bluuebunny/crossref_metadata_2025 huggingface dataset:
Pollen effect (xenia) for evaluating breeding materials in maize
Authors: Kahriman Fatih , Şerment Mehmet , Haşlak Mizgin , Kang Manjit
Published: July 2017

Pollen effect (xenia) plays an important role in modifying biochemical
constituents of maize (Zea mays L.) kernels. The objectives of this study
were to i) evaluate the effect of filial generations on certain genetic
estimations; ii) compare general (GCA) and specific combining ability (SCA)
effects obtained from Griffing?s diallel analyses between parental (F0) and
F1 generations; iii) determine the relationships between pollen effect and
genetic estimations; and iv) examine the possible utility of pollen effect
for improving kernel-quality traits (protein and oil contents). We conducted
two experiments (F0 in 2011 and F1 in 2013) and examined kernel protein and
oil contents. Individual pollen effects (IPE) and specific individual pollen
effects (SIPE) were computed. The results showed that entries (E) and filial
generations (G) and E ? G interaction variances were significant for both
protein and oil contents, whereas changes in genetic estimates between
generations were highly variable. The signs and magnitudes of GCA effects
were similar and highly correlated (r > 0.80) between F0 and F1 generations
for all four diallel methods. In addition, GCA effects were highly correlated
with IPE estimates for all four diallel methods. Specific combining ability
(SCA) estimates between F0 and F1 generations were moderately correlated (r =
0.50) in Method IV for oil and highly negatively correlated (r = -1.00) in
Method III for protein content. Heterosis analyses showed that hybrids could
not be evaluated on the basis of the F0 generation to predict their F1
performances. Individual pollen effects between generations showed higher
correlation for protein content (r = 1.00) than for oil content (r = 0.40).
Specific individual pollen effects of parents were also slightly higher for
protein content (r = 0.74) than for oil content (r = 0.62). We concluded that
the direct or indirect utilization of pollen effect (xenia) was possible for
parental evaluation but not suitable for hybrid evaluation for kernel oil and
protein contents.
Morpho-physiological characterization of soybean genotypes under subtropical environment
Authors: Al-Hadi Gaffar , Islam Rafiqul , Karim Abdul , Islam Tofazzal
Published: July 2017

Soybean is a promising oilseed crop in rice-based cropping systems in South
and Southeast Asia. In spite of immense scope of its expansion, the crop is
not being popular to the farmers because of poor yield of the existing
cultivars. Therefore, this study evaluated eighty-soybean genotypes of
diverse growth habits with a view to searching genotype(s) of desirable
morpho-physiological characters and high yield potential. Sixteen
quantitative plant traits were evaluated to classify the genotypes into
different groups using various multivariate methods. A wide range of
variation was found in almost all qualitative plant traits. The study reveals
that plants tend to become taller as the phenological cycle is longer. Seed
yield was the product of the number of pods per plant, pod weight and seeds
per pod. The first three components of principal component analysis explained
75% of the total variations of the soybean genotypes. Using Dendrogram from
cluster analysis, the genotypes were grouped into six clusters. The maximum
number of genotypes was concentrated in cluster 5 followed by clusters 4. The
phenology, plant height, the number of pods and seed yield were the important
discriminating variables in grouping the genotypes. The number of pods per
plant displayed the principal role in explaining the maximum variance in the
genotypes. The clustering pattern of the genotypes revealed that the
genotypes under cluster 2 and cluster 6 were long statures, late maturing and
produced higher seed yield. The genotype G00003 under cluster 2 is the best
entry giving the highest seed yield. From cluster 6, the genotype G00209
could be the better choice for much better seed yield. The cluster 3
genotypes were comparatively early maturing and gave reasonable yield. It is
concluded that the genotypes under clusters 2 and 6 and 3 can be important
resources for developing a high yielding variety and sustainability of
growing soybean in the subtropical conditions.
Genotypic variations for photoassimilates partitioning to the grains during early development of endosperm in wheat: Association with grain weight
Authors: Joudi Mehdi
Published: July 2017

There is little information on genotype variations for photoassimilates
partitioning to the grains during early development of endosperm in wheat.
Eighty-one wheat cultivars were examined in the Moghan region of Iran during
2010-2011 and 2013-2014 growing seasons. The amount and rate of
photoassimilates partitioning to the grains were measured in the tested
cultivars during anthesis-16 days after anthesis (DAA) and 16 DAA-maturity
phases using time dependent changes in spike dry weight. There were
substantial genetic variations in the amount and rate of partitioned
photoassimilates to the grains during anthesis-16 DAA and 16 DAA-maturity
phases. Part of these variations could be attributed to cultivars differences
in anthesis time, spike dry weight at anthesis, and grain number per spike.
Taking them into accounts, there were some cultivars but they differed in
partitioned photoassimilates toward grains during anthesis-16 DAA and 16
DAA-maturity phases, further supporting the idea that breeding for
photoassimilates partitioning during these phases was a possibility. The
results yielded for 2013-2014 showed that there is close association between
photoassimilates partitioning to the grain during anthesis-16 DAA and
individual grain weight. The results suggest that in case wheat breeders
could improve photoassimilates partitioning to the grains during anthesis-16
DAA, it would result in increased grain size and weight in the wheat.
Characterisation of B killer cell immunoglobulin-like receptor genes and telomeric and centromeric motifs in hematopoietic stem cell transplantation donors in Vojvodina, Serbia
Authors: Ademovic-Sazdanic Dusica , Vojvodic Svetlana , Popovic S. , Konstantinidis N.
Published: July 2017

