bluuebunny/crossref_metadata_2025 huggingface dataset:
Field‐controlled switchable frequency selective surface with broadband absorption characteristic
Authors: Zhou Qihui , Liu Peiguo , Yu Dingwang , Bian Lian , Liu Chenxi
Published: February 2018

A field‐controlled switchable frequency selective surface (FSS) with broadband absorption characteristic is proposed here, which comprises a switchable screen and a periodic resistive surface. The structure permits transmission of small signal with little attenuation and reflects high‐energy signal spontaneously within the operating band around 2.1 GHz. Also it can absorb out‐of‐band electromagnetic wave from 6 to 17 GHz. The simulated results demonstrate that the FSS has favourable switching and absorption performance over 0–30° for incident wave, verified by experiment. This novel FSS integrating different functions has various prospects of applications in electromagnetic protection, electromagnetic compatibility, electromagnetic interference along with stealth technology.
Efficient modelling of IEEE 802.11p MAC output process for V2X interworking enhancement
Authors: Salem Fatma , Elhillali Yassin , Niar Smail
Published: February 2018

Vehicle‐to‐anything (V2X) is a promising communication technology, which expected to revolutionise the ground transportation system by improving traffic safety and efficiency for people on roads. The future deployment of V2X requires interworking between different access technologies, i.e. dedicated short‐range communications (DSRCs) and cellular networks. However, to achieve an efficient V2X interworking, the authors need to resolve the multi‐hop issue, mainly originating from the V2X hybrid architecture. To resolve this issue and consequently to enhance the interconnected system, characterising the output process of IEEE 802.11p‐based DSRC medium access control protocol is of a fundamental importance. This study proposes regenerative model to provide a complete description of IEEE 802.11p output process. The accuracy of the model is verified through extensive simulations. As a case study, the proposed model is compared with Poisson model in the performance evaluation of V2X interworking. Numerical and simulation results verify the ability of the regenerative model to capture the deviations of the actual output process of IEEE 802.11p under different traffic intensities as compared with the Poisson model.
Performance evaluation of distance relay in the presence of hybrid SFCL
Authors: Barzegar‐Bafrooei Mohammad Reza , Akbari Foroud Asghar
Published: February 2018

This study presents a detailed analysis about the impact of hybrid superconducting fault current limiter (HSFCL) on distance relay performance through the analytical and simulation techniques. For assessments, two possible installation locations for HSFCL (before or after potential transformer (PT)) are considered here which has not been evaluated in the literature so far. Moreover, the impact of action time of fast mechanical switch implemented in the HSFCL structure on impedance trajectory and trip time is investigated. The obtained results show the adverse impact of HSFCL on distance relay performance in all cases. Specially, for forward faults, the worst case happens when HSFCL is installed at the downstream of PT. Using quadrilateral characteristic instead of mho can improve the performance of distance relay; however, this way does not fulfil the enough security and sensitivity under different conditions. Therefore, two approaches are proposed to overcome these challenging situations: (i) modifying trip region of distance relay with respect to the HSFCL impedance and (ii) the new impedance calculation procedure. The significant aspect of the proposed solutions compared with the existing techniques is that the accuracy of distance relay is improved without using additional hardware to provide information from HSFCL.
VISION - Vienna Survey in Orion
Authors: Meingast Stefan , Alves João , Lombardi Marco
Published: February 2018

We have investigated the shape of the extinction curve in the infrared up to ~25μm for the Orion A star-forming complex. The basis of this work is near-infrared data acquired with the Visual and Infrared Survey Telescope for Astronomy, in combination with Pan-STARRS and mid-infrared Spitzer photometry. We obtain colour excess ratios for eight passbands by fitting a series of colour-colour diagrams. The fits are performed using Markov chain Monte Carlo methods, together with a linear model under a Bayesian formalism. The resulting colour excess ratios are directly interpreted as a measure of the extinction law. We show that the Orion A molecular cloud is characterized by flat mid-infrared extinction, similar to many other recently studied sightlines. Moreover, we find statistically significant evidence that the extinction law from ~1μm to at least ~6μm varies across the cloud. In particular, we find a gradient along galactic longitude, where regions near the Orion Nebula Cluster show a different extinction law compared to L1641 and L1647, the low-mass star-forming sites in the cloud complex. These variations are of the order of only 3% and are most likely caused by the influence of the massive stars on their surrounding medium. While the observed general trends in our measurements are in agreement with model predictions, both well-established and new dust grain models are not able to fully reproduce our infrared extinction curve. We also present a new extinction map featuring a resolution of 1′ and revisit the correlation between extinction and dust optical depth. This analysis shows that cloud substructure, which is not sampled by background sources, affects the conversion factor between these two measures. In conclusion, we argue that specific characteristics of the infrared extinction law are still not well understood, but Orion A can serve as an unbiased template for future studies.
Understanding type Ia supernovae through their U-band spectra
Authors: Nordin J. , Aldering G. , Antilogus P. , Aragon C. , Bailey S. , Baltay C. , Barbary K. , Bongard S. , Boone K. , Brinnel V. , Buton C. , Childress M. , Chotard N. , Copin Y. , Dixon S. , Fagrelius P. , Feindt U. , Fouchez D. , Gangler E. , Hayden B. , Hillebrandt W. , Kim A. , Kowalski M. , Kuesters D. , Leget P.-F. , Lombardo S. , Lin Q. , Pain R. , Pecontal E. , Pereira R. , Perlmutter S. , Rabinowitz D. , Rigault M. , Runge K. , Rubin D. , Saunders C. , Smadja G. , Sofiatti C. , Suzuki N. , Taubenberger S. , Tao C. , Thomas R. C. ,   The Nearby Supernova Factory
Published: February 2018

