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Academic literature on the topic 'VFOA'

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Published: 11 September 2023

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Journal articles on the topic "VFOA"

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Liu, Yuanyuan, Xingmei Li, Fang Fang, Fayong Zhang, Jingying Chen, and Zhizhong Zeng. "Visual Focus of Attention and Spontaneous Smile Recognition Based on Continuous Head Pose Estimation by Cascaded Multi-Task Learning." International Journal of Pattern Recognition and Artificial Intelligence 33, no. 07 (June 7, 2019): 1940006. http://dx.doi.org/10.1142/s0218001419400068.

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Multi-person Visual focus of attention (M-VFOA) and spontaneous smile (SS) recognition are important for persons’ behavior understanding and analysis in class. Recently, promising results have been reported using special hardware in constrained environment. However, M-VFOA and SS remain challenging problems in natural and crowd classroom environment, e.g. various poses, occlusion, expressions, illumination and poor image quality, etc. In this study, a robust and un-invasive M-VFOA and SS recognition system has been developed based on continuous head pose estimation in the natural classroom. A novel cascaded multi-task Hough forest (CM-HF) combined with weighted Hough voting and multi-task learning is proposed for continuous head pose estimation, tip of the nose location and SS recognition, which improves accuracies of recognition and reduces the training time. Then, M-VFOA can be recognized based on estimated head poses, environmental cues and prior states in the natural classroom. Meanwhile, SS is classified using CM-HF with local cascaded mouth-eyes areas normalized by the estimated head poses. The method is rigorously evaluated for continuous head pose estimation, multi-person VFOA recognition, and SS recognition on some public available datasets and real-class video sequences. Experimental results show that our method reduces training time greatly and outperforms the state-of-the-art methods for both performance and robustness with an average accuracy of 83.5% on head pose estimation, 67.8% on M-VFOA recognition and 97.1% on SS recognition in challenging environments.
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Huang, Huajuan, Dao Tao, Xiuxi Wei, and Yongquan Zhou. "Adaptive Image Enhancement Algorithm Based on Variable Step Fruit Fly Optimization Algorithm and Nonlinear Beta Transform." Biomimetics 8, no. 2 (May 22, 2023): 212. http://dx.doi.org/10.3390/biomimetics8020212.

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Due to the traditional use of manual methods for the parameter adjustment of a nonlinear beta transform, which is inefficient and unstable, an adaptive image enhancement algorithm based on a variable step size fruit fly optimization algorithm and a nonlinear beta transform is proposed. Utilizing the intelligent optimization characteristics of the fruit fly algorithm, we automatically optimize the adjustment parameters of a nonlinear beta transform to achieve better image enhancement effects. Firstly, the dynamic step size mechanism is introduced into the fruit fly optimization algorithm (FOA) to obtain a variable step size fruit fly optimization algorithm (VFOA). Then, with the adjustment parameters of the nonlinear beta transform as the optimization object, and the gray variance of the image as the fitness function, an adaptive image enhancement algorithm (VFOA-Beta) is obtained by combining the improved fruit fly optimization algorithm with the nonlinear beta function. Finally, nine sets of photos were used to test the VFOA-Beta algorithm, while seven other algorithms were used for comparative experiments. The test results show that the VFOA-Beta algorithm can significantly enhance images and achieve better visual effects, which has a certain practical application value.
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Indi, Chirag S., Varun Pritham, Vasundhara Acharya, and Krishna Prakasha. "Detection of Malpractice in E-exams by Head Pose and Gaze Estimation." International Journal of Emerging Technologies in Learning (iJET) 16, no. 08 (April 23, 2021): 47. http://dx.doi.org/10.3991/ijet.v16i08.15995.

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Examination malpractice is a deliberate wrong doing contrary to official examina-tion rules designed to place a candidate at unfair advantage or disadvantage. The proposed system depicts a new use of technology to identify malpractice in E-Exams which is essential due to growth of online education. The current solu-tions for such a problem either require complete manual labor or have various vulnerabilities that can be exploited by an examinee. The proposed application en-compasses an end-to-end system that assists an examiner/evaluator in deciding whether a student passes an online exam without any probable attempts of mal-practice or cheating in e-exams with the help of visual aids. The system works by categorizing the student’s VFOA (visual focus of attention) data by capturing the head pose estimates and eye gaze estimates using state-of-the-art machine learn-ing techniques. The system only requires the student (test-taker) to have a func-tioning internet connection along with a webcam to transmit the feed. The exam-iner is alerted when the student wavers in his VFOA, from the screen greater than X, a predefined threshold of times. If this threshold X is crossed, the appli-cation will save the data of the person when his VFOA is off the screen and send it to the examiner to be manually checked and marked whether the action per-formed by the student was an attempt at malpractice or just momentary lapse in concentration. The system use a hybrid classifier approach where two different classifiers are used, one when gaze values are being read successfully (which may fail due to various reasons like transmission quality or glare from his specta-cles), the model falls back to the default classifier which only reads the head pose values to classify the attention metric, which is used to map the student’s VFOA to check the likelihood of malpractice. The model has achieved an accuracy of 96.04 percent in classifying the attention metric.
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Vosper, J. V. "Maximum oscillation frequencies andftsensitivities of two groups of single-VFOA active-RC oscillators." International Journal of Electronics 88, no. 7 (July 2001): 759–72. http://dx.doi.org/10.1080/00207210110052874.

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Wentz, Laurel M., P. S. Webb, and Kate Burks. "A Comprehensive Method of Assessing Body Composition Using Kinanthropometry in Human Performance Training." Journal of Special Operations Medicine 22, no. 2 (2022): 37. http://dx.doi.org/10.55460/vfoy-zeg6.

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Munro, Erin, and Nancy Kopell. "Subthreshold somatic voltage in neocortical pyramidal cells can control whether spikes propagate from the axonal plexus to axon terminals: a model study." Journal of Neurophysiology 107, no. 10 (May 15, 2012): 2833–52. http://dx.doi.org/10.1152/jn.00709.2011.

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There is suggestive evidence that pyramidal cell axons in neocortex may be coupled by gap junctions into an “axonal plexus” capable of generating very fast oscillations (VFOs) with frequencies exceeding 80 Hz. It is not obvious, however, how a pyramidal cell in such a network could control its output when action potentials are free to propagate from the axons of other pyramidal cells into its own axon. We address this problem by means of simulations based on three-dimensional reconstructions of pyramidal cells from rat somatosensory cortex. We show that somatic depolarization enables propagation via gap junctions into the initial segment and main axon, while somatic hyperpolarization disables it. We show further that somatic voltage cannot effectively control action potential propagation through gap junctions on minor collaterals; action potentials may therefore propagate freely from such collaterals regardless of somatic voltage. In previous work, VFOs are all but abolished during the hyperpolarization phase of slow oscillations induced by anesthesia in vivo. This finding constrains the density of gap junctions on collaterals in our model and suggests that axonal sprouting due to cortical lesions may result in abnormally high gap junction density on collaterals, leading in turn to excessive VFO activity and hence to epilepsy via kindling.
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Andrade, Maureen S. "International Student Persistence: Integration or Cultural Integrity?" Journal of College Student Retention: Research, Theory & Practice 8, no. 1 (May 2006): 57–81. http://dx.doi.org/10.2190/9my5-256h-vfva-8r8p.

