bluuebunny/crossref_metadata_2025 huggingface dataset:
ይዘት ተኮር የቋንቋ ማስተማሪያ ዘዴ በአማርኛ ቋንቋ ትምህርት የ10ኛ ክፍል ተማሪዎችን አከራካሪ ድርሰት ከመጻፍ ክሂል አላባውያን ውስጥ ይዘትን እና የግለብቃት የመጻፍ ተነሳሽነት ላይ ያለው አስተዋፅዖ
Authors: Yitayew Ayalsew
Published: November 2024

የጥናቱ ዋና ዓላማ ይዘት ተኮር የቋንቋ ማስተማሪያ ዘዴ በአከራካሪ ድርሰት ከመጻፍ ክሂል አለባውያን ውስጥ ይዘትን  እና ከተነሳሽነት መገለጫ ከሆኑት ውስጥ የግለ ብቃት የመጻፍ ተነሳሽነትን ማጎልበት ላይ ያለው አስተዋፅዖንን መመርመር ነው፡፡ የጥናቱ ንድፍ ባለሁለት ቡድን ሙከራዊ ነው፡፡ የጥናቱ ተሳታፊዎች በአዲስ አበባ መስተዳድር በዳግማዊ ምኒልክ 2ኛ ደረጃ ትምህርት ቤት በ2014 ዓ.ም 10ኛ ክፍል ትምህርታቸውን በመከታተል ላይ ከነበሩ 609 /ስድስት መቶ ዘጠኝ/ ተማሪዎች መካከል በእድል ሰጪ ንሞና የተመረጡ የ10 ኛ - C ፣ የ10 ኛ- E እና የ10ኛ - H ክፍል  ቡድኖችን ቅድመ የጽሁፍ ፈተና በመፈተን ተቀራራቢ ውጤት ያገኙትን የ10 ኛ - C እና የ10ኛ - E -ቡድኖች ለሙከራ እና ለቁጥጥር ቡድን ተሳታፊ እንዲሆኑ ተደርገዋል፡፡ ከእነሱም በፈተና፣ በጽሑፍ መጠይቅ እና በምልከታ አማካይነት የጥናቱ መረጃዎች ተሰብስበዋል፡፡ በቅድመፈተና እና በቅድመ የጽሁፍ መጠይቅ የተገኙ ውጤቶች በነጻ ናሙና ቲ- ቴስት (Independent samples t-test) ተተንትነዋል፡፡ በትንተናው  የተገኙት ውጤቶች እንደ ሚያመለክቱት በቅድመ ፈተና እና በቅድመ የጽሑፍ መጠይቅ ተመጣጣኝ አማካይ ውጤቶች የተመዘገበባቸው ቡድኖች፣ በድኅረፈተና በመጻፍ ክሂል  ውስጥ  ካሉት  አላባውያን ውስጥ ይዘት እና በድኅረ የጽሑፍ መጠይቅ ደግሞ ግለብቃትን የሙከራ ቡድኑ ተማሪዎች ከቁጥጥር ቡድኑ ተማሪዎች ጉልህ የሆነ ልዩነት አሳይተዋል (P= <0.05)፡፡ ከዚህም በመነሳት ይዘት ተኮር የቋንቋ ማስተማሪያ ዘዴ የተማሪዎችን በአከራካሪ ድርሰት የመጻፍ ክሂል አላባውያን ውስጥ ይዘትእና ከመጻፍ ተነሳሽነት ግለብቃትን ለማጎልበት ከተለመደው የማስተማር ዘዴ የበለጠ ውጤታማነት አለው ከሚል መደምደሚያ ላይ ተደርሷል፡፡ በጥናቱ ውጤት መሰረትም ይዘት ተኮር የቋንቋ ማስተማሪያ ዘዴ የተማሪዎችን በአከራካሪ ድርሰት የመጻፍ ክሂል አለባውያን ውስጥ ይዘት እና ከመጻፍ ተነሳሽነት ግለብቃትን ለማጎልበት ያለው ውጤታማነት ጠቃሚ መሆኑ በመፍትሄነት ተጠቁሟል፡፡
ቁልፍ ቃላት፣  ይዘት፣ አደረጃጀት፣ ተነሳሽነት፣ ግለብቃት፣የመጻፍ ክሂል ችሎታ ድርሰት
Analysis of the Space Frame Structure of the Cileungsi Fly Over Tower Bogor Regency
Authors: Budiono Budiono , Irianto Singgih , Arief Budi , Lirawati Lirawati
Published: November 2024

This research is part of the plan of the Bogor Regency government, especially Cileungsi District, in arranging the Cileungsi flyover which is currently filled with garbage and used as a shadow terminal, making the area look slum. The arrangement effort is made to create a comfortable, neat flyover that can become an icon of Bogor Regency. The research aims to produce a portal tower flyover design that is aesthetic, unique, sturdy, and meets the strength and stability standards of the structure according to local conditions. The analysis was carried out using SAP2000 software to model the three-dimensional space structure and identify the strength, stability, and deflection of the structure. The LRFD (Load Resistance Factor Design) method is used in calculating the bearing capacity of the structure. The results of the analysis show that the space frame structure made of steel pipes has stable and rigid behavior, meeting all work loads, including dead loads, live loads, wind, and earthquakes. The design of the 13-meter deep pile foundation has also been proven to be able to withstand loads safely. The design of the space frame structure made of steel pipes for the Cileungsi flyover portal tower is declared strong, stable, and safe to implement. This structure can be used as a new icon for Bogor Regency, especially Cileungsi District. The implementation of this design requires detailed depiction as a construction guideline in the field.
Management of the Maxillary Labial Frenum
Authors: Shin Jonghyun
Published: November 2024