Context. Observations of type Ia supernovae (SNe Ia) can be used to derive accurate cosmological distances through empirical standardization techniques. Despite this success neither the progenitors of SNe Ia nor the explosion process are fully understood. The U-band region has been less well observed for nearby SNe, due to technical challenges, but is the most readily accessible band for high-redshift SNe.

Aims. Using spectrophotometry from the Nearby Supernova Factory, we study the origin and extent of U-band spectroscopic variations in SNe Ia and explore consequences for their standardization and the potential for providing new insights into the explosion process.

Methods. We divide the U-band spectrum into four wavelength regions λ(uNi), λ(uTi), λ(uSi) and λ(uCa). Two of these span the Ca H&K λλ 3934, 3969 complex. We employ spectral synthesis using SYNAPPS to associate the two bluer regions with Ni/Co and Ti.

Results. The flux of the uTi feature is an extremely sensitive temperature/luminosity indicator, standardizing the SN peak luminosity to 0.116 ± 0.011 mag root mean square (RMS). A traditional SALT2.4 fit on the same sample yields a 0.135 mag RMS. Standardization using uTi also reduces the difference in corrected magnitude between SNe originating from different host galaxy environments. Early U-band spectra can be used to probe the Ni+Co distribution in the ejecta, thus offering a rare window into the source of light curve power. The uCa flux further improves standardization, yielding a 0.086 ± 0.010 mag RMS without the need to include an additional intrinsic dispersion to reach χ2∕dof ~ 1. This reduction in RMS is partially driven by an improved standardization of Shallow Silicon and 91T-like SNe.
Detailed chemical compositions of the wide binary HD 80606/80607: revised stellar properties and constraints on planet formation
Authors: Liu F. , Yong D. , Asplund M. , Feltzing S. , Mustill A. J. , Meléndez J. , Ramírez I. , Lin J.
Published: February 2018

Differences in the elemental abundances of planet-hosting stars in binary systems can give important clues and constraints about planet formation and evolution. In this study we performed a high-precision, differential elemental abundance analysis of a wide binary system, HD 80606/80607, based on high-resolution spectra with high signal-to-noise ratio obtained with Keck/HIRES. HD 80606 is known to host a giant planet with the mass of four Jupiters, but no planet has been detected around HD 80607 so far. We determined stellar parameters as well as abundances for 23 elements for these two stars with extremely high precision. Our main results are that (i) we confirmed that the two components share very similar chemical compositions, but HD 80606 is marginally more metal-rich than HD 80607, with an average difference of +0.013 ± 0.002 dex (σ = 0.009 dex); and (ii) there is no obvious trend between abundance differences and condensation temperature. Assuming that this binary formed from material with the same chemical composition, it is difficult to understand how giant planet formation could produce the present-day photospheric abundances of the elements we measure. We cannot exclude the possibility that HD 80606 might have accreted about 2.5 to 5 MEarth material onto its surface, possibly from a planet destabilised by the known highly eccentric giant.
Transfert en cadmium et zinc vers l’orge de printemps en sols contaminés et non contaminés de Belgique : évaluation et prédiction
Authors: Liénard Amandine , Colinet Gilles
Published: February 2018

En Région wallonne, des sols agricoles situés à proximité d’anciens sites de traitements de minerais ont été impactés par des retombées atmosphériques contaminées en cadmium (Cd), plomb (Pb) et zinc (Zn). Afin d’étudier l’impact de ces contaminations sur la qualité des productions agricoles, une étude du transfert en Cd et Zn du sol vers l’orge de printemps (Hordeum vulgare L.) a été réalisée sur une de ces zones contaminées. Dix-huit prélèvements d’orges ont été effectués en zone contaminée, 10 autres en zone témoin non contaminée et chacun d’eux a été subdivisé en trois sous-échantillons (tige, épi et grain). Un prélèvement a été réalisé dans l’horizon de surface du sol (de 0 à 20 cm) à l’emplacement de chaque prélèvement de plantes. Les concentrations disponibles et pseudo-totales en éléments traces et majeurs ainsi que pHeau, pHKCl, carbone organique total et azote total ont été mesurés sur les échantillons de sols. Les concentrations en Cd et Zn ont été dosées dans les grains, les épis et les tiges. Les concentrations en Cd et Zn mesurées dans les plantes récoltées sur la zone contaminée sont de 2 à 9 fois supérieures à celles mesurées dans les orges témoins. Il existe peu de relations entre la concentration en cadmium dans les grains (CdGrain), la concentration en zinc dans les grains (ZnGrain) et les propriétés des sols à l’exception des teneurs en Cd et Zn du sol. Une analyse Cate-Nelson a permis d’estimer CdGrain à 0,027 mg de Cd/kg matière sèche (MS) pour des teneurs pseudo-totales en Cd dans le sol allant de 0 à 1,23 mg/kg, et à 0,118 mg de Cd/kg de MS pour des teneurs pseudo-totales en Cd dans le sol allant de 1,24 à 6,87 mg/kg. ZnGrain est estimé à 19,2 mg/kg de MS pour des teneurs pseudo-totales de Zn dans le sol allant de 0 à 131 mg/kg, et à 40 mg/kg de MS pour des teneurs pseudo-totales de Zn dans le sol allant de 132 à 570 mg/kg. Une estimation du transfert en Cd et Zn reste toutefois complexe dans ces sols multicontaminés.
Manufacture of fiber composite materials musa acuminate l. prepared by the randomized position with polymer matrix resin
Authors: Ni’mah Lailan , Akbari M. Rizka , Khan Ferdi Akhmad , Ma’ruf M. Afief
Published: February 2018

