bluuebunny/crossref_metadata_2025 huggingface dataset:
The implementation and evaluation of a behaviour-based safety intervention at an iron ore mine
Authors: Möller GP , Rothmann Sebastiaan
Published: April 2017

It is estimated that workers worldwide suffer 250 million accidents each year, with 330 000 fatalities. This is despite the implementation of traditional safety interventions like safety engineering. Little emphasis has thus far been placed on behavioural interventions to improve safety culture and performance in the workplace. The aim of this study was to determine to what extent the safety culture and safety performance in an iron ore mine were affected by the implementation of a behaviour-based safety intervention. A longitudinal design was used. The sample consisted of 562 employees of an iron ore mine. The results showed that the implementation of the safety intervention brought about an improvement in the safety culture at the mine, and positively impacted on the number of lost-time injuries.
Redistributing environmental tax revenue to reduce poverty in South Africa: The cases of energy and water
Authors: Van Heerden JH , Blignaut JN , Mabugu M , Gerlagh R , Hess S , Tol RSJ , Horridge M , Mabugu R , De Wit M , Letsoalo T
Published: April 2017

South Africa, as an upper middle-income, resource-intensive developing country with an open economy, has to find innovative ways to combat poverty, promote economic growth and reduce the intensity of resource use, simultaneously.  One option is to explore the plausibility of achieving a double dividend by levying a tax on water and energy and recycling the revenue back to the economy by allowing for a reduction in other forms of taxation.  According to the double dividend theory it is possible, under some conditions, to achieve both environmental and economic objectives.  We investigated such a possibility in the South African economy using an integrated economy/environment CGE model and found that it is indeed possible to achieve such double dividend benefits.  Given the prevailing economic and environmental contexts, government should actively search for ways to achieve such dividends.
Rare disease heralded by pulmonary manifestations
Authors: Bajaj S , Muranjan M , Karande S , Prabhat D
Published: April 2017

Pulmonary manifestations are seldom recognized as symptoms of storage disorders. The report describes the diagnostic journey in a 30-month-old male infant, born of a third-degree consanguineous marriage referred to our institute as severe persistent asthma. History revealed that the child had progressively worsening breathlessness and persistent dry cough not associated with fever but accompanied by weight loss. On physical examination, there was growth failure, respiratory distress, clubbing, hepatosplenomegaly, and occasional rhonchi. Blood gas revealed hypoxemia which improved with oxygen administration. Plain X-rays and high-resolution computed tomography of the chest showed perihilar alveolar infiltrates and patchy consolidation. The clinicoradiological features did not support a diagnosis of asthma but favored interstitial lung disease (ILD). Bronchoalveolar lavage was performed as a first-tier investigation. It showed periodic acid–Schiff-negative foamy macrophages. The clues of consanguinity, visceromegaly, ILD, and foamy macrophages in the bronchoalveolar fluid prompted consideration of lysosomal storage disorders as the likely etiology. Gaucher disease and Niemann–Pick disease A/B were ruled out by enzyme estimation. Niemann–Pick disease type C was suspected and confirmed by detecting a homozygous mutation in the NPC2 gene. This case serves to caution physicians against labeling breathlessness in every toddler as asthma. It emphasizes the importance of searching for tell-tale signs such as clubbing and extrapulmonary clues which point to a systemic disease such as lysosomal storage disorders as a primary etiology of chronic respiratory symptoms.
Looking beyond the cosmetic tattoo lesion near the eyebrow
Authors: Naeini F Fatemi , Pourazizi M , Abtahi-Naeini B , Saffaei A , Bagheri F
Published: April 2017

Cosmetic tattooing has become a risk factor for several adverse reactions related to inks, procedures, and associated clinical conditions. Development of a sarcoid reaction to the inserted tattoo pigment in the skin is not common. We report a 45 year-old patient with history of dyspnea and mild cough since two years who had subsequently developed reddish, scaly lesions in her 15-year old tattoo done near her right eyebrow. Skin biopsy of the tattoo lesion revealed cutaneous sarcoidosis which led to further investigations and a diagnosis of pulmonary sarcoidosis. The present case highlights the fact that cutaneous sarcoidosis can develop in a long-standing tattoo. Also such a patient should be screened for systemic sarcoidosis disease.
On completeness of groups of diffeomorphisms
Authors: Bruveris Martins , Vialard François-Xavier
Published: April 2017

We study completeness properties of the Sobolev diffeomorphism groups

\mathcal D^s(M)

endowed with strong right-invariant Riemannian metrics when

M

is

\mathbb R^d

or a compact manifold without boundary. We prove that for

s >

dim

(M)/2+1

, the group

\mathcal D^s(M)

is geodesically and metrically complete and any two diffeomorphisms in the same component can be joined by a minimal geodesic. We then present the connection between the Sobolev diffeomorphism group and the
large deformation matching
framework in order to apply our results to diffeomorphic image matching.
Automorphisms of the Lie algebra of vector fields on affine $n$-space
Authors: Kraft Hanspeter , Regeta Andriy
Published: April 2017

We study the vector fields Vec

(\mathbb A^n)

on affine

n

-space

\mathbb A^n

, the subspace Vec

^c(\mathbb A^n)

of vector fields with constant divergence, and the subspace Vec

^0(\mathbb A^n)

of vector fields with divergence zero, and we show that their automorphisms, as Lie algebras, are induced by the automorphisms of

\mathbb A^n

:

\mathrm {Aut}(\mathbb A^n) \xrightarrow{\sim} \mathrm {Aut_{Lie}}(\mathrm {Vec}(\mathbb A^n)) \xrightarrow{\sim} \mathrm {Aut_{Lie}}(\mathrm {Vec}^0(\mathbb A^n)) \xrightarrow{\sim} \mathrm {Aut_{Lie}}(\mathrm {Vec}^0(\mathbb A^n)).