The outcome of HSCT is strongly in?uenced by the genetic similarity or
identity in the HLA genes that affects the incidence of graft-versus-host
disease (GvHD). Successful allogeneic HSCT, however, depends also on T-cell
mediated graft-versus-leukemia (GvL) effect, in which donor-derived T cells
and natural killer (NK) cells kill these malignant cells in the patient,
therefore playing a crucial role in relapse prevention. The aim of this study
was to make the predictive analysis of the structure and distribution of B
KIR alleles and centromeric and telomeric KIR genotypes in HSCT donors in
Vojvodina with regard to their contribution to protection from relapse. A
total of 124 first-degree relatives of patients with hematological
malignancies were examined for the presence or absence of 15 KIR genes by
using of PCR-SSO technique with Luminex xMap technology. The percentage of
individuals carrying each KIR gene, centromeric and telomeric KIR haplotypes
and genotypes was determined by direct counting. Sixty two percent of the
HSCT donors in Vojvodina carry A KIR haplotype, while nearly 38% carry B KIR
haplotype. The distribution of B KIR genes showed that among 124 studied HSCT
donors, 31(25%) do not carry none of the KIR genes belonging to B group,
71.77% of donors have two or more B KIR genes, 61.29% of them carry KIR 2DL2
and 2DS2 or more B KIR genes. The analysis of centromeric and telomeric KIR
genotypes, showed that Cen-A1/Tel-A1 genotype had a highest frequency of
51.47% and Cen-B2/Tel-B1 the lowest frequency of 1.30%. The usage of donor
KIR B gene content and centromeric and telomeric KIR gene structure could be
used in development of a simple algorithm to identify donors who will provide
the most protection against the relapse in related HSC transplants.
A multivariate approach to the selection of pea (Pisum sativum L.) lines obtained by the single seed descent technique
Authors: Surma Maria , Adamski Tadeusz , Kaczmarek Zygmunt , Święcicki Wojciech , Mejza Stanisław , Barzyk Paweł , Kuczyńska Anetta , Krystkowiak Karolina , Mikołajaczak Krzysztof , Ogrodowicz Piotr
Published: July 2017

Grain legumes, especially pea and lupine, are important agricultural crops in
Central and Northern Europe. Because of the high level of protein in their
seeds, these species constitute an alternative to soya meal imported from
South America. The breeding of new cultivars in a short time is a major
problem in pea breeding, particularly since the production of homozygous
lines in the DH (doubled haploid) system, as used for cereals, for example,
is very difficult. An alternative approach may be the single seed descent
(SSD) method. The materials for this study were lines of pea obtained by
that method combined with in vitro culture of embryos. This approach enabled
9 generations to be obtained in 2.5 years. First, SSD lines (F10) were
investigated in a field experiment conducted in a complete randomized design
with two replications, in which the dates of flowering and ripening and seed
yield per plant were observed. Seventy seven lines out of 120 (64%) were
selected for a subsequent experiment in which F4 generations of each cross
combination were also included. In the second field experiment SSD lines
were evaluated for earliness, plant height, seed yield per plot, and
1000-seed weight. The data were processed by multivariate analysis of
variance and related methods, leading to the selection of 16 lines for
further breeding experiments. Multivariate analysis can be helpful for
breeders in seeking plants with a new favorable complex of yield-forming
traits.

 This article has been corrected. Link to the correction 10.2298/GENSR1703127E
Do Investors Fully Unravel Persistent Pessimism in Analysts' Earnings Forecasts?
Authors: Veenman David , Verwijmeren Patrick
Published: July 2017

This study presents evidence suggesting that investors do not fully unravel predictable pessimism in sell-side analysts' earnings forecasts. We show that measures of prior consensus and individual analyst forecast pessimism are predictive of both the sign of firms' earnings surprises and the stock returns around earnings announcements. That is, we find that firms with a relatively high probability of forecast pessimism experience significantly higher announcement returns than those with a low probability. Importantly, we show that these findings are driven by predictable pessimism in analysts' short-term forecasts, as opposed to optimism in their longer-term forecasts. We further find that this mispricing is related to the difficulty investors have in identifying differences in expected forecast pessimism. Overall, we conclude that market prices do not fully reflect the conditional probability that a firm meets or beats earnings expectations as a result of analysts' pessimistically biased short-term forecasts.