This study examined the maxillary labial frenum (MLF) and its clinical implications, focusing on its anatomy, developmental changes, and management strategies. The MLF functions as a connective tissue linking the upper lip to the alveolar ridge, facilitating essential processes such as speech production, food consumption, and the maintenance of proper dental alignment. Abnormal development or attachment can result in midline diastema, speech difficulties, and breastfeeding challenges. During growth, the MLF typically migrates from the alveolar crest in infancy to the mucogingival junction by adulthood; however, in some cases, this migration fails, leading to persistent diastema or other oral health concerns. The timing of frenectomy remains unclear. Certain experts advocate for early intervention to facilitate orthodontic treatment, while others recommend postponing surgical procedures until orthodontic efforts are completed, as the majority of diastemas close naturally with the eruption of permanent canines. In instances where diastema persists, frenectomy may be necessary to prevent relapse. Restrictive frenum attachments have been linked to breastfeeding difficulties; however, feeding outcomes can also be influenced by factors such as maternal technique and infant feeding patterns. This review highlights the need for individualized assessment and treatment planning, balancing surgical intervention with natural development, to ensure the best outcomes for each patient.
Oral Health Status of Korean Students and Associated Fasting Plasma Glucose in Overweight/Obese Individuals
Authors: Kim Hyeonjin , An Soyoun
Published: November 2024

This study aimed to evaluate the current oral health status of Korean children and adolescents and investigate the correlation between fasting plasma glucose levels and oral health in individuals with overweight and obesity. A total of 121,682 participants were selected from the Survey of School Health Examination data provided by the Ministry of Education over the last 5 years to assess recent oral health status and related factors. Among them, 18,105 students with overweight or obesity who had their fasting plasma glucose levels measured were assessed for blood glucose-related analysis. Based on fasting blood glucose levels, the participants were categorized into normal, impaired fasting glucose, and diabetes groups. The associations of these groups with dental caries, oral hygiene, and periodontal diseases were investigated. There were significant associations between demographic factors, health-related behaviors, and blood glucose levels with oral health. Increased fasting blood glucose levels were associated with poor oral health. These results suggest that glycemic management is important in enhancing the oral health of overweight and obese children and adolescents.
Effects of Dental Sound Insulation System on Stress and Dental Fear Reduction in Pediatric Patients
Authors: Han Sangkyu , Lee Jaeho , Lee Ko Eun , Lee Taeyang , Park Wonse , Song Je Seon
Published: November 2024

This study aimed to assess the effectiveness of dental sound insulation in alleviating stress and fear during dental scaling in pediatric patients. It also examined the influence of a noise-canceling application on dentist-patient communication and convenience of dental procedures. This study included 60 children and adolescents aged 7 - 16 years between April 2022 and March 2023. All participants underwent dental plaque control using an ultrasonic scaler on the maxilla first, followed by plaque control on the mandible. Dental sound insulation with active noise canceling was randomly applied to either the maxilla or mandible. Findings revealed that the stress index was significantly reduced when the application was used, with a score of 5.85 compared to 8.43 without it (p < 0.0001). Similarly, the dental fear score was significantly reduced to 1.17 with the application, as opposed to 2.97 without it (p < 0.0001). The dental sound insulation did not affect the communication between dentists and patients or the convenience of treatment. This study demonstrated that active noise canceling during pediatric dental care significantly reduced stress and fear, suggesting that it could be a valuable behavior guidance tool, particularly for children who find dental visits challenging.
Root Growth and Apical Foramen Closure Velocity of Maxillary Permanent Central Incisor in Korean Children
Authors: Kim Sung-Joo , Kim Hyuntae , Song Ji-Soo , Shin Teo Jeon , Kim Young-Jae , Kim Jung-Wook , Jang Ki-Taeg , Hyun Hong-Keun
Published: November 2024

This study aimed to evaluate the growth velocity of root elongation and the timing of apical foramen closure in maxillary permanent central incisors using panoramic radiographs. The study also examined the timing of alveolar eruption and its relationship with root development while considering potential sex-specific differences. The study included 176 patients (94 males, 82 females) from the Seoul National University Dental Hospital, each with three or more panoramic radiographs taken between 2014 and 2023 and analyzed to measure the crown length, total tooth length, root length, and mesiodistal width of the apical foramen. Root lengths were expressed as percentages of the fully developed stage. Scatter plots and polynomial trend lines were used to evaluate the relationship between age and tooth development, with intraobserver reliability assessed using Cohen’ s kappa. Root growth velocity peaked during the early stages of development, with females generally exhibiting earlier and faster apical foramen closure than males. Significant correlations were found between the root length and apical foramen width (Pearson correlation coefficients, males, -0.907; females, -0.887, p < 0.0001). The mean age for alveolar eruption was 7.27 years for males (N = 16) and 7.10 for females (N = 17), predominantly at Demirjian stage F. The study presents the critical periods of rapid root elongation and apical foramen closure in the maxillary central incisors, underscoring their importance for clinical dental practice. Future research is warranted to provide a more comprehensive understanding of human dental development.
Data Discovery: A pick-n-mix library of useful FAIR Data searches – and a call for new search suggestions.
Authors: Rzepa Henry
Published: November 2024

With AI and Machine learning needing data in abundance, interest in data discovery is intense. However, this type of discovery is somewhat different from more traditional data base searches, in that it is particularly suited for machine discovery as well as by humans. The discovery searches are conducted using an aggregated and federated metadata store, such as that curated by DataCite.
The negative differential resistance of nitrogen implanted TiO2
Authors: Liu Chun-Ming
Published: November 2024

