bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of substrate temperature on morphology and properties of ZnO:In nanocrystalline films grown by PLD
Authors: Geldash A A , Vakulov Z E , Dzhuplin V N , Ageev O A
Published: December 2020

The purpose of this work is to study the formation regularities of ZnO:In nanocrystalline films grown by pulsed laser deposition (PLD) for application as contact layers of photosensitive elements. It was found that increasing in the substrate temperature from 300 °C to 400 °C the films have a continuous granular structure with a grain size of 9±2 nm and 13.5±4.5 nm, respectively. The sample obtained at the substrate temperature of 150 °C is characterized by the presence of whisker-like structures with 200±47 nm long and 12±8 nm wide on the film’s surface. With increasing substrate temperature from 150 °C to 400 °C, the value of resistivity decreases from 9.3·10−1 Ω·cm to 2.9·10−2 Ω·cm, the concentration of current carriers increases from 2.12·1018 cm−3 to 3.5·1019 cm−3, and the mobility of current carriers also increases from 2.51 cm2/(V·s) to 6.17 cm2/(V·s). The results obtained can be used in the development and manufacture of highly efficient photoelectric converters based on hybrid nanostructures.
Fractional circuit model for supercapacitors with polyaniline/carbon nanotube composite-based electrodes
Authors: Yavtushenko I. O. , Sibatov R. T. , Somov A. I. , Makhmud-Akhunov M. Yu.
Published: December 2020

Supercapacitors with polyaniline/multiwalled carbon nanotube (PANI/MWCNT) composite-based electrodes are fabricated and studied. The cases of electrodes with randomly distributed and vertically aligned MWCNTs are considered. The measured discharge curves demonstrate the presence of memory effect in studied devices. The fractional-order equivalent circuit model is proposed to describe the impedance spectra.
Observation of the influence of complex SiC porous buffer layer on properties of GaN/Si(111) heterostructures
Authors: Zolotukhin D , Goloshchapov D , Lenshin A , Mizerov A , Arsentyev V , Seredin P
Published: December 2020

1-μm-thick GaN layers were obtained in one growth procedure on compliant SiC/Si(111) substrates using plasma-assisted molecular beam epitaxy (PA MBE). Si(111) substrates were modified by the atoms substitution technique. Prior to the atoms substitution procedure, on the one substrate, the transition porous Si layer (por-Si) was performed. The GaN layer grown on this substrate revealed better surface morphology and structural quality, less threading dislocation density, and as a result, showed lower free carrier concentration and higher carrier mobility. Moreover, the XRD study revealed less strain level in the GaN layer grown on the por-Si layer.
Catalytic properties of nanostructured nickel-containing pectin biopolymers on a glassy carbon surface
Authors: Kholin K V , Shirobokov V P , Nizameev I R , Minzanova S T , Kadirov M K
Published: December 2020

Searching for new ways of converting carbon dioxide into value-added products, such as fuels, is a relevant task of our time. Electrochemical reduction of carbon dioxide to carbon monoxide, hydrocarbons and alcohols is considered as one of the main approaches in this area. One of the most advanced approaches is the use of coordination polymers for homogeneous and heterogeneous catalysis of carbon dioxide reduction. We obtained coordination pectin biopolymers with different nickel ions contents (PG-NaNi). The structure and composition of the obtained biopolymers were characterized by such physicochemical methods as IR and ICP-AE spectroscopy. Morphology of PG-NaNi on a glassy carbon surface provides very high surface to volume ratio. Cyclic voltammetry on the modified glassy carbon working electrode in water solution saturated with carbon dioxide shows catalytic properties of PG-NaNi for CO2 reduction reaction.
Revealing nucleoplasm mechanics by optical trapping and Brownian motion of nucleolus within mouse GV-oocytes in vivo
Authors: Syrchina M S , Shakhov A M , Aybush A V , Zalessky A D , Nadtochenko V A
Published: December 2020

Optical trapping of nucleoli within nucleoplasm of living oocytes as unique model system provides non-invasive technique for investigation of nuclear environment. We employed methods of active and passive rheology to characterize rheological properties of the nucleoplasm of GV-oocytes (germinal vesicle stage) with main types of chromatin distribution in the nucleus (NSN, SN). By using of single beam optical trap, formed by a tightly focused laser radiation at 790 nm wavelength, we performed subsequent stress-relaxation tests series of nucleoli in various directions and with different amplitudes. Nucleolus of the oocyte was employed as a microprobe due to its large size and spherical shape. The characteristic nucleolus relaxation times were obtained for two types of chromatin distribution, which can subsequently be used to evaluate the viscoelastic properties of the nuclear material within oocytes with different physiological states. Motion activity of nucleoli was also extracted to evaluate local forces, acting within nucleolar environment and facilitating chromatin redistribution.
Multi-electrode silicon microprobes fabrication process for brain-computer interface
Authors: Gusev E Yu , Jityaeva J Y , Malohatko S V , Ageev O A
Published: December 2020

