PENGARUH ANIMASI BERGERAK TERHADAP PEMAHAMAN KONSEP MATEMATIKA SISWA KELAS XII DI SMAN 1 LANGSA

Pemahaman konsep merupakan suatu kemampuan yang sangat penting dalam pembelajaran matematika. Dengan kemampuan pemahaman konsep siswa akan mampu memanfaatkan atau mengaplikasikan apa yang telah dipahaminya serta mengungkapkannya kembali dengan makna yang sama dalam kegiatan belajar. Tujuan dalam penelitian ini adalah untuk mengetahui apakah animasi bergerak dengan berbantuan software Cabri 3D berpengaruh terhadap pemahaman konsep matematika siswa pada materi dimensi tiga. Penelitian ini dilaksanakan di SMAN 1 Langsa tahun ajaran 2019/2020. Penelitian ini termasuk dalam jenis penelitian kuantitatif dengan desain One Group Pretest-Posttest Design. Populasi dalam penelitian ini adalah seluruh siswa  kelas XII SMA Negeri 1 Langsa sebanyak 317 orang yang terdiri dari 10 kelas, sedangkan sampelnya adalah siswa kelas XII MIA-8 dengan jumlah siswa 32 orang. Hasil penelitian menunjukkan bahwa thitung = 22,88 dan ttabel = 1,696 maka thitung  >  ttabel yaitu 22,88 > 1,696 sehingga diperoleh H0 ditolak dan Ha diterima. Dengan demikian dapat disimpulkan bahwa terdapat pengaruh animasi bergerak terhadap pemahaman konsep matematika siswa kelas XII di SMA Negeri 1 Langsa

Content Validation of KIP-K Scholarship Instruments at Higher Education Using Aiken's Coefficient Validity Scale

This study aims to analyze the KIP-K Scholarship instrument at PTKIN IAIN Langsa while developing non-test instruments (questionnaires). This instrument is used to obtain information about students who apply for KIP-K scholarships. The instrument's content validity is obtained by a quantitative analysis approach by nine selected experts and a qualitative approach with an expert review of a set of questionnaires that have been arranged. In determining the content validity and reliability level, the experts analyzed a questionnaire quantitatively consisting of 29 items in the three components; economic, household, and academic and non-academic students’ achievements. The data from this expert judgment is calculated by the formula Aiken V. While expert reviews are qualitatively similar to suggestions and feedback, they are used to refine constructed items. The result of these students’ economic condition, household, and academic and non-academic achievements was above 0.72 with a significance level of 5%, namely 0.92, 0.96, and 0.96. All of the 29 items are very valid (V > 0.72, V1 > 0.50) and reliable (α = 0,944). The conclusion that each component is closely related indicates information on the feasibility of distributing KIP-K. The instruments embodied at IAIN Langsa have high validity, and the level of reliability is excellent. This instrument can obtain complete information on prospective students who will become KIP-K scholarship recipients in 2022

Students talk about difficulties they have in solving math problems

The ability to solve students' mathematical problems cannot be diagnosed clearly just by using test questions; it must also be seen by looking at students' responses to the problem-solving process. As a result, the purpose of this study is to investigate students' mathematical problem-solving skill as well as their responses to the problem-solving process. This study is descriptive-qualitative in nature. Three junior high schools (SMP) in Aceh participated in this study, with 76 class VIII students serving as research subjects. Tests, observations, and interviews were used as data collection techniques. Quantitative data were descriptively analyzed using proportions, while qualitative data were descriptively analyzed using coding. The results showed that 25 percent of students wrote down what was known and asked, which was an indication of problem comprehension; 21 percent of students were able to devise problem-solving strategies; and 15 percent of students had done calculations correctly. correct, 11 percent of students checked their answers again. Based on the responses given by students, there were some difficulties experienced by students when solving math problems, namely difficulty understanding reading texts, using mathematical terms, making problem connections, making decisions, uncertainty in solving problems, time, carelessness, and boredom. The findings of this study are expected to serve as a resource for teachers and education practitioners in developing focus, discipline, and patience in problem solving and selecting learning models appropriate to the needs of their students

