bluuebunny/crossref_metadata_2025 huggingface dataset:
Cardiac-specific inducible overexpression of human plasma membrane Ca2+ ATPase 4b is cardioprotective and improves survival in mice following ischemic injury
Authors: Sadi Al Muktafi , Afroze Talat , Siraj M. Ahsan , Momen Abdul , White-Dzuro Colin , Zarrin-Khat Dorrin , Handa Shivalika , Ban Kiwon , Kabir M. Golam , Trivieri Maria G. , Gros Robert , Backx Peter , Husain Mansoor
Published: February 2018

Background: Heart failure (HF) is associated with reduced expression of plasma membrane Ca2+-ATPase 4 (PMCA4). Cardiac-specific overexpression of human PMCA4b in mice inhibited nNOS activity and reduced cardiac hypertrophy by inhibiting calcineurin. Here we examine temporally regulated cardiac-specific overexpression of hPMCA4b in mouse models of myocardial ischemia reperfusion injury (IRI) ex vivo, and HF following experimental myocardial infarction (MI) in vivo.

Methods and results: Doxycycline-regulated cardiomyocyte-specific overexpression and activity of hPMCA4b produced adaptive changes in expression levels of Ca2+-regulatory genes, and induced hypertrophy without significant differences in Ca2+ transients or diastolic Ca2+ concentrations. Total cardiac NOS and nNOS-specific activities were reduced in mice with cardiac overexpression of hPMCA4b while nNOS, eNOS and iNOS protein levels did not differ. hMPCA4b-overexpressing mice also exhibited elevated systolic blood pressure vs. controls, with increased contractility and lusitropy in vivo. In isolated hearts undergoing IRI, hPMCA4b overexpression was cardioprotective. NO donor-treated hearts overexpressing hPMCA4b showed reduced LVDP and larger infarct size versus vehicle-treated hearts undergoing IRI, demonstrating that the cardioprotective benefits of hPMCA4b-repressed nNOS are lost by restoring NO availability. Finally, both pre-existing and post-MI induction of hPMCA4b overexpression reduced infarct expansion and improved survival from HF.

Conclusions: Cardiac PMCA4b regulates nNOS activity, cardiac mass and contractility, such that PMCA4b overexpression preserves cardiac function following IRI, heightens cardiac performance and limits infarct progression, cardiac hypertrophy and HF, even when induced late post-MI. These data identify PMCA4b as a novel therapeutic target for IRI and HF.
Non-photosynthetic plastids as hosts for metabolic engineering
Authors: Mellor Silas Busck , Behrendorff James B.Y.H. , Nielsen Agnieszka Zygadlo , Jensen Poul Erik , Pribil Mathias
Published: February 2018

Using plants as hosts for production of complex, high-value compounds and therapeutic proteins has gained increasing momentum over the past decade. Recent advances in metabolic engineering techniques using synthetic biology have set the stage for production yields to become economically attractive, but more refined design strategies are required to increase product yields without compromising development and growth of the host system. The ability of plant cells to differentiate into various tissues in combination with a high level of cellular compartmentalization represents so far the most unexploited plant-specific resource. Plant cells contain organelles called plastids that retain their own genome, harbour unique biosynthetic pathways and differentiate into distinct plastid types upon environmental and developmental cues. Chloroplasts, the plastid type hosting the photosynthetic processes in green tissues, have proven to be suitable for high yield protein and bio-compound production. Unfortunately, chloroplast manipulation often affects photosynthetic efficiency and therefore plant fitness. In this respect, plastids of non-photosynthetic tissues, which have focused metabolisms for synthesis and storage of particular classes of compounds, might prove more suitable for engineering the production and storage of non-native metabolites without affecting plant fitness. This review provides the current state of knowledge on the molecular mechanisms involved in plastid differentiation and focuses on non-photosynthetic plastids as alternative biotechnological platforms for metabolic engineering.
A Cross-Sectional Study on the Hearing Threshold Levels Among People in Qinling, Qinghai, and Nanjing, China
Authors: Wang Junguo , Qian Xiaoyun , Chen Jie , Yang Ye , Gao Xia
Published: February 2018

Purpose

This study aimed to investigate the hearing threshold among different age groups, genders, and geographic areas in China to provide some insight into the appropriate clinical interventions for hearing loss.

Method

Using a systematic random sampling technique, 562 participants from Qinling, Qinghai, and Nanjing were included. Participants in the same area were divided into 3 groups according to their age. Pure-tone audiometric thresholds were measured at octave and interoctave frequencies of 0.125–16 kHz for each subject.

Results

There were significant differences in auditory thresholds at nearly all frequencies among young, middle-aged, and elderly people, and hearing thresholds increased with increasing age. People generally had the best hearing ability in Nanjing, better hearing ability in Qinghai, and the worst hearing ability in Qinling. Significant differences in hearing thresholds were found between males and females at several frequencies in Qinling.

