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Tytuł:
Effect of monitoring strategies and reference data of the German Environmental Specimen Banking Program
Autorzy:
Paulus, M.
Bartel, M.
Klein, R.
Nentwich, K.
Quack, M.
Teubner, D.
Wagner, G.
Powiązania:
https://bibliotekanauki.pl/articles/147782.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
environmental specimen banking
effect monitoring
reference system
critical tissue concentration
bioaccumulation
biometric specimen characterization
Opis:
The constitution of the German Environmental Specimen Bank (ESB) has started in 1985, subsequent to a successful pilot study concerning the feasibility. Since that time, a multitude of technological and methodical standards have been developed, which allow for a high quality of the storage-samples and of the specimen characterization. While the storage-samples are kept for retrospective analysis, by now, already comprehensive data on the material-developing in the environment are available due to a real time monitoring of selected environmental chemicals over a period of up to twenty years. Thus, spatial and temporal trends can be described. Since the state of knowledge on critical tissue concentrations in the sublethal range is extremely low at present, it is however not possible to accomplish a direct assessment of relevancy of the substance concentrations. Hence, within the scope of the German ESB Program, the following strategies on assessment of relevancy are observed: use of biomarkers, histopathological examinations, biometric specimen characterization, use of ecological indicator groups, and development of a reference system with analytical and biometric data. Thus, for example endocrine effects in male breams in the river Saar, which correlate directly to operational discharges from municipal sewage plants, could be detected. By histopathological examinations, fibrotic and necrotic tissue adaptations on the gonads had been ascertained cumulatively, which unambiguously imply a restricted fertility of the male breams. In the river Rhine, an improved growth along the timeline could be described on the basis of biometric characterization of breams, which is regarded as rate for the reaction to all structural and material changes in the water body. Presently, with the development of a reference system based on the data collected in the scope of the Environmental
Źródło:
Nukleonika; 2005, 50,suppl.1; 53-58
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining strength of the modified wood
Autorzy:
Kyzioł, L.
Powiązania:
https://bibliotekanauki.pl/articles/258910.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
wood modification
wood-polymer composite
Iosipescu specimen
stress distribution in the specimen under load
Opis:
The article presents results of investigations of the effect of pinewood modification with methyl polymethacrylate on the anisotropy of its strength in complex stress conditions. The investigations aimed at determining the resistance of the examined wood to stretching, compression, stretching with shear, and compression with shear. For the investigations oriented on shear, shear with stretching, and shear with compression, a special specimen was prepared which differs by notch geometry from a typical Iosipescu specimen. A new test machine is described in the article, which is equipped with special specimen holders to perform investigations in complex stress conditions. Crack patterns recorded for the natural and modified wood are presented. For all tests, numerical FEM simulations were performed to obtain stress distributions inside the specimens. The calculated stress distributions were visualised as contour line projections for the natural and modified wood.
Źródło:
Polish Maritime Research; 2008, 2; 40-25
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Segmentation Based on Determinate Chaos of Histological Specimen Images
Autorzy:
Orel, V.
Gusynin, A.
Selezneva, H.
Kolesnik, S.
Stendyk, H.
Komisarova, H.
Powiązania:
https://bibliotekanauki.pl/articles/115899.pdf
Data publikacji:
2013
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
image analysis
segmentation
histological specimen
neuroblastoma
Opis:
Neuroblastoma is one of the most abundant tumors in infancy and ranks the fourth place among all malignant tumors of children, after acute leukemia, tumors of central nervous system and malignant lymphomas. Histological examination of atypical cell structures is mandatory for diagnosing and forecasting of neoplasm growth .. At present, the image processing of histological specimens is made by a professional histologist manually and is based on visual perception of the histologist. Naturally, visual approach has some shortcomings. Therefore, for objective estimation of medical images, increasing diagnosis accuracy and information processing speed, the computer analysis of histological images is a current need. In this paper, the features of the digital images of histological specimens and methods for digital analysis of medical images are presented. An innovative information system for instant diagnosis of the stage of neuroblastoma based on digital images analysis of histological specimens is developed. In presented studies, a new algorithm, based on deterministic chaos of digital images of histological specimens which uses original formalized indicators (irregularity of contoured zone of diagnostic interest, its structures heterogeneity including cells, nuclei, itochondrion etc.) have been implemented.
