bluuebunny/crossref_metadata_2025 huggingface dataset:
Wykorzystanie metody radaru penetrującego grunt w badaniu gleby zanieczyszczonej węglowodorami w obszarze Navodari - Rumunia
Authors: Sorin Anghel
Published: June 2024

Ground penetrating radar (GPR) is a very useful geophysical method for use in hydrogeologic and near-surface mapping studies. It can be used to study contaminants in groundwater, subsurface faulting, and underground cavities (natural or man-made), all of which pose potentially dangerous geological hazards. The GPR technique is similar in principle to seismic reflection and sonar techniques. The propagation of the radar signal depends on the frequency-dependent electrical properties of the ground.Electrical conductivity of the soil or rock materials along the propagation paths introduces significant absorptive losses which limit the depth of penetration into the earth formations and is primarily dependent upon the moisture content and mineralization present.Reflected signals are amplified, and transformed to the audio-frequency range, recorded, processed, and displayed. From the recorded display, subsurface features such as soil/ soil, soil/rock, and unsaturated/saturated interfaces can be identified. In addition, the presence of floating hydrocarbons on the water table, the geometry of contaminant plumes, and the location of buried cables, pipes, drums, and tanks can be detected. The GPR data are presented as a two-dimensional depth profile along a scanned traverse line in which the vertical axis is two-way travel time measured in nanoseconds. The location of hydrocarbon contamination in the ground using the GPR method is based mainly on information taken from reflected signals. In the cases investigated in Romania contaminated sites (Navodari area), such signals were very rarely recorded. A long time after spillage, contamination takes the form of plumes with different size and distribution, which depends on the geological and hydraulic properties of the ground. The survey discussed in this paper was carried out using the GPR system-Noggin with two antennas (250 and 500mHz) Data collected were processed using software(EKKO_Project™ GPR Data Analysis) to produce 2D radargram in time scale. The presence of contaminant plumes as well as the water table are observed in the GPR sections at depths approximately of 0.5 to 1.5 m. In the GPR section, the oil contaminated layer exhibits discontinuous, subparallel, and chaotic high amplitude reflection patterns. Promising results were also obtained in the GPR survey where three obvious reflection patterns representing the top sand-silt layer, oil-contaminated zone and, the underlying thick soft clay were detected in all 2D radargrams of the GPR traverse lines.
Stabilność struktury gruzińskiego naturalnego heulandytu
Authors: Tsitsishvili Vladimer , Dolaberidze Nanuli , Mirdzveli Nato , Nijaradze Manana , Amiridze Zurab , Amiridze Zurab , Khutsishvili Bela
Published: June 2024

Zeolites have a unique set of molecular-sieve, sorption, ion exchange and catalytic properties due to their framework microporous structure, and structural stability is an important characteristic and often a decisive factor in the application and performance of natural zeolites. The aim of our work was to study the processes occurring under the influence of heat, which determine the thermal stability of the zeolite-containing tuff of the Tedzami-Dzegvi deposit, with zeolite phase content up to 90%, consisting of heulandite and chabazite in a ratio of 8:1, and chemical composition |Na0.25K0.06Ca0.19Mg0.15|[AlSi3.6O9.2].3H2O. It was found that as a result of exposure to heat, a slight dealumination of the surface of the calcined (400-500 °C) samples occurs, as well as dehydration and amorphization of the crystal structure are observed. Sample dehydration occurs in several stages: (i) most of the water (≈60% of the total water content) is continuously lost at temperatures below ≈250 °C, (ii) the part of the remainder (≈24%) is slowly dehydrated up to 650 °C, (iii) complete dehydration of the sample is achieved at ≈800 oC. Amorphization of the heulandite phase begins at temperatures above 200 °C, the transition to the metastable heulandite B phase at ≈340 oC is not fixed, but at high temperatures wairakite or another mineral of the 9.GB.05 group and quartz are formed; the chabazite phase is stable up to ≈1000 oC, and at temperatures above 1100 oC, leucite (K,Na)AlSi2O6 and cristobalite SiO2 are formed. The adsorption of water vapor and benzene on heat-treated samples decreases monotonically with an increase in the calcination temperature, following amorphization. Nitrogen adsorption-desorption isotherms show slight decrease of the absorbent surface area with an increase in the calcination temperature and nonmonotonic changes in average mesopore diameters. It is also shown that heat treatment improves the acid resistance of heulandite by reducing dealumination after sample treatment with hydrochloric acid.
Podejście do jakości wody w zlewni osadzonej w krajobrazie rolno-leśnym nieznacznie zdegradowanym przez działalność rolniczo-hodowlaną
Authors: Rodríguez-Blanco M. Luz , Taboada-Castro M. Teresa , Taboada-Castro M. Mercedes
Published: June 2024

