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Wyświetlanie 1-10 z 111
Tytuł:
The Effect of Detonator Shell Materials on Detonation Calorimetry Results
Autorzy:
Němec, Ondřej
Musil, Tomáš
Künzel, Martin
Powiązania:
https://bibliotekanauki.pl/articles/1062738.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
detonation calorimetry
detonator
PETN
heat of detonation
bomb calorimetry
Opis:
Detonation calorimetry is a method for the determination of the heat released by the detonation of an explosive charge. Compared to classical combustion calorimetry, detonation calorimetry requires an inert atmosphere, a large sample mass and a detonator for its initiation. This detonator releases some energy for which the results must be corrected. Four types of detonator have been tested in the calorimeter alone and also in combination with explosive charges of PETN. It was found that the aluminium shell of the detonator considerably increases the apparent heat of detonation of the PETN samples in a vacuum, while the presence of combustible (polymeric) components has the opposite effect. Pressurization of the calorimetric vessel with nitrogen gas only partially suppresses these effects. The preferred technique is to use copper or glass confinement in a high pressure inert atmosphere.
Źródło:
Central European Journal of Energetic Materials; 2020, 17, 4; 552-565
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inhibition study of adenosine deaminase by caffeine using spectroscopy and isothermal titration calorimetry.
Autorzy:
Saboury, A
Divsalar, A
Ataie, G
Amanlou, M
Moosavi-Movahedi, A
Hakimelahi, G
Powiązania:
https://bibliotekanauki.pl/articles/1043464.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
calorimetry
inhibition
caffeine
adenosine deaminase
Opis:
Kinetic and thermodynamic studies were made on the effect of caffeine on the activity of adenosine deaminase in 50 mM sodium phosphate buffer, pH 7.5, using UV spectrophotometry and isothermal titration calorimetry (ITC). An uncompetitive inhibition was observed for caffeine. A graphical fitting method was used for determination of binding constant and enthalpy of inhibitor binding by using isothermal titration microcalorimetry data. The dissociation-binding constant is equal to 350 μM by the microcalorimetry method, which agrees well with the value of 342 μM for the inhibition constant that was obtained from the spectroscopy method. Positive dependence of caffeine binding on temperature indicates a hydrophobic interaction.
Źródło:
Acta Biochimica Polonica; 2003, 50, 3; 849-855
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie wyników ciepła hydratacji metodą semiadiabatyczną i metodą izotermiczną oraz wyznaczenie współczynnika korelacji
Establishing of the correlation coefficient between results of heat of hydration semi-adiabatic and isothermal method
Autorzy:
Baran, T.
Francuz, P.
Duszak, B.
Pichniarczyk, P.
Hernik, K.
Powiązania:
https://bibliotekanauki.pl/articles/391886.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
Tematy:
cement
ciepło hydratacji
kalorymetria
kalorymetria semiadiabatyczna
kalorymetria izotermiczna
porównanie
współczynnik korelacji
hydration heat
calorimetry
semi-adiabatic calorimetry
isothermal calorimetry
comparison
correlation coefficient
Opis:
Podstawowym celem pracy była próba określenia współczynnika korelacji pomiędzy wynikami badań ciepła hydratacji cementów wykonanych metodą izotermiczną i metodą semiadiabatyczną według PN-EN 196-9. Należy zaznaczyć, że taka korelacja istnieje dla wyniku badania ciepła hydratacji po 41 godzinach metodą semiadiabatyczną według PN-EN 196-9 i wyniku badania po 168 godzinach metodą rozpuszczania według PN-EN 196-8. Badania porównawcze ciepła hydratacji metodą izotermiczną i semiadiabatyczną według PN-EN 196-9 oraz próba określenia współczynnika korelacji pomiędzy tymi metodami prowadzono na wybranych cementach przemysłowych, zróżnicowanych z uwagi na rodzaj i ilość dodatku do cementu oraz stopień rozdrobnienia cementu. Współczynniki korelacji pomiędzy metodą semiadiabatyczną i izotermiczną obliczono i wyrażono jako stosunek ilości wydzielonego ciepła z kalorymetru semiadiabatycznego do ilości wydzielonego ciepła z kalorymetru izotermicznego, dla danego rodzaju cementu i dla danego okresu hydratacji. Porównując współczynniki korelacji badanych cementów, należy podkreślić ich zróżnicowanie dla poszczególnych rodzajów cementów. Wielkość współczynnika korelacji dla cementów portlandzkich CEM I i cementów portlandzkich wieloskładnikowych CEM II maleje z czasem hydratacji. W przypadku cementu hutniczego CEM III obserwujemy wzrost wielkości współczynnika korelacji w przedziale czasowym ok. 24–48 godzin.
