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Wyświetlanie 1-15 z 1242
Tytuł:
Comparison finite element analysis on duralium strength against multistage artificial aging process
Autorzy:
Tsamroh, D.I.
Powiązania:
https://bibliotekanauki.pl/articles/2175783.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
mechanical properties
duralium
multistage artificial aging
finite element analysis
riveting
właściwości mechaniczne
wieloetapowe sztuczne starzenie
analiza elementów skończonych
nitowanie
Opis:
Purpose: To analyze and estimate the strength of duralium rivets which had been treated by using multistage artificial aging compared with duralium that had not been treated. This processwas necessary to be conducted in riveting process effectively. Duralium has been widely used in aerospace industry, one of duralium usage in aerospace industry is aircraft fittings such as rivet. Riveting is one of method that used for joining airframe structural components. During riveting process, the load transfer causing stress that led to the fatigue. Riveting process also causes deformation on the rivet and sheet metal. Deformation that occurs on the rivet will affect the performance of rivet structure. Thus, duralium rivet was analyzed its total deformation, shear stress, and its equivalent stress Von Misses. Design/methodology/approach: that used in this study was finite element analysis. Geometry of rivet that used in this study was drawn by using Autodesk Inventor Professional 2018. While total deformation, shear stress and equivalent stress Von Mises on duralium rivets were found out by using ANSYS Workbench 18.1. Findings: Comparison result was obtained between duralium rivet with and without treatment of multistage artificial aging. The result shown that total deformation, shear stress and equivalent stress Von Mises which obtained by duralium rivet with multistage artificial aging had the lower value than duralium rivet without multistage artificial aging. Duralium rivet with multistage artificial aging could be used as aircraft fitting which had the higher strength. Research limitations/implications: Direct experiment on duralium rivet had not been done yet, this study only did simulation based on data that obtained form previous research that had been conducted by the researcher. Practical implications: Duralium rivet with multistage artificial aging had lower value on total deformation, shear stress, and equivalent stress Von Misses, thus duralium rivet with multistage aritificial aging had a higher strength. Originality/value: Application of duralium as a rivet with treatment of multistage artificial aging.
Źródło:
Archives of Materials Science and Engineering; 2021, 109, 1; 29--34
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Traffic Noise Models for Curved Roads
Autorzy:
Popescu, D. I.
Cosma, I.
Powiązania:
https://bibliotekanauki.pl/articles/176976.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
traffic noise
noise source modelling
sound field
curved road
Opis:
The paper presents two theoretical models for traffic noise level distribution on curved horizontal roads. In the case of vehicles moving on a given route, one can consider, in terms of sound field, that the granular traffic is equivalent for short periods with a quasi-continuous noise flow. When computing and modelling the noise level generated by traffic on roads with complex trajectory, it is common to treat the route as a sum of small length road segments, each being assimilated with a linear noise source. This paper started from the assumption that the route can be decomposed into a sequence of linear and arc-shaped road segments, each of which is treated as a linear respectively curved noise source. An arc-shaped road segment is modelled by a tubular vibrating surface, of circular or rectangular section. In the case of rectangular section, the vibrating blade emits complex sounds on its both vertical sides and the generated sound field can be described more clearly, qualitatively and quantitatively, through intensity distribution. The theoretical models presented in the paper have direct application to the traffic noise prediction and noise maps drawing.
Źródło:
Archives of Acoustics; 2016, 41, 2; 309-314
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrides precipitation in Ti6Al4V titanium alloy used for airframe manufacturing
Autorzy:
Băilă, D. I.
Tonoiu, S.
Powiązania:
https://bibliotekanauki.pl/articles/200617.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hydrides precipitation
Ti6Al4V alloy
hydrogen embrittlement
pitting corrosion
wytrącanie wodorków
Stop Ti6Al4V
kruchość wodorowa
korozja wżerowa
Opis:
The aeronautical industry is a sector constantly looking for new materials and equipment because of its tendency to expand quickly. The Ti6Al4V titanium alloy is used frequently in the aeronautic, aerospace, automobile, chemical and medical industry because it presents high strength combined with low density (approximately 4.5 g/cm3), good creep resistance (up to 550°C), excellent corrosion resistance, high flexibility, good fatigue and biocompatibility. As a result of these properties, this titanium alloy is considered an excellent material for manufacturing structural parts in the aircraft industry for modern aeronautic structures, especially for airframes and aero-engines. But its use is also problematic because the Ti6Al4V titanium alloy manifests hydrogen embrittlement, by means of hydrides precipitation in the metal. The Ti6Al4V alloy becomes brittle and fractures because of hydrogen diffusion into metal and because titanium hydrides appear and create pressure from within the metal, thus generating corrosion. Because of titanium hydrides, the titanium alloy suffers from reduced ductility, tensile strength and toughness, which can result in fractures of aeronautical parts. This poses a very serious problem for aircrafts. In this paper, rapid hydrogen embrittlement is presented along with XRD, SEM and TEM analysis. Its goal is to detect the presence of titanium hydrides and to spot the initial cracks in the metallic material.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 3; 643-649
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The peculiarities of antioxidant-prooxidant balance of kidney’s papillary layer in skeletal and craniocerebral injuries and their combinations
Autorzy:
Merlev, D.I.
