bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling the mechanical characteristics of tribotechnical composites
Authors: Suvorova T V , Belyak O A , Ivanochkin P G , Danilchenko S A
Published: December 2019

Some aspects of creating composite materials with a modified matrix based on aromatic polyamide phenylone FS-2 are considered. The effective characteristics of the composites are calculated on the basis of the self-consistency method and compared with experimental data obtained by the nanoindentation method. The stress-strain state of the composite during tribological contact was investigated on the basis of the contact problem of the motion
The role of local plastic deformation in the formation of structure and properties of materials under extreme heating
Authors: Brover A V , Brover G I , Moysova O B
Published: December 2019

Based on the physical processes analysis in the areas of pulsed laser applied on metals, the research reveals the peculiarities in self-organization of the structure, which leads to the formation of non-trivial properties of surface layers. Structural features of the hardening process during high-speed laser processing depend on the resulting level of strains in the processing zones, that is, on the ratio of plastic deformation processes during heating under the influence of thermal and phase strains and energy dissipation by polygonization and recrystallization. As a result, the effect of material strengthening is achieved not only by martensitic transformation, microchemical heterogeneity, but also by high-temperature riveting, increasing the density of crystal structure defects, plastic shifts under the strain of different nature.
Conditions and mechanisms of the defects formation in vacuum ion-plasma coatings
Authors: Varavka V N , Kudryakov O V , Zabiyaka I Yu , Shvedchikova O V , Yadrets E A
Published: December 2019

The results of studies of various structural features of vacuum ion-plasma PVD-coatings qualified by the authors as coating defects, are presented. Defects include a large volume of porosity, deformation of crystallites, exfoliation, etc. The systematization of defects is presented, depending on the nature of their nucleation (droplet, substructural, and growth defects) and on the character of their distribution in the coating (regular and stochastic). Coatings of various chemical composition were obtained by the method of ion-plasma deposition using both arc and magnetron evaporators. Experimental results are presented, the main array of which was obtained using a double-beam (ion / electron) electron microscope. A separate study on specific substructural defects was conducted. Statistical data on their geometrical dimensions and distribution in coatings is presented. Defects of this type have micron sizes (up to 5 μm in diameter) and a cylindrical shape with an axis perpendicular to the surface of the coating. A hypothesis about the dislocation mechanism of their nucleation on screw dislocations and the spiral mechanism of their growth has been put forward and substantiated.
Modernized RC4 encryption algorithm
Authors: Semenov V , Makov S , Grinev I
Published: December 2019

A modernized RC4 encryption algorithm with implementation of the resulting algorithm in program for encrypting files is proposed. The program has simple and intuitive interface Testing showed that the modernized encryption algorithm is slower for 4 milliseconds than the standard RC4, which is explained by a more complex key expansion algorithm. Proposed algorithm can replace RC4 without substantial loss in file encryption.
A mathematical model of switched-reluctance motor drive for electrical spindle in synthetic yarn machine
Authors: Kolpakhchyan P , Kochin A , Lobov B , Peregudov O
Published: December 2019

The article deals with the modeling of switched-reluctance drive motor for electrical spindle in synthetic yarn machine. We propose to use the backward differentiation formula to solve a system of algebraic-differential equations that governs electromagnetic processes in switched-reluctance electrical machine. The considered approach allows us to avoid the use of numerical differentiation of current and turning angle dependence of the phase flux linkage. As a result, the mathematical model does not significantly depends on basic data and has good convergence. This article shows the switched-reluctance electrical machine modeling. The use of method proves the correctness of the chosen approach
Probabilistic-entropy approach to ensure the operational reliability of the seaport berth elec-trical contact bollards
Authors: Lobov B , Kolpakhchyan P , Litskevich S
Published: December 2019

Reliability analysis of the gradual failure of high current contacts connecting the con-veying units with the seaport power supply electrical network is largely based on deterministic ideas about their degradation. The use the seaport contact electrical equipment indicates the limitations and inaccuracies of such an approach. The long-term studies show that the high marine humidity, turbulent air moisture with aggressive chemical compounds play a substantial role in the wear and tear of electric contacts of seaport berth electrical bollards. The impact of these factors leads to the occasional wear of electric contacts. Thus, we need adequate mathematical apparatus of probability theory and random processes for the reliable results.
Model and numerical experiment for calculating the theoretical current-voltage characteristic in electro-membrane systems
Authors: Urtenov M Kh , Kovalenko A V , Sukhinov A I , Chubyr N O , Gudza V A
Published: December 2019

