[en] The Yucca Flat-Climax Mine Corrective Action Unit (CAU) on the Nevada Test Site comprises 747 underground nuclear detonations, all but three of which were conducted in alluvial, volcanic, and carbonate rocks in Yucca Flat. The remaining three tests were conducted in the very different hydrogeologic setting of the Climax Mine granite stock located in Area 15 at the northern end of Yucca Flat. As part of the Corrective Action Investigation (CAI) for the Yucca Flat-Climax Mine CAU, models of groundwater flow and radionuclide transport will be developed for Yucca Flat. However, two aspects of these CAU-scale models require focused modeling at the northern end of Yucca Flat beyond the capability of these large models. First, boundary conditions and boundary flows along the northern reaches of the Yucca Flat-Climax Mine CAU require evaluation to a higher level of detail than the CAU-scale Yucca Flat model can efficiently provide. Second, radionuclide fluxes from the Climax tests require analysis of flow and transport in fractured granite, a unique hydrologic environment as compared to Yucca Flat proper. This report describes the Climax Mine sub-CAU modeling studies conducted to address these issues, with the results providing a direct feed into the CAI for the Yucca Flat-Climax Mine CAU. Three underground nuclear detonations were conducted for weapons effects testing in the Climax stock between 1962 and 1966: Hard Hat, Pile Driver, and Tiny Tot. Though there is uncertainty regarding the position of the water table in the stock, it is likely that all three tests were conducted in the unsaturated zone. In the early 1980s, the Spent Fuel Test-Climax (SFT-C) was constructed to evaluate the feasibility of retrievable, deep geologic storage of commercial nuclear reactor wastes. Detailed mapping of fractures and faults carried out for the SFT-C studies greatly expanded earlier data sets collected in association with the nuclear tests and provided invaluable information for subsequent modeling studies at Climax. The objectives of the Climax Mine sub-CAU work are to (1) provide simulated heads and groundwater flows for the northern boundaries of the Yucca Flat-Climax Mine CAU model, while incorporating alternative conceptualizations of the hydrogeologic system with their associated uncertainty, and (2) provide radionuclide fluxes from the three tests in the Climax stock using modeling techniques that account for groundwater flow in fractured granite. Meeting these two objectives required two different model scales. The northern boundary groundwater fluxes were addressed using the Death Valley Regional Flow System (DVRFS) model (Belcher, 2004) developed by the U.S. Geological Survey as a modeling framework, with refined hydrostratigraphy in a zone north of Yucca Flat and including Climax stock. Radionuclide transport was simulated using a separate model confined to the granite stock itself, but linked to regional groundwater flow through boundary conditions and calibration targets

[en] Nuclear fusion yields for the secondary reaction D+D have been measured for carbon-atom anions and carbon-cluster anions incident on a deuterated polyethylene target for atom and cluster energies up to 324 keV. Comparison of the cluster- and atom-anion fusion yields per carbon at the same bombarding energy per carbon show no evidence of a collective enhancement for clusters as large as C₁₉. The absolute yields can be reproduced by a knock-on model. An upper limit to the fusion yield for C₇D₇SO₃^- bombardment has also been determined

[en] The ground state rotational band populations for the 4n evaporation channel have been measured at three ¹⁶O bombarding energies. The populations for the ⁴He+¹⁶⁶Er reaction, which populates the same residual nucleus at above-barrier energies, have also been measured to calibrate the statistical model which has been used to relate the observed populations to the compound nuclear spin distribution. The mean compound nuclear angular momenta are somewhat less than obtained in a previous gamma ray multiplicity investigation and are in better agreement with coupled channels calculations

[en] With the increasing need for higher accuracy measurement in computer vision, the precision of camera calibration is a more important factor. The objective of stereo camera calibration is to estimate the intrinsic and extrinsic parameters of each camera. We presented a high-accurate technique to calibrate binocular stereo vision system having been mounted the locations and attitudes, which was realized by combining nonlinear optimization method with accurate calibration points. The calibration points with accurate coordinates, were formed by an infrared LED moved with three-dimensional coordinate measurement machine, which can ensure indeterminacy of measurement is 1/30000. By using bilinear interpolation square-gray weighted centroid location algorithm, the imaging centers of the calibration points can be accurately determined. The accuracy of the calibration is measured in terms of the accuracy in the reconstructing calibration points through triangulation, the mean distance between reconstructing point and given calibration point is 0.039mm. The technique can satisfy the goals of measurement and camera accurate calibration

[en] The hydraulic efficiency of a low specific speed centrifugal pump is low because of the long and narrow meridian flow passage, and the severe disk friction. Spanwise slotted blade flow control technology has been applied to the low specific speed centrifugal pump. This paper concluded that spanwise slotted blades can improve the pump performance in both experiments and simulations. In order to study the influence to the impeller and volute by spanwise slotted blade, impeller efficiency and volute efficiency were defined. The minimum volute efficiency and the maximum pump efficiency appear at the same time in the design flow condition in the unsteady simulation. The mechanism of spanwise slotted blade flow control technology should be researched furthermore

[en] The fission cross sections for ³²S+¹³⁸Ba and ⁴⁸Ti+¹²²Sn in the regoin of the fusion barrier have been measured. These results are combined with evaporation residue cross sections from another measurement to obtain the total fusion excitation functions for these systems at energies near and below the barrier. Coupled channels calculations easily reproduce the experimental results

[en] Short communication. 7 refs, 1 fig

[en] In order to explore the possibility that previously observed anomalous mean angular momenta are related to the mass asymmetry of the entrance channel, we have studied three systems, ²⁸Si + ¹⁴²Ce, ³²S + ¹³⁸Ba, and ⁴⁸Ti + ¹²²Sn, all of which lead to the same compound nucleus, ¹⁷⁰Hf. Gamma ray multiplicities for fusion have been determined using an electrostatic deflector and time of flight to identify the evaporation residues. Results have been obtained for bombarding energies from approximately 20% above the Coulomb barrier down to nearly 10% below the barrier. The mean angular momenta deduced from the gamma ray multiplicities are generally well reproduced by coupled channels calculations employing known deformation parameters and an estimate of the transfer strength and do not show any evidence of an unexpected effect related to the mass asymmetry of the entrance channel

[en] Resveratrol (Res), a stilbenic compound, recently has become the focus of a number of studies in medicine and plant physiology, and Saccharomyces cerevisiae (S. cerevisiae) has become a popular host for production of non-native compounds. As the last and key enzyme of the biosynthesis pathway, the amount and expression level of Resveratrol Synthase (RS) positive correlation on the production of Res. In this study, a signal peptide sequence, secreted by a-factor of S. cerevisiae, was connected with the RS gene, resulting a pYCa secretory plasmid construction. The RS gene was secretory expressed in S. cerevisiae successfully. Subsequently, a white wine fermentation was carried out by the recombinant strain. The Res concentration of the white wine fermented by the recombinant strain was 36% higher than the control. This has great interests for establishing a controllable way to produce RS and lays the foundation for exploring the Res biosynthesis method. (author)

[en] Suspensions of nanoparticles of silicon dioxide in polyethylsiloxane liquid used in engineering as greases and instrument oils have been synthesized. The effective viscosity of nanosuspensions depending on the shear stress was determined by the acoustic resonance method using a piezoelectric quartz resonator. An increase in the strength of the structure of nanosuspensions due to the formation of a supramolecular structure has been shown. (paper)