bluuebunny/crossref_metadata_2025 huggingface dataset:
Morpho-physiological and anatomical responses to shade avoidance are exhibited in Surinam cherry seedlings
Authors: Gil Bruna Valeria , Moura Amanda Pacheco Cardoso , Perboni Anelise Tessari , Barreira Rooslany Queiroz , Fúquene Paula Andrea Bermeo , Sant'Anna-Santos Bruno Francisco , Danner Moeses Andrigo
Published: June 2024

We aimed to evaluate the acclimation of Eugenia uniflora seedlings in response to irradiance gradient employing several morphological and photosynthetic traits. Seedlings were grown for 21 months under full sunlight (S0) and three artificial shade levels: 30% (S30), 50% (S50), and 80% (S80). Growth, biochemistry( pigments), photosynthetic, and anatomic parameters were assessed. Seedlings under S0 and S30 displayed the most significant growth, biomass accumulation, photosynthetic rate, and increased leaf thickness. S0 seedlings also had leaf anatomical traits associated with protection against total sunlight conditions, confirming irradiance tolerance. Nonetheless, the main attributes of shade acclimation in E. uniflora were revealed in S50 seedlings, where the increase in leaf area and the maintenance of gas exchange in this treatment achieved similar levels to seedlings under S0 and S30. Under S80, photosynthetic capacity, growth, and biomass accumulation were critically reduced. The plasticity index portrayed growth and photosynthetic traits as the most important variables that aid the adaptation of E. uniflora under different irradiance intensities. Conditions under S0 and S30 optimize the growth of Surinam cherry seedlings. Therefore, these conditions suit cultivating E. uniflora seedlings in nurseries and orchards. This study represents the first experimental approach to determining the optimal light intensity in E. uniflora seedlings.
Riqueza e abundância de espécies de flebotomíneos em assentamentos humanos e fragmentos florestais degradados na Amazônia Maranhense
Authors: Nascimento Janilde de Melo , Moraes Jorge Luiz Pinto , Bandeira Maria da Conceição Abreu , Azevedo James Werllen de Jesus , Rebêlo José Manuel Macário
Published: June 2024

O presente estudo analisa a variação na riqueza e abundância de flebotomíneos em assentamentos rurais, com diferentes graus de degradação florestal, na Amazônia do Estado do Maranhão. Os flebotomíneos foram capturados nos municípios de Santa Luzia (área moderadamente degradada), Senador La Rocque (muito degradada) e Governador Nunes Freire (completamente degradada), durante três noites consecutivas, uma vez por mês, de maio/2012 a abril/2014. No computo geral, foram capturados 6.810 espécimes de 35 espécies de flebotomíneos, distribuídas em 13 gêneros. O mais diversificado foi Evandromyia (9 espécies), seguido por Psathyromyia (5), Pressatia (3) e Psychodopygus (3). As espécies mais abundantes foram Nyssomyia whitmani (32,33%), Evandromyia evandroi (14,89%), Lutzomyia longipalpis (12,45%), Brumptomyia avellari (6,73%), Pintomyia damascenoi (6,59%) e Migonemyia migonei (6,46%). Em todas as áreas a riqueza de espécies foi maior nos fragmentos florestais do que nos peridomicílios rurais, exceto naquela, cujo fragmento florestal estava muito degradado. A abundância de indivíduos foi maior em todos os peridomicílios. A degradação crescente da cobertura vegetal natural vem reduzindo as florestas e a riqueza de espécies de flebotomíneos. Entretanto, os fragmentos de florestas secundárias remanescentes ainda mantêm um número considerável de espécies, as quais frequentam em maior ou menor grau os assentamentos rurais adjacentes. Esses novos ambientes oferecem aos flebotomíneos oportunidades (abrigos e fontes de alimento) necessárias para a reprodução e proliferação. Como consequência, as leishmanioses passam a mudar o seu perfil epidemiológico, incidindo nas populações humanas suscetíveis.
Effect of alkaline treatment on mechanical properties of composites between vetiver fibers and epoxy resin
Authors: Janyakunmongkol Khantichai , Nhuapeng Wim , Thamjaree Wandee
Published: June 2024

In this research, we were interested in studying whether vetiver fibers (VFs) treated with different concentrations of sodium hydroxide (NaOH) affect the mechanical properties of VF and epoxy resin (ER) composite material in a better way. As part of the experiment, VFs were treated with NaOH in various concentrations ranging from 0.5, 1, 1.5, 2, 2.5, and 3 mol/L. All of them were molded into composite material in the ratio of 10 wt% with ER. After that, they were tested for mechanical properties such as the tensile strength, impact strength, bending strength, and compressive strength to find the best mechanical properties. In addition, the surface was investigated with scanning electron microscopy (SEM) for adhesion of the VFs with ER. The results of the experiment were not as expected. We found that, increasing the concentration of vetiver treated with sodium hydroxide resulted in a decrease in the mechanical properties of the composite. The best values for impact, tensile, bending, and compressive strengths were 256.42 kJ/m2, 38.45 MPa, 43.70 MPa, and 110.27 MPa, respectively, and 0.5 mol/L is the best concentration of NaOH for mechanical strengths of the composites. Moreover, from SEM technique, it was found that the mechanical properties decreased at higher concentrations. This may be caused by damage to the VFs due to excessive NaOH corrosion and this point should be taken for further study.
Development of a small-punch-fatigue test method to evaluate fatigue strength and fatigue crack propagation
Authors: Yamazaki Yasuhiro , Yoshida Keisuke , Okada Kazuhiro , Arai Momoka , Nakahara Yosuke , Ota Yutaro
Published: June 2024

