858 research outputs found
First data on the taxonomic diversity of the Portulaca oleracea aggregate (Portulacaceae) in Iran
No full textThe review of specimens from Iran belonging to the Portulaca oleracea L. aggregate resulted in the recognition of six microspecies: P. cypria Danin, P. granulatostellulata (Poelln.) Ricceri & Arrigoni, P. nitida (Danin & H.G.Baker) Ricceri & Arrigoni, P. rausii Danin, P. socotrana Domina & Raimondo, and P. trituberculata Danin, Domina & Raimondo, all reported for the first time for the flora of Iran. The identification was based on the microscopic study of seeds. It is noted that P. oleracea is not confirmed for Iran. Distribution data and an identification key for Portulaca microspecies in Iran are presented
RAD-3 SUBMILLIMETER-WAVE SEPECTRUM OF ACETALDEHYDE
No full text S.P. Below V.M. Demkin A.F. Krupnov and M. Yu. Tretyakov Xth International Conference on High Resolution Infrared Spectroscopy, Liblice, Czechoslvakia, 1988. I. Kleiner, M. Godefroid. M. Herman and A.R. W. McKellar, J. Mol. Spectrosc. 142, 238 (1990). I. Kleiner, J.T. Hougen, R.D. Suenram, F.J. Lovas and M. Godefroid, J. Mol. Spectrosc. 148, 38 (1991) Kleiner, J.T. Hougen, R.D. Suenram, F.J. Lovas and M. Godefrold, J. Mol. Spectrosc. 153, 000 (1992).Author Institution: Molecular Spectroscopy laboratory, Applied Physics Institute; Molecular Physics Division, National Institute of standards and Technology; Laboratoire de Physique Mol\'{e}culaire at Applications, Universit\'{e} Pierre et Marle curie et C.N. R.S.A broad-band room-temperature submillimeter wave spectrum containing approximately 5000 lines of in the region from 165 to 417 GHz has been recorded with the RAD-3 in Nizhni Novgorod (formerly Gorky). The sample pressure of approximately 0.1. Torr leads to typical linewidths of 8 MHz, which when combined with some uncertainties in the frequencies used for calibration. Leads to measurement uncertainties of less than 1 MHz for unblended lines. We shall describe the instrument in some detail. Pure rotational transitions with J values from 10 to 20, originating in the torsional ground () and first excited () states, can be relatively easily identified using computer programs and molecular parameters determined in earlier . Because of the broad-band spectral coverage of the RAD-3 spectrometer, these assigments can be confirmed in most cases by ``combination-difference loops” of 4 lines, whose frequencies sum to values less than Times the 1 MHz measurement precision. The goal of the present work is not a study of and 1 transition, however, but involves instead a search for lines originating in higher ( or 3) torsional states. We shall report on our attempts to find such lines in this RAD-3 spectrum
The conflict between idealism and realism in the cinema of Mohammad Hossein Mahdavian; The analysis of three films “Lottery”, “Rad-e-Khoon”, and “Majaraye Nimrooz”
No full textThe intricate dynamic between idealism and realism, coupled with the challenges of regulating their interrelation, plays a major role in forming social structures and community life. Post-revolutionary systems, having successfully redefined prevailing conditions through the proposition of an idealized state, confront the difficult challenge of defining new paradigms that are consistent with this ideal. Cinema, as a social institution, by means of its narrative language can address profound social dilemmas and actively participate in the representation and organization of conflicts inherent in collective existence, most notably the ideological discord between idealism and realism.Several generations of Iranian filmmakers in the post-Islamic revolution cinema through the perspective of their ideology have concentrated on this issue and provided various interpretations of the dynamic tension between idealistic ambitions and pragmatic reality. In this study, three feature films, “Lottery”, “Majaraye Nimirroz [Midday Adventures]”, and “Rad-e Khoon [Trace of Blood]” by Mohammad Hossein Mahdavian, one of the young directors of Iran who have explored this conflict, are examined through an analytical lens influenced by John Fiske methodology. The findings reveal that in these films idealism manifests itself in conscientiousness, Jihad, and principlism, while realism is represented in concepts such as pragmatism, pacifism, and tolerance. Although the filmmaker seems to favor pragmatic ideas, he perceives both idealism and realism as fundamentally deficient in isolation
