bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation of a Ceramic Matrix Composite Made of Hydroxyapatite Nanoparticles and Polylactic Acid by Consolidation of Composite Granules
Authors: Pietrzykowska Elzbieta , Romelczyk-Baishya Barbara , Wojnarowicz Jacek , Sokolova Marina , Szlazak Karol , Swieszkowski Wojciech , Locs Janis , Lojkowski Witold
Published: June 2020

Composites made of a biodegradable polymer, e.g., polylactic acid (PLA) and hydroxyapatite nanoparticles (HAP NPs) are promising orthopedic materials. There is a particular need for biodegradable hybrid nanocomposites with strong mechanical properties. However, obtaining such composites is challenging, since nanoparticles tend to agglomerate, and it is difficult to achieve good bonding between the hydrophilic ceramic and the hydrophobic polymer. This paper describes a two-step technology for obtaining a ceramic matrix composite. The first step is the preparation of composite granules. The granules are obtained by infiltration of porous granules of HAP NPs with PLA through high-pressure infiltration. The homogeneous ceramic-polymer granules are 80 μm in diameter, and the composite granules are 80 wt% HAP NPs. The second step is consolidation of the granules using high pressure. This is performed in three variants: Uniaxial pressing with the pressure of up to 1000 MPa at room temperature, warm isostatic compaction (75 MPa at 155 °C), and a combination of the two methods. The combined methods result in the highest densification (99%) and strongest mechanical properties; the compressive strength is 374 MPa. The structure of the ceramic matrix composite is homogeneous. Good adhesion between the inorganic and the organic component is observable using scanning electron microscopy.
Rutin-Loaded Poloxamer 407-Based Hydrogels for In Situ Administration: Stability Profiles and Rheological Properties
Authors: Giuliano Elena , Paolino Donatella , Cristiano Maria Chiara , Fresta Massimo , Cosco Donato
Published: June 2020

Rutin is a flavone glycoside contained in many plants, and exhibits antioxidant, anti-inflammatory, anticancer, and wound-healing properties. The main disadvantage related to the use of this molecule for pharmaceutical application is its poor bioavailability, due to its low solubility in aqueous media. Poloxamer 407-hydrogels show interesting thermo-sensitive properties that make them attractive candidates as pharmaceutical formulations. The hydrophobic domains in the chemical structure of the copolymer, a polymer made up of two or more monomer species, are useful for retaining poorly water-soluble compounds. In this investigation various poloxamer 407-based hydrogels containing rutin were developed and characterized as a function of the drug concentration. In detail, the Turbiscan stability index, the micro- and dynamic rheological profiles and in vitro drug release were investigated and discussed. Rutin (either as a free powder or solubilized in ethanol) did not modify the stability or the rheological properties of these poloxamer 407-based hydrogels. The drug leakage was constant and prolonged for up to 72 h. The formulations described are expected to represent suitable systems for the in situ application of the bioactive as a consequence of their peculiar versatility.
The Effect of Oligomerization on A Solid-Binding Peptide Binding to Silica-Based Materials
Authors: Bansal Rachit , Elgundi Zehra , Goodchild Sophia C. , Care Andrew , Lord Megan S. , Rodger Alison , Sunna Anwar
Published: June 2020

The bifunctional linker-protein G (LPG) fusion protein comprises a peptide (linker) sequence and a truncated form of Streptococcus strain G148 protein G (protein G). The linker represents a multimeric solid-binding peptide (SBP) comprising 4 × 21-amino acid sequence repeats that display high binding affinity towards silica-based materials. In this study, several truncated derivatives were investigated to determine the effect of the SBP oligomerization on the silica binding function of LPG (for the sake of clarity, LPG will be referred from here on as 4 × LPG). Various biophysical characterization techniques were used to quantify and compare the truncated derivatives against 4 × LPG and protein G without linker (PG). The derivative containing two sequence repeats (2 × LPG) showed minimal binding to silica, while the truncated derivative with only a single sequence (1 × LPG) displayed no binding. The derivative containing three sequence repeats (3 × LPG) was able to bind to silica with a binding affinity of KD = 53.23 ± 4.5 nM, which is 1.5 times lower than that obtained for 4 × LPG under similar experimental conditions. Circular dichroism (CD) spectroscopy and fluorescence spectroscopy studies indicated that the SBP degree of oligomerization has only a small effect on the secondary structure (the linker unravels the beginning of the protein G sequence) and chemical stability of the parent protein G. However, based on quartz crystal microbalance with dissipation monitoring (QCM-D), oligomerization is an important parameter for a strong and stable binding to silica. The replacement of three sequence repeats by a (GGGGS)12 glycine-rich spacer indicated that the overall length rather than the SBP oligomerization mediated the effective binding to silica.
Atomic Sulfur Passivation Improves the Photoelectrochemical Performance of ZnSe Nanorods
Authors: Huang Fei , Ning Jiajia , Xiong Wei , Shen Ting , Zhao Yanling , Tian Jianjun , Zhang Ruiqin , Rogach Andrey L.
Published: June 2020

