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Tytuł:
Generative shaping in search of material and structural optimisation of small structural forms
Wykorzystanie projektowania generatywnego do optymalizacji wielkościowej małych form konstrukcyjnych
Autorzy:
Stefańska, A.
Liszewska, K.
Kurcjusz, M.
Jeleniewicz, K.
Das, R.R.
Powiązania:
https://bibliotekanauki.pl/articles/28765655.pdf
Data publikacji:
2023
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Acta Scientiarum Polonorum. Architectura; 2023, 22; 138-147
1644-0633
Pojawia się w:
Acta Scientiarum Polonorum. Architectura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrodynamic forces on a submerged horizontal circular cylinder in uniform finite depth ice covered water
Autorzy:
Sahu, M.
Das, D.
Powiązania:
https://bibliotekanauki.pl/articles/1839795.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fala powierzchniowa
elektrodynamika
dyfrakcja fal
wave scattering
hydrodynamic forces
submerged cylinder
ice-covered water
Opis:
Hydrodynamic forces on a submerged cylinder in uniform finite depth ice-covered water is formulated by using the method of multipoles, the ice-cover being modelled as an elastic plate of very small thickness. The forces (vertical and horizontal) are obtained analytically as well as numerically and depicted graphically for various values of flexural rigidity of the ice-cover to show the effect of its presence. When the flexural rigidity and surface density of the ice-cover are taken to be zero, then the curves for the forces almost coincide with the curves for the case of uniform finite depth water with free surface.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 219-227
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In-situ formed, ultrafine Al-Si composite materials: ductility
Autorzy:
Guba, P.
Gesing, A.
Sokolowski, J.
Conle, A.
Sobiesiak, A.
Das, S.
Kasprzak, M.
Powiązania:
https://bibliotekanauki.pl/articles/366887.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
ultrafine Al-Si composite
Al metal matrix
hypereutectic Al alloys
mechanical properties
high ductility
osnowa metalowa
stop nadeutektyczny
właściwości mechaniczne
ciągliwość
Opis:
Purpose: The work objective includes optimization of the casting production and heat treatment processes that will simultaneously maximize the combination of strength, hardness, and ductility for hypereutectic Al-Si compositions with Si volume fractions of as much as 25 vol.%. In addition, such an in-situ formed composite alloy will attain a unique combination of low production cost, high potential recycled content, and functional characteristics suitable for mission critical aerospace and vehicular applications. Design/methodology/approach: The unique High Pressure Die Casting Universal Metallurgical Simulator and Analyser (HPDC UMSA) was used for melting, cyclic melt treatment, and solidification of the hypereutectic Al-Si-X (A390). The produced as-cast structures contained colonies of nano-diameter Si whiskers and other morphologies, and absence of primary silicon particles. Heat treated structures rendered nano and ultrafine metal matrix composites. Findings: New developed as-cast Al-Si materials containing nano-diameter Si whiskers, without primary silicon particles required ultra short time heat treatment to result in nano and ultrafine metal matrix composite, rendering their hardness, strength and wear resistance, and the same time retaining toughness and ductility. Research limitations/implications: The cast samples were produced in laboratory conditions and potential tensile strength was estimated from empirical correlation with micro-hardness measurements. In the future, the comprehensive mechanical properties need to be tested. Practical implications: These ultrafine Si, Al-MMCs can be net-shape formed by modified HPDC technology or consolidated from spray-atomized alloy powder. Originality/value: Optimization of the entire production process for the hypereutectic Al-Si alloy compositions achieved a uniform distribution of ~ 25 vol.% of ultrafine Si particles in ductile FCC-Al matrix further reinforced by age hardening with nano-scale spinodal GP-zones. The associated mechanical property and ductility improvements will open a wide range of critical lightweighting components in transportation: aerospace, terrestrial vehicle and marine to the optimized hypereutectic Al-Si alloys. Presently, these components do not use the commercial HPDC A390 alloys due to their limited ductility and strength. Proposed new technology will allow conversion of various cast airspace alloys with ultrahigh mechanical properties to the automotive applications.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2019, 92, 1-2; 5-12
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extended warranty of medical equipment subject to imperfect repairs: an approach based on generalized renewal process and Stackelberg game
Rozszerzona gwarancja na sprzęt medyczny podlegający niepełnym naprawom: podejście oparte na uogólnionym procesie odnowy i modelu Stackelberga
Autorzy:
de Santana, J. M. M.
Santiago, R. L. V.
Moura, M das C.
Lins, I. D.
