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Wyszukujesz frazę "phase function" wg kryterium: Temat


Tytuł:
The variable phase approach: phase, amplitude and wave functions of the states for np- system for Argonne v18 potential
Autorzy:
Zhaba, V. I.
Powiązania:
https://bibliotekanauki.pl/articles/1070870.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
amplitude function
phase function
phase shifts
single-channel scattering
variable phase approach
wave function
Opis:
Numerical calculations of the values of phase, amplitude and wave functions for the nucleon-nucleon potential Argonne v18 are carried out using the variable phase approach. Peculiarities of the behavior of these functions are described for coordinates up to 7 fm and with energies of interaction Еlab = 1; 50; 100; 150; 250; 350 MeV. 1S0-, 1P1-, 3P0-, 3P1-, 1D2-, 3D2-, 1F3-, 3F3-, 1G4-, 3G4- states for the np- system are considered. The obtained graphic materials for the indicated functions can help to give a better and more complete quantum mechanical representation of the scattering phase and scattering amplitudes for the neuron-proton scattering, as well as better understand and supplement the data for the problem of scalar amplitude and the full cross-section of the nucleon-nucleon scattering.
Źródło:
World Scientific News; 2019, 123; 161-180
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shock models under policy N
Autorzy:
Pérez-Ocón, R.
Montoro-Cazorla, D.
Segovia, M. C.
Powiązania:
https://bibliotekanauki.pl/articles/2069713.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
phase type distribution
shock model
reliability
survival function
Opis:
We present the life distribution of a device subject to shocks governed by phase-type distributions. The probability of failures after shock follows discrete phase-type distribution. Lifetimes between shocks are affected by the number of cumulated shocks and they follow continuous phase-type distributions. The device can support a maximum of N shocks. We calculate the distribution of the lifetime of the device and illustrate the calculations by means of a numerical application. Computational aspects are introduced. This model extends other previously considered in the literature.
Źródło:
Journal of Polish Safety and Reliability Association; 2008, 2; 295--298
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical Models for Distribution of the Envelope and Phase of Linearly Modulated Signals in AWGN Channel
Autorzy:
Moazzeni, T
Jiang, Y.
Selvaraj, H.
Chen, T.
Powiązania:
https://bibliotekanauki.pl/articles/226459.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
digital modulation
linear modulation
probability density function
phase
AWGN
Opis:
In this paper, analytical expressions for the distribution of the envelope and phase of linearly modulated signals such as BPSK, M-PSK, and M-QAM in AWGN are presented. We perform numerical simulations for different orders of signal constellations. The results show that the proposed theoretical models are in excellent agreement with the estimated distributions from various numerical experiments.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 1; 79-82
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric and nonparametric diagnostic models for blades in the rotating machinery with environment elimination
Autorzy:
Grądzki, R.
Golak, K.
Lindstedt, P.
Powiązania:
https://bibliotekanauki.pl/articles/244217.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
diagnostic model
phase shift
amplitude gain
power spectral transfer function
Opis:
The article presents an analysis of the technical condition of the two blades with different technical conditions (for medium and low wear). It is shown that the evaluation of the blades basis only on the endoscopic research does not provide full information about the technical condition (known only the external condition of the blades). Proposed supplement endoscopic examinations of is the use of two parametric methods (the blades are tested during operation of rotating machine) based on the auto and cross power spectral density functions for the signal measured as displacement of the rotor blade tip y(t). As result of these methods is the portrait of the blades was obtained (in the form of clear colour images providing a degree of a wear), which also includes the internal condition of the blades. The additional complement to parametric methods may be nonparametric method. Auto and cross power spectral density functions (obtained from measurement of the blade tip movement) is a basis to determine the characteristics (abstract step and impulse responses) of each blade. Both parametric methods which nonparametric method clearly confirmed that the technical condition of first considered blade (no. 2) differs from the technical condition of the second blade (no. 22).
Źródło:
Journal of KONES; 2016, 23, 2; 137-145
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the external proximity effect on the power losses in flat three phase high current busduct
Autorzy:
Piątek, Z.
Szczegielniak, T.
Kusiak, D.
