Wyniki wyszukiwania - Biblioteka Nauki

1

Holdings’ Level of Complexity During the Crisis[1]

100%

Mierzejewska W.

Journal of Management and Financial Sciences

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2014

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tom 18(4)

35-47

EN

The article presents the way the level of complexity of holdings was changing. The qualitative research made it possible to verify whether holdings modify their structure in response to the worse performance during a crisis period. 1 The article presents results of research carried out as a part of the National Science Centre research project 2011/03/13/HSR/04922 entitled “Determinants of Polish Enterprises’ Resistance to the Macroeconomic Crisis”.

2

Modification of grinders of biomaterials used for energy purposes

100%

Tomporowski A. , Mroziński A.

Journal of Polish CIMAC

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2011

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tom Vol. 6, no 3

327-338

EN

Grinding of biological materials is an energy-consuming process. During grain decohesion, complex strain state occurs induced by compressing, twisting, bending, tearing, cracking, grinding or shearing. The work attempts to find structural solutions of the grinding and process control system enabling to increase rice grinding functionality: efficiency, energy-saving and regularity. The practical aim was to develop the methodology for innovative research on grain grinding which supports development of grinders. Based on theoretical discussions and earlier scientific research, it can be concluded that it is possible to obtain optimal quality of material being ground and satisfactory functionality of the rice grain grinding process within a permissible range of values of the multi-disc grinder structural features. The exceeding of these values will result in the worsening of the process effectiveness and the quality of a grinding product. Finding relations between functionality, operation regularity, selected movement and energy related characteristics of the grinding process and structural features of the biomaterial grinding unit justifies the need for carrying out an analysis, studies and experiments with quasi-shearing in order to determine the indexes of the research object model variables.

3

Pierwszy powojenny Plan Śródmieścia samorządowej Gdyni

100%

Bańkowska B.

Studia komitetu przestrzennego zagospodarowania kraju PAN

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2018

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tom 188

134-146

4

Structural connections between the NE part of the Carpathian Basin and Ukrainian forelands

100%

Kozak M. , Puspoki Z. , Gonczy S.

Biuletyn Państwowego Instytutu Geologicznego

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1999

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tom nr 387

127--129

5

Unfolding simulation to verify the concept of limited conformational sub-space for early-stage intermediate

100%

Kiełkowicz P. , Roterman I.

Bio-Algorithms and Med-Systems

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2009

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tom Vol. 5, no. 10

15--23

EN

Model introducing the limited conformational sub-space for early-stage intermediate definition for protein folding process presented formerly is verified in respect to the unfolding process treated as reverse process to folding. It was expected to receive the step-wise unfolded structure keeping the structural alphabet. It is shown that as long as the secondary structure is present in the gradually unfolded structures, the codes for structural alphabet are changed for relatively low number of residues. The high temperature molecular dynamics simulations revealed the structures with significantly increased distance versus the limited conformational sub-space and large change of alphabet codes. The test was performed for ubiquitine in 300K, 350K, 400K, 500K, 700K and 1000K. It suggests that the structural codes found for crystal structures can not be treated rigorously to be kept during the folding process simulation. Although some tendencies for structural codes changes are observed suggesting the corrections for the definition of early stage structural forms.

6

Topography and the structure of the surface of polyamide - glass composites after the ageing process

100%

Pusz A. , Szymiczek M. , Michalik K.

