bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental investigation of the effect of wave turbulators on heat transfer in pipes
Authors: Karagoz Sendogan , Erzincanli Semih , Yildirim Orhan , Firat Ilker , Kaya Mehmet , Comakli Omer , Omeroglu Gokhan
Published: May 2021

This experimental study deals with the heat transfer and friction effects of sinusoidal part turbulators for single-phase flows occurring in a circular shaped pipe. Turbulators with three different radius values are placed in the pipe to make the flow turbulent. In this way, changes in Nusselt number and friction coefficient are examined. As a result of the experiments made with Reynolds numbers in the range of 6614-20710, the increase rates of the Nusselt numbers of turbulators with 20 mm, 110 mm, and 220 mm radius compared to the empty pipe were obtained as 153.49%, 85.36%, and 52.09%, respectively. As a result of the decrease in the radius, there was an increase in the Nusselt number and the friction factor. Parallel to the Nusselt number, the highest friction factor was obtained in the smallest radius turbulator. It was found that the thermal enhancement factors of 110 mm and 220 mm radius turbulators increased by 179.54% and 132.95%, respectively, compared to the 20 mm radius turbulator. Similarly, it was determined that the thermal enhancement factor of the 110 mm radius turbulator increased by 20% compared to the 220 mm radius turbulator.
Effect of core flow heat transfer enhancement on power generation characteristics of thermoelectric generators with different performances
Authors: Li Yanzhe , Wang Shixue , Fu Yunchi , Zhao Yulong , Yue Like
Published: May 2021

In this study, the effect of enhancing the core flow heat transfer with metal
foam on the performance of thermoelectric generators with different power
generation characteristics is studied experimentally. Filling the core flow
area of the gas channel in a thermoelectric generator with metal foam can
greatly improve the heat transfer capacity of the gas channel with a small
pressure loss, thereby improving the power generation efficiency. The
results show that, first, the heat transfer enhancement achieved by
partially filling the core area of the gas channel with metal foam can
significantly improve the performance of thermoelectric generators, the
maximum output power is about 1.5 times higher than that of the unfilled
channel. Second, for a thermoelectric generator with different modules, the
friction coefficient for different filling ratios increases by about 16
times at most, while the Nu value increases by only three times at most, and
according to the PEC of the gas channel, metal foam with high filling rate
and low pore density is more suitable for the thermoelectric generator.
Third, it is more appropriate to use the thermoelectric module with a high
figure of merit as the selection criterion for deciding whether to adopt the
technique of enhancing heat exchange through the gas channel. The maximum
output power and efficiency of the thermoelectric generator using the high
figure of merit module are 300% and 160% higher than those of the
thermoelectric generator using the low figure of merit module, respectively.
PENINGKATAN KINERJA GURU PKN DALAM MELAKSANAKAN PEMBELAJARAN PADA SISWA KELAS XI MIPA 2 SEMESTER GANJIL SMA NEGERI 2 MENDOYO NEGARA MELALUI PEMBINAAN SUPERVISI AKADEMIK
Authors: Winata I Komang
Published: May 2021

Penelitian ini bertujuan untuk meningkatkan kinerja Guru PKN dalam melaksanakan pembelajaran serta mampu meningkatkan hasil belajar siswa kelas XI MIPA 2 SMA Negeri 2 Mendoyo pada tingkat yang lebih baik dari siklus ke siklus, melalui pembinaan dengan menerapkan supervisi akademik. Penelitian ini dilakukan dengan menggunakan tindakan (action research) atau siklus sebanyak dua putaran atau dua siklus. Setiap putaran atau siklus terdiri dari empat tahap yaitu: 1) Rancangan, 2) Pelaksanaan Kegiatan, 3) Observasi, dan 4) Refleksi/ Tindakan. Metode pengumpulan data yang digunakan pada penelitian ini yaitu: observasi, tes dokumentasi dan wawancara. Hasil yang dicapai dalam Penelitian ini adalah: 1) Peningkatan kinerja guru PKN siklus I dengan nilai rata-rata = 6, 2) Peningkatan kinerja guru PKN siklus II dengan nilai rata-rata = 7,2, 3) Peningkatan hasil belajar siswa siklus I dengan nilai rata-rata = 74, dan 4) Peningkatan hasil belajar siswa siklus II dengan nilai rata-rata = 79. Kesimpulan dari Penelitian Tidakan Sekolah ini adalah penerapan supervisi akademik sebagai wahana pembinaan bagi guru PKN dapat meningkatkan kinerja Guru PKN dalam melaksanakan pembelajaran, serta berdampak terhadap peningkatan hasil belajar siswa kelas XI, MIPA.2 Semester Ganjil tahun pelajaran 2019/2020 SMA Negeri 2 Mendoyo secara signifikan.
PENERAPAN MODEL PEMBELAJARAN DISCOVERY LEARNING DALAM UPAYA MENINGKATKAN HASIL BELAJAR MATA PELAJARAN SEJARAH MATERI PERISTIWA SUMPAH PEMUDA BAGI SISWA KELAS X SEMESTER GENAP PROGRAM KEAHLIAN KECANTIKAN KULIT DAN RAMBUT SMK NEGERI 27 JAKARTA TAHUN PELAJARAN 2018/2019
Authors: Hutajulu Tapitta
Published: May 2021