The headwater streams constitute landscapes with their own entity and are strongly influenced by their environment. They have a large impact on health and integrity, both for water quality and wildlife downstream. Studies on water quality from atlantics agroforestry catchments are scarce. Knowledge about water quality in agroforestry headwater catchments is important for assessing downstream effects and as a baseline for net impacts of land-use change. We analyzed physicochemical water variables of a headwater stream framed in a rural-agroforestry catchment with very little agricultural area, low livestock density and very little human population in NW Spain. Stream water samples were collected at the catchment outlet at approximately biweekly intervals over three years. All water samples were analyzed for the following quality parameters: pH, water temperature (T), electrical conductivity (EC), dissolved oxygen (DO), chemical oxygen demand (COD), major cations (Ca, Mg, Na, K), anions (Cl, SO4), nutrients [total dissolved carbon (TDC), dissolved organic carbon (DOC), nitrites nitrogen (NO2-N), nitrate nitrogen (NO3-N), ammonium nitrogen, Kjeldahl nitrogen (KN), total nitrogen (TN), dissolved, particulate and total phosphorus (DP, PP, TP)], and suspended solids (SS). Discharge was also measured. The mean concentrations of major anions, cations and different forms of carbon, nitrogen and phosphorus were rather low compared to global “average” values. Overall, the mean values of the main physicochemical water quality indicators offers similar values to those found in other rural catchment in humid temperate climates with low agricultural activity and demography, although such concentrations could have been underestimated as they mostly correspond to regular sampling and therefore ignore the influence of rainfall-runoff events.
Projektowanie zakładu uzdatniania wody przy wsparciu modeli laboratoryjnych
Authors: Mecir Filip , Kucera Tomas , Zelinova Kristina , Travnicek Jakub
Published: June 2024

The subject of the research focused on the possibilities of supporting the design of surface water treatment plants using laboratory models. Within the pilot study, the possibilities of using different water treatment processes in the treatment of water from the water reservoir Nové Mlýny in the Czech Republic were assessed. The planned treatment plant is to supply a future recreational site from a shallow reservoir with significant eutrophication and chemical industry in the drainage basin. Coagulation, sedimentation, dissolved air flotation, membrane filtration processes and adsorption on granular activated carbon were investigated. These processes were identified by the preliminary study as applicable to water treatment and it was necessary to determine which could be applied given the site conditions. Laboratory models for the individual processes were used during the laboratory testing. During the research, problems encountered were debugged and the models were modified and some extensions were added to the original models. The coagulation and sedimentation processes were investigated using conventional jar tests. The dissolved air flotation process was simulated using a modified jar test and a lab scale model. Different types and doses of coagulants, mixing parameters and residence times were investigated in the tests. Turbidity value was used as an optimization parameter due to its rapidity of determination and low cost. For some tests, potassium permanganate oxidizability (also known as the permanganate index) was also used as an evaluation parameter so that different evaluation parameters could be compared. In addition, for the dissolved air flotation process, the parameters of the produced sludge - its quantity, suspended solids content and chemical oxygen demand - were monitored. These parameters are crucial for discharge of waste water into the sewer and its costs. The adsorption tests on granular activated carbon were performed as batch tests. The evaluation parameter was the manganese index. Another possible variant of activated carbon tests is a continuous flow-through column. These columns also allow monitoring of the process of fouling and the evolution of the effluent over time. The pilot project then used the results of the laboratory tests to create a design for a treatment plant in the area of interest and selected parts of the project documentation. The pilot project demonstrated the usefulness of laboratory testing as a tool to support the design of drinking water treatment plants. At the same time, these tests allow for a faster and more certain identification of the appropriate water treatment technology and thus reduce the extent of semi-operational testing at the site, leading to a more efficient use of funds by investors.
Właściwości palne kompozytów epoksydowych wzmocnionych włóknem konopnym
Authors: Koyuncu Menderes
Published: June 2024

In this study, the behavior of hemp fiber/epoxy composites subjected to flammability properties. for the production of composite samples, hemp reinforcements were used: unidirectional two balanced laminates (00/900) different in thickness were studied: 2 plies, 4 plies. The composites were fabricated by hand lay-up process the flammability properties of composites are analyzed by using UL-94. The effects of two different fire retardant compounds (Magnesium hydroxide and Aluminum hydroxide) filling on the Underwriters Laboratories (UL)-94 horizontal and vertical tests were carried out for evaluating the effectiveness of these FR treatments. The effects of 2 - 4% Mg (OH)2 and Al (OH)3 loading on the composites' burning rate was studied. It was seen that the composite results of vertical burning tests classified these composites under No Classification. The rate of burning of the composites decreased with the inclusion of fire retardants and the rate of burning of 11,60 and 11,22 and 12,20, and 10,60 mm/min was found with 4% wt of Mg(OH)2 and Al(OH)3 in composites respectively.
Reakcje foraminiferałów na zmiany poziomu morza na granicy środkowego karbonu w środkowych Taurydach (Turcja)
Authors: Atakul-Özdemir Ayşe , Altıner Demir , Özkan-Altıner Sevinç
Published: June 2024

The response of benthic foraminiferal assemblages to relative sea-level changes during the mid-Carboniferous succession of the Yarıcak Formation in the Central Taurides is assessed with respect to sedimentary cyclicity and sequence stratigraphy by quantitative analysis. The data derived from the relative abundances of foraminifera have critical significance in the understanding of cyclic patterns and sea level changes in carbonate deposits. Calcareous foraminiferal groups including archaediscids, eostaffellids, irregularly coiled bilocular forms, unilocular forms, paleotextularids, biseriamminids, endothyrids, and pseudoendothyrids have been counted and analysed in this study. The mid-Carboniferous boundary succession predominantly covering uniform lithology of carbonates alternated with sandstone layers involves shallowing upward cycles used for the revealing of sea-level fluctuations. The relative abundances of these foraminiferal groups reveal a striking response to cyclicity with the reductions in the abundances towards the upper part of the cycles. Conversely, the abundances of pseudoendothyrids and endothyrids do not exhibit any considerable variations within the studied interval.
Modelowanie hydrologiczne jako wsparcie dla projektowania i utrzymania infrastruktury
Authors: Uciechowska-Grakowicz Anna , Chrobak Grzegorz , Dąbrowska Jolanta
Published: June 2024

