Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2019 ( 5 )

2018 ( 2 )

2017 ( 8 )

2016 ( 14 )

Custom range...

Search Results: 1 - 10 of 2007 matches for " Monika Lewandowska "
All listed articles are free for downloading (OA Articles)
Page 1 /2007
Display every page Item
A New Approach to Carbonate Alkalinity  [PDF]
Bogus?aw Pilarski, Anna M. Micha?owska-Kaczmarczyk, Agustin G. Asuero, Agnieszka Dobkowska, Monika Lewandowska, Tadeusz Micha?owski
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2014, DOI: 10.4236/jasmi.2014.42009

The article provides experimental data applied to the determination of carbonate alkalinity (CAM) according to modified Gran II functions. CAM is related to the mixtures NaHCO3 + Na2CO3 and Na2CO3 + NaOH. In addition to the determination of equivalence volumes, one of the main novelties of the proposed method is the possibility of determining the activity coefficient of hydrogen ions (γ). Moreover, CAM can be used to calculate the dissociation constants (K1, K2) for carbonic acid and the ionic product of water (KW) from a single pH titration curve. The parameters of the related functions are calculated according to the least squares method.

Interferon alfa a opryszczkowate zapalenie skóry
Marian Dmochowski,Danuta Januszkiewicz-Lewandowska,Monika Bowszyc-Dmochowska
Clinical Dermatology , 2007,
Abstract: Przedstawiono kolejny przypadek opryszczkowatego zapalenia skóry prawdopodobnie ujawnionego po zastosowaniu interferonu alfa. Interferon alfa mo e uczynnia neutrofile u tych chorych. Przypadek ten sugeruje, e autoimmunizacja wobec transglutaminazy naskórkowej rozwija si równie u takich chorych.
The capital barrier to innovation in the small and medium-sized enterprises
Lucyna Lewandowska
Comparative Economic Research , 2009, DOI: 10.2478/v10103-009-0006-7
Abstract: The article discusses SMEs' situation with reference to the process of creating an innovative economy. The presented discussion covers both non-material and financial barriers impeding the development of innovations. The examined range of new solutions designed to finance innovation includes types of capital support such as leasing, franchising, venture capital, Business Angels, NewConnect.
The Pulsar in the Crab Nebula
Natalia Lewandowska
Physics , 2015,
Abstract: The Crab pulsar belongs to one of the most studied stellar objects in the sky. Since its accidental detection in 1968, its pulsed emission has been observed throughout most of the electromagnetic spectrum. Although currently one of more than 2000 known pulsars, its way of work has remained not understood making the Crab pulsar an object of continuous studies and interest. Referring to the pulsed emission of the Crab pulsar only at radio wavelengths, it reveals a diversity of different phenomena. They range from deviations of the predicted slowing down process of the pulsar with time (long time phenomena) to an irregularity of its single pulse emission (short time phenomena). Similar and different kinds of deviations are observed at other wavelengths. Consequently, the Crab pulsar provides a large diversity of different emission characteristics which have remained difficult to interpret with a uniform theoretical approach including all observed properties. Since a review of all currently examined properties of the Crab pulsar is beyond the scope of this paper, its goal is to give an overview of previous studies of the Crab pulsar predominantly at radio and gamma-wavelengths with an emphasis on a possible connection to its radio single pulse emission. A discussion of a possible identification of common emission mechanisms is given.
Zespó jelita nadwra liwego - jedno schorzenie czy wiele chorób? Uwagi o ewolucji kryteriów diagnostycznych IBS
Agnieszka Lewandowska,Leszek Paradowski
Polish Gastroenterology , 2008,
Abstract: Objawy zespo u jelita nadwra liwego (irritable bowel syndrome - IBS) s opisywane ju od XIX wieku. Schorzenie to nale y do grupy zaburzeń czynno ciowych przewodu pokarmowego. Nie dysponujemy adnymi biologicznymi markerami tej choroby, dlatego diagnoza IBS jest cz sto ustalana dopiero po wykluczeniu przyczyny organicznej zg aszanych przez pacjenta dolegliwo ci. W artykule przedstawiono ewolucj kryteriów diagnostycznych IBS - od zaproponowanych w 1978 roku kryteriów Manninga, a do opublikowanych w 2006 roku najnowszych III Kryteriów Rzymskich.
Sulphates in particles of different sizes in the marine boundary layer over the southern Baltic Sea
Lucyna Falkowska,Anita Lewandowska
Oceanologia , 2004,
Abstract: Concentrations of sulphate ions and particle size distributions were measured in the marine boundary layer using a ten-cascade Berner impactor at Hel between December 1997 and March 1998, and with a filter pack in Gdynia from February to May 2001. In the marine boundary layer over the Hel Peninsula the presence of natural sea-salt and non-sea-salt sulphate ions (nssSO42-) was confirmed in the aerosols. The nssSO4 were present in all size ranges only in December 1997 and in the first half of January 1998, making up an average of 83.7 ± 2.4% of the total sulphate content. In the other winter months, nssSO42- were recorded only in aerosols of diameters from 0.4 to 1.5 μm, and their average contribution dropped by over 20%. The extended growing season in the Southern Baltic resulted in the formation of fine particles that appeared in the marine boundary layer in early winter. At that time the proportion of nssSO42- in ultra-fine particles ranged from 75.7% to 100%. The concentration of nssSO42-, which varied from 0.8 to 2.3 nmol m-3 in particles < 0.4 μm in size probably constituted the natural background aerosol population in the relatively clean coastal environment of the Southern Baltic Sea. In the coastal urbanised area of Gdynia, the sulphate concentration in aerosols was higher than at Hel (av. 75.3 nmol m-3) but the proportion of nssSO4 was low, of the order of 24%. Sea salt was then the dominant source of sulphate.
