bluuebunny/crossref_metadata_2025 huggingface dataset:
Renal Functional Outcomes after Surgery, Ablation, and Active Surveillance of Localized Renal Tumors: A Systematic Review and Meta-Analysis
Authors: Patel Hiten D. , Pierorazio Phillip M. , Johnson Michael H. , Sharma Ritu , Iyoha Emmanuel , Allaf Mohamad E. , Bass Eric B. , Sozio Stephen M.
Published: May 2017

Background and objectives

Management strategies for localized renal masses suspicious for renal cell carcinoma include radical nephrectomy, partial nephrectomy, thermal ablation, and active surveillance. Given favorable survival outcomes across strategies, renal preservation is often of paramount concern. To inform clinical decision making, we performed a systematic review and meta-analysis of studies comparing renal functional outcomes for radical nephrectomy, partial nephrectomy, thermal ablation, and active surveillance.

Design, settings, participants, & measurements

We searched MEDLINE, Embase, and the Cochrane Central Register of Controlled Trials from January 1, 1997 to May 1, 2015 to identify comparative studies reporting renal functional outcomes. Meta-analyses were performed for change in eGFR, incidence of CKD, and AKI.

Results

We found 58 articles reporting on relevant renal functional outcomes. Meta-analyses showed that final eGFR fell 10.5 ml/min per 1.73 m2 lower for radical nephrectomy compared with partial nephrectomy and indicated higher risk of CKD stage 3 or worse (relative risk, 2.56; 95% confidence interval, 1.97 to 3.32) and ESRD for radical nephrectomy compared with partial nephrectomy. Overall risk of AKI was similar for radical nephrectomy and partial nephrectomy, but studies suggested higher risk for radical nephrectomy among T1a tumors (relative risk, 1.37; 95% confidence interval, 1.13 to 1.66). In general, similar findings of worse renal function for radical nephrectomy compared with thermal ablation and active surveillance were observed. No differences in renal functional outcomes were observed for partial nephrectomy versus thermal ablation. The overall rate of ESRD was low among all management strategies (0.4%–2.8%).

Conclusions

Renal functional implications varied across management strategies for localized renal masses, with worse postoperative renal function for patients undergoing radical nephrectomy compared with other strategies and similar outcomes for partial nephrectomy and thermal ablation. Further attention is needed to quantify the changes in renal function associated with active surveillance and nephron-sparing approaches for patients with preexisting CKD.
Patient-related beliefs and adherence toward their medications among the adult hypertensive outpatients in Tanzania
Authors: Jande Mary , Katabalo Deogratias M , Sravanam Praveen , Marwa Carol , Madlan Bijal , Burger Johanita , Godman Brian , Oluka Margaret , Massele Amos , Mwita Stanley
Published: May 2017

The following article has been retracted from Journal of Comparative Effectiveness Research as it did not meet the ethical standards of the Journal and the Universities, owing to the use of an invalidated MMAS-8 scale:

Jande M, Katabalo DM, Sravanam P, Marwa C, Madlan B, Burger J, Godman B, Oluka M, Massele A, Mwita S. Patient-related beliefs and adherence toward their medications among the adult hypertensive outpatients in Tanzania. J. Comp. Eff. Res. 6(3), 185–193 (2017).

The authors and editors of the Journal of Comparative Effectiveness Research regret any negative consequences this publication might have caused in the scientific and medical communities.
Familial clustering of atrial fibrillation and comparative longitudinal outcomes of familial and non-familial atrial fibrillation
Authors: Gundlund Anna , Olesen Jonas B , Peterson Eric D , Gislason Gunnar H , Fosbøl Emil L
Published: May 2017

Several studies have suggested that family history of atrial fibrillation (AF) is an important risk factor for AF, with several specific genetic regions now implicated through Genome Wide Association Studies. In addition, familial AF is associated with earlier age of onset and affects patients with fewer comorbid conditions than their non-familial counterparts. While those with familial AF have worse symptoms, all-cause mortality and risk of thromboembolic complications are similar among familial and non-familial AF patients.
What Media Probe Is All About
Authors: Beattie Earle
Published: May 2017

MEDIA PROBE was founded at a meeting held at York University on May 2, 1973, attended by people active in the field of mass media, university and community college teachers, students and others interested in this field. Donald Montgomery, president of the Labour Council of Metropolitan Toronto, and Professor Earle Beattie were co-chairmen. Barrie Zwicker served as acting secretary.
The Press as Fellow-Travellers in Toronto's Runaway Real Estate
Authors: Beattie Earle
Published: May 2017

In its lead editorial of April 8, the Toronto Star pointed out that "For the average Canadian buying a house is the biggest purchase he will ever make and he should have access to all the information available on the state of the market. And it should be unquestionably objective information."
Grant the CBC a Billion Dollars Annually by 1980
Authors: Spry Graham
Published: May 2017

On February 19, 1974. a delegation of Directors of the CBL appeared before the CATC In support of the League's brief concerning the relicensing of the CBC networks. Prepared largely by Graham Spry. Chairman of the CBL's Policy Committee, the 127 page brief examined the problems which have faced the Corporation since its inception and made recommendations or improvement in its structure and service.
Toronto Star Fires Reporter Claire Hoy, Sues Him and TV Stations on Libel Charge
Authors: Beattie Earle
Published: May 2017