Źródło:
Challenges of Modern Technology; 2013, 4, 1; 3-8
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue life prediction of aluminium profiles for mechanical engineering
Autorzy:
Tomaszewski, T.
Sempruch, J.
Powiązania:
https://bibliotekanauki.pl/articles/281070.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
aluminium profile
high-cycles fatigue
mini specimen
size effect
Opis:
The study presents a method to determine the σa − N curve (high cycle fatigue) for profiles made of AW-6063 T6 aluminium alloy. Experimental material data for a mini specimen taken directly from the tested item and selected empirical correlations allowing for a size effect have been used. A model yielding the lowest relative error of estimating the fatigue life is presented.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 497-507
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of selected models of the size effect based on high-cycle fatigue testing on mini specimens made of EN AW-6063 aluminum alloy
Autorzy:
Tomaszewski, T.
Sempruch, J.
Piątkowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/279966.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
mini specimen
high-cycle fatigue
weakest link theory
fractal approach
Opis:
The study presents several cases where use of specimens with reduced overall dimensions, i.e. mini specimens in the course of fatigue tests is advantageous. The high-cycle fatigue tests based on a developed method have been performed on mini specimens and normative specimens (comparative tests). The tests have been conducted on EN AW-6063 aluminum alloy specimens. A correction coefficient determined as a result of monotonic tests and selected models of the size effect have been critically assessed based on the test results. A statistical Weibull’s weakest link model and a monofractal approach based on a fractal dimension have been verified.
Źródło:
Journal of Theoretical and Applied Mechanics; 2014, 52, 4; 883-894
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ductile fracture criterion for specimens with notches made of aluminium alloy EN-AW 2024
Autorzy:
Derpeński, Ł.
Seweryn, A.
Powiązania:
https://bibliotekanauki.pl/articles/280994.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
numerical analysis
fracture of specimen with notches
ductile fracture criterion
Opis:
The paper presents the experimental verification of the most frequently used ductile fracture criteria based on authors own experimental results and numerical calculations. Attention is drawn to the large discrepancy of results of fracture prediction and experimental data for six considered criteria. Based on own results, a new ductile fracture criterion for notched specimens is proposed. In the criterion, it is assumed that fracture initiation occurs when the maximum normal stress reaches a critical value depending on the maximum value of plastic shear strain.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 4; 1079-1093
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Middle Eocene ungulate mammals from Myanmar: a review with description of new specimens
Autorzy:
Tsubamoto, T
Egi, N.
Takai, M.
Sein, C.
Maung, M.
Powiązania:
https://bibliotekanauki.pl/articles/22438.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
new specimen
Myanmar
mammal
Middle Eocene
Eocene
Pondaung Formation
paleontology
Opis:
We review an ungulate mammalian fauna of the Eocene Pondaung Formation, central Myanmar, and herein describe new dental specimens. The taxa newly recognized in the Pondaung Formation are two indeterminate bunodont artiodactyls, two small “eomoropid” perissodactyls (Eomoropussp. cf. E. minimus and an indeterminate “eomoropid”), and a new deperetellid perissodactyl genus, Bahinolophus, which is established for Deperetella birmanica from the Pondaung Formation. The Pondaung ungulate fauna consists of 29 species (14 families and 18 genera): one species of an indeterminate small ungulate, 12 species (six genera in six families) of artiodactyls, and 16 species (11 genera in seven families) of perissodactyls. Although both Pondaung artiodactyls and perissodactyls are abundant and taxonomically diverse, the former are less diversified in generic numbers than the latter, but are nearly equal to the latter in abundance. Anthracotheriid artiodactyls and brontotheriid and amynodontid perissodactyls are the most abundant elements in the fauna. The estimated paleoecologies of the included taxa, the geologic and geographic evidence, and cenogram analysis suggest that the paleoenvironment of the Pondaung fauna was forested/woodland vegetation with humid/subhumid moisture and large rivers, which were located not far from the eastern Tethyan Sea. The age of the Pondaung fauna is independently correlated with the latest middle Eocene only on the basis of the stratigraphic, microfossil, and radiometric evidence, yielding a result consistent with mammalian faunal correlations. On the other hand, the Pondaung fauna includes many artiodactyl taxa compared to other middle Eocene faunas of East Asia and shows relatively high endemism at the generic level, implying that the Pondaung fauna is not formally included in the Eocene Asian Land Mammal “Ages” system.
