PENGEMBANGAN MEDIA PEMBELAJARAN BERBASIS E-LEARNING MATA PELAJARAN MIKROPROSESOR DAN MIKROKONTROLER DI SMK NEGERI 10 MAKASSAR

Penelitian ini bertujuan untuk : (1) Pengembangkan media pembelajaran berbasis E-Learning dengan menggunakan aplikasi Kelase pada mata pelajaran Mikroprosesor dan Mikrokontroler. (2) Kelayakan media pembelajaran pada mata pelajaran Mikroprosesor dan Mikrokontroler berbasis ELearning dengan menggunakan aplikasi Kelase di SMK Negeri 10 Makassar. Jenis penelitian ini menggunakan jenis penelitian dan pengembangan yang memiliki tujuan untuk menghasilkan dan untuk pengembangan suatu produk. Mengacu pada prosedur pengembangan ADDIE. Adanpun hasil tahap pengembangan media pembelajaran dan uji kelayakan media yaitu pada hasil validasi Ahli Media 1 mendapatkan rata-rata skor presentase penilaian dari keempat aspek sebesar 94% maka dapat dinyatakan dalam kategori “Sangat Layak”. Pada hasil validasi Ahli Media 2 mendapatkan rata-rata skor presentase penilaian dari keempat aspek sebesar 91% maka dapat dinyatakan dalam bagian “Sangat Layak”. Pada hasil respon Guru mata pelajaran mikroprosesor dan mikrontroler mendapatkan rata-rata skor presentase penilaian dari keempat aspek sebesar 92% maka dapat dinyatakan dalam bagian “Sangat Layak”. Pada hasil respon oleh Siswa Kelompok One to One mendapatkan rata-rata skor presentase penilaian dari keempat aspek sebesar 97 maka dapat dinyatakan dalam bagian “Sangat Layak”. Pada hasil respon oleh Siswa Kelompok Kecil mendapatkan rata-rata skor presentase penilaian dari keempat aspek sebesar 91% maka dapat dinyatakan dalam bagian “Sangat Layak”. dan Pada hasil Respon oleh Siswa Kelompok Besar mendapatkan rata-rata skor presentase penilaian dari keempat aspek sebesar 97% maka dapat dinyatakan dalam bagian “Sangat Layak”, Sehingga media pembelajaran berbasis Elearning dengan menggunakan aplikasi Kelase dinyatakan dapat dipergunakan sebagai media pembelajaran dan dikatakan Sangat Layak dilanjutkan pada tahap penelitian selanjutnya. Saran untuk penelitian selanjutnya yaitu untuk melakukan tahap penelitian selanjutnya terhadap media pembelajaran menggunakan aplikasi kelase pada mata pelajaran Mikroprosesor dan Mikrokontroler yang belum dilakukan penulis pada penelitian ini dan untuk memperkuat hasil penelitian ini peneliti menyarankan untuk memakai simbol matematika ≥ 61- 80% dan ≥ 81-100% sebagai syarat kelayakan produk. Kata kunci : Media Pembelajaran, Kelase, Mikroprosesor dan Mikrokontrole

An inhibitive determination method for heavy metals using tomato crude proteases

A new inhibitive heavy metals determination method using extract from Lycopersicon esculentum or tomato from has been developed. The enzyme was assayed using the casein-Coomassie-dye-binding method. In the absence of inhibitors, casein was hydrolysed to completion and the Coomassie-dye was unable to stain the protein and the solution became brown. In the presence of metals, the hydrolysis of casein was inhibited and the solution remained blue. The inhibitions shown by lead, chromium and zinc were, 67.9, 53.1 and 53 %, respectively. The IC50 (concentration causing 50% inhibition) values were 1.407, 0.835 and 0.707 mg/l, respectively. The limits of quantitation (LOQ), for zinc, chromium and lead were 0.729, 0.506 and 0.541 mg/l, respectively. The limits of detection (LOD) for zinc, chromium and lead were 0.032, 0.0317 and 0.0317 mg/l, respectively. The IC50 value for zinc was much lower than the IC50 values for papain and Rainbow trout assays. The IC50 value for zinc was lower than the immobilized urease assay. Other toxic heavy metals, such as silver, arsenic, copper, mercury and cadmium, did not inhibit the crude proteolytic enzyme activity. Based on the characteristics, crude protease enzyme from L. esculentum (tomato) can be used to detect heavy metals in various samples in conjunction with the dye-binding assay

Effect Of Bio-Based Lubricant Towards Emissions And Engine Breakdown Due To Spark Plug Fouling In A Two-Stroke Engine