Herein, fatigue and crack propagation tests were conducted using the small-punch-fatigue (SPF) test to verify its applicability to assess fatigue strength and fatigue crack propagation behavior. During the SPF test, a fatigue crack first initiated at the specimen center and then propagated in the radial direction. In most cases, three fatigue cracks propagated from the specimen center to the radial direction in point symmetry. X-ray computed tomography revealed that the crack initiated by the SPF test had a quarter ellipse shape. Elastic finite element (FE) analysis was conducted to estimate the stress state and stress intensity factor (SIF) of the specimen, and an approximate equation was obtained as a function of the applied load. The experimental results comprising fatigue lives and crack growth rates obtained via the SPF test were compared with the conventional uniaxial test data as functions of the stress amplitude and SIF determined via elastic FE analysis, respectively. This comparison showed that the SPF test can be applied to the fatigue test and fatigue crack propagation test.
Apology strategies in Tashelhit: linguistic realization and religious influence
Authors: Aatar M’hand , Skouri Hassan , Karama Lalla Asmae
Published: June 2024

This study adopts the Cross-Cultural Speech Act Realization Patterns (CCSARP) framework to investigate the apology strategies used by L1 speakers of Tashelhit, a variety of Amazigh spoken in central Morocco. To this end, 82 university students either filled an assessment questionnaire or participated in an oral closed role-play. The findings indicated that L1 speakers of Tashelhit employed seven strategies to apologize, namely taking on responsibility, Illocutionary Force Indicating Devices (IFIDs), explanation or account, offer of repair, promise of forbearance, determinism, and self-criticism. While taking on responsibility, IFIDs, and explanation or account were used most frequently in all the role-play situations to realize apologies, the other apology strategies appeared to be situation-dependent. There was also a tendency for L1 speakers of Tashelhit to use certain religious expressions to modify their apologies. These findings yielded a number of recommendations for further research and suggestions for improving the teaching of apologies in Tashelhit.
Synergistic effect of hydroxyapatite-magnetite nanocomposites in magnetic hyperthermia for bone cancer treatment
Authors: Anwar Aneela , Sadiqa Ayesha , Intisar Azeem , Rashid Amin Ur , Razaq Tabassam , Aldossari Samar A. , Mushab Mohammed Sheikh Saleh , Park Dong Yong , Choi Dongwhi
Published: June 2024

Hydroxyapatite/magnetite (HA-Fe3O4) nanocomposite materials that have the synergistic ability to produce heat when in direct bonding with a bone through HA are regarded competent hyperthermia therapies of bone carcinoma treatment. HA-Fe3O4 nanocomposites with various magnetite concentrations (10, 20, and 30 wt%) were quickly synthesized using a novel continuous microwave-assisted flow synthesis (CMFS) process in a 5 min residence duration at the conditions of pH 11. In this process, initially, phase pure hydroxyapatite and superparamagnetic magnetite nanoparticles followed by a series of HA-Fe3O4 nanocomposites were formed, without a subsequent aging step. The obtained nano-product was physically analyzed using Brunauer-Emmett-Teller (BET) surface area analysis, transmission electron microscopy, and X-ray powder diffraction analysis. X-ray photoelectron spectroscopy was used for the chemical structure analysis of the final nanocomposite product. Zeta potential measurements were carried out to determine colloidal stability associated with the surface charge of the nanocomposites. The magnetic properties were determined using a vibrating sample magnetometer. The results indicated the high magnetization property of the obtained nanoproduct, suitable for hyperthermia application. HA-Fe3O4 nanocomposites have shown remarkable antimicrobial properties against E. coli and S. cerevisiae. Thus, the CMFS system facilitated the rapid production of HA-Fe3O4 nanocomposite particles with fine particle size.
Revolutionizing energy harvesting: A comprehensive review of thermoelectric devices
Authors: Irfan Syed , Khan Sadaf Bashir , Yang Zhiyuan
Published: June 2024

The necessity for a shift to alternative forms of energy is highlighted by both approaching consequences of climate change and limited availability of fossil fuels. While a large portion of energy required can be generated by solar and wind, a diverse, sustainable energy generation mix is still necessary to meet our energy needs. By capturing otherwise lost heat energy and turning it into valuable electrical energy, thermoelectric can play a significant part in this. Using the Seebeck effect, thermoelectric generators (TEG) have established their capability to transform thermal energy into electrical energy directly. Furthermore, because they do not include chemical compounds, they are silent in operation and can be built on various substrates, including silicon, polymers, and ceramics. Moreover, thermoelectric generators have a long operational lifetime, are position independent, and may be integrated into bulky, flexible devices. However, the low conversion efficiency of TEG has confined their broad application, hampering them to an academic subject. Until now, recent developments in thermoelectric generators and devices are presuming the technology to catch its place among state-of-the-art energy conversion systems. This review presents the commonly used methods for producing thermoelectric modules (TEMs) and the materials currently studied for TEMs in bulk and printed thermoelectric devices.
Synthesis, characterization and efficient photo-catalytic performance of methylene blue by Zn doped SnO2 nanoparticles
Authors: Kaleeswaran B. , Vinodhkumar G. , Shanmugavadivu Ra.
Published: June 2024

