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Gotowa bibliografia na temat „Generator Q”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Generator Q"

Rocco, Noraí R., i Eunice C. P. Rodrigues. "The q-tensor square of finitely generated nilpotent groups, q odd". Journal of Algebra and Its Applications 16, nr 11 (4.10.2017): 1750211. http://dx.doi.org/10.1142/s0219498817502115.

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In the present paper, the authors extend to the [Formula: see text]-tensor square [Formula: see text] of a group [Formula: see text], [Formula: see text] an odd positive integer, some structural results due to Blyth, Fumagalli and Morigi concerning the non-abelian tensor square [Formula: see text] ([Formula: see text]). The results are applied to the computation of [Formula: see text] for finitely generated nilpotent groups [Formula: see text], specially for free nilpotent groups of finite rank. We also generalize to all [Formula: see text] results of Bacon regarding an upper bound to the minimal number of generators of the non-abelian tensor square [Formula: see text] when [Formula: see text] is a [Formula: see text]-generator nilpotent group of class 2. We end by computing the [Formula: see text]-tensor squares of the free [Formula: see text]-generator nilpotent group of class 2, [Formula: see text]. This shows that the above mentioned upper bound is also achieved for these groups when [Formula: see text] odd.

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Qian, Biao, Yang Wang, Richang Hong i Meng Wang. "Rethinking Data-Free Quantization as a Zero-Sum Game". Proceedings of the AAAI Conference on Artificial Intelligence 37, nr 8 (26.06.2023): 9489–97. http://dx.doi.org/10.1609/aaai.v37i8.26136.

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Data-free quantization (DFQ) recovers the performance of quantized network (Q) without accessing the real data, but generates the fake sample via a generator (G) by learning from full-precision network (P) instead. However, such sample generation process is totally independence of Q, specialized as failing to consider the adaptability of the generated samples, i.e., beneficial or adversarial, over the learning process of Q, resulting into non-ignorable performance loss. Building on this, several crucial questions --- how to measure and exploit the sample adaptability to Q under varied bit-width scenarios? how to generate the samples with desirable adaptability to benefit the quantized network? --- impel us to revisit DFQ. In this paper, we answer the above questions from a game-theory perspective to specialize DFQ as a zero-sum game between two players --- a generator and a quantized network, and further propose an Adaptability-aware Sample Generation (AdaSG) method. Technically, AdaSG reformulates DFQ as a dynamic maximization-vs-minimization game process anchored on the sample adaptability. The maximization process aims to generate the sample with desirable adaptability, such sample adaptability is further reduced by the minimization process after calibrating Q for performance recovery. The Balance Gap is defined to guide the stationarity of the game process to maximally benefit Q. The theoretical analysis and empirical studies verify the superiority of AdaSG over the state-of-the-arts. Our code is available at https://github.com/hfutqian/AdaSG.

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Lee, Suyeon, Yangji Jeon, Geonwoo Park, Jinman Myung, Seungjik Lee, Ockgoo Lee, Hyunwon Moon i Ilku Nam. "A 24-GHz RF Transmitter in 65-nm CMOS for In-Cabin Radar Applications". Electronics 9, nr 12 (26.11.2020): 2005. http://dx.doi.org/10.3390/electronics9122005.

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A 24-GHz direct-conversion transmitter is proposed for in-cabin radar applications. The proposed RF transmitter consists of an I/Q up-conversion mixer, an I/Q local (LO) oscillator generator, and a power amplifier. To improve the linearity of the I/Q up-conversion mixer, an inverter transconductor with third-order intermodulation (IM3) distortion cancellation is proposed. To improve the I/Q balancing performance of the I/Q LO generator, a poly-phase filter, including parasitic line inductance, is proposed. By employing a highly linear I/Q up-conversion mixer and a balanced I/Q LO generator, the 24-GHz direct-conversion transmitter achieves high linearity and I/Q balancing characteristics. It is fabricated in a 65-nm CMOS process and consumes 150 mW. It shows an OP1dB of 8.6 dBm, an LO leakage of −48 dBc, and an image rejection ratio of −49 dBc for the entire operating band from 24 GHz to 24.5 GHz.

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Miller-Sims, Laurel, i Leanne Robertson. "Power integral bases for real cyclotomic fields". Bulletin of the Australian Mathematical Society 71, nr 1 (luty 2005): 167–73. http://dx.doi.org/10.1017/s0004972700038119.

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We consider the problem of determining all power integral bases for the maximal real subfield Q (ζ + ζ−1) of the p-th cyclotomic field Q (ζ), where p ≥ 5 is prime and ζ is a primitive p-th root of unity. The ring of integers is Z[ζ+ζ−1] so a power integral basis always exists, and there are further non-obvious generators for the ring. Specifically, we prove that if or one of the Galois conjugates of these five algebraic integers. Up to integer translation and multiplication by −1, there are no additional generators for p ≤ 11, and it is plausible that there are no additional generators for p > 13 as well. For p = 13 there is an additional generator, but we show that it does not generalise to an additional generator for 13 < p < 1000.

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BASU-MALLICK, B. "ON A HOPF ALGEBRA RELATED TO THE GLq(2) AND GLp,q(2) QUANTUM GROUPS". International Journal of Modern Physics A 11, nr 04 (10.02.1996): 715–32. http://dx.doi.org/10.1142/s0217751x96000328.

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By adding one extra generator with the standard GL q(2) quantum group, we construct a Hopf algebra [Formula: see text] which depends on two deformation parameters and five generators. Curiously, it turns out that there exists a nonlinear realization of the two-parameter deformed GL p,q(2) quantum group through generators of this [Formula: see text] algebra. Subsequently, we find the invariant noncommutative planes associated with the [Formula: see text] quantum group and also discuss how the well-known Manin planes corresponding to the GL p,q(2) quantum group can be produced automatically, through such construction. Finally, we consider the “colored” extension of the GL p,q(2) quantum group as well as corresponding noncommutative planes and explore their intimate connection with the “colored” extension of [Formula: see text] Hopf structure.

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Yanita, Yanita, i Budi Rudianto. "The Picture on the Presentation of Direct Product Group of Two Cyclic Groups". Journal of Applied Mathematics 2023 (31.08.2023): 1–6. http://dx.doi.org/10.1155/2023/8018645.

