EPI International Journal of Engineering

The Impact of Viral Stealth Marketing on Consumers' Buying Interest on Cosmetic Products

2025-01-03T01:56:45+00:00

The concept of viral stealth marketing has been actively used by marketers to make products well received in society. Stealth marketing is one of the digital marketing strategies that advertises a product or service to someone, without them realizing that they are becoming a marketing object. Stealth Marketing is more commonly found on social media platforms today such as Facebook or Instagram compared to traditional advertising media such as newspaper, TV and radio broadcasts. Influencer as a service provider is becoming more general in this method of marketing. Cosmetic products are products that are often marketed with the viral stealth marketing method. Recommendations of cosmetic products from people we know will be easier to accept. Data collection was carried out by conducting a survey on the age group of Gen Z. Data processing using paired t-test and F-test. The results of the paired t-test found that there was a difference in the buying interest of consumers who received product promotion treatment (B1) with the group of consumers who received agent recognition treatment (B2) with a significance value of 0.000. Meanwhile, the results of the F-test show that the presence of agent recognition treatment affects consumers' buying interest in indicators of seeking information, trying products, knowing more, and the desire to own products. This result indicates a change in the buying interest of consumers to cosmetic products when they are aware of the use of viral stealth marketing promotion methods.

Slope Stability Analysis of Pit X on Nickel Mining Based on Comparison between Design and Actual Mining Condition

2025-01-10T08:18:35+00:00

The nickel laterite mining on the slopes of pit X uses the open-cast mining method with material strength conditions similar to soil. Slope stability considerations under temporary conditions such as earthquakes and increased groundwater levels due to rain need to be reviewed as a precaution against landslides. Limonite and saprolite materials have varying cohesion and phi values that affect the safety factor value. The probability function describes the distribution of a random variable to estimate the probability value of a parameter. The limit equilibrium method can indicate the probability of failure. The pit X slope is designed with a bench height of 10 meters, a bench width of 7 meters, and a single slope inclination of 45˚, but after mining, the slope geometry and material distribution conditions change. Stability analysis of the pit X by comparing design and actual conditions after mining is conducted to determine the safety factor comparison under various soil conditions in both design and actual states. The analysis is performed using the Unified Soil Classification System (USCS) classification method and the Morgenstern-Price (MP) limit equilibrium method. All sections meet the slope stability criteria based on the minimum safety factor standards of 1.30 for static conditions, 1.10 for dynamic conditions, 1.0 for saturated soil conditions, and a probability of failure of <5%. However, based on the results of physical property tests, slope stability needs to be reviewed periodically due to the potential for landslides. Sections A-A' and D-D' have steeper overall slopes in the actual condition, resulting in lower safety factors than in the design condition. Sections B-B' and C-C' have gentler overall slopes in the actual condition, resulting in higher safety factors than in the design condition.

Vibration Analysis of Simply Supported Rectangular Plates Constrained by Rotational Edge Springs

2025-01-22T07:03:11+00:00

Comprehensive and accurate numerical results are presented for natural frequencies of thin isotropic, simply supported rectangular plates additionally constrained by rotational elastic springs on the edges. For complete coverage of combination, the number of all the combinations in boundary conditions of simply supported, rotationally constrained and clamped is calculated by Polya counting theory, and all sets of frequency parameters are tabulated for the lowest five modes. The Ritz method, along with displacements assumed in special polynomial form with boundary index, is used to include the strain energy stored in the rotational springs. Convergence and comparison studies are made to demonstrate accuracy of tabulated results, and the frequency parameters are listed for the fifteen sets of boundary conditions and various spring stiffness of the square plates. Some results are also presented for rectangular plates.