Oxides of nitrogen

Tham khảo sách 'selective catalytic reduction technology for the control of nitrogen oxide', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

28p nt18101 29-04-2013 31 4   Download

Cr2O3/sepiolite samples with different loadings have been synthesized from corresponding nitrate salts at constant pH conditions and characterized by several physical methods including X-ray diffraction, TEM, nitrogen physisorption, and TGA, etc. The asprepared materials have large surface area, high distribution of Cr2O3 nanoxides on the nanofibrous sepiolite. The prepared solids were used as heterogeneous catalysts for the oxidation of benzyl alcohol with t-BuOOH. Chromium oxides were found to be active sites for the liquid oxidation of benzyl alcohol to aldehyde.

8p cumeo2009 30-07-2018 7 0   Download

I was delighted to respond to an invitation from Ventus Publishing to write a book on atmospheric pollution. It is a topic well enough served by books in the past, but has become increasingly important during these early years of the 21st Century. I believe therefore that there is a place for a review like this one and that notwithstanding the immense activity in the area the book will have a reasonable shelf life. This is because it continually relates the discussion to the principles of physics and chemistry, and these do not change....

0p sofia11 08-05-2012 52 12   Download

Ozone (O3) is a secondary pollutant formed in the atmosphere throughout a complex non-linear chemical reaction involving two classes of precursors: the reactive volatile organic compounds (VOCs) and the oxides of nitrogen (NOx) in the presence of sunlight. The rapid urbanization and industrialization in Vietnam have brought about high air pollutant emissions including the O3 precursors. Ground level O3 may already be high in large cities like Hanoi and Ho Chi Minh City. The O3 episode is very important for scene of view of photochemical smog in Hanoi.

7p dem_thanh 22-12-2012 21 4   Download

Polyamine oxidases are FAD-dependent enzymes catalyzing the oxidation of polyamines at the secondary amino groups.Zea maysPAO (ZmPAO) oxidizes the carbon on the endo-side of the N5-nitrogen of spermidine (Spd) and spermine (Spm).

13p mobifone23 07-01-2013 22 3   Download

The principal pollutants from the transport sector responsible for adverse health effects include lead, various types of particulate matter, ozone (formed from atmospheric reactions of oxides of nitrogen [Nox] and volatile organic compounds [VOCs]), various toxic VOCs, nitrogen dioxide, carbon monoxide, ammonia and sulphur dioxide. However, the proportion of these various pollutants attributable to the transport sector varies significantly across different cities, as indicated by the table below.

392p saimatkhauroi 01-02-2013 26 3   Download

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành y đề tài: Fluctuations of inspired concentrations of nitric oxide and nitrogen dioxide during mechanical ventilation...

6p thulanh16 22-10-2011 28 2   Download

I was delighted to respond to an invitation from Ventus Publishing to write a book on atmospheric pollution. It is a topic well enough served by books in the past, but has become increasingly important during these early years of the 21st Century. I believe therefore that there is a place for a review like this one and that notwithstanding the immense activity in the area the book will have a reasonable shelf life. This is because it continually relates the discussion to the principles of physics and chemistry, and these do not change....

109p tuanloc_do 04-12-2012 40 1   Download

Cytidine 5¢-triphosphate synthase catalyses the ATP-dependent formation of CTP from UTP using either ammonia orL-glutamine as the source of nitrogen. When glutamine is the substrate, GTP is required as an allosteric effector to promote catalysis. Limited trypsin-catalysed proteolysis, Edman degradation, and site-directed muta-genesis were used to identify peptide bonds C-terminal to three basic residues (Lys187, Arg429, and Lys432) of Escherichia coliCTP synthase thatwere highly susceptible to proteolysis. ...

12p fptmusic 16-04-2013 26 1   Download

According to the planning of cattle and poultry slaughterhouse and processing systemup towards 2020, Hanoi city approvedwith 10 planned industrial slaughterhouse sites and 34 planned semi-industrial slaughterhouse sites. The amount of slaughterhouse wastewater is calculated of about 2,300-6,100 m3 / day, excluding wastewater from small and uncontrolled slaughterhouses.

5p vinobita2711 31-05-2019 0 0   Download

Hydrogen fuel cells are one of the most promising alternatives to internal combustion engine hybrids and pure battery electric power for propelling passenger vehicles. Compared to internal combustion engine hybrid vehicles burning hydrocarbon fuels, fuel cell vehicles offer three primary advantages. First, the fuel cell system produces no tank-to-wheel carbon dioxide emissions and no other harmful emissions such as oxides of nitrogen, carbon monoxide, or particulates. Second, the fuel cell system offers the potential for approximately 30% higher well-to-wheel energy efficiency.