Multi-electrode microprobes fabrication process based on silicon substrate was developed using surface micromachining and anisotropic wet etching. The process flow consists of 20 main operations, including 4 lithography steps using 4 photomasks. The minimum size of the elements is 2 μm. The effect of the solution concentration (from 10 to 40% at 80°C) on the etching rate and surface roughness was studied. The optimal value of solution concentration leading to the formation of surface with the lowest root mean square roughness value was determined. The etching rates of monocrystalline silicon (100) face and silicon oxide were 1.5 μm/min and 10 nm/min, respectively. Rapid thermal annealing at 600 °C for 3 min increased the resistance of silicon oxide to the action of an alkaline solution by 2 times. As a result, the neural probe structure including two microprobes and electrical interface of 10 electrodes was fabricated.
Development of a technology for producing thin-film structures based on TiO2 and ZrO2 oxides by gas thermal oxidation
Authors: Rodionov I , Proskuryakov V , Perinskaya I , Kuts L
Published: December 2020

A new highly efficient method for gas-thermal oxidation of VT6 bioinert titanium alloy with a dosed feed of ultrafine TiO2/ZrO2 particles into the treatment zone has been developed. A physical model for the formation of thin-film oxide heterostructures modified with TiO2/ZrO2 powders has been developed. A set of physicomechanical properties and surface characteristics of oxidized titanium samples was experimentally studied. Electron microscopic studies and microhardness measurements of the synthesized film coatings were performed. A high-tech electric furnace device has been developed for the implementation of gas thermal oxidation with the simultaneous dosed supply of fine powder materials into the working chamber of the furnace.
1.55 µm range edge-emitting laser diodes based on InGaAs/InGaAlAs superlattice and InGaAs quantum wells
Authors: Rochas S S , Novikov I I , Babichev A V , Gladyshev A G , Kolodeznyi E S , Karachinsky L Ya , Bobretsova Yu K , Klimov A A , Shernyakov Yu M , Zhukov A E , Egorov A Yu
Published: December 2020

Two laser heterostructures with active region based on seven InGaAs quantum wells and on InGaAs/InGaAlAs superlattice were grown on InP substrates by molecular beam epitaxy. Both active regions were designed for vertical-cavity surface-emitting lasers of 1535-1565 nm spectral range and had total thickness about 80-90 nm. Characteristics of edge-emitting laser diodes fabricated from grown laser heterostructures were studied and compared.
Investigation of the elimination kinetics of low and middle molecular weight uremic markers during hemodialysis treatment with the optoelectronic multispectral sensor
Authors: Konoplev G A , Stepanova O S , Zemchenkov G A , Korsakov V , Kuznetsov A , Frorip A
Published: December 2020

The elimination kinetics of conventional low-molecular weight uremic markers and advanced glycation end products (AGE products), which are considered as a possible middle molecular weight marker of uraemia in hemodialysis (HD) patients, was investigated by direct ultraviolet (UV) absorption spectroscopy of waste dialysis fluid. Light emitting diodes (LED) were exploited as quasi-monochromatic light sources in the deep UV spectral region for measuring optical transmission at the wavelengths 285 nm (the maximum of uric acid UV absorption) and 365 nm (the maximum of AGE absorption band). Optical absorption of waste dialysate was monitored during multiple HD sessions for a group of patients; the double-pool model of elimination kinetics was used for the curve fitting and approximation. It was revealed that kinetic behaviour of AGE products is almost not different comparing with uric acid and other conventional clinically proved uremic markers.
Drift-diffusion simulation of photodetector with controlled relocation of carrier density peaks
Authors: Pisarenko I V , Ryndin E A , Isakov I D
Published: December 2020

A photodetector with controlled relocation of carrier density peaks is a promising optoelectronic device designed for the operation as a part of on-chip optical interconnections together with a high-speed laser-modulator. Previously, we estimated the back-edge performance of the sensor using a combined quantum-mechanical model that had not taken into account certain physical aspects of charge carrier transport in the device structure. In this paper, we propose a two-dimensional drift-diffusion model allowing for the comprehensive analysis of transients in the photodetector with controlled relocation within the semiclassical approach. To implement the model, we develop a technique of finite difference numerical simulation and applied software. The obtained simulation results enable us to clarify the operation mode and connection principle of the photodetector with controlled relocation and to improve its performance through the formation of special carrier-holding layers.
Analysis of the lasing characteristics of InGaAs/GaAs WGM microlasers
Authors: Kryzhanovskaya N V , Moiseev E I , Zhukov A E , Zubov F I , Kalyuzhnyy N A , Mintairov S A , Guseva Yu A , Tikhomirov V G , Kulagina M M , Kadinskaya S A , Vinogradov A Yu , Maximov M V
Published: December 2020

We present an analysis of spectral and threshold characteristics of InGaAs/GaAs quantum well-dot microdisk laser operated under cw current injection at room temperature without external cooling. The experimental values of the threshold current for the disk and ring microlasers are compared. We observe that the threshold current can be significantly decreased in devices with large diameters (more than 30 μm) by using the ring geometry.
Raman spectroscopy of strained GaP nanowires
Authors: Sharov V A , Bolshakov A D , Fedorov V V , Mukhin I S
Published: December 2020