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Bernstein, Zale P., Stephen P. Brooks, Asher Chanan-Khan, Sandra O. Gollnick, Mark J. Gilbert, Kena C. Miller, and Thomas B. Tomasi. "Granulocyte-macrophage colony-stimulating factor (GM-CSF) restores allostimulatory function to accessory cells in patients with AIDS." HIV Clinical Trials 3, no. 3 (May 2002): 219–24. http://dx.doi.org/10.1310/hp8b-nf27-vfwa-80yx.

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Buttigieg, Christopher P., and Gerd Sapiano. "A critical examination of the VFA framework – the VFA agent and beyond." Law and Financial Markets Review 14, no. 1 (July 12, 2019): 48–58. http://dx.doi.org/10.1080/17521440.2019.1640421.

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Hanajima, Ritsuko, Robert Chen, Peter Ashby, Andres M. Lozano, William D. Hutchison, Karen D. Davis, and Jonathan O. Dostrovsky. "Very Fast Oscillations Evoked by Median Nerve Stimulation in the Human Thalamus and Subthalamic Nucleus." Journal of Neurophysiology 92, no. 6 (December 2004): 3171–82. http://dx.doi.org/10.1152/jn.00363.2004.

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Very fast oscillations (VFOs; 500–1,500 Hz) are associated with sensory-evoked potentials (SEPs), but their origin is unknown. To characterize the origins of VFOs, we studied 35 patients with deep brain stimulation (DBS) electrodes [15 with thalamic and 20 with the subthalamic nucleus (STN) electrodes]. We recorded median nerve stimulation–evoked SEPs from the thalamus and STN with microelectrodes during stereotactic surgery and from the contacts of the DBS electrodes postoperatively. We also examined the firing of individual neurons in thalamus in relation to the VFOs. In the thalamus, VFOs with frequencies around 1,000 Hz were superimposed on slow potentials. Both slow and fast SEP components showed phase reversals in the somatosensory thalamus [ventralis caudalis (Vc)]. Median nerve poststimulus time histograms showed that single thalamic neurons fired at preferred times at intervals between 0.8 to 1.2 ms that were synchronous with the VFOs, although the neurons fired only once or a few times per trial. In the STN, low-amplitude SEPs with VFOs were observed at a latency similar to the thalamic SEPs. The VFOs from STN probably represent volume conduction, possibly from the medial lemniscus. We conclude that the thalamic VFOs are generated within Vc and that they induce time-locked firing in a network of neurons.
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Dissertations / Theses on the topic "VFOA"

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Sundin, Anton. "Produktion av bioplast i Värmland? : Fermentering av olika avfallströmmar." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-36624.

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Ett av världens största miljöproblem är plastnedskräpning. På många platser kan spår av mänsklig närvaro ses i form av skräp av plast. År 2011 tillverkades det 280 miljoner ton plast, det motsvarar ungefär 28 000 Eiffeltorn. I Sverige förbrukades år 2010 ungefär 880 000 ton plast. I Asien produceras ungefär 50 % av all världens plast och Kina står för cirka hälften av detta. Nordamerika och Europa står för cirka 40 % av världens plastproduktion. Resterande produktion av plast är fördelat på Afrika och Sydamerika. Kommersiell plast är uppbyggd av små enheter kallade polymerer. Polymerer är i sin tur uppbyggda av ännu mindre enheter som kallas monomerer. Dessa monomerer är i dagsläget framställda av petroleum (råolja/mineralolja). Ungefär 4 % av världens oljekonsumtion går åt som råvara till att producera plast och lika mycket olja används som bränsle i tillverkningsprocessen. Begreppet bioplast är en hel familj av material som är biologiskt nedbrytbar, biobaserade eller bådadera. Det är dock inte en självklarhet att bioplaster besitter båda egenskaperna. PHA-plast är biobaserad och biologisk nedbrytbar, vilket är anledningen till att den står i fokus under detta examensarbete. För produktion av PHA-plast används en trestegsprocess, vilket innefattar ett fermenteringssteg, ett selektionssteg och ett ackumuleringssteg. Sist sker en extraktion för att frigöra PHA- plasten från det övriga organiska materialet. Syftet med det här examensarbetet är att med hjälp av framställning av bioplast främja miljön, vilket en anläggning som producerar bioplast skulle göra eftersom en del av den fossiloljebaserade plasten skulle kunna bytas ut mot bioplasten PHA. Större framställningsmöjligheter av bioplast i Värmland skulle medföra ett ökat intresse av en produktionsanläggning. Målet är att inventera olika industrier runt om i Värmland, i första hand matindustrier och skogsindustrier, och utreda deras processavloppsvattens potential att producera VFA. I detta examensarbete har fermenteringsförsök genomförts satsvis på processavloppsvatten från OLW, Barilla (Wasa), Skoghall, Gruvön och Rottneros. Försöken visar deras potential att producera VFA. Experimenten utfördes med ett konstant pH på 6 och varierande uppehållstid. Resultaten visade att OLW och Barilla har bäst potential till VFA-produktion med 4500 mg/l respektive 1610 mg/l. Spädning av OLWs och Barillas processavloppsvatten visade sig vara en gynnsam åtgärd, då VFA-produktionen ökade snabbare i jämförelse med de tester som utfördes vid icke-spädning. Dock erhölls inte lika stor totalmängd av VFA. Det är dock bättre att producera en större mängd VFA och på så vis låta processen ta längre tid. Vid fortsatta experiment rekommenderas att göra ytterligare försök på OLW och Barillas processavloppsvatten då de visade bäst potential till VFA-produktion.
One of the biggest environmental problems is the plastic littering. In many places traces of human presence is seen in the form of plastic littering. In the year 2011, 280 million tons of plastic was produced, which represents about 28 000 Eiffel Towers. In Sweden, about 880 000 tons of plastic a year is consumed, according to figures from 2010. Approximately 50 % of all the world's plastics are produced In Asia and China accounts for about half of it. North America and Europe account for about 40% of the world's plastic production. The remaining production is distributed between Africa and South America. Commercial plastic is made from small units called polymers. A polymer consists of smaller units called monomers. In present, these monomers are produced out of petroleum (crude oil/ mineral oil). Approximately 4% of the world’s oil consumption is spent as raw material to produce plastic and the same amount of oil is used as fuel in the plastic production process. The term bio-plastic is used for a family of materials which are biodegradable, bio- based or both. However, it is not given that bioplastics do possess both properties. PHA plastics are both bio based and biodegradable, which is why it is the focus for this thesis. Production of PHA plastic is a three-step process comprising a fermentation step, a selection step, and an accumulation stage. Finally, there is an extraction to release the PHA plastic from the organic material. The aim of this thesis is to aid the production of bioplastics in order to lessen the environmental load of plastics. The more bioplastic that can be produced, the greater the interest of a bioplastic-producing plant in Värmland. The goal is to make an inventory of industries around Värmland, primarily food industries and forest industries, and to quantify the potential of their process wastewaters to produce VFA. In this thesis, fermentation experiments conducted batch-wise was performed with process wastewater from OLW, Barilla (Wasa), Skoghall, Gruvön and Rottneros. The experiments showed the wastewaters potential to produce VFA. The experiments were performed with a constant pH of 6 and with varying residence time. The results showed that OLW and Barilla has the highest potential for VFA production with 4500 mg/l and 1610 mg/l, respectively. Dilution of OLWs and Barillas process water turned out to be favorable, as the VFA production increased rapidly in comparison with those tests that were conducted under non-dilution. The total production of VFA, however, was not as high. In further experiments, it is recommended to make another attempt at the OLWs and Barillas process wastewater since they showed the best potential for VFA production.
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Wogatai, Ulrika. "Förekomst av hyperopi bland hjälpsökande på en VFA-resa i Bolivia." Thesis, Linnaeus University, School of Natural Sciences, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-6076.

