bluuebunny/crossref_metadata_2025 huggingface dataset:
Visualization of the photoelastic method data in the angular zone of a region
Authors: Frishter L U
Published: January 2020

The experimental photoelastic method, which is a continuum method, and the method of forced deformations defrosting, allow us to obtain a stress-strain state in the stress concentration zone on the contact surface of composite structures with a surge of forced deformations on models made of optically-responsive material. The experimental solution is obtained on the model with an angular cut of the boundary, the vertex of which is occupied by the rupture of forced (temperature) deformations. The fringe contour obtained on the model by photoelastic method and the method of defrosting in the stress concentration area, in the zone of angular cut of the boundary and forced deformations surge, is characterized by significant gradients of experimental data: the order of fringes (isochromes), isoclines parameters, stresses, deformations. Modern methods of visualization of experimental data based on digital shooting expand the capabilities of the photoelastic method. The study purpose is to estimate the capabilities of using photoelastic method and the method of deformations defrosting to obtain the stress-state deformation in the angular zone of a region, which is as close as possible to the stress concentration area during digital shooting and data processing, by the standard methods of stress separation.
Structural scheme for the synthesis of stable motion of a walking drive using a self-oscillation control system
Authors: Polyanina A S
Published: January 2020

Walking robots are one of leading directions of scientific and technical developments. An important problem is the creation of control systems that ensure the stable motion of a walking drive along various types of trajectories. In work the structural scheme of a system that implements the controlled motion of the foot point of a walking robot using a self-oscillation generator is given. Modeling of periodic motion generators is based on the use of the second Lyapunov method.
The mathematical modeling as the basis for the method of the rapid evaluation of the resources for the building of the physical level of modern civil engineering facilities information system
Authors: Semenov A B
Published: January 2020

The author discusses the problem of information in the modern civil engineering facilities and proves the necessity for use of wire communication channels on physical level. The author demonstrates the insufficient accuracy of the existing methods for calculation of the cable consumption rate. To eliminate this drawback, it is suggested to apply mathematical modeling. The experimental data on real facilities parameters are given, the algorithm of a simple calculation is provided.
The methodology of storing the information model of building structures at various stages of the life cycle
Authors: Ginzburg A. , Shilov L. , Shilova L.
Published: January 2020

The paper presents an analysis of the current state of processing the results of laser scanning to build information models of construction objects at the operational stage.

The authors proposed a new methodology for combining project documentation and executive (as build) documentation (obtained via laser scanning procedure), presented an application of this methodology in the context of the entire life cycle of a construction project. The authors do not try to process point clouds (laser scanning results) and convert them into BIM objects (existing approach) but offer a methodology for working with raw data as BIM object.
Mathematical modeling of the building materials production processes
Authors: Vasil’eva Olga
Published: January 2020

We propose a new mathematical model of the process of production of building materials based on the reaction of autocatalysis. Discrete kinetic models can be used to mathematically describe this process with a different number of reagents. In the case of two reagents, the Carleman discrete kinetic system can be used to describe the autocatalysis reaction. The mathematical model proposed in this paper takes into account the terms of a higher order of smallness for a small parameter. The account of these terms allows to describe more correctly process. The numerical research of the proposed mathematical model is carried out. Numerical results are presented. The analysis and comparison of the obtained numerical results with the results of the numerical study of the kinetic system of the Carleman equations is carried out.
The deformability of shear bonds in the load-bearing systems of panel buildings
Authors: Lyublinskiy V A
Published: January 2020

Civil buildings, like construction objects, have a certain life cycle; building structures subjected to power influences lose their design bearing capacity and operational suitability over time. The service life of prefabricated buildings was oriented to 50 years. Nevertheless, most of these buildings are still in operation in Russia. The service life of the mass typical series of prefabricated panel buildings is coming to an end, which necessitates a reliable assessment of the stress-strain state of building structures. Analyzes the stress-strain state of the load-bearing systems of mass buildings with linear and nonlinear deformation of shear bond materials. A 9-story large-panel residential building, consisting of one section, was taken as the object of study. Introduction to the algorithm of nonlinear deformation of only one type of shear bond allows us to fix a noticeable difference in the stress-strain state of the vertical load-bearing structures of the building. The discrete-continuous mathematical model creates a methodological basis for researching other basic elements of the spatial bearing system of a multi-storey building and assessing their contribution to the redistribution of efforts.
Tools and examples of intelligent processing, visualization and interpretation of GEODATA
Authors: Taranchuk V
Published: January 2020

The article discusses the results of instrumental filling and usages of the integrated software complex designed for the preparation and testing of digital geological and geoecological models. Proposed methods of calculating the accuracy and confirming the reliability of the interpretation of the initial data are described. Examples of intelligent analysis of the results are given, the possibilities of obtaining and visualizing deviations are described.
Electric field driven transformations of orientational structure in chiral nematic systems with large flexoelectricity
Authors: Oskirko A D , Ul’yanov S V , Valkov A Yu
Published: January 2020