Strain-induced effects on the optical properties of GaP nanowires (NWs) were investigated with micro-Raman mapping and numerical calculations. Various techniques for achieving high mechanical strains in NWs were studied including NW fixation with metallic contacts created with optical lithography and AFM-based nanomanipulations. Polarization-dependent micro-Raman mapping of highly-strained GaP NW was carried out. The impact of tension and compression strains on the Raman signal of bent NW was separated. Numerical model describing strain-induced behavior of TO Raman mode was introduced.
Silicon nitride Mach-Zehnder interferometer for on-chip quantum random number generation
Authors: Prokhodtsov A , Kovalyuk V , An P , Golikov A , Shakhovoy R , Sharoglazova V , Udaltsov A , Kurochkin Y , Goltsman G
Published: December 2020

In this work, we experimentally studied silicon nitride Mach-Zehnder interferometer (MZI) with two directional couplers and 400 ps optical delay line for telecom wavelength 1550 nm. We achieved the extinction ratio in a range of 0.76-13.86 dB and system coupling losses of 28-44 dB, depending on the parameters of directional couplers. The developed interferometer is promising for the use in a compact random number generator for the needs of a fully integrated quantum cryptography system, where compact design, as well as high generation speed, are needed.
Development of Control Method For An Optimal Quantum Receiver
Authors: Elezov M S , Shcherbatenko M L , Sych D V , Goltsman G N
Published: December 2020

We propose a method for optimal displacement controlling of an optimal quantum receiver for registrations a binary coherent signal. An optimal receiver is able to distinguish between two phase-modulated states of a coherent signal. The optimal receiver controlling method can be used later in practice in various physical implementations of the optimal receiver.
About compensation of radiation - induced losses in optical fibers
Authors: Dmitrieva D S , Pilipova V M , Davydov V V , Valiullin L R
Published: December 2020

In article the necessity of developing a method of the compensation of radiation-inducted losses in the fiber optic communication lines is substantiated. Reasons of appearance of radiation color centers in the optical fibers are considered. A method of increasing the velocity of the relaxation processes after finishing the γ-radiation influence on the fiber optic communication line is developed. The received results are presented.
Optical densitometry method for liver function assessment using indocyanine green
Authors: Kolokolnikov I , Lavrenyuk I , Savchenko E , Nepomnyashchaya E
Published: December 2020

Indocyanine green is a tricarbocyanine dye, that is stable in human blood plasma and can be completely eliminated by liver in several days. Due to its properties it can be used to assess the metabolic liver function. We present optical densitometry device and theory for taking measurements of concentration of indocyanine green in patient’s blood in vivo.
Optimal fiber optic scheme for sub-SQL quantum receiver realization
Authors: Shcherbatenko M , Elezov M , Sych D , Goltsman G N
Published: December 2020

Practical implementation of high-precision quantum measurements is an important problem in modern science. One of the main parts of the quantum receiver is the optical scheme. We developed and tested several optical circuits based on different types of interferometers, namely Sagnac-based scheme, Mach-Zehnder-based scheme, and Michelson-based scheme. All these schemes are assembled with optical fibers and fiber-optic components, since the fiber-optic implementation is closest to application in practical devices. Schemes were evaluated according to two main criteria: extinction and interference stability. On the basis of the obtained data, it can be concluded that the most suitable is the scheme based on the Mach-Zehnder interferometer. In continuous mode, we were able to obtain an interference extinction about 30 dB with acceptable temporal stability.
Nuclear magnetic spectrometer of differential type for determining the longitudinal relaxation time in turbulent fluid flows
Authors: Myazin N S , Davydov V V , Sviatkina V I , Yushkova V V
Published: December 2020

The article substantiates the necessity of measuring the longitudinal relaxation time T

1
of the flowing liquid to control its state. For such measurements, a new method for measuring T

1
in a flowing fluid is proposed. This method allows to measure relaxation time in a wide range of a flow rate (more than two orders of magnitude).
Resonant activation of resistive switching in ZrO2(Y) based memristors
Authors: Baranova V N , Filatov D O , Antonov D A , Antonov I N , Gorshkov O N
Published: December 2020

We report on a comparative study of resistive switching in the memristors based on ZrO2(Y) films and on ZrO2(Y)/Ta2O5 bilayer stacks by triangle voltage pulses with superimposed high-frequency sinusoidal signal. The dependencies of the current difference in the low resistance state and in the high resistance one on the sinusoidal signal frequency for the ZrO2(Y)-based memristor and for the ZrO2(Y)/Ta2O5-stack based one manifested one and two maxima, respectively attributed to the resonant activation of the migration of the oxygen ions via the oxygen vacancies by the alternating external electric field in ZrO2(Y) and in Ta2O5.
An improved design of a seesaw-type MEMS switch for increased contact force
Authors: Marukhin N V , Uvarov I V
Published: December 2020

