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Tytuł:
Revision of the late Ordovician trilobite Holotrachelus punctillosus [Tornquist, 1884] from Dalarna, Sweden
Autorzy:
Suzuki, Y
Powiązania:
https://bibliotekanauki.pl/articles/20129.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
trilobite
Cheiruridae
Trilobita
Sphaerexochinae
late Ordovician
Sweden
Proetida
Ordovician
Holotrachelus
Boda Limestone
Holotrachelus punctillosus
Opis:
Holotrachelus punctillosus from the Boda Limestone (Ashgill, Upper Ordovician) of Sweden is redescribed. The systematic position of this problematic species is discussed. Its distinctive morphology appears to be the result of an adaptation towards illaenid life habits. The pygidial morphology, with the extra-fulcral field developed as segmental pleural spines, makes an assignment possible to only four Ordovician groups, namely the Remopleuridioidea, Odontopleuroidea, Lichoidea and Cheiruroidea. Of these, the former three are so different that a direct affiliation is out of the question. Similarities with the Cheiruroidea are the more persuasive, particularly after a misinterpretation of the facial suture is corrected and some other problems are sorted out. It is suggested that the Holotrachelinae are placed within the Cheiruridae, where it may have special affinities to the Sphaerexochinae.
W pracy przedstawiono redeskrypcję trylobita Holotrachelus punctillosus, pochodzącego ze szwedzkich wapieni Boda (aszgil, górny ordowik) i omówiono pozycję systematyczną tego problematycznego gatunku. Jego charakterystyczna morfologia wydaje sie być związana z przystosowaniem do trybu zycia typowego dla Illaenidae. Morfologia pygidium, z polem pozawidełkowym rozwiniętym w postaci członowanych kolców pleuralnych, umożliwia zaliczenie holotrachelusa do jednej z czterech ordowickich nadrodzin: Remopleuridioidea, Odontopleuroidea, Lichoidea lub Cheiruroidea. Holotrachelus wykazuje najwieksze podobieństwo do Cheiruroidea, zwłaszcza po skorygowaniu mylnej interpretacji szwu policzkowego. Autor sugeruje, że Holotrachelinae należy umieścić w obrębie Cheiruridae, przy czym najbliższe pokrewieństwa mogą je łączyć ze Sphaerexochinae.
Źródło:
Acta Palaeontologica Polonica; 2001, 46, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphological requirements in limulid and decapod gills: A case study in deducing the function of lamellipedian exopod lamellae
Autorzy:
Suzuki, Y
Kondo, A.
Bergstrom, J.
Powiązania:
https://bibliotekanauki.pl/articles/20381.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
morphology
total gill surface
paleontology
lamella
Decapoda
Limulidae
Limulus polyphemus
lamellipedian arachnomorph
gill lamella
allometry
arthropod
gill
respiration
Arthropoda
Opis:
According to one hypothesis, the exopods of extinct lamellipedian arthropods functioned as gills. To evaluate this hypothesis, the growth rates in Limulus polyphemus for total gill surface, average area per single gill lamella and number of gill lamellae are documented. The rates are compared with corresponding rates in decapod crustaceans in order to make deductions on morphological constraints in multi−foliated gills. The growth rates are given as allometric scaling exponents relative to the animal dry−body weight. The comparisons reveal that each allometric exponent is similar among examined species irrespective of differences in gill morphology or animal body plans. The numerical growth of lamellae obviously is much smaller than the growth of the total respiratory surface. To fulfill these trends in multi−foliated gills, the overall profile tends to become conical, with the result that the surface area is a couple of magnitudes larger at the base of the cone than at the tip. This geometrical shape appears to keep the numerical value of the total respiratory area (total lamellar surface) proportional to the cube of the total number of lamellae. The situation is entirely different in animals with lamellipedian exopods. In the latter, lamellae are slender structures carried in a straight row and, as exemplified by Naraoia, their increase in number during the growth is only half that required for the exopod lamellae to have functioned as an arthropod multi−foliated gill cone.
