bluuebunny/crossref_metadata_2025 huggingface dataset:
Thermodynamic analysis of combined cycle plant operation as part of an energy-saving system based on an absorption bromide-lithium refrigerating machine
Authors:   Astrakhan State Technical University, Galimova L. V. , Bairamov D. Z. ,   Astrakhan State Technical University
Published: December 2020

The main directions of research of the current energy-generating system, taking into account its technical limitations, are optimization and forecasting based on the analysis of its operating modes. Thermodynamic analysis involves determining the efficiency of the system based on the research of exergy efficiency and exergy losses. In this project, we propose methodic and results of exergy analysis of combined cycle gas plant operation as an object of energy production, the efficiency which is provided by cooling the outdoor air using an absorption bromide-lithium refrigerating machine. Conducting exergy analysis for determination of exergy destruction allow to determine the potential for increasing the efficiency of the system. A flow graph and an incident matrix are presented. The exergy efficiency of the combined cycle gas plant under the specified conditions is 46,5%. Based on the exergy analysis, the final diagram of the distribution of fluxes and losses of exergy of the combined cycle gas plant is presented
Severity assessment of non-cystic fibrosis bronchiectasis by the FACED score
Authors: Saad Ahmed Ben , Migaou Asma , Fahem Nesrine , Mhamed Saousen Cheikh , Rouatbi Naceur , Joobeur Samah
Published: December 2020

Objectives:

Bronchiectasis (BE) is a major health problem associated with a high morbidity and mortality. This study aimed to determine the relation of the FACED score (a multidimensional score contributing to stratify patients into risk categories) with the severity of non-cystic fibrosis bronchiectasis (NCFB) among our population.

Materials and Methods:

This is a retrospective single center study of 105 consecutive patients with NCFB hospitalized for acute exacerbations (AE) at the Department of Respiratory Medicine of Fattouma Bourguiba Teaching Hospital in Monastir (Tunisia) between January 2005 and December 2017. Patients were divided into two groups (G): G1: FACED Score ≤ 2 and G2: FACED score ≥3. We compared different severity parameters of BE between the two groups.

Results:

The study included 105 patients with NCFB. Patients of G2 had more comorbidities (P = 0.028), an altered respiratory function with a lower forced vital capacity (G1:2.73, G2:1.33 L; P < 0.001), a decreased PaO2 (88 vs. 68 mmHg; P < 0.001), a high CO2 level (P < 0.001), and a higher number of AE/year (0.96, 2.12 AE/year;P < 0.001). Hospitalizations for AE of G2 were characterized by a lower PaO2, a higher PaCO2 (P < 0.001), a longer course of antibiotic (P < 0.001) with an extended hospitalization (P = 0.007). An ultimate evolution toward chronic respiratory failure was more common in G2 (P < 0.001).

Conclusion:

A high FACED score is associated with more symptoms, an altered respiratory function, a higher number and more severe AE, more health-care utilization with worse outcomes. Further studies are necessary to evaluate the impact of such scales in clinical practice.
V.I. Lenin State Library of the USSR during the Great Patriotic War: Preparation and Release of Bibliographic Publications
Authors: Gubina Elena V. , Levin Grigoriy L. , Maslovskaya Nadezhda S.
Published: December 2020

In the year of the 75th anniversary of the Great Victory, the authors consider the activity of the V.I. Lenin State Library of the USSR (GBL) on preparation and release of bibliographic publications during the Great Patriotic War. This topic was covered in the specialized literature briefly and fragmentally (with the exception of work in the field of recommendation bibliography). The aim of the article is to fill in the existing gaps in the study of this area of GBL activity during the war.

In the pre-war years, the GBL transformed into one of the leading bibliographic centres of the country — both reference and bibliographing. Both directions were mainly concentrated in the Scientific Bibliographic Department, where at the turn of the 1930s and 1940s preparation of bibliographic publications was structurally distinguished.

With the beginning of the war, the GBL reorganized its work in accordance with the conditions and tasks of wartime. The amount of bibliographic work in the first months of the war was significantly reduced. Publishing activities, including the production of bibliographic publications, ceased and resumed in the second half of 1942. Recommendation indexes and lists on actual subjects were the main type of bibliographic materials created and published by the GBL during the war years.

The article highlights the activities of two leading bibliographic departments of the GBL during this period: the Scientific Bibliographic Department and the Military Department. There are two areas of activity of the Scientific Bibliographic Department: general and scientific-auxiliary bibliography and recommendation bibliography. During the Great Patriotic War, the library produced mainly reference manuals, as well as also prepared several scientific publications. The authors present employees of both departments who have made the most significant contribution to the preparation of bibliographic publications. In addition, the article notes several bibliographic publications created in other structural divisions.
Representation of History of Russian Science on the Pages of Electronic Calendars of Significant and Memorable Dates
Authors: Yudina Inna G. , Bazyleva Elena A.
Published: December 2020

In view of approaching the 300th anniversary of the Russian Academy of Sciences and in connection with the relevance of the topic, the authors have prepared review of the resources devoted to the history of Russian science. The key moments of history, events from the lives of prominent people are reflected on the pages of calendars of significant and memorable dates. The uniqueness of these publications lies in the fact that they bring together diverse facts, while the materials are systematized in accordance with the chronology and upcoming anniversaries. Attracting a large amount of factual information makes calendars an indispensable tool for planning communication and organizational mass activities of various institutions.

