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Tytuł:
Metrological requirements for measurements of circadian radiation
Autorzy:
Jakubowski, P.
Fryc, I.
Powiązania:
https://bibliotekanauki.pl/articles/174805.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
circadian radiation
optical measurement
LED lighting
Opis:
The article presents a definition of circadian radiation and its influence on human beings. Typical sources of this radiation have been discussed and compared. As the availability of devices designed for circadian radiation measurement is very limited, and their quality is rather poor, there is a need for the development of a new meter which would deliver precise data. The paper presents available methods of optical radiation measurement which can be used in a circadian radiation assessment. Advantages and disadvantages of presented methods have been discussed. A light path in typical measurement instruments has been analyzed, as well as the impact of each component on the final result (i.e. the influence of spatial correction, optical filters and detectors). Original results of authors’ research have been presented and the concept for decreasing the measurement error has been proposed.
Źródło:
Optica Applicata; 2018, 48, 4; 697-704
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modelling of sound transmission through the window type partition
Autorzy:
Kwapisz, L.
Maurin, A.
Jakubowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/127902.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
sound transmission
acoustic insulation
window
numerical simulation
transmisja dźwięku
izolacja akustyczna
okno
symulacja numeryczna
Opis:
The approach to numerical modelling of sound transmission through window type partitions is investigated in the paper. The laboratory conditions of reverberation room are simulated. The numerical and experimental results are compared. The impact of different model parameters on the sound insulation levels are evaluated.
Źródło:
Vibrations in Physical Systems; 2016, 27; 211-218
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of fresh garlic (Allium sativum L.) juice on zebrafish (Danio rerio) embryos developmental effects
Autorzy:
Majewski, M.
Kasica, N.
Jakubowski, P.
Podlasz, P.
Powiązania:
https://bibliotekanauki.pl/articles/963946.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
A higher sensitivity and the cytotoxic effects of garlic have been previously reported on culture cells. No studies, however, have investigated the developmental toxicity of fresh garlic in zebrafish model. In this study freshly made garlic juice, which chemically is a combination of sulphur containing compounds, was evaluated to investigate the developmental toxicity during a 5-day assay using zebrafish embryos, starting from 2 h post fertilization. The results showed that toxicity endpoints such as the hatching rate, survival rate, malformation rate and growth rate had a significant dose-response relationship with increasing concentrations of garlic juice. The average hatching rate and time to hatch of zebrafish exposed to lower concentrations (0.001% and less) were significantly increased around 48-60 h of treatment (P < 0.05), strongly emphasizing the acceleration of hatchability caused by garlic juice. Mortality was also increased with exposure to garlic, exhibiting the maximal toxicity after 12 h of exposure to the concentration of 0.08%. A significant reduction in the heart rate by 35.5% was recorded due to the higher concentrations of juice (above 0.01%) starting form 36-hour exposure (P < 0.05). Growth retardation, pericardial oedema with heart malformations, deformity of yolk, lack of pigmentation and body malformation have been noticed at the concentration of 0.03% starting from 48 h of exposure. No severe malformations in any of the experimental zebrafish were produced at concentrations less than 0.01% of garlic juice. The results indicate that developing zebrafish are sensitive to garlic juice and further studies are required to investigate the molecular basis of the observed effects that garlic constituents exert upon aquatic vertebrates.
Źródło:
Journal of Elementology; 2017, 22, 2
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of fresh garlic (Allium sativum L.) juice on zebrafish (Danio rerio) embryos developmental effects
Autorzy:
Majewski, M.
Kasica, N.
Jakubowski, P.
Podlasz, P.
