scholarly journals Methodological aspects of snow cover sampling for chemical analysis

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Natalia I. Ianchenko ◽  
Ekaterina I. Kotova
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Snow Cover ◽  
Sampling Methods ◽  
Rapid Development ◽  
Geographic Location ◽  
Steady Increase ◽  
Scientific Publications ◽  
Methodological Aspects ◽  
Density Methods

Abstract At present there is a steady increase in scientific publications on studying the chemical composition of snow cover. At the same time, there are practically no modern publications on the methods of snow cover sampling for chemical analysis. The rapid development of analytical ways to determine the composition of samples in general justifies the need to improve the methodology of snow cover sampling. Today, researchers use a variety of adapted sampling methods depending on the goal, the geographic location of the study area, and the analyzed component. Each publication contains a rationale for the sampling method used. This article describes the methodology of sampling snow cover to determine its density. Methods of taking snow cover samples to determine its chemical composition most often depend on the chosen practices. The primary systematization of snow cover sampling methods has been carried out. Synthesis of literature reveals some problems, including the need for improved standardized techniques of snow sampling for chemical analysis and for the development of applied instrumentation to address snow geochemistry.

The chemical composition of leucoxene in Cainozoic bauxite from Boolarra, Victoria

1942 ◽  
Vol 26 (179) ◽  
pp. 273-274 ◽  
Author(s):  
A. B. Edwards
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Olivine Basalt ◽  
Pure Sample ◽  
Residual Structure ◽  
Aluminium Titanate

During a petrological examination of samples of bauxite from Boolarra, in south Gippsland, Victoria, it was noted that some specimens of the bauxite, which is largely derived from Tertiary olivine-basalt, contained numerous grains of yellow-brown to amber-yellow leucoxene. The leucoxene is clearly pseudo-morphous after ilmenite, residual particles of ilmenite being enclosed in many of the leucoxene grains. Most of the leucoxene grains are opaque, but occasional grains are translucent to transparent, though isotropic. Some of them show parallel markings suggestive of cleavage, but probably a residual structure from the replaced ilmenite. In view of the highly aluminous nature of the enclosing rock, there seemed some possibility that this mineral might be the little-known aluminium titanate, xanthitane. It was thought, therefore, that if a pure sample of the mineral could be prepared, a chemical analysis would establish its identity.

scholarly journals Elementary chemical analysis in leaves infected by fumagina by X-Ray fluorescence technique

2007 ◽  
Vol 50 (5) ◽  
pp. 851-860 ◽  
Author(s):  
Maria Sélia Blonski ◽  
Carlos Roberto Appoloni ◽  
Paulo Sérgio Parreira ◽  
Pedro Henrique Arruda Aragão ◽  
Virgilio Franco Nascimento Filho
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Fluorescence Technique ◽  
Energy Dispersion ◽  
X Ray ◽  
Set Up ◽  
Elementary Chemical ◽  
Cu And Zn

Energy Dispersion X-Ray Fluorescence Technique (EDXRF) was employed to study the effects of the fumagina disease on the elementary chemical composition of the leaves. The experimental set up consisted of a Mo X-ray tube (Ksub<FONT FACE=Symbol>µ</FONT> = 17.44 keV) with Zr filter and a Si (Li) detector. The measurements were performed with the infected and healthy leaves of citric plants. The elements Ti, Mn, Fe, Cu and Zn were quantified, with an average DL of 69, 12, 8, 4 and 4 µg.g-1 respectively. The obtained concentration for Fe varied from 44 to 192 µg.g-1 in healthy leaves and from 363 to 704 µg.g-1 in infected leaves with fumagina .

scholarly journals Hot metal desulfurization by marble waste and fluorspar

2012 ◽  
Vol 65 (2) ◽  
pp. 233-240 ◽  
Author(s):  
Felipe Nylo de Aguiar ◽  
Felipe Fardin Grillo ◽  
Jorge Alberto Soares Tenório ◽  
José Roberto de Oliveira
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Pig Iron ◽  
Hot Metal ◽  
Industrial Mixture ◽  
Desulfurization Process ◽  
Hot Metal Desulfurization ◽  
Vacuum Sampling ◽  
Marble Waste

The objective of this paper is to present an analysis of the use of residual marble mixtures in the pig iron desulfurization process. The study involved the use of: marble waste, fluorspar, lime, and hot metal. Four mixtures were made and added to a liquid hot metal - with known chemical composition - at a temperature of 1450ºC. The mass of each element was calculated from its chemical analysis and compared with an industrial mixture. All of the four mixtures used in the experiments were stirred by a mechanical stirrer. Samples were collected by vacuum sampling for times of 5, 10, 15, 20, and 30 minutes, and analysis was performed to check sulfur variation in the bath with time. The results were analyzed and they verified that it was possible to use marble waste as a desulfurizer.

scholarly journals Effect of Nickel Equivalent on Austenite Transition Ratio in Ni-Mn-Cu Cast Iron

