Impact evaluation of green–grey infrastructure interaction on built-space integrity: An emerging perspective to urban ecosystem service

This paper evaluates the role of urban green infrastructure (GI) in maintaining integrity of built-space. The latter is considered as a lateral ecosystem function, worth including in future assessments of integrated ecosystem services. The basic tenet is that integrated green–grey infrastructures (GGIs) would have three influences on built-spaces: (i) reduced wind withering from flow deviation; (ii) reduced material corrosion/degeneration from pollution removal; and (iii) act as a biophysical buffer in altering the micro-climate. A case study is presented, combining the features of computational fluid dynamics (CFD) in micro-environmental modelling with the emerging science on interactions of GGIs. The coupled seasonal dynamics of the above three effects are assessed for two building materials (limestone and steel) using the following three scenarios: (i) business as usual (BAU), (ii) summer (REGEN-S), and (iii) winter (REGEN-W). Apparently, integrated ecosystem service from green–grey interaction, as scoped in this paper, has strong seasonal dependence. Compared to BAU our results suggest that REGEN-S leads to slight increment in limestone recession (< 10%), mainly from exacerbation in ozone damage, while large reduction in steel recession (up to 37%) is observed. The selection of vegetation species, especially their bVOC emission potential and seasonal foliage profile, appears to play a vital role in determining the impact GI has on the integrity of the neighbouring built-up environment

Implementation and Validation of a High Accuracy UAV-Photogrammetry Based Rail Track Inspection System

The regular inspection of the crane tracks of storage cranes at the Container Terminal Altenwerder (CTA), Hamburg requires high accuracy of measurements to determine its position. The allowed tolerances are in the range of 10 mm in the XY plane on a track length of 300 m. The traditional semi-automatic surveying methods are slow and require the interruption of the activities in the storage blocks. The research project AeroInspekt proposed a fully automatic measurement of the position of the tracks using UAV-based photogrammetry. In this paper, the results of the test campaign, carried out in June 2020, were presented where different cameras (150 mm and 80 mm telelens) and flight speeds (1.1 m/s and 1.9 m/s) at a 35 m flying height were performed. Furthermore, an automated rail delineation in the derived surface model was developed and evaluated with ground reference measurements. The results show that the required accuracy of the rail position with an RMSE of 3 mm in XY plane and 8 mm in altitude can be achieved with comparatively less disruption of regular block activities

Impact assessment of social media usage in B2B marketing: A review of the literature and a way forward

Although various critical elements, such as media publicity, word of mouth, legislation, and environmental factors, are not under the control of a company, they play a significant role in influencing its brand image. Uncertainty over how different social networking sites can support brands is one of the crucial reasons for the delayed acceptance of social media (SM) in business-to-business (B2B) transactions. SM possesses immense potential in relation to gathering customer data and assisting B2B marketers. Therefore, this study reviewed SM usage in the B2B context, based on 294 selected articles. The methodology included bibliometric analysis to identify the impact of SM usage in the B2B domain and content analysis to perform a thematic assessment. Our analysis found that many B2B firms cannot leverage SM’s potential to its fullest compared to business-to-customer (B2C) firms. However, SM can help B2B marketers build their brand presence and trust globally, ultimately helping them find potential customers and build relationships with global supply chain providers

Incorporation of Silica Fumes and Waste Glass Powder on Concrete Properties Containing Crumb Rubber as a Partial Replacement of Fine Aggregates

Waste management is the first priority for many countries, so the focus of this research is on using waste materials in concrete as fillers and substituting concrete ingredients such as crumb rubber (CR) for fine aggregates. The utilization of waste rubber in concrete has gained attention recently, but CR substitution results in a reduction in mechanical and durability properties due to weak bonding and lower stiffness of CR. To overcome this issue, the addition of strength-increasing waste materials as cement substitutes is investigated along with CR (5%, 10%, and 15%) as fine aggregates and tested for the mechanical and durability behavior of concrete. Constant 10% waste glass powder (WGP) and 10% silica fume (SF) were substituted with cement in separate mixes. The main goal of this study is to investigate the suitable proportion of the materials from SF and WGP for enhancing rubberized concrete’s properties and to evaluate waste materials’ uses considering various parameters. The concrete is compared for both materials used as well as with control concrete and CR concrete for properties such as workability, compressive strength, tensile strength, density, ultrasonic pulse velocity, and dynamic modulus of elasticity. The reduction in compressive strength, tensile strength, workability, density, ultrasonic pulse velocity, and dynamic modulus of elasticity was observed due to the incorporation of CR, but also an increase in these properties with the incorporation of silica fumes (SF) and waste glass powder (WGP) as cement. It was observed that SF enhanced the properties of rubberized concrete better as compared to WGP. The 10% SF with 5% CR enhanced the compressive strength of rubberized concrete without SF by 11%. Similarly, 10% of WGP with 5% of CR enhanced the compressive strength of rubberized concrete by 6%

Incorporation of Silica Fumes and Waste Glass Powder on Concrete Properties Containing Crumb Rubber as a Partial Replacement of Fine Aggregates

Waste management is the first priority for many countries, so the focus of this research is on using waste materials in concrete as fillers and substituting concrete ingredients such as crumb rubber (CR) for fine aggregates. The utilization of waste rubber in concrete has gained attention recently, but CR substitution results in a reduction in mechanical and durability properties due to weak bonding and lower stiffness of CR. To overcome this issue, the addition of strength-increasing waste materials as cement substitutes is investigated along with CR (5%, 10%, and 15%) as fine aggregates and tested for the mechanical and durability behavior of concrete. Constant 10% waste glass powder (WGP) and 10% silica fume (SF) were substituted with cement in separate mixes. The main goal of this study is to investigate the suitable proportion of the materials from SF and WGP for enhancing rubberized concrete&rsquo;s properties and to evaluate waste materials&rsquo; uses considering various parameters. The concrete is compared for both materials used as well as with control concrete and CR concrete for properties such as workability, compressive strength, tensile strength, density, ultrasonic pulse velocity, and dynamic modulus of elasticity. The reduction in compressive strength, tensile strength, workability, density, ultrasonic pulse velocity, and dynamic modulus of elasticity was observed due to the incorporation of CR, but also an increase in these properties with the incorporation of silica fumes (SF) and waste glass powder (WGP) as cement. It was observed that SF enhanced the properties of rubberized concrete better as compared to WGP. The 10% SF with 5% CR enhanced the compressive strength of rubberized concrete without SF by 11%. Similarly, 10% of WGP with 5% of CR enhanced the compressive strength of rubberized concrete by 6%