The purpose of this work is to identify information products of chronological nature, to study the specifics of providing information in them about Russian science, as well as structural, format and technological features of implementation of selected resources. In the course of monitoring the web space, we found about thirty narrowly theme-based electronic resources. Further, we carefully analysed each resource in accordance with the evaluation criteria on content, structure and implementation technology. We selected about half of the identified resources for more detailed study. Due to the fact that electronic calendars of significant and memorable dates are formed by various organizations — academic and University libraries, archives, research institutes, etc., the authors decided to group resources according to the type of institutions that prepared them, and to describe them in accordance with this principle. The largest number of electronic calendars was found on the websites of research institutions and University libraries. As for the personnel of the Russian Academy of Sciences, the most complete and voluminous resource in its content is formed by the Archive of the Russian Academy of Sciences. Analysis of the content of calendars indicates that their content may be limited to the history of particular institution, research centre or regional branch of the Russian Academy of Sciences. The exception is the resource “Anniversaries of the Members of RAS” by the RAS Archive, which gives the idea of the Academy’s personnel potential throughout its history.

It is obvious that the work on the formation and promotion of resources in the electronic environment that highlight significant events in the history of the Russian Academy of Sciences contributes to the dissemination of knowledge about scientists, scientific achievements and developments of research institutes and is effective means of popularizing science.
Publications of General Academic Series “Scientific-Biographical Literature” in 2015—2019
Authors: Valkova Olga A.
Published: December 2020

General academic series “Scientific-biographical literature” exists under the Presidium of the Russian Academy of Sciences on the basis of the S.I. Vavilov Institute for the History of Science and Technology of RAS. Founded in 1959, it celebrated 60th anniversary in 2019. During this time, the series published about 700 original biographies of scientists, engineers and inventors, both Russian and foreign. In the period of 2015-2019, the series published four monographs representing the biographies of botanist A.N. Petunnikov (1842—1919) by G.I. Lubina, biologist N.N. Novikov (1876—1964) by T.I. Ulyankina, biochemist V.S. Gulevich (1867—1933) by T.V. Bogatova, and physicist Pierre-Gilles de Gennes (1932—2007) by A.A. Sonin. All these publications contain a large number of unique visual materials; this has already become a tradition for books in the series “Scientific-biographical literature”. They also have standard annex for the series, including list of the main dates of life and creative activity, reference lists of scientific works of book characters, and lists of literature about them. During the reviewed period, several manuscripts were approved for publication by the editorial Board of the series and included in the publishing plan of the Publishing house “Nauka”, but due to financial difficulties, they were not published in the series format. However, the prepared manuscripts have already been published in other publishing houses or are at the stage of editorial and publishing preparation. Among them there are biographies of French physicist, Nobel Prize winner Louis de Broglie (1892—1987) by A.F. Smyk; palaeontologist V.P. Amalitskiy (1860—1917) by V.I. Onoprienko; Honorary member of the USSR Academy of Science, palaeontologist M.V. Pavlova (1854—1938) by G.I. Lyubina and Z.A. Bessudnova; astronomer N.M. Subbotina (1877—1961) by O.A. Valkova. Currently, in 2020, no new publications are planned within the framework of the general academic series “Scientific-biographical literature”.
Russian Print in North-East Asia: To the Compilation of the Catalogue of Hamilton Library of the University of Hawaii
Authors: Khisamutdinov Amir A.
Published: December 2020

The article considers the Russian printing in the countries of the Asia-Pacific region (China, Japan, Korea, USA, etc.). The author offers the review of literature published in Russian in these countries, basing on the materials of the Russian North-East Asian collection of Hamilton Library of the University of Hawaii (Honolulu, USA), which is one of the best collections in the world on this subject. The article reports on the history of the Russian collection and its creators. The author discusses the terms “Russian book Diaspora” (publishing emigrant activities within the same country — China, Japan, USA, etc.) and “Russian book community” (publishing activities of people from Russia within the same city, such as Harbin, Shanghai, Tokyo; organizations or groups of individuals, etc.). Special attention is paid to the bibliographic description of this collection, which was first published in 2002 in the publishing house of the Russian State Library “Pashkov Dom” (“Russian print in China, Japan and Korea: Catalogue of the collection of Hamilton Library of the University of Hawaii”) and reprinted in the expanded version in 2016 under the title “Russian print in the Asia-Pacific region” (in 4 parts). The article also reports on other foreign collections that contain emigrant publications, including those printed in the countries of the Asia-Pacific region (the libraries of the University of California in Berkeley, the Hoover Institute for war, revolution and peace, and the Museum of Russian culture in San Francisco). The author presents the data on the work of scientific centre of the University of Hawaii for the study of the USSR / Russia “Soviet Union in Pacific Asia Rim”. The article analyses international cooperation of the University of Hawaii library with Russian libraries, in particular, its relations with the libraries of the Russian Far East. The author describes the project of the University of Hawaii Library to create the electronic library catalogue with complete bibliographic and historical information about each edition of the collection and to expand the exchange of literature and information.
Middle Volga Cooperative Publishing House in 1918—1919 (Based on the Documents of the Central State Archive of Samara Region)
Authors: Kurmaev Mikhail V.
Published: December 2020

