bluuebunny/crossref_metadata_2025_split huggingface dataset:
Podzolic-brown soils of the Far East on the Soil map of Russian Federation, scale 1 : 2.5 M, and their correlation with soils in the Russian soil classification
Authors: Ananko T. V. , Gerasimova M. I. , Savitskaya N. V. 
Published: April 2024

Podzolic-brown forest soils on the Soil Map of Russian Federation, scale 1 : 2.5 M, are widespread on the plains and plateaus of the Far East, referred to the Eastern brown-forest-soil area in the scheme of soil-geographical zoning. There, in Primorye and Priamurye regions, they are confined to various parent rocks and to different climatic and biota conditions. In the Classification of Soils of Russia (2004, 2008), there are no direct analogues of podzolic-brown soils in the map legend. To name these soils in the Russian classification system, regional publications (N.A. Kreida, G.I. Ivanov, V.I. Roslikova et al., N.M. Kostenkov, E.A. Zharikova) were reviewed: morphological and physicochemical properties of podzolic-brown soils were assessed in terms of their compliance with the diagnostic criteria of their possible analogues in the Russian system. The comparison has shown that in Primorye, on stony-loamy-clayey derivates of hard rocks, podzolic-brown soils correspond to soddy-pale-eluvial-metamorphic soils with textural differentiation, on loamy-clayey lacustrine-alluvial and colluvial deposits – as dark-humus podbels. In the north, in Priamurye region, podzolic-brown gley soils have properties of both texture-differentiated soils with the BT diagnostic horizon and of soils with a specific cryogenic structure in the middle cryometamorphic horizon. In the ideology and nomenclature of the Russian classification system, the former are defined as mucky-podzolic gleyic soils, the latter soils, as depending on the intensity of surface gley and structure development, can be defined as cryometamorphic podzolized gleyzems, eluvial-metamorphic cryometamorphic gleyic soils, or gleyic svetlozems.
Penyelesaian khusus persamaan diferensial biasa ordo dua linier tak homogen dengan koefisien konstan untuk fungsi bagian demi bagian
Authors: Gunawan Gani 
Published: April 2024

Spring mechanical vibration motion system with a damped degree of freedom and influenced by external forces, is mathematically expressed as an ordinary differential equation of order of two linear constant coefficients that are not homogeneous. If an external force acts on a stationary system expressed as a continuous function f(t) for any time t, then the system will experience mechanical vibrational motion which mathematically the equation of motion can be expressed as a superposition. The equation consists of as a solution to a homogeneous form with mechanical vibrations as a solution to a particular form. In terms of the particular solution this article will show a mathematical way when f(t) is a continuous function section by part which is defined at an interval, such that the mechanical vibration motion equation is at the same time a special solution of the equation the mechanical vibration system.
Keywords: Vibration, Impulse Functions, ConvolutionMSC2020: 34A37
Regularisasi model pembelajaran mesin dengan regresi terpenalti pada data yang mengandung multikolinearitas (Studi kasus prediksi Indeks Pembangunan Manusia di 34 provinsi di Indonesia)
Authors: Khamidah Nur , Sadik Kusman , M Soleh Agus , Dito Gerry Alfa 
Published: April 2024

This research intends to model high-dimensional data that contains multicollinearity in four machine-learning algorithms: Random Forest, K-Nearest Neighbor, XGBoost, and Regression Tree. Previously, regularization was carried out with penalized ridge regression, least absolute shrinkage and selection operator (LASSO) regression, and Elastic Net regression. A total of 100 predictor variables and 1 response variable which are the Development Index 2022 data of 34 provinces in Indonesia from BPS were used and standardized. The simulation is also applied to highly correlated data on two distributions, uniform and normal with parameter values taken from existing empirical data. The results showed that the ridge regularization method is the best for producing accurate and stable predictions. Furthermore, there was no difference in the root mean square error (RMSE) results between the data with standardization and without standardization, wherein all the data analyzed it was found that the kNN model was better than other models on simulation data, and the Random Forest and XGBoost models were better than other models on empirical data. In addition, the Regression Tree model is not recommended according to the results of this study.
Keywords: regularization, multicollinearity, ridge, LASSO, elastic netMSC2020: 62J07
Penerapan geographically weighted regression (GWR) dalam menganalisis kemiskinan di Pulau Jawa tahun 2022
Authors: Novaldi Jeremia , Pusponegoro Novi Hidayat 
Published: April 2024