Powiązania:
https://bibliotekanauki.pl/articles/97507.pdf
Data publikacji:
2011
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
active power
reactive power
Bessel function
three phase current busduct
Opis:
In the paper the influence of the external proximity effect on the active and reactive power in flat three phase high current busduct were presented. Calculations were made using the Poynting theorem and Joule-Lenz law.
Źródło:
Computer Applications in Electrical Engineering; 2011, 9; 34-44
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Retrospective analysis of the effectiveness of treatment of the pituitary micro adenomas in nulliparous women, taking into account the fractionation of prolactin and correction of the luteal phase deficiency
Autorzy:
Trushkevich, A. A.
Stepura, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/1032199.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Kazimierza Wielkiego w Bydgoszczy
Tematy:
micro adenoma
luteal phase deficiency
reproductive function
микроаденома
недостаточность лютеиновой фазы
репродуктивная функция.
Opis:
Prolactin synthesizing pituitary body (PB) tumors are in the third flight among nervous systems neoplasms and constitute up to 17% of brain tumours. Prolactinoma is the most frequently met endocrine active tumour of PB, and it accounts for 30% of all adenomas. Manifesting sign of PB adenoma is the increase of prolactin level. The retrospective analysis of conservative treatment efficacy of micro adenomas in nulliparous women of the early reproductive age had been done. Molecular polymorthism of prolactin and correction of luteal phase deficiency was taken into account. Objective. To determine qualitative and quantitative context of lutein and, first of all, the level of its “little” fraction in the patients with micro adenomas of PB, determine the relation between clinical signs and data of hormonal examination, substantiate differentiated approach to the treatment of organic pathology of PB. Materials and Methods: 40 nulliparous women with micro adenoma of PB, aged 18 – 26 y.o. General clinical, gynecological, hormonal, ultra sound examinations and CT of brain have been. A prolonged therapy with microdoses of dostinex under the contol of prolactin fractions has been offered. Clinical effect was gained at 40% of cases and in 4 patients there was a complete recovery. The positive dynamics in the state of vision analyzer has been noted, as well as improvement of hormonal state, rehabilitation of reproductive function. High acceptability of the treatment has been registered.
Ретроспективный анализ эффективности лечения микроаденом гипофиза у нерожавших женщин с учетом фракционирования пролактина и коррекцией недостаточности лютеиновой фазы. А. А. Трушкевич, А. А. Степур (Крымский государственный медицинский университет им. С. И. Георгиевского, Симферополь). Пролактинсинтезирующие опухоли гипофиза занимают третье место среди новообразований нервной системы и до 17% опухолей головного мозга. Пролактинома -наиболее часто встречающаяся эндокринно активная опухоль гипофиза, на долю которой приходится до 30% всех аденом. Манифестирующим признаком аденом гипофиза является повышение уровня пролактина. Был проведен ретроспективный анализ эффективности консервативного лечения микроаденом гипофиза у нерожавших женщин раннего репродуктивного возраста с учетом молекулярного полиморфизма пролактина и коррекцией недостаточности лютеиновой фазы. Цель – определить качественный и количественный состав пролактина, прежде всего уровень фракции «little» у пациенток с микроаденомами гипофиза, установить взаимосвязь клинический проявлений и данных гормонального обследования, обосновать дифференцированный подход к лечению органической патологии гипофиза. Материалы и методы: 40 нерожавших женщин с микроаденомой гипофиза в возрасте 18-26 лет. Проведено общеклиническое, гинекологическое, гормональное, УЗисследование, КТ головного мозга. Предложена длительная терапия микродозами препарата достинекс под контролем фракции пролактина. Клинический эффект получен в 40% случаев, у 4 пациенток микроаденома излечена полностью. Отмечена положительная динамика в состоянии зрительного анализатора, улучшение гормонального статуса больных, реабилитация репродуктивной функции, хорошая переносимость терапии пациентками.
Źródło:
Journal of Health Sciences; 2014, 4, 7; 18-26
1429-9623
Pojawia się w:
Journal of Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Memory response on generalized thermoelastic medium in context of dual phase lag thermoelasticity with non-local effect
Autorzy:
Tiwari, R.
