Autor: Janik, B. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Zastosowanie stopów magnezu w lotnictwie
The usage of magnesium alloys in the aircraft industry
Autorzy:: Janik, B.
Powiązania:: https://bibliotekanauki.pl/articles/213255.pdf
Data publikacji:: 2011
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:: stopy magnezu w lotnictwie
zastosowanie
zapobieganie korozji
konstrukcje i materiały w lotnictwie
magnesium alloys in aircraft industry
usage
structures and materials in aerospace
Opis:: Stopy magnezu już od pierwszej połowy XX wieku zaczęły być stosowane w przemyśle lotniczym. Jednak wówczas borykano się z wieloma problemami, z których główne to zdolność do powstawania korozji oraz zagrożenie pożarem. Zatożeniem publikacji było sprawdzenie, czy stopy magnezu w dzisiejszych czasach sa już na tyle rozwinięte, by mogły z powodzeniem konkurować z innymi materiałami stosowanymi w lotnictwie. Analiza została przeprowadzona na podstawie wykonanych obliczeń, a także bazując na różnych źródłach opisanych w pracy. Część artykułu została poświęcona opisowi zastosowania stopów magnezu w dzisiejszym przemyśle, co może być dobrym wyznacznikiem ich przydatności.
Since the XX century magnesium alloys has been used in aerospace industry. However, at that time there were many serious problems, like corrosion and fire threat, that were difficult to solve and cope with. The main goal of this article was finding out, if magnesium alloys have changed and developed enough to be competitive to other materials used nowadays in the aerospace industry. Analysis was carried out basing on calculations and many other sources described in this article. Part of this work deals with description of usage of magnesium alloys in contemporary aerospace industry, which can prove its value and usefulness.
Źródło:: Prace Instytutu Lotnictwa; 2011, 12 (221); 102-108
0509-6669
2300-5408
Pojawia się w:: Prace Instytutu Lotnictwa
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Oznaczanie rtęci w moczu za pomocą kwasu 4-dwutiokarboksylowego antypiryny (4-DTA-H) oraz dwuetylodwutiokarbaminianu sodowego (Na-DDTK)
Opredelenie rtuti v moche s pomoshhju 4-dvutiokarboksilovojj kisloty antipirina (4-DTA-Kh) i dvukhehtilodvutiokarbaminiana natrija (Kha-DDTK)
Urine mercury assay with antipyrine 4-dithiocarboxylic acid (4-DTA-H) and sodium diethyldithiocarbamate (Na-DDTC)
Autorzy:: Janik, B.
Jankowski, J.
Sawicki, B.
Powiązania:: https://bibliotekanauki.pl/articles/2189710.pdf
Data publikacji:: 1971
Wydawca:: Polskie Towarzystwo Diagnostyki Laboratoryjnej
Tematy:: mocz
rtec
oznaczanie
metoda kolorymetryczna
kwas 4-dwutiokarboksylowy antypiryny
dwuetylodwutiokarbaminian sodowy
Źródło:: Diagnostyka Laboratoryjna; 1971, 07, 4; 419-422
0867-4043
Pojawia się w:: Diagnostyka Laboratoryjna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The pair-wise linear classifier and the k-NN rule in application to ALS progression differentiation
Autorzy:: Sokołowska, B.
Jóźwik, A.
Niebroj-Dobosz, I.
Janik, P.