This generalizes results of the second author obtained in dimension 2, see [Reg13]. The case of Vec

(\mathbb A^n)

goes back to Kulikov [Kul92]. This generalization is crucial in the context of infinite-dimensional algebraic groups, because Vec

^c(\mathbb A^n)

is canonically isomorphic to the Lie algebra of Aut

(\mathbb A^n)

, and Vec

^0(\mathbb A^n)

is isomorphic to the Lie algebra of the closed subgroup SAut

(\mathbb A^n) \subset

Aut

(\mathbb A^n)

of automorphisms with Jacobian determinant equal to 1.
Atributos físicos e estoques de carbono do solo sob diferentes usos da terra em Rondônia, Amazônia Sul-Ocidental
Authors: Mascarenhas Adriano Reis Prazeres , Volpato Sccoti Marta Silvana , Melo Rafael Rodolfo , Corrêa Fernando Luíz De Oliveira , De Souza Emanuel Fernando Maia , Andrade Reginaldo Almeida , Bergamin Anderson Cristian , Müller Manfred Willy
Published: April 2017

Objetivou-se estudar o comportamento dos atributos físicos e dos teores e estoques de carbono do solo em sistema agroflorestal multiestratificado (SAF), comparativamente a diferentes modalidades de uso solo, sendo elas o cultivo de cacaueiro sob manejo agroecológico (CAC), pastagem cultivada (PAS) e floresta nativa (FLN). A área de estudo localiza-se na estação experimental da CEPLAC em Ouro do Preto do Oeste, RO. Nos quatro tratamentos foram instaladas, ao acaso, cinco parcelas de 20 m x 30 m. Nessas parcelas, foram coletadas amostras de solo indeformadas e deformadas nas profundidades de 0 a 20 cm e 20 a 40 cm, para determinação dos atributos fiscos e estoque de carbono no solo. Os valores de densidade do solo no SAF, CAC e PAS apresentaram-se elevados e influenciaram negativamente o espaço poroso do solo. Os estoques de C foram influenciados pelos diferentes agroecossistemas, sendo que na camada de 0 a 20 cm foram de (Mg m-3): 24,79 (SAF); 42,71 (CAC); 41,30 (PAS); 36,07 (FLN), e na camada de 20 a 40 cm foram (Mg m-3): 17,26 (SAF); 31,06 (CAC); 22,31 (PAS); 25,49 (FLN). Todos os sistemas avaliados apresentaram resultados esperados para estoque de C no solo, no entanto, arranjos espaciais que favoreçam o aporte de matéria orgânica poderiam contribuir para a elevação dos estoques de carbono do solo em sistemas agroflorestais.
Social Live Streaming tools for the development of Virtual Workshops
Authors: García-García C. , Galán J. , Izquierdo R.
Published: April 2017

The increase of Social Media on the Internet has brought an unprecedented revolution which has changed the existing social communication systems to date. Currently, a high percentage of population in the developed world has a smartphone with Internet connection that allows being permanently connected. This enables new ways of approaching some types of tasks that have traditionally required of simultaneity in space and time, such as the development of creative proposals by a large number of people.

Technological advances have allowed, in a few years, the size reduction of a computer to today's mobile devices. Among the multitude of specifications offered by next-generation devices, the continuous evolution of the imaging capture systems is a highlight. The existence of both front-facing and rear cameras, both capable for taking pictures or record video has become widespread in the majority of mobile devices.
This paper proposes the use of Social Live Streaming Tools in mobile devices in order to facilitate the development of creative workshops, using the virtual territory as co-creation area with the aim of promoting one-to-many communications, so that a lecturer can perform a mass communication, in real time and delocalized, without losing the possibility of interact with the audience. These tools also allow the possibility for each member of a creative team to swap between different roles (viewer at some times or lecturer at others), thus stimulating the creative process through social participation.
Do continuous assessment results affect final exam outcomes? Evidence from a microeconomics course
Authors: Reboredo Juan Carlos
Published: April 2017

Continuous assessment aims to enhance student learning and understanding of a subject and so achieve better educational outcomes. We investigated how continuous assessment grades affected final exam grades. Using a dataset for six academic post-Bologna Process years (2009-2015) for a first-year undergraduate microeconomics course offered at a Spanish public university, we examined conditional dependence between continuous assessment and final exam grades. Our results would indicate a limited contribution of continuous assessment results to final exam results: the probability of the final exam performance improving on the continuous assessment grade was lower than the probability of the opposite occurring. A consistent exception, however, was students who obtained an A grade for continuous assessment. Our results would cast some doubt on the beneficial effects of continuous assessment advocated by the Bologna Process.
Applications of ordered weighted averaging (OWA) operators in environmental problems
Authors: Llopis-Albert Carlos , Palacios-Marques Daniel
Published: April 2017

