Benchmark on neutron capture extracted from (d,p)(d,p) reactions

Direct neutron capture reactions play an important role in nuclear astrophysics and applied physics. Since for most unstable short-lived nuclei it is not possible to measure the $(n, \gamma)$ cross sections, $(d,p)$ reactions have been used as an alternative indirect tool. We analyze simultaneously $^{48}{\rm Ca}(d,p)^{49}{\rm Ca}$ at deuteron energies $2, 13, 19$ and 56 MeV and the thermal $(n,\gamma)$ reaction at 25 meV. We include results for the ground state and the first excited state of $^{49}$Ca. From the low-energy $(d,p)$ reaction, the neutron asymptotic normalization coefficient (ANC) is determined. Using this ANC, we extract the spectroscopic factor (SF) from the higher energy $(d,p)$ data and the $(n, \gamma)$ data. The SF obtained through the 56 MeV $(d,p)$ data are less accurate but consistent with those from the thermal capture. We show that to have a similar dependence on the single particle parameters as in the $(n, \gamma)$, the (d,p) reaction should be measured at 30 MeV.Comment: 5 pg, 4 figs, Phys. Rev. C (rapid) in pres

Brainstem Sources of Cardiac Vagal Tone and Respiratory Sinus Arrhythmia

KEY POINTS: Cardiac vagal tone is a strong predictor of health, although its central origins are unknown. Respiratory‐linked fluctuations in cardiac vagal tone give rise to respiratory sinus arryhthmia (RSA), with maximum tone in the post‐inspiratory phase of respiration. In the present study, we investigated whether respiratory modulation of cardiac vagal tone is intrinsically linked to post‐inspiratory respiratory control using the unanaesthetized working heart‐brainstem preparation of the rat. Abolition of post‐inspiration, achieved by inhibition of the pontine Kolliker‐Fuse nucleus, removed post‐inspiratory peaks in efferent cardiac vagal activity and suppressed RSA, whereas substantial cardiac vagal tone persisted. After transection of the caudal pons, part of the remaining tone was removed by inhibition of nucleus of the solitary tract. We conclude that cardiac vagal tone depends upon at least 3 sites of the pontomedullary brainstem and that a significant proportion arises independently of RSA. ABSTRACT: Cardiac vagal tone is a strong predictor of health, although its central origins are unknown. The rat working heart‐brainstem preparation shows strong cardiac vagal tone and pronounced respiratory sinus arrhythmia. In this preparation, recordings from the cut left cardiac vagal branch showed efferent activity that peaked in post‐inspiration, ∼0.5 s before the cyclic minimum in heart rate (HR). We hypothesized that respiratory modulation of cardiac vagal tone and HR is intrinsically linked to the generation of post‐inspiration. Neurons in the pontine Kölliker‐Fuse nucleus (KF) were inhibited with bilateral microinjections of isoguvacine (50–70 nl, 10 mm) to remove the post‐inspiratory phase of respiration. This also abolished the post‐inspiratory peak of cardiac vagal discharge (and cyclical HR modulation), although a substantial level of activity remained. In separate preparations with intact cardiac vagal branches but sympathetically denervated by thoracic spinal pithing, cardiac chronotropic vagal tone was quantified by HR compared to its final level after systemic atropine (0.5 μm). Bilateral KF inhibition removed 88% of the cyclical fluctuation in HR but, on average, only 52% of the chronotropic vagal tone. Substantial chronotropic vagal tone also remained after transection of the brainstem through the caudal pons. Subsequent bilateral isoguvacine injections into the nucleus of the solitary tract further reduced vagal tone: remaining sources were untraced. We conclude that cardiac vagal tone depends on neurons in at least three sites of the pontomedullary brainstem, and much of it arises independently of respiratory sinus arrhythmia

The Effects of Handedness on Personal Preferences

Lateralization of cerebral function divides the cognitions of the brain between two hemispheres, resulting in differences in thought processing between people based potentially on lateralization. Recent research suggests that these differences in lateralization may render some people more likely to hold certain preferences, attitudes, and beliefs about the world. Individual differences in lateralization can be evaluated with simple inventories measuring handedness. With this in mind, the following study attempted to determine if differences in handedness could be associated with differences in personal preferences, particularly in regards to types of food and forms of entertainment. It evaluated participants by using the Edinburgh Handedness Inventory (Oldfield, 1971) to create groups of inconsistent-handers and consistent-handers, then surveyed them on questionnaires of food preferences and entertainment preferences, comparing the responses between the two groups. The results for this study showed no significant differences between the responses provided by inconsistent-handers and consistent-handers. Thus, no definitive conclusions could be drawn from this research. While self-report surveys may be effective measures on this topic, the surveys used here may not be reflective of the participants’ actual behaviors, and therefore the results of this study may not reflect the research question accurately