2013 ◽  
Vol 13 (2) ◽  
pp. 53-58 ◽  
Author(s):  
A. Janus ◽  
A. Kurzawa
Keyword(s):  
Cast Iron ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Wall Thickness ◽  
Brinell Hardness ◽  
Austenite Decomposition ◽  
Structural Components ◽  
Microscopy Image ◽  
Image Analyser ◽  
Nickel Equivalent

Abstract Determined was quantitative effect of nickel equivalent value on austenite decomposition degree during cooling-down castings of Ni-Mn- Cu cast iron. Chemical composition of the alloy was 1.8 to 5.0 % C, 1.3 to 3.0 % Si, 3.1 to 7.7 % Ni, 0.4 to 6.3 % Mn, 0.1 to 4.9 % Cu, 0.14 to 0.16 % P and 0.03 to 0.04 % S. Analysed were castings with representative wall thickness 10, 15 and 20 mm. Scope of the examination comprised chemical analysis (including WDS), microscopic observations (optical and scanning microscopy, image analyser), as well as Brinell hardness and HV microhardness measurements of structural components.

scholarly journals Analysis on the Share Price and Forecasting Calculation Data of Activision Blizzard, Inc. Based on SWOT-Model

2020 ◽  
Vol 214 ◽  
pp. 02015
Author(s):  
Jiahao Zhang
Keyword(s):  
Video Game ◽  
Rapid Development ◽  
Advanced Technology ◽  
Share Price ◽  
Steady Increase ◽  
Online Game ◽  
Calculation Data ◽  
Good Investment ◽  
The Future ◽  
Game Industry

In recent years, increasingly advanced technology infrastructure leads to an extraordinary growth of Internet users. By virtue of the explosive growth of the entire Internet industry, the online game industry has shown a rapid development trend, and the overall user scale of online games continues to expand. Meanwhile, the online game industry becomes a good investment market for investors to operate in. This article uses Blizzard as an example to analyze its investment value. Besides, the future trend of the video game industry is analyzed by using the SWOT-model and forecasting calculation data. The result shows that based on the current development of the game industry environment and the same companies in the game industry, Activision Blizzard will have a steady increase in profits in the future. Therefore, it is worth being invested.

scholarly journals Failure Analysis of fractured Fixing Bolts of a Mobile Elevating Work Platform using Finite Element Methods

2019 ◽  
Author(s):  
DongHoon Choi ◽  
Jae-Hoon Kim
Keyword(s):  
Finite Element ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Failure Analysis ◽  
Visual Inspection ◽  
Standard Procedure ◽  
Fatigue Analysis ◽  
Certification Authority ◽  
Element Analysis ◽  
Safety Certification

Mobile elevating work platforms (MEWPs) consist of a work platform, extending structure, and chassis, and are used to move persons to working positions. MEWPs are useful but are composed of pieces of equipment, and accidents do occur owing to equipment defects. Among these defects, accidents caused by the fracture of bolts fixed to the extension structure and swing system are increasing. This paper presents a failure analysis of the fixing bolts of MEWP. Standard procedure for failure analysis was employed in this investigation. Visual inspection, chemical analysis, tensile strength measurement, and finite element analysis (FEA) were used to analyze the failure of the fixing bolts. Using this failure analysis approach, we found the root cause of failure and proposed a means for solving this type of failure in the future. First, the chemical composition of the fixing bolt is obtained by a spectroscopy chemical analysis method, which determined that the chemical composition matched the required standard. The tensile test showed that the tensile and yield strengths were within the required capacity. The stress analysis was carried out at five different boom angles, and it was determined that the fixing bolt of MEWP can withstand the loads at all the boom angles. The outcomes of the fatigue analysis revealed that the fixing bolt fails before reaching the design requirements. The results of the fatigue analysis showed primarily that the failure of the fixing bolt was due to fatigue. A visual inspection of the fractured section of the fixing bolt also confirmed the fatigue failure. We propose a method to prevent failure of the fixing bolt of the MEWP from four different standpoints: the manufacturer, safety certification authority, safety inspection agency, and owner.

scholarly journals ANALISIS BEBERAPA UNSUR KIMIA KOMPOS Azolla mycrophylla

2018 ◽  
Vol 14 (2) ◽  
pp. 60-5
Author(s):  
Sri Utami Lestari ◽  
Muryanto Muryanto
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Rainy Season ◽  
Nutrient Content ◽  
N Fertilizer ◽  
High Nitrogen ◽  
Leaf Part

The most consumed part of the plants is the leaf part so that the fertilizer provided should contain high nitrogen (N). The nature of the N fertilizer is volatile and when the rainy season there can be washing.  When plants deficienci nutrients shows symtoms of yellowing leaves so that the application of N fertilizer to the plant must remain unfulfilled.  Azolla is a usable alternative.  Azolla has a high N nutrient content because it is symbiotic with anabaena in binding to free nitrogen in the air.             The purpose of this study was to determine the chemical composition (pH,N,P,K) Azolla mycrophylla.  The experiment was conducted experimentally with the first stage of composting azolla after it was done chemical analysis in the laboratory.  The result of this research can be concluded that chemical analysis of Azolla mycrophylla cpmpost is as follows :pH 7,17, N 2,57%, P 0,34%, K 0,03%.  

