Nanofiltration for the Treatment of Oil Sands-Produced Water

This chapter summarizes nanofiltration (NF) studies focused on the treatment of thermal in-situ steam-assisted gravity drainage (SAGD)-produced water streams in the Alberta, Canada, oil sands industry. SAGD processes use recycled produced water to generate steam, which is injected into oil-bearing formations to enhance oil recovery. NF has potential applications in the produced water recycling treatment process for water softening, dissolved organic matter removal, and partial desalination, to improve recycle rates, reduce make-up water consumption, and provide an alternative to desalination technologies (thermal evaporation and reverse osmosis). The aim of this study was to provide proof-of-concept for NF treatment of the following produced water streams in the SAGD operation: warm lime softener (WLS) inlet water, boiler feed water (BFW), and boiler blowdown (BBD) water. Commercial NF membranes enabled removal of up to 98% of the total dissolved solids (TDS), total organic carbon (TOC), and dissolved silica, which is significant compared to the removal achieved using conventional SAGD-produced water treatment processes. More than 99% removal of divalent ions was achieved using tight NF membranes, highlighting the potential of NF softening for oil sands-produced water streams. The NF process configurations studied provide feasible process arrangements suitable for integration into existing and future oil sands and other produced water treatment schemes

An evaluation of cattle types for the east Kimberley

The first cattle to be introduced to Western Australia\u27s Kimberley region arrived at Ord River Station in 1884, after Nathaniel Buchanan had walked 4000 head of Shorthorn cattle overland from Queensland, on behalf of the owners, Osmond and Panton. In the early years of the Kimberley pastoral industry the virgin pastures allowed stock numbers to increase rapidly. Little consideration was given to stock or rangeland management, or to whezther other types of cattle could be raised for improved production. The Department of Agriculture started a comprehensive trail at Ord Regeneration Research Station (previously Ord River Station) in 1980 to evaluate the fertility, mortality and growth rate of Brahman and Africander cattle and their crosses. This article discusses some of the highlights of this eight-year trial, and the implications for the industry

Is There an Environmental Kuznets Curve for Sulfur?

The environmental Kuznets curve (EKC) hypothesis proposes that there is an inverted U-shape relation between environmental degradation and income per capita. Various explanations for this phenomenon have been put forward and some authors argue that important explanatory variables are omitted from conventional EKC estimates. Inclusion of these omitted variables is argued to increase the estimated "turning point" - the level of GDP per capita above which environmental degradation is declining. In this paper we use a new cross-section/time-series data base of sulfur emissions for a wide range of developed and developing countries. The methodology involves estimating EKCs for subsets of this database as well as for the sample as a whole. The results show that estimating an EKC using data for only the OECD countries, as has often been the case, leads to estimates where the turning point is at a much lower level than when the EKC is estimated using data for the World as a whole. The paper explores possible explanations of these results using Monte Carlo analysis, and other statistical tests.We conclude that the simple EKC model is fundamentally misspecified and that there are omitted variables which are correlated with GDP

Moving from traditional government to new adaptive governance: the changing face of food security responses in South Africa

The food system faces increasing pressure from dynamic and interactive, environmental, political and socio-economic stressors. Tackling the complexity that arises from such interactions requires a new form of 'adaptive governance'. This paper provides a review of various conceptions of governance from a monocentric or politicotechnical understanding of governance through to adaptive governance that is based in complex adaptive systems theory. The review is grounded by a critique of the existing institutional structures responsible for food security in South Africa. The current Integrated Food Security Strategy and tasked governmental departments are not sufficiently flexible or coordinated to deal with an issue as multi-scalar and multidisciplinary as food security. However, actions taken in the non-governmental sector signal the emergence of a new type of governance. Apart from an increasing recognition of food security as an issue of concern in the country, there is also evidence of a changing governance structure including collaboration between diverse stakeholders. We review these governance trends with an understanding of the food system as a complex adaptive socio-ecological system where actors in the food system self-organize into more flexible networks that can better adapt to uncertain pressure

