Title: |
The Design of Experiment : An Optimization of Mortar Mixture Composition with Silica Fume As Partial Replacement For Cement
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Authors: |
Gagassage Nanaluih De Side, Ni Nyoman Kencanawati, Hariyadi |
Source: |
International Journal of Latest Engineering Research and Applications, pp 01 - 05, Vol 04 - No. 04, 2019 |
Abstract: |
In an effort to produce better mortar quality, a quality control method is required. The purpose of this research was to determine the proportion of the material with the optimum partial replacement of cement by silica fume to the compressive strength of the 56-days mortar, where the focus of quality control shifted to the earlier stage of product design stage. The further research is needed to determine the actual optimum proportion. This research uses 3 factors, which are the proportion of silica fume, the proportion of sand, and the proportion of cement, for each factor consists of 3 levels, with the content of silica fume is ±20% from weight of cement. Mortar is based on 9 combinations of materials on the orthogonal matrix L9(34) then created with dimensions 50 mm3 cube. The results show that the optimum proportion is 150 gr of silica fume, 660 gr of cement and 1400 gr of sand which is equivalent to replacing 22,7% cement with silica fume, which gain 54,00 MPa compressive strength. |
Keywords: |
compressive strength, mixture composition, mortar, optimization, silica fume |
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Title: |
Internet of Things Security Management Policies and Procedures
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Authors: |
Dr. Abdelrahman Karrer, Mohammed Saif |
Source: |
International Journal of Latest Engineering Research and Applications, pp 06 - 10, Vol 04 - No. 04, 2019 |
Abstract: |
Internet of thing is an advanced concept in information technology that benefit the society thorough providing solutions for several kinds of problems. Internet of thing (IOT) require strong security system and securities management policies. Considering the importance of security systems, policies and procedures for IOT security management are discussed in detail. In this paper, major components, challenges, and applications of IOT are discussed in the light of information and knowledge collected from research and literature review. Secondary data analysis presented information about the key threats of IOT and FTC policies for security management that is also presented in this paper. After discussing the all challenges and applications of IOT recommendations are presented for security system of IOT. In the light of research, it can be recommended that experts of IOT should follow up the guidelines and policies to avoid security related issues. |
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Title: |
Comparison of Rules for Reservoir Operation Patterns Based on Needs, Based on Storage (Genetic Algorithms) for Tanju Reservoir Optimization
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Authors: |
M. Gery Prakarsa Pranatagama. W, Atas Pracoyo, Sasmito Soekarno |
Source: |
International Journal of Latest Engineering Research and Applications, pp 11 - 26, Vol 04 - No. 04, 2019 |
Abstract: |
The drought (water crisis) in several reservoirs that have been built, arises due to the ineffectiveness of the reservoir operation pattern and the need for water is not linear (linear) with the water availability (inflow). There are several rules that are used as the basis of reservoir operation patterns, namely the rules of operation based on needs and based on storage, limitations in existing operating patterns (needs), generally occur in cases of reservoirs that have no large water availability and fluctuating characteristics of the inflow, consequently the reservoirs frequently go through emptiness and decreased needs, as an example of a reservoir that needs to be optimized is the Tanju Reservoir in Dompu District. The formulation of the problem in this study is to conduct simulation and compare the results of the pattern of reservoir operations with rules based on needs, based on storage and optimization of genetic algorithms. The purpose and benefits of making simulations and comparing the best value of reservoir operation patterns with certain rules with certain inflow conditions is to provide alternative release guidelines so that the fulfillment of Tanju Reservoir needs is more optimal. The method applied in the reservoir operation pattern is the rules based on needs, based on storage and based on optimized storage with genetic algorithms for inflow conditions of wet discharge (Q20), normal discharge (Q50) and dry discharge (Q80). From the calculation of the best value for wet discharge conditions (Q20) is a rule based on needs, normal discharge (Q50), is a rule based on needs and dry discharge (Q80) is a rule based on the storage optimized with genetic algorithms. |
Keywords: |
drought reservoir, Simulation of Reservoir Operation Pattern, Rules based on Needs, Rules based on Storage, Optimization of Genetic Algorithms. |
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Title: |
Hydrolyzing-Extracting and Determining structure of the pigment R-phycoerythrinfrom Mastocarpus stellatus
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Authors: |
Huu Phuoc Trang NGUYEN, Thi Tra My PHAM |
Source: |
International Journal of Latest Engineering Research and Applications, pp 27 - 33, Vol 04 - No. 04, 2019 |
Abstract: |
This study reports the hydrolysis and extraction of R-Phycoerythrin (R-PE) from red algae Mastocarpus stellatus. R-PE is a phycobiliprotein which is used for natural colorant in the food and cosmetic industries. For freeze-dried algae, acetate buffer 50mM, pH 6 presented better results for R-PE extraction following hydrolysis by enzyme xylanase. The R-PE yield was 1.94 mg. g-1dw and the Purity Index (PI) was 0.25. ThenR-PE purificationwas performed by DEAE sepharose Fast Flow chromatography with a three-step increase in ionic strength. The crude extract was separated into three fractions: AE-150, AE-200 and AE-1000.By SDS-PAGE the AE-200 fraction was determined (αβ)6γγ’ for R-phycoerythrin from Mastocarpusstellatus. |
