• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 91
  • 44
  • 23
  • 9
  • 7
  • 4
  • 2
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 202
  • 45
  • 45
  • 43
  • 42
  • 41
  • 31
  • 26
  • 26
  • 26
  • 23
  • 20
  • 20
  • 18
  • 18
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
81

Štefánikova hvězdárna - posledních 45 let očima jejích pracovníků / Štefánik observatory - last 45 years seen by its employees

Studená, Lenka January 2012 (has links)
Main issues of this work are to describe the surrounding of Štefánik observatory and to extend knowledge about its wide history, specially the recent one. Cornerstones of this knowledge have become from interviews with the employees, who worked on Štefánik observatory during the normalization, possibly earlier; and some of them are still work there. The leading of the interviews was made by method of oral history. The work is based also on available bibliography, which concerns mostly to methodology; newspaper articles which relate to observatory history or important events. The text is primarily focused on interviews experiences and feelings and besides the work presents their testimony. In the text are worked up some topics, which concern to professional activity, relationships, perceptions of ages 1968 and 1989, and finally the projection the movies about Apollo programme. The goal of this work is not come to clear conclusions but to reflect experiences of interviewees into historical context, alternatively take a look into working life of Štefánik observatory employees. Keywords: Štefánik observatory, guide, astronomy, normalization, oral history, interview
82

The Geologic History of Subsurface Arkosic Sedimentary Rocks in the San Andreas Fault Observatory at Depth (SAFOD) Borehole, Central California

Draper, Sarah D. 01 May 2007 (has links)
The aim of the San Andreas Fault Observatory at Depth (SAFOD) project, a component of the NSF Earthscope Initiative, is to directly observe active fault processes at seismogenic depths through the drilling of a 3 km deep (true vertical depth) inclined borehole across San Andreas fault. Preliminary subsurface models based on surface mapping and geophysical data predicted different lithologies than were actually encountered. At 1920 meters measured depth (mmd), a sequence of well-indurated, interbedded arkosic conglomerates, sandstones, and siltstones was encountered. We present a detailed lithologic and structural characterization as a step toward understanding the complex geologic history of this fault-bounded block of arkosic sedimentary rocks. We divide the arkosic section into three lithologic units with different compositional, structural, and sedimentary features: the upper arkose, 1920-2530 mmd, the clay-rich zone, 2530-2680 Illtlld, and the lower arkose, 2680-3150 mmd. We interpret the section to have been deposited in a Salinian transtensional basin, in either a subaqueous or subaerial fan setting. We suggest four different possibly equivalent sedimentary units to the SAFOD arkoses, the locations of which are dependent on how the San Andreas fault system has evolved over time in the vicinity of the SAFOD site. Detailed analysis of three subsidiary faults encountered in the arkosic section at 1920 mmd, 2530 mmd, and 3060 mmd, shows that subsurface faults have similar microstructures and composition as exhumed faults at the surface, with less evidence of alteration from extensive fluid flow.
83

Vulnérabilité et Adaptation des territoires aux effets du changement climatique.Incitations globales, stratégies locales. Perspectives pour un développement territorial axé sur un suivi de l’utilisation de l’espace et des ressources dans les Communes de Mbour, Saly et Malicounda (Sénégal) / Vulnerability and Adaptation of territories to climate change. global incentives, local strategies. Outlook for territorial development focused on monitoring the use of space and resources in the towns of Mbour Malicounda, Saly (Senegal)