The history of book publishing in Russia during the Civil War is studied extremely insufficiently, especially in the territories that left the Russian Soviet Federative Socialist Republic in the summer of 1918. Among the “white spots” there are activities of the Middle Volga Cooperative Publishing House, opened in Samara in July 1918 after the capture of the city by the parts of the Czechoslovak Corps. The article, for the first time on the basis of the analysis of documents of the Central State Archive of the Samara Region (CGASO) and published sources, attempts the reconstruction of the history of this institution, shows the main stages of its formation and development in the context of confrontation of two models of statehood: Bolsheviks and SR-Mensheviks. The author provides materials showing that the Middle Volga Cooperative Publishing House was created from the very beginning as an interregional one, since it was supposed to serve schools in four provinces (Samara, Simbirsk, Ufa and Orenburg) and the Ural Region, controlled by the government of the Committee of Members of the Constituent Assembly. In the face of shortage of textbooks, that publishing house, being isolated from Moscow and Petrograd, became a temporary centre for supplying educational institutions in the Volga region and the Cis-Urals with textbooks and writing accessories. Analysing the documents preserved in the CGASO, the author shows the self-sacrificing activity of board member Nikolay Andreevich Kalugin, who, after the return of Soviet power to Samara, was able to defend the publishing and bookselling base of the city’s cooperative associations from the encroachments of the Provincial Department of public education. The article reveals the repertoire of books published by the Middle Volga Cooperative Publishing House in 1918—1919 and estimates the degree of rarity of individual publications, not all of which are revealed in the collections of modern Russian libraries.
“Library Environment and Space” is New Academic Discipline at the East-Siberian State Institute of Culture
Authors: Ezova Svetlana A. , Kuchmurukova Ekaterina A.
Published: December 2020

The article is devoted to the theoretical justification of the training course “Library environment and space” and the experience of teaching it at the Department of library and information resources of the East Siberian State Institute of Culture (VSGIK). Interaction of library, environment and space is studied using environmental, contextual and spatial approaches. In order to clarify the system of terminology, the authors analyse publications of well-known specialists in library science considering the features of library environment and space. The authors determine the contexts of library and information activities in the library, being socio-cultural institution: physical, historical, communicative, social, ethical, etc. Contextual approach is considered from the perspective of structure of library and information activities. The article indicates the ways of organizing space and environment under the provisions of the “Model standard of public libraries”, as well as the “Concept of modernization of municipal libraries of the Russian Federation on the basis of model standard of public libraries” and “Guidelines for modernization of municipal libraries based on the model standard of public libraries”.

The authors generalize the experience of the East Siberian State Institute of Culture in studying library space in the framework of scientific conferences held and educational programs implemented. The article characterizes the authorial discipline “Library environment and space” approbated at the VSGIK in 2016. The authors prove feasibility of its introduction into the Master’s curriculum, reveal goals and objectives of the course, its interconnection with other disciplines, give the fragments of the educational program. The article describes the method of applying the innovative methods of mental maps, puzzle technologies, which help through visualization of objects of study to develop associative perception, imagination, teamwork, collaboration and co-creation, which are important for organizing library environment and space in the public library. Special attention is paid to the specific features of the final lesson, the main form of which is the discussion on the topic “Model library: pros and cons”.

The authors consider it justified to introduce the discipline “Library environment and space” into the Master’s educational course of study to form the competence PC-3 “Ability to create and maintain an open, psychologically comfortable library environment”.
Manajemen Persatuan Bola Basket Seluruh Indonesia (PERBASI) Kabupaten Tanggamus
Authors: Siswoyo Joan , Cahyadi Ardian , Wicaksono Lungit
Published: December 2020

This study aims to produce: (1) Model of management program implementation in PERBASI (Indonesian Basketball Association) Tanggamus Regency, (2) Model of management system and basketball coaching in PERBASI Tanggamus Regency. This is a qualitative research study looking at different aspects of sport organization in this region. The research subjects are: (1) Branch manager of PERBASI Tanggamus (2) Manager of PERBASI Tanggamus (3) Sports agencies in the Tanggamus Regency, (4) athletes, coaches, communities. Data collection was performed by using observation, interviews and documentation. The data analysis technique used was triangulation. The results showed that: (1) Branch manager of PERBASI in carrying out organizational management does not have a system of implementing the program, (2) The basketball coaching system at Tanggamus has not been designed to be sustainable, (3) The sports coaching system at Tanggamus is not running optimally. The management system of the organization, basketball and sports in Tanggamus Regency is not yet running well. Based on the results, it proposes an ideal model of sports management (1) the ideal model of basketball management in PERBASI Tanggamus, (2) the ideal model of a management system. The conclusion of the research states that the implementation of basketball management and coaching in Tanggamus Regency has not been programmed efficiently. Results of this research suggest that all parties involved in a basketball sports coaching system in Tanggamus Regency should cooperate in implementing management programs.
Ten Essential Delocalization Learning Outcomes: How Well Are They Achieved?
Authors: Carle Myriam S. , El Issa Romeo Junior , Pilote Nicolas , Flynn Alison B.
Published: December 2020

