bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of thickness of nickel film on W(110) surface upon the character of adsorption of nitric oxide molecules
Authors:   North Ossetian State University named after K.L. Khetagurov, Magkoev T.T.
Published: March 2021

Adsorption of nitic oxide molecules NO on the surface of structurally ordered 1, 2 and 3 monolayer thick nickel films deposited onto W(110) surface has been studied by means of reflection-absorption infrared spectroscopy. The structure of nickel films at all thicknesses studied corresponds to Ni(111) crystal. The IR spectra of NO molecules adsorbed on a 3 monolayer Ni film correspond to those of NO on bulk Ni(111) crystal. At lower film thickness there are differences more pronounced for a monolayer film. This is due to additional effect of underlying W(110) support upon the intramolecular NO bond, and/or to some distortion of (111) structure of monolayer film, compared to bulk Ni(111), because of potential relief of the substrate and, consequently, change of adsorption geometry and electron state of NO molecules.
Optical magnetic mirror from the point of view of molecular optics
Authors:   Pacific State University, Averbukh B.B. , Averbukh I.B. ,   Pacific State University
Published: March 2021

A condition for the realization of an optical magnetic mirror at the interface of the vacuum - medium from electric dipoles (or from electric and magnetic dipoles) is obtained. This condition in certain frequency ranges can be fulfilled not only for metamaterials, as is commonly believed, but also for ordinary media. The possibility of realizing a magnetic mirror upon reflection from a medium from linear electric quadrupoles is shown.
The influence of the dark energy model in the Roche potential for interacting galaxies
Authors:   Kazan (Volga Region) Federal University, Zakirov U.N.
Published: March 2021

For the first time, the influence of the dark energy model - a new non-vacuum field - in the generalized (with allowance for the equivalence principle) Roche potential for interacting galaxies was considered. The equation of thermodynamics of the mentioned field and its possible evolutions affecting on the accelerated expansion of the Universe is given.
The study of the dynamics of the asteroid Kamo`oalewa
Authors:   Tomsk State University (Tomsk, Russian Federation), Guryanov S.A. , Galushina T.Yu. ,   Tomsk State University (Tomsk, Russian Federation)
Published: March 2021

This work is devoted to the study of the motion of the asteroid (469219) Kamo`oalewa, which moves in the orbital resonance 1: 1 with the Earth. During the object dynamics study wedetermined the approaches to the planets of the Solar System, orbital and secular resonances, and evaluated the chaosity of its orbit. A feature of the dynamics of the asteroid under consideration is its constant transitions from the state of quasi-satellite to the state of “horseshoes”.
Electrophysical properties and transfer function of the vestibular labyrinth
Authors:   Tomsk State University (Tomsk, Russian Federation), Demkin V.P. , Melnichuk S.V. ,   Tomsk State University (Tomsk, Russian Federation), Akinina M.D. ,   Tomsk State University (Tomsk, Russian Federation), Demkin O.V. ,   Tomsk State University (Tomsk, Russian Federation)
Published: March 2021

We carried out an experimental and theoretical study of the electrical conductive properties of the tissues of the vestibular labyrinth. Using the theory of dynamic systems and experimental data on measurements of the amplitudes of the electrical signal at the end of the vestibular nerve, we calculated the transfer function of the vestibular labyrinth and investigated its frequency dependence. It is shown the transfer function tends to its asymptotic value with increasing frequency. We found that the transfer function of the vestibular labyrinth for stimulating impulses emanating from the electrode located in the posterior semicircular canal is significantly less than for stimulating impulses from the electrodes located in the superior and horizontal semicircular canals.
Aluminum nitride doped with transition metal group atoms as a material for spintronics
Authors:   Tomsk State University (Tomsk, Russian Federation), Khludkov S.S. , Prudaev I.A. ,   Tomsk State University (Tomsk, Russian Federation), Root L.O. ,   Tomsk State University (Tomsk, Russian Federation), Tolbanov O.P. ,   Tomsk State University (Tomsk, Russian Federation), Ivonin I.V. ,   Tomsk State University (Tomsk, Russian Federation)
Published: March 2021

Aluminum nitride doped with transition metal group atoms as a material for spintronics The overview of scientific literature on electric and magnetic properties of AlN doped with transition metal group atoms is presented. The review is based on literature sources published mainly in the last 10 years. The doping was carried out by different methods: during the material growth (molecular beam epitaxy, magnetron sputtering, discharge techniques) or by implantation into the material. The presented theoretical and experimental data show that AlN doped with transition metal group atoms has ferromagnetic properties at temperatures above room temperature and it is a promising material for spintronics.
The influence of utrafine-grained state on thermo-physical properties of Zr-1 wt.% Nb and Ti-45 wt.% Nb alloys and processes of dissipation and accumulation of energy during deformation
Authors:   Institute of Strength Physics and Materials Science of SB RAS, Legostaeva E.V. , Sharkeev Yu.P. ,   Institute of Strength Physics and Materials Science of SB RAS, Belyavskaya O.A. ,   Institute of Strength Physics and Materials Science of SB RAS, Vavilov V.P. ,   National Research Tomsk Polytechnic University, Skrypnyak V.A. ,   Tomsk State University (Tomsk, Russian Federation), Zhilyakov A.Yu. ,   Ural Federal University named after the first President of Russia B.N. Yeltsin, Kouznetsov V.P. ,   Ural Federal University named after the first President of Russia B.N. Yeltsin, Eroshenko A.Yu. ,   Institute of Strength Physics and Materials Science of SB RAS
Published: March 2021

