Wyniki wyszukiwania - Biblioteka Nauki

1

A complex measure for linear grammars

100%

Chattopadhyay I. , Ray A.

Demonstratio Mathematica

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2005

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tom Vol. 38, nr 3

761--775

EN

The signed real measure of regular languages, introduced and validated in recent literature, has been the driving force for quantitative analysis and synthesis of discrete-event supervisory (DES) control systems dealing with finite state automata (equivalently, regular languages). However, this approach relies on memoryless state-based tools for supervisory control synthesis and may become inadequate if the transitions in the plant dynamics cannot be captured by finitely many states. From this perspective, the measure of regular languages needs to be extended to that of non-regular languages, such as Petri nets or other higher level languages in the Chomsky hierarchy. Measures for non-regular languages has not apparently been reported in open literature and is an open area of research. As a step toward achieving this goal, this paper introduces a complex measure of linear context free grammars (LCFG) that belong to the class of non-regular languages. The proposed complex measure becomes equivalent to the signed real measure, reported in recent literature, if the LCFG is degenerated to a regular grammar.

2

Zastosowanie techniki ATR-FTIR w analizie ilościowej

100%

Czarnecka K. , Kamińska-Bach G.

Farby i Lakiery

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2012

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tom nr 4

8--15

PL

W artykule przedstawiono metody ilościowego oznaczania zawartości octanu butylu i środka powierzchniowo-czynnego w modelowych próbkach techniką ATR-FTIR, stosując metodę dodatku wzorca wewnętrznego i/lub krzywej kalibracyjnej. Podjęto również próbę oznaczania zawartości merów octanu winylu w kopolimerze EVA na podstawie krzywej kalibracyjnej poli(octanu winylu).

EN

This paper presents methods for the quantitative determination of butyl acetate and surfactant in model samples of ATR-FTIR technique, using an internal standard addition method and/or calibration curve. Been conducted to determine the monomer units of vinyl acetate in EVA copolymer based on the calibration curve of poly (vinyl acetate).

3

Aplikácia vybraných salzburských princípov do doktorandského študijného programu pedagogika

100%

Dupkalová M.

Społeczeństwo i Edukacja. Międzynarodowe Studia Humanistyczne

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2014

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nr 3(15)

73-79

EN

There were received Salzburg principles aimed to creating the doctoral programs in 2005. From a theoretical perspective, the article focuses on selected Salzburg principles and their implementation in conditions of Faculty of Humanities and Natural Sciences at University of Presov. There are presented the partial results of a quantitative content analysis of text documents in the presented article (individual characteristics of the curricula of the doctoral program in the field of study – pedagogy at selected universities in Slovakia and the Czech Republic).

4

Multivariate statistical analysis of tropane alkaloids in Anisodus tanguticus (Maxim.) Pascher from different regions to trace geographical origins

100%

Chen C. , Li J. , Xiong F. , Wang B. , Xiao Y. , Zhou G.

Acta Chromatographica

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2022

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tom Vol. 34, no. 4

422--429

EN

Anisodus tanguticus (Maxim.) Pascher is an important Tibetan folk medicine and the source of tropane alkaloids (TAs) grown in Qinghai-Tibet Plateau. There are marked differences in quality of A. tanguticus from geographic areas. The aim of present research was to establish a method for the quantitative analysis of TAs coupled with chemometrics analysis to trace geographical origins. Qualitative analysis of TAs in A. tanguticus was carried out using ultra-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry and quantitative analysis of TAs in different plant organs from different geographical origin was achieved. Contents of TAs were subjected to the principal component analysis, and orthogonal partial least-squares discriminant analysis. The contents of the three marker compounds (anisodamine, anisodine and atropine) in the roots and acrial parts of A. tanguticus were positive correlated and varied significantly from different geographical origins. Principal component analysis, and orthogonal partial least-squares discriminant analysis results showed excellent discrimination between different geographical origin of A. tanguticus. This study could provide comprehensive evaluation and further utilization of A. tanguticus resources.

5

Generalized practical stability analysis of discontinuous dynamical systems

100%

Zhai G. , Michel A. N.

