Relevant bibliographies by topics / QSSA

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'QSSA'

Author: Grafiati
Published: 4 June 2021
Last updated: 15 February 2022

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Journal articles on the topic "QSSA"

1

Wu, Fangxi, Xi Luo, Lingqiang Wang, et al. "Genome-Wide Association Study Reveals the QTLs for Seed Storability in World Rice Core Collections." Plants 10, no. 4 (2021): 812. http://dx.doi.org/10.3390/plants10040812.

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Seed storability is a main agronomically important trait to assure storage safety of grain and seeds in rice. Although many quantitative trait loci (QTLs) and associated genes for rice seed storability have been identified, the detailed genetic mechanisms of seed storability remain unclear in rice. In this study, a genome-wide association study (GWAS) was performed in 456 diverse rice core collections from the 3K rice genome. We discovered the new nine QTLs designated as qSS1-1, qSS1-2, qSS2-1, qSS3-1, qSS5-1, qSS5-2, qSS7-1, qSS8-1, and qSS11-1. According to the analysis of the new nine QTLs, our results could well explain the reason why seed storability of indica subspecies was superior to japonica subspecies in rice. Among them, qSS1-2 and qSS8-1 were potentially co-localized with a known associated qSS1/OsGH3-2 and OsPIMT1, respectively. Our results also suggest that pyramiding breeding of superior alleles of these associated genes will lead to new varieties with improved seed storability in the future.
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Kotte, Ann-Kathrin, Oliver Severn, Zak Bean, Katrin Schwarz, Nigel P. Minton, and Klaus Winzer. "RRNPP-type quorum sensing affects solvent formation and sporulation in Clostridium acetobutylicum." Microbiology 166, no. 6 (2020): 579–92. http://dx.doi.org/10.1099/mic.0.000916.

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The strictly anaerobic bacterium Clostridium acetobutylicum is well known for its ability to convert sugars into organic acids and solvents, most notably the potential biofuel butanol. However, the regulation of its fermentation metabolism, in particular the shift from acid to solvent production, remains poorly understood. The aim of this study was to investigate whether cell–cell communication plays a role in controlling the timing of this shift or the extent of solvent formation. Analysis of the available C. acetobutylicum genome sequences revealed the presence of eight putative RRNPP-type quorum-sensing systems, here designated qssA to qssH, each consisting of an RRNPP-type regulator gene followed by a small open reading frame encoding a putative signalling peptide precursor. The identified regulator and signal peptide precursor genes were designated qsrA to qsrH and qspA to qspH, respectively. Triplicate regulator mutants were generated in strain ATCC 824 for each of the eight systems and screened for phenotypic changes. The qsrB mutants showed increased solvent formation during early solventogenesis and hence the QssB system was selected for further characterization. Overexpression of qsrB severely reduced solvent and endospore formation and this effect could be overcome by adding short synthetic peptides to the culture medium representing a specific region of the QspB signalling peptide precursor. In addition, overexpression of qspB increased the production of acetone and butanol and the initial (48 h) titre of heat-resistant endospores. Together, these findings establish a role for QssB quorum sensing in the regulation of early solventogenesis and sporulation in C. acetobutylicum .
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Wen, He, Huifang Dai, Zhaosheng Teng, Yuxiang Yang, and Fuhai Li. "Performance Comparison of Windowed Interpolation FFT and Quasisynchronous Sampling Algorithm for Frequency Estimation." Mathematical Problems in Engineering 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/745830.

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The DFT-based frequency estimations have inherent limitations such as spectral leakage and picket-fence effect due to asynchronous sampling. This paper focuses on comparing the windowed interpolation FFT (WIFFT) and quasisynchronous sampling algorithm (QSSA) for frequency estimation. The WIFFT uses windows to reduce spectral leakage and employs interpolation algorithm to eliminate picket-fence effect. And the QSSA utilizes quasisynchronous weighted iterations for frequency estimation. The accuracy and time complexity of WIFFT and QSSA are theoretically studied. Computer simulations of frequency estimations with noise and fluctuations by using WIFFT and QSSA are performed. Simulations results show that the wideband noise sensitivity of QSSA is lower than that of WIFFT. However, the WIFFT exhibits less time complexity than QSSA.
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Boulier, François, and François Lemaire. "Differential algebra and QSSA methods in biochemistry." IFAC Proceedings Volumes 42, no. 10 (2009): 33–38. http://dx.doi.org/10.3182/20090706-3-fr-2004.00004.

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Sun, Qibo, Shangguang Wang, Hua Zou, and Fangchun Yang. "QSSA: A QoS-aware Service Selection Approach." International Journal of Web and Grid Services 7, no. 2 (2011): 147. http://dx.doi.org/10.1504/ijwgs.2011.040446.