Conclusion

People living in the rural area of Qinling in China had higher hearing threshold levels, particularly males, and hearing thresholds increased with age.
Switchable UWB/narrowband/bi‐bands octagonal antenna using PIN diodes
Authors: Bitchikh M. , Mokhtari M. , Rili W.
Published: February 2018

A reconfigurable octagonal antenna with a capability to operate in ultra‐wideband (UWB), narrowband (NB) or bi‐bands is presented. By incorporating two resonators, computation between the proposed modes becomes possible using the PIN diode switches. The UWB mode is obtained by deactivated the two resonators, while the one NB mode, is gotten by activated just one resonator. In the case of the activation of the two resonators at the same time, the antenna will be operating in the bi‐bands mode. The prototype has been simulated and measured. Both simulation and measurement have shown the same results and characterize a reconfigurable behavior, necessary for wireless applications.
Design and development of fault classification algorithm based on relevance vector machine for power transformer
Authors: Patel Dharmesh , Chothani Nilesh. G , Mistry Khyati D , Raichura Maulik
Published: February 2018

Identification of faults within power transformers is the means of ensuring unit transformer protection. Existing relay maloperates during abnormalities such as magnetising inrush, CT saturation and high resistance internal fault condition. Therefore, it is essential to categorise the internal fault and external abnormality/fault in case of transformer protection. This study presents a new scheme, based on relevance vector machine (RVM) as a fault classifier. The developed algorithm is assessed by simulating various disorders on 345 MVA, 400/220 kV transformer in PSCAD/EMTDC software and also on prototype model with 2 kVA, 230/110 V multi‐tapping transformer. One cycle post fault current signals are captured from primary and secondary to form feature vectors. These feature vectors are used as an input to RVM for classification of various test cases. Wide variation in system parameters and fault conditions are considered for test data generation and validation. The proposed scheme is compared with the support vector machine (SVM) and probabilistic neural network (PNN)‐based techniques. The proposed scheme successfully discriminates various types of internal faults and external abnormalities in power transformer within a short time. The fault classification accuracy obtained by proposed RVM technique is more than 99% in comparison to SVM and PNN‐based schemes.
Manipulation of the electromagnetic near‐fields by 3D printed coils: from design to fabrication
Authors: Mohtadi Jafari Ali , Abdolali Ali
Published: February 2018

Nowadays, the advancements in three‐dimensional (3D) printing technology have made it possible for sophisticated structures to be fabricated fast, accurate, and affordable. In this study, a new method is proposed for the manipulation of near‐electric and magnetic fields based on 3D coils. The manipulation of near‐fields is widely used in various electromagnetic problems. The 3D coils lead to 3D distributions of current paths. By changing the shape of the coil (i.e. the current path) the desired electric field or magnetic field can be achieved. During the design procedure, at first dyadic Green's functions are used to calculate the electric and magnetic fields. Also, proper basis functions are used to define the current paths. Following that, with the help of genetic algorithm, the coefficients of the basis functions, and thus the shape of 3D coils are derived for the realisation of the desired field. Finally, this method is used to realise a normal distribution on a curved path. The coils are fabricated with fused deposition modeling (FDM) 3D printing technology and by attaching the conductive wires to the printed structure. The results of design, numerical simulations, and experimental tests indicate the high performance of this technique for manipulation of near‐electric and magnetic fields.
Gain‐enhanced antenna backed with the fractal artificial magnetic conductor
Authors: Zhang Binzhen , Yao Pei , Duan Junping
Published: February 2018

The authors proposed a unidirectional, high‐gain antenna loaded with the artificial magnetic conductor (AMC) back‐cavity, which generates the reflection phase of 0° for gain enhancement in a low profile. The working bandwidth of the AMC unit cell is extended to 5.1–7.4 GHz (36.5%) by applying the fractal technology. The radiation performance improvement, wider bandwidth and increased gain are obtained for the composite antenna mounted on the fractal AMC reflector with the distance of 2 mm (0.04 wavelength at the central frequency of 6 GHz). The simulated results indicated that the operational bandwidth of the proposed antenna ranges from 4.7 to 8 GHz (52.0%). Besides, an average gain enhancement of 4 dB as compared to the original antenna without AMC back‐cavity is achieved over the entire operating band. In addition, the proposed antenna is manufactured and tested, the measured results coincide well with the simulated counterparts.
Isolated high step‐up DC–DC converter with integrated cascade structure
Authors: Lu Junlong , Wang Yi , Li Xin
Published: February 2018

In this study, an isolated high step‐up DC–DC converter with integrated cascade structure is proposed. The converter structure is equivalent to that of a cascade consisting of a boost converter and an isolated buck–boost converter. Compared with existing converters, the proposed converter can achieve a higher voltage gain with a lower transformer turn ratio. In addition, the integrated structure makes the controller more reliable and the system more compact. As the leakage inductance energy of the transformer is released to the output capacitors, the voltage spike caused by leakage inductance can be avoided, thereby reducing the voltage stress of the switches. Moreover, the zero‐voltage switching (ZVS) operation improves the conversion efficiency and the continuous input current makes a small peak current. This study discusses the operating principles of the discontinuous and continuous conduction modes in detail. The theoretical derivation of the proposed converter is provided, and the ZVS principle and conditions are presented. Finally, a prototype circuit with 40 V input voltage, 500 V output voltage, and 200 W output power is implemented to verify the validity of the theoretical analysis and the performance of the proposed converter.
Well-posed Stokes/Brinkman and Stokes/Darcy coupling revisited with new jump interface conditions
Authors: Angot Philippe
Published: March 2018

