Based on the paniculate 234Th export fluxes from 234Th/238U disequilibria and the POC/PTh, ratios in particles, the POC export flux from euphotic zone is estimated to be 16. 0 mmol/(m2·d), in which the export fluxes of living organic carbon and detrital organic carbon are 2.7 and 13.3 mmol/(m2·d), respectively.
The operation results show that when the average SS in the influent water is 4.4 mg/L,the average SS in the effluent water is 0.2 mg/L,which is satisfied with the A1 level of"recommended injection water quality for detrital rock oil reservoirs and analyzing methods"(SY/T 5329-1994).
Comparing the compositions of rhodochrosites in various formations, we can see that the ratios of MgCO_3/CaCO_3 in rhodochrosites from the detrital rock-argillite formation are in the range 0.7—1.8, and those from carbonate and volcano-sedimentary formations vary between 0 and 0.625 and between 1.2 and 4.8, respectively.
(Results The) amount of remaining debris on root canal wall in group C decreased significantly,compared with group A and B.The differences of coronal third and middle third between group A and B,group B and C,group A and C were significant(P<0.05,P<0.01,P<0.05).
Experimental results show that the maximum conversion efficiencey of Xe is 0.75%/2π sr/2%bw at 13.4 nm,and pulse-pulse sability is ±4%(1σ) at 0.5 mm laser-nozzle diatance,the results also show that liquid Xe aerosol spray target LPP source can almost eliminate debris after 10~5 laser shots.
The spectral radiation characteristics,laser-to-EUV conversion efficiency at 13.4 nm and debris production by target material erosion or deposition of the liquid Xe aerosol spray target are studied in detail.
By analyzing its fore-gut content,the proportions of amorphous detritus,fungi and diatoms were 60.40%,3.91%,35.96%. Therefore,the contribution rates of the above types of food to secondary production were 32.2%,10.4%,57.4%.
Elemental and Sm-Nd isotopic geochemistry on detrital sedimentary rocks in the Ganzi-Songpan block and Longmen Mountains
Systematic results of major and trace element geochemistry and Sm-Nd isotopic geochemistry on detrital sedimentary rocks of Precambrian to Triassic in the Ganzi-Songpan block and Longmen Mountains are presented.
Cenozoic uplift of West Qinling, northeast margin of Tibetan plateau-a detrital apatite fission track record from the Tianshui b
Thermochronologic study on the detrital apatite grains from sandstones at Yaodian, near Tianshui, has revealed two rapid tectonic uplift-exhumation events of the source area, which happened at 23.7 and 14.1 Ma, respectively.
Fission-track dating of zircon showed that sandstones from this zone contain detrital zircon of several different-age populations.
Concept and Classification of Coarse Woody Debris in Forest Ecosystems
Coarse woody debris (CWD) is generally considered as dead woody materials in various stages of decomposition, including sound and rotting logs, snags, and large branches.
Experimental data are analyzed that concern the effect of zoogenic debris on the properties of soddy deep podzolic soils and raw-humus brown soils characteristic of southern taiga forests in the Yenisei region of Siberia.
Zoogenic plant debris falling on the ground surface during tree stand defoliation is a short-acting but powerful stimulant of biological activity in the litter; hence, it has a considerable effect on soil properties.
The results of experimental studies on the contribution of zoogenic debris to transformation of soil properties in the southern taiga subzone of Central Siberia are analyzed.
Representatives of gamasid (three species) and uropodid (two species) mites abundant in storm detritus were used as model species.
Unbalanced composition of higher trophic levels results in an unstable functioning of the lake and accumulation of significant amounts of detritus, which is utilized by the abundant microzoobenthic component of the ecosystem.
As against zooplankton, the biomass of zoobenthos features much less contingencies with the biomass of microalgae as well as zooplankton, since detritus, higher plant tissues, and small animals are the basis of the diet of benthic organisms.
Specific structural features of giant fishbone detritus accumulations, which represent organic phosphate deposits with uranium and rare earth elements, are scrutinized.
The obtained results have made it possible to reconstruct paleotectonic and paleogeographic conditions of the formation of orebodies, as well as the mechanism for the accumulation of metalliferous bone detritus.