51,851 research outputs found
Development of composite calibration standard for quantitative NDE by ultrasound and thermography
Full text linkInspection of aircraft components for damage utilizing ultrasonic Non-Destructive Evaluation (NDE) is a time intensive endeavor. Additional time spent during aircraft inspections translates to added cost to the company performing them, and as such, reducing this expenditure is of great importance. There is also great variance in the calibration samples from one entity to another due to a lack of a common calibration set. By characterizing damage types, we can condense the required calibration sets and reduce the time required to perform calibration while also providing procedures for the fabrication of these standard sets. We present here our effort to fabricate composite samples with known defects and quantify the size and location of defects, such as delaminations, and impact damage. Ultrasonic and Thermographic images are digitally enhanced to accurately measure the damage size. Ultrasonic NDE is compared with thermography.This proceeding may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.
This proceeding appeared in Dayal, Vinay, Zach G. Benedict, Nishtha Bhatnagar, and Adam G. Harper. "Development of composite calibration standard for quantitative NDE by ultrasound and thermography." In AIP Conference Proceedings, vol. 1949, no. 1, p. 060006. AIP Publishing LLC, 2018, and may be found at
DOI: 10.1063/1.5031552.
Copyright 2018 The Author(s).
Posted with permission
Observations of Bºs→ψ(2S)η and Bº(s)→ψ(2S)π+π- decays
Full text linkFirst observations of the B0s
→ψ(2S)η, B0 →ψ(2S)π
+
π
− and B0s
→ψ(2S)π
+
π
− decays are made
using a dataset corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment in
proton–proton collisions at a centre-of-mass energy of
√
s = 7 TeV. The ratios of the branching fractions
of each of the ψ(2S) modes with respect to the corresponding J/ψ decays are
B(B0s
→ψ(2S)η)
÷
B(B0s
→J/ψη)
= 0.83± 0.14 (stat)±0.12 (syst) ±0.02 (B),
;
B(B0→ψ(2S)π
+
π
−
)
÷
B(B0→J/ψπ
+
π
−
)
= 0.56± 0.07 (stat)±0.05 (syst)± 0.01 (B),
;
B(B0s
→ψ(2S)π
+
π
−
)
÷
B(B0s
→J/ψπ
+
π
−
)
= 0.34± 0.04 (stat)±0.03 (syst)± 0.01 (B),
where the third uncertainty corresponds to the uncertainties of the dilepton branching fractions of the J/ψ
and ψ(2S) meson decays
Kinetics of Spontaneous and EF-G-Accelerated Rotation of Ribosomal Subunits
Full text linkSummaryRibosome dynamics play an important role in translation. The rotation of the ribosomal subunits relative to one another is essential for tRNA-mRNA translocation. An important unresolved question is whether subunit rotation limits the rate of translocation. Here, we monitor subunit rotation relative to peptide bond formation and translocation using ensemble kinetics and single-molecule FRET. We observe that spontaneous forward subunit rotation occurs at a rate of 40 s−1, independent of the rate of preceding peptide bond formation. Elongation factor G (EF-G) accelerates forward subunit rotation to 200 s−1. tRNA-mRNA movement is much slower (10–40 s−1), suggesting that forward subunit rotation does not limit the rate of translocation. The transition back to the non-rotated state of the ribosome kinetically coincides with tRNA-mRNA movement. Thus, large-scale movements of the ribosome are intrinsically rapid and gated by its ligands such as EF-G and tRNA
Nfix Induces a Switch in Sox6 Transcriptional Activity to Regulate MyHC-I Expression in Fetal Muscle
Full text linkSox6 belongs to the Sox gene family and plays a pivotal role in fiber type differentiation, suppressing transcription of slow-fiber-specific genes during fetal development. Here, we show that Sox6 plays opposite roles in MyHC-I regulation, acting as a positive and negative regulator of MyHC-I expression during embryonic and fetal myogenesis, respectively. During embryonic myogenesis, Sox6 positively regulates MyHC-I via transcriptional activation of Mef2C, whereas during fetal myogenesis, Sox6 requires and cooperates with the transcription factor Nfix in repressing MyHC-I expression. Mechanistically, Nfix is necessary for Sox6 binding to the MyHC-I promoter and thus for Sox6 repressive function, revealing a key role for Nfix in driving Sox6 activity. This feature is evolutionarily conserved, since the orthologs Nfixa and Sox6 contribute to repression of the slow-twitch phenotype in zebrafish embryos. These data demonstrate functional cooperation between Sox6 and Nfix in regulating MyHC-I expression during prenatal muscle development.</p
The Origin of G. S. hominis, cardinis, ordinis (G.S. of -N Stem -ōnis vs. -inis)
Full text linkThe paper deals with an oddity in Latin morphology: the fact that a number of nouns (margō, ōrdō,
cardō, homō and nēmō), in spite of being masculine, have, contrary to the general tendency, the G. S. in
-inis instead of -ōnis. Some of the nouns (margō, ōrdō, cardō), unlike the other masculine nouns, retained
their original G. S. form in -inis (which traces back to Old Latin *-ones) presumably due to analogy with
the large group of feminine nouns in -dō, -gō because they have the same consonant at the end of stem. The