The global well-posedness in time is proved, with no restriction on the size of the data, for the Stokes/Brinkman and Stokes/Darcy coupled flow problems with new jump interface conditions recently derived by Angot et al. [Phys. Rev. E 95 (2017) 063302-1–063302-16] using asymptotic modelling and shown to be physically relevant. These original conditions include jumps of both stress and tangential velocity vectors at the fluid–porous interface. They can be viewed as generalizations for the multi-dimensional flow of Beavers and Joseph’s jump condition of tangential velocity and Ochoa-Tapia and Whitaker’s jump condition of shear stress. Therefore, they are different from those most commonly used in the literature. The case of Saffman’s approximation is also studied, but with a force balance for the cross-flow including the Darcy drag and inducing a law of pressure jump different from the usual one. The proof of these results follows the general framework briefly introduced by Angot [C. R. Math. Acad. Sci. Paris, Ser. I 348 (2010) 697–702; Appl. Math. Lett. 24 (2011) 803–810.] for the steady flow.
Production of antipollutan mask based activated carbon from wasted coconut shell
Authors: Nazif Fauzan , Sudibandriyo Mahmud
Published: February 2018

Indonesia is one of the countries with the highest levels of air pollution in the world. Air pollution in Indonesia, especially in Jakarta due to the number of private vehicles increased at least 10% every year. This air pollution can have an impact on public health. One effort to do as a protection of people health is to use a mask. Activated carbon can be coated to mask in order to improve the effectiveness in reducing the pollutants. One good material used as material for activated carbon is coconut shell. Selection of coconut shell as the raw material of activated carbon is also based on cellulose content of 26.06%, hemicellulose content 27.07% and a lignin content of 29.40% in the dry state. This research was done in some variation such as activation methods, activated carbon mass, and adhesive material types. Based on pollutants adsorption test, mask with 6 grams of activated carbon, chemically activated, and used TEOS as adhesive is the best variation that able to adsorb as much 76,25% of CO2 Pollutants. Mask made in this research, has saturation time as long as 4 hours under high CO2 concentration.
Non-square open-loop dynamic model of methyl acetate production process by using reactive distillation column
Authors: Kurniawan Ahmad Misfa , Handogo Renanto , Lee Hao-Yeh , Sutikno Juwari Purwo
Published: February 2018

The development of mathematics model especially non-square open-loop dynamic model has grown rapidly since four decades. Because of the need of simplicity and accuracy, industrial world is demanding a dynamic mathematical model as simple as possible but it still can represent the whole real process. Therefore, to meet those needs, an open-loop dynamic model of methyl acetate production process by using reactive distillation column has been built. Feed ratio, reflux ratio and reboiler duty were chosen to be the manipulated variables to make a better performance rather than only reflux flowrate and reboiler duty. Methyl acetate fraction in distillate and water fraction in bottom were still be selected as controlled variables, so a non-square open-loop dynamic model was formed.
Wet impregnation of silver oxide on Lampung natural zeolite as an adsorbent to produce oxygen-enriched air using PSA technique
Authors: Dianty Adenia Gita , Harahap Andrea Rizky Sabrina , Harfian Claudia , Bismo Setijo
Published: February 2018

High purity oxygen can be used for various things. Oxygen purification method to be applied on this research is the Pressure Swing Adsorption (PSA) technique. The adsorbent that would be used is a natural zeolite, namely ZAL (Zeolite Alam Lampung). Natural zeolite has non-polar properties, so it will adsorb gas with high quadruple moment, which is nitrogen. The varied variable is the size of adsorbent and the concentration of H2SO4. The sizes are 18-35 mesh, 35-60 mesh, and 60-100 mesh. While the H2SO4 concentration are 1M, 2M and 3M. Size of ZAL, and the concentration of sulfuric acid (H2SO4) were varied to get the optimum value. The adsorbent will be activated in aqua demine, H2SO4, NaOH, and through a calcination process. The purpose of this pre-treatment was to remove the impurities and to increase the specific surface area of zeolite. Moreover, ZAL will also be modified by wet impregnation technique using AgNO3 solution with 1%-wt loading nominal. The morphology, composition, and crystal phase were characterized by BET, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX). The result of the adsorption process was analyzed by using GC (Gas Chromatograph). ZAL 35-60 mesh 1M showed the best performance on adsorbing nitrogen, with its lowest peak at 60356 μV. The result of this research suggested that ZAL itself has the main role on adsorbing nitrogen, while AgxO did not give any significant effect
The effect of treatment with activated carbon on the metal content in reuse of lubricating oil waste
Authors: Riyanto  , Agussetianingrum Tri Astuti , Juliantydjawi Dwi Putri
Published: February 2018