Powiązania:
https://bibliotekanauki.pl/articles/301400.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
medical equipment
extended warranty
Stackelberg game
generalized renewal process
sprzęt medyczny
rozszerzona gwarancja
gra Stackelberga
uogólniony proces odnowy
Opis:
Due to its advanced technology, maintenance services of healthcare equipment have been commonly executed by the original equipment manufacturer (OEM), which can be characterized as a monopolist. In this context, hospitals require high availability of their equipment at a reasonable servicing cost, whereas OEM aims to maximize its profit by selling extended warranty (EW) services for multiple consumers. The issue of drawing a maintenance contract between OEM and hospitals has already been treated by adopting a Stackelberg’s game. However, the “as good as new” and “as bad as old” assumptions are usually considered, which are rather difficult to observe in practice, especially for healthcare institutions and their technology-intensive equipment. Thus, we here adopt generalized renewal processes (GRP) for modelling imperfect repairs, and we develop a discrete event simulation method for finding the best strategies of each player: OEM sets the prices for EW and on-demand maintenance that optimize its profit, while hospitals choose which option they should hire. We also present an application example with real data gathered from an angiography device, which is used for mapping blood vessels and diagnosing heart diseases.
Ze względu na zaawansowanie technologiczne sprzętu medycznego, jego obsługą serwisową zazwyczaj zajmuje się producent sprzętu oryginalnego (OEM), co czyni go monopolistą w tym zakresie. Podczas gdy szpitalom zależy na wysokiej gotowości sprzętu przy rozsądnych kosztach obsługi, OEM dąży do maksymalizacji zysku poprzez sprzedaż rozszerzonej gwarancji na usługi serwisowe wielu klientom. Istnieją już badania, w których kwestię zawierania umowy o świadczenie usług serwisowych między OEM a szpitalami analizowano z zastosowaniem modelu Stackelberga. Jednak zwykle badania te zakładają, że stan po naprawie może być albo "jak fabrycznie nowy" albo"jak przed uszkodzeniem", co rzadko spotyka się w praktyce, zwłaszcza w przypadku placówek służby zdrowia i ich zaawansowanego technologicznie sprzętu. W związku z tym, w przedstawionej pracy, przyjęto uogólniony proces odnowy (GRP) do modelowania niepełnych napraw oraz opracowano metodę symulacji zdarzeń dyskretnych w celu znalezienia najlepszych strategii dla każdego gracza: OEM ustala ceny rozszerzonej gwarancji oraz konserwacji na żądanie, tak by zoptymalizować swój zysk; szpital natomiast ustala, którą opcję powinien wybrać. W pracy przedstawiono również przykład zastosowania omawianego podejścia z wykorzystaniem rzeczywistych danych zebranych z angiografu, który służy do obrazowania naczyń krwionośnych i diagnozowania chorób serca.
Źródło:
Eksploatacja i Niezawodność; 2018, 20, 4; 567-578
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flexural Behaviour of Fibre Reinforced Concrete Beams with Different Aspect Ratios
Właściwości mechaniczne betonu wzmocnionego włóknami stalowymi i polipropylenowymi
Autorzy:
Baskar, K.
Elangovan, G.
Das, K. M.
Powiązania:
https://bibliotekanauki.pl/articles/233053.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
hybrid
steel fibres
polypropylene fibre
RC element
flexural strength
włókna hybrydowe
włókna stalowe
włókna polipropylenowe
wytrzymałość na zginanie
Opis:
The performance of conventional concrete is enhanced by the addition of fibres in concrete. Consequently the brittleness in concrete is reduced, and its acceptable ductility is also ensured by this addition. In this paper the strength of concrete cubes, cylinders and beams cast using M25 grade concrete and reinforced with steel and polypropylene fibres is presented. Also hybrid fibres with crimped steel and polypropylene were used in a concrete matrix to study improvements in the strength properties of steel, polypropylene and hybrid polypropylene as well as steel (crimped) fibres of various proportion i.e., 0.25%, 0.5%, 0.75%, 1% and 0.5% (0.25% of steel and 0.25% of polypropylene), 0.75% (0.5% of steel and 0.25% of polypropylene, 0.25% of steel and 0.5% of polypropylene) and 1% of various combinations of hybrid fibres for 7,14 and 28 days. The main reason for synthetic fibres in the concrete matrix is to improve the post cracking response of the concrete to improve the energy absorption capacity and ductility as well as to provide crack resistance and control. The introduction of this type of concrete was brought in as a solution to develop concrete with enhanced flexural and tensile strength. In this paper we analysed and present a comparison between conventional concrete and fibre reinforced concrete, leading to a crack free structure.