This work is devoted to problems of numerical calculation of the theoretical current-voltage characteristics (CVC) and galvanography of electromembrane systems in the potentiometric mode. The purpose of this work is the derivation of the formula for calculating the CVC and galvanography of electromembrane systems in the potentiometric mode, which allows calculating stable relative to random errors and rounding errors in over-limiting current densities. To use the formulas, it is necessary to create a mathematical model for calculating the local current density. In this paper, as this model model is used transport of ions in binary salt in the desalination channel, taking into account electroconvection. The electromembrane systems have been used for water medium preparing in mobile mini systems for generating heat and electrical energy as well as vapour producing. The quality of clean water influences on reliability and life time of these systems, including vapour generator and dam-vapour turbine. The obtained formula in the form of a double integral of the local current density is derived, which allows calculating them steadily with respect to random errors and rounding errors. The formulas allowing considering CVC stably with respect to random errors and rounding errors are obtained, and the physical meaning of these formulas is clarified. The calculation of the theoretical CVC with the use of a mathematical model of ion transfer binary salts given electroconvection and shows that it qualitatively coincides with the experimental current-voltage curves. The quantitative difference can be explained by the fact that the mathematical model does not take into account the reaction of water dissociation / recombination, gravitational convection and other transport mechanisms.
Substantiation of parameters of the heat-shielding product for disabled people by using the system analysis and alternative synthesis
Authors: Babenko L G , Molev M D , Mikhailov A B , Savelyeva N Yu
Published: December 2019

The article deals with topical issues of the development theory of heat-protective clothing for people with limited moving capabilities. In particular, the results of the study based on of the interaction of elements in the dynamic system «man – environment – heat protection product» are presented. The aim of the work was the scientific substantiation of heat-protective clothing parameters by means of using the author’s model of the thermal state of the human lower limbs. The relevance of research work is due to the increased need for special heat-shielding products and insufficient knowledge of thermal processes in space and time. At the same time, the main difference of the proposed methodology is the solution of the problem within the framework of the analysis of the interaction of the human lower limbs and the product. In the process of solving the problem, the analysis of scientific publications and experimental results of the research conducted by the authors was carried out. At the same time to obtain complete and objective information, modern methods of mathematics and prognostics, including system analysis, alternatives synthesis, modeling and mathematical statistics are used. As part of the research work, an algorithm for evaluating the interaction of the elements of the «human – environment – heat-resistant product» system was substantiated and a model for predicting the thermal state of the human lower limbs was developed. As a result, temperature criteria were determined for the package of materials of an adaptation bag for people with limited moving capabilities. Scientific development has got experimental verification, which showed the effectiveness of the idea underlying the design. The obtained results represent a scientifically based and technically feasible method of selecting parameters and materials of a heat-shielding product. The implementation of the outlined development will contribute to improving the life quality of people with disabilities.
Modeling of competition between agents of the same level in a multi-level system with information asymmetry
Authors: Gurtuev A , Dovletmurzaeva M , Chazhaev M
Published: December 2019

We propose a game-theoretic model of resource-based competition between agents of the same level in a multi-level system with information asymmetry. It is shown that under conditions of uncertainty, the optimism of agents leads to non-optimal solutions and an increase in the loss of the total added value in the system due to resource waste. The mechanisms of optimistic shifts in agent estimates and agent’s Bayesian adjustment are described. Equilibrium conditions are obtained in the proposed model.
Some specifics of modeling multi-level agent systems with uncertainty using Groves mechanisms
Authors: Gurtuev A , Dovletmurzaeva M , Yalmaev R
Published: December 2019

Uncertainty is often named among the most significant factors impeding decision making in systems with partially independent agents, both technical and social. Among such systems, multilevel systems can be distinguished as a hard case, as uncertainty problem there is combined with the problem of agent opportunism. A special class of mechanisms — the Groves mechanisms that satisfy the requirements of truthfulness in dominant strategies and efficiency — has been well studied in the literature. The article shows how, under conditions of multilevel multi-agent systems with uncertainty, the implementation of Groves mechanisms can solve the problem of systematic distortion of the agents behaviour.
Development of a new method of management of ergo-technical system on the basis of its dynamics monitoring
Authors: Kramarov S O , Groshev A R , Khramov V V , Belyaev A V
Published: December 2019

This paper explores the state assessment and management of complex human-machine systems that ensure that results are quickly obtained with the desired accuracy. The problem is solved by monitoring the real parameters of the process and comparing them with the results of the simulation, taking into account their fuzziness, incompleteness and lack of definition. The proposed method of solving control problems can be used in a number of subject areas (robotics, aero-space monitoring, etc.).
Geometric conditions of mathematical modeling of human heat exchange processes with the environment for CAD systems creating heat-shielding clothing
Authors: Cherunova I , Tashpulatov S , Davydova Yu
Published: December 2019

