Hydrogeological and Hydrochemical Investigations in West Nymph Creek Thermal Area, Yellowstone National Park, USA

Fast changing geothermal features characterize the Yellowstone National Park, USA. Highresolution aerial images were taken to map the hydrothermal study area. The combination of a digital camera and a low flying (< 100 m) helium balloon was a cost and time effective method to get a status quo of the feature’s form and size. The resulting aerial overview has a resolution of 2.5 cm and is presented in a multilayer digital atlas, providing a basis for further surveying. Ground survey included mapping and on-site hydrochemistry of 18 major hydrothermal features. Arsenic concentrations are known to be elevated in Yellowstone (1.7 ± 2 mg/L) - therefore, beside trace element analysis with ICP-AES, three techniques for As speciation were applied: HG-AAS, HPLC-ICP-MS, and on-site SPE with GF-AAS. Surprisingly low total As concentrations made an evaluation of the different methods difficult. Grouping the water samples revealed two water types: steam heated waters (type I) and waters with a deep thermal origin (type II). Thus, a known hydrogeological model (White et al. 1988) is checked for its applicability to the study area.researc

Designing Simplicity to Achieve Technological Improvement: The General Electric J79 Turbojet Engine; Innovations, Achievements and Effects

With the beginning of powered, manned flight, the piston engine drove a propeller or multiple propellers to provide the thrust for lift required to overcome the forces of drag and gravity for flight. As aircraft speeds gradually increased over time, the power needed to overcome the aerodynamic inefficiencies of the propeller to greater speeds and altitudes were quickly realized as a hindrance to the potential of aircraft. With the turbojet engine, this new mechanism and subsequent aerodynamic changes revolutionized aircraft to increased speeds and altitude never before achievable with a piston engine. The United States, after acquiring further and more extensive turbojet engine knowledge from the British during World War II, steadily developed the technology. In a relatively brief amount of time, the turbojet was able to power aircraft reliably beyond the speed of sound. The General Electric axial flow J79 turbojet engine generated a lasting technological innovation with the first use of production ready variable incidence stator vanes that allowed jet engines to begin to overcome compressor stall. Compressor stall can occur as air flows through the jet engines various air compressing guide and stator vanes with low air pressure building just behind a given blade. The low pressure air cell can cause damaged vanes; build to the point of causing a rotational stall which critically impedes the rotation of the engine, can migrate to the combustion chamber starving the fuel of oxygen needed for ignition, or cause the complete reversal of air flow within the engine. These events can cause minor to catastrophic engine damage or even complete engine failure. Variable incidence stator vanes were no longer static but were adjustable to allow the optimum angle of airflow around the various vanes and thus controlled the compressibility of the airflow through the engine reducing the likelihood of stalls. The use of the this variable stator design within the J79 turbojet allowed the engine to be smaller in diameter, removed complexity, and weighed considerably less than other competing turbojet engines of the time, laying the groundwork for a production run of over thirty years and speeds exceeding Mach 2, or twice the speed of sound. The purpose of this study is to analyze the General Electric J79 Turbojet engine as it relates to its contemporary turbojet engines, the aircraft it powered, and the effects for General Electric and the military powerplant industry. Additionally, the purpose of this study is to illustrate how the engine helped assist aircraft designers and their companies to satisfy Armed Forces proposals for increased speeds, payloads, systems and the missions to meet a national philosophy of deterrence of a newly perceived threat during the Cold War with the Soviet Union and her Warsaw Bloc allies

Technology, Alienation, and the South Korean Factory Worker

A thesis presented to the faculty of the School of Social Sciences at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Arts by Jerre R. Brimer on July 29, 1977

The Devil is in the Definition – Definitions and their Limited Use in Legal Problem Solving

The lawyer’s usual attempt to catch the meaning of a thing by entangling it in a net of words is based on a common misapprehension of the way words work. The great minds of the ages have since time immemorial reminded us that words do not contain essences, that meanings are social constructs, and that the relation between words and meanings is slippery at best. Definitions presuppose that words have simple meanings attached to them in something like a one-to-one relationship, which is why the law can sometimes be so obtuse. It is the use of the law in a tribunal that provides the eventual understanding of how the law works. Decisions handed down in courts are embedded in a particular time and a particular set of circumstances and are the products of minds informed by a set of social experiences which other lawyers accept as qualifying those particular persons to pronounce on the law. Our legislature would do well when framing legislation to imitate those who drafted the Constitution of the Republic of South Africa, 1996 which is sufficiently specific, without the support of pages of definitions, to lead to very precise argument in the Constitutional Court, and yet sufficiently general to allow the law to develop with the flux of time.  

