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Qatar Foundation Annual Research Forum Volume 2013 Issue 1
- Conference date: 24-25 Nov 2013
- Location: Qatar National Convention Center (QNCC), Doha, Qatar
- Volume number: 2013
- Published: 20 November 2013
301 - 320 of 541 results
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Monitoring efficiency: Metrology systems for temperature dependent semiconductor characterization
More LessSince more than two decades Fraunhofer IPM works on metrology systems for semiconductor characterization. The physical transport properties and their determination are fundamental for the development and improvements of semiconductors regarding solar and thermoelectric applications. Therefore special designed setups for temperature dependent measurement of Hall-coefficient, charge carrier concentration and mobility as well as Seebeck-coefficient, electrical and thermal conductivity were developed and high accuracy reached. A wide range of metrology systems have been developed to measure thin films as well as bulk samples over a broad temperature range from below 100 K to over 1000 K. In this presentation we will show the interplay of these transport parameters and the critical influences regarding their determination. In closed collaboration with national and international metrological instituts Fraunhofer IPM developed a standardized measurement method[1] as well as reference samples for the so called power factor, a number for the conversion efficiency of thermoelectric semiconductor materials. These efforts will also presented.
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Smart grid opportunities for Qatar
More LessSmart Grid Opportunities for Qatar Summary Smart grid is defined as the next generation of the electricity grid that meets the following objectives (according to a recent NETL study funded by the DOE in the USA): * Enabling informed participation by customers * Accommodating all generation and storage options * Enabling new products, services, and markets * Providing the power quality for the range of needs in the 21st century economy * Optimizing asset utilization and operating efficiently * Addressing disturbances through automated prevention, containment, and restoration * Operating resiliently against all hazards. This paper will explore each of the above objectives focusing on some generic technical issues and challenges, as well as some specific circumstances defined by geopolitical and strategic Qatar enablers. The generic technical issues will focus on the technology, new applications and implementation issues related to smart grid solutions. The technology discussion will focus on advanced sensors, communications, data processing, and visualization solutions that are relevant to the new smart grid applications. Topics that will be discussed are big data and their role in smart grids, as well as the importance of cloud computing and pervasive web applications. Special attention will be placed on the issues of interoperability and standardization. The discussion of applications will be related to advancements in outage management, asset management and demand side management. The implementation issues will focus on the IT infrastructure, availability of good power system models, and future trends in EMS/DMS deployment. Special attention will be placed on the cyber-physical security and privacy issues in smart grid deployments. The specific Qatar circumstances that will be of interest are the ability to exploit the solar energy and to introduce large scale use of electrical vehicles, as well as an ability to provide hardened power grid for ultimate reliability and security of power supply to the end customers. Integration of such solutions into the existing power grid in Qatar will also be discussed. The research issues that need to be pursued to better understand circumstances of how to get the best use out of such advanced technologies will be the final point of the paper. The paper will end with some examples of smart cities developed around the world to offer an inspiration about possible smart grid projects in Qatar. Examples of recent developments in the USA, Europe and the Far East (Korea, Japan and China) will be mentioned as examples. The need to define unique Qatar approach to the smart grid development will be emphasized at the end.
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Reduced switch count asymmetrical flying capacitor multi-level inverter for variable speed drives application
By Atif IqbalThis paper discusses a reduced switch count topology of multi-level three-phase voltage source inverter for variable speed drive applications. In the investigated topology, the number of power switching devices and the number of capacitor/neutral voltage clamping devices are drastically reduced when compared with the existing Neutral Point Clamped (NPC), Flying capacitor (FLC) and Cascaded H-bridge (CHB) multilevel solutions. The number of devices for different types of inverters are shown in Table 1. The number of devices is reduced more when number of output level is increased. The converter configuration is proposed in the literature for seven-level and thirty-one level single-phase output and named as asymmetrical flying capacitor or Packed U cell (PUC) inverter. The same concept is extended in this paper for three-phase output and for variable speed drives application. The emphasis is placed in the development of three-phase seven-level voltage source inverter with asymmetrical flying capacitor configuration. The number of power semiconductor switching devices used in the proposed topology is only 50% of the number used in conventional NPC/FLC/CHB. Hence there is a saving of 50% in number of devices. The proposed solution offers transformer-less topology with reduced dv/dt and reduced switching losses. Modeling, simulation, control and implementation is conducted and reported in this paper. The developed model is validated using Matlab/Simulink simulation and experimentally verified. Simple multiple carrier-based Pulse Width Modulation techniques (PWM) is employed. Unlike the NPC inverter, this topology does not require any clamping diodes and is also free from issues like neutral point fluctuations. A carrier based PWM technique combined with a PI controller for balancing of the capacitor's voltages is used for the control of the seven-level inverter. Here balancing is in the sense that the voltage across the clamping capacitor is to be maintained at 1/3rd of dc link voltage. The major disadvantage of the proposed topology is the requirement of isolated dc supplies. The problem may also arise in case of dc link voltage unbalance. The electric drive system employing the proposed inverter topology find application in high power ac drives such as in oil & gas industries, electric/hybrid electric vehicles, ship propulsion, traction etc.The proposed topology is shown in Fig. 1 and sample simulation result is presented in Fig. 2. The detailed results and theoretical analysis will be reported in the full paper. The results will also include the effect of unbalanced dc link voltage.