Powiązania:
https://bibliotekanauki.pl/articles/1190187.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
Danio rerio
developmental toxicity
fresh garlic juice
Opis:
A higher sensitivity and the cytotoxic effects of garlic have been previously reported on culture cells. No studies, however, have investigated the developmental toxicity of fresh garlic in zebrafish model. In this study freshly made garlic juice, which chemically is a combination of sulphur containing compounds, was evaluated to investigate the developmental toxicity during a 5-day assay using zebrafish embryos, starting from 2 h post fertilization. The results showed that toxicity endpoints such as the hatching rate, survival rate, malformation rate and growth rate had a significant dose-response relationship with increasing concentrations of garlic juice. The average hatching rate and time to hatch of zebrafish exposed to lower concentrations (0.001% and less) were significantly increased around 48-60 h of treatment (P < 0.05), strongly emphasizing the acceleration of hatchability caused by garlic juice. Mortality was also increased with exposure to garlic, exhibiting the maximal toxicity after 12 h of exposure to the concentration of 0.08%. A significant reduction in the heart rate by 35.5% was recorded due to the higher concentrations of juice (above 0.01%) starting form 36-hour exposure (P < 0.05). Growth retardation, pericardial oedema with heart malformations, deformity of yolk, lack of pigmentation and body malformation have been noticed at the concentration of 0.03% starting from 48 h of exposure. No severe malformations in any of the experimental zebrafish were produced at concentrations less than 0.01% of garlic juice. The results indicate that developing zebrafish are sensitive to garlic juice and further studies are required to investigate the molecular basis of the observed effects that garlic constituents exert upon aquatic vertebrates.
Źródło:
Journal of Elementology; 2017, 22, 2; 475-486
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fresh garlic juice versus aged garlic extract. Determination of lethal concentration (LC20 and LC50) values on zebrafish (Danio rerio) embryos and larvae
Autorzy:
Majewski, M.
Kasica, N.
Jakubowski, P.
Lepczyńska, M.
Powiązania:
https://bibliotekanauki.pl/articles/962692.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
Developmental abnormalities due to fresh garlic (Allium sativum L.) juice exposure have been previously reported on zebrafish (Danio rerio) embryos. Freshly made garlic juice (FGJ) containing allicin as a main ingredient and aged garlic extract (AGE) containing mainly S-allyl-L-cysteine were evaluated to investigate the lethality during a 5-day assay using zebrafish embryos, starting from 2 hours post fertilization (hpf), in a static system at an garlic concentration range of 0.00001-0.1%. In addition, lethality comparison between embryos and 3 days of post fertilization (dpf) larvae was performed. The results indicate that the mortality rate is positively correlated to the concentration of FGJ. Lethal concentration for the 24-h LC20 and 24-h LC50 in zebrafish embryos exposure was determined as 0.034% and 0.021%. The corresponding values for larval forms were significantly higher, 0.081% and 0.073% (P < 0.01), suggesting a greater sensitivity of developing embryos to FGJ treatment, as well as no protection from an embryo’s chorion. Below the FGJ concentrations of 0.02% (for embryos) and 0.06% (for larvae), no increase in mortality was observed over the entire exposure time. The mortality of AGE-treated embryos did not differ significantly (P = 0.571) from the control regardless of exposure duration and AGE concentration. The overall results indicate that zebrafish embryos constitute a reliable model for testing the developmental toxicity of garlic, and that different types of garlic preparations have different pharmacologic properties.
Źródło:
Journal of Elementology; 2017, 22, 4
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of temperature changes in thermophille phase of composting process in the aspect of sanitary condition of obtained material
Dynamika zmian temperatury fazy termofilnej procesu kompostowania w aspekcie stanu sanitarnego uzyskanego materiału
Autorzy:
Jakubowski, T.
Sołowiej, P.
Powiązania:
https://bibliotekanauki.pl/articles/93619.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
composting
poultry
temperature
hygienization
kompostowanie
drób
temperatura
higienizacja
Opis:
A condition of obtaining compost with proper sanitary parameters is achieving the organic recycling process temperature which exceeds 70ºC. The objective of the paper was to determine the temperature course in the compost tank for organic recycling of dead poultry in relation to the applied structure forming material. Wheat, oat, barley, rapeseed and corn straw were used as a structure-forming material. A measuring system was equipped with a probe with a temperature sensor with precision of ±0.15ºC, transducer and data recorder. Results were prepared with the use of the analysis of variance at the level of significance of α=0.05. Statistically significant differences of the temperature value in the thermophille phase of the composting process between combinations of the experiment were indicated. In all investigated combinations of the experiment, achievement (or exceeding) the temperature value of 70ºC of the compost mass was reported.
