| 1. |
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| 2. |
- A.S.M. Monjurul, Hasan, et al.
(författare)
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Biogas potential from municipal and agricultural residual biomass for power generation in Hazaribagh, Bangladesh : A strategy to improve the energy system
- 2019
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Ingår i: Renewable Energy Focus. - : Elsevier BV. - 1755-0084. ; 29:June 2019, s. 14-23
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Tidskriftsartikel (refereegranskat)abstract
- Energy is considered as one of the significant benchmarks towards sustainable growth. Due to the recenteconomic growth, energy demand is increasing day by day in Bangladesh. The power generation mainlyrelies on fossil fuels though there are plans to increase the renewable energy share by the concernstakeholders. Considering the global warming, energy generation from renewable sources is consideredas a sustainable way to mitigate the anthropogenic emission. This study, therefore, addresses thepotentiality of biogas production from municipal waste and agricultural residues in a city territory ofDhaka namely Hazaribagh. The potential sources include wastes from two markets, six slaughterhouses,domestic wastes, one poultry farm and three croplands. The calculations made in this study to estimatethe amount of biogas and electricity from the described sources are done in a simple way, just to illustratethe potential. This study suggests that there is a good potentiality of biogas production and electricitygeneration from municipal wastes and agricultural residues of Hazaribagh. Moreover, this study alsomentions the significant actors like government, future owners, people and so on that are needed to beincorporated to implement biogas solution in a city territory.
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| 3. |
- Aaboen, Lise
(författare)
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BATON-CHANGING ON EGGSHELLS – TRANSFERRING SUPPLIER RELATIONSHIPS WHEN MOVING PRODUCTION
- 2014
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Konferensbidrag (refereegranskat)abstract
- Production transfers are a result of outsourcing and offshoring decisions. Though, because ofthe strategic focus of the outsourcing literature have not the operational issues of howrelationship development between sender, receiver and raw material been fully depicted. Thepurpose of the present paper is to explore relationship development connected to transfer ofraw material supplies responsibility during transfer of production. To fulfil the purpose, fourdifferent production transfers were studied: three from Sweden to China, Romania andHungary respectively and one transfer from Holland to Sweden. We can see that thedependence and power shifts gradually between the sender and the receiver and therelationship between them sets the arena for what relationship is developed between thereceiver and the raw material suppliers. Furthermore, short social distances can over bridgecultural and technological distances to some extent, because it motivates to take therelationship into a more developed state.
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| 4. |
- Aaboen, Lise, et al.
(författare)
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The relationship development aspect of production transfer
- 2016
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Ingår i: Journal of Purchasing and Supply Management. - : Pergamon Press. - 1478-4092 .- 1873-6505. ; 22:1, s. 53-65
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Tidskriftsartikel (refereegranskat)abstract
- Production transfers are a result of outsourcing and offshoring decisions. Because of the strategic focus of the outsourcing literature, the operational issues of relationship development between sender and receiver and its impact on the transfer progress have not been fully depicted. The purpose of the present paper is to explore relationship development during production transfer. To fulfil this purpose, we studied three different production transfers and derived four propositions for further testing. Our main conclusions included that dependence and power gradually shift between the sender and the receiver and that the relationship between them sets the arena for what types of relationships can be developed between the receiver and the suppliers. Furthermore, short social distances can bridge cultural and technological distances to some extent, because it motivates the actors to bring their relationship into a more developed state. Finally, we noticed that the headquarters’ involvement can work both as an inhibitor as well as a converter.
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| 5. |
- Aamir, Syed Ahmed, 1980-, et al.