Two-stroke also known as two-cycle gasoline engine is a spark ignition engine. Its uniqueness to the four-stroke engine is that this engine does not require lubricant sump, which makes construction lightweight and simple. Its lubricant is mixed with gasoline and burnt together during combustion. There are reports which stated that higher spark plug fouling is due to carbon deposition on the spark plug electrodes on a two-stroke engine when compared to the four-stroke. While many factors could have affected this situation, however, in this paper, the effect of mineral and bio-based lubricants towards carbon deposition and emissions are studied and reported. Idle, half and full throttle operation modes had been conducted on a two-stroke, 43 cubic centimeter engine. To keep combustion temperature below self-cleaning temperature on all three modes of operation, a zero-load test was utilized. This situation accelerates the deposition process as low temperature causes incomplete combustion. This could lead to the accumulation of char, unburned fuel, as well as condensed water and acids as the byproducts blanket the spark plug electrodes and the exhaust system. Five samples had been prepared with a commercially available mineral lubricant (T0) as reference. Trimethylolpropane Trioleate, TMPTO derived from plant origin was used as the bio-based candidate. It was then mixed with T0 which created another four lubricant samples namely T10, T15, T20 and T50 with 10%, 15%, 20% and 50% TMPTO accordingly. Results show that mineral lubricant T0 delivers the lowest hydrocarbon HC, carbon monoxide CO and smoke opacity during idle and half throttle operations. However, it exhibits a greasy deposit on the spark plug circumference and dry carbon deposits on its insulator tip. T0 also emits a liquid residue at the exhaust manifold. T10 and T50 show a wet deposit blanketing both electrodes. Severe deposition was recorded by T50 that caused the engine to fail half way with its emissions had the worst recording. T15 and T20 exhibit only dry carbon deposition on the spark plug circumference. However, T20 has outperformed T15 in terms of emissions with lower CO and CO2 emissions during idling and half-throttling. With better emissions than T15 and better carbon deposition than mineral (T0), T20 could be proposed to be used as a commercial two-stroke lubricant

Quantification of Dynamic 11C-Phenytoin PET Studies

The overexpression of P-glycoprotein (Pgp) is thought to be an important mechanism of pharmacoresistance in epilepsy. Recently, 11C-phenytoin has been evaluated preclinically as a tracer for Pgp. The aim of the present study was to assess the optimal plasma kinetic model for quantification of 11C-phenytoin studies in humans. Methods: Dynamic 11C-phenytoin PET scans of 6 healthy volunteers with arterial sampling were acquired twice on the same day and analyzed using single- and 2-tissue-compartment models with and without a blood volume parameter. Global and regional test– retest (TRT) variability was determined for both plasma to tissue rate constant (K1) and volume of distribution (VT). Results: According to the Akaike information criterion, the reversible single-tissue-compartment model with blood volume parameter was the preferred plasma input model. Mean TRT variability ranged from 1.5% to 16.9% for K1 and from 0.5% to 5.8% for VT. Larger volumes of interest showed better repeatabilities than smaller regions. A 45-min scan provided essentially the same K1 and VT values as a 60-min scan. Conclusion: A reversible single-tissue-compartment model with blood volume seems to be a good candidate model for quantification of dynamic 11C-phenytoin studies. Scan duration may be reduced to 45 min without notable loss of accuracy and precision of both K1 and VT, although this still needs to be confirmed under pathologic conditions

Tribological improvement using ionic liquids as additives in synthetic and bio-based lubricants for steel-steel contacts

This study investigates the performance of three ionic liquids (ILs), trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate, trihexyl(tetradecyl)phosphonium decanoate, and 1-butyl-3-methylimidazolium tetrafluoroborate, as lubricant additives in synthetic oil polyalphaolefin (PAO8) and bio-based oil trimethylolpropane trioleate (TMPTO). The ILs were added at 0.5, 1.0, and 1.5 wt% concentrations and evaluated in terms of their miscibility with base oils as well as friction- and wear-reducing abilities. Four-ball and high-frequency reciprocating rig (HFRR) tribotesters were employed to evaluate the tribological performance under a boundary lubrication regime. Worn steel surfaces were characterized using optical microscopy, profilometry, scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) analysis. The results suggested that the addition of trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate and trihexyl(tetradecyl)phosphonium decanoate improved the tribological performance of both PAO8 and TMPTO at an optimum concentration of 1 wt%. They showed good friction reduction, lower overall surface wear, and improved surface finishing. 1-Butyl-3-methylimidazolium tetrafluoroborate managed to improve the tribological performance of both base oils only at 0.5 wt%. A further increase in 1-butyl-3-methylimidazolium tetrafluoroborate concentration caused detrimental effects on the steel surface due to the formation of halogenic compounds

Impact of New Scatter Correction Strategies on High-Resolution Research Tomograph Brain PET Studies

