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The Correlation of The Mixed Layer Depth with La Nina and El Nino Index In The Natuna Basin Aji, Tri; Pranowo, Widodo Setiyo; Asmoro, Nuki Widi; Agustinus, Agustinus; Kurniawan, Muhammad Azis; Rahmatullah, Amri
Journal Omni-Akuatika Vol 19, No 2 (2023): Omni-Akuatika November
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2023.19.2.1089

The Natuna Sea is one of the seas located in the northern part of Indonesia, which is influenced by several oceanographic climate phenomena, including the El Nino-Southern Oscillation (ENSO) system, such as La Nina and El Nino, which cause vertical temperature dynamics. This study aimed to examine the relationship between La Nina, El Nino, and normal years on the variability of the mixed layer depth in the Natuna Sea. The study utilized temperature data from the World Ocean Database (WOD) and Marine Copernicus for a period of 3 years, including years with La Nina, El Nino, and normal conditions, as well as mixed layer depth (defined by sigma theta) data from Marine Copernicus. the occurrence of La Nina, El Nino and normal years obtained from the Southern Oscillation Index (SOI). The results showed that the correlation of SOI values with the depth of Maximum Mix Layer Depth (MLD) during El Nino and La Nina was weak and very weak during the Normal year. During the La Nina, normal, and El Nino periods, the deepest MLD occurred during the west monsoon season at depths ranging from 7 to 60 meters. The shallowest MLD occurred during the first transition season at depths ranging from 7 to 25 meters. The MLD values during the east monsoon season depths ranging from 7 to 43 meters, and during the second transition season, the MLD ranges from 7 to 44 meters.

Relationship between water mass characters to Sound velocity profiler (SVP) in the Sulawesi Sea Agustinus, Agustinus; Pranowo, Widodo Setiyo; Manik, Henry Munandar; Rahmatullah, Amri; Aji, Tri
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 12, No 3 (2023): DECEMBER 2023
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.12.3.32296

The Sulawesi Sea is the western entry point of the Indonesian throughflow, which brings water masses from the Pacific Ocean. This study aims to describe the relationship between water mass characteristics and Sound Velocity Profiler (SVP) in the Sulawesi Sea based on Marine Copernicus data from 2022 with a depth of up to 500 meters. Temperature and Salinity data were used to obtain water mass types from the Tpot-S diagram based on Emmery's classification and Sound Velocity Profiler (SVP) based on the Medwin empirical equation. The temperature, salinity, and SVP data were visualized using ODV 5.6.2 software. The data processing results have identified several water mass characteristics that are believed to be influenced by the Eastern North Pacific Central Water (ENPCW) water mass type found at depths ranging from 130 to 318 meters, Western North Pacific Central Water (WNPCW) water mass found at depths ranging from 130 to 500 meters, Eastern South Pacific Central Water (ESPCW) water mass found at depths ranging from 92 to 453 meters, and Western South Pacific Central Water (WSPCW) water mass found at depths ranging from 130 to 500 meters. The ENPCW water mass type on average has a smaller difference in SVP values compared to the WNPCW water mass type. Meanwhile, the ESPCW water mass type on average has a greater difference in SVP values compared to the WSPCW water mass type. The results indicate a positive relationship between temperature and SVP, meaning that the higher the temperature, the higher the SVP. However, there is a negative relationship between salinity and SVP, meaning that the higher the salinity, the lower the SVP.Keywords:Water MassTemperatureSalinitySound VelocitySulawesi Sea

Relationship between water mass characters to Sound velocity profiler (SVP) in the Sulawesi Sea Agustinus, Agustinus; Pranowo, Widodo Setiyo; Manik, Henry Munandar; Rahmatullah, Amri; Aji, Tri
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 12, No 3 (2023): DECEMBER 2023
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.12.3.32296

