Autor: Santos, J. M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Eddy Current System for Complex Geometry Inspection in High Speed Application
System wiroprądowy do kompleksowej kontroli geometrii w zastosowaniach z dużą prędkością
Autorzy:: Camerini, C.
Rebello, J. M. A.
Braga, L.
Santos, R.
Santos, J. M.
Pereira, G.
Powiązania:: https://bibliotekanauki.pl/articles/107878.pdf
Data publikacji:: 2018
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: fatigue crack
weld root
eddy current testing
in-line inspection tool
pęknięcie zmęczeniowe
rdzeń spawu
testowanie wiroprądowe
jednostka kontroli inline
Opis:: Rigid pipelines installed in offshore structures for oil and gas production are built from pipe sections connected by circumferential welds. Such welds are generally points of stress concentration and therefore the regions that most demand periodic inspection. The weld geometry and the inspection speed required for in service inspection are the main challenges associated to the inspection procedure. In the present work an eddy current transducer with sensing coils placed orthogonally and connected in differential mode was introduced to evaluate fatigue cracks in weld root. A dedicated embedded electronic hardware was developed to drive the transducer and measure the electrical complex impedance of the coils and was specifically designed for operation under autonomous in-line inspection tool in a speed range between 0.5 – 1.0 m/s. The achieved results have confirmed that the introduced eddy current transducer is a potential solution for fatigue crack detection in irregular surfaces like weld root, while the hardware developed presented a reasonable SNR and achieved the data rate required to be incorporated in an autonomous in-line inspection tool.
Sztywne rurociągi instalowane w morskich konstrukcjach do produkcji ropy i gazu budowane są z odcinków rur połączonych spoinami obwodowymi. Takie spoiny są zwykle punktami koncentracji naprężeń, a zatem regionami, które w największym stopniu wymagają okresowej kontroli. Geometria spoiny i prędkość kontroli wymagana do przeprowadzenia badania serwisowego stanowią główne wyzwania związane z procedurą inspekcji. W niniejszej pracy, w celu oceny pęknięć zmęczeniowych w rdzeniu spoiny, zaproponowano przetwornik wiroprądowy z cewkami pomiarowymi umieszczonymi ortogonalnie i połączonymi różnicowo. Opracowano specjalny wbudowany system elektroniczny do sterowania przetwornikiem i pomiaru impedancji złożonych cewek elektrycznych. System został zaprojektowany specjalnie do pracy jako autonomiczna jednostka inspekcji linii w zakresie prędkości od 0,5 do 1,0 m/s. Uzyskane wyniki potwierdziły, że wprowadzony przetwornik wiroprądowy jest potencjalnym rozwiązaniem umożliwiającym wykrywania pęknięć zmęczeniowych na nieregularnych powierzchniach, takich jak rdzeń spoiny. Ponadto opracowany sprzęt zapewnia odpowiedni współczynnik stosunku sygnału do szumu SNR i osiąga prędkość transmisji wymaganą dla zastosowania w jednostkach niezależnej kontroli w linii.
Źródło:: Badania Nieniszczące i Diagnostyka; 2018, 2; 6-10
2451-4462
2543-7755
Pojawia się w:: Badania Nieniszczące i Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: An adaptive hybrid metaheuristic for permutation flowshop scheduling
Autorzy:: Moccellin, J.
Santos, M.
Powiązania:: https://bibliotekanauki.pl/articles/206870.pdf
Data publikacji:: 2000
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:: flowshop sequencing
hybrid metaheuristics
simulated annealing
tabu search
Opis:: In this paper we present a hybrid Tabu Search - Simulated Annealing heuristic fox the minimal makespan flowshop sequencing problem. In order to evaluate the effectiveness of the hybridization we compare the hybrid metaheuristic with pure Tabu Search and Simulated Annealing heuristics. The results from computational experience are discussed.
Źródło:: Control and Cybernetics; 2000, 29, 3; 761-771
0324-8569
Pojawia się w:: Control and Cybernetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: DSPIC - Based impedance measuring instrument
Autorzy:: Santos, J.
Ramos, P. M.
Powiązania:: https://bibliotekanauki.pl/articles/220477.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: impedance measurement
dsPIC
ADC
sine-fitting
Opis:: An implemented impedance measuring instrument is described in this paper. The device uses a dsPIC (Digital Signal Peripheral Interface Controller) as a processing unit, and a DDS (Direct Digital Synthesizer) to stimulate the measurement circuit composed by the reference impedance and the unknown impedance. The voltages across the impedances are amplified by programmable gain instrumentation amplifiers and then digitized by analog to digital converters. The impedance is measured by applying a seven-parameter sine-fitting algorithm to estimate the sine signal parameters. The dsPIC communicates through RS-232 or USB with a computer, where the measurement results can be analyzed. The device also has an LCD to display the measurement results.
Źródło:: Metrology and Measurement Systems; 2011, 18, 2; 185-198
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Do combinations of insecticides and acaricides influence spray droplet formation and the interaction with citrus leaves?
Autorzy:: Della Vechia, J.F.
Santos, R.T.