JEL Classifications: G12; G14; G20.
Can Twitter Help Predict Firm-Level Earnings and Stock Returns?
Authors: Bartov Eli , Faurel Lucile , Mohanram Partha S.
Published: July 2017

Prior research has examined how companies exploit Twitter in communicating with investors, and whether Twitter activity predicts the stock market as a whole. We test whether opinions of individuals tweeted just prior to a firm's earnings announcement predict its earnings and announcement returns. Using a broad sample from 2009 to 2012, we find that the aggregate opinion from individual tweets successfully predicts a firm's forthcoming quarterly earnings and announcement returns. These results hold for tweets that convey original information, as well as tweets that disseminate existing information, and are stronger for tweets providing information directly related to firm fundamentals and stock trading. Importantly, our results hold even after controlling for concurrent information or opinion from traditional media sources, and are stronger for firms in weaker information environments. Our findings highlight the importance of considering the aggregate opinion from individual tweets when assessing a stock's future prospects and value.
An Adaptative Control for Wind Turbine.
Authors: André Martinez  , Fabien Lescher  , Jing Yun Zhao
Published: July 2017

In   this   paper,   an   adaptive   control   is   proposed   to   maximize   the   energy   conversion   for   a   wind   turbine   driven  by  a  PWM  (Pulse  Width  Modulation)  Inverter.  This  paper  focuses  on  the  optimization  of  the  current  loops  of  the  machine.  Two  different  strategies  of  wind  turbine  management  have  been  tested  in  steady  and  transient   state   (with   the   variation   of   the   load).   The   principle of the optimization consists of minimizing Joule losses   in   PWM   and   Generator.   The   second   strategy   (adaptive) is implemented with successful results.
Generation and store of aeolian energy in form of Hydrogen using multipole aeolian generators
Authors: SAN MARTÍN, José Javier  , DavidROMERO, David  , EduardoROMERO, Eduardo  , ZUAZUA, Jon  , APERRIBAY, Víctor  , SAN MARTÍN, José Ignacio  , SAN MARTÍN, José Ignacio  , MARTÍN, Iñaki
Published: July 2017

The objective of the communication is to show the possibilities for an aeolian generator when (it is) generating energy. One option is (will be) injecting the energy directly to the network and the other one is to produce hydrogen to store the energy. After that this hydrogen will be used in fuel batteries to produce electricity.
The obtained hydrogen from conventional energies has a high ecological cost by the polluting gases discharge to the atmosphere. These gases produce serious damages in our surroundings, as the greenhouse effect and acid rain are examples of this.
The hydrogen is considered a clean energy, when non-polluting energies are used to produce it. For example the renewable energies. In this case it is denominated green hydrogen. An option with promising future seems to be the production of hydrogen, with the energy generated in photovoltaic panels and aeolian generators.
Neural Network Estimation of Generator Slot Fields for the Calculation of Radial Field Losses and Circulating Currents.
Authors: E. Schlemmer  , B. Streibl  , F. Müller
Published: July 2017

In this paper, an approximate method for the fast calculation of magnetic fields inside the stator slots of large hydro generators is presented. Due to its relatively low computational cost, the approach is suitable for every-day-use calculations in the process of tendering and design of hydro generators. The scheme comprises two parts. The first one is a Boundary Element Method (BEM) solution of a slot with current-carrying strands and ideally permeable walls. The second part consists in an Artificial Neural Network (ANN) for the incorporation of secondary effects, such as tooth saturation. The effects of induced eddy currents on the flux density at the strands’ centres are taken into account by an iterative BEM solution with successive corrections of the resulting fields. Since eddy current effects are comparably small for the configurations usually applied, convergence is readily achieved. The training data for the ANN were obtained from a comparison between the linear BEM results and Finite Element (FE) computations which have been carried out on a set of 65 hydro generators at different slot temperatures. By employing the BEM approach, which captures most of the underlying physics, and a corrective neural network, a grey box model is obtained. This has the advantage that the output of the net is “safeguarded” by the BEM solution. In order to get a robust representation of the data, the training of the ANN was carried out applying a Genetic Algorithm (GA).
Review of the islanding phenomenon problem for connection of renewable energy systems.
Authors: Hèctor Beltran  , Francisco Gimeno  , Salvador Seguí-Chilet  , Jose M. Torrelo
Published: July 2017

As distributed generators increase their importance on the electric power system, more and more parameters have to be controlled in order to assure the proper operation of the utility. One of the main problems encountered with this kind of generation is the potential formation of islands which could keep working in a normal way even if the utility grid has failed. Many methods have been developed to prevent this situation and they have been classified into three groups: passive, active and methods based on communication systems. This paper checks the validity of some of the active and passive anti-islanding methods. Some of them are shown to work properly with any kind of utility and local loads in the potential island. On the other hand, some others would not disconnect the power generator when the total power of the local load fits that of the generator
Variable speed turbine based wind farm including storage system connected to a power grid or islanded.
Authors: A. Davigny  , B. Robyns
Published: July 2017

In this paper, the possibility of a generating system, which associates a variable speed wind turbine and a flywheel energy storage system, to participate to the ancillary services is investigated. The connection to a power grid of a farm including three of them is considered. A solution is proposed to allow wind generators to work as voltage sources with the help of a frequency droop. It is shown that the power generated by these systems can be controlled by fixing the power set point when they are connected to the grid, and that, in case of islanding, they can share the global load of the isolated network
Low-cost orientation system for a concentrating solar collector with static reflector and tracking receiver
Authors: V. Martínez-Moll  , B. Alorda  , A. Moia  , R. Pujol
Published: July 2017

