acceleration experienced was nominally 10 G or less for a 30 ft/s impact ... a flat impact, the acceleration in the spine-to-chest direction is commonly called ...
NASA Website
Pulsed rf heating is a fundamental limit on high-gradient acceleration in copper structures. Reduction of pulsed heating is favored by a short exposure time for the copper; yet in conventional accelerators, efficiency requires an exposure time of order a ...
National Technical Information Service (NTIS)
Apr 1, 2008 ... The Use of a Vehicle Acceleration Exposure Limit Model and a Finite Element Crash Test Dummy Model to Evaluate the Risk of Injuries During ...
Lawrence C. et al., The Use of Vehicle Acceleration Exposure Limit Model and a Finite Element Crash Test Dummy. Model to Evaluate the Risk of Injuries ...
A system is described for acceleration treatment of domestic fowl. A reasonable end point for acceleration tolerance is provided by a bradycardia that occurs fairly close to the lethal limit. In a group of 61 male Rhode Island Red chickens exposed to +6 G...
The threshold values of total absorbed dose for causing changes in tensile properties of a polyetherimide film and the limitations of the absorbed dose rate for accelerated-exposure evaluation of the effects of electron radiation in geosynchronous orbit w...
Acceleration Exposure Limit Model and a. Finite Element Crash Test Dummy Model to. Evaluate the Risk of Injuries During Orion. Crew Module Landings . ...
The accelerators should be properly designed to make the radiation field produced by beam loss satisfy the dose limits. The radiation field for high intensity H? cyclotron includes prompt radiation and residual radiation field. The induced radioactivity in accelerator components is the dominant source of occupational radiation ...
NASA Astrophysics Data System (ADS)
... Accession Number : ADD433694. Title : Accelerated Outdoor Exposure Texting in the Evaluation of Ultraviolet Light Stabilizers for Plastics,. ...
DTIC Science & Technology
... conducted on accelerator facilities, involving zero ... of similar exposures on accelerators. ... IMPACT ACCELERATION, EXPERIMENTAL DATA, HIGH ...
According to recent research, a causal link has been established between occupational exposure to whole body vibration and an increased occurrence of low back pain. To aid in the further development of an in-house health and safety program for a large open pit mining facility interested in reducing back pain among its operators, whole body vibration magnitudes were ...
PubMed
... Title : ANALYSIS OF EXPOSURE FACTORS INFLUENCING THE IMAGE QUALITY IN LINEAR ACCELERATOR RADIOGRAPHY. ...
Medical accelerators operating over 10 MV can induce short-lived radionuclides in components near the beam and in the air (McGinley 1992). We evaluated a Clinac 2100 C/D at 18 MV photon mode for radionuclidic exposure, contamination, and airborne potential to the accelerator staff entering the room after patient radiation treatment. ...
The mechanisms which ultimately limit the voltage of large accelerators are discussed in the light of the operating experiences of the NSF tandem. 3 refs.
Direct measurement of tritium atoms by accelerator mass spectrometry (AMS) enables rapid low-activity tritium measurements from milligram-sized samples and permits greater ease of sample collection, faster throughput, and increased spatial and/or temporal resolution. Because existing methodologies for quantifying tritium have some significant limitations, ...
PubMed Central
A brief, subjective review is given of mechanisms that may be limiting electrostatic accelerator tubes to present levels of performance. Suggestions are made for attacking these limitations with the purpose of stimulating the thinking of designers and users of electrostatic accelerators.
DOE Information Bridge
The threshold values of total absorbed dose for causing changes in tensile properties of a polyetherimide film and the limitations of the absorbed dose rate for accelerated-exposure evaluation of the effects of electron radiation in geosynchronous orbit were studied. Total absorbed doses from 1 kGy to 100 MGy and absorbed dose rates from 0.01 MGy/hr to 100 ...
Energy Citations Database
... the many factors in the weather which contribute ... specimens cut from the weathered sheets of ... during exposure to accelerated weathering cycles in ...
Magnetic resonance elastography (MRE) has been demonstrated to have potential as a clinical tool for assessing the stiffness of tissue in vivo. An essential step in MRE is the generation of acoustic mechanical waves within tissue via a coupled mechanical driver. Motivated by an increasing volume of human imaging trials using MRE, the objectives of this study were to audit the vibration amplitude ...