Composite is a system composed by mixing two or more different materials, in the form and composition of materials that do not dissolve each other. In general, the composite material is a material that has some properties that may not be owned by each component. This study aims to determine the effect of immersion banana fiber in NaOH solution, the composition ratio of the difference between the banana fiber to resin used and find the resistance of composite products produced against the pressure test and tensile test. This study begins with taking fiber banana followed by delignification process to remove lignin in the raw material, then molding composites made with a composition that has been set. The resulting composite will be tested durability to perform pressure tests (ASTM D 695) and a tensile test (ASTM D 638). To test tap on the position of the randomized to the concentration of NaOH 0%, 3%, 5% and 7% respectively, each for 53.716 N/mm 2, 43.184 N/mm 2, 81.724 N/mm 2 and 30.032 N/mm 2. For tensile test on an randomized position with NaOH concentration of 0%, 3%, 5% and 7% respectively, each for 21.519 M.Pa, 18.359 M.Pa, 31.033 M.Pa and 21.064 M.Pa.
Simulation study of the biodiesel production from palm fatty acid distillate using palm empty fruit bunch catalyst in reactive distillation column
Authors: Hidayat Arif , Sutrisno Bachrun
Published: February 2018

In this paper, the simulation study of biodiesel production from Palm Fatty Acid Distillate (PFAD) using Palm Empty Fruit Bunch (PEFB) catalyst as the heterogeneous acid catalyst in reactive distillation (RD) column was studied. The main parameters of the basic RD column such as the number of stages, molar ratio of feed, total number of stages, and reboiler heat duty were employed in the simulation study. The equilibrium stage and rate-based models were used for the RD simulation studies. The simulation studies show that the equilibrium stage model could describe the column profiles only qualitatively while the rate-based model was capable in describing the column profiles quantitatively and qualitatively. From simulation results, it can be concluded that the reactive distillation process with the Palm Empty Fruit Bunch catalyst offered advantages over the conventional process because it could eliminate the requirement of post-processing separation and purification at cost-effective column design and operating conditions. The optimum condition for producing biodiesel by reactive distillation using PEFB catalyst was found as follows: 4:1 of methanol to PFAD molar feed ratio, reflux ratio of 1.5, reboiler heat duty of 2.107 kJ/h and 3 reactive stages. This condition provided a FFA conversion of 97 wt% and biodiesel purity of 97.5%.
Acid modified jackfruit wood sawdust as biosorbent for the removal of Fe(II) from aqueous solutions
Authors: Mutiara Tintin , Karisa Primadonna Ciko , Mujahidah Intan
Published: February 2018

The adsorption of Fe(II) from aqueous solutions by acid modified jackfruit wood sawdust biosorbent was investigated in a batch adsorption system. The experiment conducted at room temperature and pH 5 resulted adsorption behaviour of chemical modified Jackfruit wood sawdust biosorbent. The removal of Fe(II) has been found to be the function of initial Fe(II) concentration, acid type and acid concentration. The best removal was at low Fe(II) initial concentration, the higher initial concentration resulted on lower adsorption. Untreated jackfruit wood sawdust has the highest adsorption efficiency, followed by acetic acid, citric acid and tartaric acid modified jackfruit wood sawdust. The maximum uptake capacity of Fe (II) ion was 1.05 mg/g by untreated jackfruit wood sawdust.
Comparison of Nannochloropsis sp. cells disruption between hydrodynamic cavitation and conventional extraction
Authors: Setyawan Martomo , Mulyono Panut , Sutijan  , Budiman Arief
Published: February 2018

Biodiesel production from microalgae is one of the solution of the future energy problem, but its production cost is still high. One of the costly stages of this process is the lipid extraction process. It can be reduced by microalgae cell disruption. One of the mechanical method to cell disruption with the lowest energy requirement is hydrodynamic cavitation. This aim of this study is to evaluate the distribution coefficient and the mass transfer coefficient value of lipid extraction of Nannochloropsis sp. assisted by hydrodynamic cavitation and compare with conventional extraction. The hydrodynamic cavitation extraction was done at 34 °C, 1 atm. The conventional extraction was done at 34 °C, 1 atm with stirring speed 260 and 1000 rpm. The experimental result shows that the distribution coefficient dependent on the temperature with the values for 50, 44, 38 and 34 °C were 0.502, 0.394, 0.349, and 0.314 respectively. And it was according to Van’ Hoff equation with the values of ΔH° was 20.718 kJ/mol and ΔS° was 58.05 J/mol/K. The hydrodynamic cavitation extraction was faster than conventional. The mass transfer coefficient values for hydrodynamic cavitation, conventional 260 rpm and 1000 rpm were 7.373, 0.534 and 0.121 1/s respectively.
Characteristic of ascorbic acid in crosslinked chitosan edible film as drug delivery system membrane
Authors: Kistriyani Lilis , Sulistyawan Wahyu , Kesuma Sapta Hadi
Published: February 2018