Endemic and Rare Species of Cyperaceae Family in Iran
No full textCyperaceae, with about 131 species, is the largest family of subclass Monocotyledoneae in Iran after Poaceae and Liliaceae. In this research, endemic and rare plants belonging to Cyperaceae family has been studied in Iran. Cyperus celans and Carex decaulescens subsp. brunneola are endemic plants. Number of 36 taxa has been surveyed as threatened plants. Also, phytogeographical region, index of threatened, life form, habitat, and distribution map has been prepared for each taxon
TEMPERATURE DEPENDENCE Of THE RADIATIVE LIFETIME OF J-AGGREGATES WITH DAVYDOV SPLITTING OF THE EXCITATION BAND
No full text I. G. Seheblykin, M. M. Bataiev, M. Van der Auweraer, A. G. Vitukhnovsky, Chem. Phys. Lett. 316, 37-44 (2000)Author Institution: Lebedev Physical Institute; Laboratory for molecular Dynamics and SpectroscopyThe temperature dependence of the radiative exciton lifetime of J-aggregates of -dichloro-9-ethylthiacarbocyanine (THIATS) characterized by a Davydov splitting of the exciton band has been determined over the temperature range from 4.2 to The Davydov splitting of the exciton was taken into account during the calculation of the coherent length from the values of ). The dependence of ) on temperature was analyzed. The (T) of J-aggregates of THIATS can be rationalized within the framework of a 1-D excitation model
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Influence of diluent alkyl substitution on the extraction of Am(III) and Eu(III) by a 6,6’-bis(1,2,4-triazin-3-yl)-2,2’-bipyridine ligand dissolved in alkylated cyclohexanone Diluents
No full textSeveral alkylated cyclohexanones were investigated as potential diluents for the selective extraction of Am(III) from Eu(III) from nitric acid solutions by the CyMe4-BTBP ligand. No significant extraction of either of the metal ions was observed for these diluents themselves. In the extractions from 1 M HNO3, 3-methylcyclohexanone and 4-methylcyclohexanone gave comparable results to cyclohexanone whereas in the extractions from 4 M HNO3, 2-methylcyclohexanone, 3-methylcyclohexanone and 4-methylcyclohexanone all gave superior results. For the monomethylated diluents, DAm and SFAm/Eu decreased in the order of alkyl substitution 2 > 4 ~ 3. However, alkyl substitution of cyclohexanone significantly slows down the extraction kinetics compared to cyclohexanone, and the position of alkyl substitution was found to play an important role in the solvents properties. 3-Methylcyclohexanone was identified as the most promising of the diluent
Non-Homogeneous Sampling Rate Wide Area Backup Protection using Synchrophasors and IED Data
No full textFault currents may result in cascading failures and even system collapse if not detected and cleared on time. To account for the possibility of failure of primary protection under stressed system conditions, an extra layer of protection is commonly employed, referred to as backup protection. This paper introduces an effective formulation for realizing remote backup protection using available data from PMUs and Intelligent Electronic Devices (IEDs). The proposed method is split into three main stages. The first stage deals with the zoning detection of the fault. The second stage is aimed at faulted line detection, and finally, the third stage determines the fault distance on the faulted line. The method is designed to take full advantage of measurements provided by PMUs and IEDs. The challenges associated with different reporting rates are resolved thanks to the dynamic decimator employed to this end. The proposed method has been implemented in real-time by applying co-simulation with MATLAB and validated using the New England IEEE 39 bus system with several fault events.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Intelligent Electrical Power Grid
Pressure Adaptive Bellows: A concept for variable stiffness and variable camber
