PL
 |
EN
Ten serwis zostanie wyłączony 2025-02-11.
Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 15

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available remote The reactive ion etching of sapphire for molecular biology
100%
Mitura A. , Rapiejko C. , Hassard J.
|
|
tom Vol. 4, nr 1
87--90
EN
As the twentieth century was the time of technological revolution, the era of physics and electronics, many scientists judge that the twenty first century will be the century of molecular biology. The discovery of a DNA structure by Watson and Crick, published in 1953 in Nature [1], has started this new revolution. The second part of twentieth century has brought the different methods of DNA sequencing and separating, the possibility of the modifications in DNA through cloning. The Human Genome Project (HGP) [2] which will be totally finished by 2003 or sooner, will allow us to know all human genome which contains roughly 3 billion base pairs and between 30 000 and 120 000 genes. On June 26lh of 2000 President Clinton, leaders of the HGP and representatives of the biotechnology company Celera announced the completion of a "working draft" reference DNA sequence of the human genome. The achievement provides scientists worldwide with a road map to an estimated 90% Df genes on every chromosome. This quick research on human genome was possible only thanks to very rapid development of the new tools for DNA analysis. Modern DNA sequencers are automated, much quicker that conventional methods and easier to use. The next goal is to miniaturise the conventional techniques. In 1992, Manz published the first papers about separating biomolecules on the chip [3]. In 1999 the first chip was made commercially available thanks to Hewlett Packard. A lot of research is done and still is needed to be done in this subject. Very quick, modern, small and heap DNA sequencers are the aim of research in this area. Plasma technology is widely used to modify the surface properties of materials [7]. For instance chemically reactive plasmas are used in etching, films deposition, ion implantation and the unique modification of the properties of materials. In this research the process of reactive ion etching is used for manufacturing the microstructures on sapphire substrate. Sapphire is a very difficult material to etch. But the very good physical properties of sapphire put it in a special position for molecular biology. Such sapphire microdevices can be a heart of modern DNA sequencer.
2
Content available Effect of intensive cooling of alloy AM60 with chromium and vanadium additions on cast microstructure and mechanical properties
100%
Rapiejko C. , Pisarek B. , Pacyniak T.
|
|
tom Vol. 62, iss. 1
309--314
EN
The work presents the results of the investigations of the effect of intensive cooling of alloy AM60 with additions of chromium and vanadium on the microstructure and mechanical properties of the obtained casts. The experimental casts were made in ceramic moulds preliminarily heated to 180°C, into which alloy AM60 with the additions was poured. Within the implementation of the research, a comparison was made of the microstructure and mechanical properties of the casts obtained in ceramic moulds cooled at ambient temperature and the ones intensively cooled in a cooling liquid. The kinetics and dynamics the thermal effects recorded by the TDA method were compared. Metallographic tests were performed with the use of an optical microscope and the strength properties of the obtained casts were examined: UTS(Rm), elongation (A%), and HB hardness.
3
Content available Effect of Alloy Additions on the Structure and Mechanical Properties of the AlSi7Mg0.3 Alloy
100%
Pacyniak T. , Pisarek B. P. , Szymczak T. , Rapiejko C.
|
4
Content available Effect of Intensive Cooling of Alloy AC-AlSi7Mg with Alloy Additions on Microstructure and Mechanical Properties
100%
Pisarek B. , Rapiejko C. , Pacyniak T.
|
2019
|
tom Vol. 64, iss. 2
677--681
EN
The work presents results of the investigations of effect of intensive cooling of alloy AC-AlSi7Mg with alloy additions on microstructure and mechanical properties of the obtained casts. The experimental casts were made in ceramic molds preliminarily heated to 180°C, into which AC-AlSi7Mg with alloy additions was poured. Within implementation of the research, a comparison was made of the microstructure and mechanical properties of the casts obtained in ceramic molds cooled at ambient temperature and the ones intensively cooled in a cooling liquid. Kinetics and dynamics thermal effects recorded by the TDA method were compared. Metallographic tests were performed with the use of optical microscope and strength properties of the obtained casts were examined: UTS, Elongation and HB hardness.
5
Content available Benefit Effect of Low Addition Yttrium on the Phase αMg and eutectic αMg+γ(Mg17Al12) in AZ91 Alloy
100%
Mikusek D. , Rapiejko C. , Andrzejczak A. , Pacyniak T.
|
|
tom Vol. 66, iss. 1
57--63
EN
This paper presents results of a study of the effect of inoculation of yttrium on the microstructure of AZ91 alloy. The concentration of the inoculant was increased in samples in the range from 0.1% up to 0.6%. The influence of Y on the thermal effects resulting from the phase transformations occurring during the crystallisation at different inoculant concentrations were examined with the use of Derivative and Thermal Analysis (DTA). The microstructures of the samples were examined with the use of an optical microscope; and an image analysis with a statistical analysis were also carried out. Those analyses aimed at examining oh the effect of inoculation of the Y on the differences between the grain diameters of phase αMg and eutectic αMg+γ(Mg17Al12) in the prepared examined material as well as the average size of each type of grain by way of measuring their perimeters.