In this manuscript, we present a facile and friendly sol-gel method to prepare bare and Zn-doped SnO2 nanoparticles and measured the photocatalytic performance of the materials by measuring the degradation of MB dye under UV light irradiation. A variety of analytical techniques were employed to characterize the materials, including X-ray diffraction, UV–Vis spectroscopy, Photoluminescence (PL), Fourier Transform Infrared Spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM). The X-ray diffraction (XRD) analysis reveals the presence of tetragonal SnO2 nanostructures. The average crystallite size of the bare SnO2 nanostructures was found to be 7.4 nm, but the addition of Zn dopant caused the size to increase to 10.5 nm. PL studies shows that the majority of emission energies fell within the SnO2 NPs’ band gap, indicating defects related to oxygen vacancies or Sn interstitials. The morphological analysis of SEM exhibits the various forms of SnO2 nanostructures which are densely agglomerate. The photocatalytic activity of the SZ10 NPs was found to be MB (88 %). The results showed that the Zn doped SnO2 exhibited good photocatalytic activity.
Edeb Olmaz
Authors: Aydemir Yaşar
Published: June 2024

Memduh Mehmed Paşa'nın derlediği Mecmuatü’l-eş’âr isimli mecmuada “edeb olmaz” redifi ile 18 matla beyti bir araya getirilmiştir. Şiir estetiği içerisinde maksat neyin edep olup olmadığını ortaya koymak değilse de umumun değer yargılarını yansıtması ve bir tema etrafında şekillenmesi dikkat çekici bulunmuştur.
Bugünün antolojilerine karşılık gelen şiir mecmuaları devrin popüler kültürünü yansıtır. 19. yüzyılda köklü değişimlerin yaşandığı coğrafyamızda değerler de aynı hızla değişim ve dönüşüm sürecine girmiş, eski ile yeninin uzunca bir süre mücadelesi olmuştur. Söz konusu temanın bu dönemde mecmuada yer alması da anlamlı bulunmuştur.
Çalışmamızda, "edeb olmaz" redifini kullanan veya bu içerikte söylenmiş ve mecmualara girmiş başka metinlerin olup olmadığı öne çıkan şiir mecmuaları taranarak kontrol edilmiştir. Yazıya zemin teşkil eden mecmuadaki gibi, konunun tematik olarak başka mecmualarda yer almadığı, aynı içerikte ve redifte söylenmiş beyitlerin daha çok nazire bağlamında bir araya getirildiği görülmüştür.
İlgili mecmualarda dağınık olarak bulunan benzer redif ve içerikteki beyitler de yazıda bir usul çerçevesinde değerlendirilmiştir. Edeb ve hayâ kelimelerinin anlamları ve toplum değerleriyle ilişkisine vurgu yapılmış zaman içerisindeki değişim ve dönüşümüne işaret edilmiştir. Akabinde tema, tespit edilen beyitlerde içerik, söyleyiş ve ihtiyaç çerçevesinde ele alınmıştır. Beyitlerin dil içi aktarımı yapılarak, şairlerin dikkati, beyit kurguları, verdikleri mesajlar diğer estetik unsurlarla ilişkilendirilerek ele alınmıştır.
Impact of a physical exercise program on resilience level
Authors: Andrade Dantas Karollyni Bastos , Prado Reis Francisco , Almeida Santos Marco Antônio , Peixoto Duarte Aline Geovanna , Santos Costa Luana , Gomes Ribeiro da Costa Lúcio Flávio , De Góes Lima Natália , Pinho Morais Raissa , Martin Dantas Estélio Henrique
Published: June 2024

Aging is a physiological process. In view of the changes that affect the elderly, there is a need for resilience in this context, essential for well-being. Objective: To analyze the resilience rates of the elderly, before and after the practice of physical activity. This is a quasi-experimental, quantitative, descriptive cross-sectional study, carried out with 100 elderly people. The participants completed the anamnesis and the “Wagnild and Young Resilience Scale”. There is an age group of 65 to 69 years old (37.8%), self-declared white (38.9%), user of UBS Augusto Franco (Augusto Franco) (62.2%), married (40%) , with incomplete primary education (26.7%), retired (40%), with a monthly family income of up to 2 minimum wages (57.8%), with the majority having increased levels of resilience subfacets: serenity, sense of life, self-confidence, self-sufficiency, perseverance. The data obtained indicate an increase in resilience with the practice of exercise, contributing to the improvement of health.
Sarcopenia and dinapenia in elderly individuals participating in a supervised exercise program
Authors: Dantas Estélio Henrique Martin , Andrade Dantas Karollyni Bastos , Gomes Ribeiro da Costa Lúcio Flávio , Sousa Nascimento Melo Ana Lúcia , Moreno Leon David Leandro , Santos Capela Igor , De Aquino Cavalcante Lívia Beatriz , Santana da Costa Sávio , Reis de Santana Tawann Santiago
Published: June 2024