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Syfte: Att undersöka förekomst av hyperopi i förhållande till läskunnighet hos hjälpsökande hos VFA i Bolivia, samt jämföra med studier från andra delar av världen.

Metod: Studien utfördes i april 2010 på tre olika orter i centrala Bolivia. Patienterna sökte själva upp platsen för att få en undersökning. Subjektiv refraktion utfördes binokulärt, utan dimning, med hjälp av provbåge, provlåda och syntavla med Snellen E, uppsatt på 5 meters avstånd. Hyperopi räknades som sfärisk ekvivalent ≥ +1,00 D, myopi som ≤ –0,25 DS.

Resultat: 1 313 personer undersöktes, varav 1 271, mellan 6 och 92 år gamla, ingick i studien. Förekomsten av hyperopi var totalt 23,8% (som mest 39,8% hos kvinnor 66-92 år gamla, och som minst 10,7% hos kvinnor 6-19 år gamla), läskunnighet totalt var 81,7% (kvinnor 74,7%, män 90,7%). Det var något lägre läskunnighet bland hyperoper (78,1%) än bland myoper (83,2%) och emmetroper (82,7%).

Slutsats: Bolivia verkar ha större förekomst av hyperopi än Asien och Europa. Hyperopi ökar med åldern, främst efter 50-årsåldern. Miljöfaktorn ser ut att ha viss betydelse.

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Restrepo, P. Ricardo J. "Dry matter digestibility and VFA production of selected feedstuffs using RUSITEC /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9901273.

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Noohi, Joobani Ali <1987&gt. "“VFA production from urban waste through acidogenic fermentation process: a machine learning approach”." Master's Degree Thesis, Università Ca' Foscari Venezia, 2022. http://hdl.handle.net/10579/21632.

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Optimization of the dark fermentation process for the recovery of volatile fatty acids (VFA). The work is divided into pilot-scale fermentation tests on mixtures of sewage sludge and food residues, investigating different process parameters that influence fermentation yields. A machine learning approach will be used for data management and the development of a model that will be able to correlate the process performance (s) on the basis of different inputs (operational parameters).
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Lee, Sung Jae. "Relationship between Oxidation Reduction Potential (ORP) and Volatile Fatty Acid (VFA) Production in the Acid-Phase Anaerobic Digestion Process." Thesis, University of Canterbury. Civil and Natural Resources Engineering, 2008. http://hdl.handle.net/10092/1262.

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The purpose of this research was to investigate the relationship between the oxidation-reduction potential (ORP) measurement and volatile fatty acid (VFA) production in the acid-phase anaerobic digestion process under different conditions of temperature and residence time. Two identical anaerobic digesters were operated while VFAs, SCOD, VSS, alkalinity, ORP and pH were measured. In digester 1, VFA production of 5,556 mg/L was generated with an ORP of -315 mv at a 10 day SRT; while 5,400 mg/L of VFA with an ORP of -389 mv was recorded in digester 2. The SRT was adjusted at 5, 8, 10, 12 and 15 days and the optimum SRT was 10 days in both digesters. The results of this study indicate there were no tight relationship between VFA production and ORP values, thus ORP by itself is not a good predictor of the amount of VFAs generated. However, ORP combined with temperature had good linear relationship with VFA production. An ORP range of -315 to -390 mv was desirable for maximizing VFA production in both anaerobic digesters. Different temperatures (14, 29 and 37 ℃) were trialed and the results indicate that the conditions at 29 ℃ and 37 ℃ were not significantly different in terms of VFA production, however, less VFAs were generated at the lowest temperature of 14 ℃.
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Häll, Sebastian, and Jani Körkkö. "Reducering av PIA och ledtider via VFA med upprätthållen leveranssäkerhet: en SME fallstudie inom tillverkningsindustrin." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-43723.

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Bakgrund: Små-medelstora-företag (SME) har en viktig roll i dagens samhälle. SMEs står idag för en stor del av arbetsgivarsegmentet samt för en stor del av den ekonomiska utveckling som sker i Europa. Inom tillverkningsindustrin är en av utmaningarna att säkerställa robusta processer med hög kvalitet. För SMEs innebär det kontinuerlig uppföljning av de interna samt externa processerna för att hela tiden försäkra sig om att verksamheten följer uppsatta ramar, vilket generellt kan vara svårt eftersom tillgängliga resurser är begränsade. Andra utmaningar som tillverkande företag står inför är långa ledtider, högt antal produkter i arbete (PIA), lagerbildningar mellan processer och kassationer. En av de viktigaste egenskaperna för tillverkande SMEs konkurranskraftighet är företagets förmåga att leverera i tid.   Syfte: Syftet är att undersöka leveranssäkerheten i ett SME inom tillverkningsindustrin, med tillhörande frågeställning: Hur kan Lean-verktyg appliceras för att minimera PIA och ledtider samt bibehålla hög leveranssäkerhet?   Ansats: För att undersöka leveranssäkerheten i ett SME inom tillverkningsindustrin valdes ett företag med flera produktionsanläggningar och globala kunder med höga krav att leverera i tid till kunden. Värdeflödesanalys (VFA) tillämpades för att utforska hur produktionssystemet i företaget presterade, ge insikt till hur företaget arbetar med leveranssäkerhet och om leveranssäkerheten kan ökas genom implementering av identifierade förbättringsmöjligheter. Semistrukturerade intervjuer utfördes för att samla data om hur fallföretaget och dess personal arbetar och säkerhetsställer att produkter levereras i tid. För produktions- och leveransrelaterad data utfördes observationer på en av fallföretagets produktionsanläggningar för en högvolymprodukt. Insamlad data från observationer, dokumentation och intervjuer bearbetades med Lean-verktyg och metoder och jämfördes sedan mot den teoretiska referensramen genom mönsterpassning som analysmetod för att uppnå studiens syfte och ge svar på studiens frågeställning.   Resultat: Genom att analysera fallföretagets produktionssystem har faktorer som kan påverka leveranssäkerheten undersökts med hjälp av VFA och förbättringsområden identifierats. Ett teoretiskt förslag har tagits fram där en balansering av befintligt produktionssystem utförts. I förslaget har både ledtider och PIA reducerats. Genom implementering av det teoretiska förslaget kan fallföretaget uppnå en reducering av PIA och ledtider samt bibehålla sin höga leveranssäkerhet. Vidare skapar det teoretiska förslaget möjligheter för fallföretaget att ha en flexiblare produktion eftersom överskottskapacitet finns i produktionssystemet för produktion av andra produkter.   Originalitet/värde: Studien ger insikt i hur ett SME företag i tillverkningsindustrin arbetar med leveranssäkerhet och hur högre leveranssäkerhet kan erhållas genom applicering av Lean-verktyg.
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malekjahani, seyed. "THE EFFECTS OF PH ON ENHANCED BIOLOGICAL PHOSPHORUS REMOVAL (EBPR) WITH PROPIONIC ACID AS THE DOMINANT VOLATILE FATTY ACID (VFA)." Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3712.

