EVOLUSI: JOURNAL OF MATHEMATICS AND SCIENCES

Model Graf Kompatibel di Persimpangan Islamic Center (IC) Mataram Lombok

Bulqis Nebulla Syechah — 2023-07-06

The purposes of this study were to determine the form of compatible graph from the flow of traffic model’s result at the junction, to calculate the optimal total waiting time at the intersection using compatible graph, and to determine the result calculation of the optimal total of waiting time based on the compatible graph on the settings that have been applied. The results of this study were obtained in the form of the compatible graph from the flow of traffics model’s result at Langko-Airlangga-Udayana-Pejanggik crooroad in Mataram, and the optimal total of waiting time at Langko-Airlangga-Udayana-Pejanggik four-junction which was obtained in the field was 291 seconds, while using compatible graph was 100 seconds. The result calculation of the optimal total of waiting time based on the compatible graph was more optimal (minimal) than based on the settings that have been applied.

Analisis Parameter Pencemaran Air dalam Penentuan Kualitas Sungai Brantas

Ferry Budi Prasetya — 2023-07-18

The Brantas River is still used for bathing, washing, and toilet purposes by the community around the river located on Agung Suprapto Dalam Street, Klojen District, Malang Regency. This needs attention because from the physical conditions observed, the Brantas River is suspected to have been polluted due to waste discharges from households and Syaiful Anwar Hospital. Therefore, it is necessary to analyze pollution parameters to determine the quality of the Brantas River. This research consists of two stages, namely field and laboratory activities. Field activities are the sampling stage and laboratory activities are the sample parameter analysis stage. The analysis results show that the pH of the water body is 7.3; temperature is 27 ^oC; alkalinity/acidity is 64.3 ppm; hardness is 11 ^oD; turbidity is 006 NTU; TSS is 40 ppm; TDS is 140 ppm; DO is 12.3 mg/L; BOD is 95%; COD is 88 mg/L; and dissolved CO₂ content is 74.8 mg/L. Based on these data, it can be concluded that the Brantas River is included in class 3 of water quality with a moderate pollution category according to Government Regulation Number 22 of 2021.

Uji Kadar Hambat Minimum Ekstrak Etanol Buah Asam Jawa (Tamarindus indica L.) Muda Pada Bakteri Staphylococcus aureus Penyebab Diare

Nurhikmah Nurhikmah — 2023-07-06

Tamarind (Tamarindus indica L.) can cure various diseases, one of which is diarrheal disease caused by Staphylococcus aureus bacteria. Tamarind fruit contains tannin compounds that have antibacterial abilities. This study aims to determine the inhibitory power of ethanol extract of young tamarind fruit against Staphylococcus aureus bacteria that cause diarrhea. The concentrations used in this study were 10%, 25%, 45%, 75% and 100%. The method used is the well diffusion method with 4 treatments and 4 repeats. The results showed that ethanol extracts of tamarind fruit young proved to be able to suppress the growth of Staphylococcus aureus bacteria with the highest inhibitory zone of 19.85 mm. This inhibitory power is a strong category in inhibiting bacterial growth.

Uji Virulensi Patogen Fusarium solani f.sp. cepae Pada Tanaman Bawang Merah (Allium ascalonicum L.)

Irna Il Sanuriza — 2023-07-10

Pathogens are one of the obstacles in shallot cultivation. One of them is Fusarium sp. which resulted in damage reaching more than 50-75%. The aim of this study was to determine the virulence level of the fungus Fusrium.solani.f.sp.cepae that causes fusrium wilt in shallot plants. The method used is an experimental method with a completely randomized design (CRD) with two treatments: method of application and time of observation/measurement. The average incubation period of fusarium wilt disease on shallots without F.solani.f.sp.cepae treatment had no symptoms of attack, while those that were treated showed symptoms in a short time. The results showed that the pathogen F.solani.f.sp.cepae was able to attack plants with an average attack intensity of 4.22, meaning high attack intensity. Macroscopically identification of fungi that had grown on potato dextrose agar (PDA) medium was observed, observations starting from the shape of the mushroom colonies and the color of the underside of the mushroom colonies, while microscopically found insulating hyphae, forming branching and found macroconidia and microconidia spores.