The effect of treatment with activated carbon to the metal content in the reuse of lubricating oil waste has been done. Waste lubricating oil has treatment using 1-butanol and KOH as a solvent and coagulant. The research studies of the effect of activated carbon to the metals are Pb, Cr, Ca, Mg and Fe in lubrication oil waste after treatment. Waste lubricating oil treatment by the adsorption method using activated carbon with various weight are 0,5; 1,0; and 1,5 g. The metal concentrate was analysis after and before treatment using Atomic Adsorption Spectrophotometer (AAS). The analysis result shown the best weight of activated carbon for decreased of metals contains in lubricating oil waste is 1.5 g. Metal concentration of Pb, Cr, Ca, Mg and Fe in lubricating oil waste before treatment are 181.0002, 10.7198, 1019.0220, 325.8788 and 365.1329 mg/L (ppm), respectively. Metal concentration of Pb, Cr, Ca, Mg and Fe in lubricating oil waste after treatment are 47.5670, not detection, 2.6871, 44.3251 and 222.043 mg/L (ppm), respectively. Base on ASTM D5185 standard shown the Ca, Mg and Cr metals concentration according to the new lubricating oil quality standard. Pb and Fe metals concentration after process are still above the new lubricating oil quality standard. As a conclusion is activated carbon is a good material for treatment of waste lubricating oil, especially to reduce metal concentrations.
Hydrothermal carbonization of biomass waste under low temperature condition
Authors: Putra Herlian Eriska , Damanhuri Enri , Dewi Kania , Pasek Ari Darmawan
Published: February 2018

In this paper, the use of banana peel for energy purposes was investigated. Banana peel is a lignocellulosic waste since it is the most widely produced and consumed fruit in Indonesia. Among the others, hydrothermal carbonization (HTC) was chosen as alternative themochemical process, suitable for high moisture biomass. Through a 1 L stirred reactor, hydrothermal treatments were performed under low temperature condition (190, 210 and 230 °C), residence times (30 and 60 min), and biomass to water ratio (1:3, 1:5, and 1:10). Three of product were collected from the process with primary material balance. Solid phase (hydrochar) was evaluated in terms of calorific value, proximate and ultimate analysis. The results suggested that the hydrothermal carbonization of banana peel gave high heating value (HHV) of 20.09 MJ/kg for its char after dried naturally.
Fingerprint image reconstruction for swipe sensor using Predictive Overlap Method
Authors: Mardiansyah Ahmad Zafrullah , Bejo Agus , Hidayat Risanuri
Published: February 2018

Swipe sensor is one of many biometric authentication sensor types that widely applied to embedded devices. The sensor produces an overlap on every pixel block of the image, so the picture requires a reconstruction process before heading to the feature extraction process. Conventional reconstruction methods require extensive computation, causing difficult to apply to embedded devices that have limited computing process. In this paper, image reconstruction is proposed using predictive overlap method, which determines the image block shift from the previous set of change data. The experiments were performed using 36 images generated by a swipe sensor with 128 x 8 pixels size of the area, where each image has an overlap in each block. The results reveal computation can increase up to 86.44% compared with conventional methods, with accuracy decreasing to 0.008% in average.
A case study of supply chain simulation for determining the best stock allocation
Authors: Puryani  , Astanti Yuli Dwi , Fitriani Gity Nur
Published: February 2018

You Dare is a Small and Medium Enterprise (SME) engaged in fashion, namely the sale of shoes. The problems that occurred in Dare are their limit on the amount of the shoes supply from suppliers and the inventory allocation policies are unplanned, so the profit is not maximized. This study simulates inventory allocation policy that Dare applies to see the impact on profits of Dare then proceed with the design of new system scenarios. The new scenario aims to implement policies more appropriately to increase the profits of Dare. Simulations are performed with ProModel software.The results of this study indicate that the policy of only using intuition cannot maximize the profits. An appropriate policy to increase profits of Dare is to consider the demand and cost allocation. Based on simulation results, Dare will only have an average profit of IDR 52.187.000, whereas if Dare uses the proposed policy, the average profit will increase to IDR 55.948.000 within two years.
Effect of internal R&D activities to the accumulation of organizational technical knowledge with the mediation role of absorptive capacity to establish the innovation capability of electronic industries
Authors: Purwanggono Bambang , Damyana Yohana Aeria
Published: February 2018

Innovation is a strategy for the electronics industry to create a sustainable competitive advantage, in the midst of a rapidly changing environment with all its complexity. Seven AT program as an effort for PT. Hartono Istana Teknologi (Polytron) into enterprise knowledge, will accelerate the innovation process, combined with good organizational technical knowledge management. Organizational technical knowledge will be instrumental in innovation capabilities properly if there is an internal R & D activities that support and absorptive capacity as a mediator. This study reviewed the organizational technical knowledge influence to innovation capability, the influence of R & D activities to organizational technical knowledge, as well as the role of absorptive capacity as a mediator. The study was conducted by distributing questionnaires to 130 employees of PT. Hartono Istana Teknologi. Data processing was conducted using SEM. The results showed that the absorptive capacity mediate the relationship between R & D activities and organizational technical knowledge by 51%, and organizational technical knowledge affect innovation capabilities by 64%.
Product-service system method to measure sustainability level of traditional smoked fish processing industries
Authors: Purwaningsih Ratna , Cahyantari Anggaina Elfandora , Ariyani Zulfaida , Susanty Aries , Arvianto Ary , Santoso Haryo
Published: February 2018

