Wyniki wyszukiwania - Biblioteka Nauki

1

Relations for moments of generalised order statistics based on Weibull–G family of distributions

100%

Athar H. , Alharbi Y. F. , Fawzy M. A.

Operations Research and Decisions

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2022

|

tom 32

|

nr 4

EN

The Weibull distribution is one of the important distributions used in reliability theory and life-testing experiments. The generalised versions of the Weibull distribution give a more flexible model for these studies. The Weibull–G family of distributions is one of the extended versions extensively studied. In this paper, we have studied moments properties of generalised order statistics for the said distribution in terms of a single moment, product moments and characterisation. Several examples and special cases are presented. The results can be applied to all distributions belonging to this family.

2

The Characterisation of Joseph by Matthew (Matt 1–2; 13:55)

100%

Mielcarek K.

The Biblical Annals

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2023

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tom 13

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nr 2

335-362

EN

The article presents the figure of Joseph and his place in the narrative by the first evangelist in Matt 1–2. Apart from the arguments for the unifying function of Mary’s spouse in the whole Infancy Narrative, the most important features of Joseph highlighted by Matthew are emphasised. Those include the attitude of the righteous man, the fact of belonging to the royal family of King David, the bond and similarity to the actions of the patriarchs, as well as the silent and ascetic nature of the spouse and parent. Despite many similarities to the Lukan narrative, the first evangelist stresses different aspects in his characterisation of Joseph. Using the tools proposed by Cornelis Bennema, the author of the paper also assesses the degree of characterisation of the person under study, his role in the narrative and his representative value for the modern reader.

3

Identification of tin species released in solution during water leaching of solids from the alkaline smelting (NaOH-KOH) of stanniferous ores

100%

Yuma P. M. , Kitungwa B. K. , Mubiayi P. K. , Shengo M. L. , Moloto N. , Ngubeni G. , Mbayo M. K. , Kyona C. W.

Physicochemical Problems of Mineral Processing

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2024

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tom Vol. 60, iss. 3

art. no. 189758

EN

Tin species were studied from Makundju ores in DRCongo. The identification of tin species released in aqueous solution during leaching of solids from the alkaline smelting (NaOH-KOH) was done to prepare added-value mining products on tin ores mined in the eastern DR Congo. Prior to alkaline fusion to have the smelting products (SP), the initial sample (IS) was processed for tests and characterization of tin species. Alkaline fusion in molten KOH-NaOH system was used and leached solution was considered for further analyses. Various physicochemical techniques including X-ray fluorescence spectrometry (XRF), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and FTIR spectroscopy were used to characterize the initial ore and the molten cake. Water leached cake solution at a solid/liquid ratio of 1:10 was used to identify and characterize tin species. ICP-OES analysis of the pH 11.9 solution revealed a content of 4506.3 ppm, which is equivalent to a 95.87% leaching yield. Such yield attests to the stable Sn(OH)2-6(aq) ion as confirmed by UV-Vis. Crystallizations of M2Sn(OH) 6(s) (M = Na and/or K) was studied using XRD, FTIR and TGA. As pH decreases below 9, Sn(OH) )2-6(aq) ion changes to other tin species such as Sn(OH)-5(aq), Sn(OH)4(S), Sn(OH)+3(aq), Sn(OH)2+2(aq), Sn(OH)3+(aq) and Sn4+(aq). The stability of each the tinspecies was determined at different pH values in aqueous solution. Hence, alkaline hexahydroxostannate nanoparticles, used in many electronic applications, can be produced from tin ores.

4

Synthesis and Characterisation of 2,2-Dinitro-1,3-propanediol-based Plasticisers

100%

Ek S. , Eldsäter C. , Goede P. , Holmgren E. , Tryman R. , Latypov N. V. , Raymond Y. G. Y. , Wang L. Y.

