bluuebunny/crossref_metadata_2025 huggingface dataset:
STUDI PENYEDIAAN AIR BERSIH DI DESA SULAMU MENGGUNAKAN TEKNOLOGI PHOTOVOLTAIC- SEA WATER REVERSE OSMOSIS
Authors: S Arbye , Aziizudin Achmad , Purnomo Agung , Yogiswara Cahyo Wibi , Halim Dimas Ardiansyah , Putra Setya Drana Harry
Published: January 2025

Kekurangan air bersih diprediksi akan menjadi ancaman serius bagi Indonesia di masa mendatang, khususnya di daerah dengan curah hujan rendah, serta kawasan pesisir yang memiliki sumber daya air tawar terbatas. Penelitian ini mengkaji penyediaan air bersih melalui teknologi desalinasi air laut di Desa Sulamu, Kupang, Nusa Tenggara Timur, hingga tahun 2032. Teknologi yang digunakan adalah desalinasi air laut berbasis Photovoltaic (PV) yang menggerakkan sistem Sea Water Reverse Osmosis (SWRO). Teknologi ini diajukan sebagai solusi berkelanjutan untuk memenuhi kebutuhan air bersih di wilayah tersebut. Penelitian ini mencakup analisis kebutuhan air yang disesuaikan dengan proyeksi pertumbuhan penduduk dan estimasi konsumsi energi dari sistem PV-SWRO. Metode yang digunakan untuk memproyeksi jumlah penduduk sampai dengan tahun 2032 adalah geometrik, dengan hasil estimasi penduduk berkisar 8.210 jiwa, maka kebutuhan air bersih mencapai 215.769 m³/tahun, dan konsumsi energinya antara 496 hingga 1.554 MWh/tahun. Dengan potensi energi matahari yang melimpah di Desa Sulamu, diharapkan teknologi ini dapat memberikan jaminan pasokan air bersih yang stabil dan ramah lingkungan. Data estimasi perhitungan kebutuhan air dan energi diharapkan dapat menjadi acuan bagi para pemangku kepentingan dalam merancang strategi yang mendukung keberlanjutan program desalinasi berbasis energi terbarukan kedepannya.
Application of Autoregressive Integrated Moving Average (ARIMA) for Forecasting Inflation Rate in Indonesia
Authors: Saputra Jova Edri , Febrianti Werry
Published: January 2025

Inflation is one of the indicators to maintain economic stability. Controlling inflation reflects the success of economic growth, while very high or volatile inflation can lead to economic instability. The purpose of this research is to forecast the time series data of inflation rate in Indonesia until the end of 2024 using ARIMA method. The data used in this study are secondary data of monthly inflation rates in Indonesia from January 2003 to May 2024 obtained from the Bank Indonesia website. Based on the research results, the optimal model for forecasting the inflation rate in Indonesia until the end of 2024 is ARIMA (1,0,1) with a MAPE of 6.91%. The forecasting results show a stable and not too significant increase and are still within the target range set by Bank Indonesia and the Government, which is between 1,5% and 3,5% for 2024.
Simulation Modeling Incomplete Treatment Impact on Tuberculosis Transmission
Authors: Muniroh Muna Afdi
Published: January 2025

Among the most common diseases globally is tuberculosis (TB). The spread dynamics of TB are formulated in the form of a mathematical model with five subpopulation densities, namely, susceptible individuals, latent individuals, TB active individuals, treated individuals, and recovered individuals. The existence of an equilibrium point is contingent upon the value of the basic reproduction number Ro. Ro  is a key metric for understanding the potential for disease transmission and is obtained from the next generation matrix. Stability analysis for TB models is investigated by determining the criteria for the local stability of equilibrium points. After that, a sensitivity analysis is conducted to identify TB model parameters that most affect Ro  value. The solution behavior of the TB model is shown by graphs generated numerically with the Runge-Kutta fourth-order method and Matlab software
Forecasting Dry Rubber Production in Indonesia for the Year 2022 Using Pegel's Exponential Smoothing Method with Modified Golden Section Optimization
Authors: Fitrah Rahmi Nurul Ainun , Sahriman Sitti
Published: January 2025

Pegel’s Exponential Smoothing is a forecasting method that considers separating trend and seasonal aspects, with additive and multiplicative models. Pegel’s Exponential Smoothing has three parameters, α, β, and γ. Many possible parameter combinations may yield an optimal solution, so a modified Golden Section method is used. The principle of this method is to iteratively reduce the boundary area of x that may produce an optimal objective function value, systematically decreasing the number of search steps to minimize the number of trials. Data obtained from the Central Bureau of Statistics regarding the amount of dry rubber production in Indonesian plantations from January 2017 to December 2022 is assumed to contain a multiplicative seasonal effect due to the relatively unstable seasonal pattern heights. This study compares three trend models: no trend, additive trend, and multiplicative trend in the multiplicative seasonal Pegel’s Exponential Smoothing method. This study aims to predict the amount of dry rubber production in Indonesian plantations from January 2022 to December 2022. Forecast validation results show that the multiplicative trend in the multiplicative seasonal Pegel’s Exponential Smoothing method, with a MAPE of 3.389001% and an RMSE of 8,839.965080, has the best forecasting accuracy for this data compared to the other three trend models.
Minimum Variance Quadratic Unbiased Estimation Approach in Panel Data Regression Analysis with Two-Way Error Component Estimation Using Biggers Method
Authors: Arumtiwi Andi Atirah , Raupong Raupong , Siswanto Siswanto
Published: January 2025