Small Medium Enterprise’s (SME) of traditional fish processing at Semarang, Central Java, Indonesia still focus their business on gain more profits. Sustainability aspect has not received enough attention yet. This study aims to review the sustainability level of SME smoked fish Semarang using product service system (PSS) method. PSS consists of three dimensions (1) Environment, (2) Socio-cultural and (3) Economic. Each dimension consists of 6 criteria's. PSS not only assess the level of sustainability but also formulated the recommendation to increase the industries sustainability level. Sustainability assessment and recommendations formulation is guided by a check-list form. Then, the portfolio diagram used to select these recommendations according to its feasibility to be implemented and its importance for the industries. The result of sustainability assessment for traditional fish processing is 0.44, categorized as medium level. The recommendations for the environmental dimension are (1) use of liquid smoke on fish processing and (2) use of wastewater treatment with anaerobic ponds Recommendation for the socio-cultural dimension is use personal protective tool to reduce worker risk on safety and health. Recommendation for the economic dimension is used social media for product marketing and increasing the economic value of fish lung wastes. Recommendations are then illustrated in a diagram in the form of radar sustainability.
The effect of clothing fit and material of women’s Islamic sportswear on physiological and subjective responses during exercise in warm and humid environment
Authors: Wibowo Astrid Wahyu Adventri , Wijayanto Titis , Widyastuti Watri , Herliansyah Muhammad Kusumawan
Published: February 2018

The purpose of this study was to investigate the effects of clothing fit and material of Islamic sportswear for female on physiological responses and body heat balance during exercise in warm and humid environment. Twelve healthy female students (20.3±0.4 years) exercised wearing four types of women’s Islamic sportswear comprised of two level of clothing fit: loose-fit and tight-fit, and two types of material for sportswear: cotton and polyester on four separate occasions, and in random order. They performed a 30-min treadmill exercise at an intensity of 70% HRmax and then rested on a chair for 20 min for recovery in a chamber set at an ambient temperature of 34°C and relative humidity of 80%. The results showed that clothing fit did not significantly affect physiological and subjective responses, but clothing material did; sportswear made of cotton resulted in a higher increase of tympanic temperature during exercise and recovery compared to that made of polyester (P<0.05). In addition, sportswear made of cotton have lower conductive and evaporative heat loss than sportswear made of polyester (P<0.05). Clothing fit only had significant effect on conductive heat loss; that is tight-fit sportswear showed greater conductive heat loss than loose-fit one (P <0.05). Regarding subjective responses, participants reported lower thermal comfort, greater thermal sensation, and greater skin wetness sensation when performing exercise wearing tight-fit sportswear made of polyester.
Implementation of lean manufacturing to reduce waste in production line with value stream mapping approach and Kaizen in division sanding upright piano, case study in: PT. X
Authors: Santosa W. A. , Sugarindra M.
Published: February 2018

PT. XY produces musical instruments such as Upright Pianos and Grand Pianos. Due to a competitive competition, a good quality product is highly required as well as increasing the production scale. To achieve these objectives, company needs to reduce wastes occurred in its production lines, particularly in the division of sanding panel upright piano (UP) which produces type of PE B1 pianos. High cycle time and lead-time are caused by wastes in UP panel sanding division. Therefore, it is needed improvements to be applied here so that the production lines will be run more effectively and efficiently. This study aims to identify wastes using Value Stream Mapping (VSM) as a tool of lean manufacturing and to implement the improvements using Kaizen. It is found that the wastes are motion and waiting. Furthermore, the improvements (kaizen) are focused on reducing motion and waiting wastes. It is shown that cycle time decreased from 51.16 minutes to 41.90 minutes, work in process or inventory can be reduced to 24 pcs over 32 pcs, and the lead-time is 0.167 days of 0.222 days.
Research in halal logistics and halal supply chain: Issue and area development
Authors: Qurtubi  , Kusrini Elisa
Published: February 2018

Today the study of halal logistics and halal supply chain is growing and provides a great opportunity to do research both empirical and theoretical development. However, until now research in the field of logistic and supply chain is still limited. Therefore, this paper aims to explore opportunities and areas of development in this field by conducting literature review of previous research. Research opportunities in halal logistics and halal supply chain has been reviewed by many researchers and grouped into many categories, namely (1) Principles, Conceptual Model and Framework, (2) Innovation, Development and Challenges, (3) Critical Control Point, Critical Success Factors and Halal Control Activities, (4) Consumers Willingness to Pay, (5) Transportation and Information Technology, (6) Strategic approach. The issue in each category and research opportunities will be discussed in this paper.
Flow-driven simulation on variation diameter of counter rotating wind turbines rotor
Authors: Littik Y. Fredrika , Irawan Y. Heru , Bramantya M. Agung
Published: February 2018