Central European Journal of Energetic Materials

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2005

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tom Vol. 2, nr 4

33-45

EN

In this paper, the synthesis of two energetic plasticisers (2,2-dinitro-1,3-bis(2-azido acetoxy) propane and 2,2-dinitro-1 ,3-bis(formyloxy)propane is outlined. The attempted syntheses of even further derivatives are described. The prepared compounds were characterised and evaluated as plasticisers. Their glass transition temperatures are acceptable to excellent, but both of them are thermally unstable.

5

Adsorbent Characterization from Cocoa Shell Pyrolysis (Theobroma cacao L) and its Application in Mercury Ion Reduction

100%

Nursiah C. , Desvita H. , Elviani E. , Farida N. , Muslim A. , Rosnelly C. M. , Mariana M. , Suhendrayatna S.

Journal of Ecological Engineering

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2023

|

tom Vol. 24, nr 6

366--375

EN

In this paper, we describe the characterization and application of adsorbent derived from the pyrolysis of cocoa shells, which is a natural source of adsorbent materials. The adsorbent that was used in this experiment is an environmentally friendly adsorbent that was prepared by the pyrolysis of cocoa shells. For 1.5 hours, the pyrolysis process was carried out at temperatures ranging from 300 to 380 °C. The adsorbent was characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and analysis with an X-ray diffraction (XRD) analyzer. Water-ash content and iodine absorption capacity were also determined in accordance with SNI 06-3730-1995. At a contact time of 90 minutes, the adsorption capacity of mercury ions was found to be 0.106 mg/gram. In this study, the adsorption of mercury ions with the adsorbent followed pseudo-second-order models with an R2 value of 0.9929.

6

Relations for moments of generalised order statistics based on Weibull–G family of distributions

100%

Athar H. , Alharbi Y. F. , Fawzy M. A.

Operations Research and Decisions

|

2022

|

tom Vol. 32, No. 4

17--31

EN

The Weibull distribution is one of the important distributions used in reliability theory and life-testing experiments. The generalised versions of the Weibull distribution give a more flexible model for these studies. The Weibull–G family of distributions is one of the extended versions extensively studied. In this paper, we have studied moments properties of generalised order statistics for the said distribution in terms of a single moment, product moments and characterisation. Several examples and special cases are presented. The results can be applied to all distributions belonging to this family.

7

Prospects for using wastewater from a farm for algae cultivation: The case of Eastern Colombia

100%

Urbina-Suarez N. A. , Barajas-Solano A. F. , Garcia-Martinez J. B. , Lopez-Barrera G. L. , González-Delgado A. D.

Journal of Water and Land Development

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2022

|

tom no. 52

172--179

EN

In recent years, the technical and economic feasibility of using microalgae and cyanobacteria has been explored for the removal and exploitation of domestic, agricultural and industrial residual effluents with high C, N and P compounds content. To contribute to the understanding of the process and its technical viability for microalgae growth, the article discusses monitoring, flow determination, and physicochemical characteristics of two types of effluents generated in an experimental farm located in the east of Colombia, before (R1) and after biological treatment (R2). In general, the results showed the reduction of different parameters, such as total dissolved solids (TDS), hardness, salinity and phosphates after treatment with activated sludge. However, the conductivity value obtained in R1 and R2 showed the presence of a pollutant load. These findings can be attributed to the highest concentration of fats and oils in the water during early hours of the day. Finally, although the concentration of nitrates increased from 46.63 to 225.21 mg∙dm-3 and phosphate decreased slightly from 9.65 to 6.21 mg∙dm-3,no inhibition was generated in the microalgae, as evidenced in the growth of the microalgal biomass in effluents after nitrate and phosphate removal above 80%.

8

Założenia kierunkowe Systemu Infrmacji Przestrzennej w Polsce

86%

Bielecka E.

Archiwum Fotogrametrii, Kartografii i Teledetekcji

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2001

|

tom Vol. 11

P-23--P-28

PL

Artykuł przedstawia najważniejsze założenia Systemu Informacji Przestrzennej w Polsce opracowane w trakcie prac nad projektem badawczym zamawianym „ Koncepcja SIP w Polsce ". Projekt zamowiony przez MSWiA realizowany byl przez Instytut Geodezji i Kartografii w kooperacji z Politechniką Warszawską, AGH, Uniwersytetem WarmińskoMazurskim i Uniwersytetem Śląskim vv latach 1998-2001.

