bluuebunny/crossref_metadata_2025_split huggingface dataset:
A comparation of different strategies in Principle Component Analysis (PCA) algorithm for clustering human tooth surface using Laser-Induced Breakdown Spectroscopy (LIBS)
Authors: Trisnawati N L P , Krisandi A , Widagda I G A , Suprihatin I E , Suyanto H 
Published: July 2020

Abstract
The aim of this work was to observe homogeneity of human tooth surface using classification technique by laser-induced breakdown spectroscopy (LIBS) coupled with principle component analysis (PCA) algorithm. The human tooth was irradiated by 110 mJ Nd-YaG laser (1064 nm) under Helium gas with flow rate of 50 ml/s to produce plasma. Photon emission of the plasma was captured by ocean optic spectrometer HR 2500+ and displayed spectra of intensity as a function of wavelength. The spectra data were analysed by different strategies in PCA algorithm for classifying human tooth surface. The spectra data were split into three ranges that were a full spectral window, FW (200-850 nm), long special spectral window, LSW (380 – 660 nm) and short special spectral window, SSW (550 – 600 nm). These selected suitable input variables using spectral windows can reduce the influence of over fitting phenomena on classification results. Prior to PCA analysing, data were treated by different strategies of pre-processing namely linear baseline correction, area normalisation, and no pre-processing. The results showed that the short special spectral window (SSW) using pre-processing of area normalization could either clustering and distinguishing parts of human tooth surface clearly. Conclusion dentin surface has highest homogeneity of all.
Kinetics modeling studies of type 1 diabetes mellitus treatment with the function of exogenous glucose and insulin injection
Authors: Kartono A , Arjuna D W , Wahyudi S T 
Published: July 2020

Abstract
Mathematical modeling on dynamics system of glucose-insulin in the human body was one of the interesting researches in the complex system of physics. This research could be used as a treatment simulation of type 1 diabetes mellitus (T1DM). In this study, the function of exogenous glucose and insulin would be studied because of these were important factors to describe the maintaining of metabolism in the T1DM subject, especially were the blood glucose concentration in the human body. The modified minimal model would be combined with the functions of exogenous glucose and insulin injection. To control the glucose concentration in the T1DM subject was very dependent depend on the administration time of exogenous glucose and an insulin injection since these could affect the kinematics of the glucose-insulin system in the blood. Based on these simulation results, the optimum treatment was obtained by the first injection of the exogenous insulin of 560 μU/(mL.min) from 0 to 16 min. The administration of exogenous glucose was given by the amount of 47 and 23 mg at time 7 min and 15 min. Later, an injection of the exogenous insulin was given by 38.1 μU/(mL.min) from 35 to 180 min. In this treatment scheme, the intravenous glucose tolerance test (IVGTT) curve during 200 min, the value of R
2 was 0.98. It indicates that the treatment simulation results are agreed. Setting the timing and amount of glucose intake and insulin injection affects the glucose concentration in the blood on T1DM subjects so no occur condition of hyperglycemia or hypoglycemia.
Simple harmonic motion experiments with the accelerometer sensor on a smartphone: Improving the problem solving-ability
Authors: Nuryantini A Y , Fajriah H N , Zakwandi R , Nuryadin B W 
Published: July 2020

AbstractThe purpose of this study is to discover the improvement in students’ problem solving abilities after learning activities through a simple harmonic motion experiment method using an accelerometer sensor on an smartphone and revealing student responses on it. Pre-experimental research design with one group pretest-posttest design was used in the study. The samples in this study were students of Class X IPA 1 of SMAN 1 Cilimus Kuningan, West Java. Data on the improvement of students’ problem solving abilities were obtained through an essay test while the student’s response data was obtained through the distribution of response questionnaires. The results showed that the problem-solving ability experienced by students increased in the moderate category. Whereas, the results of the responses of students showed that most of the students responded positively to the learning activities of the sensor accelerometer on this smartphone. So, experiment with smartphone has a potential for improving students problem solving skills.
The effect of Ag on thermoelectric performance of Cu1-xAgxS tetrahedrite/Al prepared using modified polyol methods
Authors: Aditya D , Rizky A S , Suprayogi T , Yogihati C I , Diantoro M , Sunaryono  , Said S M 
Published: July 2020

Abstract
In principle, thermoelectric technology is a semiconductor which capability to convert thermal energy into electrical energy. We used Ag-doped CuS deposited on aluminum foil as a sample understudied. The Cu1-xAgxS was prepared using a modified polyol method. Firstly, CuS powder was dissolved together with dopant using TEG (TetraEthylene Glycol) and NaBH4 with nitrogen, heated at 200 °C, and followed by centrifuged at 5000 rpm. The Characterization of CuS was carried out using XRD, SEM, and I-V. It is shown that the electrical conductivity tends to increase with increasing the Ag dopant. The highest electrical conductivity was reached at 70 °C. We also found that the crystallinity enhanced with the addition of Ag into CuS. Meanwhile, morphological inspection revealed that the increase of Ag, causing changes in grain shape.
The influence of students’ score by compare learning model auditory intelectually repetition and visualization auditory kinestetic of wave and vibration materials in SMP Negeri 33 Bandar Lampung
Authors: Latifah S , Anggraini W , Tamara O 
Published: July 2020