G. S. of another exception, homō, is explained by analogy with the neuter nouns of the type nomen, nominis.
The author also argues that the majority of G. S.-ōnis of feminina abstracta in -iō (type nātiō, -ōnis) can be
explained phonologically without referring to their gender. Refs 8
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Sopj: A scalable online provenance join for data integration
No full textData integration is a technique used to combine different sources of data together to provide an unified view among them. MOMIS[1] is an open-source data integration framework developed by the DBGroup1. The goal of our work is to make MOMIS be able to scale-out as the input data sources increase without introducing noticeable performance penalty. In particular, we present a full outer join method capable to efficiently integrate multiple sources at the same time by using data streams and provenance information. To evaluate the scalability of this innovative approach, we developed a join engine employing a distributed data processing framework. Our solution is able to process input data sources in the form of continuous stream, execute the join operation on-the-fly and produce outputs as soon as they are generated. In this way, the join can return partial results before the input streams have been completely received or processed optimizing the entire execution
Erratum: Patients with Severe Obesity during the COVID- 19 Pandemic: How to Maintain an Adequate Multidisciplinary Nutritional Rehabilitation Program? (Obes Facts. (2021) DOI: 10.1159/000513283)
No full textIn the article by De Amicis et al. entitled "Patients with Severe Obesity during the COVID- 19 Pandemic: How to Maintain an Adequate Multidisciplinary Nutritional Rehabilitation Program?" [Obes Facts. 2021, DOI: 10.1159/000513283], the author list is incorrect. The correct author list is: De Amicis R. Cancello R. Capodaglio P. Gobbi M. Brunani A. Gilardini L. Castelnuovo G. Molinari E. Barbieri V. Mambrini S.P. Battezzati A. Bertoli S
Spin polarization effects on magnetic dipole moment of 153,155Eu
No full textUsing the Quasiparticle Phonon Nuclear Model (QPNM) and taking into account the spin-spin interaction the effects of the spin polarization on the intrinsic magnetic moments (g(K)) of Eu153-155 isotopes have been studied. Our calculations indicated that because of the spin polarization, the spin gyromagnetic factors (g(s)) of the nucleons in the nucleus reduce noticeable from its free nucleon value and the spin-spin interactions play an important role in the renormalization (g(s)(eff.)) of the g(s) factors. A very good reproduction of the phenomenological quenching of g(s) factor from its free values (g(s)(eff) congruent to 0.6-0.7 g(s)(free)) is obtained. The calculated values of effective g(s)(eff.) and g(K) are also in fair agreement with the experiment data
Buffer-stock Saving and Households' Response to Income Shocks
Full text linkThis is the pre-peer reviewed version of the following article: Fella, G., Frache, S. and Koeniger, W. (2020), BUFFER‐STOCK SAVING AND HOUSEHOLDS' RESPONSE TO INCOME SHOCKS. International Economic Review. Accepted Author Manuscript. doi:10.1111/iere.12459
, which has been published in final form at https://doi.org/10.1111/iere.12459. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions
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