Equilibrium between Carbonates, CO2 and Brine

Imperial Users onl

Hubungan di antara pengetahuan dan sikap pensyarah terhadap penggunaan aplikasi pembelajaran atas talian

Pembelajaran atas talian merupakan satu kaedah pengajaran dan pembelajaran yang pada keseluruhannya disampaikan melalui internet dan berinteraksi dalam mod pembelajaran jarak jauh. Kepentingan pembelajaran atas talian terhadap kualiti pengajaran dan pembelajaran telah ditekankan dalam pelbagai kajian lepas. Walaubagaimanpun,tahap penerimaan dan pengaplikasian platform ini masih berada pada tahap yang membimbangkan, terutamanya di peringkat Institusi Pengajian Tinggi (IPT). Lantaran itu, tujuan utama kajian ini dijalankan adalah untuk mengkaji pengetahuan dan sikap pensyarah terhadap penggunaan aplikasi pembelajaran atas talian. Kajian tinjauan dengan pendekatan kuantitatif menggunakan soal selidik sebagai instrumen ini melibatkan seramai 234 orang pensyarah yang terdapat di enam buah fakulti di UTHM. Kaedah statistik yang digunakan dalam kajian ini adalah statistik deskriptif iaitu min dan statistik inferensi melalui kolerasi Pearson untuk mengkaji hubungan antara pengetahuan dan sikap pensyarah terhadap penggunaan aplikasi pembelajaran atas talian. Dapatan kajian menunjukkan tahap pengetahuan dan sikap pensyarah terhadap penggunaan aplikasi pembelajaran atas talian adalah tinggi. Hasil analisis menunjukkan terdapat hubungan signifikan positif yang kuat antara pengetahuan dan sikap pensyarah terhadap penggunaan aplikasi pembelajaran atas talian (r=.739, p 0.00,p>0.05). Kesimpulannya, kajian ini berpotensi menjadi rujukan untuk penambahbaikan perlaksanaan pembelajaran atas talian bagi merealisasikan hasrat KPM untuk meningkatkan kualiti penyampaian atas talian yang bertaraf global

On Modulo AG-groupoids

A groupoid G is called an AG-groupoid if it satisfies the left invertive law: (ab)c = (cb)a. An AG-group G, is an AG-groupoid with left identity e \in G (that is, ea = a for all a \in G) and for all a \in G there exists a' \in G such that a.a' = a'.a = e. In this article we introduce the concept of AG-groupoids (mod n) and AG-group (mod n) using Vasantha's constructions [1]. This enables us to prove that AG-groupoids (mod n) and AG-groups (mod n) exist for every integer n \geq 3. We also give some nice characterizations of some classes of AG-groupoids in terms of AG-groupoids (mod n).Comment: 10 page

Time-frequency represetation of radar signals using Doppler-Lag block searching Wigner-Ville distribution

Radar signals are time-varying signals where the signal parameters change over time. For these signals, Quadratic Time-Frequency Distribution (QTFD) offers advantages over classical spectrum estimation in terms of frequency and time resolution but it suffers heavily from cross-terms. In generating accurate Time-Frequency Representation (TFR), a kernel function must be able to suppress cross-terms while maintaining auto-terms energy especially in a non-cooperative environment where the parameters of the actual signal are unknown. Thus, a new signal-dependent QTFD is proposed that adaptively estimates the kernel parameters for a wide class of radar signals. The adaptive procedure, Doppler-Lag Block Searching (DLBS) kernel estimation was developed to serve this purpose. Accurate TFRs produced for all simulated radar signals with Instantaneous Frequency (IF) estimation performance are verified using Monte Carlo simulation meeting the requirements of the Cramer-Rao Lower Bound (CRLB) at SNR > 6 dB

Development of Threshold Levels and a Climate-Sensitivity Model of the Hydrological Regime of the High-Altitude Catchment of the Western Himalayas, Pakistan

Water shortages in Pakistan are among the most severe in the world, and its water resources are decreasing significantly due to the prevailing hydro-meteorological conditions. We assessed variations in meteorological and hydrological variables using innovative trend analysis (ITA) and traditional trend analysis methods at a practical significance level, which is also of practical interest. We developed threshold levels of hydrological variables and developed a non-parametric climate-sensitivity model of the high-altitude catchment of the western Himalayas. The runoff of Zone I decreased, while the temperature increased and the precipitation increased significantly. In Zone II, the runoff and temperature increased but the precipitation decreased. A two-dimensional visualization of the Pardé coefficient showed extreme drought events, and indicated greater sensitivity of the hydrological regime to temperature than to precipitation. The threshold levels of runoff for Zones I and II were 320 and 363 mm using the Q80 fixed method, while the mean runoff amounts were estimated to be 79.95 and 55.61 mm, respectively. The transient threshold levels varied by month, and the duration of droughts in Zones I and II ranged from 26.39 to 78.98 days. The sensitivity of the hydrological regime was estimated based on a modified climate-elasticity model (εp = 0.11–0.23, εt = −0.04–2.39) for Zones I and II, respectively. These results highlight the sensitivity of the hydrological regime to temperature, which influences the melting process. However, it is important to establish thresholds for hydrological variables and understand the climate sensitivity of the hydrological regime of the entire basin, so that policy makers and water managers can make sustainable water-resource-management decisions for this region