Development of detonation reaction engine

Reaction engine operates on the principle of a controlled condensed detonation. In this engine the gas products that are expelled from the engine to produce thrust are generated by the condensed detonation reaction. The engine is constructed of two basic sections consisting of a detonation wave generator section and a condensed detonation reaction section

Continuous detonation reaction engine

Reaction engine operates on the principles of a controlled condensed detonation rather than on the principles of gas expansion. The detonation results in reaction products that are expelled at a much higher velocity

Forward Myth: Military Public Relations and the Domestic Base Newspaper 1941-1981

This dissertation explores the evolution of domestic military base newspapers from 1941-1981, a timeframe that encapsulates the Second World War, Korean War, and Vietnam War, as well as interwar and postwar years. While called “newspapers,” the United States military designed these publications to be a hybrid of traditional news and public relations. This dissertation focuses on three primary aspects of these newspapers: the evolution of the format, style, and function of these papers; the messages editors and writers crafted for and about the “common” soldier and American; and the messages for and about members of the non-majority group. Sometimes printed on private presses with ad revenue generated by civilian newspaper ad sellers, these papers sometimes marked a unique marriage between the military and traditional media outlets. However, the local presses had no control over content. That privilege went to each base’s commanding officer. Despite the wide swath of people with control over content, these papers looked the same, and in some cases carried shared stories from various government-run “news” agencies. On their pages could be found both news of the day and identity building stories and editorials, all of which conspired to inform and to a greater or lesser degree nudge readers to conclusions of what the creators of the papers thought it meant to be an American, a soldier, or the member of a racial or gender minority. Though tasked with functioning as both a journalistic and public relations vessel, these publications were inconsistent as purveyors of both news and propaganda. However, each provides a wealth of knowledge about the development of the American identity, and dominant concepts of majority and minority, as well as the integration of public relations and journalism into the military in the 20th Century

DOPRINOSI NEUROKIRURGIJI SAMUELA D. GROSSA

One of the most famous American Surgeons of the early 1800s was Samuel David Gross (1805-1884). His mastery of surgery was immortalized in Thomas Eakins’ 1875 painting of Gross titled The Gross Clinic. Gross was a prolific surgeon and one of his textbooks, a System of Surgery, went through 6 editions. Not known to many is the fact that this book also covered neurosurgical diseases and techniques. Gross was a skilled surgeon and able writer. His textbooks on surgery were well received in his day. Moreover, he should be considered an early pioneer of neurosurgery as his System of Surgery is filled with neurosurgical diagnoses and neurosurgical techniques.Samuel David Gross (1805.–1884.) bio je jedan od najpoznatijih američkih kirurga prvog dijela 19. stoljeća. Njegova kirurška vještina stekla je besmrtnost u Grossovoj slici Thomasa Eakinsa iz 1875. naslovljenoj Grossova klinika (The Gross Clinic). Gross je bio plodan kirurg i jedan je od njegovih udžbenika, Sustav kirurgije (System of Surgery), doživio 6 izdanja. Ono što je malo poznato jest činjenica da je ta knjiga također pokrila neurokirurške bolesti i tehnike. Gross je bio vješt kirurg i sposoban pisac. Njegovi udžbenici o kirurgiji bili su dobro primljeni u njegovo vrijeme. Štoviše, trebao bi se smatrati ranim pionirom neurokirurgije, budući da je njegov Sustav kirurgije ispunjen neurokirurškim dijagnozama i neurokirurškim tehnikama

Optical links in the angle-data assembly of the 70-meter antennas

In the precision-pointing mode the 70 meter antennas utilize an optical link provided by an autocollimator. In an effort to improve reliability and performance, commercial instruments were evaluated as replacement candidates, and upgraded versions of the existing instruments were designed and tested. The latter were selected for the Neptune encounter, but commercial instruments with digital output show promise of significant performance improvement for the post-encounter period

Macro/micro observational studies of fibres maintaining the biceps brachii tendon in the bicipital groove: application to surgery, pathology and kinesiology

