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Jun 09, 2016 1 Introduction. Nitrogen N and phosphorus P are generally considered as the two most essential and growthlimiting elements in terrestrial ecosystems Elser et al., 2007.In the past few decades, emissions of anthropogenic reactive N and P have been enhanced greatly by growth of global population, industrialization, and agricultural intensification.
The targets of the study were, in terms of the phosphorus-charging route, iron ore, reclaimed scrap, limestone, coals including coke, and chemicals used in surface treatments given in working processes. In the coke making process, all the phosphorus present in the raw coal was assumed to remain in the coke produced. Among the
between genotype and environment may cause the plant to vary in its response to nutrient deficiency. Some general studies on the symptoms of phosphorus deficiency were carried out by Wallace 1951 and effects of phosphorus deficiency on the growth of individual species have been described by Eckerson 1931, Eaton 1949, 1950, 1952,
Jun 25, 2019 Characterizing the mechanisms driving spatial and temporal changes in the stoichiometry of nutrient supply is crucial to understand the controls of an ecosystems carrying capacity and productivity. In marine oligotrophic regions, small changes in the ocean and atmospheric nutrient input ratio can shift the nature of the limiting nutrient.
Background Higher levels of serum phosphorus and the calcium-phosphorus product are associated with increased mortality from cardiovascular disease CVD in patients with chronic kidney disease CKD or prior CVD. However, it is unknown if serum phosphorus levels influence vascular risk in individuals without CKD or CVD. Methods We prospectively evaluated 3368 Framingham Offspring study ...
Jan 10, 2009 Coal is the primary fuel for producing Electricity. Some of the characteristics of coal have profound influence on the day to day working and economics of the power plant. This article discusses Calorific Value and Moisture. Calorific value is the most important parameter that determines the economics of the power plant operation. It indicates the amount of heat that is released when the coal ...
The Calcium, Phosphorus, and Nitrogen Content of Grasses and Legumes and the Relation of these Elements in the Plant 1. Harley A. Daniel. Assistant Agronomist. The writer wishes to express his appreciation to Dr. H. J. Harper for suggestions and criticisms received in the preparation of this paper to B. F. Kiltz and other members of the ...
From the more than 60,000 coal samples in the File, 5,426 were identified as containing data on heat value and the ultimate analysis 6 needed for developing the relationship between carbon and heat content of the coal, that is, the carbon dioxide emission factors. Coal rank was assigned to each sample according to the standard classification ...
Study of the relationship between the free water fraction in dried Candida utilis and the phosphorus content of cells. Article in Russian Nikitin VA, Shkidchenko AN. The relationship between the free water fraction and the phosphate content in lyophilized yeast cells of Candida utilis was studied.
The carbon cycle. The carbon cycle is most easily studied as two interconnected subcycles One dealing with rapid carbon exchange among living organisms. One dealing with long-term cycling of carbon through geologic processes. Although we will look at them separately, its important to realize these cycles are linked.
The loss of sediments and nutrients from land surfaces to surface water supplies continues to be an important source of nonpoint source pollution. The close relationship between loadings of suspended solids and total phosphorus has been reported in many studies. This study was initiated to develop an empirical relationship between phosphorus and suspended solid
Mar 25, 2019 Abstract. In coal, phosphorus can occur in a variety of minerals but apatite Ca5 PO43 OH, F, Cl is the most common. This mineral is often observed within the cell-lumens 20 microns of inertinite macerals, although fracture-infilling apatite has been reported. Its size and main occurrence within the cell lumens makes it difficult to liberate the apatite by current coal
In coal, phosphorus can occur in a variety of minerals but apatite Ca5PO43 OH, F, Cl is the most common. This mineral is often observed within the cell-lumens 20 microns of inertinite ...
Established methods for the determination of phosphorus in coal and coke were compared and found to give results in satisfactory agreement. The method for the determination of phosphorus described in BS 1016, Methods for the analysis and testing of coal and coke, Part 9, 1977 was used to study the relation between the phosphorus content of coals and their
Apr 01, 1981 The method for the determination of phosphorus described in BS 1016, Methods for the analysis and testing of coal and coke, Part 9, 1977 was used to study the relation between the phosphorus content of coals and their corresponding cokes. The cokes were prepared on laboratory, test oven and industrial scales, by the carbonization of various bituminous coals
of coal mining and soil erosion. The cracks induced by mining subsidence destroy the soil structure, exacerbate water evapotranspiration, cause severe mechanical damage to plant roots, and cause the ecological environment to become more fragile 2. Numerous interactions between living organisms and nonliving matter are supported by the
Oct 10, 2018 In the previous study 19 a global phosphorus-flow model was developed that focused on added phosphorus assuming steady-state surface pools, critical phosphorus concentrations of 50100 mg per ...
Total phosphorus intake was not significantly higher in daily cola consumers than in nonconsumers however, the calcium-to-phosphorus ratios were lower. Conclusions ... In one study, cola was given to ... Relationship between carbonated and other low nutrient dense beverages and bone mineral content of adolescents.
