Penggunaan multimedia dalam pengajaran di kalangan guru-guru sekolah menengah kebangsaan di bahagian Samarahan, Sarawak

The purpose of this study is to identify the usage of multimedia in teaching among government secondary school teachers in Samarahan, Sarawak. A survey was carried out among 148 government secondary school teachers. The aspects studied were the usage of multimedia, skills in use of multimedia and attitude towards using multimedia. Data collected were analyzed using The Statistical Package for the Social Sciences (SPSS) version 12.0. The descriptive and inferential statistics were used to test the research question and hypotheses of the study. The studies findings show significant difference in usage of multimedia among national secondary school teachers in Samarahan, Sarawak based on working experience where namely significant value at p =.045 (*p<.05) and there is prominent difference in usage multimedia among non-graduates teachers with graduates teachers namely p =.020 (*p<.05). In terms of the teacher's skills in use of multimedia show significant difference on academic qualifications where non-graduates teachers mean (3.27) is lower than graduates teacher (3.48), Independent samples T-test illustrate significant value at p. =037 (*p<.05). All relevant null hypotheses concerning teachers' attitude toward usage of multimedia are all accepted in this studies and there is no significant difference between variable that examined on attitude towards using multimedia variable in this research. The outcome of studies also shows significant relation between usage of multimedia among teachers and teachers' skills in usage of multimedia among national secondary school teachers in Samarahan, Sarawak. Overall, this study findings indicate that multimedia usage among national secondary school teachers in Samarahan, Sarawak is on moderate and satisfactory stage and reveals that national secondary school teachers in Samarahan, Sarawak bear positive attitude towards using multimedia in teachin

A Facile Synthesis of Sn-Doped CeO2 Nanoparticles: High Performance Electrochemical Nitrite Sensing Application

Development of novel electrode materials for sensing water pollutant like nitrite, nitrate, paramedical pollutants and fertilizers is a more promising research area in electrochemical sensor field. Various pure as well as doped metal oxides were used as electrodes for sensing the water pollutants but, deficits in stability, reproducibility and real time analysis. In the present work, a promising Sn-doped CeO2 based sensor was fabricated for sensing nitrite in water. A selective concentration of Sn (5%) doped CeO2 nanoparticles were synthesized by facile chemical precipitation method. The structural, optical and morphological information were studied using various techniques. The morphological of the sample was revealed an agglomerated with spherical nanoparticles with size of 8.5 nm. The synergistic effect of Sn-CeO2/GCE improves the electrochemical behavior of nitrite on the modified surface. Sn-doped CeO2 nanoparticles has a better surface property and provides a more fine-grained media to facilitate electron transfer during the reaction between analyte and electrode. The Sn-CeO2/GCE electrode possesses excellent electrocatalytic oxidation of nitrite (NO2–) which was investigated by cyclic voltammetry (CV) and amperometry techniques. The remarkable sensitivities of nitrite were found that 245.4 µA cm−2 mM−1 and 89.53 µA cm−2 mM−1 with R2 = 0.999 and RSD of ∼ 6%. Similarly, the limit of detection (LOD) towards nitrite ion sensing was found to be 16 nM. The real time application of Sn-CeO2/GCE sensor was demonstrated by the detection of nitrite present in environmental water samples with excellent recoveries. Hence, Sn-doped CeO2 modified electrode also demonstrates good reproducibility, long time stability, and excellent selectivity properties. Thus, a developed electrochemical sensor possesses a novel promise for the construction of simple and sensitive nitrite analytical stage. © 2021 Elsevier B.V.The authors thank Chancellor, President and Vice Chancellor, Sathyabama Institute of Science and Technology, Chennai for the support and encouragement. The author R. Jothi Ramalingam thank for the financial support by the Researchers Supporting Project Number (RSP-2021/354), King Saud University, Riyadh, Saudi Arabia

Enhanced Room-Temperature Thermoelectric Performance of 2D-SnSe Alloys via Electric-Current-Assisted Sintering