Chitosan is a polysaccharide compound in the form of a linear polysaccharide consisting of N-acetyl glucosamine (GlcNAc) and D-glucosamine (GlcN) monomer, which is a derivative of deacetylization of chitin polymer. Chitin is one of common type of polysaccharide on earth after the excess cellulose from inveterbrata skeletons. Chitosan has anti-microbial properties. Based on this properties, chitosan is potentially used to be an edible film as drug delivery system membrane. Edible film was made by dissolving chitosan in 100 mL acetic acid 1%, then the plasticizer and crosslinker was added while heated at 60° C. It was molded and dried in oven at 50°C for 48 hours. Drug loading in the edible film could be controlled by remodeling membrane characteristics in the presence of crosslinker additions. The purpose of this study was to estimate the mass transfer coefficient (kCa) of drug loading in various concentrations of ascorbic acid in the edible film. The characteristics of ascorbic acid in chitosan edible film could be seen from the number of drugs that could be loaded through the uv-vis spectrophotometric analysis. The higher concentration of ascorbic acid was added, the drug would be loaded more into edible film.
Biodegradation of sulphide in biogas by biofilm on salak fruit seeds: The effect of intra-film-gradient
Authors: Lestari Retno A.S. , Sediawan Wahyudi B. , Sarto
Published: February 2018

Elimination of H2S in biogas was performed by bio-filtration, in which H2S degrading bacteria immobilized on the packing material inside a column. Bacteria was taken from the local area, while salak fruit seed was used as packing material because it has a quite large carbon content, porous and has a high water absorption capability. To obtain a quantitative description of the process, which is useful in the design of large-scale bio-filters, two kinetics models were proposed. Model 1 assumes intra-film gradient does not exist and the gas phase is quasi-steady-state. Model 2 assumes intra-film gradient exists and the gas phase is quasi-steady-state. Comparison of the calculation results using the two models to the experimental data suggested the use of model 2. This conclusion is based on both the trend and the accuracy. The trend of model 1 is more conceivable. However, for rough calculation, model 1 could be used for the reason that it is simpler than model 2. The average absolute errors of model 1 and 2 are comparable, approximately 6 ppm. It can also be concluded that intra-film gradient significantly affects the overall rate processes, while the gas phase can be assumed to be quasi-steady-state.
Sulphide removal from liquid using biofilm on packed bed of salak fruit seeds
Authors: Lestari Retno A.S. , Sediawan Wahyudi B. , Sarto
Published: February 2018

2This study focused on the removal of sulphide from liquid solution using biofilm on packed bed of salak fruit seeds. Bio-filter operation of 444 hours consists of 6 phases of operation. Each phase lasted for approximately 72 hours to 82 hours and run at various inlet concentration and flow rate. The highest removal efficiency is 92.01%, at the end of phase 7 at the inlet concentration of 60 ppm and the flow rate of 30 mL min-1. Mathematic model of sulphide removal was proposed to describe the operation of bio-filter. The model proposed can be applied to describe the removal of sulphide liquid using bio-filter in packed bed. The simulation results the value of the parameters in process. The value of the rate maximum specific growth is 4.15E-8 s-1, Saturation constant is 9.1E-8 g cm-3, mass transfer coefficient of liquid is 0.5 cm s-1, Henry’s constant is 0.007, and mass of microorganisms growth to mass of sulphide consumed is 30. The value of the rate maximum specific growth in early process is 0.00000004 s-1.
Preparation of porous carbon as ethylene adsorbent by pyrolysis of extraction waste Mangosteen rinds
Authors: Mukti Nur Indah Fajar , Prasetyo Imam , Mindaryani Aswati , Septarini Shofwatunnida’
Published: February 2018

Mangosteen rind is an important source of natural antioxidants. Due to the growing interest in extracting this anti cancer substances from the Mangosteen rind, the amount of this lignocellulosic residu has been generated significantly as byproduct. In this research, extraction-waste Mangosteen rind (EMP) was used as alternative precusor for production of carbon-based adsorbent for ethylene removal. Steam was used as activating agent and the effect of carbonization time and temperature on the development of pore structure were examined. Pyrolysis process was carried out by heating the Mangosteen rinds powder (180 μm - 355 μm) from ambient temperature up to carbonization temperature of 848 K and kept for 3 hours then followed by heating up to 1123 K and kept for 15 minutes under flowing N2 and steam. This process was repeated for several pyrolysis temperature (1053 K, 1073 K, 1083 K and 1103 K) and carbonization time (0 hours, 1 hour, 2 hours, and 3,5 hours). The carbon obtained was characterized in terms of its pore structure and ethylene uptake capacity. The results show that porous carbon obtained from pyrolysis of extraction-waste Mangosteen rind can be characterized as mesoporous carbon. The highest surface area of 1080 m2/g was obtained from pyrolysis of extraction-waste Mangosteen rinds with carbonization time of 3.5 hours and pyrolysis temperature of 1123 K. Furthermore, the mesopore portion and the specific surface area increased with the increasing carbonization time. From the ethylene uptake experiment, it was noted that the ethylene adsorption capacity of EMPC is 40.12 cm3/g.
Improving public library service quality in local city of Indonesia
Authors: Fithri Prima , Adnan Afri , Syahmer Verra
Published: February 2018