The microstructure and negative differential resistance (NDR) effect of nitrogen implanted rutile TiO2 were investigated by measuring the XPS, Raman spectra and current voltage curves. It was found that the light illumination has large influence on the NDR effect. Under the illumination of 60 mW laser light, a large NDR with a small electric field (1250 V/cm) is obtained. This electric field is about three orders smaller than that reported in literature (1×106 V/cm). The electric field induced tunneling is the possible mechanism of electric transport at higher field region. The NDR is thought to be related to the light and nitrogen dopant induced reaction including the destroying of water, the scavenging of electron, and the surface oxidation transform of non-stoichiometric TiO2−x to stoichiometric insulating state. The results of this paper are not only useful in understanding the mechanism of NDR, but also useful in providing an effective method in manipulation NDR.
Tetrahedral DNA nanocages as delivery agent for biological and biomedical applications
Authors: Dahle Landon , Vaswani Payal , Bhatia Dhiraj
Published: November 2024

Tetrahedral DNA nanocages have emerged as highly versatile tools for delivering a wide range of biological agents by leveraging their unique structural properties and functional adaptability. This review critically examines the field of tetrahedral DNA nanocages as delivery agents, communicating key findings and insights from existing literature. An extensive examination of the advantages of tetrahedral DNA nanocages as drug-delivery vehicles is outlined, with specific emphasis on their exceptional cargo encapsulation efficiency and controlled release capabilities. An in-depth exploration of in vivo studies and preclinical models is provided, encompassing comprehensive assessments of therapeutic efficacy, pharmacokinetics, toxicity, safety, and targeting capabilities. Moreover, the potential of tetrahedral DNA nanocages in regenerative medicine applications is highlighted. To address future challenges and directions in the field, the review emphasizes the importance of optimization of large-scale synthesis and translational studies. The significant role of tetrahedral DNA nanocages as delivery agents is underscored, showcasing their potential to revolutionize the landscape of targeted and programmable therapeutic interventions.
Progression to cancer in patients with confirmed dysplasia compared to dysplasia downgraded to non-dysplastic metaplasia in Barrett’s esophagus: a retrospective cohort study in Sweden
Authors: Elbe Peter , Öst Åke , Mellbom Lennart , Thorell Anders , Håkanson Bengt , Klevebro Fredrik , Lindblad Mats
Published: November 2024

Background/Aims: This study aimed to clarify the risk of progression in patients with non-dysplastic Barrett’s esophagus (NDBE) and patients with confirmed low-grade dysplasia (LGD) and indefinite for dysplasia (IND) after an expert pathologist review of patients with BE with suspected dysplasia in a prospective cohort.Methods: Patients with Barrett’s esophagus diagnosed with dysplasia at Ersta Hospital in Stockholm from 1998 to 2012 were included. The first dysplastic specimen in all patients was re-evaluated by two expert pathologists and classified as NDBE, LGD, IND, or cancer, including high-grade dysplasia. The incidence rates (IRs) and IR ratios were calculated with 95% confidence intervals.Results: Of 423 patients with Barrett’s esophagus with dysplasia, 266 (62.9%) were re-classified as NDBE, 83 (19.6%) had LGD, 71 (16.8%) had IND, and 3 (0.7%) patients had cancer. During the follow-up, 34 (8%) patients developed cancer, most of them within five years, while others progressed after up to 25 years of surveillance. IRs for cancer among patients with NDBE was 0.41%/year compared to 1.84%/year for LGD (p<0.001) and 1.43%/year for IND (p=0.008).Conclusions: Long-term risk of progression to cancer did not differ between patients with confirmed LGD and IND. These findings suggest that patients with IND should undergo similar management as patients with LGD.
Vaginal birth after four Cesarean deliveries: A case report
Authors: Nassozi J , Tung’ani C.M , Kariuki E.N
Published: November 2024

Background: Vaginal birth after cesarean (VBAC) is rarely offered as a delivery option, for gravid women with more than two cesarean deliveries, due to the increased risk of adverse fetal and maternal outcomes.Case presentation: A 38-year-old Para 4+0 Gravida 5 who had had four previous cesarean deliveries was admitted in the second stage of labor in Maragua sub- county hospital. She delivered a live male infant by spontaneous vaginal delivery with no complications. She had an open bilateral tubal ligation on day two post-delivery and was discharged on day three post-bilateral tubal ligation.
Conclusion: Vaginal delivery after cesarean delivery, while not recommended, is possible even in patients who have had multiple caesareans deliveries. Patient sensitization about antenatal care and involvement in their birth plans should also be prioritized.
Symptoms of endometriosis among indigenous African women
Authors: Gichuhi Joseph W. , Ogeng’o Julius A. , Gichangi Peter B.
Published: November 2024