Phosphorylation and Ubiquitylation Regulate Protein Trafficking, Signaling, and the Biogenesis of Primary Cilia

The primary cilium is a solitary, microtubule-based membrane protrusion extending from the surface of quiescent cells that senses the cellular environment and triggers specific cellular responses. The functions of primary cilia require not only numerous different components but also their regulated interplay. The cilium performs highly dynamic processes, such as cell cycle-dependent assembly and disassembly as well as delivery, modification, and removal of signaling components to perceive and process external signals. On a molecular level, these processes often rely on a stringent control of key modulatory proteins, of which the activity, localization, and stability are regulated by post-translational modifications (PTMs). While an increasing number of PTMs on ciliary components are being revealed, our knowledge on the identity of the modifying enzymes and their modulation is still limited. Here, we highlight recent findings on cilia-specific phosphorylation and ubiquitylation events. Shedding new light onto the molecular mechanisms that regulate the sensitive equilibrium required to maintain and remodel primary cilia functions, we discuss their implications for cilia biogenesis, protein trafficking, and cilia signaling processes

Simulation Game Concept For AI-Enhanced Teaching Of Advanced Value Stream Analysis and Design

Value stream analysis and design is employed globally by improvement teams within industrial settings to maximize value creation and eliminate waste. For ending methodical time-centricity, research expanded the methodology to incorporate diverse facets like material flow cost accounting, information logistics, and external influence factors. These enhancements, along with increasing data volumes, are prompting a re-evaluation of how professional improvement teams should think and operate. Consequently, a transformation of the pedagogical approach used for educating students and professionals necessitates novel solutions. Conventional teaching methods such as expository lectures are widely considered inadequate in promoting knowledge retention and engagement. So far, existing research has not yet resulted in a solution that can effectively impart the methodological complexity of advanced value stream analysis and design in a motivating and vivid fashion. To address this gap, this paper applies a tailored CRISP gamification framework to develop a simulation game concept. These concept enables AI-enhanced teaching of advanced value stream analysis and design focusing on identification of multi-stage resource-efficient optimization strategies. Through integration of game-based learning with AI a trained reinforcement learning agent can act either competitively or cooperatively, creating a unique form of teaching accounting the aspects personalization, adaptive feedback, content creation, and analysis and assessment

Tenuous Foundations: Historical Lessons for Modern Land Agreements

The past decade has seen a wave of land leases, sales and concessions unparalleled since colonial times. Concurrently, many countries are embroiled in ongoing remedial and restitutive work over historical land leases, sales and concessions that have failed or had unforeseen consequences. This raises the question of whether historical agreements can provide insights into long-term outcomes of latter-day land deals. Three cases are reviewed of agreements between British authorities and indigenous groups, and the outcomes are compared critically. The article concludes that the terms of such agreements are often far broader than the written words, and that if modern agreements are to avoid complications in the long term they should be closely attuned to the longevity of verbal commitments, cultural protocols and trust relationships.Peer Reviewe

Proving MEMS technologies for smarter railway infrastructure

Quantifying how railway track responds to passing trains in terms of displacement, velocity or acceleration, can provide insights into both the performance and the condition of the track. A number of trackside monitoring technologies have been shown to be capable of providing this information; however these are primarily research tools and tend to be costly hence actual deployments are relatively limited in scope. To assess systematically the changing health of railway track, more cost-effective continuous approaches to monitoring are required. Micro electrical mechanical systems (MEMS) are commonplace sensors in consumer electronics, low cost and can be used to measure acceleration. Thus they have the potential to provide the kind of data required to assess railway track behaviour at a much lower cost and in an environmentally robust small deployment package. However confidence in the quality of the data is required. This paper discusses the criteria for the selection of MEMS devices for this application. Laboratory trials and direct comparison of trackside measurements with well-established monitoring techniques demonstrate the effectiveness of the selected MEMS devices, and show their potential for use in continuous monitoring schemes to evaluate changes in track performance. The paper thus provides evidence that these kinds of low cost technologies are suitable for railway applications, building confidence in their use and enabling their adoption in self-monitoring smart infrastructure