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All Journal Jurnal Pemberdayaan Masyarakat Madani (JPMM) Jurnal Fisika dan Terapannya Optika : Jurnal Pendidikan Fisika Computational and Experimental Research in Materials and Renewable Energy (CERiMRE) Jurnal Ilmiah Wahana Pendidikan Journal of Science and Science Education (JoSSEd)
Latief, Muh. Fachrul
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Religion Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Neuroscience Physics Social Sciences Other

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Journal : Jurnal Ilmiah Wahana Pendidikan

 1 
Properti Cakrawala Peristiwa pada Lubang Hitam Schwarzschild dalam Latar Alam Semesta Tertutup yang Berekspansi Latief, Muh. Fachrul; Ramadani, Andi Indra Wulan Sari
Jurnal Ilmiah Wahana Pendidikan Vol 10 No 9 (2024): Jurnal Ilmiah Wahana Pendidikan
Publisher : Peneliti.net

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.13603701

Abstract

A closed universe model containing a constant and positive vacuum energy density (cosmological constant) has been studied. By analyzing the McVittie metric, it can be shown directly that for an expanding universe, the Hubble parameter at the event horizon for all static symmetric black holes is the same. As for the cosmological constant, black holes will not expand as the universe expands. In addition, the existence of the Hubble voltage is also explained which can affect the speed of the universe's expansion in certain areas.
Studi Sifat Fisik dan Kekuatan Tekan Material Komposit Serat Eceng Gondok dan Kulit Jagung Ramadani, Andi Indra Wulan Sari; Latief, Muh. Fachrul
Jurnal Ilmiah Wahana Pendidikan Vol 10 No 11 (2024): Jurnal Ilmiah Wahana Pendidikan 
Publisher : Peneliti.net

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.13605106

Abstract

The high demand for materials with unique properties such as composites, especially in increasingly massively produced structural applications, requires the industry to switch from synthetic fiber reinforced composites such as fiberglass to composites with natural fibers. The use of natural fibers as fillers not only considers their environmentally friendly properties but also the nature of natural fibers which tend to have low density so that they are expected to be able to provide unique physical and mechanical properties to engineered composite materials. This study examines how the physical properties and compressive strength of composites with epoxy matrices and two types of natural fiber fillers, namely water hyacinth and corn husks. The results of this study indicate that alkali treatment in the preparation of corn husk and water hyacinth fiber samples significantly affects the density, porosity and compressive strength of the resulting composites. In addition, the uniformity of fiber orientation and the number of fibers per unit area also contribute positively to the physical properties and compressive strength of natural fiber composite samples.
Co-Authors Abdi Gunawan Djafar Ahmadi, Haerul Andi Indra Wulan Sari Ramadani Asri Arbie Devita Irawati Putri Dewa Gede Eka Setiawan Jahja, Mohamad Kurniasari, Septiana Lapananda, Nuraliva F.P Meidji, Icha Untari Muhammad Yunus Muksin, Engelina Mursalin . Nonti, Efan Fajri Ramadhan Supu, Idawati