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Статті в журналах з теми "Modules de type de Jordan constant"
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Liu, Qi, Anwarud Din, and Yongjin Li. "Some aspects of generalized von Neumann-Jordan type constant." AIMS Mathematics 6, no. 6 (2021): 6309–21. http://dx.doi.org/10.3934/math.2021370.
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Ghanem, Fatima. "Geotechnical Engineering Evaluation of Superficial Deposits Utilizing Seismic Methods at Al al-Bayt University, Jordan." Iraqi Geological Journal 54, no. 1D (April 30, 2021): 11–28. http://dx.doi.org/10.46717/igj.54.1d.2ms-2021-04-22.
Повний текст джерелаАнотація:
Integration of seismic refraction tomography and multi-channel analyses shear wave methods were used at Al al-Bayt university campus in Mafraq, NE Jordan to delineate the shallow subsurface layering and determine their geotechnical properties, in addition, to estimate the geotechnical engineering parameters of the superficial deposits for detailed purposes. The P-wave refraction velocities were found to range from 180 to 2300 m/s for the three identified layers which indicating superficial soil deposits with an increasing degree of compaction with depth. The S-wave velocities were found to lie in a narrow velocity range (250 to 600 m/s), which badly resolved the subsurface layering. Moreover, four soil samples were taken from the sites of seismic survey points for density calculations. The average calculated density was found to be 1.85 g/cm3. Two soil samples from nearby seismic profile-1 and seismic profile-4 were tested for geotechnical properties. The results showed that the seismic method is an effective tool to estimate the different elastic moduli; Poisson's ratio, Young's modulus, Bulk modulus, Shear modulus, Lame's constants, and geotechnical engineering parameters; N-value, bearing capacity, material index, concentration index, and stress ratio of the superficial soil deposits. The study recommends conducting a detailed geophysical study before starting any type of geoengineering construction in the area.
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Zuo, Zhanfei, Liang ei Wang, Yong-Xiang Zhao, and Yan-Qiu Wu. "On the generalized von Neumann-Jordan type constant for some concrete Banach spaces." Mathematical Inequalities & Applications, no. 3 (2021): 597–615. http://dx.doi.org/10.7153/mia-2021-24-42.
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Cabral, Matheus M., Sofia A. Lemes, Marcelo E. de Oliveira, Paulo H. A. Silva e Silva, and Ghunter P. Viajante. "Software for calculating the optimum tilt angle of PV modules in different latitudes of the Southern hemisphere and solar plant sizing." Renewable Energy and Power Quality Journal 19 (September 2021): 304–9. http://dx.doi.org/10.24084/repqj19.282.
Повний текст джерелаАнотація:
Through the development of photovoltaic technologies, the market related to this type of renewable energy grows constantly. In Brazil, the generated power through photovoltaic (PV) power stations approximates to 2.3 GW representing 1.3% of the total Brazilian energy mix. To supply the public it is necessary to offer tools that facilitate consumer decision making or even the work of a solar farm designer. By analyzing the user’s necessity, it is possible to determine that a great parcel needs a quick and simple response to help them with their questions, and programs that are already well established in the marketplace are complex for inexperienced users. For this reason, a software that calculates the best inclination for PV modules using the method proposed by Liu and Jordan in 1962 is developed. It also determines the number of modules that can be installed without any shading between arrays within a user-defined area. This calculation is possible through the standard dimensions provided by the module manufacturers and the solar height and declination study. Through a simple interface, the user quickly receives the optimum tilt angle of installation, the number of PV modules and the maximum generated power.
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Ballardini, Mario, Fabio Finelli, and Domenico Sapone. "Cosmological constraints on the gravitational constant." Journal of Cosmology and Astroparticle Physics 2022, no. 06 (June 1, 2022): 004. http://dx.doi.org/10.1088/1475-7516/2022/06/004.