Abstract
This research aims to know the influence of students’ score comparison in the cognitive and affective aspect, using AIR and VAK learning model. This sample research is VIII-A, with using VAK learning model as experimental class 1 and VIII-B using AIR learning model meanwhile sampling technique that is using pursosive sampling technique. This researcher used quasy eksperimental research. The design that researcher use is (control group pretest-posttest design). The data is being analyze by using normalized gain used microsoft excel program that aim to know improvement of students’ score. Then the data tested statistically to pretest and postest students’ score by doing normality test, homogeneity and t-test by using microsoft excel program. The average value in the cognitive aspect, the N-gain score of AIR class is fair category, the N-gain score of VAK class is high category. In the affective aspect VAK class is better of the VAK class. The result of statistical test calculated tcount > ttabel its mean that Ho was rejected and H1 was accepted. The result of this research showing that the magnitude of effectiveness AIR and VAK model is the fair category. VAK model more effective than AIR model.
The method for quantitative magnetic resonance imaging of agar phantom with contrast agent
Authors: Dwihapsari Y , Asdiantoro E , Maulidiyah N 
Published: July 2020

Abstract
Magnetic Resonance Imaging (MRI) is one of the reliable instruments in medical physics for diagnostic and treatment monitoring. In MRI scanning, data were acquired using several techniques depending on the parameters being measured. Several quantitative MRI methods were conducted to obtain values of some parameters in MRI, such as spin-spin relaxation time or T2. T2-value was generally obtained using spin-echo sequence and the recent development used multiple spin-echo sequence to significantly reduce acquisition time. The quantification of T2 is achieved by exponential fitting of echo-time with signal intensity. Although the quantification is quite straightforward, some distortion and errors were found during quantification process due to several factors. In this study T2 quantification of agar with various concentrations was conducted and the study was focused on the processing method for T2 quantification. The fitting methods based on mono-exponential and bi-exponential models would be applied and the results would be compared to find the best method for quantitative T2 MRI of gel phantom. The method would also be applied in agar phantom with addition of CuSO4 contrast agent to observe the effect of contrast agent on T2-value.
Time variations in Galactic cosmic rays as measured from Southeast Asia
Authors: Ruffolo D 
Published: July 2020

Abstract
We summarizetime variations in Galactic cosmic ray (GCR) measurements from the Princess Sirindhorn Neutron Monitor(PSNM) at the summit of Doi Inthanon, Thailand’s highest mountain, since 2007. PSNM is the first neutron monitor (NM) station making long-term measurements in Southeast Asia, with the world’s highest cutoff (threshold) rigidity (momentum per charge) of ≈17 GV. GCR variations with the ∼11-year sunspot cycle or ∼22-year solar magnetic cycle are known as solar modulation. Compared with measurements at lower cutoff, PSNM reveals a distinct pattern of solar modulation related to the interplanetary magnetic field strength. NM viewing directions rotate with Earth, so daily (“diurnal”) variations indicate the GCR anisotropy, and we identified time intervals with unusually strong anisotropy due to a unidirectional GCR gradient. From worldwide NM data, we determine an hourly anisotropy during GCR decreases associated with solar storms, indicating GCR flows consistent with our previous theory that cosmic rays drift into one leg of an interplanetary flux rope and out the other. PSNM was also the first fixed NM to monitor time delays between successive neutrons, providing a proxy for the cosmic ray spectral index using data from a single station, avoiding the systematic uncertainties of cross-station comparisons.
Void ratio effect on dynamic shear modulus and shear wave velocity for soil stiffness in Banda Aceh and Aceh Besar
Authors: Munirwansyah M , Munirwan R P , Listia V , Munirwan H , Melinda Z 
Published: July 2020