Źródło:
Acta Palaeontologica Polonica; 2005, 50, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New specimens of the earliest European passeriform bird
Autorzy:
Mayr, G
Manegold, A.
Powiązania:
https://bibliotekanauki.pl/articles/20488.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Wieslochia weissi
new specimen
bird
Aves
Passeriformes
Oligocene
passeriform bird
paleontology
Opis:
We describe new specimens of the oldest European passeriform bird from the early Oligocene of Germany. This bird has hitherto been known only from a poorly preserved skeleton and we report here a second slab of the same specimen and an additional fragmentary skull. The new specimens allow the description of a new species, Wieslochia weissi gen. et. sp. nov., which lacks apomorphies of crown group Oscines, the taxon including most extant and all European passeriform species. In overall osteology, Wieslochia most closely resembles extant Suboscines but these similarities may be plesiomorphic for Passeriformes. W. weissi differs from the stem species pattern hypothesized for Eupasseres in the morphology of the distal carpometacarpus, the absence of a hooked processus acrocoracoideus (coracoid), and the presence of furrows instead of certain canals on the hypotarsus, and may even be outside crown group Eupasseres, the clade including Oscines and Suboscines. Because the earliest European fossil record of oscine passerines is from the late Oligocene, passerines outside crown group Oscines may have colonized Europe before the arrival of Oscines from the Australian continental plate.
Źródło:
Acta Palaeontologica Polonica; 2006, 51, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New specimens of the multituberculate mammal Uzbekbaatar from the Late Cretaceous of Uzbekistan
Autorzy:
Averianov, A O
Archibald, J.D.
Powiązania:
https://bibliotekanauki.pl/articles/22995.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
multituberculate
new specimen
mammal
Cretaceous
Late Cretaceous
Uzbekistan
Uzbekbaatar kizylkumensis
paleontology
Opis:
Uzbekbaatar Kielan−Jaworowska and Nessov, 1992 is among the rarest mammals and the only multituberculate in the diverse, eutherian dominated Bissekty (Turonian) and Aitym (?Coniacian) local faunas, Kyzylkum Desert, Uzbekistan. New material from the Bissekty local fauna, suggests that only one multituberculate species, Uzbekbaatar kizylkumensis Kielan−Jaworowska and Nessov, 1992 is present in the Bissekty fauna. A newly collected p4 is better preserved than the holotype and demonstrates presence of the posterolabial cusp in the p4 of Uzbekbaatar. New material of Uzbekbaatar is consistent with placement of this taxon within the basal cimolodontan “Paracimexomys group.”
Źródło:
Acta Palaeontologica Polonica; 2006, 51, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of a powerful energy flow effect on materials in PF-1000 installation
Autorzy:
Borowiecki, M.
De Chiara, P.
Dubrovsky, A. V.
Dyomina, E. V.
Gribkov, V. A.
Ivanov, L. I.
Maslyaev, S. A.
Mezzetti, F.
Miklaszewski, R.
Pimenov, V. N.
Pizzo, L.
Scholz, M.
Szydlowski, A.
Ugaste, Y. E.
Volobuev, I. V.
Powiązania:
https://bibliotekanauki.pl/articles/148824.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dense plasma focus (DPF)
irradiation
plasma jet
shock wave
test specimen
Opis:
The report describes some of the results obtained in an experimental study of the impact of a powerful plasma stream and a fast ion beam generated in a PF-1000 device on different materials perspective for the use in radiation loaded parts of pulsed plasma installations. Investigations were done during and after the interaction processes. It is shown that in case of irradiation of samples only by high power flux density plasma streams the effect of detachment still preserved. At the same time a low power flux density high-energy ion beam plays an important role in the process of saturation of the irradiated material by hydrogen.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 117-122
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of Specimens for Macro and Microscopic Examinations of Dissimilar Friction Welded Steel Joints and Their Evaluation According to Applicable Standards
Autorzy:
Ostromęcka, Małgorzata
Szymański, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2116439.pdf
Data publikacji:
2022
Wydawca:
Instytut Kolejnictwa
Tematy:
specimen preparation
macroscopic examination
microscopic examination
dissimilar joint
friction welded joints
Opis:
The article describes the issues related to the preparation for microscopic and macroscopic observation of dissimilar joints obtained by friction welding of 2H13 martensitic steel with B500B reinforcing steel. The results of etching and the main difficulties connected with the preparation of this type of samples for research were presented and discussed.