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Regional hydrodynamic modelling for environmental impact assessment due to desalination plants of Qatar
More LessDesalination of Arabian Gulf is intense. But the environmental issues as not yet addressed on regional scale. Key issues are the concentrate and chemical discharges to the marine environment, the emissions of air pollutants and the energy demand of the processes. For sustainable use of desalination technology, the impacts of each major desalination project should be investigated and mitigated by means of a project- and location-specific environmental impact assessment (EIA) study and long term impact based on the global climate change. In this context, this study is aimed to address the impact of desalination with global climate change on a regional scale. A hydrodynamic model covering the Arabian Gulf driven by Arabian Sea tidal levels was setup to establish the hydrodynamic condition of the Gulf. The model was driven with level and velocity components from the global tidal model TPXO. The results are compared with the predicted tides from ATT (Admiralty Tide Table) of standard ports as well as secondary ports and available tidal streams at the Diamond Points. This is an attempt to make a calibrated working model that drive the coastal Qatar hydrodynamic model which ultimately drive dispersion model with long term climate parameters to assess the impact of climate change on the dispersion of concentrated brine. The model validity compares well with the ATT predicted tides and tidal steams of Admiralty Chart No. 3787. The regional model is shows very good agreement on predicted tides along the regional model and velocity vectors at the admiralty diamonds on chart. Free surface of the model was compared with the ATT predicted tides at ports Mesaieed, Al Wakra, Doh, ras laffan, Jabal Al Fuwarit, mina salman, MINA Saud, Khowr E Musa Bar, Bharder E Shaid Rajai and Port sultan Qaboos. As the bathymetry and coastline near south east part of Qatar were not well resolved, model comparison could not be carried out at this site. The model was run with an updated bathymetry from the navigational charts to resolve the tides of coastal Qatar. Except at Al Wakra, the predicted levels were in good agreement with the model results. Tidal streams on BHO Chart No. 3787 were also compared against the model velocities during spring and neap stages of the tide. The velocity values obtained from Admiralty Diamonds during spring and neap tides are based on very short-term observations. Since the estimates are based on data collected during different periods, it could be used as an estimate of the tidal currents only in the absence of other data. Comparisons between model current speeds and BHO chart values of tidal streams indicate good matching during spring tides while during neap tides the model over-estimates the current speeds at all Diamond points. Variations in tidal current velocities between peak flood and peak ebb at different parts of the gulf convincingly indicate diurnal reversal of the tidal streams.
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A wind turbine emulator system
More LessThis paper aims to provide an in-depth overview of all the findings presented in recent research papers available on wind turbine emulation design methodologies. It discusses about the existing possibilities for developing the emulator and ultimately uses the suitable method for building a wind turbine emulator keeping all those issues discussed in previous research papers in mind. A wind emulator system is developed to investigate the wind energy generation system at laboratory scale i.e. instead to an actual wind turbine and generator, an emulator is built to emulate the identical characteristics. An emulator system consist of wind turbine model, wind generator model and control system. Maximum power point tracker is employed to extract maximum available power from the wind turbine. A study of the state-of-the-art indicates that most prior efforts involved maximum power point tracking (MPPT) control strategies, generator torque control, blade pitch control system and rotational speed control. This paper presents the maximum power point tracking process which tracks one maximum power point from turbine input, varying the ratio between the voltage and current delivered to get the most power out of it. Of all the MPPT algorithms, incremental resistance (INR) control algorithm with boost converter has been used for simulating the wind turbine system. The development of simulator involves simulation of the designed control system using MATLAB/SIMULINK software and then laboratory implementation. The model on SIMULINK consists of wind turbine module, wind alternator, MPPT controller circuit, PWM signal generator circuit, boost converter and resistive load. In laboratory implementation, a microcontroller will be used for wind turbine characterization, MPPT control and PWM signal generation for more efficient and lower cost system development. The proposed topology is shown in Figure. 1 and sample simulation result is presented in Figure. 2. The detailed results and theoretical analysis will be reported in the full paper.