9

Improving optical and morphological properties of Mn-doped ZnO via Ar ion sputtering followed by high-temperature UHV annealing

86%

Zehar E. , Ouerdane A. , Chetti B. , Çoruh A.

Materials Science Poland

|

2023

|

tom Vol. 41, No. 2

325--338

EN

Using the ultrasonic spray pyrolysis technique, pure (ZnO) and manganese (4at%)-doped zinc oxide (ZnMnO) thin films were synthesized and treated with Ar+ sputtering in the UHV (ultra-high vacuum) system. In this regard, XRD (X-ray diffraction), XPS (X-ray photoelectron spectroscopy), PL (photoluminescence), and AFM (atomic force microscopy) techniques were applied to investigate the electronic and photonic properties of ZnO. XRD and XPS allowed us to identify the successful incorporation of Mn as a substitute for Zn, while PL and AFM images reveal a high tendency for crystalline grains on the ZnMnO surface to aggregate to form small grains. However, bandgap narrowing, a redshift with considerable fluctuations in excitonic emission, and a perfect quenching of visible emission (400–640 nm) were observed. Investigations into defect-related emission in ZnMnO and ZnO compounds were conducted. The PL spectra of the prepared samples were measured and analyzed using Gaussian fitting. The PL of undoped ZnO exhibited an intense broad band with a peak at 550 nm. Two effects were shown to occur as a result of Mn doping: (i) a sharp quenching of self-activated PL with a progressive red-shift of the quenching’s spectral boundary; (ii) the appearance of a new emission band with a peak at 1.64 eV (756 nm), which dominates the PL spectrum and is noted in a band diagram; as well as a slight shift in the main line of ZnO, which is located at energy 3.275 eV (378.57nm).

10

Optimization of Packing Density of M30 Concrete with Steel Slag as Coarse Aggregate Using Fuzzy Logic

86%

Arivoli M. , Malathy R.

Archives of Metallurgy and Materials

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2017

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tom Vol. 62, iss. 3

1903--1913

EN

Concrete plays a vital role in the design and construction of the infrastructure. To meet the global demand of concrete in future, it is becoming a challenging task to find suitable alternatives to natural aggregates. Steel slag is a by-product of steel making process. The steel slag aggregates are characterized by studying particle size and shape, physical and chemical properties, and mechanical properties as per IS: 2386-1963. The characterization study reveals the better performance of steel slag aggregate over natural coarse aggregate. M30 grade of concrete is designed and natural coarse aggregate is completely replaced by steel slag aggregate. Packing density of aggregates affects the characteristics of concrete. The present paper proposes a fuzzy system for concrete mix proportioning which increases the packing density. The proposed fuzzy system have four sub fuzzy system to arrive compressive strength, water cement ratio, ideal grading curve and free water content for concrete mix proportioning. The results show, the concrete mix proportion of the given fuzzy model agrees with IS method. The comparison of results shows that both proposed fuzzy system and IS method, there is a remarkable increase in compressive strength and bulk density, with increment in the percentage replacement of steel slag.

11

Bacterial selection of the Pseudomonas genus with the capacity to treat water and contaminated soils

86%

Escudero-López H. J. , Serrano-Carrillo K. A. , Jácome-Pilco C. R. , Sanaguano-Salguero H. d. R. , Bayas-Morejón I. F.