In the article research results are presented, which aim to provide of automation algorithm mathematical model of designing technology clothing of the cold protection. The method of calculating heat transfer in the "human - environment" system takes into account the variable thermal parameters and the geometric dimensions of the elements, the presence of internal heat sources and convective heat transfer with the heat-carrier flow along the layers and between the calculated elements . Then the problem is reduced to a one-dimensional heat conduction problem with a variable thermal conductivity coefficient. When modeling a human body, we assume that each element of the model is represented as a set of elliptical cylinders forming the inner layers. Four main concepts of the geometric representation of the outer and inner solutions of the human body model have been developed to simulate the problems of human heat exchange with the environment. An algorithm is proposed for determining the type and structure of a mathematical model for use in CAD systems of protective clothing designing. The research was made in Don State Technical University within the framework of State Assignment of the Ministry of education and science of Russia under the project 11.9194.2017/BCh.
Multi-View Images Fusion Model
Authors: Zhdanova M M , Voronin V V , Sizyakin R A , Minkin M S , Zelensky A A
Published: December 2019

The tasks of recognition actions and classification objects are fundamental in computer vision systems. Even subtasks, such as recognition of atomic motion and single objects form the basis for understanding the situation in the work area and the scene in general. This is especially important in video surveillance systems designed to ensure security. Thus, the effectiveness of recognition and classification methods is one of the primary tasks of computer vision. But the visual methods implemented in similar video surveillance systems, encounter some difficulties, such as inhomogeneous background, uncontrolled operating environments, irregular illumination, etc. To address these drawbacks, the paper presents a model for combining visible range images and depth images. This model allows to improve the quality of recognized images, provides the construction of a more informative descriptor, which also positively affects the recognition efficiency. Our results show that it has good performance in fusion visible image and depth map.
Mathematical Modeling of the Image Processing in Television Systems
Authors: Bezuglov D A , Voronin V V
Published: December 2019

Modern vision systems include a television image processing system. Improving the technical characteristics and expanding the capabilities of modern devices for recording television images makes it necessary to develop and create highly efficient algorithms for processing television images. Such systems process large amounts of information, therefore, the requirements for the reliability of processing large amounts of data at limited time intervals are constantly increasing. The rapid development of high-performance computing systems has recently created the conditions for expanding the range of tasks that can be solved with the help of vision systems. The research for improving the efficiency of methods and algorithms for digital image processing significant. Currently, the processing of television images is divided into several steps. The first step is the formation of a digital representation of the image (discretization, quantization and input of the image into the computer memory). The second step is the pre-processing of images (restoration and filtering). The third step is the formation of a graphic preparation of the image (segmentation and contour detection). One of the most complex and relevant is the scientific and technical task of the contour detections of objects in television images on the background with additive noise. The purpose of this study is the development of the contour detection method on the image with impulse noise using mathematical modeling.
Solving the problem transform of size images on series base points found on frames in the problem of stitching images
Authors: Semenishchev E , Shraifel I , Voronin V , Nadykto A , Marchuk V
Published: December 2019

Stitching several images into a single content is an important task for many areas, including video analytics, machine vision, security, etc. The operation of combining is based on the solution of a number of operations related to the allocation of local features, the selection of transformation matrices of objects, changing the scale and saturation of the image. The process fixing frames is he’s with a number of difficulties, includes the appearance of a noise component in the image, blurring, various non-linear effects of the optical system, as well as problems associated with incorrect operation of data preprocessing software. To select the key points used as alignment points is a complex problem, the solution of which is the subject of many works. However, the transformation of coordinate systems of images with combination frames is a difficult problem, since the system is nonlinear.

The article discusses the solution to the problem of changing the position of points in clusters, under conditions of their nonlinearity. The method and algorithm that implements the procedure of nonlinear transformations size over the entire image is presented. Operations include vector analysis, as well as the results of changing the scale of a group of pixels. The set of test data shows the possibility of applying these approaches to change one of the images according to the specified combination points by the operators.
Ways to optimize the prediction of vascular events in patients with acute coronary syndrome and atherosclerotic lesions of the renal arteries
Authors: Kobzeva N , Terentev V , Zolotuhina I
Published: December 2019

Using the logistic regression equations obtained during the work, forecast tables were developed to assess the risk of developing vascular events in the long term. The proposed forecasting model is an independent method for assessing the risk of fatal and non-fatal vascular events. The consistency of the model has a scientific and practical justification. The proposed original risk model can be used in a comprehensive examination of patients with acute coronary syndrome and atherosclerotic lesions of the renal arteries.
The use of blockchain to support sustainable supply chain strategy
Authors: Parung J
Published: December 2019