On October 2, a Toronto Star reporter, Claire Hoy, appeared on CITY-TV and criticized the paper he worked for. On October 3, he was interviewed on CBLT. On October 7 he was suspended by the Star and a week later he was fired when he refused to sign a two-page prepared statement of apology.
'Saturday Night' as a Casualty of the Advertising 'Santa Claus'
Authors: Beattie Earle
Published: May 2017

If all the words of condolence, wisdom and silly comment on the suspension of publication by Saturday Night were paged up and printed in an 81/2 by 11 inch format they would produce many issues of Saturday Night. From October 7 when this 87-year old Canadian magazine folded up until the present, the press and the electronic media have poured forth genuine fears for the future of Canadian Identity if Canadian periodicals are allowed to die and shallow jeers that inadvertently show why we're in the mess we're in.
Shake-up at CTV
Authors: Beattie Earle
Published: May 2017

A dispute over editorial integrity and control from the top has shaken CTV's news and public affairs department. It has resulted in the demotion of two senior CTV news executives and left the reputation of Tom Gould, a network vice-president, in a somewhat battered condition.
Homo Americanus Explore the Wilds of 'Socred B.C.'
Authors: Beattie Earle
Published: May 2017

"Dave Barrett, British Columbia's controversial Social Credit party premier ..."
PsychoWar of the Media in Chile under Allende
Authors: Duran Claudio
Published: May 2017

(Formerly Vice-Dean of the Polytechnic Institute in Santiago, Chile, and now teaching at York University)
U.S.-Turk-Greek Junta Forced Cyprus Radio-TV Into Iago-Style Lying
Authors: Ioannides Panos
Published: May 2017

(On a leave of absence as Deputy Head of Television Programs, Cyprus Broadcasting Corporation, the author studied Communication and Mass Media at Atkinson College, York University i n 1975-76)
Media Probings
Authors: Beattie Earle
Published: May 2017

At least one bit of evidence is conclusive in the Ontario Royal Commission on Violence in the Communications Industry on the triggering of violence through the media.
Satellite Television and Cultural Imperialism
Authors: Ferguson Stewart , Ferguson Sherry D
Published: May 2017

The launching of Anik in the early 1970's generated much concern in the northern territories of Canada. With the initiation of the program, native leaders expressed resentment a t the indiscriminate transfer of culture from the southern and eastern provinces of Canada to the wilderness territories. In public hearings before the Canadian Radio-Television Commission, the Alberta Native Communications Society articulated their fears regarding the threat posed by satellite television and other similar agents of change:
Canada and U.S. Differences in Similar TV Story Content
Authors: Tate Eugene D
Published: May 2017

The content of popular television shows reflect the cultural myths and values which support the popular culture of a country. Harold Schechter has shown how the ancient gods of Olympus appear nightly on United States television.1 Horace Newcomb has pointed out that television is a "crucially important object of study not only because it is a new 'form,' a different 'medium,' but because it brings its massive audience into a direct relationship with particular sets of values and attitudes."2
Creating Reality: How Television News Distorts Events
Authors: Kline Stephen
Published: May 2017

Creating Reality is one of a group of recent books motivated by the perception that the increasing power of television news in defining the reality for the American public is a crucial social issue. The well-documented dependency of the public on TV news for information about events in the world, and the credibility with which the audience regard this coverage, have drawn a number of authors' attention to that group of people who act in their various journalistic capacities as the information gatekeepers of the nation and to the process of news production.
Media Probe - The Lethbridge Herald: Factors Involved in Joining Chain
Authors: Fooks Georgia G
Published: May 2017

In its seventy years as a Southern Alberta newspaper, The Lethbridge Herald, first as a weekly and then a daily, remained independent for fifty - four years, the last Alberta daily at the time not owned by a chain operation. Then in 1959, nine days after the formation of F.P. Publications Limited (FP), the Herald became part of that newspaper organizationl which today ranks as the largest newspaper chain in Canada in terms of circulation.'
Policy and the Talisman Chip
Authors: Beattie Earle
Published: May 2017

The calling of a federal election for May 22 has left the country in a state of limbo concerning legislation which was left on the order paper. One piece is the highly important Comnunications Bill C-24.
Wired City Pilot Project
Authors: Rockman Arnold
Published: May 2017

The "wired city" first discussed in the late sixties and early seventies is now rapidly becoming a reality. Canada leads the world in the number of households hooked up to cable TV facilities. We are also world leaders (the two facts may be connected in some way) in the number and length of our telephone conversations. During the last decade, the number of new communications technologies and the speed of their development has been truly impressive.
The Media Society: Evidence About Mass Communication in America
Authors: Kline Stephen
Published: May 2017

In the past, the academic study of communications has suffered the accusation of bearing a similar relationship to practice in the media, as jurisprudence bears to law; in both fields theoretical or analytic refinements have been of little real interest to practitioners.
The Tangled Net: Basic Issues in Canadian Communications
Authors: Kline Stephen
Published: May 2017