Poverty is a priority issue for Indonesia. However, efforts to eradicate poverty in Indonesia have always failed to fulfill the targets set out in the RPJMN. Java Island, which is known as the center of the economy, has not yet solved this poverty problem. In 2022, the majority of provinces on Java Island still have a higher poverty rate than the target in the 2020-2024 RPJMN, which is 6.5-7 percent. Therefore, the objective of this study is to analyze the relationship between the socio-economic conditions of the society, represented by aspects of education, health, and income, and poverty in 119 regencies or cities on Java Island. Geographically weighted regression (GWR) with a fixed bi-square kernel is applied to fulfill the study objective. The results showed that poverty is affected by RLS in 84 districts/cities, influenced by AHH in 15 regencies or cities, and influenced by AHH and income per capita in 8 regencies or cities. However, these three variables do not affect the poverty rate in the 12 regencies or cities.
Keywords: Poverty, GWR, Spatial Analysis, SocioeconomicMSC2020: 91B72
Indeks Padmakar-Ivan dan indeks Randic pada graf non-koprima dari grup bilangan bulat modulo
Authors: Ghoffari Lalu Hasan , Wardhana I Gede Adhitya Wisnu , Abdurahim Abdurahim 
Published: April 2024

Graph theory, introduced by the Swiss mathematician Leonhard Euler in 1736, has played a pivotal role in solving real-world problems since its inception, notably exemplified by Euler's solution to the Konigsberg Bridge problem. Its applications extend to various domains, including scheduling, shortest path routing, and chemical structure representation. In chemistry, graphs are extensively used to depict molecular structures and chemical compounds, aiding in visualizing atomic connections and overall compound configurations. Topology indices, such as the Padmakar-Ivan (PI) and Randic indices, provide numerical values capturing chemical bonding relationships. Beyond chemical structures, these indices find applications in abstract algebraic graph representations. Recent research, exemplified by Husni et al.'s work on the harmonic and Gutman indices, explores these indices in coprime graphs of integer groups modulo prime power orders. Additionally, studies on non-coprime graphs of integer groups modulo reveal unique characteristics and invariants, shedding light on their structure. The non-coprime graph is a graph with two vertices said to be adjacent if the greatest common divisor (GCD) of their orders is not equal to one. This paper aims to investigate the topological indices, specifically the Padmakar-Ivan and Randic indices, in non-coprime graphs of integer groups modulo, adding depth to our understanding of their applicability and significance in abstract algebraic representations.
Keywords: Graph theory, padmakar-ivan index, randic index, non-coprime graphsMSC2020: 05C09
Karakteristik Kimia Tanah pada Areal Kelapa Sawit dan Nilai Konservasi Tinggi (NKT) di Kabupaten Tapin, Provinsi Kalimantan Selatan
Authors: Fiqri Muhammad Haykal , Haris Abdul , Hadi Abdul 
Published: April 2024

In the practice of oil palm plantation management, land clearing and cultivation using heavy equipment will change soil conditions from anaerobic to aerobic. This condition will cause sulfide compounds contained in the soil, or commonly referred to as pyrite (FeS2) to undergo an oxidation process that can cause the formation of sulfuric acid compounds (H2SO4) which when dissociated will release H+ ions in the soil solution, thus increasing soil acidity. In addition, improved drainage will also lead to a high likelihood of plant nutrients being leached from the soil. On the other hand, the HCV areas will be left unmanaged by maintaining the original vegetation adjacent to the oil palm plantations. So there are two different land management systems between oil palm land and HCV areas which in theory will have different land characteristics, one of which can be seen from differences in soil chemical characteristics. The purpose of this study was to determine the differences in the characteristics of several soil chemical properties including pH, C-organic, Al-dd and P-available in oil palm land and HCV areas. This research is a field research using survey method. Sampling in the field was carried out by purposive sampling at PT Kharisma Inti Usaha, Tapin Regency, South Kalimantan Province. Soil samples used in this study were soil samples at a depth of 0-30 cm and 30-60 cm on oil palm land and HCV areas where each land was taken as many as 10 sampling points, so that the total sample points amounted to 40 sampling points. The results showed that the characteristics of soil acidity (pH), carbon (C-organic), aluminum (Al-dd) and phosphorus (P-available) on oil palm land were lower than HCV areas in PT Kharisma Inti Usaha Tapin Regency.
Pengaruh Pemberian Pupuk Organik Kaya Nitrogen terhadap Sifat Kimia Tanah Podsolik dan Pertumbuhan Tanaman Jagung (Zea mays L.)
Authors: Rusdiana Gusti Mutia , Ifansyah Hairil , Yusran Fadly Hairannoor 
Published: April 2024

