bluuebunny/crossref_metadata_2025 huggingface dataset:
Development and Measurement of 5 kN µ-Forming Machine
Authors: Mahmudah Aida
Published: July 2017

The need of micro part become increasingly popular which make increase of the need of prodution technology with high accuracy, productivity, efficiency, and reliability.Metal forming technology offers the solution to answer the challenge. High produtivity, zero material losses, good mechanical properties of product, and tight tolerance is able to achieve by micro forming technology. This thing make metal-forming fit for mass production based on near net shape technology concept it offered.Miniaturized effect phenomena which was not simple on micro-scale manufacturing process, demand high accuracy level from all aspect of micro-manufacturing process, which are material, tool, machinery and process. Therefore, characteristic of micro-forming machine become important in defining reliability of micro-forming system.  Micro-forming machine under investigation was 5 kN m-Forming Machine developed in Manufacturing Laboratory, Department of Mechanical Engineering, Universitas Indonesia. Modification to the machine made changes on machine characteristic. Therefore, it need characterization of the machine by measuring its geometric measurement and linear movement. The research revealed that deviation caused by imperfection of geometry of assembled machine component shown good results. Testing of linear movement of machine in one cycle show the range of deviation was 0.024 mm with smallest deviation was -0.0135 mm while the biggest one was 0.0105 mm.  The value of deviation was below etimated value which estimated from mathematical analisys of backlash. The results of machine linear movement also gave reccomendation of effective path of 5 kN m-Forming Machine, which is on path along 30 mm to 40 mm, from point A which had been decided before.
The effect of Chamfer to the Tensile Strength of Steel Jis S45cr Friction Welding Joints
Authors: Aisyah Iis Siti
Published: July 2017

Friction welding is a joining process that utilizes the force of pressure and heat from the friction to melt the tip of the workpiece in order to be connected The research has been conducted to measure the influence of the length of one side chamfer to the characteristic of the tensile strength of steel JIS45Cr friction welding joints.The research was conducted by experimental method with rotation speed 1800 rpm, time kept at 50 seconds, load used was 3.5 kg, chamfer angle was 30º and the length chamfer were 3 mm, 5 mm, 7 mm, 9 mm and 11 mm. The tensile test conducted to find the effect of the chamfer length.The result of the research concluded that the highest tensile test on length variant of 7 mm, it was 97.3505 kN/mm2 and the lowest on 3 mm was 92.9868 kN/mm2. It is proved that the chamfer length effect to thee tensile strength of friction welding.
Modification of Carbon Nanotube for Synthesis of Titania Nanotube (Tint)-Carbon Nanotube (Cnt) Composite
Authors: Heltina Desi
Published: July 2017

Carbon nanotube (CNT) is a material widely chosen for object of research in nano technology. Apart from its good absorbent property, CNT also has a unique structure, superior mechanic and electric properties and its high strength. The property of CNT above is to be expected to improve performance of Titania nanotube (TiNT) composite. Properties of pure CNT are hydrophobic at the surface and low dispersion stability. To improve dispersability of CNT then modification need to be modified. Adding Cetyl trimethyl ammonium bromide (CTAB) surfactant on CNT is a way to increase dispersion stability of TiNT-CNT. The objective of the research was to study influence of adding of Cetyl trimethyl ammonium bromide (CTAB) surfactant to synthesis of TiNT-CNT composite in degrading phenol compound. Pure CNT was added with CTAB surfactant in liquid, then was sonificated and dried. Surfactant Cetyl trimethyl ammonium bromide (CTAB) added CNT then composited with TiNT. Phenol degradation then tested by using TiNT-CNT (CTAB) in reactor for 4.5 hours. Then sample was characterized by employing Field Emission Scanning Electron Microscopy (FESEM), X-ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR) and UV-vis Spectroscopy. The result of experiments from FESEM characterization showed forming of TiNT-CNT composites morphology. From X–ray Diffraction (XRD) characterization showed crystal formed on TiNT-CNT only of anatase crystal. Degradation of TiNT-NT composite (CTAB) to phenol was also studied.
The Effects of Transient Temperature around Welds on Mechanical Properties of A36 Steel Plate
Authors: Jufri Mohammad
Published: July 2017

There are various ways for welding experts to improve their production quality, and one of which is by designing a particular type of welding tool. Besides aiming to replace the function of operator’s body parts, the tool is also able to control buckling distortions, crack propagations, and stress voltage, as well as to save an additional work, which is the heat treatment after welding process. The best method to control buckling distortions from the thin plate is by applying pre-heating and thermal tensioning. Thermal tensioning is the characterization by heat application during welding process. Transient thermal tensioning is a supporting tool around the weld which is given periodical heat by following the movement of arc welding. The purpose of this research was to minimize distortions and maximize the performance (mechanical properties) of welding joints shaped due to the transient temperature application during the welding process. The method employed in this research was experiment by using A36 steel plate with transient temperature variation of 100, 200, and 300oC, with velocity of 8 mm/s and heater (toutch) distance of 4, 6, and 8 cm. In this research, the researcher conducted tensile-strength test according to the JIS G 3101 standard and hardness test around weld, HAZ (Heat Affected Zone), and parent metal.The findings showed that the change of transient temperature and heater distance affected the mechanical properties (hardness and tensile strength) of A36 steel. The highest level of hardness was obtained in the temperature of 200°C and heater distance of 6 cm, which was as much as 404 VHN. The highest level of tensile strength was obtained in the temperature of 200°C and heater distance variation of 8 cm with yield stress of 302 Mpa and maximum tensile strength of as much as 491 Mpa.
Studi Analisa Synchronous Rectifier Buck Converter Untuk Meningkatkan Efisiensi Daya Pada Sistem Photovoltaic
Authors: Ichsan Ari Robiul , Effendy Machmud , Suhardi Diding
Published: July 2017