Penelitian ini dilaksanakan di SMK Negeri 27 Jakarta pada kelas X Semester Genap Program Keahlian TKKR dan bertujuan untuk meningkatgkan hasil belajar siswa agar dapat mencapai nialai rata-rata standar yang telah ditetapkan sekolah. Penelitian ini merupakan penelitian tindakan kelas yang dilaksanakan dalam dua siklus. Setiap siklus terdiri dari 2 kali pertemuan yang di dalamnya terdiri atas perencanaan, pelaksanaan tindakan, observasi, dan refleksi. Data hasil belajar siswa dikumpulkan melalui lembar observasi aktivitas belajar siswa dan penilaian aspek pengetahuan siswa menggunakan tes. Data yang telah dikumpulkan tersebut dianalisis dengan menggunakan analisis deskriptif. Hasil penelitian ini menunjukkan bahwa penerapan Model Pembelajaran Discovery Learning dalam pembelajaran sejarah dapat meningkatkan hasil belajar siswa. Adapun hasil yang dicapai dalam Penelitian Tindakan Kelas ini adalah : 1). Pada aspek sikap pada siklus 1 semua siswa sudah mencapai kategori baik sedangkan pada siklus 2, kategori amat baik diraih oleh 22 siswa dan kategori baik dicapai oleh 12 siswa. Jadi aspek sikap sudah mencapai tuntas pada siklus 1. 2) Aspek pengetahuan, pada siklus 1 mencapai ketuntasan 97% dengan nilai rata-rata 81 Sedangkan pada siklus 2 baru mencapai ketuntasan 100% dengan nilai rata-rata 85. Dan 3) Aspek keterampilan, pada siklus 1 mencapai ketuntasan 97% dengan nilai rata-rata 77. Sedangkan pada siklus 2 telah mencapai ketuntasan 100% dengan nilai rata-rata 82. Berdasarkan data penelitian dan pembahasan dapat diambil kesimpulan bahwa penerapan model Pembelajaran Discovery Learning dapat meningkatkan hasil belajar siswa kelas X. Program Keahlian TKKR SMK Negeri 27 Jakarta dengan baik.
An exploration of the awareness of hygienic swimming behaviours and an evaluation of a public health intervention, to reduce the transmission of cryptosporidium
Authors:   , Jones Hannah M
Published: May 2021

Background: Educating swimming pool users about hygienic swimming behaviours, such as not swimming whilst suffering from diarrhoea and vomiting, is key to reducing the transmission of cryptosporidium, which is an infectious disease. There is limited literature focusing on hygienic swimming behaviours. Aim: To explore awareness of hygienic swimming behaviours and to develop and evaluate a public health intervention to reduce the transmission of cryptosporidium. Methods: A study was conducted using a exploratory sequential design, involving semi-structured interviews with 28 stakeholders (e.g. swimmers, pool operators). These findings informed the development of a questionnaire completed by 407 swimmers/parents of swimmers. These studies explored awareness and ways to raise awareness of hygienic swimming behaviours. The findings informed the development of a poster to raise awareness of such behaviours, and a small-scale evaluation was conducted with 153 respondents. Findings and discussion: Many factors were identified which influenced hygienic swimming behaviours, including current awareness, cultural factors and the design of swimming facilities. Respondents identified a variety of methods for raising awareness, of hygienic swimming behaviours with a poster in the changing rooms being the most preferred method. Positive feedback was provided about the poster, which was perceived as being easy to read and informative. Of note, respondents also reported that the poster had encouraged them to consider their own hygienic swimming behaviours. Implications and recommendations: A resource has been created as part of this study, and it is hoped that it will be used by swimming facilities across Wales, and potentially further, to encourage people to swim, and to do so hygienically. The poster developed has raised awareness of hygienic swimming behaviours and received positive feedback in terms of evaluation from swimmers/parents of swimmers and endorsement from Public Health Wales. Permission to include the Public Health Wales logo on the poster demonstrates the value and importance of the message, especially as currently there is no legal requirements for swimming pools to display such information.
Synthesis, Characterization and Antimicrobial Evaluation of some 1,2,4-Triazolo-5-Thione Derivatives
Authors:   School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab., Singh Gurdeep , Jain Neetesh K. ,   Oriental College of Pharmacy and Research, Oriental University, Indore (M.P.), Sahu Kiran ,   Oriental College of Pharmacy and Research, Oriental University, Indore (M.P.)
Published: May 2021

Due to this increasing predicament of antibiotic confrontation, the lot of distinct antibiotics available is dwindling and there are only smatterings of new antibiotics in the drug development channel. Therefore, an intense necessitate for new antimicrobial drugs. In current study, substituted 1,2,4-triazolo-5-thione derivatives were synthesized from substituted aromatic aldehydes, succinic acids and the structure of synthesized compounds were established by physicochemical (Melting Point, Rf value) and spectral analysis (IR, NMR & Mass). The title compounds were then evaluated for their antimicrobial activity against ciprofloxacin as a standard drug using agar plate method. Among all synthesized derivatives A5 and A6 found were found to possess very promising antimicrobial activity. Keywords: 1,2,4-triazolo-5-thione, anti-microbial, antibiotic, thione, Ciprofloxacin.
Turkish Language and Turkish Culture Education in Flanders, Belgium: A model proposal
Authors: KARATAS ACER Ebru , ALTINKAMIŞ Feyza
Published: May 2021

