bluuebunny/crossref_metadata_2025 huggingface dataset:
Wear and Adhesion Properties of High-Pressure Torsion Processed Carbon Steel
Authors: Kato Hirotaka , Yamashita Kouhei , Todaka Yoshikazu
Published: June 2020

High-pressure torsion (HPT) is one of the most promising methods employed to fabricate ultra-fine grained (UFG) materials for use in industrial applications. The aim of this work is to investigate the tribological behavior of UFG carbon steels produced by an HPT. In cases where the counter ball material was tungsten and cobalt cemented carbide (WC-Co), the wear rate (0.2~2.0x10-7 mm2/N) decreased with increasing the Vickers hardness (Hv200~650) for both HPT processed and quenched-tempered (QT) steels. On the other hand, in cases where the counter ball material was high carbon-chromium bearing steel (SUJ2), the wear rate of HPT (1.0~2.5x10-6 mm2/N) increased with increasing the hardness, which was an abnormal wear behavior. There was a tendency that the wear rate increased with an increase of the coefficient of friction, and that the coefficient of friction of HPT was 13-18 % higher than that of QT. Moreover, the adhesion force of HPT was 6-7 times higher than that of QT. Thus we have concluded that the high wear rate of HPT steels in the case of the SUJ2 ball wear tests were due to the high coefficient of friction as a result of the high adhesion force, which was caused by the high density of the grain boundaries in the UFG materials.
Formation of TiO2 Thin Film on Antibacterial Metal Injection Molding Stainless Steel Orthodontic Bracket 17-4 PH Using Physical Vapor Deposition Method
Authors: Supriadi Sugeng , Ovilia Annisa , Ilmaniar Nurul , Suharno Bambang
Published: June 2020

This study aims to equip orthodontic bracket SS 17-4 PH fabricated using metal injection molding with antibacterial properties. This can be achieved by applying TiO2 coating on the surface of brackets using magnetron sputtering PVD method. This method is chosen due to its compatibility to be used on bulk metal and its ability to control thin-film stoichiometry. Samples were prepared using the series of following steps which comprised of metal injection molding, binder elimination with solvent and thermal debinding, sintering in vacuum and argon atmosphere, electropolishing, and magnetron sputtering PVD coatings as the final stage. Negative bias, sputtering power, and partial pressure on vacuum chamber were set as the constant parameters. The atmosphere inside the PVD chamber was controlled using oxygen and argon gases. XRD and SEM observations were carried out to obtain the information on the phase and morphology of the films. Rutile and anatase crystalline structures with 2,27 nm and 9,78 nm crystal size were measured in as-deposited PVD TiO2 respectively. The deposition films were achieved in the range of 3 μm-8 μm.
The Mechanical Properties of Sisal/PMMA and Sisal/Carbon/PMMA Biomedical Composites
Authors: Sosiati Harini , Binangun Yuda Aria , Utama Arya Putra , Sudarisman Sudarisman
Published: June 2020

Sisal, carbon, and poly-methyl methacrylate (PMMA) are the component materials that have been developed for the biomedical composite. However, characterization of the mechanical properties of the composites affected by some modified treatments is still opened for discussion. Sisal/poly-methyl methacrylate (PMMA) and sisal/carbon/PMMA composites with 30% fiber content and 6 mm fiber length were manufactured using a cold press molding at room temperature for about 60 min curing time. Tensile and bending properties of the composites were investigated by the influence of alkalization, the addition of maleic-anhydride-grafted polypropylene (MAPP) and hybridization of sisal and carbon fibers. The results indicated that the addition of MAPP (3, 5 and 10 wt. %) increases the tensile and flexural strengths of sisal/PMMA composites which are higher than the composites reinforced with alkali-treated and untreated sisal fibers. The addition of 5 % MAPP resulted in more effective improvement in mechanical properties compared to the effect of alkalization. However, a significant enhancement of tensile properties was shown by the hybridization effect of sisal and carbon with a ratio of 1:1 and 1:2 in sisal/carbon/PMMA composites. Scanning electron microscopy (SEM) of tensile fracture surfaces confirmed the presence of a functional relationship between the high mechanical strength of the composites with excellent adhesion between sisal fiber and PMMA by introducing 5% MAPP. Relatively homogeneous fiber dispersion in the matrix either sisal fibers or mixed sisal and carbon fibers within the PMMA matrix with sisal/carbon ratio of 1:2 have also contributed to the improvement of the mechanical strength. The use of alkali-treated sisal and HNO3-treated carbon fibers had promoted a remarkable increase in tensile strength of the sisal/carbon/PMMA hybrid composites.
The Measurement of Shrinkage: Influence of Specimen Size
Authors: Alexa Martin , Kucharczyková Barbara , Kocáb Dalibor , Halamová Romana
Published: June 2020

The paper deals with the experimental determination of the development of shrinkage and mass losses during concrete maturation. Three types of concrete mixtures were prepared for the experiment. The shrinkage measurement was designed to measure the relative length changes along the central axis of the test specimens. The main aim of the experiments was the comparison of the shrinkage and mass loss values using specimens of different dimension. One set of each concrete contained specimens with the dimensions of 100×60×1000 mm. The other set contained specimens with the dimensions of 50×50×300 mm. The measurement of shrinkage and mass losses started approx. 1 hour after the fresh concrete was placed into the moulds. The relative length changes were recorded continuously using an inductive sensor during the first 48 hours of maturation. After the 48 hours, the specimens were demoulded and a long-term measurement was performed manually using a mechanical strain gauge. The outcome of the experiment is an analysis of the influence of specimen size on the resulting curve and values of shrinkage and mass losses.
Wind Speed Effect on the Time Available for Compaction of Warm Mix Asphalt (WMA)
Authors: Hashim Wardati , Mustapa Nur Syahirah  Fatinah , Arshad Ahmad Kamil , Shaffie Ekarizan , Md Noh Nur Ilya Farhana
Published: June 2020

