139,448 research outputs found
A bilateral comparison of optical glass refractive index between NMIJ and INRiM for the validation of the measuring systems
No full textA bilateral comparison of refractive index measurements between the National Metrology
Institute of Japan (NMIJ) and the Istituto Nazionale di Ricerca Metrologica (INRiM) was
carried out in 2008. Each laboratory developed a measurement system based on different
principles. NMIJ’s system was based on the interferometric technique and INRiM’s system
was based on a modified method of the traditional refractive technique. A comparison using a
prism-shaped glass made of OHARA BSL7Y was carried out in order to evaluate the newly
developed methods and confirm the consistency of the results. The details of the comparison
artefacts, measurement conditions and uncertainty factors and their degrees of freedom of each
laboratory are described here. The measurement results for the glass at 633 nm at 20 ◦C and
23 ◦C are within each laboratory’s claimed expanded uncertainty (coverage factor k = 2)
which was of the order of 10−6. The agreement between the two different measurement
approaches shows that both systems can be used to obtain accurate measurements
Two-photon absorption spectroscopy of rubidium with a dual-comb technique
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Previous issue date: 6"Dual-comb spectroscopies have great potential for high-resolution molecular and atomic spectroscopies, thanks to the broadband comb spectrum consisting of dense narrow modes\footnote{A. Nishiyama, S. Yoshida, Y. Nakajima, H. Sasada, K. Nakagawa, A. Onae, K. and Minoshima, Opt. Express 24, 25894 (2016).}. In this study, we apply the dual-comb system to Doppler-free two-photon absorption spectroscopy. The outputs of two frequency combs excite several two-photon transitions of rubidium\footnote{A. Hipke, S. A. Meek, T. Ideguchi, T.W. H\""{a}nsch, and N. Picqu\'{e}, Phys. Rev. A 90, 011805(R) (2014).}, and we obtained broadband Doppler-free spectra from dual-comb fluorescence signals. The fluorescence detection scheme circumvents the sensitivity limit which is effectively determined by the dynamic range of photodetectors in absorption-based dual-comb spectroscopies. Our system realized high-sensitive, Doppler-free high-resolution and broadband atomic spectroscopy._x000d_
\begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.9]{figure5.eps} \end{wrapfigure}_x000d_
_x000d_
A part of observed spectra of 5S - 5D transition is shown in the figure. The hyperfine structures of the = 1 - = 3,2,1 transitions are fully-resolved and the spectral widths are approximately 5 MHz. The absolute frequency axis is precisely calibrated from comb mode frequencies which were stabilized to a GPS-disciplined clock._x000d_
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This work was supported by JST through the ERATO MINOSHIMA Intelligent Optical Synthesizer Project and Grant-in-Aid for JSPS Fellows (16J02345).