W pracy zbadano właściwości mechaniczne betonu wzmocnionego włóknami stalowymi i polipropylenowymi. Przedstawiono wyniki badań wytrzymałości kostek, cylindrów i belek wykonanych z czystego betonu i betonu wzmocnionego włóknami stalowymi i polipropylenowymi. Zastosowano również włókna hybrydowe z karbikowaną stalą i polipropylenem w matrycy betonowej w celu zbadania poprawy właściwości wytrzymałościowych. Użyto włókien w różnych proporcjach tj. 0,25%, 0,5%, 0,75%, 1% i 0,5% (0,25% stali i 0,25% polipropylenu), 0,75% (0,5% stali i 0,25% polipropylenu, 0,25% stali i 0,5% polipropylenu) oraz 1% różnych kombinacji włókien hybrydowych. Zastosowanie włókien syntetycznych w matrycy betonowej poprawiło zdolność pochłaniania energii, a co za tym idzie spowodowało polepszenie odporności betonu na pękanie. Wprowadzenie betonu wzmocnionego włóknami stalowymi i polipropylenowymi zaproponowano jako rozwiązanie do opracowania betonu o zwiększonej wytrzymałości na zginanie i rozciąganie.
Źródło:
Fibres & Textiles in Eastern Europe; 2018, 1 (127); 59-66
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal selection of dental implant for different bone conditions based on the mechanical response
Autorzy:
Roy, S.
Das, M.
Chakraborty, P.
Biswas, J. K.
Chatterjee, S.
Khutia, N.
Saha, S.
Roychowdhury, A.
Powiązania:
https://bibliotekanauki.pl/articles/307549.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
wytrzymałość kości
implanty stomatologiczne
analiza FEM
pacjent
bone condition
porous dental implant
FE Analysis
patient specific
Opis:
Bone quality varies from one patient to another extensively; also, Young’s modulus may deviate up to 40% of normal bone quality, which results into alteration of bone stiffness immensely. The prime goal of this study is to design the optimum dental implant considering the mechanical response at bone implant interfaces for a patient with specific bone quality. Method. 3D model of mandible and natural molar tooth were prepared from CT scan data while, dental implants were modelled using different diameter, length and porosity and FE analysis was carried out. Based on the variation in bone density, five different bone qualities were considered. First, failure analysis of implants, under maximum biting force of 250N had been performed; next, the implants, those survived were selected for observing the mechanical response at bone implant interfaces under common chewing load of 120N. Result. Maximum Von Mises stress did not surpass the yield strength of the implant material (TiAl4V). However, factor of safety of 1.5 was considered and all but two dental implants survived the design stress or allowable stress. Under 120N load, distribution of Von Mises stress and strain at the bone-implant interface corresponding to the rest of the implants for five bone conditions were obtained and enlisted. Conclusion. Implants, exhibiting interface strain within 1500-3000 microstrain range show the best bone remodelling and osseointegration. So, implant models, having this range of interface strains were selected corresponding to the particular bone quality. A set of optimum dental implants for each of the bone qualities were predicted.
Źródło:
Acta of Bioengineering and Biomechanics; 2017, 19, 2; 11-20
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Earth observation and geospatial techniques for soil salinity and land capability assessment over Sundarban Bay of Bengal Coast, India
Autorzy:
Das, S.
Choudhury, M. R
Nagarajan, M.
Powiązania:
https://bibliotekanauki.pl/articles/145537.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
właściwości gleby
teledetekcja
dane satelitarne
Landsat
GIS and Remote Sensing
kriging
soil properties
land capability
Opis:
To guarantee food security and job creation of small scale farmers to commercial farmers, unproductive farms in the South 24 PGS, West Bengal need land reform program to be restructured and evaluated for agricultural productivity. This study established a potential role of remote sensing and GIS for identification and mapping of salinity zone and spatial planning of agricultural land over the Basanti and Gosaba Islands(808.314sq. km) of South 24 PGS. District of West Bengal. The primary data i.e. soil pH, Electrical Conductivity (EC) and Sodium Absorption ratio (SAR) were obtained from soil samples of various GCP (Ground Control Points) locations collected at 50 mts. intervals by handheld GPS from 0–100 cm depths. The secondary information is acquired from the remotely sensed satellite data (LANDSAT ETM+) in different time scale and digital elevation model. The collected field samples were tested in the laboratory and were validated with Remote Sensing based digital indices analysisover the temporal satellite data to assess the potential changes due to over salinization. Soil physical properties such as texture, structure, depth and drainage condition is stored as attributes in a geographical soil database and linked with the soil map units. The thematic maps are integrated with climatic and terrain conditions of the area to produce land capability maps for paddy. Finally, The weighted overlay analysis was performed to assign theweights according to the importance of parameters taken into account for salineareaidentification and mapping to segregate higher, moderate, lower salinity zonesover the study area.