The purpose of this study is to investigate the gap between perceptions and expectations of users on the services of West Sumatera Province Library as a public sector and determine the priority level of the requirements for the library in order to improve the quality of services based on the dimensions of the service quality. This was done using Servqual and Quality Function Deployment (QFD) method. It was found that, from overall attributes, only one attribute fulfills users’ expectations (it has a positive gap), tangibles element for the attribute of cool air circulation. The ranking of the gap, for all dimensions, is the dimension of responsiveness, assurance, empathy, tangibles and reliability. It indicates that users’s expectations were not being fulfilled yet. The main benefit of this research is to understand user’s perceptions and expectations towards the services provided and to obtain the improvement priority to be taken by the West Sumatera Province Library.
Multi period pricing for managing local fruit supply chain
Authors: Widodo Erwin , Prihadianto Rahaditya Dimas , Hartanto Dody
Published: February 2018

Recently fresh fruit sector is grown not only due to increasing of demand that spirited by healthy lifestyle but also requirement of quality food should be eaten daily. Its complexity make many research considered fruit in certain supply chain, called as Fruit Supply Chain (FSC). In FSC, customers tend to purchase products with a longer remaining lifetime and avoid the ones which give aging signal. Customer willingness to pay decreases once the product start to be deteriorated, which may cause slower demand for aging fruits. Consequently, retailers should enable discounted price for aging fruits products to retain or improve demand rate. Main purpose of this research is explaining how to maximize supply chain profit by applying dynamic pricing. A set of mathematical model is optimized on this research. It addresses dynamic pricing for FSC players to achieve better profitability. The result proves that dynamic pricing is urgent to be done which is signaled by increment of FSC Profit. FSC players can separate selling period into three periods, which are forward buying period, normal price period, and markdown price period as implementation of this scheme.
Interpretive structural modeling for technology-related barriers to energy efficiency improvement in Indonesia steel industry
Authors: Soepardi Apriani , Pratikto  , Santoso Purnomo Budi , Tama Ishardita Pambudi
Published: February 2018

This paper investigates the existence of the barriers in Indonesia steel industry, namely: existing technologies were still considered efficient, new technologies not available, new technology not adequate or inappropriate at the site, the energy efficient technology not compatible with other elements of the plant, the uncertainty about future technology standards, lack of technical skills, technology installation period was too long, and poor information quality regarding access to new energy efficient technology. Five practitioners from the national steel industry were retrieved to identify and analyze critical elements and the causal interrelationships among the technology-related barriers. Finally, using the approach of interpretive structural modelling, the barriers were clustered in accordance with their driving power and dependence power. Lack of reliable information access about new technologies is the only barriers at the bottom level of the hierarchy, implying higher driving power. It is also observed that the availability of new technologies, existing technology still efficient, and the uncertainty about future technology standardization have a weak dependent on the other constructs but strongly driver. The four remaining constructs are identified as dependent obstacles. It means that these barriers are the automatic followers of other impediments. The result of this model will assist managers to understand the relative importance and the interdependencies among the barriers. It can guide them to resolve these barriers.
Determining key performance indicators for warehouse performance measurement – a case study in construction materials warehouse
Authors: Kusrini Elisa , Novendri Fadrizal , Helia Vembri Noor
Published: February 2018

Warehouse performance measurement is needed to improve performance of logistics system. In order to improve warehouse performance, it is necessary to identify Key Performance Indicator (KPI). Different warehouses have different KPI, therefore this research aims to identify the most important KPI of warehouse so that warehouse manager can determine corrective actions in their warehouse efficiently and effectively. In this research, 25 KPI of warehouse are identified in five warehouse activities based on Frazelle model. The most important KPI are then determined in each warehouse activity using Analytical Hierarchy Process (AHP). Warehouse performance are measured and final score is determined using SNORM. Improvement steps are proposed base on benchmarking among warehouses. Warehouse performance measurement is conducted in 5 construction’s material warehouses located in Yogyakarta, Indonesia. From this study, it is found that most important KPI for receiving is productivity (receive per man-hour), KPI for put away is cycle time (put away cycle time), KPI for storage is utilization (% location and cube occupied), KPI for order picking is cycle time (order picking cycle time) and KPI for shipping is productivity (order prepared for shipment per man-hour). Improving warehouse performance could be done by comparing warehouse performance with the best performance among peer group.
Measuring the usability of e-banking in Special Region of Yogyakarta
Authors: Hadyanawati Anindyya Agripina , Apsari Ayudyah Eka , Purnomo Hari
Published: February 2018