High demand for new asphalt pavements often requires that paving is to be done in an unfavourable condition such as low air temperatures, high wind speeds, and night construction that will affect the Time Available for Compaction (TAC). In local practice, the asphalt paving compaction control mechanisms quoted from the locally used specifications are normally based on the limits of the delivery and laying completion temperatures. This study was conducted which aim to determine the appropriate TAC of Warm Mix Asphalt (WMA) with the effect of different wind velocity using laboratory tests. It focused on WMA Asphaltic Concrete (AC)14 of mix type for wearing course and AC28 of mix type for binder course. Sample of WMA was prepared in a slab mould instead of typical round mould, which was used to resemble the shape of actual pavement. The different wind velocity was simulated by the fan located at different distance from the sample. The results indicated that the cooling rate of WMA is significantly affected by the wind velocity thus influencing the Time Available for Compaction (TAC), which decrease in average by 10-50% during windy days.
Pilot Study of Mechanical Waves Passing through Fine-Grained Cement Composite during the Early Hydration Process
Authors: Hoduláková Michaela , Topolář Libor , Kucharczyková Barbara
Published: June 2020

The aim of this paper is to present results of an experimental analysis focused on the mechanical waves passing through fine-grained materials, prepared from the CEM I 52.5 R Portland cement and the water coefficient w/c = 0.40, during the setting and hardening phase. In the experiment differences in the wave propagation in cement pastes and mortars were investigated. After mixing, both materials were poured into a cylindrical mould with the diameter of 75.0 ± 0.3 mm. These test specimens were then used to observe, in particular, the development of the amplitude of mechanical waves using a measuring setup which was composed for this purpose from the equipment of the Brno University of Technology. The results show that the time of „critical changes" in the internal structure of the material can be determined. These changes are related to the quality of the bonds of the particles in the internal structure which are reflected in the propagation of the mechanical waves within the material. It is also expected that the experimental analysis will help extend the knowledge of mechanical waves propagation in cement-based composite materials during setting.
Study of Machining Parameter Optimization in Drilling of Magnesium Based Hybrid Composites Reinforced with SiC/CNT
Authors: Babu J.S.S. , Heo Min , Kang Chung Gil
Published: June 2020

Recently, researchers and engineers have been interested in the development of hybrid metal matrix composites (HMMCs) for the applications of automotive and aerospace industries owing to their superior properties due to the usage a wide range of material combinations in its manufacturing. The present study focuses on the machining of magnesium based hybrid composites reinforced with CNT (1vol.%) and SiC (2vol.%).The influence of machining parameters such as spindle speed, feed rate, drill diameter and point angle on burr formation and surface roughness on drilling the composites were investigated using Taguchi method. The drilling parameters were optimized by using ANOVA experimental design and also find out the percentage of contribution of each factor. Based on the results, the most influential factor for the burr thickness was spindle speed and point angle. While spindle speed and feed rate were the influencing factors for surface roughness. The analysis revealed that burr height, burr thickness, and surface roughness decreases significantly with an increase in spindle speed.
Semi-Solid Forging of Mg Alloy AZX1311 and Mechanical Properties
Authors: Nishida Shinichi , Hagiwara Makoto , Tsunoda Kentaro , Nakanishi Ryoma , Tanaka Tatsuya , Haga Toshio
Published: June 2020

This paper describes basic property in semi-solid forging method of magnesium alloy AZX1311. In the semi-solid forging process, an arbitrary fraction of solid is selected at a temperature between the liquidus and the solidus line and rapidly cooled and coagulated simultaneously with deformation of the material in a die to obtain a product. In addition, the magnesium alloy AZX1311 has excellent castability and mechanical properties. In recent years, the use of magnesium alloys for home electric appliances and automotive parts has been increasing because weight reduction can be achieved. These main manufacturing methods are casting and forging. However, these manufacturing methods have disadvantages such as large forming load and poor dimensional accuracy. Therefore, the semi-solidification forging method can improve these disadvantages. In this study, a forged semi-solid material and air cooled semi-solid material were produced using a servo press machine. Focused on impurities, porosity and microstructure. A forged semi-solid material could be produced. A semi-solid structure could be observed.
Effect of Space Holder Size on the Porous High Purity Aluminum Property
Authors: Khamsuk Sunisa , Choosakull K. , Wanwong P.
Published: June 2020

Porous high purity aluminum was fabricated using a powder metallurgy route combined with the space holder technique. The high purity aluminum powder was mixed with three different particle sizes and contents of the space holder material. The mixed powders were cold compacted at 400 MPa and sintered at 550 °C. The effects of space holder size on the microstructure and mechanical properties of porous high purity aluminum were systematically studied. Results revealed that the size and content of the space holder materials have a significant effect on the mechanical properties of porous aluminium. The compressive strength and hardness of the porous aluminum increased as the size and amount of the space holder material increased and decreased, respectively. The thickness of the cell wall increased with an increase particle size of the space holder material.
Machining Parameters Mapping’s of Inconel 718 and Aluminum Alloy 1100 in Micro-Milling Process
Authors: Kiswanto Gandjar , Azmi Maulana , Mandala Adrian , Zariatin Dede Lia , Ko Tae Jo
Published: June 2020