We introduced atomic sulfur passivation to tune the surface sites of heavy metal-free ZnSe nanorods, with a Zn2+-rich termination surface, which are initially capped with organic ligands and under-coordinated with Se. The S2− ions from a sodium sulfide solution were used to partially substitute a 3-mercaptopropionic acid ligand, and to combine with under-coordinated Zn termination atoms to form a ZnS monolayer on the ZnSe surface. This treatment removed the surface traps from the ZnSe nanorods, and passivated defects formed during the previous ligand exchange process, without sacrificing the efficient hole transfer. As a result, without using any co-catalysts, the atomic sulfur passivation increased the photocurrent density of TiO2/ZnSe photoanodes from 273 to 325 μA/cm2. Notably, without using any sacrificial agents, the photocurrent density for sulfur-passivated TiO2/ZnSe nanorod-based photoanodes remained at almost 100% of its initial value after 300 s of continuous operation, while for the post-deposited ZnS passivation layer, or those based on ZnSe/ZnS core–shell nanorods, it declined by 28% and 25%, respectively. This work highlights the advantages of the proper passivation of II-VI semiconductor nanocrystals as an efficient approach to tackle the efficient charge transfer and stability of photoelectrochemical cells based thereon.
Effects of Nanoparticle Size and Radiation Energy on Copper-Cysteamine Nanoparticles for X-ray Induced Photodynamic Therapy
Authors: Sah Bindeshwar , Wu Jing , Vanasse Adam , Pandey Nil Kanatha , Chudal Lalit , Huang Zhenzhen , Song Wenzhi , Yu Hongmei , Ma Lun , Chen Wei , Antosh Michael P.
Published: June 2020

The Copper-cysteamine (Cu-Cy) nanoparticle is a novel sensitizer with a potential to increase the effectiveness of radiation therapy for cancer treatment. In this work, the effect of nanoparticle size and the energy of X-rays on the effectiveness of radiation therapy are investigated. The effect of the particle size on their performance is very complicated. The nanoparticles with an average size of 300 nm have the most intense photoluminescence, the nanoparticles with the average size of 100 nm have the most reactive oxygen species production upon X-ray irradiation, while the nanoparticles with the average size of 40 nm have the best outcome in the tumor suppression in mice upon X-ray irradiation. For energy, 90 kVp radiation resulted in smaller tumor sizes than 250 kVp or 350 kVp radiation energies. Overall, knowledge of the effect of nanoparticle size and radiation energy on radiation therapy outcomes could be useful for future applications of Cu-Cy nanoparticles.
The Examination of Viral Characteristics of HIV-1 CRF07_BC and Its Potential Interaction with Extracellular Galectin-3
Authors: Lin Chih-Yen , Wang Wen-Hung , Huang Szu-Wei , Yeh Chun-Sheng , Yuan Ruei-Yu , Yang Zih-Syuan , Urbina Aspiro , Tseng Sung-Pin , Lu Po-Liang , Chen Yen-Hsu , Wang Sheng-Fan
Published: June 2020

HIV-1 CRF07_BC is a B’ and C subtype recombinant emerging virus and many of its viral characteristics remain unclear. Galectin-3 (Gal3) is a β-galactose binding lectin that has been reported as a pattern recognition receptor (PRR) and is known to mediate adhesion between cells and microbes. This study aims to examine the viral characteristics of HIV-1 CRF07_BC virus and the role of extracellular galectin-3 in HIV-1 CRF07_BC infection. A total of 28 HIV-1+ injecting drug users (IDUs) were recruited and 24 (85.7%) were identified as HIV-1 CRF07_BC. Results indicate that significant higher serum galectin-3 was measured in CRF07_BC infected patients and CRF07_BC infection triggered significant galectin-3 expression (p < 0.01). Viral characteristics demonstrate that CRF07_BC virions display a higher level of envelope gp120 spikes. The virus infectivity assay demonstrated that co-treatment with galectin-3 significantly promoted CRF07_BC attachment and internalization (p < 0.01). A co-immunoprecipitation assay showed that pulldown galectin-3 co-precipitated both CD4 and gp120 proteins. Results from an enzyme-linked immunosorbent assay (ELISA) indicate that the galectin-3 promoting effect occurs through enhancement of the interaction between gp120 and CD4. This study suggests that CRF07_BC was predominant in HIV-1+ IDUs and CRF07_BC utilized extracellular galectin-3 to enhance its infectivity via stabilization of the gp120-CD4 interaction.
Systematic Review and Meta-Analysis of Global Prevalence of HBsAg and HIV and HCV Antibodies among People Who Inject Drugs and Female Sex Workers
Authors: Rashti Roya , Sharafi Heidar , Alavian Seyed Moayed , Moradi Yousef , Mohamadi Bolbanabad Amjad , Moradi Ghobad
Published: June 2020

The main objective of this study was to evaluate the prevalence of human immunodeficiency virus/acquired immunodeficiency syndrome (HIV/AIDS), hepatitis C virus (HCV) and hepatitis B virus (HBV) and their co-infections among people who inject drugs (PWID) and female sex workers (FSWs). Data sources were searched from January 2008 to October 2018 in different databases. Data were analyzed in Stata 16 software using the Metaprop command. The results showed that the prevalence of HIV, HCV and HBV among PWID was 15%, 60% and 6%, respectively. The prevalence of HIV, HCV and HBV among FSWs was 5%, 1% and 3%, respectively. The prevalence of HIV/HCV, HIV/HBV, HCV/HBV and HIV/HCV/HBV co-infections among PWID was 13%, 2%, 3% and 2%, respectively. The prevalence of HIV/HCV and HIV/HBV co-infections among FSWs was 3% and 1%, respectively. The results show that the prevalence of HCV and HIV infections in PWID and the prevalence of HIV in FSWs is higher than their prevalence in the general population. Interventions for the prevention of HIV and HCV in PWID appear to be poor, and may not be sufficient to effectively prevent HIV and HCV transmission.
Statistical Characteristics of a Twisted Anisotropic Gaussian Schell-Model Beam in Turbulent Ocean
Authors: Liu Yonglei , Zhao Yuefeng , Liu Xianlong , Liang Chunhao , Liu Lin , Wang Fei , Cai Yangjian
Published: June 2020