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Advanced passive technology for water saving, sustainable food supply, and comfortable urban space
By Mario GrossoThe advanced technologies presented in this paper are based on a low-environmental-impact, energy-saving,and health-fostering approach, able to fit to the extreme climate and environmental conditions of Qatar. They are addressing 3 of the 12 Cross-cutting Grand Challenges within the Energy and Environment thematic pillar. 3. Sustainable food supply: c (Explore the feasibility of hydroponic, aeroponic and new greenhouse technologies). The advanced technology proposed is applied to a greenhouse which is able to grow hydroponically fresh vegetables in the desert under extremely controlled conditions taking care of water, air, waste management and energy production. Based on previous aerospace experience, the greenhouse proposed is something that surpasses the current state of the art: the energy production for all the hydroponic greenhouse facility is ensured by the use of flexible and transparent solar panels which allows for solar light to illuminate the hydroponic cultures; simultaneously electricity is produced by an integrated PV system made of high-tech conductive polymers embedded inside the plastics of the external walls of the greenhouse. 1. Water reuse: f (Develop and adopt safe and efficient methods of wastewater reclamation and reuse). The water for the alimentation of the hydroponic cultures will be used in closed circuit avoiding losses through a constant monitoring of its key parameters. A series of ion-selective electrodes connected with microelectronic hardware, follows through metering pumps the concentration of nutrients in the water to integrate those depleted during the circulation. Water circulation in the hydroponic culture implies also its enrichment by metabolites such as oxalic acid coming from plants, and the water can accumulate and grow undesired micro-organisms which can build up undesired and noxious biofilm or which could be dangerous for the plants. To eliminate these risks, a patented in-house technology permits to destroy selectively the undesired metabolites released by the plants using the photo-ozonolysis treatment, which not only destroys metabolites like oxalic acid converting them into CO2 and water, but destroys completely all noxious micro-organisms which may grow in the hydroponic water, preventing the undesired bio-film to build-up. 5. Sustainable Urbanisation - Doha as a smart city: d (Develop state-of.the-art technologies in infrastructure systems and materials unique to Qatar but adaptable to global industry) and i (Design and build environments that foster healthy behaviours). A technological transfer from the above-described systems to the thermal mitigation of urban confined spaces is envisioned in this third part of the presented proposal. The greenhouse selective solar ETFE envelop can be applied to outdoor confined spaces in order to realise thermal comfort conditions inside through solar radiation control. The close circuit water pump system is used to sprinkle water from the ceiling of the envelop inducing passive down-draft evaporative cooling. The aeroponic technique allow for vertical vegetation growing on the facades of buildings which become the inner walls of the outdoor confined spaces, thus increasing the cooling effect by transpiration and low-emissivity irradiation. In addition, ground cooling is applied to inlet naturally cooled air from floor vents connected to serpentines of buried pipes under the urban space pavement.
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Isolation and characterization of fungal pathogens causing date palm black scorch and false smut in Qatar
More LessIsolation and characterization of fungal pathogens causing date palm black scorch and false smut in Qatar Fatima A. Al-Naemi1, Resna K. Nishad1, Talaat A. Ahmed1 and Osman Radwan2 1Department of Biological and Environmental Sciences, College of Arts and Sciences, Qatar University, Doha, Qatar 2Department of Natural Resources and Environmental Sciences, University of Illinois at Urbana-Champaign, IL, USA The ability of date palm (Phoenix dactylifera L.) to grow in hot and dry regions of the world makes it an important subsistence crop in most arid areas. Nevertheless, the conditions for date palm growth and production are optimal for some fungal diseases that cause significant yield loss. In Qatar, fungal diseases affecting the productivity of dates are black scorch, which is caused by necrotrophic fungal pathogen, Thielaviopsis punctulata and false smut, which is caused by biotrophic fungal pathogen, Graphiola phoenecis. This study aims to ultimately reduce the yield loss attributing to palm diseases by increasing our knowledge about pathogen, host, host-pathogen interactions and the factors that alter disease severity. In order to isolate and identify these two fungal pathogens, infected date palm samples were collected from 8 agricultural farms located in northern and southern Qatar and the fungal pathogens were isolated. Microscopic examination and physiological characterization revealed that T. punctulata (anamorph of Ceratocystic radicicola) is the causal fungal pathogen of black scorch disease. Although previous reports have showed that the closer species, Thielaviopsis paradoxa, as the causal agent of this diseases; this is the first report from Qatar demonstrated the involvement of T. Punctulata in black scorch disease. To examine the pathogenicity of this fungal pathogen, date palm healthy tissues, were infected by the pathogen and typical disease symptoms manifested within two weeks. On the other hand, characterization of the false smut disease showed yeast-like fungal colony reflecting the hallmark of Graphiola phoenecis. Molecular characterization of the isolated fungal pathogens is being performed by using sequences from the ribosomal region spanning internal transcribed spacers region 1 and 4 (ITS1 and ITS4). Additionally, real-time RT-PCR is being conducted to early identify the most important pathogens of date palm. Information from this study will help scientists to design effective strategies in controlling date palm diseases. Keywords: date palm, black scorch, false smut, Thielaviopsis punctulata, Graphiola phoenecis