Warunkiem uzyskania kompostu o odpowiednich parametrach sanitarnych jest osiągnięcie w trakcie procesu recyklingu organicznego temperatury przekraczającej 70°C. Celem pracy było określenie przebiegu temperatury w skrzyni kompostowej przeznaczonej do organicznego recyklingu padłego drobiu w zależności od zastosowanego materiału strukturotwórczego. Jako materiał strukturotwórczy zastosowano słomę pszeniczną, jęczmienną, owsianą, rzepakową i kukurydzianą. W badaniach korzystano z układu pomiarowego wyposażonego w sondę z czujnikiem temperatury o dokładności ±0,15ºC, przetwornik i rejestrator danych. Wyniki opracowano z wykorzystaniem analizy wariancji na poziomie istotności α=0,05. Wykazano statystycznie istotne różnice wartości temperatury w fazie termofilnej procesu kompostowania między kombinacjami doświadczenia. We wszystkich badanych kombinacjach doświadczenia stwierdzono osiągnięcie (lub przekroczenie) wartości temperatury 70ºC masy kompostowej.
Źródło:
Agricultural Engineering; 2016, 20, 4; 69-75
2083-1587
Pojawia się w:
Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new tool for topological optimization of a rotor for vertical axis wind turbines
Autorzy:
Jakubowski, M.
Fritzkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/127945.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
vertical axis wind turbine
topological optimization
computational fluid dynamics
turbiny wiatrowe o pionowej osi obrotu
optymalizacja topologiczna
obliczeniowa dynamika płynów
Opis:
A computer program for topological optimization of a rotor for vertical axis wind turbines of various type is presented. The tool is based mainly on two external modules: the GMSH mesh generator and the OpenFOAM CFD toolbox. Interpolation of rotor blades geometry and computational model of the airflow through a turbine are briefly discussed. Moreover, a simple optimization algorithm is described. Exemplary results for a H-type rotor are presented. Finally, potential directions for the software development are indicated.
Źródło:
Vibrations in Physical Systems; 2016, 27; 143-150
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary analysis of two combustors turbofan engine
Autorzy:
Jakubowski, R.
Orkisz, M
Wygonik, P.
Powiązania:
https://bibliotekanauki.pl/articles/241925.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
jet engine
turbofan engine
Opis:
The problems of turbofan engines development is briefly discussed in the beginning. Next the conception of turbofan engine with two combustors is presented, and an engine thermodynamic cycle is analysed. The proposed engine it is a modification of the contemporary turbofan engine by addition of another combustor. First one is classical combustor located between high pressure compressor and turbine. Second one is located between high pressure turbine and low pressure turbine. This conception allows to lower the high pressure turbine inlet temperature. The second combustor increases energy of gasses inflow the low pressure turbine to the sufficient level for fan drive. The results of numerical analysis are used to show performance of the proposed engine and to present their advantages with compare to the classical turbofan engine construction. Then some other positive aspects of two combustors engine are discussed. It refers to possibilities of pollution emission reduction and overhauling period increasing and engine life time extension. On the other hand some aspects of engine hot elements (turbine) production simplification and cost reduction is analysed. In the next chapter the problems of the proposed engine technical realization are discussed. The summary and conclusions are presented in the last part of article.
Źródło:
Journal of KONES; 2013, 20, 2; 175-180
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method for assessment of changes in the width of cracks in cement composites with use of computer image processing and analysis
Autorzy:
Tomczak, K.
Jakubowski, J.
Fiołek, P.