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Gao, Hongyuan, Yangyang Hou, Shibo Zhang, and Ming Diao. "An Efficient Approximation for Nakagami-mQuantile Function Based on Generalized Opposition-Based Quantum Salp Swarm Algorithm." Mathematical Problems in Engineering 2019 (August 14, 2019): 1–13. http://dx.doi.org/10.1155/2019/8291063.

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With the further research in communication systems, especially in wireless communication systems, a statistical model called Nakagami-mdistribution appears to have better performance than other distributions, including Rice and Rayleigh, in explaining received faded envelopes. Therefore, the Nakagami-mquantile function plays an important role in numerical calculations and theoretical analyses for wireless communication systems. However, it is quite difficult to operate numerical calculations and theoretical analyses because Nakagami-mquantile function has no exact closed-form expression. In order to obtain the closed-form expression that is able to fit the curve of Nakagami-mquantile function as well as possible, we adopt the method of curve fitting in this paper. An efficient expression for approximating the Nakagami-mquantile function is proposed first and then a novel heuristic optimization algorithm—generalized opposition-based quantum salp swarm algorithm (GO-QSSA)—which contains quantum computation, intelligence inspired by salp swarm and generalized opposition-based learning strategy in quantum space, to compute the coefficients of the proposed expression. Meanwhile, we compare GO-QSSA with three swarm intelligence algorithms: artificial bee colony algorithm (ABC), particle swarm optimization algorithm (PSO), and salp swarm algorithm (SSA). The comparing simulation results reveal that GO-QSSA owns faster convergence speed than PSO, ABC, and SSA. Moreover, GO-QSSA is capable of computing more accurately than traditional algorithms. In addition, the simulation results show that compared with existing curve-fitting-based methods, the proposed expression decreases the fitting error by roughly one order of magnitude in most cases and even higher in some cases. Our approximation is proved to be simple and efficient.
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Whitehouse, L. E., A. S. Tomlin, and M. J. Pilling. "Systematic reduction of complex tropospheric chemical mechanisms, Part I: sensitivity and time-scale analyses." Atmospheric Chemistry and Physics 4, no. 7 (2004): 2025–56. http://dx.doi.org/10.5194/acp-4-2025-2004.

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Abstract. Explicit mechanisms describing the complex degradation pathways of atmospheric volatile organic compounds (VOCs) are important, since they allow the study of the contribution of individual VOCS to secondary pollutant formation. They are computationally expensive to solve however, since they contain large numbers of species and a wide range of time-scales causing stiffness in the resulting equation systems. This paper and the following companion paper describe the application of systematic and automated methods for reducing such complex mechanisms, whilst maintaining the accuracy of the model with respect to important species and features. The methods are demonstrated via application to version 2 of the Leeds Master Chemical Mechanism. The methods of Jacobian analysis and overall rate sensitivity analysis proved to be efficient and capable of removing the majority of redundant reactions and species in the scheme across a wide range of conditions relevant to the polluted troposphere. The application of principal component analysis of the rate sensitivity matrix was computationally expensive due to its use of the decomposition of very large matrices, and did not produce significant reduction over and above the other sensitivity methods. The use of the quasi-steady state approximation (QSSA) proved to be an extremely successful method of removing the fast time-scales within the system, as demonstrated by a local perturbation analysis at each stage of reduction. QSSA species were automatically selected via the calculation of instantaneous QSSA errors based on user-selected tolerances. The application of the QSSA led to the removal of a large number of alkoxy radicals and excited Criegee bi-radicals via reaction lumping. The resulting reduced mechanism was shown to reproduce the concentration profiles of the important species selected from the full mechanism over a wide range of conditions, including those outside of which the reduced mechanism was generated. As a result of a reduction in the number of species in the scheme of a factor of 2, and a reduction in stiffness, the computational time required for simulations was reduced by a factor of 4 when compared to the full scheme.
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Chen, Rongzhong, Chen Dong, Yin Ye, Zhenyi Chen, and Yanhua Liu. "QSSA: Quantum Evolutionary Salp Swarm Algorithm for Mechanical Design." IEEE Access 7 (2019): 145582–95. http://dx.doi.org/10.1109/access.2019.2945842.

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9

Whitehouse, L. E., A. S. Tomlin, and M. J. Pilling. "Systematic reduction of complex tropospheric chemical mechanisms using sensitivity and time-scale analyses." Atmospheric Chemistry and Physics Discussions 4, no. 4 (2004): 3721–83. http://dx.doi.org/10.5194/acpd-4-3721-2004.