Saeed, A. M.
Kumar, R.
Kumar, A.
Singhal, A.
Powiązania:
https://bibliotekanauki.pl/articles/38694222.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
memory dependent derivative
time-delay
kernel function
non-local
continuum theory
dual phase lags
Opis:
Theory of non-local continuum is contemporary appraised and is found to be supplementary coherent to capture the impacts of each and every point of the material at its single point. The conviction of memory dependent derivative is also newly appraised and is observed to be more intuitionistic for predicting the realistic character of the real-world obstacles. Attractiveness of the belief of a memory dependent derivative lies in its unique properties such as its significant constituents – a kernel function and time-delay are freely selected according to the requirement of a problem. The present study comprises a new meticulous thermoelastic heat conduction model for the homogeneous, isotropic, thermoelastic half space medium concerning memory effects and non-local effects. Governing equations are constructed on the basis of the newly appraised non-local generalized theory of thermoelasticity with two phase lags in the frame of a memory dependent derivative. Exact analytical solutions of the physical fields such as dimensionless temperature, displacement as well as thermal stress are evaluated by using a suitable technique of the Laplace transform. Quantitative results are determined in a time-domain for different values of time by taking the numerical inversion of the Laplace transform. Noteworthy role of the constituents of the memory dependent derivative such as kernel function as well as time-delay factor has been scrutinized on the crucial field variables of the medium through computational outcomes. Moreover, the impact of non-local parameter is examined on the variations of field quantities through the quantitative results.
Źródło:
Archives of Mechanics; 2022, 74, 2-3; 69-88
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability modeling for dependent competing failure processes with phase-type distribution considering changing degradation rate
Autorzy:
Lyu, Hao
Wang, Shuai
Zhang, Xiaowen
Yang, Zaiyou
Pecht, Michael
Powiązania:
https://bibliotekanauki.pl/articles/2038056.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
dependent competing failure processes
phase type distribution
changing degradation rate
reliability modeling
survival function
Opis:
In this paper, a system reliability model subject to Dependent Competing Failure Processes (DCFP) with phase-type (PH) distribution considering changing degradation rate is proposed. When the sum of continuous degradation and sudden degradation exceeds the soft failure threshold, soft failure occurs. The interarrival time between two successive shocks and total number of shocks before hard failure occurring follow the continuous PH distribution and discrete PH distribution, respectively. The hard failure reliability is calculated using the PH distribution survival function. Due to the shock on soft failure process, the degradation rate of soft failure will increase. When the number of shocks reaches a specific value, degradation rate changes. The hard failure is calculated by the extreme shock model, cumulative shock model, and run shock model, respectively. The closed-form reliability function is derived combining with the hard and soft failure reliability model. Finally, a Micro-Electro-Mechanical System (MEMS) demonstrates the effectiveness of the proposed model.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 4; 627-635
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of a single server queue in a multi-phase random environment with working vacations and customers’ impatience
Autorzy:
Bouchentouf, Amina Angelika
Guendouzi, Abdelhak
Houalef, Meriem
Majid, Shakir
Powiązania:
https://bibliotekanauki.pl/articles/2175837.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
queueing model
multi-phase random environment
working vacation policies
impatient customer
probability generating function
Opis:
In this paper, we analyze an M/M/1 queueing system under both single and multiple working vacation policies, multiphase random environment, waiting server, balking and reneging. When the system is in operative phase j = 1, 2, . . . , K, customers are served one by one. Whenever the system becomes empty, the server waits a random amount of time before taking a vacation, causing the system to move to working vacation phase 0 at which new arrivals are served at a lower rate. Using the probability generating function method, we obtain the distribution for the steady-state probabilities of the system. Then, we derive important performance measures of the queueing system. Finally, some numerical examples are illustrated to show the impact of system parameters on performance measures of the queueing system.
Źródło:
Operations Research and Decisions; 2022, 32, 2; 16--33
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Introduction of three-dimensional measurement technologies developed and applied in suzuki motor corporation
Autorzy:
Yamage, Y.
Aoki, T.
Hashimoto, T.
