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Academic literature on the topic 'LV redundancy'
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Journal articles on the topic "LV redundancy"
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Jacobellis, George, Farhan Gandhi, and Matthew Floros. "Using Control Redundancy for Power and Vibration Reduction on a Coaxial Rotor Helicopter at High Speeds." Journal of the American Helicopter Society 64, no. 3 (July 1, 2019): 1–15. http://dx.doi.org/10.4050/jahs.64.032008.
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This study uses the Rotorcraft Comprehensive Analysis System (RCAS) to examine the effect of control redundancy on power and vibratory hub loads of a lift-offset coaxial rotor helicopter operating at 230 kt cruise speed. An aircraft nose-up pitch attitude of 3° resulted in very low main rotor power (less than 10% of the total power), with the majority of the power consumption attributed to an efficient axial propeller. At this 3° pitch attitude, the rotor speed and differential lateral pitch, which are redundant controls, were parametrically varied, and low power (LP) and low vibration (LV) states identified. The LP state (80% Nr and 3° differential lateral) required 3.5% lower power than the LV state (90% Nr and 0° differential lateral), but the latter had substantially lower 3/rev vibratory hub loads. The lower power in the LP state is primarily due to reduced main rotor power on account of smaller drag on the advancing blade tip at lower rotor speeds. The rotor drag is comparable for the two states, but the LV state has larger drag contributions from the advancing side, whereas the LP state has larger contributions from the reverse flow region (accounting for 14% of the total rotor drag) due to higher pitch on the retreating side and larger reverse flow velocities. Even so, the rotor drag accounts for under 30% of the total propulsor thrust requirement, with the fuselage (and hub) drag being the dominant component. Rotor L/De values for the LP and LV states were 12.3 and 11.3, respectively.
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Dresher, B. Elan. "The motivation for contrastive feature hierarchies in phonology." Linguistic Variation 15, no. 1 (September 21, 2015): 1–40. http://dx.doi.org/10.1075/lv.15.1.01dre.
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The notion that phonological features are organized into contrastive hierarchies has been entertained at different times in the history of linguistics. My main focus will be on the motivation for such hierarchies: what principles govern the ordering of the features? I will show that they have been motivated by three different principles: a) Activity: to identify the contrastive features that are relevant to the phonological computation, b) Minimality: to minimize redundancy in phonological representations and to maximize the amount of information conveyed by each feature, and c) Universality: to express universal tendencies in the nature of phonological inventories and the order of acquisition of feature contrasts. These principles do not necessarily conflict in every case, but in practice situations arise where they lead in different directions. To some extent Jakobson and Halle (Jakobson & Halle 1956; Halle 1959) and Clements (2001; 2003; 2009) appeal to all these principles, though they do so with differing emphases: Jakobson began by appealing to Activity, Halle came to stress Minimality, and Clements focused on Universality. I will argue on behalf of the centrality of Activity, which I understand to be the original and most compelling motivation for feature hierarchies.
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Linscheid, Nora, Pi Camilla Poulsen, Ida Dalgaard Pedersen, Emilie Gregers, Jesper Hastrup Svendsen, Morten Salling Olesen, Jesper Velgaard Olsen, Mario Delmar, and Alicia Lundby. "Quantitative Proteomics of Human Heart Samples Collected In Vivo Reveal the Remodeled Protein Landscape of Dilated Left Atrium Without Atrial Fibrillation." Molecular & Cellular Proteomics 19, no. 7 (April 14, 2020): 1132–44. http://dx.doi.org/10.1074/mcp.ra119.001878.
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Genetic and genomic research has greatly advanced our understanding of heart disease. Yet, comprehensive, in-depth, quantitative maps of protein expression in hearts of living humans are still lacking. Using samples obtained during valve replacement surgery in patients with mitral valve prolapse (MVP), we set out to define inter-chamber differences, the intersect of proteomic data with genetic or genomic datasets, and the impact of left atrial dilation on the proteome of patients with no history of atrial fibrillation (AF).We collected biopsies from right atria (RA), left atria (LA) and left ventricle (LV) of seven male patients with mitral valve regurgitation with dilated LA but no history of AF. Biopsy samples were analyzed by high-resolution mass spectrometry (MS), where peptides were pre-fractionated by reverse phase high-pressure liquid chromatography prior to MS measurement on a Q-Exactive-HF Orbitrap instrument. We identified 7,314 proteins based on 130,728 peptides. Results were confirmed in an independent set of biopsies collected from three additional individuals. Comparative analysis against data from post-mortem samples showed enhanced quantitative power and confidence level in samples collected from living hearts. Our analysis, combined with data from genome wide association studies suggested candidate gene associations to MVP, identified higher abundance in ventricle for proteins associated with cardiomyopathies and revealed the dilated LA proteome, demonstrating differential representation of molecules previously associated with AF, in non-AF hearts.This is the largest dataset of cardiac protein expression from human samples collected in vivo. It provides a comprehensive resource that allows insight into molecular fingerprints of MVP and facilitates novel inferences between genomic data and disease mechanisms. We propose that over-representation of proteins in ventricle is consequent not to redundancy but to functional need, and conclude that changes in abundance of proteins known to associate with AF are not sufficient for arrhythmogenesis.