The analytical expression of the cross-spectral density function of a twisted anisotropic Gaussian Schell-model (TAGSM) beam transmitting in turbulent ocean is derived by applying a tensor method. The statistical properties, including spectral density, the strength of twist and beam width of the propagating beam are studied carefully through numerical examples. It is demonstrated that the turbulence of ocean has no effect on the rotation direction of the beam spot during propagation. However, the beam shape will degrade into a Gaussian profile under the action of oceanic turbulence with sufficiently long propagation distance, and a beam with a larger initial twist factor is more resistant to turbulence-induced degeneration. As oceanic turbulence becomes stronger, the beam spot spreads more quickly while the twist factor drops more rapidly upon propagation. The physical mechanisms of these phenomena are addressed in detail. The obtained results will be helpful in optical communication systems underwater.
Generation of Terahertz Radiation by Two-Color Ionizing Laser Pulses with Arbitrary Intensity Ratios
Authors: Laryushin Ivan
Published: June 2020

The dependence of the terahertz energy generated by two-color femtosecond ionizing pulses on intensities of both one-color components is studied. The numerical calculations are supported with analytical formulas which help to reveal the nature of these dependences. The optimal intensity ratios in the cases when the frequency ratios in two-color pulse are equal to 2, 3/2 and 4 are found.
Seasonal Influenza Vaccination and Recommendation: The Difference between General Practitioners and Public Health Workers in China
Authors: Rong Hongguo , Lai Xiaozhen , Ma Xiaochen , Hou Zhiyuan , Li Shunping , Jing Rize , Zhang Haijun , Peng Zhibin , Feng Luzhao , Fang Hai
Published: June 2020

Seasonal influenza vaccination for healthcare workers (HCWs) is critical to the protection of HCWs and their patients. This study examined whether the separation of public health workers and general practitioners could affect the influenza vaccine uptake and recommendation behaviors among HCWs in China. A survey was conducted from August to October 2019, and HCWs from 10 provinces in China were recruited. A self-administered and anonymous questionnaire was used to assess HCWs’ demographic information, knowledge, and attitudes toward influenza vaccination, as well as vaccine uptake and recommendation behaviors. The primary outcome was HCWs’ vaccination and recommendation status of seasonal influenza vaccine. Multivariate logistic regression models were used to identify the influence factors of influenza vaccine uptake and recommendation among HCWs. Of the 1159 HCWs in this study, 25.3% were vaccinated against influenza in the previous season. “No need to get vaccinated” was the primary reason for both unvaccinated public health workers and general practitioners. Multivariate logistic regression showed that public health workers were more likely to get vaccinated against influenza (OR = 2.20, 95% CI 1.59–3.05) and recommend influenza vaccination to children (OR = 2.10, 95% CI 1.57–2.80) and the elderly (OR = 1.69, 95% CI 1.26–2.25) than general practitioners. Besides, the knowledge and perceived risk of influenza can give rise to HCWs’ vaccination and recommendation behaviors, and HCWs who got vaccinated in the past year were more likely to recommend it to children and the elderly in their work. The influenza vaccine coverage and recommendation among HCWs are still relatively low in China, especially for general practitioners. Further efforts are needed to improve the knowledge and attitudes toward influenza and influenza vaccination among HCWs, and coherent training on immunization for both public health workers and general practitioners might be effective in the face of separated public health and clinical services in China.
Pernikahan, Perceraian dan Pernikahan Kembali menurut Matius 19:1-12
Authors: Bamba Abednego
Published: June 2020

Pernikahan, Perceraian dan Pernikahan Kembali menurut Maitus 19:1-12
Implementasi Pelayanan Holistik Berdasarkan Matius 25:35-36 pada Warga Binaan di Lembaga Pemasyarakatan Kelas IIA Abepura, Jayapua
Authors: Suyatin Suyatin
Published: June 2020

Pelayanan Holistik berdasarkan Matius 25:35-36
PLASMOCHEMICAL MODIFICATION OF WALL BUILDING MATERIALS
Authors: Bessmertnyy Vasiliy , Puchka O. , Bondarenko Diana , Antropova I. , Bragina Lyudmila
Published: June 2020