The results of studying the thermal conductivity and specific heat capacity of Zr-1 wt.% Nb and Ti-45 wt.% Nb in coarse-grained and ultrafine-grained states are presented. The influence of the utrafine-grained state on the thermo physical properties and the processes of dissipation and accumulation energy during deformation of the alloys are estimated. It is shown that formation of the ultrafine-grained state in the Zr-1 wt.% Nb alloy by abc -pressing and subsequent rolling leads to a decrease in its thermal conductivity and specific heat capacity by 10 and 20%, respectively, due to substructural hardening under severe plastic deformation. It is found that thermal conductivity and specific heat capacity of the ultrafine Ti-45 wt.% Nb alloy increase by 7.5 and 5%, respectively, due to dispersion hardening of the ω phase by nanoparticles and formation of a new α phase. It is established that the ultrafine-grained structure has a significant influence on the regularities of the dissipation and accumulation energy during plastic deformation, which in turn depend on their thermo-physical characteristics and on the structural and phase state.
Relaxation model of dynamic deformation of elastic-plastic media
Authors:   Institute of Strength Physics and Materials Science of SB RAS, Makarov P.V.
Published: March 2021

A variant is considered for the relaxation model of a loaded elastic-plastic medium with dislocation kinetics of plastic shearing. The model is formulated in rates and includes two independent strain rates: total strain rate, which corresponds to the rate of external action, and local rate of plastic response of the material, which represents the ability of the medium to generate strain-induced defects. This makes it possible to describe both local relaxation processes in the elastic-plastic medium and average relaxation of stresses in a loaded specimen. The model being developed amounts to microscopic ones. All model parameters are determined from independent experiments for the evolution of the dislocation continuum during loading of macroscopic specimens. The model provides an adequate description of the dynamic effects of the macroscopic response of materials depending on the strain rate: the upper and lower yield points (yield drop, yield plateau), subsequent strain hardening as well as features of cyclic and alternating loading, ideal and nonideal Bauschinger effect.
Influence of porosity on the fracture toughness coefficient Kc of hydroxyapatite - multi-wall carbon nanotubes biocomposite materials
Authors:   Institute of Strength Physics and Materials Science of SB RAS, Ponomarev A.N. , Barabashko M.S. ,   B. Verkin Institute for Low Temperature Physics and Engineering of NAS of Ukraine, Rezvanova A.E. ,   Institute of Strength Physics and Materials Science of SB RAS, Evtushenko E.P. ,   Institute of Strength Physics and Materials Science of SB RAS
Published: March 2021

The influence of the porosity on the values of the fracture toughness coefficient Kc of hydroxyapatite - multi-walled carbon nanotube biocomposite materials (HA-MWCNTs) has been analyzed. It has been found that on the resulting values of the coefficient Kc two competing factors are affected. On the one hand, the additives of multiwalled carbon nanotubes (MWCNTs) mechanically stronger than the surrounding hydroxyapatite (HA) matrix leads to increase the Kc due to the possible change the direction of the crack propagation from planar geometry and leads to a decrease of the force of the crack propagation. On the other hand, the increase of the content of MWCNT additives leads to a decrease of the porosity of the composite. Numerical computer simulation of crack formation in HA with various porosities was performed. It was shown that a decrease of porosity, that appear due to the activation of the sintering process as a result of intercalation of MWCNT additives to the HA, leads to a decrease of the crack resistance coefficient Kc of the ceramic. It has been shown that MWCNT additives in the content of less than 0.5 mass. % do not lead to a significant increase of the fracture toughness coefficient Kc due to competition between these two mechanisms.
Operation influence on structural and phase condition of 0.12C-1Cr-1Mo-1V-Fe steel
Authors:   Tomsk State University of Architecture and Building, Popova N.A. , Nikonenko E.L. ,   Tomsk State University of Architecture and Building; National Research Tomsk Polytechnic University, Ababkov N.V. ,   Kuzbass State Technical University; LLC “Kuzbass Center of Welding and Control”, Smirnov A.N. ,   Kuzbass State Technical University; LLC “Kuzbass Center of Welding and Control”
Published: March 2021

By the method of transmission electron diffraction microscopy the study of 0.12C-1Cr-1Mo-1V-Fe steel samples subjected to various long-term operation was conducted: 1) on the unfinished sample, 2) after prolonged operation without sample destruction, and 3) after prolonged operation brought to sample destruction. For each sample the phase composition was determined and the change in morphology of the structure was studied. It is established that operation of steel leads, firstly, to the destruction of plate pearlite and intensive ferrite fragmentation, secondly, to the redistribution of carbide component and, thirdly, to elastic distortion of the crystal lattice.
Metal-polymer nanocomposites based on pyrolyzed polyacrylonitrile with metal inclusions of Fe-Ni-Co
Authors:   Institute of Priority Technologies Volgograd State University, Zaporotskova I.V. , Kakorina O.A. ,   Institute of Priority Technologies Volgograd State University, Kojitov L.V. ,   National University of Science and Technology “MISiS”, Boroznina N.P. ,   Institute of Priority Technologies Volgograd State University, Popkova A.V. ,   Research Institute NPO “LUCH”, Boroznin S.V. ,   Institute of Priority Technologies Volgograd State University, Korovin E.Y. ,   Tomsk State University (Tomsk, Russian Federation)
Published: March 2021