Ultisols is the dominant soil type occupies dry land areas in Indonesia. This soil type is a great potential for the development of the agricultural sector in Indonesia. Constraints of physical, chemical, and biological properties of Ultisols must be considered in utilizing for optimal development of agricultural production. This study aimed to determine the effect of inorganic and organic fertilizers in soil pH, exchangeable-Al, CEC, plant dry weight, and N uptake of maize planted on an Ultisols. This research was carried out in February to June 2021 and conducted in a greenhouse and Soil Physics and Chemistry Laboratory, Department of Soil, Faculty of Agriculture, Lambung Mangkurat University. The data obtained from all observed variables were analyzed using orthogonal contrast. The results showed that the application of fertilizer, either inorganic and organic, were able to increase soil pH, but decreased plant N uptake and plant dry weight. The application of inorganic fertilizers increased soil pH more than the application of organic, but the N uptake and dry weight of plants increased more due to the application of organic fertilizers than the inorganic. The application of ZA fertilizer decreased soil pH more than the application of urea, although the changes in exchangeable-Al, CEC, N uptake, and plant dry weight were not different. The application of green manure was able to increase the exchangeable-Al content and reduce the N uptake of plants than the application of manure.
Aplikasi Formulasi Kapur, Bahan Organik dan Pupuk NPK terhadap Kadar Aluminium dan Besi serta Pertumbuhan Jagung di Lahan Pasca-Tambang Batubara
Authors: Hasan Muhammad , Syarbini Muhammad , Priatmadi Bambang Joko 
Published: April 2024

The level of solubility of aluminum and iron metals in the soil is one of the post-coal mining land problems. The high solubility of Al and Fe can be toxic to plants, so that plants are difficult to grow. This study aims to reduce the solubility of Al and Fe using formulations of liming, organic matter, and NPK fertilizer and to examine their effects on the growth and height of corn in post-coal mining land. The study used a Completely Randomized Design (CRD) with a single factor of ameliorant formulation. The treatment consisted of 10 treatments and was repeated three times, so there were 30 experimental units. The results showed that the application of ameliorant formulation of liming, organic matter, and NPK fertilizer had an effect on decreasing the solubility of Al and Fe in the soil and increasing the growth of corn in post-coal mining land. Soil that has been applied with K1 treatment (lime 3 t ha-1) can give the best results in reducing the solubility of Al and Fe metals in the soil. Application K2 treatment (giving organic matter 10 t ha-1), gave the best results for increasing the growth of corn in post-coal mining land. The best treatment for reducing Al and Fe soluble and increasing plant height growth was found in the treatment of lime 3 t ha-1 + organic matter 10 t ha-1 + NPK fertilizer 50 kg t ha-1, which was 0.42 (me 100g soil-1), 4.48 (ppm) and 108 (cm). The conclusion of this research is that the application of lime formulations, organic materials and NPK fertilizer is able to reduce levels of Al-dd, soluble Fe in the soil and increase the height growth of corn plants. Dolomite is able to reduce Al-dd and Fe-soluble levels. The application of organic and inorganic fertilizers affects the growth of corn height.
Peningkatan pH dengan Pemberian Bahan Organik pada Pengelolaan Air Asam Tambang Menggunakan Metode Passive Treatment
Authors: Pitaloka Titian Okta , Saidy Akhmad Rizalli , Yusran Fadly Hairannoor 
Published: April 2024

Mining is the process of extracting beneficial minerals from the surface of the earth that have an impact on the formation of acid mine drainage (AMD). One method of passive AMD management is passive treatment. This study used the Nested Factorial Experiment Design method. The types of organic matter used were empty fruit bunch oil palm (EFB) and cow dung, with doses of 0 Mg ha-1 (control), 50 Mg ha-1, 100 Mg ha-1, 150 Mg ha-1 and 200 Mg ha-1. Each treatment was three repeats so that 30 units of experimental units were obtained. The pH value of AMD in the untreated (control) reactor was 3.67. The initial reaction (pH) of AMD (0 days) with EFB application at a dose of 50 – 200 Mg ha-1 ranged from 3.63 – 4.28 and the initial pH of cow dung was 3.84 – 4.13. The reaction (pH) of the 1st to 4th weeks of AMD after adding EFB organic matter at a dose of 50 – 200 Mg ha-1 show a pH range (6.38 – 7.59) and cow manure at a dose of 150 – 200 Mg ha-1 show a pH (6.09 – 7.01). The conclusion are that the application of EFB organic matter on constructed wetland media for 4 weeks had a very real effect on increasing the pH of the AMD dose of 100 – 200 Mg ha-1 while cow dung 150 – 200 Mg ha-1 are the most effective against increasing pH.
Kemasaman Tanah dan Sebaran Senyawa Pirit pada Berbagai Kedalaman Tanah Pasang Surut
Authors: Maulidi Muhammad Zakir , Mariana Zuraida Titin , Priatmadi Bambang Joko 
Published: April 2024