Background: Endometriosis is a common gynecological disease that significantly impacts women's health. It presents with dyspareunia, dysmenorrhea, chronic pelvic pain, and infertility. Globally, the prevalence of endometriosis is estimated to be 10 , with comprehensive literature on its % clinical presentation in developed countries. However, only scant literature exists in Africa.Objective: To determine the symptoms of endometriosis in indigenous African women.
Methods: This was a prospective analytical cross- selection study that enrolled indigenous African women undergoing laparoscopic surgery in two tertiary hospitals in Nairobi, Kenya. The study population included women aged 18-49 years scheduled for laparoscopic surgery. Data on patient history, clinical, laparoscopic, and histopathological findings were entered and analyzed using the IBM statistical package for social sciences (SPSS), version 22.0. The statistical significance was set at p<0.05.
Results: Between March 2018 and March 2021, 443 women were enrolled in this study. The mean age was 33. The prevalence of histologically confirmed endometriosis was 6.8. Chronic pelvic pain (scale % 8-10), dysmenorrhea, and dyspareunia were the significant symptoms of endometriosis (p<0.001). Nulliparous patients were more likely to develop endometriosis (OR=4.1 (1.6 10.2)). Women with menarche at ≤13 years had a significantly higher risk of developing endometriosis (p=0.001). There was no correlation between infertility and endometriosis (p=0.031).Conclusion: The prevalence of histologically confirmed endometriosis in indigenous Africans was 6.8 . % Endometriosis prevalence in Africa is comparable to the worldwide prevalence, and as such, with its morbidity, it warrants close attention. Chronic pelvic pain, dysmenorrhea, and dyspareunia are significant symptoms of endometriosis, and as such, patients with these symptoms should be investigated for endometriosis.
Confiscation of Copyrights in Investigations of Criminal Actions in the Field of Taxation and Tax Collection
Authors: Perdana Chakim Yudha , Sulistyanta
Published: November 2024

This article discusses the confiscation of copyright as a form of intellectual property in the investigation of criminal acts in the field of taxation and tax collection. Copyright legal provisions recognize the moral right of creators to defend their rights from things that are detrimental to their personal honor or reputation through certain legal measures, while tax law regulates the authority to carry out confiscation in the event of criminal acts in the field of taxation or unpaid tax debts. This can cause conflicts between legal provisions in their implementation and raise questions about how to confiscate copyright as an intangible movable object. To answer this question, the author carried out a juridical analysis of the provisions of Copyright law and confiscation, prepared arguments for the relevance of Copyright confiscation, and drew conclusions inductively based on the results of the analysis. With the conclusion that there is a legal basis for confiscation related to investigations, but regarding tax collection it does not have sufficient legal basis and requires further regulation of confiscation authority. The exercise of confiscation authority that is not against the law will not conflict with the Creator's legal efforts to defend his rights.
Degrowth between normativism and reality
Authors: Kunčič Aljaž , Svetličič Marjan
Published: November 2024

This article addresses the increasing debates over the limitations of high-growth models that have contributed to environmental degradation and polycrises. Based on a comprehensive literature review, we look into the basic characteristics and differences between the alternative degrowth and similar new development models; examine the paradigm through the lens of its critics; and look into its viability. The analysis highlights that while degrowth presents a theoretically compelling alternative to traditional growth models, it faces significant practical challenges in implementation, particularly due to its reliance on deep systemic changes and shifts in public values. In the empirical section, we test the hypothesis that countries with better sustainable development progress are more successful than those prioritizing economic outcomes. To do this, we show graphically and analyze the correlation between the average GDP growth and changes in the sustainable development measure using Pearson’s correlation coefficient. We rank countries based on their sustainable development and economic performance, averaging these rankings to identify potential degrowth leaders over the past 20 years. Our findings indicate that, while theoretically appealing, the degrowth model faces significant challenges in practice, with no statistical evidence supporting a negative correlation between degrowth and sustainable development progress.
On the economic sustainability of Russian households at a socially acceptable level
Authors: Gulyugina Aleftina , Odintsova Elena
Published: November 2024

The paper is focused on determination and analysis of the thresholds for socially acceptable criteria of economic sustainability for households of different composition. The paper shows the key methodological aspects of determining the economic sustainability of households and its socially acceptable criterion. The main macroeconomic conditions for the formation of economic sustainability of households in Russia are also considered. Besides, the characteristics of employment for the people living in economically (un)sustainable households have been identified and analysed. The basis for the household economic sustainability, according to the authors, is self-sufficiency that enables using its own resources to support the socially acceptable level of consumption of socially significant goods and to accumulate savings subject to the resources’ limitations and social risks. The socially acceptable consumer budget is used as the criterion for identification of the household economic sustainability, including the specifics of the consumption of the main socio-demographic groups of the population (population of working age, pensioners, children) and savings in consumption due to cohabitation. Differentiating features of the threshold values for the households of different types are determined in the paper. It is shown that the threshold values of the criterion for economic sustainability of households per household member decrease as the number of minor children per 1 adult increases. However, the income position of such households worsens and, in conditions of unsustainability, the income deficit increases relative to the threshold value. It is revealed that there are no unemployed individuals among the people from economically sustainable households (unlike those living in economically unsustainable ones), while the situation regarding the share of the employed and the level of income from employment varies, depending on the composition of households, indicating different “strategies” for achieving sustainability of their households.
How do socio-demographic factors affect green finance growth?
Authors: Vukmirović Valentina , Kojić Milena , Spasenić Željko , Milosavljević Miloš
Published: November 2024

Hitherto, green finance provides lower returns as compared to their “plain” counterparts, and as such, might be less attractive to financial markets. This study aims to analyse the impact of sociodemographic factors on green finance growth at the national level. We employ a panel-pooled mean group-autoregressive distributive lag (PMG-ARDL) model to assess the long-term influence of selected sociodemographic indicators on government budget allocations for R&D (GBARD) with environmental objectives as a proxy for green finance spanning 21 European countries from 2000 to 2021. Specifically, we investigate the impact of the unemployment rate, population density, gender ratio, ratio of education expenditure to GDP, proportion of the population aged 15-64, and the Gini coefficient on the GBARD with environmental objectives. The core results demonstrate that all the examined indicators exert a positive and statistically significant long-term impact on the allocation of government budgets for the GBARD with environmental objectives, highlighting the critical role of sociodemographic contexts in shaping environmental investment strategies.
Impact of population ageing on fiscal balance in the European Union
Authors: Filipović Sanja , Miljković Marko
Published: November 2024

