Separation of Americium from Europium using Camphor-BisTriazinyl Pyridine: A Fundamental Study

Among the different components present in spent nuclear fuel, long-lived trivalent actinides are particularly difficult to separate from the shorter-lived lanthanide fission products due to their similar chemical properties. Selective extraction of americium from acidic solution (up to 2M HNO₃) containing tenth molar quantities of lanthanides has been achieved using neutral pyridine-based ligands dissolved in polar diluents. Nitrogen-based Bis Triazinyl Pyridine (BTP) ligands are desirable for both their excellent An/Ln selectivity and incinerability. Results pertaining to ligand solubility, kinetics, hydrolytic stability, and extraction performance in various nitric acid environments are presented.     

Hemodynamic responses to stellate ganglion stimulation in mongrels and greyhounds

A comparison of the effects of left stellate ganglion stimulation (SGS) on central and aortic hemodynamics has been made in chloralose-anesthetized mongrel (M), and greyhound (GH) dogs. Measurements of aortic pressure and flow, and left ventricular pressure were made during stimulation of the decentralized left SG at different frequencies from 0 to 20 Hz. The increases in aortic pressure and flow with SGS were larger in the GH, especially for low frequencies of stimulation. Stroke volume was increased with SGS in the GH at all stimulation rates, whereas in the M it was unchanged. A greater decrease in left ventricular end-diastolic pressure with SGS was found in the GH. These results suggest that differences exist in both the intrinsic and extrinsic control of cardiac output in the greyhound dog compared to the mongrel. These differences may be in part responsible for the elevated arterial blood pressure in the greyhound compared to the mongrel.     

Voltage Dip Protection with DC Motorstarter Coils

Continuous process plants are being designed today with fewer and larger components arranged in ``single train' configurations. Maintaining operating continuity with fewer components requires high equipment reliability. Motor controls for larger components are using magnetic contactors equipped with automatic undervoltage reclosing. A voltage dip where contactors drop open and reclose can be very serious because of the nature of motors and their driven loads during voltage transients. The reclosing of magnetic starters on motors with a decaying internal voltage is reviewed. A method of riding through voltage dips with dc coil magnetic contactors is described. Application of this method will depend upon the individual characteristics of each electrical system and the process that it serves.     

A scattering matrix-based beamformer for wide-angle scanning in hybrid antennas

This paper presents a new approach to beamforming in hybrid antennas. Using a scattering matrix model for the hybrid antenna system, a bidirectional transformation is developed that relates the signals at the hybrid system feed to the signals that would be present in a planar array at the location of the reflector aperture. For example, the received fields at the feed of a hybrid antenna system may be transformed into the fields at the reflector aperture, and these reflector aperture fields may then be processed as if they were received by a planar or linear array. Similarly, the desired field or current distribution across the reflector aperture when transmitting may be transformed into the required field or current distribution at the hybrid system feed. This method allows standard linear or planar array analysis and synthesis techniques to be used with the hybrid system. Examples are provided for transmit and receive weight synthesis.     

Expansion of transplanted hepatocytes during liver regeneration

A method for volume selective proton spectroscopy is presented based on a multiecho sequence with short refocusing interval tcp. It is demonstrated, that by appropriate choice of tcp on the order of 4-6 ms, signals from overlapping multiplets like the glutamine and glutamate (Glu/Gln) resonances in spectra of the human brain are considerably increased compared with a conventional PRESS volume selection scheme. Thus proton spectra from J-coupled multiplet signals can be acquired with TE on the order of 20-30 ms avoiding the baseline problems arising at shorter echo times due to broad resonances. This allows to selectively acquire spectra from substances with longer T2 without the confounding effects from J-coupling occurring in conventional volume selection techniques.     

Minimizing the effects of voltage disturbances on continuousindustrial processes

The continuous industrial process considered to be within the scope of this paper is defined. Typical process plant reaction to power interruptions and voltage sags is described and the characteristics of the voltage sags experienced by continuous process plants are discussed. The reaction of process and motor control components is described. Methods of minimizing the adverse reaction to voltage disturbances by manipulation or the control component circuit configuration and/or manipulation of the control power supply are presented     

Effects of discrete emotions on young children's ability to discern fantasy and reality.

This study examined 3- to 5-year-olds' (N = 128; 54% girls) ability to discriminate emotional fantasy and reality. Children viewed images depicting fantastic or real events that elicited several emotions, reported whether each event could occur, and rated their emotional reaction to the image. Children were also administered the Play Behavior Questionnaire and Pretend Action Tasks to assess play behaviors. Findings revealed age-related improvements in performance and biases in judgment based on the emotion depicted. Children reported that happy fantastic events could occur significantly more often than frightening and angry fantastic events and that happy real events could occur significantly more often than frightening and angry real events. Children's emotional reactions to the images but not play behaviors were significantly related to their fantasy-reality distinctions. Implications for the relation between emotions and children's fantasy-reality distinctions are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Pre-rigor temperature and the relationship between lamb tenderisation,free water production,bound water and dry matter

The M. longissimus from lambs electrically stimulated at 15 min post-mortem were removed after grading, wrapped in polythene film and held at 4 (n = 6), 7 (n = 6), 15 (n = 6, n = 8) and 35 °C (n = 6), until rigor mortis then aged at 15 °C for 0, 4, 24 and 72 h post-rigor. Centrifuged free water increased exponentially, and bound water, dry matter and shear force decreased exponentially over time. Decreases in shear force and increases in free water were closely related (r² = 0.52) and were unaffected by pre-rigor temperatures.     

A limit on retrieval-induced forgetting.

Retrieving some members of a memory set impairs later recall of semantically related but not unrelated members (M. C. Anderson, R. A. Bjork, & E. L. Bjork, 1994; M. C. Anderson & B. A. Spellman, 1995). The authors investigated whether this retrieval-induced forgetting effect would generalize to testing procedures other than category-cued recall. Although the authors demonstrated a retrieval-induced forgetting effect using a category-cued recall task, they failed to show retrieval-induced forgetting on several different memory tests that used item-specific cues, including a category-plus-stem-cued recall test, a category-plus-fragment-cued recall test, a fragment-cued recall test, and a fragment completion task. (PsycINFO Database Record (c) 2010 APA, all rights reserved)