Powiązania:
https://bibliotekanauki.pl/articles/178219.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
cracks in concrete
crack width measurement
image processing
self-healing
Opis:
Crack width measurement is an important element of research on the progress of self-healing cement composites. Due to the nature of this research, the method of measuring the width of cracks and their changes over time must meet specific requirements. The article presents a novel method of measuring crack width based on images from a scanner with an optical resolution of 6400 dpi, subject to initial image processing in the ImageJ development environment and further processing and analysis of results. After registering a series of images of the cracks at different times using SIFT conversion (Scale-Invariant Feature Transform), a dense network of line segments is created in all images, intersecting the cracks perpendicular to the local axes. Along these line segments, brightness profiles are extracted, which are the basis for determination of crack width. The distribution and rotation of the line of intersection in a regular layout, automation of transformations, management of images and profiles of brightness, and data analysis to determine the width of cracks and their changes over time are made automatically by own code in the ImageJ and VBA environment. The article describes the method, tests on its properties, sources of measurement uncertainty. It also presents an example of application of the method in research on autogenous self-healing of concrete, specifically the ability to reduce a sample crack width and its full closure within 28 days of the self-healing process.
Źródło:
Studia Geotechnica et Mechanica; 2017, 39, 2; 73-80
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Code calculations for local stability of shaft guides
Autorzy:
Fiołek, P.
Jakubowski, J.
Tomczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/178575.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
shaft steelwork
corrosion loss
local buckling
steel profile
FEM simulation
Opis:
Steel structures for a conveyance guiding system are subjected to prolonged, intense corrosion during their operation leading to a considerable loss of material and structure capacity reduction. Shaft guides are made of closed profiles welded from hotrolled channel sections. These profiles are categorized as class 1 cross-sections according to Eurocode 3, which means that they are resistant to local instability upon bending [1]. With an increase in the corrosion loss of the guides, the inertia moment of the crosssection is reduced. The resistance of profiles to local buckling is also reduced. However, calculations for local stability in guides upon bending are not required by the local Polish regulations on the operation of conveyance in shafts [2]. The question is whether this constitutes a shortcoming and risk for safe operation. Calculations according to steel construction standards [1] supported by numerical simulation were used to evaluate shaft steelwork guides resistance to buckling and their sensitivity to corrosion loss. It was shown that the guides of corrosion loss of 52-63%, depending on profile size, are prone to local buckling.
Źródło:
Studia Geotechnica et Mechanica; 2017, 39, 3; 11-16
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Notification methods in wireless systems
Autorzy:
Nawrocki, P.
Jakubowski, M.
Godzik, T.
Powiązania:
https://bibliotekanauki.pl/articles/305806.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
notification methods
wireless systems
energy consumption
Opis:
Recently, there has been an increasing need for secure, efficient, and simple notification methods for wireless systems. Such systems are meant to provide users with precise tools best suited for work or leisure environments, and a lot of effort has been put into creating a multitude of applications. At the same time, however, not much research has been made into determining which of the available protocols are best suited for each individual task. A number of basic notification methods are presented here, and tests have been performed for the most-promising ones. An attempt has been made to determine which of the methods have the best throughput, latency, security, and other characteristics. A comprehensive comparison is provided, which can be used to select the right method for each individual project. Finally, conclusions are provided, and the results from all of the tests conducted are discussed.
Źródło:
Computer Science; 2016, 17 (4); 519-539
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DLC coating doped by specified elements as a biomaterial designed for individual patient needs
Autorzy:
Bociąga, D.
Szymański, W.
Jakubowski, W.
Komorowski, P.
Niedzielski, P.
Powiązania:
https://bibliotekanauki.pl/articles/284956.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
carbon coating
doped DLC
biomaterial
biocompatibility
implant
Opis:
Currently, there are more and more new materials (nanomaterials) proposed for biological and medical applications. They are, among other things, the effect of surface modification. One of the most frequently used techniques, fairly widespread, is plasmo-chemical method of diamond-like carbon (DLC) coating fabrication. There is many alterations of them, nevertheless all are characterized by short duration of the process and its economics. The final result does not require additional finishing treatments and the required coating properties can be controlled and obtained by selecting appropriate process parameters. Good mechanical and tribological properties, high corrosion resistance and its tolerance by biological systems have been documented in the literature. However, given the very wide range of applications of biomaterials found over time that the properties of carbon coatings are not always sufficient. The research conducting by scientific centres around the world have shown, however, that surface properties can be controlled by introducing specified elements into the DLC layer. Each of these added elements causes some properties change. Taking into consideration that we are dealing with biomaterials – the materials which are used in very harsh and demanding environment of a living organism, which also have a strong intra-individual variability, the solution in the form of material designed adequately to the needs of the individual patient is even more attractive and desirable. The DLC coatings doped by silver fulfilling constitute an innovative materials for biomedical application and are the subject of our investigations.