Transformation of the orientational structure in a plane-parallel cell of a cholesteric liquid crystal, was studied depending on the magnitude of the voltage applied to the boundary planes of the cell. The equilibrium configuration of the liquid crystal director field was found minimizing the free energy both analitically and numerically. We took into account the orientational elastic energy in the volume and at the cell boundaries, the energy of an inhomogeneous electric field, and the flexoelectric effect. Systems with large flexoelectric coefficient were studied in detail. It was found, that when small voltages are applied to the cell boundaries, a continuous Fredericks transition occurs first, and then, when certain characteristic voltage is achieved, a significant jump-like change in the orientational structure takes place, and this structure gradually changes with the further voltage increase. It is shown that various scenarios of transformation of the orientational structure can be implemented depending on the actual values of the set of material parameters of the system studied. The discovered ability to control the structure of a liquid crystal in a cell can find use in various technical devices.
Non-destructive determining of foundation pile length variability for reliability analysis
Authors: Rybak Jarosław
Published: January 2020

Contemporary design methods of foundation piles are more and more focused on sophisticated methods based on reliability analysis. Such methods, on different level of complicity, demand precise description of all data under study, not only by means of their average or characteristic values but, on higher levels of reliability analysis, standard deviations of basic variables, possible correlations and type of probability distribution. Most of the basic variables related to the ground were cautiously studied during last decades. The geometry of the pile itself (diameter and length) was usually assumed to be guaranteed and considered as non variable. The work tends to emphasize the role of pile length and present some examples of its non-destructive evaluation. Basic concepts of law strain integrity evaluation, elementary methods of reliability and sensibility analysis are presented and proceeded by results of excessive field testing programs. Some remarks on selection of basic random variables for pile capacity computation is given in discussion section. The results of the study confirm intuition that pile’s length variability plays a secondary role in reliability assessment of pile’s capacity.
Application of gabions for strengthening marine coastal slopes
Authors: Cherkasova Liudmila
Published: January 2020

The work considers the use of gravitational retaining walls made of gabion structures to strengthen the sea slopes. A wide range of possibilities for using gabions in construction is noted. An analysis of the technical and regulatory literature leads to the conclusion that the issue of using gabion structures to strengthen marine coastal slopes is not well understood. The paper describes the experience of using gabions to strengthen and protect against erosion of the sea slope from the moment of creation to complete destruction. A change in the state of the structure during long-term operation and their causes are recorded.
The Ultra-Small Armchair Boron Nitride Nanotubes Study Using a Density Functional Theory Method.
Authors: Jonuarti Riri , Yusfi Meqorry , Triati Dewi Kencana Wungu , Haryanto Freddy , Sprijadi
Published: January 2020

A density functional theory (DFT) method was used to study the structures, stability and band gaps of the ultra-small armchair boron nitride nanotubes (BNNTs). We define the ultra-small size of the armchair boron nitride nanotubes (BNNTs) as a nanotube with diameter less than 1 nm. Each armchair nanotube’s stability and band gap was obtained varied by varying the size of nanotube diameters up to 1 nm. The larger size of diameter the higher stability and wider armchair nanotubes band gap. The results of the ultra-small armchair calculation confirm the same trend of properties with the available calculation data of ultra-small zigzag boron nitride nanotubes (BNNTs).
Electropolymerization of Polyaniline Film as a Conductive Layer for the Electrodeposition of NiCo Alloy
Authors: Budi Setia , Ayuningsih Arum , Pratiwi Citra , Paristiowati Maria , Fadiran Riser , Sugihartono Iwan
Published: January 2020

Polyaniline films were synthesized using the electropolymerization method to produce a conductive layer as an electrode for metal electrodeposition. The layer was characterized using Fourier transform infrared (FTIR), X-ray diffractometry (XRD), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). According to the SEM micrograph, morphological characteristics of polyaniline films included cross-linking and crevices with 0.2 μm diameter. The electropolymerized films were successfully used as a substrate for NiCo alloy electrodeposition.
Analysis of natural rubber compounds with filler Of Oil Palm Empty Bunches Powder and Carbon Black
Authors: Ginting E M. , Bukit N. , Motlan  , Saragih M.T. , Frida E. , Bukit B. F.
Published: January 2020

The study aimed to determine the effect of the addition of carbon black (CB) and Palm Empty Bunch Powder (OPBEP) as a filler in natural rubber compounds on thermal and transmittance properties. The composting method is done at the Open mill. The process of mixing natural rubber with additives, curative agents, activators, accelerator materials and nano OPBEP and CB with variations (0;2; 4; 6; 8)% wt. The results of the study were obtained. FTIR results from coumpound with CB and OPBEP fillers as a whole showed almost the same results. This is due to modifications so there is a possibility of overlapping with uptake on other bands. There is a peak of 2912 C – H asymmetric symmetric stretching vibrations of octadecylamine, respectively. Bending vibration of C – H in the = CH group of 3,4- or 1,2-units. The thermal properties of the DSC thermogram obtained an increase in the melting point and cross-linking with an increase in the content of the OPBA element compared with no filler as well as the CB / filler. In general, a compound with OPBEP filler and CB can be used as a technical product that has more mechanical properties.
Au-Coated PDMS grating for SERS substrate: Comparison of two different grating depths
Authors: Ulum A H , Destarina L , Aminah N S , Srisuai N , Boonruang S , Nuntawong N , Horprathum M , Djamal M
Published: January 2020

