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Academic literature on the topic 'DBFA'

Author: Grafiati

Published: 3 June 2025

Last updated: 22 June 2025

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Journal articles on the topic "DBFA"

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Gao, Shilun, Yuan Gao, Ying Yang, Liming Jia, and Xuehuang Weng. "Exogenous Sucrose Supply Regulates the Physiological Index Levels Before the Flower Blooming and Fruit Abscission Stages in the Biodiesel Tree Sapindus mukorossi Gaertn." HortScience 57, no. 11 (2022): 1397–408. http://dx.doi.org/10.21273/hortsci16626-22.

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Nutrient deficiency leads to a high fruit abscission rate and low yields of Sapindus mukorossi Gaertn. (Soapberry), which is one of the most widely cultivated biodiesel feedstock forests in China. Exogenous sucrose can provide a solution to nutrient deficiency and fruit abscission leading to low yields; therefore, it was applied to whole trees at two stages, 20 days before blooming (DBB stage) and before fruit abscission [days before fruit abscission (DBFA) stage]. Six sucrose concentrations, 0%, 1%, 1.5%, 3%, 5%, and 7%, were sprayed three times using a completely randomized block design with five replications and six treatments. 13CO2 labeling experiments were performed after the three sprayings. The results indicated that the 3% treatment had the highest yield, reaching 15.9 kg/tree. During the DBB stage, the 3% treatment significantly increased the inflorescence fructose and glucose contents 1- to 1.2-times and resulted in the highest fruit gibberellic acid, leaf indole acetic acid (IAA), fruit IAA, and fruit zeatin contents; however, it decreased the inflorescence abscisic acid (ABA) from 16 μg/g to 4 μg/g. The 1.5% and 3% treatments significantly increased the carbohydrate content and decreased the fruit ABA content to 30% to 50% of the control level during the DBFA stage. High-concentration sugar treatment (>3%) increased the nitrogen, phosphorus, and potassium contents, which decreased the calcium and magnesium contents. The 13C-dispatching ability of the inflorescence was three-times greater than that of leaves under the high-concentration sugar treatment during the DBB stage. Supplying 1.5% sucrose nearly doubled the allocation capacity during the DBFA stage. The source-sink nutrient migration pathway showed that leaf and fruit sugars were directly correlated with phosphorus. Fruit fructose and glucose contents affected the leaf mineral element contents.

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Habe, Hiroshi, Jin-Sung Chung, Hiroyuki Kato, et al. "Characterization of the Upper Pathway Genes for Fluorene Metabolism in Terrabacter sp. Strain DBF63." Journal of Bacteriology 186, no. 17 (2004): 5938–44. http://dx.doi.org/10.1128/jb.186.17.5938-5944.2004.

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ABSTRACT Genes involved in the degradation of fluorene to phthalate were characterized in the fluorene degrader Terrabacter sp. strain DBF63. The initial attack on both fluorene and 9-fluorenone was catalyzed by DbfA to yield 9-fluorenol and 1,1a-dihydroxy-1-hydro-9-fluorenone, respectively. The FlnB protein exhibited activities against both 9-fluorenol and 1,1a-dihydroxy-1-hydro-9-fluorenone to produce 9-fluorenone and 2′-carboxy-2,3-dihydroxybiphenyl, respectively. FlnD is a heteromeric protein encoded by flnD1 and ORF16, being a member of the class III two-subunit extradiol dioxygenase. FlnE was identified as a serine hydrolase for the meta-cleavage products that yield phthalate.

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Heba, M. Elewe*. "ANGULAR BASED MODEL FOR RFID NETWORK PLANNING FOR WAREHOUSE MANAGEMENT SYSTEM." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 4, no. 10 (2017): 132–37. https://doi.org/10.5281/zenodo.1034499.

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Large scale warehouses often apply the RFID Network Planning (RNP) strategy to efficiently track assets, which can lead to significant revenue gain. For this reason, this research has developed a three dimension RFID network planning model that can improve warehouse management. The mathematical model of the RFID network planning is concerned with two major issues. The first one is the correlation between the reader height and the rack levels. The second issue is to specify the optimal tag coverage based on the elliptical interrogation reader range. The DBFA algorithm is used as a method to evaluate the deterministic indicators in NP hard problems. The current work has provided much superior results for three dimension large scale condition and observed the effectiveness in traditional warehouse layout. The research has presented a new perspective in achieving maximum volumetric coverage with optimal number of deployed readers.

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Picu, Mihaela. "A Study of Vertical Vibration Transmissibility by the Human Body." Applied Mechanics and Materials 325-326 (June 2013): 152–57. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.152.

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The transmission of longitudinal vibration (generated by the vibrating platform Brüel & Kjær 4827) in the whole body of ten subjects was investigated. Altogether 200 individual tests were made. Vibration was measured with 356A16 PCB Piezotronics triaxial accelerometers fixed to the toes, ankles, lumbar, cervical, fingers, elbow and shoulder. Vibrations were analyzed with a multiple acquisition vibrations system NetdB. Data were processed using dBFA Suite. Vibration time was 1min and frequency range was between 10-40Hz, because the low frequencies are the resonance frequencies for the human body. Body vibration transmissibility was determined by the ratio of root mean square acceleration signal from accelerometer by the root mean square of acceleration signal from the vibrating platform. It was found that the accelerations at the lumbar level are more attenuated than the accelerations at the ankle level.

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Du, Gaoming, Chao Tian, Zhenmin Li, et al. "Delay Bound Optimization in NoC Using a Discrete Firefly Algorithm." Electronics 8, no. 12 (2019): 1507. http://dx.doi.org/10.3390/electronics8121507.

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The delay bound in system on chips (SoC) represents the worst-case traverse time of on-chip communication. In network on chip (NoC)-based SoC, optimizing the delay bound is challenging due to two aspects: (1) the delay bound is hard to obtain by traditional methods such as simulation; (2) the delay bound changes with the different application mappings. In this paper, we propose a delay bound optimization method using discrete firefly optimization algorithms (DBFA). First, we present a formal analytical delay bound model based on network calculus for both unipath and multipath routing in NoCs. We then set every flow in the application as the target flow and calculate the delay bound using the proposed model. Finally, we adopt firefly algorithm (FA) as the optimization method for minimizing the delay bound. We used industry patterns (video object plane decoder (VOPD), multiwindow display (MWD), etc.) to verify the effectiveness of delay bound optimization method. Experiments show that the proposed method is both effective and reliable, with a maximum optimization of 42.86%.

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Bridges, Andrew A., Chenyi Fei, and Bonnie L. Bassler. "Identification of signaling pathways, matrix-digestion enzymes, and motility components controllingVibrio choleraebiofilm dispersal." Proceedings of the National Academy of Sciences 117, no. 51 (2020): 32639–47. http://dx.doi.org/10.1073/pnas.2021166117.