Abstrak-Sel surya atau sering disebut energi photovoltaic (PV) adalah energi yang saat ini popular karena PV yang sangat ramah terhadap lingkungan tetapi dalam pengaplikasiannya secara konvensional sistem PV juga banyak mengalami kekurangan terutama terhadap efisiensi daya keluaran yang terbilang rendah. salah satu faktor yang mempengaruhi terhadap efisiensi daya sistem PV yaitu pada bagian konverter DC-DC. Konverter DC-DC sebagai sumber daya sistem elektronika yang dapat ditingkatkan efisiensinya dengan cara mengganti dioda pada konverter DC dengan MOSFET. MOSFET dapat mengurangi rugi konduksi pada konverter DC sinkron karena rugi daya konduksi MOSFET lebih rendah dari rugi daya konduksi dioda. Pada perancangan ini sistem PV menggunakan konverter DC tipe penurun tegangan dengan menggunakan metode MOSFET sinkronisasi untuk menggantikan dioda pada rangkaian konverter DC tipe penurun tegangan atau juga disebut dengan synchronous buck converter. Kemudian akan dibandingkan efisiensi daya antara synchronous buck converter dengan non-synchronous buck converter. Pada sistem PV menggunakan synchronous buck converter efisiensi daya yang dihasilkan ialah mencapai 98.47%, sedangkan efisiensi daya yang dihasilkan pada non-synchronous buck converter disistem PV lebih rendah ialah 96.81%. Ini membuktikan bahwa rugi konduksi pada MOSFET lebih rendah dibandingkan dengan rugi konduksi pada dioda.
Prediksi Harga Saham Menggunakan Improved Multiple Linear Regression untuk Pencegahan Data Outlier
Authors: Izzah Abidatul , Widyastuti Ratna
Published: July 2017

Seiring berkembangnya bisnis modern, prediksi harga saham selalu mendapat perhatian khusus oleh pakar ekonomi. Prediksi nilai saham menggunakan model Multiple Linear Regression (MLR) telah terbukti memberikan nilai prediksi yang presisi dan cukup baik. Namun di sisi lain, regresi linear memiliki beberapa kelemahan terhadap data outlier. Oleh karena itu pada penelitian ini dilakukan prediksi nilai harga saham menggunakan MLR yang dibantu dengan teknik K-Means dan Moving Average (MA) untuk mengatasi pengaruh data outlier. Pengujian diawali dengan pengumpulan data dan pra-proses data. Data harga saham yang akan digunakan dalam pengujian diperoleh dari laman finance.yahoo.com dengan kategori “Jakarta Composite Index (^JKSE)”. Selanjutnya proses prediksi dilakukan dengan hybrid MLR dengan K-Means dan MA untuk mengatasi titik-titik saham yang outlier. Dari hasil yang diperoleh, dapat dilihat bahwa pendekatan paling baik ditunjukkan oleh metode MLR dan MA yakni dengan nilai MSE sebesar 15087.465, RMSE sebesar 122.831, dan MAPE sebesar 3.255.
REALITAS SOSIAL ANAK YATIM DI KOTA PADANG DALAM PERSPEKTIF PEMBERDAYAAN MASYARAKAT
Authors: Mahmuda Mardan
Published: July 2017

The economic and religious condition of orphans in the coastal and confine areas of Padang City are being concerned. While the attention of Moslem to empower their economic and religiousness is still lacked. This research focused on the disclosure of realities in poverty and religiousness of orphans in the coastal and confine areas of Padang City, then it would be analyzed based on the perspective of community empowerment by using descriptive qualitative method. The results of this study show that: (1) The reality of poverty of orphans in the coastal and confine areas of Padang City is very worrying and requires special empowerment. The poverty can be observed from the condition of house that is suffered a lot of damage and the difficulty of the expense of basic foods they encountered. (2) The reality of religiousness of orphans is also being concerned. The religious problem is considered from the implementation of prayers and reading Qur'an that they have not done best yet. Meanwhile, The attention had been given by the board of mosque and mushalla was only a bit advice when distribute of compensation money. This research is expected to be a contribution for daâ€™wah practitioners, empowerment agencies, mosque and mushalla administrators, religious institutions and other social institutions in Padang City and throughout Indonesia for the welfare of orphans through empowerment activities.
The Effect of Sample Size on the Efficiency of Count Data Models: Application to Marriage Data
Authors: Montshiwa Volition Tlhalitshi , Moroke Ntebogang Dinah
Published: July 2017