A state roof over my head : policies, perspectives and experiences of state housing in Aotearoa New Zealand : a thesis presented in partial fulfilment of the requirements for the degree of Master of Arts in History at Massey University

Through the experiences of those who lived in state housing, this work examines how changing housing policies determined what state housing tenants’ experiences would be. Historical accounts of state housing are often centred around the egalitarian intentions of the First Labour Government’s ‘welfare state’, and then the subsequent attempts to reduce the state’s role in the provision of housing. This research builds upon existing literature mapping major developments in state housing policy over the twentieth century, from the creation of a state rental sector in the 1930s that was widely approved of, through to the upheaval of the welfare state in the 1990s. Taking Ben Schrader’s lead, this research is based on an oral history from state tenants, adding an insider perspective from New Zealanders who lived in state housing. Incorporating personal accounts of life in state housing, this thesis revealed how perceptions of community and what home means to different people has been inextricably linked with the housing decisions made by government. Despite changing government policies and the various pressures that resulted, irrespective of the period, state housing allowed its tenants to see themselves as part of a community

Photon Bound States in Coupled Waveguides

Photon bound states have been identified as particular solutions to the scattering of two photons from a single emitter, but from these results the full nature of these states remains elusive. We study a novel, clear and unambiguous signature that these bound states are truly bound. To this end we consider a new configuration of close-by waveguides, each chirally coupled to two-level emitters. We show that in this system the photon bound states behave like rigid molecules, where photons do not tunnel individually but rather collectively, such that there is rarely a single photon in each waveguide. We further identify new classes of bound states in this system.Comment: 8 pages, 7 figure

Fødevaresikkerhed over nettet - en udfordring der blev løst

F&oslash;devarer produceres verden over. I dag fragtes de verden rundt i et stadigt stigende omfang. I denne globaliserede virkelighed b&oslash;r uddannelse i kemisk‐ og mikrobiel f&oslash;devaresikkerhed og risikovurdering v&aelig;re interdisciplin&aelig;r og international i alle aspekter. Med baggrund i et eksisterende kursus i kemisk f&oslash;devaresikkerhed for f&oslash;devarestuderende, som &aring;r for &aring;r fik flere studerende fra udlandet (Europa, Asien, Afrika og Sydamerika), samt et grundkursus for veterin&aelig;rstuderende i mikrobiologisk f&oslash;devaresikkerhed besluttede to undervisere at skabe noget nyt. Det blev til et kursus i risikovurdering, kemisk s&aring;el som mikrobiologisk, for f&oslash;devare‐ og veterin&aelig;rstuderende i blandet flok.Efter et par &aring;r skulle der nye udfordringer til. Vi gik i gang med at udvikle et 100 % online‐kursus i kemisk og mikrobiologisk f&oslash;devaresikkerhed. Det ni uger lange kursus (7,5 ECTS) har nu v&aelig;ret afviklet for f&oslash;rste gang med 12 tilmeldte, hvoraf de 11 gennemf&oslash;rte. De studerende repr&aelig;senterede Danmark, Sverige, Polen, Belgien, Frankrig og Portugal. Kurset udvikledes med udgangspunkt i professor Gilly Salmons (University of Leicester) 5‐trins model for e‐l&aelig;ring; som denne l&oslash;bende er blevet praktisk videreudviklet ved Det Biovidenskabelige Fakultet, KU, af IT‐learning Centers e‐l&aelig;ringskonsulenter. I praksis byggede l&aelig;ringen i det f&aelig;digudviklede kursus p&aring; s&aring;kaldte e‐tivities med skrevne faglige online‐diskussioner mellem hhv. studerende og studerende‐undervisere. Eksamen gennemf&oslash;rtes som videom&oslash;de mellem de to undervisere og den enkelte studerende under anvendelse af Adobe Connect software.Vi erfarede, at samspillet mellem de forskellige f&oslash;devarekulturer kunne bringes til at berige kurset n&aring;r e‐tivities formuleredes s&aring;ledes, at den enkelte studerende tog udgangspunkt i en blanding af uddannelsesbaggrund og hjemlig mad‐kulturel viden. Praktiske erfaringer blev h&oslash;stet specielt vedr&oslash;rende afvikling af videom&oslash;de‐eksamen, som n&aelig;mere redegjort for i artiklen

Relationship of the Self-Concept of Girls to Peer Acceptance

Home Economics Educatio