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Bacteria alternate between being free-swimming and existing as members of sessile multicellular communities called biofilms. The biofilm lifecycle occurs in three stages: cell attachment, biofilm maturation, and biofilm dispersal.Vibrio choleraebiofilms are hyperinfectious, and biofilm formation and dispersal are considered central to disease transmission. While biofilm formation is well studied, almost nothing is known about biofilm dispersal. Here, we conducted an imaging screen forV. choleraemutants that fail to disperse, revealing three classes of dispersal components: signal transduction proteins, matrix-degradation enzymes, and motility factors. Signaling proteins dominated the screen and among them, we focused on an uncharacterized two-component sensory system that we term DbfS/DbfR for dispersal of biofilm sensor/regulator. Phospho-DbfR represses biofilm dispersal. DbfS dephosphorylates and thereby inactivates DbfR, which permits dispersal. Matrix degradation requires two enzymes: LapG, which cleaves adhesins, and RbmB, which digests matrix polysaccharides. Reorientation in swimming direction, mediated by CheY3, is necessary for cells to escape from the porous biofilm matrix. We suggest that these components act sequentially: signaling launches dispersal by terminating matrix production and triggering matrix digestion, and subsequent cell motility permits escape from biofilms. This study lays the groundwork for interventions aimed at modulatingV. choleraebiofilm dispersal to ameliorate disease.

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Farhat, I. A. "A MODIFIED DYNAMIC BACTERIAL FORAGING ALGORITHM FOR AN ENHANCED POWER SYSTEM STATE ESTIMATION." مجلة الجامعة الأسمرية: العلوم التطبيقية 6, no. 5 (2021): 466–78. http://dx.doi.org/10.59743/aujas.v6i5.1501.

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Power systems are getting more complex with the ongoing growing of the ever changing energy demand. This dynamic situation of the electric power networks makes the control and monitoring of the system a crucial issue. In order to have an accurate real time monitoring and representative models, state estimation practices are essential. This requirement becomes more significant for nonlinear systems such as the electric power networks. The objective of the state estimation problem is to apply a variety of statistical and optimization methods in order to determine the best estimate of the power system variables. The variables of the power system are conventionally measured using various common metering devices in spite of the complexity and gradual expansion of the networks. However, these measuring meters are associated with errors and inaccurate output readings due to several operational, communicational and device-linked causes. Consequently, determining an improved and optimized estimation of the system state is significant and essentially needed, and hence this topic is getting more attraction among the researchers. The most typically applied approach to deal with the state estimation problem is the Weighted Least-squares (WLS) method. In this paper a hybrid algorithm is introduced utilizing a WLS-based dynamic bacterial foraging algorithm (DBFA). The proposed algorithm was applied and validated using the well-known IEEE 14-bus system. The results demonstrated the effectiveness and superiority of the algorithm when compared to some of other techniques used to tackle the state estimation issue

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Toyn, J. H., A. L. Johnson, and L. H. Johnston. "Segregation of unreplicated chromosomes in Saccharomyces cerevisiae reveals a novel G1/M-phase checkpoint." Molecular and Cellular Biology 15, no. 10 (1995): 5312–21. http://dx.doi.org/10.1128/mcb.15.10.5312.

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Saccharomyces cerevisiae dbf4 and cdc7 cell cycle mutants block initiation of DNA synthesis (i.e., are iDS mutants) at 37 degrees C and arrest the cell cycle with a 1C DNA content. Surprisingly, certain dbf4 and cdc7 strains divide their chromatin at 37 degrees C. We found that the activation of the Cdc28 mitotic protein kinase and the Dbf2 kinase occurred with the correct relative timing with respect to each other and the observed division of the unreplicated chromatin. Furthermore, the division of unreplicated chromatin depended on a functional spindle. Therefore, the observed nuclear division resembled a normal mitosis, suggesting that S. cerevisiae commits to M phase in late G1 independently of S phase. Genetic analysis of dbf4 and cdc7 strains showed that the ability to restrain mitosis during a late G1 block depended on the genetic background of the strain concerned, since the dbf4 and cdc7 alleles examined showed the expected mitotic restraint in other backgrounds. This restraint was genetically dominant to lack of restraint, indicating that an active arrest mechanism, or checkpoint, was involved. However, none of the previously described mitotic checkpoint pathways were defective in the iDS strains that carry out mitosis without replicated DNA, therefore indicating that the checkpoint pathway that arrests mitosis in iDS mutants is novel. Thus, spontaneous strain differences have revealed that S. cerevisiae commits itself to mitosis in late G1 independently of entry into S phase and that a novel checkpoint mechanism can restrain mitosis if cells are blocked in late G1. We refer to this as the G1/M-phase checkpoint since it acts in G1 to restrain mitosis.

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Aminov, Mirobbos Askar ugli. "MODELS OF PUBLIC-PRIVATE PARTNERSHIP, MECHANISMS OF IMPLEMENTATION." EURASIAN JOURNAL OF ACADEMIC RESEARCH 1, no. 4 (2021): 41–50. https://doi.org/10.5281/zenodo.5083313.

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Existing legal regulations based on different legal traditions and cultures, different levels of economic development and market relations, partnerships between public entities and the private sector in countries with different legal systems are different.  At the same time, based on the generalization of the experience of legal regulation of public-private partnership in different countries, models of public-private partnership are distinguished.

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Varrin, Angela E., Ajai A. Prasad, Rolf-Peter Scholz, Matthew D. Ramer, and Bernard P. Duncker. "A Mutation in Dbf4 Motif M Impairs Interactions with DNA Replication Factors and Confers Increased Resistance to Genotoxic Agents." Molecular and Cellular Biology 25, no. 17 (2005): 7494–504. http://dx.doi.org/10.1128/mcb.25.17.7494-7504.2005.