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Abstract We study the variation of the gravitational constant on cosmological scales in scalar-tensor theories of gravity. We focus on the simplest models of scalar-tensor theories with a coupling to the Ricci scalar of the form F(σ) = N 2 pl + ξσ 2, such as extended Jordan-Brans-Dicke (N pl = 0), or a non-minimally coupled scalar field with N pl = M pl, which permits the gravitational constant to vary self-consistently in time and space. In addition, we allow the effective gravitational constant on cosmological scales to differ from the Newton's measured constant G, i.e. G eff(z = 0) = G(1+Δ)2. We study the impact of this imbalance Δ jointly with the coupling ξ into anisotropies of the cosmic microwave background and matter power spectrum at low-redshift. Combining the information from Planck 2018 CMB temperature, polarization and lensing, together with a compilation of BAO measurements from the release DR12 of the Baryon Oscillation Spectroscopic Survey (BOSS), we constrain the imbalance to Δ = -0.022 ± 0.023 (68% CL) and the coupling parameter to 103 ξ < 0.82 (95% CL) for Jordan-Brans-Dicke and for a non-minimally coupled scalar field with F(σ) = M 2 pl + ξσ 2 we constrain the imbalance to Δ > -0.018 (< 0.021) and the coupling parameter to ξ < 0.089 (ξ > - 0.041) both at 95% CL. With current data, we observe that the degeneracy between Δ, the coupling ξ to the Ricci scalar, and H 0 allows for a larger value of the Hubble constant increasing the consistency between the distance-ladder measurement of the Hubble constant from supernovae type Ia by the SH0ES team and its value inferred by CMB data. We also study how future cosmological observations can constrain the gravitational Newton's constant. Future data such as the combination of CMB anisotropies from LiteBIRD and CMB-S4, and large-scale structures galaxy clustering from DESI and galaxy shear from LSST reduce the uncertainty in Δ to σ(Δ) ≃ 0.004.
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Muchie, Zelalem. "THE FALSE PROMISE OF COOPERATION IN THE JORDAN RIVER: STATE POLICIES AND DETERMINANTS." RUDN Journal of Political Science 21, no. 2 (December 15, 2019): 295–310. http://dx.doi.org/10.22363/2313-1438-2019-21-2-295-310.
Повний текст джерелаАнотація:
The study examines the false promise of cooperation in the Jordan River basin through the prism of state policies and determinants. The study is underpinned by the significance of pivotal riparian states. Based on their preeminence in determining the course of cooperation, the study considers Israel, Jordan and Palestine as pivotal riparian states. In terms of research methodology, qualitative approach was used. The study identified that domestic politics, regional dynamics and international water regimes are major determinant factors making cooperation to be a fantasy. Israel’s doctrine of exceptionalism both in the sense of statehood and government type and the reciprocated denial of co-basin states in this regard are domestic political factors that impede the course cooperative events. Israel’s geopolitical calculations via territorial expansion alongside of the Jordan River affect the cooperative milieu. The mere existence of water regimes either in the form of legal agreements or institutional attempts, does not bring effective cooperation. The finding of study shows that, domestic politics, regional dynamics and international water regimes are indeed determinant factors for the cooperative and conflictive nature of water sharing in the basin. The level of their impact however is neither equal nor constant. Importantly, these three factors affect and condition one another.
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Boulad, Natalia, Sattam Al Shogoor, Wahib Sahwan, Nedal Al-Ouran, and Brigitta Schütt. "Systematic Conservation Planning as a Tool for the Assessment of Protected Areas Network in Jordan." Land 11, no. 1 (December 31, 2021): 56. http://dx.doi.org/10.3390/land11010056.
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The present study aims to use systematic conservation planning to analyse and review the national protected areas (PAs) network in Jordan. The analysis included the application of three modules: the environmental risk surface (ERS), the relative biodiversity index (RBI), and the application of Marxan. The methodology was based on using Marxan to achieve solutions for three scenarios for the PAs network. Marxan was applied to the input data, which included vegetation types, distribution of threatened mammals and plants, locations of currently established PAs and other types of designations. The first two scenarios aimed to conserve 4% and 17%, respectively, of each vegetation type, and 10% and 20%, respectively, of the extent of occurrence of threatened mammals and plants. The third scenario aimed to conserve 17% of each vegetation type and 10% of the extent of occurrence of threatened plants and mammals, except for forest and the Hammada vegetation which had the target of 30% and 4%, respectively. The results of the three scenarios indicated that the boundaries of existing reserves should be extended to achieve the conservation targets. Some currently proposed (PAs), such as the Aqaba Mountains, did not appear in any of the solutions for the three scenarios indicating that the inclusion of these sites in the proposed (PAs) network should be reconsidered. All three scenarios highlighted the importance of having conservation areas between the western and eastern parts of the country. Systematic conservation planning is a structured, replicable, transparent, and defensible method for designing PA networks. It allows for finding efficient solutions building on what is currently conserved and minimizing the fragmentation and cost of the proposed solution for conservation areas.