The development of micro-products in industry, like aviation, medical equipment, electronics, etc, has been increasing lately. The need for scaling down of product has been increasing to make the product simpler and complex. Micro-milling has capabilities in producing complex parts. In this study, mapping and comparing the result of the machining process of Inconel 718 and Aluminum Alloy 1100 was employed. In this experiment, Inconel 718 was used as workpiece material and the result of Aluminum Alloy taken from recent studies. Then, A cutting tool with a diameter 1 mm carbide coating TiAlN was used in this experiment. The machining process was performed with three varieties of spindle speed and feed rate with a constant depth of cut. After the machining is done, the mapping of the result surface roughness of Inconel 718 and AA1100 performed. It was found that Inconel 718 has poor machinability compared with AA 1100. Inconel 718 also has a high manufacturing cost compared to AA 1100 because the cutting tool was easy to wear.
Effect of Polylactic Acid/Hydroxyapatite Coating on Dental Implant Using Finite Element Method
Authors: Mas Ayu Hassan , Mustaqieem M.M. , Daud Rosdi , Shah A. , Arafat Andril , Dambatta M. S.
Published: June 2020

Finite element analysis (FEA) has been proven to be a precise and applicable method for evaluating dental implant systems. This is because FEA allows for measurement of the stress distribution inside of the bone and various dental implant designs via simulation analysis during mastication where such measurements are impossible to perform in-vitro or in-vivo experiment. That is why the relationship between implant design and load distribution at the implant bone interface is a crucial issue to understand. This research study focuses on a static simulation and bonding strength for PLA/HA coating on V thread design of dental implant using three-dimensional finite element. The average masticatory muscle that involves in human biting such as X, Y and Z direction will be used to simulate force with load condition of 17.1N, 114.6N and 23.4N respectively. Based on result obtained, the coated dental implant model is more compatible than uncoated model due to lower maximum stress which is reduce about 16%. The coated model also shows lower deformation and higher bonding strength. Outcomes from this research provide a better understanding of stress distribution characteristics that would be useful in order to improve design of dental implant thread and evaluation of the PLA/HA bonding strength applied.
Protein Nanoparticles with Enzymatic and Antigen-Binding Activities Induce Th1 Cytokine Gene Expression
Authors: Morozova Olga V. , Isaeva Elena I. , Klinov Dmitry V.
Published: June 2020

To improve protein stability and membrane permeability the protein nanoparticles (NP) were fabricated from enzymes or virus-specific antibodies by nanoprecipitation. Lysozyme NP destroyed bacterial cellular walls. RNase-based NP hydrolyzed RNA. Lipase, catalase and horseradish peroxidase activities were also registered for corresponding protein NP. NP from polyclonal antibodies against the influenza A virus and monoclonal antibodies against hemagglutinin H1, H3; proteins NS and NP could interact with their specific antigens. NP from monoclonal antibodies against the hepatitis B surface antigen bound with the antigen as shown by ELISA. The protein NP were stable in water at 4°C for several months and in the presence of blood sera or saliva for more than 5 days. The protein NP were not toxic for human cells and mice. The protein NP could penetrate and accumulate in cells in 2 hours with maximum after 2 days and subsequent gradual decline until background values. Entry of foreign protein NP into the eukaryotic cells induced cytokine gene expression. RNA of interferon (IFN) a, b and l but not IFN g were detected by reverse transcription with real time PCR. Polarization index (Th2:Th1 cytokine RNA) was near 0. Accordingly, cellular uptake of non-toxic protein NP induced Th1 polarization of immune response.
Validation of Micromechanical Model for Prediction of ITZ Thickness of High-Strength Concrete Containing Secondary Cementitious Materials
Authors: Bily Petr , Nežerka Václav , Hrbek Vladimír , Fladr Josef
Published: June 2020

The mechanical properties of a cementitious composite are strongly affected by interfacial transition zone (ITZ) between the matrix and the aggregates, mainly by its strength and thickness. A micromechanical model based on Mori-Tanaka scheme coupled with an estimation of deviatoric stress in ITZ was developed for evaluation of the effect of selected secondary cementitious materials (SCMs – silica fume, fly ash and metakaolin) on the properties of ITZ in high-strength concrete (HSC). The model was validated by means of comparison of predicted ITZ thickness with direct ITZ thickness measurements performed by a combination of scanning electron microscopy and grid nanoindentation. Very good agreement between the theoretical and experimental results was reached, therefore the developed micromechanical model can be used for further research and optimization of HSC containing SCMs. Silica fume was determined to be the most efficient supplementary cementitious material from the point of view of ITZ thickness reduction.
Research on Preparation and Properties of Nylon 66/MMT/MWCNT Nanocomposites by In Situ Polymerization
Authors: Duan Xiao Chao , Wu Yang Peng , Yang Tong Hui , Cheng Yong Chang , Huang Tao , Yu Hao
Published: June 2020

The MWCNT-COOH and CTAB modified MMT were hybridized by the ultrasonic method, and the nylon 66/MMT/WMCNT composite was prepared by in-situ polymerization to study the effect of the introduction of MMT and MWCNT on the properties of nylon 66. A scanning electron micrograph of the composite cross-section shows that the CNTs were uniformly dispersed in the nylon 66 matrix. The XRD patterns show that the introduction of MMT and MWCNT-COOH caused the ratio of α1 and α2 of nanocomposites. The TGA results show that the heat resistance and residual carbon content of the composite material are improved. The mechanical properties of nanocomposites show that the mechanical properties of the material are improved relative to pure PA66.
Efficient Modeling of the Thermal-Cracking of a Spherical Shell Encapsulating a Round Inclusion
Authors: Zéhil Gérard Philippe
Published: June 2020

A simple and efficient computational tool modeling the brittle thermal-cracking behavior of a spherical shell encapsulating a round inclusion is presented and compared to existing numerical techniques. Model applications to parametric studies and to particulate composite materials are proposed.
Thermal Conductivity and Crystallography of Polypropylene/Polycarbonate/ Polypropylene-Graft-Maleic Anhydride Polymer Blend
Authors: Mat Shayuti Muhammad Shafiq , Sharudin Rahida Wati , Tengku Mohd Tengku Amran , Khamaruddin Putri Nadzrul Faizura Megat , Abdullah Mohamad Zaki , Yusoff Puteri Sri Melor Megat
Published: June 2020