Źródło:
Acta Palaeontologica Polonica; 2008, 53, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic Temperature and Density of Ar(I) for 4S[1/2]0 State in a Facing Target Sputtering System
Autorzy:
Yasuda, Y.
Nishimiya, N.
Hoshi, Y.
Suzuki, M.
Powiązania:
https://bibliotekanauki.pl/articles/1791238.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.30.-r
42.62.Fi
52.70.-m
Opis:
The 4S' [1/2]0 → 4P' [3/2]1 transition of Ar(I) in a facing target sputtering chamber is measured using a Ti:sapphire ring laser at several operating conditions. Doppler width and line intensity are determined by analysis using the Voigt function. The thermodynamic temperature determined from the Doppler width increases linearly with discharge current and gas pressure. The population density from the line intensity is reduced to the reference temperature obtained by interpolating the discharge current to zero. The empirical relationship to describe population density at a discharge current and a gas pressure is discussed.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 560-562
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polymerization of Epoxy Resins Studied by Positron Annihilation
Autorzy:
Suzuki, T.
Hayashi, T.
Ito, Y.
Powiązania:
https://bibliotekanauki.pl/articles/2007966.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
83.80.Cq
Opis:
The polymerization process of epoxy resins (bisphenol-A dicyanate) was studied using positron-annihilation lifetime spectroscopy. The polymerization from monomer to polymer through a polymerization reaction was followed by positron-annihilation lifetime spectroscopy measurements. Resins kept at curing temperatures (120, 150, and 200°C) changed form from a powder to a solid through a liquid. The size of the intermolecular spaces of the solid samples increased along with the progress of polymerization.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 671-676
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Visible Light Irradiation on Positronium Formation in Polyethylene at Low Temperature
Autorzy:
Ito, Y.
Hirade, T.
Hamada, E.
Suzuki, T.
Powiązania:
https://bibliotekanauki.pl/articles/2007996.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The effect of visible light exposing on the ortho-positronium formation in polyethylene was studied. Lifetime spectra of positrons in polyethylene were measured in the temperature range between 50 K and 370 K. It was observed that the visible light quenches the enhancement of ortho-positronium intensity (I$\text{}_{3}$) at lower temperature than ca. 250 K - the glass transition temperature of polyethylene. On the other hand, the lifetime of ortho-positronium component (τ$\text{}_{3}$) was not affected by the presence of the visible light.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 533-538
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Irradiation Effects on Positronium Formation in Polycarbonate Sduring a Positron-Annihilation Experiment
Autorzy:
Suzuki, T.
Kondo, K.
Hamada, E.
Ito, Y.
Powiązania:
https://bibliotekanauki.pl/articles/2025767.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The positron-irradiation effect on polycarbonate during a positron-annihilation lifetime spectroscopy experiment was investigated using different intensities of $\text{}^{22}$Na positron sources andγ-irradiated samples. The decrease in I$\text{}_{3}$ was larger for a larger intensity of positron sources. In the case of a weak source (≈ 140 kBq), I$\text{}_{3}$ did not change with the elapsed time for non-irradiated samples. However, for 1 MGy irradiated samples, I$\text{}_{3}$ measured with the weak source increased with the elapsed time. This can be attributed to a decrease in the radicals induced in the irradiated samples by γ-irradiation. In order to explain the change in I$\text{}_{3}$ measured at room and liquid-nitrogen temperatures, several effects, such as radicals, cross-linking, structure change, and charging, need to be considered. Also, it is difficult to explain the change in I$\text{}_{3}$ using only one of these effects.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 515-521
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of Shallow Dislocations on 4H-SiC Substrate by Etching Method
Autorzy:
Ishikawa, Y.
Yao, Y.
Sato, K.
Sugawara, Y.
Danno, K.
Suzuki, H.
Bessho, T.
Kawai, Y.
Shibata, N.
