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    Wyświetlanie 1-6 z 6
    Tytuł:
    Development of crystals based on cesium iodide for measurements of gamma radiation and alpha particles
    Autorzy:
    Pereira, M. C. C.
    Filho, T. M.
    Hamada, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148098.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    scintillator
    crystals
    gamma radiation
    alpha particles
    luminescence
    Opis:
    During the past 50 years, scintillators have been among the most important nuclear radiation detectors. Inorganic scintillators are widely used in experimental nuclear physics, high energy physics, nuclear medicine, nuclear tomography, environmental studies and many other fields of use. Scintillation crystals based on cesium iodide (CsI) are matters of relatively low hygroscopy, high atomic number, easy handling and low cost, characteristics that favor their use as radiation detectors. In this work, the growth of pure CsI crystals, CsI:Br and CsI:Pb, using the Bridgman technique, is described. Ions of divalent lead (Pb2+) doped in the crystal structures are efficient emission centers and their application as scintillators is still the reason for intensive studies. Recently, promising results have been found for crystals of CsI doped by bromine (Br) for their use as radiation detectors. The concentration of the bromine doping element (Br) was studied in the range from 1.5 × 10–1 M to 10–2 M and the lead (Pb) in the range from 10–2 M to 5 × 10–4 M. To evaluate the scintillators developed, systematic measurements were carried out for luminescence emission and luminescence decay time for gamma radiation, Vickers microhardness assays, and analysis of crystals response to the gamma radiation, in the energy range from 350 keV to 1330 keV, and alpha particles from a 241Am source, with energy of 5.54 MeV. The obtained values for luminescence decay time for CsI:Br and CsI:Pb crystals, were from 13 to 19 ns.
    Źródło:
    Nukleonika; 2009, 54, 3; 151-155
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biokinetics and radiation dosimetry for [4-14C] cholesterol in humans
    Autorzy:
    Marcato, L. A.
    Hamada, M. M.
    de Mesquita, C. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/146882.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    [4-14C]-cholesterol
    internal dosimetry
    dosimetric model
    medical internal radiation dose (MIRD)
    Opis:
    This study proposes a biokinetic model for using in the assessment of the internal dose received by human subjects administered intravenously or orally with [4-14C]-cholesterol. The proposed model includes three systemic pools representing the short-term (T1/2 = 1 d), intermediate-term (T1/2 = 16 d) and long-term (T1/2 = 78 d) physiological exchanges and two excretion pathways: urine and feces. To validate the model, the predicted excretion and absorption of cholesterol was compared with that described in the literature. The radiometric doses were calculated in function of the phantom body mass (M) applying MIRD (medical internal radiation dose) protocol with ANACOMP software. The effective dose coefficients for oral administration were: 2.93×10–10 Sv.Bq–1 (73.3 kg); 3.84×10–10 Sv.Bq–1 (56.8 kg); 6.74 × 10–10 Sv.Bq–1 (33.2 kg) and 7.72 × 10–10 Sv.Bq–1 (19.8 kg). To determinate the dose for intermediate body mass M the polynomial interpolation can be used: Sv.Bq–1 (kg) = 6 × 10–15M3 – 8 × 10–13M2 + 2 × 10–11M + 6 × 10–10 (R2 ≅ 1). In the same way, for intravenous administration were: 3.72 × 10–10 Sv.Bq–1 (73.3 kg); 4.87 × 10–10 Sv.Bq–1 (56.8 kg); 8.49 × 10–10 Sv.Bq–1 (33.2 kg); 1.26 × 10–9 Sv.Bq–1 (19.8 kg). Similarly, for any M body mass: Sv.Bq–1 (kg) = –4 × 10–15M3 + 9 × 10–13M2 – 7 × 10–11M + 2 × 10–9 can be used.
    Źródło:
    Nukleonika; 2012, 57, 4; 607-613
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparative study on the performance of radiation detectors from the HgI2 crystals grown by different techniques
    Autorzy:
    Martins, J. F. T.