In the past two decades, the EU has experienced low fertility rates and declining mortality rates leading to population ageing. Although increasing immigration and longer life expectancy reinforced population growth, these trends could not counterbalance the negative impact of low birth rates on labour supply. Demographic transition towards an aging society is characterised by increase of public health and pension expenditures, as well as decrease of tax revenues that are triggers for fiscal imbalance. The paper aims to analyse the effects of population ageing on government fiscal balance in the EU-27 by applying modern methods of panel data analysis in the period 2001-2021. The dependent variable is general government fiscal balance, while the explanatory variables are related to demographic transition indicators (population aged over 64 in total population, old-age dependency ratio, and health expenditures) and macroeconomic control variables. The results of research show that population ageing has created a significant negative impact on fiscal balance of the EU countries, which was confirmed by all the analysed models. The fixed-effects panel threshold model did not identify a statistically significant threshold of any demographic transition indicator, concluding that population ageing has equally negatively affected fiscal balance, independent of the values of demographic transition indicators.
Environmental attitudes among Serbian university students
Authors: Hanić Aida , Minović Jelena , Stevanović Slavica , Mitić Petar
Published: November 2024

This article aims to analyse the attitudes of Serbian university students towards environmental issues and risks, as it is crucial to understand these attitudes to shape future environmental policies and promote sustainability initiatives. The survey, which covered socio-demographic, economic, and environmental variables, gathered insights for gaining insights into environmental awareness and important factors promoting pro-environmental behaviour among youth. In total, 165 responses were obtained. A Chi-square test of independence and a logistic regression model was employed for analysis. The survey results show university students perceive inadequate recycling habits (65%) and limited green spaces (73%) in their cities. They consider the environmental risks considerable, possibly leading to migration (66%) and urban depopulation (47%). They advocate for increased awareness campaigns (66.7%) and greater use of renewable energy (64.2%), as well as stricter penalties for environmental violations (61.8%). The analysis revealed a significant relationship between self-assessed environmental awareness and actual environmental behaviour, with students who reported higher awareness being more likely to engage in environmentally friendly actions. Gender and family recycling habits were significant predictors of environmental behaviour, with females and students from the families with recycling practices more likely to exhibit pro-environmental behaviour. These results indicate that the surveyed university students have developed environmental habits and awareness. Supporting youth is central to tackling environmental issues and promoting sustainable behaviour. In addition to educational efforts in Serbia, this requires comprehensive government and civil society initiatives.
Guest editors' introduction
Authors: Zvezdanović Lobanova Jelena , Štrbac Dijana
Published: November 2024

No.
Sample Size and Statistical Power Calculation in Multivariable Analyses: Development and Implementation of "SampleSizeMulti" Packages in R
Authors: Vera-Ponce Víctor J. , Zuzunaga-Montoya Fiorella E. , Sanchez-Tamay Nataly M. , Vásquez-Romero Luisa E.M. , Loayza-Castro Joan A. , Huaman-Vega Christian H. , Tapia-Limonchi Rafael , De Carrillo Carmen I.G.
Published: November 2024

This paper presents advanced methodological approaches and practical tools for sample size calculation in epidemiological studies involving multivariable analyses. Traditional sample size calculation methods often fail to account for the complexity of modern statistical analyses, particularly regarding the correlation between covariates in multivariable models.
We introduce a series of R packages (SampleSizeMulti) designed to address these limitations. These packages offer two distinct calculation approaches: one based on the multiple correlation coefficient between covariates (rho-based method) and another utilizing standard errors from previous studies (SE-based method). These complementary approaches provide comprehensive solutions for different association measures commonly used in epidemiological research: prevalence ratios, odds ratios, risk ratios, and hazard ratios.
The rho-based method innovatively incorporates the explicit consideration of the multiple correlation coefficient between covariates, significantly impacting required sample sizes in multivariable analyses. The SE-based method leverages information from previous studies through their confidence intervals, offering an alternative when correlation estimates are unavailable but published results exist. Furthermore, both approaches integrate crucial logistical considerations, including rejection rates, eligibility criteria, and expected losses to follow-up, providing researchers with realistic estimates of recruitment requirements and timelines.
Seven detailed case studies covering various epidemiological study designs and analytical scenarios demonstrate the practical application of these methods. These examples illustrate how correlation values, standard errors, and logistical factors influence sample size calculations and study planning.
The implementation in R ensures accessibility and reproducibility, while the incorporation of logistical planning tools bridges the gap between theoretical calculations and practical research requirements. These methods represent a significant advancement in study design methodology, potentially improving the quality and efficiency of epidemiological research by ensuring adequate statistical power while optimizing resource utilization.
Oxidative decomposition of thin films of oleyl and stearyl alcohols on steel surface
Authors: Bražinskienė Dalia , Strakšys Antanas , Voišnienė Violeta , Vilkauskaitė Rasa , Asadauskas Svajus
Published: November 2024

