Este ejemplar ofrece la obra de Stirling, según la traducción francesa, publicada en París en 1865 que va complementada con un catálogo de las principales obras del célebre pintorMonograph study on the painter Diego Rodríguez de Silva y Velázquez (1599-1660) written by the English author Sir William Stirling-Maxwell (1818-1878). This issue features the work of Stirling, according to the French translation, published in Paris in 1865 and supplemented with a catalog of the major works of the famous painte
Design aspects of pipe belt conveyors
No full textThis dissertation investigates how to design a pipe belt conveyor system in a more effective way, considering two aspects: to ensure conveyor belt has sufficient bending stiffness to form an enclosed pipe shape without a contact loss with the idler rolls; and to reduce energy consumption of the system from the indentation rolling resistance. A conveyor belt bending stiffness is quantified from the toughability test. To detect an appearance of a contact loss with the idler rolls, contact forces are determined using three approaches: experimental testing; a newly introduced analytical approach, constructed based on the Displacement Method of Superposition with Maxwell-Mohr Integrals, and using FEM analysis. To determine the indentation rolling resistance, a 3D Maxwell model is used with multiple Maxwell parameters and Winkler foundation.Transport Engineering and Logistic
HARP: A submillimetre heterodyne array receiver operating on the James Clerk Maxwell Telescope
No full textThis paper describes the key design features and performance of HARP, an innovative heterodyne focal-plane array receiver designed and built to operate in the submillimetre on the James Clerk Maxwell Telescope (JCMT) in Hawaii. The 4x4 element array uses SIS detectors, and is the first sub-millimetre spectral imaging system on the JCMT. HARP provides 3-dimensional imaging capability with high sensitivity at 325-375 GHz and affords significantly improved productivity in terms of speed of mapping. HARP was designed and built as a collaborative project between the Cavendish Astrophysics Group in Cambridge UK, the UK-Astronomy Technology Centre in Edinburgh UK, the Herzberg Institute of Astrophysics in Canada and the Joint Astronomy Centre in Hawaii. SIS devices for the mixers were fabricated to a Cavendish Astrophysics Group design at the Delft University of Technology in the Netherlands. Working in conjunction with the new Auto Correlation Spectral Imaging System (ACSIS), first light with HARP was achieved in December 2005. HARP synthesizes a number of interesting features across all elements of the design; we present key performance characteristics and images of astronomical observations obtained during commissioning.Kavli Institute of NanoscienceApplied Science
Perturbations in the Earth's rotation induced by internal density anomalies: implications for sea-level fluctuations
No full textThe effects of internal mass anomalies on the Earth's rotation are analyzed within the framework of linearized Liouville equations and Maxwell rheology for the mantle. Our approach is appropriate for a simplified modeling of subduction. Sea-level fluctuations induced by long-term rotational instabilities are also considered. -from Author
Microstructural modeling of early-age creep in hydrating cement paste
No full textThis paper presents a new approach to model the creep behavior of cement paste at early ages. The creep behavior is simulated by applying a time-varying generalized Maxwell model on the individual elements of a finite-element mesh of a simulated three-dimensional microstructure and compared with results in the literature. All mechanical properties of the constituent phases are taken from literature and Maxwell chain parameters are obtained by fitting the intrinsic creep of calcium silicate hydrate (C-S-H). A reasonable agreement between the simulations and the experimental results are obtained by assuming a constant C-S-H density of 2.0 g/cm3This paper presents a new approach to model the creep behavior of cement paste at early ages. The creep behavior is simulated by applying a time-varying generalized Maxwell model on the individual elements of a finite-element mesh of a simulated three-dimensional microstructure and compared with results in the literature. All mechanical properties of the constituent phases are taken from literature and Maxwell chain parameters are obtained by fitting the intrinsic creep of calcium silicate hydrate (C-S-H). A reasonable agreement between the simulations and the experimental results are obtained by assuming a constant C-S-H density of 2.0 g/cm3 . It was found that better agreements could be obtained at low degree of hydrations, by assuming a loosely packed C-S-H growing in the microstructure. It was also found that the short-term creep characteristics of C-S-H from nanoindentation can be used to reproduce macroscopic creep at least over a few days. The results show how numerical models can be used to upscale phase characteristics to macroscopic properties of composites
Four dimensional Einstein-power-Maxwell black hole solutions in scale-dependent gravity
No full textIn the present work, we extend and generalize our previous work regarding the scale dependence applied to black holes in the presence of non-linear electrodynamics (Rincón et al., 2017). The starting point for this study is the Einstein-power-Maxwell theory with a vanishing cosmological constant in (3+1) dimensions, assuming a scale dependence of both the gravitational and the electromagnetic coupling. We further examine the corresponding thermodynamic properties and how these quantities experience deviations from their classical counterparts. We solve the effective Einstein’s field equations using the “null energy condition” to obtain analytical solutions. The implications of quantum corrections are also briefly discussed. Finally, we analyze our solutions and compare them to related results in the literature.The author A. R. acknowledges DI-VRIEA for financial support through Proyecto Postdoctorado 2019 VRIEA-PUCV. P. B. is funded by the Beatriz Galindo contract BEAGAL 18/00207 (Spain). The author G. P. thanks the Fundação para a Ciência e Tecnologia (FCT), Portugal, for the financial support to the Center for Astrophysics and Gravitation-CENTRA, Instituto Superior Técnico, Universidade de Lisboa , through the Grant No. UID/FIS/00099/2013
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