Delocalization (resonance) is a concept in organic chemistry that influences the chemical reactivity, structure, and physical properties of molecules. However, the concept has proven challenging for students and the related learning outcomes had previously been only vaguely defined. We recently defined ten essential learning outcomes about delocalization that a student should be able to demonstrate by the end of a two-course organic chemistry sequence. The goal of the present study was to investigate to what extent the ten LOs were achieved by students, as well as the connections between the LOs. We analyzed three exam questions related to seven of the ten LOs for the degree of achievement, common errors, and scientific reasoning. We found that students sometimes struggled to identify when delocalization could occur, that some of the LOs built on one another, and that students were more successful in drawing resonance structures when explicitly asked, but less successful when the requirement was implicit or embedded within a mechanism. Our analysis of student reasoning showed that the dominant modes of reasoning were aligned with the related expectations and explanations in the course. When asked to justify the contribution of resonance structures to the resonance hybrid, most answers used a descriptive mode of reasoning; when asked to explain why a given proton was more acidic than another, most answers contained relational and linear causal reasoning. Implications for research and practice are discussed.
Highly Sterically Encumbered Gold Acyclic Diaminocarbene Complexes: Overriding Electronic Control in Regiodivergent Gold Catalysis
Authors: Ruch Aaron , ellison matthew , Nguyen John , Kong Fanji , Handa Sachin , Nesterov Vladimir , Slaughter LeGrande
Published: December 2020

Two series of sterically encumbered gold(I)-acyclic diaminocarbene (ADC) complexes were prepared by reaction of mono- and dialkylamines with gold-bound 2-mesitylphenyl isocyanide (monomesityl series) and 2,6-dimesitylphenyl isocyanide (dimesityl series). X-ray crystal structures and solution 1H NMR data showed that the ADC-gold complexes adopt major rotameric conformations with the bulky biaryl/terphenyl group and one alkyl group located syn to gold. This engenders substantial steric hindrance at the metal, as evidenced by percent buried volume (%Vbur) parameters of 35.7 – 37.2 for the monomesityl series and 46.4 – 52.4 for the dimesityl series. Modest out-of-plane distortions of the ADC N-substituents in the dimesityl series were attributed to attractive CH···π interactions between alkyl groups and mesityl rings on the basis of dispersion-corrected density functional theory calculations. Gold-catalyzed regiodivergent domino cyclization/hydroarylation reactions of a 1,6-enyne with indole revealed that the bulky biaryl/terphenyl substituents of the ligands exert a strong influence on product selectivity, with the bulkier dimesityl ADC-Au catalysts inducing a shift away from the cyclopropane-fused product toward the normally disfavored alkene product. Incorporation of a yet bulkier bis(2,6-diisopropylphenyl)-substituted terphenyl moiety into the ADC led to a gold catalyst that provided exclusive selectivity for the alkene product. Computational modeling suggested that bulky terphenyl groups hinder attack at the a carbon in the initially formed organogold intermediate, allowing steric effects to override the intrinsic electronic preference for the cyclopropane product.
Diastereoselective Synthesis of Spiro and Chlorocyclopropanes from Camphorpyrazolidinone derived -Unsaturated Amides
Authors: Gondi Sudershan Reddy
Published: December 2020

High diastereoselectivity are observed in the addition of gem-dichlorocarbene to an optically pure a,b-unsaturated amides derived from a chiral camphorpyrazolidinone. A novel route to the asymmetric synthesis of spiro [2,2]-pentane carboxylic acid esters derivatives through gem-dichlorocyclopropane is described.
TD-DFT and Experimental Methods for Unraveling the Energy Distribution of Charge-Transfer Triplet/Singlet States of a TADF Molecule in a Frozen Matrix
Authors: Woo Seung-Je , Kim Jang-Joo
Published: December 2020