Journal of Achievements in Materials and Manufacturing Engineering

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2011

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tom Vol. 44, nr 1

42--49

EN

Purpose: Polymers have found applications in such diverse biomedical fields as tissue engineering, implantation of medical devices and artificial organs, prostheses, ophthalmology, dentistry, bone repair and many other medical fields. The requirements for materials used in the construction of removable dentures are becoming more and more demanding. The introduction of improved flexible materials has been a considerable advance. The aim of this work was to determine how the structure of thermoplastic materials changes over time in terms of weight changes and artificial saliva sorption. Purpose of this paper was to evaluate the influence of the ageing process on structure of polyamide - glass composites applied in dentistry. Design/methodology/approach: Polyamide samples about the diversified content of the glass fibre were produced with method of the injection moulding. Denotation the absorbency of artificial saliva was performed on standardized samples according to the norm. Samples were dried off to fixed mass, and then they were soaked in artificial saliva. Three temperatures of examination were applied 20°C, 35°C and 50°C. Findings: Examinations allowed to show that the absorbency of artificial saliva through composite is dependent on the temperature. Research limitations/implications: To fully evaluate the influence of the ageing process on mechanical properties of polyamide - glass composites applied in human body environment it is planned to continue described research. Simultaneous influence of the ageing process on mechanical properties of polyamide - glass composites will be tested. Originality/value: Applying strengthened thermoplastics with glass fibre on dentures is a new look at materials applied in dentistry.

7

Modern composite materials manufactured by pressure infiltration method

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Dobrzański L. , Kremzer M. , Drak M.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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tom Vol. 30, nr 2

121-128

EN

Purpose: The purpose of this paper is to present the technique of manufacturing the composite materials based on porous ceramic preforms infiltrated by liquid aluminium alloy and examination of the structure and corrosion resistance of those materials. Design/methodology/approach: The material for investigations was manufactured by pressure infiltration method of ceramic porous preforms. The eutectic aluminium alloy EN AC-AlSi12 was use as a matrix while as reinforcement were used ceramic preforms manufactured by sintering of Al₂O₃ Alcoa CL 2500 powder with addition of pore forming agents as carbon fibres Sigrafil C10 M250 UNS manufactured by SGL Carbon Group Company. To determine the corrosion resistance, corrosion test by potentiodynamic method were made consisting in registering the anode polarization curves using the measurements system consisting of the potentiostat PGP-201 working with the Radiometer Copenhagen VoltaMaster 4 software. Findings: The received results show the possibility of obtaining the new composite materials with required structure and corrosion resistance depends of the volume fraction of the reinforcing phase. Practical implications: The composite materials manufactured by the developed method can find application among the others in automotive, aircraft or marine industry as the alternative material for elements fabricated from unreinforced aluminium alloys. Originality/value: The obtained results show the possibility of manufacturing the composite materials by the method of porous sintered framework pressure infiltration based on the ceramic particles, characterized with the better corrosion resistance than aluminium alloy used as the matrix.

8

Structural Features in Ernst Schröder’s Work. Part II

100%

Bondoni D.

Logic and Logical Philosophy

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2012

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tom 21

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nr 3

271-315

EN

In this paper (the second of two parts) we propose a structural interpretation of Schroder’s work, pointing out his insistence on the priority of a whole in comparison with its parts. The examples are taken from the diverse areas in which Schroder was active, with a particular interest in his project of an absolute algebra.

9

Influence of deposition temperature on amorphous structure of PECVD deposited a-Si:H thin films

100%

Müllerová J. , Fischer M. , Netrvalová M. , Zeman M. , Šutta P.

Open Physics

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2011

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tom 9

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nr 5

1301-1308

EN

The effect of deposition temperature on the structural and optical properties of amorphous hydrogenated silicon (a-Si:H) thin films deposited by plasma-enhanced chemical vapour deposition (PECVD) from silane diluted with hydrogen was under study. The series of thin films deposited at the deposition temperatures of 50–200°C were inspected by XRD, Raman spectroscopy and UV Vis spectrophotometry. All samples were found to be amorphous with no presence of the crystalline phase. Ordered silicon hydride regions were proved by XRD. Raman measurement analysis substantiated the results received from XRD showing that with increasing deposition temperature silicon-silicon bond-angle fluctuation decreases. The optical characterization based on transmittance spectra in the visible region presented that the refractive index exhibits upward trend with increasing deposition temperature, which can be caused by the densification of the amorphous network. We found out that the scale factor of the Tauc plot increases with the deposition temperature. This behaviour can be attributed to the increasing ordering of silicon hydride regions. The Tauc band gap energy, the iso-absorption value their difference were not particularly influenced by the deposition temperature. Improvements of the microstructure of the Si amorphous network have been deduced from the analysis.