No full textThe introduction of metal into the aeronautical industry made the wings and aerostructures stiff and rigid. High-lift devices and movable surfaces allow for discrete deflections to increase lift coefficient and control of the aircraft. Several researchers have proposed concepts for variable camber, allowing continuous deflections. This is achieved by shape memory alloys, piezoelectric actuators, fishbone structures and pressure adaptive actuation. The concept of variable stiffness is not applied in aviation nowadays. This thesis is focused on applying variable camber and variable stiffness to a Cessna Citation X inboard flap, for which a full scale actuator is produced and tested. The loads are estimated on the inboard flap with the morphing part in neutral, 15 degrees downwards and 15 degrees upwards position. The maximum loads and moments are found in the descent flight condition, which equal 209.7 N and 15.24 N¢m in neutral position. Deflection downwards increases the force and moment to 631.6Nand 37.19N¢m, whereas in upwards position the force and moment equal -253.4Nand -12.68 N¢m. With the expected loads on the trailing edge of the flap, the actuator can be designed. The top bellows are designed 2.62 times larger than the bottom bellows, because of the expected loading ratio. The wedge angles are approximately 30 degrees, which are the maximum angles for deflection in positive and negative direction. The bellows and trailing edge are made from polycarbonate, where the bellows and the inner sheet of the trailing edge have a thickness of 4 mil (0.10 mm) and 6.7 mil (0.17 mm). The trailing edge is made from 30 mil (0.762 mm) polycarbonate sheet. The stringers are replaced by aluminumspars for the test setup. The main issue found in the testing phase, was the air tightness. Even though the bellows were not completely airtight, the bellows could be inflated by applying 10 psi (0.69 bar) air pressure. In the testing phase, the maximum deflections and deflection speeds have been measured. On average 13 degrees upwards deflection and 7 degrees downward deflection is reached. The actuation speed equals 150 deg/s and deflection rates range from 0.88 Hz to 3.33 Hz. The stiffness and damping have been determined as well. The stiffness increases with air pressure, for a 4 mil inner sheet thickness the stiffness increases from 3.46 N¢m/rad to 5.38 N¢m/rad, the 6.7 mil inner sheet increases more, from 3.96 N¢ m/rad to 9.03 N¢ m/rad. It is expected that the stiffness can be varied linearly between the neutral and inflated (10 psi) state. A thicker inner sheet gives a higher stiffness. The damping coefficients are only determined for the 4 mil inner sheet. The damping coefficients equal 0.119 in deflated, 0.143 in neutral and 0.226 in inflated condition. The natural frequency could be determined from the damping test as well. The natural frequency was approximately 2.99 Hz for the deflated and the neutral tests and 3.71 Hz for the inflated tests. The equivalent torsional stiffness corresponding to this natural frequency equals 1.21 N¢ m/rad, 1.24 N¢ m/rad and 1.88 N¢ m/rad for the deflated, neutral and inflated tests respectively. The stiffness and damping coefficients are used in a torsional spring damper differential equation, together with the mass moment of inertia for the trailing edge, which is calculated in CATIA™. The mass moment of inertia equals 0.422 g ¢m2 for the 4 mil and 0.434 g ¢m2 for the 6.7 mil inner sheet. Another analytic model is created as well, determining the deflection from the final shape of the inflated bellows. Since the actuator is still in an early development phase, it is expected that the actuator and analytic models can be improved withmore research and better production techniques.Aerospace EngineeringAerodynamics, Wind Energy & PropulsionFlight Performance and Propulsio
Measurement of the CP-violating phase \phi s in Bs->J/\psi\pi+\pi- decays
No full textMeasurement of the mixing-induced CP-violating phase phi_s in Bs decays is of prime importance in probing new physics. Here 7421 +/- 105 signal events from the dominantly CP-odd final state J/\psi pi+ pi- are selected in 1/fb of pp collision data collected at sqrt{s} = 7 TeV with the LHCb detector. A time-dependent fit to the data yields a value of phi_s=-0.019^{+0.173+0.004}_{-0.174-0.003} rad, consistent with the Standard Model expectation. No evidence of direct CP violation is found
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