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Abstract. Explicit mechanisms describing the complex degradation pathways of atmospheric volatile organic compounds (VOCs) are important, since they allow the study of the contribution of individual VOCS to secondary pollutant formation. They are computationally expensive to solve however, since they contain large numbers of species and a wide range of time-scales causing stiffness in the resulting equation systems. This paper and the following companion paper describe the application of systematic and automated methods for reducing such complex mechanisms, whilst maintaining the accuracy of the model with respect to important species and features. The methods are demonstrated via application to version 2 of the Leeds Master Chemical Mechanism. The methods of local concentration sensitivity analysis and overall rate sensitivity analysis proved to be efficient and capable of removing the majority of redundant reactions and species in the scheme across a wide range of conditions relevant to the polluted troposphere. The application of principal component analysis of the rate sensitivity matrix was computationally expensive due to its use of the decomposition of very large matrices, and did not produce significant reduction over and above the other sensitivity methods. The use of the quasi-steady state approximation (QSSA) proved to be an extremely successful method of removing the fast time-scales within the system, as demonstrated by a local perturbation analysis at each stage of reduction. QSSA species were automatically selected via the calculation of instantaneous QSSA errors based on user-selected tolerances. The application of the QSSA led to the removal of a large number of alkoxy radicals and excited Criegee bi-radicals via reaction lumping. The resulting reduced mechanism was shown to reproduce the concentration profiles of the important species selected from the full mechanism over a wide range of conditions, including those outside of which the reduced mechanism was generated. As a result of a reduction in the number of species in the scheme of a factor of 2, and a reduction in stiffness, the computational time required for simulations was reduced by a factor of 4 when compared to the full scheme.
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Lu, Tzyy-Chyang, and Jyh-Ching Juang. "Quantum-inspired space search algorithm (QSSA) for global numerical optimization." Applied Mathematics and Computation 218, no. 6 (2011): 2516–32. http://dx.doi.org/10.1016/j.amc.2011.07.067.

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Dissertations / Theses on the topic "QSSA"

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Schnell, Santiago. "On the quasi-steady-state approxiamation : coenzyme-substrate reactions as a case study." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249207.

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Liu, Zhen. "Stochastic Simulation Methods for Biochemical Systems with Multi-state and Multi-scale Features." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/19191.

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In this thesis we study stochastic modeling and simulation methods for biochemical systems. The thesis is focused on systems with multi-state and multi-scale features and divided into two parts. In the first part, we propose new algorithms that improve existing multi-state simulation methods. We first compare the well known Gillespie\\\'s stochastic simulation algorithm (SSA) with the StochSim, an agent-based simulation method. Based on the analysis, we propose a hybrid method that possesses the advantages of both methods. Then we propose two new methods that extend the Network-Free Algorithm (NFA) for rule-based models. Numerical results are provided to show the performance improvement by our new methods. In the second part, we investigate two simulation schemes for the multi-scale feature: Haseltine and Rawlings\\\' hybrid method and the quasi-steady-state stochastic simulation method. We first propose an efficient partitioning strategy for the hybrid method and an efficient way of building stochastic cell cycle models with this new partitioning strategy. Then, to understand conditions where the two simulation methods can be applied, we develop a way to estimate the relaxation time of the fast sub-network, and compare it with the firing interval of the slow sub-network. Our analysis are verified by numerical experiments on different realistic biochemical models.<br>Ph. D.
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Pu, Yang. "The Art of Modeling and Simulation of Multiscale Biochemical Systems." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/52347.

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In this thesis we study modeling and simulation approaches for multiscale biochemical systems. The thesis addresses both modeling methods and simulation strategies. In the first part, we propose modeling methods to study the behavior of the insulin secretion pathway. We first expand the single cell model proposed by Bertram et. al. to model multiple cells. Synchronization among multiple cells is observed. Then an unhealthy cell model is proposed to study the insulin secretion failure caused by weakening of mitochondria function. By studying the interaction between the healthy and unhealthy cells, we find that the insulin secretion can be reinstated by increasing the glucokinase level. This new discovery sheds light on antidiabetic medication. In order to study the stochastic dynamics of the insulin secretion pathway, we first apply the hybrid method to model the discrete events in the insulin secretion pathway. Based on the hybrid model, a probability based measurement is proposed and applied to test the new antidiabetic remedy. In the second part, we focus on different simulation schemes for multiscale biochemical systems. We first propose a partitioning strategy for the hybrid method which leads to an efficient way of building stochastic cell cycle models. Then different implementation methods for the hybrid method are studied. A root finding method based on inverse interpolation is introduced to implement the hybrid method with three different ODE solvers. A detailed discussion of the performance of these three ODE solvers is presented. Last, we propose a new strategy to automatically detect stiffness and identify species that cause stiffness for the Tau-Leaping method, as well as two stiffness reduction methods. The efficiency is demonstrated by applying this new strategy on a stiff decaying dimerization model and a heat shock protein regulation model.<br>Ph. D.
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Severn, Oliver. "QssB : a pleiotropic RNPP-type cell-cell communication system in C. acetobutylicum ATCC 824." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/51672/.

