Balancing of nitrogen

The proportion of the liberated nitrogen which was converted to N0X was also lower for the phenanthridine than the acridine char. It is believed that the balance of nitrogen is released as N2 due to the reduction of N0X by C and/or CO. A high concentration of carbon... 

It has been known for many years that even after exhaustive washes, starch still contains small amounts of noncarbohydrate elements. Lipids account for most of the phosphorus and about one-third of the nitrogen present in wheat starch (Table I). However, amino acids have been recovered from hydrolyzed starch, indicating that the balance of nitrogen is present as proteins. In the case of well-isolated, nondamaged wheat starch, proteins represent 0.15 to 0.2% of its weight. This is a very small proportion of the Hour protein, which comprises all the proteins contained in the... 

The catalysts were evaluated by exposure to a simulated automobile exhaust gas stream composed of 0.2% isopentane, 2% carbon monoxide, 4% oxygen and a balance of nitrogen. The temperature required to oxidize the isopentane and carbon monoxide was used to compare catalyst performance. The chromium-promoted catalyst oxidized isopentane at the lowest temperature, and a mixed chromium/copper-promoted catalyst proved the most efficient for oxidizing carbon monoxide and isopentane. It is interesting to note that the test rig used a stationary engine with 21 pounds of catalyst. Although the catalyst was very effective it is difficult to envisage uranium oxide catalysts employed for emission control of mobile sources. 

Kemp, W. M., and Cornwell, J. C. (2001). Role ofBenthic Communities in the Cycling and Balance of Nitrogen in Florida Bay. Pinal report to the U.S. Environmental Protection Agency, Region 4,... 

Pomazkina, L.V., Radnaev, A.B.D., Kotova, L.G. and Petrova, I.G. (2001) The transformation and balance of nitrogen in fluoride-polluted agroecosystems on gray forest soils of the Baikal region. Eurasian Soil Science, 34, 645-650. 

Figure 3. Landscape-biogeochemical balance of nitrogen in various soil-geochemical catenas.

Regional biogeochemical mass balance of nitrogen in the North Atlantic watershed The overall nitrogen fluxes within and between the terrestrial, groundwater and river systems of the North Atlantic watershed are summarized graphically in Figure 9. 

Depending upon the region, the following items were taken into account for various types of regional biogeoehemical mass balance of nitrogen (Table 11). 

The nitrogen depositions were calculated by two models, HEMISPHERE (Sofiev, 1998) and MOGUNTIA (Dentener Crutzen, 1994), and showed similar values (10.7-11.0 kg/ha/yr.). Application of mineral fertilizers averaged 226kg/ha/yr in South Korean agriculture being the maximum input source in mass balance of nitrogen. 

Regional mass balance of nitrogen in Republic of Korea... 

Describe the regional biogeochemical mass balance of nitrogen on the example of South Korea. Stress your attention on the characteristic features of nitrogen cycle in this country. 

Resch, H. N. (1991). The balance of nitrogen composition in the ERG. In Borght, P., Tychon, B. (Eds). Gestion de I azote agricole et qualite des eaus Vander. Cebedoc, Liege, Belgium. 

Regional mass balance of nitrogen in the Republic of Korea The quantitative parameterization of different input and output links of the N biogeo-chemical cycle in the South Korean peninsula allows us to make up the calculation of two mass balance estimates, for agroecosystems ( 2.0 x 10 ha) and for the whole area of the Republic of Korea. The input/output items for different types of mass balance were estimated in accordance with characteristic fluxes shown in Table 2. 

Present an example of regional biogeochemical mass balance of nitrogen. Discuss the ratio between input and output items for different regions. 

Ehnenhorst, H. and H.-P. Harke Ober die BUanz des Stickstoffes im Cigarettenrauch [On the balance of nitrogen in cigarette smoke] Beitr. Tabakforsch. 4 (1968) 283-286. 

A particular issue is the deactivation of methanation catalysts by carbon formation. Kuijpers et al. [345] observed significant carbon formation over a nickel/kieselgur catalyst containing 54wt.% nickel when exposed to a mixture of 10 vol.% carbon monoxide, 15 wt.% hydrogen, with a balance of nitrogen at 0.6 bar pressure and a 250 °C reaction temperature. Carbon filaments were found, which contributed to 10 wt.% of the catalyst mass at the inlet of the fixed bed. A nickel/silica catalyst showed practically no coke formation for 1000 h duration under the same conditions. 

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