Surface enhanced Raman scattering substrate was an alternative analytical tool with ultrahigh sensitivity and rapid response for chemistry, medicine and forensics science. In this work, the surface enhanced Raman scattering (SERS) substrate based on PDMS grating structure created by laser interference lithography using excimer laser modification and further 80 nm-thick Au thin film deposition by dc magnetron sputtering was proposed. We investigated the effect of the grating depth on SERS performance. The methylene blue solution of different concentration was employed to test the SERS performance using the portable Raman spectrometer. The optimal SERS performance can be optimized by fabricating the PDMS grating structure with 850 nm-period, 310 nm-depth and 0.5-filling factor.
The ICARE Practice Based on Worksheet and Physics Experimental to Improve Student Creativity
Authors: Sinuraya J , Wahyuni I , Panggabean D D
Published: January 2020

Creativity is one of the important elements in learning physics but is rarely studied to find out the effects of teaching applied to increasing creativity. The research is intended to describe the use of The ICARE Practice Based on Worksheet in increasing student creativity in the Physics Education Study Program. The course assessment formally uses The ICARE Practice Based on Worksheet and the Independent Torrance Test for creativity. At the beginning of the lesson given an explanation of work instructions followed by group organizing. The group used The ICARE Practice Based on Worksheet to conduct physics experiments with the guidance of lecturers. The experimental results of each group were presented by each group and continued with interactive debates between presenters and comparison groups. Input provided by lecturers and students is used to make reports individually. The Independent Torrance Test is given as a pretest and posttest. Increased creativity is an effect of applying The ICARE Practice Based on Worksheet in experimentation. The gain is based test results were obtained from the posttest and pretest ratings. The test results show that improvement through creativity indicators is achieved on Originality, Flexibility, and Elaboration. The indicator has an increase of more than 70 % of the number of students with N-Gain score is 0.38 in the medium category.
Regional Detection Polluted with Diffusion and Convection Models in Banten Province
Authors: Ruhiat Y , Guntara Y
Published: January 2020

Numerical convection and diffusion models can be used to predict air pollutant concentrations in an area. Changes in air pollutant concentration can be analyzed using diffusion equations which depend on the coefficient of intra-particle diffusivity (D). Whereas to find out the changes in air quality categories become polluted using a convection equation which depends on the diffusivity coefficient between particles (Γ). The combination of the two equations can be used to estimate the polluted areas of a region. The results of the climate analysis indicate that Banten Province if viewed from the direction of the wind, is very potential for the development of increased fish production. Meanwhile, if viewed from the temperature and rainfall of Banten Province the potential for agriculture. However, considering that in the western part of the region there is a large industry with a chimney height of 275 meters, so based on atmospheric stability, the distribution of air pollutants spread far outside the industrial area. This will have implications for other regions so that at high concentrations (with diffusion equations) it will change the air quality (with the convection equation) so that in certain regions and at certain times it will become a polluted area.
Android-Based Physics Learning-Media Apps for High School Students
Authors: Wirjawan J V D , Herwinarso  , Untung G B , Pratidhina E , Wijaya A , Pambayun B , Pratama D , Rombe C M , Putri K A S , Yuliani F R
Published: January 2020

The use of Android smartphones has been emerging quite fast. It distracts most of the students’ attention from their studies. While at one side, it brings some negative impacts on students, on the other hand, it opens some opportunity to use the students’ deep engagement with Android smartphones as a source of excitement to promote physics learning-media. We have conducted research in Surabaya (Indonesia) and its vicinity to address the use of Android smartphones as student physics learning source. Applying the 4-D model, we have developed Android mobile-apps based physics learning-media on several topics of introductory high school physics. The physics learning-media have been tried out by several groups of students and have received positive comments from the users.
Analysis of The Bahal Temple III Site Using Combination Method of Geophysics
Authors: Juliani Rita , Rahmtasyah  , Muhammad Syukri Surbakti , Sianturi Astina
Published: January 2020

The Bahal III temple is an ancient relics temple of the Hindu Kingdom. The research aims to know the underlayer structure of the Bahal III surface and to determine the minerals contents of the boulder sample in the Bahal III temple in the Portibi region, North Padang Lawas. The research methods are Geoelectric and geomagnetic, and XRD methods. The geoelectric method that used in this research was the Wenner-Schlumberger method in two lines. Line length is 155m with 32 electrodes and 5m distance each. The geomagnetic method was done by using 60 grids. Geoelectricity data processing used Res2Dinvand software while geomagnetic data processing used Mag2DC software. Data processing of layer contouring used surfer11 software. Data processing of the XRD test result used Match3 software. The findings showed that the andesite rock layer was found by using the geoelectric method with resistivity value 950 - 1500 Ωm suspected as the rock of temple forming in-depth 3-12m. Geomagnetic test results showed the susceptibility value 0.034(cgs unit) which is andesite rock. XRD test result for minerals contents of the temple boulder sample was dominated by mineral Silicon dioxide (SiO2) 88.8%, Ferric oxide (Fe2O3) 8.9 %, Magnesium oxide (MgO) 1.7% and Titanium dioxide (TiO2) 0.7 %.
Electrodeposition of Zn-doped Cu2O for the Photodegradation of Methylene Blue
Authors: Akhirudin I , Budi S , Yusmaniar
Published: January 2020

