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Wyświetlanie 1-15 z 142
Tytuł:
Analysis of changes in electromyographic masticatory muscle activity in relation to the selected correction of refractive error
Autorzy:
Zieliński, G.
Baszczowski, M.
Ginszt, M.
Rapa, M.
Matysik-Woźniak, A.
Szkutnik, J.
Rejdak, R.
Gawda, P.
Powiązania:
https://bibliotekanauki.pl/articles/28761747.pdf
Data publikacji:
2022
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2022, 29, 3; 457-462
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thuja ×soeegaardii (Cupressaceae) – a new name for an old hybrid
Autorzy:
Kosinski, P.
Tomaszewski, D.
Zielinski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2130188.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Thuja ‘Green Giant’
Horsholm Arboretum
Bent Søegaard
allopatric hybridization
Opis:
Thuja ×soeegaardii, a hybrid of Th. plicata Donn ex D.Don and Th. standishii (Gordon) Carrière, is described as a new nothospecies from the Kórnik Arboretum, Poland, based on plants obtained in 1988 from the Botanical Garden in Gothenburg, Sweden. The hybrid was found for the first time at the Hørsholm Arboretum, Denmark, in 1938, among seedlings grown from seeds collected from Thuja standishii. Plants grown from rooted scions of this hybrid were planted in several places within the Hørsholm Arboretum. Soon, the hybrid plants were gifted to the Botanical Gardens in Copenhagen and Gothenburg as well to the Poulsen’s Plant Nursery in Kvistgård. In 1967 seedlings were sent from Kvistgård to the National Arboretum in Washington, where one of them developed into a particularly showy, lush and vigorous plant characterized by a dense, narrow, conical crown. The offspring obtained from rooted scions turned out to be very drought and wind-resistant, especially suitable for the formation of tall hedges and windbreak screens. This plant, now very widespread in cultivation, especially in the United States, goes by the name of Thuja ‘Green Giant’. In terms of morphology, many features of Th. ×soeegaardii are intermediate as compared to the parent species. From the Th. plicata, it differs by the following characteristics: leaves not or only weakly shining above, lateral leaves with inwardly curved (not straight) apices, the apical part of lower central leaves thickened and slightly bent from the stem (not appressed), glands on central leaves only weakly visible, central leaves of primary shoots acuminate (not long acuminate) and seed wings sparsely papillose in the upper part (only rarely smooth). From Th. standishii, it can be distinguished by the less glaucous upper leaf surface, the less protruding apical part of lower central leaves, at least faintly visible glands on central leaves, acuminate (not acute) central leaves of primary shoots and less distinctly papillose upper part of seed wings.
Źródło:
Dendrobiology; 2022, 87; 113-121
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Altered squat movement pattern in patients with chronic low back pain
Autorzy:
Zawadka, M.
Smołka, J.
Skublewska-Paszkowska, M.
Łukasik, E.
Zieliński, G.
Byś, A.
Gawda, P.
Powiązania:
https://bibliotekanauki.pl/articles/28762846.pdf
Data publikacji:
2021
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2021, 28, 1; 158-162
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fast one-cycle frequency estimation of a single sinusoid in noise using downsampled linear prediction model
Autorzy:
Duda, Krzysztof
Zieliński, Tomasz P.