A solar linear concentrator with a fixed reflector and a moving focus is under development. The main objective of the research is to develop a low – cost, roof integrated, solar collector suited for mid – range thermal applications, such as absorption cooling and industrial heat (90 – 200 ºC). This range of temperatures could be achieved with low concentration factors (9 - 15 suns). This range of radiation concentration is also well suited for the development of Combined Solar Heat and Power (CHP) systems integrating PV and thermal converters in the same unit [1]. Recently, this kind of application has gained much attention from the solar energy industry with several interesting development projects from both the industry and the academy [2]. The proposed solution is based on a static reflector with a moving linear focus (Figure 1). The basic geometric concepts were developed in the ‘70s [3] but the product development never passed beyond the experimental prototype stage. Nevertheless, a detailed ray-tracing modelling of the reflector behaviour shows clearly that it is possible to achieve a high optical efficiency into the target concentration range. Although the reflector is static, the sun path should be tracked by the receiver to be kept on the reflector focus. Therefore a precise and inexpensive tracking control system is of fundamental importance for a successful development of the collector
Evaluation of the renewable energy application in Mediterranean hotels: Case study the Balearic Islansd` hotels.
Authors: A. Moiá-Pol  , Michalis Karagiorgas  , V. Martínez-Moll  , R. Pujol  , Carles Riba-Romeva
Published: July 2017

The strategic changes in the energy management are usually increased after petrol crisis or policy changes. The Kyoto protocol and the increase of fossil fuel price make necessary a deep change in the design and the management of the energy facilities. Spain in general is living now these big changes, and there is an upsurge of installation of renewable energy sources. Hotels are high energy consumers in the tertiary building sector. Improved service quality forces hotel building facilities and installations to be maintained to the highest standards, thus renovations are becoming common to remain competitive. This offers great opportunities for promoting renewable energy sources (RES) and rational use of energy (RUE) in the hotel sector. The Balearic Islands have been one of the first tourist destinations; there are about half a million beds available. There is a rise in the number of hotels that, while improving the energy facilities, can supply a part of the energy consumption by RES, without change the comfort.
Power quality improvement of wind turbines using doubly-fed induction machines.
Authors: C. Saniter  , R. Grune  , A. Wood  , R. Hanitsch
Published: July 2017

A novel approach to modelling doubly-fed induction machines facing (distorted) ac power networks is presented. It takes place in the frequency-domain and is based on frequency coupling matrices using tensor algebra. Benefits of this comprehensible and fast modelling approach are demonstrated by establishing a feed-forward control signal that reduces stator current harmonics and torque ripple thereby improving the network compatibility and reducing the stress on the mechanical drive train. Dynamic simulations using PSCAD/EMTDC and MATLAB/Simulink are presented demonstrating the effectiveness of the proposed modelling approach and the feed-forward compensation scheme.
Effect of using external vertical fins in phase change material modules for domestic hot water tanks.
Authors: Albert Castell  , Cristian Solé  , Marc Medrano  , Joan Roca  , Daniel García  , Luisa F. Cabeza
Published: July 2017

The effect of using external vertical fins in Phase Change Materials (PCM) modules to improve the natural convection coefficient in water is studied in this paper.
The use of PCM in a water tank working with a solar system is able to store a lot of energy, but it is necessary to transfer this energy to the water during demand.
Optimization of the natural convection to the water is of great importance for the heat transfer. External fins increase the heat transfer surface and the heat transfer coefficient changes.
Experimental work was carried out to determine natural convection heat transfer coefficients for PCM modules with two different external vertical fin geometries. Results were presented as a temperature variation over time of the PCM and the water, and the heat transfer coefficient as a function of the temperature difference for different fins.
These results were used to validate a simulation code to determine the behaviour of the system using finned PCM modules. The results prove the technical potential of external fins for heat storage systems using PCM.
The experimental results were used to determine different correlations for Nusselt number as a function of different dimensionless numbers.
Effect on power quality of the high power electric traction (Double domain computer simulation vs. site measurements).
Authors: Dr. András Dán  , Péter Kiss
Published: July 2017

The paper shows the present results of a long term research work. The authors are working on the modelling of penetration of harmonics caused by the railways.
In a former paper [1] a detailed model of the traction system was discussed in frequency domain. However this paper presents the combination of frequency and time dependent model. This novel method, called double domain method is used to improve the accuracy of the frequency domain simulation. To calculate the sophisticated model of the electric locomotive as a non-linear load a time dependent model must be used. The traction supply system together with the equivalent supply network impedance could be calculated in frequency domain. An iteration algorithm is developed to converting the variables in every iteration step between the time and frequency domain.
DSP filter design for flexible alternating current transmission systems.
Authors: O. Abarrategui Ranero  , M.Gómez Perez  , D.M. Larruskain Eskobal
Published: July 2017

