71 research outputs found
Some observations on foreign grassland and related research: April - July 1970 Van Dyne trip report
No full textLimited Distribution.September 1970
Health Hazard Evaluation Report: HETA-83-307-1561: U.S. Environmental Protection Agency, Chem-Dyne Hazardous Waste Site; Hamilton, Ohio
No full textArea and personal air samples were analyzed for trace metals, acid anions, pesticides, polychlorinated biphenyls (PCBs), polynuclear aromatic (PNA) compounds, nitrosamines, and other hydrocarbons at the Chem Dyne hazardous waste site (SIC-4783, SIC-9511), Hamilton, Ohio, on June 7 to 10, 1983. The evaluation was requested by EPA as part of an inter-agency agreement to evaluate health and safety conditions for EPA and contract employees during drum removal operations at the site. A total of 195 samples, including 57 personal samples, were analyzed. The concentrations of all substances were below their OSHA standards. Two arsenic (7440382) samples, containing 3.0 and 3.4 micrograms arsenic per cubic meter (microg/m3), exceeded the NIOSH recommended criterion of 2microg/m3. No PCBs, PNA, chlorinated pesticides, or nitrosamines were detected. The workers wore respiratory and skin protection. The author concludes that chemical exposures during drum removal operations at the site are minimal. The only potential over exposure is from arsenic. Since one of the arsenic samples was collected inside the contractor laboratory trailer which was well equipped with exhaust hoods and other safety devices, reassessment of on-site sample handling procedures is recommended
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A Plea for Fewer but More-Significant Digits
No full textUsing data from this journal, the author shows how considerable savings can be made in space and in reading time by rounding tabulated data.This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries.The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform August 202
Testing Management-Oriented Hypotheses with Simulation Models
No full textAuthor Institution: College of Forestry and Natural ResourcesWe need to manage and to use our renewable resources more wisely and yet more intensively in the future. To do this we need to incorporate more of our experience, our data, and our theory into the decision-making process. We can use simulation models in this synthesis effort to advantage. We can perform management experiments with ecosystem level models, generate meaningful output from those experiments, and condense and interpret this output in a manner useful to the management agency personnel. The result will be better resource management decisions based on scientifically and technically defendable information which will have greater internal consistency and which will produce better results under many conditions
The Effects of Malnutrition on Cardiac Function in African Children
No full textThesis (Master's)--University of Washington, 2015Objective: To assess the effect of malnutrition on cardiac function in hospitalized African children. Design: Prospective cross-sectional study. Setting: Public referral hospital in Blantyre, Malawi. Patients: We enrolled 272 stable, hospitalized children ages 6-59 months, with and without WHO-defined severe acute malnutrition. Main outcome measures: Cardiac index, heart rate, mean arterial pressure, stroke volume index, and systemic vascular resistance index were measured by the Ultrasound Cardiac Output Monitor (USCOM, Ltd, NSW, Australia). We used linear regression with generalized estimating equations controlling for age, sex, and anemia. Results: Our primary outcome, cardiac index, was similar between those with and without severe malnutrition: β=0.17 L/min/m2, (95% CI: -0.17, 0.51 L/min/m2). No difference was found in heart rate or stroke volume index. However, mean arterial pressure and systemic vascular resistance index were lower in children with severe malnutrition: β =-8.6 mm Hg (95% CI: -12.7, -4.6 mm Hg) and β =-200 dyne s/cm5/m2 (95% CI: -320, -80 dyne s/cm5/m2), respectively. Conclusions: In this largest study to date of cardiac function in malnourished children we found that that cardiac function is preserved in stable, hospitalized subjects. Lower mean arterial pressure and systemic vascular resistance index may indicate that these children are in a hypermetabolic state due to early effects of refeeding. Further study is needed to determine if cardiac function is diminished in unstable malnourished children
A High IIP2 SAW-Less Superhetero-dyne Receiver with Multi-Stage Harmonic Rejection