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Dmitrikov, Vladimir F., Alexander Yu Petrochenko, and Andrey A. Rozanov. "Design features of negative feedback and power smoothing filter of the DC / DC converter with pulse loads for transmitter-receiver modules of active electronically scanned arrays." Physics of Wave Processes and Radio Systems 24, no. 1 (May 6, 2021): 78–88. http://dx.doi.org/10.18469/1810-3189.2021.24.1.78-88.
Повний текст джерелаАнотація:
The fundamental difference of the voltage converter of the secondary power supply source for the transmitter-receiver modules of active electronically scanned arrays with impulse load and variable duty cycle from traditional voltage converters that constantly consume power from the primary network is shown. Methods for improving the quality of transient processes in voltage converter with constant power consumption during start-up by soft start are not applicable to improve the quality of transients in periodic current pulses caused by a pulsed load. Since any ripples, noises, instabilities in the power supply of the transmitter-receiver modules of active electronically scanned arrays operating in a linear mode lead to parasitic amplitude modulation of the emitted signal and to a deterioration in the quality of selection and target tracking, very strict requirements are imposed on the quality of the transmitter-receiver modules supply voltage (voltage ripple kп 0,5 %, the amount of overshoot of the output voltage sU 2 %, etc.). The article shows that such a quality of the output voltage with a pulsed load of the transmitter-receiver modules of active electronically scanned arrays can be obtained using a lower-type voltage converter, with a double-circuit negative feedback for the output voltage and current of the inductor, with a storage capacitor and with a power smoothing filter with the characteristics of Chebyshev and Butterworth. The work investigated the influence of the negative feedback depth on the output voltage and current of the smoothing filter choke, the value of the storage capacitor capacity, the type and parameters of the smoothing filter, and recommendations were given to select their optimal values, at which the required quality of the supply voltage for the transmitter-receiver modules of active electronically scanned arrays was ensured, taking into account the minimization of their dimensions.
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Hung, San Shan, Hsing Cheng Chang, and Chan Ming Liang. "Design of the Liquid-Cooling System for High Power LED Modules Using Taguchi Analysis." Advanced Materials Research 383-390 (November 2011): 6416–21. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.6416.
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To optimize thermal dissipation efficiency for cooling high power LED modules is studied and analyzed using ANSYS CFX software and Taguchi method. In liquid-cooling system, four control factors are tested and compared in order to find the best cooling arrangement that are pump flow rate, fan power, cooling liquid type and k- value of thermal compound. The experimental results show that the importance of these cooling parameters applied to high power LED module are k-value of thermal compound, fan power, liquid type and pump flow rate in sequence. For a constant heating power of 90W from an LED lighting module, an optimal thermal resistance of 0.563K/W is obtained that shows a significant improved result then the conventional LED module’s. It has high potential in future high power LED applications.
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Dobrzycki, Arkadiusz, Dariusz Kurz, and Ewa Maćkowiak. "Influence of Selected Working Conditions on Electricity Generation in Bifacial Photovoltaic Modules in Polish Climatic Conditions." Energies 14, no. 16 (August 13, 2021): 4964. http://dx.doi.org/10.3390/en14164964.
Повний текст джерелаАнотація:
This paper discusses the conversion of solar irradiance energy into electricity. Double-sided (bifacial) panels are gaining increasing popularity in commercial applications due to the increased energy yield with a constant occupied mounting surface. However, the value of the additional energy yield produced by the back of the panel depends on several important factors. This paper presents the influence of working conditions on electricity generation in bifacial modules. This paper also investigates the influence of weather conditions, the module inclination angle, and the substrate beneath the panel surface on electricity generation. Fill factor and efficiency were calculated for each case included in the study scope. Based on the current voltage, power characteristics, and calculations, the module operation for different conditions was compared. It was observed that the optimal inclination angle to the surface is higher for the bifacial modules compared to the unilateral modules. The type of surface under the module has also been indicated to impact the amount of electricity generated. The additional energy yield associated with the panels’ rear side accounts for 2% to more than 35% of the total power generated by a photovoltaic (PV) module. The unit cost of electricity generation in the analyzed cases was also determined.