6
Content available Effect of Intensive Cooling of Alloy AC-ALSI7MG with Alloy Additions on Microstructure and Mechanical Properties
100%
Pisarek B. , Rapiejko C. , Pacyniak T.
|
7
Content available Effect of Alloy Additions on the Structure and Mechanical Properties of the AlSi7Mg0.3 Alloy
100%
Pisarek B. P. , Rapiejko C. , Szymczak T. , Pacyniak T.
|
|
tom Vol. 17, iss. 1
137--142
EN
The study presents the results of the investigations of the effect of Cu, Ni, Cr, V, Mo and W alloy additions on the microstructure and mechanical properties of the AlSi7Mg0.3 alloy. The examinations were performed within a project the aim of which is to elaborate an experimental and industrial technology of producing elements of machines and devices complex in their construction, made of aluminium alloys by the method of precision investment casting. It was demonstrated that a proper combination of alloy additions causes the crystallization of complex intermetallic phases in the silumin, shortens the SDAS and improves the strength properties: Rm, Rp0.2,HB hardness. Elevating these properties reduces At, which, in consequence, lowers the quality index Q of the alloy of the obtained casts. Experimental casts were made in ceramic moulds preliminarily heated to 160 °C, into which the AlSi7Mg0.3 alloy with the additions was cast, followed by its cooling at ambient temperature. With the purpose of increasing the value of the quality index Q, it is recommended that the process of alloy cooling in the ceramic mould be intensified and/or a thermal treatment of the casts be performed (ageing) (T6).
8
Content available Analysis of Am60 and Az91 Alloy Crystallisation in Ceramic Moulds by Thermal Derivative Analysis (Tda)/ Analiza Krystalizacji Stopów Am60 I Az91 W Formie Ceramicznej Metodą Analizy Termiczno-Derywacyjnej (Atd)
100%
Rapiejko C. , Czekaj E. , Pacyniak T. , Pisarek B.
|
|
nr 4
9
Content available Effect of Inoculant Emgesal® Flux 5 on the Microstructure of Magnesium Alloy AZ91
100%
Rapiejko C. , Mikusek D. , Andrzejczak A. , Pacyniak T.
|
|
tom iss. 2
15--20
EN
This work presents the results of the research of the effect of the inoculant Emgesal Flux 5 on the microstructure of the magnesium alloy AZ91. The concentration of the inoculant was increased in samples in the range from 0.1% to 0.6%. The thermal processes were examined with the use of Derivative and Thermal Analysis (DTA). During the examination, the DTA samplers were preheated up to 180 °C. A particular attention was paid to finding the optimum amount of inoculant, which would cause fragmentation of the microstructure. The concentration of each element was verified by means of a spark spectrometer. In addition, the microstructures of the samples were examined with the use of an optical microscope, and an image analysis with a statistical analysis using the NIS-Elements program were carried out. Those analyses aimed at examining the differences between the grain diameters of phase αMg and eutectic αMg+γ(Mg17Al12) in the prepared samples as well as the average size of each type of grain by way of measuring their perimeters. This paper is an introduction to a further research of grain refinement in magnesium alloys, especially AZ91. Another purpose of this research is to achieve better micro-structure fragmentation of magnesium alloys without the related changes of the chemical composition, which should improve the mechanical properties.
10
Content available Effect of Inhibitor Coating of a Ceramic Mould on the Surface Quality of an AM60 Alloy Cast with Cr and V
100%
Pacyniak T. , Pisarek B. P. , Rapiejko C. , Święcik R.
|
|
nr 3
11
Content available Benefit Effect of Low Addition Yttrium on the Phase αMg and Eutectic αMg + γ(Mg17Al12) in AZ91 Alloy
89%
Mikusek D. , Rapiejko C. , Andrzejczak A. , Pacyniak T. , Mikusek D. , Rapiejko C. , Andrzejczak A. , Pacyniak T.
|
|
nr 1
12
Content available Effect of Gadolinium on the Microstructure of Magnesium Alloy AZ91
89%
Rapiejko C. , Mikusek D. , Just P. , Pacyniak T. , Rapiejko C. , Mikusek D. , Just P. , Pacyniak T.
|
|
nr 1
13
Content available Effect of intensive cooling of alloy AM60 with chromium and vanadium additions on cast microstructure and mechanical properties
75%
Pacyniak T. , Rapiejko C. , Pisarek B.
|
14
Nanokrystaliczny diament dla medycyny
63%
Mitura S. , Bąkowicz K. , Bogusławski G. , Cłapa M. , Dobrowolska A. , Grabarczyk J. , Niedzielski P. , Rapiejko C. , Sokołowska A.
|
|
tom R. XXI, nr 3
120-124
PL
Unikatowe właściwości cienkich warstw diamentowych czynią je perspektywicznym materiałem dla zastosowań w urządzeniach mikroelektronicznych, jako powłok dla narzędzi skrawających oraz w optyce. Jednak, ze względu na wysoką biokompatybilność węgla spowodowaną jego obecnością w organiźmie, może on stać się znakomitym biomateriałem. Jednym z zastosowań warstw węglowych są powłoki implantów medycznych. Badania warstw węglowych jako powłok implantów w chirurgii składały się z badań odporności biologicznej wszczepów, badań histopatologicznych zwierząt w laboratorium, testów na odporność korozyjną, pomiarów właściwości mechanicznych oraz napięć przebicia w płynie Tyroda.
EN
The unique properties of thin diamond layers make them perspective candidates for producing advanced micro-electronic devices, coatings for cutting tools and optics. However, due to the highest biocompatibility of carbon resulting from the presence of this element in human body, it appears to be a potential biomaterial. One of the applications of the carbon layers are coatings for medical implants. The studies of carbon films as coatings for implants in surgery were aimed on the investigations of biological resistance of implants, histopathological investigations on laboratory animals, tests of corrosion resistance measurements of mechanical properties and a breakdown test in Tyrod solution.
15
Content available Effect Of Cr and V Alloy Additions on the Microstructure and Mechanical Properties of Am60 Magnesium Alloy
63%
Rapiejko C. , Pacyniak T. , Pisarek B.
|
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.