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Showing 1 to 20 of 175 for “"Subcritical"”.
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Nanoscale thermal systems in subcritical region
The behavior of a nanoscale fluid system in the subcritical region is investigated using molecular simulation. The fluid used is argon and the intermolecular forces are represented by the Lennard-Jones potential. The simulations show that the phase change in a nanoscale system becomes continuous as …
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Subcritical crack growth in polysilicon MEMS
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Subcritical crack growth in zirconium alloys
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1982.
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Development of Green Subcritical Water Separation Technology
… conditions below its critical point is called subcritical water. However, the term “subcritical water” normally refers to hot water up to 374 C and pressure up to 218 atm. As the temperature increases, the hydrogen bonding between water molecules weakens, making water less polar at elevated …
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Subcritical time-dependent response of Berea sandstone
… of this study can be used for the assessment of subcritical behavior of rock under different drainage conditions.
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Mechanics and subcritical cracking of FRP-concrete interface
… growth process is known as environment-assisted subcritical cracking. A series of subcritical cracking testing are conducted using a wedge-driven testing to gain the ability to accurately predict the long-term durability of the FRP-concrete interface. It has been found that water, deicing salt …
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The design and construction of a subcritical nuclear reactor
A subcritical heterogeneous nuclear reactor was designed and constructed for use in the nuclear engineering program at Virginia Polytechnic Institute. Natural uranium fuel and reactor grade graphite were used as building materials. Considering that no two samples of moderator have the same …
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Internal hydrogen-induced subcritical crack growth in stainless steels
Three types of stainless steel--austenitic, ferritic and duplex--were cathodically precharged with hydrogen at high temperature in a molten salt electrolyte. Constant strain rate tests and sustained load tests were performed in air at temperatures from 0 to 50$\sp\circ$C with hydrogen contents up …
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Mechanisms of Environment Induced Subcritical Flaw Growth in Aisi 4340 Steel
Made available in DSpace on 2014-12-10T17:25:39Z (GMT). No. of bitstreams: 1 6706761.pdf: 1573786 bytes, checksum: 8311a797ea24966301f0e510f131e789 (MD5) Previous issue date: 1966
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Limits on subcritical reactivity determination using rossi-alpha and related methods
The subcritical reactivity, ρ, of a neutron multiplying system is of interest to many factions of the nuclear community. The subcritical reactivity in a nuclear system can be inferred from measurements of the prompt neutron decay constant, α. Near critical, the reactivity is linearly proportional …
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Extended Momentum Model for Single and Multiple Hydrokinetic Turbines in Subcritical Flows
… are thus updated iteratively to adapt the DMS to subcritical applications. The DMS is corrected further to account for the energy losses due to mechanical struts and turbine shaft, flow curvature, turbine depth, and streamtube expansion. Sub-models from the literature are partly corrected to …
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Catalytic Production of Furfural by the Subcritical Hydrothermal Gasification of Flax Straw
… catalyst. This study focused on the catalytic subcritical hydrothermal gasification of flax straw. The study was performed using a 600 mL autoclave batch reactor using flax straw with a fixed weight (10 g) in all the experimental runs. Three types of solid acid catalysts were explored in this …
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Fundamental solubility study of polycyclic aromatic hydrocarbons in subcritical water and ethanol mixtures
… data, however, has limited the development of subcritical water technologies. Hence, solubility studies are essential to quantify the solvating power of subcritical water and to determine the thermodynamic limit of a process. A static analytical equilibrium method was used to measure the binary …
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Micromechanics of Hydrogen-Induced Crack Initiation in Pipeline Steels and Subcritical Crack Growth
To further explore the influence of hydrogen on ductile fracture, we model sustained-load cracking in the iron-base superalloy 1N903 at hydrogen pressures at which fracture is governed by plasticity. Through a micromechanics analysis, we quantify the void growth dependence on stress triaxiality and …
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Precipitation of ultrafine particles using liquid antisolvent with concentric ultrasonic nozzle and subcritical CO2
… using ultrasonic nozzle and other process using subcritical CO_2 have been used to produce ultrafine particles of this drug. In liquid antisolvent precipitation, a combination of ultrasound, polymer and surfactant is used to precipitate ultrafine particles. Ultrasound is used to increase the …
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Use of a moments method for the analysis of flux distributions in subcritical assemblies.
Massachusetts Institute of Technology. Dept. of Nuclear Engineering. Thesis. 1968. Ph.D.
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Use of neutron absorbers for the experimental determination of lattice parameters in subcritical assemblies.
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1966.
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Numerical analysis of subcritical open channel flow by the penalty function finite element method
Many free surface flow problems encountered in hydraulic engineering can be accurately analyzed by utilizing the depth-averaged equations of motion. A consequence of adopting this depth-averaged modeling approach is that closure approximations must be implemented to represent the so-called …
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Measurement of unsteady forces on a circular cylinder in cross flow at subcritical Reynolds numbers
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1983.
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The design, construction, and calibration of a flexible control rod for the V.P.I. subcritical reactor
… of installing a control rod in the V. P. I. subcritical reactor is complicated by the limiting two foot clearance between the top of the reactor and the ceiling. Within this space it is necessary to insert and operate an effective seven foot, solid, straight rod along the vertical axis of the …
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