In the past, the academic study of communications has suffered the accusation of bearing a similar relationship to practice in the media, as jurisprudence bears to law; in both fields theoretical or analytic refinements have been of little real interest to practitioners.
Review of Inventory of Main Holdings of the Sound Archives
Authors: London Norman T
Published: May 2017

The Public Archives of Canada has just published INVENTORY OF MAIN HOLDINGS OF THE SOUND ARCHIVES / REPERTOIRE SELECTIF DES ARCHIVES SONORES. This is the first of a projected series of publications designed to inform researchers, educators, and broadcasters of the historical sound recordings held at the Public Archives.
The Case of the Canada-U.S. 'Fish War': Canadian Press Coverage of an International Dispute
Authors: Wagerberg RH , Soderlund WC , Romanow WI , Briggs ED
Published: May 2017

The role of the press in the foreign policy formation process has been for many years a subject of inquiry for scholars. Both empirical and theoretical studies have furthered our understanding of how the press serves as a link between political elites and mass publics.
The Canadian Television Industry: A Study in Contradictions
Authors: Petryszak Nicholas G
Published: May 2017

Television is probably the most pervasive of all mass meaia sources in Canada as well as one of the more influential agents of socialization available to the average Canadian.
Telephonic Lecturing
Authors: Turnbull David
Published: May 2017

The author is Media Relations Officer for Atomic Energy of Canada Limited. He holds a Bachelor of Applied Arts in Instructional Technology from the Ryerson Polytechnical Institute and an Associateship in Educational Communications from the University of London.
Oh, What a Blow That Phantom Gave Me
Authors: Essner David
Published: May 2017

"OH, WHAT A BLOW THAT PHANTOM GAVE ME"! is a book about man and his relationship to the world around him. It is a look at the different worlds as perceived by distinct cultural groups, and it is a clear indictment of the warping of society by mass media.
Stigmatization as Negotiation of Moral Meaning: A Communicational Approach
Authors: Stein AL
Published: May 2017

Let us assume that we know that the obese, the homosexual, the paraplegic, the epileptic, the medical doctor, and the beauty queen are perceived as people who are, in a sense, different from the majority of those who make up our North American Anglo-Saxon society.
The Role of the Media in Educational Conflicts
Authors: Watson Walter
Published: May 2017

The Bureau of Municipal Research in THE NEWS MEDIA AND LOCAL GOVERNMENT expresses, better than most, the assumed relationship between the media and various social institutions and processes found in most media research.2
Communications and Politics: Canada's Cautious Steps Toward Open Government
Authors: Siegel Arthur
Published: May 2017

Freedom of Information laws are aimed at providing the general public right of access to government information, i.e. documents. A walk through the offices of senior civil servants at the Privy Council Office leaves an unforgettable impression: large combination locks on the filing cabinets. There are similarly locked filing cabinets in all the departments and agencies of government at both the federal and provincial levels across Canada. Unlocking these filing cabinets and making most of the documents they contain available to the public is what freedom of information legislation is all about. "Access to documents", "open government", "right to know" are terms closely related to freedom of information and are sometimes used interchangeably. There is a democratic ring to these broad terms and the adoption of freedom of information legislation is generally seen as a step fostering democratic practices. This paper examines the tradition of secrecy in Canadian government and the increasing pressures for open government.
Confessions of a Television Addict: A Critical Review
Authors: Kline Stephen
Published: May 2017

"The true is thus the Baccanalean revel in which no member is not drunk; yet because each member collapses as soon as he drops out the revel is just as much transparent and simple repose."
The Nature of the Canadian Television Audience - A Case Study
Authors: Petryszak Nicholas G
Published: May 2017

The Canadian television audience occupies a somewhat problematic position within the framework of mass communication theory. Its problematic character is related to the diverse theoretical perspectives by which it may be analyzed and interpreted. Many theorists of the mass media argue, that in order to understand the nature of the television audience in terms of its programming preferences, prejudices and overall viewing behaviour it is necessary to recognize the complex relationships which exist between the members of the audience and the mass society in which they live. Conversely, a second theory deals with effects which television and the information obtained from it, might have on the behaviour of television viewers. It points out that in examining the effects of television, one must consider the relationship between the audience members and the various social groups to which they might belong. According to this view, it is these primary and secondary groups which mediate the messages which the audience members receive from television and thus indirectly determine their effects. Finally, there are those communication theorists who are concerned with the role which television specifically plays in Canadian society. They maintain that the nature of the Canadian audience must be related to the unique problem of the quest for Canadian cultural identity, autonomy and national unity.
Culture, Communications, and Dependency: The Tradition of H.A. Innis
Authors: Zerker Sally
Published: May 2017

In March 1978, Simon Fraser University hosted a symposium on the thought of Harold Adams Innis, the late great Canadian social scientist. I believe that even those who organized the meeting and many of the participants would agree that Innis would not have taken kindly to a project of this kind, where his own work might be in danger of overcommendation, or worse, of unthinking adulation. Nevertheless, the organizers were quite right when they assessed the need for such a conference; first, because they recognized the unfortunate loss to Canadian and international scholarship through the general neglect (except among a handful of enthusiastic specialists and followers) of Innis' innovative and insightful concepts; and second, because it was time to examine Innis' legacy as whole cloth, incorporating both streams of his thought - i.e., Canadian political economy and communication history and theory.
Patterns of Media Usage Related to Gratifications Sought
Authors: Houghton-Larsen Rick
Published: May 2017

