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Volume 5, Year 2014, Issue 1, January-March

The transient process of flexographic printing with parallelink supply
Author:
M. Lutskiv, G. Petriashvili, S. Sychak
Downloads:
28 x
 

Abstract: The problem of modeling and transient analysis of flexographic printer’s ink system with parallel ink feeding into the form is enlightened. Printing material has been singled out.

Area: Mechanics, Automation and Robotics

Mass spectrometry as a useful tool for identifying new therapeutic targets on the cell surface of pathogenic fungi from the genus Candida
Author:
Justyna Karkowska-Kuleta, Oliwia Bocheńska
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24 x
 

Abstract: Mass spectrometry (MS) is a universal technique with a wide range of applications, including proteomic studies of different organisms, particularly the characterization and sequencing of proteins isolated from specific cellular compartments. It is used for the identification of elements exposed on the cell surface of microbial pathogens, which are involved in the initial contact with the human host, and then in the further development of infection. Given the increasing frequency of invasive fungal infections caused by pathogenic yeast from the genus Candida, especially among patients with severe immunological impairments, it appears advisable to study the diversity of cell wall proteins that arise during subsequent stages of infection and that are responsible for several important phenomena correlated with pathogenesis. This study employed a liquid chromatograph-coupled mass spectrometer equipped with an electrospray ionization source (ESI), and an ion trap analyser. For tandem mass spectrometry, two approaches for fragmentation of ions - collision-induced dissociation (CID) and electron transfer dissociation (ETD) - were used to analyse the mixtures of peptides generated after tryptic digestion of fungal cell wall proteins (i.e. the “bottom-up” approach). Several surface proteins from Candida spp. were identified which could be potential drug targets and candidates for vaccine development.

Key words: proteomics, pathogenic fungi, candidiasis, mass spectrometry

Area: Chemistry and Pharmacy

Selective chromium III/VI separation in polymer inclusion membrane system
Author:
J. Rajewski1, P. Religa, M. Wojasiński, P. Gierycz
Downloads:
16 x
 

Abstract: Analyze of chromium(III) transport process from mixtures of Cr(III)/Cr(VI) ions with polymer inclusion membrane (PIM) system have been done. Di(2-ethylhexyl) phosphoric acid (D2EHPA) have been used as a carrier. It was found that the transport efficiency in PIM is dependent on the carrier concentration in the membrane. It was found that there is an optimal range of carrier concentration in the membrane, which ensures rapid and efficient transport. In studied system optimal D2EHPA concentration was in range between 0,9- 1,5 mol/dm3. Membrane worked as selective barrier for Cr(VI) ions. However increase of Cr(VI) concentration above 0,0005 mol/dm3 negatively influenced Cr(III) transport. It was caused by degradation of the polymer inclusion membrane made of cellulose triacetate (CTA) . Strongly oxidizing Cr(VI) ions can damage polymer inclusion membrane with CTA matrix. The chemical attack of strongly oxidant Cr(VI) ions could lead either to hydrolysis of the pendant acetyl group or to oxidation of polymer backbone leading to chain scission. Moreover, oxidation is accelerated at high concentration of Cr(VI) ions. The membrane containing D2EHPA as a carrier can be recommended for selective separation of Cr(III) ions only from diluted Cr(VI)/Cr(III) mixtures. However the polymer inclusion membrane need a change the polymer matrix.

Keywords: chromium separation, selectivity, D2EHPA, PIM

Area: Environmental Sciences

Analysis of structural solutions of train sheds in Europe
Author:
Katarzyna Foljanty
Downloads:
25 x
 

Abstract: Great spans were already used in ancient times; however, it was the first and second industrial revolution that laid the roots of the transportation sector. Channels, roads, rail lines were built and consequently train stations followed. Prestige was very important for many railway companies and cities, and this desire was expressed by splendid structures. Although after World War II many train stations were demolished, the high-speed train brought an upturn again. With new technologies available it became possible to create spacious, light structures formed freely. The train station is the main access point to the transportation system, but it also serves as a public space. Here architecture, engineering and industrial design overlap. Structural elements, despite their loadbearing function have a major impact on the quality of the architectural space. Expression and excitement of architecture are important issues. Proper choice of structural solutions, using shades, shadows and textures make the train station a distinctive place. I would like to present an overview of the development of railway station design and give an outlook to the latest trends in the construction of passenger transportation hubs.

Keywords: train station, transportation hub, wide-span, structural system

Area: Civil Engineering, Urban Planning and Architecture

Study of big Movement of Temporary Sheet Pile in Elatf Power plant North of Egypt using Finite Element Analysis
Author:
Ahmed A. Mohamed
Downloads:
27 x
 

Abstract: The failure of sheet pile walls used for temporary works may cause loss of project construction time and money. The failure can be due to lack of knowledge about the soil conditions or a requirement of three dimension analysis, as it may be important for some cases. In this paper a study was made for a big movement during temporary excavation works using sheet pile walls. A back analysis was made using three and two dimensional finite element analysis as well as simple manual calculation in order to find out the causes of the big movement. The results from the analysis was represented and compared with field data and observation. The results from the two dimensional analysis showed higher values than that from three dimensional analysis and both indicated lower results than that from field observation. However the wall movement values deduced from F.E. indicated possible failure. The performed simple manual calculation indicated also failure. The general conclusion was considered that the failure was due to design mistake.

Keywords: finite element analysis, sheet pile, soil profile, 3D analysis, 2D analysis

Area: Civil Engineering, Urban Planning and Architecture

Non-linearity on pull-out test of cohesive soil using low tensile strengths of geogrids
Author:
Slamet Widodo, Abdelazim M. Ibrahim
Downloads:
37 x
 

Abstract: Influence of geosynthetics inserted into cohesive granular soil was obviously investigated using geosynthetics-soil-interaction-testing device (ITD). Observations were already made during undertaking pull-out test, and then the results revealed that a correlation between shear stress and normal stress exhibits non-linear behaviour. In this paper, three approaches of trend-lines namely linear, logarithmic, and polynomial were compared. From analysis, polynomial trend line gave the best correlation among others. The final equation is very important part when estimating more accurate values of cohesion and friction angle design purpose.

Keywords: pull-out test, tensile strength, geogrid, ITD, non-linear

Area: Civil Engineering, Urban Planning and Architecture

Modernist Architecture and the Sacred – the change of contemporary architecture in the perspective of the early modernism sacred buildings
Author:
Anna Maria Wierzbicka
Downloads:
36 x
 

Area: Civil Engineering, Urban Planning and Architecture

 
 
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