Gudyma, A.A.
Powiązania:
https://bibliotekanauki.pl/articles/1032377.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Kazimierza Wielkiego w Bydgoszczy
Tematy:
skeletal trauma
traumatic brain injury
multitrauma
kidney
lipid peroxidation
antioxidant protection
Opis:
Skeletal and craniocerebral injuries simulating and their combinations within the papillary layer of a kidney is leading to a significant shift of antioxidant-prooxidant ratio with prevailing Pro-oxidant mechanisms. These mechanisms are enlarging from the first to the seventh day of the posttraumatic period and significantly higher against the background of combined cranio-skeletal injuries on the 3rd and on the 7th day of post-traumatic period.
Źródło:
Journal of Health Sciences; 2014, 4, 1; 135-144
1429-9623
Pojawia się w:
Journal of Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bulbospinal catecholamine neurones and sympathetic pattern generation
Autorzy:
Coote, J H
Lewis, D.I.
Powiązania:
https://bibliotekanauki.pl/articles/70075.pdf
Data publikacji:
1995
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
catecholamine neuron
sympathetic pattern generation
brain tissue
preganglionic neuron
dopamine
noradrenaline
cardiovascular system
rat
Źródło:
Journal of Physiology and Pharmacology; 1995, 46, 3
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring the Reaction and Response of People to Urban Noise
Autorzy:
Popescu, D. I.
Moholea, I. F.
Powiązania:
https://bibliotekanauki.pl/articles/178048.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
urban noise
noise pollution
noise annoyance
social survey
Opis:
An important aspect in assessing noise in urban agglomerations is the subjective one, which takes into account the sensitivity and specific reactions of residents to the noise in their living environment. This paper presents results of a sociological study initiated to determine the population awareness, regarding the urban acoustic environment and estimation of effects and disturbance. The survey was conducted in a Romanian city, to complement the information provided by the strategic noise map of the area. This approach allows the estimation of specific local patterns of reaction and response to urban noise of the exposed population and provides the information, needed to develop action plans and to set proper solutions for urban area planning.
Źródło:
Archives of Acoustics; 2010, 35, 2; 237-244
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface layer desalination of the bays on the east coast of Novaya Zemlya identified by shipboard and satellite data
Autorzy:
Glukhovets, D.I.
Goldin, Y.A.
Powiązania:
https://bibliotekanauki.pl/articles/48910.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
surface layer
desalination
salinity
fluorescence
Kara Sea
Novaya Zemlya Archipelago
satellite data
Źródło:
Oceanologia; 2019, 61, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plutonium isotopes 238Pu, 239+240Pu, 241Pu and 240Pu/239Pu atomic ratios in the southern Baltic Sea ecosystem
Autorzy:
Struminska-Parulska, D.I.
Skwarzec, B.
Powiązania:
https://bibliotekanauki.pl/articles/47991.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
plutonium isotope
plutonium concentration
Baltic Sea
ecosystem
Chernobyl disaster
atmospheric fallout
marine sample
accelerator mass spectrometry
Opis:
The paper summarizes the results of plutonium findings in atmospheric fallout samples and marine samples from the southern Baltic Sea during our research in 1986–2007. The activities of 238Pu and 239+240Pu isotopes were measured with an alpha spectrometer. The activities of 241Pu were calculated indirectly by 241Am activity measurements 16–18 years after the Chernobyl accident. The 240Pu/239Pu atomic ratios were measured using accelerator mass spectrometry (AMS). The 241Pu activities indicate that the main impact of the Chernobyl accident was on the plutonium concentration in the components of the Baltic Sea ecosystem examined in this work. The highest 241Pu/239+240Pu activity ratio was found in sea water (140 ± 33). The AMS measurements of atmospheric fallout samples collected during 1986 showed a significant increase in the 240Pu/239Pu atomic ratio from 0.29 ± 0.04 in March 1986 to 0.47 ± 0.02 in April 1986.
Źródło:
Oceanologia; 2010, 52, 3; 499-512
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decision of the direct position problem of the joint relative manipulation mechanism with five degrees of freedom
Autorzy:
Pashchenko, V. N.
Meleshchenko, D. I.
Rashoyan, G. V.
Malyshev, D. I.
Kuzmina, V. S.