One of the many concerns related to climate change is its impact on infrastructure, for example in the case of structures such as bridges or culverts which are more frequently exposed to conditions like significant differences in water table levels or floods. Varying weather conditions can also cause deterioration of properties of the materials which they are made of, which coupled with higher loads (water, wind or temperature variation, depending on the structure) decreases their durability and hinders their operation. Existing infrastructure facilities were designed with the use of historical data, and those design assumptions can be out of date at the moment, moreover their validity decreases with further climate changes. In order to support the design of new infrastructure facilities and the maintenance of already existing ones, climate change should be taken into account. One of the means that can be used to assess the impact of climate change on bridges and other river infrastructure is hydrological modelling. In this paper, the authors present a hydrological model of the flow in the Ślęza River, a 78.6 km long, left- bank tributary of the Odra River, as well as in its tributaries, with a particular focus on the points where bridges are located. The model was performed with QSWAT software, taking into account two scenarios of climate change: SSP2-4.5 and SSP5-8.5 (obtained with the use of NorESM2-LM model) and calibrated with the use of historical meteorological data. The results of the model include daily flows for years 2023-2050, which allows to compare characteristic (statistical) flows and observe trends; also a change in the dynamics of the river caused by thaws can also be observed. A greater number of extreme events can be seen in the results for the SSP2-4.5 scenario, the values of flood flows are also higher for this scenario, whereas the average flows are higher for the SSP5-8.5 scenario, which is due to higher rainfall in this scenario – although the threat of short-term extreme events is lower, but nevertheless, due to increased flows, scouring development can occur in this scenario, which when left uncontrolled can pose great risks to bridges. The obtained results would be helpful for engineers who plan the maintenance of infrastructure facilities, as this analysis would provide additional data in order to choose optimal solutions for the costs of exploitation and for the environment.
Poprawa zdolności sorpcyjnej i zastosowania biosorbentu poprzez immobilizację
Authors: Hroncova Jana , Luptakova Alena , Briančin Jaroslav , Kupka Daniel
Published: June 2024

The water contamination by toxic metal ions is a worldwide environmental problem. High concentrations are hazardous for all living organisms, causing many disorders and diseases and ecological damages to the surroundings. Biosorption is an innovative technology that employs inactive and dead biomass (bacteria, fungi, algae, biowaste) for the recovery of metals from aqueous solutions. Sulphate-reducing bacteria utilization is one of the options how to prepare applicable sorbent which removes metal ions from water. This material is created as a consequence of bacteria metabolism in anaerobic environment. The use of freely suspended biomass is often impractical and has some disadvantages. In contrast to this, application of immobilized biomass shows more benefits including increased mechanical strength, resistance to chemical environment, easy separation of cells and effluents, high biomass performance and repeated use in many adsorption/desorption cycles. Cell entrapment is the most widely used method for immobilization. In this technique, the cells are enclosed in a polymeric matrix which is porous enough to allow diffusion of substrate to the cells. The aim of this work was to examine and compare the sorption ability of biogenic iron sulphides created by sulphate-reducing bacteria in “free” and “entrapped” form. Precipitates were synthesized in reagent bottles with bacteria culture and growth media Postgate C, at 30 °C during 60 days, subsequently dried and analysed. Prepared samples were immobilized using sodium alginate. Sorption of cadmium from model solutions was realized in 100 ml Erlenmeyer flasks, with sorbent dose 1 g/l, during 24 hours. During experiments, the samples showed a satisfying stability and maximum adsorption capacity achieved 38 mg/g. The results refer to good sorption properties of immobilized samples and their potential for further practical use.
Sezonowa i przestrzenna zmienność jakości wody w systemie jezior Lumina-Rosu w delcie Dunaju w Rumunii
Authors: Catianis Irina , Constantinescu Adriana Maria , Grosu Dumitru , Lupascu Naliana , Iordache Gabriel , Dutu Florin
Published: June 2024

The main aim of the present scientific paper is to assess water quality of the surface water of various lakes located in the Lumina-Rosu interdistributary depression, Danube Delta, Romania. As specific objectives, the paper considered to spot the main potential sources of contamination and their environmental impacts on aquatic ecosystems. Equally, the purpose of the article is to emphasize the importance of monitoring the water quality of the Danube Delta, for preserving these unique natural water resources and their ecosystem services (fresh water, biodiversity, flood control, recreation, nutrient cycling, fishing and other traditional activities, ecotourism). Surface water samples collected from several control sections situated on the main tributaries and canals, as well as from lakes were investigated physically (To - C, EC - μS/cm, TDS - mg/L, turbidity - NTU units, TSS - mg/L) and chemically (pH - units, DO - mg/L, N-NO2- - mg/L, N-NO3- - mg/L, P-PO43-- mg/L, Chla - mg/L, SiO2 - mg/L, TOC - mg/L, SO42- - mg/L, S2- - mg/L, H2S - mg/L and synthetic detergents - mg/L). Generally, the hydro-physical-chemical characteristics and water quality assessment of the surface waters of the lakes manifest the combined effect of both processes occurred in the catchment (weathering, sediment supply and transport), as well as the in situ lake processes (photosynthesis, sediment mixing, biogeochemical cycling, evaporation, eutrophication, productivity changes). Overall, the physical and chemical characteristics of the sampling sites investigated at high waters of the Danube are quite similar to those measured at low waters. The differences that mainly occurred within the lakes are more related to the limnological variables and the local environmental conditions. Anyway, a significant seasonal variation was noticed in the lakes, during the dry period, when different physical and chemical characteristics appeared to be influenced by high air temperature, lack of precipitation, low water level regime, low dissolved oxygen level regime, all related to climate change effects etc. Moreover, the anthropogenic factor that left its mark on some physical-chemical characteristics of water should not be omitted either. However, the results obtained within this study did not show such alarming values as might have dangerous effects on the investigated aquatic environments. The water quality information within this case study may be used for improving the understanding of the water quality issues and to better coordinate and plan for future monitoring activities in and around the Danube Delta environment. The results will contribute to updating the existing database with relevant information for a sustainable future of the Danube Delta and in similar areas that are subjected to such environmental challenges.
Wpływ zastosowania uzdatniaczów gleby na temperaturę i wilgotność środowiska glebowego
Authors: Jeřábková Jindřiška , Salaš Petr , Burgová Jana
Published: June 2024