Studi Perilaku Harian Rusa Timor (Cervus timorensis) di Kawasan Savana Bekol Taman Nasional Baluran Situbondo

Bayuda Luqman Alfarisi — 2023-07-13

Baluran National Park is a conservation area with a climate and geography that supports the formation of dry savanna on the island of Java, so it is also known as "Little Africa in Java". The purpose of this study was to determine the daily behavior of the Timor deer (Cervus timorensis) in the Bekol Savana area, TN. Baluran, Situbondo Regency, East Java Province. The data collection technique was conducted through direct observation for one week in February 2023 using the time sampling method, accompanied by literature studies and interviews. Observations were made in three periods (morning-afternoon-evening) with an interval of 2 hours each period with an interval of 10 minutes. The results showed that the daily behavior of Timor deer was eating 19,84%, drinking 1,1%, standing 31.29%, walking 17.55%, running 2,92%, alert 12.59%, affiliative 2.31%, maternal 0,02%, playing 0.13%, and 0,13% vocalization. The most dominant daily behaviour of Timor deer is standing, with a frequency of 1.394 times (31,29%).

Keywords: baluran national park; daily behavior; timor deer.

Analisis Kandungan COD dan BOD di Tiga Titik Lokasi Sungai Patrean Manding Sumenep

Ulfatun Hasanah — 2023-07-14

The Patrean River is one of the rivers that flows in several locations in Sumenep District including Manding, Batuputih, Dasuk, Gapura and Kota sub-districts. This river is heavily flowed by domestic waste and industrial waste. The presence of such waste can cause a decrease in water quality characterized by an increase in Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD). The purpose of this study was to determine the BOD and COD content at three locations of the Patrean river, and to assess the pollution status using the pollution index method based on Government Regulation No. 82 of 2021. Sampling was carried out in three locations (upstream, middle, and downstream), this research method used survey and experimental methods. The results of the calculation of COD values in Patrean River waters at upstream, middle and downstream points are 12.75 mg/l, 19.12 mg/l, and 25.50 mg/l, respectively. BOD values at three points are 9.02 mg/l, 16.11 mg/l and 20.94 mg/l.

Sintesis Plastik Biodegradable dari Onggok Singkong dengan Plasticizer Gliserol

Ach. Kholish — 2023-07-14

Cassava pulp is solid waste from the tapioca flour industry which has not been utilized optimally. Cassava pulp has a high carbohydrate content, so its starch compounds can be extracted as biodegradable plastics. The polymerization process of cassava cassava starch as a biodegradable plastic can be assisted by the addition of acetic acid. The synthesis of biodegradable plastic from cassava cassava starch was carried out through four stages, starch extraction from cassava pulp, biodegradable plastic manufacture, mechanical tests in the form of elongation and tensile strength, and biodegradation tests with Aspergillus niger. The method used in this study was starch blending with the addition of 0.5 acetic acid; 1.0; and 1.5 mL using a glycerol plasticizer. The results showed that acetic acid was able to improve the mechanical properties without decreasing the plastic degradation time. The highest tensile strength value was produced by the 1.5 mL acetic acid formulation, which was 55.42 MPa, while the largest elongation was in the 1 mL acetic acid formulation, which was 105.0%.

Analisis Kebutuhan LKPD Berbasis Model Problem Based Learning Pada Pembelajaran Matematika SMP

Nilza Humaira Salsabila — 2023-07-18

The purpose of this research is to describe the results of the analysis of the needs of junior high school mathematics teachers towards the development of problem-based learning worksheet learning media to improve the numeracy skills. This research is part of development research which consists of 3 phases based on Plomp namely, Preliminary Research phase, Development phase, and Assessment phase. This research is in the Preliminary Research phase to analyze the needs of product or media development. The product developed in this study is a worksheet learning media based on the Problem Based Learning model. The subjects in this study were 18 junior high school math teachers, consisting of 10 males and 8 females. The data collection technique used in this study is a non-test technique using a research instrument in the form of a questionnaire. The questionnaire compiled is related to the needs of junior high school mathematics teachers for the development of problem-based learning worksheets. The results of the study show that the mathematics teacher agrees that Problem-Based Learning-based LKDP learning media needs to be developed to assist in improving students' numeracy skills.