13p congdat261 24-11-2010 75 24   Download

Secondary aerosol is produced by the oxidation of primary gases (sulphur dioxide, SO2, nitrogen oxides, NOx, and volatile organic compounds, VOCs,) to sulphuric and nitric acid, and organic vapours, followed by their gas-particle conversion [26, 77]. Finally, some of these acidic gases can be neutralised by reaction with ammonia gas or calcium carbonate (calcite) forming secondary aerosol (ammonium sulphate, ammonium nitrate, calcium sulphate, calcium nitrate).

56p saimatkhauroi 01-02-2013 33 7   Download

Applying much more phosphorus fertilizer and manure than crops can use builds up phosphorus in soil. After continuous over-fertilization, agricultural fields become a persistent reservoir for phosphorus that ends up polluting water bodies. Recent USGS study found that in the agricultural Midwest, many streams have their highest nitrogen concentrations in the spring, peaking in April-May.

0p saimatkhauroi 01-02-2013 25 4   Download

Hydrogen cyanide (HCN) : do sự đốt cháy len, tơ lụa, nylon, và polyurethane, thường được tìm thấy trong đồ đạc và giấy tờ. Aldehydes, acrolein : gỗ, bông, giấy, và các vật liệu bằng chất dẻo (plastic). Hydrogen chloride, phosgene : do nhiệt phân các chất trùng hợp có chlore ; polyvinyl chloride (chất cách nhiệt dây dẫn điện) ; chlorinated acylics ; và đồ phủ tường, sàn nhà, và đồ đạc trong nhà Oxides of nitrogen : nitrocellulose film Sulfur dioxide, hydrogen sulfide : cao su.

13p thiuyen111 11-04-2011 27 3   Download

Peroxyacyl nitrate (PAN) concentrations measured at a commercial site approximately 7 km north of the La Merced site were similar to those found in Los Angeles during the early 1970s. 16 PAN levels exceeded 30 ppb on five of the days sampled and exceeded 10 ppb on all but a few days of the study. 17 Although there is no air quality standard for PAN, high PAN concentrations are a good indicator of the organic oxidizing capacity of the urban air mass, since they are directly connected to organic peroxy radical formation and nitrogen dioxide (both ozone-forming precursors).

17p doipassword 01-02-2013 33 3   Download

Salvinorin A is a potent kappa opioid receptor (KOP) agonist with unique structural and pharmacological properties. This non-nitrogenous ligand lacks nearly all the structural features commonly associated with opioid ligand binding and selectivity. This study explores the structural basis to salvinorin A binding and selectivity using a combination of chimeric and single-point mutant opioid receptors.

9p inspiron33 26-03-2013 20 3   Download

The synthetic immunomodulator muramyl dipeptide (MDP) has been shown to induce, in vivo, mitochondrial proton leak. In the present work, we extended these findings to the cellular level and confirmed the effects of MDPin vitro on murine macrophages.

11p cosis54 04-01-2013 27 2   Download

These efforts have attenuated the emissions engendered by growth, but 24-hour PM10 (particulate matter with aerodynamic diameter less than 10 m) concentrations exceeding several hundred µg/m3 are still measured at many monitoring sites. 1,2 A persistent haze blankets the city, especially during winter, and there is great concern among residents and visitors about the effects of suspended particles on health. Aerosols that contribute to this visibility degradation are usually a combination of primary and secondary particles.

10p doipassword 01-02-2013 15 2   Download

Riftia pachyptila(Vestimentifera) is a giant tubeworm living around the volcanic deep-sea vents of the East Pacific Rise. This animal is devoid of a digestive tract and lives in an intimate symbiosis with a sulfur-oxidizing chemoauto-trophic bacterium. This bacterial endosymbiont is localized in the cells of a richly vascularized organ of the worm: the trophosome.

10p awards 05-04-2013 29 2   Download

Nitric oxide (NO) is a potent intra- and intercellular mes-senger involved in the control of vascular tone, neuronal signallingandhost response to infection. Inmammals,NOis synthesized by oxidation ofL-arginine catalysed by heme-proteins called NO-synthases with intermediate formation of N x -hydroxy-L-arginine (NOHA). NOHA and some hydroxyguanidines have been shown to be able to deliver nitrogen oxides including NO in the presence of various oxidative systems.

9p tumor12 20-04-2013 20 2   Download