The effect of blending polycarbonate (PC) into polypropylene (PP) matrix polymer on thermal conductivity and crystal structure was studied. The blends consisted of 5% to 35% of PC with 5% compatibilizer (polypropylene-graft-maleic anhydride or PP-g-MA), were compounded using twin-screw extruder and shaped into standard tests samples by compression molding. The thermal conductivity values for PP/PC/PP-g-MA blends were ranging from 0.22 – 0.24 W/m.K. When compared to Hanshin – Shtrikman model, the highest difference in the thermal conductivity values was 28.2% shown in 90/5/5 composition. The deviation was due to the exclusion of factors such as PC particulates’ geometry, size, and dispersion in PP matrix. X-ray Diffraction (XRD) test revealed the blends’ structures comprised of medium-range order domains, referring to imperfect crystals with nanoparticles. The locations of peaks in the XRD spectrum also suggest that the pure PP’s monoclinic alpha crystal appeared in all PP/PC/PP-g-MA blends and there was no other crystal obtained in the blends. From the result, the discovered traits of crystal structure displayed influence on the thermal conductivity of the blends. At the same time, reactive compatibilization was suspected to take place at the interface of PP and PC phases when PP-g-MA was introduced.
Efficiency Improvement of Gelatin-Based Wound Dressings by Silk Fibroin and Chitosan
Authors: Wattanutchariya Wassanai , Thunsiri Kittiya , Puntawang Suwichchaya
Published: June 2020

Wound healing is a natural process of human body. When the wound size exceeds the critical point for naturally body healing, the fibrous tissue will play their parts and created a scar. Therefore, extra treatment has been added to eliminate the body limitations. Currently, there are a lot of commercial bioactive wound healing and dressing due to its physiological and biological abilities. In wound healing process, high moisture condition is also required. In order to accelerate the wound healing process, Tissue engineering (TE) is recommended. The increasing of cell proliferation by TE will be increased the chance for wound healing acceleration. In this study, the combination of Gelatin (Gel), Chitosan (CS) and Silk Fibroin (SF) were varied mixed in 10 ratios and fabricated the structure by lyophilisation technique. The elastic ability, biodegradability, structure and pore morphology, porosity, swelling ability, and biotoxicity were observed in each ratio. Gel provided highest elastic ability and biodegradability. The addition of SF and CS in Gel decreased biodegradation rate and activate fibroblast cell proliferation. Therefore, CS and SF could increase efficiency of gelatin-base wound dressings for a variety of utilization.
Placental Myeloid Cells Protect against Zika Virus Vertical Transmission in a Rag1-Deficient Mouse Model
Authors: Winkler Clayton W. , Evans Alyssa B. , Carmody Aaron B. , Peterson Karin E.
Published: June 2020

The ability of Zika virus (ZIKV) to cross the placenta and infect the fetus is a key mechanism by which ZIKV causes microcephaly. How the virus crosses the placenta and the role of the immune response in this process remain unclear. In the current study, we examined how ZIKV infection affected innate immune cells within the placenta and fetus and whether these cells influenced virus vertical transmission (VTx). We found myeloid cells were elevated in the placenta of pregnant ZIKV-infected Rag1−/− mice treated with an anti-IFNAR Ab, primarily at the end of pregnancy as well as transiently in the fetus several days before birth. These cells, which included maternal monocyte/macrophages, neutrophils, and fetal myeloid cells contained viral RNA and infectious virus, suggesting they may be infected and contributing to viral replication and VTx. However, depletion of monocyte/macrophage myeloid cells from the dam during ZIKV infection resulted in increased ZIKV infection in the fetus. Myeloid cells in the fetus were not depleted in this experiment, likely because of an inability of liposome particles containing the cytotoxic drug to cross the placenta. Thus, the increased virus infection in the fetus was not the result of an impaired fetal myeloid response or breakdown of the placental barrier. Collectively, these data suggest that monocyte/macrophage myeloid cells in the placenta play a significant role in inhibiting ZIKV VTx to the fetus, possibly through phagocytosis of virus or virus-infected cells.
Arbeitsgemeinschaft: Elliptic Cohomology according to Lurie
Authors: Goerss Paul G. , Lurie Jacob , Nikolaus Thomas
Published: June 2020

In this collection we give an overview of Jacob Lurie’s construction of elliptic cohomology and Lubin Tate theory. As opposed to the original construction by Goerss–Hopkins–Miller, which uses heavy obstruction theory, Lurie constructs these objects by a moduli problem in spectral algebraic geometry. A major part of this text is devoted to the foundations and background in higher algebra needed to set up this moduli problem (in the case of Lubin Tate theory) and prove that it is representable.
Mini-Workshop: Recent Progress in Path Integration on Graphs and Manifolds
Authors: Güneysu Batu , Keller Matthias , Kuwada Kazumasa , Thalmaier Anton
Published: June 2020

Ever since Richard Feynman’s PhD thesis, path integrals have played a decisive role in mathematical physics. While it is well-known that such formulae can hold only formally, it was Mark Kac who realized that by replacing the unitary group by the heat semigroup, one obtains well-defined and rigorous formulae. Following this pioneering work, Feynman-Kac path integral formulae have been adapted to several situations and generalized into several directions providing the central focus of this workshop.
Combinatorics, Probability and Computing
Authors: Krivelevich Michael , Riordan Oliver M. , Steger Angelika
Published: June 2020