International Journal of Applied Mathematics and Computer Science

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2004

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tom 14

|

nr 1

5-12

EN

In practice, one is not only interested in the qualitative characterizations provided by the Lyapunov stability, but also in quantitative information concerning the system behavior, including estimates of trajectory bounds, possibly over finite time intervals. This type of information has been ascertained in the past in a systematic manner using the concept of practical stability. In the present paper, we give a new definition of generalized practical stability (abbreviated as GP-stability) and establish some sufficient conditions concerning GP-stability for a wide class of discontinuous dynamical systems. As in the classical Lyapunov theory, our results constitute a Direct Method, making use of auxiliary scalar-valued Lyapunov-like functions. These functions, however, have properties that differ significantly from the usual Lyapunov functions. We demonstrate the applicability of our results by means of several specific examples.

6

Formirovanie prostranstva priznakov dlja raspoznavanija pochv s ispol'zovaniem mul'tifraktal'nogo analiza

100%

Smil'skijj V. , Sidorchuk A.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2014

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tom 16

|

nr 4

7

Simultaneous RP-LC analysis of 10-O-(N,N-dimethylaminoethyl)-ginkgolide B and three related impurities

100%

Liu W.-Y. , Yang X.-J. , Li P. , Feng F. , Mao L.

Acta Chromatographica

|

2011

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tom Vol. 23, no. 3

459--468

EN

10-O-(N,N-dimethylaminoethyl)-ginkgolide B (XQ-1) is an intermediate for synthesizing 10-O-(N,N-dimethylaminoethyl)-ginkgolide B methanesulfonate (XQ-1H), which is a novel ginkgolide B derivative and is being developed as a platelet-activating factor antagonist. A specific and rapid liquid chromatographic method was developed for the quantitative analysis of XQ-1 and its three related impurities, which were 10-O-(N,N-dimethylaminoethyl)-11,12-seco-ginkgolide B (imp-1), 10-O-(N,N-dimethylaminoethyl)-11,12-seco-3,14-dehydroginkgolide B (imp-2) and 10-O-(N,N-dimethylaminoethyl)-3,14-dehydroginkgolide B (imp-3) simultaneously in XQ-1 samples. Chromatographic separation was achieved on a CN band stationary phase, with the mobile phase consisting of methanol and 20 mM dipotassium hydrogen phosphate (pH 7.5) (50:50, υ/υ) in isocratic elution. The flow rate was 1.0 mL min-1 and detector was set at 220 nm. The method was optimized by the analysis of the samples generated during the forced degradation studies. The XQ-1, imp-1, imp-2, and imp-3 were completely separated within 15 min. The resolutions (Rs) amongst four target compounds were >2. The developed method was validated with respect to specificity, linearity, accuracy, precision, and robustness. The results indicated that the simultaneous LC determination method was readily utilized as a quality control method for XQ-1 sample.

8

Simultaneous determination of eight kinds of gingerols in zingiberis rhizome collected from different areas of China

100%

Wang Y. , Chen J. , Li Y. , Li P. , Iqbal J. , Chen Y. , Ma Y. , Zhang C.

Acta Chromatographica

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2018

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tom Vol. 30, no. 3

164--168

EN

A reliable and rapid high-performance liquid chromatography coupled with diode array detector method (HPLC–DAD) was established and validated to determine eight gingerol simultaneously in the rhizomes of Zingiber offcinale Rosc. The separation of eight compounds (4-hydroxy-3-methoxy-benzenebutanol,3,5-dihydroxy-1-(4-hydroxy-3-methoxyphenyl) decane, 3,5-dihydroxy-1-(3,4-dimethoxyphenyl) decane, 6-gingerol, 8-gingerol, 6-shogaol, 5-hydroxy-1-(4-hydroxy-3-methoxyphenyl)-1,4-decadien-3-one, and 10-gingerol) were performed on an Agilent TC(2) C18 (250 mm × 4.6 mm, 5 μm) at 30 °C using acetonitrile (A) and 1% formic acid aqueous solution (B) as the mobile phase with gradient elution (0–10 min, 20%–35% A; 10–28 min, 35%–55% A; 28–35 min, 55%–60% A; 35–55 min, 60%–70% A; 55.01–60 min, 100%–100% A). The detection wavelength was set at 280 nm, and the flow rate was 0.8 mL/min. Validation of the analytical method was performed by linearity, precision, and accuracy test. All compounds were quantified with good linear calibration curves (coefficient of determination R2, >0.9999). The method showed good precision with overall coefficients of variation between 0.56% and 0.84%. The range of recovery was from 95.50% to 104.14% for the analytes. This method was successfully applied to quantify eight gingerols in Z. offcinale Rosc from different regions in China, so it can provide quality assessment for this medicine.

