Penerapan Metode Demonstrasi Dapat Meningkatkan Hasil Belajar IPA Pada Siswa Kelas IV SD Inpres I Sidole

Penelitian tindakan kelas yang berjudul Penerapan Metode Demonstrasi dapat Meningkatkan Hasil Belajar IPA pada Siswa Kelas IV SD Inpres I Sidole. Penelitian ini dilakukan dalam dua siklus, setiap siklus terdiri dari empat tahap yang mengacu pada model Kemmis dan Mc Taggart yaitu perencanaan, pelaksaan tindakan, observasi dan refleksi. Sumber data penelitian adalah siswa kelas IV SD Inpres 1 Sidole yanng berjumlah 15 orang. Pada penelitian ini data dikumpulkan melalui lembar observasi aktivitas guru dan siswa, tes hasil belajar siswa. Hasil penelitian menunjukkan bahwa aktivitas siswa dan guru mengalami peningkatan yang cukup berarti dari siklus I ke siklus II. Hasil ketuntasan klasikal pada siklus I adalah 66,67% dan daya serap klasikal adalah 69,2%. Hasil ketuntasan klasikal pada siklus II adalah 93.3% dan hasil presentase daya serap klasikal siklus II adalah 77,73%. Hal ini menunjukkan persentase peningkatan hasil belajar IPA dari siklus I ke siklus II pada ketuntasan klasikal sebesar 26,63% dan daya serpa klasikal sebesar 8.73%. Hasil penelitian ini menunjukan bahwa pembelajaran dengan penerapan metode demonstrasi dapat meningkatkan hasil belajar IPA siswa kelas IV SD Inpres I sidole

Transient electrothermal simulation of power semiconductor devices

In this paper, a new thermal model based on the Fourier series solution of heat conduction equation has been introduced in detail. 1-D and 2-D Fourier series thermal models have been programmed in MATLAB/Simulink. Compared with the traditional finite-difference thermal model and equivalent RC thermal network, the new thermal model can provide high simulation speed with high accuracy, which has been proved to be more favorable in dynamic thermal characterization on power semiconductor switches. The complete electrothermal simulation models of insulated gate bipolar transistor (IGBT) and power diodes under inductive load switching condition have been successfully implemented in MATLAB/Simulink. The experimental results on IGBT and power diodes with clamped inductive load switching tests have verified the new electrothermal simulation model. The advantage of Fourier series thermal model over widely used equivalent RC thermal network in dynamic thermal characterization has also been validated by the measured junction temperature

Hubungan Jarak Sumur dari Sungai Tercemar Limbah Tapioka dengan Kadar Sianida

Tujuan penelitian ini untuk mengetahui hubungan antara jarak sumur gali dari tempat pembuangan limbah cair tapioka dengan kadar sianida air sumur gali di Desa Ngemplak Kidul Kecamatan Margoyoso Kabupaten Pati. Jenis penelitian à explanatory menggunakan pendekatan belah lintang. Populasi penelitian adalah sumur gali yang berjarak à 25 m, dengan kedalaman à 15 m, berjumlah 50. Sampel yang diambil sejumlah 33 diperoleh dengan teknik purposif. Data primer diolah dengan statistik uji chi square dengan tingkat kemaknaan 0,05. Hasil penelitian menunjukkan bahwa sumur gali yang berada pada jarak aman dengan kadar sianida memenuhi standar sejumlah 15 (65,2 %) dan yang tidak memenuhi standar sejumlah 8 (34,8 %). Untuk sumur gali yang berada pada jarak tidak aman dengan kadar sianida tidak memenuhi standar ada 10 (100 %). Dari uji statistik didapatkan p=0,001 (< 0,05) ada hubungan antara jarak sumur gali dari tempat pembuangan limbah cair tapioka dengan kadar sianida air sumur gali di Desa Ngemplak Kidul Kecamatan Margoyoso Kabupaten Pati.à AbstractThe research objective was to determine the relationship between distance from wells dug from tapioka liquid waste disposal sites with high levels of cyanide water wells dug in the village district of South Ngemplak Margoyoso District Pati. Explanatory research is made using cross sectional approach. The population consist of 50 as far as 25m, 15m in depth. Samples a number of 33 were obtained by purposive technique. Primary data was processed using chi square test with a significance level of 0.05. The results showed that dug wells are located at a safe distance with high level of cyanide in agreeement with standard a number of à 15 (65.2%) and that do not amount of 8 (34.8%). Wells located at a distance are not safe with cyanide levels are not in agreement with standard amount of 10 (100%). From statistical, p value is found as well as p=0.001 (<0.05). In conclusion, there is a relationship between distance from wells with high levels of cyanide water wells dug in the village of South Ngemplak Sub District Pati Margoyoso.Keywords:à Dig the well distance; Levels of cyanide; Tapioka wastewate