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A picture in a group presentation is a geometric configuration with an arrangement of discs and arcs within a boundary disc. The drawing of this picture does not have to follow a particular rule, only using the generator as discs and the relation as arcs. It will form a picture label pattern if drawn with a particular rule. This paper discusses the label pattern of a picture in the presentation of direct product groups. Direct product presentation is used with two cyclic groups, ℤ p and ℤ q where p , q ∈ ℤ + and p , q ≥ 2 . The method for forming a picture label pattern is to arrange the first generator in the initial arrangement, compile a second generator, and add a number of commutators. Furthermore, the pattern is used to calculate the length of the label on the picture. It is obtained that the picture’s label is a q − 1 b n a b q − n and the length of the label is p + 2 n − q , where n is the number of commutator discs.

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Koam, Ali N. A., Ali Ahmad, Muhammad Azeem, Adnan Khalil i Muhammad Faisal Nadeem. "On Adjacency Metric Dimension of Some Families of Graph". Journal of Function Spaces 2022 (25.06.2022): 1–8. http://dx.doi.org/10.1155/2022/6906316.

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Metric dimension of a graph is a well-studied concept. Recently, adjacency metric dimension of graph has been introduced. A set Q a ⊂ V G is considered to be an adjacency metric generator for G if u 1 , u 2 ∈ V \ Q a (supposing each pair); there must exist a vertex q ∈ Q a along with the condition that q is indeed adjacent to one of u 1 , u 2 . The minimum number of elements in adjacency metric generator is the adjacency metric dimension of G , denoted by di m a G . In this work, we compute exact values of the adjacency metric dimension of circulant graph C n 1 , 2 , Möbius ladder, hexagonal Möbius ladder, and the ladder graph.

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M. A. Eid, Mahmoud, Ashraf S. Seliem, Ahmed Nabih Zaki Rashed, Abd El-Naser A. Mohammed, Mohamed Yassin Ali i Shaimaa S. Abaza. "The key management of direct/external modulation semiconductor laser response systems for relative intensity noise control". Indonesian Journal of Electrical Engineering and Computer Science 21, nr 2 (1.02.2021): 968. http://dx.doi.org/10.11591/ijeecs.v21.i2.pp968-977.

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<p><span>This study outlines the management of either direct or external modulation semiconductor laser systems for the key solution of bit rate up to 25 Gb/s under relative intensity noise (RIN) control. The bias and modulation peak currents based laser rate equations are optimized to achieve max Q factor and min bit error rate (BER) using first proposed model and optical/electrical signal power, optical/electrical signal to noise ratio are also enhanced using second proposed model. The percentage enhancement ratio in max. Q-factor and min. BER using first proposed model ranges from 53.25 % to 71.63 % in compared to the previous model. In the same way, by using second proposed model, the electrical signal power at optical receiver is enhanced within the range of 48.66 % to 68.88 % in compared to the previous model. Optical signal/noise ratio (OSNR) after optical fiber cable (OFC), signal/noise ratio (SNR) after electrical filter are measured with using different electrical pulse generators and electrical modulators at the optimization stage. The first proposed model reported better max. Q and min. BER values than the previous model. In addition to the second proposed model (direct modulation) has outlined better optical/electrical signal power than the previous model, while max. Q, min. BER values are kept constant. It is found that non return to zero pulse generator has presented better signal power than other pulse generators by using second proposed model. As well as the mixed of raised cosine pulse generator with external modulator reported max. Q, min. BER with other pulse generators by using first proposed model. OSNR at OFC is optimized by using continuous phase frequency shift keying (CPFSK) electrical modulator, While SNR at optical receiver is optimized by using phase shift keying (PSK) electrical modulator.</span></p>

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Azis, Hastuti, Pawenary Pawenary i Meyhart Torsna Bangkit Sitorus. "Simulasi Pemodelan Sistem Eksitasi Statis pada Generator Sinkron terhadap Perubahan Beban". Energi & Kelistrikan 11, nr 2 (30.07.2019): 46–54. http://dx.doi.org/10.33322/energi.v11i2.483.

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Excitation system is one of the most important parts of synchronous generators, where the system functions to provide dc power to the field generator coil. Iin this study, a static excitation system consisting of transformers and connected thyristors in bridge configuration has been implemented in synchronous machines that operate as 206,1 mva capacity generators, 16,5 kv using the help of matlab simulink r2017b software. By adjusting the load given to the generator, variations in excitation currents can affect the amount of output voltage generated by the generator so that it can increase and decrease the induced voltage. In full load conditions, namely p = 175 mw, q = 100 mvar, the results of the study show that when the simulation is run at alpha 0 °, it is known that the average value of dc voltage is 496,4 v, excitation current is 1057 a and voltage generator output has increased beyond its nominal voltage of 16,72 kv. in this case, to maintain the terminal voltage, the excitation current must be reduced by increasing the angle of shooting of the thyristor to an alpha angle of 45 °, so that the average dc voltage can be reduced to 479,3 v, as well as the excitation current to 985,9 a. the generator output voltage at the alpha 45 ° angle is obtained according to its nominal value of 1,.5 kv.

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Kim, Soo-Bin, i Seung-Ho Song. "A Hybrid Reactive Power Control Method of Distributed Generation to Mitigate Voltage Rise in Low-Voltage Grid". Energies 13, nr 8 (21.04.2020): 2078. http://dx.doi.org/10.3390/en13082078.

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A high penetration of distributed generators, such as solar and wind power generators in low voltage network systems, impose voltage rise problems. Reactive power control of distributed generators can contribute to mitigating the voltage rise. In the existing reactive power control, reactive power was controlled using only one local variable, such as voltage at point of connection or the active power output of distributed generator. In case of PF(P) method, which provides certain power factors, depending on the active power of distributed generator, the voltage regulation ability is strong, but network losses are large. Q(V) method, which provides a certain amount of reactive power depending on the local voltage, has few network losses, but the voltage regulation ability is weak. In this paper, a reactive power control method that combines the PF(P) method and Q(V) method was proposed. The proposed method determines the reactive power output by using the active power of the distributed generator and local voltage variables together. The proposed method improves the voltage regulation ability of the reactive power control, while reducing the network losses, as compared to the existing method. The low voltage network system was modeled and simulated to evaluate the performance of the proposed method, in terms of voltage regulation ability and network losses, and the performance of the proposed method and the existing method were compared and analyzed.