This paper aims to identify, and analyze how the use of blockchains technology can support sustainable supply chain management strategies. This support is seen from environmental, economic, and social aspects. In addition, it explains the various advantages of using Blokchain technology to reduce the use of transportation and other resources that have the potential to damage the environment. From an economic aspect, this technology has the potential to increase the efficiency of cost and time. Blockchain technology also has the potential to provide social benefits for the companies involved because of the increasingly good reputation of the organization. Three examples of implementation of the blockchain in three different industries are also provided in this paper. This paper also points out the potential disadvantages of using this technology for supply chains that can threaten supply chain sustainability.
Xylanase production from combined Reutealis trisperma with potato dextrose broth by Tricodherma reesei: the effect of pretreatment
Authors: Agustin Y E , Riadi L , Utami T P
Published: December 2019

Xylanase is an important enzyme in pulp and paper, food, feed, and textile industries. It is produced by fermentation process with Tricodherma reesei as fungi, which grows on several carbon sources such as cellulose and xylan. Reutealis trisperma (kemiri sunan) have been used for biodiesel production after being mechanically pressed. The solid waste, which is called Reutealis trisperma cake (RTC) contains carbon and nitrogen sources which are valuable to be used for xylanase production by T. reesei. Shake flask systems were used to grow T. reesei in medium consists of RTC and Potato Dextrose Broth (PDB). The systems were maintained at 28°C, 200 rpm at initial pH of 6.0 for 84 hours. Two forms RTC used in this study were natural and alkaline pretreated. The RTC fermentations were performed for different concentration of PDB (15g/L and 20 g/L) and also for different concentration of RTC (13.33 g/L; 16.67 g/L and 20 g/L). Pretreated systems gave better yield of xylanase production compared to natural systems. Higher concentration of PDB for pretreated system was found to yield lower xylanase production. The highest xylanase activity (198.1 U/mL) was obtained in media containing 15 g/L PDB and 20 g/L pretreated RTC.
The solubility correlation of azobenzene derivatives in supercritical carbon dioxide: a short review
Authors: Alwi R S , Iryani A S
Published: December 2019

This short review highlights the solubility and correlation of four azobenzene derivatives, which have similar chemical structures, available in the literature. At the same phase equilibrium (at the temperature of 353.15 K), the solubilities of four azobenzene derivatives in supercritical carbon dioxide followed in the order of Disperse Red 82 > Disperse Red 13 > Disperse Blue 79:1 > Disperse Red 1. Five different kinds of density-based models were used to correlate the solubility data. Moreover, the solubilities of four azobenzene derivatives were also correlated thermodynamically by the model of the regular solution with the Flory–Huggins theory. It was found the Sung-Shim model (four parameters) has the lowest median AARD of 12.02 % of the solubility data over the entire conditions.
Formulation and characterization of chitosan-alginate freeze dried matrices loaded with oleoresin extract of red ginger
Authors: Krisanti E A , Safiya A , Mulia K
Published: December 2019

A simple method of encapsulation of bioactive compounds that does not involve washing, heating, and degradation of active substance is desired. The encapsulation of red ginger oleoresin in the chitosan-alginate matrix was developed using the freeze drying method to achieve higher matrix yield and loading capacity in the matrix. Bioactive substances that are encapsulated in the chitosan-alginate matrix aim to be released in the colon. Oleoresin red ginger extract was obtained from maceration of dried rhizome powder in ethanol. A mixed solution consisting of chitosan, oleoresin extract, Tween 80 as a surfactant and alginate was lyophilized at -50 C at a vacuum pressure of about 20 atm for 48-72 hours. The X-ray diffraction pattern of the formed matrix shows that the crystalline chitosan and alginate peaks disappear in the chitosan-alginate matrix which shows compatibility. In the Infra Red matrix spectrum the interaction between chitosan and alginate in the matrix is shown by the change of peak height at 1520 and 1385 cm−1. Release assay showed that the matrix with a weight ratio of chitosan: alginate of 1: 0.5 slightly released phenolic compounds from oleoresin in the simulated gastric fluid but highly released in the simulated intestinal and colon fluids.
Preparation and characterization of polyvinyl alcohol-chitosan-tripolyphosphate hydrogel for extended release of anti-tuberculosis drugs
Authors: Mulia K , Chadarwati S A , Rahyussalim A J , Krisanti E A
Published: December 2019

Polyvinyl alcohol (PVA)-chitosan-tripolyphosphate hydrogels were prepared using a solvent casting-evaporation method to obtain anti-TB drugs extended release formulations. X-ray diffraction and scanning electron microscope results indicated that chitosan reduced the crystallinity of PVA hydrogels and the polymers formed homogeneous mixtures. The added chitosan reduced the encapsulation efficiency, and, the rate of drug release. The profile release of the four drugs indicated that the formulation of 80% PVA-20% chitosan hydrogel matrix had the highest drug release rate in a short period of time in phosphate buffer solution of pH 7.4. The maximum drug loading efficiency was obtained in a matrix formulation contain only PVA, while the addition of sodium tripolyphosphate increased the drug loading efficiency and also reduced the amount of drug released. The hydrogel matrix formulation of PVA-chitosan-tripolyphosphate showed its potential to be used as an extended delivery system for anti-TB drugs.
Tofu wastewater treatment through a combined process of coagulation-flocculation and ultrafiltration
Authors: Prawati P , Oktariany A , Putri S S , Aditya I , Kartohardjono S
Published: December 2019

