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The objective of this paper is to implement a baseband OFDM transceiver on FPGA hardware. The design uses 8-point SLT/ISLT (Slantlet/Inverse Slantlet) for the processing module with processing block of 8 inputs data wide. All modules are designed and implemented using VHDL programming language. Software tools used in this work includes Altera Quartus II 7.2 and ModelSim Altera 6.1g, to assist the design process and downloading process into FPGA board while Cyclone III board EP3C120F780C7 is used to realize the designed module.
This paper presents the design procedure and implementation results of a proposed software defined radio (SDR) using Altera Cyclone II family board. The implementation uses Matlab/SimulinkTM, Embedded MatlabTM blocks, and Cyclone II development and educational board. The design has first implemented in Matlab/SimulinkTM environment. It is then converted to VHDL level using Simulink HDL coder. The design is synthesized and fitted with Quartus II 9.0 Web Edition® software, and downloaded to Altera Cyclone II board. The results show that it is easy to develop and understand the implementation of SDR using programmable logic tools. The paper also presents an efficient design flow of the procedure followed to obtain VHDL netlists that can be downloaded to FPGA boards.
Water security is a major concern for water-scarce cities that face dynamic water challenges due to limited water supply, climate change and increasing water demand. Framing urban water security is challenging due to the complexity and uncertainties of the definitions and assessment frameworks concerning urban water security. Several studies have assessed water security by granting priority indicators equal weight without considering or adapting to the local conditions. This study develops a new urban water security assessment framework with application to the water-scarce city
of Madaba, Jordan. The study applies the new assessment framework on the study area and measures urban water security using the integrated urban water security index (IUWSI) and the analytic hierarchy process (AHP) as a decision management tool to prioritise and distinguish indicators that affect the four dimensions of urban water security: drinking water, ecosystems, climate change and water-related hazards, and socioeconomic aspects (DECS). The integrated urban water security index (IUWSI) highlights the state of water security and intervention strategies in Madaba. The study reveals that urban water security in Madaba is satisfactory to meet basic needs, with shortcomings in some aspects of the DECS. However, Madaba faces poor security in terms of managing climate- and water-related risks. The IUWSI framework assists with a rational and evidence-based decision-making process, which is important for enhancing water resources management in water-scarce cities.
Achieving urban water security is a major challenge for many countries. While several studies have assessed water security at a regional level, many studies have also emphasized the lack of assessment of water security and application of measures to achieve it at the urban level.
Recent studies that have focused on measuring urban water security are not holistic, and there is still no agreed-upon understanding of how to operationalize and identify an assessment framework to measure the current state and dynamics of water security. At present, there is also no clearly defined and widely endorsed definition of urban water security. To address this challenge, this study provides a systematic approach to better understand urban water security, with a working definition and an assessment framework to be applied in peri-urban and urban areas. The proposed working definition of urban water security is based on the United Nations (UN) sustainable development goal on water and sanitation and the human rights on water and sanitation. It captures issues of urban-level technical, environmental, and socio-economic indicators that emphasize credibility, legitimacy, and salience.
The assessment framework depends on four main dimensions to achieve urban water security: Drinking water and human beings, ecosystem, climate change and water-related hazards, and socio-economic factors (DECS). The framework further enables the analysis of relationships and trade-off between urbanization and water security, as well as between DECS indicators. Applying this framework will help governments, policy-makers, and water stakeholders to target scant resources more eff ectively and sustainably. The study reveals that achieving urban water security requires a holistic and integrated approach with collaborative stakeholders to provide a meaningful way to improve understanding and managing urban water security.
Life cycle assessment is a crucial tool in evaluating systems performances for sustainability and decision-making. This paper provided environmental impact of integrating renewable energy systems to the utility-grid based on a baseline optimized energy production data from “HOMER” for renewable systems modelling of a site in northern Nigeria. The ultimate goal was to ascertain the best hybrid option(s) in sustaining the environment. Different assumptions and scenarios were modelled and simulated using Ganzleitlichen Bilanz (GaBi). Uncertainty analysis was ensured to the impact data based on pedigree-matrix and Excel-program, as well as overall policy relevance. The results of the impact categories revealed first scenario (i.e., conventional path-based) with the highest impacts on global warming potential (GWP), acidification potential (AP), human toxicity potential (HTP), and abiotic depletion potential (ADP fossils). The lowest impacts arise in
the renewable-based scenarios for all the considered categories except the Ozone-layer depletion potential Category where the highest contribution falls in the third scenario (i.e., photovoltaic (PV)/biomass-biogas system) although all values being infinitesimal. In quantitative terms, the reduction in the GWP from the highest being the first scenario to the lowest being the fourth scenario (i.e., wind/biomass-biogas system) was 96.5%. Hence, with the outstanding contributions of the hybrid renewable systems, adopting them especially the lowest impact scenarios with expansions is relevant for environmental sustainability.
Keine Software kommt heute ohne eine ausgebaute IT–Infrastruktur, mit der Anbindung an Datenbanken, aus. Die konsequente Ausrichtung der Software, aufgrund von technologischen Entwicklungen, ist ein wichtiger Einflussfaktor auf die Softwareentwicklung. Die Software soll sich durch Innovation, Flexibilität und Dynamik auszeichnen. Diese Diplomarbeit entstand aus der Motivation heraus, hier Abhilfe zu schaffen. Mit dieser Diplomarbeit soll bewiesen werden, das es möglich ist, die zugrundeliegende Datenbasis von herkömmlicher Dateiorganisation auf relationale Datenbanksysteme umzustellen, ohne dabei die komplette Software neu zu schreiben.