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Viability Test For Wild Plants In Qatr
More LessAbstract: Preservation seeds of wild plants for longest period with high viability is a great challenge in gene bank. Germination test is one of seed viability tests methods to determine percentage of seeds in an accession will germinate under favorable conditions and generate normal seedlings capable of development into reproductively complete plants. Different methods have been developed successful to determine germination of seeds especially for endanger and rare species. Germination test is an important factor in order to determine the ability of seeds to be preserved in gene bank for long term. This study showed initial germination of some wild plants which collected from wild habitat and were processed for ex-situ conservation in short-term conservation and long-term conservation units at plant genet resources unit. Seed germination tests were carried out in seed viability unit, under favorable environmental conditions for each species. The aim of this work was to evaluate the seeds germination in the first stage of ex-Situ conservation processing. Seeds were collected according to the principals and guidelines of plant genetic resources collections set by Biodiversity International and international gene banks. The germination tests process according the international conservation rules, and International Seed Testing Association. Results showed that some species gave highly germination percentage without any treatments for example: Anastatica hierochuntica (100%), Lycium shawii (85 %), Ochradenus baccatus, (65%), Blepharis edulis (70%). On the other hand other species gave low germination percentage for example: Acacia ehrenbergiana (41%), Prosopis juliflora (50%) and Citrullus colocythsis (0%). Key words:Viability, Seeds, Germination, Wild plants, Gene Bank, Qatar.
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Predicting offshore oil and gas pipelines condition
More LessCrude oil and gas products transported using pipelines systems is safe and economical all over the the world. Nonetheless, such pipelines can still be subject to various degrees of failure and degradation generating hazardous consequences and severe environmental damages. As a result, it is important for these pipelines to be effectively monitored and assessed for optimal operation. Many models have been developed to predict pipeline failures and conditions. However, most of these models were limited to use corrosion features as the only factor to assess the condition of pipelines which can lead to inaccurate condition prediction. Therefore, the main aim of this paper is to develop models that predict the condition of offshore oil and gas pipelines based on several other factors including corrosion. Regression analysis and artificial neural network (ANN) techniques were used to develop condition prediction models based on historical inspection data of three existing pipelines in Qatar. In addition, a condition assessment scale for pipelines was built based on experts' opinion. All necessary statistical diagnosis have been checked showing sound results for the developed models. The models have been validated and the results showed their robustness with an average validity percentage from 96 to 99%. The models are expected to help pipeline operators to assess and predict the condition of existing oil and gas pipelines and hence prioritize their inspections and rehabilitation planning.
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Energy Efficient Cross-Layer Design For Wireless Body Area Monitoring Networks
More LessThe rapid increase in the number of patients with chronic diseases requiring constant monitoring has created a major impetus to developing scalable Body Area Sensor Networks (BASNs) for remote health applications. In this paper, to anatomize, control, and optimize the behavior of the wireless EEG monitoring system under the energy constraint, we develop an Energy- Delay-Distortion cross-layer design. This cross-layer design aims at minimizing the total energy consumption subject to data delay deadline and distortion threshold constraints. The source encoding and data transmission are the two dominant power consuming operations in wireless EEG monitoring system. Therefore, in the proposed cross-layer design, the optimal encoding and transmission energy are computed to minimize the energy consumption in a delay constrained wireless BASN. This cross- layer framework is proposed, across Application-MAC-Physical layers, under a constraint that all successfully received packets must have their delay smaller than their corresponding delay deadline and with maximum distortion less than the application distortion threshold. In addition to that, to decrease the computational complexity, a distributed algorithm that finds the optimum encoding and transmission parameters for each sensor node is proposed.