Powiązania:
https://bibliotekanauki.pl/articles/2052172.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
frequency estimation
linear prediction
Prony method
smart DFT
Opis:
A new solution to the problem of frequency estimation of a single sinusoid embedded in the white Gaussian noise is presented. It exploits, approximately, only one signal cycle, and is based on the well-known 2nd order autoregressive difference equation into which a downsampling is introduced. The proposed method is a generalization of the linear prediction based Prony method for the case of a single undamped sinusoid. It is shown that, thanks to the proposed downsampling in the linear prediction signal model, the overall variance of the least squares solution of frequency estimation is decreased, when compared to the Prony method, and locally it is even close to the Cramér-Rao Lower Bound, which is a significant improvement. The frequency estimation variance of the proposed solution is comparable with, computationally more complex, the Matrix Pencil and the Steiglitz-McBride methods. It is shown that application of the proposed downsampling to the popular smart DFT frequency estimation method also significantly reduces the method variance and makes it even better than the least squares smart DFT. The noise immunity of the proposed solution is achieved simultaneously with the reduction of computational complexity at the cost of narrowing the range of measured frequencies, i.e. a sinusoidal signal must be sufficiently oversampled to apply the proposed downsampling in the autoregressive model. The case of 64 samples per period with downsampling up to 16, i.e. 1/4th of the cycle, is presented in detail, but other sampling scenarios, from 16 to 512 samples per period, are considered as well.
Źródło:
Metrology and Measurement Systems; 2021, 28, 4; 661-672
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of regular climbing on depression, generalized anxiety and lower back pain
Autorzy:
Zieliński, G.
Zięba, E.
Wilkowicz, W.
Byś, A.
Ginszt, M.
Libera, O.
Zawadka, M.
Saran, T.
Gawda, P.
Powiązania:
https://bibliotekanauki.pl/articles/28762737.pdf
Data publikacji:
2021
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2021, 28, 3; 463-468
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of chemical compounds contained in a diet on the development and prevention of urolithiasis
Autorzy:
Zielinski, P.
Krupinska, J.
Wrobel, G.
Powiązania:
https://bibliotekanauki.pl/articles/1192790.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
urolithiasis
chemical factors
nutrition
diet
Opis:
Urolithiasis is one of the most common diseases of the genitourinary system. The conditions associated with the development of urolithiasis show a wide variety, among which dietary behaviour is of great importance and is nowadays becoming increasingly important in the development of kidney stones. The aim of this study was to review the literature about the impact of chemical compounds contained in a diet on the development and prevention of urolithiasis. Factors impeding the proper absorption of calcium include phosphates, fatty acids, sulphates, citrates, oxalates, while the factor that stimulates the absorption of calcium in the intestines is the active form of vitamin D3. In this regard, one should consider the amount of calcium, sodium, potassium, animal protein and simple carbohydrates consumed in a diet, as well as dietary habits regarding caffeine and alcohol. Also significant is the fact that a poorly balanced diet may condition hypercalciuria. In the case of excessive consumption of other compounds, such as simple carbohydrates and ethyl alcohol, increased urinary calcium excretion is observed, caused by disturbances in the tubular reabsorption of calcium and magnesium in nephrons. Nowadays, prophylaxis is gaining importance in the light of the growing number of cases of urolithiasis worldwide. A well-designed diet is a crucial element, affecting both the formation of deposits and treatment, hence sound knowledge of the principles of proper nutrition can significantly reduce the risk of the recurrence of renal colic. The most common cause of urolithiasis are nutritional errors, and the onset of treatment is associated with a change in dietary habits. The general nutritional recommendations for urolithiasis should be adapted to the type of urinary stones deposit and an individual patient’s comorbidities. A tailored approach to combating the disease is required.
Źródło:
Journal of Elementology; 2021, 26, 1; 163-179
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asbestosis hospitalizations in Poland (2006–2016): results from the National Hospital Discharge Registry
Autorzy:
Kanecki, K.
Kosińska, I.
Tyszko, P.Z.
Nitsch-Osuch, A.
Goryński, P.
Zieliński, G.