Panel data that have missing observations can be known as incomplete panel data. The model used is a two-way error component. The missing data estimation used is the Biggers method. This study aims to model the incomplete panel data regression of two-way error components on Manufacturing Company Stock Return data. The method used for estimating the error variance component is Minimum Variance Quadratic Unbiased Estimation (MIVQUE) with parameter estimation using Maximum Likelihood (ML). The method was applied to IDX data for 10 companies from 2014-2021. The results obtained using the MIVQUE method are σ ̂_v^2= 0.1142, σ ̂_μ^2=-0.0107, and σ ̂_λ^2=0.0068, for the ML method produces β ̂_0=0.0304719 〖 β ̂〗_1= -0.021107, and β ̂_2=0.0087936. Based on these methods, if there is an increase in the Debt to Equity Ratio, there is a decrease in the value of stock returns, and vice versa for Net Profit Margin.
Modelling the Probability of River Water Pollution Using Geographically Weighted Logistic Regression Model (Case Study: River Water DO Data in East Kalimantan)
Authors: Miranda Adelia , Suyitno Suyitno , Fauziyah Meirinda
Published: January 2025

Geographically Weighted Logistic Regression (GWLR) is a local binary logistic regression model, and it’s applied to the spatial heterogeneity data. The parameter estimation of GWLR model in this study uses Maximum Likelihood Estimation (MLE) method, and it’s conducted at each observation location with spatial weighting. The spatial weight in this study was calculated using the adaptive tricube function. The spatial weighting function depends on distance between observation location and bandwidth, where the determination of optimal bandwidth uses the Akaike Information Criterion (AIC). The aim of this research is to identify the factors influencing the probability of river water pollution in East Kalimantan Province through GWLR modelling to Dissolved Oxygen (DO) data 2022, and to interpret it based on the best model. The research data is secondary data provided by Life Environment Department of East Kalimantan Province. Research concludes that the GWLR was fit model based on the results of similarity testing of the GWLR model and global model, as well as simultaneous parameter testing, with the model fitting measure was a McFadden R-Squared value of 61,1%, and an AIC value of 29,629. Based on partial parameter testing, local factors influencing chance of river water pollution in East Kalimantan can be identified, namely nitrate concentration and water color degree. Based on the GWLR modelling to DO data 2022, it can be interpreted that increasing nitrate concentration and water colour degree respectively will increase the probability of river water pollution
Spectral Characteristics of The Antiadjacency Matrix of Kite Graph
Authors: Camilla Miming Fikria , Rensiana Melza , Silaban Denny Riama
Published: January 2025

Let G=(V,E)  be a connected graph, where V is the set of vertices and E is the set of edges of G. The kite graph, denoted by Kiten,m, is a graph obtained by appending a complete graph Kn to a pendant vertex of path Pm. This research investigates the spectrum of antiadjacency matrix of kite graph. The antiadjacency matrix of a graph G of order n is a square matrix with order n where the entries of the matrix represent the nonadjacency of the vertices.
The application of ARIMA and Residual Bootstrap for Forecasting Dynamic Mortality in the PLAT Model for Indonesian Male Population
Authors: Widhiatmoko Fery , Danardono Danardono , Kurniawaty Mila , Maydika Amanda Nadhifa , Nishi Thessalonika Sandra Devina , Idris Chasib
Published: January 2025

The development of mortality tables in Indonesia so far has been based on static mortality tables, which only consider the probability of death by age, even though they are applied across different years. A dynamic analysis of mortality tables, which takes into account the observation year and the birth year of individuals, becomes important for mitigating risks, particularly in life insurance and pension fund applications. Numerous methods and models for determining stochastic mortality to form dynamic mortality tables exist, but in this study, the PLAT stochastic mortality model was used to establish dynamic mortality tables because it is suitable for all age ranges, captures cohort effects, aligns with historical data, has a non-trivial (yet not overly complex) correlation structure, does not have robustness issues, and can account for parameter risk, while maintaining a relatively simple model structure. From these mortality tables, future survival probabilities for the next several years were forecasted using the ARIMA method, and the forecast range was estimated using residual bootstrap. The forecasting results show values that do not differ significantly from Indonesia’s 2023 mortality table. Additionally, the width of the confidence intervals derived using residual bootstrap was larger than the intervals without using the residual bootstrap method, particularly for younger ages. This is significant for mortality research in pension planning, as they provide interval simulations that reflect various factors during the estimation process.
Rational approaches to the treatment of patients with overweight and obesity: a cardiologist’s view
Authors: Miklishanskaya S. V. , Mazur N. A.
Published: January 2025

The objective is to evaluate various interventions for obesity in terms of their impact on life expectancy and the development of cardiovascular complications. When determining the degree of cardiovascular risk in patients suffering from obesity, one should rely not only on body mass index (BMI), but also on other data, namely, the presence of visceral obesity, metabolic disorders and/or cardiovascular diseases, type 2 diabetes mellitus. The review assesses drug and non-drug treatments for obesity, as well as bariatric surgery. GLP-1 agonist drugs and bariatric surgery, despite a significant reduction in body weight, showed the least impact on life expectancy and the development of cardiovascular diseases and complications. Moreover, they are expensive to use and have side effects. Indications for bariatric surgery should be significantly limited. Bariatric surgery is most indicated for people with type 2 diabetes and/or cardiovascular diseases when they cannot be corrected with medication and non-medicinal means. Based on the available data, the Mediterranean diet, brisk walking, and metformin, despite a slower and more moderate weight loss, have the best effect on the prognosis in patients suffering from obesity. Metformin therapy should be added to the treatment of patients suffering from obesity in combination with metabolic disorders and cardiovascular diseases. In this case, one should not remain on the initial doses, but individually select doses depending on the patient’s BMI.
Myocardial infarction of the "forgotten chamber of the heart" — the right atrium: a clinical case
Authors: Kornev N. I. , Pereverzeva K. G. , Yakushin S. S. , Glukhovets I. B.
Published: January 2025