Copper oxide (Cu2O) is a well-known semiconductor that is potentially used as a photocatalytic material for the photodegradation of synthetic dyes. In this study, Zn-doped Cu2O was synthesized by electrodeposition, and its performance for the photodegradation of a methylene blue (MB) solution was investigated. Electrodeposition was carried out in a sulfate solution at solution pH values of 4 and 5. Hexagonal and pentagonal particle deposits were formed in the solutions at pH values of 4 and 5, respectively. The deposits were composed of Cu2O and Cu phases, and a high Cu2O phase composition was obtained at pH 4. Photodegradation results revealed that 63.23% and 46.49% of MB are successfully decomposed by electrodeposited Zn-doped Cu2O at pH 4 and 5, respectively. This result indicated that the photocatalytic activity of electrodeposited Zn-doped Cu2O at pH 4 is higher than that at pH 5.
The effect of post annealing time on structural and optical properties of ZnO thin films by sol-gel spin coating method
Authors: Motlan  , Siregar Nurdin , Panggabean Johnny
Published: January 2020

ZnO thin fim has been synthesized by sol-gel spin coating method. The materials used were zinc acetate dehydrate as a basic material, isopropanol as a solution and diethanolamine as a stabilizer. The ZnO thin films were grown on FTO conductive glass substrate and post annealed at 500°C with annealed time consecutively 30, 60, 90, 120 and 150 minutes. The XRD results show that the crystal structure is wurtize hexagonal with size of 22 nm for 30 minute annealing time. The SEM results show a uniform homogeny round granules. UV-Vis measurements show a sharp transmission values and the decrease in their absorbance for all samples in the range of 310 to 430 nm wavelength. The band gaps are within 3.073 -3.140 eV.
Decrease Expression of Tumor Necrosis Factor - Alpha (TNF - α) and Sperm Count Increase in Type 1 Diabetes Mellitus Rat (Rattus norvegicus) Model with Turmeric Rhizome (Curcuma longa L) Extract
Authors: Pratiwi H , Sabirosi B G , Winarso D
Published: January 2020

Diabetes mellitus type 1 (DM type 1) is a type of diabetes caused by pancreatic β cells damaged which producing insulin. Animal DM Type 1 caused inflammation of the pancreas and its impact on the male reproductive organs may decrease the quality and quantity of sperm. This research was aimed to determine the effect of turmeric rhizome ethanol extract (Curcuma longa L.) based on sperm count and expression of tumor necrosis factor-alpha (TNF-α) in the pancreas organ. This experiment was designed by Completely Randomized Design. Induction of DM Type 1 in rats was conducted by injecting Multiple Low Dosage - Streptozotocin (MLD-STZ) intraperitoneally (i.p) at the dosage of 20 mg/Kg BW for 5 days. This study used male rats (Rattus norvegicus) aged 3 months Wistar strain which divided into 5 groups: negative control (A), DM Type 1 (B), DM Type 1 treated with turmeric rhizome Extract 1,2 g/kg BW (C), 1,8 g/kg BW (D) and 2,7 g/kg BW (E) for 42 days. Each group consisted of 4 rats. spermatozoa counted with hemocytometer and measurement of TNF-α expression used immunohistochemical methods. The result of the analysis on one way ANOVA (α = 0,05) data showed that spermatozoa count was significantly increased and TNF-α expression was decreased in rats which treated with turmeric rhizome ethanol extract 2,7 g/kg BW. This result indicates that turmeric rhizome extract may increase the number of spermatozoa and decrease the expression of TNF-α of DM Type 1 rats.
Effect of Goat Milk Yogurt Fortified with Red Rice Bran Flour on SGPT Levels of Rats (Rattus norvegicus) Model Diabetes Mellitus Induced Streptozotocin
Authors: Putri I R , Haskito A E P , Permana D A O A
Published: January 2020

