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Wyszukujesz frazę "Mahdavi, M." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    A new method for computing the reliability of composite systems
    Autorzy:
    Karbasian, M.
    Mahdavi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2069599.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
    Tematy:
    reliability
    extreme value
    parallel structures
    series model
    life distribution
    Opis:
    This paper tries to represent a new method for computing the reliability of a system, which is arranged in series or parallel model. In this method we estimate life distribution function of whole system using the asymptotic Extreme Value (EV) distribution of Type I, or Gumbel theory. We use EV distribution in minimal mode, for estimate the life distribution function of series system and maximal mode for parallel system. All parameters also are estimated by Moments method. Reliability function and failure (hazard) rate and p-th percentile point of each function are determined. Other important indexes such as Mean Time to Failure (MTTF), Mean Time to repair (MTTR), for non-repairable and renewal systems in both of series and parallel structures will be computed.
    Źródło:
    Journal of Polish Safety and Reliability Association; 2007, 1; 199--203
    2084-5316
    Pojawia się w:
    Journal of Polish Safety and Reliability Association
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Upper bound analysis of bimetallic rod extrusion process through rotating conical dies
    Autorzy:
    Haghighat, H.
    Mahdavi, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/279191.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    bimetallic rod
    extrusion
    rotating die
    upper bound method
    FEM
    Opis:
    In this paper, an upper bound approach is used to analyze the bimetallic rod extrusion process through rotating conical dies. By extending the kinematically admissible velocity field for mono-metal rod extrusion to the bimetallic rod extrusion process, the internal power and the power dissipated on frictional and velocity discontinuity surfaces are evaluated. Then, by equating the total power with the external power produced by axial movement of the punch and the power induced by rotation of the die, the relative extrusion pressure is determined. The extrusion process of bimetallic rods composed of a copper sleeve layer and an aluminium core layer through a conical rotating die is also simulated by using the finite element code ABAQUS. The analytical results are compared with the results given by the finite element method. These comparisons show a good agreement.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 627-637
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of Pseudomonas strains and arbuscular mycorrhiza fungi as organic phosphate-solubilizing in the yield and quality improvement of strawberry (Fragaria × ananassa Duch., cv. Selva) fruit
    Autorzy:
    Ansari, M.H.
    Hashemabadi, D.
    Mahdavi, M.
    Kaviani, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/11861422.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    plant
    strawberry
    fruit
    yield
    phenolic compound content
    antioxidant content
    flavonol
    Fragaria ananassa
    Pseudomonas
    arbuscular mycorrhizal fungi
    rhizosphere microorganism
    cultivation experiment
    Opis:
    This study evaluated the effect of Pseudomonas strains and arbuscular mycorrhiza fungi (AMF) in enhancing strawberry yield and phenolic and antioxidant capacity on a phosphorus (P) deficient calcareous soil. The experiments were conducted in three replicates with six treatments (four Pseudomonas strains, AMF and control) and three rates of P-fertilizer (0, 75, 150 kg P ha–1). Application of higher phosphate rates decreased total antioxidant capacity, total phenolic and flavonols content, whereas AMF and Pseudomonas strains increased quality and P concentration of fruit. The use of AMF and Pseudomonas strains resulted in better quality when used along with 75 kg P ha–1. These results demonstrated that the rhizospheric microorganisms improved the quality of fruit, especially when they applied in combination with lower rates of chemical fertilizers. Therefore, application of these microorganisms in sustainable agriculture is recommended.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2018, 17, 4; 93-107
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Species diversity and new host records of Tetranychidae and Tenuipalpidae (Acari: Tetranychoidae) on medicinal plant Artemisia spp. (Asteraceae) in southeast of Iran
    Różnorodność gatunkowa roztoczy z rodzin Tetranychidae i Tenuipalpidae (Acari: Tetranychoidae) występujących na leczniczych roślinach Artemisia spp. (Asteraceae) w południowo-wschodnim Iranie, z podaniem nowych gatunków żywiecielskich
    Autorzy:
    Mahdavi, S.M.
