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REKONSTRUKSI VARIASI BULANAN SALINITAS DI JALUR ARUS LINTAS INDONESIA SELAMA ~ 200 TAHUN: REKAMAN SALINITAS DARI δ18О KARANG BUNAKEN DAN BALI Hernawan, Indra; Cahyarini, Sri Yudawati; Putri, Mutiara
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 3 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Salinity is one of important parameter in oceanographic studies. The long timeseries oceanographic data is required to more understand the variability of oceanographic condition. Coral geochemical proxies overcome the shortcoming of instrumental data availibility. δ18О contents in coral skeleton is influenced by sea surface temperature and δ18О seawater. δ18О seawater is influenced by salinity. In this study salinity is reconstructed using coral δ18О and SST from the data model. δ18О from Bunaken and Padang Bai (Bali) corals are used in this study. SST data from the ERSST, SODA and HAMSON are used to reconstruct salinity. This study result in that the Bunaken coral records the local salinity variation in monthly and annual mean resolution. Padang Bai coral records better salinity in annual mean variation than in monthly variation. In both region, salinity variation in decadal resolution does not show significantly different.Keywords: Salinity, Sea surface temperature, δ18О, coral, Bunaken and Bali.
Efek Media Pembelajaran Berbasis Teknologi (Wordwall) Terhadap Hasil Belajar Siswa pada Pelajaran IPA Rahmi, Syifa Ur; Ilmi, Aziz Rizki Miftahul; Hernawan, Indra
Tut Wuri Handayani : Jurnal Keguruan dan Ilmu Pendidikan Vol. 4 No. 4 (2025): Desember 2025
Publisher : Lembaga Riset Ilmiah

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Abstract

Pada pembelajaran Ilmu Pengetahuan Alam (IPA) di jenjang Sekolah Menengah Pertama (SMP), media pembelajaran yang tepat sangat dibutuhkan karena karakteristik materi IPA bersifat konseptual dan abstrak. Namun, berdasarkan observasi awal yang dilakukan di SMP N 1 Cikedung Kabupaten Indramayu, diketahui bahwa proses pembelajaran IPA masih didominasi oleh metode ceramah dengan menggunakan buku teks dan penjelasan langsung dari guru. Hal ini menyebabkan siswa kurang aktif dan cepat merasa bosan selama pembelajaran berlangsung. Dampaknya terlihat pada hasil belajar siswa yang masih berada di bawah standar ketuntasan minimal (KKM) yang ditetapkan sekolah. Penggunaan teknologi media ajar wordwal memberikan motivasi pada siswa sehingga meningkatkan hasil belajar siswa. Hal ini ditunjukkan melalui uji-t yang menghasilkan thitung> ttabel dimana thitung variabel hasil belajar adalah sebesar 20,970 sedangkan ttabel adalah sebesar 1,960 maka 20,970>1,960 sehingga dapat menyimpulkan bahwa terdapat pengaruh signifikan penggunaan wordwall terhadap hasil belajar. Hal ini diperkuat juga dengan data hasil observasi dan wawancara yang memperlihatkan motivasi siswa dalam mengikuti pembelajaran meningkat dari sebelumnya.   In the teaching of Natural Sciences (IPA) at the junior high school level, appropriate instructional media are essential because the subject matter is conceptual and abstract. However, initial observations conducted at SMPN 1 Cikedung, Indramayu Regency, revealed that the science teaching process was still dominated by lecture methods, relying primarily on textbooks and direct explanations from the teacher. This approach resulted in low student activity and rapid onset of boredom during lessons. The impact was reflected in student learning outcomes that remained below the school’s minimum completeness criterion (KKM). The use of Wordwall as an instructional technology motivated students and consequently improved their learning outcomes. This effect is demonstrated by a t-test in which t_calculated > t_table: the t_calculated for the learning outcome variable was 20.970, while the t_table (critical value) was 1.960 (20.970> 1.960), allowing us to conclude that the use of Wordwall had a significant effect on learning outcomes. This conclusion is further corroborated by observation and interview data showing an increase in student motivation to participate in lessons compared with prior practice.