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Wyświetlanie 1-15 z 157
Tytuł:
Sintered Diamond Tools - the Past, Present and Future
Autorzy:
Konstanty, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2049735.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sintered diamond tools
synthetic diamond
tool design
Opis:
The methods of making diamond tools have undergone a remarkable development since the invention of synthetic diamond in the mid-1950s. The current review summarises key historical, recent and ongoing trends and developments in sintered diamond tools. The report concentrates on tools used within the stone and construction industries which, being the main consumers of metal-bonded diamond tools fabricated by powder metallurgy (P/M) technology, have always fuelled advances in tool design and production technologies.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 2; 593-599
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Properties of Ni/Diamond Nanocrystalline Coatings
Autorzy:
Mazurek, A.
Trzaska, M.
Powiązania:
https://bibliotekanauki.pl/articles/350997.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
diamond
nickel/diamond
composite coatings
Opis:
This paper presents the results of research of Ni/diamond composite coatings produced by electrochemical reduction method. Research was focused on composite coatings with nickel matrix and diamond as a disperse phase and for comparison purposes on nanocrystalline nickel coatings. Ni/diamond composite coatings were produced in baths with different content of nanodiamond powder. The structures of the dispersed phase and the composite coatings were analysed by using X-ray diffraction, scanning electron microscopy and light microscopy. Measurements of selected properties of the coatings were performed, including roughness, microhardness, adhesion and abrasive wear resistance. The research results indicate that the produced coatings have a compact structure and good adherence to steel substrate. Moreover, nanocrystalline Ni/diamond composite coatings exhibit greater hardness and reduced abrasive wear resistance compared to nanocrystalline nickel coatings.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1309-1314
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of the creation of territorial complexes on the world diamond market
Autorzy:
Pototskaya, Tatyana Ivanovna
Powiązania:
https://bibliotekanauki.pl/articles/1052896.pdf
Data publikacji:
2016-12-15
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
diamond complex'
diamond market
diamond pipeline
territorial-industrial complex
cluster
Russia
Opis:
The main focus of the paper is on one of the most significant issues of economic geography nowadays, namely ways of an efficient distribution of facilities on the basis of inter-industry complexity (on the example of the diamond industry). The description of the formation of the complex branch of the diamond industry is carried out in several stages: determining the cause of inter-sectoral cooperation in the diamond industry; investigating territorial features of the complex that belongs to ABA, the most important of which is the difficulty of forming the WPK national (country) level; defining a cluster as the main form of territorial complexity characteristic of ABK (its types and causes of formation, characteristics of each cluster); and drawing conclusions about the appropriate degree of territorial concentration of various activities under the ABA type of market for which they are characterised. Special attention is paid to the identification and examination of territorial complexity types in the diamond complex in Russia.
Źródło:
Quaestiones Geographicae; 2016, 35, 4; 81-91
0137-477X
2081-6383
Pojawia się w:
Quaestiones Geographicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors affecting diamond retention in powder metallurgy diamond tools
Czynniki decydujące o własnościach retencyjnych osnowy w narzędziowych spiekach metaliczno-diamentowych
Autorzy:
Romański, A.
Powiązania:
https://bibliotekanauki.pl/articles/353422.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
narzędzia diamentowe
retencja diamentu
modelowanie komputerowe
właściwości mechaniczne
PM diamond tools
diamond retention
computer modelling
mechanical properties
Opis:
This paper describes the effects of principle factors which have an influence on potential diamond retention capabilities in powder metallurgy diamond tools. Investigations were carried out using a 3-D computer model of diamond particle embedded in a metallic matrix. The proposed model assumed that the material was fully densified by the hot pressing technique and then cooled down to room temperature. The energies of plastic and elastic deformation of the matrix around the diamond grit as well as recoverable strain energy accumulated in the grit on cooling were calculated. The effects of Young's modulus and yield strength of the matrix as well as friction between diamond and matrix on these energies were analysed. The obtained results have shown that a matrix characterised by high yield strength ensures better diamond retention capacity whereas high Young's modulus of the matrix and its chemical affinity to carbon, which increases friction at the diamond-matrix interface seem to have lower importance.