Soil acidity (pH) is the main obstacle in tidal swampland. The high soil acidity (pH < 4.0) causes an increase in the solubility of iron (Fe). The high soil acidity affects the balance of chemical reactions in the soil and the availability of nutrients in the soil. The purpose of this study was to determine soil acidity (pH), redox potential (Eh), and soluble Fe at at varying soil depths with different pyrite locations in tidal swampland. This study used a nested design and studied the following factors: 1) Depth of pyrite 0-50 cm layer (actual acid sulfate soil) and 50-100 cm layer (potential acid sulfate soil). 2) Soil depth includes 0-25 cm, 25-50 cm, 50-75 cm, and 75-100 cm. Soil samples were taken at the depth where pyrite was detected, with 3 replicates at each soil depth. This resulted in a total of 24 experimental units. The depth of the nested soil coincided with the depth of the pyrite. The study analyzed the acidity of acid sulphate soil, redox potential, and dissolved Fe at pyrite locations within soil depths of 0-100 cm and 0-25 cm, 25-50 cm, 50-75 cm, and 75-100 cm. The results indicate that there was no significant difference in the measurements between the various soil depths of 0-50 cm and 50-100 cm.
Pengaruh Kombinasi Pupuk Kandang Ayam dan Ekstrak Kompos Ampas Kopi terhadap Sifat Kimia Tanah Ultisol
Authors: Dayah Nor , Priatmadi Bambang Joko , Ifansyah Hairil 
Published: April 2024

Ultisol has problems such as soil acidity <5.5, high Al saturation >42%, low organic matter <1.15%, low nutrients such as 0.14% N, P 5.80 ppm, and low base saturation < 35%. Chicken manure is an organic material that alters soil pH and increases total N, total P, and P uptake. Coffee grounds can increase pH, N nutrients, organic matter, available P, prevent fungal growth. The purpose of this study was to determine the effects of feeding chicken manure and coffee grounds compost extract in increasing pH, increasing N availability, decreasing exchangeable Al, and increasing P availability of Ultisol. The research method used was a one-factor Completely Randomized Design (CRD). Factors tested were chicken manure, coffee grounds compost extract, and a combination of the two up to five treatments. K0 = Control, no chicken manure and coffee grounds compost extract; K1 = Coffee grounds compost extract 4 kL ha-1; K2 = Chicken manure 2 tons ha-1; K3 = Chicken manure 2 tons ha-1 + coffee grounds compost extract 4 kL ha-1; K4 = Chicken manure 4 tons ha-1 + coffee grounds compost extract 8 kL ha-1. Each treatment was replicated four times for 20 experiments. The results showed that the application of chicken manure and coffee grounds compost extract decreased soil pH, and soil exchangeable Al and increased soil ammonium, nitrate and available P levels.
QUANTITATIVE PHYTOCHEMICAL ANALYSIS OF MAULI BANANA STEM AND BASIL LEAVES EXTRACT MIXTURE
Authors: Namira Aghnina A.M. Della , Puspitasari Dewi , Wasiaturrahmah Yusrinie 
Published: April 2024

