bluuebunny/crossref_metadata_2025 huggingface dataset:
Isolation and Identification of Fungi from Natural Fermentation of Guava Seeds
Authors: Darmasiwi Sari , Pahlevi Reza Dwi , Setiadi Chris Elian Beryl
Published: September 2024

Guava, a tropical fruit, is high in macro- and micronutrients. However, only 50% of the fruit’s parts are edible, while the peel and seeds are considered agro-industrial waste. Ruminants may benefit from the nutritional value of dehydrated guava seeds. Guava seeds processed by natural/spontaneous fermentation could boost amino acid content while also preventing antinutritional factors. However, more research is needed to determine the benefits and safety of using fermented guava seeds. The purpose of this study was to investigate fungi isolated from the natural/spontaneous fermentation of guava seeds. Guava seeds were fermented using sterile water and banana leaves, and incubated at 37 °C for 72 hours. Isolation was done on PDA medium for moulds and YMEA medium for yeast. The isolated fungi were characterized by their colony and cell morphology, as well as their physiological characteristics. Results showed that the yeasts from the genera Schizosaccharomyces, Pichia, and Cryptococcus were found to be primary microbes that play a role in the fermentation process, while the moulds from the Mucoraceae family are likely spoilage microbes that appear after the fermentation period.
Carbon Sequestration Assesment of Mangrove Ecosystem in Karang Anyar Village, Tanggamus Regency
Authors: Kusuma Anma Hari , Caesario Racmad , Lahay Almira Fardhani , Hasani Qadar , Jati Ciptaning Weargo , Sarida Munti , Siregar Amril Ma'ruf
Published: September 2024

Mangroves is a ecosystem can absorb carbon more efective than teresterial vegetataion. The goal of this research is to analyze effectively carbon absorption in the mangrove aea in the Karang Anyar Village. The research was conducted in Karang Anyar Village. Survey and tree sampling were carried out from Juni to August 2024.  Biomass measurements provided information on carbon sequestrtaion. Data obtained was analyzed using allometric equation. Results showed that mean carbon sequestration of the mangrove biomass in Karang Anyar Village was 40,45-69,24 kg C/m2. Carbon sink in mangrove sediment was 402,15-907,95 kg C/m2. This research showed that mangrove ecosystem in Karang Anyar Village held sufficiently high carbon stock. Nevertheless, the future study needs to be directed to carbon stock comparison with other locations in Lampung.
Improving the pH of Palm Oil Mill Effluent (POME) with Aerator Treatment and Water Dilution
Authors: Jaya Galang Indra , Gunawan Sri
Published: September 2024

Palm Oil Mill Effluent/POME is a by-product produced from the processing of fresh fruit bunches/FFB into crude palm oil/CPO. Aeration of POME is one of the processing methods that aims to reduce the levels of organic matter and pollutants. This study aims to determine the dynamics of POME pH with aeration treatment and dilution variations in order to speed up the waste treatment time.The method used in this research is to make the treatment of pure POME, POME & water in a ratio of 1:1 & 1:2. The process carried out in the study was to place the solution into a 1 liter bottle and given an air flow using an aerator with a discharge of 0.66 l/min. POME samples were taken every 24 hours for a span of 7 days. The pH was measured using the electrometric method. On day 2, it was found that the pH of the 1:1 treatment POME had reached pH 6, while the 1:2 treatment on day 3 and the pure POME only reached pH 6 on day 5. Aeration is an effective method to neutralize the acidity of POME. The increase in POME pH was fastest in the 1:2, 1:1 and finally pure POME dilutions. All treatments met the pH quality standard on day 5. Aeration can help improve the quality of POME so that it is more environmentally friendly.
Biodiversity Indices of Mangrove Community in Gili Sulat, East Lombok
Authors: Diniyatushoaliha Ainun , Al Idrus Agil , Bahri Syamsul
Published: September 2024

Mangrove ecosystems play an important role in supporting environmental stability, providing ecological services, and influencing the long-term survival of many living organisms. This research aims to analyse the biodiversity indices of mangrove community in Gili Sulat, East Lombok. The method for determining stations is based on purposive sampling. Each station has three plots. The method for determining plots is based on mangrove density (sparse, moderate, dense). Data were collected using plots of 10x10 m2 for trees, 5x5 m2 for saplings, and 2x2 m2 for seedlings. Diversity, richness, evenness, and dominance values were calculated using the Shannon-Weaver diversity index (H’), Margalef-Richness index (R), Pielou-Evenness index (E), and Simpson-Dominance index (D) to calculate. The results showed twelve mangrove species in tree, sapling, and seedling categories. The diversity index in three stations ranges from low to moderate, the richness index shows species richness of mangrove is low, the evenness index shows that mangrove species evenness ranges from low and high, the dominance index shows that mangrove species dominance range from low and high. Thus, these results present that biodiversity indices of mangrove community in Gili Sulat are: (1) the diversity index (1,73) presents that species diversity and ecolocigal pressure are moderate, (2) the richness index (1,78) presents that species richness is low, (3) the evenness index (0,70) presents that species evenness is moderate and ecosystem condition is less stable, (4) the dominance index (0,26) presents that species dominance is low and almost no species dominate.
Formulation of Tembelekan Leaf Hand Sanitizer (Lantana camara L.) and Antibacterial Activity Test Against Escherichia coli and Staphylococcus aureus
Authors: Fauzi Ziza Putri Aisyia , Putri Cut Intan Annisa , Aska Nawalul , Utami Dinda Sari
Published: September 2024