In this paper, "Turkish language and Turkish culture classes" in Belgium are chronologically presented from past to present and through the facing challenges and problems, a case study was conducted. Furthermore, an integrated model is presented to address the problem of suspended and ill-structured Turkish classes in the Flemish region.
After 30 June 2016, ‘Turkish-language and Turkish-culture classes’ have been suspended in the Flemish region of Belgium, a federal state composed of communities (Flemish, French and German-language) and regions (Flemish, Walloon and Brussels Capital), which makes it problematical for the Turkish community to keep their language and culture alive through classes. Since 2016, some local NGOs have been able to organise ‘Turkish-language and Turkish-culture classes’ in the Flemish region through programmes funded by the Presidency for Turks Abroad and Related Communities in Turkey. While this appears to be a short-term solution to the problem of suspended Turkish classes at schools, a new model should be drafted in order to adopt an institutionalised and longitudinal school-based approach as a long-term solution.
For an effective Turkish language and Turkish culture teaching and learning process, some important and sustainable measures should be taken into account. A negligence suspension after 2016 has affected Turkish-language and Turkish-culture teaching and learning processes, heralding a period of regression. Pursuant to a Protocol signed by the Flemish Government and Turkish Governments, the "Turkish-language and Turkish-culture classes" were resumed over in Flanders in the 2019-2020 academic year, with a model-based approach presented in this study. This educational model came about thanks to a theme-based, multilingual approach, which is integrated successfully in Flemish schools by bilingual local teachers living in Flanders.
Introducción al dossier: Literaturas, memorias, testimonios
Authors: Rodríguez Samanta , Tavernini Emiliano
Published: May 2021

El presente dossier vuelve a la pregunta por los vínculos entre la literatura contemporánea y las configuraciones emergentes de la memoria social, histórica y política sobre el pasado reciente latinoamericano. Nos proponemos explorar diversos modos en que la literatura y la escritura –literaria y académica– releen tradiciones para dar lugar a los trabajos y rituales de la memoria, y también para reivindicar su agencia en la transformación de los estatutos del testimonio. ¿Cómo pensar hoy la literatura y el arte en tanto territorios de memorias no fosilizadas? ¿Cuáles son los corpus narrativos y poéticos que emergen mediante lecturas que incorporan la perspectiva de género o el paradigma de las teorías de los afectos? ¿Cuáles son lxs cuerpxs invisibilizadxs y violentadxs por la racionalidad del estado patriarcal y las lenguas que vienen a desarmarlo? ¿Qué le dicen hoy la literatura y las nuevas formas del testimonio a ese orden cultural? ¿Qué valor cobra lo poético en la revelación de los mecanismos del recuerdo y de la memoria?
Profesores de Historia y problemáticas de la historia reciente a partir del caso local de Merlo: concepciones, prácticas e institución escolar
Authors: Rossi Ignacio
Published: May 2021

El presente trabajo es un estudio sobre la enseñanza de la historia reciente (HR) que parte del testimonio de un conjunto de profesores de Historia de la localidad de Merlo, Buenos Aires. En las entrevistas, se buscó indagar en las concepciones que tienen los profesores sobre la HR, su enseñanza en las aulas y las conmemoraciones en las escuelas. De esta forma, en una primera parte se analiza el interés por la HR y cómo esta es concebida por los profesores. En la segunda, el examen se centra en las formas de generar interés en los alumnos y los resultados que ello produce en las prácticas educativas. El último apartado corre el eje al espacio escolar en el que se desempeñan los docentes y cómo estos viven, desde su óptica, el desarrollo de las conmemoraciones y sus actividades en torno a la HR. Se ha podido constatar que los profesores comparten una narrativa política que involucra una forma de entender la HR como una herramienta de lucha para el presente y que esta podría tener características originales desarrolladas en torno al contexto sociopolítico de los entrevistados.
Pasado y presente en la resistencia de los pueblos originarios de Norteamerica
Authors: Bozza Juan Alberto
Published: May 2021

Este artículo analiza la vinculación entre la acción colectiva de las naciones originarias de Norteamérica y la revisión crítica del pasado americano. Describe el enfoque estigmatizador proyectado por la historiografía decimonónica hasta bien avanzado el siglo XX. Considera al movimiento por los derechos civiles de los años sesenta como la etapa matricial de la conciencia  histórica india. Destaca el rol de las organizaciones militantes nativas que, fundadas en una visión alternativa y crítica del pasado, llevaron a cabo un conjunto de iniciativas encaminadas a la emancipación y autogobierno de los pueblos ancestrales. Estas acciones fueron decisivas para la construcción de una memoria de la resistencia de los pueblos nativos de Norteamérica.
Custodio de la doctrina y represor estatal. La función del teniente coronel Osinde dentro del movimiento peronista, 1953-1973
Authors: Bartolucci Mónica
Published: May 2021

En este trabajo se revisa la relación del teniente coronel Jorge Manuel Osinde con Juan Domingo Perón atendiendo al rol que cumplió como agente de control estatal y represor en el primer período peronista y luego como custodio del movimiento, desde el exilio a la vuelta al poder del ex presidente. A partir de ello intentamos repensar acerca de las continuidades de prácticas represivas estatales o paraestatales en gobiernos incluso democráticos, en la segunda mitad del siglo XX. Sobre todo, se intenta percibir la transformación que el concepto de enemigo político asumió dentro del movimiento peronista, mientras que este se ampliaba ideológicamente hacia una izquierda revolucionaria o una izquierda nacional. Se observa cómo desde la perspectiva de uno de los cuadros más leales al peronismo como Osinde, el enemigo sospechoso será perseguido primero por un antiperonismo caracterizado difusamente como propio de “agentes comunistas” (aun cuando se tratara de radicales, socialistas, o incluso comunistas) y más tarde por infiltrados o agentes externos/extraños al movimiento. El caso de Osinde, a nuestro juicio, aporta a la comprensión de la marcialidad, es decir la imbricación entre conductas militares, prácticas policiales y lealtades políticas, como una de las características sobresalientes del conglomerado de la ortodoxia peronista, a posteriori identificado como “derecha peronista” por los historiadores.
Acerca de imagen de tapa
Authors: Aletheia Equipo Editorial
Published: May 2021

