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Recuperación, purificación y caracterización de lipasas producidas por Candida rugosa. Aplicación a la resolución de compuestos quirales y diseño del reactor enzimáticoSánchez Ferrer, Antoni 16 December 1998 (has links)
No description available.
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Control of biogas reactor by LabviewZhiyuan, Xie January 2010 (has links)
In this bachelor thesis we focus on how to controlling different machines that would be used in the Bio-gas production processes. By useing the Labview program, we can do controlling, detecting, data storing and other jobs all together. The whole project is just a blueprint for the following work, as for there are too many components and units that we haven't seen yet. What we have done is to design a program that could be used in reality base on the principle of the whole bio-gas producing processes. Actually we did a quite good job on designing the limited machines that we have in hand, like the Pt-100 unit and the circulation pump are working as well as we had imagined. Hopefully, this thesis and the program I designed can give a direction for the following work on the project, and the most important part--temperature checking and controlling can work well in reality as we expected.
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Flux-limited Diffusion Coefficient Applied to Reactor AnalysisKeller, Steven Ede 09 July 2007 (has links)
A new definition of the diffusion coefficient for use in reactor physics calculations is evaluated in this thesis. It is based on naturally flux-limited diffusion theory (FDT), sometimes referred to as Levermore-Pomraning diffusion theory. Another diffusion coefficient more loosely based on FDT is also evaluated in this thesis. Flux-limited diffusion theory adheres to the physical principle of flux-limiting, which is that the magnitude of neutron current is not allowed to exceed the scalar flux. Because the diffusion coefficients currently used in the nuclear industry are not flux-limited they may violate this principle in regions of large spatial gradients, and because they encompass other assumptions, they are only accurate when used in the types of calculations for which they were intended.
The evaluations were performed using fine-mesh diffusion theory. They are in one spatial dimension and in 47, 4, and 2 energy groups, and were compared against a transport theory benchmark using equivalent energy structures and spatial discretization.
The results show that the flux-limited diffusion coefficient (FD) outperforms the standard diffusion coefficient in calculations of single assemblies with vacuum boundaries, according to flux- and eigenvalue-errors. In single assemblies with reflective boundary conditions, the FD yielded smaller improvements, and tended to improve only the fast-group results. The results also computationally confirm that the FD adheres to flux-limiting, while the standard diffusion coefficient does not.
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Relap5-3d model validation and benchmark exercises for advanced gas cooled reactor applicationMoore, Eugene James Thomas 16 August 2006 (has links)
High-temperature gas-cooled reactors (HTGR) are passively safe, efficient, and
economical solutions to the worldÂs energy crisis. HTGRs are capable of generating high
temperatures during normal operation, introducing design challenges related to material
selection and reactor safety. Understanding heat transfer and fluid flow phenomena
during normal and transient operation of HTGRs is essential to ensure the adequacy of
safety features, such as the reactor cavity cooling system (RCCS). Modeling abilities of
system analysis codes, used to develop an understanding of light water reactor
phenomenology, need to be proven for HTGRs. RELAP5-3D v2.3.6 is used to generate
two reactor plant models for a code-to-code and a code-to-experiment benchmark
problem.
The code-to-code benchmark problem models the Russian VGM reactor for
pressurized and depressurized pressure vessel conditions. Temperature profiles
corresponding to each condition are assigned to the pressure vessel heat structure.
Experiment objectives are to calculate total thermal energy transferred to the RCCS for
both cases. Qualitatively, RELAP5-3DÂs predictions agree closely with those of other
system codes such as MORECA and Thermix. RELAP5-3D predicts that 80% of thermal energy transferred to the RCCS is radiant. Quantitatively, RELAP5-3D computes
slightly higher radiant and convective heat transfer rates than other system analysis
codes. Differences in convective heat transfer rate arise from the type and usage of
convection models. Differences in radiant heat transfer stem from the calculation of
radiation shape factors, also known as view or configuration factors. A MATLAB script
employs a set of radiation shape factor correlations and applies them to the RELAP5-3D
model.
This same script is used to generate radiation shape factors for the code-toexperiment
benchmark problem, which uses the Japanese HTTR reactor to determine
temperature along the outside of the pressure vessel. Despite lacking information on
material properties, emissivities, and initial conditions, RELAP5-3D temperature trend
predictions closely match those of other system codes. Compared to experimental
measurements, however, RELAP5-3D cannot capture fluid behavior above the pressure
vessel. While qualitatively agreeing over the pressure vessel body, RELAP5-3D
predictions diverge from experimental measurements elsewhere. This difference reflects
the limitations of using a system analysis code where computational fluid dynamics codes
are better suited.
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Reactivity Assessment in Subcritical SystemsPersson, Carl-Magnus January 2007 (has links)
<p>Accelerator-driven systems have been proposed for incineration of transuranic elements from spent nuclear fuel. For safe operation of such facilities, a robust method for reactivity monitoring is required. In this thesis, the most important existing reactivity determination methods have been evaluated experimentally in the subcritical YALINA-experiments in Belarus. It is concluded that the existing methods are sufficient for calibration purposes, but not for reactivity monitoring during regular operation of an accelerator-driven system. Conditions for successful utilization of the various methods are presented, based on the experimental experience.</p>
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Nuclear fuel reprocessing plant radioactive airborne effluents sources and treatmentRoles, Gary William January 1978 (has links)
No description available.
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A Continuous Flow Microwave Reactor for Organic SynthesisSauks, Jennifer 27 November 2013 (has links)
Microwave reactors are important tools in chemical synthesis, as they can lead to unprecedented reductions in reaction times and improved reaction yields. In order to scale-up the technology for greater throughput and industrial application, reactor types are moving from batch to continuous flow reactors. This research designed, built, verified and modeled a continuous flow microwave reactor. The reactor could operate under high temperature/high pressure conditions, and was connected to in-line gas chromatography/mass spectrometry, for real time sample analysis.
Specifically, a pressure device was developed to enable the reactor to run under high pressure conditions (< 1100 psi) without the use of a conventional back-pressure device. The reactor design was verified using two chemical reactions, and an in-line analytic apparatus was developed to assess the potential for reactor operation with in-line GC/MS. Additionally, a computational fluid dynamic model was developed to better understand the heat and mass transfer inside the reactor.
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A Continuous Flow Microwave Reactor for Organic SynthesisSauks, Jennifer 27 November 2013 (has links)
Microwave reactors are important tools in chemical synthesis, as they can lead to unprecedented reductions in reaction times and improved reaction yields. In order to scale-up the technology for greater throughput and industrial application, reactor types are moving from batch to continuous flow reactors. This research designed, built, verified and modeled a continuous flow microwave reactor. The reactor could operate under high temperature/high pressure conditions, and was connected to in-line gas chromatography/mass spectrometry, for real time sample analysis.
Specifically, a pressure device was developed to enable the reactor to run under high pressure conditions (< 1100 psi) without the use of a conventional back-pressure device. The reactor design was verified using two chemical reactions, and an in-line analytic apparatus was developed to assess the potential for reactor operation with in-line GC/MS. Additionally, a computational fluid dynamic model was developed to better understand the heat and mass transfer inside the reactor.
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Optimization of breeding performance for metallic Pu-Th, U[superscript]233-Th, U[superscript]233-U[superscript]238 and for (Pu-U)0[subscript]2 fuels in LMFBRsLee, Chung-Chiang Patrick 12 1900 (has links)
No description available.
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Gulping phenomena in transient countercurrent two-phase flowTehrani, Ali A. K. January 2001 (has links)
No description available.
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