Explanipedia

The Limitation of Optical Equipment in New Crescent Moon Visibility: Insight from 27 Years of Observation Data in Sarawak, Malaysia Open

Ahmad Hariz Bely, Roslan Umar, Nor Hazmin Sabri, Arshan Nasir, Razalie Hussaini , et al. · 2025

New Crescent Moon visibility has been extensively studied throughout history due to its undeniable importance in determining the Islamic calendar. Previous visibility models have relied on linear statistical theory, which does not fully ac…

Recurrent Jetlets Associated with the Disappearance of a Satellite Spot Open

Liheng Yang, Xiaoli Yan, Jun Zhang, Zhike Xue, Zhe Xu , et al. · 2025

Recurrent small-scale eruptions are fascinating phenomena in the solar atmosphere, characterized by repeated energy buildup and release over short time intervals. However, their underlying physical mechanisms remain unclear. On 2021 May 23…

Recurrent Jetlets Associated with the Disappearance of a Satellite Spot Open

Xiaoli Yan, Jun Zhang, Zhike Xue, Zhe Xu, Jincheng Wang , et al. · 2025

Recurrent small-scale eruptions are fascinating phenomena in the solar atmosphere. However, their underlying physical mechanisms remain unclear. On 2021 May 23, five recurrent jetlets (J1-J5) were observed continuously ejecting from a sate…

Inertial sensor-based heel strike and energy expenditure prediction using a hybrid machine learning approach Open

Kethohalli R Vidyarani, Viswanath Talasila, Roslan Umar, V. Prem, Ravi Prasad K. Jagannath , et al. · 2025

Objective Gait analysis plays a critical role in healthcare, biomechanics, and sports science, particularly for estimating energy expenditure (EE). This study introduces a hybrid machine learning approach integrating convolutional neural n…

Comparative Analysis of Image Processing Technique in Determining the New Crescent Moon Visibility Open

Ahmad Lutfi Afifi Mohd Nasir, Roslan Umar, Wan Nural Jawahir Wan Yussof, Nazhatulshima Ahmad, Nor Hazmin Sabri , et al. · 2024

This research presents a comparative analysis of advanced image processing techniques to enhance the visibility of the new crescent moon, a crucial element in astronomy and the lunar calendar. The primary objective is to assess the effecti…

Analyzing Electron Beam-Induced Coronal Extreme Ultraviolet Emissions and Solar Radio Bursts Type III During M-Class Flares: A Preliminary Study Open

WZA Wan Mokhtar, A. K. Ariffin, Anis Nazihah Mat Daud, M. Z. Umar, Roslan Umar · 2024

Solar flare events are triggered by the process of magnetic reconnection, which leads to a sudden release of stored magnetic energy and intensifies the electromagnetic emissions across the entire spectrum. In this preliminary study, we inv…

Exploring solar flares and solar radio bursts associated with β-γ-δ active regions during the ascending phase of the solar cycle 25 Open

Nur Zulaikha Mohd Afandi, Roslan Umar, Sharifah Nurul Aisyah Syed Zafar, Nor Hazmin Sabri, C. Monstein · 2024

This paper presents an exploration of solar flares and solar radio bursts(SRBs) associated with β-γ-δ class active regions (ARs) during the ascending phase of solar cycle 25 th , spanning from January 2022 to May 2024. The β-γ-δ ARs have c…

Light Pollution Monitoring Through Zenithal Sky Brightness at Selected Malaysian Observatories Open

Ahmad Hariz Bely, Roslan Umar, Nor Hazmin Sabri, Zainal Abidin, Anam Nasir , et al. · 2024

Sky brightness magnitude is crucial for optical astronomical observations that require the dark skies area. This study focuses on the effect of artificial light pollution on astronomical observations by measuring the zenithal brightness at…

L<sub>CO(1-0)</sub> – L<sub>FIR</sub> Correlation at Sub-Kiloparsec Scale in Nearby Spiral Galaxy NGC 1068 Open

Jazeel H. Azeez, Roslan Umar · 2024

The impetus for researching the L CO(1-0) -L FIR connection at sub-kpc levels comes from the opportunity to improve our knowledge of the intricate processes regulating star formation, molecular gas dispersion, and galaxies’ overall evoluti…

Empowering Astronomical Exploration: Advancement of New Moon Observation Devices in Sarawak, Malaysia Open

Ahmad Hariz Bely, Arshan Nasir, Roslan Umar, Wan Mohd Yusof Wan Chik, Razalie Husaini , et al. · 2024