Źródło:
Problemy Kolejnictwa; 2022, 195; 129--133
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
W stronę książki idealnej. Projektowanie edycji na przykładzie twórczości Przemka Dębowskiego
Towards an ideal book: Edition design based upon works of Przemek Dębowski
Autorzy:
Dobijańska, Ilona
Powiązania:
https://bibliotekanauki.pl/articles/128599.pdf
Data publikacji:
2020
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Przemysłu Poligraficznego
Tematy:
projektowanie książek
okładka
typografia
krój pisma
book design
cover
typography
type specimen
Opis:
The article discusses problems of designing an ideal book, responding tocurrent market needs. It shows the design goals and difficulties in their fulfillment.Based on analysis of the works of Przemek Dębowski, an outstanding contempo-rary graphic designer, and his interview, attempts were made to obtain the rightmethod of graphical implementation. Important elements of work on the book anddesign decisions have been specified, showing them in the light of the enforcedrules, in particular the concept of congenial typography. It was emphasized that a well-designed book is an integrated whole of visual elements, each being equallyimportant. Dębowski’s views on design mechanisms, that deserve special attention,are summarized. At the same time, an idea is emphasized that the close cooperationof all the book's authors in order to obtain a reader-friendly edition is a value of its own.
Źródło:
Acta Poligraphica; 2020, 15; 35-48
2299-9981
Pojawia się w:
Acta Poligraphica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Fatigue Fracture Study on TDCB Aluminum Foam Specimen of Type Mode III Bonded with Adhesive
Autorzy:
Lee, J. H.
Cho, J. U.
Powiązania:
https://bibliotekanauki.pl/articles/356731.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum foam
fatigue fracture
fatigue analysis
load
Mode III type
specimen thickness
Opis:
This paper studies the characteristics of junction structure of closed-cell type aluminum foam, which is generally used as a shock absorber. TDCB specimens were designed for mode III type with thickness as a variable and performed a fatigue experiment on them by thickness. As the result, the load value of all specimens peaks under 0 to 25 cycles and decreases as the cycles increase. As the specimen thickens by 10 mm, the maximum load value is 1.2 times. When the thickness increases by 20 mm, the maximum value increases by 1.5 times. This study result can be utilized by investigating the mechanical characteristics of TDCB specimens for mode III type under fatigue loading conditions systematically and efficiently.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1359-1362
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extension of the concept of limit loads for 3D cases for a centrally cracked plate in tension
Rozszerzenie koncepcji obciążeń granicznych na przypadki trójwymiarowe dla płyty z centralną szczeliną poddanej rozciąganiu
Autorzy:
Graba, M.
Powiązania:
https://bibliotekanauki.pl/articles/280368.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
fracture mechanics
cracks
FEM
limits loads
load-line displacement
CC(T) specimen
Opis:
In the paper, the verification of the limit load solutions for a centrally cracked plate under tension (CC(T)) is presented using FEM calculations. Numerical calculations and analysis of the obtained FEM results were used to recalculation of the existing limit load formulas proposed by EPRI procedures for plane strain and plane stress. After verification of the EPRI solutions, three dimensional FEM calculation was done to determine the limit loads for 3D cases of CC(T) specimens. The measurable effect of the paper is a catalogue of numerical solutions and their approximations, which may be useful in the engineering analysis.
W pracy przedstawiono numeryczną weryfikację wzorów pozwalających wyznaczyć obciążenie graniczne dla przypadku płyty z centralną szczeliną poddanej rozciąganiu (próbka CC(T)) dla przypadków płaskiego stanu naprężenia i płaskiego stanu odkształcenia. W kolejnym kroku dokonano rozszerzenia koncepcji wyznaczania obciążeń granicznych na przypadki trójwymiarowe, uwzględniając efekt grubości, wykorzystując szereg trójwymiarowych obliczeń numerycznych. Uzyskane wyniki aproksymowano wzorami analitycznymi. Efektem wymiernym pracy jest katalog rozwiązań numerycznych i ich aproksymacji, pozwalający oszacować obciążenie graniczne dla trójwymiarowego elementu konstrukcyjnego (z uwzględnieniem grubości), bez konieczności prowadzenia czasochłonnych obliczeń numerycznych. Zaprezentowane w pracy wyniki mogą znaleźć zastosowanie w analizie inżynierskiej (np. analiza FAD lub analiza CDF).
