Hospital nurses' views about physical restraint use with older patients

1. A survey of knowledge, practice and attitudes about physical restraints was completed by nursing staff (RN, LPN, CNA) from four hospitals. 2. Nurses from both geriatric and geropsychiatric units reported significantly more educational activities about restraint use than did nurses on medical units. 3. RNs had the highest knowledge scores (56%), but lacked specific information about the dangers associated with restraint use. 4. While education about restraints is important, staff need role models who can help them problem solve and examine alternatives to restraints.     

Seismic considerations in siting and design of power plants

A methodology which provides guidelines for the preliminary evaluation of the safety of nuclear power stations subjected to strong vibratory ground motions from earthquakes is outlined. The methodology includes a procedure for estimating a spectral envelope of ground motion at the reactor site. On the basis of this ground motion the seismic response of structural systems and equipment of the power plant can be estimated. A comparison of the expected seismic response of these systems with their strength and functional capabilities yields an evaluation of the safety of the power plant systems studied.     

Forced vibration tests and analyses of nuclear power plants

Methods for conservatively predicting the response of a constructed nuclear power plant to earthquake excitations are presented. This approach is based on experimental testing of the reactor plant and using test results to develop a mathematical model of the system. First, steady state forced vibration tests are conducted using structural vibrators attached to the reactor structure to determine dynamic response characteristics. Second, modal analysis applied on a digital computer is used to create a linear multiple-degree-of-freedom model that has dynamic response characteristics nearly the same as the physical system for the experimental inputs. Finally, the input force levels are extrapolated from the levels of the inertial vibrators to earthquake levels and the response of the model is calculated for strong-motion earthquakes.Tests have been conducted on three nuclear power plants: the experimental gas-cooled reactor (EGCR) at Oak Ridge, Tennessee; the Carolinas-Virginia tube reactor (CVTR) at Parr, South Carolina; and the San Onofre Nuclear Generating Station (SONGS), San Onofre, California. Analyses in varying detail have been performed; the most extensive work has been done at San Onofre. This article summarizes test results, dynamic models, and the results of seismic response calculations for each plant.     

The external costs of traffic injury: Definition, estimation, and possibilities for internalization

The external costs of traffic injury in Norway are estimated. External costs are all costs that are imposed on others and not borne by the person whose activity generates the costs. Three types of external cost are identified: system externalities, physical injury externalities, and traffic volume externalities. System externalities are costs that road users impose on the rest of society. Physical injury externalities are costs that one group of road users imposes upon another in crashes in which both groups are involved. Traffic volume externalities are the costs imposed on other road users when an additional road user joins traffic. System externalities are estimated to be about 30% of the total cost of traffic injury. Physical injury externalities are estimated to be about 10% of the total cost of traffic injury. No precise estimate can be given for traffic volume externalities. Possibilities for internalizing the external costs are discussed. In Norway, current taxes on ownership and use of motor vehicles cover the external costs of traffic injury, although the taxes were not designed with this purpose in mind.     

Derivation of a threshold function for the Advanced Very High Resolution Radiometer 3.75 µm channel and its application in automatic cloud discrimination over snow/ice surfaces

The distinct contrast between the reflectance of solar radiation in Advanced Very High Resolution Radiometer (AVHRR) channel 3 (3.75?µm) by clouds and by bright surfaces provides an effective means of cloud discrimination over snow/ice surfaces. A threshold function for the top-of-atmosphere (TOA) albedo in channel 3 (r ₃) is derived and used to develop an improved method for cloud discrimination over snow/ice surfaces that makes explicit use of TOA r ₃. Corrections for radiance anisotropy and temperature effects are required to derive accurate values of r ₃ from satellite measurements and to utilize the threshold function. It has been used to retrieve cloud cover fractions from National Oceanic and Atmospheric Administration (NOAA)-14 AVHRR data over the Arctic Ocean and over the North Slope of Alaska (NSA) Atmospheric Radiation Measurement (ARM) site in Barrow, Alaska. The retrieved cloud fractions are in good agreement with SHEBA (Surface HEat Budget of the Arctic Ocean) surface visual observations and with NSA cloud radar and lidar observations, respectively. This method can be utilized to improve cloud discrimination over snow/ice surfaces for any satellite sensor with a channel near 3.7?µm.     

SURF imaging: in vivo demonstration of an ultrasound contrast agent detection technique

A dual-band method for ultrasound contrast agent detection is demonstrated in vivo in an animal experiment using pigs. The method is named Second -order UltRasound Field Imaging, abbreviated SURF Imaging. It relies on simultaneously transmitting two ultrasound pulses with a large separation in frequency. Here, a low-frequency pulse of 0.9 MHz is combined with a high-frequency pulse of 7.5 MHz. The low-frequency pulse is used to manipulate the properties of the contrast agent, and the high frequency pulse is used for high-resolution contrast detection and imaging. An annular array capable of transmitting the low- and high-frequency pulses simultaneously was constructed and fitted to a mechanically scanned probe used in a GE Vingmed System 5 ultrasound scanner. The scanner was modified and adapted for the dual-band transmit technique. In-house software was written for post-processing of recorded IQ-data. Contrast-processed B-mode images of pig kidneys after bolus injections of 1 mL of Sonovuer are presented. The images display contrast detection with contrast-to-tissue ratios ranging from 15-40 dB. The results demonstrate the potential of SURF Imaging as an ultrasound contrast detection technique for clinically high ultrasound frequencies. This may allow ultrasound contrast imaging to be available for a wide range of applications.     

Penetration Resistance of Offshore Skirted Foundations and Anchors in Dense Sand

Penetration of skirts is an essential design issue for offshore skirted foundations and anchors in sand. Skirts may not penetrate far enough into dense sand by the available submerged weight alone. It may therefore be necessary to apply underpressure inside the skirt compartment to produce an increased driving force and to reduce the penetration resistance. This paper recommends procedures to calculate penetration resistance and required underpressure for skirts penetrated in dense sand with and without interbedded clay layers. The recommendations are based on interpretation of skirt penetration data from prototypes, field model tests, and laboratory model tests in dense sand. The paper first presents a model to calculate the penetration resistance of skirts penetrated by weight, or other external vertical load that does not cause flow of water in the sand. Two models are considered; one based on bearing capacity equations with friction angles from laboratory tests, and the other one based on empirical correlations with CPT tip resistance. The bearing capacity model gives more consistent correlations with the empirical data than the CPT model. Thereafter, a model to account for the effect of underpressure applied inside the skirt compartment is proposed. This model is developed based on interpretation of available prototype and model test data from skirts penetrated by underpressure. The results show that underpressure facilitates skirt penetration in sand considerably by providing both an additional penetration force and a reduced penetration resistance. It is also shown that interbedded clay layers can prevent flow of water through the sand and eliminate the beneficial reduction in penetration resistance.     

Urea-formaldehyde resins 4. Formation of condensation products during resin preparation

The formation of diurea compounds containing methylene and dimethylene ether bridges, respectively, as well as the formation of more highly condensed compounds during the preparation of urea-formaldehyde resins under different conditions have been investigated. The quantitative determination of each individual diurea compound was carried out by means of liquid chromatography. Identification of diurea compounds with a dimethylene ether bridge was made by ¹H-NMR spectroscopy.