4,054 research outputs found
On-load Tap Changer Diagnosis on High-Voltage Power Transformers using Dynamic Resistance Measurements
No full textHigh-voltage transformers have tap changers to regulate the voltage in the high-voltage network when the load changes. Those tap changers are subject to different degradation mechanisms and need regular maintenance. Various defects, like contact degradation, often remain undetected and the probability of maintenance errors cannot be neglected. Preventive diagnosis of dynamic resistance can be used to determine the contact condition and to check the basic function of the tap changer. This can guarantee that the high-voltage transformer can be put back into operation safely after maintenance. In addition, the information obtained can be used for condition-based maintenance. The research of Jur Erbrink elaborates on the condition assessment of tap changers using dynamic resistance measurements. He describes in his thesis the different ways in which the measurements can be performed and how this influences the measurement results. In particular it was emphasized that the dynamic resistance measurements at a lower the test current are more sensitive for long term aging effects. It is also investigated which defects can be detected and how the results can be interpreted.High Voltage Technology and ManagementElectrical Engineering, Mathematics and Computer Scienc
Public Programs at The New York Public Library.
No full textAmong the varied programs offered by the Library during the Spring, a series of lectures, Fables: From Aesop to La Fontaine, gets a page of recognition. The series is done by Marcel M. Gutwirth. It is meant to support and coincide with the Library's La Fontaine: The Power of Fables exhibition, co-curated by Paul LeClerc. The booklet features eight outstandingly-reproduced engravings by J.J. Grandville, including the cover engraving of the two high-society goats unable to pass through the doorway at the same time.Paul LeClerc
Kamloops, the hub
No full textPublished by the Kamloops Secondary Resource Centre with the co-operation of the Kamloops Secondary School Art and Commerce Department. Contains historic essays with the following chapter titles: Stkamlu-leps-mux - The People of the Confluence; Cumcloops; Fur Trading Days; The Old Saint - A Biography of Mr. Captian Saint Paul, Chief of the Shuswap Indians; Education comes to Kamloops; Principals of the Kamloops Schools 1886-1959. J.J. Morse was a former teacher.Not peer reviewedHistoric bookletCumcloop
PHB metabolism and N-removal in sequencing batch granular sludge reactors
No full textApplied Science
Kamloops, the hub
No full textPublished by the Kamloops Secondary Resource Centre with the co-operation of the Kamloops Secondary School Art and Commerce Department. Contains historic essays with the following chapter titles: Stkamlu-leps-mux - The People of the Confluence; Cumcloops; Fur Trading Days; The Old Saint - A Biography of Mr. Captian Saint Paul, Chief of the Shuswap Indians; Education comes to Kamloops; Principals of the Kamloops Schools 1886-1959. J.J. Morse was a former teacher.Not peer reviewedHistoric bookletCumcloop
Hemodynamic regulation of metalloendopeptidases EC3.4; 24.15 and EC3.4; 24.16: expression and function in the vascular endothelium
No full textHemodynamic forces, namely shear stress and cyclic strain, have been well characterised as modulators of vascular endothelial function, and have been assigned an important role in the maintainence of vascular tone, haemostasis, and regulation of vascular growth and health. They exert their influence in part by effecting changes in the production and release of vasoactive compounds by the endothelium, and by effecting changes in the levels and activity of various enzymes. Thimet oligopeptidase (EC3.4.24.15, EP24.15) and neurolysin (EC3.4.24.16, EP24.15) are closely related zinc metalloendopeptidases that have been shown to be expressed and active in the vascular endothelium. Their substrates include the vasoactive peptides bradykinin and angiotensin I, which have been identified as important regulators of both blood pressure and angiogenic processes. Other related peptidases, namely endothelin converting enzyme (ECE) and angiotensin converting enzyme (ACE), have been shown to be regulated by hemodynamic forces in the vascular endothelium. As such EP24.15 and EP24.16 are likely candidates for regulation by hemodynamic forces.
In this regard we have investigated the effect of cyclic strain on the expression and activty of EP24.15 and EP24.16 in cultured bovine aortic endothelial cells (BAECs). We have shown that exposure to cyclic strain significantly increases the mRNA expression as well as both the cellular and secreted activity of both enzymes. We have demonstrated that up-regulation of both enzymes is dependent on Gi-protein mediated signalling, although with varying Gia/G(3y subunit specificity for either enzyme. Using immunocytochemistry, we have also demonstrated a strain-dependent increase in EP24.15 protein expression within the nucleus and cytoplasm in parallel with an increase in membrane associated EP 24.15
The effects of strain on the ability of BAECs in culture to cleave both Ang I, and BK in an EC24.15/EC24.16 specific manner was also studied. We observed that exposure to cyclic strain induces a significant increase in the EP24.15 specific hydrolysis of both exogenously added BK and Ang I.
The potential of the observed effects of cyclic strain on EP24.15 to effect changes in endothelial cell function were also examined. Use of the dual EP24.15/EP24.16 inhibitor, cFP-AAF-pAB, and the EP24.15 specific antisense, FLIP, was seen to significantly attenuate cyclic strain-induced endothelial cell tubule formation and migration. We also found that the effects of FLIP transfection on cyclic strain-induced endothelial cell tubule formation could be largely reversed by addition of exogenous Ang-(l-7). Taken together these results suggest that strain-induced endothelial cell angiogenesis and migration putatively involves EP24.15 cleavage of vasoactive peptide substrates
Eddies and currents: A review of Upstream, anyone? A critical reply to J.J. Fellows’ Downstream of the experts, by Raphael Sassower
No full textJill Fellows responds to Raphael Sassower's review 'Upstream, anyone? A critical reply to J.J. Fellows’ Downstream of the Experts.'Final article published
WILLIAM KENRICK, "PREFACE TO ELOISA BY J.J. ROUSSEAU" (1761)
No full textELOISA : BY J.J. ROUSSEAU, PREFACE By the Translator [William Kenrick], 4 vols. London : Griffiths, Becket and De Hondt, 1761. Read the French translation Download the bilingual version of the text (pdf) William Kenrick (1729/30-1779) was a typical eighteenth-century hackwriter. He is the author of verse satires and plays (some of which were successful), he was a contributor to and editor of several periodicals, he gave public lectures on Shakespeare, he is the author of a dictionary of the E..
WILLIAM KENRICK, "PREFACE TO ELOISA BY J.J. ROUSSEAU" (1761)
No full textELOISA : BY J.J. ROUSSEAU, PREFACE By the Translator [William Kenrick], 4 vols. London : Griffiths, Becket and De Hondt, 1761. Read the French translation Download the bilingual version of the text (pdf) William Kenrick (1729/30-1779) was a typical eighteenth-century hackwriter. He is the author of verse satires and plays (some of which were successful), he was a contributor to and editor of several periodicals, he gave public lectures on Shakespeare, he is the author of a dictionary of the E..
Proceedings of the Per Bruun Symposium
No full textHolocene sea level rise, shoreline erosion and the Bruun Rule-overview (J.J. Fisher) The Bruun Rule: A historical perspective (M.L. Schwartz and V. Milicic) Hypothetical shore profiles in response to rising water level (R.N. Dubois) Shoreline erosion, Rhode Island and North Carolina coasts-test of Bruun Rule (J. J. Fisher) An application of the Bruun Rule in the Chesapeake Bay (P.S. Rosen) Bruun's Concept applied to the Great Lakes (E.B. Hands) Enigma of the Bruun's formula in shore erosion (H. Allison) The 11 Bruun Rule", Discussion on boundary conditions (P. Bruun)KWP-collectio
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