Powiązania:
https://bibliotekanauki.pl/articles/1492539.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.uj
81.65.Cf
68.37.Lp
Opis:
Correlation between dislocation types in epitaxial 4H-SiC and etch pit types on the 4H-SiC wafer surface were investigated by etch pit method and transmission electron microscope. Shallow dislocation on the wafer was found to form round pit without core. The shallow dislocation was estimated half-loop type in wafer and this estimation explains that step-flow growth converts half-loop dislocation into complex dislocation composed by threading dislocation and basal plane dislocation.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-025-A-027
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
F-AlCoPdGe Alloy with Three Types of Pseudo-Mackay Clusters
Autorzy:
Sugiyama, K.
Yubuta, K.
Yokoyama, Y.
Suzuki, S.
Simura, R.
Powiązania:
https://bibliotekanauki.pl/articles/1373510.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Dk
61.05.cp
61.44.Br
Opis:
The structure of an F-AlCoPdGe alloy was determined by single-crystal X-ray diffraction analysis: space group Pa3̅ (No. 205), Pearson symbol cP1128-142.4, a = 24.4338(4) Å; R1 = 0.0526 for the observed 5106 reflections with $F_0$ > 4.0σ$(F_0)$. The F-AlCoPdGe alloy exhibited three types of pseudo-Mackay clusters (pMCs). The first shell of the Co(13)-pMC at 24d indicated a coordination polyhedron typically found in Al-Co binary approximants; the second shell was a combination of an M icosahedron and an Al icosidodecahedron, where M is a mixed site of Pd and/or Co. The first shell of the Co(14)-pMC at 4b consisted of 20 partially occupied Al positions arranged in a dodecahedral fashion; its second shell was also composed of an M icosahedron and an Al icosidodecahedron. The first shell of the Al(18)-pMC at 4a consisted of a combination of an M cube and an Al octahedron, resulting in the rhombic dodecahedral arrangement; its outer shell structure was similar to those of the other pMCs. The structure of the F-AlCoPdGe phase comprised an arrangement of these three types of pMCs together with interstitially placed Al icosahedra around the Pd/Al(1) and Pd/Al(2) sites.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 588-593
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of reliability of perioral muscle pressure measurements using a newly developed device with a lip piece
Autorzy:
Takahashi, M.
Koide, K.
Suzuki, H.
Satoh, Y.
Iwasaki, S.-I.
Powiązania:
https://bibliotekanauki.pl/articles/306575.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nacisk
wiarygodność
mięśnie
jama ustna
tongue pressure
upper lip pressure
lower lip pressure
absolute reliability
relative reliabilit
Opis:
Purpose: We examined the reliability of measurements using a newly developed perioral muscle pressure measuring device with a lip piece in healthy adults. Methods: Subjects were 40 healthy men (25.8 years) with normal stomatognathic function. Perioral muscle pressure measuring device with a lip piece was used to measure upper lip, lower lip and tongue pressure, and a balloon-based measurement device was used to measure tongue and cheek pressure. Each measurement was taken twice with a 1-min interval between the two measurements. We determined intra-rater reliability by using the intra-class correlation coefficient as a test of relative reliability. As a test of absolute reliability, Bland–Altman analysis was used to assess systematic bias and the 95% confidence interval of the minimal detectable change was calculated. Additionally, the coefficient of variation was calculated. The Spearman–Brown formula was calculated the number of measurements needed to achieve a confidence coefficient ≥0.9. Each set of measurements was followed by a second set that were taken 1 week later. Results: All measurements showed high values of intra-class correlation coefficient. Upper lip, tongue, and cheek pressure can be determined based on a single measurement, while lower lip pressure requires averaging twice. No systematic bias was observed. The coefficients of variation of measurements were almost the same between the two devices. Conclusion: Measurements were highly reliable regardless of the type of perioral muscles. Our findings suggest that the method described in this study is useful as a quantitative chair side method for examining perioral muscle pressure.
Źródło:
Acta of Bioengineering and Biomechanics; 2016, 18, 1; 145-153
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
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