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ABSTRACT Dbf4/Cdc7 is required for DNA replication in Saccharomyces cerevisiae and appears to be a target in the S-phase checkpoint. Previously, a 186-amino-acid Dbf4 region that mediates interactions with both the origin recognition complex and Rad53 was identified. We now show this domain also mediates the association between Dbf4 and Mcm2, a key Dbf4/Cdc7 phosphorylation target. Two conserved sequences, the N and M motifs, have been identified within this Dbf4 region. Removing motif M (Dbf4ΔM) impairs the ability of Dbf4 to support normal cell cycle progression and abrogates the Dbf4-Mcm2 association but has no effect on the Dbf4-Rad53 interaction. In contrast, deleting motif N (Dbf4ΔN) does not affect the essential function of Dbf4, disrupts the Dbf4-Rad53 interaction, largely preserves the Dbf4-Mcm2 association, and renders the cells hypersensitive to genotoxic agents. Surprisingly, Dbf4ΔM interacts strongly with Orc2, while Dbf4ΔN does not. The DBF4 allele dna52-1 was cloned and sequenced, revealing a single point mutation within the M motif. This mutant is unable to maintain interactions with either Mcm2 or Orc2 at the semipermissive temperature of 30°C, while the interaction with Rad53 is preserved. Furthermore, this mutation confers increased resistance to genotoxic agents, which we propose is more likely due to a role for Dbf4 in the resumption of fork progression following checkpoint-induced arrest than prevention of late origin firing. Thus, the alteration of the M motif may facilitate the role of Dbf4 as a checkpoint target.

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Dissertations / Theses on the topic "DBFA"

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Trainer, Paul. "Zehn Jahre Biomasseforschung am DBFZ." DBFZ Deutsches Biomasseforschungszentrum gemeinnützige GmbH, 2018. https://slub.qucosa.de/id/qucosa%3A35650.

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Diniz, Mariana Cirillo. "A participação do estresse oxidativo e da inflamação na tolerância induzida pelo nitroprussiato de sódio." Universidade Federal de Minas Gerais, 2012. http://hdl.handle.net/1843/DBOA-92DJKB.

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Organic nitrates are used in cardiovascular disorders therapeutics. However, chronic use of organic nitrates leads to tolerance, a phenomenon characterized by reduction of its hemodynamic and anti-ischemic effects. Tolerance to nitroglycerin has been widely investigated, however, little is known about tolerance to other nitrovasodilators, such as sodium nitroprusside. Thus, the aim of this study was to investigate the possible in vitro SNP-tolerance, characterizing its mechanisms and the role of oxidative stress and inflammation in this phenomenon. Results demonstrated that SNP-tolerance is time-dependent and endothelium-independent. Tolerant aortas showed increased O2- anions production due to NADPH oxidase activation and NO synthase uncoupling, by depletion of the substrate, L-arginine. Higher O2- anions concentration leads to activation of COX-2, inducing enhancement in vasoconstrictor production, such as PGF2 and TXA2, which negatively modulate the relaxation induced by SNP in tolerant aorta. In addition, it was observed a positive relationship between tolerance phenomenon and inflammatory process, characterized by increased p65/NF-KB subunit expression levels, as well as, inflammatory cytokines (TNF-ct and IL-6), contributing to vascular dysfunction, characteristic of tolerance phenomenon.<br>Nitratos orgânicos são utilizados na terapêutica para o tratamento de distúrbios cardiovasculares. Entretanto, o tratamento crônico acarreta a ocorrência de tolerância, um fenômeno caracterizado pela diminuição dos efeitos hemodinâmicos e anti-isquêmicos destes vasodilatadores. Apesar de comprovada para a nitroglicerina, os estudos são escassos a respeito da ocorrência de tolerância desencadeada por nitroprussiato de sódio (NPS), um nitrato inorgânico. Desta forma, o objetivo do presente estudo foi investigar a possível indução de tolerância in vitro pelo NPS, caracterizar os mecanismos envolvidos e a participação de estresse oxidativo e de inflamação no fenômeno observado em aorta isolada de camundongo. Os resultados demonstraram que o NPS induz tolerância de maneira tempo-dependente e endotélio-independente. Aortas tolerantes apresentaram aumento na produção de ânions O2- devido à ativação da enzima NADPH oxidase e desacoplamento da enzima NO sintase. Este desacoplamento estaria relacionado à depleção do substrato L-arginina, gerando um quadro de estresse oxidativo. A concentração elevada de ânions O2- desencadeia a ativação da COX-2, culminando na produção exacerbada de PGF2 e TXA2, derivados vasoconstritores que acarretam a diminuição da potência de relaxamento do NPS em aortas tolerantes. Observou-se também relação positiva entre o fenômeno de tolerância e processo inflamatório caracterizado pelo aumento na expressão da subunidade p65/NF-KB e elevação da produção de citocinas inflamatórias (TNF-o e IL-6) que contribuem para o quadro de disfunção vascular, característico do fenômeno de tolerância.

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Aigner, Hans-Jörgen. "Hinzurechnungsbesteuerung und DBA-Recht /." Wien : Linde, 2004. http://www.gbv.de/dms/spk/sbb/recht/toc/385301790.pdf.

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Aigner, Hans J. "Hinzurechnungsbesteuerung und DBA-Recht /." Wien : Linde Verlag, 2004. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014700983&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Mah, Angie Siu Yee Dunphy William G. "Regulation of protein kinase Dbf2 in mitotic exit /." Diss., Pasadena, Calif. : California Institute of Technology, 2005. http://resolver.caltech.edu/CaltechETD:etd-05242005-130533.

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Braesch, Guillaume. "Electrocatalyseurs pour la Réaction d'Oxydation des Borohydrures : des surfaces modèles aux électrodes non-nobles de piles à combustible." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALI059.