The incidence of atrial myocardial infarction (MI) varies widely, from 0.7 to 42%. This indicates that atrial MI is an overlooked rather than a rare pathology. Ischemic myocardial damage due to atherosclerotic lesions of the coronary vessels is characteristic of left atrial MI, which is often combined with left ventricular MI. In right atrial (RA) MI, the main pathogenesis link is RA overload, which occurs due to pulmonary hypertension. Isolated atrial MI is a poorly understood issue in modern cardiology; however, it may have independent clinical significance. However, there is no unified approach to pathogenesis, and there is no specific diagnostics or treatment. The article presents a clinical case of isolated RA MI (isolated necrosis of the right cardiac auricle) that developed as a result of a series of sequential events triggered by acute decompensation of chronic heart failure (CHF). The cause of this acute decompensation of CHF remains debatable. Probably, the leading contribution to CHF decompensation was made by a previous left ventricular MI with damage to the infarct-related right coronary artery basin, which causes RA involvement. Acute decompensation of CHF led to the development of deep vein thrombosis of the lower extremities. Pulmonary embolism developed as a result of deep vein thrombosis of the lower extremities and caused pulmonary hypertension, which in turn served as the basis for the development of RA MI. Due to the small thickness of the atrial wall, acute ischemic damage to the RA in this clinical case led to myomalacia and perforation of the RA wall. Due to the complexity of lifetime diagnosis of isolated atrial myocardial damage and scant clinical symptoms, this condition requires special attention and should be covered in order to develop generally accepted views on the management of patients with this pathology and to determine a list of effective treatment measures aimed at saving the patient’s life.
An in-depth study of the association of breast arterial calcification with cardiovascular disease, its risk factors, and other chronic noncommunicable diseases: rationale and study protocol
Authors: Kim I. V. , Bochkareva E. V. , Butina E. K. , Molchanova O. V. , Bayramkulova N. Kh. , Filichkina E. M. , Yarovaya E. B. , Drapkina O. M.
Published: January 2025

Aim. To assess association between breast artery calcification (BAC) with ultrasound and biochemical markers of cardiovascular risk, asymptomatic and clinically expressed forms of cardiovascular diseases, as well as other chronic non-communicable diseases.

Material and methods. It is planned to include 300-400 women aged 40-74 years who underwent routine or diagnostic digital mammography at the National Medical Research Center for Therapy and Preventive Medicine and signed informed consent in a cross-sectional study. The groups will be formed on the case-control principle in a 1:1 ratio, considering age. The study protocol will include: physical examination; questionnaire to assess sociodemographic parameters, reproductive history, cardiovascular risk factors, comorbidities and drug therapy, probability of angina pectoris, intermittent claudication, history of stroke, risk of osteoporotic fractures; laboratory examination to determine parameters of lipid, carbohydrate, mineral metabolism, renal function, thyroid gland and presence of anemia; electrocardiography; duplex scanning of carotid and femoral arteries. Mammograms will be evaluated in a blinded manner by radiologists. Standard digital mammograms in craniocaudal and mediolateral projections will be analyzed. The severity of BAC will be determined using a 12-point scale.

Expected results. The data on the presence/absence of BAC and its severity will be compared with the ultrasound parameters of the atherosclerotic load of the peripheral arteries, which is a recognized marker of high cardiovascular risk, as well as traditional risk factors for cardiovascular diseases. The relationship of BAC with iron deficiency anemia, decreased bone mineral density, thyroid diseases, decreased glomerular filtration and other pathological conditions will be studied, which, according to previous studies conducted at the National Medical Research Center for Therapy and Preventive Medicine on a limited sample, can presumably be associated with the presence of BAC.

Conclusion. For Russian healthcare, the development of a methodology for assessing the probability of cardiovascular diseases as a part of a mammographic screening programs is an urgent task, but there are only a few domestic studies on the role of BAC as a marker of cardiovascular risk among women. If the hypothesis about the association between BAC and atheromatosis of the carotid and femoral arteries and other pathological conditions is confirmed, new opportunities will open up for the development and implementation of large-scale screening of cardiovascular diseases among the female population of Russia.
Analisis Keefektifan Lingkungan Pembelajaran Kimia Berbasis Web Pada Mahasiswa Pendidikan Kimia
Authors: Lisdiana Hayyun , Suryani Elma , Selvia Nurrohmah Adilla , Apriliani Layla , Saputra Rizky
Published: January 2025

This study aims to obtain information regarding the effectiveness of a web-based chemistry learning environment for students in semester 6 of the 2023/2024 academic year. Web-based learning in this study is using online learning. The research method uses a mixed method. The subjects in this study were 43 students of Chemistry Education, Jakarta State University, class of 2020. This research consists of three stages, namely the initial stage, the implementation stage, and the final stage. The data collection method used consisted of a questionnaire method with open ended questions. The questionnaire in this study used the Web Based Learning Environment Instrument (WEBLEI) with a Cronbach's alpha reliability value of 0.878. The results showed that the effectiveness of the web-based learning environment was quite good, which was indicated by the average acquisition of each scale, namely 3.65, 3.41, 3.59 and 3.44 for the access, interaction, response and outcome scales.
Analisis Miskonsepsi Pada Materi Kesetimbangan dalam Asam Basa dan Hidrolisis Garam
Authors: Asep Hidayat Amin Muhamad , Asworo Yuliana Dwi , Rahmawati Yuli , Irwanto
Published: January 2025