Griesang, F.
Santos, C.M.
Ferriera, M.C.
Andrade, D.J.
Powiązania:: https://bibliotekanauki.pl/articles/2084816.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: contact angle
coverage efficiency
droplet size
surface tension
tank mixture
Opis:: In agriculture, the mixing of pesticides in tanks is a common practice. However, it is necessary to previse possible physical-chemical implications of this practice, which may affect the efficiency of the treatments performed. Therefore, the objective of this study was to evaluate the effects of the addition of acaricide to insecticidal spray mixtures on the formation of spray droplets and the interaction with citrus leaves. The experimental design was totally randomized, in a (2 × 3 + 1) factorial scheme for seven treatments. Factor A corresponded to the spray mixture used (isolate or in the mixture). Factor B corresponded to the insecticides tested (lambda-cyhalothrin + thiamethoxam, phosmet, and imidacloprid) and the control consisted of a spray mixture with spirodiclofen only. Nine replications were performed for characterization of the spray droplet size spectrum and four replications for the analysis of the surface tension and the contact angle. The mixture of pesticides showed positive results in terms of application safety. The addition of acaricide to insecticide spray mixtures reduced the surface tension and contact angle of droplets on the adaxial surface of orange leaves. There was an increment in volume median diameter (VMD), a significant reduction in the volume of droplets with drift-sensitive size and improvement in the uniformity of droplet size. Therefore, the addition of acaricide to an insecticide spray mixture positively influenced spray droplet formation and the interaction with citrus leaves providing better coverage and droplet size fractions with an appropriate size for safe and efficient application.
Źródło:: Journal of Plant Protection Research; 2019, 59, 4; 487-493
1427-4345
Pojawia się w:: Journal of Plant Protection Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Electron Transmission through Graphene Bilayer Flakes
Autorzy:: Chico, L.
González, J.
Santos, H.
Pacheco, M.
Brey, L.
Powiązania:: https://bibliotekanauki.pl/articles/1419511.pdf
Data publikacji:: 2012-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.22.-f
73.63.-b
Opis:: We investigate the electronic transport properties of a bilayer graphene flake contacted by two monolayer nanoribbons. This finite-size bilayer flake can be built by overlapping two semi-infinite ribbons. We study and analyze the electronic behavior of this structure by means of a tight-binding method and a continuum Dirac model. We have found that the conductance oscillates markedly between zero and the maximum value of the conductance, allowing for the design of electromechanical switches.
Źródło:: Acta Physica Polonica A; 2012, 122, 2; 299-303
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Etching Method to Create Random Speckle Pattern on Semi-Solid Cast A356 Aluminium for DIC in-situ strain measurement
Autorzy:: Sergolle, M.
Santos, J.
Kasvayee, K. A.
Jarfors, A. E. W.
Powiązania:: https://bibliotekanauki.pl/articles/106925.pdf
Data publikacji:: 2017
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: random speckle pattern
cast semi-solid aluminum alloy
pit etching
pitting corrosion
Digital Image Correlation (DIC)
local strain
Opis:: Aluminum semi-solid casting is constantly evolving, as it offers a combination of reduced shrinkage porosity and gas entrapment defects together with high productivity and an extended die-life. The relationship between the microstructure and stress-strain behavior is not well-understood due to its non-conventional microstructure. In-situ tensile testing, combined with optical microscope and Digital Image Correlation (DIC), has been used for local strain distribution measuements in cast irons. The critical capability was an etching technique to generate a micro-scale random speckle pattern with a sufficiently high speckle density to enable the sufficient spatial resolution of displacement and strain. The current paper focuses on the development of a pit etching procedure for the semi-solid cast A356 aluminum alloy to study local strain accommodation on the microstructure during tensile loading. The critical challenge of this procedure was the generation of homogeneously distributed pits on both the primary aluminum and eutectic regions. Therefore, a heated solution used for wet-etch aluminum in microfabrication was modified as well as a process adapted to generate pits with suitable characteristics. In-situ tensile tests were performed attached to an optical microscope to record the microstructure and displacements during loading. DIC software was used for analysis. The procedure was validated through a comparison between the resulting Young´s moduls using standard tensile testing and the DIC process on the speckle pattern generated. A good fit between the two methods for Young´s modulus was found. The spatial resolution obtained was, however, not sufficient to fully resolve the strain gradients in the microstructure, but it did reveal large strain variations in the microstructure.
Źródło:: Journal of Casting & Materials Engineering; 2017, 1, 1; 33-38
2543-9901
Pojawia się w:: Journal of Casting & Materials Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Geomorphic dynamics of gullies developed in sandy slopes of Central Spain
Autorzy:: Lucía, A.
Martín-Duque, J. F.
Laronne, J. B.