(författare)
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A 1.2-V pseudo-differential OTA with common-mode feedforward in 65-nm CMOS
- 2010
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Ingår i: Proceedings of the 17th IEEE International Conference on Electronics, Circuits, and Systems. - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 29-32
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Konferensbidrag (refereegranskat)abstract
- In this work, we describe the implementation of a 1. 2-V pseudo-differential operational transconductance amplifier (OTA) with common-mode feedforward (CMFF) and inherent common-mode feedback (CMFB) in a 65-nm, digital CMOS process. The OTA architecture provides an inherent CMFB when cascaded OTA structures are utilized andthis work has studied a cascaded amplifier consisting of fourstages. Due to the low-gain using core 65-nm circuit devices, the overall gain must be distributed on all four stages to acquire a gain of more than 60 dB, while maintaining a-3-dB bandwidth of 200 MHz. To achieve high gain, we propose using a modified, positive-feedback, cross-coupled input differential stage. The modified OTA achieves a high output swing of ± 0.85 V due to only two stacked transistors, 88 dB DC gain and a third-order harmonic of -60 dB for 800 mVpp at 30 MHz. Further on, in a capacitive buffer configuration, we achieve a high slew rate of 1240 V/µS, -3-dB bandwidth of 509 MHz, signal-to-noise ratio of 63 dB while consuming 10.4 mW power.
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| 6. |
- Aamir, Syed Ahmed, 1980-, et al.
(författare)
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A 500-MHz low-voltage programmable gain amplifier for HD video in 65-nm CMOS
- 2010
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Ingår i: Proceedings of 28th IEEE Norchip Conference., NORCHIP'10. - Tampere : www.ieee.org. - 9781424489718 - 9781424489725 ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- This work describes the implementation of a 1.2-V programmable gain amplifier (PGA) for high-definition (HD) video digitizers in a 65-nm digital CMOS process. The “pseudo” switched-capacitor (SC) PGA architecture buffers the video signal, without switching, during the active video. The SC circuitry is used for setup of DC operating point during horizontal and vertical blanking periods. Additionally, it compensates for the `sync-tip' of analog video signals to an equal blanking level for increased dynamic range to the digitizer following the PGA. The operational transconductance amplifier (OTA) employed as main amplifier in the PGA is a pseudo-differential, positive-feedback input stage architecture with a common-mode feedforward (CMFF) technique. The common-mode feedback (CMFB) is provided once two OTAs are cascaded. Schematic-level simulation results show that the OTA maintains a -3-dB bandwidth of 550 MHz, while keeping the distortion HD3 at -60 dB for a 30-MHz, 850 mVpp high definition video signal. The 88 dB DC gain is distributed among four OTA stages and the overall, combined PGA achieves a signal-to-noise ratio of 63 dB. Due to only two stacked transistors, it achieves high output swing of ±0.85 V, 1240 V/μs slew rate while consuming 10.4 mW power.
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| 7. |
- Abadei, S., et al.
(författare)
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Microwave properties of tunable capacitors basee on magnetron sputtered ferroelectric Na0.5K0.5NbO3 film on low and high resistivity silicon substrates
- 2001
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Ingår i: Integrated Ferroelectrics. - : Informa UK Limited. - 1058-4587 .- 1607-8489. ; 39:1-4, s. 359-366
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In this work, small signal DC voltage dependent dielectric permittivity, loss tangent, and tuneability of magnetron sputtered epitaxial Na0.5K0.5NO3 films are studied experimentally. (100)-oriented Na0.5K0.5NbO3 films are deposited onto SiO2-buffered CMOS grade low resistivity (p = 10-20 cm) and high resistivity (p = 15-45 kcm) silicon substrates. Planar capacitors with 2 or 4 m gaps between electrodes have been fabricated on top of ferroelectric films. These devices have been characterized in the frequency range 1.0 MHz to 50 GHz at temperatures 30 - 300K. Na0.5K0.5NbO3/SiO2/Si structures on high resistivity silicon substrate exhibit C-V performances typical for Metal-Insulator- Semiconductor (MIS) capacitors. At low frequencies, f 1.0 GHz, the large tuneability and large losses are associated with the MIS structure, while at higher microwave frequencies the tuneability is mainly associated with the ferroelectric, film. At 1.0 MHz and room temperature, the tuneability of Na0.5K0.5NbO3/SiO2/Si structures more than 90%, reducing to 10-15 % at 50 GHz. The losses decrease with increasing the DC bias and frequency. A Q-factor more than 15 at 50 GHz is observed. The dielectric permittivity of the Na0.5K0.5NbO3 film is in the range 50-150 at frequencies 0.045-50 GHz. On low resistivity substrate the performance of Na0.5K0.5NbO3 films is completely screened by the high losses in silicon, and the tuneability is negligible. © 2001 Taylor and Francis.
