This study aims to determine the effectiveness of inactivation treatment of silver barb eggs by UV irradiation for 30 seconds (the dose of 991,67 J/m2) or 50 seconds (the dose of 1652,79 J/m2) for damaging the genetic material of silver barb eggs as assessed by abnormal morphology or appearance of the larvae (or haploid), to determine the effectiveness of diploidization by heat shock at 40°C for 90 seconds to silver barb zygote at 10 or 15 minutes from fertilization time, in order to obtain diploid androgenetic of silver barb as assessed by normal morphological larvae (or diploid) similar to the positive control.Results showed that the average fertility among treatments were highly significant difference.

This research was conducted to improve learning outcomes on number sorting material using numerical jersey media in grade II SDN 02 Rowoyoso. This study uses a class action research method that uses II cycles in which each cycle consists of planning, implementing, observing, and reflecting activities. The data collection techniques used are observation, tests, and documentation. The results of classroom action research found that numerical jersey media can improve student learning outcomes. In the first cycle student learning outcomes were 55.55% (10 students who completed) and 44.44% (8 students who were not completed). While in cycle II student learning outcomes increased to 86.66% (13 students who completed) and 27.77% (5 students who have not completed). So it can be concluded that students experience improved learning outcomes and achieve the minimum completeness criteria determined.

This study aimed to determine the stand structure and tree canopy cover in forest and parak ecosystems in Lubuk Kilangan District, Padang City. This is a descriptive research with a direct observation throught purposive random sampling method. Data were collected by making six of 20 x 20 m plots in each primary forest and parak ecosystem. Tree diameters ?10 cm were measured in each plot and canopy cover were collected using the Hemispherical Photography method using a mobile phone front camera equipped with a fish-eye lens. Data were analyzed in terms of stand density, basal area, Stand Basal Area (SBA), and percentage of canopy cover. The average tree density in the primary forest area was 913 individuals/ha, while the tree density in the parak was 467 individuals/ha. The SBA value in the primary forest was higher than in the parak, which was 64.10 m2/ha in the primary forest and 14,72 m2/ha in the parak. The average percentage of canopy cover in both areas shows that the percentage of primary forest canopy cover was greater than that of parak. The average value of the percentage of canopy cover in the forest area was 80.48%, while in the parak area was 71.23%. Correlation between tree density, canopy cover, SBA was only occured in primary forest area where the canopy cover negatively correlated with SBA. This study showed that the primary forest area and parak in Lubuk Kilangan Subdistrict have a good tree density, SBA and tree canopy covers.

This research aims to determine the increase in mathematical problem solving abilities in permutation material through the problem based learning (PBL) learning model. This research is classroom action research (PTK) with research subjects being students of class XI TPM 2 SMK Negeri 1 Madiun, totaling 34 students. In this research, the instruments used were problem-solving ability tests and observation sheets. In this research there are two cycles, where each cycle consists of planning, implementation, observation and reflection which follows the Lewin model procedure. In this study, the minimum learning completeness obtained was >75%. The analysis technique used in this research is descriptive qualitative which is adapted to the Hiles and Huberman technique, including data collection, data reduction, drawing conclusions and verification. The results of this research show that there is an increase in problem solving abilities using the problem based learning (PBL) learning model. This can be seen from the number of students who have achieved the very good problem solving ability category, namely 15.63% in the pre-cycle, then increasing to 25 % in cycle 1, and then increased in cycle 2, namely 53%, and in cycle 2 learning completion had reached 84.38%.
 

The aim of this research is to determine the effect of using comic media on students' reading interest at SD 1 Menawan. This research uses quantitative methods with the research method being Quasi Experiment (quasi experiment). Data collection techniques used in this research include interview guides, comics and questionnaires. The respondents in this study were all students in grades IV and V as the control and experimental classes at SD 1 Menawan. Data analysis techniques were processed and analyzed using SPSS 20 data processing software. The research data obtained was carried out by normality test, hypothesis test, and t-test. The sig value was obtained from the results of the t-test of the two variables of the experimental class and the control class of 0.000 < 0.05, it can be concluded that Ho was rejected, which means that the use of comic media as a teaching material has an effect on the increase in students' interest in reading at SD 1 Menawan.

This research aims to describe the results of exploratory learning about objects in the form of energy concepts on Para Island. The main research activities are exploring objects (Sun, ocean currents, sea waves, and wind), as well as scientific concepts and processes using the Thematic Exploration Learning in Democratic Interaction (HOTL-DI) type A model. Research at Tatoereng State Middle School Classes VII-VIII from June to July 2021. Exploration activities were carried out in three stages. The first stage is material exploration (objects, concepts, and scientific processes), carried out by the research team facilitated by the Pamong Teacher. The second stage is learning activities regarding energy concepts by class VII-VIII students. The results of the phase II assessment are used as a reference for going directly to the field to conduct exploration. Phase III exploration activities for target groups facilitated by mentors and researchers. The research results showed that at the beginning of the activity, all students experienced difficulties, but later, they developed the initiative to carry out their exploration. The exploration results show the development of the concept in the exploration step. Most students experienced improvement in identifying concepts and constructing a comprehensive network of energy concepts.

