The use of elastomer additives to solve the problems in oil well cementing has been investigated in recent years by several research groups in the petroleum industry. This study includes the laboratory examination of the effect of elastomer additives on the physical properties of heavy-weight oil well cement. In the research process, a candidate well is selected and the properties of the cement...

comaring the capability of photocatalyst nano zinc oxide process by two slurry and immobilized methods in dye acid orange 7 removal introduction everyday million liters of color wastewater are produced in different industries and cuases environmental problems. the textile industry significantly affects the environment, producing high volume of wastewater from water and chemicals used in process...

The use of adequate thermal energy storage (TES) systems has shown the potential to increase efficiency in many fields, such as building sector. Shape-stabilized phase change materials (SS-PCMs) have attracted attention address one key barriers (PCMs), leakage during liquid state, that nowadays limits its applicability. However, SS-PCMs still drawbacks overcome, poor fire reaction and stability...

This review summarizes and discusses the analytical methods and techniques described in the literature for hydride generation as a mode of slurry sample introduction into atomization cells. A brief comparison of detection limits for analytical atomic absorption methods and practical applications to analytical samples that utilize slurry hydride generation is discussed. The current state-of-the-...

This paper addresses the estimation of fractional composition of two diastereomers during crystallization. The estimation is obtained through a Partial Least Square (PLS) model that utilizes on-line Raman spectroscopy and additional process information such as temperature and slurry density. Several PLS models are developed that incorporate conditions that either neglect or account for variabil...

CP titanium was polished with a colloidal sitica suspension and chromic ox{de slurry under low and high pressures. The polisheti surfaces wer'e characterized by means of EI]MA and XPS. Irrespeetive of polishing pressure, colloidal silica suspension suecessfully created a mirror-Iike surface that was clean at EPMA level, However, XPS detected a small amount of silicon on the outermost surface. O...

Particle size distribution and trace element patterns were studied in a full-scale anaerobic digestion plant treating pig slurry. Mass balance was established for major (N, P, K, Ca, Fe, Mg and S) and minor (Al, Cu, Mn and Zn) elements. Most of the elements were conserved through the process but part of the P, Ca, Mg and Mn was deposited as crystals lining the digester. In the dry matter of the...

The aim of the study was to determine the influence of temperature, i.e. 4 and 20 degrees C on the Escherichia coli O157:H7 survival time in a stored cattle slurry in a laboratory model experiment. The results of this investigation indicated that the tested microorganisms underwent a gradual elimination in the cattle slurry, whereas their inactivation rate was clearly dependent on the temperatu...

Prevalence of Salmonella enterica on a Danish pig farm presenting recurrent infections was investigated. A comparison of the pulsed-field gel electrophoresis patterns of fecal isolates from piggeries, waste slurry, and agricultural soil amended with Salmonella-contaminated animal waste (slurry) and subclinical isolates from the same farm (collected in 1996 and later) showed identical patterns, ...

A high pressure oxydesulphurisation technique was investigated to reduce sulphur content, especially at ambient temperature. Prince of Wales coal was chosen for this study. The focus of the study was on the reduction of both pyritic and organic sulphur. The effects of pressure, coal slurry concentration, pH and KOH concentration in a fixed time interval on sulphur removal were studied with a se...