Results of modeling and quantum-chemical calculations of metalpolymeric composites on the basis of pirolyzed polyacrylonitrile (PPAN) with metal particles impurities of the threefold Fe-Ni-Co connection are presented in article. The model of single-layer PPAN in which eight atoms of the main substance cluster of polymer are replaced with three atoms of iron, nickel and cobalt is considered. Features of geometrical structure and the electronic and power structure of a nanocomposite are defined. It is established that introduction of a metal nanosystem leads to reduction of width of energy gap of a metalcomposite due to emergence of levels of the replacing metal atoms in a valence band (nickel, cobalt) or on border of a conduction band (iron) that leads to change of the carrying-out properties of the received nanocomposite. On the basis of the analysis of charging redistribution in a system it is established that the charge carriers appearing in a system can participate in the directed movement of free charges in a metalpolymeric composite when imposing electric field that leads to change and magnetic characteristics of a nanocomposite.
Influence on the energy of covalent link of the isotopic composition forming its nuclei
Authors:   Kuban State University, Dzhimak S.S. ,   Southern Scientific Center RAS, Kopytov G.F. ,   Kuban State University, Tumaev E.N. ,   Kuban State University, Isaev V.A. ,   Kuban State University, Moiseev A.V. ,   Kuban State Agrarian University, Malyshko V.V. ,   Southern Scientific Center RAS; Kuban State Medical University, Elkina A.A. ,   Kuban State University; Southern Scientific Center RAS, Baryshev M.G. ,   Kuban State University; Southern Scientific Center RAS
Published: March 2021

In this paper, on the basis of the classical quantum-mechanical approach, an explanation is considered of the physical mechanism of isotope fractionation associated with the predominance of a certain number of neutrons among nucleons and explaining the nonequilibrium accumulation of certain forms of stable isotopes of biogenic elements in heterogeneous systems. The reasons for the detected neutron effect can be: the interaction of the magnetic moments of atomic nuclei and valence electrons, leading to a change in the distance between them, including the effect of the changed distance between atoms on the energy of the covalent bond between the resonant pairs of atoms.
Affect of prolonged thermal exposure on microstructure and mechanical properties of ultrafine-grained bioinert Zr - 1 wt. % Nb and Ti - 45 wt. % Nb alloys
Authors:   Institute of Strength Physics and Materials Science of SB RAS, Eroshenko A.Yu. , Sharkeev Yu.P. ,   Institute of Strength Physics and Materials Science of SB RAS, Khimich M.A. ,   Institute of Strength Physics and Materials Science of SB RAS, Uvarkin P.V. ,   Institute of Strength Physics and Materials Science of SB RAS, Tolmachev A.I. ,   Institute of Strength Physics and Materials Science of SB RAS, Glukhov I.A. ,   Institute of Strength Physics and Materials Science of SB RAS, Legostaeva E.V. ,   Institute of Strength Physics and Materials Science of SB RAS
Published: March 2021

The results for thermal stability of the microstructure and mechanical properties of ultrafine-grained alloys Zr-1 wt. % Nb and Ti-45 wt. % Nb alloys after long-term thermal annealing at temperature of 400°C are presented. It is shown that in the Zr-1 wt.%Nb alloy in the ultrafine-grained state, increase in the annealing duration from 5 to 360 hours leads to growth of the structural elements (grains, sub-grains, fragments) of the matrix phase a - Zr and the particles β-Nb. This fact is due to the processes of recrystallization. It leads to softening of the alloy and decrease of microhardness and yield stress. It was also found that annealing up to 360 hours does not affect the size of the structural elements of the matrix β-phase in the Ti-45 wt. % Nb alloy, but contributes to the noticeable growth of the α-phase and ω-phase grains. According to our results, softening of the Ti-45 wt. % Nb alloy and decrease in its mechanical characteristics are associated with the processes of return at the grain boundaries, as well as with growth of the nanoscale grains of α-phase and ω-phase and decrease in their contribution to dispersion hardening.
The phosphorescence decay kinetics in the presence of a statistical distribution of molecules over the rates of radiative and non-radiative deactivation of triplet excitations
Authors:   North-Caucasus Federal University, Zhdanova N.V. , Deryabin M.I. ,   North-Caucasus Federal University, Erina M.V. ,   North-Caucasus Federal University
Published: March 2021

Approximate formulas of phosphorescence decay kinetics under the conditions of the statistical scatter of molecules over rate constants of radiative or non-radiative deactivation of triplet excitation have been obtained. It is shown that the phosphorescence decay function has different form for these two cases. The obtained difference in kinetics was used to establish the reason for the deviation from the exponential law and faster decay of the sensitized phosphorescence of naphthalene and diphenyl in n-paraffin matrices ( T = 77 K) in the presence of heavy atoms in the donor.
Ensino coletivo de violão: uma pesquisa bibliográfica nos anais dos encontros da ABEM entre os anos 2003-2017
Authors: Amat y León Correa Carlos Augusto
Published: March 2021

Esta pesquisa teve como objetivo geral mapear e analisar as publicações acerca do ensino coletivo de violão nos Anais dos Encontros s da ABEM entre os anos 2003- 2017. A partir do método de pesquisa bibliográfica, a investigação categorizou e analisou as publicações nesta fonte de divulgação cientifica específica. Através da análise e reflexões sobre os materiais coletados, foram identificadas: 51 publicações já realizadas na temática no período 2003-2017; realizou-se a quantificação de incidências das palavras chave; identificou-se 22 trabalhos de pesquisa e outros 29 de relatos de experiência, os quais foram categorizados pelos seus objetivos correspondentes; da mesma forma categorizou-se os níveis acadêmicos dos trabalhos, separados por aqueles que são de monografia, mestrado, doutorado e especialização. Finalmente, identificou-se os contextos sociais e culturais que permeiam o desenvolvimento das práticas ou investigações encontradas.
Matematik Öğretmenlerinin Okul Dışı Öğrenme Ortamlarının Kullanımına Yönelik Görüşleri
Authors: KIR Hatice , KALFAOĞLU Melikenur , AKSU Hasan Hüseyin
Published: March 2021