Understanding the motion of celestial objects is essential for space exploration. Observing the new crescent Moon requires advanced technological devices due to the moon’s position in the atmosphere and the refraction of sunlight on the ho…

The Intense Geomagnetic Storm on March 24, 2023, Associated with Halo CMEs and Solar Flares Open

Sharifah Nurul Aisyah Syed Zafar, Roslan Umar, Nor Hazmin Sabri, Mohamad Huzaimy Jusoh, Akimasa Yoshikawa , et al. · 2024

Interplanetary coronal mass ejections (ICMEs) that accompany solar flares are associated with the occurrence of severe geomagnetic storms. The goal of this research is to examine an intense geomagnetic storm on March 24^, 2023 with a symme…

The Implementation of Hybrid Observation Technique of Hilal (HOTOH) Open

Anam Nasir, Roslan Umar, Wan Nural Jawahir Wan Yussof, Naẕīr Aḥmad, Ahmad Najmuddin Zulkeflee , et al. · 2024

In 2022, Malaysians were unexpectedly informed that Eid al-Fitr would be celebrated on 2nd May, disrupting plans based on the anticipated 3rd May date. This highlighted the need for better crescent moon sighting methods. This study aims to…

Automated Monitoring System for Detection of Solar Radio Bursts for CALLISTO Spectrums Open

Nor Hazmin Sabri, Nur Zulaikha Mohd Afandi, Roslan Umar, Suhailan Safei, Christian Monstein · 2024

Continuous monitoring of solar radio bursts using ground spectrometers is now essential for solar researchers, particularly in predicting space weather. Type II, Type III, and Type IV solar bursts are linked to significant solar flares and…

Influence of Wind Speed and Direction on the Performance of Low-Cost Particulate Matter Sensors Open

Agus Purnomo, Asep Andang, Siti Badriah, Ervan Paryono, Aceng Sambas , et al. · 2024

A review on features and methods of potential fishing zone Open

Norsuzila Ya’acob, Nik Nur Shaadah Nik Dzulkefli, Mohd Azri Abdul Aziz, Azita Laily Yusof, Roslan Umar · 2024

This review focuses on the importance of identifying potential fishing zones in seawater for sustainable fishing practices. It explores features like sea surface temperature (SST) and sea surface height (SSH), along with classification met…

New Crescent Moon Detection Using Circular Hough Transform (Cht) Open

Ahmad Lutfi Afifi Mohd Nasir, Roslan Umar, Wan Nural Jawahir Wan Yussof, Nazhatulshima Ahmad, Ahmad Najmuddin Zulkeflee , et al. · 2024

Integrasi Karakter Moral dan Karakter Kinerja dalam Pembelajaran di Madrasah Aliyah Negeri Gorontalo Open

Cut N. Ummu Athiyah, Roslan Umar · 2023

This research aims to identify and examine the integration of moral and performance characters within the MAN Insan Cendikia Gorontalo (ICG) learning process. It focuses on intracurricular, co-curricular, extracurricular, and hidden curric…

PRELIMINARY STUDY OF AMBIENT ELECTROMAGNETIC RADIATION AT BASE TOWER STATIONS IN RESIDENTIAL AREAS IN KUALA NERUS Open

Nur Masuriawati Senafi, Nazifah Abdullah, Roslan Umar, Nurul Syazwina Mohamed, Roha Tukimin , et al. · 2023

Introduction: Mobile communications developed into an integral component of our daily life. The growing demand for mobile communication services in Kuala Nerus has seen an increase in the installation of base station towers (BST) in reside…

Model Spatial Magnitud Kecerahan Langit di Balai Cerap KUSZA, Universiti Sultan Zainal Abidin (UniSZA) Open

Roslan Umar, Muhammad Arif Imran Ahmad Azan, Nor Hazmin Sabri, Norhayati Ngah, Ahmad Najmuddin Zulkeflee , et al. · 2023

Magnitud kecerahan langit merupakan antara aspek penting dalam bidang astronomi, terutama bagi cerapan astronomi optik yang memerlukan keadaan langit yang sangat gelap. Di Malaysia, terdapat banyak balai cerap rasmi dan persendirian yang d…

Detection and Management of Freshwater Invasive Alien Species through Environmental DNA Analysis and Geographic Information Systems: A Review Open

Mohamad Zulkarnain Mohd Dali, Roslan Umar, Norshida Ismail, Hafizan Juahir, Muhammad Syafiq Aiman Mohd Nasir , et al. · 2023

Freshwater invasive alien species (IAS) are non-native organisms that were intentionally or unintentionally released into local water bodies and later harmed the invaded habitat by disrupting the ecological processes. Over the last few yea…