Journal of Water and Land Development

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2022

|

tom no. 53

238--241

EN

In the present work, bacteria of the Pseudomonas genus native to the Ecuadorian Amazon with the capacity to treat contaminated water and soils were selected. For this purpose, 20 soil samples from Amazon region with evidence of contamination were analysed. For identification, each sample was assigned a code according to the sampling area: Joya de los Sachas (S), Minga (M) and Siete de Julio-Shushufindi (SH). The cultures were performed in the combination of Bushnell Hass (BH) + Luria Bertani (LB) and Müeller-Hinton (MH) + Brucella agar (BA) media, all with the addition of diesel to verify their efficacy in the growth of bacteria capable of surviving in contaminated media. The combination with ideal results was that of BH + LB, by means of Gram-staining it was determined that 19 of the samples had interest microorganisms. To characterize the isolates at the species level, biochemical tests of: catalase, citrate, glucose, hemolytic activity and urease were applied, which allowed to confirm the existence of the Pseudomonas of interest. The results indicated that P. stutzeri (in samples S1 and M1), P. aeruginosa (in SH2 and SH5) and P. putida (in S7, S8, S10 and SH4) obtaining a total of 8 isolates (40%) of interest from the initial 19. With the results obtained from this work, an optimal culture method was standardized for the selection of bacteria with potential for treating contaminated soils and water.

12

Exploring the characterization, liberation and flotation response of a Nigerian low-grade copper ore

72%

Nheta W. , Ola-Omole O. O.

Journal of Sustainable Mining

|

2023

|

tom Vol. 22, iss. 1

20--32

EN

This study explores the characterization, liberation and flotation response of low-grade copper ore from Anka area, Zamfara state Nigeria. The ore was crushed, milled and sieved in accordance with BS 410 standard. It was characterized with XRD, XRF, SEM-EDS and AAS. Froth flotation was carried out with varying %solids, pH, retention time and collector dosages using SEX and sodium oleate. Particle size distribution of the ore shows its economic liberation between -150 and +106 µm while 80% passing corresponds to 175.7 µm using the Gaudin Schuhmann equation. However, according to metallurgical balance calculation, 63 µm proved to have the highest metal content. Identified peaks of the copper ore by XRD revealed the presence of pyrite and chalcopyrite as the major mineral content at 47 and 36%, respectively, while other elements were present in traces. XRF shows Fe and Cu as the major elements and others in traces. Morphology, according to SEM-EDS, revealed that Fe is the major impurity while the presence of Cu and S confirmed chalcopyrite is present in the ore minerals. AAS shows an average of 25.87% Cu and 32% Fe in the ore. Optimum recoveries of copper were recorded at 30% solids, pH of 8, 30 minutes retention time. The highest recovery of 95.94% was recorded with SEX at 0.25 mol/dm3, while recoveries were lower with PAX, the highest recovery being 33% at 0.20 mol/dm3. 0.25 mol/dm3 of SEX recorded the highest yield and enrichment ratio of 40.38 and 2.38, respectively.

13

Jeux et hasard dans l’écriture de Patrick Modiano

72%

Grenaudier-Klijn F.

Quêtes littéraires

|

2023

|

nr 13

184-194

EN

Many of Patrick Modiano’s novels involve the motif of the game – predicate and space – in the narration, at characterization, thematic and structural levels. The introduction of this minor element – it never reaches the level of a trope – nonetheless informs us both about the novelistic techniques employed by Modiano and about the metaphysical considerations underpinning his writing. As such, a close reading of various episodes articulated around the motif of the game allows us to better understand the methods adopted by the novelist in the development of his characters and in the architecture of his texts. Furthermore, the insertion of the motif of the game allows us to identify and analyse the value given to chance and indeterminacy in all its forms in the Modianian novel, from which a true metaphysics, if not an ethics, of indeterminacy, can in turn be deployed.

FR

De nombreux romans de Patrick Modiano font intervenir le motif du jeu – prédicat et espace – dans la narration, aux niveaux actoriel, thématique et structural. L’introduction de cet élément mineur – il ne s’agit pas d’un thème – nous renseigne toutefois autant sur la technique romanesque employée par Modiano que sur les considérations métaphysiques sous-tendant son écriture. Une lecture attentive centrée sur divers épisodes articulés autour du jeu nous permet ainsi de mieux comprendre les modalités adoptées par l’écrivain dans l’élaboration de ses personnages et dans l’architecture de ses récits. L’insertion du motif du jeu nous permet en outre d’identifier et d’analyser la valeur accordée au hasard et à l’indéterminabilité sous toutes ses formes dans le récit modianien, à partir duquel se déploie une véritable métaphysique, voire une éthique, de l’indétermination.