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La pile à combustible directe à borohydrure (DBFC en anglais) est une technologie de pile à combustible prometteuse pour les applications portables et mobiles. L’utilisation de borohydrure de sodium (NaBH4) sous forme de poudre comme substitut à l’hydrogène gazeux (dans une PEMFC) présente des avantages pour le stockage du combustible et la sécurité du système. Une fois dilué dans une solution alcaline, une importante quantité d’énergie peut être obtenue via la réaction d’oxydation des borohydrures (BOR). Cependant, cette réaction est très complexe et met en jeu de nombreux intermédiaires et chemins réactionnels en fonction de l’électrocatalyseur utilisé. De plus, elle est très peu connue et est le plus souvent étudiée sur des électrocatalyseurs à base de métaux nobles : les métaux du Groupe du platine (PGM). Puisque le combustible est utilisé en milieu alcalin, il est possible de remplacer ces PGMs par des métaux non-nobles pour catalyser la réaction. Les objectifs principaux de cette thèse, qui s’inscrit dans le cadre du projet MobiDiC financé par l’Agence Nationale de Recherche (ANR), sont multiples. (i) Etudier les mécanismes de la BOR sur des électrocatalyseurs PGMs, en particulier dans des conditions de fonctionnement de DBFC (grande concentrations de borohydrures) : une attention particulière est apportée au palladium car le mécanisme de la réaction est très peu connu sur ce métal. (ii) Trouver un métal non-noble actif pour la BOR. (iii) Développer des anodes de DBFC peu couteuses avec une architecture optimisée pour maximiser leur efficacité pour le BOR.Les résultats regroupés dans ce manuscrit mettent en évidence l’empoisonnent de la surface des électrocatalyseurs PGM par des espèces réactionnelles intermédiaires, ce qui diminue grandement l’efficacité de la réaction, notamment à cause de cinétiques de transfert de charge plus lentes. La formation d’hydrures de palladium est manifeste en présence de borohydrures et modifie le chemin réactionnel de la BOR. Dans un second temps, des nanoparticules de nickel, obtenues par électrodéposition, ont démontré des performances très intéressantes pour la BOR ; cependant leur état d’oxydation doit être très précisément contrôlé et maintenu métallique. Des anodes de DBFC utilisant ces électrocatalyseurs non-nobles ont été développées ; sur support carbone, elles présentent des performances comparables à celles d’une anode à base de Pt. Dans le but d’optimiser leur activité, le support en carbone de ces anodes a finalement été remplacé par une structure 3D de Ni, qui permet d’obtenir des performances meilleures encore<br>Direct Borohydride Fuel Cell (DBFC) is a promising alkaline fuel cell technology for portable and mobile applications. The use of solid sodium borohydride powder (NaBH4) as a substitute fuel to gaseous hydrogen (in a PEMFC) is advantageous in terms of storage and safety concerns. Once diluted in a strong alkaline solution, it is possible to electro-oxidize it through the Borohydride Oxidation Reaction (BOR) which presents interesting properties in terms of energy generation. However, this anodic reaction is really complex and involves several intermediate species and reaction pathways. Moreover, in the pas it has been mainly investigated in laboratory conditions and using Platinum Group Metals (PGM) electrocatalysts. Meanwhile, since the BOR occurs in alkaline media it is possible to use non-noble materials to catalyse this reaction. The main objectives of this PhD, falling within the MobiDiC project funded by the French National Research Agency (ANR), are therefore (i) to explore the effect of the borohydride concentration on the reaction kinetics on the noble catalysts and particularly on palladium (since the mechanism of the BOR is poorly known on this metal), (ii) to find a non-noble material active towards the BOR and (iii) to develop low-cost DBFC anode with an optimized architecture to maximize its efficiency towards the BOR.The results presented in this manuscript highlight the important poisoning of the PGM catalysts surface by intermediate species, which results in significant BOR efficiency loss mainly owing to slower charge transfer kinetics. Palladium hydrides were demonstrated to form in presence of borohydride, modifying the pathway of the reaction. In a second time, nickel nanoparticles, obtained by electrodeposition, were proven as performing non-noble catalysts only if their state of surface is precisely controlled and maintained metallic. DBFC performance matching the one using Pt-based anode was obtained with this Ni-based electrocatalysts supported on carbon paper. From this point, the anode support was replaced by Ni 3D structure and optimized to reach higher performance

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Sherwood, Nicholas. "An IPsec Compatible Implementation of DBRA and IP-ABR." Digital WPI, 2005. https://digitalcommons.wpi.edu/etd-theses/738.

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Satellites are some of the most difficult links to exploit in a Quality of Service (QoS) sensitive network, largely due to their high latency, variable-bandwidth and low-bandwidth nature. Central management of shared links has been shown to provide efficiency gains and enhanced QoS by effectively allocating resources according to reservations and dynamic resource availability. In a modern network, segregated by secure gateways and tunnels such as provided by IPsec, central management appears impossible to implement due to the barriers created between a global Dynamic Bandwidth Resource Allocation (DBRA) system and the mediators controlling the individual flows. This thesis explores and evaluates various through-IPsec communications techniques aimed at providing a satellite-to-network control channel, while maintaining data security for all communications involved.

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Ferreira, Manuel Joaquim Monteiro. "O DBA atual: desafios e soluções." Master's thesis, Universidade de Évora, 2018. http://hdl.handle.net/10174/25448.

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A área de sistemas da Liberty Seguros S.A., é responsável, entre tantas outras plataformas, pela gestão das bases de dados Oracle do negócio em todos os seus vetores de intervenção, desde a segurança ao desempenho. Atualmente no mercado e não apenas na nossa estrutura é solicitada a disponibilidade do serviço em modo 24 horas por dia, 7 dias por semana. Apesar de existirem equipas que acompanham o funcionamento da plataforma em permanência, essas equipas não têm todas as competências necessárias nem as ferramentas para efetuarem uma série de operações à distância. No âmbito em questão e fazendo eu parte desta equipa, pretendi criar uma aplicação que responda aos desafios que esta gestão coloca no dia-a-dia à nossa equipa e simultaneamente introduzir a possibilidade de alargar a solução a outras plataformas de base de dados; Abstract: The infrastructure team of Liberty Seguros S.A. is responsible, among many other platforms, for managing the Oracle databases supporting the business, in all its vectors of intervention, from security to performance. Currently in the market, and not only in our structure, the demand for availability of the service requested is 24 hours a day, 7 days a week. Although there are teams that accompany the operation of the platform at all times, these teams do not have all the necessary skills nor the tools to perform a series of remote operations. In the scope in question and being part of this team, we intend to create an application that responds to the challenges that this management puts in our day-to-day basis and simultaneously introduce the possibility of extending the solution to other database platforms.

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Gurram, Vikas. "Assessing the rise of Design-Build-Finance Delivery in Transportation Infrastructure." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/98823.

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While other alternative project delivery methods have emerged to address the limitations of Design-Bid-Build, Design-Build-Finance (DBF) has surfaced more recently. Although DBF has gained prominence in the past decade, research pertaining to this method is limited. Consequently, this research investigated the use of DBF for the delivery of transportation infrastructure by five State DOTs: Florida, North Carolina, Georgia, Michigan and Texas through a combination of interviews with DOT personnel and investigation of completed or on-going DBF projects. To complement this, subject matter experts (SMEs) were interviewed to obtain a more general market perspective of DBF. As a result, two variants of DBF, DBF – Receivables and DBF – Risk Transfer, were identified; the DOTs investigated and the US more broadly, primarily use the DBF - Receivables variant where the contractor is entitled to payments for the activities completed irrespective of the project's completion. Whereas in the DBF – Risk Transfer variant, the contractor's payments are linked to the completion of the project. Further, DBF is employed on projects that are (i) in need of acceleration, which generates (ii) social and economic benefits such as congestion relief and safety enhancements; such projects are also (iii) subjected to short-term budgetary restrictions, but they typically have (iv) funds programmed in the future. The distinction found in the variants of DBF provides a better understanding of the drivers of DBF, which were validated through interviews. In practice, this distinction also aids public agencies in better identification of the appropriate project delivery method for a given project.<br>Master of Science<br>Infrastructure projects are complex with many stakeholders involved in different stages of the project lifecycle. Design-Bid-Build (DBB) is the conventional method of project delivery for government agencies in the United States for delivery of infrastructure in the in 20th century due to legislation like the Brooks Act of 1972. Alternative project delivery methods, which can be classified into Capital Delivery Methods like Design-Build (DB) and Lifecycle Approach Methods like Design-Build-Finance-Operate-Maintain (DBFOM), have recently re-emerged to overcome the shortcomings of DBB. Design-Build-Finance (DBF) is one such alternative delivery method that has been increasingly used in the past decade to aid public transportation agencies to meet growing infrastructure needs. Significant research has been conducted to determine the drivers of alternative delivery methods like DB and DBFOM. The potential benefits of DBFOM are not found in DBF since a contractor is not involved in the operations and maintenance stages of a project. Moreover, current literature on DBF is limited since it is a contemporary phenomenon. In the US, 11 transportation projects were identified that employed DBF in the past decade. To understand why public agencies are using DBF, this research examined DBF programs in five states using a mix of interviews of key stakeholders and a review of available project documentation. Two variants of DBF with different payment structures and risk profiles were uncovered. Further, agencies tend to employ DBF to accelerate the timeline of a project that has funds programmed in later years and to realize the associated social and economic benefits such as congestion relief or improved safety. However, agencies must consider potential disadvantages such as increased oversight and financing costs when deciding whether or not to use this method.