Elucidation on Performance and Structural Properties of Skinned Asymmetric Nanofiltration Membrane Based on Theoretical Models Open

Sabariah Rozali, Nurul Hannan Mohd Safari, Abdul Rahman Hassan, Roslan Umar · 2023

In this study, the performance and structural properties of enhanced skinned asymmetric nanofiltration (NF) membranes were experimentally and theoretically analyzed. Based on Donnan and steric-hindrance transport mechanism, the relationshi…

PUBLIC PARTICIPATION IN ENVIRONMENTAL IMPACT ASSESSMENT (EIA) LAW IN MALAYSIA: A CRITICAL ANALYSIS Open

Ing Hoe Loh, Mohd Khairul Amri Kamarudin, Ju Lian Chong, Roslan Umar, Chen Yii Ling · 2023

Public participation in environmental impact assessment has been recognized under Principle 10 of the Rio Declaration on Environment and Development. According to Principle 10, the public shall have right to access to information, particip…

Comparison of rainwater quality before and during the MCO using chemometric analyses Open

Nadiana Ariffin, Hafizan Juahir, Roslan Umar, Mokhairi Makhtar, Nur Hanis Mohamad Hanapi , et al. · 2023

A REVIEW INFLUENCE OF LIGHT ON INSECT ACTIVITY AND BEHAVIOUR: SUSTAINABLE LIGHTING AND LIGHT POLLUTION Open

Ahmad Solihin Sira Juddin, Norhayati Ngah, Roslan Umar, Kwasi Asante, Musa Garba Abdullahi · 2023

This paper reviews the influence of artificial light at night on insect activity and behaviour reported around the world with a focus on Malaysian insects. Insects, whether diurnal or nocturnal are the most diverse organisms on the planet …

Predicting Cherax quadricarinatus Habitat Distribution Patterns Through the Usage of GIS and eDNA Analysis in Terengganu, Malaysia Open

Mohamad Zulkarnain Mohd Dali, Muhammad Syafiq Aiman Mohd Nasir, Aliyu Garba Khaleel, Mun Chun Leong, Han Ming Gan , et al. · 2023

Cherax quadricarinatus (von Martens, 1868) is a highly invasive species that is resilient and highly adaptable to environmental conditions in new locations. Its presence brings along ecosystem imbalances and causes socioeconomic losses in …

Lake UniSZA Water Quality Monitoring: Pollution Effects to The Aquatic Environment Open

Nur Hanis Mohamad Hanapi, Roslan Umar, Azimah Ismail, Fathurrahman Lananan, Nik Ahmad Firdaus Nik Wan , et al. · 2023

Lake is one of the complete ecosystems and source of freshwater itself. Lake serves as a habitat for aquatic plants and animals, including the microorganisms. Lake can either be formed naturally or manmade. Most formed lakes are from volca…

Rising Water, Rising Voices: Empowering Communities Through The Flood Emergency Response Plan Open

Nor Aida Mahiddin, Roslan Umar, Navaneetharaj Rajan · 2023

This paper presents a comprehensive Flood Emergency Response Plan designed to enhance flood preparedness and response capabilities in a specific town while promoting sustainable practices and minimizing environmental impact. Through tailor…

Enhancing Moon Crescent Visibility Using Contrast-Limited Adaptive Histogram Equalization and Bilateral Filtering Techniques Open

Wan Nural Jawahir Hj Wan Yussof, Mustafa Man, Roslan Umar, Ahmad Najmuddin Zulkeflee, Ezmahamrul Afreen Awalludin , et al. · 2022

Image enhancement is becoming increasingly important with the advancement of space exploration techniques and the technological development of more durable and scientifically sound observatories equipped with more powerful telescopes. The …

ASSESSMENT OF LIGHT POLLUTION AND SUSTAINABILITY USING GEOSPATIAL APPROACHES: A CASE STUDY IN UITM SHAH ALAM SELANGOR Open

Mohd Sharul Aikal Baharim, ESSM SADEK, Roslan Umar · 2022

RAINWATER HARVESTING OPPORTUNITIES: WATER RESOURCE SUSTAINABILITY Open

FAZILLAH S.N.A, Azimah Ismail, Hafizan Juahir, R. BADLISHAH AHMAD, L. FATURRAHMAN , et al. · 2022

This study aims to identify the degree of which factors contribute to the rainwater quality and understanding anthropogenic contributions to the atmospheric environment.A total of 1830 rainwater data were collected from rain gauge stations…

Roslan Umar YOU? Author Swipe