Smart Loads for Voltage Control in Distribution Networks

This paper shows that the smart loads (SLs) could be effective in mitigating voltage problems caused by photovoltaic (PV) generation and electric vehicle (EV) charging in low-voltage (LV) distribution networks. Limitations of the previously reported SL configuration with only series reactive compensator (SLQ) (one converter) is highlighted in this paper. To overcome these limitations, an additional shunt converter is used in back-to-back (B2B) configuration to support the active power exchanged by the series converter, which increases the flexibility of the SL without requiring any energy storage. Simulation results on a typical U.K. LV distribution network are presented to compare the effectiveness of an SL with B2B converters (SLBCs) against an SLQ in tackling under- and over-voltage problems caused by EV or PV. It is shown that SLBCs can regulate the main voltage more effectively than SLQs especially under overvoltage condition. Although two converters are required for each SLBC, it is shown that the apparent power capacity of each converter is required to be significantly less than that of an equivalent SLQ

Experience in feeding coal into a liquefaction process development unit

A system for preparing coal slurry and feeding it into a high pressure liquefaction plant is described. The system was developed to provide supporting research and development for the Bureau of Mines coal liquefaction pilot plant. Operating experiences are included

Powering the Transfer Lines TI2 and TI8

Electrical power for the transfer tunnels will be distributed from the LHC side and the SPS side. For the injection tunnel TI2, buildings LHC SR2, SPS BA6 and BA7 will be used to house the power converters and MV/LV switchboards. Galleries and ducts will facilitate cabling between power transformers and converters. For TI8, buildings LHC SR8 and SPS BA4 will be used. MBI magnets will be powered by water-cooled cables whilst rest of the magnets will be powered by conventional copper and aluminium cables. A load of 16.15 MVA and 30 MVA was intended for the existing SPS 18 kV pulsed loop by TI2 and TI8 respectively. The main compensator associated with this loop will almost reach its capacity with the load of TI2 alone. Therefore a new 18 kV pulsed link from Prevessin to BA4 will be installed, compensated by the third compensator. This paper explains how the above tasks will be achieved

Development of an improved oxygen electrode for use in alkaline H2-O2 fuel cells Quarterly report, Oct. 1 - Dec. 31, 1966

Interstitial compounds of transition elements prepared for improving oxygen electrode in alkaline hydrox fuel cel

Interstitial compounds as fuel cell catalysts - Their preparative techniques and electrochemical testing

Preparation and electrochemical testing methods for fuel cell catalysts using interstitial compound

In honour of Professor Leaf Huang, recipient of the Journal of Drug Targeting's life-time achievement award for 2018

[No abstract available]Scopu

Religious citizenship: The case of the globalised Khoja

The African Khōjā are an Indic Muslim caste, which began migrating from Sindh and Gujarat to East Africa in the late 18th century. During the 19th and 20th centuries, their economic success in an institutionally underdeveloped region coupled with a strong religious impetus allowed them to build communal municipal institutions throughout the region that both mimicked and replaced the absent state. The insecurity of postcolonial East Africa, such as the 1964 revolution in Zanzibar and the 1972 Ugandan Asian exodus, forced the Khōjā to further expand their bureaucratic apparatus towards foreign policy- migration to Western Europe and North America and requisite institutionalization. In the 21st century, the Khōjā coordinate these communal networks from North America and Western Europe to Asia and Africa towards a religious based economic development in emerging economies. Their primary identity is religious, defined from within and outwith, using the mechanisms of globalization to further communal aims internationally within a framework of religious nationalism insensible to state nationalism.Key Words: The Khōjā, Religious citizenship, Islam, Madagascar, Diaspora, Identity, Imagined CommunityRésuméLe Khoja africaine sont une caste musulmane Indic, qui a commencé la migration de Sindh et du Gujarat Afrique de l’Est à la fin du 18ème siècle. Au cours des 19e et 20e siècles, leur succès économique dans une région sous-développée sur le plan institutionnel couplé avec une forte impulsion religieuse leur a permis de construire des institutions municipales communales toute la région imité C’est Bothan et substitué à l’Etat absent. L’insécurité de l’Afrique postcoloniale de l’Est, tels que la révolution de 1964 à Zanzibar et 1972 ougandais asiatique exode, a forcé le Khoja à élargir leur appareil bureaucratique de la politique de la migration étrangère à l’Europe occidentale et l’Amérique du Nord et l’institutionnalisation nécessaire. Au 21e siècle, la Khoja coordonner Ces réseaux communautaires d’Amérique du Nord et en Europe occidentale à l’Asie et de l’Afrique vers un développement économique basé sur la religion dans les économies émergentes. Leur identité première est religieuse, définie à partir de l’intérieur et sont sortis, en utilisant les mécanismes de la mondialisation à d’autres objectifs communautaires l’échelle internationale dans le cadre de nationalisme religieux Insensible aux nationalisme d’Etat.Mots clés: Le Khoja, citoyenneté Religieuse, l’islam, Madagascar, la diaspora, identité, communauté Imagin

The use of modern tools for modelling and simulation of UAV with Haptic

Unmanned Aerial Vehicle (UAV) is a research field in robotics which is in high demand in recent years, although there still exist many unanswered questions. In contrast, to the human operated aerial vehicles, it is still far less used to the fact that people are dubious about flying in or flying an unmanned vehicle. It is all about giving the control right to the computer (which is the Artificial Intelligence) for making decisions based on the situation like human do but this has not been easy to make people understand that it’s safe and to continue the enhancement on it. These days there are many types of UAVs available in the market for consumer use, for applications like photography to play games, to map routes, to monitor buildings, for security purposes and much more. Plus, these UAVs are also being widely used by the military for surveillance and for security reasons. One of the most commonly used consumer product is a quadcopter or quadrotor. The research carried out used modern tools (i.e., SolidWorks, Java Net Beans and MATLAB/Simulink) to model controls system for Quadcopter UAV with haptic control system to control the quadcopter in a virtual simulation environment and in real time environment. A mathematical model for the controlling the quadcopter in simulations and real time environments were introduced. Where, the design methodology for the quadcopter was defined. This methodology was then enhanced to develop a virtual simulation and real time environments for simulations and experiments. Furthermore, the haptic control was then implemented with designed control system to control the quadcopter in virtual simulation and real time experiments. By using the mathematical model of quadcopter, PID & PD control techniques were used to model the control setup for the quadcopter altitude and motion controls as work progressed. Firstly, the dynamic model is developed using a simple set of equations which evolves further by using complex control & mathematical model with precise function of actuators and aerodynamic coefficients Figure5-7. The presented results are satisfying and shows that flight experiments and simulations of the quadcopter control using haptics is a novel area of research which helps perform operations more successfully and give more control to the operator when operating in difficult environments. By using haptic accidents can be minimised and the functional performance of the operator and the UAV will be significantly enhanced. This concept and area of research of haptic control can be further developed accordingly to the needs of specific applications