Fatty alcohols and their derivatives are popular additives in shampoos, cosmetics, paints, lubricants and other functional fluids, whose films are exposed to the environment. Often these films degrade due to oxidative, thermal, catalytic and other stress factors, producing volatile emissions. Decomposition of fatty materials is rarely viewed as a significant contributor to vapour losses, however, it cannot be assumed that fatty alcohols are completely non-volatile. In this study, oxidative degradation of thin films of oleyl and stearyl alcohols was investigated on the steel surface. Tests at 90 °C showed that within several hours significant portions of these alcohols were lost to volatile emissions. Initially the absolute evaporation rates did not depend on the film thickness and appeared quite similar for both alcohols. In later stages, the evaporation rate of thinner films went down due to the formation of oxidative polymers and functional group oxidation. Acidity of oleyl alcohol increased much more rapidly than that of stearyl. After long-term degradation oleyl alcohol produced gel-like solids, while films of stearyl alcohol began to retain a liquid state at room temperature. Since the volatile emissions amounted to more than 60%, the decomposition products in final applications should be investigated in more detail when stearyl or oleyl alcohols are used as major constituents in commercial liquids.
Reductor sostenible de emisiones de CO2 elaborado con fibra de coco “ECO2 FILTER”
Authors: Rodríguez Jiménez Carlos , Guerra Sanchinelli José Fernando , Aguilar Torres Jorge Luis , Toledo Linares Reyna Lizbeth
Published: November 2024

La presente investigación es cuantitativa y del tipo descriptiva. Se enfoca en el diseño y fabricación de un filtro de dióxido de carbono (CO2) para la industria petrolera, utilizando la fibra de coco como adsorbente. La preocupación por el cambio climático ha llevado a una mayor atención en la reducción de las emisiones de gases de efecto invernadero (GEI), entre los cuales, el CO2 es uno de los más significativos [1]. Dado este contexto, se revisan las características físicas y químicas del CO2, y las normas nacionales e internacionales para el control en la emisión de GEI.
Así mismo, se abordan los fundamentos de adsorción, destacando la importancia de las fuerzas de Van der Waals en la adsorción de gases y la capacidad de materiales como la fibra de coco, para adsorber dióxido de carbono. Se explora el uso de este material, debido a sus propiedades físicas y químicas, incluyendo su alta superficie específica y porosidad, para la adsorción gaseosa [11].
La eficacia del filtro se evalúa a partir de la medida de la cantidad de CO2 adsorbido y su capacidad para mantener la estabilidad del sistema. Los resultados obtenidos pueden contribuir al desarrollo de estrategias para reducir las emisiones de GEI.
Influencia del agua residual doméstica en el crecimiento de epipremnum aureum (potus) dentro de un humedal experimental subsuperficial
Authors: Cárdenas Córdova María Elena , De los Santos Noemi Méndez , Antonio Cruz Rocío del Carmen , Romellón Cerino Mario José , Purata Pérez Nora Alicia
Published: November 2024

Este artículo surge con el propósito de contribuir a las metas del ODS 6 (Agua limpia y saneamiento), de la Agenda 2030 establecido por las Naciones Unidas en el 2015; donde una de las metas es mejorar la cobertura de tratamiento de aguas residuales y mejorar la calidad de las fuentes superficiales. Es aquí donde los humedales artificiales, que son una tecnología asequible, por ser de bajo costo, fácil operación y mantenimiento, toman relevancia. Conformados por una celda de poca profundidad, material filtrante, vegetación y flora microbiana. La vegetación juega un papel importante dentro del humedal, ya que a través de sus raíces absorbe agua y nutrientes de las aguas residuales, contribuyendo en la eficiencia del tratamiento. Los humedales artificiales típicos utilizan vegetación macrófita de la región; aunque actualmente se implementa el uso de vegetación ornamental, algunos estudios revelan que estas poseen características de remoción y dan valor estético al lugar.
En este trabajo se estudió la eficiencia de Epipremnum aureum (Potus) como vegetación ornamental en un humedal artificial a escala piloto. Iniciando con la construcción de un humedal horizontal de flujo subsuperficial a escala piloto, el cual consta de una celda de 2.40 x 1.10 x 0.50 m, usando como medio filtrante grava triturada y de río. Se dividió la celda en dos partes (inicio y final), cada una de las partes con 20 plantas (5x4). Se midió altura, tallo y número de hojas; en el agua se determinaron parámetros básicos en el inicio y final.
Resultados preliminares indican que estadísticamente no hay diferencias significativas en cuanto al desarrollo de la vegetación sin importar la ubicación. En cuanto a los parámetros básicos, sí hay diferencia significativa para la CE, SDT y ORP.
Método de dimensionamiento AD-HOC para baterías de iones de litio en vehículos eléctricos considerando sus parámetros mecánicos y un perfil de conducción
Authors: Domínguez Zenteno Joaquín , López Pérez Manuel de Jesús , López Estrada Francisco Ronay , Gómez Peñate Samuel , Valencia Palomo Guillermo
Published: November 2024