This study aims to analyze students' misconceptions about acid-base equilibrium and salt hydrolysis using instruments from [1]. This research is descriptive-quantitative, and the subjects of this study were students of classes XI and XII MIPA at one of the State Madrasah Aliyah in west Jakarta in the 2022/2023 school year. Data was collected using the two-tier multiple-choice web-based misconception diagnostic test. Based on the results of the study, it was found that in class XI, there were 80% of students who did not understand and 15% of students had the wrong concept on acid-base material, while in class XII, 72% did not understand and 24% of students had the wrong concept on acid-base material. The answers with the most misconceptions were found in acid-base question number 4, where 76% of students cannot choose which, ionic group can be together with a solution that is at room temperature under conditions of H+ ion concentration in a solution ionized by water of 1 x 10–13 mol/L and the reason for the proper explanation. Students tend to only understand what acid-base or hydrolysis salts are without strengthening their deeper concepts.
Pengembangan Modul Elektronik Berbasis Pendekatan Saintifik pada Materi Tata Nama Senyawa dan Persamaan Reaksi Kimia
Authors: Allanas Edith
Published: January 2025

Penelitian ini bertujuan untuk mengembangkan media pembelajaran kimia berupa modul elektornik berbasis pendekatan saintifik pada materi tata nama senyawa dan persamaan reaksi kimia kelas X. Metode penelitian yang digunakan adalah penelitian dan pengembangan (Research and Development) dengan model penelitian ADDIE yang meliputi tahap analisis (Analyze), tahap perancangan produk (Design), pengembangan produk (Develop), implementasi produk (Implement), dan evaluasi akhir pada produk (Evaluate). Rancangan kegiatan pembelajaran pada modul elektronik disusun secara sistematis dan menerapkan langkah-langkah pendekatan saintifik. Hasil validasi oleh ahli materi, ahli bahasa, dan ahli media menunjukkan hasil sangat baik, yaitu dengan nilai r sebesar 0,67; 0,72; dan 0,67. Pada tahap akhir, hasil uji coba produk oleh peserta didik dan guru juga menunjukkan hasil yang sangat baik dengan rata-rata presentase skor 90,3% dan 95,4%. Berdasarkan hasil yang diperoleh, dapat disimpulkan bahwa modul pembelajaran berbasis pendekatan saintifik pada materi tata nama senyawa dan persamaan reaksi kimia yang dikembangkan memperoleh interpretasi sangat baik dan layak untuk digunakan dalam kegiatan pembelajaran kimia.
Multidimensional Approach for Predicting 30-Day Mortality in Patients with a Hip Fracture
Authors: de Jong Louis , de Haan Eveline , van Rijckevorsel Veronique A.J.I.M. , Kuijper T. Martijn , Roukema Gert R.
Published: January 2025

Background:

The aim of this study was to develop an accurate and clinically relevant prediction model for 30-day mortality following hip fracture surgery.

Methods:

A previous study protocol was utilized as a guideline for data collection and as the standard for the hip fracture treatment. Two prospective, detailed hip fracture databases of 2 different hospitals (hospital A, training cohort; hospital B, testing cohort) were utilized to obtain data. On the basis of the literature, the results of a univariable analysis, and expert opinion, 26 candidate predictors of 30-day mortality were selected. Subsequently, the training of the model, including variable selection, was performed on the training cohort (hospital A) with use of adaptive least absolute shrinkage and selection operator (LASSO) logistic regression. External validation was performed on the testing cohort (hospital B).

Results:

A total of 3,523 patients were analyzed, of whom 302 (8.6%) died within 30 days after surgery. After the LASSO analysis, 7 of the 26 variables were included in the prediction model: age, gender, an American Society of Anesthesiologists score of 4, dementia, albumin level, Katz Index of Independence in Activities of Daily Living total score, and residence in a nursing home. The area under the receiver operating characteristic curve of the prediction model was 0.789 in the training cohort and 0.775 in the testing cohort. The calibration curve showed good consistency between observed and predicted 30-day mortality.

Conclusions:

The Rotterdam Hip Fracture Mortality Prediction-30 Days (RHMP-30) was developed and externally validated, and showed adequate performance in predicting 30-day mortality following hip fracture surgery. The RHMP-30 will be helpful for shared decision-making with patients regarding hip fracture treatment.

Level of Evidence:

Prognostic Level II. See Instructions for Authors for a complete description of levels of evidence.
PENGARUH VARIASI CaCo3 TERHADAP ARANG AKTIF PADA PROSES PACK CARBURIZING TERHADAP PENINGKATAN KEKERASAN BAJA KARBON RENDAH DITINJAU DARI STRUKTUR MIKRO DAN KEKERASAN
Authors: Hafni Hafni
Published: January 2025