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Design Of Shunt Active Power Filter For 3X5 Matrix Converters To Eliminate Harmonic Distortion In Input Current
By Moidu ThavotThe matrix converters are silicon based converters without bulky and expensive DC link capacitors other than its counterpart voltage source inverter (VSI) converters as an ideal voltage source and feed to ideal current source. Power electronic converters are a typical source of harmonic currents and during each switching cycle, the matrix converters produce unwanted harmonics and this will inject back to the AC mains. This harmonic current effect the overall operations of an AC supply. The main approach to the mitigation of this power quality problem is providing a filter in input side of the converter. Conventionally, passive filters with LC component were the choice for the elimination of harmonics and to improve power factor. These passive filters have the disadvantages such as large size, series and parallel resonance and fixed compensation. Active filters avoid the disadvantages of passive filters by using a switch mode power electronic converter to supply harmonic currents equal to those in the load currents. Active power filters can compensate both harmonic and reactive power simultaneously. In design of an active filter for matrix converter, a high displacement angle of input line current may compensated by matrix converter itself setting as reference for the input current a lagging displacement angle. It makes the reduced voltage transfer ratio for the system. So the control of the impedance interaction between the input filter and the voltage converter is mandatory. This paper propose a shunt active power filter for a 3x5 matrix converters to eliminate harmonic currents and to compensate reactive power for linear and non-linear loads. The paper presents the various design aspects of shunt active power filter for a 3x5 matrix converter. The control logic is made by using p-q theory and calculated the reference currents in order to compensate zero, harmonic and reactive currents (Fig. 1). To validate the proposed filter design, matlab simulation tests are conducted and results are presented. Simulations are carried out for the RL load and analysed the output with and without filter. These results shows less harmonic distortion in input current as well as reduced total harmonic distortion by using a simple active filter in input side. This proposed methodology has good results as compared with the conventional input filter. Fig. 2 presents simulation results of 3x5 matrix converter without any input filter. 80% of total harmonic distortion (THD) is reduced after accommodating an active input filter in to the same system (Fig.3).
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Five-Phase Sensorless Induction Motor Drives With Lc Filter For High Power Applications
More LessMulti-phase IM drive systems are nowadays seen as a possible alternative to the three-phase drives due to their features that are especially suited for high power applications such as Oil & Gas industries, electric vehicles, traction drive, ship propulsion, robotics and mining and huge number of application. The main advantages of the multi-phase machines are higher power density with reduced volume, lower torque pulsation at higher frequency, lower dc link current harmonics and lower noise and keep going. This fault tolerance capability of the multi-phase machines makes them highly attractive for safety critical applications listed above. The trend in the drive industry is to employ sensorless topology to make the system more reliable, robust, lower hardware count, reduced cabling, reduced cost and less maintenance. The purpose of this project is to design and develop five-phase speed sensorless induction motor drive system with inverter output LC filter. The drive system are supplied using PWM voltage source inverter and the growing switching speed of IGBTs pose additional problem of high dv/dt. The high dv/dt of the inverter output leads to several problems in the drive systems such as doubling of motor applied voltage (especially for drive with long cable), high voltage stress on motor, leakage and bearing currents leading to the bearing failure and high electromagnetic interference (EMI) etc. To mitigate these issues particularly passive filters are used. This paper focuses on using an LC filter at the output of the five-phase inverter. This paper investigate the design issues of output LC in conjunction with five-phase drive system. The LC filter causes delay and phase shift in the output voltages that affect adversely the motor control especially in sensorless vector controlled drive system. The presence of LC filter is to be incorporated in the speed estimator system. Hence the modification is necessary in the control structure. The effect of inverter output LC filter on the behavior of a sensorless vector controlled five-phase induction motor drive system investigated in this paper. Modification in the control structure and algorithm will be implemented. The whole approach based on theoretical study, simulation verification and experimental implementation. The work on existing Five-phase induction motor drive system at QU. The effect of LC filters on long cable length drive system and the use of composite type of filters will be evaluated in future project cycles.
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A study at the GCC power grid with the STATCOM tailored application to the network in between Bahrain & Qatar