The paper analyses the design principles of both filtering techniques, FIR and IIR and will also overview the possibilities of the multirate and adaptive filters. The paper describes its features and makes a comparative analyse of them. It will also include some interesting algorithms with the implementations of some of these filters, generically and also in the machine language of one of the most important DSP producers of the time; Analog Devices.
Competition at an energy open market in the EU and its consecuences on the renewable energy segment.
Authors: O. Abarrategui Ranero  , D.M. Larruskain Eskobal  , M.Gómez Perez
Published: July 2017

The paper analyses the state of the different power generation segments of the European market , and the grade of protection offered by the different European governments to the ‘national champion’. The full paper will overview the subsidies ever received by the conventional power and compare them to the ones received by the renewables. We will try to propose different ways of enforcing the consume of renewable energy through a fairer market with real competence conditions and protection of the new technologies.
Using ultracapacitors in photovoltaic systems. A technical proposal.
Authors: José Antonio Domínguez Vázquez  , Fernando Martínez Rodrigo  , José Miguel Ruiz  , Santiago Lorenzo  Matilla
Published: July 2017

none
Comparison of energy potential of the eucalyptus globulus and the eucalyptus nitens.
Authors: S. Pérez  , C. J. Renedo  , A. Ortiz  , M. Mañana  , D. Silió  , J Peredo
Published: July 2017

In this work a power characterization of adult stages of the species Eucalyptus globulus and Eucalyptus nitens has been made. The study has been made in six different plantations in Cantabria (North coast of Spain), located at a latitude 43º28'N, and a longitude 3º48'W. The region has approximately 30,000 Ha dedicated to the growth of Eucalyptus. After the collection of samples they were weighed, analyzed and burned, resulting a mean net calorific value of 17,384 kJ/kg and 17,927 kJ/kg for the E. globulus and E. nitens, respectively. Finally, the economic and environmental consequences that the crop of these species would suppose for the region of Cantabria were analyzed.
Short-term prediction of the power generation of wind turbines.
Authors: Á. Székely  , T. Barbarics
Published: July 2017

Since the erection of the first wind turbine in Hungary in 2001, the proportion of power generated from wind has increased considerably, furthermore an even faster growth is expected in the next years. However, the more widespread use of wind energy plays a role in the fact that deviations from the international exchange schedule are becoming more frequent.
In this paper we summarize the present situation concerning the usage of wind power in Hungary, detail the results and the limitations of our investigations carried out on the public data of the meteorological forecasts that are the primary sources of power generation schedules of wind power plants and suggest possible improvements on the reliability of the schedules based on the forecasts.
Power transmission capacity upgrade for overhead lines.
Authors: D.M. Larruskain Eskobal  , I. Zamora  , O. Abarrategui  , A. Iraolagoitia  , M.D. Gutiérrez  , E. Loroño  , F. de la Bodega
Published: July 2017

Electric power consumption, has been increasing uninterruptedly, being this increase specially accelerated in the last years. New power generators are been built, the installed power increases each year, thus it is necessary a way to transmit the bulk energy. Nowadays electric lines are saturated, they are reaching critical values of ampacity and sag. Therefore building new lines is necessary to provide the ever increasing consumption. The difficulty to find corridors to construct new overhead lines is increasing in industrialised countries and in many cases it is simply impossible. It is not easy to obtain the rights of way for new transmission lines. The construction of new overhead electric lines is increasing difficulty, thus there is a need to look at alternatives that increases the power transfer capacity of the existing right of ways. This circumstance is forcing the use of the existing lines, which represents a cheaper solution than making an underground transmission.
Comparison of the effect of output filters on the total harmonic distortion of line current in voltage source line converter - simulation study.
Authors: Pasi Peltoniemi  , Riku Pöllänen  , Markku Niemelä  , Juha Pyrhönen
Published: July 2017

Two different output filter topologies are considered, namely the LCL- and L+LC-filter. The space vector modulation (SVM) is used to control the power switches of the converter. Design methods for both filter types are proposed. The methods are used to dimension the filter components. The performances of the filters designed are verified by simulations to meet the given line current total harmonic distortion (THD) requirement. The study reveals that the LCL-filter is more effective a filter topology in attenuating line current harmonic components than the L+LC-filter.
Gas based steady state analysis of parallel-operated three phase self-excited induction generators
Authors: A.I. Alolah  , M.A. Alkanhal
Published: July 2017

This paper proposes a scheme for a steady state analysis for a group of three phase self-excited induction generators operating in parallel. The proposed scheme to solve for the unknowns is a sequential numerical optimizer. This optimizer consists of two parts based on genetic algorithm (GA) is used to bring the values of the unknowns close to the region of the (optimality) solution Unlike the other reported methods of analysis, the same equation is to be solved irrespective of the unknown parameters. The analysis presented is validated by experimental results of two generators connected in parallel.
Development of a low-harmonic vector hysteresis current controller
Authors: J.F.Sanz  , J. Sallán  , M. Alonso  , M. Sanz  , J. L. Villa
Published: July 2017

