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Lecturer play an important role in the process of planning the learning activities, one of them is in the selection of learning model. This research aims to improve the student activities and learning outcomes in the course of chemistry food materials using problem solving learning models integrated with video media. This research was a classroom action research, which consists of 3 cycles. The participants were students of the chemistry education study program who enrol chemistry food materials courses in the odd semester of academic year 2017/2018, totally 35 people. The data analysis technique is by calculating the average value and classical learning completeness. The data were gathered from test in the end of every cycle. It was found that the student's ability in learning process improved after the implementation of Problem Solving model. It could be seen in the improvement of average score for each test, from 78,81 in cycle I, 80,18 in cycle II to 85,69 in cycle III. In addition, classically learning completeness of students also improved, from 82,86 % in cycle I, 88,57 in cycle II to 100 % in cycle III.

Synthesis of polyaniline-polyanethole (PANI-PAN) composite has been successfully carried out by mixing method at room temperature using dichloromethane as solvent. PANI-PAN composites were reacted at 5%, 10%, and 15% polyanethole variations by weight of polyaniline. The synthesis results obtained were structure analyzed by FTIR and characterized by TGA, SEM-EDX, and conductivity. The synthesis of PANI-PAN composites from various variations resulted in the product being a grayish green solid. The success of the PANI-PAN composite synthesis was shown by the results of the FTIR analysis, namely the presence of a typical absorption between polyaniline and polyanethole in the PANI-PAN 5, 10, 15% (w/w) composite, respectively, is indicated by the presence of an amine group (-NH-) at a wavelengths of 3499.94 cm-1, 3457.55 cm-1, and 3506.74 cm-1 for polyaniline and ether groups (C-O-C) at wavelengths 1235.46 cm-1, 1244.14 cm-1, and 1242.21 cm-1 for polyanethole. The morphology of the PANI-PAN composite was performed using SEM-EDX showed the presence of cavity filling in the polyaniline indicated that there had been an even distribution between the polyanethole in the polyaniline. The results of thermal analysis showed an increase in thermal stability compared to polyaniline. The conductivity value of the PANI-PAN composite showed a better value than polyaniline and was optimal at 10 wt% variation.

The machinability of various grades of austempered ductile iron (ADI) has been investigated by using the surface roughness and the resultant chip formation as criteria. Grade 1 ADI, Grade 2 ADI, and Grade 3 ADI were commercially produced, commercially heat treated and machined under controlled conditions using coated carbide inserts with coolant in the laboratory. The milling performance of the various grades was compared to that of AISI 4340, which has a similar hardness to Grade 2 ADI. Grade 100-70-03 ductile iron was used as a reference material in the drilling study. The results of this study show that the surface finish of ADI and the resultant chip formation give quick indications if proper cutting parameters were used during machining of ADI.

The tourism sector has a strong attraction to visitors. The increasing number of visitors encourages the creation of sustainable tourism. Sustainability is strongly related to stakeholders, so it can not be excluded. This study aims to analyze stakeholder roles in environmental management in the tourism sector. This study uses a literature review as the method. This study shows that stakeholders with various roles supported the tourism sector. Visitors are the critical actor in environmental protection, and the community was another actor with support from the government to the tourism business actors. Various stakeholder interests and priorities were not obstacles to the management. To unite the goals and vision, it needs commitment and cooperation to reach environmental protection.

Capsicum frutescens L. is one of the horticultural commodities that plays an important role as food and industrial raw materials. The amount of chili consumption continues to increase, so its production requires quality seeds. The physiological quality of seeds can be improved, one of which is by using fluorescent pseudomonads as biopriming. The fluorescent pseudomonads LAHLS1, LAHT1, LAHCS2, and PfPb3 produced Indole Acetic Acid (IAA) with concentrations between 5.37 to 20.31 ppm, and were significantly different. Biopriming of C. frutescens L. seeds using different fluorescent pseudomonad isolates affected the percentage of germination, wet weight and dry weight of C. frutescens L. seedlings. Fluorescent pseudomonads LAHLS1, LAHT1, LAHCS2, and PfPb3 can increase the percentage of C. frutescens L. seed germination up to 100%. The highest seedling wet weight (43.52 mg) was found in seed biopriming using fluorescent pseudomonad LAHLS1 and the lowest was control (12.33 mg). The highest seedling dry weight (4.40 mg) was found in seed biopriming using fluorescent pseudomonad LAHLS1, and the lowest was control (0.93 mg). The results showed the potential use of IAA-producing fluorescent pseudomonads in increasing the percentage of seed germination and influencing the growth of C. frutescens L. seedlings based on observations of wet weight and dry weight of seeds.