Karena sifatnya yang lunak, liat dan mudah dibuat, baja banyak digunakan sebagai bahan dalam pembuatan suatu produk.  Untuk mendapatkan sifat yang keras pada permukaan dan tetap lunak pada intinya maka dilakukan proses pengerasan permukaan (face hardening), sehingga produk tersebut dapat difungsikan sesusai dengan tujuan desainnya. Salah satu cara untuk melakukan pengerasan permukaan ini adalah dengan media carbon padat atau pack carburizing. Untuk melakukan proses carburizing ini, diperlukan sebuah tungku pembakar yang dirancang tahan panas serta mudah dioperasikan. aman dengan bahan bakar batu bara. untuk penguji tungku yang telah dirancang dilakukan pengujian pada baja rabon rendah dengan mengunakan media karburisasi 1000 gr arang aktif dengan variasi:  200 gram, 100 grm, 66.7-gram Kalsium karbonat (CaCo3) pada temperatur   pemanasan 950 0C dan waktu tahan 4 jam   Kemudian dilanjukan dengan proses quenching. Dari hasil pengujian menunjukan bahan uji dengan komposisi 1000 gr arang aktif dengan 200-gram calcium carbonat lebih baik penambahan unsur karbon sehingga waktu dilakukan quenching terbentuk struktur mikro martensite.
Valoración económica de la captura de carbono en sistemas agroforestales en La Merced, Chanchamayo, Junín
Authors:   , Valderrama Real Violeta Maritza
Published: January 2025

"El presente estudio se realizó con el objetivo de (a) estimar la contribución de los sistemas agroforestales (SAF) de café (Coffea arabica) en la captura de carbono en comparación a los monocultivos y (b) estimar el valor económico de la captura de carbono, con la finalidad que incremente los ingresos generados por la producción de SAF de café en la microcuenca del río Toro, ubicado en Chanchamayo, La Merced.
Se realizaron evaluaciones de campo en 15 parcelas de SAF de café y 17 parcelas de monocultivos. Cada parcela tenía unas dimensiones de 50 x 20 m, y se establecieron al azar tres subparcelas de 10 x 10 m en su interior. En cada parcela se midió la altura de los árboles con diámetro a la altura del pecho (DAP) superior a 30 cm, mientras que en las subparcelas se midieron los árboles con DAP igual o superior a 5 cm y menor a 30 cm, incluyendo tanto los cultivos de café como los monocultivos.

La biomasa aérea se estimó mediante un método no destructivo utilizando ecuaciones alométricas, y posteriormente se calculó la captura de carbono en SAF de café y monocultivos (equivalente al 50% de la biomasa determinada). Además, los valores de captura de carbono obtenidos en las 15 parcelas de SAF de café se utilizaron como referencia para estimar el almacenamiento de carbono en 60 parcelas adicionales de SAF de café no evaluadas directamente en el campo. Finalmente, se determinó que, en promedio, los SAF de café almacenan 62.67 tC/ha, mientras que los monocultivos almacenan 6.25 tC/ha.
Para valorar económicamente el carbono almacenado en SAF de café, se utilizó el costo de oportunidad (CO), calculado a partir de la información sobre rentabilidad obtenida de encuestas a caficultores."
Injerto gingival desepitelizado versus injerto de tejido conectivo subepitelial en el tratamiento de las recesiones gingivales: una revisión sistemática
Authors:   , Ignacio Tejedo Joyce Rebeca , Cruzado Jara Rebeca Alexandra
Published: January 2025

Objetivo: Esta revisión sistemática (RS) evaluó el efecto del injerto gingival libre desepitelizado (IGLD) en comparación con el injerto de tejido conectivo subepitelial (ITCS) para el tratamiento de la recesión gingival (RG) clase I y II de Miller o tipo I de Cairo. Métodos: Una búsqueda en cinco bases de datos fue realizada hasta junio de 2024 para incluir ensayos clínicos aleatorizados (ECAs) que compararan los efectos clínicos del IGLD con el ITCS en el tratamiento de la RG. Un modelo de efectos aleatorios de diferencias de medias fue utilizado para determinar la reducción de la RG, la ganancia en el ancho del tejido queratinizado (ATQ), la ganancia en la espesura gingival (EG), la ganancia en el nivel de inserción clínica (NIC) y la reducción de la profundidad al sondaje (PS). La razón de riesgo a los 6 y 12 meses fue empleada para el recubrimiento radicular completo (RRC). Resultados: En esta RS se incluyeron cinco ECAs que representaron 183 y 111 RG a los 6 y 12 meses. El metaanálisis no mostró diferencias estadísticamente significativas en la reducción de la RG, ganancia de ATQ, ganancia de EG, RRC, ganancia del NIC y reducción de PS entre los grupos a los 6 y 12 meses. Conclusiones: El IGLD mostró resultados clínicos similares al ITCS en el tratamiento de la RG a los 12 meses.
Relevancia de los antecedentes de sobrepeso u obesidad y la disfuncionalidad familiar en el desarrollo de trastornos de conducta alimentaria en adolescentes atendidos en el Instituto Nacional de Salud del Niño de Breña, Lima - Perú
Authors:   , Bernal Vargas Sthephany Collene , Castillo Alvarez Flavia Isabel
Published: January 2025