Wastewater from tofu industries contain many parameters such as total suspended solid (TSS), total dissolved solid (TDS), turbidity, and chemical oxygen demand (COD). These parameters are present in high amount and can endanger the aquatic environment and also decrease water quality. Several studies have been conducted to reduce these parameters, but still require a longer time which is around 12 to 78 days. This study aims to discuss the processes and methods to reduce TSS, TDS, turbidity, and COD parameters from tofu wastewater. The processes discussed in this study include a combined process of coagulation-flocculation and ultrafiltration (UF). The results of the study show that TSS, turbidity and COD reduced to 60%, 60% and 20%, respectively, in the coagulation-flocculation process, but TDS increased to around 90% because of the neutralization process using Sodium Hydroxide (NaOH) solution. Furthermore, it was shown that the combined process of coagulation-flocculation and UF was able to reduce TSS, turbidity, COD and TDS up to 99%, 99%, 75% and 50%, respectively. All the parameters contained in the water produced from the combined process of coagulation-flocculation and UF was in line with the National Environmental Quality Standard requirements, excluding COD due to the COD content in fresh tofu wastewater is very high.
The integration of social responsibility into business operation: case study of Indonesian manufacturing industry
Authors: Rinawiyanti E D , Huang C , As-Saber S
Published: December 2019

Prior studies argue that CSR should be integrated with business operations to get its benefits. However, the empirical research on how CSR and business operations can be incorporated is still limited. This study aims to investigate how to integrate CSR and business operations and to identify the impact of such integration on company performance. Using a sample of 342 manufacturing companies in Java, Indonesia, PLS-SEM was employed to create a path model depicting the relationships between functional integration and company performance. The results showed that Cost, Quality, Supplier, and Employee, have significant positive relationships on company performance, while Innovation and Customers have no impact on company performance.
Price and inventory policy strategy model in a price sensitive dual channel supply chain structure considering product substitution
Authors: Silitonga R Y H , Christina N
Published: December 2019

Dual channel supply chain structure, which utilizes both online and traditional offline channel, is widely adopted by a lot of companies. The structure offers better market coverage and profitability. Despite the advantages, it also brings some challenges to coordinate the strategy of the channel. This paper proposes a pricing and inventory policy model to achieve better performance of the structure, where a product substitution was introduced in the offline channel. A price sensitive linear demand function was also incorporated in this EOQ model. The model then evaluated by analysing the profit in two scenarios, the Stackelberg Leadership scenario and Total Profit scenario. The results show that the total profit of this structure is higher under Total Profit scenario, in which the supply chain entities make decision simultaneously. The model also shows that the product substitution gives a positive effect to the profit and become a competitive advantage of the offline channel.
Assessing materials from hoarded mobile phones: hidden e-waste subject for reverse logistics
Authors: Siringo R , Herdiyansyah H , Kusumastuti R D , Lucianto A E
Published: December 2019

The advancement of communication technology is shortening the lifetime of mobile phones (MP), resulting in a phenomenal increase in mobile phones waste (MPW). However, instead of recycling their obsolete devices, customers shelved MPW for the personal data stored inside. This study aims to estimate secondary minerals contained in MPW stockpiled by Indonesians. “Consumption and used” method was employed to assess the quantity of MPW generated in this country based on the data of mobile subscribers. Considering that MP life span was around 3 years, and about 38% of obsolete MP were hoarded by their owners, this study revealed that about 339.69 million units of MPW were waiting to enter the reversed logistics. This volume of MPW may generate economic intrinsic at approximately USD 508 million from valuable metals such as 80,949 Kg of silver, 8,873 Kg of gold, and 2,547 Kg of palladium. It implied that hoarding MPW impedes the noble goal of recycling; that is to promote sustainable materials management (SMM) since mining precious metals from e-waste will reduce the demand of virgin minerals directly extracted from nature and reduce the environmental impact. This paper highlighted that it is imperative to develop a sustainable system to support the mineral supply chain.
Green dynamic capability for enhancing green innovations performance in a manufacturing company: a conceptual framework
Authors: Amaranti R , Govindaraju R , Irianto D
Published: December 2019

Green innovation has become a necessity for companies in line with the demands of environmental requirements. Green innovation is the activity of developing a product or process that is carried out by considering environmental aspects (such as energy savings, pollution prevention, waste recycling, reduction of resource consumption) to reduce the impact of industrial activities on the environment. One of the factors associated with green innovation performance is the company’s dynamic capabilities. This paper proposes a conceptual framework that illustrates the role of companies’dynamic green capabilities on the performance of green innovation in manufacturing companies in Indonesia.
The use of consumer behavior to identify the flow mapping of waste cooking oil: A finding from Semarang, Indonesia
Authors: Hartini S , Sari D P , Utami A A
Published: December 2019