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 2; 349-362
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metodyka badań zmęczeniowych z wykorzystaniem minipróbek - stanowisko, próbki, obciążenia i weryfikacja dla stopu EN AW-6063
Methods of fatigue tests using mini-specimens - testing machine, specimens, load and verification for EN AW-6063 aluminum alloy
Autorzy:
Tomaszewski, T.
Sempruch, J.
Powiązania:
https://bibliotekanauki.pl/articles/2072461.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
minipróbka
stop aluminium
zmęczenie wysokocyklowe
mini specimen
aluminum alloy
high-cycle fatigue
Opis:
Weryfikacja własności cyklicznych materiału w wielu przypadkach jest to niemożliwa z uwagi na ograniczenia wymiarowe badanych obiektów. Wówczas jednym z rozwiązań jest prowadzenie badań wykorzystujących próbkę mniejszą. W pracy przedstawiono badania porównawcze próbek normatywnych i minipróbek. Nieznacznie większy rozrzut wyników dla minipróbki w stosunku do próbki normatywnej sugeruje wiarygodność proponowanej metodyki.
Verification of material cyclic properties is not possible in many cases due to size limitations of tested objects. One possible solution is to conduct tests which would consider the smaller specimens. This paper presents a comparative study of normative and mini-specimens. Slightly higher spread of results obtained for mini-specimens compared to normative specimens suggests reliability of proposed methodology.
Źródło:
Inżynieria i Aparatura Chemiczna; 2013, 2; 120-121
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of selected mathematical models of high-cycle S-N characteristics
Autorzy:
Strzelecki, P.
Sempruch, J.
Tomaszewski, T.
Powiązania:
https://bibliotekanauki.pl/articles/298416.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
high-cycle fatigue
S-N curve
fatigue tests
number of specimen
steel strength
Opis:
The paper presents two approaches of determining S-N fatigue characteristics. The first is a commonly used and well-documented approach based on the least squares method and staircase method for limited fatigue life and fatigue limit, accordingly. The other approach employs the maximum likelihood method. The analysis of the parameters obtained through both approaches exhibited minor differences. The analysis was performed for four steel construction materials, i.e. C45+C, 45, SUS630 and AISI 1045. It should be noted that the quantity of samples required in the second approach is significantly smaller than with the first approach, which translates into lower duration and costs of tests.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2017, 20(3); 227-240
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New specimens of albanerpetontid amphibians from the Upper Cretaceous of Uzbekistan
Autorzy:
Skutschas, P.P.
Powiązania:
https://bibliotekanauki.pl/articles/22623.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Uzbekistan
paleontology
Cretaceous
Upper Cretaceous
amphibian
albanerpetontid amphibian
new specimen
fossil
Albanerpeton
Asia
Opis:
The albanerpetontid fossil record in Asia was limited to five dentaries of unidentified genus from the Upper Cretaceous Khodzhakul (lower Cenomanian) and Bissekty (Turonian) formations, Kyzylkum Desert, Uzbekistan. Here I describe two fragmentary frontals from the Khodzhakul local fauna as the first unequivocal record of the genusAlbanerpeton in Asia.
Źródło:
Acta Palaeontologica Polonica; 2007, 52, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of powerful pulses of hydrogen plasma upon materials in PF-1000 device
Autorzy:
Pimenov, V.
Gribkov, V.
Dubrovsky, A.
Mezzetti, F.
Scholz, M.
Ugaste, U.
Dyomina, E.
Ivanov, L.
Maslyaev, S.
Miklaszewski, R.
Borowiecki, M.
De Chiara, P.
Pizzo, L.
Szydlowski, A.
Volobuev, I. V.
Powiązania:
https://bibliotekanauki.pl/articles/147096.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dense plasma focus (DPF)
ion beam
irradiation
plasma jet
surface damage
test specimen
Opis:
The results of experimental investigations of powerful hydrogen plasma jets and fast ion beams interaction with various materials (austenitic chromium-manganese steels, pure vanadium, tungsten, graphite, copper, and their alloys: Cu-4 mass% Ni and Cu-10 mass% Ga) are presented. The materials were placed on the discharge axis of the PF-1000 device and irradiated with fluxes of fast ions (of energy in the range from tens keV up to several MeV) and with plasma streams (of power flux density q~(108 109) W/cm2). It was found that the fast ions and plasma streams caused different damages to the aforementioned materials. A diverse character of the damages to the individual investigated material was revealed. Some peculiarities of the process as well as the correlation between the surface density of the "macroscopic" structural defects (blisters and craters) and the fluence of the fast ions implanted in the specimen are discussed.