Jesuit Winemaking and Art Production in Northern New Spain

This article presents new research on Jesuit visual culture in northern New Spain, situating Santa María de las Parras (founded 1598) as an important site where the Jesuits and secular landowners became involved in the lucrative business of winemaking. Viticulture in Parras helped transform this mission settlement into a thriving center of consumption. The Jesuits fostered alliances with Spanish and Tlaxcalan Indians to serve their religious and temporal interests, as these patrons donated funds to decorate chapels in the Jesuit church of San Ignacio. This financial support allowed the Society to purchase paintings by prominent artists in Mexico City and import them to Parras. The Jesuits arranged their chapels in a carefully ordered sequencing of images that promoted Ignatian spirituality and echoed iconographic decoration programs in Mexico City and Rome

National security policy constraints on technological innovation: A case study of the Invention Secrecy Act of 1951

Recent studies indicate that the United States is trailing other countries in technological innovation and competitiveness. This case study examined national security policy constraints on technological innovation, specifically the Invention Secrecy Act. It focused on the social constructs of collaboration and interdisciplinary knowledge in the aerospace industry. The methodology included historical research, data collection, and semi-structured interviews with experts from academia, general industry, government and public policy, aerospace/defense industry, and federal government. The results of the study suggested that since World War II, national security policies have not been clearly and consistently defined, interpreted, or implemented. This lack of clarity gave rise to actions by presidential administrations and federal agencies, creating a fractious atmosphere and further limiting access to and sharing of restricted or classified information by academia, industry, government, and private researchers. Government actions also directed funding allocations to specific research types or groups, which added to the veil of secrecy and selectiveness surrounding national security projects. Collectively, the actions constrained collaboration and interdisciplinary exchange of knowledge; two essential sources for technological innovation. This study identified five critical factors that likely impede technological innovation in America’s aerospace industry: (a) power, control, and responsibility for national security, (b) the assumption that technological supremacy equals a secure nation, (c) policy constraints: the Invention Secrecy Act and Export Control Regulations, (d) funding constraints, and (e) organizational culture and ethnocentrism. Recommendations for future studies include explore and identify additional constraints on innovation by other national security policies, investigate and assess the impact of these restrictive policies on specific industries, and examine organizational culture as a barrier to technological innovation

You turn me cold: evidence for temperature contagion

Introduction During social interactions, our own physiological responses influence those of others. Synchronization of physiological (and behavioural) responses can facilitate emotional understanding and group coherence through inter-subjectivity. Here we investigate if observing cues indicating a change in another's body temperature results in a corresponding temperature change in the observer. Methods Thirty-six healthy participants (age; 22.9±3.1 yrs) each observed, then rated, eight purpose-made videos (3 min duration) that depicted actors with either their right or left hand in visibly warm (warm videos) or cold water (cold videos). Four control videos with the actors' hand in front of the water were also shown. Temperature of participant observers' right and left hands was concurrently measured using a thermistor within a Wheatstone bridge with a theoretical temperature sensitivity of <0.0001°C. Temperature data were analysed in a repeated measures ANOVA (temperature × actor's hand × observer's hand). Results Participants rated the videos showing hands immersed in cold water as being significantly cooler than hands immersed in warm water, F(1,34) = 256.67, p0.1). There was however no evidence of left-right mirroring of these temperature effects p>0.1). Sensitivity to temperature contagion was also predicted by inter-individual differences in self-report empathy. Conclusions We illustrate physiological contagion of temperature in healthy individuals, suggesting that empathetic understanding for primary low-level physiological challenges (as well as more complex emotions) are grounded in somatic simulation

Correspondence from Earnhardt Deming Inc. to United Irrigation Company

Letter printed on stationary with images of buildings belonging to Earnhardt Deming Inc. and a home owned by Mr. Earnhardt. The company is inquiring on taxes owed on Lot 32-11.https://scholarworks.utrgv.edu/johnshary/1060/thumbnail.jp