W pracy przedstawiono analizę wpływu podstawowych czynników mających wpływ na własności retencyjne materiału osnowy w narzędziowych spiekach metaliczno-diamentowych. Badania wykonano z zastosowaniem modeli 3-D cząstki diamentu osadzonej w osnowie. W zaproponowanym modelu założono, że materiał został zagęszczony do gęstości teoretycznej w wyniku prasowania na gorąco i następnie ochłodzony do temperatury otoczenia. Dla temperatury otoczenia obliczano całkowitą energię odkształcenia oraz energię odkształcenia plastycznego materiału osnowy wokół diamentu oraz energię odkształcenia sprężystego cząstki diamentu. Analizie poddano wpływ modułu Younga i granicy plastyczności osnowy oraz współczynnika tarcia pomiędzy cząstką diamentu i osnową na te energie. W wyniku analizy otrzymanych rezultatów badań modelowych stwierdzono, że materiał osnowy odznaczający się większą granicą plastyczności zapewnia wyższe własności retencyjne osnowy. Natomiast większy moduł Younga oraz zwiększenie współczynnika tarcia, np. poprzez zastosowanie osnowy odznaczającej się powinowactwem chemicznym do węgla mają z punktu widzenia retencji diamentu mniejsze znaczenie.
Źródło:
Archives of Metallurgy and Materials; 2010, 55, 4; 1073-1081
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On diamond sequences
Autorzy:
Matet, Pierre
Powiązania:
https://bibliotekanauki.pl/articles/1215689.pdf
Data publikacji:
1988
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Fundamenta Mathematicae; 1988, 131, 1; 35-44
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diamond side resonances: influence of isotopic substitution of carbon
Autorzy:
Ivanov, A. A.
Ivanov, A. I.
Powiązania:
https://bibliotekanauki.pl/articles/1940702.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska
Tematy:
diamond
hyperfine structure
side resonances
Opis:
We discuss the side resonances of the optically detected magnetic resonance in a diamond crystal and propose a new approach to the calculation of the hyperfine interaction in a composed system consisting of a negatively charged nitrogen-vacancy NV- center and a nearby 13C nuclear spin. The energy levels, rule selection and radiative transitions are obtained by a new method. The base of this method is the use of a complete set of commuting operators and entangled spin states. An estimation of the carbon hyperfine splitting parameters in the diamond NV- center from side-resonance frequencies is obtained in the frame of this method.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2017, 21, 2; 173-176
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of diamond powder in the ionization process
Autorzy:
Brzecka, P.
Janaszczyk, A.
Chuchracki, M.
Mitura, K.
Powiązania:
https://bibliotekanauki.pl/articles/284028.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
diamond powder
ionization
allergic reaction
Źródło:
Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 86
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of diamond-like carbon coatings on PDMS substrates
Autorzy:
Kaczorowski, W.
Wojciechowska, A.
Niedzielski, P.
Powiązania:
https://bibliotekanauki.pl/articles/284512.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
diamond-like carbon (DLC)
PDMS
substrates
Źródło:
Engineering of Biomaterials; 2016, 19, 138; 118
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Basics of the superfinishing results prognostication by the diamond lapping films
Autorzy:
Kacalak, W.
Tandecka, K.
Powiązania:
https://bibliotekanauki.pl/articles/100181.pdf
Data publikacji:
2012
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
microfinishing film
abrasive grain
superfinishing
diamond
coated abrasives
Opis:
Superfinishing with the use of diamond lapping films differs to a significant extent from other machining methods. This is finishing surface machining, one which is realized by a slow rewinding of a microfinishing film, putting it in an oscillating motion and pressing the tool to the surface being machined. The surface being machined moves with a speed which is substantially greater than that of the tool feed. A characteristic feature of the process is a one-time use of the tool, the result being a need of an optimal selection of the machining parameters. Investigations of the topography of the microfinishing film surface were conducted with the use of new parameters that describe the arrangement and the shape of the vertices of active grains. The following were used for the purpose of assessment: coefficients that had been developed that describe the features of the shape of the tool surface, such as the standardized coefficient of the flatness of vertices wNki, the standardized number of vertices in relation to an area unit LNwi and the dissipation coefficient of the height of the location of vertices wNrwi. For the purpose of the assessment of the smoothening ability of diamond lapping films the smoothening potential coefficient wp was developed, which is defined as the geometric mean of the abovementioned indices.
Źródło:
Journal of Machine Engineering; 2012, 12, 4; 49-62
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processing and Characterization of Fe-Cu-Ni Sinters Prepared by Ball Milling and Hot Pressing
Autorzy:
Borowiecka-Jamrozek, J.
