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    Wyświetlanie 1-39 z 39
    Tytuł:
    Występowanie substancji chloroorganicznych w wodzie po procesie utleniania oraz możliwości ich analizy
    Occurence of chlororganic substances in water after oxidation and their analysis capabilities
    Autorzy:
    Schmidt, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819768.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    substancje chloroorganiczne
    woda
    tlen
    utlenianie
    chlororganic substances
    water
    oxidation
    Opis:
    Chromatographic analysis GC makes several problems during optimisation and separation of analysed substances. Programming of temperature increase,temperature of feeder and temperature of detector are the most common problems. Than it is neccesary to take into consideration other factors, which will have significant impact on retention time, selectivity of separation of analysed compounds or retention index. The chosen results of the research into the influence of various oxidants on forms and quantity of the occurrence of THM, MX-THAT and the Purgeable Halogenoacetic acids in drinking water have been presented in this paper. As a result of conducted research the influence of chemical composition of water, a dose and a sort of applied oxidant on the quantity of the formed chlororganic substances has been shown. It also has been shown that these substances are also formed as a result of oxidation with compounds not containing chlorine.According to the form of the occurring chlororganic compounds and their concentrationafter hydrogen dioxide oxidation, various toxic compounds are possible to beformed. They are cancerogenic and mutagenic ones. The concentration of by-products of oxidation depends on the presence anda sort of precursors, a sort of disinfectant, temperature, season, time of contact and reactionof solution. The kinds and quantity of oxidation by-products also depend on a kindof oxidant and the concentration of the catalyst. Such catalysts in natural waters areinorganic compounds. The capabilities of their quantification using gas chromatographyhave also been presented.Analysis of real samples showed high repeatability and accuracy of conducteddeterminations. Such analysis required accurate sample purification and comparison ofthree extractants because of high concentration of high molecular substances (fulvic acids).
    Źródło:
    Rocznik Ochrona Środowiska; 2009, Tom 11; 837-848
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Walidacja metod analitycznych chemicznych i mikrobiologicznych
    Validation of chemical and microbiological analytic methods
    Autorzy:
    Schmidt, R.
    Michna, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1826088.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    analiza chemiczna
    zanieczyszczenie środowiska
    walidacja
    pomiary analityczne
    Opis:
    Jednym z podstawowych kierunków rozwojowych analityki i monitoringu zanieczyszczeń środowiska jest dążenie do oznaczania coraz mniejszych stężeń składnika w próbkach o złożonej matrycy. Tego typu zadanie jest wielkim wyzwaniem dla analityków i wymaga zwrócenia uwagi na kontrolę i zapewnienie jakości wyników badań [4÷6, 17, 19, 20]. Dokładność oznaczeń można osiągnąć stosując proces walidacji metody analitycznej z różnymi matrycami [3, 7, 22, 23, 28]. Walidacja metody jest procesem ustalenia czy charakterystyki techniczne metody analitycznej są odpowiednie do zamierzonego celu. Dla uzyskania najbardziej wiarygodnych wyników należy przeanalizować metodykę badawczą, w tym procedurę przygotowywania i pobierania próbek. Ważność metody można zweryfikować tylko poprzez badania międzylaboratoryjne [5, 11, 13, 14, 18, 29, 30, 37]. W skład procedury oszacowania jakości wchodzą zazwyczaj następujące elementy: kontrola i ocena dokładności uzyskiwanych wyników poprzez okresowe analizowanie próbek kontrolnych, ocena dokładności metody poprzez: analizę próbek certyfikowanych materiałów odniesienia, porównanie uzyskanych wyników z wynikami uzyskanymi dla tej samej próbki przy zastosowaniu metody odniesienia, wykonanie analiz próbek po dodaniu do nich wzorca, przeprowadzenie porównawczych badań miedzylaboratoryjnych, stosowanie kart kontrolnych, stosowanie odpowiedniego systemu rewizji (auditingu). Ponieważ brak jest dokładnej metodyki przeprowadzenia procesu walidacji metody badawczej dlatego celem pracy jest przedstawienie możliwości przeprowadzenia walidacji z zastosowaniem zarówno metod chemicznych jak i mikrobiologicznych.
    One of the basic developmental directions of the environment pollution analytics and monitoring is aspiration to determination more and more small concentrations of components in samples with complex matrix. This type of problem is great challenge for analysts and requires turning attention to control and assurance of the quality of investigations results. Accuracy of analysis may be reached by applying process of the validation of the analytic method with various matrices. Validation of method is the process of settlement if technical profile of analytic methods are suitable for the intended aim. In order to obtain the most reliable results research methodology, including procedure of preparing and taking the samples, should be analysed. Validity of method may be verified only by interlaboratory investigations. Procedure of quality estimation usually consists of following elements: o control and evaluation of gained results accuracy by periodical analysing of control samples, o evaluation of method accuracy by: analysis of samples of certified reference materials, comparison of gained results with results obtained for the same sample using reference method, analyse of samples after addition of standard, execution of comparative interlaboratory analyses, application of supervisory cards, application of suitable system of inspection (auditing). Three parameters are inseparably connected with validation of analytic method: o limit of detection (LOD), recommended bottom level of this parameter value is triple value of standard deviation for given method, o reliable detection limit (RDL) - its value should be at least six-time value of standard deviation, o limit of quantitation (LOQ) that is value recognized as the smallest reliable (on the level of probability at least 99%) result of determination using given method. Its value should be between 9 and 10s (s - standard deviation). Validation of chemical and microbiological methods includes testing essential characteristic features of the method. Laboratory, in order to fulfil suitable criteria, should set up, apply, keep and develop quality system, proper for the range of its activity with regard to all undertaken activities and kinds of investigations. Quality system in the laboratory should be suitable for kind and quantity of executed investigations. During samples analysis data should be validated. This process includes both documentation and control of inviolability and idnetifibility of data.
    Źródło:
    Rocznik Ochrona Środowiska; 2007, Tom 9; 239-257
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    200 years of land - use change and gully erosion : a case study from Małopolska, SE Poland
    Autorzy:
    Schmidt, R.