By Tariq MasoodThe GCC region has become a hub of major economic growth in the world. It is providing financial support and incentives to the GCC countries. Hereby, it has witnessed population growth and large scale industrial activities in the GCC countries. This has led to increased demand for electricity. Current demand for GCC power consumption is about 60 GW and it is projected that it will reach 180 GW within next 25 years. In order to maintain a reliable, sustainable, and well controlled power transfer between the GCC countries. FACTS controllers are, therefore, strong candidates' technology options. This paper presents a non-traditional control and operation of a STATCOM connecting Qatar and Bahrain in the Gulf Cooperative Council Interconnection. The primary aim of this work is to address the transmission system operational challenges by implementing advance transmission technologies. This study indicates that the STATCOM device will provide proven technical solution to address these operating challenges being presented in between Qatar and Bahrain at the GCC power grid. Hence, the STATCOM device allows for improved and sustainable power transmission system operations with degree of precision. The main benefit of the STATCOM device is to provide the 'cycling per repeatability' during reactive power compensation and ensure a smooth control that comprises power electronics based switching. The STATCOM device has a strong positive impact to improve voltage quality and power system stability in between Qatar and Bahrain. This has been selected by using Wideband Delphi technique. It has also a positive impact on infrastructure investment, environment and implementation time compared to the construction of new lines. The simulation results demonstrate precisely STATCOM control parameters, improving the power transmission system performance at different transmission system's contingencies. These results are clearly shown an increase of the loadability, reduction of the losses and enhancement of the sustainability in the GCC Interconnection. This is divided into two basic segmental links, neighboring to neighboring and common-link topologies. Firstly, Oman and UAE are interconnected through neighboring to neighboring control topologies. Secondly, Qatar, Bahrain, KSA and Kuwait are interconnected through common-link control topology and this is also known as the Northern System. In the third stage common-link topology demonstrates UAE national grid and Oman northern grid interconnection; this is known as southern systems. Thirdly, southern and northern power systems are connected through hybrid link control topology. In this study a STATCOM's three control limits have developed and synthesized at (minimum (+/-) medium (+/-), and maximum (+/-) compensation. These control limits are adjusted by configuring their corresponding PI control values by using D.J. Cooper PID control Technique for (1)Increased Power flow (2) Improved reliability & controllability (4) Enhanced angle and voltage stability. Fig.1 illustrates the designed power exchange in between GCC countries and Fig.2 shows an inter-tie connection in between the GCC countries. Fig.3.Wideband Delphi Process Flow Diagram Fig.4. Wideband Delphi repeated process Fig.5 shows the network without STATCOM. Fig.6 shows the STATCOM impact on GCC power grid. Fig.7. Transfer functions of the PI compensator. Fig.8. indicates the PI control values
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Modification of wood by radio-frequency discharge plasma
By Igor NovákMODIFICATION OF WOOD BY RADIO-FREQUENCY DISCHARGE PLASMA aIgor Novák1, a,bAnton Popelka1, aMarian Valentin, aIvan Chodák1, a,cIgor Krupa dVladimír Vanko, dJozef Preťo aPolymer Institute, Slovak Academy of Sciences, Bratislava, Slovakia bCenter for Advanced Materials, Quatar University, Doha, Quatar cCenter for Advanced Materials, QAPCO Polymer Chair, Quatar University, Doha, Quatar dVIPO, Partizánske, Slovakia Email: [email protected] Abstract The modification of wood surfaces is of considerable interest with the respect to construction of the strongest wood adhesive joints. Great efforts have been made in developing various kinds of furniture using wood or plastics veneers in adhesive joints wood-adhesive-veneer. The radio-frequency (RF) discharge plasma is currently an efficient method for modification of surface and adhesive properties of wood, and is considered as the 'green' ecologically friendly method. For a common industrial wood application various woods have to possess a large set of various surface characteristics, including polarity (hydrophobicity or hydrophilicity), dyability, scratch resistance, tailored adhesive properties, antibacterial resistance etc. In experimental work we have been focused to study of surface and adhesive properties of beech (Fagus sylvatica) wood modified by RF-discharge plasma. There are two reasons why in the case of wood to apply discharge plasma modification. Firstly, discharge plasma in air itself significantly increases hydrophilicity of the wood, because of formation various polar groups (e.g. hydroxyl, carbonyl, carboxyl, etc), and, the wood macromolecules are also cross-links (up to a few microns) what leads to the increase in scratch resistance and to the improvement in barrier properties of the wood material. Second reason for the plasma use is an increase of adhesion in adhesive joint between wood substrate, that is important for industrial applications. The contact angle of re-distilled water drop on the beech wood surface was measured immediately after drop deposition. The contact angles showed a steep decrease from 66 deg (pristine sample) to 40 deg after 120s activation of wood by RF plasma in air. The decrease of the contact angles of polar testing liquid (water) can be explained by an increase of the hydrophilicity of beech wood surface due to the treatment by RF plasma in air. The hydrophilicity of the surface depends on the formation of polar oxygenic functional groups on wood surface during the plasma modification in air. The surface energy and its polar component of beech wood increased with time of plasma activation. The surface energy of beech wood treated 120s by RF plasma in air increased from 66 mJ.m-2 (pristine sample) to 78 mJ.m-2, and the polar component of the surface energy increased from 17.4 (pristine sample) to 27.2 mJ.m-2 (120s). The shear strength of adhesive joint beech wood modified by RF plasma in air-epoxy adhesive vesrus activation time increased non-linearly from 5.2 MPa (pristine wood) up to 7.8 MPa (120s activation by CCRF plasma). Acknowledgements This contribution was supported by project No. 26220220091 by Research & Development Operational Program funded by ERDF, as well as the project „Application of Knowledge-based Methods in Designing Manufacturing Systems and Materials", project No. MESRSSR 3933/2010-1.