Background: Mauli banana stem extract and basil leaves extract are ingredients that has been involved in in vitro and in vivo researches for their pharmacognosy and therapeutic applications. Preliminary phytochemical test of both individual extract revealed the presence of triterpenoid, tannin, phenolic, saponin, steroid, alkaloid, and flavonoid compound. A combination of mauli banana stem and basil leaves extract is believed to work synergistically and may have a more beneficial effect than in single herbal extract. Purpose: To analyze the results of quantitative phytochemical of mauli banana stem and basil leaves extract mixture. Method: Non-experimental research with quantitative laboratory examination to determine sample content. Results: The result showed that mauli banana stem and basil leaves extract mixture contain triterpenoid (30%), saponin (24,75%), flavonoid (15%), alkaloid (22%), phenolic (8%), steroid (4,62%), and tannin (0,03%). Conclusion: Mauli banana stem and basil leaves extract mixture correlated with an increase in majority of the bioactive compound compared to the single extract and would serve as a promising source for phytomedicine. The bioactive compound with the highest content was triterpenoid with 30%, while the lowest was tannin with 0,03%. Keywords: Basil leave extract, Mauli banana stem extract, Quantitative phytochemical test
ANTIBACTERIAL EFFECTIVENESS OF RAMBAI (Sonneratia Caseolaris) LEAVES EXTRACT AGAINST STREPTOCOCCUS MUTANS
Authors: Nor Rahmatika Aniqah , Aspriyanto Didit , Ichrom Nahzi Muhammad Yanuar 
Published: April 2024

Background: The 2018 Riskesdas data stated that dental caries prevalence in Indonesia was 88.8%. Dental caries is a multifactorial disease characterized by hard tissue damage to the enamel, dentin, and cementum of the teeth. One of the causes of caries is the presence of a microorganism called Streptococcus mutans. Rambai leaf extract (Sonneratia caseolaris) is a typical plant of South Kalimantan with content flavonoids, tripernoids, tannins, phenols, steroids that have antibacterial properties against the growth of Streptococcus mutans which can prevent caries. Purpose: To determine the difference in the effectiveness of the antibacterial extract of rambai leaves (Sonneratia caseolaris) against bacteria Streptococcus mutans in vitro. Methods: This research was a true experimental with a post-test-only design and a control group, using six treatment groups, namely 20%, 40%, 60%, 80%, positive control (povidone iodine 1%), and negative control (aquadest) respectively. Each treatment got 3 repetitions. The antibacterial test method used in this study was the liquid dilution method to determine the Minimun Inhibitory Concentration (MIC) by using Spectrophotometer and solid dilution to determine the Minimum Bactericidal Concentration (MBC) by using tools Colony Counter. Results: Based on the results and data analysis, it can be seen that the rambai leaf extract has a MIC of 20% and a MBC of 60%. Conclusion: Rambai leaf extract (Sonneratia caseolaris) can inhibit and have antibacterial activity against the growth of Streptococcus mutans. Keywords: Antibacterial, Rambai leaf extract, Streptococcus mutans
COMPRESSIVE STRENGTH OF Ca(OH)2 COMBINED WITH MUSA ACUMINATA AS A PULP CAPPING MATERIAL
Authors: Wardhana Agung Satria , Hidalgo Andres Migael , Puspitasari Dewi , Erlita Isyana , Sitepu Alexander 
Published: April 2024

Background: The weakness of Ca(OH)2 is its low compressive strength and mechanical properties which can affect the stability of the material to the liquid in the tooth root canal so that it can dissolve the root canal medicament material. Due to the various weaknesses of Ca(OH)2, the researchers are interested in combining Ca(OH)2 with natural ingredients extracted from Musa acuminata (Mauli Banana) stem. Musa acuminata stem extract (MaSE) contains bioactive compounds such as tannins, saponins, alkaloids, flavonoids and lycopene which have antioxidant, anti-inflammatory, antibacterial and anti-viral properties. One of the requirements for pulp capping material is to have sufficient compressive strength, therefore, it is necessary to conduct research to test the value of the compressive strength of the combination of Ca(OH)2 with Musa acuminata stem extract. Purpose: To analyze the compressive strength of the pulp capping material from the combination of calcium hydroxide and Musa acuminata stem extract, with a ratio of 1:1; 1:1.5 ; and 1.5:1. Method: This research is a pure experimental study with a posttest-only design with a control group design, consisting of 4 treatment groups, including: group 1 the combination of Ca(OH)2 with Musa acuminata stem extract at 1:1, group 2 1:1.5, group 3 1.5:1, and group 4 as a positive control. Results: One Way Anova test (p<0.05) which means there is a significant difference. Data analysis was continued with the LSD Post Hoc test (p<0.05) which showed that there were significant differences between groups, between each treatment group. Conclusion: The combination of Ca(OH)2 with 50% MaSE and PG ratio of 1.5 : 1 : 0.375, has the highest compressive strength (1.40 MPa), so it can be concluded that the more Musa acuminata stem extract in the combination, the lower the compressive strength. Keywords : Calcium hydroxide, Compressive strength, Musa acuminata stem extract