Powiązania:: https://bibliotekanauki.pl/articles/333011.pdf
Data publikacji:: 2012
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:: rozpoznawanie wzorców
wybór funkcji
klasyfikator liniowy
zasada k-NN
biomarkery
stwardnienie zanikowe boczne
pattern recognition
feature selection
linear classifier
k-NN rule
pair-wise classifier
biomarkers
amyotrophic lateral sclerosis
Opis:: The two kinds of classifier based on the k-NN rule, the standard and the parallel version, were used for recognition of severity of ALS disease. In case of the second classifier version, feature selection was done separately for each pair of classes. The error rate, estimated by the leave one out method, was used as a criterion as for determination the optimum values of k's as well as for feature selection. All features selected in this manner were used in the standard and in the parallel classifier based on k-NN rule. Furthermore, only for the verification purpose, the linear classifier was applied. For this kind of classifier the error rates were calculated by use the training set also as a testing one. The linear classifier was trained by the error correction algorithm with a modified stop condition. The data set concerned with the healthy subjects and patients with amyotrophic lateral sclerosis (ALS). The set of several biomarkers such as erythropoietin, matrix metalloproteinases and their tissue inhibitors measured in serum and cerebrospinal fluid (CSF) were treated as features. It was shown that CSF biomarkers were very sensitive for the ALS progress.
Źródło:: Journal of Medical Informatics & Technologies; 2012, 20; 79-83
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Comparison of gate leakage current components in metal-insulator-semiconductor structures with high-k gate dielectris
Autorzy:: Janik, T.
Jakubowski, A.
Majkusiak, B.
Korwin-Pawłowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/308423.pdf
Data publikacji:: 2001
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: MIS structures
ultrathin dielectrics
high-k dielectrics
Opis:: Numerical simulations of the gate leakage current in metal-insulator-semiconductor (MIS) structures based on the transfer matrix approach were carried out. They show contribution of different components of this current in MIS structures with best known high-k dielectrics such as Ta2O5 and TiO2. The comparison of the gate leakage current in MIS structures with SiO2 layer as well Ta2O5 and TiO2 layers is presented as well. Additionally, the minimum Si electron affinity to a gate dielectric which allows to preserve given level of the gate leakage current is proposed.
Źródło:: Journal of Telecommunications and Information Technology; 2001, 1; 65-69
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Bulk Band Structure of CdTe along the Γ-L Direction
Autorzy:: Orłowski, B. A.
Janik, E.
Janowitz, C.
Manzke, R.
Powiązania:: https://bibliotekanauki.pl/articles/1886620.pdf
Data publikacji:: 1991-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 79.60.Eq
71.20.Fi
Opis:: The valence band structure E(k) for CdTe (111) Cd side surface 2 x 2 reconstructed was investigated along the Γ-L direction of the bulk Brillouin zone by high-resolution angle-resolved photoemission spectroscopy method in the energy range between 9.5 eV and 30.0 eV. The E(k) dependence was determined as well for bulk as for some of the surface states in the whole width of the valence band. Obtained results are compared with available calculated bulk band structure along Γ-L direction.
Źródło:: Acta Physica Polonica A; 1991, 79, 2-3; 303-306
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Analysis of matrix metalloproteinases (MMPs) in cerebrospinal fluid of patients with amyotrophic lateral sclerosis (ALS)
Autorzy:: Sokołowska, B.
Jóźwik, A.
Niebroj-Dobosz, I.
Janik, P.
Kwieciński, H.
Powiązania:: https://bibliotekanauki.pl/articles/333116.pdf
Data publikacji:: 2009
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:: klasyfikacja K-NN
stwardnienie zanikowe boczne
metaloproteinazy macierzy
płyn mózgowo-rdzeniowy
pattern recognition
k-NN classifier
amyotrophic lateral sclerosis
matrix metalloproteinase
cerebrospinal fluid
Opis:: Matrix metalloproteinases (MMPs) are implicated in the pathogenesis of motor neuron degeneration in amyotrophic lateral sclerosis (ALS) and might be potential markers of diagnosis, prognosis and monitoring treatment effects. The aim of the present study was evaluation of the MMPs significance in cerebrospinal fluid (CSF MMPs) of patients with ALS in relation to severity of the disease. Metalloproteinases MT-MMP-1, MMP-2, MMP-9 and additionally age of subjects and disease duration were analyzed. The results demonstrate that the error of differentiation between healthy subjects and ALS patients (for MMP-2 feature) as well as between mild and severe ALS states (for CSF MMPs set) equalled to 0.033. In conclusion, the pattern recognition approach may be useful for differentation of ALS progressing on the basis of CSF MMPs features.
