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Search Results: 1 - 10 of 49 matches for " Couplings "
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Pneumatic flexible shaft couplings
Jaroslav HOMI?IN
Transport Problems : an International Scientific Journal , 2007,
Abstract: Main effort of every design engineer is reduction of torsional oscillation in any mechanical system. At present this problem can be solved by means of a suitable modification of dynamic properties of flexible shaft couplings according to dynamics in the given systems. But the dynamic properties of nowadays-applied flexible couplings arenot unchangeable because of aging and fatigue processes occurring in flexible coupling elements. Result of this fact causes detuning of mechanical system. Taking into consideration the above-mentioned situation, we suggest for mechanical systems application of a newly developed pneumatic couplings that have constant characteristicfeatures during the whole current operation and thus they have a positive influence on the system running.
COMPARATIVE ANALYSIS OF THE BEHAVIOR OF COAXIAL AND FRONTAL COUPLINGS – WITH PERMANENT MAGNETS – IN HIGH TEMPERATURE ENVIRONMENTS
Ion Voncila,Cristian Munteanu,Razvan Buhosu,Marcel Oanca
Annals of Dunarea de Jos , 2004,
Abstract: This paper presents a comparative analysis of the behavior of coaxial and frontal couplings – with permanent magnets – in high temperature environments specific to iron and steel industry. The comparative analysis is made at the level of the specific forces developed in the most difficult environments. The maximum temperature was limited for reasons of thermal stability of the Nd-Fe-B permanent magnets. In this context it was studied, by the help of the PDE-ase soft that uses the finite element method, the way magnetic induction modifies, the specific forces developed and the distribution of temperature within the coaxial and frontal couplers with permanent magnets, for variations of the distance between the magnets (air gap) within the limits 2-20 mm.
The Behavior Of Asymmetric Frontal Couplings With Permanent Magnets In Magnetic Powder And High Temperature Environments
Ion VONCILA,Nicolae BADEA,Ion DOBROTA
Annals of Dunarea de Jos , 2002,
Abstract: The main purpose of this paper is the comparative analysis of the behavior of frontal couplings with Nd-Fe-B permanent magnets in difficult environments, specific to metallurgy – such as environments with magnetic powders and high temperature – in two constructive variants: symmetric couplings and asymmetric couplings (with divided poles). The results show the superior performance of asymmetric couplings under the given conditions
Coupling Interactions and Trapped Effects for a Triple-Well Potential  [PDF]
Sezgin Ayd?n, Mehmet ?im?ek
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.28106
Abstract: Weak and strong coupling interactions and trapped effects have always played a significant role in understanding physical and chemical properties of materials. Triple-well anharmonic potential may be modeled for interpretation of energy spectra from the nuclear to macro molecular systems, and also crystalline systems. Exact periods of a trapped particle in each well of the potential are explicitly derived. For the extended Duffing system, it is predicted that infinite series of both frequency and spatial trajectory approach to exact results in the limit of weak-coupling cases (g→0).
Relative Reactivities of Activated Carboxylic Acids in Amide-Forming Reactions Employed for the Synthesis of Tetraphenylporphyrin Libraries
Kendra L. Dombi,Clemens Richert
Molecules , 2000, DOI: 10.3390/51201265
Abstract: Presented here is a method for rapidly testing the reactivity of carboxylic acids in amide-forming reactions. For this, a mixture of two acids, one a reference compound, and one acid whose reactivity is unknown, are coupled to an aminoacylated tetrakis(paminophenyl) porphyrin under typical peptide coupling conditions. The product distribution in the resulting library is analyzed via MALDI-TOF mass spectrometry to reveal the relative reactivity. This rapid reactivity test requires sub-nanomole quantities of acids, does not involve cleavage from a support or any potentially biasing work-up, and is automatable. Thus, it is well suited for testing building blocks for combinatorial syntheses. Further, it is demonstrated that step-wise coupling can produce near-statistically distributed libraries of porphyrins when acids of very different reactivity are employed.
Cálculo de deformaciones elásticas en estructuras óptimas bidimensionales para diferentes ensamblajes
Camacho-López,Carlos Julio; Garzón-Alvarado,Diego Alexander;
Ingeniería y Universidad , 2010,
Abstract: this paper presents a method to analyze elastic deformations and stiffness in two-dimensional structures with different assembly configurations among their elements. initially, the optimal structure is obtained through topology optimization, and then a method to analyze different types of connections (hinge, flexible and rigid connections) in structural components is developed. next, two widely documented examples are developed and validated. the versatility of the method and its functionality during both the design process and the selection of the best assembly option are determined. this work contributes to analyzing structures with different interconnection setups among their elements. existing work is complemented through both the integration of topological design and the choice of the best setup features for a number of cases where assembly and design requirements are related.
Coupling, spectral gap and related topics (III)
Chen Mufa
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882917
Abstract:
Coupling, spectral gap and related topics (I)
Mufa Chen
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882858
Abstract:
Coupling, spectral gap and related topics (II)
Mufa Chen
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02883046
Abstract:
Finite Unification: Theory and Predictions
Sven Heinemeyer,Myriam Mondragón,George Zoupanos
Symmetry, Integrability and Geometry : Methods and Applications , 2010,
Abstract: All-loop Finite Unified Theories (FUTs) are very interesting N=1 supersymmetric Grand Unified Theories (GUTs) which not only realise an old field theoretic dream but also have a remarkable predictive power due to the required reduction of couplings. The reduction of the dimensionless couplings in N=1 GUTs is achieved by searching for renormalization group invariant (RGI) relations among them holding beyond the unification scale. Finiteness results from the fact that there exist RGI relations among dimensionless couplings that guarantee the vanishing of all beta-functions in certain N=1 GUTs even to all orders. Furthermore developments in the soft supersymmetry breaking sector of N=1 GUTs and FUTs lead to exact RGI relations, i.e. reduction of couplings, in this dimensionful sector of the theory too. Based on the above theoretical framework phenomenologically consistent FUTS have been constructed. Here we present FUT models based on the SU(5) and SU(3)^3 gauge groups and their predictions. Of particular interest is the Higgs mass prediction of one of the models which is expected to be tested at the LHC.
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