Keywords: |
Mastocarpus stellatus, Purification, SDS-PAGE, R-phycoerythrin, xylanase. |
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Title: |
Image based fractal characterization and modeling of multiphase flow in sandstone formation
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Authors: |
Usman, A.H., Zhou, Y. |
Source: |
International Journal of Latest Engineering Research and Applications, pp 34 - 45, Vol 04 - No. 04, 2019 |
Abstract: |
Fractal-based approach has been reported to be very promising in the study of fluid transport in porous media. It has been discovered that, by treating the pores in sandstone formation as a set of fractals, a significant information regarding the mechanisms of multiphase flow in porous media can be unveiled. Consequently, a great attention has recently been focused on the use of fractal theory to develop analytical models for flow parameters in porous media. Hence, in this work, a similar concept of fractal theory was employed to characterize the pore spaces in a 2-dimensional image of Bentheimersandstone. Based on the analysis, the apertures were found to be fractals in nature with pore area and tortuosity fractal dimensions of 1.58 and 1.14 respectively. Also, fractal-based analytical functions have been derived for capillary pressure and relative permeability. The formulated flow functions have shown that the capillary pressure and permeability in a given fractal porous media depend not only on saturation, but also on several other parameters such as wettability, minimum and maximum pore size as well as fractal dimensions. Moreover, a permeability model that incorporates film/layer thickness has been proposed and validated using existing experimental data of the Bentheimer sandstone and theresults were found to be consistent with both experimental and numerical figures especially for the nonwetting phase. |
Keywords: |
Capillary pressure, fractal, multiphase flow, porous media, relative permeability. |
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Title: |
Case Study on the Tide of Obsolescence of Toy Stores: Evidence from the Philippines
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Authors: |
Dr. Dennis A. Sandoval, IVPF, DBE, CPA |
Source: |
International Journal of Latest Engineering Research and Applications, pp 46 - 48, Vol 04 - No. 04, 2019 |
Abstract: |
The age of technology has put traditions at the back seat, and this also includes old-school games and toys. When children exposed early to gadgets start preferring them over toys, toy retailers such as F Company are at a risk. Even before this local toy store start facing bankruptcy issues like the A Company in the United States of America, the management should already consider improving and upgrading their physical stores to maintain the market. The declining demand for toys should be addressed immediately while the damage is still small and easily repairable. With that being said, marketing strategies are what will salvage the future of F Company.
Because this is the age of technology, the best way to ride with the waves is by also incorporating technology into their stores. A major renovation and reorganization of F Company will greatly improve the overall impact it has on customers across age groups. Their curiosities will lead them to the toy stores, but the interactivity they will find will bring them back to the desire to actually play with the toys instead of finding joy in just staring at their screens playing or watching. However, this improvement may require a big investment, but its returns will be bigger and the stability and survival of F Company in the market is at a higher level than it currently is at now. |
Keywords: |
Gadgets, interactivity, survival, technology |
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Title: |
Research on Thermal Properties of a Phase Change Regenerator based on parallel-flow heat exchanger
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Authors: |
Jiahua Xu, ZhenhuiHe, Guangzhou Dang |
Source: |
International Journal of Latest Engineering Research and Applications, pp 49 - 55, Vol 04 - No. 04, 2019 |
Abstract: |
Phase change energy storage materials (PCM) provide an ideal solution for thermal control requirements in complex thermal environments such as deep space exploration. PCM can also provide high cooling power in a short period of time with limited power supply. In microgravity, solid or shape-stable PCM can provide high thermal conductivity without the need for fluid management. It is of great significance to understand the heat transfer process between PCM and PCM HX for the design and optimization of PCR.Based on the above requirements, the phase change regenerator (PCR) made by ourselves based on flat tube heat exchanger was studied experimentally. R134a is used as working medium to build a closed loop. The phase change regenerator stores the cold energy into the PCM through the Thermo Electric Cooler (TEC), and then takes the cold energy out through the liquid phase and two-phase R134a. The heat transfer performance is good, the liquid working medium under the thermal state heat transfer capacity of about 6.0W / ℃.Through the analysis of the experimental results under different working conditions, the cold storage and release performance of the phase change regenerator are understood. This paper also discusses the influence of different mass flow rate and quality on the performance of the regenerator. With the increase of mass flow rate and quality, the heat transfer capacity is improved, but the utilization rate of cooling capacity is decreased. |
Keywords: |
PCM, flat-tube HX, PCR, two-phase flow |
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