En este trabajo de investigación se propone un método de dimensionamiento “Ad-Hoc” para baterías de iones de litio (Li-Ion) para vehículos eléctricos. El método considera los parámetros mecánicos del vehículo, así como el perfil de conducción del mismo para cumplir un desempeño esperado por éste. Se desarrolló una herramienta en MATLAB para la estimación del requerimiento de potencia y de energía para el vehículo eléctrico (VE) que permite especificar la capacidad del motor eléctrico y dimensionar el banco de baterías para cumplir una autonomía especifica del mismo. Por lo que, los resultados de esta investigación pueden servir de guía para la especificación de componentes electromecánicos del vehículo eléctrico, así como el tamaño final
En este trabajo de investigación se propone un método de dimensionamiento “Ad-Hoc” para baterías de iones de litio (Li-Ion) para vehículos eléctricos. El método considera los parámetros mecánicos del vehículo, así como el perfil de conducción del mismo para cumplir un desempeño esperado por éste. Se desarrolló una herramienta en MATLAB para la estimación del requerimiento de potencia y de energía para el vehículo eléctrico (VE) que permite especificar la capacidad del motor eléctrico y dimensionar el banco de baterías para cumplir una autonomía específica del mismo. Por lo que, los resultados de esta investigación pueden servir de guía para la especificación de componentes electromecánicos del vehículo eléctrico, así como el tamaño final del banco de baterías, para que éstas entreguen la energía requerida de acuerdo al desempeño esperado del vehículo seleccionado y su perfil de conducción.
del banco de baterías, para que éstas entreguen la energía requerida de acuerdo al desempeño esperado del vehículo seleccionado y su perfil de conducción.
Evaluación de los parámetros para la calidad del agua en el cultivo de tilapia
Authors: López Acopa Nelson de Jesús , Antonio Cruz Rocío del Carmen , Méndez de los Santos Noemí , Jesús de la Cruz Kristal de María , Romellón Cerino Mario José
Published: November 2024

La presente investigación tiene como objetivo determinar la eficiencia de un filtro elaborado con materiales de fácil acceso y de bajo costo económico, que brinden la oportunidad a pequeños acuicultores de reducir el impacto ambiental de su actividad en materia del cuidado del agua. Esto se logra mediante la instalación de un sistema de recirculación cerrado, en el cual el agua es filtrada y tratada con fibra de coco y concha de ostión. Se evalúa la eficiencia de remoción de los filtros de contaminantes básicos en el efluente, mediante la evaluación de parámetros de calidad del agua como el potencial de Hidrógeno (pH), Temperatura (°C), Sólidos Suspendidos Totales (SST) y Oxígeno Disuelto (OD), para determinar si es factible su reingreso al sistema de cultivo de tilapia.
Hasta el momento, los resultados obtenidos nos hacen pensar que la respuesta de los medios filtrantes en el sistema es buena, aunque no se da por sentado nada aún, debido a que se continúa con la experimentación.
La importancia de esta investigación recae en el cada vez más grande crecimiento de la acuicultura a nivel nacional y mundial, donde se requieren grandes volúmenes de agua para su desarrollo y no se les da un tratamiento antes de reincorporarla a los cuerpos de agua. Por lo que reducir el consumo de la misma será un logro importante para acercar a la actividad acuícola a la sustentabilidad en materia del vital líquido.
Conservación y manejo integral de las microcuencas mediante la planificación y participación comunitaria
Authors: Leguizamo Hernández Miriam , Mora Castañeda Emanuel , Luna González Guillermo Melardo , Díaz Merchant Guadalupe Aney , Barron Sevilla Juan Antonio
Published: November 2024

Las cuencas hidrológicas y los ecosistemas conformados en ellas, son esenciales en la protección y equilibrio ecológico. La microcuenca del río San Pedro se encuentra ubicada en la comunidad de La Gloria Primera sección en Chignahuapan Puebla. El objetivo de esta investigación es evaluar el estado actual de la microcuenca del río San Pedro para implementar un manejo integral de recursos naturales mediante las metodologías Participación Comunitaria y Manejo de Cuencas Hidrográficas. Se realizó el Ordenamiento Territorial comunitario con propuestas de uso y distribución de suelo. Se detectó que los principales contaminantes son la basura y aguas residuales que se vierten en zonas de recarga de la microcuenca o en el río. Los terrenos de cultivo que conforman la microcuenca son tratados con herbicidas, plaguicidas y fertilizantes químicos. Estas comprobaciones indican que hay un grado de contaminación en los cuerpos de agua y modificaciones del hábitat de flora y fauna. Se capacitó a los lugareños para realizar compostas. Se hicieron estudios de suelo y agua; para el suelo se recomienda la aplicación de materia orgánica y yeso agrícola para modificar el pH según los requerimientos nutricionales del cultivo. El agua es de buena calidad, pero con exceso de Mn (Manganeso) y Fe (Hierro); se recomienda instalar filtros. Se construyeron dos biofiltros domiciliarios y un módulo de lombricomposta. Se implementó el monitoreo BIOCOMUNI que permitió identificar tres familias del estrato arbóreo, ocho del arbustivo, trece de aves, cinco de mamíferos, una de anfibios y cuatro de reptiles. Se instruyó a los pobladores en la germinación de especies forestales con semillas (20,000) de Pino prieto (Pinus greggii). Se experimentó germinando Sabino (Júniperos deppeanea) en cuatro sustratos; cada uno con 1485 semillas para determinar el mejor. Se monitoreó 980 árboles en cuatro sustratos para determinar la curva de crecimiento.
Relación incremental de costo-efectividad de la revascularización miocárdica con y sin circulación extracorpórea en una institución de salud colombiana
Authors: Charry plazas Andrés Mauricio , Cabezas Robayo Rosendo , Bernal Salamanca Marilyn Paola , Silva Mónica , Cogua Sánchez Ingry Loraine
Published: November 2024