In cities, environmental and social impacts are increased every year due to high temperatures due to the heat island of the city. An effective struggle against the heat island of the city is the green infrastructure, where woody plants such as trees and shrubs play an irreplaceable role. Wood in the city is affected by a number of stress factors, especially high temperatures and lack of precipitation. In order for them to perform all their important functions and help reduce the negative impacts of the city's heat island, all requirements for their successful development and growth must be fulfilled. Soil conditions are an important factor affecting the condition of trees. Unsuitable soil conditions which include lack of water, compacted soil, result in insufficient development of the root system which directly affects the quality of the above-ground part of the plants. A possible treatment to improve the soil environment in the root zone of trees is the use of soil conditioners applied in the form of soil injection. The paper deals with the effect of soil conditioners (Hydrogel®, mycorrhizal mix Endomyk PROF + Trichoderma, and their combination) in the form of injection on the temperature and humidity conditions of the soil environment in a young plants of trees (species) Acer campestre L. in the city of Znojmo (South Moravia region). Plants without application of any preparation served as a Control variant. Before the actual application of conditioners MINILOG data loggers with temperature sensors and VIRRIB moisture sensors were placed in the soil which recorded changes in soil temperature and volumetric soil moisture in six-hour intervals every day in the period from February 2021 till December 2022. These changes were recorded in two profiles 0.1 - 0.4 and 0.4 - 0.7 meters. From the recorded results, it can be said that the application of soil conditioners had a significant effect on the temperature and humidity conditions of the soil environment. The variant with the soil conditioner Hydrogel® and the variant with the soil conditioner Hydrogel® in combination with the mycorrhizal mix in most cases show higher values of soil moisture and temperature compared to the Control variant. This trend is most evident in the soil profile of 0.4 - 0.7 m in the growing season.
Oczyszczanie ścieków z wytłoczyn z oliwek poprzez elektrokoagulację peroksydacyjną z wykorzystaniem arkuszy aluminiowych
Authors: Martins Ramiro José , Tesuka Leticia Harumi , Grabowski Thais Theomaris
Published: June 2024

The extraction of olive pomace oil is a significant aspect of the edible oil industry in Mediterranean regions where olives are widely cultivated. The resulting wastewater generated from this industry is known to harbor pollutants, including residual solvents, oils, and chemicals from the refining process, that can have adverse effects on the environment and public health. Peroxy-electrocoagulation (PEC) is a method that can be used to treat wastewater from the olive pomace oil extraction industry. The purpose of the work was to reduce the concentration of pollutants in the effluent through the use of PEC with aluminum electrodes as a method of treatment. The Box-Behnken Design was used to study the relationship between hydrogen peroxide dosage (10, 20, and 30 g L-1), electric current density (5, 20 and 35 mA cm-2), and the initial pH (2.5, 3.5, and 4.5), in the PEC process, and the removal of chemical oxygen demand (COD) and total phenolic compounds (TPh). The highest removal was obtained with hydrogen peroxide dosage of 30 g L-1, and 20 mA cm-2, and with 29% of TPh removal at pH 2.5, and with 84% COD removal at pH 4.5. The procedure removed an average of 22% COD and 82% TPh. The concentration of hydrogen peroxide was one of the most significant factors in the process. Pre-treatment with other techniques is necessary to reduce harmful elements in the effluent before undergoing biological treatment.
DETERMINAN KINERJA SISTEM INFORMASI AKUNTANSI DI LPD KECAMATAN GIANYAR
Authors: Ernawatiningsih Ni Putu Lisa , I Ketut Sunarwijaya
Published: June 2024

Kinerja lembaga keuangan sangat ditentukan oleh kinerja sistem informasi akuntansinya, karena akan menghasilkan laporan keuangan yang berkualitas. Tujuan penelitian ini adalah untuk menguji dan menganalisis pengaruh variabel pemanfaatan teknologi informasi, kepemimpinan, pendidikan dan pelatihan, budaya organisasi, dan pengalaman kerja terhadap kinerja sistem informasi akuntansi pada Lembaga Perkreditan Desa di Kecamatan Gianyar. Sampel penelitian ini berjumlah 78 karyawan yang diidentifikasi menggunakan metode purposive sampling. Metode analisis data yang digunakan dalam penelitian ini adalah analisis regresi berganda. Penelitian ini memperoleh hasil bahwa pendidikan dan pelatihan, budaya organisasi, dan pengalaman kerja berpengaruh positif terhadap kinerja sistem informasi akuntansi, sedangkan penggunaan teknologi informasi dan kepemimpinan tidak berpengaruh terhadap kinerja sistem informasi akuntansi.
Pemecahan Masalah Program Linier Mahasiswa Pendidikan Matematika dengan Kemampuan Number Sense Tinggi
Authors: Arjudin Arjudin , Kurniati Nani , Turmuzi Muhammad , Wulandari Nourma Pramestie
Published: June 2024