Management of waste cooking oil is expected to receive more concern nowadays. As a daily consumed good, cooking oil generates a huge amount of waste. Besides, the potency of WCO to cause environmental damages such as water pollution is also inevitable. Adopting the concept of a circular economy, WCO is actually convertible into other value-added products such as soap or fuel. However, in practice, WCO is at scattered points. This paper identified the flow mapping of WCO in Semarang Indonesia as a baby step before stakeholders arrange the further move. Based on the survey that is conducted to 347 households and 146 culinary enterprises, it is known that 90% of households and 67,6% of culinary enterprises disposed the WCO to drains, land, or trash. There is also a small number of participants who give or sell the WCO to 3rd parties such as garbage collectors, oil collectors, household assistants, relatives, and others. WCO-recycling is only carried out by 0,9% of household and none of culinary enterprises.
Perceived kansei and performance-based usability impact on satisfaction for web-based applications
Authors: Hartono M
Published: December 2019

Kansei Engineering has been applied intensively for product design and development considering the deepest layer of customer needs, known as Kansei, which is related to emotional need or affect. This method has been extended into service design and innovation. It has been shown that Kansei’s impact on customer loyalty is equally important as that of cognition or performance. A recent research in investigating the proportional effect of Kansei and performance on usability measurement for e-services has been conducted. It shows that both Kansei and performance is found to be equally significant as well. Then, a question is raised, whether they are antecedent of customer satisfaction. This study is proposed to investigate both perceived Kansei-based and performance-based usability measures on satisfaction. Both theoretical and practical implication is highly expected due to the growth of more human-computer interaction (HCI) features and services nowadays. A proposed applicative framework followed by an empirical study on how the perceived Kansei and performance-based usability impact on satisfaction for web-based applications is discussed.
Measurement of student satisfaction and loyalty using service quality model for higher education (HedQual) at industrial engineering department University of Pelita Harapan
Authors: Hartono N , Laurence  , Tjahjadhi B F
Published: December 2019

The Department of Industrial Engineering (IE) at Pelita Harapan University (UPH) strives to continually improve the quality of its services. Previous studies were conducted in 2010 and 2015 using service quality model from Parasuraman. IE UPH wants to increase their student satisfaction; therefore, IE UPH needs to measure it with a customized model because of the distinctive nature of the service. This study develops the ServQual Model for IE UPH, which is named HedQual. The HedQual is predicted to have a positive influence on the students’ satisfaction and loyalty. The most important construct of service quality for IE UPH Students was also measured using consensus. Data collection was done using a questionnaire and distributed to all IE UPH students. The model was tested using PLS-SEM (Partial Least Square – Structural Equation Modeling). The final model shows that HedQual consists of Academic and Non-academic. HedQual, Reputation and Learning Outcome have a significant and positive effect on Student Satisfaction. Student Satisfaction has a significant and positive effect on Student Loyalty. The most important service quality for IE student from the consensus calculation is the attitudes and sincere interests of lecturers in helping the students.
Organic-inorganic nanocomposite membranes for molecular separation and bioapplications
Authors: Hou J , Sutrisna P D , Li L , Chen V
Published: December 2019

Novel porous materials like metal organic frameworks have shown good promise in catalysis, separation, sensing and adsorption. Compared with the conventional polymeric membranes, metal organic framework membranes usually exhibit higher separation efficiency. However, there are still many challenges which need to be addressed, like the interfacial compatibility within the mixed matrix membrane, defective engineering and stability of the framework stability. We will discuss our strategies to solve these problems towards better membranes. On top of the conventional separation membranes, metal organic framework materials can be applied to construct the artificial cellular membranes for bioentities and even living cells. The porous crystal provides exoskeleton to protect the soft biomolecules and their combination can enable a series bioapplications like catalysis, drug delivery and drug release.
Tensile Properties of Kenaf Fiber by Alkalinization Treatment: Effect of different concentration
Authors: Ismojo  , Zahidah K A , Yuanita E , Kustiyah E , Chalid M
Published: December 2019