Powiązania:
https://bibliotekanauki.pl/articles/266251.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
kinematyka
niezawodność maszyn
manipulator równoległy
kinematics
machine reliability
parallel manipulator
Opis:
One of the mechanisms of joint relative manipulation with five degrees of freedom is considered. An approach to solving the direct positional problem is described. A simplified 3D model was created to verify the correctness of the solution. The results of a comparison of calculated and experimental data are presented.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 4; 1025-1033
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ground penetrating radar for underground sensing in agriculture: a review
Autorzy:
Liu, X.
Dong, X.
Leskovar, D.I.
Powiązania:
https://bibliotekanauki.pl/articles/26587.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Opis:
Belowground properties strongly affect agricultural productivity. Traditional methods for quantifying below- ground properties are destructive, labor-intensive and point-based. Ground penetrating radar can provide non-invasive, areal, and repeatable underground measurements. This article reviews the application of ground penetrating radar for soil and root measurements and discusses potential approaches to overcome challenges facing ground penetrating radar-based sensing in agriculture, especially for soil physical characteristics and crop root measurements. Though advanced data-analysis has been developed for ground penetrating radar-based sensing of soil moisture and soil clay content in civil engineering and geosciences, it has not been used widely in agricultural research. Also, past studies using ground penetrating radar in root research have been focused mainly on coarse root measurement. Currently, it is difficult to measure individual crop roots directly using ground penetrating radar, but it is possible to sense root cohorts within a soil volume grid as a functional constituent modifying bulk soil dielectric permittivity. Alternatively, ground penetrating radar-based sensing of soil water content, soil nutrition and texture can be utilized to inversely estimate root development by coupling soil water flow modeling with the seasonality of plant root growth patterns. Further benefits of ground penetrating radar applications in agriculture rely on the knowledge, discovery, and integration among differing disciplines adapted to research in agricultural management.
Źródło:
International Agrophysics; 2016, 30, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocenka zhivuchesti otdelno stojashhikh fundamentov na osnove izuchenija processa ikh razrushenija
Evaluate the survivability of a detached foundation based study of their destruction
Autorzy:
D'jakov, I.
Powiązania:
https://bibliotekanauki.pl/articles/78034.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
survivability
foundation
building resistance
destruction
geometrical characteristics
structure
design
bearing capacity
strength characteristics
experimental study
Opis:
Survivability foundation plays an important role in building resistance to the progressive destruction. This should be taken into account in the relevant calculations. Experimental studies of free-standing foundations have identified stages of structural collapse. Determine the ratio of the breaking load and the calculated bearing capacity. Reserve of vitality depends on the foundations of a large number of factors: the geometric characteristics of the structure, the design features, the strength characteristics of the materials, the eccentricity of external forces and others.
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 5
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nekotorye osobennosti primenenija podkhodov edinichnojj zhivuchesti k ocenke svajjhykh uderzhivajushhikh sooruzhenijj
Application of the approach of unit vitality to evaluate the survivability of the pile restraint of structures
Autorzy:
D'jakov, I.
Powiązania:
https://bibliotekanauki.pl/articles/76907.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
survivability
pile retaining structure
persistence
destruction
building
soil mass
calculation model
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 5
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Restoring the dignity of the nursing and midwifery professions in a confrontation with the psychological and psychiatric consequences of a terrorist attack on the human body
Autorzy:
Mazurkiewicz, D.W.
Piechocka, D.I.
Strzelecka, J.
Powiązania:
https://bibliotekanauki.pl/articles/1918529.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
y. Keywords: Mental disorders
terrorism
public health
scope of practice
symptoms.
Opis:
On October 9-10, 2017, the International Scientific Conference „Polish, European and Global Nursing” was held in Warsaw, Poland. The main organizer of the conference was the National Council of Nurses and Midwives in Warsaw. The event was an excellent opportunity to seriously discuss the situation of nurses and midwives and other topics in a large group of experts, pondering such issues as how to restore the dignity and prestige of the profession, and also how to initiate a discussion on the psychological and psychiatric consequences of a terrorist attack on the human body.
Źródło:
Progress in Health Sciences; 2017, 7(2); 131-133
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical solutions for the control and command system of a Plasma Focus device
Autorzy:
Martin, D. I.
Zoita, V. I.
Cotruta, D. A.
Jianu, A. V.
Ighigeanu, D. I.
Bestea, V. I.
Powiązania:
https://bibliotekanauki.pl/articles/147621.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
control system
electromagnetic transients
galvanic separation
plasma focus
Opis:
The paper presents the technical problems related to the electrical control and command system (ECC system) for the plasma focus installation IPF-4/5A having the following main parameters: 1 MA plasma current and 40 kJ energy stored at 20 kV charging voltage. The ECC system applies 23 interlocked logical commands, acquires and processes 28 logical states, acquires, processes and displays continuously the main slow-varying signals coming from IPF-4/5A subassemblies. All the plasma focus installation operational sequences are governed by strict hard and soft interlocking using in parallel two control and command systems: one based on PC-control methods and another based on classical control techniques.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 89-91
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1242

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