Reverse intersystem crossing (RISC) rate of a thermally activated delayed fluorescence (TADF) molecule is sensitive to the energy alignment of singlet charge-transfer state (1CT), triplet charge-transfer state (3CT), and locally excited triplet state (3LE). However, the energy distribution of the charge-transfer states originating from the conformational distribution of TADF molecules in a solid matrix inevitably generated during the preparation of a solid sample due to the rotatable donor-acceptor linkage is rarely considered. Moreover, the investigation of the energy distribution of the 3CT state is both theoretically and experimentally difficult due to the triplet instabilities of time-dependent density functional (TD-DFT) calculations and difficulties in phosphorescence measurements, respectively. As a result, the relation between conformational distribution, configurations of excited state transition orbitals, and excited state energies/dynamics have not been clearly explained. In this work, we determined the energy distribution of CT states of the TADF emitter TPSA in frozen toluene at 77 K by the measurement of time-resolved spectra in the full time range (1 ns ~ 30 s) of emission including prompt fluorescence, TADF, 3CT phosphorescence, and 3LE phosphorescence. We obtained the energy band of CT states where 1CT and 3CT states are distributed in the range of 2.85-3.00 eV and 2.64-2.96 eV, respectively. We tested various global hybrid and long-range corrected functionals for the TD-DFT calculation of 3CT energy of TPSA and found that only the M11 functional shows consistent results without triplet instability. We performed TD-DFT with the M11* functional optimized for robust dihedral angle scan of 3CT states without triplet instability and reproduced the energy band structure obtained from the experiment. Through TD-DFT and experimental investigations, it is estimated that the dihedral angle of donor-acceptor (θD-A) and acceptor-linker (θA) of TPSA in frozen toluene lie within the range of 70°≤θD-A≤90° and 0°≤θA≤30° respectively. Our results show that the dihedral angle distribution must be considered for further investigation of the photophysics of TADF molecules and the development of stable and efficient TADF emitters.
Synthesis of 4,5-Benzotropone Pi-Complexes of Iron, Rhodium and Iridium and Their Potential Use in Catalytic Borrowing Hydrogen Reactions
Authors: Kodama Takuya , Kawashima Yuki , Deng Zhirong , Tobisu Mamoru
Published: December 2020

The synthesis of rhodium, iridium, and iron pi-complexes bearing 4,5-benzotropone ligands are reported. X-ray crystallographic analyses revealed that a tropone core coordinates to a metal center in a eta4 manner with a tub-form geometry. Some of the benzotropone p-complexes exhibited catalytic activity for the N-alkylation of aniline via borrowing hydrogen.
Multiscale Simulations of SARS-CoV-2 3CL Protease Inhibition with Aldehyde Derivatives. Role of Protein and Inhibitor Conformational Dynamics in the Reaction Mechanism
Authors: Ramos-Guzmán Carlos A. , Ruiz-Pernía J. Javier , Tuñón Iñaki
Published: December 2020

We here investigate the mechanism of SARS-CoV-2 3CL protease inhibition by one of the most promising families of inhibitors, those containing an aldehyde group as warhead. These compounds are covalent inhibitors that inactivate the protease forming a stable hemithioacetal complex. Inhibitor 11a is a potent inhibitor that has been already tested in vitro and in animals. Using a combination of classical and QM/MM simulations we determined the binding mode of the inhibitor into the active site and the preferred rotameric state of the catalytic histidine. In the noncovalent complex the aldehyde group is accommodated into the oxyanion hole formed by the NH main chain groups of residues 143 to 145. In this pose, P1-P3 groups of the inhibitor mimic the interactions established by the natural peptide substrate. The reaction is initiated with the formation of the catalytic dyad ion pair after a proton transfer from Cys145 to His41. From this activated state, covalent inhibition proceeds with the nucleophilic attack of the deprotonated Sg atom of Cys145 to the aldehyde carbon atom and a water mediated proton transfer from the Ne atom of His41 to the aldehyde oxygen atom. Our proposed reaction transition state structure is validated by comparison with x-ray data of recently reported inhibitors, while the activation free energy obtained from our simulations agrees with the experimentally derived value, supporting the validity of our findings. Our study stresses the interplay between the conformational dynamics of the inhibitor and the protein with the inhibition mechanism and the importance of including conformational diversity for accurate predictions about the inhibition of the main protease of SARS-CoV-2. The conclusions derived from our work can also be used to rationalize the behavior of other recently proposed inhibitor compounds, including aldehydes and ketones with high inhibitory potency.
MM-PBSA and the Importance of the Dielectric Constant for Kinase Drug Design
Authors: Schneider Melanie , Labesse Gilles
Published: December 2020

Predicting the interactions between a set of small molecules and its target plays a critical role in drug discovery and development. Especially in later stages of the drug design process, when a reduced set of molecules is in focus, reliable and accurate binding affinity estimations are important for targeted modifications of given lead molecules.Current limitations in affinity prediction originate from the lack of accurate estimates for solvation energy and entropy. MM-PBSA and the related MM-GBSA aim at providing better estimates.From our studies we infer that the common approach using one dielectric constant for the binding pocket may be misleading (here in the case of a kinase), especially when designed ligands/drugs contain charges. Thus, a range of selected values for the solute dielectric constant is preferred for better and more reliable comparisons.
O ENSINO DE CIÊNCIAS: ESPECIFICIDADES PEDAGÓGICAS ENTRE O DIZER E O FAZER
Authors: Kurz Débora Luana , Bedin Everton , Groenwald Claudia Lisete Oliveira
Published: December 2020

Considerando as especificidades e as implicações das narrativas de três professoras, bem como as particularidades da ação pedagógica destas à luz do contexto escolar, no intuito de averiguar indícios da área das Ciências da Natureza em meio à prática pedagógica, buscou-se analisar, refletir e discutir sobre as possibilidades desencadeadas por estas para o acesso à cultura científica aos alunos desde o início do processo de escolarização. Os dados foram coletados por meio da observação e posterior transcrição em um diário de bordo, além da aplicação de um questionário analisado no viés qualitativo da pesquisa fenomenológico-hermenêutica. Nesse sentido, pontua-se que apesar de haver um consenso em relação a importância do ensino de Ciências da Natureza no início do processo de escolarização, evidencia-se limitados indícios de Ciências tanto na narrativa das professoras quanto durante o período de observação das aulas. É necessário que esta discussão permeie os processos de formação de professores, e que a mesma seja contemplada de forma articulada à BNCC.
Design, validation, and reliability
of an observational notational instrument for the
football goalkeeper’s defensive and offensive technical-tactical actions
Authors: Jara Daniel , Gómez Miguel-Ángel , Ortega Enrique , Sainz de Baranda Pilar
Published: December 2020