Pemecahan masalah (problem solving) dalam matematika termasuk kemampuan mendasar dan fundamental yang harus dikuasi oleh seseorang. Namun, penelitian terdahulu menunjukkan bahwa kemampuan pemecahan masalah mahasiswa masih cenderung berada pada kategori sedang dan rendah. Banyak faktor yang dapat menyebabkan rendahnya kemampuan pemecahan masalah mahasiswa tersebut diantaranya yakni faktor kemampuan number sense. Tujuan dari penelitian ini adalah untuk mendeskripsikan pemecahan masalah program linier mahasiswa pendidikan matematika dengan kemampuan number sense tinggi. Penelitian ini merupakan penelitian kualitiatif deskriptif dengan melibatkan 36 mahasiswa Program Studi Pendidikan Matematika tahun ketiga yang telah mengambil mata kuliah program linier. Instrumen yang digunakan yakni soal tes kemampuan number sense, soal tes pemecahan masalah, dan pedoman wawancara. Hasil penelitian ini diperoleh informasi bahwa terdapat 6 mahasiswa berkemampuan number sense tinggi yang seluruhnya hanya mencapai kategori sedang dalam melakukan pemecahan masalah. Secara umum, mahasiswa dengan kategori ini tidak menuliskan informasi mengenai kendala masalah program linier dengan lengkap pada tahap mengumpulkan informasi. Di samping itu, mahasiswa juga tidak melakukan tahap memeriksa kembali pada penyelesaian masalah karena merasa sudah yakin dengan jawaban yang diberikan. Namun penyelesaian tersebut belum tepat.
Pengembangan E-LKPD pada materi Segitiga Melalui Eksplorasi Bangunan Rumah Bari Pangkalan Balai
Authors: Wulandari Ayu , Afgani Muhammad Win , Komarudin Komarudin
Published: June 2024

Penelitian ini bertujuan menghasilkan E-LKPD pada materi segitiga melalui eksplorasi bangunan rumah bari Pangkalan Balai yang valid dan praktis. Jenis dari penelitian ini adalah Research and Development menggunakan model pengembangan Tessmer. Prosedur penelitian memfokuskan pada tahap preliminary dan tahap prototyping menggunakan alur Formative Evaluation.  Pada tahap prototyping menggunakan alur formative evaluation dilakukan tahap self evaluation, expert review, one to one, small group, dan field test. Data kevalidan diperoleh dari lembar validasi beserta komentar dan saran dari para validator pada tahap expert review, selanjutnya kepraktisan diperoleh dari hasil angket dan wawancara pada tahap one to one, small group, dan field test. Subjek penelitian ini adalah peserta didik kelas VII SMP Negeri 2 Sembawa. Hasil penelitian menunjukkan bahwa E-LKPD yang dikembangkan memenuhi kategori kevalidan mencapai 86% dengan kategori sangat valid serta memenuhi kategori kepraktisan mencapai 92% dengan kategori sangat praktis, sehingga disimpulkan E-LKPD pada materi segitiga melalui eksplorasi bangunan rumah bari Pangkalan Balai dinyatakan valid dan praktis.
Mapping of Flood Prone Areas in West Lombok Based on Analytic Hierarchy Process and Geographic Information System
Authors: Nuzla Af’idatur Robbaniyyah  , Syechah Bulqis Nebulla , Naoval Husni  , Marwan  , Lailia Awalushaumi
Published: June 2024

The development and management of flood-prone information systems is needed by many parties, especially the public. In this research, the Analytic Hierarchy Process (AHP) presents an approach to detecting flood-prone areas by combining it with a Geographic Information System (GIS). AHP analysis is used to determine the weight and value of each assessment criterion, and then the results are integrated into the GIS system to produce a flood forecast map. The results obtained show that mapping of flood-prone zones can be carried out rationally and consistently based on AHP by considering four criteria, namely land use, soil type, slope, and rainfall. The results of the analysis of the zoning map show that the areas with a high level of flood vulnerability are on the north and west sides. The area around the Lembar port has a high level of vulnerability. Eyat Mayang Village also has a high level of vulnerability. Locations with a high level of flood vulnerability, caused by flooding through rivers located not far from the sea estuary.
Pengembangan Modul Ajar Berbasis Etnomatematika pada Materi Bangun Datar untuk Peserta Didik Kelas V SD/MI
Authors: Azizah Irsya , Karim Karim , Suryaningsih Yuni
Published: June 2024

