Graffiti Protection on Concrete in the New Building and in the Renovation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.898.9 ◽

2021 ◽

Vol 898 ◽

pp. 9-17

Author(s):

Sandra Jäntsch ◽

Ulrich Diederichs

Keyword(s):

Surface Properties ◽

Test Series ◽

Natural Weathering ◽

High Quality ◽

Protection Systems

With the increase of graffiti since the beginning of the 1970s, the interest in proper removal and high-quality protection systems also have grown. To protect affected objects and buildings from damage caused by graffiti, anti-graffiti systems (AGS) can be used. In practice, it has already been shown that no AGS is suitable for all kind of surfaces. In this study, the effects of permanent anti-graffiti systems on various concrete surfaces are specifically investigated and evaluated with test series under natural weathering (over 3 years). The focus is put on functionality (visual influences) and durability (surface properties of the concrete).

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Characterisation of V-type asteroids using phase-curves

10.5194/epsc2020-699 ◽

2020 ◽

Author(s):

Dagmara Oszkiewicz ◽

Keyword(s):

Particle Size ◽

Surface Properties ◽

Absolute Magnitude ◽

Phase Curve ◽

Main Belt ◽

Substantial Evidence ◽

High Quality ◽

Formation And Evolution ◽

Phase Functions ◽

Insight Into

Characterisation of the V-type asteroid population may help to comprehend the planetesimal formation and evolution. Asteroid phase-curves are known to relate to surface properties such as asteroid taxonomy, surface roughness, particle size distribution, albedo and many others, providing insight into surface properties of the V-types. Gil-Hutton et al. (2017) showed that the basaltic asteroids display two distinct polarimetric behaviors, which they attributed to the regolith particle size. Considering that phase-curve parameters relate to surface and regolith properties, they may verify those distinct behaviors. We observed about 20 asteroids during around 250 nights (over 500 fragmental lightcurves) to obtain high quality phase curves. We fitted the standard H,G; H,G1,G2, and H, G12 phase functions, limiting them to physical solutions only. This greatly extends the sample of well determined phase-curves for the underrepresented V-types. For asteroids with data from multiple oppositions we used a simultaneous fit assuming the same slope parameters in all apparitions and different absolute magnitude values. From these data we also derived the G12* parameter to be used in single parameter phase functions recommended for fitting low quality photometry. We do not find substantial evidence for any clustering into distinct phase curve parameters groups as suggested by Gil-Hutton et al. 2017. Only one asteroid (2763 Jeans) shows an exceptionally high G2 value. Further work should be conducted to determine slope parameters of more V-types to further verify the division of V-type asteroids into two distinct groups. Obtaining phase curves of non-Vestoids (such as those in the mid and outer Main Belt) may also help clarify if the division into distinct V-type groups is due to particle size or mineralogical differences.

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Influence of Surface Properties of Carbon Fibers Biofilm Carriers on Immobilization of Different Microorganisms

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.446-449.2844 ◽

2012 ◽

Vol 446-449 ◽

pp. 2844-2847

Author(s):

Zhao Kun Ma ◽

Jie Liu ◽

Huai He Song

Keyword(s):

Surface Properties ◽

Functional Groups ◽

Carbon Fibers ◽

Sewage Treatment ◽

Specific Area ◽

High Quality ◽

Denitrifying Bacterium ◽

Polymer Carriers ◽

Area Functional ◽

Biofilm Carriers

Results of our workgroups have shown that carbon fibers (CFs) are high quality biofilm carriers with well biocompatibility relative to other polymer carriers used in biofilm sewage treatment. In the present study, two kinds of microorganisms, namely, aerobic nitrifier and facultative aerobic denitrifying bacterium, were immobilized on the surface of different CFs, which the effects of specific area, functional groups and wettability on immobilization of these bacteria was studied. Results show that different microorganism require for different surface properties of CFs. Biomass of immobilized aerobic nitrifier increases with increasing specific areas, surface oxygenic functional groups and wettability of CFs. It can be immobilized more facultative aerobic denitrifying bacterium if there are proper specific areas, surface functional oxygenic group and wettability on the surface of CFs

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Rheology of molding materials for extruding billets to obtain copper-containing alumina-silica catalysts

NOVYE OGNEUPORY (NEW REFRACTORIES) ◽

10.17073/1683-4518-2020-5-23-28 ◽

2020 ◽

pp. 23-28

Author(s):

V. I. Vanchurin ◽

A. V. Belyakov ◽

D. Sh. Dzhumamuhamedov ◽

A. V. Fedotov

Keyword(s):

Mechanical Properties ◽

Surface Properties ◽

Active Component ◽

Silica Particles ◽

Screw Press ◽

High Quality ◽

Catalyst Synthesis ◽

Plastic Mass ◽

Molding Materials ◽

Screw Extruders

Using the example of the CAS ‒ C ceramic copper-aluminumsiliceous catalyst for dehydrogenation of cyclohexanol to cyclohexanone in the production of urea, the rheological and mechanical properties of the copper-containing aluminumsiliceous plastic mass depending on its composition are studied. The data on the influence of technological and structural conditions for molding the mass in a screw press on the performance of extrudable ceramic billets are presented. The revealed features in the behavior of the moldable plastic mass are explained by differences in the surface properties of silica particles interacting with the precursor of the active component at the stage of catalyst synthesis. The composition of the molding mass and the extrusion regimes on screw extruders are established, which ensure the output of high-quality and mechanically strong ceramic billets (extrudates).

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Solid-State Nanopore-Based DNA Sequencing Technology

Journal of Nanomaterials ◽

10.1155/2016/5284786 ◽

2016 ◽

Vol 2016 ◽

pp. 1-13 ◽

Cited By ~ 7

Author(s):

Zewen Liu ◽

Yifan Wang ◽

Tao Deng ◽

Qi Chen

Keyword(s):

Solid State ◽

Dna Sequencing ◽

Surface Properties ◽

Dna Molecules ◽

Sequencing Technology ◽

Gene Detection ◽

High Quality ◽

Translocation Velocity ◽

And Behavior

The solid-state nanopore-based DNA sequencing technology is becoming more and more attractive for its brand new future in gene detection field. The challenges that need to be addressed are diverse: the effective methods to detect base-specific signatures, the control of the nanopore’s size and surface properties, and the modulation of translocation velocity and behavior of the DNA molecules. Among these challenges, the realization of the high-quality nanopores with the help of modern micro/nanofabrication technologies is a crucial one. In this paper, typical technologies applied in the field of solid-state nanopore-based DNA sequencing have been reviewed.

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