The increasing interest in the use of renewable energy sources for the generation of electrical energy makes it necessary to ensure that these type of installations do not jeopardize the global operation of the electrical system to which they are connected. Up until now, this safety has been achieved by imposing very strict limits to the percentage of “non-controllable” renewable energy that can be connected to the grid. In order to increase these limits, new control schemes must be developed, focusing in power quality and, if possible, in trying to help grid stability. The paper proposes two new control methods for the current injected by a variable-speed generation system and compares them to a traditional hysteresis control. The first one obtains a table by using an algorithm that calculates the switching state that minimises switching frequency. The commutation is determined by a single comparator applied to the error vector, achieving a circular error area. The use of this table, along with the selection of a circular error area for the current vector makes that the current error remains always inside the specified error area. The second method is a predictive one, based on the previous one, that decides the optimum switching vector in the precise time when the commutation occurs, taking into account the present state of the system.
Analysis by finite element method of the crosstalk errors associated to the geometrical parameters for current transducers.
Authors: Arcega F.J.  , Artal J.S.  , Letosa J  , Usón A.
Published: July 2017

none
Proyect and current energy situation in the Basque Country
Authors: E. Zulueta  , M.D. Gutiérrez  , I. Manero
Published: July 2017

Due to the importance that energy occupies within society as a driver for competitiveness in industry, richness generation, and improvement of the technological development Ibrough new investments, the EU and its different Member States have created a legal ftamework aimed at controIling and reducing energy intensity, reducing the dependency from external countries and facilitating the introduction of indigenous energies for enhancing fmal energy supply. The Autonomous Region of the Basque Country is characterised for its enormous dependence on outsíde energy sources for the supply of a demand with high industrial penetration. Due to this, strategic energy plans have been developed since the 80's. These programmes try to guarantee energy supply in the best conditions of security, quality, economic cost and environmental impacto Several factors have been taken inlo account within these plans, as, for example:Social concems about environment conservation and social welfare,Studies of energy efficiency and savings,The contribution of renewable energies,The contribution of new combined ciele gas fired plants and also combined heat and power (CHP)
3D unsteady flow simulation in an OWC wave converter plant
Authors: A. EL MARJANI  , F. CASTRO  , M. BAHAJI  , B. FILALI
Published: July 2017

This paper deals with a numerical simulation to predict the air flow behaviour inside the chamber of an OWC wave converter plant by use of FLUENT code. The flow is assumed to be compressible, viscous and unsteady. Calculations have been conducted by considering a typical geometry (PICO plant) with an oscillating water free surface. In our analyses, we have only considered the case of monochromatic sinusoidal excitations with various frequencies and fixed amplitude. Analyses are focused on the flow behaviour characteristics both in the chamber and in the duct in order to obtain the temporal variation of velocity, pressure, flow rate and pneumatic power fields. Also, the mean characteristics like RMS ones of these parameters are determined. A great attention is paid to show the process of energy generation inside the chamber which can be exploited by a rotating turbine. In our case, we have included in the model a linear law relating the pressure drop to the mass flow rate in order to take into account the presence of the turbine. This is achieved in FLUENT by considering a domain of porous media in the turbine location. Simulation results obtained for all frequencies show that this code is very powerful and suitable for flow prediction in such geometries. Also, the amount of energy and also the aerodynamic losses between the chamber and the duct are well calculated.
A three-phase grid-connected inverter for photovoltaic applications using fuzzy MPPT.
Authors: Jaime Alonso-Martínez  , Santiago Arnaltes
Published: July 2017

This paper presents a three-phase grid-connected inverter designed for a 100kW photovoltaic power plant that features a maximum power point tracking (MPPT) scheme based on fuzzy logic. The whole system presented is simulated in Matlab. This fuzzy MPPT shows accurate and fast response, and is integrated in the inverter, so that a DC-DC converter is not needed. The inverter allows full control of reactive power.
Torque fluctuation and critical clearing time in wind power generation by induction machines.
Authors: Luigi Piegari  , Renato Rizzo  , Debora Coll-Mayor
Published: July 2017

Squirrel cage induction machines represent a common solution widely adopted in wind generation. The induction machine is simple, reliable, cheap and requires very little maintenance. Some problems are, however, connected with the use of induction machines in wind power generation systems. In particular two effects have to be taken into account: the torque fluctuations at the generator shaft and the critical clearing time (CCT). Both problems represent a serious limitation for weak networks in which the first effect can cause flicker effect while the CCT is very short. In the paper a full modelling of a wind energy plant constituted by n machines is presented. Using the set-up model the behaviour of the plant for a different number of connected machines is analysed. In particular, the system stability connected with voltage sags and network faults is studied
Frontier methodology to fix quality goals in electrical energy distribution companies.
Authors: R. Ramirez  , A. Sudrià  , A. Sumper  , J.Bergas  , R.Villafáfila
Published: July 2017