Pembelajaran matematika khususnya pada konsep geometri lebih banyak menyajikan contoh atau model bangun geometri baik bangun datar maupun bangun ruang yang kurang relevan dengan kehidupan peserta didik, sehingga pembelajaran matematika kurang bermakna. Untuk memberikan pembelajaran matematika yang bermakna, pembelajaran yang bersifat abstrak harusnya dibantu oleh media yang mengkonkritkan keabstrakan tersebut. Salah satu terobosan pembelajaran matematika bagi guru adalah mengembangkan pembelajaran matematika berbasis etnomatematika. Modul ajar berbasis etnomatematika diharapkan dapat menjadi sarana untuk meningkatkan pemahaman peserta didik akan materi dan mengenalkan budaya lokal. Tujuan dari penelitian ini adalah untuk menghasilkan modul ajar berbasis kurikulum merdeka pada materi bangun datar untuk peserta didik kelas V SD/MI yang valid, efektif dan praktis. Metode penelitian yang digunakan adalah pengembangan yaitu Research and Development (R&D) menggunakan model pengembangan Plomp yang terdiri dari tahap investigasi awal, tahap desain, tahap realisasi/konstruksi, dan tahap tes, evaluasi dan revisi. Teknik analisis data menggunakan instrument validasi, tes evaluasi akhir pembelajaran, dan angket respon guru serta peserta didik. Berdasarkan hasil penilaian dari validator diperoleh nilai 3,76 dengan kategori valid. Berdasarkan hasil tes akhir pembelajaran yang telah dianalisis diperoleh nilai 88,89% dengan kategori sangat efektif. Berdasarkan hasil angket respon guru yang telah dianalisis diperoleh nilai 95,83% dengan kategori sangat praktis dan hasil angket respon peserta didik yang telah dianalisis diperoleh nilai 87,19% dengan kategori sangat praktis. Dengan demikian, modul ajar berbasis kurikulum merdeka pada materi bangun datar untuk peserta didik kelas V SD/MI dapat dinyatakan valid, efektif, dan praktis.
Pengaruh Penerapan Model Problem Based Learning Terhadap Kemampuan Pemecahan Masalah Teorema Pythagoras Pada Siswa Kelas VIII SMPN 1 Suralaga Tahun Ajaran 2023/2024
Authors: Aini Rohmiatun , Sripatmi  , Salsabila Nilza Humaira , Baidowi Baidowi
Published: June 2024

Penelitian ini bertujuan untuk mengetahui pengaruh model problem based learning terhadap kemampuan pemecahan masalah teorema pythagoras siswa. Penelitian ini dilaksanakan di SMPN 1 Suralaga tahun ajaran 2023/2024. Jenis penelitian yang digunakan adalah eksperimen semu (quasi experiment). Populasi dalam penelitian ini adalah siswa kelas VIII SMPN 1 Suralaga tahun ajaran 2023/2024. Adapun sampelnya sebanyak 44 siswa yang terdiri dari 22 siswa kelas eksperimen dan 22 siswa kelas kontrol. Teknik pengumpulan data yang digunakan adalah observasi dan tes. Sedangkan instrumen penelitiannya terdiri dari lembar observasi, lembar tes kemampuan pemecahan masalah, rencana pelaksanaan pembelajaran dan lembar kerja siswa. Data diambil dengan uji t, diperoleh hasil    diterima, ada perbedaan kemampuan pemecahan masalah teorema pythagoras pada siswa yang pembelajarannya menggunakan model problem based learning dengan siswa yang menggunakan model pembelajaran langsung. Adapun rata-rata hasil posttest kelas eksperimen lebih tinggi daripada kelas kontrol yaitu . Hal ini menunjukkan adanya pengaruh model problem based learning terhadap kemampuan pemecahan masalah teorema pythagoras pada siswa kelass VIII SMPN 1 Suralaga menggunakan uji effect size diperoleh  yang artinya pengaruh yang diberikan berada pada kategori sedang.
Analisis Kemampuan Pemecahan Masalah Higher Order Thinking Skill (HOTS) Siswa Berdasarkan Gaya Kognitif Field-independent dan Field-dependent
Authors: Satila Susena , Prayitno Sudi , Novitasari Dwi , Baidowi Baidowi
Published: June 2024

Penelitian ini bertujuan untuk mendeskripsikan kemampuan pemecahan masalah HOTS siswa dalam menyelesaikan soal persamaan kuadrat berdasarkan gaya kognitif field-independent dan field-dependent. Jenis penelitian yang digunakan adalah penelitian deskriptif kualitatif. Subjek dalam penelitian ini adalah 6 siswa kelas IX di salah satu Sekolah Menengah Pertama Islam Negeri di kota Mataram yang terdiri dari 3 siswa field-independent dan 3 siswa field-dependent yang dipilih dengan teknik purposive sampling. Pengambilan data dilakukan dengan menggunakan instrumen tes GEFT, soal tes pemecahan masalah HOTS dan pedoman wawancara. Teknik analisis data menggunakan tahapan Miles and Huberman yaitu reduksi data, penyajian data, dan penarikan kesimpulan. Hasil penelitian menunjukan: (1) Siswa dengan gaya kognitif field-independent memiliki tingkat kemampuan pemecahan masalah kategori sangat baik pada tahap memahami masalah, melaksanakan rencana dan memeriksa kembali serta kategori baik pada tahap membuat rencana; (2) Siswa dengan gaya kognitif field-dependent memiliki tingkat kemampuan pemecahan masalah HOTS sangat baik pada tahap memahami masalah, kategori kurang pada tahap membuat rencana, melaksankan rencana dan kategori sangat kurang pada tahap memeriksa kembali.
Efektivitas Metode Brent dalam Penyelesaian Masalah Break Even Point Menggunakan Pemrograman Pascal
Authors: Sujaya Ketut Ary , Sudi Prayitno  , Nani Kurniati  , Nyoman Sridana
Published: June 2024