The Sulawesi Sea is the western entry point of the Indonesian throughflow, which brings water masses from the Pacific Ocean. This study aims to describe the relationship between water mass characteristics and Sound Velocity Profiler (SVP) in the Sulawesi Sea based on Marine Copernicus data from 2022 with a depth of up to 500 meters. Temperature and Salinity data were used to obtain water mass types from the Tpot-S diagram based on Emmery's classification and Sound Velocity Profiler (SVP) based on the Medwin empirical equation. The temperature, salinity, and SVP data were visualized using ODV 5.6.2 software. The data processing results have identified several water mass characteristics that are believed to be influenced by the Eastern North Pacific Central Water (ENPCW) water mass type found at depths ranging from 130 to 318 meters, Western North Pacific Central Water (WNPCW) water mass found at depths ranging from 130 to 500 meters, Eastern South Pacific Central Water (ESPCW) water mass found at depths ranging from 92 to 453 meters, and Western South Pacific Central Water (WSPCW) water mass found at depths ranging from 130 to 500 meters. The ENPCW water mass type on average has a smaller difference in SVP values compared to the WNPCW water mass type. Meanwhile, the ESPCW water mass type on average has a greater difference in SVP values compared to the WSPCW water mass type. The results indicate a positive relationship between temperature and SVP, meaning that the higher the temperature, the higher the SVP. However, there is a negative relationship between salinity and SVP, meaning that the higher the salinity, the lower the SVP.Keywords:Water MassTemperatureSalinitySound VelocitySulawesi Sea

Pengaruh Latihan Squat Jump dan Bodyweight Squat Terhadap Kekuatan Otot Tungkai Pada Atlet Wushu Taolu di Kabupaten Kudus Ihsani, Ilham; Aji, Tri
Kinestetik : Jurnal Ilmiah Pendidikan Jasmani Vol 9 No 3 (2025): September
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jk.v9i3.43672

This study aims to determine the effect of squat jump and bodyweight squat training on leg muscle strength of Kudus Regency Wushu athletes. Quantitative data from a quasi-experimental design are used in this study. The sample for this study included 16 individuals between the ages of 15 and 20 who were male and female Wushu Taolu practitioners in the Kudus Regency. The research instrument used pretest-posttest data collection with the vertical jump test. Normality tests, homogeneity tests, and t-test hypothesis tests are all included in data analysis procedures. The comes about appeared that there was a noteworthy impact of squat hop and bodyweight squat preparing on leg muscle quality of Kudus Regency Wushu Taolu athletes. The percentage increase in squat jump training is 15.31%, while bodyweight squat training has a percentage increase of 14.69%. This shows that squat jump training and bodyweight training both have a significant effect on increasing leg muscle strength.

Availability of Sports Open Spaces in Tawangharjo District, Grobogan Regency: A Sport Development Index Perspective Pratama, Rivan Saghita; Seftiana, Seftiana; Wahadi, Wahadi; Aji, Tri; Nadzalan, Ali MD; Imron, Fatkhul; Santosa, Teguh; Kusumawardhana, Buyung; Setia Lengkana, Anggi
Journal of Sport Science and Education Vol 9 No 1 (2024)
Publisher : Faculty of Sport and Health Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jossae.v9n1.p63-71

The number of open spaces and the population aged seven years and above are known to determine the ratio of open spaces to the Sports Development Index. This study used a survey method with a quantitative descriptive approach, using sports open spaces as research variables. The sampling technique was based on the Sports Development Index (SDI), namely the Multistage Random Sampling. The population of this study was residents of Tawangharjo Village, Tarub Village, and Godan Village. The availability of open sports spaces in the Tawangharjo sub-district, represented by 3 villages, namely Tawangharjo, Tarub, and Godan, is in a low category. The solution is to improve sports development in the open space aspect, namely by involving the government to improve the welfare of the people, such as by providing the most superior sports facilities in the region, including football, volleyball, martial arts, and jogging tracks. The role of the community can help develop sports development, such as cooperation in cleaning abandoned sports open spaces.