Powiązania:
https://bibliotekanauki.pl/articles/354394.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
matrix
diamond
hot pressing
diamond tools
Opis:
The main objective of the present work was to determine the effect of powder composition on microstructure and properties of iron-base materials used as matrices in diamond impregnated tools. The Fe-Cu-Ni powders premixed and ball-milled for 30 hours, were used for the experiments. The influence of manufacturing process parameters on microstructure and mechanical properties of produced sinters was investigated. Sintering was done by hot-pressing technique in graphite mould. The powders were consolidated to a virtually pore-free condition during 3 minutes hold at 35 MPa and 900°C. Investigations of the sintered materials included: density, hardness, static tensile test and X-ray diffraction (XRD) analysis. Microstructural and fractographic observations were also made with a scanning electron microscope (SEM). The obtained results indicate that the sintered parts have a high density, close to the theoretical value, good plasticity, relatively high hardness and yield strength, and are characterized by a coarse-grained microstructure.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1157-1161
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diamonds in ureilites
Autorzy:
Jakubowski, T.
Karczemska, A.
Kozanecki, M.
Powiązania:
https://bibliotekanauki.pl/articles/411500.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
właściwości diamentu i aplikacje
diament
meteoryt
spektroskopia Ramana
diamond properties and applications
diamond
meteorite
ureilite
Opis:
The presence of diamonds in meteorites was confirmed for the first time in the Novo-Ureiureilite in 1888. Ureilites are a rare class of achondrites, often referred to as primitive achondrites. They are composed of olivine and pyroxene (pygeonite), as well as graphite inclusions often coexisting with diamonds. The following three main hypotheses of diamond origin in ureilites have been proposed: the HPHT process, graphite-to-diamond conversion under shock compression due to impact on the parent body (the most popular theory, as of the time of publication), and the CVD process in the solar nebula. The samples of all types of ureilites, from less shocked up to highly shocked, were examined using Raman Spectroscopy and Scanning Electron Microscopy. The results show the presence of diamonds in all of our samples. Of particular significance is the comparison of Raman spectra of diamonds and graphite phases of different ureilites.
Źródło:
Meteorites; 2011, 0, 0; 3-8
2299-0313
2299-1220
Pojawia się w:
Meteorites
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes In Competitiveness Among The Visegrad Countries After Accession To The European Union: A Comparative Analysis Based On A Generalized Double Diamond Model
Autorzy:
Molendowski, Edward
Żmuda, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/632915.pdf
Data publikacji:
2013-12-01
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
international competitiveness
Visegrad Group countries
Porter’s diamond
double diamond model
small open economy
Opis:
National competitiveness is a buzzword that awakens much interest and controversy. In its broadest perspective, it is seen as a modern way of describing the development efforts of nations in the times of globalization (Reinert 2001, p. 23-42). This means that forces driving the changes in the global economy: liberalization of international trade, booming investment by multinational enterprises and development of regional integration groupings, need to be included into the competitiveness model. Well-known and commonly used approach to national competitiveness: Porter’s diamond of competitive advantage does not however capture this international context. By concentrating solely on the elements of the domestic environment, the model does not show the complicated international linkages that have shaped the competitiveness of many countries. Especially in the case of small, open ‘catching-up’ economies, assessing national competitiveness solely on the basis of the potential of domestic companies, based on local conditions, does not fully reflect their developmental context, which is also driven by the complex networks of international interdependencies. Building upon the generalized double diamond model developed by Moon et al. (2000), this paper explores the extent to which economic relations with international partners and the activities oftransnational corporations affect the competitiveness of the Visegrad Group countries, and how this relationship has been changing in the post-accession period. To answer the research problem posed, Eurostat and Global Competitiveness Report data have been gathered to assess the competitiveness variables on both the domestic/national and international levels. It has been shown that integration within the global economy constitutes an essential element of competitiveness for each of the analysed countries.
Źródło:
Comparative Economic Research. Central and Eastern Europe; 2013, 16, 4; 121-153
1508-2008
2082-6737
Pojawia się w:
Comparative Economic Research. Central and Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D simulations of diamond microfluidic devices
Autorzy:
Witkowski, D.
Obidowski, D.
Łysko, J.
Karczemska, A.
Powiązania:
https://bibliotekanauki.pl/articles/285490.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
przyrządy mikrofluidyczne
Coventor
ciepło Joule'a
diamond microfluidic devices
Joule heating
Opis:
The aim of this study was to optimize the diamond microfluidic device with four microchannels. The temperature distributions in electrophoretic microchips of different geometries and different materials have been analyzed by the Coventor software. Diamond microfluidic devices are very advantageous over glass or polymer microfluidic devices; they dissipate Joule heat much more efficiently because of the highest thermal conductivity coefficient of diamond.
Źródło:
Engineering of Biomaterials; 2009, 12, 86; 14-16
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 157

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