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Wyświetlanie 1-15 z 58
Tytuł:
A random number generator using ring oscillators and the Keccak as post-processing
Autorzy:
Łoza, S.
Matuszewski, Ł.
Jessa, M.
Kubczak, P.
Powiązania:
https://bibliotekanauki.pl/articles/114620.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
true random number generator
ring oscillator
cryptography
field programmable gate array (FPGA)
hash function
Opis:
In cryptography, sequences of numbers with unpredictable elements are often required. Such sequences should pass all known statistical tests for random sequences. Because sequences produced in real circuits are biased, they do not pass many statistical tests, e.g., the distribution of numbers is not uniform. Such random number sequences should be subjected to a transformation called post-processing. In this paper, a true random number generator is considered. It uses ring oscillators and the Keccak hash function as post-processing. This paper presents only simulation conditions for this approach since the post-processing part was done using x86 architecture on a PC.
Źródło:
Measurement Automation Monitoring; 2015, 61, 7; 290-292
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of variation of geomagnetic field parameters upon applying the theory of covariance functions
Autorzy:
Skeivalas, Jonas
Obuchovski, Romuald
Powiązania:
https://bibliotekanauki.pl/articles/221411.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
geomagnetic field parameters
covariance function
quantization interval
Opis:
In the paper, the variation of the intensity of the geomagnetic field force is analysed in time and space. For the research, the data from measurements of the intensity of the geomagnetic field force at four airports (Kaunas, Klaipéda, Palanga and Vilnius) and 6 geomagnetic field repeat stations as well as the data from Belsk Magnetometric Observatory (Poland) were used. For the data analysis, the theory of covariance functions was applied. The estimates of the cross-covariance functions of the measured intensity of the geomagnetic field force or the estimates of auto-covariance functions of single data were calculated according to the random functions created from the force intensity measurement data arrays. The estimates of covariance functions were calculated upon varying the quantization interval on the time scale and applying the software created using Matlab package of procedures. The impact of radars of airports on the intensity of geomagnetic field variation and on changes of their covariance functions was established.
Źródło:
Metrology and Measurement Systems; 2019, 26, 2; 363-376
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of occupational health problems and physiological stress among the brick field workers of West Bengal, India
Autorzy:
Das, Banibrata
Powiązania:
https://bibliotekanauki.pl/articles/2178850.pdf
Data publikacji:
2014-06-21
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
brick field workers
physiological stress
occupational health problems
thermal stress
lung function values
hand-grip strength
Opis:
Objectives: The brick field industry is one of the oldest industries in India, which employs a large number of workers of poor socioeconomic status. The main aim of the present investigation is i) to determine the prevalence of musculoskeletal disorders among brick field workers, ii) to determine the prevalence of respiratory disorders and physiological stress among brick field workers compared to control workers. Material and Methods: For this study, a total of 220 brick field workers and 130 control subjects were selected randomly. The control subjects were mainly involved in hand-intensive jobs. The Modified Nordic Questionnaire was applied to assess the discomfort felt among both groups of workers. Thermal stress was also assessed by measuring the WBGT index. The pulmonary functions were checked using the spirometry. Physiological assessment of the workload was carried out by recording the heart rate and blood pressure of the workers prior to work and just after work in the field. Results: Brick field workers suffered from pain especially in the lower back (98%), hands (93%), knees (86%), wrists (85%), shoulders (76%) and neck (65%). Among the brick-making activities, brick field workers felt discomfort during spading for mud collection (98%), carrying bricks (95%) and molding (87%). The results showed a significantly lower p value < 0.001 in FVC, FEV₁, FEV₁/FVC ratio and PEFR in brick field workers compared to the control group. The post-activity heart rate of the brick field workers was 148.6 beats/min, whereas the systolic and diastolic blood pressure results were 152.8 and 78.5 mm/Hg, respectively. Conclusions: This study concludes that health of the brick field workers was highly affected due to working in unhealthy working conditions for a long period of time.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2014, 27, 3; 413-425
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charged anisotropic models in a modified Tolman IV spacetime
Autorzy:
Malaver, Manuel
Powiązania:
https://bibliotekanauki.pl/articles/1177697.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Adjustable parameter
Compact relativistic objects
Electromagnetic field
Gravitational potential
Metric function
Tolman IV type potential
Opis:
In this paper, we study the behaviour of compact relativistic objects with charged anisotropic matter distribution considering modified Tolman IV type potential for the gravitational potential Z(x) which depends on an adjustable parameter α and a particular form of the metric function y(x) used by Malaver (2009). The Einstein-Maxwell fields equations are integrated analytical and we obtain the radial pressure, energy density, charge density, anisotropy and the mass function. A physical analysis of electromagnetic field indicates that is regular at the origin and well behaved. The new stellar models satisfies all physical properties in a realistic star for any value of the adjustable parameter.
