Wyniki wyszukiwania - BazTech

1

Wpływ strategii szlifowania kształtowo-podziałowego na dokładność i chropowatość uzębień kół zębatych

Zyzak P., Kobiela P., Brożek A., Gabryś M.

Mechanik

|

2018

|

R. 91, nr 8-9

737-740

PL

Przedstawiono wyniki badań wpływu przyjętej strategii szlifowania kształtowo-podziałowego uzębień kół zębatych walcowych na szlifierce Rapid Höfler 900 na klasę dokładności wykonania uzębienia oraz chropowatość powierzchni. Dokonano porównania otrzymanych rezultatów dla przyjętych strategii szlifowania. Strategie uwzględniały zmianę następujących parametrów determinujących uzyskiwane efekty szlifowania: liczbę przejść, liczbę skoków oraz sposób kształtowania profilu ściernicy.

EN

In the paper are presented investigation results of an effects of adopted strategy of profile-dividing grinding of a cylindrical gear teeth, performed on the Rapid Höfler 900 grinder, on machining accuracy and surface roughness of the teeth. The strategies have taken into considerations changes in the following parameters determining obtained results of the grinding: number of passes, number of leads, shaping method of the grinding wheel.

2

Diffuse phase transition of polycrystalline (Ba0.9Sr0.1)TiO3

Kajtoch C., Gabryś M., Bąk W., Starzyk F.

Materiały Ceramiczne

|

2010

|

T. 62, nr 3

400-402

PL

Przedstawiono wyniki pomiarów rentgenowskich (XRD) i dielektrycznych dla polikrystalicznego (Ba0,9Sr0,1)TiO3 (BS10T). Wyniki pomiarów pokazują obecność, w temperaturze 373 K, rozmytej przemiany fazowej (DPT) pomiędzy strukturą regularną i tetragonalną. Temperatura maksimum rzeczywistej składowej przenikalności elektrycznej (ε') nie zależy od częstotliwości elektrycznego pola pomiarowego. Kąt fazowy, Φ ≈-90°, między prądem a przyłożonym napięciem elektrycznym sugeruje występowanie obszarów polarnych (klasterów) poniżej 400 K, tj. w obszarze temperaturowym DPT i w fazie paraelektrycznej.

EN

The results of X-ray diffraction (XRD) and dielectric measurements performed for polycrystalline (Ba0.9Sr0.1)TiO3 (BS10T) are presented. Data from these measurements show a presence of diffuse phase transition (DPT) between cubic and tetragonal structure at a temperature of 373 K. The temperature Tm of the maximum of real part permittivity (ε') does not depend on the frequency of the applied electric field. A phase angle, Φ ≈ -90° between current and applied voltage, suggests an occurrence of polar regions (clusters) below 400 K i.e. in the DPT temperature range of and in the paraelectric phase.

3

Nowoczesne układy transportowe w kopalni "Budryk" z zastosowaniem lokomotyw spalinowych podwieszanych

Gabryś M.

Wiadomości Górnicze

|

2009

|

Vol. 60, nr 6

373-377

PL

Aby skrócić do minimum czas przezbrajania ścian, jak również wydłużyć czas pracy oddziałów wydobywczych, postanowiono radykalnie zmienić organizację przewozu ludzi i transportu materiałów oraz sprzętu do oddziałów w kopalni "Budryk". Zdecydowano się na wprowadzenie kolejek podwieszonych z napędem spalinowym. Pierwszy układ do transportu materiałów i przewozu ludzi kolejkami podwieszanymi z napędem spalinowym został wprowadzony w lipcu 2001 r. Obecnie transport kolejkami podwieszanymi z napędem ciągnikami spalinowymi prowadzony jest między poziomem 500 przez poziomy 700 i 900 do poziomu 1050, a długość tras wynosi około 50 km.

EN

In order to shorten to minimum the time of reequipping of longwalls and to lengthen the time of work of mining teams it has been decided to radically alter the organization and the transportation of materials as well as the equipment to sections of "Budryk" mine. It was decided to introduce suspended monorails with diesel drive units. The first arrangement for manridng and transportation of materials with suspended monorails driven by diesel engines was introduced in July 2001. At present transport with the use of suspended monorails driven by diesel engines is run between the horizons of 500 via the horizons of 700 and 900 to the horizon of 1050, and the length of the routs is about 50 km.