Sanz-Santos, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/294675.pdf
Data publikacji:: 2011
Wydawca:: Stowarzyszenie Geomorfologów Polskich
Tematy:: sand
gullies
Terrestrial Laser Scanner (TLS)
Reid bedload sampler
erosion-runoff plots
Spain
Opis:: Gullies developed on sandy lithologies are scarce. Such landforms have developed in the sandy deposits of the Cretaceous 'Utrillas' facies within the Segovia province of Central Spain. They appear at the slopes of a group of mesas and cuestas located at the edge of the northern piedmont of the Guadarrama Mountains of the Spanish Central System. The activity of the different geomorphic processes acting in these gullies, as well as their connectivity, are being characterized and quantified. This study was preceded by reconnaissance methods, whereas presently technologically advanced and more accurate techniques are being utilized. The new methods are applied in an experimental catchment (1.26 ha). They include: i) an automatic Reid-type (formerly termed Birkbeck) slot bedload sampler for continuous monitoring of bedload flux and for continuous sampling of bedload; siphons for sampling the suspended load; and a Parshall flume to monitor water discharge. Jointly, these instruments allow to study the fluvial dynamics at the catchment mouth; ii) topographic surveys undertaken by a Terrestrial Laser Scanner (TLS) to quantify the activity of gravitational, overland flow and fluvial processes in different sediment source areas within the gully basin; iii) micro runoff and erosion plots to monitor the infiltration and erosive response of different Hydrologic Response Units (HRU) comprising the interior of the catchment. This ensemble of novel methods has started providing patterns of sediment movement within the gully system.
Źródło:: Landform Analysis; 2011, 17; 91-97
1429-799X
Pojawia się w:: Landform Analysis
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Helminth parasites in some Spanish bats
Helminty pasożytujące w niektórych hiszpańskich nietoperzach
Autorzy:: Alvarez, F.
Rey, J.
Quinteiro, P.
Iglesias, R.
Santos, M.
Sanmartin, M.L.
Powiązania:: https://bibliotekanauki.pl/articles/837235.pdf
Data publikacji:: 1991
Wydawca:: Polskie Towarzystwo Parazytologiczne
Opis:: Nineteen bats of the species Rhinolophus ferrumequinum, R. hipposideros, Myotis myotis, M. nattereri, Pipistrellus pipistrellus, Barbastella barbastellus, Eptesicus serotinus and Plecotus auritus captured in N. W. Spain in 1983 - 85 were found to contain the following helminth parasites: Mesotretes peregrinus (found in 4 host species and making up 31% of all helminths); Plagiorchis vespertilionis (10.5%, in 2 host spiecies); Strongylacantha glycirrhiza, Molinostrongylus alatus, Molineidae gen. sp., Capillariidae gen. sp., Hymenolepis acuta, Cestoda gen. sp. and Trematoda gen. sp. I and II (5.2% in 1 host species).
Źródło:: Annals of Parasitology; 1991, 37, 3
0043-5163
Pojawia się w:: Annals of Parasitology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Helminth parasites in some Spanish bats
Helminty pasożytujące w niektórych hiszpańskich nietoperzach
Autorzy:: Alvarez, F.
Rey, J.
Quinteiro, P.
Iglesias, R.
Santos, M.
Sanmartin, M.L.
Powiązania:: https://bibliotekanauki.pl/articles/2152384.pdf
Data publikacji:: 1991
Wydawca:: Polskie Towarzystwo Parazytologiczne
Opis:: Nineteen bats of the species Rhinolophus ferrumequinum, R. hipposideros, Myotis myotis, M. nattereri, Pipistrellus pipistrellus, Barbastella barbastellus, Eptesicus serotinus and Plecotus auritus captured in N. W. Spain in 1983 - 85 were found to contain the following helminth parasites: Mesotretes peregrinus (found in 4 host species and making up 31% of all helminths); Plagiorchis vespertilionis (10.5%, in 2 host spiecies); Strongylacantha glycirrhiza, Molinostrongylus alatus, Molineidae gen. sp., Capillariidae gen. sp., Hymenolepis acuta, Cestoda gen. sp. and Trematoda gen. sp. I and II (5.2% in 1 host species).
Źródło:: Wiadomości Parazytologiczne; 1991, 37, 3; 321-329
0043-5163
Pojawia się w:: Wiadomości Parazytologiczne
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Directional Ordering in Amorphous $Fe_{43}Ni_{43}Zr_7Cu_1B_6$ Ferromagnetic Alloys
Autorzy:: Varga, M.
Varga, R.
Vojtaník, P.
Hernando, B.
Prida, V.
Santos, J.
Pérez, M.
Powiązania:: https://bibliotekanauki.pl/articles/1533987.pdf
Data publikacji:: 2010-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Kj
75.60.Nt
Opis:: Development of the atomic directional ordering in the $Fe_{43}Ni_{43}Zr_7Cu_1B_6$ alloy, during its conventional the same as after transverse magnetic field annealing, was experimentally studied by the amplitude dependence of susceptibility and hysteresis loops measurements, respectively. Diffusion processes of the mobile atoms caused perminvar effect, decrease of the initial susceptibility, increase of the critical field, and linear shape of the hysteresis loop. Uniaxial magnetic anisotropy, created during magnetic field annealing of the FeNiZrCuB alloy, was confirmed also by observation of the surface domain structure.
Źródło:: Acta Physica Polonica A; 2010, 118, 5; 804-806
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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