The structure that plays an important role in the mechanical properties of natural fibers that will be used as reinforcement in polymer composites is crystalline cellulose. Chemical treatment is one method that is currently widely used for modifying the chemical composition of natural fibers to obtain fibers with high crystalline cellulose content. In this study, alkali treatment with variations in NaOH concentration was used to modify the surface of kenaf fibers. The effect of alkalinization treatment on the tensile properties of kenaf fibers has been carried out. The fiber is soaked in a sodium hydroxide solution with variations in concentrations of 4, 6, 10 and 15% by weight for 3 hours at room temperature and continued with the washing and drying process. Samples were then tested by tensile testing and characterized by using FTIR and FE-SEM instruments. Tensile testing of untreated and treated fiber is carried out 5 times for each variable. Based on the results of these experiments showed an increase in tensile strength of all treated fibers compared to untreated fibers and the highest maximum tensile strength was obtained from the treatment of alkalinization of fibers at a concentration of 10%. This result was also confirmed by the results of FTIR and FE-SEM characterization which have shown a decrease in amorphous content in kenaf fibers and fibrillated bundle fibers into fiber elements.
The Role of Ergonomics in Suporting Supply Chain Performance in Manufacturing Companies: a Literature review
Authors: Sampouw N , Hartono M
Published: December 2019

Nowadays companies are required to work more productive yet maintain good quality. To increase productivity, company needs a conducive effort to optimize the work system. Supply chain management (SCM) is one form of competitive advantages that is applied to every industrial system. There are many factors which can influence the supply chain performance (SCF).Ergonomics is deemed to be one of significant drivers for SCF. This paper proposes and discusses the concepts related to ergonomics which is considered as macro ergonomics in supply chain system. SCM has been seen as macro ergonomics concerning on organization, people, technology, information and resources. This paper shows the importance of ergonomics at the inbound logistics (includes receiving, storing, inventory control and internal distribution management) and outbound logistics (the activites to get the finished product to customer) which are regarded as the critical supply chain activities. A scientific literature review on ergonomics as a critical determinant for SCF is discussed and provided as a theoretical contribution for further research related to the role of ergonomic to support supply chain performance.
The use of pyrolusite to remove Pb and Cd in aqueous solutions: isotherm and thermodynamic
Authors: Fransiscus Y , Kembie M W B , Tanusaputra N M
Published: December 2019

The utilization of natural material as an adsorbent to eliminate contaminants in the water is of great interest. Natural material can be directly used without further treatment that may lead to higher environmental impact. In this study, pyrolusite which is immensely available in Indonesia, especially in East Nusa Tenggara, was used to adsorb Cadmium (Cd) and Lead (Pb) in a single and simultaneous condition. Several operational parameters such as initial concentration, pH and temperature were applied to elaborate the sorption mechanism and to determine the adsorption capacity. The amount of absorbed Cd and Pb increased at a higher pH and reached the optimum condition at pH 7 for both. The adsorption isotherm for both adsorbates were best modeled following the Langmuir equation, giving an adsorption capacity as high as 108.70 mg/g and 123.45 mg/g for Cd and Pb respectively. Additionally, the thermodynamics data showed that the adsorption process in this study was endothermic process.
Power generation in a plant-microbial fuel cell assembly with graphite and stainless steel electrodes growing Vigna Radiata
Authors: Pamintuan K R S , Sanchez K M
Published: December 2019

Plant-microbial fuel cells (PMFCs) are an interesting renewable energy technology that has the potential to generate clean electricity without competing with agriculture for land space. In this study, the electricity generation potential of mung beans (Vigna radiata) in a PMFC set-up with different electrode materials was explored. Three types of set-ups were prepared with five replicates each: PMFCs with stainless steel electrodes, PMFCs with graphite electrodes, and control pots without electrodes. This experimental set-up allowed for the evaluation of the better electrode material, and whether the PMFC environment harms or benefits the plants. The voltage gathered suggests that the potential difference generated in the PMFCs with differing types of electrodes were statistically the same (α = 0.05). The same can be said for power and power density, although the system with stainless steel electrodes generated more power towards the end of the experiment. It was also evident that PMFCs with stainless steel electrodes experienced prolonged time lags due to the reduced biocompatibility of stainless steel. Polarization studies showed that a single PMFC is capable of generating power densities of 0.35 mW/m2 and 0.12 mW/m2 for stainless steel and graphite systems, respectively. The increased power density of PMFCs with stainless steel indicate the lowering of internal resistance brought by the stainless steel. Plants in the PMFCs set-ups were seen to grow faster, taller, and have higher pod output than those in the control set-up. These results indicate that the PMFC technology can be implemented in agricultural land for the continuous generation of passive electricity while growing food crops, eliminating the competition between energy generation and agriculture.
Gas sensitive properties of ZnO nanorods formed on silicon and glass substrates
Authors: Petrov V V , Starnikova A P , Varzarev Y N , Abdullin K A , Makarenko D P
Published: December 2019