Reseña de la imagen del número.
Violencia política y género: Estudio de la militancia de mujeres comunistas durante el periodo de la Política de Rebelión Popular de Masas (1980-1990)
Authors: Robles Recabarren Javiera
Published: May 2021

Revisión de Tesis Violencia política y género: Estudio de la militancia de mujeres comunistas durante el periodo de la Política de Rebelión Popular de Masas (1980-1990)
De-generar la formación docente en Educación Física
Authors: Bazán Eugenia , Bilo Mayra , Brandán Tatiana , Castro Franco , Gravano Ornella , Mármol Nicolas , Labaké Leticia , Rexach Patricia , Ciccone Santiago , Vieytes Manuel
Published: May 2021

El presente artículo se enmarca en el proyecto de investigación “La buena enseñanza. Intervenciones docentes y evaluación en clave de géneros. Estudio en los Profesorados Universitarios de Educación Física de la UNLu y UdelaR”, de la Universidad Nacional de Luján, Argentina. El propósito es compartir un taller vivencial llevado a cabo en el “II Encuentro de Estudios en Deporte” de la Universidad de la República, Uruguay (UdelaR). Dicha instancia surge como necesidad de generar un espacio práctico de problematización e indagación sobre la educación física y su enseñanza con perspectiva de géneros en la trayectoria de la formación docente, con el objeto que los y las participantes practiquen, apropien y transfieran la perspectiva de géneros al desarrollo de sus prácticas docentes.
El papel transformador de las mujeres líderes en la lucha contra la corrupción en Uganda
Authors:   Profesor de relacionales internacionales, Facultad de Derecho, Universidad de Navarra (España), Sempijja Norman , Žebrauskaitė Emilija ,   Estudiante de Relaciones Internacionales y miembro del centro de investigación de Asuntos Globales y Estudios Estratégicos, Universidad de Navarra (España)
Published: May 2021

Las mujeres ugandesas han conseguido emanciparse y alcanzar puestos clave de poder en el sector público. Sin embargo, aún pugnan por ejercer una influencia decisiva en la lucha contra la corrupción. La presente investigación, de metodología mixta, analiza las causas principales de la corrupción y el efecto que esta tiene sobre el papel de las mujeres en su lucha contra dicha lacra. Se concluye que las mujeres que están en el poder en Uganda, aunque consiguen mayor transparencia, se han visto sobrepasadas por la percepción colectiva de que quienes ostentan el poder se ven involucrados en prácticas de corrupción y por la necesidad de supervivencia política en un sistema político patrimonial. No obstante, cuando se les ha otorgado espacio y agencia, han sido transformadoras, como fue el caso de la lucha contra el VIH y los cambios que inspiró Allen Kagina desde la Autoridad Fiscal y la Autoridad Nacional de Carreteras de Uganda.
Participación política de las mujeres: una mirada desde el lenguaje y el género
Authors:   Candidata a doctora en Estudios Interdisciplinares de Género y Políticas de Igualdad.Universidad de Salamanca, Rátiva Martínez Nathali
Published: May 2021

Reseña de libro: Shaw, Sylvia. Women, Language and Politics. Cambridge University Press, 2020. 342 págs
Mídia e poder
Authors: Holowate Isaias
Published: May 2021

A mídia constrói uma realidade ao mesmo tempo em que é construída pela sociedade ao qual faz parte. Nas páginas dos jornais interesses políticos, ideológicos e intelectuais são colocados em disputa, o que após jogos de poder instituídos dentro da configuração do jornal, emergem os projetos políticos do jornal. Este artigo estuda a fundação do jornal O Progresso em Ponta Grossa no Paraná e o projeto ideológico do jornal, analisando as disputas discursivas da publicação em relação as estratégias de poder e de discurso nas páginas do periódico e na configuração social.
Palavras-Chave: Cultura da Mídia. O Progresso. Ponta Grossa.
Desenvolvimento biopsicossocial de adultos com Mielomeningocele
Authors: Borges Beatriz Essenfelder , Kovalhuk Mayara da Silva
Published: May 2021

A Mielomeningocele é uma doença decorrente da malformação do tubo neural nas primeiras semanas de gestação. Não possui cura, porém são proporcionados tratamentos ao longo do desenvolvimento para evitar complicações irreversíveis. Objetivo: Mostrar a atual qualidade de vida dos portadores de mielomeningocele e os obstáculos ao longo do seu desenvolvimento. Método: Trata-se de uma pesquisa descritiva exploratória de natureza qualitativa, com cinco indivíduos com sequelas da Mielomeningocele maiores de 18 anos, que foram entrevistados. Resultado: A análise dos dados coletados foi realizada com o apoio da literatura pré-existente, os resultados permitiram compreender o impacto diário desta malformação no desenvolvimento e as dificuldades enfrentadas ao longo dos anos. Conclusão: A partir dos relatos coletados foi possível compreender as limitações desenvolvidas diante das sequelas secundárias, assim como a superação e adaptação dos indivíduos com mielomeningocele ao longo do seu desenvolvimento.
Palavras-chave: Mielomeningocele. Qualidade de vida. Perfil de impacto.
Test and Re-Test Reliability of the Special Judo Fitness Test
Authors: Štefanovský Miloš , Poliak Matej , Augustovičová Dušana , Kraček Stanislav , Hadža Radovan
Published: May 2021

Background. When analyzing the available literature, we found differences and considerable variability in the Special Judo Fitness Test (SJFT) reliability methods.

