Wyniki wyszukiwania - BazTech

1

Estimation of the angular position of a two–wheeled balancing robot using a real IMU with selected filters

Laddach Krzysztof, Łangowski Rafał, Zubowicz Tomasz

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2022

|

Vol. 70, nr 2

art. no. e140518

EN

A low–cost measurement system using filtering of measurements for two–wheeled balancing robot stabilisation purposes has been addressed in this paper. In particular, a measurement system based on gyroscope, accelerometer, and encoder has been considered. The measurements have been corrected for deterministic disturbances and then filtered with Kalman, a–b type, and complementary filters. A quantitative assessment of selected filters has been given. As a result, the complete structure of a measurement system has been obtained. The performance of the proposed measurement system has been validated experimentally by using a dedicated research rig.

2

Efficiency of Filters Filled with Rockfos for Phosphorus Removal from Domestic Sewage

Pytka-Woszczyło Aneta, Różańska-Boczula Monika, Gizińska-Górna Magdalena, Marzec Michał, Listosz Agnieszka, Jóźwiakowski Krzysztof

Advances in Science and Technology. Research Journal

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2022

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Vol. 16, no 4

176--188

EN

The goal of the present study was to evaluate the efficiency of filters filled with Rockfos for removal of phosphorus (Total-P) from domestic wastewater using, Rockfos is a material obtained by calcination of carbonate-silica rock (opoka) at a temperature of 900 °C. A field study was conducted in two filters with volumes of 2.0 and 0.8 m3 which were components of hybrid constructed wetlands with an average capacity of 2.0 m3/L, located in two national parks in south eastern Poland. Samples of the influent to and the effluent from the filters were analyzed for Total-P concentrations and pH. Eighty sewage samples were tested over a five year study period. It was shown that the test filters removed Total-P with an average efficiency of 31.5% and 30.2% and that they could be successfully used to remove P from domestic wastewater in small wastewater treatment plants.

3

Ka Band-pass Filter Based on SIW Technology for Wireless Communications

Damou Mehdi, Benallou Yassine, Chetioui Mohammed, Boudkhil Abdelhakim, Berber Redouane

Journal of Telecommunications and Information Technology

|

2021

|

nr 2

49--56

EN

The paper proposes a new third-order Chebyshev bandpass filter based on the substrate integrated waveguide (SIW) manufacturing technology using an inductive iris and a defected ground structure (DGS) station to resonate in the Ka frequency band, intended for wireless communication applications. All steps that are necessary for designing such a filter have been described in detail based on specific analytical equations harnessed to calculate the different synthesizable parameters of the proposed band-pass filter design, such as the coupling matrix, quality coefficients and initial geometric dimensions. The filter’s ideal frequency response is extracted from an equivalent circuit employing localized elements developed with the use of Design Microwave Office Software. Otherwise, HFSS is employed to set the initial parameters of the proposed topology that will not meet the target specifications defined previously. Accordingly, optimization procedures are necessary for different SIW band-pass filter parameters to reach a high frequency response for the proposed design. The detailed results presented show high efficiency of the SIW technology that offers good performance with lower filter volumes. Two topologies have been developed and then optimized to demonstrate the usefulness of EM software.

4

Praktyczne aspekty zapewniania odpowiedniej jakości powietrza w budynkach szkolnych

Urasiński Michał

Rynek Instalacyjny

|

2019

|

Nr 1-2

40--46

PL

W artykule opisano skutki długotrwałego przebywania uczniów w pomieszczeniach nieodpowiednio wentylowanych i bez uzdatniania powietrza zewnętrznego, w tym zanieczyszczonego smogiem. Podano przykłady rozwiązań układów wentylacyjnych dla obiektów szkolnych poddawanych modernizacji i remontom. Porównano koszty inwestycyjne i eksploatacyjne scentralizowanego i zdecentralizowanego układu wentylacyjnego.

EN

This article treats about effects of pupils residence in classrooms that are not sufficiently ventilated, where outside air is not conditioned and polluted with smog. Some examples of ventilation systems for school facilities are given, if they need to be renovated or modernized. It includes a comparison of investment and running costs, both for central and decentralized ventilation systems.

5

The effect of liquid filtering parameters on insecticidal nematodes survival (viability) - biological plant protection product

Pachuta A., Chojnacki J.