4

The dielectric behaviour of polycrystalline Ba0.96Na0.04Ti0.96Nb0.04O3 solid solution

Bąk W., Gabryś M., Kajtoch C., Tejchman W., Starzyk F.

Archives of Materials Science and Engineering

|

2009

|

Vol. 40, nr 1

13-16

EN

Purpose: The purpose of this work was to measure and investigate dielectric properties of new material, polycrystalline solid solution Ba0.96Na0.04Ti0.96Nb0.04O3 (BNTN4) within the temperature range 153 K-473 K. Design/methodology/approach: The dielectric spectroscopy method has been applied to measure dielectric and electric parameters within the frequencies from 20 Hz to 1 MHz. Findings: The dielectric permittivity (&epsilon') dependence on temperature (T) within the range of 473 K-225 K consist of two components: the reversly proportional one and the second one in the form of small local, transient peak at about 400 K. The global maximum is frequency dependent and above &sim 400 K along the T decrease, the dispersion of &epsilon' is initiated and low frequency dispersion of &epsilon' prevails below 250 K. Energy losses measure (&epsilon"), correlated with &epsilon'(T), is generally shifted towards lower T values. Its frequency dependence undergoes inversion which develops with T decrease and is initiated at about 370 K. The whole temperature induced phase transition turned out to be of relaxor kind and diffused process. The detailed analysis of this transition and its features was performed. Research limitations/implications: In order to determine the details of polycrystalline structure of BNTN4 new material for modelling of ferroelectric properties the precise X-ray diffraction measurements should be performed as function of T. The nature of ferroelectric - paraelectric (FE - PE) transition diffusive character will be studied by means of dielectric measurements within frequency range 1 MHz-1.8 GHz. Originality/value: The new kind of ferroelectric solid solution (BNTN4) was synthesized. The specific features of this material at low T range involves among others, the T-dependent dispersion of dielectric properties on low T side of broad &epsilon'(T) peak.

5

Diffused phase transition of polycrystalline (Ba0.80Sr0.20)TiO3

Kajtoch C., Bąk W., Gabryś M., Handke B., Starzyk F.

Archives of Materials Science and Engineering

|

2009

|

Vol. 39, nr 2

88-91

EN

Purpose: The purpose of this work was to determinate the influence of the 20% Sr substitutions (in sublattice A) on changes of the character of phase transition (PT) in comparison with pure barium titanate BaTiO3 (BT). Design/methodology/approach: Polycrystalline samples of (Ba0.80Sr0.20)TiO3 (BS20T) were prepared by calcinations method at temperature 1620 K. X-ray measurements were executed from 10 deg to 120 deg with the 0.008 deg step. Images of the morphology of the samples were taken by means of electron microscope Philips SEM 525M at room temperature. Dielectric measurements were performed with application of Quatro Cryosystem 4.0 Agilent Precision LRC meter HP4824A equipped with WinDETA 5.62 software Novocontrol. Measurements were taken under cooling with 2 K/min speed. Measuring electric field frequency was from the range 20 Hz - 1 MHz. Findings: The difference between the value of temperature of structural transition (cubic-tetragonal) equal 310K and the temperature Tm (the temperature of maximum of real part electric permittivity) equal 340 K was affirmed. It was affirmed, that 20% substitution of Sr ions changed the type of phase transition. The transition was strongly diffused (DPT). The polar character of this solid solution was also observed in a broad temperature range (in the paraelectric phase too). It is connected with the occurrence of polar regions (clusters). Research limitations/implications: The results can be used to describe changes of PT in the DPT solid solutions with ferroactive substitutions in sublattice A. Originality/value: Value of this work relies on the experimental examination of the dielectric properties of (Ba0.80Sr0.20)TiO3 (BS20T) solid solution. The temperature of the DPT was calculated. The low value of phase angle is connected with the existence of the polar regions.

6

Dielectric spectroscopy study of Ba0.98Na0.02Ti0.98Nb0.02O3 ceramic

Bąk W., Gabryś M., Kajtoch C., Stanuch K., Starzyk F.

