Indonesia has enormous geothermal potential, but it only contributes 5% to Indonesia's energy matrix. During 37 years of operation, PT. Pertamina Geothermal Energy Kamojang area has been operating to produce elect...
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Strawberry production is an important crop in the northern region of Thailand that is only available in winter. Theoretically, strawberries can be grown in plant factories that can control the climate conditions straw...
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ISBN:
(数字)9798331517076
ISBN:
(纸本)9798331517083
Strawberry production is an important crop in the northern region of Thailand that is only available in winter. Theoretically, strawberries can be grown in plant factories that can control the climate conditions strawberries need. Generally, the cooling load from lighting accounts for almost 80% of the total heat load in the plant factory. To reduce the cost of using light energy and the heat load in plant factories, this study was conducted on cultivation methods in semi-closed greenhouses that utilize natural light during the day. Coolness is generated by solar energy during the day and stored in cooling energy storage that stored coolness is used during the night. The total cooling load for year-round strawberry cultivation in the greenhouse was about 814 GJ, consisting of the stages of strawberry floral initiation, flowering, and fruiting at 17%, 17%, and 66%, respectively. In addition, the payback period is around 14.16 - 16.29 years.
Structural Health Monitoring (SHM) system can be considered as an Internet-of-Things (IoT) system implemented to engineering structure to provide real-time information on the integrity of the structure. In doing so, t...
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Rapid development in vehicular technology has caused more automated vehicle control to increase on the roads. Studies showed that driving in mixed traffic with an autonomous vehicle (AV) had a negative impact on the t...
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Repairs of through-wall corrosion damage in pipes conveying liquids using bonded metallic patches are becoming more and more common in the oil and gas industry. Usually, this kind of patch is used in association with ...
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Repairs of through-wall corrosion damage in pipes conveying liquids using bonded metallic patches are becoming more and more common in the oil and gas industry. Usually, this kind of patch is used in association with a composite sleeve, and it is essential to assure that the repair wońt leak. The standards for the design of composite repair systems (such as ASME PCC-2 and ISO 24817) dońt forbid the use of bonded metallic patches associated with the composite sleeve, however they do not address this very frequent practice adopted in industry. Since the patch is responsible for sustaining most of the pressure of the repair, it becomes necessary to further understand its behaviour. This paper presents investigates the cyclic inelastic behaviour of a metal patch/adhesive system and of its effect on the failure pressure. Hydrostatic tests were performed regarding how pressure variations can generate cyclic inelastic strains in the adhesive layer that bonds the metal patch to the pipe, and how this loading-unloading process ultimately affects the failure pressure. The failure pressure in monotonic burst tests can be reasonably modelled using basic concepts of linear elastic fracture mechanics. Although the assumption of a brittle-elastic behaviour for the repair system seems adequate in the case of monotonic loading, it is not in the case of cyclic tests with high pressure amplitudes. The repairs of steel pipes under pressure with a 25 millimetres diameter hole failed after a very small number of cycles with pressure amplitude of 80% of the average failure pressure obtained in monotonic burst tests. To help understanding the behaviour of the system, single lap joints were also studied. The metal adherends are not subjected to significant permanent deformations, while de adhesive layer has an inelastic behaviour. Results show that the lap joints present a rate-dependent behaviour and may present highly different cyclic responses which are quite sensitive to very small pert
Niobium-doped tin oxide (NTO) particles with a macroporous structure have been developed as catalyst supports for enhancing the durability and performance of polymer electrolyte fuel cells (PEFCs). This macroporous ar...
This study aims to determine the influence of industrial work practice and workshop facilities on work readiness in class XI mechanicalengineering. The research subjects were 101 students of class XI mechanical engin...
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This study aimed to examine the factors influencing the acceptance of eLearning platforms in medical education during the COVID-19 pandemic in the Philippines, using the latent variables from the Unified Theory of Acc...
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ISBN:
(数字)9798350386097
ISBN:
(纸本)9798350386103
This study aimed to examine the factors influencing the acceptance of eLearning platforms in medical education during the COVID-19 pandemic in the Philippines, using the latent variables from the Unified Theory of Acceptance and Use of Technology 2 (UTAUT2) and two additional variables derived from relevant literature. A total of $\mathbf{3 6 0}$ medical students participated by completing an online survey comprising 40 questions. The analysis, conducted using stepwise multiple linear regression, revealed that Performance Expectancy (PE), Habit (HB), and Instructor Characteristics (IC) were significant predictors of Actual Use (AU) with an accuracy of 54.22%. Higher levels of PE, HB, and IC were found to positively influence the acceptance and utilization of medical eLearning platforms. The findings from this study can provide valuable insights for the Commission on Higher Education in the Philippines, aiding in the enhancement of eLearning platforms for medical education. Although this research primarily focused on UTAUT2 and two additional variables-Learning Value and Instructor Characteristicsthe results offer substantial implications for the broader development f eLearning platforms in the medical field.
In this paper, we compare two measurement techniques to analyze the dynamic response of a MEMS resonator, made of a microcantilever beam, that is electrostatically actuated via a side electrode. The first method is ba...
In this paper, we compare two measurement techniques to analyze the dynamic response of a MEMS resonator, made of a microcantilever beam, that is electrostatically actuated via a side electrode. The first method is based on a combination of Michelson interferometry, knife-edge analysis, and stroboscopic imaging, and is used to dissect the in-plane and out-of-plane motions of the resonator. The second approach follows the motion-induced current method and is based on a transduction mechanism that converts the movement of the resonator to a current signal. The third harmonic of said current is directly related to the in-plane motion of the resonator. Motion-induced current measurements enable the detection of the nonlinear dynamics associated with the motion of the resonator when actuated with high excitation voltages. The optical and electrical measurements show similar nonlinear features in terms of the location of the cyclic-fold bifurcation in the parameter space and the hysteretic region associated with it. These dynamic features can be exploited for sensing purposes.
Operator learning, which aims to approximate maps between infinite-dimensional function spaces, is an important area in scientific machine learning with applications across various physical domains. Here we introduce ...
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