Technology Reports of Kansai University (ISSN: 04532198) is a monthly peer-reviewed and open-access international Journal. It was first built in 1959 and officially in 1975 till now by kansai university, japan. The journal covers all sort of engineering topic, mathematics and physics. Technology Reports of Kansai University (TRKU) was closed access journal until 2017. After that TRKU became open access journal. TRKU is a scopus indexed journal and directly run by faculty of engineering, kansai university.
Technology Reports of Kansai University (ISSN: 04532198) is a peer-reviewed journal. The journal covers all sort of engineering topic as well as mathematics and physics. the journal's scopes are
in the following fields but not limited to:
Badak LNG Plant produced Liquefied Natural Gas (LNG) from natural gases. Previously, they produced 1 type of LNG product with calorific value (> 1108 BTU/SCF) or Rich LNG, now they produce Lean LNG products with calorific value (<1108 BTU/SCF). Testing of Rich LNG product is carried out with the standard calibration of Rich LNG gas, which it so far has been successfully carried out with valid measurement data with evidence of comparative testing between LNG terminals. For this new Lean LNG product, the testing has never been done before at Badak LNG, so it is necessary to conduct research on optimization and innovation of gas using for calibration of gas chromatography equipment against the test results. The research stage that will be carried out, it is to verify the performance of agilent GC tool 6890 and 6890N. Then, Lean LNG products are measured using Rich LNG and Lean LNG gas standards. Then, from the results of the two measurements, they were compared with the statistical test method based on the repeatability and reproducibility of the 2261-2020 GPA method to determine whether or not the measurement was accepted by testing. The final stage is to be modeling the determination of gases standard concentration, for the components of methane (CH4), ethane (C2H6) and propane (C3H8). The results of this study indicate, if there is no significant effect in testing the value of standard concentration from Rich LNG gas used for calibration of GC equipment on the results of testing Lean LNG products, the concentration (%-mol) of nitrogen 0.030%, methane 3.978%, ethane 3.182%, propane 1.823%, i-butane 0.449%, n-butane 0.514%, i-pentane 0.020% and n-pentane 0.005%. The validation results of Lean LNG product test results on the Agilent 6890 and 6890N GC referring to the GPA 2261-2020 standard showed that the deviation was still acceptable for testing use. The result of modeling from the standard concentration of LNG for Lean LNG products is obtained by the equation y=ax (value must be included). So, the results of deviation quantity between the sample concentration and the Rich LNG gas standard used for calibration with results that fulfill the requirements for acceptance test.
Jackfruit seed flour (Artocarpus heterophyllus) is a dry product that is hygroscopic. Moisture adsorption by jackfruit seed flour can trigger damage to jackfruit seed flour. This study aims to examine the moisture sorption isotherm in jackfruit seed flour plotted in the Guggenheim Anderson de Boer (GAB) model. The Guggenheim Anderson de Boer model was evaluated to test the model's accuracy using the mean relative deviation (MRD) value. The research was conducted at various adsorption temperatures (25, 30, 35, 40, 45) oC and saturated salts (NaOH, MgCl2, KI, NaCl, KCl, BaCl2) which have different relative humidity (RH) values. The results of the research indicated that the equilibrium moisture content (Me) in jackfruit seed flour increased following the increase in the relative humidity (RH)/water activity (aw) value and the equilibrium moisture content decreased due to the increase in the test temperature. The moisture sorption isotherm curve of the Guggenheim Anderson de Boer model at a test temperature of 35 oC most accurately describes the characteristics of jackfruit seed flour with a mean relative deviation of 3,71. The moisture sorption isotherm curve of the Guggenheim Anderson de Boer model on jackfruit seed flour belongs to type II, which is a sigmoid (letter S).
Jakarta has a long history of mass rail transit (MRT). At present, the MRT in Jakarta is being rejuvenated with the concept of Transit Oriented Development (TOD). Many writers mentioned how businesses could benefit from proximity to a transit station within a TOD. However, the idea of TOD can be considered new to Jakarta. To understand how TOD can be developed to benefit business places, the purpose of the study reported in this paper is to understand the characteristics of business places within a TOD area in Jakarta. One of the common characteristics of a business place related to a TOD is its proximity to a transit station and activity centers near a TOD. There are 18 variables of proximity being examined in this study. By using Factor Analysis, five factors were extracted from those variables. Factor-1 represents walking and bus ride proximity. Factor-2 and Factor-3 are proximity in terms of vehicular routes to/from transit stations from/to a business place. Factor-4 is proximity to urban activity centers, and Factor-5 is proximity to feeder lines and paratransit stops. This study also shows two types of TOD related to the characteristics of business places in Jakarta. One is the compact TOD located in the urban center of Jakarta, and the other is the loose TOD located in the periurban. Further results show road severance that differentiates vehicular route proximity into Factor-2 and Factor-3. There is also an indicator of competition between formal public transportation such as BRT and paratransit, which acts as a feeder line to MRT.
This paper presents a performance analysis of control methods to track the maximum power point (MPP) of photovoltaic (PV) systems for water pumping stations in DJORF TORBA, BECHAR. The tracking takes place under different meteorological conditions. The investigated PV system consists of a solar panel, a DC/DC converter and a buck-boost converter connected to a load. The compared MPPT (Maximum Power Point Tracking) algorithms are the Perturb and Observe (P&O) method, the cascaded PI control, a Mamdani fuzzy logic technique and finally a sliding mode control. The parameters taken into account for the performance evaluation of the MPPT algorithm are the efficiency, the uniform and dynamic behavior of the system under changing conditions such as temperature and irradiation and thus the signal ripple. After comparing these methods and presenting the one with the best results using MATLAB Simulink software for further analysis with different irradiation and temperature conditions. The simulation results are presented and they demonstrate the effectiveness of the sliding mode control method in parameter variation scenarios. The simulation was performed with real data parameters courtesy of the Algerian National Company of Electricity Production (Sonelgaz).
There have been different methods to alleviate the fluctuations in voltage stability or its effects in appliances, one of such ways is the use of stabilizers. This paper expounds the study in the form of comparatively analyzing the two most commonly types of stabilizers in use, the transformer-based which is more common and the transformer-less stabilizers. Herein, the design methodology of the transformer-based and transformer-less stabilizers are shown and the waveforms of the performance stages of the two types of stabilizers are analyzed together with the output for the two cases. Finally, a tabular representation of the results of the comparative analysis is drawn.