    Heinrich, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/295154.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    gully erosion
    human impact
    land-use change
    Małopolska
    Polska
    Opis:
    Loess areas are highly affected by human impact since the Neolithic revolution. Within the study in Małopolska we assess the impact of land-use changes on geomorphological processes for the last 200 years. Phases of deforestation and a subsequent intensive agricultural use can be correlated with the appearance of gully erosion.
    Źródło:
    Landform Analysis; 2011, 17; 167-171
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ modyfikacji zeolitów na ich właściwości fizykochemiczne
    Impact of zeolites modification on their physicochemical properties
    Autorzy:
    Świderska-Dąbrowska, R.
    Schmidt, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819297.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    ion exchange
    natural clinoptilolite
    removal
    cations
    metals
    Cr3+
    cu2+
    pb2+
    Fe3+
    Opis:
    Zeolites are crystalline, hydrated aluminosilicates of alkali and alkaline earth metals (Na, K, Mg, Ca, Sr, Ba), in which the pore size is 0.3-1.2 nm and depends on the structure of the zeolite. They consist of tetrahedrons of [AlO4]-5- and [SiO4]4-, which make ordered crystal lattice of rings, channels and chambers. Variable degree of oxidation of silicon (IV) and aluminum (III) causes their electronegative character. The size of the charge may determine the adsorption, ion exchange and catalytic capacities of zeolite. The structure made of ring tetrahedron units contains open tunnels, making zeolites also molecular sieves. Zeolites are mostly used for adsorption of ammonium ions from aqueous solutions, removal of radioactive elements and heavy metals, and recent studies suggest the possibility of application of zeolites for removal of chloroorganic compounds and oily pollutants. The most widely used zeolite in practice for water and wastewater treatment is clinoptilolite, which is characterized by large ion exchange and adsorption capacity. Authors of many works explain the adsorption process with ion exchange. But when interpreting the results the authors do not consider that the zeolites have also tunnels that make them also molecular sieves. As a result of ion adsorption on clinoptilolite in hydrogen or sodium form, pH of the solution decreases, resulting in possible formation of electropositive, electronegative complexes and dissociated ions which make up aquaions, increasing or decreasing the effectiveness of their removal. During usage of modified zeolites for the adsorption of ions from aqueous solutions, many accompanying processes take place, such as precipitation, coprecipitation and catalytic adsorption. The influence of the physicochemical properties of natural zeolite and zeolite in the hydrogen form on an aqueous solution in the process of washing out is presented in the paper. Presented results clear prove that the decisive factor affecting the quality of the aqueous solution after the washing out process is initial pH of the solution. Depending on method of modification, physicochemical properties of zeolites can vary considerably. Transformation of natural zeolite into the hydrogen form increases its acidity and physical and chemical resistance. Modification of zeolite with HCl may also increase the content of pure zeolite by dissolution of other, non-zeolite materials. Zeolite H has a greater content of of silicon and aluminum compounds in relation to total mass which is a result of introduction of protons into the zeolite. This is confirmed by lower content of alkali metals and alkaline earth metals (sodium, calcium and potassium) in ZH. Exchange of ions of sodium, potassium, calcium for protons is a result of modification of ZN with HCl. Examination of washing out process showed that there is a small migration of impurities (Fe and Ca) from ZH as compared to ZN. At the same time increase of iron content in the solution increases its turbidity. And also turbidity depends on the initial pH of the solution. It's highest value was observed when the initial pH was equal to 6. Significant increase of turbidity as a function of pH is mainly caused by abrasion of zeolite grains in the process of shaking and by formation of precipitable complexes of iron and calcium. The paper presents also the results of zeta potential measurements. potential of H zeolite in the investigated range of pH has a much higher absolute values compared to ZN and vary in the range from -20 mV to -30 mV. H zeolite has a higher electrostatic activity than natural zeolite. Potential creating ions such as H+ and OH- have decisive influence on the zeolite surface charge.
    Źródło:
    Rocznik Ochrona Środowiska; 2012, Tom 14; 460-470
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Sedimentation Supported by Coagulation Process on Effectiveness of Separation of the Solid Phase from Wastewater Stream
    Autorzy:
    Maciołek, P.
    Szymański, K.
    Schmidt, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/123962.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    wastewater treatment
    coagulation
    flocculation
    separation
    Opis:
    The objective of this work was to test the impact of coagulant and flocculant at the stage of mechanical wastewater treatment on the wastewater treatment plant operation, performed in the A2O process. In this paper, the principles of correct conduct of coagulation in wastewater treatment have been discussed. It appears from the research performed that significant elimination of BOD5 such as 20÷30%, total suspended matter up to 90%, COD up to 50% and total nitrogen at 30% level was achieved supported by the coagulation process in the pre-settling tanks. Approximately 50% of phosphorus was eliminated after the mechanical part. Additionally, a significant impact of Superfloc flocculant on the effectiveness of the solid phase separation (activated sludge) in the secondary settling tank was noted under diversified flow conditions.
    Źródło:
    Journal of Ecological Engineering; 2018, 19, 6; 81-87
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości fizykochemiczne zeolitu modyfikowanego jonami żelaza
    Physicochemical properties of modified with iron ions zeolite
    Autorzy:
    Świderska-Dąbrowska, R.
    Schmidt, R.