This study assessed the effects of a supervised exercise program on the prevention of sarcopenia and dynapenia in the elderly. 90 elderly individuals ( = 67.40 ± 6.59 years) from Primary Health Care, most of whom had chronic diseases and were on medication, participated in the study. They underwent assessments of calf circumference (CC) and muscle strength (MS) before and after 16 weeks of training in four experimental groups, with two one-hour sessions per week. Additionally, sociodemographic data were collected. The results revealed significant gains in CC (∆% = 3.94, p = 0.003) and MS (∆% = 23.54, p = 0.0034) after the program. These findings highlight the effectiveness of an MS training program in preventing sarcopenia and dynapenia. It can be concluded that regular physical exercise plays a significant role in improving the health and quality of life of older individuals.
Polypharmacy, drug interactions, and iatrogenesis
Authors: Gomes Ribeiro da Costa Lúcio Flávio , Andrade Dantas Karollyni Bastos , Souza Nascimento Melo Ana Lúcia , Santana Goes Aline , Rosa Cássia Fernanda , De Assis Gabriella Lucas , Da Silva Cursino Ribeiro Maria Eduarda , Santos Lima Vitória , Martin Dantas Estélio Henrique
Published: June 2024

This study aimed to comprehensively address therapeutic challenges in medication use among the elderly. The research utilized the Medication Use Instrument within the Falls Risk Assessment Battery (BARQ) to collect and analyze data on medication consumption. Sixty-three elderly individuals (X̅ = 67.40 ± 6.62 years) participated in the research. Results revealed that 20.63% were at high risk (score > 11), 3.17% at moderate risk (score 8-10), 15.89% at elevated risk (score 5-7), and 60.31% at low risk (score 0-4) of iatrogenic effects. Notably, a 16-week personalized exercise program led to a significant reduction in medication consumption, resulting in a decrease in high-risk participants (% = -75.39). In conclusion, this research highlights polypharmacy issues and associated complications in the elderly, emphasizing the potential for iatrogenic harm. Exercise programs show promise in mitigating these risks by reducing medication dependency and promoting overall well-being.
5–8 klasių muzikos vadovėlių analizė krikščioniškųjų vertybių raiškos kontekste
Authors: Kauneckas Klaidas
Published: June 2024

By applying the method of content analysis, the article analyzes basic (grades 5–8) music textbooks by different authors. The article aims to find out how much and in what way Christian values are presented in the content of musical education. The results of the research revealed that the Christian faith, its meaning and values are most reflected in Balčytis’s series of textbooks “Muzika” (2007). Malikėnienė’s textbooks “Muzika” (2010) and “Muzikos labirintai” (2012) pay more attention to the development of students’ secularity and understanding of music.
Uso de modelos de impresión 3D en Ortopedia y Traumatología: Serie de casos
Authors: Garay Alin Ludmila , Cinalli Micaela , Fernández Lara , Inchaurregui Fermín , Ruesta Alava Julia Andrea , Arrieta Agustín , Bazán Pedro Luis
Published: June 2024

Introducción: Comprender y tratar deformidades, defectos y fracturas complejas sigue siendo un desafío en el área de la Ortopedia y Traumatología. La aplicación de modelos de impresión 3D incluye el diagnóstico, la planificación quirúrgica, la creación de guías intraoperatorias e implantes y el entrenamiento quirúrgico. Las deformidades y fracturas articulares complejas representanun reto en el tratamiento quirúrgico debido a la complejidad tridimensional. La tecnología de impresión 3D permite simular la anatomía, la reducción de trazos fracturarios, osteotomías, y la dirección y longitud de los tornillos. El objetivo de este artículo es comunicar una serie de casos en los que se implementó la impresión 3D y presentar una revisión narrativa. Se describen dos casos de fractura de acetábulo, dos de escoliosis idiopática, una fractura del pilón tibial compleja y una fractura de astrágalo en los que se crearon modelos de impresión 3D para la planificación quirúrgica que resultaron beneficiosos tanto para el paciente como para el equipo quirúrgico. Conclusiones: Con el auge de la impresión 3D en el área de la Ortopedia y Traumatología, podremos facilitar el entendimiento de fracturas y deformidades complejas y mejorar las planificaciones prequirúrgicas. El tiempo de producción del modelo puede demorarse y ser una limitación para su uso en urgencias. Aún faltan estudios para evaluar los beneficios significativos para el paciente y el equipo médico, como la reducción del tiempo operatorio, la pérdida de sangre intraoperatoria y la exposición a la radiación.
A Munkakörformálás (Job Crafting) Skála magyar változata
Authors: Gál Dóra , Csordás Georgina
Published: June 2024