Magnetic resonance elastography (MRE) has been demonstrated to have potential as a clinical tool for assessing the stiffness of tissue in vivo. An essential step in MRE is the generation of acoustic mechanical waves within a tissue via a coupled mechanical driver. Motivated by an increasing volume of human imaging trials using MRE, the objectives of this study were to audit the vibration amplitude ...
... Accession Number : ADA215287. Title : Guidelines for Safe Human Exposure to Impact Acceleration. Update A. Descriptive Note : Scientific rept. ...
Whenever a new elastomer is formulated or an old formulation is modified, it is important to estimate the material's anticipated lifetime in various use environments. For extended lifetimes (years) this often requires the application of accelerated aging techniques which typically involve the modelling of results obtained at higher-than-ambient environmental stress ...
...false Radiofrequency radiation exposure limits. ...Telecommunication FEDERAL COMMUNICATIONS COMMISSION...1310 Radiofrequency radiation exposure limits. ...published by the National Council on Radiation Protection...
Code of Federal Regulations, 2010
... Exposure Laboratory as well as proton exposures in an accelerator facility at the Australian Nuclear Science and Technology Organisation (ANSTO ...
... will lead to significant advances in the state of the art and will ... specimens were prepared for outdoor exposure at Panama and at Rock Island for ...
Differentiating these symptoms from chronic bronchitis and emphysema in a smoker may be difficult. Accelerated Silicosis -- occurs after exposure to ...
A simple, low cost aperture limiting device with an absorber block has been developed and installed in the AGS ring at Brookhaven National Laboratory. The device intercepts injection tails, transition losses, and the inward spiraling beam of an aborted accelerations or extraction cycle. The resultant consolidation of losses at one point reduces activation ...
A simple, low cost aperture limiting device with an absorber block has been developed and installed in the AGS ring at Brookhaven National Laboratory. The device intercepts injection tails, transition losses, and the inward spiraling beam of an aborted acceleration or extraction cycle. The resultant consolidation of losses at one point reduces activation ...
The Thomas Jefferson National Accelerator Facility (Jefferson Lab) houses a 4 GeV, 200 {micro}A continuous wave (CW) recirculating electron accelerator. This underground accelerator is made up of two superconducting linear accelerators (linacs), two arcs, a beam switch yard (BSY), and three end stations. Each linac ...
The study investigates the acceleration of cosmic rays by superrelativistic plasma waves. The pulsar
NASA Technical Reports Server (NTRS)
...overtorque is limited, that number of the accelerations required by paragraphs (b) through...is not limited, half the required accelerations must be made at the limiting overspeed...spent in incremental running. (5) Acceleration and deceleration runs. 30...
Code of Federal Regulations, 2011
A general theory for particle acceleration by weak hydromagnetic turbulence with a given spectrum of waves is described. Various limiting cases, corresponding to Fermi acceleration and magnetic pumping, are discussed and two numerical examples illustratin...
... Pseudoresonant Laser Wakefield Acceleration ... these mechanisms have practical limits to the max - imum length of the acceleration regions. ...
An improved version of the plasma impulse accelerator for macroparticles is discussed in detail, overcoming the length limitation of the classical railgun. The acceleration of macroparticles by the use of the plasma brim in the cylindrical electrodes is c...
... Title : Radiolabeled Microsphere Technique in Conscious Subjects during Acceleration Exposures on the USAFSAM Centrifuge. ...
... OF OVERT MOTION SICKNESS BY INCREMENTAL EXPOSURE TO OTHERWISE HIGHLY STRESSFUL CORIOLIS ACCELERATIONS,. ...
The objective was to single out complex evoked potentials (CEP) in the bioelectrical activity (BA) of the human cerebral cortex which were induced by linear accelerations. Results indicated that with exposure to linear accelerations of the chosen range it...
Prevention of occupational exposures to chemicals at levels that can cause illness or disease depends upon having exposure limits, methods for measuring exposures, and means for limiting exposures to levels within the established limits. The development ...
... sun exposure or exposure to extreme cold or wind Avoid washing hands with hot water Limit hand ...