Disease-causing microorganisms stick to hands every day through physical contact with the environment. One of the easiest and most appropriate ways to clean them is to wash hands with soap and clean water. This study aims to determine the formulation of tembelekan leaf hand sanitizer (Lantana camara L.) and test its antibacterial activity against Escherichia coli and Staphylococcus aureus. Assessment of the arrangements acquired incorporates organoleptic tests with libertine tests, homogeneity, pH, spreadability, dependability, bothering to chip in skin, and antibacterial movement against Staphylococcus aureus and Escherichia coli by agar dispersion utilizing poke holes. The outcomes showed that the hand sanitizer readiness containing 10% tembelekan leaf remove was the best planning since it was liked by specialists, stable when put away at room temperature for a very long time, didn't cause bothering, and had solid antibacterial movement so that the tembelekan leaf gel planning utilized as a characteristic natural substance can be utilized to clean hands from microscopic organisms that is simple, reasonable and protected to use without utilizing water.
Test The Activity of Microgel Preparations from Skin Extract Jengkol (Pithecellobium lobatum Benth) on The Healing of Cut Wounds in White Rats (Rattus novergicus)
Authors: Utama Rezza Fikrih , Situmorang Renni Paska , Husaini Fahri , Andry Muhammad , Wijayanti Fitria Eka Resti
Published: September 2024

The skin is the largest and heaviest organ in the body, covering its outer surface. Wounds are often experienced by everyone due to the loss of epithelial integrity of the skin. Jengkol fruit skin is useful as a burn medicine and antiseptic to test the activity of microgel preparations from jengkol skin extract (Pithecellobium lobatum Benth) on healing cuts in white rats (Rattus novergicus). This study was a true experimental, post test control only design using the Completely Randomized Design (CRD) statistical method. The data were analyzed statistically using SPSS and continued with ANOVA test to see significant differences between the 5 treatment groups. The results of the study obtained microgel preparations that had activity for healing cuts on the backs of white rats, namely the F3 preparation with a concentration of 15% jengkol skin extract with wound observation for 12 days. In conclusion, cuts on the backs of white rats can be healed with jengkol skin extract.
RELATO DE EXPERIÊNCIA EM UMA ESCOLA ESPECIALIZADA PARA O ENSINO DE LÍNGUA PORTUGUESA COMO SEGUNDA LÍNGUA PARA ALUNOS SURDOS NO ESTADO DO PARÁ
Authors: Nascimento Patricia Mesquita dos Santos do , MONTEIRO BRENDA TAINA DA SILVA , Moller Fernando do Nascimento
Published: September 2024

A cultura de ensinar é um reflexo do que sabemos, acreditamos ou, até mesmo, da maneira que o ensino nos foi transmitido. Diante disso, o ensino é uma filosofia de trabalho, princípios, pressupostos,
INCLUSÃO SOCIAL DE SURDOS PLURILÍNGUES NO POVOADO VÁRZEA QUEIMADA/PI
Authors: Franco Telma
Published: September 2024

Esta obra é resultado de uma pesquisa de doutorado
sobre o processo de inclusão dos Surdos de Várzea Queimada,
povoado de Jaicós(PI). Conheci a história desses sujeitos,
pesquisando sobre surdez, área pela qual me interesso desde
que cursei o Mestrado em Educação, na Ufpi. A partir daí,
iniciei uma busca de informações sobre essa história singular:
Surdos plurilíngues, que haviam criado sua própria língua de
sinais (Cena).
Patient Preferences and Expectations in Analgesia for First Trimester Surgical Abortion
Authors: Sharp Chloé , Biefeld Sharla , Singh Rameet H. , Bayat Lily
Published: September 2024

A central component of a patient’s abortion experience is pain perception and optimization of pain management choices. Yet, data on patients’ experience of pain and their preferences regarding pain strategies are limited and tend to utilize solely quantitative data. This study utilized a qualitative thematic analysis to identify patient priorities, preferences, and expectations for pain management during first-trimester surgical abortion with nitrous oxide or oral sedation. Thirty-one patients seeking a first-trimester surgical abortion, self-selecting inhaled nitrous oxide (NO) (16 patients), or oral sedation (PO) with oxycodone and Ativan (15 patients) enrolled in this prospective cohort study. Participants provided demographic data, rated procedure pain on a 10 cm visual analog scale (VAS), and participated in semi-structured interviews. We analyzed qualitative data using a content analysis approach. Pre-procedure participants wanted a positive experience. Participants endorsed an ideal analgesic as having a quick onset of action, minimal side effects, no addiction potential, and being effective at reducing pain. After the procedure, there we start differences between priorities in NO and PO participants. NO participants valued the resumption of everyday activities, while PO participants desired ongoing anxiolysis. Anticipatory counseling often mitigated higher procedure pain and more medication side effects than anticipated. Participants emphasized that positive interactions with providers/staff significantly improved their abortion experience. Preemptive comprehensive counseling about procedure and analgesic effectiveness, along with providing options for analgesia, will facilitate an affirmative and patient-centered abortion experience.
Exploring College-Aged Student Anxiety: Aggravating Factors and Coping Strategies
Authors: Volkman Julie E. , Wolf Bianca M. , Morse Chris R. , Browning Ella , High Andrew , Lacey Heather Pond , Trunzo Joseph , Samter Wendy
Published: September 2024

Undergraduate college-aged students are increasingly experiencing anxiety. Yet, many struggle to cope effectively, resulting in poor school performance and compromised health and well-being. Our goal was to identify common anxiety-inducing and aggravating stressors, as well as preferred adaptive coping strategies, in this exploratory study to inform anxiety intervention development. A total of 19 undergraduate students (17 female and 2 male) were recruited. Students previously diagnosed or treated for anxiety by a clinician participated in a two-week, daily diary entry study. A total of 219 diary entries were transcribed and thematically analyzed for student reports of awareness variables and associated coping responses. Data were compared and triangulated. Framed by cognitive-behavioral approaches to anxiety and the transactional theory of stress and coping, we identified five primary categories of anxiety-inducing or aggravating stressors: academic time management and performance, communication anxiety, competing life stressors, others’ presence and problems, and generalized uncertainty. In addition, we found that students primarily utilized adaptive coping strategies, employing a mix of intrapersonal (e.g., alone time, breaks, hobbies/music, and staying productive) and interpersonal techniques (e.g., hanging out with and talking with friends and family). Findings highlight common anxiety stressors and demonstrate preferred and efficacious coping strategies employed by students, providing valuable insight into best practices for student well-being interventions beyond a clinical setting to manage anxiety and improve student well-being.
COVID-19 na América Latina: Desigualdades sociais, manipulação estatal e desafios para a reconstrução — o caso do Brasil
Authors:   Instituto Federal de Educação, Ciência e Tecnologia de Goiás, Departamento de Áreas Acadêmicas, Silva Luciano Nunes da , Silva Manuel Carlos ,   Centro Interdisciplinar de Ciências Sociais (CICS.NOVA.UMinho) & Centro de Estudos Avançados Multidisciplinares (CEAM, Universidade de Brasília)
Published: September 2024