Archives of Materials Science and Engineering

|

2009

|

Vol. 39, nr 2

107-110

EN

Purpose: The purpose of this work was to investigate dielectric properties of new ceramic solid solution Ba0.98Na0.02Ti0.98Nb0.02O3 (BNTN2) within the temperature range 153 K - 473 K. Design/methodology/approach: The dielectric spectroscopy method was applied to measure frequency and temperature dependence of complex dielectric permittivity, complex admittance, phase angle. The frequency dependence of ac conductivity at constant temperature was analysed as well as reciprocal permittivity and dielectric modulus as functions of temperature and frequency were compared. The Curie-Weiss rule and its generalized formula were applied in outcomes analysis. Findings: The ferroelectric - paraelectric (FE - PE) phase transition occurring in BNTN2 was found as having diffusive nature. In the paraelectric phase at about 400 K the diffusivity of transition step is correlated with the same kind of transition in BaTiO3 (BT) (transition of FE - PE type) and with structural transition occurring in NaNbO3 (NN). Within the temperature range below Tm = 308 K, dependences of dielectric properties of BNTN2 ceramic on temperature and frequency was found as having relaxor type of behaviour. Research limitations/implications: The confirmations of achieved findings will be possible by more precise BNTN2 structure determination by means X-ray diffraction. Also closer explanation of FE - PE phase transition can be performed by dielectric measurements within broader frequency range up to 1.8 GHz ( diffusive versus relaxor character of transition). Originality/value: The new solid solution of BNTN2 was prepared. The structure of this material was characterized as dielectrically active and having FE - PE phase transition which was described.

7

Dielectric properties of polycrystalline (Ba0.40Sr0.60)O3

Kajtoch C., Bąk W., Gabryś M., Mroczka K., Starzyk F., Żmija J.

Archives of Materials Science and Engineering

|

2009

|

Vol. 40, nr 1

33-36

EN

Purpose: Purpose of this paper is to qualify of the degree and the causes of broadening of the phase transition in the polycrystalline solid solution (Ba0.40Sr0.60)TiO3 (BS60T). Design/methodology/approach: Polycrystalline samples of (Ba0.40Sr0.60)TiO3 (BS60T) were prepared by calcinations method at temperature 1570K. Images of the morphology of the samples were taken by means of electron microscope Philips SEM 525M at room temperature. Dielectric measurements were performed with application of Quatro Cryosystem 4.0 Agilent Precision LRC meter HP4824A equipped with WinDETA 5.62 software Novocontrol. Measurements were taken under cooling with 2K/min speed. Measuring electric field frequency was from the range 20 Hz - 1 MHz. Findings: The dielectrometry was applied to measure complex dielectric permittivity and other dielectric functions of ferroelectric (BS60T). It was affirmed, that 60% substitution of Sr ions changed the type of phase transition. Weak dependence of temperature Tm=208 K (temperature of maximum electric permittivity &epsilon') on frequency of the external electric field testifies about diffused character of the phase transition (DPT). The polar character of this material was also observed in the paraelectric phase (to 360 K). This observation is connected with the occurrence of polar clusters in this phase. Research limitations/implications: Results can be used in order to describe the phase transition modifications in the solid solutions with ferroactive substitutions in sublattice B of the perovskite. Originality/value: Value of this work relies on the experimental examination of the electric properties of BS60T solid solution. The low value of phase angle in the paraelectric phase is connected with the occurrence of the polar regions (clusters).

8

Study of phase transition specific in polycrystalline Pb(Cd1/3Nb2/3)O3

Kajtoch C., Bąk W., Starzyk F., Gabryś M.

Archives of Materials Science and Engineering

|

2008

|

Vol. 29, nr 1

20-23

EN

Purpose: of this paper was to isolate and attempt to identify experimentally specific features of paraelectric diffused phase of Pb(Cd1/3Nb2/3)O3 (PCN) not reported yet in the literature. Design/methodology/approach: we used was to measure and analyse the temperature and frequency dependence of polarization, energy loss, phase angle and ac-conductivity components. Findings: we have isolated four specific processes visible as specific behaviour of ĺ’(T, í); on ĺ” and phase angle also temperature and frequency dependences and three contributions to ac-conductivity. Practical implications: processes isolated will be used to construct a model of polarizability and energy loss as well as ac-conductivity in diffused paraelectric phase of PCN. Originality/value: of the paper rely on the possibility of experimental verification of temperature induced evolution of polar regions structure and dynamics created in high temperature region of paraelectric phase of PCN.