Online shopping is become an option because customers do not need to go to the store. Internet banking is a bank facility to help customers in common. This research is aim to know usability aspect of e-commerce banking. Data collection was done by distributing questionnaires in Yogyakarta Special Region. The number of respondents is 140 with the range of age 17-22 years. Anova is used as method research. The results showed that in each group show significantly different. Post hoc analysis explained that learnability and efficiency variable has significantly different, with value p<0,05. The highest average value is in the learnability variable and the lowest is the memorability variable.
Innovative design of ironing board based on Kansei Engineering and usability test
Authors: Zhafira Nadia , Putra Perdana Suteja , Rahmillah Fety Ilma , Sari Amarria Dila
Published: February 2018

Laundry business is popular service business in Indonesia that mostly involve muscle activity for lifting and ironing activity. It causes the worker get muscular fatigue and injury especially for ironing activity that is included in the static and monotonous activity. moreover, existed ironing board design in the market is not easy to be adjusted to standing or sitting position of workers. Hence, this paper aimed to design the innovative and adjustable ironing board to minimize the musculoskeletal complaint. The preliminary study is conducted by NBM questionnaires found that fatigue experienced mostly in the back, right upper arm, and calves. The product designed by Kansei engineering to satisfy consumer's feeling and assessed by USE questionnaire to fulfil consumer's usability. Orthogonal array and conjoint analysis were conducted to incorporate all attribute potentials in developing a new single concept design. Statistical analysis was also done to test the hypothesis. 80 respondents have participated in this study. The result of this study is an innovative design of ironing board which is valid to meet consumers' needs such as comfort, secure, attractive, sturdy, durable and multifunction and practical at 5% of the significant level.
Development of decision support system for employee selection using Adaptive Neuro Fuzzy Inference System
Authors: ‘Azzam Abdullah , Indrawati Sri
Published: February 2018

The number of children day care is increasing from year to year. Children day care is categorized as service industry that help parents in caring and educate children. This type of service industry plays a substitute for the family at certain hours, usually during work hours. The common problems in this industry is related to the employee performance. Most of employees have a less understanding about the whole job. Some employees only perform a routine task, i.e. feeding, cleaning and putting the child to sleep. The role in educating children is not performed as well as possible. Therefore, the employee selection is an important process to solve a children day care problem. An effective decision support system is required to optimize the employee selection process. Adaptive neuro fuzzy inference system (ANFIS) is used to develop the decision support system for employee selection process. The data used to build the system is the historical data of employee selection process in children day care. The data shows the characteristic of job applicant that qualified and not qualified. From that data, the system can perform a learning process and give the right decision. The system is able to provide the right decision with an error of 0,00016249. It means that the decision support system that developed using ANFIS can give the right recommendation for employee selection process.
Work postural analysis and musculoskeletal injury risk in critical working station at XYZ Ceramics Yogyakarta
Authors: Sari Amarria Dila , Anwar Annisa Rahmadani , Suryoputro Muhammad Ragil
Published: February 2018

Companies that have manual work, muscle injury is one of the major health issues that often occur when working. XYZ Ceramics Yogyakarta is still doing work activities involving manual processes and there has been identified that worker posture has the potential to cause injury. From the Nordic Body Map questionnaire, complaint was identified in the back were 88%, the knees were 80%, the upper arm 75%, and the right shoulder by 70% from 15 workers. The Ovako Work Posture Analysis System (OWAS) method is used to evaluate and analyze work attitudes so that improved categories of work methods and recommendations could be obtained. Plan for Identifiering av Belastningsfaktorer (PLIBEL) was used to identify the factors that cause muscle injury or harmful effect. In addition, the Nordic Body Map was applied to determine the critical work station. The purpose of this research is to analyze work posture and description of risk level related to musculoskeletal injury at critical work station. The three highest percentage of risk of muscle injury identified at raw material processing station, based on calculation result of PLIBEL Checklist, were on elbow, forearm, and hand. Based on the assessment of working posture using OWAS, the highest action category is identified in the activity of moving the cart containing the soil to the automatic pest that is the action category of 4, which means that this activity is very dangerous for the musculoskeletal system.
Quantitative analysis on the fluctuation of vegetable price in supermarket
Authors: Miranda Suci , Helia Vembri Noor
Published: February 2018

In this paper we analyze the variables affecting the determination of vegetable sale price in supermarket and investigate each amount considered into the formulation. We use the supermarket pricing strategies literatures, cost management theory, and any information obtained from suppliers and supermarket to investigate the variables influenced the sale price gap between supplier sale price and supermarket sale price. In order to obtain the supermarket sale price, it is required to understand the concept of costs. Supermarket as a merchandising firm has two components of costs called purchase costs and operating expenses which are computed to be Cost of Goods Sold (COGS). We found that supplier sale price is the purchase costs and plays has the main role in determining the supermarket sale price. The operating expenses considered is the holding cost. The vegetable characteristics and consumer behaviour have driven the contribution of amount of variables into the sale price at supermarket. Finally, we present the variables satisfying the vegetable sale price formulation and how they are calculated becoming the supermarket sale price.
Numerical study on the effect of width of single curtain on the performance of Savonius wind turbine
Authors: Yuwono Triyogi , Latip Aip Abdul , Putri Nabila Prastiya , Muhammad Ubaidillah , Mazhilna Erik Noer , Ariyanto Citro , Andaryani Ulfa , Fauzi Anaz
Published: February 2018