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Stachowski, Marek. "Terminy „sufiks” i „końcówka” w polskiej terminologii gramatycznej." LingVaria 13, no. 26 (November 16, 2018): 277–86. http://dx.doi.org/10.12797/lv.13.2018.26.18.
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The Terms “Suffix” and “Desinence” among Polish Grammatical TermsThe Polish grammatical tradition seems unique in that the strict limiting of the use of the term “desinence, ending” to inflection and that of “suffix” to word formation is observed. This author arguesagainst an obligatory status of that differentiation. His opinion is that both terms should interchangeablybe used because a special term for an inflectional suffix (= “ending”) generally only produces redundant syntagms as is, for instance, the case with “genitive ending” = “inflectional genitive suffix”. A special problem concerns the English suffix -ing that forms both inflectional forms (a beating boy) and gerunds (beating a boy) and cannot actually be classified as either “suffix” or “desinence” (the fact that the term “gerund” is used for both functions in modern grammars does not eliminate the distinctness of the functions).
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Wood, D. C., S. Ashraf, M. Bisulli, S. Wang, A. Modena, R. Larkin, S. Shah, et al. "P03.11: The role of the redundant septum primum in RV greater than LV disproportion." Ultrasound in Obstetrics & Gynecology 34, S1 (September 2009): 189. http://dx.doi.org/10.1002/uog.7052.
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Ishikawa, Kiyotake, Elie R. Chemaly, Lisa Tilemann, Kenneth Fish, Dennis Ladage, Jaime Aguero, Torsten Vahl, Carlos Santos-Gallego, Yoshiaki Kawase, and Roger J. Hajjar. "Assessing left ventricular systolic dysfunction after myocardial infarction: are ejection fraction and dP/dtmax complementary or redundant?" American Journal of Physiology-Heart and Circulatory Physiology 302, no. 7 (April 1, 2012): H1423—H1428. http://dx.doi.org/10.1152/ajpheart.01211.2011.
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Among the various cardiac contractility parameters, left ventricular (LV) ejection fraction (EF) and maximum dP/d t (dP/d tmax) are the simplest and most used. However, these parameters are often reported together, and it is not clear if they are complementary or redundant. We sought to compare the discriminative value of EF and dP/d tmax in assessing systolic dysfunction after myocardial infarction (MI) in swine. A total of 220 measurements were obtained. All measurements included LV volumes and EF analysis by left ventriculography, invasive ventricular pressure tracings, and echocardiography. Baseline measurements were performed in 132 pigs, and 88 measurements were obtained at different time points after MI creation. Receiver operator characteristic (ROC) curves to distinguish the presence or absence of an MI revealed a good predictive value for EF [area under the curve (AUC): 0.998] but not by dP/d tmax (AUC: 0.69, P < 0.001 vs. EF). Dividing dP/d tmax by LV end-diastolic pressure and heart rate (HR) significantly increased the AUC to 0.87 ( P < 0.001 vs. dP/d tmax and P < 0.001 vs. EF). In naïve pigs, the coefficient of variation of dP/d tmax was twice than that of EF (22.5% vs. 9.5%, respectively). Furthermore, in n = 19 pigs, dP/d tmax increased after MI. However, echocardiographic strain analysis of 23 pigs with EF ranging only from 36% to 40% after MI revealed significant correlations between dP/d tmax and strain parameters in the noninfarcted area (circumferential strain: r = 0.42, P = 0.05; radial strain: r = 0.71, P < 0.001). In conclusion, EF is a more accurate measure of systolic dysfunction than dP/d tmax in a swine model of MI. Despite the variability of dP/d tmax both in naïve pigs and after MI, it may sensitively reflect the small changes of myocardial contractility.
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Petridis, Stefanos, Orestis Blanas, Dimitrios Rakopoulos, Fotis Stergiopoulos, Nikos Nikolopoulos, and Spyros Voutetakis. "An Efficient Backward/Forward Sweep Algorithm for Power Flow Analysis through a Novel Tree-Like Structure for Unbalanced Distribution Networks." Energies 14, no. 4 (February 9, 2021): 897. http://dx.doi.org/10.3390/en14040897.