Źródło:
Geodesy and Cartography; 2016, 65, 2; 163-192
2080-6736
2300-2581
Pojawia się w:
Geodesy and Cartography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Highly efficient cladding pumped dual-wavelength thulium ytterbium co-doped fiber laser
Autorzy:
Latiff, A.A.
Babar, I.
Shamsudin, H.
Paul, M.
Halder, A.
Das, S.
Bhadra, S.
Ahmad, H.
Harun, S.
Powiązania:
https://bibliotekanauki.pl/articles/1058544.pdf
Data publikacji:
2016-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.55.Wd
42.60.Fc
42.70.-a
Opis:
This paper describes the all-fiber dual-wavelength thulium ytterbium co-doped fiber laser by using a newly developed octagonal shaped double-clad thulium-ytterbium co-doped fiber as gain medium in conjunction with spatial filtering effect. The thulium ytterbium co-doped fiber laser operates at wavelengths of 1990.64 nm and 1998.92 nm with a signal to noise ratio of more than 34 dB as the 980 nm multimode pump power is increased above a threshold value of 1.5 W. The slope efficiency of the dual-wavelength laser is measured to be around 26.16%, which is comparable with the conventional thulium laser pumped by 800 nm single mode pump.
Źródło:
Acta Physica Polonica A; 2016, 130, 6; 1332-1335
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uses of second order variant Fibonacci universal code in cryptography
Autorzy:
Basu, M.
Das, M.
Powiązania:
https://bibliotekanauki.pl/articles/206024.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Fibonacci numbers
Fibonacci coding
GopalaHemachandra sequence
Zeckendorf’s representation
Gopala-Hemachandra code
GH code straight line
cryptography
Opis:
We know from Zeckendorf’s theorem that every positive integer n has unique representation of the form n =Pl k=1 akF(k), where ak ∈ {0,1} and F(k) is a Fibonacci number such that the string a1a2a3 ... does not contain any consecutive 1’s. In this paper we consider second order variant Fibonacci universal code from Gopala-Hemachandra sequence. Thereby, we describe the uses of this code in cryptography with an illustrative example.
Źródło:
Control and Cybernetics; 2016, 45, 2; 239-251
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lorentz Transformation in Super System and in Super System of Photon
Autorzy:
Das, M. C.
Misra, R.
Powiązania:
https://bibliotekanauki.pl/articles/412190.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Lorentz transformation
electromagnetic field
gravitational field
photon
Opis:
Lorentz transformation considers that relative velocity of the frame of references in inertial system is less than the velocity of light. If it be such that a frame is moving with velocity same as that of light with respect to a frame of observer then, Lorentz transformation in it will not be same as done in inertial system. Again photon is not only a particle or wave but it is a complex system due to the fact that it possesses spin and linear motion simultaneously. So, it will have some complex characteristics. In this work first, trial would be made to find out the process of Lorentz transformation in between two frames having relative velocity same as that of light and then, this concept, would be applied in the system of photon.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 1; 8-14
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Classical Approach of Unified Field
Autorzy:
Das, M. CH.
Misra, R.
Powiązania:
https://bibliotekanauki.pl/articles/411543.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
electromagnetic field
gravitational field
photon
unified field
Opis:
Photons contribute electromagnetic field that accompanies the gravitational field. These two fields may be, mutually, transformed through a kind of transformation matrix dependent upon the boundary conditions of the system. In this work trial would be made to find the nature of this transformation matrix considering a super system of photon in which both fields are unified. The unification of electromagnetic and gravitational fields leads to the concept of fundamental charge.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 7, 2; 73-84
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Electrically Conductive Nanocrystalline Thin Film for Optoelectronic Applications
Autorzy:
Das, S K.
Islam, J. M. M.
Hasan, M.
Kabir, H.
Gafur, Md. A.
Hoque, E.
