bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical analysis of energy savings due to the use of PCM integrated in lightweight building walls
Authors: Sheeja R. , Kumar S. , Chandrasekar P. , Jospher Abraham J S , Krishnan Sai 
Published: October 2020

Abstract
A new type of PCM layer integrated into an exterior building wall is to reduce the amplitude of the indoor temperature and maintaining the better thermal comfort for human beings. A numerical simulation has been carried out with and without integration of PCM in building walls. In this paper, the effect of different configuration of external building walls were studied and analyzed by the integration of PCM building walls. Using finite difference method, one dimensional transient heat transfer model was developed and solved. The indoor temperature was also analyzed for the summer and winter climatic conditions of Chennai city, India (13.1 Latitude and 79.9 Longitude) in the PCM and Non-PCM buildings. The building wall consists of clay brick with filled with PCM. The numerical simulation result shows that, PCM filled with clay brick wall improves the thermal inertia significantly. Location of PCM layer in the building wall is one of the important factors to reduce the heat gain in the building wall before it enters the room.
Production and Characterization of Biodiesel from Hevea Brasiliensis and Diesel like Fuel from Waste Engine Oil
Authors: Subedi Shreya , Anand M , Gokul Ragavendra S , Ranjitha J 
Published: October 2020

Abstract
In today’s application, it is essential to formulate the use of diesel and biodiesel in an environmentally generous manner. In this experimental study, an attempt was made to increase the performance and reduce the exhaust emission by blending biodiesel with diesel extracted from waste engine oil on their performance and emission characteristics. The bio-oil is extracted from the seeds of Hevea Brasiliensis using soxhlet extraction process. The crude bio-oil was converted into biodiesel using transesterification process. The percentage yield obtained was high, in the case of heterogeneous base catalyst CaO compared with homogenous base catalyst. Further, the trans-esterification reaction was optimized using the following condition reaction like temperature at 60°C, reaction time ∼1.5 h, molar ratio 9:1 (oil: methanol) and 3% catalyst (w/w). The waste engine oil was distilled using fractional distillation process to produce fuels which is used in engines using inert silica granules. The bio-oil, bio-diesel and diesel samples were characterized using FT-IR and GC-MS spectroscopic techniques. Based on the spectral data, fatty acids, fatty acid methyl ester and hydrocarbon derivatives were identified. Similarly, physical properties were analysed for the produced fuel and biodiesel such as density, viscosity, flash and fire point and calorific value and the results are comparable with ASTM standards. Based on the fuel properties, biodiesel and diesel like fuel obtained from waste engine oil will be used in future to study their engine characteristics.
Process Optimisation and Kinetics Study of Biodiesel Production from Dairy Waste Scum Using ZnO Heterogeneous Nanocatalyst
Authors: Sharma Utsav , Muralidharan N.G , Vijayalakshmi S , Ranjitha J 
Published: October 2020

Abstract
The present paper describes about the biodiesel production from diary waste using zinc oxide as a heterogeneous catalysts. The bio-oil from dairy waste scum was collected and used for biodiesel production. Zinc oxide nanostructures was synthesised by sol-gel method and characterised using particle size analyser, X-ray diffractometer and thermogravimetric analyser. The synthesised heterogeneous ZnO nanocatalyst was used for transesterification of dairy waste scum. The maximum biodiesel yield of 94.8% was obtained at the optimised reaction conditions, 0.8 wt. %, and methanol to oil molar ratio 9:1, reaction time 40 min, reaction temperature 65 °C, and mixing speed 300 rpm. The fatty acid methyl ester production reaction follows a first order reaction rate. This research work shows that synthesised ZnO nanocatalyst was an effective catalyst to produce biodiesel from dairy waste scum.
Investigation of the effect of zinc borate on the physic mechanical properties of PVC plastic
Authors: Borukaev T A , Shaov A Kh , Kharaev A M , Borodulin A S 
Published: October 2020