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| 8. |
- Abara, Precious Ugo, et al.
(författare)
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Spectral Conditions for Stability and Stabilization of Positive Equilibria for a Class of Nonlinear Cooperative Systems
- 2018
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Ingår i: IEEE Transactions on Automatic Control. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 0018-9286 .- 1558-2523. ; 63:2, s. 402-417
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Tidskriftsartikel (refereegranskat)abstract
- Nonlinear cooperative systems associated to vector fields that are concave or subhomogeneous describe well interconnected dynamics that are of key interest for communication, biological, economical, and neural network applications. For this class of positive systems, we provide conditions that guarantee existence, uniqueness and stability of strictly positive equilibria. These conditions can be formulated directly in terms of the spectral radius of the Jacobian of the system. If control inputs are available, then it is shown how to use state feedback to stabilize an equilibrium point in the interior of the positive orthant.
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| 9. |
- Abarghouyi, Hadis, et al.
(författare)
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QoE-Aware Beamforming Design for Massive MIMO Heterogeneous Networks
- 2018
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Ingår i: IEEE Transactions on Vehicular Technology. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 0018-9545 .- 1939-9359. ; 67:9, s. 8315-8323
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Tidskriftsartikel (refereegranskat)abstract
- One of the main goals of the future wireless networks is improving the users' quality of experience (QoE). In this paper, we consider the problem of the QoE-based resource allocation in the downlink of a massive multiple-input multiple-output heterogeneous network. The network consists of a macrocell with a number of small cells embedded in it. The small cells' base stations (BSs) are equipped with a few antennas, while the macro BS is equipped with a massive number of antennas. We consider the two services Video and Web Browsing and design the beamforming vectors at the BSs. The objective is to maximize the aggregated mean opinion score (MOS) of the users under constraints on the BSs' powers and the required quality of service of the users. We also consider extra constraints on the QoE of users to more strongly enforce the QoE in the beamforming design. To reduce the complexity of the optimization problem, we suggest suboptimal and computationally efficient solutions. Our results illustrate that increasing the number of antennas at the BSs and also increasing the number of small cells' antennas in the network leads to a higher user satisfaction.
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| 10. |
- Abarkan, Myriam, et al.
(författare)
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Vertical Organic Electrochemical Transistors and Electronics for Low Amplitude Micro-Organ Signals
- 2022
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Ingår i: Advanced Science. - : Wiley. - 2198-3844. ; 9:8
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Tidskriftsartikel (refereegranskat)abstract
- Electrical signals are fundamental to key biological events such as brain activity, heartbeat, or vital hormone secretion. Their capture and analysis provide insight into cell or organ physiology and a number of bioelectronic medical devices aim to improve signal acquisition. Organic electrochemical transistors (OECT) have proven their capacity to capture neuronal and cardiac signals with high fidelity and amplification. Vertical PEDOT:PSS-based OECTs (vOECTs) further enhance signal amplification and device density but have not been characterized in biological applications. An electronic board with individually tuneable transistor biases overcomes fabrication induced heterogeneity in device metrics and allows quantitative biological experiments. Careful exploration of vOECT electric parameters defines voltage biases compatible with reliable transistor function in biological experiments and provides useful maximal transconductance values without influencing cellular signal generation or propagation. This permits successful application in monitoring micro-organs of prime importance in diabetes, the endocrine pancreatic islets, which are known for their far smaller signal amplitudes as compared to neurons or heart cells. Moreover, vOECTs capture their single-cell action potentials and multicellular slow potentials reflecting micro-organ organizations as well as their modulation by the physiological stimulator glucose. This opens the possibility to use OECTs in new biomedical fields well beyond their classical applications.
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