Microelectromechanical systems (MEMS) switches have a wide range of possible applications due to their promising working characteristics, but commercial success of these devices is limited by low reliability. In contrast with macroscopic electromechanical relays, MEMS switches typically develop a small contact force, which results in unstable and high contact resistance. In this paper we propose the design that ensures several times higher contact force in comparison with previously used structure. Enhancement of the force is achieved without increasing the footprint and operating voltage of the switch. The analytical calculation and finite element simulation of the working characteristics are performed. At the driving voltage of 100 V the modified switch provides the contact force as high as 130 µN, which is an order of magnitude higher than the force developed by the basic device.
Application of developed MIC LNA in microwave radiometry equipment
Authors: Chizhikov S V , Solov’ev Yu V , Gudkov A G
Published: December 2020

The analysis of the developed crystals of MIC LNA of Russian production was carried out. The possibility of their application as an active element base in the development of microwave radiometry equipment was confirmed.
Design and simulation of RF MEMS switch for use in the millimetre wavelength range and SPDT RF MEMS switch
Authors: Lysenko I E , Tkachenko A V , Ezhova O A , Shafrostova S I
Published: December 2020

This article describes in detail the design of a shunt capacitive RF MEMS switch for Ka-frequency band, as well as the design of a single-pole-double-directional RF MEMS switch made on its basis. An electrostatic and electromagnetic analysis was performed using the MATLAB and ANSYS HFSS software package. The switch uses a 1.52 V actuation voltage and 1.3 μs of switching time to move the membrane from the up state to the down state. The operating frequency range of this switch is between 24-34 GHz with isolation of -53 dB at 29 GHz and reflection loss of -0.25 dB for this frequency range. The design of the switch is made on a GaAs substrate with a thickness of 525 μm with a double-sided insulating layer of silicon oxide with a thickness of 2 μm.
Simulation of the action of a three-dimensional nonlinear spiral phase plate in the near diffraction zone
Authors: Khorin PA , Ustinov AV
Published: December 2020

The report investigates the action of a nonlinear spiral phase plate in the near diffraction zone, taking into account the three-dimensional structure of the optical element. Simulation of the diffraction of a Gaussian beam with linear polarization is performed on the basis of the finite difference in the time domain method. Numerical comparison of the action of linear and nonlinear phase plates showed a difference in their action at distancing from the optical element.
Investigation of the influence of the geometric parameters of AFM cantilevers on the resonant frequency of their oscillations
Authors: Panchenko I V , Shandyba N A , Ballouk A , Rodrigues D , Kolomiytsev A S , Ageev O A
Published: December 2020

This paper presents the results of theoretical and experimental studies aimed at studying the influence of the basic geometric parameters of micromechanical cantilevers on the resonant frequency of their oscillations. The dependences of the oscillation frequency on the length of the cantilever beam, obtained based on mathematical modeling are theoretically investigated by the finite element method. In experimental studies that used AFM cantilever beams, the beams were shortened stepwise by the method of local ion beam etching by focused ion beam (FIB) Ga+. After each step, the change in the resonant frequency of oscillations was monitored. It was found that the application of the FIB method allows you to accurately change the geometric parameters of the probe beams, which, in turn, allows you to change the resonant frequency of cantilever oscillations with high accuracy. During the analysis of the obtained dependences of the resonant frequency of oscillations on the geometric parameters of the beams, it was found that a decrease in the length of the cantilever from 110 to 80 μm leads to an approximately twofold increase in the resonant frequency of oscillations of the cantilever from 320 to 620 kHz. The obtained graphs of the theoretical and experimental dependencies are compared, which showed a good correlation of the results.
Research of the mechanical parameters of silicon membranes for acoustic sensors
Authors: Malokhatko S V , Gusev E Yu , Rassolov E A , Khannanov A M , Ageev O A
Published: December 2020

This paper presents the results of modeling and fabrication of silicon membranes for acoustic sensors with resonant frequency from 2 kHz to 60 kHz and pressures from 0.1 to 14 Pa. An analysis of the constructive and mechanical parameters of monocrystalline silicon membranes is performed. The range of membrane edge length (6-20 mm) at a fixed thickness of 50 μm determined. The etching process of a silicon wafer by anisotropic wet etching was studied. A process flow for manufacturing silicon membranes is proposed. The results of experimental studies of amplitude-frequency characteristic of membranes are obtained.
Formation of carbon nanostructures in a high-temperature flame
Authors: Vasilyeva O V , Ksenofontov S I , Lepaev A N
Published: December 2020

Carbon nanostructures in the form of tubes are formed during the heterophase regime of metal combustion with fluoroplastic. These tubes are filled with condensed particles of combustion products and change the optical properties of the flame.
Improving the mechanical resistance of the glass surface for optoelectronic devices by electron beam processing
Authors: Avdeev S P , Gusev E Yu , Ryabova D I
Published: December 2020