Abstract
Zinc borate crystalline hydrate of the composition 2ZnO·3B2O3·3,5H2O was obtained by the interaction of zinc oxide and boric acid in the presence of a seed. The composition of the obtained crystalhydrate of zinc borate was confirmed using IR spectroscopy and gravimetric analysis. It is shown at what temperatures the obtained zinc borate crystalline hydrate loses crystallization water and in what quantity. To evaluate the antipyretic properties, the obtained zinc borate crystalline hydrate was introduced into the polyvinylchloride plastic compound grade NGP30-32, replacing industrial zinc borate in the formulation. It was found that polyvinylchloride plastic containing the obtained zinc borate crystalline hydrate is not inferior in its thermal, fire-resistant and physic mechanical characteristics to a compound containing industrial zinc borate. At the same time, the main indicators of polyvinylchloride plastic containing laboratory zinc borate crystalline hydrate complies with the requirements for fireproof plastic compounds.
Selection of the best available technology based on the Analytic Hierarchy Process
Authors: Brom A , Stoyanova M , Sidelnikov I 
Published: October 2020

Abstract
The article investigates the problem of choosing the best available technology that must match the concept of sustainable production. When choosing a technology, the difficult task of comparing alternative technological options should be solved. It is necessary to assess the indicators of environmental, economic and social criteria, but which often contradict each other. The article presents an approach to select the best technology for the production of metal grid, composite grid and basalt grid with the use of Analytical Hierarchic Process.
The influence of the use of composite materials on the rationing of material resources in mechanical engineering
Authors: Sidelnikov I , Brom A , Omelchenko I 
Published: October 2020

Abstract
The majority of machine-building enterprises, when planning material and technical supply (MTS), use various statistical data collected and systematized for previous periods that underlie the calculation of standards for resource consumption. Depending on the level of technical development of production, used technologies and changes in the design of products, factors are identified that determine the need for adjustments to consumption rates in a minimum time. The article analyzes structural and technological factors, substantiates their influence on the determination of various types of consumption rates during the formation of MTS.
Polyetherimides for creation of heat-resistant polymeric composite materials with high physical and mechanical properties
Authors: Borodulin A S , Kalinnikov A N , Tereshkov A G , Muzyka S S 
Published: October 2020

Abstract
Thermoplastic and soluble in organic solvents polyetherimides are of considerable interest for the creation of heat-and heat-resistant composite materials with high physical and mechanical properties. In recent decades, the main scientific approaches to the synthesis of polyimides with the ability to process from melt and solutions in organic solvents have been developed. This methodology is to reduce the glass transition temperature of rigid-chain polyimides by increasing the flexibility of the main polymer chain and / or by reducing intermolecular interaction. Evolution of fine organic synthesis is one of the priority directions of chemical technology development. Chemistry of high-molecular compounds is the subject of research by various scientists, both in the domestic scientific field and abroad. This interest is due to the prospects for the use of materials for industrial purposes. The polyetherimides are of this group of materials contain in their chain of various aromatic, heterocyclic and cycloaliphatic groups, and systems. This article describes the main approaches to the creation of such polymers with improved, compared with polyimides, technological properties and prospects for their application for the production of filled composite materials based on them. The paper presents the properties of the materials under consideration as a justification for the creation of heat-resistant composite materials.
Modeling the nonlinear permeability of porous composite structures with non-Newtonian fluids
Authors: Dimitrienko Yu I , Shuguang Li 
Published: October 2020