Journal of Research and Applications in Agricultural Engineering

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2018

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Vol. 63, nr 3

40--44

EN

The described research dealt with the viability of insecticidal nematodes contained in the spray liquid flowing through filters used in spraying machines. Steinernema feltiae entomopathogenic nematodes were used in the research. The liquid was filtered using two filters mounted in spraying machines with 50 and 100 mesh number. Concentration of nematodes in the liquid was: 1 million and 2 million in 1 dm3 water. The liquid flowed at three pressure values: 1x105, 2×105 and 4×105 Pa. Significance of nematodes loss with the following liquid flow was observed: through 50 mesh filter (at pressure 4×105 Pa) and through 100 mesh filter (at all flow pressure values).

PL

Opisano badania nad zmianami przeżywalności owadobójczych nicieni zawartych w cieczy opryskowej przepływającej przez filtry stosowane w opryskiwaczach. Do badań użyto nicieni owadobójczych gatunku Steinernema feltiae. Ciecz filtrowana była za pomocą dwóch filtrów montowanych w rozpylaczach o liczbie mesh 50 i 100. Koncentracja nicieni w cieczy wynosiła: 1 mln i 2 mln sztuk w 1 dm3 wody. Przepływ cieczy odbywał się przy trzech wielkościach ciśnienia: 1x105, 2×105 i 4×105 Pa. Stwierdzono istotność strat nicieni przy przepływie cieczy: przez filtr mesh 50 (przy ciśnieniu 4×105 Pa) i przez filtr mesh 100 (przy wszystkich wartościach ciśnienia przepływu). Wyniki pokazały, że na straty nicieni istotny wpływ miały: numer siatki filtra i ciśnienie cieczy wewnątrz instalacji.

6

Projekty aktywnych filtrów analogowych

Kagankiewicz F.

Aparatura Badawcza i Dydaktyczna

|

2018

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T. 23, nr 3

122--127

PL

Punktem wyjścia do artykułu był fakt, że nie w każdej aplikacji jest możliwe wykorzystanie filtrów cyfrowych, w związku z czym podjęto się wykonania projektów aktywnych filtrów analogowych. W pracy opisano metody projektowania aktywnych filtrów analogowych. Przedstawiono trzy główne metody projektowania takie jak Sallen-Key, Multiple Feedback oraz Linkwitz-Riley. W drugiej części pracy zostały przedstawione dwa projekty filtrów: dolnoprzepustowego oraz górnoprzepustowego, o częstotliwości granicznej 1 kHz, które miały za zadanie charakteryzować się wysokim tłumieniem w paśmie zaporowym.

EN

The starting point for the article was the fact that it is not possible to use digital filters in every application, therefore active analogue filter designs have been made. The paper describes methods of designing active analog filters, three main design methods are presented, such as Sallen-Key, Multiple Feedback and Linkwitz-Riley. The second part of the work presents two designs of lowpass and highpass filters, which have 1 kHz limit frequency. The objective was that filters should have a high attenuation in the stop band.

7

Zastosowanie węgla aktywnego i krzemionki jako adsorberów benzo(a)pirenu i antracenu

Krogulska I., Łysoń M., Maślanka K., Mikołajczyk N.

Analit

|

2017

|

Nr 4

20--31

PL

Wielopierścieniowe węglowodory aromatyczne (WWA) to często spotykane zanieczyszczenia organiczne środowiska. Biorąc pod uwagę ich niekorzystny wpływ na zdrowie człowieka konieczne jest ich wykrycie i eliminacja z wód powierzchniowych. Jako wskaźniki obecności tej grupy zastosowano antracen i benzo(a)piren, ze względu na dobrze poznane właściwości. W celu usunięcia ich z wody wykorzystano dwa rodzaje materiałów filtracyjnych i porównano ich efektywność. Oznaczenie wykonano metodą wysokosprawnej chromatografii cieczowej, HPLC (ang. High Performance Liquid Chromatography).

EN

Polycyclic aromatic hydrocarbons (PAH) are common environmental pollutants. Regarding their negative effects on human health, they must be detected and eliminated from surface water. Due to well-known properties, the anthracene and benzo(a)pyrene were used as indicators of the presence of this group. Two types of filters were used to remove them from the water and their efficiencies were compared. The assay was performed by high performance liquid chromatography (HPLC).

8

The influence of microorganisms inhabiting in the environment of diesel and lubricating oil to the operation of machinery and marine equipment

Krakowski R.