Thiaw, Diatou 19 February 2016 (has links)
Le littoral est aujourd’hui affecté par différents phénomènes. Inondation, érosion côtière, perte biodiversité, dégradation des terres…, constituent autant de facteurs de dysfonctionnement. Les enjeux sont à la fois écologiques, socioéconomiques et politiques. L’observation sur des zones urbaines et rurales de Mbour, Saly et Malicounda montre des facteurs de vulnérabilité à la fois naturels et anthropiques. Les changements identifiés ne peuvent être spécifiquement l’effet du changement climatique ; ils représentent aussi le prolongement de situations enclenchées par facteurs physiques, sociaux, économiques, politiques, propres aux territoires Selon les perturbations étudiées, les territoires apparaissent différemment vulnérables. La destruction d’habitations et d’infrastructures, la baisse des captures, des revenus de la pêche, du tourisme et de l’agriculture constituent des impacts auxquels font face les différents acteurs dont les stratégies développées ne sont généralement ni anticipatives, ni efficaces. Il se pose également un problème de responsabilité des acteurs dans la maitrise des perturbations et de leur dynamique dans cette zone stratégique sur le plan économique. Pour une bonne gestion des risques, cette thèse invite à une réelle politique d’aménagement du territoire et à la mise en place d’un observatoire. / The coast is now affected by different phenomena. Flooding, coastal erosion, biodiversity loss, land degradation ..., are all factors malfunction.The issues are both ecological, socioeconomic and political. The observation on urban and rural areas of Mbour, Saly and Malicounda shows vulnerabilities of both natural and anthropogenic. The observed changes may be specifically the effect of climate change; they also represent a continuation of situations switched by physical, social, economic, political, of territories. According to the perturbations studied, territories appear differently vulnerable. The destruction of homes and infrastructure, declining catches, revenues from fishing, tourism and agriculture are the impacts faced by different actors. The strategies developed are generally neither proactive nor effective. It also poses a problem of responsibility of actors in the mastery of disturbances and their dynamics in this strategic area economically. For a good risk management, this thesis calls for a real policy of regional planning and the establishment of an observatory.
84

Město pod hvězdami / The Town under the Stars

Černá, Tereza January 2019 (has links)
The aim of my thesis is to find and insert a new function to the city of Sumperk in a way as sensitive as possible to the city environment, based on its needs and was beneficial not only for the city itself but also for the bigger region.
85

Qualitative assessment of the contribution of permanent highway observatories to socio-economic evaluations in France / Kvalitativ utvärdering av permanenta motorvägsobservatoriers bidrag till samhällsekonomiska bedömningar i Frankrike

Gaborit, Robin January 2021 (has links)
This degree project was carried out at the transport design office Setec International, in Paris, from August 3rd to December 18th, 2020. I was part of the team in charge of the post-evaluation of the A150 highway.Permanent observatories are organizations that bring together public and private actors in order to collect early and systematically data to analyze the effects of a transport infrastructure. They have been set up since the 1980s, mainly on French highways. In particular, they contribute to the production of a posteriori assessments known as "LOTI". The objective of this project is to qualitatively evaluate the contribution of these observatories to socio-economic evaluations, both for "classic" and "wider economic" effects. The methods used are the "practical" experience of carrying out the LOTI assessment of the A150, the study of reports describing the results of the A39 and A71 observatories, and the analysis of reports from the State services on the quality of LOTI assessments.The permanent observatories limit some of the pitfalls of ex-post assessments linked to the measurement of classic effects, especially traffic and journey times. They also highlight the effects of a construction site and the strategies of the economic actors. However, they retain certain limitations of ex-post assessments such as the spatial and temporal scale, or the concessionaire's willingness not to disclose certain data. Thanks to early and regular data collection, permanent observatories seem to contribute significantly to the analysis of classic and wider economic effects, they limit the risk of poor quality analyses. Nevertheless, they do not seem indispensable for the production of studies of satisfactory quality.The rare data available on the cost of the observatories suggest that it is very low compared to the amounts invested in construction. Thus, in comparison with these costs, this end-of-study project gives a positive qualitative assessment of the contribution of permanent highway observatories to socio-economic studies. However, this study is limited by the amount of data available due to the non-mandatory nature of setting up permanent observatories.
86

VODA + MĚSTO propojení břehů Bystrc – Kníničky / WATER+TOWN linking banks Bystrc - Kníničky

Nováková, Petra January 2012 (has links)
LEISURE CENTRUM ON THE BORDER OF TWO TERRITORIAL UNITS. RIVER SVRATKA AS A BORDERLINE, RIVER SVRATKA AS A CONNECTION POINT. DESIGN OF A BUILDING AND URBAN STRUCTURE IS BASED ON THE MOVEMENT OF THE RIVER AND ON THE VISUAL CONNECTION OF THE TWO RIVER SIDES. TWO WAYS ARE CROSSING AND IN THE MIDDLE CREATING DOMINANT. POINT OF INTEREST. PLACE OF RELAXATION. IDEAL HAPPY DAY.
87

