Wyniki wyszukiwania - BazTech

1

Nowa seria certyfikowanych materiałów odniesienia aglorudy, grudek i koncentratów żelaza pochodzących z Ukrainy i Rosji

Spiewok W., Stankiewicz G., Smolec B., Kubiczek M., Porański P., Kuźmiński M., Drabik M.

Prace Instytutu Metalurgii Żelaza

|

2005

|

T. 57, nr 4

29-35

PL

Wyprodukowano czternastoczłonową serię certyfikowanych materiałów odniesienia surowców żelazonośnych. Przedstawiono metodykę poboru surowców na wzorce oraz technologię ich produkcji. Przeprowadzono badania jednorodności oraz międzynarodowe badania atestacyjne. W wyprodukowanych wzorcach atestowano zawartości Fe, FeO, SiO2, CaO, Mn, Al2O3, TiO2, MgO, C, P2O5, S, K2O, Na2O, Sn, V, Cr, Co, Ni, Cu, Zn, As, Pb, Ba i Cl.

EN

Fourteen-element batch of certified reference materials for iron-bearing stocks was manufactured. Methodology of selecting the stocks for standards and their manufacturing technology was presented. Homogeneity tests and international certification tests were carried out. The contents of Fe, FeO, SiO2, CaO, Mn, Al2O3 TiO2, MgO, C, P2O5, S, K2O, Na2O, Sn, V, Cr, Co, Ni, Cu, Zn, As, Pb, Ba and Cl in the manufactured standards were certified.

2

Influence of alternating circular magnetic field strength on magnetoimpedance of glass-coated micro-wire

Kuźmiński M., Lachowicz H. K., Garcia K. L., Zhukov A., Vazquez M.

Journal of Technical Physics

|

2005

|

Vol. 46, no 3

165-173

EN

The presented experiments on giant magnetoimpedance (GMI) effect were carried out using glass-coated amorphous micro-wire specimen of its diameter of 22.4 urn and nominal composition of Co67Fe3.85Ni1.45Mo1.7Si14.5B11.5. The main purpose of these experiments was to demonstrate the influence of the AC-current intensity flowing along this specimen and generating circular alternating magnetic field, on the properties of the GMI-effect. To demonstrate this, the GMI-ratio was measured vs. axial DC-field at various intensities of the AC-current ranging from 0.3 up to 5 mA, the range which corresponds to the intensity of the circular field of around 4.8 - 80 A/m at the surface of the micro-wire. The obtained dependences showed that the maximum of the GMI-ratio occurs at the intermediate intensity of the circular field, around 24 A/m (identified with the threshold field of the micro-wire specimen magnetized in the circumferential direction). This result was confirmed analyzing the dependences of the wire impedance plotted vs. the intensity of AC-current for different selected DC-field as a parameter. The results were interpreted considering the expected domain structure in the wire, in particular, that its surface layer was composed of the stripe domains magnetized circumferentially, alternately in opposite directions ("bamboo structure"). Such a structure is created by the magnetoelastic anisotropy. In order to make this explanation more reliable, the penetration depth of the skin-effect was calculated on the grounds of the classical model. Analysis of the AC-field dependence of the penetration depth additionally confirmed the presented interpretation. The main conclusion which can be drawn from the performed experiments is that, in order to achieve optimum parameters of the GMI from the view-point of application in sensors, AC-current intensity should appropriately be chosen.

3

Badania skutków oddziaływania udarowych zakłóceń elektromagnetycznych na wnętrzowe instalacje niskich napięć

Łoboda M., Flisowski Z., Kuźmiński M., Ślusarek S.

Zeszyty Naukowe. Elektryka / Politechnika Łódzka

|

2003

|

z. 100

97-106

PL

W referacie opisano metodykę badań eksperymentalnych napięć indukowanych przez udary piorunowe, generowane w warunkach laboratoryjnych, w instalacji niskiego napięcia zasilającej sieć komputerową w Zakładzie TWN Politechniki Warszawskiej. Przedstawiono wyniki pomiarów, dokonano analizy wartości oraz parametrów częstotliwościowych indukowanych napięć zakłóceniowych. Podjęto próbę oceny korelacji parametrów źródła zakłóceń (zaburzeń), którymi są udary piorunowe z efektem ich oddziaływania na rzeczywistą instalację zasilającą niskiego napięcia.

EN

The paper deals with the results of experimental investigations, performed in laboratory scale, and related to measurements of lightning induced voltages in the loop created by real low voltage power supply installation. The low voltage installation supplying the computer network was placed in proximity of app. 20 m from high voltage lightning impulse generator, which was the source of electrical discharges in long air gap and source of high surge current flowing during the breakdown in lm long air gap. The methodology of tests and description of high voltage arrangement, as well as layout of tested power supply network is described. Exemplary results of measured induced voltages are presented and discussed.

4

The effect of axial dc-field on transverse permeability in Co-based metallic glass ribbons

Lachowicz H. K., Kuźmiński M., Yu S. C.

Materials Science

|

2003

|

Vol. 21, No. 1

123-132

EN

A simple geometrical model is proposed. This model allows to calculate the penetration depth and the mean transverse permeability in magnetic elements of a rectangular cross-section which are used to study the giant magnetoimpedance effect (GMI). As an instance of the use of this model, both the mentioned quantities were calculated for the Co-based metallic glass ribbon using the experimental data obtained for the Co-based metallic glass ribbons. Their evolution with the applied axial dc-field at various frequencies of the ac-current, flowing along the ribbon, is presented. A comparison of the experimental data with those calculated by the model, shows that the latter gives only a qualitative approximation of the measured dependencies.

5

GMR-effect in granular Co-Cu structure at elevated temperatures

Kuźmiński M., Ślawska-Waniewska A., Lachowicz H. K., Kulik T.

Electron Technology

|

1999

|

Vol. 32, No. 4

338-342

EN

Transport and magnetic properties of the annealed melt-spun Cu₉₀Co₁₀ granular alloy were investigated at elevated temperatures. Complex intrinsie structure of the sample manifests itself in the observed giant magnetoresistance (GMR) characteristics. It is shown that the measured field and teperature dependencies of GMR are strongly influenced by the distribution of the size of superparamagnetic particles and by the presence of the residsual ferromagnetic phase ( much larger particles or agglomerations of smaller particles).

6

Kity dylatacyjne w posadzkach

Kuźmiński M.

Materiały Budowlane

|

1998

|

nr 9

61-61