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Rozprawy doktorskie na temat "Generator Q"

Goman, Anna. "Waveform Generator Implemented in FPGA with an Embedded Processor". Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2026.

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Communication and digital signal processing applications of today are often developed as fully integrated systems on one single chip and are implemented as application specific integrated circuits using e.g. VLSI technology. As the systems are getting more and more complex in terms of speed and performance the chip size and the design time tend to increase rapidly. This will result in search for cheaper and less time consuming alternatives. One alternative is field programmable gate arrays, so called FPGAs. The FPGAs are getting faster, cheaper and the number of gates increases all the time. A long list of ready to use functional blocks so called intellectual property (IP) blocks can be used in FPGAs. The latest FPGAs can also be bought with one or more embedded processors, in form of hard processor cores or as licenses for soft processor cores. This will speed up the design phase and of course also decrease the crucial time to market even more.

The purpose of this master’s thesis was to develop a waveform generator to generate a sine signal and a cosine signal, I and Q, used for radio/radar applications. The digital signals should have an output data rate of at least 100 MHz. The digital part of the system should be implemented in hardware using e.g. an FPGA. To convert the digital signals to analog signals two D/A converters are used. The analog signals, I and Q, should have a bandwidth of 1 MHz - 11 MHz.

The waveform generator was developed and implemented using a Virtex II FPGA from Xilinx. An embedded microprocessor within the FPGA, MicroBlaze, in form of a soft processor core was used to control the system. A user interface program running on the microprocessor was also developed. Testing of the whole system, both hardware and software, was done. The system is able to generate digital sine and cosine curves of an output data rate of 100 MHz.

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Shen, Baike 1972. "Slip frequency phase lock loop (PLL) for decoupled P-Q control of doubly-fed induction generator (DFIG)". Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81568.

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The term "sensor-less" in power electronic drives refers to measurement of mechanical shaft position and/or speed from the currents and voltages of the electrical machine. This thesis presents innovative sensor-less means (a Slip Frequency Phase Lock Loop (PLL) and a gamma-delta Axes Aligner) for implementing decoupled P-Q control of a doubly-fed induction generator (DFIG) for wind-turbine application. Proofs of concepts are by digital simulations.
The accuracy of the Slip Frequency Phase Lock Loop in speed estimation is evaluated; the origin of a shortcoming (small phase lag) located and compensated for.
The Slip Frequency Phase Lock Loop (PLL) and a gamma-delta Axes Aligner are then evaluated as parts of the decoupled P-Q control of a wind turbine driven doubly-ed induction generator. The research succeeds in realizing robust decoupled P-Q control, that is one in which the generator parameters do not have to be known precisely and can have minor variations such as drifts with temperature. The system has been successfully tested for optimal wind power acquisition.

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Chen, Jian. "Nonlinear adaptive control of permanent magnet synchronous generator based wind turbine : a perturbation estimation approach". Thesis, University of Liverpool, 2014. http://livrepository.liverpool.ac.uk/2007963/.

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This thesis deals with the modeling and control of permanent magnet synchronous generator based wind turbines (PMSG-WTs). The PMSG-WTs are widely used in wind energy conversion systems(WECSs), due to their merits such as high reliability, high efficiency, low noise, high torque to weight ratio and fast dynamic response. Usually, a PMSG-WT is connected to the power grid via an AC-DC-AC converter system. The PMSG-WT can rotate at varying speed based on variable wind power input and thus achieve high efficiency as it dose not need to synchronise its rotational speed with the grid frequency. An overview of the modeling of the PMSG-WT is give at first, with conventional vector control (VC) strategies applied for machine-side and grid-side converter. The VC strategy is a popular method widely used in industry due to its decoupled control of active/reactive power, but it may not provide satisfactory performance for the PMSG-WT as it is required to operate at varying speed in an operation envelope with wide operating range rather than one operation point. The feedback linearisation control (FLC) strategy can improve the performance of the VC with a global optimal controller crossing a wide region and variable operation points, but it has weak robustness against parameter uncertainties and external disturbances, and requires full state measurements. To improve performance of the VC and the FLC, nonlinear adaptive controllers (NACs) designed based on FLC and perturbation estimation and their applications in machine-side and grid-side converter control of the PMSG-WT, and speed control of a permanent magnet synchronous motor (PMSM) have been studied. In the design of the proposed NAC, by defining a lumped perturbation term to present coupling nonlinear dynamics, parameter uncertainties, and other unknown disturbance, then a perturbation observer is designed to estimate the perturbation which is used to compensate the real perturbation and realise an adaptive linearising of the original nonlinear system, without requiring the accurate system model and parameters and full state measurements, and still considering all system nonlinearities and unknown time-varying dynamics, such as tower shadow, grid faults and intermittent wind power inputs. In this thesis, the proposed control schemes are applied for control of PMSGWT in Region 2, Region 3 and integration with the grid. A NAC is developed for a PMSG-WT to extract maximum wind power in Region 2. Simulation and experiment studies are carried out to verify the design and results show that the proposed NAC can provide better performance in MPPT and robustness against parameter uncertainties and time-varying wind power inputs, in comparison with a convention VC and FLC. NACs are designed for control of the pitch angle and generator control of a PMSG-WT to limit the extracted power from time varying wind in Region 3. Simulation results of the proposed NACs are compared to a conventional VC and FLC. The fault ride-through capability (FRTC) of the PMSG-WT at different voltage dip’s levels has been enhanced by a novel NAC applied at the grid-side converter. Simulation results have shown that the proposed NAC can provide satisfactory performances with smaller inrush current and voltage overshoots during grid fault and better robustness against uncertainties. A coordinated nonlinear adaptive control (CNAC) of the machine-side and grid-side converter in the PMSG-WT were studied. The NACs are designed based on state and perturbation observers for control of subsystems. Simulation results show that the CNAC can coordinate each other to achieve the objectives of different operating regions and enhance the FRTC of the PMSG-WT. Finally, the proposed control schemes are applied for control of PMSM. NAC is developed for PMSM to track mechanical rotation speed and provide high robustness against system parameter uncertainties and unknown time-varying load disturbances. Simulation results show that the proposed NAC provides better performance and robustness against system parameter uncertainties and unknown time-varying load disturbances, in comparison with a nonlinear controller with an extended nonlinear observer and a conventional VC.