The main goal of this work was the determination of the correlation coefficient, between results of the heat of hydration measurements carried out using isothermal method and semi-adiabatic method according to PN-EN 196-9. It should be underlined, that that correlation exists for results of heat of hydration after 41 hours semi-adiabatic method according to PN-EN 196-9 and solution method after 168 hours according to PN-EN 196-8. The comparative studies of heat of hydration by isothermal method and semi-adiabatic method according to PN-EN 196-9 and the determination of the correlation coefficient, between these methods, were carried out with using of the selected industrial cements differentiated by their type, the content of cement addition and its degree of fineness. The correlation coefficients between semi-adiabatic and isothermal methods were calculated and expressed as the ratio of the cumulated heat of hydration from semi-adiabatic calorimeter to the cumulated heat of hydration from isothermal calorimeter, for particular cement and hydration period. Comparing the correlation coefficients of studied cements, their differentiation for particular cement types should be underlined. The value of the correlation coefficient for Portland cements CEM I and Portland cements with additions CEM II decreases over the hydration time. However, in the case of blast-furnace cement, the increase of the correlation coefficient value in time interval about 24–48 hours is observed.
Źródło:
Prace Instytutu Ceramiki i Materiałów Budowlanych; 2017, R. 10, nr 29, 29; 7-17
1899-3230
Pojawia się w:
Prace Instytutu Ceramiki i Materiałów Budowlanych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation of Selected Emulsion Phase Parameters in Milk, Cream and Buttermilk
Autorzy:
Brożek, Oskar
Kiełczewska, Katarzyna
Bohdziewicz, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2016033.pdf
Data publikacji:
2022-03-01
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
milk products
size of fat globules
fatty acid profile
differential scanning calorimetry curves
differential scanning calorimetry parameters
Opis:
Milk fat undergoes modification during butter production, which can alter its parameters and suitability for processing. The aim of this study was to compare selected milk fat parameters, including the size of milk fat globules, fatty acid profile and thermal properties, based on the thermal history of milk, cream and sweet buttermilk obtained during continuous churning in butter production. The size of milk fat globules was measured by the laser diffraction method; the fatty acid profile of milk fat was determined by gas chromatography; and the thermal properties of freeze-dried samples were determined by differential scanning calorimetry. The analysed products were arranged in the following descending order based on the size of milk fat globules, expressed by the Sauter mean diameter: cream > raw milk > buttermilk. Buttermilk was characterised by the greatest variations in the size of milk fat globules. A microscopic analysis revealed that an increase in fat content intensified the agglomeration of milk fat globules in cream rela tive to milk. Chains of milk fat globules were observed in buttermilk. Buttermilk was more abundant in monoenoic and polyenoic fatty acids than raw milk and cream. A thermal analysis demonstrated significant ( p≤0.05) differences in the parameters of fat crystallisation and melting peaks between raw milk, buttermilk and cream. The thermal history of the samples influenced the results. Cream was characterised by significantly greater changes in the melting and crystallisation enthalpy of milk fat and significantly higher peak s than milk and buttermilk.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2022, 72, 1; 5-15
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of the Energetic Compounds Aminoguanidinium-, Triaminoguanidiniumand Azidoformamidinium Perchlorate
Autorzy:
Klapötke, T. M.
Stierstorfer, J.
