Linearized unsteady jet analysis

The introduction of a time dependency into a jet flow to change the rate at which it mixes with a coflowing stream or ambient condition is investigated. The advantages and disadvantages of the unsteady flow are discussed in terms of steady state mass and momentum transfer. A linear system which is not limited by frequency constraints and evolves through a simplification of the equations of motion is presented for the analysis of the unsteady flow field generated by the time dependent jet

Attitudes of Normal Hearing Listeners Towards Personal Sound Amplification Products: Sound World Solutions CS50

Over 23 million individuals in the United States have some degree of hearing loss but do not own hearing aids. Individuals may choose not to adopt hearing aid technology for an assortment of reasons, including the stigma associated with hearing aids, cost of the devices, or denying the effects of hearing loss. Prevalence of hearing aid usage remains low despite research indicating that untreated hearing loss is correlated with decreased quality of life and accelerated cognitive decline. In recent years, personal sound amplification products (PSAPs) have entered the market as simple, low cost, discreet devices in attempt to reach non-users of amplification. The purpose of this study was to determine if the Sound World Solutions CS50 PSAP affects speech understanding in noise in normal hearing adult listeners. Listening to speech in noise is difficult for a majority of those with hearing loss and an important situation the CS50 is marketed to help improve. Such claims, however, have not been substantiated. This study also examined the experience of these individuals with the CS50, including their attitudes on ease of use, comfort, and willingness to pay, via a brief questionnaire. Results of this study indicated that there is no significant difference in the speech recognition in noise scores of normal hearing listeners when they are unaided and when they are aided monaurally with the CS50 device. Overall, individuals judged the ease of inserting/removing the device, changing the battery, and changing the program and volume to be good to very good. Physical comfort, appearance of the device, sound quality, and benefit to speech understanding in noise were judged to be fair. A majority of individuals were somewhat unwilling to spend $200-$300 on this device should they require amplification. Lack of significance among speech in noise scores and fair judgments of many factors regarding the Sound World Solutions CS50 PSAP may have resulted from not truly assessing the device’s directional microphone and testing only normal hearing listeners who do not have as much need for an amplification device as an individual with hearing loss. Further testing on individuals with hearing loss may help determine of this device would benefit such a population

Koenikea-species (Acari, Hydrachnellae) from the Amazon region

20 Arten des Genus Koenikea (Acari, Hydrachnellae) werden aus Amazonien beschrieben, von denen 1 bereits bekannt, 12 neu für die Wissenschaft sind. Das Material wurde von H. Sioli 1952 gesammelt. Die übrigen Wassermilben-Arten wurden bereits von VIETS (1959) veröffentlicht

Results of the Austrian-Ceylonese hydrobiological mission 1970 of the 1st Zoological Institute of the University of Vienna (Austria) and the Department of Zoology of the Vidyalankara University of Ceylon, Kelaniya. Pt. 3. Uber einige wassermilben aus Ceylon (Hydrachnellae, Acari)

In the study are described five species of watermites, collected by the Austrian-Ceylonese hydrobiological mission 1970 in torrents of the highlands of south-west Sri Lanka. The species are: Torrenticola (Monatractides) pusta Cook, 1967, T.(M.) Oxystoma hamata (Lundbald, 1941), T.(M.) ceylonensis nov. spec., Atractides schwoerbeli Lundbald, 1969 and Arrenurus (Micruracarus) madaraszi Daday, 1898

The Language of Liberty: Milton’s Nationalistic Linguistics

English as Lingua Franca, or ELF, seems a straightforward concept: in today’s globalized society, speakers of all varieties of languages elect to use English as a means of communication, regardless of their native tongues. The origins of ELF lie in the era of aggressive British and American imperialism, when English was forced on much of the world as a language of governance. At that time, native speakers held considerable power over non-native speakers; “proper” English was a marker of civilization as defined by the colonizer and entrance into positions of power depended on mastering it (frequently at the expense of one’s native language). Given the ubiquity of English as the modern lingua franca and its imperialistic past as something of a bully language, it can come as a bit of a shock to shift one’s linguistic paradigm back a few centuries to the English Renaissance, when English was struggling to prove itself to the more prestigious French, Italian, and then-lingua franca, Latin. In England, various scholars tried to enhance their mother language’s reputation, largely by making it more like Latin in its vocabulary and syntax. But these attempts were always in tension with a nationalism that asserted that English was fine just the way it was and should be recognized for its own merits as a language of the common people, not of scholars. One man who skillfully navigated these two opposing forces and largely succeeded in reconciling them was John Milton, one of England’s greatest poets and propagandists. His career was equal parts building up the English language, defending the English people, and encouraging both to match and then surpass the linguistic might of the Continent. Through his political prose and his poetry, both in English and Latin, Milton sought to prove that England could deftly wield language to assert its dominance in political, religious, and (the highest laurels for Milton) literary spheres

Optimizing Advanced Ligo\u27s Scientific Output with Fast, Accurate, Clean Calibration

Since 2015, the direct observation of gravitational waves has opened a new window to observe the universe and made strong-field tests of Einstein\u27s general theory of relativity possible for the first time. During the first two observing runs of the Advanced gravitational-wave detector network, the Laser Interferometer Gravitational-wave Observatory (LIGO) and the Virgo detector have made 10 detections of binary black hole mergers and one detection of a binary neutron star merger with a coincident gamma-ray burst. This dissertation discusses methods used in low and high latency to produce Advanced LIGO\u27s calibrated strain data, highlighting improvements to accuracy, latency, and noise reduction that have been made since the beginning of the second observing run (O2). Systematic errors in the calibration during O2 varied by frequency, but were generally no greater that 5% in amplitude and 3 deg in phase from 20 Hz to 1 kHz. Due in part to this work, it is now possible to achieve calibration accuracy at the level of ~1% in amplitude and ~1 deg in phase, offering improvements to downstream astrophysical analyses. Since the beginning of O2, latency intrinsic to the calibration procedure has decreased from ~12 s to ~3 s. As latency in data distribution and the sending of automated alerts to astronomers is minimized, reduction in calibration latency will become important for follow-up of events like the binary neutron star merger GW170817. A method of removing spectral lines and broadband noise in the calibration procedure has been developed since O2, offering increases in total detectable volume during future observing runs. High-latency subtraction of lines and broadband noise had a large impact on astrophysical analyses during O2. A similar data product can now be made available in low latency for the first time

Emily Dickinson's character as revealed by her poetry

Thesis (M.A.)--Boston University This item was digitized by the Internet Archive

Chief Digital Officers and Environmental Performance in Complex Settings

This paper studies the impact of a chief digital officer (CDO) on corporate environmental performance. Drawing on the upper echelons theory and the attention-based view, we examine whether and under what environmental contingencies the presence of a CDO affects a firm’s environmental performance. To test our theory, we use a dataset of 514 publicly-traded U.S. firms and analyze their greenhouse gas (GHG) emissions from 2005 to 2021. Our results show that the presence of a CDO is negatively associated with GHG emissions and that environmental complexity moderates this relationship. Thereby, we extend the understanding of the outcomes of new functional top management team members and contribute by bringing the industry environmental level into the analysis. In addition, the results encourage managers to consider corporate environmental performance outcomes and environmental contingencies when deciding whether to implement a CDO role