Results 1 to 10 of about 114,947 (108)

INCREASING THE EFFICIENCY OF USING WOOD BIOMASS BY PROVIDING SPECIAL PROPERTIES

open access: yesSiberian Journal of Life Sciences and Agriculture, 2023
Background. The search for ways to use logging waste is a distinct scientific direction, due to the large number of their permanent formation. The importance of such studies is associated with the need to reduce the loss of valuable wood raw materials in
Mikhail A. Zyryanov   +6 more
doaj   +1 more source

The effect of β-cyclodextrin and pH on bifonazole hydrosolubility [PDF]

open access: yesJournal of the Serbian Chemical Society, 2004
The equlibria of bifonazole in saturated water solution within the pH range 4 to 10 [I = 0.1 mol/dm3 (NaCl); 25 ºC] were studied spectrophotometrically. Based on the equlibrium constants determined in a heterogeneous system, the acidity constant (pKa = 5.
Popović Gordana V., Čakar Mira M.
doaj   +1 more source

The acidity of atmospheric particles and clouds [PDF]

open access: yesAtmospheric Chemistry and Physics, 2020
Acidity, defined as pH, is a central component of aqueous chemistry. In the atmosphere, the acidity of condensed phases (aerosol particles, cloud water, and fog droplets) governs the phase partitioning of semivolatile gases such as HNO3, NH3, HCl, and ...
H. O. T. Pye   +24 more
doaj   +1 more source

Coulometric-potentiometric determination of autoprotolysis constant and relative acidity scale of water [PDF]

open access: yesJournal of the Serbian Chemical Society, 2010
The autoprotolysis constant and relative acidity scale of water were determined by applying the coulometric-potentiometric method and a hydrogen/palladium (H2/Pd) generator anode.
Džudović Radmila M.   +1 more
doaj   +1 more source

Controlled release study for captopril by using polymer carboxymethyl cellulose

open access: yesTikrit Journal of Pure Science, 2023
The present study was done to prepare tablet for captopril (CAP) which used in the treatment of hypertension and heart failure. CAP is mainly absorbed from the proximal intestine and to a lesser extent from the stomach.
Reem Ibrahim Mahdi   +2 more
doaj   +1 more source

Proton Availability at the Air/Water Interface [PDF]

open access: yes, 2010
The acidity of the water surface sensed by a colliding gas is determined in experiments in which the protonation of gaseous trimethylamine (TMA) on aqueous microjets is monitored by online electrospray mass spectrometry as a function of the pH of the ...
Colussi, A. J.   +2 more
core   +2 more sources

Influência do grau de substituição e da distribuição de substituintes sobre as propriedades de equilíbrio de carboximetilcelulose em solução aquosa Influence of the degree of substitution and substituent distribution on the equilibrium properties of carboxymethylcellulose in aqueous solution

open access: yesPolímeros, 1999
Amostras de carboximetilcelulose foram preparadas por reação heterogênea de polpa soda/antraquinona obtida de fibras pré-hidrolisadas de bagaço de cana-de-açúcar.
José Cláudio Caraschi   +1 more
doaj   +1 more source

Aromatic nitrations by mixed acid. Slow liquid-liquid reaction regime [PDF]

open access: yes, 1995
Aromatic nitrations by mixed acid have been selected as a specific case of a heterogeneous liquid-liquid reaction. An extensive experimental programme has been followed using adiabatic and heat-flow calorimetry and pilot reactor experiments, supported by
Alos, M.A.   +6 more
core   +3 more sources

Structure and Properties of 1,3-Phenylenediboronic Acid: Combined Experimental and Theoretical Investigations

open access: yesCrystals, 2019
The structure and properties of 1,3-phenylenediboronic acid are reported. Molecular and crystal structures were determined by single crystal as well as by powder X-ray diffraction methods.
Agnieszka Adamczyk-Woźniak   +7 more
doaj   +1 more source

A simple reactive-transport model of calcite precipitation in soils and other porous media [PDF]

open access: yes, 2015
Calcite formation in soils and other porous media generally occurs around a localised source of reactants, such as a plant root or soil macro-pore, and the rate depends on the transport of reactants to and from the precipitation zone as well as the ...
Kirk, Guy J. D.   +3 more
core   +1 more source

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