International research journal of engineering, IT & scientific research
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Exergoeconomic and ecological efficiency analysis of steam generation system in ecuadorian tuna industry
Get PDFThe present work was developed, in the steam generation system of a canned tuna canning plant in Ecuador, in which an exergoeconomic and ecological efficiency analysis was applied in combination, with a view to identifying and quantifying the irreversibility’s existing in the process under study, and evaluate the environmental impact produced by the fuel used by this type of facility. The methodology used combined from the literature consulted, the analysis of conventional exergy and exergoeconomic with the ecological efficiency. The results obtained were: the greater destruction of exergy was caused by the steam boiler (with more than 98% of the whole system) for an exergy efficiency of 25.12%; the unit thermoeconomic cost of steam generated by the system is $ 28.07 / Gj; and the ecological efficiency of the steam generator of the industrial plant is 46.27%, with the use of fuel oil 6 as fuel and a thermal efficiency of 84.91%. These results show the need to increase the parameters of steam generation (pressure and temperature), as well as to evaluate the possibility of using other fuel alternatives, to improve the energetic and ecological effects of the tuna plant under study
Renewable energy sources on the change of energy matrix in Manabí province
Get PDFThe exploitation, distribution, and consumption of energy have caused the greatest environmental pollution on the planet and accelerated climate change; even though it has been the promoter of the social, economic development of many generations. Contemporary man can continue to increase his social development, but looking for alternatives to energy development. The work shows a model of energy development that will guarantee the sustainability of social development in the areas of the province of Manabí where energy arrives with low quality and in other places does not exist. The objective of the work is to propose the diversification of the energy matrix from the gradual and progressive introduction of technologies based on the use of renewable resources that it has was distributed in the territory of the province. This result will allow the use of indigenous renewable resources, reduce environmental pollution, and improve the quality of life of populations based on the principle of energy sustainability
Development of interactive mathematics learning media on statistics topic for hearing-impaired student
Get PDFThis research is a development research carried out to answer the problem of scarcity of special mathematics learning resources for hearing-impaired students. Through this research will be developed interactive mathematics learning media which (i) contains material about Statistics in Class VII, (ii) displays abstract mathematical objects in visual form, (iii) displays interesting visualizations according to the characteristics of hearing-impaired students, (iv) equipped with sign language, (v) hierarchically arranged which is ordered where students will be able to move to the next page if they have been able to give the right response/answer, (vi) equipped with evaluation with direct feedback. The research was conducted through four stages, adopting a 4-D development research design (define, design, develop, and disseminate). The quality of the media produced is determined based on expert validation. The results of expert validation indicate that the devices developed have met very valid criteria. In order for the device to meet eligibility criteria, the research needs to be continued so that practical and effective criteria are met through limited and broad trials
Determination of Physical and Mechanical Properties of Quarries Dos Bocas Mouths and Mine Copeto for High Resistance Concretes
Get PDFThe importance of the use, the type and the correct quality of the aggregate (aggregate) cannot be underestimated. Thin and coarse aggregates occupy about 60% to 80% of the volume of the concrete (70% to 85% of the mass) and strongly influence the properties both in the fresh and hardened state, in the proportions of the mixture and the economy of the concrete. Due to the great importance of the quality of the materials that must be used for high strength concretes, this research has been conducted to determine if the aggregates of the Dos Bocas and Copeto quarries meet the requirements outlined in the standards MOP-001 - F- 2002 for high resistance concretes. The bulk material was taken from the Dos Bocas quarry located in Puerto Cayo, Province of Manabí, and the fine aggregate was obtained from the Copeto Mine that is located in the Santo Domingo sector, Santo Domingo de los Tsáchilas Province. The tests executed in the Laboratory of Soil Mechanics, consisted in determining the quality index of the aggregate, calculating the maximum percentage of mass wear, determination of minimum and maximum percentages that pass through the standard sieves, volumetric mass, absorption and surface moisture. For a better understanding and interpretation of the results obtained from the different tests. We proceeded to graphically represent each of them for the two types of aggregates, allowing us to compare the property of each material with its respective specification, as mentioned in the Technical Specifications of the Ministry of Public Works MOP-001 - F- 2002
Problem-based learning and authentic assessment on conceptual understanding and ability to solve mathematical problems: Among students of Politeknik Negeri Bali
Get PDFThis study was aimed at finding out: 1) the difference in concept understanding and ability to solve mathematical problems between the students who were facilitated with problem-based learning model and those facilitated with conventional learning model; 2) the difference in concept understanding and ability to solve mathematical problems between the students who were facilitated with authentic assessment and those who were facilitated with conventional assessment; and 3) the effect of interaction between learning model and assessment model on concept understanding and ability to solve mathematical problems. This study was conducted at Politeknik Negeri Bali by using the 2x2 factorial experimental design. The sample consisted of 110 students. The data was collected using a test which has been validated, proved to have a reliability coefficient of 0.83 for concept comprehension test, and 0.88 for the problem-solving test. Furthermore, the data were analyzed with two-way Manova. The result of analysis showed significantly that: (1) there was a difference in concept understanding on mathematical problem-solving ability between the students facilitated with problem-based learning model and those facilitated with conventional model; (2) there was a difference in concept understanding and problem-solving ability between the students who were facilitated with authentic assessment, and those facilitated with conventional assessment; and (3) there was an effect of interaction between learning model and assessment on conceptual understanding and ability to solve mathematical problems