The part of the basil plant is the leaves which have various types of benefits if studied further. With the introduction of secondary metabolites, it can be said that basil leaves contain eugenol compounds. The eugenol compound can be used as a reducing agent in the synthesis of TiO2 nanoparticles. The precursor used in the synthesis of TiO2 is titanium isopropoxide which has an oxidation state of +4. By utilizing the green synthesis method, TiO2 was reacted with basil leaf extract and then characterized using XRD and FTIR. The resulting particle size is 10.86 nm. And FTIR shows a wave number of 874.59 which represents the Ti-O functional group. Photocatalytic activity can take advantage of the synthesis of TiO2 nanoparticles by placing the nanoparticles in a methylene blue solution which has a concentration of 20 ppm and varies based on contact time and adsorbent mass. Photocatalytic activity testing obtained a degradation percentage of 79%-84% which varied based on adsorbant mass and contact time. Varying the adsorbant mass and time results in a degradation percentage that increases with each additional mass but will not increase again if it has reached the optimum phase and can reduce the degradation percentage.

The purpose of the study was to determine the effect of the bioactivator MOL Jermai Jackfruit (Artocapus integra merr) on the length of time for composting. Jackfruit straw is one of the wastes that has not been used properly and is thrown away so that it can cause environmental pollution. So to avoid this problem, the Jackfruit Straw is fermented into MOL as a compost material from organic vegetable waste, fruits are thrown away and produce a bad smell. MOL Jackfruit Straw was fermented for 7 days with a brown color and smell of alcohol. The research method used experimentally by using 3 variables, namely the independent variable (long composting time), the dependent variable (MOL Straw Jackfruit) and the supporting variables EM4 and control. The results of the research composting using MOL Straw Jackfruit, EM4 and control temperature of the compost 300C, pH 7, 70% content, blackish color, smooth texture and smell like soil. The final composting process in all treatment parameters has met the SNI for compost except the water content, namely the temperature according to ground water (300C), pH 6.80-7.49, maximum water content of 50% blackish color, texture and smell like soil. The length of time for composting using MOL Straw Jackfruit dose of 10 ml 24 days, EM4 10 ml 29 days and control 42 days. Data analysis using the Kruskal-Wallis test obtained a significance value of 0.000 < 0.05, so H1 is accepted or there is an effect of the Jackfruit Straw MOL bioactivator on the length of time for composting.

The Fast Fourier Transform (FFT) method for solving the 1-D heat diffusion equation offers an efficient approach for resolving partial differential equations (PDEs) with various time steps . FFT is used to transform the 1-D heat diffusion equation into the frequency domain and back to the time domain through inverse FFT. Using mathematical modeling with initial and Dirichlet boundary conditions, the numerical solutions produced by FFT are compared with analytical solutions. The accuracy of the method is validated using MAE and MSE calculated in Matlab. At several time intervals , the obtained MAE and MSE values indicate a good agreement between the numerical and analytical solutions, with very small errors. Numerical stability analysis confirms the reliability of the FFT method across various  The variation in time step  has a significant impact on the accuracy and stability of the solution. Smaller time steps improve accuracy and stability but require longer computation times. The optimal time step selected in this study is  Increasing the number of discretization points  also enhances accuracy but implies an increase in computational load and memory usage. The FFT method demonstrates good numerical consistency with increasing
 

The purpose of this study was to determine the significant effect of the Contextual Teaching and Learning model on the learning outcomes of class IV students at SDN Murtajih 1 in the mathematic subject area of flat shapes. This study uses quantitative methods with a Pre-Experimental Design and One Group Pretest-Posttest Design model. The sample was 23 students using the Total Sampling technique. Data collection used test instruments for student cognitive learning outcomes and teacher activity observation sheets. Based on the paired simple t-test, tcount 15.495 > ttable 2.073 shows that Ho is rejected and Ha is accepted or there is a significant effect of the Contextual Teaching and Learning model on the learning outcomes of class IV students at SDN Murtajih 1 in the Mathematic subject area of flat shapes. Based on the N-Gain test, the influence of the effect was 61.52%. The application of the Contextual Teaching And Learning model in mathematics learning about the area of flat shapes in class IV at SDN Murtajih 1 took place over 2 meetings with a duration of 70 minutes for each meeting and was carried out very well with an average implementation percentage of 100%.