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Oil fingerprinting and its application in Qatar petroleum
More LessPetroleum Geochemistry is an established science to study the formation, migration, accumulation and alteration of petroleum. It is routinely applied to understand the exploration and recovery of oil and gas, both for "conventional" hydrocarbons as well as "unconventional" resources like shale gas. Due to its diverse origins and subsequent alteration processes during migration and accumulation processes, many hydrocarbons constitute of unique chemical components and markers that can be identified, a technique called Oil Fingerprinting. Routine applications of Oil Fingerprinting are: o solving reservoir production allocation o identify production from commingled reservoirs o connectivity/compartmentalization issues o identification of wellbore mechanical problems o characterization of reservoir bitumen and tar mats Qatar Petroleum Research and Technology Center (QPRTC) is in the process of establishing a state of the art geochemical laboratory to study and research Oil Fingerprinting applications. High Resolution Gas Chromatography (HRGC) is used to have a wide range (C1-C40) of chemical constituents of crude oil. The Multi Dimensional Gas Chromatography (MDGC) technique is used to separate a unique set of geochemical components sensitive for reservoir processes. QPRTC is now conducting research activities to support QP operations utilizing Oil Fingerprinting.
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Towards green / white mosque certification
More LessIn Qatar, more than 1000 mosques can be concerned by the results of this study to improve their energy performance, save energy and consequently reduce their environmental footprint Five mosques have been investigated and indoor environment have been monitored. There are compound mosques and large neighbourhood mosque. The measurements and interviews results indicate that thetemperature setting are adequate but can be slightly increased to save energy in cooling. The simulation study indicates that an energy saving of 30% can be achieved by optimizing the cooling setting time and an optimized insulation level.
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Identification of gender-associated molecular markers in the date palm (Phoenix dactylifera) genome
By Maria TorresDate palm (Phoenix dactylifera) is one of the most distributed and well-adapted fruit crops in the Middle East, and plays an important role in the history and diet of the Arab world. Dates constitute the primary exportable agricultural product in Qatar and current efforts are being made to improve its production. Over the years, clonal propagation has been used to maintain selected varieties with desirable morphological traits, leading to the establishment of uniform palm orchards. This, however, significantly reduces genetic diversity among palm plantations, making them potentially more susceptible to pests and diseases. Although research on date palm has increased over the past years, the genetic markers responsible for desirable agricultural traits, such as fruit color, fruit size, ripening time and gender remain unknown. In commercial plantations, one hundred fruit bearing female trees can be pollinated with a single non-bearing male tree. Still, half of the date palm offspring that is planted is expected to be male individuals. One of the biggest challenges that date production encounters is that female trees can only be distinguished after flowering, which occurs five to eight years after planting. Previous cytological studies have suggested the presence of heteromorphic sex chromosomes in date palm, however enzymatic approaches intended to anticipate gender determination have been unsuccessful. The recent genome sequencing of P. dactylifera in WCMC-Q, allowed the identification of a gender-linked genomic region. This single nucleotide polymorphism (SNP)-rich region was shown to segregate with gender, and is predicted to extend to 24 scaffolds. Only a limited amount of information about this region is currently available, and this study proposes the use of a deep-sequencing approach to significantly improve the date palm genome assembly, with an emphasis on the male/female segregating region. A bacterial artificial chromosome (BAC) library, with a 12x genome coverage and an average insert size of 125 Kb was constructed. BAC-end sequencing of at least 96 clones, associated with the polymorphic sex-linked region, will allow the generation of an optical and physical maps of the sex-determination region. This will be the first time that a full genetic map of a male/female region will be available for a plant. Our main goal is to ultimately generate molecular markers that have the potential to allow identification and selection of female trees before germination. Furthermore, standardization of this sequencing procedure, will also allow us to characterize other genomic regions associated with desirable commercial properties of these fruits. This in turn, will provide a valuable tool for the development of marker-assisted selection programs, for the improvement of date palm production.
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Clean development mechanism: An efficient instrument to reduce greenhouse gas emissions and ensure sustainable development in the Middle East.
By Remi PietThe 18th Conference of Parties to the United Nations Framework Convention to Climate Change has taken place in December 2012 in Doha and brought some fruitful results in defining the future climate regime strategy. The parties acknowledged that, during the first phase of the implementation of Kyoto Protocol from 2008 to 2012, there had been a number of truly important achievements, in particular in setting up mechanisms aimed at the reduction of emissions locally and involving strong participation of the private sector. The lessons learned in the first phase of 2008-2012 provide valuable pointers for the future and will hopefully make an even stronger contribution to sustainable development in the years to come. This article offers an overview of the international climate policy framework and analysis of the probably most successful and promising instrument - clean development mechanism (CDM) - that has really boosted clean technology transfer, sustainable development and climate change awareness in the Middle East over the last 5 years. This article also reviews the implementation of several Global Environmental Fund (GEF) projects on renewable energy technologies diffusion in Tunisia, Egypt and other developing nations. It specifically addresses the inclusion of private actors (banking sector, equipment producers, private developers) throughout the definition phases and implementation of the projects. This paper analyzes the compatibility of the stakeholders' interests and the adaptation of public regulations and mechanisms in developing a fertile framework for the creation of private initiatives. The choice of cases allows for the study of the most relevant set of domestic parameters (such as legal, political and cultural variables) to unsure the capacity building and sustained contribution of private actors. The author worked for the United Nations Environment Programme during the development of the initiative and introduces in this paper a range of theoretical and analytic tools to underline the success and shortcomings of public-private partnerships in environmental technologies diffusion programs The article concludes by extracting the best practices that provide insights on how to develop similar projects within the GCC in general and Qatar in particular. Analyzing the shortcomings of some of the projects and the achievements of most, it will provide leads as to the establishment of a framework of public policies and program developments that could serve as a relevant foundation for the sustainable development of the country and the region.