Wind turbines model in this paper developed from horizontal axis wind turbine propeller with single rotor (HAWT). This research aims to investigating the influence of front rotor diameter variation (D1) with rear rotor (D2) to the angular velocity optimal (ω) and tip speed ratio (TSR) on counter rotating wind turbines (CRWT). The method used transient 3D simulation with computational fluid dynamics (CFD) to perform the aerodynamics characteristic of rotor wind turbines. The counter rotating wind turbines (CRWT) is designed with front rotor diameter of 0.23 m and rear rotor diameter of 0.40 m. In this research, the wind velocity is 4.2 m/s and variation ratio between front rotor and rear rotor (D1/D2) are 0.65; 0.80; 1.20; 1.40; and 1.60 with axial distance (Z/D2) 0.20 m. The result of this research indicated that the variation diameter on front rotor influence the aerodynamics performance of counter rotating wind turbines.
Point-to-point practical controller performance in an
experimental two-axes belt driven mechanism
Authors: Purtoj  , Mulfiyandi
Published: February 2018

High accuracy, fast response with no or small overshoot, and robust to object uncertainties are such performance required in a point-to-point positioning system. In order to achieve those performances, a good controller is required. A nominal characteristic trajectory following controller is one type of practical controllers which already has shown it good point-to-point positioning performance. Its structure consists of a nominal characteristic trajectory and a compensator. The design of the controller is based on a simple open loop experiment to construct a nominal characteristic trajectory. Information from nominal characteristic trajectory was then used to design the compensator. This practical approach was implemented in several different controlled objects, but limited to, system with a high stiffness mechanism. In this work, a nominal characteristic trajectory following controller was implemented on a low stiffness mechanism. An experimental two-axes belt driven mechanism was used as a controlled object. The actuator to drive the mechanism was electric motors with integrated encoders. Both axes with different characteristics identified through a simple open loop experiments and nominal characteristic trajectory constructed using speed and position data. A proportional integral compensator is selected in this work and was designed according to information from a nominal characteristic trajectory. In order to evaluate controller performance, point to point operation was conducted through simulation and experiment.
Study on the effect of Weber Number to heat transfer of multiple droplets on hot stainless steel surface
Authors: Riswanda Aria , Pranoto Indro , Deendarlianto  , Indarto  , Wibowo Teguh
Published: February 2018

Multiple droplets are drops of water that continuously dropped onto a surface. Spray cooling is an application of the use of droplet on a cooling system. Spray cooling is usually used in a cooling system of electronic devices, and material quenching. In this study, correlations between Weber number and surface temperature decrease rate during multiple droplets impingement are investigated and analyzed. Visualization process is used to help determine the evaporation time of droplets impingement by using high speed camera. Induction stove is used to maintain a stainless steel surface temperature at 120°C, 140°C, and 160°C. The Weber number was varied at 15, and 52.5 to simulate low and medium Weber number. The result of this study shows that increase in Weber number does not increase the temperature decrease rate noticeably. Whereas the Weber number decrease the time required for surface temperature to reach its lowest surface temperature. It was also found that for low and medium Weber number, Weber number affect the evaporation time of multiple droplets after impingement.
Analysis ballistic impact modeling of multicomponent fabrics with jalaba structure
Authors: Subagyo Asmanto
Published: February 2018

Various textile materials have been employed in the past for protection against the ballistic with only limited satisfaction without realizing in underlying mechanism of ballistic impact. The multicomponent fabrics was prepare by nylon yarn with plain constraction with thickness of 0.18 mm. The multicomponent fabrics were made 35 layers (laminated) with various thickness. A computational constitutive model has been developed to characterize the progressive failure behaviours of multicomponent fabrics with jalaba structure as reinforcement under high velocity impact conditions. Test result indicates that multicomponent fabric with jalaba structure can reach second level of International Standar of NIJ-010104 for hand gun (revolver) at shoot distance 5 meters. If compared with panel from biotextile composite the multicomponent fabrics have advantages in structure stability, flexibility, lightly and confortable. The integrated modeling was sucessful utilized to predict the damage and ballistic bihavior of multicomponent fabrics to various ballistic impact conditions.
Chromophoric and liability quantification of organic matters in the polluted rivers of Bandung watershed, Indonesia
Authors: Rangga Sururi Mohamad , Roosmini Dwina , Notodarmojo Suprihanto
Published: February 2018