This paper presents an application of a prioritized weighted aggregation operator based on ordered weighted averaging (OWA) to deal with stakeholders' constructive participation in water resources projects. They have different degree of acceptance or preference regarding the measures and policies to be carried out, which lead to different environmental and socio-economic outcomes, and hence, to different levels of stakeholders’ satisfaction. The methodology establishes a prioritization relationship upon the stakeholders, which preferences are aggregated by means of weights depending on the satisfaction of the higher priority policy maker. The methodology establishes a prioritization relationship upon the stakeholders, which preferences are aggregated by means of weights depending on the satisfaction of the higher priority policy maker. The methodology has been successfully applied to a Public Participation Project (PPP) in watershed management, thus obtaining efficient environmental measures in conflict resolution problems under actors’ preference uncertainties.
Three-Dimensional Structure of Wind Turbine Wakes as Measured by Scanning Lidar
Authors: Bodini Nicola , Zardi Dino , Lundquist Julie K.
Published: April 2017

Abstract. The slower wind speeds and increased turbulence that are characteristic of turbine wakes have considerable consequences on large wind farms: turbines located downwind generate less power and experience increased turbulent loads. The structures of wakes and their downwind impacts are sensitive to wind speed and atmospheric variability. Wake characterization can provide important insights for turbine layout optimization in view of decreasing the cost of wind energy. The CWEX-13 field campaign, which took place between June and September 2013 in a wind farm in Iowa, was designed to explore the interaction of multiple wakes in a range of atmospheric stability conditions. Based on lidar wind measurements, we extend, present, and apply a quantitative algorithm to assess wake parameters such as the velocity deficits, the size of the wake boundaries, and the location of the wake centerlines. We focus on wakes from a row of four turbines at the leading edge of the wind farm to explore variations between wakes from the edge of the row (outer wakes) and those from turbines in the center of the row (inner wakes). Using multiple horizontal scans at different elevations, a three-dimensional structure of wakes from the row of turbines can be created. Wakes erode very quickly during unstable conditions, and can in fact be detected primarily in stable conditions in the conditions measured here. During stable conditions, important differences emerge between the wakes of inner turbines and the wakes of outer turbines. Further, the strong wind veer associated with stable conditions results in a stretching of the wake structures, and this stretching manifests differently for inner and outer wakes. These insights can be incorporated into low-order wake models for wind farm layout optimization or for wind power forecasting.
Carbon geochemistry of plankton-dominated supra-micron samples in the Laptev and East Siberian shelves: contrasts in suspended particle composition
Authors: Tesi Tommaso , Geibel Marc C. , Pearce Christoph , Panova Elena , Vonk Jorien E. , Karlsson Emma , Salvado Joan A. , Kruså Martin , Bröder Lisa , Humborg Christophe , Semiletov Igor , Gustafsson Örjan
Published: April 2017

Abstract. Recent Arctic studies suggest that sea-ice decline and permafrost thawing will affect phytoplankton dynamics and stimulate marine heterotrophic communities. However, in what way the plankton composition will change as the warming proceeds remains elusive. Here we investigate the chemical signature and plankton speciation of the supra-micron (> 10 μm) particulate organic matter (supra-POM) fraction collected along the Siberian shelf. Supra-POM samples were analysed at bulk (δ13C and Δ14C) and molecular level (CuO oxidation and IP25) while plankton identification established the dominant taxa. In addition, surface water chemical properties were integrated with the plankton dataset to understand the link between plankton composition and environmental conditions. The dual-carbon isotope fingerprint indicates a large variability in the supra-POM distribution while terrestrial biomarkers suggest negligible land-derived input. In the open-waters of the outer Laptev Sea (LS), heterotrophic plankton dominated the assemblages. δ13C and Δ14C suggest that modern terrestrial dissolved organic carbon (DOC) from the Lena river is the primary source of metabolizable carbon which is transferred to the heterotrophic communities via microbial loops. Moving eastwards toward the sea-ice dominated East Siberian Sea (ESS), the system became progressively more autotrophic and dominated by sea-ice and pelagic diatoms which is confirmed. Comparison between δ13C of supra-POM samples and CO2aq concentrations suggests that the carbon isotope fractionation follows the general growth vs CO2aq supply model with the highest δ13C values found in the easternmost, most productive stations. In a warming scenario characterized by enhanced terrestrial release and further sea-ice decline, heterotrophic conditions fuelled by terrestrial DOC will likely persist in the LS while ESS might experience enhanced primary productivity. This will result in a sharp compositional gradient similar to what documented in our semi-synoptic study.
Toward a Comparative Narratology: A Chinese Perspective
Authors: Shang Biwu
Published: April 2017

As a rejoinder to Susan Stanford Friedman's call for a transnational turn in narrative theory, this article attempts to draw attention to a comparativist turn in current narrative studies, addressing three broad questions: why compare, what to compare, and how to compare. A comparative narratology is expected to decolonize and to subvert the hegemony of European and Anglo-American narrative theory, and thus both paves the way for the rise of those marginalized narrative theories and draws attention to those neglected and peripheral narratives. Apart from presenting a Chinese counterpart of Western narrative theory, it tries to specifically engage with newly developed unnatural narrative theory by analyzing Chinese ghost stories, a particular type of unnatural narrative in Chinese literature, so as to display its unnatural features as well as its challenges to existing Western unnatural approaches.
Hiding in Plain Sight: Identifying Computational Thinking in the Ontario Elementary School Curriculum
Authors: Hennessey Eden J.V. , Mueller Julie , Beckett Danielle , Fisher Peter A.
Published: April 2017