Źródło:
Engineering of Biomaterials; 2013, 16, no. 122-123 spec. iss.; 8-9
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bactericidal TiO2 layers doped with Cu, Zn, and ZnO
Autorzy:
Jakubowski, W.
Frankowski, P.
Jastrzębska, A.
Celigowska, A.
Frąckiewicz, P.
Walkowiak, B.
Powiązania:
https://bibliotekanauki.pl/articles/284240.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
chemical antimicrobial substances
bacterial biofilms
antibiotics
Źródło:
Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 30
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational studies of TTR related amyloidosis: exploration of conformational space through petri net-based algorithm
Autorzy:
Jakubowski, R.
Gogolińska, A.
Pepłowski, Ł.
Skrzyniarz, P.
Nowak, W.
Powiązania:
https://bibliotekanauki.pl/articles/1954249.pdf
Data publikacji:
2022-02-01
Wydawca:
Politechnika Gdańska
Tematy:
transthyretin amyloidosis
molecular dynamics
Petri nets
clustering
conformational space
graphs
dynamika molekularna
sieci Petriego grupowanie
konformacyjne miejsca
wykresy
Opis:
Amyloidosis, a serious and widespread disease with a genetic background , manifests itself through the formation of dangerous fibrils in various organs. Apart from the polluted environment and an unhealthy lifestyle, genetic factors may accelerate this process leading in some cases to lethal damages to the body. Recently, a growing interest in amyloidogenic protein research has been observed. Transthyretin (TTR) is a tetrameric protein that transports thyroid hormone thyroxine and retinol binding protein in plasma and the cerebral fluid. Sometimes TTR breaks apart and forms fibrils. Several single point mutations, having de stabilizing impact on the TTR complex, are involved in the amyloidogenic TTR cascade. Problems with the TTR tetramer stability and conformational space characteristics of the protein have not been addressed computationally before. We present selected results of our molecular dynamics (MD, ∼ 2000ns) and steered MD simulations ( SMD ) of three variants of TTR : Wild Type ( WT ), V 30 M and L 55 P . SMD has been used to enforce the dissociation of TTR . Conformational spaces of WT TTR and its amyloidogenic variants have been investigated using a novel “ One Place One Conformation ” ( OPOC ) algorithm based on a graph technique called Petrinet (PN) formalism. While the PN approach alone does not permit a direct identification of protein regions with reduced stability, it gives quite a useful tool for an effective compari son of complex protein energy landscapes explored during classical and/or SMD steered molecular dynamics simulations.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2014, 18, 3; 289--300
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composition and electrical properties of ultra-thin SiOxNy layers formed by rf plasma nitrogen implantation/plasma oxidation processes
Autorzy:
Bieniek, T.
Beck, R. B.
Jakubowski, A.
Konarski, P.
Ćwil, M.
Hoffman, P.
Schmeißer, D.
Powiązania:
https://bibliotekanauki.pl/articles/308689.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
CMOS
gate stack
oxynitride
plasma implantation
Opis:
Experiments presented in this work are a summary of the study that examines the possibility of fabrication of oxynitride layers for Si structures by nitrogen implantation from rf plasma only or nitrogen implantation from rf plasma followed immediately by plasma oxidation process. The obtained layers were characterized by means of: ellipsometry, XPS and ULE-SIMS. The results of electrical characterization of NMOS Al-gate test structures fabricated with the investigated layers used as gate dielectric, are also discussed.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 3; 9-15
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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