Model matematika tidak linier dari masalah break even point (BEP) sulit dipecahkan secara analitik untuk mendapatkan solusi eksak, sehingga alternatifnya dipecahkan secara numerik. Tujuan penelitian ini adalah untuk menyelesaikan masalah BEP dengan menggunakan metode-metode numerik dan mengukur efektivitasnya berdasarkan galat dan jumlah iterasi. Semakin kecil galat dan jumlah iterasinya, semakin efektif metodenya. Penelitian ini berjenis terapan yang prosedur pelaksanaannya meliputi persiapan, implementasi, uji program, revisi program, analisis, dan kesimpulan. Metode yang diuji efektivitasnya adalah metode Brent, secant, posisi palsu, dan bagi dua. Masalah BEP tersebut terselesaikan dengan BEP terjadi pada saat 3,22967 tahun. Selain itu, pengujian galat terhadap penyelesaian masalah BEP menggunakan metode-metode tersebut secara berturut-turut adalah 0,00118; 0,00893; 0,64485; dan 0,89119. Sedangkan pengujian jumlah iterasinya secara berturut-turut adalah 52 kali iterasi, 53 kali iterasi, 91 kali iterasi, dan 101 kali iterasi. Oleh karena itu, dapat disimpulkan bahwa metode Brent lebih efektif daripada ketiga metode tersebut.
Ethnomicological Study of Macrofungi in Sesaot Forest of West Lombok
Authors: Sulastri Meilinda Pahriana , Basri Hasan , Andini Arista Suci
Published: June 2024

Communities living near forested areas play a crucial role in preserving forest biodiversity. Ethnomycological studies are an important first step in identifying the variety and potential of macrofungi used by people in a region. This study aims to document the use of macrofungi by the local community around Sesaot forest. The collection and identification of macrofungi samples were carried out using opportunistic sampling. Data on the use of macrofungi was obtained from semi-structured interviews with residents around Sesaot Forest. A total of 26 respondents from the Sesaot community participated in the survey. The people usually collected macrofungi for consumption and occasionally for medicinal purposes. The results identified 12 species of macrofungi from 10 families (Pezizaceae, Auriculariaceae, Sarcoscyphaceae, Gomphaaceaae, Pleurotaceae, Ganodermataceae, Psathyrellaceae, Polyporaceae, Agaricaceae, and Nidulariaceae) in Sesaot forest. Auricularia sp. and Pleurotus sp. were used as food, while Lignosus sp. was used as medicine by the local people in Sesaot.
Analysis of Water Quality Status in the Polluted Porong River Due to Detergent on the Hematological Performance of Java Barb (Barbonymus gonionotus)
Authors: Caesar Nico Rahman , Yanuhar Uun , Faqih Abd. Rahem , Anitasari Septi , Ciptadi Gatot , Musa Muhammad , Bisri Mohammad , Sumsanto Muhammad , Wardani Nezya Pramudya
Published: June 2024

The Porong River is one of the rivers that faces high anthropogenic impacts, such as surfactant waste from detergents. The hematology of Javanese carp (Barbonymus gonionotus) serves as a sentinel organism that can be used as a biomarker for the waters of the Porong River. The aim of this study is to analyze the water quality status of the Porong River polluted with surfactants using the STORET method, as well as its impact on the hematology of Javanese carp using regression and correlation analysis. The research employed a descriptive survey method. The results of the study indicated that the Porong River was categorized as moderately polluted. The average highest surfactant concentration reached 7.2 mg/L, leading to an increase in TSS to 107.95 mg/L and a decrease in DO to 1.80 mg/L. Surfactants exhibited a negative correlation with erythrocytes (91.2%), hematocrit (47.7%), and hemoglobin (60.6%), indicating that the higher the surfactant concentration, the lower the number of erythrocytes, hematocrit levels, and hemoglobin levels in Javanese carp. Conversely, there was a positive correlation between surfactants and leukocytes (56.7%) and blood glucose (66.7%), suggesting that the higher the surfactant concentration, the higher the number of leukocytes and blood glucose levels in Javanese carp.
Development of Interactive Video for the Basics of Educational Technology Course
Authors: Nuari Harfajri , Zen Zelhendri , Hidayati Abna , Ridwan
Published: June 2024

This study aims to evaluate the validity of the interactive video developed for the Basics of Education Technology course. This Research & Development (R&D) study adopts the ADDIE development model, commencing with the analysis and design phases. The subsequent step is the development phase, where data is collected through interviews and questionnaires. Data analysis is conducted to assess the validity of the interactive video across three aspects: content, media, and language. Validators provide both quantitative and qualitative feedback. The results of the validity test indicate a score of 93% from media experts, 85% from content experts, and 95% from language experts. This suggests that each aspect of the interactive video is deemed valid and falls within the highly valid category. Thus, it can be concluded that the interactive video is highly suitable for use as a learning medium for students in the Basics of Education Technology course.
Learning Chemical Bonds in Terms of Identifying Difficulties, Misconceptions, Learning Media, and Learning Models: A Systematic Literature Review
Authors: Yovanie Faira
Published: June 2024