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The increase of distributed energy resources (DERs) in low voltage (LV) distribution networks requires the ability to perform an accurate power flow analysis (PFA) in unbalanced systems. The characteristics of a well performing power flow algorithm are the production of accurate results, robustness and quick convergence. The current study proposes an improvement to an already used backward-forward sweep (BFS) power flow algorithm for unbalanced three-phase distribution networks. The proposed power flow algorithm can be implemented in large systems producing accurate results in a small amount of time using as little computational resources as possible. In this version of the algorithm, the network is represented in a tree-like structure, instead of an incidence matrix, avoiding the use of redundant computations and the storing of unnecessary data. An implementation of the method was developed in Python programming language and tested for 3 IEEE feeder test cases (the 4 bus feeder, the 13 bus feeder and the European Low Voltage test feeder), ranging from a low (4) to a very high (907) buses number, while including a wide variety of components witnessed in LV distribution networks.
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Lai, Joon-Keat, and Wen-Shin Lin. "Real-Time Detection of Rice Growth Phase Transition for Panicle Nitrogen Application Timing Assessment." Agronomy 11, no. 12 (December 3, 2021): 2465. http://dx.doi.org/10.3390/agronomy11122465.
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Nitrogen (N) topdressing at the early reproductive phase (ER) is beneficial for rice yield. However, the ER overlaps with the late vegetative phase (LV) and is, thus, difficult to be recognized by human observation. Therefore, this study aimed to establish a high-temporal-resolution approach to determine the LV and ER via hyperspectral proximal sensing. Firstly, this research measured the leaf cover area (LCA), leaf dry weight (LDW), chlorophyll content (SPAD), leaf N content (LNC), and leaf N accumulation (LNA) to investigate the physical and physiological changes of the rice plant during growth phase transition. It could be summarized that the LCA would be maximally extended before ER, the leaf growth would be retarded after LV, and leaves turned from green to yellowish-green resulting from N translocation. These phenomena were expected to be detected by the hyperspectral sensor. In order to capture the variation of spectral information while eliminating redundant hyperspectral wavelengths, feature extraction (FE) and feature selection (FS) were conducted to reduce the data dimension. Meanwhile, the implications of the features were also inferenced. Three principal components, which correlated with the rice plant’s physical and physiological traits, were extracted for subsequent modeling. On the aspect of FS, 402, 432, 579, and 696 nm were selected as the predictors. The 402 nm wavelength significantly correlated with leaf cover area to some extent (p < 0.09), and 432 nm had no significant correlation with all of the measured plant traits (p > 0.10). The 579 nm and 696 nm wavelengths were negatively correlated with SPAD and LNC (p < 0.001). In addition, 696 nm was also negatively correlated with LNA (p < 0.05). Finally, the logistic regression, random forest (RF), and support vector machine (SVM) algorithms were adopted to solve the binary classification problem. The result showed that the feature extraction-based logistic regression (FE-logistic) and support vector machine (FE-SVM) were competent for growth phase discrimination (accuracy > 0.80). Nonetheless, taking the detrimental effects of applying N at LV into consideration, the feature extraction-based support vector machine (FE-SVM) was more appropriate for the timing assessment of panicle fertilizer application (sensitivity > 0.90; specificity > 0.80; precision > 0.80).
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Bellis, Alessandro, Ciro Mauro, Emanuele Barbato, Giuseppe Di Gioia, Daniela Sorriento, Bruno Trimarco, and Carmine Morisco. "The Rationale of Neprilysin Inhibition in Prevention of Myocardial Ischemia-Reperfusion Injury during ST-Elevation Myocardial Infarction." Cells 9, no. 9 (September 21, 2020): 2134. http://dx.doi.org/10.3390/cells9092134.
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During the last three decades, timely myocardial reperfusion using either thrombolytic therapy or primary percutaneous intervention (pPCI) has allowed amazing improvements in outcomes with a more than halving in 1-year ST-elevation myocardial infarction (STEMI) mortality. However, mortality and left ventricle (LV) remodeling remain substantial in these patients. As such, novel therapeutic interventions are required to reduce myocardial infarction size, preserve LV systolic function, and improve survival in reperfused-STEMI patients. Myocardial ischemia-reperfusion injury (MIRI) prevention represents the main goal to reach in order to reduce STEMI mortality. There is currently no effective therapy for MIRI prevention in STEMI patients. A significant reason for the weak and inconsistent results obtained in this field may be the presence of multiple, partially redundant, mechanisms of cell death during ischemia-reperfusion, whose relative importance may depend on the conditions. Therefore, it is always more recognized that it is important to consider a “multi-targeted cardioprotective therapy”, defined as an additive or synergistic cardioprotective agents or interventions directed to distinct targets with different timing of application (before, during, or after pPCI). Given that some neprilysin (NEP) substrates (natriuretic peptides, angiotensin II, bradykinin, apelins, substance P, and adrenomedullin) exert a cardioprotective effect against ischemia-reperfusion injury, it is conceivable that antagonism of proteolytic activity by this enzyme may be considered in a multi-targeted strategy for MIRI prevention. In this review, by starting from main pathophysiological mechanisms promoting MIRI, we discuss cardioprotective effects of NEP substrates and the potential benefit of NEP pharmacological inhibition in MIRI prevention.