Powiązania:
https://bibliotekanauki.pl/articles/358855.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
perchlorates
energetic salts
calorimetry
X-ray
DSC
Opis:
Aminoguanidinium perchlorate (2, AGClO4) was formed by the reaction of aminoguanidinium bicarbonate (1) with aqueous perchloric acid solution. Triaminoguanidinium perchlorate (3, TAGClO4) was synthesized by nucleophilic attack of aqueous hydrazine solution on aminoguanidinium perchlorate under release of ammonia. The new and highly explosive azidoformamidinium perchlorate (4, AFClO4) was formed by the reaction of aminoguanidinium perchlorate with potassium nitrite under acidic conditions. The structures of the perchlorate salts in the crystalline state were determined using low temperature single crystal X-ray diffraction yielding monoclinic as well as orthorhombic structures. The compounds were characterized comprehensively using vibrational spectroscopy (IR and Raman), multinuclear (1H, 13C and 15N) NMR spectroscopy, elemental analysis and mass spectrometry. The thermal behavior as well as the decompositions were investigated using DSC (differential scanning calorimetry) and the heats of formation were calculated using heats of combustion determined by bomb calorimetric measurements. In addition, the sensitivities were evaluated using BAM methods (drophammer and friction tester), whereby the perchlorate salts are all sensitive towards impact as well as friction.
Źródło:
Central European Journal of Energetic Materials; 2008, 5, 1; 13-30
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of sample preparation and the presence of other active pharmaceutical ingredients (api) and excipients on the use of dsc method in quantification of paracetamol in commercially available tablets
Autorzy:
TALIK, Przemysław
TALIK, Piotr
HUBICKA, Urszula
Powiązania:
https://bibliotekanauki.pl/articles/1033708.pdf
Data publikacji:
2016
Wydawca:
Zakład Opieki Zdrowotnej Ośrodek Umea Shinoda-Kuracejo
Tematy:
"DSC"
"Differential Scanning Calorimetry"
"acetaminophen"
"ibuprofen"
"paracetamol"
Opis:
The direct Differential Scanning Calorimetry method of the determination of paracetamol in commercially available drugs was developed. The method was based on calibration curves obtained from melting enthalpies ΔH of binary mixtures of paracetamol and commonly used excipients such as starch or microcrystalline cellulose in increasing weight ratios. In order to demonstrate how the technological processes of formulating the tablets affects the quantitative studies, the micronized and nonmicronized mixtures were used. The idea of using micronized mixtures was to simulate these technological processes. The appropriate paracetamol contents of the selected pharmaceutical preparations were calculated and compared. The final results demonstrated, that the contents of paracetamol obtained from micronized samples were much closer to those declared by the manufacturer than the nonmicronized. Excluding two drugs, the influence of starch or cellulose on quantification in the micronized group was not observed whereas in the nonmicronized group it was distinctly visible.
Źródło:
Medicina Internacia Revuo; 2016, 27, 107; 100-106
0465-5435
Pojawia się w:
Medicina Internacia Revuo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calorimetric Measurements of Ga-Li System by Direct Reaction Method
Autorzy:
Dębski, A.
Powiązania:
https://bibliotekanauki.pl/articles/350810.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gallium-lithium system
Ga-Li
calorimetry
thermochemistry
Opis:
The direct reaction calorimetric method was used for the determination of the formation enthalpy of alloys which concentrations correspond to the: Ga7Li2, Ga9Li5, GaLi, Ga4Li5, Ga2Li3, and GaLi2 intermetallic phases. The obtained experimental values of the formation enthalpy were: –18.1 ±0.8 kJ/mol at., –26.5 ±0.3 kJ/mol at., –34.7 ±0.3 kJ/mol at., –33.5 ±0.5 kJ/mol at., –32.8 ±0.3 kJ/mol at. and –24.6 ±1.4 kJ/mol at., respectively. After the calorimetric measurements, all the samples were checked by way of X-ray diffraction investigations to confirm the structure of the measured alloys. All the measured values of the formation enthalpy of the Ga-Li alloys were compared with literature data and the data calculated with use of the Miedema model.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 919-926
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermochemical characterization of Ca4La6(SiO4)6(OH)2 a synthetic La- and OH-analogous of britholite: implication for monazite and LREE apatites stability
Autorzy:
Janots, Emilie
Brunet, Fabrice
Goffe, Bruno
Poinssot, Christophe
Burchard, Michael
Cemic, Lado
Powiązania:
https://bibliotekanauki.pl/articles/2086520.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
monazite
britholite
apatite
calorimetry
nuclear waste form
Opis:
In this contribution, monazite (LREEPO4) solubility is addressed in a chemical system involving REE-bearing hydroxylapatite, (Ca,LREE)10(PO4,SiO4)6(OH)2. For this purpose, a synthetic (La)- and (OH)-analogous of britholite, Ca4La6(SiO4)6(OH)2, was synthesised and its thermodynamic properties were measured. Formation enthalpy of –14,618.4 ± 31.0 kJ·mol–1 was obtained by high-temperature drop-solution calorimetry using a Tian-calvet twin calorimeter (Bochum, Germany) at 975 K using lead borate as solvent. Heat capacities (Cp) were measured in the 143–323 K and 341–623 K ranges with an automated Perkin-Elmer DSC 7. For calculations of solubility diagrams at 298 K, the GEMS program was used because it takes into account solid solutions. In conditions representative of those expected in nuclear waste disposal, calculations show that La-monazite is stable from pH = 4 to 9 with a minimum of solubility at pH = 7. La-bearing hydroxylapatite precipitates at pH > 7 with a nearly constant composition of 99% hydroxylapatite and 1% La-britholite. Each mineral buffers solution at extremely low lanthanum concentrations (log{La} = 10–10–10–15 mol·kg–1 for pH = 4 to 13). In terms of chemical durability, both La-monazite and La-rich apatite present low solubility, a requisite property for nuclear-waste forms.
