7,619 research outputs found
Avenues of future research in homotransplantation of the liver with particular reference to hepatic supportive procedures, antilymphocyte serum, and tissue typing
Three general areas of research which bear on the developing field of liver transplantation are reviewed. These are: (1) the prospects of obtaining better immunosuppression with particular reference to heterologous antilymphocyte serum; (2) the possible use of antigen matching technics as an advanced indicator of donorrecipient histocompatibility; (3) a simlified system of extracorporeal transplntation designed to provide teporary hepatic support. © 1966
Photoelectron diffraction: from phenomenological demonstration to practical tool
The potential of photoelectron diffraction—exploiting the coherent interference of directly-emitted and elastically scattered components of the photoelectron wavefield emitted from a core level of a surface atom to obtain structural information—was first appreciated in the 1970s. The first demonstrations of the effect were published towards the end of that decade, but the method has now entered the mainstream armoury of surface structure determination. This short review has two objectives: First, to outline the way that the idea emerged and the way this evolved in my own collaboration with Neville Smith and his colleagues at Bell Labs in the early years: Second, to provide some insight into the current state-of-the art in application of (scanned-energy mode) photoelectron diffraction to address two key issue in quantitative surface structure determination, namely, complexity and precision. In this regard a particularly powerful aspect of photoelectron diffraction is its elemental and chemical-state specificity
An Appreciation
To the Officers and Soldiers of the Twentieth Engineers and Attached Service Troops
Scholastic Records and Personality and Character Traits of the Public-school Trained and the Parochial-trained Students of the Graduating Class of 1952, Central High School, Aberdeen, South Dakota
For many years at Aberdeen, South Dakota, a difference of opinion has existed regarding the relative academic achievement, rank in class, and social adjustments of the students in the public school system and parochial -school system. The advocates of the two school systems have base their opinions on observations only and without the benefit of statistical evidence. To present impartial evidence upon which the proponents may form a more logical conclusion was the purpose of the investigator. The purpose of this study was to compare the students who had received the first nine years of their training in a parochial school with those who had received their training in a public school to see if there were any statistical differences in their performance during the last three years of their high-school training in the public school. They were compared in mental ability, academic achievement, rank in class, and social ability development by the investigation cf the high school records of the graduating class of 1952. The school performances made by these students grouped into their respective origins were the records used in making the comparisons
Textual affinities of Papyrus Bodmer XV (p75)
https://place.asburyseminary.edu/ecommonsatsdissertations/2093/thumbnail.jp
Use of an index to reflect the aggregate burden of long-term exposure to criteria air pollutants in the United States.
Air pollution control in the United States for five common pollutants--particulate matter, ground-level ozone, sulfur dioxide, nitrogen dioxide, and carbon monoxide--is based partly on the attainment of ambient air quality standards that represent a level of air pollution regarded as safe. Regulatory and health agencies often focus on whether standards for short periods are attained; the number of days that standards are exceeded is used to track progress. Efforts to explain air pollution to the public often incorporate an air quality index that represents daily concentrations of pollutants. While effects of short-term exposures have been emphasized, research shows that long-term exposures to lower concentrations of air pollutants can also result in adverse health effects. We developed an aggregate index that represents long-term exposure to these pollutants, using 1995 monitoring data for metropolitan areas obtained from the U.S. Environmental Protection Agency's Aerometric Information Retrieval System. We compared the ranking of metropolitan areas under the proposed aggregate index with the ranking of areas by the number of days that short-term standards were exceeded. The geographic areas with the highest burden of long-term exposures are not, in all cases, the same as those with the most days that exceeded a short-term standard. We believe that an aggregate index of long-term air pollution offers an informative addition to the principal approaches currently used to describe air pollution exposures; further work on an aggregate index representing long-term exposure to air pollutants is warranted
Adsorbate-induced surface stress, surface strain and surface reconstruction : S on Cu(100) and Ni(100)
Density functional theory (DFT) calculations have been applied to investigate the known difference in behaviour of S adsorption on Cu(100) and Ni(100). Both surfaces form a 0.25 ML (2 × 2) adsorption phase, but while at higher coverage a 0.5 ML c(2 × 2) phase forms on Ni(100), on Cu(100) only a reconstructed 0.47 ML (√17 × √17)R14° structure occurs. Calculations of the energy, structure, and surface stress of (2 × 2) and c(2 × 2) phases on both substrates show there is an energy advantage on both surfaces to form the higher coverage phase, but that both surfaces show local surface strain around the S atoms in the (2 × 2) phase, a phenomenon previously investigated only on Cu(100). More than forty different structural models of the Cu(100)(√17 × √17)R14°-S phase have been investigated. The pseudo-(100)c(2 × 2) structure previously proposed, containing 16 Cu adatoms per unit mesh in the reconstructed layer, is found to be less energetically favourable than many other possible structures, even after taking account of local structural relaxations. Significantly more favourable is a structure with 12 Cu adatoms per (√17 × √17)R14° unit mesh, previously proposed on the basis of scanning tunnelling microscopy (STM), and found to yield simulated STM images in good agreement with experiment. This model has all S atoms in local 4-fold coordinated hollows relative to the Cu atoms below, half being located above Cu adatoms with the remainder lying above the underlying outermost substrate layer. However, an alternative model with only 4 Cu adatoms and with half the S atoms at 3-fold coordinated sites on the periphery of the Cu adatom cluster, has an even lower energy and gives simulated STM images in excellent agreement with experiment
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