Abstract: Sample size requirements are common in many multivariate analysis techniques as one of the measures taken to ensure the robustness of such techniques, such requirements have not been of interest in the area of count data models. As such, this study investigated the effect of sample size on the efficiency of six commonly used count data models namely: Poisson regression model (PRM), Negative binomial regression model (NBRM), Zero-inflated Poisson (ZIP), Zero-inflated negative binomial (ZINB), Poisson Hurdle model (PHM) and Negative binomial hurdle model (NBHM). The data used in this study were sourced from Data First and were collected by Statistics South Africa through the Marriage and Divorce database. PRM, NBRM, ZIP, ZINB, PHM and NBHM were applied to ten randomly selected samples ranging from 4392 to 43916 and differing by 10% in size. The six models were compared using the Akaike Information Criterion (AIC), Bayesian Information Criterion (BIC), Vuong’s test for over-dispersion, McFadden RSQ, Mean Square Error (MSE) and Mean Absolute Deviation (MAD).The results revealed that generally, the Negative Binomial-based models outperformed Poisson-based models. However, the results did not reveal the effect of sample size variations on the efficiency of the models since there was no consistency in the change in AIC, BIC, Vuong’s test for over-dispersion, McFadden RSQ, MSE and MAD as the sample size increased.
The Significance of Mining Infrastructural Development on South African Economy from 1980–2013: An Econometric Approach
Authors: Marutle Ofentse William , Daw Olebogeng David
Published: July 2017

In this present paper we investigate the relationship between mining infrastructure and economic growth in South Africa from 1980-2013. The importance of this paper is to examine if there is both short and long run significant relationship between mining infrastructure and economic growth in South Africa. The data mining was collected from South African Reserve Bank (SARB) covering the range from 1980-2013 of the paper. Both Augmented Dickey Fuller (ADF) and Phillip Perron (PP) where used for stationarity tests. Johansen Cointegration test is employed in this paper; also Vector Error Correction Model (VECM) is also employed in this paper. In the results we obtained that there is a positive significant relationship between mining infrastructure and economic growth. There is also a causal relationship between mining infrastructure and economic growth, meaning the development of mining infrastructure does promote economic growth. In conclusion the policy makers should improve private infrastructure which will equip human capital to be more useful in contributing towards knowledge and innovation. This means South African government and mining industry should priorities the development of infrastructure as component that will be sufficient towards economic development.
Factors Influencing Quality of Life among Rural Populace in Nigeria
Authors: Isaac Oyeleke Ajiboye , Tanga Pius Tangwe
Published: July 2017

The study investigates factors influencing quality of life (QoL) among rural people in Nigeria. Two hundred and Twenty one (221) consenting adults within the rural area were sampled. Multi stage sampling technique was used to select respondents. Results revealed that respondents with low level of life stressor significantly reported higher score on quality of life than those with high level of life stressors. More also, there was no gender difference in the level of quality of life among the rural people. Age, gender, marital status, number of wives, number of children, and experience in rural area, occupation and educational attainment predicted quality of life. It was concluded that rural life stressor and demographic characteristics are significantly related to rural dwellers quality of life.
Asymmetric Information and Volatility of Stock Returns in Nigeria
Authors: Omokehinde Joshua Odutola , Abata Matthew Adeolu , Somoye Russell Olukayode Christopher , Migiro Stephen Oseko
Published: July 2017

This paper investigates the effect of asymmetric information on volatility of stock returns in Nigeria using the best-fit Asymmetric Power Autoregressive Conditional Heteroskedasticity, APARCH (1,1) model, under the Generalized Error Distribution (GED) at 1% significance level from 3 January 2000 to 29 November 2016. The descriptive statistical results showed that the returns were not normally and linearly distributed, with strong evidence of a heteroskedasticity effect. The results of the analysis also confirmed the effect of asymmetric information on the volatility of stock returns in the Nigerian stock market. The asymmetric parameter (γ) was negative at (-1.00), which is statistically significant at 1% level. This confirms that there is an asymmetric or leverage effect where bad news had a more destabilizing effect on the volatility of stock returns than good news. The total impact of bad news on volatility was explosive at 2.0, during the period under review. Also, the volatility persistence which is measured by the sum of ARCH(α) and GARCH(β) stood at 1.695950. This is above unity and suggests that volatility takes a long time to attenuate in Nigeria. This could be largely ascribed to the persistent effect of the 2008 global financial crisis, which probably eroded investors’ confidence in the market.
The Fallacy of Average: How Using HbA1c Alone to Assess Glycemic Control Can Be Misleading
Authors: Beck Roy W. , Connor Crystal G. , Mullen Deborah M. , Wesley David M. , Bergenstal Richard M.
Published: July 2017