    Sikora, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/400983.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    katalizator heterogeniczny
    naturalne zeolity
    modyfikacja zeolitów
    potencjał elektrokinetyczny
    rozmywalność
    heterogeneous catalyst
    natural zeolites
    zeolites modification
    elektrokinetic potential
    elution test
    Opis:
    W dobie wzrastającego zanieczyszczenia środowiska naturalnego istotne jest poszu-kiwanie coraz efektywniejszych metod ich usuwania. W szczególności zastosowanie tanich i łatwo dostępnych katalizatorów "proekologicznych" - naturalnych zeolitów, pozwala na intensyfikację wielu procesów, a ponadto nie są wnoszone do środowiska dodatkowe zanieczyszczenia. Szerokie zastosowanie naturalnych zeolitów - uwodnionych glinokrzemianów, wynika z ich wyjątkowej struktury przestrzennej, nadającej im właściwości molekularno-sitowe, jonowymienne i sorpcyjne oraz dużą aktywność katalityczną. Ich powierzchnię można łatwo modyfikować jonami metali. Stąd mogą one być z powodzeniem stosowane jako heterogeniczny katalizator w procesie Fentona, do utleniania zanieczyszczeń organicznych w wodzie i ściekach. W pracy opisano właściwości fizykochemiczne zeolitu naturalnego modyfikowanego jonami żelaza (II), który następnie poddano prażeniu w temperaturze 450°C. W wyniku modyfikacji ziarna zeolitu pokryte zostały czerwonobrunatnymi tlenkami żelaza (III), które stanowiły ok. 5% masy zeolitu. Powstała powłoka była stabilna mechanicznie i chemicznie - do roztworu przechodziły niewielkie ilości Fe, nie przekraczające 70 /
    Currently, when the pollution of natural environment increases, the search for more effective methods of pollutant removal is essential. Application of cheap and easy to get pro-ecological catalysts - natural zeolites - allows to intensify many processes. These minerals do not bring any additional pollutant to the environment. Wide application of natural zeolites, the hydrated alumino-silicates results from their unique spatial structure. Such structure of zeolites gives them molecular sieve properties, ionic exchange and sorption properties, and high catalytic activity. The surface of zeolites can be easily modified with metal ions, therefore they can be used as heterogeneous catalyst in the Fenton process. In this paper physicochemical properties of natural zeolites modified with Fe(II) ions, calcinated at 450°C are presented. As a result of modification, zeolite grains were covered by red-seal iron (III) oxides, which were about 5% of zeolite mass. Coating was mechanically and chemically stable -from zeolite to solution leached only small amounts of Fe, not exceeding 70 /
    Źródło:
    Inżynieria Ekologiczna; 2011, 24; 195-204
    2081-139X
    2392-0629
    Pojawia się w:
    Inżynieria Ekologiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation of continuum damage in elasto- viscoplastic constitutive equations
    Autorzy:
    Ambroziak, A.
    Kłosowski, P.
    Nowicki, M.
    Schmidt, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955210.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska
    Tematy:
    elasto-viscoplastic constitutive models
    damage
    finite element method
    Opis:
    Modelling of the continuum damage framework, is developed for application in the elasto-viscoplastic Chaboche constitutive model. A brief description of the basic variant of the Chaboche model equations is given, followed by a discussion of the most important assumptions necessary to obtain evolution of the continuum damage model and its appli-cation to the open FE commercial program. A consistent presentation of the two proposed approaches is followed by numerical examples.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 2; 207-220
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biofilter model development for the removal of pollutants from feedlot runoff
    Autorzy:
    Wan, H.
    Wilson, B. N.
    Schmidt, D. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/207193.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biofilters
    parameter estimation
    pollution
    runoff
    biofiltr
    usuwanie zanieczyszczeń
    MinnFARM
    Opis:
    Biofilters are a potential treatment option for removing pollutants from feedlot runoff but little research has been done on their use and design. In this study, two mechanism -based models were developed to simulate biofilter processes: a first-order model and a logistic model. The two models were calibrated and evaluated using nitrogen (N) and phosphorus (P) data collected from rainfall events for an experimental biofilter at Melrose, Minnesota, USA. The first-order model predicted removal efficiencies better than the logistic model. The sensitivity analysis suggested that the predictions of the first-order model are more sensitive to parameter. In addition, the uncertainty analysis suggested that the range in predictive errors could be a consequence of uncertainty of estimating parameter from the limited data set for the first-order model. In contrast, the uncertainty analysis for the logistic model of N suggested that reasons other than the uncertainty in parameter estimation are needed to explain predictive errors. Overall, the study provides a useful tool for assessing biofilter performance that can easily be improved with larger observed data sets. The biofilter model has been implemented in the most recent version of the Minnesota feedlot annualized runoff model (MinnFARM).
    Źródło:
    Environment Protection Engineering; 2017, 43, 3; 61-80
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fossil thrips of the family Uzelothripidae suggest 53 million years of morphological and ecological stability
    Autorzy:
    Nel, P.
    Schmidt, A.R.
    Bassler, C.
    Nel, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/22508.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    fossil
    thrip
    morphological stability
    ecological stability
    Arthropoda
    Thysanoptera
    Uzelothripidae
    fungi
    Ascomycota
    Capnodiales
    sooty mould
    amber
    Eocene
    France
    Opis:
    The new fossil thrips Uzelothrips eocenicus P. Nel and A. Nel sp. nov. (Thysanoptera: Uzelothripidae) is described from two lowermost Eocene amber−preserved specimens (one macropterous and one apterous). The family Uzelothripidae is only known so far from a single extant species, Uzelothrips scabrosus. The fossils differ from the extant species only by the antennal segments III and IV, which appear distinctly separated instead of being fused as in the in the extant U. scabrosus. Dark−coloured hyphae and conidia of the Dothideomycetes (Ascomycota) which are likely to belong to the sooty moulds (Capnodiales) are attached to the apterous fossil specimen. We consider this arthropod−fungus association not to be accidental since these fungi are also found in extant specimens of these uzelothripids, suggesting very specific long−term interactions and strong habitat specificity.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Upper Sinemurian ammonite succession in the Sierra Madre Oriental (Mexico)
    Autorzy:
    Meister, Ch.
    Blau, J.
    Dommergues, J-L.
    Schlatter, R.
    Schmidt-Effing, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061407.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ammonites
    Early Jurassic
    Sinemurian
    biostratigraphy
    Mexico
    Sierra Madre Oriental
    Opis:
    In the Sierra Madre Oriental (Mexico), the biostratigraphic subdivision of the Upper Sinemurian can be refined. It has been possible to differentiate 11 horizons from the upper Obtusum Zone to the top of the Raricostatum Zone which are correlated with the NW European standard zonation. The index species of each horizon is figured.