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pH control is a tool to improve some aspects of Enhanced Biological Phosphorus Removal (EBPR) process. Filipe et al (2001a, 2001b, and 2001c) found strong evidence that the stability of EBPR systems can be improved by increasing the pH of the anaerobic zone, thereby creating conditions where phosphorus-accumulating organisms (PAOs) are able to take up acetate faster than glycogen-accumulating organisms (GAOs). They explained this observation by comparing the growth rate of phosphorus-accumulating organisms (PAOs) and glycogen-accumulating organisms (GAOs) and found that pH has little effect on PAOs growth rate but adversely affects GAOs growth rate when it increases (at pH values greater than 7.25, PAOs would take acetate faster than GAOs would). They used synthetic wastewater rich in acetic acid. In this study, we used real wastewater and the dominant volatile fatty acid available to microorganisms was propionic acid in continuous EBPR system. It was found that lower anaerobic zone pH (6.5 vs. 7.2) reduced the anaerobic P release both on an MLVSS specific basis and also on a non-specific (absolute value for the process) basis. In addition, the observed yield was significantly decreased. Aerobic P uptake was lower in the low-pH system (on a non-specific basis) due to the lower observed yield, and thus lower MLVSS concentration. Net P uptake was hard to interpret because of the effect of P release in the secondary clarifier of Train 2 (high pH). However, on a specific basis it was clear that net P uptake was either equal or better in the low-pH system regardless of how the secondary clarifier data was interpreted. Carbon transformations were not impacted in as consistent a fashion as anaerobic P release was. On a specific basis, PHA content remained unchanged although the PHV/PHB ratio was impacted with much lower PHV content in the low-pH system. Glycogen content and the amount of labile glycogen (delta glycogen) were higher in the low-pH system, in spite of the fact that MLVSS P content did not decrease. However, due to the impact of the low observed yield at low pH, absolute values resulted in higher PHA content for the process reactors as a whole, higher glycogen content, and unchanged labile glycogen. Low pH resulted in increased biomass P content, however the lower observed yield offset this on a process basis so that effluent P levels were nearly equal. So low pH improved P removal on a specific basis, but not on a process basis. Since it is unknown if the low observed yield is repeatable, and due to the impact of the secondary clarifier in the high pH system, it cannot be concluded that the effect of low pH on net P removal would be similar in other EBPR systems.
M.S.Env.E.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Environmental Engineering
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Mallory, William, Rich Rivera, William Swinford, and BRB Consulting. "Improving Utilization of F/A-18 Simulator CUBIC Instructors at VFA-106, Naval Air Station Oceana, VA." Thesis, Monterey, California. Naval Postgraduate School, 2010. http://hdl.handle.net/10945/7062.

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EMBA Project Report
EXECUTIVE SUMMARY: Strike Fighter Squadron ONE ZERO SIX (VFA-106), the only East Coast F/A-18 Fleet Replacement Squadron (FRS), has identified problems in Cubic Instructor (CI) capacity during periods of high demand as a result of combining series of aircraft, C/D and E/F, into larger “Super” classes. Subsequently, the squadron is forced to augment CIs with Instructor Pilots (IPs) or Instructor Weapons System Officers (IWSOs) to increase capacity or forego utilization of some of their 70 simulator hours allotted to them daily. A simulator process improvement study was undertaken to help VFA-106 address these issues, ultimately improving production and time-to-train. FINDINGS • The current CI contract is inefficient due to its inflexibility • Simply increasing CI manning is not a long-term solution • The current VFA-106 simulator scheduling construct is insufficient and lacks long-term vision RECOMMENDATIONS • Draft and utilize a more flexible CI contract • Institute simulator scheduling process improvements to provide more continuity and a long-term vision
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Bjarne, Katrin. "Optimerad förfällning med hydrolys och fermentation av primärslam för utvinning av kolkälla till efterdenitrifikation." Thesis, Uppsala universitet, Avdelningen för systemteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-210613.