Abstract
This work is related to the modelling filtration flow of an incompressible non-Newtonian viscous fluid in porous composite structures. A physical mathematical model of an incompressible non-Newtonian fluid flowing in a porous composite structure has been proposed. The pore–scale description of flow in a reinforced composite is obtained using asymptotic homogenization method. Then, the nonlinear filtration law is investigated theoretically using the anisotropic tensor function representation of the tensor independent variable. The finite element method was used to calculate the local problem, and the distribution of single hole velocity, pressure and non-Newtonian viscosity was obtained. Based on the numerical results verified by the famous Darcy’s law, the nonlinear filtration law of Carreau viscosity fluid was explored and the effective permeability under different parameters was obtained.
Asymptotic theory of multilayer plates with imperfect contact between layers
Authors: Dimitrienko Yu I , Gubareva E A 
Published: October 2020

Abstract
An asymptotic theory of the deformation of thin multilayer elastic plates with non-ideal contact between the layers is proposed. The linearized slip conditions of the contacting layers with different slip coefficients for each pair of layers are considered. An asymptotic theory is an expansion over a small geometric parameter of the original 3-dimensional elasticity problem with sliding conditions of the layers. A recurrent sequence of local problems of elasticity theory is obtained. An analytical recurrent solution to these problems is found, which allows one to determine all the components of the stress tensor in the plate. An averaged system of equations of the theory of thin two-layer plates with slipping layers is derived, which has an increased order of partial derivatives compared with the theory of plates with ideal contact. An analytical solution is found to this problem of bending a 2-layer composite plate under the influence of uniform pressure. Specific effects of plate deformation due to the effect of layer slippage are established.
Dynamic characteristics of modified bitumen systems
Authors: Fedorova L V , Tretyakova Z O , Voronina M V 
Published: October 2020

Abstract
Thiokol-modified bitumens are investigated. Based on the measurements of time-dependent viscosity parameters (melting point, penetration, and spin-spin relaxation time T2 ), it is established that at a content of thiokol more than 25%, formation of a continuous phase is possible, which shows up as a sudden change in the bitumen properties and is associated with the phase inversion. The method of bitumen modification suggested can be recommended for obtaining roofing materials.
Development and implementation of a technology for introducing reinforcement into aluminum matrix composite
Authors: Chen Yijin , Kurganova Yu A , Scherbakov S P 
Published: October 2020

Abstract
In this study, a new method for introducing reinforcement was developed and used in stir casting to fabricate aluminum matrix composites. Different reinforcements (microparticle SiC and nanofiber Al2O3) were incorporated into the technical aluminum AD0 (1050 ISO) alunimum alloy by a mechanical stirrer and then cylindrical specimens were cast. The microstructural characterization of the composite samples showed grain refinement of aluminum matrix with the introduction of reinforcement. The effects of reinforcement on the mechanical properties and impact behavior of the composites were investigated. Based on experiments, it was revealed that the presence of Al2O3 nanofiber reinforcement led to improvement in hardness. This was due to introduction of reinforcement and grain refinement of aluminum matrix. Studies on the fracture surfaces revealed that AMC with reinforcement is brittle, but in the case of nanofibers fillers, tough component was also present, which eliminated the risk of brittle fracture.
Development of a method of hydroerosive saturation of liquids with microparticles of target materials using ultra-jet
Authors: Galinovisky A L , Htet Kyaw Myo , Erokhin S A , Zhenyuan Jia 
Published: October 2020

Abstract
The article deals with the questions of assessing the applicability of the method of ultra-jet diagnostics of carbon plastics. In the work, phenomenological ideas about the process of destruction of carbon plastics under the action of a high-speed-jet of liquid are considered. The experimental part of the work is related to the implementation of the diagnostic effect of the ultra-jet on the surface of the carbon fiber reinforced plastic, the assessment of the geometric parameters of the hydraulic caverns and the qualitative assessment of the state of the fibers and the adhesion in the binder-fiber structure. In this experiment, carbon fiber samples were used both in the initial state and after the inhibitory effect of x-ray radiation. Such a technique made it possible to carry out a comparative analysis of the samples and evaluate the information content of the ultra-jet diagnostics method as applied to the materials under consideration.
Structure, properties and heat treatment of aluminum alloy BAC1 synthesized by 3D printing
Authors: Fachyrtdinov R S , Kuznetsova P E , Savichev I D 
Published: October 2020