Single-crystalline tin-selenide (SnSe) has emerged as a high-performance and eco-friendly alternative to the lead-chalcogens often used in mid-temperature thermoelectric (TE) generators. At high temperature &gt;800 K, the phase transition from Pnma to Cmcm causes a significant rise in the TE figure-of-merit (zT) curve. Conversely, the SnSe TE requires a booster at low temperatures, which allows broader applicability from a device perspective. Herein, a synergy of Cu alloy and Ag-coating is realized through a sequential multi-step synthesis, designed to combine different metal deposition effects. Single-crystalline (Cu2Se)x(SnSe)1&minus;x alloys grown by the Bridgman method were then coated with a thin Ag layer by radio frequency (RF) sputtering, and the interlayer epitaxial film was observed via electric-current assisted sintering (ECAS). Consequently, the thin Ag-coating improves the electrical conductivity (&sigma;) and reduces the thermal conductivity (&kappa;) for (Cu2Se)0.005(SnSe)0.995+Ag alloy, increasing the zT curve at close to room temperature (373 K). The incorporation of multistep addition by ECAS enables tuning of the overall solubility of the alloy, which opens a new avenue to optimize TE performance in anisotropic 2D materials

Biochemical and molecular study in diabetic infertile males

As per the statement by World Health Organization, Infertility is presence of a medical condition of the couple with inability in getting conceived for 1 year or more without usage of any contraception. In the present situation, the incidence of Infertility has increased and it is viewed as a major concern with affecting about 15% to 20% of the couples. A detailed systematic examination of history, investigative protocol is necessary for proper management of infertility. The patients were also advised for blood hormonal analysis tests such as Follicle Stimulation Hormone (FSH), Testosterone, Luteinizing Hormone (LH), Prolactin. Methylene tetrahydrofolate reductase (MTHFR) and methionine synthase reductase (MTRR) are the key enzymes in folate metabolism. The enzyme activities of MTHFR and MTRR are influenced by gene polymorphisms. So the polymorphisms of MTHFR and MTRR may be a potential risk factor for male infertility. The present study was done in 100 males, 50 diabetic infertile and 50 non-diabetic fertile men. Semen samples were obtained and analyzed as per the instructions given in the WHO manual for semen analysis [10]. A blood sample was collected and analyzed for the levels of FBS, FSH, LH, Prolactin and Testosterone

Study of biochemical and sperm parameters in infertile males with diabetes mellitus

World Health Organization has stated Infertility as a medical condition in which an individual has the inability to conceive even after one year of regular unprotected active sexual intercourse. Presently, Infertility has been a major condition, which is multifactorial in nature and is supposed to have been affected approximately about 15% to 20% of the couples who are desperate for pregnancy. The contributory factors for male infertility may be of different factors comprising of complex pathogenesis, change in lifestyle, other organic diseases, genetic factors, environmental risk factors and their interactions. The patients with subnormal semen parameters are advised for blood hormonal analysis tests as these hormonal tests are more reliable and valid in the further proper management of the infertility [11]. These hormonal tests include Follicle Stimulation Hormone (FSH), Testosterone, Luteinizing Hormone (LH), Prolactin. This cross section study was done in 100 males, 50 diabetic infertile men and 50 non-diabetic fertile men. Semen samples were obtained by masturbation after 2–7 days of sexual abstinence. The Semen Samples were analyzed as per the instructions given in the WHO manual for semen analysis.&nbsp

Enhanced Room-Temperature Thermoelectric Performance of 2D-SnSe Alloys via Electric-Current-Assisted Sintering

Single-crystalline tin-selenide (SnSe) has emerged as a high-performance and eco-friendly alternative to the lead-chalcogens often used in mid-temperature thermoelectric (TE) generators. At high temperature >800 K, the phase transition from Pnma to Cmcm causes a significant rise in the TE figure-of-merit (zT) curve. Conversely, the SnSe TE requires a booster at low temperatures, which allows broader applicability from a device perspective. Herein, a synergy of Cu alloy and Ag-coating is realized through a sequential multi-step synthesis, designed to combine different metal deposition effects. Single-crystalline (Cu2Se)x(SnSe)1−x alloys grown by the Bridgman method were then coated with a thin Ag layer by radio frequency (RF) sputtering, and the interlayer epitaxial film was observed via electric-current assisted sintering (ECAS). Consequently, the thin Ag-coating improves the electrical conductivity (σ) and reduces the thermal conductivity (κ) for (Cu2Se)0.005(SnSe)0.995+Ag alloy, increasing the zT curve at close to room temperature (373 K). The incorporation of multistep addition by ECAS enables tuning of the overall solubility of the alloy, which opens a new avenue to optimize TE performance in anisotropic 2D materials