As ações de combate à COVID-19 expuseram as mazelas de uma sociedade historicamente desigual, visíveis no precário saneamento básico, na perda de emprego/renda e no aumento da pobreza. Tendo como fontes principais dos dados a Comisión Económica para América Latina y el Caribe, a Organização Mundial de Saúde e o Instituto Brasileiro de Geografia e Estatística, este artigo analisa os impactos da pandemia nas desigualdades sociais na América Latina, com foco no Brasil, precedido por um debate sociológico sobre pobreza, exclusão e desigualdade. Os dados indicam que a pandemia intensificou as desigualdades sociais, com as classes mais favorecidas a reforçarem as suas posições e as classes mais pobres a serem drasticamente afetadas em diferentes aspetos, em função da pertença de classe, étnico-racial, de género, idade, condições de saúde, tornando-as ainda mais vulneráveis ao risco de doença e morte. Por fim, apela-se à construção de uma sociedade menos injusta e mais solidária, alicerçada em lutas coletivas, tendo no horizonte uma sociedade democrática e igualitária.
Method development and validation of taraxerol by using high performance liquid chromatography
Authors: Priyanka D. Gore  , Vikas Rajurkar  , Sajid Shaikh  , Karna B Khavane  , Pallavi Patharkar
Published: September 2024

Taraxerol is a bioactive compound found in several higher plants that exhibits many specific biological effects, particularly in the field of medicine. Although taraxerol has limited antioxidative efficacy and only modest antibacterial activities, many studies have shown its promise as an anti-plasmodial, antidiabetic, anticancer, anti-inflammatory, and anti-dermatophyte agent. A robust analytical approach for quantifying Taraxerol using High Performance Liquid Chromatography (HPLC) is the main objective of this research endeavor. An analysis of Taraxerol revealed a retention time of 3.519 minutes. Within the concentration range of 20-70 μg/mL, the drug exhibited a linear relationship, with a correlation coefficient of 0.999. The determination of the limit of detection (LOD) and limit of quantitation (LOQ) yielded values of 0.0026 μg/mL and 0.0081 μg/mL each. The accuracy of the approach was considered satisfactory, as the average recovery percentage was within the allowed range of 99.92-100.33%.
The role of blockchain technology and smart contracts in enhancing the transparency of fragmented investments in overseas real estate
Authors: Chao Ding
Published: September 2024

As the mobility of global capital is getting higher, more and more investors tend to invest in overseas real estate. However, the conventional model of investing in real estate possesses several disadvantages including high entry hurdles, low levels of market liquidity, and low transparency, particularly for retail investors. This article will seek to establish how blockchain technology as applied in smart contracts can help in the clarification of unclear fragmented investments in overseas property. First of all, this paper begins with the definition and examples of applying conventional and advanced blockchain technology and then describes the work of smart contracts and the comparison between regular contracts and smart contracts. The paper also evaluates the nature of fragmented investment in overseas property and its associated risks before suggesting the use of blockchain and smart contracts for a new institutional structure of the investment platform. This study demonstrates how the technologies can advance data sec, promote trust in transactions, and how investment can be automated. It can be concluded that blockchain technology, and smart contracts, can enhance Overseas Real Estate Investment by increasing transparency and decreasing the investment threshold as well as the instances of fraud. This study also presents an analysis of the potential difficulties that may be encountered in real-world applications and a recommendation of what may be done in subsequent studies. On one hand, this research offers a new perspective to the theoretical world, on the other hand, it offers practical problems and solutions to the practitioners who are a part of overseas real estate markets and businesses by steadily helping the overseas real estate markets to move in the fairer and more transparent direction.
Optimization and performance improvement of distributed data storage in hybrid storage systems
Authors: Hongtao Liu
Published: September 2024

With the rapid development of information technology, the storage and processing of massive data has become one of the important challenges facing the current computing field. Traditional centralized storage systems have been unable to meet the needs of big data applications, while distributed storage systems have become the infrastructure of modern data centers because of their high scalability and high availability. However, in practical applications, a single distributed storage model is often difficult to balance cost-effectiveness and performance requirements. Therefore, this paper proposes a hybrid storage system model combining local storage and cloud storage resources and discusses a series of optimization strategies for this model. The focus of the research is to improve the overall performance of the system through the design of intelligent data sharding, redundancy and fault tolerance mechanisms, and the application of effective load balancing technology. The effectiveness and superiority of the proposed method are verified by testing and analyzing several typical application scenarios on the experimental platform. The experimental results show that the optimized hybrid storage system not only significantly improves the speed of data access, but also effectively reduces the storage cost, demonstrating its potential in future large-scale data management.
IMPLEMENTASI PROGRAM REHABILITASI SOSIAL DALAM PEMBERDAYAAN PENYANDANG DISABILITAS OLEH DINAS SOSIAL DAN PEMBERDAYAAN MASYARAKAT KOTA SAMARINDA
Authors: Alfarabbi Riza Korin , Indarto Kus
Published: September 2024