Mapping of urban above-ground biomass with high resolution remote sensing data

This paper reports on study carried out to determine and map the distributions and density of the urban total above-ground biomass (TAGB) content using high resolution satellite data of the SPOT-4 and Quickbird, with respective 10 and 4 meter spatial resolution for mapping two levels of urban biomass, Level I biomass derived at selected residential areas in Johor Bahru city urban landscape, and Level II biomass derived from SPOT-4 data in for the entire urban district (including the suburbs). The results of this study indicated that, Level I and Level II of biomass were derived at respective accuracy of ±0.3kgm-2 and ±0.4kgm-2, validated with in-situ verification

Apparent stress-strain relationships in experimental equipment where magnetorheological fluids operate under compression mode

Abstract: This paper presents an experimental investigation of two different magnetorheological ( MR) fluids, namely, water-based and hydrocarbon-based MR fluids in compression mode under various applied currents. Finite element method magnetics was used to predict the magnetic field distribution inside the MR fluids generated by a coil. A test rig was constructed where the MR fluid was sandwiched between two flat surfaces. During the compression, the upper surface was moved towards the lower surface in a vertical direction. Stress-strain relationships were obtained for arrangements of equipment where each type of fluid was involved, using compression test equipment. The apparent compressive stress was found to be increased with the increase in magnetic field strength. In addition, the apparent compressive stress of the water-based MR fluid showed a response to the compressive strain of greater magnitude. However, during the compression process, the hydrocarbon-based MR fluid appeared to show a unique behaviour where an abrupt pressure drop was discovered in a region where the apparent compressive stress would be expected to increase steadily. The conclusion is drawn that the apparent compressive stress of MR fluids is influenced strongly by the nature of the carrier fluid and by the magnitude of the applied current

Physico-chemical properties of the oils and fat from crotalaria cleomifolia seeds

The seeds of C. cleomifolia (locally known as kacang hantu) collected along Simpang Pulai - Berinchang Road, Cameron Highlands, was defatted with hexane and the resulting oil was analysed for their physico-chemical properties. The percentage yield of the oil was calculated as 5.3%. The acid value (1.2%), iodine value (85), peroxide value (0.6), saponification value (192.0) and unsaponifiable matter (2.3%) were determined to assess the quality of the oil. The physico-chemical characterisation showed that C. cleomifolia seeds oil is unsaturated semi-drying oil, with high saponifi cation and acidic values. The fatty acid composition of C. cleomifolia seed oil was determined by Gas Chromatography and Gas Chromatography-Mass Spectrometry (ToF). The seed oil of C. cleomifolia contained linoleic acid (57.59%) and palmitic acid (5.07%), the most abundant unsaturated and saturated fatty acids, respectively. The polyunsaturated triacylglycerol (TAG) in C. cleomifolia seed oil determined by reverse phase High performance Liquid Chromatography; contained as PLL (18.04%) followed by POL + SLL (11.92%), OOL (7.04%) and PLLn (6.31%). The melting and cooling point of the oil were 16.22°C and -33.54°C, respectively

The Concept of Single Use Piston Break Safety Syringe

syringe is a simple piston pump consisting of a plunger that fits tightly in a tube. The plunger can be pulled and pushed along inside a cylindrical tube (the barrel), allowing the syringe to take in and expel a liquid or gas through an orifice at the open end of the tube. The open end of the syringe may be fitted with a hypodermic needle, a nozzle, or tubing to help direct the flow into and out of the barrel. Syringes are often used to administer injections, apply compounds such as glue or lubricant, and measure liquids. The reuse and abuse of syringe has led to cross-infection of diseases; thus, the need of single use safety syringe arises. Single use safety syringe is able to prevent the abuse of syringe. Many inventions have been produced; the most common are through-push retract breakable safety syringe, rotary plunger retractable safety syringe and release-ring breakable safety syringe. A new type of single use safety syringe Piston Break Safety Syringe is discussed in this paper. Common safety syringes available in market consist of three major components as described earlier. Beside its simplicity, the low cost to produce also the main factor why this type is very popular. The new Piston Break Safety Syringe has similar design with this widely used safety syringe; hence, it makes it easier to be adapted by the users due to its similarity, since no extra training to use it is required. The cost should be equivalently low due to the similarity in size, design and number of components