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Gogas, Kyriakos. "Design of a robust speed and position sensorless decoupled P-Q controlled doubly-fed induction generator for variable-speed wind energy applications". Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99762.

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Wind energy is a relatively young but rapidly expanding industry. In order for wind generation to be cost effective, it must produce energy at a minimum cost per dollar of investment. Performance characteristics such as power output versus wind speed must be optimized in order to compete with other energy sources. Also, if the utility uses wind power for a part of its generation, the output power of these turbines must have the same high quality and reliability when it enters the utility grid. The ability to vary operating speed is important in wind generation because it allows for an optimization of the transfer of power from the wind to the turbine shaft. Doubly-fed induction generators (DFIG) are an interesting solution for variable-speed systems with limited variable speed range, and are typically used in wind energy conversion systems.
The objectives of this thesis are to implement a decoupled P-Q control of a DFIG that does not rely on mechanical sensors and to design a speed and position sensorless algorithm that is robust to variations of the values of the machine parameters. The sensorless DFIG control algorithm presented in this thesis is based on a modified phasedlock loop with an improved positioning algorithm. With the measured stator voltages, stator and rotor currents, the speed and position of the DFIG are estimated. The speed is estimated independent of machine parameters, which results in a significant improvement in speed control robustness to parameter variations. In addition, the algorithm avoids using differentiation, which significantly improves its immunity to noise and does not require the measurement of the rotor voltages. Also, it is shown that the positioning algorithm has an improved operation in generator mode. Although the accuracy of the positioning algorithm is depended on machine parameters; it is shown with the designed controller that the P-Q decoupled control is robust to changes of machine parameters. Theoretical and simulation results are validated on an experimental setup.

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Strudwick, Scott David. "A trend analysis expert system for the remote condition monitoring of diesel generators". Thesis, University of Greenwich, 1993. http://gala.gre.ac.uk/8704/.

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Nguyen, Phuong. "Ethnic gap, household businesses and social networks in Vietnam The role of Social Networks on Household Business Performance in Vietnam: A qualitative assessment". Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLED080.

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Au cours des deux dernières décennies, les deux groupes vulnérables des ethnies minoritaires et des entreprises familiales ont contribué à la croissance économique, mais n’ont pas été en mesure de bénéficier de la croissance économique autant que d’autres groupes au Vietnam. Le caractère moins inclusif de ces deux groupes dans la croissance économique demande une étude sur l'écart ethnique de bien être et des performances des entreprises familiales au point de vue des réseaux sociaux. Cette recherche étudie le rôle des réseaux sociaux en utilisant la méthode Q-square sur une base de données originale, les données quantitatives et qualitatives des relations sociales d'une entreprise familiale, et avec un instrument innovant: être le fils l'aîné. Le chapitre 1 mesure et analyse les déterminants principaux de l’écart ethnique pendant les dix ans derniers. Le chapitre 2 identifie les effects de cause entre les réseaux sociaux et la performance des entreprises familiales. Enfin, le chapitre 3 présente une étude qualitative de l'impact des réseaux sociaux sur les performances des entrepreneurs informels. Cette étude se centre sur une dimension particulière des réseaux qui est la force des liens. Elle distingue par ailleurs l’utilisation des réseaux à la création de l’entreprise et à un stade plus avancé de son développement
Over the past two decades, the two vulnerable groups of ethnic minorities and household businesses have participated in the economic growth but could not benefit from the growth process as much as the other groups in Vietnam. The inadequate inclusiveness of these two groups in the economic growth calls for an investigation of the ethnic gap and household businesses' performance with a lens of social networks. This study aims to examine the role of social networks, using a Q-squared method to analyze an original dataset, which combined both the quantitative and qualitative datasets on social networks of household businesses. In doing so, the study employs an innovative instrument of being the first son in the family. Chapter 1 measures and analyses the main drivers of the ethnic gap over the last ten years. Chapter 2 identifies the causal effects of social networks on household businesses' performance. Chapter 3 presents a qualitative analysis of the impact of social networks on business performance by the content and the strength of social relationships, and the business phase

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Koppula, Sreedevi. "Automated GUI Tests Generation for Android Apps Using Q-learning". Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984181/.

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Mobile applications are growing in popularity and pose new problems in the area of software testing. In particular, mobile applications heavily depend upon user interactions and a dynamically changing environment of system events. In this thesis, we focus on user-driven events and use Q-learning, a reinforcement machine learning algorithm, to generate tests for Android applications under test (AUT). We implement a framework that automates the generation of GUI test cases by using our Q-learning approach and compare it to a uniform random (UR) implementation. A novel feature of our approach is that we generate user-driven event sequences through the GUI, without the source code or the model of the AUT. Hence, considerable amount of cost and time are saved by avoiding the need for model generation for generating the tests. Our results show that the systematic path exploration used by Q-learning results in higher average code coverage in comparison to the uniform random approach.

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Felgate, Nigel Stephen. "Efficient blue generation from all-solid-state Q-switched Nd:YAG lasers". Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/41527/.

