Open Access Method Article

Obtaining Pedestrian Interest Regions Using Experimental Methods

Bo Zhang, Denghui Liu

Journal of Engineering Research and Reports, Page 57-66
DOI: 10.9734/jerr/2022/v23i10752

In pedestrian simulation, using the region of interest of pedestrians can solve the problem of data redundancy and complexity and lack of representation in the pedestrian saccade range, and establish an efficient pedestrian collision avoidance behavior model. The real-time eye movement data of unidirectional and bidirectional pedestrian flow were collected by eye tracker, and the mathematical models of pedestrian flow density, radius and angle of each region of interest were established. Analyzing the experimental data, it is found that the range of pedestrian interest region is affected by pedestrian density. The angle of the pedestrian interest region is generally not more than 90°, and the radius of the high-interest region and the low-interest region are negatively correlated with the pedestrian density. When the pedestrian density reaches a certain degree, the radius of the high-interest region and the low-interest region approach the fixed value respectively.

Open Access Original Research Article

Exploring the Underlying Constraints to the Use of Geosynthetics for Civil Engineering Infrastructure: A Study from Ghana

Matthew Kwaw Somiah, Eric Awere, Isaac Yaw Manu

Journal of Engineering Research and Reports, Page 13-23
DOI: 10.9734/jerr/2022/v23i10749

Whereas the level of use of geosynthetics on continental basis is generally considered to be low, little is known of country-specific studies that unravel the constraints to the use of geosynthetics for civil engineering infrastructure in the construction industry. Thus, this study seeks to identify the underlying constraints to the use of geosynthetics for civil engineering infrastructure in Ghana and determine the relative significance of each of the underlying constraints on the use of geosynthetics for civil engineering infrastructure in Ghana. A mixed methodology was employed. A structured questionnaire and structured interview helped in data collection. Data were analysed using frequencies, percentages, mean, standard deviation, one sample t-test, and the Relative Significance Index (RSI). Nineteen (19) underlying constraints were identified as the constraints to the use of geosynthetics in Ghana. Each recorded a significant RSI value from 0.70 to 0.95 and t-test values were statistically significant. The lack of a geosynthetic research institute to champion research-driven campaigns for geosynthetics use in Ghana, and the use of geosynthetics is not prioritized in the manifestos of political parties in Ghana were unique constraints to this Ghana study only. In terms of civil and construction engineering practices, this study has offered an understanding of the constraints to the use of geosynthetics in Ghana and provided the theoretical basis for future geosynthetic-related studies.

Open Access Original Research Article

Evaluation of Activated Carbon from Raphia Palm Nut Endocarp as Adsorbent for Solid Adsorption Refrigeration

Rasheed Bolanle Ayoola, Alex Okibe Edeoja, Jacob Sunday Ibrahim, Aondona Karl Kwaghger

Journal of Engineering Research and Reports, Page 24-47
DOI: 10.9734/jerr/2022/v23i10750

Activated carbon was produced from powdered Raphia palm nut endocarp (REAC) using H3PO4 and CaCl2 as activators before carbonization, and the responses studied to investigate its suitability for solid adsorption refrigeration applications. Temperature, resident time, concentration, and impregnation ratio, were the parameters used and ash content, carbon yield and surface area were the responses. The effect of preparation sequence was evaluated. The efficiency of the activated carbon on the adsorption of methanol was investigated an experimental rig. 100 g of sample was carbonized at 200, 400 and 600oC, and the carbonized samples were used for solid adsorption refrigeration to determine the optimum carbonization temperature. Carbonization times (30, 60, 90, and 120 minutes), activating agent concentrations (25, 50, 75 and 100%) and impregnation ratios (1:1, 1:2, 1:3, and 1:4 precursor to activating agents) at the optimum temperature were used to determine the optimum resident time, concentration and impregnation ratio. The results revealed that H3PO4 activated samples at optimum conditions of 500˚C temperature, 50% concentration, 60 minutes resident time and 4 ml/g impregnation ratio yielded better response with low percentage of ash content (2.25%), high carbon yield (73.63%) and large surface area (2857.51 m2/g) activated carbon were obtained at the optimum conditions. The adsorbing efficiencies of the carbons prepared through activation with H3PO4 achieved 0.084 and 14.5 of Coefficient of Performance (COP) and Specific Cooling Power (SCP) respectively. The results indicated that the carbon is activation before carbonization is well suited solid adsorption refrigeration applications.

Open Access Original Research Article

Design of Automatic Door Lock Based on ATMEGA328P Microcontroller with MLX90614ESF DCI and HC-SR04 Sensors

Pillar Satya Mahardika, Anak Agung Ngurah Gunawan, I. Gde Antha Kasmawan

Journal of Engineering Research and Reports, Page 48-56
DOI: 10.9734/jerr/2022/v23i10751

In conditions like now, it is very important to check a person's health level to be able to enter a room so as not to transmit the disease that exists in that person. Infectious diseases can be avoided by keeping yourself healthy, besides taking care of yourself you can also avoid them by keeping your distance from people who are infected with infectious diseases. The purpose of this study was to keep someone from entering the room due to high body temperature. With MLX90614ESF DCI sensor that can measure temperature without touching and solenoid door lock to lock the door of the person is sick. The suitability of the temperature measurement carried out by this tool has been calibrated with a reference tool and the results of the coefficient of determination analysis are 99.80% of the temperature data obtained.

Open Access Review Article

Review of Magnetic Fluids and their Applications to Vibration Reduction

Xu Haitao, Lu Kuo, Wang Xing

Journal of Engineering Research and Reports, Page 1-12
DOI: 10.9734/jerr/2022/v23i10748

Magnetic liquids are a kind of nano-scale functional material with fluidity and superparamagneticity, which is mainly composed of nano-magnetic particles, base liquids and surfactants. Its characteristics mainly include magnetization, levitation, magnetoviscous effect. Compared with the traditional vibration damper, the vibration damper used in spacecraft based on these features has the peculiarity of small volume, low quality, sensitive to inertial force, and does not rely on spacecraft to provide additional energy. There are successful application cases in foreign aerospace and other fields, while the domestic is limited to some theory and experiment, the practical application is less, the lack of in-depth study. More than half of spacecraft failures are caused by vibration, so it is necessary to reduce the vibration of spacecraft. This paper briefly introduces the composition, preparation and characteristics of magnetic liquids, and reviews the typical applications of magnetic liquids in vibration reduction from the 20th century to the present, including the research on vibration reduction of spacecraft, loudspeakers and workbenches.