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Food Ecologies in Qatar. Interdisciplinary approaches to sustainable systems: Food prints, food chains & food urbanisms
More LessThe desert climate of Qatar presents numerous challenges to the sustainable and secure provision of food for its increasing number of residents. This research looks at how the producing of food can be implemented in a resource efficient and sustainable way, using systems thinking to maximize the quality and quantity of food produced and to minimize the energy and resources consumed. Approached from a spatial and urban design and planning perspective, this research looks at the different ways that Food Production can be integrated into the cities and landscapes of Qatar, both in new projects and in regeneration or retrofitting projects. The Method of research looks at international trends and case studies to see how they can be applied to the context of Doha and Qatar. The importance of systems thinking implies that the food product is evaluated and measured in its total chain, as well as the energy and resources consumed and recycled. Another important aspect, which complements the quantitative measures, is the quality of the food produced, and the quality of the urban landscapes that result from the implementation of edible plants and trees. Increasingly, we are becoming aware of the importance of pesticide and additive free nutrition and these new ways of producing food must also provide more harmonious environments and balanced diets. Results. A number of case studies developed with students in the Masters in Urban Planning Design at Qatar University developed scenarios to implement different food systems into the urban and architectural landscapes of Qatar, from individual gardens in compounds and villas to vertical farming in high rise buildings, and from University Campuses to reclaimed waste water ponds. Conclusions. New Food Ecologies for Qatar imply that we not only design our buildings and landscapes in new ways to integrate the production of healthy food and medicinal herbs, but that these new visible ways of nourishing the populations includes an embellished environment and a more aware and discerning approach to the consumption of food, in short, a more holistic relationship to what our bodies consume.
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Propagation of potential native plants for urban landscape in Gulf countries
By Arvind BhattGulf Countries have an arid/hyper arid climate with little precipitation, a low groundwater recharge rate and no reliable, perennial surface water resources. The total consumption of ground water resources in these countries exceeds with times its natural recharge capacity. However, urbanization expansion and the need for green landscapes in most of the Gulf cities increase the demand on the irrigation water. This puts great stress on the limited water resources in the Gulf Countries. One way for the sustainable use of the limited water resources is through the use of native desert plants in landscaping the cities. Native plants are those that have evolved naturally under the harsh environmental conditions of the GCC countries. They can tolerate very high temperatures, drought (water deficit) and high salinity. Native plants provide a beautiful, hardy, drought resistant, low maintenance landscape while benefiting the environment. Besides that they are adapted to the local climate, geography and hydrology and should require little or no fertilizers and water for growth and maintenance, given that native plants have adapted and evolved to local conditions over thousands of years. In addition, the beauty of native wildflowers and grasses creates a sense of place. The native plants increase our connection to nature and provide a beautiful place to relax. Native plants are also resistant to most kinds of local insects and resistant to most pathogens. Consequently, using native plants would reduce the use of the hazardous chemicals and hence save the environment in a sustainable way. In the present study, we screened more than 100 plants native to the GCC region to select the most potential in landscaping. Plants are selected based on their appearance, texture and tolerances to drought and salinity, fit as ornamental plants. Priorities are given for species that have wide ecological amplitudes. These species can tolerate wide range of environmental (especially soil factors) and hence would be more successful under new conditions in of the urban environment. The main challenge facing the use of native plants in landscaping is the great dormancy in their seeds, which results in very low germination rate. In addition, there is a lack of propagation information for most of the native desert plants used in the urban landscaping. Our results showed that large number of studied plants have little dormancy and can germinate in a wide condition of temperatures and light. However, many other potential plants have very deep dormancy. Treatments with different growth regulators, such gibberellic acid, kinetin and thiourea and fusicoccin are currently in progress to break physiological dormancy. Other treatments, such as sulfuric acid, are also carried out to break physical seed coat dormancy. In addition, seeds are stored under different conditions to break the morphological dormancy.
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