    Costa, F. E.
    dos Santos, R. A.
    de Mesquita, C. H.
    Hamada, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146916.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    crystal growth
    iodide mercury crystal
    physical vapor transport (PVT)
    radiation detector
    semiconductor crystal
    Opis:
    In this work, the establishment of a technology for HgI2 purification and crystal growth is described, aiming at a future application of this crystal as a room temperature radiation semiconductor detector. Two methods of crystal growth were studied in the development of this work: (1) physical vapor transport (PVT) and (2) saturated solution from dimethylsulphoxide (DMSO) complexes. In order to evaluate the crystals obtained using each of these methods, systematic measurements were carried out for determining the stoichiometry, structure, orientation, surface morphology and impurity of the crystal. The influence of these physicochemical properties of the crystals developed was evaluated in terms of their performance as a radiation detector. The best response to radiation was found for the crystals grown by the PVT technique. Significant improvement in the performance of HgI2 radiation detector was found, purifying the crystal by means of two successive growths by the PVT technique.
    Źródło:
    Nukleonika; 2012, 57, 4; 555-562
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gamma-ray computed tomography SCANNERS for applications in multiphase system COLUMNs
    Autorzy:
    Calvo, W. A. P.
    Hamada, M. M.
    Sprenger, F. E.
    Vasquez, P. A. S.
    Rela, P. R.
    Martins, J. F. T.
    de Matos Pereira, J. C. S.
    Omi, N.
    de Mesquita, C. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/148082.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    industrial computed tomography
    multiphase flow systems
    non-destructive testing
    gas absorption column
    industrial process optimization
    packed distillation columns
    scanning systems
    Opis:
    Gamma-ray tomography experiments have been carried out to detect spatial patterns in the porosity, in a 0.27 m diameter packed steel column using a first generation computed tomography (CT) system. The CT scanner consists of a NaI(Tl) detector 5.08 cm in diameter, and an encapsulated 137Cs (3.7 GBq) radioactive source, located opposite to the center of the detector. The detector and the source, mounted on a fixed support and the column, can rotated and dislocate by two stepping motors controlled through a microprocessor. Different sizes of stainless steel Raschig rings (12.6, 37.9 and 76 mm) have been examined. The primary objective of this work is to detect spatial patterns and statistical information on porosity variation in packed distillation columns. Horizontal scans, at different vertical positions of the packed bed were made for each size of Raschig rings. Radial porosity variation within the packed bed has been determined. This study has demonstrated that the porosity and its spatial distribution in a metallic packed column can be measured with adequate spatial resolution using the gamma-ray tomography technique. After validation of this first generation CT, the turntable design to rotate and dislocate the 60Co or 137Cs sealed gamma-ray sources and multidetector array for the third generation industrial computed tomography was also developed.
    Źródło:
    Nukleonika; 2009, 54, 2; 129-133
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oil yield and fatty acid profile of seeds of three Salvia species. A comparative study
    Wydajność otrzymywania oleju i profil kwasów tłuszczowych nasion trzech gatunków Salvia. Badania porównawcze
    Autorzy:
    Ben Farhat, M.
    Chaouch-Hamada,, R.
    Landoulsi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/72235.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    plant material
    oil yield
    fatty acid profile
    polyunsaturated fatty acid
    seed
    seed oil
    Salvia
    plant species
    comparative analysis
    principal component analysis
    Opis:
    A comparative study of the oil yield and fatty acid composition of three Salvia species seeds collected in different locations has been conducted. Seed oil extraction was made using a Soxhlet-extractor and fatty acid analysis was undertaken using a GC-FID. The effect of the collecting site on oil yield, as well as the content of individual fatty acid and total fatty acid and fatty acid content was significant. Seed oil yield varied from 14.94 to 22.83% and the total fatty acids ranged from 67.36 to 82.49 mg/g DW. α-Linolenic (24.02-49.19%), linoleic (20.13-42.88%), oleic (12.97-17.81%) and palmitic (8.37-16.63%) acids were the most abundant fatty acids in all analyzed samples. α-Linolenic acid was found to be the major fatty acid in S. verbenaca and S. officinalis species, however, S. aegyptiaca was characterized by the prevalence of linoleic acid. Among the unsaturated fatty acids, which were represented in all samples in high amounts (78.16-89.34%), the polyunsaturated fatty acids (α-linolenic and linoleic acids) showed important levels ranging from 63.09 to 74.71%. Seeds of S. verbenaca were the richest in polyunsaturated fatty acids.