The aim of this study is to evaluate the impact of different scatter correction strategies on quantification of high-resolution research tomograph (HRRT) data for three tracers covering a wide range in kinetic profiles. Healthy subjects received dynamic HRRT scans using either (R)-[C-11]verapamil (n = 5), [C-11]raclopride (n = 5) or [C-11]flumazenil (n = 5). To reduce the effects of patient motion on scatter scaling factors, a margin in the attenuation correction factor (ACF) sinogram was applied prior to 2D or 3D single scatter simulation (SSS). Some (R)-[C-11]verapamil studies showed prominent artefacts that disappeared with an ACF-margin of 10 mm or more. Use of 3D SSS for (R)-[C-11]verapamil showed a statistically significant increase in volume of distribution compared with 2D SSS (p 0.05). When there is a patient motion-induced mismatch between transmission and emission scans, applying an ACF-margin resulted in more reliable scatter scaling factors but did not change (and/or deteriorate) quantification

Sensitive and specific protein sensing using single-mode tapered fiber immobilized with biorecognition molecules

We examine and demonstrate a biosensor using single-mode tapered fiber that has been immobilized with biorecognition molecules to sense targeted proteins. Interaction of evanescent waves with the external medium surrounding the tapered region produces an interferometric-patterned spectrum, which shifts correspondingly to any changes of refractive index (RI) in the external medium. The proposed setup managed to obtain an RI sensitivity and concentration sensitivity of 2526.8 nm/RIU and 20.368 nm/μM, respectively, which, to our knowledge, is highly sensitive when compared with previous studies. The dynamic performance, good specificity, and high sensitivity of the proposed method highlight an immensely beneficial choice for immunological diagnostics

Development of a bacterial-based tetrazolium dye (MTT) assay for monitoring of heavy metals

An inhibitive assay for metals using a bacterial respiratory assay system is presented. The assay is based on the ability of bacteria to reduce the water soluble tetrazolium dye (MTT). The isolate was tentatively identified as Bacillus sp. strain Khayat. The Bacillus sp based MTT assay is sensitive towards Hg2+, Cu2+, Ag2+, Cd2+ and Zn2+ with concentration of toxicant giving 50% inhibition (IC50) values at 0.046, 0.057, 0.044, 0.857 and 1.716 mg/L, respectively. A Limit of Detection (LOD) value was 0.001 mg/L for Hg2+ and Cu2+ while 0.003, 0.067 and 0.201 mg/L, respectively for Ag2+, Cd2+ and Zn2+. This assay is xenobiotics and pesticide tolerance and can be completed within 20 min. Field test on identify polluted water sample from Bukit Tinggi Industrial Estate, Penang and Bukit Tinggi Industrial Estate, Penang proved that Bacillus sp-based MTT assay was sensitive in toxic response

Effect of alcoholic and nano-particles additives on tribological properties of diesel–palm–sesame–biodiesel blends

This study focused on evaluating the lubricity of diesel–biodiesel fuel with oxygenated alcoholic and nano-particle additives. Fuel injection system lubrication depended primarily on the fuel used in the diesel engine. Palm–sesame oil blend was used to produce biodiesel using the ultrasound-assisted technique. B30 fuel sample as a base fuel was blended with fuel additives in different proportions prior to tribological behavior analysis. The lubricity of fuel samples measured using HFRR in accordance with the standard method ASTM D6079. All tested fuels’ Tribological behavior examined through worn steel balls and plates using scanning electron microscopy (SEM) to assess wear scar diameter and surface morphology. During the test run, the friction coefficient was measured directly by the HFRR tribometer system. The results exhibited that B10 (diesel) had a very poor coefficient of friction and wear scar diameter, among other tested fuels. The addition of oxygenated alcohol (ethanol) as a fuel additive in the B30 fuel sample decreased the lubricity of fuel and increased the wear and friction coefficient, among other fuel additives. B30 with DMC showed the least wear scar diameter among all tested fuels. B30 with nanoparticle TiO2 exhibited the best results with the least wear scar diameter and lowest friction coefficient among all other fuel samples. B30+DMC demonstrated significant improvement in engine performance (BTE) and carbon emissions compared to different tested samples. B30+TiO2 also showed considerable improvement in engine characteristics

Pengaruh Entertainment, Irritating dan Informativeness terhadap Nilai Iklan dan Sikap terhadap Periklanan di Web di Kalangan Mahasiswa di Jakarta Barat

The growth of advertising on the World Wide Web requires research on users' general perceptions since these attitudes toward individual advertisements. This article presents results of a survey among university students focusing on the perceived value of Web Advertising in the general media. Both the hypothesized model of advertising value and its role as an antecedent of overall audience attitudes are confirmed