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Kelley, Brian P., Abdul Mateen Chaudry, and Faisal F. Syed. "Developing a Mechanistic Approach to Sudden Death Prevention in Mitral Valve Prolapse." Journal of Clinical Medicine 11, no. 5 (February 26, 2022): 1285. http://dx.doi.org/10.3390/jcm11051285.
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Sudden cardiac death (SCD) from ventricular fibrillation (VF) can occur in mitral valve prolapse (MVP) in the absence of other comorbidities including mitral regurgitation, heart failure or coronary disease. Although only a small proportion with MVP are at risk, it can affect young, otherwise healthy adults, most commonly premenopausal women, often as the first presentation of MVP. In this review, we discuss arrhythmic mechanisms in MVP and mechanistic approaches for sudden death risk assessment and prevention. We define arrhythmogenic or arrhythmic MVP (AMVP) as MVP associated with complex and frequent ventricular ectopy, and malignant MVP (MMVP) as MVP with high risk of SCD. Factors predisposing to AMVP are myxomatous, bileaflet MVP and mitral annular disjunction (MAD). Data from autopsy, cardiac imaging and electrophysiological studies suggest that ectopy in AMVP is due to inflammation, fibrosis and scarring within the left ventricular (LV) base, LV papillary muscles and Purkinje tissue. Postulated mechanisms include repetitive injury to these regions from systolic papillary muscle stretch and abrupt mitral annular dysmotility (excursion and curling) and diastolic endocardial interaction of redundant mitral leaflets and chordae. Whereas AMVP is seen relatively commonly (up to 30%) in those with MVP, MVP-related SCD is rare (2–4%). However, the proportion at risk (i.e., with MMVP) is unknown. The clustering of cardiac morphological and electrophysiological characteristics similar to AMVP in otherwise idiopathic SCD suggests that MMVP arises when specific arrhythmia modulators allow for VF initiation and perpetuation through action potential prolongation, repolarization heterogeneity and Purkinje triggering. Adequately powered prospective studies are needed to assess strategies for identifying MMVP and the primary prevention of SCD, including ICD implantation, sympathetic modulation and early surgical mitral valve repair. Given the low event rate, a collaborative multicenter approach is essential.
Dissertations / Theses on the topic "LV redundancy"
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Kazim, Muhammad Anser. "Designing Smart Electrical Panels for Existing Wastewater Treatment Plants to Achieve Optimised Biogas Production and Cogeneration with HV/LV and Communication Redundancy for Smart Grid." Thesis, 2018. https://vuir.vu.edu.au/37856/.
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Recognising the deep potential in wastewater treatment plant (WWTP) automation strategies, this research focuses on expanding the plant operations in order to optimally utilise the produced biogas during the wastewater treatment process to achieve electricity cogeneration and High Voltage/Low Voltage (HV/LV) redundancy. The research has resulted in a proposed design for a smart Remote Terminal Unit (RTU). The proposed design also enables a failsafe mechanism at different levels of the water treatment process and biogas production thus facilitating an automated WWTP electricity cogeneration. The proposed design also increases the life span of substations, reduces power demand load on the grids and enhances safety of WWTP equipment during various scenarios of electricity cogeneration, shut downs and maintenance operations. Monitoring, operating and controlling of WWTPs is a complex and challenging task. The power equipment in most of the existing or old WWTPs that generates electricity from the biogas produced in the water treatment process requires intensive supervision and control to enable failsafe and redundant electricity cogeneration process. This research focuses on setting up an effective communication system between power equipment at existing or older WWTP distribution substations and power company`s zone substations, without the need to upgrade expensive switchgear and power equipment in the network. The proposed philosophy achieves automated and failsafe communication network for SCADA link to enable WWTP electricity cogeneration, utilising exiting or old infrastructure. This critical multidirectional power and data flow requires proper compliant and semantic data models to guarantee smooth and safe operations. It also requires to be flexible and have the ability to develop and implement the telemetric mapping philosophy between the substations during various scenarios of electricity cogeneration and faults. This research has resulted in a proposal of smart Remote Terminal Units (RTUs) on existing or old infrastructure of WWTP to achieve electricity cogeneration with integrated renewable energy resource