Meningkatkan Kemampuan Siswa Menyelesaikan Perhitungan Untung Atau Rugi Dalam Perdagangan Dengan Menggunakan Persentase Melalui Metode Pemberian Tugas Pada Kelas VII a Mts Alkhairaat Pusat Palu

The study is classroom action research. It aims at improving students' ability in comleting/finising provit and loss calculation in trade by using percentage through assignment/task method (metode pemberian tugas). The subjeck of the study is student of VII A of MTs Alkhairaat Pusat Palu. The problem of the study is the lack of students' ability in completing/finising provit and loss calculation using percentage and its Application. Alternative of the problem used in the study is by appling assignment study method. Based on the observation done during the study, it indicates that there is improvement of the students' ability in completing/finising provit and loss calculation in trade ranging from first and second cycle. Before the cycle implemented (preliminary study), it was found out that the students' mastery learning was 20% or 6 students, that there were 80 % of the students or 24 students. Who did not gain the mastery learning and that the students' classical absorption was 52,5%. The result obtained in the first cycle was that the students' mastery learning was 36,67% or 11 students' that there were 63,33% of the student or 27 students who did not achieve the mastery learning, and that the students classical absorption was 65,56%. While in the second cycle, it was found out that, the students' mastery learning was 90% of the students (36 students), that there were 10% of the students (4 students) who did not gain the mastery learning, and that the students classical absorption was 87,17%. This the final result of the study it could be concluded that there wen students' improvement dealing with their classical absorption in comleting/finising provit and loss calculation, that was 26,60%

Meningkatkan Hasil Belajar Geometri Bangun Ruang Sisi Datar Dengan Menggunakan Alat Peraga Pada Kelas Viii-a Mts Alkhairaat Pusat Palu

Rendahnya pemahaman siswa MTs Alkhairaat Pusat Palu tentang materi Bangun ruang sisi datar merupakan permasalahan pokok dalam penelitian ini. Salah satu faktor yang menyebabkan rendahnya pemahaman tersebut adalah pendekatan pembelajaran yang digunakan oleh guru dalam menyampaikan materi bangun ruang tidak menggunakan alat peraga. Materi geometri bangun ruang sisi datar merupakan materi abstrak dari sekian pembahasan pada matematika, olehnya diperlukan cara pembalajaran yang dapat diterima oleh siswa secara realistis. Salah satu cara adalah dengan menggunakan alat peraga. Penerapan pembelajaran menggunakan alat dapat mempermudah pemahaman materi karena siswa akan lebih realistis untuk memahaminya sehingga dapat meningkatkan hasil belajar matematika terutama pada materi geometri bangun ruang. Penelitian ini dilaksanakan di Madrasah Tsanawiyah Alkhairaat Pusat Palu Propinsi Sulawesi Tengah dengan mengambil sampel kelas VIII-A sebanyak 29 siswa. Hasil penelitian menunjukkan bahwa terjadi peningkatan hasil belajar pada siklus I sampai pada siklus III. Sebelum dilaksanakan tindakan diperoleh daya serap klasikal 44,51%. Pada siklus I daya serap klasikal diperoleh 48,90 dan ketuntasan belajar 24,14%. Pada hasil kegiatan siklus II diperoleh daya serap klasikal 73,69% dan ketuntasan belajar mencapai 72,41%, sedangkan pada siklus III diperoleh hasil daya serap 85,82% dan ketuntasan belajar mencapai 93,10%. Dengan demikian hasil penelitian ini menunjukkan bahwa pembelajaran dengan menggunakan alat peraga dapat meningkatkan hasil belajar matematika pada materi bangun ruang

Perilaku Tiang Bor Penopang Infrastruktur Pada Tanah Lunak Akibat Beban Statik

Bored piles have been used to support transportation infrastructures (offices, a terminal building, power house, warehouses and workshop) in a harbor. The bored piles were penetrated into mostly old alluvial deposits and dilluvial deposits of very stiff marine clay with traces of shell debris. A bored pile was tested as part of this research program to verify the accuracy of the predicted pile capacities. The proposed static prediction capacity methods include Meyerhof, a, b and l methods. The results of the analysis show that Meyerhof method (1951) with inputs of laboratory test data provides closely agreement with static loading test results. The other methods give somewhat conservative prediction. This paper discusses bearing capacity analysis of bored piles based on soil characteristics and static loading test results. Results of the analysis indicate that the bored piles capable of resisting load transmitted from the upper structure. The research will be of interest to many practicing engineers using this kind of piles

Alternatif Pondasi Terowongan Layang Dalam Laut Untuk Prasarana Transportasi

A Submerged Floating Tunnel (SFT) is a tunnel that floats in water, supported by its buoyancy specifically by employing the hydrostatic thrust. In order to construct the foundation of the SFT, soil investigation has to be performed in advance. The soil investigation includes identification of subsurface soil profile, geotechnical index properties and parameters. Results of the soil investigation were used to he analyze and develop alternatives of the foundations for anchoring the prototype of the SFT. This paper discusses the alternatives of the foundations based on soil condition and applied tension leg. The research will be of interest to many practicing engineers and researchers regarding the subject matter

Antibacterial evaluation of Malaysian kelulut, tualang and acacia honey against wound infecting bacteria