Given a growing digital economy with complex problems, demands are being made for education to addresscomputational thinking (CT) – an approach to problem solving that draws on the tenets of computer science. Weconducted a comprehensive content analysis of the Ontario elementary school curriculum documents for 44 CT-relatedterms to examine the extent to which CT may already be considered within the curriculum. The quantitative analysisstrategy provided frequencies of terms, and a qualitative analysis provided information about how and where termswere being used. As predicted, results showed that while CT terms appeared mostly in Mathematics, and concepts andperspectives were more frequently cited than practices, related terms appeared across almost all disciplines and grades.Findings suggest that CT is already a relevant consideration for educators in terms of concepts and perspectives;however, CT practices should be more widely incorporated to promote 21st century skills across disciplines. Futureresearch would benefit from continued examination of the implementation and assessment of CT and its relatedconcepts, practices, and perspectives.
Relationship between Service Quality on Public Health Center and Patient Satisfaction
Authors: Husain Akbar Fuad , Tegar Jaya Muhammad
Published: April 2017

INTRODUCTION: The aim of this study was to examine the relationship between services quality on public health center and patient satisfaction in Kutai Kartanegara Regency, Indonesia.METHOD: This research used pilot pathfinder survey, which was done on February 23rd-25th 2017 in Kutai Kartanegara Regency, Indonesia. Two questionnaires were used in the study. During the data collection, there were 192 patients from the health service center, it was consisted two locations representing the urban and rural area in order to describe the quality of health service towards the patients’ satisfaction. In order to investigate the correlation between the quality of health service and patient satisfaction, Pearson correlation test was conducted.RESULT: The highest score regarding of the service quality was on the dimension of the doctors and pharmacy were 99.5%. The lowest level of patients’ satisfaction on assurance and empathy dimension were 10.4%. There was a significance between the service quality of the doctors, nurses, pharmacy, and the administrators towards the patients’ satisfaction. The highest score of the coefficient correlation on the nurse dimension was 0.273, which means that the nurses were giving good services quality and it affects the people’s satisfaction.CONCLUSION: A good service quality believes would affect the people’s satisfaction which generally affects people’s decision to choose health service provider. Health service center is expected to increase their environmental condition, and the professionalism of the nurses and registration officers in terms of their awareness and performance in order to create better services.
De onherroepelijke volmacht en de ontbinding van de huwelijksgemeenschap waarin de volmachtgever is gehuwd
Authors: Perrick S.
Published: April 2017

De onherroepelijke volmacht en de ontbinding van de huwelijksgemeenschap waarin de volmachtgever is gehuwd

De onherroepelijke volmacht eindigt niet door de ontbinding van de wettelijke gemeenschap waarin de volmachtgever is gehuwd. Ook niet indien de grond van de ontbinding de dood van de volmachtgever of de dood van zijn echtgenoot is. Wel zal de gevolmachtigde aan de volmacht in beginsel niet de bevoegdheid ontlenen om te beschikken over een gemeenschapsgoed.
THE CALOUSTE GULBENKIAN MUSEUM
IN LISBON
Authors: Jasińska Anna , Jasiński Artur
Published: April 2017

The Calouste Gulbenkian Museum is located off
the tourist paths, on the outskirts of Europe, and far away from
the centre of Lisbon, in the serenity of the Santa Gertrudes
Park. Its austere concrete buildings hide treasures from the
collection of an extraordinary man, a millionaire of Armenian
origin, an oil magnate, and an art and garden lover. The article
presents the collector, the history of his collection and the
museum buildings which now form an original park and museum
complex run by the Calouste Gulbenkian Foundation. In
2010, the complex was entered into the register of national
monuments of Portugal, thus being the first masterpiece of the
20th-century architecture to feature in this register.
Featuring High Impact Polystyrene Composites Strengthened with Green Coconut Fiber Developed for Automotive Industry Application
Authors: Pereira Gilmara Brandão , Pereira Glayce Cassaro , Lima Márcio , De  Jesus Brunno José Silva , De Andrade Silva Ezequiel , Carvalho Benini Kelly Cristina , Bandeira Cirlene Fourquet , Montoro Sérgio Roberto
Published: April 2017

Studies focused on generating products able to reduce environmental impact have been put in place, and those aiming at finding polymeric composites strengthened with natural fibers stand out among them. A composite was strengthened with coconut fibers in the present study, since the generation of coconut residues has increased in Brazil due to coconut water industrialization.
The aim of the present study is to process a high impact polystyrene (HIPS) composite strengthened with coconut fiber and to verify its possible application in the automotive industry. Strengthened samples were prepared using coconut fibers in the proportions 10, 20 and 30% fiber to develop such HIPS composite. Analyses were performed in order to set the density, Shore A hardness and impact resistance of the processed composites.
It was found that the density and Shore A hardness results in the HIPS did not change due to the addition of coconut fibers. However, it was observed that the impact resistance was reduced because of it. It was noteworthy that the decreased impact resistance did not preclude the use of the HIPS/coconut fiber composite, since it showed that such material can be used in parts free from strong mechanical stress such as those inside the automobiles. The use of coir HIPS also aimed at reducing costs related to the polymer’s consumption and at reusing the waste (coconut husk) from coconut water industries.
Analysis of Stress Concentration Factor for Tensile Characteristics of Syntactic Foam Using Finite Element Method
Authors: Salleh Zulzamri , Islam Md Mainul , Epaarachchi Jayantha Ananda
Published: April 2017