Journal of KONES

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2016

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Vol. 23, No. 2

201--208

EN

In this article, the problem of microbial contamination occurring in the fuels and oils was presented. It shows the types of microorganisms and the conditions for their growth. Then the factors influencing the growth of bacteria in petroleum products were described in detail. In the next section the symptoms, development and contamination of petroleum products was discussed. The influence of microbial contamination on the marine engine fuel system and the problems that this brings were also presented. In the following part of the article, the impact of microbial contamination of fuel tanks and purifiers was described. Then the causes of sludge were discussed and contamination layers in the settling tanks were presented. In the next part of the article the fuel impact modelling of microbial contamination on filtration efficiency was performed. The modelling presented in the article is an example showing how undesirable phenomenon is the microbial contamination and how pollution affects the other elements of the entire system. As part of the modelling, numerical model of filtration with the solution was presented. Then analysis results on the basis of the impurities concentration characteristics in the fuel as a function of the fouling thickness in the partition of the filter is performed. The development of impurities was divided into three stages. For each case the line trend and forecast further growth after the application of measures to prevent the proliferation of microorganisms were designated. The article was completed applications, of which the most important is the need to combat harmful microorganisms. And besides, there is a need to find new methods of combating microbial contamination that will not destroy beneficial microorganisms and will be environmentally friendly.

9

Doświadczenia z eksploatacji pośpiesznych filtrów grawitacyjnych w SUW Zawada

Kłosok-Bazan I., Filipowski M., Szczepankiewicz J.

Instal

|

2016

|

nr 1

47--49

PL

Ujęcie wody w Zawadzie eksploatuje wody podziemne o podwyższonej zawartości żelaza i manganu, współwystępujące w wodzie ze związkami organicznymi. Jakość wody wymusza zastosowanie procesów uzdatniania obejmujących takie procesy jednostkowe, jak: napowietrzanie, koagulacja, sedymentacja, filtracja i dezynfekcja. Wstępnie uzdatniona woda kierowana jest na pośpieszne filtry grawitacyjne, których eksploatacja jest przedmiotem analiz będących celem niniejszego artykułu.

EN

Water intake in Zawada uses water from a groundwater source with an increased level of iron and manganese content, co-existing with organic substances. In order to obtain good water quality it is necessary to use such water treatment unit processes as: purification, coagulation, sedimentation, filtration and disinfection. Pre-treated water is fed to rapid gravity filters whose use is a subject of this article’s analysis.

10

Enhancement of Seismic Data Processing and Interpretation of Fracture Zones on the Upper Part of Granitic Basement in Cuu Long Basin, Vietnam

Tan M. T., Ha M. T., Marfurt K. J., Hieu N. T., Hanh N. T. M.

Acta Geophysica

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2016

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Vol. 64, no. 6

2214--2231

EN

The fractured granite basement is the primary oil and gas reservoir in the Cuu Long Basin, Vietnam. Due to the complexity of this nonlayered unconventional target, combined with complicated fault and fracture systems, the seismic data quality near and within the basement section is very low. For this reason, it is important to apply improved seismic data processing workflows, filtering and migration techniques, as wells as attribute processing methods to enhance the imaging quality. Our studies show that applying different types of filters, including the f-k, Radon transform and Tau-P, improves signal to noise ratio, removing multiples, revealing basement’s top and its related fractured and fault zones. In addition, the application of multi-arrival-solution migration algorithms, such as Kirchhoff Migration and Controlled Beam Migration, provides improved imaging for identifying basement top and faults and fractures within the basement. Furthermore, the application of seismic attributes such as curvature, apparent dip, or energy gradient, is important in locating faults and fractures, whereas mapping of intensity and orientation of such structures assists the delineation of “sweet spots” and assists the planning of exploration.

11

Komputerowe wspomaganie projektowania filtra do odpylania materiałów w przemyśle rolno-spożywczym

Horyński M. B.

Zeszyty Naukowe. Elektryka / Politechnika Łódzka

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2015

|

z. 126

63--70

PL

Zjawisko oddziaływania pola elektrycznego na cząstki pyłu zaobserwowano pod koniec XVIII wieku. Jednak pierwsze udane próby budowy elektrofiltrów przeprowadzono dopiero na początku XX wieku. Obecnie filtry elektryczne, zwane elektrofiltrami, to urządzenia elektrostatyczne. Ten typ filtrów jest stosowany do odpylania pyłów w przemyśle hutniczym, wydobywczym i energetycznym. Chociaż charakteryzują się one dużą skutecznością odpylania (nawet powyżej 99%), nie znajdują jednak zastosowania w obiektach, w których pyły mają charakter wybuchowy, np. pyły w młynach, kaszarniach itp. W tej gałęzi przemysłu powszechnie stosowane są filtry tkaninowe. Elektrostatyczne oczyszczanie gazów jest w dalszym ciągu dynamicznie rozwijającą się technologią. W połączeniu z technologiami usuwania zanieczyszczeń stanowi z pewnością podstawę dalszego rozwoju elektrofiltrów. W artykule przedstawiono propozycję wykorzystania uzwojenia bifilarnego do odpylania pyłów wybuchowych.