Okul dışı öğretim; okul bahçesinde, okul civarında veya okul dışında yapılan eğitim faaliyetleridir (Kaymakçı ve Ürey, 2020). Bu araştırmada, matematik dersinde kullanılan okul dışı öğrenme ortamlarını ve bu öğrenme ortamlarında gerçekleştirilen öğretim faaliyetlerine ilişkin matematik öğretmenlerinin görüşlerini ortaya koymak amaçlanmıştır. Amaca yönelik yapılan çalışmada ilgili konunun ayrıntılarıyla ele alınabilmesi adına nitel araştırma yöntemlerinden biri olan durum çalışması kullanılmıştır. 2020-2021 eğitim-öğretim yılı güz yarıyılında gerçekleştirilen çalışmaya MEB’e bağlı ortaokullarda görev yapan ve gönüllülük esasına dayalı olarak seçilen 12 matematik öğretmeni katılmıştır. Covid-19 pandemisi sürecinde araştırmayı uygun şartlarda devam ettirebilmek amacıyla uygun/kolay ulaşılabilir örnekleme yöntemi seçilmiştir. Araştırmada veri toplama aracı olarak matematik dersinde kullanılan okul dışı öğrenme ortamları ile ilgili verileri elde etmek amacıyla araştırmacılar tarafından geliştirilen ve açık uçlu sorulardan oluşan yarı yapılandırılmış görüşme formu kullanılmıştır. Görüşmeden elde edilen veriler içerik analizine tabi tutulmuştur. Araştırmadan elde edilen verilere göre; öğretmenlerin okul dışı öğrenme ortamlarını oldukça fazla kullandıkları, en sık kullanılan okul dışı öğrenme ortamlarının ise tarihi ve kültürel mekanlar, çevre ve arazi, alışveriş yerleri olduğu sonucuna ulaşılmıştır. Okul dışı öğrenme ortamlarını kullanma konusunda en sık karşılaştıkları problemin ise izin alma prosedürleri ve sınıf dışında öğrencileri kontrol etmenin zor olması olduğu görülmüştür. Öğretmenler, izin konusunda imkanların iyileştirilmesi ve okul dışı öğretime dair kılavuzların yayınlanması önerisinde bulunmuştur.
Investigation of the Effects of Nonverbal Proof Based Education for Preservice Mathematics Teachers
Authors: DEMİRCİOĞLU Handan
Published: March 2021

Nonverbal proofs are diagrams or illustrations that will help us see what a mathematical expression means, why it is true, and how it is proved. The aim of this study is to examine the effects of nonverbal proof-based education on preservice mathematics teachers. The study was conducted using case study research methods, one of the qualitative research designs. The participants of the study consisted of 31 preservice mathematics teachers. The data were collected in writing at the beginning and end of the process with questions directed to preservice teachers. These questions in the data collection tool were used to compare the responses of the preservice teachers who had an experience with nonverbal proof in the pre and post assesment and compare the changes. In the analysis of the data, descriptive analysis, which is a qualitative data analysis, was used. Firstly, each preservice teacher’s responses in the post assesment are classified according to their similarities and differences and then are categorized. Then, the answers in the pre assesment were examined and the responses were compared whether there was a change or not. The findings of the study showed that the preservice mathematics teachers’ experience of nonverbal proof effect on the recognition of the given image and establishing a relationship with different mathematics subjects.
Cyanobacterial Growth, Harvest, and Genomic DNA Prep v1
Authors: D Ward Ryan , Mai Truc , Pietrasiak Nicole
Published: March 2021

This protocol is a method for the growth of terrestrial and freshwater cyanobacteria in liquid medium and the subsequent harvesting and genomic DNA extraction. Life history traits of these microorganisms such as firm cell walls, exopolysaccharide secretions, and variability in growth rates present challenges to studying their genotype. Our approach establishes a generalizable protocol to grow diverse cyanobacteria under the same conditions and a robust DNA extraction technique that produces high-quality low to medium molecule size DNA for Illumina genome sequencing.
Probiotics v1
Authors: Indra Paul Sulav
Published: March 2021

Gut probiotic improves growth and health of B. gonionotus fishes
Real-Time PCR protocol to screen for SARS-COV-2 variants of concern (B.1.1.7, P.1 and B.1.1.35) v1
Authors: M Romano Camila , De Jesus Jaqueline , Clara Felix Alvina , V de Paula Anderson , S Andrade Pâmela , M de Oliveira Franciane , Cândido Darlan , Faria Nuno , M de Souza William , C Sabino Ester
Published: March 2021

The recently emerged variants of concern (VOC) B.1.1.7 in UK, B.1.1.35 in South Africa and P.1 in Brazil have increased transmissibility and are rapidly spreading worldwide. These variants have several substitutions that allow them to bypass the immune responses and are up to 10 times more contagious than the previous circulating SARS-COV-2 lineages. While in some regions P.1 predominates (as several estates in Brazil), in other countries B.1.1.7 or B.1.1.35 are most prevalent. Therefore, real-time surveillance of VOC is the key for rapid public health responses. In this matter, RT-PCR protocols that are capable of detecting VOCs easily and rapidly are needed. We developed and validated a protocol that detect simultaneously the 3 most widespread VOC. Although this protocol does not discriminate among the VOCs, it can reliably detect mixed infection. Importantly, our protocol successfully identified a co-infection by two SARS-COV-2 lineages (P.1 and B.1), confirmed through complete genome sequencing.
SİNTERLEME SICAKLIKLARI VE MAGNEZYUM OKSİT İLAVESİNİN HİDROKSİAPATİTİN ÖZELLİKLERİNE ETKİSİ
Authors: PAZARLIOĞLU Süleyman Serdar
Published: March 2021