Bacterial infection is the most common contamination on wound. Honey is one alternative plant by-product that can be used as treatment to the bacterial infection. This study aims to evaluate the antibacterial properties of Malaysian honey represented by Kelulut, Tualang and Acacia against fourteen clinically isolated bacteria strains from wound. Agar well diffusion assay was utilised to measure the diameter of inhibition zone. Determination of minimum inhibitory concentration and minimum bactericidal concentration were performed to evaluate the bacteriostatic and bactericidal effects of the honey. The antibacterial properties of Malaysian honey were compared with manuka honey (UMF 18+). Kelulut, Tualang and Acacia have the diameter of inhibition zones that ranged from 10.7 to 24.5 mm, 9.2 to 17.7 mm and no inhibition to 15.3 mm, respectively. Kelulut, Tualang and Acacia showed bacteriostatic effect against the bacteria at concentration of 50% (w/v) and below. Kelulut was the only honey that owned bactericidal effect against the fourteen bacteria while the effect was absence in Tualang and Acacia on E. coli, K. pneumonia, E. clocae and P. mirabilis. The antibacterial properties of Kelulut was comparable to manuka honey since both honey demonstrated bacteriostatic and bactericidal effects against the fourteen clinically isolated bacteria

Optimisation of topical antibacterial preparation from Malaysian kelulut honey by using xanthan gum as polymeric agent

The study aims to formulate and optimise topical antibacterial preparation by using Malaysian kelulut honey as the active ingredient and xanthan gum as the polymeric agent. Response surface methodology was used to optimise the preparation. The acidity, honey concentration and xanthan gum concentration were the independent variables. The zone of inhibitions on S. aureus ATCC6538 and E. coli ATCC8739 were the response variables. The optimal preparation was evaluated on its physicochemical properties, viscosity, antibacterial efficacy and stability. The antibacterial efficacy of the optimal preparation was compared to the commercially antibacterial gel (MediHoney™, Comvita). The optimal preparation was formulated at pH of 3.5, honey concentration of 90% (w/v) and xanthan gum concentration of 1.5% (w/v) with the inhibition zones measured on S. aureus ATCC6538 was 16.2 mm and E. coli ATCC8739 was 15.8 mm respectively. The factors of acidity and honey concentration have significantly influenced the inhibition zone on S. aureus ATCC6538 and E. coli ATCC8739. The utilisation of xanthan gum as the polymeric agent was fit for the preparation which showed by adequate physicochemical properties and retained of the antibacterial effects. This was supported by constant viscosity and efficacy of the preparation within the six months of stability study indicating stable and reliable preparation. Xanthan gum is a potential polymeric agent due to its effective use in preparing stable preparation with effective antibacterial properties

The Effect of Layer Thickness on Stress Ratio and Fatigue Service Life of Plain Concrete Slab Track Structure

Indonesia has been developing a high-speed railway. Therefore, it is necessary to study slab track design configuration, which is convenient and efficient, by considering the country's environmental, geological, and geographical conditions. This paper discusses the effect of the layer thickness on the stress ratio and fatigue service life of slab track layers. The Finite Element Method (FEM) analysis was performed to numerically simulate the maximum moment caused by 180 kN of axle load. Subsequently, the classic calculation of stress ratio and fatigue service life was conducted for various layer thicknesses. The same materials specifications, axle load, and the value of subgrade reaction were applied for all slab track configurations with various thicknesses. The results indicate that the thicker each layer is, the lower stress ratio and the higher fatigue service life. The thicknesses influence the contribution of each layer in resisting the axle load in the slab track system. The slab track design is still conservative because friction between each layer of the slab track design configuration was not considered. The analysis was conducted for plain concrete slab without any reinforcement. The results are interesting for practicing engineers and researchers, and more case studies might be beneficial

The Effect of Layer Thickness on Stress Ratio and Fatigue Service Life of Plain Concrete Slab Track Structure

Indonesia has been developing a high-speed railway. Therefore, it is necessary to study slab track design configuration, which is convenient and efficient, by considering the country's environmental, geological, and geographical conditions. This paper discusses the effect of the layer thickness on the stress ratio and fatigue service life of slab track layers. The Finite Element Method (FEM) analysis was performed to numerically simulate the maximum moment caused by 180 kN of axle load. Subsequently, the classic calculation of stress ratio and fatigue service life was conducted for various layer thicknesses. The same materials specifications, axle load, and the value of subgrade reaction were applied for all slab track configurations with various thicknesses. The results indicate that the thicker each layer is, the lower stress ratio and the higher fatigue service life. The thicknesses influence the contribution of each layer in resisting the axle load in the slab track system. The slab track design is still conservative because friction between each layer of the slab track design configuration was not considered. The analysis was conducted for plain concrete slab without any reinforcement. The results are interesting for practicing engineers and researchers, and more case studies might be beneficial

0.12 µm GATE LENGTH In0.52Al0.48As/In0.53Ga0.47As HEMTs on transferred substrate

New In0.52Al0.48As/In0.53Ga0.47As transferred-substrate high electron mobility transistors (TS-HEMTs) have been successfully fabricated on 2 inch Silicon substrate with 0.12 µm T-shaped gate length. These new TS-HEMTs exhibit typical drain currents of 450 mA/mm and extrinsic transconductance up to 770 mS/mm. An extrinsic current cutoff frequency fT of 185 GHz is obtained. That result is the first reported for In0.52Al0.48As/In0.53Ga0.47As TS-HEMTs on Silicon substrate