Digitale Medien sind fester Bestandteil der Lebenswelten von Kindern und Jugendlichen. Sie wachsen in eine Medienwelt hinein, in der digitale Technologien allgegenwärtig und selbstverständlich sind. Junge Menschen gelten daher als Digital Natives („Digitale Einge-borene“). Dennoch brauchen sie pädagogische Unterstützung, um souverän mit Medien umgehen zu können. Denn die informell erworbenen Fähigkeiten sind oft nicht ausrei-chend, um als kompetentes Medienhandeln gelten zu können. Dabei lässt sich gerade für die Adressat*innen der stationären Erziehungshilfe ein deutlicher Mehrbedarf in der Ausbil-dung von Medienkompetenz ausmachen, da für sie keine angemessene Medienerziehung in der Herkunftsfamilie vorausgesetzt werden darf. Doch in der stationären Kinder- und Jugendhilfe sind digitale Medien und Medienerziehung bisher eher vernachlässigte Themen.
Mithilfe einer quantitativen Befragung von knapp 200 Fachkräften zur Praxis der Medien-ziehung in Einrichtungen der stationären Erziehungshilfe in Deutschland wird dieses bisher wenig erforschte Feld genauer beleuchtet. Im Fokus stehen dabei die eigene Medienkom-petenz, medienbezogene Einstellungen, Qualifikation und Fortbildungsengagement der Fachkräfte sowie die Rahmenbedingungen der Einrichtung und medienerzieherischen Tä-tigkeiten im Arbeitsalltag. Wie die Analyse zeigt, erkennen die meisten Fachkräfte die Be-deutung der Medienerziehung in stationären Hilfen durchaus an, es besteht jedoch ein ho-her Informations- und Fortbildungsbedarf der Fachkräfte rund um medienpädagogische Themen. Denn nur etwa die Hälfte der Befragten hat im Rahmen ihrer beruflichen Ausbil-dung medienpädagogisches Wissen erworben; ein Großteil hat zudem keine entsprechen-den Fortbildungen absolviert. Fehlende medienpädagogische Konzepte sowie die häufig mangelhafte und veraltete technische Ausstattung in den Einrichtungen erschweren die medienerzieherische Praxis der Fachkräfte zusätzlich.
Illegal Gold mining and water quality. A case study of River Offin in the Central Region of Ghana
(2018)
Ghana as a country in the west of Africa is naturally endowed with many rich natural resources some of which includes; Gold, diamond, bauxite, manganese, cocoa, etc. Currently, it’s the second leading producer of gold production in Africa after South Africa. Gold production has produced a lot of benefits to the nation but at the same time contributed to many negativities ranging from pollution (water and air), land degradation, ethnic conflicts and deforestation. Industrial gold mining itself was never a big issue that caused any panic in the country till illegal gold miners “Galamseyers” also commenced operating. The sole objectives of this research were to determine the level of some specific heavy metal (Mercury, Lead, Arsenic and Zinc) concentrations within the Offin River in Dunkwa-on-Offin, Buabenso, Ayanfuri and Nkotumso. Results after the research revealed that, Ayanfuri recorded the highest level of concentrations. Nkotumso followed in that order before Buabenso with Dunkwa-on-Offin recording the least concentrations. It also became clear later that, even though the degree of intensiveness of the illegal mining “Galamsey” operations could have been a main factor for the increased concentrations, another finding was that, towns or communities that recorded higher concentrations throughout the study also showed to be towns that made use of inorganic fertilizers on its farms. The Minerals and mining Act 2006 of Ghana was then analyzed and conclusion was that, though the country has very strong policies regarding illegal mining termed “Galamsey”, there seemed to be institutional loop holes that have not been strong enough to combat illegal mining in the country. In recommending policy directives to improve the river quality, six (6) institutions including the Ministry of Lands and Natural Resources, Ministry of Environment, Science and Technology(MEST), Minerals Commission of Ghana, Environmental Protection Agency, Forestry Commission and the water Resources Commission were identified with detailed recommended roles clearly spelt out for each institution.
Ghana’s timber industries have traditionally focussed on certifying international demand (exports) to the detriment of domestic wood consumption. The legal wood supply to the domestic market has become insufficient to satisfy the growing needs of the local population. This research aims at gaining greater insight into the sources of wood supply to Ghana’s domestic wood markets focusing on the contribution of legal wood by the mainstream timber companies.
The study used random and purposive sampling techniques for selecting the respondents in the domestic wood market, wood producers as well as consumers. Additionally, the views of the respondents were sought through well semi-structured questionnaires. On the other hand, views from key informants, mostly experts, and regulators in Ghana’s wood industry were solicited through interviews.
The result indicates that the formal timber processors supply 73% of their processed lumber to the export market and 27% to the domestic market. The destination of the 27% is both the domestic market and other lumber demanded sectors especially large scale construction and furniture companies. The carving industry on other hand obtains wood directly from the farmers and not necessary from the domestic wood market. At the domestic timber market, dealers receive lumber supply from both formal (16. 7%) and informal (83.3%) sources.
The domestic wood sector provides livelihood support to both wood dealers, consumers as well as artisans. About 70% of respondents (wood dealers) used in the survey have no other source of livelihood for existence except wood business.
Owing to the immense contribution of the domestic wood market to the country’s economy and developmental agenda, a calls for policy review especially 20% supply of formal processed lumber to the domestic market is timely. Additionally, looking at the various interventions to curtail illegal chain saw and the continued market demand, the study believes more regulated measures will better help the nation to grasped huge revenue lost as a result of illegalities to embark on vigorous afforestation programs to sustain the domestic wood market.