Bu çalışmada farklı sinterleme sıcaklıkları (900-1300oC) ve farklı oranlardaki magnezyum oksit (MgO; ağırlıkça %0.5, %1 ve %2) ilavelerinin ticari saflıktaki bir hidroksiapatit (HA)’ in mikroyapısal, fiziksel ve mekanik özelliklerine etkileri incelendi. MgO ilavesiz HA’ in basma dayanımı ve kırılma tokluğu özelliklerinin üç ana nedenden dolayı (dekompoze olma, aşırı tane büyümesi ve mikro çatlak oluşumu) 1100oC' nin üzerindeki sıcaklıklarda azaldığı belirlendi. Tüm numunelerde ana faz olarak HA, eser faz olarak ise beta/alfa-trikalsiyum fosfat ve kalsiyum oksit (MgO ilavesiz HA’ te) ile whitlockite (MgO ilaveli HA’ te) tespit edildi. MgO ilavesi ile saf HA’ te meydana gelen tane büyümesinin engellendiği görüldü. Ağırlıkça %1 oranında MgO ilaveli HA’ te ait mikroyapıların, diğerlerine kıyasla daha homojen ve düzgün tanelerden oluştuğu tespit edildi. HA’ e ağırlıkça %0.5 ve %1 oranlarında MgO ilavesinin tüm sıcaklıklarda saf HA’ e ait özelliklerin artmasına katkı sağladığı belirlendi. Poroziteli yapısı nedeniyle, %2 MgO ilaveli HA tüm sinterleme sıcaklıklarında diğerlerinden daha düşük sinterlenebilirliğe ve özelliklere sahip olduğu belirlendi. %1 MgO ilaveli HA’ nin, saf HA’ e oranla %38 oranında daha fazla basma dayanımı (183.25±25.09 MPa) ve %53 oranında daha fazla kırılma tokluğuna (1.472±0.041 MPam1/2) sahip olduğu, ancak düşük kırılma tokluğu nedeniyle insan vücudunda kullanıma uygun olmadığı belirlendi.
İşyeri-Konut İç Mimarisinde Kullanılan Lif Levhaların Radyasyon ve Elektrik Yalıtımının İncelenmesi
Authors: AÇIK Cebrail , TUTUŞ Ahmet
Published: March 2021

Son yıllarda küresel çapta dijital teknolojinin artması, çevrimiçi uygulamaların yaygınlaşması, pandemi gibi birbirine bağlı sebeplerden dolayı, hayatın büyük bir bölümü iç mekânlarda geçmektedir. Bu nedenle yaşam konforu ve güvenliği açısından parke, lambri gibi iç mekân donatılarının radyasyon veya elektrik akımları karşısındaki yalıtım kabiliyetlerinin bilinmesi gerekmektedir.

Bu çalışmada, işyeri-konut iç mimarisinde en çok kullanılan farklı özeliklerdeki lif levhalara, 8.9 mCi aktiviteli (663 keV enerjili) Cs-137 gama radyoizotop kaynağından ışınlama ve 1000 Volt doğru gerilim uygulanmıştır. Lif levhaların kalınlık, malzeme yoğunluğu ve farklı yüzey kaplama değişkenlerine bağlı, radyasyon ve elektrik yalıtım kabiliyetleri incelenmiştir.

Sonuç olarak, lif levhaların kalınlığı, yoğunluğu ve yüzey kaplamasının, malzemelerin radyasyon ve elektriksel yalıtım kabiliyetlerini farklı oranlarda etkilediği belirlenmiştir.
WOOD ANATOMICAL STUDIES REVEAL TAXONOMIC RELATIONSHIPS, ENVIRONMENTAL INFLUENCE AND PULP POTENTIAL IN FOUR TAXA OF Mussaenda (RUBIACEAE) GROWN IN NIGERIA
Authors:   Department of Pharmacognosy and Environmental Medicine, University of Nigeria, Nsukka, Nwafor Felix I. ,   Department of Plant Science and Biotechnology, University of Nigeria, Nsukka, Nigeria, Igwe Ugochukwu ,   Department of Plant Science and Biotechnology, University of Nigeria, Nsukka, Nigeria, Ogbonna Chidi ,   Department of Environmental Resources Management, Abia State University, Uturu, Nigeria, Ajuziogu Godswill ,   Department of Plant Science and Biotechnology, University of Nigeria, Nsukka, Nigeria, Nwosu Maria O ,   Department of Plant Science and Biotechnology, University of Nigeria, Nsukka, Nigeria
Published: March 2021