    Źródło:
    Volumina Jurassica; 2009, 7, 1; 31-36
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of parametric methods of power spectrum estimation in passive sonar signals classification
    Autorzy:
    Schmidt, J.
    Salamon, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/332824.pdf
    Data publikacji:
    1999
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper presents the signals classification method based on the parametric spectral analysis as applied to the passive sonar. The system's structure is discussed special emphasis is given to the procedure of features selection in which true poles are chosen. Attached are results of tests carried out to evaluate the applicability of parametric methods of spectral estimation for the purpose of creating acoustic portraits and their classification.
    Źródło:
    Hydroacoustics; 1999, 2; 145-150
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Code signals transmission using MFSK modulation in shallow waters
    Autorzy:
    Zachariasz, K.
    Schmidt, J.
    Salamon, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/332705.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper presents an acoustic system for the transmission of digital data in shallow coastal waters of which multi-path propagation and intense reverberations are characteristic. To ensure a small error probability of moderate speed transmission, the system uses corrective codes and a technique of incoherent modulation MFSK (Mufti Frequency Shift Keying). To synthesise the transmission signal, estimate the spectrum of the signal received and code and decode the channels, a DSP processor was used. The paper includes the results of a computer simulation in which the system was put to work in the presence of Gaussian noise. The system was tested in shallow coastal waters and the results are discussed in the paper.
    Źródło:
    Hydroacoustics; 2001, 4; 261-264
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Density of States in Thin Boron-Doped Microcrystalline Silicon Films Estimated from the Thermally Stimulated Conductivity Method
    Autorzy:
    Dussan, A.
    Schmidt, J.
    Koropecki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1207505.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    73.61.Ga
    61.72.uf
    Opis:
    In this work, a series of boron-doped microcrystalline silicon samples [μc-Si:H(B)] were deposited by plasma-enhanced chemical vapor deposition, using silane $(SiH_4)$ diluted in hydrogen, and diborane $(B_2H_6)$ as a dopant gas. The concentration of $B_2H_6$ in $SiH_4$ was varied in the range of 0-100 ppm. The density of states was obtained from the thermally stimulated conductivity technique and compared with results obtained by the modulated photoconductivity methods. To explain the poor agreement between the density of states obtained from the thermally stimulated conductivity and the other methods, it is shown by means of numerical simulations that the density of states is very sensitive to experimental errors introduced in the calculation of the $μ_{n}τ_{n}$ product (mobility of electron × lifetime of the electron). The thermally stimulated conductivity method is applied here for the first time to calculate the density of defect states in the forbidden band of μc-Si:H samples.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 174-176
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    General analysis of broadband signal spatial filtration
    Autorzy:
    Salamon, R.
    Rudnicki, M.
    Schmidt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332491.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    acoustics
    spatial filtration
    underwater acoustic
    Opis:
    The majority of underwater acoustic systems use narrow band sounding signals. Consequently, there is extensive knowledge on how the relevant spatial filters should be analysed and designed. The difficulty begins when the sounding signal has a broad spectrum. Applying the results of narrow band signal analysis to broadband signals leads to serious errors. The same is true for spatial filtration methods when applied to narrow band signals. The article presents a general method for analysing spatial filters designed for broadband signals. It also gives an assessment of the errors caused by applying spatial filtration methods designed for narrow band signals.
    Źródło:
    Hydroacoustics; 2003, 6; 251-260
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Underwater communication system for shallow water using modified MFSK modulation
    Autorzy:
    Schmidt, J.
    Zachariasz, K.
    Salamon, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/332663.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper describes the design and operation of the Modified MFSK system for underwater communication. Its function is to transmit data and commands from ships to underwater objects in shallow coastal waters and lakes. The system was primarily required to ensure energy efficiency in its underwater section and the minimum of transmission errors. The emphasis was on non-linear distortions produced in piezoelectric transducers, an untypical source of errors.
    Źródło:
    Hydroacoustics; 2005, 8; 179-184
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Feeding ecology of sprat (Sprattus sprattus L.) and sardine (Sardina pilchardus W.) larvae in the German Bight, North Sea
    Autorzy:
    Voss, R.
    Dickmann, M.
    Schmidt, J.O.
    Powiązania:
    https://bibliotekanauki.pl/articles/47806.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    German Bight
    sprat
    coexistence
    Sprattus sprattus
    North Sea
    habitat preference
    food competition
    Sardina pilchardus
    larva
    sardine
    feeding ecology
    Opis:
    The abundance of the sardine in the North Sea suddenly increased after 1995. Since 2002, the sardine has been spawning regularly in the German Bight, and all its life stages can be found in the area. The larval feeding ecology of two small pelagic clupeiform species with very similar life histories was investigated, the particular aim being to determine signs of food overlap. The distribution and feeding of sprat and sardine larvae were investigated during late spring 2003 on two transects covering a wide range of environmental conditions in the German Bight. Larvae co-occurred at all the stations investigated. Sprat and sardine larvae shared a wide range of prey types. Gut fullness and feeding success were similar in both species; however, potential food competition is avoided to some extent by different habitat preferences.
    Źródło:
    Oceanologia; 2009, 51, 1; 117-138
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silent sonar with matched filtration
    Autorzy:
    Salamon, R.
    Marszal, J.
    Schmidt, J.
    Rudnicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/331754.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Radars with continuous wave frequency (CW FM sonars) are used in radiolocation as ‘silent radars’. They determine the distance to target by measuring the difference between the frequency of the sounding signal and echo signal. The article presents the principle of operation and parameters of silent CW FM sonars. Target distance determined by these sonars is based on the signal at the output of the matched filter. The Doppler effect is studied in detail to identify its effect on the sonar’s parameters. The results of theoretical calculations are presented together with the results of the sonar’s computer simulation.
    Źródło:
    Hydroacoustics; 2011, 14; 199-208
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Doppler effect in the cw fm sonar
    Autorzy:
    Marszal, J.
    Salamon, R.