Khan, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/412543.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Conductive thin film
Composite
TiO2
Solar cell
Optoelectronics
Sodium alginate
Opis:
Sodium alginate (TiO2) sand composites were prepared by solution casting. Purified sand was added in the composite films to increase electrical conductivity. Electrical properties such as conductivity, capacitance, dielectric constant, and loss tangent of the composites were investigated. The current voltage characteristics for all the composites showed ohmic behavior. All the electrical properties have been found to improve with the incorporation of sand (SiO2) but 6 % sand containing composite exhibits the best electrical properties. The mechanical properties tensile strength (TS), elongation at break (Eb) and Young modulus for 6 % sand containing composite film are found to be 4.445 MPa, 9.76 %, and 72.8 MPa respectively. The experimental results reveal that the blended films exhibit higher stability and improved mechanical properties of both tensile strength and elongation at break in dry state. Water absorption properties of the composites are found to decrease with the increase of sand content. Lowest water uptake properties and highest stability were demonstrated by 6 % sand containing sample. Electrically conductive composite films have useful applications for solar cells and optoelectronics. Thus, this study is very much expected to aid in the design and selection of proper composite for the potential application of solar cell and optoelectronics.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 10, 1; 90-101
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Permittivity and Viscoelastic Measurements οf Two Tricomponent Mixtures Consisting οf Laterally Fluorinated Terphenyl Derivatives
Autorzy:
Basak, S.
Dasgupta, P.
Das, B.
Das, M.
Dabrowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1400143.pdf
Data publikacji:
2013-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.-v
78.20.Fm
87.19.rd
87.19.rf
83.60.Bc
Opis:
Two tricomponent room temperature nematic eutectic mixtures ABC and ABD with laterally fluorinated constituents A and B were prepared as base mixtures for vertically aligned mode LCD's. The physical properties of these mixtures viz. birefringence, dielectric anisotropy, bend elastic constant, relaxation time and rotational viscosities were determined in order to compare with the optimum values required to achieve the target specifications of VA mode materials. The dielectric anisotropy, Δ ε, and optical birefringence, Δ n, of these mixtures were found to be in the range of (-1.3 to -1.4) and (0.13 and 0.14), respectively, at around 20°C. The figure of merit for the ABD mixture has been found to be higher than that of ABC mixture throughout the entire temperature range. The pretilt angle effect in the physical parameters has also been studied. At T=20°C, the response time decreases to 25% and 35% for mixture ABC for 2° and 5° pretilt respectively in comparison to zero pretilt. On the other hand, at the same temperature for the ABD mixture these values are reduced by 16% and 35%, respectively.
Źródło:
Acta Physica Polonica A; 2013, 123, 4; 714-719
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Personality Correlates of Accident-Proneness in Auto-Rickshaw Drivers in India
Autorzy:
Manglam, M. K.
Sinha, V. K.
Praharaj, S. K.
Bhattacharjee, D.
Das, A.
Powiązania:
https://bibliotekanauki.pl/articles/89811.pdf
Data publikacji:
2013
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
personality
accident-proneness
drivers
16-PF
kierowcy i maszyniści
wypadki przy pracy
Indie
osobowość
kierowcy
Opis:
Objective. We examined the personality correlates of accident-proneness of auto-rickshaw drivers in the Indian city of Ranchi. Methods. This was a cross-sectional study in which 50 male drivers aged 18-50 years, selected randomly from a list of licensed auto-rickshaw drivers in Ranchi, were assessed with a Hindi version of Cattell's 16 Personality Factors (l6-PF) Questionnaire. Results. There was a significantly higher frequency of breaking rules, crossing speed limits, substance use and a trend towards a higher frequency of carrying extra persons (i.e., more than recommended) in accident-prone drivers. There was significant negative correlation of accident-proneness with 16-PF factors such as reasoning, rule consciousness, apprehension and emotional stability. Conclusion. Personality characteristics with lower scores of reasoning, rule consciousness, apprehension and emotional stability are common in commercial auto-rickshaw drivers with high accident-proneness.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2013, 19, 2; 159-165
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Space-Time Geometry of Electromagnetic Field in the System of Photon
Autorzy:
Das, M. CH.
Misra, R.
Powiązania:
https://bibliotekanauki.pl/articles/412284.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
space-time geometry
unified field
electromagnetic field
Opis:
In the concept of general relativity gravity is the space-time geometry. Again, a relation between electromagnetic field and gravitational field is expected. In this paper, space-time geometry of electromagnetic field in the system of photon has been introduced to unify electromagnetic field and gravitational field in flat and curvature space-time.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 9, 1; 13-16
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
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