9

Structural and dielectric properties of polycrystalline (Ba0.9Sr0.1)TiO3

Kajtoch C., Gabryś M., Tejchman W., Handke B.

Archives of Materials Science and Engineering

|

2008

|

Vol. 33, nr 2

89-92

EN

Purpose: This work is aimed to determination of the influence of Sr - ferroactive substitution on physical properties and character of phase transitions (PT) in barium titanate BaTiO3 (BT). Design/methodology/approach: Polycrystalline samples of BST-10 were prepared by means of calcination method at the 1600 K. Roentgenogram of BST-10 was made within the angles from 10 deg to 110 deg with the 0.008 deg step. Images of the morphology of the samples were taken by means of electron microscope Philips SEM 525M at room temperature. Dielectric measurements were performed with application of Quatro Cryosystem 4.0 and Agilent Precision LCR meter HP4284A equipped with WinDETA 5.62 software Novocontrol. Measurement were taken under cooling with 2 K/min speed. Measuring electric field frequency was from the range 20 Hz-1 MHz. Findings: Dielectric spectroscopy in the frequency domain was applied to measure complex dielectric permittivity and other dielectric functions of ferroelectric polycrystalline (Ba0.9Sr0.1)TiO3 (BST-10). It was established that 10% substitution of Sr in BST-10 solid solution did not change the character of the phase transitions. The temperatures of the phase transitions were correlated with low temperature of PT in SrTiO3 (ST). Similar properties of Ba and Sr ions were taken into consideration. The dipolar character of solid solution was also observed in paraelectric phase. Practical implications: Obtained results can be used to model the effects of ferroactive and nonferroactive substitutions in the A and B subnets of perovskite ferroelectrics. Originality/value: An attempt to correlate low phase angle values observed in the paraelectric phase of BTS-10 with high dielectric permittivity and the occurrence of polar regions.

10

Influence of electric field DC-component on AC-response of ferroelectric powder

Starzyk F., Bąk W., Kajtoch C., Gabryś M.

Archives of Materials Science and Engineering

|

2008

|

Vol. 29, nr 1

36-39

EN

Purpose: of this work was to establish whether ac-response of freely stocked micro-granular ferroelectric matter on fringe measuring electric field depends on constant component presence VDC (or DC-Bias). Design/methodology/approach: used involves measurements of effective dielectric permittivity (and other effective dielectric quantities) by means of interdigit dielectrometry. Fringe measuring electric field was applied to BaTiO3 micro-powder by interdigit comb sensor (ICS) Netzsch of Ms25 type. ICS was driven by measuring generator with sinusoidal voltage: v(t)= VDC+VACsin(�ωt), within frequency range 20Hz-100kHz and for DC-Bias values ranging as VDC=(0-20)V. Findings: The interdigit dielectrometry was applied to measure complex dielectric permittivity, complex dielectric modulus and others dielectric functions of ferroelectric BaTiO3 powder. The influence of constant component of electric stimulus was investigated in the frequency range 100 kHz to 20 Hz. It was established that in the low frequency range constant component of electric field enhances effective dielectric permittivity, and changes two weak relaxation processes occurring in the ferroelectric micro-granular net. It turned out that effective dielectric complex modulus of this net is most sensitive quantity for application of constant component of electric stimulus. Research limitations/implications: The density solution effect is a source of small effective dielectric permittivity of micro-granular ferroelectric powder (�ε'). �Epsilon' values are being enhanced by presence of non zero VDC value. The same effect was established for effective energy loss coefficient (�ε"). The two relaxational processes connected with VDC�𕟀 seems to be a key feature of freely stocked ferroelectric matter. Originality/value: of this work relays on the fact, that this is a first report of the VDC influence on effective dielectric properties of ferroelectric micro-granular matter. It is opening the way to a new approach in modelling of effective dielectric properties of granular matter in nature and powders technology.

11

Dielectric properties of polycrystalline (Ba0.60Sr).40)Ti0.8O3

Gabryś M.

