scholarly journals THE STUDY OF INTERACTIONS IN THE SYSTEM OF ”BORIC ACID-UREA” BY THE METHOD OF INFRARED-FURIE SPECTROMETRY

2017 ◽  
Vol 18 (3.1) ◽  
pp. 145-155
Author(s):  
A.L. Lobachev ◽  
I.V. Lobacheva ◽  
E.V. Revinskaya ◽  
N.A. Redkin
Keyword(s):  
Infrared Spectrum ◽  
Boric Acid ◽  
Infrared Spectrometry ◽  
Influence Of Temperature ◽  
Technical Mixture ◽  
The Given ◽  
Duration Of Heating

The possibility of usage of method of infrared spectrometry with Furie transformation for the investigation of the depth of the flow of interactions in the system of ”boric acid-urea” is investigated. It is shown that infrared spectrum reflects even the smallest changes of the structure of the given system very good. The investigation of the influence of temperature, duration of heating, and correlation of components of the technical mixture ”boric acid-urea” on the process of their interaction is carried out.

DETERMINATION OF MICRO-AMOUNTS OF 5β-PREGNAN-3α-OL-20-ONE IN URINE USING INFRARED-SPECTROMETRY

1962 ◽  
Vol 41 (2) ◽  
pp. 234-246 ◽  
Author(s):  
H. J. van der Molen
Keyword(s):  
Infrared Spectrum ◽  
Quantitative Determination ◽  
Acid Hydrolysis ◽  
Chromatographic Separation ◽  
Pure Form ◽  
Infrared Spectrometry ◽  
Hydrolysis Of

ABSTRACT A procedure for the quantitative determination of 5β-pregnan-3α-ol-20-one in urine is described. After acid hydrolysis of the pregnanolone-conjugates in urine, the free steroids are extracted with toluene. Pregnanolone is isolated in a pure form as its acetate; after chromatographic separation of the free steroids on alumina, the fraction containing pregnanolone is acetylated and rechromatographed on alumina. Quantitative determination of the isolated pregnanolone-acetate is carried out with the aid of the infrared spectrum recorded by a micro KBr-wafermethod. The reliability of the method under various conditions is discussed under the headings, specificity, accuracy, precision and sensitivity. It is possible to determine 30–40 μg pregnanolone in a 24-hours urine portion with a precision of 25%.

scholarly journals Infrared Spectrometry Options With ATR Method for Oxidation Evaluation of Oils

2018 ◽  
Vol 13 (2) ◽  
pp. 33-39
Author(s):  
Jan Poledník
Keyword(s):  
Sunflower Oil ◽  
Linseed Oil ◽  
The Self ◽  
Infrared Spectrometry ◽  
Influence Of Temperature

Abstract Theme Article deals with the use of infrared spectrometry (ATR method) to analyze oxidation, because oxidation plays a role in the self-ignition of oils. As samples were used - sunflower oil, linseed oil. Aim experiment to verify that the infrared spectrometry modified by the ATR method is suitable for the evaluation of the oxidation of liquid substances. Verification of the suitability of the method was performed by comparing the data obtained during the measurement of this experiment with the data verified in other publications. Subsequently, the influence of temperature and time on the oxidation assumed was investigated.

scholarly journals Influence of temperature and different hydroxides on properties of activated carbon prepared from saccharose. Characterization, thermal degradation kinetic and dyes removal from water solutions

2018 ◽  
Vol 50 (2) ◽  
pp. 255-273 ◽  
Author(s):  
Sanja Krstic ◽  
Milan Kragovic ◽  
Vladimir Dodevski ◽  
Aleksandar Marinkovic ◽  
Branka Kaludjerovic ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Hydrothermal Treatment ◽  
Infrared Spectrometry ◽  
Degradation Kinetic ◽  
Influence Of Temperature ◽  
X Ray ◽  
Water Solutions ◽  
N2 Atmosphere ◽  
Adsorption Desorption ◽  
Dyes Removal

In presented paper, influence of temperature, precursor concentration and different hydroxides on properties of activated carbon obtained from saccharose were investigated. The samples were prepared by hydrothermal treatment and activated using KOH, NaOH and LiOH. Two saccharose concentrations (0.5, 1.0 mol/dm3) and three temperatures (160, 200, 240 ?C) were changed in hydrothermal treatment. Activation processes were performed at 750?C under N2 atmosphere. Samples were characterized by X-ray powder diffractometry, elemental analysis, N2 adsorption-desorption measurements, Fourier-transform infrared spectrometry, scanning electron microscopy and thermal analysis. The obtained samples were tested for potential application in dyes removal from water solutions.

scholarly journals Application of Infrared Spectrometry in Studying Fuels and Biofules for Aircraft Turbine Engines

2020 ◽  
Vol 50 (2) ◽  
pp. 107-126
Author(s):  
Marzena Łosiewicz
Keyword(s):  
Infrared Spectrum ◽  
Research Paper ◽  
Turbine Engines ◽  
Infrared Spectrometry ◽  
Mineral Fuel ◽  
Hydro Carbon

AbstractThe research paper presents hydrocarbon biocomponents approved for use in aircraft turbine engines. The properties of these biocomponents are governed by ASTM D 7566 standard. One of the new issues regarding the utilization of fuels for aircraft turbine engines is the identification of non-petroleum elements, including hydrocarbon biocom-ponents. This article proposes applying infrared spectrometry as a technique for in-strumental analysis, which enables quick and qualitative identification of a used hydro-carbon biocomponent. Differences in the infrared spectrum between the mineral fuel and used fuel biocomponent were indicated based on the conducted preliminary tests.