    W niniejszej pracy przeprowadzono badanie porównawcze oleju i składu kwasów tłuszczowych otrzymywanych z nasion trzech gatunków szałwii pochodzących z różnych stanowisk. Ekstrakcję oleju z nasion przeprowadzono przy użyciu aparatu Soxhleta. Analizę kwasów tłuszczowych przeprowadzono za pomocą GC-FID. Wpływ miejsca zbioru na wydajnosć otrzymywania oleju, całkowitą zawartość kwasów tłuszczowych i zawartość poszczególnych kwasów tłuszczowych był istotny. Zawartość oleju w nasionach wahała się od 14,94 do 22,83%, a suma kwasów tłuszczowych od 67,36 do 82,49 mg/g suchej masy. W analizowanych próbach dominował kwas α-linolenowy (24,02–49,19%), linolowy (20,13–42,88%), oleinowy (12,97–17,81%) i palmitynowy (8,37–16,63%). Głównym kwasem tłuszczowym w S. verbenaca i S. officinalis okazał się kwas α-linolenowy, natomiast w S. aegyptiaca zanotowano przewagę kwasu linolowego. Spośród nienasyconych kwasów tłuszczowych, które były w dużej ilości reprezentowane we wszystkich próbach (78,16– 89,34%), wielonienasycone kwasy tłuszczowe (kwas α-linolenowy i kwas linolowy) stanowiły od 63,09 do 74,71%. Ich największą zawartość stwierdzono w nasionach S. verbenaca.
    Źródło:
    Herba Polonica; 2015, 61, 2
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The relationship between trunk and pelvis kinematics during pregnancy trimesters
    Autorzy:
    Eldeeb, A. M.
    Hamada, H. A.
    Abdel-Aziem, A. A.
    Youssef, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/306926.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ciąża
    miednica
    analiza ruchu
    pregnancy
    pelvis
    motion analysis
    trunk
    Opis:
    Purpose: Pregnancy is characterized by many musculoskeletal changes that affect daily living activities and walking. The purpose of this study was to examine the effect of pregnancy on pelvic and trunk kinematics, and their relationship during the three pregnancy trimesters. Methods: Three-dimensional pelvis and trunk motions were measured using Qualisys Gait Analysis System in the first, second and third trimesters of pregnancy. The maximum anterior pelvic tilt and maximum trunk flexion during stance phase, pelvic tilt, obliquity and rotation, as well as trunk flexion-extension, lateral bending and rotation were measured. Results: Repeated-measures analysis of variance showed a significant increase in the maximum anterior pelvic tilt during stance phase (p=0.005), and a significant decrease in the pelvic obliquity (p=0.011), maximum trunk flexion during stance phase (p=0.0006), trunk lateral bending (p=0.005) and trunk rotation (p=0.004). A significant negative correlation was found between maximum anterior pelvic tilt and maximum trunk flexion in the first (r=-0.72, p=0.008), second (r=-0.61, p=0.03), and third (r=-0.61,p=0.03) trimesters of pregnancy. Also, there was a significant positive correlation found between pelvic obliquity and trunk lateral bending in the first (r=0.76, p=0.04), second (r=0.59, p=0.04), and third (r=0.59, p=0.04) trimesters of pregnancy. Conclusions: The pregnant women walk with an increased maximum anterior pelvic tilt, a decreased maximum trunk flexion, a decreased pelvic obliquity, as well as a decreased trunk lateral bending and rotation. Pregnancy does not affect the relationship between pelvis and trunk motions.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 4; 79-85
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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