Uses and gratifications research seeks to understand how the audience utilizes the mass media. Respondents were asked to indicate the gratification sought for six different media. Differences in usage were related to age and sex. Newspapers were utilized for local and national information. Television was the most multi-faceted media when usage was considered.
Fator inseminador num protocolo de inseminação artificial em tempo fixo: relato de caso
Authors: Bonato Gabriela Lucia
Published: May 2017

The objective of this study, we report the importance of a good artificial insemination program within a fixed time artificial insemination (TAI) during the months September to November 2010 using 29 crossbred dairy cows were divided into three lots that have followed the same Protocol: D0-implant of progesterone with estradiol benzoate, D8 - implant removal, prostaglandin and ECG, D9 (morning) - estradiol benzoate, D9 (afternoon) - GnRH and D10 - TAI. Lot one (n = 10) was inseminated in September by artificial insemination of the farm. Lot two (n = 10) was inseminated by the same artificial insemination in October, and three in the batch were inseminated by a nine animals inseminator experienced in November. The pregnancy rates were 10% (1 / 10) 20% (2 / 10) and 77.77% (7 / 9) respectively for lots one, two and three, and can confirm how much manpower trained is important for obtaining good results in reproductive programs.
Plate heat exchanger design software for industrial and educational applications
Authors: Zlatkovic Nikola , Majstorovic Divna , Kijevcanin Mirjana , Zivkovic Emila
Published: May 2017

Plate heat exchanger is a type of heat exchanger that uses corrugated metal plates to transfer heat between two fluids. The plate corrugations are designed to achieve turbulence across the entire heat transfer area thus producing the highest possible heat transfer coefficients while allowing close temperature approaches. Subsequently, this leads to a smaller heat transfer area, smaller units and in some cases, fewer heat exchangers. In this work, an application for thermal and hydraulic computations of plate heat exchangers had been developed using Sharp Develop, an open source programming platform. During the development process, several literature methods and correlations for calculation of heat transfer coefficient and pressure drop in a plate heat exchanger have been tested and the selected four methods: Martin, VDI, Kumar and Coulson and Richardson have been incorporated into the software. The structure of the software is visually presented through several windows: a window for inserting input data, windows for showing the results of computation by each of the methods, a window for showing comparative analysis of the most important computation results obtained by all of the used methods and a help window for demonstrating the working principle of plate heat exchanger.
Causes and short-term outcomes of preterm infants
Authors: Xu Aiqun , Yang Ping , Cui Wei , Li Lei , Yu Hui , Wang Haining , Quan Rengui , Song Yuchun , Xia Min
Published: May 2017

Introduction/Objective. Preterm birth (PB) is the most important reason of neonatal mortality, and the second most common direct cause of death for children under the age of five years. The aim of this study was to analyze the clinical features and outcomes of preterm infants. Methods. The clinical data of 307 preterm infants delivered in the Qingdao University hospital from January 1, 2012 to December 31, 2012 were retrospectively analyzed. Results. The incidence of PB was 6.52%. There were 143 cases of preterm prelabour rupture of membranes (PPROM) (46.58%), 66 cases of spontaneous PB (21.5%), and 98 cases of therapeutic PB (31.92%). Deliveries with gestational weeks (GW) < 32 were mainly vaginal (60.72%), but deliveries with GW ? 32 exhibited higher C-section rate (60.99%) than the vaginal delivery rate (p < 0.05). The birth weight was 2,340.46 ? 606.26 g, and the Z-score at birth was -0.15 ? 1.08. The Z-score in the group with GW within 28 to 31+6 weeks was less than that in the group with GW within 32 to 33+6 and with GW ? 34 (? < 0.05). The average hospital stay of preterm infants was 15.17 ? 12.35 days, and the most common complication in these preterm infants was respiratory distress syndrome with 13.92%. Conclusion. PB could cause a variety of serious complications in infants. The main causes of PB, such ?? PPROM, should be actively prevented and treated; meanwhile, preterm infants should also be actively treated so as to improve their outcomes.
Is there a doctor on the plane? The distinctive conditions of cardiopulmonary resuscitation on commercial flights
Authors: Pavlovic Aleksandar , Trpkovic Sladjana , Andjelic Sladjana , Videnovic Nebojsa
Published: May 2017