the aim of the work is to study the effect of a high-temperature plasma torch on the processes of phase transformations and layer-by-layer modification of the protective and decorative coating on concrete using as a filler a mixture of quartz sand and hollow glass microspheres. The main tasks included: investigation of the processes of evaporation and thermal diffusion of oxides of plasma-coated coatings; study of phase transformations in the melt and its subsequent crystallization in the process of rapid spontaneous cooling of the fused protective and decorative coating; study of the effect of sodium liquid glass on the processes of polymorphic transformations of alumina and the formation of micro-wicks due to the intense diffusion of sodium oxide; study of operational characteristics of protective and decorative coatings. It was established that the initial phases in the protective-decorative coating are α-Al2O3 and CaO∙6Al2O3 (β-Al2O3), and the liquid sodium glass in the coating leads additionally to the formation of Na2O∙11Al2O3. The top layer of the protective and decorative coating is Na–Ca–Al–Si glass with regions of heterogeneities containing an increased content of sodium oxide. The content of aluminum oxide in the protective and decorative coating based on the battle of high-alumina refractory was 95.1 %. The introduction into the coating composition of sodium liquid glass minimizes the processes of dehydration of the binding component and changes the chemical composition of the protective and decorative coating. Reduction of the aluminum oxide content to 83.0 % affects the microhardness indicators. Microhardness of the concrete surface due to the introduction of liquid glass is reduced from 2510 HV to 887 HV.
OPTIMIZATION OF RECEPTURAL-TECHNOLOGICAL PARAMETERS OF MANUFACTURE OF CELLULAR CONCRETE MIXTURE
Authors: Alfimova Nataliya , Pirieva Sevda , Gudov D. , Shurakov I. , Korbut Elena
Published: June 2020

aerated concrete at the moment is one of the perspective thermal insulation materials. However, the production of high-quality aerated concrete products is associated with a number of difficulties, primarily related to the features of the manufacturing technology and, in particular, to the formation of its structure during the period of gas evolution and the impact on this process of a large number of factors. The best conditions for the formation of cellular concrete are created when the maximum gas release and the optimum values of the plasticity-viscous characteristics of the aerated concrete mixture are found. Achieving optimal conditions is extremely difficult, which leads to a deterioration in the physico-mechanical characteristics of the final products. One of the ways to solve this problem is to increase the amount of mixing water, however, along with a positive effect (reducing the viscosity of the system), this leads to a decrease in the gas-holding capacity of the mixture. In this connection, the possibility of increasing the production efficiency of the cellular concrete mixture by optimizing the recipe-technological parameters was considered. With the help of the method of mathematical planning, a three-factor experiment was carried out, as the factors of variation were: the duration of the preliminary aging of the mixture, the dosage of the blowing agent and the water-hard ratio, the output parameters were the compressive strength and the average density of the final products. The obtained results made it possible to reveal the regularities of the change in the output parameters from the variable factors and to establish that the preliminary aging of the mixture before the introduction of the gassing agent positively affects the structure and, as a consequence, the physico-mechanical characteristics of the final products.
INVESTIGATION OF INFLUENCE OF PLASMOCHEMICAL MODIFICATION ON MACRO- AND MICROSTRUCTURE OF SURFACE LAYER OF AUTOCLAVE WALL MATERIALS
Authors: Bondarenko N. , Bondarenko D. , Burlakov N. , Bragina Lyudmila
Published: June 2020

studies of the high-temperature effect of a plasma torch on the formation of a multilayer structure of the protective and decorative coating of autoclave wall materials are presented. The tasks of the work included studies: a temperature gradient in a multilayer protective-decorative coating; chemical composition of the fused, intermediate and deep layers of the protective and decorative coating; influence of sodium liquid glass on the formation of macro- and microstructures of protective and decorative coatings under the influence of plasma; processes of thermal diffusion and redistribution of oxides in the fused, intermediate and deep layers.

It was found that when the plasma torch was treated with autoclave wall materials, the surface layer was heated to a depth of 3000 μm, and the maximum surface temperature reached 2000 °C. The pattern of the change in the structure of the fused and intermediate layer is revealed. It is shown that the preliminary impregnation of the surface of silica brick during plasma treatment due to the formation of a low-melting melt eliminates microcracks in its deep layers, and high plasma temperatures promote intensive evaporation of sodium and calcium oxides from the fused layer.
INFLUENCE OF ZnO AND BaSO4 ADDITIVES ON CONSTRUCTION AND TECHNICAL PROPERTIES OF THE WEAK BASE WHITE CEMENTS
Authors: Timoshenko T.I. , Zalogina A. , Hudasov V.
Published: June 2020

white cement – modern construction material which is increasingly popular every year as it is used not only in the construction sphere, but also and in creation of architectural products.

Today the most famous producers of white cement is Turkey, Denmark and Egypt. Special color of cement is reached due to specific structure and the specialized production technology. Clinker for the white portlandtsement, differs from usual in the increased maintenance of Si2O (23.5-25.5%) and A12O3 (5.5-7%), insignificant quantity of Fe2O3 (up to 0.25-0.35%) and MnO – 0.05-0.15%. The mineral composition of clinker for white cements fluctuates within (%): C3S – 35-50; 35-45; C3A 14-17; C4AF 0.9-1.4. The maintenance of MgO in it should not exceed 4.5%. For production of the white portlandtsement the cleanest kinds of carbonate and sandy-argillaceous raw materials are used. In particular, the straight limestones or chalk containing no more than 0.15% of the painting oxides are applied. The kaolin, waste of its enrichment and other materials are served as a clay component. The fine-grained white quartz sands, waste of quartz sand received at enrichment of a kaolin, etc. to increase in the silicate module are applied.

The ashless fuel which is not forming soot and ashes that helps to avoid pollution is applied to roasting of clinker. Crushing of raw materials is carried out in special mills, and crushing is carried out by means of silicon or porcelain elements. Such production technology helps to achieve the grinding having higher rates than from traditional cements.