Háttér és célkitűzések: A kutatásban a Munkakörformálás (Job Crafting) Skála magyar nyelvre történő adaptálása és a munkakörformálás (job crafting) konstruktumának magyar kontextusban végzett tanulmányozása került célkitűzésre. A munkakörformálás (job crafting) jóllétre gyakorolt befolyása kedvezően hathat a munkahelyi elköteleződésre, az észlelt autonómiára, a munkahelyi kimaradásra, valamint javíthatja a teljesítményt. A jelenség munkahelyi elégedettséggel való együttjárása által továbbá javulhat a szervezetek hatékonysága és eredményessége, valamint csökkenhet a munkavállalók kiégésének bekövetkezési valószínűsége. A munkakörformálás (job crafting) által megtapasztalt értelmes munka pedig mérsékelheti a munkahelyelhagyási szándékot és a depresszív tüneteket, valamint növelheti a munkahelyi elköteleződést és a rezilienciára való képességet. Habár a szakirodalom nagy része a pozitív következményeket hangsúlyozza, a jelenség negatív hatásai is ismertek. Ezek alapján a kihívást kereső munkahelyi viselkedés kontraproduktív hozzáállással párosulhat, így a munkakörformálás (job crafting) vizsgálata munkahelyi környezetben mindenképp releváns lehet. Módszer: Az online adatfelvételben 645 dolgozó személy vett részt (67,29% nő), akik életkora 18 és 65 év között mozgott. A mintát többségében szellemi munkát végző, felsőfokú végzettséggel rendelkező egyének alkották. A validitásvizsgálat a WHO Jóllét Kérdőívvel, a Munkával Való Elégedettség Kérdőívvel és a Munka Értelmessége Kérdőívvel történt. Eredmények: A vizsgálat során a Munkakörformálás (Job Crafting) Skála faktorstruktúrája megerősítő faktorelemzés által reprodukálásra került. Az érvényességi vizsgálat során a munkakörformálás (job crafting) a jólléttel, munkával való elégedettséggel és a munka értelmességével való pozitív együttjárása kimutatásra került, eredményeink alapján a kérdőív megfelelő érvényességgel és megfelelő reliabilitással alkalmazható. Következtetések: A kutatás megerősíti, hogy a munkakörformálás (job crafting) a jólléten, a munkával való elégedettségen és a munka értelmességén keresztül számos pozitív következményt hordoz magával. Feltételezhető, hogy a kérdőív ezen tényezőkön keresztül megfelelő eszközként szolgálhat a szervezetek optimális működésének elősegítésében.
Felügyelt gépi tanulási módszerek alkalmazása a pszichológiai kutatásokban
Authors: Hajdú Nándor , Szászi Barnabás , Aczél Balázs , Nagy Tamás
Published: June 2024

A pszichológiai kutatások számos területén hasznosítható a felügyelt gépi tanulás, amelynek alkalmazásával összetettebb adatok elemzése válik lehetségessé. Célunk, hogy bemutassuk a felügyelt gépi tanulás fajtáit, működését és használatát a pszichológiai kutatásokban. Áttekintjük a gépi tanulás előnyeit, valamint a túlillesztés, torzítási hiba és adatvariabilitás fogalmait, amelyek segítenek a modellválasztásban, és az eredmények robusztusságának biztosításában. Röviden bemutatjuk továbbá a legfontosabb felügyelt gépi tanulási algoritmusokat, és leírjuk a változók és adatok előkészítésének legfontosabb lépéseit. Egy példaelemzés keretében bemutatjuk, hogyan modellezhető egyetemi hallgatók lépcső és lift közötti választása felügyelt gépi tanulással. A cikk végén kitérünk a gépi tanulás korlátaira és annak helyére a pszichológusok oktatásában. Reméljük, hogy a bemutatott ismeretek segítenek a pszichológusoknak a gépi tanulás hatékonyabb és kreatívabb használatában.
“It Just Takes so Much Time!” A Study of Teachers’ Use of ICT to Convey Relevance of Mathematical Content
Authors: Prieto-Rodriguez Elena
Published: June 2024

This paper reports on a component of a study which aims to determine how ICT, and in particular some of the technology funded as part of Australian government’s DER (Digital Education Revolution) program, is used by teachers in the state of New South Wales. The study looks
in particular at whether technology is used to incorporate real-world relevance into mathematics lessons. The main finding of this component of the study, an online survey of teachers (n = 102), is that teachers perceive time to be a significant barrier for the incorporation of both ICT and
real-world connections into their practice. Also, although the majority of teachers did not see using ICT as one of the most important means to convey relevance, there was a significant correlation between teachers who did find it important and those who use technology regularly with their
students by posing higher order tasks.
The Effects of Using Dynamic Geometry on Eighth Grade Students’ Achievement and Attitude towards Triangles
Authors: Turk Halime Samur , Akyuz Didem
Published: June 2024

This study investigates the effects of dynamic geometry based computer instruction on eighth grade students’ achievement in geometry and their attitudes toward geometry and technology compared to traditional instruction. Central to the study was a controlled experiment, which
contained experimental and control groups both instructed by the same teacher. 36 eight grade students from a middle school located in a rural area in Turkey participated in this experiment. None of the students had past experience in using computers especially for the purpose of learning
mathematics. The results revealed that dynamic geometry based computer instruction had a significant effect on students’ achievement in geometry compared to traditional instruction. Furthermore dynamic geometry based instruction had a significant effect on students’ attitudes toward
geometry and technology compared to traditional instruction. A correlation analysis showed a positive correlation between the achievement levels of the students and their attitudes towards geometry and technology.
Investigating the effects of Computer-Assisted Instruction on Achievement and Attitudes towards Mathematics Among Seventh-Grade Students in Kuwait
Authors: Soliman Dr. Mamdouh M. , Hilal Dr. Ahmed J.
Published: June 2024

This study evaluates the effectiveness of Computer-Assisted Instruction (CAI) compared with traditional classroom instruction of mathematics of seventh graders in Kuwait’s public schools. We aimed to compare students learning outcomes between two groups: the control group,
taught traditionally without the use of computers, and the experimental group, receiving CAI supported instruction in the same grade level. We examined the difference in learning outcomes and attitudes towards mathematics between the CAI and traditional instruction groups. This quasi-experimental
research followed the pre-test/post-test equivalent group design. The CAI group used a combination of discovery-environment and simulation software supported by the Cambridge HOTmaths environment. Results indicate that total gain in mathematics achievement from CAI is statistically significantly
higher than with traditional teaching methods. CAI was more effective in increasing students’ mathematical comprehension and application skills in the experimental group. Components related to the development of total attitude towards each of mathematics enjoyment, mathematics values,
mathematics learning, and attitude towards mathematics favored the experimental group. Overall, the significance tests supported our hypotheses that CAI could contribute effectively to teaching methods; made it possible to improve students’ mathematics achievement and increase positive
attitude towards the subject.
The Conceptualization of the Mathematical Modelling Process in Technology-Aided Environment
Authors: Hıdıroğlu Çağlar Naci , Güzel Esra Bukova
Published: June 2024