Even today, when over 3.5 billion passengers travel on commercial flights each year, there is confusion about the duties and role of doctors and other licensed medical professionals volunteering to provide assistance to a passenger whose life is in jeopardy, especially when it comes to measures of cardiopulmonary resuscitation in the distinctive conditions of an airborne commercial aircraft. There are still no international, standardized guidelines, rulebooks, or instructions applying to all airlines when it comes to training and organizing the cabin crew, equipping emergency medical kits and covering the role of medical professionals volunteering their services in medical emergency situations. The aim of this work was to attempt to solve a common quandary among medical professionals when it comes to airplane travel. Based on the available literature, national and regional guidelines and rulebooks of airlines, in accordance with the ethical and legal principles binding medical professionals, we have attempted to answer the major questions related to cardiopulmonary resuscitation on commercial flights. All aspects are covered ? from a doctor volunteering to provide emergency medical care, through the marshalling of the cabin attendants, the availability of equipment, interaction with the flight captain and the captain?s decision whether to perform an emergency landing, to the possibility of obtaining additional information from medical call centers on the ground and calling medical crews to the nearest airport.
Logic-based aggregation methods for ranking student applicants
Authors: Milosevic Pavle , Nesic Ivan , Poledica Ana , Radojevic Dragan , Petrovic Branislav
Published: May 2017

In this paper, we present logic-based aggregation models used for ranking student applicants and we compare them with a number of existing aggregation methods, each more complex than the previous one. The proposed models aim to include depen- dencies in the data using Logical aggregation (LA). LA is a aggregation method based on interpolative Boolean algebra (IBA), a consistent multi-valued realization of Boolean algebra. This technique is used for a Boolean consistent aggregation of attributes that are logically dependent. The comparison is performed in the case of student applicants for master programs at the University of Belgrade. We have shown that LA has some advantages over other presented aggregation methods. The software realization of all applied aggregation methods is also provided. This paper may be of interest not only for student ranking, but also for similar problems of ranking people e.g. employees, team members, etc.
Auditor Size and Going Concern Reporting
Authors: Berglund Nathan R. , Eshleman John Daniel , Guo Peng
Published: May 2017

Auditing theory predicts that larger auditors will be more likely to issue a going concern opinion to a distressed client. However, the existing empirical evidence on this issue is mixed. We attribute these mixed results to a failure to adequately control for clients' financial health. We demonstrate how properly controlling for clients' financial health reveals a positive relationship between auditor size and the propensity to issue a going concern opinion. We corroborate our findings by replicating a related study and showing how the results change when financial health variables are added to the model. In supplemental analysis, we find that Big 4 auditors are more likely than mid-tier auditors (Grant Thornton and BDO Seidman) to issue going concern opinions to distressed clients. We also find that, compared to other auditors, the Big 4 are less likely to issue false-positive (Type I error) going concern opinions. We find no evidence that the Big 4 are more or less likely to fail to issue a going concern opinion to a client that eventually files for bankruptcy (Type II error). Our results are robust to the use of a variety of matching techniques.

JEL Classifications: M41; M42.
Å kommunisere en konflikt – aktører i RTs dekning av situasjonen i Ukraina i februar–mars 2014
Authors: Østevik Malin
Published: May 2017

Communicating Conflict: Actors in RT Coverage of the Situation in Ukraine February–March 2014
This article analyses the Russian public diplomacy news organization RT’s coverage of the situation in Ukraine in February–March 2014, the period that culminated with the annexation of Crimea. It finds that enemy images were drawn of the West/USA and of Ukrainian radicals, whereas the liberal opposition and in part the new Ukrainian government were subjected to "symbolic annihilation" – that is they were not represented at all, only indirectly in depictions of the enemy image of the other actors. Locating these portrayals in the theoretical literature on "strategic narratives", the author interprets them as attempts at achieving consensus around Russia’s own perspectives on international affairs, which include the promotion of a world order in which the USA is no longer a hegemon and Russia is respected as a great power.
(Published: May 2017)
Citation: Malin Østevik (2017) «Å kommunisere en konflikt – aktører i RTs dekning av situasjonen i Ukraina i februar–mars 2014», Nordisk Østforum 31 [1], 1–21. http://dx.doi.org/10.23865/nof.v31.579
Näetkö sateenkaarten värit? Pervon yhteenkuulumisen affektiiviset politiikat
Authors: Juvonen Tuula , Kolehmainen Marjo
Published: May 2017

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Seeing the Colors of the Rainbows. Affective Politics of Queer Belonging
Authors: Juvonen Tuula , Kolehmainen Marjo
Published: May 2017

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Agricultural By-products and Waste Biomass Energy Potential in Latvia 2005–2009
Authors: Janis Kalnacs  , Ruta Bendere  , Dace Arina  , Vilis Dubrovskis
Published: May 2017

Different kinds of biomass are important renewable energy sources in Latvia. Of course firewood, wood chips and pellets are the main part of biomass, because 54,7 % of the state area is covered by forests. But also other kinds of biomass can play a significant role in the heat and electricity production, especially at municipal heating facilities. Such kinds of biomass are various agricultural and food production residues, livestock breeding buy-products, sewage sludge, organic part of household and industrial wastes, etc. In the present paper, changes of amount and distribution of variety of biomass forms in five year period are analysed. The biomass energy potential for different regions of Latvia for this period is calculated and discussed. The energy potential of agricultural by-products and organic waste are shown on the map of Latvia.
Analysis, Voltage Control and Experiments on a Self Excited Induction Generator
Authors: Birendra Kumar Debta  , Kanungo Barada Mohanty
Published: May 2017

