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    Wyświetlanie 1-13 z 13
    Tytuł:
    Ocena wpływu domieszek i dodatków na właściwości matrycy cementowej
    The assessment of impact of admixtures and additives on the properties of cement matrix
    Autorzy:
    Rucińska, T.
    Gul, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/162710.pdf
    Data publikacji:
    2017
    Wydawca:
    Polski Związek Inżynierów i Techników Budownictwa
    Tematy:
    matryca cementowa
    właściwości fizyczne
    zaczyn cementowy
    domieszka
    dodatek
    ocena wpływu
    cement matrix
    physical characteristics
    cement paste
    admixture
    additive
    impact assessment
    Opis:
    W artykule przedstawiono rezultat badań pozwalających ocenić właściwości matrycy cementowej z udziałem dodatków i domieszek. Do tego celu wykorzystano popiół lotny, pył krzemowo-wapienny (CaSi), superplastyfikator i domieszkę napowietrzającą. Zakres badań obejmował podstawowe badania cementu, takie jak normowa konsystencja i czas wiązania, a także stwardniałego zaczynu w zakresie rozwoju wytrzymałości w czasie dojrzewania do 56 dni oraz skurczu przy wysychaniu w niekorzystnych warunkach wilgotności względnej otoczenia RH=(50±5)%. Dozując do zaczynu cementowego domieszki i dodatki w zróżnicowanej ilości, wskazano na zmiany we właściwości matrycy cementowej wynikające z tego faktu.
    The article presents the result of research which makes it possible to assess the properties of the cement matrix containing additives and admixtures. For this purpose, the researchers used volatile ashes, silicon-and-calcium dust (CaSi), liquifying admixture as well as aerating admixture. The scope of research covered basic cement tests, such as norm consistency and time of setting and of hardened slurry in the scope of development of strength in the maturing time of up to 56 days as well as shrinkage during drying in unfavourable conditions of relative humidity of the surroundings RH=(50±5)%. By dosing admixtures and additives to the cement slurry in various quantities, changes have been pointed out regarding properties of the cement matrix resulting from this fact.
    Źródło:
    Przegląd Budowlany; 2017, 88, 7-8; 50-55
    0033-2038
    Pojawia się w:
    Przegląd Budowlany
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przestrzenna rekonstrukcja zabytkowego obiektu
    Autorzy:
    Gul, M.
    Tokarczyk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/130616.pdf
    Data publikacji:
    1999
    Wydawca:
    Stowarzyszenie Geodetów Polskich
    Tematy:
    pomiar fotogrametryczny
    obiekt zabytkowy
    Cmentarz Rakowicki
    photogrammetric measurement
    historic building
    Rakowice Cemetery
    Opis:
    W artykule opisano pomiar fotogrametryczny i opracowanie jego wyników mające na celu otrzymanie pełnego trójwymiarowego komputerowego modelu zabytkowego grobowca znajdującego się na Cmentarzu Rakowickim w Krakowie. Do utworzenia rysunku wektorowego posłużyły zeskanowane zdjęcia wykonane kamerą Rolleiflex 6006 metric i opracowane na cyfrowym autografie ekranowym VSD-AGH. Trójwymiarowy model komputerowy pokryto przetworzonymi zdjęciami z aparatu cyfrowego Minolta RD 175 wykorzystując oprogramowanie MicroStation 95. Model ten wraz z ortofotomapą fragmentu cmentarza i opisem słownym według standardów konserwatorskich stanowić może bazę danych systemu informacji o obiekcie.
    Źródło:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji; 1999, 9; 173-181
    2083-2214
    2391-9477
    Pojawia się w:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coaxial Circular Jet Flows with Conical Attachments
    Autorzy:
    Inan, A.
    Gul, M.
    Isikan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401427.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.27.wg
    47.80.Cb
    Opis:
    This study is devoted to experiments on jet flows, which have many application areas. It shows the obtained jet flow structure. The experiments were carried out in a subsonic sucking wind tunnel having cross-section of 32×32 cm², length of 75 cm, and turbulence densities of 0.5%. One-channel hot-wire anemometer (HWA) was used in measurements. For circular jet, a steel pipe was used with a length of 120 cm and a diameter of 8 mm. Air generator was used for generating air into the jet flow and measurements were done at different jet flow velocities. Moreover, a conical diffuser with a length of 21 cm and 6° slope was attached to the nozzle exit and effect of this diffuser on jet flow was examined. Seven types of measurement in three different categories were carried out. In experimental studies, velocity and turbulence distribution, axial velocity variation, jet half widths and, using these, jet diffusion rates and angles were measured. Moreover, flow analyses were done by drawing moment and frequency distribution for measurement sensitivity. These experimental results were compared with the studies on jet flow.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1373-1379
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Computational Study on (E)-3-(2-Chlorostyryl)-5,5-Dimethylcyclohex-2-Enone
    Autorzy:
    Eryilmaz, S.
