2,921 research outputs found
Identifying Collective Modes via Impurities in the Cuprate Superconductors
We show that the pinning of collective charge and spin modes by impurities in
the cuprate superconductors leads to qualitatively different fingerprints in
the local density of states (LDOS). In particular, in a pinned (static) spin
droplet, the creation of a resonant impurity state is suppressed, the
spin-resolved LDOS exhibits a characteristic spatial pattern, and the LDOS
undergoes significant changes with increasing magnetic field. Since all of
these fingerprints are absent in a charge droplet, impurities are a new probe
for identifying the nature and relative strength of collective modes.Comment: 4 pages, 4 figure
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Supply Chain Modifications to Improve Additive Manufacturing
Additive manufacturing (AM) offers unique production characteristics which among those,
toollessness and production of complex geometries are potentially significant to operations
efficiency. Previous research has illustrated the potential sufficiency of this technology to affect the
supply chains‟ arrangements and enabling decentralized production configurations. While, one of
the important advantages of AM enabled distributed production is the increased flexibility, which is
a necessity in today‟s competitive and ever changing global supply chains, number of obstacles
have kept this method from wide implementation. In this paper, we study the possible supply chain
modifications to decrease the cost of an AM-enabled decentralized production system. In other
words, we perform a cost-benefit analysis on various AM supply chain strategies in a spare parts
context to realize the independent operational factors affecting the implementation cost of additive
manufacturing. Moreover, we analyze the ways to adapt the supply chain management to enable full
potential of AM considering the present technology.Mechanical Engineerin
On the generalized linear equivalence of functions over finite fields
In this paper we introduce the concept of generalized linear equivalence between functions defined over finite fields; this can be seen as an extension of the classical criterion of linear equivalence, and it is obtained by means of a particular geometric representation of the functions. After giving the basic definitions, we prove that the known equivalence relations can be seen as particular cases of the proposed generalized relationship and that there exist functions that are generally linearly equivalent but are not such in the classical theory. We also prove that the distributions of values in the Difference Distribution Table (DDT) and in the Linear Approximation Table (LAT) are invariants of the new transformation; this gives us the possibility to find some Almost Perfect Nonlinear (APN) functions that are not linearly equivalent (in the classical sense) to power functions, and to treat them accordingly to the new formulation of the equivalence criterion
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