It is necessary to have tools that allow the regulator, or the distributor, to fix the goals of quality according to the electrical system of the area, taking care about the special characteristics that every distribution company has in front of the others. The methodology that this article presents allows having a simple tool to make this comparison and to fix the goals of quality in a possible horizon
A future micro-grid implementation based on renewable distributed resources for a clean green energy production.
Authors: F. Marín  , A. B. Rey  , A. Guerrero  , F. de A. Ruz
Published: July 2017

Some problems can appear using Distributed Generation (DG). A better solution for clean green energy production can be made through a cluster of Renewable Distributed Resources (DR) -such as PV cells, wind turbines, fuel cells and others- and its associated loads. This is known as micro-grid, an Edison´s concept with a remarkable future in Kyoto´s Protocol era. In spite of this strategic point of view, two main stages of the micro-grid can be taken into account: grid-connected and stand alone (intentioned island). In addition, the improvement of the local reliability has an enormous importance. Furthermore, it is clearly critical to be able to use the waste heat by placing the DR near the heat load. In conclusion, it will have implemented a Combined Heat Power (CHP).
Internalisation of externalities in the Spanish power generation sector. Impact of the national plan of allocation of emissions in the cost of generation.
Authors: F. Delgado  , A. Ortiz  , C. J. Renedo  , M. Mañana  , F. Ortiz  , L. I Eguíluz
Published: July 2017

The electric generation produces damages (externalities or environmental costs) that are not contemplated in the costs of this activity. A way to include these damages in the cost is based on the emission rights. In these instruments the total amount of allowed contamination is fixed. It is assigned to the polluting agents by means of emission permissions, creating a market of these, in which the agents can exchange them based on their interests. In 2005, Spain undertook the National Plan of Allocation of Emission Rights 2005-2007 (PNA 2005-2007). This plan has established an emission limit to the electrical sector and it has been translated in the allocation of emission rights. If this emissions limit is surpassed they must acquire rights that cover the exceeded. Thus, the companies must reduce their emissions without increasing their costs. What mix of generation is have to be implement in order to minimize the emissions, avoiding to charge the emission rights in the total generation cost?. If it is impossible to cover the demand without this extra cost, how to diminish it? These questions can be responded using optimization methods.
Preliminary steady state and dynamic analysis of a microgrid system
Authors: A. Madureira  , C. Moreira  , J. Peças Lopes
Published: July 2017

The objective of this paper is to analyse the steady state and dynamic behaviour of a MicroGrid system containing one microturbine generating Combined Heat and Power feeding some small local loads in islanded mode of operation. Future operating scenarios were also analysed and simulated, namely considering the installation of photovoltaic panels near consumers
Optimization of photovoltaic solar electric power for renewable energy generation and DSM strategies in singular apartment buildings.
Authors: J.C. Sáenz-Díez Muro  , J.M. Blanco Barrero  , E. Jiménez Macías  , M. Pérez de la Parte  , J.I. Latorre Biel
Published: July 2017

This work presents a procedure of optimization (algorithms) for the supervision, control, and management of photovoltaic solar electric power (PVSEP) in singular buildings dedicated mainly to apartments.
The basic principles of performance are kept within two big guidelines denominated Renewable Energy Generation (REG) and Demand Side Management (DSM).
From the point of view of GER it is assumed that the more electric power is generated -and therefore sent to the electric net- the more income will be obtained. On the other hand, distribution electric nets recently are having problems of apparent impossibility to attend to the demand peaks. For these reasons, from the energetic efficiency point of view it is very interesting to develop a system able to reduce the demand peaks of the buildings, that is to say, to use DSM techniques.
Some procedures (algorithms) useful to justify the installation of photovoltaic panels in buildings have been obtained and are presented in this paper. These procedures are expected to be the core of quality scientific production in our group, including some patented designs and utility models.
Rupturas neosubversivas de la literatura infantil y juvenil contemporánea
Authors: Guerrero Guadarrama Laura Marta
Published: July 2017

Este artículo revisa algunas de las rupturas anticanónicas y neosubversivas de la literatura infantil y juvenil contemporánea. Para ello se realiza una aproximación  a los conceptos de infancia, lengua y adultocentrismo,  como marco de análisis de las apuestas posmodernas más alejadas de los paradigmas dominantes. Final-mente se proponen ejemplos que refrendan una visión activa y antiautoritaria de las obras para niños.
A ENFERMAGEM NO CONTEXTO DA VIOLÊNCIA DOMÉSTICA NA INFÂNCIA: REVISÃO INTEGRATIVA
Authors: MENDES Elena Carla Batista , MOREIRA Joane de Oliveira , SANTOS Naraiane Cristina dos , SANTOS Raelli Barros dos , SOUZA Thaisa Fernanda Queiroz de
Published: July 2017