Rövid, A.
Shibahara, T.
Akatsuka, S.
Suzuki, H.
Takeshi, M.
Ono, M.
Powiązania:
https://bibliotekanauki.pl/articles/385092.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
image measurement
3D measurement
Direct
Linear Transformation (DLT) methods
Phase-Only Correlation
(POC) function
Opis:
Suzuki Motor Corporation (SMC) recognizes the importance of collaborative projects with Universities and how it contributes to technological development effectively. In spite of the world economical depression, several projects could get started this year leaded by SMC. As a researcher of SMC, Author takes charge of two collaborative projects and introduces these as typical examples of the most successful collaborations. The first is, "3D Measurement System for Crash Tested Car" at Shizuoka University (Japan) and Budapest Tech Polytechnical Institute (Hungary) from 2008; the second is, "High-Accuracy Stereo Vision System Based on Phase-Only Correlation (POC) and Its Application to metal Component Inspection" with Tohoku Univ. (Japan) 2003-2005. By these collaborations, the profound knowledge of universities has a lot of possibility to suits the technical needs of SMC.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 220-223
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isotope effects on vapor phase 2nd virial coefficients
Autorzy:
Van Hook, W.
Rebelo, L.
Wolfsberg, M.
Powiązania:
https://bibliotekanauki.pl/articles/146957.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
isotope effects
Lennard-Jones potential
reduced partition function ratio
vapor phase
vapor pressure isotopic difference
virial coefficients
Opis:
Vapor phase 2nd virial coefficient isotope effects (VCIE's) are interpreted. A useful correlation is developed between -Delta(Beta-bo)/(Beta-bo) = (-VCIE) and the reference condensed phase reduced isotopic partition function ratio [ln(fc/fg)]*. B is the second virial coefficient, bo = 2pi sigma3/3, sigma is the Lennard-Jones size parameter, and Delta is an isotopic difference, light-heavy. [ln(fc/fg)]* can be obtained from vapor pressure isotope effects for T/TCRITICAL < 0.7. Also (-VCIE) = ln(fp/fg 2), where ln(fp/fg 2) is the reduced isotopic partition function ratio describing the equilibrium between monomers and interacting pairs. At temperatures well removed from crossovers in ln(fp/fg 2) or [ln(fc/fg)]*, ln(fp/fg 2) = (0.4š0.2) [ln(fc/fg)]*.
Źródło:
Nukleonika; 2002, 47,suppl.1; 47-51
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary investigation to estimate soil NAPL retention using parametric pedotransfer functions
Autorzy:
Hernadi, H.
Mako, A.
Powiązania:
https://bibliotekanauki.pl/articles/24805.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
pressure-saturation relationship
soil property
soil
non-aqueous phase liquid
retention
pedotransfer function
hydraulic characteristics
van Genuchten method
Opis:
Organic liquid retention of soils is a primary input variable for modelling the nonaqueous phase liquid transport and behaviour in the subsurface. In environmental and soil physical practice, it is mainly determined by scaling based on the water retention of soils or with charts of average empirical values of organic liquid retention or the fitting parameters of hydraulic functions. Predicting the fitting parameters of organic liquid retention curves with pedotransfer functions might be a promising alternative method, but this topic has only been researched to a limited extent. Thus we investigated the applicability of different hydraulic functions (3- and 4- parameter form of the van Genuchten equation and Brutsaert equation) for fitting organic liquid retention characteristics. Multivariate linear regression was used to build and develop pedotransfer functions, modelling relations between original and transformed values of basic soil properties and organic liquid retention. We attempted to generate parametric pedotransfer functions. According to our results, the applicability of hydraulic functions for fitting nonaqueous phase liquid retention curves to the experimental data was proven. The investigations gave promising results for the possibility to estimate soil nonaqueous phase liquid retention with parametric pedotransfer functions.
Źródło:
International Agrophysics; 2014, 28, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical modeling of random concentracion field and its second moments in semispace with Erlangian distributions of layerd inclusions
Autorzy:
Chernukha, O.