This paper presented the stress concentration factor (SCF) around the half circular edge of tensile specimens made of syntactic foam using finite element software Strand7 software. The study is a preliminary effort, which investigates the effect of variations of crack geometry on the stress concentration factor on a tensile specimen subjected to a constant, uniform, uniaxial tensile load. The material property is graded for varying Young’s Modulus and Poisson’s Ratio with different composition of glass microballoons. Finally, a uniform pressure is applied at the top and the model is constrained with symmetric boundary conditions at the left and bottom. As the result, these numerical results for both SCF experimental and simulation model are compared to those obtained from analytic fracture mechanics procedures and are found to be varied. In addition, the SCF is sensitive to the modulus of elasticity, particularly for lower composition weight percentage (wt.%), while it is also varied with the different weight percentage (wt.%) of glass microballoons, which is led by 2 wt.% specimen.
SYNTHESIS AND STUDY OF ANTIBACTERIAL ACTIVITY OF BROMINE DERIVATIVES OF PORHYRIN POLYMERS AND THEIR ZINC COMPLEXES
Authors: Pechnikova Nadezhda L. , Ageeva Tatiana A. , Koifman Oskar I. , Alopina Elena V. , Кuznetsov Oleg Yu.
Published: April 2017

A creation of new water-soluble porphyrin-polymers having antibacterial properties is actual today because these substances can be used in a medicine and pharmacology. Therefore, the aim of this work is to obtain a water-soluble polyvinyl alcohol-based immobilizates containing dibromo-derivatives of meso-aryl porphyrins in a side chain of the polymer and the study of their bacterial activity towards Escherichia coli ATCC 25922, Candida albicans ATCC 885-653, Staphylococcus aureus ATCC 653. The bromination of 2-formyl-5,10,15,20-tetraphenylporphyrin and its zinc (II) complexes in the phenyl rings and in the β-positions of macroheterocycle was performed. 2-Formyl-10,15-(4',4'-dibromophenyl)-5,20-diphenylporphyrin and 2-formyl-dibromo-12,13-tetraphenylporphyrin were obtained. Porphyrin metalocomplexes were prepared by the complexation reaction of porphyrin dibromo-derivatives with zinc acetate. The purification of the porphyrin metalocomplexes was carried out by the column chromatography on silica gel, using chloroform as eluent. The structure of the compounds obtained was confirmed by electronic, IR and 1H NMR spectroscopy. Water-soluble porphyrin-polymers were prepared by covalent immobilization of polyvinyl alcohol based on the synthesized porphyrins and their metalocomplexes. The immobilization was carried out by acetalization reaction in an organic medium using 20% sulfuric acid as a catalyst. The immobilizates obtained are intensely colored solid polymer products which are soluble in water and dimethylformamide. Porphyrin weight content in a series of synthesized immobilizates and their immobilization molar degree were determined by electronic absorption spectra. The highest molar degree of porphyrin immobilization on polyvinyl alcohol is achieved at a fixation of 2-formyl-dibromo-12,13-tetraphenylporphyrin and zinc-2-formyl-10,15-(4',4'-dibromo-phenyl)-5,20-diphenylporphyrine on polyvinyl alcohol. It was 0.90 and 0.86, respectively. The influence of the synthesized porphyrin-polymers on Escherichia coli АТСС 25922, Candida albicans АТСС 885-653, Staphylococcus aureus АТСС 653 was investigated by diffusional method of antibacterial activity determining. An investigation of the biological activity of water-soluble immobilizates showed that the polymers and their prepared porphyrin zinc (II) complexes have antibacterial activity against the studied cultures. Significant effect on the inhibition of given cultures have immobilizate containing zinc-2-formyl-10,15-(4',4'-dibromophenyl)-5,20-diphenylporphyrine. For citation:Pechnikova N.L., Alopina E.V., Кuznetsov O.Yu., Ageeva T.A., Koifman O.I. Synthesis and study of antibacterial activity of bromine derivatives of porhyrin polymers and their zinc complexes. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 2. P. 52-59.
KINETIC OF ESTERIFICATION OF CITRIC ACID IN PRODUCTION OF TRIALKYL CITRATES
Authors: Sushkova Svetlana V. , Levanova Svetlana V. , Glazko Iliya L. , Pavlova Kristina V.
Published: April 2017

Polyvinyl chloride (PVC) is a body of a great many of composite materials and takes one of the leading places in thermoplastic polymers production capacity. Annual intake of PVC in the world (data of 2014 years) achieves to 35 mtpa. and has a consistent trend to further increase. PVC recycling is impossible without using of plasticizers. Nowdays scopes of use and plasticizers market used in the polymer materials production intended for contact with alimentary products, for medical equipment and children's toys production, are upon essential impact of policy statements of health, safety, security, environment. Plasticizers with citric acid – trialkyl citrates have needed properties: hazard class 4, high plasticize ability, full miscibility with polymer, high boiling and flash points, low volatility. The citric acid is available renewable raw produced from saccharified residues; world production volume is 1.6 mtpa. There are no local plasticizers production technologies with citric acid. Development of plasticizers production technologies with renewable raw material is relevant objective. Purpose of research is to create method of producing of trialkyl citrate, study of esterification regularities of citric acid with low molecular alcohol over different catalysts. In this research, the kinetic of performances of citric acid esterification by pentanol was estimated over different catalysts. Reaction orders were defined using three catalysts: sulphuric acid, orthophosphoric acid and p-toluene sulphonic acid. The rate constants and activation energies of esterification were found. Kinetic formulas were obtained. The time of esterification was defined to achieve 95 % conversion of citric acid. The time varies from 1.5 to 5 h depending on used catalyst. For citation:Sushkova S.V., Levanova S.V., Glazko I.L., Pavlova K.V. Kinetic of esterification of citric acid in production of trialkyl citrates. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N2. P. 74-78.
ELECTROCHEMICAL PROPERTIES OF VARIOUS CARBON MATERIALS. CALCULATION OF OXYGEN ADSORPTION
Authors: Filimonov Dmitry A. , Bazanov Mikhail I. , Yudina Tatiana F. , Bratkov Ilya V. , Leontiev Nikolai A.
Published: April 2017