Powiązania:
https://bibliotekanauki.pl/articles/2085542.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
public health
environmental health
lung disease
occupational exposure
Opis:
Introduction and objective. Occupational asbestos exposure is one of the major public health issues. Although asbestos use in Poland has decreased, asbestosis continues to remain an important health concern in the area of occupational medicine. The aim of the study is to perform a descriptive analysis of hospitalization cases in patients suffering from asbestosis in Poland. Materials and method. The authors used hospital discharge records to conduct a retrospective, population-based study. To estimate the asbestosis hospitalization rate, data from the Nationwide General Hospital Morbidity Study conducted by the National Institute of Public Health were used. Events were defined as in-patient hospital discharges during 2006–2016. 1,101 hospitalization records of 764 patients were included in the study. Results. In the study group of first-time hospitalized patients, the mean and median ages were 68.1 and 69 years, respectively; CI: 67.3–68.9; SD: 11.1, min-max:16–99 years. In this group, significant gender differences were observed (560 males vs. 204 female; P<0.001). No statistical differences were observed regarding the place of residence. During the observation period, 61 in-hospital deaths were reported (8% of all patients), 40 of whom (5.2 % of all patients) took place during the first-time hospitalizations. Asbestosis hospitalizations were mainly clustered in the south-western region, whereas the highest hospitalization rates were clustered in several areas of Poland. Conclusions. The authors believe this study to be the first evaluation of asbestosis in Poland made on the basis of the hospital morbidity database. The data presented may be helpful in comparative studies on the epidemiology of asbestosis across European countries.
Źródło:
Annals of Agricultural and Environmental Medicine; 2020, 27, 2; 284-289
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the impact of sodium and potassium metabolism in women undergoing hysteroscopy due to pathological uterine bleeding
Autorzy:
Zielinski, P.
Szeszko, L.
Krupinska, J.
Wrobel, G.
Szeszko, A.
Oszukowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1192474.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
gynaecology
menstruation
menstrual disorders
abnormal uterine bleeding
kalium
natrium
endomentrial hyperplasia
endometrial polyp
heavy menstruation
uterine fibroids
Opis:
Monitoring the water and electrolyte balance is an integral part of diagnostics and designing an effective therapy of many diseases. Sodium and potassium play a crucial role in the diagnosis of water and electrolyte disorders. The study was conducted to demonstrate the relationship between the occurrence of electrolyte disturbances in women undergoing hysteroscopy due to pathological uterine bleeding. Medical records of 543 patients aged 21-88 (52.8±11.8 years) hospitalized in the Gynecology and Obstetrics Department of the Provincial Specialist Hospital in Biała Podlaska, who underwent hysteroscopic diagnostics due to pathological bleeding from the uterus were collected. 212 women (39.04%) were diagnosed with pathological bleeding from the uterus, 147 women (27.07%) had endomentrial hyperplasia, 104 women (19.15%) were diagnosed with an endometrial polyp, 62 women (11.42%) suffered from heavy menstruations and 18 women (3.3%) had uterine fibroids. The sodium and potassium concentrations were measured using an automated Cobas® 8000 analyzer (Roche). The average concentration of sodium in the serum was 139.84±2.13 mmol L-1 (χ 2 = 35.079; P<0.001), and the average potassium concentration was 4.44±0.37 mmol L-1 (χ 2 = 36.019; P<0.001). Higher values for sodium were recorded in the group of patients with adenomyosis (140.41±2.27 mmol L-1) and patients with uterine fibroids (140.11±1.94) mmol L-1). Statistically significant differences were found in mean sodium concentration values depending on the causes of patients’ hospitalization (H=33.914; P<0.001), and the biggest differences were between patients with ovulation disorders and patients with adenomyosis: 138.86±0.21 mmol L-1 vs. 140.41±2.27 mmol L-1 (Z=5.169; P<0.001). It seems important add measurements of sodium and potassium concentrations to the profile of tests performed in the diagnosis of gynaecological patients referred for hysteroscopy for the reasons presented in the study in order to reduce the risk of complications associated with the loss of these elements.
Źródło:
Journal of Elementology; 2020, 25, 3; 1199-1212
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changing Arctic. Firm scientific evidence versus public interest in the issue. Where is the gap?
Autorzy:
Pakszys, P.
Zielinski, T.
Ferrero, L.
Kotynska-Zielinska, I.
Wichorowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2079054.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Arctic
climate change
biomass burning
atmospheric pollution
radiation
climate warming
scientific research
Opis:
The authors provide hard evidence for a significant environmental impact of long-distance atmospheric pollution advection to the Arctic. Results from literature and of their research show that the atmospheric inflow of pollution to the Arctic has been increasing over the decades. The authors show evidence that biomass burning has a greater potential impact on radiative budget of the region than the well-known spring Arctic Haze phenomenon, which has always been regarded as the most prominent atmospheric pollution manifestation in the Arctic. Warming, which is observed in the Arctic, results in decreasing ice coverage of the region, which in turn, leads to the major changes in the ecosystem, hence affects human well-being. At the same time, the authors present results of two independent studies, dedicated to the recognition of the awareness and the level of interest of people in eight Arctic countries and among young learners in Poland. The results show that not only the level of public interest is low, but it is both decreasing or, at the best, low to societies. This is in strong contradiction to information available and the daily experience of the societies, which inhabit the region. The authors believe, that such contradiction results from a low level of knowledge and interest of the Arctic and the climate change itself. Finally, the authors provide some hints on how to link hard scientific evidence for Arctic environmental changes with proper communication to the general public, and hence to increase the level of interest among citizens.
Źródło:
Oceanologia; 2020, 62, 4PB; 593-602
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion and thermal shock resistance of metal (Cu, Al) matrix composites reinforced by SiC particles
Autorzy:
Strojny-Nędza, A.
Egizabal, P.
Pietrzak, K.
Zieliński, R.
Kaszyca, K.
Piątkowska, A.
Chmielewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/200646.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal-matrix composites
silicon carbide
wear resistance
corrosion
thermal shocks
Opis:
This paper presents the results of studies concerning the production and characterization of Al-SiC/W and Cu-SiC/W composite materials with a 30% volume fraction of reinforcing phase particles as well as the influence of corrosion and thermal shocks on the properties of selected metal matrix composites. Spark plasma sintering method (SPS) was applied for the purpose of producing these materials. In order to avoid the decomposition of SiC surface, SiC powder was coated with a thin tungsten layer using plasma vapour deposition (PVD) method. The obtained results were analysed by the effect of the corrosion and thermal shocks on materials density, hardness, bending strength, tribological and thermal properties. Qualitative X-ray analysis and observation of microstructure of sample surfaces after corrosion tests and thermal shocks were also conducted. The use of PVD technique allows us to obtain an evenly distributed layer of titanium with a constant thickness of 1.5 µm. It was found that adverse environmental conditions and increased temperature result in a change in the material behaviour in wear tests.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1227-1236
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indirect tensile test as a simple method for rut resistance evaluation of asphalt concrete
Badanie wytrzymałości na rozciąganie pośrednie jako prosta metoda oceny odporności na koleinowanie dla betonu asfaltowego
Autorzy:
Zieliński, P.
Powiązania:
https://bibliotekanauki.pl/articles/230994.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
belka dwuprzęsłowa
uszkodzenie
ścinanie
pękanie
ugięcie
beton zbrojony włóknami
włókno stalowe
włókno bazaltowe
two-span beam
shear failure
cracking
deflection
fiber reinforced concrete
steel fiber
basalt fiber
Opis:
The paper presents the dependence of ITS results at the elevated temperature (40°C) on rutting parameters, i.e. proportional rut depth (PRDAIR) and wheel tracking speed (WTSAIR), obtained at the temperature of 60°C. The asphalt mixture samples were prepared in the gyratory compactor, but ITS tests were conducted with typical Marshall press, at a loading rate of 50 mm/min. Correlation analyses show a strong relationships between ITS results and rutting parameters, whereby the correlation coefficients obtained are higher for the PRDAIR parameter (r = -0.88) than WTSAIR (r = -0.81). Using the obtained regression functions, the prediction limits as well as confidence limits were calculated, which allowed to develop criteria for assessing resistance to rutting on the basis of ITS test, and taking into account the technical requirements in Poland.
