1,558 research outputs found
Invariant tori and Lagrange stability of pendulum-type equations
No full textAbstractIn this paper we prove that the pendulum-type equation x″ + g(t, x) = 0 possesses infinitely many invariant tori whenever g(t, x) has zero mean value on the torus T2, where g(t, x) belongs to C∞(T2). This yields the boundedness for solutions of the considered pendulum-type equation and thus leads to an answer to J. Moser's boundedness problem (1973, Ann. of Math. Stud. 77)
Erythrocytes alter the pattern of renal hypoxic injury: predominance of proximal tubular injury with moderate hypoxia.
No full text1. The distribution of morphological injury was assessed qualitatively and quantitatively in the perfused rat kidney in vitro at controlled rates of oxygen delivery in the presence of low concentrations of erythrocytes. 2. In control kidneys (total oxygen delivery approximately 32 mumol/min per kidney) no injury was seen in the medullary thick ascending limb of Henle's loop (MTAL) whilst 11 +/- 5(SD)% of proximal tubules sustained damage. 3. Mild hypoxia (total oxygen delivery approximately 28 mumol/min per kidney) produced little or no injury to MTAL, namely 6 +/- 4(SD)% and 3 +/- 3% of tubules damaged, respectively. In contrast, both groups sustained extensive damage to proximal tubules, averaging 46 +/- 13% (P less than 0.01 vs control) and 84 +/- 14% (P less than 0.001 vs control), respectively. This damage was equally distributed between the superficial and deep cortex. 4. Comparison with morphometric data obtained previously from cell-free-perfused rat kidneys [P.J. Ratcliffe, Z. H. Endre, S. J. Scheinman, J. D. Tange, J. G. G. Ledingham and G. K. Radda (1988) Clinical Science 74, 437-448] showed that (a) erythrocytes prevent hypoxic damage to the MTAL at mild and moderate levels of hypoxia; (b) when oxygen delivery rates are matched between cell-free- and erythrocyte-perfused kidneys, proximal tubular injury is greater in the presence of erythrocytes; (c) when arterial partial pressure of oxygen is matched between cell-free- and erythrocyte-perfused kidneys, the degree of proximal tubular injury is similar. 5. The data suggest that the proximal tubule and not the MTAL is the nephron segment most at risk of hypoxic injury in vitro
Erythrocytes alter the pattern of renal hypoxic injury: predominance of proximal tubular injury with moderate hypoxia.
No full text1. The distribution of morphological injury was assessed qualitatively and quantitatively in the perfused rat kidney in vitro at controlled rates of oxygen delivery in the presence of low concentrations of erythrocytes. 2. In control kidneys (total oxygen delivery approximately 32 mumol/min per kidney) no injury was seen in the medullary thick ascending limb of Henle's loop (MTAL) whilst 11 +/- 5(SD)% of proximal tubules sustained damage. 3. Mild hypoxia (total oxygen delivery approximately 28 mumol/min per kidney) produced little or no injury to MTAL, namely 6 +/- 4(SD)% and 3 +/- 3% of tubules damaged, respectively. In contrast, both groups sustained extensive damage to proximal tubules, averaging 46 +/- 13% (P less than 0.01 vs control) and 84 +/- 14% (P less than 0.001 vs control), respectively. This damage was equally distributed between the superficial and deep cortex. 4. Comparison with morphometric data obtained previously from cell-free-perfused rat kidneys [P.J. Ratcliffe, Z. H. Endre, S. J. Scheinman, J. D. Tange, J. G. G. Ledingham and G. K. Radda (1988) Clinical Science 74, 437-448] showed that (a) erythrocytes prevent hypoxic damage to the MTAL at mild and moderate levels of hypoxia; (b) when oxygen delivery rates are matched between cell-free- and erythrocyte-perfused kidneys, proximal tubular injury is greater in the presence of erythrocytes; (c) when arterial partial pressure of oxygen is matched between cell-free- and erythrocyte-perfused kidneys, the degree of proximal tubular injury is similar. 5. The data suggest that the proximal tubule and not the MTAL is the nephron segment most at risk of hypoxic injury in vitro
The charged and the spin-excitation gaps in the double-exchange model: a rigorous result
No full textWe extend a previous result of ours [G.S. Tian, Phys. Rev. B58 (1998) 7612] on the charged gap and the spin-excitation gap of the half-filled Kondo lattice model to the double-exchange model. In our original approach, this model cannot be dealt with since its localized spins have a large spin number S = 3/2. By following a construction argument due to Zener and rewriting the double-exchange Hamiltonian, we are able to overcome this difficulty and re-establish the same relation for this model.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000088659700004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Physics, MultidisciplinarySCI(E)中国科学引文数据库(CSCD)3ARTICLE121-303
A 2-watt balanced power amplifier MMIC for Ku-band satellite communications
No full textA Ku-band power amplifier MMIC has been developed using 0.25-mum GaAs pHEMT technology. To achieve small chip size and simple drain-bias connection, a bus-bar power combiner is used. Also, balanced-power amplifier topology is used to obtain good input/ output return losses. The small-signal gain is about 15 dB and the gain variation is less than 1 dB from 12 to 17 GHz. Good input/output return losses are achieved at less than -15 dB due to the balanced topology. P-IdB of 32.6 dBm and PAE of 23.5% are achieved at 14 GHz. The effective chip area is 4.2 X 3.2 mm. Because the power amplifier is implemented using the balanced topology with the bus-bar power combiner, compact size, high output power, and good input/output return losses can be achieved simultaneously. (C) 2004 Wiley Periodicals, Inc.The author would like to thank Jeong-Ho Lee, Chung-Hwan Kim,
and Jae-Jin Lee at Teltron for their helpful discussions and encouragement.
This work was supported by KOSEF under the ERC
program through the MINT research center at Dongguk University
Systemic lupus erythematosus and nephritis: severe relapse with disappearance of antinuclear antibodies.
No full textExacerbations of systemic lupus erythematosus with active renal disease are almost always associated with high plasma titres of antinuclear factor (ANF) and DNA-binding antibody (anti-ds DNA). We describe a patient with classical systemic lupus erythematosus and initial high titres of antinuclear antibodies in whom severe relapse resulting in renal failure coincided with a prolonged reversion to normal of these serological indices
Flexicurity - Useful Oxymoron or Genuine Class Compromise?
No full textAuthor has checked copyrightDG 16/11/12Names JG 2012-11-1
Gesetzliche Mindestlöhne in Irland
No full textAuthor has checked copyrightDG 16/11/12Names JG 2012-11-1
- …