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This thesis describes work carried out at Southampton University that has been directed towards achieving high-power all-solid-state blue sources using two low-gain transitions of Nd:YAG. Diode-end-pumping is used to obtain efficient laser performance. The thesis attempts to tackle some of the obstacles to power scaling Q-switched low-gain lasers that use diode-end-pumping schemes. A 1319nm Q-switched Nd:YAG laser is described that produces a 17KHz pulse train consisting of 353 watt peak power pulses delivering an average power of 780mW for doubling. Periodically poled lithium niobate (PPLN) is used to double to 659.5nm. A 54% second harmonic conversion efficiency produces 360mW of red average power. Sum frequency mixing of the red and infra-red in a second PPLN sample is achieved with a third order grating. A pulsed blue output (13.7 watts peak) at 439.7nm is achieved with good beam quality and an average power of 35mW. A technique is described to aid power-scaling of polarised laser sources. Analysis of the quarter wave-plate technique demonstrates that the technique will be highly beneficial in reducing the depolarisation loss in low-gain solid-state lasers. The technique is applied to a 946nm laser and a 1319nm laser. Depolarisation of the 946nm source is reduced from 1.66% to 0.0006% and depolarisation of the 1319nm laser is reduced from 1.2% to 0.015%. The quarter wave-plate technique is implemented in a high power 946nm laser that is Q-switched for low repetition rates. 0.53mJ is extracted with a 5.3KW peak pulse power at 1 kHz repetition rate. The 946nm output is used to generate 473nm blue light via second harmonic generation in non-critically phase-matched LBO at 329° centigrade. An average power of 370mW is demonstrated with a conversion efficiency of 21% at 4kHz repetition rate.

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Tjörnhammar, Staffan. "Pulsed Yb:KYW laser and UV generation". Thesis, KTH, Laserfysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-51595.

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In this master thesis project, a pulsed UV laser was designed and constructed. Also, the effects of absorption in a volume Bragg grating were investigated. The laser was diode pumped and constructed with Yb:KYW as gain medium. The lasing was at a wavelength of 1029.2 nm with a spectral bandwidth of 0.23 nm, locked by a volume Bragg grating that was used as input coupler for spectral control. Passive Q‑switching was used to generate pulses by placing a Cr:YAG saturable absorber inside the cavity. The laser generated radiation with a maximum peak power of 3.8 kW at an average power of 0.35 W, a repetition rate of 4 kHz and a pulse width of 16 ns. The maximum average power was 1.3 W with a peak power of 2 kW at a repetition rate of 20 kHz and with a pulse width of 20 ns. Through extra‑cavity second harmonic generation using an LBO crystal, green light at a wavelength of 514.7 nm was generated. The maximum average power was 130 mW with an optical conversion efficiency from the fundamental of around 10 %. Then, the second harmonic and the fundamental wave were mixed to generate UV light, at a wavelength of about 343 nm, by using a second LBO crystal. The maximum average power of UV was about 23 mW with an optical efficiency, with respect to the green, of approximately 20 %. One limitation of the laser was that the Cr:YAG was bleached not only by the circulating laser field, but also by remaining pump light. This resulted in decreasing peak power with increasing pump power, thus limiting the nonlinear conversion efficiencies. Thermal fracture of the Cr:YAG was a limiting factor for the intra-cavity average power, while burning of the coating on the Yb:KYW crystal limited the maximum peak power. The effects on a laser when using too high power for the level of absorption in a volume Bragg grating were also investigated. The effects of both resonant and non-resonant beams were investigated. Since the intensity of a resonant beam decreases approximately exponentially in a volume Bragg grating, due to absorption, an uneven temperature distribution along the propagation axis is formed. This results in different thermal expansion and hence, results in a longitudinal chirp of the grating. The chirp caused a decrease in both reflectivity and spectral selectivity. The reflectivity of the particular grating used in these experiments decreased from 99.4 % to 93 %. In addition, it was experimentally shown that if a volume Bragg grating absorbs a non-negligible amount of a non-resonant beam, the thermal load will deform the volume Bragg grating. Therefore, it is not suitable to use such a grating the as input coupler of a laser cavity.
I detta examensarbete utformades och konstruerades en pulsad UV-laser. Dessutom undersöktes effekterna av absorption i ett volymbraggitter. Som laserkristall användes Yb:KYW vilken pumpades med en diodlaser. Lasring skedde vid 1029,2 nm med en bandbredd av 0,23 nm genom att ett volymbraggitter användes som inkopplingsspegel för att kontrollera spectrumet. Pulser generades genom passiv Q-switching med en Cr:YAG som mättnadsbar absorbator inne i kaviteten. Den maximala toppeffekten var 3,8 kW vid 0.35 W medeleffekt, 4 kHz repetitionsfrekvens och en pulsbredd på 16 ns. Den maximala medeleffekten var 1.3 W med en toppeffekt på 3,8 kW, 20 kHz repetitionsfrekvens och en pulsbredd på 20 ns. Genom frekvensdubbling i en LBO kristall genererades grönt ljus vid våglängden 514,7 nm. Den maximala medeleffekten var 130 mW med en optisk verkningsgrad från den fundamentala våglängden på 10 %. Sedan blandades det infraröda och det gröna ljuset i en andra LBO kristall för att generera UV-ljus, vid en våglängd om 343 nm. Den högsta medeleffekten av UV var cirka 23 mW med en optisk verkningsgrad, med avseende på det gröna ljuset, på ungefär 20%. En begränsning av laser var att Cr:YAG kristallen blektes inte enbart av lasern utan även av pumpen. Detta resulterade i fallande toppeffekt med ökande pumpeffekt, vilket begränsade effektiviteten i den ickelinjära konverteringen. Termisk fraktur på Cr:YAG kristallen var en begränsande faktor för cirkulerande medeleffekten i kaviteten, medan brännskador på Yb-kristallens antireflexbehandling begränsade toppeffekten. Effekterna i en laser vid användning av en alltför hög effekt i förhållande till nivån av absorption i ett volymbraggitter studerades också. Effekterna av både resonanta och ickeresonanta strålar undersöktes. Eftersom intensiteten av en resonant ståle minskar ungefär exponentiellt i ett volymbraggitter kommer temperaturen, på grund av absorption, fördelas ojämnt i propageringsriktningen. Detta resulterar i olika termiska expansion med en längsgående varierad gitterperiod som följd. Detta orsakar en minskning utav både reflektiviteten och den spektrala selektiviteten. Reflektiviteten i gittret som användes i dessa experiment minskade från 99,4 % till 93 %. Dessutom visades det experimentellt att om ett volymbraggitter absorberar en icke försumbar del av en ickeresonant stråle kommer värmebelastning att deformera volymenbraggittret. Därför är det inte lämpligt att använda ett sådant gitter som inkopplingsspegel i en laser.

