3,229 research outputs found
Fundamental Principles and Rights At Work: Value, Viability, Incidence and Importance as Elements For Economic Progress and Social Justice
Working Paper prepared for the ILO by Maria Luz Vega Ruiz and Daniel Martinez, focusing on the rights at work in Latin America and the Caribbean
Fuzzy Inference System for VOLT/VAR control in distribution substations in isolated power systems
This paper presents a fuzzy inference system for voltage/reactive power
control in distribution substations. The purpose is go forward to automation
distribution and its implementation in isolated power systems where control
capabilities are limited and it is common using the same applications as in
continental power systems. This means that lot of functionalities do not apply
and computational burden generates high response times. A fuzzy controller,
with logic guidelines embedded based upon heuristic rules resulting from
operators at dispatch control center past experience, has been designed.
Working as an on-line tool, it has been tested under real conditions and it has
managed the operation during a whole day in a distribution substation. Within
the limits of control capabilities of the system, the controller maintained
successfully an acceptable voltage profile, power factor values over 0,98 and
it has ostensibly improved the performance given by an optimal power flow based
automation system
Case studies and digital response systems in science courses for master students: Are we encouraging valuable discussions?
Exploring distance learning experiences of in-service music teachers from Puerto Rico in a master's program
Thesis (D.M.A.)--Boston UniversityThe purpose of this study was to explore the experiences of in-service music teachers who chose to pursue a master's degree in music education through distance learning. In this study, I examined the motivations of in-service music teachers for choosing to pursue a master's degree in music education through distance learning; the benefits teachers reported as a result of emolling in a distance learning program; the challenges teachers faced when studying in an online distance learning graduate program; and, the learning experiences teachers found significant for their profession and teaching environments. Teachers who pursued a master's degree in music education through distance learning at Cambridge College Puerto Rico Regional Center comprised the sample. The primary data collection method was individual semi-structured interviews.
Results depicted that the experiences gained by in-service music teachers increased their capacity in teaching pedagogy, theoretical understanding of the field, communication skills, and capability in handling technological issues. The difference between the number of students satisfied and dissatisfied with the program was significant, with the former outnumbering the latter. The salient disadvantages reported by the sample group included a technological gap, reduced direct interaction with professors, a need for self-motivation, and a reduced practical ability between the moderators and the students. On the other hand, the primary advantage of distance learning was the convenience and flexibility of pursuing a music education degree online, which allowed the in-service music teachers to study at home and gave them the capability to balance their domestic and professional responsibilities. The participants' main reasons for enrolling in an online degree program were a desire to excel in their careers, the lack of a geographically closer option, professional and/or family lifestyles, a need for increasing academic knowledge, and a need to improve teaching capability and capacity. Recommendations are offered for leaders and institutions engaged in distance learning programs to address the challenges raised by students who have gone through the system. I hope that the knowledge gained from this study will expand both scholars' and prospective students' current understanding of distance learning as an educational model, especially in the music education field
Optimal Staged Self-Assembly of General Shapes
We analyze the number of tile types , bins , and stages necessary to
assemble squares and scaled shapes in the staged tile assembly
model. For squares, we prove stages suffice and
are necessary for almost all .
For shapes with Kolmogorov complexity , we prove
stages suffice and are necessary to
assemble a scaled version of , for almost all . We obtain similarly tight
bounds when the more powerful flexible glues are permitted.Comment: Abstract version appeared in ESA 201
Stochastic theory of lineshape broadening in quasielastic He atom scattering with interacting adsorbates
The activated surface diffusion of interacting adsorbates is described in
terms of the so-called interacting single adsorbate approximation, which is
applied to the diffusion of Na atoms on Cu(001) for coverages up to 20% in
quasielastic He atom scattering experiments. This approximation essentially
consists of solving the standard Langevin equation with two noise sources and
frictions: a Gaussian white noise accounting for the friction with the
substrate, and a white shot noise characterized by a collisional friction
simulating the adsorbate-adsorbate collisions. The broadenings undergone by the
quasielastic peak are found to be in very good agreement with the experimental
data reported at two surface temperatures 200 and 300 K.Comment: 6 pages, 3 figure
The property RNT on dendroids
A continuum is said to be retractable onto near trees (abbreviating RNT) provided that for each > 0 there exists > 0 such that if T is a tree in X and H(T,X) < , then there exists an -retraction r of X onto T. In this paper it is proved that an arcwise connected continuum with the property RNT is a dendroid. We focus our study on dendroids. Dendrites are characterized as: (a) smooth dendroids with property RNT, (b) dendroids with the property RNT hereditarily. Finally, an example of a nonlocally connected dendroid with property RNT is shown
Fuzzy inference system for integrated VVC in isolated power systems
This paper presents a fuzzy inference system for integrated volt/var control
(VVC) in distribution substations. The purpose is go forward to automation
distribution applying conservation voltage reduction (CVR) in isolated power
systems where control capabilities are limited. A fuzzy controller has been
designed. Working as an on-line tool, it has been tested under real conditions
and it has managed the operation during a whole day in a distribution
substation. Within the limits of control capabilities of the system, the
controller maintained successfully an acceptable voltage profile, power factor
values over 0,98 and it has ostensibly improved the performance given by an
optimal power flow based automation system. CVR savings during the test are
evaluated and the aim to integrate it in the VVC is presented.Comment: arXiv admin note: substantial text overlap with arXiv:1401.163
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