The aim of this study was to design and validate an
observational instrument used to analyse the in-game behaviour of the football
goalkeeper (GK) in defence and attack. The validation and reliability testing
processes were carried out by twelve experts through five steps. Contents
validity was calculated using Aiken’s V and the kappa index was used to analyse
reliability. The observational tool was divided into three different content
blocks: GK’s offensive actions, GK’s defensive actions, and opponent’s actions
taken before a GK’s defensive action. Only three out of the total of 24 items
achieved low values that, after modifications, recorded optimal values (values
higher than .90) in accordance with the Aiken’s V. Following step one, new
proposals were evaluated after a pilot test. The reliability test scored
optimal values (values higher than .85). An observational sheet was developed
to manage the quantitative and qualitative assessments of experts, and the
proposed tool was accepted as valid and reliable.
Metapoética da terra em Carlos Dias Fernandes
Authors: Tavares Leonardo de Sousa Oliveira
Published: December 2020

Ensaio sobre três poemas de Carlos Dias Fernandes, baseado na metapoética bachelardiana e inspirado por uma motivação fenomenológica derivada de Husserl, nossa análise busca extrair dos versos escolhidos os elementos constituintes do imaginário profundo, da arquetipologia visível nas formas gerais da cosmovisão poética que descreve e vê o mundo, por intermédio de uma experiência estética peculiar. Após a apresentação de nosso arcabouço teórico, segue-se uma breve análise dos poemas e de sua relação com os componentes terrestres para a caracterização da condição humana diante do universo, na exposição de mais um modo de achegar-se ao fenômeno vivido e, consequentemente, do mundo da vida em seu caráter elemental. Segundo os poemas selecionados, de acordo com a face poética apresentada, Carlos Dias Fernandes é, acima de tudo, um poeta da terra fortalecido pelo imaginário da solidez reflexiva e por devaneios fixos.
Konut Bahçelerinin Bitkisel Tasarımında İçilebilir Türlerin Kullanımı Üzerine Kullanıcı Görüşleri: İzmir İli Örneği
Authors: ÇAKAR Handan , AKAT Hülya , AKAT SARAÇOĞLU Özlem
Published: December 2020

Araştırmanın amacı; konut bahçelerinde bitkisel çay olarak değerlendirilebilen türlerin kullanımı ile içilebilir peyzaj tasarımına yönelik yeni bir peyzaj yaklaşımı oluşturmak için kullanıcıların görüşlerini tespit etmek ve içilebilir peyzaj tasarımı ile ilgili öneriler geliştirmektir. Bu doğrultuda İzmir ilinin 11 ilçesindeki konut bahçesine sahip 182 kullanıcı üzerinde anket çalışması gerçekleştirilmiştir. Araştırmada konut sakinleri, içilebilir bitki türlerinin konut bahçesinde kullanımını olumlu karşılayarak içilebilir peyzaj tasarımlarının gerçekleştirilmesi sonucu bahçelerde geçirecekleri sürenin artacağını ve markalı ürünler ile kıyaslandığında bu ürünleri rahatlıkla bahçelerinden tüketebileceklerini ifade etmişlerdir. Elde edilen tüm bulgulara göre; içilebilir peyzaj tasarımı yaklaşımının, yenilebilir peyzaj anlayışına yeni bir alternatif oluşturacağı sonucuna ulaşılmıştır.
Effectiveness of Using Gamification Media for Mastering Indonesian Afficiates in Thailand Students at Universitas Islam Darul ‘Ulum Lamongan
Authors: Ihsan Bisarul , Soniatin Yessy
Published: December 2020

This study aims to see the response of students from Thailand at the Universitas Islam Darul ‘Ulum Lamongan to the use of gamification media, as well as to see the effectiveness of the acquisition of Indonesian affixation by Thai students using gamification media. This research uses descriptive method, with observation and test data collection techniques. The results of this study are the highest response to statement 1 of 92.3%, namely in the very interesting category, the highest response to the second statement of 100%, namely in category 4, the highest response to statement 3 of 61.5% namely in category 4, the highest response to statement 4th is 80.8% in category 4, and the highest response is to statement 5 of 61.5% in category 4. The effectiveness results in cycle I reach 391 words with Indonesian affixes, then in cycle II, it increases by 196 so that in cycle II data is obtained as large as 587 words with affixes.
A study comparing Conventional Heating and Microwave Assistance Heating to Recover Metals from Municipal Solid Waste using Microwave-Assisted Leaching Technique
Authors: Khan Mariam , Al ghouti Mohammad , Nasser Mustafa , Al Kuwari Khalid , Heng Oon
Published: December 2020