This research aims to determine and describe the identification of difficulties, misconceptions, learning media, and learning models on chemical bonds. The method used in this research is the systematic literature review method. Article search results starting from 2014 to 2024 were selected gradually and systematically. The results of this research show that students' difficulties and misconceptions can be minimized by applying learning models and media. It is evident from several articles studied that they are able to answer research questions, namely: How to identify difficulties in chemical bonds among students? what are the misconceptions that occur in chemical bonds? What are the appropriate learning models for chemical bonds? and What are the appropriate learning media for chemical bonds? The results and findings in several articles show that difficulties and misconceptions in chemical bonds can be minimized by applying learning models and media to reduce misconceptions about chemical bonds.
Android-Based Articulate Storyline Interactive Media in IPAS Subjects
Authors: Masrifah Amilatul , Setyasto Novi
Published: June 2024

The limitations of learning media, especially technology-based, make students passive so they feel bored and less interested in learning. This results in low student learning outcomes. This research aims to develop and test the feasibility, practicality, and effectiveness of Android-based interactive media in the IPAS subject, fifth grade elementary school interaction material. This type of research is developed using the Borg and Gall model. The data collection techniques used are observation, interviews, document data, tests, and questionnaires. The validation results by media expert validators were 91.3% and material experts were 91.2%, so an average of 91.25% met the valid criteria. Based on the pretest and posttest results, it is known that Android-based interactive media is effective in improving student learning outcomes as seen from the effectiveness of the t-test and N-gain tests. The t-test shows that Sig. < 0.05, meaning there is a significant difference between learning outcomes before and after treatment. The N-gain test shows a high criterion, namely 0.73 on a small scale, and a medium criterion, namely 0.59 on a large scale. Based on the results of the response questionnaire distributed, a very positive response was obtained from teachers and students. From these results, it can be concluded that Android-based interactive media is effective for improving the learning outcomes of IPAS as well as feasible and practical to use in the learning of fifth-grade elementary school students.
The Effect of Process Oriented Guided Inquiry Learning (POGIL) Integrated Flipped Classroom on Problem Solving Ability and Self-Efficacy of High School Students on Thermochemistry Material
Authors: Kurnia Lani Dwi , Suyanta
Published: June 2024

This research aims to determine problem solving ability and self-efficacy simultaneously and respectively of students instructed using Process Oriented Guided Inquiry Learning (POGIL) integrated flipped classroom and the effective contribution. This research is a quasi-experiment with posttest only control group design. The population in this study includes all students of class XI MIPA in senior high school in Mandau Subdistrict. The research samples were taken using cluster random sampling. The research was carried out at SMAN 2 Mandau.  The research instruments are essay questions of problem-solving ability and self-efficacy questionnaires. The data analysis used the MANOVA test with Hotteling's Trace test. The result of the research showed that there are significant differences in problem solving ability and self-efficacy simultaneously and respectively of students instructed using Process Oriented Guided Inquiry Learning (POGIL) integrated flipped classroom with a scientific approach on thermochemistry material and the effective contribution toward problem solving ability and self-efficacy simultaneously on thermochemistry material is 11.50%, problem solving ability 11.30% and self-efficacy 4.80%.
Weed Biology and Ecology Studies: Diversity, Dominance, Population and Weed Growth and Land Use Efficiency in Intercropping Corn (Zea mays l.) with Leguminous Crops in Dryland
Authors: Ngawit I Ketut , Sudika I Wayan , Suana I Wayan
Published: June 2024

The aim of the research is to examine the effect of intercropping corn with leguminous crops on weeds and land use efficiency. The experimental research method was designed using a randomized complete block design (RCBD) with three blocks. The treatments tested were monocrop planting patterns and intercropping between corn and leguminous crops. The results of the research showed that 16 weed species were found with high species diversity, evenness, dominance, and abundance, so that there were six dominant species that existed during plant growth. Peanuts and cowpeas are suitable for intercropping with corn because they can suppress the population and growth of weeds. Soybeans, green beans, and red beans are not suitable because they are not effective in suppressing the population and growth of weeds and compete with corn, so that corn yield losses due to competition are 38.20%–40.96% and due to weed competition, they reach 62.37%–63.77%.  The best ecological and agronomic land use efficiency was obtained by intercropping corn with peanuts and cowpeas, with NKL values based on dry biomass weights of 1.90 and 1.89 (NKL > 1) and dry seed weights of 1.79 and 1.78 (NKL > 1).
Smart Box Learning Media Based on Problem Based Learning to Improve Science Environmental Learning Outcomes
Authors: Maryana  , Wulandari Desi
Published: June 2024

The problems in this research are teachers' obstacles in creating concrete learning media, the problem-based learning model is less effective, and student learning outcomes are low in Environmental Science subjects. This research aims to: develop a design; test validity; and test the effectiveness of smart box learning media based on Problem Based Learning. The research method is a research and development method with a model developed by Sugiyono. The subjects in the research were media and material expert validators, students, and class V teachers at SD Negeri Wonosari 01. Data collection techniques were observation activities, interviews, document data analysis, questionnaires, validation sheets, and tests. The research results showed that the design of smart box learning media based on Problem Based Learning pays attention to the needs of teachers and students in learning activities; product validity obtained a percentage of 87.5% from media expert validators with very valid criteria and 88.75% from expert validators material with very valid criteria; and product effectiveness using the paired sample t-test, namely the calculated t result is 10.69 and the significance value is 0.00 so that there is a difference in the average pretest and posttest scores. The N-Gain test result was 0.54 with moderate criteria so that there was an increase in the average pretest and posttest scores.