10

Influence of Heat Treatment on Corrosion Resistance of ZnAl40Ti2Cu Alloy

100%

Michalik R.

Archives of Metallurgy and Materials

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2018

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tom Vol. 63, iss. 2

883--888

EN

The aim of this paper was to determine the effect of heat treatment for the corrosion resistance of the ZnAl40Ti2Cu alloy under “acid rain” conditions. ZnAl40TiCu alloy after supersaturation and after supersaturation and aging was studied. Potentiodynamic studies, potentiostatic studies and studies on structure of the alloy top layer of samples after corrosion tests were carried out. These investigations indicated a significant influence of heat treatment on corrosion resistance of the ZnAl40Ti2Cu alloy. The highest increase in corrosion resistance comparing to the alloy in the as-cast condition may be obtained by supersaturation. A significant influence of the aging temperature and time on corrosion resistance was proved.

11

Untersuchungen zum Begriff und zur Struktur des verbalen Vergangenheits-Komplexes im Deutschen unter weiterer Berücksichtigung des Polnischen, Russischen und Lateinischen

100%

Dusza S.

Annales Neophilologiarum

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2010

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nr 4

101-124

EN

The following report tries to explore the invisible structure of the German Past Tense. Many problems with the unambiguous description of the conjugation of Past Tense forms are the base for an examination of their dual nature: are the injected intruders by the conjugation of regular verbs a part of the endings or a part of verbal stem? The answer, they are solely one of the time indicators with their strong, auxiliary position to the passive verb stem, is not possible without many didactical researching and works.

PL

Celem niniejszego artykułu jest przedstawienie hipotezy strukturalnej budowy niemieckiego czasu przeszłego prostego z perspektywy jego europejskiej biografi i. Niewyjaśnione do końca problemy z opisem kondycji oraz zadań tzw. końcówek i intruzji bądź ich spłycanie lub przemilczanie, co obserwuje się w licznych gramatykach i poradnikach, stały się podstawą do postawienia i próby udokumentowania rekonstruktywnej hipotezy, że i w tym przypadku, w tym czasie można stwierdzić istnienie reliktów zauważalnej struktury złożonej z nieodmiennej (stałej) części (rdzenia czasownika) i swoistego czasownika posiłkowego (sygnał dzielący końcówki i rdzeń, jak w języku niemieckim, ściągający je zupełnie, jak w języku rosyjskim, bądź niecałkowicie, jak w języku polskim).

12

Application of QForm forging simulation system for prediction of microstructure of aluminium forged parts

100%

Stebunov S. , Biba N. , Ovchinnikov A. , Shmelev V.

Computer Methods in Materials Science

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2007

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tom Vol. 7, No. 1

73-77

EN

Development of the simulation software of the technological processes such as forging and heat treatment provides the application of the optimization the technology for achievement the established level of mechanical properties and structure. In the work was considered prediction of the structure and properties using the parameter of Ziner-Holomon for hot forging technology of aluminum wheels. The investigations were performed for the most critical zones of the forged parts such as web, crown, upper and lower flanges of the wheels. The method of structure prediction and calculation was applied for hot forging of the wheel from the alloy AB on hydraulic press with splitted die. 1) QuantorForm Ltd., Moscow, Russia 2) Moscow Air technology university, Moscow, Russia 3) Stupino metallurgical company, Moscow region, Russia

PL

Optymalizacja procesów kucia oraz obróbki cieplnej w celu osiągnięcia zadanych właściwości mechanicznych oraz odpowiedniej struktury materiałowej możliwa jest dzięki rozbudowie oprogramowania przeznaczonego do symulacji tych dwóch procesów. W niniejszym artykule przedstawiono metodę modelowania struktury oraz właściwości materiałowych przy użyciu parametru Zenera-Holomona dla procesu kucia na gorąco felg aluminiowych. Badania przeprowadzono dla najbardziej krytycznych obszarów kutej części takich jak żebra usztywniające czy też dolnego i górnego kołnierza. Metody modelowania struktury zastosowane zostały dla kucia na gorąco dla felg z aluminium AB na prasie hydraulicznej z dzieloną matrycą.