Дисертації з теми "Modules de type de Jordan constant"
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Eimer, Alexandre. "De quelques modules de Galois sur les corps locaux." Thesis, Strasbourg, 2021. https://publication-theses.unistra.fr/public/theses_doctorat/2021/Eimer_Alexandre_2021_ED269.pdf.
Повний текст джерелаАнотація:
Soient $p$ un nombre premier et $\mathbf{k}$ un corps local contenant une racine primitive $p$-ième de l'unité notée $\xi_p$. Donnons-nous alors $\mathbf{K}/\mathbf{k}$ une $p$-extension galoisienne finie de groupe de Galois $G$. Notre objectif premier est d'étudier la structure de $G$-module de $J(\mathbf{K})=\mathbf{K}^{\times}/\mathbf{K}^{\times p}$. Pour ce faire, nous utilisons les outils donnés par la théorie des modules de type de Jordan constant mais nous calculons aussi les groupes de cohomologie avec des coefficients dans $J(\mathbf{K})$, sous certaines hypothèses. De surcroît, lorsque $\mathbf{K}/\mathbf{k}$ est l'extension $p$-élémentaire abélienne maximale, nous tirons profit de notre étude pour calculer quelques invariants pertinents précédemment introduits pour $p=2$Let $p$ be a prime number and $\mathbf{k}$ a local field such that $\mathbf{k}$ contains a primitive $p$-th root of unity denoted $\xi_p$. Set $\mathbf{K}/\mathbf{k}$ a finite Galois $p$-extension. Let $G$ denote its Galois group. Our main goal is to study the $G$-module structure of $J(\mathbf{K})=\mathbf{K}^{\times}/\mathbf{K}^{\times p}$. To do so, we use the theory of modules of constant Jordan type and we also compute the cohomology groups of $G$ with coefficients in $J(\mathbf{K})$ under some hypothesis. Furthermore, when $\mathbf{K}/\mathbf{k}$ is the maximal $p$-elementary abelian extension, we take profit of our study in order to compute some invariants which were previously introduced for $p=2$
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Baland, Shawn. "Some results on modules of constant Jordan type for elementary abelian-ρ-group". Thesis, University of Aberdeen, 2012. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=192251.
Повний текст джерелаАнотація:
Let E be an elementary abelian p-group of rank r and k an algebraically closed field of characteristic p. We investigate finitely generated kE-modules of stable constant Jordan type [a][b] with 1 ≤ a, b ≤ p − 1 using the functors Fi from finitely generated kE-modules to vector bundles on the projective space Pr−1 constructed by Benson and Pevtsova. In particular, we study relations on the Chern numbers of the trivial bundle M to obtain restrictions on a and b for sufficiently large ranks and primes. We then study kE-modules with the constant image property and define the constant image layers of a module with respect to its maximal submodule having the constant image property. We prove that almost all such subquotients are semisimple. Focusing on the class of W-modules in rank two, we also calculate the vector bundles Fi(M) for all W-modules M. For E of rank two, we derive a duality formula for kE-modules M of constant Jordan type and their generic kernels K(M). We use this to answer a question of Carlson, Friedlander and Suslin regarding whether or not the submodules J−iK(M) also have constant Jordan type for all i ≥ 0. We show that this question has an affirmative answer whenever p = 3 or J2K(M) = 0. We also show that it has a negative answer in general by constructing a kE-module M of constant Jordan type for p ≥ 5 such that J−1K(M) does not have constant Jordan type. Finally, we use ideas from a theorem of Benson to show that if M is a kE-module of constant Jordan type containing no Jordan blocks of length one, then there always exist submodules of J−1K(M)/J2K(M) having a particularly nice structure.
Частини книг з теми "Modules de type de Jordan constant"
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Carlson, Jon F., and Eric M. Friedlander. "Exact Category of Modules of Constant Jordan Type." In Algebra, Arithmetic, and Geometry, 267–90. Boston: Birkhäuser Boston, 2009. http://dx.doi.org/10.1007/978-0-8176-4745-2_6.
Повний текст джерелаТези доповідей конференцій з теми "Modules de type de Jordan constant"
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AlMukhtar, Basil, Paul Harriman, and Kieran Burke. "The analysis of multi-phase current feedforward type-III constant on-time control with ultrafast load transient response for voltage regulator modules." In 2016 IEEE International Conference on Electronics, Circuits and Systems (ICECS). IEEE, 2016. http://dx.doi.org/10.1109/icecs.2016.7841167.
