INTERNATIONAL JOURNAL OF NEW HORIZONS IN THE SCIENCES

ANALYSIS AND PRODUCTION OF SUSPENSION PISTON PRODUCED WITH GLASS FIBER REINFORCED COMPOSITE THERMOPLASTIC POLYMER MATERIAL

2023-12-19T11:18:31+00:00

In the rapidly changing automotive industry, it is of great importance to lighten heavy vehicles, reduce emission values and increase energy efficiency. To achieve these goals, the use of reinforced polyamide materials is becoming increasingly common. These materials stand out for their high strength-to-weight ratio and are preferred in the automotive industry. Polyamides offer an environmentally friendly option as they are recyclable thermoplastic polymer materials. In particular, glass fiber reinforced polyamides provide both durable and light materials. In this study, the suspension piston, which is used to connect the lower axle of the air suspension spring used in heavy commercial vehicles, was produced from glass fiber reinforced thermoplastic composite material instead of traditional cold metal forming.

DESIGN AND PRODUCTION OF APPARATUS FOR THE SOLUTION OF BUCKLING PROBLEM IN THE HEAD CRUSHING PROCESS IN THE ANTI-ROLL BAR PRODUCTION STAGES

2023-12-19T11:17:26+00:00

The automotive industry is constantly developing around the world and in our country, and with this development, quality expectations are also increasing. With the increasing quality expectations, solutions to quality problems are sought. One of the solutions in this context is to improve production processes. The developed production processes make it possible to process the products more precisely, allowing production to be carried out within narrower tolerance ranges. One of the products that requires precise production and is frequently used in automobiles is the anti-roll bar, also called stabilizer, anti-roll bar and balance shaft. The anti-roll bar, also called the stabilizer shaft or lateral control bar, is a critical part of the vehicle suspension system. The anti-roll bar works in coordination with the air suspension bellows to prevent the vehicle from tilting and skidding due to centrifugal force during cornering. In this way, it improves driving safety by increasing the handling ability of the vehicle. In this study, a solution was sought by designing and manufacturing modular apparatus for the buckling problem, which causes the two end heads in the anti-roll bar to be unsymmetrical in the head crushing process.

EVALUATION OF DIFFERENT IMPUTATION METHODS FOR HANDLING MISSING AIR POLLUTION DATA IN BURSA, TURKEY

2023-11-26T09:02:20+00:00

Air pollution data integrity is paramount for effective environmental management and public health protection. This study aims to address the issue of data integrity related to air pollution in Bursa and evaluates various advanced imputation techniques to effectively complete missing data. Five different methods, including linear regression, K-Nearest Neighbors (KNN), decision trees, random forests, and linear interpolation, are compared for filling gaps in the PM_2.5 dataset. Our findings demonstrate that these advanced imputation techniques enhance the completeness and accuracy of air pollution data.

The significance of our study underscores the critical role of accurately and reliably completing missing air pollution data in environmental management and public health. These findings can guide researchers in selecting the most appropriate imputation method for the analysis of air pollution data. Additionally, this study establishes a foundation for addressing the issue of missing data in future research and the formulation of environmental policies.

This study underscores the vital role of imputation methods in ensuring data reliability, contributing to more effective environmental monitoring, and safeguarding public health.

OPTIMIZATION OF CLINOPTILOLITE TYPE ZEOLITE PARTICLE SIZES ON DIFFERENT NLGI GRADE LITHIUM SOAP GREASE FORMULATIONS

2023-12-07T13:27:10+00:00

Particle sizes of zeolites vary according to usage areas and needs. Zeolite ratios for required performance characteristics of lithium soap greases have been optimized in our previous study as 1%. In this study, we have been examined improvement of water resistance characteristic performance with using different size zeolites like: 10 µm, 40 µm, 100 µm and 700 µm. Three different NLGI grades lithium soaps have been used as: 00, 2 and 3. The zeolite size that showed highest water resistance performance was selected. Additionally, we have been reported that zeolites have been deteriorate extreme pressure performance characteristics of greases. Because of this reason we have been also studied with a commercial extreme pressure additive to increase load resistance performances of grease formulations. Appropriate size of zeolites type with optimized ratio used in studied formulations. And performance characteristics like: appearance, penetration, dropping point, NLGI no, wear scar, weld load, water spray and water washout have been reported.

UNDERSTANDING EVOLUTIONARY RELATIONSHIPS AND ANALYSIS METHODS THROUGH MEGA SOFTWARE

2023-12-05T05:55:35+00:00

In recent years, genome sequencing has been a highly effective tool to investigate a wide range of biological systems. Numerous steps for the interpretation of raw sequence data require comparative analysis of molecular sequences for each time period to reveal functional genome differences. Molecular Evolutionary Genetics Analysis (MEGA), a user-friendly software developed to analyse DNA and protein sequence data, provides a set of tools to perform these analyses. MEGA enables a wide range of investigations such as combining sequence alignments, constructing evolutionary trees, estimating genetic distances and variations, and uncovering ancestral sequences. There are some bioinformatics methods to estimate the past knowledge of organisms from their current knowledge. The phylogenetic tree is similar to the evolutionary tree in terms of relationships between biological entities, and the relationships between various species, organisms, genes, etc. in the phylogenetic tree structure are shown by dendograms. Analyses can be performed on nucleic acid, protein, DNA and RNA sequences. There are basically two trees: rooted and unrooted phylogenetic trees. The root is represented by the rooted phylogenetic tree type and is not represented in the unrooted tree, but it can be considered as a root tree because some characters are mapped to the data used. The common ancestor is represented by the root of the phylogenetic tree and the branches of the nodes in the tree represent recent biological information. MEGA software was used to estimate the relationships shown in this figure. In this study, phylogenetic tree construction and evolutionary roots detection and analysis methods were investigated through MEGA 11 software programme on a working file containing data of 10 strains (KC710304.1, KC710305.1, KC710306.1, KC710307.1, KC710308.1, KC710309.1, KC710310.1, KC710311.1, KC710312.1 and KC710313.1) of Thermoplasma acidophilum bacteria obtained from NCBI data bank.

METALLIC FOAMS AND ITS APPLICATION AREAS

2023-12-14T17:38:05+00:00

Engineering materials are generally classified as metals, ceramics, polymers and composite materials. However, today's engineering materials are inadequate in some applications in terms of technical, economic, environmental and aesthetic aspects. The quest to overcome these inadequacies forces researchers to discover new materials with different properties every day. Metallic foams consist of metals or alloys with 75-90% porosity in their structure. Although metallic foams are lighter than other metal materials, they are gaining importance due to their high lightness/strength ratio, ability to absorb impacts and shocks well, high shear and rupture strength, heat and sound insulation, and chemical filtration properties. In this study, existing studies in the literature on metallic foam production methods and production parameters (foaming time, foaming temperature, amount of foaming agent, etc.) were examined and detailed information on the method was given. In addition, comprehensive explanations are given about the application areas of metallic foams in today's industry.