    Zachariasz, K.
    Schmidt, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/331758.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    When sonars are used for military purposes they have to ensure unobtrusive operation, afeature that can be potentially secured by ‘silent sonars’ or continuous wave frequency modulation sonars (CW FM sonars). The article presents how these sonars operate and identifies the relations between their parameters. The Doppler effect and its impact on the CW FM sonar are studied to identify how it affects the sonar’s parameters. The results of simplified theoretical calculations are supported with results of computer simulations of a more realistic model.
    Źródło:
    Hydroacoustics; 2011, 14; 157-164
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic stabilization of beams in sonar with cylindrical array
    Autorzy:
    Marszal, J.
    Leśniak, W.
    Salamon, R.
    Schmidt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332362.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The article presents the principle of operation of the beamformer of sonar with a cylin-drical array. It demonstrates that a modified beamformer can be used for beam electronic stabilization. The paper presents the algorithm of a digital beamformer used to ensure that the beam’s axis is maintained in a horizontal plane when the ship’s pitch and roll are known. Finally, the article gives an overview of the technical problems of electronic beam deflection.
    Źródło:
    Hydroacoustics; 2006, 9; 119-124
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A CFD package for the 3D Navier-Stokes computation of unsteady flows in turbomachines
    Autorzy:
    Thermann, H.
    Schmidt, S.
    Weiss, C.
    Niehuis, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1967647.pdf
    Data publikacji:
    2001
    Wydawca:
    Politechnika Gdańska
    Tematy:
    CFD
    computational fluid dynamics CFD
    turbomachinery
    laminar-to-turbulent transition
    flutter
    clocking
    Navier-Stokes package
    Opis:
    A 3D Navier-Stokes package for the time-accurate computation of unsteady flows in turbomachines with emphasis on wide applicability, portability and efficiency is presented. The package consists of three components: the elliptic grid generator FRAME, the parallelised implicit Reynolds- and Favre-averaged Navier-Stokes solver PANTA and the post-processor TREAT especially designed for unsteady flow phenomena. The applicability of the package covers both rotor/stator interaction and blade flutter phenomena in multirow and multipassage 2D, Quasi3D and general 3D configurations in a wide range of flow velocities (subsonic, transonic). For turbulent computations either a Low-Reynolds-Number k-" or k-! turbulence model is available. Additionally, an algebraic transition model can be chosen from a variety of different models to enhance the accuracy of prediction for transitional flow phenomena. A description of the underlying algorithms and numerical methods as well as the main features and characteristics of each of the three components is given. Furthermore, selected examples of typical turbomachinery applications are shown to demonstrate these features.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 4; 537-547
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The first record of Aelurostrongylus abstrusus [Angistrongylidae: Nematoda] in Eurasian lynx [Lynx lynx L.] from Poland based on fecal analysis
    Autorzy:
    Szczęsna, J.
    Popiołek, M.
    Schmidt, K.
    Kowalczyk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2146355.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    parasitic disease
    Lynx lynx
    first record
    Polska
    Nematoda
    Eurasian lynx
    animal disease
    parasite
    parasitology
    fecal analysis
    nematode
    Aelurostrongylus abstrusus
    Angistrongylidae
    Opis:
    Material. Thirty eight fecal samples of Eurasian Lynx (Lynx lynx L.) collected in Białowieża Primeval Forest (E Poland) in years 2001-2004 were analysed. Results. The presence of Aelurostrongylus abstrusus (L1) larvae was evidenced by use of decantation and flotation methods. The general prevalence of the infection recorded during the study was 21.1%, whereas mean intensity was 11,5 (1-33 larvae per sample). To our knowledge, this is the first case of Aelurostrongylus abstrusus recorded in Euroasian lynx from Poland.
    Źródło:
    Wiadomości Parazytologiczne; 2006, 52, 4; 321-322
    0043-5163
    Pojawia się w:
    Wiadomości Parazytologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The first record of Aelurostrongylus abstrusus [Angistrongylidae: Nematoda] in Eurasian lynx [Lynx lynx L.] from Poland based on fecal analysis
    Autorzy:
    Szczesna, J
    Popiolek, M.
    Schmidt, K.
    Kowalczyk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/840073.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    parasitic disease
    Lynx lynx
    first record
    Polska
    Nematoda
    Eurasian lynx
    animal disease
    parasite
    parasitology
    fecal analysis
    nematode
    Aelurostrongylus abstrusus
    Angistrongylidae
    Opis:
    Material. Thirty eight fecal samples of Eurasian Lynx (Lynx lynx L.) collected in Białowieża Primeval Forest (E Poland) in years 2001-2004 were analysed. Results. The presence of Aelurostrongylus abstrusus (L1) larvae was evidenced by use of decantation and flotation methods. The general prevalence of the infection recorded during the study was 21.1%, whereas mean intensity was 11,5 (1-33 larvae per sample). To our knowledge, this is the first case of Aelurostrongylus abstrusus recorded in Euroasian lynx from Poland.
    Źródło:
    Annals of Parasitology; 2006, 52, 4
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    O wymaganiach srodowiskowych rysia eurazjatyckiego Lynx lynx do bezposredniego wykorzystania w aktywnej ochronie gatunku w Polsce
    About habitat requirements of Eurasian lynx Lynx lynx for direct use in active conservation of the species in Poland
    Autorzy:
    Schmidt, K
    Podgorski, T.
    Kowalczyk, R.