HbA1c is a valuable metric for comparing treatment groups in a randomized trial, for assessing glycemic trends in a population over time, or for cross-sectional comparisons of glycemic control in different populations. However, what is not widely appreciated is that HbA1c may not be a good indicator of an individual patient’s glycemic control because of the wide range of mean glucose concentrations and glucose profiles that can be associated with a given HbA1c level. To illustrate this point, we plotted mean glucose measured with continuous glucose monitoring (CGM) versus central laboratory–measured HbA1c in 387 participants in three randomized trials, showing that not infrequently HbA1c may underestimate or overestimate mean glucose, sometimes substantially. Thus, if HbA1c is to be used to assess glycemic control, it is imperative to know the patient’s actual mean glucose to understand how well HbA1c is an indicator of the patient’s glycemic control. With knowledge of the mean glucose, an estimated HbA1c (eA1C) can be calculated with the formula provided in this article to compare with the measured HbA1c. Estimating glycemic control from HbA1c alone is in essence applying a population average to an individual, which can be misleading. Thus, a patient’s CGM glucose profile has considerable value for optimizing his or her diabetes management. In this era of personalized, precision medicine, there are few better examples with respect to the fallacy of applying a population average to a specific patient rather than using specific information about the patient to determine the optimal approach to treatment.
Global Warming Mitigation through the Local Action of Environmental Education in the Plantation Area of Palm Oil
Authors: Rushayati Siti Badriyah , Hermawan Rachmad , Meilani Resti
Published: July 2017

Oil palm is a strategic mainstay product with a crucial role in the national economy, and it can also be carbon sink to mitigate the negative impact of global warming when managed in environmentally friendly manner. Therefore, management and surrounding community need to have an understanding of the environment, and pro-environmental attitude and behaviour. Action research, which aimed at mitigating global warming through the local action of environmental education (EE), was conducted toward oil palm plantation employee and surrounding community. The EE programme was expected to be able to shape understanding and pro-environmental attitude and behaviour in the target group.  Rapid observation and interview were carried out in collecting data for EE programme development.  A needs assessment was conducted in developing the EE subject; based on local environmental problems and gap of target group’s perception of the problems.  Global warming-related environmental problems found in the location included air temperature increase, drought and difficulty in determining planting season.  Spatial analysis based on 1989 and 2014 satellite imagery showed a decrease of the water body, tree vegetated land and open areas, and an increase in non-tree vegetated land and built land, accompanied by an increase in areas with higher temperature range.  Both employees and the community had a good knowledge of the environment, but less in conservation. The environmental education provided for them had been able to increase their perception on environmental conservation. However, repetition and intensive assistance are still needed to strengthen the perception
Model Penilaian dan Pemilihan Trade Show Bagi Industri Kreatif di Sektor Mode
Authors: Rizana Afrin Fauzya , Soesanto Rayinda P. , Kurniawati Amelia
Published: July 2017

The article identifies the criteria for choosing a trade show and develops a basic model of exhibition selection for creative industry players before deciding to participate in a trade show. It is necessary to ensure that expenses in terms of business, money, and time, will be worth the results. Based on literature review and interviews, six criteria were used, namely location, booth position, organizational reputation, cost estimation, prestige, and reputation of other participants. After selection criteria are identified, then calculations are performed to measure the criteria weight by using the AHP approach. Based on weight calculations, it was found that booth positions had the highest importance weight, followed by trade show location, organizers reputation, cost estimation, prestige and reputation of other participants. The weight value is then used to calculate the trade show's prediction value. The predicted value generated from the model is then compared to the value of the past data. The model has an accuracy rate of 89% and does not have a significant difference between the value generated by the model and the value of the past data.
Central blood pressure parameters in young adults with and without parental history of hypertension
Authors: Hazari Mohammed Abdul Hannan , Arifuddin Mehnaaz Sameera , Hussain Hamza Zoeb , Fatima Farah , Kahkashan Nudrath
Published: July 2017

Hypertension is increasingly being found in children and adolescence. The purpose of this study was to find out differences in the central arterial (aortic) blood pressure parameters in young adults with hypertensive and normotensive parents. 109 healthy volunteers between the ages of 17 and 25 years were enrolled for the study after taking consent. Brachial artery pressures and aortic parameters were recorded using PeriScope™ which determines aortic parameters and functional vascular age non-invasively based on oscillometric method. The results of this study showed no statistically significant difference between offspring of hypertensive parents and offspring of normotensive parents for both peripheral and central blood pressure parameters.
Single phase shunt active filter with digital control
Authors: J. G. Pinto  , Pedro Neves  , Ricardo Pregitzer  , Luís F. C. Monteiro  , João L. Afonso
Published: July 2017

