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Still Life Disrupted

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Mad Hatter

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The Economics of the Blockchain: A study of its engineering and transaction services marketplace

The purpose of this document is to discuss the origins, developments, and economic issues of blockchain technology as well as the industry opportunities presented by different forms of ledger systems. The engineering of digital currencies\u27 blockchains are presented beginning with bitcoin and its blockchain. Afterwards, specific areas of contention within the engineering innovations and their interaction with the economics of blockchain transaction services with respect to the consensus process are discussed. Finally, industry opportunities are presented and specific organizations\u27 applications are described

Buoyancy Effects On Building Pressurization In Extreme Cold Climates

Thesis (Ph.D.) University of Alaska Fairbanks, 2003This research investigates building pressurization due to buoyancy effect. The American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) presents an idealized equation to calculate the buoyancy effect. This dissertation compares differential pressure measurements from an actual building exposed to extremely cold temperatures to this idealized model. It also presents new statistical models based on the collected data. These new models should provide engineers with improved tools to properly account for building pressurization for designs in extreme cold climates. Building pressurization, the differential pressure between the interior of a building and its exterior surroundings, is an important design consideration. Pressurization is the driving force in building infiltration/exfiltration. It also affects air flow within building zones. Improper calculation of pressurization can result in under-sizing the building's heating and cooling systems, improper operation of air distribution systems, improper operation of elevators, and freezing and failure of water distribution and circulation systems. Building pressurization is affected by: wind (speed and direction), exterior-to-interior temperature difference, and mechanical equipment operation. In extreme cold climates, the predominant effect is air buoyancy due to temperature differences across the building envelope. The larger the temperature difference, the larger the buoyancy effect. In extreme cold climates, the largest temperature differences often occur at times when wind speed is negligible. This dissertation also demonstrates the use of existing data sources such as building automation systems to collect data for basic research. Modern systems automation provides a tremendous amount of data that, in the past, had to be collected through separate instrumentation and data acquisition systems. Taking advantage of existing automation systems can provide the required data at greatly reduced costs when compared to previous industry practices. The statistical analysis approach taken in this research expands the tools for engineering design. Actual interactions of real world variables are analyzed and used to produce prediction models. These techniques allow the model to incorporate relationships which may not be fully understood at the underlying principle level but are evidenced in the data collected from actual installations.* *This dissertation includes a CD that is compound (contains both a paper copy and CD as part of the dissertation). The CD requires the following applications: Internet Browser; Adobe Acrobat; Microsoft Office; Image Viewer

Incidence of Skin Trauma Associated with Participation in Intercollegiate Soccer

Participation in soccer at the intercollegiate level has increased dramatically in the United States over the past 20 years. Past studies have identified the frequency and mechanisms of musculoskeletal injury among various populations. However, data on the incidence and etiology of skin trauma associated with intercollegiate athletic participation is limited in the literature. The purpose of this study was to measure the frequency of skin trauma and determine the injury rate (IR) based on exposure to injury among male and female soccer student-athletes at a NCAA Division II institution. A case reporting and exposure form was used to collect the data over a competitive soccer season. Descriptive statistics were calculated for the data. A total of 18 wounds were documented, 11 (61%) among males and 7 (39%) among females. The overall IR for males was 4.6 wounds/1000 athletic exposures (AE) and females 3.9 wounds /1000 AE. The most common wounds were blisters (83.3%) and abrasions (16.7%) occurring most frequently to midfielders (61%). The most common mechanism of injury was rubbing/friction (94.4%) through contact with clothing (44.4%). The reported wounds occurred during practice (77.8%) and competition (11.1%) activities on grass (94.4%). The most frequently injured body locations were the foot (38.9%) and heel (27.8%). As risk factors are identified, steps toward prevention, management, and cost-effectiveness strategies can be developed

How far away is plug 'n' play? Assessing the near-term potential of sonification and auditory display

The commercial music industry offers a broad range of plug 'n' play hardware and software scaled to music professionals and scaled to a broad consumer market. The principles of sound synthesis utilized in these products are relevant to application in virtual environments (VE). However, the closed architectures used in commercial music synthesizers are prohibitive to low-level control during real-time rendering, and the algorithms and sounds themselves are not standardized from product to product. To bring sound into VE requires a new generation of open architectures designed for human-controlled performance from interfaces embedded in immersive environments. This presentation addresses the state of the sonic arts in scientific computing and VE, analyzes research challenges facing sound computation, and offers suggestions regarding tools we might expect to become available during the next few years. A list of classes of audio functionality in VE includes sonification -- the use of sound to represent data from numerical models; 3D auditory display (spatialization and localization, also called externalization); navigation cues for positional orientation and for finding items or regions inside large spaces; voice recognition for controlling the computer; external communications between users in different spaces; and feedback to the user concerning his own actions or the state of the application interface. To effectively convey this considerable variety of signals, we apply principles of acoustic design to ensure the messages are neither confusing nor competing. We approach the design of auditory experience through a comprehensive structure for messages, and message interplay we refer to as an Automated Sound Environment. Our research addresses real-time sound synthesis, real-time signal processing and localization, interactive control of high-dimensional systems, and synchronization of sound and graphics

Determinants of Self-Employment in the United States

The prominence entrepreneurs have occupied in the popular imagination belies their relative neglect in formal economic theory. This paper adds to the growing body of work on entrepreneurs by examining the characteristics of self-employed individuals in the National Longitudinal Survey of Youth 1997. We believe our article to be the first that uses this fresh body of data for this purpose. Employing the standard binomial probit model with a list of potentially significant variables drawn from existing literature, we discovered that women are significantly less likely to be self-employed than men

Reduction of Uranium by Bacterial Products

The Old Rifle Mill Processing site at Rifle, CO, contains uranium contaminated groundwater. The presence of uranium is one of the major problems at Department of Energy legacy sites. There is an initiative for attenuation of uranium by the Department of Energy. Uranium undergoes oxidation/reduction reactions with the substances at the site. Uranium’s oxidation state determines its solubility and mobility in the aquifer. The oxidation reduction pathways at this site have mineralogical, microbial and geochemical components. Understanding the oxidation/reduction pathways of these components will allow for better predictions of the changes and movement of uranium. Sulfide [S2- ] and Ferrous [Fe2] ions are products of microbial activity. These ions can reduce uranium [U(VI)], but bicarbonate ions [HCO3-] in the aquifers slows down the reaction. However, we believe that organic matter in the environment enhances U(VI) reduction by Fe2+and S2- in the absence of microbes. To address this, U(VI) was mixed with Fe2+ or S2- in autoclaved biomass from Rifle and artificial groundwater for seven to eleven days. Aqueous samples from the vials will be analyzed for Uranium presence using ICP-MS [Inductively Coupled Plasma- Mass Spectrometry]. The biomass from each of the samples will be analyzed using XAS [X-Ray Absorption Spectroscopy] to determine the ionization state of Uranium. Based on the data, we can conclude that there is a significant decrease of the concentration of uranium from the reaction when the biomass was not sterilized. There were no differences within in the vials that had Fe2+ or S2-. The XAS data shows a mixture of U(IV) and U(VI) in the biomasss and more U(IV) in the biomass that was not sterilized. This suggests that the bacterial products alone is not completely responsible for the reduction of uranium