EN

The article presents the proposal to use bifilar winding for extraction of explosive dusts. In the process of cleaning, grinding and transporting grain in elevators, warehouses and mills are generated large amounts of dust. Accordingly, the explosion dangerous concentrations of dust are formed in both the cleaning and the grinding grain. Bifilar windings with voltage supplied DC or AC generates heterogeneous electric field around. This property of bifilar winding can be used to capture particulate matter organic of explosive origin.

12

Ocena przepuszczania światła dla szyb stosowanych w przemyśle motoryzacyjnym

Owczarek G., Gralewicz G.

Prace Instytutu Elektrotechniki

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2015

|

Z. 268

101--106

PL

W niniejszym artykule przedstawiono wyniki badań współczynników przepuszczania światła dla barwionej szyby stosowanej w pojazdach szynowych. Współczynniki te badano w zależności od podejścia w doborze rozkładu illuninantu oraz względnej skuteczności widmowej. Przyjęta metoda badania współczynników przepuszczania światła oraz otrzymane wyniki badań wskazują na konieczność zweryfikowania podejścia w sposobie oceny przepuszczania światła dla barwionych szyb stosowanych w pojazdach mechanicznych.

EN

The paper presents results of investigations of the luminous transmittance for dyed windscreen used in motor vehicles. Dependence on spectral distribution of illuminant and spectral visibility function of the average human eye for daylight and nightlight vision has been analysed. The considered method and obtained results show the necessity of verification of the assessment method for the luminous transmittance of dyed windscreens used in mechanical vehicles.

13

Laboratory and numerical experiments into efficient management of VDR filter plants

Zielina M., Dąbrowski W., Mackie R. I.

Environment Protection Engineering

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2015

|

Vol. 41, nr 3

101--120

EN

runs are achieved when the highest flow through the most recently backwashed filter and the highest available head loss coincide. This rule has previously been published by Dąbrowski, who used a simplified mathematical model of VDR filters developed by Di Bernardo. However, until now no experimental verification of this optimisation approach has been presented. A series of tests were carried out on a laboratory VDR filter plant, using a suspension collected from an industrial sedimentation tank and using alum as a coagulant. The results of the experiments were compared with computations carried out according to a combined unit bed element (UBE)-phenomenological model of deep bed filtration adapted to VDR operation by Mackie and Zhao. It was confirmed that the longest filtration runs did indeed correspond to the pairs of the highest H and q1/qavr. The UBE-phenomenological model of deep bed filtration gave results of computations quite close to experimental results and improved the accuracy of calculations based on the theoretical model by Di Bernardo.

14

Ultraviolet filters for sensors matching biological action spectra

Garoli D, Alaibac M, Pelizzo M G

Optica Applicata

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2014

|

Vol. 44, nr 4

611--620

EN

A considerable interest is growing worldwide about the photobiological effects of the ultraviolet radiation; in fact, it has been demonstrated that ultraviolet radiation can affect both human health as well as the equilibrium of entire ecosystems. The relative effectiveness of ultraviolet radiation at a particular wavelength in producing a specific biological response is defined by an action spectrum. Broadband radiometers characterized by having a spectral response that matches an action spectrum allow the measure of the effective irradiance associated to an ultraviolet source. In this work we present the designs of interference filters to be used in radiometric heads. Their optimized transmission curve coupled to the spectral response of different ultraviolet photodiodes provides the match of the sensor spectral response with some selected action spectra. Development of instruments for the measurement of the effective solar irradiance is foreseen. The design of interferential filters which transmittance curve was optimized in order to match a target biological action spectrum is here presented.

15

Sprężarki i sprężone powietrze. Część 3

Kaiser K.

Technika Chłodnicza i Klimatyzacyjna

|

2013

|

nr 6-7

287--301

PL

Trzecia część cyklu artykułów poświęconych procesowi sprężania powietrza i maszynom roboczym stosowanym do jego realizacji, czyli sprężarkom. W części pierwszej („TCHK”, nr 5/2011) przedstawione zostały obszary zastosowania sprężarek i ich podział ze względu na ciśnienie i zasadę działania, a również zdefiniowane wielkości charakteryzujące takie maszyny robocze. W części drugiej („TCHK”, nr 2/2013) autor omówił parametry opisujące powietrze oraz przemiany, którym ono podlega, natomiast trzecia część poświęcona jest jakości powietrza w instalacjach sprężonego powietrza, w tym stosowanym w nich filtrom.

