The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Ultra-wideband (UWB) communication techniques are highly interesting because they seek to rearrange the huge spectrum of UWB for diverse applications. Therefore, UWB is the main technique employed in communication systems for 4G wireless networks. However, several issues in UWB technology, such as interference with various existing civil and military communication systems, require resolution. In this...
This paper is a general review of the ionospheric studies in Malaysia using Global Positioning System (GPS) technique. Inhomogeneous ionosphere can affect satellite signals that are travelling through the layer which exists at 50 to 2000 km above the Earth's surface. The equatorial ionosphere is unique where many ionospheric irregularities occur such as plasma bubble, equatorial anomaly, equatorial...
Space science is a field that is gaining much attention of students and society in Malaysia after the success of sending an astronaut to the International Space Station (ISS). This pilot study aims to investigate secondary school students' perception and attitude towards space science in Malaysia. The study was conducted by using a questionnaire containing 10 items measuring students' perception and...
The Relative Sunspot Number (RSN) has been determined for centuries manually (visually) and internationally recorded by Solar Influence Data Center (SIDC). This has been the case even today due to strong goal of keeping the sunspot counting data consistent, dating back to the early 1600s. The RSN indicates the Sun's magnetic activities and therefore accurate detection and classification are fundamental...
Over the Southeast Asian region, strong surges of cold northeasterly winds are common during winter of the southern hemisphere. For these cold surges, the occurrence frequency is known to vary in conjunction with the El Niño-Southern Oscillation (ENSO) phenomenon. This preliminary study looks at the correlation between cold surge frequency (CSF) and two indicators of ENSO-induced anomalies — the Southern...
This study is aimed to clarify the ability of precipitable water vapor (PWV) index variability in detecting the air pollutants concentration in Banting, Selangor. For that purpose, we have developed the PWV index using the fuzzy clustering (Fuzzy C-Means (FCM)). There are five categories of PWV index, namely “Very Low”, “Low”,” Moderate”, “High” and “Very High”. Correlation analysis was performed...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.