Źródło:
World Scientific News; 2018, 101; 31-43
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charged stellar model with a prescribed form of metric function y(x) in a Tolman VII spacetime
Autorzy:
Malaver, Manuel
Powiązania:
https://bibliotekanauki.pl/articles/1163837.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Compact relativistic objects
Electromagnetic field
Gravitational potential
Metric function
Tolman VII type potential
Opis:
In this paper, we study the behaviour of compact relativistic objects with charged anisotropic matter distribution considering Tolman VII type potential for the gravitational potential Z(x) and a particular form of the metric function y(x) proposed for Komathiraj and Maharaj (2007). The Einstein-Maxwell field equations are integrated analytical and we obtain the radial pressure, energy density, charge density, anisotropy and the mass function. A physical analysis of electromagnetic field indicates that is regular at the origin and well behaved. The new stellar model satisfies all physical properties in a realistic star.
Źródło:
World Scientific News; 2018, 108; 41-52
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of heating curves of a rectangular busbar in different conditions of heat abstraction during the short-circuit heating
Autorzy:
Zaręba, M.
Powiązania:
https://bibliotekanauki.pl/articles/201224.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analytical methods
field theory
transient heat flow
short-circuit in leads
Green’s function
metody analityczne
teoria pola
nieustalony przepływ ciepła
funkcja Greena
Opis:
The paper compares heating curves for a rectangular busbar in the conditions of convective and adiabatic heat transfer during short-circuit heating. Different coefficients of heat transfer from the external surface of the busbar and different busbar cross-sections have been assumed. This has allowed determining the error value occurring when the adiabatic rather than convective boundary condition is presumed at short circuit. The analysis takes into account a change of resistivity in the temperature function. The respective boundary-initial problems have been solved with analytical methods using Green’s function. The calculated results show that no considerable errors occur for long-lasting short circuits with an adiabatic rather than convective boundary condition.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 79-85
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correction of Evanescent Wave Influence on the Flexural Wave Velocity and Wavelength Estimation Based on a Mode Shape Function
Autorzy:
Pantelić, Filip
Šumarac Pavlović, Dragana
Mijić, Miomir
Ridley-Ellis, Daniel
Powiązania:
https://bibliotekanauki.pl/articles/31339954.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
mode shape function
flexural wave velocity
very near field
Opis:
The aim of this research is to use a simple acoustic method of a very near field recording, which enables measurement and display of oscillation modes, to estimate the velocity of flexural waves, based on the wavelengths of standing waves measured on the sample. The paper analyses cases of 1D geometry, flexural waves that occur on a beam excited by an impulse. Measurements were conducted on two different samples: steel and a wooden beam of the same length. Due to the appearance of evanescent waves at the boundary regions, the distance between the nodes of standing waves that occur deviates from half the wavelength, which can be compensated using a correction factor. Cases of fixed and free boundary conditions were analysed. By quantifying how much the boundary conditions change the mode shape function, it can be predicted how the mode of oscillation changes if the boundary conditions change, which can also find application in musical acoustics and sound radiation analysis.
Źródło:
Archives of Acoustics; 2022, 47, 4; 539-546
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Description of the hydrodynamic pressure field function around the ship hull
Autorzy:
Bielański, J.
Powiązania:
https://bibliotekanauki.pl/articles/331694.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The article presents the results of approximation calculations of the vacuum field hydrodynamic around the ship, calculated by finite element method. The control points in the middle panels distributed on the hull of the ship, on the surface of the seabed and the free surface singularities are placed in the form of spatial resources and discounts, or dipoles. Presented results of the calculations have been obtained using this first singularity. Then, using the observed field properties proposed approximation of hydrodynamic pressure distribution functions: polynomial of the ninth grade after the ship's length and the width of the exponential function, which can significantly reduce the amount of numbers needed to describe the field. For a given depth to about 20, and the entire field space can be described in a matrix of approximately 200 numbers.