Introducción: Los Trastornos de Conducta Alimentaria (TCA) son enfermedades psiquiátricas que alteran la alimentación, dividiéndose principalmente en Anorexia Nerviosa (AN) y Bulimia Nerviosa (BN). Aproximadamente el 22% de los niños y adolescentes presentaban trastornos alimentarios en 16 países a nivel mundial. La relación entre el funcionamiento familiar, el antecedente de sobrepeso u obesidad, y los TCA son múltiples, estudios anteriores sugieren que comparten factores biológicos, ambientales y sociales. Objetivo: Determinar la relevancia de los antecedentes de sobrepeso u obesidad y la disfuncionalidad familiar en el desarrollo de TCA en adolescentes que se atienden en el servicio de Medicina Adolescente en el Instituto Nacional de Salud del Niño. Métodos: Estudio de diseño observacional de corte transversal descriptivo y prospectivo, realizado en adolescentes con TCA. Se solicitaron las historias clínicas para recabar sus datos, el diagnóstico de TCA y corroborar si habían tenido antecedente de sobrepeso u obesidad. Posteriormente, se aplicó un cuestionario de manera virtual mediante Google Forms para conocer el tipo de funcionalidad familiar de cada participante. Resultados: Se analizaron un total de 105 participantes, de los cuales el 72,4% presentaron antecedentes de sobrepeso u obesidad, mientras que las familias disfuncionales fueron mayoritarias con un 79%. En ambas variables no se halló una relación significativa. Además, el 83,1% de los adolescentes pertenecientes a una familia disfuncional tuvieron anorexia, mientras que el 78,9% de adolescentes que vienen de una familia moderadamente disfuncional padecieron bulimia. Así mismo, se encontró que del total que presentó el antecedente de sobrepeso u obesidad, el 82,9% padecieron anorexia. Conclusión: No se encontró relación entre las variables de antecedente de sobrepeso u obesidad y funcionalidad familiar en el desarrollo de TCA en los adolescentes atendidos en el Instituto Nacional de Salud del Niño de Breña.
Estrés laboral y productividad en una empresa de transporte (Lima-Perú), 2023
Authors:   , Peralta Bajalque Gloria Maria Stefany , Torres Amasifuen Gaby Gendith , Gomez Arguelles Elizabeth Yesenia
Published: January 2025

En el contexto laboral actual, la relación entre el estrés y la productividad se ha consolidado como un factor de atención crítico para las organizaciones. En ese sentido, el objetivo de este estudio fue determinar si el estrés laboral se encuentra relacionado con la productividad en el área de Recursos Humanos de una empresa de Transporte ubicada en Lima, Perú, durante el año 2023. La muestra estuvo compuesta por 45 colaboradores. Asimismo, se adoptó un enfoque cuantitativo, de nivel básico, utilizando un diseño correlacional descriptivo. Los instrumentos empleados fueron dos cuestionarios, uno de 9 ítems y otro de 11 ítems, correspondientes a las variables en estudio. Las características de los ítems fueron evaluadas mediante la escala de Likert y sometidas a una prueba de fiabilidad, obteniendo un Alfa de 0,85 para el primer instrumento y un Alfa de 0,86 para el segundo, ambos categorizados como buenos. Los resultados indicaron un coeficiente de correlación y significancia de (r = -0,459; α = 0,002 < 0,05) para la hipótesis general. En conclusión, existe una relación inversa y significativa entre la variable 1 (Estrés laboral) y la variable 2 (Productividad), siendo el nivel de correlación obtenido moderado.
Evaluación del potencial reproductivo de Gracilariopsis lemaneiformis (Gracilariales: Rhodophyta) en San Andrés, Pisco
Authors:   , Chung Velasquez Sofia Cielo
Published: January 2025

Gracilariopsis lemaneiformis “pelillo” es un alga roja de importancia reconocida a nivel mundial por proveer una amplia variedad de servicios. El objetivo de este trabajo es evaluar el potencial reproductivo (PR) de individuos de la especie extraídos en la playa San Andrés, Pisco-Perú a través de la técnica de liberación de esporas; para ello, se tomaron muestras de la especie en zonas alejadas de la orilla (A, B y C) y se evaluó la liberación de esporas en condiciones de laboratorio. Los resultados de este estudio indican que las condiciones de orilla serían propicias para la madurez de estructuras reproductivas y liberación de esporas en esta especie, condicionadas por los parámetros físico-químicos del agua, resaltando la temperatura y salinidad. Se contabilizó en promedio 274.91± 1.52 cistocarpos g-1, 137 359.78 ± 2546.17 esporas g-1, y un potencial reproductivo de 154 097.94 esporas g-1. Se propone llevar a cabo más investigación que pueda complementar este trabajo para proponer planes de manejo.
Predicción de las variables macroeconómicas y spread soberano América Latina en el comportamiento del spread soberano peruano: periodo 2002-2019
Authors:   , Domador Culquicondor Irina Viviana , Chavez Maricahua Andrea Maria
Published: January 2025

Este documento tiene como objetivo evaluar empíricamente qué variables predicen el comportamiento del Spread soberano para el caso peruano. El Spread soberano representa cuánto más sería el costo de endeudamiento de la economía peruana frente a una economía desarrollada. Para ello, se consideran variables macro fundamentales, de liquidez y solvencia; tales como la balanza comercial (%PBI), las reservas internacionales netas (%PBI) y la deuda pública(%PBI), respectivamente. Adicionalmente, se emplea una variable para predecir el efecto contagio al spread soberano peruano por pertenecer a la región de América Latina, la cual se mide a través del EMBIG de América Latina. Dicha investigación se estima con datos trimestrales del período 2002-2019, a partir de un modelo denominado Vector de Corrección de Errores (VECM), el cual permite analizar la relación de largo plazo y corto plazo de las variables involucradas.
Los resultados muestran que existe una relación de largo plazo 1 a 1 entre el Spread Soberano peruano y las reservas internacionales netas (%PBI) (es decir, con un vector de cointegración igual a [1, -1]). También ante desequilibrios de esta variable endógena, el EMBIG Perú se ajustará. No obstante, la balanza comercial (%PBI), EMBIG de América Latina y la deuda pública (%PBI) no predicen el comportamiento del EMBIG Perú.
Estimación de la población canina con propietario y sus características de manejo, sanitarias y demográficas en el distrito de Barranco en el año 2022
Authors:   , Echeandia Cornejo Cesar Augusto Tadeo
Published: January 2025