The main theme of this workshop was the use of probabilistic methods in combinatorics and theoretical computer science. Although these methods have been around for decades, they are being refined all the time: they are getting more and more sophisticated and powerful. Another theme was the study of random combinatorial structures, either for their own sake, or to tackle extremal questions. The workshop also emphasized connections between probabilistic combinatorics and discrete probability.
ОҚУШЫЛАРДЫҢ ШЫҒАРМАШЫЛЫҚ ҚАБІЛЕТІН ДАМЫТУДАҒЫ БИОЛОГИЯНЫҢ МАҢЫЗЫ
Authors: Amanzholova Alina
Published: June 2020

В этой статье обсуждается роль биологии в развитии творческих способностей учащихся, позволяющая решить одну или несколько проблем в результате высоких познавательных действий с помощью модели учебного материала учащегося
A novel approach of determining the parameters of Asadi profiling function for predictiong ground subsidence due to inclied coal seam mining at Quang Ninh coal basin
Authors: Nguyen Long Quoc ,   Long Quoc Nguyen Faculty of Geomatics and Land Administration, Hanoi University of Mining and Geology, Vietnam
Published: June 2020

In this paper, we proposed a novel approach for estimating preliminary values of parameters of the Asadi profiling function (APF), then the least-squares principle was used with these preliminary values and ground subsidence monitoring data at the Thong Nhat underground mine to determine to the final parameters of the APF. This function was employed to predict ground subsidence at the Mong Duong mine where there are geological and rock geomachenial conditions well as seams’ inclination similar to those of Thong Nhat mine. The results show that the Rood Mean Square Error (RMSE) and Mean Absolute Error (MAE) equal to 0.081 m and 0.055 m or 9.9% and 6.7% of maximum subsidence, respectively, and a correlation coefficient of 0.973. These results prove that the APF with calculated parameters can be used to predict ground subsidence due to underground mining in the areas that have the similar conditions to Thong Nhat mine.
უმაღლეს საგანათლებლო დაწესებულებებში აკადემიური პერსონალის შერჩევის თავისებურებები
Authors: Gulua Ekaterine
Published: June 2020

ეკატერინე გულუა
ეკონომიკის დოქტორი,
ივანე ჯავახიშვილის სახელობის თბილისის
სახელმწიფო უნივერსიტეტის ასისტენტ-პროფესორი
საქართველო, თბილისი
E-mail: ekaterine.gulua@tsu.ge
http://orcid.org/0000-0001-9484-093X
 
მოკლე აღწერა
უმაღლესი სასწავლო დაწესებულებების, უნი­ვე­რ­სი­ტე­ტე­ბის აკადემიური პერსონალი განსაზღვრავს თაობების პრ­ოფ­ეს­ი­ონალიზმის დონეს, მათ კონკურენტუნარიანობას, სა­ზო­გა­დო­ების განვითარების დონეს, რაც თავის მხრივ წარ­მო­ა­დ­გენს ცხ­ო­ვრების დონის, სიღარიბის დაძლევის,   რესურსების ეფ­ექტ­უ­რი და ეფექტიანი გამოყენების  მთავარ დეტერმინანტს. ის ას­ე­ვე მომავალი სამეცნიერო კადრების მომზადების და გრ­ძე­ლვა­დი­ანი განვითარების საფუძვლად გვევლინება.
სამყარო მუდმივად გვთავაზობს განსხვავებულ გა­მოწვ­ე­ვე­­ბს, რომელთან გამკლავებაც შესაძლებელი ხდება მხოლოდ უმ­აღლესი პროფესიონალური ცოდნის ლატერალური გა­მო­ყე­ნე­­ბის უნარის საშუალებით. ნებისმიერი სახე­ლმ­წი­ფოსთვის მნ­ი­შვნელოვანია ქვეყნის ფარგლებში შესაძლებელი გახდეს ცო­დ­ნის გავრცელება, ადამიანური პოტენციალის მაქ­სი­მა­ლუ­რი რე­ა­ლიზება. ეს კი განსაკუთრებულ მოქნილობას მოითხოვს უმ­აღლესი სასწავლო დაწესებულებების აკადემიური პე­რს­ონა­ლის მხრიდან, რომელიც უზრუნველყოფს მაღალი კვალი­ფი-კა­­ციის პროფესიონალი კადრების ჩამოყალიბებას, შრომის ბა­ზა­რზე შრომითი რესურსების მიწოდებას. შესაბამისად, აქტ­უა­ლურია აკადემიური პერსონალის ჩამოყალიბების, გან­ვი­თა­რე­ბის სტიმულირების მექანიზმების ქმედითობა, ამ მი­მა­რთ­უ­ლ­ებთ საუკეთესო გლობალური გამოცდილებებისა და ქვეყნის ში­­გნით არსებული რეალობის გათვალისწინება, რათა არ მო­ხ-დ­ეს ცოდნის ლოკალიზება, უზრუნველყოფილი იქნეს უნ­ივ­ერ­სა­ლური, უახლესი ცოდნის გადაცემა სტუდენტებისთვის.
ნაშრომში განხილულია უნივერსიტეტებში აკადემიური პე­­რსონალის შერჩევის პროცესის რეგულირების თა­ვი­სე­ბუ­რე­ბე­­ბი შერჩევის კრიტერიუმების გაუმჯობესებისა და კა­რი­ე­რუ­ლი განვითარების   ჭრილში. კონკრეტულად, შესწავლილია: შე­­რ­ჩევის დეტერმინანტები, პროცესთან დაკავშირებული გა­მო­წ­ვ­ევები, პასუხისმგებლობის, უფლებამოსილებისა და ვა­ლ­დე­ბუ­ლების საკითხები; უნივერსიტეტებში არსებული კარ­იე­რუ­ლი საფეხურები, აკადემიური პერსონალის შერჩევის კრ­იტ­ერ­იუ­მები,  შერჩევასთან დაკავშირებული პროცესების მართვის სა­კითხები და მოცემულია შესაბამისი რეკომენდაციები.
საკვანძო სიტყვები: აკადემიური პერსონალის შერჩევა, შე­რჩ­ე­ვის პროცესი, კარიეული საფეხურები, პროცედურები.
Kajian Penerapan Multi Lane Free Flow (MLFF) Di Jalan Tol Indonesia
Authors: Budiharjo Anton , Margarani Sekar Ratri
Published: June 2020