Development of elliptic core-shell nanoparticles with fluorinated surfactants for ¹⁹F MRI
No full textWu Y., Minoshima M., Kikuchi K.. Development of elliptic core-shell nanoparticles with fluorinated surfactants for ¹⁹F MRI. Frontiers in Chemistry 12, 1408509 (2024); https://doi.org/10.3389/fchem.2024.1408509.Perfluorocarbon-encapsulated silica nanoparticles possess attractive features such as biological inertness and favorable colloidal properties for bioimaging with fluorine magnetic resonance imaging (¹⁹F MRI). Herein, a series of elliptic shaped silica nanoparticles with perfluorocarbon liquid perfluoro-15-crown-5 ether as core (PFCE@SiO₂) were synthesized using fluorinated surfactants N-(perfluorononylmethyl)-N,N,N-trimethylammonium chloride (C10-TAC) and N-(perfluoroheptylmethyl)-N,N,N-trimethylammonium chloride (C8-TAC). The nanoparticles are characterized to obtain elliptic core-shell structures. PFCE@SiO₂ showed strong ¹⁹F NMR signals of the encapsulated PFCE, indicating the potential as a highly sensitive ¹⁹F MRI probe. These elliptic PFCE@SiO₂ nanoparticles provide a new option of ¹⁹F MRI probe with a morphology different from conventional nanospheres
Spatially-localized time dependent solutions including turbulence and their interactions in 2D Kolmogorov flow
No full textIn 2D Kolmogorov flow in small aspect ratio domains, spatially-localized solutions such as kink, traveling or time-dependent kink-antikink pars coexist. However, the conservation of the flow rate in the y direction strongly restrict combination of localized solutions and their positioning. We find that by adding a homogeneous flow U y their positioning is controlled and each of localized solutions including a spatially-localized chaos is isolated. Numerical results suggest that these isolated solutions can be elements constructing a whole flow
Agraphydrus insidiator Minoshima, Komarek & Ohara 2015
No full textAgraphydrus insidiator Minoshima, Komarek & Ôhara, 2015 (Figs. 28, 75, 106, 148) Agraphydrus insidiator Minoshima, Komarek & Ôhara 2015: 48. Type locality. Taiwan, Taichung City, Heping Distr., Basian Shan National Forest Recreation Area. Type material examined. Paratypes: TAIWAN: 1 ex. (NMW): Taipei, Wulai, 9.IX.1993, leg. S.W. Loh; 7 exs. (NMW): Basian-shan Nat. Forest Rec. Area, Heping, Taichung; 920 m a.s.l.; wet cement; N24°11.55′, E121°00.83′, 6.VI.2010, leg. Y. Minoshima “L140”. Additional material examined. TAIWAN: 1 ex. (NMW): Taipei, Wulai 8.IX.1993, leg. M.L. Jeng; 2 ƋƋ (NMW): Taipei, Wulai, 11.IV.1995, leg. L.J. Wang “des. F. Hebauer ”; 1 Ƌ (NMW): Kao Taoyuan, 23.V.1995, leg. L.J. Wang “des. F. Hebauer ” [all specimens labelled “ Paratype Megagraphydrus politus, M. Hansen ”]. Differential diagnosis. This species belongs to the group of species with nine to ten rows of coarse elytral punctures, together with A. attenuatus, A. politus, A. jaechi, A. regularis, and A. siamensis. It shares eightsegmented antennae, alternating primary and secondary rows of coarse elytral punctures, and reduced metafemoral pubescence with A. politus in contrast to all other species. Aedeagus very similar to aedeagus of A. politus with wide, apically inclining parameres; differs from this species by less numerous and wider spaced serial elytral punctures. Description. Total length: 2.3̄ 2.9 mm; elytral width: 1.2̄ 1.5 mm; E.I.: 1.3, P.I.: 2.2̄2.3, elytra 3.1̄3.2× as long as pronotum. Habitus broad, almost parallel-sided in midlength, strongly convex dorsally. Coloration. Labrum, clypeus and frons black, preocular patches absent; maxillary palpi unicolored yellow; pronotum dark rufous brown to black with decreasing intensity of coloration towards yellowish lateral margins; elytra black with very narrow, undefined, yellowish lateral margins, ventrites and legs rufous to black. Head. Clypeus with distinctly, evenly excised anterior margin; C.I.: 4.1, lateral length ratio clypeus/eyes = 1.8; microsculpture absent; ground punctures very fine, interspaces 2̄4× as wide as punctures; systematic punctures distinct. Eyes moderately large, not protruding, slightly oblong. Antennae with eight antennomeres. Maxillary palpi (Fig. 75) slender, as long as pronotum in midline, 0.9× as long as maximum width of clypeus; length