EN

This is the third part of series of papers dealing with air compression and air compressors. In the first part (, TCHK', nr 5/2011) the range of application and classification of air compressors have been presented. Characteristic quantities have been defined. In the second part (, TCHK', nr 212013) parameters of air and thermodynamic processes have been described. The third part deals with air qua/ity in compressed air installations and air filters.

16

Filtering Enhanced Traffic Management System (ETMS) altitude data

Palacios R., Hansman R. J.

Metrology and Measurement Systems

|

2013

|

Vol. 20, nr 3

453--464

EN

Enhanced Traffic Management System (ETMS) stores all the information gathered by the Federal Aviation Administration (FAA) from aircraft flying in the US airspace. The data stored from each flight includes the 4D trajectory (latitude, longitude, altitude and timestamp), radar data and flight plan information. Unfortunately, there is a data quality problem in the vertical channel and the altitude component of the trajectories contains some isolated samples in which a wrong value was stored. Overall, the data is generally accurate and it was found that only 0.3% of the altitude values were incorrect, however the impact of these erroneous data in some analyses could be important, motivating the development of a filtering procedure. The approach developed for filtering ETMS altitude data includes some specific algorithms for problems found in this particular dataset, and a novel filter to correct isolated bad samples (named Despeckle filter). As a result, all altitude errors were eliminated in 99.7% of the flights affected by noise, while preserving the original values of the samples without bad data. The algorithm presented in this paper attains better results than standard filters such as the median filter, and it could be applied to any signal affected by noise in the form of spikes.

17

On BPI Restricted to Boolean Algebras of Size Continuum

Hall E., Keremedis K.

Bulletin of the Polish Academy of Sciences. Mathematics

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2013

|

Vol. 61, no 1

9--21

EN

(i) The statement P(ω)=“every partition of R has size ≤|R|” is equivalent to the proposition R(ω)=“for every subspace Y of the Tychonoff product 2P(ω) the restriction B|Y={Y∩B:B∈B} of the standard clopen base B of 2P(ω) to Y has size ≤|P(ω)|”. (ii) In ZF, P(ω) does not imply “every partition of P(ω) has a choice set”. (iii) Under P(ω) the following two statements are equivalent: (a) For every Boolean algebra of size ≤|R| every filter can be extended to an ultrafilter. (b) Every Boolean algebra of size ≤|R| has an ultrafilter.

18

Wybrane zagadnienia z cyfrowego przetwarzania sygnałów - prezentacja witryny internetowej

Noga K.

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

|

2012

|

Nr 31

105-108

PL

W artykule przedstawiono opis strony internetowej, która prezentuje wybrane zagadnienia z zakresu cyfrowe-go przetwarzania sygnałów. Strona ta stanowi pomoc dydaktyczną, która powstała w KAO Akademii Morskiej w Gdyni.

EN

This paper presents the description of the webpage which describes selected problems from the Digital Signal Processing field. This webpage is a didactic tool for Gdynia Maritime University students.

19

Wstęp do filtracji o zmiennej prędkości

Dąbrowski W, Dąbrowska B.

Technologia Wody

|

2012

|

Nr 1 (15)

16-21

PL

Opisano podstawowe zasady działania filtrów ze skokowo zmienną wydajnością. W podsumowaniu stwierdzono, że zastosowanie tego sposobu sterowania stacją filtrów może pozwolić na znaczące wydłużenie filtrocykli bez pogorszenia jakości filtratu.

EN

Some principles of Variable Declining Rate Filtration process have been summarizes. It has been concluded that application of this flow controlling process may result in significant extending of filtration runs without deterioration of filtrate quality.

20

An Analysis of Demand for the Selected Group of Spare Parts Illustrated with an Example of Filters for Agricultural Vehicles

Juściński S.

Technical Sciences / University of Warmia and Mazury in Olsztyn

|

2012

|

nr 15(2)

205-216

EN

This paper contains presentation of problems of securing demand for spare parts for agricultural vehicles. Tasks carried out by a distribution and service company, which is the authorized dealer in the sector of agriculture service, have been characterized. The research was conducted for the group of parts including filters of: fuel, engine oil, oil for hydraulic system and gear box for JOHN DEERE agricultural vehicles. Selected parts were cyclically sold in connection with a change during the realization of technical inspections and post-technical inspections. The cycle of the conducted research encompassed the years 2003-2010. The research was carried out in the service department of the authorized dealer of agricultural vehicles of the DEERE & Company concern. The analysis of the number of sold filters in monthly, quarterly and annual arrangement was presented. The research results were statistically analyzed using the R program (v. 2.14.1.). The trend, random fluctuations and seasonal fluctuations for the series of monthly observations were determined. The analysis of the impact of works and agritechnical measures on demand for filters for agricultural vehicles was conducted.