Jumlah kendaraan yang terus meningkat tidak sejalan dengan pertumbuhan pembangunanjalan di Indonesia. Mix traffic dan kemacetan sering ditemui terutama di daerah perkotaan.Jalan tol dibuat untuk mengurangi tingkat kemacetan yang terjadi. Saat ini Indonesiamenerapkan pembayaran menggunakan kartu elektronik yang pada kenyatannya masihmenyebabkan antrian kendaraan untuk bertransaksi di gerbang tol. Diperlukan adanyapembaruan teknologi yaitu menggunakan Multi Lane Free Flow. Yaitu metode pembayarantanpa berhenti dengan pengguna tidak harus menghentikan kendaraannya untukbertransaksi. Pada penelitian kali ini akan dibahas mengenai analisis penerapan Multi LaneFree Flow bila diterapkan di Indonesia menggunakan metode analisis PEST dan analisisSWOT. Dari hasil analisis PEST dan analisis SWOT dapat dikatakan bahwa Multi Lane FreeFlow layak untuk diterapkan di Indonesia dengan pemilihan teknologi yang tepat dan sesuaidengan culture dari masyarakat Indonesia.
Kajian Peningkatan Keselamatan Perlintasan Sebidang Kereta Api Grogol Di Kabupaten Tegal Study On Improving The Safety Of The Crossroads Of The Grogol Railway In The Tegal Regency
Authors: Budiharjo Anton , Yunarto Isro Febrian
Published: June 2020

Perlintasan kereta api grogol adalah perlintasan sebidang kereta api tanpa palang pintu yang rawan akankecelakaan lalu lintas akibat adanya konflik di perlintasan sebidang kereta api antara pengguna jalan dankereta api yang melintas yang berpotensi kecelakaan. Penelitian ini bertujuan memberikan rekomendasipenanganan yang sesuai dengan pedoman SK.770/KA.401/DRJD/2005 tentang Pedoman TeknisPerlintasan Sebidang Antara Jalan Dengan Jalur Kereta Api. Survei yang dilakukan pada penelitian iniadalah inventarisasi jalan untuk mengetahui geometrik pada perlintasan sebidang kereta api dan surveiperilaku pengguna jalan untuk mengetahui perilaku pengguna jalan yang melintas di perlintasan sebidangkereta api. Rekomendasi penanganan pada perlintasan sebidang kereta api grogol yang sesuai untukmeningkatkan keselamatan dan mencegah kecelakaan adalah dengan memasang palang pintu dan posjaga.
Abertura de mundo, natureza e finitude na preleção de 1929/30 de Heidegger
Authors: Ramalho da Silveira André Luiz
Published: June 2020

Este artigo apresenta a abordagem realizada por Heidegger dos conceitos de mundo, natureza e finitude a partir da prelação de 1929/30, intitulada Os Conceitos Fundamentais da Metafísica: Mundo, Finitude e Solidão. Ao concentrar e manter grande parte da problemática da ontologia fundamental elaborada em Ser e Tempo, a preleção de 1929/30 constitui-se por ser um vértice no pensamento de Heidegger, equilibrando-se entre a ontologia fundamental e os livros e preleções que vieram depois dos anos de 1930. Deste modo, ao apresentar a transformação do conceito de abertura na preleção de 1929/30, torna-se possível argumentar que Heidegger elabora um conceito de finitude oriundo da relação do ser humano com a natureza, distinto do conceito de finitude existencial pensado a partir da relação do ser humano com a possibilidade da morte. Esse conceito de finitude assinala, por sua vez, a inserção não apenas da finitude existencial, mas também da finitude de ser.
ACIDENTES DE TRABALHO POR DISTÚRBIOS OSTEOMUSCULARES REGISTRADOS NO BRASIL ENTRE 2006 E 2017
Authors: Abreu Jeniffer De Araújo , Vieira Larissa Da Silva , Comper Maria Luiza Caires
Published: June 2020

RESUMO

 

No Brasil, os distúrbios osteomusculares relacionados ao trabalho (LER/DORT) são equiparados aos acidentes de trabalho, possibilitando o recebimento de benefício-acidentário. Entretanto, é necessário obter o reconhecimento do nexo de causalidade por meio da Comunicação de Acidente de Trabalho ou do Nexo Técnico Epidemiológico Previdenciário. O objetivo foidescrever a incidência e as características dos acidentes de trabalho decorrentes de distúrbios osteomusculares ocorridos no Brasil durante o período de 2006 a 2017. Trata-se de um estudo epidemiológico, descritivo, de base populacional, com análise de dados secundários extraídos do Anuário Estatístico da Previdência Social. Os dados foram analisados por estatística descritiva. A incidência de acidente de trabalho por LER/DORT no período estudado foi de 1.214.729 casos. Houve umcrescimento entre 2006-2008 e redução progressiva nos anos seguintes. O maior número de acidentes foi registrado em2008 (n=143.169). As condições clínicas mais prevalentes foram os transtornos dos tecidos moles (CID M70-79) (42%), as osteopatias e condropatias (CID M80-M94) (27,2%) e os transtornos das sinóvias e dos tendões (M65-M68)(14,3%). A maior parte dos acidentes não tiveram emissão de comunicação de acidente de trabalho (59,21%). O comportamento da incidência e as características dos acidentes de trabalho por LER/DORT revelaram uma tendência para subnotificação e concessão de benefício-acidentário. O fortalecimento das ações de vigilância em saúde do trabalhador na Atenção Básica pode ser uma estratégia para o enfrentamento da subnotificação e implementação de políticas voltadas àprevenção de acidentesnos ambientes de trabalho.