This is a preliminary results of the flow around the Savonius wind turbine with installing curtain plate in front of the returning blade turbine. It was investigated numerically in a uniform flow at Reynolds number of 30,000 and 90,000. The velocity vector and pressure distribution around the turbine were simulate by varying the width of curtain plate relative to the diameter of rotor blade (S/D) of = 1.00, 1.02, 1.03, 1.15, 1.41, and 2.00, using STAR CCM++ Software. The k-ɛ realizable as turbulence model was used to visualize the flow phenomena occurred around the turbine, and where in this simulation, the rotor turbine was set static. The results show that it seems the width of the curtain installed in front of the returning blade of the turbine plays an important role in the performance of the turbine. In general, the installing of the curtain in front of the returning blade of the turbine is more effective to improve the turbine performance. This is not necessarily, but depends on the width of the curtain and the number of Reynolds (Re). For the width of the large curtain of S/D = 2 at Re = 90,000, the performance of the turbine is estimated lower than when the turbine without the curtain.
A comparative pressure analysis of air flow between horizontal and V-Tail of UAV MALE of NACA0012H with speed variation
Authors: Riza Rahmat , Kurniawan Dicky , Wicaksono Arif Budi
Published: February 2018

NACA0012H is an airfoil type that could be used for Unmanned Aerial Vehicle Medium Altitude Long Endurance. This experiment was used to analyze stress in the surface of Tail of UAV MALE that was caused by air flow. The experiment was conducted using Computational Fluid Dynamics Software. Two designs of tail, horizontal and V-tail, were considered to simulate pressure occurred on the surface of leading edge, chamber and trailing edge. The simulation was developed varying the speed of the UAV MALE. The results showed that pressure occurred on the surface of horizontal tail higher than pressure on the V-tail.
The concept of “Loop Cycle” in landfill management (Case study at Piyungan landfill, Yogyakarta, Indonesia)
Authors: Purnama Putra Hijrah , Damanhuri Enri , Marzuko Akhmad
Published: February 2018

The amount of waste continues to increase from year to year, one of which is due to the population increase. With the target of 100% service level by 2020, Indonesia must prepare the land that will be used as a landfill location in order to accommodate the waste that continues to be produced. Apparently, the problem is not only limited to the provision of land, but operational challenges become more severe. One of its is experienced by Piyungan Landfill, Bantul, Yogyakarta which has been designed to expire by 2015. The government of Yogyakarta is optimizing for landfill can still operate until 2018. One solution that can be given in operation for the loop cycle or closed cycle concepts is landfill mining method, which is utilizing degraded waste into other designations so that the land can still be used to accommodate other waste. Sampling and analysis results show that the waste contained in 1st zone Piyungan landfill aged 15-20 years, with the highest composition is soil (59%) dominate other types of waste. The soil obtained has the potential to be utilized as cover soil and compost, but for compost is necessary to further study the modification of the design of the zoning zone, so that the waste not too long is in the soil so that the nutrient content is still high.
Integration of formal and informal sector (waste bank) in waste management system in Yogyakarta, Indonesia
Authors: Purnama Putra Hijrah , Damanhuri Enri , Sembiring Emenda
Published: February 2018

The change of waste management paradigm becomes an important thing to do, as a step adaptation to the increasing rate of waste generation every year in Indonesia. 100% management target has been divided into two parts, namely the reduction (30%) and waste handling (70%). Reductions focus on source limitation and 3R program optimization, whereas handling involves collecting and final processing activities. However, the current level of waste reduction is still very low (12%), the government made various efforts to increase it, one of its with the waste bank program. DIY province as a pioneer in the concept of waste bank continues to develop to increase the participation of the community, from 166 locations in 2013, increased to 792 locations in 2017 and 495 of its as the waste bank (62.5%). Average waste bank with 43 customers, able to manage the waste up to 2,078,064 kg/month, with the data can be estimated the amount of waste that can be managed in the city of Yogyakarta, Sleman and Bantul Regency. The city of Yogyakarta has 433 units of the waste bank, capable of managing waste up to 899,801.8 kg/month, Sleman Regency has 34 units of the waste bank (78.966,4 kg/month) and Bantul has 24 units of the waste bank (49.873,5 kg/month). The integration of formal and informal sectors through waste banks can increase the percentage of waste management services. The level of service in Yogyakarta City increased from 85% to 95.5%, Sleman District from 30.71 to 31%, and Bantul Regency from 7.49 to 7.7%
Determining e-learning success factor in higher education based on user perspective using Fuzzy AHP
Authors: Anggrainingsih Rini , Umam Muhammad Zuhrul , Setiadi Haryono
Published: February 2018