Źródło:
Mineralogia; 2008, 39, 1/2; 41--52
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermochemical characterization of Ca4La6(SiO4)6(OH)2 a synthetic La- and OH-analogous of britholite: implication for monazite and LREE apatites stability
Autorzy:
Janots, E.
Brunet, F.
Goffe, B.
Poinssot, C.
Burchard, M.
Cemic, L.
Powiązania:
https://bibliotekanauki.pl/articles/2086546.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
monazite
britholite
apatite
calorimetry
nuclear waste form
Opis:
In this contribution, monazite (LREEPO4) solubility is addressed in a chemical system involving REE-bearing hydroxylapatite, (Ca,LREE)10(PO4,SiO4)6(OH)2. For this purpose, a synthetic (La)- and (OH)-analogous of britholite, Ca4La6(SiO4)6(OH)2, was synthesised and its thermodynamic properties were measured. Formation enthalpy of –14,618.4 ± 31.0 kJ·mol–1 was obtained by high-temperature drop-solution calorimetry using a Tian-calvet twin calorimeter (Bochum, Germany) at 975 K using lead borate as solvent. Heat capacities (Cp) were measured in the 143–323 K and 341–623 K ranges with an automated Perkin-Elmer DSC 7. For calculations of solubility diagrams at 298 K, the GEMS program was used because it takes into account solid solutions. In conditions representative of those expected in nuclear waste disposal, calculations show that La-monazite is stable from pH = 4 to 9 with a minimum of solubility at pH = 7. La-bearing hydroxylapatite precipitates at pH > 7 with a nearly constant composition of 99% hydroxylapatite and 1% La-britholite. Each mineral buffers solution at extremely low lanthanum concentrations (log{La} = 10–10–10–15 mol·kg–1 for pH = 4 to 13). In terms of chemical durability, both La-monazite and La-rich apatite present low solubility, a requisite property for nuclear-waste forms.
Źródło:
Mineralogia; 2008, 39, 1/2; 41--52
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of thermal analysis and calorimetry for assessment of safety and quality of nitrogen fertilizers
Autorzy:
Poplawski, D.
Kaniewski, M.
Hoffmann, J.
Hoffmann, K.
Powiązania:
https://bibliotekanauki.pl/articles/30147054.pdf
Data publikacji:
2018
Wydawca:
Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Tematy:
ammonium nitrate
fertilizers
safety
quality
calorimetry
thermal analysis
Opis:
The paper presents the results of studies carried out using differential thermal analysis (DTA) and differential scanning calorimetry (DSC), conjugated with thermogravimetry (TG). Measurements were made for samples with differentiated compositions, mainly consisting of ammonium nitrate with fertilizer purity and compounds that may be present in nitrogen fertilizers as potential additives or contaminants. The possibilities of applied techniques and recommendations concerning proper selection of measurement conditions are described. Furthermore, the method of interpretation of the obtained results is presented, which allows evaluating the thermal stability of the tested mixtures for the safety and quality of nitrogen fertilizers.
Źródło:
Scientific Journal of the Military University of Land Forces; 2018, 50, 3(189); 206-217
2544-7122
2545-0719
Pojawia się w:
Scientific Journal of the Military University of Land Forces
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 111

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