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Development of system and materials for detecting leaks in cocoon protective coatings are discussed. Method of applying materials for leak determination is presented. Pressurization of system following application of materials will cause formation of bubble if leak exists.
Verification data for twice-daily analyses of horizontal wind and temperature are compared with 00, 12, 24, 36, 60, and 84 hour forecasts prepared for winter 1975-76 from a six-layer operational forecast model; the comparison focuses on certain energy components in the forecast fields. Significant losses (15 to 20%) of zonal available potential energy and zonal kinetic energy appear beyond the 36-hour forecasts; the zonal kinetic energy loss is associated with a large increase in this parameter during the first 12-hour forecast period, due to a downward and northward movement of the mean jet-stream core. In addition, energy losses in the eddy potential and kinetic energy components are noted in the initialization procedure.
Energy loss from hot or cold piping and process equipment can be measured with good reliability using heat flux transducers and careful monitoring techniques. Two types of industrial instruments are discussed in the paper -- one that wraps externally around pipe and one that can slip within and beyond the overlap of a pipe jacket procedures for using these instruments are being balloted within ASTM committees. Such transducers I can be used to measure energy loss, control process parameters and follow changes off ambient weather conditions for indoor, outdoor, buried and downhole applications. A variation of this instrument can be placed on columns under insulation to act as control sensor for adiabatic operation.
Increases in coral bleaching events over the last few decades have been largely caused by rising sea surface temperatures (SST), and continued warming is expected to cause even greater increases through this century. We use a Global Climate Model to examine the potential of marine cloud brightening (MCB) to cool oceanic surface waters in three coral reef provinces. Our simulations indicate that under doubled CO conditions, the substantial increases in coral bleaching conditions from current values in three reef regions (Caribbean, French Polynesia, and the Great Barrier Reef) were eliminated when MCB was applied, which reduced the SSTs at these sites roughly to their original values.
The mitochondrial genomes of trypanosomatids lack tRNA genes. Instead, mitochondrial tRNAs are encoded and synthesized in the nucleus and are then imported into mitochondria. This also applies for tRNATyr, which in trypanosomatids contains an 11 nt intron. Previous work has defined an exon mutation which leads to accumulation of unspliced precursor tRNATyr. In this study we have used the splicing-deficient tRNATyr as a vehicle to introduce foreign sequences into the mitochondrion of Leishmania tarentolae. The naturally occurring intron was replaced by synthetic sequences of increasing length and the resulting tRNATyr precursors were expressed in transgenic cell lines. Whereas stable expression of precursor tRNAsTyr was obtained for introns up to a length of 76 nt, only precursors having introns up to 38 nt were imported into mitochondr...
The magnetic symmetry and structure of the non-Fermi liquid heavy fermion compound CeNiGa2 has been determined by neutron powder diffraction. The orthorhombic CeNiGa2 compound orders antiferromagnetically below 4.4(2) K at ambient pressure with a magnetic moment magnitude of mu(Ce) = 0.80(4) mu(B) for moments aligned along the c-axis. The magnetic (Shubnikov) space group is C(2c)m'm'm. The nature of the magnetic order of CeNiGa2 is further elucidated by neutron diffraction at elevated pressures up to 4.5 kbar, allowing for the confirmation of a critical pressure P-C of about 4.2(2) kbar above which the magnetic moment ordering is suppressed.
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