Recently almost all universities in the world have implemented E-learning to support their academic system. Previous studies have been conducted to determine CSF using Analytic Hierarchy Process (AHP) method. However, AHP method cannot handle the uncertainty and vagueness of the human’s opinion, so then it causes less appropriate decision. Some researcher has proposed to use fuzzy sets theory with AHP to increase the ability of AHP to deal problem regarding the uncertainty/fuzziness. This study aims to determine ranks of priorities of the multiple factors which influence the E-learning success using FAHP method. The respondents consist of ten e-learning’s experts, 305 lecturers, and 4195 students at Sebelas Maret University. The result describes similar success factors ranking between both experienced and non-experienced user (lecturer and student). Then, the result shows that there are five most influencial success factors of e-learning at Sebelas Maret University based on the lectures perspective Financial Policy, Regulatory Policy, Course quality, Relevant Content and Technical Support. On the other hand, according to the student's point of view five most e-learning, critical success factors are Quality of Course, Relevant of Content, Completeness of Content, Attitudes toward Student, and Flexibility in taking Course. Therefore, this finding can be used by E-learning management of Sebelas Maret University to deteremine a strategy to to achieve successful implementation of e-learning at Sebelas Maret University with consider these factors.
Antiproliferative activity of natural coumarins from Calophyllum incrasaptum M.R Henderson-Wyatt Smith against human breast cancer cells MCF
Authors: Abbas Jamilah , Z Udin Linar , Hanafi Muhammad
Published: February 2018

Objective: to evaluated the antiproliferative activity of natural coumarin from Calophyllum incrasaptum M.R Henderson-Wytt Smith against human breast cancer cells MCF-7. Methode : Coumarin from ethyl acetate fraction of C. incrasaptum M.R Henderson-Wyatt Smith was isolated by coloumn chromatographyic and structure elucidated by using spectroscopic methods and isolate compound was evaluated for their antiproliferative activities in the alamar blue assay. Result: Coumarin have antiproliferative activity against MCF-7 cancer cell lines through alamar blue assay for 4 h after treatment. Conclusions: coumarin showed good activity against cancer cell lines with IC50 value of 2.23 μg/mL.
Perspectives of the Tooth Restoration Technology Based on the Computed Tomography Data
Authors: Putrik Maxim , Ivanov Vladimir , Antsygin Igor
Published: February 2018

The aim of the study is to create an image processing system, which allows dentists to create tooth surface automatically. X-rays images of jaws from the cone beam tomography or the spiral computed tomography and images from the micro-computed tomography are the initial data for processing. Example of using the combination of optical and x-ray images in the dentistry is described. Also, it was shown how to use the microcomputed tomography method to plan the placement of orthopedic structures on the lost teeth sites.
The Fluxgate Magnetometer Simulation in Comsol Multiphysics
Authors: Kolomeytsev Andrey , Baranov Pavel , Zatonov Ivan
Published: February 2018

This article describes the fluxgate magnetometer simulation in Comsol Multiphysics software package. The simulation results coincide with the experiment described earlier. Decomposition of the output signal by the Fourier coefficients shows a frequency doubling.
Intellectual Multi-Level System for Neuro-Fuzzy and Cognitive Analysis and Forecast of Scientific-Technological and Innovative Development
Authors: Gorbachev Sergey
Published: February 2018

The article is devoted to description of structure and operation algorithms of a multilevel intellectual system for analysis and forecast of scientific-technological and innovative development of objects and territories based on expert methods, trainable models of fuzzy logic and fuzzy cognitive analysis. The article analyses distinctions and advantages of the system in making forecast evaluation and scenarios of the dynamics of multidimensional feature objects and processes. The authors have built a neutrosophic cognitive map for interaction of technologies based on the results of foresight studies.
Automation of the Design of the Anchorage System Taking into Account the Geomechanical State of the Massif and Mining Development Schemes
Authors: Demin Vladimir , Tomilov Alexander , Sultanova Bakhyt
Published: February 2018

The article presents the system for the automation of the design of the anchorage, which regulates the calculation of the required parameters of the fasteners for the fastening of the fastening system. The main factors affecting the operation of the anchor support are grouped in the following way: mining and geological conditions, technical characteristics of the anchor support, geomechanical conditions for conducting and operating the mine workings. Mining and geological conditions for carrying out excavations include: physical and mechanical properties of rocks, the category of roof stability, fracturing, etc. Technical characteristics of the anchor support: material of the rod, filler, filling completeness, etc. Conditions (geomechanical) of carrying out and exploitation of the mine workings: the depth of the conduct, the location relative to the zone of influence of the cleaning works, the location relative to the waste zone, etc. As a result of calculations the program gives out the basic parameters of the anchor support, which coincide with the parameters adopted by the passport.
Openness of Natural Information Processing Systems and Short-Term and Long-Term Memory
Authors: Shumilov Vladimir , Syryamkin Vladimir
Published: February 2018

In this paper, various types of memory are considered.Development of the nervous system and the brain of organisms ensures expansion of species with more developed brain. Different characteristics of the brain zones have created different conditions for forming traces of events. The various traces of trace events formed in different parts of the brain provided a wider range of functions and brain responses, which contributed to the survival and expansion of species. The work describes the appearance of memory varieties and the causes of these varieties.
Asia Science and Technology Portals
Authors: Solinthone Phonepaseuth , Rumyantseva Tatiana , Phongtraychack Anachack
Published: February 2018

The article presents the information about science and technology portals in Asian countries and their role in dissemination of science and technology-related information. The article describes a new Lao Science and Technology Web Portal launched by the Ministry of Science and Technology of Lao PDR in 2017. The authors analyze goals, content, functions, and benefits of the Lao Science and Technology Web portal as well as problems suppressing its further development.