New carbon materials such as oxidized (OG) and thermally expanded (TEG) graphite modified with salts of transition metals have been applied in chemical power sources (CPS) as a catalyst. An optimal combination of properties of the porous structure and chemical composition of the surface allows creating high power adsorption system. Particular attention is paid to the system of oxygen storage, widely used in various fields of human activity. The electrocatalytic activity and electrochemical properties of various carbon materials modified with salts of cobalt and iron were studied by cyclic voltammetry in alkaline solution. Working electrode polarization modes are set using the potentiostat and the PC with the interface unit. The current-voltage graphs were obtained on a personal computer with advanced signal processing on the interface device. The relative error does not exceed 3% at the determination of the redox potential values. The potentials were recorded for the observed processes with an accuracy of ± 0.01. The Randles – Shevchik equation was used to calculate the number of electrons in order to clarify the mechanism of electroreduction process in a flow of molecular oxygen (2 or 4). To assess the effect of electrocatalisis not only high current density can be used, but also the half-wave potential of the reduction of molecular oxygen. On the cathode side of the graph with the introduction of oxygen into the electrolyte there is a significant increase in current at the potential range from -0.2 to -0.6 V and from -0.7 to -0.9 V the increase in current occurs due to a process of electroreduction of molecular oxygen. Quantified characteristics of adsorption of molecular oxygen, such as the maximum amount of adsorption and Langmuir adsorption coefficient were determined based on the electrochemical properties. Langmuir adsorption coefficient characterizes the interaction energy of the adsorbate with the adsorbent. The data obtained can be used for further research cathodes with air (oxygen) depolarization.For citation:Filimonov D.A., Yudina T.F., Bazanov M.I., Bratkov I.V., Leontiev N.A. Electrochemical properties of various carbon materials. Calculation of oxygen adsorption. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 2. P. 20-25.
COMPARATIVE ANALYSIS OF IMMUNOLOGICAL COMPATIBILITY OF BIOACTIVE CALCIUM PHOSPHATE COATINGS ON TITANIUM AND MAGNESIUM ALLOYS
Authors: Zaporozhets Tatiana S. , Smolina Tatiana P. , Gazha Anna K. , Puz Artyom V. , Sinebryukhov Sergeiy. L. , Gnedenkov Sergeiy V.
Published: April 2017

Current strategies for developing the biomaterials suggest passive modulation of osteoinductive and osteoconductive properties of the implant surface through a change in their physical and chemical parameters. Also, the osseointegration of implant depends on the reaction of the immune system, the severity of which is determined by physical and chemical properties of the material and the morphological features of the coating. In this paper, the plasma electrolytic oxidation (PEO) method for the formation of biologically active compositional corrosion resistant calcium phosphate coatings on titanium BT1-0 and magnesium alloy MA8, designed for bone bioengineering was used. Bioactive PEO coatings were additionally treated with superdispersed polytetrafluoroethylene (SPTFE) in order to improve anti-corrosion properties. The cellular and molecular aspects of immunological compatibility of bioactive calcium phosphate coatings formed on titanium and magnesium alloys by promising technology of plasma electrolytic oxidation and intended for bone tissue bioengineering were studied. It is shown that PEO coatings formed on titanium and magnesium induce an activation of human peripheral blood leukocytes in vitro, associated with increased expression of activation of molecules of CD69, CD38, CD11b on the cell membranes while shedding L-selectin (CD62L). Influence of coating process technologies on the intensity of the activation processes was established. Contact cells with calcium-phosphate PEO coatings formed on titanium and magnesium alloys induced a less pronounced activation in comparison with the untreated implants. The minimal reaction of the cells of the innate immunity was observed at using a composite of PEO coatings with SPTFE, obtained by electrophoretic deposition. The composite coating on magnesium alloys induces response of the cells of the innate immunity, comparable with the response to the coatings on titanium alloys. On the whole, immunological characteristics of the PEO coatings on titanium BT1-0 and magnesium alloy of MA8 demonstrate possibility of development of materials and wares for implant surgery, including bioresorbable alloys on magnesium base. For citation:Zaporozhets T.S., Puz A.V., Sinebryukhov S.L., Gnedenkov S.V., Smolina T.P., Gazha A.K. Comparative analysis of immunological compatibility of bioactive calcium phosphate coatings on titanium and magnesium alloys. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 2. P. 45-51.
La métropole contestée : le sort incertain de Montréal et l’intégrité du territoire québécois, 1828-1860
Authors: Harvey Louis-Georges
Published: April 2017

Les mouvements partitionnistes qui émergent au moment du référendum de 1995, et au cours des années suivantes provoquent de nombreux débats politiques et intellectuels qui touchent à la question de la négociation des frontières entre le Québec et le Canada en cas de sécession. Le sort de Montréal dans le cas d’un vote favorable à la souveraineté du Québec devient alors un enjeu majeur. Or, les antécédents du partitionnisme remontent à l’époque des Patriotes, alors que dans la province du Haut-Canada des ministres torys manifestent leur intérêt pour une modification des frontières qui transfèrerait sous leur contrôle l’ile de Montréal. Dans cette entreprise qui mène à une série de rapports et de résolutions adoptées par l’Assemblée, les officiers du gouvernement haut-canadien trouveront un appui de taille dans la mouvance tory de Montréal et surtout parmi les marchands et financiers anglophones de la ville. Le mouvement s’intensifie au milieu des années 1830, et la Montreal Constitutional Association, fondée dans le sillage de l’adoption des 92 Résolutions, revendique simultanément l’annexion de Montréal au Haut-Canada ou une union législative des deux provinces canadiennes. Enfin, le gouvernement impérial entame sa propre réflexion sur la question par l’entremise de la Commission Gosford qui séjournera dans la colonie en 1835-1836. Après le soulèvement armé de 1837, le sort de Montréal se joue dans les coulisses du parlement britannique et parmi les diverses figures politiques qui cherchent d’abord à influer sur le rapport de Durham et ensuite d’infléchir la politique qui sera élaborée par Lord John Russell afin de régler définitivement la question canadienne.
Histoires de paroisses en 1900 et histoire de l’histoire
Authors: Fortin Andrée
Published: April 2017