Źródło:: Journal of Medical Informatics & Technologies; 2009, 13; 147-150
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Pattern recognition approach to differentiation of disease severity in patients with amyotrophic lateral sclerosis
Autorzy:: Jóźwik, A.
Sokołowska, B.
Niebroj-Dobosz, I.
Janik, P.
Kwieciński, H.
Powiązania:: https://bibliotekanauki.pl/articles/333433.pdf
Data publikacji:: 2008
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:: rozpoznawanie obrazu
klasyfikacja K-NN
erytropoetyna
pattern recognition
k-NN classifier
amyotropic lateral sclerosis
erythropoietin
Opis:: A possibility of recognition of the clinical status of patients with amyotrophic lateral sclerosis (ALS) in relation to severity of the disease was investigated. Three groups: (i) healthy controls (n=15) and two subgroups of ALS patients (ii) mild (n=15) and (iii) severe (n=15) were considered as classes. Four features of the subjects: (i) their age (AGE) (ii) erythropoietin concentration in serum (SERUM), (iii) in cerebrospinal fluid (CSF), and (iv) duration time of the disease (Tdis) were used for classifier construction based on the k Nearest Neighbours (k-NN) rule, known from pattern recognition theory. The presented results demonstrate that the pattern recognition approach may be useful for the evaluation of the severity of the ALS disease.
Źródło:: Journal of Medical Informatics & Technologies; 2008, 12; 143-147
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Magnetization of GaMnN Ceramics Prepared from Nanopowders by an Anaerobic Synthesis and High-Pressure High-Temperature Sintering
Autorzy:: Gosk, J.
Drygaś, M.
Janik, J.
Gierlotka, S.
Pałosz, B.
Twardowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/1398535.pdf
Data publikacji:: 2016-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Mm
81.07.Wx
81.07.-b
Opis:: Herein, we report a study on magnetic properties of GaMnN ceramics prepared by no additive high-pressure high-temperature sintering of a range of nanopowders, the latter made via an anaerobic synthesis method in the Ga/Mn bimetallic system at various nitridation temperatures and different levels of initial Mn concentration. Measurements of the magnetization as a function of temperature and magnetic field for the ceramics and parent nanopowders showed a typical paramagnetic behavior. Antiferromagnetic interactions between Mn-ions incorporated in the GaN lattice, GaMnN, were revealed and shown to be much stronger in the ceramics than in the respective nanopowders. In addition, in all of these materials an antiferromagnetic contribution originating from a residual Mn₂SiO₄ by-product was also observed. The highest calculated Mn concentration in the nanopowders reached 3.4 at.%. Complex mixtures of gallium nitride polytypes with multimodal particle size distributions in the nanosized range (small nano: 2-8 nm, large nano: 35-60 nm) were converted upon sintering to the single hexagonal GaN phase with average crystallite sizes of 40-80 nm and higher. For the optimal 700°C-treated materials, the Mn concentration in the parent GaMnN nanopowder was 3.2 at.% whereas in the derived ceramics it amounted to 5.5 at.%. At the same time, contributions of the adventitious Mn₂SiO₄ by-product significantly decreased upon sintering.
Źródło:: Acta Physica Polonica A; 2016, 129, 1a; A-103-A-106
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Valence Band Density of States and Mn 3d Contribution in Mn$\text{}_{1-x}$Mg$\text{}_{x}$Te
Autorzy:: Kowalski, B. J.
Guziewicz, E.
Kopalko, K.
Orłowski, B. A.
Janik, E.
Wojtowicz, T.
Johnson, R. L.
Powiązania:: https://bibliotekanauki.pl/articles/1991616.pdf
Data publikacji:: 1998-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.20.Nr
79.60.-i
Opis:: Resonant photoemission spectroscopy was applied to determine the Mn 3d derived contribution to the valence band density of states of Mn$\text{}_{0.44}$ Mg$\text{}_{0.56}$Te grown by molecular beam epitaxy on a GaAs(001) substrate. The modifications of the valence band density-of-states distribution are discussed as a consequence of the substitution of Mg ions for Mn ions.