Odporność mieszanek mineralno-asfaltowych (MMA) na powstawanie deformacji trwałych jest jednym z podstawowych wymagań, które należy zapewnić podczas projektowania składu mieszanki. Najczęściej stosuje się do tego celu badania koleinowania na laboratoryjnie zagęszczanych próbkach MMA, co wymaga stosunkowo dużych próbek oraz użycia specjalistycznej aparatury, zarówno do zagęszczenia takich próbek jak i samego ich badania. W związku z powyższym, w wielu krajach prowadzone są badania celem wytypowania prostego testu, który można wykonać z wykorzystaniem powszechnie dostępnych w laboratoriach drogowych urządzeń (np. prasa Marshalla), na standardowo przygotowywanych próbkach MMA. Zgodnie z wynikami prac prowadzonych przez Christensena i Bonaquista, Zaniewskiego i Srinivasana jak również Khousla i Harikrishnanna takim badaniem może być wytrzymałość na rozciąganie pośrednie (ITS), przy odpowiednim dostosowaniu temperatury badania jak również szybkości przesuwu tłoka w prasie. Dla celów praktycznych rekomendowane jest użycie standardowej prasy Marshalla o prędkości przesuwu tłoka 50 mm/minutę, przy temperaturze badania równej 40°C. W niniejszej publikacji przedstawiono badania zależności pomiędzy wynikami ITS, przeprowadzonego wg wyżej wymienionych warunków, oraz parametrami koleinowania w małym koleinomierzu w 60°C, tj. proporcjonalną głębokością koleiny (PRDAIR) i szybkością przyrostu koleiny (WTSAIR). Do badania wytrzymałości na rozciąganie pośrednie przeznaczono próbki o średnicy 100 mm zagęszczone w prasie żyratorowej, natomiast do badania koleinowania przygotowano płyty o wymiarach 305 x 305 mm i wysokości 40 mm lub 60 mm, zależnie od uziarnienia badanej MMA. Przebadano łącznie 21 mieszanek betonu asfaltowego przeznaczonego do warstw podbudowy, wiążącej i ścieralnej o uziarnieniach 0/22 mm, 0/16 mm i 0/8 mm. W mieszankach tych stosowano różne asfalty tj.: drogowe niemodyfikowane (35/50 i 50/70), modyfikowane polimerami (PMB 25/55-60, PMB 45/80-55), modyfikowane gumą (wg rozwiązań patentowych). Dodatkowo w niektórych mieszankach stosowano dodatek granulatu asfaltowego (RAP) lub granulatu papy (RAS). Uzyskane wartości średnie dla poszczególnych MMA, dotyczące: ITS, parametrów koleinowania (PRD i WTS), parametrów składu MMA takich jak zawartość lepiszcza, wolne przestrzenie w MMA, wolne przestrzenie w mieszance mineralnej (VMA) oraz wypełnienie wolnych przestrzeni w mieszance mineralnej przez asfalt (VFB), zostały poddane analizom korelacji liniowej.
Źródło:
Archives of Civil Engineering; 2019, 65, 3; 31-43
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of metrological properties fiber Bragg gratings with a constant and variable period
Analiza właściwości metrologicznych siatek Bragga ze stałym i zmiennym okresem
Autorzy:
Zieliński, T.
Kisała, P.
Powiązania:
https://bibliotekanauki.pl/articles/408901.pdf
Data publikacji:
2018
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
fiber Bragg grating (FBG)
optical sensor
uniform fiber Bragg grating
chirped fiber Bragg grating
światłowodowa siatka Bragga
czujnik optyczny
jednorodna światłowodowa siatka Bragga
chirpowa światłowodowa siatka Bragga
Opis:
The paper presents periodic structures in terms of metrological properties in the distinction for a fiber Bragg grating (FBG) with a constant and changeable period. The process of their formation and characteristics as well as applications in many areas have been described. On the basis of the literature, the results of research and measurements of measurable quantities such as temperature and stress made by periodic structures applied to the fiber of the optical fiber are presented. Analysis of the presented measurements allowed to mark the ranges and accuracy of measurements of individual applications.