Comment écrivait-on l’histoire en 1900, dans le mouvement de bascule entre l’histoire comme une des belles-lettres et l’histoire scientifique ? Deux sources de cette époque publient en tout plus de 200 portraits de paroisses : le Bulletin des recherches historiques et Le diocèse de Montréal à la fin du dixneuvième siècle, et la mosaïque qu’ensemble ils composent est très cohérente. Ils permettent de cerner comment en 1900 on conçoit la dynamique du peuplement et l’occupation du territoire, la place relative de l’histoire politique, sociale et économique, de voir quels sont les groupes en présence, quels sont les héros et les visionnaires dans cette histoire. Se dégage de cela un imaginaire de l’espace, du progrès et des utopies territoriales. Bref, cela permet de réfléchir à l’histoire de l’histoire du Québec.
A Identidade Docente e o uso das Tecnologias e Mídias Digitais na Escola à luz do pensar complexo
Authors: Marqueti Marilete Terezinha , Antunes de Sá Ricardo
Published: April 2017

O artigo é um ensaio crítico-reflexivo sobre as contribuições que o pensamento complexo (MORIN, 2011) pode trazer para compreender a relação entre a construção da identidade docente e o uso das tecnologias e mídias digitais na escola. Primeiramente são apresentados os elementos que caracterizam e influenciam a identidade humana (MORIN, 2011) e a identidade docente (PIMENTA, 2012) que é um processo contínuo de construção, desconstrução e reconstrução da identidade profissional e está diretamente relacionado aos saberes docentes (TARDIFF, 2002; PIMENTA, 2012; AZZI, 2012). Os professores constroem seus saberes, reelaboram e os ressignificam ao longo da sua prática profissional. Busca-se discutir sobre o uso das tecnologias e mídias digitais na escola e suas implicações para a construção da identidade docente, diante de todo o desenvolvimento científico e tecnológico que vem influenciando as mudanças na cultura e na sociedade contemporânea (LEMOS, 2013). O papel do professor (MARCELO, 2009; MEIRIEU, 2006) frente às tecnologias e mídias digitais e suas linguagens específicas provenientes do mundo contemporâneo. Essas reflexões permitem compreender que a identidade docente se modifica de acordo com a dinâmica da sociedade, da escola e das relações e inter-relações estabelecidas entre os professores, no cotidiano e nas práticas pedagógicas. Ao interagir e dialogar com o mundo e com a cultura digital, o professor reconstrói sua identidade profissional e elabora um saber tecnológico pertinente ao uso das tecnologias e mídias digitais na escola.
Matrizes teóricas dos saberes elementares matemáticos da escola primária em tempos de primeira república
Authors: Bertoni Pinto Neuza
Published: April 2017

Na história da educação matemática são recentes os estudos que investigam filiações teóricas dos saberes elementares ofertados nos primeiros anos escolares. Este artigo, centrado nos saberes elementares matemáticos da escola primária das primeiras décadas do século XX, dialoga com estudos já realizados no Grupo de Pesquisa de História da Educação Matemática – GHEMAT, acerca dos sentidos conferidos ao elementar no âmbito dos saberes elementares, dentre outros o que trata do simples e complexo no ensino da Aritmética (VALENTE, 2015). Centrando a discussão em torno do termo elementar, o presente estudo busca compreender repercussão de matrizes teóricas na organização dos saberes elementares matemáticos prescritos para o ensino primário do Paraná. Analisa o conceito do ponto de vista filosófico e pedagógico a partir de Descartes, Condorcet e Pestalozzi e busca relações dessas matrizes teóricas com a organização dos saberes elementares matemáticos programados para a escola primária em tempos de Primeira República. Para as análises são consultados programas oficiais e livros didáticos de Aritmética prescritos oficialmente para a escola primária do Paraná, entre 1903 e 1932. O estudo mostra que o método utilizado na organização dos saberes elementares matemáticos expressa a matriz teórica que fundamenta o ensino ofertado.
Treatment Algorithm for Chronic Achilles Tendon Lesions
Authors: Buda Roberto , Castagnini Francesco , Pagliazzi Gherardo , Giannini Sandro
Published: April 2017