The aim of the study is to conceptualize the technology-aided mathematical modelling process in the frame of cognitive modelling perspective. The grounded theory approach was adopted in the study. The research was conducted with seven groups consisting of nineteen prospective mathematics
teachers. The data were collected from the video records of the participants’solutions related to the three mathematical modelling problems, their written solution papers, the GeoGebra solution files and the researchers’ observation notes. The technology-aided mathematical modelling
process included the eight components, the seven stages and the forty-seven sub stages. The components were complex real world situation, real world problem situation, model of real world problem situation, sub-mathematical models, mathematical model(s), mathematical solution, real world solution,
and a brief solution report. Additionally, the seven stages were problem analysis, constructing the systematic structure, mathematization, meta-mathematization, mathematical analysis, interpreting/evaluating, and validating model. It is considered that a comprehensive and different point of
view regarding the cognitive activities in the technology-aided mathematical modelling process was introduced.
Hypothetical Learning Trajectories that use Digital Technology to Tackle an Optimization problem
Authors: Elizondo-Ramírez Rubén , Hernández-Solís Armando
Published: June 2024

In this paper, we document the results of the implementation of a series of activities related to an optimisation problem. The objective is describing how the construction of mathematical meanings is promoted when the students face the problem through different representations. The
activities, addressed towards 15 year old students, surge from a free interpretation of the construct “Hypothetical Learning Trajectory” (HLT) by Simon (1995), considering different representations and utilising digital technologies. With this, we propose a route to tackle variation
problems based on HLT similar to the proposed.
Design And Use Online Platforms To Learn Mathematics And The Use Of Them In Simulations Of Problems In Applied Sciences
Authors: Méndez-Fragoso Ricardo , Villavicencio-Torres Mirna , Martínez-Moreno Josué
Published: June 2024

In this contribution, we show the practical use of the computer to visualise simple computational simulations to 'show phenomena that occur in everyday life, or require an abstract understanding for being unintuitive phenomena. The relationship of the mathematics to different scientific
disciplines motivates us to devise different treatments to find a solution for understanding and predicting what happens in nature. In this way, other scientific areas call for new mathematics and these in turn provide new discoveries. Today there are several computational tools to develop
learning units that enable allow understanding of different concepts. One is the Python language, which contains tools for numerical and symbolic calculations, and also for graphical visualisations with the advantage of being open and easy to learn. Currently, the Jupyter project is an environment
in which different languages come together under one programming scheme. In this manuscript, we show how we have adapted IPython Notebook to show some simulations on some phenomena related to geometric problems, numerical calculation and its applications in mechanical and electromagnetic systems.
In this way, the authors have designed a web site containing learning units based on examples of mathematical, physical and biological problems.
Analysis of a Nonlinear Oscillator with CAS through Analytical, Numerical, and Qualitative Approaches: a prototype for teaching
Authors: López-García Jeanett , Zamudio Jorge Javier Jiménez
Published: June 2024

It is very common to find in contemporary literature of Differential Equations, the need to incorporate holistically in teaching and learning the three different approaches: analytical, qualitative, and numerical, for continuous dynamical systems. However, nowadays, in some Bachelor
of Science that includes only one course in differential equations, it is difficult to introduce the qualitative and numerical approaches due to the excessive time that the analytical approach privileges, and the lack of skills programming of students. On the other hand, robust examples, that
can show more realistic features, become very complex and difficult, if not impossible to solve, so they require the students to go further than an analytical solution therefore these kinds of problems must be analysed as the three approaches suggested.
Automated Observation of Dynamic Constructions
Authors: Magajna Zlatan
Published: June 2024

Technology has changed school geometry in many aspects. Hand-made sketches can be substituted with precise dynamic constructions; computer software allows effective measuring of geometric quantities, persuasive visualisation, effective checking of properties, and even automated proving.
Observation – a process that is inherent in geometric thinking – is, surprisingly, rarely associated with dynamic geometry software. In the article we consider observation as a cognitive process, and the role of observation in geometric thinking, especially in proving geometric
facts. In the main part of the article we describe the principles of automated observation as is implemented in a computer program OK Geometry, designed for the observation of dynamic constructions. Automated observation helps in investigating geometric configurations, in generating hypotheses,
in inventing geometry tasks.
Integrating Technology into Mathematics Education in an Entire Educational System – Reaching a Critical Mass of Teachers and Schools
Authors: Prodromou Theodosia , Lavicza Zsolt
Published: June 2024

This paper reports on the implementation of the dynamic STEM- teaching and learning technologies in teachers’ classroom teaching practices resulting from their engagement in sustained professional development and classroom teaching of resources that embed carefully designed
dynamic STEM-technologies within the Hungarian mathematics and science curriculum (K 1-12). The research investigated teachers’ perceptions of the impact on students’ mathematical understanding when teachers integrate the materials and the technology into their teaching. The sample
comprised 773 mathematics and science teachers, who participated in Geomatech training over the entire period (2014-2015) of the project. Questionnaires were administered to match individual teachers’ teaching schedules, and the resulting data were analysed to give summative statistics.
The results indicate that teachers were able to plan tasks using Geomatech STEM resources for students to catch up with their learning, to cater to the learning needs of talented students, plan Geomatech tasks for project work and experimentation, and use them for homework tasks.
An Educational Application of Dynamic Geometry: Revisiting the “Recovery Position” in Tennis
Authors: Roanes-Lozano Eugenio , Sanchez Fernando
Published: June 2024