13

Language of borders in the structure of everyday landscape

100%

Gawryszewska B. J.

Prace Komisji Krajobrazu Kulturowego

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2008

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tom nr 8

86--94

EN

Human is a part of the environment so he, together with the rest of natural factors, participates in shaping of landscapes' physiognomy. The nature creates landscapes of a specific structure. Human creates cultural landscapes by imitating those structures through exploiting natural resources. “Places” are build up on this kind of structure, and meanings of those places create a specific genius loci. Place and spirit of the place have their boundaries often conditioned more by the rules of culture than by the rules of nature. Home garden and settlement both play main roles in this phenomenological structure The author focuses on a problem of borders in cultural landscape that express themselves in landscapes as well as in garden composition. This article attempt is to describe the structure of everyday landscape that results from the way it's used in. There are private, common and public spaces in the everyday landscape, but there is also an important phenomenon of the borders between them.

14

Reengineering the topological structures of large-scale monitoring systems

100%

Beskorovainyi V. , Podoliaka K.

ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes

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2015

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tom Vol. 4, No 3

13--18

EN

As part of the solution of problem optimization of large-scale facilities carried out formalization of the system description of large-scale monitoring, defined the composition and the relationship subsets of elements, relationships, topologies and properties. Formulated the mathematical model and the task of reengineering topological structures of centralized three-tier system of largescale monitoring based on indices of cost and efficiency. The proposed mathematical model explicitly set relations between costs for the reengineering and time processing messages in the system from its structure and topology. The analysis of the objective function revealed that envelopes their local extrema are one-extreme (relative to the number of nodes in the system). Considering this, proposed a method of directed inspection of local extrema, which allow to find best solutions in terms of the minimum additional cost. Selection of the single solution from a set of effective proposed to carry out the method of hierarchy analysis or cardinalist approach aided by the additive function of general utility. The values of the weighting coefficients of the utility functions is carried out by an expert or based on comparator identification. Practical application these results allows reduce the time of obtaining solutions and more accurate solving of large dimension problem.

15

«Люблю Россию я». Жанровая традиция изображения России в лирическом жанре инвективы

100%

Краковяк А.

Acta Universitatis Lodziensis. Folia Litteraria Rossica

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2012

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tom 05

EN

The author considers a group of Russian poetic texts, aimed at political foes to Russia as a state. The author argues that these texts are samples of lyrical genre of invective, which is proved by their semantic structure and the objective of the text as a kind of poetic expression. The structure of the genre and its tradition imply specific image of Russia, which forms in all of the texts given, regardless of literary epoch and political beliefs of the poets-authors.

16

Konstrukcja mikroprzełącznika elektrostatycznego do aplikacji OXC

100%

Sulima R.

Spektrum

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2009

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tom nr 9-10

XXXIX-XLIV

PL

Przedstawiono opis modelu kompleksowego elektrostatycznej mikrostruktury grzebieniowej MEMS. Układ taki wykorzystywany może być jako przezroczysty przełącznik w sieciach optycznych DWDM. Przedstawiono opis modelu obwodowego oraz analizę mechaniczną z uwzględnieniem tłumienia w ośrodkach lepkich takich jak powietrze. Mikroprzełącznik charakteryzuje znikomymi oscylacjami podczas przełączania, przy odpowiednim doborze rozmiarów elementów sprężystych oraz elementów napędowych charakterystyka przełączania jest aperiodyczna.

EN

Described is the complex model of an electrostatic comb-drive microstructure MEMS. Such a system can be used as a transparent optical cross-connect in DWDM networks. Presented is description of a circuit model as well as the mechanic analysis considering damping effect in a viscous medium like air. The microswitch is characterized by minimal oscillations during switching and when elastic elements dimensions and drive elements are properly selected, its switching characteristic becomes aperiodic.

17

Analysis of decrease machinability possible causes for claimed alloy

100%

Náprstková N. , Kuśmierczak S.