9

Development and validation of ultra-high performance supercritical fluid chromatography method for quantitative determination of four target flavonoids components in citrus samples

100%

Li B. Q. , Li Z. Y. , Li X. K. , Tan L. F.

Acta Chromatographica

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2023

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tom Vol. 35, no. 2

115--122

EN

A new method for the analysis of four target flavonoids in two kinds of citrus samples by ultra-high performance supercritical fluid chromatography (UHPSFC) method was developed. Main variables affecting the UHPSFC separation were optimized, and under the optimized conditions the four target compounds (tangeretin, nobiletin, hesperetin and naringenin) can be separated within 10 min. The UHPSFC method allowed the determination of the four target compounds in the diluted stock solutions with limit of detection (LOD) ranging from 1.08 to 2.28 μg mL⁻¹, and limit of quantification (LOQ) ranging from 1.45 to 4.52 μg mL⁻¹, respectively. The coefficients of determination (R2) of the calibration curves were higher than 0.9950. The recoveries of the four target compounds at three different concentrations were in the range of 82.4–117.6%. The validation results demonstrated that the proposed method is simple, accurate, time-saving and environment friendly, and it is applicable to a variety of complex samples such as medicine-food dual purpose herbs and functional foods.

10

Simultaneous quantitation of 13 active components in SimiaoYong'an decoction using high-performance liquid chromatography with diode array detection

100%

Zheng L. , Wang M. , Chen Z. , Hou J. , Li X.

Acta Chromatographica

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2019

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tom Vol. 31, no. 3

216--221

EN

SimiaoYong'an decoction, a traditional Chinese medicine formula consisting of four herbs, has been widely used for the treatment of gangrene disease. However, its clinical application is restricted due to the lack of an effective quality control method that covers the main active compounds in the formula. In this study, a high-performance liquid chromatography with diode-array detection (HPLC–DAD) method was established for the simultaneous determination of 13 active compounds including harpagide, neochlorogenic acid, chlorogenic acid, cryptochlorogenic acid, ferulic acid, isochlorogenic acid B, isochlorogenic acid A, isochlorogenic acid C, angoroside C, harpagoside, cinnamic acid, glycyrrhizic acid, and ligustilide. Separation of these compounds was achieved using a Kromasil 100-5-C18 column with a gradient elution program consisting of acetonitrile and 0.4% phosphoric acid solution. The specificity, linearity, precision, repeatability, and accuracy tests were implemented to validate the method. The validated method was successfully applied for determination of 13 components from several finished batches of SimiaoYong'an decoction. The results demonstrated that the established method was accurate, reliable, and could be used as a suitable quality control method for the quantification of SimiaoYong'an decoction.

11

Aplikácia vybraných salzburských princípov do doktorandského študijného programu pedagogika

100%

Dupkalová M.

Prosopon. Europejskie Studia Społeczno-Humanistyczne

|

2014

|

nr 1(7)

59-66

EN

There were received Salzburg principles aimed to creating the doctoral programs in 2005. From a theoretical perspective, the article focuses on selected Salzburg principles and their implementation in conditions of Faculty of Humanities and Natural Sciences at University of Presov. There are presented the partial results of a quantitative content analysis of text documents in the presented article (individual characteristics of the curricula of the doctoral program in the field of study – pedagogy at selected universities in Slovakia and the Czech Republic).

12

Simulation studies into quayside transport and storage yard operations in container terminals

100%

Deja M. , Dobrzyński M. , Siemiątkowski M. S. , Wiśniewska A.

Polish Maritime Research

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2017

|

tom S 1

46--52

EN

The focus of the paper is in quayside transport and storage yard operations in container terminals. Relevant algorithms have been applied and a simulation model adopted. Evaluative criteria chosen for that model were: the total time of ship unloading and the truck utilization level. Recommendations for unloading in berth and yard areas were analysed in three different case studies. Results of simulations and deterministic model based analyses are included.