Usually, all the applications of dynamic geometry systems (DGS) presented to our students are strictly mathematical, meanwhile their interests are normally far away from mathematics. We would like to introduce here a motivating example outside the “standard applications”
of DGS, presenting a completely different application of this kind of software. It is well-known that a tennis player should not always recover to the centre of the court. Several authors and coaches maintain that the best place where a tennis player should recover (usually known as “recovery
position”) is a point that lies on the angle bisector of the angle formed by the union of all the possible trajectories of a shot of the opponent. The purpose of this paper is to show how a DGS can justify why the recovery position is nearby, but is not exactly on the angle bisector
of the aforementioned angle.
Comparing Computer Algebra Systems in Calculus I: TI-Nspire CAS versus TI-89
Authors: Laumakis Paul , Herman Marlena
Published: June 2024

The purpose of this study is to investigate whether or not students’ understanding of mathematical content typically covered in calculus courses is enhanced by using the TINspire CAS instead of the TI-89. The study was conducted over two phases at a mid-size university in the
northeastern United States in Calculus I and Accelerated Calculus I. In Phase 1, the TI-Nspire CAS calculator was used sporadically throughout one semester in experimental groups, while control groups used only the TI-89 calculator. Statistically significant differences favoring the TI-Nspire
CAS group occurred on 2 of 6 quizzes in Calculus I, but no statistically significant differences were found in Accelerated Calculus I. In Phase 2, the TI-Nspire CAS was used during every class of one semester in experimental groups, while control groups used only the TI-89. No statistically
significant differences were found in Calculus I, but statistically significant differences favoring the TI-Nspire CAS group occurred on the last 2 of 7 quizzes in Accelerated Calculus I. Students reported a very steep learning curve when using the TI-Nspire CAS, causing up to a whole semester
of fully integrated use to become comfortable enough to use it effectively. They appreciated the dynamic graphical capabilities, especially grab-and-drag and data-capture features. However, they were indifferent to “pretty print” symbolic manipulations, holding the belief that
they should know how to do calculations by hand. Recommendations for educators are provided.
“That Journal has a History”: Overview of the Technological Tools and Theories Studied in theInternational Journal for Technology in Mathematics Education,2004-2018
Authors: Fujita Taro
Published: June 2024

This paper constructs an overview of the historical development of the International Journal for Technology in Mathematics Education (IJTME) during the period 2004-2018. The titles of the published papers in this period are examined, focusing on what technological tools were studied, and what theoretical ideas were used to study the teaching and learning of mathematics with technology. This analysis shows the ways in which the IJTME has particularly focused on how students use, or can be helped to use, technological tools (mainly CAS, dynamic geometry software and calculators), as opposed to other possible topics such as historical analysis, policy, or international comparisons in the teaching and learning of mathematics with technology. The areas of mathematics primarily addressed by the articles are algebra and geometry, informed by the development of certain theoretical ideas (from instrumentation theory to activity theory for example) over the last 15 years. While the journal should keep investigating this area of research, it is also essential to extend the journal’s scope to wider perspectives including sustainability of historical developments of technological tools, book review, systematic literature review, dialogues between our community members through commentaries on the published papers, and so on.
The Comparative Effects of Concrete Manipulatives and Dynamic Software on the Geometry Achievement of Fifth-Grade Students
Authors: Disbudak Ozge , Akyuz Didem
Published: June 2024

Concrete manipulatives and dynamic geometry software (DGS) are both commonly used for geometry education in elementary and middle schools. This study sets out to understand which of the two approaches was better in improving the conceptual understanding of quadrilaterals for fifth graders. A pre-/post-test design was conducted in which the same topic was taught by the same teacher to three groups of students, with each group receiving a different type of instruction, namely concrete manipulative based, DGS based and paper-and-pencil based. The initial levels of the students were almost equal as determined by pre-tests. Quantitative analysis of post-test scores revealed that the DGS based approach contributed most to students’ geometrical understanding, followed by the concrete manipulative based approach. Interviews and qualitative analysis were also conducted to gain deeper insights into students’ reasoning and the effect of different instruction types. The interview results revealed that more students in the DGS group could overcome the misconceptions and difficulties than the students in other groups.
Synthetic Proof with the Support of Dynamic Geometry
Authors: Blažek Jirí , Pech Pavel
Published: June 2024

The paper deals with searching for synthetic solution supported by the means of dynamic geometry. It consists of two parts. The first one describes how software influences searching for synthetic solutions of geometric problems. The second one describes a small pilot experiment in
which students of Faculty of Education solved two more difficult tasks of secondary school level. Obtained results demonstrate that the software (GeoGebra) helped considerably, nevertheless many students had troubles with choosing and applying relevant mathematical theorems during the proving
process. A few students did not reach the solution even though they found all relevant facts.
The Using of Monte Carlo Simulation in the Teaching Process
Authors: Šedivá Blanka
Published: June 2024

