نتایج جستجو برای ' Dust '

Over recent years a significant amount of research has been undertaken to develop prognostic models that can be used to predict the remaining useful life of engineering assets. Implementations by industry have only had limited success. By design, models are subject to specific assumptions and approximations, some of which are mathematical, while others relate to practical implementation issues such as the amount of data required to validate and verify a proposed model. Therefore, appropriate mod...

This study describes removal of Cr(VI) ions from aqueous solutions using silver oxide sawdust nanocomposite (Ag2O/SD NC) prepared by chemical precipitation rout. Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) techniques were used for characterization of the prepared NC. The effect of various parameters such as feed concentration, feed flow rate and adsorbent amount on the breakthrough curves (BTC) was investigated. Two well-known column adsorption kinetics models including Thomas...

This paper studies the Indicators To Assesment and Ranking the Financial Performance with The Chemical Manufacturing Listed In Tehran Stock Exchange. We Using the Data Enviornment Analysis and TOPSIS methods. It is an applied research study as far as goals and objectives are concerned. As for the type of research plan, it is ex-post facto since it relies on historical information. This research study includes one major question and four sub-questions. The research society includes the companies ...

 Previously successfully applied polyalkenyl-poly(maleic-anhydride)-ester/amide type additives synthesized in laboratory scale have gone through selection steps then the selected coupling additives were produced in industrial scale process. Additives have been applied for treating the surfaces of glass fibres with and then mechanical properties of the laminated polyester and vinyl–ester based composites have been determined. Results have been focussed on the effect of the size increas...

 Titanium alloy with a low density, high specific strength, corrosion resistance and good process performance, is the ideal structural materials for the aerospace engineering. Based on the microstructure of titanium alloys, it can be divided into α-type titanium alloys (heat-resistant titanium alloys), β-type titanium alloys and α + β-type titanium alloys. The research scopes also include the fabrication technology of titanium alloys, powder metallurgy, rapid...

 Effect of residual stress generated during tube fabrication, roll expansion and machining of stainless steel on the stress corrosion cracking (SCC) susceptibility was studied by testing fabricated tubes, tube–tube sheet joint and heavily machined plate of austenitic stainless steel (SS) in boiling MgCl2. U bend samples of machined plate were exposed to acidified SO4 + Cl− environment at room temperature to study its ambient temperature SCC behavior. The results c...

 Due to the economical and environmental concern, polymer mortar and polymeric composites were prepared by mixing recycled polystyrene waste and cement dust waste as a filler. Virgin polystyrene and portland cement were used for comparison. Cement dust was treated by the reaction with stearic acid to increase the adhesion between the filler and the polymer matrix. The composites were prepared by mixing different concentration of treated and untreated cement dust (30, 50, 70 and 90 wt.%...

The present research explored beliefs about climate change among an important yet relatively understudied population: representatives of the building industry. We also assessed the perceived adequacy of current climate-related actions within the industry and the perceived need for developing new practices. The results of a survey administered within a large engineering firm suggest a fairly high level of concern about climate issues within this sector: participants perceived climate change to be...

  The aims of this work were to quantitatively and qualitatively study culturable fungi and bacteria in the air and settled dust in the storerooms of five Polish libraries and archives as well as to estimate the effect of water intrusion on the microbial air quality indoors. In all studied storerooms, the total bioaerosol concentrations at the workplaces ranged from 100 to 1000 cfu/m3. The most prevalent part of the storerooms’ bioaerosol consisted of bacteria, mainly S...

 The present paper shows the results of a literature survey aimed at exploring how the indoor environment in buildings affects human comfort. The survey was made to gather data that can be useful when new concepts of controlling the indoor environment are developed. The following indoor environmental conditions influencing comfort in the built environment were surveyed: thermal, visual and acoustic, as well as air quality. The literature was surveyed to determine which of these conditions w...