El objetivo de este estudio fue calcular la cantidad de perros con propietario y analizar sus características de manejo, así como los aspectos sanitarios y demográficos en el distrito de Barranco, Lima, Perú, durante el año 2022. La metodología se basó en la aplicación de encuestas a 713 viviendas, seleccionadas a través de un muestreo aleatorio estratificado por zonas. El objetivo fue identificar la cantidad de perros por hogar el número de habitantes por vivienda, así como recopilar información sobre la raza, edad, sexo, función del can, control sanitario, tipo de alimentación, hábitos durante los paseos y la esterilización de los perros. Se identificó una relación de 5.93 personas por cada perro. La estimación canina estimada fue de 5719. Del total de perros, el 61.71% (282 de 457) recibió desparasitación interna en los últimos seis meses, y el 87.75% (401 de 457) fue vacunado contra la rabia durante el año anterior. El 38.29% (175/457) de los canes fueron esterilizados. Estos resultados indican que la mayoría de los canes en Barranco reciben cuidados sanitarios básicos, aunque la tasa de esterilización es relativamente baja. Los datos recopilados deben considerarse en las gestiones municipales para optimizar las campañas de salud animal y promover la tenencia responsable del distrito.
Percepción estudiantil sobre el ABP: rendimiento académico y adquisición de competencias en escuelas de diseño y comunicaciones de institutos de Lima este, Perú, 2021
Authors:   , Quispe Gamvini Fernando
Published: January 2025

El sistema educativo de Perú ha apostado en los últimos años por las metodologías de aprendizaje activo. Dentro de ella, el Aprendizaje Basado en Problemas (ABP) ha experimentado un gran crecimiento y se viene aplicando de forma progresiva en la educación formal. Esta investigación, de enfoque cuantitativo, tuvo como objetivo conocer la percepción de 189 estudiantes pertenecientes a las escuelas de diseño y comunicaciones de tres institutos tecnológicos de Ate y San Juan de Lurigancho (Lima Este) respecto a la relación de la metodología ABP en su rendimiento académico y a la adquisición de competencias genéricas. Se empleó un cuestionario de 36 items medido por la escala de Likert de 5 puntos y los resultados indicaron una percepción positiva sobre la influencia del ABP en su rendimiento académico. También corroboran que han logrado obtener las competencias analizadas en esta investigación; dando principal importancia a la motivación para el autoaprendizaje, pensamiento crítico y creativo. Se recomienda propiciar los entornos de trabaja bajo la metodología ABP en más cursos de carreras de diseño y comunicaciones para impulsar el aprendizaje autónomo de sus alumnos.
Dynamic Multi-Layered Image Encryption scheme using User Driven Chaotic Sequences
Authors: Mathivanan P. , Ashwini K
Published: January 2025

The paper introduces a novel approach that leverages the unique characteristics of users' authenticated usernames to determine the sequence in which image blocks are encrypted. This methodology employs two key strategies: the utilization of four individual chaotic maps - Sin, Chebyshev, Logistic, and Gaussian - for encryption, and the encryption of image blocks using a novel 4D chaotic map. The process begins with the segmentation of an N×N×3 color image into its red, blue, and green components, each of size N×N. The image components are further subdivided into four arrays, each sized (4×4) × (N/4) × (N/4). Chaotic sequences generated via schemes 1 and 2 aid in the encryption of various image bands, serving as fundamental encryption keys that guide both confusion and diffusion processes. The proposed encryption systems, Scheme 1 and Scheme 2, were rigorously evaluated using extensive simulations and compared to a standard approach. Both methods outperformed against statistical analysis differential attacks, with NPCR and UACI values approaching ideal standards. Notably, Scheme 2, with the proposed 4D map, performed better than Scheme 1, especially with regard to UACI and NPCR. Furthermore, the systems had a large key space, making decryption impossible within an astronomical timeframe. Entropy and correlation analysis validation yielded values consistent with established techniques, whereas pixel distribution analyses confirmed homogeneity in horizontal, vertical, and diagonal directions. The research presents a new encryption approach that takes advantage of user-specific attributes and outperforms standard methods in terms of security and performance.
The impact of cognitive behavioral therapy (CBT) on compatibility dimensions, academic achievement, and smoking cessation
Authors: Alhabeis Feras Ali , Al-Natsheh Numan , Alkhawaldeh Omar Abdallah Issa , Al-Awamrah Abdelsalam Fahad , Baniyounes Mohammad Mahmoud , Aljaloudi Diya Ahmad , Alwani Wafa Ali Mahmoud
Published: January 2025

This study examines the efficacy of Cognitive Behavioural Therapy (CBT) in enhancing compatibility dimensions (personal and emotional, health and physical, family, and social), reducing smoking behaviour, and its indirect impact on academic achievement among university students. Employing a longitudinal, quasi-experimental design, the research engaged 39 students at Al-Isra University who underwent CBT sessions, with assessments conducted at four intervals: pre-treatment, immediately post-treatment, and at one- and three-month follow-ups. Findings reveal that CBT significantly improved compatibility dimensions across all categories, affirming its potential to ameliorate personal and emotional well-being, physical health, and social and family dynamics. Concurrently, a marked reduction in smoking behaviour was observed, highlighting CBT's efficacy in smoking cessation. Contrary to expectations, enhancements in compatibility dimensions did not translate into measurable changes in academic achievement within the study's timeframe, suggesting the complexity of factors influencing academic performance. These outcomes underscore the multifaceted benefits of CBT in fostering well-being among university students and advocate for the integration of holistic psychological interventions within student support services. However, the lack of a direct correlation between compatibility improvements and academic success calls for a broader approach to enhancing student performance, encompassing academic and institutional support mechanisms alongside psychological interventions. This research contributes to the understanding of CBT's broad-spectrum benefits, emphasizing the need for comprehensive support strategies that address the psychological, social, and academic dimensions of student life. Future studies are encouraged to explore the long-term effects of CBT on academic outcomes and to examine the interplay of contextual and institutional factors in students' academic success.
The emergence of prefabricated VIP toilet seats with covers: The implication for odour control and potential improvement
Authors: Obeng Panin Asirifua , Donkor Emmanuel Amponsah , Awere Eric , Oduro-Kwarteng Sampson , Awuah Esi , Obeng Peter Appiah
Published: January 2025