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Att rena vatten är kostsamt, från både en ekonomisk och miljömässig synpunkt, då behovet av fällningskemikalier, kolkällor och energi är stort. Det är därför önskvärt att titta på alternativa lösningar som möjliggör reningsverk att bli mer självförsörjande och kretsloppsanpassande. Hammarby Sjöstadverket är en pilotanläggning för avloppsvattenrening belägen i Stockholms sydöstra stadsdel i Henriksdal och ägs av IVL, Svenska Miljöinstitutet samt KTH. Sedan pilotanläggning byggdes år 2002, har flera olika reningstekniker utvärderats där fokus ligger på att sträva efter miljövänliga och kretsloppsanpassade system. Bland annat har en förfällningsteknik, så kallad trepunktsfällning utvärderats. Trepunktsfällningen innebär att ett metallsalt följt av två olika polymer tillsätts i flockningskammaren i inbördes ordning för att på så sätt kunna reducera en högre halt av det organiska materialet. Tidigare fällningsförsök på Hammarby Sjöstadsverket, har visat på att trepunktsfällningen kan avskilja det organiska materialet med upp till 90 %, vilket kan jämföras med en avskiljning på endast 75 % med vanlig förfällning. Detta examensarbete syftar till att validera redan framtagna resultat inom trepunktsfällning samt att genom biologisk hydrolys av primärslam, utvinna en kolkälla till efterdenitrifikationen innehållande så höga halter flyktiga fettsyror, Volatile Fatty Acids, (VFA) som möjligt samt undersöka kostnaderna för ett avloppsreningsverk med trepunktsfällning, biogasutvinning och uttag av intern kolkälla från primärslammet vid en uppskalning motsvarande 100 000 personekvivalenter. Fällningsförsöken utfördes i pilotskala med fällningskemikalien PAX XL-36 kombinerat med en lågmolekylär organisk polymer, Purfix-120, följt av en högmolekylär oorganisk polymer Superflock C-494. Syftet med trepunktsfällningen var att validera redan framtagna resultat inom trepunktsfällning och på så sätt avskilja så stora mänger organiskt material som möjligt i förfällningen så att ett primärslam innehållande en hög halt Chemical Oxygen Demand (COD) erhålls. Två olika doseringar med PAX XL-36 testades, 145 respektive 193,5 g/m3. Bäst reduktion av COD och fosfor erhölls då 193 g/m3 PAX XL-36 kombinerades med 60 g/m3 Purfix-120 samt 0,025 g/m3 Superflock C-494. Då erhölls en COD-reduktion på 75 % samt en totalfosforreduktion på 83 %. Genom hydrolys av primärslam i laboratorieskala undersöktes torrsubstanshalter (TS-halter) på 1, 2 respektive 3 % och uppehållstider på upptill åtta dagar. Syftet med hydrolysen var i detta fall att undersöka vilken torrsubstanshalt samt vilken uppehållstid som gav högst produktion av VFA. Försöken visade att en TS-halt på 3 % producerade högst andel VFA och att produktionen av VFA för samtliga TS-halter var som störst under dygn två. VFA- och COD-produktionen ökade linjärt för samtliga TS-halter fram till och med dygn fem. Efter dygn fem började produktionen av VFA och COD för TS-halterna 1 och 2 % avta något. TS 3 % visade dock inte samma avtagande trend för VFA.  Även den dagliga ammoniumhalten och pH undersöktes. Ammoniumhalten ökade i takt med att VFA-halten ökade. pH hade generellt sett en avtagande trend. Fyra olika denitrifikationsförsök genomfördes i laboratorieskala med det uttagna hydrolysatet där den tillsatta COD-halten antingen var 3,3 eller 4 gånger den initiala nitratkvävekoncentrationen. Syftet med denitrifikationsförsöken var att utvärdera det framtagna hydrolysatets funktion som en kolkälla. Denitrifikationsförsöken uppvisade denitrifikationshastigheter mellan 4,3 och 7 mg NO3-N/g volatile suspended solids*h med kol-kvävekvoter (C/N-kvoter) mellan 3,9 och 12,3 mg COD/mg NO3-N. Lägst C/N-kvot erhöll lägst denitrifikationshastighet. Dock kunde inte slutsatsen dras att högst C/N-kvot gav högst denitrifikatioshastighet. Även de ekonomiska aspekterna undersöktes i syfte att utreda kostnaderna för ett avloppsreningsverk med trepunktsfällning, biogasutvinning och uttag av intern kolkälla från primärslammet vid en uppskalning motsvarande 100 000 personekvivalenter. Uttaget av en intern kolkälla skulle trots förlust i biogasutvinning vara ekonomiskt gynnsamt. Vinsten, i form av att ej behöva inhandla en extern kolkälla, i detta fall etanol, motsvarar biogasförlustens belopp. Trepunktsfällningens fällningskemikaliekostnader var den största posten och uppgick till 8 060 000 kr. Denna kostnad kontra mindre energiförbrukning i biosteget undersöktes också. Här uppgick besparingarna i biosteget till ca 1/8 av fällningskemikaliekostnaderna. Då trepunktsfällningen endast kunde ge en 75-procentig COD-reduktion, vilket motsvarar en vanlig förfällning, anses trepunktsfällningen vara ekonomisk ogynnsam då den medför extra kostnader av polymerer.  Istället borde trepunktsfällningen ersättas med en förfällning. Sammanfattningsvis kan det konstateras att en intern kolkälla i form av hydrolyserat primärslam skulle kunna ersätta en extern kolkälla rent funktionsmässigt. Dock måste åtgärder göras för att minimera produktionen av ammonium under slamhydrolysen. Ur ett ekonomiskt perspektiv skulle utvinningen av en intern kolkälla endast vara ekonomisk gynnsam då trepunktsfällningen ersätts med förfällning.
Water treatment is costly, from both an economic and environmental point of view, since the need for precipitation chemicals, carbon sources and energy is high. It is therefore desirable to look for alternative solutions that enable plants to be more self-sustaining. Hammarby Sjöstadsverket is a pilot plant for wastewater treatment located in Henriksdal, a southeastern neighborhood of Stockholm. The plant is owned by IVL, Svenska Miljöinstitutet and Kungliga Tekniska Högskolan (KTH). Since the pilot plant was built in 2002, several different cleaning techniques have been evaluated with focus on striving for eco-friendly and eco-adapted systems. For instance, a pre-precipitation technique, so-called three step precipitation have been evaluated. The three step precipitation implicates that a metal salt followed by two different polymers are added in the flocculation chamber in the particular order to thereby enable to reduce a higher content of the organic material. In previous precipitation tests at Hammarby Sjöstadsverket, one managed to remove up to 90 % of the organic material using the three step precipitation (IVL, Hammarby Sjöstadsverket, 2011). This can be compared to a removal of only 75 % with ordinary pre-precipitation. This thesis aims to validate already obtained results within three step precipitation and with biological hydrolysis of primary sludge, extract a carbon source for post-denitrification containing as high concentrations of Volatile Fatty Acids (VFA) as possible and to investigate the cost of a wastewater treatment plant with three step precipitation, biogas generation and collection of internal carbon source from primary sludge at an upscaling corresponding to 100,000 person equivalents. Precipitation experiments were carried out in pilot scale with the precipitation chemicals, PAX-XL 36, combined with a low molecular weight organic polymer, Purfix-120, followed by a high molecular weight inorganic polymer, Super Flock C-494. The purpose of the three step precipitation was to validate the already produced results within three step precipitation and thus separate as large amounts of organic material as possible in the precipitation so that a primary sludge containing a high chemical oxygen demand (COD) can be obtained.Two different dosages of Purfix-120 were tested: 45 and 60 g/m3. The best reduction of COD and phosphorus were obtained when 193 g/m3 PAX XL-36 was combined with 60 g/m3 Purfix-120 and 0.025 g/m3 Super Flock C-494. Hereby a COD reduction of 75 % and a total phosphorus removal of 83 % were obtained. By hydrolysis of primary sludge in batch experiments Total Solid (TS) concentrations of 1, 2 and 3 % and residence times of up to eight days were examined. The purpose of the hydrolysis in this case was to investigate which TS concentration and residence time that gave the highest production of VFA. The experiments showed that a TS concentration of 3 % produced the highest amount of VFA and that the VFA production of the three different TS concentrations peaked at the second day. The VFA and COD production increased linearly for the three TS concentrations up until day five. After day five the COD and VFA production, for the TS concentrations of 1 and 2 %, started to decrease slightly. However TS 3 % did not show the same declining trend for VFA. Furthermore the daily ammonium and pH were investigated.  As the VFA and COD concentration increased the ammonium concentration increased as well. pH had overall a  decreasing trend. Four different denitrification tests were performed in batch experiments with the extracted hydrolyzate. The added COD content from the hydolyzate was either 3.3 or 4 times the initial nitrate concentration. The denitrification tests showed denitrification rates between 4.3 and 7 mg NO3-N / g volatile suspended solids * h with carbon-nitrogen ratios (C/N ratio) between 3.9 and 12.3 mg COD/mg NO3-N. The lowest C/N ratio received the lowest denitrification rate. However, it could not be concluded that the maximum C/N ratio had the highest denitrification rate. Futhermore the financial aspects were examined in order to investigate the cost of a wastewater treatment plant with three step precipitation, biogas generation and collection of internal carbon source from primary sludge at an upscaling corresponding to 100,000 person equivalents. The extraction of an internal carbon source would, despite loss of biogas production, be economically beneficial. Gain, in terms of not having to purchase an external carbon source, in this case ethanol, amounts to the amount of the biogas loss. The three step precipitation chemical costs were the largest item, amounting to 8,060,000 SEK. This cost versus less energy utilization in the biological step was also examined. In this case the savings in the biological step amounted to about 1/8 of precipitation chemical cost. Since the three step precipitation only managed to remove 75 % of the COD, a removal which corresponds to an ordinary pre-precipitation, the three step precipitation is considered to be economically unfavorable as it involves additional costs of polymers. Instead the three step precipitation should be replaced with a pre-precipitation. In summary it can be stated that an internal carbon source in the form of hydrolyzed primary sludge could replace an external carbon source in a functional way. However, steps must be taken to minimize the production of ammonium during sludge hydrolysis. From an economic perspective, the extraction of an internal carbon source would only be economical favorable if the three step precipitation is replaced with pre-precipitation.
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Drakley, Catherine. "The dietary energy value of wheat for young broiler chickens." Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391650.