Abstract
Aceh located in earthquake disaster-prone area because it is located between two tectonic plates and also surrounded by several active volcanos. When earthquakes shake, the building frequency (f) should not be equal to the natural soil frequency (fn) as it may cause the collapse of buildings. The purpose of this study is to determine dynamic seismic parameters value on the surface layers for forthcoming disaster mitigation. The object study for this research were Rahmatullah Lampuuk Mosque, Sultan Iskandar Muda Airport, Lambaro Bridge in Aceh Besar, TDMRC building, and Taman Sari. Soil samplings from the locations and data obtained from the BMKG such as earthquake center map, coordinates, magnitude, and earthquake depths were used in the study. The result of this research was Gmax value based on Richart method. Kramer method was also used for computing the fn parameters. Some static and dynamic calculation of design parameter result from Rahmatullah Lampuuk Mosque shows that with void ratio (e) = 0.92, the Gmax = 266 × 103 kg/ms2, Vs = 10.096 m/s and fn = 2.524 Hz. The comparison of fn and fstructure = 2.50 Hz which not equal to zero make the building were safe from collapse during previous earthquakes in Aceh.
Prediction of sediment-forming technologies’ effectiveness for enhanced oil recovery in West Siberian fields
Authors: Batalov D A , Mukhametshin V V , Andreev V E , Kuleshova L S 
Published: July 2020

Abstract
The article presents the results of geological field analysis. The presented results showed that the application of methods to equalize the injectivity profiles of injection wells and to reduce the water cut of produced products is most effective with an average water cut of the production of wells. In this case, the maximum effects of the impact are observed on the layers of the third group. It was established that in the reservoirs of the first and second groups, which are at a late stage of development, the most significant effects are produced by flow diverting technologies associated with a large volume of injection of reagents.
Distributed corporate information systems optimization based on genetic algorithm and object model
Authors: Zemlyanskaya S Y , Chengar O V , Savkova E O , Shumaieva O A 
Published: July 2020

Abstract
In paper object model of distributed corporate information system is developed in the form of interacting models of its typical components, which takes into account replication and distribution of data between nodes of computer network, characteristics of hardware and makes it possible to simulating DCIS of any structure. A new modification of the genetic algorithm for the DCIS optimization problem has been developed, in which combined multichromosomes have been used to represent the placement of database tables, applications and parameters of servers, network devices and communication channels, genetic operators of recombination, crossover and mutation have been developed. To optimize the DCIS functioning, together with a modified genetic algorithm, the object model is used, that calculates the fitness-function, forming the optimal configuration of DCIS data distribution and hardware parameters in real time for the performance criterion formulated as the minimization of the system response time. A serial scheme of implementation of the genetic algorithm was developed, which includes full or partial optimization of DCIS in accordance with the requirements. The approach proposed allows obtaining suboptimal solution to the DCIS optimization problem with deviation from the global optimum of no more than 5%.
Application of the symbolic regression method for solving the inverse problem of control of the 3-RPR platform
Authors: Diveev A I , Rybak L A , Malyshev D I , Averbukh M A 
Published: July 2020

Abstract
The paper is devoted to finding the functional dependence of the position of the 3-RPR platform on the control. In this construction, the controls are the lengths of the brackets attached to the corners of the platform. To solve the problem, one of the methods of symbolic regression the network operator method is used. Initially we got a training sample. The coordinates of the corners of the platform are found for the set of control by a numerical evolutionary PSO algorithm. Then, at the second stage, approximation of the obtained data was the network operator method. As a result, we obtain six functional equations that describe depending on the coordinates of the platform angles on the plane, on the values of the lengths of the control leashes. The solution of the inverse problem was performed for each coordinate of the platform angle separately. The feature of this task is that for the same value of control the platform has several provisions. To account for this property, an additional parameter is introduced into the 3-RPR platform control model, which takes an integer value. Each value of the additional parameter corresponds to one position.
The use of mathematical calculations to determine the feasibility of borrowing in the planning period
Authors: Eremeev D V , Boyko A A , Kukartsev A V , Rozhkova A V , Mylnikova E V , Korpacheva L N 
Published: July 2020

Abstract
The article presents mathematical calculations, conclusions and results obtained on the effectiveness of attracting borrowed resources into the economic activities of a commercial organization. In the presented calculations, the statistical method was used - Student’s criterion for assessing the upper limit of the allowable amount of debt. The calculations were carried out as exemplified by a small enterprise LLC “Electrika” (conditional name), Krasnoyarsk, Russia. As a result of the experiments, the values of the level of allowable debt load for the enterprise were calculated. The resulting totals unequivocally indicate that the level of the debt burden of a commercial organization is high and the attraction of additional resources in the planning period is impractical.
Development of a methodology for studying the influence of technological factors of production on the quality of large ingots from stamped steel grades 5XHM and 56NiCrMoV7
Authors: Kovalev P V , Kazantsev E S , Ryaboshuk S V , Erokhina O O , Matveev I A 
Published: July 2020