Background: There is controversy over the nature of tissues covering the bicipital groove protecting the biceps brachii tendon from dislocation/subluxation causing shoulder pain. Recent researches on cadaveric dissection and histological studies have changed the old concept of the transverse humeral ligament covering the bicipital groove to tendinous fibres of the subscapularis or interdigitating fibres of the subscapularis and supraspinatus. The change has not been incorporated into standard text books of anatomy. Therefore, the aim of the study is to support the new or old concept. Materials and methods: Eighteen embalmed shoulders were dissected to determine the nature of the tissues over the bicipital groove. Tissues from 4 shoulders were processed and 16 histological slides were examined for fibre types. Theoretical analysis of ligament and tendon has also been carried out. Results: The dissection study revealed that the tissues over the bicipital groove were tendinous fibres of subscapularis/interdigitating fibres of the subscapularis and supraspinatus and fibrous expansions from the posterior lamina of the pectoralis major. This was supported by the histological slides which showed the signatures of collagen fibres with the characteristics of tendinous fibres. Conclusions: No separate anatomical entity such as the transverse humeral ligament was detected in this study. Thus present study supports the view that the tissues covering the bicipital groove were formed by tendinous rather than ligamentous fibres

Diffraction-limited CCD imaging with faint reference stars

By selecting short exposure images taken using a CCD with negligible readout noise we obtained essentially diffraction-limited 810 nm images of faint objects using nearby reference stars brighter than I=16 at a 2.56 m telescope. The FWHM of the isoplanatic patch for the technique is found to be 50 arcseconds, providing ~20% sky coverage around suitable reference stars.Comment: 4 page letter accepted for publication in Astronomy and Astrophysic

Ectopic arachnoid granulation involving a rare intracranial venous sinus variant

Arachnoid granulations are hypertrophied arachnoid villi, which extend from the subarachnoid space into the venous system and aid in the passive filtration and reabsorption of cerebrospinal fluid. These macroscopic structures have been described in various locations, with the transverse and sigmoid sinuses seen as normal variants on imaging. Here we present the occurrence of an enlarged arachnoid granulation at the foramen rotundum where a variant intracranial venous sinus was identified during routine dissection. Variations, such as the one described herein, should be recognised by those who operate or interpret images of the skull base

Abating Prejudice With Presence: Dispositional Mindfulness Increases Interracial Helping Behavior

Helping behavior is less frequently shown toward members of social out-groups (Cikra, Bruneau, & Saxe, 2011). Race defines a common source of social division in America and other countries, and although most condemn racial discrimination, helping is undermined in interracial interactions (Saucier, Miller, & Doucet, 2005). Recent theory suggests that mindfulness, a receptive attention to one’s present experience, can attenuate the conceptual boundaries that typically separate and distance oneself from others (Trautwein, Schmidt, & Naranjo, 2014). We designed an experiment to examine whether dispositional mindfulness would be associated with increased helping behavior in interracial contexts. Self-identifying White participants (N = 139) witnessed a confederate in need of help while waiting to participate in a study, and experimenters observed whether participants helped them or not; self-identifying White or Black confederates were randomly assigned to each experimental session. Three-block sequential logistic regression models were constructed to identify predictors of same-race and interracial helping. Overall, dispositional mindfulness, agreeableness, and lower racial prejudice predicted greater helping behavior in same-race interactions (all ps \u3c 0.05). Interestingly, mindfulness moderated the help-reducing effects of racial prejudice in the interracial interactions (p \u3c 0.05). More specifically, high mindfulness was associated with increased helping behavior among those high in racial prejudice. This correlational evidence is consistent with mindfulness theory, which suggests deploying mindful attention dampens psychological barriers between self and others. This study highlights the potential for mindfulness in reducing defensive attitudes and increasing prosocial responsiveness across social lines.https://scholarscompass.vcu.edu/uresposters/1230/thumbnail.jp