This  paper  presents  a  single-phase  shunt  active  filter designed to minimize problems related to power quality in electrical systems. The power stage of the active filter is based on  a  two-leg  full-bridge  inverter,  with  a  single  capacitor  in  the  dc side, and a filter inductor in the ac side. The control system is   based   on   the   instantaneous   power   theory   in   the   α-β-0reference  frame  (pq-theory),  derived  to  be  applied  in  single-phase systems. In essence, the shunt active filter is designed to drain, from the electric grid, harmonic and reactive components of  the  load  currents,  such  that  the  system  current  will  become,  basically, a sinusoidal waveform, with low harmonic distortion, and in phase with the system voltage. Simulation results of the shunt  active  filter  operating  with  three  different  loads  are  presented in order to verify its performance.
Developed power quality monitor used for shunt active power filter studies
Authors: J. G. Pinto  , R. Pregitze  , Luís F. C. Monteiro  , José Batista  , João L. Afonso
Published: July 2017

This paper presents a developed Power Quality Monitor used to perform studies in a prototype of a three-phase four wire Shunt Active Power Filter. In the developed equipment, the voltage measurements are made through Hall-effect sensors and for the current measurements flexible Rogowski Coil sensors are used. A conditioning circuit is used to interface the data from the sensors to a standard data acquisition board. The monitoring software was developed in LabVIEW™ that allows the applications to run on Windows in a regular PC. The developed system acquires the data continuously, and stores the desired events in the hard disk. In the case described in this paper, the Power Quality Monitor allows to simultaneously measure the three phase voltages of the power system and four currents, which can be from the source, from the load or from the output of the Shunt Active Filter.
A mixed hybrid algorithm for integral wind farm optimum design
Authors: J. Castro Mora  , Á.G. González Rodríguez  , J.M. Riquelme Santos  , M. Burgos Payán
Published: July 2017

Nowadays,   the   weight   of   the   generation   of   renewable  energies  has  grown  spectacularly  with  regard  to  other  conventional  energies.  This  is  due  to  diverse  factors:  a  bigger  environmental  concern  (Kyoto  protocol,  white-book  in  EU,  etc.),  the  raising  prices  of  the  traditional  fuels,  etc.  On  the  other hand, wind power has experienced a bigger grown, among the  renewable  energies.  That  is  why  the  development  of  an  effective  tool  for  the  design  and  lay-out  of  wind  farms  has  a  special relevance.
This paper present a mix of evolutionary algorithms to look for the  optimum  integral  design  of  the  wind  park  taking  into  account  all  the  part  involved:  number  of  wind  generators,  the  type  and  the  height  of  the  wind  generators,  its  location,  the  number  and  location  of  substations,  the  best  layout  of  low-voltage    and    high-voltage    lines    among    wind    generators,    substations and the existing transmission lines, etc.
Due  to  problem  complexity,  and  as  a  first  approach,  the  global  optimization problem has been splitted in two main (uncoupled) parts,  first  the  wind  generators  lay  out  and  then  the  network  configuration.
Wind farm optimun efficiency by voltage control
Authors: J.M. Roldán Fernández  , M.A. Caballero Gutierrez  , A.G. González Rodríguez  , M. Burgos Payán
Published: July 2017

The basic idea of improving both the power factor and the efficiency of induction motors at partial or light load reducing the supply voltage was patented by F. Nola, in the late 70's of the last century. This energy saving and power factor improvement strategy work better with small power (less efficient) motor and long periods of time with partial or light load under 25-30% of the rated power.
These improvements can be applied to the induction generators (induction machines performing as generators), were long periods of low wind speed and low level of generated power are very common. In fact, this technique is more suitable for induction generators than for motors. The soft-starter used to soften the connection transients can be used to supply the wind farm induction generators at reduced voltage during low wind speed periods. This way, more power and reactive power will be available to be injected in the transmission and distribution network at no additional cost.
Electric Mini- Challenges and solutions for the electrical powertrain
Authors: Bruno Brito  , Luís Tagaio  , Pedro Matos  , Carlos Ferreira  , Hugo Ribeiro
Published: July 2017

This paper focuses the development of an electric vehicle (EV) from the chassis of a Mini 1000. The vehicle uses two permanent magnets electrical machines coupled to the front wheels to achieve traction. The variation of the motors speed is allowed by two power electronic DC/DC converters connected to the batteries. Due to the high currents evolved there were several implementation problems. The solutions encountered are explained in this paper. Safety vehicle operation was an important issue to be achieved.
Using an integrated artificial neural networks model for predicting global radiation: The case study of Iran
Authors: A. Azadeh  , A. Maghsoudi  , S. Sohrab khani
Published: July 2017

In this article we have used artificial neural networks for predicting solar global radiation by using climatological variables in the locations that no direct measurement equipment is available. Numbers of climatological and meteorological parameters were considered for this purpose and monthly data provided for 6 years (1995- 2000) in 6 nominal cities in Iran. Separate model for each city is considered and the quantity of solar global radiation in each city is calculated. The average value of acquired results of these models has shown high accuracy about 94 % and the mean absolute percentage error (MAPE) of the models was 6.7 %. The results of these models have proved the capability of ANN models for predicting solar radiation in the locations that there is no any measurement equipment. The results of this study have shown a better accuracy than other conventional prediction models that have been used up to now.
Estimating wind turbines mechanical constants
Authors: A.G. González Rodríguez  , A. González Rodríguez  , M. Burgos Payán
Published: July 2017