Abstract
Article is devoted to studying of influence of the process of selective laser melting and subsequent various heat treatment on the structure of aluminum alloy. On the basis of scientific and technical literature describes the need for and relevance of the application of modern technologies of 3D printing, the possibility of its application. The authors investigate the microstructure and determine the porosity of the synthesized samples of aluminum alloy of the Al-Si-Mg (Cu) system. The dependence of the porosity of the samples on the energy density is established. Also, the author investigated the influence of annealing and hardening modes with aging on the hardness of the samples of aluminum alloy. On the basis of the conducted researches characteristic properties and features of the synthesized material and preferable heat treatment were determined.
Optimization Model for Dairy Farms of Northern Kazakhstan
Authors: Sukoot A H , Suleimenova R Z , Zhanys A B 
Published: October 2020

Abstract
Dairy cattle breeding is one of the most important branches of animal husbandry. It serves as a source of such valuable food products as milk, meat, as well as a source of raw materials for industry. Milk is an almost indispensable basis for nutrition in childhood, both humans and animals. It contains all the necessary nutrients. By its diverse composition, not one of the known foods can compete with it. In milk, there are almost all currently known vitamins.
Modeling of volumetric deformation during compaction of Al-SiC composite materials based on mechanically activated batch
Authors: Sergeenko S N 
Published: October 2020

Annotation
A 3D Spline model of the effect of the silicon carbide content Csic
and the cold compaction pressure p on the bulk deformation of the powder molding ॉν
during the cold compaction of the Al-SiC charge was constructed. The nonlinear character of the dependence ॉν(p) is established for the studied values of the silicon carbide content. The two-stage nature of the cold compaction of the Al-SiC powder mixture was revealed, which is characterized by intensive compaction at the initial stage. A sigmoidal model of cold compaction of a powder mechanically activated Al-SiC charge, which takes into account the initial stage of lightweight structural compaction, is constructed. The dependences of the influence of the SiC powder content on the coefficients of the sigmoidal cold compaction equation are established. A logistic model of the influence of CsiC
on the coefficients of the sigmoidal equation of cold compaction and the average size of agglomerates formed during the mechanical activation of a mixture of Al-SiC composite powder material is proposed. The energy equation of hot compaction is obtained, the value of the compressibility coefficient is determined, and a linear equation is constructed that relates the relative densities before and after hot compaction of the Al-SiC composite material.
Thermoplastic poly ether sulfones for composite materials
Authors: Storoshuk I P , Alekseev V M , Pavlukovich N G , Borodulin A S , Kalinnikov A N , Poleshaev A V 
Published: October 2020

Abstract
Results of the work on controlled synthesis of thermoplastic engineering poly ether sulfones with distinct molecular weights are presented. It is shown that control of time of the chemical reaction with other synthesis parameters being fixed allows for synthesis of poly ether sulfone with desired molecular weight and therefore with desired melt viscosity. The latter is an important parameter for creation of high-quality thermoplastic carbon fiber prepregs.
Determining the interaction surface parameters of the geokhod knife operating body with the face rock
Authors: Aksenov V V , Efremenkov A B , Yu Sadovets V , Pashkov D A , Efremenkov V A 
Published: October 2020

Abstract
One of the main devices of the geokhod having a direct impact on the force characteristics of the underground apparatus is the operating body. During the work of the operating body, the interaction surface of the geokhod operating body with the face rock is formed. The purpose of the research is to determine the parameters of the surface of interaction of the geokhod knife operating body with the face rock.
As a result, it was revealed that the interaction surface parameters of the geokhod knife operating body with the face rock can be divided into two groups: general, which are characteristic for each variant of operating body, and variable, which are characteristic for each variant.
Influence of the knife shape on the operating body cutting force
Authors: Aksenov V V , Efremenkov A B , Yu Sadovets V , Pashkov D A , Efremenkov V A 
Published: October 2020