    Gül, M.
    Kozak, Z.
    İnkaya, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031251.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.E
    31.15.es
    Opis:
    A new isophorone derivative, (E)-3-(2-chlorostyryl)-5,5-dimethylcyclohex-2-enone, was synthesized by aldol reactions and characterized by single crystal diffraction method to determine the molecular structure. The computational analysis based on density functional theory with Becke's three-parameter hybrid functional was carried out using Lee, Yang and Parr correlation functional (B3LYP)/6-311++G(d,p), to investigate the structural parameters, the values of dipole moment, the total polarizability, the first-order hyperpolarizability for the non-linear optical behaviour and the thermodynamic parameters at different temperatures of the compound.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 738-741
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Darcy-Forchheimer 3D Williamson nanofluid flow with generalized Fourier and Fick’s laws in a stratified medium
    Autorzy:
    Ramzan, M.
    Gul, H.
    Zahri, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/199972.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Generalized Fourier and Fick’s laws
    Darcy-Forchheimer porous medium
    Thermal and solutal stratification
    Williamson nanofluid
    Opis:
    Mathematical analysis for 3D Williamson nanofluid flow past a bi-directional stretched surface in Darcy-Forchheimer permeable media constitutes the focus of this study. The novelty of the proposed model is augmented by the addition of thermal and solutal stratification with chemical species and variable thermal conductivity. Calculations of the suggested model are conducted via the renowned homotopy analysis method (HAM). The results obtained are validated by comparing them in a limiting form with an already published article. Excellent harmony is achieved in this regard. Graphical structures, depicting impacts of assorted arising parameters versus the profiles involved are also provided. It is noticed that the velocity profile is a dwindling function of the Williamson parameter and Hartmann number. It is also stated that the Cattaneo-Christov heat flux exhibits conventional Fourier and Fick’s laws behavior when both coefficients of thermal and concentration relaxations are zero.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 327-335
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibility of using organic fertilization to grow pine plantations on former agricultural lands
    Autorzy:
    Tkaczyk, M.
    Gul, P.
    Olejarski, I.
    Oszako, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/38588.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    organic fertilization
    pine
    Pinus sylvestris
    tree
    plant growth
    plantation
    agricultural land
    Opis:
    In accordance with the National Program for Increasing Forest Cover it is planned to augment Poland’s forest cover to 30% by 2020. This task involves afforestation of agricultural lands by pioneer species that have low habitat requirements, such as the silver birch or the Scots pine. Application of sawdust, clear cutting residues, compost bark and compost beneath tree roots contributed to better development of the assimilation apparatus. The use of mineral fertilizer stimulated tree growth as well as improved physical and chemical properties of soil.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2013, 55, 4
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tribological Behavior of Copper/MWCNT Nanocomposites Produced by Pulse Electrodeposition
    Autorzy:
    Gül, H.
    Uysal, M.
    Akbulut, H.
    Alp, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1181744.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Pq
    78.67.Sc
    81.40.Pq
    61.48.De
    Opis:
    Copper coatings containing well-distributed multiwalled carbon nanotubes were obtained by pulse electrodeposition in acidic sulfate bath in order to improve the microhardness and wear resistance of coatings. Multiwalled carbon nanotubes concentration was determined as the most significant factor for the incorporation of multiwalled carbon nanotubes in copper based electrolyte. The amount of embedded multiwalled carbon nanotubes and the microhardness of nanocomposites were found to increase with the increase of multiwalled carbon nanotubes in the electrolyte. The tribological properties of nanocomposites deposited by pulse electrocodeposition technique were studied by reciprocating ball on-disk method. The characterization of the coatings was investigated by scanning electron microscopy and X-ray diffraction facilities. The experimental results indicated that the wear resistance of copper composite is superior to that of pure copper. The friction coefficient and wear rates decreased with the increase in the concentration of multiwalled carbon nanotubes in the electrolyte.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 254-256
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Speciation of heavy metals during co-composting of livestock manure
    Autorzy:
    Gul, S.
    Naz, A.
    Fareed, I.
    Khan, A.
    Irshad, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/778398.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    heavy metals
    fractionation
    composting
    manure
    temporal changes
    Opis:
    Heavy metals determination in manures provides beneficial information to predict the availability and the potential contamination of environment. Therefore, a study was carried out to investigate heavy metals changes in livestock manure during a co-composting process. The metals were stepwise fractionated into exchangeable, adsorbed, organically bound, carbonate precipitated and residual forms by extracting with 0.5M KNO3, de-ionized water, 0.5M NaOH, 0.05M Na2EDTA and 4M HNO3, respectively. During the extraction process, the amount of metals remained highly dependent on an extraction method and stage of manure composting. Extractions released heavy metals contents in the final composted manure as Zn > Cu > Pb > Cr > Ni > Cd. Irrespective of the days of composting, extracting agents differed in the order HNO3 > Na2EDTA > NaOH > KNO3 > H2O for all heavy metals. Higher concentrations of heavy metals were observed during the early stages of composting. Conversely, there was a progressive increase in the concentrations of K, Ca and Mg during composting of manure. Total C in the manure reduced with composting days.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 3; 19-23
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reverse osmosis as one-step wastewater treatment: a case study on groundwater pollution
    Autorzy:
    Ali, W.
