Modeling the Effects of Size on Patch Dynamics of an Inert Tracer

Mesoscale iron enrichment experiments have revealed that additional iron affects the phytoplankton productivity and carbon cycle. However, the role of initial size of fertilized patch in determining the patch evolution is poorly quantified due to the limited observational capability and complex of physical processes. Using a three-dimensional ocean circulation model, we simulated different sizes of inert tracer patches that were only regulated by physical circulation and diffusion. Model results showed that during the first few days since release of inert tracer, the calculated dilution rate was found to be a linear function with time, which was sensitive to the initial patch size with steeper slope for smaller size patch. After the initial phase of rapid decay, the relationship between dilution rate and time became an exponential function, which was also size dependent. Therefore, larger initial size patches can usually last longer and ultimately affect biogeochemical processes much stronger than smaller patches.

Modifying the atlas of low lunar orbits using inert tethers

For long enough tethers, the coupling of the attitude and orbital dynamics may show non-negligible effects in the orbital motion of a tethered satellite about a central body. In the case of fast rotating tethers the attitude remains constant, on average, up to second order effects. Besides, for a tether rotating in a plane parallel to the equatorial plane of the central body, the attitude?orbit coupling effect is formally equal to the perturbation of the Keplerian motion produced by the oblateness of the central body and, therefore, may have a stabilizing effect in the orbital dynamics. In the case of a tethered satellite in a low lunar orbit, it is demonstrated that feasible tether lengths can help in modifying the actual map of lunar frozen orbits

WW6: an embryonic stem cell line with an inert genetic marker that can be traced in chimeras.

Mutant mice produced by gene targeting in embryonic stem (ES) cells often have a complex or embryonic lethal phenotype. In these cases, it would be helpful to identify tissues and cell types first affected in mutant embryos by following the contribution to chimeras of ES cells homozygous for the mutant allele. Although a number of strategies for following ES cell development in vivo have been reported, each has limitations that preclude its general application. In this paper, we describe ES cell lines that can be tracked to every nucleated cell type in chimeras at all developmental stages. These lines were derived from blastocysts of mice that carry an 11-Mb beta-globin transgene on chromosome 3. The transgene is readily detected by DNA in situ hybridization, providing an inert, nuclear-localized marker whose presence is not affected by transcriptional or translational controls. The "WW" series of ES lines possess the essential features of previously described ES lines, including giving rise to a preponderance of male chimeras, all of which have to date exhibited germ-line transmission. In addition, clones selected for single or double targeting events form strong chimeras, demonstrating the feasibility of using WW6 cells to identify phenotypes associated with the creation of a null mutant.

(Table 1) K-Ar age and inert-gas-isotopes at DSDP Holes 68-501, 69-504B and 69-505B

Conventional K-Ar ages have been determined and inert-gas abundances have been measured on representative samples of altered rocks from Deep Sea Drilling Project Holes 501, 504B, and 505B in an attempt to correlate their degree of alteration with inert-gas and K-Ar data. Samples taken from the first 60 meters below the sediment/basalt interface give significantly higher ages than would be expected from the magnetic stratigraphy, though at greater depths the calculated ages are in broad agreement with the expected age. The inert gas ratios 20Ne/36Ar, 36Ar/84Kr, and 84Kr/130Xe also show a marked discontinuity at the 60-meter depth, and all these effects are interpreted as being a consequence of low-temperature alteration produced by burial metamorphism and by interaction with sea water (halmyrolysis).

Kaiser aluminum weldor's training manual; inert gas process.

Mode of access: Internet.

Determination of the causes of weld-metal cracking in high-strength steels and the development of heat-treatable low-alloy-steel filler wires for use with the inert-gas-shielded arc-welding process

"Materials Central, Contract no. AF 33(616)-5878, Project no. 7351."

Operator's, organizational direct support, general support and depot maintenance manual : welding set, arc, inert gas shielded, water cooled, aluminum welding, general purpose, (Airco model 2351 1209), FSN 3431-731-4163.

"June 1969."

Operator, organizational, field, and depot maintenance manual : welding set, ARC, inert gas shielded, plastic or metal lined gun, for 3/64 in. wire, DC, 115V, (Linde model SWM-9-A) FSN 3431-972-7672.

Includes index.

Organizational maintenance repair parts and special tools lists : welding set, ARC, inert gas shielded, plastic or metal lined gun; for 3/64 in. wire; DC, 115V., (Linde model SWM-9-A) FSN 3431-972-7672.

"May 1970."

Organizational, DS, GS and depot maintenance repair parts and special tools list : welding set, ARC, inert gas shielded, air cooled, metal lined gun for 3/64 in. wire, (Westinghouse model SA-136), FSN 3431-121-5878.

"July 1971."

Operator, organizational, field, and depot maintenance manual : welding set, arc, inert gas shielded, plastic or metal lined gun, for 3/64 in. wire, DC, 115V (Westinghouse model SA-135), FSN 3431-879-9709.

"August 1962."

Organizational and direct support maintenance repair parts and special tools list : welding set, arc, inert gas shielded, water cooled, aluminum welding, general purpose (Airco model 23511209), FSN 3431-731-4163.

"December 1970."

Operator's, organizational, DS, and GS maintenance manual : welding set, arc, inert gas shielded, air cooled, metal lined gun for 3/64 in. wire (Westinghouse model SA-136), FSN 3431-121-5878.

"August 1969."

Operator, organizational, direct support, and general support maintenance manual, including repair parts and special tools list : welding machine, arc, general and inert gas, shielded, transformer-rectifier type, AC and DC, 300 ampere rating at 60% duty cycle (Harnischfeger model DAR-300HFSG), FSN 3431-984-3401, (Harnischfeger model 2100H2007), FSN 3431-926-3746.

Includes index.

Organizational maintenance repair parts and special tools list : welding set, arc, inert gas shielded, plastic or metal lined gun, for 3/64 in. wire, DC, 115V (Westinghouse model SA-135), FSN 3431-879-9709.

Includes index.