Core Training Model Using Swiss Ball Based on Interactive Multimedia for Pencak Silat Athletes Aged 15-17 Years Students dani, Ramdani Amrullah; Asmutiar; Aji, Tri
Journal of Physical Education and Sports Vol. 13 No. 1 (2024): MARCH 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Core muscles are very important for stabilization and building strength in all sports activities. This study aims to develop an interactive media design model as a source of exercise and to determine the effectiveness of the core exercise model based on interactive media using a Swiss ball on student athletes. Method: This study uses research and development, validity test of questionnaire conducted by experts in their field. Testing the ability of the product produced, using the design of experimental quesi done with the model Pretest-Posttest Control Group Design. The number of samples used as many as 60 athletes aged 15-17 years, divided into 30 experimental classes and 30 controls. Data analysis test the effectiveness of media training intractive developed using t test Increase the exercise results of athletes using Gain Score. Analysis: the average N-gain score for the experimental group obtained a value of 58 included in the category of quite effective, with a minimum N-gain score value of 19.53 with a maximum value of 200 while the N-gain score for the control class (conventional exercise model) is 25.4 included in the category of “less effective”, with a minimum N-gain score value of 0.89 and a maximum N-gain value of 89.58. So it can be concluded that the core exercises using swiss ball are quite meaningful from the conventional exercise model. Conclusion: Based on the pretest and posttest evidence, core exercises using Swiss ball based on interactive media effectively increase core muscle strength. The effectiveness of core exercises based on Swiss ball must be accompanied by a training pattern that suits the muscle group and anatomical adaptation of the exercise according to the athlete’s ability.

Peramalan Kerapatan Air Laut (Densitas) Selama Dua Belas Hari Menggunakan Model Regresi: Studi Kasus Laut Timor. Asmoro, Nuki Widi; Pranowo, Widodo Setiyo; Aji, Tri; Rahmatullah, Amri
Jurnal Kelautan Nasional Vol 19, No 1 (2024): APRIL
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jkn.v19i1.12766

Laut Timor adalah salah satu perairan strategis yang penting untuk kegiatan pelayaran kapal selam. Informasi akurat tentang nilai densitas di perairan Laut Timor masih sangat terbatas dan sulit dilakukan secara tepat. Penelitian ini menggunakan 6 stasiun observasi yang dianggap mewakili daerah penelitian untuk melihat karakteristik sekitar daerah penelitian. Penelitian ini bertujuan untuk mengestimasi nilai densitas air laut di Laut Timor dengan regresi linear menggunakan data model Copernicus Marine Environment Monitoring Service (CMEMS) sebagai variable independent dan data in situ World Ocean Database (WOD) sebagai variable dependent di lapisan permukaan, lapisan thermocline dan lapisan dalam. Komputasi yang digunakan untuk menentukan nilai densitas menggunakan persamaan TEOS-10 UNESCO yang telah diinstall di Ocean Data View (ODV) dan hasilnya digunakan untuk pembangunan persamaan regresi menggunakan modul Analysis Toolpak yang telah diinstall di Microsoft excel. Data yang digunakan meliputi posisi, kedalaman, salinitas, suhu pada kedalaman tertentu, kemudian dilakukan forecasting model secara statistika untuk memprediksi densitas air laut di Laut Timor selama 12 hari di lapisan permukaan, lapisan Termoklin dan lapisan dalam. Penelitian ini penting karena nilai densitas laut yang akurat sangat diperlukan dalam mendukung pelayaran kapal selam, terutama dalam hal navigasi dan keseimbangan hidrostatik. Hasil penelitian ini berupa nilai forecasting estimasi nilai densitas pada 3 lapisan kedalaman pada lapisan permukaan nilai tertinggi 1.021,8 kg/m³ dengan nilai rata-rata MAPE 0,25% dan lapisan Termoklin densitas tertinggi 1.024,79 kg/m³ dengan nilai rata-rata MAPE 1,65% dan laut dalam densitas tertinggi 1.032,30 kg/m³ dengan nilai rata-rata MAPE 0,021%. Diharapkan bahwa penelitian ini dapat memberikan kontribusi positif dalam pengembangan ilmu pengetahuan -oseanografi di Laut Timor.

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