Diabetes mellitus is a metabolic disease characterized by an increase in high blood sugar levels caused by a lack of insulin secretion or impaired insulin work or both. Goat milk yogurt with fortified red rice bran flour can be used as a therapy for diabetes mellitus because it contains high fiber and antioxidants. This study was aimed to determine the effect of giving goat milk yogurt with fortification of red rice bran flour on the levels of SGPT in rats diabetes mellitus induced by streptozotocin. This study used RAL with 20 male Wistar rats divided into 5 groups, namely K1 (negative control), K2 (positive control), P1, P2, and P3. Streptozotocin induction of 45 mg/kgBW at K2, P1, P2, and P3. In therapeutic group used volume of 1 ml/kgBW, 2 ml/kgBW, and 3 ml/kgBW. The data of this study were analyzed quantitatively using the oneway ANOVA statistical test followed by Tukey test α = 0.05. The results showed that the administration of goat milk yogurt fortified with red rice bran flour could reduce SGPT levels in rats. The conclusion that the volume of administration of 2 ml/kgBW is an effective volume of administration to reduce SGPT levels by 50.50 ± 7.59.
Morphology of surface ultrastructure of Duthiersia expansa (Cestoda: Diphyllobothriidea) from water lizards (Varanus salvator) from Sidoarjo, Indonesia
Authors: Putri B R , Suprihati E , Yunus M , Koesdarto S , Suwanti L T , Kusnoto
Published: January 2020

Duthiersia expansa (D.expansa) is a cestoda of the family Diphyllobothriidae which is often found in the gut of water lizards (Varanus salvator). D. expansa worm infection is generally chronic and shows no obvious clinical symptoms but can cause weight loss, edema, ulceration of the intestinal mucosa to death. Although there have been no reports of D. expansa worm infections in humans, all types of animals have the potential to transmit diseases to humans both directly and indirectly. The present study being the first to describe morphology of surface ultrastructure of D. expansa using scanning electron microscopy in sidoarjo, indonesia, managed to compliment and verify the taxonomic valid characteristics of D.expansa as Asian Duthiersia form. Samples are collected by making incisions in the duodenum to the ileum. Sample preparation was carried out at the Airlangga University Medical School. The scanning electron microscope (SEM) analysis was carried out at the Central Institute of Life Sciences Universitas Brawijaya. The results of scanning electron microscope examination show that fan-shaped worm scoleks, bothria in the lateral scolex, existence of posterior pores in scolecs, crasspedot-shaped strobila with uterine pore and different forms of microtriches in tegument of the skoleks and strobila
Description of Gill Histopathology And Water Quality Of Koi Fish (Cyprinus Koi fishio) Infected By Koi Herpes Virus (KHV)
Authors: Yanuhar U , Masruroh N A , Junirahma N S , Caesar N R , Zakiyah U
Published: January 2020

One of disease that attacks in common koi fish until now is caused by infection of Koi Herpes Virus. Koi Herpes Virus (KHV) is one type of DNA virus that attacks the family of Cyprinidae. Based on the preliminary test using PCR techniques gills, of koi fish infected by KHV was positive. This study aimed to determine water quality analysis and histopathological gills of koi fish (Cyprinus Koi fishio Linn) that infected KHV. Water quality measurements and gills tissue of fish observation was conducted in three repetition. Histopathological observations of gills tissue used for PCR analysis. The results of PCR analysis showed light line DNA band with size of 292 bp. The results of temperature, brightness, pH, DO, CO2 and COD are still in accordance with water quality standards, while values of ammonia showed 0.373-0.377 mg/l and BOD 3.986-4.729 mg/l that exceeding prescribed quality standards. Histopathological observations of gills tissue showed damage to the primary lamella form like edema, hyperplasia, atrophy, congestion, and necrosis than the type damage of secondary lamellae like edema, hyperplasia, fusion lamella, telangiectasis, congestion, and necrosis. Suspected KHV infection caused damage for gills of koi fish in histopathological.
Fluid Dynamic Analysis of IAHF (Intra Arterial Heparin Flushing) Stroke Therapy in Microfluidic Channel
Authors: Ningsih Z , Hakim L , Prayogi I B
Published: January 2020

Ischemic Stroke is a disease that inhibits blood supply to the brain. One method in handling ischemic stroke patient is Intra Arterial Heparin Flushing (IAHF) which has been claimed to be able to improve motoric function of a patient. However, in vitro clinical research to understand IAHF is scarce. One of in vitro methods can be applied is using microfluidic. This research aims to create a microfluidic system that can represents blood vessel system of a stroke patient and to quantify volumetric flow rate of 1,3-Propanediol (as a blood model) in microfluidic channels. Microfluidic which is made of acrylic with a square-wave design, is employed to represent a thrombotic ischemic stroke and embolic ischemic with the addition of wax to represent plaque in blood vessel. Various viscosity of 1,3-propanediol are applied (1.5 mPa. s; 4 mPa. s; 7.2 mPa. s) to represent the effects of heparin drug. The results indicate that fluid Reynold number in the microfluidic channel are 8.8023 x10−4 and 12.3230 x10−4 which is fall in the area of Reynold number laminar flow such as in blood vessels. Volumetric flow rate of 1,3-propanediol decreases when the viscosity increases and when wax is situated in the microfluidic channel. Diluted 1,3-propanediol (at a viscosity of 1.5 mpas) shows similar volumetric flow rate (when it passes through microfluidic channels with wax) with normal blood viscosity 4,0 mpas (when it passes microfluidic channels without wax). This similarity indicates an increase of blood flow when heparin is added in excess in IAHF method, which induces an improvement of organ motoric function.
An Improvement for Background Modelling using a Mixture of Gaussian and Region Growing in Moving Objects Detection
Authors: Arief Soeleman Moch. , Yogi S. , Nurhindarto Aris , Muslih  , Muljono  , Karis W , Pramunendar R.A
Published: January 2020

