949 research outputs found
Does Modern Econometrics replicate the Phillips Curve?
This paper reexamines the existence of a long-run relationship between wages and unemployment in the U.K., with data over the period 1860-1913 used by A.W. Phillips to derive the well-known Phillips Curve. Using Johansen's maximum likelihood method of testing for cointegration, a long-run inverse relationship is indeed depicted between the rate of inflation and the unemployment rate. However, the main impact of deviations from this long-run equilibrium is on the unemployment rate rather than the rate of inflation.Phillips Curve; long-run equilibrium; cointegration
Production of oxygen from lunar ilmenite
The overall objective of this project was to develop a novel carbothermal reduction process for production of oxygen from lunar ilmenite. The specific objective was to use a reaction sequence in which a wide variety of carbonaceous compounds (including carbonaceous wastes) can be used as reducing agents. During the first phase, two reactor systems were designed, constructed, and operated to study the reaction fundamental important in this process. One system is a small fluidized bed, and the other is a thermo-gravimetric reactor system. Preliminary experiments on synthetic ilmenite are conducted to study the effect of carbon type, carbon loading, temperature, and gas flow rate. Results indicate that a reaction path based on carbon gasification can be used to promote the overall kinetics. A unique temperature and concentration-programmed reaction procedure was being developed for rapid parametric study of the process
Modeling and Simulation of Solar Photovoltaic Cell for the Generation of Electricity in UAE
This paper proposes the implementation of a circuit based simulation for a
Solar Photovoltaic (PV) cell in order to get the maximum power output. The
model is established based on the mathematical model of the PV module. As the
PV cell is used to determine the physical and electrical behavior of the cell
corresponding to environmental factors such as temperature and solar
irradiance, this paper evaluates thirty years solar irradiation data in United
Arab Emirates (UAE), also analyzes the performance parameters of PV cell for
several locations. Based on the Shockley diode equation, a solar PV module is
presented. However, to analyze the performance parameters, Solarex MSX 120, a
typical 120W module is selected. The mathematical model for the chosen module
is executed in Matlab. The consequence of this paper reflects the effects of
variation of solar irradiation on PV cell within UAE. Conclusively, this paper
determines the convenient places for implementing the large scale solar PV
modules within UAE.Comment: To be published in 5th International Conference on Advances in
Electrical Engineering (ICAEE-2019
A review on super dense coding over covariant noisy channels
We study the performance of the super dense coding protocol in the presence
of quantum channels with covariant noise. We first consider the bipartite case
and review in a unified way the case of general Pauli channels. We discuss both
the cases of unitary and non-unitary encoding. We also study the multipartite
scenario and investigate the case of many senders and one receiver.Comment: 11 pages, 8 figures. arXiv admin note: text overlap with
arXiv:1107.359
Optimal super dense coding over memory channels
We study the super dense coding capacity in the presence of quantum channels
with correlated noise. We investigate both the cases of unitary and non-unitary
encoding. Pauli channels for arbitrary dimensions are treated explicitly. The
super dense coding capacity for some special channels and resource states is
derived for unitary encoding. We also provide an example of a memory channel
where non-unitary encoding leads to an improvement in the super dense coding
capacity.Comment: 8 pages, 5 figure
Optimal super dense coding over noisy quantum channels
We investigate super dense coding in the presence of noise, i.e. the
subsystems of the entangled resource state have to pass a noisy unital quantum
channel between the sender and the receiver. We discuss explicitly the case of
Pauli channels in arbitrary dimension and derive the super dense coding
capacity (i.e. the optimal information transfer) for some given resource
states. We also study the case that the initial resource state can be chosen:
for the qubit depolarizing channel we show that there is a threshold value for
the noise parameter, below which the super dense coding protocol is optimized
by a maximally entangled initial state, while above the threshold the dense
coding capacity for any entangled initial state is smaller than the one for a
product state. Finally, we provide an example of a noisy channel where
non-unitary pre-processing increases the super dense coding capacity, as
compared to only unitary encoding.Comment: 22 pages, 5 figure
On the Reduction of the Driving Force in Shear-driven Flows
In shear-driven flows, an external driving force is needed to maintain the relative movement of horizontal plates. This thesis presents a systematic analysis on using spatially periodic heating and grooved surfaces to control this force. It is found that the use of periodic heating creates a buoyancy-driven effect that always reduces this force. The use of proper heating may even lead to the complete elimination of this force. It is further found that the use of isothermal grooved surfaces always enhances flow resistance, resulting in an increase of this force. When grooves and heating are applied together, their interaction induces a horizontal pressure force that can either increase or decrease the driving force, depending on the relative positions of the groove and heating patterns. Mechanisms leading to such changes of the driving force are discussed
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