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Clostridium acetobutylicum is renowned for the ability to convert sugars into acids and solvents, including the potential biofuel butanol. However, regulation of its fermentation metabolism remains poorly understood, especially regarding the shift from acid to solvent metabolism. Several RNPP-type cell-cell communication systems have recently been discovered within C. acetobutylicum ATCC 824. The aim of this study was to investigate one such system, Quorum Sensing System B (QssB), consisting of a regulator, QsrB, and a signalling peptide of unknown structure derived from a precursor protein, QspB. The primary objectives were to characterise this system in greater detail, its effects on metabolism and endospore formation, and to gain insights into the nature of the signalling process. Overexpression of qsrB confirmed a dramatic reduction of solvent production and sporulation, and revealed increased production of acetate and butyrate, with considerably decreased consumption of glucose. These phenotypes were overcome by the addition of synthetically produced peptides matching the C-terminal region of the conjugate signalling peptide QspB. In doing so, the minimum peptide sequence required to relieve the effects of qsrB overexpression was shown to be the heptamer AEPTWGW. The system was shown to be highly selective for this sequence, with an alanine scan showing the sequential reduction in biological activity. QssB did not engage in cross talk with the other RNPP-type systems present within the organism, or with a homologous system discovered in Clostridium roseum, further evidence of selectivity. Attempts were made to identify the Specific Binding Protein (SBP) required for QspB uptake via ABC transport. ClosTron mutation of two SBP encoding genes, CA_0176 and CA_C3632, conferred resistance to the effects of QsrB overproduction on sporulation. An iTRAQ-based proteomics approach was used to study the wider effects of qsrB overexpression, as well as their alleviation via synthetic peptide. This analysis confirmed that the qsrB overexpressing strain remained in an acidogenic state which could be overcome though peptide addition. Although glucose consumption was decreased upon QsrB overproduction, key glycolysis enzymes were found to be upregulated. The stationary phase regulator CA_C0957 was found to be downregulated under these conditions, whereas proteins associated with motility and chemotaxis increased in abundance. GusA reporter assays supported the former, whilst swimming and swarming assays remained inconclusive. Enzyme assays revealed increased acetate and butyrate kinase activity, agreeing with the acidogenic state suggested from the iTRAQ analysis. QsrB was confirmed to be a repressor of solvent production and the production of endospores, with new evidence indicating further complexity.
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Wang, Kunrong. "High-Frequency Quasi-Single-Stage (QSS) Isolated AC-DC and DC-AC Power Conversion." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/29394.

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The generic concept of quasi-single-stage (QSS) power conversion topology for ac-dc rectification and dc-ac inversion is proposed. The topology is reached by direct cascading and synchronized switching of two variety of buck or two variety of boost switching networks. The family of QSS power converters feature single-stage power processing without a dc-link low-pass filter, a unidirectional pulsating dc-link voltage, soft-switching capability with minimal extra commutation circuitry, simple PWM control, and high efficiency and reliability. A new soft-switched single-phase QSS bi-directional inverter/rectifier (charger) topology is derived based on the QSS power conversion concept. A simple active voltage clamp branch is used to clamp the otherwise high transient voltage on the current-fed ac side, and at the same time, to achieve zero-voltage-switching (ZVS) for the switches in the output side bridge. Seamless four-quadrant operation in the inverter mode, and rectifier operation with unity power factor in the charger (rectifier) mode are realized with the proposed uni-polar center-aligned PWM scheme. Single-stage power conversion, standard half-bridge connection of devices, soft-switching for all the power devices, low conduction loss, simple center-aligned PWM control, and high reliability and efficiency are among its salient features. Experimental results on a 3 kVA bi-directional inverter/rectifier prototype validate the reliable operation of the circuit. Other single-phase and three-phase QSS bi-directional inverters/rectifiers can be easily derived as topological extensions of the basic QSS bi-directional inverter/rectifier. A new QSS isolated three-phase zero-voltage/zero-current-switching (ZVZCS) buck PWM rectifier for high-power off-line applications is also proposed. It consists of a three-phase buck bridge switching under zero current and a phase-shift-controlled full-bridge with ZVZCS, while no intermediate dc-link is involved. Input power and displacement factor control, input current shaping, tight output voltage regulation, high-frequency transformer isolation, and soft-switching for all the power devices are realized in a unified single stage. Because of ZVZCS and single-stage power conversion, it can operate at high switching frequency while maintaining reliable operation and achieving higher efficiency than standard two-stage approaches. A family of isolated ZVZCS buck rectifiers are obtained by incorporating various ZVZCS schemes for full-bridge dc-dc converters into the basic QSS isolated buck rectifier topology. Experimental and simulation results substantiate the reliable operation and high efficiency of selected topologies. The concept of charge control (or instantaneous average current control) of three-phase buck PWM rectifiers is introduced. It controls precisely the average input phase currents to track the input phase voltages by sensing and integrating only the dc rail current, realizes six-step PWM, and features simple implementation, fast dynamic response, excellent noise immunity, and is easy to realize with analog circuitry or to integrate. One particular merit of the scheme is its capability to correct any duty-cycle distortion incurred on only one of the two active duty-cycles which often happens in the soft-switched buck rectifiers, another merit is the smooth transition of the input currents between the 60o sectors. Simulation and preliminary experimental results show that smooth operations and high quality sinusoidal input currents in the full line cycle are achieved with the control scheme.<br>Ph. D.
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Pettazzoni, Laura. "Il Sistema di Gestione Integrata QSA per la miniera di acque termominerali di Porretta Terme." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amslaurea.unibo.it/930/.