Dengue is a very dangerous disease in the tropic and subtropic areas. This disease is transmitted through the bite of an infected female Aedes Aegypti. In this study, optimal control of the dengue model will be discussed by applying 3 strategies, there are vaccination, repellent, and both of them. A dengue epidemic model was built without control with assumptions given by facts obtained by researchers. Then from the model, the equilibrium point is formulated and the equilibrium point stability of the model is evaluated. The next discussion is to determine the optimal control of the dengue epidemic model and minimize the costs of implementing controls. Numerical simulation results showed that 3rd strategy, which is vaccination and repellent, can reduce the subpopulations number of humans infected by dengue with the minimum cost of implementing control.

Shortly after the rain falls to the surface of the soil, the water flows into the water body or seeps into the ground without being optimally utilized. The low chemical and physical components are the main drawbacks of rainwater utilization. The raw material for fertilizer in this research is rainwater, so we call it rain fertilizer (rainfer). The main components of the additive are Bryophyta, sp, monosodium glutamate, hydrated lime, sodium chloride. They are added to enrich the physical and chemical components. The rainfer reactor is cylindrical with a maximum capacity of 70 liters. As much as 35 litres of rainwater plus additive is put into the reactor and stirred using a pump for 15 minutes until homogeneous. Let the mixture sit for 7 x 24 hours. The results showed that the addition of additives succeeded in increasing the parameters of TDS and conductivity respectively by 98.68% and 99.03%. The concentration of nitrate as nitrogen increased by 96.54%, from 1.13 mg/L to 32.67 mg/L. The final pH was 7.78, total P was 78.47 mg/L, total K was 0.03 mg/L, and heavy metal Cu was 0.06 mg/L. The level of toxicity based on the germination index value was 70.16% compared to the control, which is equivalent to mature and stable compost. The addition of additives can improve the quality of rainwater based on physical, chemical, and non-toxic parameters.

The floods that occurred in Batu in November 2021 were the result of improper management of the upstream area of the Brantas river. This paper reviewing the parties involved in s watershed management strategies with floods. We start by reviewing the watershed management by the stakeholder in upperment areas Brantas. Then we discuss the mitigation strategies’ role in invoicing the negative impact of floods. This research uses qualitative descriptive methods through secondary data collection and literature studies on previous research on management strategies for the upstream area of the Brantas River. This result of the analysis showed that the watershed manages by several leading sectors. The good carrying capacity of the upstream area of the Brantas river is a collaboration of management by the stakeholders. That ability to generate the desired output of basic resources to reduce the risk of several flooding disasters, while maintaining the desired environmental quality. Efforts to develop the regional management can be pursued through community empowerment activities which in practice are carried out through various forms of cooperation/partnerships including community groups. That ability to generate the desired output of basic resources to reduce disaster risk of more severe flooding disasters, while maintaining the environmental quality.

Taro has a starchy root as an energy source due to the complex carbohydrates and a valuable source of essential nutrients. Glucomannan is a potential non-starch polysaccharide found in taro tubers; however, it also contains oxalate, an antinutrient that causes itching. The presented study aimed to investigate the degradation of glucomannan and oxalate in the taro tuber during post-harvest storage. The experiments were conducted in a randomized complete block design with two factors and three replications. The first factor was the source of the taro tuber, consisting of two cultivars from three fields of harvested taro. The second factor was storage duration, namely 2, 4, 6, 8, 10, 14, 12, and 16 days after harvesting. The determined glucomannan content followed the gravimetric method, whereas the spectrophotometric approach was used to analyse the oxalate. The result indicated that the origin of the taro tuber and the storage duration significantly influenced the oxalate content, whereas glucomannan was affected only by the location of the tuber harvested. The contents appeared degraded during 16 days of storage. The glucomannan in the taro tuber slightly declined but was slower than the oxalate reduction.

Salinity stress affects more than 20% of the world’s agricultural area, which causes a decrease in productivity by increasing osmotic pressure, reducing water absorption, diminishing nodulation, and inhibiting soybean seed germination and seedling growth. Using symbiotic microbes is an effective biotechnique for improving salinity resilience in agriculture, especially for seedling development. This study aims to investigate the impact of halotolerant bacteria on plant growth and biochemical parameters of soybeans in saline environment. The experiment involved Devon 1 soybean variety and four endophytic halotolerant bacteria namely B0 (control), B3 (ACC-deaminase production bacteria), B4 (N2-fixing bacteria), and B5 (IAA production bacteria + Phosphate Solubilizing (PS) bacteria + ACC-deaminase production bacteria + N2-fixing bacteria). Hoagland solution was used as the germination medium, and NaCl was added at doses of 0, 40, 80, 120, and 160 mM to create the salinity stress treatment. The results showed that halotolerant bacteria treatment of B3, B4, and B5 enhances the tolerance of Devon 1 soybean seeds to salinity stress and potential as PGP which is found to stimulate plant development and promote the growth of Devon 1 even under high salinity conditions of up to 80 mM.