The paper considers the issues of hardening the surface of phosphate glasses for optoelectronic devices. The effect of electron-beam processing on the physical-mechanical properties of the glass surface is investigated. It was found that the processing of phosphate glass “SZS23” increases the surface microhardness by 24% owing to removing the damaged layer and changing the elemental composition of the glass surface.
Characteristics of an all-solid-state lithium-ion battery prototype
Authors: Fedorov I S , Mazaletskiy L A , Mironenko A A , Naumov V V , Rudy A S , Tortseva J S
Published: December 2020

The results of the study of the charge-discharge characteristics and impedance of a solid-state lithium-ion battery of the electrochemical system LiV2O5-LiPON-(Si-O-Al) are presented. It is shown that the features of the charge-discharge curevs are associated with a change in the Fermi level of electrode materials due to a change in the lithium concentration. The results of impedance spectroscopy in the ranges of high, medium and low frequencies are presented and equivalent circuits are proposed.
Modelling of normal domain evolution after single-photon absorption of a superconducting strip of micron width
Authors: Dryazgov M , Semenov A , Manova N , Korneeva Yu , Korneev A
Published: December 2020

The present paper describes a modelling of normal domain evolution in superconducting strip of micron width using solving differential equations describing the temperature and current changes. The solving results are compared with experimental data. This comparison demonstrates the high accuracy of the model. In future, it is possible to employ this model for improvement of single photon detector based on micron-scale superconducting strips.
Substrate-dependent degradation of thin TMDC layers in ambient conditions
Authors: Borodin B R , Benimetskiy F A , Alekseev P A
Published: December 2020

In this work, substrate-dependent degradation of thin layers of transition metal dichalcogenides (TMDC) is demonstrated. The energy barrier heights of the MoSe2/Au and MoSe2/Ni heterojunctions were studied using Kelvin probe force microscopy. The effect of the barrier height on the photodegradation process is shown. The results show that the Ni-covered substrate promotes the photodegradation process in the few-layer MoSe2 flake. While the Au-covered substrate depresses it. The results of this work show the importance of choosing a substrate for the stability of devices based on thin MoSe2 layers and might be useful for creating devices based on thin TMDC layers.
Microscopic simulation of e-beam induced PMMA chain scissions with temperature effect
Authors: Sidorov F A , Rogozhin A E
Published: December 2020

This study presents microscopic quantitative model of e-beam induced poly-methylmethacrylate (PMMA) main-chain scissions. Scission processes are supposed to be caused by ester side group elimination, competing with hydrogen abstraction processes. Experimental values of PMMA radiation scission yield at different temperatures were obtained using direct Monte-Carlo algorithm for the simulation of e-beam scattering in PMMA/Si structure and detailed PMMA layer model for the simulation of exposed PMMA molecular weight distribution. The radiation scission yield increase at higher temperatures is associated by the increase of probability of remote PMMA main-chain scission, which follows the ester side group elimination. Temperature dependence of remote scission probability for the temperature range 20-180 °C is determined.
Quantum (matrix) geometry and quasi-coherent states
Authors: Steinacker Harold C
Published: December 2020

A general framework is described which associates geometrical structures to any set of D finite-dimensional Hermitian matrices X

a
, a = 1, …, D. This framework generalizes and systematizes the well-known examples of fuzzy spaces, and allows to extract the underlying classical space without requiring the limit of large matrices or representation theory. The approach is based on the previously introduced concept of quasi-coherent states. In particular, a concept of quantum Kähler geometry arises naturally, which includes the well-known quantized coadjoint orbits such as the fuzzy sphere

S

N

2

and fuzzy

C

P

N

n

. A quantization map for quantum Kähler geometries is established. Some examples of quantum geometries which are not Kähler are identified, including the minimal fuzzy torus.
Efficient energy resolved quantum master equation for transport calculations in large strongly correlated systems
Authors: Dorn Gerhard , Arrigoni Enrico , von der Linden Wolfgang
Published: December 2020

We introduce a systematic approximation for an efficient evaluation of Born–Markov master equations for steady state transport studies in open quantum systems out of equilibrium: the energy resolved master equation approach. The master equation is formulated in the eigenbasis of the open quantum system and build successively by including eigenstates with increasing grandcanonical energies. In order to quantify convergence of the approximate scheme we introduce quality factors to check preservation of trace, positivity and hermiticity. Furthermore, we discuss different types of master equations that go beyond the commonly used secular approximation in order to resolve coherences between quasi-degenerate states. For the discussion of complete positivity we introduce a canonical Redfield–Bloch master equation and compare it to a previously derived master equations in Lindblad form with and without using the secular approximation. The approximate scheme is benchmarked for a six orbital quantum system which shows destructive quantum interference under the application of a bias voltage. The energy resolved master equation approach presented here makes quantum transport calculations in many-body quantum systems numerically accessible also beyond six orbitals with a full Hilbert space of the order of ∼106.
Simulation Analysis of Voltage Distribution of 500kV Degraded Magnetic Insulator String
Authors: Xueming Zhou , Danhui Hu , Zhiqiang Feng , Ding Zhou , Xiaopo Mao
Published: December 2020