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Sana, Thibault. "Caractérisation de deux systèmes de sécrétion de type VI de Pseudomonas aeruginosa : Cross-régulation et rôle dans l'invasion microtubules-dépendante de cellules non-phagocytaires." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4027.

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Pseudomonas aeruginosa est une bactérie pathogène opportuniste extracellulaire. La souche PAO1 de P. aeruginosa possède trois loci codant des Systèmes de Sécrétion de Type VI (T6SS) indépendants, nommés H1 à H3-T6SS. Le premier d'entre eux, H1-T6SS, a été largement décrit dans la littérature scientifique et injecte des toxines à activité antiprocaryote dans d'autres bactéries permettant une défense active contre l'attaque d'un T6SS d'une autre bactérie. Les deux autres T6SS de P. aeruginosa sont probablement des facteurs de virulence de cette bactérie, mais aucun effecteur sécrété, ni cible intracellulaire ou rôle n'ont été proposés jusqu'ici. Dans ce travail de thèse, nous avons mis en évidence que la machinerie H2-T6SS permet l'invasion de cellules non-phagocytaires et participe à la virulence de P. aeruginosa. Cette entrée requière la dynamique du réseau de microtubules, via VgrG2b injectée par la machinerie H2-T6SS dans les cellules épithéliales, et capable de cibler les complexes de gamma-tubulines, centre nucléateur des microtubules. Il s'agit d'un mécanisme d'internalisation tout à fait original et jamais encore décrit. Nous avons également exploré la régulation croisée entre H2 et H3-T6SS. Enfin par une analyse de « RNAseq », nous avons observé entre les souches PAO1 et PA14 de P. aeruginosa une expression différentielle de nombreux gènes, certains codant des facteurs de virulence. Pour près de 30% d'entre eux, l'origine de cette variation reposerait sur une quasi-absence d'expression dans la souche PA14 de qslA, codant un anti-activateur du Quorum-Sensing. Ceci serait une nouvelle explication du phénotype hyper-virulent de la souche PA14 de P. aeruginosa<br>Pseudomonas aeruginosa is an opportunistic extracellular pathogen. The PAO1 strain of P. aeruginosa harbors three loci encoding independent Type VI Secretion Systems (T6SS), named H1 to H3-T6SS. H1-T6SS has been widely described in the literature and injects toxins with antiprokaryotic activity in target bacteria, allowing an active defense against the attack of a T6SS from another bacterium. The other two T6SS of P. aeruginosa are likely virulence factors, but no secreted effector or intracellular target or role have been proposed so far.In this work, we demonstrated that the H2-T6SS machinery triggered the invasion of non-phagocytic epithelial cells and is involved in the virulence of P. aeruginosa. This uptake is mediated by the microtubule network dynamics, and via VgrG2b, injected by the H2-T6SS machinery in epithelial cells, to target the gamma-tubulin complex, the microtubule nucleating center. This is an original mechanism of internalization never described before. We also studied the cross-regulation between H2 and H3-T6SS. Finally through a « RNAseq » analysis, we observed differential expression of many genes, including some encoding virulence factors, between PAO1 and PA14 strains of P. aeruginosa. For nearly 30% of them, the origin of this variation is an almost lack of expression in the PA14 strain of qslA, encoding an anti-Quorum Sensing activator. This can be a new explanation of hyper-virulent phenotype of the PA14 strain of P. aeruginosa
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Eriksson, Tommie. "Parallel Hybridization of a Heavy-Duty Long Hauler." Thesis, Linköpings universitet, Fordonssystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119884.