The Horizontal Branch of NGC 1851: Constraints from its RR Lyrae Variables

We use the pulsational properties of the RR Lyrae variables in the globular cluster NGC 1851 to obtain detailed constraints of the various sub-stellar populations present along its horizontal branch. On the basis of detailed synthetic horizontal branch modeling, we find that minor helium variations (Y~0.248-0.280) are able to reproduce the observed periods and amplitudes of the RR Lyrae variables, as well as the frequency of fundamental and first-overtone RR Lyrae stars. Comparison of number ratios amongst the blue and red horizontal branch components and the two observed subgiant branches also suggest that the RR Lyrae variables originated from the progeny of the bright subgiant branch. The RR Lyrae variables with a slightly enhanced helium (Y~0.270-0.280) have longer periods at a given amplitude, as is seen with Oosterhoff II (OoII) RR Lyrae variables, whereas the RR Lyrae variables with Y~0.248-0.270 have shorter periods, exhibiting properties of Oosterhoff I (OoI) variables. This correlation does suggest that the pulsational properties of RR Lyrae stars can be very useful for tracing the various sub-populations and can provide suitable constraints on the multiple population phenomenon. It appears of great interest to explore whether this conclusion can be generalized to other globular clusters hosting multiple populations.Comment: accepted to A

Highs and Lows in English Attachment

Grillo and Costa (2014) claim that Relative-Clause attachment ambiguity resolution is largely dependent on whether or not a Pseudo-Relative interpretation is available. Data from Italian, and other languages allowing Pseudo-Relatives, support this hypothesis. Pseudo-Relative availability, however, covaries with the semantics of the main predicate (e.g., perceptual vs. stative). Experiment 1 assesses whether this predicate distinction alone can account for prior attachment results by testing it with a language that disallows Pseudo-Relatives (i.e. English). Low Attachment was found independent of Predicate-Type. Predicate-Type did however have a minor modulatory role. Experiment 2 shows that English, traditionally classified as a Low Attachment language, can demonstrate High Attachment with sentences globally ambiguous between a Small-Clause and a reduced Relative-Clause interpretation. These results support a grammatical account of previous effects and provide novel evidence for the parser’s preference of a Small-Clause over a Restrictive interpretation, crosslinguistically

Freestyle race pacing strategies (400 m) of elite able-bodied swimmers and swimmers with disability at major international championships

Freestyle race pacing strategies (400 m) were compared between elite able-bodied swimmers and those with minimal physical (International Paralympic Committee S10 classification) and visual disabilities (International Paralympic Committee S13 classification). Data comprised 50-m lap splits and overall race times from 1176 400-m freestyle swims from World Championships, European Championships and Olympic/Paralympic Games between 2006 and 2012. Five pacing strategies were identified across groups (even, fast start, negative, parabolic and parabolic fast start), with negative and even strategies the most commonly adopted. The negative pacing strategy produced the fastest race times for all groups except for female S13 swimmers where an even strategy was most effective. Able-bodied groups swam faster than their S10 and S13 counterparts, with no differences between S10 and S13 groups. The results suggest adoption of multiple pacing strategies across groups, and even where impairments are considered minimal they are still associated with performance detriments in comparison to their able-bodied counterparts. The findings have implications for the planning and implementation of training related to pacing strategies to ensure optimal swimmer preparation for competition. Analogous performance levels in S10 and S13 swimmers also suggest a case for integrated competition of these classifications in 400-m freestyle swimming