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Gugler, Klaus, Adhurim Haxhimusa, Mario Liebensteiner i Nora Schindler. "Investment under Uncertainty in Electricity Generation". WU Vienna University of Economics and Business, 2016. http://epub.wu.ac.at/5177/1/wp234.pdf.

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The recent transformation of European electricity markets with increasing generation from intermittent renewables brings about many challenges. Among them, decaying wholesale prices, partly due to support schemes for renewables, may send insufficient investment signals for other technologies. We investigate the investment decision in a structural equation based on the Tobin's q-model, which we extend by both industry- and firm-technology-specific uncertainty. We utilize rich and novel data at the disaggregated firm generation technology level of European electricity generating firms for the period 2006-2014. Our results show that investment in any generation technology follows market incentives despite sunk and irreversible capital, confirming the implications of the q-model. Moreover, while firm-technology-specific uncertainty decreases firms' investment activity, especially in coal and gas, aggregate uncertainty triggers firms' investment. Our results raise concerns about system reliability in the long run since conventional technologies still serve as a flexible system back-up. (authors' abstract)
Series: Department of Economics Working Paper Series

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Książki na temat "Generator Q"

Cox, Greg. Star Trek The Next Generation: Q-Strike: The Q Continuum Book 3. New York: Pocket Books, 1998.

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Cox, Greg. Star Trek The Next Generation: Q-Zone: The Q Continuum Book 2. New York: Pocket, 1998.

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Lancie, John De. I, Q: Star Trek: The Next Generation. New York: Pocket Books, 1999.

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United States. National Aeronautics and Space Administration. i United States. National Oceanic and Atmospheric Administration., red. GOES-NO/P/Q: The next generation. [Washington, D.C.]: National Aeronautics and Space Administration, 2001.

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United States. National Aeronautics and Space Administration. i United States. National Oceanic and Atmospheric Administration, red. GOES-NO/P/Q: The next generation. [Washington, D.C.?: National Aeronautics and Space Administration, 2001.

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Q-Squared: Star Trek: The Next Generation. New York: Pocket Books, 1994.

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United States. National Aeronautics and Space Administration i United States. National Oceanic and Atmospheric Administration, red. GOES-NO/P/Q: The next generation. [Washington, D.C.?: National Aeronautics and Space Administration, 2001.

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United States. National Aeronautics and Space Administration. i United States. National Oceanic and Atmospheric Administration., red. GOES-NO/P/Q: The next generation. [Washington, D.C.?: National Aeronautics and Space Administration, 2001.

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editor, Harb Gertraud contributor, Heil Christoph 1965 contributor, Felber Anneliese contributor i Magnes Angelika contributor, red. Q 11:46b, 52, 47-51: Woes against the exegetes of the law : wisdom's judgment on this generation. Leuven: Peeters Press, 2012.

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Części książek na temat "Generator Q"

Canese, Lorenzo, Gian Carlo Cardarilli, Luca Di Nunzio, Rocco Fazzolari, Marco Re i Sergio Spanó. "Automatic IP Core Generator for FPGA-Based Q-Learning Hardware Accelerators". W Lecture Notes in Electrical Engineering, 242–47. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-30333-3_32.

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Douiri, Moulay Rachid. "Neural-Based P-Q Decoupled Control for Doubly Fed Induction Generator in Wind Generation System". W Advanced Control and Optimization Paradigms for Wind Energy Systems, 213–34. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-5995-8_9.

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Prakash, Vijay, Kartikay Agrawal i Syaamantak Das. "Q-GENius: A GPT Based Modified MCQ Generator for Identifying Learner Deficiency". W Artificial Intelligence in Education. Posters and Late Breaking Results, Workshops and Tutorials, Industry and Innovation Tracks, Practitioners, Doctoral Consortium and Blue Sky, 632–38. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-36336-8_98.

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Zhang, Junli, Ancheng Xue, Tianshu Bi, Zhengfeng Wang i Wei Tang. "A New Online Identification Method for X q of Synchronous Generator with Steady-State PMU Data". W Lecture Notes in Electrical Engineering, 741–48. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-4981-2_80.

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Goldberg, Eugene. "Partial Quantifier Elimination and Property Generation". W Computer Aided Verification, 110–31. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-37703-7_6.

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AbstractWe study partial quantifier elimination (PQE) for propositional CNF formulas with existential quantifiers. PQE is a generalization of quantifier elimination where one can limit the set of clauses taken out of the scope of quantifiers to a small subset of clauses. The appeal of PQE is that many verification problems (e.g., equivalence checking and model checking) can be solved in terms of PQE and the latter can be dramatically simpler than full quantifier elimination. We show that PQE can be used for property generation that one can view as a generalization of testing. The objective here is to produce an unwanted property of a design implementation, thus exposing a bug. We introduce two PQE solvers called $$ EG \text {-} PQE $$ E G - P Q E and $$ EG \text {-} PQE ^+$$ E G - P Q E + . $$ EG \text {-} PQE $$ E G - P Q E is a very simple SAT-based algorithm. $$ EG \text {-} PQE ^+$$ E G - P Q E + is more sophisticated and robust than $$ EG \text {-} PQE $$ E G - P Q E . We use these PQE solvers to find an unwanted property (namely, an unwanted invariant) of a buggy FIFO buffer. We also apply them to invariant generation for sequential circuits from a HWMCC benchmark set. Finally, we use these solvers to generate properties of a combinational circuit that mimic symbolic simulation.

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Venkatesh, Supreeth Mysore, Antonio Macaluso i Matthias Klusch. "GCS-Q: Quantum Graph Coalition Structure Generation". W Computational Science – ICCS 2023, 138–52. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-36030-5_11.

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Boguslawsky, Iliya, Nikolay Korovkin i Masashi Hayakawa. "Methods of Decreasing Nonlinear Distortion Factor in Voltage Curve of Salient-Pole Generator: Investigation of EMF Tooth Harmonics of Its Multiphase Winding with q per Pole and Phase as Integer". W Large A.C. Machines, 371–90. Tokyo: Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-56475-1_19.