Results of a research of influence of mineral BaSO4 and ZnO additives on synthesis and properties of the low-main clinker of the white portlandtsement are given in work: clinker formation, hydration activity, whiteness of cement.
TECHNOLOGY OF PLASMA METALLIZATION OF THE WOOD AND FIBROUS BOARD
Authors: Bondarenko Diana , Bondarenko Nadezhda , Kochurin D. , Bragina Lyudmila , Varfolomeeva S.
Published: June 2020

the scientific and technological principles of metallization of products on the basis of wood with use of plasma high-temperature dispersion are developed. For the purpose of prevention of impact of the highest temperatures of a plasma stream on a front surface wood and fibrous board (fibreboard) an intermediate layer was put.

The structure of an intermediate protective layer, the including mix of epoxy resin with refractory filler is developed. Operation of drawing a protective intermediate layer included several specially developed technological stages. For the subsequent metallization such non-ferrous metals as copper and aluminum in the form of a wire are used. Optimum parameters of plasma dusting of metals on a front surface of a fibreboard are determined

The protective and decorative covering on the basis of non-ferrous metals had high aesthetic consumption and performance properties. The covering possessed the increased coefficient of diffusive reflection and high durability of coupling with a matrix. The dependence of influence of thickness of the raised dust metal covering on durability of coupling of a covering with a substrate is established.

The developed technology of metallization of products from wood in comparison with traditional technologies, allows to lower significantly time of metallization and energy consumption and to increase competitiveness of products both on internal, and on external the markets.
OPTIMIZATION OF RAW MIX COMPOSITION OF SEREBRYANSKY CEMENT PLANT
Authors: Nikitina M. , Erygina A. , Timoshenko T.I.
Published: June 2020

now a top trend of technical development in the cement industry of Russia, is optimization of all technological repartitions of production. Obtaining the quality portlandtsement is multiple-factor process. It is influenced not only by the physical and chemical transformations of raw materials occurring during the firing of cement clinker, but also what will be the composition of the raw mixture and whether this mixture is prepared qualitatively. Work consists in a research and selection of an optimum compounding of raw mix, with the purpose to receive cement with high rates of quality. This direction will allow: first, to expand a source of raw materials, to process raw materials which go to dumps because in it is mute a large amount of quartz and impurity connections contains; secondly, to make small reconstruction of the line of preparation of raw mix. At the moment, the plant works on mixed mixtures of aluminosilicate raw materials, i.e. two types of aluminosilicate raw materials which are previously mixed in certain ratios therefore it affects on the accuracy of dispensing of components are used. Accuracy of dispensing of modern batchers, a component ± (1 … 2) %, is often insufficient. In this regard, the new option of optimum composition of mix is offered and investigated. This option of a "clean" mixing of components, will allow to improve process of mixing of initial raw materials, to operate process of drawing up proportions of mixes in a supply line of materials. And also it will allow to eliminate long-term deviations, guaranteeing the solution of problems at the earliest stage of their emergence. Receiving a qualitative ready-made product, reduction of costs for energy resources and cost efficiency of the proposed solution is result of this work
INFLUENCE OF SiO2 CRYSTAL STRUCTURE ON THE THERMAL CYCLE OF POLYMER COMPOSITES
Authors: Cherkashina N. , Pavlenko A.
Published: June 2020

polymer composites are widely used in the space industry for the manufacture of spacecraft, satellite panels, antennas, thermostatically controlled coatings, etc. In space, they are subjected to harsh environmental conditions, such as ultraviolet, deep vacuum, atomic oxygen, charged particles, anthropogenic debris, micrometeoids, electromagnetic radiation and thermal cycles that cause severe degradation of the material. One of the most important environmental effects of materials based on polymers is the thermal cycle, in which the composite undergoes a large temperature difference from -170˚C to + 200˚C. The paper presents an assessment of the use of composites based on a polyalkane-rich matrix and a filler in the form of an SiO2 amorphous and crystalline structure under thermal cycling conditions. The data on the change in tensile strength, modulus of elasticity in tension and relative elongation in tension of materials after several cycles of a sharp differential temperature (from -190 to +200°C) are presented. The thermal cycle was repeated 5, 10 and 20 times. It is shown that the sample polyalkanimide has a large value of tensile strength and elastic modulus compared with highly filled composites.However, during thermal cycling there is a significant decrease in these parameters.For a highly filled composite sample with 65% crystalline SiO2 content, the decrease in tensile strength and elastic modulus after thermal cycling is insignificant and is within the measurement error. A composite with amorphous SiO2 is more susceptible to a change in mechanical properties after thermal cycling in comparison with a composite containing crystalline SiO2.
STUDY OF PHYSICAL-MECHANICAL PROPERTIES OF ASPHALT-CONCRETE SPECIMENS ON ACTIVATED MINERAL POWDERS OF VARIOUS COMPOSITIONS
Authors: Trautvain Anna , Yadykina V. , Mulenko E.
Published: June 2020