Advances in Science and Technology. Research Journal

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2016

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tom Vol. 10, nr 31

94--101

EN

The Faculty of Production Technology and Management is often asked by companies with a request to solve a specific technical task. One of these tasks was the analysis of aluminum alloy worsened machinability when the rods from this alloy exhibited against assumption significantly worse (longer) chips during machining. The alloy was complaint and, of course, it created economic damage. Obviously, the company was interested in the causes of this alloy behavior change that could possibly generate future complaints procedures to defend itself better, or to avoid mistakes in the production of the material. At the faculty analysis that could contribute to identifying the cause of the worsened machinability were done.

18

Competitive sorption of selected anions on modified halloysite

100%

Prokop A. , Matusik J.

Geology, Geophysics and Environment

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2014

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tom Vol. 40, no. 1

118--119

EN

Halloysite is a polytype of kaolinite exhibiting a 1:1 layered structure with the chemical composition of Al4Si4O10(OH)8. Synthesis of new materials based on kaolinites has received wide attention recently (e.g. Dedzo et al. 2012). Soluble forms of chromium, arsenic and phosphorus found in excessive amounts in waters are toxic and/or carcinogenic and may cause health problems. Thus, the aim of this work was to investigate the sorption of aqueous Cr(VI), As(V), and P(V) on natural halloysite and halloysite grafted with diethanolamine. Halloysite (H) sample was obtained from the Intermark Company which exploits the Dunino deposits formed as a result of basalt weathering, located in NW Poland near Legnica. The modification consisted of two steps. Firstly, the intercalate of the mineral with dimethyl sulfoxide (DMSO) was prepared. For this purpose 12.5 g of the mineral was dispersed in a mixture of 90 mL DMSO and 10 mL H2O for 5 days at room temperature (HDMSO sample). Secondly, the HDMSO was refluxed with diethanolamine (DEA) (100 g/L ratio) for 24 h at 180°C under argon flow. The centrifuged product (HD) was washed with isopropanol and subsequently with water to remove unreacted DEA and DMSO remnants and dried at 65°C. The material was characterized using XRD, IR and SEM methods. Adsorption experiments were conducted at 5 mmol/L Cr(VI), As(V), and P(V) concentration in the single-element system for initial pH 3, 6, 9 and in mixed double-element system (1:1 anion molar ratio) for the initial pH 3. For the equilibrium studies, the H and HD samples were shaken in adequate solution (solid/solution ratio 20 g/L) for 24 h at room temperature. Afterwards, the supernatant solution was analyzed for anions. The Cr(VI) concentration was determined by 1.5-diphenylcarbazide method, while the P(V) and As(V) concentrations were determined by molybdenum blue method. The XRD confirmed the formation of an intercalate with DMSO as the characteristic d001 peak at 11.2 Å appeared. After DMSO treatment, the intensity of four distinct bands in the OH stretching region (3,700-3,600 cm-1), which are characteristic for the natural halloysite, changed as a result of interaction between the mineral and DMSO. Also the bands attributed to the C-H stretching vibrations of DMSO methyl groups were found at 3,021, 2,937 and 2,920 cm-1. The interlayer grafting of DEA led to fixing of basal spacing at 10.34 Å. After water washing the IR spectra showed only bands related to the grafted DEA molecules, which confirms the derivative stability (Matusik & Bajda 2013). As the cation exchange capacity (CEC) of the H sample is low, the adsorption process takes place mainly at the crystal edges. It was assumed that the protonated amine group of DEA will attract the anionie species. The results show that such modification does not improve the anion sorption properties of halloysite. The sorption increased only in case of Cr(VI) from 4 to 9 mmol/kg at initial pH 9 (single-element system). The highest sorption was observed in acidic system due to lack of competitive OH ions. In this case, sorption of Cr(VI) was 27 mmol/kg for H and 28 mmol/kg for HD. In contrast, the H adsorbed 108 mmol P(V)/kg in single-element system, while HD adsorbed only 50 mmol P(V)/kg. Adsorption of the As(V) was higher for the H sample and equal to 67 mmol/kg. A comparison of the obtained results for P(V) and As(V) to the sorption efficiency of HDT-MA-modified zeolites (respectively: 80 mmol/kg and 35 mmol/kg) and HDTMA-modified smectites (respectively: 75 mmol/kg and 45 mmol/kg) indicates, that the natural halloysite is a promising sorbent with regard to the studied anions (Mozgawa et al. 2011). In the single-element system the sorption increased as follows: P > As >>Cr. In turn, in the double-element system the competitive sorption was observed. Thus, the sorption of P(V) was lowered in the presence of Cr(VI), while in competitive P(V)-As(V) system the sorption of As(V) dominated. The mechanisms which contribute to the sorption were mainly surface complexation. Further investigation requires thermodynamic studies and the use of i.e. XPS (X-ray photoelectron spectroscopy).