The environmental pressure on raw water intakes has increased and affected the characteristic of Natural Organic Matters (NOMs) in many rivers in Indonesia. The purpose of this study is to determine the characteristic of NOMs and to understand the relationship among NOMs parameters in the polluted river intakes. This research was conducted in the raw water intakes of Water Supply Company in Bandung Indonesia. Statistical and spatial analysis were applied to obtain the most polluted water among the intakes. Then, water samplings from a selected intake were taken to measure three different terminologies of NOMs, which are (i) NOM which are related to lability (BOD and COD), (ii) Chromophoric NOM (UV254, UV355, and UV ¾), (iii) and fluorescent NOM (Humification Index (HIX)). In this study, the Fluorescent Excitation-Emission Matrix (F-EEM) was then measured to determine the origins of NOMs. Also, further results reveal that the characteristic of NOMs from the selected water intake is predominantly influenced by anthropogenic activities, as shown by weak relationship among lability NOM and Chromophoric NOM.
Web-based audiovisual phonetic table program application as e-learning of pronunciation practice in undergraduate degree program
Authors: Retnomurti Ayu Bandu , Octavita H. Rr. Astri Indriana
Published: February 2018

Verbal-based learning such as English pronunciation practice requires the existence of an effective e-learning because if it is directly given without any learning media, inaccuracies in pronunciation, spelling, repetition will usually occur in the spoken language. Therefore, this study aims to develop e-learning to be used in the Pronunciation Practice class, Indraprasta PGRI University. This research belongs to Research and Development are: requires an analysis, develops syllabus and teaching materials, creates and develops e-learning, tries and revises the media. Consequently, there is a need to develop module in the classroom into a versatile technology web-based module in the form of Phonetic Table Program. The result is carried out in pronunciation practice classes to find more details on some parts that may still not be detected by the researchers. Thus, the use of technology has become a necessity to assist students in achieving the learning objectives. Therefore, the process of communication in learning will attract more students’ interest and provide facilities to understand the sound system of English as it is equipped with buttons to practice presented by nonnative speakers. Non-native speakers’ selection are based on the consideration that they quickly adapt helping other students who are less fluent in English.
Decision making model design for antivirus software selection using Factor Analysis and Analytical Hierarchy Process
Authors: Nurhayati Ai , Gautama Aditya , Naseer Muchammad
Published: February 2018

Virus spread increase significantly through the internet in 2017. One of the protection method is using antivirus software. The wide variety of antivirus software in the market tends to creating confusion among consumer. Selecting the right antivirus according to their needs has become difficult. This is the reason we conduct our research. We formulate a decision making model for antivirus software consumer. The model is constructed by using factor analysis and AHP method. First we spread questionnaires to consumer, then from those questionnaires we identified 16 variables that needs to be considered on selecting antivirus software. This 16 variables then divided into 5 factors by using factor analysis method in SPSS software. These five factors are security, performance, internal, time and capacity. To rank those factors we spread questionnaires to 6 IT expert then the data is analyzed using AHP method. The result is that performance factors gained the highest rank from all of the other factors. Thus, consumer can select antivirus software by judging the variables in the performance factors. Those variables are software loading speed, user friendly, no excessive memory use, thorough scanning, and scanning virus fast and accurately.
Implementation of dataflow programming based Fuzzy Logic algorithm for gas concentration index in around of Sidoarjo mudflow, Indonesia
Authors: Widasari Edita Rosana , Prasetio Barlian Henryranu , Fitriyah Hurriyatul , Hastuti Reza
Published: February 2018

Sidoarjo mudflow or known as Lapindo mudflow erupted since 2006. The Sidoarjo mudflow is located in Sidoarjo City, East Java, Indonesia. The mudflow-affected area has high air pollution level and high health risk. Therefore, in this paper was implemented a system that can categorize the level of air pollution into several categories. The air quality index can be categorized using fuzzy logic algorithm based on the concentration of air pollutant parameters in the mudflow-affected area. Furthermore, Dataflow programming is used to process the fuzzy logic algorithm. Based on the result, the measurement accuracy of the air quality index in the mudflow-affected area has an accuracy rate of 93.92% in Siring Barat, 93.34% in Mindi, and 95.96% in Jatirejo. The methane concentration is passes the standard quality even though the air quality index is safe. Hence, the area is indicated into Hazardous level. In addition, Mindi has highest and stable methane concentration. It means that Mindi has high-risk air pollution.
Simulation of trust-based attacks in Internet of Things
Authors: Suryani Vera , Sulistyo Selo , Widyawan Widyawan
Published: February 2018

Security issue in Internet of Things (IoT) is one of the most important aspects to be resolved. Some attacks that occurred in Internet technology are also penetrated IoT. A trust-based security system is a promising solution in IoT as it is suitable for the characteristic of IoT which is distributed, decentralized control and on-off connections. Knowing the behaviors of the attacks might help up to understand of how we may prevent the attacks and plan to mitigate the attacks. In this paper, we simulated trust-based attacks in IoT environment by giving the fake reputation values of an object. For this purpose, we utilized ConTrust model, a trust-based security model. Matlab was used to simulate the attacks, and the simulation result showed that ConTrust model was outperformed on mitigating a trust-based attack. The attack was detected and resolved correctly.
Changes in folate characteristics and its identification in broccoli (Brassica oleracea Italica) extract fermented by Lactic Acid Bacteria Mixed Culture (LAB)
Authors: Maryati Yati , Susilowati Agustine
Published: February 2018