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Books on the topic "VFOA"

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New York (State). Dept. of Correctional Services. Division of Program Planning, Research, and Evaluation, ed. Violent crime histories of sample of non-VFO second felony offenders. Albany, N.Y: State of New York, Dept. of Correctional Services, Division of Program Planning, Research and Evaluation, 1985.

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Simbulan, Roland G. Why the Senate should reject the VFA: A briefing paper submitted to the Philippine Senate on the Visiting Forces Agreement. [Quezon City: Nuclear Free Philippines Coalition, 1999.

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Jones, Ally. VFA Chronicles: Dedication. Independently Published, 2021.

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Shapiro, Robert. The Ultimate VFO Book (Explorer Race). Light Technology Publishing, 2002.

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Dictionary of American naval aviation squadrons: Volume 1 The history of VA, VAH, VAK, VAL, VAP, and VFA squadrons. Washington, D.C., USA: Naval Historical Center, Dept. of the Navy : For sale by the U.S. G.P.O., Supt. of Docs., 1995.

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Book chapters on the topic "VFOA"

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Bonnick, Sydney Lou, and Lori Ann Lewis. "VFA Imaging, Femoral Morphometry, and Hip Structural Analysis." In Bone Densitometry for Technologists, 313–40. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-3625-6_13.

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Karyawan, I. Dewa Made Alit, Januarti Jaya Ekaputri, Iswandaru Widyatmoko, and Ervina Ahyudanari. "The Effect of Replacing Natural Aggregate with Geopolymer Artificial Aggregates on Air Voids of Hot Mix Asphalt." In Lecture Notes in Civil Engineering, 455–67. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2532-2_39.

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AbstractHigh voids in hot mix asphalt (HMA) can increase sensitivity to moisture, resulting in premature failure of asphalt pavements. The use of artificial aggregates as a substitute for natural aggregates has been considered in this paper to optimize air voids that meet the requirements. The reason is that natural aggregates are non-renewable raw materials and their availability continues to decrease. This study aims to determine the effect of replacing some natural aggregates with artificial aggregates on air voids. This experiment assessed 2 sets of HMA standard gradations, namely the Bina Marga standard (Indonesian standard) and the Federal Aviation Administration (FAA) standard. For each set, 2 different raw materials are used, namely: 1) asphalt mixture using 100% natural aggregate and 2) asphalt mixture using a combination of 25% artificial aggregate and 75% natural aggregate. The analysis includes volumetric mixes, such as VIM (voids in mix), VMA (voids in mineral aggregates), and VFA (bitumen filled voids). The results of the analysis found that the replacement of natural aggregates with artificial aggregates affected the cavities formed in the asphalt mixture. HMA that uses natural aggregates, shows VMA, VFA and VIM that meet the requirements for pavement surface materials.
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Michałek, Maciej, and Krzysztof R. Kozłowski. "Finite-time VFO Stabilizers for the Unicycle with Constrained Control Input." In Robot Motion and Control 2009, 23–34. London: Springer London, 2009. http://dx.doi.org/10.1007/978-1-84882-985-5_3.

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Michałek, Maciej. "VFO Control for Mobile Vehicles in the Presence of Skid Phenomenon." In Lecture Notes in Control and Information Sciences, 57–66. London: Springer London, 2007. http://dx.doi.org/10.1007/978-1-84628-974-3_5.

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Söğüt, Hasan Can, and Sanem Şener. "İlköğretim Kurumlarında Görev Yapan Öğretmenlerin Vücut Farkındalık Düzeylerinin İş Motivasyonu ve Yaşam Kalitesi Üzerine Etkisi." In Sağlık Bilimleri Alanında Uluslararası Araştırmalar-II. Özgür Yayınları, 2023. http://dx.doi.org/10.58830/ozgur.pub74.c231.

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İstanbul ilinde Nisan-Eylül 2022 tarihleri arasında gerçekleştirilen bu çalışmada, ilköğretimde öğretmenlik yapanların vücut farkındalığı, iş motivasyonu ve yaşam kalitesi arasındaki ilişkiyi araştırmayı amaçlamıştır. Yaş aralığı 25-40 arasında olan 109 gönüllü öğretmen çalışmaya katılmıştır. Çalışmaya dahil edilen öğretmenlerin vücut farkındalığı Vücut Farkındalığı Anketi(VFA) ile, iş motivasyonları İş Motivasyonu Ölçeği(İMÖ) ile, yaşam kaliteleri Nottingham Sağlık Profili (NHP) ile ve postür durumları New York Postür Analizi Yöntemi(NYPAY) ile değerlendirildi. Çalışmada, öğretmenlerin vücut farkındalığı, iş motivasyonu ve yaşam kalitesi ölçekleri online olarak, postür analizi ise gözlem yöntemi ile aynı fizyoterapist tarafından objektif bir şekilde yapıldı. Katılımcıların yaş ortalaması 28,76 ± 5,34 yıl idi. VFA ile içsel motivasyon (p=0,001), VFA ile dışsal motivasyon(p=0,018), VFA ile yaşam kalitesi alt başlıklarından fizikse aktivite(p=0,001), enerji (p=0,024) arasında ve VFA ile NYPAY (p=0,021) arasında anlamlı ve pozitif yönde ilişki bulundu (p<0.05). VFA ile NHP alt başlıklarından ağrı, emosyonel durum, uyku, sosyal izolasyon ile arasında anlamlı bir ilişki bulunamadı. Sonuç olarak; vücut farkındalığı yüksek olan kişilerde iş motivasyonları yüksek, fiziksel aktivite ve enerji düzeyleri yüksek ve postürleri daha iyi bulundu.
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Rowland, Richard. "The Value-First Account and First-Order Neutrality." In The Normative and the Evaluative, 21–37. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198833611.003.0002.