Mortality from COPD in relation to coal mining. Various studies have analysed mortality from COPD in relation to coal mining. Liddell examined the death certificates of men aged 2064 who died in Britain during 1961, and whose last occupation was recorded on the certificate as coal mining or work with the National Coal Board NCB, or who were identified as having worked in the coal
Jul 23, 2010 Calcium as a nutrient is most commonly associated with the formation and metabolism of bone. Over 99 percent of total body calcium is found as calcium hydroxyapatite Ca10PO46OH2 in bones and teeth, where it provides hard tissue with its strength. Calcium in the circulatory system, extracellular fluid, muscle, and other tissues is critical for mediating
Thorax1951, 6, 43. A RADIOLOGICAL STUDY OF THE RELATIONSHIP BETWEEN TUBERCULOSIS AND PNEUMOKONIOSIS IN COAL MINERS BY K. J. MANN Fromthe PneumokQniosisResearch UnitSouth Wales of the MedicalResearch Council RECEIVED FOR PUBLICATION DECEMBER 4, 1950 The purpose of this investigation was to study the relationship between
Feb 12, 2020 Besides, the average effective consolidation distance increases from 21 mm to 29.4 mm, with an increase of 40. Furthermore, under the original coal stress of 10 MPa, the relationship between the experimental value of permeation radius of the new material and the theoretical value of radius of the plastic softening zone is also explored.
Mar 31, 2019 The coal permeability is known to be influenced by the pore pressure and effective stress in coal mines. In this study, the characteristics of the bituminous coal permeability response to the pore pressure and effective shear stress in the Xutuan coal mine in Huaibei Coalfield in China were investigated under different stress conditions. For this purpose, gas
Apr 17, 2018 Abstract. Plant nitrogen N and phosphorus P content regulate productivity and carbon C sequestration in terrestrial ecosystems. Estimates of the allocation of N and P content in plant tissues and the relationship between nutrient content and photosynthetic capacity are critical to predicting future ecosystem C sequestration under global change.
Feb 04, 2020 Hence, the present study investigated the diversity and potential functions of bacterial communities in post-coal-mining reclamation soils of three purposefully selected active coal mines located ...
articleosti5382422, title Use of electrical resistivity methods for the study of coal seams in parts of Raniganj coalfield India, author Verma, R K, abstractNote The surface resistivity method has been used to study a few exposed coal seams in the northwestern part of the Raniganj coalfield. Different electrode configurations, viz., Wenner, two-electrode and half
Jan 12, 2021 Now, phosphorus show similar properties as carbon due to its almost similar electronegativity Electronegativity of carbon 2.544 andElectronegativity of... horus 2.253 Along with this, similiar properties of phosphorus with carbonare - 1.
Sulfur content values of coal are considered low, medium, or high in relation to the potential of the coal, when burned, to produce sulfur dioxide emissions below, near, or above increments allowed by the U.S. Environmental Protection Agency under the Clean Air Act, New Source Performance Standards for fossil-fueled boilers.
Jan 29, 2020 Coking vs. Steam Coking coal, also known as metallurgical coal, has low sulfur and phosphorus content and can withstand high heat.Coking coal is fed into ovens and subjected to oxygen-free pyrolysis, a process that heats the coal to approximately 1,100 degrees Celsius, melting it and driving off any volatile compounds and impurities to leave pure carbon.
Jan 01, 1982 Kornfeldt Nitrogen and phosphorus in maoroalgae Botanica Marina Vol. XXV, pp. 197-201,1982 Relation Between Nitrogen and Phosphorus Content of Macroalgae and the Waters of Northern resund Ruth-Aimee Kornfeldt Depf. of Marine Botany, University ofLund, Box 740, S-22007Lund, Sweden Received November 24, 1981January 6,1982 Abstract The seasonal fluctuations in the nitrogen and phosphorus ...
Feb 01, 2015 Based on substantial experience with coals with a range of chlorine content, from 0.1 to over 0.3 Cl, there is not a direct relationship between chlorine content and the extent of boiler corrosion.
May 26, 2019 The Economic Relationship Between Natural Gas and Coal. Wholesale electricity prices depend on the usage of coal and natural gas for generation of electricity. The changing use also has implications for the production, transport, and storage of the two resources. According to research from North Carolina State University and the University of ...
Mar 29, 2021 This study investigated the wettability of tectonic soft coal by analyzing the relationship between proximate analysis indexes, oxygen-containing functional groups, pore characteristics, hardness, gas adsorption capacity, and contact angles. Results show that coal was more hydrophilic with the increase of gas adsorption capacity, moisture content, ash content, and the content
To examine the relationship between dietary phosphorus intakefrom both organic and inorganic sourcesand serum phosphorus concentration in a large cohort of healthy subjects and subjects with reduced kidney function. ... In regards to the phosphorus content of the food supply, ... Pizzorno L. Canaries in the phosphate-toxicity coal mines.
Relationships were investigated between the Calorific Value CV of coal and inorganic sulphur content, 57 Fe M ssbauer absorption, and ratio of pyrite FeS 2 to FeSO 4. Twenty-eight samples of the five different types of coal had CVs ranging from 32,403 to 16,100 kJkg and sulphur concentrations ranging from 0.28 to 2.5 percent.