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Breuer, Almut [Verfasser]. "Gewinntransfers im Recht der DBA / Almut Breuer." Baden-Baden : Nomos Verlagsgesellschaft mbH & Co. KG, 2014. http://d-nb.info/1108809502/34.

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Books on the topic "DBFA"

1

Gibson, Bill. The DBSA macromodel. Development Bank of Southern Africa, 1997.

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Inc, Management Information Technology, ed. DBA*MASTER user's guide, version 2.1 (UNIX), version 2.05 (VAX/VMS). Management Information Technology, 1993.

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LaRock, Thomas. DBA Survivor. Apress, 2010. http://dx.doi.org/10.1007/978-1-4302-2788-5.

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Malcher, Michelle. DBA Transformations. Apress, 2018. http://dx.doi.org/10.1007/978-1-4842-3243-9.

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service), SpringerLink (Online, ed. DBA Survivor: Become a Rock Star DBA. Apress, 2010.

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Held, Andrea, Mirko Hotzy, Lutz Fröhlich, et al. Der Oracle-DBA. Carl Hanser Verlag GmbH & Co. KG, 2011. http://dx.doi.org/10.3139/9783446429338.

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Peasland, Brian. Oracle DBA Mentor. Apress, 2019. http://dx.doi.org/10.1007/978-1-4842-4321-3.

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Bryla, Bob. Oracle9i DBA JumpStart. John Wiley & Sons, Ltd., 2006.

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Schönfeld, Jens, and Xaver Ditz, eds. Doppelbesteuerungsabkommen (DBA) - Kommentar. Verlag Dr. Otto Schmidt, 2013. http://dx.doi.org/10.9785/ovs.9783504380137.

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Marlene, Theriault, ed. Oracle9i DBA handbook. McGraw-Hill/Osborne, 2002.

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Book chapters on the topic "DBFA"

1

Masai, Hisao. "Dbf4." In Encyclopedia of Signaling Molecules. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-67199-4_186.

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Masai, Hisao. "Dbf4." In Encyclopedia of Signaling Molecules. Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4614-6438-9_186-1.

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Lukas, Thomas J., Daniela V. Rosa, Luiz Alexandre V. Magno, et al. "Dbf4." In Encyclopedia of Signaling Molecules. Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0461-4_186.

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Weik, Martin H. "dBa." In Computer Science and Communications Dictionary. Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_4426.

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Niedereichholz, Joachim, and Gerhard Kaucky. "Datenbankadministration (DBA)." In Datenbanksysteme. Physica-Verlag HD, 1992. http://dx.doi.org/10.1007/978-3-642-86095-9_10.

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McDonald, Connor, Chaim Katz, Christopher Beck, Joel R. Kallman, and David C. Knox. "DBA Packages." In Mastering Oracle PL/SQL: Practical Solutions. Apress, 2004. http://dx.doi.org/10.1007/978-1-4302-0702-3_7.

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Weik, Martin H. "dBa(F1A)." In Computer Science and Communications Dictionary. Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_4427.

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Weik, Martin H. "dBa(HA1)." In Computer Science and Communications Dictionary. Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_4428.

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Steinmeister, Nicolas. "Vereinbarkeit mit deutschen Doppelbesteuerungsabkommen." In Die Mindestbesteuerung multinationaler Konzerne. Springer Fachmedien Wiesbaden, 2024. http://dx.doi.org/10.1007/978-3-658-44059-6_7.

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ZusammenfassungDie im Rahmen von GloBE zu erhebenden Steuern fallen unter den Steuerbegriff der deutschen DBA, sodass die GloBE-Regeln auf ihre Vereinbarkeit mit den weiteren Abkommensvorschriften untersucht werden können. Diese Untersuchung zeigt durchaus Konfliktpotenzial auf. So kann in Bezug auf die IIR eine Regelungskollision mit Art. 7 Abs. 1 Satz 1 DE-VG nicht mit Sicherheit ausgeschlossen werden. Die Anwendung der SOR könnte deutschen DBA und den darin enthaltenen Freistellungsmethodenartikeln widersprechen, sollte die SOR nicht selbst in das jeweilige DBA aufgenommen werden. Die UTPR in der Erhebungsform der Quellensteuer dürfte regelmäßig mit den Art. 7 Abs. 1 Satz 1, Art. 11 Abs. 1 und Art. 12 Abs. 1 DE-VG kollidieren. Auch können je nach Auslegung des Abkommensrechts und Ausgestaltung der UTPR Konflikte zwischen der UTPR als Abzugsbeschränkung mit Art. 9 Abs. 1 und Art. 23 Abs. 4 DE-VG entstehen. Während die im Blueprint angeführte Saving Clause nicht zur deutschen Abkommenspraxis gehört und folglich keine der angeführten Konflikte zu lösen vermag, sollten Abkommensregelungen i. S. d. Art. 28 Abs. 1 DE-VG eine Regelungskollision der GloBE-Regeln mit bestehenden deutschen DBA verhindern. Für Fälle, in denen eine solche Klausel nicht Teil des deutschen DBA ist, wird eine Änderung der entsprechenden Abkommen zur rechtssicheren Umsetzung empfohlen.

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Malcher, Michelle. "Types of DBAs." In DBA Transformations. Apress, 2017. http://dx.doi.org/10.1007/978-1-4842-3243-9_1.