The performance of wind turbines during transient situations such as the soft-starting process or in transient stability studies is strongly influenced by a broad set of mechanical parameters involved in the turbine dynamics, mainly the inertia constant, self and mutual damping and torsional stiffness. The values of these parameters use to be difficult to find because the wind turbine manufacturer/supplier usually do not supply this information. So researchers are usually forced to use vague estimated values to simulate these transients.
This communication presents an analysis of the mechanical component that models the wind turbine rotor, as well as its mechanical coupling to the generator shaft. A discussion will be introduced to question how to calculate approximate but realistic values for the wind turbine inertia time constant, preferably as a function of the blade mass and length, but also the rated wind turbine power. The dependence of the remaining mechanical wind turbine parameter values will be also provided.
Analysis of tubular-type linear generator for free-piston engine
Authors: Sun-Ki Hong  , Ho-Yong Choi  , Jae-Won Lim  , Hyo-Jae Lim  , Hyun-Kyo Jung
Published: July 2017

Tubular-type linear generator for the free-piston engine is anlayzed using finite element method and its characteristics are explaind. Magnetic characteristics of the linear generator are calculated using the finite element method and various structures are considered to achieve the lowest detent force within the rated voltage. The path of the magnetic flux is constructed by the axially magnetized magnets and the iron pole, and the detent force is minimized by adjusting the width of the magnet pole.
On wind power integration into electrical power system: Spain vs. Denmark
Authors: M. F. Cabanas  , F. Pedrayes  , C. Rojas  , M. G. Melero  , G. A. Orcajo  , J. M. Cano
Published: July 2017

The application of Finite Element Method (FEM) to the analysis of the magnetic flux in power transformers and asynchronous motors has allowed the design of two new diagnosis procedures for the early detection of failures. These new methods are by its simplicity and low cost very suitable tools for remote monitoring of power transformers and motors. In the case of transformer diagnosis the installation of search coils on the machine windings for the measurement of leakage flux allows the detection of interturn shortcircuits and winding deformation. For motor condition monitoring the measurement of the magnetic flux linked by a stator tooth permits the detection of broken bars even in the case of oscillating mechanical loads. This is an important advance with respect to the conventional motor current signature analysis techniques (MCSA), which are not reliable when the driven machine provokes mechanical oscillations in the rotor shaft. The results of simulations have been validated by means of experimental measurements on actual motors, and the utility of both methods has been demonstrated.
Testbed for virtual microgrid control strategy development
Authors: Dr. Péter Kádár
Published: July 2017

The Power System Department of the Budapest Tech educates power engineering students and performs research and development activities on power system control area, as well. In 2005-2006 a demonstrational energy park was set up on the roof of the building where the new types of the power generation methods can be investigated in practice. The park contains photovoltaic panel, wind turbine, heat pump, solar collectors and fuel cell. In the park the students make performance measurements on the individual units. Now we are working on the physical building of the microgrid that will be controlled from a SCADA console.
AC arc furnaces flicker measurement with and without a SVC system connected
Authors: M.P. Donsión  , F. Oliveira
Published: July 2017

An AC arc furnace is an unbalanced, nonlinear and time varying load, which can cause many problems to the power system quality. Different studies on arc furnaces harmonics analysis can be found in the bibliography of the topic nevertheless it is very difficult obtain an exact model that take into account all the parameters that have influence in the process then for this reason it is necessary to take measurements in different conditions. In this paper we’ll present the harmonics distortions, flicker and unbalance results and conclusions about three different measurement campaigns on a iron and steel industry (SNL) with an AC arc furnace of 83 MW (170 TM) with a transformer of 120 MVA connected by a dirty line of 220 kV (55 km) with the Carregado Substation where there are another nets connected with industrial and domestic consumers.
Mainstreaming climate change issues: Challenges for journalism education in Indonesia
Authors: Wahyuni Hermin Indah
Published: July 2017

This article aims to explain the challenges of journalism education in Indonesia on the issue of mainstreaming climate change. As the world’s largest archipelago, Indonesia has to deal with some climate change impacts such as rising sea levels, extreme weather, floods, drought, and forest fires. Climate change is a real serious threat, but public awareness of this issue is low in Indonesia. Mass media have a capacity to mainstream climate change and increase public awareness. The data for this article has been collected through qualitative content analysis of newspaper articles, interviews with communication lecturers and scholars, and document reviews. Some of the important findings are: 1) The climate change issue in the Indonesian mass media is less popular than other issues such as corruption, elections, terrorism and refugees; 2) Journalism education in Indonesia does not contribute enough to mainstreaming climate change on mass media; 3) There are three levels of problem in macro, messo, and micro level of journalism education in Indonesia to mainstreaming climate change issue. At a micro level, the problem is related to the lack of lecturers with competence in climate change. On a messo level, journalism education has failed to connect with the problem of climate change through curricula. At a macro level, the problem is related to the popularity of journalism than other subjects in general socio-political environment.  Systemic theory by Niklas Luhmann was used as tool to analyse these problems. From this perspective, Indonesian journalism education as a system faces plenty of challenges to reduce the complexity of problems to optimise its role in mainstreaming climate change.
Climate change advocacy in the Pacific: The role of information and communication technologies
Authors: Titifanue Jason , Kant Romitesh , Finau Glen , Tarai Jope
Published: July 2017