    Rehman, W. U.
    Younas, M.
    Ahmad, M. I.
    Gul, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/779416.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    reverse osmosis (RO)
    membrane separation
    Total Dissolved Solids (TDS)
    Total Coliform
    E. Coli
    Opis:
    The present case study is focused on performance evaluation of a Reverse Osmosis (RO) membrane based pilot plant to treat the ground/surface drinking water sources polluted by flood, rivers and/or canals. The RO plant was designed, fabricated and then operated with polluted water. Two feed water samples having a TDS of 2.000 mg · L−1 and 10.000 mg · L−1 respectively, were taken and analyzed for physical, chemical and microbiological contaminants. The RO plant was run once through over a span of 100 hrs at an operating pressure of 15 bar. TDS rejections were found to be more than 94% while permeate flux was measured to be 25.82 L · m−2 · hr−1 to 40.55 L · m−2 · hr−1. Results show that RO plant has a potential to remove physical, chemical and microbiological contaminants like Total Coliform and E. Coli in one step.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 4; 42-48
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Characterization of Copper Powders with Sn Coating by the Electroless Plating
    Autorzy:
    Uysal, M.
    Cetinkaya, T.
    Gul, H.
    Kartal, M.
    Algul, H.
    Tokur, M.
    Alp, A.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401294.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Aa
    81.15.-z
    73.61.At
    Opis:
    In this work, Sn-Cu composite powders were produced using an electroless process. The tin content on the surface of copper powders was varied by using different concentrations of SnSO₄ in the plating bath. The surface morphology of the produced Sn-Cu composite powders was characterized using scanning electron microscopy (SEM). Energy dispersive spectroscopy (EDS) was used to determine the elemental surface composition of the composites. X-ray diffraction (XRD) analysis was performed to investigate the structure of the Sn-Cu composite powders. The electrochemical performance of Sn-Cu nanocomposites was studied by charge/discharge tests.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1106-1108
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of crushing type on the efficiency of flowing film separation
    Autorzy:
    Sirkeci, A. A.
    Gul, A.
    Bulut, G.
    Ozer, M.
    Guven, O.
    Perek, K. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/109918.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    particle shape characteristics
    liberation degree
    chromite
    shaking table
    Opis:
    In recent years, the influence of different crushing systems (compression, impact, attrition) has been receiving more attention due to their significant role on particle liberation and shape of particles. The objective of this study was to investigate the effects of different crushing systems on both liberation degree and shape factors of chromite particles along with their enrichment conditions by shaking table. The tests were conducted on -1+0.5, -0.5+0.212 and -0.212 mm size fractions using the Wilfley type shaking table. The results of these tests showed that concentrates with higher metal contents were obtained by impact crushing of chromite in proportion to higher liberation degree and roundness of particles. Therefore, it was found that selective breakage can well be obtained by impact crushing in all fractions. The results of this study demonstrated the importance of crushing type on the liberation and enrichment processes.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 2; 601-608
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiotracer investigations of municipal sewage treatment stations
    Autorzy:
    Farooq, M.
    Khan, I.
    Ghiyas-ud-Din, Ghiyas-ud-Din
    Gul, S.
    Palige, J.
    Dobrowolski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/971492.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    wastewater treatment
    residence time distribution
    activated sludge
    radiotracer
    Opis:
    Tracer techniques, which are well-established methods in process dynamics studies in industry, were applied to investigate the dynamics of sewage treatment process. The concept of residence time distribution (RTD) was used to investigate the efficiency of the primary clarifier, aeration tank and secondary clarifier of a sewage treatment plant. Preliminary treatment and modeling of the tracer data was performed using the software DTS Pro Ver. 4.20. A big short - circuiting (by-passing) with a large volume of stagnant zones were found in the primary and secondary clarifiers, while no stagnant zone was detected in the aeration tank.
    Źródło:
    Nukleonika; 2003, 48, 1; 57-61
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cryptosporidiosis outbreak on a dairy farm: Detection of Cryptosporidium parvum as a causative agent in the water source
    Autorzy:
    Karakavuk, M.
    Can, H.
    Döşkaya, M.
    Karakavuk, T.
    Erkunt-Alak, S.
    Köseoğlu, A.E.
    Gül, A.
    Ün, C.
    Gürüz, Y.
    Değirmenci-Döşkaya, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087099.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    neonatal calves
    Cryptosporidium parvum
    diarrhea
    Real-time PCR
    calf lose
    Źródło:
    Polish Journal of Veterinary Sciences; 2021, 24, 3; 323-333
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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