Sidewall Adhesion Evolution in Epitaxial Polysilicon as a Function of Impact Kinetic Energy and Stopper Area

2016 ◽  
Vol 25 (1) ◽  
pp. 134-143 ◽  
Author(s):  
S. Dellea ◽  
R. Ardito ◽  
B. De Masi ◽  
A. Tocchio ◽  
F. Rizzini ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Impact Kinetic Energy

scholarly journals Particle Impact and Breakup in Aircraft Measurement

2009 ◽  
Vol 26 (5) ◽  
pp. 972-983 ◽  
Author(s):  
German Vidaurre ◽  
John Hallett
Keyword(s):  
Kinetic Energy ◽  
Surface Energy ◽  
Cloud Particle ◽  
Aircraft Measurement ◽  
University Of North Dakota ◽  
Particle Properties ◽  
Imaging Probes ◽  
Impact Kinetic Energy ◽  
The Impact ◽  
Particle Approach

Abstract Measurements of cloud particle properties from aircraft by optical and impact techniques are subject to artifacts following particle breakup prior to detection. The impact kinetic energy to surface energy ratio (ℒ) provides a breakup criterion at ℒ ≥ 7 for water and ice with major fragmentation for ℒ > 100. This applies to optical imaging probes for particle concentration, size, and projected area spectra measurement. Uncertainty arises should impacting particles shatter and disperse, defeating the intent of the original measurements. Particle shatter is demonstrated in Formvar replicas (University of North Dakota Citation) and video records of particle approach and impact on the Cloudscope (NCAR C-130, NASA DC-8) at airspeeds of 130 and 200 m s−1. Sufficient impact kinetic energy results in drop splash and ice shatter, with conversion to surface energy and ultimately thermal energy through viscous dissipation and ice defect production occurring down to the molecular scale. The problem is minimized in design by reducing the regions responsible for particle breakup to a minimum and locating sensors in regions inaccessible to shatter fragments.

scholarly journals Impact of a Multiple Pendulum with a Non-Linear Contact Force

Mathematics ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 1202
Author(s):  
Dan B. Marghitu ◽  
Jing Zhao
Keyword(s):  
Kinetic Energy ◽  
Contact Force ◽  
Equations Of Motion ◽  
Linear Equations ◽  
Kinematic Chain ◽  
Double Pendulum ◽  
Lagrange Equations ◽  
Non Linear ◽  
Impact Kinetic Energy ◽  
The Impact

This article presents a method to solve the impact of a kinematic chain in terms of a non-linear contact force. The nonlinear contact force has different expressions for elastic compression, elasto-plastic compression, and elastic restitution. Lagrange equations of motion are used to obtain the non-linear equations of motion with friction for the collision period. The kinetic energy during the impact is compared with the pre-impact kinetic energy. During the impact of a double pendulum the kinetic energy of the non-impacting link is increasing and the total kinetic energy of the impacting link is decreasing.

scholarly journals The Influence of Sinusoidal Oscillating Water Flow on Sprinkler and Impact Kinetic Energy Intensities of Laterally-Moving Sprinkler Irrigation Systems

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1325 ◽  
Author(s):  
Kai Zhang ◽  
Bo Song ◽  
Delan Zhu
Keyword(s):  
Kinetic Energy ◽  
Water Flow ◽  
Energy Intensity ◽  
Irrigation System ◽  
Water Pressure ◽  
Sprinkler Irrigation ◽  
Low Pressure ◽  
Irrigation Systems ◽  
Impact Kinetic Energy ◽  
Nozzle Spacing

Laterally-moving sprinkler irrigation systems under low pressure experience problems including small spraying range, low uniformity, surface runoff, and low water utilization rate. To solve these problems, experiments were carried out on a laterally-moving sprinkler irrigation system using a Nelson D3000 sprinkler (Nelson Irrigation Co., Walla Walla, WA, USA) under low pressure, sinusoidal oscillating water flow. The sprinkler intensity and impact kinetic energy intensity distribution were investigated for sprinklers both static and in motion. The test data were used to calculate combined sprinkler intensity and impact kinetic energy intensity uniformity for different nozzle spacings, and were compared with constant water pressure test results. It was found that sinusoidal oscillating water flow can effectively increase spraying range, as well as reducing the peak value of the sprinkler intensity and impact kinetic energy intensity. Within an optimal range of amplitude and nozzle spacing, sinusoidal oscillating water flow significantly improves the combined sprinkler intensity, impact kinetic energy intensity uniformity, and the spraying quality of laterally-moving sprinkler irrigation systems under low pressure conditions. When the average water pressure is 100 kPa, the optimal range of amplitude of sinusoidal oscillating flow applied to the laterally-moving sprinkler irrigation system is 50–60 kPa. When the amplitude is 50 kPa, the optimal nozzle spacing is 3.5–4 m; when the amplitude is 60 kPa, the optimal nozzle spacing is 3.5–4.5 m. The related parameters can provide a reference for the application of sinusoidal oscillating water flow in laterally-moving sprinkler irrigation systems.