the article presents the results of testing asphalt samples based on activated mineral powder from silica-containing raw materials. Activated filler was obtained by joint grinding of waste wet magnetic separation (WMS) of ferruginous quartzites of the Kursk Magnetic Anomaly in a spherical planetary mill in the presence of surfactants (stearic acid, adhesive additive Amdor-10) and bitumen. First of all, it should be noted that the use of activated mineral powder in the composition of asphalt concrete mixture led to an increase in the packing density of the composite. This was reflected not only in the technological process, but also contributed to the decrease in the porosity of the mineral core. It was found that the use of surfactants in the process of grinding mineral powder made it possible to increase the strength of asphalt concrete samples. However, the change in the crack resistance and shear resistance of asphalt concrete specimens, determined from the ratio of the corresponding compressive strengths, did not occur (table). This is due to the fact that there has been a proportional change in all the strength characteristics at different temperatures. Analysis of the physical-mechanical characteristics of the properties of asphalt concrete led to the conclusion that it was possible to use activated mineral powder from waste WMS as a component of asphalt concrete mixtures.
SHEET BUILDING GLASS WITH PROTECTIVE AND DECORATIVE COATINGS
Authors: Bondarenko N. , Bondarenko D. , Kochurin Dmitriy , Bragina Lyudmila , Yalovenko T.
Published: June 2020

sheet glass with decorative coatings in industrial and civil construction play an important role in improving the aesthetic properties of buildings for various purposes. An innovative technology for obtaining decorative coatings on sheet glasses using low-temperature plasma is proposed. For plasma spraying crushed in a ball mill container glass of various colors was used. The optimal parameters of the plasma spraying of glass powders on the front surface of the glass sheets were established. To increase the adhesion strength of the coating to the substrate before plasma spraying, the front surface was heat treated with outgoing plasma-forming gases. It was found that with increasing temperature of the outgoing plasma-forming gases and the time of their impact on the front surface of the sheet glass, the adhesion strength of the coating with the base increases to 6.7 MPa. The effect of the coating thickness on the strength of its adhesion to the substrate is studied. Increasing the coating thickness from 150 to 1000 µm reduces the adhesion strength from 7.5 to 3.2 MPa. Under the influence of high temperatures of arc plasma is not only an increase in the glass refractory oxides of silicon and aluminum, but also an increase in their hardness up to 15%.
ANALYSIS OF THE INFLUENCE OF THE QUALITATIVE COMPOSITION OF THE ASPHALT-CONCRETE MIXTURE ON THE MAIN PERFORMANCE CHARACTERISTICS OF ASPHALTIC CONCRETE PAVEMENT
Authors: Trautvain Anna
Published: June 2020

the paper presents an analysis of information quality assurance of production of asphalt concrete mixtures, as well as the study of the relationship of the qualitative composition of asphalt concrete mixtures and physical and mechanical characteristics of asphalt concrete pavement. The study of the main characteristics was carried out on the example of asphalt concrete type B and grade I and crushed-mastic asphalt concrete – SchMA-20. It is established that the deviation of asphalt mixtures in composition from the required values leads to their under-compaction in the pavement. It is also established that increasing the number of inconsistencies in the asphalt concrete mixture leads to an increase of physical-mechanical characteristics that differ from the requirements of GOST 9128-2013 and GOST 31015-2002 respectively. As an information base for the assessment of the influence of granulometry of the mineral part of asphalt concrete, as well as the amount of bitumen on the main characteristics of asphalt concrete, the data of the current ACP of Belgorod region were used. Analysis of the particle size distribution was carried out using a laser analyzer of asphalt ABA7/35B. The obtained data became the basis for a further study of the influence of various parameters on the properties of asphalt mixes, as well as improving the efficiency of the asphalt mix production management system.
ANALYSIS OF THE FACTORS INFLUENCING THE CHOICE OF INSULATION SYSTEMS OF EDUCATIONAL INSTITUTIONS
Authors: Overchenko M. , Belous A.
Published: June 2020

the article raises the problem of improving the energy efficiency of buildings in operation with a constant increase in energy prices, which is now becoming increasingly important. The analysis of the design decisions of the buildings of educational institutions of Donetsk region was carried out; the main typical series of the region were highlighted and given. The issues and the factors affecting the heat and moisture characteristics of enclosing structures of educational institutions were discussed. The values of resistance to heat transfer for the most common standard series of secondary schools are given. The modeling of temperature fields of nodes of public buildings of standard series was made. The most unfavorable design solutions of serial buildings were identified by the following factors: the temperature of the inner surface of the outer enclosures and the temperature difference between the average temperature at the surface and the air temperature in the room. Possible ways of thermo-modernization of such buildings with consideration of the requirements for temperature and breathability are considered. The influence of heat-conducting inclusions on the heat-moisture regime of external enclosing structures during partial and full thermal modernization is estimated. The analysis of various methods and ways of warming the buildings of educational institutions are performed. The advantages and disadvantages of the proposed options from an economic point of view are indicated, as well as on the basis of the requirements of fire regulations.
TRUSS DESIGN CALCULATION
Authors: Yur'ev A. , Zin'kova V. , Soliman Ata El'-Karim
Published: June 2020

the completeness of the truss design calculation is its configuration and dimensions when specifying the type of loading, material characteristics and directive dimensions. The problem of equilibrium stability with an unknown location of compressed rods hindered the optimization of the topology and geometry of the truss. The proposed variational method of truss synthesis is based on the principle of possible operation and generalization of the variational principles of Lagrange and Castigliano by expanding the functional space of geometric parameters. The solution of a physically linear isoperimetric problem for a given volume of the truss material allowed to establish its quasi-equal stress, which became the design criterion for the formulation of the geometry optimization problem. Its condition is the stationarity of the functional with respect to variable geometric parameters for a given flexibility of compressed rods. The iterative procedure, caused by a change in the initially accepted signs of longitudinal forces, is based both on their direct adjustment and on the change in the flexibility of individual rods. The global minimum of potential strain energy of the optimal truss is accompanied by a global minimum of material consumption. The proposed software allows to conduct automated design calculation of the truss. An example of designing a mechanical truss is considered.
ANALYSIS OF THE CAUSES OF ACCIDENTS AT DIFFERENT STAGES OF LIFE CYCLE OF THE CONSTRUCTION OBJECT
Authors: Lapina A. , Ponomarenko A. , Shencova K. , Kotesova A.
Published: June 2020