In this paper dynamic analysis, closed loop voltage control and experiments on a self excited induction generator are presented. Electromagnetic torque, active power and reactive power are controlled under dynamic conditions of varied load, excitation capacitance and shaft speed, A closed loop voltage control scheme using a PWM Voltage Source Converter (VSC), dc link capacitor and a P-I voltage controller is proposed and implemented. This scheme generates constant voltage and variable frequency using the converter which also acts as a reactive power compensator. The frequency of stator voltage and current is varied by changing the error proportional gain making it attractive for wind energy conversion system. The simulation is done using MATLAB environment and the experimental results are also presented in this paper.
New Hybrid Power Filter for Power Quality Improvement in Industrial Network
Authors: I. Pecha  , J. Tlusty  , Z. Müller  , V. Valouch
Published: May 2017

The new topology and control strategy of the Hybrid Power Filter (HPF) with a split passive part whose impedance is divided into two individual parts tuned to 50 Hz and 250 Hz is presented. The topology is very effective to mitigate harmonic currents of a non-linear load, especially for high frequencies. The value of the voltage of fundamental frequency at terminals of an electronic power converter is in the range of several percent of that voltage at the Point of Common Coupling (PCC) at the same time. Additionally, the functionality of this HPF is affected by changes of the grid inductance only negligibly. The behaviour and properties of the new HPF were compared with those for a usual option of the HPF and for a classic passive compensation by simulation done in the Matlab/Simulink environment. The voltage and current responses and their harmonic spectra were also measured in the real industrial plant Remarkplast, Ltd. under different conditions. The results obtained were in the line with those got by a theoretical analysis done in the frequency domain and confirm the priority of the new HPF above other HPF topologies.
Introducing the Solar Radiation Atlas of Galicia, the ultimate resource to assess and exploit solar radiation in Galicia (NW Spain)
Authors: A. Pettazzi  , S. Salsón
Published: May 2017

The need to exploit the solar resource properly leads to the creation of easy-to use tools, such as maps, that must estimate the incoming solar radiation with the highest accuracy and reliability. State of the art technologies – including meteorological satellites, advanced software and high precision pyranometers – allows estimating the solar resource with high precision and accuracy, taking into account not only the climatic features of a region, but also its topography. This work collects, for the first time, a highly detailed analysis of the solar radiation in Galicia (NW Spain), using 23 years long series of satellite data put side by side with in situ measurements distributed all across the region. Insolation maps and other derived products (cloud cover, clearness index and sunshine hours) are going to be distributed for free to anyone interested in.
Merging remote sensing data with in-situ measurements of global solar radiation: the right path to estimate the solar resource in Galicia
Authors: A. Pettazzi  , S. Salsón
Published: May 2017

Among renewable sources, solar energy stands out for its availability and because it can be consumed in the same place where it is produced, reducing its environmental impact. In order to employ it properly, the energy proceeding from the sun must be characterized with the highest accuracy and reliability. State of the art technologies – including meteorological satellites, advanced software and high precision pyranometers – allows estimating the solar resource with high precision and accuracy, taking into account not only the climatic features of a region, but also its topography. This work collects, for the first time, a highly detailed analysis of the solar radiation in Galicia (NW Spain), using 23 years long series of satellite data together with in situ measurements distributed all across the region. Results show the best accuracy ever recorded.
Assessment of Financial Losses Due to Voltage Sags Using Optimal Monitoring Schemes
Authors: M. Avendaño  , J.V. Milanović  , J.V. Milanović  , M. Madrigal
Published: May 2017

The paper investigates the effectiveness of optimal placement of monitors in the assessment of financial losses due to voltage sags. Optimal sag monitoring schemes and typical power quality monitoring sites are used to perform a risk-based assessment of financial losses. The influence of the number and location of monitors on the outcome of a financial-loss analysis in voltage sag studies is also looked into. The results of the analysis are illustrated using a 295-bus generic distribution network (GDN) and considering a range of sensitive customers.
Performance Assessment of an Aeolian Roof for the Exploitation of Wind Power in Urban Areas
Authors: S. Carcangiu  , A. Montisci
Published: May 2017

In this work, an innovative system for depletion of wind power in urban areas is presented. The energy conversion system is installed in the place of the roof of the civil building, carrying out the same covering functions, but at the same time it conveys the air flow towards a vertical axis centripetal turbine. The studied system makes it possible to avoid some typical drawbacks of the eolic generation, such as the encumbrance of the blades, noise, cut-in and cut-off velocities of the wind, presence of turbulence. Due to these problems, the wind energy usually is not considered as a suitable energy source for the urban areas. In this work, a study has been performed in order to assess the potentialities of the proposed system for fulfilment of energy demands in urban areas. By means of a finite element analysis, the sensitivity with respect to the design parameters will be evaluated
VERCampus – Live Park of Renewable Energies
Authors: Vicente Leite  , José Batista  , Orlando Rodrigues
Published: May 2017

