1,433 research outputs found
Muslim Ritual Practices and their Multilayered Messages in a Non-Muslim Environment: Examples from the Dutch Context
Many Muslims in the Netherlands want to live according to the prescriptions of their religion, but are trying at the same time to accommodate themselves to Dutch society in everyday life. Accommodation also seems to occur in the area of Muslim ritual practices, even though most orthodox and orthoprax Muslims are convinced of the 'unchangeability' of Islamic rituals. The study of Islamic rituals and changes in them in a non-Muslim Western environment have therefore become very popular among Western researchers. Most studies have focused on the relation between ritual, social cohesion and group identity. By focusing on certain Muslim ritual practices in the mon-Muslim environment of the Netherlands, this article draws attention to the role of ritual as an expression of faith on part of the individual beliver, thus stressing the multilayered messages conveyed by ritual practices
Two-color multiphoton emission from nanotips
Two-color multiphoton emission from polycrystalline tungsten nanotips has been demonstrated using two-color laser fields. The two-color photoemission is assisted by a three-photon multicolor quantum channel, which leads to a twofold increase in quantum efficiency. Weak-field control of twocolor multiphoton emission was achieved by changing the efficiency of the quantum channel with pulse delay. The result of this study complements two-color tunneling photoemission in strong fields, and has potential applications for nanowire-based photonic devices. Moreover, the demonstrated two-color multiphoton emission may be important for realizing ultrafast spin-polarized electron sources via optically injected spin current
Two-color multiphoton emission from nanotips
Two-color multiphoton emission from polycrystalline tungsten nanotips has been demonstrated using two-color laser fields. The two-color photoemission is assisted by a three-photon multicolor quantum channel, which leads to a twofold increase in quantum efficiency. Weak-field control of twocolor multiphoton emission was achieved by changing the efficiency of the quantum channel with pulse delay. The result of this study complements two-color tunneling photoemission in strong fields, and has potential applications for nanowire-based photonic devices. Moreover, the demonstrated two-color multiphoton emission may be important for realizing ultrafast spin-polarized electron sources via optically injected spin current
Two-Color Multiphoton Emission from Nanotips
Two-color multiphoton emission from polycrystalline tungsten nanotips has been demonstrated using two-color laser fields. The two-color photoemission is assisted by a three-photon multicolor quantum channel, which leads to a twofold increase in quantum efficiency. Weak-field control of two- color multiphoton emission was achieved by changing the efficiency of the quantum channel with pulse delay. The result of this study complements two-color tunneling photoemission in strong fields, and has potential applications for nanowire-based photonic devices. Moreover, the demonstrated two-color multiphoton emission may be important for realizing ultrafast spin-polarized electron sources via optically injected spin current
Two-color multiphoton emission from nanotips
Two-color multiphoton emission from polycrystalline tungsten nanotips has been demonstrated using two-color laser fields. The two-color photoemission is assisted by a three-photon multicolor quantum channel, which leads to a twofold increase in quantum efficiency. Weak-field control of twocolor multiphoton emission was achieved by changing the efficiency of the quantum channel with pulse delay. The result of this study complements two-color tunneling photoemission in strong fields, and has potential applications for nanowire-based photonic devices. Moreover, the demonstrated two-color multiphoton emission may be important for realizing ultrafast spin-polarized electron sources via optically injected spin current
Internal representation and factional faultlines as antecedents for board performance in social enterprises
There is an increasing scholarly interest in how social enterprises manage their hybrid nature. As hybrid organizational forms, social enterprises combine mission-driven social goals and revenue generating activities in a variety of organizational constellations and in diverse institutional contexts. Acknowledging the potentially conflicting demands that institutional environments impose on social enterprises there is an increasing research interest in the existence and proliferation of these conflicting demands at the organizational level. Some researchers have pointed to the importance of particular management practices and governance characteristics – such as authority relations and internal representation – as mechanisms to deal with the conflicting demands at the organizational level. This paper adds to this stream of literature by taking into account the organizational level dynamics of internal representation and the proliferation of factional groups in the boards of directors of hybrid organizational forms and their impact on board performance, ultimately influencing
the organizational performance
Implementation of an Optimal First-Order Method for Strongly Convex Total Variation Regularization
We present a practical implementation of an optimal first-order method, due
to Nesterov, for large-scale total variation regularization in tomographic
reconstruction, image deblurring, etc. The algorithm applies to -strongly
convex objective functions with -Lipschitz continuous gradient. In the
framework of Nesterov both and are assumed known -- an assumption
that is seldom satisfied in practice. We propose to incorporate mechanisms to
estimate locally sufficient and during the iterations. The mechanisms
also allow for the application to non-strongly convex functions. We discuss the
iteration complexity of several first-order methods, including the proposed
algorithm, and we use a 3D tomography problem to compare the performance of
these methods. The results show that for ill-conditioned problems solved to
high accuracy, the proposed method significantly outperforms state-of-the-art
first-order methods, as also suggested by theoretical results.Comment: 23 pages, 4 figure
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