The ventilated improved pit (VIP) latrine is a cheaper and convenient alternative to water-borne sanitation for many households in developing countries. To mimic the water closet toilet, some users have introduced prefabricated ceramic seats with covers, which are known to disrupt the odour control mechanism of the latrine. The objective of this study was to quantitatively establish the extent to which the use of seats with covers affects the ventilation rate in the VIP latrine and to explore whether an innovative seat with a partially-screened cover could significantly minimise the effect of seat covering. The ventilation rates in experimental latrines with various modifications of superstructure and user interface designs were monitored with an air flow meter. The study revealed that seat covering could lead to >87% reduction in the ventilation rate and allow the generation of <50% of the minimum ventilation rate required to achieve odour-free conditions in an otherwise standard VIP latrine. The study also established that lining part of the seat cover with an insect screen could increase the ventilation rate by more than three times and could attain the minimum ventilation rate when combined with the conventionally recommended superstructure design.
Assessment of groundwater quality and suitability for drinking and irrigation using multivariate statistical analyses and GIS in Jhenaidah District, Bangladesh
Authors: Nahar Nazneen , Khatun Asma , Shaibur Molla Rahman , Hossain Mohammed Sadid , Khan Abu Shamim
Published: January 2025

This study explored the groundwater chemistry, groundwater suitability, and potential human health risks in the Jhenaidah district, Bangladesh. A total of 54 groundwater samples were collected from the study area, and a set of multivariate approaches were applied to achieve the study objectives. Study results show the concentration of HCO3−, Ca2+, As, Fe, and Mn exceeded Bangladesh drinking quality guidelines in 100, 98, 44, 28, and 63% samples, respectively. The groundwater quality index shows only 15% of samples are suitable for drinking purposes, whereas various irrigation water indices like EC, TH, %Na, SAR, PI, and MH show that these sources of water are suitable for irrigation. In the study area, groundwater is mainly Ca2+–Mg2+–HCO3− types, and rock–water interactions are dominating the mineralization process. The sequential order of major cations and major anions are Ca2+ > Mg2+ > Na+ > K+, and Cl− > HCO3− > SO42−, respectively. Multivariate analyses show that both geogenic and manmade sources regulate the groundwater quality. Arc-GIS inverse weighted method has been utilized to spatial interpolate the basic parameters. For the human health aspect, both adults and children have high carcinogenic and non-carcinogenic health risks.
Assessment of heavy metal pollution of surface water through multivariate analysis, HPI and GIS techniques
Authors: Arora Sameer , Saha Prasenjit , Shende Ashay Devidas
Published: January 2025

Presence of heavy metals in surface metals is the mounting concern in the world due rapid industrialization and modernization of society, and surface water is being utilized both as source and sink for water consumption and wastewater discharge, respectively. The chemometric method were applied on river for pre and post monsoon seasons to determine the potential heavy metals and development of heavy metal pollution index (HPI). The cluster and factor analysis were applied on thirteen heavy metals monitored over eleven locations for characterizing the highly correlating and potential, respectively heavy metals. The proliferation of health risks of heavy metals was determined through cluster analysis and GIS. The Fe and Mn found exceeding the permissible limits in river and drain samples for both the pre-monsoon and post-monsoon season, whereas other heavy metals were found within the permissible limits throughout the study period. The study suggested that classification of pollutants and assessment of associated risk to human health could provide a valuable insight for the development of remediation measures to minimize the degradation of public health and appropriate treatment technology for minimizing the contamination of water sources.
ANALISIS PENERAPAN COATING PADA BAJA ASTM A36 DENGAN VARIASI CAT TERHADAP LAJU KOROSI, KEKUATAN ADHESI DAN KETAHANAN IMPACT COATING
Authors: Budiarto Untung , Manik Parlindungan , Kusuma Ghiyats Abiyyu
Published: January 2025

Corrosion is the most common damage experienced by steel structures due to the interaction between a metal and a corrosive environment. One way to prevent corrosion of steel is coating. A good coating must have a low corrosion rate, high adhesion, and material resistance to impact. This study aimed to compare the corrosion rate, adhesion strength, and impact coating values of the different types of paint between epoxy, alkyd, and polyurethane on A36 steel. The type of steel used in this study is ASTM A36 steel. In this study, the type of coating paint used varied. The types of coatings used are epoxy, alkyd, and polyurethane. Aluminum oxide with a mesh size of 24 is used as an abrasive material. Testing the corrosion rate using the electrochemical method, the test used to determine the adhesive power value using the pull off test method, and to determine the coating resistance value using the impact test method. This type of polyurethane coating has the most optimal value between epoxy and alkyd with a corrosion rate value of 9.09×10-5mmpy, an adhesion value of 15.06 MPa, and an impact coating resistance of 4.70 Joules. Based on the results obtained in this study, the different types of coatings affect the value of corrosion rate, adhesion, and impact.