Current study was carried out to assess the taxonomic, ecological significance, and paper making potential of four taxa of Mussaenda L. (Rubiaceae) viz., M. elegans, M. erythrophylla, M. philippica var. aurorae, and M. ‘Dona Aurora’ through wood anatomical studies. Each of the taxa was collected from its natural region of provenance in two different ecological zones (Derived Savanna and Tropical Rainforest) of Nigeria. Observations from different planes of sections were made and wood maceration was carried out for fibre morphology. Absent to scanty paratracheal axial parenchyma, septate fibres, pitted vessels, storied heterocellular rays, and simple perforation plates were common features in all taxa. However, multiseriate and wider rays distinguished the exotic species from the indigenous species, and the semi-diffuse porous wood pattern was a unique feature in M. ‘Dona Aurora’. Quantitative data showed considerable variations in case of fibre lengths among the four taxa i.e. M. elegans, M. erythrophylla, M. philippica var. aurorae, and M. ‘Dona Aurora’ and was recorded 0.80 ± 0.02 µm, 0.70 ± 0.05 µm, 0.65 ± 0.03 µm and 0.64 ± 0.04 µm respectively. These observations showed that all species belong to Wood Type II of Rubiaceae and support their inclusion in the Tribe Mussaendeae and Order Ixoroideae. The influence of environmental factors was evident in the significant elongation of wood vessels of samples collected from more humid areas, but with no significant effect on their paper-making potential. More so, M. “Doña Aurora”, had general scores, would be most suitable for pulp and paper making.
Evaluation of Impact of Success Factors of Supply Chain Strategy and Flexibility on Supply Chain Performance
Authors: Chandak Amit , Chandak Sumit , Dalpati A.
Published: March 2021

Due to rapid globalization, an introduction of Goods and Services Taxes (GST), ban on BS-III vehicles, and rapid technological advancement creates new dimensions for the automobile industry in India especially for those who come in the category of small and medium enterprise (SMEs).In the current changing scenario victorious execution of supply chain management (SCM) practices can provide competitive leverage to Automobile manufacturers over their rivals particularly those who are poorly implemented supply chain management practices. This paper takes two main SCM practices, i.e. supply chain flexibility (SCF) and supply chain strategy (SCS).Against this background, this paper acknowledged 5 success factors (SFs) for supply chain flexibility and 3 success factors (SFs) for supply chain strategy for proper implementation of SCM practices in the Automobile industry, and studied their impact on three factors of supply chain performance (SCP), and thereby on firms performance. The top management of any industry is focused on their core strength with commitment, long-term vision and provides resources for supply chain, and thereby developing effective and efficient SCS emerged as the most significant SFs. To measure the impact on supply chain performance, the author carefully measures different SFs of SCS related to customer-oriented strategy, innovation strategy and agile supply chain strategy on cost performance, logistics performance and customer satisfaction performance. Similarly to access the impact on supply chain performance, carefully measure different SFs of SCF on cost performance, logistics performance and customer satisfaction performance. Results are analyzed by testing research propositions using standard statistical tools.
Black rice cultivar from Java Island of Indonesia revealed genomic, proteomic, and anthocyanin nutritional value
Authors: Sari Dewi Ratih Tirto , Paemanee Atchara , Roytrakul Sittiruk , Cairns James Robert Ketudat , Safitri Anna , Fatchiyah Fatchiyah
Published: March 2021

Black rice is considered to be functional food containing anthocyanins as bioactive compounds. This study examined the genomic and proteomic patterns in local black rice from Java Island, Indonesia, with attention to the mechanism of anthocyanin synthesis. Three kinds of black rice from Java Island, including black rice from East Java (BREJ), black rice from Central Java (BRCJ), and black rice from West Java (BRWJ), were studied in comparison to white rice (WREJ) and red rice (RREJ). Genomic profiling was done by simple sequence repeat (SSR) analysis, and sequencing of red coleoptile (Rc) and glycosyltransferase (GT) genes, followed by in silico analysis. Total anthocyanin was investigated by ultra-high performance liquid chromatography- diode array detector (UHPLC-DAD). The proteomic profiles were determined by liquid-chromatography and mass spectrometry of tryptic peptides. The SSR profiles showed a specific band in each black rice variant. The Rc gene exon-2 sequences were similar in the three black rice cultivars. The GT gene sequence was identified as a new variant that correlates with the purple stem, leaf, bran, and whole grain morphology seen exclusively in the BRWJ cultivar. The anthocyanin composition in Java black rice is diverse. The highest cyanidin level was seen in BRWJ and the highest level of peonidin-3-O-glucoside in BREJ. Proteomic profiling of the black rice cultivars demonstrated that the expression of proteins that might be related to the levels of anthocyanin synthesis varied. These studies conclude that the genomic, proteomic and anthocyanins composition of Java black rice cultivars may be used the improvement of their functional nutrition values.
Overseas Medical Treatment of Sri Lankan Medical Travellers
Authors: Adikari Pamila S , De Silva Dileep , De Silva Sunil
Published: March 2021

More and more Sri Lankans reach for overseas medical treatment with the raising standards of living in the country. However, it is largely an unexplored area. Economic burden of overseas medical treatment is largely an out-of-the-pocket expenditure. Considering the economic burden and low health insurance penetration among Sri Lankans, healthcare decision-makers should explore the clinical dynamics of this subset of patients to improve the services within the country. The study aimed to describe the clinical characteristics and cost of medical treatment by medical travellers for treatment overseas. A descriptive study was carried out by a team of experts analyzing the data of estimated overseas medical expenditure recorded at the President Fund, a body established to assist Sri Lankans who need financial assistance for the said purpose. The team studied the deidentified databases for 2018 and 2019. Of the 60 patients studied, liver transplant, treatment for scoliosis, and bone marrow transplant topped the list by the number of cases and the estimated cost for the procedure overseas. Advance cancer treatment, cardiac surgery, and brain and spinal cord surgery also contributed significantly to the burden. Highest estimated unit cost per procedure has been recorded by the liver and bone marrow transplant surgeries. In conclusion, the healthcare decision-makers should liaise with relevant professional bodies to establish liver and bone marrow transplant services, advance brain and spinal cord surgery including treatment of scoliosis, and advance cancer treatment and cardiac surgeries. Considering the lack of data sources on the economic burden of overseas medical treatment, authorities should act promptly to capture nationwide details of this important group of patients.
Stakeholdersâ€™ Perceptions of Chinese Takeovers: The Case of Germany and Italy (Evidence from the National Press)
Authors: Vaccarini Katiuscia , Nippa Michael , Spigarelli Francesca
Published: March 2021