Źródło:
Nukleonika; 2002, 47, 4; 155-162
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the stress intensity factor of a compact specimen under the pre-compressed load condition
Autorzy:
Wu, Dongquan
Liu, Zixiang
Li, Dinghe
Zhang, Zhiqiang
Chen, Jianguo
Powiązania:
https://bibliotekanauki.pl/articles/2200862.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
pre-compressed load
residual stress
CT specimen
stress intensity factor
finite element method
Opis:
Structural components are often operated under combined stress conditions (primary and secondary stresses), but the stress levels generated by residual stress (or secondary stress) is hardly ever evaluated. Hence, stress intensity factors at the crack tips of a compact tension (CT) specimen under a pre-compressed load condition are analyzed using the finite element method. Then, the average residual stress intensity factor is calculated and analyzed. As the crack length α0/W increases, the average residual stresses σave/σ0 grows under the same pre-compression load. σave/σ0 increases rapidly at a low range of the pre-compression load but tends to a constant in a high range of the load. The distribution of the average residual stress intensity factors Kave and Κave/σ0 of the CT specimen with same crack length under different pre-compression loads have the same tendency. Additionally, the distribution of Κave and KFEM under different pre-compression loads are also similar. Nevertheless, Kave estimated by the average residual stress is too conservative and not accurate, and the method is complex, which depends on the analysis of simulation. Therefore, a simple method for calculating Mode I stress intensity factor K for this model is presented. A group of examples is presented to verify the accuracy of the method.
Źródło:
Journal of Theoretical and Applied Mechanics; 2023, 61, 1; 37--47
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on Propagation Property of Fatigue Crack at Composite with Another Material
Autorzy:
Choi, K. K.
Cho, J. U.
Powiązania:
https://bibliotekanauki.pl/articles/353600.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fatigue crack propagation
composite
matrix
another material
crack propagation
compact tension specimen CT
Opis:
In this study, the fatigue crack propagation in composite material is investigated by experimental result. When another material exists at fatigue crack propagation in case of composite, the durability against fatigue crack is smaller or greater than in case of matrix without another material. As another material is composite material, it refers to steel or material. Another material influences the crack propagation. As the experimental results can be agreed with simulation data, all experimental data in this study are verified. These experimental and analysis results can be applied into real field effectively. The estimation of safety design and life will be of great value industrially.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1363-1366
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie minipróbek do wyznaczania trwałości i wytrzymałości zmęczeniowej materiałów konstrukcyjnych
Use of mini specimens for determining the fatigue strength and fatigue life of structural materials
Autorzy:
Tomaszewski, T.
Sempruch, J.
Powiązania:
https://bibliotekanauki.pl/articles/95508.pdf
Data publikacji:
2014
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Tematy:
zmęczenie wysokocyklowe
minipróbka
krzywa σa-N
high-cycle fatigue
mini specimen
σa-N curve
Opis:
W pracy przedstawiono metodykę prowadzenia badań do wyznaczania własności zmęczeniowych materiału z wykorzystaniem minipróbek. Sformułowano hipotezy badawcze i metodykę badań. Wyniki analizowano w zakresie wpływu efektu skali.
This paper presents the research methodology for determining the fatigue properties of the material with the use of mini specimens. The hypotheses and research methodology were formulated. The results of size effect were analyzed.
Źródło:
Postępy w Inżynierii Mechanicznej; 2014, 4(2); 45-54
2300-3383
Pojawia się w:
Postępy w Inżynierii Mechanicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zakres normalizacji warunków badań zmęczeniowych minipróbek
Range standardization of fatigue testing conditions for mini specimens
Autorzy:
Tomaszewski, T.
Sempruch, J.
Powiązania:
https://bibliotekanauki.pl/articles/95514.pdf
Data publikacji:
2014
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Tematy:
zmęczenie wysokocyklowe
minipróbka
krzywa σa-N
high-cycle fatigue
mini specimen
σa-N curve
Opis:
W pracy scharakteryzowano procedurę prowadzenia badań zmęczeniowych w oparciu o normy. Przedstawiono geometrię próbek gładkich, warunki prowadzenia badań i opis wyników w formie charakterystyki zmęczeniowej σa-N. Jako praktyczną możliwość rozszerzenia zakresu identyfikacji własności zmęczeniowych materiału zaproponowano metodykę badań na minipróbkach.