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Soloviev, Arcady, Anton Bychkov, and Maria Shevtsova. "Determination of Full Set Elastic Constants for Composite Materials on Basis of Frequency Response Analysis, FEA, and GA." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59556.
Повний текст джерелаАнотація:
The number of engineering problems includes the identification of anisotropic composite elastic constants determination. We developed an experimentally - analytical technique for identification of all elastic constants of orthotropic materials. The offered technique is substantially based on measurement of eigenfrequencies and semi quantitative analysis of natural vibration modes, instead of wave propagation speed and fields of vibrational displacement used by other acoustic methods. The developed method of the elastic composite and piezoelectric materials properties identification is implemented in linked MATLAB – Comsol Multiphysics combining the finite element analysis (FEA) of oscillations dynamics and minimization of some functional, which type is determined by particularity of a solved problem. These techniques complement the early designed by authors’ FEM-based methods for orthotropic composite static tests. The offered dynamic tests include an evaluation of specimen’s frequency response, determination of natural frequencies and vibration modes of specimens both in natural experiments and numerical finite element simulations. The identification process consists of several stages. In series of static tests are determined all allowable modules. Further a complete matrix of elastic constant is constructed, but some modules specified by approximated values (in particular, interlaminar shear modules). A series of dynamic tests executed in which the periodical excitation of samples and the frequency response is recorded by means of piezoelectric actuators and sensors. Then on basis of early defined (in static tests and with use of mix rule) modules of composite and experimentally founded eigenfrequencies by means of FEM the vibration natural modes are identified. By combination of FEM, genetic algorithm (GA) and Levenberg-Marquardt minimization method the specification of composite mechanical properties is evaluated. Application of developed technique to orthotropic composite used in aviation structures (polymeric composite spar of the helicopter main rotor blade) is explicitly illustrated. The obtained results have shown a good efficiency of proposed identification methods. We demonstrate that proposed approach provides best reliability and shows small dependence on metering equipment precision.
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Hoekstra, Carel, Henk Smienk, Joris van Drunen, and Alessio Pistidda. "Applying CFD for In-Line Structure Hydrodynamics in Pipeline Installation Analysis." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54273.
Повний текст джерелаАнотація:
Over the last decade Heerema Marine Contractors (HMC) has successfully performed multiple installation campaigns of large sized in-line structures (ILS) with Deep Water Construction Vessels (DCV) Aegir and Balder. Nowadays steady increase in size and weight of ILS have made these special operations even more complex. Presence of large sized ILS and accompanying buoyancy modules in the catenary have proven to play a dominant role in pipeline integrity. Originally hydrodynamic force formulations in finite element analysis are solely designated for the pipeline itself. These computations comprehend the application of the Morison equation using constant hydrodynamic coefficients of basic shapes in steady flow. Therefore hydrodynamic forces acting on the ILS, characterized by irregular relative motions of a complex shaped and perforated structure, are highly simplified while playing a dominant role in the analyses. Validity of applying the standard Morison equation is debatable, since large ILS cannot be assumed slender. Nonetheless Morison type formulations can provide reasonable results depending on the accuracy of the hydrodynamic coefficients. Deriving these coefficients for complex shaped structures using industry standards is a highly interpretive process involving an accumulation of assumptions. This approach yields varying coefficients, which are applied conservatively in installation analyses, resulting in an unnecessary reduction of DCV offshore workability. To improve workability of these complex installations, HMC has implemented an ILS specific hydrodynamic profile from Computational Fluid Dynamics (CFD) analysis into the installation analyses. This is effectuated by the development of an enhanced methodology with a dedicated hydrodynamic formulation for large perforated ILS. Dependencies on Keulegan-Carpenter (KC) number and local angle of attack are addressed in this formulation to respectively cover the inertia dominated oscillating motions and complex geometric composition. The applied hydrodynamic formulation is based on work of Molin et al. which showed a good agreement to the CFD analysis performed for this study. Development and application of this methodology is initiated as a first assessment towards more accurate ILS installation analyses. Analysis of a study case shows reductions up to 50% of maximum bending strain in a specific regular wave analysis. From the work presented it is concluded that the industry practice vastly overestimates hydrodynamic forcing on large sized ILS. Complementary research is needed on the topics of oscillations for low (<1.0) KC number, effects of relative fluid velocity and finally the implementation of irregular waves.