Palavras-chaves:Acidentes de Trabalho. Saúde do trabalhador. Vigilância em Saúde do Trabalhador
Aktivitas Antagonisme Khamir Asal Daun Jati (Tectona grandis) terhadap Aspergillus sp. Asal Pakan Ayam
Authors: Widowati Retno , Sukmawati Dalia , Marham HD
Published: June 2020

Penelitian ini bertujuan untuk mengetahui potensi isolat-isolat khamir phylloplane yang berasal dari permukaan daun jati (Tectona grandis) sebagai agen pengendali hayati kapang pathogen Aspergillus sp. yang diisolasi dari pakan ternak ayam di daerah Bogor. Sebanyak 14 isolat khamir dan kapang Aspergillus sp. yang diuji merupakan koleksi UNJ Culture Collection. Metode co-culture dengan medium Potato Dextrose Broth (PDB) digunakan untuk uji antagonis khamir terhadap kapang. Pengamatan pertumbuhan khamir dilakukan dengan melihat adanya endapan, warna endapan, terbentuknya pelikel, dan perubahan pH medium. Adapun kapang diamati dengan melihat adanya hifa atau miselium, sporulasi, warna koloni dan pH medium. Hasil menunjukkan terdapat Sembilan isolat khamir yang paling berpotensi dalam menekan pertumbuhan Aspergillus sp., yaitu isolat-isolat khamir dengan kode T1D1 WU 2.2a; T3D2 DU 1.7; T4D2 WU2J2; T4P2-DU 2.1; T4D2 DU 2.1; T5D2 WU 1.5; T5D2 DU 1.1; CL1 PW1; dan T5D1 DU 2.2.
The Social Doctrine and Presence of the Catholic Church in the Media
Authors: Balabanić Ivan
Published: June 2020

The social doctrine of the Church involves greater commitment and engagement of the Church in social problems as well as the promotion of relationships that serve justice and peace. The Catholic Church first began relating mass media to its social teaching in the 19th century. As the Church aimed at a broader scope of public, it dealt with means of social communication and examined it through numerous sources – papal encyclicals, conciliar and episcopal documents. The relationship between the Catholic Church and the media is not simple. Approaches to ethics, morality, responsibility and dignity of human beings are sometimes different in media reports and in the aims of the Church in its social doctrine which should provide all members of the society with a sense of direction and instruction for everyday actions. Through the documents presented here, the Church has shown a readiness to face the media as well as the possibility to use them for advancing justice, truth, peace and freedom.
Fast Choices and Emancipatory Spaces
Authors: Paska Iva
Published: June 2020

Contemporary digital environments are increasingly changing the ways in which we live and interact. One of the fields where this is evident is the field of intimate relationships. At the beginning of the third decade of the 21st century mobile dating applications are becoming a common way of meeting potential partners. The purpose of this paper is to explore the implications of this and to look more closely how online dating in the age of mobile applications is changing the field of intimate relationships, as well as to note the complexity of this phenomenon.
Manifestation of Translation Strategies via Think-aloud Protocol
Authors: Rahnama Samaneh
Published: June 2020

This study was concerned with the effect of think-aloud method on the translation process. The aim of this study was to examine differences between translators in the implementation of Newmark’s strategies in translating general texts from English into Persian. Four students (three females and one male) majoring in Translation Studies participated in this study. The researcher used a mixed-method design. In the qualitative phase of the study, the data were collected through the think-aloud protocol, translation task, and cassette recorders. The results suggested that there was no significant difference between translators in the implementation of Newmark strategies with regard to translation tasks. During the quantitative phase of the study, the researcher examined the difference between the translators in implementing translation strategies while translating general texts from English into Persian. In this phase of the study, the data were analyzed using SPSS 19 performing Chi-square. The results of this phase proposed that there was statistically no significant difference between the four translators with regard to most of the translation strategies.
Dança e conhecimento: reflexões sobre o corpo vivido
Authors: Nascimento Marcelo De Maio
Published: June 2020

O estudo tem por objetivo abordar a epistemologia da dança, discutindo a produção e o ganho do conhecimento dançado. Os principais temas são o corpo e a motricidade, estruturados por via sensório-motora (perceptivo) durante à prática. Deste modo, o conjunto de experiências ganhas na dança são assumidas como conhecimento vivido ou corporificado, um tipo de saber que o corpo se habitua a (re)conhece como agir e se relacionar no mundo. A base reflexiva eleita para o estudo é fenomenológica a partir de filósofos internacionais da área da ciência da dança e a obra de Merleua-Ponty intitulada “Fenomenologia da Percepção”. Nessa perspectiva, o corpo além de orgânico é considerado como produto sociocultural, histórico e principal agente à efetivação da tríade sensação, percepção, ação. Enquanto que a dança é a oportunidade, que cria intencionalmente na vida dos envolvidos tempo e espaço à interpretação e significação de contextos sociais e subjetivos.
Migração no esporte: uma revisão sistemática
Authors: Nascimento Diego Ramos do , Ribeiro Carlos Henrique de Vasconcellos , Palma Alexandre , Pereira Erik Giuseppe Barbosa
Published: June 2020

