9,178 research outputs found
The Role of Maintenance and Facility Management in Logistics: A Literature Review
Purpose - The purpose of this paper is to provide a literature review on the different ways of carrying out Facility Management and related topics in order to uncover that there is limited research regarding the impact of Facility Management on the logistics and operational performance of warehouses. Design/methodology/approach - Four different focus areas have been identified and for each one different methodologies and streams of research have been studied. Findings - The study underlines the importance of Facility Management for the logistics operations; therefore it supports the notion that investments aiming at preserving the status of the building and service components of warehouses are crucial. Originality/value - This paper aims to suggest to Facility Management managers that they can contribute to enhance business performance by designing effective Facility Management strategie
The Complete Non-Singlet Heavy Flavor Corrections to the Structure Functions , , and the Associated Sum Rules
We calculate analytically the flavor non-singlet massive
Wilson coefficients for the inclusive neutral current non-singlet structure
functions and and charged current
non-singlet structure functions , at
general virtualities in the deep-inelastic region. Numerical results are
presented. We illustrate the transition from low to large virtualities for
these observables, which may be contrasted to basic assumptions made in the
so-called variable flavor number scheme. We also derive the corresponding
results for the Adler sum rule, the unpolarized and polarized Bjorken sum rules
and the Gross-Llewellyn Smith sum rule. There are no logarithmic corrections at
large scales and the effects of the power corrections due to the heavy
quark mass are of the size of the known corrections in the case
of the sum rules. The complete charm and bottom corrections are compared to the
approach using asymptotic representations in the region . We
also study the target mass corrections to the above sum rules.Comment: 50 pages LATEX, 35 figure
Glueability of Resource Proof-Structures: Inverting the Taylor Expansion
A Multiplicative-Exponential Linear Logic (MELL) proof-structure can be expanded into a set of resource proof-structures: its Taylor expansion. We introduce a new criterion characterizing those sets of resource proof-structures that are part of the Taylor expansion of some MELL proof-structure, through a rewriting system acting both on resource and MELL proof-structures
Relational type-checking for MELL proof-structures. Part 1: Multiplicatives
Relational semantics for linear logic is a form of non-idempotent
intersection type system, from which several informations on the execution of a
proof-structure can be recovered. An element of the relational interpretation
of a proof-structure R with conclusion acts thus as a type (refining
) having R as an inhabitant. We are interested in the following
type-checking question: given a proof-structure R, a list of formulae ,
and a point x in the relational interpretation of , is x in the
interpretation of R? This question is decidable. We present here an algorithm
that decides it in time linear in the size of R, if R is a proof-structure in
the multiplicative fragment of linear logic. This algorithm can be extended to
larger fragments of multiplicative-exponential linear logic containing
-calculus
Transport Properties and Optical Conductivity of the adiabatic Su-Schrieffer-Heeger model: a showcase study for rubrene based field effect transistors
Transport properties, spectral function and optical conductivity of the
adiabatic one-dimensional Su-Schrieffer-Heeger (SSH) model are studied with
particular emphasis on the model parameters suitable for Rubrene single
crystals based field effect transistors. We show that the mobility, calculated
by using the Kubo formula for conductivity, vanishes unless we introduce an "ad
hoc" broadening of the system energy levels. Furthermore, the apparent
contradiction between angle resolved photoemission data and transport
properties is clarified by studying the behavior of the spectral function.
Finally, a peak in the optical conductivity at very low energy is obtained and
discussed in connection with the available experimental data for Rubrene based
devices
May a dissipative environment be beneficial for quantum annealing?
We discuss the quantum annealing of the fully-connected ferromagnetic -spin model in a dissipative environment at low temperature. This model, in
the large limit, encodes in its ground state the solution to the Grover's
problem of searching in unsorted databases. In the framework of the quantum
circuit model, a quantum algorithm is known for this task, providing a
quadratic speed-up with respect to its best classical counterpart. This
improvement is not recovered in adiabatic quantum computation for an isolated
quantum processor. We analyze the same problem in the presence of a
low-temperature reservoir, using a Markovian quantum master equation in
Lindblad form, and we show that a thermal enhancement is achieved in the
presence of a zero temperature environment moderately coupled to the quantum
annealer.Comment: 4 pages, 1 figure, proceeding of IQIS 201
Real time vibronic coupling dynamics in organic conjugated systems
In this work we show the potentialities of applying impulsive coherent vibrational spectroscopy to conjugated systems relevant for applications. We studied films of sexithiophene, a candidate for large area molecular electronics, poly-phenylene vinylene, a prototype electroluminescent material, and polydiacetylene, very promising for applications in photonic devices. These experiments demonstrate the possibility of studying coherent molecular dynamics in organic systems with extremely high time resolution
Spacecraft dynamics under the action of Y-dot magnetic control law
The paper investigates the dynamic behavior of a spacecraft when a single magnetic torque-rod is used for achieving a pure spin condition by means of the so-called Y-dot control law. Global asymptotic convergence to a pure spin condition is proven on analytical grounds when the dipole moment is proportional to the rate of variation of the component of the magnetic field along the desired spin axis. Convergence of the spin axis towards the orbit normal is then explained by estimating the average magnetic control torque over one orbit. The validity of the analytical results, based on some simplifying assumptions and approximations, is finally investigated by means of numerical simulation for a fully non-linear attitude dynamic model, featuring a tilted dipole model for Earth׳s magnetic field. The analysis aims to support, in the framework of a sound mathematical basis, the development of effective control laws in realistic mission scenarios. Results are presented and discussed for relevant test cases
A Framework to Use Public-Private Partnership for Smart City Projects
The concept of Smart City has been emerging as a strategic set of integrated initiatives encompassing infrastructures, technology and digital services for the purpose of enhancing the quality of life of citizens. However, the development and implementation of Smart City projects require considerable investments that are difficult to fund with traditional public finance. In this context, Public-Private-Partnerships (PPP) appear to be suitable solutions to overcome the shortage of public finance and cuts on public spending. However, the adoption of PPP forms for Smart City projects has not been fully explored and only experimentally applied so far. In order to promote the usage of PPP to finance Smart City initiatives, this paper proposes some PPP financial instruments and discusses the associated strengths and weaknesses. In particular, the use of Project Finance, Revenue Sharing and Social Impact Bonds are suggested as sound alternatives and suitable sources of financing for Smart City project
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