Problems and Aim. For this reason, we have set our goal to determine the reliability and measurement error of all parameters by SJFT.

Methods. The research sample consisted of 15 judo athletes (17.13 ± 1.96 years, body height 174.4 ± 10.64 cm, body weight 72 ± 15.37 kg) who trained in judo on average 8.73 ± 2.12 years in two different Slovak judo clubs. The results were processed using interclass correlation analysis and measurement error percentage.

Results. Our results indicate poor reliability for HR0 (α= 0.374, Err = 4.2 %) and moderate reliability for the following parameters: the number of throws in section A (α = 0.641, Err = 5.9 %), section B (α = 0.512, Err = 6.0 %), and section C (α = 0.644, Err = 5.9 %), respectively. Moderate reliability was also found for the total number of throws (α = 0.687, Err = 5.1 %). Good reliability was found for HR1
(α = 0797, Err = 3.5 %) and SJFT index (α = 0.807, Err = 4.5 %).

Conclusions. According to the results of this study, by testing the special level of judo fitness, as well as its changes, we recommend using the HR1 and SJFT index as good reliable parameters.
Research of urban waterfront space planning and design based on children-friendly idea
Authors: Jiao Hong , Liu Zehua
Published: May 2021

The natural environment is vital for the healthy growth of children. The absence of exposure to Nature in cities is an important cause of physical and psychological health problems in children. With the objective of a healthy growth environment for children, this paper states the active role of the urban waterfront space, analyses the relationship between children and urban waterfront space, summarises the characteristics of children’s outdoor activities, proposes the principle and methods of planning and designing a children-friendly urban waterfront space, and provides some improved design strategies.
Experimental Work to Study the Strengthening Effect of SFR and CFRP on a Part or Whole of the Length of Slender RC Columns
Authors: Al-Helfi Mohammed , Allami Ali
Published: May 2021

This paper is focussed on the investigation of the strengthened column by steel-fibre-reinforced (SFR) and carbon fibre-reinforced polymer (CFRP) on a part or a whole of the length of the column under axial force, and to obtain the effective length, which is responsible for the increasing of the ability of the column to resist buckling. Seven samples were designed as slender reinforced columns with dimensions of 2000 mm length and cross-sections of 120 mm x 60 mm. It was shown that the strengthening of the middle half of the column length by SFR gave an ultimate load similar to the strengthening of the whole column with same material. Also, it was found that the column strengthened by SFR increased its ultimate load by 42.6 %, 42.1 % and 33.3 % for strengthened lengths of dimensions L, L/2 and L/3, respectively, compared to the non-strengthened column. The increase in ultimate load that could be borne by the column strengthened by CFRP were 53.0 % and 33.8 % for strengthened lengths of L and L/2, respectively, only. Interaction diagram had been depended as a theoretical analysis for slender concrete columns. The interaction diagram for the column strengthened by CFRP is greater than for the column strengthened by SFR, which in turn is greater than the non-strengthened column.
Determination of Axial Capacity for Enhanced Normal and Ultra - High Performance Concrete Columns
Authors: Abdulqader Sarmad Shafeeq , Ahmed Asmaa Ali , Ahmed Nawfal Shihab
Published: May 2021

Concrete Technology has been developing for more than a century. One of the most exceptional achievements in concrete technology is the evolving of Ultra-High Performance Concrete (UHPC) which has been a research focus in a wide applications diversity. In this paper, an experimental work has been carried out for investigating the transverse and longitudinal reinforcements’ variation influence on the axial capacity of UHPC columns. Eight columns (five UHPC columns and three Normal Strength Concrete (NSC) columns) have been poured and tested under a concentric axial compression load till a failure is reached. Then, the results are reported herein. The experimental results show that UHPC columns failed in a controlled manner and no concrete chips or a concrete cover spalling are observed. Also, the longitudinal reinforcements have not buckled away beyond the peak load because of the presence of the reinforcing steel fibers in UHPC. Correspondingly, the steel ties spacing proportionally affects the load carrying capacity of columns as presented hereinafter.
Measuring the Influence of Communication Planning Towards Construction Project Performance
Authors: Setiawan Andre Feliks , Hansen Seng , Fujiono Antonius
Published: May 2021

Effective communication is necessary for the success of construction project performance. Due to its nature, effective communication is required to coordinate all parties involved in construction projects such as owners, project managers, engineers, subcontractors, etc. Few previous studies have addressed the issues of construction project communication, particularly in the communication planning stage. This paper aimed to investigate how far the communication planning has been effectively implemented in several construction projects in Jakarta and measure how big the influence to project performance. It adopts a quantitative method by distributing questionnaire surveys to contractors and consultants in Jakarta. Descriptive statistics were used to analyse the data which presents that communication planning has been implemented by 78.02 % of the responses and significantly impact the project performances. This paper offers useful implications for practitioners on how construction project teams (from contractors and consultants) should carefully manage the communication process particularly during its planning stage.
Experimental Tests of Fiber-Reinforced Concrete Slabs and Comparison of Deformations Using 3D Graphs
Authors: Čajka Radim , Marcalíková Zuzana
Published: May 2021