Masalah: Implementasi Program Rehabilitasi Sosial dalam pemberdayaan penyandang disabilitas adalah pelaksanaan dari Dinas Sosial dan Pemberdayaan Masyarakat Kota Samarinda yang dilakukan guna memfasilitasi wadah bagi kelompok penyandag disabilitas dengan cara menginspirasi, dan meningkatkan kesadaran akan bakat yang dimilikinya, serta mendorong perkembangannya. Namun, dalam usaha memberdayakan penyandang disabilitas, masih ditemukan adanya keterbatasan Dinas Sosial dalam pemberian alat bantu yang belum merata kepada penyandang disabilitas seperti kursi roda, tongkat, masih kurangnya penyuluhan atau sosialisasi kepada seluruh masyarakat untuk tidak mendiskriminasi penyandang disabilitas, belum adanya fasilitas untuk pelatihan kemandirian terhadap penyandang disabilitas sehingga harus dikirim keluar kota seperti Surakarta, Cibinung, dan Makassar yang dilaksanakan 1 tahun sekali. Tujuan: Penelitian ini dilakukan dengan tujuan untuk menganalisis implementasi Program Rehabilitasi Sosial dalam pemberdayaan penyandang disabilitas oleh Dinas Sosial dan Pemberdayaan Masyarakat Kota Samarinda dan mengidentifikasi faktor penghambat dalam implementasi Program Rehabilitasi Sosial dalam pemberdayaan penyandang disabilitas oleh Dinas Sosial dan Pemberdayaan Masyarakat Kota Samarinda.Metodologi: Fokus penelitian berdasarkan teori dari Korten yang terdiri dari kesesuaian antara program dengan pemanfaat, kesesuaian antara program dengan organisasi pelaksana, kesesuaian antara kelompok pengguna dengan organisasi pelaksana serta faktor penghambat implementasi Program Rehabilitasi Sosial dalam pemberdayaan penyandang disabilitas oleh Dinas Sosial dan Pemberdayaan Masyarakat Kota Samarinda. Jenis penelitian yang digunakan adalah kualitatif dengan metode deskriptif. Teknik pengumpulan data dilakukan dengan observasi, wawancara, dokumentasi. Analisis yang digunakan ialah model interaktif yang dikembangkan oleh Miles, Huberman dan Saldana.Temuan/Hasil Penelitian: Hasil Penelitian mengenai implementasi Program Rehabilitasi Sosial dalam pemberdayaan penyandang disabilitas oleh Dinas Sosial dan Pemberdayaan Masyarakat Kota Samarinda sudah terlaksana namun belum maksimal, hal ini disebabkan masih ditemukan ketidaksesuaian dalam memberikan alat bantu dan masih belum tersosialisasikan dengan baik program yang diberikan kepada penyandang disabilitas sebagai kelompok penerima manfaat. Namun dalam proses pelaksanaanya terdapat faktor-faktor yang menjadi penghambat dalam mengimplementasikan Prorgram Rehabilitasi Sosial seperti, kurangnya keterbukaan keluarga penyandang disabilitas dan adanya keluarga penyandang disabilitas yang pindah alamat tanpa memberi tahu Dinas Sosial.Jenis penelitian: Deskriptif
The technological transformation of the Russian energy sector forced by carbon regulation
Authors: Shigina A. V. , Khorshev A. A.
Published: September 2024

RELEVANCE of the study lies in the assessment of the impact that various carbon regulation instruments stimulating the achievement of national climate goals have on the development scale of different electricity and heat production technologies in Russia.

THE PURPOSE. To consider the change in the optimal technological structure of the electric power industry and district heating in Russia by 2050 assuming the introduction of various carbon regulation instruments in 2030.

METHODS. We used the developed at ERI RAS system technological model EPOS for the optimization of the energy technology structure in the Russian energy sector according to the criterion of the minimum total discounted costs for energy supply to the economy until 2050.

RESULTS. The article provides an analysis of the scale of changes in installed capacity and electricity production of various types of power plants in the UES of Russia, as well as changes in heat production of different heat supply sources by 2050 for 16 carbon regulation options and business-as-usual scenario. Also it describes the optimal technological structure in the electric power industry and district heating under the conditions of certain administrative, fiscal and economic instruments of climate policy. Carbon regulation options based on the corresponding increases in the installed capacity of power plants in the UES of Russia by 2050 are compared.

CONCLUSION. Decarbonization of the electric power industry in Russia will mainly occur by expansion of nuclear energy, heat production – by deployment of electric boilers, taking into account current forecasts of scientific and technological progress. At the same time, for carbon regulation options leading to a greenhouse gas emissions reduction by 30% relative to 2019 level, nuclear power plants could become the new dominant technology in the structure of electricity production instead of gas thermal power plants. The total increase in installed capacity of power plants in the UES of Russia by 2050 may differ by almost seven times for various carbon regulation options. Among the climate policy options considered, emission quotation and carbon taxes have the strongest impact on the technological structure of the electric power industry and district heating in Russia.
Development and verification of a multi-component model for steam methane reforming
Authors: Gizzatullin A. R. , Filimonova A. A. , Chichirova N. D.
Published: September 2024

RELEVANCE. Steam methane reforming is the dominant method of hydrogen production. Its significant share in global CO2 emissions highlights the importance of optimizing technological parameters to reduce environmental impact. The developed multi-component model of steam methane reforming in COMSOL Multiphysics is relevant not only due to its applicability for optimizing existing production facilities but also for its potential in developing new methods for utilizing associated petroleum gas. In the context of import substitution in the hydrogen energy sector, this model is also of interest, allowing for the calculation of technological parameters of industrial installations.

THE PURPOSE. The aim of the work is to develop and verify a multi-component model of steam methane reforming.

METHODS. The research methodology includes the use of experimental data from the literature and industrial indicators for integration into a multi-component model in COMSOL Multiphysics. This enables the modelling of complex chemical interactions under conditions characteristic of the industrial steam methane reforming process.

RESULTS. The developed multi-component model allows calculating key parameters of the steam methane reforming process, including the concentration of components (methane, hydrogen, carbon monoxide, and carbon dioxide) and temperature along the reactor. The model successfully describes the chemical interactions between components and takes into account the influence of operating conditions, such as temperature, pressure, and steam/gas ratio, on process efficiency. The model verification was carried out by comparing the modelling results with experimental data and indicators of real industrial processes. Their correspondence confirms the high degree of reliability and suitability of the model for practical application in engineering calculations and optimization of steam methane reforming processes.