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de Azevedo, Renato Preigschadt, Maria João Varanda Pereira i Pedro Rangel Henriques. "DSL Based Automatic Generation of Q&A Systems". W Advances in Intelligent Systems and Computing, 460–71. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-16181-1_44.

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Shanthi Bala, P., i G. Aghila. "Q-Genesis: Question Generation System Based on Semantic Relationships". W Advances in Intelligent Systems and Computing, 509–17. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1882-5_44.

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Bastos, Gustavo Terra, i Marinês Guerreiro. "Idempotents Generators for Minimal Cyclic Codes of Length p n q". W Coding Theory and Applications, 345–52. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17296-5_37.

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Streszczenia konferencji na temat "Generator Q"

Singleton, Scott, i Jack Dvorkin. "Evaluation of an inelastic (Q) synthetic seismic generator". W SEG Technical Program Expanded Abstracts 2005. Society of Exploration Geophysicists, 2005. http://dx.doi.org/10.1190/1.2148040.

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Dentamaro, Vincenzo, Donato Impedovo, Giuseppe Pirlo, Giacomo Abbattista i Vincenzo Gattulli. "Double Deep Q Network with In-Parallel Experience Generator". W 2020 IEEE Conference on Evolving and Adaptive Intelligent Systems (EAIS). IEEE, 2020. http://dx.doi.org/10.1109/eais48028.2020.9122706.

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Yashkir, Yuri. "Laser micromachining with passively Q-switched intracavity harmonic generator". W Opto-Canada: SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging, redaktor John C. Armitage. SPIE, 2017. http://dx.doi.org/10.1117/12.2283960.

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Haiyan, Kang, Zhang Yangsen, Yang Lei i Liu Wenhua. "Study on Key Technologies of Generator of Q/A System". W 2008 Pacific-Asia Workshop on Computational Intelligence and Industrial Application (PACIIA). IEEE, 2008. http://dx.doi.org/10.1109/paciia.2008.292.

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Khazeiynasab, Seyyed Rashid, Junjian Qi i Issa Batarseh. "Generator Parameter Estimation by Q-Learning Based on PMU Measurements". W 2021 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT). IEEE, 2021. http://dx.doi.org/10.1109/isgt49243.2021.9372221.

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Vitan, Liviu-Danut, Lucian Tutelea, Nicolae Muntean i Ion Boldea. "Sensorless Synchronous Reluctance Generator Control Based on q Axis Estimated Current". W 2019 International Aegean Conference on Electrical Machines and Power Electronics (ACEMP) & 2019 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM). IEEE, 2019. http://dx.doi.org/10.1109/acemp-optim44294.2019.9007225.

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WANG, Shike, Zeng LIU i Jinjun LIU. "Modeling of D-Q Small-Signal Impedance of Virtual Synchronous Generator". W 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC). IEEE, 2018. http://dx.doi.org/10.1109/peac.2018.8590285.

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Jian Liu, Jianfei Yang, Huaren Wu i Xinyi Hua. "Direct Q-axis flux linkage control for permanent magnet synchronous generator". W 2015 Chinese Automation Congress (CAC). IEEE, 2015. http://dx.doi.org/10.1109/cac.2015.7382733.

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Wu, Wenjie, Feng Guo, Qiulong Ni, Xing Liu, Lin Qiu i Youtong Fang. "Deep Q-Network based Adaptive Robustness Parameters for Virtual Synchronous Generator". W 2022 IEEE Transportation Electrification Conference and Expo, Asia-Pacific (ITEC Asia-Pacific). IEEE, 2022. http://dx.doi.org/10.1109/itecasia-pacific56316.2022.9941893.

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Moffat, Eric. "What are the Low-Q and Large-x Boundaries of Collinear QCD Factorization Theorems?" W TMD MC Event Generator Workshop, Jefferson Lab, February 20, 2017. US DOE, 2017. http://dx.doi.org/10.2172/1986299.

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Raporty organizacyjne na temat "Generator Q"

Jury, William A., i David Russo. Characterization of Field-Scale Solute Transport in Spatially Variable Unsaturated Field Soils. United States Department of Agriculture, styczeń 1994. http://dx.doi.org/10.32747/1994.7568772.bard.

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This report describes activity conducted in several lines of research associated with field-scale water and solute processes. A major effort was put forth developing a stochastic continuum analysis for an important class of problems involving flow of reactive and non reactive chemicals under steady unsaturated flow. The field-scale velocity covariance tensor has been derived from local soil properties and their variability, producing a large-scale description of the medium that embodies all of the local variability in a statistical sense. Special cases of anisotropic medium properties not aligned along the flow direction of spatially variable solute sorption were analysed in detail, revealing a dependence of solute spreading on subtle features of the variability of the medium, such as cross-correlations between sorption and conductivity. A novel method was developed and tested for measuring hydraulic conductivity at the scale of observation through the interpretation of a solute transport outflow curve as a stochastic-convective process. This undertaking provided a host of new K(q) relationships for existing solute experiments and also laid the foundation for future work developing a self-consistent description of flow and transport under these conditions. Numerical codes were developed for calculating K(q) functions for a variety of solute pulse outflow shapes, including lognormal, Fickian, Mobile-Immobile water, and bimodal. Testing of this new approach against conventional methodology was mixed, and agreed most closely when the assumptions of the new method were met. We conclude that this procedure offers a valuable alternative to conventional methods of measuring K(q), particularly when the application of the method is at a scale (e.g. and agricultural field) that is large compared to the common scale at which conventional K(q) devices operate. The same problem was approached from a numerical perspective, by studying the feasibility of inverting a solute outflow signal to yield the hydraulic parameters of the medium that housed the experiment. We found that the inverse problem was solvable under certain conditions, depending on the amount of noise in the signal and the degree of heterogeneity in the medium. A realistic three dimensional model of transient water and solute movement in a heterogeneous medium that contains plant roots was developed and tested. The approach taken was to generate a single realization of this complex flow event, and examine the results to see whether features were present that might be overlooked in less sophisticated model efforts. One such feature revealed is transverse dispersion, which is a critically important component in the development of macrodispersion in the longitudinal direction. The lateral mixing that was observed greatly exceeded that predicted from simpler approaches, suggesting that at least part of the important physics of the mixing process is embedded in the complexity of three dimensional flow. Another important finding was the observation that variability can produce a pseudo-kinetic behavior for solute adsorption, even when the local models used are equilibrium.