Źródło:
Hydroacoustics; 2011, 14; 17-22
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of an embedded FPGA-based data acquisition system dedicated to zero power reactor noise experiments
Autorzy:
Arkani, M.
Khalafi, H.
Vosoughi, N.
Powiązania:
https://bibliotekanauki.pl/articles/220709.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zero power reactor (ZPR) noise
time interval measurement
probability distribution function (PDF)
field programmable gate array (FPGA)
data acquisition system (DAS)
nuclear reactor
neutron detection
Opis:
An embedded time interval data acquisition system (DAS) is developed for zero power reactor (ZPR) noise experiments. The system is capable of measuring the correlation or probability distribution of a random process. The design is totally implemented on a single Field Programmable Gate Array (FPGA). The architecture is tested on different FPGA platforms with different speed grades and hardware resources. Generic experimental values for time resolution and inter-event dead time of the system are 2.22 ns and 6.67 ns respectively. The DAS can record around 48-bit x 790 kS/s utilizing its built-in fast memory. The system can measure very long time intervals due to its 48-bit timing structure design. As the architecture can work on a typical FPGA, this is a low cost experimental tool and needs little time to be established. In addition, revisions are easily possible through its reprogramming capability. The performance of the system is checked and verified experimentally.
Źródło:
Metrology and Measurement Systems; 2014, 21, 3; 433-446
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of exposure to electromagnetic field radiation (EMFR) generated by activated mobile phones on fasting blood glucose
Autorzy:
Meo, Sultan A.
Al Rubeaan, Khalid
Powiązania:
https://bibliotekanauki.pl/articles/2179776.pdf
Data publikacji:
2013-04-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
mobile phone radiation
hyperglycemia
insulin resistance
β-cell function
Opis:
Objective: Extensive use of mobile phones has been accompanied by a common public debate about possible adverse effects on human health. No study has been published so far to establish any association between the fastest growing innovation of mobile phone and fasting blood glucose. The aim was to determine the effects of exposure to electromagnetic field radiation generated by mobile phones on fasting blood glucose in Wistar Albino rats. Materials and Methods: 40 Male Albino rats (Wistar Strain) were divided into 5 equally numerous groups. Group A served as the control one, group B received mobile phone radiation for less than 15 min/day, group C: 15-30 min/day, group D: 31-45 min/day, and group E: 46-60 min/day for a total period of 3 months. Fasting blood glucose was determined by using Spectrophotometer and serum insulin by Enzyme-linked Immunosorbent Assay (ELISA). The Homeostatic Model (HOMA-B) was applied for the assessment of β-cell function and (HOMA-IR) for resistance to insulin. Results: Wister Albino rats exposed to mobile phone radiation for longer than 15 min a day for a total period of 3 months had significantly higher fasting blood glucose (p < 0.015) and serum insulin (p < 0.01) compared to the control group. HOMA-IR for insulin resistance was significantly increased (p < 0.003) in the groups that were exposed for 15-30 and 46-60 min/day compared to the control rats. Conclusion: The results of the present study show an association between long-term exposure to activated mobile phones and increase in fasting blood glucose and serum insulin in Albino rats.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2013, 26, 2; 235-241
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EM emission of ICs implementated in FPGA : influence of floor plan and electric function
Autorzy:
Szczęsny, J.
Kołodziejski, J. F.
Powiązania:
https://bibliotekanauki.pl/articles/378429.pdf
Data publikacji:
2007
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Elektronowej
Tematy:
FPGA
emisja elektromagnetyczna
prąd wysokiej częstotliwości
Xilinx
electromagnetic emission
high frequency current
near-field disturbances
Opis:
In the paper some investigations are presented aiming to check the influence of IC floor plan and the circuit function on its electromagnetic emissions. As the test vehicle Xilinx FPGA XCV800 type was used, in which two types of multiplicators were implemented. To compare the effects, high frequency currents in supply and ground pins of the circuits as well as near field disturbances were measured over the circuits.
Źródło:
Electron Technology : Internet Journal; 2007, 39, 4; 1-7
1897-2381
Pojawia się w:
Electron Technology : Internet Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emisja gazów cieplarnianych a efektywność funkcjonowania polskich gospodarstw specjalizujących się w produkcji roślinnej
Emission of greenhouse gases and effectiveness of function Polish farm with field crops
Autorzy:
Zielinski, M.