    Asadi, M.
    Farzan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/841775.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    species diversity
    new host
    new record
    Tetranychidae
    Tenuipalpidae
    Acari
    medicinal plant
    Artemisia
    Compositae
    Iran
    Opis:
    During 2009–2011, in a faunistic survey of kerman province (Southeast of Iran), the mite fauna of Artemisia (Asteraceae) was investigated. Six species belonging to superfamily tetranychoidea were collected and identified. Artemisia aucheri (Asteraceae) is reported as a new host record for four species Bryobia chrysocomae Meyer, 1974; Strunkobia pamirica Livshitz & Mitrofanov, 1972; Bryobia tuttle is miley & Baker, 1995 and Tetranychus urticae Koch, 1836.
    Podczas badań faunistycznych w latach 2009–2011w prowincji Kerman (Południowy Iran), badano faunę roztoczy na roślinach z rodzaju Artemisia (Asteraceae). Stwierdzono sześć gatunków roztoczy należących do nadrodziny tetranychoidea. Odnotowano nowy gatunek żywicielski – Artemisia aucheri (Asteraceae) dla czterech gatunków: Bryobia chrysocomae Meyer, 1974; Strunkobia pamirica Livshitz & Mitrofanow, 1972; B. tuttlei Smiley & Baker, 1995 i Tetranychus urticae Koch, 1836.
    Źródło:
    Zeszyty Naukowe Uniwersytetu Szczecińskiego. Acta Biologica; 2013, 20
    1230-3976
    Pojawia się w:
    Zeszyty Naukowe Uniwersytetu Szczecińskiego. Acta Biologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functional response of habrobracon Hebetor Say (Hym.: Braconidae) to mediterranean flour moth (Anagasta Kuehniella Zeller), in response to pesticides
    Autorzy:
    Mahdavi, V.
    Saber, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/66233.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    The functional response is a behavioral phenomena defined as the relation between the parasitized host per each parasitoid and host density. This phenomenon can be useful in assessing parasitoid efficiency for the biological control of the host. Parasitoid wasps are most important insects and they play a significant role in the natural control of pests via their parasitism activities. In this study, the effects of diazinon and malathion were evaluated on the functional response of Habrobracon hebetor Say to different densities of last instar larvae of Anagasta kuehniella Zeller. Young adult females (< 24 h old) of the parasitoid were exposed to LC30 values of pesticides. Host densities of 2, 4, 8, 16, 32, and 64 were offered, to treated young females for 24 h in 10 cm Petri dishes. At this point, the parasitism data were recorded. The experiments were conducted in eight replications. The functional response was type Ш in the control and insecticide treatments. Searching efficiency in the control, diazinon and malathion-treated wasps were 0.008±0.002, 0.003±0.002, and 0.004±0.002 h-1, handling times were 1.38±0.1, 7.95±0.91, and 6.4±0.81 h, respectively. Diazinon and malathion had the highest and the lowest effect on searching efficiency of H. hebetor, respectively. After conducting advanced field studies, it was found that malathion may be used as a compatible chemical material with biological control agent in IPM programs.
    Źródło:
    Journal of Plant Protection Research; 2013, 53, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Void fraction and flow regime determination by means of MCNP code and neural network
    Autorzy:
    Rabiei, A.
    Shamsaei, M.
    Kafaee, M.
    Shafaei, M.
    Mahdavi, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/146656.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    flow regime
    gamma-ray densitometry
    neural network (NN)
    Monte Carlo N-particle (MCNP)
    void fraction
    Opis:
    One of the non-intrusive and accurate methods of measuring void fraction in two-phase gas liquid pipe flows is the use of the gamma-transmission void fraction measurement technique. The goal of this study is to describe low-energy gamma-ray densitometry using an 241Am source for the determination of void fraction and flow regime in water/gas pipes. The MCNP code was utilized to simulate electron and photon transport through materials with various geometries. Then, a neural network was used to convert multi-beam gamma-ray spectra into a classification of the flow regime and void fraction. The simulations cover the full range of void fraction with Bubbly, Annular and Droplet flows. By using simulation data as input to the neural networks, the void fraction was determined with an error less than 3% regardless of the flow regime. It has thus been shown that multi-beam gamma-ray densitometers with a detector response examined by neural networks can analyze a two-phase flow with high accuracy.