ratio palpomere 4:3 = 1.2, palpomere 4 almost symmetrical. Mentum with very fine punctures, grouped on lateral portions. Thorax. Pronotal ground punctation as on head; systematic punctures distinct. Elytral ground punctation as on head and on pronotum; very distinct coarse punctures present, arranged in four “primary” rows of very narrowly spaced, regularly distributed punctures with interspaces 1̄2× as large as width of puncture, alternating with four to five “secondary” rows of more irregularly distributed punctures with interspaces 3̄4× as large as width of puncture, lateral series irregular, few large punctures present within narrow spaces between rows. Mesoventrite with distinct mesal bulge, and with very low carina posterior to bulge, M-shaped anteriorly. Legs (Fig. 106). Pubescence present on more than proximal half of pro- and mesofemur with slightly oblique hairlines, on proximal half of metafemur with straight hairline. Abdomen. Ventrite 5 with shallow apical emargination. Aedeagus (Fig. 148). Length: 0.34̄ 0.39 mm. Phallobase as long as parameres, about as long as wide or slightly longer than wide, evenly curving towards distinctly delimited, moderately long manubrium; border between pigmented and unpigmented portion of ventral face reaching basal third in midline. Parameres wide basally; margins distinctly sigmoid; apex asymmetrical, tapering, distinctly bending mesad; base of dorsal face reaching distal third of phallobase; ventral face distinctly shorter than dorsal face. Median lobe wide at base, evenly narrowing towards bluntly rounded apex; corona large, in subapical position; basal apophyses moderately long, inclining laterad, extending to distal third of phallobase. Ecology. Collected at 920 m a.s.l.; hygropetric on wet rocks. Distribution. Taiwan. Agraphydrus jilanzhui sp. n. (Figs. 29, 107, 149) Type locality. China, Shaanxi Prov., Qin Ling Shan, 33°55'N 108°49'E. Type material. Holotype Ƌ (NMW): “China: Shaanxi, Qin Ling Shan \ 108.49 E, 33.55 N, River Valley \ 40 km S Xian, Autoroute km 50 \ River bank, 1200 m \ 31.08.1995, leg. A. Pütz ”. Paratypes: CHINA: Shaanxi: 9 exs. (NMW): same sampling data; Gansu: 2 exs. (NMW): CWBS 325; 1 ex. (NMW): CWBS 326; Hubei: 2 exs. (NMW): 20 km NW Tongshan, 29.7°N 114.3°E, stream valley, 6. & 19.VI.2002, Jaroslav Turna; Sichuan: 158 exs. (NMW): CWBS 221; 8 exs. (NMW): CWBS 228; 3 exs. (NMW): CWBS 229; 1 ex. (NMW): CWBS 230. Differential diagnosis. This species belongs to the group of species with apically infuscated maxillary palpomere 4 and absence of clypeal microsculpture, together with A. coomani, A. comes, A. confusus, A. ishiharai, and A. robustus (see also Remarks under A. coomani). It differs from these species by dark brown to black elytra. It shares similar aedeagus (with lateral extensions of parameres) with A. ishiharai, differing by length of median lobe (apex not reaching apex of parameres). It shares strong dorsal punctation and lateral extension of parameres with A. robustus, differing by black pronotum with very narrow yellow margins (versus yellow pronotum with narrow, weakly delimited mesal infuscation in A. robustus). Description. Total length: 2.3̄ 2.8 mm; elytral width: 1.0̄ 1.3 mm; E.I.: 1.4̄1.5, P.I.: 2.0̄2.1, elytra 3.2̄3.4× as long as pronotum. Habitus slender, almost cylindrical, elytra slightly widening posterior to midlength, weakly to moderately convex dorsally. Coloration. Labrum black; clypeus black, with very narrow yellow lateral margins, absent in some individuals; frons black; maxillary palpi pale yellowish, palpomere 4 with distinct infuscation in apical third to half; pronotum black with very narrow yellow postero-lateral angles, extending to lateral margins in some individuals; elytra black, with very narrow, very indistinct, yellow lateral margins, with brown posterior area of variable extension in most individuals; ventrites black; legs light brown. Head. Clypeus with distinctly, evenly excised anterior margin; C.I.: 3.0, lateral length ratio clypeus/eyes = 1.6; microsculpture absent; ground punctures coarse, distinctly impressed, interspaces as wide as puncture; systematic punctures moderately distinct. Eyes large, very slightly protruding, very slightly oblong. Antennae