    Gulczynska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/881389.pdf
    Data publikacji:
    2007
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Leśny Zakład Doświadczalny. Centrum Edukacji Przyrodniczo-Leśnej w Rogowie
    Tematy:
    ssaki
    miejsca odpoczynku
    ochrona czynna
    miejsca polowania
    rys
    wymagania srodowiskowe
    Lynx lynx
    Opis:
    Ryś jest w Polsce gatunkiem chronionym, ale bierna ochrona nie przyniosła dotąd zadowalających efektów. Zasięg występowania rysia zmniejszył się w północnowschodniej Polsce w ciągu ostatnich 20 lat. Ponieważ biologia rysia jest ściśle związana ze środowiskiem leśnym, podjęto próbę scharakteryzowania wybiórczości środowiskowej tego gatunku i określenia, jakie cechy otoczenia odgrywają rolę w ich podstawowych czynnościach biologicznych – polowaniu i odpoczynku. W tym celu przeanalizowano dane dotyczące charakterystyki środowiskowej miejsc odpoczynku i polowania rysi w Puszczy Białowieskiej uzyskane w trakcie badań telemetrycznych. Łącznie zlokalizowano 98 miejsc polowania i 80 miejsc odpoczynku 3 samców i 2 samic rysia oraz porównano je z opisem 81 miejsc losowych. W polowaniu szczególnie istotna okazała się duża liczba struktur ułatwiających podejście ofiary (zwalone pnie, wykroty, zarośla). Ważną rolę w polowaniu rysi odgrywały śródleśne polany z rozwiniętym runem i naturalnym odnowieniem z powodu ich atrakcyjności jako miejsca żerowania ssaków roślinożernych i dobrych warunków podchodzenia ofiar. Wykazano również, że miejsca zabicia ofiar charakteryzują się mniejszym zwarciem drzewostanu i większą widocznością niż miejsca ich późniejszego ukrycia. Miejsca odpoczynku charakteryzowały się gęstszym podszytem, większym zwarciem drzewostanu i niższym stopniem widoczności niż miejsca losowe. Młodniki były wybierane na odpoczynek częściej niż wynikałoby to z ich dostępności. Wyniki tych badań pokazują szczegółowe cechy środowiska, które zapewniają rysiom skuteczność polowania i bezpieczeństwo w trakcie odpoczynku. Na podstawie wymagań biologii rysia zaproponowano sposoby jego aktywnej ochrony poprzez odpowiednią restrukturyzację środowisk leśnych. Konieczność podjęcia takich działań jest szczególnie pilna na obszarach leśnych o uproszczonej strukturze lasu, które znajdują się w zasięgu potencjalnego występowania rysia w Polsce. Przebudowa struktury lasu w celu jej dostosowania do wymagań rysia może przyczynić się do zwiększenia jego liczebności, jak również do rozszerzenia zasięgu występowania gatunku.
    The lynx is a protected species in Poland, however, its passive protection have not brought satisfactory effects. The range of lynx has decreased in NE Poland during recent 20 years. As the lynx biology is strictly related to the forest habitat we attempted at describing the habitat selectivity of this species and determining, which traits of the environment are crucial for their basic biological functions – hunting and resting. For that we analyzed data on habitat characteristics in hunting and resting sites of lynx in Białowieża Forest obtained during telemetry research. In total 98 hunting and 80 resting sites of 3 male and 2 female lynx were found and compared with 81 random sites. The presence of high number of structures suitable for stalking (uprooted trees, fallen logs, bush) was particularly important for hunting. Small forest glades were also selected by lynx for their function as foraging sites of herbivores and good stalking opportunities. The actual killing sites had higher visibility than the sites where the prey was hidden. The lynx resting sites had lower visibility and denser undergrowth and tree stands than random sites. Young thickets were chosen by lynx more often than at random. The results show the detailed habitat characteristics that ensure the effectiveness of hunting and the safety when resting for the lynx. We propose some active conservation measures for the lynx in Poland corresponding to their biological requirements through relevant restructuring of the forest habitat. Such attempts are particularly urgent in the forests with simplified structure that occur in the potential range of the lynx in Poland. The restructuring of the forests in accordance with lynx requirements may contribute to increasing their numbers as well as to expand the range of the species.
    Źródło:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej; 2007, 09, 2-3[16] cz.2
    1509-1414
    Pojawia się w:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PANI/NaTaO3 composite photocatalyst for enhanced hydrogen generation under UV light irradiation
    Autorzy:
    Zielińska, B.
    Schmidt, B.
    Mijowska, E.
    Kaleńczuk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/778752.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    polyaniline
    NaTaO3
    composite photocatalysts
    hydrogen generation
    Opis:
    A PANI/NaTaO3  composite was successfully synthesized by an oxidative polymerization of aniline monomer in hydrochloric acid solution containing sodium tantalate. NaTaO3  at a monoclinic structure was produced via hydrothermal method. The photocatalytic activities of the unmodified NaTaO3  and PANI/NaTaO3  were evaluated for hydrogen generation from an aqueous HCOOH solution and under UV light irradiation. The results showed that the evolution rate of H2  increased significantly when NaTaO3  was modified with PANI. The enhancement of the photocatalytic activity of PANI/NaTaO3  composite was ascribed to the effective charge transfer and separation between NaTaO3  and PANI, which reduced their recombination. This indicates that PANI modification of tantalate photocatalysts may open up a new way to prepare highly efficient catalytic materials for H2  generation.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 3; 115-119
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exotic phase transitions in RERhSn compounds
    Autorzy:
    Łątka, K.
    Kmieć, R.
    Kruk, R.
    Pacyna, A.
    Rams, M.
    Schmidt, T.
    Pöttgen, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/148856.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    magnetic properties
    phase transitions
    Mössbauer spectroscopy
    Opis:
    Crystal and magnetic properties of three equiatomic ternary RERhSn compounds (where RE = Ce, Nd, Gd) have been studied by means of X-ray diffraction, ac, and dc magnetic susceptibility measurements, as well as using Mössbauer spectroscopy with 119Sn and 155Gd resonances. CeRhSn does not order magnetically down to 2 K while NdRhSn undergoes ferromagnetic transition at TC = 10.3 K and GdRhSn orders antiferromagnetically below TN = 16 K. Our CeRhSn and NdRhSn samples become superconductive below 6.5 K and 6.9 K, respectively.
    Źródło:
    Nukleonika; 2003, 48,suppl.1; 35-40
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient RGB-D data processing for feature-based self-localization of mobile robots
    Autorzy:
    Kraft, M.
    Nowicki, M.
    Penne, R.
    Schmidt, A.