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Long haulage of heavy-duty trucks weighing over 15-ton stands for nearly 50% of the fuelconsumption among trucks, making them the most fuel consuming category. This indicatesthe potential benefits in improving the fuel efficiency for said category. Hybridization is onepossible solution.Hybrid vehicles are vehicles with two or more power sources in the powertrain. Differentpowertrain configurations, hybridization levels and hybrid concepts are best suitedfor different applications. With prices for fossil fuels constantly rising hybridization is animportant technology to improve fuel efficiency.Different variations of configurations and concepts enables many choices when decidingon a hybrid driveline. A simulation tool for efficiently comparing various hybrid drivelineswould be a great asset when deciding on a configuration for a certain vehicle application. Forthis thesis the application in focus is the previously mentioned category, a heavy duty longhauler weighing 36-ton.The modeling approach used for the simulation tool is called quasistatic modeling or"backward modeling". This name comes from, based on a chosen drive cycle, the resistingforces which act on the vehicle can statically be calculated at each step from the velocityprofile. The required power to drive along the drive cycle can then be calculated backwardswithin the powertrain resulting in a fuel consumption for the combustion engine. For thisthe free QSS-toolbox for Matlab Simulink has been used as a base and modified when needed.The configuration chosen to be implemented is a parallel electric hybrid and was chosenfor its good characteristics for the type of driving highways provide. For this configurationtwo types of controllers are used, one being an Equivalent Consumption Minimization Strategycontroller and the other a simple, rule based heuristic controller.The results for both controllers show small benefits with hybridization of the longhauler compared with the conventional which in the long run would make bigger differencebecause of the large consumption in whole. A sensitivity analysis was also done showingthat improving conventional vehicle parameters can be as beneficial as hybridization.
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Reel, Brian H. "A FLIGHT SIMULATION STUDY OF THE SIMULTANEOUS NON-INTERFERING AIRCRAFT APPROACH." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/80.

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Using a new implementation of a NASA flight simulation of the Quiet Short-Haul Research Aircraft, autopilots were designed to be capable of flying both straight in (ILS) approaches, and circling (SNI) approaches. A standard glideslope coupler was sufficient for most conditions, but a standard Proportional-Integral-Derivative (PID) based localizer tracker was not sufficient for maintaining a lateral track on the SNI course. To track the SNI course, a feed-forward system, using GPS steering provided much better results. NASA and the FAA embrace the concept of a Simultaneous, Non-Interfering (SNI) approach as a way to increase airport throughput while reducing the noise footprints of aircraft on approach. The NASA concept for the SNI approach for Short Takeoff and Landing (STOL) aircraft involves a straight in segment flown above the flight path of a normal approach, followed by a spiraling descent to the runway. As this is a procedure that would be utilized by regional airliners, it is assumed that it would be conducted under Instrument Flight Rules (IFR). GPS or INS guidance would be required to fly this approach, and it is likely that it would be necessary to fly the approach with a coupled autopilot: a stabilized, curving, instrument approach to decision altitude would be exceedingly difficult to fly. The autopilots in many current commuter and general aviation aircraft, however, were designed before the event of GPS, and do not have provisions for tracking curved paths. This study identifies problem areas in implementing the SNI circling approach on aircraft and avionics as they stand today and also gives examples of what can be done for the SNI approach to be successful.
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Yurdanur, Elif. "Theoretical Investigation Of Laser Produced Ni-like Sn Plasma." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607568/index.pdf.

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In this thesis, theoretical investigation of nickel-like tin plasma is presented. X-ray production in a plasma medium produced by a laser beam is reviewed. Applications mostly, lithography are discussed. Two different schemes for x-ray lasing, namely, quasi-steady state and transient collisional excitation are explained and compared. The computer codes that are used for plasma, especially for laser produced plasma and x-ray laser including hydrodynamic codes, ray-trace codes and collisional radiative codes are discussed. The code used in this work, EHYBRID, is considered in more detail. An experimental setup which can allow x-ray lasing is designed for different plasma and laser parameters are analyzed by means of EHYBRID code. Results are briefly discussed and as a future work the realization of the related experiment is mentioned.
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Books on the topic "QSSA"

1

Stephenson, Jack D. Longitudinal stability and control characteristics of the Quiet Short-Haul Research Aircraft (QSRA). Ames Research Center, 1989.

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Stephenson, Jack D. Lateral-directional stability and control characteristics of the quiet short-haul research aircraft (QSRA). National Aeronautics and Space Administration, Ames Research Center, 1990.

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ʼIbrāhimi, Mḥamad Ṣāl̆ḥ. Ganjina-y farhang u-zānin yā qsa-y by̆zhāwar-i wy̆zhrāwar-i pārāw-i zmān-i Kurdi. M. S. ʼIbrāhimi, 1992.

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W, Riddle Dennis, Stevens Victor C, and Ames Research Center, eds. Flight measured downwash of the QSRA. National Aeronautics and Space Administration, Ames Research Center, 1988.