    Źródło:
    Nukleonika; 2012, 57, 3; 345-349
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel high-swing high-speed with 187 µW power consumption Common-Mode Feedback Block (CMFB) based on rail-to-rail technique
    Autorzy:
    Mahdavi, S.
    Noruzpur, F.
    Ghadimi, E.
    Khanshan, T. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/397734.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    common-mode feedback
    high-speed
    low voltage
    folded cascode
    high swing
    sprzężenie zwrotne dla sygnału wspólnego
    niskie napięcie
    kaskoda odwrócona
    Opis:
    This paper presents a new high-swing, high-speed and low power continuous-time Common-Mode Feedback Block (CMFB) based on rail-to-rail technique. The main purposes of the proposed idea are to achieve high-speed, low settling time error, large output swing, and low power as well. Moreover, applying the worst case simulation (initial condition 0 and 1.8 volts) on the proposed CMFB circuit, the output voltage can be settled in the desired level just after 1.18ns noticeably. The settling time error and the power consumption of the suggested common-mode feedback circuit are just 103|iV and 187µW with the power supply of 1.8 volts respectively. Meanwhile, DC gain and phase margin of the amplifier are 74dB and 67 degree correspondingly, and 0.5pF capacitor load is applied to the output nodes of the amplifier. It is noteworthy that, the proposed idea is a good candidate for low voltage applications too. Because it just needs 2 overdrive voltage (AV) to start its performance. Applying the proposed idea on the folded cascode amplifier it achieves SNDR of 68.68dB with the Effective Number of Bits (ENOB) 11.15 bits respectively. The proposed CMFB occupies an active area of 155.58µm2 (10.56µm*14.73µm). Finally, the proposed structure is simulated in whole process corner condition and different temperatures from -70°C to +70°C. Simulation results are performed using the HSPICE BSIM3 model of a 0.18µm CMOS technology.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2017, 8, 2; 50-56
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    1.25GS/S 12bit and 2.27mW digital to analog converter (DAC) with 70.22 SNDR based on new hybrid R-C procedure in 180nm CMOS
    Autorzy:
    Mahdavi, S.
    Poreh, M.
    Alizadeh, L.
    Moradkhani, B.
    Ebrahimi, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/398146.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    SAR ADC
    DAC
    high-resolution
    power consumption
    high-speed
    wysoka rozdzielczość
    pobór mocy
    Opis:
    This paper presents a novel fully differential high-speed and high-resolution Digital to Analog Converter (DAC) based on new reliable hybrid R-C technique. In the proposed idea the four LSB bits and eight MSB bits are implemented as a resistor string and new merged capacitor technique respectively. Applying the suggested method the SNDR and Effective Number of Bits (ENOB) of the proposed DAC achieve 70.22dB and 11.41 bit at the 1.25GS/s sampling rate correspondingly. In the proposed method the total capacitors of the 8 MSB bits are reduced up to 78% compared to the conventional one noticeably. As a result, the power consumption and speed of the suggested DAC are decreased and increased respectively. Moreover, the total power consumption of the proposed DAC is 2.27mW with the power supply of 1.8 volts as well. Meanwhile, for the correctness of the proposed 12bit DAC, 200 iterations in transient Monte-Carlo analysis (parasitic capacitance included ([symbol] mismatch = 1.2%)), and the SNDR simulation results versus different input frequency at fS=1.25GS/s sampling rate are applied too. The maximum Integral Nonlinearity (INL) and the maximum Differential Nonlinearity (DNL) are -0.47/+0.35LSB and -0.42/+0.29 LSB respectively. The proposed DAC structure is simulated in all process corners and performed using the HSPICE BSIM3 model of a 0.18μm CMOS technology.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2017, 8, 4; 127-132
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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