8,845 research outputs found
New Forms of Governance: Changing Relationships between Corporates, Government and Community
No full textFuji Xerox Australia Eco Manufacturing Centre: A case study in strategic sustainability
No full textToday humankind faces two major crises. The first is the global financial crisis that began in 2008. The second is ecological and has been slowly building since the industrial revolution. The ecological crisis is now gaining momentum as we witness the meltdown of the world's glaciers and a range of related issues such as widespread weather volatility, desertification and food shortages. The two crises are intimately related. In the words of leading ecologist Tim Flannery: 'We have become the 'future eaters', living beyond the earth's ability to replace the resources we consume'. As a consequence, there is a need for up-to-date, relevant course materials-and particularly case studies-addressing the challenges ahead. Corporate sustainability is increasingly central to strategy in modern businesses. Learning about sustainability lends itself to the use of case studies because: (1) case studies demonstrate that sustainability is not some fantasy but a business imperative; (2) sustainability issues do not come in neat packages but cut across the traditional academic disciplines; and (3) case studies allow the relevance of theories to be tested. As the title of this book indicates, the primary emphasis is on corporate sustainability but an emphasis has also been placed on corporate change. Sustainability will not be achieved through technological fixes alo? corporate culture needs to change also
Yarra Valley Water: Learning and change for sustainability
No full textToday humankind faces two major crises. The first is the global financial crisis which began in 2008. The second is ecological and has been slowly building since the industrial revolution. The ecological crisis is now gaining momentum as we witness the meltdown of the worlds glaciers and a range of related issues such as widespread weather volatility, desertification and food shortages. The two crises are intimately related. In the words of leading ecologist Tim Flannery: `We have become the `future eaters, living beyond the earths ability to replace the resources we consume. As a consequence, there is a need for up-to-date, relevant course materialsand particularly case studiesaddressing the challenges ahead. Cases in Corporate Sustainability and Change: A Multidisciplinary Approach includes Australian and New Zealand as well as international cases. Corporate sustainability is increasingly central to strategy in modern businesses. Learning about sustainability lends itself to the use of case studies because: (1) case studies demonstrate that sustainability is not some fantasy but a business imperative; (2) sustainability issues do not come in neat packages but cut across the traditional academic disciplines; and (3) case studies allow the relevance of theories to be tested. As the title of this book indicates, the primary emphasis is on corporate sustainability but an emphasis has also been placed on corporate change. Sustainability will not be achieved through technological fixes alone; corporate culture needs to change also
Synthesising governance themes from political and management theory
No full textIn this chapter we explore, both theoretica lly and empirically, how the relationship between political systems and corporate governance practices can be used to progress corporate sustainability. We argue that corporate sustainabil ity is facili tated by ' total responsibility management ' , as outlined by Waddock et al. (2002). Waddock et al. 2002 argue that corporate sustainability requires internal corporate governance to move beyond compliance to the holistic approach of 'total responsibil ity management'
Common Mode Currents in DC Power Routers
No full textThe grid reinforcement and energy redirection needs have led to the emergence of Back-To-Back Voltage Source Converter (BTB-VSC) based dc power routers. This paper investigates the low frequency Common Mode Currents (CMCs) that arise in the system if the employed BTB-VSCs have an un-isolated ac path connected in parallel to their output ports. Simulation results are presented to show a sensitivity analysis of lower order harmonics in CMC with respect to the operating active and reactive power of the dc router, dc link voltage, link resistance, modulation method and pole capacitance. Experimental results are shared to show existance of lower order CMC in 3-wire ac link operating in parallel with the dc power router and these are mitigated using zero sequence controller
Modeling, Control, and Operation of an M-DAB DC-DC Converter for Interconnection of HVDC Grids
No full textFuture high-voltage direct-current (HVDC) networks based on voltage source converters (VSCs) will have different structures (asymmetric monopolar, bipolar, or symmetric monopolar), voltage levels, control, and protection schemes. Therefore, dc-dc converters are needed to interconnect those VSC-HVDC grids and several technical issues on their control and operational systems must be adequately addressed. A dc-dc converter based on a modular-dual active bridge (M-DAB) converter is suggested to reach a desirable interconnection of the HVDC grids and regulate power flow (PF) between them. A dynamic averaged model is proposed for the M-DAB converter and its stability is analyzed using the Lyapunov function. Moreover, a new local controller based on nonlinear control theory is proposed for the M-DAB. The new M-DAB local controller is integrated with the energy management system (EMS), by updating the PF equations, to create a complete control structure. Considering the CIGRE DCS3 HVDC test system and the studied M-DAB, static, dynamic simulation, and experimental studies are conducted and the dc-dc converter and the performance of the designed controllers and the EMS are examined and validated.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Intelligent Electrical Power Grid
Restructuring the existing medium voltage distribution grids using DC systems
No full textGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.DC systems, Energy conversion & Storag
Cold cracking in DC-cast high strength aluminum alloy ingots: An intrinsic problem intensified by casting process parameters
No full textFor almost half a century the catastrophic failure of direct chill (DC) cast high strength aluminum alloys has been challenging the production of sound ingots. To overcome this problem, a criterion is required that can assist the researchers in predicting the critical conditions which facilitate the catastrophic failure of the ingots. This could be achieved at first glance by application of computer simulations to assess the level and distribution of residual thermal stresses. However, the simulation results are only able to show the critical locations and conditions where and when high stresses may appear in the ingots. The prediction of critical void/crack size requires simultaneous application of fracture mechanics. In this paper, we present the thermo-mechanical simulation results that indicate the critical crack size distribution in several DC-cast billets cast at various casting conditions. The simulation results were validated upon experimental DC-casting trials and revealed that the existence of voids/cracks with a considerable size is required for cold cracking to occur.Materials Science & EngineeringMechanical, Maritime and Materials Engineerin
A Dynamically Reconfigurable Recursive Switched-Capacitor DC-DC Converter with Adaptive Load Ability Enhancement
No full textMultiple voltage conversion ratio (VCR) recursive switched-capacitor (SC) dc-dc converters, based on several basic 2:1 converters, are widely used for on-chip power supplies due to their flexible VCRs for higher energy efficiency. However, conventional multiple VCR SC converters usually have one or more 2:1 converters unused for some VCRs, which results in lower power density and chip area wastage. This article presents a new recursive dc-dc converter system, which can dynamically reconfigure the connection of all on-chip 2:1 converter cells so that the unused converters in the conventional designs can be reused in this new architecture for increasing the load-driving capacity, power density, and power efficiency. To validate the design, a 4-bit-input 15-ratio system was designed and fabricated in a 180-nm BCD process, which can support a maximum load current of \text{0.71}\,\text{mA} and achieves a peak power efficiency of 93.1% with 105.3\,\mu \text{A/mm} {2} chip power density from a 2-V input power supply. The measurement results show that the load-driving capacity can become 6.826×, 2.236×, and 2.175× larger than the conventional topology when the VCR is 1/2, 1/4, and 3/4, respectively. In addition, the power efficiency under these specific VCRs can also be improved considerably.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Instrumentatio
- …