Most of the research on object detection that uses discussing background is only necessary for the decision of the background model by assuming all statistical objects are part of the background. This caused a debate called “foreground aperture,” where statistical purposes that represent moving backgrounds, the position of the initial object will be detected as false detection. Related to the new background modeling is needed to overcome this problem. This paper proposes how to obtain an efficient background model that meets real requirements. As a background model, the Mixed-of-Gaussian Model (MOG) was adopted and refined with some improvements with the Region Growing method. Evaluation to measure the performance of the MOG algorithm and Region Growing by using a detection rate to calculate the number of right and wrong in the detection of moving objects.
A support system for accepting student assistance using analytical hierarchy process and simple additive weighting
Authors: Wanti L P , Somantri O , Abda’u P D , Faiz M N , Maharrani R H , Prasetya N W A , Susanto A , Purwaningrum S , Romadoni A
Published: January 2020

The Government through the Ministry of Religious Affairs provides assistance to disadvantaged students through the BSM (Indonesian Cash Transfer Programme for Poor Students) program. BSM is in the form of giving some cash to students from various levels of education such as Madrasah Ibtidaiyah (MI), Madrasah Tsanawiyah (MTs), Madrasah Aliyah (MA). BSM recipients come from disadvantaged families who have been selected through various criteria determined by the Ministry of Religious Affairs through schools. Schools still find it difficult to determine which students are eligible to receive BSM, hence to help the school in making decision about BSM acceptance, this study will apply the analytical method of hierarchy process and the simple additive weighting method to the decision support system for determining the scholarship to meet the criteria set by the school. Through a combination of analytical hierarchy process and simple additive weighting methods, the determination of prospective beneficiary students by counting the highest weight through a combination of both uses 5 criteria and 26 alternatives in the decision support system can be done. The purpose of this study is to create a decision support system based on the user-centered design oriented to all user needs, therefore the user can determine the system model used. Users can map an interactive system with various modules that are used through the implementation of user-centered design to produce a useful system and in accordance with the objectives. The results of this study are recommendation of decision support system for disadvantaged students to help with a combination of AHP and SAW of 5 (five) criteria and 26 alternatives used and oriented to the user.
The Role Of Internal R&D Efforts Toward Company’s Absorptive Capacity
Authors: Laila Widya , Alfarisi Salman
Published: January 2020

In the business world, a company’s proprietary of technology is a very important infrastructure in helping gaining the profit. In order to reduce expensive research expenses, today business trend tend to push managerial to switch from developing its own technology to adopting third party technology. This conversion also helps stimulating innovation to fill requirements which will improve performance at the end. And the success of an external technology acquisition is determined by the accumulation of absorptive capacity of the company itself. This paper proposed a model that demonstrated the role of internal R&D’s effortss towards company’s Absorptive capacity to increase the successful of external technology acquisition.
Cost of Quality Optimization in Sand Casting Operations
Authors: Alfarisi S , Sokhibi Akh. , Alifiana Mia Ajeng
Published: January 2020

Sand casting is one of the oldest methods applied in foundries industry. However, this method has several disadvantages such as high consumptions of energy. It has an impact on total cost production per pieces. In other side, the problem of cost of quality need an appropriate approach to reduce this cost immediately. This study proposed the alternative sand casting process, CRIMSON (Constrained Rapid Induction Melting Single Shot Up-Casting), to investigate the differences between this methods. The result of this study was indicate clearly that CRIMSON sand casting has a lower total cost per pieces which is the result of lower energy consumption and no cost in sortation and rework because the process was in statistical control.
An Adaptive Approach to Controlling Parameters and Population Size of Evolutionary Algorithm
Authors: Muzid Syafiul
Published: January 2020

Evolutionary algorithm (EA) is a part of evolutionary computing inspired by the theory of biological evolution. Evolutionary algorithms have three parameters that must be defined, namely population size, probability of crossing over, and probability of mutation. The absence of standard rules in setting the value of these parameters becomes a difficulty in utilizing evolutionary algorithms to solve optimization problems so that it can cause early convergence in obtaining local optimum values. This research was conducted to find a way to adjust the value of these parameters by using fuzzy logic to determine the probability of crossing and mutation probability and the method of determining population size based on the best fitness value. This method is called Population Resizing on Fitness Improvement Fuzzy Evolutionary Algorithm (PRoFIFEA). The testing of this method uses the problem of Traveling Salesman Problem (TSP) compared to the standard evolutionary algorithm method which states that the PRoFIFEA method is able to find a more optimal solution.
Influence of the β-particle flux and UV-irradiation on the properties of alloys, being at the non-equilibrium state
Authors: Fedorov V A , Boytsova M V , Pluzhnikova T N , Berezner A D
Published: January 2020