Insulators are important power grid equipment and key components to ensure electrical insulation performance. Porcelain insulators with reduced insulation performance are generally low or zero, and are broken down under lightning overvoltage or even normal operating voltage. The thermal effect generated by the strong power frequency fault current flowing through the porcelain insulator will often cause deterioration of the porcelain insulator. The iron cap exploded, causing serious accidents such as stringing of insulators and grounding of wires. If there are continuous multiple pieces of zero-value insulators in the insulator string, the voltage of the insulators around the zero-value insulators will increase compared to normal conditions, and the normal insulators farther from the zero-value insulators will be less affected. If there are multiple consecutive zero-value insulators at different positions in the insulator string, if the number of zero-value insulators in the insulator string is large enough, and the distribution positions are more diffuse, the voltage of the entire string of insulators in the insulator string will be biased as a whole high.
Design Sling Bag Using Kansei Engineering Method
Authors: Fajri Hasibuan Chalis
Published: December 2020

The rapid development of the bag craft business has led to tighter competition. Companies must be able to produce products on the market. Facing business competition. The conditions that occurred in the Sabina collection business showed that in the sale of sling bag models in July 2019 there was still a decline of 12% of total sales. In developing a sling bag product, it is necessary to research the consumer’s desire by using the engineering is a method as a bridge to the desires of consumers towards the desired product design, by defining consumer desires (images) identified through the words Kansei into product design. Then the conjoint analysis is used to get the value of the relationship between the design elements and Kansei word. The results of this study are from the Kansei word questionnaire obtained 7 pairs of Kansei words that represent the right words taking into account the products offered. The results of conjoint analysis based on categories that are closely related to each Kansei word are the design concepts of fabric, rectangular shape, medium size, and color variants.
Comparison and Integration of Axiomatic Design with Quality Function Deployment as a Design Method: a Literature Review
Authors: Fauzi Malik Alfin , Napitupulu Humala L , Ginting Rosnani
Published: December 2020

This paper focus on certain design methods: Axiomatic Design (AD) and its comparisons with Quality Function Deployment (QFD). While there are other methods such as QFD is more suitable for problem identification, AD is more suitable for decision making of product development with high quality needs. The general observations on the similarities and differences among the two design methods based on steps are discussed, contrasting the basic performances of the design method. We can conclude that Axiomatic Design is more suitable for the decision stage on planning phase while QFD is more suitable as a tool of problem inquisition.
Product Development with Quality Function Deployment (QFD) : A Literature Review
Authors: Ginting Rosnani , Ishak Aulia , Fauzi Malik Alfin , Satrio M Riski
Published: December 2020

Quality Function Deployment (QFD) is one method for developing customer-oriented products. QFD is a planning process that helps the organization plan to implement various technical support tools effectively and complement each other to prioritize each problem. House of Quality (HOQ) is a tool from QFD that is used to determine design boundaries, shows the relationship between respondent needs and the matrix to satisfy the needs of respondents and illustrates the focus of the design team to produce quality products. The paper’s purpose is to review the QFD literature based on references that have been collected about the history of the development of the QFD method and the application of QFD in product design and development. Planning for process quality is a very important technique for managing the quality of the product during the product development process. Done to expand processes and adequate process capabilities aimed at producing products. Since Japanese academics and industry began 3 decades more than have passed to formalize QFD techniques in 1960 and 1970. Because of the effectiveness in quality management and product expend, QFD applications have been widely used.
Product Design of Total Dissolved Solid
Authors: Lodewijk Napitupulu Humala , Ginting Rosnani , Kemala Bellina Diah Sri
Published: December 2020

Development of measuring devices total dissolved solid microcontroller-based with several variations of the conductivity sensor has been carried out. In the process of making this TDS product design the technique is first used brainstorming to determine the characteristics of the product to be made, then draw conclusions from the results of brainstorming that has been collected. Then the technique is done sampling by distributing open and closed questionnaires to determine the type of product. After the open and closed questionnaires are finished distributing, then conducted survey is market using a technique sampling, as well as determining the validity and reliability of the main products with products of competitors I, competitors II and competitors III. The steps problem to the sub problems are determined in order to classify the objectives that will be made in the design of the TDS product. Sub problem to sub solutions are carried out to determine the Quality Function Deployment (QFD) Product. The step sub-solution to the solution is determined to generate and evaluate alternatives by the sum of the paired matrices between attributes. Product design uses the nigel cross approach.
Multi-criteria spine layout design of a mixed production line considering additional processes required for a new product
Authors: Arifiyanto Agus , Cakravastia A R Andi , Priyatna Iskandar Bermawi
Published: December 2020

This research is based on a case study of an automotive company with a mixed production line system facing on redesigning layout due to an additional new product in the current facilities for cost improvement. The objective of this research is twofold (i) to fulfil space required for additional machines and (ii) to redesign layout which is the best layout for producing the current and new products. Heuristic approach combining construction and improvement algorithms is used for redesigning a manufacturing mixed production line layout, and this results in four alternative layouts. The four alternative layouts are evaluated comprehensively by using MCDM (Multi Criteria Decision Making) and the multi criteria considered are material handling cost, total re-layout cost, takt time process, numbers of shutdown period for relocation and comply with management policy related with safety. The best layout is the layout fulfilling required space, 1,120 m2 for new processes, and meet with the five criteria considered.
Proposed Improvement of Flour Quality by using New Seven Tools Method (Case Study : XYZ Company)
Authors: Ginting Rosnani , Wibowo Christopher
Published: December 2020