O objetivo do estudo foi analisar produções acadêmicas sobre o fluxo migratório no esporte. O alicerce foi construído baseado no modelo PRISMA: identificação das obras através da seleção bibliográfica nas bases de dados Scielo, Pubmed, Lilacs, Google acadêmico e Portal Brasileiro de História, utilizando as palavras-chave “migração nos esportes” e “fluxo migratório nos esportes”; realização de leitura exploratória para seleção; elegibilidade através de leitura analítica; e, de posse dos dados organizados, inclusão dos textos na análise qualitativa. Os resultados apontam que os estudos de migração esportivas estão pautadas na visão Marxistas. Quanto aos esportes, encontramos a classificação do status momentâneo dos atletas. Outros fatores: padrões linguísticos; nível esportivo do país de destino e; número de jogadores compatriotas. Concluímos que, além das análises socioculturais, poucos trabalhos buscam relacionar desempenho e migração. Acreditamos que estudos dessa relação podem elucidar outras questões.
COVID-19 and Numeracy: How about Them Numbers?
Authors: Best Joel
Published: June 2020

Quantitative efforts to understand the emergence of the COVID-19 pandemic need to be viewed through the lens of social construction. I begin by comparing the efforts to quantitatively measure the plague in London in 1665. Then I develop five propositions for studying the social construction of statistics: (1) facts are social constructions; (2) measuring involves making decisions, (3) counting is not straightforward; (4) all comparisons involve choices; and (5) social patterns shape numbers. After examining how these propositions affect what we know about COVID-19, I consider their implications for moving beyond mathematics when approaching numeracy.
Djibouti
Authors:   International Monetary Fund. Middle East and Central Asia Dept.
Published: June 2020

The COVID-19 pandemic has considerably weakened macroeconomic prospects for Djibouti. The country is facing a large negative external demand shock due to the global recession. Domestically, virus prevention and containment measures are affecting both demand and supply. Output is contracting, while lower exports of services and foreign direct investment have opened an urgent balance of payments need of the order of US$164 million (4.8 percent of GDP). The pandemic has also created urgent spending needs and is set to reduce government revenue.
Resolving the size of ice-nucleating particles with a balloon deployable aerosol sampler: the SHARK
Authors: Porter Grace C. E. , Sikora Sebastien N. F. , Adams Michael P. , Proske Ulrike , Harrison Alexander D. , Tarn Mark D. , Brooks Ian M. , Murray Benjamin J.
Published: June 2020

Abstract. Ice-nucleating particles (INPs) affect cloud development,
lifetime, and radiative properties, hence it is important to know the
abundance of INPs throughout the atmosphere. A critical factor in
determining the lifetime and transport of INPs is their size; however very
little size-resolved atmospheric INP concentration information exists. Here
we present the development and application of a radio-controlled payload
capable of collecting size-resolved aerosol from a tethered balloon for the
primary purpose of offline INP analysis. This payload, known as the SHARK
(Selective Height Aerosol Research Kit), consists of two complementary
cascade impactors for aerosol size-segregation from 0.25 to 10 µm,
with an after-filter and top stage to collect particles below and above this
range at flow rates of up to 100 L min−1. The SHARK also contains an
optical particle counter to quantify aerosol size distribution between 0.38
and 10 µm, and a radiosonde for the measurement of temperature,
pressure, GPS altitude, and relative humidity. This is all housed within a
weatherproof box, can be run from batteries for up to 11 h, and has a total
weight of 9 kg. The radio control and live data link with the radiosonde
allow the user to start and stop sampling depending on meteorological
conditions and height, which can, for example, allow the user to avoid
sampling in very humid or cloudy air, even when the SHARK is out of sight.
While the collected aerosol could, in principle, be studied with an array of
analytical techniques, this study demonstrates that the collected aerosol
can be analysed with an offline droplet freezing instrument to determine
size-resolved INP concentrations, activated fractions, and active site
densities, producing similar results to those obtained using a standard
PM10 aerosol sampler when summed over the appropriate size range.
Test data, where the SHARK was sampling near ground level or suspended from
a tethered balloon at 20 m altitude, are presented from four contrasting
locations having very different size-resolved INP spectra: Hyytiälä
(southern Finland), Leeds (northern England), Longyearbyen (Svalbard), and
Cardington (southern England).
Southern California margin benthic foraminiferal assemblages record recent centennial-scale changes in oxygen minimum zone
Authors: Palmer Hannah M. , Hill Tessa M. , Roopnarine Peter D. , Myhre Sarah E. , Reyes Katherine R. , Donnenfield Jonas T.
Published: June 2020

Abstract. Microfossil assemblages provide valuable records to investigate
variability in continental margin biogeochemical cycles, including dynamics
of the oxygen minimum zone (OMZ). Analyses of modern assemblages across
environmental gradients are necessary to understand relationships between
assemblage characteristics and environmental factors. Five cores were
analyzed from the San Diego margin (32∘42′00′′ N, 117∘30′00′′ W; 300–1175 m water depth) for core top benthic foraminiferal
assemblages to understand relationships between community assemblages and
spatial hydrographic gradients as well as for down-core benthic foraminiferal
assemblages to identify changes in the OMZ through time. Comparisons of
benthic foraminiferal assemblages from two size fractions (63–150 and
>150 µm) exhibit similar trends across the spatial and environmental gradient or in some cases exhibit more pronounced
spatial trends in the >150 µm fraction. A range of species
diversity exists within the modern OMZ (1.910–2.586 H, Shannon index),
suggesting that diversity is not driven by oxygenation alone. We identify
two hypoxic-associated species (B. spissa and U. peregrina), one oxic-associated species (G. subglobosa) and
one OMZ edge-associated species (B. argentea). Down-core analysis of indicator species
reveals variability in the upper margin of the OMZ (528 m water depth) while
the core of the OMZ (800 m) and below the OMZ (1175 m) remained stable in
the last 1.5 kyr. We document expansion of the upper margin of the OMZ
beginning 400 BP on the San Diego margin that is synchronous with other
regional records of oxygenation.