This study investigates and compares microwave-heating radiation with conventional heating. Incinerated municipal solid waste (IMSW) bottom ash (BA) and fly ash (FA) was utilized to recover various metals including Co, Cr, Cu, Fe, Mn, Zn,Pb, Al, Cd, Ba, Mg and V using various acid leaching agents i.e. HCl, HNO3 and H3PO4 were utilized and several parameters were altered in order to determine the most effective conditions. The current study concluded that microwave assisted leaching method is effective to recover most of the metals. In addtion, metals from MSWBA were much easier to recover in contrast with MSW-FA. 71% of Co, 75.69% of Cr, 56.19% of Cd, 35.23% of Ba and 30.2% of Pb, using 2M of HCl and 3M of H3PO4. While 1.48% of Cr, 0.93% of Fe, 1.19% of Mn, and 1.18% of Al were extracted using HCL and H3PO4 from MSWFA. It was also confirmed that higher power and longer contact time had a positive effect on metal recovery. From cost analysis point of view, microwave assisted leaching was fraction of the cost for conventional heating, making this method comparatively sustainable, energy efficient and safe.
Linking Depositional Environments and Diagenetic Processes to Porosity Evolution and destruction in the Arab Formation reservoirs, Offshore oilfields of Qatar
Authors: Sadooni Fadhil N. , Al-Kuwari Hamad Al-Saad , Sakhaee-Pour Ahmad , Matter Wael S.
Published: December 2020

Introduction: The Jurassic Arab Formation is the main oil reservoir in Qatar. The Formation consists of a succession of limestone, dolomite, and anhydrite. Materials and methods: A multi-proxy approach has been used to study the Formation. This approach is based on core analysis, thin sections, and log data in selected wells in Qatar. Results: The reservoir has been divided into a set of distinctive petrophysical units. The Arab Formation consists of cyclic sediments of oolitic grainstone/packstone, foraminifera-bearing packstone-wackestone, lagoonal mudstone and dolomite, alternating with anhydrite. The sediments underwent a series of diagenetic processes such as leaching, micritization, cementation, dolomitization and fracturing. The impact of these diagenetic processes on the different depositional fabrics created a complex porosity system. So, in some cases there is preserved depositional porosity such as the intergranular porosity in the oolitic grainstone, but in other cases, diagenetic cementation blocked the same pores and eventually destroyed them. In other cases, diagenesis improved the texture of non-porous depositional texture such as mudstone through incipient dolomitization creating inter-crystalline porosity. Dissolution created vugs and void secondary porosity in otherwise non-porous foraminiferal wackestone and packstone. Therefore, creating a matrix of depositional fabrics versus diagenetic processes enabled the identification of different situations in which porosity was either created or destroyed. Future Directions: By correlating the collected petrographic data with logs, it will become possible to identify certain “facio-diagenetic” signatures on logs which will be very useful in both exploration and production. Studying the micro and nano-porosity will provide a better understanding of the evolution and destruction of its porosity system.
Do Oil and Gas Revenues promote Economic Diversification in Qatar?
Authors: Charfeddine Lanouar , Barkat Karim
Published: December 2020

The aim of this paper is to explore the short- and long-term asymmetric impact of oil prices shocks and oil and gas revenues changes on the total real GDP, and the level of economic diversification of the Qatar economy. To this end, two econometric approaches have been used: (1) the A-B structural vector autoregressive (AB − SVARX) model with exogenous variables where four different asymmetric oil prices and oil and gas revenues measures have been employed, and (2) the nonlinear autoregressive distributed lag (NARDL) model. The results show that, in the short-run, the responses of both total real GDP and non-oil real GDP to negative shocks on real oil prices and real oil and gas revenues are higher than the impact of positive shocks, indicating evidence for the existence of asymmetric impact of shocks in the short-run. However, the results suggest that the impact of shocks do not last more than three quarters. This evidence for the existence of asymmetric behavior is also confirmed by the NARDL analysis, which shows that, in the long run, positive oil prices shocks and oil and gas revenues changes have higher impact on the two proxies of economic activity than negative changes do. A result that confirms the resilience of the Qatar economy to negative shocks and the positive role played by the energy sector in improving the Qatar economic diversification degree. Finally, the results show that the non-oil sector is completely resilient to negative shocks in the long run as the impact of negative shocks are insignificant on the non-oil real GDP. Several policies aimed to improve the level of economic diversification of the country and delink the government revenues from oil and gas revenues are proposed and discussed.
Piezoelectric Nanogenerators based on Pvdf-Hfp/Zno Mesoporous Silica Nanocomposites for Self-Powering Devices
Authors: Abdul-kareem Asma Abdulgader , AlSanari Noura , Daifallah Amal , Mohamed Radwa , Bhadra Jolly , Ponnamma Deepalekshmi , Al-Thani Noora
Published: December 2020