Meat water content meter using copper electrode sensor based on AT89S52 microcontroller
Get PDFA water measuring instrument meat can be design using a copper electrode. This measuring instrument has a measuring range of 10 % to 85 %. This series of the instrument includes copper electrode sensor, ADC0804 circuit, AT89S52 microcontroller minimum system circuit and 2x16 character LCD circuit. The response line starts from the electrode sensor circuit of the copper converts the water content of the meat into a voltage, then the voltage is forwarded to the ADC0804 which converts the analog signal into voltage into digital data. The digital data obtained is then sent to the AT89S52 microcontroller to be processed into digital data in the form of digit display and letters on 2x16 character LCD. The display of numbers and letters on the 2x16 LCD shows the measured water content of the meat, the design tool utilizes the characteristics of a copper electrode sensor that produces a voltage change proportional to the change in the water content of the detected meat. Compatibility of design tool with the laboratory method obtained from the result of linear regression analysis of test data that is equal to 99,99%
Experimental method to determine the isosteres of adsorbent/adsorption pairs of adsorption cooling systems
Get PDFA qualitative experimental method is presented to determine the amount of adsorbate, which is adsorbed by different adsorbents. It is explained how to determine the isosteres in conditions of saturation, for the levels of temperature and pressure with which usually operates in the systems of cooling by adsorption with the use of solar energy. The method allows obtaining the kg of refrigerant per kg of adsorbent to perform the design of cooling systems of a certain refrigeration capacity, from the mass of refrigerant that is absorbed and desorbed. The accuracy of the method is influenced by the quality of the instruments used in the experiments
Design of zeolite filter for ammonium removal in wastewater
Get PDFThe search for alternative methods that are less expensive and more friendly to the environment is a priority task for the world of science, and simple solutions based on the use of indigenous resources come into play. Natural zeolite is one of the materials that offer the possibility of reducing wastewater pollution, being an abundant mineral in some poor developing nations, hence its use is a cost-friendly and environmentally friendly alternative. In the work, the mineralogical characteristics of the zeolite are analyzed, making it a formidable filtering material of contaminated waters and the existence of deposits of this mineral in the province of Guayas, Ecuador. An environmental characterization of the Portoviejo river is carried out, where the pollution that is occurring is revealed through the existence of more than 300 effluents that discharge the wastewater into the river. The calculations are shown for the design of the zeolite filter that is proposed for the reduction of the contamination of the wastewater that is discharged to the Portoviejo river at the height of the Velazco Ibarra bridge of the city of the same name and a technical scheme of the filtering device based on the use of zeolite
The contribution of psychological maturity and knowledge management in the developing sustainable professional development of productive programme teachers at public senior vocational schools in Bali
Get PDFThis study has aimed the effect of psychological maturity and knowledge management on sustainable professional development of productive teachers of public senior vocational schools in Bali by using expose facto research method involving 162 productive program teachers. The data were collected through questionnaire and portfolio assessment. Data analysis was carried out by using two-predictor regression at 0.05. The results showed that most of the productive teachers tended to have a fairly high level of psychological maturity and a low-level knowledge management in the effort of sustainable professional development. Furthermore, the result of (1) the contribution from of psychological maturity (?1) and knowledge management (?2) to sustainable professional development (?) of 20, 4%, at p ? 0,05 (2) the contribution from of psychological maturity (?1) to sustainable professional development (?) of 17,9%, p ? 0,05 (3) the contribution from of knowledge management (?2) to sustainable professional development (?) of 3%, p ? 0,05. It is recommended to the production program teachers to improve further their sustainable professional development by increasing their knowledge management based on their psychological maturity
Task-based learning and student team achievement division on students motivation and reading achievement: An experimental studies
Get PDFThis study aimed at identifying the effect of Task-Based Learning (TBL) on students’ motivation and reading achievement, the effect of Student Team Achievement Division (STAD) on students’ motivation and reading achievement, and the difference in the effect of Task-Based Learning (TBL) and Student Team Achievement Division (STAD) on students’ motivation and reading achievement. The sample of this research was the grade X students of SMAN 2 Aikmel in academic year 2017/2018. This research used true experimental with pre-test and post-test only designs. Quantitative analysis was done by using two-way ANOVA for hypotheses testing. After analyzing the data, the result of the research showed that TBL was effective to improve the students’ reading achievement and was also effective to increase the students’ motivation. In the same way, when the test was applied to STAD class, the result indicated that STAD also had efficacy to enhance students’ reading achievement and to increase students’ motivation. Furthermore, from the result of the research, it was clear that TBL and STAD had no different results in improving students’ reading achievement and motivation. Thus, from the result of the analysis it could be concluded that there was significant effect of Task-Based Learning (TBL) on students’ motivation and reading achievement; there was significant effect of Student Team Achievement Division (STAD) on students’ motivation and reading achievement; and there was no any significant difference in the effect of Task-Based Learning (TBL) and Student Team Achievement Division (STAD) on students’ motivation and reading achievement