The quality of flour is a matter that must be considered as the main output in the production process, in this case each type of flour has a different standard specification, the quality of the flour is determined by 3 main factors contained in the flour, namely moisture, protein and Ash content. The specifications of the three main factors must be achieved in order to produce quality flour and suitable for use according to the type of flour. Disruption in the production process can cause the quality of a flour not reached / not in accordance with the specifications, things that can cause disruption in the production process can be caused by several factors, namely the quality of raw materials, human factors, machine factors in the production process, work methods and work environment in the production process. So, this research was conducted using the new seven tools method to find out the main causes of quality problems in wheat flour and to find proposals to improve the quality of wheat flour. The application of this method suggests making a monitoring schedule because the main problem found in the field is not monitoring closely.
Improving the Loading and Unloading Process Efficiency with Lean Manufacturing Approach using Value Stream Mapping in Jakarta Container Yard
Authors: Fathurrahman K. , Hakim I. M.
Published: December 2020

Facilities and infrastructure of maritime logistics activities such as ports, vessels, and containers are important indicators for developing national export-import activities. Maritime Logistics activities in container terminals has a big problem of dwelling time while apparently there are also bigger problems in Container yards. This leads to process and time efficiency problem. Container utilization can be improved in the loading and unloading process at Container Terminals and Container Yards. The Loading and Unloading processes at container yards happen to be the longest duration of all logistics activities. Therefore, increased loading and unloading efficiency at container yards are needed as an effort to increase export-import activities. The study was conducted by observing the loading (lift-on) and unloading (lift-off) process flow to identify waste using the Value Stream Mapping (VSM) method. Waste of Waiting is identified both in Loading and Unloading processes. VSM design results in an increased level of efficiency up to 84.89% for the unloading process and 80.51% for the loading process. The VSM method is needed as waste identification and efficiency improvement efforts for container service in Jakarta container depot. The VSM method is needed as waste identification and efficiency improvement efforts for container service in Jakarta container yard.
Risk and reliability analysis on critical components of boiler in steam power plant
Authors: Pamungkas I , Irawan HT , Fitriadi  , Saputra A
Published: December 2020

This paper uses the failure mode and effect analysis (FMEA) approach to conduct a risk analysis, and the reliability approach to determine the level of reliability of critical components of boiler sections in steam power plants. The critical components of the boiler will be identified failure modes, causes of failures and effects of failures, and then assess the severity, occurrence and detection to get a risk priority number (RPN). The critical boiler component with the highest risk is calculated for reliability. The results of this paper show the highest risk found in the four critical components of the boiler, namely cyclone separators, primary air fan (PA fan), coal feeder, and induced draft fan (ID fan). While the reliability calculation results of the four components, the average reliability value obtained is below fifty percent, or including low. The results of risk and reliability analysis that recommend to minimize risk and improve the reliability of critical components in the boiler using diagnostic methods, conducting preventive controls, using visual management techniques, using sensors to distinguish failures, and carrying out preventive and scheduled maintenance to prevent unexpected outages in the generating system.
Analysis of Quality Level of Outpatients in Puskesmas Baktiya Using Fuzzy-Servqual Method (Service Quality)
Authors: Bakhtiar  , Zakaria Muhammad , Anshar Khairul , Wahyuni Fitri
Published: December 2020

Puskesmas Baktiya is a company engaged in central of public health service services related to the patient. Thus it is necessary to improve the quality of services provided so that customers feel comfortable and satisfied, and need a method to measure the quality of Pusksmas Baktiya. The data collection steps were conducted by observing and distributing questionnaires from several criteria. The criteria are obtained through interviews and literature study. The method used to measure the quality of service using Fuzzy-Servqual. The research instrument used questionnaires with a total sample of 40 respondents, ie outpatients Puskesmas Baktiya. The results of data processing, obtained that the value of fuzzy-servqual per criteria as a whol has a low value so that Puskesmas Baktiya needs to make improvements. It also shows that customer expectations are not yet in line with the perceptions of the services they receive. With these results the management of Puskesmas Baktiya need to immediately improve the quality of service to attract patients. Patient waiting time for service to doctor’s office (after registration) and patient waiting time for drug taking (after service in check room).
Effect of K-Silica heterogeneous catalyst in transesterification reaction of crude palm oil
Authors: Manurung Renita , Syahputri Zuhri Ruri Rizki , Siregar Halimahtussa’diah , Agustan Siregar Alwi Gery
Published: December 2020