14

An improved model-based vessel tracking algorithm with application to computed tomography angiography

72%

Bołdak C. , Rolland Y. , Toumoulin C.

Biocybernetics and Biomedical Engineering

|

2003

|

tom Vol. 23, no. 1

41-63

EN

This paper reports newest improvements proposed for the segmentation and the characterisation of three-dimensional vessels observed through Computed Tomography Angiography using geometrical moments. Several adaptive controls are introduced, which allow to deal with pathological patterns such as dense and scaterred calcifications. The reduced time computation makes the algorithm capable to face clinical constraints in routine use. Examples are given on several data sets that highlight critical situations to handle.

15

Vom rechten Handeln in rechtloser Zeit – Ernst Wiecherts Novelle „Der Richter”

72%

Büttner M. , Oberstudienrat G. f. d. F. G.

Acta Universitatis Lodziensis. Folia Germanica

|

2015

|

tom 11

EN

The novella "The Judge" by Ernst Wiechert gives testimony to the poet’s critical analysis and examination of the immediate National Socialist past and, at the same time, tries to provide some forward-looking re-orientation in terms of a comprehensive humanism based on Christian ideals. Wiechert’s narrative follows a dramatic structure in accordance with the tragedies of Classical Greek Antiquity. Faced with an existential crisis, the title character has to prove his moral integrity and steadfastness. Deluded by the pervasive Nazi ideology, the judge’s son goes astray by killing a former friend but finally, thanks to his father’s cautious, gentle guidance, finds his way back. At the end of the novella the son even atones for his wrongs while his father, an unfaltering representative and unswerving advocate of law and justice, resigns from his office in the face of the lawlessness he has experienced under the Nazi terror regime. Apart from analysing the plot of Wiechert’s novella, this study also examines the clearly outlined characters as well as the complex theme of guilt, repentance and forgiveness. Finally, the article focuses on the author’s intention of taking part in the social and political discourse of post-war Germany by conveying his message of humanity and moral integrity.

16

Badania nad możliwością zagospodarowania odpadów z procesu flotacji rud cynku i ołowiu

72%

Lipowska B. , Wojsa J.

Prace Instytutu Szkła, Ceramiki, Materiałów Ogniotrwałych i Budowlanych

|

2008

|

tom R. 1, nr 1

85-92

PL

W pracy podjęto próbę określenia możliwości zestalenia odpadów z procesu flotacji rud cynku i ołowiu z jednoczesnym trwałym związaniem lub usunięciem zawartych w nich szkodliwych związków. Do zestalania wykorzystano własności wiążące składników odpadu: wiązanie za pomocą cementu Sorela oraz proces karbonizacji wodorotlenków wapnia i magnezu. Zestalany odpad poddawano granulacji lub formowano z niego kształtki na prasie hydraulicznej. Najlepsze wyniki uzyskano, formując odpowiednio spreparowany odpad pod ciśnieniem 30 MPa i poddając go działaniu CO2 w podwyższonej temperaturze. Tak zagęszczony materiał wykazuje wytrzymałość na ściskanie nie mniejszą niż 5 MPa i nie ulega rozmywaniu w wodzie. W dodatkowej obróbce termicznej odpadu toksyczne składniki zostają unieszkodliwione poprzez rozkład lub przemiany w formy nierozpuszczalne w wodzie.

EN

The aim of the research presented in this work was to establish the posssibilities of solidyfying waste from the process of zinc and lead ores' flotation with a simultaneous permanent binding or removal of the harmful compounds they contain. Solidifying properties of waste components were used, in particular binding by means of Sorel cement. and the process of calcium and magnesium hydroxides' carbonisation. The solidified waste was subjected to granulation or formed into shapes in hydraulic press. The best results were obtained when the appropriately prepared waste was subjected to pressure of 30 MPa and exposed to CO2 in an increased temperature. So condensed material is characterised by compression strength no lower than 5 MPa and does not wash in water. Owing to additionally applied thermal treatment of waste the toxic components are made harmless through decomposition or transformation into forms insoluble in water.