    Skrzypczyński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/330295.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    visual odometry
    simultaneous localization
    simultaneous mapping
    RGB-D
    tracking
    point features
    odometria wizyjna
    lokalizacja jednoczesna
    śledzenie
    Opis:
    The problem of position and orientation estimation for an active vision sensor that moves with respect to the full six degrees of freedom is considered. The proposed approach is based on point features extracted from RGB-D data. This work focuses on efficient point feature extraction algorithms and on methods for the management of a set of features in a single RGB-D data frame. While the fast, RGB-D-based visual odometry system described in this paper builds upon our previous results as to the general architecture, the important novel elements introduced here are aimed at improving the precision and robustness of the motion estimate computed from the matching point features of two RGB-D frames. Moreover, we demonstrate that the visual odometry system can serve as the front-end for a pose-based simultaneous localization and mapping solution. The proposed solutions are tested on publicly available data sets to ensure that the results are scientifically verifiable. The experimental results demonstrate gains due to the improved feature extraction and management mechanisms, whereas the performance of the whole navigation system compares favorably to results known from the literature.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2016, 26, 1; 63-79
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bearing errors in passive sonar stationary target location
    Autorzy:
    Schmidt, A.
    Marszal, J.
    Salamon, R.
    Jedel, A.
    Ostrowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/332830.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    bearing errors
    passive sonar
    hydroacoustics
    Opis:
    The paper presents a method for determining the coordinates of stationary targets using passive sonar bearing. It identifies the requirements sonar movements must meet to keep the incorrect determination of coordinates to a minimum. It gives the relations, which help determine coordinate errors analytically. Numerical experiments are used to demonstrate the success of the analysis.
    Źródło:
    Hydroacoustics; 2009, 12; 189-200
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method for improving multibeam sonar bearing accuracy
    Autorzy:
    Leśniak, W.
    Marszal, J.
    Salamon, R.
    Zachariasz, K.
    Schmidt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332790.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    multibeam sonar
    sonar bearing accuracy
    sonars
    Opis:
    The paper presents a simple method for improving multibeam sonar bearing accuracy. The principle proposed here is similar to the monopulse method, a solution commonly used in radars and sonars. With no manual or automatic beam rotation, the method offers a substantial reduction in the demand for sonar computational effort. It significantly reduces bearing error for a relatively high signal to noise ratio. The paper gives a boundary value of the output signal to noise ratio which when exceeded satisfactorily improves bearing accuracy.
    Źródło:
    Hydroacoustics; 2009, 12; 98-108
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation of the influence of a fillet and a bulb on the secondary flow in a compressor cascade
    Autorzy:
    Hoeger, M.
    Schmidt-Eisenlohr, U.
    Gomez, S.
    Sauer, H.
    Müller, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1986762.pdf
    Data publikacji:
    2002
    Wydawca:
    Politechnika Gdańska
    Tematy:
    secondary flow
    compressor cascade
    fillet
    bulb
    Opis:
    Large fillet radii are typically found on highly loaded compressor rotors to ensure structural integrity. The objective of this paper is to investigate the impact of such real geometry effects on the flow at the hub section. Investigations were performed numerically for the idealised case of a plane compressor cascade with the 3D Navier-Stokes code TRACE_S. Realistic inlet boundary layer displacement thickness and typical loading levels close to stall are considered at low inlet Mach numbers Ma1 = 0.23. A large fillet with a relative radius of 16% chord length is considered as well as a 3D leading edge bulb-configuration designed at TU Dresden. The results are discussed in terms of iso-Mach surfaces, secondary flow patterns and spanwise incidence and turning. A complex 3D vortex system rises from the fillet radius, which improves the aerodynamic behaviour of the cascade at the end-wall section. With the bulb configuration the suction surface horse-shoe vortex leg was demonstrated to weaken the undesirable cross flow and by that to reduce the hazard of corner stall.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 1; 25-37
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distributed and collaborative product engineering for MEMS
    Autorzy:
    Schmidt, T.
    Hahn, K.
    Mielke, M.
    Brück, R.
    Ortloff, D.
    Popp, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/397827.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    produkt inżynierii
    projekt MNT
    projekt procesowy
    zarządzanie informacją
    product engineering
    MNT design
    process design
    information management
    distributed multi-site engineering
    Opis:
    Small and inexpensive acceleration sensors, cameras, microphones, micro-mirrors, touch-panels and other products of the MNT industry are the core components of almost every new and innovative electronic appliance. Customer-tailored functions and specifications require a deep involvement of the customer throughout the whole value chain. Often the varying stages of the product engineering flow are carried out by diverse companies (or at least different departments) in different locations. With "time to market" being essential, a fast and effective product engineering approach along with comprehensive software support is required. In this paper we introduce a comprehensive methodology and based on that a concept for a distributed environment for customer-oriented product engineering of MEMS products. The development is currently carried out in an international EU research project.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2010, 1, 3; 277-286
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of KERENA emergency condenser
    Autorzy:
    Bryk, R.
    Schmidt, H.
    Mull, T.
    Wagner, T.
    Ganzmann, I.
    Herbst, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/240358.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    condensation
    Kerena
    emergency condenser
    Modelica
    OpenModelica
    kondensacja
    kondensator awaryjny
    Opis:
    KERENA is an innovative boiling water reactor concept equipped with several passive safety systems. For the experimental verification of performance of the systems and for codes validation, the Integral Test Stand Karlstein (INKA) was built in Karlstein, Germany. The emergency condenser (EC) system transfers heat from the reactor pressure vessel (RPV) to the core flooding pool in case of water level decrease in the RPV. EC is composed of a large number of slightly inclined tubes. During accident conditions, steam enters into the tubes and condenses due to the contact of the tubes with cold water at the secondary side. The condensed water flows then back to the RPV due to gravity. In this paper two approaches for modeling of condensation in slightly inclined tubes are compared and verified against experiments. The first approach is based on the flow regime map. Depending on the regime, heat transfer coefficient is calculated according to specific semi-empirical correlation. The second approach uses a general, fully-empirical correlation. The models are developed with utilization of the object-oriented Modelica language and the open-source OpenModelica environment. The results are compared with data obtained during a large scale integral test, simulating loss of coolant accident performed at Integral Test Stand Karlstein (INKA). The comparison shows a good agreement. Due to the modularity of models, both of them may be used in the future in systems incorporating condensation in horizontal or slightly inclined tubes. Depending on his preferences, the modeller may choose one-equation based approach or more sophisticated model composed of several exchangeable semi-empirical correlations.
