ERJ Open Research receives its first impact factor and plans for the next step

Impacts can be classified in various forms, primarily under two subgroups: central impact and oblique impact. A central impact occurs when two objects collide head-on, possessing opposite velocities aligned along the line of impact. Conversely, an oblique impact occurs when two objects collide at an angle, resulting in a modification of both direction and velocity.
The coefficient of restitution is a metric for understanding the dynamics of impacts. It quantifies the ratio of relative velocity...

Subject: Physical ScienceChapter: Resources, Energy, and SocietyNGSS Alignment: MS-PS1-3Lesson Title: Environmental Impact of Resource UseThe extraction, processing, and use of natural resources affect the environment in many ways. Resources such as water, fossil fuels, minerals, and forests are essential for human activities, but their overuse can lead to pollution, habitat destruction, and climate change. Scientists and engineers work to develop sustainable solutions that balance resource use...

Environmental Impacts of Nonrenewable ResourcesNonrenewable resources such as coal, oil, natural gas, and nuclear energy play a major role in global energy production and have significant environmental consequences. Extracting, processing, and burning these resources release pollutants, greenhouse gases, and waste products, affecting air, water, and ecosystems. Comprehending these effects is crucial for the creation of more environmentally friendly energy alternatives.Major Environmental...

Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...

Impact strength in concrete is a critical measure that reflects the material's capability to endure the forces applied during pile driving and when supporting machinery foundations that experience impulsive loads. It is also essential when handling precast concrete components to prevent accidental damage. The impact strength is assessed by observing the concrete's resistance to repeated impacts and energy absorption capacity. A key indicator of significant damage to concrete is when it...

The workability of concrete is a critical characteristic that influences the ease of mixing, handling, and finishing the concrete. It is affected by several factors including water content, aggregate properties, and admixtures like air entrainment. Water plays a fundamental role as it lubricates the concrete mix, facilitating easier movement and placement. However, the water requirement varies depending on the texture and shape of aggregates. Finer particles and angular, rough-textured...