[en] The indicated numerical values and curves refer to an isolated system of uranylnitrate (UO₂(NO₃)₂) (100% uranium 235) homogenously distributed in light water (H₂O) with maximum reflection by light water. Maximum reflection is obtained by an at least 30 cm thick water layer with a density of 1 g/cm³. (orig.)

[en] The experiment of critical heat flux was conducted in a tube of inner diameter of 7.95 mm and heating length of 0.8 m with water flowing upward, covering the ranges of pressure of 8.6 - 20.9 MPa, mass flux of 447 - 1179 kg/m"2s, outlet subcooling of 1 - 96 K and critical heat flux of 0.69 - 3.68 MW/m"2. The CHF characteristics and parametric trends are studied, and the experimental results are compared with the predictions of 96 CHF Look-up Table. (author)

[en] In the mid-1970s and early 1980s, almost 100 critical and approach-to-critical experiments using water-moderated plutonium metal arrays were performed at the Rocky Flats Critical Mass Laboratory. The experiments were performed in two programs: 2x2xN arrays conducted in the 1970s and 3x3x3 arrays conducted in the 1980s. Both sets of experiments used the same double-canned plutonium parts and were water moderated. The major differences between the two programs were the support structure and tank and the administrative limits on criticality. This paper summarizes the critical data and results of both sets of experiments. These experiments are then analyzed in a companion paper

[en] Highlights: • Critical properties of three dicarboxylic acid diethyl esters were measured. • These compounds are thermally unstable at their critical points. • Pulse-heating method with ultra-low residence times was used. • Recommended values of critical properties of diethyl ethanedioate to diethyl decanedioate were determined. The critical temperatures and pressures of diethyl esters of straight-chain saturated dicarboxylic acids C₂H₅OOC(CH₂)_n−2COOC₂H₅ with n = 5, 8, 10 have been measured. The data of this work and the results of the previous measurements have been analyzed and the recommended critical temperatures and pressures of diethyl esters from diethyl ethanedioate to diethyl decanedioate have been given. The internal consistency of the experimental data has been tested by considering the plot ${(M/p_c)}^{1/2}$ versus n, where M is the molar mass, $p_c$ is the critical pressure. The acentric factors of dicarboxylic acid diethyl esters have been calculated.

[en] The tightened fuel rod pitch will be adopted in the design of fuel assembly for a Super-critical water Cooled Power Reactor (SCPR). In order to clarify the heat transfer of supercritical fluid flowing in a small diameter tube, experiment was carried out with a smooth tube of 4.4 mm ID in which HCFC-22 fluid at a supercritical pressure flows vertically upward and, experimental data were compared with those in larger diameter tubes. (author)

[en] The critical current J_c of superfluid ³He-B through 0.8-μm-diam channels has been measured. For small currents the pressure difference ΔP = 0 along the flow channels within the resolution, implying small or zero dissipation. ΔP grows rapidly with increasing current above J_c; a clear transition to dissipative flow is thus observed. The temperature dependence of J_c indicates that the superfluid density and the critical temperature are reduced inside the narrow flow channels

[en] The magnetizations of cylinder Bi_1.7Pb_0.3Sr₂Ca₂Cu₃O_y bulk superconductor whose length is shorten step by step has shown that H_c1 is independent of the length of cylinder, i.e. independent of the demagnetic factor, as the length is larger than the diameter, whereas it is dependent of demagnetic factor, as the length is smaller than the diameter. But the demagnetization factor is a constant about 1/4 for l< d

[en] As part of the research into nuclear measurement techniques, a series of measurements was performed that have applications to criticality safety and nuclear material handling. The critical mass of a set of bare, enriched-uranium metal hemispherical shells, known as the Rocky Flats shells, was measured for an assembly having an inside radius of 2.347 cm. The critical mass value was extrapolated from a series of subcritical measurements using three different kinds of sources (AmBe, AmF, and ²⁵²Cf) placed at the center of the shells. Two kinds of neutron detection configurations (a 1% efficiency and a 25% efficiency configuration) were used to make the measurements

[en] The upper critical field H_c2 of the random percolating superconductor InGe has been measured as a function of the metal volume fraction x. Near the percolation threshold x_c, H_c2 diverges with a critical exponent which is significantly smaller than that of the normal-state resistivity. An interpretation of this behavior is proposed in terms of the properties of the infinite cluster

[en] A method for determining metal density at the critical point is presented. The density, rhosub(c), of tungsten and molybdenum at the critical point and the energy required for the transition of these metals from the normal state to the critical state, Wsub(c), were measured and found to be rhosub(c) = (6 + - 0.5) g cm^-3 and Wsub(c) = (4.4 + - 0.2) kJ g^-1 for tungsten; rhosub(c) = (3.5 + -0.3) g cm^-3 and Wsub(c) = (6.9 + - 0.2) kJ g^-1 for molybdenum. (author)