13

Determination of some psychotropic drugs in human plasma by HPTLC

88%

Wróblewski K. , Petruczynik A. , Waksmundzka-Hajnos M.

Acta Chromatographica

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2014

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tom Vol. 26, no. 2

297--307

EN

Psychotropic drugs: desipramine, olanzapine and mitrazapine were chromatographed on cyanopropyl-silica and Diol-silica thin layers using various nonaqueous and aqueous eluents.The best results were obtained with addition of ammonia to nonaqueous eluent on both adsorbents. On the basis of the optimization, systems for extraction from human plasma and quantitative determination of investigated drugs were selected.RP18 encaped SPE columns conditioned and pre-eluted with acetonitrile:water:ammonium buffer at pH 8.6 (5:5:2) and eluted with methanol:water (9:1) containing 2% acetic acid were used for sample preparation with high recoveries of all investigated drugs. Diol and CN plates with mixture of 15% methanol in diisopropyl ether + 1% ammonia were used for quantitative analysis by a calibration curve method.

14

Struktury sekwencyjne w Kronice Dalimila: analiza stylometryczna

88%

Pawłowski A. , Eder M.

Rocznik Slawistyczny

|

2015

|

tom 64

79-106

EN

The object of this paper is a quantitative study of sequential structures in the medieval Czech chronicle Dalimilova Kronika. The authors analyses style changes in the chronicle and tries to answer some questions concerning its authorship. Another topic discussed in this paper concerns the relationship between orality and literacy at the threshold of the Middle Ages in Europe. A philological approach, combined with quantitative tools including trend analysis and time series modeling, is applied in this paper.

15

The Potential of Fuzzy Logic for Quantitative Land Cover Change Analysis Basing on Historical Topographic Maps

88%

Zachwatowicz M.

Miscellanea Geographica. Regional Studies on Development

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2011

|

tom 15

231-240

EN

This paper describes an approach that allows to reduce error propagation when comparing historical topographic maps. By linking the fuzzy set theory with simple map algebra and Kappa statistics, the uncertainty resulting from dissimilar quality of the maps can at least be partly eliminated and a distinction between ‘true’ and ‘false’ land cover changes can be made.

16

New method for quantitative analysis of GD2 ganglioside in plasma of neuroblastoma patients

88%

Czaplicki D. , Horwacik I. , Kowalczyk A. , Wieczorek A. , Bolek-Marzec K. , Balwierz W. , Kozik A. , Rokita H.

Acta Biochimica Polonica

|

2009

|

tom 56

|

nr 3

423-431

EN

Neuroblastoma, the most common extracranial solid tumour of childhood, is a malignancy of unknown origin and non-specific symptoms. One of the markers of the disease is GD2 ganglioside (disialoganglioside), which is abundantly expressed on the surface of neuroblastoma cells. Gangliosides are known to be shed by tumour cells and this phenomenon can be significant in cancer progression as they inhibit a number of immune responses both in vitro and in vivo. In search for novel markers useful in monitoring and prognosis of neuroblastoma, we developed and validated a new quantitative method of GD2 ganglioside analysis in human blood plasma. We evaluated the level of gangliosides in blood serum of 34 neuroblastoma patients using high-performance liquid chromatography. The technique was used to detect fluorescently labelled oligosaccharides derived from serum glycosphingolipids by enzymatic digestion with ceramide glycanase. The developed method allowed determination of GD2 concentrations at the picomole level and required only 40 µl of plasma, which should be particularly useful when the quantity of clinical material is limiting. Moreover, this method can be applied to study concentration of other gangliosides, as shown for GD3 ganglioside. Analysis of plasma samples from the 34 neuroblastoma patients did not reveal any correlations between the concentration of GD2 ganglioside and clinical parameters, including the results of therapy; it showed, however, that the concentration of GD2 ganglioside in the plasma of neuroblastoma patients decreased substantially in the course of treatment.

17

Exhibitions dedicated to communist Poland in polish museums in 1989–2017 from a quantitative (statistical) perspective

88%

Wąchała-Skindzier M.