The presented article deals with experimental testing of fiber-reinforced concrete slabs using a specialized testing device, the so-called Stand. The experimental testing involved a total of three slabs with different fiber dosing. Dosing was chosen of 25, 50, and 75 kg/m3. In the case of fiber dosing of 75 kg/m3, the concrete recipe was changed with regard of fiber dosing. The test equipment allows vertical loading of the elements and, together with the installed track sensors and computer technology, records the vertical deformations. The deformation of the slabs was evaluated using 2D deformation sections in the slabs of mounted sensors and using 3D deformation sections with the use of interpolation of intermediate values. The article is supplemented by a test evaluation of the mechanical properties. These were concrete compressive strength, modulus of elasticity, and tensile strength. The mechanical properties were also tested and evaluated for plain concrete (dosage 0 kg/m3). By evaluating the mechanical properties and deformations, it is possible to observe differences in the behavior of fiber-reinforced concrete elements for different degrees of fiber reinforcement. The article evaluates the positive effect of fibers on the load capacity and the deformations of slabs.
Investigation of Compressive Strength of Straw Reinforced Unfired Clay Bricks For Sustainable Building Construction
Authors: Dawood Abbas O. , Mussa Faten I. , Khazraji Hayder Al , Ulsada Hussain A. Abd , Yasser Mohammed M.
Published: May 2021

The mud is considered as one of the oldest construction materials in Iraq and is still used in the country regions for farmer’s houses or animal shelters. In Iraq, there are different types of mud constructions, including adobe, unfired bricks and cob. The presented study has focused on unfired clay brick where the clay is the main material. To ensure that the clay is pure and clean, it was excavated from the depth of 2 m below the natural ground level. Different types of unfired clay bricks produced by adding different materials to the clay to improve its properties and especially large deformation due to shrinkage. The added materials are classified into three concepts, the first additives are the natural fibers (straw, sawdust, and rice husk) and they are used to improve the tensile strength of brick and reduce the cracking due to shrinkage. The second additives included added the fine and coarse sand as a stabilizer to reduce the volumetric changes. The third additives are adding cement to increase the adhesive and cohesion of the mud matrix. The measurements included compressive strength of brick, mortar, and masonry and the flexural strength of bricks alone. The behaviour of unfired masonry prisms was also compared to the traditionally fired clay brick prisms. The results indicate that higher compressive strength of bricks was got for the mix that included clay, coarse sand and straw. The maximum flexural strength of bricks was got for the mix that included clay and sawdust, while for unfired masonry prism the higher compressive strength was obtained with a mix that included clay, coarse sand and straw. Finally, a proposed formula to obtain the compressive strength of unfired brick masonry from the compressive strength of brick and mortar is presented.
Analysis of Prestressing in Precast Prestressed Concrete Beams
Authors: Kraľovanec Jakub , Moravčík Martin , Jošt Jozef
Published: May 2021

Knowledge of prestressing force’s value is in the case of prestressed concrete structure the most important basis for defining load-carrying capacity and remaining service life. Numbers of prestressed concrete structures are about to reach their limit of service life and they are exhibiting signs of deterioration due to the conceptional errors, inadequate maintenance and environmental distress. All of these factors negatively influence the actual state of prestressing. Thus, it is essential to determine the value of prestressing force considering the degradation of materials, such as corrosion of prestressing strands or wires. While assessing structure in service, it is difficult to apply magnetoelastic sensors or use other direct methods for determining the state of prestressing. Hence, the indirect methods enable to analytically calculate the prestressing force based on the results of measurement, e.g. strain, stress, deflection, or width of the crack. The present paper focuses on numerical analysis of prestressing in a twosome of precast prestressed concrete beams. For the numerical analysis, two indirect methods are applied, specifically Saw-cut method and Crack initiation method. Finally, the results are discussed and recommendations for the experimental campaign are summarized.
Analysis of Slope Stability
Authors: Harabinová Slávka , Kotrasová Kamila , Kormaníková Eva , Hegedüsová Iveta
Published: May 2021

In the paper the numerical modelling of ensuring slope stability and their analysing with using of different numerical methods are presented. We have designed the cutting walls with earth nails and anchors securing for modelling of slope stability ensuring. The calculate and the mechanism of failure process of the reinforced slopes were studied using the different methods for slope stability. The nailing significantly increased the stability level for using Spencer method. The anchors increased the stability level for using Spencer method. Increasing the nail or anchors length improved the stability of the reinforced slopes. The reinforced slope exhibited a significant the stability level.
Temperature Conditioned Resonance Clusters in Bridges Subjected to Moving Loads
Authors: Tesar Alexander , Melcer Jozef
Published: May 2021

The objective of this study is the analysis of temperature conditioned resonance clusters appearing in scope of dynamic testings of bridges by moving loads. As example is studied the assessment of actual bridge exposed to such forcing. Presented are the results and final conclusions dealing with security and reliability of the structure.
Heuristic comparative assessment of non-conventional warehouse designs
Authors: Esmero Antonio T. , Branzuela Queenie Rose S. , Paypa Jessilyn T. , Rojo Sharmaine Myka S. , Sacay Eduardo S. , Selerio Egberto F. , Ocampo Lanndon A.
Published: May 2021

