Trapping of Bose-Einstein condensates in a three-dimensional dark focus generated by conical refraction

We present a novel type of three-dimensional dark focus optical trapping potential for ultra-cold atoms and Bose-Einstein condensates. This 'optical bottle' is created with blue-detuned laser light exploiting the phenomenon of conical refraction occurring in biaxial crystals. We present experiments on confining a Rb87 Bose-Einstein condensate in this potential and derive the trapping frequencies and potential barriers under the harmonic approximation and the conical refraction theory

Capillary Liquid Acquisition Device Heat Entrapment

Cryogenic liquid acquisition devices (LADs) for space-based propulsion interface directly with the feed system, which can be a significant heat leak source. Further, the accumulation of thermal energy within LAD channels can lead to the loss of subcooled propellant conditions and result in feed system cavitation during propellant outflow. Therefore, the fundamental question addressed by this program was: To what degree is natural convection in a cryogenic liquid constrained by the capillary screen meshes envisioned for LADs? Testing was first conducted with water as the test fluid, followed by LN2 tests. In either case, the basic experimental approach was to heat the bottom of a cylindrical column of test fluid to establish stratification patterns measured by temperature sensors located above and below a horizontal screen barrier position. Experimentation was performed without barriers, with screens, and with a solid barrier. The two screen meshes tested were those typically used by LAD designers, 200x1400 and 325x2300, both with Twill Dutch Weave. Upon consideration of both the water and LN2 data, it was concluded that heat transfer across the screen meshes was dependent upon barrier thermal conductivity and that the capillary screen meshes were impervious to natural convection currents

Reverse Shock Emission Revealed in Early Photometry in the Candidate Short GRB 180418A

We present observations of the possible short GRB 180418A in $\gamma$-rays, X-rays, and in the optical. Early optical photometry with the TAROT and RATIR instruments show a bright peak ($\approx$ 14.2 AB mag) between $T+28$ and $T+90$ seconds that we interpret as the signature of a reversal shock. Later observations can be modeled by a standard forward shock model and show no evidence of jet break, allowing us to constrain the jet collimation to $\theta_j> 7^\circ$. Using deep late-time optical observations we place an upper limit of $r>24$ AB mag on any underlying host galaxy. The detection of the afterglow in the \textit{Swift} UV filters constrains the GRB redshift to $z<1.3$ and places an upper bound on the $\gamma$-ray isotropic equivalent energy $E_{\rm{\gamma,iso}} < 3 \times 10^{51}$ erg. The properties of this GRB (e.g. duration, hardness ratio, energetic, and environment) lie at the intersection between short and long bursts, and we can not conclusively identify its type. We estimate that the probability that it is drawn from the population of short GRBs is 10\%-30\%.Comment: Accepted por publication in Ap

Attitudes and preferences towards self-help treatments for depression in comparison to psychotherapy and antidepressant medication

Background: Self-help is an effective treatment for depression. Less is known, however, about how acceptable people find different self-help treatments for depression. Aims: To investigate preferences and attitudes toward different self-help treatments for depression in comparison to psychotherapy and antidepressants. Method:N = 536 people who were not actively seeking treatment for depression were randomly assigned to read about one of five treatment options (bibliotherapy, Internet-based self-help, guided self-help, antidepressants, or psychotherapy) before rating how acceptable they found the treatment. Participants also ranked the treatments in order of preference. Results: Psychotherapy and guided self-help were found to be the most acceptable and preferred treatment options. Antidepressants and bibliotherapy were found to be the least acceptable treatments, with antidepressants rated as the most likely to have side effects. Preference data reflected the above findings – psychotherapy and guided self-help were the most preferred treatment options. Conclusions: The findings highlight differences in attitudes and preferences between guided and unguided self-help interventions; and between self-help interventions and psychotherapy. Future research should focus on understanding why unguided self-help interventions are deemed to be less acceptable than guided self-help interventions for treating depression

Mothers of Soldiers in Wartime: A National News Narrative

National news media represent mothers of US combat soldiers in the Iraq War as archetypal good mothers, that is, mothers who continue their maternal work even after their children are deployed. However, not all mothers are depicted as the archetypal patriotic mother, i.e., a good mother who is also stoic and silent about the war and her child\u27s role in it. Mothers of soldiers are portrayed as good mothers who sometimes also voice their attitudes about the war effort. The maternal attitudes ranged from complete support for the war to opposition to the war but support for the soldiers. The findings suggest a picture of wartime motherhood that is more nuanced than the historical image of the patriotic mother suggests

Psychometric Testing of the Presence of Nursing Scale: Measurability of Patient Perceptions of Nursing Presence Capability of Nurses in an Academic Medical Center

Introduction: Nursing presence occurs when nurses expend themselves on the behalf of a unique patient. This phenomenon requires further research to develop instruments. The Presence of Nursing Scale (PONS) measures the patient’s perspective (Kostovich, 2012). Psychometric testing of PONS-Revised using exploratory factor analysis is warranted to further develop a reliable and valid measure of nursing presence. Contextual workplace variables need exploration in inpatient settings for correlation with nursing presence. Method(s): A convenience sample of 122 adult inpatients from ten acute-care nursing units in a Southeastern Magnet hospital were surveyed to conduct the first psychometric testing of this revised instrument using exploratory factor analyses. Seven research questions evaluated potential correlations between the PONS-R, patient satisfaction using nurse-sensitive measures of HCAHPS, nursing unit-specific workforce factors and patient demographic factors. Results: PONS-R demonstrated high internal consistency reliability (r = .974), test-retest reliability (statistically significant at the .01 level) and divergent validity (p=.002). PONS-R compared to nurse HCAHPS measures was statistically significant at the .01 level, (r = .736). EFA revealed one factor (eigenvalues over 1), with a weak secondary factor centered on intimacy factors suggesting addition of items and repeated study with a larger sample size to further psychometrically develop the instrument. Unexpected negative correlations were found with unit-workforce factors including average RN experience level (r= -.185, significant at the .05 level), and average RN age (r = - .218). An unexpected positive correlation was found - percentage of Associate degree nurses (r = .269, statistically significant at the .05 level. The Triangle region was correlated with a higher PONS-R score (p = .038; n=4), otherwise no statistically significant correlations were found for PONS-R and patient demographics nor patient-specific variables such as estimated number of RN providing care, nor length of stay on the unit. Discussion & Conclusions: Further psychometric testing is indicated with larger samples and perhaps with the inclusion of intimacy factor items. Additional correlational studies focused on other patient quality outcomes measures with expansion of nurse demographics is indicated to explore for confounding variables

Water Conservation in Industrial Filtration Operations

The washing of a solute from filter cakes was investigated for both saturated and unsaturated washing conditions. Systems used in this experimental study were 0.065 NaCl solution as the filtrate in an aluminum hydrate filter cake and 0.1 Normal HCL solution as the filtrate in a column packed with glass beads. The filtrate concentration as a function of the flow rate of wash water and of the volume of effluent from the packed bed was measured. The amounts of filtrate removed from the bed during saturated washing, and washing employing repetitive steps of saturation followed by evacuation were compared. Also, the amounts of wash water required to lower the filtrate concentration to essentially zero were contrasted. It was determined that the saturated wash condition was more efficient in removing the filtrate from compressible cakes, while the reverse was true for porous, incompressible cakes. Computer programs were developed to simulate both saturated and unsaturated washing conditions