Muzealnictwo

|

2022

|

tom 63

185-193

EN

The objective of the research was a survey identification of the presence of the history of Communist Poland, PRL, in museum narrative in 1989–2017. Importantly, this is a repeated, supplemented, and more thorough research versus the one presented in the paper ‘PRL in Museum Narrative over the Last 25 Years’ published in 2014 in the Światowid. Rocznik Muzeum PRL-u (w organizacji) periodical. The research discussed in the present paper forms part of a doctoral dissertation, constituting the research’s second stage. As a result of the conducted research based on survey answers provided by museums and on individual research a database containing 642 exhibitions was created. When processing the data, quantitative analysis was adopted. After data cleaning the following statistical trends were analysed: exhibition duration over the whole research period, percentage of leading themes, percentage of themes in respective cities. The conducted analysis has permitted to observe trends in museum narrative concerning PRL. Also the most popular exhibition duration over the research period has been identified (up to two years and permanent exhibitions). The most popular categories have been named: art history, political history, history of everyday life. Three groups of urban centres where museum narrative is present to a varied degree have been named. The fourth group contains cities in whose museums the topic of PRL has not been tackled over the last 28 years, or such projects cannot be reliably confirmed.

18

Fingerprint of ethyl acetate extraction combined with qualitative and quantitative analysis on Patrinia scabra Bunge: Distinguish P. scabra Bunge from its confusable species

88%

Liu W. , Wei M. L. , Wu C. Y. , Zhu H. Y. , Feng F. , Xie N.

Acta Chromatographica

|

2015

|

tom Vol. 27, no. 1

177--187

EN

Patrinia scabra Bunge has long been used in clinic as a traditional Chinese medicine for treating leukemia and cancer and regulating host immune response. Despite their wide use in China, no report on system analysis on their chemical constituents is available so far. The current study was designed to profile the fingerprint of ethyl acetate extract of it, and in addition, to characterize the major fingerprint peaks and determine their quantity. Therefore, a detailed gradient high-performance liquid chromatography was described to separate more than 30 compounds with satisfactory resolution in P. scabra Bunge. Based on the chromatograms of 10 batches samples, a typical high-performance liquid chromatographic (HPLC) fingerprint was established with 23 chromatographic peaks being assigned as common fingerprint peaks. Furthermore, a quadrupole time of flight mass spectrometry (Q-TOF/MS) was coupled for the characterization of major compound. As (+)-nortrachelogenin was the most predominant compound in P. scabra Bunge, the quantification on it was also carried out with the method being validated. As a result, (+)-nortrachelogenin was found to be from 1.33 to 2.21 mg g−1 in this plant material. This rapid and effective analytical method could be employed for quality assessment of P. scabra Bunge, as well as pharmaceutical products containing this herbal material.

19

Trends in the internationalization of European higher education in a convergence perspective

88%

Dima A. M. , Vasilache S.

Management & Marketing

|

2016

|

tom 11

|

nr 2

449-457

EN

The paper proposes several indicators for the degree of convergence in the internationalization of European higher education, based on previous research on the topic and on the availability of data in the large repositories, such as Eurostat. Starting from longitudinal data series built using the values of the selected indicators in 2015; we have grouped European higher education systems in clusters, based on their similarity, that is, potential for medium term convergence. These findings may serve as a guiding methodology for further, more detailed investigations on convergence and divergence of higher education systems in Europe. The main limitations arise from the availability of data, more specifically from the lack of in-depth data collection at the European level.

20

Quantitative typological analysis of Romance languages

88%

Liu H. , Xu C.

Poznań Studies in Contemporary Linguistics

|

2012

|

tom 48

597-625

EN

Based on real-text corpora with syntactic annotation, this study quantitatively addressed the following two questions: whether quantitative methods and indexes can point to the diachronic syntactic drifts characterizing the evolution from Latin to Romance languages and whether these methods and indexes can provide evidence to evince the shared syntactic features among Romance languages and define them as a distinctive language subgroup. Our study shows that the distributions of dependency directions are suggestive of positive answers to the above two questions. In addition, the dependency syntactic networks extracted from the dependency treebanks reflect the degree of inflectional variation of a language, and the clustering analysis shows that these parameters, in spite of some imperfections, can also help differentiate Romance languages from Latin diachronically and from other languages synchronically.