Powiązania:
https://bibliotekanauki.pl/articles/572040.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Opis:
Celem badań była ocena dwóch grup gospodarstw specjalizujących się w produkcji roślinnej w zależności od salda emisji gazów cieplarnianych z gleby. Pierwszą grupę gospodarstw stanowiły gospodarstwa z ujemnym saldem emisji gazów cieplarnianych z gleby, natomiast drugą grupę gospodarstwa z saldem dodatnim. Następnie analizie porównawczej poddano ich potencjał produkcyjny, strukturę produkcji, efektywność ekonomiczną oraz nasilenie inwestycyjne. Do realizacji tak rozumianego celu wykorzystano dane empiryczne z gospodarstw specjalizujących się w produkcji roślinnej, które prowadziły nieprzerwanie rachunkowość rolną dla potrzeb Polskiego FADN w latach 2005-2010. Stwierdzono, że gospodarstwa z ujemnym saldem emisji gazów cieplarnianych z gleby w porównaniu z gospodarstwami z saldem dodatnim były w lepszej sytuacji ekonomicznej i charakteryzowały się większym nasileniem inwestycyjnym.
The aim of analysis was attempt assessment two groups farms with field crops depending on balance of emission warming gases from soil. First group contained farms with negative balance of emission warming gases from soil while second group of farms contained farms with positive balance of emission warming gases from soil. Comparative analysis concerned their production potential and structure, economic effectiveness and intensification of investment. In this purpose used empirical data from farms with field crops which collect accountancy data for Polish FADN. It has been found that farms with negative balance of emission warming gases achieve better economic situation and larger intensification of investment than other farms.
Źródło:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2014, 14[29], 3
2081-6960
Pojawia się w:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ensuring identification accuracy of navigational accelerometer\s conversion function parameters in the gravity field of the earth
Zapewnienie dokładności wyznaczania parametrów funkcji przekształcenia akcelerometru nawigacyjnego w polu grawitacyjnym ziemi
Autorzy:
Chernyak, M. G.
Baranovska, I. M.
Terokhin, S.
Powiązania:
https://bibliotekanauki.pl/articles/213076.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
navigation accelerometer
calibration
identification
metrology model
instrumental errors
specified accuracy
akcelerometr nawigacyjny
kalibrowanie
identyfikacja
metrologiczny model
błędy instrumentalne
zadana dokładność
Opis:
The problems of determining instrumental errors of navigation accelerometer metrological model's coefficients determination by its calibration on an uniaxial swivel stand and ensuring the specified accuracy of the calibration were considered. Analytical expressions for calculating appropriate identification errors and conditions for the calibration equipment the implementation of which provides the desired accuracy of the accelerometer calibration were gained. Adequacy of those expressions and conditions by calibrating a navigation accelerometer of a real inertial navigation system was experimentally confirmed. Adequacy of those expressions and conditions by calibrating a navigation accelerometer of a real inertial navigation system was confirmed experimentally.
Praca skupia się na wyznaczeniu błędów instrumentalnych wyznaczania współczynników nieliniowego modelu pomiarowego akcelerometru nawigacyjnego podczas kalibracji na jednoosiowym stoisku obrotowym, ponadto zapewnieniu zadanej dokładności powyższej kalibracji. Otrzymano wzory analityczne do wyznaczenia odpowiednich odchyłek identyfikacji oraz wymagania dla stoiska pomiarowego, spełnienie których pozwoli na utrzymanie zadanej dokładności kalibracji akcelerometru. W drodze doświadczeń potwierdzono prawidłowość wyżej opisanych wzorów i wymagań, poprzez wykonanie kalibracji nawigacyjnego akcelerometru rzeczywistego inercyjnego systemu nawigacyjnego.
Źródło:
Prace Instytutu Lotnictwa; 2016, 4 (245); 16-25
0509-6669
2300-5408
Pojawia się w:
Prace Instytutu Lotnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Erratum. Possible Long Time Tails in Current-Current Correlation Function for Two-Dimensional Electron Gas in Random Magnetic Field (Acta Phys. Pol. A 92, 1109 (1997))
Autorzy:
Łusakowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1968868.pdf
Data publikacji:
1998-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Źródło:
Acta Physica Polonica A; 1998, 93, 3; 563
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 58

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