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EINSTEIN (E-JOURNAL)
Published by Universitas Negeri Medan
ISSN : 23381981     EISSN : 2407747X     DOI : https://doi.org/10.24114/einstein%20e-journ.v11i1
Core Subject : Science, Engineering,
Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Materials Science & Nanotechnology Mechanical Engineering Physics
EINSTEIN (e-Journal) is a journal managed by the Department of Physics, Faculty of Mathematics and Natural Sciences, State University of Medan. This journal is published three times a year (February, June, and October). EINSTEIN (e-Journal) is a scientific journal that publishes articles from the fields of physics. Various topics of physics articles that can be accepted in this journal are: Theoretical Physics Earth Physics Material Physics Instrumentation Physics Computational Physics Applied Physics
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 294 Documents
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The IDENTIFIKASI BATUAN BAWAH PERMUKAAN DAERAH PANAS BUMI TAPANULI UTARA MENGGUNAKAN METODE HORIZONTAL TO VERTICAL SPECTRAL RATIO Iswari, Wita; Juliani, Rita
EINSTEIN (e-Journal) Vol. 14 No. 1 (2026): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/b1bd4b60

Abstract

The research aims to identify subsurface rocks in the geothermal area of North Tapanuli using the Horizontal to Vertical Spectral Ratio (HVSR) method. The HVSR method analyzes the spectral response of microtremor waves to obtain dominant frequency parameters (f₀) and amplification factors (A₀) that can describe the depth and type of subsurface layers. Data were collected in four locations, namely Partali Toruan village, Parbubu village, Situmeang Hasundutan village, and Simasom Toruan village. The analysis results show that the f₀ values in Partali Toruan Village, Situmeang Hasundutan Village, and Simasom Toruan Village indicate the presence of breccia, andesite, and basalt bedrock in the subsurface and function as cover rock in the geothermal system. Parbubu Village produces f₀ values that indicate an alluvium sedimentary layer. The shear wave velocity (Vs) profiles obtained show a stratigraphic structure typical of volcanic areas, with a significant increase in Vs with depth indicating a transition from medium soil to hard rock.
BIOSENSOR ELEKTROKIMIA BERBASIS POLIMER CETAK MOLEKULER (MIP) DAN CETAK PERMUKAAN UNTUK DETEKSI PENYAKIT INFEKSIUS: Tinjauan Kemajuan Terkini dan Tantangan dalam Pengembangan Biosensor Elektrokimia Berbasis MIP untuk Deteksi Patogen Hudaiby, Nazwa; Ritonga, Winsyahputra
EINSTEIN (e-Journal) Vol. 14 No. 1 (2026): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jqca2t05

Abstract

Electrochemical biosensors have emerged as promising tools for the diagnosis of infectious diseases due to their high sensitivity, rapid response, and low cost. The use of molecularly imprinted polymers (MIPs) and surface imprinted polymers (SIPs) as robust and selective artificial receptors has gained significant attention. This review summarizes the recognition mechanisms between MIPs/SIPs and various infectious disease biomarkers, including small molecules, microbial toxins, viruses, and bacterial or fungal cells. Different MIP/SIP fabrication techniques such as electropolymerization, coating, and micro-contact imprinting are discussed. The review also highlights clinical applications of MIP/SIP-based biosensors for detecting specific pathogens, such as HPV, HIV, E. coli, and Zika virus. Key challenges such as enhancing sensitivity and selectivity, as well as the future potential of integrating artificial intelligence in biosensor design, are also addressed
The Effect of Grammage on Bulk in A-Grade Printing Paper Based on Taro Skin and Oil Palm Fronds Putri Nadila; Ety Jumiati; Miftahul Husnah
EINSTEIN (e-Journal) Vol. 14 No. 1 (2026): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/hgh4na76

Abstract

The use of wood as the main raw material for paper production causes environmental problems such as deforestation. This study aims to analyze the physical characteristics of paper made from taro skin and oil palm fronds through the parameters of grammage and bulk. Grammage and bulk are important parameters in determining the quality of printing paper A according to SNI 7274:2008. The composition variations used were samples A (60%:40%), B (40%:60%), and C (20%:80%). The results show that the lowest grammage value is 79 g/m2 in the 20%:80% variation and the highest grammage value is 90 g/m2 in the 60%:40% variation. For bulk testing, the lowest value was 1.11 cm3/g in the 20%:80% variation and the highest bulk value was 1.46 cm3/g in the 60%:40% variation. All samples met the SNI 7274:2008 standard for A-grade printing paper, with a grammage limit of 50-100 g/m2 and a maximum bulk of 1.5 cm3/g. Increasing the proportion of oil palm fronds reduced the grammage but increased the bulk. This study proves the potential of taro skin and oil palm fronds as raw materials for environmentally friendly paper.
ANALYSIS OF CREPER MACHINE UTILIZATION IN CRUMB RUBBER PRODUCTION BASED ON BLANKET THICKNESS DISTRIBUTION AT PT. PANTJA SURYA Purba, Reza Hazly Al’Udlu; Siregar, Rohimah Nurul Huda; Alysha Tasya Aulia; Situmorang, Tiur Nauli; Siregar, Nisa Zahra Gustiani; Nasution, Budiman; Situmorang, Howard; Nasution, Habibi Azka
EINSTEIN (e-Journal) Vol. 14 No. 1 (2026): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/301n3m09

Abstract

Creper machines are vital in crumb rubber processing for reducing material thickness and ensuring blanket quality. This study provides a quantitative physical analysis of five creper machines at PT. Pantja Surya, focusing on how pressure force and maintenance schedules correlate with blanket thickness distribution. Primary data were collected through field observations and technical equipment specifications, which were subsequently analyzed using the Python programming language to calculate mechanical parameters, including the reduction ratio, roll-material contact length (Lp), and estimated compressive force (F). The results indicated that the maximum mechanical load was concentrated on Creper 1, with an estimated compressive force of 867.85 kN, correlating with the maximum contact length of 0.177 m. An anomaly was observed in Creper 3, which functions as a transition stage without thickness reduction to stabilize the material's viscoelasticity. The distribution of compressive force gradually decreases in Crepers 4 and 5 (382.57 kN and 352.28 kN, respectively), consistent with a more controlled reduction process. This analysis demonstrates that units subjected to higher compressive forces require shorter maintenance intervals (120 hours) compared to units with lower loads (160 hours). Consequently, these findings establish a framework for implementing load-based predictive maintenance to enhance operational efficiency in the industry.

Page 30 of 30 | Total Record : 294

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