CONCLUSION. The conclusions made based on the modelling can be used for further improvement of methane conversion technologies, contributing to their efficiency and environmental friendliness. There is also potential for using the model to calculate the stages of installations for the utilization of products from the processing of associated petroleum gas.
Determining the efficiency of local heat recycling wastewater based on a heat exchanger
Authors: Kunitskiy V. A. , Lukin S. V.
Published: September 2024

RELEVANCE. The authors research the potential energy, economic and environmental effects of using local heat recovery from wastewater generated in showers. At the moment in Russia, almost all household wastewater is disposed of in sewer networks without the beneficial use of the heat that they possess. It is important to determine the effect of implementing this method of heat recovery, to identify and analyze the problems that prevent this from being done.

THE PURPOSE. The purpose of the work is to determine the potential effect of using local heat recovery from wastewater generated in showers.

METHODS. Based on a verified mathematical model of the heat exchanger, the energy effect from the individual use of the shower room is determined. A number of assumptions are applied to the heat consumption structure of an individual building and, based on available data on the average annual heat consumption of residential buildings in Moscow, the economic and environmental effect of energy-saving measures is calculated.

RESULTS. Relative savings within the annual heat consumption of a building with a decentralized and centralized hot water supply system were 5,3% and 3,1%, respectively (64 and 37 GCal). Fuel economy amounted to: 9145 toe and 5227 toe for a building with a decentralized and centralized hot water supply system, respectively (14,5 and 8,5 thousand tons of CO2-eq). The payback period for energy-saving measures for the case of a decentralized hot water system based on an instantaneous electric water heater was 1,5 years.

CONCLUSION. Local waste heat recovery makes it possible to obtain a significant energy and environmental effect within any locality, but at the moment there are no measures to support consumers implementing energy-saving measures. Currently, this method of heat recovery is of interest only to those consumers whose source of thermal energy for the needs of hot water supply is electricity.
Control of deposits on pipeline systems by the method of free oscillations
Authors: Garnyshova E. V. , Izmaylova E. V.
Published: September 2024

RELEVANCE. There are a large number of heat exchangers in operation enterprises that operate under various temperature conditions. Steam, hot water, heated products of oil refining and other industries, which may contain oxides of iron, aluminum, calcium sulfate silicates, etc., are used as a heating agent. The efficiency of the heat exchange equipment depends on the condition of the heating surfaces. Contamination of these surfaces with various deposits dramatically reduces the heat transfer coefficient, which leads to a significant increase in heat consumption. The nature of the deposits depends on the properties of the heating agent and the heated medium.

THE PURPOSE. The purpose is to assess the possibility of controlling deposits on the surfaces of heat exchange equipment by the free oscillation method. The presence of deposits changes the mass of structures and, consequently, the natural frequencies of vibrations, the analysis of which can determine not only the presence and thickness of deposits, as well as their appearance.

METHODS. The paper shows the results of experimental studies conducted using a hardware and software package and calculations of natural vibrations of the surfaces of heat exchange equipment in the ANSYS software package to identify their dependence on the thickness and density of deposits. A plate, a pipe, and a pressurized pipe were modeled as heat transfer surfaces.

RESULTS. The results obtained experimentally and computationally coincided, and it was concluded that the free oscillation method makes it possible to determine not only the presence of deposits on heat exchange surfaces, but their thickness and appearance.

CONCLUSION. The free oscillation method can detect deposits in a timely manner and monitor their condition, which in turn will, reduce overall operating costs, increase energy efficiency and extend service life.
PENGARUH KEAKTIFAN BELAJAR DAN KEMAMPUAN METAKOGNITIF TERHADAP INDEKS PRESTASI KUMULATIF MAHASISWA
Authors: Afrisno Udil Patrisius
Published: September 2024

Penelitian ini bertujuan untuk mengungkap pengaruh keaktifan belajar dan kemampuan metakognitif terhadap IPK mahasiswa pendidikan matematika Universitas Nusa Cendana. Penelitian ini termasuk penelitian dengan pendekatan kuantitatif dan menggunakan metode expost facto. Populasi dalam penelitian ini adalah seluruh mahasiswa aktif prodi pendidikan matematika Undana tahun akademik 2021/2022 dengan sampel dipilih secara random 1 angkatan yaitu angkatan 2019/2020. Instrumen yang digunakan adalah angket keaktifan belajar dan angket kemampuan metakognitif mahasiswa. Data yang diperoleh dianalisis secara statistik dengan regresi linear berganda menggunakan SPSS 25. Hasil penelitian menunjukkan bahwa terdapat pengaruh yang signifikan secara simultan keaktifan belajar dan kemampuan metakognisi terhadap IPK mahasiswa pendidikan matematika Undana.
ANALISIS PENGGUNAAN MEDIA SOSIAL DALAM PEMBELAJARAN MATEMATIKA
Authors: Yunita Teto Maria Selviana , Lebe Pule Meliani
Published: September 2024

Pada era revolusi industri 4.0 dan society 5.0 internet telah menjadi sebuah kebutuhan hidup manusia.Pengguna internet di Indonesia telah mencapai lebih dari 50% jumlah penduduknya. Pengguna internetlebih banyak menggunakan internet untuk mengakses Media Sosial. Matematika mempunyai objek yang bersifat abstrak sehingga dibutuhkan keterampilan untuk bisa mengajarkan matematika supaya menarik dan tidak membosankan. Media sosial dapat menjadi salah satu sarana atau media dalam pembelajaran matematika. Tujuan penelitian ini adalah untuk mengetahui penggunaan media sosial dalam pembelajaran matematika di program studi pendidikan matematika Universitas Katolik Widya Mandira. Penelitian ini menggunakan pendekatan deskripsi kuantitatif. Data dikumpulkan melalui angket. Subjek dalam penilitan ini yakni dosen dan mahasiswa. Hasil analisis menunjukan bahwa dosen dan mahasiswa di program studi pendidikan matematika Universitas Katolik Widya Mandira merupakan pengguna aktif media sosial. Media sosial yang sering mereka pakai seperti : whatsapp, youtube, zoom meeting. Dan mereka menyatakan bahwa media sosial tersebut sangat membantu mereka dalam pembelajaran matematika.
FADED EXAMPLE SEBAGAI ALAT UNTUK MEMFASILITASI PEMBELAJARAN MATEMATIKA SEKOLAH
Authors: Nabuasa Adit , Sensiana Blegur Irna Karlina
Published: September 2024