with nine antennomeres. Maxillary palpi slender, 1.1× as long as pronotum in midline, 1.1× as long as maximum width of clypeus; palpomere 4 about 1.2× as long as palpomere 3, palpomere 4 slightly asymmetrical. Mentum with some coarse punctures on lateral portion, without microsculpture. Thorax. Pronotal ground punctation as on head; systematic punctures distinct. Elytral ground punctation as on head and pronotum, serially arranged on some areas; systematic punctures moderately distinct, arranged in four rows, mesal rows with strongly reduced number of punctures, not reaching anterior margin. Mesoventrite with very weak mesal bulge. Legs (Fig. 107). Pubescence present on more than proximal half of profemur with oblique hairline, on proximal 2/3 of mesofemur, on proximal 3/4 of metafemur; hairline straight to weakly curved on meso- and metafemur. Abdomen. Ventrite 5 with shallow apical emargination. Aedeagus (Fig. 149). Length: 0.46 mm. Phallobase about as long as parameres, longer than wide, evenly curving proximad; manubrium absent or very small, very indistinctly delimited, border between pigmented and unpigmented portion of ventral face reaching basal third in midline. Parameres slender; margins very weakly sigmoid, with slight subapical constriction; apex obliquely flattened, widening, with short, blunt, lateral and mesal projection; basal portion extending to distal third of phallobase. Median lobe narrow, spatulate; apex almost reaching apex of parameres; corona in apical position; basal apophyses moderately long, extending to distal third of phallobase. Ecology. Collected between 650 and 950 m a.s.l.; in river flowing through secondary forest with large, partly moss-covered rocks; in unpolluted or slightly polluted, cold rivers fast flowing through secondary forests and cultivated land, with pebbles, cobbles, boulders, sand, gravel, and aquatic vegetation. Distribution. China (Gansu, Hubei, Shaanxi, Sichuan). Etymology. The species is dedicated to the entomologist Lanzhu Ji (Shenyang, China).Published as part of Komarek, Albrecht & Hebauer, Franz, 2018, Taxonomic revision of Agraphydrus Régimbart, 1903 I. China and Taiwan (Coleoptera: Hydrophilidae: Acidocerinae), pp. 1-101 in Zootaxa 4452 (1) on pages 44-46, DOI: 10.11646/zootaxa.4452.1.1, http://zenodo.org/record/144514
Characteristics of overlap region in high-Reynolds number turbulent channel flow
No full textDirect numerical simulation of the fully developed turbulent channel flows have been carried out at the Reynolds number based on the friction velocity and the channel half width, 2000, 4000 and 8000. A hybrid 10th order accurate finite difference scheme in the stream and spanwise directions, and a second-order scheme in the wall-normal direction is adapted as the spatial discretization method. We observed the plateau profiles in the indicator function corresponded to the von Karman constant. Furthermore, second peak of streamwise pre-multiplied spectra were appeared in the same wall normal height, 300 < y+ < 600, in case of Re = 4000. Nevertheless, the effects of the lager than the channel half height scale on the streamwise turbulent intensity are fixed contributions without dependence on Reynolds number. These results suggested that the new streamwise vortexes are formed between buffer layer and outer layer with increasing of Reynolds number
La 'circunstancia' de 'Herederos y Pretendientes
No full textIn June 2010, the Ortega y Gasset Foundation hosted a Conference about the “Spanish Philosophical Transition” in order to debate the book of Francisco Vázquez, La filosofía española. Herederos y Pretendientes. Una lectura sociológica (1963-1990), recently published. This paper is the author’s response to criticism raised in the Conference and to published reviews received by this book. First, the author summarized the argument of Herederos y pretendientes. Secondly he responds and takes into account the most important objections against the book’s hypothesis and methodology. Finally the author evaluates the favorable judgments received by the book and suggests the limits of the historian’s task.Fundación Ortega y Gasset-Marañó
Author self-citation in orthodontics is associated with author origin and gender.