Objective: Italy and Germany are two large economies of the European Union. However, they differ with regard to culture, business environment structure, as well as social and political concerns. This paper focuses on how Chinese takeovers are perceived by stakeholders as reflected in the national press in Italy and Germany, and compares stakeholdersâ€™ perceptions in two major national news magazines. Method: Stakeholdersâ€™ perceptions were retrieved by adopting a qualitative approach which unfolds in a detailed and specific procedure. The textual elements referring to perceptions were categorized on the basis of specific questions. To ensure objectivity, the authors carried out independent reading and rating and the assessment of positive, neutral, and negative perceptions. Results: The German government highlights the growing awareness of a one-sided technology drain, while the Italian tends to perceive China as a negative investor. German and Italian shareholders have positive perceptions due to economic benefits. However, employees seem to have no voice. Conclusions: Factors related to national culture and business environments may be due to the fact that employees have no voice in the national press articles. Contributions: This study contributes to interpreting the phenomenon host country stakeholders, especially employees, who are under-represented.
COVID-19: Perception of the Pandemic and the Importance of Barrier Measures by the Fruit and Vegetable Sellers of Port-Au-Prince
Authors: Benjamin Francklin , Jean Katiana , Antoine Renando , Prou Marc , Millien Max , Balthazard-Accou Ketty , Emmanuel Evens
Published: March 2021

Covid-19 has triggered an unprecedented crisis that not only concerns health, it is also an economic, social, political and possibly humanitarian crisis. In March 2020, the WHO declared the disease to be pandemic and recommended the application of barrier measures. The research question here is to establish the level of social perception of fruit and vegetable sellers of the application of barrier measures in Haiti. This study was based on a mainly qualitative approach. A survey was carried out on a random sample of 50 fruit and vegetable sellers, a vulnerable social category of the metropolitan region of Port-au-Prince (RMPP). 98% of the population studied were women; 92% of them came from rural areas. Only 4% of the respondents declared that they practiced physical distancing versus 96% who declared that they were not able to practice it, or place one of their family members in quarantine. It appears pertinent to grasp, in future, the perception of COVID-19 by the Haitian population on the basis of a comparative approach that places several social classes and several economic activities in the contexts of their respective situations.
Reseaux de solidarite et developpement du secteur informel feminin en cote dâ€™ivoire : etude de cas des femmes entrepreneures a bouakÃ©
Authors: Fofana Valoua , Venance Adou Paul , Mariam Camara
Published: March 2021

Les femmes dÃ©veloppent de plus en plus de stratÃ©gies entrepreneuriales pouvant faciliter le dÃ©veloppement et la pÃ©rennitÃ© de leurs petites unitÃ©s Ã©conomiques. En dÃ©pit des niveaux trÃ¨s faibles du capital humain, matÃ©riel et financier, elles parviennent Ã  devenir d'importantes entrepreneures par des stratÃ©gies de mutualisation tout aussi innovantes quâ€™hybrides. Ces systÃ¨mes de solidaritÃ© font lâ€™objet de cet article. Il vise, notamment, Ã  comprendre et analyser le processus de transformation de ces activitÃ©s informelles en lien avec les diffÃ©rentes formes de solidaritÃ©s auxquelles participent les promotrices. Pour ce faire, une enquÃªte mixte (qualitative et quantitative) a Ã©tÃ© conduite auprÃ¨s dâ€™un Ã©chantillon alÃ©atoire simple de 96 femmes revendiquant une rÃ©ussite Ã©conomique dans leurs activitÃ©s Ã  BouakÃ©. A terme, lâ€™analyse des donnÃ©es empiriques au moyen de la dÃ©marche interactionniste suggÃ¨re : (i) les dÃ©terminants des choix des rÃ©seaux par les femmes; (ii) lâ€™accompagnement des activitÃ©s par ces rÃ©seaux; (iii) la sÃ©curisation de celles-ci par la pÃ©rennisation des activitÃ©s et ; (iv) les tensions inhÃ©rentes aux relations interpersonnelles au sein des rÃ©seaux de solidaritÃ©.
 
Women are developing more and more entrepreneurial strategies that can facilitate the development and sustainability of their small economic units. Despite the very low levels of human, material and financial capital, they manage to become important entrepreneurs through mutualization strategies that are as innovative as they are hybrids. These solidarity systems are the subject of this paper. It aims, in particular, to understand and analyze the transformation process of these informal activities in connection with the different forms of solidarity in which the promoters participate. To do this, a mixed survey (qualitative and quantitative) was conducted with a simple random sample of 96 women claiming economic success in their activities in BouakÃ©. Ultimately, the analysis of empirical data using the interactionist approach suggests: (i) the determinants of network choices by women; (ii) the support of activities by these networks; (iii) securing them through the sustainability of activities and; (iv) the tensions inherent in interpersonal relationships within solidarity networks.
The Impact of Monitoring Mechanism on Efficiency Change and Productivity Growth of Private Commercial Banks in Bangladesh
Authors: Chaity Naznin Sultana , Alam S.M. Shafiul
Published: March 2021