The Monte Carlo method is one of the basic simulation statistical methods which can be used both to demonstrate basic probability and statistical concepts as well as to analyse the behaviour stochastic models. The introduction part of the article provides a brief description of the
Monte Carlo method. The main part of the article is concentrated on three practical exercises that demonstrate advantages of the Monte Carlo approach in several parts of mathematics. The exercises are proposed for university courses but can be used also as an advanced application on secondary
math school. The first example is focused on the classical use of the Monte Carlo method for calculating the area of polygons, the second and third examples are directed to the application of the Monte Carlo method for demonstrating the basic properties of different types of statistical estimations.
Classroom Connectivity Technology to Enhance the Social Construction of Mathematical Knowledge
Authors: Castrillón-Velandia Oscar , Hernández-Rodríguez Omar
Published: June 2024

This study focuses on how the combined use of graphic calculators with connectivity software promotes the social construction of mathematical knowledge. Particular emphasis is placed on the aspects related to design, development, implementation, and evaluation of didactic activities
that integrate these technologies. We use Didactical Engineering (DE) and Realistic Mathematics Education (RME) as frames of reference. Twenty, eighth grade students from a private institution in the metropolitan area of San Juan, Puerto Rico participated. The topics discussed were those related
to the conic sections as geometric loci. The results show that the careful planning of graphing calculator integrated with a system of connectivity in the classroom promotes the discussions and reflections of students. These reflections provide insight as to how students engage in the social
construction of mathematical knowledge. In addition, students showed that they could reflect on powerful mathematical ideas and acquire meaningful knowledge.
Atina Demokrasisinin Kamusal İnceleme Prosedürü Üzerine: “Dokimasia”
Authors: Kundakçı Deniz
Published: June 2024

Bu çalışma, modern kamusal denetimin henüz gelişmediği bir tarihsellikte, demos iktidarını garanti altına almak için geliştirilmiş hukuki ve siyasi bir prosedür olan dokimasia’yı değerlendirme amacını taşımaktadır. Çalışmada, Türk siyasal düşünce literatüründe ihmal edilmiş “dokimasia” adı verilen bir uygulama özelinde, Atina kent devletindeki kamusal denetim süreçleri ve bu süreçlerin demos egemenliği üzerindeki etkileri değerlendirilmeye çalışılmıştır. Dolayısıyla çalışmanın kapsamı yalnızca Atina kent devleti sınırları içindeki dokimasia uygulamalarını içermektedir. Kronolojik tarihsellik ise özellikle MÖ beşinci ve dördüncü yüzyıllar ile sınırlı tutulmaya çalışılmıştır. Makalede modern literatüre ait temel kaynakların yanında, konu ile ilgili Lysias, Demosthenes ve Aechines’in mahkeme kayıtlarına geçmiş söylevleri ve Aristoteles, Ksenophon, Platon ile Plutarkhos’un metinlerinden yararlanılmıştır. Yapılan değerlendirmede dokimasia türleri altı kategoride sınıflandırılmış olup, çeşitli örnekler üzerinden mukayeseli bir şekilde ele alınmıştır. Bunlar sırasıyla yurttaşlık dokimasia’sı, engelli yardımı almak isteyenlere yönelik dokimasia, memur ve boule üyeliklerine ilişkin dokimasia, süvari ve atların denetlenmesi konusundaki dokimasia, hatip dokimasia’sı ve yurttaşlık hakkı elde etmek isteyen yabancıların dokimasia’sıdır. Uygulamanın kökeninde bir kamu görevine atanacak ya da kamusal bir imtiyazdan faydalanacak kişinin, hukuki ve siyasi yönden incelenmesi ve asgari yeterliliği taşıyıp taşımadığı sorgulanmaktadır. Dolayısıyla uygulama, bazı istisnalar dışında, doğrudan cezai bir işlem doğurmaktan ziyade, idari bir işlem niteliği taşımaktadır. Sürecin demos egemenliğini temsil eden konsey (boule meclisi) üyeleri ya da mahkemede jüri üyeleri huzurunda yürütüldüğü tespit edilmiştir. Çalışma, tarihsel ve olgusal bir nitelik taşıyan bir kavram hakkında betimleyici ve özellikle mukayeseli bir yöntem yoluyla ele alınmıştır. Demos egemenliğinin güvence altına alınmasına hizmet eden söz konusu uygulama, kamu idaresi ve denetiminin tarihselliğinin anlaşılması açısından da değer taşımaktadır.
New insight into the phase changes of gypsum
Authors: Krejsová Jitka , Kužel Radomír , Keppert Martin , Scheinherrová Lenka , Vimmrová Alena
Published: June 2024

The phase changes of gypsum were considered to be sufficiently understood for a long time. However, due to the increasing importance of gypsum recalcination (connected with the planned closure of thermal power plants resulting in a lack of FGD gypsum) and new detailed research associated with it, gaps in the current knowledge have been discovered. This paper clarifies phenomena occurring during the production of gypsum binder, anhydrite, and potentially eco-friendly calcium sulfate-based ceramics at 22–1300 °C by in-situ XRD, thermal analysis, and SEM. It was found that undesirable insoluble anhydrite II arises even in the temperature range from 40 to 90 °C despite the current state-of-the-art. New knowledge about the existence of the individual phases, microstructure (cracking of crystals; fragmentation and sintering of anhydrite AII at temperatures above 700 °C when a ceramic-like material is formed), and their external consequences (changes in moisture and heat transport properties) has been gained.