Crianças são seres indefesos e inocentes que muitas vezes acabam por serem vítimas de maus tratos pelos familiares o que lhes poderá acarretar problemas futuros. Tal situação requer abordagem da equipe interdisciplinar para investigação complexa a respeito da avaliação, diagnóstico e tratamento, sendo que o profissional indicado neste caso é o enfermeiro, pois, desde sua graduação, é preparado para cuidar do indivíduo de forma holí­stica. Este estudo teve como objetivo identificar artigos cientí­ficos no contexto da enfermagem relacionada com a violência doméstica na infância, para isso foi realizado uma revisão integrativa. O levantamento de dados do estudo foi realizado nas bases de periódicos da BVS (Biblioteca Virtual de Saúde) acessando-se o LILACS (Sistema Latino Americano e do Caribe de Informações em Ciências da Saúde), onde dos 82 artigos encontrados, 08 foram selecionados; na SCIELO (Scientific Eletronic Library Online) foram encontrados 12 artigos e 01 foi selecionado e na BDENF (Base de Dados da Enfermagem) foram encontrados 43 artigos e 01 foi selecionado, utilizando os seguintes descritores: violência doméstica, criança, enfermagem, violência intrafamiliar, crianÃ§as e enfermagem. Após a análise, foi possível identificar que há um aumento referente à preocupação com o bem-estar e saúde das crianças brasileiras. Portanto, ressalta-se a necessidade da capacitação para equipe de saúde, a fim de conscientizar os enfermeiros, profissionais da saúde e acadêmicos de enfermagem e outras profissões da saúde, para melhor identificação e atendimento às vítimas de violência.
La nueva gobernanza global y la representatividad regional en el Consejo de Seguridad de Naciones Unidas: el alcance de América Latina y Caribe
Authors: Soares Pinheiro da Cunha Rafael , Ferreira Glaser Migon Eduardo Xavier , Moutinho Vaz Carlos Alberto
Published: July 2017

En la actual distribución internacional de poder, los países en desarrollo aparecen como socios indispensables en el análisis y estudio de los principales asuntos internacionales. Sin embargo, quedan excluidos de la continua participación en los órganos de toma de decisiones, como el Consejo de Seguridad de las Naciones Unidas, evidenciando una estructura de gobierno anticuada, que compromete la legitimidad y eficacia. Este trabajo tiene como objetivo comparar el Poder Nacional, a partir de sus Expresiones política, económica y militar de los países de América Latina y Caribe con los miembros permanentes del Consejo de Seguridad de la ONU. La muestra está formada por dieciséis países, que se dividieron en dos grupos, los miembros permanentes (cinco) y América Latina y el Caribe (once). Los criterios de inclusión para este grupo fueron haber participado por tres o más oportunidades como miembro no permanente en cualquier período, o como mínimo dos ocasiones a partir de 1990, inclusive. La expresión política del Poder Nacional se analizó con la suscripción a los tratados internacionales de desarme. Acerca de la Expresión Económica, el indicador adoptado fueron las Capacidades Materiales Nacionales. Por último, la Expresión Militar tuvo como indicador el poderío militar. Los datos cuantitativos se presentan a partir de las estadísticas descriptivas, se encontró diferencias entre los grupos, y los miembros permanentes presentaron los valores promedio más altos, sin embargo, de forma individual, los países analizados tienen valores similares con los de los miembros permanentes y podrían influenciar en la estructura del gobierno global actual y la posible reforma del Consejo de Seguridad de la ONU.
THE IMPLEMENTATION OF BLUE OCEAN STRATEGY TO CREATE A MARKET NICHE
Authors: Hanifah Hanifah , Setyawati Aswanti , Octaviani Reni Dian
Published: July 2017

Business competition among companies has led to major changes. Thus, companies must be responsive to the business strategy implemented [by competitors] and create business opportunities that can generate profits. One way is to implement Blue Ocean Strategy that allows businesses to create a niche market to get out of the red ocean competition so that competition becomes irrelevant. This study is aimed at analyzing the condition of a company implementing the Blue Ocean strategy represented by PT Kintetsu World Express in the period of 2012-2013. By using the descriptive method and the theories in strategic management, it is clearly visible how the implementation of Blue Ocean Strategy by PT Kintetsu World Express Indonesia can make the company win the competition and becomes the “Market Leader”. Making the Internal Process Company (IPF - BOS) in order to optimize the implementation of Blue Ocean Strategy, making the value of the company and the products to be better in the consumer’s perspective.
Volume dan Kapasitas Jaringan Jalan di Kawasan Pondok Labu
Authors: Djamaluddin Said , Siregar Adella Hotnyda , Hendratmoko Pungkas
Published: July 2017

The  intent  of  this  study  to  analyze  the  optimization  of  highway  network  of  hospitals Fatmawati to Pondok Labu (UPN “Veteran“ Jakarta). Especially for measuring the ratio of the volume and capacity (V/C) of the facilities and infrastructure, given the congestion level above the tolerance within 2-3 km of the RS Fatmawati-UPN "Veteran" Jakarta, takes 2-3 hours the goal is to repair the target to be achieved to make people gain easy mobility around Pondok Labu Fatmawati according to their desired travel. Some of the recommendations suggested by research, must make a one-way flow (OWF) in the morning of Pondok Labu to Fatmawati hospital and vice versa for in the evening. Another recommendation is proposed, so that the dividing line in front of the giant malls are also eliminated, there is no parking along the road, a road equipped, disciplined pass-traffic control and also realocation Market Pondok Labu.