Archives of Materials Science and Engineering

|

2008

|

Vol. 34, nr 1

27-30

EN

Purpose: The purpose of the work was to determinate the influence of the ferroactive Sr substitutions in sublattice A and the nonstoichiometry in sublattice B on changes of physical properties and the character of phase transition (PT) in pure barium titanate BaTiO3 (BT). Design/methodology/approach: The polycrystalline samples of (Ba0.60Sr0.40)TiO3 and (Ba0.60Sr0.40)Ti0.8O3 were obtained by the calcinations method in temperature 1620 K. The dielectric measurements were executed by automatic device (QUATRO KRIO 4.0 with LCR Agilent 4824A meter and BDS 1100 cryostat). The materials were investigated under cooling conditions with speed of 2 K/min and within frequency range from 20 Hz to 1 MHz. Findings: The dielectrometry was applied to measure complex dielectric permittivity and other dielectric functions of ferroelectric (Ba0.60Sr0.40)TiO3 (BST-40) and (Ba0.60Sr0.40)Ti0.8O3 (BST-40/0.8). It was affirmed, that 40% substitution of Sr ions as well as 20% deficiency of Ti ions in solid solution reduced temperature and changed the type of phase transformation. The transformation stood strongly diffused. The weak dependence of temperature Tm (peak of electric permittivity ε') from frequency of electric measuring field was observed. It means, that this material should be prescribed to the class of ferroelectrics with diffused phase transformation (DPT). The polar character of this solution was also observed in the paraelectric phase. It is connected with the occurrence of polar clusters in paraelectric phase. Practical implications: Results can be used to construct the model describing changes in the solid solutions with ferroactive and nonferroactive substitutions in sublattice A or B of the perovskite. Originality/value: Value of this work relies on the experimental examination of the electric properties of nonstoichiometric BST-40 solid solution. The low value of phase angle in the paraelectric phase was connected with the occurrence of the polar regions.

12

Miejscowe zastosowanie kwasu aminolewulinowego w leczeniu nienowotworowych schorzeń sromu metodą terapii fotodynamicznej

Pałczyński B., Ekonjo G., Gryboś M., Gabryś M., Ziółkowski P., Sozański R.

Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna

|

2002

|

Vol. 8, nr 3

111-113

PL

Przedstawiono wyniki miejscowego zastosowania kwasu aminolewulinowego w leczeniu nienowotworowych schorzeń sromu stosując terapię fotodynamiczną(PDT). Leczeniu poddano 6 pacjentek, u których w badaniu histopatologicznym rozpoznawano liszaj twardzinowy (3 przypadki) i leukoplakię (3 przypadki). W wyniku terapii foto-dynamicznej uzyskano poprawę stanu miejscowego oraz zmniejszenie dolegliwości - nieznaczne u 1 pacjentki, wyraźne u 3 pacjentek, 2 pacjentki stwierdzały całkowite ustąpienie świądu i pieczenia sromu po 3 miesiącach od ostatniego zabiegu PDT.

EN

We have presented the results of the local application of aminolevulinic acid in the treatment of non-neoplasmatic vulvae lesions with the help of photodynamic therapy (PDT). Six patients who were diagnosed for lichen sclerosus (3) and leukoplakia (3) underwent this therapy. A correction of local lesions was achieved as well as reduction in the reported symptoms- partial regression in 1 patient, evident regression in 3 patients and in 2 patients complete regression of the symptoms were reported a 3 months after the last PDT.

13

Miejscowe zastosowanie kwasu aminolewulinowego w leczeniu dysplazji szyjki macicy metodą terapii fotodynamicznej

Pałczyński B., Ekonjo G., Gryboś M., Gabryś M., Ziółkowski P., Dulny P.

Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna

|

2002

|

Vol. 8, nr 3

115-117

PL

W pracy przedstawiono wyniki miejscowego zastosowania kwasu aminolewulinowego w leczeniu dysplazji szyjki macicy za pomocą terapii fotodynamicznej. Leczeniu poddano 19 pacjentek. W wyniku terapii fotodynamicznej uzyskano zanik zmian nabłonkowych u 12 pacjentek, u pozostałych 7 brak danych o wynikach leczenia.

EN

We have presented the results of the local application of aminolevulinic acid in the treatment of dysplasia colli uteri by means of photodynamic therapy (PDT). The 19 patients were treated. A complete regression of epithelial lesions was achieved in 12 cases. There is no data available about the results of treatment of the remaining 7 patients.