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In the present paper, the failure of a pressure armour in a flexible riser under fretting wear loading is analysed. Fretting lifetime is evaluated through the multiaxial fatigue criterion by Carpinteri et al., implementing the critical direction method proposed by Araujo et al. to define the orientation of the critical plane. The fretting map (in terms of number of loading cycles to failure against displacement amplitude) is build starting from the simulation results of some fretting wear tests in partial slip regime. Then, such a map is compared with that determined by means of the results derived through a combined experimental and numerical methodology available in the literature.
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Integrating data from multiple sources with the aim to identify records that correspond to the same entity is required in many real-world applications including healthcare, national security, and businesses. However, privacy and confidentiality concerns impede the sharing of personal identifying values to conduct linkage across different organizations. Privacy-preserving record linkage (PPRL) techniques have been developed to tackle this problem by performing clustering based on the similarity between encoded record values, such that each cluster contains (similar) records corresponding to one single entity. When employing PPRL on databases from multiple parties, one major challenge is the prohibitively large number of similarity comparisons required for clustering, especially when the number and size of databases are large. While there have been several private blocking methods proposed to reduce the number of comparisons, they fall short in providing an efficient and effective solution for linking multiple large databases. Further, all of these methods are largely dependent on data. In this paper, we propose a novel private blocking method for efficiently linking multiple databases by exploiting the data characteristics in the form of probabilistic signatures and introduce a local blocking evaluation step for validating blocking methods without knowing the ground-truth. Experimental results show the efficacy of our method in comparison to several state-of-the-art methods.
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Integrating data from multiple sources with the aim to identify records that correspond to the same entity is increasingly being required in many real-world applications including healthcare, na- tional security, and businesses. However, privacy and con€dential- ity concerns impede the exchange or sharing of personal identi- fying values, which are o‰en required to conduct linkage across di'erent organizations. Privacy-preserving record linkage (PPRL) techniques have been developed to tackle this problem by perform- ing clustering based on the similarity/distance between masked (encoded) record values, such that each cluster contains (similar) records corresponding to one single entity. When employing PPRL on databases from multiple parties, one major challenge is the pro- hibitively large number of similarity comparisons required for the clustering, especially when the number and size of databases are large. While there have been several private blocking methods pro- posed in the literature to reduce the number of comparisons, they are largely dependent on data and their fault tolerance to data errors and variations is not e'ective. In this paper, we propose a novel private blocking method for eciently linking multiple databases by exploiting the data characteristics in the form of probabilistic signatures (p-signature). Experiments conducted on real datasets show that our approach outperforms existing blocking methods in terms of blocking quality, eciency in reducing the comparison space, and privacy guarantees against frequency a‹acks on the blocks
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A method is described for the inductively coupled plasma optical emission spectrometric (ICP-OES) determination of rare earth elements (REE), yttrium (Y), thorium (Th) and phosphorus (P) in monazite samples. Sample preparation was carried out by fuming with sulphuric acid followed by fluoride fusion of the remaining residue. The method was validated using the single laboratory approach by assessment of analytical performance characteristics like specificity, linearity, range, accuracy and precision. Spectral interferences were observed in the case of some heavy REE (Ho,Er,Tm) by light REE (Nd) and correction factors were deduced and applied. The limit of quantification, instrument linearity and the method range were evaluated. Relative standard deviation (RSD) values ranging from 2.6 to 10.2 % were obtained for repeatability studies and RSD values ranging from 1.7 to 11.1% for intra-lab reproducibility studies. Accuracy was established by application to a monazite certified reference material (CRM) and also through comparison of results obtained by present method with those obtained by an alternate method. The validation results were compliant with the acceptance criteria for the various parameters assessed. A simple procedure has been described for the estimation of associated measurement uncertainty using the GUM “bottom-up” modelling approach and results presented in this paper. The validated method was applied to the determination of REE, Y, Th and P in some monazite samples from India.
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In the present study, addition of nitroso group at position 1 of 2-aminoanthraquinone (1) to yield 2-amino-1-nitroanthraquinone (2) was carried out by the reaction of compound (1) with sodium nitrite in water. Compound (2) was used as starting material to produce many new naphtho[2,3-f] quinoxaline-dione, trione, naphtho-pyrazole quinoxaline-dione, anthra-triazine-dione, naphtho-thiazole quinoxaline-dione and anthrabenzo-triazepine-dione derivatives by elimination of one molecule of water as an initial reaction step. The reacting moieties were nitroso and amino function groups to yield a series of compounds. The structures of the products were determined by elemental mass, IR and 1H NMR analysis and the adopted method is efficient to prepare a series of compounds and could possibly be used for the synthesis of new compounds.
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In the present study, addition of nitroso group at position 1 of 2-aminoanthraquinone (1) to yield 2-amino-1-nitroanthraquinone (2) was carried out by the reaction of compound (1) with sodium nitrite in water. Compound (2) was used as starting material to produce many new naphtho[2,3-f] quinoxaline-dione, trione, naphtho-pyrazole quinoxaline-dione, anthra-triazine-dione, naphtho-thiazole quinoxaline-dione and anthrabenzo-triazepine-dione derivatives by elimination of one molecule of water as an initial reaction step. The reacting moieties were nitroso and amino function groups to yield a series of compounds. The structures of the products were determined by elemental mass, IR and 1H NMR analysis and the adopted method is efficient to prepare a series of compounds and could possibly be used for the synthesis of new compounds.
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Packaging in bread-making industry is one of priorities to satisfy the peculiar requirements of freshness in bread. A suitable packaging material allows for both rapid heat exchange with the environment and water vapour evaporation in order to prevent condensation inside the bread package. The effectiveness of some storage media/packaging materials in preventing bread spoilage under ambient temperature was studied. Bread staling, microbiological stability and organoleptic changes were evaluated as a function of storage time. The functional properties (water and oil absorption capacities and water oil absorption indices) of the bread were estimated .The water absorption capacity (WAC) of bread was in the range of 144-221 g/100 g sample, while the oil absorption capacity (OAC) range was 113-132 g/100 g. Water Oil Absorption Capacity (WOAI) for each of the packaging materials was < 2.0, which indicates the lipophilic nature. All the bread slices stored under different media/packaging materials, except perforated bowl and transparent plastic bowl exhibited sensory scores of 2.5 and above. Microbial growth manifested in bread kept in perforated and transparent plastic containers compared to the bread kept in cellophane and aluminum plate. This study clearly shows differences in the rates of staling, microbial stability and physical/chemical changes at different storage conditions.
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Aqueous extract of Thevetia peruviana leaves were investigated as corrosion inhibitor for API 5L X80 pipeline steel in 1M H2SO4 solution using electrochemical and gravimetric techniques. The results reveal that T. peruviana inhibited the X80 pipeline steel corrosion in the acid medium in a concentration dependent manner. Potentiodynamic polarization results showed T. peruviana to be a mixed type inhibitor in 1M H2SO4 environment, whereas the impedance results revealed adsorption of the inhibitor species on the steel surface. The gravimetric results reveal that the adsorption mechanism of the inhibitor on the steel surface was chemisorption. The adsorption was in accordance with Freundlich adsorption isotherm and negative standard adsorption energy (Δ𝐺o𝑎𝑑𝑠) obtained inferred that the adsorption was spontaneous and the interaction between the inhibitive molecules was found to be repulsive. Scanning electron microscopy (SEM) confirmed the formation of adsorbed film on the X80 pipeline steel surface. Results revealed that T. peruviana has potential to inhibit the correction and could possibly be used for corrosion inhibition in the acidic environment of steel.
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