Źródło:: Acta Physica Polonica A; 1998, 94, 3; 401-405
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: GaN Layers Grown by Reactive Ion Plating
Autorzy:: Żubka, A.
Dwiliński, R.
Suchanek, B.
Janik, W.
Wysmołek, A.
Kwiatkowski, S.
Kamińska, M.
Shaginyan, L.
Powiązania:: https://bibliotekanauki.pl/articles/1943889.pdf
Data publikacji:: 1995-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.15.Jj
68.55.Gi
Opis:: GaN layers grown on ceramics, sapphire or SiC substrates using reactive ion plating method are presented. In reactive ion plating method gallium from a hot source reacts on a heated substrate with nitrogen partially ionized. Rutherford backscattering technique was applied to check the composition of the samples and gallium to nitrogen ratio was found to be close to one. However, Rutherford backscattering studies showed also a remarkable amount of unintentional impurities present in the layers. The structure of GaN was determined using reflection high-energy electron diffraction. It appeared that polycrystal and monocrystal can be grown, depending on growth conditions. Absorption spectra taken on the layers grown on sapphire showed a tail of band to band absorption starting at about 370 nm. Carrier concentration was of the order of 1019-1020 cm$\text{}^{-3}$ at room temperature and did not change much with temperature decrease. No luminescence from the layers was detected, most probably due to high concentration of impurities.
Źródło:: Acta Physica Polonica A; 1995, 88, 5; 1058-1062
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Transmission SecondHarmonic Generation in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te at 1.064 µm
Autorzy:: Koziarska, B.
Kowalczyk, L.
Suchocki, A.
Wojtowicz, T.
Zakrzewski, A. K.
Karczewski, G.
Janik, E.
Kossut, J.
Powiązania:: https://bibliotekanauki.pl/articles/1873081.pdf
Data publikacji:: 1995-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 42.65.Ky
68.70.+w
Opis:: Second harmonic generation, created by nanosecond Nd : YAG laser pulses at 1.064 µm with relatively low intensity in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te bulk crystals and thin layers was measured in transmission geometry. The effect practically occurs in a very thin surface layer of the material and it is used as a relatively straightforward method of layer quality characterization. It is shown that the angular dependence of the second harmonic generation intensity in thin layers of CdTe with good crystallographic (and optical) quality agrees very well with the theory in contrary to the samples with some distortions from the ideal structure which exhibits large distortions from the theory.
Źródło:: Acta Physica Polonica A; 1995, 87, 2; 423-426
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Generation and Relaxation of Microstrains in GaN Nanocrystals under Extreme Pressures
Autorzy:: Grzanka, E.
Palosz, B.
Gierlotka, S.
Pielaszek, R.
Bismayer, U.
Janik, J.
Wells, J.
Palosz, F.
Porsch, F.
Powiązania:: https://bibliotekanauki.pl/articles/2035466.pdf
Data publikacji:: 2002-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.46.+w
81.07.Wx
Opis:: Nanocrystalline powders of GaN with grain sizes ranging from 2 to 30 nm were examined under high external pressures by in situ diffraction techniques in a diamond anvil cell at DESY (HASYLAB, Station F3). The experiments on densification of pure powders under high pressure were performed without a pressure medium. The mechanism of generation and relaxation of internal strains and their distribution in nanoparticles was deduced from the Bragg reflections recorded in situ under high pressures at room temperature. The microstrain was calculated from the full-width at half-maximum (FWHM) values of the Bragg lines. It was found that microstrains in GaN crystallites are generated and subsequently relaxed by two mechanisms: generation of stacking faults and change of the size and shape of the grains occurring under external stress.
Źródło:: Acta Physica Polonica A; 2002, 102, 2; 167-174
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Magnons in Cubic MBE-Grown A$\text{}_{1-x}$Mn$\text{}_{x}$Te Layers (A = Cd, Zn, Mg)
Autorzy:: Szuszkiewicz, W.