Penetration Fracture Characteristics of CFRP Curved Laminates

2005 ◽  
Vol 297-300 ◽  
pp. 183-188
Author(s):  
Young Nam Kim ◽  
Young Jea Cho ◽  
Kil Sung Lee ◽  
Kwang Hee Im ◽  
Koung Suk Kim ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
High Strength ◽  
Space Vehicles ◽  
Absorbed Energy ◽  
Laminated Shells ◽  
Fracture Characteristics ◽  
Before And After ◽  
Cfrp Composite ◽  
Strength And Stiffness ◽  
Impact Kinetic Energy

CFRP composite materials widely used as structural materials for airplanes, ships and aero space vehicles because of their high strength and stiffness. This study aims to investigate the effects of curvature and stacking sequence on the penetration characteristics of CFRP laminated shell. They are stacked to [02/902]S, [03/903]S and [02/903/0]S, [0/902/0]S, and their interlaminar numbers are two and four. We are manufactured to composite laminated shells with curvature radii of 100, 150, 200mm and ∞ (flat-plate), respectively. They were cure to the appropriate hardening temperature (130°C) at the vacuum bag of an autoclave. Composite laminated shells of dimensions 100㎜×140㎜ were prepared. The velocity of the steel ball that transversely impacts a specimen was measured both before and after impact by determining the time for the ball to pass two ballistic-screen sensors located at a known distance apart. In general, the kinetic energy after impact-kinetic energy before impact increased in all specimens. Absorbed energy increased as the curvature increased [03/903]S and [02/902]S which is small interlaminar number, was higher than four interlaminar specimen.

Crashworthiness Analysis and Optimization of Thin-Walled Square Tube with Pyramidal Ripples Based on Mechanics Properties

2012 ◽  
Vol 625 ◽  
pp. 69-74
Author(s):  
Xiao Guang Hu ◽  
Jing Bo Yang
Keyword(s):  
Kinetic Energy ◽  
Impact Load ◽  
Explicit Finite Element ◽  
Surface Method ◽  
Finite Element Technology ◽  
Thin Walled ◽  
Crashworthiness Analysis ◽  
Energy Absorbing ◽  
Impact Kinetic Energy ◽  
Load Simulation

Thin-walled structure absorbs most impact kinetic energy during collision accident,and they are widely used as energy-absorbing element. In order to improve crashworthiness of them, regular pyramidal ripple is added on the thin-walled square tube’s surface. Explicit finite element technology is applied to simulate the behavior of the tube under axial impact load. Simulation data was delt with by Response Surface Method to form a function of variables and response,and the new structure was optimized. Research results show that, the thin-walled square tube with pyramidal ripples can improve controllable of structure deformation obviously and Optimized structure can absorb and dissipate much more impact kinetic energy.

scholarly journals Assessment of a Light Unmanned Aircraft Ground Impact Energy

2012 ◽  
Vol 23 (2) ◽  
pp. 97-104 ◽  
Author(s):  
Zmago Skobir ◽  
Tone Magister
Keyword(s):  
Kinetic Energy ◽  
Impact Energy ◽  
Unmanned Aircraft ◽  
Individual State ◽  
State Regulations ◽  
The Subject ◽  
Impact Kinetic Energy ◽  
Ground Impact ◽  
Equivalent Class

The subject of investigation are unmanned aircraft lighter than 150kg under control by national aviation authorities and therefore prudently requiring harmonized individual state regulations. Originated from a general premise that the unmanned aircraft regulations should evolve from the existing standards for manned aircraft of equivalent class or category, the light fixed wing unmanned aircraft equivalence to the manned aircraft is defined in the form of sets of equivalency and non-equivalency based on the established administrative type of methodology of impact kinetic energy comparison. The basic flight characteristics of the existing operational light fixed wing unmanned aircraft are analyzed assuring proper input for determination of the more realistic unmanned aircraft impact kinetic energy in controlled and uncontrolled flight into terrain crash scenarios used for the evaluation of established methodology adequacy for equivalence determination. It is shown in the paper that determination of the unmanned aircraft equivalency to the manned aircraft should not be based on the unmanned aircraft maximum take-off mass nor their airspeed range alone. KEYWORDS: light unmanned aircraft, impact kinetic energy, hazard potential, classification

Interaction of Hyperthermal Hydrogen with the Diamond Surface

1994 ◽  
Vol 339 ◽  
Author(s):  
David Haggerty ◽  
Christos Bandis ◽  
Bradford B. Pate
Keyword(s):  
Kinetic Energy ◽  
Photoelectron Spectroscopy ◽  
Atomic Hydrogen ◽  
Hydrogen Adsorption ◽  
Ion Source ◽  
Diamond Surface ◽  
Ultraviolet Photoelectron Spectroscopy ◽  
Impact Kinetic Energy

ABSTRACTA mass-selected low kinetic energy (1–50 eV) ion source is used to expose the diamond (111) surface to ionized atomic hydrogen (H+) at controlled impact kinetic energy. We report the result of 20 eV and 50 eV kinetic energy exposures as measured by ultraviolet photoelectron spectroscopy (UPS). UPS is found to be a useful probe of hydrogen adsorption on diamond.

Motion Situation and Kinetic Energy Analysis for Ore Pass of Underground Mine

2011 ◽  
Vol 90-93 ◽  
pp. 383-386
Author(s):  
Yong Heng Huang ◽  
Ping Cao ◽  
Yi Xian Wang
Keyword(s):  
Kinetic Energy ◽  
High Speed ◽  
Impact Damage ◽  
Critical Value ◽  
Impact Angle ◽  
Underground Mine ◽  
Damaged Zone ◽  
Impact Kinetic Energy ◽  
The Impact ◽  
Ore Pass

The fragmentation of ore pass under loading belongs to one of the typical disaster in underground mine. This paper is concerned with the description and explanation of this phenomenon and presents brittle fragmentation for impact damage of rock block based on impact test, high-speed camera was used to study the relation between fragmentation and damage and the effect of the kinetic energy of projectile on them, the experimental results demonstrate that the damaged zone, invasion depth increase with the increase of the kinetic energy of projectile, but are influenced by the impact angle; the results show that prior to the impact kinetic energy reaches the critical value, the energy dissipation is mainly for damaged zone, when the impact kinetic energy increases to the critical value.

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