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1.
Anna Sztaniszlav Magdolna Balla Maria Farkas-Jahnke Csaba Novák 《Journal of Materials Science》1990,25(5):2353-2358
The kinetics of solid-state reactions of powdered reactants were investigated by X-ray and by differential thermogravimetry in a magnetic field. Measurements revealed mutual diffusion of the Fe3+ and In3+ ions in the Fe2O3-In2O3 system heat treated for 3 h at 700 to 1400° C. Diffusion of indium into the Fe2O3 lattice caused a shift of the Curie temperature of the antiferromagnetic iron oxide towards lower temperatures. Only Caln2O4 was found between CaCO3 and In2O3 up to 1400° C. Also, in the Fe2O3-CaCO3-In2O3in system, the reaction started with the mutual diffusion of iron and indium and the forming of CaFe2O4. End-products were the magnetic -Ca4Fe14O25 and CaFe4O7, and the non-magnetic CaFe5O7, depending on the In3+ concentration. Indium stabilized the magnetic calcium-iron oxide structures, shifting their Curie temperatures towards lower values. 相似文献
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3.
Katalin Balla Galina A. Kurina Roswitha März 《Journal of Dynamical and Control Systems》2006,12(3):289-311
The index of DAE systems arising from linear quadratic optimal control problems is considered. Necessary and sufficient conditions
ensuring regularity with tractability index one are proved. Then, it is shown that if the control problem DAE is regular with
index one and if the leading term of the DAE to be controlled is given by one full-column-rank and one full-row-rank matrix,
then it has a Hamiltonian inherent explicit ODE. For problems with regular index zero or index one DAEs to be controlled,
the DAE of the control problem is shown to be regular with tractability index one or three, depending on whether the control
coefficient R is singular.
2000 Mathematics Subject Classification.
49N10, 49J15, 34A09.
Supported by the DFG research center MATHEON in Berlin. This work was partially
supported by the Russian Fundamental Research Foundation Project Nos. 02-01-00351
and 06-01-00296. 相似文献
4.
Sengupta A. Bandyopadhyay S. Balla A. R. Jaekel A. 《Photonic Network Communications》2000,2(2):163-184
In this paper, we have studied a number of algorithms for routing in all-optical wavelength routed networks. We have considered situations where a lightpath is dynamically created in response to a request for communication and the WDM channels constituting the lightpath are reclaimed when the communication is over. We have looked at two schemes for dynamic wavelength allocation. In the first scheme we have assumed the existence of a central agent to maintain a database of existing lightpaths where the central agent attempts to generate a new lightpath in response to a request for communication. In the second scheme, we attempt to generate a new lightpath using a distributed algorithm. In the first scheme we have exploited the existence of multiple paths between any pair of nodes in a network in order to reduce the blocking probability. For the second scheme, we have proposed three distributed strategies to determine, if possible, a lightpath when there is a request for communication. Each of these strategies have their advantages and disadvantages in terms of the expected blocking probability and the set-up time. We have studied the performances of both the schemes using Monte Carlo simulation. 相似文献
5.
COULIBALY Balla Moussa ZHAO Xiong-wen LIANG Xiao-lin LI Shu LI Yi-wei 《中国邮电高校学报(英文版)》2014,21(5):43-46
The fixed level and dynamic denoising method was studied based on indoor-to-outdoor measured channel impulse responses ORs) at 5.25 GHz with radio frequency (RF) 100 MHz bandwidth. It is found that the dynamic ranges, peak powers and noise floors of the IRs are with close correlations. The comparisons with different denoising methods are given by deriving the power delay profiles (PDPs), root mean square (RMS) delay spread (RMS DS), number of paths (NOPs) and Ricean K-factors. It is concluded that the traditional fixed level noise cut is under estimate of DS and NOPs. The Ricean K-factors are of little sensitive to noise cut irrespective of what kind of methods applied. The PDPs are not very sensitive to the fixed level noise cut, however, obvious changes can be found by dynamic noise cut. The dynamic noise cut is preferred when clear noise floors is observed and decided from the measured IRs, it's of importance in data post processing for wideband radio channel measurements as well as the relevant modeling work. 相似文献
6.
Emese Rka Blint Gabriella Fr Balzs Kui Zsolt Balla Eszter Sra Kormnyos Erik Mrk Orjn Brigitta Tth Gyngyi Horvth Edina Szcs Sndor Benyhe Eszter Ducza Petra Pallagi Jzsef Malth Viktria Venglovecz Pter Hegyi Lrnd Kiss Zoltn Rakonczay Jr. 《International journal of molecular sciences》2022,23(3)
Opioids are widely used for the pain management of acute pancreatitis (AP), but their impact on disease progression is unclear. Therefore, our aim was to study the effects of clinically relevant opioids on the severity of experimental AP. Various doses of fentanyl, morphine, or buprenorphine were administered as pre- and/or post-treatments in rats. Necrotizing AP was induced by the intraperitoneal injection of L-ornithine-HCl or intra-ductal injection of Na-taurocholate, while intraperitoneal caerulein administration caused edematous AP. Disease severity was determined by laboratory and histological measurements. Mu opioid receptor (MOR) expression and function was assessed in control and AP animals. MOR was expressed in both the pancreas and brain. The pancreatic expression and function of MOR were reduced in AP. Fentanyl post-treatment reduced necrotizing AP severity, whereas pre-treatment exacerbated it. Fentanyl did not affect the outcome of edematous AP. Morphine decreased vacuolization in edematous AP, while buprenorphine pre-treatment increased pancreatic edema during AP. The overall effects of morphine on disease severity were negligible. In conclusion, the type, dosing, administration route, and timing of opioid treatment can influence the effects of opioids on AP severity. Fentanyl post-treatment proved to be beneficial in AP. Clinical studies are needed to determine which opioids are best in AP. 相似文献
7.
A Betrosian M Balla G Kafiri C Palamarou N Sevastos 《Canadian Metallurgical Quarterly》1996,311(6):292-295
Issues concerning patient advocacy and nursing advocacy are explored in relation to the nurse's role and the UKCC code of conduct. The author's personal experiences of being an advocate are described. Potential conflict between the nurse's role and doctor's role in relation to advocacy is identified. The best person to take on the role of patient advocate is discussed. 相似文献
8.
Marsh Herbert W.; Hau Kit-Tai; Roche Lawrence; Craven Rhonda; Balla John; McInerney Valentina 《Canadian Metallurgical Quarterly》1994,86(3):457
Critique methodological aspects of B. S. Randhawa's et al (see record 1993-23567-001) structural equation modeling (SEM) of relations between self-efficacy, attitudes, and achievement in mathematics. Major findings of their study were that self-efficacy mediated the effects of attitudes on achievement and that self-efficacy and attitudes were more strongly related to achievement for boys than for girls. The authors' reanalysis of their data does not substantiate these conclusions. Rather, it identifies inappropriate applications of SEM and the consequent misinterpretations of results. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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