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Conference papers on the topic "DBFA"

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Sebastien, Rougerie, Ferrando Nicolas, Berland Cćline, Bouisson Emmanuel, Romain Contreres, and Fouquet Olivier. "A new DBFN ground station for European Launcher TM Tracking." In 2024 IEEE International Symposium on Antennas and Propagation and INC/USNC‐URSI Radio Science Meeting (AP-S/INC-USNC-URSI). IEEE, 2024. http://dx.doi.org/10.1109/ap-s/inc-usnc-ursi52054.2024.10687129.

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Yu, Pengbo, Flavio Ponzina, Alexandre Levisse, et al. "DBFS: Dynamic Bitwidth-Frequency Scaling for Efficient Software-defined SIMD." In 2024 IEEE Computer Society Annual Symposium on VLSI (ISVLSI). IEEE, 2024. http://dx.doi.org/10.1109/isvlsi61997.2024.00046.

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Bhuyan, Mausri, Anshu Kumar U, Aditya Narayan, and Akshat Shaji. "Frequency Analysis in a Combined Hybrid Micro Grid Tuned by DBOA Algorithm." In 2024 IEEE Third International Conference on Power Electronics, Intelligent Control and Energy Systems (ICPEICES). IEEE, 2024. http://dx.doi.org/10.1109/icpeices62430.2024.10719105.

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Souza Junior, Fernando Gomes de, Thiago Koichi Anzai, Príamo Albuquerque Melo Junior, Márcio Nele de Souza, and José Carlos Pinto. "PROPRIEDADES ELÉTRICAS DE POLIANILINA DOPADA COM DBSA PREPARADA EM MEIO AQUOSO NÃO AROMÁTICO." In 62º Congresso anual da ABM. Editora Blucher, 2007. https://doi.org/10.5151/2594-5327-2005-14872-0069.

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Sun, Sam-Shajing, Muhammad Hasib, Alexander V. Gavrilenko, Joshua Devan, and Vladimir Gavrilenko. "Bridge effects on light harvesting of a DBfA type polymer system." In SPIE Organic Photonics + Electronics, edited by Zakya H. Kafafi, Paul A. Lane, and Ifor D. W. Samuel. SPIE, 2016. http://dx.doi.org/10.1117/12.2239027.

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Bowsher, Andrew, Cary A. Gloor, Bruce Griffiths, and Chris McMahon. "Design Based Failure Analysis of a Voltage Sensitive Memory Defect." In ISTFA 2011. ASM International, 2011. http://dx.doi.org/10.31399/asm.cp.istfa2011p0382.

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Abstract The semiconductor failure analyst’s tool box is a vast and resourceful set of capabilities that more than ever needs meaningful Memory Failure Signature Analysis (Memory FSA) as an important part of that suite. Today, this is driven by advanced process technology nodes that are producing virtually invisible defects to confound manufacturing and reliability. This demands greater attention to characterizing memory failures in order to theorize causes for failure and to implement suitable FA approaches and corrective action plans. Design Based FA (DBFA) techniques aim to extend this philosophy by focusing on a deep understanding of the chip’s Intellectual Property (IP), in terms of both content and architecture. It uses this knowledge to gain important insights into the behavior of the failure that otherwise may have been hidden or unobservable. This disciplined methodology leads to quicker closure for problems through implementing improved test screens, providing recommendations under a closed-loop Design for Manufacturing (DFM) system, enacting process enhancements, or some combination of all these areas. Here we present a clever technique to further aid in the failure signature analysis process and use it as an example for this Design Based FA methodology.

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David, N. V., M. N. Zainal, and M. J. M. Nor. "Determination of the Effects of Air Gap and Hind Support on the Sound Absorption Coefficient of Biobased and Foam Materials." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86539.

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The sound absorption characteristics of wooden and porous materials including fibrous media and porous foams vary with the nature of their surface porosity. The low frequency absorption, which is of interest in noise control engineering, of these material types is generally enhanced by introducing an air gap of a certain width or a flexible support at the rear face of the material posterior to the impinging sound waves. This study investigates the effect of air gap with and without hind support on the low frequency absorption of a kenaf/epoxy composite, a Meranti wood, a low-density rigid foam and a high-density rigid foam. The sound absorption coefficient of these materials are determined using the two-microphone impedance tube transfer-function method according to ISO 10534-2 standard in the frequency range between 20 Hz and 1600 Hz. In this study, 5-mm, 10-mm, 50-mm and 100-mm wide air gaps are introduced at the posterior of the specimens to measure the influence of the quarter-wavelength absorption on sound absorption coefficient. Backing panels made from polyethylene are used to study the effect of hind support on sound absorption coefficient at different frequencies. The dBFA Suite 4.8.1 program is used to acquire and process the acoustic signals and the SCS8100 software package is employed for the computation of sound absorption coefficient. The sound absorption coefficient and characteristics of each material within the range of frequency tested are discussed based on the width of air gap (i.e., the quarter-wavelength effect) in tandem with the presence or absence of the hind support. It is found that the low frequency absorption of the high-density foam with the hind support improved the absorption by 50% as the air gap is increased from 0 to 100 mm. The opposite effect is observed for the other materials tested whereby the sound absorption coefficient is reduced by 30 to 40% with the hind support.

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Trinca, Giovan Battista, Nicola Ronchi, Fausto Fusari, and Emanuele Fiordaligi. "Alternative Design Approach by Finite Element Analysis for High Pressure Equipment." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21540.

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Abstract Components that are subject to pressure, typical of the pressure vessel industry, can be designed using such calculation methods as “Design by Rule-DBF” or “Design by Analysis-DBA”. DBA, based on the FEM, is used increasingly often because, in addition to providing a reduction in thickness due to the lower uncertainty on the calculation, it helps to verify and study physical phenomena and complex geometry that are otherwise difficult to research while offering a more intuitive usability of the results. In this paper we wish to offer, in an educative and qualitative manner, a general overview of DBA from the creation of the model to obtaining the results, describing the types of analysis that can be carried out according to the constitutive model of the material used and the degree of accuracy that can be achieved. At the end, we cover some case studies in which DBA has been successfully used to verify design or particular conditions (such as heat treatments) for pressure vessels fabrication. The DBA calculation, described in this paper, is used with the same computational methods for high, medium or low pressure components, but it is clear that the most significant reduction in thickness is for high pressure components such as reactors, which is why the DBA calculation is particularly appreciated for this type of equipment. In the context of this paper “high pressure equipment” means when the ratio of the inner diameter to thickness of the walls is &lt; 30.

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Kätevä, Janne, Perttu Laurinen, Taneli Rautio, Jaakko Suutala, Lauri Tuovinen, and Juha Röning. "SE-155 DBSA." In the 2010 ACM Symposium. ACM Press, 2010. http://dx.doi.org/10.1145/1774088.1774562.

