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:
Pakchoi is a vegetable grown and used widely in Vietnam and Southeast Asian countries. This vegetable has long been widely known for its ability to accumulate metals from soil, water, ... and these metals themselves can play a significant role in identifying the geographical area of Pakchoi. Applying this characteristic, the content of 27 metals in irrigation water at a total of 9 Pakchoi growing locations regularly serving the Hanoi market from September 2022 to May 2024 was analyzed using ICP-MS. The analytical results were used to build a model to distinguish the geographical location of Pakchoi growing areas. Among the analyzed metals, Mg, Ti, V, Mn, Rb, Mo, As, Cd, Ba, and Pb were shown to be the metals that play an important role in identifying Pakchoi growing areas in Hanoi. The obtained model gave good discrimination results of up to 100% and completely identified the prepared samples for prediction. The results of this study provide a model to help determine the geographical origin of Pakchoi through the metal composition of irrigation water and, at the same time, contribute as a reference for determining the origin of other vegetable crops in the food market.
Essential oils are primarily used for their aromatic and flavoring properties, while oleoresins are valued for their pungent, spicy, and antioxidant properties. Separating these components allows for their targeted use in various industries, such as food, pharmaceutical, and cosmetic applications. Sequential extraction helps maximize the yield of each component by using the most suitable extraction techniques for each. In Vietnam, ginger from Lang Son province (Zingiber officinale Roscoe) exhibits balanced composition for essential oil extraction, (Moisture: 81.90%, essential oil: 3.83% dw. and starch: 74.09% dw.) This research aimed to explore the sequential extraction of essential oil and oleoresin from ginger harvested in Lang Son, Vietnam, employing steam distillation followed by ethanol extraction, with solvent/material ratio and extraction duration assessed. Essential oils and oleoresins have different functional properties and applications. The chemical components were Gas Chromatography-Mass Spectrometry (GC/MS) analyzed, while 6-gingerol content was quantified using High-Performance Liquid Chromatography (HPLC). Optimal conditions were defined at 4:1 water/material ratio, distillation for 240 minutes, extraction at a 30:1 ethanol-to-material ratio for 21 hours. The essential oil recovery efficiency was 89.95%, characterized by a yellow hue, intense aroma, and a pungent flavor dominated by monoterpene and sesquiterpene compounds. The oleoresin contained 8.13% of 6-gingerol, which converts to 6-shogaol upon exposure to elevated temperatures.
The geological age of the outcrop along the Prataan River were interpreted based on calcareous Nannofossil and Foraminiferal assemblages. The lithological unit recognized in this area, from oldest to youngest are Ngrayong-Bulu, Wonocolo, Ledok and Mundu Formations. In this study, 23 samples of 15 sample locality were analyzed; 23 species of calcareous Nannofossils and 20 species of planktic Foraminifera were identified. Based on calcareous Nannofossil, the Ngrayong-Bulu, Wonocolo, Ledok-Mundu Formations are NN7 or middle Miocene, NN10 or late Miocene, NN14-NN15 or early Pliocene in age, respectively. Based on planktic Foraminifera, the Wonocolo is N16 or late Miocene, and Ledok-Mundu Formations is N18-N19 or Pliocene in age. Correlating the section's composite column of Prataan River with well TPN-1, revealing that the middle-late Miocene unconformity and the late Miocene-early Pliocene unconformity discovered in the well are predicted to be existed in the Prataan River outcrops.
This investigation characterizes the fracture behavior of a dissimilar weldment comprising E2209 duplex stainless steel as a weld metal and the low alloy steel 20MnMoNi55 as a base metal. The microstructure of the base metal consisted of bainitic structure while the weld metal comprised ferrite and austenite phases. Instrumented impact testing was employed to determine the fracture behavior at temperatures between -196 and 300 C. The results showed that the base metal and the duplex weldment exhibited distinct ductile to brittle fracture transition behavior. The base metal displayed much higher upper shelf energy (USE) level than that of the duplex weldment (130 vs. 80 Joule), designating superior resistance to ductile fracture at high test temperatures. By contrast, the duplex weldment exhibited a greater deal of resistance to brittle fracture at low test temperatures. That was manifested by a lower value of the ductile to brittle transition temperature (DBTT) of the duplex weldment against that of the base metal (-75 vs. 25 C). In addition, the brittleness temperature (the temperature at which complete brittle fracture features prevail) was much less for the duplex weldment than the base metal (-100 vs. -25 C). Furthermore, the cleavage fracture stress as computed from the dynamic yield strength values determined at the brittleness temperature gave values of 2650 and 1890MPa for the duplex weldment and the base metal, respectively. The results were substantiated by the load–time traces, derived from the instrumented impact tests at different temperatures as well as the pertinent fracture surface morphologies.
The pressure vessel steel A533-B used in the nuclear power reactors was heat treated to simulate thermal circumstances similar to those that could develop during a loss of coolant incident. The applied heat treatment resulted in phase transformation of the steel from tempered bainite structure into untempered lath martensite structure. The impact properties of the steel in the as-received condition and after heat treatment were evaluated. The results showed that the as- received steel has experienced serious degradation in the impact properties after exposure to heat treatment. The ductile to brittle transition temperature increased by 100oC and the upper-shelf energy was lowered by 30%. Room temperature impact test results showed 100% ductile fracture behavior of the steel with a total fracture energy of 200 J. After heat treatment, the steel displayed 100 % brittle fracture behavior with a total fracture energy of 12 J. Load-time curves of the instrumented impact tests showed that the decrease in the impact fracture energy was mainly due to the decrease in the fracture propagation energy than in the fracture initiation energy. Fracture surface morphology of specimens tested at room temperature revealed ductile microvoid coalescence fracture features for the as-received steel and brittle cleavage fracture features for the steel after exposure to heat treatment. The resulted embrittlement of the steel was discussed in relation to the phase transformation of the steel microstructure in consequence of the applied heat treatment.