Due to the rising global concern over energy catastrophe and environmental issues, attention has been diverted towards future energy. In recent times, rechargeable power and renewable energy sources have been considered as an attractive substitute for resolving the future environmental problems. Among them, mechanical energy is one of the most abundant energy sources, and easily transformable to other useful energy forms, such as electrical energy. For such purposes, piezoelectric materials with ability to convert the mechanical energy generated by various activities into electrical energy. In this research work, we have investigated the morphology, structure and piezoelectric performances of neat polyvinylidene fluoride hexafluoropropylene (PVDF-HFP), PVDF-HFP/ZnO, PVDFHFP/ Mesoporous silica, PVDF-HFP 1% and PVDF-HFP 3% ZnO-Mesoporous silica nanofibers, fabricated by electrospinning. Both SEM and TEM images of ZnO nanoparticles shows formation of uniform flake of about 5nm diameter and Mesoporous silica shows uniform spherical morphology with average diameter of 5 μm. EDX plot justifies the presences of Zn, O and Si. An increase in the amount of crystalline β-phase of PVDF-HFP has been observed with the introduction of ZnO and mesoporous silica in the PVDF-HFP matrix are observed in FTIR spectra. All the XRD peaks observed in neat PVDF has the strongest intensity compared to rest of the other XRD peaks of polymer nanocomposite. The XRD spectra of all the nanocomposites have peaks at 17.8°, 18.6° correspond to α- crystalline phase, the peaks observed at 19°, 20.1° correspond to the γ- crystalline phase, and the peak at 20.6° corresponds to the β- crystalline phase. The flexible nanogenerator manipulated from the polymer nanocomposite with 1% ZnO-Mesoporous silica exhibits an output voltage as high as 2 V compared with the neat PVDF-HFP sample (~120 mV). These results indicate that the investigated nanocomposite is appropriate for fabricating various flexible and wearable self-powered electrical devices and systems.
Overview of Polymers for Improved Oil Recovery Treatments
Authors: Shamlooh1 Mohamed Saeed , Hamza Ahmed , Hussein Ibnelwaleed , Nasser Mustafa , Salehi Saeed
Published: December 2020

High water production in oil and gas wells reduces significantly the recovery factor. Mechanical as well as chemical methods are applied to shut off water productive zones. Crosslinked polymers showed high efficiency to seal off water zones in high permeability sandstone and fractured carbonate reservoirs. Moreover, emulsified polymeric formulations have been introduced for deep profile modification by changing the wettability of the rock and hence allowing selective plugging of water. This poster provides an overview of the polymeric formulations used for such application.
Novel Method for the production of Water from Humid Environment of Qatar
Authors: Siddiqui Hammad , Fayyaz Osama , Zaidi Syed
Published: December 2020

Water scarcity is the major challenge of the upcoming decades for the entire world. Middle eastern nations are prone to water scarcity due to very less rainfall, scarce fresh water sources, sandy surroundings and harsh humid climatic conditions. Qatar being the leader of natural gas production suffers from the same problem of pure and clean water. Water desalination techniques adopted so far are energy intensive and unknown to oceanic habitat. The use of vapor compression cycle for the condensation of atmospheric water vapor has various limitations such as complex machinery, high power consumption and periodical maintenance. This novel method utilizes heavy humid conditions of Qatar to obtain water from the atmosphere through Peltier Effect. This method uses the dissimilarity of the conductors in the electric circuit such that the current is made to flow through the circuit and the heating and cooling effects are generated at the junctions where cooling temperature of the junction can be achieved below the dew point temperature thus forming the dew which is collected in the closed container as condensed atmospheric water. This technique is superior to other conventional methods of water production due to its cost efficiency, energy saving, simple machinery and portability of the entire system.
The use of Principle Component Analysis and MALDI-TOF MS for the differentiation of mineral forming Virgibacillus and Bacillus species isolated from Sabkhas
Authors: Abdel Samad Rim , Al Disi Zulfa , Ashfaq Mohammad , Zouari Nabil
Published: December 2020

Occurrence of mineral forming and other bacteria in mats is well demonstrated. However, their high diversity shown by ribotyping was not explained, although it could explain the diversity of formed minerals. Common biomarkers as well as phylogenic relationships are useful tools to clustering the isolates and predict their potential role in the natural niche. In this study, combination of MALDI-TOF MS with PCA was shown a powerful tool to categorize 35 mineral forming bacterial strains isolated from Dohat Fshaikh sabkha, at northwest of Qatar (23 from decaying mats and 12 from living ones). 23 strains from decaying mats belong to Virgibacillus genus as identified by ribotyping and are shown highly involved in formation of protodolomite and a diversity of minerals. They were used as internal references in categorization of sabkha bacteria. Combination of isolation of bacteria on selective mineral forming media, their MALDI TOF MS protein profiling and PCA analysis established their relationship in a phyloproteomic based on protein biomarkers including m/z 4905, 3265, 5240, 6430, 7765, and 9815. PCA analysis clustered the studied strains into 3 major clusters, showing strong correspondence to the 3 phyloproteiomic groups that were established by the dendrogram. Both clustering analysis means have evidently demonstrated a relationship between known Virgibacillus strains and other related bacteria based on profiling of their synthesized proteins. Thus, larger populations of bacteria in mats can be easily screened for their potential to exhibit certain activities, which is of ecological, environmental and biotechnological significance.