W pracy przedstawiono struktury periodyczne pod kątem własności metrologicznych w rozróżnieniu na światłowodowe siatki Bragga (FBG – ang.: Fiber Bragg Grating) o stałym i zmiennym okresie. Opisano proces ich powstawania oraz cechy charakterystyczne jak i zastosowania w wielu dziedzinach. W oparciu o literaturę zaprezentowano wyniki badań i pomiarów takich wielkości mierzalnych jak temperatura i naprężenie dokonywanych strukturami periodycznymi naniesionymi na włókno światłowodu. Analiza zaprezentowanych pomiarów pozwoliła nakreślić zakresy oraz dokładności pomiarów poszczególnych aplikacji.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2018, 8, 2; 62-67
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of an Innovative Ultrasound Disintegrator for Sewage Sludge Conditioning Before Methane Fermentation
Autorzy:
Zieliński, M.
Dębowski, M.
Krzemieniewski, M.
Rusanowska, P.
Zielińska, M.
Cydzik-Kwiatkowska, A.
Głowacka-Gil, A.
Powiązania:
https://bibliotekanauki.pl/articles/124268.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
sewage sludge
ultrasound disintegrator
methane fermentation
biogas
Opis:
Ultrasonic disintegration is one of the most interesting technologies among all known and described technologies for sewage sludge pre-treatment before the process of methane fermentation. This study was aimed at determining the effects of an innovative ultrasonic string disintegrator used for sewage sludge pre-treatment on the effectiveness of methane fermentation process. In this experiment, we used a device for disintegration of organic substrates, including sewage sludge, with the use ultrasonic waves. Its technical solution is protected by a patent no. P. 391477 – Device for destruction of tissue and cell structures of organic substrate. The volume of biogas produced ranged from 0.194±0.089 dm3/g o.d.m. at loading of 5.0 g o.d.m./dm3 and power of 50 W to 0.315±0.087 dm3/g o.d.m. at loading of 4.0 g o.d.m./dm3 and ultrasounds power of 125 W. The study demonstrated a positive effect of sewage sludge sonication on the percentage content of methane in biogas. Sewage sludge exposure to 125 W ultrasounds increased methane content in biogas to 68.3±2.5 % at tank loading of 3.0 g o.d.m./dm3.
Źródło:
Journal of Ecological Engineering; 2018, 19, 5; 240-247
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Rapid Prototyping technology in the manufacturing of turbine blade with small diameter holes
Autorzy:
Deja, M.
Dobrzyński, M.
Flaszyński, P.
Haras, J.
Zieliński, D.
Powiązania:
https://bibliotekanauki.pl/articles/259963.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
turbine blade
small diameter holes
Rapid Prototyping/Rapid Manufacturing
Direct Metal Laser Sintering (DMLS) technology
Opis:
The article presents the possibilities++ of using Rapid Prototyping (RP) technology in the manufacturing of turbine blades with small diameter holes. The object under investigation was gas turbine blade with small diameter cooling holes and holes for generating longitudinal vortices. A turbine blade model was produced by means of Direct Metal Laser Sintering (DMLS) technology and subsequently validated in terms of detection and accuracy of the obtained holes. The application of the computer tomography and digital radiography technique resulted in obtaining a series of cross-sections of the turbine blade model with a series of holes. Particular attention was pointed out at the investigation of the locations of micro-holes with a diameter of 0.3 mm. It turned out that it was impossible to make such small holes by the RP method. In the following part the results of the study on the possibilities of making the micro-holes using electrical discharge method have been presented. In addition, proposition of further works such as the development of the considerations and issues discussed in this article, has been offered.
Źródło:
Polish Maritime Research; 2018, S 1; 119-123
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 142

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