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"DBTA 2010 Organizing Committee." In 2010 2nd International Workshop on Database Technology and Applications (DBTA). IEEE, 2010. http://dx.doi.org/10.1109/dbta.2010.5659038.

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Reports on the topic "DBFA"

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บูรณากาญจน์, วรสัณฑ์, เดโช สุขเกษม, สราวุธ โสนะมิตร, อรรถพล ชูสุวรรณ, ภัทรภณ บูรณากาญจน์ та สุภรินี จีระพันธุ์. รายงานการศึกษาวิจัยเพื่อแก้ปัญหาเรื่องเสียงรบกวนจากสนามยิงปืน. จุฬาลงกรณ์มหาวิทยาลัย, 2014. https://doi.org/10.58837/chula.res.2014.82.

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ค่าการสะท้อนเสียงของสนามยิงปืน เมื่อติดตั้งวัสดุดูดซับเสียง โดยใช้ฉนวนใยแก้ว 4 ตารางเมตร RT60 อยู่ระหว่าง 0.71-0.94 วินาที ลดลงจากเดิม 0.08-0.48 วินาที (ค่าจากการคำนวนประมาณ 0.89 วินาที) ผลการเก็บข้อมูลเปรียบเทียบก่อนและหลังการใช้ฉนวนทดสอบจำนวน 4 ตารางเมตร พบว่า 1. ความดังเสียงกระสุนขนาด .22 มีความดังลดลงเฉลี่ย 5 ถึง 10 เดซิเบล (dBA) 2. ความดังเสียงกระสุนขนาด .38 มีความดังลดลงเฉลี่ย 2 ถึง 5 เดซิเบล (dBA) 3. ความดังเสียงกระสุนขนาด .45 มีความดังลดลงเฉลี่ย 2 ถึง 5 เดซิเบล (dBA) เมื่อติดตั้งฉนวนบริเวณช่องยิง ผนังด้านหลังช่องยิง ฝ้าเพดาน และคานด้านหน้าช่องยิง ค่า NRC ประมาณ 1.05 รวมพื้นที่ประมาณ 140-150 ตารางเมตร จะสามารถลดปริมาณความดังเสียงประมาณ และค่าการสะท้อนเสียง RT-60 ประมาณ 0.56 วินาที ตามผลการคำนวณ ผลการทดสอบกรณีศึกษา โดยการใช้วัสดุดูดซับเสียงจำนวน 4 ตารางเมตร เพื่อเก็บข้อมูลความดังเสียง ตลอดจนการลดความดังเสียงสะท้อนภายในสนามยิงปืนเบื้องต้น ของสนามยิงปืนระยะ 25 เมตร สรุปได้ว่า การใช้วัสดุดูดซับเสียงที่ผู้วิจัยกำหนด สามารถลดความดังเสียงลงได้ 2 ถึง 10 เดซิเบล และลดค่าการสะท้อนเสียงของห้องลงได้ ประมาณ 0.05 วินาที การใช้ฉนวนที่มีพื้นที่เพียง 4 ตารางเมตร เป็นเพียงพื้นที่ประมาณ ร้อยละ 3 ของพื้นที่ดูดซับเสียงในการออกแบบและเสนอแนะของนักวิจัย ดังนั้น การใช้วัสดุดูดซับเสียงเพื่อติดตั้ง บนฝ้าเพดาน ผนังด้านหลัง ผนังด้านข้างพื้นที่ช่องยิง และผนังกั้นระหว่างช่องยิงนั้น จะสามารถช่วยลดความดังของเสียงลงได้ การใช้สนามยิงปืนโดยปกติ จะมีแหล่งกำเนิดเสียงมากที่สุด เพียง 8 จุด ตามช่องยิง ซึ่งพลังงานเสียงที่ก่อให้เกิดความดังนั้น จะมีพลังงานและความดังเพิ่มขึ้นไม่เกิน 10 เดซิเบล (dBA) เมื่อผู้ใช้สนามยิงปืนพร้อมๆ กัน ดังนั้น การติดตั้งวัสดุดูดซับเสียงตามที่ผู้วิจัยเสนอยังสามารถดูดซับเสียงได้ เพียงพอกับปริมาณแหล่งกำเนิดเสียง เมื่อผู้ใช้สนามยิงปืน ใช้เครื่องป้องกันเสียงครอบที่หู จะช่วยป้องกันความดังเสียงได้อีกระดับหนึ่ง การลดความดังเสียงจากสนามยิงปืนที่ไปรบกวนสภาพแวดล้อมภายนอกนั้น หากความดังของเสียงไม่มากกว่า 80 ถึง 90 เดซิเบล ซึ่งเป็นค่าความดังของเสียงที่เกิดขึ้นจากท้องถนนสาธารณะ ที่มีแหล่งกำเนิดเสียงจากรถยนต์ มอเตอร์ไซค์ และรถบรรทุกสาธารณะ ซึ่งผู้ที่อยู่โดยรอบได้ยินเสียงที่ความดังในระดับนี้เป็นประจำทุกวัน

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Antunes, Pedro Eiras. Case Study: Algarve SCUT - Monoline Insured Shadow Toll Motorway. Inter-American Development Bank, 2005. http://dx.doi.org/10.18235/0006721.

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Presentation dictated during the event "Experiencias de Provisión y Financiamiento de Infraestructura bajo Alianzas Publico-Privadas", held at the Inter-American Development Bank, Washington D.C., USA, December 8-9, 2005. It describes de project in Portugal involving the design, construction/widening, O&M, and financing (DBFO) over 30 years of 129 Km of motorway and associated infrastructure along the Algarve Coast, from Castro Marim (near the Guadiana River) to the city of Lagos in the West.

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Jaimovich, Dany, and Ugo Panizza. Public Debt around the World: A New Dataset of Central Government Debt. Inter-American Development Bank, 2006. http://dx.doi.org/10.18235/0010859.

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Commonly used datasets on the level of public debt provide incomplete country and period coverage. This paper presents a new dataset that includes complete series of central government debt for 89 countries over the 1991-2005 period and for seven other countries for the 1993-2005 period. The data set can be found at: http://www.iadb.org/res/pub_desc.cfm?pub_id=DBA-005

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Meyer, Erik, and Cathleen Balantic. Minidoka National Historic Site: Acoustic monitoring report, 2022. National Park Service, 2024. http://dx.doi.org/10.36967/2303680.

