Assessment of sensor performance

There is an international commitment to develop a comprehensive, coordinated and sustained ocean observation system. However, a foundation for any observing, monitoring or research effort is effective and reliable in situ sensor technologies that accurately measure key environmental parameters. Ultimately, the data used for modelling efforts, management decisions and rapid responses to ocean hazards are only as good as the instruments that collect them. There is also a compelling need to develop and incorporate new or novel technologies to improve all aspects of existing observing systems and meet various emerging challenges. Assessment of Sensor Performance was a cross-cutting issues session at the international OceanSensors08 workshop in Warnemünde, Germany, which also has penetrated some of the papers published as a result of the workshop (Denuault, 2009; Kröger et al., 2009; Zielinski et al., 2009). The discussions were focused on how best to classify and validate the instruments required for effective and reliable ocean observations and research. The following is a summary of the discussions and conclusions drawn from this workshop, which specifically addresses the characterisation of sensor systems, technology readiness levels, verification of sensor performance and quality management of sensor systems

Determination of metabolic rates and quotients in fish

Before any growth can be,achieved by an organism there must be sufficient energy in the food to provide for the metabolic demands of maintenance and any activity associated with food intake. In culture practices it is possible to reduce these energy costs to a minimum and to optimize food conversion. This can be done through an understanding of the environmental and biological factors affecting metabolic rate with a view to reduce the demands on the system and hence increase the production. It is therefore desirable to examine the broad picture of energy exchange within an animal; then proceed to more specific considerations in fish. Since it is the principles and prospects which are of major interest here, no attempt is made to make this a major review of the subject

Rapid Physical Models: A New Phase in Industrial Design

Rapid prototyping, especially in the form of 3D printing, has pervaded over key aspects of design engineering since the start of this millennium. Today, rapid physical model making has applications in engineering, architecture, design, and fine art. While 3D printing today is mostly about prototyping of design as a precursor to production, not many have studied the use of 3D for industrial design in detail. With core responsibilities for three important nodes of user experience, namely function, human factors (ergonomics) and the aesthetics and emotion, 3D printing has been playing a major role in the process of industrial design. This chapter elucidates this through examples leading the reader to think about the future practice of rapid physical model making in industrial design. The chapter concludes by mentioning future scenarios that industrial design may take with constant innovations in 3D printing

Transportation of live Finfishes and Shellfishes

Livefish trade, especially the live ornamental fish and live seafood trade, is emerging as a major business venture in most of the tropical countries. Production of livefish through aquaculture has also undergone vast changes during the past 20 years. In aquaculture, transport of broodstock from the wild to the hatchery or seed from the hatchery to the growouts forms one of the basic requirements. The demandfor livefiriflsh and shellfish is rapidly increasir^g and in most of the developed countries, more and more livefish traders and restaurants are offering live fishery products to their customers. Air liftiry of live se<^ood has also increased during the last few years. The mcgor constraint to the development of live seafood export is the lack of information on handling the aquatic organisms after they are caught, right through the transport and sale to the customers. Necessary precautions have to be taken while catching, packing and transporting the aquatic organisms. Apart from careful handling, a thorough knowledge of the behaviour and physiology of the animal is necessary to minimise the stress during storage and transportation

Status of feed management

Feed management is playing a vital role in aquaculture as half of the operational cost comes from feed. Great care must be taken unless the farmer will incur loss

Some investigations on the activity of phenol oxidase in the isopod Cirolana fluviatilis

Phenol oxidase activity in the isopod Cirolana fluviatilis averaged 0.0015 w.units/mg protein/min in the larger isopod.samples (10-17 mg) and 0.00034 O.D. units/mg protein/min in the smaller samples (6-9 mg). The enzyme showed equal affinity for epinephrine and dopamine and >5O% affinity for DOPA

Significance of farm-made feeds in the Indian context

The bulk of shrimp production comes from semi-intensive farming in the brackish water systems. The nutritional requirements of shrimpalong with their feeding in these systems is complex and poorly understood primarily due to the difficulties encountered in quantifying the contribution of naturally available food organisms

The role of symmetry in driven propulsion at low Reynolds number

We theoretically and experimentally investigate low-Reynolds-number propulsion of geometrically achiral planar objects that possess a dipole moment and that are driven by a rotating magnetic field. Symmetry considerations (involving parity, $\widehat{P}$, and charge conjugation, $\widehat{C}$) establish correspondence between propulsive states depending on orientation of the dipolar moment. Although basic symmetry arguments do not forbid individual symmetric objects to efficiently propel due to spontaneous symmetry breaking, they suggest that the average ensemble velocity vanishes. Some additional arguments show, however, that highly symmetrical ($\widehat{P}$-even) objects exhibit no net propulsion while individual less symmetrical ($\widehat{C}\widehat{P}$-even) propellers do propel. Particular magnetization orientation, rendering the shape $\widehat{C}\widehat{P}$-odd, yields unidirectional motion typically associated with chiral structures, such as helices. If instead of a structure with a permanent dipole we consider a polarizable object, some of the arguments have to be modified. For instance, we demonstrate a truly achiral ($\widehat{P}$- and $\widehat{C}\widehat{P}$-even) planar shape with an induced electric dipole that can propel by electro-rotation. We thereby show that chirality is not essential for propulsion due to rotation-translation coupling at low Reynolds number.Comment: 5 pages, 5 figure

The Traded Water Footprint of Global Energy from 2010 to 2018

The energy-water nexus describes the requirement of water-for-energy and energy-for-water. The consumption of water in the production and generation of energy resources is also deemed virtual water. Pairing the virtual water estimates for energy with international trade data creates a virtual water trade network, facilitating analysis of global water resources management. In this database, we identify the virtual water footprints for the trade of eleven different energy commodities including fossil fuels, biomass, and electricity. Additionally, we provide the necessary scripts for downloading and pairing trade data with the virtual water footprints to create a virtual water trade network. The resulting database contains country-to-country virtual water trade from 2010–2018, broken down by commodity. The purpose of this data descriptor is to provide detailed methods and validation of the dataset beyond the complementary research publication. The resulting database provides opportunities to understand global energy-related water demands and advance future global water resources research

An Integrated Assessment of the Global Virtual Water Trade Network of Energy

The global trade of energy allows for the distribution of the world\u27s collective energy resources and, therefore, an increase in energy access. However, this network of trade also generates a network of virtually traded resources that have been used to produce energy commodities. An integrated database of energy trade water footprints is necessary to capture interrelated energy and water concerns of a globalized economy,and is also motivated by current climate and population trends. Here, we quantify and present the virtual water embedded in energy trade across the globe from 2012 to 2018, building on previous water footprinting and energy virtual water trade studies to create an integrated database. We use data from the United Nations Comtrade database and combine several literature estimates of water consumption of energy commodities to generate the global virtual water trade network. Results include a comprehensive database of virtual water trade for energy at the country level, greatly expanding the literature availability on virtual water trade. The total volume of virtual water trade increased 35% from 157 km3 in 2012 to 211 km3 in 2018. The global trade of oil and fuelwood are consistent drivers of virtual water trade over time, whereas coal, hydrocarbons, and charcoal collectively contribute less than 4% of total virtual water trade between 2012 and 2018. Electricity, despite a less dense trade network constrained by infrastructure, contributes notably to virtual water trade, driven largely by water use for hydroelectricity. This study develops an integrated assessment of previous virtual water studies to estimate global virtual water trade of energy, creating a platform for future global studies