    Źródło:
    Archives of Thermodynamics; 2017, 38, 4; 29--51
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of nanostructured bulk cobalt triantimonide doped with tellurium and indium prepared by pulsed plasma in liquid method
    Autorzy:
    Zybała, R.
    Schmidt, M.
    Kaszyca, K.
    Chmielewski, M.
    Kruszewski, M. J.
    Jasiński, M.
    Rajska, M.
    Ciupiński, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/200831.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoelectric materials
    nanostructured materials
    skutterudite
    energy harvesting
    spark plasma sintering
    Opis:
    One of the ways to decrease thermal conductivity is nano structurization. Cobalt triantimonide (CoSb3) samples with added indium or tellurium were prepared by the direct fusion technique from high purity elements. Ingots were pulverized and re-compacted to form electrodes. Then, the pulsed plasma in liquid (PPL) method was applied. All materials were consolidated using rapid spark plasma sintering (SPS). For the analysis, methods such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) with a laser flash apparatus (LFA) were used. For density measurement, the Archimedes’ method was used. Electrical conductivity was measured using a standard four-wire method. The Seebeck coefficient was calculated to form measured Seebeck voltage in the sample placed in a temperature gradient. The preparation method allowed for obtaining CoSb3 nanomaterial with significantly lower thermal conductivity (10 Wm–1K–1 for pure CoSb3 and 3 Wm–1K–1 for the nanostructured sample in room temperature (RT)). The size of crystallites (from SEM observations) in the powders prepared was about 20 nm, joined into larger agglomerates. The Seebeck coefficient, α, was about –200μVK–1 in the case of both dopants, In and Te, in microsized material and about −400 μK−1 for the nanomaterial at RT. For pure CoSb3 , α was about 150 μVK−1 and it stood at −50 μVK−1 for nanomaterial at RT. In bulk nanomaterial samples, due to a decrease in electrical conductivity and inversion of the Seebeck coefficient, there was no increase in ZT values and the ZT for the nanosized material was below 0.02 in the measured temperature range, while for microsized In-doped sample it reached maximum ZT = 0.7 in (600K).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 125-134
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strong Electric Field Driven Carrier Transport Non-Linearities in n-Type GaAs/AlGaAs Superlattices
    Autorzy:
    Subačius, L.
    Venckevičius, R.
    Kašalynas, I.
    Seliuta, D.
    Valušis, G.
    Schmidt, J.
    Lisauskas, A.
    Roskos, H.
    Alekseev, K.
    Köhler, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505524.pdf
    Data publikacji:
    2011-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.65.Cd
    06.60.Jn
    73.90.+f
    Opis:
    Nanosecond pulsed technique was used to study and discriminate strong electric field induced effects in carrier transport in silicon doped GaAs/$Al_{0.3}Ga_{0.7}As$ superlattices at room temperature. The experiment shows that the superlattice can serve as gain media to employ parametric phenomena for microwave amplification.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 2; 167-169
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modernization of ASW sonar SQS-56 at Gdansk University of Technology
    Autorzy:
    Marszal, J.
    Schmidt, J.
    Salamon, R.
    Kilian, L.
    Raganowicz, A.
    Zachariasz, K.
    Ostrowski, Z.
    Jedel, A.
    Rudnicki, M.
    Sidorko, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/331991.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The fast development of electronic technology and digital signal processing methods makes electronic devices, including sonar systems ones, obsolete very quickly. On the other hand the ships mechanical components including mechanical parts of sonars are operational for a few dozens of years. It makes good opportunity to modernize these devices by using modern electronic devices and new digital signal processing methods with application of existing antenna and mechanical systems. The paper presents the modernization of ASW sonar SQS-56 on the Polish frigate ORP “Kościusko”. The aim of modernization, the new parameters of the sonar and block diagram after modernization are presented.
    Źródło:
    Hydroacoustics; 2010, 13; 191-196
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of Antimony Telluride for Thermoelectric and Optoelectronic Applications
    Autorzy:
    Zybała, R.
    Mars, K.
    Mikuła, A.
    Bogusławski, J.
    Soboń, G.
    Sotor, J.
    Schmidt, M.
    Kaszyca, K.
    Chmielewski, M.
    Ciupiński, L.
    Pietrzak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/352428.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    antimony telluride
    thermoelectric materials
    thin films
    PVD magnetron sputtering
    topological insulator
    Opis:
    Antimony telluride (Sb2 Te3 ) is an intermetallic compound crystallizing in a hexagonal lattice with R-3m space group. It creates a c lose packed structure of an ABCABC type. As intrinsic semiconductor characterized by excellent electrical properties, Sb2 Te3 is widely used as a low-temperature thermoelectric material. At the same time, due to unusual properties (strictly connected with the structure), antimony telluride exhibits nonlinear optical properties, including saturable absorption. Nanostructurization, elemental doping and possibilities of synthesis Sb2 Te3 in various forms (polycrystalline, single crystal or thin film) are the most promising methods for improving thermoelectric properties of Sb2Te3.Applications of Sb2 Te3 in optical devices (e.g. nonlinear modulator, in particular saturable absorbers for ultrafast lasers) are also interesting. The antimony telluride in form of bulk polycrystals and layers for thermoelectric and optoelectronic applications respectively were used. For optical applications thin layers of the material were formed and studied. Synthesis and structural characterization of Sb2 Te3 were also presented here. The anisotropy (packed structure) and its influence on thermoelectric properties have been performed. Furthermore, preparation and characterization of Sb2 Te3 thin films for optical uses have been also made.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1067-1070
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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