Hennion, B.
Jouanne, M.
Morhange, J. F.
Dynowska, E.
Janik, E.
Wojtowicz, T.
Zieliński, M.
Furdyna, J. K.
Powiązania:: https://bibliotekanauki.pl/articles/1992341.pdf
Data publikacji:: 1998-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.12.-q
75.50.Pp
78.30.-j
Opis:: One-magnon excitations in MBE-grown A$\text{}_{1-x}$Mn$\text{}_{x}$Te layers (where A = Cd, Zn, Mg and x>0.7) were investigated by means of the Raman scattering measurements at low temperatures (≈20 K). The composition dependence of the anisotropy energy - as extracted from these measurements - is discussed. Further, the elastic neutron scattering measurements were performed in layers of cubic MnTe, which constitute the end point material of the ternary alloys series. Abundance of variously oriented antiferromagnetic domains in MnTe layers as a function of temperature was studied. We confirm occurrence of a pronounced magnetostriction effect.
Źródło:: Acta Physica Polonica A; 1998, 94, 3; 583-587
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Dietary intake and adipose tissue level of specific fatty acids in a selected group from the Lower Silesia population
Autorzy:: Zatonska, K.
Campos, H.
Ilow, R.
Janik-Koncewicz, K.
Rozanska, D.
Regulska-Ilow, B.
Poltyn-Zaradna, K.
Szuba, A.
Zatonski, W.A.
Powiązania:: https://bibliotekanauki.pl/articles/51394.pdf
Data publikacji:: 2012
Wydawca:: Instytut Medycyny Wsi
Opis:: Purpose: The aim of the study was to assess the content of specific fatty acids in the diet and adipose tissue in a selected group of inhabitants of Lower Silesia in Poland. Methods: The study group consisted of 95 inhabitants of Wroclaw and surrounding villages (22 men and 23 women from the urban area, 23 men and 27 women from the rural area). Fatty acid content in subcutaneous fat samples was assessed by gas-chromatography. Dietary assessment was carried out using food frequency questionnaire. Dietary intake was analyzed using computer programme The Food Processor SQL 10.5.2 produced by ESHA Research USA, with a Polish database. Results: Mean daily energy and fatty acids intake was significantly higher among rural than urban inhabitants. Intake of alpha-linolenic acid (ALA), mainly from rapeseed oil, in urban inhabitants was 1.5 g/day in men and 1.6 g/day in women, and in rural inhabitants 2.6 g/day and 2.1 g/day, respectively. Dietary n-6 to n-3 ratio was higher among urban compared to rural inhabitants (6.7 vs. 5.5 among men and 6.4 vs. 5.5 among women, respectively). Content of ALA in adipose tissue was higher in rural women than in urban men (1.08% vs. 0.92% of total fat). Content of eicosapentaenoic acid (EPA) in adipose tissue in rural men (0.04% of total fat) and women (0.05% of total fat) was higher than in urban men (0.01% of total fat). The positive correlation (r=0.43) between the level of EPA in adipose tissue and percentage of energy from dietary EPA was observed among rural men. Overall, positive correlations were found between saturated (SFA) and polyunsaturated (PUFA) n-3 level in adipose tissue and percentage of energy from these fatty acids in a diet (r=0.20 and r=0.22, respectively). Conclusions: Mean daily n-3 fatty acid intake in urban inhabitants was lower than the recommended daily consumption in Poland. The positive correlation between fatty acids level in adipose tissue and dietary fatty acid intake was observed only for EPA among rural men, and in the all-study population for SFA and PUFA n-3. A high n-6 to n-3 ratio in the study group was observed.
Źródło:: Annals of Agricultural and Environmental Medicine; 2012, 19, 3
1232-1966
Pojawia się w:: Annals of Agricultural and Environmental Medicine
Dostawca treści:: Biblioteka Nauki