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The Value-First Account (VFA) analyses reasons for pro-attitudes in terms of value. G. E. Moore, amongst others, held VFA. This chapter first motivates and defends a neutrality requirement according to which we have reason to reject views about what it is to have a certain property or to fall under a certain concept that entail the falsity of substantial, widely held, and somewhat plausible first-order views in normative ethics. Two versions of VFA conflict with this neutrality requirement. One version holds that reasons to have pro-attitudes towards something are just valuable features of that thing. This chapter argues that this view conflicts with an important kind of deontology. Another version of VFA analyses reasons for pro-attitudes in terms of the goodness of having those attitudes. The chapter argues that this view conflicts with many views about what things are of value. This chapter then argues that all other versions of VFA fail to provide genuine and non-circular accounts of reasons for pro-attitudes.
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Rowland, Richard. "The Value-First Account and the Unity of the Normative." In The Normative and the Evaluative, 38–54. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198833611.003.0003.

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The Value-First Account (VFA) analyses reasons for pro-attitudes in terms of goodness or value. This chapter makes an argument against VFA. It argues that epistemic reasons for belief should not be analysed in terms of value. But it argues that if epistemic reasons should not be analysed in terms of value but reasons for pro-attitudes should be analysed in terms of value, then epistemic reasons for belief cannot be instances of the very same relation as reasons for pro-attitudes. And this chapter argues that we should hold that epistemic reasons for belief are instances of the very same relation as practical reasons. So, we should reject VFA because it is inconsistent with the way in which epistemic normativity relates to practical normativity.
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Rowland, Richard. "Reasons as The Unity among the Varieties of Goodness." In The Normative and the Evaluative, 76–100. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198833611.003.0005.

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The Buck-Passing Account of Value (BPA) analyses goodness simpliciter in terms of reasons for pro-attitudes. The Value-First Account (VFA) analyses reasons for pro-attitudes in terms of value. And the No-Priority View (NPV) holds that neither reasons nor value can be analysed in terms of one another. This chapter argues that BPA should be accepted rather than VFA or NPV because if BPA is accepted, then what all the different varieties of goodness have in common can be explained: but if VFA or NPV is accepted, what the different varieties of goodness have in common cannot be explained. In making this argument this chapter motivates and defends accounts of goodness for (prudential value) and goodness of a kind (attributive goodness) in terms of reasons for pro-attitudes. It shows that the objections that have been made to buck-passing accounts of goodness for and goodness of a kind can be overcome and that there are many advantages to accepting such accounts.
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Worwag, Małgorzata, and Anna Kwarciak-Kozłowska. "Volatile fatty acid (VFA) yield from sludge anaerobic fermentation through a biotechnological approach." In Industrial and Municipal Sludge, 681–703. Elsevier, 2019. http://dx.doi.org/10.1016/b978-0-12-815907-1.00029-5.

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Bogatko, Alyona, and Vasil Lyasota. "ASSESSMENT OF SAFETY AND FAT QUALITY OF BIRDS ‘CARCASES DURING THEIR PRODUCTION AND STORAGE ACCORDING TO DEVELOPED METHODS." In Priority areas for development of scientific research: domestic and foreign experience. Publishing House “Baltija Publishing”, 2021. http://dx.doi.org/10.30525/978-9934-26-049-0-41.

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The urgency of the work is the need to establish criteria for assessing the safety and quality of poultry meat at facilities for its production and storage, due to the development of new express and improved common methods of controlling the safety and quality of poultry meat for risks (biological, chemical, physical) their life cycle. Studies have assessed the safety and quality of poultry carcasses using new and improved methods for determining the acid and peroxide levels of fat compared to conventional methods for determining the degree of freshness of poultry meat. Organoleptic evaluation of fresh poultry meat was established – for storage in a refrigerated chamber at a temperature of 0−4 °С for 5 days; doubtful degree of freshness – birds for storage in a refrigerator at a temperature of 0−4 °C for 6–7 days; stale – for storage in a refrigerator at a temperature of 0−4 °C for more than 7 days on the appearance of the carcass, color, odor on the surface of the carcass and near the bones, the state of the thoracic cavity, subcutaneous and internal adipose tissue, muscle consistency, broth for cooking samples. There is a high probability of acid number of poultry fat of moderate freshness – 1.76±0.12 mg of NaOH (p≤0.001) and stale fat – 2.83±0.07 mg of NaOH (p≤0.001) compared to the acid number of fresh fat poultry (0.72±0.04 mg NaOH), as well as indicators of volatile fatty acids (VFA) in poultry meat of moderate degree of freshness – 6.62±0.43 mg KOH (p≤0.001) and stale fat – 11.05±0.37 mg KOH (p≤0.001) compared to the content of VFA of fresh poultry meat (2.61±0.24 mg KOH). Studies have established a high reliability of determining the indicators of volatile fatty acids in poultry meat – in 98.2–99.7 % and the results of studies on the indicators of the microscopic method for determining the number of bacteria in poultry meat – in 98.5–99.8 % compared to the acid number as determined by the developed method. The reliability of the indicators for determining the acid number of poultry fat was according to the developed method was 99.9 %. Therefore, the developed method for determining the acid number of poultry fat can be used to determine the quality of poultry meat, because the quality of meat depends on the quality of fat: the acid number of fresh poultry fat – up to 1.0 mg of NaOH; questionable degree of freshness – from 1.1 to 2.5 mg of NaOH; stale – more than 2.5 mg of NaOH. There is a high probability of peroxide content of poultry fat of the appropriate degree of freshness – 0.029 ± 0.002% J (p≤0.001) and stale fat – 0.063±0.003 % J (p≤0.001) compared to the peroxide value of fresh poultry fat (0.010±0.0007 % J), as well as indicators of volatile fatty acids (LFA) in poultry meat of moderate degree of freshness – 6.40±0.48 mg KOH (p≤0.001) and stale fat – 10.43±0.23 mg KOH (p≤0,001) compared to the VFA content of fresh poultry meat (2.58±0.23 mg KOH). The results showed that more reliable data compared to the results of studies for the determination of volatile fatty acids in poultry meat – 98.5–99.7 % and the results of studies on the indicators of the microscopic method for determining the number of bacteria in poultry meat – 99.0–99.6 % were obtained using the developed improved method. The reliability of the indicators for determining the peroxide value of poultry fat according to the developed improved method was 99.9 %. Therefore, the developed improved method for determining the peroxide value of poultry fat can be used to determine the quality of poultry meat, because the quality of meat depends on the quality of fat: peroxide value of fresh poultry fat – up to 0.010 % iodine of questionable degree of freshness – from 0.010 to 0.040 % iodine; stale – more than 0.040% iodine. The developed methods for determining the safety and quality of poultry carcass fat can be used by state veterinary inspectors as simple test methods to carry out appropriate state risk-based control of poultry meat production and storage facilities.
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Conference papers on the topic "VFOA"

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Kumar K, P. "VFSA-PSO Hybrid Algorithm - Resistivity Inversion." In 1st Indian Near Surface Geophysics Conference & Exhibition. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201979037.