Abstract
The basic part of any mining machine is the operating body used for mine working. The parameters of the mining machine are particularly affected by the geometric and force parameters of their operating bodies. The knife shape is one of the geometric indicators of the mining machine cutting part. The existing methodology for calculating a geokhod cutting body does not take this indicator into account. The purpose of the work is to determine the influence of operating body knife shape on the strength of the blocked cutting. The research shows that the knife shape affects only the forces for overcoming the frontal resistance of the soil by the front edge of the knife. It is possible to determine the influence of the cutting edge shape of the operating body on the force of blocked cutting. As a result of the study, it was revealed that when the knife is deepened to the entire cutting depth and when it destroys the face corresponding to its shape, the knife shape does not influence the strength of the blocked cutting.
Areas of research on the construction of tunneling underground machines of the Geokhod class
Authors: Aksenov V V , Khoreshok A A , Efremenkov A B , Yu Beglyakov V , Koperchuk A V , Yu Blaschuk M , Yu Sadovets V , Pashkov D A 
Published: October 2020

Abstract
The article presents the features that characterize the complexity and novelty of the main functional systems of underground machines of the “Geokhod” class as an object of design and production. The authors discuss the problems that developers encountered at all stages of creating test models and prototypes of a new class of underground machines “Geokhod”. The lack of special scientific and methodological support is a deterrent to the creation of a new class of underground vehicles. Taking into account the peculiarities of work, interaction with the geo-environment of tunneling underground machines of the “Geokhod” class, the need arose to create a scientific specialty that will be associated with the design and construction of tunneling underground equipment. Thus, by analogy with the aircraft industry, the support for the creation of underground machines interacting with the geo-environment should be assigned to a new scientific profile and the scientific specialty “Construction of underground machines that interact with the geo-environment”. A new scientific direction is considered as a key element of an advanced technological structure for the development of underground space on the basis of advanced development and new approaches in construction geotechnology and geotechnics.
History review of aircraft performance improvement
Authors: Bobkov A , Krivenko M 
Published: October 2020

Abstract
This paper is a review of trends in performance improvement of all-purpose military remotely piloted aircrafts in the last years. The review results are intended for use by designers of such aircrafts. Performance improvement of a machine, aircrafts in particular, is aimed at cost-effective optimization. The fundamental of a design specification for a new all-purpose aircraft is drafting requirements to its military characteristics. It is required to determine if an aircraft requires new or improvement of existing functions that influence the aircraft’s weight taking into account novel technologies to appear soon. No look-ahead analytic base available makes it difficult to determine needs and capacities of the future engineering period. This paper focuses on an analysis of the past period to forecast the aircraft engineering future. A history chart is built to show the design improvements of all-purpose military remotely piloted aircrafts starting from 2005.
Assessment of the anisotropic wood strength on local crushing
Authors: Labudin B V , Nikitina T A , Popov E V , Varenik K A , Novoselova V I 
Published: October 2020

Abstract
Modern structural analysis standards for wooden and glued laminated building structures of civil and industrial buildings, bridges, electric power facilities, communications, etc., on the one hand, have differences, and on the other hand, general design principles (SP). However, the design resistances values are given only for the force vector acting along and across the fibers. The designer has to get the intermediate design resistances values according to the formulas of the 30s, very approximately, and sometimes incorrectly. For example, for cross laminated timber (CLT). Based on previously performed experimental researches and the results of calculations, general patterns of the resistance to local crushing changes were obtained for samples taken from glued laminated timber structures elements (glulam). General approaches have been developed to assess the strength of glulam (σ
cr,a
) and its design resistances to local crushing (Rcr,a
) with varying static geometrical parameters of the hard stamp (ψ = d/l) depending on the external forces vector direction with respect to the wood fibers - lamellas (α). All this makes the research present-day and focused on improving reference documents.