This paper presents the VERCampus Project – Live Campus  of  Renewable  Energies –  which  integrates  a  set  of technologies,  infrastructures,  and  initiatives  carried  out  in  the Campus of the Polytechnic Institute of Bragança (IPB) regarding the   renewable   energies   technologies   and   distributed   power generation systems promotion and dissemination for IPB students and  for  other  schools  and  education  levels,  stakeholders  and  all community  in  general.  The  aim  is  to  create an  attractive  and innovative   green Campus   as   a   real   platform   for   training, education and dissemination activities  in order to  understand the real cost of the energy and stimulate better behaviours in view of a  rational  use  of  energy.  The  results  consist  of  an  experimental framework   based   on   commercial   equipment   with   new   and innovative  functionalities  developed  by  students  and  teaching staff   of   IPB   in   view   of   studies   and   transfer   of   practical information   and   technology   for   the   community.   This   paper describes  the  main  activities  achieved  for  these  purposes  and some details are presented.
Modelling and Validation of the Magnetizing Curve to Represent Saturated Core Reactor Using ATP Simulator
Authors: J.A.F. Barbosa Jr  , J. C. Oliveira  , T. V. Silva  , I. N. Gondim  , F. P. Santilio  , L. N. Velasco
Published: May 2017

This  paper  is  focused  on  the  proposal  and validation  of  a  procedure  to obtain  the  necessary  data  to  model the magnetization curve of saturated core reactors as required for the   voltage   regulator   device   constituted   by   a   parallel combination of an inductive saturated unit and a fixed capacitor bank.  The  methodology  to  model  the  nonlinear  device  is  based on  constructive  parameters  and  information  associated  to  the type of magnetic material utilized to build up the equipment. The results  are  expressed  in  terms  of  the  relationship  between  the core  flux  and  current  values  which  are  used  to  feed  the ATPDraw  time  domain  simulator.  Computational  studies  are then  carried  out  to  find  the  reactive  power  absorbed  by  the reactor  as  a  function  of  the  applied  voltage,  and  the  theoretical results are compared to three prototypes having different ratings. The    experimental    results    derived    from    7kVAr-0.22kV, 600kVAr-13.8kV and 3MVAr-34.5kV products are then utilized to  validate  the  saturation  curve  ATP  representation  through  a comparative  performance  analysis  of  the  absorbed  reactive power with the voltage variation.
Batteries comparison for an optimal accumulation performance on PV isolated systems
Authors: Csaba Farkas  , László Prikler
Published: May 2017

It is reasonable to suppose that not every electric car will be charged at home sockets: some vehicle owners will eventually use charging stations. There are two options for such a charging station: it can be built either at the parking lots of shopping centers, or along highways, similar to the gas stations of today. These charging stations of course require additional feed-in of electric energy. To calculate the necessary capacity of such infeed one has to know the main operating parameters of the charging stations, such as the number of charging sockets or the parking capacity of the station. Another important parameter is the time needed to charge the battery. People do not like waiting, so a charging station must be designed taking these constraints into consideration. In this article the mathematical model of charging stations is proposed, followed by the results of the numerical simulations based on stochastic modelling of EV charging.
Energetic, economic and environmental sustainability of integrated techniques for energy production in buildings using hydrogen as storage system
Authors: C. Marino  , A. Nucara  , M. Pietrafesa  , A. Pudano  , M. Tripodi
Published: May 2017

In present days increasing attention must be paid to the control of the use of fossil fuels, major cause of greenhouse gas emission and climate change; particularly, a significant portion of total energy is consumed in buildings and could be significantly reduced both increasing energy efficiency and using renewable sources. At the moment, the intrinsic discontinuity of renewable energy limits its widespread use in buildings: anyway, integration of plants with energy storage systems could efficiently satisfy building energy demand. Within this frame, hydrogen has shown to be particularly fit in order to be used as an energetic carrier. In this aim in the paper the energetic, economic and environmental sustainability of an auto-sufficient system for energy production in buildings, based on photovoltaic panels, hydrogen storage and fuel cells is presented.
Effects of the Mutual inductances on the Switched Reluctance Machines
Authors: A. Fleury  , R. J. Dias  , W. R. H. Araújo  , A. W. F. V. Silveira  , D. A. Andrade  , G. C. Ribeiro
Published: May 2017

There are many studies which discuss the mutual inductances in the Switched Reluctance Machine – SRM. Most of these studies said that the influence of inductance is negligible. In this paper the influences of those inductances are analyzed. This work presents experimental measures and analysis of these quantities on prototypes of SRM with various settings aiming to contribute to the knowledge of the subject. The variations of the inductance profile due to the current in the active phase, the angular position of the rotor and saturation are taken into account. Surfaces are presented to summarize the behavior of the self inductance and of the mutual inductances gotten from different machines. It is presented the simulation of the SRM in generator mode taking into account the mutual inductances. The results are presented and discussed conclusively, and then some propositions are made. The results presented here reveal the relative dimension and the influence of the mutual inductances and show that they have the potential to indicate the position of the rotor of the machine, thus avoiding the use of electronic sensors allowing sensorless techniques. Furthermore, this article highlights the importance of considering the mutual inductances in the design, mathematical modeling and simulation of SRM in order to improve de machine performance.
Analysis of Cu(In, Ga)Se2 Efficiency Gap Between Module and Cell
Authors: W.-W. Hsu  , S.-W. Tan  , W. -S. Ho  , C. W. Liu
Published: May 2017