No full textBACKGROUND
The aims of this bibliometric study were to determine author self-citation trends in high-impact orthodontic literature and to investigate possible association between self-citation and publication characteristics.
METHODS
Six orthodontic journals with the highest impact factor as ranked by 2017 Journal Citation Reports were screened for a full publication year (2018) for original research articles, reviews, and case reports. Eligible articles were scrutinized for article and author characteristics and citation metrics. Univariable and multivariable negative binomial regression was used to examine associations between self-citation incidence and publication characteristics.
RESULTS
Medians for author self-citation rate of the most self-citing authors and self-citations were 3.03% (range 0-50) and 1 (range 0-19), respectively. In the univariable analysis, there was no association between self-citation counts and study type (P = 0.41), article topic (P = 0.61), number of authors (P = 0.62), and rank of authors (P = 0.56). Author origin (P = 0.001), gender (P = 0.001) and journal (P = 0.05) were associated with self-citation counts and in the multivariable analysis only origin and gender remained strong self-citation predictors. Asian authors and females self-cited significantly less often than all other regions and male authors.
CONCLUSIONS
Authors in orthodontics do not self-cite at a frequency that suggests potential citation manipulation. Author origin and gender were the only variables associated with citations counts. More bibliometric research is necessary to draw solid conclusions about author self-citation trends in orthodontic literature
Overview of the Author Profiling Task at PAN 2013
No full text[EN] This overview presents the framework and results for the Author Profiling
task at PAN 2013. We describe in detail the corpus and its characteristics,
and the evaluation framework we used to measure the participants performance to
solve the problem of identifying age and gender from anonymous texts. Finally,
the approaches of the 21 participants and their results are described.The author profiling task @PAN-2013 was an activity of the WIQ-EI IRSES project (Grant No. 269180) within the FP 7 Marie Curie People Framework of the European Commission. We want to thank the Forensic Lab of the Universitat Pompeu Fabra Barcelona for sponsoring the award for the winner team. The work of the first author was partially funded by Autoritas Consulting SA and by Ministerio de Economía y Competitividad de España under grant ECOPORTUNITY IPT-2012-1220-430000. The work of the second author was in the framework the DIANA-APPLICATIONS-Finding Hidden Knowledge in Texts: Applications (TIN2012-38603-C02-01) project, and the VLC/CAMPUS Microcluster on Multimodal Interaction in Intelligent Systems. The work of fifth author was funded in part by the Swiss National Science Foundation (SNF) project "Mining Conversational Content for Topic Modelling and Author Identification (ChatMiner)" under grant number 200021_130208.Rangel, F.; Rosso, P.; Koppel, M.; Stamatatos, E.; Inches, G. (2013). Overview of the Author Profiling Task at PAN 2013. CLEF Conference on Multilingual and Multimodal Information Access Evaluation. 352-365. https://riunet.upv.es/handle/10251/46636S35236
Author Co-Citation Analysis (ACA): a powerful tool for representing implicit knowledge of scholar knowledge workers
No full textIn the last decade, knowledge has emerged as one of the most important and valuable organizational assets. Gradually this importance caused to emergence of new discipline entitled ―knowledge management‖. However one of the major challenges of knowledge management is conversion implicit or tacit knowledge to explicit knowledge. Thus Making knowledge visible so that it can be better accessed, discussed, valued or generally managed is a long-standing objective in knowledge management. Accordingly in this paper author co- citation analysis (ACA) will be proposed as an efficient technique of knowledge visualization in academia (Scholar knowledge workers)
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