MedlinePLUS
This paper discusses a method of estimating proper exposure limits of asbestos to employees of a facility.
... if blood or OPIM exposure is anticipated. Use engineering and work practice controls to limit exposure. OPIM ...
... Accession Number : AD0801630. Title : ACCELERATION LIMIT SWITCH (LEAR 3010-600) PRELIMINARY PERFORMANCE EVALUATION,. ...
NIOSH requested assistance in preventing silicosis in workers exposed to crystalline silica (14808607) during rock drilling. The Alert contained information concerning surface mining processes, silica exposure during surface mine drilling, current exposure limits, health effects of crystalline silica exposure ...
The human fetus, child, and adult may experience adverse health outcomes from parental or childhood exposures to environmental toxicants. The fetus and infant are especially vulnerable to toxicants that disrupt developmental processes during relatively narrow time windows. This review summarizes knowledge of associations between child health and development outcomes and ...
The development of low-cost, durable advanced optical materials is an important element in making solar energy viable for electricity production. It is important to determine the expected lifetime of candidate reflector materials in real-world service conditions. The demonstration of the optical durability of such materials in outdoor environments is critical to the successful commercialization of ...
Osteoporosis is a decrease in bone mineral density (BMD) that predisposes individuals to fractures. Although an elderly affliction, a predisposition may develop during adolescence if a sufficient peak BMD is not achieved. Rat studies have found that lead exposure is associated with decreased BMD. However, human studies are limited. We hypothesized that the ...
New limits on Astronaut radiation exposure are presented. These limits are in radiation protection and measurement (NCRP). (AIP)
BS>Rene 4l was tensile tested at room temperature after creep-exposure or unstressed exposures of 10 to 200 hours at temperatures between 1200 deg and 1800 deg F. Thermallyinduced structural changes reduced strength and ductility after exposures above l500 deg F, while creep strains caused inereased strength and decreased ...
In Finland, the general regulations for the limitation of the radiation exposure are defined in the Finnish Radiation Act (592/9) and Degree (1512/91). This guide specifies the requirements for the limitation of the public exposure in the environment of t...
Commercial space travel may soon be a reality. If so, microgravity, high acceleration, and radiation exposure, all known hazards, will be accessible to the general public. Therefore, space tourism has medical implications. Even though the first flights will feature space exposure times of only a few minutes, the potential may someday ...
It was shown in that one of the limits to the shock surfing acceleration of ions at quasiperpendicular shocks is due to the obliqueness of the shock wave. In this paper, a critical obliqueness is found for the relativistic shock wave, below which the energy gain of the particle due to the shock surfing acceleration, is not ...
sites. Our analysis places no limit on linear accelerators. With the data from the future Auger is the characteris- tic magnetic #12;eld strength in the acceleration region (in gauss), and R kpc is the size- magnetic acceleration to elucidate its inherent and in- evitable limitations. The ...
E-print Network
The surfatron laser-plasma accelerator is an extension of the plasma beat wave accelerator scheme. It utilizes very intense electric fields, 10/sup 9/ to 10/sup 10/ V/cm, associated with focussed laser beams to accelerate particles. (GHT)
A general theory for particle acceleration by weak hydromagnetic turbulence with a given spectrum of waves is described. Various limiting cases, corresponding to Fermi acceleration and magnetic pumping, are discussed and two numerical examples illustrating them are given. An attempt is made to show that the expression for the rate of ...
... Abstract : The main factors limiting tolerance to forward acceleration are dyspnea, chest pain, and difficulty in inspiring. ...
... Flame acceleration and transition to detonation; Initiation and transmission of detonations; Detonation structure and limit propagation; Detonation ...
In this paper we give an introductory discussion of high intensity hadron accelerators with special emphasis on the high intensity feature. The topics selected for this discussion are: Types of acclerator - The principal actions of an accelerator are to confine and to accelerate a particle beam. Focusing - This is a discussion of the ...
The purpose of this study was to test the hypothesis that repeated exposure to high acceleration (G)
... Butadlene/styrene rubber-to-metal vulcanized bonds show no loss ... in both accelerat ed and long term tests. ... and in the accelerated test, while nitrile ...