Pembelajaran harus dirancang dengan siswa sebagai pusatnya, yaitu siswalah yang secara aktif membangun pengetahuan. Sedangkan peran guru sebagai fasilitator yaitu seseorang yang memfasilitasi siswa untuk membangun pengetahuan secara efektif dan efisien. Salah satu tindakan yang dapat mewujudkan peran guru ini adalah melalui pemilihan strategi pembelajaran yang tepat.  Menurut Cognitive Load Theory, pemilihan strategi pembelajaran sebaiknya mempertimbangkan pengetahuan awal siswa. Siswa dengan pengetahuan awal rendah memerlukan tuntunan secara eksplisit (explicitly guided instruction), sebaliknya siswa dengan pengetahuan awal yang tinggi dapat belajar dengan tuntunan yang implisit (implicitly guided instruction). Karena itu pemilihan strategi yang mengkombinasikan kedua prinsip ini pada pembelajaran matematika di kelas dengan pengetahuan awal siswa yang beragam nampaknya tepat untuk diterapkan. Salah satu strategi yang dimaksud adalah faded example.  Strategi ini merupakan transisi dari belajar secara explicit guidance ke implicit guidance secara bertahap. Karena itu strategi ini tetap memfasilitiasi siswa baik yang berpengetahuan awal rendah maupun tinggi untuk membangun pengetahuan secara mandiri. Artikel ini   merupakan study literature yang bertujuan untuk membahas tentang strategi faded example. Lebih lanjut contoh desain pembelajaran pada materi trigonometri dan bagaimana strategi ini memfasilitasi pembelajaran matematika siswa juga dibahas dalam artikel ini.
KRITERIA KESALAHAN SISWA-SISWI KELAS X SMA NEGERI TAMALABANG DALAM MENYELESAIKAN SOAL CERITA TENTANG SISTEM PERSAMAAN LINIER TIGA VARIABEL (SPLTV)
Authors: Imamastri Puling Tang Melki , Marianti Loban Jeni
Published: September 2024

Sistem persamaan linear tiga variabel merupakan salah satu materi dalam matematika yang mulai diperkenalkan dalam jenjang pendidikan pada sekolah menengah atas. Tujuan pembelajaran SPLTV di tingkat  SMA dan sederajat adalah penyelesaian masalah. Pembelajaran SPLTV diawali dengan mengenali tentang bentuk umum dari SPLTV itu sendiri . Penelitian ini dikategorikan sebagai penelitian kuantitatif  karena melakukan perhitungan rata-rata nilai siswa-siswi kelas X SMA Negeri Tamalabang antara tes awal dan tes akhir. Hasil tes yang diperoleh peneliti menunjukkan bahwa pada indikator membuat model matematika dan menentukan penyelesaian SPLTV dengan metode Eliminasi dan membuat model matematika dan menentukan penyelesaian SPLTV dengan metode  eliminasi dan subsitusi dengan tingkat kesalahannya tergolong tinggi dengan presentase kesalahan sebesar 83,33%. Kesalahan siswa pada indikator mengidentifikasi SPLTV khusus dan penyelesaiannya. Sedangkan besaran yang ada dalam masalah soal cerita ke dalam variabel matematika yang dilambangkan dengan huruf-huruf pada sistem persamaan membuat model berdasarkan soal cerita tergolong sangat rendah dengan presentase kesalahan sebesar 50%.  Perlu dilakukan evaluasi dan strategi belajar yang mengarah pada penyederhanaan konsep belajar yang dapat membuat para siswa terangsang  untuk lebih tertarik pada proses KBM matematika.
PROFIL KEMAMPUAN PEMECAHAN MASALAH MATEMATIKA PESERTA DIDIK SMP
Authors: I. M. Soares Marilia , V. Uskono Irmina , O. Jagom Yohanes , G.M.Gawa Maria , B.N.Dosinaeng Wilfridus , H. Kaluge Agapitus
Published: September 2024

Penelitian ini bertujuan untuk mendeskripsikan profil kemampuan pemecahan masalah matematis peserta didik pada materi SPLDV berdasarkan langkah Polya. Jenis penelitian ini merupakan penelitian kualitati. Subjek dalam penelitian ini 3 peserta didik kelas VIII B SMPK St. Familia. Subjek dipilih berdasarkan hasil tes kemampuan pemecahan masalah pada meteri SPLDV. Instrumen yang digunakan dalam penelitian ini berupa tes pemecahan masalah yang berjumlah 2 soal, setelah diberikan tes kemudian dilakukan wawancara kepada subjek untuk lebih menggali kemampuan pemecahan masalah peserta didik dan mengklarifikasi hasil yang telah ditulis. Hasil dari penelitian ini adalah peserta didik kemampuan tinggi mampu untuk melaksanakan semua tahapan pemecahan masalah berdasarkan Polya yaitu memahami masalah, membuat rencana, melaksanakan rencana dengan langkah-langkah penyelesaian yang tepat dan memeriksa kembali. Peserta didik kemampuan sedang dalam pemecahan masalah berdasarkan langkah Polya hanya melaksanakan 2 tahapan pemecahan masalah, yaitu mampu memahami masalah, membuat rencana namun belum maksimal, namun belum mampu melaksanakan rencana penyelesaian dengan tepat karena masih keliru dalam operasi hitung dan belum mampu melaksanakan tahapan memeriksa kembali. Peserta didik kemampuan rendah dalam pemecahan masalah berdasarkan langkah Polya hanya melakukan 1 tahapan pemecahan masalah yaitu mampu memahami masalah, membuat rencana namun belum maksimal, belum mampu dalam melaksanakan rencana penyelesaian dengan langkah-langkah yang tepat serta belum mampu melakukan tahapan memeriksa kembali
PERBANDINGAN MODEL POPULASI MALTHUS DAN MODEL POPULASI VERHULST DALAM MENGESTIMASI JUMLAH PENDUDUK KABUPATEN NGADA
Authors: Wae Misi Maria Laurentina , Paulina Maure Osniman , Grace Ludji Dian
Published: September 2024