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Ghanim, Murad, Joe Cicero, Judith K. Brown i Henryk Czosnek. Dissection of Whitefly-geminivirus Interactions at the Transcriptomic, Proteomic and Cellular Levels. United States Department of Agriculture, luty 2010. http://dx.doi.org/10.32747/2010.7592654.bard.

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Our project focuses on gene expression and proteomics of the whitefly Bemisia tabaci (Gennadius) species complex in relation to the internal anatomy and localization of expressed genes and virions in the whitefly vector, which poses a major constraint to vegetable and fiber production in Israel and the USA. While many biological parameters are known for begomovirus transmission, nothing is known about vector proteins involved in the specific interactions between begomoviruses and their whitefly vectors. Identifying such proteins is expected to lead to the design of novel control methods that interfere with whitefly-mediated begomovirus transmission. The project objectives were to: 1) Perform gene expression analyses using microarrays to study the response of whiteflies (B, Q and A biotypes) to the acquisition of begomoviruses (Tomato yellow leaf curl (TYLCV) and Squash leaf curl (SLCV). 2) Construct a whitefly proteome from whole whiteflies and dissected organs after begomovirus acquisition. 3) Validate gene expression by q-RTPCR and sub-cellular localization of candidate ESTs identified in microarray and proteomic analyses. 4) Verify functionality of candidate ESTs using an RNAi approach, and to link these datasets to overall functional whitefly anatomical studies. During the first and second years biological experiments with TYLCV and SLCV acquisition and transmission were completed to verify the suitable parameters for sample collection for microarray experiments. The parameters were generally found to be similar to previously published results by our groups and others. Samples from whole whiteflies and midguts of the B, A and Q biotypes that acquired TYLCV and SLCV were collected in both the US and Israel and hybridized to B. tabaci microarray. The data we analyzed, candidate genes that respond to both viruses in the three tested biotypes were identified and their expression that included quantitative real-time PCR and co-localization was verified for HSP70 by the Israeli group. In addition, experiments were undertaken to employ in situ hybridization to localize several candidate genes (in progress) using an oligonucleotide probe to the primary endosymbiont as a positive control. A proteome and corresponding transcriptome to enable more effective protein identification of adult whiteflies was constructed by the US group. Further validation of the transmission route of begomoviruses, mainly SLCV and the involvement of the digestive and salivary systems was investigated (Cicero and Brown). Due to time and budget constraints the RNAi-mediated silencing objective to verify gene function was not accomplished as anticipated. HSP70, a strong candidate protein that showed over-expression after TYLCV and SLCV acquisition and retention by B. tabaci, and co-localization with TYLCV in the midgut, was further studies. Besides this protein, our joint research resulted in the identification of many intriguing candidate genes and proteins that will be followed up by additional experiments during our future research. To identify these proteins it was necessary to increase the number and breadth of whitefly ESTs substantially and so whitefly cDNAs from various libraries made during the project were sequenced (Sanger, 454). As a result, the proteome annotation (ID) was far more successful than in the initial attempt to identify proteins using Uniprot or translated insect ESTs from public databases. The extent of homology shared by insects in different orders was surprisingly low, underscoring the imperative need for genome and transcriptome sequencing of homopteran insects. Having increased the number of EST from the original usable 5500 generated several years ago to >600,000 (this project+NCBI data mining), we have identified about one fifth of the whitefly proteome using these new resources. Also we have created a database that links all identified whitefly proteins to the PAVEdb-ESTs in the database, resulting in a useful dataset to which additional ESTS will be added. We are optimistic about the prospect of linking the proteome ID results to the transcriptome database to enable our own and other labs the opportunity to functionally annotate not only genes and proteins involved in our area of interest (whitefly mediated transmission) but for the plethora of other functionalities that will emerge from mining and functionally annotating other key genes and gene families in whitefly metabolism, development, among others. This joint grant has resulted in the identification of numerous candidate proteins involved in begomovirus transmission by B. tabaci. A next major step will be to capitalize on validated genes/proteins to develop approaches to interfere with the virus transmission.

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Rittman, Martyn, Xiaoli Chen, Chieh-Chih Estelle Cheng, Lulu Jiang i Jia Liu. Better Together: Facilitating FAIR Research Output Sharing (APAC time zones). Chair Ran Dang. Crossref, wrzesień 2022. http://dx.doi.org/10.13003/yzmm3339.

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Unique and persistent identifiers for researchers, institutes, and different types of research outputs, alongside comprehensive metadata, facilitates Findable, Accessible, Interoperable, and Reusable (FAIR) research. In the second webinar of the Better Together series hosted by Crossref, DataCite, and ORCID, we welcomed a guest co-organizer CSTR (Common Science and Technology Resource Identifier) to jointly present a session focused on the sharing of scholarly resources, leveraging both the global and local identifier infrastructure and services. We go into detail about how repositories can leverage open scholarly infrastructure to help researchers share more, cite more, and generate impact. Part of this webinar focuses on some use cases in the Mandarin-speaking community. However, the presentation is be conducted in English with slides in both English and Mandarin. In this webinar we covered the following topics: Who we are Besides papers, what other resources can be shared? What’s the difference between “sharing” and “publishing”? How our organizations work together to make different types of scholarly resources Findable, Accessible, Interoperable and Reusable Science Data Bank and how it integrates with identifiers in their workflow This webinar took place on 19 September 2022 at 6am UTC/ 14:00 Beijing. This webinar lasts 90 minutes including time for Q&A. 研究者、科研机构、和科研成果都能利用独特永久识别符(PID)及其背后丰富详尽的元数据,实现可查询、可获取、可互操作、可复用的FAIR科研数据原则。此次Crossref, DataCite, ORCID和通用科技资源标识符CSTR合办的线上宣讲会,将着重讨论机构存储库利用国际国内开放标识符基础设施,帮助研究者分享、引用不同类型研究成果,产生影响力。本次宣讲会以英文进行,幻灯片内容将以中英双语呈现。时间 2022年9月19日 06:00 上午世界标准时间UTC

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