This article explores the phenomenon of the use of ICT for climate change activism in the Pacific. Climate change activism in the Pacific is characterised by the use of ICT tools such as social media. The article draws on semi-structured interviews and an analysis of social media sites to examine the use of social media in Pacific climate change campaigns. While other campaigns such as relating to West Papua have also been facilitated by social media, it has been generally NGO, citizen-led and varied in Pacific government support. In contrast, climate change campaigns in the Pacific are fully supported at the NGO, citizen, and state levels. Furthermore, while early Pacific ICT-based climate change campaigns used iconic images of Pacific Islanders leaving their homelands, more recent campaigns have leveraged social media to depict Pacific Islanders not as victims but as ‘warriors’. This new imagery aims to empower Pacific Islanders and engender a regional Pacific identity that shows strength and solidarity on the Pacific’s stance towards climate change.
The Solar Nation of Tokelau: An adventure in documentary making
Authors: Weissbach Ulrich Paul
Published: July 2017

Commentary: The Tokelau solar project first came to the attention of this filmmaker at a Pacific Energy Summit in Auckland, New Zealand, in 2013. Three remote islands in the Pacific becoming the first 100 percent solar-powered nation on earth and setting an example for the complete adaptation of sustainable energy sounded like a story too good to be overlooked by mainstream news media. However, research demonstrated that this was indeed widely ignored. So the author set about his usual practice of pitching the idea to his colleagues at German Television. The fact that he had already made a short documentary about Tokelau in 2006 (ARTE TV Reportage: Independence Referendum in Tokelau) and was thus familiar with the territory and its people, which worked in his favour. But funding proved to be a difficult challenge because the logistics of the project demanded a longer than usual shooting schedule and crew time. In the end, a solution was found by accessing additional funding and negotiating a bulk deal with the crew to make The Solar Nation of Tokelau (2014).
Pacific climate change adaptation: The use of participatory media to promote indigenous knowledge
Authors: Inamara Aaron , Thomas Verena
Published: July 2017

Pacific Island communities are increasingly experiencing the impacts of climate change. Inaccessibility to relevant information about contemporary climate change adaptation strategies at the community level presents challenges. At the same time, indigenous strategies to adapt to climate changes have been overlooked in both local and global climate change debates. This article discusses a project undertaken with a community on Andra Island, Manus Province, Papua New Guinea. Climate change impacts and adaptation strategies were explored through photo essays developed by community members, engaging in approaches of visual participatory action research and indigenous research approaches. The collaboration with the Andra Island community created a space for reflective dialogue about challenges posed by climate change as well as how photo essays can be used to promote Indigenous Knowledge (IK) as a viable capital for community-based adaptation (CBA). Within this context, this article demonstrates how climate change is both a natural and cultural process of change which poses socio-economic challenges. These challenges can compel people to engage in unsustainable practices that might exacerbate natural climate change impacts. The article highlights that building community capacity in participatory media can be an important tool to forge collective synergy, dialogue and ownership in local climate change initiatives. In particular, the authors demonstrate how participatory media can be harnessed to integrate indigenous knowledge in community-based climate change adaptation.
Newspaper coverage of climate change in Fiji: A content analysis
Authors: Chand Sarika
Published: July 2017

Media plays a crucial role in the global fight against climate change, acting as a tool for awareness, advocacy and policy change. For Fiji, this role becomes even more essential with the country’s vulnerable island system facing the direct impact of current and future climate change threats. The primary aim of this study was to analyse climate change coverage in the Fiji press. The Fiji Times, Fiji’s national newspaper, was examined to identify trends in climate change coverage between January 2004 and December 2010. A quantitative analysis was initially carried out to see the volume of reports, followed by a qualitative look into the context and thematic values of the news reports. Empirical findings showed an increase in coverage over time, although there was a transiency in the high levels of coverage when looked at on a monthly basis. Published reports also show a trend of event-based reporting with more than 80 percent of articles being generated out of or following up on a climate change convention, meeting or report launch. An overall consensus on the scientific realities of climate change in the newspaper coverage, and relatively high coverage of impacts and threats of climate change highlighted the plight of the islands. Reporting of climate change issues needs to be prioritised if the press is to fulfill its role in providing timely information on climate change. Journalists training and collaboration with national stakeholders would assist in more effective climate change coverage instead of the great reliance on one-off events to spark recognition of the major environmental problem. Developments in the discourse since this research was conducted will be worth noting as climate change has continued to rise as one of the most salient global environmental issues of our time.
REVIEW: An important book for young journalism academics
Authors: Davies Kayt
Published: July 2017