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Quality system assessment: QSA. 2nd ed. Chrysler Corporation, 1998.

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Quality system assessment: QSA. Chrysler Corporation, 1994.

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H, Hardy Gordon, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Longitudinal stability and control characteristics of the Quiet Short-Haul Research Aircraft (QSRA). National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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A, Jeske James, Hardy Gordon H, and Ames Research Center, eds. Lateral-directional stability and control characteristics of the quiet short-haul research aircraft (QSRA). National Aeronautics and Space Administration, Ames Research Center, 1990.

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A, Jeske James, Hardy Gordon H, and Ames Research Center, eds. Lateral-directional stability and control characteristics of the quiet short-haul research aircraft (QSRA). National Aeronautics and Space Administration, Ames Research Center, 1990.

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Hargreaves, John. Aberdeen University, 1945-1981: Regional Roles and National Needs (Qsha Quincentennial Studies in the History of the University of Aberdeen). University of Aberdeen Press, 1990.

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Book chapters on the topic "QSSA"

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Pantea, Casian, Ankur Gupta, James B. Rawlings, and Gheorghe Craciun. "The QSSA in Chemical Kinetics: As Taught and as Practiced." In Discrete and Topological Models in Molecular Biology. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40193-0_20.

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Bobadilla, Ana Victoria Ponce, Bartosz Jan Bartmanski, Ramon Grima, and Hans G. Othmer. "The Status of the QSSA Approximation in Stochastic Simulations of Reaction Networks." In 2018 MATRIX Annals. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38230-8_10.

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Petroianu, Georg, and Peter Michael Osswald. "Querschnittsyndrom (QSS)." In Anästhesie in Frage und Antwort. Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-662-05716-2_60.

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Petroianu, Georg, and Peter Michael Osswald. "Querschnittsyndrom (QSS)." In Anästhesie in Frage und Antwort. Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-662-05717-9_99.

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Petroianu, Georg, and Peter Michael Osswald. "Querschnittsyndrom (QSS)." In Anästhesie in Frage und Antwort. Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-05715-5_139.

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Allen, A. J. "QSAS, QM Science Analysis Software." In Astrophysics and Space Science Proceedings. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3499-1_14.

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Peters, Luisa, Andreas Herz, Inga Truschkat, et al. "Qualitative Strukturale Analyse (QSA) meets Organisationsforschung." In Organisation und Pädagogik. Springer Fachmedien Wiesbaden, 2018. http://dx.doi.org/10.1007/978-3-658-20372-6_9.

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Sherif, Victoria. "Qualitative secondary analysis (QSA) as a research methodology." In Secondary Research Methods in the Built Environment. Routledge, 2021. http://dx.doi.org/10.1201/9781003000532-4.

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Haridas, Deepthi, Rakesh Shukla, Hari Om Prakash, et al. "QSecret-Sharing Scheme (QSS)-Based Keyless: Titanium Secure (TitaniumSec) EMail Application." In First International Conference on Sustainable Technologies for Computational Intelligence. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0029-9_25.

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More, S. S., and B. P. Ronge. "Implementing the QSS Model in Terry Towel Industry for Reduction in Rejection: A Case Study." In Techno-Societal 2018. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-16962-6_54.

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Conference papers on the topic "QSSA"

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van Vliet, E., R. O. Fox, J. J. Derksen, and S. B. Pope. "Treatment of Fast Chemistry in FDF/LES: In Situ Adaptive Tabulation." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-3119.

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The feasibility to implement fast-chemistry reactions in a three-dimensional large eddy simulation (LES) of a turbulent reacting flow using a filtered density function (FDF) technique is studied. Low-density polyethylene (LDPE) is used as an representative reaction due to the stiff nature of the ordinary differential equation (ODE’s) describing the kinetics. In FDF/LES, the chemistry needs to be evaluated many times for a large number of fictitious particles that are tracked in the flow, and therefore a constraint is put to the CPU time needed to solve the kinetics. Pope (1997) developed an in situ adaptive tabulation (ISAT) to treat complex chemistry computationally very efficiently when many evaluations of the chemistry are needed. Kolhapure and Fox (1999) successfully applied ISAT to LDPE using a quasi steady state assumption (QSSA). In the present paper, the aim is to optimize the latest version (ISAT Version 4.0, Pope, 2003) for the full LDPE reaction (i.e. without QSSA), in terms of accuracy and speed up by varying the error tolerance and the number of trees used by ISAT. For this purpose, a pairwise mixing stirred reactor (PMSR) is employed, since it forms a stringent test for the chemistry solver due to the large accessed region of composition space that can be established. For a number of trees of Ntree = 8 and an error tolerance of εtol = 10−5 the best overall performance of ISAT was obtained: compared with direct integration, a speed up factor of more than ten combined with an relative error in temperature of about 1% was found.
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"Message from the QSOA Track Chairs." In 2008 34th Euromicro Conference Software Engineering and Advanced Applications. IEEE, 2008. http://dx.doi.org/10.1109/seaa.2008.9.