scholarly journals ECOGEOCHEMICAL DIAGNOSTICS CONDITION OF URBAN ENVIRONMENT ON POLLUTION SNOW COVER OF VORONEZH CITY

2015 ◽  
Vol 4 (4) ◽  
pp. 121-126
Author(s):  
Tatiana Ivanovna Prozhorina ◽  
Semyon Aleksandrovitch Kurolap ◽  
Nadezhda Ivanovna Yakunina
Keyword(s):  
Comparative Analysis ◽  
Chemical Composition ◽  
Snow Cover ◽  
Urban Environment ◽  
Chemical Elements ◽  
Rapid Assessment ◽  
High Sorption ◽  
Express Methods ◽  
Functional Areas ◽  
The City

Currently, the most popular are the express methods of quality control of the environment, which permit a relatively rapid assessment of ecological and geochemical situation. one such method is based on the use snow cover. snow has a high sorption capacity and is informative in identifying the object of man-made pollution of the urban environment. the paper presents the results of a study of the chemical composition of snow that had fallen in Voronezh during winter 2015. snow samples were taken in the period prior to snowmelt in various functional areas of the city. in order to identify the degree of technogenic impact on the various parts of the city of Voronezh, was made a comparative analysis of the results:аccording to the actual presence of pollutants in precipitation for the study of functional areas;сalculate the rate on the concentration of chemical elements for test samples of snow.according to the degree of mineralization and dust content in snow can be seen technogenic pressure on environment.therefore, a comparative analysis of the degree of contamination of snow in the various functional areas of the city were carried out for the two indicators of the chemical composition - the total mineralization and suspended particles(dust).the results of the analysis of the chemical composition of the melt water indicate an increased level of technogenic pollution of snow cover in all investigated functional areas of Voronezh.

scholarly journals Chemical composition and insecticidal activity of Garcinia gardneriana (Planchon & Triana) Zappi (Clusiaceae) essential oil

2021 ◽  
Vol 20 (5) ◽  
pp. 503-514
Author(s):  
Carla Maria Mariano Fernandez ◽  
◽  
Fabiana Brusco Lorenzetti ◽  
Sirlene Adriana Kleinubing ◽  
Joao Paulo Pinguello de Andrade ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Essential Oil ◽  
Immersion Test ◽  
Acaricidal Activity ◽  
Gas Chromatography Mass Spectrometry ◽  
Larvicidal Effect ◽  
Sesquiterpene Hydrocarbons

The present study aimed to analyze the chemical composition of the essential oil from Garcinia gardneriana (Planchon & Triana) Zappi leaves and fruits, and to determine its acaricidal activity on Rhipicephalus microplus by larval packet test and larvicidal action on Aedes aegypti by larval immersion test. The chemical analysis of the essential oil by gas chromatography-mass spectrometry identified sesquiterpene hydrocarbons and oxygenated sesquiterpenes in bacupari leaves and fruits, and α-cedrene, α-chamigrene, α-trans-bergamotene, and β-curcumene as major compounds. Essential oil from leaves of G. gardneriana presented acaricidal activity on R. microplus (LC50 = 4.8 mg/mL; LC99 = 10.8 mg/mL) and larvicidal effect on A. aegypti (LC50 = 5.4 mg/mL; LC99 = 11.6 mg/mL), whereas essential oil from the fruits of G. gardneriana showed LC50 = 4.6 mg/mL and LC99 = 8.9 mg/mL against R. microplus and LC50 = 6.4 mg/mL and LC99 = 13.9 mg/mL against A. aegypti. These results thus demonstrate the potential acaricidal and larvicidal activity of essential oil of G. gardneriana, offering new perspectives for the realization of bioassays from this essential oil.

Nouvelles observations sur les roches vertes de l'anticlinal de Laniscat-Merleac (Cotes-du-Nord)

1963 ◽  
Vol S7-V (5) ◽  
pp. 844-851 ◽  
Author(s):  
Jean Nicolas ◽  
Jean Paul Sagon
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Rock Sample ◽  
Coarse Grained ◽  
Northern Flank ◽  
Fine Grained ◽  
Rock Supports

Abstract Observations on the dolerites of the northern flank of the E-W-trending Laniscat-Merleac anticline in NW France suggest that the rocks were emplaced as coulees. A well-marked granular differentiation in the rock supports this hypothesis; the coarse-grained rocks are in contact with Devonian rocks at the bottom of the coulee and the fine-grained rocks are in contact with Dinantian rocks at the top. Chemical analysis shows that there is a diminishing of Na &lt;sub&gt;2&lt;/sub&gt; O and an augmentation of the percentage of CaO ranging from the boundary of the coarse-grained rock to that of the fine-grained. Overlying the green rocks are green schists of comparable chemical composition attributed to former tuffs which were subject to regional epimetamorphism. Finally, a coarse-grained, green rock sample has been traced to the spilite family.

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