Nanostructured materials based on zinc oxide are being intensively studied, since such materials are used to create energy harvesters, gas sensors, and solar cells. Arrays of nanoscale ZnO nanorods are synthesized on silicon and glass substrates by the hydrothermal method. The formed ZnO nanorods with predominantly vertical orientation have an average transverse size of about 30–40 nm and a length of 500–600 nm. For electrical contact, V-Cu-Ni metallization was deposited over ZnO nanorods. The work investigated the gas-sensitive and electrophysical properties of the formed sensitive elements with respect to carbon monoxide (CO). It is shown that the sensor element based on ZnO nanorods on glass has a 30% higher sensitivity and lower (10 ppm) sensitivity limit than similar structures, but formed on silicon. Peculiarities of the response of gas sensors based on ZnO arrays of nanorods were determined, including the effect of temperature, the rate of gas flow, and the effect of the substrate. A method for measuring gas-sensitive properties has been developed. It is shown that sensors based on such sensor structures can be used as energy-efficient gas sensors, as well as detectors in early fire detection systems, robotic sensor systems, and other modern technologies.
The study of the properties of lead zirconate-titanate films on silicon substrate after halogen lamps rapid thermal annealing
Authors: Petrov V V , Kamentsev A S , Polyakov V V , Varzarev Y N
Published: December 2019

Ferroelectric thin films of lead zirconate titanate (PZT) are important is creation of ferroelectric MEMS, memory devices, sensors of physical quantities and converters energy. The thermal annealing is used to obtain satisfactory electro-physical parameters and optimal crystal structure PZT films. The rapid thermal annealing (RTA) in comparison with isothermal annealing has a possibility of selective annealing of individual layers of the multilayer PZT composition by selecting appropriate temperature and duration of the RTA. The purpose of this work is to study the phase-structural state of PZT films formed by high-frequency reactive plasma sputtering and subjected to rapid thermal annealing by halogen lamps. The PZT thin films with a thickness of 1.0 ± 0.1 µm were deposited by oxygen atmosphere high-frequency reactive plasma sputtering on silicon (100) substrates and silicon substrates with SiO2 on surface. After applying, PZT film underwent RTA at temperatures of 600-800 °C and with speed 60 degrees/s. With X-ray phase analysis, the structure-phase composition of the PZT film is revealed. Besides that, the effect of RTA was investigated using electron microscopy. It is established that temperature change at RTA leads to a qualitative change in the phase-structural state of the PZT films as compared to their initial state. This gives a chance to use RTA in formation of the PZT films with given parameters.
Temperature Dependence of Electrical Properties of ZnO Nanorods Array
Authors: Petrov V V , Varzarev Y N , Abdullin K A
Published: December 2019

Zinc oxide nanostructures (nanotubes, nanorods, nanowhiskers, etc.) are a promising material for various electronics devices for power system and green energy such as piezoelectric energy harvesters and solar cells. Electrical properties of ZnO nanorods grown on a glass substrate by the hydrothermal method in an aqueous solution of zinc nitrate were investigated in this work. The SEM micrograph shows that the grown nanorods are vertically oriented and the XRD pattern confirms its crystallinity with (002) preferred orientation. The temperature dependent resistivity of ZnO nanorods array measured from 300 to 523 K shows variation in resistance from 5·109 Ω to 3·106 W and temperature hysteresis and region with positive temperature coefficient of resistance at the heating that was not observed at cooling. The origin of this behavior is explained with the two competing processes - thermal generation of electrons and oxygen species adsorption on the ZnO surface. Oxygen adsorption leads to decrease in the number of oxygen vacancies that are electron donors, and consequently to a decrease in conductivity of ZnO nanorods. The values of activation energy of conductivity were calculated from the slope of linear regions on the Arrhenius plot which are 0.246, 1.466 and 0.248 eV for the heating curve and 0.650 and 0.315 eV for the cooling curve.
Current Perspectives and Mini Review on Zeolitic Imidazolate Framework-8 (ZIF-8) Membranes on Organic Substrates
Authors: Sutrisna P D , Savitri E , Himma N F , Prasetya N , Wenten I G
Published: December 2019

Zeolitic Imidazolate Framework (ZIF) membranes have been considered as promising membrane for gas separation processes due to their robustness and good separation capabilities. The separation of hydrogen (H2) from larger gases is one of their potential applications. Among the different types of ZIF, ZIF-8 is considered as potential candidates for H2 separation owing to its small aperture size and excellent chemical stability. In recent years, ZIF-8 membranes have been fabricated on both inorganic and polymeric substrates. The fabrication of the ZIF-8 layer on polymeric substrates is more challenging than its inorganic counterpart because of the incompatibility issue between organic substrates and ZIF-8. However, the flexible nature of polymeric substrates offers better mechanical stability at high pressure than inorganic substrates. The purpose of this mini-review is to present the state of the art and challenges of research on ZIF-8 membrane synthesis on different polymeric substrates. These challenges include the formation of cracks and defects due to compatibility issues and membrane stability at different operating conditions. Current research results showed excellent gas separation properties of ZIF-8 membranes on polymeric substrates that can surpass the trade-offline of gas permeability and selectivity.