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DARSHANI, CHARIKA, K. I. RIDMIKA, and B. A. K. S. PERERA. "LIFE MANAGEMENT OF CONTRACTOR’S SITE QUANTITY SURVEYOR." In 13th International Research Conference - FARU 2020. Faculty of Architecture Research Unit (FARU), University of Moratuwa, 2020. http://dx.doi.org/10.31705/faru.2020.11.

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Life management controls the quality of one’s work while ensuring one’s quality of life with minimum conflicts. The contractor’s site quantity surveyor (QS), who has to shoulder many responsibilities on-site amongst time constraints, can most probably experience a life imbalance. Because the personal responsibilities of female and male site QSs differ, the aim of this study was to identify the strategies that will enhance the life management of contractor’s site quantity surveyors. The qualitative approach was adopted in the study, and the required empirical data were collected by interviewing 20 females and 20 males contractor’s site QSs. The interview findings were analysed using manual content analysis. Thirty-one and twenty-eight causes of life imbalance in male and female QSs respectively were identified. In addition, 50 and 48 strategies that will facilitate satisfactory life management in male and female QSs, respectively were identified. Some of the identified causes and strategies were common to both male and females QSs.
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Patel, Chintan, Ernesto Staroswiecki, Smita Pawar, Dhruva Acharyya, and Jim Plusquellic. "Diagnosis Using Quiescent Signal Analysis on a Commercial Power Grid." In ISTFA 2002. ASM International, 2002. http://dx.doi.org/10.31399/asm.cp.istfa2002p0713.

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Abstract Quiescent Signal Analysis (QSA) is a novel electrical-test-based diagnostic technique that uses IDDQ measurements made at multiple chip supply pads as a means of locating shorting defects in the layout. The use of multiple supply pads reduces the adverse effects of leakage current by scaling the total leakage current over multiple measurements. In previous work, a resistance model for QSA was developed and demonstrated on a small circuit. In this paper, the weaknesses of the original QSA model are identified, in the context of a production power grid (PPG) and probe card model, and a new model is described. The new QSA algorithm is developed from the analysis of IDDQ contour plots. A “family” of hyperbola curves is shown to be a good fit to the contour curves. The parameters to the hyperbola equations are derived with the help of inserted calibration transistors. Simulation experiments are used to demonstrate the prediction accuracy of the method on a PPG.
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Xudong Jiang, Wei Li, and Ning Li. "QSSB mixer design for MB-OFDM UWB frequency synthesizer." In 2007 7th International Conference on ASIC. IEEE, 2007. http://dx.doi.org/10.1109/icasic.2007.4415724.

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Barzen, Johanna, Frank Leymann, Karoline Wild, and Sebastian Feld. "1st Workshop on Quantum Software Architecture (QSA)." In 2021 IEEE 18th International Conference on Software Architecture Companion (ICSA-C). IEEE, 2021. http://dx.doi.org/10.1109/icsa-c52384.2021.00024.

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Bergero, Federico, Akshay Ranade, and Francesco Casella. "QSS and multi-rate simulation of object-oriented models." In EOOLT '16: 7th International Workshop on Equation-Based Object-Oriented Modeling Languages and Tools. ACM, 2016. http://dx.doi.org/10.1145/2904081.2904091.

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Caputo, Antonio C., Renato Giannini, and Fabrizio Paolacci. "Quantitative Seismic Risk Assessment of Process Plants: State of the Art Review and Directions for Future Research." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45374.

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Earthquakes represent a class of Natural-Technical hazards which in the past has been responsible of major accidents and significant losses in many industrial sites. However, while codes and standards have been issued to design specific structures and equipment in the civil and industrial domain, established procedures for Quantitative Seismic Risk Assessment (QSRA) of process plants are not yet available. In this paper a critical review of seismic risk assessment methods applicable to process plants is carried out. Their limitations are highlighted and areas needing further research are identified.
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Wei, Zun, Haiyun Wang, Ying Chen, et al. "Electromagnetic transient simulation of induction machine based on QSS algorithm." In 2015 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2015. http://dx.doi.org/10.1109/appeec.2015.7380954.

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Cocchi, M., M. C. Menziani, F. Fanelli та P. G. de Benedetti. "Theoretical QSAR and QSSR analyses of 5-HT1A serotonin and α1-adrenergic receptors ligands". У The first European conference on computational chemistry (E.C.C.C.1). AIP, 1995. http://dx.doi.org/10.1063/1.47824.

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