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Moreno, David L., and Enrique Fraga. "vFOX: Web Monitoring of Satellite Operations." In 15th International Conference on Space Operations. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-2304.

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Resko, B., and P. Baranyi. "Lateral operations in the VFA model." In 2008 6th International Symposium on Applied Machine Intelligence and Informatics. IEEE, 2008. http://dx.doi.org/10.1109/sami.2008.4469152.

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Kılıç, Onur Selim, Ahmet Akman, and A. Aydın Alatan. "E-VFIA: Event-Based Video Frame Interpolation with Attention." In 2023 IEEE International Conference on Robotics and Automation (ICRA). IEEE, 2023. http://dx.doi.org/10.1109/icra48891.2023.10160276.

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Hassaoui, N., A. Tlemcani, and K. Sebaa. "DPC and VFOC of PWM rectifier using fuzzy type-2." In 2013 3rd International Conference on Systems and Control (ICSC). IEEE, 2013. http://dx.doi.org/10.1109/icosc.2013.6750829.

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Dobróka, M., P. N. Szabó, B. Kiss, and T. Krasznavölgyi. "Petrophysical Interpretation of Well Log Data Using VFSA-I2 Algorithm." In 67th EAGE Conference & Exhibition. European Association of Geoscientists & Engineers, 2005. http://dx.doi.org/10.3997/2214-4609-pdb.1.p215.

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Oliveira, Danian S., Paulo E. M. Cunha, and Milton J. Porsani. "Stack velocity estimation trough a VFSA/Gauss-Newton hibrid algorithm." In 13th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 26-29 August 2013. Society of Exploration Geophysicists and Brazilian Geophysical Society, 2013. http://dx.doi.org/10.1190/sbgf2013-321.

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Wang*, Xiaodan, Xingyao Yin, Baoli Wang, and Fusen Yang. "Pre-stack seismic stochastic inversion with VFSA-based PSO algorithm." In SEG Technical Program Expanded Abstracts 2015. Society of Exploration Geophysicists, 2015. http://dx.doi.org/10.1190/segam2015-5890001.1.

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Agarwal, R., and K. Sain. "Application of VFSA for AVO Inversion of Seismic Reflection Data." In 78th EAGE Conference and Exhibition 2016. Netherlands: EAGE Publications BV, 2016. http://dx.doi.org/10.3997/2214-4609.201601280.

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Akbar, Faruq E., Paul L. Stoffa, Mrinal K. Sen, and Carlos L. Varela. "Automated background velocity estimation in the plane wave domain using VFSA." In SEG Technical Program Expanded Abstracts 1996. Society of Exploration Geophysicists, 1996. http://dx.doi.org/10.1190/1.1826754.

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Reports on the topic "VFOA"

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Brooks, Stephen. FETS-VFFA Cell using Contour-Based Magnets. Office of Scientific and Technical Information (OSTI), February 2020. http://dx.doi.org/10.2172/1895094.

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2

Dahn, Katlin. HF IQ Mixer VFO Temperature Compensation and Drive Level Optimization for Opposite Sideband Suppression. Portland State University Library, December 2019. http://dx.doi.org/10.15760/etd.7304.

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Ellen, Hilko, Yvo Goselink, Jos Huis in ’t Veld, and Albert Winkel. Pilots naar de vermindering van fijnstofemissie uit pluimveestallen: ASPRA Agro van VFA-Solutions/Smits Agro. Wageningen: Wageningen Livestock Research, 2021. http://dx.doi.org/10.18174/548315.

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4

Weinberg, Zwi G., Richard E. Muck, Nathan Gollop, Gilad Ashbell, Paul J. Weimer, and Limin Kung, Jr. effect of lactic acid bacteria silage inoculants on the ruminal ecosystem, fiber digestibility and animal performance. United States Department of Agriculture, September 2003. http://dx.doi.org/10.32747/2003.7587222.bard.

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Abstract:
The overall objective of the whole research was to elucidate the mechanisms by which LAB silage inoculants enhance ruminant performance. The results generated will permit the development of better silage inoculants that maximize both silage preservation and animal performance. For this one-year BARD feasibility study, the objectives were to: 1. determine whether lactic acid bacteria (LAB) used in inoculants for silage can survive in rumen fluid (RF) 2.select the inoculants that survived best, and 3. test whether LAB silage inoculants produce bacteriocins-like substances. The most promising strains will be used in the next steps of the research. Silage inoculants containing LAB are used in order to improve forage preservation efficiency. In addition, silage inoculants enhance animal performance in many cases. This includes improvements in feed intake, liveweight gain and milk production in 25-40% of studies reviewed. The cause for the improvement in animal performance is not clear but appears to be other than direct effect of LAB inoculants on silage fermentation. Results from various studies suggest a possible probiotic effect. Our hypothesis is that specific LAB strains interact with rumen microorganisms which results in enhanced rumen functionality and animal performance. The first step of the research is to determine whether LAB of silage inoculants survive in RF. Silage inoculants (12 in the U.S. and 10 in Israel) were added to clarified and strained RF. Inoculation rate was 10 ⁶ (clarified RF), 10⁷ (strained RF) (in the U.S.) and 10⁷, 10⁸ CFU ml⁻¹ in Israel (strained RF). The inoculated RF was incubated for 72 and 96 h at 39°C, with and without 5 g 1⁻¹ glucose. Changes in pH, LAB numbers and fermentation products were monitored throughout the incubation period. The results indicated that LAB silage inoculants can survive in RF. The inoculants with the highest counts after 72 h incubation in rumen fluid were Lactobacillus plantarum MTD1 and a L. plantarum/P. cerevisiae mixture (USA) and Enterococcus faecium strains and Lactobacillus buchneri (Israel). Incubation of rumen fluid with silage LAB inoculants resulted in higher pH values in most cases as compared with that of un-inoculated controls. The magnitude of the effect varied among inoculants and typically was enhanced with the inoculants that survived best. This might suggest the mode of action of LAB silage inoculants in the rumen as higher pH enhances fibrolytic microorganisms in the rumen. Volatile fatty acid (VFA) concentrations in the inoculated RF tended to be lower than in the control RF after incubation. However, L. plalltarull1 MTDI resulted in the highest concentrations of VFA in the RF relative to other inoculants. The implication of this result is not as yet clear. In previous research by others, feeding silages which were inoculated with this strain consistently enhanced animal performance. These finding were recently published in Weinberg et.al.. (2003), J. of Applied Microbiology 94:1066-1071 and in Weinberg et al.. (2003), Applied Biochemistry and Biotechnology (accepted). In addition, some strains in our studies have shown bacteriocins like activity. These included Pediococcus pentosaceus, Enterococcus faecium and Lactobacillus plantarum Mill 1. These results will enable us to continue the research with the LAB strains that survived best in the rumen fluid and have the highest potential to affect the rumen environment.
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