Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 21 for “"DNB"”.
-
Prediction of departure from nucleate boiling in PWR fast power transients
… transient Departure from Nucleate Boiling (DNB) models, for fast power transients under forced convective heat exchange conditions. Theoretical DNB models based on liquid film thickness variation are adapted and modified from existing studies into a generalized formulation to allow …
-
Design and Construction of a Subcooled Boiling Flow Loop with an Internally Heated Vertical Annulus for Use in Testing Departure from Nucleate Boiling (DNB)
<p>The design and testing of an apparatus to use in subcooled boiling flow experiments. A vertical annulus flow loop was design to mimic a rod used in a reactor boiler. The system was tested at different velocities and temperatures to verify it could be used in a range of experiments to try and …
-
An inverted pressurized water reactor design with twisted-tape swirl promoters
… steady state departure from nucleate boiling (DNB) constraints. While the thermal power is already higher than that of typical pressurized water reactors (PWRs), it is still possible to achieve higher power by improving the DNB performance of the design. Unlike the conventional pin geometry in …
-
Dynamic Connected Automated Vehicle Trajectory and Traffic Signal Timing Optimization
… dynamic Decentralized Nash Bargaining (DNB) traffic signal controller is developed to optimize traffic signal operations using traffic stream density predictions, a flexible National Electrical Manufacturers Association (NEMA) phasing scheme, and dynamically adaptable control time steps. …
-
Estudo da bile por drenagem nasobilar na coledocolitiase apos esfincterotomia endoscopica : descricao de tecnica e analise bacteriologica
… salientar o potencial da drenagem nasobiliar (DNB) como uma forma não cirúrgica de acesso à bile, utilizando como modelo uma téc- nica de DNB no estudo bacteriológico da bile em pesquisa. Para tal, foram estudados 17 pacientes portadores de coledo- colitíase submetidos eletivamente à …
-
Investigations of chiral recognition of conformationally rigid chiral stationary phases
… the resolution of $\pi$-acidic dinitrobenzoyl (DNB) amino acid derivatives on several DNB $\pi$-acidic CSPs has been carried out. Related to these studies, X-ray crystallographic structure determinations have been pursued in a quest for the origins of chiral-self recognition.
-
Synthetic Approaches to Organaylselenium and Tellurium Semi-Conductors
… (TCNQ), Chloranil (TCQ) and pdinitrobenzene (DNB) were chosen as acceptors. Solid state conductivity measurements have been employed for the charge-transfer complexes...
-
Influence of wettability on boiling heat transfer and critical heat flux in vertical flow boiling
… on the departure from nucleate boiling (DNB) through surface modifications and coatings, though many of these studies are limited to pool boiling systems. In this thesis, the surface wettability influence is studied on the boiling curves and specifically the point of DNB. A femtosecond …
-
Medication-Related osteonecrosis of the jaw in women with breast cancer. a literature review /
… metastases. Bisphosphonates (BPs) and Denosumab (DNB) are key bone-modifying agents (BMAs) used to target bone metabolism, reduce metastatic risk, and enhance adjuvant therapy efficacy in early-stage breast cancer. However, the usage of these agents carries risks, including adverse events such as …
-
Stillbirth and trauma associated sleep disturbances: A population-based study of 27,605 women
… likely to report disruptive nocturnal behavior (DNB), such as vocalizations or dream enactment behavior and trauma-related nightmares or memories than other women (p<0.05). Among women who had experienced stillbirth, TASD symptoms were associated with young age (≤39 years), being single, inactive …
-
Departure from nucleate boiling and pressure drop prediction for tubes containing multiple short-length twisted-tape swirl promoters
… minimum departure from nucleate boiling ratio (MDNBR). In order to increase the power density of the IPWR, Ferroni [231 examined the possibility of inserting multiple short-length twisted-tapes (MSLTTs) in the cooling channels. For a fixed coolant mass flow rate, the swirling flow produced by the …
-
Transient flow boiling CHF under exponentially escalating heat inputs
… crisis, e.g. by departure from nucleate boiling (DNB), in turn leading to fuel damage. The aim of the current work is to improve the understanding of transient DNB phenomena. This goal was achieved by running experiments on a specially designed flow boiling platform, which includes high speed …
-
Development of optimized core design and analysis methods for high power density BWRs
… the context of Departure from Nucleate Boiling (DNB) and dryout using the two phase interface tracking method was proposed and initial results are presented. It is shown that the twist of the HCF rods promotes detachment of a vapour bubble along the elbows which indicates no possibility for an …
-
Investigation of Non-Linear Chromatographic Retention Behavior for Two Homologous Series of Bis Analytes
… observed. Maximum retention for the bis 3,5-DNB amides is found for the homologues with 5-6 methylene groups in all solvents investigated. In contrast, maximum retention for the bis naproxen amide homologues with 3-8 methylene groups is correlated with the polarity of the mobile phase. Mono …
-
Current profile measurements using MSE on Alcator C-Mod
… rotation of the Diagnostic Neutral Beam (DNB) which significantly reduced the anomalous effect from the secondary beam neutrals during the beam-into-gas calibrations. The new calibration techniques include two plasma calibrations: plasma current sweeping and the plasma size sweeping whose …
-
Application of Optical Fiber Sensors for Quenching Temperature Measurement
… the point of departure from nucleate boiling (DNB) and the minimum film boiling temperature (T<sub>min</sub>) remains difficult to study. This is due to both the complexity of the phenomena, as well as limitations in measurement, where experiments typically utilize thermocouples for temperature …
-
Development of an LCMS Analytical Method with Applicability to Determination of Trace Level Explosives in Environmental Waters
… explosive compounds, in water samples: NB, 1,3-DNB, 1,3,5-TNB, 2,4,6-TNT, 2,4-DNT, RDX, HMX and PETN. A survey of the published articles and writings provides a foundation to the thesis and gives additional background on the researched topic. Some of the proposed methods in the literature have …
-
Development of a general purpose subgrid wall boiling model from improved physical understanding for use in computational fluid dynamics
… area during boiling for possible application in DNB predictions. A statistical tracking method for bubble location on the heated surface provides information on the bubble merging probability and prevents the active nucleation site density from reaching un-physical values. The model was …
-
Improving Detection and Identification Methods for Volatile Organic Explosives
… samples. 2,3-dimethyl-2,3-dinitrobutane (DMDNB), 2,4-dinitrotoluene (DNT), and 1,3-dinitrobenzene (DNB) were identified as the most significant VOCs and subsequently used in the final stage of this project to compare the chemical detection methods with biological detection methods. …
Page 1 of 2