No full textIn this paper, we propose and demonstrate the first fully integrated surface acoustic wave (SAW)-less superheterodyne receiver (RX) for 4G cellular applications. The RX operates in discrete-time domain and introduces various innovations to simultaneously improve noise and linearity performance while reducing power consumption: a highly linear wideband noise-canceling low-noise transconductance amplifier (LNTA), a blocker-resilient octal charge-sharing bandpass filter, and a cascaded harmonic rejection circuitry. The RX is implemented in 28-nm CMOS and it does not require any calibration. It features NF of 2.1-2.6 dB, an immeasurably high input second intercept point for closely-spaced or modulated interferers, and input third intercept point of 8-14 dBm, while drawing only 22-40 mW in various operating modes.European Research Counci
THE EMISSION SPECTRA OF SOME FREE POLYATOMIC RADICALS
No full textAuthor Institution: Division of Physics, National Research Council, OttawaTwo methods of exciting the spectra of free radicals are described. The first is, essentially, a photochemical method. A vapour is irradiated with short-wavelength (Schumann region) radiation. In this frequency range one quantum is sufficiently energetic to dissociate the molecule into two radicals or atoms, one of which is electronically excited. The spectrum of the radical or atom is then observed as a fluorescence. The second method consists of a high-frequency (electrodeless) discharge in which the conditions of power input, pressure, and rate of flow have been adjusted to give mild excitation such that the spectra of secondary (diatomic) decomposition products are not predominant. The Ethylene Flame Bands, attributed by their discoverer to the radical HCO, have been observed in fluorescence in formaldehyde, and a few of the stronger members of the system have been excited in a discharge in formaldehyde. These observations support the original assignment which has recently been criticized. A band system lying in the blue and near ultraviolet can be observed in fluorescence in formic acid. This was originally attributed to the HCO radical, but the present work has shown that it is more probably due to the radical. The band system can also be excited in the discharge in formic acid with much higher intensity. A new band system excited in the discharge in fast flowing acetylene is briefly described. The emitter is not known; but it is, fairly certainly, polyatomic
Design metrics for evaluating the propulsive efficiency of future ships
No full textThere is an increasing need for the ship design process to take account of environmental issues such as the emission of greenhouse gases and the likely extension of a carbon dioxide charging mechanism to international shipping. These issues, together with the need for economic viability, provide further incentives to improve the efficiency of propulsion of ships. The main components of powering are firstly reviewed. Individual components and other power saving devices are identified which should contribute to improvements in the overall efficiency of propulsion. Suitable design metrics and procedures, taking into account economic and environmental factors, are recommended for the design of future ships
L. Frank Baum Collection
No full textThe L. Frank Baum collection includes two manuscripts by the American children's book author, who is best known for writing The Wonderful Wizard of Oz (1900). The manuscripts represent The Magic of Oz (published posthumously in 1919) and The Tin Woodman of Oz (1918). The Magic of Oz is written on the versos of two earlier manuscripts published under the pseudonym Edith Van Dyne.
This collection was digitized as part of Project REVEAL (Read and View English & American Literature)
The effect of silica nanoparticles (SNP) on surface tension of commercial surfactant
No full textEnhanced Oil Recovery (EOR) is one of promising method to increase the national oil production in Indonesia. Chemical EOR by adding surfactant to reservoir may decrease the interfacial tension (IFT) values, alter the wettability of rock and hence may increase the production. In this work, the influence of Silica Nano Particle (SNP) addition to the IFT of commercial EOR surfactant has been investigated. We found that without addition of surfactant, the liquid sample with only containing SNP gave high IFT value at ca. 10-1 dyne/cm. Addition of surfactant has decreased the IFT and variation of surfactant concentration gave the value of CMC value after dilution of 10x. The effect of adding silica nanoparticles (SNPs) to commercial surfactants showed that addition of SNP may decrease the IFT value from 3.10-3 dyne/cm to 5.10-4 dyne/cm. The photograph from IFT measurement also indicated that SNP gave more stable mixture during IFT measurement. By varying the volume of SNP added to the system, it was found that finding optimum volume is important as excessive addition of SNP may result in higher IFT values. This study may provide a further pathway to investigate the influence of SNP addition to large scale EOR Project in Indonesia. © 2022 Author(s)
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