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This study arose from the Minidoka National Historic Site (MIIN) Technical Assistance Request (TAR; #21332), which identified the need for baseline acoustic surveys to understand potential impacts to the acoustic environment from nearby proposed renewable energy development. From September through October 2022, the Natural Sounds and Night Skies Division (NSNSD) gathered acoustic data at one site in MIIN to provide park managers with baseline information about the acoustic environment, including existing ambient sound levels and time-above noise effect levels. Overall, existing median ambient sound levels (LA50) at MIIN were 30.0 dB during the day and 33.1 dB at night. In the ANS-weighted frequency range, the sound level 35 dB (LAeq, 1s), was exceeded 24.2% of the day and 18.2% of the night. All other key sound levels (i.e., 45 dB and above) during the day and night were exceeded less than 4% of the time. Due to an error in the acoustic recording schedule, some NSNSD metrics are not included. As a supplement, a geospatial sound model predicts existing and natural ambient sound levels at MIIN are 32.8 (dBA) and 23.5 (dBA), respectively.

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Tucker, David, Scott Swartz, and Paolo Pezzini. Abstract – Cooperative Research and Development Agreement among Ames Laboratory; NexTech Materials, Ltd. dba Nexceris; and National Energy Technology Laboratory. Office of Scientific and Technical Information (OSTI), 2021. http://dx.doi.org/10.2172/1862658.

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Olstad, Tyra, Erik Meyer, Erik Meyer, and Tyra Olstad. Carlsbad Caverns National Park: Acoustic monitoring report, 2019. National Park Service, 2024. http://dx.doi.org/10.36967/2305265.

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This study arose from Carlsbad Cavern National Park?s (CAVE) Technical Assistance Request (TAR; #9250), which identified the need for a baseline acoustic inventory to help understand the park?s existing wilderness character and evaluate potential acoustic impacts from military and civilian overflights. From late October to mid-December 2019, the Natural Sounds and Night Skies Division (NSNSD) gathered acoustic data at one site in CAVE to provide park managers with baseline information about the acoustic environment, including existing ambient sound levels and time-above noise level metrics in the park?s wilderness area. Overall, existing median ambient sound levels (LA50) at CAVE were remarkably quiet at 21.0 dB during the day and 20.1 dB at night. In the lower frequency range (20 ? 1,250 Hz), the sound level of 35 dB (LAeq, 1s), indicative of quiet environments was exceeded only 3.18% of the day and 0.81% of the night. All other key sound levels (i.e., 45 dB and above) were exceeded less than 0.25% of the time. Due to an error with the acoustic recording device, metrics requiring off-site listening could not be determined. As a supplement, a geospatial sound model is used to predict existing and natural ambient sound levels of 32.3 (dBA) and 29.8 (dBA), respectively, with localized impacts from anthropogenic noise.

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Shekhawat, Dushyant, and Ignasi Palou-Rivera. Abstract – Cooperative Research and Development Agreement between National Energy Technology Laboratory and American Institute of Chemical Engineers dba RAPID Manufacturing Institute. Office of Scientific and Technical Information (OSTI), 2024. https://doi.org/10.2172/2372702.

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Krasnov, A. V., and I. V. Deryabin. Practical method for reducing the noise of a vehicle heating and ventilation installation. КШП. ОМД, 2024. https://doi.org/10.12731/avkrasnovivderyabin.

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Studies of the acoustic radiation of a heating and ventilation unit were carried out on a test bench mounted in an anechoic chamber, with several design options for the housing and control dampers of the heating and ventilation unit containing sound-absorbing elements. Graphic dependences of one-third octave values of sound levels at the studied measuring point at all rotation speeds of the electric fan impeller are presented. A conclusion is made about the effectiveness of the lining of the housing walls, which allows achieving a reduction in overall noise levels to 4.1 dBA.

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Meyer, Erik. Tule Springs Fossil Beds National Monument: Acoustic monitoring report 2019–2020. National Park Service, 2025. https://doi.org/10.36967/2309981.

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This study arose from a Tule Springs Fossil Beds National Monument (TUSK) technical assistance request titled “Soundscape Monitoring”, which identified the need for baseline acoustic surveys in the newly created park. Therefore, across one season in 2019, the Natural Sounds and Night Skies Division (NSNSD) gathered acoustical data at two sites in TUSK to provide park managers with information about the acoustical environment, sources of noise, and the natural and existing ambient sound levels within the park. On average, noise was present from 77 to 100 percent of the time across the two sites. The most common sources of noise were vehicles, aircraft, and unknown non-natural sounds. The maximum percent time audible for any detailed noise source were vehicles at site TUSK001, audible for 94% of a 24-hr period. Unknown non-natural noise was most audible at site TUSK002 (38%), followed by vehicles (37%). Overall, existing ambient sound levels (LA50) at sites within TUSK ranged from 27.3–31.9 dB during the day and 21.1–28.2 dB at night during the sampling period. Natural ambient sound levels (LAnat) at sites within TUSK ranged from 21.7–26.8 dB during the day and 18.1– 23.9 dB at night, although these measurements were likely influenced by the high prevalence of noise. In total, these results suggest that the TUSK acoustic environment is influenced by lower level, but very consistent noise. As a supplement, a geospatial sound model predicts existing and natural ambient sound levels at TUSK are 34.0 (dBA) and 21.4 (dBA), respectively.

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Meyer, Erik. Cabrillo National Monument: Acoustic monitoring report, 2021. National Park Service, 2024. http://dx.doi.org/10.36967/2303446.

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Abstract:

This study arose from the Cabrillo National Monument (CABR) Resource Stewardship Strategy (RSS), which identified the need for baseline acoustic surveys in the park. One of the RSS stewardship goals was to minimize anthropogenic sounds outside and inside park boundaries to enhance the visitor experience. A Technical Assistance Request (TAR) for natural sounds inventory was submitted to the Natural Sounds and Night Skies Division. Therefore, in May 2021, the NSNSD gathered acoustic data at two sites in CABR to provide park managers with information about the acoustic environment, sources of noise, and the existing ambient sound levels within the park. On average, noise was present from 95 to 99 percent of the time across the two sites. The most common sources of noise were aircraft, motor sounds, and a foghorn. The maximum percent time audible for any detailed noise source was the foghorn at site CABR001, audible for 95% of a 24-hr period over 10 days of listening. Motor sounds were most audible at site CABR002, audible for 68% of the time. Overall, existing ambient sound levels (LA50) at sites at CABR were 39.5 and 43.1 dB during the day and 34.7 and 42.5 dB at night during the sampling period (CABR001 and CABR002, respectively). Natural ambient sound levels (LAnat) were 30.2 and 38.0 dB during the day and 26.6 and 38.4 dB at night for CABR001 and CABR002 respectively, although these measurements were likely influenced by the high prevalence of noise. As a supplement, a geospatial sound model predicts existing and natural ambient sound levels at CABR are 46.0 (dBA) and 31.4 (dBA), respectively.

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