Aerogel nanoparticles which originated from organic silica in bagasse ash are unique because the silanol groups present on the silica surface can be replaced with other functional groups according to the application. ...
Aerogel nanoparticles which originated from organic silica in bagasse ash are unique because the silanol groups present on the silica surface can be replaced with other functional groups according to the application. Another uniqueness of the aerogel nanoparticles is the large surface area and pore structure, thus making the aerogel suitable as a sensory material. The combination of the ability to adsorb and the addition of electromagnetic properties can make this material useful as a sensor. In this research, we focused on the optimization of the synthesis of aerogel-based sensors by doping nickel (Ni) nanoparticles to create a highly sensitive and selective sensor material. The synthesis of aerogel nanoparticles was carried out using ambient pressure and alkaline extraction under atmospheric conditions. The aerogel was doped by replacing the silanol group (Si-OH) with Ni. The synthesized Ni-doped aerogel possesses a combination of microporous, mesoporous, and macroporous structures which contributed to its high pore density, pore volume, and surface area. The Ni-doping provides an electromagnetic effect that enhanced the sensory properties on the surface of the aerogel. The findings suggest that the Ni-doped aerogel is a promising material for a sensor application.
This study aimed at investigating productive practicums of various competencies and the competences of Machining engineering department students of Muhammadiyah 1 Bantul Vocational High School. It is a descriptive stu...
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Today, almost everyone has done online shopping activities. The presence of e-commerce makes it easier for humans to do shopping. E-commerce companies compete to provide the best service to the community. One of them ...
Today, almost everyone has done online shopping activities. The presence of e-commerce makes it easier for humans to do shopping. E-commerce companies compete to provide the best service to the community. One of them is in the delivery within the city. In terms of city delivery, the 2E-VRP model has been discussed a lot lately in terms of consolidating shipments. This study aims to present the 2E-VRP mathematical model and work in two stages to find a solution. In this article, the author also compares solutions with several heuristic models including 2-opt, repetitive nearest neighbor, nearest neighbor, farthest insertion, cheapest insertion, arbitrary insertion, and nearest insertion. From the results of research conducted by the 2-opt method, farthest insertion, cheapest insertion, and nearest insertion, the total distance is the best, all three get the same distance, then followed by the nearest insertion, arbitrary insertion, and nearest insertion methods.
Along with the increasing of infrastructure development in Indonesia especially in jepara, so the necessary of material also increase, for example: sand. Nowadays, muntilan is the sand that often be used in making inf...
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Alumunium and low carbon steel are some of many materials that are commonly used in machining process. One of the reasons is that Stainless steel has a high resistance towards rust, followed by a maximum shear strengt...
Alumunium and low carbon steel are some of many materials that are commonly used in machining process. One of the reasons is that Stainless steel has a high resistance towards rust, followed by a maximum shear strength of approximately 124-290 MPa. On the other hand, low carbon steel has a higher shear strength of approximately 500 MPa. In this study, spot welding process on these dissimilar materials is using filler and then analyzed using linear regression analysis, by varying voltage towards the shear strength results based on the parameters used in this research. The research was carried out using an experimental method by processing secondary data. The secondary data was then reprocessed by linear regression analysis using IBM SPSS software, The use of filler in spot welding using Aluminium 6061 and Low Carbon Steel SS400 has a positive effect on the shear tensile strength, resulting in a shear tensile strength of 923MPa with a stress of 3.5 V and a pressing time of 5 seconds.
Since the outbreak of Covid-19 ***, there has been 1.739.750 positive cases and 48.039 deaths. Wearing a facemask is one important aspect to prevent the spread of the Covid-19. WHO recommended three layered cloth mask...
Since the outbreak of Covid-19 ***, there has been 1.739.750 positive cases and 48.039 deaths. Wearing a facemask is one important aspect to prevent the spread of the Covid-19. WHO recommended three layered cloth masks to be worn at home or public place. Based on the initial observation, there were some discomfort felt by customers including headaches, difficulty in breathing and speaking, as well as excessive sweat production on the face that lead to acne, dermatitis, and redness. This discomfort made students not using facemask properly. This study aims to design ergonomic non-medical mask that is comfortable and protective for the customers. Ergonomics Function Deployment (EFD) was applied to redesign the current cloth mask. EFD is the development of QFD (Quality Function Development) by adding a new relationship of customer needs and ergonomics aspects of the product. 376 respondents were surveyed to gather data about satisfaction of currently used mask, customer's needs and their important priority. Data collection of EFD started with preliminary-sampling to identify customer need and customer's level of importance questionnaires distribution to 376 respondents to measure the importance of each attribute of product. EFD showed that most important customer's need of non-medical mask was could protect customers from COVID-19 droplets, had several layers, ergonomically fitted to the customer's face. Four alternatives concepts were generated to fulfill customer requirements, concept A, B, and C selected to be continued. By concept scoring, concept A and B were selected with 4.695 and 4,646. Concept A (it had head loop adjustable design with round stopper; its width and height were 196.4 and 140 mm, it used zipper to open and close mask with width and height of the opening were 67 mm and 77 mm, it had black cloth and elastic string). Concept B (it had ear loop adjustable design with stripped stopper, its width and height were 196.4 and 140 mm, it used zippe
Detecting Bacterial Leaf Blight (BLB) in paddy fields is one of the essential issues in Indonesia to prevent losses in rice production. This study reports the effectiveness of textural analysis using drone-acquired da...
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This paper presents the results of research on fuzzy controller simulation for load control of a 5 kW micro-hydro generator using Simulink Matlab. The model uses two input variables and one fuzzy output variable. The ...
This paper presents the results of research on fuzzy controller simulation for load control of a 5 kW micro-hydro generator using Simulink Matlab. The model uses two input variables and one fuzzy output variable. The controller input variables are consumer power and TRIAC trigger angle while the output is the generator frequency prediction. Based on the simulation results of 41 samples of consumer power used in the simulation, it is found that there are only 4 powerpoints that cause the generator frequency to be outside the specified tolerance limit. Generally, the electric power system in Indonesia uses a frequency of 50 Hz, with a tolerance of±0.4 % or a frequency between 49.8 Hz-50.2 Hz. Overall, it can be said that the performance of the fuzzy controller for controlling the load of the 5 kW micro-hydro generator reviewed in this study has a fairly good performance.
Facing the 4.0 industrial revolution, it is necessary to carry out reforms and innovations related to national education. Reforms and innovations in the implementation of components of the education system involve cha...
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A hydrographic survey can be a cumbersome sometimes. The data can be sparse, providing it can be costly, and it took a lot of manpower and time. Space-borne data like multispectral images can be a helpful tool towards...
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