Film inhomogeneity of Si and CIGS which plays an important role for solar cell scaling are studied. The inhomogeneity is due to the process variations. The Si and CIGS modules with different key material parameter like the lifetime, doping, and band gap are simulated. The simulation results show that CIGS have larger performance degradation from the variation comparing with the Si case. And this could explain why CIGS solar cell has larger efficiency gap between the module and the small cell.
Two Control Strategies for Aggregated Wind Turbine Model with Permanent Magnet Synchronous Generator
Authors: M.J. Mercado-Vargas  , Fujin Deng  , O. Rabaza  , E. Alameda-Hernandez  , Zhe Chen
Published: May 2017

The behaviour of an aggregated wind turbine model with permanent magnet synchronous generator is studied when a wind fluctuation or a grid disturbance happens. Two control strategies are used for the generator-side converter and they are also used to evaluate the low-voltage ride-through capability of the aggregated model. MATLAB/Simulink has been used for the simulations and the results show that the proposed aggregated model behaviour follows closely the detailed one and, therefore, it is a good way to represent the wind turbine reaction.
Design and Analysis of HT-PEMFC Systems with Different Fuel Processors for Stationary Applications
Authors: S. Authayanun  , M. Mamlouk  , K. Scott  , A. Arpornwichanop
Published: May 2017

Due to its high CO tolerance,the high-temperature polymer  electrolyte  membrane  fuel  cell  (HT-PEMFC)  has  a  simpler   fuel   processing   than   a   low-temperature   polymer   electrolyte   fuel   cell   (LT-PEMFC)   system.   In   this   study,   a   performance of the HT-PEMFC integrated with a glycerol steam reformer   system   with/without   a   water   gas   shift   reactor   is   examined  and  compared  with  the  LT-PEMFC  system.  The  HT-PEMFC  system  shows  good  performance  over  the  LT-PEMFC  system  at  the  operational  condition  of  high  current  density  condition (>6000 A/m2). The presence of high CO concentration is the main problem of operation of HT-PEMFC system without the  water  gas  shift  reactor  at  high  current  density.  At  the  same  time,   the   LT-PEMFC   suffers   from   CO   poisoning   and   low   oxygen    concentration    at    high    current    density    as    well.    Considering the system efficiency, the HT-PEMFC system with the  water  gas  shift  reactor  in  the  glycerol  processor  shows  the  highest overall system efficiency.
Carbon Emission Comparison between Natural Gas and Electric Resistence for Water Heating
Authors: Gabriel Cury Martins de Oliveira  , Ricardo Abranches Felix Cardoso Junior
Published: May 2017

The use of electric showers has become a habit for most Brazilian people, being responsible for a great part in the house consumption of electric energy. This article aims to evaluate the difference between the use of electric showers or natural gas boilers in terms of energy use and greenhouse gases emissions, exposing both energy scenarios in Brazil: electric and natural gas. Therefore, it will be estimated the amount of energy necessary to heat the water average used by a person per year, for each type of shower, comparing the results and estimating the carbon emissions for both type of energies
Investigating two configurations of a heat exchanger in an Indirect Heating Integrated Collector Storage Solar Water Heating System (IHICSSWHS)
Authors: R. Mossad  , M. AL-Khaffajy
Published: May 2017

Water heating makes up 14% of domestic energy usage. Due to the environmental impact of energy usage, consumers need to be encouraged to use renewable energy sources such as solar energy. The indirect heating integrated collector storage solar water heater system (IHISSWHS) is one of the most economical systems. The objective of this study was to investigate ways to enhance the performance of this system to encourage many households using it. Two configurations of the system were studied; 16.2 m long double row heat exchanger (HX) and 8.1m and 10.8 m long single row HX. Inside pipe diameters were 10.7mm and 17.1 mm; using two flow rates 500 L/h and 650 L/h. The steady state continuity, momentum and energy equations were numerically solved, using FLUENT software. A standard k-ω turbulent model and surface to surface radiation was used. The system with 10.8 m long single row HX provided higher outlet temperature than the system with 16.2 m double row. Therefore, a significant reduction in cost and power usage can be achieved by using a single row HX. For both flow rates investigated, the larger diameter pipe need about five folds less power to run, with very little sacrifice of outlet temperature.
Sociolingüistica de la elisión de la dental -/d/- en Madrid (Distrito de Salamanca)
Authors: Molina Martos Isabel , Paredes García Florentino
Published: May 2017

En este artículo se analiza la elisión del fonema dental /d/ en posición intervocálica en Madrid (distrito de Salamanca), con objeto de caracterizar social y lingüísticamente el cambio en su doble tendencia, conservadora en el entorno general e innovadora en el entorno -ado. Se completan y reinterpretan los análisis variacionistas con otros que analizan el aporte individual con el fin de explorar una dimensión que evidencie la agentividad de los hablantes y la naturaleza performativa de la lengua en uso. Mediante análisis de correlaciones y análisis de regresión se analiza la incidencia de 26 variables en la realización del segmento y se atiende al impacto individual de los hablantes en la innovación. Original recibido el: 2014/04/25Dictamen enviado al autor: 2014/06/20Aceptado el: 2014/06/21