What is Journalism? The Art and Politics of a rupture, by Chris Nash. London: Palgrave Macmillan. 2016. 247 pages. ISBN 978-1-137-39933-5CHRIS NASH wrestles with ideas with rare intensity. His new book What is Journalism takes something so familiar to us, journalism, and peels back layer after layer of assumptions about what makes it singular and distinctive and what gives it parity with the other academic disciplines. More importantly though this book is a how-to guide for best-practice journalists and journalism academics looking for a lexicon to describe journalism work in a methodological way.
Constructing the Other: News media representations of a predominantly ‘brown’ community in New Zealand
Authors: Allen Jean M , Bruce Toni
Published: July 2017

Research worldwide finds that indigenous, non-white, immigrant and other marginalised communities are subjected to media coverage that negatively and narrowly stereotypes them in comparison to dominant racial groups. In this article, we explore media representations of a predominantly Pacific and lower socio-economic community in New Zealand. The results contribute to the literature regarding media coverage of minority communities through an analysis of 388 news articles, drawing on Freire’s (1996/1970) theory of antidialogical action to consider how power is used to marginalise the predominantly Pacific community of South Auckland. The results demonstrate that South Aucklanders are subjected to stereotypes and negative labelling that reinforce their marginalisation and exclusion from mainstream New Zealand culture.
ASSESSMENT OF PHYSICO-CHEMICAL PARAMETERS OF SOILS IN ZOOTECHNICAL FARMS AREA FROM TICHILEȘTI AND TUFEȘTI LOCALITIES (BRĂILA COUNTY)
Authors: GHIORGHIU Eduard-Gabriel , GLIGOR Delia , BĂLC Ramona
Published: July 2017

Two growing-fattening pig farms – non-organic and organic - have been chosen in order to estimate the potential environmental impacts of heavy pig production. The above mentioned farms are situated in Tichilești-Tufești area, Brăila County, Romania. This area is situated in the north-eastern part of the Romanian Plain, which is delimitated by the Danube River in the southern part. Is one of the highest agricultural potential areas, reflected in a development of the economical sector based on zootechnical farms. Using the electrochemical methods, the nitrites and sulphides, from soil and water, together with physico-chemical parameters have been analyzed. The obtained results indicate the presence of the above mentioned chemical compounds in a small amount, excepting one location, situated near the organic farm. The maximum permissible limits imposed by the Romanian legislation are exceeded only for drinking water, being in normal values for all analyzed soil samples. In addition, a positive correlation between clay and nitrite/sulphides content can be observed.
THE RECYCLING OF THE RUBBER WASTE BY INCORPORATION INTO THE CEMENT MATRICES
Authors: MODOI Oana-Cristina , SÂRBU Călin
Published: July 2017

The rubber wastes result mainly from the automobiles, but may also result from the construction or from other industrial activities as well as from households. Increasing the use of the rubber has generated an increase of the amount of rubber waste resulted. Thus, the increasing of the amounts of the rubber waste produces important environmental issues, especially when they are stored. The degradation of the tires take long times, by comparison, we can even say that rubber wastes have an unlimited lifetime compared to other organic wastes. In addition, in the case of an accidental ignition of the stored tires, their combustion releases gases containing hazardous chemical compounds, and fine particles, into the environment. Some of that gases produced by ignition are dangerous not only for the environment but also for the human health. These are some of the reasons why the European legislation prohibited the storage of rubbers in the landfills. In this context, the recovery and the recycling of the rubber waste to the detriment of their storage become very important.
This paper studies the possibility of the recycling of the rubber wastes by incorporating the crumbs of rubber in the cement. The rubber crumbs were added to the cement, partially replacing the fine aggregate in the cement matrix, in various proportions (10, 20, and 30% weight units). The characteristics of the resulting types of cement were evaluated from their mechanical and physical properties.
KONTRIBUSI SARANA PENDIDIKAN TERHADAP KUALITAS PENDIDIKAN DI SEKOLAH
Authors: Ariasa Giri I Made
Published: July 2017

Facilities in education are not merely those that are used in the classrooms, such as the classbooks, boards, rulers, and other learning aids, but also the ones that indirectly support the education manajemen, such as the land and building. At least such facilities should be provided in accordance with the need and function of the school (Depdiknas, 2003). Fullfilment of the need for such supporting facilities will contribute to the quality of the educational service.

There are three things that presumably can support directly the learning and achievement of the students, namely the availability of enough resources, educational aids,such as lab and workshop, and teaching medium. The absence of them will result in mere verbal teaching that cause the learning process to be less powerful. Students will only lean on the memoy for only learn to memorize things. It produces unauthentic learning pocess and situation and develop less learning experience. As the result the students acievement is low in all of its aspects, including the cognitive, attitude, skill, self-confidence, commitment, and competence.
TEORI - TEORI DALAM DUNIA PENDIDIKAN MODERN
Authors: Temon Astawa I Nyoman
Published: July 2017

The theories in education are reflections of both the Renaissance and modern era. In the history of science the discrepancy between the epistemology of the Rationalism, Empiricism, Positivism, and Saintism have become the major interest. The first theory of modern education is the Humanismand the post classical ones which include Behaviorism, Cognitivism, Humanismand Cybernetics.