In the unit-load warehouse (UW) design, the aisle design problem dealing with storage space layout is the first among the three main problems. Several conventional and non-conventional designs have been proposed in the literature. In general, the assessment of UW designs is commonly carried out using analytical approaches. However, such an approach may be inadequate due to assumptions or approximations, making results unrealistic. Aiming to bridge this gap, this research develops an assessment framework that employs the FlexSim software for simulating the conventional, Flying-V and Fishbone designs based on a real case from a Philippine manufacturing company. Using a computer simulation, this research investigates factors not yet tractable with present analytical methods. The factors employed for the comparative assessment are “picking run-time”, “travel distance”, and “capacity”. The results suggest that the Fishbone design provides the most advantage compared to the Flying-V and other conventional designs. With the proposed Fishbone design, the company is expected to save, on average, 52.39% of picking run-time, 32.25% travel distance, and increase storage capacity by 7.5%. The research findings are compared to previous studies based on analytical approaches.
Comparing bottom-up and top-down ratings for individual soccer players
Authors: Hvattum Lars Magnus , Gelade Garry A.
Published: May 2021

Correctly assessing the contributions of an individual player in a team sport is challenging. However, an ability to better evaluate each player can translate into improved team performance, through better recruitment or team selection decisions. Two main ideas have emerged for using data to evaluate players: Top-down ratings observe the performance of the team as a whole and then distribute credit for this performance onto the players involved. Bottom-up ratings assign a value to each action performed, and then evaluate a player based on the sum of values for actions performed by that player. This paper compares a variant of plus-minus ratings, which is a top-down rating, and a bottom-up rating based on valuing actions by estimating probabilities. The reliability of ratings is measured by whether similar ratings are produced when using different data sets, while the validity of ratings is evaluated through the quality of match outcome forecasts generated when the ratings are used as predictor variables. The results indicate that the plus-minus ratings perform better than the bottom-up ratings with respect to the reliability and validity measures chosen and that plus-minus ratings have certain advantages that may be difficult to replicate in bottom-up ratings.
Exploring the Overrepresentation of Black Male Students in Special Education: Causes and Recommendations
Authors: Delahunty Michael , Chiu Calli Lewis
Published: May 2021

An overrepresentation of Black male students identified as having disabilities is pervasive in American schools. This troubling reality may be the result of disconnects between Black males and their White teachers. Racial differences likely contribute to the high number of Black males referred for programs for students with disabilities. This paper explores the overrepresentation of Black male students identified as having disabilities and recommendations for supporting their success.
Gender, Productive Resources and Agricultural Development in the Urban Area
Authors: Olufemi Damilola Blessing , Adejumo Olusola Joseph
Published: May 2021

The Nigerian society is a patriarchy society where men dominate over women most especially in access and control over productive resources and decision-making process. This limitation often has negative impacts on food security; most especially in urban areas where more than half of the world’s population now dwells. This study aimed at documenting the experiences of urban women farmers in accessing critical agricultural productive resources. The study engaged both quantitative and qualitative methods in designing the research. Multistage sampling technique was used to select 250 respondents, and information was elicited through the use of questionnaire, Key Informant Interview (KII), and Focus Group Discussion (FGD). The study revealed that the urban female farmers in the study area have inadequate access to critical agricultural productive resources and are still making use of crude and traditional implements in their various agricultural activities. Likewise, through usufructuary rights, in reference to access to land the urban status quo is gradually weakening the patriarchal nature of the society.
Inherited Thrombophilias in Thrombosis Advancement in Microvascular Flap Surgery
Authors: Ozoliņa Agnese , Vanags Indulis , Drizlionoka Karina , Ņikitina-Zaķe Liene , Mamaja Biruta
Published: May 2021

Microvascular flap surgery is a reliable method for reconstructive surgery. To avoid and foresee free flap thrombosis advancement after microvascular flap surgery, patient assessment, flawless surgical technique, and eligible perioperative care are pivotal. In this prospective observational study, we aimed to elucidate the most common inherited single nucleotide polymorphisms (SNPs) attributable to free flap thrombosis. A total of 152 patients undergoing microvascular flap surgery during the study period of 2016–2019 were analysed for five SNPs: rs6025 in Factor V Leiden (FVL) gene, rs1799963 in Factor II (FII) gene, rs2066865 in Fibrinogen Gamma Chain gene (FGG), rs2227589 in SERPINC 1 gene and rs1801133 in Methylene Tetrahydrofolate Reductase (MTHFR) gene. Activated protein C resistance (aPCR), prothrombin, antithrombin (AT), fibrinogen and homocysteine plasma levels were measured to determine association with the analysed SNPs and with free flap thrombosis advancement. Our preliminary results show that carriers of FVL mutation were associated with aPCR, as we observed significantly lower aPCR plasma levels in carriers of genotype C/T, as compared to C/C; p = 0.006 (CI 95%, 0.44 to 1.19). Additionally, mean fibrinogen plasma levels were higher in carriers of FGC gene rs2066865 genotype A/A (5.6 ± 1.81 g/l), as compared to G/A and G/G; p = 0.04 (CI 95%, 0.007 to 1.09); p = 0.004 (CI 95%, 0.48 to 2.49), respectively. The study group included 12 patients (7.9%) with free flap thrombosis. For one patient free flap thrombosis advancement might have been related to the rs6025T – FVL mutation with a PCR plasma level 1.21. Lower aPCR levels was associated with carriers of FVL rs6025 C/T and higher fibrinogen plasma levels with carriers of FGG rs2066865 A/A, suggesting that these genotypes might predict higher free flap thrombosis risk, but we found no significant association between analysed SNPs and free flap thrombosis advancement.
Wpływ populizmu na demokrację liberalną: na przykładzie prawicy (PiS i Kukiz’15) w wyborach parlamentarnych w Polsce w 2015 roku
Authors: Tyrała Marek
Published: May 2021