17

Preparation And Properties Of Bionanocomposite Films Reinforced With Nanocellulose Isolated From Moroccan Alfa Fibres

72%

Benyoussif Y. , Aboulhrouz S. , El Achaby M. , Cherkaoui O. , Lallam A. , El Bouchti M. , Zahouily M.

Autex Research Journal

|

2015

|

tom Vol. 15, no. 3

164--172

EN

Nanocellulose (NC) were extracted from the Moroccan Alfa plant (Stipa tenacissima L.) and characterised. These Alfa cellulosic nanoparticles were used as reinforcing phase to prepare bionanocomposite films using carboxymethyl cellulose as matrix. These films were obtained by the casting/evaporation method. The crystallinity of NC was analysed by X-ray diffraction, the dimension of NC by atomic force microscopy, molecular interactions due to incorporation of NC in carboxymethyl cellulose (CMC) matrix were supported by Fourier transforms infrared (FTIR) spectroscopy. The properties of the ensuing bionanocomposite films were investigated using tensile tests, water vapour permeability (WVP) study and thermogravimetric analysis. With the progress of purification treatment of cellulose, the crystallinity is improved compared to the untreated fibres; this can be explained by the disappearance of the amorphous areas in cellulose chain of the plant. Consequently, the tensile modulus and tensile strength of CMC film increased by 60 and 47%, respectively, in the bionanocomposite films with 10 wt% of NC, and decrease by 8.6% for WVP with the same content of NC. The NC obtained from the Moroccan Alfa fibres can be used as a reinforcing agent for the preparation of bionanocomposites, and they have a high potential for the development of completely biodegradable food packaging materials.

18

Characterisation of some generalised continuous distributions by doubly truncated moments

72%

Athar H. , Ahsanullah M. , Ali M. A.

Operations Research and Decisions

|

2023

|

tom 33

|

nr 1

EN

The characterisation of probability distribution plays an important role in statistical studies. There are various methods of characterisation available in the literature. The characterisation using truncated moments limits the observations; hence, researchers may save time and cost. In this paper, the characterisation of three general forms of continuous distributions based on doubly truncated moments has been studied. The results are given simply and explicitly. Further, the results have been applied to some well-known continuous distributions.

19

Characterisation of some generalised continuous distributions by doubly truncated moments

72%

Athar H. , Ahsanullah M. , Ali M. A.

Operations Research and Decisions

|

2023

|

tom Vol. 33, No. 1

1--19

EN

The characterisation of probability distribution plays an important role in statistical studies. There are various methods of characterisation available in the literature. The characterisation using truncated moments limits the observations; hence, researchers may save time and cost. In this paper, the characterisation of three general forms of continuous distributions based on doubly truncated moments has been studied. The results are given simply and explicitly. Further, the results have been applied to some well-known continuous distributions.

20

Objective assessment for characterising the flatness of garment sewing stitches

72%

Jiang H. , Liu J. , Chai Z. , Wang C. , Zhang M.

Autex Research Journal

|

2013

|

tom Vol. 13, no. 4

110--117

EN

In this paper, a novel classification method of assessing garment sewing stitch based on amended bi-dimensional empirical mode decomposition (ABEMD) has been introduced. Two parameters that characterise garment sewing stitch, average area and standard deviation, have been defined based on the grey value of pixels. Experimental results showed that when the window size is 512×128 pixels with regard to average area, the threshold can be decided as 6.00, 5.50, 5.30 and 4.00 for five different grades , respectively. Meanwhile, with regard to standard deviation, the threshold can be decided as 48.00, 40.00, 30.00 and 20.00, respectively. It is demonstrated that the parameters are effective in discriminating sewing stitch images in terms of the grades when used as inputs for the ABEMD. The performance of the algorithm on different garment status is significantly reliable.