Ammonia and ammonium over the southern Baltic Sea. Part 1. Preparation of aerosol and air samples for the determination of ammonia by the indophenol method
Anita Lewandowska,Lucyna Falkowska
Oceanologia , 2004,
Abstract: 1997 saw the start of a study into the spatial and temporal changes in the chemical composition of the atmosphere over the littoral and offshore waters of the Baltic Sea. Collection of samples and their subsequent chemical analysis was preceded by meticulous laboratory experiments concerning the validation and adaptation of the analytical procedures. The colorimetric indophenol blue technique was used to analyse the aerosol samples for the concentration of ammonium ions and the air samples for their gaseous ammonia. The samples were collected with PTFE-filters and Whatman 41 filters coated with 5% orthophosphoric acid. This acid enhances the aerosol sampling efficacy but reduces the pH of the reaction in which indophenol is formed. The pH of the aerosol samples thus had to be raised, and this in turn required an alteration to the original procedure prior to ammonia determination. It was demonstrated that the addition of 0.1 N KOH to the filters coated with H3PO4 increases the pH of the reaction medium to the required level of pH = 8-11.5 and does not substantially influence the precision of the determination; the error of the modified procedure was of the order of 5.2%. Air samples for the determination of gaseous ammonia were collected with annular denuders. Oxalic acid and citric acid are the usual impregnating agents. In the present experiments oxalic acid was used for denuder impregnation; it turned out to be more effective than citric acid under the conditions of the southern Baltic Sea. The detection limit of the indophenol blue method in these laboratory experiments was 0.045 mmol dm-3. The respective relative standard deviations (RSD) within the range of higher and lower concentrations were 0.64% and 4.53%.
Effect of iron limitation on cells of the diatom Cyclotella meneghiniana Kützing
Jolanta Lewandowska,Alicja Kosakowska
Oceanologia , 2004,
Abstract: The response of the Baltic diatom Cyclotella meneghiniana to iron deficiency was examined. The following growth parameters were measured: cell number, chlorophyll a and protein content. The results demonstrate the ability of this diatom to grow well with minimal iron availability; however, the rate of growth fell markedly at the lowest iron(III) concentration. The results of spectrophotometric chlorophyll a measurements and protein assays using the Lowry and Bradford methods indicated a significant decrease in their quantities. Iron may therefore be an important regulatory factor controlling the growth of diatom C. meneghiniana in an aquatic ecosystem.
The Effect of Different Movement Exercises on Cognitive and Motor Abilities  [PDF]
Monika Thomas
Advances in Physical Education (APE) , 2012, DOI: 10.4236/ape.2012.24030
Abstract: The influence of physical activity on motor and cognitive performance has been approved in several studies. However, it is still unclear which functions are affected, and why. It also remains unknown what type of physical training is best suitable. The present study focuses on special movement aspects based on the Brain Gym? program. Four groups of subjects (n = 64) participated in two experiments with pre-post intervention design. In experiment 1 two groups of subjects were exposed to a sensorimotor adaptation study design by executing center out pointing movements under distorted visual feedback conditions with their dominant and non-dominant arm to test for intermanual transfer (IMT) as pre- and posttest. The intervention in both groups consisted of specified movement exercises with the right and left extremities: participants of Experimental group executed movements crossing the body midline and participants of Control group movements without crossing the body midline. Results showed a decreased retention of adaptation but larger IMT for Experimental group during posttest. We conclude that movements crossing the body midline impede retention but enhance IMT of sensorimotor adaptation. A potential relationship to an improvement of communication between the cerebral hemispheres evoked by the movement exercises crossing the body midline is rather speculative. In experiment 2 two groups were exposed to the d2-test measuring concentration and attention and a dice-test testing for visual-spatial abilities as pre- and posttest. The interventions were similar to experiment 1. Results yielded no differences between groups such that different effects of both interventions could not have been shown.
Two Blind Adaptive Equalizers Connected in Series for Equalization Performance Improvement  [PDF]
Monika Pinchas
Journal of Signal and Information Processing (JSIP) , 2013, DOI: 10.4236/jsip.2013.41008

A variable step-size parameter is usually used to accelerate the convergence speed of a blind adaptive equalizer with N1 + N2 -1 coefficients where N1 and N2 are odd values. In this paper we show that improved equalization performance is achieved when using two blind adaptive equalizers connected in series where the first and second blind adaptive equalizer have N1 and N2 coefficients respectively compared with the case where a single blind adaptive equalizer is applied with N1 + N2 -1 coefficients. It should be pointed out that the same algorithm (cost function) is used for updating the filter taps for the different equalizers and that a fixed step-size parameter is used. Simulation results show that for the low signal to noise ratio (SNR) environment and for the case where the convergence speed is slow due to the channel characteristics, the new method has a faster convergence speed with a factor of approximately two while leaving the system with approximately the same or lower residual intersymbol interference (ISI).

Page 1 /2007
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.