In this study, optimization of autogenous shrinkage and microstructure for Ultra-High Performance Concrete (UHPC) based on appropriate application of porous pumice is addressed. The pumices with different water absorption rates are utilized to replace river sand by 10%, 20% and 30%, and its effe...

Natural materials such as ignimbrites are preferred commonly not only in historical places but also in houses or in different kind of buildings all over the world especially around Ahlat in Bitlis-Turkey. Durability, lightness and good-insulation are the significative properties of these stones....

El Misti is one of active volcanos in Peru, and known because it is located close to an important city of Arequipa, at about 17 km. There has been in the past several eruptions and the volcano is covered with lava, ash, etc. from such eruptions. The edifice is composed of a stratotocone called M...

The present investigation on compressive deformation behaviour of aluminium sections filled with Pumice Stone (PS) has been studied. The load-displacement and energy absorption has been recorded. With the growing demand of infrastructure and structural engineering there has been always a need fo...

Pumice stone is a natural, low-cost, available adsorbent. This study aimed to investigate the efficacy of modified pumice with five different acids (acetic acid, hydrochloric acid, phosphoric acid, sulfuric acid, and nitric acid) for the removal of humic acid (HA) from aqueous solutions. Four va...

Small-scale and mid-scale experiments were conducted in order to evaluate pumice stones as a potential enhancement for in-situ burning (ISB). Four oil types, several emulsification degrees of one crude oil were studied. In general, it was observed that the pumice stones did not improve the burni...

In this communication, a single slope basin type solar still is investigated for the climatic conditions of Aligarh (27.89° N, 78.08° E), India. The solar still was tested for the change in the amount of energy storage material (pumice stones) for a constant amount of water (10 L) in the basin...

The standard mole enthalpy of formation is an essential feature of chemical compounds, which is critical for assessing the thermal effects of chemical reactions with their participation. In this paper, two pure phases of zinc borates, 2ZnO•2B2O3•3H2O and ZnB4O7, have been synthesized by hydrothe...

This work presents an alternative route to remove sulphate ions from aqueous solutions, which is simple and fast, and its efficiency of sulphate removal is slightly influenced by temperature (26 °C–70 °C) and pH (4–12). The lowest residual sulphate concentration was about 60 mg L−1, which wa...

A comparative study was performed on the effect of calcium on native and chemically modified forms of mesophilic and thermophilic α-amylases. Circular dichroism (CD) and irreversible thermoinactivation studies were carried out in the absence and presence of 10 mM calcium. From the CD experiment...

Thermodynamic analysis of calcium ions binding to human growth hormone (hGH) was done at 27 °C in NaCl solution, 50 mM, using different techniques. The binding isotherm for hGH-Ca2+ was obtained by two techniques of ionmetry, using a Ca2+-selective membrane electrode, and isothermal titration c...

Two new metal-organic frameworks (MOFs) have been synthesized under different hydrothermal conditions and characterized by single-crystal X-ray diffraction, infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and elemental analysis. Compound 1, crystallized in space g...

The addition of yttrium chloride (YCl3) to an activated carbon-supported Au catalyst (Au/AC) can markedly promote the catalytic performance of acetylene hydrochlorination to the vinyl chloride monomer (VCM). The structure and physicochemical features of the YCl3-modified catalysts (Y–Au/AC) wer...

The effect of 2-oleyl-1-oleylamidoethyl imidazoline ammonium methylsulfate (ODD) and halide ions on corrosion inhibition of mild steel in HCl solution has been studied by experimental and molecular dynamics simulation methods. Synergistic effects were observed between ODD and the halides, and th...

The adsorption properties of surfactant mixtures containing two types of quaternary derivatives of lysosomotropic substances: alkyl N,N-dimethylalaninates methobromides and alkyl N,N-dimethylglycinates methobromides were studied. Quantitative and qualitative description of the adsorption process...

The inhibition effects of sodium dodecylbenzenesulphonate (SDBS) and hexamethylenetetramine (HA) on the corrosion of mild steel in sulphuric acid solution have been studied using weight loss, electrochemical impedance and Tafel polarisation measurements. For HA, a monotonous increase in inhibiti...

Here, we report on the simultaneous direct HPLC diastereo- and enantioseparation of 3-methylcyclohexanone thiosemicarbazone (3-MCET) on a polysaccharide-based chiral stationary phase under normal-phase conditions. The optimized chromatographic system was employed in dynamic HPLC experiments (DHP...

Lipase-catalyzed enantioface-selective protonation of the enol acetate of 2-methylcyclohexanone was performed by using Burkholderia cepacia lipase immobilized on porous ceramic particles, `Lipase PS-C II' (Amano Enzyme Inc.), in i-Pr2O and ethanol, giving (R)-2-methylcyclohexanone with 77% ...

The anodic oxidation of 2- and 3-methylcyclohexanones yields different lactones as oxidation products. A logical reaction route is given in which formation of some lactones are explained by rearrangement of the carbocationic ions formed.

Methylcyclohexanone exists primarily in its most stable chair form at ambient temperatures. Two chair conformers exist in which the methyl group may be either axially or equatorially oriented. The conformational energy difference between these is dominated by non-bonded interactions. Several the...