Bilushchak, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1938608.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska
Tematy:
diffusion process
randomly inhomogeneous stratified structure
Erlangian distribution
field dispersion
correlation function
Neumann series
averaging over the ensemble of phase configurations
Opis:
The processes of admixture diffusion in a two-phase stratified semispace with random disposition of syblayers are studied by the approach where internal random nonhomogeneities are considered as inner sources and the solution is found in the form of a Neumann series. The diffusion equations are formulated for one-connected regions of each phase and non-ideal contact conditions for the concentration on interphases are imposed. By the theory of generalized functions the contact problem is reduced to the equation of mass transfer in the whole body, which operator includes explicitly jump discontinuities of the concentration function and its derivatives. The obtained initial-boundary value problem of mass transfer is reduced to the equivalent integro-differentual equation. The solution is constructed in the form of a Neumann series and averaged over the ensemble of phase configurations with Erlangian and exponential distributions of inclusions. Dispersion and the two-point correlation function of the concentration field for diffusion are determined taking into account the probable distribution of inclusions, pair interaction of sublayers and the function of phase correlation. The dependence of the behavior of the averaged admixture concentration, field dispersion and the correlation function in the semispace with Erlangian and exponential distributions of inclusions on different medium characteristics is investigated and established.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 3; 295-334
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Self-twist Distribution Functions in Different Convergence Modes
Badanie funkcji rozkładu skrętu przędzy przy różnych konfiguracjach łączenia
Autorzy:
Cui, H.
Yu, C.
Powiązania:
https://bibliotekanauki.pl/articles/232550.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
pasmo
self-twist
tryb konwergencji
funkcja rozkładu skrętu
w fazie
stopniowo
przędza samoskrętna
strand
convergence mode
twist distribution function
in-phase
phased
Opis:
Twist distribution functions of self-twist yarn are examined by calculating the twist distribution functions of two strands from the nip of self-twist rollers to the convergence point in three different convergence modes. Twist distribution curves of three different convergence modes on the half cycle length are presented by the twist distribution functions. The images show that the self-twist yarn with a phase difference has a lower self-twist peak than inphase self-twist yarn. Thus the existence of a phase difference not only causes a decrease in the self-twist but also a decrease in the length of the weak-twist zone. Furthermore, the value of the phase difference is calculated according to the twist functions of two strands. Compared with the conventional result, that by the method in this paper is closer to the actual length of the zero twist zone.
Funkcje rozkładu skrętu dla przędzy samoskrętnej badano w zależności od punktu łączenia. Funkcje rozkładu zostały przedstawione dla trzech różnych wariantów łączenia. W badaniach analizowano zarówno powstanie przesunięć fazowych jak i okresowych wzrostów wartości skrętu. Na podstawie funkcji rozkładu skrętu dwóch strumieni przędzy można określić przesuniecie fazowe. Stwierdzono, że stosowanie metody identyfikacji opisanej w artykule daje lepsze efekty niż stosowanie metod konwencjonalnych.
Źródło:
Fibres & Textiles in Eastern Europe; 2012, 5 (94); 26-29
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical solution of the dual phase lag equation describing the laser heating of thin metal film
Autorzy:
Ciesielski, M.
Powiązania:
https://bibliotekanauki.pl/articles/122626.pdf
Data publikacji:
2017
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
dual phase lag equation
laser heating process
analytical solution
Green's function method
transfer ciepła
laserowy proces ogrzewania
równanie z dwoma czasami opóźnień
metoda funkcji Greena
Opis:
Heat transfer processes occurring in the micro-domains can be described using the dual-phase lag equation (DPLE). This equation can be applied as a model of heating of the thin metal film subjected to the femtosecond laser pulse. In the paper, the 1D dual phase lag equation containing the additional internal heat source resulting from the laser pulse irradiation and supplemented by the appropriate boundary and initial conditions is considered. Appearing in this equation two lag times τq the phase lag of the heat flux) and τT (the phase lag of the temperature gradient) are taken into account. An analytical solution of this equation under the assumption that τT > τq is presented. The separation of the variables technique and the Green’s function method are used in order to find this solution. In the final part of the paper, the example of computations is presented.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2017, 16, 1; 33-40
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł

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