This paper focuses on understanding the effects of monitoring mechanism (i.e., board quality as well as ownership structure) on efficiency and productivity changes of private commercial banks in Bangladesh over the period from 2007 to 2016. Two non-parametric methods - data envelopment analysis and malmquist productivity index - were used to determine the efficiency and productivity of private commercial banks in Bangladesh. Based on constant returns to scale, five inputs and two outputs have been used to determine the efficiency scores and to identify any improvement in productivity over the period. It was found that private commercial banks of Bangladesh are at the efficiency level of 80.84%. The productivity of all private commercial banks does not follow any trend. Out of twenty two (22) PCBs, only nine (9) banks could manage to increase productivity. Hypothesis test (one sample t-test) are conducted to validate the results. The impact of stock market crisis period on the overall productivity and efficiency of the banks is also evident.
How the Pension System Responds to Pandemic Shocks: A Case Study of Georgia
Authors: Ghaniashvili Maka
Published: March 2021

The paper focuses on the impact of the pandemic crisis on pension system in Georgia and analyzes the pros and cons of the ongoing pension reforms in the country. Decreased birth rates and increased life expectancy over the next decades will significantly change the picture of the age distribution of the population in many countries. As life expectancy increases and the birth rate decreases, more people retire than are added to the workforce. A change in the demographic picture necessitates fundamental pension reform. At the same time, the world is facing a crisis caused by the COVID-19 pandemic. The future is uncertain, both medically and financially. Despite optimistic forecasts, the second wave of the COVID-19 pandemic has begun in many countries which further increases the degree of uncertainty. Funded pension schemes suffer from the crisis because lower returns diminish their asset values, while low yields on public debt instruments increase the present value of their liabilities. This can generate both explicit fiscal risksâ€” in the case of government guaranteesâ€”and implicit fiscal risks through lower private pension benefits or financial strain on the sponsoring employers. Our research is focused on the pension system and its development problems in Georgia, taking into account that since 2019, 1st January, the existing financial, demographic and economic challenges have determined the establishment of a new pension system. Main sources for the research are data gathered from the international organizations and local governmental and statistical data softwares. Our research results show that the pension reform launched in 2019 in Georgia is a significant step forward in reducing social imbalances and fiscal pressures in the medium / long term. However, for further development, it is important to systematically assess the effectiveness of pension policies, taking into account factors such as changes in demographic structure, expected fiscal spending, the inequality gap and the crisis caused by the COVID-19 pandemic.
Territorial Marketing Applied of Great Events: The Case Study of Cortina dâ€™Ampezzo
Authors: Fedrici Silvia , Rancati Elisa
Published: March 2021

Territorial marketing and great events marketing is generally considered by academics and professionals as a discipline with dynamic and not fully distinct fields. This study aims to develop research in these fields, examining the impacts of territorial marketing on a tourism destination during a great event. Data collected from tourists in Cortina dâ€™Ampezzo (Italy) demonstrates that this destination became famous following territorial marketing used for the Olympic Games in 1956 and its attractiveness is still alive, so much so that it has been chosen once again to host the 2026 Winter Olympic Games. This study underlines how territorial marketing has created a tourism destination that can attract tourists regardless of the great event.
Research Competence Training Model for First-Time Investigators (Panama, Udelas)
Authors: Analinnette Lebrija , Raul Montenegro , Harminder Kaur
Published: March 2021

Research culture is a fundamental factor in any university that promotes quality. The steppingstone in this process is the professors, who must possess the necessary knowledge, skills, and attitudes for the development of innovation and application of knowledge. This study is an action investigation, with an objective to validate a training model accompanied by the training of investigation and knowledge communities, aimed at the university professors from the Specialized University of the Americas (UDELAS). This is a descriptive field study that allows the reflection and analysis of the strengths and weaknesses of the training process of investigators in UDELAS. While conducting scientific studies, this university promotes scientific culture through the training and development of knowledge and investigation communities. These communities are formed by professors-investigators with an interest in the same line of investigation. The results indicate that professors-investigators have improved their scientific knowledge. Investigation communities have become much stronger, and participants have perceived an adequate process of accompaniment and administration. In conclusion, research culture has grown in UDELAS and it has been proved that the used model is efficient and has achieved its objectives.
Adoption of Brain-Based Instruction by Higher Education Science and Engineering Departments in Ethiopia: A Quantitative and Qualitative Survey
Authors: Abraha Ataklti , Siming Luo
Published: March 2021

Brain-Based Instruction methods have become influential at almost all educational levels. This paper examined the extent to which Natural and Computational Sciences and Engineering instructors in Ethiopian Higher Education Institutions apply Brain-Based Instruction principles (i.e., relaxed alertness, orchestrated immersion, and active processing) in their learningteaching process. This paper used a descriptive survey research design with a concurrent mixed (quantitative and qualitative) methodology. A questionnaire was used to gather quantitative data from a random sample of 512 instructors (292 from Natural and Computational Sciences and 220 from Engineering). Qualitative data were gathered from six selected instructors (three from Natural and Computational Sciences and three from Engineering) via a semistructured interview. A pilot study was used to confirm the validity and reliability of the research instruments. Quantitative data were analyzed by standard univariate methods. Qualitative data were analyzed by thematic analysis. The findings depicted that limited implementation of Brain-Based Instruction principles. Furthermore, the study showed that Higher Diploma Program training and length of teaching experience positively influenced the use of Brain-Based Instruction principles. The paper discusses implications for Brain-Based Instruction in Ethiopia and suggests areas for future research.