Chronic Achilles tendon lesions (CATLs) ensue from a neglected acute rupture or a degenerated tendon. Surgical treatment is usually required. The current English literature (PubMed) about CATLs was revised, and particular emphasis was given to articles depicting CATL classification. The available treatment algorithms are based on defect size. We propose the inclusion of other parameters, such as tendon degeneration, etiology, and time from injury to surgery. Partial lesions affecting less than (I stage) or more than (II stage) half of the tendon should be treated conservatively for healthy tendons, within 12 weeks of injury. In II stage complex cases, an end-to-end anastomosis is required. Complete lesions inferior to 2 cm should be addressed by an end-to-end anastomosis, with a tendon transfer in the case of tendon degeneration. Lesions measuring 2 to 5 cm require a turndown flap and a V-Y tendinous flap in the case of a good-quality tendon; degenerated tendons may require a tendon transfer. Lesions larger than 5 cm should be treated using two tendon transfers and V-Y tendinous flaps. A proper algorithm should be introduced to calibrate the surgical procedures. In addition to tendon defect size, tendon degeneration, etiology of the lesion, and time from injury to surgery are crucial factors that should be considered in the surgical planning.
Underlying Adenocarcinoma of the Lung Metastasizing to the Proximal Phalanx of the Foot Causing Complex Regional Pain Syndrome
Authors: Bazrafshan Sam , Pacheco Maria , Ortiz Julio C.
Published: April 2017

We report an unusual case of adenocarcinoma of the lung metastasizing to the proximal phalanx of the third digit in a 56-year-old woman with overlying complex regional pain syndrome. The patient was initially treated for neuroma, fracture, and neuropathic pain with no improvement over a 4-month period before presenting to the emergency department for left third digit pain. Radiographic imaging showed substantial osteopenia and mottling; magnetic resonance imaging demonstrated an aggressive lesion to the proximal phalanx. The patient underwent excision of the lesion, revealing metastatic moderately differentiated adenocarcinoma.
EED orchestration of heart maturation through interaction with HDACs is H3K27me3-independent
Authors: Ai Shanshan , Peng Yong , Li Chen , Gu Fei , Yu Xianhong , Yue Yanzhu , Ma Qing , Chen Jinghai , Lin Zhiqiang , Zhou Pingzhu , Xie Huafeng , Prendiville Terence W , Zheng Wen , Liu Yuli , Orkin Stuart H , Wang Da-Zhi , Yu Jia , Pu William T , He Aibin
Published: April 2017

In proliferating cells, where most Polycomb repressive complex 2 (PRC2) studies have been performed, gene repression is associated with PRC2 trimethylation of H3K27 (H3K27me3). However, it is uncertain whether PRC2 writing of H3K27me3 is mechanistically required for gene silencing. Here, we studied PRC2 function in postnatal mouse cardiomyocytes, where the paucity of cell division obviates bulk H3K27me3 rewriting after each cell cycle. EED (embryonic ectoderm development) inactivation in the postnatal heart (EedCKO) caused lethal dilated cardiomyopathy. Surprisingly, gene upregulation in EedCKO was not coupled with loss of H3K27me3. Rather, the activating histone mark H3K27ac increased. EED interacted with histone deacetylases (HDACs) and enhanced their catalytic activity. HDAC overexpression normalized EedCKO heart function and expression of derepressed genes. Our results uncovered a non-canonical, H3K27me3-independent EED repressive mechanism that is essential for normal heart function. Our results further illustrate that organ dysfunction due to epigenetic dysregulation can be corrected by epigenetic rewiring.
Steroid hormone induction of temporal gene expression in Drosophila brain neuroblasts generates neuronal and glial diversity
Authors: Syed Mubarak Hussain , Mark Brandon , Doe Chris Q
Published: April 2017

An important question in neuroscience is how stem cells generate neuronal diversity. During Drosophila embryonic development, neural stem cells (neuroblasts) sequentially express transcription factors that generate neuronal diversity; regulation of the embryonic temporal transcription factor cascade is lineage-intrinsic. In contrast, larval neuroblasts generate longer ~50 division lineages, and currently only one mid-larval molecular transition is known: Chinmo/Imp/Lin-28+ neuroblasts transition to Syncrip+ neuroblasts. Here we show that the hormone ecdysone is required to down-regulate Chinmo/Imp and activate Syncrip, plus two late neuroblast factors, Broad and E93. We show that Seven-up triggers Chinmo/Imp to Syncrip/Broad/E93 transition by inducing expression of the Ecdysone receptor in mid-larval neuroblasts, rendering them competent to respond to the systemic hormone ecdysone. Importantly, late temporal gene expression is essential for proper neuronal and glial cell type specification. This is the first example of hormonal regulation of temporal factor expression in Drosophila embryonic or larval neural progenitors.
Profesjonsrettet lærerutdanning for yrkesfag - dagens undervisning og opplevelse av relevans
Authors: Sylte Ann Lisa , Jahanlu David
Published: April 2017

En av de viktigste utfordringene i å forebygge høyt drop-out i skolen er "relevans i utdanningen". Mangelen på sammenheng mellom teori og praksis, kan føre til økende frafall i både yrkesfag- og profesjonsutdanninger, som eksempel lærerutdanning.Denne studien hadde som mål å undersøke opplevd relevans av innhold og undervisningsmetoder i dagens yrkesfaglærerutdanning.En kvantitativ undersøkelse ble gjennomført ved yrkesfaglærerutdanningen, Høgskolen i Oslo og Akershus i Norge.Resultatene viser at relevans av innhold og undervisningsmetoder kan oppleves, når teorien er basert på yrkesoppgaven og det er nær sammenheng mellom teori og praksis. Likedan når det er variasjoner i bruk av undervisningsmetoder tilpasset studenters læreforutsetninger. Dermed kan fokus på relevant innhold og undervisning hjelpe fremtidige lærere til å redusere nivået av frafall i videregående skoler.
Could the Body Roundness Index One Day Replace the BMI?
Authors: Schweitzer Kate
Published: October 2024

This Medical News article discusses a newer measure for assessing health risks associated with fat than the body mass index, and the likelihood of it being adopted in clinical settings.