Journal of Technology & Innovation (JTIN)

UTILIZATION OF THE INFLUENCE LINE OF DISPLACEMENT TO IDENTIFY A DECLINE IN THE STIFFNESS OF BEAMS

Tue, 26 Mar 2024 03:23:12 +0700

The purpose of this work is to offer a method for detecting structural damage utilizing the standardized index of the beam's deflection influence line difference as input data for the evaluation procedure. The displacement influence line used in the evaluation is calculated using the findings of the behavior analysis of the reinforced concrete beam's finite element model when subjected to a moving load. SAP2000 software is used to simulate reinforced concrete beams. The mobile load is then assigned to move along the beam from its starting position to its ending position. For each mobile load example, the displacement at each survey node will be output to draw the influence line. The displacement analysis of the beams is compared before and after assuming damage for each mobile load instance in order to determine the location of the stiffness drop. From then, the findings of beam damage diagnosis are reviewed and evaluated, as well as the methods' practicality in real implementations.

IMPROVING THE EFFICIENCY OF BOVINE SOMATIC CELL NUCLEAR TRANSFER PROTOCOL BY ESTABLISHMENT OF CULTURE MEDIUM CHANGING SYSTEM

Tue, 26 Mar 2024 03:34:13 +0700

Bovine cloning is expected as a promising technology for endangered genome conservation and the production of transgenic cloned cows to manufacture human recombinant proteins. However, cloned bovine embryos often resulted in poor development, thus reducing the success of producing cloned offspring. One of the reasons is based on culture medium, which directly relates to the development of cloned bovine embryos. This study aimed to establish culture medium changing system to improve the efficiency of bovine somatic cell nuclear transfer protocol. Our results showed that using the culture medium of Takahashi and First 1992 produced the cloned bovine blastocyst at the highest rate (9.4%, P < 0.05) among different modified synthetic oviduct fluid (mSOF) media. In addition, the rate of embryos developed to the hatching blastocyst was highest in the culture group within transfer embryos to the fresh medium with 5% FBS on day 3 and day 5 (18.5%) compared to the other treatments. Finally, we found that cloned embryos in the group of partial replacement presented significantly higher blastocyst formation rate and quality compared to the group of full replacement (27.6% and 15.6%, respectively, P < 0.05), and it also showed the highest number of cells in blastocyst (about 116 cells). In conclusion, using mSOF and changing the fresh medium supplemented with 5% FBS on day 3 following partial replacement on day 5 improved the preimplantation development of cloned bovine embryos and promoted the blastocyst quality.

AN INVESTIGATION OF A TWO-STAGE ASYMMETRIC DAMPER’ EFFECT ON THE RIDE COMFORT OF AN INNER-CITY BUS BY USING 3-DOFS VEHICLE MODEL SUBJECTED TO RANDOM ROAD PROFILES

Le Dinh Duy — Tue, 26 Mar 2024 03:37:23 +0700

The effect of the asymmetric damper on the vertical acceleration of the driver’s body, suspension deflection and tire dynamic load were studied thoroughly in order to provide suggestions for choosing damping parameters while building a bus’s suspension system. The vehicle model with three DOFs exposed to random road profiles was employed to investigate the dynamic responses for both two cases of linear symmetric and two-stage asymmetric dampers. The investigation was carried out in the time domain by simulation, then the root-mean-square of oscillatory parameters was calculated and examined by using a program made in the MATLAB software. The results of the analysis show that a two-stage asymmetric damper ensures good
oscillatory comfort of the driver but provides less handling stability of the bus when compared to a linear symmetric one

SEISMIC TORSIONAL BEHAVIOR OF A TESTED FULL-SCALE STEEL BUILDING

Tran Tuan Nam — Tue, 26 Mar 2024 03:42:43 +0700

Based on shaking experiment results of a full-scale 4-story steel building conducted on E-Defense – the world largest shaking table in Japan, the characterization of twisting behavior can be achieved. Exploration on twisting motion of the specimen building is presented in this paper, addressing global rotational responses in various increasing excitation levels. Study results show that the torsion movement of the building is mainly due to story mass eccentricity. On the other hand, the shaking-table also causes considerable influence on the building twisting response. System identification and mode superposition of response translational acceleration at floor mass centers are carried out. Some justifications for stiffness of non-structural are also presented, through which we can get a more precise basis to determine stiffness contribution of each component.

OPTIMIZATION OF COMPRESSION IGNITION ENGINE FUELLED WITH COTTON SEED BIODIESEL USING DIGLYME AND INJECTION PRESSURE

J. Nagarajan, Dhinesh Balasubramanian, Esmail Khalife, Kaisan Muhammad Usman — Tue, 26 Mar 2024 03:46:29 +0700

The main research problem from the usage of diesel engine arises from increased fuel prices and emissions releasing from combustion. The objective of the current work relies on finding out a suitable biodiesel blend and improving the diesel engine characteristics by means of additives. The current study discusses about the optimization of the diesel engine characteristics employing cotton seed biodiesel (CSOME) blends. CSOME 20 was found to give the better engine characteristics. Also the engine characteristics were optimized with the addition of diglyme at proportions of 10 and 15% to CSOME20. Along with further optimization was done with varying injection pressure values. It was observed that CSOME DGM 15 reduced the smoke and carbon
monoxide emissions with rise in Nitrogen Oxides. BTE was recorded to be highest at 220 bar. Smoke and hydrocarbon were found to be minimum at 220 bar with maximum NOx emissions.

PROPOSING SOLUTIONS TO REDUCE FACTORS AFFECTING THE DELAY OF CONSTRUCTION PHASE IN HIGH-RISE BUILDING PROJECTS

Tran Tuan Kiet, Truong Cong Thuan, Tran Thi Kha — Tue, 26 Mar 2024 03:48:57 +0700

Along with the rapid development of the construction industry in recent years, high-rise projects have grown in both quantity and scale. However, delays are common in this type of project in developing countries. It causes significant economic damage and has a very serious impact on investor confidence. Following a previous study on factors affecting the delay of construction phase in high-rise building projects, this study will propose solutions to reduce the factors mentioned in the previous study. Nine groups of solutions corresponding to nine groups of factors will be analyzed in this study. The investor chooses a designer and project management consultant who has expertise, experience and is suitable for the project; the investor clearly determined the scale and purpose of using the project; skilled labor and suitable construction methods; provide adequate and timely materials; the investor has to confirm the contractor's capacity are suggested as mitigation activities. The results could help stakeholders learn from the mentioned factors and apply solutions so that they can avoid delays.