Finite element analysis of osteoporotic vertebrae with first lumbar (L1) vertebral compression fracture

The aim of this work is to assess the biomechanical response or load transfer response between osteoporotic (with first lumbar (L1) vertebral compression fracture) and healthy vertebrae in five vertebral physiological motions namely as compression, flexion, extension, lateral bending and axial rotation. For this purpose, an image-based heterogeneous three-dimensional patient-specific of lumbar and thoracic spinal unit (T12-L2) finite element models for healthy and osteoporotic subjects were created. The finite element analysis have shown that one of the most significant effects of osteoporosis is the tendency to produce higher stress and strain in the cancellous region of the vertebral body. The maximum stress and strain was 4.53 fold (compression) and 5.43 fold (axial rotation) higher for the osteoporotic than the healthy subject, respectively, under the similar loading activity. Uneven stress distribution patterns also have been detected in the osteoporotic vertebrae rather than the healthy vertebrae. All of these characteristics are reflected by a reduced structural strength and bone mass which might lead to an increased risk of fracture. These results strengthen the paradigm of a strong relationship between osteoporosis and its high susceptibility to fracture

Antimicrobial activity of fingerroot [Boesenbergia rotunda (L.) Mansf. A.] extract against streptococcus mutans and streptococcus sobrinus

The extract of medicinal plants fingerroot [Boesenbergia rotunda (L.) Mansf. A.] obtained using 100% methanol was tested for antibacterial activity against two major pathogen of dental carries namely Streptococcus mutans KCCM 3309 and Streptococcus sobrinus KCCM 3207. The minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC) and time-kill curve on S. mutans and S. sobrinus were analyzed using Clinical and Laboratory Standard Institutes (CLSI) methods. Preliminary antimicrobial screening showed the mean zones of inhibition for S. mutans (9.0 mm) and S. sobrinus (8.0 mm). MIC value obtained for S. sobrinus and S. mutans was 313 μg/ml while the MBC values were 313 μg/ml (S.mutans) and 625 μg/ml (S. sobrinus). Time-kill curve were obtained at concentrations of 0xMIC, 1/2xMIC, 1xMIC, 2xMIC, 4xMIC and 8xMIC. S. mutans was found to be more susceptible to the fingerroot extract than S. sobrinus. Time - kill curve showed that the concentration of 8xMIC was able to kill 99.9% of S. mutans after 4 hours treatment. These results may be useful for developing fingerroot B. rotunda as natural anticariogenic agent in toothpaste or any oral care products such as mouthwash in treatment of dental carries, sore throat and flaming gums

Finite element analysis of protective bicycle helmet & dummy head under dynamic loading

Cycling is a good activities particularly for recreation, exercise, and transportation. However, cycling related to the head injury is a significant contributor to hospitalization and death. Previous literatures indicates that the available helmets have less effective in preventing head injuries among cyclists. Moreover, most of the available helmets have been tested for only a few loading conditions. Therefore, the purpose of this study is to use finite element models to evaluate the protective effect of a helmet against various impact velocities. The head and helmet model has been developed using computational software. This study focus on the explicit dynamic analysis which performed in ANSY-WORKBENCH with loading condition in term of various impact velocity impacted on front and side of the head model. The results indicates the differences between the frontal and side simulations. They have been compared to identify the protective effect of the helmet and head