Dampak negatif dari tingginya tingkat pertumbuhan penduduk di suatu daerah adalah tidak meratanya fasilitas umum, diantaranya fasilitas kesehatan, gedung sekolah, jalan umum, dan fasilitas lainnya. Salah satu solusi untuk mengurangi dampak negatif dari tingginya pertumbuhan penduduk adalah melakukan estimasi menggunakan model populasi Malthus dan model populasi Verhulst. Oleh sebab itu, tujuan penelitian ini yaitu mengestimasi jumlah penduduk Kabupaten Ngada pada tahun 2025. Metode yang digunakan dalam penelitian ini adalah Studi Pustaka. Data penelitian ini adalah data jumlah penduduk Kabupaten Ngada tahun 2011-2020 yang diperoleh dari Badan Pusat Statistik Provinsi Nusa Tenggara Timur. Berdasarkan hasil penelitian diperoleh model Verhulst IV merupakan model terbaik untuk mengestimasi jumlah penduduk Kabupaten Ngada. Hasil perhitungan menggunakan model Verhulst IV menunjukan bahwa jumlah penduduk Kabupaten Ngada di tahun 2025 diperkirakan mencapai 180.288 jiwa.
ANALISIS PROFIL SISWA KELAS VIII DALAM MEMAHAMI KONSEP ROTASI
Authors: F. Loma Dorothea , D. Djong Kristoforus , B.N. Dosinaneg Wilfridus , J. Fernandez Aloysisus , I. Leton Samuel , Lakapu Meryani , Lakapu Meryani
Published: September 2024

Penelitian ini bertujuan untuk mendeskripsikan profil siswa kelas VIII dalam memahami konsep rotasi di SMP Negeri 5 Kupang. Jenis penelitian ini adalah kualitatif d eskripsi. Waktu pelaksanaan penelitian pada semester ganjil tahun ajaran 2022/2023. Subjek dalam penelitian ini diambil 3 siswa yang berkemampuan akademik tinggi, sedang dan rendah dari kelas VIII. Kemampuan tersebut dilihat berdasarkan hasil ulangan harian matematika. Teknik pengumpulan data menggunakan metode tes, wawancara, dan dokumentasi. Teknik analisis data dilakukan dengan tiga tahapan yaitu reduksi data, penyajian data, dan penarikan kesimpulan. Hasil penelitian menunjukan bahwa siswa memiliki kemampuan matematika tinggi memenuhi indikator memahami soal, menyajikan konsep dalam berbagai bentuk representasi matematika, mengaplikasikan konsep atau algoritma dalam pemecahan masalah. Siswa yang memiliki kemampuan matematika sedang memenuhi indikator memahami soal, menyajikan konsep dalam berbagai bentuk representasi matematika, mengaplikasikan konsep atau algoritma dalam pemecahan masalah. Sedangkan siswa yang memiliki kemampuan matematika rendah kurang mampu memahami indikator memahami soal, menyajikan konsep dalam berbagai bentuk representasi matematika, mengaplikasikan konsep atau algoritma dalam pemecahan masalah.
ETNOMATEMATIKA PADA PASAR BARTER BANIONA DAN PENERAPANNYA DALAM PEMBELAJARAN MATEMATIKA
Authors: Mince Lagadon Mariana , Marta Towe Mariana , Bin Frans Resi Bernadus
Published: September 2024

Penelitian bertujuan untuk mendeskripsikan aspek- aspek matematis yang terkandung dalam pasar barter Baniona di desa Klukengnuking, dan menerapkan aspek-aspek matematika yang terdapat pada Pasar Barter Baniona dalam pembelajaran matematika. Jenis penelitian ini adalah kualitatif. Penelitian ini melibatkan pelaku barter dan siswa kelas VIII C SMP Negeri 2 Adonara Barat. Teknik pengumpulan data yang digunakan adalah observasi, lembar kerja peserta didik, dan dokumentasi. Teknik analisis data yang digunakan yaitu pengumpulan data, reduksi data, penyajian data, dan penarikan kesimpulan. Hasil penelitian diperoleh (1) aspek–aspek matematis yang terkandung dalam Pasar Barter Baniona diantaranya: perbandingan senilai, pola bilangan, geometri, dan himpunan; (2) penerapan aspek - aspek matematika yang terdapat pada Pasar Barter Baniona dalam pembelajaran matematika menggunakan sintaks PBL yaitu orientasi, organisasi, investigasi, mengembangkan dan mempersentasikan hasil.
ANALISIS KEMAMPUAN PEMAHAMAN RELASIONAL PESERTA DIDIK DITINJAU DARI SELF DIRECTED LEARNING
Authors: Bince Kumanireng Lusia , Kiang Lagamakin Arkadius
Published: September 2024

