Davis studies

Davis studied the dehydration of urea nitrates as a route to iV-nitroureas. The nitrate salt of iV-methylurea undergoes dehydration-rearrangement on treatment with concentrated sulfuric acid to give Af-nitro-A -methylurea in 42 % yield. In this compound the nitro and methyl groups are attached to the same nitrogen and so its hydrolysis can provide a route to methylnitramine. In contrast, the nitrate salts of ethyl, n-propyl, n-butyl and n-amyl ureas, give iV-nitro-A -ethylurea (49 %), A -nitro-A -propylurea (60 %), iV-nitro-iV -butylurea (67 %) and iV-nitro-A -amylurea (67 %), respectively, on treatment with concentrated sulfuric acid. 

H. Davy Studies the oxidation of methane on platinum wires. 1817... 

Sethuraman, K. J., and G. S. Davies, Studies on solids mixing in a double-cone blender. Powder Technol. 5 115-118, 1971. 

The Second Davis Study A Mixed-Motivation Experiment... 

Irish and Davis studied the effect of solvation on the spectra of this NOJ ion and the splitting of the Vj band. They found that H bonding removes the degeneracy of this mode. The symmetry change would be from to 2h and this is interpreted to mean that hydration effects have brought about a nonequivalence of the 0 atoms in NOj, a most unexpected effect. 

Davis studied the hydrogenation of ethylene to ethane in a catalytic recycle reactor operated at atmospheric pressure (R. J. Davis, Ph.D. Thesis, Stanford University, 1989.) The recycle ratio was large enough so that the reactor approached CSTR behavior. Helium was used as a diluent to adjust the partial pressures of the gases. From the data presented, estimate the orders of the reaction rate with respect to ethylene and dihydrogen and the activation energy of the reaction. 

In 1954 McNesby and Davis studied the kinetics of photooxidation (under the action of the 2537 A. line of mercury) of n-heptanal, either as a liquid or in solution in cyclohexane, at a temperature of about 30°C. The rate of oxidation of this aldehyde would, they claimed, be initially proportional to the oxygen pressure Fo and would then become independent of oxygen pressure between 200 and 400 mm. Hg. However, at higher pressures, the rate would once again become proportional to Po,. This latter finding is completely unexpected and has not been observed in any other reaction of aldehyde photooxidation. 

Davis et al (1985) screened 57 dif rent woody and herbaceous biomass feedstocks for their production of liquid hiel constituents from indirect liquefaction of powdered materials in a fluidized b. Composition metrics in Davis studies were ash, proteins, polyphenols, oil, and hydrocarbon content as defined and measured by the USOA (Ibr example, in Adams, et al, 1986 Buchanan, et al, 1980a Roth et al, 1984 Swanson, et al 1979). We will call the USDA-measured compositions traditional" fcr purposes of this article. These feed compositions were correlated with pyrolysis gas production of hydrogen, CO, CjH4, total olefins, paraffins, and H2/CO ratio using direct regression equations of the quadratic type, but tar/char production was not addressed. 

Matsushita, T. and F.F. Davis Studies of pseudouridylic acid synthetase from various sources Biochim. Biophys. Acta 238 (1971) 165-173. 

In the study by Abdulla et al. (1981), subjects were asked to provide duplicate food samples by visual measurement rather than weighed records, thus increasing the likelihood of underestimation of iodine intake. However, in addition, the urinary excretion of sodium, potassium and nitrogen was compared with the corresponding intake values to test the validity of the duplicate portion collections. Results from their analysis indicated that, as in the Lightowler and Davies study, females, but not males, underestimated their duplicate food collections. 

The University of California at Davis (UC Davis)-Semiconductor Industry Association (SIA) study was proposed in 1988 and implemented in 1989. The UC Davis study was designed to test the h5 othesis that semiconductor manufacturing presents an increased risk of miscarriage to female workers. This was a h5 othesis testing study rather than the... 

All exposure assessments that qualitatively or quantitativelyestimate employee exposures to chemical or physical agents should be retained indefinitely. This practice provideshistorical documentation in the event an employee or ex-employee develops a chronic adverse health effect that may be related to his or her occupational exposure. It also provides the epidemiologist with useful information in the event of aretrospective health study such as the recently performed U. C. Davis study sponsored by the Semiconductor Industry Association. 

Few other models are also there on literature to predict permittivity of composites having fiber or fibrous inclusions. For example, Davies studied this problem theoretically and derived approximate formulas for both isotropic and axially symmetric cases [47-48]. Various formulas were derived corresponding to different geometries of the fiber and matrix phases. However, experimental validation was not given in the study by the author. 

The incidence of false positive results was not reported in the Dewberry Davis study. However, several elements sometimes found in paint films can be expected to contribute to false positive results if present in sufficient concentrations and suitable chemical form these include copper, cobalt, mercury, manganese, and iron. Vind et al. (1976) reported that positive responses were not obtained under typical testing conditions for iron oxide pigments. In contrast, they found that neat biocides (containing mercury or copper) and driers (containing cobalt or manganese) did turn black in the presence of sulfide ions. However, they concluded that given the usually low concentrations of these materials in paints, interference due to these elements would be minimal. 

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