Antecedentes: la enfermedad cardiovascular es una de las principales causas de morbilidad y mortalidad a nivel mundial, en la cual la revascularización coronaria, con y sin circulación extracorpórea, constituye una opción quirúrgica clave.
Objetivo: estimar la relación de costo-efectividad de ambas técnicas en una institución de salud colombiana.
Métodos: se realizó un estudio descriptivo y transversal de una cohorte retrospectiva, empleando la fórmula de relación incremental de costo-efectividad, con la mortalidad a 30 días como medida de efectividad.
Resultados: la revascularización miocárdica sin circulación extracorpórea presentó una incidencia de complicaciones del 3,4 %, en comparación con el 5 % asociado a la técnica con circulación extracorpórea, lo que sugiere una mayor efectividad de la primera técnica y una diferencia leve en los costos.
Conclusiones: la razón de costo-efectividad incremental (RCEI) indica que, por cada 1 % de reducción en las complicaciones logrado mediante revascularización miocárdica sin bomba, se obtendría un ahorro de $1,285,591 COP.
Le dilemme d’Agamemnon face au sacrifice dans Iphigénie à Aulis d’Euripide
Authors: DIOUF Dr Bouré , FAYE Dr Louise
Published: November 2024

Abstract. Serving his people and satisfying the divinity: that was
Agamemnon's weighty mission. In ancient Greece, it was the moral duty of
all mortals to submit to divine power, and to use their power to unite mankind
with the gods. Euripides seized the opportunity to reveal the psychotraumatic
dimension of this duty through theatrical means
Constantin et Théodose, deux empereurs favorables à la cause du christianisme : entre volonté religieuse et soubassement politique
Authors: MBENGUE Dr Pierre Edmond
Published: November 2024

Abstract. In the history of the Roman Empire, Constantine and Theodosius
were the emperors who distinguished themselves the most for the cause of
Christianity. This is fully proved, on the one hand, by their religious policy,
whose actions were aimed at restoring Christianity to its dignity, and on the
other hand, by their intervention in the affairs of the Church, at a time when
unity within Christianity was weakened by clerical tensions. However, the
interference of these two emperors in ecclesiastical affairs seems to have been
based on political opportunism. For, this interference certainly worked in
favour of a religious unity of the Empire around Christianity, but in return
allowed them not only to gain credibility, but also to increase their
supremacy. Let us say, in short, that the temporal uses the spiritual to better
establish its power.
La navigation dans les romans de Tristan au Moyen-Âge
Authors: KANE Dr Maïmouna
Published: November 2024

Abstract. In this article we propose to study navigation in the novels of
Tristan in verse and prose to try to have a precise idea of the practice of
navigation in the Middle Ages. To do this, we devoted the first part of our
study to the place given to the sailors who are involved in the crossing. They
direct the ships according to the weather, in the face of which they often find
themselves quite helpless with prayer as their only weapon. During bad
weather they invoke God and the saints to get out of trouble. Their condition
is very unenviable so much so that for a long they did not appear in the
journals of states of the world. The second part of this study is devoted to the
conditions of the crossing and the third part to the description of the crossing.
We find elliptical formulas which refer to the crossings in Le roman de
Tristan en prose while the texts of Thomas and Folies Tristan bespeak of a
more in -depth knowledge of the fact of navigation. These texts written in
Anglo-Norman are very rich from the standpoint of the vocabulary used to
describe navigation, vocabulary on which we also dwell in our third part.
Effectiveness of Mindfulness Training on Sleep Problems and Depression in Adolescents
Authors: Chitsaz Mahdi , Ahmadi Ezzatollah , Bafandeh Qaramaleki Hassan
Published: November 2024

Objective: The present study aimed to determine the effectiveness of mindfulness-based intervention on sleep problems and depression in adolescents.

Methods and Materials: This research was a quasi-experimental study with a pre-test and post-test design, along with a control group. The statistical population included all high school students with sleep problems in the city of Azarshahr during the 2023-2024 academic year. A sample of 30 individuals was selected using the Depression Anxiety Stress Scales (DASS) by Lovibond and Lovibond (1995) and the Insomnia Severity Index (ISI) by Morin (1993) through purposive sampling methods. They were randomly assigned to experimental and control groups. Data analysis was conducted using covariance analysis in SPSS version 25.

Results: Data analysis revealed that the mindfulness-based intervention resulted in a significant difference between the groups in terms of depression (0.71) and insomnia problems (0.55) (p < .05).

Conclusion: According to the findings, it can be suggested that mindfulness-based intervention reduces depression and sleep problems.
KGB Activity against the Residents of Lithuania who Fled and Departed in the Sixth–Ninth Decade of the 20th Century
Authors: Juodis Darius
Published: November 2024

The residents of Soviet Lithuania attempted in different ways to flee to the West. Most often they preferred escaping by sea (sailors) or separated from a tourist group when being abroad. Some made efforts to go to live in the West by obtaining permission from Soviet institutions.
The Soviet penal codes attributed fleeing abroad to the grave crime against the state; the severest penalties were imposed for it. Until the beginning of the seventh decade, all refugees in their absence were sentenced to the death penalty by shooting. Later penalties were mitigated, in the same decade the practice of organizing the court processes in absentia was rejected. The criminal case just would be initiated and investigation would be conducted. The rehabilitation of the convicted and dismissal of the cases was started only at the end of the ninth decade.
KGB persecuted the relatives and acquaintances of the persons who fled abroad, interrogated them, made searches in their homes, and controlled their correspondence.
Soviet security planned and effected discrediting actions seeking to compromise refugees or departees abroad in the eyes of Lithuanian йmigrй or Lithuanian population. Disinformation was spread among the йmigrй about the supposed collaboration of those persons with KGB, reports were provided about their imaginary moral degradation. More serious results were not achieved in this field.
KGB collected information on new refugees, who were disappointed with the life as emigrants. Taking advantage of their frustration moods, efforts were made to return them back to Lithuania. Within that period, just one refugee returned, but the role of Soviet security in this story is not quite clear.