Low Noise Front End Signal Transport Design for L-band Phased Array Receivers

Ammermon, Spencer M. 15 December 2022 (has links)
RF receiver improvements in size, weight, power, and sensitivity are constant goals in the wireless communications community. The combination of phased array antenna systems with high speed analog to digital converters helps engineers meet these goals, because many of the analog components and tasks found in a traditional receive chain are moved into the digital domain. Although the hard work of signal reception is moved into digital signal processing, digital receivers rely on a high performance analog front end to properly condition a signal before analog to digital conversion. In this thesis, two RF front ends are developed for direct sampling L-band phased array receiver applications, which comprise the two main chapters of this document. Both RF front ends are developed on low cost, quick turnaround time PCB materials. Results for system gain and noise figure are presented for each front end. First, the development of an L-band analog front end for a direct sampling GPS phased array receiver is described, with particular attention to gain and noise figure in context of the full system link budget. The RF front end for the GPS phased array receiver meets design expectations by achieving a system gain of 65 dB and a system noise figure of 1.5 dB at the GPS L1 frequency. Second, the redesign and improvement of the Advanced L-band Phased Array Camera (ALPACA) RF over fiber transmitter is documented. New mechanical and electrical design requirements were brought on from the change of target observatory from the collapsed Arecibo obervatory in Puerto Rico, to the Greenbank Observatory in Greenbank, West Virginia. The ALPACA RF over fiber signal transport system with the redesigned transmitter reaches the design expectation of a system noise temperature contribution less than 1 K. Average gain of the RF over fiber system is 49 dB, gain differences between channels are less than 2 dB, and isolation between channels is better than 35 dB. Under optimal conditions, the noise figure of the RF over fiber link is 2.4 dB (213.3 K), which allows for up to 11 dB of attenuation to be added to any given transmit channel to level the gain across all 138 ALPACA channels.
88

Global Cultures – Critical Zone Observatories of Everyday Objects : (A Global Environmental History of Yogurt) / Globala kulturer, probiotisk biopolitik : En miljöhistoria av yoghurt

Charbonneau, Leni January 2022 (has links)
This study turns to what is for many an everyday item – yogurt – as a critical zone observatory, a synergistic, place-based laboratory which aims to integrate heterogenous representations of planetary phenomena as they are registered at a common surface. Yogurt has an impressive cultural endurance largely derived from its prominence in various paradigms of health. The product has culturally endured in another sense: as a common cultural medium where humans and microbes have met for generations. This study begins with a profile of yogurt as most encounter it today to consider how normative notions of health interface with the temporal and spatial imaginaries entailed in commodity geographies. Commoditized yogurt is characterized by a low and limited microbial biodiversity compared to yogurts produced outside of the commodity context. Yogurt is therefore presented as a micro case study to consider modes by which we sense and valuate ecological phenomena beyond the perceptible surface, how such sens-abilities intersect models of health, and to what effect. To trace a history of yogurt along these contours, I introduce it as a particular kind of artefact: a global object. As an object of environmental history, I define a global object as a global commodity with a high potential to be re-localized, and therefore with a high potential to re-shape commodity geographies. However, this trajectory is contingent upon framing yogurt as a critical zone observatory – a site where global phenomena like human-microbial interaction may become familiar and intimate. Guided by new materialist theory, I weave together historical and ethnographic case studies from the following consortium: resident yogurt bacteria, artisanal yogurt producers and home fermenters, a mystical immunologist, and an 11th century linguistic scholar. Through these perspectives, I both sketch and apply a framework for de-centered, interspecies histories of cultural (re)production through an extended metaphor of biofilm: the coagulative bacterial structure giving yogurt its characteristic texture. In so doing I provide a re-articulation of “the probiotic” as an integrative case of human and more-than-human health. The study concludes by directing these implications towards a consideration of aesthetic engagement by displaying how fermentation practice may enliven matters of re-diversification and re-localization.
89

Upper Limits on the Ultra-High Energy Cosmic Ray Flux from Unresolved Sources

Burton, Ross E. 30 January 2012 (has links)
No description available.
90

Investigating Ionospheric Parameters Using the Plasma Line Measurements From Incoherent Scatter Radar

Santana, Julio, III 09 August 2012 (has links)
No description available.

Page generated in 0.0676 seconds