Investigation of the influence of the β and UV-irradiation has been provided. It has been shown, that recovery of the tensile strength does not occur after UV-irradiation, that is, the structural changes are irreversible. Structure of alloys has been observed after β-irradiation and the possible mechanisms of melting and crystallization were proposed.
Vibrating kinetics of the Luders front
Authors: Zuev L B , Barannikova S A , Zharmukhambetova A M
Published: January 2020

The regularities of the inhomogeneous plastic deformation such as Lüders bands are considered at the yield plateau. It has been established that the Luder front has stick-slip motion under these conditions. Such a character of motion at the deformation front is associated with the inhomogeneous distributions of the components of the plastic distortion tensor. A plausible estimate of the oscillation frequency was obtained during the development of the Lüders front. The estimation of the spatial period (the length of the autowave of localized deformation) also corresponds to reality.
Application of full-scale strain studies results for determining the equipment internal surfaces damages during rapid changes of coolant temperature
Authors: Maslov S V
Published: January 2020

The method for metal damage determining for the inner surfaces of power equipment exposed to the coolant with a rapidly changing temperature is considered. Due to the impossibility of deformations and temperatures direct measurement for the inner surface, a calculation-experimental algorithm is proposed based on processing the results of strain measurements obtained for the outer surface in geometrically homogeneous and non-uniform zones of the structure. To qualify the functions for changing stresses and temperatures on the inner surface, in this paper, it is proposed to use the algorithm based on solving inverse problems of mechanics. The recovered functions of the temperature stresses temporal variations for the interface zone of the pipeline and the nuclear power plant body are presented.
Evaluation of the performance of sealing rubbers operated in conditions of abrasive wear and low temperatures
Authors: Petrova N N , Portniagina V V , Mukhin V V , Morozov A V
Published: January 2020

The studied materials based on the new rubbers of unique frost resistance -propylene oxide rubber (Tg = -74 °C) and Hydrin T6000 epichlorohydrin rubber are recommended to be used as static and dynamic sealing parts for the equipment operated in the North. This was based on the full-scale tests in cold climates (Republic of Sakha (Yakutia)) and evaluation of tribological characteristics (coefficient of friction) at negative temperatures. The standard techniques were used in assessing of the changes of the physical and mechanical, relaxation, and low-temperature characteristics of model rubbers after aging. A special testing unit and a method for conducting the tests were developed to estimate the coefficient of friction at low temperatures.
Investigation of thermal and deformation processes in the welding of shell structures made of carbon and high-alloy structural steels
Authors: Nigay R , Nigay E , Mironova L
Published: January 2020

An experimental study of thermal processes in the welding of two intersecting shells of low-alloy structural steels of increased strength was carried out. As a prototype, a welded structure consisting of shell elements with different wall thicknesses was chosen. The features of the welding process are identified, which include: multi-pass manual welding with a breakdown of the joint contour into several sections. The results of studies of thermal and deformation processes are given taking into account the features of the welding conditions and the formation of the weld. Qualitative and quantitative estimates showed that minimizing the residual stress state of the welded structure can be achieved by the optimal choice of welding conditions.
Plastic deformation hardening of iron-nickel alloys
Authors: Pakhomova S A
Published: January 2020

The purpose of the study is to determine the influence of the structural state of the surface layer on the possibility of enhancing the properties of heavy-loaded parts, including gear wheels, by plastic deformation. Plastic deformation was carried out by shot-blasting treatment. Since the behavior of the structure of the carburized layer of gear wheels is very complex, single-phase iron-nickel alloys were studied as model alloys. It is shown that the contact fatigue strength and other operational properties of parts can be improved if we apply shot-blasting treatment in optimal conditions. After the latter should be low-temperature tempering, causing strain aging. The positive effect of such complex processing is associated with the formation of a favorable substructure - a substructure of martensite with high resistance to local microplastic deformation.
Influence of heat treatment modes on the formation of structure and physical and mechanical properties of cast blanks from the aluminothermic alloys
Authors: Popov A V , Predein V V , Zhilin S G , Komarov O N
Published: January 2020

The production of aluminothermic alloys is accompanied by high temperatures of the reaction products, the control of which is difficult both by direct and indirect methods. Filling the metal into the mould without controlling the casting temperature provides a high gradient between the metal and the mould, which leads to the formation of quenching structures and, in some cases, structural heterogeneity of the blanks. To reduce the temperature of the reaction products, an introduction to the composition of mixtures of inert additives, which determine the change in the chemical composition of the alloys, is used. The removal of high internal stresses and the ordering of the structures of the experimental samples are carried out by using homogenizing annealing. Moreover, in typical structure characteristics of cast blanks, transformations occur, as well as the diffusion of individual chemical elements throughout the blank volume. The purpose of this work is to study the influence of the procedure of homogenizing annealing on the formation of the structure and physical and mechanical properties of aluminothermic cast blanks. This paper presents the results of the study of the effect of homogenizing annealing on the formation of a structure in iron-carbon alloy castings. Iron-carbon alloys were produced by means of a new casting technology – aluminothermy.
The kinetic of the true stress at low-cycle loading
Authors: Romanov A N
Published: January 2020