scholarly journals Production of facing ceramic material using cullet

2019 ◽  
Vol 91 ◽  
pp. 02003 ◽  
Author(s):  
Anastasiya Kolosova ◽  
Maria Sokolskaya ◽  
Evgeniy Pikalov ◽  
Oleg Selivanov
Keyword(s):  
Boric Acid ◽  
Bending Strength ◽  
Total Porosity ◽  
Liquid Phase Sintering ◽  
Charge Composition ◽  
Vitreous Phase ◽  
Functional Additives ◽  
Rigid Frame ◽  
The One ◽  
The Given

The research presents experimental results concerning the charge composition development for ceramics, used for cladding facades and basements of buildings and structures. The given composition is suggested to be based on the low plasticity clay as a basic component, which cannot be used to produce crackless, durable and frost resistant ceramics without introducing functional additives. The following functional additives were applied in the conducted experiments: boric acid, used as a fuse for the reduction of liquid phase sintering temperature and the increase of vitreous phase amount; various empties cullet, used as a fluxing and strengthening additive, which is the source of vitreous phase, forming the rigid frame of interconnected ceramic particles through a layer of vitreous phase. The research experiments stated that the highest compressive strength and frost resistance and the least water absorption can be achieved when 30 wt. % of colorless empties cullet and 2,5 wt.% of boric acid are introduced into the charge. Besides the research demonstrates the results of determining the dependence of bending strength, density, thermal conductivity, open and total porosity. The developed charge composition on the one hand stipulates the solution environmental and technical-economic problems of natural resources rational use and waste management, and on the other hand allows producing high quality facing ceramic products at a reduced cost and using low demand resources.

The influence of heat and chemical treatment on ruminal disappearance of canola meal

1991 ◽  
Vol 71 (3) ◽  
pp. 773-780 ◽  
Author(s):  
J. J. McKinnon ◽  
J. A. Olubobokun ◽  
D. A. Christensen ◽  
R. D. H. Cohen
Keyword(s):  
Chemical Treatment ◽  
Acid Treatment ◽  
Crude Protein ◽  
Dry Matter ◽  
Canola Meal ◽  
Influence Of Temperature ◽  
Duration Of Heating ◽  
Increased Icp

The influence of temperature (125 or 145 °C) and duration (10, 20 or 30 min) of heating, or chemical treatment (acetic (AA) or formic (FA) acid) on in vitro insoluble DM (IDM) and insoluble CP (ICP) and 12 h in situ ruminal disappearance of canola meal was examined. Ruminal disappearances of dry matter (DDM) and crude protein (CPD) were expressed as apparent (ADMD and ACPD), insoluble (IDMD and ICPD) and degradable (DDMD and DCPD). Insoluble DM content was reduced by AA and FA (P < 0.01), while ICP was reduced by FA (P < 0.01). Acid treatment had no effect on in situ DMD or CPD. Heating increased IDM and ICP (P < 0.01). Duration of heating increased ICP at 145 °C (P < 0.01). Apparent DMD was influenced by temperature (P < 0.01) but not duration of heating. Mean ADMD and ACPD for control, 125 and 145 °C were 57.8, 59.6; 36.8, 24.1; and 27.4%, 13.7%, respectively, (P < 0.01). Insoluble and degradable DMD and CPD were reduced by heating (P < 0.01) but the influence of temperature or duration of heating was not consistent. The results indicate that heating at 125 or 145 °C for 10 min or more will reduce in situ DM and CP disappearance of canola meal, and increase the post-ruminal supply of DM and CP. Key words: Canola meal, in vitro solubility, in situ digestibility, heat and acid treatment

The effect of temperature on high-resolution TEM image contrast

1995 ◽  
Vol 53 ◽  
pp. 640-641
Author(s):  
T. Geipel ◽  
W. Mader ◽  
P. Pirouz
Keyword(s):  
Form Factor ◽  
Inelastic Scattering ◽  
Accurate Method ◽  
Waller Factor ◽  
Effect Of Temperature ◽  
Specimen Thickness ◽  
Influence Of Temperature ◽  
Debye Waller Factor ◽  
Influence Of Temperature On ◽  
Atomic Form Factor

Temperature affects both elastic and inelastic scattering of electrons in a crystal. The Debye-Waller factor, B, describes the influence of temperature on the elastic scattering of electrons, whereas the imaginary part of the (complex) atomic form factor, fc = fr + ifi, describes the influence of temperature on the inelastic scattering of electrons (i.e. absorption). In HRTEM simulations, two possible ways to include absorption are: (i) an approximate method in which absorption is described by a phenomenological constant, μ, i.e. fi; - μfr, with the real part of the atomic form factor, fr, obtained from Hartree-Fock calculations, (ii) a more accurate method in which the absorptive components, fi of the atomic form factor are explicitly calculated. In this contribution, the inclusion of both the Debye-Waller factor and absorption on HRTEM images of a (Oll)-oriented GaAs crystal are presented (using the EMS software.Fig. 1 shows the the amplitudes and phases of the dominant 111 beams as a function of the specimen thickness, t, for the cases when μ = 0 (i.e. no absorption, solid line) and μ = 0.1 (with absorption, dashed line).

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