Broccoli (Brassica oleracea Italica) was fermented by cultures of lactic acid bacteria (LAB) as a potential source of natural folic acid. This study aimed to evalte characteristic changes and to identify folate compounds from broccoli extract, fermented by mixed LAB cultures (L. bulgaricus, S. thermophulus, L.acidophilus, Bd. bifidum). The formulation of broccoli extract was fermented with variation of LAB starter culture with concentrations of 10 and 20%(v/v), and the change of characteristic of folic acid compound during fermentation (0 to 48 hours) with an interval of 8 hours was evaluated. The results showed that the fermentation of broccoli extract with different concentration of LAB culture had an effect on the concentration of folic acid produced, as well as the change of concentration of folic acid during the fermentation time interval. The optimum condition was obtained based on the highest folic acid concentration of 6.74%, at culture concentration of 20% during 24 hour fermentation with the value of folic acid concentration of 72.11 μg/mL, pH value of 4.29, total sugars of 34.61%, total acids of 0, 97%, dissolved protein of 14.64 mg/mL and total LAB of log 13.02 + 0.05 cfu / ml.
Dual-Polarized Antenna Sub-Array of 2×2 Elements for Measurements of Short Electromagnetic Pulses
Authors: Balzovsky Evgeny , Buyanov Yury , Koshelev Vladimir , Nekrasov Eduard
Published: February 2018

Results of the investigations of a dual-polarized antenna module of a 2×2 receiving antenna array designed for recording the waveform of short electromagnetic pulses are presented. Each element of the antenna array is an active dipole that is loaded on the single-stage FETbased amplifier. Results of the measurements of the patterns, effective length, and waveforms of the recorded pulses are presented.
Parametric Nonlinear Locator
Authors: Antipov Vladimir , Shipilov Sergey
Published: February 2018

The device relates to the field of radar techniques for locating or objects detecting using reflection or reradiation of radio waves. This device can be used to detect and identify the objects containing non-linear electrical contacts. The non-linear radar contains two sources of signals that generate the signals in close frequency rangers, and a signal combining scheme associated with the antenna. The source of the first signal is provided with a low-frequency modulator. A vector reflectometer is included between the source of the second signal and the signal combining circuit. The design is simplified and the detectability of the non-linear radar is improved due to these design features.
A Competence-Based Approach to Training Specialists in the Digital Society
Authors: Liventsova Evgenia , Rumyantseva Tatiana , Syryamkina Ekaterina
Published: February 2018

The article analyzes the influence of digital technologies on transformation of the labor market in social services. Modern professions require workers with advanced digital skills as well as technical and engineering specialists with advanced soft skills. The article analyzes official documents and global trends in the future labor market and presents the experience of National Research Tomsk State University (TSU) in developing transprofessional skills of students in different specialties. The authors conclude that modern society and the labor market demand new forms and methods of education aimed to develop interdisciplinary competence.
Identification of a Personality
Authors: Kuznetsov Denis
Published: February 2018

Biometric technologies are based on biometrics, measurement of the unique characteristics of a certain person. These are the unique signs received by a person from birth and acquired characteristics that can change under the influence of time or external environment. This article discusses the principles of operation, types of biometric identification systems, describes examples and areas of their application.
Evolution of Mobile Applications
Authors: Phongtraychack Anachack , Dolgaya Darya
Published: February 2018

Currently, we can see the rapid evolution of mobile technology, which involves mobile communication, mobile hardware, and mobile software. Features of mobile phones largely depend on software. In contemporary information and communication age [1–4], mobile application is one of the most concerned and rapidly developing areas. At the same time, the development of mobile application undergoes great changes with the introduction of new software, service platforms and software development kits (SDK). These changes lead to appearance of many new service platforms such as Google with Android and Apple with iOS. This article presents the information about the evolution of mobile application, gives some statistical data on the past and present situation, demonstrates how individual users of mobile devices can benefit, and shows how mobile applications affect society from the ethical perspective.
The Numerical Simulation of the Shielded Helmholtz Coils System Magnetic Field
Authors: Zatonov Ivan , Baranov Pavel
Published: February 2018

This article describes the calculation of the magnetic field in the axial direction for the Helmholtz coil. The inhomogeneity of the magnetic field for this coil system is calculated. Authors defined the functional connection of the magnetic flux density in the system center from the antimagnetic shield thickness in two ways: iron and Finemet alloy shield. The dependency graph of the magnetic field inhomogeneity in the center of shielded Helmholtz coils system from the axial coordinate value is estimated
Rôle et limitations de la plasmonique pour le photovoltaïque solaire
Authors: Collin Stéphane , Cattoni Andrea
Published: February 2018

À la fin des années 2000, la plasmonique a connu un engouement considérable au sein de la communauté photovoltaïque (PV) : le confinement de la lumière à l’échelle nanométrique devait offrir de nouveaux degrés de liberté dans la conception des cellules solaires, avec l’espoir de diminuer les coûts et d’augmenter les rendements des cellules solaires. Petit bilan après une décennie de recherches intensives.