Features of grows on true tension at elasto-plastic strains at static and cyclic loading of structuralmetal materials in connection with their structural state (hardening, softening) are considered in this article. The features of the use of strains and kinetic criterion connected with the bearing capacity of material estimated by extreme plasticity of plastic strains at the time of formation of a neck are shown. It is established that growth of true tension at quasistatic destruction is connected first of all with active accumulation of the residual strains. Methods of strains of nature of behavior of material are described (hardening, softening, stabilization) at cyclic elasto-plastic strains. When loading with the set scope of elasto-plastic strains (tough loading) significant change e tension is observed only in the first (hardening) and the last (softening) cycles. Significant changes in true tension it is observed and directly in loading cycles. It is important to consider the specified changes of true tension when modeling processes of elasto-plastic strains of structural materials and also at the solution of a question of extension of a resource of the designs which fulfilled the resource.
Damage accumulation in cyclically stable steel under low-cycle loading
Authors: Romanov A N , Filimonova N I
Published: January 2020

Abstarct. The contribution of variable plastic strains (hysteresis loop), unilaterally accumulated plastic and elastic strains in the total accumulated damage in the limiting case (macro-crack formation) under quasi-static fracture is shown on the basis of the deformation-kinetic criterion of fatigue failure of cyclically stable steel, when the accumulated plastic strain is equal to or commensurable with the strain of a single (static) fracture. It is shown that in the case of low-cycle failure, the main damaging fraction is introduced by the static component (unilaterally accumulated strain), the value of which decreases with the increase of the number of cycles to failure (reduced load amplitude). This increases the contribution of variable cyclic strain. The influence of elastic strain in the area of quasi-static fracture is negligible, and the calculation of durability in practical applications can be carried out without taking into account the damaging role of elastic strains.
The effect of transition metals on the structure and hardening of Al-Mg-Si alloys after cold plastic deformation
Authors: Bochvar N R , Rokhlin L L , Rybalchenko O V , Leonova N P , Yu Tabachkova N , Rybalchenko G V , Ovchinnikova O A
Published: January 2020

The effects of equal-channel angular pressing (ECAP) and rotary swaging (RS) on the change in strength properties during aging at 170 ° C of Al-Mg-Si alloys doped with Sc, Zr and Hf additions was studied. The methods of measuring hardness, electrical resistivity, testing mechanical properties, light and transmission electron microscopy were used. The higher hardening effect compared to the initial state was found in the alloys after ECAP than after RS, whereas the strength properties (tensile strength and yield strength) were higher for alloys subjected to RS than ECAP. Al-Mg-Si alloys with the combined additives of scandium with zirconium and scandium with hafnium showed practically the same values of hardness and strength properties at tensile testing during aging. The reason is in the identical nature of the decomposition of the supersaturated solid solution. It is determined by the sequence of precipitation of the strengthening phase Mg2Si and (Sc1-x, Zrx) Al3 and (Sc1-x, Hfx) Al3 dispersoids which impede the movement of dislocations both in alloys after deformation and after aging.
Influence of dispersity on local physical, structural, magnetic and thermodynamic properties of bcc Fe and its binary alloys
Authors: Udovsky A L
Published: January 2020

The model was proposed for iron nano-particles (and solid solutions based on bcc-Fe) containing a core and a surface layer coherent with each other in the form of a two-phase stratifying parts (“surface” and bulk) system with different local physical properties. Using the results of measurements of the experimental temperature dependence of the heat capacity and the application of the Debye models for both the “core”-phase and the surface layer (“surface”-phase) as two-phase heat capacity components for Fe nanoparticles, it was shown by calculations that the local elastic modulus for the surface layer is nano-particles are approximately 2 times smaller than for the “core”-phase of the nano-particle iron. The purpose of the research is to establish the relationship between local physical properties (bulk modulus of elasticity, static displacements of iron atoms surrounding an impurity atom, magnetic moments) for the core part and the surface layer of nanoparticles. From the condition of local mechanical equilibrium it was shown that static displacements of Fe atoms around an impurity atom in various coordination spheres on the surface of nanoparticles of Fe-rich binary BCC solutions of Fe - (Cr, V, Mo, W) with nano-particles increase significantly (compared to static displacements of Fe atoms “core” of nano-particles).
Non-linear description of hardening zone of steel
Authors: Shinkin V N
Published: January 2020

The most well-known classical descriptions of the steel’s hardening area are the non-linear descriptions by Nadai and Ludwik. However, all these approachings have a large relative error (up to 35-45 %) with respect to the experimental hardening curves obtained on the modern universal tensile machines. In addition, the significant drawback of the Nadai’s and Ludwik’s approachings is the infinite derivative (the tangent of inclination angle) of the stress curve at the beginning of the stretching of the rod (ε = 0). It contradicts the classical Hooke’s law for the small elastic deformations and is not observed in none of the metals in practice. Below we propose other method of the direct and inverse non-linear descriptions using the finite or infinite power series with the displacement of the relative deformation. It is shown that this method is much more accurate than the classical description methods.