The main research hypothesis put in the article is: Populist parties have a negative impact on the functioning of liberal democracy in Poland. The article attempts to characterize and define the main criterion distinguishing populist parties and anti-system movements against the background of standard political parties. The article also attempts to characterize the process of functioning of liberal democracy in Poland. The text has an interdisciplinary character, the research problem has been analyzed from a political, sociological and philosophical perspective. While verifying the hypothesis put in the work, it was noticed that there is a high probability that the election success of populist parties and movements had a negative impact on the process of functioning of liberal democracy in Poland after the parliamentary elections. An attempt to verify the research hypothesis can make a significant contribution to further studying the functioning of the party and anti-system movements in the process of electoral rivalry in Poland.
Społeczne i kulturowe determinanty funkcjonowania państwa u progu XXI wieku
Authors: Strzelecki Michał
Published: May 2021

The contemporary state crisis is a derivative of complex economic and social processes. His indicators include not only the visible increase in the intensity of political conflicts (both on a micro and macro scale), the revival and development of separatist tendencies, and the weakening of the role of the state as the basic instrument of organizing collective life. It is also increasing fragmentation of the political scene, the development of particularisms, weakening and progressive dysfunctionality of existing political institutions, increasing economic rivalry and the collapse of the generally accepted axiological system, which is accompanied by increasingly clear questioning of the idea of the common good and progressing pragmatism and egoism. An important element is therefore the disappearance of civic awareness and activity. The intensification of these disturbing tendencies is certainly not supported by the modern education system, whose hallmarks are commercialization and economization, withdrawal of the state and professionalization.
Jerzy Regulski – współtwórca samorządu terytorialnego III Rzeczypospolitej
Authors: Klimek Marek
Published: May 2021

Professor Jerzy Regulski played a key role in the process of building the self-government
of the Third Polish Republic. He initiated his work on the self-government system as a part
of the “Experience and Future” seminar on the turn of the 1970s and 1980s. During the period of the Polish Peoples Republic, the implementation of the developed opinions and assumptions was not possible. However, they turned out to be extremely valuable during the period of political transformation. During the session of the Round Table, Regulski was assignet to preside the works of the opposition party as a part of the Association and Self-Government Sub-team. After the victorious for the solidarity camp elections on June 4, 1989, Regulski supervised the realisation of local government reform. The restitution of communal self-government in 1990 was followed by establishing a direct self-government body at district and voivodship level in 1999.
Fundamental Outcome Measurement: Selecting Patient Reported Outcome Instruments and Interpreting the Data they Produce
Authors: McKenna Stephen P , Heaney Alice , Langley Paul C
Published: May 2021

Over the past 40 years literally thousands of generic and disease specific patient reported outcome (PRO) instruments have been developed. While most were developed for a specific study and were never used again, there is still the question of how manufacturers and others should select a PRO instrument for a study. These studies may be clinical pivotal trials or observational tracking studies to support therapy response. Formulary committees also need to be able to interpret PRO data to make decisions about whether to accept claims for therapy response. It is possible to argue that the many different approaches to outcome measurement have resulted from the lack of agreed methodologies. However, a more likely explanation is that the authors have failed to apply the axioms of fundamental measurement when creating their measures. The result is a plethora of ordinal PRO instruments that inform little about the impact of interventions. Clinical trials rarely report PRO data. Where they do, analyses are generally restricted to (for example) changes in the experimental group’s scores. Comparisons between the treatment and placebo groups or between active groups are infrequently reported, most likely due to the failure of the instrument to show differences or changes in outcome. This is unfortunate as it means no assessment is made of the value that patients gain from the intervention. This commentary is intended to make researchers and formulary committees aware of the issues that need to be addressed when selecting PRO instruments for a study or evaluating publications and claims for therapy response. The latter is crucial as reported data influence the selection of medicines and healthcare products. In the latter case a particular concern is with PRO claims embedded in simulation models.
A methodology to predict the gas permeability parameters of tight reservoirs from nitrogen sorption isotherms and mercury porosimetry curves
Authors: Tsakiroglou Christos D. , Al Hinai Adnan , Rezaee Reza
Published: May 2021

A methodology is suggested for the explicit computation of the absolute permeability and Knudsen diffusion coefficient of tight rocks (shales) from pore structure properties. The pore space is regarded as a pore-and-throat network quantified by the statistical moments of bimodal pore and throat size distributions, pore shape factors, and pore accessibility function. With the aid of percolation theory, analytic equations are developed to express the nitrogen (N2) adsorption/desorption isotherms and mercury (Hg) intrusion curve as functions of all pertinent pore structure parameters. A multistep procedure is adopted for the successive estimation of each set of parameters by the inverse modeling of N2 adsorption–desorption isotherms, and Hg intrusion curve. With the aid of critical path analysis of percolation theory, the absolute permeability and Knudsen diffusion coefficient are computed as functions of estimated pore network properties. Application of the methodology to the datasets of several shale samples enables us to evaluate the predictability of the approach.