Tujuan dari penelitian adalah untuk menganalisis kemampuan pemahaman relasional peserta didik ditinjau dari self directed learning. Jenis Penelitian ini merupakan deskriptif kualitatif yang dilakasanakan di SMA Negeri 1 Larantuka pada peserta didik kelas X MS 1 berjumlah  peserta didik, yakni  orang yang memiliki self directed learning tinggi,  orang dengan self directed learning sedang, dan  orang dengan self directed learning rendah. Instrumen yang digunakan pada penelitian ini adalah angket self directed learning, soal tes kemampuan pemahaman relasional dan pedoman wawancara. Hasil penelitian menunjukan bahwa peserta didik yang memiliki kemampuan self directed learning pada tingkat tinggi dapat memenuhi tiga indikator kemampuan pemahaman relasional yakni, 1) peserta didik mengetahui konsep yang sesuai dengan soal yang diberikan; 2)  menerapkan suatu metode dan prosedur yang sesuai dengan permasalahan yang diberikan; 3) mampu menjelaskan alasan penggunaan metode dan prosedur tersebut. Sedangkan, self directed learning pada tingkat sedang memenuhi indikator point 1 dan point 2; Self directed learning pada tingkat rendah hanya memenuhi indikator point 1
ANALISIS KEMAMPUAN PEMAHAMAN KONSEP MATEMATIS SISWA KELAS X MA MODERN ARAFAH
Authors: Norhaslina  , Erita Selvia
Published: September 2024

Salah satu hal penting dalam pembelajaran matematika yaitu pemahaman konsep matematis. Tujuan penelitian ini yaitu untuk mendeskripsikan kemampuan pemahaman konsep matematis siswa pada materi bentuk pangkat dan bentuk akar. Penelitian ini mengggunakan jenis penelitian kualitatif deskriptif. Teknik pengumpulan data dalam penelitian ini menggunakan metode tes. Subjek penelitian yaitu seluruh siswa kelas X MAS Modern Arafah yang terdiri dari 10 siswa. Dari hasil tes soal kemampuan pemahaman konsep matematis siswa, terdapat 4 siswa dengan persentasi 40% berada dalam kriteria tinggi, 2 siswa dengan persentasi 20% berada dalam kriteria sedang, dan 4 siswa dengan persentasi 40% berada dalam kriteria rendah. Dari hasil 3 indikator ditemukan bahwa pada indikator pertama terdapat 6 siswa menjawab benar dan 4 siswa lainnya menjawab dengan kurang tepat. Dalam indikator kedua terdapat 4 siswa menjawab benar, 4 siswa menjawab dengan kurang tepat dan 2 siswa menjawab salah. Dan pada indikator ketiga terdapat 3 siswa menjawab benar, 4 siswa menjawab dengan kurang tepat dan 2 siswa menjawab salah. Sehingga dari keseluruhan hasil tes soal kemampuan pemahaman matematis siswa didapatkan nilai rata-rata dari seluruh siswa sebesar 66 dengan nilai KKM 70. Maka dapat disimpulkan bahwa kemampuan pemahaman konsep matematis siswa kelas X MAS Modern Arafah masih dalam kriteria sedang.
MENINGKATKAN PRESTASI BELAJAR MATEMATIKA SISWA DENGAN MEDIA “MILAK DULAK”
Authors: D. Kornelis Marsen , S.P. Hun Welis , L. Morib Poniam , D. Djong Kristoforus , B.N.Dosinaeng Wilfridus
Published: September 2024

Penelitian Tindakan Kelas (PTK) ini bertujuan untuk meningkatkan prestasi belajar matematika siswa melalui penggunaan media pembelajaran milak dulak. Subyek dari penelitian ini adalah guru dan semua siswa kelas 5 SDN Oefoe Kecamatan Rote Barat Tahun Pelajaran 2023/2024. Sedangkan obyek penelitiannya yaitu aktivitas siswa, kemampuan berhitung siswa dan Kemampuan guru dalam mengelola pembelajaran. Media milak dulak merupakan media berbentuk bambu berwarna yang digunakan untuk mengajarkan perkalian pada siswa Kelas V.  Penelitian ini dilakukan dalam dua siklus dengan lima tahapan yaitu: perencanaan, tindakan, pengamatan, refleksi, dan perencanaan ulang. Instrumen penelitian yang digunakan yaitu: tes hasil belajar, lembar observasi kemampuan guru dalam mengelola pembelajaran dan lembar observasi aktivitas siswa. Siklus dikatakan berhasil jika paling sedikit 70% siswa tuntas. Hasil penelitian menunjukkan bahwa: terjadi peningkatan skor persentase jumlah siswa yang tuntas yaitu 56% pada Siklus I menjadi 89% pada Siklus II sehingga dapat disimpulkan bahwa pembelajaran matematika dengan menggunakan media milak dulak telah berhasil di Siklus II. Penghitungan skor n-gain yang dilakukan memperoleh skor 0,32 sehingga dapat disimpulkan bahwa terjadi peningkatan prestasi belajar matematika siswa dari Siklus I ke Siklus II dengan kategori peningkatan sedang.
KONSTRUKSI ETNOMATEMATIKA PADA PERMAINAN TRADISIONAL AKA MALE DAN HAU LOIK DI KECAMATAN POLEN KABUPATEN TIMUR TENGAH SELATAN
Authors: Aloysius Nay Florianus , Runtius Lalang Andrian
Published: September 2024

Tergerusnya nilai-nilai kebudayaan akibat perkembangan teknologi yang masif perlu ada upaya-upaya untuk mengintegrasikan kebudayaan dalam pembelajaran. Penelitian ini bertujuan untuk mengungkap aspek etnomatematis permainan tradisional Aka Male dan Hau Lo’ik yang dimainkan masyarakat di Distrik Polen Kabupaten Timor Tengah Selatan. Penelitian ini merupakan penelitian etnografi dengan studi literatur, observasi dan wawancara sebagai sumber data. Dalam permainan Aka Male dan Hau Lo'ik terdapat beberapa konsep matematika antara lain: logika matematika, peluang, pembagi persekutuan terbesar dan menggunakan aturan sinus dan kosinus dalam menentukan sudut dan panjang sisi segitiga sembarang. Berdasarkan hasil yang diperoleh, permainan Aka Male dan Hau Lo’ik dapat dijadikan sebagai salah satu referensi sumber belajar dalam pembelajaran matematika di sekolah.