A cryogenic air separation system which is subject to periods of significant changes in product demand is controlled during such periods to minimize the impact of transient operation on product purity. A double- column distillation system is utilized in which a nitrogen-rich liquid is withdrawn from...
Plants take in ___ from the air. A. oxygen B. carbon dioxide C. nitrogen D. hydrogen 相关知识点: 试题来源: 解析 B。解析:植物从空气中吸收二氧化碳进行光合作用。选项 A 氧气是动物呼吸所需,选项 C 氮气不是植物直接从空气中大量吸收的,选项 D 氢气不是植物生长所需。反馈...
Atmospheric pollution in Ukraine has become a significant environmental problem, especially in the eastern part where heavy industries are located, and it is particularly severe in industrial centers such as; Zaporizhia, Kryvyi Rih, Dnipropetrovs'k and Dniprodzerzhyns'k. The main emission sources are...
Symptoms of N saturation are particularly severe in high-elevation, nonaggrading spruce-fir ecosystems in the Appalachian Mountains and in eastern hardwood watersheds at the Fernow Experimental Forest near Parsons, West Virginia. In the Los Angeles Air Basin, mixed conifer forests and chaparral water...
This review covers the solubility of nitrogen and air in liquids as a function of temperature and pressure. Solubility data for individual systems were critically evaluated. Recommended or tentative values are presented as smoothing equations and/or in tabular form. Trends in homologous series or rela...
the gap in the period when GEOS meteorological data is unavailable using the means calculated from all the available simulations. Or you may try a single-p... A Referee 被引量: 0发表: 0年 Enhanced nitrogen deposition over China China is experiencing intense air pollution caused in large part...
NITROGEN-AIR BLAST IN NI-CU CONVERTER PURPOSE: To minimize the generation of soft block and to easily remove matte by introducing operation gas containing nitrogen and oxygen into a converter containing molten Ni-Cu matte, controlling oxidation of the matte and also, improvi... U Kaarutsuku,A...
{-1})$ room-temperature spectra of pure $CH_{4}^{+} CH_{4}$ in dry air and $CH_{4}$ in dry nitrogen was recorded in the $2700-3200 cm^{-1}$ spectral region with a signal-to-rms noise of 2000, using the Fourier transform spectrometer in the McMath telescope of the National...
A shielding device is used to change the ambient conditions additionally to the feeding gas composition. Varying the amount of N2and air admixed to the feeding gas as well as changing the shielding gas from N2to air reveals that the highestN2(A3Σu+)is achieved in the case of air ...
(Martiny et al.2019). Physiological assessments of nutrient stress in this system point towards phosphorus (P) limitation; specifically, (i) rates of alkaline phosphatase, an enzyme responsible for scavenging P from the organically bound pool, are strongly enhanced (Ammerman et al.2003; Lomas et...