the article deals with the main causes of accidents of buildings and structures that occurred due to errors made at different stages of their life cycle (design, construction, operation). A brief analysis of the accidents that occurred from 2010 to 2017 in the Russian Federation is presented. The study of the causes of accidents makes it possible to understand better the laws of structures, buildings and structures, to identify errors that lead to emergencies. Such errors include: low quality of construction and installation works, deviation from the project in the construction of buildings and structures, the use of materials of inadequate quality, overload of load-bearing structures during operation. Also, the causes of accidents include defective engineering-geological and hydrogeological studies of the grounds. Analysis of accidents showed that the last few years there is no tendency to reduce the number of accidents of buildings and structures, which indicates an insufficient number of measures to prevent them. In the article the authors consider the examples of accidents in construction, which occurred due to the main reasons, and ways to prevent accidents in the future.
IMPROVING THE EFFICIENCY OF FIBRE CONCRETE PRODUCTION
Authors: Nelyubova V. , Babaev V. , Alfimova Nataliya , Usikov S. , Masanin O.
Published: June 2020

fiber concrete is one of the types of effective building materials that ensure the operational reliability of structures due to a set of unique properties. However, the maximum physicomechanical characteristics of this type of products are achieved only if the fiber is evenly distributed in the concrete matrix and the optimum ratio of raw materials is reached. In this connection, the aim of the work was to increase the production efficiency of fiber-reinforced concrete by optimizing the formulation and technological parameters of its manufacture. The optimal method of introducing the fiber into the concrete mix and the type of superplasticizer were previously determined, which allowed ensuring the maximum physicomechanical characteristics of the products. Optimization of prescription parameters was carried out using the method of mathematical planning of the experiment, where the amount of cement, superplasticizer and basalt fiber were varied. After processing the results, the dependences of the compressive strength on variable factors were obtained, which would allow to select the optimal dosages of raw materials for given mechanical characteristics of the products.
CALCULATION OF THE SLEEVE PACKER ELEMENT WITH THE VARIABLE ANGLE OF LAYING OF THREADS OF THE CORD FOR CREATION OF EDGE PROTECTION (PART 2)
Authors: Serdyukov N. , Ryzhenko E. , Smirnov Yu. , Mashkov A.
Published: June 2020

in the presented part of work the case with the angle of laying variable longwise of the reinforcing threads of a packer element in median and edge zones is investigated. Calculation of power characteristics of a cover of a packer element with various slopes is carried out. Tests of natural prototypes of covers the packer elements are carried out. The calculation results compared with data of an experiment are presented in the form of schedules with good degree of convergence. The developed technique allows to choose an optimum design of covers of a packer element with higher value of rigidity on face sites that ensures reliable functioning of a packer element at pressure differences in annular space.
Apakah literasi keuangan memengaruhi perilaku konsumsi generasi Z?
Authors: Sustiyo Joko
Published: June 2020

Abstrak

Tujuan penelitian ini untuk mengetahui pengaruh literasi keuangan terhadap perilaku konsumtif. Penelitian ini menggunakan pendekatan kuantitatif. Mahasiswa Program Studi DIII Akuntansi Jurusan Akuntansi Politeknik Keuangan Negara STAN adalah responden yang merupakan representasi generasi Z. Analisis data menggunakan analisis deskriptif dan analisis regresi. Hasil penelitian menunjukkan dua hal sebagai berikut, (1) capaian tingkat literasi keuangan mahasiswa adalah 62%, (2) literasi keuangan berpengaruh negatif secara signifikan pada perilaku konsumtif. Dengan demikian, perilaku konsumtif generasi Z dapat diminimalisir melalui peningkatan literasi keuangan.

Abstract

This study is to determine the effect of financial literacy on consumer behavior by using a quantitative approach. The subjects of this research were students of the Accounting Study Program Department of Accounting, STAN State Polytechnic who are representatives of generation Z. Descriptive and regression to analyze. The results are, (1) the level of student financial literacy is 62%, (2) financial literacy has a significant negative effect on consumer behavior. Thus, the generation Z consumptive behavior can be minimized through increased financial literacy.
Earnings management, corporate social responsibility and corporate governance in Indonesian banking industry
Authors: Supardi Supardi , Setyapurnama Yudi Santara
Published: June 2020

Abstract

This paper describes the research which investigates the moderating effect of corporate governance (CG) on the relationship of earnings management (EM) practices and corporate social responsibility (CSR) disclosure in companies listed on the Indonesia Stock Exchange. EM used in this study is the different between discretionary realized security gain or loss and discretionary loan loss provition. Data is obtained by purposive sampling process with a total sample of 138 out of 46 banking sector companies. The results showed that EM had not effect on CSR and audit committee has a negative effect on CSR, but independent commissioner does not affect CSR if tested together with EM.
Determinan ketepatan waktu pelaporan keuangan perusahaan pertambangan indonesia
Authors: Tifanny Tifanny , Rahayu Sri , Yustien Reni
Published: June 2020