The paper was characterized procedure for conducting fatigue tests based on the standards. The geometry of the smooth specimens, conditions of tests and description of the results (fatigue characteristics σa-N) was presented. As a practical opportunity to extend the scope of the identification of fatigue properties of the material proposed methodology for testing the mini specimens.
Źródło:
Postępy w Inżynierii Mechanicznej; 2014, 3(2); 59-66
2300-3383
Pojawia się w:
Postępy w Inżynierii Mechanicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors affecting the mechanical properties of compact bone and miniature specimen test techniques: a review
Autorzy:
Chittibabu, V.
Rao, S. K.
Rao, G. P.
Powiązania:
https://bibliotekanauki.pl/articles/103085.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mechanical properties
compact bone
miniature specimen
small punch test
finite element simulation
inverse finite element procedure
Opis:
This paper presents the review concerning mechanical properties of bone and the miniature specimen test techniques. For developing a realistic understanding of how factors such as moisture content, mineralization, age, species, location, gender, rate of deformation etc. affect the mechanical properties of bone, it is critical to understand the role of these factors. A general survey on existing research work is presented on this aspect. The essential features of miniature specimen test techniques are described, along with the application of small punch test method to evaluate the mechanical behavior of materials. The procedure for the determination of tensile and fracture properties, such as: yield strength, ultimate strength, ductility, fracture toughness etc. using small punch test technique have been described. The empirical equations proposed by various investigators for the prediction of tensile and fracture properties are presented and discussed. In some cases, the predictions of material properties have been essentially made through the finite element simulation. The finite element simulation of miniature specimen test technique is also covered in this review. The use of inverse finite element procedure for the prediction of uniaxial tensile constitutive behaviour of materials is also presented.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 32; 169-183
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rewitalizacja kroju pisma Brygada
Revitalising the Brygada typeface
Autorzy:
Tomaszewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/128549.pdf
Data publikacji:
2018
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Przemysłu Poligraficznego
Tematy:
krój pisma
matryca odlewnicza
czcionka
font komputerowy
digitalizacja
type specimen
casting matrix
font
computer font
digitalization
Opis:
In the collection of Łódź Book Art Museum, among the stored exhibits, unused matrices for casting fonts from before World War II have been discovered unexpectedly. Library and archival research, as well as comparative graphic research were carried out to determine the typeface provenance. It was established that the typeface family called Brygada was made in the Warsaw type foundry Jan Idźkowski and Co. on the occasion of the anniversary of Poland’s independence in1918. The Museum has prepared a casting machine for casting fonts from preserved matrices, and at the same time a team of graphic designers has digitized, supplemented the character set, and expanded the typeface family under the name Brygada 2018. Computer fonts were made available as public domain.
Źródło:
Acta Poligraphica; 2018, 11; 7-22
2299-9981
Pojawia się w:
Acta Poligraphica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Projekt cyfrowego wzornika krojów pism na urządzenia mobilne
The project of a mobile device digital type specimen based on Aquafadas software
Autorzy:
Kiełczewska, K.
Markowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/128561.pdf
Data publikacji:
2016
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Przemysłu Poligraficznego
Tematy:
wzornik czcionek
krój pisma
urządzenie mobilne
projektowanie graficzne
stencil fonts
type specimen
mobile device
graphic design
Opis:
In mobile media, there are many interesting apps about typography, but only few are equipped with tools that allow exploring the important role of typography in graphic design. This article presents several examples of digital typeface catalogues. Based on these examples and tools of Aquafadas DPS and Adobe InDesign software, an original app SPECIMEN for tablets has been created. For this purpose, 15 different typefaces have been chosen. The created app presents all the characteristics of type-faces and possibilities of their use. The E-catalogue also contains the information about the available license, which is important when planning the purchase. The information about the languages of prepared sets of characters is presented. An equally important part about the designers includes short biographical notes, lists other important typefaces designed by them and links to the websites where one can find many more interesting, completed projects. This project has been tested, and on the basis of it, there have been made a number of proposals and described advantages and disadvantages of the Aquafadas DPS software.
Źródło:
Acta Poligraphica; 2016, 8; 45-60
2299-9981
Pojawia się w:
Acta Poligraphica
Dostawca treści:
Biblioteka Nauki
Artykuł
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