19

Reactions of N-aryl-N-(4,5-dihydro-1H-imidazol-2-yl) hydroxylamines with methanesulfonyl chloride. Synthesis and acylation of 2,3-dihydro-1H-imidazo[1,2-a]benzimidazoles

100%

Sączewski F. , Dębowski T.

Polish Journal of Chemistry

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1998

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tom Vol. 72, nr 12

2541-2545

EN

Reactions of N-aryl-N-(4,5-dihydro-1H-imidazo-2-yl)-hydroxylamines 1a-d with methanesulfonyl chloride in the presence of triethylamine afforded 2,3-dihydroimidazo[1,2-a]benzimidazoles 2a-d. The latter compounds treated with acetic anhydride, methane or phenylsulfonyl chlorides gave N-1 acetyl or N-1 methane or phenylsulfonyl derivatives 3a-d and 4a-b, respectively.

20

Hrvatski nacionalni identitet i Europska unija

100%

Sršen A. , Piskač D.

Slavia Meridionalis

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2012

|

tom 12

EN

Croatian national identity and the European Union The permanent anthropological determinant of men which provides them with a feeling of social security is the feeling of belonging to a larger group of people. Various forms of such affiliations existed in the past. They represent older types of collective relationships, such as tribes, the Greek poleis, medieval kingdoms and the like. All of them exhibit the fundamental features of the “structure” of identity. Nowadays, Croatia being at the doorstep of the European Union, the issue of national identity becomes a matter of its internal structure that resists integration, yet seeking to become a part of the “European identity structure”. Croatia’s scepticism towards the EU stems from the questions of whether the European identity exists and which possibilities for preserving all the structural elements of Croatian national identity, including language as the main aspect, exist within the European Union. The territory, language and customs acquire defensive features that are becoming increasingly disintegrating and decreasingly integrating in the multi-ethnic Europe. Chorwacka tożsamość narodowa i Unia Europejska Trwałą determinantą antropologiczną człowieka, dającą mu poczucie bezpieczeństwa społecznego, jest świadomość przynależności do większej grupy. Niegdyś istniały różne formy takiej przynależności, a mianowicie starsze typy związków społecznych, jak plemiona, greckie polis, średniowieczne królestwa itd. Współcześnie te formy przynależności zbiorowej są związane ze strukturą narodową, z państwem-narodem lub też ze strukturą ponadnarodową, jaką jest Unia Europejska. W każdej z nich można znaleźć podstawowe cechy strukturalne w postaci tożsamości narodowej lub ponadnarodowej. Obecnie, kiedy Chorwacja oczekuje na przyjęcie do Unii Europejskiej, kwestia tożsamości narodowej staje się sprawą jej wewnętrznej struktury, która stawia opór integracji, ale jednocześnie chce być częścią ponadnarodowej „tożsamości europejskiej”. Sceptycyzm Chorwacji wobec UE wynika ze stawianych pytań: czy istnieje tożsamość europejska i jakie są możliwości zachowania wszystkich elementów chorwackiej konstrukcji tożsamości narodowej z językiem jako jej głównym komponentem w obrębie Unii Europejskiej? Terytorium, język i zwyczaje zyskują bowiem cechy defensywne, stając się w wieloetnicznej Europie czynnikiem coraz bardziej dezintegrującym, a nie służącym integracji.