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The railway track system is the platform by which loads from moving trains are transferred to the underlying soil or supporting infrastructure such as bridges. The most common type of railway track system is ballasted track, which has been in use for over a century. Ballasted track has proved versatile. It can be constructed using locally available materials and with modifications to the rails and sleepers, crossings transferring trains from one route to another can be created. The structure of a ballasted track system consists of two main parts. The upper portion, termed the superstructure, comprises the rails, fastenings and sleepers. It is formed of components whose shape, stiffness and strength are designed and closely controlled. Below the superstructure is the substructure, which comprises the ballast and sub-ballast. Although the materials used in the substructure may have been specified, their engineering properties and geometric placement are less well controlled. In this chapter, we will explore how a typical ballasted track system transfers load to the ground and the ways in which the track form deteriorates, requiring maintenance and eventually renewal.

Social Entrepreneurship, Organizational Behavior.

This case is suitable to be used in advanced undergraduate and MBA/MSc level.

This case teaches about green organization, its opportunity, challenges, and attitude toward sustainable agriculture. The Babylon Vertical Farms (BVF) is an agricultural and technological company that grew high-quality hydroponic vegetables and herbs with minimum use of sunlight, soil, and pesticides. BVF used recycled water through reverse osmosis process with the target to decrease cultivated time to less than six hours, when compared to the typical 18 hours, apart from minimizing water usage up to 90%. Knowing its potential, Stuart Thomas, the founder and his team planned to increase the farm production to 2,000–3,000 kg a month from 1,000 kg a month. The farm required RM150,000 to acquire resources and to extend its farm infrastructure. Stuart and his team had to make feasible and practical decision in gaining their funds to execute the business to be one that is sustainable and green. As a social entrepreneur, Stuart also wanted to address poverty-related hunger. A group of investors was ready to invest and asked for 30% equity. Stuart was tempted to take the offer. If he rejected the offer, the farm could lose the opportunity to scale-up its operation. At the same time, if he accepted the offer, he might lose control over the business one day.

The learning outcomes are as follows:

• to expose students to the various forms of urban farming that a social entrepreneur can venture into;

• to expose students to the benefits of green business;

• to evaluate potential opportunities and threats of a green organization using SWOT analysis; and

• to recommend a possible strategy to build a sustainable agriculture farm that is economically viable, environmentally sound, and socially responsible.

to expose students to the various forms of urban farming that a social entrepreneur can venture into;

to expose students to the benefits of green business;

to evaluate potential opportunities and threats of a green organization using SWOT analysis; and

to recommend a possible strategy to build a sustainable agriculture farm that is economically viable, environmentally sound, and socially responsible.

There is an urgent need to develop climate-smart agrosystems capable of mitigating climate change and adapting to its effects. Conventional agricultural practices prevail in Mauritius, whereby synthetic chemical fertilizers, pesticides and insecticides are used. It should be noted that Mauritius remains a net-food importing developing country of staple food such as cereals and products, roots and tubers, pulses, oil crops, vegetables, fruits and meat (FAO, 2011). In Mauritius, the agricultural sector faces extreme weather conditions like drought or heavy rainfall. Moreover, to increase the crop yields, farmers tend to use 2.5 times the prescribed amount of fertilizers in their fields. These excess fertilizers are washed away during heavy rainfall and contaminate lakes and river waters. By using smart irrigation and fertilization system, a better management of soil water reserves for improved agricultural production can be implemented. Soil Nitrogen, Phosphorus and Potassium (NPK) content, humidity, pH, conductivity and moisture data can be monitored through the cloud platform. The data will be processed at the level of the cloud and an appropriate mix of NPK and irrigation will be used to optimise the growth of the crops. Machine learning algorithms will be used for the control of the land drainage, fertilization and irrigation systems and real time data will be available through a mobile application for the whole system. This will contribute towards the Sustainable Development Goals (SDGs): 2 (Zero Hunger), 11 (Sustainable cities and communities), 12 (Responsible consumption and production) and 15 (Life on Land). With this project, the yield of crops will be boosted, thus reducing the hunger rate (SDG 2). On top of that, this will encourage farmers to collect the waters and reduce fertilizer consumption thereafter sustaining the quality of the soil on which they are cultivating the crops, thereby increasing their yields (SDG 15).

Nature-based solutions (NBS) generate different impacts at the urban scale, such as the ability to regulate water or store carbon, comparable to traditional, gray infrastructures in a more cost-efficient way. On the other hand, by their intrinsic nature, NBS do deliver a series of other services that are commonly defined as social, economic, and environmental cobenefits. These benefits are not always valued in a consistent and complete way, so there is the need to compile a more comprehensive evidence base on the social, economic, and environmental effectiveness of NBS. The chapter attempts to identify a categorization of the existing NBS and define the ecosystem services (ES) provided by them. Furthermore, starting from the results achieved through the definition of the existing NBS frameworks assessment, the chapter will identify a set of key performance indicators KPIs, based on the ES produced by NBS, to measure the economic, social, and environmental benefits generated in by NBS at the urban level taking into account their multifunctional character. In total, 66 key performance indicators have been individuated: 3 for provisioning services, 38 for regulating services, 17 for cultural services, and 8 for supporting services. Each indicator has been associated to a category of ES in order to measure and evaluate the performances of NBS implemented in cities.

The impact of climate change towards water surface resources is crucial, particularly in developing and non-developing countries. Groundwater as a main water resource is thus an essential. However, contamination due to hydrocarbon spills affects the groundwater as a water resource, especially as a main source of drinking water. This chapter investigates the light non-aqueous phase liquid (LNAPL) penetrations in double-porosity soil with different moisture contents and with or without vibration impact. It also explains the LNAPL penetration phenomena by employing image analysis. The physical laboratory experiments were implemented using an acrylic cylinder, a mirror, toluene and a Nikon D90 DSLR digital camera. Prepared soil was poured in an acrylic cylinder and compressed with compressor until it became 10 cm in height. LNAPL was then poured instantaneously onto the acrylic cylinder that was filled with soil sample. The LNAPL penetration patterns were recorded and monitored using a Nikon D90 DSLR digital camera. The processing technique was conducted at predetermined time intervals using Surfer software and Matlab routine to plot the LNAPL pattern. The results showed that a higher penetration rate of LNAPL occurred with higher moisture content and without vibration impact. The penetration time for LNAPL to reach the bottom of the soil sample was found to be longer for the soil that had low moisture content and with vibration impact.

Soil is a non-renewable and increasingly deteriorating resource, yet it is barely protected by European Union (EU) legislation. This constitutes a puzzling gap within the otherwise encompassing and progressive environmental policy of the EU. To explain the integration resistance of soil protection, I draw on insights from rationalist and sociological institutionalist theory. The institutional rigidity of the community method of environmental decision-making limits policy change to favorable interest constellations, but this constraint is usually compensated by agenda competition among the national environmental pioneers. However, successful agenda-setting depends on the skillful combination of political venues and issue frames. Matters of land politics, such as soil protection, are difficult to frame in terms that make them suitable for European policy venues. The theoretical argument is illustrated using an in-depth case study of the agenda-setting, negotiation, and eventual withdrawal of the ill-fated proposal for an EU soil framework directive, with a focus on the changing role of Germany. Reframing of soil politics as locally bound and as essentially national affair, subnational actors extended the conflict to include the German federal chamber as policy venue. As a result, Germany turned from “pusher by example” and first mover to “defensive front-runner,” successfully pursuing a blocking strategy.