Crude Palm Oil (CPO) is a raw material form of vegetable oil that cannot be consumed anymore and where the availability is very large. The purpose of this study was to observe the use of crude palm oil in the manufacturing of biodiesel by using a catalyst of bamboo ash leaves catalyst impregnated with KOH to get in the best yield of various reaction variables performed. The transesterification process reacted oil and methanol to produce methyl esters and glycerol. The methyl ester was produced at the top layer and it was separated from the glycerol and then washed. The effects of various process variables such as the type of the catalyst, the amount of catalyst, and time of reaction were observed in this experiment. The properties of biodiesel such as ester content, density, and kinematic viscosity, were evaluated and compared with Standard Nasional Indonesia (SNI). Under the best conditions, the maximum yield of biodiesel was 92.58% and 99.76% FAME methyl ester was 99.76% obtained using a molar ratio of oil: methanol of 1: 9 at 65°C with a reaction time of 2 hours and 4% catalyst. The results obtained in this study indicated that the K-Silica catalyst of KOH impregnated ash bamboo leaves is suitable as a catalyst to produce biodiesel.
Silica-loaded styrene-butadiene rubber in the incorporation of stearamide: The torque properties
Authors: Dhoni R , Ginting M , Surya I
Published: December 2020

This research-study investigated the effects of stearamide on the torque properties of silica-loaded styrene-butadiene rubber (SBR). The SBR was loaded with silica at a settled dose (thirty phr) and the stearamide was mixed into the silica-loaded SBR compounds with varied doses from two to eight phr. The effects of stearamide additions on the maximal torque, minimal torque and torque change of silica-loaded SBR were investigated. It was observed that the stearamide caused some affection in torque properties of the silica-loaded SBR. The stearamide diminished the minimal torque but raised the maximal torque and torque change. The bigger the stearamide doses caused in the lower was the minimal torque but caused in the higher was the torque change. The enhancement in torque was attributed to the role of stearamide as the supplementary plasticizing agent for the silica-loaded SBR compounds. The oily property of stearamide decreased the viscosity and enhanced rubber to filler interaction or crosslinks level, respectively.
Ergonomic Research Trends in the Health
Authors: Panjaitan N , Ali A Y B , Samat H A
Published: December 2020

The Ministry of Health (Kemenkes) in March 2019 released the number of hospitals in Indonesia, the number of hospitals released is 2813, the province with the highest number of hospitals in East Java and followed by West Java in the 2nd rank. The number of hospitals approaching the number 3000 indicates that there is an increasing number of patients each year, with the number of hospitals increasing each year, so hospital management is a very important factor for attention in improving hospital management especially in the area of ergonomics. Ergonomic research over the last 10 years has been in the health field of 62. The research includes macros ergonomics, meso ergonomics and micro ergonomics. Meso research ergonomics with the least amount of just 1 study in the last 10 years, 31 macro studies ergonomics and 30 micro-ergonomic studies. Ergonomic research in most health fields was conducted in 2015. The number of hospitals steadily increasing over the years should be followed by an increasing number of studies ergonomics in the field of health especially in hospitals.
Measuring the Situational Awareness when Driving on Online Motorcycle Taxi Drivers in an Efforts to Reduce Work Accidents Using the QUASA Method
Authors: Buchari  , Lawrena Sianturi Dian
Published: December 2020

The increasing demand for online motorcycle taxi services has been followed by an increase in traffic accidents. According to data from the Indonesian National Police, an average of 3 people die every hour due to traffic accidents and 61% of these accidents are caused by human factors such as the ability and character of the driver. Seeing the many cases that have occurred, in this study it is necessary to analyze the level of alertness of online motorcycle taxi riders with the aim of knowing the level of alertness of online motorcycle taxi riders so as to reduce the accident rate using the Quantitative Analysis Of Situational Awareness (QUASA) method. The results showed that the characteristics of online motorcycle taxi drivers are over confident. Based on the calculation, the level of alertness is 34.94%, the hit rate value is 0.617 and the false alarm rate is 0.498, the sensitivity value of 0.29 and the bias value of -0.135. The conclusion is that online Grab motorcycle taxi drivers tend to be less alert and overly confident so that they endanger themselves, their passengers and road users.
Reducing waste to improve product quality in the wooden pallet production processby using lean six sigma approach in PT. XYZ
Authors: Ishak Aulia , Siregar Khawarita , Ginting Rosnani , Gustia Dinda
Published: December 2020

This company is a company engaged in wood processing. The product produced by this company is wooden pallets. The problems that are found by this company is waste in the production process that are the high defective producs and non value added activities The average disability percentage of wood pallets is 7.52% of the total production per month. The value exceeds the disability tolerance of the company that is 5%. This study proposes to reduce the number of defective products and eliminates non value added activities through design improvement. This problem can be solved by using Lean Six Sigma approach which is a combination of the Lean and the Six Sigma concept with the DMAIC method by providing improvements to increase the number of defective products and eliminate non value added activities. By using the Lean Six Sigma method can provide lean metrics and sigma level calculation values. Based on actual study, the result for the lead time is 212.58 minutes, the process cycle efficiency is 64.40%, the process velocityis 0.0041 processes / hour. Based repair 70.73%, process velocityis 0.0035 processes / hour.