Abstrak

Penelitian ini bertujuan untuk menganalisis pengaruh debt to equity ratio profltabilitas, pergantian auditor dan ukuran perusahaan terhadap ketepatan waktu pelaporan keuangan. Perusahaan pertambangan yang terdaftar di Bursa Efek Indonesia pada tahun 2014-2017 dipilih sebagai populasi penelitian. Metode pengambilan sampel adalah purposive sampling. Data dianalisis dengan regresi logistik. Hasil penelitian menunjukkan bahwa secara parsial, profitabilitas dan pergantian    auditor memengaruhi ketepatan waktu pelaporan keuangan sedangkan variabel debt to equity ratio dan ukuran perusahaan tidak memeengaruhi ketepatan waktu pelaporan keuangan.  Secara simultan keseluruhan variabel independen berpengaruh terhadap ketepatanwaktuan pelaporan keuangan.

Abstract

This study aims to analyze the effect of debt to equity ratio, profitability, auditor switching and size on the timeliness of financial reporting. Mining companies listed on the Indonesia Stock Exchange in 2014-2017 were selected as the study population. The sampling method is purposive sampling. Data were analyzed by logistic regression. The results showed that profitability and auditor turnover affect the timeliness of financial reporting. Debt to equity ratio and size do not affect the timeliness of financial reporting. Simultaneously, all of independent variable affected on the timeliness of financial reporting.
MENGINTIP KONDISI PERUSAHAAN MELALUI “GOING CONCERN”
Authors: Sasongko Hendro , Mulyaningsih May , Harefa Obed Fernando
Published: June 2020

The research sample consisted of 3 companies with a five year observation period. This research purposed to examine the effect of financial health and company growth on going concern audit opinion either partially or simultaneously. The population of this research is six cement sub-sector companies listed on the Indonesia Stock Exchange from 2013-2017. Data is processed with the Altman Z Score using Binary Logistic Regression analysis tools. The test results show that the financial health condition of the company, which is proxied by the Altman Z Score, significantly influences the acceptance of going concern audit opinion. Company growth, which is proxied by the Sales Growth Ratio, has a significant effect on ongoing concern audit opinion. The condition of financial health and company growth jointly influence the acceptance of going concern audit opinion.
Análisis de efectividad del modelo económico boliviano (2006-2019)
Authors: Burgoa Terceros Rodrigo Alfonso
Published: June 2020

El documento analiza la efectividad del modelo económico que se instauró en Bolivia el año 2006 y que tuvo una vigencia de casi 15 años. Para ese propósito, se evaluó el efecto del paradigma sobre seis indicadores de la economía boliviana: nivel deproducción, exportaciones, diversificación económica, ingreso per cápita, desarrollo humano y medio ambiente. En ese sentido, siguiendo la metodología de control sintético, se construyó una “Bolivia sintética” a partir de la información de 100 países en el período 1991-2017. Se encontró que el modelo tuvo efectos muy modestos en el nivel de producción y el ingreso per cápita, casi nulos en el desarrollo humano y negativos en la diversificación económica, las exportaciones y el medio ambiente. De esa manera, se demostró la inefectividad del modelo económico boliviano; la mejora de los indicadores en los últimos tres lustros se debió al entorno externo favorable, principalmente.
Multiplicador de inversión pública durante el auge y declive de precios internacionales
Authors: Alarcon Gambarte Samuel
Published: June 2020

La presente investigación tiene por objeto la medición del multiplicador fiscal de la inversión pública y sus cambios ante períodos de auge y declive de precios externos. Se utiliza por primera vez el método de proyecciones locales con variables instrumentales en base a Ramey y Zubairy (2018) para el caso de la economía boliviana. Los resultados presentan un multiplicador de inversión pública acumulado de 0.72 hasta el trimestre 12. Asimismo, el multiplicador es de 0.19 al trimestre 12 y 0.97 al trimestre 7 para períodos de auge y declive, respectivamente. Se concluye que el multiplicador es positivo y menor a la unidad; sin embargo, cuando la economía experimenta buenos (malos) precios internacionales, el efecto multiplicador de la inversión pública es menor (mayor) de lo que sugiere una disminución (incremento) de la eficiencia en el gasto de capital del Gobierno.
Modelo de riesgo competitivo en los “Senior Workers”: evidencia del mercado laboral chileno
Authors: Vera Rivera Carolina
Published: June 2020

La composición etaria del mercado laboral ha cambiado en las últimas décadas, generando un aumento significativo en los trabajadores mayores de 50 años. En este documento se analizan los patrones dentro del mercado laboral de los trabajadores que se encuentran cerca o en la edad de jubilación, denominados “Senior Workers”, ante la presencia de un shock exógeno de destrucción de empleo. Se genera un aporte a la literatura existente para identificar las características de la reinserción laboral hacia distintos vectores de salida de este conjunto de la población. Se utilizaron datos de la Encuesta de Protección Social de los años 2004-2015 de Chile para aplicar el Modelo de Riesgo Competitivo, y se encontró que los desempleados senior tienen menor probabilidad de encontrar un empleo formal que los trabajadores menores de 50 años, y que esto se agudiza a medida que se acercan a los 60-80 años. Se analizaron brechas de género, edad y se realizaron comparaciones con otros modelos de duración.