Abstract
Currently, one of the main problems of metallurgical and machine-building production is the high proportion of defective metal, which is often associated with the formation of flocs in a steel ingot and increased metal contamination by non-metallic inclusions. One of the methods aimed at minimizing the amount of nonmetallic inclusions in deoxidized steel is the use of rare earth and alkaline earth metals as modifiers. The selection of the modifier must be carried out based on the chemical composition of the steel, as well as the technological features of production. In this regard, to assess the effectiveness of the influence of deoxidation and modification technology, it is necessary to develop a comprehensive research methodology that allows taking into account various technological factors of production in the conditions of variability of input parameters. This article presents an analysis of the quality of forgings made of steel grades 5XNM and 56NiCrMoV7, produced according to various technological schemes of deoxidation and modification, based on the use of a complex technique that includes metallographic analysis, X-ray spectral microanalysis, and thermodynamic modeling. Based on the results of the implementation of the method, a conclusion is made about the optimal technological scheme of deoxidation and modification
Plotting phase diagrams of binary alloys and justification of their industrial use
Authors: Filimonov O V , Galiullina I F 
Published: July 2020

Abstract
Binary eutectic solutions are analyzed as a foundation for a Generalized Lattice Model of each component. Phase transitions of binary solutions depending of concentration of its components and temperature are determined with equations for invariant two-phase equilibriums by construction of binary-phase diagrams. The paper demonstrates a possibility to construct binary-phase diagrams with minimal error with respect to reference sources. An example of cadmium-zinc alloy is used to show changes in its characteristics depending on percentages of its components. An application is suggested for items with cadmium-zinc coating.
Study of closely spaced cracks in steel by eddy current method
Authors: Ishkov A V , Malikov V N 
Published: July 2020

Abstract
The article describes the design of an eddy-current transducer intended for studying the effect of closely spaced cracks in steel parts. The eddy-current transducer runs under the control of the developed hardware-software complex with a system for suppression of noise and amplification of signal received from the eddy-current transducer. Signal processing makes it possible to separate the effects of closely spaced cracks on the eddy-current transducer signal and evaluate the contribution of each crack separately. The results of experiments conducted on the samples with cracks of different depths located at different distances from each other have been presented, and the feasibility of finding different cracks located closer than the distance determined by the geometric dimensions of the windings of the eddy-current transducer has been shown.
Improving the efficiency of testing welded joints from thermally hardened steels of spiral seam pipes
Authors: Khabibullin M Ya , Suleimanov R I 
Published: July 2020

Abstract
When analyzing the places of the destruction of welded samples of thermally hardened steels and the relative transverse narrowing, it was found that in the range of relative thicknesses of the “soft” layer τ <0.6–0.8, when the strength of the welded samples is at the level of thermally hardened base metal. Destruction occurs both on the base metal at a distance from the weld, and along the weakened area in the heat-affected zone. At large values of τ, the destruction of the welded samples occurs, as a rule, along the weakened area near the weld. A characteristic feature of fracture of welded samples in a weakened section is a decrease in the relative transverse narrowing ψ compared to the case when the fracture occurs on the thermally hardened base metal at a distance from the weld. However, as is known, the value of ψ for thermally hardened metal is lower than for normalized. Based on the results of theoretical and experimental studies, as well as taking into account the basic principles of fracture mechanics, recommendations were developed on the choice of hydra model parameters impact testing of the pipeline on a section of 266-505 km in the Tyumen region. The obtained values of the crack depth l
cr = 3.9–4.3 mm correspond to the acts of technical failures of the pipeline in section 335–337 km.
Accelerator as an effective replacement of a business incubator in the Irkutsk region
Authors: Konyuhov V Yu , Gladkih A M , Zott R S 
Published: July 2020

Abstract
This article presents a comparison of business incubators with business accelerators as state support projects in accordance with the government order of March 6, 2015 No. 373-p, which implements the innovative development strategy for the period up to 2020 in the Russian Federation. Also is carried analysis, development specifics of them in the Irkutsk region and the advantages/disadvantages of the each system are revealed.
Modeling an automated production control system as part of a reengineering project
Authors: Kukartsev A V , Tynchenko S V , Lobkov K Yu , Fedorova N V , Stupina A A , Shamlitskiy Ya I 
Published: July 2020

Abstract
Nowadays, the operation of production systems common in Russia is no longer relevant. They are already outdated and cannot adequately respond to turbulent global changes, make effective decisions. Also, databases in such systems are isolated and do not interact with other systems. Currently, for enterprises of any industry, automation of information processing and management systems are becoming increasingly relevant. The article presents the project of the enterprise production processes reengineering and its implementation as exemplified by one of the leading enterprises of the Krasnoyarsk Territory, Russia. The procedure includes the development of an automated management system using software products and CASE-tools, the construction of structural-functional models of business processes in AllFusion Process Modeler (BPWin), and simulation using the Arena product. Using the complex of models presented in the article, it is possible to calculate the optimal version of the workflow of the automated control systems under consideration by setting the parameters of the document flow. The introduction of an automated control system allows you to effectively allocate time when processing documents, increase the turnover of funds, and not waste time transferring documents between departments of the branch; less human and material resources are required for the development and maintenance of software. Modeling of production processes reengineering allows us to evaluate the effectiveness of the project before making direct changes in the business-core.